CN103296731B - Zero current switch active equalization circuit of power batteries and implementation method - Google Patents
Zero current switch active equalization circuit of power batteries and implementation method Download PDFInfo
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Abstract
The invention discloses a zero current switch active equalization circuit of power batteries and an implementation method. Zero current switch equalization is performed on the two batteries with maximum voltage differences in a battery pack by utilizing an LC quasi-resonant circuit. The equalization circuit comprises an MCU (Microcontroller Unit), an equalization switching circuit and the LC quasi-resonant circuit. The equalization switching circuit is used for switching the LC quasi-resonant circuit between the batteries under the control of the MCU; the MCU obtains voltages of every power battery with the aid of a voltage acquisition circuit so as to determine a highest battery voltage and a lowest battery voltage and numbers of corresponding batteries, and if a maximum battery voltage difference value is larger than a battery equalization threshold value, the equalization circuit is started; in an equalization state, the MCU controls the equalization switching circuit to cyclically switch the LC quasi-resonant circuit between batteries of the highest voltage and the lowest voltage; and when a switching frequency emitted by the MCU is equal to a natural resonant frequency of an LC, the zero current switch equalization is achieved.
Description
Technical field
The present invention relates to a kind of new-energy automobile power control technology, especially a kind of electrokinetic cell Zero Current Switch active equalization circuit and implementation method.
Background technology
At present, divide dissipative type and the large class of energy non-dissipative type two.Energy dissipation type is by the shunting of discharging to the resistance in parallel of each cell in battery pack, thereby realization is balanced.Energy non-dissipative type circuit adopts electric capacity, inductance as energy-storage travelling wave tube, utilizes common power converting circuit as topology basis, takes to disperse or concentrated structure, realizes unidirectional or two-way charging scheme.
Energy dissipation type circuit structure is simple, but has the problem of energy dissipation and heat management.There is the shortcomings such as circuit structure is complicated, volume is large, cost is high, time for balance is long, high switching loss in energy non-dissipative type circuit.
Chinese invention patent application (application number 201010572115.X) discloses a kind of equalizing resistance that utilizes battery in battery pack monomer has been carried out to balanced circuit, mainly comprises controller, resistance commutation circuit and equalizing resistance.First according to the magnitude of voltage gathering, determine the dump energy of each battery cell, then controlling resistance commutation circuit is in parallel by the equalizing resistance battery cell higher with electric weight, discharges, thereby realize battery cell electric quantity balancing to this battery cell.This circuit is that the mode consuming by energy limits battery cell overtension in fact, is only suitable in static equilibrium, has the problem of energy dissipation and heat management.
Chinese invention patent application (application number 201210595724.6) has proposed a kind of condenser type battery equalizing circuit, and the every two adjacent batteries of this circuit share an electric capacity, and when the electric capacity battery cell higher with voltage is in parallel, battery is to capacitor charging; When the electric capacity battery cell lower with voltage is in parallel, electric capacity charges the battery.Through the charge and discharge of electric capacity, energy transfers to from the higher battery cell of voltage the battery cell that voltage is lower, thereby its voltage is equated.But it is more to work as series-connected cell amount of monomer, needed balanced electric capacity and switch module and drive circuit thereof are more, cause circuit bulky, and when the high and minimum adjacent a plurality of monomer of battery of voltage, the balanced way of this " passing the flower while the drum is beaten ", can reduce balanced efficiency greatly.
Summary of the invention
The object of the invention is for overcoming the problem of inconsistency between battery cell of cannot effectively eliminating in above-mentioned prior art in battery pack, a kind of electrokinetic cell Zero Current Switch active equalization circuit and implementation method are provided, its can real-time judge battery pack in the high and minimum battery cell of voltage, and it is carried out to Zero Current Switch equilibrium, because being all two battery cells for voltage difference maximum in battery pack, each equilibrium carries out peak load shifting, greatly improve balanced efficiency, thereby effectively reduced the inconsistency between battery cell.
For achieving the above object, the present invention adopts following technical proposals:
An electrokinetic cell Zero Current Switch active equalization circuit, comprises microcontroller, and described microcontroller comprises analog-to-digital conversion module, two signal output parts and some universal I/O ends;
Described analog-to-digital conversion module is for converting the voltage signal of voltage collection circuit collection to digital signal, thus definite high and minimum battery cell of voltage;
Described two signal output parts are connected with the input of a multi-channel gating switch respectively, and a plurality of outputs of the multi-channel gating switch respectively input of the switch unit corresponding with each battery cell are connected; Described two signal output parts, for generation of the control signal of a pair of state complementation, are controlled LC quasi-resonance circuit and are switched between two battery cells;
Described universal I/O end is connected with the control input end of multi-channel gating switch; High monomer voltage and battery numbering corresponding to minimum monomer voltage that described universal I/O end is determined for microcontroller described in decoding, control multi-channel gating switch conducting and the pwm signal of described a pair of complementation delivered to respectively to the input of the battery cell correspondence switch unit that voltage is high and minimum; A plurality of described switch units form balanced commutation circuit, the corresponding battery cell setting of each switch unit;
Each switch unit comprises that four drive chip and four metal-oxide semiconductor (MOS) metal tube metal-oxide-semiconductors; Wherein two metal-oxide-semiconductor differential concatenations drain and are connected with the positive pole of battery cell with the one end draining after being connected, and the other end is connected with the positive pole of described LC quasi-resonance circuit; Two other metal-oxide-semiconductor differential concatenation drains and is connected with the negative pole of battery cell with the one end draining after being connected, and the other end is connected with the negative pole of described LC quasi-resonance circuit.
Described control signal is pulse width modulating signal PWM.
An implementation method for electrokinetic cell Zero Current Switch active equalization circuit,
Microcontroller utilizes voltage collection circuit, obtains each monomer voltage of electrokinetic cell, thereby determines high monomer voltage and minimum monomer voltage and corresponding battery cell numbering, if maximum monomer voltage difference is greater than battery balanced threshold value, starts equalizing circuit;
Under equilibrium state, the balanced commutation circuit of microprocessor controls is switched LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage;
When the LC quasi-resonance circuit battery cell the highest with voltage is in parallel, battery cell charges to capacitor C, when the described LC quasi-resonance circuit battery cell minimum with voltage is in parallel, capacitor C is charged to battery cell, thereby realizes the continuous equilibrium of two battery cell voltages;
When the switching frequency sending when microcontroller equals the natural resonance frequency of LC quasi-resonance circuit, realize Zero Current Switch equilibrium, and each equilibrium is all that two battery cells for voltage difference maximum in battery pack carry out peak load shifting, greatly improve balanced efficiency, effectively improved the inconsistency between battery cell.
The present invention utilizes LC quasi-resonance circuit to carry out Zero Current Switch equilibrium to two battery cells of voltage difference maximum in battery pack, and electrokinetic cell equalizing circuit comprises microcontroller (MCU), balanced commutation circuit and LC quasi-resonance circuit, wherein,
Microcontroller (MCU) utilizes voltage collection circuit, obtain each monomer voltage of electrokinetic cell, thereby determine high monomer voltage and minimum monomer voltage and corresponding battery cell numbering, if maximum monomer voltage difference is greater than battery balanced threshold value, start equalizing circuit, under equilibrium state, microcontroller (MCU) is controlled described balanced commutation circuit described LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage is switched, when the LC battery cell the highest with voltage is in parallel, battery cell charges to capacitor C, when the LC quasi-resonance circuit battery cell minimum with voltage is in parallel, capacitor C is charged to battery cell, thereby realize the continuous equilibrium of two battery cell voltages, when the switching frequency sending when described microcontroller especially equals the natural resonance frequency of described LC quasi-resonance circuit, realize Zero Current Switch equilibrium, and each equilibrium is all that two battery cells for voltage difference maximum in battery pack carry out, greatly improved balanced efficiency, effectively improved the inconsistency between battery cell.
Microcontroller comprises analog-to-digital conversion module, two signal output parts and some universal I/O ends.Wherein said analog-to-digital conversion module is for converting the voltage signal of voltage collection circuit collection to digital signal, thus definite high and minimum battery cell of voltage; Described two signal output parts, for generation of the control signal of a pair of state complementation, are controlled described LC quasi-resonance circuit and are switched between two battery cells; High monomer voltage and battery numbering corresponding to minimum monomer voltage that described universal I/O end is determined for microcontroller described in decoding; Described pwm signal is delivered to switch unit corresponding to battery cell that voltage is high and minimum, thereby realize LC quasi-resonance circuit, between the high and minimum battery cell of voltage, switch.
Balanced commutation circuit comprises a plurality of switch units, the corresponding battery cell setting of each switch unit, under the control of described microcontroller, switch unit switches LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage, realizes Zero Current Switch equilibrium.
And two signal output parts of described microcontroller are connected with the input of a multi-channel gating switch respectively, a plurality of outputs of the multi-channel gating switch respectively input of the switch unit corresponding with each battery cell are connected; Described universal I/O end is connected with the control input end of multi-channel gating switch.
Each switch unit further comprises that four drive chip and four metal-oxide semiconductor (MOS) metal tube metal-oxide-semiconductors.Wherein the one end after two metal-oxide-semiconductor differential concatenations (drain electrode is connected with drain electrode) is connected with the positive pole of battery cell, and the other end is connected with the positive pole of described LC quasi-resonance circuit; One end after two other metal-oxide-semiconductor differential concatenation (drain electrode is connected with drain electrode) is connected with the negative pole of battery cell, and the other end is connected with the negative pole of described LC quasi-resonance circuit.
Wherein, above-mentioned control signal is pulse width modulating signal PWM.
And described pulse width modulating signal PWM is further used for driving described switch unit, LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage is switched, and realized Zero Current Switch equilibrium by adjusting the frequency of pwm signal.Described universal I/O end is further used for the high and minimum battery cell numbering of voltage to carry out decoding, controls in real time the different passage outputs of multi-channel gating switch, and pwm signal is delivered to switch unit corresponding to battery cell that voltage is high and minimum.
The invention has the beneficial effects as follows: by means of technique scheme, described microcontroller is according to high monomer voltage and battery cell numbering corresponding to minimum monomer voltage, the input of the corresponding switch unit of battery cell that voltage is high and minimum is delivered to the pwm signal of described a pair of complementation respectively in different passage conductings through IO encoded control multi-channel gating switch, controlling described LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage switches, especially, when the pwm signal frequency sending equals described LC natural resonance frequency, realize Zero Current Switch equilibrium, and each equilibrium is all that two battery cells for voltage difference maximum in battery pack carry out, greatly improved balanced efficiency, effectively improved the inconsistency between battery cell.
Accompanying drawing explanation
Fig. 1 is application principle figure of the present invention;
Fig. 2 be according to the present invention in governor circuit figure;
Fig. 3 be according to the present invention in PWM gating circuit figure;
Fig. 4 be according to the present invention in the balanced commutation circuit figure of LC.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
For cannot effectively eliminating in battery pack the problem of inconsistency between battery cell in correlation technique, as shown in Figure 1, battery management system (BMS) can effectively be eliminated in battery pack the problem of inconsistency between battery cell by technical scheme of the present invention.The present invention proposes, by microcontroller, by voltage collection circuit, gathered the voltage signal of each battery cell, determine the battery cell that voltage is high and minimum and judge whether to meet equilibrium condition, if satisfy condition, the balanced commutation circuit of microprocessor controls is switched described LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage, realize the continuous equilibrium of both voltages, when switching frequency equals LC quasi-resonance circuit resonant frequencies, form quasi-resonance and realize Zero Current Switch equilibrium, and each equilibrium is all two battery cells for voltage difference maximum in battery pack, greatly improved balanced efficiency, thereby effectively reduce the inconsistency between battery cell, and can save volume and the cost of equipment.
Describe embodiments of the invention below in detail.
According to embodiments of the invention, a kind of electric automobile power battery Zero Current Switch active equalization circuit is provided, utilize LC quasi-resonance circuit for example, to carry out Zero Current Switch equilibrium to two battery cells of voltage difference maximum in battery pack (, ferric phosphate lithium cell).
Wherein, microcontroller (MCU) utilizes voltage collection circuit, obtains each monomer voltage of electrokinetic cell, thereby determines high monomer voltage and minimum monomer voltage and corresponding battery cell numbering, if maximum monomer voltage difference is greater than battery balanced threshold value, start equalizing circuit;
Under equilibrium state, microcontroller (MCU) is controlled described balanced commutation circuit described LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage is switched, when the LC battery cell the highest with voltage is in parallel, battery cell charges to capacitor C, when the LC battery cell minimum with voltage is in parallel, capacitor C is charged to battery cell, thereby realizes the continuous equilibrium of two battery cell voltages;
When the switching frequency sending when described microcontroller especially equals the natural resonance frequency of described LC, realize Zero Current Switch equilibrium, and each equilibrium is all that two battery cells for voltage difference maximum in battery pack carry out, greatly improve balanced efficiency, effectively improved the inconsistency between battery cell.
Wherein, microcontroller comprises analog-to-digital conversion module, two signal output parts and some universal I/O ends.Wherein said analog-to-digital conversion module is for converting the voltage signal of voltage collection circuit collection to digital signal, thus definite high and minimum battery cell of voltage; Described two signal output parts, for generation of the control signal of a pair of state complementation, are controlled described LC quasi-resonance circuit and are switched between two battery cells; High monomer voltage and battery numbering corresponding to minimum monomer voltage that described universal I/O end is determined for microcontroller described in decoding.
Balanced commutation circuit comprises a plurality of switch units, the corresponding battery cell setting of each switch unit, under the control of described microcontroller, switch unit switches LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage, realizes Zero Current Switch equilibrium.
Particularly, two signal output parts of microcontroller are connected with the input of a multi-channel gating switch respectively, and a plurality of outputs of the multi-channel gating switch respectively input of the switch unit corresponding with each battery cell are connected; Described universal I/O end is connected with the control input end of multi-channel gating switch.
And each switch unit further comprises that four drive chip and four metal-oxide semiconductor (MOS) metal tube metal-oxide-semiconductors.Wherein the one end after two metal-oxide-semiconductor differential concatenations (drain electrode is connected with drain electrode) is connected with the positive pole of battery cell, and the other end is connected with the positive pole of described LC quasi-resonance circuit; One end after two other metal-oxide-semiconductor differential concatenation (drain electrode is connected with drain electrode) is connected with the negative pole of battery cell, and the other end is connected with the negative pole of described LC quasi-resonance circuit.
Wherein, described control signal is pulse width modulating signal PWM.And described pulse width modulating signal PWM is further used for driving described switch unit, LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage is switched, and realized Zero Current Switch equilibrium by adjusting the frequency of pwm signal.Described universal I/O end is further used for the high and minimum battery cell numbering of voltage to carry out decoding, controls in real time the different passage outputs of multi-channel gating switch, and pwm signal is delivered to switch unit corresponding to battery cell that voltage is high and minimum.
Below in conjunction with Fig. 2 to Fig. 4, describe structure and the operation principle of microcontroller and balanced commutation circuit in detail.
The microcontroller of described equalizing circuit adopts Digital Signal Processing DSP(TMS320F2812) as shown in Figure 2; Multi-channel gating switch is realized as shown in Figure 3 by two CD4051; Metal-oxide-semiconductor drives chip (driving chip) to adopt HCPL_3120 as shown in Figure 4.
DSP(TMS320F2812) as shown in Figure 2, GPIOA0/PWM1 and GPIOA1/PWM2 pin produce pwm signal PWM+ and the PWM-of a pair of complementation, and are connected with the input of two CD4051 analog channels respectively in configuration; GPIOA6～GPIOA13 is as control inputs signal P0～P7 of two CD4051, respectively with its binary system control input end A, B, C and
be connected; Battery voltage sampling signal VBT1～VBT3 access pin ADCINA0～ADCINA2 also carries out high-precision A/D conversion, for the high and minimum battery cell of definite voltage and corresponding battery numbering.
As shown in Figure 3, be the PWM gating circuit of described microcontroller, by two CD4051, realized, CD4051 is single 8 passages numeral control simulation electronic switches, have tri-binary system control input ends of A, B and C and
totally 4 inputs, have low conduction impedance and very low cut-off leakage current.Wherein a slice CD4051 delivers to PWM+ switch unit corresponding to the highest battery cell of voltage under the control of controller DSP GPIOA10～GPIOA13 pin, and another sheet is delivered to PWM-switch unit corresponding to the minimum battery cell of voltage under the control of controller DSP GPIOA6～GPIOA9 pin.
As shown in Figure 4, be described balanced main circuit, by balanced commutation circuit and a LC quasi-resonance the electric circuit constitute.The corresponding switch unit of every batteries monomer wherein, (except head and the tail battery cell) drives chips and four metal-oxide semiconductor (MOS) metal tubes (hereinafter referred metal-oxide-semiconductor) composition by four.Wherein one end source electrode after two metal-oxide-semiconductor differential concatenations (drain electrode is connected with drain electrode) is connected with the positive pole of battery cell, and another source electrode is connected with the positive pole of described LC quasi-resonance circuit; A source electrode after two other metal-oxide-semiconductor differential concatenation (drain electrode is connected with drain electrode) is connected with the negative pole of battery cell, and another source electrode is connected with the negative pole of described LC quasi-resonance circuit.As shown in Figure 4, U1, Q1, D1 and U2, Q2, D2 are to the switch unit for battery cell BT1; U3, Q3, D3, U4, Q4, D4 and U5, Q5, D5, U6, Q6, D6 are to the switch unit for battery cell BT2; U7, Q7, D7 and U8, Q8, D8 are to the switch unit for battery cell BT3.
Wherein the grid of metal-oxide-semiconductor is connected with driving output 6 pins of chip HCPL_3120 by a resistance, drives input 2 pins of chip HCPL_3120 to be connected with the output of multi-channel gating switch CD4051.
Controller DSP carries out voltage acquisition to the battery cell in battery pack, determines high monomer voltage and minimum monomer voltage and corresponding battery numbering, and judges whether to meet balanced unlocking condition, if meet, carries out equilibrium.DSP numbers corresponding battery numbering and battery corresponding to minimum monomer voltage of high monomer voltage, by the decoding of GPIOA6～GPIOA13 pin, PWM+ and PWM-that control CD4051 sends controller DSP respectively deliver to the switch unit that voltage is the highest and minimum battery cell is corresponding, due to two PWM opposite states, LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage is switched.
Suppose that battery cell BT1 voltage is the highest, battery cell BT3 voltage is minimum, and controller DSP is decoded into 0010 GPIOA6～GPIOA9 pin, controls CD4051 U0^ gating x2 road, PWM-is sent to the input that drives chip U7 by CD4051 U0^ x2 road, and driven MOS pipe Q7 switch; GPIOA10～GPIOA13 pin is decoded into 0000, controls CD4051 U0 gating x0 road, PWM+ is sent to the input that drives chip U1 by U0 x0 road, and driven MOS pipe Q1 switch simultaneously.When PWM+ is high level (PWM-is low level), Q1 conducting, from the positive pole of BT1, the drain electrode by Q1 enters LC quasi-resonance circuit to electric current, and by the anti-paralleled diode D2 of the metal-oxide-semiconductor Q2 that connects with BT1 negative pole, gets back to the negative pole of cell BT1, and BT1 charges to capacitor C.When PWM-is high level (PWM+ is low level), Q7 conducting, electric current enters the positive pole of BT3 from the positive pole of LC quasi-resonance circuit by the drain electrode of Q7, and by the anti-paralleled diode D8 of the metal-oxide-semiconductor Q8 that connects with BT3 negative pole, gets back to the negative pole of LC quasi-resonance circuit, and capacitor C is charged to BT3.Thereby realize the equilibrium of BT1 and BT3, when PWM frequency equals the natural resonance frequency of LC quasi-resonance circuit, form quasi-resonance and realize Zero Current Switch equilibrium especially.
In sum, by means of technique scheme of the present invention, LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage is switched.When the LC quasi-resonance circuit battery cell the highest with voltage is in parallel, battery cell charges to capacitor C, when the LC quasi-resonance circuit battery cell minimum with voltage is in parallel, capacitor C is charged to battery cell, thereby realize the continuous equilibrium of two battery cell voltages, when switching frequency equals the natural resonance frequency of L quasi-resonance circuit C, form quasi-resonance and realize Zero Current Switch equilibrium, it is worth mentioning that each equilibrium is all that two battery cells for voltage difference maximum in battery pack carry out, greatly improved balanced efficiency, effectively improved the inconsistency between battery cell, and can save volume and the cost of equipment.
It should be noted that to be only to realize a kind of specific embodiments that LC quasi-resonance switches shown in Fig. 1 to Fig. 3; also can adopt in actual applications other connected mode to be connected to above-mentioned parts, and carry out connected mode change belong to equally protection scope of the present invention.
In addition, except LC quasi-resonance circuit being optionally connected in parallel to certain battery cell by the scheme shown in Fig. 2 to 4, can also reach this object by switch arrays or in conjunction with the mode of other circuit devcies, concrete mode will not enumerate herein.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (2)
1. an electrokinetic cell Zero Current Switch active equalization circuit, is characterized in that, comprises microcontroller, and described microcontroller comprises analog-to-digital conversion module, two signal output parts and some universal I/O ends;
Described analog-to-digital conversion module is for converting the voltage signal of voltage collection circuit collection to digital signal, thus definite high and minimum battery cell of voltage;
Described two signal output parts are connected with the input of a multi-channel gating switch respectively, and a plurality of outputs of the multi-channel gating switch respectively input of the switch unit corresponding with each battery cell are connected; Described two signal output parts, for generation of the control signal of a pair of state complementation, are controlled LC quasi-resonance circuit and are switched between two battery cells;
Described universal I/O end is connected with the control input end of multi-channel gating switch; High monomer voltage and battery numbering corresponding to minimum monomer voltage that described universal I/O end is determined for microcontroller described in decoding, control multi-channel gating switch conducting and the pwm signal of described a pair of complementation delivered to respectively to the input of the battery cell correspondence switch unit that voltage is high and minimum;
A plurality of described switch units form balanced commutation circuit, the corresponding battery cell setting of each switch unit;
Each switch unit comprises that four drive chip and four metal-oxide semiconductor (MOS) metal tube metal-oxide-semiconductors; Wherein two metal-oxide-semiconductor differential concatenations drain and are connected with the positive pole of battery cell with the one end draining after being connected, and the other end is connected with the positive pole of described LC quasi-resonance circuit; Two other metal-oxide-semiconductor differential concatenation drains and is connected with the negative pole of battery cell with the one end draining after being connected, and the other end is connected with the negative pole of described LC quasi-resonance circuit;
Described control signal is pulse width modulating signal PWM, and pwm signal is delivered to switch unit corresponding to battery cell that voltage is high and minimum, thereby realize LC quasi-resonance circuit, between the high and minimum battery cell of voltage, switches.
2. an implementation method for electrokinetic cell Zero Current Switch active equalization circuit as claimed in claim 1, is characterized in that,
Microcontroller utilizes voltage collection circuit, obtains each monomer voltage of electrokinetic cell, thereby determines high monomer voltage and minimum monomer voltage and corresponding battery cell numbering, if maximum monomer voltage difference is greater than battery balanced threshold value, starts equalizing circuit;
Under equilibrium state, the balanced commutation circuit of microprocessor controls is switched LC quasi-resonance circuit loop cycle between the high and minimum battery cell of voltage;
When the LC quasi-resonance circuit battery cell the highest with voltage is in parallel, battery cell charges to capacitor C, when the described LC quasi-resonance circuit battery cell minimum with voltage is in parallel, capacitor C is charged to battery cell, thereby realizes the continuous equilibrium of two battery cell voltages;
When the switching frequency sending when microcontroller equals the natural resonance frequency of LC quasi-resonance circuit, realize Zero Current Switch equilibrium, and each equilibrium is all that two battery cells for voltage difference maximum in battery pack carry out peak load shifting, greatly improve balanced efficiency, effectively improved the inconsistency between battery cell.
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| CN202127255U (en) * | 2011-01-24 | 2012-01-25 | 启明信息技术股份有限公司 | Power battery full-balance controller for electric automobile |
| CN203352230U (en) * | 2013-07-04 | 2013-12-18 | 山东大学 | Zero current switching active equalization circuit of power battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202127255U (en) * | 2011-01-24 | 2012-01-25 | 启明信息技术股份有限公司 | Power battery full-balance controller for electric automobile |
| CN203352230U (en) * | 2013-07-04 | 2013-12-18 | 山东大学 | Zero current switching active equalization circuit of power battery |
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