公开(公告)号：US11762028B2

公开(公告)日：2023-09-19

申请号：US17669486

申请日：2022-02-11

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Chaitanya Sankavaram ,  Garrett Michael Seeman ,  Zining Zhang ,  Calvin Wang

IPC: G01R31/389 ,  G01R31/396 ,  B60L58/12 ,  G01R31/374 ,  G01R31/3842

CPC classification number: G01R31/389 ,  B60L58/12 ,  G01R31/374 ,  G01R31/3842 ,  G01R31/396

Abstract: A current measuring circuit measures a charging current of a battery comprising a plurality of cell groups while the battery is being charged using one of a plurality of charging systems. A voltage measuring circuit measures voltages of the cell groups. A controller defines a plurality operating regions in a charging current profile of the battery during a charging cycle, filters the charging current and the voltages measured in the operating regions, calculates internal resistances of the cell groups in the operating regions based on the filtered current and voltages, generates at least one of statistical values and distance metrics based on the internal resistances of the cell groups, and determines whether one or more of the cell groups is faulty based on the at least one of the statistical values and the distance metrics irrespective of the plurality of charging systems used to charge the battery.

公开(公告)号：US12210067B2

公开(公告)日：2025-01-28

申请号：US17516223

申请日：2021-11-01

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Chaitanya Sankavaram ,  Calvin Wang ,  Ciro A. Spigno ,  Garrett Michael Seeman

IPC: G01R31/392 ,  B60L58/10 ,  G01R31/3842 ,  G01R31/389

Abstract: A system for monitoring a battery of a vehicle includes a current measuring circuit to measure a current of the battery comprising a plurality of cell groups connected to each other. A voltage measuring circuit is to measure voltages of the cell groups. A controller is configured to define a plurality operating regions in a current profile of the battery during a drive cycle of the vehicle. The controller is configured to filter the current and the voltages measured in the operating regions and calculate internal resistances of the cell groups in the operating regions based on the filtered current and voltages. The controller is configured to generate statistical values based on the internal resistances of the cell groups and determine whether one or more of the cell groups is faulty based on differences between maximum and minimum values of one of the statistical values across the cell groups.