CN116345646A - Battery equalization method, system and storage medium - Google Patents

Battery equalization method, system and storage medium Download PDF

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Publication number
CN116345646A
CN116345646A CN202310623926.5A CN202310623926A CN116345646A CN 116345646 A CN116345646 A CN 116345646A CN 202310623926 A CN202310623926 A CN 202310623926A CN 116345646 A CN116345646 A CN 116345646A
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battery
voltage
cell
equalization
charging
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金敏
陆红
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Jiangsu Zenergy Battery Technologies Co Ltd
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Jiangsu Zenergy Battery Technologies Co Ltd
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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
    • 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
    • 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
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • 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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  • 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)
  • Microelectronics & Electronic Packaging (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to the technical field of batteries, and discloses a battery balancing method, a system and a storage medium, wherein the battery balancing method comprises the following steps: determining that the battery meets the triggering condition of voltage balance, and charging all the battery cells in the battery once until the charge state of at least one battery cell is 100%; determining the battery cells needing to be subjected to voltage equalization in the battery according to the voltage difference between each battery cell in the battery and the battery cell with the largest voltage after primary charging; secondary charging is carried out on the battery cores needing to be subjected to voltage equalization until the charge state of at least one battery core is 100%; according to the voltage difference between each cell in the battery and the cell with the largest voltage after secondary charging, determining the cell needing voltage equalization in the battery again; and continuing to charge and calculating the voltage difference until all the battery cores needing to be subjected to voltage equalization in the battery finish voltage equalization. The invention can greatly improve the charging efficiency and save the power resources.

Description

Battery equalization method, system and storage medium
Technical Field
The invention relates to the technical field of batteries, in particular to a battery equalization method and system and a storage medium.
Background
In recent years, the market share of power batteries is larger and larger, and as the service time is increased, the battery performance is gradually deteriorated due to consistency difference, and the battery capacity is seriously attenuated due to the influence of the barrel effect.
Currently, the mainstream battery equalization method in the market mostly adopts a one-to-one mode for equalization, and the method has the problem of low equalization efficiency. For example, in the document CN101777784a, equalization is achieved by setting a charging branch to charge each single battery to be equalized separately, and the charging efficiency is difficult to meet the requirement due to the need of one-to-one individual charging, and especially when the number of the electric cores in the battery is too large, the problem of low charging efficiency is more obvious. Therefore, a new battery balancing scheme is needed to solve the above problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing a battery balancing method which can effectively improve the consistency of battery cells and has high charging efficiency.
In order to solve the technical problems, the invention provides a battery balancing method, wherein the battery comprises a plurality of battery cells connected in series, and the battery balancing method comprises the following steps:
determining that the battery meets a triggering condition of voltage balance, and charging all the battery cells in the battery once until the State of Charge (SOC) of at least one battery cell is 100%;
determining the battery cells needing to be subjected to voltage equalization in the battery according to the voltage difference between each battery cell in the battery and the battery cell with the largest voltage after primary charging;
secondary charging is carried out on the battery cores needing to be subjected to voltage equalization until the charge state of at least one battery core is 100%;
according to the voltage difference between each cell in the battery and the cell with the largest voltage after secondary charging, determining the cell needing voltage equalization in the battery again;
and continuing to charge and calculating the voltage difference until all the battery cores needing to be subjected to voltage equalization in the battery finish voltage equalization.
In one embodiment of the present invention, the determining that the battery meets the triggering condition of voltage equalization includes:
acquiring the charge states of all the electric cores in the battery, calculating the average charge states of all the electric cores, and determining a first differential pressure threshold according to the average charge states;
and when the voltage difference between the cell with the largest voltage and the cell with the smallest voltage in the battery is larger than or equal to the first voltage difference threshold value, determining that the battery meets the triggering condition of voltage balance.
In one embodiment of the invention, the charging current is adjusted during each charging process according to the state of charge of the highest voltage cell of the charged cells.
In one embodiment of the present invention, the adjusting the charging current according to the state of charge of the highest voltage cell among the charged cells includes:
when the charge state of the battery cell with the highest voltage in the charged battery cells is (0, 30% ], the charging current is less than or equal to 0.2C;
when the charge state of the battery cell with the highest voltage in the charged battery cells is (30 percent, 60 percent), the charging current is less than or equal to 0.5C;
when the charge state of the battery cell with the highest voltage in the charged battery cells is (60 percent, 85 percent), the charging current is less than or equal to 0.33C;
when the charge state of the cell with the highest voltage in the charged cells is (85%, 100% ], the charging current is 0.1C.
In one embodiment of the present invention, the determining the cell in the battery that needs to perform voltage equalization according to the voltage difference between each cell in the battery and the cell with the largest voltage after one charging includes:
and calculating the voltage difference between each cell in the battery and the cell with the largest voltage after one-time charging, and determining the cell with the voltage difference larger than a second voltage difference threshold value as the cell needing voltage equalization in the battery.
In one embodiment of the present invention, after the secondary charging and each subsequent charging, a voltage difference between each cell in the battery and a cell with the largest voltage after the charging is calculated, and a cell with a voltage difference greater than a second voltage difference threshold is determined as a cell in the battery that needs to be subjected to voltage equalization.
In one embodiment of the present invention, after each charge, before calculating the differential pressure, the method further comprises: the battery was allowed to stand for a target time.
The invention also provides a battery balancing system, wherein the battery comprises a plurality of battery cells connected in series, and the battery balancing system comprises a first determining module, a charging module and a second determining module:
the first determining module is used for determining that the battery meets the triggering condition of voltage balance;
the charging module is used for charging all the battery cells in the battery once until the charge state of at least one battery cell is 100%;
the second determining module is configured to determine a cell in the battery that needs to be balanced in voltage according to a voltage difference between each cell in the battery and a cell with the largest voltage after one-time charging;
the charging module is used for secondary charging of the battery cells needing voltage equalization until the charge state of at least one battery cell is 100%;
the second determining module is further configured to re-determine a cell in the battery that needs to be balanced according to a voltage difference between each cell in the battery and a cell with a maximum voltage after secondary charging;
the charging module is also used for continuously charging the battery cells needing voltage equalization;
and the second determining module is also used for calculating the voltage difference after continuous charging until all the battery cores needing voltage balancing in the battery complete the voltage balancing.
In one embodiment of the invention, each cell corresponds to a first equalization switch and a second equalization switch, each cell is connected in series with the corresponding first equalization switch and then connected in parallel with the corresponding second equalization switch, and all the second equalization switches are connected in series.
In one embodiment of the present invention, after each charging, for the cells in the battery that do not require voltage equalization, the corresponding first equalization switches are opened and the corresponding second equalization switches are closed.
The present invention also provides a storage medium having stored thereon a computer program for execution by a processor of the battery equalization method according to any one of the above.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the battery balancing method, the battery cells needing voltage balancing in the battery are uniformly charged, and the battery cells needing voltage balancing are screened again after each charging, so that uniform charging is continued until all the battery cells needing voltage balancing are subjected to voltage balancing, the charging efficiency can be greatly improved, the consistency of the battery cells is effectively improved, meanwhile, the waste of electric power resources is avoided, and the energy utilization rate of the battery cells is improved.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings, in which
FIG. 1 is a flow chart of a battery equalization method in an embodiment of the invention;
FIG. 2 is a schematic diagram of a charging current corresponding to a state of charge of a highest voltage cell among the cells during charging according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a battery equalization system in accordance with another embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Example 1
The embodiment discloses a battery equalization method, the battery includes a plurality of electric cores connected in series, the battery equalization method includes:
and step S1, determining that the battery meets the triggering condition of voltage balance, and charging all the electric cores in the battery once until the charge state of at least one electric core is 100%.
Optionally, the determining that the battery meets the triggering condition of voltage equalization includes:
step S11, acquiring the charge states of all the battery cells in the battery, calculating the average charge state SOC_av1 of all the battery cells, and determining a first differential pressure threshold delta V_begin according to the average charge state;
and step S12, when the voltage difference between the cell with the largest voltage and the cell with the smallest voltage in the battery is larger than or equal to the first voltage difference threshold value, determining that the battery meets the triggering condition of voltage balance.
Optionally, the battery is detected by a battery management system (Battery Manage system, BMS) to obtain the state of charge of all the cells in the battery.
The first differential pressure threshold delta V_begin can be obtained according to an SOC-differential pressure comparison table, in the SOC-differential pressure comparison table, each SOC corresponds to one differential pressure threshold, and when the differential pressure between a cell with the largest voltage and a cell with the smallest voltage in the battery is larger than or equal to the corresponding differential pressure threshold, the battery is determined to meet the triggering condition of voltage balance; otherwise, the battery does not need to be subjected to voltage equalization and is charged normally. Specifically, referring to table 1, a battery SOC-differential pressure reference table is shown. Wherein, each noun is explained as follows:
initial capacity is extremely poor: representing the difference between the maximum and minimum values of all cell capacities in the whole battery;
single cell initial state: representing the initial SOC state of the battery cell when the battery cell is assembled into a battery pack;
differential pressure: if the first differential voltage value is 166mV, which means that the capacity of the whole battery is extremely poor at 6Ah, and the initial SOC of the battery core is 100%, the differential voltage threshold value for starting charging is 166mV from 0% SOC in the battery cycle process.
As can be seen from table 1, each SOC corresponds to a differential pressure threshold value, and when the initial capacity of the battery is extremely different, the differential pressure threshold value corresponding to the SOC is also different. It should be noted that table 1 only lists SOC-differential pressure maps of one type of battery, and there may be differences between SOC-differential pressure maps of different types of batteries, which should not be taken as limiting the battery in the present invention.
TABLE 1
Figure SMS_1
And S2, determining the battery cells needing to be subjected to voltage equalization in the battery according to the voltage difference between each battery cell in the battery and the battery cell with the largest voltage after one-time charging. Optionally, step S2 includes:
and calculating the voltage difference between each cell in the battery and the cell with the largest voltage after one-time charging, and determining the cell with the voltage difference larger than a second voltage difference threshold value as the cell needing voltage equalization in the battery.
The specific value of the second differential pressure threshold may be set as required, which is not specifically limited. Further, the specific value of the second voltage difference threshold may be adjusted according to the voltage level when the state of charge of the battery cell is 100%, for example, when the voltage level when the state of charge of the battery cell is 100% is relatively large, the second voltage difference threshold may be appropriately increased, and when the voltage level when the state of charge of the battery cell is 100% is relatively small, the second voltage difference threshold may be appropriately decreased.
In one embodiment, after each charge, before calculating the differential pressure, the method further comprises: the battery was allowed to stand for a target time.
And S3, secondary charging is carried out on the battery cells needing to be subjected to voltage equalization until the charge state of at least one battery cell is 100%.
And S4, re-determining the battery cells needing to be subjected to voltage equalization in the battery according to the voltage difference between each battery cell in the battery and the battery cell with the largest voltage after secondary charging.
And S5, continuing to charge and calculating the voltage difference until all the battery cores needing to be subjected to voltage equalization in the battery finish voltage equalization.
Optionally, after the secondary charging and each subsequent charging, calculating a voltage difference between each cell in the battery after the charging and a cell with the largest voltage, and determining a cell with the voltage difference greater than a second voltage difference threshold as a cell in the battery, wherein the voltage difference needs to be balanced.
In order to reduce the polarization reaction of the battery during the charging process, optionally, during each charging process, the charging current is adjusted according to the state of charge of the battery cell with the highest voltage in the charged battery cells.
Referring to fig. 2, in one embodiment, the adjusting the charging current according to the state of charge of the highest voltage cell of the charged cells includes:
when the charge state of the battery cell with the highest voltage in the charged battery cells is (0, 30% ], the charging current is less than or equal to 0.2C;
when the charge state of the battery cell with the highest voltage in the charged battery cells is (30 percent, 60 percent), the charging current is less than or equal to 0.5C;
when the charge state of the battery cell with the highest voltage in the charged battery cells is (60 percent, 85 percent), the charging current is less than or equal to 0.33C;
when the charge state of the cell with the highest voltage in the charged cells is (85%, 100% ], the charging current is 0.1C.
Further, after each charging, before calculating the differential pressure, the method further comprises: and standing the battery for target time to keep the voltage stable so as to obtain a more accurate voltage value.
Further, if after primary or secondary charging, all cells in the battery do not need to be voltage equalized again, no further charging is needed.
According to the battery balancing method, the battery cells needing voltage balancing in the battery are uniformly charged, and the battery cells needing voltage balancing are screened again after each charging, so that uniform charging is continued until all the battery cells needing voltage balancing are subjected to voltage balancing, the charging efficiency can be greatly improved, the consistency of the battery cells is effectively improved, meanwhile, the waste of electric power resources is avoided, and the energy utilization rate of the battery cells is improved.
Example two
The embodiment provides a battery equalization system, the battery includes a plurality of electric cores that establish ties, the battery equalization system includes first determination module, charging module and second determination module:
the first determining module is used for determining that the battery meets the triggering condition of voltage balance;
the charging module is used for charging all the battery cells in the battery once until the charge state of at least one battery cell is 100%;
the second determining module is configured to determine a cell in the battery that needs to be balanced in voltage according to a voltage difference between each cell in the battery and a cell with the largest voltage after one-time charging;
the charging module is used for secondary charging of the battery cells needing voltage equalization until the charge state of at least one battery cell is 100%;
the second determining module is further configured to re-determine a cell in the battery that needs to be balanced according to a voltage difference between each cell in the battery and a cell with a maximum voltage after secondary charging;
the charging module is also used for continuously charging the battery cells needing voltage equalization;
and the second determining module is also used for calculating the voltage difference after continuous charging until all the battery cores needing voltage balancing in the battery complete the voltage balancing.
In one embodiment, each cell corresponds to a first equalization switch and a second equalization switch, each cell is connected in series with the corresponding first equalization switch and then connected in parallel with the corresponding second equalization switch, and all the second equalization switches are connected in series. Referring to fig. 3, the battery includes cells C1, C2, …, cn, where the cell C1 corresponds to a first equalization switch S1.1 and a second equalization switch S1.2, the cell C2 corresponds to a first equalization switch S2.1 and a second equalization switch S2.2, and the cell Cn corresponds to a first equalization switch sn.1 and a second equalization switch sn.2.
Further, after each charging, for the battery cells in the battery which do not need to be subjected to voltage equalization, the corresponding first equalization switches are opened, and the corresponding second equalization switches are closed. For example, after one-time charging, the cells which do not need to be subjected to voltage equalization are C1 and C2, the first equalization switches S1.1 and S2.1 are opened, the second equalization switches S1.2 and S2.2 are closed, that is, the cells which do not need to be subjected to voltage equalization are short-circuited for C1 and C2, and the remaining cells which need to be subjected to voltage equalization are continuously subjected to equalizing charging.
Optionally, the first equalization switches S1.1, S2.1, …, sn.1.1, and the second equalization switches S1.2, S2.2, …, n.2 may be relays, integrated gate commutating transistors, MOS field effect transistors, insulated gate bipolar transistors, or the like.
The battery equalization system in the embodiment of the present invention is used to implement the foregoing battery equalization method, so that the detailed description of the system can be found in the foregoing example portion of the battery equalization method, and therefore, the detailed description thereof can refer to the corresponding description of the examples in each portion, and will not be further described herein.
In addition, since the battery equalization system of the present embodiment is used to implement the foregoing battery equalization method, the functions thereof correspond to those of the foregoing method, and will not be described herein.
Example III
The present embodiment provides a storage medium having stored thereon a computer program that is executed by a processor to perform the battery equalization method of any one of the above.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.

Claims (11)

1. A method of balancing a battery comprising a plurality of cells connected in series, comprising:
determining that the battery meets the triggering condition of voltage balance, and charging all the battery cells in the battery once until the charge state of at least one battery cell is 100%;
determining the battery cells needing to be subjected to voltage equalization in the battery according to the voltage difference between each battery cell in the battery and the battery cell with the largest voltage after primary charging;
secondary charging is carried out on the battery cores needing to be subjected to voltage equalization until the charge state of at least one battery core is 100%;
according to the voltage difference between each cell in the battery and the cell with the largest voltage after secondary charging, determining the cell needing voltage equalization in the battery again;
and continuing to charge and calculating the voltage difference until all the battery cores needing to be subjected to voltage equalization in the battery finish voltage equalization.
2. The battery equalization method of claim 1, wherein said determining that the battery meets a triggering condition for voltage equalization comprises:
acquiring the charge states of all the electric cores in the battery, calculating the average charge states of all the electric cores, and determining a first differential pressure threshold according to the average charge states;
and when the voltage difference between the cell with the largest voltage and the cell with the smallest voltage in the battery is larger than or equal to the first voltage difference threshold value, determining that the battery meets the triggering condition of voltage balance.
3. The battery equalization method of claim 1, wherein: in each charging process, the charging current is adjusted according to the charge state of the battery cell with the highest voltage in the charged battery cells.
4. The battery equalization method of claim 3, wherein: the step of adjusting the charging current according to the state of charge of the battery cell with the highest voltage in the charged battery cells comprises the following steps:
when the charge state of the battery cell with the highest voltage in the charged battery cells is (0, 30% ], the charging current is less than or equal to 0.2C;
when the charge state of the battery cell with the highest voltage in the charged battery cells is (30 percent, 60 percent), the charging current is less than or equal to 0.5C;
when the charge state of the battery cell with the highest voltage in the charged battery cells is (60 percent, 85 percent), the charging current is less than or equal to 0.33C;
when the charge state of the cell with the highest voltage in the charged cells is (85%, 100% ], the charging current is 0.1C.
5. The battery equalization method of claim 1, wherein: the determining the cell in the battery which needs to be balanced according to the voltage difference between each cell in the battery and the cell with the largest voltage after one-time charging comprises the following steps:
and calculating the voltage difference between each cell in the battery and the cell with the largest voltage after one-time charging, and determining the cell with the voltage difference larger than a second voltage difference threshold value as the cell needing voltage equalization in the battery.
6. The battery equalization method of claim 1, wherein: after the secondary charge and each subsequent charge,
and calculating the voltage difference between each cell in the battery and the cell with the largest voltage after charging, and determining the cell with the voltage difference larger than a second voltage difference threshold value as the cell needing voltage equalization in the battery.
7. The battery equalization method of claim 1, wherein: after each charge, before calculating the differential pressure, further comprising: the battery was allowed to stand for a target time.
8. The battery equalization system is characterized by comprising a first determination module, a charging module and a second determination module, wherein the battery comprises a plurality of battery cells connected in series:
the first determining module is used for determining that the battery meets the triggering condition of voltage balance;
the charging module is used for charging all the battery cells in the battery once until the charge state of at least one battery cell is 100%;
the second determining module is configured to determine a cell in the battery that needs to be balanced in voltage according to a voltage difference between each cell in the battery and a cell with the largest voltage after one-time charging;
the charging module is used for secondary charging of the battery cells needing voltage equalization until the charge state of at least one battery cell is 100%;
the second determining module is further configured to re-determine a cell in the battery that needs to be balanced according to a voltage difference between each cell in the battery and a cell with a maximum voltage after secondary charging;
the charging module is also used for continuously charging the battery cells needing voltage equalization;
and the second determining module is also used for calculating the voltage difference after continuous charging until all the battery cores needing voltage balancing in the battery complete the voltage balancing.
9. The battery equalization system of claim 8, wherein: each cell corresponds to a first equalization switch and a second equalization switch, each cell is connected in series with the corresponding first equalization switch and then connected in parallel with the corresponding second equalization switch, and all the second equalization switches are connected in series.
10. The battery equalization system of claim 9, wherein: and after each charging, for the battery cells which do not need to be subjected to voltage equalization in the battery, opening the corresponding first equalization switch, and closing the corresponding second equalization switch.
11. A storage medium having stored thereon a computer program, characterized in that the computer program is executed by a processor for a battery equalization method according to any of claims 1-7.
CN202310623926.5A 2023-05-30 2023-05-30 Battery equalization method, system and storage medium Pending CN116345646A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102088118A (en) * 2010-12-28 2011-06-08 深圳市航盛电子股份有限公司 Battery management system, electric vehicle and state-of-charge estimation method
CN104600799A (en) * 2015-01-09 2015-05-06 深圳市理邦精密仪器股份有限公司 Balancing circuit and method of series battery pack
CN112952224A (en) * 2019-12-11 2021-06-11 南京德朔实业有限公司 Battery pack and charging balance method and system thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102088118A (en) * 2010-12-28 2011-06-08 深圳市航盛电子股份有限公司 Battery management system, electric vehicle and state-of-charge estimation method
CN104600799A (en) * 2015-01-09 2015-05-06 深圳市理邦精密仪器股份有限公司 Balancing circuit and method of series battery pack
CN112952224A (en) * 2019-12-11 2021-06-11 南京德朔实业有限公司 Battery pack and charging balance method and system thereof

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