Anti-explosion valve plate, top cover of packaging container, packaging container and battery

Abstract

The utility model discloses an anti-explosion valve plate, a top cover of a packaging container, the packaging container and a battery. The anti-explosion valve plate comprises a first part and a second part which are sequentially arranged in the first direction, the first part surrounds the second part, the thickness of the second part is smaller than that of the first part, and the second part is provided with an anti-explosion nick structure and a reinforcing rib structure; the anti-explosion nick structure comprises at least one nick groove, the first groove bottom of the nick groove is a plane, and the joint of the side wall of the nick groove and the first groove bottom is of a fillet structure. According to the anti-explosion valve plate, the strength of the anti-explosion valve plate and the strength of the valve face of the anti-explosion valve plate are enhanced by tightening the valve face of the anti-explosion valve plate, and the roots of the nick grooves are machined into the fillet structures, so that the anti-explosion valve plate is more stable in explosion value, higher in strength and not prone to damage. Therefore, the qualified rate of the top cover plate and even the battery shell applied to the downstream is improved.

Description

Technical Field

[0001] The utility model particularly relates to an explosion-proof valve sheet, a top cover of a packaging container, a packaging container and a battery, and belongs to the technical field of explosion-proof valves and power batteries. Background Art

[0002] In the current explosion-proof valve industry, the explosion value of explosion-proof valves has always been a parameter that needs to be stabilized, which is closely related to the yield of explosion-proof valves.

[0003] After the explosion-proof valve and the top cover are welded, there will be an ultrasonic cladding process to melt the lower plastic and the top cover together. During this process, the ultrasonic vibration will damage the explosion-proof valve on the top cover. In severe cases, the notch of the explosion-proof valve will be broken, causing the top cover to fail.

[0004] Existing explosion-proof valves usually have an "X"-shaped groove carved on the valve surface to increase the strength of the valve surface. However, this process only squeezes the material in all directions, which also destroys the original strength of the material, resulting in the actual valve surface strength of the explosion-proof valve not meeting the expected effect and causing the explosion-proof valve to be damaged in subsequent processes. Utility Model Content

[0005] The main purpose of the utility model is to provide an explosion-proof valve sheet, a top cover of a packaging container, a packaging container and a battery, so as to overcome the deficiencies in the prior art.

[0006] In order to achieve the above-mentioned utility model purpose, the technical solution adopted by the utility model includes:

[0007] On one hand, the utility model provides an explosion-proof valve plate, comprising a first part and a second part arranged in sequence along a first direction, the first part is arranged around the second part, the thickness of the second part is less than the thickness of the first part, and the second part is provided with an explosion-proof notch structure and a reinforcing rib structure;

[0008] The explosion-proof notched structure comprises at least one notched groove, the first groove bottom of the notched groove is a plane, and the connection between the side wall of the notched groove and the first groove bottom is a rounded structure.

[0009] On the other hand, the utility model further provides a top cover of a packaging container, comprising the explosion-proof valve sheet.

[0010] On the other hand, the utility model further provides a packaging container, comprising the explosion-proof valve sheet or the top cover of the packaging container.

[0011] On the other hand, the utility model further provides a battery, comprising the explosion-proof valve sheet or the top cover of the packaging container or the packaging container.

[0012] Compared with the prior art, the advantages of the utility model include: the explosion-proof valve plate provided by the utility model strengthens the strength of the explosion-proof valve plate and its valve surface by tightening the valve surface of the explosion-proof valve plate, and the explosion-proof valve plate provided by the utility model processes the root of the notched groove into a rounded structure, so that its bursting value is more stable, the strength is higher and it is not easy to be damaged, thereby improving the qualification rate of the top cover plate and even the battery shell of its downstream application. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic diagram of the front structure of an explosion-proof valve plate provided in a typical implementation case of the utility model;

[0015] Figure 2 yes Figure 1 A cross-sectional view formed along AA;

[0016] Figure 3 , Figure 4 yes Figure 2 Schematic diagram of the local structure at the middle structure B;

[0017] Figure 5 , Figure 6 yes Figure 2 Schematic diagram of the local structure at structure A. DETAILED DESCRIPTION

[0018] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the utility model after long-term research and extensive practice. The technical solution, its implementation process and principle will be further explained as follows.

[0019] On one hand, the utility model provides an explosion-proof valve plate, comprising a first part and a second part arranged in sequence along a first direction, the first part is arranged around the second part, the thickness of the second part is less than the thickness of the first part, and the second part is provided with an explosion-proof notch structure and a reinforcing rib structure;

[0020] The explosion-proof notched structure comprises at least one notched groove, the first groove bottom of the notched groove is a plane, and the connection between the side wall of the notched groove and the first groove bottom is a rounded structure.

[0021] Furthermore, the sidewalls of the notched groove include a first sidewall and a second sidewall that are arranged opposite to each other along the first direction, and the connections between the first sidewall, the second sidewall and the first groove bottom all have the rounded corner structure.

[0022] Furthermore, the first side wall includes a first straight line segment and a first arc segment which are sequentially arranged, and the first arc segment is smoothly connected to the first straight line segment and the first groove bottom respectively to form a first rounded structure.

[0023] Furthermore, the second side wall includes a second straight line segment and a second arc segment arranged in sequence, and the second arc segment is smoothly connected to the second straight line segment and the first groove bottom respectively to form a second rounded corner structure.

[0024] Furthermore, the curvature radius R1 of the first arc segment is 0.05 mm-0.2 mm.

[0025] Furthermore, the curvature radius R2 of the second arc segment is 0.05 mm-0.2 mm.

[0026] Furthermore, the curvature radius of the first arc segment and the second arc segment are the same or different, and preferably the curvature radius of the first arc segment and the second arc segment are set to be the same.

[0027] Furthermore, the arc lengths of the first arc segment and the second arc segment are the same or different, and preferably the arc lengths of the first arc segment and the second arc segment are set to be the same.

[0028] Furthermore, the first straight line segment and the second straight line segment extend to the notch of the notch groove, the extension lines of the first straight line segment and the second straight line segment intersect, and the angle between the first straight line segment and the second straight line segment is 40°-80°.

[0029] Furthermore, an angle formed between the first straight line segment and / or the second straight line segment and the first groove bottom is an obtuse angle.

[0030] Furthermore, the angles formed by the first straight line segment, the second straight line segment and the first groove bottom are the same or different. Preferably, the angles formed by the first straight line segment, the second straight line segment and the first groove bottom are set to be the same.

[0031] Furthermore, the lengths of the first straight line segment and the second straight line segment are the same or different, and preferably the lengths of the first straight line segment and the second straight line segment are set to be the same.

[0032] Furthermore, a width A1 of the first groove bottom along the first direction is 0-0.1 mm.

[0033] Furthermore, the notched groove is a closed annular groove or a non-closed arc groove.

[0034] Furthermore, the second part has a central area and a peripheral area sequentially arranged along the first direction, the peripheral area is arranged around the central area, and the explosion-proof notch structure and the reinforcing rib structure are both arranged in the peripheral area.

[0035] Furthermore, the notched groove is arranged around the central area.

[0036] Furthermore, the reinforcing rib structure includes at least one convex rib, and the convex rib is an arc-shaped structure protruding along the second direction.

[0037] Furthermore, the convex rib is formed by bending a portion of the second portion along the second direction.

[0038] Furthermore, the curvature radius R7 of the convex rib is 0.1 mm-2 mm.

[0039] Furthermore, the convex rib is a closed annular structure or a non-closed arc structure.

[0040] Furthermore, the convex rib is arranged around the central area.

[0041] Furthermore, the reinforcing rib structure includes a plurality of convex ribs, and the plurality of convex ribs are arranged in sequence along the first direction.

[0042] Furthermore, the plurality of convex ribs are smoothly connected in sequence.

[0043] Furthermore, in the first direction, a minimum distance A3 between the root of the convex rib and the center of the notched groove is 0.3 mm.

[0044] Furthermore, in the second direction, the ratio of the height H5 of the rib to the thickness H4 of the second portion is (1.1-2):1.

[0045] Furthermore, in the second direction, the height H5 of the convex rib is 0.2 mm-2 mm.

[0046] Further, the first part has a first surface and a second surface arranged back to back along the second direction, and the second part has a third surface and a fourth surface arranged back to back along the second direction, the third surface and the first surface are located on the same side, and the second surface and the fourth surface are located on the same side, wherein the convex rib is completely located between the first extension surface of the first surface and the second extension surface of the second surface, and the convex rib is tangent to the first extension surface and / or the second extension surface.

[0047] As a typical implementation, the second portion may be formed by thinning a partial area of ​​the explosion-proof valve sheet.

[0048] Furthermore, the third surface is located on a side of the first surface close to the second surface, and the fourth surface and the second surface are located in the same extension plane.

[0049] In a typical implementation case, the second portion is further provided with a sink groove, and the sink groove and the notch groove are arranged back to back along the second direction.

[0050] Furthermore, the notched groove is arranged on the third surface, and the sink groove is arranged on the fourth surface.

[0051] Furthermore, in the first direction, the width of the sink groove is greater than the width of the notch groove.

[0052] Furthermore, the notched groove is completely located within the orthographic projection area formed by the sink groove along the second direction.

[0053] Furthermore, the notched groove coincides with the center axis of the sink groove.

[0054] Further, the sink includes a second bottom, a third side wall, and a fourth side wall, and the third side wall and the fourth side wall are arranged opposite to each other along the first direction.

[0055] The third side wall includes a third arc segment and a fourth arc segment which are smoothly connected in sequence, the third arc segment is smoothly connected to the fourth surface, and the fourth arc segment is smoothly connected to the second groove bottom; the fourth side wall includes a fifth arc segment and a sixth arc segment which are smoothly connected in sequence, the fifth arc segment is smoothly connected to the fourth surface, and the sixth arc segment is smoothly connected to the second groove bottom.

[0056] Furthermore, the radius of curvature R3 of the third arc segment is 0.05 mm-0.3 mm, and the radius of curvature R4 of the fourth arc segment is 0.05 mm-0.3 mm.

[0057] Furthermore, the curvature radius R5 of the fifth arc segment is 0.05 mm-0.3 mm, and the curvature radius R6 of the sixth arc segment is 0.05 mm-0.3 mm.

[0058] Furthermore, the curvature radius of the third arc segment is the same as or different from that of the fifth arc segment.

[0059] Furthermore, the arc length of the third arc segment is the same as or different from the arc length of the fifth arc segment.

[0060] Furthermore, the curvature radius of the fourth arc segment is the same as or different from that of the sixth arc segment.

[0061] Furthermore, the arc lengths of the fourth arc segment and the sixth arc segment are the same or different.

[0062] Furthermore, in the first direction, the width A2 of the second groove bottom does not exceed 0.3 mm.

[0063] Furthermore, in the second direction, the depth H1 of the notch groove, the depth H2 of the sink groove and the thickness H4 of the second portion satisfy: (H1+H2):H4=(0.2-0.6):1, and the second direction intersects the first direction perpendicularly.

[0064] Further, in the second direction, a ratio of a thickness H3 of the first portion to a thickness H4 of the second portion is 1:(0.25-0.95).

[0065] Further, in the second direction, the thickness H3 of the first portion is 0.3 mm-2 mm.

[0066] Further, in the second direction, a thickness H4 of the second portion is 0.1 mm-1.2 mm.

[0067] On the other hand, the utility model further provides a top cover of a packaging container, comprising the explosion-proof valve sheet.

[0068] On the other hand, the utility model further provides a packaging container, comprising the explosion-proof valve sheet or the top cover of the packaging container.

[0069] Furthermore, the packaging container can be used as a battery shell or the like.

[0070] On the other hand, the utility model further provides a battery, comprising the explosion-proof valve sheet or the top cover of the packaging container or the packaging container.

[0071] The technical solution, its implementation process and principle will be further explained below in conjunction with the accompanying drawings. It should be noted that the utility model is intended to provide a specific explanation of the structure, mechanism and effect of the explosion-proof valve plate. The processing techniques involved are all known to those skilled in the art and are not specifically limited here.

[0072] See also Figure 1, an explosion-proof valve plate, comprising a first part 1 and a second part 2 arranged in sequence along a first direction, the first part 1 is arranged around the second part 2, the thickness of the second part 2 is less than the thickness of the first part 1, and the second part 2 is provided with an explosion-proof notch structure, a sink groove 4 and a reinforcing rib structure 5; it should be noted that the first part 1 and the second part 2 are integrated, and the second part 2 is formed by thinning the explosion-proof valve plate, and the thinning can refine the material grains, improve the material density, improve the material performance, and reduce material defects.

[0073] Specifically, in the second direction, the thickness H3 of the first portion 1 is 0.3 mm-2 mm, and the thickness H4 of the second portion 2 is 0.1 mm-1.2 mm.

[0074] Specifically, the first part 1 has a first surface 11 and a second surface 12 arranged back to back along the second direction, and the second part 2 has a third surface 21 and a fourth surface 22 arranged back to back along the second direction, the third surface 21 and the first surface 11 are located on the same side, and the second surface 12 and the fourth surface 22 are located on the same side, wherein the third surface 21 is located on the side of the first surface 11 close to the second surface 12, and the fourth surface 22 and the second surface 12 are located in the same extension plane, the explosion-proof notch structure is arranged on the third surface 21 of the second part 2, the sink groove 4 is arranged on the fourth surface 22 of the second part 2 and is arranged back to back with the explosion-proof notch structure, and the reinforcing rib structure 5 is arranged on the third surface 21 and the fourth surface 22 of the second part 2; more specifically, the first direction and the second direction are perpendicular to each other, and the second direction is the thickness direction of the explosion-proof valve plate.

[0075] Specifically, the second portion 2 has a central area and a peripheral area sequentially arranged along the first direction, the peripheral area is arranged around the central area, and the explosion-proof notch structure and the reinforcing rib structure 5 are both arranged in the peripheral area.

[0076] Specifically, the explosion-proof notched structure includes at least one notched groove 3, the first groove bottom 33 of the notched groove 3 is a plane, and the root of the notched groove 3 (i.e., the connection between the side wall of the notched groove 3 and the first groove bottom 33) is a rounded structure. Compared with the notched groove 3 with a sharp root, setting the root of the notched groove 3 as a rounded structure can avoid the problem of stress concentration at the root of the notched groove 3, thereby making the explosion value of the explosion-proof valve more stable. As a preferred solution, the notched groove 3 can be formed by a stamping process.

[0077] For details, please refer to Figure 3 and Figure 4The side walls of the notched groove 3 include a first side wall and a second side wall arranged opposite to each other along the first direction, and the connections between the first side wall, the second side wall and the first groove bottom 33 are all rounded structures. More specifically, the first side wall includes a first straight line segment 31 and a first arc segment 32 arranged in sequence, and the first arc segment 32 is smoothly connected to the first straight line segment 31 and the first groove bottom 33 respectively, and forms a first rounded structure. The second side wall includes a second straight line segment 34 and a second arc segment 35 arranged in sequence, and the second arc segment 35 is smoothly connected to the second straight line segment 34 and the first groove bottom 33 respectively, and forms a second rounded structure.

[0078] Specifically, the first straight line segment 31 and the second straight line segment 34 extend to the slot openings of the notch slot 3 respectively, the extension lines of the first straight line segment 31 and the second straight line segment 34 intersect, the angle formed by the first straight line segment 31 and / or the second straight line segment 34 and the first slot bottom 33 is an obtuse angle, the angle formed by the first straight line segment 31, the second straight line segment 34 and the first slot bottom 33 is the same or different, the length of the first straight line segment 31 and the second straight line segment 34 is the same or different, the curvature radius of the first arc segment 32 and the second arc segment 35 are the same or different, and the arc length of the first arc segment 32 and the second arc segment 35 are the same or different.

[0079] As a preferred embodiment, the first straight line segment 31, the second straight line segment 34 and the first groove bottom 33 form the same angle, the lengths of the first straight line segment 31 and the second straight line segment 34 are set to be the same, and the first arc segment 32 and the second arc segment 35 have the same curvature radius and arc length.

[0080] More specifically, the curvature radius R1 of the first arc segment 32 is 0.05mm-0.2mm, the curvature radius R2 of the second arc segment 35 is 0.05mm-0.2mm, and the angle formed by the first straight line segment 31 and the second straight line segment 34 is 40°-80°; more specifically, in the first direction, the width A1 of the first groove bottom 33 is 0-0.1mm, and in the second direction, the depth H1 of the notch groove 3, the depth H2 of the sink groove 4 and the thickness H4 of the second portion 2 satisfy: (H1+H2):H4=(0.2-0.6):1.

[0081] Specifically, the explosion-proof notch structure may include at least one notch groove group, each notch groove group includes at least one of the aforementioned notch grooves 3, and at least one notch groove 3 contained in the same notch groove group is distributed in an annular area. More specifically, multiple notch groove groups are arranged in sequence along the first direction. It can be understood that the notch groove 3 can be a closed annular groove or a non-closed arc groove. Exemplarily, when each notch groove group includes one of the aforementioned notch grooves 3, the notch groove 3 is an annular groove extending continuously along the circumference of the first part 1, that is, the notch groove 3 has a contoured structure similar to the shape of the first part 1.

[0082] Specifically, in the second direction, the sink groove 4 and the scored groove 3 are arranged back to back. It should be noted that the sink groove 4 opposite to the scored groove 3 is arranged on the fourth side 22 of the second part 2, so that the material of the second part 2 can better flow toward the two sides of the sink groove 4 / scored groove 3 along the first direction. At the same time, the thickness of the second part 2 formed after thinning minus the depth H1 of the scored groove 3 and the depth H2 of the sink groove 4 is the residual thickness of the explosion-proof valve sheet remaining between the scored groove 3 and the sink groove 4. The parameters of the residual thickness are closely related to the bursting value of the explosion-proof valve. Specifically, the smaller the residual thickness, the smaller the bursting value.

[0083] It should be noted that the sink groove 4 and the notched groove 3 may correspond one to one, that is, they all correspond. More specifically, in the first direction, the width of the sink groove 4 is greater than the width of the notched groove 3, that is, the notched groove 3 is completely located within the orthographic projection area formed by the sink groove 4 along the second direction. As a preferred solution, the notched groove 3 coincides with the central axis of the sink groove 4.

[0084] For details, please refer to Figure 3 and Figure 4 The sink 4 includes a second groove bottom 43 and a third side wall and a fourth side wall. The third side wall and the fourth side wall are arranged opposite to each other along the first direction. The third side wall includes a third arc segment 41 and a fourth arc segment 42 which are smoothly connected in sequence. The third arc segment 41 is smoothly connected to the fourth surface 22, and the fourth arc segment 42 is smoothly connected to the second groove bottom 43; the fourth side wall includes a fifth arc segment 44 and a sixth arc segment 45 which are smoothly connected in sequence. The fifth arc segment 44 is smoothly connected to the fourth surface 22, and the sixth arc segment 45 is smoothly connected to the second groove bottom 43.

[0085] Specifically, the curvature radius and arc length of the third arc segment 41 are the same as or different from those of the fifth arc segment 44, and the curvature radius and arc length of the fourth arc segment 42 are the same as or different from those of the sixth arc segment 45; as a preferred embodiment, the curvature radius and arc length of the third arc segment 41 are the same as those of the fifth arc segment 44, and the curvature radius and arc length of the fourth arc segment 42 are the same as those of the sixth arc segment 45.

[0086] Specifically, the curvature radius R3 of the third arc segment 41 is 0.05mm-0.3mm, the curvature radius R4 of the fourth arc segment 42 is 0.05mm-0.3mm, the curvature radius R5 of the fifth arc segment 44 is 0.05mm-0.3mm, and the curvature radius R6 of the sixth arc segment 45 is 0.05mm-0.3mm.

[0087] Specifically, in the first direction, the width A2 of the second groove bottom 43 does not exceed 0.3 mm, and in the second direction, the ratio of the thickness H3 of the first portion 1 to the thickness H4 of the second portion 2 is 1:(0.25-0.95).

[0088] For details, please refer to Figure 5 and Figure 6 The reinforcing rib structure 5 includes at least one convex rib, and the convex rib is an arc-shaped structure protruding along the second direction. It can be understood that the convex rib can be protruding in the direction from the third surface to the fourth surface, or can be protruding in the direction from the fourth surface to the third surface. More specifically, the convex rib can be formed by bending a part of the second part 2 along the second direction. Combined with the foregoing, after the scoring groove is formed by stamping, the material of the explosion-proof valve disc flows to both sides due to the extrusion of the mold, resulting in loosening of the material around the scoring groove and even the entire valve surface, causing large residual stress. Subsequently, the part around the scoring groove is stretched to form a protruding rib on the valve surface of the explosion-proof valve disc (mainly the third and fourth surfaces of the valve surface), so that the material of the valve surface is tightened again, thereby strengthening the overall strength of the explosion-proof valve disc and eliminating the residual stress generated by the forming of the scoring groove.

[0089] Specifically, the notched groove 3 is also arranged in the peripheral area of ​​the second part, and is also arranged around the central area. It should be noted that the convex rib can be a closed annular structure or a non-closed arc structure arranged around the central area. More specifically, the curvature radius R7 of the convex rib is 0.1mm-2mm. It should be noted that the convex rib is smoothly connected to the other parts of the second part, and the curvature radius of the connection between the convex rib and the other parts of the second part is the same as the curvature radius of the convex rib itself.

[0090] More specifically, the convex rib is completely located between the first extension surface of the first surface 11 and the second extension surface of the second surface 12, and the convex rib is tangent to the first extension surface and / or the second extension surface; by providing the convex rib structure, the impact on the notched groove in subsequent processes is smaller, which not only increases the service life of the explosion-proof valve, but also improves the qualified rate of the explosion-proof valve and the top cover used in subsequent applications. Specifically, by providing the convex rib structure, the strength of the valve surface is enhanced, the force is transmitted to other directions, and the component force perpendicular to the fourth surface is reduced, thereby enhancing the force frequency of the product.

[0091] Specifically, the reinforcing rib structure includes a plurality of convex ribs, the plurality of convex ribs are arranged in sequence along the first direction, and the plurality of convex ribs are smoothly connected in sequence; illustratively, the reinforcing rib structure includes a first convex rib 51, a second convex rib 52 and a third convex rib 53 arranged in sequence along the first direction, the convex surfaces of the first convex rib 51 and the third convex rib 53 are located on the third surface, and the convex surface of the second convex rib 52 is located on the fourth surface, and the curvature radius and arc length of the first convex rib 51, the second convex rib 52 and the third convex rib 53 may be the same or different, wherein the first convex rib 51 is the one closest to the notched groove 3 among the three, the minimum spacing A3 between the root of the first convex rib 51 and the center of the notched groove 3 is 0.3mm, the minimum value of the center spacing A4 between the first convex rib 51 and the third convex rib 53 is 0.1mm, and in the second direction, the height H5 of the first convex rib 51, the second convex rib 52 and the third convex rib 53 is 0.2mm-2mm.

[0092] The utility model provides an explosion-proof valve plate, which strengthens the strength of the explosion-proof valve plate and its valve surface by tightening the valve surface of the explosion-proof valve plate. The utility model also provides an explosion-proof valve plate, which has a more stable burst value, higher strength and is not easy to be damaged by processing the basis of the notched groove into a rounded structure, thereby improving the qualified rate of the top cover plate and even the battery shell of its downstream application.

[0093] It should be understood that the above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An explosion-proof valve plate, comprising a first part and a second part sequentially arranged along a first direction, wherein the first part is arranged around the second part, the thickness of the second part is less than the thickness of the first part, and the second part is provided with an explosion-proof notch structure and a reinforcing rib structure; Features: The explosion-proof notched structure comprises at least one notched groove, the first groove bottom of the notched groove is a plane, and the connection between the side wall of the notched groove and the first groove bottom is a rounded structure.

2. The explosion-proof valve sheet according to claim 1, characterized in that: The sidewalls of the notched groove include a first sidewall and a second sidewall that are oppositely arranged along the first direction, and the connections between the first sidewall, the second sidewall and the first groove bottom all have the rounded corner structure.

3. The explosion-proof valve sheet according to claim 2, characterized in that: The first side wall includes a first straight line segment and a first arc segment arranged in sequence, the first arc segment is smoothly connected to the first straight line segment and the first groove bottom, respectively, to form a first rounded corner structure, and the second side wall includes a second straight line segment and a second arc segment arranged in sequence, the second arc segment is smoothly connected to the second straight line segment and the first groove bottom, respectively, to form a second rounded corner structure.

4. The explosion-proof valve according to claim 3, characterized in that: The curvature radius R1 of the first arc segment is 0.05 mm-0.2 mm.

5. The explosion-proof valve disc according to claim 3, characterized in that: The curvature radius R2 of the second arc segment is 0.05 mm-0.2 mm.

6. The explosion-proof valve sheet according to claim 3, characterized in that: The curvature radii of the first arc segment and the second arc segment are the same or different.

7. The explosion-proof valve sheet according to claim 3 or 6, characterized in that: The arc lengths of the first arc segment and the second arc segment are the same or different.

8. The explosion-proof valve sheet according to claim 3, characterized in that: The first straight line segment and the second straight line segment extend to the notch of the notch groove, the extension lines of the first straight line segment and the second straight line segment intersect, and the angle formed by the first straight line segment and the second straight line segment is 40°-80°.

9. The explosion-proof valve sheet according to claim 3 or 8, characterized in that: An angle formed between the first straight line segment and / or the second straight line segment and the first groove bottom is an obtuse angle.

10. The explosion-proof valve sheet according to claim 3 or 8, characterized in that: The angles formed by the first straight line segment, the second straight line segment and the first groove bottom are the same or different.

11. The explosion-proof valve sheet according to claim 3 or 8, characterized in that: The lengths of the first straight line segment and the second straight line segment are the same or different.

12. The explosion-proof valve sheet according to claim 2, characterized in that: A width A1 of the first groove bottom along the first direction is 0-0.1 mm.

13. The explosion-proof valve disc according to claim 1 or 2, characterized in that: The notched groove is a closed annular groove or a non-closed arc groove.

14. The explosion-proof valve sheet according to claim 13, characterized in that: The second part has a central area and a peripheral area sequentially arranged along the first direction, the peripheral area is arranged around the central area, and the explosion-proof notch structure and the reinforcing rib structure are both arranged in the peripheral area.

15. The explosion-proof valve sheet according to claim 14, characterized in that: The score groove is arranged around the central area.

16. The explosion-proof valve sheet according to claim 14, characterized in that: The reinforcing rib structure includes at least one convex rib, and the convex rib is an arc-shaped structure protruding along the second direction.

17. The explosion-proof valve sheet according to claim 16, characterized in that: The convex rib is formed by bending a portion of the second portion along the second direction.

18. The explosion-proof valve disc according to claim 16, characterized in that: The curvature radius R7 of the convex rib is 0.1 mm-2 mm.

19. The explosion-proof valve disc according to claim 16, characterized in that: The convex rib is a closed annular structure or a non-closed arc structure.

20. The explosion-proof valve disc according to claim 16 or 19, characterized in that: The convex rib is arranged around the central area.

21. The explosion-proof valve disc according to claim 16 or 19, characterized in that: The reinforcing rib structure includes a plurality of convex ribs, and the plurality of convex ribs are arranged in sequence along the first direction.

22. The explosion-proof valve disc according to claim 21, characterized in that: The plurality of convex ribs are smoothly connected in sequence.

23. The explosion-proof valve sheet according to claim 16, characterized in that: In the first direction, the minimum distance A3 between the root of the rib and the center of the notched groove is 0.3 mm.

24. The explosion-proof valve disc according to claim 16, characterized in that: In the second direction, a ratio of a height H5 of the rib to a thickness H4 of the second portion is (1.1-2):

1.

25. The explosion-proof valve disc according to claim 16 or 24, characterized in that: In the second direction, the height H5 of the rib is 0.2 mm-2 mm.

26. The explosion-proof valve disc according to claim 16, characterized in that: The first part has a first surface and a second surface arranged back to back along the second direction, and the second part has a third surface and a fourth surface arranged back to back along the second direction, the third surface and the first surface are located on the same side, and the second surface and the fourth surface are located on the same side, wherein the convex rib is completely located between the first extension surface of the first surface and the second extension surface of the second surface, and the convex rib is tangent to the first extension surface and / or the second extension surface.

27. The explosion-proof valve disc according to claim 26, characterized in that: The third surface is located on a side of the first surface close to the second surface, and the fourth surface and the second surface are located in the same extension plane.

28. The explosion-proof valve disc according to claim 26, characterized in that: The second portion is further provided with a sink groove, and the sink groove and the notched groove are arranged back to back along the second direction.

29. The explosion-proof valve disc according to claim 28, characterized in that: The notched groove is arranged on the third surface, and the sunken groove is arranged on the fourth surface.

30. The explosion-proof valve sheet according to claim 28, characterized in that: In the first direction, the width of the sink groove is greater than the width of the notch groove.

31. The explosion-proof valve sheet according to claim 28, characterized in that: The notched groove is completely located within the orthographic projection area formed by the sink along the second direction.

32. The explosion-proof valve according to claim 28, characterized in that: The notched groove coincides with the center axis of the sink.

33. The explosion-proof valve sheet according to claim 28, characterized in that: The sink comprises a second bottom, a third side wall and a fourth side wall, wherein the third side wall and the fourth side wall are arranged opposite to each other along the first direction. The third side wall includes a third arc segment and a fourth arc segment which are smoothly connected in sequence, the third arc segment is smoothly connected to the fourth surface, and the fourth arc segment is smoothly connected to the second groove bottom; the fourth side wall includes a fifth arc segment and a sixth arc segment which are smoothly connected in sequence, the fifth arc segment is smoothly connected to the fourth surface, and the sixth arc segment is smoothly connected to the second groove bottom.

34. The explosion-proof valve sheet according to claim 33, characterized in that: The curvature radius R3 of the third arc segment is 0.05 mm-0.3 mm, and the curvature radius R4 of the fourth arc segment is 0.05 mm-0.3 mm.

35. The explosion-proof valve according to claim 33, characterized in that: The curvature radius R5 of the fifth arc segment is 0.05 mm-0.3 mm, and the curvature radius R6 of the sixth arc segment is 0.05 mm-0.3 mm.

36. The explosion-proof valve disc according to claim 33, characterized in that: The curvature radius of the third arc segment is the same as or different from that of the fifth arc segment.

37. The explosion-proof valve sheet according to claim 33, characterized in that: The arc lengths of the third arc segment and the fifth arc segment are the same or different.

38. The explosion-proof valve sheet according to claim 33, characterized in that: The curvature radius of the fourth arc segment is the same as or different from that of the sixth arc segment.

39. The explosion-proof valve sheet according to claim 33, characterized in that: The arc lengths of the fourth arc segment and the sixth arc segment are the same or different.

40. The explosion-proof valve disc according to claim 33, characterized in that: In the first direction, the width A2 of the second groove bottom does not exceed 0.3 mm.

41. The explosion-proof valve according to claim 33, characterized in that: In the second direction, the depth H1 of the notch groove, the depth H2 of the sink groove and the thickness H4 of the second portion satisfy: (H1+H2):H4=(0.2-0.6):1, and the second direction intersects the first direction perpendicularly.

42. The explosion-proof valve disc according to claim 33 or 41, characterized in that: In the second direction, a ratio of a thickness H3 of the first portion to a thickness H4 of the second portion is 1:(0.25-0.95).

43. The explosion-proof valve disc according to claim 33, characterized in that: In the second direction, a thickness H3 of the first portion is 0.3 mm-2 mm.

44. The explosion-proof valve according to claim 33, characterized in that: In the second direction, a thickness H4 of the second portion is 0.1 mm-1.2 mm.

45. A top cover for a packaging container, characterized in that Comprising the explosion-proof valve plate described in any one of claims 1-44.

46. ​​A packaging container, characterized in that It comprises the explosion-proof valve sheet according to any one of claims 1 to 44 or the top cover of the packaging container according to claim 8.

47. A battery characterized by It comprises the explosion-proof valve sheet according to any one of claims 1 to 44, or the top cover of the packaging container according to claim 45, or the packaging container according to claim 46.

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