US 12,255,486 B2
Charging of a battery cell
Jan Philipp Schmidt, Holzmaden (DE); and Johannes Wandt, Munich (DE)
Assigned to Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Appl. No. 17/640,153
Filed by Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
PCT Filed Aug. 14, 2020, PCT No. PCT/EP2020/072837
§ 371(c)(1), (2) Date Mar. 3, 2022,
PCT Pub. No. WO2021/043563, PCT Pub. Date Mar. 11, 2021.
Claims priority of application No. 10 2019 123 739.4 (DE), filed on Sep. 4, 2019.
Prior Publication US 2022/0311262 A1, Sep. 29, 2022
Int. Cl. H02J 7/00 (2006.01); H01M 10/052 (2010.01); H01M 10/44 (2006.01); B60L 53/62 (2019.01)
CPC H02J 7/007182 (2020.01) [H01M 10/052 (2013.01); H01M 10/44 (2013.01); H01M 10/441 (2013.01); H02J 7/0047 (2013.01); H02J 7/0063 (2013.01); H02J 7/00711 (2020.01); B60L 53/62 (2019.02)] 18 Claims
OG exemplary drawing
 
1. A method for charging a battery cell in charging phases, the method comprising:
during a charging phase with a charging current that is at least approximately constant, performing monitoring to determine whether a charging voltage applied to the battery cell reaches or exceeds a predefined changeover voltage and, if the charging voltage applied to the battery cell reaches or exceeds the predefined changeover voltage, performing a changeover to a next charging phase with a lower charging current that is at least approximately constant, and
during each charging phase of the charging phases, performing additional monitoring to determine whether a predefined difference between the charging voltage and a respective changeover voltage of the charging phase is reached or fallen below, and, if the predefined difference between the charging voltage and the respective changeover voltage of the charging phase is reached or fallen below, applying at least one discharge pulse to the battery cell,
wherein during a charging phase of the charging phases, after the at least one discharge pulse has been applied, if the predefined difference between the charging voltage and the respective changeover voltage is reached again, another discharge pulse is not applied, and if the charging voltage has increased by a predefined additional-voltage value after the predefined difference has been reached, another discharge pulse is applied.