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CN-224217498-U - Battery monomer and battery package

CN224217498UCN 224217498 UCN224217498 UCN 224217498UCN-224217498-U

Abstract

The utility model relates to the technical field of new energy batteries and discloses a battery unit and a battery pack, wherein the battery unit comprises a shell, a cover plate and a limiting structure, the shell is provided with an accommodating cavity, the shell is provided with a first wall surface and a second wall surface, the cover plate covers the accommodating cavity along a third direction, the cover plate is provided with a first surface, a second surface and a third surface, the first surface is away from the shell along the third direction, the second surface is towards the shell along the third direction, the third surface is connected between the first surface and the second surface, the third surface is matched with a first wall surface in a stop mode, the limiting structure comprises a limiting groove and a limiting table, one of the first wall surface and the third surface is provided with the limiting groove, the other one of the first wall surface and the third surface is provided with the limiting table, and the limiting table is matched with the limiting groove in a stop mode along the first direction, the second direction and the third direction. Through two limiting, the matching stability of the cover plate and the shell during welding is improved, the distance and the height difference between the welding surfaces of the cover plate and the shell are controlled, and the laser welding quality is improved.

Inventors

  • AI XINHAI
  • YAN CHENGYU
  • LUO SHIFANG
  • LIU YAO

Assignees

  • 欣旺达动力科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250507

Claims (10)

  1. 1. A battery cell having first, second and third directions intersecting one another in pairs, the battery cell comprising: The shell is provided with a containing cavity, and the shell is provided with a first wall surface facing the containing cavity and a second wall surface facing away from the containing cavity; the cover plate is connected with the shell and covers the containing cavity along the third direction, the cover plate is provided with a first face, a second face and a third face, the first face faces away from the shell along the third direction, the second face faces towards the shell along the third direction, the third face is connected between the first face and the second face, and the third face is matched with the first wall surface in a stopping mode along the first direction and/or the second direction; the limiting structure comprises a limiting groove and a limiting table, wherein one of the first wall surface and the third surface is provided with the limiting groove, the other one of the first wall surface and the third surface is provided with the limiting table, the limiting table is embedded in the limiting groove, and the limiting table is matched with the limiting groove along the first direction, the second direction and the third direction in a stop mode.
  2. 2. The battery cell according to claim 1, wherein the third surface includes a first step surface, a second step surface, and a third step surface, the second step surface is connected between the first step surface and the third step surface, the third step surface is connected with the second surface, the second step surface is opposite to the housing along the third direction, the third step surface is in stop fit with the first wall surface, the limit groove is provided on the third step surface, the limit stand is provided on the first wall surface, or the limit stand is provided on the third step surface, the limit groove is provided on the first wall surface; The shell is further provided with an end face, the end face is arranged opposite to the cover plate along the third direction, and the second step face is lapped on the end face along the third direction.
  3. 3. The battery cell according to claim 2, wherein the limit groove has a first groove surface, a second groove surface, and a third groove surface, the first groove surface is disposed opposite to the first wall surface in the first direction and/or the second direction, the second groove surface is disposed opposite to the second step surface in the third direction, and the third groove surface intersects with the first groove surface and the second groove surface two by two; The limiting table is provided with a first limiting surface, a second limiting surface and a third limiting surface, the first limiting surface is attached to the first groove surface, the second limiting surface is attached to the second groove surface, and the third limiting surface is attached to the third groove surface.
  4. 4. The battery cell of claim 3, wherein the limit groove extends to the second step surface in the third direction, the limit table further having a top surface disposed opposite the second limit surface in the third direction, the top surface being flush with the end surface.
  5. 5. The battery cell according to claim 4, wherein a dimension between the first limit surface and the first wall surface is b, and a dimension between the first wall surface and the second wall surface is δ, 0.1+.b+.δ/2, in a direction perpendicular to the third direction; and along the direction perpendicular to the third direction, the dimension between the first groove surface and the third step surface is B, and B-B is more than or equal to 0 and less than or equal to 0.1.
  6. 6. The battery cell of claim 5, wherein a dimension between the first groove face and the first step face in a direction perpendicular to the third direction is a, -0.2 +.a- (δ+b) +.0.2.
  7. 7. The battery cell of claim 6, wherein a dimension between the second groove surface and the second step surface is H, and a dimension between the second limiting surface and the end surface is H, 0≤h-h≤0.1 in the third direction.
  8. 8. The battery cell of claim 7, wherein a dimension between the first face and the second face in the third direction is α, α/10+.h+.α/2.
  9. 9. The battery cell of any one of claims 1-8, wherein the housing and the cover plate are each provided with an R-angle, and the limiting groove and the limiting table are each provided at the R-angle.
  10. 10. A battery pack comprising the battery cell of any one of claims 1-9.

Description

Battery monomer and battery package Technical Field The utility model relates to the technical field of new energy batteries, in particular to a battery monomer and a battery pack. Background Square lithium batteries are a commonly used battery form in current battery packs, which have the advantage of high grouping efficiency. The lithium battery is generally formed by a shell, a cover plate and an electrode assembly, wherein the top of the shell is of an open structure, the shell provides an accommodating space for the internal structures such as the electrode assembly, the electrode assembly is arranged in the shell, the cover plate and the shell are connected to form a closed space, the electrode assembly and the like are sealed in the shell, and electrolyte leakage is avoided. The existing lithium battery is packaged by a laser welding process, and the joint between the shell and the cover plate is sealed by laser welding. When laser welding is performed, a welding surface gap, a height difference and the like matched between the shell and the cover plate directly affect the laser welding result. If the clearance and the height difference of the welding surface are larger due to the fact that the shell and the cover plate cannot be firmly matched, the welding quality between the shell and the cover plate can be affected, welding slag can fall into the shell during laser welding to enable the lithium battery to lose efficacy, and the safety performance of the lithium battery is affected. Disclosure of utility model The utility model aims to provide a battery monomer to solve the problem that a shell and a cover plate cannot be firmly matched when the cover plate and the shell are welded by laser in the lithium battery in the prior art, and also provides a battery pack. In order to achieve the above object, the present utility model provides a battery cell having a first direction, a second direction, and a third direction intersecting with each other, the battery cell comprising: The shell is provided with a containing cavity, and the shell is provided with a first wall surface facing the containing cavity and a second wall surface facing away from the containing cavity; the cover plate is connected with the shell and covers the containing cavity along the third direction, the cover plate is provided with a first face, a second face and a third face, the first face faces away from the shell along the third direction, the second face faces towards the shell along the third direction, the third face is connected between the first face and the second face, and the third face is matched with the first wall surface in a stopping mode along the first direction and/or the second direction; the limiting structure comprises a limiting groove and a limiting table, wherein one of the first wall surface and the third surface is provided with the limiting groove, the other one of the first wall surface and the third surface is provided with the limiting table, the limiting table is embedded in the limiting groove, and the limiting table is matched with the limiting groove along the first direction, the second direction and the third direction in a stop mode. Preferably, the third surface includes a first step surface, a second step surface and a third step surface, the second step surface is connected between the first step surface and the third step surface, the third step surface is connected with the second surface, the second step surface is opposite to the shell along the third direction, the third step surface is matched with the first wall surface in a stop mode, the limit groove is formed in the third step surface, the limit table is formed in the first wall surface, or the limit table is formed in the third step surface, and the limit groove is formed in the first wall surface; The shell is further provided with an end face, the end face is arranged opposite to the cover plate along the third direction, and the second step face is lapped on the end face along the third direction. Preferably, the limit groove is provided with a first groove surface, a second groove surface and a third groove surface, the first groove surface is opposite to the first wall surface along the first direction and/or the second direction, the second groove surface is opposite to the second step surface along the third direction, and the third groove surface is intersected with the first groove surface and the second groove surface in pairs; The limiting table is provided with a first limiting surface, a second limiting surface and a third limiting surface, the first limiting surface is attached to the first groove surface, the second limiting surface is attached to the second groove surface, and the third limiting surface is attached to the third groove surface. Preferably, along the third direction, the limiting groove extends to the second step surface, and the limiting table further has a top surface opposite to the second limi