CN117013110A - Battery pack equalization method and device - Google Patents

Battery pack equalization method and device Download PDF

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Publication number
CN117013110A
CN117013110A CN202310993809.8A CN202310993809A CN117013110A CN 117013110 A CN117013110 A CN 117013110A CN 202310993809 A CN202310993809 A CN 202310993809A CN 117013110 A CN117013110 A CN 117013110A
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CN
China
Prior art keywords
battery
balanced
target
battery range
range
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Pending
Application number
CN202310993809.8A
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Chinese (zh)
Inventor
李明星
杨冬强
黄灿
王文义
江海
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Hangzhou Huasu Technology Co ltd
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Hangzhou Huasu Technology Co ltd
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Priority to CN202310993809.8A priority Critical patent/CN117013110A/en
Publication of CN117013110A publication Critical patent/CN117013110A/en
Pending legal-status Critical Current

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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
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • 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
    • H02J7/0013—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
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • 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)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application discloses a battery pack balancing method and device, relates to the technical field of batteries, and solves the problem that the efficiency of the existing battery pack balancing method is low. The specific scheme comprises the following steps: dividing a battery pack to be balanced to generate a plurality of battery range packs; each battery range group comprises a plurality of batteries to be balanced; determining a target battery range group from a plurality of battery range groups according to the number of batteries to be balanced in each battery range group; and carrying out capacity equalization on the batteries to be equalized in the target battery range group.

Description

Battery pack equalization method and device
Technical Field
The application relates to the technical field of batteries, in particular to a battery pack equalization method and device.
Background
Currently, many systems use a battery pack formed by connecting a plurality of batteries in series, and when the batteries in the battery pack are used for a period of time, the batteries are inconsistent in terms of manufacturing process, initial capacity and the like, so that capacity differences among the batteries are caused after the batteries are used. Therefore, it is necessary to balance the capacities of the respective batteries in the battery pack, thereby maintaining the consistency of the entire battery pack and improving the service lives of the batteries.
In the prior art, a passive equalization mode is generally adopted to perform equalization of a battery pack, specifically, a resistor is used to discharge a battery with higher voltage in the battery pack, and charge a battery with lower voltage, so that the capacity equalization of the battery in the whole battery pack is finally achieved.
However, the efficiency of using the above-described battery equalization method is low.
Disclosure of Invention
The application provides a battery pack balancing method and device, which can solve the problem of lower efficiency of the existing battery pack balancing method.
In order to achieve the above purpose, the application adopts the following technical scheme:
an embodiment of the present application provides a battery pack equalization method, including:
dividing a battery pack to be balanced to generate a plurality of battery range packs; each battery range group comprises a plurality of batteries to be balanced;
determining a target battery range group from a plurality of battery range groups according to the number of batteries to be balanced in each battery range group;
and carrying out capacity equalization on the batteries to be equalized in the target battery range group.
In one possible implementation, dividing the battery packs to be equalized to generate a plurality of battery range packs includes:
acquiring voltage data of each battery to be balanced in the battery pack to be balanced;
dividing the battery pack to be balanced based on the plurality of voltage data to generate a plurality of battery range groups.
In one possible implementation, dividing the battery pack to be equalized based on the plurality of voltage data to generate a plurality of battery range groups includes:
determining a maximum voltage value and a minimum voltage value from the plurality of voltage data;
calculating a difference between the maximum voltage value and the minimum voltage value;
calculating the number of battery range groups according to the difference value and a preset dividing step length;
a plurality of battery range groups are generated according to the maximum voltage value, the minimum voltage value and the number of the battery range groups.
In one possible embodiment, the method further comprises:
acquiring the number of battery range groups;
and if the number of the battery range groups is greater than a preset number threshold, starting battery group equalization.
In one possible embodiment, determining the target battery range group from the plurality of battery range groups according to the number of batteries to be equalized in each battery range group includes:
acquiring voltage data of each battery to be balanced in the battery pack to be balanced;
classifying each voltage data according to the voltage range value of each battery range group to obtain a plurality of battery range groups containing the voltage data;
the number of voltage data in each battery range group is compared, and the battery range group having the largest number of voltage data is set as the target battery range group.
In one possible embodiment, performing capacity equalization on the cells to be equalized in the target cell range group includes:
determining a target voltage value from a plurality of voltage data in the target battery range group;
for each voltage data, charging the battery to be balanced, wherein the voltage data is lower than the target voltage value, until the difference between the voltage data of the battery to be balanced after charging and the target voltage value is within a preset voltage threshold range;
discharging the battery to be balanced, the voltage data of which is higher than the target voltage value, until the difference between the voltage data of the battery to be balanced after discharging and the target voltage value is within a preset voltage threshold range.
In one possible embodiment, determining a target voltage value from a plurality of voltage data in a target battery range group includes:
and carrying out averaging processing on a plurality of voltage data in the target battery range group to obtain an average voltage value, and taking the average voltage value as a target voltage value.
In one possible embodiment, performing capacity equalization on the cells to be equalized in the target cell range group includes:
determining a preset number of target batteries to be balanced from the batteries to be balanced in the target battery range group;
and carrying out capacity equalization on the plurality of target batteries to be equalized.
In one possible embodiment, the method further comprises:
dividing the batteries to be balanced which are not subjected to capacity equalization in other battery range groups and target battery range groups again to generate a plurality of new battery range groups; the other battery range groups are battery range groups other than the target battery range group among the plurality of battery range groups;
determining a new target battery range group from the new multiple battery range groups according to the number of the batteries to be balanced in each new battery range group;
and carrying out capacity equalization on the batteries to be equalized in the new target battery range group, and repeatedly executing the battery group equalization method until the number of the new multiple battery range groups is smaller than or equal to a preset number threshold value, and closing battery group equalization.
A second aspect of an embodiment of the present application provides a battery equalization apparatus, including:
the generation module is used for dividing the battery packs to be balanced to generate a plurality of battery range packs; each battery range group comprises a plurality of batteries to be balanced;
the determining module is used for determining a target battery range group from a plurality of battery range groups according to the quantity of the batteries to be balanced in each battery range group;
and the balancing module is used for carrying out capacity balancing on the batteries to be balanced in the target battery range group.
In one possible implementation, the generating module is specifically configured to:
acquiring voltage data of each battery to be balanced in the battery pack to be balanced;
dividing the battery pack to be balanced based on the plurality of voltage data to generate a plurality of battery range groups.
In one possible implementation, the generating module is further configured to:
determining a maximum voltage value and a minimum voltage value from the plurality of voltage data;
calculating a difference between the maximum voltage value and the minimum voltage value;
calculating the number of battery range groups according to the difference value and a preset dividing step length;
a plurality of battery range groups are generated according to the maximum voltage value, the minimum voltage value and the number of the battery range groups.
In one possible embodiment, the battery equalization device is further configured to:
acquiring the number of battery range groups;
and if the number of the battery range groups is greater than a preset number threshold, starting battery group equalization.
In one possible implementation manner, the determining module is specifically configured to:
acquiring voltage data of each battery to be balanced in the battery pack to be balanced;
classifying each voltage data according to the voltage range value of each battery range group to obtain a plurality of battery range groups containing the voltage data;
the number of voltage data in each battery range group is compared, and the battery range group having the largest number of voltage data is set as the target battery range group.
In one possible implementation manner, the equalization module is specifically configured to:
determining a target voltage value from a plurality of voltage data in the target battery range group;
for each voltage data, charging the battery to be balanced, wherein the voltage data is lower than the target voltage value, until the difference between the voltage data of the battery to be balanced after charging and the target voltage value is within a preset voltage threshold range;
discharging the battery to be balanced, the voltage data of which is higher than the target voltage value, until the difference between the voltage data of the battery to be balanced after discharging and the target voltage value is within a preset voltage threshold range.
In a possible implementation manner, the equalization module is further configured to:
and carrying out averaging processing on a plurality of voltage data in the target battery range group to obtain an average voltage value, and taking the average voltage value as a target voltage value.
In a possible implementation manner, the equalization module is further configured to:
determining a preset number of target batteries to be balanced from the batteries to be balanced in the target battery range group;
and carrying out capacity equalization on the plurality of target batteries to be equalized.
In one possible embodiment, the battery equalization device is further configured to:
dividing the batteries to be balanced which are not subjected to capacity equalization in other battery range groups and target battery range groups again to generate a plurality of new battery range groups; the other battery range groups are battery range groups other than the target battery range group among the plurality of battery range groups;
determining a new target battery range group from the new multiple battery range groups according to the number of the batteries to be balanced in each new battery range group;
and carrying out capacity equalization on the batteries to be equalized in the new target battery range group, and repeatedly executing the battery group equalization method until the number of the new multiple battery range groups is smaller than or equal to a preset number threshold value, and closing battery group equalization.
A third aspect of the embodiment of the present application proposes an electronic device, the electronic device comprising a processor and a memory, where at least one instruction, at least one program, a code set or an instruction set is stored, the at least one instruction, the at least one program, the code set or the instruction set being loaded and executed by the processor to implement the battery pack balancing method according to the first aspect.
A fourth aspect of the embodiments of the present application proposes a computer readable storage medium, in which at least one instruction, at least one program, a code set, or an instruction set is stored, the at least one instruction, the at least one program, the code set, or the instruction set being loaded and executed by a processor to implement the battery pack balancing method according to the first aspect.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
the battery pack equalization method provided by the embodiment of the application comprises the following steps: dividing a battery pack to be balanced to generate a plurality of battery range packs; each battery range group comprises a plurality of batteries to be balanced; determining a target battery range group from a plurality of battery range groups according to the number of batteries to be balanced in each battery range group; and carrying out capacity equalization on the batteries to be equalized in the target battery range group. According to the battery pack balancing method provided by the embodiment of the application, after the whole battery pack to be balanced is divided to obtain a plurality of battery range groups, a corresponding target battery range group is selected for capacity balancing each time, so that the efficiency of balancing the battery packs is improved; in addition, a target battery range group can be directly determined according to the number of the batteries to be balanced in each battery range group, so that the efficiency of determining the target battery range group is improved, and the efficiency of balancing the battery groups is further improved.
Drawings
Fig. 1 is a flowchart of a battery pack balancing method according to an embodiment of the present application;
fig. 2 is a schematic diagram of a battery pack to be balanced according to an embodiment of the present application;
fig. 3 is a flowchart of a method for dividing a battery pack to be balanced according to an embodiment of the present application;
fig. 4 is a flowchart of a method for dividing a battery pack to be balanced according to voltage data according to an embodiment of the present application;
FIG. 5 is a flowchart of a method for determining a target battery range group according to an embodiment of the present application;
fig. 6 is a block diagram of a battery equalization apparatus according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.
In addition, the use of "based on" or "according to" is meant to be open and inclusive, as a process, step, calculation, or other action that is "based on" or "according to" one or more conditions or values may in practice be based on additional conditions or exceeded values.
Embodiments of the application are operational with numerous other general purpose or special purpose computing system environments or configurations with electronic devices, such as terminal devices, computer systems, servers, etc. Examples of well known terminal devices, computing systems, environments, and/or configurations that may be suitable for use with the terminal device, computer system, server, or other electronic device include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, hand-held or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, minicomputer systems, mainframe computer systems, distributed cloud computing environments that include any of the above systems, and the like.
Electronic devices such as terminal devices, computer systems, servers, etc. may be described in the general context of computer system-executable instructions, such as program modules, being executed by a computer system. Generally, program modules may include routines, programs, objects, components, logic, data structures, etc., that perform particular tasks or implement particular abstract data types. The computer system/server may be implemented in a distributed cloud computing environment in which tasks are performed by remote processing devices that are linked through a communications network. In a distributed cloud computing environment, program modules may be located in both local and remote computing system storage media including memory storage devices.
It should be noted that, the execution body of the embodiment of the present application may be a computer device or a battery pack balancing device, and in the following method embodiments, the execution body is described with reference to the computer device.
Fig. 1 is a flowchart of a battery pack balancing method according to an embodiment of the present application, where the method includes:
102, dividing a battery pack to be balanced to generate a plurality of battery range packs; each battery range group comprises a plurality of batteries to be balanced.
Currently, many systems use a battery pack formed by connecting a plurality of batteries in series, and when the batteries in the battery pack are used for a period of time, the batteries are inconsistent in terms of manufacturing process, initial capacity and the like, so that capacity differences among the batteries are caused after the batteries are used. Therefore, it is necessary to balance the capacities of the respective batteries in the battery pack, thereby maintaining the consistency of the entire battery pack and improving the service lives of the batteries.
The battery pack to be balanced can be obtained by a battery pack arrangement scheme which is set in advance according to actual project requirements, as shown in fig. 2, fig. 2 is a schematic diagram of the battery pack to be balanced, where the battery pack to be balanced includes a plurality of batteries to be balanced.
After the battery packs to be balanced are set, the battery packs to be balanced can be divided to generate a plurality of battery range groups, wherein each battery range group comprises a plurality of batteries to be balanced. In some alternative embodiments, when dividing a battery pack to be balanced, as shown in fig. 3, fig. 3 is a flowchart of a method for dividing a battery pack to be balanced according to an embodiment of the present application, where the method includes:
step 302, obtaining voltage data of each battery to be balanced in the battery pack to be balanced.
And 304, dividing the battery packs to be balanced based on the plurality of voltage data to generate a plurality of battery range groups.
The voltage acquisition module is used for acquiring voltage data of all the batteries to be balanced in the battery pack to be balanced, so that the battery pack to be balanced is divided based on the acquired voltage data. In some alternative embodiments, the collected voltage data may be matched to a plurality of voltage ranges set in advance, resulting in a plurality of battery range groups.
In other alternative embodiments, as shown in fig. 4, fig. 4 is a flowchart of a method for dividing a battery pack to be balanced according to voltage data according to an embodiment of the present application, where the method includes:
step 402, determining a maximum voltage value and a minimum voltage value from a plurality of voltage data.
Step 404, calculating a difference between the maximum voltage value and the minimum voltage value.
Step 406, calculating to obtain the number of the battery range groups according to the difference value and the preset dividing step length.
Step 408, generating a plurality of battery range groups according to the maximum voltage value, the minimum voltage value and the number of battery range groups.
The maximum voltage value and the minimum voltage value may be obtained by arranging the collected plurality of voltage data according to a size sequence, and of course, other manners may be adopted to obtain the maximum voltage value and the minimum voltage value, which is not particularly limited in the embodiment of the present application.
After the maximum voltage value and the minimum voltage value are obtained, a difference value can be obtained by differencing the maximum voltage value and the minimum voltage value, namely the polar difference value corresponding to the voltage data. And then calculating the number of the battery range groups through the difference value and a preset dividing step length.
The preset dividing step length can be set in a self-defined manner, alternatively, the difference value can be divided by the preset dividing step length, and the result is taken as an integer to obtain the number of battery range groups, and the integer taking mode can be an upward rounding mode or a downward rounding mode. For example, if the difference is 150mV and the preset dividing step is 50mV, the number of battery range groups is 3.
Finally, a plurality of battery range groups can be generated according to the maximum voltage value, the minimum voltage value and the number of the battery range groups. Illustratively, if the maximum value is 5200mV and the minimum value is 5050mV, then there are three cell range groups of (5050 mV-5100 mV), (5100 mV-5150 mV), and (5150 mV-5200 mV), respectively.
In this embodiment, the number of the battery range groups is determined by using the maximum voltage value and the minimum voltage value, and the plurality of battery range groups are divided, so that the plurality of battery range groups can be quickly and accurately obtained, and the efficiency of balancing the battery groups in the follow-up process is improved.
In some alternative embodiments, after the number of battery range groups is obtained, whether to turn on battery balancing may be selected based on the number of battery range groups. Optionally, by acquiring the number of battery range groups, if the number of battery range groups is greater than a preset number threshold, battery group equalization is started.
The preset number threshold value can be preset in a customized manner, if the number of the obtained battery range groups is larger than the preset number threshold value, the fact that the difference between the maximum voltage value and the minimum voltage value in the voltage data of each battery to be balanced is larger is indicated, and balancing of the battery groups needs to be started. Conversely, if the number of the obtained battery range groups is less than or equal to the preset number threshold, it is indicated that the difference between the maximum voltage value and the minimum voltage value in the voltage data of each battery to be equalized is relatively small, and battery equalization can be turned off.
In this embodiment, the number of battery range groups is used to determine the opening and closing of the battery balance, so as to realize more stable battery balance and further improve the battery balance efficiency.
And 104, determining a target battery range group from the plurality of battery range groups according to the number of the batteries to be balanced in each battery range group.
In some alternative embodiments, according to the number of the batteries to be balanced in each battery range group, one battery range group may be arbitrarily selected as the target battery range group according to the order of the number.
In other alternative embodiments, as shown in fig. 5, fig. 5 is a flowchart of a method for determining a target battery range group according to an embodiment of the present application, where the method includes:
step 502, obtaining voltage data of each battery to be balanced in the battery pack to be balanced.
Step 504, classifying each voltage data according to the voltage range value of each battery range group to obtain a plurality of battery range groups containing the voltage data.
Step 506, comparing the number of voltage data in each battery range group, and taking the battery range group with the largest number of voltage data as the target battery range group.
The voltage acquisition module is used for acquiring voltage data of all the batteries to be balanced in the battery pack to be balanced, and after acquiring the voltage data, the acquired voltage data are respectively classified into the battery range packs in a one-to-one correspondence mode according to the voltage range values of the battery range packs. For example, if 20 voltage data are collected, three battery range groups (5050 mv-5100 mv), (5100 mv-5150 mv) and (5150 mv-5200 mv) are obtained by dividing, then the voltage range values of the three battery range groups are (5050 mv-5100 mv), (5100 mv-5150 mv) and (5150 mv-5200 mv), the 20 voltage data are classified into the three voltage range values one by one, and finally according to the voltage data in each voltage range value, each battery to be balanced corresponding to each battery range group can be determined.
By comparing the number of the voltage data in each battery range group, the battery range group with the largest number of the voltage data is taken as the target battery range group, the target battery range group can be rapidly determined by adopting the number of the voltage data as the reference quantity for determining the target battery range group, and the target battery range group with the largest number of the batteries to be balanced is balanced every time, so that more efficient balancing is realized.
And 106, performing capacity equalization on the batteries to be equalized in the target battery range group.
In some alternative embodiments, a target voltage value may be predefined, where the target voltage value may be different from any one voltage data in the target battery range group, and then charging or discharging all the to-be-balanced batteries in the target battery range group until the target voltage value is reached, so as to finally achieve capacity balancing.
In other alternative embodiments, a target voltage value may be determined from a plurality of voltage data in the target battery range group, and for each voltage data, the battery to be balanced whose voltage data is lower than the target voltage value is charged until the difference between the voltage data of the charged battery to be balanced and the target voltage value is within a preset voltage threshold range; discharging the battery to be balanced, the voltage data of which is higher than the target voltage value, until the difference between the voltage data of the battery to be balanced after discharging and the target voltage value is within a preset voltage threshold range.
Optionally, the target voltage value may be any one voltage data in the target battery range group, and then the battery to be balanced in the target battery range group is charged or discharged until the difference between the voltage data of the battery to be balanced after being charged or discharged and the target voltage value is within a preset voltage threshold range, so as to finally realize capacity balance. For example, the preset voltage threshold range may be less than 0, that is, the voltage data of the battery to be balanced after charging or discharging reaches the target voltage value, or the preset voltage threshold range may be less than a small number, for example, less than 0.5mV, that is, the voltage data of the battery to be balanced after charging or discharging approaches the target voltage value, which is not limited in particular in the embodiment of the present application.
Optionally, the target voltage value may be an intermediate voltage value selected from all the voltage data in the target battery range group, and then the battery to be balanced in the target battery range group is charged or discharged until the difference between the voltage data of the battery to be balanced after being charged or discharged and the target voltage value is within a preset voltage threshold range, so as to finally realize capacity balance.
Alternatively, the target voltage value may be an average voltage value obtained by performing an average calculation on all the voltage data in the target battery range group, alternatively, an average voltage value may be obtained by performing an average process on a plurality of voltage data in the target battery range group, and the average voltage value is taken as the target voltage value. And then carrying out charge or discharge operation on the batteries to be balanced in the target battery range group until the difference between the voltage data of the charged or discharged batteries to be balanced and the target voltage value is within a preset voltage threshold range, and finally realizing capacity balance.
Alternatively, when the battery to be balanced in the target battery range group is charged or discharged, a charging time or discharging time may be preset, and an intermediate range group may be determined from the plurality of battery range groups, where the charging time or discharging time may be reduced if the target battery range group is closer to the intermediate range group, and the charging time or discharging time may be increased if the target battery range group is farther from the intermediate range group. The middle range group is a battery range group in which a plurality of battery range groups are arranged according to the size sequence of the voltage data and then are positioned in the middle. For example, three battery range groups (5050 mV-5100 mV), (5100 mV-5150 mV) and (5150 mV-5200 mV) are obtained by dividing, and then (5100 mV-5150 mV) is the middle range group.
In this embodiment, by selecting an average voltage value to perform capacity equalization on the to-be-equalized batteries, all to-be-equalized batteries can be rapidly charged or discharged to the average voltage value, so that the efficiency of performing equalization on the battery pack is improved.
In some optional embodiments, when performing capacity balancing, a preset number of target to-be-balanced batteries may also be determined from to-be-balanced batteries in the target battery range group; and carrying out capacity equalization on the plurality of target batteries to be equalized.
The preset number may be set in a customized manner, and may be set to be, for example, 20% of the total number of all the batteries to be equalized in the target battery range group. Therefore, when the capacity balancing is performed, only 20% of the batteries to be balanced in the target battery range group can be subjected to the capacity balancing, and the fluctuation of the battery group caused when all the batteries to be balanced in the target battery range group are subjected to the capacity balancing at the same time can be avoided.
Optionally, when 20% of the batteries to be balanced are selected, 20% of the batteries to be balanced can be arbitrarily selected from the target battery range group to serve as target batteries to be balanced.
Alternatively, after comparing the voltage data of each battery to be balanced with the target voltage value, the battery to be balanced with the first 20% of the difference value larger is selected as the target battery to be balanced.
Of course, other ways may be adopted to select 20% of the cells to be balanced as the target cells to be balanced, which is not particularly limited in the embodiment of the present application.
In some alternative embodiments, after a round of battery equalization has been performed, i.e., after equalization of a target battery range group containing the greatest amount of voltage data, the above process may be repeated until a condition for closing the battery equalization is reached. Optionally, the battery to be balanced, which is not subjected to capacity balancing in other battery range groups and the target battery range group, can be divided again to generate a plurality of new battery range groups; the other battery range groups are battery range groups other than the target battery range group among the plurality of battery range groups; determining a new target battery range group from the new multiple battery range groups according to the number of the batteries to be balanced in each new battery range group; and carrying out capacity equalization on the batteries to be equalized in the new target battery range group, and repeatedly executing the battery group equalization method until the number of the new multiple battery range groups is smaller than or equal to a preset number threshold value, and closing battery group equalization.
After the battery pack is balanced for one round, the acquisition module can not acquire the voltage data of the balanced battery in the next round of balancing process. And dividing the batteries to be balanced which are not subjected to capacity equalization in other battery range groups and the target battery range group again according to the collected voltage data of the batteries to be balanced, generating a plurality of new battery range groups, and carrying out the subsequent capacity equalization process. The implementation of this procedure may refer to the above-mentioned embodiments, and will not be described here again.
The battery pack equalization method provided by the embodiment of the application comprises the following steps: dividing a battery pack to be balanced to generate a plurality of battery range packs; each battery range group comprises a plurality of batteries to be balanced; determining a target battery range group from a plurality of battery range groups according to the number of batteries to be balanced in each battery range group; and carrying out capacity equalization on the batteries to be equalized in the target battery range group. According to the battery pack balancing method provided by the embodiment of the application, after the whole battery pack to be balanced is divided to obtain a plurality of battery range groups, a corresponding target battery range group is selected for capacity balancing each time, so that the efficiency of balancing the battery packs is improved; in addition, a target battery range group can be directly determined according to the number of the batteries to be balanced in each battery range group, so that the efficiency of determining the target battery range group is improved, and the efficiency of balancing the battery groups is further improved.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Fig. 6 is a block diagram of a battery equalization apparatus according to an embodiment of the present application.
As shown in fig. 6, the battery pack equalization apparatus 600 includes:
the generating module 602 is configured to divide the battery packs to be balanced to generate a plurality of battery range groups; each battery range group comprises a plurality of batteries to be balanced.
A determining module 604, configured to determine a target battery range group from a plurality of battery range groups according to the number of batteries to be equalized in each battery range group.
And the balancing module 606 is used for performing capacity balancing on the batteries to be balanced in the target battery range group.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein. The various modules in the network security appliance described above may be implemented in whole or in part by software, hardware, or a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may invoke and perform the operations of the above modules.
The embodiment of the application also provides an electronic device, which comprises a processor and a memory, wherein at least one instruction, at least one section of program, a code set or an instruction set is stored in the memory, and the at least one instruction, the at least one section of program, the code set or the instruction set is loaded and executed by the processor to realize the steps of the embodiments of the method.
The implementation principle and technical effects of the electronic device provided by the embodiment of the present application are similar to those of the above-mentioned method embodiment, and are not described herein again.
Embodiments of the present application also provide a computer readable storage medium having stored therein at least one instruction, at least one program, code set, or instruction set, the at least one instruction, at least one program, code set, or instruction set being loaded and executed by a processor to implement the steps of the various embodiments of the method as described above.
The computer readable storage medium provided in this embodiment has similar principles and technical effects to those of the above method embodiment, and will not be described herein.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer-executable instructions are loaded and executed on a computer, the processes or functions in accordance with embodiments of the present application are fully or partially produced. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, a website, computer, server, or data center via a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. Computer readable storage media can be any available media that can be accessed by a computer or data storage devices including one or more servers, data centers, etc. that can be integrated with the media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. A method of battery equalization, the method comprising:
dividing a battery pack to be balanced to generate a plurality of battery range packs; each battery range group comprises a plurality of batteries to be balanced;
determining a target battery range group from the plurality of battery range groups according to the number of batteries to be balanced in each battery range group;
and carrying out capacity equalization on the batteries to be equalized in the target battery range group.
2. The method of claim 1, wherein the dividing the battery packs to be equalized to generate a plurality of battery range packs comprises:
acquiring voltage data of each battery to be balanced in the battery pack to be balanced;
dividing the battery packs to be balanced based on a plurality of the voltage data to generate a plurality of battery range packs.
3. The method of claim 2, wherein the dividing the battery packs to be equalized based on a plurality of the voltage data to generate the plurality of battery range packs comprises:
determining a maximum voltage value and a minimum voltage value from a plurality of the voltage data;
calculating a difference between the maximum voltage value and the minimum voltage value;
according to the difference value and a preset dividing step length, calculating the number of battery range groups;
and generating the plurality of battery range groups according to the maximum voltage value, the minimum voltage value and the number of the battery range groups.
4. A method according to any one of claims 1-3, wherein the method further comprises:
acquiring the number of the battery range groups;
and if the number of the battery range groups is larger than a preset number threshold, starting battery group equalization.
5. A method according to any one of claims 1-3, wherein said determining a target battery range group from said plurality of battery range groups based on the number of cells to be equalized in each of said battery range groups comprises:
acquiring voltage data of each battery to be balanced in the battery pack to be balanced;
classifying each voltage data according to the voltage range value of each battery range group to obtain a plurality of battery range groups containing the voltage data;
and comparing the number of the voltage data in each battery range group, and taking the battery range group with the largest number of the voltage data as the target battery range group.
6. A method according to any one of claims 1-3, wherein said capacity balancing the cells to be balanced in said target battery range group comprises:
determining a target voltage value from a plurality of voltage data in the target battery range group;
for each voltage data, charging the battery to be balanced, wherein the voltage data is lower than the target voltage value, until the difference between the voltage data of the battery to be balanced after charging and the target voltage value is within a preset voltage threshold range;
discharging the battery to be balanced, wherein the voltage data is higher than the target voltage value, until the difference between the voltage data of the discharged battery to be balanced and the target voltage value is within the preset voltage threshold range.
7. The method of claim 6, wherein said determining a target voltage value from a plurality of voltage data in said target battery range group comprises:
and carrying out averaging processing on a plurality of voltage data in the target battery range group to obtain an average voltage value, and taking the average voltage value as the target voltage value.
8. A method according to any one of claims 1-3, wherein said capacity balancing the cells to be balanced in said target battery range group comprises:
determining a preset number of target batteries to be balanced from the batteries to be balanced in the target battery range group;
and carrying out capacity equalization on the plurality of target batteries to be equalized.
9. A method according to any one of claims 1-3, wherein the method further comprises:
dividing the battery to be balanced which is not subjected to capacity equalization in other battery range groups and the target battery range group again to generate a plurality of new battery range groups; the other battery range group is a battery range group other than the target battery range group among the plurality of battery range groups;
determining a new target battery range group from the new multiple battery range groups according to the number of batteries to be balanced in each new battery range group;
and carrying out capacity equalization on the batteries to be equalized in the new target battery range group, and repeatedly executing the battery group equalization method until the number of the new multiple battery range groups is smaller than or equal to a preset number threshold value, and closing battery group equalization.
10. A battery equalization apparatus, said apparatus comprising:
the generation module is used for dividing the battery packs to be balanced to generate a plurality of battery range packs; each battery range group comprises a plurality of batteries to be balanced;
a determining module, configured to determine a target battery range group from the plurality of battery range groups according to the number of batteries to be equalized in each of the battery range groups;
and the balancing module is used for carrying out capacity balancing on the batteries to be balanced in the target battery range group.
CN202310993809.8A 2023-08-08 2023-08-08 Battery pack equalization method and device Pending CN117013110A (en)

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