公开(公告)号：US11444333B2

公开(公告)日：2022-09-13

申请号：US16423389

申请日：2019-05-28

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Qiang Zheng ,  Zhanzhao Fang ,  Qi Dang

IPC: H01M10/0587 ,  H01M10/0525 ,  H01M4/36 ,  H01M4/66 ,  H01M4/70

Abstract: The present application relates to an electrochemical device. Specifically, the present application provides an electrochemical device, including a cell and a shell enclosing the cell; the cell includes a jelly roll including a first electrode and a second electrode spaced from each other, a separator is disposed between the first electrode and the second electrode, the first electrode and the second electrode are wound to form the cell; the first electrode includes a first current collector, the first current collector includes a first surface and a second surface disposed oppositely; the first surface faces the shell, and includes a coated region coated with a first active material and an uncoated region; the uncoated region includes a first uncoated region disposed at an end of the jelly roll, and the first uncoated region includes alternating bent portions and straight portions; and the bent portions are provided with an insulating layer.

公开(公告)号：US11056900B2

公开(公告)日：2021-07-06

申请号：US16261187

申请日：2019-01-29

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Qi Dang ,  Chao Gao ,  Qiang Zheng ,  Zhanzhao Fang

IPC: H02J7/00

Abstract: A charging method is proposed to include the steps of: in a first stage of charging, charging a battery with a first-stage current until a voltage of the battery reaches a first-stage voltage value; and in a second stage of charging, charging the battery with a second-stage current until the voltage of the battery reaches a second-stage voltage value which is greater than the first-stage voltage value. The second-stage current is smaller than the first-stage current.

公开(公告)号：US12166213B2

公开(公告)日：2024-12-10

申请号：US16365449

申请日：2019-03-26

Applicant: NINGDE AMPEREX TECHNOLOGY LIMITED

Inventor： Qiang Zheng ,  Qi Dang ,  Zhanzhao Fang ,  Qiang Tao

IPC: H01M4/66 ,  H01M10/0587 ,  H01M50/449 ,  H01M50/534 ,  H01M50/536

Abstract: The present application relates to an electrode sheet, a battery cell and a battery. The electrode sheet includes a current collector and a protective layer. The current collector includes a coated region provided with an active material layer and an uncoated region without being provided with the active material layer. The protective layer is provided on at least a part of a surface of the uncoated region, and has a porosity of 0% to 95%. For the electrode sheet according to the present application, by providing the current collector with the protective layer, the contact resistance may be increased when the electrode sheet is short-circuited, and the discharge power and the thermal runaway probability of the battery cell may be reduced when the battery cell is internally short-circuited, thereby improving the safety performance of the battery cell.

公开(公告)号：US11978862B2

公开(公告)日：2024-05-07

申请号：US17874615

申请日：2022-07-27

Applicant: Ningde Amperex Technology Limited

Inventor： Qiang Zheng ,  Zhanzhao Fang ,  Qi Dang

IPC: H01M10/0587 ,  H01M4/36 ,  H01M4/66 ,  H01M4/70 ,  H01M10/0525

CPC classification number: H01M10/0587 ,  H01M4/366 ,  H01M4/667 ,  H01M4/70 ,  H01M10/0525

Abstract: An electrochemical device, including a cell and a shell enclosing the cell; the cell includes a jelly roll including a first electrode and a second electrode spaced from each other, a separator is disposed between the first electrode and the second electrode, the first electrode and the second electrode are wound to form the cell; the first electrode includes a first current collector, the first current collector includes a first surface and a second surface disposed oppositely; the first surface faces the shell, and includes a coated region coated with a first active material and an uncoated region; the uncoated region includes a first uncoated region disposed at an end of the jelly roll, and the first uncoated region includes alternating bent portions and straight portions; and the bent portions are provided with an insulating layer.