Explosion-proof valve, battery pack and electric device

Abstract

The utility model discloses an explosion-proof valve, a battery pack and an electric device, and the explosion-proof valve comprises a valve body (1) which is provided with an exhaust duct (14); the valve plate (2) is arranged on the exhaust hole channel (14) and seals the exhaust hole channel (14), the valve plate (2) comprises a first connecting part (22) which is used for being connected with the valve body (1) so as to keep the valve plate (2) in a state of sealing the exhaust hole channel (14), and the first connecting part (22) is detachably or destructively connected with the valve body (1); the explosion-proof valve has the advantages that the structure is simple, the number of parts is small, and the assembly is simple.

Description

Technical Field

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

[0002] New energy batteries are increasingly widely used in life and industries. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the energy storage field and so on. In new energy vehicles equipped with batteries, the batteries can be used to provide power wholly or partly. In the energy storage field, the batteries can be installed in an energy storage box body or directly installed on the user side.

[0003] An explosion-proof valve is installed on the casing of the battery to prevent the explosion risk caused by abnormal conditions such as overheating and overcharging of the battery, and to ensure the safe operation of the battery. When the battery is working normally, the explosion-proof valve seals the casing to ensure the normal operation of the battery; when the battery undergoes thermal runaway, the explosion-proof valve needs to promptly turn on the explosion-proof function and discharge the internal gas and heat in time, thereby reducing the explosion risk. The existing explosion-proof valves have complex structures and high costs. Summary of the Utility Model

[0004] The utility model aims to provide an explosion-proof valve, a battery pack and an electrical device to improve the problems of complex structure and high cost of the explosion-proof valve in the prior art.

[0005] According to one aspect of the embodiments of the utility model, the utility model provides an explosion-proof valve, which includes: a valve body provided with an exhaust passage; and a valve flap arranged on the exhaust passage and closing the exhaust passage. The valve flap includes a first connecting portion for connecting with the valve body to keep the valve flap in a state of closing the exhaust passage. The first connecting portion is detachably or destructibly connected with the valve body, so that the valve flap opens the exhaust passage under the action of the exhaust pressure.

[0006] In some embodiments, the first connecting portion includes a buckle, and the valve body is provided with a clamping structure matching with the buckle.

[0007] In some embodiments, the valve flap further includes a second connecting portion, and the valve body is further provided with a third connecting portion hinged with the second connecting portion.

[0008] In some embodiments, the first connecting portion and the second connecting portion are respectively arranged on opposite sides of the exhaust passage.

[0009] In some embodiments, the second connecting portion includes a first pin hole, the third connecting portion includes a second pin hole coaxial with the first pin hole, and a hinge shaft is arranged in the first pin hole and the second pin hole.

[0010] In some embodiments, the second connecting portion is arranged on the end face of the valve body at the end along the flow direction of the exhaust passage.

[0011] In some embodiments, the valve plate is disposed on the end face of the valve body at the end along the flow direction of the exhaust passage.

[0012] In some embodiments, the air inlet and the air outlet of the exhaust passage are respectively disposed at opposite ends of the valve body.

[0013] In some embodiments, the valve body is flat, and the exhaust passage extends along the thickness direction of the valve body.

[0014] In some embodiments, the explosion-proof valve further includes a sealing ring sleeved outside the exhaust passage, and the sealing ring abuts against the valve plate to seal the exhaust passage.

[0015] In some embodiments, the first connecting portion includes a weak connecting portion that is easily broken.

[0016] According to another aspect of the present invention, there is also provided a battery pack, which includes the above-mentioned explosion-proof valve.

[0017] According to another aspect of the present invention, there is also provided an electrical device, which includes the above-mentioned battery pack.

[0018] Applying the technical solution of the present invention, the valve plate is held in a state of closing the exhaust passage by the first connecting portion that is detachably or destructibly connected to the valve body. The exhaust pressure of the gas generated by the thermal runaway of the battery pack can open the valve plate. Compared with the prior art in which elastic components and other parts are used to hold the piston in a state of closing the exhaust passage, the explosion-proof valve of this embodiment has a simple structure, fewer parts, and simple assembly.

[0019] Through the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings, other features and advantages of the present invention will become clear. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention 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, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 The structural schematic diagram of an electrical device disclosed in some embodiments of the present invention is shown.

[0022] Figure 2 The exploded structural schematic diagram of a battery pack disclosed in some embodiments of the present invention is shown.

[0023] Figure 3The figure shows a schematic structural diagram of a battery cell disclosed in some embodiments of the present utility model.

[0024] Figure 4 The figure shows a schematic structural diagram of a battery pack disclosed in some embodiments of the present utility model.

[0025] Figure 5 The figure shows a three-dimensional structural diagram of an explosion-proof valve disclosed in some embodiments of the present utility model.

[0026] Figure 6 The figure shows a top-view structural diagram of an explosion-proof valve disclosed in some embodiments of the present utility model.

[0027] Figure 7 The figure shows Figure 6 a schematic cross-sectional structural diagram at A-A in

[0028] Figure 8 The figure shows a front-view structural diagram of an explosion-proof valve disclosed in some embodiments of the present utility model.

[0029] Figure 9 The figure shows a three-dimensional structural diagram of an explosion-proof valve in an open state disclosed in some embodiments of the present utility model.

[0030] Figure 10 The figure shows a top-view structural diagram of an explosion-proof valve in an open state disclosed in some embodiments of the present utility model.

[0031] Figure 11 The figure shows Figure 10 a schematic cross-sectional structural diagram at B-B in

[0032] Figure 12 The figure shows Figure 11 a partial enlarged view at C in

[0033] In the figure: 1000, vehicle; 100, battery pack; 110, box body; 111, first part; 112, second part; 120, battery cell; 121, end cover; 121a, electrode terminal; 122, housing; 123, battery core assembly; 123a, tab; 200, controller; 300, motor; 10, explosion-proof valve; 1, valve body; 11, third connection part; 12, mounting structure; 13, clamping structure; 14, exhaust passage; 2, valve plate; 21, second connection part; 22, first connection part; 3, hinge shaft; 4, sealing ring. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0036] The orientation terms appearing in the following description are all the directions shown in the drawings and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] If there is no special description, all the embodiments and optional embodiments of the present invention can be combined with each other to form a new technical solution.

[0038] If there is no special description, all the technical features and optional technical features of the present invention can be combined with each other to form a new technical solution.

[0039] If there is no special description, the "including" and "comprising" mentioned in the present invention mean open-ended or closed-ended. For example, the "including" and "comprising" can mean that other components not listed can also be included or comprised, or only the components listed are included or comprised.

[0040] Unless otherwise specified, in the present utility model, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) while B is true (or exists); or both A and B are true (or exist).

[0041] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation tools such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand for them is also constantly increasing.

[0042] Figure 1 The structural schematic diagram of an electrical device using a battery as a power source is shown; as Figure 1 shown, the electrical device of this embodiment includes a vehicle 1000, and the vehicle 1000 can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery pack 100 is arranged inside the vehicle 1000, and the battery pack 100 can be arranged at the bottom, head, or tail of the vehicle 1000. The battery pack 100 can be used for power supply of the vehicle 1000. For example, the battery pack 100 can be used as the operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, and the controller 200 is used to control the battery pack 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0043] In some embodiments of the present utility model, the battery pack 100 can not only be used as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0044] Please refer to Figure 2 , Figure 2Explosion diagram of the battery pack 100 provided by some embodiments of the present utility model. The battery pack 100 includes a box body 110 and a battery module disposed within the box body 110. The battery module includes a plurality of battery cells 120, and the battery cells 120 are accommodated within the box body 110. Among them, the box body 110 is used to provide an accommodation space for the battery cells 120, and the box body 110 can adopt various structures. In some embodiments, the box body 110 may include a first part 111 and a second part 112. The first part 111 and the second part 112 cover each other, and the first part 111 and the second part 112 jointly define an accommodation space for accommodating the battery cells 120. The second part 112 may be a hollow structure with one end open, and the first part 111 may be a plate-like structure. The first part 111 covers the open side of the second part 112 so that the first part 111 and the second part 112 jointly define the accommodation space; the first part 111 and the second part 112 may also both be hollow structures with one side open, and the open side of the first part 111 covers the open side of the second part 112. Of course, the box body 110 formed by the first part 111 and the second part 112 can be of various shapes, such as a cylinder, a cuboid, etc.

[0045] In the battery pack 100, there may be a plurality of battery cells 120. The plurality of battery cells 120 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the plurality of battery cells 120. The plurality of battery cells 120 can be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the plurality of battery cells 120 is accommodated within the box body 110; of course, the battery pack 100 can also be such that a plurality of battery cells 120 are first connected in series, in parallel, or in a series-parallel combination to form a battery module form, and then a plurality of battery modules are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated within the box body 110. The battery pack 100 may further include other structures. For example, the battery pack 100 may further include a busbar component for realizing electrical connection among the plurality of battery cells 120.

[0046] Among them, each battery cell 120 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 120 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0047] Please refer to Figure 3 , Figure 3 which is a schematic exploded view of the battery cell 120 provided by some embodiments of the present utility model. The battery cell 120 refers to the smallest unit that composes the battery pack 100. As Figure 3 shown, the battery cell 120 includes an end cap 121, a housing 122, a core component 123, and other functional components.

[0048] The end cap 121 refers to a component that covers the opening of the housing 122 to isolate the internal environment of the battery cell 120 from the external environment. Without limitation, the shape of the end cap 121 can be adapted to the shape of the housing 122 to fit the housing 122. Optionally, the end cap 121 can be made of a material with a certain hardness and strength, such as aluminum alloy. In this way, the end cap 121 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 120 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 121a can be provided on the end cap 121. The electrode terminals 121a can be used for electrical connection with the battery cell assembly 123 to output or input the electrical energy of the battery cell 120. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 120 reaches a threshold can also be provided on the end cap 121. The material of the end cap 121 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present invention do not make special restrictions on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap 121. The insulating member can be used to isolate the electrical connection components in the housing 122 from the end cap 121 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0049] The housing 122 is a component for cooperating with the end cap 121 to form the internal environment of the battery cell 120. Among them, the formed internal environment can be used to accommodate the battery cell assembly 123, electrolyte, and other components. The housing 122 and the end cap 121 can be independent components. An opening can be provided on the housing 122, and the end cap 121 is covered at the opening to form the internal environment of the battery cell 120. Without limitation, the end cap 121 and the housing 122 can also be integrated. Specifically, the end cap 121 and the housing 122 can first form a common connection surface before other components are put into the housing. When it is necessary to encapsulate the inside of the housing 122, the end cap 121 is then covered on the housing 122. The housing 122 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 122 can be determined according to the specific shape and size of the battery cell assembly 123. The material of the housing 122 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present invention do not make special restrictions on this.

[0050] The battery cell assembly 123 is a component in the battery cell 120 where an electrochemical reaction occurs. The housing 122 can contain one or more battery cell assemblies 123. The battery cell assembly 123 is mainly formed by winding or stacking electrode sheets. Among them, the electrode sheets include positive electrode sheets and negative electrode sheets, and an isolation film is usually provided between the positive electrode sheet and the negative electrode sheet.

[0051] The electrode plate mainly consists of a flaky current collector and active materials coated on the current collector. The parts of the positive electrode plate (cathode electrode plate) and the negative electrode plate (anode electrode plate) with active materials constitute the main body of the battery cell assembly, and the parts of the positive electrode plate and the negative electrode plate without active materials respectively constitute the electrode tabs 123a. The positive electrode tab and the negative electrode tab can be located at one end of the main body together or at both ends of the main body respectively. During the charging and discharging process of the battery pack 100, the positive active material and the negative active material react with the electrolyte, and the electrode tabs 123a are connected to the electrode terminals to form a current loop.

[0052] To ensure the safe and stable operation of the battery pack, it is necessary to achieve waterproof and dustproof, that is, the battery pack theoretically needs to be in a sealed state. However, in the sealed state, once the battery cells in the battery pack 100 are short-circuited and a thermal runaway event occurs, a large amount of gas will be generated, causing the gas pressure inside the box 110 of the battery pack 100 to rise rapidly. If the gas cannot be exhausted and the pressure cannot be relieved in time, it may lead to violent fires and explosions, causing heavy casualties and property losses. See Figure 4 At present, the existing technical solution is to install an explosion-proof valve 10 that can be opened under the pressure of the gas generated by the battery pack 100 on the box 110 of the battery pack 100 to meet the requirements of waterproof, explosion-proof, exhaust and pressure relief of the power battery system.

[0053] Generally, the explosion-proof valve includes a valve body provided with an exhaust passage, a piston covering the outlet end of the exhaust passage, and an elastic member for elastically pressing the piston toward the outlet end of the exhaust passage. The piston can move relative to the valve body to open the piston under the pressure of the gas generated during the thermal runaway of the battery pack, thereby realizing the exhaust and pressure relief of the battery pack. The explosion-proof valve further includes a guiding member for guiding the movement of the piston relative to the valve body.

[0054] The above explosion-proof valve has a complex structure, many types of components and cumbersome assembly steps. Further, relying on the spring elastic member to compress the sealing ring may cause problems of sealing failure. Even insulation failure or short-circuit faults may be caused, posing a great threat to the personal and property safety of the occupants.

[0055] In order to improve the above problems, a new type of explosion-proof valve is provided in this embodiment. See Figures 5 to 10 The explosion-proof valve includes a valve body 1 and a valve plate 2. The valve body 1 is provided with an exhaust passage 14. The valve plate 2 is arranged on the exhaust passage 14 and closes the exhaust passage 14. The valve plate 2 includes a first connecting portion 22 for connecting to the valve body 1 to keep the valve plate 2 in a state of closing the exhaust passage 14. The first connecting portion 22 is detachably or destructibly connected to the valve body 1, so that the valve plate 2 opens the exhaust passage 14 under the action of the exhaust pressure.

[0056] In this embodiment, the first connecting portion 22 detachably or destructibly connected to the valve body 1 holds the valve plate 2 in a state of closing the exhaust passage 14. The exhaust pressure of the gas generated by the thermal runaway of the battery pack can open the valve plate 2. Compared with the related art that uses components such as elastic members to hold the piston in closing the exhaust passage, the explosion-proof valve of this embodiment has a simple structure, fewer components, and simple assembly.

[0057] In some embodiments, referring to Figures 10 to 12 , the first connecting portion 22 includes a buckle, and the valve body 1 is provided with a clamping structure 13 that cooperates with the buckle. The valve plate 2 is connected to the valve body 1 through the buckle. When a large amount of gas is generated in the battery pack 100 due to thermal runaway, the pressure of the gas pushes the buckle of the valve plate 2 to disengage from the clamping structure 13, and the valve plate 2 opens the exhaust passage 14 to discharge the gas of the battery pack 100, thereby achieving the performance of preventing the battery pack 100 from exploding.

[0058] In some embodiments, the valve plate 2 further includes a second connecting portion 21, and the valve body is further provided with a third connecting portion 11 hinged to the second connecting portion. After the valve plate 2 opens the exhaust passage 14 under the action of the gas pressure, the second connecting portion of the valve plate 2 remains hinged to the valve body 1, and the gas is discharged to the side away from the second connecting portion 21. The valve plate 2 has a constraining effect on the exhaust direction and can guide the discharged gas to a predetermined direction, thereby preventing damage to the components outside the battery pack 100 caused by the exhaust.

[0059] In some embodiments, the first connecting portion 22 and the second connecting portion 21 are respectively arranged on opposite sides of the exhaust passage 14. The distance between the first connecting portion 22 and the second connecting portion 21 is relatively far, and the buckle is easy to open under the action of the gas pressure.

[0060] In some embodiments, the second connecting portion 21 includes a first pin hole, the third connecting portion 11 includes a second pin hole coaxial with the first pin hole, and a hinge shaft 3 is inserted through the first pin hole and the second pin hole. Referring to Figure 9 , after the buckle disengages from the clamping structure 13 under the action of the gas pressure, the valve plate 2 rotates around the hinge shaft 3 to open the exhaust passage.

[0061] In some embodiments, the second connecting portion 21 is arranged on the end face of the valve body 1 at the end along the flow direction of the exhaust passage 14. Compared with arranging the second connecting portion 21 in the exhaust passage 14, arranging the second connecting portion 21 on the end face has a simpler structure, is easier to implement, and is beneficial to reducing costs.

[0062] In some embodiments, the valve plate 2 covers the end face of the valve body 1 at the end along the flow direction of the exhaust passage 14. Compared with arranging the valve plate 2 in the exhaust passage 14, after the buckle on the valve plate 2 disengages from the clamping structure 13, the valve plate 2 can open more smoothly towards the outside to play a role in exhausting and relieving pressure.

[0063] In some embodiments, the air inlet and the air outlet of the exhaust passage 14 are respectively arranged at opposite ends of the valve body 1. The valve body 1 is generally cylindrical or disc-shaped as a whole, the exhaust passage 14 is a simple straight line, one side of the valve plate 2 is hinged to the outer end of the valve body 1, and the other end is clamped to the valve body 1. The explosion-proof valve of this embodiment has a simple structure, few components and few assembly steps.

[0064] In some embodiments, the valve body 1 is flat, and the exhaust passage 14 extends along the thickness direction of the valve body 1. The explosion-proof valve has a small and compact structure, and can be attached to the outer surface of the battery pack box body, with a small outward protrusion and a compact structure.

[0065] In some embodiments, the explosion-proof valve further includes a sealing ring 4 sleeved outside the exhaust passage 14. The sealing ring 4 abuts against the valve plate 2 to seal the exhaust passage, which is beneficial to improving the waterproof and dustproof performance of the battery pack and enhancing the safety of the battery.

[0066] In some other embodiments, the first connecting portion 22 includes a weak connecting portion that is easily broken. In some embodiments, the weak connecting portion includes a plurality of intermittent slits. The pressure of the gas generated due to thermal runaway in the battery pack can break the weak connecting portion, thereby opening the valve plate 2.

[0067] In some other embodiments, the strength or thickness of the weak connecting portion is lower than that of the valve plate material. Further, the weak connecting portion extends along the circumferential direction of the valve plate 2 and seals the gap between the valve plate 2 and the valve body 1 to achieve the sealing of the battery pack, and a better sealing effect can be achieved compared with the arrangement of the sealing ring.

[0068] See Figures 10 to 12 , a second pin hole is provided on the valve body 1 of the explosion-proof valve of this embodiment, a clamping structure (clamping flat position) is provided in the exhaust passage 14, and an installation structure 12 for connecting the battery pack box body is further provided on the valve body 1. The installation structure 12 includes a locking hole. The explosion-proof valve is installed on the battery pack box body or the box cover through a bolt adapted to the locking hole. When thermal runaway occurs, the clamping position between the valve plate 2 and the valve body 1 of the explosion-proof valve is disengaged, and the valve plate 2 is opened to achieve the purpose of rapid pressure relief.

[0069] The above are only exemplary embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An explosion-proof valve, characterized in that: include: The valve body (1) is provided with an exhaust hole (14); and A valve plate (2) is disposed on the exhaust passage (14) and closes the exhaust passage (14), the valve plate (2) comprising a first connection portion (22) for connecting to the valve body (1) so as to keep the valve plate (2) in a state of closing the exhaust passage (14), the first connection portion (22) being detachably or destructibly connected to the valve body (1) so as to enable the valve plate (2) to open the exhaust passage (14) under the action of exhaust pressure. The air inlet and the air outlet of the exhaust channel (14) are respectively arranged at two opposite ends of the valve body (1).

2. The explosion-proof valve according to claim 1, characterized in that: The first connecting portion (22) comprises a buckle, and the valve body (1) is provided with a clamping structure (13) that matches the buckle.

3. The explosion-proof valve according to claim 1 or 2, characterized in that: The valve plate (2) further comprises a second connecting portion (21), and the valve body is further provided with a third connecting portion (11) hingedly connected to the second connecting portion (21).

4. The explosion-proof valve according to claim 3, characterized in that: The first connection portion (22) and the second connection portion (21) are respectively arranged on two opposite sides of the exhaust duct (14).

5. The explosion-proof valve according to claim 3, characterized in that: The second connecting portion (21) comprises a first pin shaft hole, the third connecting portion (11) comprises a second pin shaft hole coaxial with the first pin shaft hole, and a hinge shaft (3) is passed through the first pin shaft hole and the second pin shaft hole.

6. The explosion-proof valve according to claim 3, characterized in that: The second connecting portion (21) is provided on an end surface of the valve body (1) at the end along the flow direction of the exhaust channel (14).

7. The explosion-proof valve according to claim 1, characterized in that: The valve plate (2) is covered on an end surface of the valve body (1) at the end along the flow direction of the exhaust channel (14).

8. The explosion-proof valve according to claim 1, characterized in that: The valve body (1) is flat, and the exhaust channel (14) extends along the thickness direction of the valve body (1).

9. The explosion-proof valve according to claim 1, characterized in that: It also comprises a sealing ring (4) sleeved outside the exhaust hole (14), wherein the sealing ring (4) abuts against the valve plate (2) to seal the exhaust hole.

10. The explosion-proof valve according to claim 1, characterized in that: The first connecting portion (22) comprises a weak connecting portion that is easily broken.

11. A battery pack, characterized in that: The explosion-proof valve comprises the explosion-proof valve according to any one of claims 1 to 10.

12. An electrical device, characterized in that: A battery pack comprising the battery pack of claim 11.

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