Explosion-proof valve, battery pack and electric device

Abstract

The utility model discloses an anti-explosion valve, a battery pack and an electric device, and the anti-explosion valve comprises a valve body (5) which is provided with an exhaust duct (51); the piston (7) is movably mounted on the valve body (5) so as to be switched between a first position for closing the exhaust duct (51) and a second position for opening the exhaust duct (51), and the piston (7) is configured to be switched to the second position under the action of exhaust pressure of the exhaust duct (51); and the breathable dustproof membrane (1) is mounted on the exhaust hole channel (51) of the valve body (5), and the dustproof membrane (1) is located on the upstream of the piston (7) in the exhaust direction of the exhaust hole channel (51).

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, specifically, relate to a kind of explosion-proof valve, battery pack and electric device BACKGROUND

[0002] New energy battery is more and more widely used in life and industry, for example, new energy vehicle equipped with battery has been widely used, in addition, battery is also more and more applied to energy storage field etc..In new energy vehicle equipped with battery, battery can be used to provide power wholly or partially.In energy storage field, battery can be installed in energy storage box or directly installed in user side.

[0003] Explosion-proof valve is installed on the box shell of battery, to prevent explosion risk caused by abnormal conditions such as battery overheating, overcharge, to ensure the safe operation of battery.Explosion-proof valve seals the box shell when battery is working normally, to ensure normal operation of battery;when battery occurs thermal runaway, explosion-proof valve needs to open explosion-proof function in time, to discharge internal gas and heat in time, to reduce the risk of explosion.The piston of explosion-proof valve has the problem of poor sealing performance caused by being blocked by foreign matter. SUMMARY

[0004] The utility model aims at providing a kind of explosion-proof valve, battery pack and electric device, to improve the problem of poor sealing performance of the piston of explosion-proof valve caused by being blocked by foreign matter in prior art.

[0005] According to an aspect of the embodiment of the utility model, the utility model provides a kind of explosion-proof valve, and the explosion-proof valve includes:

[0006] Valve body, is equipped with exhaust hole channel;

[0007] Piston, is movably installed on valve body, to switch between the first position of closing exhaust hole channel and the second position of opening exhaust hole channel, piston is configured to switch to the second position under the action of exhaust pressure of exhaust hole channel;And

[0008] Breathable dustproof diaphragm is installed on the exhaust hole channel of valve body, and in the exhaust direction of exhaust hole channel, dustproof diaphragm is located upstream of piston.

[0009] In some embodiments, the dustproof diaphragm is made of a material that melts when heated.

[0010] In some embodiments, the melting point of the dustproof diaphragm is 60 to 90 degrees Celsius.

[0011] In some embodiments, the dustproof diaphragm has a plurality of air holes, and the diameter of the air holes is 0.2mm to 0.8mm.

[0012] In some embodiments, the dustproof diaphragm is attached to an end surface of the valve body at an upstream end of the valve body along an exhaust direction of the exhaust passage.

[0013] In some embodiments, the dustproof diaphragm is disposed between an intake end and an exhaust end of the exhaust passage, and an edge of the dustproof diaphragm is connected to a peripheral surface of the exhaust passage.

[0014] In some embodiments, the dustproof diaphragm is provided with a vent hole.

[0015] In some embodiments, the explosion-proof valve further comprises:

[0016] a resilient pushing mechanism configured to push the piston towards the first position,

[0017] a protective sleeve sleeved on the resilient pushing mechanism and located at the upstream end of the valve body along the exhaust direction of the exhaust passage.

[0018] In some embodiments, the valve body is provided with a mounting groove for mounting the protective sleeve at an end surface of the upstream end of the valve body along the exhaust direction of the exhaust passage, one end of the protective sleeve is embedded in the mounting groove, and an overflow groove is formed between an outer peripheral surface of the protective sleeve and a groove wall of the mounting groove to accommodate overflow of adhesive connecting the protective sleeve and the valve body.

[0019] In some embodiments, the mounting groove is an annular groove, and an outer diameter of the annular groove is greater than an outer diameter of the protective sleeve to form an annular space around the protective sleeve.

[0020] In some embodiments, the valve body is provided with a mounting hole, and the resilient pushing mechanism comprises:

[0021] a guide rod slidably arranged in the mounting hole, an end of the guide rod away from the dustproof diaphragm being connected to the piston to move with the piston relative to the valve body;

[0022] a resilient component configured to resiliently push the guide rod and drive the guide rod to move the piston towards the first position.

[0023] In some embodiments, the guide rod is provided with a protrusion on a side of the valve body away from the piston, and the resilient component is sleeved on the guide rod and located between the protrusion and the valve body.

[0024] In some embodiments, the explosion-proof valve further comprises a driving component for driving the piston towards the second position.

[0025] In some embodiments, the driving component comprises a magnetic component.

[0026] In some embodiments, when the piston is at the first position, the piston cover is arranged at a downstream end of the valve body along the exhaust direction of the exhaust passage, and when the piston is at the second position, the piston is spaced apart from the downstream end of the valve body along the exhaust direction of the exhaust passage to open the exhaust passage.

[0027] According to another aspect of the present application, a battery pack is also provided, which comprises the explosion-proof valve.

[0028] According to another aspect of the present application, a battery pack is also provided, which comprises the explosion-proof valve.

[0029] The dustproof diaphragm can block the dust or impurities blown to the piston, thereby improving the problem that the dust or impurities blown in the inflation process affect the sealing performance of the explosion-proof valve.

[0030] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings required to be used in the embodiment or prior art description will be briefly introduced below, and obviously, the drawings in the following description can only be some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0032] Figure 1 A structure schematic diagram of a battery pack disclosed by some embodiments of the present application is shown;

[0033] Figure 2 A structure schematic diagram of a battery pack disclosed by some embodiments of the present application is shown;

[0034] Figure 3 A structure schematic diagram of a battery pack disclosed by some embodiments of the present application is shown;

[0035] Figure 4 A structure schematic diagram of a battery pack disclosed by some embodiments of the present application is shown;

[0036] Figure 5 A structure schematic diagram of a battery pack disclosed by some embodiments of the present application is shown;

[0037] Figure 6 A structure schematic diagram of a battery pack disclosed by some embodiments of the present application is shown;

[0038] Figure 7 A structure schematic diagram of a battery pack disclosed by some embodiments of the present application is shown;

[0039] Figure 8 A structure schematic diagram of a battery pack disclosed by some embodiments of the present application is shown; Figure 7 A cross-sectional schematic diagram of the explosion-proof valve at A-A is shown;

[0040] Figure 9 An exploded structural schematic view of a rupture disc is shown. Figure 8 An enlarged view of a portion E is shown.

[0041] Figure 10 An exploded structural schematic view of a rupture disc is shown. Figure 7 A cross-sectional schematic view of the rupture disc shown at B-B is shown.

[0042] Figure 11 Figure 7 A cross-sectional schematic view of the rupture disc shown at F-F is shown.

[0043] Figure 12 An exploded structural schematic view of a rupture disc is shown.

[0044] Figure 13 A bottom structural schematic view of a rupture disc is shown.

[0045] Figure 14 A bottom structural schematic view of a rupture disc is shown.

[0046] In the drawings:

[0047] 1000, vehicle; 100, battery pack; 110, box body; 111, first part; 112, second part; 120, battery monomer; 121, end cover; 121a, electrode terminal; 122, shell; 123, battery cell assembly; 123a, tab; 200, controller; 300, motor; 10, rupture disc; 1, dustproof diaphragm; 11, air hole; 2, guide rod; 21, protruding part; 3, elastic part; 4, sealing ring; 5, valve body; 51, exhaust hole; 52, overflow groove; 53, mounting hole; 54, rib structure; 6, driving part; 7, piston; 8, protective sleeve. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, rather than any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0049] In the description of the present application, it is necessary to point out that, unless otherwise specified, the meaning of "a plurality of" is more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

[0050] The orientation words appearing in the following description are the directions shown in the drawings, and are not a limitation on the specific structure of the present application. In the description of the present application, it is also necessary to point out that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] Further, the "range" disclosed in the present application is limited in the form of lower limit and upper limit, a given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of a particular range. The range defined in this way can include or not include the end value, and can be arbitrarily combined, i.e. any lower limit can be combined with any upper limit to form a range. For example, if the ranges of 60-120 and 80-110 are listed for a particular parameter, it is understood that the ranges of 60-110 and 80-120 are also expected. In addition, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4 and 5 are listed, the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5. In the present application, unless otherwise specified, the numerical range "a-b" represents a shorthand representation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" have been listed herein, and "0-5" is only a shorthand representation of these numerical combinations. In addition, when it is stated that a parameter is an integer ≥ 2, it is equivalent to disclose that the parameter is, for example, an integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0052] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0053] If not particularly specified, all the technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0054] If not particularly specified, all the steps of the present application can be performed in sequence or randomly, preferably in sequence. For example, the method comprises steps (a) and (b), which means that the method can comprise steps (a) and (b) performed in sequence, or steps (b) and (a) performed in sequence. For example, the method can further comprise step (c), which means that step (c) can be added to the method in any order. For example, the method can comprise steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), etc.

[0055] If not particularly specified, the "comprise" and "include" mentioned in the present application are open-ended, and can also be closed. For example, the "comprise" and "include" can mean that other components not listed can also be included or contained, or only the listed components can be included or contained.

[0056] If not particularly specified, in the present application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any one 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) and B is true (or exists); or A and B are both true (or exist).

[0057] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of water power, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0058] Figure 1 A structural schematic diagram of a power battery as a power source is shown; as Figure 1As shown, the power consuming device of the embodiment includes a vehicle 1000, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 is internally provided with a battery pack 100, which 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 supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 is used to control the battery pack 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation and driving.

[0059] In some embodiments of the present application, the battery pack 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0060] Please refer to Figure 2 , Figure 2 An exploded view of the battery pack 100 provided in some embodiments of the present application is shown. The battery pack 100 includes a box body 110 and a battery module arranged in the box body 110, the battery module includes a plurality of battery monomers 120, and the battery monomers 120 are accommodated in the box body 110. Among them, the box body 110 is used to provide an accommodation space for the battery monomers 120, and the box body 110 can adopt various structures. In some embodiments, the box body 110 can include a first part 111 and a second part 112, the first part 111 and the second part 112 are overlapped with each other, and the first part 111 and the second part 112 jointly define an accommodation space for accommodating the battery monomers 120. The second part 112 can be a hollow structure with one end open, and the first part 111 can be a plate structure, the first part 111 is overlapped with 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 can also be hollow structures with one side open, and the open side of the first part 111 is overlapped with 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 have various shapes, such as a cylinder, a cuboid, etc.

[0061] In the battery pack 100, there can be multiple battery cells 120. These multiple battery cells 120 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 120 are connected in both series and parallel. Multiple battery cells 120 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 120 is housed within the casing 110. Alternatively, the battery pack 100 can also consist of multiple battery cells 120 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the casing 110. The battery pack 100 may also include other structures; for example, the battery pack 100 may also include a busbar component for electrical connection between the multiple battery cells 120.

[0062] 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 to these. The battery cell 120 can be cylindrical, flat, cuboid, or other shapes.

[0063] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 120 provided in some embodiments of this application. The battery cell 120 refers to the smallest unit constituting the battery pack 100. For example... Figure 3 The battery cell 120 includes an end cap 121, a housing 122, a cell assembly 123, and other functional components.

[0064] End cap 121 refers to a component that covers the opening of housing 122 to isolate the internal environment of battery cell 120 from the external environment. The shape of end cap 121 can be adapted to the shape of housing 122 to fit it. Optionally, end cap 121 can be made of a material with certain hardness and strength, such as aluminum alloy, so that end cap 121 is less prone to deformation under pressure and impact, giving battery cell 120 higher structural strength and improved safety performance. Functional components such as electrode terminals 121a can be provided on end cap 121. Electrode terminals 121a can be used for electrical connection with cell assembly 123 for outputting or inputting electrical energy from battery cell 120. In some embodiments, end cap 121 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 120 reaches a threshold. The end cap 121 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations 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. For example, the insulating member can be plastic, rubber, etc.

[0065] The shell 122 is a component for cooperating with the end cover 121 to form an internal environment of the battery monomer 120, wherein the formed internal environment can be used to accommodate the battery cell assembly 123, electrolyte and other components. The shell 122 and the end cover 121 can be independent components, and an opening can be provided on the shell 122, and the end cover 121 is covered on the opening to form the internal environment of the battery monomer 120. Without limitation, the end cover 121 and the shell 122 can also be integrated, specifically, the end cover 121 and the shell 122 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 122, the end cover 121 is covered on the shell 122. The shell 122 can be various shapes and various sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 122 can be determined according to the specific shape and size of the battery cell assembly 123. The material of the shell 122 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations.

[0066] The battery cell assembly 123 is a component in which an electrochemical reaction occurs in the battery monomer 120. One or more battery cell assemblies 123 can be contained in the shell 122. The battery cell assembly 123 is mainly formed by winding or stacking the electrode sheet, wherein the electrode sheet includes a positive electrode sheet and a negative electrode sheet, and an isolation film is usually provided between the positive electrode sheet and the negative electrode sheet.

[0067] The electrode sheet mainly includes a sheet-shaped current collector and an active material coated on the current collector. The positive electrode sheet (cathode electrode sheet) and the negative electrode sheet (anode electrode sheet) have a part of the active material to form a main body of the battery cell assembly, and a part of the positive electrode sheet and the negative electrode sheet without the active material each form a tab 123a. The positive electrode tab and the negative electrode tab can be located at one end of the main body or at two ends of the main body respectively. In 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 tab 123a connects the electrode terminal to form a current loop.

[0068] In order to ensure the safe and stable operation of the battery pack, it is necessary to prevent water and dust, that is, the battery pack needs to be in a sealed state in theory, but in the sealed state, once the battery cell of the battery pack 100 is short-circuited or a thermal runaway event occurs, a large amount of gas will be generated, and the gas pressure in the internal environment of the battery pack 100 will rapidly rise. If the gas cannot be discharged and pressure released in time, it may cause a violent fire or explosion, causing serious casualties and property losses. Referring to Figure 4 , the existing technical solution is to install an explosion-proof valve 10 on the box body 110 of the battery pack 100, which can be opened under the pressure of the gas generated by the battery pack 100 to meet the needs of waterproofing, explosion-proofing, gas discharge and pressure relief of the power battery system.

[0069] When the sealing performance of the battery pack 100 is tested, the piston of the explosion-proof valve 10 is opened, and a gas for testing the sealing performance is filled into the box 110 of the battery pack 100 through the explosion-proof valve 10. During the process of filling the gas into the box 110, impurities and dust in the box can be blown up, and the blown-up dust or impurities can fall on the piston of the explosion-proof valve 10, thereby affecting the sealing performance of the piston and causing poor sealing of the explosion-proof valve.

[0070] To improve the above problems, the present embodiment provides a new type of explosion-proof valve, which is shown in Figures 5 to 11 The explosion-proof valve of the present embodiment includes a valve body 5, a piston 7, and a dust-proof diaphragm 1. The valve body 5 is provided with an exhaust channel 51. The piston 7 is movably installed on the valve body 5 to switch between a first position for closing the exhaust channel 51 and a second position for opening the exhaust channel 51, and the piston 7 is configured to switch to the second position under the action of the exhaust pressure of the exhaust channel 51.

[0071] The dust-proof diaphragm 1 is installed on the exhaust channel 51 of the valve body 5 and is located upstream of the piston 7 in the exhaust direction of the exhaust channel 51. The gas generated when the battery pack 100 is in thermal runaway is discharged from the inside of the battery pack 100 to the outside through the exhaust channel 51 of the explosion-proof valve 10, so the exhaust direction of the exhaust channel 51 is from the inside of the battery pack 100 to the outside, and the dust-proof diaphragm 1 is located upstream of the piston 7 in the exhaust direction of the exhaust channel 51, i.e., the dust-proof diaphragm 7 is located on the inner side of the piston 7.

[0072] When the sealing performance of the battery pack 100 is tested, the piston 7 of the explosion-proof valve 10 is opened, and a gas is filled into the box 110 of the battery pack 100, and the dust-proof diaphragm 1 can block the blown-up dust or impurities from moving to the piston 7, thereby improving the problem that the blown-up dust or impurities affect the sealing performance of the explosion-proof valve 10 during the gas filling process.

[0073] In some embodiments, the dust-proof diaphragm 1 is made of a material that melts when heated. In some embodiments, the melting point of the dust-proof diaphragm 1 is 60 to 90 degrees Celsius. Preferably, the melting point of the dust-proof diaphragm 1 is preferably 70 to 80 degrees Celsius.

[0074] In some embodiments, the material of the dust-proof diaphragm 1 is a polyolefin POE (polyolefin elastomer material) film or an EVA (ethylene-vinyl acetate copolymer) film.

[0075] The high-temperature gas discharged when the battery is in thermal runaway can melt the dust-proof diaphragm 1, and the gas generated when the battery pack 100 is in thermal runaway can be quickly discharged to the outside of the battery pack 100 through the explosion-proof valve 10, which is conducive to ensuring that the explosion-proof valve explodes when the battery pack 100 is in thermal runaway.

[0076] In some embodiments, the dustproof film 1 has a plurality of micro air permeable holes with a diameter of 0.2mm to 0.8mm, and optionally, the diameter of the air permeable holes is 0.5mm. When the battery pack 100 is subjected to a sealing performance test, the piston 7 of the explosion-proof valve 10 is opened to fill the box 110 of the battery pack 100 with gas, which can enter the inside of the box of the battery pack 100 through the dustproof film 1.

[0077] In the present embodiment, the dustproof film 1 is attached to the end face of the upstream end of the valve body 5 along the exhaust direction of the exhaust channel 51. The end face of the upstream end of the valve body 5 along the exhaust direction of the exhaust channel 51 (i.e., the inner side of the valve body 5) is a flat surface, and the dustproof film 1 is attached to the flat surface and covers the exhaust channel 51.

[0078] Referring to Figure 11 When the battery pack 100 is subjected to a gas tightness test, gas (see the arrow in Figure 11 ) enters the battery pack 100 from the position of the piston 7 through the dustproof film 1, and the air permeable holes on the dustproof film 1 can effectively prevent impurities or dust in the battery pack from falling into the inner cavity of the valve body 5. The dustproof film is a low-melting thin film, and when the battery pack experiences thermal runaway, the high-temperature gas inside the battery pack will quickly melt the dustproof film 1, the gas will push the piston 7 out to the outside of the battery pack 100, and the dustproof film 1 can achieve smooth entry of gas into the pack during inflation, block dust and impurities in the pack, and also not affect the discharge of high-temperature gas when the battery pack experiences thermal runaway.

[0079] In some embodiments, the explosion-proof valve further comprises an elastic pushing mechanism and a protective sleeve 8. The elastic pushing mechanism is configured to push the piston 7 towards the first position, and the protective sleeve 8 is sleeved on the elastic pushing mechanism and located at the upstream end of the valve body 5 along the exhaust direction of the exhaust channel 51. Placing the elastic pushing mechanism in the protective sleeve 8 can effectively prevent dust or impurities from contaminating the elastic pushing mechanism, thereby ensuring the smoothness of the movement of the piston 7 driven by the elastic pushing mechanism.

[0080] In some embodiments, the end face of the upstream end of the valve body 5 along the exhaust direction of the exhaust channel 51 is provided with a mounting groove for mounting the protective sleeve 8, one end of the protective sleeve 8 is embedded in the mounting groove, and an overflow groove 52 is formed between the outer circumferential surface of the protective sleeve 8 and the groove wall of the mounting groove to accommodate the overflow of the adhesive glue connecting the protective sleeve 8 and the valve body 5. The mating position of the protective sleeve 8 and the valve body 5 is provided with an overflow groove, which can effectively prevent glue from overflowing onto the bonding plane of the dustproof film 1 and the valve body 5.

[0081] In some embodiments, the mounting groove is an annular groove, and the outer diameter of the annular groove is greater than the outer diameter of the protective sleeve 8 to form a circumferential groove on the outer periphery of the protective sleeve 8.

[0082] In some embodiments, the valve body 5 is provided with a mounting hole 53, and the elastic pushing mechanism includes a guide rod 2 and an elastic component 3. The guide rod 2 is slidably arranged in the mounting hole 53, and an end of the guide rod 2 away from the dustproof diaphragm 1 is connected with the piston 7 to move with the piston 7 relative to the valve body 5; the elastic component 3 is configured to elastically push the guide rod 2 and drive the guide rod 2 to move the piston 7 towards the first position.

[0083] In some embodiments, the guide rod 2 is provided with a protrusion 21 on a side of the valve body 5 away from the piston 7, and the elastic component 3 is sleeved on the guide rod 2 and located between the protrusion 21 and the valve body 5. The elastic component 3 is located on a side of the valve body 5 close to the dustproof diaphragm 1 and between the protrusion 21 and the valve body 5, so as to push the piston 7 towards the outlet of the exhaust channel 51 through the guide rod 2 to close the exhaust channel 51.

[0084] The explosion-proof valve further includes a sealing ring 4 arranged on the inner side of the valve body 5 to seal the valve body 5 and the box body 110 of the battery pack 100. The valve body 5 protrudes radially from the protective sleeve 8 of the dustproof diaphragm 1. The box body 110 of the battery pack 100 is provided with a through hole matched with the protective sleeve 8, and the dustproof diaphragm 1 of the explosion-proof valve is inserted into the through hole. The sealing ring 4 is sleeved outside the dustproof diaphragm 1 and located between the outer surfaces of the valve body and the box body 110 to achieve the sealing of the battery pack 100.

[0085] Referring to Figure 5 , the valve body 5 is provided with a plurality of exhaust channels 51 arranged circumferentially along the elastic pushing mechanism (including the guide rod 2 and the elastic component 3, etc.). The cylindrical component of the dustproof diaphragm 1 is sleeved outside the elastic pushing mechanism and the plurality of exhaust channels 51.

[0086] In some embodiments, the valve body 5 is a flat disc structure. A rib structure 54 is formed between two adjacent exhaust channels 51.

[0087] In some embodiments, the explosion-proof valve further includes a driving component 6 for driving the piston 7 towards the second position. When the box body 110 of the battery pack 100 is filled with gas to detect the sealing of the battery pack 100, the piston is opened by the driving component 6, so that the gas enters the inside of the battery pack along the direction of the arrow in Figure 11 .

[0088] In some embodiments, the driving component 6 includes a magnetic component, such as a steel sheet. The driving component 6 is moved to the outside of the valve body 5 by the magnetic component outside the battery pack 100, and the driving component 6 drives the piston 7 to move to the second position of the opening exhaust channel 51 outside the valve body 5, thereby opening the exhaust channel.

[0089] In some embodiments, when the piston 7 is in the first position, the piston 7 covers the downstream end of the valve body 5 along the exhaust direction of the exhaust channel 51, and when the piston 7 is in the second position, the piston 7 is spaced from the downstream end of the valve body 5 along the exhaust direction of the exhaust channel 51 to open the exhaust channel 51.

[0090] Referring to Figures 12 to 14 In some embodiments, the dustproof diaphragm 1 is arranged between the intake end and the exhaust end of the exhaust channel 51, and the edge of the dustproof diaphragm 1 is connected to the peripheral surface of the exhaust channel 51.

[0091] In the embodiment, the dustproof diaphragm 1 is arranged in the exhaust channel 51 and perpendicular to the extension direction of the exhaust channel 51 to block the dust or impurities blown up from moving towards the piston 7 to affect the sealing performance of the piston 7.

[0092] In some embodiments, the dustproof diaphragm 1 is provided with the vent hole 11. When the battery pack 100 is subjected to the air tightness test, the gas passes through the dustproof diaphragm 1 from the position of the piston 7 into the battery pack 100, and the vent hole 11 on the dustproof diaphragm 1 can effectively prevent the impurities or dust in the battery pack from falling back into the inner cavity of the valve body 5. When the battery pack is in thermal runaway, the gas pushes the piston 7 to be discharged to the outside of the battery pack 100, and the dustproof diaphragm 1 can realize the smooth entry of the gas into the battery pack during inflation and block the dust and impurities in the battery pack, and does not affect the discharge of the high-temperature gas when the battery pack is in thermal runaway.

[0093] The above is only an exemplary embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An explosion relief valve, characterized in that Comprising: a valve body (5) provided with an exhaust passage (51); a piston (7) movably mounted on the valve body (5) to switch between a first position closing the exhaust passage (51) and a second position opening the exhaust passage (51), the piston (7) being configured to switch to the second position under the action of exhaust pressure of the exhaust passage (51); and a gas-permeable dustproof diaphragm (1) mounted on the exhaust passage (51) of the valve body (5), the dustproof diaphragm (1) being located upstream of the piston (7) in the exhaust direction of the exhaust passage (51).

2. The explosion relief valve of claim 1, wherein The dustproof diaphragm (1) is made of a material that melts when heated.

3. Explosion relief valve according to claim 1 or 2, characterized in that The melting point of the dustproof diaphragm (1) is 60-90 degrees Celsius.

4. The explosion relief valve of claim 1, wherein, The dustproof diaphragm (1) has a plurality of gas-permeable holes with a diameter of 0.2-0.8 mm.

5. The explosion relief valve of claim 1, wherein, The dustproof diaphragm (1) is attached to the end face of the valve body (5) at the upstream end in the exhaust direction of the exhaust passage (51).

6. The explosion relief valve of claim 1, wherein, The dustproof diaphragm (1) is arranged between the intake end and the exhaust end of the exhaust passage (51), and the edge of the dustproof diaphragm (1) is connected to the peripheral surface of the exhaust passage (51).

7. The explosion relief valve of claim 6, wherein, The dustproof diaphragm (1) is provided with a vent hole (11).

8. The explosion relief valve of claim 1, wherein, Further comprising: a resilient pushing mechanism configured to push the piston (7) towards the first position, a protective sleeve (8) sleeved on the resilient pushing mechanism and located at the upstream end of the valve body (5) in the exhaust direction of the exhaust passage (51).

9. The explosion relief valve of claim 8, wherein, The valve body (5) is provided with a mounting groove on the end face of the upstream end in the exhaust direction of the exhaust passage (51) for mounting the protective sleeve (8), one end of the protective sleeve (8) is embedded in the mounting groove, and an overflow accommodating adhesive groove (52) connecting the protective sleeve (8) and the valve body (5) is formed between the outer peripheral surface of the protective sleeve (8) and the groove wall of the mounting groove.

10. The explosion relief valve of claim 9, wherein, The mounting groove is an annular groove, and the outer diameter of the annular groove is greater than the outer diameter of the protective sleeve (8) to form the overflow accommodating adhesive groove (52) on the outer periphery of the protective sleeve (8).

11. The explosion relief valve of claim 8, wherein, The valve body (5) is provided with a mounting hole (53), and the resilient pushing mechanism comprises: a guide rod (2) slidably penetrating the mounting hole (53), one end of the guide rod (2) away from the dustproof diaphragm (1) being connected to the piston (7) to move with the piston (7) relative to the valve body (5); a resilient component (3) configured to resiliently push the guide rod (2) and move the piston (7) towards the first position.

12. The explosion relief valve of claim 11, wherein, The guide rod (2) is provided with a protruding portion (21) located on the side of the valve body (5) away from the piston (7), and the resilient component (3) is sleeved on the guide rod (2) and located between the protruding portion (21) and the valve body (5).

13. The explosion relief valve of claim 1, wherein, Further comprising a driving component (6) for driving the piston (7) towards the second position.

14. The explosion relief valve of claim 13, wherein, The driving component (6) comprises a magnetic component.

15. The explosion relief valve of claim 14, wherein, When the piston (7) is in the first position, the piston (7) covers a downstream end of the valve body (5) in an exhaust direction of the exhaust passage (51), and when the piston (7) is in the second position, the piston (7) is spaced from the downstream end of the valve body (5) in the exhaust direction of the exhaust passage (51) to open the exhaust passage (51).

16. A battery pack, characterized by An explosion relief valve comprising any one of claims 1 to 15.

17. An electrical device, comprising: A battery pack comprising the explosion relief valve of claim 16.

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