Anti-explosion nick structure, anti-explosion valve plate, packaging container and battery

Abstract

The utility model discloses an anti-explosion nick structure, an anti-explosion valve plate, a packaging container and a battery. The anti-explosion nick structure comprises a first groove-shaped structure arranged on the first surface of the base body and a second groove-shaped structure arranged at the bottom of the first groove-shaped structure in the thickness direction of the base body, and a groove opening of the second groove-shaped structure is located in the first groove bottom of the first groove-shaped structure. The second groove bottom of the second groove-shaped structure is of a plane structure or a cambered surface structure. The explosion-proof nick structure provided by the utility model can be used on a shell of a battery shell and also can be used on a cover plate, and the explosion value of the explosion-proof nick structure is more stable.

Description

Technical Field

[0001] The utility model particularly relates to an explosion-proof notch structure, an explosion-proof valve sheet, a packaging container and a battery, and belongs to the technical field of explosion-proof packaging containers. Background Art

[0002] With the progress of the times, the sustainable development of new energy has become the mainstream. For new energy, batteries are a vital link. However, in recent years, safety accidents caused by battery failures have emerged one after another, so battery safety issues have received more and more attention. When a battery fails, a large amount of gas can be generated in a short period of time. If there is no pressure relief port at this time, an explosion accident is likely to occur.

[0003] The existing battery explosion-proof structure is partially arranged on the battery explosion-proof sheet, and the connecting sheet is fixed on the upper surface of the cover plate for explosion-proof. In terms of material cost, this method requires the addition of an explosion-proof sheet, which is not easy to form and has a high production cost. In addition, the existing battery explosion-proof structure is partially arranged at the bottom of the battery shell, and a direct notching method is adopted, which is easy to cause damage to the product due to stress concentration, and the material will be greatly deformed due to compression during notching. When the material is greatly deformed, the remaining thickness cannot be guaranteed. Utility Model Content

[0004] The main purpose of the utility model is to provide an explosion-proof notch structure, an explosion-proof valve sheet, a packaging container and a battery, so as to overcome the deficiencies in the prior art.

[0005] In order to achieve the above-mentioned utility model purpose, the technical solution adopted by the utility model includes:

[0006] The first aspect of the utility model provides an explosion-proof notch structure, which is arranged on the surface of a substrate, and the explosion-proof notch structure includes: a first groove-like structure arranged on the first surface of the substrate, and a second groove-like structure arranged at the bottom of the first groove-like structure along the thickness direction of the substrate, the notch of the second groove-like structure is located at the first groove bottom of the first groove-like structure, and the second groove bottom of the second groove-like structure is a plane structure or a curved surface structure.

[0007] The second aspect of the utility model provides an explosion-proof valve plate, on which the explosion-proof notch structure is provided.

[0008] The third aspect of the utility model is a packaging container, on which the explosion-proof notch structure or the explosion-proof valve sheet is arranged.

[0009] A fourth aspect of the utility model is a battery, comprising a battery shell and a battery core, wherein the battery shell is provided with the explosion-proof notch structure or the explosion-proof valve sheet.

[0010] Compared with the prior art, the advantages of the utility model include:

[0011] The utility model provides an explosion-proof notch structure which can be used on the shell of a battery shell and also on a cover plate;

[0012] The forming process of the explosion-proof notched structure provided by the utility model is relatively simple, and the accuracy of the remaining thickness after notching can be ensured, so that the explosion-proof effect can be well played;

[0013] The explosion value of the explosion-proof notch structure provided by the utility model is more stable, and can effectively prevent explosion accidents caused by leakage due to battery failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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.

[0015] Figure 1 It is a structural schematic diagram of an explosion-proof valve plate provided in a typical implementation case of the utility model;

[0016] Figure 2 yes Figure 1 The cross-section formed along AA in the middle;

[0017] Figure 3 yes Figure 2 A partial enlarged view of the structure B in the middle;

[0018] Figure 4 It is a structural schematic diagram of an explosion-proof notch structure provided in a typical implementation case of the utility model. DETAILED DESCRIPTION

[0019] 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.

[0020] The first aspect of the utility model provides an explosion-proof notch structure, which is arranged on the surface of a substrate, and the explosion-proof notch structure includes: a first groove-like structure arranged on the first surface of the substrate, and a second groove-like structure arranged at the bottom of the first groove-like structure along the thickness direction of the substrate, the notch of the second groove-like structure is located at the first groove bottom of the first groove-like structure, and the second groove bottom of the second groove-like structure is a plane structure or a curved surface structure.

[0021] Furthermore, a second orthographic projection area formed by the second groove-like structure along the thickness direction of the substrate is completely located within a first orthographic projection area formed by the first groove-like structure along the thickness direction of the substrate, and the depth directions of the first groove-like structure and the second groove-like structure are parallel to the thickness direction of the substrate.

[0022] Furthermore, the first groove bottom of the first groove-like structure has a first area and a second area, the second area is distributed on both sides of the first area along the width direction of the first groove-like structure, and the notch of the second groove-like structure is located in the first area.

[0023] Furthermore, the width of the notch of the second groove-shaped structure is smaller than the width of the first groove bottom.

[0024] Furthermore, the maximum depth of the first groove-shaped structure is greater than the maximum depth of the second groove-shaped structure.

[0025] Furthermore, the maximum depth of the second groove-shaped structure is 30% to 95% of the maximum depth of the first groove-shaped structure.

[0026] Furthermore, the width of the first groove-like structure is uniformly arranged along the thickness direction of the substrate, or the width of the first groove-like structure gradually decreases along the thickness direction of the substrate.

[0027] Furthermore, the width of the second groove-shaped structure gradually decreases in a direction away from the first groove-shaped structure, or the width of the second groove-shaped structure is uniformly arranged in a thickness direction of the substrate.

[0028] Furthermore, the first groove-shaped structure is a mirror-symmetrical structure.

[0029] Furthermore, the second groove-shaped structure is a mirror-symmetrical structure.

[0030] Furthermore, a central axis of the first groove-shaped structure is parallel to a central axis of the second groove-shaped structure.

[0031] Furthermore, the longitudinal cross-section of the second groove-shaped structure is a triangle with rounded top angles, the rounded structure corresponds to the second groove bottom, and the longitudinal cross-section of the first groove-shaped structure is a rectangle or an inverted trapezoid.

[0032] Furthermore, the second groove-shaped structure also has a first side wall and a second side wall that are arranged opposite to each other along its width direction, and the angle between the first side wall and the second side wall is an acute angle.

[0033] Furthermore, the first side wall, the second side wall and the second groove bottom are smoothly connected.

[0034] Furthermore, the first side wall, the second side wall and the first groove bottom are smoothly connected.

[0035] Furthermore, the arc surface structure is a concave structure that is recessed in a direction away from the first groove-shaped structure.

[0036] Furthermore, the radius of curvature of the circular surface structure is 0.06 mm to 0.12 mm.

[0037] Furthermore, the explosion-proof notch structure also includes: a third groove-shaped structure arranged on the second surface of the substrate, the third groove-shaped structure is arranged back to back along the thickness direction of the substrate, and the second surface and the first surface are arranged back to back along the thickness direction of the substrate.

[0038] Furthermore, a third orthographic projection area formed by the third groove-shaped structure along the thickness direction of the substrate is completely located within the first orthographic projection area.

[0039] Furthermore, the second orthographic projection area is completely located within the third orthographic projection area.

[0040] Furthermore, the third groove-shaped structure is a mirror-symmetrical structure.

[0041] Furthermore, central axes of the third groove-shaped structure, the first groove-shaped structure, and the second groove-shaped structure are parallel.

[0042] Furthermore, the thickness of the matrix remaining between the third groove-shaped structure and the second groove-shaped structure is 0.05 mm to 0.15 mm.

[0043] The second aspect of the utility model provides an explosion-proof valve disc, on which the explosion-proof notch structure is arranged. It can be understood that in the explosion-proof valve disc, the base in the explosion-proof notch structure is the explosion-proof valve disc.

[0044] Furthermore, the explosion-proof notch is a ring structure, or the explosion-proof notch is a line segment structure.

[0045] The third aspect of the utility model is a packaging container, on which the explosion-proof notch structure or the explosion-proof valve sheet is arranged.

[0046] A fourth aspect of the utility model is a battery, comprising a battery shell and a battery core, wherein the battery shell is provided with the explosion-proof notch structure or the explosion-proof valve sheet.

[0047] Furthermore, the battery shell includes a shell body and a top cover sheet, the shell body is connected to the top cover sheet and encloses a packaging space, the explosion-proof notch structure is arranged on the shell body and / or the top cover sheet, or the explosion-proof valve sheet is arranged on the shell body and / or the top cover sheet.

[0048] The technical solution, its implementation process and principle will be further explained below in conjunction with the accompanying drawings and specific implementation cases.

[0049] See also Figure 1 and Figure 2 , an explosion-proof valve plate 100, on which at least one explosion-proof notched structure 200 is arranged, and the explosion-proof notched structure 200 is a continuous annular structure. Preferably, the explosion-proof notched structure 200 can be a circular ring structure, and the center of the explosion-proof notched structure 200 can coincide with the center of the explosion-proof valve plate 100. The circular ring-shaped explosion-proof notched structure 200 is more likely to tear when subjected to pressure, thereby releasing pressure to the maximum extent, thereby avoiding causing an explosion accident.

[0050] For details, please refer to Figure 3 and Figure 4 The explosion-proof notch structure 200 includes a first groove-like structure arranged on the first surface of the explosion-proof valve plate, and a second groove-like structure arranged at the bottom of the first groove-like structure along the thickness direction of the explosion-proof valve plate, wherein the notch of the second groove-like structure is located at the first groove bottom of the first groove-like structure, wherein the first groove-like structure is a rectangular groove (actually refers to the longitudinal section formed by the first groove-like structure along the width direction is a rectangle, therefore, the first groove-like structure can also be referred to as a rectangular groove), and the second groove-like structure is a rounded triangle groove (actually refers to the longitudinal section formed by the second groove-like structure along the width direction is a rounded triangle, therefore, the first groove-like structure can also be referred to as a rounded triangle groove), the depth L1 of the first groove-like structure is greater than the depth L2 of the second groove-like structure, and preferably, the maximum depth H2 of the second groove-like structure is 30% to 95% of the maximum depth H1 of the first groove-like structure, thereby not only ensuring that the explosion-proof valve plate has a stable bursting value, but also reducing the deformation of the explosion-proof valve plate when the second groove-like structure is formed by stamping, thereby further maintaining the stability of the bursting value of the explosion-proof valve plate.

[0051] Specifically, further punching is performed on the basis of the rectangular groove to form a rounded triangular groove, which is not only conducive to the formation of the notch structure, but also reduces the amount of cutting required for the notch. At the same time, a structure combining a rounded triangular groove and a rectangular groove is adopted, and the rounded triangular groove has an inclination angle of the top angle. Compared with the notch structure of the rectangular groove, from the perspective of material forming, the resistance to the material being punched when forming the notch structure in the utility model is relatively small, which is more conducive to the forming of the material. In addition, when punching to form the notch structure, there is a rounded corner at the bottom of the punching tool. Compared with a punching tool with a sharp corner, the probability of the tool with a rounded corner becoming blunt is greatly reduced, thereby increasing the tool's service life. Secondly, when the tool has a sharp corner, a sharp notch will be left on the product, and the product will be subjected to a greater problem of stress concentration.

[0052] Specifically, the second orthographic projection area formed by the second groove-like structure along the thickness direction of the explosion-proof valve plate (the depth direction of the first groove-like structure and the second groove-like structure is the thickness direction of the explosion-proof valve plate) is completely located within the first orthographic projection area formed by the first groove-like structure along the thickness direction of the explosion-proof valve plate, that is, the groove width L2 of the second groove-like structure is smaller than the width L1 of the first groove bottom of the first groove-like structure (the width of the first groove bottom is the width of the first groove-like structure).

[0053] As a preferred solution, the first groove bottom of the first groove-like structure has a first area and a second area, the second area is distributed on both sides of the first area along the width direction of the first groove-like structure, and the groove opening of the second groove-like structure is located in the first area. More preferably, the groove opening of the second groove-like structure is arranged correspondingly in the middle area of ​​the first groove bottom of the first groove-like structure.

[0054] Specifically, the first groove-shaped structure is a mirror-symmetrical structure, and the second groove-shaped structure is a mirror-symmetrical structure. It can be understood that the symmetry axis of the first groove-shaped structure is its own central axis, and the symmetry axis of the second groove-shaped structure is also its own central axis. Figure 3 The CC axis in the middle is the center axis of the two. The notch structure is a circular ring, the second groove structure is a triangular cross-section and the first groove structure is a rectangular cross-section, so that when the product is subjected to pressure to explode and tear, the notch structure and the surrounding parts can be opened to the maximum extent, thereby quickly releasing the pressure and preventing explosion.

[0055] Specifically, the second groove-like structure also has a first side wall and a second side wall arranged opposite to each other along its own width direction, and the angle a formed by the first side wall and the second side wall is an acute angle. More specifically, the angle a formed by the first side wall and the second side wall is 50°~90°, and the intersection of the first side wall and the second side wall forms a rounded structure. It can be understood that the intersection of the first side wall and the second side wall can be understood as the second groove bottom of the second groove-like structure, and the second groove bottom is an arc surface structure recessed along the depth direction of the second groove-like structure, preferably an arc surface structure, wherein the curvature radius R of the arc surface structure is 0.06mm~0.12mm.

[0056] Specifically, the first side wall, the second side wall and the first groove bottom may also be smoothly connected.

[0057] For details, please refer to Figure 3 and Figure 4 The explosion-proof notch structure also includes a third groove-shaped structure arranged on the second surface of the explosion-proof valve sheet, the third groove-shaped structure is arranged back to back along the thickness direction of the explosion-proof valve sheet, the thickness of the valve sheet remaining between the second groove-shaped structure and the third groove-shaped structure corresponds to the bursting value of the explosion-proof valve sheet, the thickness of the explosion-proof valve sheet remaining between the third groove-shaped structure and the second groove-shaped structure is 0.05mm~0.15mm, and the second surface and the first surface are arranged back to back along the thickness direction of the explosion-proof valve sheet.

[0058] Specifically, the third orthographic projection area formed by the third groove-like structure along the thickness direction of the explosion-proof valve plate is completely located within the first orthographic projection area, and the second orthographic projection area is completely located within the third orthographic projection area, that is, the width of the first groove-like structure is greater than the maximum width of the second groove-like structure and the third groove-like structure.

[0059] Specifically, the third groove-like structure is an arc surface groove. Preferably, the third groove-like structure is an arc surface groove. The third groove-like structure is a mirror-symmetrical structure. The axis of symmetry of the third groove-like structure is its own central axis. More specifically, the central axes of the third groove-like structure, the first groove-like structure, and the second groove-like structure are parallel.

[0060] Specifically, a processing technology for an explosion-proof valve plate may include the following steps: providing an explosion-proof valve plate precursor, placing the explosion-proof valve plate on a processing platform, and punching a rectangular groove on the first surface of the explosion-proof valve plate, arranging a boss on the processing platform, and making the boss correspond to the rectangular groove, and at the same time, using a triangular notching knife with rounded corners to process the bottom of the rectangular groove to form a rounded triangular groove, and then cutting off excess waste to obtain the explosion-proof valve plate.

[0061] Before processing to form the rounded triangular groove, a rectangular groove is first punched on the explosion-proof valve plate. This will reduce the amount of cutting when notching, thereby reducing the force on the tool, which is beneficial to the service life of the tool. An annular boss is set on the back of the explosion-proof valve plate. When the explosion-proof valve plate is squeezed, it will extend toward the boss, which is beneficial to the forming of the material.

[0062] After punching the rectangular groove, in order to ensure the depth of the notched structure, a boss is added when forming the rounded triangular groove. The notching knife and the boss cooperate to notch the product. The boss not only plays a positioning role, but also ensures the accuracy of the remaining thickness, thereby ensuring the blasting value.

[0063] The depth of the rectangular groove should be greater than that of the rounded triangle groove, so as to ensure the accuracy of the remaining thickness. If the depth of the rectangular groove is less than that of the rounded triangle groove, the depth of the notch structure is large, and the tool has a large amount of cutting when notching, which is not conducive to the service life of the tool. Secondly, due to the ductility of the material under pressure, when the material thickness is thicker during notching, the material will extend outward, and the accuracy of the remaining thickness cannot be guaranteed. If the depth of the rectangular groove is greater than that of the rounded triangle groove, the resistance of the notching tool will be reduced, and the deformation of the material under pressure will also be reduced. In addition, the positioning effect of the boss can maximize the accuracy of the remaining thickness. When the pressure in the sealed container reaches a certain value, because the rectangular groove and the rounded triangle groove are circular ring-shaped, they are prone to tearing under pressure, thereby maximizing the pressure release and avoiding explosion accidents.

[0064] 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 notch structure, arranged on the surface of a substrate, characterized in that: The explosion-proof notch structure includes: a first groove-like structure arranged on the first surface of the substrate, and a second groove-like structure arranged at the bottom of the first groove-like structure along the thickness direction of the substrate, the notch of the second groove-like structure is located at the first groove bottom of the first groove-like structure, and the second orthographic projection area formed by the second groove-like structure along the thickness direction of the substrate is completely located within the first orthographic projection area formed by the first groove-like structure along the thickness direction of the substrate, the depth directions of the first groove-like structure and the second groove-like structure are parallel to the thickness direction of the substrate, the second groove bottom of the second groove-like structure is a plane structure or a curved surface structure, the first groove bottom of the first groove-like structure has a first area and a second area, the second area is distributed on both sides of the first area along the width direction of the first groove-like structure, and the notch of the second groove-like structure is located in the first area.

2. The explosion-proof notch structure according to claim 1, characterized in that: The width of the notch of the second groove-shaped structure is smaller than the width of the first groove bottom.

3. The explosion-proof notch structure according to claim 1, characterized in that: The maximum depth of the first groove-like structure is greater than the maximum depth of the second groove-like structure.

4. The explosion-proof notch structure according to claim 3, characterized in that: The maximum depth of the second groove-shaped structure is 30% to 95% of the maximum depth of the first groove-shaped structure.

5. The explosion-proof notch structure according to claim 2, characterized in that: The width of the first groove-like structure is uniformly arranged along the thickness direction of the substrate, or the width of the first groove-like structure gradually decreases along the thickness direction of the substrate, and the width of the second groove-like structure gradually decreases in a direction away from the first groove-like structure.

6. The explosion-proof notched structure according to claim 2 or 5, characterized in that: The first groove-shaped structure is a mirror-symmetrical structure.

7. The explosion-proof notched structure according to claim 2 or 5, characterized in that: The second groove-shaped structure is a mirror-symmetrical structure.

8. The explosion-proof notched structure according to claim 2 or 5, characterized in that: The central axis of the first groove-shaped structure is parallel to the central axis of the second groove-shaped structure.

9. The explosion-proof notched structure according to claim 2 or 5, characterized in that: The longitudinal cross-section of the second groove-shaped structure is a triangle with a rounded apex, and the rounded apex corresponds to the second groove bottom, or the longitudinal cross-section of the second groove-shaped structure is an inverted trapezoid.

10. The explosion-proof notched structure according to claim 2 or 5, characterized in that: The longitudinal cross-section of the first groove-shaped structure is rectangular or inverted trapezoidal.

11. The explosion-proof notch structure according to claim 5, characterized in that: The second groove-shaped structure further comprises a first side wall and a second side wall which are arranged opposite to each other along its width direction, and the angle between the first side wall and the second side wall is an acute angle.

12. The explosion-proof notch structure according to claim 11, characterized in that: The first side wall, the second side wall and the second groove bottom are smoothly connected.

13. The explosion-proof notch structure according to claim 11, characterized in that: The first side wall, the second side wall and the first groove bottom are smoothly connected.

14. The explosion-proof notch structure according to claim 5, characterized in that: The arc surface structure is a concave structure that is recessed in a direction away from the first groove structure.

15. The explosion-proof notched structure according to claim 5 or 14, characterized in that: The curvature radius of the arc surface structure is 0.06mm~0.12mm.

16. The explosion-proof notch structure according to claim 1, characterized in that: The explosion-proof notch structure further includes: a third groove-shaped structure arranged on the second surface of the substrate, the third groove-shaped structure is arranged back to back along the thickness direction of the substrate, and the second surface and the first surface are arranged back to back along the thickness direction of the substrate.

17. The explosion-proof notch structure according to claim 16, characterized in that: A third orthographic projection area formed by the third groove-shaped structure along the thickness direction of the substrate is completely located within the first orthographic projection area.

18. The explosion-proof notch structure according to claim 17, characterized in that: The second orthographic projection area is completely located within the third orthographic projection area.

19. The explosion-proof notch structure according to claim 16, characterized in that: The third groove-shaped structure is a mirror-symmetrical structure.

20. The explosion-proof notched structure according to claim 16, characterized in that: Central axes of the third groove-shaped structure, the first groove-shaped structure, and the second groove-shaped structure are parallel.

21. The explosion-proof notched structure according to claim 16, characterized in that: The thickness of the substrate remaining between the third groove-shaped structure and the second groove-shaped structure is 0.05 mm to 0.15 mm. 22.An explosion-proof valve disc, characterized in that: The explosion-proof valve plate is provided with an explosion-proof notch structure according to any one of claims 1 to 21.

23. The explosion-proof valve sheet according to claim 22, characterized in that: The explosion-proof notch is a ring structure, or the explosion-proof notch is a line segment structure.

24. A packaging container, characterized in that: The packaging container is provided with an explosion-proof notch structure as described in any one of claims 1 to 21 or an explosion-proof valve sheet as described in claim 22 or 23.

25. A battery, comprising a battery case and a battery cell, characterized in that: The battery shell is provided with an explosion-proof notch structure as described in any one of claims 1 to 21 or an explosion-proof valve sheet as described in claim 22 or 23.

26. The battery according to claim 25, characterized in that: The battery shell includes a shell body and a top cover sheet, wherein the shell body is connected to the top cover sheet and encloses a packaging space, and the explosion-proof notch structure is arranged on the shell body and / or the top cover sheet, or the explosion-proof valve sheet is arranged on the shell body and / or the top cover sheet.

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