Battery charging method and system based on lithium plating detection, and automobile and medium

Patent metadata

Field	Value
Publication number	US-2023231403-A1
Application number	US-202318189474-A
Country	US
Kind code	A1
Filing date	Mar 24, 2023
Priority date	Sep 27, 2020
Publication date	Jul 20, 2023
Grant date	—

Abstract

A battery charging method based on lithium plating detection includes: acquiring a battery charging strategy table after receiving a battery charging instruction; charging a battery according to a charging current in the battery charging strategy table, and performing at least one charging lithium plating detection on the battery during the charging of the battery, to obtain a first lithium plating detection result; continuing the charging of the battery according to the charging current and the charging lithium plating detection of the battery when no lithium plating phenomenon occurs, and stopping the charging lithium plating detection when the lithium plating phenomenon occurs or the charging of the battery is completed; and updating the charging current according to a preset first current reduction strategy when the lithium plating phenomenon occurs, and continuing the charging of the battery according to the updated charging current until the charging is completed.

First claim

What is claimed is:

1 . A battery charging method based on lithium plating detection, comprising:
acquiring a battery charging strategy table after receiving a battery charging instruction; charging a battery according to a charging current in the battery charging strategy table, and performing at least one charging lithium plating detection on the battery during the charging of the battery, to obtain a first lithium plating detection result; continuing the charging of the battery according to the charging current and the charging lithium plating detection of the battery during the charging of the battery when the first lithium plating detection result is that no lithium plating phenomenon occurs, and stopping the charging lithium plating detection of the battery when the first lithium plating detection result is that the lithium plating phenomenon occurs or the charging of the battery is completed; and updating the charging current in the battery charging strategy table according to a preset first current reduction strategy when the first lithium plating detection result is that the lithium plating phenomenon occurs, and continuing the charging of the battery according to the updated charging current until the charging of the battery is completed.

2 . The battery charging method according to claim 1 , wherein after the charging of the battery is completed, the method comprises:
performing lithium plating detection on the battery after the charging of the battery is completed and the battery is in an static state, to obtain a second lithium plating detection result; and updating the charging current in the battery charging strategy table according to a preset second current reduction strategy when the second lithium plating detection result is that the lithium plating phenomenon occurs.

3 . The battery charging method according to claim 2 , wherein the performing lithium plating detection on the battery after the charging of the battery is completed and the battery is in an static state, to obtain a second lithium plating detection result comprises:
regularly collecting a voltage of the battery at a preset time interval after the charging of the battery is completed and the battery is in an static state, and associatively storing the collected voltage and a collection time of the voltage as voltage data; constructing a time-differential voltage curve in a voltage-time coordinate system according to the voltage data; and obtaining the second lithium plating detection result according to the time-differential voltage curve and a preset peak identification algorithm.

4 . The battery charging method according to claim 3 , wherein the updating the charging current in the battery charging strategy table according to a preset second current reduction strategy comprising:
identifying a characteristic peak voltage in the time-differential voltage curve through the preset peak identification algorithm, and recording a corresponding stable voltage when the time-differential voltage curve reaches a preset stability standard after determining the characteristic peak voltage; determining a first region area and a second region area in the voltage-time coordinate system according to the characteristic peak voltage, the stable voltage, and the time-differential voltage curve; determining a lithium plating representation amount of the battery according to the first region area and the second region area; and updating the charging current in the battery charging strategy table according to the lithium plating representation amount and a preset battery lithium plating standard.

5 . The battery charging method according to claim 1 , wherein the performing at least one charging lithium plating detection on the battery during the charging of the battery, to obtain a first lithium plating detection result comprises:
acquiring a first electrochemical impedance and a second electrochemical impedance of the battery at a preset frequency according to a preset SOC variation, wherein the preset SOC variation is equal to a difference between a second SOC value and a first SOC value; the first SOC value corresponds to the first electrochemical impedance; the second SOC value corresponds to the second electrochemical impedance; and the first SOC value and the second SOC value are both greater than a preset SOC threshold; and acquiring the first lithium plating detection result according to the first electrochemical impedance and the second electrochemical impedance.

6 . The battery charging method according to claim 5 , wherein the acquiring the first lithium plating detection result of the battery according to the first electrochemical impedance and the second electrochemical impedance comprises:
determining that the first lithium plating detection result is that the lithium plating phenomenon occurs when the first electrochemical impedance is greater than the second electrochemical impedance; and determining that the first lithium plating detection result is that no lithium plating phenomenon occurs when the first electrochemical impedance is less than or equal to the second electrochemical impedance.

7 . A battery charging system based on lithium plating detection, comprising:
a charging strategy table acquisition module, configured to acquire a battery charging strategy table after receiving a battery charging instruction; a charging lithium plating detection module, configured to charge a battery according to a charging current in the battery charging strategy table, and perform at least one charging lithium plating detection on the battery during the charging of the battery, to obtain a first lithium plating detection result; a first charging module, configured to: continue the charging of the battery according to the charging current and the charging lithium plating detection of the battery during the charging of the battery when the first lithium plating detection result is that no lithium plating phenomenon occurs, and stop the charging lithium plating detection of the battery when the first lithium plating detection result is that the lithium plating phenomenon occurs or the charging of the battery is completed; and a second charging module, configured to update the charging current in the battery charging strategy table according to a preset first current reduction strategy when the first lithium plating detection result is that the lithium plating phenomenon occurs, and continue the charging of the battery according to the updated charging current until the charging of the battery is completed.

8 . The battery charging system according to claim 7 , further comprising:
an lithium plating detection module, configured to perform lithium plating detection on the battery after the charging of the battery is completed and the battery is in an static state, to obtain a second lithium plating detection result; and a charging current updating module, configured to update the charging current in the battery charging strategy table according to a preset second current reduction strategy when the second lithium plating detection result is that the lithium plating phenomenon occurs.

9 . A vehicle, comprising the battery charging system based on lithium plating detection according to claim 7 .

10 . A non-transitory computer-readable storage medium storing computer-executable instructions for, when executed by one or more processors, performing a battery charging method based on lithium plating detection, the method comprising:
acquiring a battery charging strategy table after receiving a battery charging instruction; charging a battery according to a charging current in the battery charging strategy table, an

Assignees

• Byd Co Ltd

Inventors

• Feng Tianyu
• Shu Shiwei
• Deng Linwang
• Li Xiaoqian

Classifications

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J7/94 Primary

  in response to battery current · CPC title

• H02J7/933

  the cycle being controlled or terminated in response to electric parameters · CPC title

• H02J7/971

  the charge cycle being controlled or terminated in response to non-electric parameters · CPC title

• H02J7/963

  in response to battery voltage gradient · CPC title