公开(公告)号：US20220102701A1

公开(公告)日：2022-03-31

申请号：US17547291

申请日：2021-12-10

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Meng KANG ,  Jiazheng Wang ,  Xiaobin Dong ,  Libing He

IPC: H01M4/133 ,  H01M4/139 ,  H01M4/583 ,  H01M10/0585 ,  H01M50/209 ,  H01M10/0525

Abstract: The present application relates to a secondary battery, a process for preparing the same and an apparatus containing the secondary battery. Particularly, the secondary battery comprises a negative electrode plate, wherein the negative electrode plate comprises a negative electrode current collector and a negative electrode film, and the negative electrode film comprises a first negative electrode film and a second negative electrode film; the first negative electrode film is disposed on at least one surface of the negative electrode current collector and comprises a first negative electrode active material; and the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material; the first and second negative electrode active materials both comprise artificial graphite; the first negative electrode active material comprises primary particles, and a number percentage of the primary particles in the first negative electrode active material A satisfies A≥50%.

公开(公告)号：US20230253562A1

公开(公告)日：2023-08-10

申请号：US18129083

申请日：2023-03-31

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Meng KANG ,  Jiazheng WANG ,  Xiaobin Dong ,  Libing HE

IPC: H01M4/583 ,  H01M4/04 ,  H01M4/133 ,  H01M4/1393

CPC classification number: H01M4/583 ,  H01M4/04 ,  H01M4/133 ,  H01M4/1393 ,  H01M2004/021

Abstract: This application relates to a secondary battery, a process for preparing the same and an apparatus containing the secondary battery. In particular, the negative electrode plate comprises a negative current collector and a negative electrode film, wherein the negative electrode film comprises a first negative electrode film and a second negative electrode film, the first negative electrode film is comprises a first negative electrode active material, and the particle size uniformity of the first negative electrode active material is from 0.4 to 0.6; the second negative electrode film comprises a second negative electrode active material, and the particle size uniformity of the second negative electrode active material is from 0.25 to 0.45, and a ratio of the particle size uniformity of the first negative electrode active material to the particle size uniformity of the second negative electrode active material is from 1.05 to 1.9.

公开(公告)号：US11569498B2

公开(公告)日：2023-01-31

申请号：US17547264

申请日：2021-12-10

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Jiazheng Wang ,  Xiaobin Dong ,  Libing He

IPC: H01M4/36 ,  C01B32/205 ,  C01B32/05 ,  H01M4/133 ,  H01M4/02

Abstract: The present application discloses a negative electrode active material and a method for preparation thereof, a secondary battery, and an apparatus including the secondary battery. The negative electrode active material includes a core and a coating layer covering a surface of the core, the core includes artificial graphite, the coating layer includes amorphous carbon, the negative electrode active material has a surface area average particle size D(3,2) denoted as A, the negative electrode active material has a surface area average particle size D(3,2) denoted as B after powder compaction under a pressure of 20 kN, and the negative electrode active material satisfies: 72%≤B/A×100%≤82%.

公开(公告)号：US20220336845A1

公开(公告)日：2022-10-20

申请号：US17810646

申请日：2022-07-05

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Xiaobin Dong ,  Jiazheng Wang ,  Meng Kang ,  Libing He

IPC: H01M10/0525 ,  H01M4/04 ,  H01M4/587 ,  H01M4/66

Abstract: Embodiments provide a secondary battery and an apparatus containing the secondary battery. The secondary battery includes a negative electrode plate. The negative electrode plate includes a copper-based current collector and a negative electrode film layer disposed on at least one surface of the copper-based current collector and including a negative electrode active material, and the negative electrode active material includes graphite. The negative electrode plate satisfies Tx≥25, where Tx is as defined in the specification.

公开(公告)号：US20220102788A1

公开(公告)日：2022-03-31

申请号：US17544944

申请日：2021-12-08

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Xiaobin Dong ,  Jiazheng Wang ,  Meng Kang ,  Libing He

IPC: H01M50/103 ,  H01M4/587

Abstract: This application discloses a secondary battery and an apparatus containing the secondary battery. The secondary battery secondary battery includes an electrode assembly including a cell and tabs extending from the cell, the cell includes a negative electrode plate, the negative electrode plate includes a negative current collector and a negative electrode film arranged on at least one surfaces of the negative current collector and including a negative active material, wherein the negative active material includes artificial graphite including secondary particles; and the cell satisfies 5 cm≤0.5×√{square root over (a2+b2)}≤15 cm, and a≤15 cm, wherein a is the maximum size of the cell in the direction that the tabs extend, in cm; and b is the maximum size of the cell in a direction perpendicularly intersecting with the direction that the tabs extend, in cm.

公开(公告)号：US11237215B2

公开(公告)日：2022-02-01

申请号：US16816230

申请日：2020-03-11

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Jiazheng Wang ,  Meng Kang ,  Xiaobin Dong ,  Yuliang Shen ,  Libing He

IPC: G01R31/367 ,  G01R31/385 ,  H01M10/42 ,  H01M4/02

Abstract: The present application provides a method for determining fast charge performance of a negative electrode plate and a method for designing a negative electrode plate. By utilizing the method(s) according to the present application, the charging speed of a negative electrode plate can be quickly evaluated and the design period of a negative electrode plate in a fast charge battery can be greatly shortened.

公开(公告)号：US20210055349A1

公开(公告)日：2021-02-25

申请号：US16816230

申请日：2020-03-11

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Jiazheng Wang ,  Meng Kang ,  Xiaobin Dong ,  Yuliang Shen ,  Libing He

IPC: G01R31/367 ,  H01M10/42 ,  G01R31/385

Abstract: The present application provides a method for determining fast charge performance of a negative electrode plate and a method for designing a negative electrode plate. By utilizing the method(s) according to the present application, the charging speed of a negative electrode plate can be quickly evaluated and the design period of a negative electrode plate in a fast charge battery can be greatly shortened.

公开(公告)号：US20240313202A1

公开(公告)日：2024-09-19

申请号：US18669551

申请日：2024-05-21

Applicant: Contemporary Amperex Technology Co,. Limited

Inventor： Jiazheng WANG ,  Meng Kang ,  Xiaobin Dong ,  Yuliang Shen ,  Libing He

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/133 ,  H01M4/1393 ,  H01M4/587

CPC classification number: H01M4/366 ,  H01M4/133 ,  H01M4/1393 ,  H01M4/587 ,  H01M2004/021 ,  H01M2004/027 ,  H01M2220/20

Abstract: The present application relates to a secondary battery, a process for preparing the same and an apparatus containing the same. In particular, the secondary battery comprises a negative electrode plate, and the negative electrode plate comprises a negative current collector and a negative electrode film, wherein the negative electrode film comprises a first negative electrode film and a second negative electrode film, the first negative electrode film is disposed on at least one surface of the negative current collector and comprises a first negative electrode active material; the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material, and the second negative electrode active material comprises secondary particles, a number percentage of which is greater than or equal to 20%, wherein the first negative electrode active material comprises natural graphite and the second negative electrode active material comprises artificial graphite.

公开(公告)号：US12027695B2

公开(公告)日：2024-07-02

申请号：US17566713

申请日：2021-12-31

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Jiazheng Wang ,  Meng Kang ,  Xiaobin Dong ,  Yuliang Shen ,  Libing He

IPC: H01M4/36 ,  H01M4/133 ,  H01M4/1393 ,  H01M4/587 ,  H01M4/02

CPC classification number: H01M4/366 ,  H01M4/133 ,  H01M4/1393 ,  H01M4/587 ,  H01M2004/021 ,  H01M2004/027 ,  H01M2220/20

Abstract: The present application relates to a secondary battery, a process for preparing the same and an apparatus containing the secondary battery. In particular, the secondary battery comprises a negative electrode plate, and the negative electrode plate comprises a negative current collector and a negative electrode film, wherein the negative electrode film comprises a first negative electrode film and a second negative electrode film, the first negative electrode film is disposed on at least one surface of the negative current collector and comprises a first negative electrode active material, the first negative electrode active material comprises graphite; the second negative electrode film is disposed on the first negative electrode film and comprises a second negative electrode active material, the second negative electrode active material comprises artificial graphite, and the second negative electrode active material comprises secondary particles, the number percentage of which is greater than or equal to 20%.

公开(公告)号：US20240170659A1

公开(公告)日：2024-05-23

申请号：US18430676

申请日：2024-02-02

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Jiazheng Wang ,  Qingwei Yan ,  Liangbin Liu ,  Xiaobin Dong ,  Zijian Lv

IPC: H01M4/48 ,  H01M4/133 ,  H01M4/139 ,  H01M4/36 ,  H01M4/587 ,  H01M4/62 ,  H01M4/02

CPC classification number: H01M4/483 ,  H01M4/133 ,  H01M4/139 ,  H01M4/366 ,  H01M4/587 ,  H01M4/622 ,  H01M4/625 ,  H01M2004/021 ,  H01M2004/027

Abstract: Provided is a negative electrode plate, comprising: a negative electrode current collector and a first negative electrode active material layer. The first negative electrode active material layer is arranged on at least one surface of the negative electrode current collector, wherein, components of the first negative electrode active material layer comprise, by mass: 30%-70% of a silicon-based material, 15%-40% of a binder and 15%-40% of a conductive agent.