Terminal device and method for detecting lithium separation of a battery

Patent metadata

Field	Value
Publication number	US-11205808-B2
Application number	US-201916529930-A
Country	US
Kind code	B2
Filing date	Aug 2, 2019
Priority date	May 31, 2019
Publication date	Dec 21, 2021
Grant date	Dec 21, 2021

Abstract

A method for detecting a lithium separation phenomenon of a battery of a terminal device is provided. The method includes detecting a working state of the battery, and collecting a first voltage of the battery when the working state of the battery is the resting state. The method further include collecting a second voltage of the battery when the battery is left to stand for a preset period of time, and determining whether the lithium separation phenomenon has occurred according to the first voltage and the second voltage. The implementation of the application can detect whether the lithium separation phenomenon has occurred in the battery and trigger a protection circuit of the battery in time when the lithium separation phenomenon has occurred in the battery.

First claim

What is claimed is:

1. A battery lithium detection method applicable in a terminal device, the terminal device comprising a battery, the method comprising:
detecting a working state of the battery;
collecting a first voltage of the battery when the working state of the battery is a resting state;
collecting a second voltage of the battery when the battery is left to stand for a preset period of time; and
determining whether a lithium separation phenomenon has occurred in the battery according to a comparison of a calculated difference in the first voltage and the second voltage with a preset voltage value.

2. The method according to claim 1 , wherein the detecting the working state of the battery comprising:
collecting a first current value of the battery every first time interval and obtaining a plurality of first current values; and
determining the working state of the battery by comparing each of the plurality of first current values with a current threshold.

3. The method according to claim 2 , wherein determining the working state of the battery comprising:
the working state of the battery is a charging state when each of the plurality of first current values is greater than the current threshold;
the working state of the battery is a discharging state when each of the plurality of first current values is less than an opposite value of the current threshold; and
the working state of the battery is a resting state when an absolute value of the first current value is less than or equal to the current threshold.

4. The method according to claim 3 , wherein collecting the first voltage of the battery comprising:
collecting the first voltage of the battery when the detected working state of the battery is the resting state and a latest recorded working state of a historical working state is the charging state.

5. The method according to claim 4 , wherein the method further comprising:
determining that the working state of the battery has changed from the charging state to the resting state;
collecting a second current value of the battery when the battery has been resting for a second time interval;
comparing the second current value with the current threshold; and
collecting the first voltage of the battery when an absolute value of the second current value is less than or equal to the current threshold.

6. The method according to claim 1 , wherein collecting the second voltage of the battery comprising:
collecting a third current value of the battery when the battery is left to stand for the preset period of time;
comparing the third current value with a current threshold; and
collecting the second voltage of the battery when an absolute value of the third current value is less than or equal to the current threshold.

7. The method according to claim 1 , wherein the determining whether the lithium separation phenomenon has occurred comprising:
calculating a difference of the second voltage minus the first voltage;
comparing the difference with the preset voltage value; and
determining that the lithium separation phenomenon has occurred in the battery when the difference is greater than the preset voltage value.

8. The method according to claim 7 , wherein the method further comprising:
triggering a protection circuit of the battery when the lithium separation phenomenon has occurred in the battery.

9. A non-transitory storage medium having stored thereon instructions that, when executed by a processor of a terminal device, causes the processor to perform a battery lithium detection method, the terminal device comprising a battery, the method comprising:
detecting a working state of the battery;
collecting a first voltage of the battery when the working state of the battery is a resting state;
collecting a second voltage of the battery when the battery is left to stand for a preset period of time; and
determining whether a lithium separation phenomenon has occurred in the battery according to a comparison of a calculated difference in the first voltage and the second voltage with a preset voltage value.

10. The non-transitory storage medium according to claim 9 ,
wherein the detecting the working state of the battery comprising:
collecting a first current value of the battery every first time interval and obtaining a plurality of first current values; and
determining the working state of the battery by comparing each of the plurality of first current values with a current threshold.

11. The non-transitory storage medium according to claim 9 , wherein collecting the second voltage of the battery comprising:
collecting a third current value of the battery when the battery is left to stand for the preset period of time;
comparing the third current value with a current threshold; and
collecting the second voltage of the battery when an absolute value of the third current value is less than or equal to the current threshold.

12. The non-transitory storage medium according to claim 9 , wherein the determining whether the lithium separation phenomenon has occurred comprising:
calculating a difference of the second voltage minus the first voltage;
comparing the difference with the preset voltage value; and
determining that the lithium separation phenomenon has occurred in the battery when the difference is greater than the preset voltage value.

Assignees

• Dongguan Amperex Tech Ltd

Inventors

• Yang Chao
• Liu Xuefeng
• Luo Jianchang
• Chen Jinhui
• Wang Ying
• Chen Guanghui
• Bian Chunhua

Classifications

• H02J7/63

  against overdischarge · CPC title

• H02J7/61

  against overcharge · CPC title

• H02J7/60

  including safety or protection arrangements · CPC title

• H01M10/4285 Primary

  Testing apparatus · CPC title

• H02J7/875

  Charging or discharging for charge maintenance, battery initiation or rejuvenation · CPC title