CN106970329A - The determination methods and battery-powered system of a kind of battery relative health - Google Patents
The determination methods and battery-powered system of a kind of battery relative health Download PDFInfo
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- CN106970329A CN106970329A CN201710147184.8A CN201710147184A CN106970329A CN 106970329 A CN106970329 A CN 106970329A CN 201710147184 A CN201710147184 A CN 201710147184A CN 106970329 A CN106970329 A CN 106970329A
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- 230000036541 health Effects 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 65
- 238000011156 evaluation Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims description 20
- 238000005303 weighing Methods 0.000 claims description 9
- 230000010349 pulsation Effects 0.000 claims description 5
- 238000007619 statistical method Methods 0.000 abstract description 2
- 230000003862 health status Effects 0.000 description 20
- 230000005611 electricity Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- 230000000739 chaotic effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The present invention relates to a kind of determination methods of battery relative health and battery-powered system.Including：The voltage per batteries in battery pack is gathered, is judged whether to need to carry out equilibrium according to the voltage consistency principle；If desired carry out balanced, balanced to needing balancing battery to carry out, record needs the battery of balancing battery to number, time for balance and balanced way；The difference evaluation for needing all average isostatic times for needing balancing battery in the time for balance and battery pack of balancing battery according to every section needs the relative health of balancing battery.Time for balance of the present invention by statistical analysis per batteries, the accurate relative health judged per batteries, selects the battery needed to be serviced, improves the overall performance of battery pack；Hardware cost need not be increased simultaneously, there is the application value that comparison is high.
Description
Technical field
The present invention relates to battery power field, more specifically to a kind of judgement side of battery relative health
Method and battery-powered system.
Background technology
The health status definition of battery：After battery uses a period of time, if capacity when battery is fully charged is less than battery
The 80% of rated capacity, battery should be replaced.For the health disparities of a Battery pack it is larger but all also not up to need
Battery is changed, but in use, electric discharge cut-off can be reached at first because the poor battery capacity of health status is low, during electric discharge
Voltage, other batteries are also not up to discharge cut-off voltage；The poor battery of health status can reach charge cutoff at first during charging
Voltage, other batteries are also not up to charge cutoff voltage；So as to cause battery pack to be not efficiently used.
Because the voltage of single battery is limited by electrode material, in charge and discharge process, cell voltage can be in certain limit
It is interior to change.When using battery, generally multiple batteries are used in series, supply voltage can be improved.But because battery is in system
During making, it is impossible to keep identical, can because the difference of the factor such as technique, material, cause battery voltage, internal resistance,
There is certain difference in the parameters such as the quantity of electric charge, these difference are the inconsistency of battery pack.Battery pack is in the process of recycling
In, again can be different due to factors such as battery electrolyte, self discharge, environment temperatures, the inconsistency of battery can following with battery
Ring is used and increased, and causes the health disparities of battery in a Battery pack larger, and the preferable battery of battery health can be after
It is continuous to use, and the poor internal resistance of cell of battery health is larger, capacity is low, is continuing with that the performance of whole group battery can be reduced.
For the relatively poor battery of battery health, capacity is relatively low when its battery is full of, and discharges under the same conditions
When, the cell voltage suppression ratio is very fast, discharges at first；When being charged under the same conditions, the cell voltage, which rises, also to be compared
It hurry up, be full of at first；All it is because caused by the poor battery of health status, it is therefore desirable to which the battery is carried out in the case of two kinds
It is corresponding to safeguard.And battery long-term work non-full full of putting under state, therefore using it is full be full of put judge health status compared with
The battery of difference does not meet actual conditions.
The content of the invention
The technical problem to be solved in the present invention is that above-mentioned for prior art judges that battery is good for using expiring full of putting
There is provided a kind of determination methods of battery relative health and battery-powered system for the irrational defect of health situation.
The technical solution adopted for the present invention to solve the technical problems is：Construct a kind of judgement of battery relative health
Method, including：
S1：The voltage per batteries in battery pack is gathered, is judged whether to need to carry out equilibrium according to the voltage consistency principle；
S2：If so, balanced to needing balancing battery to carry out, record it is described need the battery of balancing battery to number, time for balance, with
And balanced way；
S3：According to every section time for balance for needing balancing battery and all balancing batteries that need in the battery pack
The difference evaluation of average isostatic time is described to need the relative health of balancing battery.
Further, the determination methods of battery relative health of the present invention, repeat the step S1- steps
S2；
The step S3 includes：The average isostatic time of balancing battery is needed with owning in the battery pack according to every section is described
The difference of the average isostatic time for needing balancing battery, which is evaluated, described needs the relative health of balancing battery.
Preferably, the determination methods of battery relative health of the present invention, the balanced way is charge balancing,
The step S3 includes：
Calculate and often save the average isostatic time for needing balancing battery charging process and all need in the battery pack
The first difference of the average isostatic time of balancing battery charging process；
Often save the relative health and first difference for needing balancing battery inversely.
Further, the determination methods of battery relative health of the present invention, in addition to：
Being more than the described of the first preset value to first difference needs balancing battery to safeguard, the first preset value root
Set according to the relative health of the battery pack.
Preferably, the determination methods of battery relative health of the present invention, the balanced way is equalization discharge,
The step S3 includes：
Calculate and often save the average isostatic time for needing balancing battery discharge process and all need in the battery pack
The second difference of the average isostatic time of balancing battery discharge process；
It is described that often to save the relative health and second difference for needing balancing battery proportional.
Further, the determination methods of battery relative health of the present invention, in addition to：
Being more than the described of the second preset value to second difference needs balancing battery to safeguard, the second preset value root
Set according to the relative health of the battery pack.
Preferably, the determination methods of battery relative health of the present invention, the step S1 includes：
Voltage acquisition module gathers the voltage per batteries in the battery pack, and controller is sentenced according to the voltage consistency principle
It is disconnected whether to need to carry out equilibrium.
Further, the determination methods of battery relative health of the present invention, it is described according to the voltage consistency principle
Judge whether to need to carry out equilibrium, including：
According to the voltage pulsation of battery in the battery pack whether within a preset range, judge whether to need to carry out equilibrium.
Further, the determination methods of battery relative health of the present invention, the step S2 also includes：Record institute
Stating needs the balance frequency of balancing battery；
The step S3 includes：Often saving described needs the relative health of balancing battery and the balance frequency to be inversely proportional pass
System.
In addition, the present invention also constructs a kind of battery-powered system, the system uses above-mentioned battery relative health
Determination methods.
Implement the determination methods and battery-powered system of a kind of battery relative health of the present invention.Have with following
Beneficial effect：This method includes：Gather the voltage per batteries in battery pack, according to the voltage consistency principle judge whether to need into
Row is balanced；If desired carry out it is balanced, it is balanced to needing balancing battery to carry out, record needs the battery of balancing battery to number, time for balance,
And balanced way；According to it is every section need in the time for balance and battery pack of balancing battery it is all need the average isostatic of balancing battery when
Between difference evaluation need the relative health of balancing battery.Time for balance of the present invention by statistical analysis per batteries, it is accurate
Really judge the relative health per batteries, select the battery needed to be serviced, improve the overall performance of battery pack；Together
Shi Wuxu increases hardware cost, there is the application value that comparison is high.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is a kind of schematic flow sheet of the determination methods first embodiment of battery relative health of the invention；
Fig. 2 is a kind of schematic flow sheet of the determination methods second embodiment of battery relative health of the invention；
Fig. 3 is the battery balanced tendency chart of battery pack charging process.
Embodiment
In order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, now compare accompanying drawing and describe in detail
The embodiment of the present invention.
Fig. 1 is a kind of schematic flow sheet of the determination methods first embodiment of battery relative health of the invention.
The present embodiment provides a kind of determination methods of battery relative health, just can quickly judge by one-shot measurement
Health status in battery pack per batteries.Specifically, this method includes：
S1：The voltage per batteries in battery pack is gathered, is judged whether to need to carry out equilibrium according to the voltage consistency principle.
Specifically, the voltage acquisition module in battery management system gathers the voltage in battery pack per batteries, controller
Judged whether to need to carry out equilibrium according to the voltage consistency principle.
Within a preset range whether battery consistency principle, judge whether to need i.e. according to the voltage pulsation of battery in battery pack
Equilibrium is carried out, if voltage pulsation is within a preset range, equilibrium need not be carried out；If beyond the scope, needed to phase
The battery answered carries out balanced.To needing progress battery balanced to battery average voltage in a balanced way, prevent from causing Balance route chaotic.
It has been generally acknowledged that the scope range of the fluctuation of voltage of battery pack is in the range of 20mV, indicate that the consistency of battery pack is preferable；Preset range can
It is configured according to management battery pack demand.
S2：If desired progress is balanced, balanced to needing balancing battery to carry out, and record needs the battery of balancing battery to number, equilibrium
Time and balanced way, wherein, balanced way includes charge balancing and equalization discharge.It is appreciated that need not be in a balanced way
The time for balance of battery is designated as zero.
S3：Need all in the time for balance and battery pack of balancing battery to need the average isostatic time of balancing battery according to every section
Difference evaluation need the relative health of balancing battery.
Specifically, according to step S2 record need the battery of balancing battery to number, time for balance and balanced way, obtain
Need the balancing procedure parameter of balancing battery to often section, count under identical balanced way all time for balance for needing balancing battery it
With it is all to need the time for balance sum of balancing battery divided by need the quantity of balancing battery to obtain all needing the average equal of balancing battery
The weighing apparatus time.And then calculate often section and need all in the time for balance and battery pack of balancing battery to need the average isostatic time of balancing battery
Difference.
The balanced way of battery pack includes charge balancing and equalization discharge, and for charge balancing, difference is bigger, and correspondence needs equal
The health status of weighing apparatus battery is poorer；For equalization discharge, difference is bigger, and correspondence needs the health status of balancing battery better.
Further, be provided for weighing the preset value of the health standards of battery, more often section need the difference of balancing battery with
The size of preset value, and then judge whether batteries need maintenance.Preset value is preset including being used to weigh the first of charging process
Value and the second preset value for weighing discharge process.For charging process：When difference is more than the first preset value, illustrate pair
Answer the relative health of battery poor, it is necessary to be safeguarded.For discharge process：When difference is more than the second preset value, explanation
The relative health of correspondence battery is preferable, but battery consistency can be poor, needs also exist for being safeguarded.
The above method is illustrated with reference to Fig. 3, Fig. 3 is the battery balanced tendency chart of battery pack charging process.
In figure 3, battery pack includes battery：CELL1, CELL2, CELL3, CELL4, CELL5, fill to battery pack
Electricity, balancing procedure of the record per batteries.In charging process, judged by the voltage consistency principle, CELL1, CELL2,
CELL3, CELL4, CELL5 are required for equilibrium.After charging terminates, CELL1, CELL2, CELL3, CELL4, CELL5 charging are equal
Weighing apparatus is followed successively by T1, T2, T3, T4, T5 total time, then all to need the average isostatic time of balancing battery：
T=(T1+T2+T3+T4+T5)/5
T1-T, T2-T, T3-T, T4-T, T5-T are calculated respectively, and difference is compared with preset value X.Battery operation one
After the section time, if T1-T>X, then can be determined that battery CELL1 relative health is poor, it is necessary to be safeguarded.
Fig. 2 is a kind of schematic flow sheet of the determination methods second embodiment of battery relative health of the invention.
The present embodiment provides a kind of determination methods of battery relative health, first embodiment be by one-time detection come
Judge the health status of battery, can quickly obtain the substantially health status of battery.But because there is accidentalia, to make judged result
More accurate, the algorithm that the present embodiment is averaged using repeatedly measuring is judged in battery pack per batteries by repeatedly measurement
Health status.Specifically, this method includes：
S1：The voltage per batteries in battery pack is gathered, is judged whether to need to carry out equilibrium according to the voltage consistency principle.
Specifically, the voltage acquisition module in battery management system gathers the voltage in battery pack per batteries, controller
Judged whether to need to carry out equilibrium according to the voltage consistency principle.
Within a preset range whether battery consistency principle, judge whether to need i.e. according to the voltage pulsation of battery in battery pack
Carry out equilibrium.It has been generally acknowledged that the scope range of the fluctuation of voltage of battery pack is in the range of 20mV, indicate that the consistency of battery pack is preferable；
If beyond the scope, needing to carry out equilibrium to corresponding battery.It is battery balanced average to battery in a balanced way to needing to carry out
Voltage, prevents from causing Balance route chaotic.
S2：If so, balanced to needing balancing battery to carry out, record needs the battery of balancing battery to number, time for balance, Yi Jijun
Weighing apparatus mode, wherein, balanced way includes charge balancing and equalization discharge.
Preferably, step S1- steps S2 is repeated.The present embodiment is not limited number of repetition, people in the art
Member can be adjusted according to measurement accuracy demand.
Repeat after step S1- steps S2, obtain multigroup measured value of battery pack.Calculating often section needs the flat of balancing battery
Equal time for balance, and calculate and all need the average isostatic time that balancing battery is repeatedly measured.Afterwards, balanced electricity is needed according to every section
The difference evaluation of average isostatic time in pond and all average isostatic times for needing balancing battery in battery pack need balancing battery
Relative health.
Specifically, the balanced way of battery pack is divided into charge balancing and equalization discharge, illustrate individually below.
A, for charge balancing：
Calculating often section needs the average isostatic time of balancing battery charging process to need balancing battery to charge with all in battery pack
The first difference of the average isostatic time of process；
Often section needs the relative health and the first difference of balancing battery inversely, i.e., the first difference is bigger, the electricity
The relative health in pond is poorer.
Further, the determination methods of the battery relative health of the present embodiment set the first preset value, the first preset value
Set according to the relative health of battery pack, the health standards for weighing battery.First difference is entered with the first preset value
Row compares, and the first preset value is more than to the first difference needs balancing battery to safeguard.
B, for equalization discharge：
Calculating often section needs the average isostatic time of balancing battery discharge process to need balancing battery to discharge with all in battery pack
The second difference of the average isostatic time of process；
Often section needs that the relative health and the second difference of balancing battery are proportional, i.e., the second difference is bigger, battery
Relative health it is better.
Further, the determination methods of the battery relative health of the present embodiment set the second preset value, to the second difference
Balancing battery is needed to be safeguarded more than the second preset value, the second preset value is set according to the relative health of battery pack.
In addition, in balancing procedure, balanced number of times can also be used for weighing the relative health of battery.Therefore, step S2
Also record needs the balance frequency of balancing battery；Often section need the relative health of balancing battery with balance frequency inversely,
That is the charge balancing number of times of battery is more, shows that the health status of the battery is poorer；The equalization discharge number of times of battery is more, shows
The relative health of the battery is better；When battery charge balancing and all less equalization discharge number of times, then the battery is consistent
Property preferably, when all battery with two side terminals are all preferable in battery pack, the battery performance can be only achieved most preferably.
For example in figure 3, for charge balancing, CELL1 balance frequency highest, so CELL1 health status is worst,
Need to be serviced.
Preferably for other embodiment, two indexs of the time for balance of battery and balance frequency can be combined
To weigh the health status of battery.For charge balancing, time for balance is longer, and the higher battery of balance frequency, health status
It is poorer, it is necessary to be safeguarded；Or, in the case where time for balance is equal, the higher battery of balance frequency, health status is poorer,
Need to be serviced.For equalization discharge, time for balance is longer, and the higher battery of balance frequency, and health status is better, but electricity
Pond group uniformity is poor；Or, in the case where time for balance is equal, the higher battery of balance frequency, health status is better, but electricity
Pond group uniformity is poor.
Further, the time for balance of battery and the weighted value of balance frequency are set respectively, weighed according to weighted value result of calculation
Measure the health status of battery.
In addition, the present invention also constructs a kind of battery-powered system, the system uses above-mentioned battery relative health
Determination methods judge the relative health of battery in battery pack, and the battery for needing to safeguard is safeguarded, improve battery pack
Overall performance.
The application proposes a kind of simple relative health determination methods for the health status of battery pack, passes through statistics
Time for balance of the analysis per batteries, the accurate relative health judged per batteries, and then select and need to be serviced
Battery, improve battery pack overall performance.In addition, the application need not increase hardware cost, there is the use value that comparison is high.
Above example only technical concepts and features to illustrate the invention, its object is to allow person skilled in the art
Scholar can understand present disclosure and implement accordingly, can not limit the scope of the invention.It is all to be wanted with right of the present invention
The equivalent changes and modifications that scope is done are sought, the covering scope of the claims in the present invention all should be belonged to.
Claims (10)
1. a kind of determination methods of battery relative health, it is characterised in that including：
S1：The voltage per batteries in battery pack is gathered, is judged whether to need to carry out equilibrium according to the voltage consistency principle；
S2：If so, balanced to needing balancing battery to carry out, record it is described need the battery of balancing battery to number, time for balance, Yi Jijun
Weighing apparatus mode；
S3：The time for balance of balancing battery is needed described to need being averaged for balancing battery with all in the battery pack according to every section is described
The difference evaluation of time for balance is described to need the relative health of balancing battery.
2. the determination methods of battery relative health according to claim 1, it is characterised in that
Repeat the step S1- steps S2；
The step S3 includes：According to all in every section average isostatic time for needing balancing battery and the battery pack
Need the difference evaluation of the average isostatic time of balancing battery is described to need the relative health of balancing battery.
3. the determination methods of battery relative health according to claim 2, it is characterised in that the balanced way is
Charge balancing, the step S3 includes：
Calculating often save it is described need the average isostatic time of balancing battery charging process with the battery pack it is all it is described need it is balanced
The first difference of the average isostatic time of battery charging process；
Often save the relative health and first difference for needing balancing battery inversely.
4. the determination methods of battery relative health according to claim 3, it is characterised in that also include：
Being more than the described of the first preset value to first difference needs balancing battery to safeguard, first preset value is according to institute
State the relative health setting of battery pack.
5. the determination methods of battery relative health according to claim 2, it is characterised in that the balanced way is
Equalization discharge, the step S3 includes：
Calculating often save it is described need the average isostatic time of balancing battery discharge process with the battery pack it is all it is described need it is balanced
The second difference of the average isostatic time of battery discharge procedure；
It is described that often to save the relative health and second difference for needing balancing battery proportional.
6. the determination methods of battery relative health according to claim 5, it is characterised in that also include：
Being more than the described of the second preset value to second difference needs balancing battery to safeguard, second preset value is according to institute
State the relative health setting of battery pack.
7. the determination methods of battery relative health according to claim 1, it is characterised in that the step S1 bags
Include：
Voltage acquisition module gathers the voltage per batteries in the battery pack, and controller is according to the judgement of the voltage consistency principle
It is no to need to carry out equilibrium.
8. the determination methods of battery relative health according to claim 1, it is characterised in that described according to voltage one
Cause property principle judges whether to need to carry out equilibrium, including：
According to the voltage pulsation of battery in the battery pack whether within a preset range, judge whether to need to carry out equilibrium.
9. the determination methods of battery relative health according to claim 1, it is characterised in that the step S2 is also wrapped
Include：Recording described needs the balance frequency of balancing battery；
The step S3 includes：Often save the relative health and the balance frequency for needing balancing battery inversely.
10. a kind of battery-powered system, it is characterised in that the system usage right requires the battery described in any one of 1-9
The determination methods of relative health.
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| CN201710147184.8A CN106970329B (en) | 2017-03-13 | 2017-03-13 | method for judging relative health condition of batteries and battery pack power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109428130A (en) * | 2017-08-31 | 2019-03-05 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN109428130B (en) * | 2017-08-31 | 2020-09-15 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic device |
| CN113625167A (en) * | 2020-05-08 | 2021-11-09 | 郑州宇通集团有限公司 | Method for evaluating equalization effect of battery management system |
| CN113625167B (en) * | 2020-05-08 | 2024-04-12 | 郑州宇通集团有限公司 | Evaluation method for equalization effect of battery management system |
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