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CN-122017637-A - Evaluation method of battery charging capability, rapid charging method, device and medium

CN122017637ACN 122017637 ACN122017637 ACN 122017637ACN-122017637-A

Abstract

The application relates to the technical field of batteries, in particular to a battery charging capacity evaluation method, a quick charging method, quick charging equipment and a medium, and aims to solve the technical problem of low safety and stability of the existing method. The method for evaluating the battery charging capacity comprises the steps of obtaining a preset charging interval, calibrating the charging capacity at a preset multiplying power in the preset charging interval to obtain target coulomb efficiency under the preset multiplying power, and evaluating the battery charging capacity based on the target coulomb efficiency. In this way, by calibrating the charging capacity at a preset multiplying power in a preset charging interval, a more accurate target coulomb efficiency can be obtained, so that the charging capacity of the battery can be accurately estimated. The charging rate is optimized based on the evaluation result of the target coulomb efficiency, and the quick charging performance of the battery can be improved, so that the charging time is shortened, and the use experience of a user is improved.

Inventors

  • MA LEILEI

Assignees

  • 蔚来汽车科技(安徽)有限公司

Dates

Publication Date
20260512
Application Date
20241105

Claims (10)

  1. 1. A method of evaluating battery charging capability, the method comprising: Acquiring a preset charging interval; calibrating charging capacity in the preset charging interval at a preset multiplying power to obtain target coulomb efficiency under the preset multiplying power; the charge capacity of the battery is evaluated based on the target coulombic efficiency.
  2. 2. The method of evaluating battery charge capacity of claim 1, wherein the target coulombic efficiency comprises a first set of coulombic efficiencies and a second set of coulombic efficiencies; the calibrating the charging capacity in the preset charging interval with a preset multiplying power comprises the following steps: Performing multi-cycle charge and discharge testing at a first multiplying power in the preset charge interval to obtain the first coulombic efficiency set; And performing multi-cycle charge and discharge testing at a second multiplying power in the preset charge interval to obtain the second coulombic efficiency set.
  3. 3. The method of evaluating battery chargeability according to claim 2, wherein the first magnification is smaller than the second magnification, the second magnification being at least one magnification in the range of [2c,10c ].
  4. 4. The method of evaluating battery charge capacity according to claim 2, wherein the performing the multi-cycle charge-discharge test at the first rate includes: constant-current charging is carried out on the battery to n% of SOC (state of charge) at the first multiplying power, constant-current discharging is carried out on the battery to a preset cut-off voltage at the third multiplying power, and coulomb efficiency corresponding to the n% of SOC is obtained; Constant-current charging is carried out on the battery to 2n percent of SOC at the first multiplying power, constant-current discharging is carried out on the battery to a preset cut-off voltage at the third multiplying power, and coulomb efficiency corresponding to the 2n percent of SOC is obtained; Repeating the steps until the battery is charged to m% of SOC at the first multiplying power, and discharging the battery to a preset cut-off voltage at the third multiplying power, so as to obtain coulomb efficiency corresponding to m% of SOC, wherein m is the maximum value of the preset charging interval, and n is more than or equal to 0 and less than or equal to m.
  5. 5. The method of evaluating battery charge capacity according to claim 2, wherein the performing the multi-cycle charge-discharge test at the second magnification includes: Constant-current charging is carried out on the battery to n% of SOC (state of charge) at the second multiplying power, constant-current discharging is carried out on the battery to a preset cut-off voltage at the third multiplying power, and coulomb efficiency corresponding to the n% of SOC is obtained; constant-current charging is carried out on the battery to 2n percent of SOC at the second multiplying power, constant-current discharging is carried out on the battery to a preset cut-off voltage at the third multiplying power, and coulomb efficiency corresponding to the 2n percent of SOC is obtained; Repeating the steps until the battery is charged to m% of SOC at the second multiplying power, and discharging the battery to a preset cut-off voltage at the third multiplying power, so as to obtain coulomb efficiency corresponding to m% of SOC, wherein m is the maximum value of the preset charging interval, and n is more than or equal to 0 and less than or equal to m.
  6. 6. The method of evaluating the charge capacity of a battery according to claim 2, characterized in that the evaluating the charge capacity of the battery based on the target coulombic efficiency comprises: acquiring a difference value between the corresponding coulombic efficiencies of each SOC in the first coulombic efficiency set and the second coulombic efficiency set; when the difference value is larger than a preset threshold value, obtaining the SOC corresponding to the second multiplying power; the charging capability of the battery is obtained based on the SOC corresponding to the second magnification.
  7. 7. The method of claim 1, wherein the predetermined charging interval is [0, x%soc ], where X is less than or equal to 95.
  8. 8. A method of rapidly charging a battery, the method comprising: The battery charging capability assessment method according to any one of claims 1 to 7, wherein the battery charging capability is assessed; the battery is rapidly charged based on the charging capability of the battery.
  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 method of evaluating battery charging capability of any one of claims 1 to 7, or performs the method of fast battery charging of claim 8.
  10. 10. A computer readable storage medium, in which a plurality of program codes are stored, characterized in that the program codes are adapted to be loaded and executed by a processor to perform the method of evaluating battery charging capability of any one of claims 1 to 7, or to perform the method of fast battery charging of claim 8.

Description

Evaluation method of battery charging capability, rapid charging method, device and medium Technical Field The invention relates to the technical field of batteries, and particularly provides a battery charging capacity evaluation method, a quick charging method, quick charging equipment and a medium. Background With the popularity of smart devices, there is an increasing demand for electrochemical devices (e.g., batteries) therein. For example, batteries are required not only to be lightweight, but also to possess short charging times and long operating lives. The long charging time is one of factors restricting the rapid popularization of intelligent equipment, and the existing charging method is to increase the charging current, but the unrestricted increase of the charging current can lead to lithium precipitation of the negative electrode of the battery, so that the safety performance and the cycle stability performance of the battery are affected. Disclosure of Invention The present application has been made to overcome the above drawbacks, and to provide a solution or at least partially solve the technical problems of low safety and stability of the existing methods. The application provides a battery charging capability assessment method, a quick charging device and a medium. In a first aspect, the present application provides a method of evaluating battery charging capability, the method comprising: Acquiring a preset charging interval; calibrating charging capacity in the preset charging interval at a preset multiplying power to obtain target coulomb efficiency under the preset multiplying power; the charge capacity of the battery is evaluated based on the target coulombic efficiency. In one embodiment of the application, the target coulombic efficiency comprises a first set of coulombic efficiencies and a second set of coulombic efficiencies; the calibrating the charging capacity in the preset charging interval with a preset multiplying power comprises the following steps: Performing multi-cycle charge and discharge testing at a first multiplying power in the preset charge interval to obtain the first coulombic efficiency set; And performing multi-cycle charge and discharge testing at a second multiplying power in the preset charge interval to obtain the second coulombic efficiency set. In one embodiment of the present application, the first magnification is smaller than the second magnification, which is at least one magnification in the range of [2c,10c ]. In one embodiment of the present application, the multi-cycle charge-discharge test performed at a first rate includes: constant-current charging is carried out on the battery to n% of SOC (state of charge) at the first multiplying power, constant-current discharging is carried out on the battery to a preset cut-off voltage at the third multiplying power, and coulomb efficiency corresponding to the n% of SOC is obtained; Constant-current charging is carried out on the battery to 2n percent of SOC at the first multiplying power, constant-current discharging is carried out on the battery to a preset cut-off voltage at the third multiplying power, and coulomb efficiency corresponding to the 2n percent of SOC is obtained; Repeating the steps until the battery is charged to m% of SOC at the first multiplying power, and discharging the battery to a preset cut-off voltage at the third multiplying power, so as to obtain coulomb efficiency corresponding to m% of SOC, wherein m is the maximum value of the preset charging interval, and n is more than or equal to 0 and less than or equal to m. In one embodiment of the application. The multi-cycle charge and discharge test at the second multiplying power comprises the following steps: Constant-current charging is carried out on the battery to n% of SOC (state of charge) at the second multiplying power, constant-current discharging is carried out on the battery to a preset cut-off voltage at the third multiplying power, and coulomb efficiency corresponding to the n% of SOC is obtained; constant-current charging is carried out on the battery to 2n percent of SOC at the second multiplying power, constant-current discharging is carried out on the battery to a preset cut-off voltage at the third multiplying power, and coulomb efficiency corresponding to the 2n percent of SOC is obtained; Repeating the steps until the battery is charged to m% of SOC at the second multiplying power, and discharging the battery to a preset cut-off voltage at the third multiplying power, so as to obtain coulomb efficiency corresponding to m% of SOC, wherein m is the maximum value of the preset charging interval, and n is more than or equal to 0 and less than or equal to m. In one embodiment of the present application, the estimating the charge capacity of the battery based on the target coulombic efficiency comprises: acquiring a difference value between the corresponding coulombic efficiencies of each SOC in the first coulombic e