公开(公告)号：US20210218113A1

公开(公告)日：2021-07-15

申请号：US16967398

申请日：2019-01-31

Applicant: BYD COMPANY LIMITED

Inventor： Lina JIN ,  Bowen XUAN ,  Xiaodong CAO ,  Jinxiang WU ,  Jun SHAN ,  Gang HU ,  Long HE

IPC: H01M50/457 ,  H01M50/403 ,  H01M50/446 ,  H01M50/451 ,  H01M50/414 ,  H01M50/434

Abstract: The present disclosure provides a polymer separator and preparation method thereof, and a lithium-ion battery including the polymer separator and preparation method thereof. The polymer separator includes a porous substrate, a hydrophilic blocking layer, and a porous polar polymer bonding layer. The hydrophilic blocking layer is disposed between the porous substrate and the porous polar polymer bonding layer. Pore walls in the porous polar polymer bonding layer are provided with node structures.

公开(公告)号：US20210280946A1

公开(公告)日：2021-09-09

申请号：US16319602

申请日：2017-08-15

Applicant: BYD COMPANY LIMITED

Inventor： Lina JIN ,  Jun SHAN ,  Gang HU ,  Long HE

IPC: H01M50/451 ,  H01M50/403 ,  H01M10/0525

Abstract: The present disclosure relates to the field of lithium-ion batteries, and discloses a battery separator and a lithium-ion battery, and preparation methods thereof. The battery separator includes a porous base membrane and a bonding layer attached to at least one side surface of the porous base membrane, wherein the bonding layer contains an acrylate crosslinked polymer and a styrene-acrylate crosslinked copolymer and/or a vinylidene fluoride-hexafluoropropylene copolymer, and the porosity of the bonding layer is 40-65%.