Battery shell and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a shell body and an anti-explosion valve, the shell body comprises a first wall surface provided with a mounting hole, the anti-explosion valve comprises an insertion part and a limiting part, the insertion part is inserted in the mounting hole, the limiting part abuts against the inner side of the first wall surface, and the first wall surface is provided with an opening; the explosion-proof valve and the shell body are welded to form a welding area, the overlapping size of the welding area and the inserting part in the first direction is L1, the overlapping size of the welding area and the limiting part in the first direction is L2, the thickness size of the first wall face in the first direction is h, and (L1 + L2) / h is larger than or equal to 1.5. According to the explosion-proof valve shell, the space overlapping of the limiting part and the first wall surface ensures that the explosion-proof valve and the shell body have enough welding area, so that the welding difficulty is reduced, and the size L1, the size L2 and the size h are limited, so that the welding area has enough penetration depth, and the strength and the air tightness after welding are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular, to a battery housing and a battery. Background Art

[0002] The battery housing is an essential component of the battery. It not only protects the battery from physical damage but also ensures the safe operation of the battery system. Among them, in order to improve the safety performance of the battery cell, an explosion-proof valve is usually provided on the battery cell. The explosion-proof valve is usually provided on the cover plate. When the explosion-proof valve is opened due to the thermal runaway of the battery cell, since the circuit components and the explosion-proof valve are on the same side, there is a risk of fire and explosion due to mutual influence during pressure relief. Therefore, currently, the explosion-proof valve is arranged on the side wall of the housing to solve the problem of mutual influence between the explosion-proof valve and the circuit components.

[0003] In order to ensure smooth opening, the explosion-proof valve needs to have a sufficient area. However, since the installation area provided by the side wall of the housing for the explosion-proof valve is limited, the welding area between the explosion-proof valve and the side wall of the housing is relatively narrow, which not only makes the welding difficult but also results in poor welding strength and airtightness after welding. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery housing and a battery with small welding difficulty, high welding strength, and good welding airtightness.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] On the one hand, a battery housing is provided, and the battery housing includes:

[0007] A housing body, the housing body includes a first wall surface, and an installation hole is formed on the first wall surface;

[0008] An explosion-proof valve, the explosion-proof valve includes a plugging portion and a limiting portion. The plugging portion is inserted into the installation hole, the limiting portion is located inside the housing body and abuts against the inner side of the first wall surface. The explosion-proof valve is welded to the housing body and forms a welding area;

[0009] The overlapping dimension of the welding area and the plugging portion in the first direction is L1, the overlapping dimension of the welding area and the limiting portion in the first direction is L2, the thickness dimension of the first wall surface in the first direction is h, and (L1 + L2) / h ≥ 1.5 is satisfied.

[0010] Optionally, the overlapping dimension L1 of the welding area and the plugging portion in the first direction and the overlapping dimension L2 of the welding area and the limiting portion in the first direction satisfy L2 ≥ 0.5L1.

[0011] Optionally, a thickness dimension of the limiting portion along the first direction is T, and satisfies T≥2L2.

[0012] Optionally, an overlapping dimension L1 between the welding area and the plug-in portion along the first direction and a thickness dimension h of the first wall surface along the first direction satisfy L1=h.

[0013] Optionally, a width dimension of the limiting portion along the second direction is S1, a width dimension of the mounting hole along the second direction is S2, and (S1-S2) / 2h≥2 is satisfied.

[0014] Optionally, the explosion-proof valve is further provided with a first groove and a second groove, wherein the first groove is provided on a side of the limiting portion away from the plug-in portion, and the second groove is provided on a side of the plug-in portion away from the limiting portion;

[0015] A width dimension of the first groove along the second direction is S3, a width dimension of the second groove along the second direction is S4, and 2 mm ≤ (S2-S3) / 2 ≤ (S2-S4) / 2 is satisfied.

[0016] Optionally, the explosion-proof valve is further provided with a weakening structure, and the weakening structure is arranged in the second groove.

[0017] Optionally, the weakened structure is a notched groove extending along the first direction, and a thickness of the second groove where the notched groove is formed is smaller than a thickness of the second groove where the notched groove is not formed.

[0018] Optionally, a thickness dimension h of the first wall surface along the first direction satisfies 0.2 mm ≤ h ≤ 1.5 mm.

[0019] On the other hand, a battery is provided, comprising a cover plate, a pole group and a battery casing as described above, wherein the cover plate is arranged on an open portion of the battery casing and closes the battery casing to form a receiving cavity for receiving the pole group.

[0020] Beneficial effects of the present invention:

[0021] The present invention provides a battery housing, which includes an explosion-proof valve composed of a plugging part and a limiting part. By inserting the plugging part of the explosion-proof valve into the mounting hole on the first wall surface of the housing body and making the limiting part abut against the inner side of the first wall surface, there is an overlap in space between the limiting part of the explosion-proof valve and the first wall surface of the housing body. Thus, while ensuring that the explosion-proof valve has a sufficient opening area, the overlap in space between the limiting part and the first wall surface is used to ensure that there is a sufficient welding area between the explosion-proof valve and the housing body, thereby reducing the welding difficulty. Moreover, by defining the relationship among the overlapping dimension L1 of the welding area and the plugging part in the first direction, the overlapping dimension L2 of the welding area and the limiting part in the first direction, and the thickness dimension h of the first wall surface in the first direction, such that (L1 + L2) / h ≥ 1.5, it is ensured that the welding area has a sufficient penetration depth dimension in the first direction, enhancing the strength and airtightness after welding.

[0022] The present invention also provides a battery. By applying the above battery housing, not only the assembly difficulty is reduced and the assembly efficiency is improved, but also the battery has higher structural strength and airtightness, improving the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a structural cross-sectional view after welding between the housing body and the explosion-proof valve in the battery housing provided by the present invention;

[0024] Figure 2 is Figure 1 an enlarged view of the structure of part A in

[0025] Figure 3 is a three-dimensional view after welding between the housing body and the explosion-proof valve in the battery housing provided by the present invention;

[0026] Figure 4 is a schematic structural view of the explosion-proof valve in the battery housing provided by the present invention.

[0027] In the figure:

[0028] 100, welding area;

[0029] 1, housing body; 11, first wall surface;

[0030] 2, explosion-proof valve; 21, plugging part; 22, limiting part; 23, first groove; 24, second groove; 25, weakening structure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0032] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0034] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0035] When an explosion-proof valve is provided on the side wall of the housing, the installation area that the side wall of the housing can provide for the explosion-proof valve is limited, resulting in a relatively narrow welding area between the explosion-proof valve and the side wall of the housing. This not only makes the welding difficult, but also the strength and airtightness after welding are poor.

[0036] Therefore, in order to reduce the welding difficulty, enhance the strength and airtightness after welding, this embodiment provides a battery housing.

[0037] As Figures 1 to 4As shown, the battery housing includes a housing body 1 and an explosion-proof valve 2. The housing body 1 includes a first wall surface 11, and an installation hole is formed on the first wall surface 11. The explosion-proof valve 2 includes a plugging portion 21 and a limiting portion 22. The plugging portion 21 is inserted into the installation hole, and the limiting portion 22 is located inside the housing body 1 and abuts against the inner side of the first wall surface 11. The explosion-proof valve 2 is welded to the housing body 1 to form a welding area 100. The overlapping dimension of the welding area 100 and the plugging portion 21 in the first direction is L1, the overlapping dimension of the welding area 100 and the limiting portion 22 in the first direction is L2, and the thickness dimension of the first wall surface 11 in the first direction is h, and (L1 + L2) / h ≥ 1.5 is satisfied.

[0038] The battery housing includes an explosion-proof valve 2 composed of a plugging portion 21 and a limiting portion 22. By inserting the plugging portion 21 of the explosion-proof valve 2 into the installation hole on the first wall surface 11 of the housing body 1 and making the limiting portion 22 abut against the inner side of the first wall surface 11, there is an overlap in space between the limiting portion 22 of the explosion-proof valve 2 and the first wall surface 11 of the housing body 1. Thus, while ensuring that the explosion-proof valve 2 has a sufficient opening area, the overlap in space between the limiting portion 22 and the first wall surface 11 is used to ensure that there is a sufficient welding area between the explosion-proof valve 2 and the housing body 1, thereby reducing the welding difficulty. Also, by limiting the relationship among the overlapping dimension L1 of the welding area 100 and the plugging portion 21 in the first direction, the overlapping dimension L2 of the welding area 100 and the limiting portion 22 in the first direction, and the thickness dimension h of the first wall surface 11 in the first direction, such that (L1 + L2) / h ≥ 1.5, it is ensured that the welding area 100 has a sufficient penetration depth dimension in the first direction, enhancing the strength and airtightness after welding.

[0039] In this embodiment, after the assembly of the explosion-proof valve 2 and the housing body 1 is completed, that is, when the plugging portion 21 of the explosion-proof valve 2 is inserted into the installation hole of the housing body 1 and the limiting portion 22 of the explosion-proof valve 2 abuts against the inner side of the first wall surface 11, a welding device is used to weld along the junction between the plugging portion 21 and the first wall surface 11. The formed welding area 100 gradually extends along the first direction along the junction between the plugging portion 21 and the first wall surface 11 and finally penetrates into the limiting portion 22 of the explosion-proof valve 2. The depth of its extension is the penetration depth dimension of the welding area 100. In other words, the penetration depth dimension of the welding area 100 is the sum of the overlapping dimension L1 of the welding area 100 and the plugging portion 21 in the first direction and the overlapping dimension L2 of the welding area 100 and the limiting portion 22 in the first direction. The battery housing provided by the present invention can be applicable to different types of batteries, such as blade batteries or square shell batteries, etc. In this embodiment, as Figure 2 shown, the battery housing is adapted to a blade battery. Therefore, the housing body 1 is a hollow shell structure with both sides open, and the first wall surface 11 is the wall surface with a smaller cross-sectional area on the housing body 1.

[0040] Optionally, as Figure 1 , Figure 2 shown, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction satisfy L2 ≥ 0.5L1. By defining the relationship between the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction, and making L2 ≥ 0.5L1, the distance that the welding area 100 penetrates into the limiting part 22 is ensured to be sufficient, thereby ensuring the welding strength between the explosion-proof valve 2 and the housing body 1 after welding.

[0041] Optionally, as Figure 1 , Figure 2 shown, the thickness dimension T of the limiting part 22 in the first direction satisfies T ≥ 2L2. By defining the thickness dimension T of the limiting part 22 in the first direction and making it satisfy T ≥ 2L2, the sufficient thickness of the limiting part 22 is ensured, avoiding the melting through of the limiting part 22 due to the too small thickness dimension of the limiting part 22 when the welding area 100 penetrates into the inside of the limiting part 22.

[0042] Optionally, as Figure 1 , Figure 2 shown, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction and the thickness dimension h of the first wall surface 11 in the first direction satisfy L1 = h. Since during welding, the welding area 100 gradually extends from the insertion part 21 of the explosion-proof valve 2 towards the limiting part 22 of the explosion-proof valve 2, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is essentially the thickness dimension of the insertion part 21 in the first direction. By making the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction equal to the thickness dimension h of the first wall surface 11 in the first direction, it is equivalent to the equal thickness of the insertion part 21 of the explosion-proof valve 2 and the first wall surface 11. Thus, on the one hand, it is ensured that after the insertion part 21 is inserted into the mounting hole, the insertion part 21 does not protrude from the first wall surface 11 and the contact between the limiting part 22 and the inner side of the first wall surface 11 is ensured. On the other hand, it enables the welding area 100 to extend directly towards the inside of the limiting part 22 along the junction of the first wall surface 11 and the insertion part 21 after passing through the first wall surface 11, avoiding the occurrence of voids between the limiting part 22 and the first wall surface 11, resulting in void welding and affecting the welding quality.

[0043] Optionally, as Figure 1 , Figure 2As shown, the width dimension of the limiting portion 22 along the second direction is S1, and the width dimension of the mounting hole along the second direction is S2, and they satisfy (S1-S2) / 2h≥2. By limiting the width dimension S1 of the limiting portion 22 along the second direction and the width dimension S2 of the mounting hole along the second direction, so that both satisfy (S1-S2) / 2h≥2, it is ensured that the portion of the limiting portion 22 extending from the junction of the plug-in portion 21 and the first wall surface 11 along the second direction, in the direction away from the center, is long enough, so that the portion of the welding area 100 extending along the second direction in the direction away from the center is completely covered in the limiting portion 22, providing sufficient width for the welding area 100 to extend along the second direction in the direction away from the center, and ensuring the welding quality of the welding area 100 after forming.

[0044] Alternatively, if Figure 1 , Figure 2 As shown, the explosion-proof valve 2 is also provided with a first groove 23 and a second groove 24. The first groove 23 is provided on the side of the limiting portion 22 away from the plug-in portion 21, and the second groove 24 is provided on the side of the plug-in portion 21 away from the limiting portion 22. The width dimension of the first groove 23 along the second direction is S3, and the width dimension of the second groove 24 along the second direction is S4, and 2mm≤(S2-S3) / 2≤(S2-S4) / 2 is satisfied. By providing the first groove 23 and the second groove 24 on the explosion-proof valve 2, the thickness of the explosion-proof valve 2 is reduced, so that the explosion-proof valve 2 can be opened under pressure. In addition, by limiting the width dimension S3 of the first groove 23 along the second direction and the width dimension S4 of the second groove 24 along the second direction, the two satisfy 2mm≤(S2-S3) / 2≤(S2-S4) / 2, so as to ensure that the portion of the limiting portion 22 extending from the junction of the plug-in portion 21 and the first wall surface 11 along the second direction toward the center is long enough, so that the portion of the welding area 100 extending along the second direction toward the center is completely covered in the limiting portion 22, providing sufficient width for the welding area 100 to extend along the second direction toward the center, thereby ensuring the welding quality of the welding area 100 after forming.

[0045] In this embodiment, in order to confirm the influence of the relevant parameter settings of the overlapping dimension L1 between the welding area 100 and the plug-in portion 21 along the first direction, the overlapping dimension L2 between the welding area 100 and the limiting portion 22 along the first direction, the thickness dimension h of the first wall 11 along the first direction, the width dimension S1 of the limiting portion 22 along the second direction, and the width dimension S2 of the mounting hole along the second direction on the welding quality of the explosion-proof valve 2 and the shell body 1, Tables 1 and 2 for comparison are designed for verification.

[0046] When verifying the welding strength, first complete the welding of the explosion-proof valve 2 provided in this embodiment with the housing body 1, and then detect the welding strength between the two. If the welding strength is greater than 1.2 Mpa, it meets the requirements; if the welding strength is less than 1.2 Mpa, it does not meet the requirements. In addition, it is also necessary to perform an inflation deformation test on the explosion-proof valve 2 and the housing body 1 after welding. By filling the housing body 1 with gas at a pressure of ±0.15 Mpa, positive pressure and negative pressure treatment are performed on the housing body 1, and it is cycled 10 times to test the deformation amount at the welding joint. If the deformation amount is less than 0.3 mm, it meets the design requirements; if the deformation amount is greater than 0.3 mm, it does not meet the design requirements. When the welding strength after testing is greater than 1.2 Mpa and the deformation amount at the welding joint is less than 0.3 mm, the product is qualified; if the welding strength after testing is less than 1.2 Mpa and the deformation amount at the welding joint is greater than 0.3 mm, the product is unqualified.

[0047] Table 1

[0048]

[0049] In Embodiment 1, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 0.2 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.13 mm. At this time, (L1 + L2) = 0.33 mm. Since h = L1, then h = L1 = 0.2 mm. At this time, (L1 + L2) / h = 1.65, which meets the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 0.55 mm. At this time, (S1 - S2) / 2h = 2.75, which meets the requirement of (S1 - S2) / 2h ≥ 2. After detection, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.25 Mpa > 1.2 Mpa, and the deformation amount at the welding joint is 0.24 mm < 0.3 mm. Therefore, it meets the design requirements and the product is qualified.

[0050] In Embodiment 2, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 0.35 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.19 mm. At this time, (L1 + L2) = 0.54 mm. Since h = L1, then h = L1 = 0.35 mm. At this time, (L1 + L2) / h = 1.54, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 0.75 mm. At this time, (S1 - S2) / 2h = 2.14, meeting the requirement of (S1 - S2) / 2h ≥ 2. After detection, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.34 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.17 mm < 0.3 mm. Therefore, it meets the design requirements and the product is qualified.

[0051] In Embodiment 3, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 0.45 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.28 mm. At this time, (L1 + L2) = 0.73 mm. Since h = L1, then h = L1 = 0.45 mm. At this time, (L1 + L2) / h = 1.62, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 0.9 mm. At this time, (S1 - S2) / 2h = 2, meeting the requirement of (S1 - S2) / 2h ≥ 2. After detection, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.27 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.16 mm < 0.3 mm. Therefore, it meets the design requirements and the product is qualified.

[0052] In Embodiment 4, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 0.5 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.26 mm. At this time, (L1 + L2) = 0.76 mm. Since h = L1, then h = L1 = 0.5 mm. At this time, (L1 + L2) / h = 1.52, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 1.05 mm. At this time, (S1 - S2) / 2h = 2.1, meeting the requirement of (S1 - S2) / 2h ≥ 2. After testing, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.41 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.22 mm < 0.3 mm. Therefore, it meets the design requirements and the product is qualified.

[0053] In Embodiment 5, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 0.6 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.3 mm. At this time, (L1 + L2) = 0.9 mm. Since h = L1, then h = L1 = 0.6 mm. At this time, (L1 + L2) / h = 1.5, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 1.35 mm. At this time, (S1 - S2) / 2h = 2.25, meeting the requirement of (S1 - S2) / 2h ≥ 2. After testing, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.23 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.06 mm < 0.3 mm. Therefore, it meets the design requirements and the product is qualified.

[0054] In Embodiment 6, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 0.75 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.42 mm. At this time, (L1 + L2) = 1.17 mm. Since h = L1, then h = L1 = 0.75 mm. At this time, (L1 + L2) / h = 1.56, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 1.55 mm. At this time, (S1 - S2) / 2h = 2.07, meeting the requirement of (S1 - S2) / 2h ≥ 2. After testing, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.37 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.12 mm < 0.3 mm. Therefore, it meets the design requirements and the product is qualified.

[0055] In Embodiment 7, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 0.8 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.58 mm. At this time, (L1 + L2) = 1.38 mm. Since h = L1, then h = L1 = 0.8 mm. At this time, (L1 + L2) / h = 1.73, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 1.75 mm. At this time, (S1 - S2) / 2h = 2.19, meeting the requirement of (S1 - S2) / 2h ≥ 2. After testing, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.23 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.13 mm < 0.3 mm. Therefore, it meets the design requirements and the product is qualified.

[0056] In Embodiment 8, the overlapping dimension L1 of the welding area 100 and the insertion portion 21 in the first direction is set to 0.95 mm, and the overlapping dimension L2 of the welding area 100 and the limiting portion 22 in the first direction is set to 0.65 mm. At this time, (L1 + L2) = 1.6 mm. Since h = L1, then h = L1 = 0.95 mm. At this time, (L1 + L2) / h = 1.68, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting portion 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 2.15 mm. At this time, (S1 - S2) / 2h = 2.26, meeting the requirement of (S1 - S2) / 2h ≥ 2. After inspection, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.22 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.09 mm < 0.3 mm. Therefore, it meets the design requirements and the product is qualified.

[0057] In Embodiment 9, the overlapping dimension L1 of the welding area 100 and the insertion portion 21 in the first direction is set to 1.1 mm, and the overlapping dimension L2 of the welding area 100 and the limiting portion 22 in the first direction is set to 0.86 mm. At this time, (L1 + L2) = 1.96 mm. Since h = L1, then h = L1 = 1.1 mm. At this time, (L1 + L2) / h = 1.78, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting portion 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 2.65 mm. At this time, (S1 - S2) / 2h = 2.41, meeting the requirement of (S1 - S2) / 2h ≥ 2. After inspection, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.31 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.25 mm < 0.3 mm. Therefore, it meets the design requirements and the product is qualified.

[0058] In Embodiment 10, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 1.2 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.83 mm. At this time, (L1 + L2) = 2.03 mm. Since h = L1, then h = L1 = 1.2 mm. At this time, (L1 + L2) / h = 1.69, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 3.2 mm. At this time, (S1 - S2) / 2h = 2.67, meeting the requirement of (S1 - S2) / 2h ≥ 2. After testing, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.31 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.05 mm < 0.3 mm. Therefore, it meets the design requirements and the product is qualified.

[0059] In Embodiment 11, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 1.35 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.95 mm. At this time, (L1 + L2) = 2.3 mm. Since h = L1, then h = L1 = 1.35 mm. At this time, (L1 + L2) / h = 1.7, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 3.5 mm. At this time, (S1 - S2) / 2h = 2.59, meeting the requirement of (S1 - S2) / 2h ≥ 2. After testing, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.28 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.18 mm < 0.3 mm. Therefore, it meets the design requirements and the product is qualified.

[0060] In Embodiment 12, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 1.5 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 1.24 mm. At this time, (L1 + L2) = 2.74 mm. Since h = L1, then h = L1 = 1.5 mm. At this time, (L1 + L2) / h = 1.83, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 3 mm. At this time, (S1 - S2) / 2h = 2, meeting the requirement of (S1 - S2) / 2h ≥ 2. After inspection, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.26 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.16 mm < 0.3 mm. Therefore, it meets the design requirements and the product is qualified.

[0061] As can be seen from Embodiments 1 to 12, when the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction, the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction, and the thickness dimension h of the first wall surface 11 in the first direction satisfy the requirement of (L1 + L2) / h ≥ 1.5, and when the width dimension S1 of the limiting part 22 in the second direction, the width dimension S2 of the mounting hole in the second direction, and the thickness dimension h of the first wall surface 11 in the first direction satisfy the requirement of (S1 - S2) / 2h ≥ 2, for the explosion-proof valve 2 and the housing body 1 welded under these two conditions, while ensuring that the explosion-proof valve 2 has a sufficient opening area, it also ensures that there is a sufficient welding area between the explosion-proof valve 2 and the housing body 1, and makes the welding area 100 have a sufficient penetration depth dimension in the first direction, thus having a high welding strength. Specifically, the welding strength is greater than 1.2 Mpa, and the deformation amount at the welding position is less than 0.3 mm. Therefore, it meets the design requirements and the product is qualified.

[0062] Table 2

[0063]

[0064] In Comparative Example 1, the overlapping dimension L1 of the welding area 100 and the insertion portion 21 in the first direction is set to 0.2 mm, and the overlapping dimension L2 of the welding area 100 and the limiting portion 22 in the first direction is set to 0.08 mm. At this time, (L1 + L2) = 0.28 mm. Since h = L1, then h = L1 = 0.2 mm. At this time, (L1 + L2) / h = 1.4, which does not meet the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting portion 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 0.5 mm. At this time, (S1 - S2) / 2h = 2.5, which meets the requirement of (S1 - S2) / 2h ≥ 2. After testing, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.05 Mpa < 1.2 Mpa, and the deformation amount at the welding position is 0.25 mm < 0.3 mm. Due to the too low welding strength, it does not meet the design requirements, and the product is unqualified.

[0065] In Comparative Example 2, the overlapping dimension L1 of the welding area 100 and the insertion portion 21 in the first direction is set to 0.6 mm, and the overlapping dimension L2 of the welding area 100 and the limiting portion 22 in the first direction is set to 0.28 mm. At this time, (L1 + L2) = 0.88 mm. Since h = L1, then h = L1 = 0.6 mm. At this time, (L1 + L2) / h = 1.47, which does not meet the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting portion 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 1.25 mm. At this time, (S1 - S2) / 2h = 2.08, which meets the requirement of (S1 - S2) / 2h ≥ 2. After testing, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.17 Mpa < 1.2 Mpa, and the deformation amount at the welding position is 0.27 mm < 0.3 mm. Due to the too low welding strength, it does not meet the design requirements, and the product is unqualified.

[0066] In Comparative Example 3, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 0.8 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.35 mm. At this time, (L1 + L2) = 1.15 mm. Since h = L1, then h = L1 = 0.8 mm. At this time, (L1 + L2) / h = 1.44, which does not meet the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 1.85 mm. At this time, (S1 - S2) / 2h = 2.31, which meets the requirement of (S1 - S2) / 2h ≥ 2. After inspection, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.04 Mpa < 1.2 Mpa, and the deformation amount at the welding joint is 0.22 mm < 0.3 mm. Since the welding strength is too low, it does not meet the design requirements and the product is unqualified.

[0067] In Comparative Example 4, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 1 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.31 mm. At this time, (L1 + L2) = 1.31 mm. Since h = L1, then h = L1 = 1 mm. At this time, (L1 + L2) / h = 1.31, which does not meet the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 2.25 mm. At this time, (S1 - S2) / 2h = 2.25, which meets the requirement of (S1 - S2) / 2h ≥ 2. After inspection, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.06 Mpa < 1.2 Mpa, and the deformation amount at the welding joint is 0.16 mm < 0.3 mm. Since the welding strength is too low, it does not meet the design requirements and the product is unqualified.

[0068] In Comparative Example 5, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 1.2 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.42 mm. At this time, (L1 + L2) = 1.62 mm. Since h = L1, then h = L1 = 1.2 mm. At this time, (L1 + L2) / h = 1.35, which does not meet the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 2.85 mm. At this time, (S1 - S2) / 2h = 2.38, which meets the requirement of (S1 - S2) / 2h ≥ 2. After testing, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 0.98 Mpa < 1.2 Mpa, and the deformation amount at the welding joint is 0.27 mm < 0.3 mm. Since the welding strength is too low, it does not meet the design requirements and the product is unqualified.

[0069] In Comparative Example 6, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 1.5 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.63 mm. At this time, (L1 + L2) = 2.13 mm. Since h = L1, then h = L1 = 1.5 mm. At this time, (L1 + L2) / h = 1.42, which does not meet the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 3.15 mm. At this time, (S1 - S2) / 2h = 2.1, which meets the requirement of (S1 - S2) / 2h ≥ 2. After testing, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.11 Mpa < 1.2 Mpa, and the deformation amount at the welding joint is 0.18 mm < 0.3 mm. Since the welding strength is too low, it does not meet the design requirements and the product is unqualified.

[0070] It can be seen from Comparative Example 1 to Comparative Example 6 that when the relationship values of the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction, the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction, and the thickness dimension h of the first wall surface 11 in the first direction are less than the minimum value of (L1 + L2) / h ≥ 1.5, at this time, due to the insufficient penetration depth of the welding area 100, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is poor, which is specifically manifested as the welding strength being less than 1.2 Mpa, so it does not meet the design requirements and the product is unqualified.

[0071] In Comparative Example 7, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 0.2 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.17 mm. At this time, (L1 + L2) = 0.37 mm. Since h = L1, then h = L1 = 0.2 mm. At this time, (L1 + L2) / h = 1.85, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 0.38 mm. At this time, (S1 - S2) / 2h = 1.9, not meeting the requirement of (S1 - S2) / 2h ≥ 2. After inspection, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.27 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.34 mm > 0.3 mm. Since the deformation amount after welding is too large, it does not meet the design requirements and the product is unqualified.

[0072] In Comparative Example 8, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 0.6 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.32 mm. At this time, (L1 + L2) = 0.92 mm. Since h = L1, then h = L1 = 0.6 mm. At this time, (L1 + L2) / h = 1.53, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 1.15 mm. At this time, (S1 - S2) / 2h = 1.92, not meeting the requirement of (S1 - S2) / 2h ≥ 2. After inspection, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.32 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.47 mm > 0.3 mm. Since the deformation amount after welding is too large, it does not meet the design requirements and the product is unqualified.

[0073] In Comparative Example 9, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 0.8 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.67 mm. At this time, (L1 + L2) = 1.47 mm. Since h = L1, then h = L1 = 0.8 mm. At this time, (L1 + L2) / h = 1.84, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 1.5 mm. At this time, (S1 - S2) / 2h = 1.88, not meeting the requirement of (S1 - S2) / 2h ≥ 2. After testing, the welding strength between the explosion-proof valve 2 and the shell body 1 after welding is 1.45 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.36 mm > 0.3 mm. Since the deformation amount after welding is too large, it does not meet the design requirements and the product is unqualified.

[0074] In Comparative Example 10, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 1 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.68 mm. At this time, (L1 + L2) = 1.68 mm. Since h = L1, then h = L1 = 1 mm. At this time, (L1 + L2) / h = 1.68, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 1.75 mm. At this time, (S1 - S2) / 2h = 1.75, not meeting the requirement of (S1 - S2) / 2h ≥ 2. After testing, the welding strength between the explosion-proof valve 2 and the shell body 1 after welding is 1.3 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.34 mm > 0.3 mm. Since the deformation amount after welding is too large, it does not meet the design requirements and the product is unqualified.

[0075] In Comparative Example 11, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 1.2 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.83 mm. At this time, (L1 + L2) = 2.03 mm. Since h = L1, then h = L1 = 1.2 mm. At this time, (L1 + L2) / h = 1.7, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 2.25 mm. At this time, (S1 - S2) / 2h = 1.89, not meeting the requirement of (S1 - S2) / 2h ≥ 2. After testing, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.29 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.45 mm > 0.3 mm. Since the deformation amount after welding is too large, it does not meet the design requirements, and the product is unqualified.

[0076] In Comparative Example 12, the overlapping dimension L1 of the welding area 100 and the insertion part 21 in the first direction is set to 1.5 mm, and the overlapping dimension L2 of the welding area 100 and the limiting part 22 in the first direction is set to 0.98 mm. At this time, (L1 + L2) = 2.48 mm. Since h = L1, then h = L1 = 1.5 mm. At this time, (L1 + L2) / h = 1.65, meeting the requirement of (L1 + L2) / h ≥ 1.5. The relationship value between the width dimension S1 of the limiting part 22 in the second direction and the width dimension S2 of the mounting hole in the second direction is set, and (S1 - S2) / 2 = 2.8 mm. At this time, (S1 - S2) / 2h = 1.87, not meeting the requirement of (S1 - S2) / 2h ≥ 2. After testing, the welding strength between the explosion-proof valve 2 and the housing body 1 after welding is 1.27 Mpa > 1.2 Mpa, and the deformation amount at the welding position is 0.32 mm > 0.3 mm. Since the deformation amount after welding is too large, it does not meet the design requirements, and the product is unqualified.

[0077] It can be seen from Comparative Examples 7 to 12 that when the width dimension S1 of the limiting part 22 in the second direction, the width dimension S2 of the mounting hole in the second direction, and the thickness dimension h of the first wall surface 11 in the first direction are less than the minimum value of (S1 - S2) / 2h ≥ 2, due to the excessive small amount of material reserved between the width of the limiting part 22 in the second direction and the width of the welding area 100 in the second direction, the problem that the limiting part 22 is melted through occurs, resulting in the high temperature spreading to the first wall surface 11 of the housing body 1, and finally the deformation occurs at the first wall surface 11. The specific manifestation is that the deformation amounts are all greater than 0.3 mm. Due to the large deformation amount, it will squeeze the explosion-proof valve 2, resulting in the reduction of the pressure resistance strength of the explosion-proof valve 2, that is, the opening pressure of the explosion-proof valve 2. Therefore, it does not meet the design requirements, and the product is unqualified.

[0078] Optionally, as Figure 3 shown, the explosion-proof valve 2 is further provided with a weakening structure 25, and the weakening structure 25 is arranged in the second groove 24. By arranging the weakening structure 25 in the second groove 24, the thickness of the explosion-proof valve 2 is further weakened, the structural strength of the explosion-proof valve 2 is reduced, and it is ensured that the high-pressure gas generated during thermal runaway can break through the weakening structure 25 to realize the opening of the explosion-proof valve 2, so as to achieve the purpose of pressure relief and protection.

[0079] Specifically, as Figure 4 shown, the weakening structure 25 is a notch groove extending in the first direction, and the thickness of the second groove 24 at the notch groove is less than the thickness of the second groove 24 without the notch groove.

[0080] Optionally, as Figure 2 shown, the thickness dimension h of the first wall surface 11 in the first direction satisfies 0.2 mm ≤ h ≤ 1.5 mm. By limiting the thickness dimension h of the first wall surface 11 in the first direction to satisfy 0.2 mm ≤ h ≤ 1.5 mm, on the one hand, it avoids the excessive thickness of the first wall surface 11 and increases the difficulty of penetration during welding, and on the other hand, it avoids the small thickness of the first wall surface 11, resulting in weak structural strength of the first wall surface 11. When thermal runaway occurs, it is deformed under pressure, thus squeezing the explosion-proof valve 2, resulting in a decrease in the pressure resistance strength of the explosion-proof valve 2, that is, the opening pressure of the explosion-proof valve 2.

[0081] In this embodiment, a battery is further provided. The battery includes a cover plate, a pole group, and the above-mentioned battery housing. The cover plate is covered at the open end of the battery housing and closes the battery housing to form an accommodation cavity for accommodating the pole group. By applying the above-mentioned battery housing, the battery not only reduces the assembly difficulty and improves the assembly efficiency, but also has higher structural strength and airtightness, improving the product quality.

[0082] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Battery housing, characterized in that, The battery housing comprises: A shell body, the shell body comprising a first wall surface, and a mounting hole is formed on the first wall surface; An explosion-proof valve, the explosion-proof valve comprising a plug-in portion and a limiting portion, the plug-in portion being inserted into the mounting hole, the limiting portion being located in the shell body and abutting against the inner side of the first wall surface, the explosion-proof valve being welded to the shell body to form a welding area; The overlapping dimension between the welding area and the plug-in portion along the first direction is L1, the overlapping dimension between the welding area and the limiting portion along the first direction is L2, the thickness dimension of the first wall surface along the first direction is h, and (L1+L2) / h≥1.5 is satisfied.

2. The battery housing according to claim 1, characterized in that, An overlapping dimension L1 between the welding area and the plug-in portion along the first direction and an overlapping dimension L2 between the welding area and the limiting portion along the first direction satisfy L2≥0.5L1.

3. The battery housing according to claim 2, characterized in that, The thickness dimension of the limiting portion along the first direction is T, and satisfies T≥2L2.

4. The battery housing according to claim 1, characterized in that, An overlapping dimension L1 between the welding area and the inserting portion along the first direction and a thickness dimension h of the first wall surface along the first direction satisfy L1=h.

5. The battery housing according to claim 1, characterized in that, A width dimension of the limiting portion along the second direction is S1, a width dimension of the mounting hole along the second direction is S2, and (S1-S2) / 2h≥2 is satisfied.

6. The battery housing according to claim 5, characterized in that, The explosion-proof valve is further provided with a first groove and a second groove, wherein the first groove is provided on a side of the limiting portion away from the plug-in portion, and the second groove is provided on a side of the plug-in portion away from the limiting portion; A width dimension of the first groove along the second direction is S3, a width dimension of the second groove along the second direction is S4, and 2 mm ≤ (S2-S3) / 2 ≤ (S2-S4) / 2 is satisfied.

7. The battery housing according to claim 6, characterized in that, The explosion-proof valve is also provided with a weakening structure, and the weakening structure is arranged in the second groove.

8. The battery housing according to claim 7, wherein, The weakened structure is a notched groove extending along the first direction, and the thickness of the second groove where the notched groove is formed is smaller than the thickness of the second groove where the notched groove is not formed.

9. The battery housing according to claim 1, characterized in that, A thickness dimension h of the first wall surface along the first direction satisfies 0.2 mm ≤ h ≤ 1.5 mm.

10. A battery, characterized in that, The battery comprises a cover plate, an electrode group and a battery casing as claimed in any one of claims 1 to 9, wherein the cover plate is arranged on an open portion of the battery casing and closes the battery casing to form a receiving cavity for receiving the electrode group.

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