公开(公告)号：US20220123436A1

公开(公告)日：2022-04-21

申请号：US17565499

申请日：2021-12-30

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Wei LI ,  Chao JIN ,  Haihao SHI ,  Qian LI

IPC: H01M50/454 ,  H01M10/0525 ,  H01M50/417 ,  H01M50/403

Abstract: The present embodiments provide a separator, a process for preparing the same, a lithium ion secondary battery, a battery module, a battery pack and an apparatus. The separator provided by the present application comprises a porous base film and a functional coating disposed on at least one surface of the porous base film, wherein the functional coating comprises polyimide nanosheets, and the polyimide nanosheets are stacked irregularly to form a lamellar loose structure; and a thickness ratio of the functional coating to the porous base film is from 0.1 to 1.0. The present application also provides a process for preparing the separator, and a lithium ion secondary battery and an apparatus comprising the separator.

公开(公告)号：US20200161640A1

公开(公告)日：2020-05-21

申请号：US16422872

申请日：2019-05-24

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Wei LI ,  Haihao SHI ,  Huihui LIU ,  Chao JIN ,  Tianyi GAO ,  Jianbao XU ,  Shisong LI ,  Chao GUO

IPC: H01M4/36 ,  H01M4/62

Abstract: The present invention relates to a battery, comprising a positive electrode plate, a separator and a negative electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and at least two layers of positive active materials on at least one surface of the positive electrode current collector in which the underlying positive active material layer in contact with the positive electrode current collector comprises a first positive active material, a first polymer material, and a first conductive material and in which the upper positive active material layer comprises a second positive active material, a second polymer material, and a second conductive material and the first polymer material comprises an oil-dispersible polymer material having a solubility in NMP at 130° C. for 5 minutes, which is 30% or less of the solubility of PVDF under the same conditions. The battery exhibits good safety performance and improved electrical performance.