Explosion-proof valve, battery pack and vehicle

Abstract

The present application relates to, but is not limited to, the technical field of batteries. Disclosed are an explosion-proof valve, a battery cell, a battery pack and a vehicle. The explosion-proof valve comprises a first base region and a second base region, wherein the first base region is disposed around the circumferential edge of the second base region, and the thickness of the first base region is greater than the thickness of the second base region; the second base region is provided with a score; and the first base region has a first surface and a second surface opposite each other in the direction of thickness, a boss structure is provided on the first surface, and the boss structure is located at the periphery of the score.

Description

Explosion-proof valves, battery packs and vehicles

[0001] This application claims priority to Chinese Patent Application No. 202421684829.3, filed on July 16, 2024, entitled "Explosion-proof Valve, Battery Cell, Battery Pack and Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to, but is not limited to, the field of battery technology, and particularly to an explosion-proof valve, a battery pack, and a vehicle. Background Technology

[0003] Square / blade-shaped lithium batteries are typically designed with explosion-proof valves to release internal pressure in the event of thermal runaway. The location of the explosion-proof valve must meet requirements for opening, sealing, and long-term reliability. To meet the opening pressure requirements, explosion-proof valves are usually designed to be relatively thin, with the residual thickness of the groove typically ranging from 40μm to 100μm.

[0004] To ensure the reliability of battery packs during use, vibration tests are typically conducted to simulate the vibrations experienced during vehicle operation. During these tests, the battery pack undergoes vibrations in the X, Y, and Z directions. However, due to factors such as metal fatigue, weak points in the explosion-proof valve are prone to fatigue fracture during vibration testing, leading to battery pack leakage. Summary of the Invention

[0005] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0006] This application discloses an explosion-proof valve, a battery pack, and a vehicle.

[0007] The first aspect of this application discloses an explosion-proof valve, including a first base region and a second base region;

[0008] The first substrate region is disposed around the circumferential edge of the second substrate region, and the thickness of the first substrate region is greater than the thickness of the second substrate region, and the second substrate region is provided with grooves;

[0009] The first substrate region has a first surface and a second surface opposite each other along the thickness direction. The first surface is provided with a boss structure, which is located around the groove.

[0010] In some embodiments, the first substrate region is racetrack shaped, and the first substrate region includes a first arc-shaped region and a second arc-shaped region disposed opposite to each other;

[0011] The boss structure includes a first boss and a second boss. The first boss is disposed in the first arc-shaped area and extends circumferentially along the first arc-shaped area, and the second boss is disposed in the second arc-shaped area and extends circumferentially along the second arc-shaped area.

[0012] In some embodiments, along the thickness direction of the first substrate region, the boss structure and the cross-section of the first substrate region are jointly constructed into an I-shape, C-shape, Z-shape or S-shape.

[0013] In some embodiments, along the thickness direction of the first substrate region, the cross-section of the boss structure is T-shaped, and the cross-section of the first substrate region is I-shaped;

[0014] The lower end of the T-shape is connected to the middle of the upper surface of the I-shape to jointly form an I-shape.

[0015] In some embodiments, the horizontal width of the straight line is L1, where 2mm ≤ L1 ≤ 5mm;

[0016] The lateral distance between the outer edge of the vertical segment of the T-shape and the outer edge of the straight line is L2, where L2 ≥ 0.5L1.

[0017] In some embodiments, the vertical thickness of the straight line is H3, where 0.4mm ≤ H3 ≤ 0.8mm;

[0018] The horizontal width of the vertical segment of the T-shape is L3, where L3 ≥ H3.

[0019] In some embodiments, the sum of the vertical heights of the T-shape and the straight shape is H1, where 2mm ≤ H1 ≤ 3mm;

[0020] The vertical thickness of the straight line is H3, where 0.4mm ≤ H3 ≤ 0.8mm;

[0021] The vertical thickness of the horizontal segment of the T-shape is H2, where H2 = H3, or the difference between H2 and H3 is less than 0.05 mm.

[0022] In some embodiments, the upper end of the vertical segment of the T-shape forms a first smooth transition rounded corner with the lower end face of the horizontal segment of the T-shape on both sides along the horizontal direction.

[0023] The lower end of the vertical segment of the T-shape forms a second smooth transition rounded corner with the upper end face of the I-shape on both sides along the horizontal direction.

[0024] A second aspect of this application discloses a battery pack including an explosion-proof valve as described in any of the above embodiments.

[0025] A third aspect of this application discloses a vehicle including a battery pack as described in the above embodiments.

[0026] The technical solution disclosed in this application has the following advantages:

[0027] The explosion-proof valve, battery pack, and vehicle disclosed in this application include a first base region and a second base region. The first base region surrounds the circumferential edge of the second base region, and the thickness of the first base region is greater than the thickness of the second base region. The second base region has grooves to ensure reliable installation of the explosion-proof valve on the battery cell through the relatively thick first base region. By providing grooves in the relatively thin second base region, the explosion-proof valve can burst and release pressure from the grooves when subjected to pressure, thereby achieving the purpose of explosion protection. The first base region has a first surface and a second surface opposite to each other along the thickness direction. The surface is provided with a boss structure, which is located around the score mark. By setting the boss structure, the structural strength of the explosion-proof valve is strengthened, the stress at the weak point of the explosion-proof valve is reduced, and metal fatigue is alleviated. In this way, during the vibration test of the battery pack, the boss structure located around the score mark can absorb the impact force generated during the vibration test, thereby reducing the force transmitted to the score mark of the explosion-proof valve, that is, reducing the impact on the score mark of the explosion-proof valve, thereby reducing the risk of fatigue fracture from the score mark of the explosion-proof valve during the vibration test, and thus effectively reducing the risk of battery pack leakage.

[0028] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 is a schematic diagram of the structure of an explosion-proof valve according to an embodiment of this application;

[0032] Figure 2 is a three-dimensional structural schematic diagram of the battery cell cover plate according to an embodiment of this application;

[0033] Figure 3 is an exploded structural diagram of the cell cover plate according to an embodiment of this application;

[0034] Figure 4 is a top view of the battery cell cover plate according to an embodiment of this application;

[0035] Figure 5 is a schematic diagram of the cross-sectional structure along direction AA in Figure 4;

[0036] Figure 6 is a partial enlarged structural diagram of part B in Figure 5;

[0037] Figure 7 is a partially enlarged structural diagram of part C in Figure 6;

[0038] Figure 8 is a schematic diagram of the dimensional parameters of a partial structure of the explosion-proof valve according to an embodiment of this application.

[0039] Among them, 1. Cell cover plate; 11. Explosion-proof valve; 111. First base area; 112. Second base area; 113. Boss structure; 1131. First boss; 1132. Second boss; 114. Score; 12. Terminal post; 13. Sealing ring; 14. Lower plastic; 15. Cover plate body; 151. Mounting through hole; 152. Limiting groove; 16. Upper plastic; 17. Riveting block; 18. Explosion-proof valve patch. Detailed Implementation

[0040] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0042] Referring to Figures 1 to 8, some embodiments of this application disclose an explosion-proof valve 11. This explosion-proof valve 11 can be installed on products such as battery packs, specifically on the battery cells of the battery pack, to promptly release pressure and cause an explosion when an abnormality occurs inside the cell, thereby achieving the purpose of explosion prevention. Of course, this explosion-proof valve 11 is not limited to battery packs; it can also be applied to other products with explosion-proof requirements as needed.

[0043] Referring to FIG1, some embodiments of the explosion-proof valve 11 disclosed in this application include a first base region 111 and a second base region 112. The first base region 111 is disposed around the circumferential edge of the second base region 112, and the thickness of the first base region 111 is greater than the thickness of the second base region 112. The second base region 112 is provided with a notch 114. This configuration allows for reliable installation of the explosion-proof valve 11 on the battery cell through the relatively thick first base region 111, and the notch 114 on the relatively thin second base region 112 allows the explosion-proof valve 11 to burst and release pressure from the notch 114 when subjected to pressure, thereby achieving the purpose of explosion protection.

[0044] It should be noted that, in order to achieve the purpose of burst pressure relief, the second base region 112 of the explosion-proof valve 11 is usually set as a relatively thin diaphragm, and the second base region 112 is provided with a notch 114. The residual thickness at the notch 114 is even thinner, so that the explosion-proof valve 11 can burst and relieve pressure from the notch 114 when it is subjected to pressure. The first base region 111 is arranged around the circumferential edge of the second base region 112, and the thickness of the first base region 111 is greater than the thickness of the second base region 112. The first base region 111 is formed into a skirt-like structure for welding and fixing with other components of the battery cell (such as cover plates) to achieve reliable installation of the explosion-proof valve 11 on the battery cell.

[0045] The first substrate region 111 has a first surface and a second surface that are opposite each other along the thickness direction. The first surface is provided with a boss structure 113, which is located around the groove 114. Referring to FIG1, the vertically upward arrow in the figure indicates the thickness direction of the first substrate region 111.

[0046] The explosion-proof valve 11 disclosed in this application embodiment has a boss structure 113 provided on the first surface of the first base region 111 along the thickness direction, and the boss structure 113 is located on the periphery of the groove 114. By providing the boss structure 113, the structural strength of the explosion-proof valve 11 is strengthened, the stress at the weak point of the explosion-proof valve 11 is reduced, and metal fatigue is alleviated. During the vibration test of the battery pack, the boss structure 113 located on the periphery of the groove 114 can absorb the impact force generated during the vibration test, thereby reducing the force transmitted to the groove 114 of the explosion-proof valve 11, that is, reducing the impact at the groove 114 of the explosion-proof valve 11. This reduces the risk of fatigue fracture from the groove 114 of the explosion-proof valve 11 during the vibration test, and thus effectively reduces the risk of battery pack leakage.

[0047] In some embodiments, referring to FIG1, the first base region 111 is racetrack shaped, and the first base region 111 includes a first arc-shaped region and a second arc-shaped region disposed opposite to each other; the boss structure 113 includes a first boss 1131 and a second boss 1132, the first boss 1131 is disposed in the first arc-shaped region and extends circumferentially along the first arc-shaped region, and the second boss 1132 is disposed in the second arc-shaped region and extends circumferentially along the second arc-shaped region.

[0048] In other words, along the circumference of the first base region 111, the first boss 1131 is formed as an arc-shaped boss that matches the shape of the first arc-shaped region, and the second boss 1132 is formed as an arc-shaped boss that matches the shape of the second arc-shaped region. This arrangement allows for structural reinforcement of the arc-shaped regions at both ends of the first base region 111 through the first boss 1131 and the second boss 1132.

[0049] For example, taking a square / blade lithium battery as an example, in actual use, the explosion-proof valve 11 is usually installed vertically on the cell of the battery pack in an upright state. Referring to Figure 1, the upward arrow in the figure indicates the upright direction of the explosion-proof valve 11, and the first arc-shaped area and the second arc-shaped area of ​​the explosion-proof valve 11 are arranged opposite each other in the upright direction. During the vibration test of the battery pack, the vibration of the battery pack along the vertical direction is more obvious. The groove 114 on the explosion-proof valve 11 is subjected to a large tensile force in the vertical direction. The explosion-proof valve 11 disclosed in this application provides a first protrusion 1131 and a second protrusion 1132 in the first arc-shaped area and the second arc-shaped area of ​​the first base area 111, respectively. That is, the first protrusion 1131 and the second protrusion 1132 are respectively provided at both ends of the first base area 111 along the vertical direction. This strengthens the structural strength of both ends of the first base area 111 along the vertical direction, thereby effectively absorbing the impact force generated in the vertical direction due to vibration. This reduces the impact force transmitted to the groove 114 of the explosion-proof valve 11, thereby reducing the risk of fatigue fracture from the groove 114 of the explosion-proof valve 11 during the vibration test.

[0050] It should be noted that, in actual installation, the protrusion structure 113 is not limited to being provided only at both ends of the first base region 111 along the vertical direction to reinforce the structure at both ends of the first base region 111 along the vertical direction. Other parts of the first base region 111 can also be reinforced as needed. For example, the protrusion structure 113 is provided on the entire circumference of the first base region 111, that is, the protrusion structure 113 is an annular protrusion structure 113 provided along the circumference of the first base region 111; or, the protrusion structure 113 is provided according to the setting position of the notch 114, the notch 114 is set as a non-closed annular structure, and correspondingly, the protrusion structure 113 is also set as a non-closed annular structure.

[0051] Furthermore, the first base region 111 is not limited to a racetrack shape; it can also be other shapes such as a ring. Similarly, boss structures 113 can be provided at both ends of the first base region 111 along the vertical direction for structural reinforcement. Moreover, it is not limited to structural reinforcement only at both ends of the first base region 111 along the vertical direction; other parts of the first base region 111 can also be structurally reinforced as needed. As long as they do not deviate from the design concept of this application, they should all be within the protection scope of this application.

[0052] In some embodiments, referring to Figures 1, 6, 7, and 8, the boss structure 113 and the cross-section of the first base region 111 are jointly constructed into an I-shape along the thickness direction of the first base region 111. Alternatively, the portion of the first base region 111 where the boss structure 113 is located and the cross-section of the boss structure 113 along the thickness direction of the first base region 111 are jointly constructed into an I-shape. This configuration makes the first base region 111 and the boss structure 113 thereon appear as an I-beam, similar in shape to a building steel beam or a train track steel beam. The I-beam structure is simple, has high structural strength, good stability, and good fatigue resistance. In battery packs and vehicle applications, it can reduce metal fatigue failure caused by vibration, improving the reliability and safety performance of the battery pack and vehicle.

[0053] It should be understood that the "section along the thickness direction of the first substrate region 111" described in the above embodiments, for embodiments in which the first boss 1131 and the second boss 1132 are respectively provided in the first arc-shaped region and the second arc-shaped region of the first substrate region 111, refers to a section along the thickness direction of the first substrate and passing through the radius of the first arc-shaped region (or the second arc-shaped region).

[0054] In some embodiments, referring to Figures 1, 6, 7 and 8, the cross-section of the boss structure 113 is T-shaped along the thickness direction of the first base region 111, and the cross-section of the first base region 111 is I-shaped; specifically, the cross-section of the boss structure 113 is T-shaped along the thickness direction of the first base region 111, and the cross-section of the portion of the first base region 111 where the boss structure 113 is provided is I-shaped; the lower end of the T-shape is connected to the middle of the upper surface of the I-shape to jointly form an H-shape.

[0055] This configuration results in the boss structure 113 on the first base region 111 appearing as a T-beam, forming an I-beam shape together with the portion of the first base region 111 where the boss structure 113 is located. In actual manufacturing, a T-shaped boss structure 113 can be added to the first surface of the first base region 111 of the explosion-proof valve 11, based on the existing structure. Specifically, the boss structure 113 can be integrally formed with the first base region 111, or it can be installed and fixed to the first base region 111 as an independent component, for example, by welding or bonding.

[0056] In some embodiments, the dimensional parameters of the I-shaped cross-section region are illustrated with reference to FIG8. Specifically, the lateral width of the I-shaped region is L1, 2mm≤L1≤5mm; that is, the lateral width of the first base region 111 is L1. This dimension plays an important role in the processing of the explosion-proof valve 11 and the welding of the explosion-proof valve 11 to the cover plate. Setting L1 within the range of 2mm to 5mm ensures that the size of the explosion-proof valve 11 is reasonable and easy to process, and also ensures that the explosion-proof valve 11 is reliably welded to other components of the battery cell (such as the cover plate). This avoids the problem of weak welding between the explosion-proof valve 11 and the cover plate due to an excessively small L1 setting, while also avoiding the problem of large volume and high cost of the explosion-proof valve 11 due to an excessively large L1 setting.

[0057] The lateral distance between the outer edge of the vertical segment of the T-shape and the outer edge of the straight section is L2, where L2 ≥ 0.5L1. This ensures that the vertical segment of the T-shape (i.e., the vertical segment of the I-beam) has a large distance from the outer edge of the explosion-proof valve 11, thereby avoiding the problem that the heat radiation from laser welding of the explosion-proof valve 11 with other components of the battery cell (such as the cover plate) will have an adverse effect on the vertical segment of the I-beam.

[0058] The vertical thickness of the straight section is H3, 0.4mm≤H3≤0.8mm; that is, the thickness of the first substrate area 111 is H3. Setting H3 within the range of 0.4mm to 0.8mm is to ensure good penetration and width during laser welding with other components of the battery cell (such as the cover plate), thereby ensuring the strength of the weld and avoiding the problem of insufficient penetration and width during the welding process due to the size being too small. At the same time, it avoids the problem of the explosion-proof valve 11 being too large along the thickness direction due to the size being too large.

[0059] The transverse width of the vertical segment of the T-shape is L3, and L3 ≥ H3; that is, the transverse width of the vertical segment of the I-beam is L3, and L3 ≥ H3 is set to ensure the structural strength of the I-beam.

[0060] The sum of the vertical heights of the T-shaped and I-shaped structures is H1, where 2mm ≤ H1 ≤ 3mm; that is, the sum of the heights of the boss structure 113 and the first base area 111 is H1, or in other words, the vertical height of the explosion-proof valve 11 is H1. The vertical height of the explosion-proof valve 11 is generally equal to the thickness of the cover plate used to install the explosion-proof valve 11, or slightly less than the thickness of the cover plate, generally 2mm, 3mm, or a value between 2mm and 3mm.

[0061] The vertical thickness of the transverse section of the T-shape is H2, where H2 = H3, or the difference between H2 and H3 is less than 0.05 mm; that is, the vertical thickness of the upper transverse section of the I-beam is H2, and H2 = H3 is set, or the difference between H2 and H3 is less than 0.05 mm. In other words, the vertical thickness of the upper transverse section of the I-beam is set to be equal to or approximately equal to the vertical thickness of the lower transverse section of the I-beam to ensure the symmetrical strength of the I-beam.

[0062] The thickness of the second matrix region 112 is H4, 0.1mm≤H4≤0.2mm. This ensures that the second matrix region 112 has a certain structural strength to withstand a certain blast pressure, and also allows for blast pressure relief when the blast pressure reaches a certain value. This avoids the problem that the structural strength is too poor and the blast pressure that can be withstood is too small if the thickness of the second matrix region 112 is too small. At the same time, it avoids the problem that the thickness of the second matrix region 112 is too large, which would lead to material waste and excessive blast pressure.

[0063] The thickness of the notch 114 in the explosion-proof valve 11 is H5, with a value of 40μm ≤ H5 ≤ 80μm. The thickness of the notch 114 is generally adjusted by processing according to the required burst pressure value and burst area of ​​the battery cell to ensure that the explosion-proof valve 11 has a certain opening pressure. Specifically, the explosion-proof valve 11 can be stamped with a mold to form the notch 114, and then annealed at 150℃ to 200℃ to relieve stress.

[0064] In some embodiments, referring to Figures 7 and 8, the upper end of the vertical segment of the T-shape forms a first smooth transition fillet between its two sides along the horizontal direction and the lower end face of the horizontal segment of the T-shape, that is, the two are connected by a rounded transition; the lower end of the vertical segment of the T-shape forms a second smooth transition fillet between its two sides along the horizontal direction and the upper end face of the straight line, that is, the two are connected by a rounded transition. Referring to Figure 8, R in the figure... n The rounded corners are used to relieve stress during cold working, thereby ensuring that the explosion-proof valve 11 has high structural strength.

[0065] It should be noted that the dimensional parameters of the I-shaped cross-section area are not limited to the specific limitations mentioned above, and can be reasonably set and adjusted according to actual needs.

[0066] Furthermore, along the thickness direction of the first base region 111, the cross-section of the boss structure 113 and the first base region 111 is not limited to being constructed in an I-shape. That is to say, the part of the first base region 111 where the boss structure 113 is provided and the cross-section of the boss structure 113 along the thickness direction of the first base region 111 are not limited to being constructed in an I-shape. They can also be constructed in other shapes such as C-shape, Z-shape or S-shape, as long as they can enhance the structural strength and reduce the stress at the notch 114.

[0067] Vibration tests were simulated on a battery pack using the explosion-proof valve 11 disclosed in this application and a battery pack using a conventional explosion-proof valve 11. The simulation results showed that the simulated stress of the conventional explosion-proof valve 11 was -34.66 MPa, while the simulated stress of the explosion-proof valve 11 disclosed in this application was -31.81 MPa. Compared with the conventional explosion-proof valve, the explosion-proof valve 11 proposed in this application can reduce the stress by 2.85 MPa, which is an improvement of 8.22%.

[0068] Referring to Figures 2 to 7, some other embodiments of this application disclose a battery cell including an explosion-proof valve 11 as described in any of the above embodiments, and thus having the beneficial effects of the explosion-proof valve 11 as described in any of the above embodiments.

[0069] In some embodiments, referring to Figures 6 and 7, the battery cell includes a cover plate body 15, on which a mounting through hole 151 is formed, and an explosion-proof valve 11 is installed at the mounting through hole 151. Optionally, a limiting groove 152 is formed on the inner wall of the mounting through hole 151, and at least a portion of the circumferential edge of the explosion-proof valve 11 is limited within the limiting groove 152, and the circumferential edge of the explosion-proof valve 11 is welded and fixed to the cover plate body 15. This arrangement allows the explosion-proof valve 11 to be limited within the mounting through hole 151 on the cover plate body 15 by the cooperation of the limiting groove 152 and the circumferential edge of the explosion-proof valve 11, thereby facilitating laser welding operations between the two.

[0070] In some embodiments, referring to Figures 6 and 7, the shape of the limiting groove 152 formed on the inner wall of the mounting through hole 151 is adapted to the shape of the circumferential edge of the explosion-proof valve 11. Specifically, the shape of the limiting groove 152 is adapted to the shape of the outer edge of the I-beam formed by the first base region 111 of the explosion-proof valve 11 and the boss structure 113 provided in the first base region 111. The limiting groove 152 specifically includes a first recess corresponding to the outer edge of the upper transverse section of the I-beam and a second recess corresponding to the outer edge of the lower transverse section of the I-beam. A protrusion corresponding to the outer edge of the vertical section of the I-beam is formed between the first recess and the second recess. The outer edge of the I-beam is limited within the limiting groove 152. This arrangement is to limit the circumferential edge of the explosion-proof valve 11 within the limiting groove 152 to facilitate subsequent laser welding operations.

[0071] During assembly, the explosion-proof valve 11 can be installed into the mounting through hole 151 by extrusion, so that the circumferential edge of the explosion-proof valve 11 is inserted into the limiting groove 152 formed on the inner wall of the mounting through hole 151; alternatively, the base area (including the first base area 111 and the second base area 112) and the boss structure 113 of the explosion-proof valve 11 can be divided into two parts. First, the base area of ​​the explosion-proof valve 11 is welded and fixed to the mounting through hole 151, and then the boss structure 113 is fixed at the corresponding position of the second base area 112 of the explosion-proof valve 11.

[0072] In one specific embodiment, referring to Figures 2 to 7, the battery cell includes a battery cell cover plate 1, which includes a terminal post 12, a sealing ring 13, a lower plastic 14, a cover plate body 15, an upper plastic 16, a riveting block 17, an explosion-proof valve 11, an explosion-proof valve patch 18, and other structures.

[0073] The lower plastic 14 is located below the cover plate body 15, and the upper plastic 16 is located above the cover plate body 15. The riveting block 17 is installed on the upper plastic 16. The lower plastic 14 has a first through hole, the cover plate has a first mounting hole corresponding to the first through hole, and the upper plastic 16 has a second mounting hole corresponding to the first mounting hole. The pole post 12 passes through the first through hole, the first mounting hole, and the second mounting hole and is fixed to the riveting block 17. The sealing ring 13 is sleeved on the pole post 12. The cover plate body 15 has a mounting through hole 151, the explosion-proof valve 11 is installed at the mounting through hole 151, and is fixed to the cover plate body 15 by laser welding. The explosion-proof valve patch 18 is installed on the explosion-proof valve 11.

[0074] Specifically, the pole post 12 can be made of 1-series pure aluminum, the sealing ring 13 can be made of fluororubber, the lower plastic 14 can be made of PP, the cover plate body 15 can be made of light aluminum sheet, the light aluminum sheet can be made of 3-series Al-Mn alloy, the upper plastic 16 can be made of PPS mixed with glass fiber, the riveting block 17 can be made of 1-series aluminum alloy, the explosion-proof valve 11 can be made of MFX-2 aluminum alloy, and the explosion-proof valve patch 18 can be made of PET material.

[0075] Further embodiments of this application disclose a battery pack that includes an explosion-proof valve as described in any of the above embodiments, or includes a battery cell as described in any of the above embodiments, thus having the beneficial effects of the explosion-proof valve or battery cell of any of the above embodiments, which will not be repeated here.

[0076] Further embodiments of this application disclose a vehicle including a battery pack as described in any of the above embodiments, thus possessing the beneficial effects of the battery packs described in any of the above embodiments, which will not be repeated here.

[0077] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0078] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. An explosion-proof valve comprising a first base region and a second base region; the first base region is arranged around a circumferential edge of the second base region, and a thickness of the first base region is greater than a thickness of the second base region, the second base region being provided with a score; the first base region has a first surface and a second surface opposite along a thickness direction, the first surface being provided with a boss structure, the boss structure being located at a periphery of the score.

2. The explosion relief valve of claim 1, wherein, the first base region is in a shape of a racetrack, the first base region comprising a first arc region and a second arc region arranged oppositely; the boss structure comprises a first boss and a second boss, the first boss being arranged in the first arc region and extending along a circumference of the first arc region, the second boss being arranged in the second arc region and extending along a circumference of the second arc region.

3. The explosion relief valve of claim 1 or 2, wherein, along the thickness direction of the first base region, a cross section of the boss structure and the first base region is jointly configured in a shape of an H-beam, a C, a Z or an S.

4. The explosion relief valve of claim 3, wherein, along the thickness direction of the first base region, a cross section of the boss structure is in a shape of a T, and a cross section of the first base region is in a shape of a straight line; a lower end of the T is connected with a middle portion of an upper surface of the straight line to jointly configure an H-beam.

5. The explosion relief valve of claim 4, wherein, a transverse width of the straight line is L1, 2mm≤L1≤5mm; a transverse distance from an outer edge of the straight line to an outer edge of a vertical segment of the T is L2, L2≥0.5L1.

6. The explosion relief valve of claim 4, wherein, a vertical thickness of the straight line is H3, 0.4mm≤H3≤0.8mm; a transverse width of the vertical segment of the T is L3, L3≥H3.

7. The explosion relief valve of claim 4 wherein, a sum of vertical heights of the T and the straight line is H1, 2mm≤H1≤3mm; a vertical thickness of the straight line is H3, 0.4mm≤H3≤0.8mm; a vertical thickness of the transverse segment of the T is H2, H2=H3, or a difference between H2 and H3 is less than 0.05mm.

8. The explosion relief valve of claim 4 wherein, a first smooth transition fillet is formed between upper ends of the vertical segment of the T and a lower end surface of the transverse segment of the T along two sides in a transverse direction respectively; a second smooth transition fillet is formed between lower ends of the vertical segment of the T and an upper end surface of the straight line along two sides in a transverse direction respectively.

9. A battery pack comprising the explosion-proof valve according to any one of claims 1 to 8.

10. A vehicle comprising the battery pack according to claim 9.

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