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

Abstract

A rupture disc (100), an explosion-proof valve (200), a battery cell (300), a battery pack (400), and an electrical energy device (500). The rupture disc (100) is provided with a first score (11) and a second score (12), and the second score (12) is surrounded by the first score (11). The first score (11) is configured to be in an annular shape having an opening (111), and the area of a region defined by intersecting extension lines of the two ends of the outer periphery of the first score (11) is S1. The second score (12) comprises a stress concentration section (121) and a reinforcement section (122); the stress concentration section (121) is spaced apart from the opening (111) in a first direction; one end of the reinforcement section (122) is connected to the stress concentration section (121), and the other end of the reinforcement section (122) is located between one end of the reinforcement section (122) and the opening (111) in the first direction; a straight line passing through one end of the stress concentration section (121) and the other end of the reinforcement section (122) is set as a first boundary line (1211), and a straight line passing through the other end of the stress concentration section (121) and the other end of the reinforcement section (122) is set as a second boundary line (1212); and the area of a region defined by the outer side edge of the stress concentration section (121), the first boundary line (1211), and the second boundary line (1212) is S2. S1 and S2 satisfy the relational expression: 5% S1 ≤ S2 ≤ 45% S1.

Description

Disclosed are a rupture disc, an explosion-proof valve, a single battery, a battery pack, and an electric energy device

[0001] The present application claims priority to the Chinese patent application No. 202421538580.5, filed on June 28, 2024, and entitled "Rupture disc, explosion-proof valve, single battery, battery pack, and electric energy device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, and in particular to a rupture disc, an explosion-proof valve, a single battery, a battery pack, and an electric energy device. BACKGROUND

[0003] In the prior art, the explosion-proof valve of a battery is usually welded to 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, so as to prevent safety accidents such as explosion of the battery. However, when the pressure in the battery changes and the pressure is too large, if the stability of the explosion-proof valve welded to the battery is not enough, the entire explosion-proof valve can be easily flushed open when pressure relief; if the stability of the explosion-proof valve welded to the battery is too strong, the explosion-proof valve can not be able to timely burst and relieve pressure, both of which can damage the safety of the battery and the entire battery system. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a rupture disc which can ensure a suitable interval of burst force values, so as to balance the connection strength and pressure relief opening capacity at the first score, and avoid the risk of early tearing and failure to timely burst and relieve pressure due to mis-bursting of the first score.

[0005] The present application further provides an explosion-proof valve.

[0006] The present application further provides a single battery.

[0007] The present application further provides a battery pack.

[0008] The present application further provides an electric energy device.

[0009] According to the rupture disc of the first aspect of the present application, the rupture disc is provided with a first score and a second score, the second score is arranged inside and spaced from the first score; the shape of the first score is configured to have an annular shape with an opening, the area of the region surrounded by the intersection of the two ends of the outer periphery of the first score is S1; the second score includes a stress concentration section and a reinforcing section, the stress concentration section is arranged in a first direction and spaced from the opening, one end of the reinforcing section is connected with the stress concentration section, the other end of the reinforcing section is located between the one end of the reinforcing section and the opening in the first direction, a straight line passing through one end of the stress concentration section and the other end of the reinforcing section is defined as a first boundary line, a straight line passing through the other end of the stress concentration section and the other end of the reinforcing section is defined as a second boundary line, the area of the region surrounded by the outer side edge of the stress concentration section, the first boundary line and the second boundary line is S2; wherein S1 and S2 satisfy the relationship: 5% S1≤S2≤45% S1.

[0010] Therefore, by limiting the area size relationship of S1 and S2, a suitable burst force value interval can be ensured, so as to balance the connection strength and pressure relief opening ability at the first score 11, and further avoid the risk of easy mis-bursting of the first score 11, which leads to early tearing and failure to timely burst and relieve pressure.

[0011] In some examples of the present application, S1 and S2 satisfy the relationship: 10% S1≤S2≤40% S1.

[0012] In some examples of the present application, the second score is one; or, the second score is n, n second scores are arranged in intervals, S1 and S2 satisfy the relationship: 5% S1≤nS2≤45% S1, n≥2.

[0013] In some examples of the present application, in the opposite direction of the first boundary line and the second boundary line, the maximum distance between the outer periphery of the first score is d1, the maximum distance between the outer periphery of the first boundary line and the outer periphery of the second boundary line is d2, d1 and d2 satisfy the relationship: 25% d1≤d2≤85% d1.

[0014] In some examples of the present application, the rupture disc includes: an explosion-proof body; a burst body, the explosion-proof body is arranged around the burst body, the first score and the second score are arranged on the burst body; wherein the thickness of the explosion-proof body is h1, the thickness of the burst body is h2, h1 and h2 satisfy: h1>h2.

[0015] In some examples of the present application, the first score line has a thickness of h3, and h1, h2 and h3 satisfy: h1>h2>h3; and / or the second score line has a thickness of h4, and h1, h2 and h3 satisfy: h1>h2>h4.

[0016] In some examples of the present application, the first score line has a thickness of h3, and the second score line has a thickness of h4, and h1, h2, h3 and h4 satisfy: h1>h2>h3>h4.

[0017] In some examples of the present application, the first score line comprises a pressure relief opening segment oppositely arranged relative to the opening, and a minimum distance between the stress concentration segment and the pressure relief opening segment is smaller than a minimum distance between the stress concentration segment and the opening.

[0018] In some examples of the present application, a minimum distance between the stress concentration segment and the pressure relief opening segment is d3, and d3 satisfies: 1.5mm≥d3>0.

[0019] In some examples of the present application, the pressure relief opening segment and the stress concentration segment are arranged in parallel.

[0020] In some examples of the present application, the pressure relief opening segment and the stress concentration segment are configured as straight lines parallel to each other; or the pressure relief opening segment and the stress concentration segment are configured as arc lines parallel to each other.

[0021] In some examples of the present application, one of the pressure relief opening segment and the stress concentration segment is configured as an arc line, and the other is configured as a straight line.

[0022] In some examples of the present application, the pressure relief opening segment is configured as a straight line, and the stress concentration segment is configured as an arc line protruding towards the pressure relief opening segment or the opening.

[0023] In some examples of the present application, the reinforcing segment is configured as a straight line extending from the stress concentration segment towards the opening.

[0024] In some examples of the present application, the stress concentration segment is configured as a straight line and arranged perpendicularly to the reinforcing segment; or the stress concentration segment is configured as an arc line, and a straight line formed by connecting two ends of the stress concentration segment and the reinforcing segment is perpendicular.

[0025] In some examples of the present application, the reinforcing segment is connected between two ends of the stress concentration segment.

[0026] In some examples of the present application, the reinforcing segment is connected at a center of the stress concentration segment.

[0027] In some examples of the present application, the first score further comprises: a first circular arc segment and a second circular arc segment, the first circular arc segment and the second circular arc segment are oppositely arranged and protrude away from each other; a pressure relief opening segment, two ends of the pressure relief opening segment are connected with one end of the first circular arc segment and one end of the second circular arc segment respectively; a first opening forming segment and a second opening forming segment, an extension line of the first opening forming segment and an extension line of the second opening forming segment coincide 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 circular arc segment, one end of the second opening forming segment is connected to one end of the second circular arc segment, and the other end of the first opening forming segment and the other end of the second opening forming segment form the opening; wherein the area surrounded by the outer periphery of the first circular arc segment, the outer periphery of the second circular 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.

[0028] In some examples of the present application, the pressure relief opening segment, the first opening forming segment and the second opening forming segment are all configured in a straight line shape; or the pressure relief opening segment, the first opening forming segment and the second opening forming segment are all configured in an arc shape.

[0029] In some examples of the present application, the thickness of the second score is the same everywhere.

[0030] The explosion-proof valve according to the second aspect of the present application comprises the rupture disc described above.

[0031] The single battery according to the third aspect of the present application comprises the explosion-proof valve described above.

[0032] The battery pack according to the fourth aspect of the present application comprises a plurality of single batteries described above.

[0033] The electric energy device according to the fifth aspect of the present application comprises a device body and a battery pack described above.

[0034] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0035] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0036] Fig. 1 is a structural schematic view of a rupture disc according to an example of the present application;

[0037] Fig. 2 is a sectional view in the direction of A-A in Fig. 1;

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

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

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

[0041] Figure 6 is a schematic diagram of an explosion-proof valve provided according to an embodiment of the present application;

[0042] Figure 7 is a schematic diagram of a battery monomer provided according to an embodiment of the present application;

[0043] Figure 8 is a schematic diagram of a battery pack provided according to an embodiment of the present application;

[0044] Figure 9 is a schematic diagram of an electric energy device provided according to an embodiment of the present application.

[0045] Reference signs: 100, rupture disc; 200, explosion-proof valve; 300, monomer battery; 400, battery pack; 500, electric energy device; 600, device body; 1, rupture body; 11, first score; 111, opening; 112, pressure relief opening segment; 113, first circular arc segment; 114, second circular arc segment; 115, first opening forming segment; 116, second opening forming segment; 12, second score; 121, stress concentration segment; 1211, first boundary line; 1212, second boundary line; 122, reinforcing segment; 2, explosion-proof body. DETAILED DESCRIPTION

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

[0047] The rupture disc 100 according to an embodiment of the present application is described below with reference to Figures 1-5, which can ensure a suitable range of rupture force values by defining the area size relationship of S1 and S2, thereby taking into account the connection strength and pressure relief opening capability at the first score 11.

[0048] In combination with Figures 1-5, the rupture disc 100 according to the first aspect embodiment of the present application is provided with a first score 11 and a second score 12, the first score 11 is configured to have a ring shape with a first opening 111, the second score 12 is configured to have a ring shape with a second opening 111, the second score 12 is surrounded by the first score 11, and the second score 12 is arranged spaced apart from the first score 11.

[0049] Specifically, the first score 11 is formed on the rupture disc 100 in a circumferential direction, and the first score 11 is not connected at its beginning and end, that is, the first score 11 not connected at its beginning and end has two opposite end points, and no score is formed between the two opposite end points, so that the shape of the first score 11 is configured as a ring with a first opening 111. Compared with a complete circle of runway type score (without a non-scored part connected to the base material), this can avoid the risk of the rupture disc 100 flying out during the detonation pressure relief process to cause a short circuit of the battery, thereby improving safety. Similarly, the beginning and end of the second score 12 are also not connected to each other, and the second score 12 is spaced apart from the first score 11 surrounding the outer periphery of the second score 12, so as to avoid the risk that the second score 12 and the first score 11 or the second score 12 itself form a closed contour to cause part of the rupture disc 100 to directly fly out during the detonation pressure relief process.

[0050] Further, the area of the region surrounded by the intersection of the two end extension lines of the outer periphery of the first score 11 is S1. It can be understood that the area of the region surrounded by the intersection of the two end extension lines (the extension lines are extended according to the extension trend of the original line segment path, that is, the straight line connecting line between the two opposite end points of the first score 11) of the outer periphery of the first score 11 is S1.

[0051] Further, the second score 12 includes a stress concentration section 121 and a reinforcing section 122. The stress concentration section 121 is spaced apart from the opening 111 in a first direction, and one end of the reinforcing section 122 is connected to the stress concentration section 121. The other end of the reinforcing section 122 is located between the one end of the reinforcing section 122 and the opening 111 in the first direction. For example, the first direction can be the front-back direction.

[0052] It can be understood that during the rupture of the rupture disc 100, stress deformation is mainly concentrated in the stress concentration section 121, so that the stress concentration section 121 plays a stress concentration role, and the reinforcing section 122 plays a reinforcing role. When the rupture disc 100 is opened, stress is mainly concentrated near the stress concentration section 121 due to the relationship that the reinforcing section 122 and the stress concentration section 121 jointly form a second score 12 in the shape of an inverted “T”, which will cause the stress concentration section 121 to deform first. When the deformation of the stress concentration section 121 reaches a certain height, tearing occurs at the local first score 11 adjacent to the stress concentration section 121, and the crack expands in the edge runway direction to both ends, and finally completely opens the rupture disc 100.

[0053] The reinforcing effect of the reinforcing section 122 ensures that the stress concentration section 121 and the material between the substrate are not easily deformed due to stress, effectively reducing the deformation height of the back part of the inverted "T"-shaped second score line 12 of the blasting disc 100, so that the local first score line 11 that first receives the tearing force can be torn without a high deformation amount. Moreover, the inverted "T"-shaped second score line 12 concentrates the stress on the middle and back part of the inverted "T"-shaped section, and the blasting disc 100 without the inverted "T"-shaped second score line 12 in the middle concentrates the stress on the middle part of the blasting disc 100 and the stress is relatively dispersed, and the angle θ tends to 0, which leads to the blasting process, and the tearing force F approaches 0, which requires a higher initiation pressure to break the first score line 11.

[0054] In detail, a straight line passing through one end of the stress concentration section 121 and the other end of the reinforcing section 122 is defined as a first boundary line 1211, and a straight line passing through the other end of the stress concentration section 121 and the other end of the reinforcing section 122 is defined as a second boundary line 1212. The area of the region surrounded by the outer side edge of the stress concentration section 121, the first boundary line 1211, and the second boundary line 1212 is S2.

[0055] That is, in the first direction, the first boundary line 1211 and the second boundary line 1212 respectively extend from the two ends of the stress concentration section 121 to the other end of the reinforcing section 122. In summary, the area of the region surrounded by the outer side edge of the stress concentration section 121, the first boundary line 1211, and the second boundary line 1212 is S2.

[0056] For example, in combination with FIG. 1, S1 is the area surrounded by the intersection of the extended lines (dashed lines) of the two end openings of the first score line 11 and the original outer periphery of the first score line 11, and S2 is the area surrounded by the outer side edge of the stress concentration section 121, the first boundary line 1211, and the second boundary line 1212.

[0057] For another example, in combination with FIG. 5, S1 is the area surrounded by the intersection of the extended lines (dashed lines extended according to the original arc extension trend) of the two end openings of the first score line 11 and the original outer periphery of the first score line 11, and S2 is the area surrounded by the outer side edge of the stress concentration section 121, the first boundary line 1211, and the second boundary line 1212.

[0058] In particular, S1 and S2 satisfy the size relationship of 5% S1≤S2≤45% S1, so that S2 and S1 are associated and maintained within a reasonable interval range, thereby avoiding excessive or insufficient blasting force of the blasting disc 100, and further taking into account the connection stability and pressure relief opening ability of the blasting disc 100.

[0059] Compared with S2 < 5% S1, the area of S2 is too small, which may cause the stress on the second score line 12 to be too concentrated, so that the first score line 11 reaches the blasting force required for detonation too early, and the first score line 11 is prone to misfire and tears ahead of time. Compared with S2 > 45% S1, the area of S2 is too large, which may cause the stress on the second score line 12 to be too dispersed and difficult to play a role in stress concentration, so that the first score line 11 cannot be detonated in time, and the risk of the battery pack failing to depressurize in time occurs.

[0060] Therefore, by limiting the area size relationship of S1 and S2, a suitable blasting force value interval can be ensured, so as to balance the connection strength and pressure relief opening ability of the first score line 11, and thus avoid the risk of misfire and tearing ahead of time and failing to blast in time.

[0061] Preferably, S1 and S2 satisfy the relationship: 10% S1 ≤ S2 ≤ 40% S1. Compared with S2 < 10% S1, the area of S2 is too small, which may cause the stress on the second score line 12 to be too concentrated, so that the first score line 11 reaches the blasting force required for detonation too early, and the first score line 11 misfires and tears. Compared with S2 > 40% S1, the area of S2 is too large, which may cause the stress on the second score line 12 to be too dispersed and difficult to play a role in stress concentration, so that the first score line 11 cannot be detonated in time, and the risk of the battery pack failing to depressurize in time occurs.

[0062] Further, as shown in FIG. 1, the first score line 11 includes a pressure relief opening section 112 arranged opposite to the 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 opening 111.

[0063] It can be understood that the pressure relief opening section 112 is arranged at a position corresponding to the opening 111 on the first score line 11, that is, the structural strength of the pressure relief opening section 112 is weaker than that of the opening 111. At this time, the opening 111 position corresponds to the fulcrum, and the pressure relief opening section 112 position opposite to the opening 111 corresponds to the farthest point from the fulcrum. According to the lever theorem, the farthest point is the weak point, so that the bursting disc 100 is more likely to burst from the pressure relief opening section 112.

[0064] The stress concentration section 121 on the second score 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 smaller than the minimum distance between the stress concentration section 121 and the opening 111, so that the part of the rupture disc 100 between the stress concentration section 121 and the pressure relief opening section 112 can be quickly arched when subjected to a smaller detonation air pressure, thereby tearing the score on the pressure relief opening section 112 at the outer edge detonation point earlier, and then extending the tearing path from the pressure relief opening section 112 to the first scores 11 on both sides. For example, the score on the stress concentration section 121 of the rupture disc 100 is quickly arched to form an angle with the outer edge detonation point (pressure relief opening section 112) when stressed, thereby playing a role in tearing the entire first score 11.

[0065] In addition, compared with the prior art structure in which two semicircular scores intersect at the middle of the score, the stress concentration section 121 in the embodiment is closer to the first score 11 at the outer edge, which is more conducive to detonating the first score 11 at the outer edge and avoids the problems of easy middle detonation and small detonation area of the rupture disc 100, thereby facilitating rapid pressure relief of the battery pack. In addition, compared with a single circle of "runway type" score structure (the stress on the score is too dispersed, which is not conducive to the rapid rupture of the rupture disc 100), the embodiment has higher consistency of the rupture disc 100 opening position (that is, the pressure relief opening section 112), more stable detonation pressure, and smaller required detonation pressure, which is conducive to battery pressure relief.

[0066] Specifically, as shown in FIG. 1, the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is d1, which satisfies: 1.5 mm ≥ d3 > 0. The minimum distance between the stress concentration section 121 and the pressure relief opening section 112 is less than 1.5 mm, so that the minimum distance between the stress concentration section 121 and the pressure relief opening section 112 can be avoided to be too large, thereby changing the detonation pressure position on the first score 11 on the basis of ensuring the critical detonation pressure of the rupture disc 100, reducing the required detonation pressure of the rupture disc 100, and facilitating rapid rupture of the rupture disc 100 for pressure relief. For example, d3 is 0.5 mm, 1 mm or 1.5 mm, but is not limited thereto.

[0067] In addition, as shown in FIG. 1 and FIG. 4, when the stress concentration section 121 is closer to the pressure relief opening section 112, the angle of material deformation θ between the stress concentration section 121 and the pressure relief opening section 112 is larger, and the relationship between the tearing force F1 and the vertical force F generated by the air pressure is Fsinθ=F1. Therefore, when the angle θ is larger, the tearing force F1 is larger, so that the detonation at a lower detonation pressure F can be achieved. In the embodiment, the second score 12 in the inverted "T" shape allows the stress of the rupture disc 100 to be concentrated at the rear of the inverted "T" shape, and the stress of the rupture disc 100 without the second score 12 in the inverted "T" shape is concentrated at the middle of the rupture disc 100 and is relatively dispersed, and the angle θ tends to 0, which results in that the tearing force F1 in the blasting process is close to 0, and a higher detonation pressure is required to break the first score 11.

[0068] Further, as shown in FIG. 1 and FIG. 5, 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 misblasting caused by the stress being excessively concentrated at a certain point and the rupture disc 100 being easily detonated can be avoided, thereby reserving a certain safety buffer interval for the detonation pressure of the rupture disc 100.

[0069] Specifically, as shown in FIG. 1 and FIG. 5, the pressure relief opening section 112 and the stress concentration section 121 are configured as straight lines parallel to each other; or the pressure relief opening section 112 and the stress concentration section 121 are configured as arc lines parallel to each other.

[0070] It can be understood that, as shown in FIG. 1, when the pressure relief opening section 112 and the stress concentration section 121 are both straight lines, they are parallel to each other, so that the consistency of processing can be more easily ensured. In addition, since the pressure relief opening section 112 and the stress concentration section 121 uniformly weaken the structural strength of the upper edge of the part of the rupture disc 100 sandwiched therebetween, on the one hand, the function of changing the stress concentration position of the rupture disc 100 can be achieved, and on the other hand, the consistency and stability of the crack propagation of the first score 11 when the rupture disc 100 is detonated can be facilitated.

[0071] Further, one of the pressure relief opening section 112 and the stress concentration section 121 is configured as an arc line, and the other of the pressure relief opening section 112 and the stress concentration section 121 is configured as a straight line. For example, the stress concentration section 121 is configured as a straight line, and the pressure relief opening section 112 is configured as an arc line, so that the stress concentration area can be smaller, the stress can be more quickly concentrated on the rupture disc 100 between the two, the rupture disc 100 can obtain a faster detonation speed, and the detonation sensitivity of the rupture disc 100 can be improved.

[0072] Specifically, the pressure relief opening section 112 is configured in a straight line shape, and the stress concentration section 121 is configured in an arc line shape protruding towards the pressure relief opening section 112 or the opening 111. It can be understood that the pressure relief opening section 112 is configured in a straight line shape, and the stress concentration section 121 is configured in an arc line shape, so that the stress concentration area is smaller, thereby making the required detonation stress of the rupture disc 100 smaller and the pressure relief speed faster.

[0073] Further, as shown in FIG. 1, the reinforcing section 122 is configured in a straight line shape extending from the stress concentration section 121 to the opening 111. It can be understood that the reinforcing section 122 is configured in a straight line shape, so that the space mode between the stress concentration section 121 and the opening 111 is increased, thereby reducing the required detonation force of the rupture disc 100 between the stress concentration section 121 and the pressure relief opening section 112 when detonated, and also enabling the pressure to be more concentrated in the area between the stress concentration section 121 and the pressure relief opening section 112, thereby facilitating the rapid detonation of the rupture disc 100.

[0074] Optionally, as shown in FIG. 1, the stress concentration section 121 is configured in a straight line shape, and the stress concentration section 121 is arranged perpendicularly to the reinforcing section 122. Among them, the stress concentration section 121 is configured in a straight line shape, which can ensure the accuracy and consistency of processing.

[0075] In addition, the stress concentration section 121 and the reinforcing section 122 are connected in a perpendicular manner. When the rupture disc 100 is subjected to air pressure, stress is concentrated at the stress concentration section 121, and the reinforcing section 122 can strengthen the bending and torsional stiffness of the rupture disc 100 in the direction perpendicular to the stress concentration section 121, so that the rupture disc 100 is not easily deformed in the direction perpendicular to the stress concentration section 121, effectively reducing the deformation height of the rupture disc 100 near the stress concentration section 121, and enabling the pressure relief opening section 112 to tear without a very high deformation amount.

[0076] Another option, as shown in FIG. 5, the stress concentration section 121 is configured in an arc line shape, and the straight line formed by the connection of the reinforcing section 122 and the two ends of the stress concentration section 121 is perpendicular. Among them, the stress concentration section 121 is configured in an arc line shape, so that the stress concentration area is smaller, thereby making the required detonation stress of the rupture disc 100 smaller and the pressure relief speed faster, and the straight line formed by the connection of the reinforcing section 122 and the two ends of the stress concentration section 121 is perpendicular to each other, so that the reinforcing section 122 can effectively strengthen the bending and torsional stiffness of the rupture disc 100 in the direction perpendicular to the stress concentration section 121, so that the rupture disc 100 is not easily deformed in the direction perpendicular to the stress concentration section 121, thereby effectively reducing the deformation height of the rupture disc 100 near the stress concentration section 121, and enabling the pressure relief opening section 112 to tear without a very high deformation amount.

[0077] Specifically, as shown in FIG. 1 and FIG. 5, the reinforcing section 122 is connected between the two ends of the stress concentration section 121. Among them, 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 opening 111, so that on the one hand, the bending and torsional stiffness of the rupture disc 100 in the direction perpendicular to the stress concentration section 121 can be strengthened, so that the rupture disc 100 is not easy to deform in this direction; on the other hand, the number of notches can also be reduced, thereby reducing the workload.

[0078] Further, as shown in FIG. 1 and FIG. 5, the reinforcing section 122 is connected at the center of the stress concentration section 121. It can be understood that one end of the reinforcing section 122 is connected at the center of the stress concentration section 121, and the other end extends towards the opening 111, so that the bending and torsional stiffness of the rupture disc 100 on both sides of the center of the stress concentration section 121 can be uniformly increased, thereby improving the consistency and uniformity of the crack tearing of the first notch 11.

[0079] Specifically, as shown in FIG. 1, in the opposite direction of the first boundary line 1211 and the second boundary line 1212, the maximum distance between the outer perimeters of the first notches 11 is d1, and the maximum distance between the outer perimeters of the first boundary line 1211 and the second boundary line 1212 is d2, and d1 and d2 satisfy the relationship: 25% d1≤d2≤85% d1.

[0080] It can be understood that in the opposite direction of the first boundary line 1211 and the second boundary line 1212 (such as the left and right directions in the figure), the maximum distance d1 between the outer perimeters of the first notches 11 and the maximum distance d2 between the outer perimeters of the first reinforcing section 122 and the second reinforcing section 122 satisfy the size relationship of 25% d1≤d2≤85% d1, so that d1 and d2 are associated and kept within a reasonable interval, thereby avoiding the blasting force of the rupture disc 100 being too large or too small when detonated, and thereby balancing the connection stability and pressure relief opening ability of the rupture disc 100.

[0081] Among them, compared with d2<25% d1, at this time the maximum distance d2 is too small, so that the stress on the second notch 12 may be too concentrated, thereby causing the first notch 11 to prematurely reach the size of the blasting force required for detonation, and thereby causing the first notch 11 to misfire and tear prematurely; compared with d2>85% d1, at this time the maximum distance d2 is too large, so that the stress on the second notch 12 may be too dispersed and difficult to play a stress concentration role, thereby causing the first notch 11 to fail to detonate in time, and thereby causing the risk of the battery pack failing to relieve pressure in time.

[0082] For example, as shown in FIG. 1, the area formula of S1 is S1=(d1-d5)×d5+π×d52 / 4, d5 is the diameter of the first circular arc segment 113 and the second circular arc segment 114, and the area formula of S2 is S2=d2×d4 / 2, d4 is the sum of the length of the reinforcing segment 122 and the width of the stress concentration segment 121. In this way, the design not only facilitates processing, but also ensures the consistency and accuracy of the required pressure for detonation.

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

[0084] When the number of the second score line 12 is multiple, the first score line 11 surrounds multiple second score lines 12, and a plurality of similar second score lines 12 can also achieve the effect of small detonation pressure and fast detonation speed. Among them, the sum of the S2 areas formed by the multiple second score lines 12 surrounded by the first score line 11 and the S1 formed by the first score line 11 satisfy the size relationship of 5% S1≤nS2≤45% S1, so that the appropriate blasting force value interval can be ensured, so as to balance the connection strength and pressure relief opening ability at the first score line 11, and further avoid the risk of easy mis-blast tear and unable to timely blast pressure relief of the first score line 11.

[0085] According to some optional embodiments of the present application, as shown in FIG. 1 and FIG. 5, the first score line 11 further includes a first circular arc segment 113, a second circular arc segment 114, a pressure relief opening segment 112, a first opening forming segment 115 and a second opening forming segment 116, the first circular arc segment 113 and the second circular arc segment 114 are oppositely arranged and protrude away from each other, the two ends of the pressure relief opening segment 112 are connected with one end of the first circular arc segment 113 and one end of the second circular arc segment 114 respectively, the extension line of the first opening forming segment 115 and the extension line of the second opening forming segment 116 coincide and are parallel to the pressure relief opening segment 112, one end of the first opening forming segment 115 is connected to one end of the first circular arc segment 113, one end of the second opening forming segment 116 is connected to one end of the second circular arc segment 114, and the other end of the first opening forming segment 115 and the other end of the second opening forming segment 116 form an opening 111; wherein the area of the region surrounded by the outer periphery of the first circular arc segment 113, the outer periphery of the second circular arc segment 114, the outer periphery of the pressure relief opening segment 112, the outer periphery of the first opening forming segment 115 and the outer periphery of the second opening forming segment 116 is S1.

[0086] For example, the area of the region jointly formed by the outer periphery of the first opening forming segment 115, the first circular arc segment 113, the pressure relief opening segment 112, the second circular arc segment 114, and the second opening forming segment 116, which are sequentially connected, and the extension line of the outer periphery of the first opening forming segment 115 and the second opening forming segment 116 is S1.

[0087] In detail, the first opening forming segment 115, the first circular arc segment 113, the pressure relief opening segment 112, the second circular arc segment 114, and the second opening forming segment 116 are sequentially connected, the extension line of the first opening forming segment 115 and the extension line of the second opening forming segment 116 coincide with each other, the opening 111 is spaced between the other end of the first opening forming segment 115 and the other end of the second opening forming segment 116, and the first circular arc segment 113 and the second circular arc segment 114 protrude away from each other, that is, the first score 11 is integrally configured as a runway type shape with the opening 111. Such a score structure is simpler, does not affect the critical pressure of the bursting disc 100, can meet the explosion-proof strength requirements of the single battery, can ensure the basic pressure relief function, and can prevent the bursting disc 100 from flying out during detonation.

[0088] Specifically, as shown in FIGS. 1 and 5, the pressure relief opening segment 112, the first opening forming segment 115, and the second opening forming segment 116 are all configured as straight lines; or the pressure relief opening segment 112, the first opening forming segment 115, and the second opening forming segment 116 are all configured as arc lines.

[0089] That is, the pressure relief opening segment 112, the first opening forming segment 115, and the second opening forming segment 116 are configured as straight lines or arc lines, which can easily ensure the accuracy and consistency of processing. In addition, the connection between different score segments on the first score 11 adopts a circular arc transition, which can more easily ensure the processing and manufacturing of the integral forming of the first score 11.

[0090] According to some optional embodiments of the present application, as shown in FIGS. 1 and 5, the bursting disc 100 includes an explosion-proof body 2 and a bursting body 1, the explosion-proof body 2 is arranged around the bursting body 1, the first score 11 and the second score 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 score 11 is h3, and the thickness of the second score 12 is h4, h1, h2, h3, and h4 satisfy: h1>h2>h4>h3. Wherein, the thickness of the first score 11 and the second score 12 refers to the thickness of the explosion-proof body 2 remaining after the formation of the score groove.

[0091] Specifically, the thickness distribution relationship can change the stress concentration position of the rupture disc 100 under the action of the second score 12 and cannot be opened before the detonation zone (the pressure relief opening segment 112), that is, the rupture disc 100 can be accurately exploded at the pressure relief opening segment 112, preventing the phenomenon of insufficient pressure relief area caused by explosion at the position of the second score 12, ensuring the consistency and accuracy of the pressure required for the rupture disc 100 to explode. In addition, the thickness of the explosion-proof body 2 is greater than the thickness of the explosion body 1, so the strength of the base material welding area of the rupture disc 100 can also be ensured.

[0092] According to some optional embodiments of the present application, the thickness of the second score 12 is the same, which can ensure the consistency and accuracy of the second score 12, and the stress on each part of the second score 12 is more uniform, thereby ensuring the consistency of the explosion pressure of the rupture disc 100.

[0093] In combination with FIGS. 1 and 6, the explosion-proof valve 200 according to the second aspect of the present application includes the rupture disc 100 of the above-mentioned embodiments, so that the explosion-proof valve 200 with the rupture disc 100 can make the required explosion pressure of the explosion-proof valve 200 itself smaller and the pressure relief speed faster.

[0094] As shown in FIG. 7, the single battery 300 according to the third aspect of the present application includes the explosion-proof valve 200 of the above-mentioned embodiments, so that the single battery 300 with the explosion-proof valve 200 can more quickly dissipate the high pressure in the single battery when the single battery is in a situation of explosion caused by collision of the single battery itself, thereby improving the safety of the single battery.

[0095] As shown in FIG. 8, the battery pack 400 according to the fourth aspect of the present application includes a plurality of single batteries 300 of the above-mentioned embodiments, so that the battery pack 400 with the single battery 300 can timely and quickly relieve the pressure of the battery pack in a sudden high pressure state, thereby improving the safety of the battery pack 300.

[0096] As shown in FIG. 9, the electric energy device 500 according to the fifth aspect of the present application includes a device body 600 and a battery pack 400 of the above-mentioned embodiments. The electric energy device 500 can be a vehicle, an aircraft, a ship, an energy storage device, or a household appliance, etc. The vehicle and other devices with the battery pack 400 can improve the safety thereof and ensure the safety of the user.

[0097] In the description of the application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the application.

[0098] In the description of the application, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0099] In the description of the specification, the description referring to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0100] Although the embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the application, and the scope of the application is defined by the claims and their equivalents.

Claims

1. A burst disc (100), wherein, The rupture disc (100) is provided with a first score line (11) and a second score line (12), the second score line (12) is surrounded by the first score line (11) and is arranged at intervals with the first score line (11); The shape of the first score line (11) is configured to have an annular shape with an opening (111), the area of the region surrounded by the intersection of the two ends of the outer periphery of the first score line (11) is S1; The second score line (12) includes a stress concentration section (121) and a reinforcing section (122), the stress concentration section (121) is arranged at intervals with the opening (111) along a first direction, one end of the reinforcing section (122) is connected with the stress concentration section (121), the other end of the reinforcing section (122) is located between the one end of the reinforcing section (122) and the opening (111) in the first direction, a straight line passing through the one end of the stress concentration section (121) and the other end of the reinforcing section (122) is defined as a first boundary line (1211), a straight line passing through the other end of the stress concentration section (121) and the other end of the reinforcing section (122) is defined as a second boundary line (1212), the area of the region surrounded by the outer side edge of the stress concentration section (121), the first boundary line (1211) and the second boundary line (1212) is S2; Wherein, S1 and S2 satisfy the relationship: 5% S1≤S2≤45% S1.

2. The burst disc (100) of claim 1, wherein, S1 and S2 satisfy the relationship: 10% S1≤S2≤40% S1.

3. The burst disc (100) of claim 1, wherein, The second score line (12) is one; Or, the second score line (12) is n, n second score lines (12) are arranged at intervals, S1 and S2 satisfy the relationship: 5% S1≤nS2≤45% S1, n≥2.

4. The burst disc (100) according to any one of claims 1-3, wherein, In the opposite direction of the first boundary line (1211) and the second boundary line (1212), the maximum distance between the outer periphery of the first score line (11) is d1, the maximum distance between the outer periphery of the first boundary line (1211) and the outer periphery of the second boundary line (1212) is d2, d1 and d2 satisfy the relationship: 25% d1≤d2≤85% d1.

5. The burst disc (100) according to any one of claims 1-4, wherein, The rupture disc (100) includes: An explosion-proof body (2); An explosion body (1), the explosion-proof body (2) is arranged around the explosion body (1), the first score line (11) and the second score line (12) are arranged in the explosion body (1); Wherein, the thickness of the explosion-proof body (2) is h1, the thickness of the explosion body (1) is h2, h1 and h2 satisfy: h1>h2.

6. The burst disc (100) of claim 5, wherein, The thickness of the first score line (11) is h3, h1, h2 and h3 satisfy: h1>h2>h3; and / or, the thickness of the second score line (12) is h4, h1, h2 and h3 satisfy: h1>h2>h4.

7. The burst disc (100) of claim 5, wherein, The thickness of the first score line (11) is h3, the thickness of the second score line (12) is h4, h1, h2, h3 and h4 satisfy: h1>h2>h3>h4.

8. The burst disc (100) according to any one of claims 1-7, wherein, The first score line (11) comprises a pressure relief opening segment (112) oppositely arranged with the opening (111), and a minimum distance between the stress concentration segment (121) and the pressure relief opening segment (112) is smaller than a minimum distance between the stress concentration segment (121) and the opening (111).

9. The burst disc (100) of claim 8, wherein, The minimum distance between the stress concentration segment (121) and the pressure relief opening segment (112) is d3, and d3 satisfies: 1.5mm≥d3>0.

10. The burst disc (100) according to claim 8 or 9, wherein The pressure relief opening segment (112) and the stress concentration segment (121) are arranged in parallel.

11. The burst disc (100) of claim 10, wherein, The pressure relief opening segment (112) and the stress concentration segment (121) are configured as straight lines parallel to each other; or The pressure relief opening segment (112) and the stress concentration segment (121) are configured as arc lines parallel to each other.

12. The burst disc (100) of claim 8 or 9, wherein, One of the pressure relief opening segment (112) and the stress concentration segment (121) is configured as an arc line, and the other is configured as a straight line.

13. The burst disc (100) of claim 12, wherein, The pressure relief opening segment (112) is configured as a straight line, and the stress concentration segment (121) is configured as an arc line protruding towards the pressure relief opening segment (112) or the opening (111).

14. The burst disc (100) according to any one of claims 1-13, wherein, The reinforcing segment (122) is configured as a straight line extending from the stress concentration segment (121) to the opening (111).

15. The burst disc (100) according to any one of claims 1-14, wherein, The stress concentration segment (121) is configured as a straight line and is arranged perpendicularly to the reinforcing segment (122); or The stress concentration segment (121) is configured as an arc line, and the reinforcing segment (122) is perpendicular to a straight line formed by connecting two ends of the stress concentration segment (121).

16. The burst disc (100) according to any one of claims 1-15, wherein, The reinforcing segment (122) is connected between the two ends of the stress concentration segment (121).

17. The burst disc (100) of claim 16, wherein, The reinforcing segment (122) is connected at the center of the stress concentration segment (121).

18. The burst disc (100) according to any one of claims 1-17, wherein, The first score line (11) further comprises: a first arc segment (113) and a second arc segment (114) oppositely arranged and protruding away from each other; a pressure relief opening segment (112) having two ends connected to one end of the first arc segment (113) and one end of the second arc segment (114), respectively; a first opening forming segment (115) and a second opening forming segment (116), an extension line of the first opening forming segment (115) and an extension line of the second opening forming segment (116) coincide and are parallel to the pressure relief opening segment (112), one end of the first opening forming segment (115) is connected to one end of the first arc segment (113), one end of the second opening forming segment (116) is connected to one end of the second arc segment (114), and the other end of the first opening forming segment (115) and the other end of the second opening forming segment (116) form the opening (111); An area surrounded by the outer periphery of the first circular arc segment (113), the outer periphery of the second circular 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.

19. The burst disc (100) of claim 18, wherein, The pressure relief opening segment (112), the first opening forming segment (115), and the second opening forming segment (116) are each configured as a straight line; or The pressure relief opening segment (112), the first opening forming segment (115), and the second opening forming segment (116) are each configured as an arc line.

20. The burst disc (100) according to any one of claims 1-19, wherein, The second score (12) has a uniform thickness.

21. An explosion relief valve (200), wherein The rupture disc (100) of any one of claims 1-20. The rupture disc (100) of any one of claims 1-20.

22. A monobloc battery (300), wherein, The rupture disc (100) of any one of claims 1-20. The plurality of single batteries (300) of claim 22.

23. A battery pack (400), wherein The plurality of single batteries (300) of claim 22. The battery pack (400) of claim 23.

24. An electrical energy device (500), wherein The battery pack (400) of claim 23. ​

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