Battery structure assembly and battery

Abstract

The utility model relates to the technical field of energy storage equipment, in particular to a battery structure assembly and a battery, and the battery structure assembly comprises a top cover, an auxiliary welding ring and an anti-explosion valve. The top cover is made of stainless steel, and an anti-explosion hole is formed in the top cover. The auxiliary welding ring comprises an annular part and a tubular part which are connected, the annular part is attached to the first face of the top cover, the tubular part is inserted into the anti-explosion hole, and the end of the tubular part is bent outwards through circumferential rolling to be attached to the second face of the top cover. The anti-explosion valve is circumferentially welded to the inner wall of the tubular part, and the anti-explosion valve and the auxiliary welding ring are both made of aluminum alloy. The battery comprises a shell and the battery structure assembly, the top cover is arranged at the opening of the shell, and the top cover and the shell are connected to form a shell of the battery. According to the battery, the reliability of the explosion-proof valve can be improved on the premise of ensuring the structural strength of the top cover.

Description

TECHNICAL FIELD

[0001] The utility model relates to energy storage equipment technical field especially, relates to a battery structure subassembly and battery. BACKGROUND

[0002] In order to guarantee the use safety of battery, the existing battery generally will weld explosion-proof valve on the top cover. In order to guarantee the structural strength of top cover, generally the top cover of stainless steel material is adopted, and in order to guarantee the welding quality, the explosion-proof valve also needs to be set to stainless steel material. But the explosion-proof valve of stainless steel material is too high in strength, causes its burst pressure to be big, and stability is poor. SUMMARY

[0003] One purpose of the utility model is to provide a battery structure subassembly, can improve the reliability of explosion-proof valve under the premise of guaranteeing the structural strength of top cover.

[0004] In order to achieve the purpose, the utility model adopts the following technical scheme:

[0005] Provide a kind of battery structure subassembly, comprising:

[0006] Top cover, the material of top cover is stainless steel, explosion-proof hole is set on the top cover;

[0007] Auxiliary welding ring, the auxiliary welding ring includes annular portion and tubular portion connected, the annular portion is attached to the first surface of the top cover, the tubular portion is inserted at the explosion-proof hole, and the end of the tubular portion is attached to the second surface of the top cover by circumferential rolling and bending outward;

[0008] Explosion-proof valve, the explosion-proof valve is circumferentially welded to the inner wall of the tubular portion, and the material of the explosion-proof valve and the auxiliary welding ring is aluminum alloy.

[0009] Optionally, it further includes first sealing ring, the first sealing ring is clamped between the first surface and the annular portion, and the first sealing ring is arranged around the explosion-proof hole.

[0010] Optionally, first limiting groove is set on the first surface, and the first sealing ring is located in the first limiting groove;

[0011] And / or, second limiting groove is set on the end face of the annular portion towards the first surface, and the first sealing ring is located in the second limiting groove.

[0012] Optionally, the inner wall of the tubular portion is provided with annular stepped surface, and the explosion-proof valve is welded to the annular stepped surface.

[0013] Optionally, the annular stepped surface faces the outside of battery.

[0014] Optionally, the outer wall of the tubular part is sealingly connected to the inner wall of the explosion-proof hole.

[0015] Optionally, a second sealing ring is further included, the second sealing ring is sleeved on the tubular part and clamped between the tubular part and the inner wall of the explosion-proof hole.

[0016] Optionally, the end of the tubular part is in circumferential sealing contact with the second face after being rolled.

[0017] Optionally, a third sealing ring is further included, the third sealing ring is clamped between the end of the tubular part and the second face, and the third sealing ring surrounds the explosion-proof hole.

[0018] Another purpose of the utility model is to provide a battery which can improve the reliability of the explosion-proof valve while ensuring the structural strength of the top cover.

[0019] To achieve this purpose, the utility model adopts the following technical scheme:

[0020] The utility model provides a battery, including shell and above -mentioned battery structure subassembly, top cover sets at the opening of shell, and top cover is connected with shell and forms the shell of battery.

[0021] The utility model has the advantages of:

[0022] The utility model provides a battery structure subassembly, including top cover, auxiliary welding ring and explosion-proof valve, wherein the material of the top cover is stainless steel, and the explosion-proof hole is formed in the top cover, the auxiliary welding ring includes a ring part and a tubular part connected to each other, the ring part is attached to the first face of the top cover, the tubular part is inserted into the explosion-proof hole, and the end of the tubular part is bent outwardly and attached to the second face of the top cover after being rolled in the circumferential direction, the explosion-proof valve is welded to the inner wall of the tubular part in the circumferential direction, and the materials of the explosion-proof valve and the auxiliary welding ring are both aluminum alloy, by setting the auxiliary welding ring and rolling and fixing the auxiliary welding ring in the explosion-proof hole of the top cover, and welding the explosion-proof valve on the auxiliary welding ring, the top cover and the explosion-proof valve can be made of two different materials, the top cover is made of stainless steel to meet the structural strength requirement, the auxiliary welding ring and the explosion-proof valve are made of aluminum alloy to reduce the structural strength of the explosion-proof valve, ensure the reliability of the explosion-proof valve, reduce the welding thermal stress, ensure that the explosion-proof valve is not damaged during welding, and further ensure the good quality.

[0023] The utility model further provides a battery, including shell and above -mentioned battery structure subassembly, top cover sets at the opening of shell, and top cover is connected with shell and forms the shell of battery. ACCURACY OF DRAWINGS

[0024] Figure 1is a structural schematic view of a battery structure assembly provided by an embodiment of the utility model;

[0025] Figure 2 is an explosion view of a battery structure assembly provided by an embodiment of the utility model;

[0026] Figure 3 is a structural schematic view of an auxiliary welding ring (not rolled) provided by an embodiment of the utility model;

[0027] Figure 4 is a structural schematic view of an auxiliary welding ring (rolled) provided by an embodiment of the utility model;

[0028] Figure 5 is a partial sectional view of a battery structure assembly (before rolling) provided by an embodiment of the utility model;

[0029] Figure 6 is a partial sectional view of a battery structure assembly (after rolling) provided by an embodiment of the utility model.

[0030] In the drawing:

[0031] 1, top cover; 11, explosion-proof hole; 12, second surface;

[0032] 2, auxiliary welding ring; 21, annular part; 211, second limiting groove; 22, tubular part; 221, annular step surface;

[0033] 3, explosion valve; 4, first sealing ring; 5, positive electrode assembly; 6, negative electrode assembly; 7, lower plastic. DETAILED DESCRIPTION

[0034] The technical scheme of the utility model will be further described below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings, not all.

[0035] In the description of the utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, and can be detachable connection; it can be mechanical connection, and can be electrical connection; it can be directly connected, and can be indirectly connected through intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] In the utility model, unless another definite stipulation and limitation, the first feature is "on" or "under" the second feature, which can include the first and second features directly contact, or can include the first and second features are not directly contact but contact through other features between them. Moreover, the first feature "on", "above" and "on the" the second feature includes the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is less than the second feature in horizontal height.

[0037] In order to guarantee the safety of battery use, the existing battery generally welds the explosion-proof valve on the top cover. In order to guarantee the structural strength of the top cover, the top cover of stainless steel material is generally used, and in order to guarantee the welding quality, the explosion-proof valve also needs to be set to stainless steel material. But the explosion-proof valve of stainless steel material is too high in strength, which makes its burst pressure large and stability poor.

[0038] To solve the above problems, the embodiment provides a battery structure assembly which can improve the reliability of the explosion-proof valve under the premise of guaranteeing the structural strength of the top cover.

[0039] As shown in Figures 1-6 The battery structure assembly of the embodiment comprises a top cover 1, an auxiliary welding ring 2 and an explosion-proof valve 3. The material of the top cover 1 is stainless steel, and the top cover 1 is provided with an explosion-proof hole 11. The auxiliary welding ring 2 comprises a ring-shaped part 21 and a tubular part 22 connected with each other, the ring-shaped part 21 is attached to a first surface of the top cover 1, the tubular part 22 is inserted at the explosion-proof hole 11, and the end of the tubular part 22 is circumferentially rolled outward and attached to a second surface 12 of the top cover 1. The explosion-proof valve 3 is circumferentially welded to the inner wall of the tubular part 22, and the materials of the explosion-proof valve 3 and the auxiliary welding ring 2 are both aluminum alloy.

[0040] By setting the auxiliary welding ring 2 and rolling and fixing the auxiliary welding ring 2 at the explosion-proof hole 11 of the top cover 1, and welding the explosion-proof valve 3 on the auxiliary welding ring 2, the top cover 1 and the explosion-proof valve 3 can be selected to use two different materials, the top cover 1 is set to stainless steel material to meet the structural strength requirement, the auxiliary welding ring 2 and the explosion-proof valve 3 are set to aluminum alloy material, the structural strength of the explosion-proof valve 3 is reduced, the reliability is guaranteed, the welding thermal stress is reduced, the explosion-proof valve 3 is not damaged in the welding process, and the quality is further guaranteed.

[0041] In order to prevent the gap between the top cover 1 and the auxiliary welding ring 2 from penetrating the inside and outside of the battery, optionally, the battery structure assembly further comprises a first sealing ring 4, which is clamped between the first surface and the annular portion 21, and is arranged around the explosion-proof hole 11. The first sealing ring 4 can block the gap between the first surface of the top cover 1 and the annular portion 21 of the auxiliary welding ring 2, prevent the penetration of the inside and outside of the battery, and ensure the quality of the battery.

[0042] In order to fix the position of the first sealing ring 4 relative to the first surface, optionally, a first limiting groove is formed on the first surface, and the first sealing ring 4 is located in the first limiting groove. It is known that the first limiting groove is located on the first surface and is arranged around the explosion-proof hole 11.

[0043] In order to fix the position of the first sealing ring 4 relative to the auxiliary welding ring 2, optionally, a second limiting groove 211 is formed on the end surface of the annular portion 21 facing the first surface, and the first sealing ring 4 is located in the second limiting groove 211. It is known that the second limiting groove 211 is coaxially arranged with the annular portion 21.

[0044] Optionally, the inner wall of the tubular portion 22 is provided with an annular stepped surface 221, and the explosion-proof valve 3 is welded to the annular stepped surface 221. Optionally, the annular stepped surface 221 faces the outside of the battery. Optionally, the inner wall of the tubular portion 22 is further provided with another stepped surface, which is further increased in size, so that the explosion-proof valve 3 has a larger operating space when welded to the annular stepped surface 221, facilitating welding.

[0045] Optionally, the outer wall of the tubular portion 22 is sealingly connected to the inner wall of the explosion-proof hole 11, so that a secondary seal between the top cover 1 and the auxiliary welding ring 2 is formed at this position. Optionally, the battery structure assembly further comprises a second sealing ring (not shown in the figure), which is sleeved on the tubular portion 22 and clamped between the tubular portion 22 and the inner wall of the explosion-proof hole 11, to further ensure that the gap between the tubular portion 22 and the inner wall of the explosion-proof hole 11 is blocked.

[0046] Optionally, the end portion of the tubular portion 22 is in circumferential sealing contact with the second surface 12 after being rolled, so that a tertiary seal between the top cover 1 and the auxiliary welding ring 2 is formed at this position. Optionally, the battery structure assembly further comprises a third sealing ring (not shown in the figure), which is clamped between the end portion of the tubular portion 22 and the second surface 12, and the third sealing ring surrounds the explosion-proof hole 11, to further ensure that the gap between the bent tubular portion 22 and the second surface 12 of the explosion-proof hole 11 is blocked.

[0047] In order to fix the position of the third sealing ring relative to the second surface 12, optionally, a third limiting groove (not shown in the figure) is formed on the second surface 12, and the third sealing ring is located in the third limiting groove. It is known that the third limiting groove is located on the second surface 12 and is arranged around the explosion-proof hole 11.

[0048] In order to fix the position of the third sealing ring relative to the auxiliary welding ring 2, optionally, a fourth limiting groove (not shown in the figure) is formed on the outer wall surface of the tubular portion 22, and the third sealing ring is located in the fourth limiting groove of the bent tubular portion 22.

[0049] Optionally, the battery structure assembly further comprises a positive electrode assembly 5, a negative electrode assembly 6 and a lower plastic 7. The positive electrode assembly 5 and the negative electrode assembly 6 are arranged on the top cover 1, and the lower plastic 7 is attached to the side of the top cover 1 facing the inside of the battery. In this embodiment, the first surface of the top cover 1 faces the inside of the battery, and the second surface 12 faces the outside of the battery.

[0050] The assembly process of the battery structure assembly is as follows: first, the auxiliary welding ring 2 is placed in the tooling, then the first sealing ring 4 is placed in the second limiting groove 211 of the auxiliary welding ring 2, and then the top cover 1 made of stainless steel is placed on the auxiliary welding ring 2. Then the auxiliary welding ring 2 is uniformly rolled by the tooling, and the first sealing ring 4 is effectively compressed by the rolling edge to tightly fit the first limiting groove and the second limiting groove 211, forming a reliable sealing surface, which ensures the air tightness of the product. Finally, the explosion-proof valve 3 is welded on the auxiliary welding ring 2, and the explosion-proof valve 3 in this embodiment is an explosion-proof sheet.

[0051] The battery structure assembly with the second sealing ring and the third sealing ring can assemble the second sealing ring and the third sealing ring before rolling. Specifically, the second sealing ring is sleeved on the tubular portion 22 of the auxiliary welding ring 2, the third sealing ring is placed in the third limiting groove of the second surface 12 of the top cover 1, and then the rolling operation is performed, and the subsequent steps are consistent with the above assembly process and will not be repeated.

[0052] The battery structure assembly combines stainless steel and aluminum alloy, and on the basis of maintaining the high strength and corrosion resistance of the top cover 1, the auxiliary welding ring 2 and the explosion-proof valve 3 made of aluminum alloy are used, the welding performance and the design of the explosion-proof valve 3 are improved, and the complementary and improvement of the material performance are realized. The first sealing ring 4 is integrated with the auxiliary welding ring 2 made of aluminum alloy, and the sealing ring is innovatively added in the design of the top cover 1 assembly, which effectively prevents gas leakage between the top cover 1 and the auxiliary welding ring 2. Meanwhile, the auxiliary welding ring 2 made of aluminum alloy is creatively used, which not only solves the compatibility problem between materials, but also significantly improves the sealing performance of the top cover 1 and the reliability of the explosion-proof valve 3. In addition, the auxiliary welding ring 2 made of aluminum alloy can optimize the welding process and effectively reduce the thermal stress in the welding process, thereby avoiding the deformation risk of the top cover 1 made of stainless steel due to high-temperature welding, improving the yield and product quality. Moreover, the combination of the auxiliary welding ring 2 made of aluminum alloy and the explosion-proof valve 3 makes the explosion pressure control of the explosion-proof valve 3 more accurate, and the stability of the explosion value is significantly improved, overcoming the problems of high explosion pressure, difficult accurate control and insufficient stability of the explosion-proof valve 3 made of traditional stainless steel due to high material strength.

[0053] The embodiment also provides a battery comprising a shell and the above-mentioned battery structure assembly, the top cover 1 is arranged at the opening of the shell, and the top cover 1 is circumferentially connected with the shell to form the shell of the battery. The battery can improve the reliability of the explosion-proof valve 3 while ensuring the structural strength of the top cover 1.

[0054] Obviously, the above-mentioned embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or changes can be made on the basis of the above-mentioned description. Here, all the embodiments are not enumerated. Any modification, equivalent replacement and improvement made in the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A battery structure assembly, characterized by, The utility model relates to a battery structure assembly, including: A top cover (1), the material of top cover (1) is stainless steel, and the top cover (1) is set up with explosion -proof hole (11); Auxiliary welding ring (2), auxiliary welding ring (2) include the annular portion (21) and tubular portion (22) of connection, the annular portion (21) is attached to the first surface of top cover (1), the tubular portion (22) is inserted in explosion -proof hole (11), and the end of tubular portion (22) is attached to the second surface (12) of top cover (1) by circumferential rolling and bending outward; Explosion -proof valve (3), explosion -proof valve (3) circumferential welding is in the inner wall of tubular portion (22), and the material of explosion -proof valve (3) and auxiliary welding ring (2) is all aluminum alloy.

2. The battery structural assembly of claim 1, wherein, Still include first sealing ring (4), first sealing ring (4) is clamped between the first surface and the annular portion (21), and first sealing ring (4) is set around explosion -proof hole (11).

3. The battery structural assembly of claim 2, wherein, The first surface is set up with first limiting slot, and first sealing ring (4) is located in first limiting slot; And / or, the end surface of annular portion (21) towards the first surface is set up with second limiting slot (211), and first sealing ring (4) is located in second limiting slot (211).

4. The battery structural assembly of claim 1, wherein, The inner wall of tubular portion (22) is provided with annular step surface (221), and explosion -proof valve (3) is welded on annular step surface (221).

5. The battery structural assembly of claim 4, wherein, Annular step surface (221) is towards the outside of battery.

6. The battery structural assembly of any one of claims 1-5, wherein, The outer wall of tubular portion (22) is sealedly connected to the inner wall of explosion -proof hole (11).

7. The battery structural assembly of claim 6, wherein, Still include second sealing ring, and second sealing ring is sleeved on tubular portion (22) and clamped between tubular portion (22) and the inner wall of explosion -proof hole (11).

8. The battery structural assembly of any one of claims 1-5, wherein, The end of tubular portion (22) is in circumferential sealed contact with second surface (12) after rolling.

9. The battery structural assembly of claim 8, wherein, Still include third sealing ring, and third sealing ring is clamped between the end of tubular portion (22) and second surface (12), and third sealing ring surrounds explosion -proof hole (11).

10. A battery characterized by Including shell and the battery structure assembly as claimed in any one of claims 1-9, top cover (1) is set up at the opening of shell, and top cover (1) is connected with shell and forms the shell of battery.

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