Battery cover plate and battery

Abstract

The invention relates to the technical field of batteries, in particular to a battery cover plate and a battery, the battery cover plate comprises a cover body, an anti-explosion valve and a sealing assembly, the cover body is provided with an anti-explosion channel penetrating through the cover body in the first direction, and the cover body comprises a first limiting edge and a second limiting edge which are arranged at the two ends, in the first direction, of the anti-explosion channel; the shape of the anti-explosion valve is matched with that of the anti-explosion channel, and the anti-explosion valve can be clamped between the first limiting edge and the second limiting edge. The sealing assembly is arranged around the inner wall of the anti-explosion channel by at least one circle, and the sealing assembly is pressed between the first limiting edge and the anti-explosion valve and / or between the second limiting edge and the anti-explosion valve. According to the battery cover plate and the battery provided by the invention, the sealing performance, the stability and the safety of the anti-explosion valve are prevented from being influenced by thermal stress in the process of welding the anti-explosion valve and the cover body.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cover and a battery. Background Art

[0002] In the battery field, the explosion-proof valve is an important safety device used to quickly release pressure when the internal pressure of the battery rises abnormally to prevent explosion. However, today's explosion-proof valves are usually fixed to the battery cover by welding, which makes it very easy for the explosion-proof valve cover to be thermally deformed due to the thermal stress generated by welding during the welding process of the explosion-proof valve and the battery cover. This thermal deformation will not only affect 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 a battery cover and a battery, so as to solve to a certain extent the technical problem that the current explosion-proof valve is usually fixed to the battery cover by welding in the prior art. As a result, during the welding process of the explosion-proof valve and the battery cover, the explosion-proof valve cover is very likely to be thermally deformed due to the thermal stress generated by welding. Such thermal deformation will not only affect the sealing performance of the explosion-proof valve, but may also affect the stability and safety of its overall structure.

[0004] According to a first aspect of the present application, a battery cover is provided, comprising a cover body, an explosion-proof valve and a sealing assembly, wherein the cover body is provided with an explosion-proof channel penetrating the cover body along a first direction, the cover body comprises a first limiting edge and a second limiting edge provided at both ends of the explosion-proof channel in the first direction, the explosion-proof valve is adapted to the shape of the explosion-proof channel, and the explosion-proof valve can be clamped between the first limiting edge and the second limiting edge;

[0005] The sealing component is arranged around the inner wall of the explosion-proof passage for at least one circle, and the sealing component is pressed between the first limiting edge and the explosion-proof valve and / or between the second limiting edge and the explosion-proof valve.

[0006] Preferably, the first limit is along a dimension T in the first direction. 1 Meet 0.5mm≤T 1 ≤(H 1 -0.5)mm;

[0007] The dimension T of the second limit along the first direction 2 Meet 0.5mm≤T 2 ≤(H 1 -0.5)mm;

[0008] Among them, H 1is the dimension of the cover body in the first direction.

[0009] Preferably, in a state where the battery cover plate is assembled to the battery, the first limiting edge is disposed inside the battery;

[0010] The explosion-proof channel extends from the inner side wall of the cover body to the inside of the battery in the first direction by a first predetermined height, and the first predetermined height is h 1 ;

[0011] The first predetermined height satisfies 0 mm < h 1 ≤ 4 mm.

[0012] Preferably, the explosion-proof channel extends from the outer side wall of the cover body to the outside of the battery in the first direction by a second predetermined height, and the second predetermined height is h 2 ;

[0013] The second predetermined height satisfies 0 mm < h 2 ≤ H 2 , where H 2 is the protruding height of the one with the highest protruding height among the multiple devices provided on the cover body of the battery cover plate from the outer side wall of the cover body to the outside of the battery in the first direction.

[0014] Preferably, the first limiting edge protrudes from the inner wall of the explosion-proof channel to the middle of the explosion-proof channel by a first predetermined distance S in a direction perpendicular to the first direction 1 satisfies 0.8 mm ≤ S 1 ≤ 6 mm.

[0015] Preferably, the second limiting edge protrudes from the inner wall of the explosion-proof channel to the middle of the explosion-proof channel by a second predetermined distance S in a direction perpendicular to the first direction 2 satisfies 0.8 mm ≤ S 2 ≤ 6 mm.

[0016] Preferably, the sealing assembly includes a first gasket, the first gasket is disposed around the inner wall of the explosion-proof channel for at least one week, and the first gasket is press-fitted between the first limiting edge and the explosion-proof valve.

[0017] Preferably, the sealing assembly further includes a second gasket, the second gasket is disposed around the inner wall of the explosion-proof channel for at least one week, and the second gasket is press-fitted between the second limiting edge and the explosion-proof valve.

[0018] Preferably, in a state where the sealing assembly is disposed in the explosion-proof channel, the compression rate of the sealing assembly in the first direction is 15% - 45%.

[0019] According to a second aspect of the present application, a battery is provided, including the battery cover plate described in any of the above technical solutions. Therefore, it has all the beneficial technical effects of this battery cover plate, and will not be elaborated here.

[0020] Compared with the prior art, the beneficial effects of the present application are as follows:

[0021] For the battery cover plate provided by the present application, by providing a first limiting edge and a second limiting edge at both ends of the explosion-proof channel penetrating the cover body in the first direction, an explosion-proof valve adapted to the shape of the explosion-proof channel can be clamped between the first limiting edge and the second limiting edge, and a sealing component is arranged at least one week around the inner wall of the explosion-proof channel and pressed between the first limiting edge and the explosion-proof valve and / or between the second limiting edge and the explosion-proof valve to realize the sealing between the explosion-proof valve and the cover body. Furthermore, it replaces the connection between the explosion-proof valve and the cover body by welding in the current battery cover plate, effectively avoiding the influence of the explosion-proof valve due to thermal stress on the sealing performance, stability and safety of the explosion-proof valve during the welding process of the explosion-proof valve and the cover body.

[0022] To make the above objects, features and advantages of the present application more obvious and understandable, the following specific preferred embodiments are given and described in detail in conjunction with the accompanying drawings as follows. Description of the Drawings

[0023] 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 following drawings 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.

[0024] Figure 1 It is a front view structural schematic diagram of the battery cover plate provided by the embodiment of the present application;

[0025] Figure 2 For Figure 1 It is a sectional structural schematic diagram of the provided battery cover plate obtained by cutting along the A-A direction;

[0026] Figure 3 For Figure 2 It is an enlarged structural schematic diagram of the provided battery cover plate at B;

[0027] Figure 4 For Figure 3 It is an enlarged structural schematic diagram of the provided battery cover plate at C;

[0028] Figure 5 It is an axonometric structural schematic diagram of the battery cover plate provided by the embodiment of the present application;

[0029] Figure 6 For Figure 5 the enlarged structural schematic diagram of the battery cover plate provided at D.

[0030] Reference numerals:

[0031] 1 - cover body; 10 - explosion-proof channel; 11 - first limiting edge; 111 - limiting protrusion; 12 - second limiting edge; 21 - first washer; 22 - second washer; 3 - explosion-proof valve; 4 - pole column; 5 - liquid injection hole; 6 - insulating member.

[0032] F1 - first direction; F2 - second direction; F3 - third direction. Detailed implementation manners

[0033] Next, the technical solutions of the present application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments.

[0034] Generally, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.

[0035] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0036] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0038] Next, refer to Figures 1 to 6Describe a battery cover plate and a battery according to some embodiments of the present application.

[0039] Refer to Figures 1 to 6 As shown, an embodiment of the first aspect of the present application provides a battery cover plate, which includes a cover body 1, an explosion-proof valve 3 and a sealing assembly. The cover body 1 is provided with an explosion-proof channel 10 penetrating the cover body 1 along a first direction F1. The cover body 1 includes a first limiting edge 11 and a second limiting edge 12 disposed at both ends of the explosion-proof channel 10 in the first direction F1. The explosion-proof valve 3 is adapted to the shape of the explosion-proof channel 10, and the explosion-proof valve 3 can be clamped between the first limiting edge 11 and the second limiting edge 12. The sealing assembly is disposed around the inner wall of the explosion-proof channel 10 for at least one week, and the sealing assembly is press-fitted between the first limiting edge 11 and the explosion-proof valve 3 and / or between the second limiting edge 12 and the explosion-proof valve 3.

[0040] For the battery cover plate provided according to the above technical features, by providing the first limiting edge 11 and the second limiting edge 12 at both ends of the explosion-proof channel 10 penetrating the cover body 1 in the first direction F1, the explosion-proof valve 3 adapted to the shape of the explosion-proof channel 10 can be clamped between the first limiting edge 11 and the second limiting edge 12, and the sealing between the explosion-proof valve 3 and the cover body 1 is realized by the sealing assembly disposed around the inner wall of the explosion-proof channel 10 for at least one week and press-fitted between the first limiting edge 11 and the explosion-proof valve 3 and / or between the second limiting edge 12 and the explosion-proof valve 3. Furthermore, it replaces the connection between the explosion-proof valve 3 and the cover body 1 by welding in the current battery cover plate, effectively avoiding the influence of the explosion-proof valve 3 due to thermal stress on the sealing performance, stability and safety of the explosion-proof valve 3 during the welding process of the explosion-proof valve 3 and the cover body 1.

[0041] As Figures 1 to 6 shown, F1 shown in the figure can be an example of the above-mentioned first direction F1. For the convenience of description, 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.

[0042] Preferably, as Figures 2 to 6 shown, the above-mentioned first limiting edge 11, second limiting edge 12 and cover body 1 are integrally connected to ensure the limiting stability of the explosion-proof valve 3 by the first limiting edge 11 and the second limiting edge 12.

[0043] As Figures 1 to 6 shown, the figure shows an example in which the first limiting edge 11 is disposed inside the battery in the state where the battery cover plate is assembled to the battery.

[0044] Preferably, as Figure 4As shown, the above-mentioned explosion-proof channel 10 can extend from the inner side wall of the cover body 1 along the first direction F1 to a first predetermined height inside the battery, and the first predetermined height is h 1 , so as to increase the accommodation space of the above-mentioned explosion-proof channel 10, and thus facilitate the assembly of the explosion-proof valve 3.

[0045] Preferably, as Figures 2 to 4 shown, the above-mentioned first predetermined height can satisfy 0mm < h 1 ≤0.4mm. In this way, by controlling h 1 within 0.4mm, the occupation of the internal space of the battery by the battery cover plate can be controlled, and thus the volumetric energy density inside the battery can be improved.

[0046] Preferably, as Figures 2 to 4 and Table 1 shown, the first limiting edge 11 can protrude from the inner wall of the explosion-proof channel 10 along a direction perpendicular to the first direction F1 to the middle of the explosion-proof channel 10 by a first predetermined distance S 1 , where the first predetermined distance can satisfy 0.8mm ≤ S 1 ≤6mm. On the one hand, by controlling the first predetermined distance by which the first limiting edge 11 protrudes relative to the inner wall of the explosion-proof channel 10 to exceed 0.8mm, the supporting stability of the first limiting edge 11 for the explosion-proof valve 3 can be effectively ensured, and the explosion-proof valve 3 can be effectively blocked from falling into the battery interior through the explosion-proof channel 10 during the assembly process; on the other hand, by controlling the first predetermined distance by which the first limiting edge 11 protrudes relative to the inner wall of the explosion-proof channel 10 within 6mm, the shielding of the explosion-proof channel 10 by the first limiting edge 11 can be effectively reduced, ensuring the rapidity of the exhaust of the explosion-proof channel 10 and the safety of the battery.

[0047] Preferably, as Figures 2 to 4 and Table 1 shown, the dimension T 1 of the above-mentioned first limiting edge 11 in the first direction F1 satisfies 0.5mm ≤ T 1 ≤(H 1 -0.5)mm, where H 1 is the dimension of the cover body 1 in the first direction. In this way, on the one hand, setting the dimension of the first limiting edge 11 in the first direction F1 to exceed 0.5mm can effectively ensure the supporting strength of the first limiting edge 11, preventing the first limiting edge 11 from deforming under the action of air pressure during the use of the battery, resulting in air leakage of the battery; controlling the dimension of the first limiting edge 11 in the first direction F1 within (H 1 -0.5)mm, so that the explosion-proof channel 10 has sufficient space to accommodate the explosion-proof valve 3, ensuring that the explosion-proof valve 3 can be smoothly installed between the first limiting edge 11 and the second limiting edge 12.

[0048] Similarly, as Figures 2 to 4As shown in Table 1, the above-mentioned explosion-proof channel 10 extends from the outer sidewall of the cover body 1 to the outside of the battery along the first direction F1 by a second predetermined height, and this second predetermined height is h 2 . Similarly, this second predetermined height also satisfies 0.5mm ≤ h 2 ≤ H 2 , where this H 2 is the protruding height of the device with the highest protruding height among the multiple devices provided on the cover body 1 of the battery cover plate along the first direction F1 from the outer sidewall of the cover body 1 to the outside of the battery. In this way, it is not only convenient for the processing of the battery cover plate, but also effectively reduces the influence of the layout of the explosion-proof valve 3 on the module layout, and improves the volume energy density of the battery and the battery pack.

[0049] Taking Figure 1 and Figure 2 the shown battery cover plate as an example, the devices provided on the cover body 1 of the battery cover plate can be understood as structures such as the pole column 4 and the liquid injection hole 5 provided on the cover body 1. Taking Figure 2 the example of the shown battery cover plate as an example, the above-mentioned H 2 can be the dimension of the part where the pole column 4 protrudes from the outer sidewall of the cover body 1 along the first direction F1 to the outside of the battery.

[0050] Preferably, as Figure 4 shown in Table 1, the second limiting edge 12 protrudes from the inner wall of the explosion-proof channel 10 to the middle of the explosion-proof channel 10 by a second predetermined distance S along the direction perpendicular to the first direction F1 2 , where this second predetermined distance satisfies 0.8mm ≤ S 2 ≤ 6mm. On the one hand, controlling the second predetermined distance by which the second limiting edge 12 protrudes relative to the inner wall of the explosion-proof channel 10 to exceed 0.8mm can effectively ensure the limiting stability of the second limiting edge 12 to the explosion-proof valve 3, so as to avoid the phenomenon that the explosion-proof valve 3 flies out or detaches from the cover body 1 under the action of the air pressure inside the battery; on the other hand, controlling the second predetermined distance by which the second limiting edge 12 protrudes relative to the inner wall of the explosion-proof channel 10 within 6mm is convenient for the explosion-proof valve 3 to be installed between the first limiting edge 11 and the second limiting edge 12, and can effectively reduce the shielding of the explosion-proof channel 10 by the second limiting edge 12, ensuring the rapid exhaust of the explosion-proof channel 10 and the safety of the battery.

[0051] Similarly, as Figures 2 to 4 shown in Table 1, the dimension T of the above-mentioned second limiting edge 12 in the first direction F1 2 satisfies 0.5mm ≤ T 2 ≤ (H 1 - 0.5)mm. The beneficial effects of the value range of T 2 are similar to the beneficial effects of the value range of the above-mentioned T 1 , and will not be elaborated here.

[0052] Table 1 below shows the results of the battery airtightness test and the explosion-proof valve 3 burst detection test on batteries of the same specification with battery cover plates of different sizes, as follows:

[0053] Table 1:

[0054]

[0055]

[0056]

[0057] In the embodiment, preferably, as Figures 2 to 4 shown, the above-mentioned sealing assembly may include a first gasket 21, which is arranged around the inner wall of the explosion-proof channel 10 for at least one week, and the first gasket 21 is press-fitted between the first limiting edge 11 and the explosion-proof valve 3. In this way, on the one hand, by press-fitting the first gasket 21 between the first limiting edge 11 and the explosion-proof valve 3, the gap between the explosion-proof valve 3 and the inner wall of the explosion-proof channel 10 can be blocked by the first gasket 21, ensuring the sealing performance between the explosion-proof valve 3 and the cover body 1; on the other hand, the first gasket 21 can effectively form a buffer between the explosion-proof valve 3 and the first limiting edge 11, avoiding collision between the explosion-proof valve 3 and the first limiting edge 11.

[0058] Optionally, a limiting protrusion 111 is provided on one side edge of the first limiting edge 11 away from the inner wall of the explosion-proof channel 10, and the first gasket 21 is restricted between the inner wall of the explosion-proof channel 10 and the limiting protrusion 111 to prevent the first gasket 21 from falling into the battery interior, effectively ensuring the installation stability of the first gasket 21.

[0059] Furthermore, as Figures 2 to 4 shown, the above-mentioned sealing assembly may further include a second gasket 22, which is arranged around the inner wall of the explosion-proof channel 10 for at least one week, and the second gasket 22 is press-fitted between the second limiting edge 12 and the explosion-proof valve 3. In this way, on the one hand, by press-fitting the second gasket 22 between the second limiting edge 12 and the explosion-proof valve 3, the gap between the explosion-proof valve 3 and the inner wall of the explosion-proof channel 10 can be further blocked by the second gasket 22, further ensuring the sealing performance between the explosion-proof valve 3 and the cover body 1; on the other hand, the second gasket 22 can effectively form a buffer between the explosion-proof valve 3 and the second limiting edge 12, avoiding collision between the explosion-proof valve 3 and the second limiting edge 12.

[0060] Preferably, as shown in Table 2, in the state where the sealing assembly is arranged in the explosion-proof channel 10, the compression rate δ of the sealing assembly in the first direction F1 may be 15% - 45% to ensure the sealing effectiveness of the sealing assembly.

[0061] Table 2 shows the results of the airtightness test of the sealing assembly installed in the battery at different compression ratios, as follows:

[0062] Table 2:

[0063]

[0064] Specifically, where l is the dimension of the above-mentioned sealing assembly in the first direction F1 in the natural elongation state, and l' is the dimension of the above-mentioned sealing assembly in the first direction F1 in the state of being press-fitted into the explosion-proof channel 10. In other words, as Figure 4 shown, where h 3 is the distance between the first limiting edge 11 and the second limiting edge 12 in the first direction F1, and h 4 is the dimension of the part of the explosion-proof valve 3 clamped between the first limiting edge 11 and the second limiting edge 12 in the first direction F1.

[0065] As Figures 2 to 4 shown, taking the example where the sealing assembly shown in the figure includes the first gasket 21 and the second gasket 22, the above-mentioned l is the sum of the dimension of the first gasket 21 in the first direction F1 in the natural elongation state and the dimension of the second gasket 22 in the first direction F1 in the natural elongation state.

[0066] However, it is not limited thereto. The form of the above-mentioned sealing assembly is not limited to Figures 2 to 4 the example where the sealing assembly shown includes the first gasket 21 and the second gasket 22. As long as the airtightness of the explosion-proof valve 3 can be ensured, the above-mentioned sealing assembly can also be in other forms. For example, the sealing assembly can include only the first gasket 21, or the sealing assembly can include only the second gasket 22, etc.

[0067] The embodiment of the second aspect of the present application also provides a battery, including the battery cover plate described in any of the above embodiments. Therefore, it has all the beneficial technical effects of this battery cover plate, which will not be elaborated here.

[0068] Preferably, not shown in the figure, the above-mentioned battery may further include a housing and a pole group. The above-mentioned battery cover plate can be covered on the housing in the first direction F1 to form a closed space for accommodating the pole group.

[0069] Preferably, as Figure 1 and Figure 5 shown, the above-mentioned battery may further include a pole post 4 provided on the above-mentioned battery cover plate.

[0070] The number of the pole posts 4 is two. Among them, one of the two pole posts 4 can be a positive electrode, and the other can be a negative electrode. Preferably, as Figure 1 andFigure 5 As shown, the two terminal posts 4 can be respectively arranged at both ends of the above-mentioned cover body 1 in the second direction F2 to reduce the interference between the positive electrode and the negative electrode.

[0071] Preferably, as Figure 1 and Figure 5 shown, the above-mentioned explosion-proof channel 10 can be arranged between both the positive electrode and the negative electrode.

[0072] Preferably, as Figure 1 and Figure 5 shown, the above-mentioned battery can further include a liquid injection hole 5 arranged on the battery cover plate to facilitate battery liquid injection.

[0073] Preferably, as Figure 5 and Figure 6 shown, the above-mentioned battery can further include an insulating member 6, and the insulating member 6 is attached to one side of the cover body 1 facing the electrode group to achieve insulation between the cover body 1 and the electrode group.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended 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 cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cover, characterized in that: The invention comprises a cover body, an explosion-proof valve and a sealing assembly, wherein the cover body is provided with an explosion-proof passage penetrating the cover body along a first direction, the cover body comprises a first limiting edge and a second limiting edge provided at two ends of the explosion-proof passage in the first direction, the explosion-proof valve is adapted to the shape of the explosion-proof passage, and the explosion-proof valve can be clamped between the first limiting edge and the second limiting edge; The sealing component is arranged around the inner wall of the explosion-proof passage for at least one circle, and the sealing component is pressed between the first limiting edge and the explosion-proof valve and / or between the second limiting edge and the explosion-proof valve.

2. The battery cover according to claim 1, characterized in that: The dimension T1 of the first limit edge in the first direction satisfies 0.5 mm ≤ T1 ≤ (H1-0.5) mm; The dimension T2 of the second limit edge in the first direction satisfies 0.5 mm ≤ T2 ≤ (H1-0.5) mm; Wherein, H1 is the dimension of the cover body in the first direction.

3. The battery cover according to claim 1, characterized in that: When the battery cover is assembled on the battery, the first limit edge is arranged on the inner side of the battery; The explosion-proof passage extends from the inner side wall of the cover body along the first direction toward the inside of the battery to a first predetermined height, wherein the first predetermined height is h1; The first predetermined height satisfies 0mm<h1≤4mm.

4. The battery cover according to claim 3, characterized in that: The explosion-proof passage extends from the outer side wall of the cover body along the first direction to the outside of the battery to a second predetermined height, wherein the second predetermined height is h2; The second predetermined height satisfies 0mm<h2≤H2, wherein H2 is the protruding height of one of the multiple devices of the battery cover plate arranged on the cover body, which protrudes the highest from the outer wall of the cover body toward the outside of the battery along the first direction.

5. The battery cover according to claim 1, characterized in that: The first limit edge protrudes from the inner wall of the explosion-proof passage along a direction perpendicular to the first direction toward the middle of the explosion-proof passage by a first predetermined distance S1 that satisfies 0.8 mm≤S1≤6 mm.

6. The battery cover according to claim 1, characterized in that: The second limit edge protrudes from the inner wall of the explosion-proof passage along a direction perpendicular to the first direction toward the middle of the explosion-proof passage by a second predetermined distance S2 that satisfies 0.8 mm≤S2≤6 mm.

7. The battery cover according to any one of claims 2 to 6, characterized in that: The sealing assembly comprises a first gasket, which is arranged around the inner wall of the explosion-proof passage for at least one circle, and is press-fitted between the first limiting edge and the explosion-proof valve.

8. The battery cover according to claim 7, characterized in that: The sealing assembly further comprises a second gasket, which is arranged around the inner wall of the explosion-proof passage for at least one circle, and is press-fitted between the second limiting edge and the explosion-proof valve.

9. The battery cover according to claim 1, characterized in that: When the sealing component is disposed in the explosion-proof passage, the compression rate of the sealing component in the first direction is 15% to 45%.

10. A battery, characterized in that: A battery cover comprising the battery cover according to any one of claims 1 to 9.

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