Battery case assembly and battery cell

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery case assembly and a battery monomer, the battery case assembly comprises a battery case and an anti-explosion valve, the battery case is provided with an anti-explosion hole, the inner wall of the battery case is provided with a connecting structure, the connecting structure is distributed along the circumferential direction of the anti-explosion hole, the anti-explosion valve is plugged at the anti-explosion hole, and the anti-explosion valve is connected with the connecting structure. The battery shell assembly is favorable for reducing the weight of the battery shell, further is favorable for improving the energy density of the battery monomers, and can reduce the risk that the anti-explosion valve is impacted due to the influence of external factors.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery shell assembly and a battery monomer. Background Art

[0002] With the continuous development of technology, users have higher and higher requirements for new energy batteries. In order to improve the safety performance of battery cells, explosion-proof valves are usually installed on the battery shell or battery cover. When the battery cell operates abnormally and generates gas inside, the gas can be discharged through the explosion-proof valve to avoid major safety accidents.

[0003] Currently, there are two common approaches to installing explosion-proof valves on battery cases. One approach involves increasing the thickness of the battery case and creating a stepped hole in the sidewall. The explosion-proof valve is then fixed to the stepped surface of the hole. This increases the weight of the battery case and hinders the improvement of the energy density of the battery cells. The other approach involves creating a boss on the outer wall of the battery case and fixing the explosion-proof valve to the boss. This approach occupies space outside the battery case and increases the risk of the explosion-proof valve being impacted by external factors.

[0004] Therefore, it is urgent to propose a battery shell assembly and a battery cell to solve the above technical problems. Utility Model Content

[0005] The first object of the present utility model is to provide a battery shell assembly, which is conducive to reducing the weight of the battery shell, thereby helping to improve the energy density of the battery cell, and at the same time can reduce the risk of the explosion-proof valve being impacted by external factors.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Battery housing assembly, comprising:

[0008] A battery shell is provided with an explosion-proof hole, and a connecting structure is provided on the inner wall of the battery shell, and the connecting structure is distributed along the circumference of the explosion-proof hole;

[0009] An explosion-proof valve is sealed at the explosion-proof hole and is connected to the connecting structure.

[0010] Optionally, the connection structure includes a first connection part and a second connection part, the first connection part is arranged on the inner wall of the battery shell, the second connection part is connected to the first connection part, and the second connection part extends in a direction toward the axis of the explosion-proof hole, and the explosion-proof valve is arranged on the second connection part.

[0011] Optionally, the side of the explosion-proof valve away from the second connecting portion is flush with the outer wall of the battery shell; or the side of the explosion-proof valve away from the second connecting portion is recessed into the outer wall of the battery shell;

[0012] And / or, the explosion-proof valve is provided with a limiting portion, which extends along the circumference of the explosion-proof valve and is connected end to end, and the second connecting portion extends along the circumference of the explosion-proof hole and is connected end to end, and the limiting portion and the second connecting portion are in contact with one side of the explosion-proof hole axis.

[0013] Optionally, the connection structure includes a connection area, which is an area on the inner wall of the battery shell located at the edge of the explosion-proof hole.

[0014] Optionally, the connection structure also includes a third connection portion, which is adjacent to the connection area and connected to the inner wall of the battery shell. The third connection portion extends circumferentially along the explosion-proof hole and is connected end to end, and the side wall of the explosion-proof valve is in contact with the third connection portion.

[0015] Optionally, the battery shell assembly also includes a partition, the partition includes a plate body, the wall of the battery shell provided with an explosion-proof hole is a first wall body, the plate body is connected to the inner wall of the battery shell and is parallel to the first wall body, in the first direction, the size of the plate body is equal to the size of the first wall body, the first direction is configured as the direction in which the electrode group enters the battery shell, and the connection structure is located between the plate body and the inner wall of the first wall body.

[0016] Optionally, the partition further includes two groups of protruding structures, which are respectively located on two opposite sides of the plate body and connected, and the protruding structures are connected to the inner wall of the first wall body.

[0017] Optionally, the protruding structure includes a protruding portion, and the protruding portion extends along the first direction;

[0018] Alternatively, the protruding structure includes a plurality of protruding portions, and the plurality of protruding portions are arranged at intervals along the first direction.

[0019] Optionally, a plurality of through holes are provided on the plate body.

[0020] A second object of the present invention is to provide a battery cell having a high energy density and a low risk of an explosion-proof valve of the battery cell being impacted by external factors.

[0021] To achieve this purpose, the present invention adopts the following technical solutions:

[0022] A battery cell includes a pole group and the above-mentioned battery shell assembly, and the pole is arranged in the battery shell.

[0023] Beneficial effects of the utility model:

[0024] The battery shell assembly provided by the present invention has a connection structure distributed along the circumference of the explosion-proof hole on the inner wall of the battery shell, and the explosion-proof valve is sealed at the explosion-proof hole and connected to the connection structure, thereby realizing a structure in which the explosion-proof valve is provided on the battery shell. The connection structure connected to the explosion-proof valve is provided on the inner wall of the battery shell. Therefore, this structural design can seal the explosion-proof valve at the explosion-proof hole without increasing the wall thickness of the battery shell, which is beneficial to reducing the weight of the battery shell and further beneficial to improving the energy density of the battery cell. At the same time, this structural design eliminates the need to provide a boss on the outer wall of the battery shell, reducing the probability of the explosion-proof valve occupying the external space of the battery shell, thereby reducing the risk of the explosion-proof valve being affected by external factors and being impacted.

[0025] The battery cell provided by the utility model adopts the above-mentioned battery shell assembly, and the explosion-proof valve can be set on the battery shell without increasing the wall thickness of the battery shell, and without providing a boss on the outer wall of the battery shell, which is beneficial to improving the energy density of the battery cell and reducing the risk of the explosion-proof valve being affected by external factors and being impacted. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a schematic structural diagram of a battery housing assembly provided in Example 1;

[0027] Figure 2 1 is a schematic diagram of a partial cross-sectional structure of a battery housing assembly provided in Example 1 without showing a separator;

[0028] Figure 3 is a schematic diagram of a partial cross-sectional structure of a battery cell provided in Example 1;

[0029] Figure 4 is a schematic structural diagram of the partition provided in Example 1;

[0030] Figure 5 This is a schematic diagram of a partial cross-sectional structure when the explosion-proof valve air tightness test is performed on the battery cell provided in Example 1;

[0031] Figure 6 1 is a schematic diagram of a partial cross-sectional structure of a battery housing assembly provided in Example 2 without showing a separator;

[0032] Figure 7 1 is a schematic diagram of a partial cross-sectional structure of a battery housing assembly provided in Example 3 without showing a separator;

[0033] Figure 8 It is a structural schematic diagram of the partition provided in Example 4.

[0034] In the picture:

[0035] 100, battery case; 110, explosion-proof hole; 120, connection structure; 121, first connection portion; 122, second connection portion; 123, connection area; 124, third connection portion; 130, first wall; 200, explosion-proof valve; 210, limiter; 310, plate; 311, through hole; 320, protrusion;

[0036] 10. Pole group; 20. Sealing ring;

[0037] D1, first direction. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0039] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0042] Example 1

[0043] This embodiment provides a battery shell assembly, which is beneficial for reducing the weight of the battery shell, thereby improving the energy density of the battery cell, and at the same time can reduce the risk of the explosion-proof valve being impacted by external factors.

[0044] Specifically, if Figure 1 and Figure 2 As shown, the battery shell assembly includes a battery shell 100 and an explosion-proof valve 200, wherein an explosion-proof hole 110 is provided on the battery shell 100, and a connecting structure 120 is provided on the inner wall of the battery shell 100, and the connecting structure 120 is distributed along the circumference of the explosion-proof hole 110, and the explosion-proof valve 200 is sealed at the explosion-proof hole 110, and the explosion-proof valve 200 is connected to the connecting structure 120.

[0045] The battery shell assembly provided in this embodiment has a connection structure 120 circumferentially distributed along the explosion-proof hole 110 on the inner wall of the battery shell 100, and the explosion-proof valve 200 is sealed at the explosion-proof hole 110 and connected to the connection structure 120, thereby realizing a structure in which the explosion-proof valve 200 is provided on the battery shell 100. The connection structure 120 connected to the explosion-proof valve 200 is provided on the inner wall of the battery shell 100. Therefore, this structural design can seal the explosion-proof valve 200 at the explosion-proof hole 110 without increasing the wall thickness of the battery shell 100, which is beneficial to reducing the weight of the battery shell 100 and further facilitating an increase in the energy density of the battery cell. At the same time, this structural design eliminates the need for a boss on the outer wall of the battery shell 100, reducing the probability of the explosion-proof valve 200 occupying the external space of the battery shell 100, thereby reducing the risk of the explosion-proof valve 200 being impacted by external factors.

[0046] Alternatively, as Figure 1 and Figure 2 As shown, the connection structure 120 includes a first connection part 121 and a second connection part 122. The first connection part 121 is arranged on the inner wall of the battery shell 100, and the second connection part 122 is connected to the first connection part 121. The second connection part 122 extends in a direction toward the axis of the explosion-proof hole 110. The explosion-proof valve 200 is arranged on the second connection part 122, thereby realizing the connection between the explosion-proof valve 200 and the connection structure 120.

[0047] In this embodiment, the explosion-proof valve 200 is arranged on the side of the second connecting portion 122 facing away from the interior of the battery shell 100, that is, the explosion-proof valve 200 is mounted on the second connecting portion 122. Of course, in other implementation schemes, the explosion-proof valve 200 can also be connected to the side of the second connecting portion 122 facing the interior of the battery shell 100.

[0048] Furthermore, both the first connection portion 121 and the second connection portion 122 extend along the circumference of the explosion-proof valve 200 and are connected end to end, thereby improving the reliability of the connection between the explosion-proof valve 200 and the connection structure 120. In other embodiments, one of the first connection portion 121 and the second connection portion 122 may extend along the circumference of the explosion-proof valve 200 and be connected end to end, while the other may be spaced apart along the circumference of the explosion-proof valve 200; or both the first connection portion 121 and the second connection portion 122 may be spaced apart along the circumference of the explosion-proof valve 200.

[0049] Further, if Figure 1 and Figure 2 As shown, the side wall of the explosion-proof valve 200 is fitted with the hole wall of the explosion-proof hole 110 , and the edge of the explosion-proof valve 200 is welded to the edge of the explosion-proof hole 110 , so that the explosion-proof valve 200 is sealed at the explosion-proof hole 110 .

[0050] Further, if Figure 1 and Figure 2 As shown, the side of the explosion-proof valve 200 away from the second connecting portion 122 is recessed into the outer wall of the battery case 100 , further reducing the risk of the explosion-proof valve 200 being impacted by external factors.

[0051] In another embodiment, the side of the explosion-proof valve 200 facing away from the second connecting portion 122 is flush with the outer wall of the battery shell 100 to improve the overall structural consistency of the outer wall of the battery shell 100.

[0052] Alternatively, as Figures 1 to 4 As shown, the wall of the battery shell 100 provided with the explosion-proof hole 110 is the first wall 130, and the connecting structure 120 is located on the inner wall of the first wall 130, that is, the connecting structure 120 is protruding from the inner surface of the first wall 130, and / or the explosion-proof valve 200 is protruding from the inner surface of the first wall 130. When the electrode group 10 is installed in the battery shell 100, it is easy for the electrode group 10 to collide with the connecting structure 120 and / or the explosion-proof valve 200, and even the connecting structure 120 and / or the explosion-proof valve 200 to block the entry path of the electrode group 10 into the battery shell 100, making it impossible to smoothly install the electrode group 10 into the battery shell 100. To solve this technical problem, the battery shell assembly provided in this embodiment also includes a partition, which includes a plate body 310. The plate body 310 is connected to the inner wall of the battery shell 100 and is parallel to the first wall body 130. In the first direction D1, the size of the plate body 310 is equal to the size of the first wall body 130. The first direction D1 is configured as the direction in which the electrode group 10 enters the battery shell 100. The connecting structure 120 is located between the plate body 310 and the inner wall of the first wall body 130, thereby isolating the connecting structure 120 and / or the explosion-proof valve 200 protruding from the inner wall of the first wall body 130 between the plate body 310 and the inner wall of the first wall body 130, so that the electrode group 10 can be more smoothly loaded into the battery shell 100.

[0053] Further, if Figures 1 to 4 As shown, a plurality of through holes 311 are provided on the plate body 310. When high-pressure gas is generated in the battery shell 100, the high-pressure gas can reach the explosion-proof valve 200 through the through holes 311. When the air pressure in the battery shell 100 reaches the preset pressure value of the explosion-proof valve 200, the explosion-proof valve 200 opens and discharges the high-pressure gas in the battery. The setting of the through holes 311 provides a strong guarantee for the reliability of the explosion-proof valve 200.

[0054] Further, if Figures 1 to 4 As shown, the separator also includes two sets of protrusions, located on opposite sides of the plate 310. These protrusions connect to the inner wall of the first wall 130 to secure the plate 310 within the battery case 100. Furthermore, the design of two sets of protrusions located on opposite sides of the plate 310 improves the reliability of the connection between the plate 310 and the inner wall of the battery case 100, ensuring smooth insertion of the electrode assembly 10. Furthermore, this structural design creates a gap between the plate 310 and the inner wall of the first wall 130. When high-pressure gas is generated within the battery case 100, it flows through the through-holes 311 in the plate 310 into this gap. This structural design creates an exhaust space between the interior of the battery case 100 and the explosion-proof valve 200, allowing the high-pressure gas within the battery case 100 to flow to the explosion-proof valve 200 more smoothly, thereby improving the safety of the battery cells. In actual applications, when multiple battery cells are assembled into a battery module, the explosion-proof valve 200 is typically located below the battery cells, i.e., the wall with the explosion-proof hole 110 is located at the bottom of the battery case 100. The two sets of protruding structures are located on opposite sides of the plate 310, and the protruding structures are connected to the inner wall of the first wall 130, so that the plate 310 supports the electrode group 10 in the battery case 100. It is understood that in other embodiments, the protruding structures may also be connected to other inner walls of the battery case 100, which will not be described in detail here.

[0055] Further, if Figures 1 to 4 As shown, the protruding structure includes a plurality of protruding portions 320, which are spaced apart along the first direction D1 to improve the reliability of the connection between the protruding structure and the inner wall of the first wall 130. Preferably, the plurality of protruding portions 320 are evenly distributed along the first direction D1 to improve the uniformity of the connection between the protruding structure and the inner wall of the first wall 130.

[0056] Alternatively, as Figures 1 to 4As shown, the battery case 100 includes four walls, which are connected end to end to form a cavity, and the electrode group 10 is disposed in the cavity. The thickness of each of the four walls is a, 0.2mm≤a≤0.8mm. For example, a can be 0.2mm, 0.25mm, 0.35mm, 0.4mm, 0.5mm, 0.6mm, 0.75mm, or 0.8mm. It can be seen that the technical solution provided in this embodiment can maintain the thickness of the wall within a relatively thin range, which is conducive to reducing the weight of the battery case 100.

[0057] In this embodiment, the four walls are grouped in pairs, and the width of one group of walls is smaller than that of the other group of walls. The explosion-proof hole 110 and the connecting structure 120 are both located on the wall with the smaller width, that is, the width of the first wall 130 is smaller, so that the position of the explosion-proof valve 200 is suitable for the grouping requirements of battery modules that are more common on the market.

[0058] Alternatively, as Figures 1 to 4 As shown, the edge thickness of the explosion-proof valve 200 is the same as the thickness of the first wall 130, that is, the thickness of the edge of the explosion-proof valve 200 is a, and the thickness of the middle area of ​​the explosion-proof valve 200 is less than the thickness of the edge of the explosion-proof valve 200. After the explosion-proof valve 200 is placed on the side of the second connecting portion 122 away from the internal space of the battery shell 100, the edge of the explosion-proof valve 200 and the edge of the explosion-proof hole 110 are seam-welded to seal the explosion-proof valve 200 in the explosion-proof hole 110.

[0059] Alternatively, as Figures 1 to 4 As shown, the thickness of the protrusion 320 protruding from the surface of the plate body 310 is b, and the thickness of the first connecting portion 121 protruding from the inner wall of the first wall 130 is c, where b ≥ c. It can be understood that when b > c, the plate body 310 and the first connecting portion 121 are spaced apart, and when b = c, the plate body 310 and the first connecting portion 121 are in contact. In this embodiment, b > c, so that an assembly gap is formed between the plate body 310 and the first connecting portion 121.

[0060] Optionally, the difference between b and c is preferably about 0.1 mm, which does not occupy too much internal space of the battery shell 100 and forms an assembly gap between the plate body 310 and the first connecting portion 121 .

[0061] Optionally, in actual production, the explosion-proof hole 110, the first connecting portion 121, and the second connecting portion 122 can be formed on the battery shell 100 by punching and stamping, so that c is equal to a. Of course, in other embodiments, c and a may not be equal, and other processes may be used to form the explosion-proof hole 110, the first connecting portion 121, and the second connecting portion 122 on the battery shell 100, which are not listed here one by one.

[0062] Optionally, the thickness of the plate 310 is d, preferably 0.3 mm, which can ensure that the plate 310 has a certain structural strength to support the electrode group 10 while not occupying too much internal space of the battery shell 100.

[0063] Optionally, the total height of the partition is e, e=b+d, 0.6mm≤e≤1.2mm. For example, e can be 0.6mm, 0.65mm, 1.15mm or 1.2mm, etc., which can ensure that the partition has a certain structural strength to support the electrode group 10 without occupying too much internal space of the battery shell 100.

[0064] Alternatively, as Figures 1 to 4 As shown, the protrusion 320 is spaced apart from the first connection portion 121 to facilitate the installation of the separator into the battery case 100. Furthermore, the spacing between the protrusion 320 and the first connection portion 121 is f, f ≥ 0.5 mm, for example, f can be 0.5 mm, 0.55 mm or 0.6 mm.

[0065] Optionally, the width of the protrusion 320 is g, g≥1.0 mm. For example, g may be 1.0 mm, 1.5 mm, or 2.0 mm, so that the protrusion 320 has a certain structural strength.

[0066] Optionally, the four walls of the battery shell 100 are connected by rounded corners, and the spacing between the protrusion 320 and the edge of the inner rounded corner adjacent to the inner wall of the first wall 130 is h, h≥0.5mm, for example, h can be 0.5mm, 0.55mm or 0.6mm, etc., so that the protrusion 320 and the inner rounded corner do not interfere with each other, thereby improving the reliability of the connection between the protrusion 320 and the inner wall of the first wall 130.

[0067] Furthermore, the distance between the first connection portion 121 and the edge of the inner rounded corner is i, i=f+g+h, i≥2.0 mm. For example, i can be 2.0 mm, 2.5 mm, or 3.0 mm.

[0068] Optionally, after the explosion-proof valve 200 and the edge of the explosion-proof hole 110 are welded, the airtightness of the explosion-proof valve 200 needs to be tested. The specific testing method adopts the commonly used method in the field, for example, the sealing ring 20 is set on the outer wall of the battery shell 100 and the sealing ring 20 is located at the outer edge of the explosion-proof hole 110, and then a helium test is performed. In order to ensure the reliability of the airtightness test, Figure 5As shown, the distance between the edge of the outer rounded corner adjacent to the outer wall of the first wall body 130 and the edge of the explosion-proof hole 110 is j, the distance between the inner wall of the sealing ring 20 and the edge of the explosion-proof hole 110 is k, the distance between the outer wall of the sealing ring 20 and the edge of the above-mentioned outer rounded corner is n, the width of the sealing ring 20 is m, and the width of the weld formed by the edge seam welding of the explosion-proof valve 200 and the explosion-proof hole 110 is p (not shown in the figure), wherein j=p÷2+k+n+m, so as to ensure the reliability of the connection between the sealing ring 20 and the outer wall of the first wall body 130, thereby ensuring the reliability of the airtightness detection of the explosion-proof valve 200. In this embodiment, k≥0.5mm, for example, k can be 0.5mm, 0.55mm or 0.6mm, etc., n≥0.5mm, for example, n can be 0.5mm, 0.55mm or 0.6mm, etc., m≥1.0mm, for example, m can be 1.0mm, 1.5mm, or 2.0mm, etc., p≥1.0mm, for example, p can be 1.0mm, 1.5mm, or 2.0mm, etc., j≥2.5mm, for example, j can be 2.5mm, 3.0mm or 3.5mm, etc.

[0069] This embodiment also provides a battery cell having a high energy density, and the explosion-proof valve 200 of the battery cell has a low risk of being impacted by external factors.

[0070] Specifically, if Figure 3 As shown, the battery cell includes an electrode group 10 and the above-mentioned battery shell assembly, and the electrode is arranged in the battery shell 100. The battery cell adopts the above-mentioned battery shell assembly, and there is no need to increase the wall thickness of the battery shell 100, and there is no need to set a boss on the outer wall of the battery shell 100. The explosion-proof valve 200 can be set on the battery shell 100, which is beneficial to improving the energy density of the battery cell and reducing the risk of the explosion-proof valve 200 being affected by external factors and being impacted.

[0071] Example 2

[0072] This embodiment provides a battery housing assembly. The following mainly describes the differences between this embodiment and the previous embodiment, and the similarities are not repeated here.

[0073] like Figure 6 As shown, the explosion-proof valve 200 is provided with a limiting portion 210, which extends along the circumference of the explosion-proof valve 200 and is connected end to end. The second connecting portion 122 extends along the circumference of the explosion-proof hole 110 and is connected end to end. The limiting portion 210 and the second connecting portion 122 are fitted together on one side of the axis of the explosion-proof hole 110 to achieve a good limiting effect on the explosion-proof valve 200.

[0074] When assembling the explosion-proof valve 200 and the battery shell 100, the edge of the explosion-proof valve 200 is placed on the side of the second connecting portion 122 facing away from the interior of the battery shell 100, and the explosion-proof valve 200 is limited by the limiting portion 210 and the second connecting portion 122. Then, the edge of the explosion-proof valve 200 and the edge of the explosion-proof hole 110 are seam-welded to seal the explosion-proof valve 200 in the explosion-proof hole 110.

[0075] Example 3

[0076] This embodiment provides a battery housing assembly. The following mainly describes the differences between this embodiment and the previous embodiment, and the similarities are not repeated here.

[0077] like Figure 7 As shown, the connection structure 120 includes a connection area 123, which is an area on the inner wall of the battery shell 100 located at the edge of the explosion-proof hole 110. The edge of the explosion-proof valve 200 is fixedly connected to the connection area 123 to fix the explosion-proof valve 200 on the inner wall of the battery shell 100.

[0078] Further, if Figure 7 As shown, the connection structure 120 also includes a third connection portion 124, which is adjacent to the connection area 123 and connected to the inner wall of the battery shell 100. The third connection portion 124 extends along the circumference of the explosion-proof hole 110 and is connected end to end. The side wall of the explosion-proof valve 200 is in contact with the third connection portion 124 to provide a good limiting effect on the explosion-proof valve 200.

[0079] When assembling the explosion-proof valve 200 and the battery shell 100, the edge of the explosion-proof valve 200 is fitted with the connection area 123, and the explosion-proof valve 200 is limited by the third connection portion 124. Then, the explosion-proof valve 200 and the connection area 123 are penetrated and welded on the outside of the battery shell 100 so that the explosion-proof valve 200 is sealed in the explosion-proof hole 110.

[0080] Example 4

[0081] This embodiment provides a battery housing assembly. The following mainly describes the differences between this embodiment and the previous embodiment, and the similarities are not repeated here.

[0082] like Figure 8 As shown, the protruding structure includes a protruding portion 320 , and the protruding portion 320 extends in a strip shape along the first direction D1 to improve the reliability of the connection between the protruding structure and the inner wall of the first wall 130 .

[0083] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery housing assembly, characterized in that: include: A battery shell (100), wherein the battery shell (100) is provided with an explosion-proof hole (110), a connecting structure (120) is provided on the inner wall of the battery shell (100), and the connecting structure (120) is distributed along the circumference of the explosion-proof hole (110); An explosion-proof valve (200) is provided, wherein the explosion-proof valve (200) is sealed at the explosion-proof hole (110), and the explosion-proof valve (200) is connected to the connection structure (120).

2. The battery housing assembly according to claim 1, wherein: The connection structure (120) includes a first connection portion (121) and a second connection portion (122), wherein the first connection portion (121) is arranged on the inner wall of the battery shell (100), the second connection portion (122) is connected to the first connection portion (121), and the second connection portion (122) extends in a direction toward the axis of the explosion-proof hole (110), and the explosion-proof valve (200) is arranged on the second connection portion (122).

3. The battery housing assembly according to claim 2, wherein: The side of the explosion-proof valve (200) facing away from the second connecting portion (122) is flush with the outer wall of the battery shell (100); or, the side of the explosion-proof valve (200) facing away from the second connecting portion (122) is recessed into the outer wall of the battery shell (100); And / or, the explosion-proof valve (200) is provided with a convex limiting portion (210), the limiting portion (210) extends along the circumference of the explosion-proof valve (200) and is connected end to end, the second connecting portion (122) extends along the circumference of the explosion-proof hole (110) and is connected end to end, and the limiting portion (210) and the second connecting portion (122) are in contact with one side of the axis of the explosion-proof hole (110).

4. The battery housing assembly according to claim 1, wherein: The connection structure (120) includes a connection area (123), and the connection area (123) is an area on the inner wall of the battery shell (100) located at the edge of the explosion-proof hole (110).

5. The battery housing assembly according to claim 4, wherein: The connection structure (120) further includes a third connection portion (124), the third connection portion (124) being adjacent to the connection region (123) and connected to the inner wall of the battery shell (100), the third connection portion (124) extending along the circumference of the explosion-proof hole (110) and connected end to end, and the side wall of the explosion-proof valve (200) being in contact with the third connection portion (124).

6. The battery housing assembly according to any one of claims 1 to 5, characterized in that: The battery shell assembly further includes a partition, the partition including a plate body (310), the battery shell (100) is provided with a wall body of the explosion-proof hole (110) being a first wall body (130), the plate body (310) is connected to the inner wall of the battery shell (100) and is parallel to the first wall body (130), in a first direction (D1), the size of the plate body (310) is equal to the size of the first wall body (130), the first direction (D1) is configured as the direction in which the electrode group (10) enters the battery shell (100), and the connecting structure (120) is located between the plate body (310) and the inner wall of the first wall body (130).

7. The battery housing assembly according to claim 6, wherein: The partition further comprises two groups of protruding structures, the two groups of protruding structures being respectively located on two opposite sides of the plate body (310) and connected, and the protruding structures being connected to the inner wall of the first wall body (130).

8. The battery housing assembly according to claim 7, wherein: The protruding structure comprises a protruding portion (320), and the protruding portion (320) extends along the first direction (D1); Alternatively, the protruding structure includes a plurality of protruding portions (320), and the plurality of protruding portions (320) are arranged at intervals along the first direction (D1).

9. The battery housing assembly according to claim 6, wherein: The plate body (310) is provided with a plurality of through holes (311).

10. A battery cell, characterized in that The battery cell comprises a pole group (10) and a battery housing assembly according to any one of claims 1 to 9, wherein the pole group (10) is arranged in the battery housing (100).

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