US 11,656,289 B2
Method and apparatus for correcting state of health of battery, management system, and storage medium
Mingshu Du, Ningde (CN); Shichao Li, Ningde (CN); Shenzhi Tang, Ningde (CN); Yanhua Lu, Ningde (CN); and Wei Zhang, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Fujian (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED, Ningde (CN)
Filed on Dec. 15, 2020, as Appl. No. 17/123,001.
Application 17/123,001 is a continuation of application No. PCT/CN2020/084335, filed on Apr. 11, 2020.
Claims priority of application No. 201910338521.0 (CN), filed on Apr. 25, 2019.
Prior Publication US 2021/0141028 A1, May 13, 2021
Int. Cl. G01R 31/392 (2019.01); H02J 7/00 (2006.01); G01R 31/36 (2020.01)
CPC G01R 31/392 (2019.01) [G01R 31/3648 (2013.01); H02J 7/005 (2020.01); H02J 7/0049 (2020.01)] 14 Claims
OG exemplary drawing
 
1. A method for correcting a state of health (SOH) of a battery cell, performed at an apparatus that is communicatively connected to the battery cell and including a processor and memory, the method comprising:
establishing a connection between the apparatus and the battery cell through a communications interface of the apparatus;
acquiring, via the connection between the apparatus and the battery cell, a first current voltage value V0 of a battery cell;
when V0 is within a correction open-circuit voltage (OCV) section of the battery cell, acquiring, via the connection between the apparatus and the battery cell, a first state of charge (SOC) SOC0 and a first cumulative charge and discharge capacity Q0 corresponding to V0, wherein the correction OCV section comprises at least one of a non-attenuation OCV section and a non-hysteresis OCV section, an OCV of the battery cell is unaffected by battery aging in the non-attenuation OCV section, and an OCV of the battery cell is unaffected by a hysteresis effect in the non-hysteresis OCV section;
acquiring, via the connection between the apparatus and the battery cell, a second current voltage value V1 of the battery cell;
when V1 is within the correction OCV section of the battery cell, acquiring, via the connection between the apparatus and the battery cell, a second state of charge SOC1 and a second cumulative charge and discharge capacity Q1 corresponding to V1;
acquiring, via the connection between the apparatus and the battery cell, a current SOH correction value of the battery cell based on a ratio of a variation between Q0 and Q1 to a variation between SOC0 and SOC1; and
updating a SOH output value of the battery cell by using the current SOH correction value of the battery cell.