CN-119650987-B - Single battery

Abstract

The application discloses a single battery, and belongs to the technical field of batteries. The single battery comprises a cover plate assembly, the cover plate assembly comprises a cover plate body, a first pole and a second pole, the cover plate body is provided with an assembly hole, the first pole comprises a penetrating portion and a first main body portion, the first main body portion is arranged on one side of the cover plate body in the thickness direction, the penetrating portion is connected with the first main body portion and is at least partially protruding into the assembly hole, the second pole comprises a connecting portion and a second main body portion, the second main body portion is arranged on one side of the cover plate body, which is away from the first main body portion, the connecting portion is connected with the first main body portion and is at least partially protruding into the assembly hole and is abutted against the first main body portion, the connecting portion is provided with a through hole, the penetrating portion is penetrating into the through hole, the penetrating portion is welded with the connecting portion to form a first welding portion, and the first main body portion is welded with the connecting portion to form a second welding portion. The connection stability is improved through the double welding structure, and the tightness of the single battery is improved.

Inventors

• SUN CHAO

Assignees

• 蜂巢能源科技股份有限公司

Dates

Publication Date

20260512

Application Date

20250120

Claims (6)

1. 1. A single cell comprising a cover plate assembly, the cover plate assembly comprising: The cover plate body is provided with an assembly hole; The first pole comprises a penetrating part and a first main body part, the first main body part is arranged on one side of the cover plate body along the thickness direction, and the penetrating part is connected with the first main body part and at least partially protrudes into the assembly hole; the second pole comprises a connecting part and a second main body part, the second main body part is arranged on one side, deviating from the first main body part, of the cover plate body, the connecting part is connected with the first main body part, at least part of the connecting part is convexly arranged in the assembly hole and is abutted to the first main body part, the connecting part is provided with a through hole along the thickness direction, and the penetrating part penetrates through the through hole; The penetrating part is welded with the connecting part and is provided with a first welding part; the first main body part is welded with the connecting part and is provided with a second welding part; the connecting part has a thickness dimension h, the first welding part has a penetration dimension h 1 , and the second welding part has a penetration dimension h 2 , wherein h is more than or equal to 0.5mm and less than or equal to 1.5mm, h 1 /h≤1.5,0.5≤（h 2 -h is more than or equal to 0.8)/h is less than or equal to 1; The first welding part has a melting width dimension w 1 which is more than or equal to 0.3mm and less than or equal to 1 and less than or equal to 2mm, and the second welding part has a melting width dimension w 2 which is more than or equal to 1.5mm and less than or equal to 2 and less than or equal to 5mm; the cover plate assembly further comprises a first sealing element and a second sealing element, the first sealing element comprises a first section and a second section which are connected, the first section is clamped between the first main body part and the cover plate body, and the second section is clamped between the first main body part and the second main body part; The second sealing piece is clamped between the cover plate body and the second main body part and is positioned at one side of the second section away from the connecting part; Along the horizontal direction of the cover plate component, the distance between the penetrating part and the hole wall of the penetrating hole has the minimum dimension d, and d is more than or equal to 0.05mm and less than or equal to 0.2mm.
2. 2. The cell according to claim 1, wherein the second post is provided with a sink groove on a side facing away from the first main body portion, the sink groove being in communication with the through-hole.
3. 3. The battery cell according to claim 2, wherein the connecting portion includes a bottom wall and a side wall connected to each other, the bottom wall is abutted to the first body portion, the side wall is connected around one side of the bottom wall facing away from the first body portion, the bottom wall and the side wall enclose the sink groove, and the second body portion is connected around one side of the side wall facing away from the sink groove.
4. 4. The cell according to claim 2, wherein the sink has a minimum dimension c in a horizontal direction of the cap assembly, satisfying 3.5mm c 20mm.
5. 5. The single battery according to claim 1, wherein the penetrating part is provided with a riveting hole at one end away from the first main body part, the hole diameter of the riveting hole is R, the hole depth is H, and R is more than or equal to 1.5mm and less than or equal to 5mm, and H is more than or equal to 0.1mm and less than or equal to 1mm.
6. 6. The unit cell according to claim 1, wherein a cross section of the penetrating portion and the penetrating hole in a horizontal direction of the cap plate assembly is any one of a circle, an ellipse, and a polygon.

Description

Single battery Technical Field The application belongs to the technical field of batteries, and particularly relates to a single battery. Background The lithium battery consists of a shell, an electric core arranged in the shell and a cover plate. The lithium battery cover plate structure is an important ring, and the cover plate structure is provided with a pole for electrically connecting the battery core and connecting with an external circuit. Be equipped with utmost point post structure on the lithium cell apron, including last utmost point post and lower utmost point post, through last utmost point post and lower utmost point post welded fastening, realize the common centre gripping to apron body, sealing washer and insulating part to guarantee that a series of performances such as later stage in the use, its sealing performance, insulating properties, durability all reach corresponding standard. However, the conventional welding method has insufficient structural strength, and affects the sealing performance of the single battery. Disclosure of Invention The embodiment of the application provides a single battery, which aims to solve the technical problem that the sealing performance of the single battery is affected due to the fact that the welding of the current pole structure is not firm. The embodiment of the application discloses a single battery, which comprises a cover plate assembly, wherein the cover plate assembly comprises: The cover plate body is provided with an assembly hole; The first pole comprises a penetrating part and a first main body part, the first main body part is arranged on one side of the cover plate body along the thickness direction, and the penetrating part is connected with the first main body part and at least partially protrudes into the assembly hole; the second pole comprises a connecting part and a second main body part, the second main body part is arranged on one side, deviating from the first main body part, of the cover plate body, the connecting part is connected with the first main body part, at least part of the connecting part is convexly arranged in the assembly hole and is abutted to the first main body part, the connecting part is provided with a through hole along the thickness direction, and the penetrating part penetrates through the through hole; The penetrating part is welded with the connecting part and is provided with a first welding part; the first body portion is welded to the connecting portion and is formed with a second welded portion. In some embodiments, the penetrating portion has a minimum dimension d from the wall of the through hole along the horizontal direction of the cover plate assembly, satisfying 0.05mm < d < 0.2mm. In some embodiments, the second post is provided with a sink groove at a side facing away from the first main body part, and the sink groove is communicated with the through hole. In some embodiments, the connecting portion includes a bottom wall and a side wall that are connected, the bottom wall is abutted to the first body portion, the side wall is connected around the side of the bottom wall that faces away from the first body portion, the bottom wall and the side wall enclose the sink, and the second body portion is connected around the side of the side wall that faces away from the sink. In some embodiments, the connection has a thickness dimension h, the first weld has a penetration dimension h 1, and the second weld has a penetration dimension h 2, satisfying 0.5 mm≤h≤1.5 mm, 0.8≤h 1/h≤ 1.5,0.5≤ (h 2-h)/h≤1. In some embodiments, the first weld has a width dimension w 1, satisfying 0.3mm +.w 1 +.2 mm, and the second weld has a width dimension w 2, satisfying 1.5mm +.w 2 +.5 mm. In some embodiments, the sink groove has a minimum dimension c in the horizontal direction of the deck assembly, satisfying 3.5mm c 20mm. In some embodiments, the penetrating portion is provided with a riveting hole at one end away from the first main body portion, the hole diameter of the riveting hole is R, the hole depth is H, and the conditions that R is more than or equal to 1.5mm and less than or equal to 5mm and H is more than or equal to 0.1mm and less than or equal to 1mm are satisfied. In some embodiments, the cross-section of the penetrating portion and the penetrating hole along the horizontal direction of the cover plate assembly is any one of a circle, an ellipse, or a polygon. In some embodiments, the cover assembly further comprises a first seal comprising a first section and a second section connected, the first section sandwiched between the first body portion and the cover body, the second section sandwiched between the first body portion and the second body portion; The second sealing piece is clamped between the cover plate body and the second main body part and is positioned at one side of the second section away from the connecting part. The application also discloses a preparation process of the single battery, wh