CN106655408A - Balancing control method and control device of battery pack - Google Patents
Balancing control method and control device of battery pack Download PDFInfo
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- CN106655408A CN106655408A CN201710067083.XA CN201710067083A CN106655408A CN 106655408 A CN106655408 A CN 106655408A CN 201710067083 A CN201710067083 A CN 201710067083A CN 106655408 A CN106655408 A CN 106655408A
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- battery module
- battery
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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
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- 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
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- 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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- Engineering & Computer Science (AREA)
- Power Engineering (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 invention relates to a balancing control method and control device of a battery pack. The control method comprises the steps of firstly obtaining a firstly charged battery module in the charging process and a firstly discharged battery module in the discharging process when balancing control is carried out; and judging whether the two battery modules are the same battery module or not, if not, transferring energy in the firstly charged battery module into the firstly discharged battery module. The energy of the two battery modules can be balanced through the mode; the available capacity of the battery pack is improved; balancing of the battery pack is achieved; and furthermore, according to the balancing control method, for a key point of affecting the available capacity of the battery pack, a balancing control strategy is implemented by employing the key point as a balancing condition, so that the reliability is high and balancing of the battery pack can be effectively ensured.
Description
Technical field
The present invention relates to battery pack balancing control method and control device.
Background technology
Power lithium-ion battery is originated or during energy-storage system energy storage carrier as the energy of electric automobile, it usually needs
By connection in series-parallel in groups meeting system voltage, power and energy requirement.Generally, battery pack includes several strings simultaneously
The battery module that connection is arranged, each battery module includes a cell or at least two cells.And battery in groups after
Due to the problem of inconsistency between battery so that whole group performance is worse than the summation of cell performance in group.Problem of inconsistency
Producing reason can be largely classified into two big class：(1) inconsistency of initial performance, due to technique and material in cell production process
The difference of matter so that battery has differences in performances such as initial capacity, DC internal resistance, self-discharge rate and efficiency for charge-discharges；(2) into
Group and the inconsistency using process, be on the one hand the otherness of battery initial performance being built up using process and amplified,
On the other hand it is that battery use environment (temperature and ventilation condition etc.) has differences, causes each battery with different rates decline.With
The passage of time, battery pack problem of inconsistency will persistently aggravate, so as to having a strong impact on the actual active volume of battery pack, using
Life and reliability.Battery pack balancing technology in groups should as the Main Means for solving battery pack problem of inconsistency to battery
With having great significance.
The core for realizing this defencive function is the Balance route of battery pack.At present balancing control circuit is generally divided into master
Balanced and passive equilibrium is moved, in essence balancing control circuit generally affects equalization efficiency and cost of hardware design, and balanced
Control strategy is only the balanced whether effective core content of decision.At present the country is still no can accurately estimate SOC, SOH and electricity
The BMS of pond internal resistance, its Balance route strategy is still based on Pressure and Control, but the otherness of lithium battery terminal voltage is tended not to enough
Internal inconsistency between accurate description lithium battery, the i.e. equilibrium based on terminal voltage can not really improve between lithium battery group
Uniformity, this is also the major technology bottleneck for causing portfolio effect not good.
Application publication number turns to disclose a kind of battery balanced energy in the Chinese patent application file of CN101872877A
The method of shifting, first determines whether whether cell ceiling voltage reaches the voltage difference of setting with minimum voltage in battery pack, if reaching
To the voltage difference of setting, then start battery balanced energy transfer.Although the method can to a certain extent realize the equal of battery pack
Weighing apparatus, but, in a balanced way Rule of judgment is the difference of ceiling voltage and minimum voltage, and reliability is relatively low.
The content of the invention
It is an object of the invention to provide a kind of battery pack balancing control method, to solve traditional battery pack equilibrium method
The relatively low problem of reliability.Present invention simultaneously provides a kind of cell balance control unit.
For achieving the above object, the solution of the present invention includes a kind of battery pack balancing control method, including Balance route
The step of step, Balance route, includes：
(1) battery module that charging is initially completed in charging process is obtained, the first battery module is designated as, and in electric discharge
During be initially completed the battery module of electric discharge, be designated as the second battery module；
(2) judge whether the first battery module and the second battery module are same battery modules；
(3) if not same battery module, then by the energy transfer in the first battery module to the second battery module；
Wherein, it is described to be initially completed charging and refer to：There is charge protection at first or in charging complete previous moment voltage
Highest；It is described to be initially completed electric discharge and refer to：There is discharge prevention at first or to complete previous moment voltage in electric discharge minimum.
The number of the cell in the battery module is one.
Before the step of the Balance route, the battery pack balancing control method also includes the judgement of capacity and voltage
The step of, include the step of the judgement of the capacity and voltage：
1) the actual active volume and the error amount of the capacity threshold of setting of battery pack are calculated, volume error value is designated as；
2) when first threshold value of the volume error value more than or equal to setting, any two battery module is calculated
The voltage error value of synchronization in charging process or in discharge process；
3) when having at least one voltage error value in the voltage error value of any two battery module more than or equal to setting
During fixed second threshold value, the step of implement the Balance route.
The synchronization is that charging complete previous moment or electric discharge complete previous moment.
If the first battery module and the second battery module are same battery modules, Balance route terminates, and judges the electricity
Pond module is fail battery module.
A kind of cell balance control unit, including equalization control module, the equalization control module is included with lower unit：
Acquiring unit, for obtaining the battery module that charging is initially completed in charging process, is designated as the first battery module,
And the battery module of electric discharge is initially completed in discharge process, it is designated as the second battery module；
Judging unit, for judging whether the first battery module and the second battery module are same battery modules；
Balanced unit, for if not same battery module, then by the energy transfer in the first battery module to second
In battery module；
Wherein, it is described to be initially completed charging and refer to：There is charge protection at first or in charging complete previous moment voltage
Highest；It is described to be initially completed electric discharge and refer to：There is discharge prevention at first or to complete previous moment voltage in electric discharge minimum.
The number of the cell in the battery module is one.
The control device also includes capacity and voltage judge module, and the capacity and voltage judge module include placing an order
Unit：
First processing units, for calculating the actual active volume of battery pack and the error amount of the capacity threshold of setting, note
For volume error value；
Second processing unit, for when the volume error value is more than or equal to the first threshold value for setting, calculating
The voltage error value of any two battery module synchronization in charging process or in discharge process；
3rd processing unit, for having at least one voltage error value in the voltage error value for working as any two battery module
During more than or equal to the second threshold value for setting, implement Balance route.
The synchronization is that charging complete previous moment or electric discharge complete previous moment.
If the first battery module and the second battery module are same battery modules, Balance route terminates, and judges the electricity
Pond module is fail battery module.
In the battery pack balancing control method that the present invention is provided, obtain first and charge protection occurs at first in charging process
Or in charging complete previous moment voltage highest battery module, it is designated as the first battery module, and in discharge process most
First there is discharge prevention or complete the minimum battery module of previous moment voltage in electric discharge, be designated as the second battery module.Because
The two battery modules are exactly the key point for determining battery pack active volume, and using the two battery modules as Balance route
Foundation；Then, judge whether the two battery modules are same battery modules, if not same module, then the battery
Group just has the space of improvement, and that be initially completed energy transfer in the battery module of charging to the just by the first battery module
Two battery modules, that is, be initially completed the battery module of electric discharge, so balances the energy of the two battery modules, improves battery
The active volume of group, realizes the equilibrium of battery pack, so, this balance control method is for affecting battery pack active volume
Key point, using the key point as condition in a balanced way Balance route strategy is implemented, and its is highly reliable, can effectively ensure that electricity
The equilibrium of pond group.
In addition, if the first module and the second module are same modules, that just illustrates that the reality of the battery module is available and holds
Amount very little, be constitute battery pack active volume short slab be located, that it is determined that the battery module be malfunctioning module, so,
The balance control method may recognize that the fail battery module in battery pack, the positioning function with fail battery module,
The uniformity and active volume of battery pack can be effectively improved, the safety and reliability that battery pack is used further is lifted.
Description of the drawings
Fig. 1 is battery pack balancing control principle schematic block diagram；
Fig. 2 is battery pack balancing control flow chart；
Fig. 3-a are the graphs of a relation of battery pack active volume and each cell；
Fig. 3-b are energy transfer schematic diagrames；
Fig. 4 is balanced end flow chart.
Specific embodiment
Control method embodiment
As shown in figure 1, it is battery pack balancing control principle block diagram of the present invention, the figure is intended merely to general description battery pack
The principle of Balance route, specific control process sees below described.The base unit of Balance route is battery module, in this enforcement
In example, the number of the cell in battery module is one, that is to say, that battery module is exactly cell.
The voltage of battery pack and the information data of capacity are obtained first, wherein, voltage data is battery pack in discharge and recharge
The voltage of each cell in journey, capacity data can use charge/discharge capacity for the reality of battery pack.The acquisition of voltage data can
Detected by voltage sensor；And capacity data be electric current and voltage are carried out it is calculated, so, in addition it is also necessary in electricity
Chi Zuzhong arranges current sensor to detect the correlated current information of battery pack.Because voltage sensor and current sensor belong to
Routine techniques, and, the calculating of capacity falls within routine techniques, just no longer illustrates here.
The error amount of the actual active volume of battery pack and the capacity threshold of setting is calculated, is made with the condition that the error amount meets
For balanced decision condition 1, wherein, the capacity threshold of setting is generally the rated capacity that battery pack is dispatched from the factory, also referred to as marked capacity,
But, after used a period of time its rated capacity will decay battery pack, now, it is necessary to carry out school to rated capacity
It is accurate, then, the capacity threshold of setting is just the capacity after calibration.In addition, the computing formula of the error amount of capacity can be：
The capacity threshold of volume error value percentage=(capacity threshold of setting-actual active volume)/setting
Balanced decision condition 1 is the size for judging to compare volume error value and the capacity threshold of setting, then, capacity is missed
Difference represents balanced decision condition 1 and sets up more than or equal to the capacity threshold of setting.
The voltage error value between each cell in battery pack is calculated, that is, calculates any two cell in battery pack
Voltage error value, the condition met using the voltage error value is used as balanced decision condition 2.Wherein, voltage error value can be
Difference, or ratio between two magnitudes of voltage.And, in order to ensure the accuracy of follow-up judgement, above-mentioned each monomer electricity
The magnitude of voltage in pond is the magnitude of voltage of synchronization, also, further, synchronization is before discharge and recharge latter stage, i.e. charging complete
One moment or electric discharge complete previous moment.
Balanced decision condition 2 is the size for judging comparison voltage error amount and the voltage threshold of setting, then, any two
There is at least one error amount to represent more than or equal to the voltage threshold of setting in the voltage error value of individual cell
Weighing apparatus decision condition 2 is set up.
Also, precedence relationship is there is between balanced decision condition 1 and balanced decision condition 2, as shown in Fig. 2 entering first
The acquisition of row associated voltage information and capacity information, then carries out the judgement of balanced decision condition 1, only in balanced decision condition
After 1 sets up, the judgement of balanced decision condition 2 is just carried out.And after balanced decision condition 2 is set up, carry out following strategies：
In charging process, the cell that charging is initially completed in each cell is found, wherein, it is initially completed charging
Refer to：The highest voltage in charging process terminates the voltage of each cell of previous moment, or, if battery pack has charging
Protection, then, being initially completed charging can also refer to that reaching triggering charge protection at first (triggers at first charger in charging process
Shield threshold value).In the present embodiment, it is initially completed charging to refer in the voltage that charging process terminates each cell of previous moment
Highest voltage, then, find in each cell and terminate previous moment voltage highest cell in charging process, below
Provide a kind of specific means：Detect that each cell terminates the voltage of previous moment in charging process, by each magnitude of voltage according to electricity
Pressure order from high to low is ranked up, it is considered to multiple cell voltages are there may be in real process and is closer to, therefore can be with reference to real
Border efficient balance way, setting voltage valid interval (such as 50mV) to be improving equalization efficiency, then, according to voltage from high to low
The voltage of each cell after order sequence is respectively：UH1、UH2、UH3…UHN, then UH1For magnitude of voltage highest voltage, the electricity
Corresponding cell is pressed to be defined as the first cell.
In discharge process, the cell that electric discharge is initially completed in each cell is found, wherein, it is initially completed electric discharge
Refer to：The minimum voltage in discharge process terminates the voltage of each cell of previous moment, or, if battery pack has electric discharge
Protection, then, being initially completed electric discharge can also refer to that reaching triggering discharge prevention at first (triggers at first electric discharge to protect i.e. in discharge process
Shield threshold value).In the present embodiment, it is initially completed electric discharge to refer in the voltage that discharge process terminates each cell of previous moment
Minimum voltage, then, find in each cell and terminate the minimum cell of previous moment voltage in discharge process, below
Provide a kind of specific means：Detect that each cell terminates the voltage of previous moment in discharge process, by each magnitude of voltage according to electricity
Pressure order from low to high is ranked up, it is considered to multiple cell voltages are there may be in real process and is closer to, therefore can be with reference to real
Border efficient balance way, setting voltage valid interval (such as 50mV) to be improving equalization efficiency, then, according to voltage from low to high
The voltage of each cell after order sequence is respectively：UL1、UL2、UL3…ULN, then UL1For the voltage that magnitude of voltage is minimum, the electricity
Corresponding cell is pressed to be defined as second comonomer battery.
The acquisition process of above-mentioned first cell and second comonomer battery does not have strict sequencing, can be according to
Actual conditions arrange sequencing, it is also possible to while carrying out.
For obtaining UH1And UL1Battery pack, it is clear that the actual active volume of battery pack depend on UH1And UN1This two
Feature battery, as shown in Fig. 3-a in cell A and C.
If the first cell and second comonomer battery are not identical cells, then, by the first cell
In energy transfer into second comonomer battery, so as to improve the active volume of whole battery pack, realize the balanced control of battery pack
System, as shown in Fig. 3-b.Wherein, energy transfer implements means and realizes that circuit belongs to prior art, such as：The back of the body
The certain explanation of application documents disclosed in scape technology, or it is entitled《Battery pack balancing module based on energy transfer
Research》Paper in also have related description, so, just no longer illustrate here.
Therefore, balanced unlocking condition judges by capacity difference, voltage difference and voltage ranking results, when it is determined that needing in a balanced way
After battery, with reference to shown in Fig. 1, equalization instruction is exported by balanced identifying unit, then Balance route is carried out by balanced executing agency.
As shown in figure 4, whether Balance route closedown condition is that same battery comes by high power capacity and low capacity feature battery
Judge, i.e., for above-mentioned UH1、UH2、UH3…UHNAnd UL1、UL2、UL3…ULNSequence, when the first cell of judgement and second comonomer
When battery is same battery, it is believed that this time Balance route terminates.Because the battery charging and discharging is completed earliest, that is just said
The actual active volume very little of the bright cell, is that the short slab for constituting battery pack active volume is located, and that was it is determined that should
Monomer is short slab fail battery, and controller sends warning, and staff can also be processed and be changed to the cell.Institute
With, the balance control method may recognize that the fail battery in battery pack, can effectively improve battery pack uniformity and
Active volume.
In addition, in principle, Balance route, other batteries are carried out according to the cell for being initially completed charging and discharging
It is not the factor of control, does not affect the carrying out for controlling, so, if the voltage correspondence of other correspondence positions in two sequences
Battery be same battery if, such as：Work as UH3And UL3When corresponding cell is same battery, due to the battery
It is not the factor of the most critical for affecting battery pack active volume, then, battery capacity still has the space of improvement, the condition
Balanced termination condition is cannot function as, then rejects the battery, being not for the battery carries out equilibrium, then according to above-mentioned equilibrium side
Method carries out equilibrium.
The balance control method can simultaneously be applied to the passive balanced and active equalization of current main flow, if passive balanced,
U then only need to be opened in charging processH1、UH2、UH3…UHNThe passive equalizing circuit of battery pack, according to active equalization, by
Do not have energy loss, euqalizing current larger in it, therefore whole in charge and discharge process can open equalizing circuit, more efficient completes
It is balanced.
Above-mentioned Balance route strategy is loaded in the controller in the way of software program, and the controller can be special setting
Control chip, can also be battery pack BMS.
In above-described embodiment, the detailed process of Balance route is given, the judgement of capacity is carried out first, then carry out voltage
Judgement, then carry out Balance route according to two feature batteries, certainly, sentencing for capacity and voltage was carried out before Balance route
It is disconnected, Balance route is just carried out when capacity and voltage have certain difference, certainly, inventive point of the invention is follow-up equal
Weighing apparatus control, for the judgement for carrying out capacity and voltage before the equalization is more optimal embodiment, as general reality
Mode is applied, such as：The difference of capacity and voltage is not required, or has been carried out the judgement of capacity and voltage in advance, this
The balance control method of bright offer can directly carry out Balance route.
In above-described embodiment, the number of the cell in battery module is 1, as other embodiments, when battery mould
When block includes at least two cells, Balance route is carried out as a most basic unit using battery module, the enforcement
Under mode, the process of Balance route is identical with the process of above-mentioned embodiment, just no longer illustrates here.
Control device embodiment
The present embodiment provides a kind of cell balance control unit, including equalization control module, and equalization control module includes
With lower unit：
Acquiring unit, for obtaining the battery module that charging is initially completed in charging process, is designated as the first battery module,
And the battery module of electric discharge is initially completed in discharge process, it is designated as the second battery module；
Judging unit, for judging whether the first battery module and the second battery module are same battery modules；
Balanced unit, for if not same battery module, then by the energy transfer in the first battery module to second
In battery module；
Wherein, it is initially completed charging to refer to：There is charge protection at first or in charging complete previous moment voltage highest；
It is initially completed electric discharge to refer to：There is discharge prevention at first or to complete previous moment voltage in electric discharge minimum.
So, each unit in the control device is the software unit with corresponding implementation steps, by each software unit
Load in the controller to realize corresponding function, therefore, the control device is still substantially control method, due to the controlling party
Method, as describing in detail, is just no longer illustrated here in above-mentioned control method embodiment.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in teaching of the invention
The model of shape, formula, parameter simultaneously need not spend creative work.It is right without departing from the principles and spirit of the present invention
Change, modification, replacement and the modification that embodiment is carried out is still fallen within protection scope of the present invention.
Claims (10)
1. the step of a kind of battery pack balancing control method, it is characterised in that the step of including Balance route, Balance route
Including：
(1) battery module that charging is initially completed in charging process is obtained, the first battery module is designated as, and in discharge process
In be initially completed the battery module of electric discharge, be designated as the second battery module；
(2) judge whether the first battery module and the second battery module are same battery modules；
(3) if not same battery module, then by the energy transfer in the first battery module to the second battery module；
Wherein, it is described to be initially completed charging and refer to：There is charge protection at first or in charging complete previous moment voltage highest；
It is described to be initially completed electric discharge and refer to：There is discharge prevention at first or to complete previous moment voltage in electric discharge minimum.
2. battery pack balancing control method according to claim 1, it is characterised in that the monomer electricity in the battery module
The number in pond is one.
3. battery pack balancing control method according to claim 1 and 2, it is characterised in that in the step of the Balance route
Before rapid, the step of the battery pack balancing control method also includes the judgement of capacity and voltage, the capacity and voltage are sentenced
Disconnected step includes：
1) the actual active volume and the error amount of the capacity threshold of setting of battery pack are calculated, volume error value is designated as；
2) when first threshold value of the volume error value more than or equal to setting, calculate any two battery module and filling
The voltage error value of synchronization in electric process or in discharge process；
3) when have in the voltage error value of any two battery module at least one voltage error value more than or equal to setting
During the second threshold value, implement the Balance route the step of.
4. battery pack balancing control method according to claim 3, it is characterised in that the synchronization is charging complete
Previous moment or electric discharge complete previous moment.
5. battery pack balancing control method according to claim 1 and 2, it is characterised in that if the first battery module and
Second battery module is same battery module, then Balance route terminates, and judges that the battery module is fail battery module.
6. a kind of cell balance control unit, it is characterised in that including equalization control module, the equalization control module includes
With lower unit：
Acquiring unit, for obtaining the battery module that charging is initially completed in charging process, is designated as the first battery module, and
The battery module of electric discharge is initially completed in discharge process, the second battery module is designated as；
Judging unit, for judging whether the first battery module and the second battery module are same battery modules；
Balanced unit, for if not same battery module, then by the energy transfer in the first battery module to the second battery
In module；
Wherein, it is described to be initially completed charging and refer to：There is charge protection at first or in charging complete previous moment voltage highest；
It is described to be initially completed electric discharge and refer to：There is discharge prevention at first or to complete previous moment voltage in electric discharge minimum.
7. cell balance control unit according to claim 6, it is characterised in that the monomer electricity in the battery module
The number in pond is one.
8. the cell balance control unit according to claim 6 or 7, it is characterised in that the control device also includes
Capacity and voltage judge module, the capacity and voltage judge module are included with lower unit：
First processing units, for calculating the actual active volume of battery pack and the error amount of the capacity threshold of setting, are designated as holding
Amount error amount；
Second processing unit, for when the volume error value is more than or equal to the first threshold value for setting, calculating any
The voltage error value of two battery modules synchronization in charging process or in discharge process；
3rd processing unit, for having at least one voltage error value to be more than in the voltage error value for working as any two battery module
Or during equal to the second threshold value for setting, implement Balance route.
9. cell balance control unit according to claim 8, it is characterised in that the synchronization is charging complete
Previous moment or electric discharge complete previous moment.
10. the cell balance control unit according to claim 6 or 7, it is characterised in that if the first battery module and
Second battery module is same battery module, then Balance route terminates, and judges that the battery module is fail battery module.
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Cited By (7)
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| CN107785967A (en) * | 2017-11-21 | 2018-03-09 | 中航锂电（洛阳）有限公司 | Accumulation power supply system capacity balance control method, control device and equalizing system |
| CN109450022A (en) * | 2018-11-16 | 2019-03-08 | 东莞塔菲尔新能源科技有限公司 | A kind of equalization methods of battery pack |
| CN110880622A (en) * | 2019-10-15 | 2020-03-13 | 江西恒动新能源有限公司 | Equalization control method of battery pack |
| CN111864844A (en) * | 2020-07-27 | 2020-10-30 | 中航锂电（洛阳）有限公司 | Equalization method and equalization device of battery system and intelligent equipment |
| CN113696786A (en) * | 2021-08-23 | 2021-11-26 | 深圳市道通科技股份有限公司 | Battery equalization method and system |
| CN116054349A (en) * | 2023-02-28 | 2023-05-02 | 深圳市比比赞科技有限公司 | Photovoltaic energy storage battery pack voltage control protection system |
| CN117081219A (en) * | 2023-10-17 | 2023-11-17 | 东方旭能(山东)科技发展有限公司 | EMS energy storage energy management system |
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