CN-224217578-U - Battery and cover plate assembly thereof

Abstract

The utility model discloses a cover plate assembly, which comprises a cover plate, wherein a lug leading-out hole is formed in the cover plate, a lug adapter is arranged in the lug leading-out hole, insulation sealing is carried out between the lug adapter and the cover plate, a lug adapter hole is formed in the lug adapter, and the geometric dimension of the lug adapter hole is gradually reduced along the direction from inside to outside. The utility model also discloses a battery, which comprises a battery body, wherein the battery body comprises a shell and a battery core, the shell comprises a shell and a cover plate assembly covered on the shell, the cover plate assembly is adopted, the battery core is provided with a tab, a pole post matched with the tab switching hole is welded on the tab, and a circle of welding seal is formed between the pole post and the tab switching piece in a surrounding manner. The battery and the cover plate component thereof have the advantages of simple structure and convenient assembly, and can ensure the sealing performance and the electricity receiving performance of the electrode lugs.

Inventors

• XIN MINCHANG
• LIU HAISHENG
• LI HAIJUAN

Assignees

• 九环时代电池有限公司

Dates

Publication Date

20260508

Application Date

20250513

Priority Date

20250430

Claims (19)

1. 1. The cover plate assembly is characterized by comprising a cover plate, wherein at least one lug leading-out hole is formed in the cover plate, a lug adapter is arranged in the lug leading-out hole, insulation sealing is carried out between the lug adapter and the cover plate, a lug adapter hole is formed in the lug adapter, and the geometric dimension of the lug adapter hole is gradually reduced along the direction from inside to outside.
2. 2. The cover plate assembly of claim 1, wherein an insulating seal surrounding the tab exit hole is disposed between the tab adapter and the cover plate.
3. 3. The cover plate assembly of claim 2, wherein a first caulking groove is formed in the outer peripheral wall of the insulating sealing member, and the groove bottom of the first caulking groove is in sealing fit with the inner wall of the tab leading-out hole, and the side walls of the two sides of the first caulking groove are respectively in sealing fit with the inner side surface and the outer side surface of the cover plate.
4. 4. The cover plate assembly of claim 3, wherein the inner wall of the tab leading-out hole and/or at least one side surface of the cover plate are provided with a first sealing protrusion and a first sealing groove which are matched with the insulating sealing member at intervals, and/or, The inner wall of the tab leading-out hole and/or at least one side surface of the cover plate are/is provided with a rough surface matched with the insulating sealing piece.
5. 5. The cover plate assembly of claim 2, wherein a second caulking groove which surrounds a circle and is matched with the insulating sealing member is formed in the peripheral wall of the tab adapter, and the groove bottom of the second caulking groove is in sealing fit with the inner wall of the insulating sealing member and the side walls of the two sides of the second caulking groove are respectively in sealing fit with the inner side surface and the outer side surface of the insulating sealing member.
6. 6. The cover plate assembly according to claim 5, wherein a second sealing protrusion and a second sealing groove which are matched with the insulating sealing piece are arranged on the bottom of the second caulking groove and/or on at least one side wall of the second caulking groove, and/or, The groove bottom of the second caulking groove and/or at least one side wall of the second caulking groove is provided with a rough surface matched with the insulating sealing piece.
7. 7. The cover plate assembly according to any one of claims 1 to 6, wherein the tab adapter is provided with a groove therein, and wherein: the groove is arranged to surround the lug through hole for one circle, or, The groove is arranged as one and surrounds the lug through hole for a circle, a plurality of reinforcing ribs are arranged between the side walls at two sides of the groove at intervals, or, The grooves are arranged in a plurality and surround the lug switching holes.
8. 8. The cover plate assembly of claim 7, wherein the notch of the groove is formed on the inner side surface of the tab adapter and extends outwards along the axial direction of the tab adapter hole.
9. 9. The cover plate assembly of claim 1, wherein the tab adapter comprises an inner adapter and an outer adapter which are respectively positioned at the inner side and the outer side of the cover plate, insulation sealing gaskets are respectively arranged between the inner adapter and the cover plate and the outer adapter, the tab adapter hole is formed in the outer adapter, and fasteners used for pressing the insulation sealing gaskets are arranged between the inner adapter and the outer adapter at intervals around the tab adapter hole.
10. 10. The cover plate assembly as claimed in claim 9, wherein the fastener is a rivet, and the rivet is sleeved with an insulating sleeve.
11. 11. The cover plate assembly of claim 9, wherein the inner rotating member is provided with a through hole, the outer rotating member is provided with a rotating part extending inwards through the through hole, the lug rotating hole is arranged in the rotating part, and a gap is reserved between the inner wall of the through hole and the outer wall of the rotating part.
12. 12. The cover plate assembly of claim 1, wherein any two planes parallel to each other and perpendicular to the axis of the tab adapter hole are of similar cross-section.
13. 13. The cover plate assembly of claim 1, wherein the top surface of the tab adapter is provided with a welding boss surrounding the tab adapter hole.
14. 14. A battery comprises a battery body, wherein the battery body comprises a shell and a battery core, the shell comprises a shell and a cover plate assembly covered on the shell, and the battery is characterized in that the cover plate assembly is the cover plate assembly according to any one of claims 1-13, a tab is arranged on the battery core, a pole post matched with a tab switching hole is welded on the tab, and a circle of welding seal is formed between the pole post and the tab switching piece in a surrounding mode.
15. 15. The battery of claim 14, wherein the tab adapter is provided with a groove, a notch of the groove is formed on the inner side surface of the tab adapter and extends outwards along the axial direction of the tab adapter hole, an insulating part is arranged between the battery core and the cover plate, and a first wedge block matched with the groove and inserted into the groove is arranged on the insulating part.
16. 16. The battery of claim 14, wherein the tab adapter comprises an inner adapter and an outer adapter which are respectively positioned at the inner side and the outer side of the cover plate, a through hole is formed in the inner adapter, an adapter part which extends inwards to pass through the through hole is formed in the outer adapter, the tab adapter hole is formed in the adapter part, a gap is formed between the inner wall of the through hole and the outer wall of the adapter part, an insulating part is arranged between the battery cell and the cover plate, and a second wedge block which is matched with the gap and is inserted into the gap is arranged on the insulating part.
17. 17. The battery of claim 14, wherein the top surface of the post is provided with at least one threaded hole.
18. 18. The battery of claim 14, wherein the battery body is provided with at least one first tab and at least one second tab, the first tab and the second tab are provided on end surfaces of two ends of the battery body, or the first tab and the second tab are provided on at least one of side surfaces of two sides of the battery body.
19. 19. The battery of claim 14, wherein the battery body has a length L, a width H, and a thickness D, the length L of the battery body is greater than the width H, the width H of the battery body is greater than the thickness D, and L/H <4, L/D is less than 50.

Description

Battery and cover plate assembly thereof Technical Field The utility model belongs to the technical field of batteries, and particularly relates to a battery and a cover plate assembly thereof. Background The battery comprises a shell and a battery cell arranged in the shell, wherein the shell comprises a shell sleeved outside the battery cell and a cover plate assembly covered on the shell. The cover plate component is an important functional component of the battery, and is provided with a lug, an explosion-proof valve and the like. Since the tab is a connection terminal for connecting the battery cell to an external circuit, it is necessary to insulate the tab. In addition, in order to draw out the tab, it is necessary to open a hole in the cover plate, and in order to prevent leakage of internal substances such as electrolyte, it is necessary to seal the tab. Therefore, the structure of the cover plate assembly at the position of the lead-out tab is often complex, a complex insulation and sealing structure is required to be arranged, and meanwhile, the electrical connection performance between the tab and the battery cell and between the tab and an external circuit is required to be ensured. Disclosure of Invention Therefore, the utility model aims to provide a battery and a cover plate assembly thereof, which have the advantages of simple structure and convenient assembly and can ensure the sealing performance and the electricity connection performance of the electrode lugs. In order to achieve the above purpose, the present utility model provides the following technical solutions: The utility model firstly provides a cover plate assembly, which comprises a cover plate, wherein at least one lug leading-out hole is formed in the cover plate, a lug adapter is arranged in the lug leading-out hole, insulation sealing is carried out between the lug adapter and the cover plate, a lug adapter hole is formed in the lug adapter, and the geometric dimension of the lug adapter hole is gradually reduced along the direction from inside to outside. Further, an insulating sealing piece surrounding the tab leading-out hole is arranged between the tab adapter and the cover plate. Further, a first caulking groove which surrounds a circle is formed in the peripheral wall of the insulating sealing piece, and the groove bottom of the first caulking groove is in sealing fit with the inner wall of the tab leading-out hole and the side walls of the two sides of the first caulking groove are respectively in sealing fit with the inner side face and the outer side face of the cover plate. Further, a first sealing protrusion and a first sealing groove matched with the insulating sealing piece are arranged on the inner wall of the tab leading-out hole and/or on at least one side surface of the cover plate at intervals, and/or, The inner wall of the tab leading-out hole and/or at least one side surface of the cover plate are/is provided with a rough surface matched with the insulating sealing piece. Further, a second caulking groove which surrounds a circle and is matched with the insulating sealing piece is formed in the peripheral wall of the tab adapter, and the groove bottom of the second caulking groove is in sealing fit with the inner wall of the insulating sealing piece and the side walls of the two sides of the second caulking groove are respectively in sealing fit with the inner side surface and the outer side surface of the insulating sealing piece. Further, a second sealing protrusion and a second sealing groove matched with the insulating sealing piece are arranged on the bottom of the second caulking groove and/or on at least one side wall of the second caulking groove, and/or, The groove bottom of the second caulking groove and/or at least one side wall of the second caulking groove is provided with a rough surface matched with the insulating sealing piece. Further, a groove is arranged in the tab adapter, and: the groove is arranged to surround the lug through hole for one circle, or, The groove is arranged as one and surrounds the lug through hole for a circle, a plurality of reinforcing ribs are arranged between the side walls at two sides of the groove at intervals, or, The grooves are arranged in a plurality and surround the lug switching holes. Further, the notch of the groove is formed on the inner side surface of the tab adapter and extends outwards along the axial direction of the tab adapter hole. Further, the tab adapter comprises an inner adapter and an outer adapter which are respectively positioned at the inner side and the outer side of the cover plate, insulation sealing gaskets are respectively arranged between the inner adapter and the cover plate and between the outer adapter and the cover plate, the tab adapter hole is formed in the outer adapter, and fasteners used for pressing the insulation sealing gaskets are arranged between the inner adapter and the outer adapter at intervals around the tab a