CN106160093A - Improve method and the circuit of bypass equilibrium effectiveness - Google Patents
Improve method and the circuit of bypass equilibrium effectiveness Download PDFInfo
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- CN106160093A CN106160093A CN201610594611.2A CN201610594611A CN106160093A CN 106160093 A CN106160093 A CN 106160093A CN 201610594611 A CN201610594611 A CN 201610594611A CN 106160093 A CN106160093 A CN 106160093A
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- voltage
- joint
- bypass
- charging
- threshold
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A kind of improvement that the present invention provides bypasses method and the circuit equalizing effectiveness, simplifies the design of the battery joint part-time timesharing equalizing circuit when close being full of and relaxes the cooperation requirement of charger, decreasing the balanced operation time simultaneously.The method of the present invention is: during the set of cells forming the cell joint being connected in series is charged, when charging is close to when being full of, set m the voltage threshold being stepped up, certain voltage threshold in described m voltage threshold is designated as i-th voltage threshold, a highest voltage threshold correspondence joint maximum charging voltage；Bypass equilibrium it is switched on when reaching i-th voltage threshold at certain joint or some batteries voltage, if i-th threshold voltage is not joint maximum charging voltage, while equilibrium, then keep charging, only when i-th threshold voltage reaches to save maximum charging voltage, the charge closing passage when equilibrium.
Description
Technical field
The present invention relates to technical field of battery management, particularly relate to a kind of method improving bypass equilibrium effectiveness and electricity
Road.
Background technology
In various types of battery applications, battery series connection is the most universal a kind of application process.Battery series connection application
The greatest problem brought is exactly the equalization problem between single battery.Battery balanced make every batteries in series battery
Full level is consistent, thus ensures that every batteries can be filled with, or makes every batteries in series battery all be able to fully
Electric discharge.In series battery, either charging or electric discharge, the operating current of each battery is all identical, but due to electricity
There are differences between the individuality of pond, the charging and discharging in series battery is respectively by being filled to the one of the highest license voltage at first
Joint and the restriction saved discharging into minimum license charging voltage at first.In series battery, it is filled with the quantity of electric charge one of each joint
Causing, the charge capacity that this quantity of electric charge is saved by ceiling voltage one determines.In terms of coulomb loss phenomenon, this will cause every 1C (coulomb)
Charge and discharge, the voltage of remaining battery reduces about 30mV～50mV.The i.e. battery charging and discharging voltage of this phenomenon breaks up.This phenomenon causes
The charging/discharging voltage scope gradually step-down of low voltage battery in series battery use, and final because it is close to minimum electric discharge
Voltage makes set of cells effectively to use.Relative to single battery capacity volume variance, effectively using of set of cells is had by voltage differentiation
Bigger impact.In order to extend the life-span of set of cells, need to solve well the equalization problem between single battery in set of cells, electricity
The principle of pond equilibrium is to make the single battery in series battery be maintained at an equilibrium state, mainly with the end electricity of single battery
Whether pressure equalizes (identical) is used as the basis for estimation of whole battery pack balancing degree.At present, battery pack balancing scheme mainly has
The bypass balanced way of energy consumption type and the transfer balanced way two kinds of non-energy consumption type.Bypass equilibrium is through introducing certain side
Road electric current reduction is filled with the electric current of high-voltage battery or makes the way of the many electric discharges of high-voltage battery, reduces its voltage and makes itself and its
The balanced way that its battery is consistent.Transfer equilibrium be exactly the electric charge that higher for voltage battery is saved or stored energy transfer to voltage relatively
The balanced way of low battery.Relative to bypass equilibrium, transfer equilibrium has higher efficiency.
Although bypass equilibrium has more high energy efficiency not as transfer equilibrium, can not make full use of as transfer equilibrium
Battery capacity, but it can stop ability and its simplicity that cell voltage breaks up and economy to make it in charging generation effectively
The applied environment that valency is low is still most suitably used scheme.Further see, owing to difference and the voltage differentiation of battery are one
Process slowly, through the battery of overcapacity preliminary election coupling, as long as occurring without differentiation, energy storage difference is less, transfer equalizing circuit
Conversion efficiency needs are at a relatively high could effectively be utilized；That is the occasion and the charging efficiency that utilize except used batteries also require that severe
Outside the occasion carved, bypass equilibrium is the most competitive.
In prior art, the bypass equalization scheme of the bq77pl900 of TI company is that charging is measured close to timesharing when being full of
And equalization scheme, its Activity design includes: 1. measure and find that certain joint or some batteries reach stopping charging during ceiling voltage,
The joint reaching ceiling voltage is bypassed electric discharge；The most again measure, save, to reaching ceiling voltage, the joint stopping continuing electric discharge, being less than
Electric discharge；Wherein, if two adjacent joints have all reached ceiling voltage: a) once only to an adjacent high voltage joint electric discharge；b)
Next circulation is to the joint electric discharge of another high voltage；3. circulation repeats such as to find that all joint, less than ceiling voltage, restarts and fills
Electricity.Maintain the circulation of 1～3 until outside stopping is charged always.
Such scheme there is problems of, and 1. as described in 1, the program only starts side when there being battery joint to reach ceiling voltage
Road equalizes, and stops charging when connecting bypass；This design can ensure that and uses little electric current that big set of cells also can complete equilibrium,
But the time recovering charging after starting equilibrium is limited by bypass discharge capability, can not be rapidly completed electric discharge blood pressure lowering, charging speed
Spend the most slack-off.2. such as 2.a) and 2.b) as described in, adjacent high voltage joint gradually electric discharge algorithm is complicated, is unfavorable for simple realization.3.
Have can not trigger when the error of charge power supply voltage shows as charge power supply less than the summation of the joint ceiling voltage of equalizing circuit
Equilibrium possibility, maybe cannot realize equilibrium, or when charge power supply voltage higher than joint ceiling voltage summation time may judge less than
Charging complete.The present invention utilizes different Activity design to do specific aim improvement to above-mentioned 3.
Summary of the invention
The present invention is directed to the defect that prior art exists, it is provided that a kind of method improving bypass equilibrium effectiveness and circuit,
Simplify the design of the battery joint part-time timesharing equalizing circuit when close being full of and relax the cooperation requirement of charger,
The balanced operation time can be reduced simultaneously.
The technical scheme is that
1. the method improving bypass equilibrium effectiveness, it is characterised in that to the cell joint group being connected in series
During the set of cells become is charged, when charging close to when being full of, setting m the voltage threshold being stepped up, described m is individual
Certain voltage threshold in voltage threshold is designated as i-th voltage threshold, and a highest voltage threshold correspondence saves high charge electricity
Pressure；Bypass equilibrium it is switched on when reaching i-th voltage threshold at certain joint or some batteries voltage, if i-th voltage threshold
It not joint maximum charging voltage, then while equilibrium, keep charging, only reach to save maximum charging voltage at i-th voltage threshold
Time, the charge closing passage when equilibrium.
2. said method comprising the steps of:
First described cell joint is divided into odd indexed group and even number sequence number group two groups by sequence sequence number；
1) measure the voltage of described cell joint, when measuring, update the parity of pendulous frequency counting every time；
2) battery joint and the sequence number of described battery joint of had more than i-th voltage threshold are recorded；
3) consistent with the odd even of measurement count, to the battery exceeding i-th voltage threshold to the odd even of battery joint sequence number
Joint connects bypass equalization discharge；If i-th voltage threshold is not joint maximum charging voltage, do not stop charging；If i-th is electric
Pressure threshold value is joint maximum charging voltage, stops charging；
4) repeat 1)～3) circulation, until all cell voltages exceed i-th voltage threshold；
5) if i-th voltage threshold is closest to save a lower threshold voltage of maximum charging voltage, report charging
When completing, stop equilibrium；If i-th voltage threshold is not closest to the threshold voltage of the highest joint charging voltage, then it is increased to
Next higher threshold voltage, continues repetition 1)～3) circulation.
3. step 3 described in) in, if i-th voltage threshold is not joint maximum charging voltage, but less than predetermined jth
Voltage threshold, does not stop charging, does not the most adjust the dutycycle of charge tunnel conducting；If i-th voltage threshold be not save the highest
Charging voltage, but higher than predetermined jth voltage threshold, does not stop charging, but adjusts the dutycycle of charge tunnel conducting to 1/n
Or certain small percentage, the ON time of small scale is i.e. only opened in each front portion measuring circulation.
4. step 3 described in) in, adjust the dutycycle of charge tunnel conducting to 1/8.
5. the circuit improving bypass equilibrium effectiveness, it is characterised in that include the cell joint that N joint is connected in series
The set of cells of composition, and N+1 bypass resistance Rb (0) ..., Rb (N) and N number of by-pass switch K (0) ..., K (N-1)；
The negative pole of the first joint cell of described set of cells connects the moved end of by-pass switch K (0), minor details list by bypass resistance Rb (0)
The positive pole of body battery connects the not moved end of by-pass switch K (N) by bypass resistance Rb (N)；The negative pole of the n-th batteries and (n-1)th
The positive pole of batteries connects moved end and the not moved end of K (n-1) of by-pass switch K (n), the n-th economize on electricity by bypass resistance Rb (n-1)
The positive pole in pond and the negative pole of the (n+1)th batteries connect not moved end and the K (n+1) of by-pass switch K (n) by bypass resistance Rb (n)
Moved end；When set of cells charging is close to when being full of, sets m the voltage threshold being stepped up, and carry out measurement count, work as measurement
When the odd even of counting is consistent with the odd even of the battery joint sequence number exceeding described threshold voltage, connects and save, with described battery, the side being connected
Way switch, makes part bypass charging current.
6. N+1 bypass resistance Rb (0) ... described in, Rb (N) resistance equal.
7. described in, N number of by-pass switch K (0) ..., K (N-1) are controlled integrated switch array.
The technique effect of the present invention:
What the present invention provided improves method and the circuit of bypass equilibrium effectiveness, has following technical effect that
1., when charging is close to when being full of, set n the voltage threshold being stepped up, relatively early control close to when being full of in charging
Start equilibrium, increase to over a threshold voltage with each voltage and take turns equilibrium for condition startup one, only at correspondence high threshold electricity
Charge closing passage of pressure, other time for balance keeps the method for charging, has taken into account the requirement of charging and balancing speed.
2. battery is divided in order odd even two groups, odd number or even number sequence number is saved the scheme of equilibrium with simplest every time
Logic control achieves the requirement simultaneously not equalized adjacent cell.
3. charging with small scale ON time after exceeding higher thresholds, all economize on electricity pressures exceed time threshold value of the highest economize on electricity pressure
Voltage judges that the method that battery is full of avoids and works in coordination with, with charge power supply, the way that observation charging current could judge to be full of.This side
Method relaxes the cooperation requirement to charge power supply, also improves the euqalizing current ratio relative to charging current simultaneously.
Therefore, compared to prior art, the solution of the present invention, 1. charging and equilibrium are faster.2. circuit realiration is simple, convenient
Integrated.3. pair charge power supply requires low.4. can accurately judge to be full of.
Accompanying drawing explanation
Fig. 1 is the bypass equalization scheme circuit diagram of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
A kind of method improving bypass equilibrium effectiveness, is carried out in the set of cells forming the cell joint being connected in series
During charging, when charging is close to when being full of, set m the voltage threshold being stepped up, certain in described m voltage threshold
Individual voltage threshold is designated as i-th voltage threshold, a highest voltage threshold correspondence joint maximum charging voltage；Save or some at certain
Batteries voltage reaches to be switched on bypass equilibrium during i-th voltage threshold, if i-th voltage threshold is not to save high charge electricity
Pressure, then keep charging while equilibrium, only when i-th voltage threshold reaches to save maximum charging voltage, closes when equilibrium
Charge tunnel.
Difference compared with the bypass equalization scheme of the bq77pl900 of TI company is, if i-th voltage threshold is not
It is the highest joint charging voltage, during equilibrium, does not stop charging.Comparing, this design relatively early starts bypass equilibrium, is reaching the highest
Charging is not stopped before node pressure, little on charging rate impact.
Said method comprising the steps of:
First described cell joint is divided into odd indexed group and even number sequence number group two groups by sequence sequence number；
1) measure the voltage of described cell joint, when measuring, update the parity of pendulous frequency counting every time；
2) battery joint and the sequence number of described battery joint of had more than i-th voltage threshold are recorded；
3) consistent with the odd even of measurement count, to the battery exceeding i-th voltage threshold to the odd even of battery joint sequence number
Joint connects bypass equalization discharge；If i-th voltage threshold is not joint maximum charging voltage, do not stop charging；If i-th is electric
Pressure threshold value is joint maximum charging voltage, stops charging；
4) repeat 1)～3) circulation, until all cell voltages exceed i-th voltage threshold；
5) if i-th voltage threshold is closest to save a lower threshold voltage of maximum charging voltage, report charging
When completing, stop equilibrium；If i-th voltage threshold is not closest to the threshold voltage of the highest joint charging voltage, then it is increased to
Next higher threshold voltage, continues repetition 1)～3) circulation.
Wherein, step 3) in, if i-th voltage threshold is not joint maximum charging voltage, but less than predetermined jth electricity
Pressure threshold value, does not stop charging, does not the most adjust the dutycycle of charge tunnel conducting；If i-th voltage threshold is not to save the highest filling
Piezoelectric voltage, but higher than predetermined jth voltage threshold, does not stop charging, but adjust the dutycycle of charge tunnel conducting to 1/8 or
Certain other small scale of person, i.e. only open the ON time of small scale in each front portion measuring circulation.
As it is shown in figure 1, be as a example by the set of cells of 15 string batteries, the circuit diagram of the bypass equalization scheme of the present invention is described.
A kind of circuit improving bypass equilibrium effectiveness, including the set of cells of the cell joint composition that 15 joints are connected in series, and 16
Individual bypass resistance Rb (0) ..., Rb (15) and 15 by-pass switch K (0) ..., K (15)；The first joint cell of set of cells
Negative pole by bypass resistance Rb (0) connect by-pass switch K (0) moved end, the positive pole of minor details cell passes through bypass resistance
Rb (15) connects the not moved end of by-pass switch K (15)；The negative pole of the n-th batteries and the positive pole of the (n-1)th batteries are by bypass electricity
Resistance Rb (n-1) connects moved end and the not moved end of K (n-1), the positive pole of the n-th batteries and (n+1)th batteries of by-pass switch K (n)
Negative pole by bypass resistance Rb (n) connect by-pass switch K (n) not moved end and the moved end of K (n+1)；When set of cells charging
Near when being full of, set m the voltage threshold being stepped up, and carry out measurement count, when measurement count odd even with exceed described
When the odd even of the battery joint sequence number of threshold voltage is consistent, connects and save, with described battery, the by-pass switch being connected, make part charged electrical
Stream bypass.Wherein, bypass resistance Rb (0) ..., Rb (N) resistance equal；By-pass switch K (0) ..., K (N-1) are controlled
Integrated switch array.
In Fig. 1, switch K (0)～K (15) in shadow region are used for connecting equilibrium bypass.When certain batteries electricity in charging
When pressure exceedes certain predetermined value, the switch connection corresponding with this joint makes part bypass charging current, thus reduces its charging current
Slow down charging rate accordingly, relatively early start bypass equilibrium, do not stop charging, to charging rate before high node pressure reaching
Affect little.The ratio that the charging rate difference caused accounts for charging current with by-pass current is relevant.The size of by-pass current is with other
The heating that resistance in path, road can bear is relevant, is generally not capable of the biggest；On the other hand, charging current or control can be reduced
The existence time of charging current equally improves by-pass current accounting.During to a batteries equilibrium, by-pass current is by cell voltage
Determine with path resistor.When bypassing two adjacent sections battery, by-pass current becomes the voltage by two batteries with same simultaneously
Path resistor determine, path heating improve 4 times.If the heat-sinking capability with single-unit Equalization Design, it is the most right to will be unable to bear
The heating of two joint bypasses.Need when Balance route to avoid the occurrence of and the situation of two adjacent sections equilibrium is occurred simultaneously.Work as set of cells
Charging, close to time full, sets m the voltage threshold being stepped up, such as, when charging is full of close to 90%, will remain about
The voltage of 10% is divided into some sections, such as 10 sections, sets 10 voltage thresholds being stepped up, and certain voltage threshold is designated as i-th
Individual voltage threshold, and start to record the battery joint of had more than i-th voltage threshold and the sequence number of described battery joint, enter simultaneously
Row measurement count, when measurement count odd even with exceed described threshold voltage battery joint sequence number odd even consistent time, connect with
The by-pass switch that described battery joint connects, makes part bypass charging current, it is to avoid occur simultaneously battery balanced to two adjacent sections
Situation occurs.If additionally i-th threshold voltage is not joint maximum charging voltage, do not stop charging, if but i-th voltage threshold
Value, less than predetermined jth voltage threshold (this voltage threshold is closest to save the threshold value of maximum charging voltage), does not stops filling
Electricity, does not the most adjust the dutycycle of charge tunnel conducting；If i-th voltage threshold is not joint maximum charging voltage, but higher than this
Individual predetermined jth voltage threshold, does not stop charging, but adjusts the dutycycle of charge tunnel conducting to 1/8 or certain other
Small scale, when i.e. battery is closely full of, only open the charging ON time of small scale, it is to avoid closely fills at battery
Work in coordination with charge power supply time full and observe the way that charging current could judge to be full of, relax the cooperation requirement to charge power supply,
Also improve the euqalizing current ratio relative to charging current simultaneously.
It is hereby stated that, described above contribute to skilled artisan understands that the invention, but and the unrestricted present invention
The protection domain created.Any equivalent described above, modification are improved without departing from the invention flesh and blood
And/or delete numerous conforming to the principle of simplicity and the enforcement that carries out, each fall within the protection domain of the invention.
Claims (7)
1. the method improving bypass equilibrium effectiveness, it is characterised in that to the cell joint composition being connected in series
During set of cells is charged, when charging is close to when being full of, set m the voltage threshold being stepped up, described m voltage
Certain voltage threshold in threshold value is designated as i-th voltage threshold, a highest voltage threshold correspondence joint maximum charging voltage；?
Certain joint or some batteries voltage reach to be switched on bypass equilibrium during i-th voltage threshold, if i-th voltage threshold is not joint
Maximum charging voltage, then keep charging while equilibrium, only when i-th voltage threshold reaches to save maximum charging voltage,
Charge closing passage during equilibrium.
The method improving bypass equilibrium effectiveness the most according to claim 1, it is characterised in that described method includes following
Step:
First described cell joint is divided into odd indexed group and even number sequence number group two groups by sequence sequence number；
1) measure the voltage of described cell joint, when measuring, update the parity of pendulous frequency counting every time；
2) battery joint and the sequence number of described battery joint of had more than i-th voltage threshold are recorded；
3) consistent with the odd even of measurement count to the odd even of battery joint sequence number, the battery exceeding i-th voltage threshold is saved and connects
Logical bypass equalization discharge；If i-th voltage threshold is not joint maximum charging voltage, do not stop charging；If i-th voltage threshold
Value is joint maximum charging voltage, stops charging；
4) repeat 1)～3) circulation, until all cell voltages exceed i-th voltage threshold；
5) if i-th voltage threshold is closest to save a lower threshold voltage of maximum charging voltage, charging complete is reported
Time, stop equilibrium；If i-th voltage threshold is not closest to the threshold voltage of the highest joint charging voltage, then it is increased to next
Individual higher threshold voltage, continue repetition 1)～3) circulation.
The method improving bypass equilibrium effectiveness the most according to claim 2, it is characterised in that described step 3) in, as
Really i-th voltage threshold is not joint maximum charging voltage, but less than predetermined jth voltage threshold, does not stop charging, the most uncomfortable
The dutycycle of whole charge tunnel conducting；If i-th voltage threshold is not joint maximum charging voltage, but higher than predetermined jth
Voltage threshold, does not stop charging, but the dutycycle of adjustment charge tunnel conducting is to 1/n or certain small percentage, i.e. in each survey
The ON time of small scale is only opened in the front portion of amount circulation.
The method improving bypass equilibrium effectiveness the most according to claim 3, it is characterised in that described step 3) in, adjust
The dutycycle of whole charge tunnel conducting is to 1/8.
5. one kind uses the circuit improving bypass equilibrium effectiveness as described in one of Claims 1-4, it is characterised in that include N
The set of cells of the cell joint composition that joint is connected in series, and N+1 bypass resistance Rb (0) ..., Rb (N) and N number of bypass
Switch K (0) ..., K (N-1)；The negative pole of the first joint cell of described set of cells connects bypass by bypass resistance Rb (0)
The moved end of switch K (0), the positive pole of minor details cell connects the not moved end of by-pass switch K (N) by bypass resistance Rb (N)；The
The negative pole of n batteries and the positive pole of the (n-1)th batteries connect moved end and the K of by-pass switch K (n) by bypass resistance Rb (n-1)
(n-1) not moved end, the positive pole of the n-th batteries and the negative pole of the (n+1)th batteries connect by-pass switch by bypass resistance Rb (n)
The not moved end of K (n) and the moved end of K (n+1)；When set of cells charging is close to when being full of, set m the voltage threshold being stepped up,
And carry out measurement count, when the odd even of measurement count is consistent with the odd even of the battery joint sequence number exceeding described threshold voltage, connect
The logical by-pass switch being connected with described battery joint, makes part bypass charging current.
The circuit improving bypass equilibrium effectiveness the most according to claim 4, it is characterised in that described N+1 bypass electricity
Resistance Rb (0) ..., the resistance of Rb (N) are equal.
The circuit improving bypass equilibrium effectiveness the most according to claim 4, it is characterised in that described N number of by-pass switch K
(0) ..., K (N-1) be controlled integrated switch array.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610594611.2A CN106160093B (en) | 2016-07-26 | 2016-07-26 | Improve the method and circuit of the balanced validity of bypass |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610594611.2A CN106160093B (en) | 2016-07-26 | 2016-07-26 | Improve the method and circuit of the balanced validity of bypass |
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| CN106160093B CN106160093B (en) | 2018-10-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110703048A (en) * | 2019-09-05 | 2020-01-17 | 安徽力高新能源技术有限公司 | Self-adaptive method for insulation monitoring time of electric automobile |
| CN114696429A (en) * | 2022-04-29 | 2022-07-01 | 点晶微(厦门)集成电路有限公司 | Circuit for realizing passive equalization control strategy of battery pack |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102237699A (en) * | 2010-04-26 | 2011-11-09 | 新普科技股份有限公司 | Charging device and charging method |
| US20130207610A1 (en) * | 2011-09-02 | 2013-08-15 | John Hull | Balancing cells in a battery pack |
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2016
- 2016-07-26 CN CN201610594611.2A patent/CN106160093B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102237699A (en) * | 2010-04-26 | 2011-11-09 | 新普科技股份有限公司 | Charging device and charging method |
| US20130207610A1 (en) * | 2011-09-02 | 2013-08-15 | John Hull | Balancing cells in a battery pack |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110703048A (en) * | 2019-09-05 | 2020-01-17 | 安徽力高新能源技术有限公司 | Self-adaptive method for insulation monitoring time of electric automobile |
| CN110703048B (en) * | 2019-09-05 | 2022-04-12 | 力高(山东)新能源技术有限公司 | Self-adaptive method for insulation monitoring time of electric automobile |
| CN114696429A (en) * | 2022-04-29 | 2022-07-01 | 点晶微(厦门)集成电路有限公司 | Circuit for realizing passive equalization control strategy of battery pack |
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| CN106160093B (en) | 2018-10-26 |
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