Search

CN-224232743-U - Battery case and battery

CN224232743UCN 224232743 UCN224232743 UCN 224232743UCN-224232743-U

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery shell and a battery, wherein the battery shell comprises a shell body and an explosion-proof valve, the shell body comprises a first wall surface provided with a mounting hole, the explosion-proof valve comprises a plugging part and a connecting part, the connecting part is positioned outside the shell body and is abutted to the outer side of the first wall surface, the connecting part is connected with the shell body in a penetration welding mode, the planeness of the surface of the connecting part facing the first wall surface is not more than 0.2mm, and the planeness of the surface of the first wall surface facing the connecting part is not more than 0.3mm. The connecting part and the first wall surface are overlapped in space, and an additional welding area is not required to be reserved in a penetration welding mode, so that the explosion-proof valve is ensured to have enough opening area, and meanwhile, the explosion-proof valve and the shell body are ensured to have enough welding area, the welding difficulty is reduced, the joint flatness is limited, and the adverse phenomena of cold welding, welding holes and the like are avoided.

Inventors

  • SUN CHAO
  • ZHOU JIE
  • YANG CHAO
  • HU YUE
  • CHEN MIAOMIAO

Assignees

  • 蜂巢能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250422

Claims (10)

  1. 1. Battery housing, its characterized in that, battery housing includes: The shell comprises a shell body, wherein the shell body comprises a first wall surface, and a mounting hole is formed in the first wall surface; the explosion-proof valve comprises a plugging part and a connecting part, the plugging part is inserted into the mounting hole, the connecting part is positioned outside the shell body and is in butt joint with the outer side of the first wall surface, and the connecting part and the shell body are connected in a penetration welding mode; The flatness of the surface of the connecting portion facing the first wall surface is not more than 0.2mm, and the flatness of the surface of the first wall surface facing the connecting portion is not more than 0.3mm.
  2. 2. The battery case according to claim 1, wherein the thickness dimension of the connecting portion in the first direction is T1, satisfying 0.3 mm≤t1≤1 mm.
  3. 3. The battery case according to claim 1, wherein a width dimension of the connecting portion overlapping the first wall surface in the second direction is L1, and 0.5mm ∈l1+.1.5 mm is satisfied.
  4. 4. The battery housing of claim 1, wherein a side of the explosion-proof valve facing away from the first wall surface is provided with a first groove.
  5. 5. The battery housing of claim 4, wherein the explosion proof valve is further provided with a second recess within the first recess.
  6. 6. The battery case according to claim 5, wherein a width dimension of the mounting hole in the second direction is S, a width dimension of the first groove in the second direction is S1, a width dimension of the second groove in the second direction is S2, and 2mm + (S-S1)/2 + (S-S2)/2 is satisfied.
  7. 7. The battery housing of claim 6, wherein the explosion proof valve is further provided with a weakened structure disposed within the second recess.
  8. 8. The battery housing of claim 7, wherein the weakened structure is a scored groove extending in a first direction, the second groove being formed with a thickness less than a thickness of the second groove where the scored groove is not formed.
  9. 9. The battery housing of claim 1, wherein the first wall has a thickness dimension T2 in the first direction that satisfies 0.15mm ∈t2 +.2mm.
  10. 10. A battery, characterized in that the battery comprises a cover plate, a pole group and a battery housing as claimed in any one of claims 1 to 9, wherein the cover plate is arranged at an opening of the battery housing in a covering manner and seals the battery housing to form a containing cavity for containing the pole group.

Description

Battery case and battery Technical Field The utility model relates to the technical field of batteries, in particular to a battery shell and a battery. Background The battery case is an indispensable component constituting the battery, and it not only protects the battery from physical damage, but also ensures safe operation of the battery system. In order to improve the safety performance of the battery unit, the explosion-proof valve is usually arranged on the battery unit and is usually arranged on the cover plate, when the explosion-proof valve is opened due to thermal runaway of the battery core, the circuit component and the explosion-proof valve are arranged on the same side, and the risk of fire and explosion caused by mutual influence during pressure relief exists, so that the problem of mutual influence of the explosion-proof valve and the circuit component is solved by arranging the explosion-proof valve on the side wall of the shell. The explosion-proof valve needs to have enough area for ensuring smooth opening, but because the mounting area provided by the side wall of the shell for the explosion-proof valve is limited, the welding area of the explosion-proof valve and the side wall of the shell is narrow, the welding difficulty is high, and the strength after welding and the air tightness after welding are poor. Disclosure of utility model The utility model aims to provide a battery shell and a battery, which have the advantages of low welding difficulty, high welding strength and good welding air tightness. To achieve the purpose, the utility model adopts the following technical scheme: in one aspect, there is provided a battery case including: the battery case includes: The shell comprises a shell body, wherein the shell body comprises a first wall surface, and a mounting hole is formed in the first wall surface; the explosion-proof valve comprises a plugging part and a connecting part, the plugging part is inserted into the mounting hole, the connecting part is positioned outside the shell body and is in butt joint with the outer side of the first wall surface, and the connecting part and the shell body are connected in a penetration welding mode; The flatness of the surface of the connecting portion facing the first wall surface is not more than 0.2mm, and the flatness of the surface of the first wall surface facing the connecting portion is not more than 0.3mm. Optionally, the thickness dimension of the connecting portion along the first direction is T1, and T1 is more than or equal to 0.3mm and less than or equal to 1mm. Optionally, the width dimension of the connecting portion overlapping the first wall surface along the second direction is L1, and 0.5 mm-L1-1.5 mm is satisfied. Optionally, a first groove is formed on one side, away from the first wall surface, of the explosion-proof valve. Optionally, the explosion-proof valve is further provided with a second groove located in the first groove. Optionally, the width dimension of the mounting hole along the second direction is S, the width dimension of the first groove along the second direction is S1, the width dimension of the second groove along the second direction is S2, and the width dimension of the mounting hole along the second direction is more than or equal to 2mm and less than or equal to (S-S1)/2 and less than or equal to (S-S2)/2 is satisfied. Optionally, the explosion-proof valve is further provided with a weakening structure, and the weakening structure is arranged in the second groove. Optionally, the weakening structure is a notch groove extending along a first direction, and a thickness of the second groove where the notch groove is opened is smaller than a thickness of the second groove where the notch groove is not opened. Optionally, the thickness dimension of the first wall surface along the first direction is T2, and T2 which is smaller than or equal to 0.15mm and smaller than or equal to 2mm is satisfied. In another aspect, there is provided a battery comprising a cover plate, a pole group and a battery housing as described in any one of the above, the cover plate being disposed at an opening of the battery housing and closing the battery housing to form a receiving chamber for receiving the pole group. The utility model has the beneficial effects that: The utility model provides a battery shell, which comprises an explosion-proof valve formed by a plugging part and a connecting part, wherein the plugging part of the explosion-proof valve is inserted into a mounting hole on a first wall surface of a shell body, and the connecting part is connected to the outer side of the first wall surface in a penetration welding mode, so that the space utilization rate is improved, and in addition, in the penetration welding mode, an additional welding area is not required to be reserved, so that the explosion-proof valve is ensured to have enough opening area, the welding area between the explosion-proof valve and the shel