Rupture disc, explosion-proof valve, single battery, battery pack and electric energy equipment

Abstract

The utility model discloses a rupture disk, an explosion-proof valve, a single battery, a battery pack and electric energy equipment, the rupture disk is provided with a first nick and a second nick, the shape of the first nick is configured to be a ring with a first opening, and two opposite end points of the first nick are configured to be two opposite ends of the first opening; the first nick comprises a pressure relief opening section arranged opposite to the first opening, at least part of the second nick is surrounded by the first nick and a connecting line of the two opposite end points, and the second nick and the first nick are arranged at an interval; the second nick comprises a stress concentration section, and the minimum distance between the stress concentration section and the pressure relief opening section is smaller than the minimum distance between the stress concentration section and the first opening. Therefore, through the arrangement of the rupture disk, the rupture disk can be opened from the edge more easily, pressure relief is faster, and the needed detonation pressure is smaller.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a bursting disc, an explosion-proof valve, a single battery, a battery pack and electric energy equipment. Background Art

[0002] Batteries are designed into different shapes according to different production and living needs. Regardless of the shape of the battery, the market's demand for safety is constantly increasing. How to improve battery safety performance has become a long-term goal for battery manufacturers. The bursting disc is a very critical component to ensure battery safety. When the pressure inside the battery increases and exceeds the safety threshold, it is very important whether the bursting disc can release the pressure in time. Therefore, the stability of the bursting disc explosion is a very critical factor in ensuring battery safety performance. When the high pressure formed inside the battery reaches the threshold of the bursting disc, the bursting disc is flushed open and the battery is depressurized, greatly reducing the risk of battery explosion.

[0003] In the related art, an elliptical battery bursting piece is generally provided with a circle of "racetrack-shaped" notches. Although the bursting piece with this notch structure is simple in structure, the stress of the notch structure is too dispersed, which is not conducive to the rapid blasting of the bursting piece. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a bursting disc, which can make the bursting disc easier to open from the edge, release pressure more quickly, and require a smaller detonation pressure.

[0005] The utility model further proposes an explosion-proof valve.

[0006] The utility model further provides a single cell battery.

[0007] The utility model further provides a battery pack.

[0008] The utility model further provides an electric energy device.

[0009] According to the bursting piece of the first aspect of the utility model, the bursting piece is provided with a first notch and a second notch, the shape of the first notch is configured as a ring with a first opening, and the opposite two end points of the first notch are configured as the opposite two ends of the first opening; the first notch includes a pressure relief opening section arranged opposite to the first opening, the second notch is at least partially surrounded by the first notch and the connecting line of the opposite two end points, and the second notch is spaced apart from the first notch; the second notch includes a stress concentration section, and the minimum distance between the stress concentration section and the pressure relief opening section is smaller than the minimum distance between the stress concentration section and the first opening.

[0010] Thus, the stress concentration section on the second notch can change the stress concentration position of the bursting disc, that is, the minimum distance between the stress concentration section and the pressure relief opening section is smaller than the minimum distance between the stress concentration section and the first opening, so that part of the bursting disc between the stress concentration section and the pressure relief opening section can be quickly arched when subjected to a smaller detonation pressure, thereby tearing the notch on the pressure relief opening section at the outer edge detonation point earlier, and then extending the tearing path from the pressure relief opening section to the first notches on both sides thereof. In summary, by setting up the bursting disc, it is easier to open the bursting disc from the edge, the pressure relief is faster, and the required detonation pressure is smaller.

[0011] In some examples of the present invention, the pressure relief opening section and the stress concentration section are arranged in parallel.

[0012] In some examples of the present invention, the pressure relief opening section and the stress concentration section are constructed as straight lines parallel to each other; or the pressure relief opening section and the stress concentration section are constructed as arcs parallel to each other.

[0013] In some examples of the present invention, one of the pressure relief opening section and the stress concentration section is configured in an arc shape and the other is configured in a straight line shape.

[0014] In some examples of the present invention, the pressure relief opening section is configured as a straight line, and the stress concentration section is configured as an arc convex toward the pressure relief opening section.

[0015] In some examples of the present invention, the second notch further includes: a reinforcement section, which is connected to the stress concentration section and is located on a side of the stress concentration section facing the first opening.

[0016] In some examples of the present invention, the reinforcement section is configured as a straight line extending from the stress concentration section toward the opening.

[0017] In some examples of the present invention, the reinforcement section is connected between two ends of the stress concentration section.

[0018] In some examples of the present invention, the reinforcement section is connected to the center of the stress concentration section.

[0019] In some examples of the present invention, the stress concentration section is constructed in a straight line and is disposed perpendicular to the reinforcement section.

[0020] In some examples of the present invention, the reinforcement section is connected to an end of the stress concentration section.

[0021] In some examples of the present invention, the second notch further includes: a transition arc segment, and the transition arc segment is connected between the reinforcement segment and the stress concentration segment.

[0022] In some examples of the present invention, there are at least two reinforcement segments and include: a first reinforcement segment and a second reinforcement segment, one end of the first reinforcement segment and one end of the second reinforcement segment are respectively connected to the two ends of the stress concentration segment, and a second opening is formed between the other end of the first reinforcement segment and the other end of the second reinforcement segment.

[0023] In some examples of the present invention, the distance between the first reinforcement segment and the second reinforcement segment gradually increases in a direction toward the opening.

[0024] In some examples of the present invention, the first reinforcement segment and the second reinforcement segment are arranged in parallel.

[0025] In some examples of the present invention, the minimum distance between the stress concentration section and the pressure relief opening section is d1, and d1 satisfies: d1>1mm.

[0026] In some examples of the present invention, the first notch also includes: a first arc segment and a second arc segment, the first arc segment and the second arc segment are arranged opposite to each other and protrude in a direction away from each other; a pressure relief opening segment, the pressure relief opening segment is configured in a straight line, and the two ends of the pressure relief opening segment are respectively connected to one end of the first arc segment and one end of the second arc segment; a first straight line segment and a second straight line segment, the extension line of the first straight line segment and the extension line of the second straight line segment coincide with and are parallel to the pressure relief opening segment, one end of the first straight line segment is connected to one end of the first arc segment, one end of the second straight line segment is connected to one end of the second arc segment, and the first opening is formed between the other end of the first straight line segment and the other end of the second straight line segment.

[0027] In some examples of the present invention, the bursting piece includes: a connecting base; a bursting body, the connecting base is arranged around the bursting body, and the first notch and the second notch are arranged on the bursting body; wherein the thickness of the connecting base is H1, the thickness of the bursting body is H2, the thickness of the first notch is H3, the thickness of the second notch is H4, and H1, H2, H3 and H4 satisfy: H1>H2>H4>H3.

[0028] In some examples of the present invention, the thickness of each second notch is the same.

[0029] The explosion-proof valve according to the second aspect of the utility model comprises: the above-mentioned bursting disc.

[0030] A single cell battery according to a third aspect of the utility model comprises: the above-mentioned explosion-proof valve.

[0031] The battery pack according to the fourth aspect of the utility model comprises: a plurality of the above-mentioned single cells.

[0032] The electric energy device according to the fifth aspect of the utility model comprises: a device body and the above-mentioned battery pack.

[0033] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] Figure 1 is a schematic structural diagram of a bursting disc according to an embodiment of the utility model;

[0036] Figure 2 yes Figure 1 Sectional view in the AA direction;

[0037] Figure 3 yes Figure 2 Enlarged view of the middle C area;

[0038] Figure 4 yes Figure 1 Force analysis diagram of the rupture disc in the middle BB direction during the detonation process;

[0039] Figure 5 is a schematic structural diagram of a bursting disc according to another embodiment of the utility model;

[0040] Figure 6 is a schematic structural diagram of a bursting disc according to another embodiment of the utility model;

[0041] Figure 7 is a schematic structural diagram of a bursting disc according to another embodiment of the utility model;

[0042] Figure 8 is a schematic structural diagram of a bursting disc according to another embodiment of the utility model;

[0043] Fig. 9 is a schematic structural diagram of a bursting disc according to another embodiment of the utility model;

[0044] Fig.10 is a schematic structural diagram of a bursting disc according to another embodiment of the utility model;

[0045] Fig.11 It is a schematic structural diagram of a single cell according to an embodiment of the utility model.

[0046] Reference numerals:

[0047] 100, bursting disc; 200, explosion-proof valve; 300, single battery;

[0048] 1. blasting body; 11. first notch; 111. first opening; 112. pressure relief opening section;

[0049] 113, first endpoint; 114, second endpoint; 115, connecting line;

[0050] 113, first arc segment; 114, second arc segment; 115, first straight line segment; 116, second straight line segment;

[0051] 12, second notch; 121, stress concentration section; 122, reinforcement section; 1221, first reinforcement section;

[0052] 1222, second reinforcement section; 1223, second opening; 123, transition arc section; 2, connection base. DETAILED DESCRIPTION

[0053] Embodiments of the present invention are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0054] Reference below Figure 1-Figure 11 The bursting disc 100 according to the embodiment of the present invention is described, which can make the bursting disc 100 easier to open from the edge, release pressure more quickly, and require a smaller detonation pressure.

[0055] Combination Figure 1-Figure 11 As shown, the bursting disc 100 according to the first embodiment of the utility model is provided with a first notch 11 and a second notch 12. The shape of the first notch 11 is configured as a ring with a first opening 111. The opposite end points of the first notch 11 (such as Figure 1 The first end point 113 and the second end point 114 shown in FIG. 1 are configured as opposite ends of the first opening 111, the first notch 11 includes a pressure relief opening section 112 arranged opposite to the first opening 111, and the second notch 12 is at least partially surrounded by the first notch 11 and the opposite end points (such as Figure 1 114) of the first terminal 113 and the second terminal 114 shown in FIG. Figure 1 ) is surrounded by the second notch 12, and the second notch 12 is spaced apart from the first notch 11. The second notch 12 includes a stress concentration section 121. The minimum distance between the stress concentration section 121 and the pressure relief opening section 112 (as shown in Figure 1 d1) is smaller than the minimum distance between the stress concentration section 121 and the first opening 111 (as shown in Figure 1 as shown in d2).

[0056] Specifically, the first notch 11 is formed on the bursting disc 100 along the circumferential direction, and the first notch 11 is not connected at the head and tail, that is, the tail is not connected to the two opposite ends of the first notch 11, and there is no notch between the two opposite ends, so that the shape of the first notch 11 is configured as a ring with a first opening 111. Compared with a complete circle of runway-shaped notches (no non-notch portion connected to the substrate), this can avoid the risk of the bursting disc 100 flying out during the detonation and pressure relief process and causing a battery short circuit, thereby improving safety.

[0057] A pressure relief opening section 112 is provided at a position on the first notch 11 corresponding to the first opening 111, that is, the structural strength at the pressure relief opening section 112 is weaker than that at the first opening 111. At this time, the position of the first opening 111 is equivalent to the fulcrum, and the position of the pressure relief opening section 112 opposite to the first opening 111 is equivalent to the point farthest from the fulcrum. According to the lever theorem, the farthest point is a weak point, so that the bursting piece 100 is easier to explode from the pressure relief opening section 112.

[0058] Furthermore, if Figure 1-Figure 4 As shown, the first notch 11 surrounds the second notch 12, and the second notch 12 and the first notch 11 are spaced apart, so as to avoid the risk that the first notch 11 and the second notch 12 form a closed contour, which may cause part of the bursting disc 100 to fly out directly during the detonation and pressure relief process.

[0059] In detail, Figure 1 and Figure 4 As shown, the stress concentration section 121 on the second notch 12 can change the stress concentration position of the bursting disc 100, that is, the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is smaller than the minimum distance between the stress concentration section 121 and the first opening 111, so that the portion of the bursting disc 100 between the stress concentration section 121 and the pressure relief opening section 112 can be quickly arched when subjected to a smaller detonation pressure, thereby tearing the notch on the pressure relief opening section 112 at the outer edge detonation point earlier, and then extending the tearing path from the pressure relief opening section 112 to the first notches 11 on both sides thereof. For example, when the bursting disc 100 is subjected to force, the notch at the stress concentration section 121 is quickly arched to form an angle with the outer edge detonation point (pressure relief opening section 112), thereby playing the role of tearing the entire second notch 12.

[0060] In addition, compared with the structural form of two semicircular notches intersecting at the middle of the notch in the prior art, the stress concentration section 121 in the embodiment of this case is closer to the first notch 11 at the outer edge, which is more conducive to detonating the first notch 11 at the outer edge, avoiding the problem of the bursting piece 100 being easily detonated in the middle and the small detonation area, thereby facilitating the rapid pressure relief of the battery pack; compared with a single circle of "runway-type" notch structure (the stress on its notch is too dispersed, which is not conducive to the rapid explosion and opening of the bursting piece), the embodiment in this case makes the opening part of the bursting piece 100 (that is, the pressure relief opening section 112) more consistent, the detonation pressure is more stable, and the required detonation pressure is also smaller, which is conducive to battery pressure relief.

[0061] Therefore, by providing the bursting disc 100, it is possible to make the bursting disc 100 easier to open from the edge, release pressure more quickly, and require a smaller detonation pressure.

[0062] According to some optional embodiments of the present invention, Figure 1 , Figure 5 , Figure 8-Figure 10 As shown, the pressure relief opening section 112 and the stress concentration section 121 are arranged in parallel. The distance between the pressure relief opening section 112 and the stress concentration section 121 is equal everywhere, so that the risk of stress transition concentration at a certain point causing the bursting disc 100 to be easily detonated and cause misexplosion can be avoided, thereby reserving a certain safety buffer space for the detonation gas pressure of the bursting disc 100.

[0063] Specifically, Figure 1 , Figure 5 and Fig.10 As shown, the pressure relief opening section 112 and the stress concentration section 121 are constructed as straight lines parallel to each other; or the pressure relief opening section 112 and the stress concentration section 121 are constructed as arcs parallel to each other. It can be understood that when the pressure relief opening section 112 and the stress concentration section 121 are both straight lines, they are parallel to each other, which makes it easier to ensure the consistency of processing. In addition, since the pressure relief opening section 112 and the stress concentration section 121 evenly weaken the structural strength of the upper edge of the area of ​​the bursting disc 100 sandwiched between the pressure relief opening section 112 and the stress concentration section 121, on the one hand, it can play a role in changing the stress concentration position of the bursting disc 100, and on the other hand, it is conducive to the consistency and stability of the crack development on the first notch 11 when the bursting disc 100 is detonated.

[0064] According to some optional embodiments of the present invention, Figure 6 and Figure 7As shown, one of the pressure relief opening section 112 and the stress concentration section 121 is configured in an arc shape, and the other of the pressure relief opening section 112 and the stress concentration section 121 is configured in a straight line shape. For example, the stress concentration section 121 is configured in a straight line shape, and the pressure relief opening section 112 is configured in an arc shape, so that the stress concentration area can be smaller, so that the stress can be more quickly concentrated on the bursting disc 100 between the two, so that the bursting disc 100 can obtain a faster detonation speed, and the detonation sensitivity of the bursting disc 100 is improved.

[0065] Specifically, Figure 7 As shown, the pressure relief opening section 112 is constructed in a straight line shape, and the stress concentration section 121 is constructed in an arc shape that protrudes toward the pressure relief opening section 112. It can be understood that the pressure relief opening section 112 is constructed in a straight line shape, and the stress concentration section 121 is constructed in an arc shape, so that the stress concentration area can be smaller, thereby making the initiation stress required by the bursting disc 100 smaller and the initiation pressure relief speed faster.

[0066] According to some optional embodiments of the present invention, Figure 1 , Figure 5-Figure 10 As shown, the second notch 12 further includes a reinforcement section 122, which is connected to the stress concentration section 121 and is located on the side of the stress concentration section 121 facing the first opening 111. In detail, the reinforcement section 122 extends toward the side of the first opening 111, so that the material between the stress concentration section 121 and the first notch 11 except the pressure relief opening section 112 is not easily deformed due to the force, thereby effectively reducing the deformation height of the bursting disc 100 near the stress concentration section 121, and further allowing the pressure relief opening section 112 on the first notch 11 to tear without a high deformation amount.

[0067] Specifically, Figure 1 , Figure 5-Figure 10 As shown, the reinforcement section 122 is constructed as a straight line extending from the stress concentration section 121 to the first opening 111. It can be understood that the reinforcement section 122 is constructed as a straight line, so that the spatial mode between the stress concentration section 121 and the first opening 111 can be increased, thereby reducing the detonation force required for the bursting disc 100 between the stress concentration section 121 and the pressure relief opening section 112 when detonating, and on the other hand, the pressure can be more concentrated in the area between the stress concentration section 121 and the pressure relief opening section 112, which is conducive to improving the rapid detonation of the bursting disc 100.

[0068] Furthermore, if Figure 5 and Fig. 9As shown, the reinforcement section 122 is connected between the two ends of the stress concentration section 121. One end of the reinforcement section 122 is connected between the two ends of the stress concentration section 121, and the other end extends toward the first opening 111. This can enhance the bending and torsional rigidity of the bursting disc 100 in a direction perpendicular to the stress concentration section 121, so that the bursting disc 100 is not easily deformed in this direction; on the other hand, it can also reduce the number of notches, thereby reducing the workload.

[0069] Specifically, Figure 5 and Fig. 9 As shown, the reinforcement section 122 is connected to the center of the stress concentration section 121. It can be understood that one end of the reinforcement section 122 is connected to the center of the stress concentration section 121, and the other end extends toward the first opening 111, so that the bending and torsional rigidity of the bursting disc 100 on both sides of the center of the stress concentration section 121 can be uniformly increased, thereby improving the consistency and uniformity of the crack tearing on the first notch 11.

[0070] Furthermore, if Figure 1 , Figure 5 and Fig.10 As shown, the stress concentration section 121 is constructed in a straight line, and the stress concentration section 121 is arranged vertically with the reinforcement section 122. Among them, the stress concentration section 121 is constructed in a straight line, so that the accuracy and consistency of processing can be guaranteed. In addition, the stress concentration section 121 and the reinforcement section 122 are connected vertically. When the bursting disc 100 is subjected to air pressure, the stress is concentrated at the stress concentration section 121, and the reinforcement section 122 strengthens the bending and torsional rigidity of the bursting disc 100 in the direction perpendicular to the stress concentration section 121, so that the bursting disc 100 is not easy to deform in the direction perpendicular to the stress concentration section 121, effectively reducing the deformation height of the bursting disc 100 near the stress concentration section 121, so that the pressure relief opening section 112 does not need a high deformation to tear.

[0071] Specifically, Figure 1 , Figure 6-Figure 8 and Fig.10 As shown, the reinforcement section 122 is connected to the end of the stress concentration section 121. One end of the reinforcement section 122 is connected to the center of the stress concentration section 121, and the other end extends toward the first opening 111, so that the bending and torsional rigidity of the bursting disc 100 in a direction perpendicular to the stress concentration section 121 can be strengthened, so that the bursting disc 100 is not easily deformed in this direction, and the deformation height required for the bursting disc 100 to be detonated near the stress concentration section 121 is effectively reduced, thereby improving the detonation sensitivity of the bursting disc 100.

[0072] Furthermore, if Figure 1 and Fig.10As shown, the second notch 12 further includes a transition arc segment 123, and the transition arc segment 123 is connected between the strengthening segment 122 and the stress concentration segment 121. It can be understood that the transition arc segment 123 serves to uniformly transition and connect the strengthening segment 122 and the stress concentration segment 121, avoiding the formation of a stress concentration area at the connection between the strengthening segment 122 and the stress concentration segment 121. Thus, on the one hand, it ensures the processing continuity of the integral molding of the second notch 12, and on the other hand, it ensures that the strengthening segment 122 and the stress concentration segment 121 do not interfere with each other's functions.

[0073] Specifically, as Figure 1 and Fig.10 shown, the strengthening segment 122 has at least two and includes a first strengthening segment 1221 and a second strengthening segment 1222. One end of the first strengthening segment 1221 and one end of the second strengthening segment 1222 are respectively connected to both ends of the stress concentration segment 121, and a second opening 1223 is formed between the other end of the first strengthening segment 1221 and the other end of the second strengthening segment 1222.

[0074] It can be understood that during the bursting process of the rupture disk 100, the stress concentration segment 121 plays a role in stress concentration, and the strengthening segment 122 plays a strengthening role. The stress deformation is mainly concentrated at the stress concentration segment 121. The pressure relief opening segment 112 is mainly subjected to a tearing force, which is also the main reason for the prior opening of the pressure relief opening segment 112. When the rupture disk 100 is opened, due to the relationship between the strengthening segment 122 and the stress concentration segment 121 being in a relationship similar to a "U"-shaped notch, the stress is mostly concentrated near the stress concentration segment 121, which causes the stress concentration segment 121 to deform first. When the deformation at the stress concentration segment 121 reaches a certain height, a tear appears at the pressure relief opening segment 112, and the crack spreads in two directions along the edge runway direction, finally completely opening the rupture disk 100.

[0075] Among them, the strengthening effect of the strengthening segment 122 ensures that the material between the stress concentration segment 121 and the base material is not easily deformed by force, effectively reducing the deformation height of the lower part of the "U"-shaped rupture disk 100 in the middle, so that the notch 3 can be torn with a relatively low deformation amount. And the "U"-shaped notch causes the force on the rupture disk 100 to be concentrated in the lower part of the "U"-shaped notch. For the rupture disk 100 without a "U"-shaped notch in the middle, the stress is mostly concentrated in the middle of the rupture disk 100 and is relatively dispersed, and the angle θ tends to 0, which leads to a tearing force F1 approaching 0 during the bursting process, and a higher detonation pressure is required to rupture the notch.

[0076] In addition, in this case, the direction of the second opening 1223 in the embodiment is the same as the direction of the first opening 111 on the outer edge. The position of the first opening 111 on the outer edge is equivalent to a fulcrum, and the position of the notch (pressure relief opening section 112) opposite the first opening 111 is equivalent to the point farthest from the fulcrum. According to the lever principle, it can be known that the farthest point is the weak point of strength. The setting of the second opening 1223 further weakens the strength of this point, making it easier for the rupture disk 100 to burst at the pressure relief opening section 112.

[0077] Optionally, a plurality of second notches 12 in a "U" shape surround the first notch 11. Such a combination of a plurality of similar second notches 12 can also achieve the effects of a small detonation pressure and a fast detonation speed.

[0078] Furthermore, as Figure 7 shown, the distance between the first strengthening section 1221 and the second strengthening section 1222 gradually increases in the direction towards the first opening 111. It can be understood that the first strengthening section 1221 and the second strengthening section 1222 are respectively connected to one end of the stress concentration section 121, and the distance between the first strengthening section 1221 and the second strengthening section 1222 shows an increasing trend in the direction towards the first opening 111. In this way, the extension paths parallel to the stress concentration section 121 and perpendicular to the stress concentration section 121 can be decomposed, thereby further enhancing the stress concentration effect of the stress concentration section 121. It can also increase the area where the strengthening section 122 strengthens the structural stiffness of the rupture disk 100 between the stress concentration section 121 and the first opening 111, thereby improving the detonation reliability of the rupture disk 100.

[0079] Specifically, as Figure 1 and Figure 6 shown, the first strengthening section 1221 and the second strengthening section 1222 are arranged in parallel. It can be understood that the distance between the first strengthening section 1221 and the second strengthening section 1222 is equal everywhere, which is convenient for ensuring the consistency and accuracy of processing.

[0080] According to some optional embodiments of the present invention, as Figure 1 shown, the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is d1, and d1 satisfies: d1 > 1 mm. Among them, the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is greater than 1 mm. In this way, on the basis of ensuring the critical pressure of the rupture disk 100, it can also play a role in concentrating the detonation pressure position on the first notch 11, reducing the detonation pressure required for the rupture disk 100, which is beneficial for the rupture disk 100 to burst quickly for pressure relief. For example, d1 is 1.5 mm, 2 mm or 3 mm, and is not limited thereto.

[0081] Specifically, when the stress concentration section 121 is closer to the pressure relief opening section 112, the material deformation angle θ between the stress concentration section 121 and the pressure relief opening section 112 is larger. The relationship between the tearing force F1 and the vertical force F generated by the air pressure is Fsinθ = F1. Therefore, when the angle θ is larger, the tearing force F1 is larger, so detonation can be achieved at a lower detonation pressure F. In the embodiment of this case, the notch similar to the "U" shape makes the force on the rupture disk 100 concentrate on the middle and lower parts of the "U" shape. For the rupture disk 100 without the "U" shaped notch in the middle, the stress mostly concentrates in the middle of the rupture disk 100 and is relatively dispersed, and the angle θ tends to 0, which leads to the tearing force F1 approaching 0 during the blasting process, and a higher detonation pressure is required to rupture the notch.

[0082] According to some alternative embodiments of the present invention, as Figure 1 shown, the first notch 11 further includes a first arc segment 113, a second arc segment 114, a pressure relief opening section 112, a first straight segment 115, and a second straight segment 116. The first arc segment 113 and the second arc segment 114 are oppositely arranged, and the first arc segment 113 and the second arc segment 114 protrude away from each other. The pressure relief opening section 112 is configured as a straight line. The two ends of the pressure relief opening section 112 are respectively connected to one end of the first arc segment 113 and one end of the second arc segment 114. The extension lines of the first straight segment 115 and the second straight segment 116 coincide, and the extension lines of the first straight segment 115 and the second straight segment 116 are parallel to the pressure relief opening section 112. One end of the first straight segment 115 is connected to one end of the first arc segment 113, one end of the second straight segment 116 is connected to one end of the second arc segment 114, and a first opening 111 is formed between the other end of the first straight segment 115 and the other end of the second straight segment 116.

[0083] Specifically, the first straight segment 115, the first arc segment 113, the pressure relief opening section 112, the second arc segment 114, and the second straight segment 116 are sequentially connected. The extension lines of the first straight segment 115 and the second straight segment 116 coincide with each other. A first opening 111 is spaced between the other end of the first straight segment 115 and the other end of the second straight segment 116. The first arc segment 113 and the second arc segment 114 protrude away from each other, that is, the overall structure of the first notch 11 is similar to a runway shape with a first opening 111. In this way, the notch structure form is simpler, does not affect the critical pressure of the rupture disk 100, can meet the explosion-proof strength requirements of the single cell 300, can also ensure the basic pressure relief function, and can also prevent the risk of the rupture disk 100 flying out during the detonation process.

[0084] According to some alternative embodiments of the present invention, as Figure 1 、 Figure 5-Figure 7As shown, the bursting disc 100 comprises a connecting base 2 and a bursting body 1, wherein the connecting base 2 is arranged around the bursting body 1, and the first notch 11 and the second notch 12 are arranged on the bursting body 1; wherein the thickness of the connecting base 2 is H1, the thickness of the bursting body 1 is H2, the thickness of the first notch 11 is H3, and the thickness of the second notch 12 is H4, and H1, H2, H3 and H4 satisfy: H1>H2>H4>H3. wherein the thickness of the first notch 11 and the second notch 12 refers to the remaining thickness of the connecting base 2 after the trace grooves are formed in the first notch 11 and the second notch 12.

[0085] Specifically, this thickness distribution relationship can ensure that the second score 12 changes the stress concentration position on the bursting disc 100 and does not explode before the detonation area (pressure relief opening section 112), that is, the bursting disc 100 can be accurately exploded at the pressure relief opening section 112, preventing the phenomenon of insufficient pressure relief area caused by the explosion at the position of the second score 12, and ensuring the consistency and accuracy of the pressure required for the detonation of the bursting disc 100. In addition, the thickness of the connecting base 2 is greater than the thickness of the bursting body 1, so that the strength of the base material welding area of ​​the bursting disc 100 can also be ensured.

[0086] According to some optional embodiments of the present invention, Figure 1-Figure 4 As shown, the thickness of the second notch 12 is the same at all locations, which can ensure the processing consistency and accuracy of the second notch 12 on the one hand, and make the stress on all locations on the second notch 12 more uniform on the other hand, thereby ensuring the consistency of the detonation pressure of the bursting disc 100.

[0087] Optionally, the relative positions of the stress concentration section 121 and the reinforcement section 122 are in a vertical relationship. In order to facilitate processing, the connection is connected with an arc angle; the relationship between the length C1 of the second notch 12 and the length B1 of the stress concentration section 121 must satisfy B1+d1<C1 and d1≥1mm, and the relationship between the width D1 of the second notch 12 and the length A1 of the reinforcement section 122 satisfies D1>A1, so that the problem of excessive or insufficient detonation pressure can be avoided, so that the detonation critical pressure is within an appropriate range.

[0088] like Fig.11 As shown, the explosion-proof valve 200 according to the second embodiment of the utility model includes the bursting disc 100 of the above embodiment, so that the explosion-proof valve 200 with the bursting disc 100 can make the detonation pressure required by itself during explosion smaller and the pressure relief speed faster.

[0089] like Fig.11As shown, the single cell battery 300 according to the third aspect embodiment of the utility model includes the explosion-proof valve 200 of the above embodiment, so that the single cell battery 300 with the explosion-proof valve 200 can more quickly dissipate the internal high air pressure when encountering a collision inside itself causing a concentrated air pressure explosion, thereby improving the safety of the single cell battery 300.

[0090] The battery pack according to the fourth embodiment of the utility model comprises a plurality of single cells 300 of the above embodiments, so that the battery pack having the single cells 300 can promptly and quickly release the pressure of the battery pack in a sudden high-voltage state, thereby improving the safety of the battery pack.

[0091] The electric energy device according to the fifth embodiment of the utility model includes a device body and a battery pack of the above embodiment, and the electric energy device can be a vehicle, an aircraft, a ship, an energy storage device or a household appliance, etc. The vehicle and other equipment with the battery pack can improve its safety and ensure the safety of the user.

[0092] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0093] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0094] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0095] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A bursting disc, characterized in that: The bursting disc is provided with a first notch and a second notch, wherein the shape of the first notch is configured as a ring having a first opening, and the opposite two end points of the first notch are configured as the opposite two ends of the first opening; the first notch includes a pressure relief opening section arranged opposite to the first opening, the second notch is at least partially surrounded by the first notch and a connecting line of the opposite two end points, and the second notch is spaced apart from the first notch; the second notch includes a stress concentration section, and the minimum distance between the stress concentration section and the pressure relief opening section is smaller than the minimum distance between the stress concentration section and the first opening.

2. The bursting disc according to claim 1, characterized in that: The pressure relief opening section and the stress concentration section are arranged in parallel.

3. The bursting disc according to claim 2, characterized in that: The pressure relief opening section and the stress concentration section are constructed in straight lines parallel to each other; or The pressure relief opening section and the stress concentration section are constructed in the shape of arcs parallel to each other.

4. The bursting disc according to claim 1, characterized in that: One of the pressure relief opening section and the stress concentration section is configured in an arc shape, and the other is configured in a straight line shape.

5. The bursting disc according to claim 4, characterized in that: The pressure relief opening section is configured as a straight line, and the stress concentration section is configured as an arc convex toward the pressure relief opening section.

6. The bursting disc according to any one of claims 1 to 5, characterized in that: The second notch also includes: A reinforcement section is connected to the stress concentration section and is located on a side of the stress concentration section facing the first opening.

7. The bursting disc according to claim 6, characterized in that: The reinforcement section is configured as a straight line extending from the stress concentration section toward the opening.

8. The bursting disc according to claim 7, characterized in that: The reinforcement section is connected between two ends of the stress concentration section.

9. The bursting disc according to claim 8, characterized in that: The reinforcement section is connected to the center of the stress concentration section.

10. The bursting disc according to claim 7, characterized in that: The stress concentration section is constructed in a straight line and is arranged perpendicular to the reinforcement section.

11. The bursting disc according to claim 7, characterized in that: The reinforcement section is connected to the end of the stress concentration section.

12. The bursting disc according to claim 11, characterized in that The second notch also includes: A transition arc segment is connected between the reinforcement segment and the stress concentration segment.

13. The bursting disc according to claim 7, characterized in that: The reinforcement sections are at least two and include: A first reinforcement section and a second reinforcement section, one end of the first reinforcement section and one end of the second reinforcement section are respectively connected to two ends of the stress concentration section, and a second opening is formed between the other end of the first reinforcement section and the other end of the second reinforcement section.

14. The bursting disc according to claim 13, characterized in that The distance between the first reinforcement section and the second reinforcement section gradually increases in a direction toward the opening.

15. The bursting disc according to claim 13, characterized in that The first reinforcement section and the second reinforcement section are arranged in parallel.

16. The bursting disc according to claim 1, characterized in that The minimum distance between the stress concentration section and the pressure relief opening section is d1, and d1 satisfies: d1>1mm.

17. The bursting disc according to claim 1, characterized in that The first notch also includes: a first arc segment and a second arc segment, wherein the first arc segment and the second arc segment are arranged opposite to each other and protrude in a direction away from each other; A pressure relief opening section, wherein the pressure relief opening section is configured in a straight line, and two ends of the pressure relief opening section are respectively connected to one end of the first circular arc section and one end of the second circular arc section; A first straight line segment and a second straight line segment, an extension line of the first straight line segment and an extension line of the second straight line segment coincide with each other and are parallel to the pressure relief opening segment, one end of the first straight line segment is connected to one end of the first arc segment, one end of the second straight line segment is connected to one end of the second arc segment, and the first opening is formed between the other end of the first straight line segment and the other end of the second straight line segment.

18. The bursting disc according to claim 1, characterized in that The bursting disc comprises: Connecting substrates; A blasting body, the connecting base is arranged around the blasting body, and the first notch and the second notch are arranged on the blasting body; The thickness of the connection base is H1, the thickness of the blasting body is H2, the thickness of the first notch is H3, the thickness of the second notch is H4, and H1, H2, H3 and H4 satisfy: H1>H2>H4>H3.

19. The bursting disc according to claim 1, characterized in that The thickness of the second notch is the same at all locations.

20. An explosion-proof valve, characterized in that: include: A bursting disc as claimed in any one of claims 1 to 19.

21. A single cell battery, characterized in that: include: The explosion-proof valve according to claim 20.

22. A battery pack, characterized in that: include: A plurality of single cells as claimed in claim 21.

23. An electric energy device, characterized in that: include: The device body and the battery pack as claimed in claim 22.

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