公开(公告)号：US20240339616A1

公开(公告)日：2024-10-10

申请号：US18619209

申请日：2024-03-28

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Lei Li ,  Haiyang Kang ,  Yi Zheng ,  Meihuang Chen ,  Chengdong Sun

IPC: H01M4/62 ,  H01M4/02

CPC classification number: H01M4/622 ,  H01M2004/021

Abstract: The present application relates to the technical field of secondary batteries, and in particular to a binder for secondary batteries and a preparation method thereof, a separator comprising the binder, a battery cell, a battery and an electrical apparatus. The binder for secondary batteries includes an organic polymer. The organic polymer has a first glass transition temperature and a second glass transition temperature, the first glass transition temperature is less than or equal to 25° C., and the second glass transition temperature is greater than 25° C. During coating of a separator, the binder is non-viscous at room temperature to facilitate winding and unwinding of the separator. However, the binder has a better bonding force when a cold pressing process is carried out after the winding with positive and negative electrode plates, so that the positive and negative electrode plates and the separator fit each other closely.

公开(公告)号：US20240356156A1

公开(公告)日：2024-10-24

申请号：US18592548

申请日：2024-03-01

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Lei Li ,  Haiyang Kang ,  Yi Zheng ,  Meihuang Chen ,  Runhao Lai ,  Peng Wang ,  Chengdong Sun

IPC: H01M50/42 ,  C08J3/12 ,  C08L23/12 ,  C08L33/06 ,  H01M50/417 ,  H01M50/449

CPC classification number: H01M50/42 ,  C08J3/126 ,  C08L23/12 ,  C08L33/066 ,  H01M50/417 ,  H01M50/449 ,  C08J2323/12 ,  C08J2333/08 ,  C08L2203/20 ,  C08L2207/53

Abstract: The present application relates to the technical field of secondary batteries, and in particular to a binder for secondary batteries and a preparation method, a secondary battery, and an electrical apparatus thereof. The binder includes a core structure and a shell structure disposed on a surface of the core structure. The shell structure includes an acrylate copolymer, and the core structure comprises a rigid polymer. The rigid polymer has a crystallinity ranging from 32% to 94%. The binder with a core-shell structure includes the core structure of the rigid polymer. During cold pressing of a battery cell, the rigid polymer acts as a support, making a particle structure of the binder stable, that is, the rigid polymer acts as a support, resulting in an overall increase in the rigidity of the binder.

公开(公告)号：US20240356155A1

公开(公告)日：2024-10-24

申请号：US18592528

申请日：2024-03-01

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Lei Li ,  Meihuang Chen ,  Yi Zheng ,  Haiyang Kang ,  Runhao Lai ,  Chengdong Sun

IPC: H01M50/42 ,  H01M50/449

CPC classification number: H01M50/42 ,  H01M50/449

Abstract: The present application relates to the technical field of secondary batteries, and more particularly relates to a binder for secondary batteries, a separator, a secondary battery and an electrical apparatus. The binder for secondary batteries is in a ring shape, and includes an acrylate copolymer. The acrylate copolymer has good adhesion, and a contact point of the binder with the ring-shaped structure is a circle line of the ring-shaped binder. The ring-shaped binder has bonding points with larger areas than a spherical binder, such that good bonding performance can be achieved when the usage amount of the binder with the ring-shaped structure is reduced.

公开(公告)号：US20240347857A1

公开(公告)日：2024-10-17

申请号：US18592560

申请日：2024-03-01

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Lei Li ,  Chengdong Sun ,  Yi Zheng ,  Haiyang Kang ,  Meihuang Chen

IPC: H01M50/42

CPC classification number: H01M50/42

Abstract: The present application relates to the technical field of secondary batteries, and in particular to a binder for secondary batteries and a preparation method thereof, as well as a separator, battery cell, battery and electrical apparatus comprising the binder. The binder for secondary batteries includes a first polymer and a second polymer, the first polymer includes an acrylate copolymer, and the second polymer includes a water-soluble polymer. When the separator is coated, the binder is stirred evenly in water, coated on the separator, and oven dried to form a bonding layer on the separator. The bonding layer includes a side facing the separator and a side away from the separator. The bonding layer is bonded on the separator, and the side away from the separator has no adhesiveness, which facilitates the winding and unwinding of the separator.