JPH07240351A - Electrolytic capacitor - Google Patents

Abstract

PURPOSE:To provide an electrolytic capacitor, which can make problems concerned in a reduction in an inductance solve by a new laminated structure and production technique, which are superior in both characteristics and productivity, to a product which is requested a reduction in an impedance in its high- frequency region. CONSTITUTION:An electrolytic capacitor is one manufactured into a structure, wherein a capacitor element 24 is constituted by laminating anode foils 21 and cathode foils 22 in a plurality of steps making electrolyte layers 23 interpose between the foils 21 and 22 in such a way that terminal parts 21a of each anode foil 21 and terminal parts 22a of each cathode foil 22 respectively come to a position on the opposite side of each one and in such a way that the intervals between the parts 21a of each anode foil 21 and the intervals between the parts 22a of each cathode foil 22 are respectively shifted in order at an equal interval and one piece of an external terminal 25a and one piece of an external terminal 25b are respectively connected with the parts 21a of a plurality of pieces of the foils 21 of this element 24 and the parts 22a of a plurality of pieces of the foils 22 of the element 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic capacitor used in various electronic devices.

[0002]

2. Description of the Related Art In recent years, with the increase in frequency of power supply circuits of electronic equipment, excellent high frequency characteristics (impedance characteristics) are required for all electronic components. Electrolytic capacitors are no exception, and in order to achieve this,
The surface condition of the anode, the method of forming an oxide film, the improvement of the electrolyte layer, the surface condition of the cathode, the structure of the capacitor element, etc. have been studied and improved from all angles.

Aluminum electrolytic capacitors having a large electrostatic capacity per unit volume are typical of them, but as shown in FIG. 10, most of them are not suitable for productivity due to the manufacturing method. For the reason, a structure is adopted in which the anode foil 1 and the cathode foil 2 whose surface area is substantially increased by roughening are wound with the separator 3 in between. In order to improve the impedance in the high frequency region, great efforts are being made to improve the electrolyte layer 4 carried on the separator 3 (to lower the resistance), but in addition, the electrode foil is a long product and the capacitance is large. In large products, the inductance affects from a relatively low frequency range depending on the structure of the element.
Depending on the application to be used in the high frequency region, it was necessary to improve the inductance to some extent.

As one of the improvements, there is a case where a method of providing a plurality of terminal portions on a long electrode foil is taken. However, since this method involves complicated connection between the drawn terminal portions,
Not a little loses productivity.

Further, as a method of suppressing the inductance by shortening the length of the electrode foil, for example, Japanese Patent Laid-Open No. 58-17082.
Although a laminated structure of short foils as disclosed in Japanese Patent No. 6 is also conceivable, this is also because the electrode foil is a valve metal and is formed on its surface in order to reliably secure the connection between the layers. Since the easy oxide film is a strong insulator, it has a very difficult connection method problem.

On the other hand, a solid electrolytic capacitor using aluminum or tantalum as an anode material and manganese dioxide or lead dioxide which is an inorganic solid electrolyte as an electrolyte is
As shown in FIGS. 11 (a) and 11 (b), most of them are provided with the internal terminal portions 11a due to the restrictions on the manufacturing method, and the anode foil or the anode plate 11 having the substantial surface area increased by roughening, or A structure in which the cathode layer 14 is formed of carbon, a conductive adhesive or the like after baking the solid electrolyte 13 on the anode body 12 including the internal terminal portion 12a and sintering fine powder by utilizing a thermal decomposition reaction It is adopted. These electrolytes have the advantages of lower temperature dependence and lower resistance in the high frequency region than the aluminum electrolytic capacitors mentioned above, but on the other hand, they have low withstand voltage and are limited by the production method. It also has some disadvantages.

Further, in pursuit of lower resistance of the solid electrolyte, TCNQ which is a charge transfer complex is used.
Commonly used organic semiconductor capacitors that use salts, functional polymer capacitors that use commonly known conductive polymers obtained by polymerizing heterocyclic compounds such as pyrrole, thiophene, and furan have been put to practical use.

However, with respect to these electrolytic capacitors, the improvement of the reduction in inductance related to the structure is only within the above-mentioned category of improvement of the aluminum electrolytic capacitors.

[0009]

A winding type electrolytic capacitor using the most general electrode foil is, as shown in FIG.
Internal terminal portion 5 attached using a method such as caulking
The anode foil 1 and the cathode foil 2 having the above are opposed to each other with the separator 3 interposed therebetween, and these are wound around the core, and then the core is wiped off, and then the separator 3 is loaded with the driving electrolytic solution or the electrolyte layer 4. By doing so, the capacitor element 6 is configured.

In this method, equipment having relatively low cost and extremely excellent mass productivity has already been developed and put into practical use, and it is a standard production form of an electrolytic capacitor using the current valve metal foil as an electrode. Can be said.

However, even in the products manufactured by this excellent structure and construction method, there are some serious problems to meet the rapid demand for improvement of the high frequency region characteristics accompanying the high frequency of the power source in electronic devices in recent years. It is necessary to overcome. In addition, downsizing and weight saving of electronic devices
Considering the demands for thinning and surface mounting, various changes in materials, construction methods, structures, etc. are necessary to meet these diverse demands. Therefore, regarding the items that are particularly important among the items required for a certain application, it is in a state of responding with improved products and countermeasures that can respond to those important items as much as possible. As a result, the above-mentioned excellent productivity is hampered to some extent.

Even for products having low impedance in a high frequency region, a plurality of problems such as surface mount products having low profile and low impedance are often imposed because of the trend toward thinning of equipment. It is well known that, in principle, it is possible to meet such a demand by adopting a structure in which electrode foils of capacitor elements are laminated. However, regarding the actual structure and construction method, the physical properties of the electrode foil, which is a valve metal,
It is difficult to easily establish an excellent manufacturing method when considering the structure and productivity that can be practically used as a product.
Under such circumstances, the advent of structures, construction methods, and manufacturing methods that can withstand mass production is one of the important concerns for both manufacturers and equipment designers.

The present invention provides an electrolytic capacitor which can solve the problems relating to the reduction of the inductance of a product which is required to have a low impedance in a high frequency region, by a new structure and a production method having excellent characteristics and productivity. The purpose is.

[0014]

In order to achieve the above object, an electrolytic capacitor of the present invention is provided with an anode foil and a cathode foil having a terminal portion protruding outward from an end face, and between the anode foil and the cathode foil. With an intervening electrolyte layer, so that the terminal portion of the anode foil and the terminal portion of the cathode foil are located at opposite sides, and between the terminal portions of the anode foil and between the terminal portions of the cathode foil, etc. A capacitor element is formed by stacking a plurality of layers of an anode foil and a cathode foil with an electrolyte layer interposed between them so that they are sequentially displaced at intervals, and a plurality of anode foil terminal portions and a plurality of anode foils in this capacitor element are formed. In this structure, one external terminal is connected to each terminal portion of the cathode foil.

[0015]

According to the above electrolytic capacitor, the anode foil has the anode foil and the cathode foil having the terminal portion protruding outward from the end face, and the electrolyte layer interposed between the anode foil and the cathode foil. Of the anode foil and the cathode foil so that the terminals of the cathode foil and the terminals of the cathode foil are on opposite sides, and the terminals of the anode foil and the terminals of the cathode foil are sequentially displaced at equal intervals. Since the capacitor element is configured by stacking multiple layers with an electrolyte layer interposed between them, the capacitor element that has been stacked is positioned outward from the end faces of the anode foil and cathode foil on both the anode and cathode sides. The protruding terminal parts will be lined up in a straight line in an oblique direction,
As a result, it is possible to securely connect a plurality of anode foils and cathode foils, which are separated from each other, and a plurality of anode foil terminals, and a plurality of cathode foil terminals and external terminals. Therefore, highly reliable connection is possible and the construction method can be simplified. Further, since this electrolytic capacitor is a laminated type, it has a low impedance even in a high frequency region, and it is possible to obtain an electrolytic capacitor having a laminated structure which is low in height and can be surface-mounted with high productivity. .

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 (a), 1 (b) and 1 (c) show an electrolytic capacitor according to an embodiment of the present invention. Figure 1
In (a), (b), and (c), reference numerals 21 and 22 denote an anode foil and a cathode foil having terminal portions 21a and 22a protruding outwardly from the end face, and the anode foil 21 and the cathode foil 22 having the electrolyte layer 23 therebetween. The capacitor element 24 is formed by stacking a plurality of layers with the interposing. And the anode foil 21
When a plurality of layers of the cathode foil 22 and the cathode foil 22 are laminated with the electrolyte layer 23 interposed therebetween, the terminal portion 21a of the anode foil 21 and the terminal portion 22a of the cathode foil 22 are on opposite sides as shown in FIGS. The terminal portion 21a of the anode foil 21 so that it is positioned
The anode foil 21 and the cathode foil 22 are laminated in multiple stages with the electrolyte layer 23 interposed so that the gap A and the gap B between the terminal portions 22a of the cathode foil 22 are sequentially displaced at equal intervals.

The terminal portions 21a of the plurality of anode foils 21 and the plurality of cathode foils 2 in the capacitor element 24 are also provided.
External terminals 25a and 25b are connected to the second terminal portion 22a as shown in FIGS. 1 (a) and 1 (b), and the external terminals 25a and 25b are cut at a portion C in FIG. 1 (b). As a result, the external terminal 25a on the anode side and the external terminal 25b on the cathode side are separated. A sealing member 26 seals the capacitor element 24.

Next, specific examples of the present invention will be described. (Example 1) As shown in FIGS. 2A and 2B, a width of 30 mm
Anode foil 21 made of aluminum (withstand voltage of 600 V) is cut into a length of 40 mm in the shape of EE ', FF', and GG ', and a cathode foil 22 made of aluminum having a width of 30 mm is cut at AA. A tin-plated copper-coated steel wire having a shape of ', B-B', C-C ', D-D', cut to a length of 40 mm and protruding outwardly from the end faces of the anode foil 21 and the cathode foil 22. And the aluminum portions of the terminal portions 21a and 22a made of the aluminum portion are connected by caulking, and then,
As shown in (c), a capacitor element 24 was constructed by alternately stacking anode foil 21 and cathode foil 22 in multiple stages with an electrolyte layer 23 made of a separator having a thickness of 50 μm interposed therebetween.

In this case, the anode foil 21 and the cathode foil 22 are 3
A sheet of anode foil 21 and four sheets of cathode foil 22 were alternately laminated so that the terminal portion 21a of the anode foil 21 and the terminal portion 22a of the cathode foil 22 were located on opposite sides, respectively. A between the terminal portions 21a of the anode foil 21 and B between the terminal portions 22a of the cathode foil 22.
Cut the anode foil 21 into a shape of EE ', FF', GG 'to a length of 40 mm, and cut the cathode foil 22 with A-.
A ', B-B', C-C ', D-D' shape and length 40
Since they are cut into mm, they are sequentially shifted at equal intervals by alternately stacking them with their ends aligned as shown in FIG. 2 (c).

After that, the periphery of these is fixed with an adhesive tape 29 made of polyethylene terephthalate, and the electrolyte layer 23 made of a separator is impregnated with a driving electrolytic solution having a constant electric conductivity of 1.2 mS / cm (30 ° C.). Let
The terminal portions 21a of the plurality of anode foils 21 and the terminal portions 22a of the plurality of cathode foils 22 in the capacitor element 24 have a thickness of about 200 μm shown in FIGS.
External terminal 2 made of tin plated nickel lead frame
5a and 25b are connected by a resistance welding machine,
The external terminals 25a and 25b were separated at a portion C in FIG. 1B to be separated into an anode-side external terminal 25a and a cathode-side external terminal 25b. And finally Figure 1 (b)
Sealing member 26 made of the laminated film shown in (c)
By sealing the capacitor element 24 including part of the external terminals 25a and 25b, an aluminum electrolytic capacitor as shown in FIG. 1A was constructed.

(Embodiment 2) As shown in FIGS. 2 (a) and 2 (b), an anode foil 21 (withstand voltage of 600 V) made of aluminum having a width of 30 mm was formed into EE ', FF', and GG '. The shape is cut into a length of 40 mm, and the cathode foil 22 made of aluminum having a width of 30 mm is cut along AA ', BB', CC ',
The anode foil 21 and the cathode foil 22 are cut to a length of 40 mm in the shape of D-D ', and a terminal portion 21a composed of a tin-plated copper-coated steel wire and an aluminum portion protruding outward from the end surface,
Connect the aluminum part of 22a by caulking,
And the thickness of 50 μm on the anode foil 21 and the cathode foil 22.
Conductivity of 0.6 mS / cm, mainly of polyoxyethylene
After coating and curing an electrolyte layer 23a (also functioning as a separator) made of a solid electrolyte of ion conductive polymer (at 25 ° C.), a capacitor is obtained by alternately stacking anode foil 21 and cathode foil 22. Element 24 was constructed.

In this case, the anode foil 21 and the cathode foil 22 have three pieces of the anode foil 21 and four pieces of the cathode foil 22, respectively, and the terminal portion 21a of the anode foil 21 and the terminal portion 22a of the cathode foil 22 are located on opposite sides. The layers were stacked alternately so that they could be wound. A between the terminal portions 21a of the anode foil 21 and B between the terminal portions 22a of the cathode foil 22.
Cut the anode foil 21 into a shape of EE ', FF', GG 'to a length of 40 mm, and cut the cathode foil 22 with A-.
A ', B-B', C-C ', D-D' shape and length 40
Since they are cut into mm, they are sequentially shifted at equal intervals by alternately stacking them with their ends aligned as shown in FIG. 2 (c).

In the capacitor element 24 thus constructed, the terminal portions 21a of the plurality of anode foils 21 and the terminal portions 22a of the plurality of cathode foils 22 are provided in FIG.
External terminals 25a and 25b made of a tin-plated nickel lead frame having a thickness of about 200 μm shown in FIG. 2B are connected by soldering using a solder paste, and the external terminals 25a and 25b are C in FIG. 1B. By disconnecting at the portion, the external terminal 25a on the anode side and the external terminal 25b on the cathode side were separated. And finally, Fig. 1 (b) (c)
By encapsulating the capacitor element 24 including a part of the external terminals 25a and 25b by the encapsulating member 26 for encapsulating the liquid epoxy resin in the thin case of polyphenylene sulfide shown in FIG. An aluminum electrolytic capacitor as shown in 1 (a) was constructed.

(Embodiment 3) As shown in FIG.
Anode foil 21 made of 0 mm aluminum (withstand voltage 49 V)
Were cut into a length of 40 mm in the form of EE ', FF', and GG ', respectively, and these cut surfaces were reoxidized. About 10μ
An electrolyte layer 23b made of polypyrrole, which is a solid electrolyte of an electron-conducting polymer having a conductivity of about 8 S / cm (25 ° C.).
A capacitor element 24 is formed by forming (also functioning as a separator) by electrolytic polymerization, and further forming a cathode layer 27 of carbon and conductive silver paint on the capacitor element 24, and laminating a plurality of capacitor elements 24. did.

In this case, the three layers are laminated so that the terminal portions 21a connected to the anode foil 21 by caulking are located in the same direction and the distances D between the terminal portions 21a are sequentially displaced at equal intervals. The capacitor element 24 was laminated. The terminal portion 21a of the anode foil 21 and the cathode layer 27 of the plurality of capacitor elements 24 configured as described above have a structure shown in FIG.
External terminals 25a, 25 made of tin-plated nickel lead frame with a thickness of about 200 μm shown in FIGS.
The external terminal 25a and the external terminal 25b were separated from the external terminal 25a on the side of the anode and the external terminal 25b on the side of the cathode by disconnecting the external terminal 25a and 25b at the portion E of FIG. 4B.
Finally, a sealing member 2 for sealing by transfer molding with an epoxy resin shown in FIGS. 4B and 4C.
By sealing the capacitor element 24 including a part of the external terminals 25a and 25b by 6b, as shown in FIG.
An aluminum solid electrolytic capacitor as shown in was constructed.

(Embodiment 4) As shown in FIGS. 5A and 5B, the terminal portion 28a made of a tantalum wire was embedded by changing the embedding position, and the width was 3.4 mm and the length was 4.0 mm.
The anode body 28 made of tantalum having a thickness of 0.5 mm (withstand voltage of 48
V) is prepared, and a solid electrolyte layer 23c (also functioning as a separator) made of manganese dioxide which is a solid electrolyte is formed on the anode body 28 by a thermal decomposition reaction of manganese nitrate, and carbon is further formed thereon. The capacitor element 24 was formed by forming the cathode layer 27 of conductive silver paint, and a plurality of capacitor elements 24 were laminated as shown in FIG.

In this case, the three capacitors are laminated so that the terminal portions 28a made of tantalum wire embedded in the anode body 28 are located in the same direction and the distances D between the terminal portions 28a are sequentially displaced at equal intervals. The element 24 was laminated. The terminal portion 28a of the anode body 28 and the cathode layer 27 of the plurality of capacitor elements 24 configured as described above are provided with the structure shown in FIG.
External terminals 25a, 25 made of tin-plated nickel lead frame with a thickness of about 200 μm shown in FIGS.
The external terminal 25a and the external terminal 25b were separated from the external terminal 25a on the side of the anode and the external terminal 25b on the side of the cathode by disconnecting the external terminal 25a and 25b at the portion E of FIG. 4B.
Finally, a sealing member 2 for sealing by transfer molding with an epoxy resin shown in FIGS. 4B and 4C.
By sealing the capacitor element 24 including a part of the external terminals 25a and 25b by 6b, as shown in FIG.
A tantalum solid electrolytic capacitor as shown in was constructed.

Next, a conventional example for comparison with the concrete examples 1, 2, 4 of the present invention will be described.

(Prior Art Example 1) For comparison with Examples 1 and 2 of the present invention, as shown in FIG. 10, width 30 mm × length 120
An aluminum internal terminal 5 having a protruding portion 5a of a tin-plated copper-coated steel wire is connected to an anode foil 1 (withstand voltage of 600 V) and a cathode foil 2 made of aluminum of mm by caulking, and the anode foil 1 and the cathode are connected. The foil 2 is wound in the same direction through a separator 3 having a thickness of 50 μm, and the periphery thereof is fixed with a winding tape 7 made of polyethylene terephthalate, and then a constant electric conductivity of 1.2 mS / cm (30 ° C.) for driving The separator 3 is impregnated with the electrolytic solution to form the capacitor element 6, and the capacitor element 6 is housed in the bottomed cylindrical metal case 8 made of aluminum, and the opening of the metal case 8 is made of rubber. The sealing terminal portion 9 is formed, and the side surface and the upper surface of the sealing terminal portion 9 are sealed by drawing to form an aluminum electrolytic capacitor.

(Conventional Example 2) For comparison with Example 4 of the present invention, as shown in FIG. 12 (a), a width of 3.4 mm in which an internal terminal portion 15a made of a tantalum wire was embedded and a length of 4. 0
solid electrolyte layer 16 made of manganese dioxide, which is a solid electrolyte, due to a thermal decomposition reaction of manganese nitrate on an anode body 15 (withstand voltage of 48 V) made of tantalum and having a thickness of 1.5 mm and a thickness of 1.5 mm.
(Also functioning as a separator) is formed, and the cathode layer 17 is further formed on the cathode layer 17 by carbon or conductive silver paint to form the capacitor element 18, and the internal terminal of the anode body 15 of the capacitor element 18 is formed. The portion 15a and the cathode layer 17 have a thickness of about 200 shown in FIG.
The external terminals 19a and 19b made of a lead frame made of tin-plated nickel having a thickness of μm are connected and the external terminal 1
9a and 19b are cut at the portion F in FIG. 12B, whereby the external terminal 19a on the anode side and the external terminal 1 on the cathode side are cut.
It was separated into 9b. Finally, by sealing the capacitor element 18 including a part of the external terminals 19a and 19b by the sealing member 20 for sealing by transfer molding with epoxy resin shown in FIG. 12 (b),
A tantalum solid electrolytic capacitor as shown in FIG. 12 (b) was constructed.

Table 1 shows basic electric performance (capacitance, loss tangent, leakage current) measured for each of the aluminum electrolytic capacitors obtained in Examples 1 and 2 of the present invention and Conventional Example 1. And FIG. 6 shows the frequency characteristics of these impedances.

[0033]

[Table 1]

Table 2 shows the basic electrical performance (capacitance, tangent of loss angle, leakage current) measured for the tantalum solid electrolytic capacitors obtained in Example 4 of the present invention and Conventional Example 2. Further, FIG. 7 shows frequency characteristics of these impedances.

[0035]

[Table 2]

As is apparent from (Table 1) and (Table 2), Examples 1, 2, and 4 of the present invention have a basic electric performance (measurement frequency 120 Hz) as compared with Conventional Examples 1 and 2. Although the tangent of the loss angle is somewhat small, the inductance can be significantly reduced by adopting the laminated structure in the high frequency region, so that the impedance can be remarkably suppressed as shown in FIGS. 6 and 7. It is a thing.

Further, in the first and second embodiments of the present invention, the anode foil 21 and the cathode foil 22 having the terminal portions 21a and 21b protruding outward from the end face, and the interposition between the anode foil 21 and the cathode foil 22. And electrolyte layers 23 and 23a
The terminal portion 21a of the anode foil 21 and the terminal portion 2 of the cathode foil 22
The anode foil 21 and the cathode foil 2 are arranged such that the terminals 2a are located on opposite sides and the terminal portions A of the anode foil 21 and the terminal portions B of the cathode foil 22 are sequentially displaced at equal intervals.
Since the capacitor element 24 is configured by laminating a plurality of layers of 2 with the electrolyte layers 23 and 23a interposed therebetween, the laminated capacitor element 24 has the anode foil 21 and the anode foil 21 and the cathode side. The terminal portions 21a, 22a projecting outward from the end face of the cathode foil 22 are arranged in a straight line in an oblique direction in order, so that a plurality of anode foils 21 and cathode foils 22 are separated from each other. Connection, terminal part 21 of a plurality of anode foils 21
Since the connection between the terminal portions 22a of the cathode foil 22a and the plurality of cathode foils 22 and the external terminals 25a and 25b can be surely performed, the connection can be made highly reliable and the construction method can be simplified. is there.

In Examples 3 and 4 of the present invention, the electrolyte layer is formed on the anode foil 21 having the terminal portion 21a protruding outward from the end surface or the anode body 28 having the terminal portion 28a protruding outward from the end surface. A capacitor element 24 is configured by providing a cathode layer 27 via 23b and 23c, and the terminal portions 21a of the anode foil 21 in the capacitor element 24 or the terminal portions 28a of the anode body 28 are sequentially displaced at equal intervals. So that a plurality of capacitor elements 2
4 are laminated, the terminal portion 21a protruding from the end surface of the anode foil 21 and the terminal portion 28a protruding from the end surface of the anode body 28 in the plurality of capacitor elements 24 that have been laminated are arranged in a straight line in an oblique direction. The cathode layers 27 in the plurality of capacitor elements 24 are arranged on the line.
Will be contacted one after another by stacking, which results in
Connection of a plurality of anode foils 21 separated from each other, connection of a plurality of anode bodies 28, connection of cathode layers 27 of a plurality of capacitor elements 24, and terminal portions 21a of a plurality of anode foils 21. Since the connection with the external terminals 25a and the connection between the terminal portions 28a of the plurality of anode bodies 28 and the external terminals 25a can be made surely, highly reliable connection is possible and the construction method is simplified. It can be achieved.

In the first and second embodiments of the present invention, the external terminal 25a on the anode side and the terminal portion 25b on the cathode side are drawn out from the same direction as shown in FIGS. As described above, FIG. 8 (a) (b)
As shown in (c) and FIGS. 9A, 9B, and 9C, the external terminal 25a on the anode side and the external terminal 25b on the cathode side may be pulled out in the opposite directions. The other configurations in FIGS. 8A, 8B and 9C and FIGS. 9A, 9B and 9C are the same as those of the first and second embodiments of the present invention.

[0040]

As described above, according to the electrolytic capacitor of the present invention, the anode foil and the cathode foil having the terminal portion protruding outward from the end face, and the electrolyte layer interposed between the anode foil and the cathode foil. So that the terminal portion of the anode foil and the terminal portion of the cathode foil are located on opposite sides, and the terminal portions of the anode foil and the terminal portions of the cathode foil are sequentially displaced at equal intervals. In addition, since the capacitor element is configured by stacking the anode foil and the cathode foil in a plurality of stages with the electrolyte layer interposed therebetween, the capacitor element after the stacking is formed on both the anode side and the cathode side by the anode foil and The terminal portions projecting outward from the end face of the cathode foil will be aligned in a straight line in an oblique direction, whereby a plurality of anode foils and cathode foils that are separated from each other are connected, and a plurality of anode foils are connected. Edge of foil Since the parts and a plurality of connection between the terminal portions and the external terminals of the cathode foil can be reliably performed,
The connection can be made highly reliable and the construction method can be simplified. Further, since this electrolytic capacitor is a laminated type, it is possible to obtain an electrolytic capacitor having a laminated structure which has a low impedance even in a high frequency region and has a low profile and which can be surface-mounted with high productivity. .

[Brief description of drawings]

1A is a perspective view of an aluminum electrolytic capacitor according to an embodiment of the present invention, FIG. 1B is a plan view showing an assembled state of the aluminum electrolytic capacitor, and FIG. 1C is a front view showing an assembled state of the aluminum electrolytic capacitor.

2A is a plan view showing a cut shape of a cathode foil in the aluminum electrolytic capacitor, FIG. 2B is a plan view showing a cut shape of an anode foil in the aluminum electrolytic capacitor, and FIG. 2C is a plan view showing an anode foil and a cathode in the aluminum electrolytic capacitor. Front view showing a state in which foils are laminated via an electrolyte layer

FIG. 3 is a front view showing an assembled state of the solid electrolytic capacitor of one embodiment of the present invention.

FIG. 4A is a perspective view of a multilayer electrolytic capacitor according to an embodiment of the present invention. FIG. 4B is a plan view showing an assembled state of the multilayer electrolytic capacitor. FIG. 4C is a front view showing an assembled state of the multilayer electrolytic capacitor. Figure

FIG. 5A is a perspective view of a capacitor element in a solid electrolytic capacitor according to an embodiment of the present invention. FIG. 5B is a perspective view showing a state in which the embedding position of the terminal portion of the capacitor element is changed.

FIG. 6 is a characteristic diagram showing the relationship between the impedance and the measurement frequency of the aluminum electrolytic capacitors obtained in Examples 1 and 2 of the present invention and Conventional Example 1, respectively.

FIG. 7 is a characteristic diagram showing the relationship between the impedance and the measurement frequency of the tantalum solid electrolytic capacitors obtained in Example 4 of the present invention and Conventional Example 2 respectively.

FIG. 8 (a) is a perspective view showing another embodiment of the aluminum electrolytic capacitor according to the embodiment of the present invention (b) is a plan view showing the assembled state of the aluminum electrolytic capacitor, and (c) shows the assembled state of the aluminum electrolytic capacitor. Front view showing

FIG. 9A is a perspective view showing still another form of the aluminum electrolytic capacitor according to the embodiment of the present invention. FIG. 9B is a plan view showing an assembled state of the aluminum electrolytic capacitor. FIG. 9C is a assembled state of the aluminum electrolytic capacitor. Front view showing

FIG. 10 is a cutaway perspective view of an aluminum electrolytic capacitor using an anode foil and a cathode foil of Conventional Example 1.

FIG. 11A is a perspective view of an element of a solid electrolytic capacitor using an anode body showing a conventional example. FIG. 11B is a perspective view of an element of a solid electrolytic capacitor using an anode foil or an anode plate showing a conventional example.

FIG. 12 (a) is a perspective view of an element of a solid electrolytic capacitor using an anode body of Conventional Example 2; and (b) is a perspective view showing an assembled state of the solid electrolytic capacitor.

[Explanation of symbols]

 21 Anode foil 21a Terminal part 22 Cathode foil 22a Terminal part 23, 23a, 23b, 23c Electrolyte layer 24 Capacitor element 25a, 25b External terminal 27 Cathode layer 28 Anode body 28a Terminal part

Claims (4)

[Claims] 1. An anode foil and a cathode foil each having a terminal portion protruding outwardly from an end face, and an electrolyte layer interposed between the anode foil and the cathode foil, wherein the terminal portion of the anode foil and the cathode are formed. Intercalate the anode and cathode foils so that the foil terminals are on opposite sides and that the anode foil terminals and the cathode foil terminals are sequentially displaced at equal intervals. An electrolytic capacitor in which a capacitor element is formed by laminating a plurality of layers, and one external terminal is connected to each of the terminal portions of a plurality of anode foils and the terminal portions of a plurality of cathode foils of the capacitor element. 2. A capacitor element is constructed by providing a cathode layer through an electrolyte layer on an anode body having a terminal portion projecting outward from an end face, and the terminal portions of the anode body in this capacitor element are evenly spaced. A plurality of capacitor elements are laminated so as to be sequentially displaced, and one external terminal is connected to the terminal portion of the anode body of the plurality of capacitor elements, and one is connected to the cathode layer of the plurality of capacitor elements. Electrolytic capacitor with external terminal connected. 3. The electrolytic capacitor according to claim 1, wherein the electrolyte layer is composed of a driving electrolytic solution and a separator impregnated with or holding an inorganic or organic solid electrolyte. 4. The electrolytic capacitor according to claim 1, wherein the electrolyte layer comprises an inorganic or organic solid electrolyte layer.