CN117855698B

CN117855698B - Shell assembly and battery

Info

Publication number: CN117855698B
Application number: CN202410259372.XA
Authority: CN
Inventors: 徐檑
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2024-03-07
Filing date: 2024-03-07
Publication date: 2024-05-24
Anticipated expiration: 2044-03-07
Also published as: CN117855698A

Abstract

The invention relates to the technical field of batteries, and discloses a shell assembly and a battery, wherein the shell assembly comprises: the shell body is formed by surrounding two first wall surfaces which are oppositely arranged and two second wall surfaces which are oppositely arranged together, the surface area of the second wall surfaces is larger than that of the first wall surfaces, and at least one mounting hole is formed in one of the first wall surfaces in a penetrating manner; the explosion-proof valve is arranged in the mounting hole; the first wall surface is in transitional connection with the adjacent second wall surface through an arc angle; in the direction perpendicular to the second wall surface, the minimum distance between the starting position of the arc angle adjacent to the first wall surface and the first step surface is f, and the minimum distance is as follows: f=a-b-R _{Outer part}.gtoreq.2.5 mm. The shell assembly provided by the invention can ensure that the explosion-proof valve is smoothly and correctly welded on the shell body, and meanwhile, the mounting hole is as large as possible, so that the valve opening area of the explosion-proof valve is increased.

Description

Shell assembly and battery

Technical Field

The invention relates to the technical field of batteries, in particular to a shell assembly and a battery.

Background

With the continuous development of technology, the requirements of users on new energy batteries are getting higher. In order to improve the safety performance of the battery monomer, an explosion-proof valve is usually arranged on the battery monomer, and when the battery monomer runs abnormally and generates gas inside, the gas can be discharged through the explosion-proof valve, so that a larger safety accident is avoided. The explosion-proof valve often sets up on the apron, because the utmost point post also sets up on the apron, and the explosion-proof valve is opened when electric core thermal runaway, and circuit position and explosion-proof valve pressure release position are same in one side, influence each other and the risk of blasting when having the pressure release. In the related art, this problem is solved by adjusting the explosion-proof valve from the cover plate to the side wall of the housing.

However, in order to ensure that the explosion-proof valve can be opened smoothly and has enough area for venting and pressure relief when the battery core is out of control, the area of the explosion-proof valve is required to be large enough, but the installation of the explosion-proof valve on the side with a narrow shell limits the size of the explosion-proof valve, particularly the width of the explosion-proof valve. In addition, in order to increase the capacity of the battery cell as much as possible, the housing of the battery cell is generally made thinner, which results in an increased difficulty in welding the explosion-proof valve to the housing. This results in the explosion-proof valve welded on the housing being difficult to meet the welding requirements while having a sufficiently large valve opening area, and also having the requirement of facilitating the airtight detection. The size of the explosion-proof valve and the size design failure of the shell are easy to occur in the product design stage, so that the explosion-proof valve is welded on the thinner shell, and the problems of poor welding, low yield and the like are also caused.

Disclosure of Invention

In view of the above, the present invention provides a housing assembly and a battery to solve the problem that it is difficult for an explosion-proof valve to have a sufficiently large valve opening area while satisfying the welding requirement.

In a first aspect, the present invention provides a housing assembly comprising:

The shell body is formed by surrounding two first wall surfaces which are oppositely arranged and two second wall surfaces which are oppositely arranged together, the surface area of the second wall surfaces is larger than that of the first wall surfaces, and at least one mounting hole is formed in one of the first wall surfaces in a penetrating manner;

The explosion-proof valve is arranged in the mounting hole;

the first wall surface is in transitional connection with the adjacent second wall surface through an arc angle;

a step part is formed around the mounting hole on one side of the shell body, which is close to the inner wall or the outer wall, in a direction perpendicular to the first wall surface, and the step part is suitable for supporting the explosion-proof valve; defining the side wall of the step part connected with the first wall surface as a first step surface;

In the direction perpendicular to the second wall surface, the minimum distance between the starting position of the arc angle adjacent to the first wall surface and the first step surface is f, and the minimum distance is as follows: f=a-b-R _{Outer part} is not less than 2.5mm; wherein a is the distance between the central axis of the shell body and the outer wall of the second wall surface on one side in the direction perpendicular to the second wall surface; b is the minimum distance between the central axis of the shell body and the first step surface in the direction perpendicular to the second wall surface; r _{Outer part} is the radius of the outer wall of the circular arc angle.

The beneficial effects are that: in order to ensure that the explosion-proof valve welded on the shell body has a sufficiently large valve opening area, can meet the welding requirement and has the requirement of being convenient for air tightness detection, the minimum distance f between the starting position of the arc angle adjacent to the first wall surface and the first step surface is required to be limited in size, so that the explosion-proof valve can be smoothly and correctly welded on the shell body, and meanwhile, the mounting hole can be as large as possible, so that the valve opening area of the explosion-proof valve is improved.

In an alternative embodiment, the wall thickness of the first wall surface provided with the mounting holes is c, the wall thickness of the first wall surface not provided with the mounting holes is d, and c is equal to or greater than d.

In an alternative embodiment, the wall thickness of the second wall is likewise d.

The beneficial effects are that: the wall thickness of the first wall surface of the shell body is c, the wall thicknesses of the other three wall surfaces are d, c is larger than or equal to d, the capacity of the battery cell can be improved as much as possible by making the wall thickness of the wall surface without the explosion-proof valve thinner, and the welding requirement of the explosion-proof valve and the shell body can be ensured and the welding difficulty is reduced by making the wall thickness of the wall surface with the explosion-proof valve thicker.

In an alternative embodiment, the length of the explosion-proof valve is L along the length direction of the housing body, and L is less than or equal to 10 x 2b.

In an alternative embodiment, the first wall is adapted to support the air tightness detection tool such that the air tightness detection tool is arranged opposite to the explosion proof valve to detect the air tightness of the explosion proof valve;

The supporting part of the airtight detection tool is abutted against the first wall surface, and a sealing ring is further arranged at the contact position of the supporting part and the first wall surface;

and/or the minimum distance f between the starting position of the arc angle adjacent to the first wall surface and the first step surface also satisfies the following conditions:

f is more than or equal to p/2+q+r+s; wherein p is the width of a welding mark formed by welding the explosion-proof valve and the first wall surface in the direction perpendicular to the second wall surface; q is the width of the sealing ring; r is the distance between the edge of the sealing ring and the welding edge in the direction vertical to the second wall surface; s is the distance between the edge of the sealing ring and the initial position of the arc angle adjacent to the first wall surface in the direction perpendicular to the second wall surface.

The beneficial effects are that: the distance f between the starting position of the arc angle adjacent to the first wall surface and the first step surface is also satisfied by limiting: f is more than or equal to p/2+q+r+s, thereby ensuring that the explosion-proof valve welded on the shell body has a large enough valve opening area, meeting the welding requirement and meeting the requirement of being convenient for air tightness detection.

In an alternative embodiment, in the direction perpendicular to the second wall surface, the width p of the welding mark formed by welding the explosion-proof valve and the first wall surface is within the range that p is more than or equal to 1mm; and/or the value range of the width q of the sealing ring is more than or equal to 1mm.

In an alternative embodiment, in the direction perpendicular to the second wall surface, the distance r between the edge of the sealing ring and the welding edge is within the range of r being more than or equal to 0.5mm; and/or in the direction perpendicular to the second wall surface, the distance s between the edge of the sealing ring and the initial position of the arc angle adjacent to the first wall surface is more than or equal to 0.5mm.

The beneficial effects are that: according to the air tightness detection requirement of the explosion-proof valve welded on the shell body, the width p of the welding mark is p more than or equal to 1mm; the width q of the sealing ring is at least q is more than or equal to 1mm; the distance r between the edge of the sealing ring and the edge of the welding mark needs to meet the requirement that r is more than or equal to 0.5mm, otherwise, the sealing ring is pressed on the welding mark, so that invalid detection is caused; the distance s between the edge of the sealing ring and the initial position of the arc angle adjacent to the first wall surface needs to meet the requirement that s is more than or equal to 0.5mm, otherwise, the sealing ring is pressed on the R angle, and the detection failure phenomenon occurs.

In an alternative embodiment, the width of the step is e in the direction perpendicular to the second wall surface and satisfies 0.1 mm.ltoreq.e < b.

The beneficial effects are that: the step part is formed on one side, close to the inner wall or the outer wall, of the shell body in a direction perpendicular to the first wall surface, surrounding the mounting hole, so that the step part supports the periphery of the explosion-proof valve, the explosion-proof valve can be conveniently and rapidly positioned, shaking of the explosion-proof valve is avoided, the explosion-proof valve is conveniently welded with the first wall surface, and meanwhile the explosion-proof valve is lapped with the step part, so that the explosion-proof valve can be prevented from leaking into the shell body.

In an alternative embodiment, the side wall of the step part, which is close to the mounting hole, is defined as a second step surface; in the direction perpendicular to the second wall surface, the minimum distance between the starting position of the arc angle adjacent to the first wall surface and the second step surface is g, and the minimum distance satisfies the following conditions: g=a-b-R _{Outer part} +e;

the value range of g satisfies the following conditions: g is more than or equal to 2.6mm.

The beneficial effects are that: by limiting the lower limit of the minimum distance g between the starting position where the arc angle abuts the first wall surface and the second step surface, it is possible to ensure that the explosion-proof valve has sufficient supporting strength after being overlapped with the step portion.

In a second aspect, the present invention also provides a battery comprising: the length of the battery ranges from 100mm to 600mm, and the width of the battery ranges from 50mm to 250mm; the height of the battery is 10mm-100mm; or the length of the battery is 600mm-1500mm, and the width of the battery is 50mm-250mm; the height of the battery is 10mm-100mm.

The beneficial effects are that: according to the battery provided by the embodiment of the invention, the size of the minimum distance f between the starting position of the arc angle adjacent to the first wall surface and the first step surface is limited, so that the explosion-proof valve welded on the shell body can be ensured to have a large enough valve opening area, the welding requirement can be met, the requirement of being convenient for air tightness detection is met, the explosion-proof valve can be smoothly and correctly welded on the shell body, the mounting hole can be as large as possible, the valve opening area of the explosion-proof valve is increased, and the supporting part of the air tightness detection tool can be ensured to be smoothly abutted on the first wall surface, so that the air tightness detection is finished.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a housing body of the present invention;

FIG. 2 is a schematic view of the explosion proof valve of the present invention mounted to a housing body;

FIG. 3 is a schematic cross-sectional view of a housing assembly of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3;

FIG. 5 is a schematic illustration of the partial enlarged state of FIG. 3;

FIG. 6 is a schematic diagram showing the mating state of the air tightness detection tool and the shell assembly;

FIG. 7 is an enlarged view of a portion of the housing body;

Fig. 8 is a schematic view of another embodiment of a housing body.

Reference numerals illustrate:

1. A housing body; 11. a first wall surface; 111. a mounting hole; 112. a step portion; 113. a first step surface; 114. a second step surface; 12. a second wall surface; 13. arc angle; 2. an explosion-proof valve; 3. an airtight detection tool; 31. a support part; 32. a seal ring; 4. and (5) welding and printing.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.

Embodiments of the present invention are described below with reference to fig. 1 to 8.

According to an embodiment of the present invention, in one aspect, there is provided a housing assembly including:

The shell body 1 is formed by surrounding two first wall surfaces 11 which are oppositely arranged and two second wall surfaces 12 which are oppositely arranged together, wherein the surface area of the second wall surfaces 12 is larger than that of the first wall surfaces 11, and at least one mounting hole 111 is formed in one first wall surface 11 in a penetrating manner;

An explosion-proof valve 2 mounted to the mounting hole 111;

the first wall surface 11 and the adjacent second wall surface 12 are in transitional connection through an arc angle 13;

a stepped portion 112 is formed around the mounting hole 111 at a side of the case body 1 near the inner wall or the outer wall in a direction perpendicular to the first wall surface 11, the stepped portion 112 being adapted to support the explosion-proof valve 2; defining a side wall of the step 112 connected to the first wall surface 11 as a first step surface 113;

In the direction perpendicular to the second wall surface 12, the minimum distance from the start position of the arc angle 13 abutting the first wall surface 11 to the first step surface 113 is f, and satisfies: f=a-b-R _{Outer part} is not less than 2.5mm; wherein a is the distance between the central axis of the shell body 1 and the outer wall of the second wall 12 on one side in the direction perpendicular to the second wall 12; b is the minimum distance between the central axis of the case body 1 and the first step surface 113 in the direction perpendicular to the second wall surface 12; r _{Outer part} is the radius of the outer wall of the arc angle 13.

As shown in fig. 1, the casing body 1 of the present embodiment is formed by bending a continuous plate material to form four end-to-end wall surfaces, the four wall surfaces include two first wall surfaces 11 which are oppositely disposed and two second wall surfaces 12 which are oppositely disposed, wherein the plate area of the second wall surfaces 12 is larger than the plate area of the first wall surfaces 11, at least one mounting hole 111 is formed through the first wall surfaces 11 with smaller area, and the explosion-proof valve 2 is disposed in the mounting hole 111.

Due to the limitation of the bending process, the first wall surface 11 and the adjacent second wall surface 12 are in transitional connection through the arc angle 13 in the direction perpendicular to the second wall surface 12. In order to ensure that the explosion-proof valve 2 welded to the case body 1 has a sufficiently large valve opening area, and can meet the welding requirement, and also has the requirement of facilitating the air tightness detection, it is necessary to size the minimum distance f between the starting position of the arc angle 13 adjacent to the first wall surface 11 and the first step surface 113, so that the explosion-proof valve 2 can be smoothly and correctly welded to the case body 1, and the mounting hole 111 can be made as large as possible, so as to increase the valve opening area of the explosion-proof valve 2.

It should be noted that the welding requirements mentioned above specifically refer to: f needs to have a sufficient distance, because the welding mark 4 is formed in the welding area of the explosion-proof valve 2 and the shell body 1, the welding mark 4 is half of theory on the explosion-proof valve side and the shell body side, the width of the welding mark 4 is about 1mm or more, and the distance of the welding mark 4 is 0.5mm or more when the welding mark 4 is half of the shell body 1, so that the f value on the shell body 1 needs to have a certain length to ensure welding so as to ensure good welding.

Furthermore, the above-mentioned air tightness detection requirements specifically refer to: when the sealing ring 32 on the welding tool is pressed on the wall surface of the shell body 1, one side must be a certain distance from the welding area, the other side cannot be pressed on the arc angle 13 of the shell body 1, and the sealing ring 32 has a certain width, so that f needs to have a certain distance in order to facilitate the air tightness detection. Otherwise, the air tightness is detected poorly, such as: if the seal ring 32 is pressed on the solder mark 4, the leak of the solder mark 4 cannot be detected as a defect, and if the seal ring is pressed on the arc angle 13, the seal ring cannot be pressed tightly, so that air leakage is easily caused; when the air tightness is detected, air leaks in the uncompacted place, and the good product can be detected as defective as waste.

In this embodiment, f satisfies f=a-b-R _{Outer part}, where a is a distance between the central axis of the case body 1 and the outer wall of the second wall 12 on one side in the direction perpendicular to the second wall 12. That is, in the direction perpendicular to the second wall surface 12, the interval between the outer walls of the second wall surface 12 of the case body 1 is 2a, and half of the dimension thereof is a.

B is the minimum distance between the central axis of the case body 1 and the first step surface 113 in the direction perpendicular to the second wall surface 12. Since the mounting holes 111 are symmetrically arranged with the central axis of the case body 1 in the direction perpendicular to the second wall 12, that is, in the direction perpendicular to the second wall 12, the width of the mounting holes 111 is 2b, and half of the dimension thereof is b. It should be noted that, as shown in fig. 5, in a direction perpendicular to the first wall surface 11, a stepped portion 112 is formed around the mounting hole 111 on a side of the case body 1 close to the inner wall, the stepped portion 112 being adapted to support the explosion-proof valve 2; the width 2b of the mounting hole 111 referred to herein is the width of the mounting hole 111 from which the step 112 is removed. The step 112 has a width e in a direction perpendicular to the second wall 12.

In some embodiments, as shown in connection with fig. 6, the first wall 11 is adapted to support the tightness detection tool 3 such that the tightness detection tool 3 is disposed opposite to the explosion proof valve 2 to detect tightness of the explosion proof valve 2;

The supporting part 31 of the airtight detection tool 3 is abutted against the first wall surface 11, and a sealing ring 32 is further arranged at the contact position of the supporting part 31 and the first wall surface 11;

and/or, the minimum distance f between the starting position of the arc angle 13 abutting the first wall surface 11 and the first step surface 113 also satisfies:

f is more than or equal to p/2+q+r+s; wherein p is the width of the welding mark 4 formed by welding the explosion-proof valve 2 and the first wall surface 11 in the direction perpendicular to the second wall surface 12; q is the width of the seal ring 32; r is the distance between the edge of the sealing ring 32 and the edge of the solder mark 4 in the direction perpendicular to the second wall 12; s is the distance between the edge of the sealing ring 32 and the starting position of the circular arc angle 13 adjacent to the first wall surface 11 in the direction perpendicular to the second wall surface 12.

In order to ensure that the explosion-proof valve 2 welded on the shell body 1 has a sufficiently large valve opening area, and can meet the welding requirement, and has the requirement of being convenient for air tightness detection, the size of f needs to be reasonably set so as to meet the minimum requirement when the air tightness detection tool 3 is assembled with the first wall surface 11. When the airtight detection tool 3 is assembled with the first wall surface 11, the supporting portion 31 of the airtight detection tool 3 needs to be abutted against the first wall surface 11, and through compacting the sealing ring 32, no air leakage between the airtight detection tool 3 and the first wall surface 11 can be ensured, so that the first wall surface 11 is crucial for good support of the airtight detection tool 3, wherein the supporting portion 31 of the airtight detection tool 3 needs to correspond to the position of the explosion-proof valve 2, the supporting portion 31 of the airtight detection tool 3 is not suitable to be abutted against the welding mark 4 formed by welding the explosion-proof valve 2 and the first wall surface 11, and meanwhile, the supporting portion 31 of the airtight detection tool 3 is not suitable to be abutted against the arc area of the arc angle 13, but is also suitable to be abutted against the flat plate surface area of the first wall surface 11.

Therefore, the minimum distance f between the start position of the arc angle 13 abutting the first wall surface 11 to the first step surface 113 is also satisfied by limiting: f is more than or equal to p/2+q+r+s, thereby ensuring that the explosion-proof valve 2 welded on the shell body 1 has a large enough valve opening area, meeting the welding requirement and meeting the requirement of being convenient for air tightness detection.

Since half of the welding and printing 4 is overlapped with the explosion-proof valve 2 and the other half is overlapped with the first wall surface 11, when f is calculated, the minimum requirement of f can be met by calculating p/2.

To meet the safety requirements of the explosion-proof valve 2, the area of the explosion-proof valve 2 needs to be made as large as possible, i.e., the area in the width direction 2b of the explosion-proof valve is made large enough, but the distance 2a between the outer walls of the second wall 12 of the case body 1 is limited in the direction perpendicular to the second wall 12, and the case has an arc angle 13, so f needs to be reduced as much as possible in the direction perpendicular to the second wall 12. However, since the region corresponding to f also needs to support the support portion 31 of the airtight detection tool 3, the lower limit value of f needs to be limited.

In some embodiments, in the direction perpendicular to the second wall surface 12, the width p of the welding mark 4 formed by welding the explosion-proof valve 2 and the first wall surface 11 is within the range that p is more than or equal to 1mm; and/or the width q of the sealing ring 32 is within the range that q is more than or equal to 1mm.

In some embodiments, in a direction perpendicular to the second wall 12, the distance r between the edge of the seal ring 32 and the edge of the solder mark 4 is in the range of r.gtoreq.0.5 mm; and/or, in the direction perpendicular to the second wall surface 12, the distance s between the edge of the sealing ring 32 and the initial position of the arc angle 13 adjacent to the first wall surface 11 is within the range of s being more than or equal to 0.5mm.

According to the air tightness detection requirement of the explosion-proof valve 2 welded on the shell body 1, the width p of the welding mark 4 is p more than or equal to 1mm; the width q of the sealing ring is at least q is more than or equal to 1mm; the distance r between the edge of the sealing ring 32 and the edge of the welding mark 4 needs to be more than or equal to 0.5mm, otherwise, the sealing ring is pressed on the welding mark, so that invalid detection is caused; the distance s between the edge of the sealing ring 32 and the initial position of the arc angle 13 adjacent to the first wall surface 11 needs to be more than or equal to 0.5mm, otherwise, the sealing ring presses on the R angle, and the detection failure phenomenon occurs.

Thus, it is required that f.gtoreq.0.5mm+0.5mm+1 mm+0.5mm=2.5 mm.

In this embodiment, the value of f may be 2.5mm, 3.0mm, 3.5mm, 4.0mm, or the like.

Optionally, the radius R _{Outer part} of the outer wall of the arc angle 13 should have a value range that satisfies: r _{Outer part} is more than or equal to 0.5mm. Specifically, the value may be selected to be 0.5mm or 1.0mm or 1.35mm or 1.45mm or 1.5mm, etc.

When f is more than or equal to 2.5mm, the shell assembly provided by the embodiment can meet the molding process requirement of the explosion-proof valve hole, and deformation of the second wall surface 12 and deformation of the inner wall of the first wall surface 11 during stamping are avoided.

In some embodiments, as shown in connection with FIG. 5, the wall thickness of the first wall 11 with the mounting holes 111 is c, the wall thickness of the first wall 11 without the mounting holes 111 is d, and c.gtoreq.d.

In some embodiments, as shown in connection with fig. 5, the wall thickness of the second wall 12 is also d.

Optionally, the wall thickness of the first wall 11 of the shell body 1 is c, the wall thicknesses of the remaining three wall surfaces are d, and c is greater than or equal to d, so that the capacity of the battery cell can be improved as much as possible by making the wall thickness of the wall surface without the explosion-proof valve 2 thinner, and the welding requirement of the explosion-proof valve 2 and the shell body 1 can be ensured by making the wall thickness of the wall surface with the explosion-proof valve 2 thicker, so that the welding difficulty is reduced.

The shell body 1 of the present embodiment can achieve a change in wall thickness by a punching process or an extrusion process.

In some embodiments, as shown in connection with fig. 1, the length of the explosion-proof valve 2 along the length direction of the casing body 1 is L, and L is less than or equal to 10×2b.

Because the length of the housing body 1 is limited, and considering the area requirement of the explosion-proof valve 2, in this embodiment, the length L of the explosion-proof valve 2 is made to satisfy the width of the explosion-proof valve 2 that is less than or equal to 10 times L, i.e. l.ltoreq.10×2b.

In some embodiments, as shown in fig. 5, a stepped portion 112 is formed around the mounting hole 111 on a side of the case body 1 near the inner wall in a direction perpendicular to the first wall surface 11, the stepped portion 112 being adapted to support the explosion-proof valve 2;

The width of the step 112 is e in the direction perpendicular to the second wall 12, and 0.1mm < e < b is satisfied.

In order to be convenient for install explosion-proof valve 2 at mounting hole 111, the direction at perpendicular to first wall 11 is formed with step portion 112 around mounting hole 111 in the one side that shell body 1 is close to inner wall or outer wall to make step portion 112 support the periphery of explosion-proof valve 2, can make things convenient for explosion-proof valve 2's swift location, avoid explosion-proof valve 2's rocking, so that explosion-proof valve 2 welds with first wall 11, overlap joint through explosion-proof valve 2 and step portion 112 simultaneously, can prevent that explosion-proof valve 2 from leaking into shell body 1 inside.

As a modification, as shown in fig. 8, a stepped portion 112 is formed around the mounting hole 111 on the side of the case body 1 close to the outer wall in the direction perpendicular to the first wall surface 11, and the explosion-proof valve 2 is welded to the first wall surface 11.

Optionally, when the explosion-proof valve 2 is in a lap joint state with the step part 112, the upper surface of the explosion-proof valve 2 does not exceed the upper surface of the first wall surface 11 in the direction perpendicular to the first wall surface 11, so that the explosion-proof valve 2 and an external structure are prevented from being scratched.

In some embodiments, as shown in connection with fig. 5, a sidewall of the stepped portion 112 adjacent to the mounting hole 111 is defined as a second stepped surface 114; in the direction perpendicular to the second wall surface, the minimum distance between the starting position of the arc angle 13 abutting the first wall surface 11 and the second step surface 114 is g, and satisfies: g=a-b-R _{Outer part} +e;

By limiting the lower limit of the distance g between the start position of the arc angle 13 abutting the first wall surface 11 and the second step surface 114, it is possible to ensure sufficient supporting strength of the explosion-proof valve 2 after overlapping with the step portion 112.

The housing assembly provided by the examples of the present invention was verified by several sets of test examples below in conjunction with table 1 below.

TABLE 1

Example 1: setting the value of a-b to be 3.85mm, setting the value of the radius R _{Outer part} of the outer wall of the arc angle 13 to be 1.35mm, obtaining that the value of the minimum distance f between the initial position of the arc angle 13 adjacent to the first wall surface 11 and the first step surface 113 in the direction perpendicular to the second wall surface 12 is 2.5mm, and carrying out air tightness detection on the shell assembly of the embodiment, wherein the conclusion is that the air tightness detection requirement can be met;

Example 2: setting the value of a-b to be 4.5mm, setting the value of the radius R _{Outer part} of the outer wall of the arc angle 13 to be 1.5mm, obtaining that the value of the minimum distance f between the initial position of the arc angle 13 adjacent to the first wall surface 11 and the first step surface 113 in the direction perpendicular to the second wall surface 12 is 3mm, and carrying out air tightness detection on the shell assembly of the embodiment, wherein the conclusion is that the air tightness detection requirement can be met;

Example 3: setting the value of a-b to be 5.1mm, setting the value of the radius R _{Outer part} of the outer wall of the arc angle 13 to be 1.6mm, obtaining that the value of the minimum distance f between the initial position of the arc angle 13 adjacent to the first wall surface 11 and the first step surface 113 in the direction perpendicular to the second wall surface 12 is 3.5mm, and carrying out air tightness detection on the shell assembly of the embodiment, wherein the conclusion is that the air tightness detection requirement can be met;

Example 4: setting the value of a-b to be 5.65mm, setting the value of the radius R _{Outer part} of the outer wall of the arc angle 13 to be 1.65mm, obtaining that the value of the minimum distance f between the initial position of the arc angle 13 adjacent to the first wall surface 11 and the first step surface 113 in the direction perpendicular to the second wall surface 12 is 4mm, and carrying out air tightness detection on the shell assembly of the embodiment, wherein the conclusion is that the air tightness detection requirement can be met;

Comparative example 1: setting the value of a-b to be 3.4mm, setting the value of the radius R _{Outer part} of the outer wall of the arc angle 13 to be 1.4mm, obtaining that the value of the minimum distance f between the initial position of the arc angle 13 adjacent to the first wall surface 11 and the first step surface 113 in the direction perpendicular to the second wall surface 12 is 2mm, and carrying out air tightness detection on the shell assembly of the embodiment, wherein the conclusion is that the air tightness detection requirement cannot be met;

comparative example 2: by setting the value of a-b to 3mm and setting the value of the radius R _{Outer part} of the outer wall of the arc angle 13 to 1.5mm, the minimum distance f between the starting position of the arc angle 13 adjacent to the first wall surface 11 and the first step surface 113 in the direction perpendicular to the second wall surface 12 is 1.5mm, and by performing the air tightness detection on the housing assembly of the present embodiment, it is concluded that the air tightness detection requirement cannot be satisfied.

According to an embodiment of the present invention, in another aspect, there is also provided a battery including: the length of the battery is 100-600 mm, and the width of the battery is 50-250 mm; the height of the battery is 10mm-100mm; or the length of the battery is 600mm-1500mm, and the width of the battery is 50mm-250mm; the height of the battery is 10mm-100mm.

The battery provided by the embodiment of the invention can ensure that the explosion-proof valve 2 welded on the shell body 1 has a large enough valve opening area and meets the welding requirement, and also has the requirement of being convenient for air tightness detection by limiting the size of the minimum distance f between the starting position of the arc angle 13 adjacent to the first wall surface 11 and the first step surface 113, so that the explosion-proof valve 2 can be smoothly and correctly welded on the shell body 1, and the mounting hole 111 can be as large as possible to improve the valve opening area of the explosion-proof valve 2 and ensure that the supporting part 31 of the air tightness detection tool 3 can be smoothly abutted on the first wall surface 11, thereby completing air tightness detection.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Although the embodiments of the present invention have been described with reference to the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the claims.

Claims

1. A housing assembly, comprising:

The shell body (1) is formed by encircling two first wall surfaces (11) which are oppositely arranged and two second wall surfaces (12) which are oppositely arranged together, the surface area of the second wall surfaces (12) is larger than that of the first wall surfaces (11), and at least one mounting hole (111) is formed in one of the first wall surfaces (11) in a penetrating manner;

An explosion-proof valve (2) mounted to the mounting hole (111);

The first wall surface (11) and the adjacent second wall surface (12) are in transitional connection through an arc angle (13);

A step part (112) is formed around the mounting hole (111) on one side, close to the inner wall or the outer wall, of the shell body (1) in a direction perpendicular to the first wall surface (11), and the step part (112) is suitable for supporting the explosion-proof valve (2); defining a side wall of the step part (112) connected with the first wall surface (11) as a first step surface (113);

In a direction perpendicular to the second wall surface (12), a minimum distance f from a start position of the arc angle (13) adjacent to the first wall surface (11) to the first step surface (113) is set to be f, and the minimum distance f satisfies: f=a-b-R _{Outer part} is not less than 2.5mm; wherein a is a distance between a central axis of the shell body (1) and an outer wall of the second wall surface (12) on one side in a direction perpendicular to the second wall surface (12); b is the minimum distance between the central axis of the shell body (1) and the first step surface (113) in the direction perpendicular to the second wall surface (12); r _{Outer part} is the radius of the outer wall of the arc angle (13);

the first wall surface (11) is suitable for supporting the airtight detection tool (3) so that the airtight detection tool (3) is arranged opposite to the explosion-proof valve (2) to detect the air tightness of the explosion-proof valve (2);

The supporting part (31) of the airtight detection tool (3) is abutted against the first wall surface (11), and a sealing ring (32) is further arranged at the contact position of the supporting part (31) and the first wall surface (11);

The minimum distance f between the starting position of the arc angle (13) adjacent to the first wall surface (11) and the first step surface (113) is also as follows:

f is more than or equal to p/2+q+r+s; wherein p is the width of a welding mark (4) formed by welding the explosion-proof valve (2) and the first wall surface (11) in the direction perpendicular to the second wall surface (12); q is the width of the sealing ring (32); r is the distance between the edge of the sealing ring (32) and the edge of the welding mark (4) in the direction perpendicular to the second wall surface (12); s is the distance between the edge of the sealing ring (32) and the starting position of the arc angle (13) adjacent to the first wall surface (11) in the direction perpendicular to the second wall surface (12).

2. The housing assembly according to claim 1, wherein the wall thickness of the first wall surface (11) provided with the mounting hole (111) is c, the wall thickness of the first wall surface (11) not provided with the mounting hole (111) is d, and c is equal to or larger than d.

3. A housing assembly according to claim 2, wherein the wall thickness of the second wall (12) is also d.

4. The housing assembly according to claim 1, wherein the length of the explosion-proof valve (2) is L along the length direction of the housing body (1) and L is less than or equal to 10 x 2b.

5. The housing assembly according to claim 1, characterized in that the width p of the weld (4) formed by welding the explosion-proof valve (2) with the first wall (11) in the direction perpendicular to the second wall (12) is in the range p being equal to or greater than 1mm; and/or the value range of the width q of the sealing ring (32) is more than or equal to 1mm.

6. The housing assembly according to claim 1, characterized in that the distance r between the edge of the sealing ring (32) and the edge of the weld (4) in the direction perpendicular to the second wall (12) is in the range r > 0.5mm; and/or in the direction perpendicular to the second wall surface (12), the distance s between the edge of the sealing ring (32) and the initial position of the arc angle (13) adjacent to the first wall surface (11) is more than or equal to 0.5mm.

7. The housing assembly according to any one of claims 1 to 4, wherein the step (112) has a width e in a direction perpendicular to the second wall (12) and satisfies 0.1mm +.e < b.

8. The housing assembly according to claim 7, wherein a side wall defining the step (112) adjacent to the mounting hole (111) is a second step surface (114);

In a direction perpendicular to the second wall surface (12), a minimum distance between a starting position of the arc angle (13) adjacent to the first wall surface (11) and the second step surface (114) is g, and the minimum distance satisfies the following conditions: g=a-b-R _{Outer part} +e;

9. A battery comprising a housing assembly according to any one of claims 1 to 8 and a pole set disposed within the housing assembly, the battery having a length ranging from 100mm to 600mm and a width ranging from 50mm to 250mm; the height of the battery is 10mm-100mm; or the length of the battery is 600mm-1500mm, and the width of the battery is 50mm-250mm; the height of the battery is 10mm-100mm.