Rupture disc, explosion-proof valve, battery cell, battery pack, and electrical device

Abstract

The present application discloses a rupture disc, an explosion-proof valve, a battery cell, a battery pack, and an electrical device. The rupture disc is provided with a first notch and a second notch; the shape of the first notch is configured in an annular shape having a first opening; two opposite endpoints of the first notch are configured as two opposite ends of the first opening; the first notch comprises a pressure-relief activation section arranged opposite to the first opening; the second notch is at least partially surrounded by the first notch and a line connecting the two opposite endpoints and is spaced apart from the first notch; the second notch comprises a stress concentration section; the minimum distance between the stress concentration section and the pressure-relief activation section is less than the minimum distance between the stress concentration section and the first opening.

Description

rupture discs, explosion-proof valves, individual batteries, battery packs, and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202421519496.9, filed on June 28, 2024, entitled "Rupture Disc, Explosion-proof Valve, Single Cell Battery, Battery Pack and Power Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a rupture disc, an explosion-proof valve, a single cell, a battery pack, and an electrical power device. Background Technology

[0003] Batteries are designed in various shapes to meet different production and daily life needs. Regardless of the shape, the market demand for safety is constantly increasing, making improved battery safety a long-term goal for battery manufacturers. The rupture disc is a crucial component for ensuring battery safety. When the internal pressure of the battery exceeds a safety threshold, the timely pressure relief by the rupture disc is critical. Therefore, the stability of the rupture disc's burst is a very important factor in ensuring battery safety. When the high pressure inside the battery reaches the rupture disc's threshold, the disc bursts, releasing pressure and significantly reducing the risk of battery explosion.

[0004] In related technologies, elliptical battery rupture discs are generally provided with a ring of "racetrack-shaped" grooves. Although the rupture disc structure with this groove structure is simple, the stress of this groove structure is too dispersed, which is not conducive to the rapid detonation of the rupture disc. Summary of the Invention

[0005] This application aims to address at least one of the technical problems existing in the prior art. To this end, one object of this application is to provide a rupture disc that allows the rupture disc to open more easily from the edge, release pressure more quickly, and requires less initiation pressure.

[0006] This application further proposes an explosion-proof valve.

[0007] This application further proposes a single-cell battery.

[0008] This application further proposes a battery pack.

[0009] This application further proposes an electrical power device.

[0010] According to the first aspect of this application, the rupture disc has a first notch and a second notch. The first notch is shaped as an annular ring with a first opening, and the opposite two ends of the first notch form the opposite ends of the first opening. The first notch includes a pressure relief opening section disposed opposite to the first opening. The second notch is at least partially surrounded by a connecting line between the first notch and the opposite two ends, and the second notch is spaced apart from the first notch. The second notch includes a stress concentration section, and the minimum distance between the stress concentration section and the pressure relief opening section is less than the minimum distance between the stress concentration section and the first opening.

[0011] Therefore, the stress concentration section on the second notch can change the stress concentration position of the rupture disc. That is, the minimum distance between the stress concentration section and the pressure relief opening section is smaller than the minimum distance between the stress concentration section and the first opening. This allows the portion of the rupture disc between the stress concentration section and the pressure relief opening section to quickly arch up under a smaller initiation pressure, thus tearing the notch on the pressure relief opening section at the outer detonation point earlier. This then extends the tearing path from the pressure relief opening section towards the first notches on both sides. In summary, by designing this rupture disc, it is easier for the disc to open from the edge, resulting in faster pressure relief and a lower required initiation pressure.

[0012] In some examples of this application, the pressure relief opening section and the stress concentration section are arranged in parallel.

[0013] In some examples of this application, the pressure relief opening section and the stress concentration section are constructed as parallel straight lines; or the pressure relief opening section and the stress concentration section are constructed as parallel arcs.

[0014] In some examples of this application, one of the pressure relief opening section and the stress concentration section is configured as an arc shape and the other is configured as a straight line.

[0015] In some examples of this application, the pressure relief opening section is constructed as a straight line, and the stress concentration section is constructed as an arc shape protruding toward the pressure relief opening section.

[0016] In some examples of this application, the second notch further includes a reinforcing section connected to the stress concentration section and located on the side of the stress concentration section facing the first opening.

[0017] In some examples of this application, the reinforcing section is constructed as a straight line extending from the stress concentration section toward the first opening.

[0018] In some examples of this application, the reinforcing segment is connected between the two ends of the stress concentration segment.

[0019] In some examples of this application, the reinforcing segment is connected at the center of the stress concentration segment.

[0020] In some examples of this application, the stress concentration section is constructed as a straight line and is arranged perpendicular to the reinforcement section.

[0021] In some examples of this application, the reinforcing segment is connected to the end of the stress concentration segment.

[0022] In some examples of this application, the second notch further includes a transition arc segment connecting the reinforcing segment and the stress concentration segment.

[0023] In some examples of this application, the reinforcing segment is at least two and includes: a first reinforcing segment and a second reinforcing segment, one end of the first reinforcing segment and one end of the second reinforcing segment are respectively connected to the two ends of the stress concentration segment, and a second opening is formed between the other ends of the first reinforcing segment and the other ends of the second reinforcing segment.

[0024] In some examples of this application, the distance between the first reinforcing segment and the second reinforcing segment gradually increases in the direction toward the opening.

[0025] In some examples of this application, the first reinforcing segment and the second reinforcing segment are arranged in parallel.

[0026] In some examples of this application, the minimum distance between the stress concentration section and the pressure relief opening section is d1, where d1 satisfies: d1 > 1 mm.

[0027] In some examples of this application, the first notch further includes: a first arc segment and a second arc segment, the first arc segment and the second arc segment being disposed opposite each other and protruding in a direction away from each other; a pressure relief opening segment, the pressure relief opening segment being constructed in a straight line shape, the two ends of the pressure relief opening segment being connected to one end of the first arc segment and one end of the second arc segment, respectively; a first straight line segment and a second straight line segment, the extension lines of the first straight line segment and the extension lines of the second straight line segment coinciding and parallel to the pressure relief opening segment, one end of the first straight line segment being connected to one end of the first arc segment, one end of the second straight line segment being connected to one end of the second arc segment, and the first opening being formed between the other ends of the first straight line segment and the other ends of the second straight line segment.

[0028] In some examples of this application, the rupture disc includes: a connecting substrate; a rupture body, the connecting substrate being disposed around the rupture body, and the first notch and the second notch being disposed on the rupture body; wherein the thickness of the connecting substrate is H1, the thickness of the rupture body is H2, the thickness of the first notch is H3, the thickness of the second notch is H4, and H1, H2, H3, and H4 satisfy: H1 > H2 > H4 > H3.

[0029] In some examples of this application, the thickness of the second notch is the same at all locations.

[0030] The explosion-proof valve according to the second aspect of this application includes: the aforementioned rupture disc.

[0031] The single-cell battery according to the third aspect of this application includes: the explosion-proof valve described above.

[0032] The battery pack according to the fourth aspect of this application includes: a plurality of the aforementioned individual battery cells.

[0033] The electrical equipment according to the fifth aspect of this application includes: the equipment body and the aforementioned battery pack.

[0034] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0035] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0036] Figure 1 is a schematic diagram of the structure of a rupture disc according to an embodiment of this application;

[0037] Figure 2 is a cross-sectional view along the AA direction in Figure 1;

[0038] Figure 3 is an enlarged view of region C in Figure 2;

[0039] Figure 4 is a force analysis diagram of the rupture disc in the BB direction of Figure 1 during the detonation process;

[0040] Figure 5 is a schematic diagram of the structure of a rupture disc according to another embodiment of the present invention;

[0041] Figure 6 is a structural schematic diagram of a rupture disc according to another embodiment of the present invention;

[0042] Figure 7 is a structural schematic diagram of a rupture disc according to another embodiment of the present invention;

[0043] Figure 8 is a structural schematic diagram of a rupture disc according to another embodiment of the present invention;

[0044] Figure 9 is a structural schematic diagram of a rupture disc according to another embodiment of the present invention;

[0045] Figure 10 is a structural schematic diagram of a rupture disc according to another embodiment of the present invention;

[0046] Figure 11 is a structural schematic diagram of a single battery according to an embodiment of the present invention;

[0047] Figure 12 is a schematic diagram of the structure of a battery pack according to an embodiment of this application;

[0048] Figure 13 is a schematic diagram of the structure of an electrical power device provided according to an embodiment of this application.

[0049] Reference numerals: 100, rupture disc; 200, explosion-proof valve; 300, single cell battery; 400, battery pack; 500, electrical equipment; 600, equipment body; 1, rupture body; 11, first notch; 111, first opening; 112, pressure relief opening section; 113, first arc section; 114, second arc section; 115, first straight section; 116, second straight section; 117, first end point; 118, second end point; 119, connecting line; 12, second notch; 121, stress concentration section; 122, first reinforcing section; 123, second reinforcing section; 124, second opening; 125, first transition arc section; 126, second transition arc; 2, explosion-proof body. Detailed Implementation

[0050] The embodiments of this application are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0051] The following description, with reference to Figures 1-11, describes a rupture disc 100 according to an embodiment of this application, which allows the rupture disc 100 to open more easily from the edge, release pressure more quickly, and requires less detonation pressure.

[0052] Referring to Figures 1-11, the rupture disc 100 according to the first aspect embodiment of this application is provided with a first notch 11 and a second notch 12. The first notch 11 is shaped as an annulus with a first opening 111. The opposite two ends of the first notch 11 (the first end 117 and the second end 118 as shown in Figure 1) are configured as the opposite two ends of the first opening 111. The first notch 11 includes a pressure relief opening section 112 disposed opposite to the first opening 111. The second notch 12 is at least partially surrounded by a connecting line 119 (as shown in Figure 1) connecting the first notch 11 and the opposite two ends (the first end 117 and the second end 118 as shown in Figure 1). Moreover, the second notch 12 is spaced apart from the first notch 11. The second notch 12 includes a stress concentration section 121. The minimum distance between the stress concentration section 121 and the pressure relief opening section 112 (as shown in Figure 1, d1) is less than the minimum distance between the stress concentration section 121 and the first opening 111 (as shown in Figure 1, d2).

[0053] Specifically, the rupture disc 100 has a first notch 11 formed along its circumferential direction, and the first notch 11 is not connected at its beginning and end, that is, the first notch 11 has two opposite ends with no notch between them, so that the shape of the first notch 11 is configured as a ring with a first opening 111. Compared with a complete racetrack-shaped notch (without a notched part connected to the substrate), this can avoid the risk of the rupture disc 100 flying out during the detonation and depressurization process, which could cause a short circuit in the battery, thereby improving safety.

[0054] 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 of the pressure relief opening section 112 is weaker than that of the first opening 111. At this time, the position of the first opening 111 is equivalent to the fulcrum, and the position of the pressure relief opening section 112 opposite the first opening 111 is equivalent to the point farthest from the fulcrum. According to the lever theorem, the farthest point is the weakest point, which makes it easier for the rupture disc 100 to explode from the pressure relief opening section 112.

[0055] Furthermore, as shown in Figures 1-4, the first notch 11 surrounds the outside of the second notch 12, and the second notch 12 and the first notch 11 are spaced apart. This avoids the risk that the first notch 11 and the second notch 12 form a closed outline, which would cause some of the rupture fragments 100 to fly out directly during the detonation and depressurization process.

[0056] In detail, as shown in Figures 1 and 4, the stress concentration section 121 on the second notch 12 can change the stress concentration position of the rupture disc 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. This allows the portion of the rupture disc 100 between the stress concentration section 121 and the pressure relief opening section 112 to quickly arch up when subjected to a smaller detonation pressure, thereby tearing the notch on the pressure relief opening section 112 at the outer detonation point earlier. This extends the tearing path from the pressure relief opening section 112 to the first notches 11 on both sides. For example, when the rupture disc 100 is under stress, it quickly arches up from the notch at the stress concentration section 121 to form an angle with the outer detonation point (pressure relief opening section 112), thus tearing the entire second notch 12.

[0057] Furthermore, compared to the existing technology that uses two semi-circular notches intersecting at the middle of the notches, the stress concentration section 121 in this embodiment is closer to the first notch 11 at the outer edge. This is more conducive to the detonation of the first notch 11 at the outer edge, avoiding the problem that the rupture disc 100 is prone to detonation in the middle and the detonation area is small, thus facilitating the rapid depressurization of the battery pack. Moreover, compared to a single ring of "racetrack-shaped" notch structure (where the stress on the notch is too dispersed, which is not conducive to the rapid detonation of the rupture disc), the embodiment in this case makes the opening part of the rupture disc 100 (that is, the depressurization opening section 112) more consistent, the detonation pressure more stable, and the required detonation pressure lower, which is beneficial to the depressurization of the battery.

[0058] Therefore, by setting this rupture disc 100, it is easier for the rupture disc 100 to open from the edge, the pressure relief is faster, and the required detonation pressure is smaller.

[0059] According to some optional embodiments of this application, as shown in Figures 1, 5, and 8-10, 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 at all points. This avoids the risk of excessive stress concentration at a single point, which could easily cause the rupture disc 100 to detonate accidentally, thus reserving a certain safety buffer zone for the detonation pressure of the rupture disc 100.

[0060] Specifically, as shown in Figures 1, 5, and 10, the pressure relief opening section 112 and the stress concentration section 121 are constructed as parallel straight lines; or as parallel arcs. It can be understood that when both the pressure relief opening section 112 and the stress concentration section 121 are straight lines, they are parallel to each other, which makes it easier to ensure consistency in processing. Furthermore, since the pressure relief opening section 112 and the stress concentration section 121 uniformly weaken the structural strength of the upper edge of the area of ​​the rupture disc 100 sandwiched between them, this can, on the one hand, change the stress concentration position of the rupture disc 100, and on the other hand, improve the consistency and stability of crack propagation on the first notch 11 when the rupture disc 100 detonates.

[0061] According to some optional embodiments of this application, as shown in Figures 6 and 7, one of the pressure relief opening section 112 and the stress concentration section 121 is constructed in an arc shape, and the other of the pressure relief opening section 112 and the stress concentration section 121 is constructed in a straight line. For example, the stress concentration section 121 is constructed in a straight line and the pressure relief opening section 112 is constructed in an arc shape. This makes the stress concentration area smaller, so that the stress can be concentrated more quickly on the rupture disc 100 between the two, which can make the rupture disc 100 achieve a faster detonation velocity and improve the detonation sensitivity of the rupture disc 100.

[0062] Specifically, as shown in Figure 7, the pressure relief opening section 112 is constructed as a straight line, and the stress concentration section 121 is constructed as an arc protruding towards the pressure relief opening section 112. It can be understood that the straight construction of the pressure relief opening section 112 and the arc construction of the stress concentration section 121 result in a smaller stress concentration area, thereby reducing the initiation stress required for the rupture disc 100 and achieving a faster initiation and pressure relief speed.

[0063] According to some optional embodiments of this application, as shown in Figures 1 and 5-10, the second notch 12 further includes a reinforcing section 122, which is connected to the stress concentration section 121 and is located on the side of the stress concentration section 121 facing the first opening 111. Specifically, the reinforcing section 122 extends towards the first opening 111, thus ensuring that the material between the stress concentration section 121 and the first notch 11, except for the pressure relief opening section 112, is not easily deformed under stress. This effectively reduces the deformation height of the rupture disc 100 near the stress concentration section 121, thereby allowing the pressure relief opening section 112 on the first notch 11 to tear without requiring a large amount of deformation.

[0064] Specifically, as shown in Figures 1 and 5-10, the reinforcing section 122 is constructed as a straight line extending from the stress concentration section 121 towards the first opening 111. It can be understood that the straight-line construction of the reinforcing section 122 increases the spatial mode between the stress concentration section 121 and the first opening 111. This reduces the initiation force required for the rupture disc 100 to detonate between the stress concentration section 121 and the pressure relief opening section 112, and also concentrates the pressure more in the area between the stress concentration section 121 and the pressure relief opening section 112, thereby improving the rapid initiation of the rupture disc 100.

[0065] Furthermore, as shown in Figures 5 and 9, the reinforcing section 122 is connected between the two ends of the stress concentration section 121. One end of the reinforcing section 122 is connected between the two ends of the stress concentration section 121, and the other end extends towards the first opening 111. This strengthens the bending and torsional stiffness of the rupture disc 100 in the direction perpendicular to the stress concentration section 121, making it less prone to deformation in that direction. It also reduces the number of notches, thus reducing workload.

[0066] Specifically, as shown in Figures 5 and 9, the reinforcing section 122 is connected to the center of the stress concentration section 121. It can be understood that one end of the reinforcing section 122 is connected to the center of the stress concentration section 121, and the other end extends toward the first opening 111. This can uniformly increase the bending and torsional stiffness of the rupture discs 100 on both sides of the center of the stress concentration section 121, thereby improving the consistency and uniformity of crack tearing on the first notch 11.

[0067] Furthermore, as shown in Figures 1, 5, and 10, the stress concentration section 121 is constructed as a straight line, and it is perpendicular to the reinforcing section 122. The straight line construction of the stress concentration section 121 ensures the accuracy and consistency of the manufacturing process. In addition, the stress concentration section 121 and the reinforcing section 122 are connected perpendicularly. When the rupture disc 100 is subjected to air pressure, the stress concentrates at the stress concentration section 121. The reinforcing section 122 strengthens the bending and torsional stiffness of the rupture disc 100 in the direction perpendicular to the stress concentration section 121, thus making it less prone to deformation in this direction. This effectively reduces the deformation height of the rupture disc 100 near the stress concentration section 121, allowing the pressure relief opening section 112 to tear without requiring a large amount of deformation.

[0068] Specifically, as shown in Figures 1, 6-8, and 10, the reinforcing section 122 is connected to the end of the stress concentration section 121. One end of the reinforcing section 122 is connected to the center of the stress concentration section 121, and the other end extends toward the first opening 111. This strengthens the bending and torsional stiffness of the rupture disc 100 in the direction perpendicular to the stress concentration section 121, making it less prone to deformation in this direction. This effectively reduces the deformation height required for the rupture disc 100 to detonate near the stress concentration section 121, thereby improving the detonation sensitivity of the rupture disc 100.

[0069] Furthermore, as shown in Figures 1 and 10, the second notch 12 also includes a transition arc segment 123, which connects the reinforcing segment 122 and the stress concentration segment 121. It can be understood that the transition arc segment 123 serves to uniformly connect the reinforcing segment 122 and the stress concentration segment 121, preventing the formation of a stress concentration area at the connection point. This ensures both the continuity of the integral forming process of the second notch 12 and prevents the reinforcing segment 122 and the stress concentration segment 121 from interfering with each other.

[0070] Specifically, as shown in Figures 1 and 10, there are at least two reinforcing segments 122, including a first reinforcing segment 1221 and a second reinforcing segment 1222. One end of the first reinforcing segment 1221 and one end of the second reinforcing segment 1222 are respectively connected to the two ends of the stress concentration segment 121. A second opening 1223 is formed between the other end of the first reinforcing segment 1221 and the other end of the second reinforcing segment 1222.

[0071] Understandably, during the detonation of the rupture disc 100, the stress concentration section 121 acts as a stress concentration point, while the reinforcing section 122 acts as a reinforcement point. Stress deformation is primarily concentrated at the stress concentration section 121, while the pressure relief opening section 112 is mainly subjected to a tearing force, which is the primary reason why it opens first. When the rupture disc 100 opens, the stress concentration section 121 and the reinforcing section 122 have a U-shaped groove-like structure, causing stress to concentrate near the stress concentration section 121. This results in deformation occurring first at the stress concentration section 121. When the deformation at the stress concentration section 121 reaches a certain height, tearing occurs at the pressure relief opening section 112, and the crack extends in two directions along the edge runway, eventually completely opening the rupture disc 100.

[0072] The reinforcing function of the reinforcing section 122 ensures that the material between the stress concentration section 121 and the substrate is not easily deformed under stress, effectively reducing the deformation height of the lower part of the "U"-shaped rupture disc 100, so that tearing does not require a large amount of deformation at the notch 3. Furthermore, the "U"-shaped notch concentrates the stress on the lower part of the rupture disc 100, while the stress of the rupture disc 100 without the "U"-shaped notch in the middle is mostly concentrated in the middle of the rupture disc 100 and is more dispersed, and the angle θ tends to be 0. This results in the tearing force F1 being close to 0 during the explosion process, requiring a higher initiation pressure to break the notch.

[0073] Furthermore, in this embodiment, the direction of the second opening 1223 is consistent with the direction of the first opening 111 on the outer edge. The position of the first opening 111 on the outer edge is equivalent to a fulcrum, and the marked position opposite the first opening 111 (pressure relief opening section 112) is equivalent to the point farthest from the fulcrum. According to the lever theorem, the farthest point is the weakest point. The setting of the second opening 1223 further weakens the strength of this point, making it easier for the rupture disc 100 to explode from the pressure relief opening section 112.

[0074] Optionally, the first notch 11 is surrounded by a plurality of second notches 12 in the shape of "U". Such a combination of multiple similar second notches 12 can also achieve the effect of low detonation pressure and fast detonation speed.

[0075] Furthermore, as shown in Figure 7, the distance between the first reinforcing segment 1221 and the second reinforcing segment 1222 gradually increases in the direction toward the first opening 111. It can be understood that the first reinforcing segment 1221 and the second reinforcing segment 1222 are respectively connected to one end of the stress concentration segment 121, and the distance between the first reinforcing segment 1221 and the second reinforcing segment 1222 increases in the direction toward the first opening 111. This allows for the decomposition of extension paths parallel to the stress concentration segment 121 and perpendicular to the stress concentration segment 121, thereby further enhancing the stress concentration effect of the stress concentration segment 121. It also increases the area of ​​the reinforcing segment 122 that strengthens the structural stiffness of the rupture disc 100 between the stress concentration segment 121 and the first opening 111, thereby improving the detonation reliability of the rupture disc 100.

[0076] Specifically, as shown in Figures 1 and 6, the first reinforcing segment 1221 and the second reinforcing segment 1222 are arranged in parallel. It can be understood that the distance between the first reinforcing segment 1221 and the second reinforcing segment 1222 is equal everywhere, thus ensuring consistency and precision in processing.

[0077] According to some optional embodiments of this application, as shown in FIG1, the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is d1, where d1 > 1 mm. The minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is greater than 1 mm. This ensures the critical pressure of the rupture disc 100 while also concentrating the detonation pressure on the first notch 11, reducing the required detonation pressure for the rupture disc 100, thus facilitating rapid detonation and pressure relief. For example, d1 can be 1.5 mm, 2 mm, or 3 mm, and is not limited to these values.

[0078] In detail, the closer the stress concentration section 121 is to the pressure relief opening section 112, the larger the material deformation angle θ between the stress concentration section 121 and the pressure relief opening section 112. The relationship between the tearing force F1 and the vertical force F generated by the air pressure is Fsinθ=F1. Therefore, the larger the angle θ, the larger the tearing force F1, so it is possible to achieve detonation at a lower initiation pressure F. In this embodiment, the U-shaped notch causes the force on the rupture disc 100 to concentrate in the lower part of the U-shape. However, for rupture discs 100 without U-shaped notches in the middle, the stress is mostly concentrated in the middle of the rupture disc 100 and the stress is more dispersed. Moreover, the angle θ tends to be 0. This results in the tearing force F1 being close to 0 during the detonation process, requiring a higher initiation pressure to break the notch.

[0079] According to some optional embodiments of this application, as shown in FIG1, the first notch 11 further includes a first arc segment 113, a second arc segment 114, a pressure relief opening segment 112, a first straight segment 115, and a second straight segment 116. The first arc segment 113 and the second arc segment 114 are arranged opposite to each other, and the first arc segment 113 and the second arc segment 114 protrude in a direction away from each other. The pressure relief opening segment 112 is constructed as a straight line, and the two ends of the pressure relief opening segment 112 are respectively connected to one end of the first arc segment 113 and the first arc segment 114. One end of the two arc segments 114 is connected, the extension line of the first straight segment 115 coincides with the extension line of the second straight segment 116, and the extension lines of the first straight segment 115 and the second straight segment 116 are parallel to the pressure relief opening section 112. One end of the first straight segment 115 is connected to one end of the first arc segment 113, one end of the second straight segment 116 is connected to one end of the second arc segment 114, and the other end of the first straight segment 115 and the other end of the second straight segment 116 form a first opening 111.

[0080] In detail, the first straight segment 115, the first arc segment 113, the pressure relief opening segment 112, the second arc segment 114, and the second straight segment 116 are connected sequentially. The extension line of the first straight segment 115 coincides with the extension line of the second straight segment 116. A first opening 111 is formed between the other end of the first straight segment 115 and the other end of the second straight segment 116. The first arc segment 113 and the second arc segment 114 protrude in a direction away from each other. That is, the overall structure of the first notch 11 is similar to a runway shape with the first opening 111. This notch structure is simpler, does not affect the critical pressure of the rupture disc 100, can meet the explosion-proof strength requirements of the single cell 300, can ensure the basic pressure relief function, and can prevent the risk of the rupture disc 100 flying out during the detonation process.

[0081] According to some optional embodiments of this application, as shown in Figures 1 and 5-7, the rupture disc 100 includes a connecting substrate 2 and a rupture body 1. The connecting substrate 2 is disposed around the rupture body 1, and a first notch 11 and a second notch 12 are disposed on the rupture body 1. The thickness of the connecting substrate 2 is H1, the thickness of the rupture body 1 is H2, the thickness of the first notch 11 is H3, and the thickness of the second notch 12 is H4. H1, H2, H3, and H4 satisfy the following order: H1 > H2 > H4 > H3. The thicknesses of the first notch 11 and the second notch 12 refer to the remaining thickness of the connecting substrate 2 after the notch 11 and the second notch 12 form the groove.

[0082] Specifically, this thickness distribution ensures that the second notch 12 alters the stress concentration position on the rupture disc 100 without causing it to burst before the detonation zone (pressure relief opening section 112). This means the rupture disc 100 can precisely burst at the pressure relief opening section 112, preventing insufficient pressure relief area caused by bursting at the second notch 12, thus ensuring the consistency and accuracy of the pressure required for the rupture disc 100 to detonate. Furthermore, the thickness of the connecting substrate 2 is greater than the thickness of the rupture body 1, which also ensures the strength of the welded area of ​​the substrate of the rupture disc 100.

[0083] According to some optional embodiments of this application, as shown in Figures 1-4, the thickness of the second notch 12 is the same at all points. This ensures the consistency and accuracy of the processing of the second notch 12, and makes the stress on the second notch 12 more uniform, thereby ensuring the consistency of the detonation pressure of the rupture disc 100.

[0084] Optionally, the stress concentration section 121 and the reinforcing section 122 are perpendicular to each other, and the connection is made with a rounded corner for easy processing. The relationship between the length C1 of the second notch 12 and the length B1 of the stress concentration section 121 must satisfy B1+d1<C1 and d1≥1mm. The relationship between the width D1 of the second notch 12 and the length A1 of the reinforcing section 122 must satisfy D1>A1. This can avoid the problem of excessive or insufficient detonation pressure and keep the critical detonation pressure within a suitable range.

[0085] As shown in Figure 11, the explosion-proof valve 200 according to the second aspect of this application includes the rupture disc 100 of the above embodiment. Thus, the explosion-proof valve 200 with the rupture disc 100 can reduce the initiation pressure required for explosion and increase the pressure relief speed.

[0086] As shown in Figure 11, the single cell battery 300 according to the third aspect embodiment of this application includes the explosion-proof valve 200 of the above embodiment. Thus, the single cell battery 300 with the explosion-proof valve 200 can more quickly dissipate the high internal pressure in the event of a collision that causes a concentrated explosion, thereby improving the safety of the single cell battery 300.

[0087] As shown in Figure 12, the battery pack 400 according to the fourth aspect of this application includes a plurality of individual battery cells 300 of the above embodiments. Thus, the battery pack 400 having the individual battery cells 300 can quickly and timely depressurize the battery pack under sudden high voltage conditions, thereby improving the safety of the battery pack 400.

[0088] As shown in Figure 13, the power device 500 according to a fifth aspect embodiment of this application includes a device body 600 and a battery pack 400 as described in the above embodiment. The power device 500 can be a vehicle, aircraft, ship, energy storage device, or household appliance, etc. Devices such as vehicles equipped with this battery pack 400 can improve their safety and ensure user safety.

[0089] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0090] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0091] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0092] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A rupture disc (100), wherein, The rupture disc (100) is provided with a first notch (11) and a second notch (12). The first notch (11) is shaped as an annulus with a first opening (111). The opposite two ends of the first notch (11) form the opposite two ends of the first opening (111). The first notch (11) includes a pressure relief opening section (112) disposed opposite to the first opening (111). The second notch (12) is at least partially surrounded by the connecting line between the first notch (11) and the opposite two ends, and the second notch (12) is spaced apart from the first notch (11). The second notch (12) includes a stress concentration section (121). The minimum distance between the stress concentration section (121) and the pressure relief opening section (112) is less than the minimum distance between the stress concentration section (121) and the first opening (111).

2. The rupture disc (100) according to claim 1, wherein, The pressure relief opening section (112) and the stress concentration section (121) are arranged in parallel.

3. The rupture disc (100) according to claim 2, wherein, The pressure relief opening section (112) and the stress concentration section (121) are constructed as parallel straight lines; or The pressure relief opening section (112) and the stress concentration section (121) are constructed as parallel arc shapes.

4. The rupture disc (100) according to claim 1, wherein, One of the pressure relief opening section (112) and the stress concentration section (121) is constructed in an arc shape and the other is constructed in a straight shape.

5. The rupture disc (100) according to claim 4, wherein, 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).

6. The rupture disc (100) according to any one of claims 1-5, wherein, The second notch (12) also includes: A reinforcing section (122) is connected to the stress concentration section (121) and is located on the side of the stress concentration section (121) facing the first opening (111).

7. The rupture disc (100) according to claim 6, wherein, The reinforcing section (122) is constructed as a straight line extending from the stress concentration section (121) toward the first opening (111).

8. The rupture disc (100) according to claim 6 or 7, wherein, The reinforcing section (122) is connected between the two ends of the stress concentration section (121).

9. The rupture disc (100) according to claim 8, wherein, The reinforcing section (122) is connected to the center of the stress concentration section (121).

10. The rupture disc (100) according to any one of claims 7-9, wherein, The stress concentration section (121) is constructed in a straight line and is arranged perpendicular to the reinforcing section (122).

11. The rupture disc (100) according to claim 7, wherein, The reinforcing section (122) is connected to the end of the stress concentration section (121).

12. The rupture disc (100) according to any one of claims 6-11, wherein, The second notch (12) also includes: A transition arc segment (123) connects the reinforcing segment (122) and the stress concentration segment (121).

13. The rupture disc (100) according to claim 7, wherein, The reinforcing segment (122) is at least two and includes: The first reinforcing section (1221) and the second reinforcing section (1222) are respectively connected at one end of the first reinforcing section (1221) and one end of the second reinforcing section (1222) to the two ends of the stress concentration section (121), and a second opening (1223) is formed between the other end of the first reinforcing section (1221) and the other end of the second reinforcing section (1222).

14. The rupture disc (100) according to claim 13, wherein, The distance between the first reinforcing segment (1221) and the second reinforcing segment (1222) gradually increases in the direction toward the first opening (111).

15. The rupture disc (100) according to claim 13, wherein, The first reinforcing segment (1221) and the second reinforcing segment (1222) are arranged in parallel.

16. The rupture disc (100) according to any one of claims 1-15, wherein, The minimum distance between the stress concentration section (121) and the pressure relief opening section (112) is d1, and d1 satisfies: d1 > 1 mm.

17. The rupture disc (100) according to any one of claims 1-16, wherein, The first notch (11) also includes: 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; The pressure relief opening section (112) is constructed in a straight line shape, and the two ends of the pressure relief opening section (112) are respectively connected to one end of the first arc segment (113) and one end of the second arc segment (114); The first straight segment (115) and the second straight segment (116) are connected. The extensions of the first straight segment (115) and the second straight segment (116) coincide and are parallel to the pressure relief opening section (112). One end of the first straight segment (115) is connected to one end of the first arc segment (113), and one end of the second straight segment (116) is connected to one end of the second arc segment (114). The first opening (111) is formed between the other end of the first straight segment (115) and the other end of the second straight segment (116).

18. The rupture disc (100) according to claim 1, wherein, The rupture disc (100) includes: Connecting substrate (2); The blasting body (1) is surrounded by the connecting base (2), and the first groove (11) and the second groove (12) are provided on the blasting body (1). The thickness of the connecting substrate (2) is H1, the thickness of the blasting body (1) is H2, the thickness of the first notch (11) is H3, and the thickness of the second notch (12) is H4. H1, H2, H3 and H4 satisfy: H1 > H2 > H4 > H3.

19. The rupture disc (100) according to any one of claims 1-18, wherein, The thickness of the second notch (12) is the same at all points.

20. An explosion-proof valve (200), wherein, include: The rupture disc (100) according to any one of claims 1-19.

21. A single-cell battery (300), wherein, include: The explosion-proof valve (200) according to claim 20.

22. A battery pack (400), wherein, include: The single cell (300) as described in multiple claims 21.

23. An electrical energy device (500), wherein, include: The device body (600) and the battery pack (400) as described in claim 22.

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