公开(公告)号：US20230087876A1

公开(公告)日：2023-03-23

申请号：US18051008

申请日：2022-10-30

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yuanyuan LI ,  Rui SHEN ,  Libing HE

IPC: H01M4/583 ,  H01M4/04 ,  H01M10/0525

Abstract: A composite artificial graphite includes a first graphite and a second graphite. The first graphite includes secondary particles and has a graphite interlayer spacing d002 of 0.33560 nm to 0.33610 nm. The second graphite includes primary particles and has a graphite interlayer spacing d002 of 0.33620 nm to 0.33670 nm. A mass percentage of the first graphite in the composite artificial graphite is 40% to 90%.

公开(公告)号：US20220328831A1

公开(公告)日：2022-10-13

申请号：US17853229

申请日：2022-06-29

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Erling LI ,  Meng KANG ,  Baida DENG ,  Libing HE

IPC: H01M4/583 ,  H01M4/62 ,  H01M4/36

Abstract: A secondary battery, a preparation method thereof, and an apparatus including the secondary battery are described. Specifically, the secondary battery includes a negative-electrode plate, where the negative-electrode plate is of a multi-layer structure, and the multi-layer structure sequentially includes: a negative-electrode current collector, a primer layer, and a negative-electrode film layer; the negative-electrode film layer includes a first negative-electrode film layer and a second negative-electrode film layer, and the first negative-electrode film layer is located between the primer layer and the second negative-electrode film layer; and the first negative-electrode film layer includes a first negative-electrode active material, the first negative-electrode active material includes first artificial graphite, at least some particles in the first artificial graphite are secondary particles, and a quantity proportion A of the number of the secondary particles to a total number of particles of the first negative-electrode active material satisfies A≥50%.

公开(公告)号：US20210336244A1

公开(公告)日：2021-10-28

申请号：US17056958

申请日：2019-12-06

Applicant: Contemporary Amperex Technology Co., Limited

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

IPC: H01M4/133 ,  H01M4/36 ,  H01M4/583 ,  H01M4/139 ,  H01M4/38

Abstract: This application relates to a secondary battery and an apparatus including the secondary battery. Specifically, the secondary battery of this application includes a negative electrode plate, where the negative electrode plate includes a negative current collector and negative film layers where the negative film layers include a first negative film layer and a second negative film layer, the first negative film layer is disposed on at least one surface of the negative current collector and includes a first negative active material, and the second negative film layer is disposed on the first negative film layer and includes a second negative active material; the first negative active material includes natural graphite, and the second negative active material includes artificial graphite; the first negative active material satisties 4.0≤COI1≤7.0; and the second negative active material satisties 2.2≤COI2≤4.2.

公开(公告)号：US20210111399A1

公开(公告)日：2021-04-15

申请号：US17130787

申请日：2020-12-22

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Jianjun MA ,  Libing HE

IPC: H01M4/36 ,  H01M10/0525 ,  H01M4/587 ,  H01M4/133

Abstract: This application provides a negative electrode plate, a secondary battery, a battery module, a battery pack, and an apparatus. The negative electrode plate includes a negative current collector and a plurality of active substance layers formed on the negative current collector, where the plurality of active substance layers include at least a first active substance layer and a second active substance layer; the first active substance layer includes a first negative active substance, and the second active substance layer includes a second negative active substance; a ratio of thickness of the negative active substance of the first active substance layer to average particle size of the first negative active substance is 2.0 to 4.0; and a ratio of thickness of the second active substance layer to average particle size of the second negative active substance is 2.2 to 5.0.

公开(公告)号：US20200067125A1

公开(公告)日：2020-02-27

申请号：US16282537

申请日：2019-02-22

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Yuliang SHEN ,  Meng KANG ,  Jiazheng WANG ,  Libing HE

IPC: H01M10/04 ,  H01M4/04

Abstract: The present application relates to a negative electrode plate and a secondary battery. Specifically, the present application provides a negative electrode plate comprising a negative electrode current collector and an negative electrode film coated on at least one surface of the negative electrode current collector and containing the negative active material, wherein the negative electrode plate satisfies 0.60.7×P×(D90-D10)/D5O+B/38.0 wherein P refers to the porosity of the negative electrode film; B refers to the active specific surface area of the negative electrode film, and the unit thereof is m2/g; D10 refers to the particle size corresponding to the cumulative volume percentage of the negative active material reaching 10%, D90 refers to the particle size corresponding to the cumulative volume percentage of the negative active material reaching 90%, and D50 refers to the particle size corresponding to the cumulative volume percentage of the negative active material reaching 50%.

公开(公告)号：US20190334160A1

公开(公告)日：2019-10-31

申请号：US16389752

申请日：2019-04-19

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Meng KANG ,  Tianquan PENG ,  Yuliang SHEN ,  Jiazheng WANG ,  Libing HE

IPC: H01M4/133 ,  H01M10/058 ,  H01M10/0525

Abstract: The present disclosure provides a secondary battery, the secondary battery comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte, the negative electrode plate comprises a negative current collector and a negative film, the negative film is provided on at least one surface of the negative current collector and comprises a negative active material. The secondary battery satisfies relationships 3.9≤G×3.5+2.8/CB≤6.2 and 1.23≤0.55/VOI+CB×1.2≤2.80 at the same time. The battery of the present disclosure has the characteristics of high energy density and excellent dynamics performance, and the battery of the present disclosure also has the characteristic of long cycle life while charged under a large rate and a fast speed.