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

Abstract

The utility model discloses a rupture disk, explosion-proof valve, battery cell, 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, the shape of the second nick is configured to be a ring with a second opening, and the second nick is configured to be a ring with a second opening. The second nick is surrounded by the first nick, the second nick and the first nick are arranged at intervals, 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 area of an area defined by connecting straight lines of the two ends of the outer periphery of the second nick is S2, and S1 and S2 meet the relational expression that S2 is larger than or equal to 10% S1 and smaller than or equal to 90% S1. Therefore, by limiting the area size relation of the S1 and the S2, a proper blasting force numerical value interval can be guaranteed, so that the connection strength and the pressure relief opening capacity of the first nick are both considered, and the risks that the first nick is prone to being exploded and torn by mistake and cannot be exploded and relieved pressure in time are avoided.

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 easy accidental explosion and tearing at the first notch and failure to timely explode and relieve pressure.

[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 bursting piece of the first aspect of the utility model, the bursting piece is provided with a first notch and a second notch, the first notch is shaped as a ring with a first opening, the second notch is shaped as a ring with a second opening, the second notch is surrounded by the first notch and is spaced apart from the first notch, the area of ​​the region enclosed by the intersection of the extended lines at both ends of the outer periphery of the first notch is S1, the area of ​​the region enclosed by the straight lines connecting the two ends of the outer periphery of the second notch is S2, and S1 and S2 satisfy the relationship: 10% S1≤S2≤90% 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 at the first notch and the pressure relief opening capability, thereby avoiding the risk of accidental explosion and tearing at the first notch and failure to blast and relieve pressure in time.

[0010] In some examples of the present invention, S1 and S2 satisfy the relationship: 25% S1≤S2≤85% 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: 10% S1≤nS2≤90% S1, n≥2.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] In some examples of the present invention, the second opening is located on a side of the second notch facing the first opening.

[0016] In some examples of the present invention, the second notch includes: a stress concentration section; 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 the two ends of the stress concentration section, and the second opening is formed between the other end of the first reinforcement section and the other end of the second reinforcement section; wherein the area of ​​the region enclosed by the outer periphery of the stress concentration section, the outer periphery of the first reinforcement section and the outer periphery of the second reinforcement section is S2.

[0017] In some examples of the present invention, in the relative directions of the first reinforcement segment and the second reinforcement segment, the maximum distance between the outer peripheries of the first notch is d1, and the maximum distance between the outer peripheries of the first reinforcement segment and the outer peripheries of the second reinforcement segment is d2, and d1 and d2 satisfy the relationship: 25% d1≤d2≤85% d1.

[0018] In some examples of the present invention, the first notch includes a pressure relief opening segment arranged opposite to the first 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 first opening.

[0019] 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: 1.5 mm ≥ d3 > 0.

[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 convex toward the pressure relief opening section.

[0022] In some examples of the present invention, the pressure relief opening section and the stress concentration section are arranged in parallel.

[0023] 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.

[0024] In some examples of the present invention, the first reinforcement segment and the second reinforcement segment are configured as straight lines extending from the stress concentration segment toward the first opening.

[0025] In some examples of the present invention, the stress concentration section is configured in a straight line and is disposed perpendicular to the first reinforcement section and the second reinforcement section.

[0026] In some examples of the present invention, the second notch also includes: a first transition arc segment, the first transition arc segment is connected to the first reinforcement segment and connected to the stress concentration segment; a second transition arc segment, the second transition arc segment is connected to the second reinforcement segment and connected to the stress concentration segment; the area of ​​the region enclosed by the outer periphery of the stress concentration segment, the outer periphery of the first reinforcement segment, the outer periphery of the second reinforcement segment, the outer periphery of the first transition arc segment and the outer periphery of the second transition arc segment is S2.

[0027] In some examples of the present invention, the first reinforcement segment and the second reinforcement segment are arranged in parallel.

[0028] 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.

[0029] 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 first 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 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.

[0030] 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.

[0031] In some examples of the present invention, the thickness of each second notch is the same.

[0032] The explosion-proof valve according to the second aspect of the utility model comprises: the above-mentioned bursting disc.

[0033] A single cell battery according to a third aspect of the utility model comprises: the above-mentioned explosion-proof valve.

[0034] The battery pack according to the fourth aspect of the utility model comprises: a plurality of the above-mentioned single cells.

[0035] The electric energy device according to the fifth aspect of the utility model comprises: a device body and the above-mentioned battery pack.

[0036] 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

[0037] 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:

[0038] Figure 1 is a schematic structural diagram of a bursting disc according to an embodiment of the utility model;

[0039] Figure 2 yes Figure 1Sectional view in the AA direction;

[0040] Figure 3 yes Figure 2 Enlarged view of the middle C area;

[0041] Figure 4 yes Figure 1 Force analysis diagram of the rupture disc in the middle BB direction during the detonation process;

[0042] Figure 5 is a schematic structural diagram of a bursting disc according to another embodiment of the utility model;

[0043] Figure 6 is a schematic structural diagram of a bursting disc according to another embodiment of the utility model;

[0044] Figure 7 is a schematic structural diagram of a bursting disc according to another embodiment of the utility model;

[0045] Figure 8 is a schematic structural diagram of a bursting disc according to another embodiment of the utility model;

[0046] Fig. 9 It is a schematic structural diagram of a single cell according to an embodiment of the utility model.

[0047] Reference numerals:

[0048] 100, bursting disc; 200, explosion-proof valve; 300, single battery;

[0049] 1. blasting body; 11. first notch; 111. first opening; 112. pressure relief opening section;

[0050] 113, first arc segment; 114, second arc segment; 115, first opening forming segment;

[0051] 116. a second opening forming section;

[0052] 12, second notch; 121, stress concentration section; 122, first reinforcement section;

[0053] 123, second reinforcement section; 124, second opening; 125, first transition arc section; 126, second transition arc;

[0054] 2. Explosion-proof body. DETAILED DESCRIPTION

[0055] Embodiments of the present invention are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0056] Reference below Figure 1-Figure 9The 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, while taking into account the connection strength at the first notch 11 and the pressure relief opening capability.

[0057] Combination Figure 1-Figure 9 As shown, according to the bursting disc 100 of the first embodiment of the utility model, the bursting disc 100 is provided with a first notch 11 and a second notch 12, the first notch 11 is shaped as a ring with a first opening 111, the second notch 12 is shaped as a ring with a second opening 124, the second notch 12 is surrounded by the first notch 11 and is spaced apart from the first notch 11, the area of ​​the area enclosed by the intersection of the two ends of the outer periphery of the first notch 11 is S1, the area of ​​the area enclosed by the two ends of the outer periphery of the second notch 12 is S2, and S1 and S2 satisfy the relationship: 10% S1≤S2≤90% S1. Among them, the ring can be any shape that can enclose a certain area, for example, it can also be a rectangle, waist, polygon, etc., but is not limited to this.

[0058] 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 beginning and the end. Compared with a complete circle of runway-shaped notches (no notch-free part 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 not connected at the beginning and the end, and is spaced from the first notch 11 surrounding its periphery, so that the second notch 12 and the first notch 11 or the second notch 12 itself form a closed contour, which can avoid the risk of part of the bursting disc 100 flying out directly during the detonation and pressure relief process.

[0059] 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) at the two ends of the outer peripheral edge of the first notch 11 (that is, the fractures at the two ends of the first notch 11) is S1, and the area enclosed by the straight lines directly connecting the two ends of the outer peripheral edge of the second notch 12 (that is, the fractures at the two ends of the second notch 12) and the second notch 12 is S2, and S1 and S2 satisfy the size relationship of 10% S1≤S2≤90% S1, so that S2 can be associated with S1 and maintained within a reasonable range, thereby avoiding excessive or too small blasting force when the blasting piece 100 is detonated, and taking into account the connection stability and pressure relief opening ability of the blasting piece 100.

[0060] Among them, 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, thereby causing the first notch 11 to reach the blasting force required for detonation prematurely, and accidental explosion and tearing occur on the first notch 11; compared with S2 > 90% 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.

[0061] For example, Figure 1 , Figure 5 , Figure 6 and Figure 8 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 straight lines (dashed lines) directly connecting the openings at both ends of the second notch 12 and the outer periphery of the original second notch 12; for example, Figure 7 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 original arc extension trend) and the original outer periphery of the first notch 11, and S2 is the area enclosed by the straight line (dotted line) directly connecting the openings at both ends of the second notch 12 and the original outer periphery of the second notch 12.

[0062] 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, and avoiding the risk of the first notch 11 being easily torn by accident and unable to burst and relieve pressure in time.

[0063] Preferably, S1 and S2 satisfy the relationship: 25% S1≤S2≤85% S1. Compared with S2<25% 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>85% 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.

[0064] According to some optional embodiments of the present invention, Figure 1 , Figure 5-Figure 8As shown, the second opening 124 is located on the side of the second notch 12 facing the first opening 111. Among them, the second opening 124 is in an open state facing the first opening 111. The position of the first opening 111 on the outer edge of the rupture disk 100 is equivalent to the fulcrum, and the position of the partial first notch 11 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 124 also further weakens the strength of this point, making it easier for the rupture disk 100 to burst from the position of the partial first notch 11 opposite the first opening 111.

[0065] Specifically, as Figure 1 , Figure 5-Figure 8 shown, the second notch 12 includes a stress concentration section 121, a first strengthening section 122, and a second strengthening section 123. One end of the first strengthening section 122 and one end of the second strengthening section 123 are respectively connected to both ends of the stress concentration section 121, and a second opening 124 is formed between the other end of the first strengthening section 122 and the other end of the second strengthening section 123; among them, the area of the region enclosed by the outer peripheral edge of the stress concentration section 121, the outer peripheral edge of the first strengthening section 122, and the outer peripheral edge of the second strengthening section 123 is S2. For example, the area of the region jointly enclosed by the outer peripheral edges of the first strengthening section 122, the stress concentration section 121, and the second strengthening section 123 connected in sequence and the straight line connected to the outer peripheral edge of the ports of the first strengthening section 122 and the second strengthening section 123 is S2.

[0066] It can be understood that during the bursting process of the rupture disk 100, the stress deformation is mainly concentrated at the stress concentration section 121, so it plays a role in stress concentration, and the first strengthening section 122 and the second strengthening section 123 play a strengthening role. When the rupture disk 100 is opened, due to the relationship that the structures of the first strengthening section 122, the stress concentration section 121, and the second strengthening section 123 are similar to the "U"-shaped second notch 12, the stress is mostly concentrated near the stress concentration section 121, which causes the stress concentration section 121 to deform first. When the deformation at the stress concentration section 121 reaches a certain height, tearing appears at the partial first notch 11 adjacent to the stress concentration section 121, and the crack spreads in two directions along the edge runway direction, and finally completely opens the rupture disk 100.

[0067] Among them, the strengthening effects of the first strengthening section 122 and the second strengthening section 123 ensure that the material between the stress concentration section 121 and the base material is not easily deformed by force, effectively reducing the deformation height of the rupture disk 100 at the middle and rear parts of the "U"-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 amount. Moreover, the "U"-shaped second notch 12 makes the force on the rupture disk 100 concentrated at the middle and rear parts of the "U" shape, while for the rupture disk 100 without the "U"-shaped second notch 12 in the middle, the stress is mostly concentrated in the middle of the rupture disk 100 and the stress is relatively dispersed, and the angle θ tends to 0, which leads to that during the blasting process, the tearing force F is close to 0, and this will require a higher detonation pressure to rupture the first notch 11.

[0068] Furthermore, as Figure 1 , Figure 5-Figure 8 shown, the first notch 11 includes a pressure relief opening section 112 disposed opposite to the first opening 111, and the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is less than the minimum distance between the stress concentration section 121 and the first opening 111.

[0069] It can be understood that a pressure relief opening section 112 is provided at the position corresponding to the first opening 111 on the first notch 11, 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 a 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 the weak point of strength, so that the rupture disk 100 is more likely to burst from the pressure relief opening section 112.

[0070] Among them, the stress concentration section 121 on the second notch 12 can change the stress concentration position of the rupture disk 100, that is, the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is less than the minimum distance between the stress concentration section 121 and the first opening 111. In this way, a part of the rupture disk 100 between the stress concentration section 121 and the pressure relief opening section 112 can quickly arch up when subjected to a small detonation air pressure, so as to tear the notch on the pressure relief opening section 112 at the outer edge detonation point earlier, and then extend the tearing path from the pressure relief opening section 112 to the first notches 11 on both sides of it. For example, when the rupture disk 100 is stressed, it quickly arches up from the notch at the stress concentration section 121 to form an angle with the outer edge detonation point (pressure relief opening section 112), so as to play a role in tearing the overall first notch 11.

[0071] In addition, compared with the structural form in the prior art where two semi-circular notches intersect at the middle position of the notch, the stress concentration section 121 in the embodiment of this case is closer to the first notch 11 at the outer edge. This is more conducive to initiating the first notch 11 at the outer edge, avoiding the problems that the bursting disc 100 is prone to initiate in the middle and has a small initiation area, thus facilitating the rapid pressure relief of the battery pack. Also, compared with a single "race track" notch structure (where the stress on the notch is too dispersed and not conducive to the rapid bursting and opening of the bursting disc 100), the embodiment in this case makes the opening part of the bursting disc 100 (i.e., the pressure relief opening section 112) more consistent, the initiation pressure more stable, and the required initiation pressure smaller, which is beneficial to battery pressure relief.

[0072] Specifically, 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: 1.5 mm ≥ d3 > 0. Among them, the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is less than 1.5 mm. In this way, it can be avoided that the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is too large. Thus, on the basis of ensuring the critical initiation pressure of the bursting disc 100, it can also play a role in changing the position of the initiation pressure on the first notch 11, reducing the effect of the required initiation pressure of the bursting disc 100, and further facilitating the rapid bursting of the bursting disc 100 for pressure relief. For example, d3 is 0.5 mm, 1 mm or 1.5 mm, and is not limited thereto.

[0073] Among them, as Figure 1 、 Figure 2 and Figure 4 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. 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 can be realized that the initiation occurs at a lower initiation pressure F. In the embodiment of this case, the second notch 12 similar to a "U" shape makes the force on the bursting disc 100 concentrated in the middle and rear part of the "U" shape. For the bursting disc 100 without the "U" - shaped second notch 12 in the middle, the stress is mostly concentrated in the middle of the bursting disc 100 and is relatively dispersed, and the angle θ tends to 0. This leads to a situation where during the bursting process, the tearing force F1 approaches 0, and a higher initiation pressure is required to break the first notch 11.

[0074] Furthermore, as Figure 1 、 Figure 7 and Figure 8As 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.

[0075] Specifically, Figure 1 , Figure 7 and Figure 8 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.

[0076] It is understandable that if Figure 1 and Figure 8 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.

[0077] Furthermore, if Figure 5 and Figure 6 As 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.

[0078] Specifically, Figure 5 and Figure 6 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.

[0079] Furthermore, if Figure 1 , Figure 5-Figure 8As shown, the first reinforcement section 122 and the second reinforcement section 123 are constructed as a straight line extending from the stress concentration section 121 to the first opening 111. It can be understood that the first reinforcement section 122 and the second reinforcement section 123 are 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.

[0080] Specifically, Figure 1 and Figure 8 As shown, the stress concentration section 121 is constructed in a straight line, and the stress concentration section 121 is arranged perpendicular to the first reinforcement section 122 and the second reinforcement section 123. The stress concentration section 121 is constructed in a straight line, which can ensure the accuracy and consistency of processing.

[0081] In addition, the stress concentration section 121 is vertically connected to the first reinforcement section 122 and the second reinforcement section 123 respectively. When the bursting piece 100 is subjected to gas pressure, the stress is concentrated in the stress concentration section 121. The first reinforcement section 122 and the second reinforcement section 123 strengthen 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 to tear.

[0082] Furthermore, if Figure 1 As shown, the second notch 12 also includes a first transition arc segment 125 and a second transition arc segment 126. The first transition arc segment 125 is connected between the first reinforcement segment 122 and the stress concentration segment 121, and the second transition arc segment 126 is connected between the second reinforcement segment 123 and the stress concentration segment 121. The area of ​​the region enclosed by the outer periphery of the stress concentration segment 121, the outer periphery of the first reinforcement segment 122, the outer periphery of the second reinforcement segment 123, the outer periphery of the first transition arc segment 125 and the outer periphery of the second transition arc segment 126 is S2.

[0083] For example, the area of ​​the region enclosed by the straight lines connecting the outer peripheries of the first reinforcement segment 122, the first transition arc segment 125, the stress concentration segment 121, the second transition arc segment 126 and the second reinforcement segment 123 in sequence and connecting the outer peripheries of the first reinforcement segment 122 and the second reinforcement segment 123 is S2.

[0084] It can be understood that the first transition arc segment 125 serves to evenly transition and connect the first reinforcement segment 122 and the stress concentration segment 121, thereby avoiding the formation of a stress concentration area at the connection between the first reinforcement segment 122 and the stress concentration segment 121, and the second transition arc segment 126 serves to evenly transition and connect the second reinforcement segment 123 and the stress concentration segment 121, thereby avoiding the formation of a stress concentration area at the connection between the second reinforcement segment 123 and the stress concentration segment 121, thereby ensuring the processing continuity of the one-piece molding of the second notch 12 on the one hand, and ensuring the effect that the first reinforcement segment 122 and the second reinforcement segment 123 do not interfere with the stress concentration segment 121 on the other hand.

[0085] Specifically, Figure 1 , Figure 5 , Figure 7 and Figure 8 As shown, the first reinforcement section 122 and the second reinforcement section 123 are arranged in parallel. It can be understood that the distance between the first reinforcement section 122 and the second reinforcement section 123 is equal everywhere, so as to ensure the consistency and accuracy of processing.

[0086] Furthermore, if Figure 6 As shown, the distance between the first reinforcement section 122 and the second reinforcement section 123 gradually increases in the direction toward the first opening 111. It can be understood that the first reinforcement section 122 and the second reinforcement section 123 are respectively connected to one end of the stress concentration section 121, and the distance between the first reinforcement section 122 and the second reinforcement section 123 increases in the direction toward the first opening 111, so that 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, and also increasing the area of ​​the reinforcement section for strengthening the structural rigidity of the bursting disc 100 between the stress concentration section 121 and the first opening 111, thereby improving the detonation reliability of the bursting disc 100.

[0087] Specifically, Figure 1 As shown, in the relative directions of the first reinforcement segment 122 and the second reinforcement segment 123, the maximum distance between the outer peripheries of the first notch 11 is d1, and the maximum distance between the outer peripheries of the first reinforcement segment 122 and the outer peripheries of the second reinforcement segment 123 is d2, and d1 and d2 satisfy the relationship: 25% d1≤d2≤85% d1.

[0088] It can be understood that, in the relative directions of the first reinforcement section 122 and the second reinforcement section 123 (such as the left and right directions in the figure), the maximum distance d1 between the outer edges of the first notch 11 and the maximum distance d2 between the outer edges of the first reinforcement section 122 and the second reinforcement section 123 satisfy the size relationship of 25% d1 ≤ d2 ≤ 85% d1, so that d1 and d2 can be associated and maintained within a reasonable range, thereby avoiding the blasting force of the bursting piece 100 being too large or too small, and thus taking into account the connection stability and pressure relief opening capability of the bursting piece 100.

[0089] 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 accidental explosion and tearing occur on the first notch 11; 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.

[0090] 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 S1 is S2=d2×(d4-R)+πR 2 / 2+(d2-2R)R, d4 is the sum of the radii of the first reinforcement section 122 and the first transition arc section 125, R is the radius of the first transition arc section 125 and the second transition arc section 126, R≥0.3mm. Such a design is not only easy to process, but also can ensure the consistency and accuracy of the pressure required for detonation.

[0091] According to some optional embodiments of the present invention, Figure 8 As shown, 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: 10% S1≤nS2≤90% S1, n≥2.

[0092] 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 relationship of 10% S1 ≤ nS2 ≤ 90% 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.

[0093] According to some optional embodiments of the present invention, Figure 1 As 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 and are parallel to the pressure relief opening segment 112. One end of an opening forming segment 115 is connected to one end of the first arc segment 113, one end of a second opening forming 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 opening forming segment 115 and the other end of the second opening forming segment 116; wherein, the area of ​​a 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.

[0094] For example, the area of ​​the region 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 extension lines of the outer peripheries of the first opening forming segment 115 and the second opening forming segment 116 is S2.

[0095] 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, the first 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 first 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 battery 300, 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.

[0096] Specifically, Figure 1 , Figure 5-Figure 8As 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 shape. In other words, the pressure relief opening section 112, the first opening forming section 115 and the second opening forming section 116 are configured in a straight line or an arc shape, which makes it easy to 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 makes it easier to ensure the processing and manufacturing of the first scoring 11 as an integrated molding.

[0097] According to some optional embodiments of the present invention, Figure 1 , Figure 5-Figure 8 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.

[0098] 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.

[0099] 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.

[0100] Combination Figure 1 and Fig. 9 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.

[0101] According to the single cell battery 300 of the third aspect embodiment of the utility model, the explosion-proof valve 200 of the above embodiment is included. Thus, the single cell battery 300 with the explosion-proof valve 200 can more quickly dissipate the internal high air pressure when it encounters a collision inside itself causing a concentrated air pressure explosion, thereby improving the safety of the single cell battery 300.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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, the first notch is shaped as a ring with a first opening, the second notch is shaped as a ring with a second opening, the second notch is surrounded by the first notch and is spaced apart from the first notch, the area of ​​the region enclosed by the intersection of the extended lines at both ends of the outer periphery of the first notch is S1, the area of ​​the region enclosed by the straight lines at both ends of the outer periphery of the second notch is S2, and S1 and S2 satisfy the relationship: 10% S1≤S2≤90% S1.

2. The bursting disc according to claim 1, characterized in that: S1 and S2 satisfy the relationship: 25% S1 ≤ S2 ≤ 85% 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: 10% S1≤nS2≤90% S1, n≥2.

4. 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.

5. The bursting disc according to claim 4, 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.

6. The bursting disc according to claim 4, 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.

7. The bursting disc according to claim 1, characterized in that: The second opening is located on a side of the second notch facing the first opening.

8. The bursting disc according to claim 7, characterized in that: The second notch comprises: Stress concentration section; a first reinforcement section and a second reinforcement section, wherein 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 the second opening is formed between the other end of the first reinforcement section and the other end of the second reinforcement section; The area of ​​a region enclosed by the outer periphery of the stress concentration segment, the outer periphery of the first reinforcement segment, and the outer periphery of the second reinforcement segment is S2.

9. The bursting disc according to claim 8, characterized in that: In the relative directions of the first reinforcement segment and the second reinforcement segment, the maximum distance between the outer peripheries of the first notch is d1, and the maximum distance between the outer peripheries of the first reinforcement segment and the outer peripheries of the second reinforcement segment is d2, and d1 and d2 satisfy the relationship: 25% d1≤d2≤85% d1.

10. The bursting disc according to claim 8, characterized in that The first notch includes a pressure relief opening segment disposed opposite to the first 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 first opening.

11. The bursting disc according to claim 10, characterized in that The minimum distance between the stress concentration section and the pressure relief opening section is d1, and d1 satisfies: 1.5 mm ≥ d3 > 0.

12. The bursting disc according to claim 10, 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.

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

15. The bursting disc according to claim 14, 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.

16. The bursting disc according to claim 8, characterized in that The first reinforcement section and the second reinforcement section are configured as straight lines extending from the stress concentration section toward the first opening.

17. The bursting disc according to claim 16, characterized in that The stress concentration section is configured in a straight line and is disposed perpendicularly to the first reinforcement section and the second reinforcement section.

18. The bursting disc according to claim 17, characterized in that The second notch also includes: A first transition arc segment, wherein the first transition arc segment is connected to the first reinforcement segment and the stress concentration segment; A second transition arc segment, wherein the second transition arc segment is connected between the second reinforcement segment and the stress concentration segment; The area of ​​a region enclosed by the outer periphery of the stress concentration segment, the outer periphery of the first reinforcement segment, the outer periphery of the second reinforcement segment, the outer periphery of the first transition arc segment, and the outer periphery of the second transition arc segment is S2.

19. The bursting disc according to claim 8, characterized in that The first reinforcement section and the second reinforcement section are arranged in parallel.

20. The bursting disc according to claim 8, characterized in that The distance between the first reinforcement section and the second reinforcement section gradually increases in a direction toward the opening.

21. 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 and an extension line of the second opening forming section coincide with each other and are 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 first opening is formed between the other ends of the first opening forming section and the other ends of 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.

22. The bursting disc according to claim 21, 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.

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

24. An explosion-proof valve, characterized in that: include: A bursting disc as claimed in any one of claims 1 to 23.

25. A single cell battery, characterized in that: include: The explosion-proof valve according to claim 24.

26. A battery pack, characterized in that: include: A plurality of single cells as claimed in claim 25.

27. An electric energy device, characterized in that: include: The device body and the battery pack as claimed in claim 26.

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