Battery shell assembly and battery

Abstract

The invention relates to the technical field of batteries, and particularly discloses a battery shell assembly and a battery, and the battery shell assembly comprises a shell, an anti-explosion valve and a welding ring. A mounting hole is formed in one side face of the shell, the anti-explosion valve is arranged in the mounting hole, and the circumferential side wall of the anti-explosion valve is attached to the inner wall of the mounting hole in the radial direction of the mounting hole to form a seam. The welding ring is located in the shell, and the projection of the welding ring on the shell in the axial direction of the mounting hole can cover the joint. During assembly, the welding ring, the anti-explosion valve and the inner wall of the mounting hole are welded from the outer side of the shell along the position of the joint to form a welding part. The connection position between the anti-explosion valve and the shell is well supported through the welding ring, and the structural strength of the battery shell assembly is high. In addition, through the welding ring, it can be guaranteed that the welding quality between the anti-explosion valve and the shell is good, and the welding strength is high. The invention also provides a battery which comprises the battery shell assembly.

Description

Technical Field

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

[0002] In order to improve the safety performance of a battery, an explosion-proof valve is generally provided on the cover plate of the battery. When a large amount of gas is generated inside the battery during abnormal operation, the gas can be discharged through the explosion-proof valve to avoid causing a major safety accident. However, a pole is also integrated on the cover plate, so the distance between the explosion-proof valve and the pole is relatively close. When the battery undergoes thermal runaway and the explosion-proof valve is opened, the circuit connection position of the battery and the pressure relief position of the explosion-proof valve are on the same side of the battery, and there is a risk of mutual influence during pressure relief, resulting in fire and explosion.

[0003] Therefore, in the prior art, a technical solution of arranging the explosion-proof valve on the housing has emerged, so as to separate the circuit connection position of the battery and the pressure relief position of the explosion-proof valve as much as possible to ensure the safety of the battery. However, since the thickness of the housing is generally relatively thin, it is difficult to weld the explosion-proof valve to the housing, the welding quality is poor, airtightness problems are likely to occur at the welding position of the explosion-proof valve and the housing, the welding yield is relatively low, and at the same time, the structural strength at the opening position of the housing where the explosion-proof valve is installed cannot be guaranteed, and the reliability of the battery is relatively low. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery housing assembly and a battery, in which a welding ring inside the housing is welded and fixed together with the explosion-proof valve and the housing. The welding quality between the housing and the explosion-proof valve is good, the welding yield is relatively high, meeting the airtightness requirements of the battery, and the connection position between the explosion-proof valve and the housing can be supported through the welding ring, with relatively high structural strength and high reliability of the battery.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] On the one hand, the present invention provides a battery housing assembly, including:

[0007] A housing, the inside of the housing is hollow, and an installation hole is provided on the housing;

[0008] An explosion-proof valve, arranged in the installation hole, and the circumferential side wall of the explosion-proof valve is attached to the inner wall of the installation hole along the radial direction of the installation hole to form a joint;

[0009] A welding ring, located inside the housing, and the projection of the welding ring on the housing along the axial direction of the installation hole covers the joint; the end face of the welding ring facing the housing side, the circumferential side wall of the explosion-proof valve, and the inner wall of the installation hole are welded to form a welding part;

[0010] Wherein, along the radial direction of the mounting hole, the distance between the outer peripheral side wall of the welding ring away from the mounting hole and the joint is a, and the value range of a is: 0.5mm≤a≤3mm;

[0011] Along the radial direction of the mounting hole, the distance between the inner peripheral side wall of the welding ring close to the mounting hole and the joint is b, and the value range of b is 0.5mm≤b≤3mm.

[0012] Optionally, along the axial direction of the mounting hole, the thickness of the shell is H, and the penetration depth of the welding portion is h;

[0013] Among them, the relationship between h and H satisfies: 1.5≤h / H≤2.0;

[0014] The value range of H is: 0.15mm≤H≤1mm.

[0015] Optionally, along the axial direction of the mounting hole, the thickness of the welding ring is H1, and h, H and H1 satisfy: H1>hH.

[0016] Optionally, a weld width of the welding portion along a radial direction of the mounting hole is w, and a relationship between h and w satisfies: 1.0≤h / w≤2.0.

[0017] Optionally, along the axial direction of the mounting hole, the maximum deformation at the welding portion is S, and the value range of S is S≥3.0 mm;

[0018] The helium leak detection rate at the welding part is less than 1×10- 7 Pa·m 3 / s.

[0019] Optionally, the explosion-proof valve includes a valve body and a connecting portion, the circumferential side wall of the connecting portion is in contact with the inner wall of the mounting hole to form the joint; the width of the connecting portion along the radial direction of the mounting hole is C, and the value range of C is 1.5mm≤C≤5mm.

[0020] Optionally, a weak portion is provided on the valve body, and a distance between a side of the weak portion close to the connecting portion and a circumferential side wall of the connecting portion is D, and a value range of D is 2.5 mm ≤ D ≤ 10 mm.

[0021] Optionally, the shell includes two oppositely disposed first side surfaces and two oppositely disposed second side surfaces, the first side surfaces and the second side surfaces form a cylindrical structure, openings are formed on opposite sides of the shell, the area of the first side surface is larger than the area of the second side surface, and the mounting hole is arranged on the second side surface.

[0022] Optionally, the housing includes two oppositely arranged first sides, two oppositely arranged second sides, and a third side. The third side is connected to both the first side and the second side. The first side, the second side, and the third side enclose a shell-like structure. An opening is formed on one side of the housing. The area of the first side is larger than the areas of the second side and the third side. The mounting hole is provided on the second side and / or the third side.

[0023] On the other hand, the present invention provides a battery, including a cover plate and the battery housing assembly in any of the above solutions. The cover plate is connected to the opening of the housing of the battery housing assembly, and the cover plate and the housing form a closed accommodation cavity.

[0024] The beneficial effects of the present invention are as follows:

[0025] The present invention provides a battery housing assembly, including a housing, an explosion-proof valve, and a welding ring. A mounting hole is provided on one of the sides of the housing. The explosion-proof valve is arranged in the mounting hole, and the circumferential side wall of the explosion-proof valve fits with the inner wall of the mounting hole along the radial direction of the mounting hole to form a joint. The welding ring is located inside the housing, and the projection of the welding ring on the housing along the axial direction of the mounting hole can cover the joint. During assembly, the welding ring, the explosion-proof valve, and the inner wall of the mounting hole are welded together to form a welded part. Thus, without increasing the thickness of the housing, the explosion-proof valve can be stably fixed to the housing. The welding ring can provide good support for the connection position between the explosion-proof valve and the housing to ensure that the structural strength of the connection position between the explosion-proof valve and the housing is relatively high. And due to the setting of the welding ring, it can be ensured that the penetration depth of the welded part is large enough and the welding ring will not be welded through. The welding quality between the explosion-proof valve and the housing is relatively good, and the welding strength is relatively high, meeting the airtightness requirements of the battery housing assembly.

[0026] The present invention also provides a battery, including a cover plate and the above battery housing assembly. The cover plate is connected to the housing of the battery housing assembly, and a closed accommodation cavity is formed by the cover plate and the housing. Through the setting of the welding ring in the above battery housing assembly, it can be ensured that the welding quality between the housing and the explosion-proof valve is good, the welding yield is relatively high, the airtightness of the battery is good, and the welding ring can support the connection position between the explosion-proof valve and the housing, with relatively high structural strength and high reliability of the battery. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the content of the embodiments of the present invention and these drawings.

[0028] Figure 1 Explosion diagram of the battery housing assembly provided in the embodiment of the present invention;

[0029] Figure 2 Top view of the battery housing assembly provided in the embodiment of the present invention;

[0030] Figure 3 is Figure 2 Cross-sectional view of the A-A section in

[0031] Figure 4 is Figure 3 Partial enlarged view at B in

[0032] Figure 5 Partial structural schematic diagram of the housing, explosion-proof valve and welding ring after welding in the embodiment of the present invention;

[0033] Figure 6 Partial structural schematic diagram of the housing, explosion-proof valve and welding ring after ball impact test in the embodiment of the present invention.

[0034] In the figure:

[0035] 100, housing; 110, first side; 120, second side; 101, opening; 102, mounting hole; 200, explosion-proof valve; 210, valve body; 211, weak part; 220, connecting part; 221, joint; 300, welding ring; 310, outer peripheral side wall; 320, inner peripheral side wall; 400, welding part. Detailed implementation manners

[0036] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0038] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, 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 should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0040] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "arranged" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. 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 circumstances.

[0041] 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 additional 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 indicates 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 indicates that the horizontal height of the first feature is lower than that of the second feature.

[0042] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0043] As Figures 1-4As shown, this embodiment provides a battery housing assembly, which includes a housing 100, an explosion-proof valve 200, and a welding ring 300. The interior of the housing 100 is hollow and has an opening 101 on at least one side, and an installation hole 102 is provided on one of the side surfaces of the housing 100. The explosion-proof valve 200 is disposed in the installation hole 102, and the circumferential side wall of the explosion-proof valve 200 abuts against the inner wall of the installation hole 102 along the radial direction of the installation hole 102 to form a joint 221. The welding ring 300 is located inside the housing 100, and the projection of the welding ring 300 on the housing 100 along the axial direction of the installation hole 102 can cover the joint 221. Wherein, the radial direction of the installation hole 102 is Figure 1 the X-axis direction and the Y-axis direction shown in Figure 1 and the axial direction of the installation hole 102 is the Z-axis direction shown in

[0044] During assembly, first place the welding ring 300 inside the housing 100 and make the welding ring 300 coaxial with the installation hole 102, then insert the explosion-proof valve 200 into the installation hole 102. At this time, the circumferential side wall of the explosion-proof valve 200 abuts against the inner wall of the installation hole 102 to form a joint 221. Weld the welding ring 300, the explosion-proof valve 200, and the inner wall of the installation hole 102 together from the outside of the housing 100 along the position where the joint 221 is located, and a welding part 400 is formed between the end face of the welding ring 300 facing the housing 100, the circumferential side wall of the explosion-proof valve 200, and the inner wall of the installation hole 102. It should be noted that when welding, it is necessary to ensure that the welding ring 300 is not welded through. Optionally, the welding ring 300, the explosion-proof valve 200, and the housing 100 are made of the same material. For example, all three can be made of aluminum, or all three can be made of stainless steel material, which is not limited here.

[0045] Thus, without increasing the thickness of the housing 100, the explosion-proof valve 200 can also be stably fixed to the housing 100. The welding ring 300 can provide good support for the connection position between the explosion-proof valve 200 and the housing 100, ensuring a relatively high structural strength at the connection position between the explosion-proof valve 200 and the housing 100. Moreover, due to the provision of the welding ring 300, the penetration depth during the welding of the explosion-proof valve 200 and the housing 100 can be increased, and there is sufficient material at the welding position of the explosion-proof valve 200 and the housing 100 to form a relatively large molten pool, ensuring better welding quality and relatively high welding strength, meeting the airtightness requirements of the battery housing assembly. In addition, the provision of the welding ring 300 can also play a certain protective role, preventing damage to the electrode group arranged inside the housing 100 during full penetration welding.

[0046] See Figure 3 and Figure 4 In this embodiment, as shown in FIGS. and, the welding ring 300 includes an outer peripheral side wall 310 and an inner peripheral side wall 320. Along the radial direction of the mounting hole 102, the distance between the outer peripheral side wall 310 on the side of the welding ring 300 facing away from the mounting hole 102 and the joint 221 is a, and the value range of a is: 0.5 mm ≤ a ≤ 3 mm. For example, the value of a can be 0.5 mm, 0.8 mm, 1.0 mm, 2.0 mm, 3.0 mm, etc. Along the radial direction of the mounting hole 102, the distance between the inner peripheral side wall 320 on the side of the welding ring 300 close to the mounting hole 102 and the joint 221 is b, and the value range of b is 0.5 mm ≤ b ≤ 3 mm. For example, the value of b can be 0.5 mm, 0.8 mm, 1.0 mm, 2.0 mm, 3.0 mm, etc. By controlling the values of a and b within the above ranges, it can be ensured that the welding ring 300 provides good support for the connection position (i.e., the joint 221) between the housing 100 and the explosion-proof valve 200, and meets the welding requirements of the welding ring 300, the housing 100, and the explosion-proof valve 200, ensuring that the welding ring 300 can provide sufficient material so that a relatively large molten pool can be formed at the welding position of the explosion-proof valve 200 and the housing 100, ensuring better welding quality and relatively high welding strength, and ensuring good sealing and relatively high pressure resistance at the connection position between the housing 100 and the explosion-proof valve 200 after welding.

[0047] See Figure 5, along the axial direction of the mounting hole 102, the thickness of the housing 100 is H, and the penetration depth of the welding portion 400 is h. The relationship between h and H satisfies: 1.5 ≤ h / H ≤ 2.0. For example, the value of h / H can be 1.5, 1.6, 1.7, 1.8, 1.9 or 2.0, etc. The value range of H is: 0.15 mm ≤ H ≤ 1 mm. For example, in some embodiments, when the value of H is 0.15 mm, the value of h can be 0.225 mm, 0.25 mm, 0.27 mm or 0.3 mm, etc. In other embodiments, when the value of H is 1.0 mm, the value of h can be 1.5 mm, 1.7 mm, 1.8 mm or 2.0 mm, etc., which are not listed one by one here. By controlling the value of h / H within the above range, the welding strength and welding quality of the welding portion 400 meet the airtightness requirements of the battery housing assembly. Otherwise, when the value of h / H is too small, the penetration depth of the welding portion 400 is insufficient, and the connection strength between the welding ring 300 and the housing 100 and the explosion-proof valve 200 is poor, affecting the airtightness and reliability of the battery housing assembly. Of course, the value of h / H should not be too large either, otherwise it will cause waste of the internal space of the housing 100, reduce the layout space of the electrode group, and is not conducive to improving the energy density of the battery.

[0048] Further, along the axial direction of the mounting hole 102, the thickness of the welding ring 300 is H1, and the relationship among h, H and H1 satisfies: H1 > h - H. That is to say, the penetration depth of the welding portion 400 cannot be greater than the sum of the thicknesses of the welding ring 300 and the housing 100. This is to ensure that the welding ring 300 will not be penetrated during welding, avoiding damage to the electrode group inside the housing 100. Exemplarily, the value range of H1 in this embodiment is: 0.15 mm ≤ H1 ≤ 3 mm. For example, when H is 0.15 mm and h / H is 1.5, H1 can be 0.15 mm, 0.2 mm, 0.3 mm or 0.5 mm. When H is 1.0 mm and h / H is 2.0, H1 can be 1.5 mm, 2.0 mm, 2.5 mm or 3 mm. Of course, the value of H1 should not be too large either, otherwise it will occupy a large space inside the housing 100, affect the layout of the electrode group, and is not conducive to improving the energy density of the battery.

[0049] Continue to refer to Figure 5 , the fusion width of the welding portion 400 along the radial direction of the mounting hole 102 is w, and the relationship between h and w satisfies: 1.0 ≤ h / w ≤ 2.0. For example, the value of h / w can be 1.0, 1.5 or 2.0. Controlling the value of h / w within the above range is to ensure good welding quality of the welding portion 400, high welding yield, and reliable connection between the explosion-proof valve 200 and the housing 100.

[0050] Continue to refer to Figure 1 and Figure 4The explosion-proof valve 200 in this embodiment includes a valve body 210 and a connecting portion 220, and the circumferential side wall of the connecting portion 220 is attached to the inner wall of the mounting hole 102 to form a joint 221. Along the axial direction of the mounting hole 102, the thickness of the connecting portion 220 is equal to the thickness of the shell 100, and the end surface of the connecting portion 220 facing away from the welding ring 300 is flush with the end surface of the shell 100 facing away from the welding ring 300, thereby making the surface of the explosion-proof valve 200 and the shell 100 after welding relatively flat, and the welding portion 400 will not protrude too much from the end surface of the shell 100 facing away from the welding ring 300, and the appearance of the battery shell assembly is good.

[0051] As an optional solution, in this embodiment, the width of the connecting portion 220 along the radial direction of the mounting hole 102 is C, and the value range of C is 1.5mm≤C≤5mm. For example, the value of C can be 1.5mm, 2.0mm, 3.0mm, 4.0mm or 5.0mm, etc. The value of C is controlled within the above range in order to increase the contact area between the explosion-proof valve 200 and the welding ring 300, to improve the supporting effect of the welding ring 300 on the explosion-proof valve 200, to ensure that the welding quality of the explosion-proof valve 200 and the inner wall of the mounting hole 102 on the housing 100 is good and the welding strength is high. In addition, it is also to facilitate the processing and manufacturing of the explosion-proof valve 200 and meet the requirements of the explosion-proof valve 200 for the manufacturing process.

[0052] Further, a weak part 211 is provided on the valve body 210. For example, the weak part 211 can be a notch formed on the valve body 210 by machining, and the thickness of the valve body 210 is thinned at the position where the notch is located. Therefore, when the air pressure inside the housing 100 is too high, the weak part 211 can be broken through to form an exhaust passage on the valve body 210, thereby realizing the pressure relief function of the explosion-proof valve 200. Optionally, both the weak part 211 and the connecting part 220 in this embodiment are annular, the weak part 211 and the connecting part 220 are both coaxially arranged with the mounting hole 102, and the distance between the side of the weak part 211 close to the connecting part 220 and the circumferential side wall of the connecting part 220 (i.e., at the joint 221 between the explosion-proof valve 200 and the mounting hole 102) is D. Optionally, the value range of D is 2.5mm ≤ D ≤ 10mm. Exemplarily, the value of D can be 2.5mm, 3.0mm, 4.0mm, 6.0mm, 8.0mm or 10.0mm, etc. By controlling the value of D within the above range, the weak part 211 can be prevented from being affected by the heat of welding during the welding of the explosion-proof valve 200 and the housing 100, and deformation caused by heating can be avoided. The opening pressure of the explosion-proof valve 200 is stable and the service life is longer. Otherwise, when the value of D is too small, the distance between the side of the weak part 211 close to the connecting part 220 and the circumferential side wall of the connecting part 220 is relatively close, and it is easily affected by the heat generated by welding and deformed. The opening pressure of the explosion-proof valve 200 is unstable and the service life is shortened. Of course, the value of D should not be too large either, otherwise the area enclosed by the weak part 211 is small, that is, the flow area of the exhaust passage formed on the valve body 210 is small, the exhaust efficiency is low, and the exhaust requirements of the battery in an emergency cannot be met, resulting in a decrease in the safety of the battery.

[0053] Continue to refer to Figure 1 and Figure 2 , in this embodiment, the housing 100 includes two relatively arranged first side surfaces 110 and two relatively arranged second side surfaces 120. The first side surfaces 110 and the second side surfaces 120 enclose a cylindrical structure. Openings 101 are formed on both opposite sides of the housing 100. The area of the first side surface 110 is larger than that of the second side surface 120. The mounting hole 102 is arranged on one of the second side surfaces 120. Thus, the circuit connection position of the battery is separated from the pressure relief position of the explosion-proof valve 200 (generally, the circuit connection position is arranged on the cover plate), and the safety of the battery is improved.

[0054] Alternatively, in other embodiments, the housing 100 includes two relatively arranged first side surfaces 110, two relatively arranged second side surfaces 120, and a third side surface. The third side surface is connected to both the first side surface 110 and the second side surface 120. The first side surface 110, the second side surface 120, and the third side surface enclose a shell-like structure. An opening 101 is formed on one side of the housing 100. The area of the first side surface 110 is larger than the areas of the second side surface 120 and the third side surface. The mounting holes 102 are provided on the second side surface 120 and / or the third side surface. In this solution, the circuit connection position of the battery and the pressure relief position of the explosion-proof valve 200 can also be separated, improving the safety of the battery.

[0055] This embodiment also provides a battery, including a cover plate and the above battery housing assembly. The cover plate is connected to the opening 101 of the housing 100, and a closed accommodation cavity is formed by the cover plate and the housing 100. A pole group can be arranged in the accommodation cavity. The pole tabs of the pole group are electrically connected to the pole columns integrated on the cover plate. The mounting holes 102 of the explosion-proof valve 200 are provided on the housing 100, thereby separating the circuit connection position of the battery from the pressure relief position of the explosion-proof valve 200 and improving the safety of the battery. And by using the battery housing assembly in this embodiment, its welding ring 300 can improve the welding quality between the housing 100 and the explosion-proof valve 200, with a high welding yield, good airtightness of the battery, and the connection position between the explosion-proof valve 200 and the housing 100 can be supported by the welding ring 300, with high structural strength and high reliability of the battery.

[0056] It should be noted that, according to the structure of the housing 100, the number of cover plates provided is equal to the number of openings 101 provided on the housing 100, and the cover plates and the openings 101 correspond one by one, so that the cover plates and the housing 100 can enclose a closed accommodation cavity.

[0057] Next, ball impact tests are performed on samples of the battery housing assembly in some specific implementation schemes to explore the influence of the design dimensions of the housing 100, the welding ring 300, and the explosion-proof valve 200 on their welding quality and welding strength.

[0058] Among them, the steps of the ball impact test include: clamping the first side surface 110 of the housing 100 with a tooling (simulating the state of the battery housing assembly in the battery pack), and using the gravity of the freely falling sphere to impact the connection between the housing 100 and the explosion-proof valve 200 (i.e., the welding part 400). Then, helium leak detection is performed on the battery housing assembly to determine whether the connection between the housing 100 and the explosion-proof valve 200 is hermetically sealed after the ball impact test.

[0059] Specifically, as Figure 6 shown, when the welding part 400 between the housing 100 and the explosion-proof valve 200 is impacted by the sphere, the welding part 400 will bulge in the axial direction of the mounting hole 102 towards the direction close to the pole group.Figure 6 The position of the dashed line in [reference] is the state before the deformation of the housing 100 and the explosion-proof valve 200, and the position of the solid line is the state after the deformation of the housing 100 and the explosion-proof valve 200. As can be seen from [reference] Figure 6 that the center point (point e) of the welding part 400 has the largest deformation compared to before the ball impact test. This is the maximum deformation at the welding part 400, denoted as S.

[0060] If the value of the maximum deformation S at the welding part 400 satisfies: S ≥ 3.0 mm, and at this time the sealing performance of the connection between the housing 100 and the explosion-proof valve 200 (i.e., at the welding part 400) still meets the requirements (taking the helium leak detection rate as the standard, the helium gas leak rate is lower than 1×10 -7 Pa·m 3 / s), it can be judged that the welding quality of the welding part 400 of the battery housing assembly is good and the welding strength is high.

[0061] The detailed dimensions and test results of the battery housing assembly samples are shown in Table 1.

[0062] Table 1

[0063]

[0064] From the above results, it can be known that among samples 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10, the values of the parameters H, H1, h / H, and h / w are all within the set range, and the welding quality of the housing 100, the explosion-proof valve 200, and the welding ring 300 after welding is good and the welding strength is high. After the ball impact test, along the axial direction of the mounting hole 102, the value of the maximum deformation S at the welding part 400 is greater than 3.0 mm, and it passes the helium leak detection, meeting the strength requirements for the welding part 400 of the battery housing assembly and the sealing requirements for the welding part 400. The reliability of the battery housing assembly is high and the product is qualified.

[0065] In samples 11, 12, 13, 14, and 15, the parameter h / H does not meet its set range: 1.5 ≤ h / H ≤ 2.0, and the value of h / H is less than 1.5. After the ball impact test, along the axial direction of the mounting hole 102, the value of the maximum deformation S at its welding part 400 is less than 3.0 mm to pass the helium leak detection, which cannot meet the strength requirements for the welding part 400 of the battery housing assembly and the sealing requirements for the welding part 400, and the product is unqualified.

[0066] In Samples 16 and 17, the parameter h / w does not meet its set range: 1.0 ≤ h / w ≤ 2.0, and the value of h / w is greater than 2.0. After the ball impact test, along the axial direction of the mounting hole 102, the value of the maximum deformation S at the welded part 400 is less than 3.0 mm to pass the helium leak detection. It cannot meet the strength requirement of the battery housing assembly for the welded part 400 and the sealing requirement for the welded part 400, and the product is unqualified.

[0067] In Samples 18, 19, and 20, the parameter h / w does not meet its set range: 1.0 ≤ h / w ≤ 2.0, and the value of h / w is less than 1.0. After the ball impact test, along the axial direction of the mounting hole 102, the value of the maximum deformation S at the welded part 400 is less than 3.0 mm to pass the helium leak detection. It cannot meet the strength requirement of the battery housing assembly for the welded part 400 and the sealing requirement for the welded part 400, and the product is unqualified.

[0068] In summary, when the values of the parameters H, H1, h / H, and h / w are all within the set ranges, the welding quality after welding the housing 100 with the explosion-proof valve 200 and the welding ring 300 can be ensured to be good, the welding strength is high, the strength requirement of the battery housing assembly for the welded part 400 is met, the reliability of the battery is high, and the product is qualified.

[0069] Obviously, the above are only the preferred embodiments of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here, and various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

[0070] Note that in the description of this specification, the descriptions referring to the terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

Claims

1. A battery housing assembly, characterized in that, include: A shell, wherein the interior of the shell is hollow and a mounting hole is provided on the shell; An explosion-proof valve is arranged in the mounting hole, and a circumferential side wall of the explosion-proof valve is attached to an inner wall of the mounting hole along a radial direction of the mounting hole to form a joint; A welding ring is located in the shell, and the projection of the welding ring on the shell along the axial direction of the mounting hole covers the joint; the end surface of the welding ring facing the shell, the circumferential side wall of the explosion-proof valve and the inner wall of the mounting hole are welded to form a welding portion; Wherein, along the radial direction of the mounting hole, the distance between the outer peripheral side wall of the welding ring away from the mounting hole and the joint is a, and the value range of a is: 0.5mm≤a≤3mm; Along the radial direction of the mounting hole, the distance between the inner peripheral side wall of the welding ring close to the mounting hole and the joint is b, and the value range of b is 0.5mm≤b≤3mm.

2. The battery housing assembly according to claim 1, wherein Along the axial direction of the mounting hole, the thickness of the shell is H, and the penetration depth of the welding portion is h; Among them, the relationship between h and H satisfies: 1.5≤h / H≤2.0; The value range of H is: 0.15mm≤H≤1mm.

3. The battery housing assembly according to claim 2, wherein, Along the axial direction of the mounting hole, the thickness of the welding ring is H1, and h, H and H1 satisfy: H1>hH.

4. The battery housing assembly according to claim 2, wherein The weld width of the welding portion along the radial direction of the mounting hole is w; The relationship between h and w satisfies: 1.0≤h / w≤2.

0.

5. The battery housing assembly according to claim 1, wherein Along the axial direction of the mounting hole, the maximum deformation at the welding portion is S, and the value range of S is S≥3.0 mm; And the helium leak detection rate at the welding part is lower than 1×10 -7 Pa·m 3 / s.

6. The battery housing assembly according to claim 1, wherein, The explosion-proof valve comprises a valve body and a connecting portion, wherein the circumferential side wall of the connecting portion is attached to the inner wall of the mounting hole to form the joint, and the width of the connecting portion along the radial direction of the mounting hole is C; The value range of C is 1.5mm≤C≤5mm.

7. The battery housing assembly according to claim 6, characterized in that, A weak portion is provided on the valve body, and a distance D is between a side of the weak portion close to the connecting portion and a circumferential side wall of the connecting portion, and a value range of D is 2.5 mm ≤ D ≤ 10 mm.

8. The battery housing assembly according to claim 1, characterized in that, The shell includes two oppositely arranged first side surfaces and two oppositely arranged second side surfaces, the first side surfaces and the second side surfaces form a cylindrical structure, openings are formed on opposite sides of the shell, the area of the first side surface is larger than the area of the second side surface, and the mounting hole is arranged on the second side surface.

9. The battery housing assembly according to claim 1, wherein, The shell includes two oppositely arranged first side surfaces, two oppositely arranged second side surfaces and a third side surface, the third side surface is connected to both the first side surface and the second side surface, the first side surface, the second side surface and the third side surface form a shell-like structure, an opening is formed on one side of the shell, the area of the first side surface is larger than the area of the second side surface and the third side surface, and the mounting hole is arranged on the second side surface and / or the third side surface.

10. A battery, characterized in that, It comprises a cover plate and a battery housing assembly according to any one of claims 1 to 9, wherein the cover plate is connected to a housing of the battery housing assembly, and the cover plate and the housing form a closed accommodating cavity.

Images