公开(公告)号：EP4199135A1

公开(公告)日：2023-06-21

申请号：EP21855121.6

申请日：2021-04-15

Applicant: BYD Company Limited

Inventor： CHEN, Kaixiang ,  XIE, Xiaodi ,  ZENG, Biao ,  YAN, Haipeng

IPC: H01M4/02 ,  H01M10/0525

Abstract: A negative electrode plate (100) is provided, which includes a current collector (10), and a first negative electrode active material layer (11) and a second negative electrode active material layer (12) sequentially arranged on the current collector (10). A tortuosity of the first negative electrode active material layer (12) and a tortuosity of the second negative electrode active material layer (11) satisfy: 1 1 ≤5,1 2 ≤5, and 0.5≤t 2 -t 1 ≤3.2; where t 1 represents the tortuosity of the first negative electrode active material layer (11), t 2 represents the tortuosity of the second negative electrode active material layer (12), and t 2 -t 1 represents a difference between the tortuosity of the second negative electrode active material layer (12) and the tortuosity of the first negative electrode active material layer (11).

公开(公告)号：EP4102630A1

公开(公告)日：2022-12-14

申请号：EP21757581.0

申请日：2021-02-07

Applicant: BYD Company Limited

Inventor： YUAN, Wansong ,  YAN, Haipeng ,  JIANG, Xi ,  ZOU, Xiangda ,  ZHU, Yan

IPC: H01M50/207

Abstract: A cell array (20), including a plurality of cells (10) arranged in sequence is provided. Each of the plurality of cells (10) includes a housing (100) and an electrode core (201). The electrode core (201) includes an electrode plate. The electrode plate includes a current collector and a coating layer arranged on the current collector. The cell array (20) satisfies the following formula 1: (1 - JR w ) + (SR w - 1) = 10%-15%. JR w is an expansion space for the electrode core (201) inside each of the plurality of cells (10) in a first direction, SR w is an expansion space outside the plurality of cells (10) in the first direction, and a thickness direction of each of the plurality of cells (10) is defined as the first direction. JR w = P w /(Cell w - K w - Cw). SR w = (M w -MN w )/(Cell n × Cell w ).