Explosion-proof valve, battery cell, battery pack and vehicle

Abstract

The utility model relates to the technical field of batteries, and provides an anti-explosion valve, a battery cell, a battery pack and a vehicle. The anti-explosion valve comprises a first base body area and a second base body area. The first base body area is arranged on the circumferential edge of the second base body area in a surrounding mode, the thickness of the first base body area is larger than that of the second base body area, and nicks are formed in the second base body area; the first substrate area is provided with a first surface and a second surface which are opposite in the thickness direction, the first surface is provided with a boss structure, and the boss structure is located on the periphery of the nick. According to the explosion-proof valve provided by the utility model, the boss structure is arranged, so that the structural strength of the explosion-proof valve is enhanced, the stress at the weak part of the explosion-proof valve is reduced, the metal fatigue is relieved, and the impact force generated in the vibration test process can be absorbed by utilizing the boss structure in the vibration test process of the battery pack; therefore, the acting force transmitted to the nick of the explosion-proof valve is reduced, the risk of fatigue fracture at the nick is reduced, and the risk of liquid leakage of the battery pack is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an explosion-proof valve, an electric core, a battery pack and a vehicle. Background Art

[0002] Generally, explosion-proof valves are designed for square / blade lithium batteries to release the internal pressure by opening the valve under the thermal runaway of the electric core. The position of the explosion-proof valve should not only meet the requirements of opening the valve, but also meet the requirements of sealing performance and the reliability requirements for long-term use. In order to meet the requirements of opening pressure, the explosion-proof valve is usually designed to be relatively thin, and the remaining thickness of the notch of the explosion-proof valve is generally about 40-100 μm.

[0003] In order to ensure the reliability of the battery pack during use, vibration tests are generally carried out on the battery pack to simulate the vibration during vehicle driving. The battery pack will experience vibrations in three directions of X, Y and Z during the test. However, due to reasons such as metal fatigue, the weak position of the explosion-proof valve is prone to fatigue fracture during the vibration test, resulting in liquid leakage of the battery pack. Summary of the Utility Model

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the utility model provides an explosion-proof valve, an electric core, a battery pack and a vehicle.

[0005] In a first aspect of the utility model, an explosion-proof valve is provided, which includes a first base area and a second base area;

[0006] The first base area is circumferentially arranged around the circumferential edge of the second base area, and the thickness of the first base area is greater than the thickness of the second base area. The second base area is provided with a notch;

[0007] The first base area has a first surface and a second surface opposite to each other in the thickness direction. The first surface is provided with a boss structure, and the boss structure is located outside the notch.

[0008] In some embodiments, the first base area is in a runway shape, and the first base area includes a first arc area and a second arc area arranged oppositely;

[0009] The boss structure includes a first boss and a second boss. The first boss is arranged on the first arc area and extends along the circumferential direction of the first arc area, and the second boss is arranged on the second arc area and extends along the circumferential direction of the second arc area.

[0010] In some embodiments, along the thickness direction of the first base area, the cross section of the boss structure and the first base area together form an I shape, a C shape, a Z shape or an S shape.

[0011] In some embodiments, along the thickness direction of the first base region, the cross-section of the boss structure is T-shaped, and the cross-section of the first base region is linear;

[0012] The lower end of the T-shape is connected to the middle of the upper surface of the linear shape to jointly form a capital-I shape.

[0013] In some embodiments, the lateral width of the linear shape is L1, where 2 mm ≤ L1 ≤ 5 mm;

[0014] The lateral distance from the outer edge of the vertical section of the T-shape to the outer edge of the linear shape is L2, and L2 ≥ 0.5L1.

[0015] In some embodiments, the vertical thickness of the linear shape is H3, where 0.4 mm ≤ H3 ≤ 0.8 mm;

[0016] The lateral width of the vertical section of the T-shape is L3, and L3 ≥ H3.

[0017] In some embodiments, the sum of the heights of the T-shape and the linear shape in the vertical direction is H1, where 2 mm ≤ H1 ≤ 3 mm;

[0018] The vertical thickness of the linear shape is H3, where 0.4 mm ≤ H3 ≤ 0.8 mm;

[0019] The vertical thickness of the lateral section of the T-shape is H2, where H2 = H3, or the difference between H2 and H3 is less than 0.05 mm.

[0020] The second aspect of the present utility model provides an electric core, including the explosion-proof valve as described in any one of the above embodiments.

[0021] The third aspect of the present utility model provides a battery pack, including the electric core as described in any one of the above embodiments.

[0022] The fourth aspect of the present utility model provides a vehicle, including the battery pack as described in the above embodiments.

[0023] The technical solution provided by the present utility model has the following advantages compared with the prior art:

[0024] The explosion-proof valve, battery cell, battery pack and vehicle provided by the present utility model. The explosion-proof valve includes a first base region and a second base region. 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 that of the second base region. The second base region is provided with a notch to achieve reliable installation of the explosion-proof valve on the battery cell through the relatively thick first base region. By providing a notch on the relatively thin second base region, it is convenient for the explosion-proof valve to burst and relieve pressure from the notch when under pressure, so as to achieve the purpose of explosion protection. The first base region has a first surface and a second surface opposite to each other in the thickness direction. The first surface is provided with a boss structure, and the boss structure is located outside the notch. By providing the boss structure, the structural strength of the explosion-proof valve is enhanced, the stress at the weak part 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 outside the notch can be used to absorb the impact force generated during the vibration test, thereby reducing the force transmitted to the notch of the explosion-proof valve, that is, reducing the impact on the notch of the explosion-proof valve, and thus reducing the risk of fatigue fracture occurring at the notch of the explosion-proof valve during the vibration test, and further effectively reducing the risk of battery pack leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present utility model and, together with the specification, are used to explain the principles of the present utility model.

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 is a schematic structural diagram of the explosion-proof valve according to an embodiment of the present utility model;

[0028] Figure 2 is a three-dimensional structural diagram of the battery cell cover plate according to an embodiment of the present utility model;

[0029] Figure 3 is an exploded structural diagram of the battery cell cover plate according to an embodiment of the present utility model;

[0030] Figure 4 is a top view structural diagram of the battery cell cover plate according to an embodiment of the present utility model;

[0031] Figure 5 is Figure 4 the cross-sectional structural diagram in the A-A direction in

[0032] Figure 6 is Figure 5Schematic diagram of the partially enlarged structure of part B;

[0033] Figure 7 is Figure 6 Schematic diagram of the partially enlarged structure of part C;

[0034] Figure 8 Schematic diagram of the dimensional parameters of the partial structure of the explosion-proof valve according to an embodiment of the present invention.

[0035] Wherein, 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. notch; 12. pole column; 13. sealing ring; 14. lower plastic; 15. cover plate main body; 151. installation through hole; 152. limiting groove; 16. upper plastic; 17. riveting block; 18. explosion-proof valve patch. Detailed implementation manners

[0036] In order to more clearly understand the above objects, features and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0037] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, rather than all the embodiments.

[0038] Referring to Figures 1 to 8 As shown, some embodiments of the present invention provide an explosion-proof valve 11, which can be installed on products such as battery packs, and specifically can be installed on the cells of the battery pack to perform blasting and pressure relief in time when an abnormality occurs inside the cell, so as to achieve the purpose of explosion prevention. Of course, the explosion-proof valve 11 is not limited to being applied to battery packs, and can also be applied to other products with explosion-proof requirements as needed.

[0039] Referring to Figure 1 As shown, the explosion-proof valve 11 provided by some embodiments of the present invention includes a first base area 111 and a second base area 112. The first base area 111 is disposed around the circumferential edge of the second base area 112, and the thickness of the first base area 111 is greater than the thickness of the second base area 112. The second base area 112 is provided with a notch 114. With such a setting, the reliable installation of the explosion-proof valve 11 on the cell is realized through the relatively thick first base area 111, and the notch 114 is provided on the relatively thin second base area 112 to facilitate the explosion-proof valve 11 to perform blasting and pressure relief from the notch 114 when under pressure, so as to achieve the purpose of explosion prevention.

[0040] It should be noted that, in order to achieve the purpose of explosion-proof pressure relief, the second base region 112 of the explosion-proof valve 11 is usually set as a relatively thin membrane-like shape, and the second base region 112 is provided with a notch 114, and the remaining thickness at the notch 114 is thinner, so that the explosion-proof valve 11 can burst and relieve pressure from the notch 114 when subjected to pressure; 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 first base region 111 is formed into a structure similar to a skirt for welding and fixing with other components (such as a cover plate) of the battery cell to achieve reliable installation of the explosion-proof valve 11 on the battery cell.

[0041] Wherein, the first base region 111 has a first surface and a second surface opposite to each other in the thickness direction, and the first surface is provided with a boss structure 113, and the boss structure 113 is located outside the notch 114. Refer to Figure 1 As shown, the vertically upward arrow in the figure indicates the thickness direction of the first base region 111.

[0042] For the explosion-proof valve 11 provided by the embodiment of the present invention, by providing the boss structure 113 on the first surface of the first base region 111 in the thickness direction, and the boss structure 113 is located outside the notch 114, the structural strength of the explosion-proof valve 11 is enhanced by providing the boss structure 113, the stress at the weak part of the explosion-proof valve 11 is reduced, and the metal fatigue is alleviated. During the vibration test of the battery pack, the boss structure 113 located outside the notch 114 can be used to absorb the impact force generated during the vibration test, thereby reducing the acting force transmitted to the notch 114 of the explosion-proof valve 11, that is, reducing the impact at the notch 114 of the explosion-proof valve 11, thereby reducing the risk of fatigue fracture at the notch 114 of the explosion-proof valve 11 during the vibration test, and further effectively reducing the risk of battery pack leakage.

[0043] In some embodiments, refer to Figure 1 As shown, the first base region 111 is in a runway shape, and the first base region 111 includes a first arc region and a second arc region arranged oppositely; the boss structure 113 includes a first boss 1131 and a second boss 1132. The first boss 1131 is disposed on the first arc region and extends along the circumferential direction of the first arc region, and the second boss 1132 is disposed on the second arc region and extends along the circumferential direction of the second arc region.

[0044] That is to say, along the circumferential direction of the first base region 111, the first boss 1131 is formed into an arc-shaped boss adapted to the shape of the first arc region, and the second boss 1132 is formed into an arc-shaped boss adapted to the shape of the second arc region. By such a setting, the arc-shaped regions at both ends of the first base region 111 are structurally strengthened through the first boss 1131 and the second boss 1132.

[0045] Exemplarily, taking a square / blade lithium battery as an example, in actual use, the explosion-proof valve 11 is usually vertically installed on the battery cell of the battery pack in an upright state. Refer to Figure 1 As shown, the arrow inclined upward in the figure indicates the upright direction of the explosion-proof valve 11. The first arc area and the second arc area of the explosion-proof valve 11 are arranged oppositely along the upright direction. During the vibration test of the battery pack, the vibration of the battery pack along the upright direction is relatively obvious, and the pulling force in the upright direction on the notch 114 of the explosion-proof valve 11 is relatively large. For the explosion-proof valve 11 provided in the embodiment of the present invention, by respectively arranging the first boss 1131 and the second boss 1132 in the first arc area and the second arc area of the first base area 111, that is, by respectively arranging the first boss 1131 and the second boss 1132 at both ends of the first base area 111 along the upright direction, the structural strength of both ends of the first base area 111 along the upright direction is enhanced, so as to well absorb the impact force generated in the upright direction due to vibration, thereby reducing the impact force transmitted to the notch 114 of the explosion-proof valve 11, and further reducing the risk of fatigue fracture occurring at the notch 114 of the explosion-proof valve 11 during the vibration test.

[0046] It should be noted that in actual setting, it is not limited to only arranging the boss structure 113 at both ends of the first base area 111 along the upright direction to strengthen the structure of both ends of the first base area 111 along the upright direction. Other parts of the first base area 111 can also be structurally strengthened as needed. Exemplarily, the boss structure 113 is arranged on the entire circumference of the first base area 111, that is, the boss structure 113 is an annular boss structure 113 arranged along the circumferential direction of the first base area 111; or, the boss structure 113 is arranged correspondingly according to the setting position of the notch 114. The notch 114 is arranged as a non-closed annular structure, and correspondingly, the boss structure 113 is also arranged as a non-closed annular structure.

[0047] In addition, the first base area 111 is not limited to being runway-shaped. The first base area 111 can also be other shapes such as circular ring-shaped. Similarly, the boss structure 113 can be arranged at both ends of the first base area 111 along the upright direction to strengthen the structure; and it is not limited to only strengthening the structure of both ends of the first base area 111 along the upright direction. Other parts of the first base area 111 can also be structurally strengthened as needed. As long as it does not deviate from the design concept of the present invention, it should be within the protection scope of the present invention.

[0048] In some embodiments, refer to Figure 1 、 Figure 6 、 Figure 7 and Figure 8As shown, along the thickness direction of the first substrate area 111, the boss structure 113 and the cross section of the first substrate area 111 are jointly configured into an I-shape. In other words, the portion of the first substrate area 111 provided with the boss structure 113 and the cross section of the boss structure 113 along the thickness direction of the first substrate area 111 are jointly configured into an I-shape. With such a configuration, the first substrate area 111 and the boss structure 113 provided thereon are in the shape of an I-beam from the appearance, which is similar to the shape of a building steel beam or a train track steel beam. The I-beam structure has a simple structure, high structural strength, good stability, and good fatigue resistance. In battery pack and vehicle applications, it can reduce the metal fatigue failure problem caused by vibration, and improve the reliability and safety performance of the battery pack and the vehicle.

[0049] It should be understood that the “cross-section along the thickness direction of the first base area 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 area and the second arc-shaped area of ​​the first base area 111, refers to the cross-section along the thickness direction of the first base and passing through the radius of the first arc-shaped area (or the second arc-shaped area).

[0050] In some embodiments, reference Figure 1 , Figure 6 , Figure 7 and Figure 8 As shown, along the thickness direction of the first substrate area 111, the cross-section of the boss structure 113 is T-shaped, and the cross-section of the first substrate area 111 is I-shaped; specifically, along the thickness direction of the first substrate area 111, the cross-section of the boss structure 113 is T-shaped, and the cross-section of the portion of the first substrate area 111 where the boss structure 113 is provided is I-shaped; the lower end of the T-shape is connected to the middle part of the upper surface of the I-shape to jointly construct an I-shape.

[0051] In this way, the boss structure 113 provided on the first base area 111 is in the shape of a T-beam from the appearance, and together with the part of the first base area 111 provided with the boss structure 113, it forms an I-beam shape; in specific processing, on the basis of the structure of the original explosion-proof valve 11, an additional T-shaped boss structure 113 can be provided on the first surface of the first base area 111 of the explosion-proof valve 11. Specifically, the boss structure 113 can be integrally formed with the first base area 111, or can be installed and fixed to the first base area 111 as an independent component, for example, by welding or bonding.

[0052] In some embodiments, reference Figure 8As shown, the dimensional parameters of the I-shaped cross-section area are illustrated. Specifically, the horizontal width of the straight bar shape is L1, where 2 mm ≤ L1 ≤ 5 mm; that is, the horizontal 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. By setting L1 within the range of 2 mm - 5 mm, it not only ensures the reasonable size of the explosion-proof valve 11 and convenient processing, but also ensures reliable welding between the explosion-proof valve 11 and other components of the battery cell (such as the cover plate), avoiding the problem of insecure welding between the explosion-proof valve 11 and the cover plate caused by too small L1. At the same time, it avoids problems such as large volume and high cost of the explosion-proof valve 11 caused by too large L1.

[0053] The horizontal distance from the outer edge of the vertical section of the T shape to the outer edge of the straight bar shape is L2, and L2 ≥ 0.5L1, to ensure that the vertical section of the T shape (i.e., the vertical section of the I-beam) has a relatively large distance from the outer edge of the explosion-proof valve 11, thus avoiding the problem that the heat radiation during laser welding between the explosion-proof valve 11 and other components of the battery cell (such as the cover plate) has an adverse effect on the vertical section of the I-beam.

[0054] The vertical thickness of the straight bar shape is H3, where 0.4 mm ≤ H3 ≤ 0.8 mm; that is, the thickness of the first base region 111 is H3. By setting H3 within the range of 0.4 mm - 0.8 mm, it is used to ensure good penetration and bead width during laser welding with other components of the battery cell (such as the cover plate), thus ensuring the firmness of the welding, avoiding the problem of insufficient penetration and bead width during welding caused by too small a size, and at the same time, avoiding the problem of too large a size of the explosion-proof valve 11 in the thickness direction.

[0055] The horizontal width of the vertical section of the T shape is L3, and L3 ≥ H3; that is, the horizontal width of the vertical section of the I-beam is L3. By setting L3 ≥ H3, it is to ensure the structural strength of the I-beam.

[0056] The sum of the vertical heights of the T shape and the straight bar shape is H1, where 2 mm ≤ H1 ≤ 3 mm; that is, the sum of the heights of the boss structure 113 and the first base region 111 is H1, or rather, the vertical height of the explosion-proof valve 11 is H1. The vertical height of the explosion-proof valve 11 generally equals the thickness value of the cover plate used to install the explosion-proof valve 11, or is slightly less than the thickness value of the cover plate, generally 2 mm, 3 mm, or a value between 2 mm and 3 mm.

[0057] The vertical thickness of the horizontal section of the T shape is H2, and H2 = H3, or the difference between H2 and H3 is less than 0.05 mm; that is, the vertical thickness of the upper horizontal section of the I-beam is H2. By setting H2 = H3, or the difference between H2 and H3 is less than 0.05 mm, that is, setting the vertical thickness of the upper horizontal section of the I-beam and the vertical thickness of the lower horizontal section of the I-beam to be equal or approximately equal, to ensure the symmetrical strength of the I-beam.

[0058] The thickness of the second base region 112 is H4, where 0.1 mm ≤ H4 ≤ 0.2 mm. This not only ensures that the second base region 112 has a certain structural strength and can withstand a certain bursting pressure, but also enables it to burst and relieve pressure when the bursting pressure reaches a certain value. This avoids the problem that if the thickness of the second base region 112 is too small, the structural strength will be too poor and the bursting pressure it can withstand will be too small. At the same time, it avoids the problems of material waste and excessive required bursting pressure caused by too large a thickness of the second base region 112.

[0059] The thickness of the notch 114 of the explosion-proof valve 11 is H5, where 40 μm ≤ H5 ≤ 80 μm. The thickness of the notch 114 is generally processed and adjusted according to the required bursting pressure value and bursting 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 by a mold to form the notch 114, and then annealed at 150°C - 200°C to relieve stress.

[0060] In some embodiments, referring to Figure 7 and Figure 8 as shown, a first smooth transition fillet is formed between the upper end of the vertical section of the T-shape and the lower end surfaces on both sides in the horizontal direction of the horizontal section of the T-shape, that is, a fillet transition connection is used between them; a second smooth transition fillet is formed between the lower end of the vertical section of the T-shape and the upper end surfaces on both sides in the horizontal direction of the one-shape, that is, a fillet transition connection is used between them. Referring to Figure 8 as shown, the R n in the figure represents fillet treatment, which is used to relieve stress during cold processing, thereby ensuring that the explosion-proof valve 11 has a high structural strength.

[0061] It should be noted that the dimensional parameters of the I-shaped cross-section area are not limited to the above specific limitations and can also be reasonably set and adjusted according to actual needs.

[0062] In addition, along the thickness direction of the first base region 111, the cross-sections of the boss structure 113 and the first base region 111 are not limited to jointly forming an I-shape. That is to say, the cross-sections along the thickness direction of the part of the first base region 111 where the boss structure 113 is provided and the boss structure 113 are not limited to jointly forming an I-shape, and can also jointly form other shapes such as a C-shape, a Z-shape, or an S-shape, as long as they can enhance the structural strength and reduce the stress at the notch 114.

[0063] The battery packs using the explosion-proof valve 11 provided by the present utility model and the battery packs using the existing explosion-proof valve 11 are respectively subjected to vibration test simulation. Through the simulation comparison results, the simulation stress of the existing explosion-proof valve 11 is -34.66 MPa, and the simulation stress of the explosion-proof valve 11 provided by the present utility model is -31.81 MPa. The explosion-proof valve 11 proposed by the present utility model can reduce the stress by 2.85 MPa compared with the existing explosion-proof valve 11, with an optimization improvement of 8.22%.

[0064] Referring to Figures 2 to 7 As shown, some other embodiments of the present utility model provide an electric core, including the explosion-proof valve 11 in any of the above embodiments, and thus have the beneficial effects of the explosion-proof valve 11 in any of the above embodiments.

[0065] In some embodiments, referring to Figure 6 and Figure 7 As shown, the electric core includes a cover plate main body 15. An installation through hole 151 is formed on the cover plate main body 15, and the explosion-proof valve 11 is installed at the installation through hole 151. Further, a limiting groove 152 is formed on the inner wall of the installation through hole 151. At least a part of the circumferential edge of the explosion-proof valve 11 is limited in the limiting groove 152, and the circumferential edge of the explosion-proof valve 11 is fixedly welded to the cover plate main body 15. With such a setting, the explosion-proof valve 11 is limited in the installation through hole 151 formed on the cover plate main body 15 by the cooperation of the limiting groove 152 and the circumferential edge of the explosion-proof valve 11, so as to facilitate the laser welding operation of the two.

[0066] Exemplarily, referring to Figure 6 and Figure 7 As shown, the shape of the limiting groove 152 formed on the inner wall of the installation 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 outer edge shape of the I-beam jointly formed by the first base area 111 of the explosion-proof valve 11 and the boss structure 113 provided on the first base area 111. The limiting groove 152 specifically includes a first recess corresponding to the outer edge of the upper horizontal section of the I-beam and a second recess corresponding to the outer edge of the lower horizontal section of the I-beam. A protruding part 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 in the limiting groove 152. With such a setting, the circumferential edge of the explosion-proof valve 11 is limited in the limiting groove 152 to facilitate the subsequent laser welding operation.

[0067] During specific assembly, the explosion-proof valve 11 can be installed at the installation through-hole 151 by extrusion, and the circumferential edge of the explosion-proof valve 11 is snapped into the limiting groove 152 formed on the inner wall of the installation 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 at the installation 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.

[0068] In a specific embodiment, referring to Figures 2 to 7 as shown, the battery cell includes a battery cell cover plate 1, and the battery cell cover plate 1 includes structures such as a pole column 12, a sealing ring 13, a lower plastic 14, a cover plate main body 15, an upper plastic 16, a riveting block 17, an explosion-proof valve 11, an explosion-proof valve patch 18, etc.

[0069] Among them, the lower plastic 14 is arranged below the cover plate main body 15, the upper plastic 16 is arranged above the cover plate main body 15, the riveting block 17 is installed on the upper plastic 16. A first through-hole is opened on the lower plastic 14, a first installation hole corresponding to the first through-hole is opened on the cover plate, a second installation hole corresponding to the first installation hole is opened on the upper plastic 16. The pole column 12 passes through the first through-hole, the first installation hole and the second installation hole and is fixed to the riveting block 17. The sealing ring 13 is sleeved on the pole column 12; an installation through-hole 151 is opened on the cover plate main body 15, and the explosion-proof valve 11 is installed at the installation through-hole 151 and is fixed to the cover plate main body 15 by laser welding; the explosion-proof valve patch 18 is covered on the explosion-proof valve 11.

[0070] Specifically, the material of the pole column 12 can be 1-series pure aluminum, the material of the sealing ring 13 can be fluororubber, the material of the lower plastic 14 can be PP, the cover plate main body 15 can be a bright aluminum sheet, and the material of the bright aluminum sheet can be 3-series Al-Mn alloy. The material of the upper plastic 16 can be PPS mixed with glass fiber, the material of the riveting block 17 can be 1-series aluminum alloy, the material of the explosion-proof valve 11 can be mfx-2 aluminum alloy, and the explosion-proof valve patch 18 can be made of PET material.

[0071] Some other embodiments of the present invention provide a battery pack, including the battery cell of any of the above embodiments, and thus having the beneficial effects of the battery cell of any of the above embodiments, which will not be elaborated here.

[0072] Some other embodiments of the present invention provide a vehicle, including the battery pack of any of the above embodiments, and thus having the beneficial effects of the battery pack of any of the above embodiments, which will not be elaborated here.

[0073] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0074] The above are only specific embodiments of the present utility model, enabling those skilled in the art to understand or implement the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments described herein, but rather will conform to the widest scope consistent with the principles and novel features of the present utility model described herein.

Claims

1. An explosion-proof valve, characterized in that: including a first substrate region and a second substrate region; The first base area is arranged around the circumferential edge of the second base area, the thickness of the first base area is greater than the thickness of the second base area, and the second base area is provided with notches; The first base region has a first surface and a second surface that are opposite to each other along a thickness direction. The first surface is provided with a boss structure, and the boss structure is located at the periphery of the notch.

2. The explosion-proof valve according to claim 1, characterized in that: The first base area is in a racetrack shape, and the first base area includes a first arc area and a second arc area that are arranged opposite to each other; The boss structure includes a first boss and a second boss. The first boss is disposed in the first arc-shaped area and extends along the circumference of the first arc-shaped area. The second boss is disposed in the second arc-shaped area and extends along the circumference of the second arc-shaped area.

3. The explosion-proof valve according to claim 1 or 2, characterized in that: Along the thickness direction of the first base region, the boss structure and the cross section of the first base region are jointly configured into an I-shape, a C-shape, a Z-shape or an S-shape.

4. The explosion-proof valve according to claim 3, characterized in that: Along the thickness direction of the first base area, the cross section of the boss structure is T-shaped, and the cross section of the first base area is I-shaped; The lower end of the T-shape is connected to the middle portion of the upper surface of the I-shape to form an I-shape together.

5. The explosion-proof valve according to claim 4, characterized in that: The horizontal width of the straight line is L1, 2mm≤L1≤5mm; The lateral distance between the outer edge of the vertical segment of the T-shape and the outer edge of the I-shape is L2, and L2≥0.5L1.

6. The explosion-proof valve according to claim 4, characterized in that: The vertical thickness of the straight shape is H3, 0.4mm≤H3≤0.8mm; The transverse width of the T-shaped vertical section is L3, and L3≥H3.

7. The explosion-proof valve according to claim 4, characterized in that: The sum of the vertical heights of the T-shape and the I-shape is H1, 2mm≤H1≤3mm; The vertical thickness of the straight shape is H3, 0.4mm≤H3≤0.8mm; The vertical thickness of the T-shaped transverse section is H2, H2=H3, or the difference between H2 and H3 is less than 0.05 mm.

8. A battery cell, characterized in that: Comprising the explosion-proof valve according to any one of claims 1 to 7.

9. A battery pack, characterized in that: Comprising the battery cell as claimed in claim 8.

10. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 9.

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