公开(公告)号：US20250132461A1

公开(公告)日：2025-04-24

申请号：US18832353

申请日：2022-12-20

Applicant: Huawei Technologies Co., Ltd.

Inventor： Dongfang Yang ,  Zhixian Li ,  Zemeng Sun ,  Fengchao Xie

IPC: H01M50/457 ,  H01M50/423 ,  H01M50/451 ,  H01M50/491

Abstract: A composite separator includes a base separator and a film covering a surface of the base separator, where the film is a porous film. The film includes a first material region, a second material region, and a third material region, and the second material region and the third material region are respectively disposed on two sides of the first material region, and both are connected to the first material region. A material of the first material region includes a polymer. Both a material of the second material region and a material of the third material region include inorganic particles, where a mass percentage of the inorganic particles in the second material region is 90% or more, and/or a mass percentage of the inorganic particles in the third material region is 90% or more.