公开(公告)号：EP4343953A1

公开(公告)日：2024-03-27

申请号：EP22845195.1

申请日：2022-07-13

Applicant: BYD Company Limited

Inventor： RONG, Liangbin ,  PAN, Qiu ,  WANG, Xinyue ,  CHENG, Han ,  YUAN, Wansong

IPC: H01M50/528 ,  H01M50/533 ,  H01M50/536 ,  H01M50/538 ,  H01M10/04

Abstract: The present disclosure discloses a cylindrical battery, which includes a casing, having an accommodating space; and a negative electrode sheet, a first separator, a positive electrode sheet and a second separator that are wound multiple turns to define an electrode core. The casing is co-axial with the electrode core. The electrode core is at least partially received in the accommodating space. The positive electrode sheet includes a positive electrode material layer and a positive electrode foil layer. The negative electrode sheet includes a negative electrode material layer and a negative electrode foil layer. At least some of the wound turns of the electrode foil layer extends toward one end of the casing to form a positive electrode tab. At least some of the wound turns of the negative electrode foil layer extends toward the other end of the casing to form the negative electrode tab. As a result, a portion of the positive electrode end surface of the electrode core that is not covered by the positive electrode tab is located at at least a side of the positive electrode tab, and a portion of the negative electrode end surface of the electrode core that is not covered by the negative electrode tab is located at at least a side of the negative electrode tab.