Battery assembly and preparation method, battery and electric vehicle

Patent metadata

Field	Value
Publication number	US-12494535-B2
Application number	US-202217694708-A
Country	US
Kind code	B2
Filing date	Mar 15, 2022
Priority date	Mar 15, 2022
Publication date	Dec 9, 2025
Grant date	Dec 9, 2025

Abstract

Provided is a battery assembly, which includes a cover plate and a pole. The pole penetrates the cover plate and is fixed with the cover plate by riveting. For the battery assembly provided by the application, the pole and the cover plate are fixed by riveting. Compared with the fixing method of welding, it not only simplifies the fixing operation, improves the production efficiency, but also reduces the production cost. Also provided are a preparation method of a battery assembly, a battery and an electric vehicle.

First claim

What is claimed is:

1 . A battery assembly comprising a cover plate ( 2 ) and a pole ( 3 ), wherein the pole ( 3 ) penetrates the cover plate ( 2 ) and is fixed with the cover plate ( 2 ) by riveting;
the cover plate ( 2 ) is provided with a through hole ( 21 ), the pole ( 3 ) comprises a main body ( 30 A) and a first end ( 30 B) and a second end ( 30 C) respectively located at opposite ends of the main body ( 30 A), the first end ( 30 B) of the pole ( 3 ) is provided with a stopping part ( 31 ), and the stopping part ( 31 ) exists before the pole ( 3 ) and the cover plate ( 2 ) are riveted, the main body ( 30 A) is inserted in the through hole ( 21 ), the second end ( 30 C) of the pole ( 3 ) is mechanically pressed during the riveting process when the pole ( 3 ) and the cover plate ( 2 ) are riveted to form a flange ( 32 ) at the second end ( 30 C) of the pole ( 3 ) so that the cover plate ( 2 ) is clamped between the stopping part ( 31 ) and the flange ( 32 ) by riveting, wherein a diameter of the stopping part ( 31 ) is greater than that of the flange ( 32 ), with the stopping part ( 31 ) provided at a top of the pole ( 3 ) and the flange ( 32 ) provided at a bottom of the pole ( 3 ); the battery assembly further comprises a pressing block ( 4 ) and an insulating gasket ( 53 ), the pressing block ( 4 ) and the insulating gasket ( 53 ) are overlapped and laminated with each other along an axial direction of the pole ( 3 ) and sleeved on the second end ( 30 C) of the pole ( 3 ), the pressing block ( 4 ) is clamped between the flange ( 32 ) and the insulating gasket ( 53 ), and the insulating gasket ( 53 ) is clamped between the pressing block ( 4 ) and the cover plate ( 2 ); wherein the flange ( 32 ), the pressing block ( 4 ) and the insulating gasket ( 53 ) are located on an inner side of the cover plate ( 2 ), while the stopping part ( 31 ) is located on an outer side of the cover plate ( 2 ); the battery assembly further comprises a first current collecting plate ( 6 ), the first current collecting plate ( 6 ) comprises a plate body ( 61 ) and an electrical connection part ( 62 ), the electrical connection part ( 62 ) is formed by protruding from the plate body ( 61 ) towards the pole ( 3 ), the electrical connection part ( 62 ) has a circular cross section, and the electrical connection part ( 62 ) has a structure of a hollow truncated cone with a gradually reduced diameter along a direction toward the pole ( 3 ); the pole ( 3 ) is provided with a central hole ( 33 ), an inner wall of the central hole ( 33 ) is provided with an inclined surface ( 34 ) at the second end ( 30 C) of the pole ( 3 ), the electrical connection part ( 62 ) is inserted into the central hole ( 33 ), and an outer peripheral wall of the electrical connection part ( 62 ) is in contact with the inclined surface ( 34 ) of the central hole ( 33 ) to realize an electrical connection between the electrical connection part ( 62 ) and the pole ( 3 ); a first opening ( 35 ) is provided at an end face of the first end ( 30 B) of the pole ( 3 ) such that the central hole ( 33 ) is capable of communicating with an external environment through the first opening ( 35 ), a second opening ( 63 ) is provided at an end face of the electrical connection part ( 62 ), and the second opening ( 63 ) communicates an interior of the electrical connection part ( 62 ) with the central hole ( 33 ), wherein the first opening ( 35 ) has a diameter greater than the second opening ( 63 ), and the central hole ( 33 ) has a diameter greater than the second opening ( 63 ), the first opening ( 35 ) is located above and spaced from the second opening ( 63 ), and the second opening ( 63 ) is communicated with the first opening ( 35 ) through the central hole ( 33 ); the battery assembly further comprises a sealing sheet ( 9 ), the sealing sheet ( 9 ) is connected with the first end ( 30 B) of the pole ( 3 ) and hermetically seals the first opening ( 35 ).

2 . The battery assembly according to claim 1 , wherein the battery assembly further comprises an insulating sealing ring ( 51 ) located on the outer side of the cover plate ( 2 ), the insulating sealing ring ( 51 ) is sleeved on the pole ( 3 ), and the insulating sealing ring ( 51 ) is used for insulation and sealing between the pole ( 3 ) and the cover plate ( 2 ).

3 . The battery assembly according to claim 1 , wherein the pole ( 3 ) is a positive pole or a negative pole.

4 . A battery comprising the battery assembly according to claim 1 .

5 . The battery according to claim 4 , wherein the battery further comprises a housing ( 1 ), at least one end of the housing ( 1 ) is provided with an opening ( 11 ), the cover plate ( 2 ) is used to seal the opening ( 11 ) of the housing ( 1 ), the opposite ends of the pole ( 3 ) are respectively located outside the opening ( 11 ) of the housing ( 1 ) and inside the opening ( 11 ) of the housing ( 1 ).

6 . The battery according to claim 5 , wherein the battery further comprises a second current collecting plate ( 7 ) and a cell ( 8 ), and the first current collecting plate ( 6 ), the second current collecting plate ( 7 ) and the cell ( 8 ) are arranged in the housing ( 1 ), two sides of the first current collecting plate ( 6 ) are electrically connected with the pole ( 3 ) and a top end of the cell ( 8 ) respectively, and two sides of the second current collecting plate ( 7 ) are electrically connected with the housing ( 1 ) and a bottom end of the cell ( 8 ) respectively.

7 . An electric vehicle comprising the battery according to claim 4 .

8 . The battery assembly according to claim 2 , wherein a portion of the insulating sealing ring ( 51 ) is located in the through hole ( 21 ) and sandwiched between an outer wall of the pole ( 3 ) and an inner wall of the through hole ( 21 ), and another portion of the insulating sealing ring ( 51 ) is located on the outer side of the cover plate ( 2 ) and sandwiched between the stopping part ( 31 ) and the cover plate ( 2 ).

9 . The battery assembly according to claim 2 , wherein the battery assembly further comprises an insulating ring ( 52 ) located on the outer side of the cover plate ( 2 ), the insulating ring ( 52 ) is sandwiched between the stopping part ( 31 ) and the cover plate ( 2 ), and the insulating ring ( 52 ) is used to insulate the pole ( 3 ) from the cover plate ( 2 ), wherein the insulating ring ( 52 ) has a larger diameter than the insulating sealing ring ( 51 ) so that the insulating ring ( 52 ) is arranged around a periphery of the insulating sealing ring ( 51 ).

10 . The battery assembly according to claim 1 , wherein the pressing block ( 4 ) is an aluminum block.

11 . The battery assembly according to claim 1 , wherein a lower portion of the outer peripheral wall of the electrical connection part ( 62 ) is in contact with the inclined surface ( 34 ) of the central hole ( 33 ) to realize the electrical connection between the electrical connection part ( 62 ) and the pole ( 3 ), while an upper portion of the outer peripheral wall of the electrical connection part ( 62 ) is spaced from the inner wall of the central hole ( 33 ) to form a V-shaped groove ( 64 ) therebetween.

Assignees

• Microvast Power Systems Co Ltd
• Microvast Inc

Inventors

• Deng Guoyou
• Jin Yong
• Shen Xiaojie
• Yao Yu
• Yin Xiaofeng
• Wu Yang

Classifications

• H01M50/3425

  in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member · CPC title

• H01M50/55

  on the same side of the cell · CPC title

• H01M50/559

  Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells (H01M50/553 takes precedence) · CPC title

• H01M50/184

  characterised by their shape or structure · CPC title

• H01M50/188 Primary

  the sealing members being arranged between the lid and terminal · CPC title