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, and the second nick is surrounded by the first nick; the first nick is constructed to be annular, and the area of an area defined by intersecting extension lines of the two ends of the outer periphery of the first nick is S1; the second nick comprises a stress concentration section and a reinforcing section, the stress concentration section and the opening are arranged at an interval in the first direction, one end of the reinforcing section is connected with the stress concentration section, the other end of the reinforcing section is located between one end of the reinforcing section and the opening in the first direction, and a straight line of one end of the stress concentration section and the other end of the reinforcing section is set as a first boundary line; a straight line passing through the other end of the stress concentration section and the other end of the reinforcing section is a second boundary line, and the area of a region defined by the outer side edge of the stress concentration section, the first boundary line and the second boundary line is S2; s1 and S2 meet the relational expression that 5% S1 < = S2 < = 45% S1. Therefore, a proper blasting force numerical value interval can be ensured.

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] In the prior art, the explosion-proof valve of the battery is usually welded on the cover plate of the battery. When the gas pressure in the battery exceeds the opening pressure of the explosion-proof valve, the explosion-proof valve can be opened to release the gas generated inside the battery to prevent the battery from exploding or other safety accidents. However, when the pressure in the battery changes and the pressure is too high, if the stability of the explosion-proof valve welded on the battery is not enough, it is easy to cause the entire explosion-proof valve to be opened during pressure release; if the stability of the explosion-proof valve welded on the battery is too strong, it is easy to cause the explosion-proof valve to fail to explode and release pressure in time. Both situations will damage the safety of the battery and the entire battery system. Utility Model Content

[0003] 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 that can ensure a suitable bursting force value range, thereby taking into account the connection strength and pressure relief opening ability at the first notch, and avoiding the risk of premature tearing and failure to timely burst and pressure relief due to the first notch being prone to misexplosion.

[0004] The utility model further proposes an explosion-proof valve.

[0005] The utility model further provides a single cell battery.

[0006] The utility model further provides a battery pack.

[0007] The utility model further provides an electric energy device.

[0008] According to the first aspect of the utility model, the bursting piece is provided with a first notch and a second notch, the second notch is surrounded by the first notch and is spaced apart from the first notch; the shape of the first notch is configured as a ring with an opening, and the area of ​​the region enclosed by the intersection of the two end extension lines of the outer peripheral edge of the first notch is S1; the second notch includes a stress concentration section and a reinforcement section, the stress concentration section and the opening are spaced apart along the first direction, one end of the reinforcement section is connected to the stress concentration section, and the other end of the reinforcement section is located between the one end of the reinforcement section and the opening in the first direction, a straight line passing through one end of the stress concentration section and the other end of the reinforcement section is set as the first boundary line, a straight line passing through the other end of the stress concentration section and the other end of the reinforcement section is set as the second boundary line, and the area of ​​the region enclosed by the outer edge of the stress concentration section, the first boundary line and the second boundary line is S2; wherein, S1 and S2 satisfy the relationship: 5%S1≤S2≤45%S1.

[0009] Therefore, by limiting the area size relationship between S1 and S2, a suitable bursting force value range can be ensured, thereby taking into account both the connection strength and the pressure relief opening capability at the first notch 11, thereby avoiding the risk of the first notch 11 being easily mis-exploded, resulting in premature tearing and failure to blast and relieve pressure in time.

[0010] In some examples of the present invention, S1 and S2 satisfy the relationship: 10% S1≤S2≤40% S1.

[0011] In some examples of the present invention, there is one second notch; or there are n second notches, and the n second notches are arranged at intervals, and S1 and S2 satisfy the relationship: 5%S1≤nS2≤45%S1, n≥2.

[0012] In some examples of the present invention, in the relative directions of the first boundary line and the second boundary line, the maximum distance between the outer edges of the first notch is d1, and the maximum distance between the outer edges of the first boundary line and the outer edges of the second boundary line is d2, and d1 and d2 satisfy the relationship: 25% d1≤d2≤85% d1.

[0013] In some examples of the present invention, the bursting piece includes: an explosion-proof body; a bursting body, the explosion-proof body 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 explosion-proof body is h1, the thickness of the bursting body is h2, and h1 and h2 satisfy: h1>h2.

[0014] In some examples of the present invention, the thickness of the first notch is h3, and h1, h2 and h3 satisfy: h1>h2>h3; and / or the thickness of the second notch is h4, and h1, h2 and h3 satisfy: h1>h2>h4.

[0015] In some examples of the present invention, 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>h3>h4.

[0016] In some examples of the present invention, the first notch includes a pressure relief opening segment disposed opposite to the opening, and a minimum distance between the stress concentration segment and the pressure relief opening segment is smaller than a minimum distance between the stress concentration segment and the opening.

[0017] In some examples of the present invention, the minimum distance between the stress concentration section and the pressure relief opening section is d3, and d3 satisfies: 1.5 mm ≥ d3 > 0.

[0018] In some examples of the present invention, the pressure relief opening section and the stress concentration section are arranged in parallel.

[0019] 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.

[0020] 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.

[0021] 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 shape protruding toward the pressure relief opening section or the opening.

[0022] 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.

[0023] In some examples of the present invention, the stress concentration section is constructed in a straight line and is arranged perpendicular to the reinforcement section; or the stress concentration section is constructed in an arc shape, and the reinforcement section is perpendicular to the straight line formed by connecting the two ends of the stress concentration section.

[0024] In some examples of the present invention, the reinforcement section is connected between two ends of the stress concentration section.

[0025] In some examples of the present invention, the reinforcement section is connected to the center of the stress concentration section.

[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 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 opening forming segment and a second opening forming segment, the extension line of the first opening forming segment and the extension line of the second opening forming segment coincide with and are parallel to the pressure relief opening segment, one end of the first opening forming segment is connected to one end of the first arc segment, one end of the second opening forming segment is connected to one end of the second arc segment, and the opening is formed between the other end of the first opening forming segment and the other end of the second opening forming segment; wherein the area enclosed by the outer periphery of the first arc segment, the outer periphery of the second arc segment, the outer periphery of the pressure relief opening segment, the outer periphery of the first opening forming segment and the outer periphery of the second opening forming segment is S1.

[0027] In some examples of the present invention, the pressure relief opening section, the first opening forming section and the second opening forming section are all configured in a straight line; or the pressure relief opening section, the first opening forming section and the second opening forming section are all configured in an arc line.

[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 1Sectional 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 It is a schematic structural diagram of a bursting disc according to another embodiment of the utility model.

[0040] Reference numerals:

[0041] 100. Explosion disc;

[0042] 1. Explosion body;

[0043] 11. first notch; 111. opening; 112. pressure relief opening section; 113. first arc section; 114. second arc section; 115. first opening forming section; 116. second opening forming section;

[0044] 12, second notch; 121, stress concentration section; 1211, first boundary line; 1212, second boundary line; 122, reinforcement section;

[0045] 2. Explosion-proof body. DETAILED DESCRIPTION

[0046] Embodiments of the present invention are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0047] Reference below Figure 1-Figure 5 The bursting disc 100 according to the embodiment of the present invention can ensure a suitable bursting force value range by limiting the area size relationship between S1 and S2, thereby taking into account both the connection strength at the first notch 11 and the pressure relief opening capability.

[0048] Combination Figure 1-Figure 5 As shown, according to the bursting piece 100 of the embodiment of the first aspect of the utility model, the bursting piece 100 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 second notch 12 is configured as a ring with a second opening 111, the second notch 12 is surrounded by the first notch 11, and the second notch 12 is spaced apart from the first notch 11.

[0049] Specifically, a first notch 11 is formed on the bursting disc 100 along the circumferential direction, and the first notch 11 is not connected at the beginning and the end, that is, the first notch 11 that is not connected at the beginning and the end has two opposite ends, 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 full circle of runway-type notches (no notch-free parts 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. Similarly, the second notch 12 is also not connected at the beginning and the end, and is spaced from the first notch 11 surrounding its periphery, so that the risk of part of the bursting disc 100 flying out directly during the detonation and pressure relief process can be avoided due to the second notch 12 and the first notch 11 or the second notch 12 itself forming a closed contour.

[0050] Furthermore, the area of ​​the region enclosed by the intersection of the extended lines at both ends of the outer peripheral edge of the first notch 11 is S1. It can be understood that the area enclosed by the intersection of the extended lines (extended according to the extension trend of the original line segment path, that is, the straight line connecting the two opposite end points of the first notch 11) at the two ends of the outer peripheral edge of the first notch 11 (that is, the fractures at both ends of the first notch 11) is S1.

[0051] Furthermore, the second notch 12 includes a stress concentration section 121 and a reinforcement section 122, the stress concentration section 121 and the opening 111 are spaced apart along the first direction, one end of the reinforcement section 122 is connected to the stress concentration section 121, and the other end of the reinforcement section 122 is located between one end of the reinforcement section 122 and the opening 111 in the first direction. For example, the first direction may be a front-to-back direction.

[0052] It is understandable that during the blasting process of the bursting disc 100, stress deformation is mainly concentrated at the stress concentration section 121, so it plays a role of stress concentration, and the reinforcement section 122 plays a role of reinforcement. When the bursting disc 100 is opened, since the reinforcement section 122 and the stress concentration section 121 are jointly constructed to form a relationship similar to the inverted "T"-shaped second notch 12, the stress is mostly concentrated near the stress concentration section 121, which will cause the stress concentration section 121 to deform first. When the deformation of the stress concentration section 121 reaches a certain height, it causes the stress concentration section 121 to tear at the adjacent local first notch 11, and the cracks extend to two places along the edge runway direction, and finally completely open the bursting disc 100.

[0053] Among them, the reinforcing effect of the reinforcing section 122 ensures that the material between the stress concentration section 121 and the base material is not easily deformed due to the force, effectively reducing the deformation height of the bursting disc 100 in the middle and rear part of the inverted "T"-shaped second notch 12, so that the local first notch 11 that is first subjected to the tearing force will tear without a high deformation. In addition, the inverted "T"-shaped second notch 12 allows the bursting disc 100 to be subjected to the force concentrated in the middle and rear part of the inverted "T" shape, while the bursting disc 100 without the inverted "T"-shaped second notch 12 in the middle, the stress is mostly concentrated in the middle part of the bursting disc 100 and the stress is relatively dispersed, and the angle θ tends to 0, which leads to the blasting process, the tearing force F is close to 0, which will require a higher detonation pressure to rupture the first notch 11.

[0054] In detail, a straight line passing through one end of the stress concentration section 121 and the other end of the reinforcement section 122 is set as a first boundary line 1211, a straight line passing through the other end of the stress concentration section 121 and the other end of the reinforcement section 122 is set as a second boundary line 1212, and an area enclosed by the outer edge of the stress concentration section 121, the first boundary line 1211, and the second boundary line 1212 is set as S2.

[0055] That is to say, in the first direction, the first boundary line 1211 and the second boundary line 1212 extend obliquely toward each other from the two ends of the stress concentration section 121 to the other end of the reinforcement section 122; in summary, the area of ​​the region enclosed by the outer edge of the stress concentration section 121, the first boundary line 1211 and the second boundary line 1212 connected in sequence is S2.

[0056] For example, combined with Figure 1 As shown, S1 is the area enclosed by the intersection of the extended lines (dashed lines) at the openings at both ends of the first notch 11 and the outer periphery of the original first notch 11, and S2 is the area enclosed by the outer edge of the stress concentration section 121, the first boundary line 1211 and the second boundary line 1212 connected in sequence.

[0057] For example, combined with Figure 5 As shown, S1 is the area enclosed by the intersection of the extended lines of the openings at both ends of the first notch 11 (the dotted lines extended according to the extension trend of the original arc) and the outer periphery of the original first notch 11, and S2 is the area enclosed by the outer edge of the stress concentration section 121, the first boundary line 1211 and the second boundary line 1212 connected in sequence.

[0058] In particular, S1 and S2 satisfy the size relationship of 5% S1≤S2≤45% S1, so that S2 can be associated with S1 and maintained within a reasonable range, thereby avoiding excessive or insufficient blasting force when the bursting piece 100 is detonated, thereby taking into account the connection stability and pressure relief opening capability of the bursting piece 100.

[0059] Among them, compared with S2 < 5% S1, the area of ​​S2 is too small at this time, which may cause the stress on the second notch 12 to be too concentrated, thereby causing the first notch 11 to reach the blasting force required for detonation prematurely, and the first notch 11 is prone to misexplosion and premature tearing; compared with S2 > 45% S1, the area of ​​S2 is too large at this time, which may cause the stress on the second notch 12 to be too dispersed and it is difficult to play the role of stress concentration, thereby causing the first notch 11 to fail to detonate in time, and then there is a risk that the battery pack cannot be depressurized in time.

[0060] Therefore, by limiting the area size relationship between S1 and S2, a suitable bursting force value range can be ensured, thereby taking into account both the connection strength and the pressure relief opening capability at the first notch 11, thereby avoiding the risk of the first notch 11 being easily mis-exploded, resulting in premature tearing and failure to blast and relieve pressure in time.

[0061] Preferably, S1 and S2 satisfy the relationship: 10% S1≤S2≤40% S1. Compared with S2<10% S1, the area of ​​S2 is too small at this time, which may cause the stress on the second notch 12 to be too concentrated, so that the first notch 11 reaches the blasting force required for detonation too early, and the first notch 11 is tearing due to accidental explosion; compared with S2>40% S1, the area of ​​S2 is too large at this time, which may cause the stress on the second notch 12 to be too dispersed and difficult to play the role of stress concentration, so that the first notch 11 cannot be detonated in time, and there is a risk that the battery pack cannot be depressurized in time.

[0062] Furthermore, if Figure 1 As shown, the first notch 11 includes a pressure relief opening segment 112 disposed opposite to the opening 111 , and the minimum distance between the stress concentration segment 121 and the pressure relief opening segment 112 is smaller than the minimum distance between the stress concentration segment 121 and the opening 111 .

[0063] It can be understood that a pressure relief opening section 112 is provided at a position on the first notch 11 corresponding to the opening 111, that is, the structural strength of the pressure relief opening section 112 is weaker than that of the structure at the opening 111. At this time, the position of the opening 111 is equivalent to the fulcrum, and the position of the pressure relief opening section 112 opposite to the opening 111 is equivalent to the point farthest from the fulcrum. According to the lever theorem, the farthest point is a weak point, which makes it easier for the bursting piece 100 to explode from the pressure relief opening section 112.

[0064] Among them, 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 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 quickly arches up to form an angle with the outer edge detonation point (pressure relief opening section 112), thereby playing the role of tearing the entire first notch 11.

[0065] In addition, compared with the prior art structure in which two semicircular notches intersect at the middle of the notches, 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 that the bursting piece 100 is easy to detonate in the middle and the detonation area is small, thereby facilitating the rapid pressure relief of the battery pack; compared with a single circle of "runway-type" notch structure (the stress on the notch is too dispersed, which is not conducive to the rapid explosion and opening of the bursting piece 100), 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.

[0066] Specifically, Figure 1 As shown, the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is d1, and d1 satisfies: 1.5mm≥d3>0. Among them, the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is less than 1.5mm, so that the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 can be prevented from being too large, so that on the basis of ensuring the critical detonation pressure of the bursting disc 100, it can also play a role in changing the detonation pressure position on the first notch 11, and reduce the detonation pressure required by the bursting disc 100, which is conducive to the rapid explosion of the bursting disc 100 to relieve pressure. For example, d3 is 0.5mm, 1mm or 1.5mm, but is not limited thereto.

[0067] In addition, if Figure 1 and Figure 4As shown, 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, and 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 it is possible to achieve detonation at a lower detonation pressure F. In the embodiment of this case, the second notch 12 similar to the inverted "T" shape allows the bursting disc 100 to be subjected to force concentrated in the middle and rear part of the inverted "T" shape, while the bursting disc 100 without the inverted "T"-shaped second notch 12 in the middle has stress concentrated in the middle of the bursting disc 100 and the stress is relatively dispersed, and the angle θ tends to 0, which causes the tearing force F1 to be close to 0 during the blasting process, and a higher detonation pressure is required to rupture the first notch 11.

[0068] Furthermore, if Figure 1 and Figure 5 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 excessive stress 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.

[0069] Specifically, Figure 1 and Figure 5 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.

[0070] It is understandable that if Figure 1 As shown, 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 portion of the bursting disc 100 sandwiched between the pressure relief opening section 112 and the stress concentration section 121, on the one hand, this can change the stress concentration position of the bursting disc 100, and on the other hand, it is beneficial to the consistency and stability of the crack development on the first notch 11 when the bursting disc 100 is detonated.

[0071] Further, 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.

[0072] Specifically, the pressure relief opening section 112 is configured as a straight line, and the stress concentration section 121 is configured as an arc shape protruding toward the pressure relief opening section 112 or the opening 111. It can be understood that the pressure relief opening section 112 is configured as a straight line, and the stress concentration section 121 is configured as 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.

[0073] Furthermore, if Figure 1 As shown, the reinforcement section 122 is constructed as a straight line extending from the stress concentration section 121 to the 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 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.

[0074] Alternatively, if Figure 1 As shown, the stress concentration section 121 is constructed in a straight line, and the stress concentration section 121 is arranged perpendicularly to the reinforcement section 122. The stress concentration section 121 is constructed in a straight line, which can ensure the accuracy and consistency of processing.

[0075] In addition, the stress concentration section 121 and the reinforcement section 122 are connected vertically. When the bursting piece 100 is subjected to gas pressure, the stress is concentrated at the stress concentration section 121. The reinforcement section 122 can enhance the bending and torsional rigidity of the bursting piece 100 in a direction perpendicular to the stress concentration section 121, so that the bursting piece 100 is not easily deformed in a direction perpendicular to the stress concentration section 121, and the deformation height of the bursting piece 100 near the stress concentration section 121 is effectively reduced, so that the pressure relief opening section 112 does not need a very high deformation amount before it will tear.

[0076] Alternatively, if Figure 5As shown, the stress concentration section 121 is constructed in an arc shape, and the reinforcing section 122 is perpendicular to the straight line formed by connecting the two ends of the stress concentration section 121. Among them, the stress concentration section 121 is constructed in an arc shape, so that the stress concentration area can be smaller, so that the initiation stress required by the bursting disc 100 is smaller, and the initiation pressure relief speed is faster, and the reinforcing section 122 and the straight line formed by connecting the two ends of the stress concentration section 121 are perpendicular to each other, so that the reinforcing section 122 can effectively strengthen 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 easily deformed in the direction perpendicular to the stress concentration section 121, and then effectively reduce 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 very high deformation to tear.

[0077] Specifically, Figure 1 and Figure 5 As 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 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.

[0078] Furthermore, if Figure 1 and Figure 5 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 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.

[0079] Specifically, Figure 1 As shown, in the relative directions of the first boundary line 1211 and the second boundary line 1212, the maximum distance between the outer edges of the first notch 11 is d1, and the maximum distance between the outer edges of the first boundary line 1211 and the outer edges of the second boundary line 1212 is d2, and d1 and d2 satisfy the relationship: 25% d1≤d2≤85% d1.

[0080] It can be understood that, in the relative direction of the first boundary line 1211 and the second boundary line 1212 (such as the left and right direction in the figure), the maximum distance d1 between the outer periphery of the first notch 11 and the maximum distance d2 between the outer periphery of the first reinforcement section 122 and the outer periphery of the second reinforcement section 122 satisfy the size relationship of 25% d1 ≤ d2 ≤ 85% d1. In this way, a correlation can be formed between d1 and d2 and maintained within a reasonable range, thereby avoiding excessive or insufficient blasting force when the bursting piece 100 is detonated, thereby taking into account both the connection stability and the pressure relief opening capability of the bursting piece 100.

[0081] Among them, compared with d2<25%d1, the maximum distance of d2 is too small at this time, which may cause the stress on the second notch 12 to be too concentrated, thereby causing the first notch 11 to reach the blasting force required for detonation prematurely, and then the first notch 11 will cause an accidental explosion and cause premature tearing; compared with d2>85%d1, the maximum distance of d2 is too large at this time, which may cause the stress on the second notch 12 to be too dispersed and it is difficult to play the role of stress concentration, thereby causing the first notch 11 to fail to detonate in time, and then there is a risk that the battery pack cannot be depressurized in time.

[0082] For example, Figure 1 As shown, the area formula of S1 is S1=(d1-d5)×d5+π×d52 / 4, d5 is the diameter of the first arc segment 113 and the second arc segment 114, and the area formula of S2 is S2=d2×d4 / 2, d4 is the sum of the length of the reinforcement segment 122 and the width of the stress concentration segment 121. Such a design is not only convenient for processing, but also can ensure the consistency and accuracy of the pressure required for detonation.

[0083] According to some optional embodiments of the present invention, there is one second notch 12; or there are n second notches 12, the n second notches 12 are arranged at intervals, and S1 and S2 satisfy the relationship: 5% S1≤nS2≤45% S1, n≥2.

[0084] Specifically, the first notch 11 is surrounded by a plurality of second notches 12, so that the combination of a plurality of similar second notches 12 can also achieve the effect of low detonation pressure and fast detonation speed. Among them, the sum of the areas S2 formed by the plurality of second notches 12 surrounding the first notch 11 and the S1 formed by the first notch 11 satisfy the size relationship of 5% S1 ≤ nS2 ≤ 45% S1, so that a suitable bursting force value range can be ensured, thereby taking into account the connection strength and pressure relief opening capability at the first notch 11, thereby avoiding the risk of the first notch 11 being easily torn by accident and failing to burst and relieve pressure in time.

[0085] According to some optional embodiments of the present invention, Figure 1 and Figure 5As shown, the first notch 11 further includes a first arc segment 113, a second arc segment 114, a pressure relief opening segment 112, a first opening forming segment 115, and a second opening forming segment 116. The first arc segment 113 and the second arc segment 114 are arranged opposite to each other and protrude in a direction away from each other. Both ends of the pressure relief opening segment 112 are respectively connected to one end of the first arc segment 113 and one end of the second arc segment 114. The extension line of the first opening forming segment 115 and the extension line of the second opening forming segment 116 coincide with each other and are parallel to the pressure relief opening segment 112. One end of the first opening forming segment 115 is connected to one end of the first arc segment 113, one end of the second opening forming segment 116 is connected to one end of the second arc segment 114, and an opening 111 is formed between the other end of the first opening forming segment 115 and the other end of the second opening forming segment 116; wherein, the area of ​​the region enclosed by the outer periphery of the first arc segment 113, the outer periphery of the second arc segment 114, the outer periphery of the pressure relief opening segment 112, the outer periphery of the first opening forming segment 115, and the outer periphery of the second opening forming segment 116 is S1.

[0086] For example, the area enclosed by the intersection of the outer peripheries of the first opening forming segment 115, the first arc segment 113, the pressure relief opening segment 112, the second arc segment 114 and the second opening forming segment 116 connected in sequence and the extended lines of the outer peripheries of the first opening forming segment 115 and the second opening forming segment 116 is S1.

[0087] In detail, the first opening forming section 115, the first arc section 113, the pressure relief opening section 112, the second arc section 114 and the second opening forming section 116 are connected in sequence, the extension line of the first opening forming section 115 and the extension line of the second opening forming section 116 coincide with each other, an opening 111 is spaced between the other end of the first opening forming section 115 and the other end of the second opening forming section 116, the first arc section 113 and the second arc section 114 protrude away from each other, that is, the first notch 11 is overall constructed to be similar to a runway shape with the opening 111, so that the notch structure is simpler, does not affect the critical pressure of the bursting disc 100, can also meet the explosion-proof strength requirements of the single cell, can also ensure the basic pressure relief function, and can also prevent the risk of the bursting disc 100 flying out during the detonation process.

[0088] Specifically, Figure 1 and Figure 5 As shown, the pressure relief opening section 112, the first opening forming section 115 and the second opening forming section 116 are all configured in a straight line; or the pressure relief opening section 112, the first opening forming section 115 and the second opening forming section 116 are all configured in an arc line.

[0089] That is, the pressure relief opening section 112, the first opening forming section 115 and the second opening forming section 116 are constructed in a straight line or an arc shape, which can easily ensure the accuracy and consistency of their processing. In addition, the connection between different scoring sections on the first scoring 11 adopts an arc transition, which is more convenient to ensure the processing and manufacturing of the first scoring 11 as an integrated molding.

[0090] According to some optional embodiments of the present invention, Figure 1 and Figure 5 As shown, the bursting disc 100 comprises an explosion-proof body 2 and a bursting body 1, wherein the explosion-proof body 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 explosion-proof body 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 explosion-proof body 2 after the trace grooves are formed in the first notch 11 and the second notch 12.

[0091] 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 explosion-proof body 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.

[0092] According to some optional embodiments of the present invention, the thickness of the second notch 12 is the same at all locations. This can ensure the processing consistency and accuracy of the second notch 12 on the one hand, and make the stress at 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.

[0093] As shown in the figures and the figures, the explosion-proof valve according to the second embodiment of the utility model includes the bursting disc 100 of the above embodiment, so that the explosion-proof valve with the bursting disc 100 can make the detonation pressure required by itself during explosion smaller and the pressure relief speed faster.

[0094] According to the third aspect of the utility model, the single cell battery includes the explosion-proof valve of the above embodiment. The single cell battery with the explosion-proof valve can release the high internal air pressure more quickly when a collision occurs inside the single cell battery causing a concentrated air pressure explosion, thereby improving the safety of the single cell battery.

[0095] The battery pack according to the fourth embodiment of the utility model includes multiple single cells of the above embodiments. The battery pack with the single cells 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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 second notch is surrounded by the first notch and is spaced apart from the first notch; The shape of the first notch is configured as a ring with an opening, and the area enclosed by the intersection of the two end extension lines of the outer periphery of the first notch is S1; The second notch includes a stress concentration section and a reinforcement section, the stress concentration section and the opening are arranged at intervals along the first direction, one end of the reinforcement section is connected to the stress concentration section, and the other end of the reinforcement section is located between the one end of the reinforcement section and the opening in the first direction, a straight line passing through the one end of the stress concentration section and the other end of the reinforcement section is set as a first boundary line, a straight line passing through the other end of the stress concentration section and the other end of the reinforcement section is set as a second boundary line, and an area enclosed by the outer edge of the stress concentration section, the first boundary line and the second boundary line is S2; Among them, S1 and S2 satisfy the relationship: 5% S1≤S2≤45% S1.

2. The bursting disc according to claim 1, characterized in that: S1 and S2 satisfy the relationship: 10% S1 ≤ S2 ≤ 40% S1.

3. The bursting disc according to claim 1, characterized in that: The number of the second notch is one; or There are n second notches, and the n second notches are arranged at intervals, and S1 and S2 satisfy the relationship: 5% S1≤nS2≤45% S1, n≥2.

4. The bursting disc according to claim 1, characterized in that: In the relative directions of the first boundary line and the second boundary line, the maximum distance between the outer edges of the first notches is d1, and the maximum distance between the outer edges of the first boundary line and the second boundary line is d2, and d1 and d2 satisfy the relationship: 25% d1≤d2≤85% d1.

5. The bursting disc according to claim 1, characterized in that: The bursting disc comprises: Explosion-proof body; A blasting body, the explosion-proof body is arranged around the blasting body, and the first notch and the second notch are arranged on the blasting body; The thickness of the explosion-proof body is h1, the thickness of the blasting body is h2, and h1 and h2 satisfy: h1>h2.

6. The bursting disc according to claim 5, characterized in that: The thickness of the first notch is h3, and h1, h2 and h3 satisfy: h1>h2>h3; and / or the thickness of the second notch is h4, and h1, h2 and h3 satisfy: h1>h2>h4.

7. The bursting disc according to claim 5, characterized in that: 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>h3>h4.

8. The bursting disc according to claim 1, characterized in that: The first notch includes a pressure relief opening segment arranged opposite to the opening, and a minimum distance between the stress concentration segment and the pressure relief opening segment is smaller than a minimum distance between the stress concentration segment and the opening.

9. The bursting disc according to claim 8, characterized in that: The minimum distance between the stress concentration section and the pressure relief opening section is d3, and d3 satisfies: 1.5 mm ≥ d3 > 0.

10. The bursting disc according to claim 8, characterized in that The pressure relief opening section and the stress concentration section are arranged in parallel.

11. The bursting disc according to claim 10, 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.

12. The bursting disc according to claim 8, 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.

13. The bursting disc according to claim 12, 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 or the opening.

14. The bursting disc according to claim 1, characterized in that The reinforcement section is configured as a straight line extending from the stress concentration section toward the opening.

15. The bursting disc according to claim 14, characterized in that The stress concentration section is constructed in a straight line and is arranged perpendicular to the reinforcement section; or The stress concentration section is configured in an arc shape, and the reinforcement section is perpendicular to a straight line formed by connecting two ends of the stress concentration section.

16. The bursting disc according to claim 1, characterized in that The reinforcement section is connected between two ends of the stress concentration section.

17. The bursting disc according to claim 16, characterized in that The reinforcement section is connected to the center of the stress concentration section.

18. 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 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 opening forming section and a second opening forming section, wherein an extension line of the first opening forming section coincides with an extension line of the second opening forming section and is parallel to the pressure relief opening section, one end of the first opening forming section is connected to one end of the first arc section, one end of the second opening forming section is connected to one end of the second arc section, and the opening is formed between the other ends of the first opening forming section and the second opening forming section; The area of ​​the region enclosed by the outer periphery of the first arc segment, the outer periphery of the second arc segment, the outer periphery of the pressure relief opening segment, the outer periphery of the first opening forming segment and the outer periphery of the second opening forming segment is S1.

19. The bursting disc according to claim 18, characterized in that The pressure relief opening section, the first opening forming section and the second opening forming section are all configured in a straight line; or The pressure relief opening section, the first opening forming section and the second opening forming section are all configured in an arc shape.

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

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

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

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

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

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