CN-121989750-A - Battery management method, electronic device, system, vehicle, storage medium, and product

Abstract

The present disclosure relates to a battery management method, an electronic device, a system, a vehicle, a storage medium, and a product. The method comprises the steps of obtaining a first expansion pressure value of the battery at the current circle number, determining a charging strategy of the battery according to the current circle number and the first expansion pressure value, and charging the battery according to the charging strategy. Because the expansion pressure value of the battery at the current cycle number is considered when the charging strategy of the battery is determined, and the charging SOC is adjusted according to the expansion pressure value, the embodiment of the disclosure can achieve the purposes of prolonging the service life of the battery and improving the service performance of the battery by sacrificing the SOC of the battery.

Inventors

• XU JIANZHOU
• TU JUN
• LI HAOLIN
• TAN JING
• LU ZHIPEI

Assignees

• 比亚迪股份有限公司

Dates

Publication Date

20260508

Application Date

20241105

Claims (16)

1. 1. A method of battery management, the method comprising: acquiring a first expansion pressure value of the battery at the current cycle number; Determining a charging strategy of the battery according to the current cycle number and the first expansion pressure value; and charging the battery according to the charging strategy.
2. 2. The method of claim 1, wherein said determining a charging strategy for the battery based on the current number of cycles and the first inflation pressure value comprises: And determining a charging strategy of the battery according to the current cycle number, the first expansion pressure value and a battery life fitting curve, wherein the battery life fitting curve represents the expansion pressure value corresponding to the battery in different residual cycle numbers.
3. 3. The method of claim 2, wherein the determining the charging policy of the battery comprises: obtaining the residual cycle number of the battery according to the current cycle number and the theoretical cycle number; When the first expansion pressure value is larger than a second expansion pressure value corresponding to the residual cycle number in the battery life fitting curve, determining that the charging strategy of the battery is an undercharging strategy; And when the first expansion pressure value is smaller than or equal to the second expansion pressure value, determining that the charging strategy of the battery is a full charge strategy.
4. 4. A method according to claim 3, wherein said charging said battery according to said charging strategy comprises: Under the condition that the charging strategy of the battery is an undercharging strategy, determining a target SOC value corresponding to the second expansion pressure value according to an SOC fitting curve of the battery, wherein the SOC fitting curve represents the expansion pressure value corresponding to the battery in different SOCs; and charging the battery until the SOC of the battery reaches the target SOC.
5. 5. The method of any one of claims 1-4, further comprising: obtaining an internal resistance fitting curve of the battery, wherein the internal resistance fitting curve represents the corresponding internal resistance value of the battery in different cycle numbers; and determining whether the internal resistance of the battery is abnormal according to the internal resistance fitting curve.
6. 6. The method of claim 5, wherein determining whether the internal resistance of the battery is abnormal based on the internal resistance fitting curve comprises: When the slope of the internal resistance fitting curve is smaller than or equal to a first threshold value, determining that the internal resistance of the battery is not abnormal; And when the slope of the internal resistance fitting curve is larger than the first threshold value, determining that the internal resistance of the battery is abnormal.
7. 7. The method of any one of claims 1-4, further comprising: Acquiring a self-discharge fitting curve of the battery, wherein the self-discharge fitting curve represents the accumulated self-discharge electric quantity of the battery in different time; And determining whether the self-discharge of the battery is abnormal according to the self-discharge fitting curve.
8. 8. The method of claim 7, wherein determining whether the self-discharge of the battery is abnormal based on the self-discharge fit curve comprises: determining that the self-discharge of the battery is not abnormal under the condition that the slope of the self-discharge fitting curve is smaller than or equal to a second threshold value; and determining that the self-discharge of the battery is abnormal under the condition that the slope of the self-discharge fitting curve is larger than the second threshold value.
9. 9. The method of claim 8, wherein the method further comprises: and under the condition that the self-discharge of the battery is abnormal, determining the reason of the self-discharge abnormality of the battery according to the self-discharge fitting curve.
10. 10. The method of claim 9, wherein determining the cause of the battery self-discharge abnormality from the self-discharge fit curve comprises: Under the condition that the slope of the self-discharge fitting curve is larger than the second threshold value and smaller than a third threshold value, determining that the reason of the self-discharge abnormality is that the pressure of the expansion surface of the battery is overlarge, the electrolyte is thinned, and micro-short circuit occurs at the positive electrode and the negative electrode; and determining that the self-discharge abnormality is caused by lithium puncture under the condition that the slope of the self-discharge fitting curve is greater than or equal to the third threshold, wherein the second threshold is smaller than the third threshold.
11. 11. The method according to any one of claims 2-4, further comprising: And determining the residual life of the battery according to the battery life fitting curve and the first expansion pressure value of the battery.
12. 12. An electronic device, comprising: A memory having a computer program stored thereon; A processor for executing the computer program in the memory to implement the steps of the method of any one of claims 1-11.
13. 13. A power battery system comprising the battery according to any one of claims 1 to 11 and the electronic device according to claim 12.
14. 14. A vehicle comprising the electronic device of claim 12 and the battery of any one of claims 1-11 or the power battery system of claim 13.
15. 15. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor realizes the steps of the method according to any of claims 1-11.
16. 16. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1-11.

Description

Battery management method, electronic device, system, vehicle, storage medium, and product Technical Field The present disclosure relates to the field of battery management technologies, and in particular, to a battery management method, an electronic device, a system, a vehicle, a storage medium, and a product. Background The solid-state battery is a battery using a solid electrode and a solid electrolyte, and unlike a conventional lithium ion battery, the solid-state battery uses a glass compound made of lithium and sodium as a conductive material instead of a conventional electrolyte, thereby greatly improving energy density. The solid-state battery is used as an energy storage device, and is also required to be subjected to daily charge and discharge management like a common battery so as to meet the normal operation of electric equipment. At present, the problem that the battery expansion pressure is not enough in application management of solid-state batteries, especially in charging management, causes improper charging behavior in charging management of the battery, and thus the service life of the battery is shortened, and the performance is reduced is solved. Disclosure of Invention In order to solve the technical problems, the present disclosure provides a battery management method, an electronic device, a system, a vehicle, a storage medium and a product. According to a first aspect of embodiments of the present disclosure, there is provided a battery management method, the method including: acquiring a first expansion pressure value of the battery at the current cycle number; Determining a charging strategy of the battery according to the current cycle number and the first expansion pressure value; and charging the battery according to the charging strategy. Optionally, the determining the charging strategy of the battery according to the current cycle number and the first expansion pressure value includes: And determining a charging strategy of the battery according to the current cycle number, the first expansion pressure value and a battery life fitting curve, wherein the battery life fitting curve represents the expansion pressure value corresponding to the battery in different residual cycle numbers. Optionally, the determining the charging policy of the battery includes: obtaining the residual cycle number of the battery according to the current cycle number and the theoretical cycle number; When the first expansion pressure value is larger than a second expansion pressure value corresponding to the residual cycle number in the battery life fitting curve, determining that the charging strategy of the battery is an undercharging strategy; And when the first expansion pressure value is smaller than or equal to the second expansion pressure value, determining that the charging strategy of the battery is a full charge strategy. Optionally, the charging the battery according to the charging policy includes: Under the condition that the charging strategy of the battery is an undercharging strategy, determining a target SOC value corresponding to the second expansion pressure value according to an SOC fitting curve of the battery, wherein the SOC fitting curve represents the expansion pressure value corresponding to the battery in different SOCs; and charging the battery until the SOC of the battery reaches the target SOC. Optionally, the method further comprises: obtaining an internal resistance fitting curve of the battery, wherein the internal resistance fitting curve represents the corresponding internal resistance value of the battery in different cycle numbers; and determining whether the internal resistance of the battery is abnormal according to the internal resistance fitting curve. Optionally, the determining whether the internal resistance of the battery is abnormal according to the internal resistance fitting curve includes: When the slope of the internal resistance fitting curve is smaller than or equal to a first threshold value, determining that the internal resistance of the battery is not abnormal; And when the slope of the internal resistance fitting curve is larger than the first threshold value, determining that the internal resistance of the battery is abnormal. Optionally, the method further comprises: Acquiring a self-discharge fitting curve of the battery, wherein the self-discharge fitting curve represents the accumulated self-discharge electric quantity of the battery in different time; And determining whether the self-discharge of the battery is abnormal according to the self-discharge fitting curve. Optionally, the determining whether the self-discharge of the battery is abnormal according to the self-discharge fitting curve includes: determining that the self-discharge of the battery is not abnormal under the condition that the slope of the self-discharge fitting curve is smaller than or equal to a second threshold value; and determining that the self-discharge of the