公开(公告)号：US20210208201A1

公开(公告)日：2021-07-08

申请号：US17207249

申请日：2021-03-19

Applicant: DENSO CORPORATION

Inventor： Isao ISHIBE ,  Syunya YAMAMOTO

IPC: G01R31/3835 ,  H02J7/00 ,  G01R31/396 ,  H01M10/48

Abstract: In a battery monitoring device, a plurality of short-circuit switches are correspondingly provided for a plurality of battery cells of an assembled battery through detection lines. The battery cells includes a first battery cell and a second battery cell adjacent to each other. The short-circuit switches includes a first switch and a second switch, respectively, corresponding to the first battery cell and the second battery cell. An abnormality determination circuit executes an on and off control to turn the second switch from an off state to an on state, and then to the off state again while keeping the first switch in an off state. The abnormality determination circuit determines an abnormality of a detection line based on detection voltages of the first battery cell and detection voltages of the second battery cell before and after execution of the on and off control.