公开(公告)号：US11340277B2

公开(公告)日：2022-05-24

申请号：US16992578

申请日：2020-08-13

Applicant: DENSO CORPORATION

Inventor： Nobuo Yamamoto ,  Ichiro Yamada ,  Shuhei Yoshida ,  Masaya Nakamura ,  Takehiko Yamaki ,  Hiroyasu Suzuki ,  Katsuki Hayashi

IPC: G01R27/26 ,  G01R31/389 ,  G01R31/388

Abstract: An abnormality determination device for a secondary battery includes an internal-resistance calculation unit, a threshold memory unit, a capacity balance comparison unit, and an abnormality determination unit. The internal-resistance calculation unit detects an internal resistance in a negative-electrode reaction resistance dominant region in which a reaction resistance of a negative electrode is dominant in a charge and discharge reaction of the secondary battery. The threshold memory unit stores a capacity balance threshold used as a reference for determining abnormality in a balance between a capacity of a positive electrode and a capacity of the negative electrode in the secondary battery. The capacity balance comparison unit compares the internal resistance calculated by the internal-resistance calculation unit with the capacity balance threshold stored in the threshold memory unit. The abnormality determination unit determines abnormality in capacity balance in the secondary battery based on a comparison result from the capacity balance comparison unit.