公开(公告)号：US20250023058A1

公开(公告)日：2025-01-16

申请号：US18901099

申请日：2024-09-30

Applicant: Ningde Amperex Technology Limited

Inventor： Dongdong HAN ,  Qingwen ZHANG ,  Xiaoqian LIU

IPC: H01M4/66 ,  H01M4/36 ,  H01M4/62 ,  H01M10/0525 ,  H01M10/0587 ,  H01M10/42

Abstract: An electrochemical device, including a positive electrode, where the positive electrode includes a positive electrode current collector, a first protective layer, and a first positive electrode active material layer. The positive electrode current collector includes a first surface and a second surface opposite to each other, and the first protective layer is disposed between the first surface and the first positive electrode active material layer. The first surface includes a first region and a second region, where the first region is provided with the first positive electrode active material layer, and the second region is not provided with the first positive electrode active material layer. An area of the first region is A1 cm2, an area of the second region is A2 cm2, and an area of the first protective layer is A3 cm2, satisfying: 0.5≤A3/(A1+A2)≤1. The electrochemical device of this application has significantly improved safety performance.

公开(公告)号：US20250125360A1

公开(公告)日：2025-04-17

申请号：US18988948

申请日：2024-12-20

Applicant: Ningde Amperex Technology Limited

Inventor： Xiaoqian LIU

IPC: H01M4/62 ,  H01M4/02 ,  H01M4/36 ,  H01M10/0587

Abstract: An electrochemical apparatus, including a positive electrode sheet, where the positive electrode sheet includes a positive electrode current collector, a first safety layer, and a first positive electrode active material layer. The positive electrode sheet includes a first region provided with the first positive electrode active material layer. The first safety layer includes a first part located in the first region. The first part is disposed between the positive electrode current collector and the first positive electrode active material layer. When the electrochemical apparatus is in a fully charged state at 25° C., a variation coefficient δ1 of a resistance R in the first region of the positive electrode sheet is ≤15%. The electrochemical apparatus can have good low-temperature performance while the safety performance of the electrochemical apparatus is met.