公开(公告)号：US20220285957A1

公开(公告)日：2022-09-08

申请号：US17195305

申请日：2021-03-08

Applicant: Google LLC

Inventor： James Robert Lim ,  Michael Jonathon Chen ,  Mitchell Aaron Jones ,  William Alan Saperstein ,  David Wang

IPC: H02J7/00

Abstract: Techniques to detect faults in a battery with at least two parallel battery cells. In some examples, a cell may fail or become disconnected. The circuitry of this disclosure may determine whether a battery pack has a fault by measuring battery parameters at the positive and negative terminals. When the circuitry detects a fault, the circuitry may adjust the charge rate so that the charge does not exceed the maximum charge rate of any single cell of the battery pack. In some examples, the circuitry may shut off the charge current to the battery pack to ensure that the charge rate does not exceed the maximum charge rate of any single cell. To avoid false positive fault detection, the circuitry of this disclosure may verify the detected fault and the parameters of the charging cycle before reducing the charging current.