CN108923508A - A kind of active equalization of battery device containing flyback converter - Google Patents
A kind of active equalization of battery device containing flyback converter Download PDFInfo
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- CN108923508A CN108923508A CN201811175042.3A CN201811175042A CN108923508A CN 108923508 A CN108923508 A CN 108923508A CN 201811175042 A CN201811175042 A CN 201811175042A CN 108923508 A CN108923508 A CN 108923508A
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- 230000005284 excitation Effects 0.000 claims abstract description 5
- 238000010521 absorption reaction Methods 0.000 claims description 37
- 239000003381 stabilizer Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 2
- 239000013589 supplement Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 16
- 239000000178 monomer Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 13
- 238000004146 energy storage Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 206010037660 Pyrexia Diseases 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 238000007600 charging Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The present invention devises a kind of active equalization of battery device containing flyback converter, including battery pack, driving unit, balanced unit；Driving unit input anode is connect with anode B+, and input cathode is connect with battery cathode B-, the input terminal series connection of output cathode and output negative pole and all balanced units, forming circuit；Balanced unit includes balanced output terminal and secondary side Same Name of Ends, is connected respectively with the positive and negative anodes of wanted balanced battery cell；The circuit of reversed excitation of connecting of driving unit and balanced unit composition single tube driving；The structure of balanced unit is that primary side can bypass inverse-excitation converting, secondary side can bypass inverse-excitation converting.The device can carry out simultaneously Balance route to any number of single batteries, and equalization efficiency is high, in addition to driving unit, does not need high-speed power switching device, it is only necessary to controllable switch identical with single battery quantity；During Balance route, energy supplement can be carried out to the lower single battery of capacity, achieved the purpose that full of battery.
Description
Technical field
The present invention relates to a kind of active equalization of battery device containing flyback converter, belongs to the pipe of the associated batteries such as lithium battery
Reason system especially connects to multiple single batteries and carries out balanced equalizing circuit.
Background technique
With the development of lithium battery and energy storage technology, the requirement to battery management system is also higher and higher.Multiple monomer electricity
Pond series connection can lead to the problem of unbalanced since the performance of single battery itself is inconsistent in charge and discharge process, will cause battery
Aging, influence service life and the safety of battery.
Carrying out balanced method to battery at present mainly has passive type equalization methods and active equalization methods.It is wherein passive
Formula equalization methods are mainly resistance consuming type, and in an each single battery shunt resistance in parallel, energy consumption equilibrium is exactly that will hold
Extra energy consumption is fallen in the more battery of amount, realizes the equilibrium of whole group cell voltage.Such as Chinese patent CN102457078A,
CN106329667A, CN102195314A, CN107492924A, CN108063473A individually disclose several various forms of consumptions
It can formula equalizing circuit and its control method.Consuming type equilibrium, which can not only consume valuable energy, can also cause system heat generation.
Active equalization method be by monomer energy it is high to be transferred to monomer energy low, or with whole group energy supplement to monomer
Minimum battery needs an energy storage link in implementation process, energy is allowed to re-start distribution by this link well.It is Chinese special
Sharp CN 207098716 U, CN103248077A, CN105391130A, CN102111003A, CN104113110A disclose several
Kind use inductive energy storage battery equalizing circuit, and CN107994651A, CN103051029A, CN107579575A,
CN107317376A, CN106816930A disclose several battery equalizing circuits using capacitive energy storage.No matter being stored up using inductance
Capacitive energy storage can be still used, requires the device for power switching of multiple high-speed switches, higher cost, control are complicated, and cannot
Balance route is carried out to any single battery simultaneously, therefore equalization efficiency is lower.
Chinese patent CN104577227A, CN104201743, CN107785957A, CN107834655A disclose several
Using transformer isolation or DC/DC converter centralization active equalization circuit is used, due to only with a transformer equilibrium
All single batteries, therefore transformer tapping is more, fabrication and installation are difficult, the variation of improper battery pack.Furthermore it needs multiple high
Fast device for power switching, control at high cost are complicated.And multiple any single batteries cannot be carried out simultaneously balanced.
Chinese patent CN203933055U discloses a kind of battery equalizing circuit based on Flyback converter, the circuit
It is battery balanced to realize to battery pack transmission energy by single battery.But the more complicated needs of the circuit structure and monomer
The identical power switch of number of batteries, selection switch, power diode, electrolytic capacitor, therefore cost is very high.And the circuit
Energy transfer can only be carried out to a single battery or adjacent several batteries simultaneously by selection switch, therefore cannot be right
Any number of batteries carry out equilibrium, and equalization efficiency is lower.Furthermore the final portfolio effect of the equalizing circuit can not make electric energy energy
It is full of, it is also necessary to which additional control charges to battery pack.
In conclusion passive type equalizing circuit has the energy that can not only consume preciousness in the prior art, but also can draw
Play the problems such as system heat generation.Active equalization needs multiple high-speed power switching devices, and at high cost, control complexity needs to dissipate
Heat, cannot multiple any single batteries balanced simultaneously, equalization efficiency it is low.In addition to this some circuits cannot make battery by equilibrium
The energy of group obtains supplement and achievees the purpose that full of battery.
Summary of the invention：
It, compared with prior art, can be to any number of the purpose of the invention is to provide a kind of battery balanced device
Single battery carries out Balance route simultaneously, and equalization efficiency is high, in addition to driving unit, does not need high-speed power switching device, cost
Low, control simple and flexible, fever are low, it is only necessary to controllable switch identical with single battery quantity.In addition, in Balance route
In the process, energy supplement can be carried out to the lower single battery of capacity, achieved the purpose that full of battery.
The technical scheme adopted by the invention is as follows：
In order to achieve the above object, a kind of battery balanced device containing flyback converter of the invention, including battery pack, drive
Moving cell, balanced unit, battery pack include anode B+, battery cathode B-, and the battery pack further includes detection line, equilibrium
Line；The driving unit includes input anode, input cathode, output cathode and output negative pole, the electricity of input anode and battery pack
Pond anode B+ connection, input cathode are connect with battery cathode B-, the input of output cathode and output negative pole and all balanced units
End is connected in series, forming circuit；The balanced unit includes balanced output terminal and secondary side Same Name of Ends, respectively with wanted balanced electricity
The positive and negative anodes of pond monomer are connected；The circuit of reversed excitation of connecting of the driving unit and balanced unit composition single tube driving；It is described equal
The structure of weighing apparatus unit is that primary side can bypass inverse-excitation converting, secondary side can bypass inverse-excitation converting.
The driving unit further includes absorbing circuit, power switch, current sensor；The input anode, output cathode
It linking together, absorbing circuit is connected in parallel on output cathode, output negative pole both ends, and output negative pole is connected with power switch one end,
The other end of power switch is connected after over-current sensor with input cathode；Current sensor detects load current, carries out
Current Feedback Control.
It includes that transformer, diode, controllable bypass switch, primary side are non-same that the primary side, which can bypass inverse-excitation converting balanced unit,
Name end, original side of the same name, secondary side Same Name of Ends, balanced output terminal；The primary side non-same polarity of the controllable bypass switch and transformer,
Original side of the same name is connected, in parallel with primary side, the secondary side Same Name of Ends of transformer and the cathode phase of wanted balanced single battery B (i)
Even, the non-same polarity on secondary side of transformer is connected with the anode of diode, the cathode of diode connect balanced output terminal and with institute
The anode of balanced single battery B (i) is wanted to be connected.
It includes that transformer, diode, controllable bypass switch, primary side are non-same that the pair side, which can bypass inverse-excitation converting balanced unit,
Name end, original side of the same name, secondary side Same Name of Ends, balanced output terminal；The controllable bypass switch is in parallel with the secondary side of transformer, wherein
One end of controllable bypass switch is connected with the anode of diode；The secondary side Same Name of Ends of transformer and wanted balanced single battery B
(i) cathode is connected, and the non-same polarity on secondary side of transformer is connected with the anode of diode, and the cathode connection of diode is balanced defeated
Outlet is simultaneously connected with the anode of wanted balanced single battery B (i).
The controllable bypass switch is in normally open, only can just be connected under the influence of control signals.
The primary side of the transformer of the n balanced unit is sequentially connected in series, i.e., primary side non-same polarity and original side of the same name be successively
Ending is connected；Wherein n is the number of series-connected cell in battery pack；The original side of the same name of 1st balanced unit and driving unit
Output cathode is connected, and n-th of primary side non-same polarity is connected with the output negative pole of driving unit；(i=1,2/3 ... n) i-th described
When the controllable bypass switch of balanced unit is by control closure, which is bypassed, no longer i-th of single battery is carried out
It is balanced.
The absorbing circuit is voltage clamping formula, resistance-capacitance type, RDC formula；Voltage clamping formula absorbing circuit include absorb two poles,
Pressure stabilizing is absorbed, two poles is absorbed and connects with pressure stabilizing is absorbed, the anode for absorbing two poles connects output negative pole, absorbs the anode connection of pressure stabilizing
Output cathode；Resistance-capacitance type absorbing circuit includes Absorption Capacitance, absorption resistance, the two series connection；RDC formula absorbing circuit includes absorbing two
Pole, Absorption Capacitance, absorption resistance, the anode for absorbing two poles connect output negative pole, and Absorption Capacitance, one termination of absorption resistance parallel connection are inhaled
The cathode of two poles is received, other end connects output cathode.
By the control to balanced unit, Balance route can be carried out to 1 to n-1 battery cell simultaneously, wherein n is
Battery cell number, n are the integer more than or equal to 1.
The input terminal of the driving unit can also be connected with independent external power supply.
Since above-mentioned technical proposal is used, the present invention has following advantages and effect compared with prior art：
An effect of the invention is, using active equalization control mode, reduces energy content of battery loss, reduces balanced electricity
Resistance fever.
An effect of the invention is, carries out Balance route using flyback converter module, is only applicable in a high frequency function
Rate switching device, cost substantially reduce, and control simple and flexible.
An effect of the invention is that each balanced unit uses independent high frequency transformer, and structure is simple, installation side
Just, it can be connected with any number of batteries balanced, realize the electrical isolation of active equalization power supply and single battery, more safety can
It leans on.
An effect of the invention is, can carry out equalization operation simultaneously to any 1 to n-1 single battery, wherein
N is the number of single battery in battery pack.
An effect of the invention is, using controllable switch even relay of low frequency etc. can to balanced unit into
Row bypass makes to control greatly simplified without being controlled equalizing circuit using high frequency power switching device, reduces system
Cost.
An effect of the invention is, while carrying out Balance route to battery, can continue to supplement to battery pack
Electric energy makes battery while reaching equilibrium, also reaches full state.
Detailed description of the invention
Fig. 1 tradition consuming type equalizing circuit schematic diagram；
Fig. 2 traditional inductance stored energy transfer formula equalizing circuit schematic diagram；
Fig. 3 traditional capacitance stored energy transfer formula equalizing circuit schematic diagram；
Fig. 4 conventional monomer to group an energy transfer formula equalizing circuit schematic diagram；
Fig. 5 traditional group is to monomer energy transfer formula equalizing circuit schematic diagram；
Fig. 6 is equalizing circuit schematic diagram of the present invention；
Fig. 7 is that primary side can bypass inverse-excitation converting equalizing circuit schematic diagram in the present invention；
Fig. 8 is that secondary side can bypass inverse-excitation converting equalizing circuit schematic diagram in the present invention；
Fig. 9 is voltage clamping absorbing circuit schematic diagram in the present invention；
Figure 10 is resistance capaciting absorpting circuit schematic diagram in the present invention；
Figure 11 is RDC absorbing circuit schematic diagram in the present invention；
Figure 12 is that independent external power supply application example is connect in the present invention.
In attached drawing, component representated by each label：
1, battery pack, 2, driving unit, 3, balanced unit, 4, external power supply, 101, detection line, 102, equilibrium line, 103,
Anode B+, 104, battery cathode B-, 201, input anode, 202, input cathode, 203, absorbing circuit, 204, power opens
It closes, 205, current sensor, 206, output cathode, 207, output negative pole, 301, transformer, 302, diode, 303, controllable side
Way switch, 304, primary side non-same polarity, 305, original side of the same name, 306, secondary side Same Name of Ends, 307, balanced output terminal, 2031, suction
Receive diode, 2032, absorption voltage-stabiliser tube, 2033, Absorption Capacitance, 2034, absorption resistance.
Specific embodiment
The present invention is described further with reference to the accompanying drawing.
In the battery management system (bms) that lithium battery is representative, Balance route is single battery equalizaing charge, makes electricity
Each battery all reaches balanced consistent state in the group of pond.Balanced unit is the core component of battery management system.Battery is being made
It makes and the inconsistent phenomenon of performance can be generated in use process, performance is inconsistent to will lead to service life reduction and reliability reduction.Tradition
Balanced unit be divided into active equalization and passive balanced two major class.Passive balanced mainly resistance consuming type, in each list
A body battery shunt resistance in parallel, it is exactly to fall energy consumption extra in the battery more than capacity that energy consumption is balanced, realizes whole group
The equilibrium of cell voltage.Traditional consuming type equalizing circuit schematic diagram as shown in Figure 1, battery pack 1 by n single battery series connection group
At the detection line 101 being attached thereto detects the voltage of single battery by detection unit, controls equilibrium line by voltage detecting
102 balanced units connected.Consuming type balanced unit in Fig. 1 is made of bleeder resistance R (i) and control switch S (i),
The wherein n of i=1,2,3 ....Monomer battery voltage is obtained using detection unit, its control switch S is connected to the higher battery of voltage
(i) and by R (i) electric energy it releases, keeps the voltage of the single battery consistent with other monomers cell voltage.Thus in vain
The electric energy stored in battery is consumed, bleeder resistance R (i) is made to generate heat.
Fig. 2 is traditional inductance stored energy transfer formula equalizing circuit schematic diagram, and S (i) therein is high frequency power switching device, work
Make under HF switch state, usual switching frequency is greater than 10kHz, therefore S (i) has biggish switching loss, and fever is serious.
The equalizing circuit can only carry out electric voltage equalization between two neighboring single battery.For example, if B1 voltage is higher than B2 voltage, just
It controls S1 and carries out chop control, be stored into the electric energy on B1 in L1, and be filled in B2 by D2, it therefore, can only be successively to phase
Adjacent two batteries carry out balanced.If B1 voltage highest, Bn voltage is minimum, then balancing procedure is just very long, equalization efficiency is non-
It is often low, and a large amount of electric energy can be lost in balancing procedure.
It is similar with inductive energy storage for capacitive energy storage transfer type equalizing circuit, see Fig. 3.The energy-storage travelling wave tube of the circuit is capacitor
C(i).S (i) therein is high frequency power switching device, is worked under HF switch state, and usual switching frequency is greater than 10kHz,
Therefore S (i) has biggish switching loss, and fever is serious.The equalizing circuit can only carry out electricity between two neighboring single battery
Pressure is balanced.For example, just controlling S1, S3 and S2 if B1 voltage is higher than B2 voltage, S4 replaces fast conducting.When S1, S3 are connected
When, B1 voltage and the C1 balance of voltage, energy are passed to C1.When S1, S3 are disconnected, and S2, S4 are connected, B2 voltage and C1 voltage are flat
Weighing apparatus, electric energy are passed to B2 by C1, so alternately B1 are back and forth made to reach balanced with B2 voltage.Therefore, changing circuit can only be successively to adjacent
Two batteries carry out balanced.If B1 voltage highest, Bn voltage is minimum, then balancing procedure is just very long, equalization efficiency is very
It is low, and a large amount of electric energy can be lost in balancing procedure.Furthermore if can draw when two neighboring monomer battery voltage difference is larger
Biggish euqalizing current is played, the requirement of requirement and capacitor to device for power switching is all very high.
Fig. 4 is conventional monomer to group energy transfer formula equalizing circuit schematic diagram, and each single battery passes through connected
Converter, be filled with entire battery pack after extra electric energy is boosted.But in order to realize the control of multiple single batteries, become
Depressor production is extremely complex, as soon as each single battery requires a winding, such transformer winding number determines battery
Number, if changing the concatenated number of battery, it is necessary to remake transformer.And the installation of transformer is extremely difficult, around
The consistency of group is also difficult to ensure very much.
Fig. 5 is traditional group to monomer energy transfer formula equalizing circuit schematic diagram, is that the energy of battery pack is passed through converter
It is filled with single battery respectively, thus Balance route selectively cannot be carried out to any battery, so control effect is poor.And
And it is also similar with circuit shown in Fig. 4, there is transformer production difficulty, winding consistency is looked into, the bad problem of portfolio effect.
In order to overcome the above problem, the present invention carries out Balance route to single battery using AC converter respectively, becomes
Depressor is mutually indepedent, and simple and reliable, makes and easy for installation, flexible.
The present embodiment as shown in fig. 6, the input anode of driving unit 2 201 is connect with the anode B+103 of battery pack 1,
Input cathode 202 is connect with battery cathode B-104, or is connected respectively with the positive and negative anodes of independent external power supply 4, such as Figure 12
Shown, external power supply can be charger and be also possible to other DC power supplies.The number of balanced unit 3 and the list in battery pack 1
Body battery number n is identical, and the output end of balanced unit 3 is connected with the positive and negative anodes of corresponding single battery respectively.N
The input terminal of weighing apparatus unit 3, which joins end to end, is connected to form circuit with the output end of driving unit 2, and forms original with power switch 204
The concatenated inverse excitation type converter in side reaches balanced as shown in fig. 7, providing energy by the single battery in the lateral battery pack 1 of power supply
The effect of battery capacity.
In the present embodiment, driving unit 2 includes input anode 201, input cathode 202, absorbing circuit 203, power switch
204, current sensor 205, output cathode 206, output negative pole 207.The input anode 201, output cathode 206 are connected to one
It rises, and is connect with the anode of absorbing circuit 203, the negative terminal of absorbing circuit 203 is connected with output negative pole 207, that is, absorbs electricity
Road 203 is connected in parallel on output cathode 206,207 both ends of output negative pole.Output negative pole 207 is connected with 204 one end of power switch, function
The other end of rate switch 204 is connected after over-current sensor 205 with input cathode 202.Power switch 204 can be by
IGBT, MOSFET constant power semiconductor devices composition, by PWM control can to current sensor 205 detect load current into
Row Current Feedback Control, that is, the euqalizing current of balance module is controlled, make up to the purpose of fast uniform.Specifically
Circuit is shown in Fig. 7.
Embodiment shown in Fig. 7 is that primary side can bypass inverse-excitation converting equalizing circuit, balanced unit 3 include transformer 301,
Diode 302, controllable bypass switch 303, primary side non-same polarity 304, original side of the same name 305, secondary side Same Name of Ends 306, equilibrium are defeated
Outlet 307.The controllable bypass switch 303 is connected with the primary side non-same polarity 304 of transformer 301, original side of the same name 305, with
Primary side is in parallel.Controllable bypass switch 303 usually can be using the controllable switch of more low speed, such as mechanical relay, dry spring
Pipe relay, electronic switch etc., controllable bypass switch 303 must use structure open in usual, that is, in uncontrolled signal
Controllable bypass switch 303 is not turned on, to guarantee security of system.The PWM control of high speed is not needed, it is thus only necessary to it is logical to control it
It is disconnected.When controllable bypass switch 303 is connected, the primary side of transformer 301 in parallel is just bypassed, and electric energy can not just pass through
Balanced unit 3 passes to connected single battery B (i).When controllable bypass switch 303 disconnects, transformer 301 in parallel
Primary side just access drive module 2, and form inverse excitation type converter with drive module 2, electric energy passes to institute by balanced unit 3
The single battery B (i) of connection achievees the purpose that equilibrium.
The secondary side Same Name of Ends 306 of transformer 301 is connected with the cathode of wanted balanced single battery B (i), transformer 301
The non-same polarity on secondary side be connected with the anode of diode 302, the cathode connection balanced output terminal of diode 302 and with want equal
The anode of the single battery B (i) of weighing apparatus is connected.When power switch 204 is connected, the primary current of transformer 301 increases, in transformation
The Same Name of Ends on the secondary side of the original of device induces positive voltage, therefore diode 302 ends.When power switch 204 turns off, transformer
301 energy transfers stored during power switch 204 is connected are to the secondary side of transformer 301, on the secondary side of the original of transformer
Same Name of Ends induces negative voltage, therefore diode 302 is connected, and the energy of storage is passed through diode by the secondary side of transformer 301
302, to single battery B (i) transmission connected, achieve the purpose that equilibrium.Therefore, in equalization operation, if driving unit 2
Input anode 201 and input cathode 202 be connected respectively with the positive and negative anodes of independent external power supply 4, then the present invention to list
Body battery carries out also constantly supplementing energy during equalization operation for battery, when n single batteries all in battery pack 1 reach
When balanced, the electric energy of battery pack 1 is also just filled with.It controls in this way, electric energy benefit will also be carried out after battery balanced by eliminating
The process of charging.Save the charging time.
In another embodiment, balanced unit 3 is that secondary side can bypass flyback converter, as shown in Figure 8.It is described balanced single
Member 3 includes transformer 301, diode 302, controllable bypass switch 303, primary side non-same polarity 304, original side of the same name 305, secondary side
Same Name of Ends 306, balanced output terminal 307.The controllable bypass switch 303 is in parallel with the secondary side of transformer 301, wherein controllable bypass
One end of switch 303 is connected with the anode of diode 302.The secondary side Same Name of Ends 306 of transformer 301 and wanted balanced monomer are electric
The cathode of pond B (i) is connected, and the non-same polarity on the secondary side of transformer 301 is connected with the anode of diode 302, the yin of diode 302
Pole connects balanced output terminal and is connected with the anode of wanted balanced single battery B (i).The controllable bypass switch 303 and change
The primary side of depressor 301 is in parallel, or identical as the secondary side parallel connection role of transformer 301, is all to bypass balanced unit 2
Fall, prevents energy to the single battery transmission connected.Usually when monomer battery voltage reaches the value of setting, control controllable other
Way switch 303 is connected, and balanced unit 2 is bypassed.
In both the above embodiment, the primary side of the transformer 301 of the n balanced unit 3 is sequentially connected in series, i.e., primary side is non-
Same Name of Ends 304 successively finishes up with original side of the same name 305 to be connected.Wherein n is the number of series-connected cell in battery pack 1.1st equilibrium
The original side of the same name 305 of unit 3 is connected with the output cathode 206 of driving unit 2, and n-th of primary side non-same polarity 304 and driving are single
The output negative pole 207 of member 2 is connected.The controllable bypass switch 303 of i-th described (i=1,2/3 ... the n) balanced unit 3 passes through control
When closure, which is bypassed, equilibrium no longer is carried out to i-th of single battery, sees Fig. 7, Fig. 8.The present invention is merely with one
The power switch 204 of a high-frequency work is achieved that while carrying out Balance route to any single battery, not only greatly reduces
The cost of device, and improve the flexibility of system control.Since balanced unit 3 uses independent transformer 301,
Balanced unit 3 is relatively independent, can arbitrarily connect.So Balance route can be carried out for the battery pack 1 of different monomers quantity,
The redundancy and waste that not will cause device, save the cost of system.
When power switch 204 carries out switch control, higher voltage can be induced in the primary side of transformer 301, such as
Fruit, which is not cooked protection, to generate adverse effect to power switch 204, or even can be punctured power switch 204, and then make whole device
Failure.Thus the present invention concatenated transformer 301 a primary side absorbing circuit 203 in parallel, for power switch 204
Protection.
In one embodiment, absorbing circuit 203 includes absorption diode 2031, absorbs the composition voltage clamp of voltage-stabiliser tube 2032
Position formula absorbing circuit, absorption diode 2031 are connected with voltage-stabiliser tube 2032 is absorbed, and the anode of absorption diode 2031 connects output
Cathode 207, the anode for absorbing voltage-stabiliser tube 2032 connect output cathode 206.It is absorbed when the concatenated voltage of 301 primary side of transformer is higher than
When the voltage of voltage-stabiliser tube 2032, absorbs voltage-stabiliser tube 2032 and be connected, it is by absorption diode 2031, concatenated transformer 301 is former
Polygonal voltage is clamped down on the voltage for absorbing voltage-stabiliser tube 2032, is guaranteed 204 trouble free service of power switch, is seen Fig. 9.
In another embodiment, absorbing circuit 203 further includes that Absorption Capacitance 2033, absorption resistance 2034 are composed in series resistance
Appearance formula absorbing circuit.When concatenated 301 primary side of transformer induces high voltage, by absorption resistance 2034 to Absorption Capacitance
2033 chargings, absorb portion of energy, prevent induced voltage excessively high, see Figure 10.
In order to improve the assimilation effect of resistance capaciting absorpting circuit, in another embodiment, the absorbing circuit 203 further includes
Absorption diode 2031, Absorption Capacitance 2033, absorption resistance 2034 form RDC formula absorbing circuit.The sun of absorption diode 2031
Pole connects output negative pole 207, and Absorption Capacitance 2033,2034 parallel connection one of absorption resistance terminate the cathode of absorption diode 2031, separately
Outer one end connects output cathode 206, sees Figure 11.
In one embodiment, the input terminal of driving unit 2 can connect independent external power supply 4, see Figure 12.
The foregoing description of the disclosed embodiments, being only used for professional and technical personnel in the field can be realized or use this hair
It is bright.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present invention, therefore sheet
Invention is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and innovative point phase
Consistent widest scope.
Claims (9)
1. a kind of active equalization of battery device containing flyback converter, including battery pack (1), driving unit (2), balanced unit
(3), battery pack (1) includes anode B+ (103), battery cathode B- (104), which is characterized in that the battery pack (1) is also wrapped
Include detection line (101), equilibrium line (102)；The driving unit (2) includes inputting positive (201), input cathode (202), output
Positive (206) and output negative pole (207) input positive (201) and connect with the anode B+ (103) of battery pack (1), and input is negative
Pole (202) is connect with battery cathode B- (104), output cathode (206) and output negative pole (207) and all balanced units (3)
Input terminal is connected in series, forming circuit；The balanced unit (3) includes balanced output terminal (307) and secondary side Same Name of Ends (306),
It is connected respectively with the positive and negative anodes of wanted balanced battery cell；The driving unit (2) and balanced unit (3) composition single tube drive
Dynamic series connection circuit of reversed excitation；The structure of the balanced unit (3) is that primary side can bypass inverse-excitation converting, secondary side can bypass flyback change
It changes.
2. a kind of active equalization of battery device containing flyback converter as described in claim 1, which is characterized in that the driving
Unit (2) further includes absorbing circuit (203), power switch (204), current sensor (205)；It is the input positive (201), defeated
Positive (206) link together out, and absorbing circuit (203) is connected in parallel on output cathode (206), output negative pole (207) both ends, output
Cathode (207) is connected with power switch (204) one end, and the other end of power switch (204) is through over-current sensor (205)
It is connected afterwards with input cathode (202)；Current sensor (205) detects load current, carries out Current Feedback Control.
3. a kind of active equalization of battery device containing flyback converter as described in claim 1, which is characterized in that the primary side
It includes that transformer (301), diode (302), controllable bypass switch (303), primary side are non-that inverse-excitation converting balanced unit (3), which can be bypassed,
Same Name of Ends (304), original side of the same name (305), secondary side Same Name of Ends (306), balanced output terminal (307)；The controllable bypass switch
(303) it is connected with the primary side non-same polarity (304) of transformer (301), original side of the same name (305), transformer in parallel with primary side
(301) secondary side Same Name of Ends (306) is connected with the cathode of wanted balanced single battery B (i), the secondary side of transformer (301)
Non-same polarity is connected with the anode of diode (302), the cathode of diode (302) connection balanced output terminal and with it is wanted balanced
The anode of single battery B (i) is connected.
4. a kind of active equalization of battery device containing flyback converter as described in claim 1, which is characterized in that the pair side
It includes that transformer (301), diode (302), controllable bypass switch (303), primary side are non-that inverse-excitation converting balanced unit (3), which can be bypassed,
Same Name of Ends (304), original side of the same name (305), secondary side Same Name of Ends (306), balanced output terminal (307)；The controllable bypass switch
(303) in parallel with the secondary side of transformer (301), wherein controllable bypass switchs one end and the anode phase of diode (302) of (303)
Even；The secondary side Same Name of Ends (306) of transformer (301) is connected with the cathode of wanted balanced single battery B (i), transformer (301)
The non-same polarity on secondary side be connected with the anode of diode (302), the cathode connection balanced output terminal of diode (302) and with institute
The anode of balanced single battery B (i) is wanted to be connected.
5. a kind of active equalization of battery device containing flyback converter as described in claim 3,4, which is characterized in that it is described can
Control by-pass switch (303) is in normally open, only can just be connected under the influence of control signals.
6. a kind of active equalization of battery device containing flyback converter as described in claim 1, which is characterized in that the n
The primary side of the transformer (301) of balanced unit (3) is sequentially connected in series, i.e., primary side non-same polarity (304) and original side of the same name (305) according to
Secondary ending is connected；Wherein n is the number of series-connected cell in battery pack (1)；The original side of the same name (305) of 1st balanced unit (3)
It is connected with the output cathode (206) of driving unit (2), the output of n-th of primary side non-same polarity (304) and driving unit (2) is negative
Pole (207) is connected；The controllable bypass switch (303) of i-th described (i=1,2/3 ... the n) balanced unit (3) passes through control closure
When, which is bypassed, no longer i-th of single battery is carried out balanced.
7. a kind of active equalization of battery device containing flyback converter as claimed in claim 2, which is characterized in that the absorption
Circuit (203) is voltage clamping formula, resistance-capacitance type, RDC formula；Voltage clamping formula absorbing circuit (203) includes absorption diode
(2031), voltage-stabiliser tube (2032) are absorbed, absorption diode (2031) is connected with voltage-stabiliser tube (2032) are absorbed, absorption diode
(2031) anode connects output negative pole (207), and the anode for absorbing voltage-stabiliser tube (2032) connects output cathode (206)；Resistance-capacitance type
Absorbing circuit (203) includes Absorption Capacitance (2033), absorption resistance (2034), the two series connection；RDC formula absorbing circuit (203) packet
Absorption diode (2031), Absorption Capacitance (2033), absorption resistance (2034) are included, the anode connection of absorption diode (2031) is defeated
Cathode (207) out, the cathode of Absorption Capacitance (2033), one termination absorption diode (2031) of absorption resistance (2034) parallel connection, separately
Outer one end connects output cathode (206).
8. a kind of active equalization of battery device containing flyback converter as described in claim 1, which is characterized in that by equal
The control of weighing apparatus unit (3) can carry out Balance route to 1 to n-1 battery cell simultaneously, and wherein n is battery cell number,
N is the integer more than or equal to 1.
9. a kind of active equalization of battery device containing flyback converter as described in claim 1, which is characterized in that the driving
The input terminal of unit (2) can also be connected with independent external power supply (4).
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| CN201811175042.3A CN108923508A (en) | 2018-10-10 | 2018-10-10 | A kind of active equalization of battery device containing flyback converter |
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| CN112952974A (en) * | 2021-03-10 | 2021-06-11 | 华南理工大学 | Hybrid energy storage equalization circuit based on forward and backward flyback converter and control method |
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