公开(公告)号：US12282069B2

公开(公告)日：2025-04-22

申请号：US17647962

申请日：2022-01-13

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Yue-Yun Wang ,  Steven Earl Muldoon ,  Lei Hao ,  Michael P Barker

IPC: G01R31/392 ,  H01M10/48

Abstract: Systems and methods for diagnosing health of a battery using in-vehicle impedance analysis. The method includes receiving a sensed current measurement for a cell of the battery; generating a current profile as a function of the sensed current measurement, including pulses to a peak current, the pulses having a pulse frequency (w); applying a current with the current profile to the cell; for each pulse in the current profile, receiving a voltage measurement for the cell that is responsive to the pulse, calculating an impedance for the cell responsive thereto, the impedance comprising a real component at the pulse frequency (RZw), and an imaginary component at the pulse frequency (IZw), identifying a battery health problem when either RZw exceeds a preprogrammed first threshold for the pulse frequency, or when IZw exceeds a preprogrammed second threshold for the pulse frequency, and storing the RZw and the IZw for the cell.