Anti-explosion valve, battery cover plate, cover plate assembly, battery, battery pack and electric equipment

Abstract

The utility model discloses an explosion-proof valve, battery cover plate, cover plate subassembly, battery, battery pack and electric equipment wherein the explosion-proof valve includes: valve main part, valve main part is equipped with trigger part, one side of valve main part is equipped with connecting part, connecting part is located the periphery of trigger part, connecting part is configured to be convex structure; the battery cover plate comprises a cover plate main body, the cover plate main body is provided with an explosion-proof hole, a first side of the cover plate main body is provided with a connecting part, the connecting part is located on the periphery of the explosion-proof hole, and the connecting part is configured to be of a protruding structure. According to the anti-explosion valve and the battery cover plate disclosed by the utility model, the connecting part is arranged, so that the anti-explosion valve and the battery cover plate can be connected together through the connecting part, and the stability and the firmness of the connection quality of the anti-explosion valve and the battery cover plate can be improved; and the arranged connecting part is beneficial to subsequent connection of the explosion-proof valve and the battery cover plate by adopting other welding modes.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to an explosion-proof valve, a battery cover plate, a cover plate assembly, a battery, a battery pack and an electrical equipment. Background Art

[0002] In the technical field of batteries, an explosion-proof valve is a key safety component designed to rupture when the internal pressure of the battery is too high, thereby releasing the pressure and preventing the battery from exploding. However, the existing connection method between the explosion-proof valve and the battery cover plate is mainly achieved through laser welding technology.

[0003] When laser welding the explosion-proof valve and the battery cover plate, the laser performs fusion welding around the weld seam. During this process, a large amount of foreign matter splashes will be generated. However, laser welding is extremely sensitive to foreign matter in the manufacturing process, and the weld seam is prone to welding defects such as false welding. Moreover, any tiny impurity or pollutant may affect the welding quality and sealing performance. This not only increases the difficulty of quality control in the production process, but also may lead to a decrease in the welding yield, unstable connection quality, and inability to ensure the reliability of the connection between the explosion-proof valve and the battery cover plate. In addition, laser welding equipment is relatively expensive and has high maintenance costs, which undoubtedly increases the production cost of the battery. Summary of the Utility Model

[0004] The first object of the utility model is to provide a new technical solution for an explosion-proof valve, which can at least solve the technical problem of unstable connection quality between the existing explosion-proof valve and the battery cover plate.

[0005] The second object of the utility model is to provide a new technical solution for a battery cover plate, which can at least solve the technical problem of unstable welding quality between the existing explosion-proof valve and the battery cover plate.

[0006] The third object of the utility model is to provide a new technical solution for a cover plate assembly.

[0007] The fourth object of the utility model is to provide a new technical solution for a battery.

[0008] The fifth object of the utility model is to provide a new technical solution for a battery pack.

[0009] The sixth object of the utility model is to provide a new technical solution for an electrical equipment.

[0010] According to the first aspect of the utility model, there is provided an explosion-proof valve, comprising: a valve body, the valve body is provided with a trigger part, one side of the valve body is provided with a connecting part, the connecting part is located on the outer periphery of the trigger part, and the connecting part is configured as a convex structure.

[0011] Optionally, the connecting part is formed as an annular protrusion surrounding the trigger part.

[0012] Optionally, the connecting portion is a resistance welding portion.

[0013] Optionally, the valve body is configured as a sheet body.

[0014] Optionally, a first end of the connecting portion is connected to the valve body, and a dimension of a cross-section of a second end of the connecting portion in a radial direction of the valve body in a plane where the radial direction of the valve body is located is smaller than a dimension of a cross-section of the first end of the connecting portion in the radial direction of the valve body in the plane where the radial direction of the valve body is located.

[0015] Optionally, the dimension of the cross-section of the connecting portion in the radial direction of the valve body in the plane where the radial direction of the valve body is located gradually decreases from the first end of the connecting portion to the second end of the connecting portion.

[0016] Optionally, a plurality of the connecting portions are provided on one side of the valve body, and the plurality of connecting portions are spaced apart along the radial direction of the valve body.

[0017] Optionally, a scratch or a groove is provided on a side of the triggering portion away from the connecting portion.

[0018] Optionally, the scratch or the groove is a C-shaped structure.

[0019] According to a second aspect of the present invention, there is provided a battery cover plate, including: a cover plate main body, an explosion-proof hole is provided on the cover plate main body, a connecting portion is provided on a first side of the cover plate main body, the connecting portion is located on an outer periphery of the explosion-proof hole, and the connecting portion is configured as a convex structure.

[0020] Optionally, the connecting portion is a resistance welding portion.

[0021] Optionally, the connecting portion is formed as an annular protrusion surrounding the explosion-proof hole.

[0022] Optionally, a first end of the connecting portion is connected to the cover plate main body, and a dimension of a cross-section of a second end of the connecting portion in a radial direction of the explosion-proof hole in a plane where the radial direction of the explosion-proof hole is located is smaller than a dimension of a cross-section of the first end of the connecting portion in the radial direction of the explosion-proof hole in the plane where the radial direction of the explosion-proof hole is located.

[0023] Optionally, the dimension of the cross-section of the connecting portion in the radial direction of the explosion-proof hole in the plane where the radial direction of the explosion-proof hole is located gradually decreases from the first end of the connecting portion to the second end of the connecting portion.

[0024] Optionally, a plurality of the connecting portions are provided on a first side of the cover plate main body, and the plurality of connecting portions are spaced apart along the radial direction of the explosion-proof hole.

[0025] Optionally, an explosion-proof valve installation groove is provided on the first side of the cover plate body, and the connecting portion is provided at the bottom of the explosion-proof valve installation groove.

[0026] According to a third aspect of the present invention, there is provided a cover plate assembly, including: a battery cover plate, the battery cover plate including a cover plate body provided with an explosion-proof hole; the explosion-proof valve according to any one of the above, the valve body being adapted to the explosion-proof hole, and the connecting portion being adapted to be connected to the cover plate body to connect the valve body to the cover plate body.

[0027] Optionally, an explosion-proof valve installation groove is provided on the first side of the cover plate body, and the explosion-proof hole is located inside the contour of the explosion-proof valve installation groove.

[0028] Optionally, a protruding portion is provided on the first side of the cover plate body, the explosion-proof hole penetrates through the protruding portion, and the protruding portion cooperates with the inner wall surface of the connecting portion to define the position of the explosion-proof valve body.

[0029] Optionally, a receiving groove is provided on the first side of the cover plate body, the receiving groove being formed as an annular groove extending along the circumference of the explosion-proof hole. When the connecting portion and the cover plate body are not welded, the projection of the connecting portion on the cover plate body does not coincide with the receiving groove. After the connecting portion and the cover plate body are welded, the receiving groove receives at least a part of the molten deformation of the connecting portion.

[0030] Optionally, when the connecting portion and the cover plate body are not welded, the projection of the connecting portion on the cover plate body is tangent to the contour of the receiving groove.

[0031] According to a fourth aspect of the present invention, there is provided a battery, including the explosion-proof valve according to any one of the above, or the cover plate assembly according to any one of the above.

[0032] According to a fifth aspect of the present invention, there is provided a battery pack, including the above battery.

[0033] According to a sixth aspect of the present invention, there is provided an electrical device, including the above battery or battery pack.

[0034] According to the explosion-proof valve and the battery cover plate of the present invention, by providing a connecting portion with a protruding structure, the explosion-proof valve and the battery cover plate can be connected together through the connecting portion, which can improve the stability of the connection quality between the explosion-proof valve and the battery cover plate and the reliability of the connection. At the same time, through the connection of the connecting portion, the explosion-proof valve and the battery cover plate do not need to be laser welded subsequently, so that no foreign matter will be generated during laser welding, which can ensure the reliability of the connection between the explosion-proof valve and the battery cover plate, improve the yield rate when the explosion-proof valve and the battery cover plate are connected, and the provided connecting portion is conducive to the explosion-proof valve and the battery cover plate being connected by other welding methods subsequently.

[0035] Other features and advantages of the present utility model will become clear through the following detailed description of the exemplary embodiments of the present utility model with reference to the accompanying drawings. Description of the Drawings

[0036] The drawings incorporated in and forming a part of the specification illustrate embodiments of the present utility model and, together with the description thereof, are used to explain the principles of the present utility model.

[0037] Figure 1 is a sectional view of the valve body of the explosion-proof valve of the cover plate assembly according to an embodiment provided by the present utility model;

[0038] Figure 2 is an exploded view of the structure of the cover plate assembly according to an embodiment provided by the present utility model;

[0039] Figure 3 is a sectional view of a part of the structure of the cover plate assembly according to an embodiment provided by the present utility model;

[0040] Figure 4 is Figure 3 an enlarged view of the structure at circle B in

[0041] Figure 5 is a sectional view of a part of the structure of the battery cover plate of the cover plate assembly according to an embodiment provided by the present utility model;

[0042] Figure 6 is Figure 5 an enlarged view of the structure at circle C in

[0043] Figure 7 is a sectional view of a part of the structure of the battery cover plate of the cover plate assembly according to another embodiment provided by the present utility model.

[0044] Reference Signs:

[0045] Cover plate assembly 100;

[0046] Connection part a;

[0047] Valve body 10; Scratch 11;

[0048] Cover plate main body 20; Explosion-proof hole 21; Explosion-proof valve installation groove 22;

[0049] Protrusion part 221; Accommodation groove 222;

[0050] Explosion-proof valve protection piece 30. Detailed Embodiments

[0051] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention.

[0052] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present invention or its application or use.

[0053] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification.

[0054] In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of exemplary embodiments may have different values.

[0055] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.

[0056] First, the explosion-proof valve according to an embodiment of the present invention will be specifically described below with reference to the accompanying drawings.

[0057] As Figure 1 shown, the explosion-proof valve according to an embodiment of the present invention includes: a valve body 10.

[0058] Specifically, the valve body 10 is provided with a triggering portion, and a connecting portion a is provided on one side of the valve body 10. The connecting portion is located on the outer periphery of the triggering portion, and the connecting portion a is configured as a convex structure.

[0059] In other words, as Figure 1As shown, the explosion-proof valve according to the embodiment of the utility model mainly includes a valve body 10, which is made of metal. The valve body 10 has an inner side and an outer side arranged relatively in the thickness direction. The valve body 10 has a trigger part, which corresponds to the position of the explosion-proof hole of the battery cover. Specifically, the central area of ​​the valve body 10 can be formed as a trigger part, and the structural strength of the trigger part is weaker than the structural strength of the peripheral area of ​​the valve body 10. For example, the trigger part has a thinning area so that the trigger part breaks when the internal pressure of the battery reaches the set pressure. The inner side of the valve body 10 is provided with a protruding structure located at the periphery of the trigger part, and the protruding structure can be used as a connecting part a, and the connecting part a is suitable for connecting with the battery cover. For example, the connecting part a is a resistance welding part, and the connecting part a enables the explosion-proof valve to be resistance welded with the battery cover. In addition, the connecting part a can also be connected to the battery cover by bonding or clamping, etc., which will not be described one by one in this embodiment. In this way, the explosion-proof valve can be connected to the battery cover without laser welding.

[0060] It should be noted that the valve body 10 may also be other structures in the prior art, and those skilled in the art may select one according to actual needs, which will not be described in detail in this embodiment.

[0061] Therefore, according to the explosion-proof valve of the embodiment of the utility model, by setting the connecting part a, the explosion-proof valve and the battery cover plate can be connected together through the connecting part a, which can improve the stability of the connection quality of the explosion-proof valve and the battery cover plate and the reliability of the connection. At the same time, through the connection part a, the explosion-proof valve and the battery cover plate do not need to be connected by laser welding later, so that foreign matter will not be generated in the laser welding connection, which can ensure the reliability of the connection between the explosion-proof valve and the battery cover plate, improve the yield of the connection between the explosion-proof valve and the battery cover plate, and the set connection part a is conducive to the subsequent connection of the explosion-proof valve and the battery cover plate by other welding methods.

[0062] In some specific embodiments of the present invention, the connecting portion a is formed as an annular protrusion surrounding the triggering portion.

[0063] Specifically, the inner side of the valve body 10 is provided with an annular protrusion extending along the circumference of the valve body, and the annular protrusion can be used as a connecting part a, so that an annular connecting structure can be formed on the outer periphery of the trigger part, which can ensure the sealing and reliability of the connection between the explosion-proof valve and the battery cover.

[0064] According to an embodiment of the present invention, the connecting portion a is a resistance welding portion.

[0065] That is to say, the connecting part a is configured as a resistance welding part suitable for resistance welding, so that the explosion-proof valve and the battery cover plate can be connected together by resistance welding, thereby ensuring the stability of the welded connection between the explosion-proof valve and the battery cover plate and good connection quality. Compared with the prior art, it has low sensitivity to process foreign matters, is easier to ensure welding tightness, and can improve the yield rate when the explosion-proof valve and the battery cover plate are welded; at the same time, the resistance welding equipment is relatively cheap and the welding efficiency is high, which is beneficial to reducing the production cost of the battery.

[0066] In some specific embodiments of the present invention, the valve body 10 is configured as a sheet body larger than the explosion-proof hole 21 of the battery cover plate, and the thickness range of the sheet body can be 0.45 mm to 2 mm. The valve body 10 with this structure is simple in structure and low in preparation cost.

[0067] In some alternative examples of the present invention, the valve body 10 and the connecting part a are integrally formed metal parts. For example, they can be directly cast, or the connecting part a can be obtained by milling the valve body 10, and its material can be 1 series pure aluminum, such as: 1060 series, 1070 series, etc.

[0068] Optionally, as Figure 4 shown, the dimension W of the cross-section of the connecting part a in the radial direction of the valve body 10 ranges from 0.05 mm to 2 mm, and the dimension H of the connecting part a in the thickness direction of the valve body 10 ranges from 0.05 mm to 2 mm. It should be noted that the dimension of the cross-section of the connecting part a in the radial direction of the valve body 10 and the dimension in the thickness direction of the valve body 10 can be determined according to its own material and actual requirements, which will not be elaborated in this embodiment.

[0069] Furthermore, as Figures 2 to 4 shown, an explosion-proof valve protection sheet 30 is adhesively bonded or hot-press welded to the side of the valve body 10 away from the connecting part a (that is, the outside of the valve body 10).

[0070] According to an embodiment of the present invention, the first end of the connecting part a is connected to the valve body 10, and the dimension of the cross-section of the second end of the connecting part a in the plane of the radial direction of the valve body 10 in the radial direction of the valve body 10 is smaller than the dimension of the cross-section of the first end of the connecting part a in the plane of the radial direction of the valve body 10 in the radial direction of the valve body 10.

[0071] Specifically, as Figure 1 and Figure 4As shown, in the thickness direction of the valve body 10, the connecting portion a has a first end and a second end that are oppositely arranged. The first end of the connecting portion a is fixed to the inner side of the valve body 10, and the dimension of the cross-section of the second end of the connecting portion a in the radial direction of the valve body 10 (i.e., the maximum dimension in the radial direction of the valve body 10) is smaller than the dimension of the cross-section of the first end of the connecting portion a in the radial direction of the plane where the radial direction of the valve body 10 is located (i.e., the maximum dimension in the radial direction of the valve body 10).

[0072] During welding, the second end of the connecting portion a contacts the cover body 20 of the battery cover. Since the dimension of the cross-section of the second end of the connecting portion a in the radial direction of the valve body 10 is smaller than the dimension of the cross-section of the first end of the connecting portion a in the radial direction of the valve body 10, the resistance of the second end of the connecting portion a is relatively large. Thus, it can be ensured that the second end of the connecting portion a melts first, and the welding quality can be guaranteed.

[0073] In some specific embodiments of the present utility model, the dimension of the cross-section of the connecting portion a in the plane where the radial direction of the valve body 10 is located gradually decreases from the first end to the second end of the connecting portion a in the radial direction of the valve body 10.

[0074] That is to say, the structure of the connecting portion a includes but is not limited to the following situations:

[0075] Situation 1: The cross-section of the connecting portion a in the plane where the radial direction of the valve body 10 is located is trapezoidal, for example, isosceles trapezoidal or right trapezoidal, etc.;

[0076] Situation 2: The cross-section of the connecting portion a in the plane where the radial direction of the valve body 10 is located is triangular, for example, isosceles triangular or right triangular, etc.

[0077] Thus, during resistance welding, it is beneficial for the connecting portion a to gradually melt from the second end to the first end of the connecting portion a, and the welding quality can be guaranteed.

[0078] According to an embodiment of the present utility model, a plurality of connecting portions a are provided on one side of the valve body 10, and the plurality of connecting portions a are spaced apart along the radial direction of the valve body 10.

[0079] In order to improve the connection strength and sealing performance between the valve body 10 and the cover body 20 of the battery cover, a plurality of connecting portions a, such as 2 to 3, are provided on the inner side of the valve body 10. The plurality of connecting portions a can be equally spaced apart along the radial direction of the valve body 10. For example, the distance between two adjacent connecting portions a can be in the range of 0.1 mm to 2.0 mm.

[0080] In this embodiment, by providing a plurality of connecting parts a, the welding area can be increased, thereby improving the connection strength between the valve body 10 and the cover plate body 20. Moreover, after welding, the plurality of connecting parts a can form a multi-channel sealing structure, effectively improving the sealing performance of the welding.

[0081] In some specific embodiments of the present utility model, a scratch 11 or a groove is provided on the side of the triggering part away from the connecting part a.

[0082] Specifically, the central region of the valve body can be formed as the triggering part. One or more scratches 11 or grooves are provided on the side of the central region of the valve body away from the connecting part a, so that the structural strength of the triggering part is less than that of the peripheral region of the valve body 10, facilitating the triggering part to break open when the internal pressure of the battery reaches the set pressure. Moreover, the structure is simple and convenient for production and manufacturing.

[0083] It should be noted that the depth and number of the scratches 11 or grooves can be adjusted according to the pressure required for the triggering part to break open. In addition, the triggering part can also be some other structures in the prior art, which will not be elaborated in this embodiment.

[0084] According to an embodiment of the present utility model, the scratch 11 or the groove is a C-shaped structure.

[0085] In this embodiment, setting the scratch 11 or the groove as a C-shaped structure is beneficial for the triggering part to break open from one side and will not break away from the valve body 10. Moreover, the structure is simple and convenient for production and processing.

[0086] In summary, for the explosion-proof valve according to the embodiment of the present utility model, by providing the connecting part a, the explosion-proof valve and the battery cover plate can be connected together through the connecting part a, improving the stability and reliability of the connection quality between the explosion-proof valve and the battery cover plate. At the same time, through the connection of the connecting part a, subsequent laser welding connection between the explosion-proof valve and the battery cover plate is not required, thus no foreign objects generated by laser welding connection will occur, ensuring the reliability of the connection between the explosion-proof valve and the battery cover plate, improving the yield rate when connecting the explosion-proof valve and the battery cover plate, and the provided connecting part a is beneficial for subsequent connection of the explosion-proof valve and the battery cover plate by other welding methods.

[0087] As Figure 7 shown, an embodiment of the present utility model further provides a battery cover plate, including: a cover plate body 20, the cover plate body 20 is provided with an explosion-proof hole 21, a connecting part a is provided on the first side of the cover plate body 20, the connecting part a is located on the outer periphery of the explosion-proof hole 21, and the connecting part a is configured as a convex structure.

[0088] In other words, the battery cover plate according to the embodiment of the present utility model mainly includes a cover plate main body 20, the cover plate main body 20 is an aluminum part, the cover plate main body 20 has a first side (for example, the side facing away from the inside of the battery, that is, the outer side) and a second side (for example, the side facing the inside of the battery, that is, the inner side) which are oppositely arranged in its thickness direction, the cover plate main body 20 is provided with an explosion-proof hole 21 penetrating along its thickness direction, one end of the explosion-proof hole 21 is suitable for installing an explosion-proof valve. Specifically, a convex structure is provided on the outer side of the cover plate main body 20, and the convex structure can be used as a connecting part a, and the connecting part a is suitable for connecting with the explosion-proof valve. For example, the connecting part a is a resistance welding part, and the connecting part a enables the battery cover plate to be resistance welded with the explosion-proof valve. In addition, the connecting part a can also be connected with the explosion-proof valve by means such as bonding or clamping, which will not be elaborated one by one in this embodiment. In this way, the battery cover plate can be connected with the explosion-proof valve without laser welding.

[0089] Therefore, for the cover plate main body 20 according to the embodiment of the present utility model, by providing the connecting part a, the explosion-proof valve and the battery cover plate can be connected together by the connecting part a, which can improve the stability of the connection quality between the explosion-proof valve and the battery cover plate and the reliability of the connection. At the same time, by connecting through the connecting part a, the explosion-proof valve and the battery cover plate do not need to be laser welded subsequently, so that no foreign matter will be generated during laser welding connection, which can ensure the reliability of the connection between the explosion-proof valve and the battery cover plate, improve the yield rate when the explosion-proof valve is connected with the battery cover plate, and the provided connecting part a is conducive to the explosion-proof valve and the battery cover plate to be connected by other welding methods subsequently.

[0090] According to an embodiment of the present utility model, the connecting part a is a resistance welding part.

[0091] That is to say, the connecting part a is configured as a resistance welding part suitable for resistance welding, so that the explosion-proof valve and the battery cover plate can be connected together by resistance welding, which can ensure the stability of the welding connection between the explosion-proof valve and the battery cover plate and good connection quality. Compared with the prior art, it is less sensitive to process foreign matters, is easier to ensure welding tightness, and can improve the yield rate when the explosion-proof valve is welded with the battery cover plate; at the same time, the resistance welding equipment is relatively cheap and the welding efficiency is high, which is conducive to reducing the production cost of the battery.

[0092] In some specific embodiments of the present utility model, the connecting part a is formed as an annular protrusion surrounding the explosion-proof hole.

[0093] Specifically, an annular protrusion extending along the circumferential direction of the explosion-proof hole 21 is provided on the outer side of the cover plate main body 20, and the annular protrusion can be used as the connecting part a, so that an annular connecting structure can be formed on the outer circumference of the explosion-proof hole 21, which can ensure the tightness and reliability of the connection between the explosion-proof valve and the battery cover plate.

[0094] In some alternative examples of the present utility model, the cover plate body 20 and the connecting portion a are integrally formed metal parts. For example, they can be directly cast, or the connecting portion a can be obtained by milling the cover plate body 20 with a milling cutter.

[0095] In some specific embodiments of the present utility model, the first end of the connecting portion a is connected to the cover plate body 20, and the dimension of the cross-section of the second end of the connecting portion a in the radial direction of the explosion-proof hole 21 in the plane where the radial direction of the explosion-proof hole 21 is located is smaller than the dimension of the cross-section of the first end of the connecting portion a in the radial direction of the explosion-proof hole 21 in the plane where the radial direction of the explosion-proof hole 21 is located.

[0096] Specifically, in the thickness direction of the cover plate body 20, the connecting portion a has a first end and a second end that are oppositely arranged. The first end of the connecting portion a is fixed to the outside of the cover plate body 20, and the dimension of the cross-section of the second end of the connecting portion a in the radial direction of the explosion-proof hole 21 in the plane where the radial direction of the explosion-proof hole 21 is located (i.e., the maximum dimension in the radial direction of the explosion-proof hole 21) is smaller than the dimension of the cross-section of the first end of the connecting portion a in the radial direction of the explosion-proof hole 21 in the plane where the radial direction of the explosion-proof hole 21 is located (i.e., the maximum dimension in the radial direction of the explosion-proof hole 21).

[0097] During welding, the second end of the connecting portion a contacts the valve body 10 of the explosion-proof valve. Since the dimension of the cross-section of the second end of the connecting portion a in the radial direction of the explosion-proof hole 21 in the plane where the radial direction of the explosion-proof hole 21 is located is smaller than the dimension of the cross-section of the first end of the connecting portion a in the radial direction of the explosion-proof hole 21 in the plane where the radial direction of the explosion-proof hole 21 is located, the resistance of the second end of the connecting portion a is relatively large. Thus, it can be ensured that the second end of the connecting portion a melts first, and the welding quality can be guaranteed.

[0098] According to an embodiment of the present utility model, the dimension of the cross-section of the connecting portion a in the radial direction of the explosion-proof hole 21 in the plane where the radial direction of the explosion-proof hole 21 is located gradually decreases from the first end of the connecting portion a to the second end of the connecting portion a.

[0099] That is to say, the structure of the connecting portion a includes but is not limited to the following situations:

[0100] Situation 1: The cross-section of the connecting portion a in the plane where the radial direction of the explosion-proof hole 21 is located is trapezoidal, for example, isosceles trapezoidal or right trapezoidal, etc.

[0101] Situation 2: The cross-section of the connecting portion a in the plane where the radial direction of the explosion-proof hole 21 is located is triangular, for example, isosceles triangular or right triangular, etc.

[0102] Thus, during resistance welding, it is beneficial for the connecting portion a to gradually melt from the second end of the connecting portion a to the first end of the connecting portion a, and the welding quality can be guaranteed.

[0103] In some specific embodiments of the present utility model, a plurality of connecting portions a are provided on the first side of the cover plate body 20, and the plurality of connecting portions a are spaced apart along the radial direction of the explosion-proof hole 21.

[0104] In order to improve the connection strength and sealing performance between the valve body 10 and the cover plate body 20 of the battery cover plate, a plurality of connecting portions a are provided on the outer side of the cover plate body 20, for example, 2 to 3. The plurality of connecting portions a can be equally spaced along the radial direction of the explosion-proof hole 21. For example, the distance between two adjacent connecting portions a can be in the range of 0.1 mm to 2.0 mm.

[0105] In this embodiment, the plurality of connecting portions a provided can increase the welding area, thereby improving the connection strength between the valve body 10 and the cover plate body 20. Moreover, after welding, the plurality of connecting portions a can form a plurality of sealing structures, which can effectively improve the sealing performance of the welding.

[0106] According to an embodiment of the present utility model, an explosion-proof valve installation groove 22 is provided on the first side of the cover plate body 20, and the connecting portion a is provided at the bottom of the explosion-proof valve installation groove 22.

[0107] In this embodiment, the explosion-proof valve installation groove 22 can limit the installation position of the explosion-proof valve, which is beneficial to the subsequent resistance welding process, improves the accuracy and efficiency of welding, and can effectively reduce the size of the cover plate assembly 100 in its thickness direction.

[0108] In summary, for the battery cover plate according to the embodiment of the present utility model, by providing the connecting portion a, the explosion-proof valve and the battery cover plate can be connected together through the connecting portion a, which can improve the stability of the connection quality between the explosion-proof valve and the battery cover plate and the reliability of the connection. At the same time, by connecting through the connecting portion a, the explosion-proof valve and the battery cover plate do not need to be connected by laser welding subsequently, so that no foreign matter generated by laser welding connection will be generated, which can ensure the reliability of the connection between the explosion-proof valve and the battery cover plate, improve the yield rate when the explosion-proof valve and the battery cover plate are connected, and the provided connecting portion a is beneficial to the explosion-proof valve and the battery cover plate to be connected by other welding methods subsequently.

[0109] As Figures 2 to 6 shown, an embodiment of the present utility model further provides a cover plate assembly 100, including: a battery cover plate and an explosion-proof valve. The battery cover plate includes a cover plate body 20. The cover plate body 20 is provided with an explosion-proof hole 21. The explosion-proof valve is the explosion-proof valve described in any of the above embodiments. The valve body 10 is adapted to the explosion-proof hole 21, and the connecting portion a is adapted to be connected to the cover plate body 20 to connect the valve body 10 and the cover plate body 20.

[0110] In other words, as Figures 2 to 6As shown, the cover plate assembly 100 according to an embodiment of the present utility model mainly includes a battery cover plate and the explosion-proof valve described in any of the above embodiments. Among them, the battery cover plate includes a cover plate main body 20, and the cover plate main body 20 is provided with an explosion-proof hole 21 penetrating along its thickness direction. The explosion-proof valve main body 10 is adapted to the explosion-proof hole 21, so that the explosion-proof valve can seal the explosion-proof hole 21 at one end of the explosion-proof hole 21, and the valve main body 10 and the cover plate main body 20 can be connected together by the connecting portion a without using laser welding (for example, resistance welding can be used).

[0111] Since the explosion-proof valve according to the embodiment of the present utility model has the above technical effects, the cover plate assembly 100 according to the embodiment of the present utility model also has corresponding technical effects, which will not be elaborated in this embodiment.

[0112] As Figure 6 shown, in some specific embodiments of the present utility model, an explosion-proof valve installation groove 22 is provided on the first side of the cover plate main body 20, and the explosion-proof hole 21 is located inside the contour of the explosion-proof valve installation groove 22.

[0113] In this embodiment, the explosion-proof valve installation groove 22 can limit the installation position of the explosion-proof valve, which is beneficial to the subsequent resistance welding process, improves the welding accuracy and efficiency, and can effectively reduce the size of the cover plate assembly 100 in its thickness direction.

[0114] In some alternative examples of the present utility model, a protruding portion 221 is provided on the first side of the cover plate main body 20, the explosion-proof hole 21 penetrates through the protruding portion 221, and the protruding portion 221 cooperates with the inner wall surface of the connecting portion a to limit the position of the explosion-proof valve main body 10.

[0115] That is to say, as Figure 4 and Figure 6 shown, a protruding portion 221 is provided at the bottom of the explosion-proof valve installation groove 22, the explosion-proof hole 21 penetrates through the protruding portion 221 in the width direction of the cover plate main body 20, the protruding portion 221 corresponds to the space inside the connecting portion a, and the position of the explosion-proof valve main body 10 can be limited by the cooperation of the outer peripheral surface of the protruding portion 221 and the inner wall surface of the connecting portion a, which is beneficial to the subsequent resistance welding process and improves the welding accuracy and efficiency.

[0116] According to an embodiment of the present utility model, a receiving groove 222 is provided on the first side of the cover plate main body 20. The receiving groove 222 is formed as an annular groove extending along the circumference of the explosion-proof hole 21. When the connecting portion a and the cover plate main body 20 are not welded, the projection of the connecting portion a on the cover plate main body 20 does not coincide with the receiving groove 222. After the connecting portion a and the cover plate main body 20 are welded, the receiving groove 222 receives at least a part of the molten deformation of the connecting portion a.

[0117] Specifically, as Figure 6As shown, an annular groove extending circumferentially along the explosion-proof hole 21 is provided on the outer side of the cover plate body 20. The annular groove is located at the bottom of the receiving groove 222, and this annular groove can serve as a receiving groove 222 suitable for receiving at least a part of the molten deformation of the connecting portion a.

[0118] Specifically, as Figure 4 shown, when the connecting portion a is not welded to the cover plate body 20, in the radial direction of the explosion-proof hole 21, the second end of the connecting portion a is offset from the receiving groove 222, and the second end of the connecting portion a can contact the cover plate body 20 in the area inside or outside the contour of the annular groove. That is, in the radial direction of the explosion-proof hole 21, the annular groove is located inside or outside the connecting portion a, and there is a gap between the valve body 11 and the top surface of the convex portion 221.

[0119] When the connecting portion a is resistance welded to the cover plate body 20, the second end of the connecting portion a is melted, and the melted material can flow into the receiving groove 222, thereby ensuring a beautiful weld formation and achieving a good welding effect. Moreover, the provided convex portion 221 is beneficial for the melted material to flow into the receiving groove 222; after the connecting portion a is welded to the cover plate body 20, the valve body 11 fits against the top surface of the convex portion 221.

[0120] Optionally, the width range of the receiving groove 222 is 0.1 mm to 2.0 mm.

[0121] In some specific embodiments of the present invention, when the connecting portion a is not welded to the cover plate body 20, the projection of the connecting portion a on the cover plate body 20 is tangent to the contour of the receiving groove 222. Thus, when the connecting portion a and the cover plate body 20 are connected by resistance welding, the receiving groove 222 can immediately collect and accommodate the melted material of the connecting portion a, which can further ensure a beautiful weld formation.

[0122] In some alternative examples of the present invention, the number and position of the receiving grooves 222 correspond to the number and position of the connecting portions a on the valve body 10, so as to accommodate the melted portions of each connecting portion a.

[0123] According to an embodiment of the present invention, the battery cover plate is the battery cover plate described in any of the above embodiments.

[0124] That is to say, both the valve body 10 and the cover plate body 20 are provided with connecting portions a, and the connecting portions a on the valve body 10 and the connecting portions a on the cover plate body 20 can be offset from each other, thereby further increasing the welding area, and thus improving the connection strength between the valve body 10 and the cover plate body 20 and the welding tightness.

[0125] An embodiment of the present utility model further provides a battery, including the explosion-proof valve described in any of the above embodiments, or the cover plate assembly 100 described in any of the above embodiments. Since the explosion-proof valve and the battery cover plate according to the embodiments of the present utility model have the above technical effects, the battery according to the embodiments of the present utility model also has corresponding technical effects, which will not be elaborated in this embodiment.

[0126] An embodiment of the present utility model further provides a battery pack, including the battery described in the above embodiment. Since the explosion-proof valve and the battery cover plate according to the embodiments of the present utility model have the above technical effects, the battery pack according to the embodiments of the present utility model also has corresponding technical effects, which will not be elaborated in this embodiment.

[0127] An embodiment of the present utility model further provides an electrical equipment, which is, for example, but not limited to, a vehicle, and the vehicle includes the battery or the battery pack described in the above embodiment. Since the explosion-proof valve and the battery cover plate according to the embodiments of the present utility model have the above technical effects, the electrical equipment according to the embodiments of the present utility model also has corresponding technical effects, which will not be elaborated in this embodiment.

[0128] Although some specific embodiments of the present utility model have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present utility model. The scope of the present utility model is defined by the appended claims.

Claims

1. An explosion-proof valve, characterized in that: include: The valve body is provided with a trigger part, and a connecting part is provided on one side of the valve body. The connecting part is located at the periphery of the trigger part, and the connecting part is configured as a convex structure.

2. The explosion-proof valve according to claim 1, characterized in that: The connecting portion is formed as an annular protrusion surrounding the triggering portion.

3. The explosion-proof valve according to claim 1, characterized in that: The connecting portion is a resistance welding portion.

4. The explosion-proof valve according to claim 1, characterized in that: The valve body is configured as a sheet body.

5. The explosion-proof valve according to claim 1, characterized in that: The first end of the connecting portion is connected to the valve body, and the dimension of the cross-section of the second end of the connecting portion in the plane where the radial direction of the valve body is located in the radial direction of the valve body is smaller than the dimension of the cross-section of the first end of the connecting portion in the plane where the radial direction of the valve body is located in the radial direction of the valve body.

6. The explosion-proof valve according to claim 5, characterized in that: The dimension of the cross section of the connecting portion in the plane where the radial direction of the valve body is located in the radial direction of the valve body gradually decreases from the first end of the connecting portion to the second end of the connecting portion.

7. The explosion-proof valve according to claim 1, characterized in that: A plurality of the connecting portions are provided on one side of the valve body, and the plurality of the connecting portions are spaced apart in a radial direction of the valve body.

8. The explosion-proof valve according to claim 1, characterized in that: A scratch or a groove is provided on a side of the trigger portion away from the connecting portion.

9. The explosion-proof valve according to claim 8, characterized in that: The scratches or the grooves are C-shaped structures.

10. A battery cover, characterized in that: include: A cover plate body is provided with an explosion-proof hole, a first side of the cover plate body is provided with a connecting portion, the connecting portion is located at the periphery of the explosion-proof hole, and the connecting portion is configured as a convex structure.

11. The battery cover according to claim 10, characterized in that: The connecting portion is a resistance welding portion.

12. The battery cover according to claim 10, characterized in that: The connecting portion is formed as an annular protrusion surrounding the explosion-proof hole.

13. The battery cover according to claim 10, characterized in that: The first end of the connecting portion is connected to the cover plate body, and the dimension of the cross section of the second end of the connecting portion in the plane in the radial direction of the explosion-proof hole in the radial direction of the explosion-proof hole is smaller than the dimension of the cross section of the first end of the connecting portion in the plane in the radial direction of the explosion-proof hole in the radial direction of the explosion-proof hole.

14. The battery cover according to claim 13, characterized in that: The dimension of the cross section of the connecting portion in the plane in the radial direction of the explosion-proof hole in the radial direction of the explosion-proof hole gradually decreases from the first end of the connecting portion to the second end of the connecting portion.

15. The battery cover according to claim 10, characterized in that: A plurality of the connecting portions are disposed on the first side of the cover plate body, and the plurality of the connecting portions are spaced apart along the radial direction of the explosion-proof hole.

16. The battery cover according to claim 10, characterized in that: An explosion-proof valve installation groove is provided on the first side of the cover plate body, and the connecting portion is provided at the bottom of the explosion-proof valve installation groove.

17. A cover plate assembly, characterized in that: include: A battery cover, the battery cover comprising a cover body, the cover body being provided with an explosion-proof hole ； The explosion-proof valve according to any one of claims 1 to 9, wherein the valve body is adapted to fit the explosion-proof hole, and the connecting portion is adapted to be connected to the cover plate body so as to connect the valve body and the cover plate body.

18. The cover plate assembly according to claim 17, characterized in that: An explosion-proof valve installation groove is provided on the first side of the cover plate body, and the explosion-proof hole is located inside the contour of the explosion-proof valve installation groove.

19. The cover plate assembly according to claim 17, characterized in that: A convex portion is provided on the first side of the cover plate body, the explosion-proof hole passes through the convex portion, and the convex portion cooperates with the inner wall surface of the connecting portion to define the position of the explosion-proof valve body.

20. The cover plate assembly according to claim 17, characterized in that A receiving groove is provided on the first side of the cover plate body, and the receiving groove is formed as an annular groove extending along the circumference of the explosion-proof hole. When the connection portion is not connected to the cover plate body by welding, the projection of the connection portion on the cover plate body does not overlap with the receiving groove. After the connection portion is connected to the cover plate body by welding, the receiving groove receives at least a portion of the connection portion that is melted and deformed.

21. The cover plate assembly according to claim 20, characterized in that: When the connection portion is not connected to the cover plate body by welding, the projection of the connection portion on the cover plate body is tangent to the contour of the accommodating groove.

22. The cover plate assembly according to claim 20, characterized in that: The battery cover is the battery cover according to any one of claims 10 to 16.

23. A battery, characterized in that: The invention comprises the explosion-proof valve according to any one of claims 1 to 9, or the cover plate assembly according to any one of claims 17 to 22.

24. A battery pack, characterized in that: Comprising the battery of claim 23.

25. An electrical device, characterized in that: Comprising the battery as claimed in claim 23, or the battery pack as claimed in claim 24.

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