公开(公告)号：US20240372067A1

公开(公告)日：2024-11-07

申请号：US18773844

申请日：2024-07-16

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Qifan WU ,  Xiaobin DONG ,  Ming ZHANG

IPC: H01M4/133 ,  H01M4/02 ,  H01M4/587 ,  H01M4/62 ,  H01M10/054

Abstract: The present application provides a negative electrode plate, a secondary battery, a battery module, a battery pack, and an electrical device. The negative electrode plate includes: a negative electrode current collector; and a negative electrode film layer which is located on at least one surface of the negative electrode current collector and includes first negative electrode active material particles and second negative electrode active material particles, the first negative electrode active material particles including a plurality of adsorption holes and having a tap density of 0.4 g/cm3-1.4 g/cm3, wherein a difference d in median particle size between the first negative electrode active material particles and the second negative electrode active material particles satisfies: 3 μm≤d≤19 μm, and a compaction density PD of the negative electrode film layer satisfies: 0.8 g/cm3≤PD≤1.4 g/cm3.

公开(公告)号：US20220102711A1

公开(公告)日：2022-03-31

申请号：US17547277

申请日：2021-12-10

Applicant: Contemporary Amperex Technology Co., Limited

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

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

Abstract: The present application discloses a negative electrode active material and a method for preparing the same, a secondary battery, and an apparatus including the secondary battery. The negative electrode active material includes a core and a coating layer covering the surface of the core, the core includes artificial graphite, the coating layer includes amorphous carbon, and the particle size uniformity of the negative electrode active material is from 0.25 to 0.45.

公开(公告)号：US20240391779A1

公开(公告)日：2024-11-28

申请号：US18795082

申请日：2024-08-05

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yuan LI ,  Xiaobin DONG ,  Zijian LV ,  Liangbin LIU ,  Jiazheng WANG

IPC: C01B32/05

Abstract: A silicon carbon composite material includes a carbon matrix and a silicon material, the carbon matrix has a cross-linked porous structure internally, and the silicon material is at least partially distributed in the cross-linked porous structure. A value of flexibility C1 of the silicon carbon composite material satisfies 0.4≤C1≤2. C1 is a factor by which a compression deformation variable of the silicon carbon composite material is scaled to be equal to its rebound deformation variable, representing flexibility of the silicon carbon composite material. When the C1 value satisfies 0.4≤C1≤2, the silicon carbon composite material has good flexibility, reducing overall impact of expansion stress of silicon on the silicon carbon composite material, and allowing for a certain degree of contractility of the carbon matrix framework, so that residual stress can be received and released, thereby maintaining overall stability of the silicon carbon composite material.

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.