US 12,294,062 B2
Battery system and method for equalization of battery pack
Hiroshi Yoshida, Anjo (JP); Takahiko Nakagawa, Seto (JP); and Kenta Uwai, Shibuya-ku Tokyo-to (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP); and SUBARU CORPORATION, Tokyo (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP); and SUBARU CORPORATION, Tokyo (JP)
Filed on Mar. 18, 2022, as Appl. No. 17/698,396.
Claims priority of application No. 2021-048041 (JP), filed on Mar. 23, 2021.
Prior Publication US 2022/0311058 A1, Sep. 29, 2022
Int. Cl. H02J 7/00 (2006.01); B60L 58/22 (2019.01); H01M 10/42 (2006.01); H02J 7/14 (2006.01)
CPC H01M 10/425 (2013.01) [B60L 58/22 (2019.02); H02J 7/0019 (2013.01); H02J 7/1423 (2013.01); B60L 2240/547 (2013.01); H01M 2010/4271 (2013.01); H01M 2220/20 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A battery system comprising:
a battery pack including a plurality of blocks connected in series;
an equalizer that executes equalization control to equalize the plurality of blocks in voltage;
a controller that obtains a determined equalization time and controls the equalizer to end the equalization control when the equalization time has elapsed since the equalization control was started; and
a voltage sensor that senses a voltage of each of the plurality of blocks,
wherein the equalizer includes:
a plurality of switching elements each connected to a respective one of the plurality of blocks in parallel, and
a plurality of discharge resistors each connected to a respective one of the plurality of switching elements in series, and
wherein the equalization time is determined based on a resistance of the plurality of discharge resistors and a detection error of the voltage sensor.