公开(公告)号：US20240387802A1

公开(公告)日：2024-11-21

申请号：US18774953

申请日：2024-07-17

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Lianchuan Li ,  Rui Shen ,  Libing He

IPC: H01M4/36 ,  H01M4/02 ,  H01M4/04 ,  H01M4/587

Abstract: Provided are a negative electrode plate and a preparation method thereof, a battery cell, a battery, and an electrical device. The negative electrode plate includes a current collector and a film layer disposed on the current collector. The film layer includes a first part and a second part disposed along a thickness direction of the film layer. The first part is disposed on the current collector. The second part is disposed on the first part. The first part includes a first active material. The second part includes a second active material. The first active material includes a first carbon-based material. The second active material includes a second carbon-based material containing a coating layer. A powder compaction density of the first active material is greater than a powder compaction density of the second active material.

公开(公告)号：US11735775B2

公开(公告)日：2023-08-22

申请号：US17402672

申请日：2021-08-16

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Bin Jiang ,  Changlong Han ,  Chenghua Fu ,  Rui Shen ,  Yuanyuan Li

IPC: H01M10/0569 ,  H01M4/133 ,  H01M4/505 ,  H01M4/525 ,  H01M4/587 ,  H01M10/0567 ,  H01M4/02

CPC classification number: H01M10/0569 ,  H01M4/133 ,  H01M4/505 ,  H01M4/525 ,  H01M4/587 ,  H01M10/0567 ,  H01M2004/021 ,  H01M2004/027 ,  H01M2004/028 ,  H01M2220/20 ,  H01M2300/0037

Abstract: The present application provides a secondary battery, an electrolyte, and an apparatus including the secondary battery. The secondary battery of the present application includes an electrolyte, characterized in that the electrolyte includes an organic solvent, and the organic solvent includes a cyclic carbonate and a chain carbonate; the mass ratio of the cyclic carbonate and the chain carbonate is from 25:75 to 32:68; the chain carbonate includes dimethyl carbonate; the mass percentage of the dimethyl carbonate in the chain carbonate is greater than or equal to 9 wt % and less than 50 wt %; wherein based on the total mass of the organic solvent, the mass percentage of a carboxylic acid ester is less than 5 wt %. The secondary battery of the present application can simultaneously obtain excellent low-temperature power, long service life and cycle performance.

公开(公告)号：US20220123307A1

公开(公告)日：2022-04-21

申请号：US17402668

申请日：2021-08-16

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Yuanyuan Li ,  Jianjun Ma ,  Rui Shen ,  Libing He

IPC: H01M4/587 ,  H01M10/0525 ,  C01B32/205

Abstract: The present application discloses a secondary battery, an apparatus including the secondary battery, artificial graphite and a method for the preparation thereof. The secondary battery includes a negative electrode plate including a negative active material, wherein the negative active material includes an artificial graphite having a numerical particle size Dn10 of at least 1 μm; the artificial graphite has a graphitization degree of 90% to 95%; the negative electrode plate has a compaction density of 1.55 g/cm3 to 1.75 g/cm3, and the negative electrode plate has an OI value of at most 15, wherein the OI value of the negative electrode plate represents a ratio C004/C110, in which C004 is the peak area of the diffraction peak of 004 crystal plane of the artificial graphite in the negative electrode plate and C110 is the peak area of the diffraction peak of 110 crystal plane of the artificial graphite in the negative electrode plate.

公开(公告)号：US20220102723A1

公开(公告)日：2022-03-31

申请号：US17544964

申请日：2021-12-08

Applicant: Contemporary Amperex Technology Co. Limited

Inventor： Jianjun MA ,  Rui Shen ,  Libing He ,  Lei Chen ,  Baojian Zhu

IPC: H01M4/583 ,  H01M10/052 ,  H01M4/36 ,  H01M4/485 ,  H01M4/133 ,  H01M4/131

Abstract: This application discloses a secondary battery and an apparatus containing the secondary battery. The secondary battery comprises a positive electrode plate comprising a positive active material and a negative electrode plate comprising a negative active material. The negative active material comprises a first material and a second material, the first material comprises artificial graphite, and the second material comprises natural graphite. The positive active material comprises one or more of layered lithium transition metal oxides and modified compounds thereof, and a smoothness L of a surface of the negative electrode film away from the negative electrode current collector satisfies: 40≤L≤50; or the positive active material comprises one or more of lithium-containing phosphates with olivine structure and modified compounds thereof, and a smoothness L of a surface of the negative electrode film away from the negative electrode current collector satisfies: 45≤L≤55.

公开(公告)号：US20220102700A1

公开(公告)日：2022-03-31

申请号：US17547243

申请日：2021-12-10

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Jianjun MA ,  Libing He ,  Rui Shen

IPC: H01M4/133 ,  H01M4/1393 ,  H01M4/587 ,  H01M4/131 ,  H01M4/525 ,  H01M10/0525 ,  H01M10/0585

Abstract: This application discloses a secondary battery, and a battery module, a battery pack and an apparatus containing the secondary battery. The secondary battery has a positive and negative electrodes having specific positive and negative active materials respectively, such that the secondary battery may have improved dynamic performance and at the same time have better cycle performance at high temperature and safety performance.

公开(公告)号：US11450842B2

公开(公告)日：2022-09-20

申请号：US17541297

申请日：2021-12-03

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Jianjun Ma ,  Rui Shen ,  Libing He

IPC: H01M4/133 ,  H01M4/1393 ,  H01M4/505 ,  H01M4/525 ,  H01M4/62 ,  H01M10/0525 ,  H01M10/0585 ,  H01M4/02

Abstract: The present application relates to a secondary battery, a method for manufacturing the same and an apparatus containing the same. Specifically, in the secondary battery the first negative electrode film comprises a first negative electrode active material, the second negative electrode film comprises a second negative electrode active material. The first negative electrode active material comprises natural graphite and satisfies: 6 mΩ·cm≤A≤12 mΩ·cm, the second negative electrode active material comprises artificial graphite and satisfies: 13 mΩ·cm≤B≤20 mΩ·cm, A is a powder resistivity of the first negative electrode active material tested at a pressure of 8 Mpa, and B is a powder resistivity of the second negative electrode active material tested at a pressure of 8 Mpa. The secondary battery of the present application can have better kinetic performance and longer cycle life while maintaining higher energy density.

公开(公告)号：US11417869B2

公开(公告)日：2022-08-16

申请号：US17013734

申请日：2020-09-07

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Rui Shen ,  Jianjun Ma ,  Libing He

IPC: H01M4/133 ,  H01M10/0525 ,  H01M4/525 ,  H01M4/583 ,  H01M4/485 ,  H01M4/62 ,  H01M4/505 ,  H01M4/587 ,  H01M4/02 ,  H01M4/131

Abstract: The present application relates to a lithium ion secondary battery comprising a cathode, an anode, a separator and an electrolyte; wherein the cathode comprises a positive current collector and a positive material layer, wherein the positive material layer comprises a positive active material with a formula LixNiaCobMcO2, M is at least one selected from Mn and Al, 0.95x1.2, 0

公开(公告)号：US20220102710A1

公开(公告)日：2022-03-31

申请号：US17547271

申请日：2021-12-10

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Jianjun MA ,  Rui Shen ,  Libing He

IPC: H01M4/36 ,  H01M4/505 ,  H01M4/525 ,  H01M4/587 ,  H01M10/0525 ,  H01M4/04

Abstract: The present application relates to a secondary battery, a process for preparing the same and an apparatus containing the secondary battery. The negative electrode film of the secondary battery 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 negative electrode active material comprises natural graphite and the first negative electrode active material satisfies: 0.60≤S1≤0.85; and the second negative electrode active material comprises artificial graphite. The secondary battery according to the present application has both better low-temperature rate performance and longer high-temperature cycle life while having a higher energy density.

公开(公告)号：US20220093906A1

公开(公告)日：2022-03-24

申请号：US17541297

申请日：2021-12-03

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Jianjun Ma ,  Rui Shen ,  Libing He

IPC: H01M4/133 ,  H01M4/1393 ,  H01M10/0585 ,  H01M10/0525 ,  H01M4/62 ,  H01M4/505 ,  H01M4/525 ,  H01M4/02

Abstract: The present application relates to a secondary battery, a method for manufacturing the same and an apparatus containing the same. Specifically, in the secondary battery the first negative electrode film comprises a first negative electrode active material, the second negative electrode film comprises a second negative electrode active material. The first negative electrode active material comprises natural graphite and satisfies: 6 mΩ.cm≤A≤12 mΩ.cm, the second negative electrode active material comprises artificial graphite and satisfies: 13 mΩ.cm≤B≤20 mΩ.cm, A is a powder resistivity of the first negative electrode active material tested at a pressure of 8 Mpa, and B is a powder resistivity of the second negative electrode active material tested at a pressure of 8 Mpa. The secondary battery of the present application can have better kinetic performance and longer cycle life while maintaining higher energy density.

公开(公告)号：US12046753B2

公开(公告)日：2024-07-23

申请号：US17959188

申请日：2022-10-03

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yuanyuan Li ,  Rui Shen ,  Libing He

IPC: H01M4/583 ,  H01M4/02 ,  H01M4/04 ,  H01M10/0525

CPC classification number: H01M4/583 ,  H01M4/0435 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/027 ,  H01M2220/20

Abstract: This application provides a negative electrode plate, including an active layer 1 and an active layer 2. The active layer 1 contains an active material 1, and the active layer 2 contains an active material 2. A powder OI value of the active material 1 falls in a range of 8 to 32, and a powder OI value of the active material 2 falls in a range of 2 to 7. A gram capacity of the active material 1 falls in a range of 290 to 350 mAh/g, and a gram capacity of the active material 2 falls in a range of 350 to 368 mAh/g. A ratio α of the powder OI value between the active material 1 and the active material 2 falls in a range of 2.00 to 6.25.