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CN-121995247-A - Battery performance evaluation method, intelligent device and storage medium

CN121995247ACN 121995247 ACN121995247 ACN 121995247ACN-121995247-A

Abstract

The application relates to the technical field of batteries, in particular to a battery performance evaluation method, intelligent equipment and a storage medium, and aims to solve the technical problem of low accuracy of battery performance evaluation corresponding to the existing method. The battery performance evaluation method comprises the steps of performing capacity test on a battery to obtain first discharge capacity, second discharge capacity and third discharge capacity of the battery, determining performance indexes of the battery based on the first discharge capacity, the second discharge capacity and the third discharge capacity, and performing performance evaluation on the battery based on the performance indexes. By means of the method, more accurate battery performance indexes can be obtained according to different discharge capacities, so that quantification of the battery performance indexes is achieved, and the performance of the battery can be accurately estimated according to the battery performance indexes.

Inventors

  • MA LEILEI

Assignees

  • 蔚来汽车科技(安徽)有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (10)

  1. 1. A method of evaluating battery performance, the method comprising: Performing a capacity test on the battery to obtain a first discharge capacity, a second discharge capacity and a third discharge capacity of the battery, wherein the first discharge capacity is the discharge capacity of the battery in an initial state, the second discharge capacity is the discharge capacity of the battery in a first condition, and the third discharge capacity is the discharge capacity of the battery in a second condition; Determining a performance index of the battery based on the first, second, and third discharge capacities; And performing performance evaluation on the battery based on the performance index.
  2. 2. The battery performance evaluation method according to claim 1, wherein the obtaining the first discharge capacity of the battery includes: charging the battery to a preset SOC; Discharging the battery to a cut-off voltage according to a first discharge current; The first discharge capacity is determined based on the first discharge current and a first discharge duration.
  3. 3. The battery performance evaluation method according to claim 1, wherein the obtaining the second discharge capacity and the third discharge capacity of the battery comprises: charging the battery to a preset SOC; The battery is respectively placed at a first temperature and a second temperature for storage; and respectively carrying out discharge capacity tests on the batteries after the first temperature and the second temperature are stored, so as to obtain the second discharge capacity and the third discharge capacity.
  4. 4. The battery performance evaluation method according to claim 3, wherein the performing discharge capacity test on the battery after the first temperature and the second temperature storage, respectively, comprises: Discharging the battery stored at the first temperature to a cut-off voltage according to a second discharge current, and determining the second discharge capacity based on the second discharge current and a second discharge duration; and discharging the battery stored at the second temperature to a cut-off voltage according to a third discharge current, and determining the third discharge capacity based on the third discharge current and a third discharge duration.
  5. 5. The method of evaluating the performance of a battery according to claim 3, wherein said method further comprises applying a predetermined restraining force to said battery before said battery is stored at said first temperature and said second temperature, respectively.
  6. 6. The method of evaluating the performance of a battery according to claim 1, wherein the performance index of the battery comprises a chemical self-discharge duty cycle and a physical self-discharge duty cycle at a first temperature, wherein the determining the performance index of the battery based on the first discharge capacity, the second discharge capacity, and the third discharge capacity comprises: Determining a first difference between the first discharge capacity and the second discharge capacity, a second difference between the third discharge capacity and the second discharge capacity, and a third difference between the first discharge capacity and the third discharge capacity; Determining the chemical self-discharge duty cycle based on a ratio between the second difference and the first difference; the physical self-discharge duty cycle is determined based on a ratio between the third difference and the first difference.
  7. 7. The battery performance evaluation method according to claim 6, wherein a sum of the chemical self-discharge duty ratio and the physical self-discharge duty ratio is 1.
  8. 8. The battery performance evaluation method according to claim 1, wherein the performance index of the battery includes a chemical self-discharge duty cycle and a physical self-discharge duty cycle at a first temperature; the performance evaluation of the battery based on the performance index includes: When the chemical self-discharge duty ratio is smaller than a first threshold value, the chemical self-discharge performance of the battery is qualified; And when the physical self-discharge duty ratio is smaller than a second threshold value, the physical self-discharge performance of the battery is qualified.
  9. 9. An intelligent device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; Wherein the memory has stored therein a computer program which, when executed by the at least one processor, implements the battery performance assessment method of any one of claims 1 to 8.
  10. 10. A computer readable storage medium having stored therein a plurality of program codes, wherein the program codes are adapted to be loaded and executed by a processor to perform the battery performance evaluation method of any one of claims 1 to 8.

Description

Battery performance evaluation method, intelligent device and storage medium Technical Field The invention relates to the technical field of batteries, and particularly provides a battery performance evaluation method, intelligent equipment and a storage medium. Background In the application process of the lithium ion battery, two attenuation modes, namely cycle attenuation and calendar attenuation exist, and the corresponding service lives are the cycle life and the calendar life of the lithium ion battery. Among the key factors affecting the calendar life of lithium ion batteries are chemical self-discharge and physical self-discharge. Physical self-discharge is affected by burrs, dust, metal impurities and the like in the lithium ion battery manufacturing process, and chemical self-discharge is affected by moisture, electrolyte components, SE I film stability and the like. Therefore, the method analyzes the factors affecting the calendar life, quantifies the degree of physical self-discharge and chemical self-discharge, and has important significance in optimizing the battery design and improving the battery performance. The existing method cannot quantify the degree of physical self-discharge and chemical self-discharge, so that the accuracy of battery performance evaluation is low, and the actual requirements are difficult to meet. Disclosure of Invention The present application has been made to overcome the above-mentioned drawbacks, and provides a solution or at least partially solves the technical problem of the existing methods that the accuracy of the battery performance evaluation is low. The application provides a battery performance evaluation method, intelligent equipment and a storage medium. In a first aspect, the present application provides a battery performance evaluation method, the method comprising: Performing a capacity test on the battery to obtain a first discharge capacity, a second discharge capacity and a third discharge capacity of the battery, wherein the first discharge capacity is the discharge capacity of the battery in an initial state, the second discharge capacity is the discharge capacity of the battery in a first condition, and the third discharge capacity is the discharge capacity of the battery in a second condition; Determining a performance index of the battery based on the first, second, and third discharge capacities; And performing performance evaluation on the battery based on the performance index. In one embodiment of the present application, the obtaining the first discharge capacity of the battery includes: charging the battery to a preset SOC; Discharging the battery to a cut-off voltage according to a first discharge current; The first discharge capacity is determined based on the first discharge current and a first discharge duration. In one embodiment of the present application, the obtaining the second discharge capacity and the third discharge capacity of the battery includes: charging the battery to a preset SOC; The battery is respectively placed at a first temperature and a second temperature for storage; and respectively carrying out discharge capacity tests on the batteries after the first temperature and the second temperature are stored, so as to obtain the second discharge capacity and the third discharge capacity. In one embodiment of the present application, the performing a discharge capacity test on the battery after the first temperature and the second temperature are stored, respectively, includes: Discharging the battery stored at the first temperature to a cut-off voltage according to a second discharge current, and determining the second discharge capacity based on the second discharge current and a second discharge duration; and discharging the battery stored at the second temperature to a cut-off voltage according to a third discharge current, and determining the third discharge capacity based on the third discharge current and a third discharge duration. In one embodiment of the application, the method further comprises applying a predetermined restraining force to the battery prior to storing the battery at the first temperature and the second temperature, respectively. In one embodiment of the application, the performance index of the battery comprises a chemical self-discharge duty cycle and a physical self-discharge duty cycle at a first temperature, and the determining the performance index of the battery based on the first discharge capacity, the second discharge capacity and the third discharge capacity comprises: Determining a first difference between the first discharge capacity and the second discharge capacity, a second difference between the third discharge capacity and the second discharge capacity, and a third difference between the first discharge capacity and the third discharge capacity; Determining the chemical self-discharge duty cycle based on a ratio between the second difference and the first difference; the ph