CN102832666A - Inductive energy storage based series battery pack discharging balancing circuit - Google Patents
Inductive energy storage based series battery pack discharging balancing circuit Download PDFInfo
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- CN102832666A CN102832666A CN2012103119954A CN201210311995A CN102832666A CN 102832666 A CN102832666 A CN 102832666A CN 2012103119954 A CN2012103119954 A CN 2012103119954A CN 201210311995 A CN201210311995 A CN 201210311995A CN 102832666 A CN102832666 A CN 102832666A
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Abstract
The invention discloses an inductive energy storage based series battery pack discharging balancing circuit. A series battery pack comprises more than three battery unit modules in serial connection, the discharging balancing circuit comprises more than three balancing subcircuits, and each battery unit module is connected with a balancing subcircuit. During discharging process of the series battery pack, a battery management system, according to residual capacity of each battery in the series battery pack, finds out the battery unit module with low residual capacity and sends balancing instructions to a control circuit, and then the control circuit charges odd (even) batteries connected with the control circuit by controlling on and off of an odd MOS (metal oxide semiconductor) pipe Qm (even MOS pipe Qn) of an odd (even) balancing subcircuit. The inductive energy storage based series battery pack discharging balancing circuit can avoid excessive discharging of each battery unit module during discharging, improve unbalance of the series battery pack, improve usable capacity of the battery pack, reduce maintenance and replacement of the series battery pack, and prolong the service life of the battery pack.
Description
Technical field
The present invention relates to a kind of cell balancing, relate in particular to series battery equalization discharge circuit based on inductive energy storage.
Background technology
Series-connected cell is after a plurality of charge and discharge cycles of process; Residual capacity (the SOC of each battery unit module; Three kinds of situation roughly can appear in distribution State of Charge): (SOC, State of Charge) is higher for the residual capacity of (1) individual cell unit module; (2) residual capacity of individual cell unit module (SOC, State of Charge) is on the low side; (3) residual capacity of individual cell unit module (SOC, State of Charge) is higher on the low side with residual capacity (SOC, State of Charge) the individual cell unit module.
To above-mentioned three kinds of situation, domestic and international research person has all proposed the solution of oneself.As being directed against situation (1); There is the researcher to propose the parallel resistance shunting; It falls through resistance consumption through the energy of the corresponding switch of the control battery that residual capacity (SOC, State of Charge) is higher, and this method wastes energy; And in the process of equilibrium, produced a large amount of heat, increased the load of battery thermal management.Also have the researcher to propose the bi-directional DC-DC equalization, equalizing circuits such as coaxial transformer equalization, these circuit transformer of all having sampled makes the cost of equalizing circuit increase.
The method of the balanced control of lithium ion battery group at present by the consumption situation of circuit in the balancing procedure to energy, can be divided into two big types of energy dissipation type and energy non-dissipative types.According to the equalization function classification, can be divided into charge balancing, equalization discharge and dynamic equalization.Charge balancing is meant the equilibrium in charging process, generally is when batteries monomer voltage reaches set point, to begin equilibrium, prevents to overcharge thereby reduce charging current.Equalization discharge is the equilibrium in discharge process, through preventing overdischarge to the low cell makeup energy of dump energy (SOC, State of Charge).The dynamic equalization mode has combined the advantage of charge balancing and equalization discharge, in the whole charging and discharging process, battery pack is carried out equilibrium, has avoided the problem in the single equilibrium.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency that prior art exists; A kind of series battery equalization discharge circuit (EQU) based on inductive energy storage is provided; In the battery management system of series battery, adopt this equalizing circuit (EQU) can guarantee that overdischarge does not appear in the battery unit module in discharge process; Improve the unbalanced phenomenon of series battery, improve the active volume of battery pack, reduce the maintenance and the replacing of series battery; Prolong the useful life of battery pack, reduce the cost of hybrid vehicle, electric automobile and storage station.
To achieve these goals, the present invention is achieved through following technical proposals.
A kind of series battery equalization discharge circuit based on inductive energy storage; Said series battery comprises the battery unit module that is connected in series more than three; Said discharge equalization discharge circuit comprises the balanced electronic circuit more than three, and each battery unit module all is connected with a balanced electronic circuit separately, and said series battery has anode VCC and negative terminal GND; A tie point N with in the said series battery is a separation; Said anode VCC is a forward part to the battery unit module between the tie point N, and tie point N is the rear section to the battery unit module between the negative terminal GND, and the most number of battery unit module is Duoed one than the number of rear section battery unit module in the forward part; The battery unit module of forward part is called strange battery; The battery unit module of rear section is called even battery, and the balanced electronic circuit that is connected with strange battery is called strange balanced electronic circuit, and the balanced electronic circuit that is connected with even battery is called balanced electronic circuit; Forward part series-connected cell unit module is a starting point with tie point N, and anode VCC is a terminal point, in order the battery unit module is designated as the first strange battery B
1, the second strange battery B
3, the 3rd strange battery B
5, name in order according to this, the battery unit module that is connected with terminal point anode VCC is the
Strange battery B
i, i is an odd number, value preferred 1～59; Rear section series-connected cell unit module is a starting point with tie point N, and negative terminal GND is a terminal point, in order the battery unit module is designated as the first even battery B
2, the second even battery B
4, the 3rd even battery B
6, name in order according to this, the element cell that is connected with negative terminal GND is the
Idol battery B
j, j is a positive even numbers, and the j value is preferred 2～60, and the anode of said strange battery connects the strange sustained diode of strange balanced electronic circuit
mNegative electrode a, the negative terminal of said strange battery connects the strange energy storage inductor L of strange balanced electronic circuit
mThe second end d; The anode of said even battery connects the even energy storage inductor L of the balanced electronic circuit of idol
nThe second end h, the negative terminal of said even battery connects even sustained diode
nAnode g.
In the above-mentioned series battery equalization discharge circuit, said strange balanced electronic circuit comprises strange metal-oxide-semiconductor Q
m, strange energy storage inductor L
mWith strange sustained diode
m, strange metal-oxide-semiconductor Q
mDrain electrode, strange sustained diode
mAnode, strange energy storage inductor L
mThe first end three be connected strange sustained diode
mNegative electrode a, strange metal-oxide-semiconductor Q
mGrid b, strange metal-oxide-semiconductor Q
mSource electrode c and strange energy storage inductor L
mThe second end d link to each other.
In the above-mentioned series battery equalization discharge circuit, in the above-mentioned series battery equalization discharge circuit of the balanced electronic circuit of said idol, also comprise even metal-oxide-semiconductor Q
n, even energy storage inductor L
nWith even sustained diode
n, even metal-oxide-semiconductor Q
nSource electrode, even sustained diode
nNegative electrode and even energy storage inductor L
nThe first end three be connected even metal-oxide-semiconductor Q
nDrain electrode e, even metal-oxide-semiconductor Q
nGrid f, even sustained diode
nAnode g and even energy storage inductor L
nThe second end h link to each other.
In the above-mentioned series battery equalization discharge circuit, said battery unit module is lead-acid battery, lithium ion battery, Ni-MH battery or ultracapacitor.
In the above-mentioned series battery equalization discharge circuit, the strange metal-oxide-semiconductor Q of said strange balanced electronic circuit
mGrid b connect control circuit, strange metal-oxide-semiconductor Q
mSource electrode c connect negative terminal GND.
In the above-mentioned series battery equalization discharge circuit, the even metal-oxide-semiconductor Q of the balanced electronic circuit of said idol
nGrid f connect control circuit, even metal-oxide-semiconductor Q
nDrain electrode e connect anode VCC; Said control circuit is used to control the turning on and off of even metal-oxide-semiconductor Qn of strange metal-oxide-semiconductor Qm and the balanced electronic circuit of idol of said strange balanced electronic circuit.
In the above-mentioned series battery equalization discharge circuit, said strange balanced electronic circuit can charge to the coupled strange battery that connects, and the balanced electronic circuit of said idol can charge to the coupled even battery that connects.
In the above-mentioned series battery equalization discharge circuit, strange (idol) energy storage inductor L of said strange (idol) balanced electronic circuit
m(L
n) inductance value come according to concrete requirement fixed.
In the above-mentioned series battery equalization discharge circuit, the size of the frequency of said control circuit output control signal according to the inductance value of strange (idol) energy storage inductor Lm (Ln) of strange (idol) balanced electronic circuit of being controlled, very metal-oxide-semiconductor Qm and even metal-oxide-semiconductor Qn, switching loss, battery unit module voltage, battery unit module capacity decide.The duty ratio of the control signal of said control circuit output makes very, and strange (idol) energy storage inductor Lm (Ln) of (idol) balanced electronic circuit resetted in each signal period; The rising of starting from scratch of the electric current of promptly strange (idol) energy storage inductor Lm (Ln) drops to zero at last again.
In the discharge process of series battery; Battery management system is according to the dump energy (SOC of each battery in the battery pack; State of Charge), find out dump energy (SOC, State of Charge) battery unit module on the low side; Send balanced instruction to control circuit, control circuit is through the strange metal-oxide-semiconductor Q of strange (idol) the balanced electronic circuit of control
m(even metal-oxide-semiconductor Q
n) turn on and off strange (idol) battery charge that connects to coupled.
Compared with prior art, the present invention has following advantage and deficiency: the present invention can be used as the equalizing circuit of battery management system of the energy storage equipment of mixed power electric car or pure electric automobile or storage station.The present invention is owing to adopt above-mentioned equalizing circuit (EQU) technology in the battery management system of series battery; Can guarantee that overdischarge does not appear in each battery unit module in discharge process; Improve the unbalanced phenomenon of series battery, improve the active volume of battery pack, reduce the maintenance and the replacing of series battery; Prolong the useful life of battery pack, reduce the cost of hybrid vehicle, electric automobile and storage station.
Description of drawings
Fig. 1 is the circuit theory diagrams in the execution mode.
Fig. 2 is the schematic diagram of strange equalizing circuit.
Fig. 3 is the schematic diagram of even equalizing circuit.
Fig. 4 is the equalizing circuit sketch map of 4 batteries unit modules series connection.
Fig. 5 is the equalizing circuit sketch map of 5 batteries unit modules series connection.
Fig. 6 is the equalizing circuit sketch map of 14 batteries unit modules series connection.
Embodiment
Elaborate below in conjunction with the accompanying drawing specific embodiments of the invention, but enforcement of the present invention and protection range are not limited thereto.
Among Fig. 1, series battery equalization discharge circuit, each battery unit module is connected with the balanced electronic circuit of a cover; At least three battery unit module series connection, the anode VCC of series battery, negative terminal GND, series battery is divided into forward part, rear section; The tie point N of forward part and rear section, anode VCC is a forward part to the battery unit module of tie point N, tie point N is the rear section to the battery unit module of negative terminal GND; The most number of forward part battery unit module Duos one than the number of rear section battery unit module; Forward part battery unit module is strange battery, and rear section battery unit module is even battery, and strange battery is connected with strange balanced electronic circuit; The idol battery is connected with the balanced electronic circuit of idol; Forward part series-connected cell unit module is a starting point with tie point N, and anode VCC is a terminal point, in order the battery unit module is designated as the first strange battery B
1, the second strange battery B
3, the 3rd strange battery B
5... (and the like), the battery unit module that is connected with anode VCC is
Strange battery B
i(i=1,3,5 ...), be in order to represent that i is an odd number, to represent, not limiting maximum with ellipsis here.Preferred i=1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53,55,57,59.Rear section series-connected cell unit module is a starting point with tie point N, and negative terminal GND is a terminal point, in order the battery unit module is designated as the first even battery B
2, the second even battery B
4, the 3rd even battery B
6... (and the like), the element cell that is connected with negative terminal GND is
Idol battery B
j(j=2,4,6 ...), be in order to represent that j is an even number, to represent, do not limit maximum with ellipsis here, preferred j=2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,32,36,38,40,42,44,46,48,50,52,54,56,58,60.Strange balanced electronic circuit is by strange metal-oxide-semiconductor Q
m, strange energy storage inductor L
m, strange sustained diode
mForm strange metal-oxide-semiconductor Q
mDrain electrode, strange sustained diode
mAnode, strange energy storage inductor L
mThe first end three be connected strange sustained diode
mNegative electrode a, strange metal-oxide-semiconductor Q
mGrid b, strange metal-oxide-semiconductor Q
mSource electrode c, strange energy storage inductor L
mThe second end d.The balanced electronic circuit of idol is by even metal-oxide-semiconductor Q
n, even energy storage inductor L
n, even sustained diode
nForm even metal-oxide-semiconductor Q
nSource electrode, even sustained diode
nNegative electrode, even energy storage inductor L
nThe first end three be connected even metal-oxide-semiconductor Q
nDrain electrode e, even metal-oxide-semiconductor Q
nGrid f, even sustained diode
nAnode g, even energy storage inductor L
nThe second end h.In the discharge process of series battery; Battery management system is according to the dump energy (SOC of each battery in the battery pack; State of Charge), find out dump energy (SOC, State of Charge) battery unit module on the low side; Send balanced instruction to control circuit, control circuit is through the strange metal-oxide-semiconductor Q of strange (idol) the balanced electronic circuit of control
m(even metal-oxide-semiconductor Q
n) turn on and off strange (idol) battery charge that connects to coupled.
Battery management system is that single-chip microcomputer (like C8051F340) is core, generally has functions such as battery status detection, battery status analysis, cell safety protection, energy control and management, battery information management.To different application scenarios, battery management system should have different functions.Said control circuit be embodied as this area routine techniques; Be not content of the present invention, the size of the control signal frequency of its output according to the inductance value of strange (idol) energy storage inductor Lm (Ln) of strange (idol) balanced electronic circuit of being controlled, strange metal-oxide-semiconductor Qm and even metal-oxide-semiconductor Qn, switching loss, battery unit module voltage, battery unit module capacity decide.The duty ratio of the control signal of said control circuit output makes very, and strange (idol) energy storage inductor Lm (Ln) of (idol) balanced electronic circuit resetted in each signal period; The rising of starting from scratch of the electric current of promptly strange (idol) energy storage inductor Lm (Ln) drops to zero at last again.Control circuit is to have the electrical isolation function, like the light-coupled isolation of adopting TLP521-1 or transformer isolation etc., can the control signal that battery management system sends be transferred to and can directly drive strange metal-oxide-semiconductor Q
mWith even metal-oxide-semiconductor Q
nDrive signal.
Among Fig. 2, strange balanced electronic circuit is by strange metal-oxide-semiconductor Q
m, strange energy storage inductor L
m, strange sustained diode
mForm strange metal-oxide-semiconductor Q
mDrain electrode, strange sustained diode
mAnode, strange energy storage inductor L
mThe first end three be connected strange sustained diode
mNegative electrode a, strange metal-oxide-semiconductor Q
mGrid b, strange metal-oxide-semiconductor Q
mSource electrode c, strange energy storage inductor L
mThe second end d.The strange metal-oxide-semiconductor Q of strange balanced electronic circuit
mGrid b connect control circuit, strange metal-oxide-semiconductor Q
mSource electrode c connect negative terminal GND.
Among Fig. 3, the balanced electronic circuit of idol is by even metal-oxide-semiconductor Q
n, even energy storage inductor L
n, even sustained diode
nForm even metal-oxide-semiconductor Q
nSource electrode, even sustained diode
nNegative electrode, even energy storage inductor L
nThe first end three be connected even metal-oxide-semiconductor Q
nDrain electrode e, even metal-oxide-semiconductor Q
nGrid f, even sustained diode
nAnode g, even energy storage inductor L
nThe second end h.The even metal-oxide-semiconductor Q of the balanced electronic circuit of idol
nGrid f connect control circuit, even metal-oxide-semiconductor Q
nDrain electrode e connect anode VCC.
Among Fig. 6, in discharge process, battery management system detects the first strange battery B
1, the second even battery B
4Dump energy (SOC, State of Charge) on the low side, in order to prevent the first strange battery B
1, the second even battery B
4Overdischarge, battery management system sends instruction to control circuit, the control circuit control and the first strange battery B
1The strange balanced electronic circuit S that is connected
1Strange metal-oxide-semiconductor Q
mWith the second even battery B
4The balanced electronic circuit S of idol
4Even metal-oxide-semiconductor Q
nTurn on and off with certain frequency and duty ratio, the frequency of switch and duty ratio are set according to concrete circuit.
When with the first strange battery B
1The strange balanced electronic circuit S that is connected
1Strange metal-oxide-semiconductor Q
mWhen opening, whole even batteries (battery unit module B
2, B
4, B
4, B
8, B
10, B
12, B
14), with the first strange battery B
1The strange balanced electronic circuit S that is connected
1Strange energy storage inductor L
mWith strange metal-oxide-semiconductor Q
mForm the loop, flow through strange energy storage inductor L
mThe electric current rising of starting from scratch, whole even batteries (battery unit module B
2, B
4, B
4, B
8, B
10, B
12, B
14) to strange energy storage inductor L
mCharging, strange energy storage inductor L
mEnergy storage; When with the first strange battery B
1The strange balanced electronic circuit S that is connected
1Strange metal-oxide-semiconductor Q
mDuring shutoff, with the first strange battery B
1The strange balanced electronic circuit S that is connected
1Strange energy storage inductor L
mWith strange sustained diode
m, the first strange battery B
1Form the loop, strange energy storage inductor L
mElectric current through strange sustained diode
mThe first strange battery B is given in afterflow
1Strange energy storage inductor L is flow through in charging
mElectric current descend, when finishing, flow through strange energy storage inductor L to this switch periods
mElectric current drop to zero, strange energy storage inductor L
mReset.
When with the second even battery B
4The balanced electronic circuit S of the idol that is connected
4Even metal-oxide-semiconductor Q
nWhen opening, the second even battery B
4, whole strange battery (battery unit module B
1, B
3, B
5, B
7, B
9, B
11, B
13), with the second even battery B
4The balanced electronic circuit S of the idol that is connected
4Even energy storage inductor L
nWith even metal-oxide-semiconductor Q
nForm the loop, flow through even energy storage inductor L
nThe electric current rising of starting from scratch, the second even battery B
4With all strange battery (battery unit module B
1, B
3, B
5, B
7, B
9, B
11, B
13) to even energy storage inductor L
nCharging, even energy storage inductor L
nEnergy storage; When with the second even battery B
4The balanced electronic circuit S of the idol that is connected
4Even metal-oxide-semiconductor Q
nDuring shutoff, with the second even battery B
4The balanced electronic circuit S of the idol that is connected
4Even energy storage inductor L
nWith even sustained diode
n, the second even battery B
4Form the loop, even energy storage inductor L
nElectric current through even sustained diode
nThe second even battery B is given in afterflow
4Even energy storage inductor L is flow through in charging
nElectric current descend, when finishing, flow through even energy storage inductor L to this switch periods
nElectric current drop to zero, even energy storage inductor L
nReset.This equalizing circuit can guarantee that overdischarge does not appear in each battery unit module in discharge process, improves the unbalanced phenomenon of series battery, improves the active volume of battery pack, reduces the maintenance and the replacing of series battery, prolongs the useful life of battery pack.
Claims (7)
1. series battery equalization discharge circuit based on inductive energy storage; Said series battery comprises the battery unit module that is connected in series more than three; It is characterized in that said discharge equalization discharge circuit comprises the balanced electronic circuit more than three; Each battery unit module all is connected with a balanced electronic circuit separately; Said series battery has anode (VCC) and negative terminal (GND), is separation with a tie point N in the said series battery, and said series battery anode (VCC) is a forward part to the battery unit module between the tie point N; Tie point N is the rear section to the battery unit module between the series battery negative terminal (GND); The most number of battery unit module is Duoed one than the number of rear section battery unit module in the forward part, and the battery unit module of forward part is called strange battery, and the battery unit module of rear section is called even battery; The balanced electronic circuit that is connected with strange battery is called strange balanced electronic circuit, and the balanced electronic circuit that is connected with even battery is called balanced electronic circuit; Forward part series-connected cell unit module is a starting point with tie point N, and series battery anode (VCC) is a terminal point, in order the battery unit module is designated as the first strange battery B
1, the second strange battery B
3, the 3rd strange battery B
5, name in order according to this, the battery unit module that is connected with series battery anode (VCC) is the
Strange battery B
iRear section series-connected cell unit module is a starting point with tie point N, and series battery negative terminal (GND) is a terminal point, in order the battery unit module is designated as the first even battery B
2, the second even battery B
4, the 3rd even battery B
6, name in order according to this, the element cell that is connected with series battery negative terminal (GND) is the
Idol battery B
j, j is a positive even numbers, the anode of said strange battery connects the strange fly-wheel diode (D of strange balanced electronic circuit
m) negative electrode (a), the negative terminal of said strange battery connects the strange energy storage inductor (L of strange balanced electronic circuit
m) second end (d); The anode of said even battery connects the even energy storage inductor (L of the balanced electronic circuit of idol
n) second end (h), the negative terminal of said even battery connects even fly-wheel diode (D
n) anode (g).
2. series battery equalization discharge circuit according to claim 1 is characterized in that, said strange balanced electronic circuit comprises strange metal-oxide-semiconductor (Q
m), strange energy storage inductor (L
m) and strange fly-wheel diode (D
m), strange metal-oxide-semiconductor (Q
m) drain electrode, strange fly-wheel diode (D
m) anode, strange energy storage inductor (L
m) the first end three be connected strange fly-wheel diode (D
m) negative electrode (a), strange metal-oxide-semiconductor (Q
m) grid (b), strange metal-oxide-semiconductor (Q
m) source electrode (c) and strange energy storage inductor (L
m) second end (d) link to each other.
3. series battery equalization discharge circuit according to claim 1 is characterized in that the balanced electronic circuit of said idol comprises even metal-oxide-semiconductor (Q
n), even energy storage inductor (L
n) and even fly-wheel diode (D
n), even metal-oxide-semiconductor (Q
n) source electrode, even fly-wheel diode (D
n) negative electrode and even energy storage inductor (L
n) the first end three be connected even metal-oxide-semiconductor (Q
n) drain electrode (e), even metal-oxide-semiconductor (Q
n) grid (f), even fly-wheel diode (D
n) anode (g) and even energy storage inductor (L
n) second end (h) link to each other.
4. series battery equalization discharge circuit according to claim 1 is characterized in that said battery unit module is lead-acid battery, lithium ion battery, Ni-MH battery or ultracapacitor.
5. series battery equalization discharge circuit according to claim 1 is characterized in that, the strange metal-oxide-semiconductor (Q of said strange balanced electronic circuit
m) grid (b) connect control circuit, strange metal-oxide-semiconductor (Q
m) source electrode (c) connect series battery negative terminal (GND).
6. series battery equalization discharge circuit according to claim 1 is characterized in that, the even metal-oxide-semiconductor (Q of the balanced electronic circuit of said idol
n) grid (f) connect control circuit, even metal-oxide-semiconductor (Q
n) drain electrode (e) connect series battery anode (VCC); Said control circuit is used to control the strange metal-oxide-semiconductor (Q of said strange balanced electronic circuit
m) and the idol balanced electronic circuit even metal-oxide-semiconductor (Q
n) turn on and off.
7. according to the described series battery equalization discharge of claim 1～6 circuit, it is characterized in that said i value is 1～59, the j value is 2～60.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103119954A CN102832666A (en) | 2012-08-29 | 2012-08-29 | Inductive energy storage based series battery pack discharging balancing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103119954A CN102832666A (en) | 2012-08-29 | 2012-08-29 | Inductive energy storage based series battery pack discharging balancing circuit |
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| CN102832666A true CN102832666A (en) | 2012-12-19 |
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|---|---|---|---|
| CN2012103119954A Pending CN102832666A (en) | 2012-08-29 | 2012-08-29 | Inductive energy storage based series battery pack discharging balancing circuit |
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|---|---|---|---|---|
| CN104201731A (en) * | 2014-08-12 | 2014-12-10 | 华南理工大学 | Series connection battery pack two-way charging and discharging equalization circuit based on inductor energy storage |
| CN106208236A (en) * | 2016-08-17 | 2016-12-07 | 合肥国轩高科动力能源有限公司 | The balanced management system of a kind of battery and active equalization control method |
| CN111342152A (en) * | 2020-03-06 | 2020-06-26 | 温州大学 | Composite battery pack equalization circuit |
| CN113311341A (en) * | 2020-12-17 | 2021-08-27 | 延锋伟世通电子科技（南京）有限公司 | EOL offline detection method for CMU (capacitive micro-channel) of automobile battery management system |
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| CN104201731A (en) * | 2014-08-12 | 2014-12-10 | 华南理工大学 | Series connection battery pack two-way charging and discharging equalization circuit based on inductor energy storage |
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| CN111342152A (en) * | 2020-03-06 | 2020-06-26 | 温州大学 | Composite battery pack equalization circuit |
| CN113311341A (en) * | 2020-12-17 | 2021-08-27 | 延锋伟世通电子科技（南京）有限公司 | EOL offline detection method for CMU (capacitive micro-channel) of automobile battery management system |
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Application publication date: 20121219 |