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CN-224232888-U - Single battery, battery pack and electric equipment

CN224232888UCN 224232888 UCN224232888 UCN 224232888UCN-224232888-U

Abstract

The application discloses a single battery, a battery pack and electric equipment, belonging to the technical field of power batteries, wherein the single battery comprises a cover plate component and a sealing ring, the cover plate assembly comprises a cover plate body, a first pole and a second pole, and the cover plate body is provided with a first assembly hole; the first pole is arranged on one side of the cover plate body and partially penetrates through the first assembly hole, the second pole comprises a connecting part, a first matching layer, a second matching layer and a third matching layer, the connecting part is arranged on one side of the third matching layer along the length direction of the cover plate body and connected with the third matching layer, the electrode assembly is connected with one side of the connecting part, which is away from the first pole, and the first matching layer penetrates through the first assembly hole and is connected with the first pole. The sealing ring is arranged at the joint of the first pole and the second pole and is abutted with the cover plate body. The space between the inner wall of the sealing ring and the outer wall of the first matching layer is G 1 , and G 1 is more than or equal to 0.05mm and less than or equal to 0.6mm. The embodiment improves the space utilization rate of the single battery.

Inventors

  • YUAN YUE

Assignees

  • 蜂巢能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250317

Claims (10)

  1. 1. A single cell, characterized by comprising: A housing having a receiving cavity; an electrode assembly disposed in the receiving chamber; The cover plate assembly comprises a cover plate body, a first pole and a second pole, wherein the cover plate body covers the accommodating cavity and is connected with the shell, the cover plate body is provided with a first assembly hole, the first pole is arranged on one side of the cover plate body, which is away from the electrode assembly, and is partially penetrated through the first assembly hole, the second pole is positioned in the accommodating cavity and comprises a connecting part, a first assembly layer, a second assembly layer and a third assembly layer, the first assembly layer, the second assembly layer and the third assembly layer are sequentially arranged in a step shape along the thickness direction of the cover plate body, the connecting part is arranged on one side of the third assembly layer along the length direction of the cover plate body and is connected with the third assembly layer, and the electrode assembly is connected with one side of the connecting part, which is away from the first pole, and the first assembly hole is penetrated through the first assembly layer and is connected with the first pole; The sealing ring is arranged at the joint of the first pole and the second pole and is abutted against the cover plate body; The space between the inner wall of the sealing ring and the outer wall of the first matching layer is G 1 mm, and G 1 is more than or equal to 0.05mm and less than or equal to 0.6mm.
  2. 2. The cell of claim 1, wherein the first post comprises: the first pole body is arranged on one side, away from the electrode assembly, of the cover plate body, and part of the first pole body penetrates through the first assembly hole; The boss is arranged on one side of the first pole body, facing the electrode assembly, and is connected with the first pole body, and part of the boss penetrates through the first assembly hole; The second pole is provided with a second assembly hole, the second assembly hole sequentially penetrates through the first matching layer, the second matching layer and the third matching layer along the thickness direction of the cover plate body, and part of the boss penetrates through the second assembly hole and is connected with the hole wall of the second assembly hole.
  3. 3. The unit cell according to claim 2, wherein the seal ring comprises: The first sealing part is arranged around the hole wall of the first assembly hole and is clamped between the boss and the hole wall of the first assembly hole; The second sealing part is arranged around the first sealing part and connected with the first sealing part, one side of the second sealing part, which is away from the electrode assembly, is respectively abutted with the cover plate body and the boss, and one side of the second sealing part, which is towards the electrode assembly, is abutted with the second matching layer.
  4. 4. A unit cell according to claim 3, wherein in the thickness direction of the cover plate body, the height of the first mating layer is T 1 , the height of the second mating layer is T 2 , the height of the third mating layer is T 3 mm, and the height of the connecting portion is T 4 mm, satisfying 1.2mm ∈t 1 ＝T 2 ＝T 3 ＝T 4 ∈2.0mm.
  5. 5. A unit cell according to claim 3, wherein in the thickness direction of the cover plate body, a height between a side end face of the second mating layer facing the first pole and a side end face of the first mating layer facing the first pole is H 1 mm, satisfying 0.6mm ∈h 1 ∈1.5mm.
  6. 6. A unit cell according to claim 3, wherein the first mating layer has a spacing of W 1 mm between its inner wall and its outer wall, satisfying 1.5mm ∈w 1 ∈2.3mm; The distance between the outer wall of the second matching layer and the outer wall of the first matching layer is W 2 mm, and W 2 is more than or equal to 2.8mm and less than or equal to 3.5mm; The distance between the outer wall of the third matching layer and the outer wall of the second matching layer is W 3 mm, and W 3 is less than or equal to 0.5mm and less than or equal to 1mm.
  7. 7. The unit cell according to claim 2, wherein the minimum aperture of the second fitting hole is Dmm, satisfying 1.5 mm≤d≤3 mm.
  8. 8. The unit cell according to claim 1, wherein the electrode assembly comprises: The electrode body is arranged in the accommodating cavity and is connected with the second pole; And one end of the electrode lug is connected with the electrode body, and the other end of the electrode lug is connected with one side of the connecting part, which faces the cover plate body.
  9. 9. A battery pack comprising the single cell according to any one of claims 1 to 8.
  10. 10. A powered device comprising a single cell as claimed in any one of claims 1 to 8 or comprising a battery pack as claimed in claim 9.

Description

Single battery, battery pack and electric equipment Technical Field The application belongs to the technical field of power batteries, and particularly relates to a single battery, a battery pack and electric equipment. Background With the increasing maturity of lithium ion battery technology, lithium ion batteries are widely used in the field of electric automobiles as power batteries. The structural part of the lithium ion battery is also an important component of the lithium ion power battery, not only provides guarantee for the lithium ion battery in terms of safety and reliability, but also gives consideration to the connection of the chemical system in the lithium ion battery and the external module so as to lead to Pack, and the structural part has various connection relations in the structural part and simultaneously needs to give consideration to the requirements of sealing performance and overcurrent performance, so the structural part is particularly heavy in design scheme. The electrode structure of the battery is generally formed by riveting and connecting a shell and a pole post and then welding with a connecting sheet, and the performance and the yield are low. And traditional riveting scheme, because receive instantaneous impulse during the riveting, seriously influence the stability of explosion-proof valve, owing to the existence of riveting piece again, seriously occupy axial space, space utilization is lower. Disclosure of utility model The embodiment of the application provides a single battery, which aims to improve the performance and yield of an electrode structure, and another aim of the embodiment of the application is to provide a battery pack, and still another aim of the embodiment of the application is to provide electric equipment. An embodiment of the present application provides a unit cell including: A housing having a receiving cavity; an electrode assembly disposed in the receiving chamber; The cover plate assembly comprises a cover plate body, a first pole and a second pole, wherein the cover plate body covers the accommodating cavity and is connected with the shell, the cover plate body is provided with a first assembly hole, the first pole is arranged on one side of the cover plate body, which is away from the electrode assembly, and is partially penetrated through the first assembly hole, the second pole is positioned in the accommodating cavity and comprises a connecting part, a first assembly layer, a second assembly layer and a third assembly layer, the first assembly layer, the second assembly layer and the third assembly layer are sequentially arranged in a step shape along the thickness direction of the cover plate body, the connecting part is arranged on one side of the third assembly layer along the length direction of the cover plate body and is connected with the third assembly layer, and the electrode assembly is connected with one side of the connecting part, which is away from the first pole, and the first assembly hole is penetrated through the first assembly layer and is connected with the first pole; The sealing ring is arranged at the joint of the first pole and the second pole and is abutted against the cover plate body; The space between the inner wall of the sealing ring and the outer wall of the first matching layer is G 1 mm, and G 1 is more than or equal to 0.05mm and less than or equal to 0.6mm. In some embodiments, the first pole comprises: the first pole body is arranged on one side, away from the electrode assembly, of the cover plate body, and part of the first pole body penetrates through the first assembly hole; The boss is arranged on one side of the first pole body, facing the electrode assembly, and is connected with the first pole body, and part of the boss penetrates through the first assembly hole; The second pole is provided with a second assembly hole, the second assembly hole sequentially penetrates through the first matching layer, the second matching layer and the third matching layer along the thickness direction of the cover plate body, and part of the boss penetrates through the second assembly hole and is connected with the hole wall of the second assembly hole. In some embodiments, the seal ring comprises: The first sealing part is arranged around the hole wall of the first assembly hole and is clamped between the boss and the hole wall of the first assembly hole; The second sealing part is arranged around the first sealing part and connected with the first sealing part, one side of the second sealing part, which is away from the electrode assembly, is respectively abutted with the cover plate body and the boss, and one side of the second sealing part, which is towards the electrode assembly, is abutted with the second matching layer. In some embodiments, in the thickness direction of the cover plate body, the height of the first matching layer is T 1, the height of the second matching layer is T 2, the height of the third