CN-224232878-U - Single battery, battery pack and electric equipment

CN224232878UCN 224232878 UCN224232878 UCN 224232878UCN-224232878-U

Abstract

The application discloses a single battery, a battery pack and electric equipment, and belongs to the technical field of power batteries; the electrode assembly is arranged in the accommodating cavity, the cover plate assembly comprises a cover plate body, a pole post and a connecting piece, 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 pole post penetrates through the first assembly hole to be connected with the connecting piece, the connecting piece comprises a first connecting portion and a second connecting portion which are connected, the first connecting portion penetrates through the first assembly hole to be connected with the pole post, part of the second connecting portion can be bent at an angle of theta relative to the first connecting portion to meet the condition that the angle of theta is more than or equal to 0 and less than or equal to 90 degrees, one side, away from the electrode assembly, of the electrode assembly is connected with one side, away from the second connecting portion, of the electrode assembly, and the sealing ring is arranged at the joint of the pole post and the connecting piece and is in butt joint with the cover plate body. The embodiment improves the space utilization rate of the single battery while arranging the connecting piece to realize the electric connection between the electrode assembly and the pole.

Inventors

YUAN YUE
MA LIANG
ZHAO LE
WANG LITAO

Assignees

蜂巢能源科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250317

Claims (10)

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 pole column and a connecting piece, wherein the cover plate body covers the accommodating cavity and is connected with the shell, and the cover plate body is provided with a first assembly hole, the pole column penetrates through the first assembly hole and is connected with the connecting piece, the connecting piece comprises a first connecting part and a second connecting part which are connected, the first connecting part penetrates through the first assembly hole and is connected with the pole column, part of the second connecting part can be bent at an angle of theta relative to the first connecting part to meet the condition that the angle of theta is more than or equal to 0 and less than or equal to 90 degrees, and the electrode assembly is connected with one side of the second connecting part, which is away from the electrode assembly; The sealing ring is arranged at the joint of the pole and the connecting piece and is abutted with the cover plate body.
2. The unit cell according to claim 1, wherein the second connection part comprises: a first body disposed at a side of the first connection part facing the electrode assembly and connected with the first connection part; The second body is arranged on two sides of the first body along the width direction of the cover plate body and is connected with the first body, and the second body is electrically connected with the electrode assembly; The bending part is arranged between the first body and the second body, and is respectively connected with the first body and the second body, and the bending part drives the second body to bend by theta degrees relative to the first body.
3. The unit cell according to claim 2, wherein the second connection part has a through hole penetrating the bending part, the bending part being deformed by the through hole to bend the second body at an angle of θ with respect to the first body toward the electrode assembly.
4. The cell as defined in claim 1, wherein the post comprises: The pole body is arranged on one side of the cover plate body, which is away from the electrode assembly; The lug is arranged on one side of the pole body, facing the electrode assembly, and is connected with the pole body, and part of the lug penetrates through the first assembly hole; The cover plate assembly is provided with a second assembly hole, the second assembly hole penetrates through the connecting piece along the thickness direction of the cover plate body, and part of the protruding block penetrates through the second assembly hole and is connected with the hole wall of the second assembly hole.
5. The battery cell as defined in claim 4, wherein the first connection portion comprises: The first matching layer is partially penetrated through the first assembly hole and connected with the convex block, one side end face of the first matching layer, facing the pole, is abutted with the pole, and one side of the first matching layer, facing the wall of the first assembly hole, is abutted with the sealing ring; The second matching layer is connected with the first matching layer, and the outer wall of the second matching layer is abutted with the sealing ring; The third matching layer is connected with the second matching layer, and one side end face of the third matching layer, which faces the pole, is abutted against the sealing ring; The first matching layer, the second matching layer and the third matching layer are sequentially arranged in a step shape along the thickness direction of the cover plate body, and the second matching hole penetrates through the first matching layer, the second matching layer and the third matching layer.
6. The cell according to claim 5, wherein the seal ring comprises: The first sealing layer is arranged at the joint of the pole column and the connecting piece, the inner wall of the first sealing layer is in butt joint with the outer wall of the first matching layer, and the outer wall of the first sealing layer is in butt joint with the hole wall of the first assembly hole; The connecting part is arranged along the thickness direction of the cover plate body, one end of the connecting part is connected with the first sealing layer, one side of the connecting part, which faces towards the connecting piece, is abutted against the outer wall of the second matching layer, and one side of the connecting part, which faces away from the connecting piece, is abutted against the hole wall of the first assembly hole; The second sealing layer is connected with the other end of the connecting part, the inner wall of the second sealing layer is abutted with the outer wall of the second matching layer, and the second sealing layer is abutted with the cover plate body towards one side end face of the pole.
7. The single battery according to claim 5, wherein in the thickness direction of the cover plate body, the first matching layer has a height of T 1 mm which is 1.2mm or less and T 1 is 2.5mm or less, the second matching layer has a height of T 2 mm which is 1.2mm or less and T 2 is 2.5mm or less, the third matching layer has a height of T 3 mm which is 1.2mm or less and T 3 is 2.5mm or less, and the second connecting portion has a height of T 4 mm which is 0.2mm or less and T 4 is 1.8mm or less.
8. The cell of claim 1, further comprising an upper plastic disposed between the post and the cover body, and a portion of the upper plastic surrounding the outer periphery of the post.
9. A battery pack comprising the single cell according to any one of claims 1 to 8.
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 battery is generally casing and utmost point post riveting connection, and then with the connection piece welding, performance and yield are lower, and traditional riveting scheme, because receive instantaneous impulsive force 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 pole column and a connecting piece, wherein the cover plate body covers the accommodating cavity and is connected with the shell, and the cover plate body is provided with a first assembly hole, the pole column penetrates through the first assembly hole and is connected with the connecting piece, the connecting piece comprises a first connecting part and a second connecting part which are connected, the first connecting part penetrates through the first assembly hole and is connected with the pole column, part of the second connecting part can be bent at an angle of theta relative to the first connecting part to meet the condition that the angle of theta is more than or equal to 0 and less than or equal to 90 degrees, and the electrode assembly is connected with one side of the second connecting part, which is away from the electrode assembly; The sealing ring is arranged at the joint of the pole and the connecting piece and is abutted with the cover plate body. In some embodiments, the second connection portion comprises: a first body disposed at a side of the first connection part facing the electrode assembly and connected with the first connection part; The second body is arranged at two sides of the first body along the width direction of the cover plate body and is connected with the first body, and the second body is electrically connected with the electrode assembly; The bending part is arranged between the first body and the second body, and is respectively connected with the first body and the second body, and the bending part drives the second body to bend by theta degrees relative to the first body. In some embodiments, the second connection part has a through hole penetrating the bending part, and the bending part is deformed by the through hole to bend the second body by θ ° toward the electrode assembly with respect to the first body. In some embodiments, the pole comprises: The pole body is arranged on one side of the cover plate body, which is away from the electrode assembly; The lug is arranged on one side of the pole body, facing the electrode assembly, and is connected with the pole body, and part of the lug penetrates through the first assembly hole; The cover plate assembly is provided with a second assembly hole, the second assembly hole penetrates through the connecting piece along the thickness direction of the cover plate body, and part of the protruding block penetrates through the second assembly hole and is connected with the hole wall of the second assembly hole. In some embodiments, the first connection portion includes: The first matching layer is partially penetrated through the first assembly hole and connected with the convex block, one side end face of the first matching layer, facing the pole, is abutted with the pole, and one side of the first matching layer, facing the wall of the first assembly hole, is abutted with the sealing ring; The second matching layer is connected with the first matching layer