JP7058171B2 - Storage type power supply - Google Patents

Description

The present invention relates to a power storage type power supply device capable of supplying stored electric energy to the outside.

Conventionally, various power storage type power supply devices have been proposed to supply the electric energy stored in the power storage devices connected in parallel to the outside. In such a power storage type power supply device, there are cases where it is devised so that a current that is evenly differentiated as much as possible flows through a large number of power storage devices connected in parallel. This is to prevent the charging / discharging current from concentrating on a specific power storage device and shortening its useful life.

In order to even out the current flowing through a large number of power storage devices (capacitors) connected in parallel, a method of providing a slit in a pattern conductor connecting the capacitors in parallel has been proposed (see, for example, Patent Document 1). In the technique of Patent Document 1, the impedance of the conductor portion connecting each capacitor is made uniform by dividing the section of the pattern conductor by a slit. That is, the impedance of the current path to each capacitor is made equal to equalize the current flowing through each capacitor.

On the other hand, in the technique of Patent Document 1, the current is evenly differentiated by the slit only in the direction in which the positive electrode terminal and the negative electrode terminal are lined up, and in the direction orthogonal to the direction in which the positive electrode terminal and the negative electrode terminal are lined up. Has also proposed a method for solving the problem that the above-mentioned leveling is not sufficiently achieved (see, for example, Patent Document 2).

In the technique of Patent Document 2, a plurality of tubular capacitor elements having electrodes at both ends are arranged in the first and second directions intersecting each other, and a first bus bar connecting one electrode of each capacitor element to each other and each capacitor. A second bus bar is provided to connect the other electrodes of the element to each other. A notch (slit) is formed in the first and second bus bars so as to divide each bus bar into two from the center position of each one end thereof to the vicinity of the center of the other end thereof. As a result, each bus bar has a U-shaped planar shape, and variations in bus bar inductance and path resistance with respect to the plurality of capacitor elements arranged in the first and second directions and variations in the amount of heat generated from the bus bar can be reduced. Is said to be possible.

Japanese Unexamined Patent Publication No. 2001-352767 Japanese Unexamined Patent Publication No. 2007-31634

However, in any of the techniques in the above patent documents, the positive electrode side and the negative electrode for connecting each corresponding end of a parallel connection conductor such as a pattern conductor or a bus bar connecting a plurality of power storage devices (capacitors) in parallel to an external circuit. It is said to be each external connection part on the side.
Therefore, when a large current flows through the external connection portion, a voltage drop that cannot be ignored occurs due to the resistance of the parallel connection conductor itself. That is, due to the difference in the distance from the external connection portion of each power storage device connected in parallel, the voltage between both ends of the power storage device is different, so that the current flowing through the power storage device cannot be evenly differentiated. .. For this reason, there is a difference in the life of each power storage device, and as a result, there arises a problem that the useful life of the power storage device is shortened.

The present invention has been made to solve the above-mentioned conventional problems, and the current flowing through the power storage devices connected in parallel in the power storage type power supply device is equalized, and the useful life of the power storage type power supply device is achieved. It is an object of the present invention to provide a power storage type power supply device capable of extending.

The present inventors have found a means for solving the above problems by repeating various studies and simulations, and have completed the present invention.

(1) A power storage type power supply device in which a plurality of power storage devices (for example, a lithium ion capacitor 10 described later) connected in parallel from the first to the nth (n is an integer of 6 or more) are connected in parallel.
Each of the first to the nth power storage devices from one end of the self (for example, one end 31 described later) to the other end (for example, the second end portion 32 of the positive electrode described later). A positive electrode side parallel connecting conductor (for example, a positive electrode side bus bar 30 described later) to which positive electrode terminals (for example, a positive electrode terminal 101 described later) are connected in this order,
Each of the first to the nth power storage devices from one end of the self (for example, one end 41 described later) to the other end (for example, the second negative electrode 42 described later). A negative electrode side parallel connecting conductor (for example, a negative electrode side bus bar 40 described later) to which the negative electrode terminals (for example, the negative electrode terminal 102 described later) are connected in this order is provided.
The positive electrode side parallel connecting conductor has a length corresponding to a resistance value in the range of 20% to 30% of the resistance value from one end to the other end, and the end portion on the first power storage device side. The positive electrode side external connection part is set at a position away from
The negative electrode side parallel connecting conductor has a length corresponding to a resistance value in the range of 20% to 30% of the resistance value from one end to the other end, and the end portion on the nth power storage device side. The negative electrode side external connection part is set at a position away from
Storage type power supply.

In the electricity storage type power supply device of the above (1), a plurality of electricity storage devices from the first to the nth (n is an integer of 6 or more) are connected in parallel by the positive electrode side parallel connection conductor and the negative electrode side parallel connection conductor. Be connected. In the positive electrode side parallel connecting conductor, each positive electrode terminal of the first to the nth power storage device is connected in this order from one end to the other end. In the negative electrode side parallel connection conductor, each negative electrode terminal of the first to the nth power storage device is connected in this order from one end to the other end. The positive electrode side parallel connecting conductor has a length corresponding to a resistance value in the range of 20% to 30% of the resistance value from one end to the other end, and the end portion on the first power storage device side. The positive electrode side external connection portion is set at a position away from the positive electrode side. The negative electrode side parallel connecting conductor has a length corresponding to a resistance value in the range of 20% to 30% of the resistance value from one end to the other end, and the end portion on the nth power storage device side. The negative electrode side external connection portion is set at a position separated from the negative electrode side. By providing the positive electrode side external connection portion and the negative electrode side external connection portion in the positive electrode side parallel connection conductor and the negative electrode side parallel connection conductor at the positions as described above, the positive electrode side external connection portion and the negative electrode side external connection portion are large. When the current flows, the current flowing through each of the power storage devices connected in parallel is evenly differentiated.

(2) A power storage type power supply device in which a plurality of power storage devices (for example, a lithium ion capacitor 10 described later) connected in parallel from the first to the nth (n is an integer of 6 or more) are connected in parallel.
The plurality of power storage devices extend in the parallel direction, and from one end of the self (for example, one end 31 described later) to the other end (for example, the second end 32 of the positive electrode described later), the said. A positive electrode side parallel connecting conductor (for example, a positive electrode side bus bar 30 described later) to which each positive electrode terminal (for example, a positive electrode terminal 101 described later) of the first to the nth power storage device is connected in this order.
From the first end to the other end (for example, the negative electrode second end 42 described later) extending in the parallel direction from one end (for example, one end 41 described later). Each negative electrode terminal (for example, the negative electrode terminal 102 described later) of the nth power storage device is provided with a negative electrode side parallel connecting conductor (for example, a negative electrode side bus bar 40 described later) connected in this order.
In the positive electrode side parallel connection conductor, the positive electrode side external connection portion is set at a position separated from the end portion on the first power storage device side within a range of 20% to 30% of the total length in the longitudinal direction of the positive electrode side.
In the negative electrode side parallel connection conductor, the negative electrode side external connection portion is set at a position separated from the end portion on the nth power storage device side within a range of 20% to 30% of the total length in the longitudinal direction of the conductor.
Storage type power supply.

In the electricity storage type power supply device of the above (2), a plurality of electricity storage devices from the first to the nth (n is an integer of 6 or more) are connected in parallel by the positive electrode side parallel connection conductor and the negative electrode side parallel connection conductor. Be connected. The positive electrode side parallel connecting conductor extends in the parallel direction of the plurality of power storage devices, and from one end of the self to the other end, each positive electrode terminal of the first to the nth power storage devices is provided. Are connected in this order. The negative electrode side parallel connection conductor extends in the parallel direction, and each negative electrode terminal of the first to the nth power storage device is connected in this order from one end to the other end. To. In the positive electrode side parallel connecting conductor, the positive electrode side external connecting portion is set at a position separated from the end portion on the first power storage device side within a range of 20% to 30% of the total length in the longitudinal direction of the positive electrode side. In the negative electrode side parallel connection conductor, the negative electrode side external connection portion is set at a position separated from the end portion on the nth power storage device side within a range of 20% to 30% of the total length in the longitudinal direction of the conductor. By providing the positive electrode side external connection portion and the negative electrode side external connection portion in the positive electrode side parallel connection conductor and the negative electrode side parallel connection conductor at the positions as described above, the positive electrode side external connection portion and the negative electrode side external connection portion are large. When the current flows, the current flowing through each of the power storage devices connected in parallel is evenly differentiated.

(3) The positive electrode side parallel connection conductor has a positive electrode connection conductor portion (for example, a positive electrode connection conductor portion 30a described later) to which each positive electrode terminal of the plurality of power storage devices is connected, and the positive electrode connection conductor portion at a predetermined interval. A positive electrode side external connection conductor portion (for example, a positive electrode side external connection conductor portion 30b described later) which is provided in parallel and is connected to the positive electrode connection conductor portion at a portion corresponding to the positive electrode side external connection portion of the positive electrode connection conductor portion. And have
The negative electrode side parallel connection conductor is provided in parallel with the negative electrode connection conductor portion (for example, the negative electrode connection conductor portion 40a described later) to which the negative electrode terminals of the plurality of power storage devices are connected and the negative electrode connection conductor portion at predetermined intervals. It has a negative electrode side external connection conductor portion (for example, a negative electrode side external connection conductor portion 40b described later) connected to the negative electrode connection conductor portion at a portion of the negative electrode connection conductor portion corresponding to the negative electrode side external connection portion. , The storage type power supply device of the above (1) or (2).

In the electricity storage type power supply device of the above (3), in particular, in the electricity storage type power supply device of the above (1) or (2), the current flows to each of the electricity storage devices connected in parallel by the positive electrode connection conductor portion and the negative electrode connection conductor portion. The current is evenly differentiated. Further, with the load and other external circuits at any of the positive electrode side external connecting conductor portion and the negative electrode side external connecting conductor portion provided in parallel with the positive electrode connecting conductor portion and the negative electrode connecting conductor portion at predetermined intervals, respectively. Even if they are connected, the equalization of the current flowing through each power storage device is not hindered, and the position of external connection is not restricted.

(4) The power storage device is any of the above (1) to (3), which is a lithium ion capacitor or a series connection thereof.

In the storage type power supply device of the above (4), the high temperature durability performance is particularly excellent in any of the storage type power supply devices of the above (1) to (3), and the service life of each power storage device is equalized. The storage type power supply device is realized.

(5) The power storage device is any of the above (1) to (3), which is a secondary battery or a series connection thereof.

In the power storage type power supply device of the above (5), in particular, in any of the power storage type power supply devices of the above (1) to (3), each of the secondary batteries connected in parallel constituting the power storage device or a series connection thereof thereof. A power storage type power supply device is realized in which the charge / discharge currents are evenly distributed and the service life of each power storage device is equalized.

According to the present invention, a power storage type power supply device that is connected in parallel in a power storage type power supply device and that allows the current flowing through the power storage device to be evenly differentiated and to extend the useful life of the power storage type power supply device is realized. can do.

It is an external perspective view which shows one Embodiment of the electricity storage type power supply device of this invention. It is a circuit diagram which shows the general structure of the storage type power supply device of this invention. It is a circuit diagram applied to perform the simulation about the current take-out position about the storage type power supply device of this invention. It is a figure which shows the simulation result when a plurality of parameters are applied to the circuit of FIG. It is an external perspective view which shows the other embodiment of the storage type power supply device of this invention. It is a figure which shows the state which opened the lid body of the power storage type power supply device of FIG. FIG. 5 is an exploded perspective view of the power storage type power supply device of FIG. It is a figure which shows the positive electrode side bus bar and the negative electrode side bus bar of the storage type power supply device of FIG. FIG. 5 is a detailed cross-sectional view of the side surface of the power storage type power supply device of FIG. It is a detailed view of the stacking direction (parallel direction) cross section of the capacitor of the storage type power supply device of FIG. It is a conceptual diagram which shows the serial connection body which connected three storage type power supply devices in series which are substantially the same as the storage type power supply device of FIG. It is a perspective view which shows the schematic structure of the series connection body in FIG. 5 is a conceptual diagram showing a series connection body in which three power storage type power supply devices substantially similar to those of the power storage type power supply devices of FIGS. 5 to 7 are connected in series. It is a perspective view which shows the schematic structure of the series connection body in FIG. 5 is a conceptual diagram showing a series connection body in which three power storage type power supply devices substantially similar to those of the power storage type power supply devices of FIGS. 5 to 7 are connected in series. It is a perspective view which shows the schematic structure of the series connection body in FIG. It is a conceptual diagram which shows the serial connection body which connected three storage type power supply devices in series which are substantially the same as the storage type power supply device of FIG. It is a perspective view which shows the schematic structure of the series connection body in FIG.

Hereinafter, the power storage type power supply device of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an external perspective view showing an embodiment of the power storage type power supply device of the present invention.
FIG. 2 is a circuit diagram showing a general configuration of the power storage type power supply device of the present invention.
The electrical connection relationship in each part of the power storage type power supply device in FIG. 1 is understood by referring to FIG. 2 as appropriate.
In FIG. 1, a plurality of lithium-ion capacitors 10 which are each storage device are arranged in an aligned manner on a base 2, and the plurality of lithium-ion capacitors 10 are connected in parallel to form a storage-type power supply device 1. The internal resistance of each lithium ion capacitor 10 is indicated by "R" in FIG.

Each lithium ion capacitor 10 in this example has a rectangular parallelepiped shape having the same specifications. In FIG. 1, the appearance of the lithium ion capacitor 10 as a single unit is shown above.
Each lithium ion capacitor 10 has a positive electrode terminal 101 and a negative electrode terminal 102 at an upper portion on the opposite side to the bottom portion in contact with the base 2. Each lithium-ion capacitor 10 may take the form of a series-connected body (lithium-ion capacitor module) in which unit lithium-ion capacitors are connected in series inside each of the pieces.

In order to connect the lithium ion capacitors 10 in parallel, a positive electrode side bus bar 30 is provided as a positive electrode side parallel connection conductor for connecting the positive electrode terminals 101 of each lithium ion capacitor 10. Similarly, a negative electrode side bus bar 40 is provided as a negative electrode side parallel connection conductor for connecting the negative electrode terminals 102 of each lithium ion capacitor 10.

The positive electrode side bus bar 30 includes a positive electrode connecting conductor portion 30a to which the positive electrode terminal 101 of each lithium ion capacitor 10 is connected, and a positive electrode side external connecting conductor portion 30b provided in parallel with the positive electrode connecting conductor portion 30a at predetermined intervals. Have.
The positive electrode connection conductor portion 30a of the positive electrode side bus bar 30 is connected to the positive electrode terminal 101 of each lithium ion capacitor 10 between the positive electrode first end portion 31 and the positive electrode second end portion 32.

Specifically, for each connection node 201 of FIG. 2 in which each positive electrode terminal 101 is connected to the positive electrode connection conductor portion 30a (not visible under the positive electrode side bus bar 30 in FIG. 1), resistance between adjacent nodes. Each positive electrode terminal 101 of each lithium ion capacitor 10 is connected to a positive electrode side bus bar 30 (positive electrode connecting conductor portion 30a) at intervals at intervals where the values r become equal (see FIG. 2).

Similar to the above-mentioned positive electrode side bus bar 30, the negative electrode side bus bar 40 is provided in parallel with the negative electrode connecting conductor portion 40a to which the negative electrode terminal 102 of each lithium ion capacitor 10 is connected and the negative electrode connecting conductor portion 40a at predetermined intervals. It also has a negative electrode side external connecting conductor portion 40b.
The negative electrode connection conductor portion 40a of the negative electrode side bus bar 40 is connected to each negative electrode terminal 102 of each lithium ion capacitor 10 between the negative electrode first end portion 41 and the negative electrode second end portion 42.

Specifically, for each connection node 202 of FIG. 2 in which each negative electrode terminal 102 is connected to the negative electrode connection conductor portion 40a (in FIG. 1, it is not visible under the negative electrode side bus bar 40), resistance between adjacent nodes. Each negative electrode terminal 102 of each lithium ion capacitor 10 is connected to the negative electrode side bus bar 40 (negative electrode connecting conductor portion 40a) at intervals at which the values r become equal (see FIG. 2).

The positive electrode connecting conductor portion 30a of the positive electrode side bus bar 30 has a resistance value in the range of 20% to 30% of the resistance value from the positive electrode first end portion 31 to the positive electrode second end portion 32, from the positive electrode first end portion 31. The positive electrode side external connection portion 33 is provided at a separated position. In FIG. 1, the separation distance from the positive electrode first end portion 31 to the positive electrode side external connection portion 33 is referred to as SD.

On the other hand, the negative electrode connecting conductor portion 40a of the negative electrode side bus bar 40 has a resistance value in the range of 20% to 30% of the resistance value from the negative electrode second end portion 42 to the negative electrode first end portion 41, and the negative electrode second end portion. The negative electrode side external connection portion 43 is provided at a position separated from the 42. In FIG. 1, the separation distance from the negative electrode second end portion 42 to the negative electrode side external connection portion 43 is referred to as SD.

In the present embodiment, the positive electrode connecting conductor portion 30a and the negative electrode connecting conductor portion 40a are made of a conductive material having a uniform resistivity and a uniform cross section.
Therefore, since the resistance value r between the connection nodes 201 of FIG. 2 in which the positive electrode terminal 101 of each lithium ion capacitor 10 is connected to the positive electrode connection conductor portion 30a is equal, the physical distance between the connection nodes 201 is equal. Are equal.

Similarly, since the resistance value r between the connection nodes 202 in FIG. 2 in which the negative electrode terminal 102 of each lithium ion capacitor 10 is connected to the negative electrode connection conductor portion 40a is equal, the physical resistance between the connection nodes 202 is equal. The intervals are equal.
Further, in the present embodiment, since a plurality of lithium ion capacitors 10 are arranged on the base 2 so that the physical intervals of the lithium ion capacitors 10 are equal, the above-mentioned separation distance SD is equivalent to Pn by the number of lithium ion capacitors 10. It can also be seen as the separation distance of.

As shown in FIG. 2, the external resistance between the positive electrode side external connection portion 33 and the ground is referred to as RL1, and the external resistance between the negative electrode side external connection portion 43 and the ground is referred to as RL2.

In the storage type power supply device 1 of the present invention, the positions of the positive electrode side external connection portion 33 and the negative electrode side external connection portion 43 are set as described above, so that the current flowing through each lithium ion capacitor 10 is evenly differentiated. Be done. The point at which the current can be evenly differentiated will be described later with reference to the drawings.

The positive electrode connecting conductor portion 30a is connected to the positive electrode side external connecting conductor portion 30b via the above-mentioned positive electrode side external connecting portion 33. Further, the positive electrode side external connecting conductor portion 30b is connected to a load or other external circuit (not shown).

Similarly, the negative electrode connecting conductor portion 40a is connected to the negative electrode side external connecting conductor portion 40b via the negative electrode side external connecting portion 43. Further, the negative electrode side external connecting conductor portion 40b is connected to a load or other external circuit (not shown).

That is, in the present embodiment, the positive electrode connecting conductor portion 30a and the positive electrode side external connecting conductor portion 30b are provided in parallel, and the positive electrode connecting conductor portion 30a and the positive electrode side external connecting conductor portion 30b are provided at the above-mentioned positions. It is connected by the positive electrode side external connecting portion 33.

Similarly, the negative electrode connecting conductor portion 40a and the negative electrode side external connecting conductor portion 40b are provided in parallel, and the negative electrode connecting conductor portion 40a and the negative electrode side external connecting conductor portion 40b are provided at the above-mentioned positions. It is connected by a unit 43.

Therefore, when the positive electrode side external connecting conductor portion 30b and the negative electrode side external connecting conductor portion 40b are connected to a load or other external circuit by a bonding wire or the like (not shown), the positive electrode side external connecting conductor portion 30b and the negative electrode side external Regardless of where the current is exchanged in the connecting conductor portion 40b, the positions of the above-mentioned connection points in the positive electrode connecting conductor portion 30a and the negative electrode connecting conductor portion 40a do not change with respect to the connection with each lithium ion capacitor 10. be. Therefore, the equalization of the current flowing through each lithium ion capacitor 10 is not hindered, and the position of external connection is not restricted.

FIG. 3 is a circuit diagram applied to simulate the characteristics of the power storage type power supply device of the present invention when the number of parallel power storage devices is set as an independent variable and the current extraction position is set as a dependent variable.
In the circuit diagram of FIG. 3, the electric energy stored in the n parallel connections of the lithium ion capacitors 10 (typically 6 in FIG. 3) is transferred to the positive electrode side external connection portion 33 and the negative electrode side. It is configured to be taken out from the external connection unit 43 and supplied to the external circuit (resistors RL1 and RL2). When performing the simulation, the resistance of the external circuit is RL1 = RL2 = 100 μΩ, the current I is taken out is 11000 A, and the maximum and minimum values of the current flowing through the lithium ion capacitor 10 according to the number of parallel connections of the lithium ion capacitor 10 are set. The current extraction position when the difference value ΔIA is the minimum is expressed as the separation distance SD (%) from the end of the connecting conductor portion as described above.
Further, as described above with reference to FIG. 2, the resistance values r between the adjacent nodes for each connection node 201 of the positive electrode connection conductor portion 30a and the positive electrode terminal 101 of the lithium ion capacitor 10 are equal, and the negative electrode connection conductor portion 40a. And each resistance value r between the adjacent nodes relating to each connection node 202 with the negative electrode terminal 102 of the lithium ion capacitor 10 is equal.

FIG. 4 is a diagram showing simulation results for the circuit of FIG.
The characteristic curve in FIG. 4 shows the characteristics when the number n of parallel connections of the lithium ion capacitor 10 is set as the independent variable and the current extraction position (the position represented by SD described above) is set as the dependent variable.
The characteristic curve in FIG. 4 shows r / R = 0.01 and r / R = 0.001 with the ratio r / R of the resistance value r between the adjacent nodes and the internal resistance R of the lithium ion capacitor 10 as parameters. , R / R = 0.0001, r / R = 0.00001, r / R = 0.000001, the maximum number of parallel numbers n of the lithium ion capacitors 10 and the maximum value of the current flowing through the lithium ion capacitors 10. It shows the simulation result of the current extraction position (the position represented by SD described above) at which the difference value ΔIA between the capacitor and the minimum value is the minimum. Note that FIG. 4 shows the simulation results of the resistivity r / R in five ways with different line types. However, the simulation results when the resistivity r / R was 0.0001, 0.00001, and 0.000001 were almost the same as the simulation results when the resistivity r / R was 0.001. In FIG. 4, these four types of simulation results overlap. Specifically, the difference value ΔIA between the maximum value and the minimum value of the current is the current value Imax of the n lithium ion capacitors 10 connected in parallel, which has the maximum discharge current value, and the discharge current value. It is the difference from the current value Imin, which is the minimum.
As described above, the resistance value r between the adjacent nodes 201 and 201 in the positive electrode connecting conductor portion 30a is equal to the resistance value r between the adjacent nodes 202 and 202 in the negative electrode connecting conductor portion 40a.

From the characteristic curve in FIG. 4, when the number n in parallel of the lithium ion capacitor 10 is 6 or more, the current is taken out when the difference value ΔIA between the maximum value and the minimum value of the current flowing through the lithium ion capacitor 10 becomes the minimum. The position SD (the ratio of the distance from the end of the connecting conductor to the current extraction position with respect to the total length of the connecting conductor) is generally within the range of 20% to 30% regardless of the magnitude of the resistance ratio r / R. It is read that

As described above, the power storage type power supply device 1 as the embodiment of the present invention described with reference to the drawings is a lithium ion capacitor 10 which is a plurality of power storage devices from the first to the nth (n is an integer of 6 or more). Is a storage type power supply connected in parallel,
The positive electrode side bus bar 30 (positive electrode connecting conductor portion 30a) connects each positive electrode terminal 101 of the first to nth lithium ion capacitors 10 from the connection node 201 at one end portion 31 to the positive electrode second end portion 32. Connect to the connection node 201 in the above order at intervals where the resistance values r between the connection nodes 201 with the adjacent positive electrode terminals are equal, and the resistance value 20 from one end 31 to the positive electrode second end 32. The positive electrode side external connection portion 33 is set at the position SD separated from one end portion 31 (the end portion 31 on the first lithium ion capacitor 10 side) by the length corresponding to the resistance value in the range of% to 30%. ing.
Further, the negative electrode side bus bar 40 (negative electrode connecting conductor portion 40a) has one of the negative electrode terminals 102 of the lithium ion capacitor 10 which is a plurality of power storage devices from the first to the nth (n is an integer of 6 or more). From the connection node 202 at the end portion 41 of the negative electrode to the connection node 202 at the negative electrode second end portion 42, the connection nodes 202 between the adjacent negative electrode terminals and the connection nodes 202 are connected in the above-mentioned order at intervals where the resistance values r are equal to each other. The length corresponding to the resistance value in the range of 20% to 30% of the resistance value from the end portion 41 to the negative electrode second end portion 42, the negative electrode second end portion 42 (negative electrode on the nth lithium ion capacitor 10 side). The negative electrode side external connection portion 43 is set at the position SD separated from the second end portion 42).

By providing the positive electrode side external connection portion 33 and the negative electrode side external connection portion 43 in the positive electrode side bus bar 30 and the negative electrode side bus bar 40 at the position SD as described above, the positive electrode side external connection portion 33 and the negative electrode side external connection portion 43 are passed through. When a large current flows, the current flowing through each of the lithium ion capacitors 10 connected in parallel is equalized.
Therefore, the aging deterioration of each lithium ion capacitor 10 which is a power storage device becomes substantially equal, and the useful life of the power storage type power supply device can be extended.

Further, in the power storage type power supply device 1 as the embodiment of the present invention, the lithium ion capacitors 10 which are a plurality of power storage devices from the first to the nth (n is an integer of 6 or more) are connected in parallel. It is a type power supply
The positive electrode side bus bar 30 (positive electrode connecting conductor portion 30a) connects each positive electrode terminal 101 of a plurality of lithium ion capacitors 10 from the connection node 201 at one end 31 to the connection node 201 at the second positive end 32, and the like. They are connected at intervals and extend in the parallel direction of the lithium ion capacitor 10, and range from one end 31 (the end 31 on the side of the first lithium ion capacitor 10) to 20% to 30% of the total length in the longitudinal direction of the self. The positive electrode side external connection portion 33 is set at the position SD separated by.
Further, the negative electrode side bus bar 40 (negative electrode connecting conductor portion 40a) connects each negative electrode terminal 102 of the plurality of lithium ion capacitors 10 from the connection node 202 at one end thereof to the connection node at the second negative electrode portion 42. 20% to 30% of the total length in the longitudinal direction of the negative electrode 42 (the second end 42 of the negative electrode on the nth lithium ion capacitor 10 side) connected to 202 at equal intervals and extended in the parallel direction. The negative electrode side external connection portion 43 is set at the position SD separated in the range of.

The positive electrode side external connection portion 33 and the negative electrode side external connection portion 43 in the positive electrode side bus bar 30 (positive electrode connection conductor portion 30a) and the negative electrode side bus bar 40 (negative electrode connection conductor portion 40a) are provided at the positions SD as described above. When a large current flows through the positive electrode side external connection portion 33 and the negative electrode side external connection portion 43, the current flowing through each of the lithium ion capacitors 10 connected in parallel is equalized.
Therefore, the aging deterioration of each lithium ion capacitor 10 which is a power storage device becomes substantially equal, and the useful life of the power storage type power supply device can be extended.

Further, the positive electrode side bus bar 30 is provided in parallel with the positive electrode connecting conductor portion 30a to which each positive electrode terminal 101 of the lithium ion capacitor 10 is connected and the positive electrode connecting conductor portion 30a at predetermined intervals, and is provided on the positive electrode side of the positive electrode connecting conductor portion 30a. It has a positive electrode side external connecting conductor portion 30b connected to the positive electrode connecting conductor portion 30a at a portion corresponding to the external connecting portion 33.
Further, the negative electrode side bus bar 40 is provided in parallel with the negative electrode connecting conductor portion 40a to which each negative electrode terminal 102 of the lithium ion capacitor 10 is connected and the negative electrode connecting conductor portion 40a at predetermined intervals, and the negative electrode side of the negative electrode connecting conductor portion 40a. It has a negative electrode side external connecting conductor portion 40b connected to the negative electrode connecting conductor portion 40a at a portion corresponding to the external connecting portion 43.
Therefore, the positive electrode side bus bar 30 and the negative electrode side bus bar 40 are provided in parallel with the positive electrode connecting conductor portion 30a and the negative electrode connecting conductor portion 40a at predetermined intervals, respectively, of the positive electrode side external connecting conductor portion 30b and the negative electrode side external connecting conductor portion 40b. No matter where the load or other external circuit is connected, the leveling of the current flowing through each lithium ion capacitor 10 is not hindered, and the position of the external connection is not restricted.

Further, in the power storage type power supply device 1 as the embodiment of the present invention, the plurality of power storage devices are lithium ion capacitors or their series connections.
Therefore, the high temperature durability performance is excellent, and the service life of each power storage device is equalized, and as a result, the service life of the power storage device can be extended.

Next, a power storage type power supply device as another embodiment of the present invention will be described.
FIG. 5 is an external perspective view showing another embodiment of the power storage type power supply device of the present invention.
FIG. 6 is a diagram showing a state in which the lid of the power storage type power supply device of FIG. 5 is opened.
In FIGS. 5 and 6, the power storage type power supply device 1a is configured such that a substantially rectangular parallelepiped housing 3 having an open upper portion is sealed by a lid 4.
A plurality of lithium ion capacitors 20 are juxtaposed so as to be laminated along the directions of the side plates 7 and 8 extending in the longitudinal direction in the housing 3.

In FIG. 6, some of the total number of lithium ion capacitors 20 are shown. Each lithium ion capacitor 20 is electrically connected in parallel by a positive electrode side bus bar 50 as a positive electrode side parallel connection conductor and a negative electrode side bus bar 60 as a negative electrode side parallel connection conductor.
As shown in the figure, the positive electrode side bus bar 50 and the negative electrode side bus bar 60 extend substantially in the center of the housing 3 in the width direction along the longitudinal direction, and the first end plate 5 of the housing 3 to the second end plate 5 of the other. Both are arranged so as to be parallel to the end plate 6.
The first end plate 5 of the housing 3 has a positive electrode side external connection terminal portion 501 that is electrically conductive with the positive electrode side bus bar 50 and a negative electrode side external connection terminal portion 502 that is electrically conductive with the negative electrode side bus bar 60. Is provided in the center of the upper side of the first end plate 5.

Similarly, the second end plate 6 of the housing 3 has a positive electrode side external connection terminal portion 503 that is electrically conductive with the positive electrode side bus bar 50 and a negative electrode side external connection terminal portion that is electrically conductive with the negative electrode side bus bar 60. A 504 is provided at the center of the upper side of the second end plate 6.
Although the positive electrode side bus bar 50 and the negative electrode side bus bar 60 are schematically drawn in FIGS. 5 and 6, the details will be described later with reference to FIG.
Hereinafter, the positive electrode side external connection terminal portion 501 is the first external connection terminal, the negative electrode side external connection terminal portion 502 is the second external connection terminal, the positive electrode side external connection terminal portion 503 is the third external connection terminal, and the negative electrode side external connection. The terminal portion 504 is referred to as a fourth external connection terminal.

In the viewpoints of FIGS. 5 and 6, a part of the water jacket 90 constituting the cooler having a thin outer shape is visually recognized so that the bottom plate 9 of the housing 3 overlaps the upper surface of the portion protruding outward of the side plate 7. Will be done. The water jacket 90 is interposed between the upper surface (inner surface) of the bottom plate 9 and the bottom of the lithium ion capacitor 20 in the housing 3 to cool the lithium ion capacitor 20. The water jacket 90 has external pipe connecting portions 91 and 92 that serve as entrances and exits for the cooling fluid, and one of the external pipe connecting portions 91 is visually recognized from the viewpoints of FIGS. 5 and 6.

FIG. 7 is an exploded perspective view of the power storage type power supply device of FIG.
In FIG. 7, the corresponding portions with those of FIGS. 5 and 6 described above are designated by the same reference numerals, and the description of each of them will be omitted as appropriate. Further, also in FIG. 7, the positive electrode side bus bar 50 and the negative electrode side bus bar 60 are schematically drawn as in FIGS. 5 and 6.
In FIG. 7, the external pipe connection portions 91 and 92 of the water jacket 90 are both visually recognized. The water jacket 90 cools each lithium ion capacitor 20 arranged in contact with the upper surface of the water jacket 90 from the bottom thereof by moving the coolant through the external pipe connecting portions 91 and 92 through the flow path provided inside the water jacket 90. ..
Each lithium ion capacitor 20 has a positive electrode terminal 101 and a negative electrode terminal 102, respectively. Also in FIG. 7, some of the total number of lithium ion capacitors 20 are shown.

Between the adjacent lithium ion capacitors 20, a copper plate 21 as a heat equalizing sheet and a heat transfer sheet 22 are arranged over substantially the entire surface of the facing surfaces of the two. The copper plate 21 and the heat transfer sheet 22 are in contact with the water jacket 90 below them. Therefore, the heat generated in the lithium ion capacitor 20 while the storage type power supply device 1a is operating is effectively dissipated from the above-mentioned facing surfaces toward the water jacket 90 through the copper plate 21 and the heat transfer sheet 22.

FIG. 8 is a diagram showing a positive electrode side bus bar and a negative electrode side bus bar of the power storage type power supply device of FIG. As described above with reference to FIG. 6, the positive electrode side bus bar 50 and the negative electrode side bus bar 60 extend substantially in the center of the housing 3 in the width direction along the longitudinal direction as shown in the drawing, and the housing 3 has a positive electrode side bus bar 50 and a negative electrode side bus bar 60. The first end plate 5 to the second end plate 6 are arranged in parallel.
As shown in FIG. 8, the positive electrode side bus bar 50 has a substantially rectangular parallelepiped shape as a whole, and the positive electrode side external connecting conductor portion 50b and the positive electrode side external connecting conductor portion 50b are formed by a slit S formed in the longitudinal direction of the rectangular parallelepiped and partially interrupted. It is divided into a positive electrode connecting conductor portion 50a extending in parallel with the positive electrode side external connecting conductor portion 50b.
One end side of the positive electrode side external connection conductor portion 50b is connected to the above-mentioned first external connection terminal 501, and the other end side is connected to the above-mentioned third external connection terminal 503.
The positive electrode side external connecting conductor portion 50b and the positive electrode connecting conductor portion 50a are connected by the positive electrode side external connecting conductor portion 53. Further, the positive electrode side external connecting conductor portion 53 holds the relative positions of the positive electrode side external connecting conductor portion 50b and the positive electrode connecting conductor portion 50a across the slit S.

In other words, the slit S is divided into a slit portion S1 on the side close to the first external connection terminal 501 and a slit portion S2 on the side close to the third external connection terminal 503 by the positive electrode side external connection portion 53. By dividing the substantially rectangular parallelepiped conductor extending between the first external connection terminal 501 and the third external connection terminal 503 by the slit portion S1 and the slit portion S2 as described above, the positive electrode side extending in parallel The external connecting conductor portion 50b and the positive electrode connecting conductor portion 50a are formed.

As shown in the figure, the slit portion S1 is formed so as to bend from the longitudinal direction to the width direction of the substantially rectangular parallelepiped conductor at the end portion near the first external connection terminal 501. Similarly, the slit portion S2 is formed so as to bend from the longitudinal direction to the width direction of the substantially rectangular parallelepiped conductor at the end portion near the third external connection terminal 503. Therefore, the positive electrode connecting conductor portion 50a has an appearance of being formed by making notches, which are slit portions S1 and S2, in the positive electrode side external connecting conductor portion 50b having a substantially rectangular parallelepiped shape. Therefore, the positive electrode side external connecting conductor portion 50b and the positive electrode connecting conductor portion 50a form a substantially rectangular parallelepiped shape as a whole while being parallel to each other.

Each connection piece 71 for obtaining an electrical connection with each positive electrode terminal 101 (see FIG. 7) of the lithium ion capacitor 20 is in contact with the positive electrode connection conductor portion 50a. Each connection piece 71 stands at a right angle from a first contact plate portion 73 provided with a through hole 72 through which the positive electrode terminal 101 of the lithium ion capacitor 20 penetrates and a bent portion 74 from one end of the first contact plate portion 73. It has a second contact plate portion 75 provided so as to come into contact with the positive electrode connecting conductor portion 50a, and has a substantially L-shape in a side view. A through hole 76 is also formed in the second contact plate portion 75.

One end (the end near the third external connection terminal 503) of the positive electrode connection conductor portion 50a is from the first end 51 of the positive electrode to the other end (the end near the first external connection terminal 501). The connecting pieces 71 are in contact with each other up to the second end 52 of the positive electrode so as to be aligned in the longitudinal direction. The position of each connection piece 71 on the positive electrode connection conductor portion 50a is the position corresponding to each connection node 201 in the circuit diagram of FIG. 2, and the resistances between the connection nodes are equal in r. In the case of this example, the physical spacing between the connection pieces 71 is also the same.
The distance from the positive electrode first end 51 near the third external connection terminal 503 of the positive electrode connection conductor portion 50a to the positive electrode side external connection 53 is the distance SD (number of lithium ion capacitors 20) described above with reference to FIG. Corresponds to Pn).

The configuration of the negative electrode side bus bar 60 is also substantially the same as that of the positive electrode side bus bar 50 described above. Therefore, the negative electrode side bus bar 60 will be briefly described by showing the correspondence relationship with the positive electrode side bus bar 50.
The negative electrode side bus bar 60 is composed of a negative electrode side external connecting conductor portion 60b and a negative electrode connecting conductor portion 60a which are parallel to each other across the slit portions S4 and S3 corresponding to the slit portions S1 and S2 of the slit S described above. The slit S is interrupted at the negative electrode side external connection portion 63 and is divided into slit portions S4 and S3. That is, the negative electrode side external connecting conductor portion 60b and the negative electrode connecting conductor portion 60a are electrically connected by the negative electrode side external connecting portion 63, and the physical relative positions of the two are maintained.
In the negative electrode connecting conductor portion 60a, connection pieces 71 are arranged side by side in the longitudinal direction from the negative electrode first end portion 61 to the negative electrode second end portion 62 on the side not visible in FIG.
The distance from the negative electrode second end 62 near the second external connection terminal 502 of the negative electrode connection conductor portion 60a to the negative electrode side external connection 63 is the distance SD (number of lithium ion capacitors 20) described above with reference to FIG. Corresponds to Pn).

As described above, in the configuration of FIG. 8, the circuit diagram of FIG. 2 will be described in comparison with each other. The positive electrode side bus bar 50 (positive electrode connecting conductor portion 50a) connects each positive electrode terminal 101 of a plurality of lithium ion capacitors 20 from the connection node 201 at the first positive electrode end 51 to the connection node 201 at the second positive electrode 52. Connected at equal intervals and extended in the parallel direction of the lithium ion capacitor 20, from one end 51 (the first end 51 of the positive electrode on the first lithium ion capacitor 20 side) to 20% of the total length in the longitudinal direction of the self. The positive electrode side external connection portion 33 is set at the position SD separated by a range of 30%.
Further, the negative electrode side bus bar 60 (negative electrode connecting conductor portion 60a) connects each negative electrode terminal 102 of the plurality of lithium ion capacitors 20 from the connection node 202 at one end of itself to the connection node 202 at the other end 62. 20% to 30% of the total length in the longitudinal direction of the negative electrode 62 (the second end 62 of the negative electrode on the nth lithium ion capacitor 20 side), which is connected at equal intervals and extends in the parallel direction. The negative electrode side external connection portion 63 is set at the position SD separated by a range.
In the example of FIG. 8, the connection piece 71 corresponds to each of the electrical connection nodes 201 and the connection node 202.

FIG. 9 is a detailed cross-sectional view of the side surface of the power storage type power supply device of FIG.
FIG. 10 is a detailed cross-sectional view of the capacitor in the storage type power supply device of FIG. 5 in the stacking direction (parallel direction).
Strictly speaking, the power storage type power supply devices of FIGS. 9 and 10 are slightly different from those of FIGS. 5 and 6 in terms of the shape of the water jacket 90, the points of one end plate 5 and the other end plate 6, and others. However, they are substantially the same device based on the same design concept.
In FIGS. 9 and 10, the same reference numerals are given to the parts corresponding to those in FIGS. 5 and 6 described above.

As shown in FIG. 9, one end plate 5 of the housing 3 is provided with a pressurizing mechanism 511 by a fluid or an elastic body. The pressurizing mechanism 511 constantly presses the lithium ion capacitors 20 against the lithium ion capacitors 20 in the stacking direction. The other end plate 6 of the housing 3 is also provided with a pressurizing mechanism 611 by an elastic body corresponding to the pressurizing mechanism 511. The other end plate 6 is further provided with a load cell 612 as a pressure sensitive sensor for detecting the pressing force by the pressurizing mechanism 511 and the pressurizing mechanism 611. A servo mechanism (not shown) is operated based on the detection output of the load cell 612, and the pressing force by the pressurizing mechanism 511 and the pressurizing mechanism 611 is appropriately adjusted.
The movable range of the pressurizing mechanism 511 and the pressurizing mechanism 611 themselves is small, and the thickness and the number of sheets are set at appropriate positions such as between the pressing end of the pressurizing mechanism 611 and the side surface of the lithium ion capacitor 20 facing the pressing end. You may choose to sandwich the shim 613. Thereby, the optimization of the arrangement of the lithium ion capacitor 20 and the appropriate pressing by the pressurizing mechanism 511 and the pressurizing mechanism 611 are realized.

With such a configuration, even if a large number of lithium ion capacitors 20 repeatedly expand and contract due to temperature changes during operation, the pressing force in the stacking direction thereof is appropriately maintained, so that the position of the lithium ion capacitors 20 can be maintained. Is held properly. Further, by such a pressing force, heat transfer to the water jacket 90 by the copper plate 21 as the heat equalizing sheet or the heat transfer sheet 22 described with reference to FIG. 7 is appropriately achieved, and the lithium ion capacitor 20 is cooled. The action is maintained.

Further, as shown in FIG. 10, an upper holding member 7a and an upper holding member 8a are provided on the upper portions of the side plate 7 and the side plate 8, respectively. The upper holding member 7a and the upper holding member 8a are provided along the longitudinal direction of the side plate 7 and the side plate 8 over substantially the entire length.
A spring receiving portion 7b and a spring receiving portion 8b are provided on the lower surface of the portion where the upper holding member 7a and the upper holding member 8a project from the upper part of each side plate 7 and the side plate 8 to the inside of the housing 3, respectively. Elastic bodies (coil springs) 23 and 24 are interposed between the spring receiving portions 7b and the spring receiving portions 8b and the set pieces 111 and 112 provided on the upper shoulder portions of the lithium ion capacitor 20. Due to the elastic force of these elastic bodies 23 and 24, the lithium ion capacitor 20 is constantly pressed toward the bottom plate 9 (water jacket 90 on the bottom plate 9) of the housing 3.

Therefore, the lithium ion capacitor 20 is positioned and pressed in the stacking direction (longitudinal direction in the housing 3) by the pressurizing mechanism described with reference to FIG. 9, and also intersects in the stacking direction. Positioning and pressing in the direction is performed. Therefore, the lithium ion capacitor 20 is sufficiently thermally coupled to the water jacket 90 to provide appropriate cooling.

The positive electrode side bus bar 50 and the negative electrode side bus bar 60 as described above are arranged in the direction perpendicular to the paper surface in FIG. 10 above the center of the lithium ion capacitor 20. The positive electrode side bus bar 50 is divided into a positive electrode side external connecting conductor portion 50b and a positive electrode connecting conductor portion 50a by a slit S. Similarly, the negative electrode side bus bar 60 is divided into a negative electrode side external connecting conductor portion 60b and a negative electrode connecting conductor portion 60a by a slit S. The space between the positive electrode side bus bar 50 and the negative electrode side bus bar 60, that is, between the positive electrode side external connecting conductor portion 50b and the negative electrode side external connecting conductor portion 60b is insulated by the insulating member 150.

The second contact plate portion 75 of the connection piece 71 is in contact with the positive electrode connection conductor portion 50a and the negative electrode connection conductor portion 60a, respectively. Further, the first contact plate portion 73 of the connection piece 71 is fastened to the bolt-shaped positive electrode terminal 101 and the negative electrode terminal 102 of the lithium ion capacitor 20 penetrating through the through hole 72 by a nut. As a result, the positive electrode connecting conductor portion 50a and the negative electrode connecting conductor portion 60a separately connect the positive electrode terminal 101 and the negative electrode terminal 102 of the lithium ion capacitor 20 in parallel.

At the bottom of FIG. 10, variations of the connection piece 71 are shown. In these variations, for each of the connection pieces 71a, 71b, 71c, 71d, 71e, their through holes 72, the first contact plate portion 73, the bent portion 74, the second contact plate portion 75, and the through holes 76. It is indicated by adding a, b, c, d, and e to the end of the reference numeral.
As shown in the figure, the connection pieces 71a, 71b, 71c, 71d, 71e have the positions of the through holes 72a, 72b, 72c, 72d, 72e of the first contact plate portions 73a, 73b, 73c, 73d, 73e, respectively. It's different. Further, the connection pieces 71a, 71b, 71c, 71d, 71e have different shapes and positions of the through holes 76a, 76b, 76c, 76d, 76e of the second contact plate portions 75a, 75b, 75c, 75d, 75e, respectively. I have to.
By properly using the connection pieces 71 having such variations according to the order in their arrangement, the positions and dimensions of the positive electrode terminals 101 and the negative electrode terminals 102 of the lithium ion capacitor 20 are displaced due to changes in temperature, and further, in manufacturing. It becomes possible to flexibly respond to the tolerance of.

Also in the storage type power supply device 1a as another embodiment of the present invention described with reference to FIGS. 5 to 10, as described with reference to FIG. 8, the positive electrodes in the positive electrode side bus bar 50 and the negative electrode side bus bar 60 are also used. The side external connection portion 53 and the negative electrode side external connection portion 63 are provided at the position SD as described above. As a result, when a large current flows through the positive electrode side external connection portion 53 and the negative electrode side external connection portion 63, and further through the positive electrode side external connection conductor portion 50b and the negative electrode side external connection conductor portion 60b, they are connected in parallel. The current flowing through each of the lithium ion capacitors 20 is evenly differentiated.
Therefore, the aged deterioration of each lithium ion capacitor 20 which is a power storage device becomes substantially equal, and the useful life of the power storage type power supply device can be extended.

Further, in the power storage type power supply device 1a as another embodiment of the present invention, the lithium ion capacitors 10 which are a plurality of power storage devices from the first to the nth (n is 17 in this embodiment) are connected in parallel. It is a power storage type power supply device
The positive electrode side bus bar 50 (positive electrode connecting conductor portion 50a) connects each positive electrode terminal 101 of a plurality of lithium ion capacitors 20 from the connection node 201 at the first positive electrode end 51 to the connection node 201 at the second positive electrode 52. It is connected at equal intervals and extends in the parallel direction of the lithium ion capacitor 20, and is 20% of the total length in the longitudinal direction of itself from the first end portion 51 of the positive electrode (the first end portion 51 of the positive electrode on the first lithium ion capacitor 20 side). The positive electrode side external connection portion 53 is set at the position SD separated from the above by 30%.
Further, the negative electrode side bus bar 60 (negative electrode connecting conductor portion 60a) connects each negative electrode terminal 102 of the plurality of lithium ion capacitors 20 from the connection node 202 at one end thereof to the connection node at the second negative electrode portion 62. 20% to 30% of the total length in the longitudinal direction of the negative electrode 62 (the second negative electrode 62 on the side of the 17th lithium ion capacitor 20) extending in parallel by connecting to 202 at equal intervals. The negative electrode side external connection portion 63 is set at the position SD separated in the range of.

The positive electrode side external connection portion 53 and the negative electrode side external connection portion 63 in the positive electrode side bus bar 50 (positive electrode connection conductor portion 50a) and the negative electrode side bus bar 60 (negative electrode connection conductor portion 60a) are provided at the positions SD as described above. When a large current flows through the positive electrode side external connection portion 53 and the negative electrode side external connection portion 63, the current flowing through each of the lithium ion capacitors 20 connected in parallel is equalized.
Therefore, the aged deterioration of each lithium ion capacitor 20 which is a power storage device becomes substantially equal, and the useful life of the power storage type power supply device can be extended.

Further, since the positive electrode side bus bar 50 and the negative electrode side bus bar 60 are configured as described with reference to FIG. 8, the positive electrode side external connecting conductor portion 50b and the negative electrode side external connecting conductor portion 60b are electrically connected to each other. Even if it is connected to an external circuit by any of the conductive external terminals (501, 502, 503, 504), the equalization of the current flowing through the lithium ion capacitor 20 is maintained.
For example, it is assumed that the power storage type power supply device 1a is used as one power supply unit, and three of them are connected in series to form a series power supply device. In this case, the first to third power storage type power supply devices 1a are connected in series. The first external connection terminal 501 (or the third external connection terminal 503) of the first storage type power supply device 1a is used as the external connection terminal on the positive electrode side of the series power supply device, and the fourth of the third storage type power supply device 1a. The external connection terminal 504 (or the second external connection terminal 502) is used as the external connection terminal on the negative electrode side of the series power supply device. The fourth external connection terminal 504 (or the second external connection terminal 502) of the first storage type power supply device 1a and the first external connection terminal 501 (or the second external connection terminal 501) of the second storage type power supply device 1a for serial connection. Connect to the third external connection terminal 503). Further, the fourth external connection terminal 504 (or the second external connection terminal 502) of the second storage type power supply device 1a and the first external connection terminal 501 (or the third external connection) of the third storage type power supply device 1a. Connect to terminal 503).
As described above, even when the power storage type power supply device 1a is used as one power supply unit and three of them are connected in series to form a series power supply device, the external terminals (501, 502, 503, 504) are described above. The positive electrode side external connecting conductor portion 50b and the negative electrode side external connecting conductor portion 60b having such a configuration are electrically conductive to the object.
Therefore, even in such a case, the equalization of the current flowing through the lithium ion capacitor 20 is maintained, and the life of the lithium ion capacitor 20 as a component of the series power supply device becomes uniform, so that the service life is extended as a whole.

Further, in the power storage type power supply device 1a as another embodiment of the present invention, the plurality of power storage devices are lithium ion capacitors or a series connection thereof.
Therefore, the high temperature durability performance is excellent, and the service life of each power storage device is equalized, and as a result, the service life of the power storage device can be extended.

The present invention is not limited to the above embodiment, and modifications, improvements, and the like to the extent that the object of the present invention can be achieved are included in the present invention.
For example, the plurality of power storage devices described above are not necessarily limited to lithium ion capacitors, and may be, for example, a secondary battery or a series connection thereof.
In this case as well, the charge / discharge currents of each of the parallel-connected secondary batteries or their series-connected secondary batteries constituting the power storage device are equalized, and the service life of each power storage device is equalized, resulting in power storage. The service life of the power supply system can be extended.

In the above, the case where one storage type power supply device is configured by connecting lithium ion capacitors in parallel has been described in detail.
Next, a technique for connecting a plurality of power storage type power supply devices configured as described above in series will be described.

FIG. 11 is a conceptual diagram showing a series connection body in which three power storage type power supply devices substantially similar to those described with reference to FIG. 1 are connected in series.
FIG. 12 is a perspective view showing a schematic configuration of the series connection body in FIG.
In FIGS. 11 and 12, the three storage type power supply devices 1-1, 1-2, and 1-3 constituting the first series connection body 11S respectively connect a plurality of lithium ion capacitors 10 and them in parallel. It has a positive electrode side bus bar 30 (30-1, 30-2, 30-3) and a negative electrode side bus bar 40 (40-1, 40-2, 40-3).

The positive electrode side bus bar 30 is common in that the positive electrode connecting conductor portion 30a and the positive electrode side external connecting conductor portion 30b arranged in parallel like the positive electrode side bus bar 30 in FIG. 1 are connected by the positive electrode side external connecting portion 33. There is. In the case of FIG. 12, in order to connect the three storage type power supply devices 1-1, 1-2 and 1-3 in series, the position of the positive electrode side external connection portion 33 of the positive electrode side bus bar 30 is at any end. Two types are used depending on whether they are close to each other. That is, in the first type, the position of the positive electrode side external connection portion 33 is to the right of the center of the positive electrode side bus bar 30 in the longitudinal direction in the viewpoint of FIG. In the second type, the position of the positive electrode side external connection portion 33 is to the left of the center of the positive electrode side bus bar 30 in the longitudinal direction in the viewpoint of FIG. The first type corresponds to the first positive electrode side bus bar 30-1 and the second positive electrode side bus bar 30-3, and the second type corresponds to the third positive electrode side bus bar 30-2.
Referring to both FIGS. 12 and 1, in the positive electrode side bus bar 30 of the first type, the separation distance SD from the positive electrode first end portion 31 to the positive electrode side external connection portion 33 is the positive electrode first on the right side in FIG. It is set as seen as the end 31 side. Further, in the second type positive electrode side bus bar 30, the separation distance SD from the positive electrode first end portion 31 to the positive electrode side external connection portion 33 is set with the left side in FIG. 12 as the positive electrode first end portion 31 side. ..

The negative electrode side bus bar 40 is also common in that the negative electrode connecting conductor portion 40a and the negative electrode external connecting conductor portion 40b arranged in parallel are connected by the negative electrode side external connecting portion 43 as in the negative electrode side bus bar 40 in FIG. .. In the case of FIG. 12, in order to connect the three storage type power supply devices 1-1, 1-2 and 1-3 in series, the position of the negative electrode side external connection portion 43 of the negative electrode side bus bar 40 is at any end. Two types are used depending on whether they are close to each other. That is, in the first type, the position of the negative electrode side external connection portion 43 is to the left of the center of the negative electrode side bus bar 40 in the longitudinal direction in the viewpoint of FIG. In the second type, the position of the negative electrode side external connection portion 43 is to the right of the center of the negative electrode side bus bar 40 in the longitudinal direction in the viewpoint of FIG. The first type corresponds to the first negative electrode side bus bar 40-1 and the second negative electrode side bus bar 40-3, and the second type corresponds to the third negative electrode side bus bar 40-2.
Regarding the negative electrode side bus bar 40 as well, with reference to FIGS. 12 and 1, in the negative electrode side bus bar 40 of the first type, the separation distance SD from the negative electrode first end portion 41 to the negative electrode side external connection portion 43 is shown in FIG. The left side of No. 12 is set as the negative electrode first end 41 side. Further, in the second type negative electrode side bus bar 40, the separation distance SD from the negative electrode first end portion 41 to the negative electrode side external connection portion 43 is set with the right side in FIG. 12 as the negative electrode first end portion 41 side. ..

The first positive electrode side bus bar 30-1 and the first negative electrode side bus bar 40-1 are conductors that connect the lithium ion capacitors 10 of the storage type power supply device 1-1 in parallel. Further, the third positive electrode side bus bar 30-2 and the third negative electrode side bus bar 40-2 are conductors connecting the lithium ion capacitors 10 of the storage type power supply device 1-2 in parallel. Further, the second positive electrode side bus bar 30-3 and the second negative electrode side bus bar 40-3 are conductors connecting the lithium ion capacitors 10 of the storage type power supply device 1-3 in parallel.

The first negative electrode side bus bar 40-1 of the storage type power supply device 1-1 and the third positive electrode side bus bar 30-2 of the storage type power supply device 1-2 are connected by the first connecting connection conductor 11a, and the storage type power supply device The third negative electrode side bus bar 40-2 of 1-2 and the second positive electrode side bus bar 30-3 of the storage type power supply device 1-3 are connected by a second connecting conductor 11b. Further, in the first series connection body 11S, the positive electrode side output conductor 11p is derived from the first positive electrode side bus bar 30-1 of the storage type power supply device 1-1, and the second negative electrode side bus bar 40 of the storage type power supply device 1-3. The negative electrode side output conductor 11n is derived from -3.
In the first series connection body 11S, the storage type power supply devices 1-1, 1-2 and 1-3 are connected in series by the first connection connection conductor 11a and the second connection connection conductor 11b.

In the first series connection body 11S, the first connection conductor 11a is a portion corresponding to the negative electrode side external connection portion 43 in the first negative electrode side bus bar 40-1, and the positive electrode side outside in the third positive electrode side bus bar 30-2. It is provided between the portion corresponding to the connecting portion 33. Similarly, the second connecting conductor 11b corresponds to the portion corresponding to the negative electrode side external connecting portion 43 in the third negative electrode side bus bar 40-2 and the positive electrode side external connecting portion 33 in the second positive electrode side bus bar 30-3. It is provided between the part to be used.
Further, the positive electrode side output conductor 11p is provided at a portion of the first positive electrode side bus bar 30-1 corresponding to the positive electrode side external connection portion 33. Further, the negative electrode side output conductor 11n is provided at a portion of the second negative electrode side bus bar 40-3 corresponding to the negative electrode side external connection portion 43.

In the first series connection 11S of FIGS. 11 and 12, the positive electrode side bus bar 30 is of the first type, the first positive electrode side bus bar 30-1, the second positive electrode side bus bar 30-3, and the second type. The third positive electrode side bus bar 30-2 is arranged as described above. Further, as the negative electrode side bus bar 40, the first type first negative electrode side bus bar 40-1, the second negative electrode side bus bar 40-3, and the second type third negative electrode side bus bar 40-2 are as described above. Is placed in. According to these arrangements, the first connecting conductor 11a connects the portion corresponding to the positive electrode side external connection portion 33 of the positive electrode side bus bar 30 and the portion corresponding to the negative electrode side external connection portion 43 of the negative electrode side bus bar 40. , A second connecting conductor 11b is provided. As a result, as described with reference to FIGS. 1 to 4, the currents of the lithium ion capacitors 10 constituting the power storage type power supply devices 1-1, 1-2, and 1-3 can be evenly distributed. Therefore, the aging deterioration of each lithium ion capacitor 10 becomes substantially equal, and the useful life of the power storage type power supply device can be extended. Further, the three power storage type power supply devices 1-1, 1-2 and 1-3 are connected by the first connecting conductor 11a and the second connecting conductor 11b in the shortest path while maintaining the above-mentioned effects. It is connected in series, which is advantageous for miniaturization, weight reduction, and suppression of power loss.

FIG. 13 is a conceptual diagram showing a series connection body in which three power storage type power supply devices substantially similar to those described with reference to FIGS. 5 to 7 are connected in series.
FIG. 14 is a perspective view showing a schematic configuration of the series connection body in FIG.
In FIGS. 13 and 14, the three storage-type power supply devices 1a-1, 1a-2, and 1a-3 constituting the series connection have a plurality of lithium ion capacitors 20 (see FIG. 6 for details), respectively. It is configured to have a positive electrode side bus bar 50 (50-1, 50-2, 50-3) and a negative electrode side bus bar 60 (60-1, 60-2, 60-3) connecting them in parallel. The positive electrode side bus bar 50 and the negative electrode side bus bar 60 are substantially the same as the bus bar described with reference to FIG. That is, in the positive electrode side bus bar 50, the positive electrode side connecting conductor portion 50a and the positive electrode side external connecting conductor portion 50b are connected by the positive electrode side external connecting portion 53. Further, in the negative electrode side bus bar 60, the negative electrode side connecting conductor portion 60a and the negative electrode side external connecting conductor portion 60b are connected by the negative electrode side external connecting portion 63.

The end of the fourth positive electrode side bus bar 50-1 in the storage type power supply device 1a-1 that is relatively close to the positive electrode side external connection portion 53, and the fifth negative electrode side bus bar 60-2 in the storage type power supply device 1a-2. The end portion relatively close to the negative electrode side external connecting portion 63 is connected by the third connecting connecting conductor 13a. Further, the end of the fifth positive electrode side bus bar 50-2 in the storage type power supply device 1a-2 that is relatively close to the positive electrode side external connection portion 53 and the sixth negative electrode side bus bar 60 in the storage type power supply device 1a-2. The end portion of -3 that is relatively close to the negative electrode side external connecting portion 63 is connected by the connecting conductor 13b.
In the form as described above, the storage type power supply devices 1a-1, 1a-2 and 1a-3 are connected in series by the third connection connection conductor 13a and the fourth connection connection conductor 13b to form a storage type power supply device. A second series connection body 13S in which three units are connected in series is configured. In this state, the negative electrode side output conductor 13n from the end relatively close to the negative electrode side external connection portion 63 of the negative electrode side external connection conductor portion 60b in the fourth negative electrode side bus bar 60-1 of the storage type power supply device 1a-1. Is derived. Further, the positive electrode side output conductor 13p is derived from the end portion of the positive electrode side external connection conductor portion 50b of the sixth positive electrode side bus bar 50-3 of the storage type power supply device 1a-3 that is relatively close to the positive electrode side external connection portion 53. Will be done.

An example of the appearance of the second series connection body 13S conceptually shown in FIG. 13 is shown in the perspective view of FIG.
As described above, the storage-type power supply devices 1a-1, 1a-2, and 1a-3 constituting the second series connection 13S are substantially the same as the storage-type power supply devices described with reference to FIGS. 5 to 7. It has a first external connection terminal 501 and a third external connection terminal 503 as positive electrode terminals, and a second external connection terminal 502 and a fourth external connection terminal 504 as negative electrode terminals.
The third connection conductor 13a described above with reference to FIG. 13 is located between the first external connection terminal 501 of the power storage type power supply device 1a-1 and the second external connection terminal 502 of the power storage type power supply device 1a-2. It is connected so as to connect. Further, the fourth connection conductor 13b is connected so as to connect the third external connection terminal 503 of the power storage type power supply device 1a-2 and the fourth external connection terminal 504 of the power storage type power supply device 1a-3. To. Further, the negative electrode side output conductor 13n is connected to the fourth external connection terminal 504 of the storage type power supply device 1a-1, and the positive electrode side output conductor 13p is connected to the first external connection terminal 501 of the storage type power supply device 1a-3. ..
In order to form the second series connection body 13S by connecting the storage type power supply devices 1a-1, 1a-2 and 1a-3 in series in the manner as described with reference to FIGS. 13 and 14, a third connection is made. The connecting conductor 13a and the fourth connecting conductor 13b are the shortest, which is advantageous in reducing the size, reducing the weight, and suppressing the loss of electric power. Further, as in the first series connection 11S described with reference to FIGS. 11 and 12, the equalization of the current flowing through the lithium ion capacitor 20 is maintained, and the life of the lithium ion capacitor 20 as a component of the series power supply device is maintained. As a result, the useful life is extended as a whole.

FIG. 15 is a conceptual diagram showing a series connection body in which three power storage type power supply devices substantially similar to those described with reference to FIGS. 5 to 7 are connected in series.
FIG. 16 is a perspective view showing a schematic configuration of the series connection body in FIG.
In FIGS. 15 and 16, one difference between the third series connection body 15S and the second series connection body 13S described above with reference to FIGS. 13 and 14 is the negative electrode side output conductor 13n and the positive electrode side. This is the lead-out position with the output conductor 13p. That is, in the second series connection body 13S, the lead-out position of the negative electrode side output conductor 13n and the positive electrode side output conductor 13p was on the opposite side in the longitudinal direction of the storage type power supply devices 1a-1, 1a-2 and 1a-3. However, in the third series connection body 15S, the lead-out positions of the negative electrode side output conductor 15n and the positive electrode side output conductor 15p are on the same side in the longitudinal direction of the storage type power supply devices 1a-1, 1a-2 and 1a-3. Along with this, in the third series connection body 15S, the connection of the fifth connection connection conductor 15a and the sixth connection connection conductor 15b for connecting the storage type power supply devices 1a-1, 1a-2 and 1a-3 in series. Is also performed on the same side in the longitudinal direction of the storage type power supply devices 1a-1, 1a-2 and 1a-3.
In FIGS. 15 and 16, the corresponding parts of FIGS. 13 and 14 are designated by the same reference numerals, and the above description is incorporated.

In FIG. 15, the storage type power supply device 1a-1 has a negative electrode side bus bar 60e-1 and a fourth positive electrode side bus bar 50-1, and the negative electrode side external connection conductor portion 60b of the negative electrode side bus bar 60e-1 is connected to the negative electrode side externally. The negative electrode side output conductor 15n is derived from the end portion on the side relatively distant from the portion 63. Further, the storage type power supply device 1a-3 has a sixth negative electrode side bus bar 60-3 and a positive electrode side bus bar 50e-3, and is used as a positive electrode side external connection portion 53 of the positive electrode side external connection conductor portion 50b in the positive electrode side bus bar 50e-3. The positive electrode side output conductor 15p is derived from the end on the relatively close side.

In the examples of FIGS. 15 and 16, the fourth positive electrode side bus bar 50-1 of the storage type power supply device 1a-1 and the fifth negative electrode side bus bar 60-2 of the storage type power supply device 1a-2 are connected to the positive electrode side external connection portion. The end portion on the side relatively close to the negative electrode side external connecting portion 63 and the negative electrode side external connecting portion 63 is connected by the fifth connecting connecting conductor 15a. On the other hand, the fifth positive electrode side bus bar 50-2 of the storage type power supply device 1a-2 and the sixth negative electrode side bus bar 60-3 of the storage type power supply device 1a-3 are the positive electrode side external connection portion 53 and the negative electrode side outside. The end portion on the side relatively far from the connecting portion 63 is connected by the sixth connecting connecting conductor 15b. However, since the connection by the fifth connecting conductor 15a and the sixth connecting conductor 15b is performed by the external connecting conductor portion (positive electrode side external connecting conductor portion 50b, negative electrode side external connecting conductor portion 60b), the connection is performed. As in the above-mentioned example, the current equalization of the lithium ion capacitors connected in parallel is not hindered, and the life of the lithium ion capacitor 20 as a component of the series power supply device is equalized, so that the service life is extended as a whole. Will be done.
Further, the fifth connecting conductor 15a and the sixth connecting conductor 15b are the shortest, which is advantageous in reducing the size, reducing the weight, and suppressing the loss of electric power.

FIG. 17 is a conceptual diagram showing a series connection body in which three storage-type power supply devices, which are substantially the same as those of the storage-type power supply device described with reference to FIG. 1, are connected in series. Each lithium ion capacitor in FIG. 17 is substantially the same as that in FIG. 7.
FIG. 18 is a perspective view showing a schematic configuration of the series connection body in FIG.
In FIGS. 17 and 18, the three storage type power supply devices 1-1, 1-2, and 1-3 constituting the fourth series connection body 17S have a plurality of lithium ion capacitors 20 connected in parallel by bus bars, respectively. It is composed of. Each lithium ion capacitor 20 has a positive electrode terminal 101 and a negative electrode terminal 102, respectively.

A connection piece 71 is individually provided corresponding to the negative electrode terminal 102 of each lithium ion capacitor 20 of the storage type power supply device 1-1. The negative electrode terminal 102 of each lithium ion capacitor 20 and the negative electrode connection conductor portion 60a of the fourth negative electrode side bus bar 60-1 are connected by these connection pieces 71. Each positive electrode terminal 101 of each lithium ion capacitor 20 in the storage type power supply device 1-1 is connected to a plate-shaped bus bar 80-1.
The negative electrode terminal 102 of each lithium ion capacitor 20 in the storage type power supply device 1-2 is connected to the plate-shaped bus bar 80-1. Each positive electrode terminal 101 of each lithium ion capacitor 20 in the storage type power supply device 1-2 is connected to a plate-shaped bus bar 80-2.
The negative electrode terminal 102 of each lithium ion capacitor 20 in the storage type power supply device 1-3 is connected to the plate-shaped bus bar 80-2. The positive electrode terminal 101 of each lithium ion capacitor 20 in the storage type power supply device 1-3 is a connection piece (in the viewpoint of FIG. 18) like the negative electrode terminal 102 of each lithium ion capacitor 20 of the storage type power supply device 1-1 described above. It is connected to the positive electrode connecting conductor portion 50a of the sixth positive electrode side bus bar 50-3 by (not visible).

In the fourth series connection body 17S of FIGS. 17 and 18, three storage type power supply devices 1-1, 1-2 and 1-3 are connected in series by the plate-shaped bus bars 80-1 and 80-2. .. That is, the plate-shaped bus bar 80-1 connects the positive electrode terminals 101 of each lithium ion capacitor 20 of the storage type power supply device 1-1 in parallel, and also connects the storage type power supply device 1-1 and the storage type power supply device 1-2. It functions as a connecting conductor that connects in series by the shortest route. Further, the plate-shaped bus bar 80-2 connects the positive electrode terminals 101 of each lithium ion capacitor 20 of the storage type power supply device 1-2 in parallel, and also connects the storage type power supply device 1-2 and the storage type power supply device 1-3. It functions as a connecting conductor that connects in series by the shortest route.

The negative electrode side output conductor 13n is derived from the end portion of the negative electrode side external connecting conductor portion 60b of the fourth negative electrode side bus bar 60-1 that is relatively close to the negative electrode side external connecting conductor portion 63. Further, the positive electrode side output conductor 13p is derived from the end portion of the sixth positive electrode side bus bar 50-3 on the side relatively close to the positive electrode side external connection portion 53 of the positive electrode side external connection conductor portion 50b.

Also in the fourth series connection body 17S of FIGS. 17 and 18, the plate-shaped bus bars 80-1 and 80-2, which are connection conductors, are the shortest, which is advantageous for miniaturization, weight reduction, and suppression of power loss. Is. Further, as in the first series connection 11S described with reference to FIGS. 11 and 12, the equalization of the current flowing through the lithium ion capacitor 20 is maintained, and the life of the lithium ion capacitor 20 as a component of the series power supply device is extended. Due to the equality, the useful life is extended as a whole.

1,1a, 1-1,1-2,1-3,1a-1,1a-2,1a-3 ... Storage type power supply device 2,9 ... Base 10,20 ... Lithium ion capacitor (power storage device)
11a, 11b, 13a, 13b, 15a, 15b ... Connection conductors 11S, 13S, 15S, 17S ... Series connectors 13n, 15n ... Negative electrode side output conductors 13p, 15p ... Positive electrode side output conductors 30, 50 ... Positive electrode side bus bar (positive electrode side) Side parallel connection conductor)
30a, 50a ... Positive electrode connection conductor portion 30b, 50b ... Positive electrode side external connection conductor portion 31,51 ... Positive electrode first end portion 32, 52 ... Positive electrode second end portion 33, 53 ... Positive electrode side external connection portion 40, 60 ... Negative electrode Side bus bar (negative electrode side parallel connection conductor)
40a, 60a ... Negative electrode connection conductor portion 40b, 60b ... Negative electrode side external connection conductor portion 41, 61 ... Negative electrode first end portion 42, 62 ... Negative electrode second end portion 43, 63 ... Negative electrode side external connection portion 80-1, 80 -2 ... Plate-shaped bus bar 101 ... Positive electrode terminal 102 ... Negative electrode terminal 201, 201 ... Connection node

Claims (5)

It is a power storage type power supply device in which a plurality of power storage devices from the first to the nth (n is an integer of 6 or more) are connected in parallel.
From one end of the self to the other end, a positive electrode side parallel connection conductor in which the positive electrode terminals of the first to the nth power storage devices are connected in this order,
From one end of the self to the other end, each negative electrode terminal of the first to the nth power storage device is provided with a negative electrode side parallel connection conductor connected in this order.
The positive electrode side parallel connecting conductor has a length corresponding to a resistance value in the range of 20% to 30% of the resistance value from one end to the other end, and the end portion on the first power storage device side. A single positive electrode side external connection is set at a position away from
The negative electrode side parallel connecting conductor has a length corresponding to a resistance value in the range of 20% to 30% of the resistance value from one end to the other end, and the end portion on the nth power storage device side. A single negative electrode side external connection is set at a position away from the
Storage type power supply. It is a power storage type power supply device in which a plurality of power storage devices from the first to the nth (n is an integer of 6 or more) are connected in parallel.
The positive electrode side parallel extending in the parallel direction of the plurality of power storage devices and connecting the positive electrode terminals of the first to the nth power storage devices in this order from one end to the other end of the self. With connecting conductors
A negative electrode side parallel connection conductor extending in the parallel direction and connecting the negative electrode terminals of the first to the nth power storage devices in this order from one end to the other end is provided. ,
In the positive electrode side parallel connection conductor, a single positive electrode side external connection portion is set at a position separated from the end portion on the first power storage device side within a range of 20% to 30% of the total length in the longitudinal direction of the conductor. ,
In the negative electrode side parallel connection conductor, a single negative electrode side external connection portion is set at a position separated from the end portion on the nth power storage device side within a range of 20% to 30% of the total length in the longitudinal direction of the conductor. ing,
Storage type power supply. The positive electrode side parallel connecting conductor is provided in parallel with the positive electrode connecting conductor portion to which the positive electrode terminals of the plurality of power storage devices are connected and the positive electrode connecting conductor portion at predetermined intervals, and the positive electrode side of the positive electrode connecting conductor portion. It has a positive electrode side external connecting conductor portion connected to the positive electrode connecting conductor portion at a portion corresponding to the external connecting portion.
The negative electrode side parallel connecting conductor is provided in parallel with the negative electrode connecting conductor portion to which the negative electrode terminals of the plurality of power storage devices are connected and the negative electrode connecting conductor portion at predetermined intervals, and the negative electrode side of the negative electrode connecting conductor portion. The power storage type power supply device according to claim 1 or 2, further comprising a negative electrode side external connection conductor portion connected to the negative electrode connection conductor portion at a portion corresponding to the external connection portion. The power storage device according to any one of claims 1 to 3, wherein the power storage device is a lithium ion capacitor or a series connection thereof. The power storage device according to any one of claims 1 to 3, wherein the power storage device is a secondary battery or a series connection thereof.

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