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CN-224217672-U - Electric core, battery pack and electric equipment

CN224217672UCN 224217672 UCN224217672 UCN 224217672UCN-224217672-U

Abstract

The application discloses a battery cell, a battery pack and electric equipment, wherein the battery cell comprises a shell, a cover body, a pole column, a connecting sheet and an electrode assembly, the electrode assembly is arranged in the shell, the cover body covers the shell, the pole column penetrates through the cover body, the connecting sheet comprises a first connecting part and a second connecting part, the first connecting part is connected with the electrode assembly, the second connecting part is connected with the pole column, a welding area is arranged on one side of the second connecting part, which is far away from the pole column, the welding area is provided with a plurality of first concave structures which are distributed at intervals, the first concave structures are concave inwards from the surface of the connecting sheet to form a first side wall and a bottom wall, an included angle between the first side wall and the bottom wall is A, the width direction of the connecting sheet is the first direction, the maximum dimension of the bottom wall along the first direction is L0, the width of the second connecting part is D, and the width of the connecting part is less than or equal to 135 DEG, L0.05 x D is less than or equal to 0.1mm, and D is less than or equal to 20 mm. So that the light trapping effect can be formed when the laser irradiates the first concave structure, thereby improving the welding effect on the connecting sheet and the pole.

Inventors

  • Niu Huitong
  • HUANG PEIYUAN
  • LIU YAO
  • LUO SHIFANG

Assignees

  • 欣旺达动力科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250528

Claims (10)

  1. 1. The battery cell is characterized by comprising a shell (5), a cover body (2), a pole (3), a connecting sheet (1) and an electrode assembly (4); The shell (5) is provided with a containing cavity, the electrode assembly (4) is arranged in the containing cavity, the cover body (2) is connected to the shell (5) so as to cover the containing cavity, the pole (3) is arranged in the cover body (2) in a penetrating mode, the connecting piece (1) is arranged in the containing cavity, the connecting piece (1) comprises a first connecting part (1 a) and a second connecting part (1 b) which are connected with each other, the first connecting part is connected with the electrode assembly (4), the second connecting part (1 b) is connected with the pole (3), one side, deviating from the pole (3), of the second connecting part (1 b) is provided with a welding area (10), and the welding area (10) is provided with a plurality of first concave structures (11) which are distributed at intervals; The first concave structures (11) are concave inwards from the surface of the connecting sheet (1) to form a first side wall (111) and a bottom wall (112), an included angle between the first side wall (111) and the bottom wall (112) is A, the width direction of the connecting sheet (1) is a first direction (X), a plurality of concave structures are arranged at intervals along the first direction (X), the maximum size of the bottom wall (112) along the first direction (X) is L0, the width of the second connecting portion (1 b) is D, and the requirements that A is smaller than or equal to 90 degrees and smaller than or equal to 135 degrees, L0 is smaller than or equal to 0.05X D is smaller than or equal to 20mm and smaller than or equal to 100mm are met.
  2. 2. The cell according to claim 1, characterized in that the largest dimension L0 of the bottom wall (112) along the first direction (X) satisfies 0.1mm +.l0 +.1 mm.
  3. 3. The cell according to claim 1, wherein a spacing between two adjacent first recess structures (11) along the first direction (X) is L1, satisfying 0.1mm +.l1 +.0.05X d.
  4. 4. The cell of claim 1, wherein the bottom wall (112) is circular or square.
  5. 5. The battery cell according to claim 1, wherein a plurality of the first recess structures (11) are arranged in an array, and the distances between two adjacent first recess structures (11) are equal.
  6. 6. The cell according to any one of claims 1 to 5, wherein the connecting piece (1) has a second direction (Y) intersecting the first direction (X), a plurality of second recess structures (12) are further provided in the bonding region (10), the plurality of second recess structures (12) include a plurality of first strip-shaped grooves (121), the first strip-shaped grooves (121) extend along the first direction (X) and communicate with at least part of the first recess structures (11), and the plurality of first strip-shaped grooves (121) are arranged at intervals along the second direction (Y).
  7. 7. The cell of claim 6, wherein the plurality of second recess structures (12) further comprises a plurality of second bar-shaped grooves (122), the second bar-shaped grooves (122) extending along the second direction (Y) and communicating with at least a portion of the first recess structures (11), the plurality of second bar-shaped grooves (122) being arranged at intervals along the first direction (X).
  8. 8. The cell according to claim 1, characterized in that the orthographic projection of the terminal post (3) is located within the orthographic projection of the welding zone (10) in the thickness direction of the connecting piece (1).
  9. 9. A battery pack comprising the cell of any one of claims 1-8.
  10. 10. A powered device comprising a battery cell according to any of claims 1-8, or comprising a battery pack according to claim 9.

Description

Electric core, battery pack and electric equipment Technical Field The application belongs to the technical field of batteries, and particularly relates to a battery cell, a battery pack and electric equipment. Background The power battery has the characteristics of no pollution, high energy density, long service life and the like, and has been widely applied to the fields of electric automobiles and energy storage. Along with the continuous development of the power battery technology, higher requirements are also put on the manufacturing process of the power battery so as to reduce the manufacturing cost and the use safety of the power battery. In a power battery, a connection piece is generally used for carrying out electric connection between a tab and a pole of a battery core, and in the related art, connection and fixation between the connection piece and the pole are generally realized by adopting laser welding, however, as the surface of the connection piece is relatively smooth, reflection is easy to generate in the laser welding process, and defects such as cold welding are caused, so that the connection performance of the connection piece and the pole is influenced. Disclosure of utility model The application aims to provide a battery cell, a battery pack and electric equipment, which can solve the problems that the connection performance of a connecting sheet and a pole is affected due to the defects of easy cold welding and the like when the connecting sheet and the pole are welded in the conventional battery. In order to solve the technical problems, the application is realized as follows: in a first aspect, an embodiment of the present application provides an electrical core, including a housing, a cover, a post, a connecting piece, and an electrode assembly; The shell is provided with a containing cavity, the electrode assembly is arranged in the containing cavity, the cover body is connected to the shell to cover the containing cavity, the pole is arranged in the cover body in a penetrating mode, the connecting sheet is arranged in the containing cavity and comprises a first connecting portion and a second connecting portion which are connected with each other, the first connecting portion is connected with the electrode assembly, the second connecting portion is connected with the pole, a welding area is formed in one side, away from the pole, of the second connecting portion, and a plurality of first concave structures which are distributed at intervals are arranged in the welding area; The first concave structures are concave inwards from the surface of the connecting sheet to form a first side wall and a bottom wall, an included angle between the first side wall and the bottom wall is A, the width direction of the connecting sheet is a first direction, a plurality of concave structures are distributed at intervals along the first direction, the maximum dimension of the bottom wall along the first direction is L0, the width of the second connecting part is D, and the requirements are that 90 degrees < A is less than or equal to 135 degrees, 0.1mm is less than or equal to L0 is less than or equal to 0.05 times D, and 20mm is less than or equal to D is less than or equal to 100mm. Optionally, the largest dimension L0 of the bottom wall along the first direction is 0.1 mm≤L0≤1 mm. Optionally, along the first direction, the distance between two adjacent first concave structures is L1, and L1 is more than or equal to 0.1mm and less than or equal to 0.05 x D. Optionally, the bottom wall is circular or square. Optionally, the plurality of first concave structures are arranged in an array, and the intervals between two adjacent first concave structures are equal. Optionally, the connecting piece has with the crossing second direction of first direction, still be equipped with a plurality of second concave structure in the welded zone, a plurality of second concave structure includes a plurality of first bar recess, first bar recess along first direction extension and with at least part first concave structure intercommunication, a plurality of first bar recess is followed the second direction interval is arranged. Optionally, the plurality of second concave structures further include a plurality of second strip-shaped grooves, the second strip-shaped grooves extend along the second direction and are communicated with at least part of the first concave structures, and the plurality of second strip-shaped grooves are arranged at intervals along the first direction. Optionally, the orthographic projection of the pole is located in the orthographic projection of the welding area along the thickness direction of the connecting sheet. In a second aspect, an embodiment of the present application provides a battery pack, including the battery cell according to the first aspect. In a third aspect, an embodiment of the present application provides an electrical apparatus, including a battery cell according