CN-122025943-A - Cover plate assembly and battery monomer

Abstract

The application discloses a cover plate assembly and a battery monomer, and relates to the technical field of batteries. The cover plate component comprises a cover plate, a pole column and a sealing ring. The cover plate is provided with a mounting hole, the mounting hole is provided with an intersecting axial direction and a radial direction, the mounting hole axially penetrates through the cover plate, the pole is arranged in the mounting hole, the sealing ring is axially sleeved between the pole and the cover plate and comprises a first coating layer and a first high-temperature-resistant layer, the first coating layer is coated on the surface of the first high-temperature-resistant layer, the melting point of the first high-temperature-resistant layer is larger than that of the first coating layer, so that the mounting hole where the pole is located can be sealed by the cover plate component under any temperature condition, and the sealing reliability of the battery cell under extreme temperature is improved.

Inventors

• ZHAO LINA
• LI TINGTING
• Miao Shijie

Assignees

• 阳光电源股份有限公司

Dates

Publication Date

20260512

Application Date

20241111

Claims (19)

1. 1. A cover assembly for a battery cell, comprising: The cover plate is provided with a mounting hole, the mounting hole is provided with an intersecting axial direction and a radial direction, and the mounting hole penetrates through the cover plate along the axial direction; a pole disposed in the mounting hole, and The sealing ring is sleeved between the pole and the cover plate in the axial direction, the sealing ring comprises a first coating layer and a first high-temperature-resistant layer, the first coating layer is coated on the surface of the first high-temperature-resistant layer, and the melting point of the first high-temperature-resistant layer is larger than that of the first coating layer.
2. 2. The battery cell cover assembly of claim 1, wherein the cover assembly comprises a plurality of seal members, The cover plate is provided with a convex ring which extends into the mounting hole along the radial direction; The pole comprises a column body and a connecting part, the column body is arranged in the mounting hole in a penetrating mode, and the connecting part is connected with one end of the column body in the axial direction; The sealing ring is arranged between the convex ring and the connecting part in the axial direction, and the connecting part extends along the radial direction and is partially overlapped with the cover plate in the axial direction.
3. 3. The battery cell cover assembly of claim 2, wherein, The first high-temperature resistant layer is of an annular structure, the largest dimension between the inner wall and the outer wall of the first high-temperature resistant layer in the radial direction is R 1 , the axial distance between the convex ring and the connecting portion is D 1 , and R 1 ≥D 1 is met between R 1 、D 1 .
4. 4. The battery cell cover assembly of any one of claim 1 to 3, The first coating layer is made of at least one of fluororubbers, silicone rubbers and polyolefin; The material adopted by the first high temperature resistant layer comprises at least one of high temperature resistant polymer, inorganic matter and organic-inorganic mixture.
5. 5. The battery cell cover assembly of claim 4, wherein the cover assembly, The high-temperature resistant polymer comprises at least one of polyether ether ketone, aramid fiber, polyimide and polytetrafluoroethylene, the inorganic substance comprises at least one of a non-metal simple substance and an oxide thereof, a metal simple substance and an oxide thereof, an alloy and ceramic, and the organic-inorganic mixture comprises at least one of a ceramic resin mixture, a metal and an oxide thereof and a resin mixture.
6. 6. The battery cell cover assembly of claim 1, wherein the cover assembly comprises a plurality of seal members, The flexural modulus of the first coating layer is K 1 , and the flexural modulus of the first high-temperature resistant layer is K 2 , wherein K 1 、K 2 meets K 1 ＞K 2 .
7. 7. A cover assembly for a battery cell, comprising: The cover plate is provided with a mounting hole, the mounting hole is provided with an intersecting axial direction and a radial direction, and the mounting hole penetrates through the cover plate along the axial direction; a pole disposed in the mounting hole, and The upper plastic is arranged on the cover plate, and part of the upper plastic extends into the mounting hole and is arranged between the pole and the cover plate in the radial direction; The plastic part comprises a second coating layer and a second high-temperature-resistant layer, wherein the second coating layer is coated on the surface of the second high-temperature-resistant layer, and the melting point of the second high-temperature-resistant layer is larger than that of the second coating layer.
8. 8. The battery cell cover assembly of claim 7, wherein the cover assembly, The cover plate is provided with a convex ring which extends into the mounting hole along the radial direction; The upper plastic comprises a first part and a second part which are connected, wherein the second part is connected with the first part in the axial direction, the first part is arranged between the convex ring and the pole in the radial direction, and the second part is positioned on the convex ring, and the first part comprises the second coating layer and the second high-temperature resistant layer.
9. 9. The battery cell cover assembly of claim 8, wherein the cover assembly, The second high temperature resistant layer is of an annular structure, the largest dimension between the inner wall and the outer wall of the second high temperature resistant layer in the radial direction is R 2 , the distance between the outer wall of the pole and the convex ring in the radial direction is D 2 , and R 2 ≥D 2 is met between R 2 、D 2 .
10. 10. The battery cell cover assembly of any one of claim 7 to 9, The second coating layer is made of at least one of polypropylene, polyethylene, polyimide and conductive polypropylene; The material adopted by the second high temperature resistant layer comprises at least one of high temperature resistant polymer, inorganic matter and organic-inorganic mixture.
11. 11. The cover plate assembly of a battery cell according to claim 10, wherein the high temperature resistant polymer comprises at least one of polyetheretherketone, aramid, polyimide, polytetrafluoroethylene, the inorganic substance comprises at least one of non-metallic simple substance and oxide thereof, alloy, ceramic, and the organic-inorganic mixture comprises at least one of ceramic resin mixture, metal and oxide thereof, and resin mixture.
12. 12. The battery cell cover assembly of claim 7, wherein the cover assembly, The flexural modulus of the second high temperature resistant layer is K 3 , and the flexural modulus of the second coating layer is K 4 , wherein K 3 、K 4 meets K 3 ＞K 4 .
13. 13. A cover assembly for a battery cell, comprising: The cover plate is provided with a mounting hole, the mounting hole is provided with an intersecting axial direction and a radial direction, and the mounting hole penetrates through the cover plate along the axial direction; the pole is arranged in the mounting hole; The sealing ring is sleeved between the pole and the cover plate in the axial direction and comprises a first coating layer and a first high-temperature-resistant layer, the first coating layer is coated on the surface of the first high-temperature-resistant layer, and the melting point of the first high-temperature-resistant layer is larger than that of the first coating layer; An upper plastic disposed on one side of the cover plate away from the seal ring, a portion of the upper plastic extending into the mounting hole and disposed between the post and the cover plate in the radial direction, and The plastic part comprises a second coating layer and a second high-temperature-resistant layer, wherein the second coating layer is coated on the surface of the second high-temperature-resistant layer, and the melting point of the second high-temperature-resistant layer is larger than that of the second coating layer.
14. 14. The battery cell cover assembly of claim 13, wherein the cover assembly comprises a plurality of metal plates, The cover plate is provided with a convex ring which extends into the mounting hole along the radial direction; The pole comprises a column body and a connecting part, the column body is arranged in the mounting hole in a penetrating mode, and the connecting part is connected with one end of the column body in the axial direction; The sealing ring is arranged between the convex ring and the connecting part in the axial direction, and the connecting part extends along the radial direction and is partially overlapped with the cover plate in the axial direction.
15. 15. The battery cell cover assembly of claim 14, wherein the cover assembly comprises a plurality of metal plates, The upper plastic comprises a first part and a second part which are connected, wherein the second part is connected with the first part in the axial direction, the first part is arranged between the convex ring and the pole in the radial direction, and the second part is positioned on the convex ring; wherein the first portion includes the second clad layer and the second high temperature resistant layer.
16. 16. The battery cell cover assembly of claim 14, wherein the cover assembly comprises a plurality of metal plates, The first high temperature resistant layer is of an annular structure, and in the radial direction, the maximum size between the inner wall and the outer wall of the first high temperature resistant layer is R 1 , the axial distance between the convex ring and the connecting part is D 1 , wherein R 1 ≥D 1 is satisfied between R 1 、D 1 ; The second high temperature resistant layer is of an annular structure, the largest dimension between the inner wall and the outer wall of the second high temperature resistant layer in the radial direction is R 2 , the distance between the outer wall of the pole and the convex ring in the radial direction is D 2 , and R 2 ≥D 2 is met between R 2 、D 2 .
17. 17. The battery cell cover assembly of claim 13, wherein the cover assembly comprises a plurality of metal plates, The flexural modulus of the first coating layer is K 1 , the flexural modulus of the first high-temperature resistant layer is K 2 , the flexural modulus of the second high-temperature resistant layer is K 3 , and the flexural modulus of the second coating layer is K 4 , wherein K 1 、K 2 、K 3 、K 4 meets K 1 ＞K 2 ≥K 3 ＞K 4 .
18. 18. The battery cell cover assembly of any one of claim 13 to 15, wherein, The melting point of the first coating layer is P 1 , the melting point of the first high-temperature-resistant layer is P 2 , the melting point of the second high-temperature-resistant layer is P 3 , and the melting point of the second coating layer is P 4 , wherein P 1 、P 2 、P 3 、P 4 meets the requirement of P 2 ＞P 3 ≥P 1 ＞P 4 .
19. 19. A battery cell, comprising: A housing having an opening, and A cover assembly as claimed in any one of claims 1 to 18, provided to the housing for closing the opening.

Description

Cover plate assembly and battery monomer Technical Field The application relates to the technical field of batteries, in particular to a cover plate assembly and a battery monomer. Background The battery cell comprises a shell, a cover plate assembly and an electrode assembly, wherein the electrode assembly is arranged in the shell, and the cover plate assembly is arranged on the shell and seals the opening of the shell. The cover plate component comprises a cover plate, a pole column, upper plastic, lower plastic and a sealing ring, wherein the pole column is arranged in a through hole of the cover plate, the upper plastic is arranged above the cover plate at a position corresponding to the pole column, and the lower plastic is arranged below the cover plate at a position corresponding to the pole column. Because the upper plastic and the sealing ring are made of materials with narrower isothermal domains such as polyolefin and fluororubber, when the battery monomer is in other abnormal working conditions such as extremely high temperature, the upper plastic or the sealing ring is extremely easy to soften, deform and even melt, so that the sealing and the insulation of the battery monomer are invalid, and serious safety risks are brought. Disclosure of Invention The invention aims to provide a cover plate assembly and a battery cell so as to solve the technical problems of sealing and insulation failure of the battery cell. The application provides a cover plate assembly of a battery monomer, which comprises a cover plate, a polar column and a sealing ring, wherein the cover plate is provided with a mounting hole, the mounting hole is provided with an intersecting axial direction and a radial direction, the mounting hole penetrates through the cover plate along the axial direction, the polar column is arranged in the mounting hole, the sealing ring is axially sleeved between the polar column and the cover plate, the sealing ring comprises a first coating layer and a first high-temperature resistant layer, the first coating layer is coated on the surface of the first high-temperature resistant layer, and the melting point of the first high-temperature resistant layer is larger than that of the first coating layer. In some embodiments, the cover plate is provided with a convex ring, the convex ring extends into the mounting hole in the radial direction, the pole column comprises a column body and a connecting part, the column body is arranged in the mounting hole in a penetrating mode, the connecting part is connected with one end of the column body in the axial direction, the sealing ring is arranged between the convex ring and the connecting part in the axial direction, and the connecting part extends in the radial direction and is overlapped with the cover plate in the axial direction. In some embodiments, the first high temperature resistant layer is of an annular structure, the largest dimension between the inner wall and the outer wall of the first high temperature resistant layer in the radial direction is R 1, the axial distance between the convex ring and the connecting part is D 1, and R 1≥D1 is satisfied between R 1、D1. In some embodiments, the first coating layer is made of at least one of fluororubber, silicone rubber and polyolefin, and the first high temperature resistant layer is made of at least one of high temperature resistant polymer, inorganic substance and organic-inorganic mixture. In some embodiments, the high temperature resistant polymer comprises at least one of polyetheretherketone, aramid, polyimide, polytetrafluoroethylene, the inorganic substance comprises at least one of non-metallic simple substance and oxide thereof, alloy, ceramic, and the organic-inorganic mixture comprises at least one of ceramic resin mixture, metal and oxide thereof, and resin mixture. In some embodiments, the first cladding layer has a flexural modulus of K 1 and the first high temperature resistant layer has a flexural modulus of K 2, where K 1、K2 satisfies K 1＞K2. The application provides a cover plate assembly of a battery monomer, which comprises a cover plate, a pole column and an upper plastic, wherein the cover plate is provided with a mounting hole, the mounting hole is provided with an intersecting axial direction and a radial direction, the mounting hole penetrates through the cover plate along the axial direction, the pole column is arranged in the mounting hole, the upper plastic is arranged on the cover plate, a part of the upper plastic extends into the mounting hole and is arranged between the pole column and the cover plate in the radial direction, the part of the upper plastic comprises a second coating layer and a second high-temperature-resistant layer, the second coating layer is coated on the surface of the second high-temperature-resistant layer, and the melting point of the second high-temperature-resistant layer is larger than that of the second coating layer. In some embodiment