公开(公告)号：US20230163417A1

公开(公告)日：2023-05-25

申请号：US18145749

申请日：2022-12-22

Applicant: Huawei Technologies Co., Ltd.

Inventor： Zhengjie LI ,  Yaoming DENG ,  Xinzhi ZHANG ,  Yunlei GAO ,  Dongfang YANG ,  Da HONG ,  Fengchao XIE

IPC: H01M50/463 ,  H01M50/414 ,  H01M4/62

CPC classification number: H01M50/463 ,  H01M4/624 ,  H01M50/414

Abstract: This application provides a secondary battery, including at least one battery unit assembly. The battery cell assembly includes a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate. An elongation rate of the separator is greater than 100%, the elongation rate of the separator includes an elongation rate in the length direction and/or an elongation rate in the width direction, a ratio of the elongation rate of the separator to a thickness of the active material layer of the positive electrode plate and/or negative electrode plate is 3.0%/µm to 8.0%/µm, and a ratio of the elongation rate of the separator to an elongation rate of the current collector of the positive electrode plate and/or negative electrode plate is greater than or equal to 60.