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CN-224232864-U - Cap assembly and cylindrical battery

CN224232864UCN 224232864 UCN224232864 UCN 224232864UCN-224232864-U

Abstract

The utility model relates to the technical field of cylindrical battery structures, and provides a cap assembly and a cylindrical battery, wherein the cap assembly comprises a top cover plate, a bursting disc and a lower end plate, the bursting disc is abutted against and electrically connected to one side of the top cover plate, a first reinforcing table and a second reinforcing table are respectively fixedly arranged on two sides of the bursting disc, the second reinforcing table is clamped with the top cover plate, a center notch and an outer Zhou Kecao are formed in one side of the bursting disc, and the lower end plate is welded and electrically connected to one side, far away from the bursting disc, of the first reinforcing table. According to the utility model, the central notch and the outer Zhou Kecao are arranged on the explosion-proof piece, and the valve of the cap assembly can be opened in time when the battery is out of control by utilizing the cooperation of the central notch and the outer Zhou Kecao, and the first reinforcing table and the second reinforcing table are arranged on the explosion-proof piece, so that the assembly cooperation of the explosion-proof piece, the top cover plate and the lower end plate can be ensured, the structural strength of the explosion-proof piece can be enhanced, and the normal operation of the cylindrical battery is ensured.

Inventors

  • LI YANG
  • FANG CHAO
  • Wang Chitang

Assignees

  • 江苏睿恩新能源科技有限公司

Dates

Publication Date
20260512
Application Date
20250415

Claims (10)

  1. 1. The cap assembly is characterized by comprising a top cover plate (2), an explosion-proof piece (3) and a lower end plate (5), wherein, The explosion-proof sheet (3) is abutted against and electrically connected to one side of the top cover plate (2), a first reinforcing table (31) and a second reinforcing table (32) are fixedly arranged on two sides of the explosion-proof sheet (3) respectively, and the second reinforcing table (32) is clamped with the top cover plate (2); the lower end plate (5) is welded and electrically connected to one side, far away from the explosion-proof sheet (3), of the first reinforcing table (31).
  2. 2. A cap assembly according to claim 1, wherein the rupture disc (3) has a thickness H 0 and the second reinforcement abutment (32) has a thickness H 2 , wherein 50% (H 0 +H 2 )≤H 0 ≤70％(H 0 +H 2 ) and H 0 = 0.2mm-0.4mm.
  3. 3. A cap assembly according to claim 1, wherein said second reinforcing table (32) is of annular plate-like configuration and is coaxially arranged with respect to said rupture disc (3); The second reinforcing table (32) has a circular ring width L 41 at the side close to the explosion-proof sheet (3), and a circular ring width L 42 at the side far away from the explosion-proof sheet (3), wherein 68% of L 41 ≤L 42 ≤82％L 41 is L 41 =1 mm-1.3mm.
  4. 4. A cap assembly according to claim 2, wherein the first stiffening table (31) has a thickness H 1 , wherein 52% (H 0 +H 1 )≤H 0 ≤72％(H 0 +H 1 ) and (H 0 +H 1 ) =0.4 mm-0.6mm.
  5. 5. A cap assembly according to claim 3, wherein said first reinforcement abutment (31) is located in a central position of said rupture disc (3); The outer diameter of the explosion-proof sheet (3) is L 0 , the outer diameter of the side, far away from the explosion-proof sheet (3), of the first reinforcing table (31) is L 3 , wherein 8%L 0 ≤L 3 ≤18％L 0 is L 0 =15 mm-25mm.
  6. 6. The cap assembly according to claim 5, wherein the outer part Zhou Kecao (302) is a circular groove-shaped structure which is arranged at the outer edge of the explosion-proof sheet (3); The radius of the outer Zhou Kecao (302) is L 2 , where 12% L 2 ≤L 42 ≤22％L 2 .
  7. 7. A cap assembly according to any one of claims 1-6, wherein the minimum distance from the outer Zhou Kecao (302) to the second reinforcing table (32) is L 5 , wherein L 5 = 0.1mm-0.3mm.
  8. 8. A cap assembly according to claim 5 or 6, wherein the minimum distance from the outer Zhou Kecao (302) to the peripheral side of the rupture disc (3) is L 1 , wherein 20% L 0 ≤L 1 ≤30％L 0 .
  9. 9. A cap assembly according to claim 2 or 4, wherein the depth of the outer Zhou Kecao (302) is H 3 , wherein 16% (H 0 +H 2 )≤(H 0 -H 3 )≤36％(H 0 +H 2 ).
  10. 10. A cylindrical battery comprising a cap assembly according to any one of claims 1-9.

Description

Cap assembly and cylindrical battery Technical Field The utility model relates to the technical field of cylindrical battery structures, in particular to a cap assembly and a cylindrical battery. Background The cap assembly is an important part of the battery, and is generally composed of an outer insulating ring, a top cover plate, an explosion-proof piece, an inner rubber ring, a lower end plate and other components, and the battery can be provided with good insulating performance and explosion-proof performance by utilizing the precise matching of the components in the cap assembly so as to ensure the safety of the battery. The outer insulating ring is made of plastic materials, and the tightness between the cap assembly and the battery shell is enhanced by utilizing the deformation performance of the outer insulating ring. When the cap assembly and the shell are assembled, the outer insulating ring deformed by the extrusion of the shell can extrude the inner explosion-proof sheet and other components. The invention discloses a large cylindrical battery with a PACK same-side welding rolling groove sealing structure, which is disclosed in the invention patent with publication number CN119518186A, wherein a cap rubber ring is arranged on the outer side of a cap explosion-proof piece, and components such as the explosion-proof piece are hermetically and insulatively arranged in a steel shell by using the cap rubber ring. When the cap rubber ring and the steel shell are assembled, the explosion-proof piece is deformed by extrusion of the cap rubber ring, so that the cap assembly in the steel shell is opened or not opened in advance, and safety risks exist. Disclosure of utility model In view of the above, the utility model provides a cap assembly and a cylindrical battery, which can enhance the structural strength of the explosion-proof piece and ensure the explosion-proof performance of the cap assembly and the cylindrical battery. The technical proposal of the utility model is realized in such a way that in one aspect, the utility model provides a cap assembly, which comprises a top cover plate, a bursting disc and a lower end plate, wherein, The explosion-proof sheet is abutted against and electrically connected to one side of the top cover plate, and a first reinforcing table and a second reinforcing table are fixedly arranged on two sides of the explosion-proof sheet respectively, and the second reinforcing table is clamped with the top cover plate; The lower end plate is welded and electrically connected to one side, away from the explosion-proof piece, of the first reinforcing table. On the basis of the above technical solution, preferably, the thickness of the explosion-proof sheet is H 0, and the thickness of the second reinforcing table is H 2, wherein 50% (H 0+H2)≤H0≤70％(H0+H2) and H 0 =0.2 mm-0.4mm. On the basis of the technical scheme, preferably, the second reinforcing table is of a circular annular plate-shaped structure and is coaxially arranged with the explosion-proof sheet; The second reinforcing table is close to the ring width of one side of the explosion-proof sheet and is L 41, the ring width of one side of the second reinforcing table far away from the explosion-proof sheet is L 42, wherein 68% of L 41≤L42≤82％ L41 is L 41 =1 mm-1.3mm. Still further preferably, the first reinforcement stand has a thickness H 1, wherein 52% (H 0+H1)≤H0≤72％(H0+H1), and (H 0+H1) =0.4 mm to 0.6mm. Still further preferably, the first reinforcing table is located at an intermediate position of the rupture disc; The external diameter of the explosion-proof sheet is L 0, the external diameter of one side of the first reinforcing table far away from the explosion-proof sheet is L 3, wherein 8%L 0≤L3≤18％ L0 is L 0 =15 mm-25mm. Still more preferably, the outer part Zhou Kecao is a circular groove-shaped structure, which is arranged at the outer edge of the explosion-proof piece; The radius of the outer Zhou Kecao is L 2, where 12% L 2≤L42≤22％ L2. On the basis of the above technical solution, preferably, a minimum distance from the peripheral notch to the second reinforcing table is L 5, where L 5 = 0.1mm-0.3mm. Still more preferably, the minimum distance from the peripheral score groove to the peripheral side of the rupture disc is L 1, wherein 20% L 0≤L1≤30％ L0. Still more preferably, the depth of the peripheral score groove is H 3, wherein 16% (H 0+H2)≤(H0-H3)≤36％(H0+H2). In a second aspect, the present utility model provides a cylindrical battery comprising a cap assembly as described above. Compared with the prior art, the cap assembly and the cylindrical battery have the following beneficial effects: (1) Through setting up central notch and outer Zhou Kecao on the explosion-proof piece, utilize the cooperation of two, can ensure that the block subassembly is in time opened the valve when the battery appears thermal runaway, through setting up first enhancement platform and second enhancement platform on the