公开(公告)号：US20230006307A1

公开(公告)日：2023-01-05

申请号：US17900644

申请日：2022-08-31

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Xinzhi ZHANG ,  Yaoming DENG ,  Yunlei GAO ,  Dongfang YANG ,  Fan XU ,  Fengchao XIE ,  Zhengjie LI

IPC: H01M50/417 ,  H01M10/0525 ,  H01M50/449 ,  H01M50/403

Abstract: Embodiments of this application provide a battery separator, including a polyolefin-based porous separator, where the polyolefin-based porous separator includes polyethylene resin, an elongation rate of the polyolefin-based porous separator in an MD direction is greater than 120%, an elongation rate in a TD direction is greater than 120%, and for the polyolefin-based porous separator, crystallinity at a first-time temperature rise of polyethylene that is measured by using a differential scanning calorimeter is less than 65%, crystallinity at a second-time temperature rise is less than 55%, and a difference between the crystallinity at the first-time temperature rise and the crystallinity at the second-time temperature rise is less than 12%. The battery separator features a high elongation rate and a low temperature of closing a pore.

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.