CN102064569A - Vehicle lithium battery pack equalizing circuit using super capacitor - Google Patents
Vehicle lithium battery pack equalizing circuit using super capacitor Download PDFInfo
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- CN102064569A CN102064569A CN 201010505809 CN201010505809A CN102064569A CN 102064569 A CN102064569 A CN 102064569A CN 201010505809 CN201010505809 CN 201010505809 CN 201010505809 A CN201010505809 A CN 201010505809A CN 102064569 A CN102064569 A CN 102064569A
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Abstract
The invention discloses a series-connected lithium battery pack active equalizing circuit using a super capacitor. The active equalizing circuit comprises more than two equalizing units, wherein each equalizing unit comprises a single battery and an equalizing circuit; every two adjacent equalizing units are connected in series in the following modes: a first equalizing circuit is connected in parallel with a first single battery; the first equalizing circuit comprises a first P channel MOSFET pipe and a first N channel MOSFET pipe; drain electrodes of the two MOSFET pipes are connected with each other; gate poles of the two MOSFET pipes are connected with each other and are connected with an external circuit through a first signal input end; source electrodes of the first MOSFET pipe and the second MOSFET pipe are connected in parallel with two ends of positive and negative poles of the first single battery respectively; the two ends of the positive and negative poles of the first single battery are connected with the external circuit through a first signal output end and a second signal output end respectively; the positive pole of a second single battery is connected with the negative pole of the first single battery; and a second equalizing circuit and the first equalizing circuit connected in parallel with two ends of the second single battery have the same structure.
Description
Technical field
The present invention relates to initiatively equalizing circuit of a kind of power train in vehicle application lithium battery group, be suitable for the balanced and protection of automobile-used dynamic lithium battery group such as electric bicycle, battery-operated motor cycle, hybrid vehicle, pure electric vehicle.
Background technology
Hyundai Motor is to the irreplaceable huge impetus of progressive generation of human society.But along with a large amount of productions of automobile be extensive use of, also brought the severe problem of aspects such as environment, the energy.In this case, the development electric automobile becomes an important solution route.National governments have also given to support energetically to the research and development and the industrialization of electric automobile.In China country " 863 " in the works, electric motor car has been listed in the special problem of great tackling key problem.Take all factors into consideration the development trend of reliability, fail safe, resource and environment problem and the battery performance of battery, lithium rechargeable battery is because operating voltage height, volume are little, light weight, memory-less effect, pollution-free, plurality of advantages such as self discharge is little, have extended cycle life, be a kind of ideal power power supply, thereby become the first-selection of electric vehicle electrokinetic cell.
The voltage of single lithium battery and finite capacity need a plurality of cells of series and parallel to form battery pack and use during actual power battery of electric vehicle is used.Significant problems such as but there is inconsistency in the cell in the battery pack because of various subjective and objective factors, and this has just caused the fail safe of some battery pack low, useful life is short.Improve the useful life of dynamic lithium battery group, improve the stability of system and reduce cost, it is the key that addresses this problem that battery pack is carried out efficient balance.
The balancing procedure of battery pack is actually the equilibrium of battery charge state (SOC), and from the relation curve of battery SOC and cell voltage and static, dynamic analysis as can be known, electric voltage equalization is very effective to the SOC equilibrium of lithium ion battery, can reach the effect of SOC equilibrium by electric voltage equalization, thereby improve the useful life of battery pack.Theoretic equalization methods is a lot, and wherein the shunt resistance equalization methods is considered to the most practical most economical a kind of method at present.And the equalization methods of large-capacity battery pack also requires that loss is little, efficient is high, safe and reliable, be easy to use etc.In the present lithium ion battery Equilibrium Research field, energy shifts the scheme of I type and energy transfer II type can be considered to use because of it has higher efficient, but these schemes all need the switching device and the support of energy storage device more efficiently of the good low pressure drop of switching characteristic.Along with the continuous development of electronic devices and components, the energy transfer equalization scheme can be applied in the large-capacity battery pack series connection equilibrium.
Conventional switching capacity equalization methods in the nineties in last century just the someone propose, but be limited at that time technology and device condition, obtain not realizing preferably always, its main cause one is huge switch matrix and extremely complicated logical operation, the 2nd, the capacity of common electric capacity (general electrochemical capacitor etc.) is less, equilibrium is an utterly inadequate amount for battery electric quantity as the energy transfer vector, can't accomplish big electric current fast uniform, the 3rd, general switching device (transistor, CMOS pipes etc.) switch performance is bad, cause in the equilibrium energy loss bigger, the virtual earth of being exactly technical limitations is arranged again, the voltage measurement matrix of cell is huge, circuit is realized difficulty, or the like.In recent years, along with the commercialization of super capacitor (also claiming capacitor batteries) and the reduction of cost, make that super capacitor has obtained at aspects such as energy storage widely using, as energy storage units, super capacitor is discharging and recharging, is having very big advantage aspect the energy density; Power field effect pipe (Power MOSFET) is a kind of voltage control device of one pole type, self-switching-off capability is not only arranged, and have driving power little, characteristics such as switching speed height, no second breakdown, safety operation area are wide, its function admirable is particularly suitable for as switching device.Each IC device company has released integrated voltage monitoring IC product, LTC6802 as Linear Techn Inc. (Linear), the AD7280 of ADI company, like the ATA6870 of special Mel (Atmel) company, IC products such as the DS2726 of U.S. letter (MAXIM) and Max11068 make the realization of intelligent battery group balance policy that possibility arranged.The appearance of these integrated devices is to concentrate within nearest 1 year to take place, and this shows that the electric motor car Vehicular dynamic battery has become the research focus of current industrial circle and scientific research circle.
From the Vehicular dynamic battery industrial chain, battery balanced and resist technology remains the focus of current research, has vast market prospect and using value.In the last few years, numerous personages of scientific research circle both at home and abroad, industrial circle had done many-sided exploration to this problem, and had proposed a lot of valuable theories and reference.The domestic and international patent of this respect mainly contains: US5886502, US6114835, US6278604, US6356055, US6844703, US7279867, US7609031, US20040032236, US20050077875, US20050269989, US20080018299, US20090167243, CN2814766, CN101183798, CN2899130, CN101262138, CN1449085 etc.Super capacitor is suitable for being applied in the automobile-used lithium battery equalizing circuit as the newborn device of industrialization in nearest 5 years.Do not report at present based on the present patent of the balancing technique of super capacitor.Traditional switching capacity equalization methods is not widely used because being subjected to the restriction of the various switch matrix of quantity, and the present invention adopts up-to-date device and the reasonably dynamic active equilibrium of switch control realization lithium battery group, and industrialization prospect is better.
Summary of the invention
The purpose of this invention is to provide a kind of automobile-used lithium battery group equalizing circuit that uses super capacitor, dynamically initiatively balanced to realize the switching capacity method.
For achieving the above object, the technological means that the present invention adopts is: a kind of serial lithium battery group active equalizing circuit that uses super capacitor, comprise two above balanced units, and each balanced unit comprises cell and equalizing circuit; Wherein, every adjacent two balanced units are connected in the following manner:
First equalizing circuit is in parallel with first cell, and this first equalizing circuit comprises a P channel mosfet pipe Q
1With first N-channel MOS FET pipe Q
2, the drain electrode of described two MOSFET pipes links to each other; The gate pole of described two MOSFET pipes links to each other, and by the first signal input part S
nBe connected with external circuits, in order to receive the switch controlling signal of external circuits input; The source electrode of the described first and second MOSFET pipes is connected in the positive and negative end of described first cell respectively in parallel; The positive and negative end of described first cell is also respectively by the first and second signal output part C
n, C
N-1Be connected to external circuits, in order to export differential signal to external circuits, this differential signal is the voltage signal of actual first cell;
The positive pole of second cell links to each other with the negative pole of above-mentioned first cell; Second equalizing circuit that is connected in parallel on these second cell two ends is identical with the described first equalizing circuit structure, wherein, the first N-channel MOS FET that the source electrode of the 2nd P channel mosfet pipe that is connected with the positive pole of this second cell links to each other with the above-mentioned first cell negative pole by common node manages the source electrode of the utmost point, and described second cell and the shared voltage signal output end of described first cell;
The drain electrode of described first, second balanced unit links to each other by super capacitor.
Be parallel with voltage stabilizing didoe D at the two ends of described cell
1, D
2
Between the positive pole and signal input end of cell, also be provided with voltage stabilizing didoe D
3, D
4, its positive pole is connected with the positive pole of cell, and its negative pole is by shunt resistance R
2, R
4With described signal input end S
n, S
N-1Connect.
Described the 2nd P channel mosfet pipe and described first N-channel MOS FET pipe gate pole Q
2Or Q
4The position can exchange.
Above-mentioned MOSFET adopts power-type MOSFET pipe.
The switch controlling signal frequency of described external circuits input can be between 0.1～20Hz, and duty cycle of switching is between 30%-70%.
The capacity of described super capacitor is between 0.68F～50F.
Realization of the present invention possesses simple circuit, logic control clearly, stable operating loop, and cost can be controlled.
Description of drawings
Fig. 1 is a unit of the present invention equalizing circuit schematic diagram;
Fig. 2 is the drive waveforms schematic diagram of drive circuit output of the present invention;
Fig. 3 is 2 joint portfolio effect figure of the present invention;
Fig. 4 is 8 batteries portfolio effect figure of the present invention;
Embodiment
With reference to Fig. 1, be unit of the present invention equalizing circuit schematic diagram, among the figure:
C
A, C
B2 joint cells for series connection; C
ANegative pole connect the positive pole of CB; Q
1, Q
3Be power-type P-MOSTFET pipe, Q
2, Q
4Be power-type N-MOSTFET pipe; D
1, D
2, D
3, D
4Be Zener diode; R
1～R
5Be resistance; C
n, C
N-1, C
N-2Be the voltage measurement signal output port, to external circuits output differential signal, this differential signal is the voltage signal of actual first cell; S
n, S
N-12 adjacent outputs for external control circuit.
At each cell C
A, C
BThe positive and negative electrode two ends respectively and connect equalizing circuit.In equalizing circuit, a P channel mosfet pipe Q
1Gate pole and N-channel MOS FET pipe Q
2Gate pole connect, same, Q
3With Q
4Gate pole connect, at Q
1With Q
2Between and Q
3With Q
4Between respectively the common gate utmost point connect, it is right to form 2 bidirectional switchs.Q1 and Q
2Source electrode be connected in parallel to cell C again respectively
AThe positive and negative electrode two ends; Equally, Q
3With Q
4Source electrode be connected in parallel to cell C again respectively
BThe positive and negative electrode two ends; Q
2With Q
3Source electrode at cell C
BPositive pole one end, link to each other by common node.C
1Be super capacitor as the energy buanch unit, C
1One end is connected in Q
1, Q
2Drain electrode, the other end is connected in Q
3, Q
4Drain electrode.The positive and negative end of battery is respectively by output C
n, C
N-1, C
N-2, to external circuit output differential signal, this differential signal is the voltage signal of cell, respectively with cell C
APositive pole, negative battery voltage and cell C
BPositive pole, negative battery voltage export to external circuit, wherein, C
ANegative pole and C
BThe cathode voltage value be identical.S
n, S
N-1Be two control signal output ends independently separately in the external circuits, the high-low level of its control logic corresponds respectively to C
N-1, C
N-2The differential level of terminal voltage level is connected with the gate pole of two MOSFET pipes respectively successively, and to its output control signal, control Q
1～Q
4Conducting, close.
Voltage stabilizing didoe D
1, D
2In the balanced unit circuit respectively with cell C
A, C
BIn parallel.And with cell C
A, C
BIt is similar to connect, voltage stabilizing didoe D
1Positive pole and D
2Negative pole series connection.Voltage stabilizing didoe D
3, D
4Be connected to battery C
A, C
BPositive pole and signal input end S
n, S
N-1Between, and between its negative pole and signal input end, be in series with resistance R
2And R
4, D
1～D
4, R
2And R
4For the balanced unit circuit provides protection.
C
2, C
3Be filter capacitor, be connected to the differential voltage signal input C of external circuits
n, C
N-1Between and C
N-1, C
N-2Between.C
2, R
1With C
3, R
3Differential voltage signal is played anti-aliasing effect, increase measuring accuracy.
In the active equalizing circuit among above-mentioned Fig. 1, work as S
n, S
N-1During for high level, Q
2, Q
4Conducting, Q
1, Q
3End, at this moment C
1Cross-over connection is in C
BTwo ends; If work as S
n, S
N-1During for low level, Q
1, Q
3Conducting, Q
2, Q
4End, at this moment C
1Cross-over connection is in C
ATwo ends.
The measurement of voltage adopts special-purpose battery detecting technology to realize by external circuits, handles, compares through external processor, again according to up, descending or fuzzy control strategy, exports pulse switch signal by Sn, Sn-1 port to equalizing circuit.The external circuits integrated circuit (IC) that can realize this function has: the LTC6802 of Linear Techn Inc. (Linear), the AD7280 of ADI company, like the ATA6870 of special Mel (Atmel) company, the DS2726 and the Max11068 of U.S. letter (MAXIM), the OZ890 of concavo-convex science and technology (O2Micro), IC products such as the semi-conductive Intersil9216/9217 of Intersil (Intersil).Also can adopt the analog-to-digital conversion mode of difference input to gather each cell voltage, but because of integrated level is low, realize complicatedly, be optimal selection with integrated IC under the actual cost permission situation.
By the voltage measurement signal output port C among the figure
n, C
N-1, C
N-2Battery detecting module in above-mentioned external circuits is exported the extreme voltage of each self-metering battery respectively, and IC judges via battery detecting, if C
AVoltage is less than C
BVoltage passes through S earlier
n, S
N-1Port output high-level control signal makes Q
2, Q
4Conducting, C
1Cross-over connection is in C
BTwo ends, this moment capacitor C
1By battery C
BCharging; After charging after a while, S
n, S
N-1Port output low level control signal makes Q
2, Q
4End Q
1, Q
3Conducting, C
1Cross-over connection is in C
ATwo ends, this moment electric capacity to C
ADischarge.Charging a period of time described here is to instigate circuit to reach time of stable state again, can calculate according to Theory of Circuit Analysis and know, if Q
2Conducting resistance be 50m Ω, when C was 1F, this section period should be for greater than 5*50m Ω * 1F=250ms.On the contrary, C
AVoltage is greater than C
BUnder the voltage condition, control S
n, S
N-1The output low level control signal makes Q
1, Q
3Conducting, C
1Cross-over connection is in C
ATwo ends, this moment capacitor C
1Be in charged state, through after one section charging, make circuit reach stable state again equally, Sn, Sn-1 port output high-level control signal make Q
1, Q
3End Q
2, Q
4Conducting, C
1Cross-over connection is in C
BTwo ends, this moment electric capacity to C
BDischarge.Like this, adopt super capacitor as the energy delivery carrier, through several times S
n, S
N-1Repetitive operation can realize electric charge from the transfer of high voltage cell to the low-voltage cell, thereby reach by the balancing energy of super capacitor to battery pack.
Equalizing circuit of the present invention is based on the equilibrium of super capacitor, so-called super capacitor is as is known to the person skilled in the art, and the common capacitor of its Capacity Ratio is much bigger, owing to its capacity is very big, externally performance is identical with battery, therefore also has to be called " capacitor batteries ".The super capacitor that the present invention adopts is button-shaped electric capacity or column type electric capacity or other novel farad capacitor, and according to the capacity requirement of automobile-used lithium battery group, the capacity of super capacitor is between 0.68F～50F.
Adopt the node of MOSFET management and control system diverter switch super capacitor among the present invention, realize equilibrium control, can realize the euqalizing current of big electric current based on the electric charge transfer.N-MOSFET and P-MOSTFET take common gate utmost point connected mode to form a bidirectional switch in the balanced unit, and common gate utmost point connected mode can reduce the switch matrix scale of one times ordinary tap capacitance method.Above-mentioned MOSFET adopts power-type MOSFET pipe.N-MOSFET in bidirectional switch and the drain electrode of P-MOSTFET interconnection, i.e. Q in the preferred implementation
1, Q
2The interconnected or Q of drain electrode
3, Q
4Drain electrode interconnected, a pole plate tie point as super capacitor, the bidirectional switch of two serial connections, the drain electrode that just comprises two N-MOSFET and two P-MOSTFET power switch pipes just can be respectively as two each and every one electrode tie point, i.e. Q in the preferred implementation as the super capacitor of energy carrier
1, Q
2Drain electrode and Q
3, Q
4Drain electrode respectively as the electrode tie point of capacitor C 1.
The bidirectional switch that the N-MOSFET of the common gate utmost point and P-MOSTFET form, on conduction mode, two MOSFET pipes are interlockings, make switching logic comparatively simple with control.MOSFET has the lower conduction impedance that is lower than 60m Ω, and impedance can reach 10 between gate pole and the drain electrode
9Ω has good switch performance.Because the control of the switch of MOSFET pipe is voltage-type, so available general Transistor-Transistor Logic level signal controlling, this makes that equalizing circuit provided by the invention can be compatible mutually with current common single-chip microcomputer and peripheral circuit thereof.
Equalizing circuit provided by the invention can be realized making the oriented transmission of electric energy between different batteries by the switch of 2 MOSFET pipes of a switching signal control.Because two MOSFET of common gate utmost point pipe: between Q1 and the Q2 or the action between Q3 and the Q4 be interlocking, significantly reduced the number of switches of conventional method switch arrays thus.
Be applied to S
n, S
N-1Pulse signal can adopt program control by external circuits, the switch of equalizing circuit control frequency is controlled by external circuits with duty ratio and is finished, this circuit controling switch frequency can be between 0.1～20Hz, duty cycle of switching is between 30%-70%.Because (i ∈ 1～n) end is respectively independently to each Si, can asynchronously operate, and also can use the lock-out pulse method, or adopt other control algolithms.
As shown in Figure 2, be that this waveform of drive waveforms schematic diagram of typical drive circuit output is the 1Hz square wave, amplitude 5V, duty ratio is 50%.Export the square wave drive waveform simultaneously to S with program
n, S
N-1, two adjacent among Fig. 1 batteries are carried out equilibrium, can realize fast initiatively portfolio effect.
As shown in Figure 3, be that equalizing circuit provided by the invention carries out balanced design sketch to two cells that save different initial voltages.The initial voltage value of this two batteries is about 4V and 3.1V respectively.The monomer battery voltage of two joint serial connections promptly reaches the equilibrium point in 4000 milliseconds of times, when balanced, these two monomer battery voltage differences are less than 30mV.Because power-type MOSFET pipe is the voltage-controlled type switching device, when voltage difference between battery was big, available euqalizing current was bigger, shifted so can realize the energy of big electric current rapidly.
On equalizing circuit provided by the invention basis, can realize equalization algorithm flexibly, reach the purpose of big electric current fast uniform.Common battery balanced strategy (algorithm) has up equalization, equalization methods such as descending equilibrium, average equilibrium and fuzzy control intelligent algorithm.Do not taking under the equalization algorithm situation of above-mentioned complexity, the present invention still can realize comparatively desirable balanced regulatory function.
A simple equalization algorithm is the lock-out pulse method, and this method is to adopt external circuit to produce as shown in Figure 2 synchronizing pulse train to S
1～S
nEach port, realize the timing conducting of each MOSFET pipe and close.As shown in Figure 4, the cell that 8 joints are serially connected, the initial voltage of this cell is followed successively by 3.6V, 3.69V, 3.79V, 3.88V, 3.99V, 4.09V, 4.19V and 4.26V, and the maximum voltage difference is 0.66V between the monomer, and the average voltage difference is 0.1V.Use equalizing circuit provided by the invention and take and carry out balanced design sketch under the situation of above-mentioned lock-out pulse method to the series connection of eight batteries, through after the balanced action of several times, the voltage maximum difference is less than 30mV between monomer in 25000 milliseconds time.
Equalizing circuit of the present invention can realize expanding to more piece easily, is example with the series connection of eight batteries here, for power train in vehicle application lithium battery in the prior art, may reach the serial connection situation of 100 joints.Invention is selecting can to realize infinite expanding in theory under the suitable power device situation.In actual applications, can be applicable to maximum serial connection voltage is during the following electric motor car electrical source of power of 1000V is used.
Realization of the present invention possesses simple circuit, logic control clearly, stable operating loop, and cost can be controlled.As mentioned above, be preferred embodiment of the present invention, and the non-limiting scope of application of the present invention.Those skilled in the art can do certain revision and improvement outside limited range of the present invention.
Claims (7)
1. a serial lithium battery group of using super capacitor equalizing circuit initiatively, it is characterized in that: this circuit comprises two above balanced units, and each balanced unit comprises cell and equalizing circuit; Wherein, every adjacent two balanced units are connected in the following manner:
First equalizing circuit is in parallel with first cell, and this first equalizing circuit comprises a P channel mosfet pipe (Q
1) and first N-channel MOS FET pipe (Q
2), the drain electrode of described two MOSFET pipes links to each other; The gate pole of described two MOSFET pipes links to each other, and by the first signal input part (S
n) be connected with external circuits, in order to receive the switch controlling signal of external circuits input; The source electrode of the described first and second MOSFET pipes is connected in the positive and negative end of described first cell respectively in parallel; The positive and negative end of described first cell is also respectively by the first and second signal output part (C
n, C
N-1) be connected to external circuits, in order to export differential signal to external circuits, this differential signal is the voltage signal of actual first cell;
The positive pole of second cell links to each other with the negative pole of above-mentioned first cell; Second equalizing circuit that is connected in parallel on these second cell two ends is identical with the described first equalizing circuit structure, wherein, the first N-channel MOS FET that the source electrode of the 2nd P channel mosfet pipe that is connected with the positive pole of this second cell links to each other with the above-mentioned first cell negative pole by common node manages the source electrode of the utmost point, and described second cell and the shared voltage signal output end of described first cell;
The drain electrode of described first, second balanced unit links to each other by super capacitor.
2. the serial lithium battery group of use super capacitor according to claim 1 is equalizing circuit initiatively, it is characterized in that, is parallel with voltage stabilizing didoe (D at the two ends of described cell
1, D
2).
3. the serial lithium battery group of use super capacitor according to claim 1 is equalizing circuit initiatively, it is characterized in that, between the positive pole and signal input end of cell, also is provided with voltage stabilizing didoe (D
3, D
4), its positive pole is connected with the positive pole of cell, and its negative pole is by shunt resistance (R
2, R
4) and described signal input end (S
n, S
N-1) connect.
4. the serial lithium battery group of use super capacitor according to claim 1 is equalizing circuit initiatively, it is characterized in that described the 2nd P channel mosfet pipe and described first N-channel MOS FET pipe gate pole (Q
2Or Q
4) the position can exchange.
5. the serial lithium battery group of use super capacitor according to claim 1 is equalizing circuit initiatively, it is characterized in that, above-mentioned MOSFET adopts power-type MOSFET pipe.
6. the serial lithium battery group of use super capacitor according to claim 1 is equalizing circuit initiatively, it is characterized in that, the switch controlling signal frequency of described external circuits input can be between 0.1～20Hz, and duty cycle of switching is between 30%-70%.
7. the serial lithium battery group of use super capacitor according to claim 1 is equalizing circuit initiatively, it is characterized in that the capacity of described super capacitor is between 0.68F～50F.
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|---|---|---|---|
| CN 201010505809 CN102064569A (en) | 2010-10-11 | 2010-10-11 | Vehicle lithium battery pack equalizing circuit using super capacitor |
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|---|---|---|---|
| CN 201010505809 CN102064569A (en) | 2010-10-11 | 2010-10-11 | Vehicle lithium battery pack equalizing circuit using super capacitor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103181053A (en) * | 2011-10-24 | 2013-06-26 | 丰田自动车株式会社 | Electricity-storage system |
| CN105429194A (en) * | 2015-10-12 | 2016-03-23 | 丹东思诚科技有限公司 | Series-connected lead acid battery pack equalization circuit and application thereof |
| CN109904899A (en) * | 2018-10-10 | 2019-06-18 | 北京动力京工科技有限公司 | A kind of active equalization of battery device containing forward converter |
-
2010
- 2010-10-11 CN CN 201010505809 patent/CN102064569A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103181053A (en) * | 2011-10-24 | 2013-06-26 | 丰田自动车株式会社 | Electricity-storage system |
| CN103181053B (en) * | 2011-10-24 | 2014-11-12 | 丰田自动车株式会社 | Electricity-storage system |
| CN105429194A (en) * | 2015-10-12 | 2016-03-23 | 丹东思诚科技有限公司 | Series-connected lead acid battery pack equalization circuit and application thereof |
| CN109904899A (en) * | 2018-10-10 | 2019-06-18 | 北京动力京工科技有限公司 | A kind of active equalization of battery device containing forward converter |
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Application publication date: 20110518 |