公开(公告)号：EP4376202A1

公开(公告)日：2024-05-29

申请号：EP23744028.4

申请日：2023-04-25

申请人： Sinoma Lithium Battery Separator (Nanjing) Co., Ltd.

发明人： XUE, Shan ,  BAI, Yaozong ,  JIA, Guozhong ,  LIU, Zhigang ,  ZHENG, Lei ,  DONG, Qiuchun ,  XUE, Yunqing ,  MA, Yuan ,  WU, Qiyang ,  MENG, Xianggan ,  ZHANG, Xujie ,  LIU, Gaojun

IPC分类号： H01M50/417 ,  H01M50/403

摘要： The present disclosure relates to the technical field of separators for electrochemical devices, and discloses a polyolefin porous film and a preparation method therefor, a battery separator, and an electrochemical device. The polyolefin porous film of the present disclosure has a network fiber structure, and when observed in a 20,000×SEM image, and the polyolefin porous film has the following characteristics: (1) within a circle having a radius of 1000 nm, a fiber orientation result R_MD of fibers having a fiber diameter of greater than 15 nm in a machine direction (MD) satisfies: (R_MD)2