US 11,906,590 B2
Method and device for detecting abnormality of lithium battery, battery management system, and battery system
Zhi Liu, Ningde (CN); and Dongyang Shi, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed on Apr. 11, 2022, as Appl. No. 17/717,605.
Application 17/717,605 is a continuation of application No. PCT/CN2021/074249, filed on Jan. 28, 2021.
Prior Publication US 2022/0236333 A1, Jul. 28, 2022
Int. Cl. G01R 15/00 (2006.01); G01R 31/3835 (2019.01); H02J 7/00 (2006.01); H01M 10/48 (2006.01); H01M 10/42 (2006.01); B60L 3/00 (2019.01); B60L 58/12 (2019.01); B60L 53/62 (2019.01); B60L 50/60 (2019.01)
CPC G01R 31/3835 (2019.01) [B60L 3/0046 (2013.01); B60L 50/60 (2019.02); B60L 53/62 (2019.02); B60L 58/12 (2019.02); H01M 10/425 (2013.01); H01M 10/48 (2013.01); H02J 7/0048 (2020.01); H01M 2010/4271 (2013.01); H01M 2220/20 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for detecting abnormality of a lithium battery, comprising:
obtaining a state of charge (SOC) value of the lithium battery in a charge process, wherein the SOC value is a ratio of a remaining capacity of the battery to a nominal capacity of the battery;
changing a value of a charge current at a time point corresponding to an arbitrary SOC value, and obtaining a response signal within a time period of maintaining the changed charge current; and
determining, based on response signals at time points corresponding to a plurality of SOC values, whether the lithium battery is abnormal;
wherein the response signal is a voltage signal;
the determining, based on response signals at time points corresponding to a plurality of SOC values, whether the lithium battery (102) is abnormal comprises:
obtaining a first voltage value in an Nth voltage signal at a start time point of a first preset duration, and obtaining a second voltage value in the Nth voltage signal at an end time point of the first preset duration, wherein the first preset duration is an arbitrary time period within the time period of maintaining the charge current changed each time;
obtaining an Nth voltage variation value based on an absolute value of a difference between the first voltage value and the second voltage value in the Nth voltage signal; and
determining, based on the voltage variation value, whether the lithium battery (102) is abnormal.