Shell assembly for battery and battery

Abstract

The shell assembly comprises a shell and an anti-explosion piece, the shell comprises a first side plate, an exhaust hole is formed in the first side plate, and the anti-explosion piece is used for sealing the exhaust hole; the first side plate comprises a positioning part, the positioning part sinks towards the interior of the shell, and an exhaust hole is defined by the inner edge of the positioning part; the anti-explosion piece comprises a mounting part protruding towards the outside of the shell, the mounting part comprises a top wall and a side wall which are connected, the outer surface of the positioning part is connected with the top wall, and the side wall inclines from the top wall to the center of the exhaust hole. The outer surface of the positioning part is connected with the top wall, so that the explosion-proof sheet is conveniently and stably positioned and fixed. The side wall of the anti-explosion piece is provided with a certain inclination, the direction of welding residual stress of the first side plate and the anti-explosion piece is changed, transverse tensile stress on the nick of the anti-explosion piece is reduced, normal opening of the nick of the anti-explosion piece is better prevented from being affected by welding, and use safety is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of power batteries and energy storage batteries, and more specifically, to a housing assembly for a battery and a battery. Background Technology

[0002] Lithium-ion batteries are widely used in power batteries, energy storage batteries, and other technological fields. Power batteries provide power for tools and are typically used to power electric vehicles, electric trains, electric bicycles, golf carts, and other new energy vehicles, serving as core components. Energy storage batteries are commonly used in home energy storage, power stations for solar and wind power generation equipment, portable power supplies, communication base stations, and as batteries for storing renewable energy.

[0003] Lithium-ion battery explosion-proof pads are designed to cope with the sudden increase in internal pressure that may occur under abnormal conditions (such as overcharging, short circuit, thermal runaway, etc.), thereby preventing battery explosion or fire and ensuring safety. In existing technologies, the heat effect during welding, stress concentration, and mechanical constraints can easily interfere with the normal opening of the explosion-proof pad's grooves.

[0004] Therefore, there is an urgent need to provide a housing assembly and battery that can avoid affecting the normal opening of the explosion-proof plate markings and ensure safe use. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned defects in the existing technology and provide a housing assembly, including:

[0006] The housing includes a first side plate, and the first side plate is provided with an exhaust hole;

[0007] Explosion-proof discs are used to seal vent holes;

[0008] The first side plate includes a positioning part, which is recessed into the housing, and the inner edge of the positioning part surrounds and forms an exhaust hole.

[0009] The explosion-proof plate includes a mounting part that protrudes outward from the housing. The mounting part includes a top wall and a side wall that are connected to each other. The outer surface of the positioning part is connected to the top wall, and the side wall is inclined from the top wall toward the center of the vent hole.

[0010] This utility model also discloses a battery, comprising:

[0011] Housing assembly, wherein the housing assembly is the housing assembly described above;

[0012] A battery cell is disposed within the housing assembly, the housing assembly including terminals, and the battery cell is electrically connected to the terminals.

[0013] Implementing the embodiments of this utility model will have the following beneficial effects:

[0014] This utility model's explosion-proof disc includes a mounting portion protruding outward from the housing. The mounting portion includes a connected top wall and side wall. The outer surface of the positioning portion is connected to the top wall, facilitating stable positioning and fixing of the explosion-proof disc. By setting a certain slope on the side wall of the explosion-proof disc, the direction of residual stress from welding the first side plate to the explosion-proof disc is changed, reducing lateral tensile stress on the scoring of the explosion-proof disc. This better prevents welding from affecting the normal opening of the scoring of the explosion-proof disc, ensuring safe use. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] in:

[0017] Figure 1 An axial view of the housing in the housing assembly provided in this embodiment of the utility model;

[0018] Figure 2 Figure 1 An enlarged schematic diagram of region N in the middle;

[0019] Figure 3 An axial view of a housing assembly provided in an embodiment of this utility model;

[0020] Figure 4 Figure 3 A cross-sectional view along line A-A' in the middle;

[0021] Figure 5 Figure 3 A cross-sectional view along the B-B' direction;

[0022] Figure 6 Figure 3 Another cross-sectional view along the B-B' direction;

[0023] Figure 7 Figure 3 Another cross-sectional view along the B-B' direction;

[0024] Figure 8 Figure 3 A cross-sectional view along the C-C' direction;

[0025] Figure 9 Another axial view of the housing assembly provided in an embodiment of this utility model.

[0026] 1-Housing, 11-First side plate, 111-Exhaust port, 112-Positioning part, 113-Mounting hole, 12-Second side plate, 121-Protrusion, 13-Third side plate, 14-Fourth side plate, 15-Positioning structure, 151-First settlement step, 152-Bending part, 153-Second settlement step, 154-Third settlement step, 2-Explosion-proof plate, 21-Mounting part, 211-Top wall, 212-Side wall, 3-Top cover, 4-Bottom plate, 5-Pole post, 6-Protective patch, 7-Upper insulating component, 8-Sealing component, 9-Lower insulating component. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Combination Figure 3 , Figure 4 The present invention discloses a housing assembly, including: a housing 1 and an explosion-proof sheet 2. The housing 1 includes a first side plate 11, and the first side plate 11 is provided with an exhaust hole 111. The explosion-proof sheet 2 is used to seal the exhaust hole 111.

[0029] The first side plate 11 includes a positioning part 112, which is recessed into the housing 1, and the inner edge of the positioning part 112 forms an exhaust hole 111.

[0030] The explosion-proof plate 2 includes a mounting part 21 protruding outward from the housing 1. The mounting part 21 includes a top wall 211 and a side wall 212 connected to each other. The outer surface of the positioning part 112 is connected to the top wall 211, and the side wall 212 is inclined from the top wall 211 toward the center of the vent 111.

[0031] Furthermore, a protective patch 6 is provided on the outer surface of the first side plate 11, and an mounting hole 113 is formed by the inner edge of the positioning part 112, with the protective patch 6 covering the mounting hole 113. In this embodiment, the height of the outer surface of the positioning part 112 is lower than the height of the outer surface of the first side plate 11, leaving sufficient space to attach the protective patch 6 without affecting the normal opening of the explosion-proof sheet 2. During the installation of the explosion-proof sheet 2, the thickness of the top wall 211 can be equal to the depth of the recess in the positioning part 112, or it can be within a range of 0.2mm lower or higher than the depth of the recess in the positioning part 112, allowing for normal welding without explosions or air leakage.

[0032] Understandably, the first side plate 11 is provided with a positioning part 112, which is a step with an L-shaped cross-section; the explosion-proof sheet 2 is provided with a mounting part 21, and the outer surface of the positioning part 112 is connected to the top wall 211, which facilitates stable installation and fixation of the explosion-proof sheet 2. By setting a certain slope, the side wall 212 of the explosion-proof sheet 2 changes the direction of the residual stress from the welding between the first side plate 11 and the explosion-proof sheet 2, reduces the lateral tensile stress on the scoring of the explosion-proof sheet 2, and better avoids the welding affecting the normal opening of the scoring of the explosion-proof sheet 2.

[0033] In some alternative embodiments, combined with Figure 1 , Figure 3 The housing assembly also includes a top cover 3 and a bottom plate 4, which respectively seal both ends of the housing 1. Only the top cover 3 is provided with a terminal post 5. The terminal post 5 includes a positive terminal post and a negative terminal post, both of which are located on the top cover 3.

[0034] Furthermore, combined Figures 1-3 The housing 1 also includes a second side plate 12, a third side plate 13, and a fourth side plate 14. The first side plate 11, the second side plate 12, the third side plate 13, and the fourth side plate 14 are connected in sequence to form the housing 1. The second side plate 12 and the fourth side plate 14 are provided with a plurality of protrusions 121 or grooves (not shown in the figure) near the ends of the top cover 3. The protrusions 121 protrude along the thickness direction of the second side plate 12, and the grooves are recessed along the thickness direction of the second side plate 12. In this embodiment, the protrusions 121 provide support for the installation of the top cover 3.

[0035] Optionally, the second side plate 12, the third side plate 13, and the fourth side plate 14 are integrally formed and then bent into a U-shaped shell. The ends of the second side plate 12 and the fourth side plate 14 are respectively provided with bent short sides (not shown in the figure) that bend inward into the shell 1. The first side plate 11 overlaps with the bent short sides, which support the first side plate 11 and facilitate welding of the first side plate 11 to the U-shaped shell. The explosion-proof sheet 2 and the first side plate 11 can be formed separately and the explosion-proof sheet 2 can be welded to the first side plate 11; or the explosion-proof sheet 2 can be integrally formed with the first side plate 11 to reduce assembly steps.

[0036] Optionally, the first side plate 11, the second side plate 12, the third side plate 13 and the fourth side plate 14 are integrally formed to form the shell 1. At the same time, the first side plate 11 is integrally formed with the explosion-proof sheet 2, that is, the shell 1 and the explosion-proof sheet 2 are integrally formed, which reduces the assembly steps and makes the shell assembly simple and easy to assemble.

[0037] Furthermore, the housing 1 and the base plate 4 are engaged by the positioning structure 15.

[0038] Optional, refer to Figure 5The end of the housing 1 is provided with a first settling step 151 that protrudes towards the bottom plate 4 and is recessed into the housing 1. The bottom plate 4 engages with the first settling step 151, which is the positioning structure 15.

[0039] That is, the first side plate 11, the second side plate 12, the third side plate 13 and the fourth side plate 14 all have a first settling step 151 at their ends, and the bottom of the shell 1 forms a complete ring of steps. After the shell 1 is formed, the bottom plate 4 is first assembled onto the shell 1 and welded. The first settling step 151 serves to position and support the bottom plate 4, and can also prevent the weld from falling into the cell or prevent the weld from burning through the cell.

[0040] Optional, refer to Figure 6 The outer circumferential surface of the base plate 4 is provided with a second settling step 153 that is recessed into the interior of the shell 1. The shell 1 includes a bent portion 152, which extends from the end of the shell 1 toward the base plate 4 and engages with the second settling step 153. The bent portion 152 and the second settling step 153 constitute a positioning structure 15.

[0041] Specifically, the first side plate 11, the second side plate 12, the third side plate 13, and the fourth side plate 14 all include bent portions 152 at their ends, and the bottom of the housing 1 forms a full circle of inwardly bent portions 152, which facilitates the assembly and welding of the base plate 4. At the same time, when assembling bare cells, it can also pad the bottom R-angle of the housing 1, which can increase the internal space of the cell and increase its capacity. The connection between the base plate 4 and the housing 1 can be achieved by seam welding or through welding.

[0042] Optional, refer to Figure 7 The inner surface of the base plate 4 is provided with a third settling step 154 ​​that is recessed to the outside of the shell 1. The shell 1 is engaged with the third settling step 154, which is the positioning structure 15.

[0043] The bottom plate 4 has a third settling step 154 ​​at the ends of the first side plate 11, the second side plate 12, the third side plate 13 and the fourth side plate 14. That is, the bottom plate 4 has a full circle of steps on the inner side, which can support the shell 1 and also serve as a limiting structure for the shell 1. The shell 1 and the bottom plate 4 are side-welded to achieve a welding sealing effect.

[0044] Furthermore, referring to Figure 8 The top cover 3 directly overlaps and seals the end of the housing 1.

[0045] During the installation of the housing assembly, the housing 1 and the base plate 4 are welded first, then the battery cells are installed inside the housing 1, and finally the top cover 3 is sealed. The housing 1 and the base plate 4 can be engaged by the positioning structure 15. When welding the base plate 4, the housing 1 and the base plate 4 are supported by a fixture inside the housing 1 before welding. When welding the top cover 3, the battery cells are already assembled inside the housing 1, so a fixture cannot be used. Therefore, the top cover 3 is directly overlapped with the end of the housing 1, and the top cover 3 is placed on the outside of the housing 1. The top cover 3 is slightly smaller than the housing 1 to facilitate external welding.

[0046] Optionally, terminal 5 includes a positive terminal and a negative terminal, as shown in the reference. Figure 9 The positive and negative terminals can be respectively set on the top cover 3 and the bottom plate 4. The top cover 3 and the bottom plate 4 are directly overlapped with the ends of the housing 1 and then welded. Multiple protrusions 121 or grooves are provided on both ends of the housing 1 near the top cover 3 and the bottom plate 4.

[0047] This utility model also discloses a battery, including a housing assembly and a battery cell (not shown in the figure) of any one of the above embodiments; the battery cell is disposed in the housing assembly, the housing assembly includes a terminal post 5, and the battery cell is electrically connected to the terminal post 5.

[0048] Specifically, the battery also includes an upper insulating member 7, a sealing member 8, and a lower insulating member 9, for example, Figure 8 The lower insulating component 7 abuts against the inner surface of the top cover 3. The sealing component 8 is sleeved on the outside of the pole post 5, and the pole post 5 is located between the lower insulating component 9 and the pole post 5. The upper insulating component 7 is located on the outer surface of the top cover 3 and extends between the top cover 3 and the pole post 5. The upper insulating component 7 is connected to the sealing component 8. The pole post 5 is fixed by riveting or flipping.

[0049] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A housing assembly for a battery, characterized by, include: The housing includes a first side plate, on which an exhaust hole is provided; Explosion-proof sheet, the explosion-proof sheet being used to seal the vent hole; The first side plate includes a positioning part, which is recessed into the housing, and the inner edge of the positioning part surrounds and forms the exhaust hole; The explosion-proof plate includes a mounting portion protruding outward from the housing. The mounting portion includes a top wall and a side wall connected together. The outer surface of the positioning portion is connected to the top wall. The side wall is inclined from the top wall toward the center of the exhaust port.

2. The housing assembly of claim 1, wherein, The housing assembly also includes a top cover and a bottom plate, which respectively seal both ends of the housing, and the top cover is provided with a pole post.

3. The housing assembly of claim 2, wherein, The housing further includes a second side plate, a third side plate, and a fourth side plate, wherein the first side plate, the second side plate, the third side plate, and the fourth side plate are connected in sequence to form the housing; The second side plate and the fourth side plate are respectively provided with a plurality of protrusions or grooves at the ends near the top cover. The protrusions protrude along the thickness direction of the second side plate, and the grooves are recessed along the thickness direction of the second side plate.

4. The housing assembly of claim 2, wherein, The housing and the base plate are engaged by a positioning structure.

5. The housing assembly of claim 4, wherein, The end of the housing is provided with a first settling step that protrudes into the bottom plate and is recessed into the housing. The bottom plate engages with the first settling step, which serves as the positioning structure.

6. The housing assembly of claim 4, wherein, The outer circumferential surface of the base plate is provided with a second settling step that is recessed into the interior of the shell. The shell includes a bent portion that extends from the end of the shell toward the base plate and engages with the second settling step. The bent portion and the second settling step together constitute the positioning structure.

7. The housing assembly of claim 4, wherein, The inner surface of the base plate is provided with a third settling step that is recessed towards the outside of the shell. The shell engages with the third settling step, which serves as the positioning structure.

8. The housing assembly of claim 1, wherein, The outer surface of the first side plate is also provided with a protective patch, and the outer edge of the positioning part surrounds to form a mounting hole, and the protective patch covers the mounting hole.

9. The housing assembly of claim 1, wherein, The housing and the explosion-proof sheet are integrally formed.

10. A battery, characterized by include: A housing assembly, wherein the housing assembly is the housing assembly according to any one of claims 1 to 9; A battery cell is disposed within the housing assembly, the housing assembly including terminals, and the battery cell is electrically connected to the terminals.

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