Explosion-proof structure and battery

Abstract

The invention relates to the technical field of batteries, in particular to an explosion-proof structure and a battery, the explosion-proof structure comprises a pressure ring, a sealing ring part and a mounting seat integrally connected with a shell, and the mounting seat is provided with an explosion-proof hole penetrating through the mounting seat along a first direction. A bearing edge is arranged at the first end, in the first direction, of the placement base, and the bearing edge is arranged on the inner side of the hole wall of the anti-explosion hole and used for bearing the anti-explosion valve. The pressing ring can be fixedly arranged at the second end, in the first direction, of the placement base so that the anti-explosion valve can be limited between the pressing ring and the bearing edge. And the sealing ring part is pressed between the pressing ring and the anti-explosion valve and / or pressed between the anti-explosion valve and the bearing edge. According to the explosion-proof structure and the battery provided by the invention, the explosion-proof valve is limited between the bearing edge and the pressing ring, so that the explosion-proof valve and the battery shell are fixed, and the air tightness of the explosion-proof valve is ensured. And the existing mode of connecting the explosion-proof valve and the battery shell through a welding means is effectively replaced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly to an explosion-proof structure and a battery. Background Art

[0002] In the field of batteries, an explosion-proof valve is an important safety device for quickly relieving pressure when the internal pressure of the battery rises abnormally to prevent explosion. However, currently, the explosion-proof valve is usually fixed to the battery cover plate by welding. During the welding process of the explosion-proof valve and the battery cover plate, the explosion-proof valve cover plate is extremely prone to thermal deformation due to the thermal stress generated by welding, resulting in thermal deformation of the explosion-proof valve or the battery cover plate. This thermal deformation not only affects the sealing performance of the explosion-proof valve but also may affect the stability and safety of its overall structure. Summary of the Invention

[0003] The purpose of the present application is to provide an explosion-proof structure and a battery to solve, to a certain extent, the technical problem existing in the prior art that currently the explosion-proof valve is usually fixed to the battery cover plate by welding. During the welding process of the explosion-proof valve and the battery cover plate, the explosion-proof valve cover plate is extremely prone to thermal deformation due to the thermal stress generated by welding, resulting in thermal deformation of the explosion-proof valve or the battery cover plate. This thermal deformation not only affects the sealing performance of the explosion-proof valve but also may affect the stability and safety of its overall structure.

[0004] According to a first aspect of the present application, an explosion-proof structure is provided for fixing an explosion-proof valve to a housing of a battery. The explosion-proof structure includes a pressure ring, a sealing ring portion, and a mounting seat integrally connected to the housing. The mounting seat is provided with an explosion-proof hole penetrating through the mounting seat in a first direction.

[0005] A supporting edge is provided at a first end of the mounting seat in the first direction. The supporting edge is provided on the inner side of the hole wall of the explosion-proof hole for supporting the explosion-proof valve.

[0006] The pressure ring can be fixedly arranged at a second end of the mounting seat in the first direction to limit the explosion-proof valve between the pressure ring and the supporting edge.

[0007] The sealing ring portion is press-fitted between the pressure ring and the explosion-proof valve and / or press-fitted between the explosion-proof valve and the supporting edge.

[0008] Preferably, the mounting side wall of the housing where the mounting seat is located has an outer wall and an inner wall opposite to each other in the first direction.

[0009] The pressure ring is arranged at an end of the mounting seat close to the outer wall.

[0010] Preferably, the mounting seat protrudes from the inner wall towards the inside of the housing by a first predetermined height h in the first direction. 1, where 0 mm < h 1 ≤ 4 mm;

[0011] and / or, the placement seat protrudes from the outer wall in the first direction by a second predetermined height h towards the outer surface of the housing 2 , where 0 mm < h 2 ≤ H, where H is the protrusion height of the highest one among other devices provided on the placement side wall that protrudes from the outer wall in the first direction towards the outside of the housing.

[0012] Preferably, the dimension T of the supporting edge in the first direction 1 satisfies: 0.5 mm ≤ T 1 ≤ 0.8K, where K is the dimension of the placement side wall in the first direction;

[0013] and / or, the minimum dimension T of the pressure ring in the first direction 2 satisfies: 0.8 mm ≤ T 2 ≤ 3 mm.

[0014] Preferably, in the direction perpendicular to the inner wall surface of the explosion-proof hole;

[0015] the dimension S of the supporting edge 1 satisfies: 0.8 mm ≤ S 1 ≤ 6 mm;

[0016] and / or, the dimension S of the pressure ring 2 satisfies: 0.8 mm ≤ S 2 ≤ 6 mm.

[0017] Preferably, in the first direction, the difference ΔL between the distance from the end face of the placement seat away from the supporting edge to the outer wall and the distance from the side face of the pressure ring facing away from the supporting edge to the outer wall satisfies: -0.3 mm ≤ ΔL ≤ 0.3 mm.

[0018] Preferably, the sealing ring part includes:

[0019] a first washer, press-fitted between the supporting edge and the explosion-proof valve;

[0020] and / or, a second washer, press-fitted between the pressure ring and the explosion-proof valve.

[0021] Preferably, in the state where the sealing ring part is arranged in the explosion-proof hole, the compression ratio of the sealing ring part in the first direction is 15% - 45%.

[0022] According to a second aspect of the present application, a battery is provided, including the above-mentioned housing and the explosion-proof structure described in any of the above technical solutions. Therefore, it has all the beneficial technical effects of this explosion-proof structure, and will not be elaborated here.

[0023] Preferably, the housing includes a housing body and a cover plate. The cover plate covers one end of the housing in the first direction, and the mounting seat is arranged on the cover plate.

[0024] Compared with the prior art, the beneficial effects of the present application are as follows:

[0025] For the explosion-proof structure provided by the present application, on the one hand, through the split assembly structure of the mounting seat and the pressure ring, it is extremely convenient to install the explosion-proof valve between the supporting edge and the pressure ring, and the explosion-proof valve is restricted between the supporting edge and the pressure ring through the fixed connection (such as welding, bonding, etc.) between the pressure ring and the mounting seat to realize the fixation of the explosion-proof valve and the battery housing; on the other hand, through the sealing ring part pressed between the explosion-proof valve and the supporting edge and / or between the explosion-proof valve and the pressure ring, the sealing between the explosion-proof valve and the mounting seat is realized, ensuring the airtightness of the explosion-proof valve. In this way, a new way of connecting the explosion-proof valve and the battery housing can be provided through the explosion-proof structure of the present application, which can effectively replace the existing method of connecting the explosion-proof valve and the battery housing by welding means, and effectively avoid the phenomenon that the explosion-proof valve is deformed due to thermal stress during the welding process, affecting the use effect of the explosion-proof valve.

[0026] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0028] Figure 1 Explosion structure schematic diagram of the explosion-proof structure provided by the embodiment of the present application;

[0029] Figure 2 Front view structure schematic diagram of the explosion-proof structure provided by the embodiment of the present application;

[0030] Figure 3 For Figure 2 Section structure schematic diagram obtained by cutting the provided explosion-proof structure along A-A;

[0031] Figure 4 For Figure 3Schematic diagram of the enlarged structure of the provided explosion-proof structure at B;

[0032] Figure 5 For Figure 4 Schematic diagram of the enlarged structure of the provided explosion-proof structure at C;

[0033] Figure 6 For Figure 2 Schematic diagram of the sectional structure of another example obtained by cutting the provided explosion-proof structure along A-A;

[0034] Figure 7 For Figure 6 Schematic diagram of the enlarged structure of the provided explosion-proof structure at D;

[0035] Figure 8 For Figure 7 Schematic diagram of the enlarged structure of the provided explosion-proof structure at E.

[0036] Reference numerals:

[0037] 1 - Cover plate; 10 - Explosion-proof hole; 11 - Mounting seat; 12 - Supporting edge; 121 - Supporting part; 122 - Limiting flange; 21 - First washer; 22 - Second washer; 3 - Explosion-proof valve; 4 - Pressure ring; 41 - Pressing part; 42 - Reinforcing edge; 5 - Liquid injection hole; 6 - Terminal post.

[0038] F1 - First direction; F2 - Second direction; F3 - Third direction. Detailed implementation manners

[0039] The following detailed implementation manners are provided to help the reader obtain a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example and is not limited to the order set forth herein. Rather, changes that will be apparent after understanding the disclosure of the present application can be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

[0040] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0041] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on", "connected to", "coupled to", "above", or "covering" another element, it can be directly "on", "connected to", "coupled to", "above", or "covering" the other element, or there can be one or more other elements intervening therebetween. In contrast, when an element is described as being "directly on", "directly connected to", "directly coupled to", "directly above", or "directly covering" another element, there can be no other elements intervening therebetween.

[0042] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0043] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or parts, these components, elements, regions, layers, or parts are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or part from another. Thus, the first component, element, region, layer, or part described in the examples herein may also be referred to as the second component, element, region, layer, or part without departing from the teachings of the examples.

[0044] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the figures. Such spatial relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations of "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relationship terms used herein will be interpreted accordingly.

[0045] The terms used herein are for the purpose of describing various examples only and are not intended to limit the disclosure. Unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises," "comprising," and "having" enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the existence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0046] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Accordingly, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

[0047] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of this application. Additionally, although the examples described herein have a variety of configurations, other configurations are possible, as will be apparent after understanding the disclosure of this application.

[0048] Reference is made below Figures 1 to 8 to describe an explosion-proof structure and a battery according to some embodiments of the present application.

[0049] Referring to Figures 1 to 8 as shown, an embodiment of the first aspect of the present application provides an explosion-proof structure for fixing an explosion-proof valve 3 to a housing of a battery. The explosion-proof structure includes a compression ring 4, a sealing ring portion, and a mounting seat 11 integrally connected to the housing. The mounting seat 11 is provided with an explosion-proof hole 10 penetrating through the mounting seat 11 in a first direction F1. A supporting edge 12 is provided at a first end of the mounting seat 11 in the first direction F1. The supporting edge 12 is provided on the inner side of the hole wall of the explosion-proof hole 10 for supporting the explosion-proof valve 3. The compression ring 4 can be fixedly arranged at a second end of the mounting seat 11 in the first direction F1 to limit the explosion-proof valve 3 between the compression ring 4 and the supporting edge 12. The sealing ring portion is press-fitted between the compression ring 4 and the explosion-proof valve 3 and / or between the explosion-proof valve 3 and the supporting edge 12.

[0050] According to the explosion-proof structure provided by the above technical features, on the one hand, through the split assembly structure of the placement seat 11 and the pressing ring 4, it is extremely convenient to install the explosion-proof valve 3 between the supporting edge 12 and the pressing ring 4. And the explosion-proof valve 3 is restricted between the supporting edge 12 and the pressing ring 4 through the fixed connection (such as welding, bonding, etc.) between the pressing ring 4 and the placement seat 11 to achieve the fixation of the explosion-proof valve 3 to the battery housing. On the other hand, through the sealing ring part pressed between the explosion-proof valve 3 and the supporting edge 12 and / or between the explosion-proof valve 3 and the pressing ring 4, the sealing between the explosion-proof valve 3 and the placement seat 11 is realized, ensuring the airtightness of the explosion-proof valve 3. In this way, a new way of connecting the explosion-proof valve 3 to the battery housing can be provided by the explosion-proof structure of the present application, which can effectively replace the existing method of connecting the explosion-proof valve 3 to the battery housing by welding means, and effectively avoid the phenomenon that the explosion-proof valve 3 is deformed due to thermal stress during the welding process, affecting the use effect of the explosion-proof valve 3.

[0051] As Figures 1 to 8 shown, F1 shown in the figure can be an example of the above-mentioned first direction F1. For the convenience of description, the two mutually perpendicular directions on the plane perpendicular to the first direction F1 are respectively defined as the second direction F2 and the third direction F3. F2 shown in the figure can be an example of the above-mentioned second direction F2, and F3 shown in the figure can be an example of the above-mentioned third direction F3. Taking the above explosion-proof structure provided in a square shell battery as an example, the above-mentioned first direction F1 can be the length direction of the square shell battery, the above-mentioned second direction F2 can be the width direction of the square shell battery, and the above-mentioned third direction F3 can be the thickness direction of the square shell battery. However, it is not limited to this. The above explosion-proof structure is not limited to being provided in a square shell battery and can also be provided in a cylindrical battery or other special-shaped batteries.

[0052] Preferably, not shown in the figure, the housing of the above battery may include a cover plate 1 and a housing body. The cover plate 1 can be covered on the housing body along the first direction F1. As Figures 1 to 8 shown, the figure shows an example in which the above-mentioned placement seat 11 is provided on the cover plate 1. Correspondingly, the placement side wall for setting the above-mentioned placement seat 11 is the cover plate 1.

[0053] However, it is not limited to this. As long as the processing dimensions of the above explosion-proof structure and the supporting strength of the explosion-proof valve 3 can be satisfied, the above-mentioned placement seat 11 can also be provided on the housing body. Correspondingly, the placement side wall for setting the above-mentioned placement seat 11 is the side wall of the housing body where the placement seat 11 is located.

[0054] See Figures 1 to 8 , the following will take the example of the above-mentioned placement seat 11 being provided on the cover plate 1 to describe the explosion-proof structure provided by the present application in detail.

[0055] As Figures 3 to 8As shown, the above-mentioned cover plate 1 may have an outer wall and an inner wall that face each other in the first direction F1. In other words, the inner wall is the wall surface facing one side of the housing body when the cover plate 1 is covering the housing body. Correspondingly, the outer wall is the wall surface on the side of the cover plate 1 facing away from the housing body.

[0056] Preferably, as Figures 1 to 8 shown, the above-mentioned pressure ring 4 is arranged at one end of the outer wall of the mounting seat 11 close to the outer wall. In other words, relative to the supporting edge 12, the pressure ring 4 is arranged outside the cover plate 1. In this way, it is convenient for the assembly of the explosion-proof valve 3. Even after the cover plate 1 and the housing body are assembled, it still does not prevent the assembly of the explosion-proof valve 3.

[0057] Preferably, as Figure 5 and Figure 8 shown, the mounting seat 11 protrudes into the interior of the housing by a first predetermined height h along the first direction F1 relative to the inner wall 1 , so as to ensure that there is enough space in the mounting seat 11 to accommodate the explosion-proof valve 3 and the sealing ring part.

[0058] Preferably, the first predetermined height h 1 can satisfy 0 mm < h 1 ≤ 4 mm. In this way, while ensuring the expansion of the space of the explosion-proof hole 10 in the mounting seat 11, it effectively ensures that the mounting seat 11 does not prevent the layout of the internal structure of the battery, and effectively ensures the space utilization rate of the battery.

[0059] Preferably, as Figure 5 , Figure 8 and Table 1 below show that the dimension T of the supporting edge 12 in the first direction F1 1 can satisfy 0.5 mm ≤ T 1 ≤ 0.8K, where K is the dimension of the cover plate 1 in the first direction F1. In this way, on the one hand, setting the value of T 1 to exceed 0.5 mm can effectively ensure the supporting strength of the supporting edge 12, so as to effectively avoid deformation of the supporting edge 12 resulting in battery air leakage or electrolyte leakage and other phenomena in the case of extrusion of the sealing ring part and / or in the case where the explosion-proof valve 3 bears the internal and external air pressure of the battery to extrude the supporting edge 12; on the other hand, controlling the value of T 1 within 0.8K can effectively ensure that there is enough space in the first direction F1 for the explosion-proof hole 10 to accommodate the explosion-proof valve 3, and ensure the volumetric energy density of the battery.

[0060] Preferably, as Figure 5 , Figure 8 and Table 1 below show that in the direction perpendicular to the inner wall surface of the explosion-proof hole 10, the dimension S of the above-mentioned supporting edge 12 1 can satisfy: 0.8 mm ≤ S 1 ≤ 6 mm. In this way, on the one hand, setting S1 When the value setting exceeds 0.8 mm, it can effectively ensure the supporting stability of the supporting edge 12 for the 12 explosion-proof valves 3, and effectively avoid the phenomenon that the contact area between the supporting edge 12 and the explosion-proof valve 3 is small, and once the explosion-proof valve 3 tilts slightly, the explosion-proof valve 3 is likely to fall into the interior of the housing; on the other hand, controlling the S 1 value within 6 mm can effectively avoid the excessive shielding of the explosion-proof holes 10 by the supporting edge 12, resulting in the inability of the explosion-proof valve 3 to open within the designed bursting pressure range.

[0061] Optionally, the above-mentioned supporting edge 12 may include a supporting portion 121 and a limiting flange 122 that are connected to each other. The supporting portion 121 is integrally connected to the inner wall of the explosion-proof hole 10 of the placement seat. A limiting flange 122 is provided on one side edge of the supporting portion 121 away from the inner wall of the explosion-proof hole 10. The following first gasket 21 is restricted between the inner wall of the explosion-proof hole 10 and the limiting flange 122 to prevent the first gasket 21 from falling into the battery interior, effectively ensuring the setting stability of the first gasket 21.

[0062] Preferably, as Figure 1 and Figures 3 to 8 shown, the above-mentioned cover plate 1, placement seat 11 and supporting edge 12 are integrally connected to improve the supporting stability of the explosion-proof valve 3.

[0063] Furthermore, as Figure 5 and Figure 8 shown, the relative outer wall of the above-mentioned placement seat 11 protrudes from the outer surface of the housing by a second predetermined height h 2 in the first direction F1, so as to further expand the accommodation space in the explosion-proof hole 10 of the placement seat 11 and ensure the setting safety and stability of the explosion-proof valve 3.

[0064] Preferably, the second predetermined height h 2 can satisfy 0 mm < h 2 ≤ H, where H is the protruding height of the highest one among the relative outer walls of other devices provided on the cover plate 1 protruding from the outer part of the housing in the first direction F1. In this way, it is not only convenient for the processing of the explosion-proof structure, but also effectively reduces the influence of the layout of the explosion-proof structure on the module layout, and improves the volume energy density of the battery and the battery pack.

[0065] Taking Figure 1 and Figure 2 the cover plate 1 shown as an example, the devices provided on the cover plate 1 can be understood as structures such as the pole 6 and the liquid injection hole 5 provided on the cover plate 1. Taking Figure 2 the example of the battery cover plate 1 shown as an example, the above-mentioned H can be the dimension of the part where the outer side wall of the pole 6 relative to the cover plate 1 protrudes from the battery in the first direction F1.

[0066] Preferably, as Figure 5 shown,Figure 8 As shown in Table 1 below, the minimum dimension T of the above-mentioned pressure ring 4 in the first direction F1 2 can satisfy: 0.8 mm ≤ T 2 ≤ 3 mm. Thus, on the one hand, setting the T 2 value to exceed 0.8 mm can effectively ensure the anti-deformation strength of the pressure ring 4, so as to effectively avoid phenomena such as battery air leakage or electrolyte leakage caused by the deformation of the pressure ring 4 in the case of extrusion of the sealing ring part and / or in the case of the explosion-proof valve 3 impacting and extruding the pressure ring 4; on the other hand, controlling the T 2 value within 3 mm can effectively ensure that the pressure ring 4 can adapt to the thickness of the cover plate 1 and be smoothly installed in the placement seat 11.

[0067] Optionally, as Figures 3 to 5 shown, the above-mentioned pressure ring 4 may include a pressing piece part 41 and a reinforcing edge 42 that are integrally connected to each other. The outer side wall of the pressing piece part 41 is welded to the inner wall of the above-mentioned explosion-proof hole 10 to realize the connection between the pressure ring 4 and the placement seat 11. The reinforcing edge 42 may be provided on the side where the inner side wall of the pressing piece part 41 is located, so that the cross-section of the pressure ring 4 is in the shape of to further improve the bending strength of the pressure ring 4.

[0068] Preferably, as Figure 5 、 Figure 8 and Table 1 below show, in the direction perpendicular to the inner wall surface of the explosion-proof hole 10, the dimension S of the above-mentioned pressure ring 4 2 can satisfy: 0.8 mm ≤ S 2 ≤ 6 mm. The beneficial effects of the S 2 value within this range are similar to the beneficial effects of the above-mentioned S 1 value within this range, and will not be elaborated here.

[0069] Table 1 below shows the results of the battery airtightness test and the explosion-proof valve 3 bursting detection test on batteries of the same specification according to different sizes of battery cover plates 1 as follows:

[0070] Table 1:

[0071]

[0072]

[0073] Preferably, as Figure 5 、 Figure 8As shown in Table 2, in the first direction F1, the difference ΔL between the distance from the end face of the mounting seat 11 away from the supporting edge 12 to the outer wall and the distance from the side face of the pressure ring 4 facing away from the supporting edge 12 to the outer wall satisfies: -0.3 mm ≤ ΔL ≤ 0.3 mm. In this way, the connection area between the pressure ring 4 and the mounting seat 11 is ensured, thereby improving the connection stability between the pressure ring 4 and the mounting seat 11.

[0074] It should be noted that taking the Figure 5 and Figure 8 shown orientation as an example, the ΔL value can be understood as the distance by which the top surface of the mounting seat 11 and the top surface of the pressure ring 4 are offset from each other in the first direction F1.

[0075] Table 2 shows the assembly data obtained by welding the pressure ring 4 and the mounting seat 11 of the same specification with different ΔL values:

[0076] Table 2:

[0077]

[0078] In the embodiment, preferably, as Figure 1 、 Figures 3 to 8 shown, the above-mentioned sealing ring part may include a first washer 21, which is arranged around the inner wall of the explosion-proof hole 10 for at least one week, and the first washer 21 is press-fitted between the supporting edge 12 and the explosion-proof valve 3. In this way, on the one hand, by press-fitting the first washer 21 between the supporting edge 12 and the explosion-proof valve 3, the gap between the explosion-proof valve 3 and the inner wall of the explosion-proof hole 10 can be blocked by the first washer 21, ensuring the sealing performance between the explosion-proof valve 3 and the cover body; on the other hand, the first washer 21 can effectively form a buffer between the explosion-proof valve 3 and the supporting edge 12, avoiding collision between the explosion-proof valve 3 and the supporting edge 12.

[0079] Furthermore, as Figures 3 to 8 shown, the above-mentioned sealing ring part may further include a second washer 22, which is arranged around the inner wall of the explosion-proof hole 10 for at least one week, and the second washer 22 is press-fitted between the pressure ring 4 and the explosion-proof valve 3. In this way, on the one hand, by press-fitting the second washer 22 between the pressure ring 4 and the explosion-proof valve 3, the gap between the explosion-proof valve 3 and the inner wall of the explosion-proof hole 10 can be further blocked by the second washer 22, further ensuring the sealing performance between the explosion-proof valve 3 and the mounting seat 11; on the other hand, the second washer 22 can effectively form a buffer between the explosion-proof valve 3 and the pressure ring 4, avoiding collision between the explosion-proof valve 3 and the pressure ring 4.

[0080] Preferably, as shown in Table 3, when the sealing ring part is arranged in the explosion-proof hole 10, the compression rate δ of the sealing ring part in the first direction F1 can be 15% - 45% to ensure the sealing effectiveness of the sealing ring part.

[0081] Table 3 shows the results of the airtightness test of the battery with the sealing ring part installed at different compression ratios, as follows:

[0082] Table 3:

[0083]

[0084]

[0085] Specifically, where l is the dimension of the above-mentioned sealing ring part in the first direction F1 in the natural elongation state, and l' is the dimension of the above-mentioned sealing ring part in the first direction F1 when it is press-fitted into the explosion-proof hole 10. In other words, as Figure 4 shown, where h 3 is the distance between the support edge 12 and the pressure ring 4 in the first direction F1, and h 4 is the dimension of the part of the explosion-proof valve 3 clamped between the support edge 12 and the pressure ring 4 in the first direction F1.

[0086] As Figure 1 , Figures 3 to 8 shown, taking the example where the sealing ring part shown in the figure includes the first washer 21 and the second washer 22, the above-mentioned l is the sum of the dimension of the first washer 21 in the first direction F1 in the natural elongation state and the dimension of the second washer 22 in the first direction F1 in the natural elongation state.

[0087] However, it is not limited to this. The form of the above-mentioned sealing ring part is not limited to Figures 1 to 8 the example where the sealing ring part shown includes the first washer 21 and the second washer 22. As long as the airtightness of the explosion-proof valve 3 can be guaranteed, the above-mentioned sealing ring part can also be in other forms. For example, the sealing ring part can only include the first washer 21, or the sealing ring part can only include the second washer 22, etc.

[0088] The embodiment of the second aspect of the present application also provides a battery, including the above-mentioned housing and the explosion-proof structure described in any of the above embodiments. Therefore, it has all the beneficial technical effects of this explosion-proof structure and will not be elaborated here.

[0089] Preferably, not shown in the figure, the housing may include a housing body and a cover plate 1, and the cover plate 1 covers one end of the housing in the first direction F1.

[0090] Preferably, as Figures 1 to 8 shown, the above-mentioned mounting seat 11 can be arranged on the cover plate 1 to realize the arrangement of the explosion-proof valve 3 on the cover plate 1.

[0091] Optionally, not shown in the figure, the above-mentioned mounting seat 11 can also be arranged on the above-mentioned shell body to realize arranging the explosion-proof valve 3 on the shell body.

[0092] Preferably, as Figure 1 and Figure 2 shown, the above-mentioned battery can also include a pole post 6 arranged on the above-mentioned battery cover plate 1.

[0093] The number of the pole posts 6 is two. Among them, one of the two pole posts 6 can be a positive electrode, and the other can be a negative electrode. Preferably, as Figure 1 and Figure 2 shown, the two pole posts 6 can be respectively arranged at both ends of the above-mentioned cover plate 1 in the second direction F2 to reduce the interference between the positive electrode and the negative electrode.

[0094] Preferably, as Figure 1 and Figure 2 shown, the above-mentioned mounting seat 11 can be arranged between both the positive electrode and the negative electrode.

[0095] Preferably, as Figure 1 and Figure 2 shown, the above-mentioned battery can also include a liquid injection hole 5 arranged on the above-mentioned cover plate 1 to facilitate battery liquid injection.

[0096] Preferably, as Figure 5 and Figure 6 shown, the above-mentioned battery can also include an insulating part, and the insulating part is attached to the inner wall of the cover plate 1 to realize insulation between the cover body and the pole group inside the shell body.

[0097] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An explosion-proof structure, characterized in that: Used to fix the explosion-proof valve to the housing of the battery, the explosion-proof structure includes a pressure ring, a sealing ring portion and a placement seat integrally connected to the housing, and the placement seat is provided with an explosion-proof hole penetrating the placement seat along a first direction; A supporting edge is provided at the first end of the placement seat in the first direction, and the supporting edge is provided on the inner side of the hole wall of the explosion-proof hole for supporting the explosion-proof valve; The pressure ring can be fixedly disposed on the second end of the mounting seat in the first direction to restrict the explosion-proof valve between the pressure ring and the supporting edge; The sealing ring portion is pressed between the pressure ring and the explosion-proof valve and / or between the explosion-proof valve and the supporting edge.

2. The explosion-proof structure according to claim 1, characterized in that: The housing side wall of the housing where the housing seat is located has an outer wall and an inner wall that are opposite to each other along the first direction; The pressure ring is arranged at one end of the seating seat close to the outer wall.

3. The explosion-proof structure according to claim 2, characterized in that: The seating seat protrudes relative to the inner wall along the first direction toward the inside of the housing by a first predetermined height h1, wherein 0 mm < h1 ≤ 4 mm; And / or, the mounting seat protrudes a second predetermined height h2 relative to the outer wall along the first direction toward the exterior of the shell, wherein 0mm<h2≤H, wherein H is the protruding height of the highest one of other devices arranged on the mounting side wall that protrudes toward the outside of the shell along the first direction relative to the outer wall.

4. The explosion-proof structure according to claim 2, characterized in that: The dimension T1 of the supporting edge in the first direction satisfies: 0.5 mm ≤ T1 ≤ 0.8 K, where K is the dimension of the placement side wall in the first direction; And / or, a minimum dimension T2 of the pressure ring in the first direction satisfies: 0.8 mm ≤ T2 ≤ 3 mm.

5. The explosion-proof structure according to claim 1, characterized in that: In a direction perpendicular to the inner wall surface of the explosion-proof hole; The dimension S1 of the supporting edge satisfies: 0.8mm≤S1≤6mm; And / or, the size S2 of the pressure ring satisfies: 0.8mm≤S2≤6mm.

6. The explosion-proof structure according to claim 2, characterized in that: In the first direction, a difference ΔL between a distance from an end surface of the seating seat away from the supporting edge to the outer wall and a distance from a side surface of the pressure ring facing away from the supporting edge to the outer wall satisfies: -0.3mm≤ΔL≤0.3mm.

7. The explosion-proof structure according to any one of claims 1 to 6, characterized in that: The sealing ring portion comprises: A first gasket, press-fitted between the supporting edge and the explosion-proof valve; And / or, a second gasket is press-fitted between the pressure ring and the explosion-proof valve.

8. The explosion-proof structure according to claim 7, characterized in that: When the sealing ring portion is disposed in the explosion-proof hole, a compression rate of the sealing ring portion in the first direction is 15% to 45%.

9. A battery, characterized in that: The invention comprises the shell and the explosion-proof structure according to any one of claims 1 to 8.

10. The battery according to claim 9, characterized in that The shell comprises a shell body and a cover plate, the cover plate is covered on one end of the shell in the first direction, and the placement seat is arranged on the cover plate.

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