Explosion-proof valve assembly structure and battery monomer
Patent Information
- Application Number
- CN202522457162.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-19
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-11-19
AI Technical Summary
[0004]有鉴于此，本申请提供了一种防爆阀装配结构及电池单体，以解决现有技术中防爆阀在装配阶段因焊接方式发生热变形的问题
[0015]本申请提供的防爆阀装配结构，包括安装基体、防爆阀以及密封圈；安装基体包括基体本体和设置在基体本体上的凸环，凸环相对于基体本体沿第一方向凸出，第一方向为安装基体的厚度方向，基体本体开设有防爆孔，且防爆孔的内壁上设有限位台阶，限位台阶朝向凸环所在侧设置，安装基体为电池单体的壳体或盖板；防爆阀位于防爆孔中且压在限位台阶上；密封圈包括位于防爆阀周向的第一环部，在第一方向上，第一环部的局部凸出于防爆阀，该部分为下压部；其中，凸环呈向防爆阀弯折的弯折状，且凸环将下压部压在防爆阀上，以使密封圈密封在防爆阀和安装基体之间。如此设置，在防爆阀未装配时，安装基体上的凸环处于未弯折状，先后将密封圈和防爆阀放入防爆孔中，防爆阀压在限位台阶上，然后将凸环沿径向向内弯折，弯折状的凸环将密封圈的下压部压在防爆阀上，不仅实现将防爆阀固定在安装基体上，而且实现了密封圈密封在防爆阀和安装基体之间；限位台阶与凸环的配合，构成对防爆阀的硬支撑，同时，还起到约束密封圈涨料的作用；通过采用上述的装配方式，整个过程中不需要焊接，因而防爆阀不存在受热的情况，不易产生拉伸变形，防爆阀的形态保持完好，刻痕不会减薄，开阀压力稳定、可靠，解决了现有技术中防爆阀在装配阶段因焊接方式发生热变形的问题。
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Figure CN224908347U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, specifically to an explosion-proof valve assembly structure and a battery cell. Background Technology
[0002] In the structure of a battery cell, the cover and the casing form an outer shell assembly that protects the electrode assembly. Typically, the explosion-proof valve, which plays a role in ensuring battery safety, can be located on the cover or the casing.
[0003] In the related technologies of explosion-proof valve assembly, the instantaneous high temperature during welding of the explosion-proof valve to the cover plate or shell can cause thermal deformation of the explosion-proof valve, resulting in a thinning of the groove thickness. This can range from affecting the opening pressure of the explosion-proof valve to causing it to crack directly. Therefore, how to install explosion-proof valves to avoid thermal deformation during the assembly stage is a technical problem that needs to be solved by those skilled in the art. Utility Model Content
[0004] In view of this, this application provides an explosion-proof valve assembly structure and a battery cell to solve the problem of thermal deformation of the explosion-proof valve during the assembly stage due to the welding method in the prior art.
[0005] To achieve the above objectives, this application provides the following technical solution: An explosion-proof valve assembly structure includes: The mounting base includes a base body and a protruding ring disposed on the base body. The protruding ring protrudes relative to the base body along a first direction, which is the thickness direction of the mounting base. The base body has an explosion-proof hole, and the inner wall of the explosion-proof hole is provided with a limiting step. The limiting step is disposed towards the side where the protruding ring is located. The mounting base is the housing or cover of a battery cell. An explosion-proof valve is located in the explosion-proof hole and presses against the limiting step; The sealing ring includes a first ring portion located circumferentially to the explosion-proof valve, wherein a portion of the first ring portion protrudes from the explosion-proof valve in the first direction, and this portion is a pressing portion. The convex ring is bent towards the explosion-proof valve, and the convex ring presses the lower part onto the explosion-proof valve so that the sealing ring seals between the explosion-proof valve and the mounting base.
[0006] Optionally, the explosion-proof valve has a valve step on the edge facing the convex ring, the pressing part is pressed onto the valve step, and the convex ring is pressed onto the explosion-proof valve.
[0007] Optionally, the sealing ring further includes a second ring portion connected to the first ring portion, wherein the second ring portion and the pressing portion are located on both sides of the explosion-proof valve; The base body is provided with a sealing groove surrounding the circumference of the explosion-proof hole, the sealing groove being recessed relative to the limiting step and accommodating the second ring portion.
[0008] Optionally, in its natural state, the thickness of the second ring portion in the first direction is 'a'. In the first direction, the depth of the sealing groove relative to the limiting step is b, 0.15≤(ab) / a≤0.5.
[0009] Optionally, in its natural state, the thickness of the first ring portion in the direction perpendicular to the first direction is c; In the first direction, the depth of the valve step relative to the end face of the explosion-proof valve is d, 0.15≤(cd) / c≤0.5.
[0010] Optionally, on a plane perpendicular to the first direction, the orthographic projection of the convex ring partially overlaps with the orthographic projection of the limiting step.
[0011] Optionally, on a plane perpendicular to the first direction, the distance between the inner edge of the orthographic projection of the convex ring and the inner edge of the orthographic projection of the limiting step is e, where 0.5mm≤e≤2mm.
[0012] Optionally, the span of the convex ring in the second direction is L, where the second direction is the length direction of the mounting base, and the span of the convex ring in the third direction is W, where the third direction is the width direction of the mounting base, wherein: W=L; or, 1 < W / L ≤ 3; or, 1 < L / W ≤ 3.
[0013] Optionally, the explosion-proof valve includes a valve body and an assembly portion connected to the circumference of the valve body, the convex ring is pressed onto the assembly portion on a plane perpendicular to the first direction, and the orthogonal projection of the limiting step on the explosion-proof valve is located within the assembly portion.
[0014] A battery cell comprising the explosion-proof valve assembly structure described in any of the above.
[0015] The explosion-proof valve assembly structure provided in this application includes a mounting base, an explosion-proof valve, and a sealing ring. The mounting base includes a base body and a protruding ring disposed on the base body. The protruding ring protrudes relative to the base body along a first direction, which is the thickness direction of the mounting base. The base body has an explosion-proof hole, and a limiting step is provided on the inner wall of the explosion-proof hole. The limiting step is disposed towards the side where the protruding ring is located. The mounting base is the shell or cover of a battery cell. The explosion-proof valve is located in the explosion-proof hole and presses against the limiting step. The sealing ring includes a first ring portion located circumferentially to the explosion-proof valve. In the first direction, a portion of the first ring portion protrudes from the explosion-proof valve, and this portion is a pressing portion. The protruding ring is bent towards the explosion-proof valve, and the protruding ring presses the pressing portion onto the explosion-proof valve, so that the sealing ring seals between the explosion-proof valve and the mounting base. With this configuration, when the explosion-proof valve is not assembled, the convex ring on the mounting base is in an unbent state. The sealing ring and the explosion-proof valve are then placed into the explosion-proof hole, with the valve pressing against the limiting step. The convex ring is then bent radially inward, pressing the lower part of the sealing ring onto the explosion-proof valve. This not only fixes the explosion-proof valve to the mounting base but also seals the sealing ring between the valve and the base. The cooperation between the limiting step and the convex ring provides rigid support for the explosion-proof valve and also restrains the expansion of the sealing ring. By adopting this assembly method, welding is not required throughout the process, thus the explosion-proof valve is not subjected to heat, is less prone to tensile deformation, maintains its shape, and the scoring does not thin. The opening pressure is stable and reliable, solving the problem of thermal deformation of explosion-proof valves during the assembly stage caused by welding in existing technologies. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0017] Figure 1 This is a front view of the explosion-proof valve assembly structure formed by assembling the explosion-proof valve onto the cover plate, as provided in the embodiments of this application.
[0018] Figure 2 for Figure 1 Sectional view at point AA.
[0019] Figure 3 for Figure 2 Detailed view of point B in the middle.
[0020] Figure 4 for Figure 2 Dimensioning diagram at point B in the middle.
[0021] Figure 5 for Figure 2 A schematic diagram of the structure at point B before the convex ring is bent.
[0022] Figure 6 This is an isometric view of the explosion-proof valve assembly structure formed by assembling the explosion-proof valve onto the cover plate, as provided in the embodiments of this application.
[0023] Figure 7 An exploded view of the explosion-proof valve assembly structure formed by assembling the explosion-proof valve onto the cover plate, as provided in the embodiments of this application.
[0024] Figure 8 This is a structural diagram of the explosion-proof valve provided in an embodiment of this application.
[0025] Figure 9 This is a structural diagram of the sealing ring provided in an embodiment of this application.
[0026] exist Figures 1-9 middle: 100. Mounting base; 200. Explosion-proof valve; 300. Sealing ring; 110. Base body; 120. Projected ring; 1101. Explosion-proof hole; 1102. Limiting step; 1103. Sealing groove; 210. Valve body; 220. Assembly part; 2101, Valve step; 310. First ring section; 320. Second ring section; 3101. Lowering section. Detailed Implementation
[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0028] like Figures 1-9As shown, this application embodiment provides an explosion-proof valve assembly structure, including a mounting base 100, an explosion-proof valve 200, and a sealing ring 300. The mounting base 100 is the housing or cover of a battery cell, that is, the explosion-proof valve 200 is assembled on the housing or cover. The mounting base 100 includes a base body 110 and a protruding ring 120 disposed on the base body 110. The protruding ring 120 protrudes relative to the base body 110 along a first direction, which is the thickness direction of the mounting base 100. The base body 110 has an explosion-proof hole 1101, and the inner wall of the explosion-proof hole 1101 is provided with a limiting step 1102. The limiting step 1102 is disposed towards the side where the protruding ring 120 is located. In other words, the explosion-proof hole 1101 is... The device includes a stepped hole with a large hole section and a small hole section, and a convex ring 120 surrounds the circumference of the large hole section; the explosion-proof valve 200 is located in the explosion-proof hole 1101 and presses on the limiting step 1102; the sealing ring 300 includes a first ring portion 310 located circumferentially on the explosion-proof valve 200, and in a first direction, a portion of the first ring portion 310 protrudes from the explosion-proof valve 200, which is the pressing portion 3101; wherein, the convex ring 120 is bent radially inward, and the convex ring 120 is bent toward the explosion-proof valve 200, and the convex ring 120 presses the pressing portion 3101 onto the explosion-proof valve 200, that is, the first ring portion 310 is bent due to the pressing of the convex ring 120, so that the sealing ring 300 seals between the explosion-proof valve 200 and the mounting base 100.
[0029] With this configuration, when the explosion-proof valve 200 is not assembled, the convex ring 120 on the mounting base 100 is in an unbent state. The sealing ring 300 and the explosion-proof valve 200 are then placed into the explosion-proof hole 1101, with the explosion-proof valve 200 pressing against the limiting step 1102. Then, the convex ring 120 is bent radially inward. The bent convex ring 120 presses the lower pressing portion 3101 of the sealing ring 300 onto the explosion-proof valve 200. This not only fixes the explosion-proof valve 200 to the mounting base 100 but also seals the sealing ring 300 against the explosion-proof valve 200. Between the mounting base 100 and the limiting step 1102, the cooperation between the limiting step 1102 and the convex ring 120 forms a rigid support for the explosion-proof valve 200, and at the same time, it also serves to restrain the expansion of the sealing ring 300. By adopting the above assembly method, no welding is required in the entire process. Therefore, the explosion-proof valve 200 is not subject to heat and is not prone to tensile deformation. The shape of the explosion-proof valve 200 remains intact, the grooves do not thin, and the valve opening pressure is stable and reliable. This solves the problem of thermal deformation of the explosion-proof valve 200 during the assembly stage due to welding in the prior art.
[0030] Figure 1 , Figure 2 , Figure 6 and Figure 7 The example shows an explosion-proof valve 200 mounted on a cover plate.
[0031] In some other specific embodiments, the explosion-proof valve 200 includes a valve body 210 and an assembly portion 220 integrally connected to the circumference of the valve body 210. A convex ring 120 is pressed onto the assembly portion 220 on a plane perpendicular to the first direction. The orthogonal projection of the limiting step 1102 on the explosion-proof valve 200 is located within the assembly portion 220. The valve body 210 is used to open in the event of thermal runaway.
[0032] With this configuration, the thickness of the assembly part 220 is greater than the thickness of the valve body 210, which facilitates the assembly and fixation of the explosion-proof valve 200 through the assembly part 220. The limiting step 1102 only makes pressure contact with the assembly part 220 and will not affect the valve body 210.
[0033] In some preferred embodiments, the edge of the explosion-proof valve 200 facing the convex ring 120 is provided with a valve step 2101, that is, the edge of the assembly part 220 is provided with a valve step 2101, the pressing part 3101 is pressed onto the valve step 2101, and the convex ring 120 is pressed onto the explosion-proof valve 200. A portion of the upper surface of the explosion-proof valve 200 is pressed by the sealing ring 300, and the portion of the explosion-proof valve 200 pressed by the sealing ring 300 is provided with a step, and another portion of the upper surface of the explosion-proof valve 200 is pressed by the convex ring 120.
[0034] With this configuration, the recessed space of the valve step 2101 can accommodate the pressing part 3101 of the sealing ring 300 squeezed by the convex ring 120. This is beneficial for the convex ring 120 to press the pressing part 3101 of the sealing ring 300 while also pressing it tightly onto the surface of the explosion-proof valve 200, increasing the force-bearing area of the explosion-proof valve 200 and helping to prevent adverse stress. In addition, the sealing ring 300 is hidden inside and not exposed, protecting the sealing ring 300 and improving the sealing effect.
[0035] Of course, in addition to the above methods, it is also feasible for the convex ring 120 to be pressed only onto the pressing part 3101 of the sealing ring 300.
[0036] In some other preferred embodiments, the sealing ring 300 further includes a second ring 320 connected to the first ring 310. The second ring 320 seals the side of the explosion-proof valve 200 away from the convex ring 120, that is, the second ring 320 and the pressing part 3101 are located on the inner and outer sides of the explosion-proof valve 200, respectively. The base body 110 is provided with a sealing groove 1103 surrounding the explosion-proof hole 1101. The sealing groove 1103 is recessed relative to the limiting step 1102 and accommodates the second ring 320. Figure 3 From the perspective of the middle, that is, the second ring 320 is in a squeezed and sealed contact with the lower surface edge of the explosion-proof valve 200 and the base body 110 of the shell or cover plate.
[0037] With this configuration, the recessed space of the sealing groove 1103 can accommodate the second ring portion 320 of the sealing ring 300 squeezed by the explosion-proof valve 200. In this way, the sealing ring 300 surrounds and is distributed around the upper surface edge, side surface and lower surface edge of the explosion-proof valve 200 to form a seal, achieving a double sealing effect. At the same time, it will not affect the rigid support of the limiting step 1102 on the explosion-proof valve 200, resulting in a good and stable sealing effect.
[0038] In some specific embodiments, in its natural state, the second ring portion 320 of the sealing ring 300 has a thickness of a in the first direction, that is, a is the initial thickness of the second ring portion 320 of the sealing ring 300; in the first direction, the sinking depth of the sealing groove 1103 relative to the limiting step 1102 is b, that is, b is the thickness of the second ring portion 320 of the sealing ring 300 after being compressed in the assembled state, 0.15≤(ab) / a≤0.5, where (ab) / a is the compression amount of the second ring portion 320.
[0039] With this setting, after testing and verification, it was found that when (ab) / a is less than 0.15, the airtightness test of the assembly of the explosion-proof valve 200 fails; when (ab) / a is greater than 0.5, the airtightness test of the assembly of the explosion-proof valve 200 fails, the sealing ring 300 has poor aging resistance and is prone to collapse; when (ab) / a meets the above range, the sealing performance of the assembly of the explosion-proof valve 200 is good, and the sealing ring 300 has good aging resistance.
[0040] In some other specific embodiments, in its natural state, the first ring portion 310 of the sealing ring 300 has a thickness of c in the direction perpendicular to the first direction, that is, c is the ring width of the first ring portion 310 of the sealing ring 300 in the inner and outer directions; in the first direction, the sinking depth of the valve step 2101 relative to the end face of the explosion-proof valve 200 is d, that is, d is the thickness of the pressing portion 3101 of the first ring portion 310 of the sealing ring 300 after being compressed in the assembled state, 0.15≤(cd) / c≤0.5, and (cd) / c is the compression amount of the pressing portion 3101.
[0041] With this setting, after testing and verification, it was found that when (cd) / c is less than 0.15, the airtightness test at the assembly point of the explosion-proof valve 200 fails; when (cd) / c is greater than 0.5, the airtightness test at the assembly point of the explosion-proof valve 200 fails, the sealing ring 300 has poor aging resistance and is prone to collapse; when (cd) / c meets the above range, the sealing performance at the assembly point of the explosion-proof valve 200 is good, and the sealing ring 300 has good aging resistance.
[0042] In some other preferred embodiments, the orthographic projection of the convex ring 120 partially overlaps with the orthographic projection of the limiting step 1102 on a plane perpendicular to the first direction. That is, the inner edge of the convex ring 120 falls on the limiting step 1102, and the inner edge of the convex ring 120 does not extend beyond the limiting step 1102.
[0043] With this configuration, the convex ring 120 and the limiting step 1102 overlap, thus ensuring a rigid fixation of the explosion-proof valve 200. Under the single-cell battery process and operating conditions, this can prevent the explosion-proof valve 200 from breathing or rebounding due to internal air pressure fluctuations.
[0044] To ensure reliable sealing, before bending and pressing the convex ring 120, the explosion-proof valve 200 and the sealing ring 300 can be pressed into the explosion-proof hole 1101 using assembly tools for pre-tightening. The bending of the convex ring 120 is then performed when the second ring 320 of the sealing ring 300 is squeezed and sealed in place, and the limiting step 1102 is tightly pressed against the explosion-proof valve 200. This is beneficial to the sealing reliability of the assembly.
[0045] In some other preferred embodiments, the distance between the inner edge of the orthographic projection of the convex ring 120 and the inner edge of the orthographic projection of the limiting step 1102 on a plane perpendicular to the first direction is e, where 0.5mm≤e≤2mm.
[0046] After testing and verification, it was found that when e is less than 0.5mm, it cannot provide sufficient clamping space for the pressure head of the assembly tooling to extend into the convex ring 120, and pre-clamping cannot be completed; when e is greater than 2mm, it encroaches on the clamping space of the convex ring 120 on the explosion-proof valve 200, which will reduce the clamping reliability of the convex ring 120 and the base body 110 on the explosion-proof valve 200; when e meets the above range, it can provide sufficient clamping space for the pressure head of the assembly tooling, and at the same time, the convex ring 120 has sufficient coverage area on the explosion-proof valve 200, which can ensure the clamping reliability of the convex ring 120 and the base body 110 on the explosion-proof valve 200.
[0047] It should be noted that since both the convex ring 120 and the limiting step 1102 are annular, the distinction between the inner and outer sides is undoubtedly the inner and outer sides in the radial direction.
[0048] In this application, the shape of the convex ring 120 is adapted to the shape of the explosion-proof hole 1101, and may be, but is not limited to, circular, elliptical, or waist-shaped.
[0049] In some specific embodiments, the span of the convex ring 120 in the second direction is L, where the second direction is the length direction of the mounting base 100, or the outer diameter of the convex ring 120 in the second direction is L. The span of the convex ring 120 in the third direction is W, where the third direction is the width direction of the mounting base 100, or the outer diameter of the convex ring 120 in the third direction is W, where: W=L; or, 1<W / L≤3; or, 1<L / W≤3.
[0050] With this setup, after testing and verification, it was found that when W and L satisfy the above relationship, the convex ring 120 is easy to bend and form, especially when W=L, that is, when the convex ring 120 is circular, it is the easiest to form; if W and L do not satisfy the above relationship, forming is difficult.
[0051] For ease of understanding, Figures 1-5 The diagram shows the first direction, the second direction, and the third direction.
[0052] Based on the aforementioned explosion-proof valve assembly structure, this application embodiment also provides a battery cell, which includes an electrode assembly, a housing, a cover plate, and an explosion-proof valve. The electrode assembly is located within the housing, the cover plate is connected to the opening of the housing, and the explosion-proof valve is disposed on the cover plate or the housing. That is, the cover plate and the explosion-proof valve 200 form the aforementioned explosion-proof valve assembly structure, or the housing and the explosion-proof valve 200 form the aforementioned explosion-proof valve assembly structure. Since this battery cell has the aforementioned explosion-proof valve assembly structure, the beneficial effects brought by the explosion-proof valve assembly structure to the battery cell are described above and will not be repeated here.
[0053] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.
[0054] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.
[0055] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.
[0056] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.
[0057] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.
Claims
1. An explosion-proof valve assembly structure, characterized in that, include: The mounting base includes a base body and a protruding ring disposed on the base body. The protruding ring protrudes relative to the base body along a first direction, which is the thickness direction of the mounting base. The base body has an explosion-proof hole, and the inner wall of the explosion-proof hole is provided with a limiting step. The limiting step is disposed towards the side where the protruding ring is located. The mounting base is the housing or cover of a battery cell. An explosion-proof valve is located in the explosion-proof hole and presses against the limiting step; The sealing ring includes a first ring portion located circumferentially to the explosion-proof valve, wherein a portion of the first ring portion protrudes from the explosion-proof valve in the first direction, and this portion is a pressing portion. The convex ring is bent towards the explosion-proof valve, and the convex ring presses the lower part onto the explosion-proof valve so that the sealing ring seals between the explosion-proof valve and the mounting base.
2. The explosion-proof valve assembly structure according to claim 1, characterized in that, The explosion-proof valve has a valve step on the edge facing the convex ring, the pressing part is pressed onto the valve step, and the convex ring is pressed onto the explosion-proof valve.
3. The explosion-proof valve assembly structure according to claim 1, characterized in that, The sealing ring also includes a second ring portion connected to the first ring portion, and the second ring portion and the pressing portion are located on both sides of the explosion-proof valve, respectively; The base body is provided with a sealing groove surrounding the circumference of the explosion-proof hole, the sealing groove being recessed relative to the limiting step and accommodating the second ring portion.
4. The explosion-proof valve assembly structure according to claim 3, characterized in that, In its natural state, the thickness of the second ring portion in the first direction is a; In the first direction, the depth of the sealing groove relative to the limiting step is b, 0.15≤(ab) / a≤0.
5.
5. The explosion-proof valve assembly structure according to claim 2, characterized in that, In its natural state, the thickness of the first ring portion of the sealing ring in the direction perpendicular to the first direction is c; In the first direction, the depth of the valve step relative to the end face of the explosion-proof valve is d, 0.15≤(cd) / c≤0.
5.
6. The explosion-proof valve assembly structure according to claim 1, characterized in that, On a plane perpendicular to the first direction, the orthographic projection of the convex ring partially overlaps with the orthographic projection of the limiting step.
7. The explosion-proof valve assembly structure according to claim 6, characterized in that, On a plane perpendicular to the first direction, the distance between the inner edge of the orthographic projection of the convex ring and the inner edge of the orthographic projection of the limiting step is e, where 0.5mm≤e≤2mm.
8. The explosion-proof valve assembly structure according to claim 1, characterized in that, The span of the convex ring in the second direction is L, where the second direction is the length direction of the mounting base. The span of the convex ring in the third direction is W, where the third direction is the width direction of the mounting base. W=L; or, 1 < W / L ≤ 3; or, 1 < L / W ≤ 3.
9. The explosion-proof valve assembly structure according to claim 1, characterized in that, The explosion-proof valve includes a valve body and an assembly part connected to the circumference of the valve body. The convex ring is pressed onto the assembly part on a plane perpendicular to the first direction. The orthogonal projection of the limiting step on the explosion-proof valve is located within the assembly part.
10. A single battery cell, characterized in that, Includes the explosion-proof valve assembly structure as described in any one of claims 1-9.