CN-122017576-A - Battery capacity early warning method, electronic equipment and storage medium

Abstract

The embodiment of the application discloses a battery capacity early warning method, electronic equipment and a storage medium, which are characterized by acquiring expansion force generated by a target battery in a target state of charge and discharge cycle times of the target battery when the expansion force is generated, acquiring a first association relationship, wherein the first association relationship is an association relationship between the charge and discharge cycle times and corresponding expansion force, determining expansion force change rates corresponding to the charge and discharge cycle times according to the first association relationship, and carrying out battery capacity water jump early warning on the battery in the target state of charge based on the expansion force change rates and the charge and discharge cycle times. Therefore, by using the change of the expansion force caused by the electrochemical change in the battery under the fixed charge state as an evaluation index of the battery capacity water jump, the battery capacity water jump phenomenon can be accurately predicted based on the battery aging mechanism, meanwhile, the realization difficulty of the battery capacity water jump early warning can be reduced, and the efficiency of the battery capacity water jump early warning is further improved.

Inventors

• CHEN JING
• YI HAOHAO

Assignees

• 武汉亿纬储能有限公司

Dates

Publication Date

20260512

Application Date

20251231

Claims (10)

1. 1. A battery capacity pre-warning method, comprising: Acquiring the expansion force generated by a target battery in a target state of charge and the charge and discharge cycle times of the target battery when the expansion force is generated; acquiring a first association relationship, wherein the first association relationship is an association relationship between the charge and discharge cycle times and the corresponding expansion force; Determining the expansion force change rate corresponding to each charge-discharge cycle number according to the first association relation; And carrying out battery capacity water jump early warning on the battery in the target state of charge based on the expansion force change rate and the charge and discharge cycle times.
2. 2. The battery capacity pre-warning method according to claim 1, wherein the performing battery capacity jump pre-warning on the battery in the target state of charge based on the expansion force change rate and the charge-discharge cycle number comprises: And under the condition that the expansion force change rate and the charge and discharge cycle times meet the corresponding preset conditions, performing battery capacity water jump early warning on the target battery in the target state of charge.
3. 3. The battery capacity pre-warning method according to claim 2, wherein, in the case where the expansion force change rate and the charge-discharge cycle number both satisfy corresponding preset conditions, performing battery capacity jump pre-warning on the target battery in the target state of charge, comprises: And under the condition that the charge-discharge cycle times are in a preset cycle times range and the expansion force change rate corresponding to the charge-discharge cycle times is larger than a preset change rate threshold, performing battery capacity water jump early warning on the target battery in the target state of charge.
4. 4. The battery capacity pre-warning method according to any one of claims 1 to 3, wherein the battery capacity jump pre-warning for the battery in the target state of charge based on the expansion force change rate and the charge-discharge cycle number, comprises: Determining a target expansion force change rate based on the expansion force change rate and the charge-discharge cycle number, the target expansion force change rate being used to indicate that the target battery is about to jump in battery capacity; acquiring the current charge-discharge cycle times of a battery to be predicted under the target state of charge, wherein the battery type of the battery to be predicted is the same as the battery type of the target battery; And carrying out battery capacity water jump early warning on the battery to be predicted based on the target charge-discharge cycle times corresponding to the target expansion force change rate and the current charge-discharge cycle times.
5. 5. The battery capacity warning method according to claim 4, wherein the determining a target expansion force change rate based on the expansion force change rate and the number of charge-discharge cycles includes: And when the charge and discharge cycle number is within a preset cycle number range, determining the expansion force change rate which is larger than a preset change rate threshold value as a target expansion force change rate, or determining the expansion force change rate which is larger than the preset change rate threshold value and is the maximum value as a target expansion force change rate.
6. 6. The battery capacity pre-warning method according to claim 4, wherein the performing battery capacity jump pre-warning on the battery to be predicted based on the target charge-discharge cycle number and the current charge-discharge cycle number corresponding to the target expansion force change rate includes: If the frequency difference between the current charge-discharge cycle times and the target charge-discharge cycle times corresponding to the target expansion force change rate is in a first preset frequency range, performing battery capacity water jump early warning on the battery to be predicted by adopting a first early warning mode; If the frequency difference between the current charge-discharge cycle times and the target charge-discharge cycle times corresponding to the target expansion force change rate is in a second preset frequency range, performing battery capacity water jump early warning on the battery to be predicted by adopting a second early warning mode; The number of times value in the first preset number of times range is larger than the number of times value in the second preset number of times range, and the early warning intensity of the first early warning mode is smaller than that of the second early warning mode.
7. 7. The battery capacity pre-warning method according to any one of claims 1 to 6, wherein the determining the expansion force change rate corresponding to each of the charge-discharge cycle numbers according to the first association relation includes: And performing differential processing on a curve constructed based on the charge-discharge cycle times and the expansion force according to the first association relation to obtain expansion force change rates corresponding to the charge-discharge cycle times.
8. 8. The battery capacity pre-warning method according to any one of claims 1 to 7, wherein the first association relationship is constructed by: Smoothing the expansion force corresponding to the charge-discharge cycle times based on a preset window to obtain smoothed expansion force corresponding to the charge-discharge cycle times; And performing curve fitting processing based on the charge-discharge cycle times and the corresponding smoothed expansion force to obtain a first association relation.
9. 9. An electronic device comprising a processor and a memory, wherein the memory stores a computer program that, when executed by the processor, causes the processor to perform the steps of the battery capacity warning method of any one of claims 1-8.
10. 10. A computer readable storage medium comprising a computer program for causing an electronic device to perform the steps of the battery capacity pre-warning method of any one of claims 1-8 when the computer program is run on the electronic device.

Description

Battery capacity early warning method, electronic equipment and storage medium Technical Field The application relates to the technical field of batteries, in particular to a battery capacity early warning method, electronic equipment and a storage medium. Background The battery capacity water-jump refers to the phenomenon that the battery capacity suddenly drops, and in an energy storage system, if the battery cell has capacity water-jump, the battery cell is connected with the inside of the battery cell to have the adverse problems of lithium dendrite, thickening of a solid electrolyte interface film (Solid Electrolyte Interphase, SEI film for short) and the like, so that potential safety hazards such as local overheating and short circuit of the battery are easily caused, and the battery needs to be subjected to capacity water-jump early warning in time. In the existing battery capacity early warning method, machine learning is often adopted to predict the battery health state or a capacity increment analysis mode is adopted to perform jump early warning on the battery capacity. However, the actual operation difficulty of the methods is high, and the battery capacity water jump problem cannot be accurately predicted, so that the battery capacity water jump early warning efficiency is low. Disclosure of Invention The embodiment of the application provides a battery capacity pre-warning method, electronic equipment and a storage medium, which can accurately predict the battery capacity water-jump phenomenon based on a battery aging mechanism, can reduce the difficulty of realizing the battery capacity water-jump pre-warning, and further improve the efficiency of the battery capacity water-jump pre-warning. The embodiment of the application provides a battery capacity early warning method, which comprises the following steps: Acquiring the expansion force generated by a target battery in a target state of charge and the charge and discharge cycle times of the target battery when the expansion force is generated; acquiring a first association relationship, wherein the first association relationship is an association relationship between the charge and discharge cycle times and the corresponding expansion force; Determining the expansion force change rate corresponding to each charge-discharge cycle number according to the first association relation; And carrying out battery capacity water jump early warning on the battery in the target state of charge based on the expansion force change rate and the charge and discharge cycle times. In an embodiment, the performing battery capacity jump pre-warning on the battery in the target state of charge based on the expansion force change rate and the charge and discharge cycle number includes: And under the condition that the expansion force change rate and the charge and discharge cycle times meet the corresponding preset conditions, performing battery capacity water jump early warning on the target battery in the target state of charge. Therefore, when the expansion force change rate and the charge and discharge cycle times meet the corresponding preset conditions, the problem that the battery in the target state of charge possibly has battery capacity water jump is determined, so that the battery capacity water jump early warning can be performed on the target battery in the target state of charge, and the battery capacity water jump early warning efficiency is improved. In an embodiment, the performing battery capacity jump pre-warning on the target battery in the target state of charge when the expansion force change rate and the charge and discharge cycle number both meet corresponding preset conditions includes: And under the condition that the charge-discharge cycle times are in a preset cycle times range and the expansion force change rate corresponding to the charge-discharge cycle times is larger than a preset change rate threshold, performing battery capacity water jump early warning on the target battery in the target state of charge. Therefore, when the charge-discharge cycle times are in the preset cycle times, and the expansion force change rate corresponding to the charge-discharge cycle times is larger than the preset change rate threshold, the problem that the battery is likely to generate battery capacity water jump is predicted, the accurate prediction of the battery capacity water jump can be realized based on a battery aging mechanism, meanwhile, the battery capacity water jump early warning is carried out on the battery based on the battery aging mechanism, the operation difficulty of the battery capacity water jump early warning can be reduced, and the battery capacity water jump early warning efficiency is further improved. In an embodiment, the performing battery capacity jump pre-warning on the battery in the target state of charge based on the expansion force change rate and the charge-discharge cycle number includes; Determining a target