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CN-224232758-U - Battery cap and battery

CN224232758UCN 224232758 UCN224232758 UCN 224232758UCN-224232758-U

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cap and a battery. The battery cap comprises a top cover and an explosion-proof valve, wherein the top cover is arranged at the top of the explosion-proof valve, a height difference gap is formed between the peripheral edge of the top cover and the peripheral edge of the explosion-proof valve, a sealing ring is sleeved on the outer sides of the top cover and the explosion-proof valve, a first sealing bulge is arranged on the inner wall of the sealing ring, and the first sealing bulge is matched in the height difference gap and seals the height difference gap. The utility model provides a battery cap, which utilizes a first sealing bulge on a sealing ring to effectively seal a height difference gap, considers various challenges in actual production and use, and ensures that a battery can still maintain good tightness and safety even under the condition of manufacturing errors.

Inventors

  • SUN CHAO

Assignees

  • 蜂巢能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250418

Claims (10)

  1. 1. A battery cap, comprising: The explosion-proof device comprises a top cover (1) and an explosion-proof valve (2), wherein the top cover (1) is arranged at the top of the explosion-proof valve (2) in a covering mode, a height difference is formed between the peripheral edge of the top cover (1) and the peripheral edge of the explosion-proof valve (2), and a height difference gap (11) is formed; The sealing ring (3) is sleeved on the outer side of the top cover (1) and the explosion-proof valve (2), a first sealing protrusion (321) is arranged on the inner wall of the sealing ring (3), and the first sealing protrusion (321) is matched in the height difference gap (11) and seals the height difference gap.
  2. 2. Battery cap according to claim 1, characterized in that the peripheral edge of the explosion-proof valve (2) is bent in a direction towards the top cover (1) to form an annular limiting portion (21), the annular limiting portion (21) is arranged around the top cover (1) and below the peripheral edge of the top cover (1), and the level difference gap (11) is formed between the top of the annular limiting portion (21) and the peripheral edge of the top cover (1).
  3. 3. The battery cap according to claim 2, wherein the seal ring (3) includes a seal body portion (31) and a first bending portion (32), the seal body portion (31) is sleeved outside the annular limiting portion (21), and the first bending portion (32) is bent in a direction toward the top of the top cap (1) and is abutted against the top of the top cap (1); The first sealing protrusion (321) is provided on the inner wall of the sealing body portion (31) or the inner wall of the first bending portion (32).
  4. 4. A battery cap according to claim 3, wherein the first sealing protrusion (321) is provided on the inner wall of the first bending portion (32) and extends in a direction toward the top of the annular stopper portion (21).
  5. 5. The battery cap according to claim 4, wherein an end of the first sealing protrusion (321) facing the annular stopper portion (21) is disposed in contact with a top portion of the annular stopper portion (21), and a side of the first sealing protrusion (321) away from the top cover (1) is disposed in contact with an inner wall of the sealing main body portion (31), and a side of the first sealing protrusion (321) close to the top cover (1) is disposed in contact with an outer periphery of the top cover (1).
  6. 6. The battery cap according to claim 4, wherein the first sealing protrusion (321) is in interference fit with the level difference slit (11), wherein the level difference slit (11) has a height ranging from 0.05mm to 0.5mm and the first sealing protrusion (321) has a height ranging from 0.1mm to 0.8mm in an unassembled state of the sealing ring (3).
  7. 7. Battery cap according to any of claims 3 to 6, wherein the sealing ring (3) further comprises a second bending part (33), the second bending part (33) bending in a direction towards the bottom of the explosion-proof valve (2), the top surface of the second bending part (33) being arranged at a distance from the bottom of the explosion-proof valve (2); And a second sealing bulge (331) is arranged on the top surface of the second bending part (33), and the top of the second sealing bulge (331) is abutted against the bottom of the explosion-proof valve (2).
  8. 8. The battery cap according to claim 7, wherein the height of the second sealing protrusion (331) is larger than the distance between the second bending portion (33) and the explosion-proof valve (2), wherein the height of the second sealing protrusion (331) ranges from 0.1mm to 0.5mm when the sealing ring (3) is in an unassembled state.
  9. 9. The battery cap according to claim 7, wherein a fit gap is formed between the second sealing protrusion (331), the sealing main body portion (31) and the explosion-proof valve (2), and the fit gap is filled with a structural adhesive (4).
  10. 10. A battery, comprising: the battery cap according to any one of claims 1 to 9; Battery casing (7) and electric core subassembly (8), electric core subassembly (8) are installed the inside of battery casing (7), just battery lid cap is established the top of battery casing (7), wherein, battery casing (7) will sealing washer (3) compress tightly on top cap (1) with the surface of explosion-proof valve (2).

Description

Battery cap and battery Technical Field The utility model relates to the technical field of batteries, in particular to a battery cap and a battery. Background In the related art, in a conventional battery design, a battery cap generally includes a top cover and an explosion-proof valve. These components ensure the stability and safety of the internal environment of the battery by close fitting. However, in actual manufacturing processes, due to manufacturing process limitations or material characteristics, the assembly between the top cover and the explosion proof valve often results in a slight height difference, resulting in a height difference gap therebetween. In the prior art, a height difference between the top cover and the explosion-proof valve is unavoidable. This height differential can result in the presence of a gap that can be a potential leak point, affecting the overall sealing performance of the cell. Due to the presence of the level difference gap, the conventional sealing method may not provide a sufficient sealing effect. Even with conventional sealing rings, it is still difficult to effectively seal these gaps without special design for the height difference. The height difference gap not only affects the sealability of the battery, but also may cause foreign substances (such as moisture, dust, etc.) to enter the inside of the battery, thereby negatively affecting the safety and service life of the battery. This problem may be even more pronounced, especially in extreme environments. Disclosure of utility model In view of the above, the present utility model provides a battery cap and a battery to solve the problem of poor sealing performance of the battery in the related art. In a first aspect, the present utility model provides a battery cap comprising: The top cover is arranged at the top of the explosion-proof valve, and a height difference gap is formed between the peripheral edge of the top cover and the peripheral edge of the explosion-proof valve; The sealing ring is sleeved on the outer side of the top cover and the explosion-proof valve, a first sealing protrusion is arranged on the inner wall of the sealing ring and is matched in the height difference gap and seals the height difference gap. The sealing device has the beneficial effects that (1) the problem of the height difference gap is solved pertinently, the first sealing bulge is arranged on the inner wall of the sealing ring and is accurately embedded into the height difference gap between the top cover and the explosion-proof valve, so that the unavoidable manufacturing defect is effectively overcome, and the sealing performance of the whole structure is improved. (2) The safety and the reliability are improved, the better sealing design prevents foreign matters (such as moisture, dust and the like) from entering the battery, and the safety and the long-term stability of the battery under various use conditions are obviously improved. (3) The design with strong adaptability is that the first sealing bulge of the sealing ring has certain elastic compensation capability and can adapt to certain manufacturing tolerance and material deformation, so that the design scheme has stronger universality and adaptability and is suitable for products in different batches. In an alternative embodiment, the peripheral edge of the explosion-proof valve is curved in a direction toward the top cover to form an annular stopper portion which is disposed around the top cover and is lower than the peripheral edge of the top cover, and the height difference gap is formed between the top of the annular stopper portion and the peripheral edge of the top cover. The anti-explosion battery cap has the advantages that on one hand, the top cover can be firmly arranged on the anti-explosion valve through the design of the annular limiting part, the displacement risk caused by vibration or external impact is reduced, the stability of the whole battery cap structure is enhanced, and on the other hand, the height difference gap between the annular limiting part and the top cover is carefully designed, so that the first sealing protrusion can be perfectly embedded and a reliable sealing effect is provided, and the overall sealing performance is improved. In an alternative embodiment, the sealing ring comprises a sealing main body part and a first bending part, the sealing main body part is sleeved outside the annular limiting part, and the first bending part is bent in a direction towards the top of the top cover and is tightly attached to the top of the top cover; The first sealing protrusion is disposed on an inner wall of the sealing body portion or an inner wall of the first bending portion. The sealing structure has the beneficial effects that through the double sealing design of the sealing main body part and the first bending part, excellent sealing performance can be maintained even under a complex working environment, and external impurities ar