CN118659054A

CN118659054A - Capacity balancing method of battery system, electronic device and storage medium

Info

Publication number: CN118659054A
Application number: CN202410933666.6A
Authority: CN
Inventors: 阮伟杰; 王安国; 吴鑫武
Original assignee: Zhuhai Kechuang Energy Storage Technology Co ltd
Current assignee: Zhuhai Kechuang Energy Storage Technology Co ltd
Priority date: 2024-07-11
Filing date: 2024-07-11
Publication date: 2024-09-17

Abstract

The present invention discloses a capacity balancing method, electronic device and storage medium for a battery system. The method includes: in response to receiving a charge and discharge instruction of the battery system, obtaining a first estimated capacity and a current chargeable and dischargeable capacity of a plurality of single cells in the battery system, wherein the first estimated capacity is determined according to a preset coefficient and a standard capacity, and the standard capacity is the capacity marked when the plurality of single cells leave the factory; determining a first calibrated capacity according to the sum of the first estimated capacity and a target preset value; determining an average chargeable and dischargeable capacity of a plurality of single cells according to the charge and discharge instruction, the current chargeable and dischargeable capacity and the first calibrated capacity; balancing the charge and discharge capacity of a plurality of single cells based on the average chargeable and dischargeable capacity, and obtaining a balancing result, wherein the balancing result is used to indicate that the plurality of single cells have completed the charge and discharge operation corresponding to the charge and discharge instruction. The present invention solves the technical problem of poor battery charge and discharge effect.

Description

Capacity balancing method for battery system, electronic device and storage medium

Technical Field

The present invention relates to the field of batteries, and in particular, to a capacity balancing method for a battery system, an electronic device, and a storage medium.

Background

The battery capacity may gradually decrease as the battery ages, and the power consumption rate of the battery with different aging degrees may also be different during the application, so that the chargeable capacities of the plurality of unit batteries in the same battery system may be different.

When a plurality of unit cells having different chargeable capacities are charged in series at the same time, since the chargeable capacities of the respective cells are the same each time, but the chargeable capacities of the cells are different, there may be cases where some unit cells have been fully charged, but some unit cells still have the remaining chargeable capacities. Similarly, there are cases where partial batteries are insufficiently discharged due to the difference in the dischargeable capacity of each unit battery during discharge. Therefore, the technical problems of low utilization rate of battery capacity and poor charge and discharge effects are caused.

In view of the above problems, no effective solution has been proposed at present.

Disclosure of Invention

The embodiment of the invention provides a capacity balancing method of a battery system, electronic equipment and a storage medium, which are used for at least solving the technical problem of poor battery charging and discharging effects.

According to an aspect of an embodiment of the present invention, there is provided a capacity equalization method of a battery system, including: in response to receiving a charge-discharge instruction of a battery system, acquiring first estimated capacity and current chargeable and dischargeable capacity of a plurality of single batteries in the battery system, wherein the first estimated capacity is determined according to a preset coefficient and standard capacity, and the standard capacity is marked capacity of the plurality of single batteries when leaving the factory; determining a first calibration capacity according to the sum of the first estimated capacity and a target preset value; determining the average chargeable and dischargeable capacity of the plurality of single batteries according to the charge and discharge instruction, the current chargeable and dischargeable capacity and the first calibration capacity; and carrying out charge-discharge capacity equalization on the plurality of single batteries based on the average chargeable-dischargeable capacity to obtain an equalization result, wherein the equalization result is used for indicating that the plurality of single batteries execute charge-discharge operations corresponding to the charge-discharge instructions.

Optionally, the balancing of the charge and discharge capacities of the plurality of single batteries based on the average chargeable and dischargeable capacity to obtain a balancing result includes: sequencing the current chargeable and dischargeable capacities of the plurality of single batteries, and determining a first single battery and a second single battery, wherein the first single battery is the single battery with the largest chargeable and dischargeable capacity in the plurality of single batteries, and the second single battery is the single battery with the smallest chargeable and dischargeable capacity in the plurality of single batteries; determining a first chargeable and dischargeable capacity of the first single cell and a second chargeable and dischargeable capacity of the second single cell based on the current chargeable and dischargeable capacity; determining an equilibrium capacity based on the first chargeable and dischargeable capacity, the second chargeable and dischargeable capacity, and the average chargeable and dischargeable capacity; and performing charge and discharge operations on the plurality of single batteries based on the first chargeable and dischargeable capacity, the second chargeable and dischargeable capacity and the average chargeable and dischargeable capacity so as to realize charge and discharge balance and obtain a balance result.

Optionally, determining the equilibrium capacity based on the first chargeable and dischargeable capacity, the second chargeable and dischargeable capacity, and the average chargeable and dischargeable capacity includes: determining a first difference between the first chargeable and dischargeable capacity and the average chargeable and dischargeable capacity; determining a second difference between the second chargeable and dischargeable capacity and the average chargeable and dischargeable capacity; an equalization capacity is determined based on the first difference and the second difference.

Optionally, performing charge-discharge operations on the plurality of unit cells based on the first chargeable-dischargeable capacity, the second chargeable-dischargeable capacity, and the average chargeable-dischargeable capacity to achieve charge-discharge capacity equalization, including: in response to the charge-discharge instruction being a charge instruction, determining a first chargeable-discharge capacity as a first chargeable capacity and determining a second chargeable-discharge capacity as a second chargeable capacity, wherein the first chargeable capacity is a chargeable capacity of the first single cell and the second chargeable capacity is a chargeable capacity of the second single cell; and performing charging operation on the first single battery based on the first chargeable capacity, and performing discharging operation on the second single battery based on the second chargeable capacity so as to realize charge-discharge capacity equalization and obtain an equalization result.

Optionally, performing charge-discharge operations on the plurality of unit cells based on the first chargeable-dischargeable capacity, the second chargeable-dischargeable capacity, and the average chargeable-dischargeable capacity to achieve charge-discharge capacity equalization, including: in response to the charge-discharge instruction being a discharge instruction, determining that the first chargeable-discharge capacity is a first chargeable-discharge capacity, and determining that the second chargeable-discharge capacity is a second chargeable-discharge capacity, wherein the first chargeable-discharge capacity is a chargeable-discharge capacity of the first single battery, and the second chargeable-discharge capacity is a chargeable-discharge capacity of the second single battery; and performing a discharging operation on the first single battery based on the first dischargeable capacity, and performing a charging operation on the second single battery based on the second dischargeable capacity, so as to realize charge-discharge capacity equalization and obtain an equalization result.

Optionally, before obtaining the first estimated capacity and the current chargeable and dischargeable capacity of the plurality of unit batteries in the battery system, the method further comprises: acquiring current battery state parameters and standard battery state parameters of a plurality of single batteries in the charge and discharge processes of the battery system; determining a preset coefficient based on the current battery state parameter and the standard battery state parameter, wherein the standard battery state parameter is used for representing the battery state parameter of a plurality of preset single batteries in the charging and discharging process; the first estimated capacity is determined based on a product of a preset coefficient and a standard capacity.

Optionally, determining the average chargeable and dischargeable capacity of the plurality of single cells according to the charge and discharge instruction, the current chargeable and dischargeable capacity and the first calibration capacity includes: determining a current chargeable and dischargeable capacity of the current chargeable and dischargeable capacities; determining a current chargeable capacity of the plurality of single cells based on a difference between the first calibrated capacity and the current chargeable capacity; responding to the charge-discharge instruction as a charge instruction, and determining the average chargeable-dischargeable capacity of the plurality of single batteries according to the current chargeable capacity; and determining the average chargeable and dischargeable capacity of the plurality of single batteries based on the current dischargeable capacity in response to the charge and discharge command being a discharge command.

Optionally, the method further comprises: and determining a second estimated capacity based on the sum of the equalization capacity and the first calibration capacity, and taking the second estimated capacity as the first estimated capacity.

According to another aspect of the embodiment of the present invention, there is also provided a capacity equalization apparatus of a battery system, including: the device comprises an acquisition module, a storage module and a storage module, wherein the acquisition module is used for acquiring first estimated capacity and current chargeable and dischargeable capacity of a plurality of single batteries in a battery system in response to receiving a charge and discharge instruction of the battery system, wherein the first estimated capacity is determined according to a preset coefficient and standard capacity, and the standard capacity is marked capacity when the plurality of single batteries leave the factory; the first determining module is used for determining a first calibration capacity according to the sum of the first estimated capacity and a target preset value; the second determining module is used for determining the average chargeable and dischargeable capacity of the plurality of single batteries according to the charge and discharge instruction, the current chargeable and dischargeable capacity and the first calibration capacity; and the balancing module is used for balancing the charge and discharge capacity of the plurality of single batteries based on the average charge and discharge capacity to obtain a balancing result, wherein the balancing result is used for indicating that the plurality of single batteries execute the charge and discharge operation corresponding to the charge and discharge instruction.

According to another aspect of the embodiment of the present invention, there is also provided an electronic device, including: a memory storing an executable program; and the processor is used for running a program, wherein the capacity balancing method of the battery system is executed when the program runs.

According to another aspect of the embodiment of the present invention, there is also provided a computer readable storage medium, including a stored executable program, where a device on which the executable program is controlled to run executes the capacity balancing method of the battery system described above.

According to another aspect of the embodiments of the present invention, there is also provided a computer program product comprising a computer program which, when executed by a processor, implements the above-described method of capacity balancing of a battery system.

In the embodiment of the invention, a first estimated capacity and a current chargeable and dischargeable capacity of a plurality of single batteries in a battery system are obtained in response to receiving a charge and discharge instruction of the battery system, wherein the first estimated capacity is determined according to a preset coefficient and a standard capacity, and the standard capacity is marked capacity of the plurality of single batteries when leaving the factory; determining a first calibration capacity according to the sum of the first estimated capacity and a target preset value; determining the average chargeable and dischargeable capacity of the plurality of single batteries according to the charge and discharge instruction, the current chargeable and dischargeable capacity and the first calibration capacity; and carrying out charge-discharge capacity equalization on the plurality of single batteries based on the average chargeable-dischargeable capacity to obtain an equalization result, wherein the equalization result is used for indicating that the plurality of single batteries execute charge-discharge operations corresponding to the charge-discharge instructions. It is easy to note that when the charge and discharge operations are performed on the plurality of single batteries with different chargeable capacities or dischargeable capacities, the average chargeable and dischargeable capacity of the plurality of single batteries, that is, the average value of the chargeable and dischargeable capacities of the plurality of batteries, can be determined according to the charge and discharge instruction, the current chargeable and dischargeable capacity and the first calibration capacity, then the charge and discharge capacities of the plurality of single batteries are balanced based on the average chargeable and dischargeable capacity, the existing electric quantity of the plurality of single batteries is balanced, the actual chargeable and dischargeable capacities of the plurality of single batteries are equal to the average chargeable and dischargeable capacities, and then the charge and discharge operations are performed, so that the plurality of single batteries with different chargeable and dischargeable capacities can be fully charged or fully discharged, the purpose of fully utilizing the battery capacity is achieved, the improvement of the charge and discharge effects is achieved, and the technical problem that the battery charge and discharge effects are poor is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

Fig. 1 is a schematic diagram of a capacity balancing method of a battery system according to an embodiment of the present invention;

FIG. 2 is a flow chart of an alternative determination of a first estimated capacity of an individual cell in accordance with an embodiment of the present invention;

fig. 3 is a flowchart of an alternative charge balancing of a battery cell during charging according to an embodiment of the present invention;

FIG. 4 is a flow chart of an alternative discharge equalization of a cell during discharge according to an embodiment of the present invention;

fig. 5 is a schematic view of a capacity equalizing apparatus of a battery system according to an embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Example 1

According to an embodiment of the present invention, there is provided an embodiment of a capacity balancing method of a battery system, it being noted that the steps shown in the flowcharts of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that herein.

Fig. 1 is a schematic view of a capacity balancing method of a battery system according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:

Step S102, a first estimated capacity and a current chargeable and dischargeable capacity of a plurality of single batteries in the battery system are obtained in response to receiving a charge and discharge instruction of the battery system, wherein the first estimated capacity is determined according to a preset coefficient and a standard capacity, and the standard capacity is marked when the plurality of single batteries leave the factory.

The charge and discharge instruction in the above steps is a charge and discharge instruction for a plurality of unit batteries in the battery system, and is used for indicating the plurality of unit batteries in the battery system to charge and discharge, and the charge and discharge instruction can be sent to the battery system by a user through an interaction device, and the interaction device can be a button or an interaction system installed on a computer, but is not limited thereto.

The preset coefficients in the above steps are preset and can be used to determine the coefficients of the first estimated capacity. The aging degree of the single battery from delivery to date can be estimated according to delivery time and industry experience of the single battery, the preset coefficient is set, the preset coefficient can be determined through experiments on the single battery, and the determination mode of the preset coefficient is not limited to the above.

The first estimated capacity in the above step is an actual capacity of the unit cell, and may be equal to the standard capacity when the unit cell leaves the factory, but the unit cell may be aged with use, and the first estimated capacity may be gradually decreased, which is lower than the standard capacity.

The current chargeable and dischargeable capacity in the above step is the chargeable and dischargeable capacity of the current unit cell. The chargeable and dischargeable capacity includes a chargeable and dischargeable capacity, the dischargeable capacity being an amount of electricity existing in the current cell, the chargeable capacity being a maximum value of an amount of charge acceptable to the current cell, a sum of the chargeable and dischargeable capacity being a first estimated capacity.

In an alternative embodiment, after receiving the charge and discharge instruction of the battery system, the standard capacity of the battery cell may be determined according to the instruction of the battery cell. Fig. 2 is a flowchart of an alternative determination of a first estimated capacity of an individual battery according to an embodiment of the present invention, as shown in fig. 2:

Step S202, open circuit voltage measurement is enabled.

When the single battery is powered on for the first time, the capacity information of the single battery is measured through an open circuit voltage (Open Ci rcu it Vo ltage, abbreviated as OCV). OCV measurement is also known as static voltage test, i.e. voltage measurement of a single cell in the circuit to which no load is connected. The OCV measurement is a measurement performed when the memory has no current capacity information of the battery cell when the battery is powered on for the first time, and decides whether to update the standard capacity according to the measurement result, if the difference between the measurement result and the standard capacity given in the manufacturer specification is too large, for example, the difference exceeds 2%, the standard capacity is updated to the measurement result, otherwise, the standard capacity is not updated. It should be noted that the above values are only examples, and in practice, other values may be selected according to actual application conditions to measure whether the measurement result is too large from the standard capacity given in the manufacturer specification.

When the single battery is not charged or discharged for a long time, OCV measurement can be performed once, the measurement result is compared with the first estimated capacity of the current single battery, and the first estimated capacity is updated under the condition of large difference. For example, when the difference exceeds 2%, the difference is considered to be large, but the value is merely an example, and other values may be actually selected according to actual application conditions.

The OCV measurement is only needed to be carried out when the battery is electrified for the first time or the battery cell is not charged and discharged for a long time, the battery cell is not needed to be carried out for a plurality of times, and after the charge-discharge capacity balancing operation is carried out, the first estimated capacity can be automatically updated according to the balancing capacity, so that the technical problem that the use environment cannot meet the requirement of the OCV measurement for a plurality of times can be solved.

Step S204, the charge and discharge are completed.

In the OCV measurement process, the battery cell is charged and discharged.

Step S206, obtaining the limit performance battery data.

In the OCV measurement process, limit performance battery data is acquired upon completion of the charge and discharge operations of the unit battery, and may include, but is not limited to, battery internal resistance, temperature, voltage, current, and the like.

Step S208, estimating the battery capacity.

The battery capacity is a first estimated capacity of the single battery, voltage in the limit performance battery data obtained by OCV measurement is taken as main judgment data, internal resistance of the battery is taken as auxiliary judgment data, the battery capacity of the single battery is estimated, and the reliability degree of the battery capacity is estimated by using temperature information.

The current chargeable and dischargeable capacity includes a current chargeable capacity and a current dischargeable capacity. When the current chargeable and dischargeable capacity is obtained, the current dischargeable capacity of the single battery can be determined according to the voltage, the current and the internal resistance of the battery, which are obtained through experimental measurement, and the calculation formula is as follows:

C＝U*I/R；

Wherein, C is the current dischargeable capacity of the single battery, U is voltage, I is current, and R is internal resistance of the battery.

After determining the first estimated capacity, the current chargeable capacity may be obtained by subtracting the chargeable capacity from the first estimated capacity.

Step S104, determining a first calibration capacity according to the sum of the first estimated capacity and the target preset value.

The target preset value in the step is preset and is used for carrying out summation calculation with the first estimated capacity to determine the value of the first calibrated capacity. The target preset value may be preset according to actual application conditions, or may be preset according to industry experience, but the manner of setting the target preset value is not limited thereto.

In an alternative embodiment, the sum of the first estimated capacity and the target preset value is calculated, the sum of the first estimated capacity and the target preset value is used as the first calibration capacity, so that the first calibration capacity is slightly higher than the first estimated capacity, and the first calibration capacity is used for balancing the charge and discharge capacities, so that the plurality of single batteries can be fully charged or fully discharged.

Step S106, determining the average chargeable and dischargeable capacity of the plurality of single batteries according to the charge and discharge instruction, the current chargeable and dischargeable capacity and the first calibration capacity.

The average chargeable and dischargeable capacity in the above step includes an average chargeable capacity and an average dischargeable capacity, the average chargeable capacity being an average of remaining chargeable capacities of the plurality of unit batteries after the plurality of unit batteries are charged; the average dischargeable capacity is an average value of the remaining dischargeable capacities of the plurality of unit cells after the plurality of unit cells are discharged.

In an alternative embodiment, the current chargeable capacity may be determined based on a difference between the first calibrated capacity and the current dischargeable capacity. The purpose of determining the current chargeable capacity using the first calibration capacity instead of the first estimated capacity is to make the current chargeable capacity participating in the equalization calculation slightly larger than the actual value, preventing the problem of insufficient charge or discharge of the unit cell.

When the plurality of single batteries are charged, the plurality of single batteries in the battery system are charged in series according to the charging instruction, and the charging amounts obtained by the plurality of single batteries are the same. The current chargeable capacity of the plurality of single batteries is used to subtract the charged amount to obtain the remaining chargeable capacity of the plurality of single batteries. And calculating the average value of the residual chargeable capacities of all the single batteries in the battery system, so that the average chargeable capacities of a plurality of single batteries can be obtained.

When the plurality of single batteries are discharged, the plurality of single batteries in the battery system are discharged in series according to the discharging instruction, and the electric quantity discharged by the plurality of single batteries is the same. And subtracting the discharge capacity from the current dischargeable capacity of the plurality of single batteries to obtain the residual dischargeable capacity of the plurality of single batteries. And calculating the average value of the residual dischargeable capacities of all the single batteries in the battery system, and obtaining the average dischargeable capacity of the plurality of single batteries.

In another alternative embodiment, the current chargeable capacity may be determined based on a difference between the first calibrated capacity and the current dischargeable capacity. When a plurality of single batteries are charged, after a charging instruction is received, the average value of the chargeable capacity of all the single batteries in the battery system can be calculated to obtain the average chargeable capacity of the plurality of single batteries; after receiving the charging instruction, the average value of the chargeable capacities of the single battery with the largest chargeable capacity and the single battery with the smallest chargeable capacity in the battery system can be calculated to obtain the average chargeable capacity of the plurality of single batteries.

When the plurality of single batteries are discharged, after a discharge instruction is received, calculating the average value of the dischargeable capacity of all the single batteries in the battery system to obtain the average dischargeable capacity of the plurality of single batteries; after receiving the discharging instruction, the average value of the dischargeable capacity of the single battery with the largest dischargeable capacity and the single battery with the smallest dischargeable capacity in the battery system can be calculated, and the average dischargeable capacity of the plurality of single batteries can be obtained.

The method of determining the average chargeable and dischargeable capacity of the plurality of unit cells may not be limited thereto.

And step S108, carrying out charge-discharge capacity equalization on the plurality of single batteries based on the average charge-discharge capacity to obtain an equalization result, wherein the equalization result is used for indicating that the plurality of single batteries execute charge-discharge operations corresponding to the charge-discharge instructions.

In an alternative embodiment, when the average chargeable and dischargeable capacity is the average chargeable and dischargeable capacity of all the single batteries in the battery system, after the plurality of single batteries are charged in the charge capacity balancing process, the remaining chargeable capacities of the plurality of single batteries can all reach the average chargeable capacity through charge capacity balancing, and when the remaining chargeable capacities of the plurality of single batteries all reach the average chargeable capacity, the sufficient charging of the plurality of single batteries can be realized through serial charging.

In the process of performing the charge capacity equalization, a difference between the current chargeable capacity and the average charge capacity of each unit cell may be calculated. When the current chargeable capacity of the single battery is larger than the average chargeable capacity, the single battery needs to be continuously charged to reach the average chargeable capacity, and the charging amount of the single battery needing to be continuously charged is determined at the moment; when the current chargeable capacity of the single battery is smaller than the average chargeable capacity, the single battery needs to be discharged to reach the average chargeable capacity, and the discharge amount of the single battery which needs to be continuously discharged is determined.

According to the charge amount required to be charged and the discharge amount required to be discharged of each battery, a controller in a battery system is used for controlling the plurality of single batteries to charge and discharge, so that the residual chargeable capacity of the plurality of single batteries reaches the average chargeable capacity. And based on the average chargeable capacity, carrying out serial charging on the plurality of single batteries to obtain an equalization result.

The above embodiments are described by taking charge capacity equalization as an example, and the process and type of discharge equalization are not described herein.

In another alternative embodiment, when the average chargeable and dischargeable capacity is the average chargeable and dischargeable capacity of all the unit batteries in the battery system, in the process of balancing the chargeable and dischargeable capacities, the chargeable and dischargeable capacities of all the unit batteries in the battery system may be adjusted, that is, the charge balancing is performed, and then the charging is performed.

The plurality of single cells are controlled to charge and discharge using a controller in the battery system such that the remaining chargeable capacity of the plurality of single cells reaches an average chargeable capacity. And then, carrying out serial charging on the single batteries in the battery system, wherein all the single batteries in the battery system can be charged fully at the same time, so as to obtain an equalization result.

In yet another alternative embodiment, when the average chargeable and dischargeable capacity is the average value of the chargeable and dischargeable capacity of the cell with the largest chargeable and dischargeable capacity and the cell with the smallest chargeable and dischargeable capacity in the battery system, in the charge capacity balancing process, the controller in the battery system may be used to control the cell with the largest chargeable capacity to charge so that the chargeable capacity reaches the average chargeable capacity, and control the cell with the smallest chargeable capacity to discharge so that the chargeable capacity reaches the average chargeable capacity.

Then, in the process of charging a plurality of single batteries in the battery system, only the single battery with the largest chargeable and dischargeable capacity and the single battery with the smallest chargeable and dischargeable capacity are balanced in the previous balancing process, and other single batteries are not balanced. Therefore, after the charge is performed, the average chargeable/dischargeable capacity of the plurality of unit cells is determined again, and the unit cell having the largest chargeable/dischargeable capacity and the unit cell having the smallest chargeable/dischargeable capacity is selected from the unit cells, and is equalized again. And (5) the balancing process is circulated until all the single batteries are fully charged, and a balancing result is obtained.

Optionally, sorting the current chargeable and dischargeable capacities of the plurality of single batteries, and determining a first single battery and a second single battery, wherein the first single battery is the single battery with the largest chargeable and dischargeable capacity in the plurality of single batteries, and the second single battery is the single battery with the smallest chargeable and dischargeable capacity in the plurality of single batteries; determining a first chargeable and dischargeable capacity of the first single cell and a second chargeable and dischargeable capacity of the second single cell based on the current chargeable and dischargeable capacity; determining an equilibrium capacity based on the first chargeable and dischargeable capacity, the second chargeable and dischargeable capacity, and the average chargeable and dischargeable capacity; and performing charge and discharge operations on the plurality of single batteries based on the first chargeable and dischargeable capacity, the second chargeable and dischargeable capacity and the average chargeable and dischargeable capacity so as to realize charge and discharge balance and obtain a balance result.

The first chargeable and dischargeable capacity in the above step is the chargeable and dischargeable capacity of the first single battery after being charged; the second chargeable and dischargeable capacity is the chargeable and dischargeable capacity of the second single battery after the charging.

The equalized capacity in the above step is a capacity obtained by equalizing the charge-discharge capacities of the plurality of unit cells based on the average charge-discharge capacity, and may represent a difference between the current chargeable-discharge capacity and the average charge-discharge capacity of the plurality of unit cells.

In an alternative embodiment, fig. 3 is a flowchart of an alternative charge balancing of a battery cell during charging according to an embodiment of the present invention, as shown in fig. 3:

in step S302, the chargeable capacities of all the unit batteries are extracted.

After the plurality of single batteries are charged once, determining the current chargeable and dischargeable capacities of the plurality of single batteries according to the charged amounts, and sequencing the current chargeable and dischargeable capacities of the plurality of single batteries. The battery with the largest current chargeable capacity is determined to be a first single battery, the charge amount of the first single battery is taken as a first chargeable and dischargeable capacity, the battery with the smallest current chargeable capacity is taken as a second single battery, and the charge amount of the second single battery is taken as a second chargeable and dischargeable capacity.

Step S304, a capacity difference between the chargeable capacity of the unit battery and the average chargeable capacity is calculated.

The difference between the first chargeable and dischargeable capacity and the average chargeable capacity is calculated, and since the first chargeable and dischargeable capacity is the current chargeable capacity maximum, the difference in capacity is a positive value greater than the average chargeable capacity.

The difference between the second chargeable and dischargeable capacity and the average chargeable capacity is calculated, and since the second chargeable and dischargeable capacity is the smallest current chargeable capacity, it is smaller than the average chargeable capacity, and the capacity difference is a negative value.

The difference in capacity is also referred to as the equalization capacity.

And step S306, balancing the charging capacity of the single batteries according to the sequence from the large capacity difference to the small capacity difference.

And (3) carrying out priority equalization on the single batteries with large capacity difference according to the sequence of the capacity difference, namely the equalization capacity from large to small. When the charge capacity is equalized, a controller in the battery system is used to charge the first unit cell having a positive capacity difference, and the charge amount is a value corresponding to the capacity difference. And performing discharging operation on the second single battery with the capacity difference of a negative value by using a controller in the battery system, wherein the discharging quantity is a value corresponding to the capacity difference. The equalization stop condition may be that the difference between the current chargeable capacity and the average chargeable capacity of the unit cell is less than 0.02AH (ampere hours, i.e., the cumulative amount of current that the cell can supply in one hour). It should be noted that 0.02AH is only an example, and other suitable values may be selected according to the specific situation in practical application.

Step S308, updating the chargeable capacity of the single battery.

And after the charge capacity equalization is completed, an equalization result is obtained, and the chargeable capacity of the single battery is updated.

Fig. 4 is a flowchart of an alternative discharging equalization of a single cell during discharging according to an embodiment of the present invention, as shown in fig. 4:

step S402, extracting the dischargeable capacity of all the single batteries;

Step S404, calculating the capacity difference between the dischargeable capacity and the average dischargeable capacity of the single battery;

Step S406, balancing the discharge capacity of the single batteries according to the sequence from the large capacity difference to the small capacity difference;

in step S408, the dischargeable capacity of the unit cell is updated.

The specific implementation process is similar to the charge equalization process, and will not be described here again.

The first difference in the above steps is a difference between the first chargeable and dischargeable capacity and the average chargeable and dischargeable capacity, and the second difference is a difference between the second chargeable and dischargeable capacity and the average chargeable and dischargeable capacity.

In an alternative embodiment, the first difference is obtained using the first chargeable and dischargeable capacity and subtracting the average chargeable and dischargeable capacity, and the second difference is obtained using the second chargeable and dischargeable capacity and subtracting the average chargeable and dischargeable capacity.

In the charging process, the first chargeable and dischargeable capacity corresponds to the first single battery with the largest current chargeable and dischargeable capacity, so that the first chargeable and dischargeable capacity is larger than the average chargeable and dischargeable capacity, and the first difference value is a positive value. And taking the first difference value as the balance capacity of the first single battery, wherein in the balance process, the first single battery needs to be charged to reach the average chargeable and dischargeable capacity, and the charge quantity needed to be charged is the absolute value of the balance capacity.

In the charging process, the second chargeable and dischargeable capacity corresponds to the second single battery with the smallest current chargeable and dischargeable capacity, so that the second chargeable and dischargeable capacity is smaller than the average chargeable and dischargeable capacity, and the second difference value is a negative value. And taking the second difference value as the balance capacity of the second single battery, wherein in the balance process, the first single battery needs to be discharged to reach the average chargeable and dischargeable capacity, and the discharge capacity needed to be discharged is the absolute value of the balance capacity.

In another alternative embodiment, the first difference is obtained using the first chargeable and dischargeable capacity and subtracting the average chargeable and dischargeable capacity, and the second difference is obtained using the second chargeable and dischargeable capacity and subtracting the average chargeable and dischargeable capacity.

In the discharging process, the first chargeable and dischargeable capacity corresponds to the first single battery with the largest current chargeable and dischargeable capacity, so that the first chargeable and dischargeable capacity is larger than the average chargeable and dischargeable capacity, and the first difference value is a positive value. And taking the first difference value as the balance capacity of the first single battery, wherein in the balance process, the first single battery needs to be discharged to reach the average chargeable and dischargeable capacity, and the discharge capacity needed to be discharged is the absolute value of the balance capacity.

In the discharging process, the second chargeable and dischargeable capacity corresponds to the second single battery with the smallest current chargeable and dischargeable capacity, so that the second chargeable and dischargeable capacity is smaller than the average chargeable and dischargeable capacity, and the second difference value is a negative value. And taking the second difference value as the balance capacity of the second single battery, wherein in the balance process, the first single battery needs to be charged to reach the average chargeable and dischargeable capacity, and the charge quantity needed to be charged is the absolute value of the balance capacity.

The charging instruction in the above steps is one of charging and discharging instructions, which is issued by a user and instructs to charge a plurality of unit batteries in the battery system.

In an alternative embodiment, when the charge and discharge command is a charge command, the controller in the circuitry performs an adjustment operation on the electric quantities in the plurality of unit cells according to the size and the positive and negative of the equalization capacity.

The equalization capacity corresponding to the first single battery is a positive value, the controller controls the first single battery to charge, and the charged electric quantity is the equalization capacity of the first single battery, so that the chargeable capacity of the first single battery is close to the average chargeable capacity. The equilibrium capacity corresponding to the second single battery is a negative value, the controller controls the first single battery to discharge, and the discharged electric quantity is the magnitude of the equilibrium capacity of the second single battery, so that the chargeable capacity of the second single battery is close to the average chargeable capacity. And after the charge and discharge are controlled, obtaining an equalization result.

The discharge instruction in the above steps is also one of charge and discharge instructions, and is an instruction issued by a user to discharge a plurality of unit batteries in the battery system.

In an alternative embodiment, when the charge-discharge command is a discharge command, the controller in the circuitry performs an adjustment operation on the electric quantities in the plurality of unit cells according to the magnitude and the forward and reverse of the equalization capacity.

The equilibrium capacity corresponding to the first single battery is a positive value, the controller controls the first single battery to discharge, and the discharged electric quantity is the magnitude of the equilibrium capacity of the first single battery, so that the dischargeable capacity of the first single battery is close to the average dischargeable capacity. The equilibrium capacity corresponding to the second single battery is a negative value, the controller controls the first single battery to charge, and the charged electric quantity is the magnitude of the equilibrium capacity of the second single battery, so that the dischargeable capacity of the second single battery is close to the average dischargeable capacity. And after the charge and discharge are controlled, obtaining an equalization result.

The current battery state parameter in the above step is a parameter that can describe the current state of the unit battery, and can be used to determine a preset coefficient.

The standard battery state parameter in the above step may represent a preset standard battery state parameter of the plurality of unit batteries in the charge and discharge process, and a parameter of a battery factory state may be used as the standard battery state parameter. Standard battery state parameters may be used to determine the preset coefficients.

The preset coefficient in the above step can quantify the difference between the current battery state parameter and the standard battery state parameter, and is used for correcting the standard capacity to obtain the first estimated capacity.

In an alternative embodiment, the state parameter of the factory state of the single battery is taken as a standard state parameter, and the standard state parameter includes, but is not limited to, standard working voltage, internal resistance and the like of the single battery when the single battery is factory, and the standard state parameter can be obtained in the specification of the single battery, but the method for obtaining the voltage and the current of the single battery is not limited to the standard state parameter.

In determining the current Battery state parameters, a Battery Management System (BMS) may be used to obtain the current Battery state parameters of the plurality of Battery cells, where the current Battery state parameters may include, but are not limited to, voltage, internal resistance, temperature, etc. of the Battery cells when the Battery cells are operated.

The difference between the current battery state parameter and the standard battery state parameter is compared, a preset coefficient can be determined according to experience, and the ratio between the voltage of the body battery in the current battery state parameter and the standard working voltage of the single battery in the standard battery state parameter when leaving the factory can be calculated in a data analysis mode, so that the preset coefficient is obtained. The product of the preset coefficient and the standard capacity is then calculated to determine a first estimated capacity.

The current dischargeable capacity in the above step is the amount of electricity existing in the current unit cell, which can be used for discharging. When the charge-discharge instruction is a discharge instruction, that is, in the process of discharging the plurality of unit cells in the battery system, the average chargeable-dischargeable capacity refers to an average dischargeable capacity, and the average dischargeable capacity can be determined using the current dischargeable capacities of the plurality of cells.

The current chargeable capacity in the above step is the maximum value of the receivable charge amount in the current unit cell. When the charge/discharge command is a charge command, that is, in the process of charging the plurality of unit batteries in the battery system, the average chargeable/dischargeable capacity refers to an average chargeable capacity, and the average chargeable capacity can be determined using the current chargeable capacities of the plurality of batteries.

In an alternative embodiment, the cell may be tested using a battery test instrument to obtain the current dischargeable capacity of the cell. And then calculating the difference value between the first calibration capacity and the current dischargeable capacity to obtain the current chargeable capacity of the single battery.

When the charge and discharge instruction is a charge instruction, average calculation is carried out on the current chargeable capacity of a plurality of single batteries in the battery system, and average chargeable and dischargeable capacity is obtained. When the charge-discharge instruction is a discharge instruction, calculating the average value of the current dischargeable capacities of the plurality of single batteries in the battery system to obtain the average dischargeable capacity.

The second estimated capacity in the above step is the sum of the equalization capacity and the first calibration capacity, and can be used as the first estimated capacity of the next round of equalization method.

In an alternative embodiment, in the process of calculating the average chargeable and dischargeable capacity, the average of the chargeable and dischargeable capacities of all the unit batteries in the battery system may be calculated, or the chargeable and dischargeable capacity average of only the unit battery with the largest chargeable and dischargeable capacity and the unit battery with the smallest chargeable and dischargeable capacity may be calculated.

The advantage of calculating the charge-discharge capacity average value of only the single battery with the largest charge-discharge capacity and the single battery with the smallest charge-discharge capacity is that the speed of calculating the average charge-discharge capacity can be improved when the number of single batteries in the battery system is large. However, since the average chargeable/dischargeable capacity is only the average of the chargeable/dischargeable capacities of the two unit cells, only the two unit cells are equalized when the charge/discharge capacities are equalized. And performing a process of iteratively executing calculation of average chargeable and dischargeable capacity and equalization of the chargeable and dischargeable capacity until all the single batteries are equalized.

Therefore, after executing the capacity balancing method of one round, the sum of the balancing capacity and the first calibration capacity can be calculated to obtain a second estimated capacity, and the second estimated capacity is used as the first estimated capacity of the capacity balancing method of the next round, and the calculation is put into the calculation again to continue to execute the capacity balancing process.

Example 2

According to the embodiment of the present invention, an embodiment of a capacity balancing device for a battery system is provided, where the device may perform the capacity balancing method for a battery system provided in the foregoing embodiment 1, and a specific implementation manner and a preferred application scenario are the same as those of the foregoing embodiment 1, and are not described herein.

Fig. 5 is a schematic view of a capacity equalization apparatus of a battery system according to an embodiment of the present invention, as shown in fig. 5:

The obtaining module 50 is configured to obtain, in response to receiving a charge/discharge instruction of the battery system, a first estimated capacity and a current chargeable/dischargeable capacity of a plurality of unit batteries in the battery system, where the first estimated capacity is determined according to a preset coefficient and a standard capacity, and the standard capacity is a capacity marked when the plurality of unit batteries leave the factory.

The first determining module 52 is configured to determine a first calibration capacity according to a sum of the first estimated capacity and a target preset value.

The second determining module 54 is configured to determine an average chargeable and dischargeable capacity of the plurality of unit batteries according to the charge and discharge command, the current chargeable and dischargeable capacity, and the first calibration capacity.

The balancing module 56 is configured to balance charge and discharge capacities of the plurality of unit batteries based on the average chargeable and dischargeable capacity, and obtain a balancing result, where the balancing result is used to indicate that the plurality of unit batteries perform charge and discharge operations corresponding to the charge and discharge instructions.

The equalization module includes: the sequencing unit is used for sequencing the current chargeable and dischargeable capacities of the plurality of single batteries and determining a first single battery and a second single battery, wherein the first single battery is the single battery with the largest chargeable and dischargeable capacity in the plurality of single batteries, and the second single battery is the single battery with the smallest chargeable and dischargeable capacity in the plurality of single batteries; a first determination unit configured to determine a first chargeable and dischargeable capacity of the first unit cell and a second chargeable and dischargeable capacity of the second unit cell based on the current chargeable and dischargeable capacity; a second determination unit configured to determine an equilibrium capacity based on the first chargeable and dischargeable capacity, the second chargeable and dischargeable capacity, and the average chargeable and dischargeable capacity; and the charge-discharge unit is used for carrying out charge-discharge operation on the plurality of single batteries based on the first chargeable-dischargeable capacity, the second chargeable-dischargeable capacity and the average chargeable-dischargeable capacity so as to realize charge-discharge capacity equalization and obtain an equalization result.

The second determining unit is further configured to determine a first difference between the first chargeable and dischargeable capacity and the average chargeable and dischargeable capacity; determining a second difference between the second chargeable and dischargeable capacity and the average chargeable and dischargeable capacity; an equalization capacity is determined based on the first difference and the second difference.

The charging and discharging unit is further configured to determine, in response to the charging and discharging instruction being a charging instruction, a first chargeable and discharging capacity as a first chargeable capacity, and determine a second chargeable and discharging capacity as a second chargeable capacity, where the first chargeable capacity is a chargeable capacity of the first unit cell, and the second chargeable capacity is a chargeable capacity of the second unit cell; and performing charging operation on the first single battery based on the first chargeable capacity, and performing discharging operation on the second single battery based on the second chargeable capacity so as to realize charge-discharge capacity equalization and obtain an equalization result.

The charge-discharge unit is further configured to determine, in response to the charge-discharge instruction being a discharge instruction, that the first chargeable-discharge capacity is a first chargeable-discharge capacity, and determine that the second chargeable-discharge capacity is a second chargeable-discharge capacity, wherein the first chargeable-discharge capacity is a chargeable-discharge capacity of the first unit cell, and the second chargeable-discharge capacity is a chargeable-discharge capacity of the second unit cell; and performing a discharging operation on the first single battery based on the first dischargeable capacity, and performing a charging operation on the second single battery based on the second dischargeable capacity, so as to realize charge-discharge capacity equalization and obtain an equalization result.

The acquisition module further includes: the battery system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring current battery state parameters and standard battery state parameters of a plurality of single batteries in the charge and discharge process of the battery system; a third determining unit, configured to determine a preset coefficient based on a current battery state parameter and a standard battery state parameter, where the standard battery state parameter is used to represent battery state parameters of a plurality of preset single batteries in a charging and discharging process; and a fourth determining unit for determining the first estimated capacity based on a product of the preset coefficient and the standard capacity.

The second determination module includes: a fifth determination unit for determining a current chargeable and dischargeable capacity among the current chargeable and dischargeable capacities; a sixth determination unit for determining a current chargeable capacity of the plurality of unit cells based on a difference between the first calibration capacity and the current chargeable capacity; a seventh determining unit configured to determine an average chargeable and dischargeable capacity of the plurality of unit batteries according to the current chargeable capacity in response to the charge and discharge instruction being a charge instruction; and an eighth determination unit configured to determine an average chargeable and dischargeable capacity of the plurality of unit cells based on the current dischargeable capacity in response to the charge and discharge instruction being a discharge instruction.

The equalization module is further configured to determine a second estimated capacity based on a sum of the equalization capacity and the first calibration capacity, and take the second estimated capacity as the first estimated capacity.

Example 3

According to an embodiment of the present invention, there is also provided an electronic device including: a memory storing an executable program; a processor for running a program, wherein the program executes the capacity balancing method of the battery system in embodiment 1 when running.

Example 4

Embodiments of the present application also provide a computer-readable storage medium including a stored executable program, wherein the executable program when run controls a device in which the computer-readable storage medium is located to perform the method of capacity balancing of the battery system in the various embodiments of the present application.

Example 5

Embodiments of the present application also provide a computer program product comprising a computer program which, when executed by a processor, implements the method of capacity balancing of a battery system in various embodiments of the present application.

Example 6

Embodiments of the present application also provide a computer program product comprising a non-volatile computer readable storage medium for storing a computer program which, when executed by a processor, implements a method for capacity balancing of a battery system in various embodiments of the present application.

The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a Read-only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims

1. A capacity balancing method for a battery system, comprising:

In response to receiving a charge and discharge instruction of the battery system, obtaining a first estimated capacity and a current chargeable and dischargeable capacity of a plurality of single cells in the battery system, wherein the first estimated capacity is determined according to a preset coefficient and a standard capacity, and the standard capacity is the capacity marked on the plurality of single cells when they leave the factory;

Determine a first calibrated capacity according to the sum of the first estimated capacity and a target preset value;

Determine an average chargeable and dischargeable capacity of the plurality of single cells according to the charge and discharge instruction, the current chargeable and dischargeable capacity, and the first rated capacity;

Based on the average chargeable and dischargeable capacity, the charge and discharge capacities of the plurality of single cells are balanced to obtain a balance result, wherein the balance result is used to indicate that the plurality of single cells have completed the charge and discharge operations corresponding to the charge and discharge instructions.

2. The capacity balancing method of the battery system according to claim 1, characterized in that the charging and discharging capacity of the plurality of single cells is balanced based on the average chargeable and dischargeable capacity to obtain a balancing result, comprising:

Sorting the current chargeable and dischargeable capacities of the plurality of single cells to determine a first single cell and a second single cell, wherein the first single cell is a single cell with the largest chargeable and dischargeable capacity among the plurality of single cells, and the second single cell is a single cell with the smallest chargeable and dischargeable capacity among the plurality of single cells;

Determine a first chargeable and dischargeable capacity of the first single cell and a second chargeable and dischargeable capacity of the second single cell based on the current chargeable and dischargeable capacity;

Determine a balancing capacity based on the first chargeable and dischargeable capacity, the second chargeable and dischargeable capacity, and the average chargeable and dischargeable capacity;

Based on the first chargeable and dischargeable capacity, the second chargeable and dischargeable capacity, and the average chargeable and dischargeable capacity, the plurality of single cells are charged and discharged to achieve charge and discharge capacity balance and obtain a balance result.

3. The capacity balancing method of the battery system according to claim 2, characterized in that the balancing capacity is determined based on the first chargeable and dischargeable capacity, the second chargeable and dischargeable capacity, and the average chargeable and dischargeable capacity, comprising:

Determining a first difference between the first chargeable and dischargeable capacity and the average chargeable and dischargeable capacity;

Determining a second difference between the second chargeable and dischargeable capacity and the average chargeable and dischargeable capacity;

The balancing capacity is determined based on the first difference and the second difference.

4. The capacity balancing method of the battery system according to claim 2, characterized in that the plurality of single cells are charged and discharged based on the first chargeable and dischargeable capacity, the second chargeable and dischargeable capacity, and the average chargeable and dischargeable capacity to achieve the charge and discharge capacity balancing and obtain a balancing result, comprising:

In response to the charge and discharge instruction being a charge instruction, determining the first chargeable and dischargeable capacity as a first chargeable capacity, and determining the second chargeable and dischargeable capacity as a second chargeable capacity, wherein the first chargeable capacity is the chargeable capacity of the first single battery, and the second chargeable capacity is the chargeable capacity of the second single battery;

A charging operation is performed on the first single battery based on the first chargeable capacity, and a discharging operation is performed on the second single battery based on the second chargeable capacity, so as to achieve the charge and discharge capacity balance.

5. The capacity balancing method of the battery system according to claim 2, characterized in that the plurality of single cells are charged and discharged based on the first chargeable and dischargeable capacity, the second chargeable and dischargeable capacity, and the average chargeable and dischargeable capacity to achieve the charge and discharge capacity balancing and obtain a balancing result, comprising:

In response to the charge and discharge instruction being a discharge instruction, determining the first chargeable and dischargeable capacity as a first dischargeable capacity, and determining the second chargeable and dischargeable capacity as a second dischargeable capacity, wherein the first dischargeable capacity is the dischargeable capacity of the first single cell, and the second dischargeable capacity is the dischargeable capacity of the second single cell;

A discharge operation is performed on the first single cell based on the first dischargeable capacity, and a charge operation is performed on the second single cell based on the second dischargeable capacity, so as to achieve the charge and discharge capacity balance.

6. The capacity balancing method of a battery system according to claim 1, characterized in that before obtaining the first estimated capacity and the current chargeable and dischargeable capacity of the plurality of single cells in the battery system, the method further comprises:

During the charging and discharging process of the battery system, obtaining current battery state parameters and standard battery state parameters of the plurality of single batteries;

Determining the preset coefficient based on the current battery state parameter and the standard battery state parameter, wherein the standard battery state parameter is used to represent the preset battery state parameter of the plurality of single cells during the charging and discharging process;

The first estimated capacity is determined based on a product of the preset coefficient and the standard capacity.

7. The capacity balancing method of the battery system according to claim 1, characterized in that the average chargeable and dischargeable capacity of the plurality of single batteries is determined according to the charge and discharge instruction, the current chargeable and dischargeable capacity and the first calibrated capacity, comprising:

Determining a current dischargeable capacity of the current chargeable and dischargeable capacity;

Determining the current chargeable capacity of the plurality of single cells based on the difference between the first rated capacity and the current dischargeable capacity;

In response to the charge and discharge instruction being a charge instruction, determining the average chargeable and dischargeable capacity of the plurality of single cells according to the current chargeable capacity;

In response to the charge and discharge instruction being a discharge instruction, the average chargeable and dischargeable capacity of the plurality of single batteries is determined based on the current dischargeable capacity.

8. The capacity balancing method of the battery system according to claim 1, characterized in that the method further comprises:

A second estimated capacity is determined based on the sum of the balancing capacity and the first rated capacity, and the second estimated capacity is used as the first estimated capacity.

9. An electronic device, comprising:

A memory storing an executable program;

A processor, configured to run the program, wherein the program executes the method according to any one of claims 1 to 8 when running.

10. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored executable program, wherein when the executable program is running, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 8.

11. A computer program product, characterized in that it comprises a computer program, wherein when the computer program is executed by a processor, the computer program implements the method according to any one of claims 1 to 8.