US 12,434,596 B2
Method for charging traction battery and battery management system
Shan Huang, Ningde (CN); Shichao Li, Ningde (CN); Haili Li, Ningde (CN); Wei Zhao, Ningde (CN); and Lan Xie, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on Aug. 30, 2023, as Appl. No. 18/458,164.
Application 18/458,164 is a continuation of application No. PCT/CN2021/117310, filed on Sep. 8, 2021.
Prior Publication US 2023/0398902 A1, Dec. 14, 2023
Int. Cl. B60L 58/16 (2019.01); B60L 53/62 (2019.01); B60L 58/12 (2019.01); B60L 58/13 (2019.01); G01R 31/367 (2019.01); H02J 7/00 (2006.01); G01R 31/392 (2019.01); H01M 10/42 (2006.01)
CPC B60L 58/16 (2019.02) [B60L 53/62 (2019.02); B60L 58/13 (2019.02); H02J 7/0029 (2013.01); H02J 7/005 (2020.01); H02J 7/0071 (2020.01); H02J 7/00714 (2020.01); B60L 58/12 (2019.02); B60L 2240/549 (2013.01); G01R 31/367 (2019.01); G01R 31/392 (2019.01); H01M 2010/4271 (2013.01); H02J 7/0048 (2020.01); H02J 7/0049 (2020.01)] 15 Claims
OG exemplary drawing
 
1. A method for charging a traction battery, applied to a battery management system BMS of the traction battery, wherein the method comprises:
obtaining a state of health SOH of the traction battery;
in a charging process of the traction battery, obtaining a state of charge SOC of the traction battery;
determining an SOC interval value corresponding to discharging or stopping being charged of the traction battery based on the SOH of the traction battery; and
when the SOC of the traction battery changes by the SOC interval value, controlling the traction battery to discharge or stop being charged,
the SOH is a ratio of a current available capacity to a nominal capacity of the traction battery, the SOC is a ratio of a current remaining capacity to the current available capacity of the traction battery,
the SOC interval value corresponding to the discharging or the stopping being charged of the traction battery is determined based on a mapping formula C %=k1×H %+b1, or C %=k2×(H %)2+b2, wherein the SOC interval value is represented by C %, the SOH is represented by H %, and k1, k2, b1, and b2 are preset constants,
the determining an SOC interval value corresponding to discharging or stopping being charged of the traction battery is based on the SOH of the traction battery and comprises:
comparing the SOH of the traction battery with a series of preset SOH thresholds comprising a first preset SOH threshold that is 100%, a second preset SOH threshold that is less than the first SOH threshold, and a third SOH threshold that is less than the second SOH threshold;
if the SOH of the traction battery is greater than or equal to the first preset SOH threshold, determining that the SOC interval value is a first SOC interval value, wherein the first SOC interval value is equal to a first preset SOC interval value corresponding to the first preset SOH threshold; and
if the SOH of the traction battery is less than the first preset SOH threshold and greater than or equal to the second SOH threshold, determining that the SOC interval value is a second SOC interval value, wherein the second SOC interval value is less than the first preset SOC interval value corresponding to the first preset SOH threshold and greater than a second preset SOC interval value corresponding to the second preset SOH threshold,
if the SOH of the traction battery is less than the second preset SOH threshold and greater than or equal to the third SOH threshold, determining that the SOC interval value is a third SOC interval value, wherein the third SOC interval value is less than the second SOC interval value and greater than or equal to a third preset SOC interval value corresponding to the third SOH threshold,
wherein the first SOC interval value is greater than the second SOC interval value.