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); the air-permeable dustproof component (1) is installed on the exhaust hole channel (51) of the valve body (5), and the dustproof component (1) is located on the upstream of the piston (7) in the exhaust direction of the exhaust hole channel (51).

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to an explosion-proof valve, a battery pack, and an electrical device. Background Technology

[0002] The application of new energy batteries in daily life and industry is becoming increasingly widespread. For example, new energy vehicles equipped with batteries are already widely used, and batteries are also increasingly being applied in energy storage. In new energy vehicles equipped with batteries, the batteries can provide all or part of the power. In the field of energy storage, batteries can be installed in energy storage boxes or directly on the user side.

[0003] The battery casing is equipped with an explosion-proof valve to prevent the risk of explosion caused by abnormal conditions such as overheating or overcharging, ensuring the safe operation of the battery. When the battery is operating normally, the explosion-proof valve seals the casing to ensure normal operation. In the event of thermal runaway, the explosion-proof valve needs to open promptly to release internal gases and heat, thereby reducing the risk of explosion. However, the piston of the explosion-proof valve can be jammed by foreign objects, leading to poor sealing performance. Utility Model Content

[0004] The present invention aims to provide an explosion-proof valve, a battery pack, and an electrical device to improve the problem of poor sealing performance of the piston of the explosion-proof valve in the prior art due to being stuck by foreign objects.

[0005] According to one aspect of the present invention, the present invention provides an explosion-proof valve, the explosion-proof valve comprising:

[0006] The valve body is equipped with an exhaust port;

[0007] A piston, movably mounted on the valve body, is configured to switch between a first position closing the exhaust passage and a second position opening the exhaust passage, the piston being configured to switch to the second position under the action of exhaust pressure in the exhaust passage; and

[0008] A breathable dustproof component is installed on the exhaust port of the valve body, and the dustproof component is located upstream of the piston in the exhaust direction of the exhaust port.

[0009] In some embodiments, a dustproof component is provided on the upstream end of the exhaust duct along the exhaust direction.

[0010] In some embodiments, the dustproof component includes a dustproof net covering the upstream end of the exhaust duct in the exhaust direction.

[0011] In some embodiments, the dustproof component further includes a bracket, one end of which is connected to the valve body, and a dustproof net is installed at the end of the bracket away from the valve body.

[0012] In some embodiments, the support includes a cylindrical component, one end of which near the valve body communicates with an exhaust channel, and a dustproof mesh is disposed at the end of the cylindrical component away from the valve body.

[0013] In some embodiments, the valve body is provided with a snap-fit ​​structure for connecting a bracket.

[0014] In some embodiments, the explosion-proof valve further includes a resilient pushing mechanism configured to push the piston toward a first position, the resilient pushing mechanism being enclosed within a dustproof component.

[0015] In some embodiments, the valve body is provided with a mounting hole, and the elastic pushing mechanism includes:

[0016] The guide rod is slidably inserted into the mounting hole, and the end of the guide rod away from the dustproof component is connected to the piston so that it moves with the piston relative to the valve body.

[0017] The elastic component is configured to elastically push the guide rod so that the guide rod drives the piston to move toward the first position.

[0018] In some embodiments, a protrusion is provided on the guide rod, the protrusion being located on the side of the valve body away from the piston, and an elastic member is sleeved on the guide rod and located between the protrusion and the valve body.

[0019] In some embodiments, the explosion-proof valve further includes a drive component for driving the piston toward a second position.

[0020] In some embodiments, the driving component includes a magnetic attraction component.

[0021] In some embodiments, when the piston is in the first position, the piston cover is disposed at the downstream end of the valve body along the exhaust direction of the exhaust passage, and when the piston is in 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.

[0022] According to another aspect of the present invention, a battery pack is also provided, the battery pack including the explosion-proof valve described above.

[0023] According to another aspect of the present invention, an electrical device is also provided, which includes the battery pack described above.

[0024] By applying the technical solution of this application, the dustproof component can prevent blown dust or impurities from moving toward the piston, thereby improving the problem that blown dust or impurities during the inflation process affect the sealing performance of the explosion-proof valve.

[0025] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 The present application provides a schematic diagram of the structure of an electrical device according to some embodiments thereof.

[0028] Figure 2 An exploded structural diagram of a battery pack disclosed in some embodiments of this application is shown;

[0029] Figure 3 The present application shows a schematic diagram of the structure of a battery cell disclosed in some embodiments;

[0030] Figure 4 The present application shows a schematic diagram of the structure of a battery pack disclosed in some embodiments;

[0031] Figure 5 A schematic diagram of the structure of an explosion-proof valve disclosed in some embodiments of this application is shown;

[0032] Figure 6 An exploded structural diagram of an explosion-proof valve disclosed in some embodiments of this application is shown;

[0033] Figure 7 The diagram shows a front view of an explosion-proof valve disclosed in some embodiments of this application;

[0034] Figure 8 A cross-sectional structural schematic diagram of an explosion-proof valve disclosed in some embodiments of this application is shown;

[0035] Figure 9 The diagram shown is a bottom view of an explosion-proof valve disclosed in some embodiments of this application;

[0036] Figure 10 This application shows a schematic diagram of the structure of a dustproof component of an explosion-proof valve, as disclosed in some embodiments.

[0037] Figure 11 The diagram shows a structural schematic of the valve body of an explosion-proof valve disclosed in some embodiments of this application;

[0038] Figure 12 This application shows a top view of the valve body of an explosion-proof valve according to some embodiments; and

[0039] Figure 13A cross-sectional structural schematic diagram of the valve body of an explosion-proof valve disclosed in some embodiments of this application is shown.

[0040] In the picture:

[0041] 1000, Vehicle; 100, Battery Pack; 110, Housing; 111, First Part; 112, Second Part; 120, Battery Cell; 121, End Cap; 121a, Electrode Terminal; 122, Housing; 123, Cell Assembly; 123a, Tab; 200, Controller; 300, Motor; 10, Explosion-proof Valve; 1, Dustproof Component; 11, Dustproof Net; 12, Bracket; 2, Guide Rod; 21, Protrusion; 3, Elastic Component; 4, Second Sealing Ring; 5, Valve Body; 51, Exhaust Channel; 52, Snap-fit ​​Structure; 53, Mounting Hole; 54, Rib Structure; 6, Drive Component; 7, Piston; 8, First Sealing Ring. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0043] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0044] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0045] Furthermore, the "range" disclosed in this application is defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of the particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is also expected that ranges of 60-110 and 80-120 are also included. Furthermore, if minimum range values ​​1 and 2 are listed, and if maximum range values ​​3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0046] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0047] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0048] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0049] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0050] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: 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 both A and B are true (or exist).

[0051] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0052] Figure 1 A schematic diagram of an electrical device using a battery as a power source is shown; for example... Figure 1 As shown, the electrical device in this embodiment includes a vehicle 1000, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery pack 100 is disposed inside the vehicle 1000, and the battery pack 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery pack 100 can be used to power the vehicle 1000; for example, the battery pack 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also 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, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0053] In some embodiments of this application, the battery pack 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0054] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery pack 100 provided in some embodiments of this application. The battery pack 100 includes a housing 110 and a battery module disposed within the housing 110. The battery module includes a plurality of battery cells 120, which are housed within the housing 110. The housing 110 provides a receiving space for the battery cells 120, and the housing 110 can adopt various structures. In some embodiments, the housing 110 may include a first portion 111 and a second portion 112, which overlap each other, and the first portion 111 and the second portion 112 together define a receiving space for accommodating the battery cells 120. The second part 112 can be a hollow structure with one end open, and the first part 111 can 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 together define the accommodating space. Alternatively, the first part 111 and the second part 112 can 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 110 formed by the first part 111 and the second part 112 can be of various shapes, such as a cylinder, a cuboid, etc.

[0055] 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.

[0056] 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.

[0057] Please refer to Figure 3 , Figure 3This 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.

[0058] 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.

[0059] The housing 122 is a component used to cooperate with the end cap 121 to form the internal environment of the battery cell 120, wherein the formed internal environment can accommodate the 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 can be used to close the opening to form the internal environment of the battery cell 120. Alternatively, the end cap 121 and the housing 122 can be integrated. Specifically, the end cap 121 and the housing 122 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 122, the end cap 121 closes the housing 122. The housing 122 can have 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 cell assembly 123. The shell 122 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0060] The cell assembly 123 is the component in the battery cell 120 where the electrochemical reaction takes place. The housing 122 may contain one or more cell assemblies 123. The cell assembly 123 is mainly formed by winding or stacking electrode sheets, wherein the electrode sheets include positive electrode sheets and negative electrode sheets, and a separator is usually provided between the positive electrode sheets and the negative electrode sheets.

[0061] The electrode mainly consists of a thin sheet-like current collector and an active material coated on the current collector. The portions of the positive electrode (cathode electrode) and negative electrode (anode electrode) containing active material constitute the main body of the battery cell assembly, while the portions of the positive and negative electrodes without active material each constitute tabs 123a. The positive and negative tabs can be located together at one end of the main body or at opposite ends of the main body. During the charging and discharging process of the battery pack 100, the positive and negative active materials react with the electrolyte, and the tabs 123a connect to the electrode terminals to form a current loop.

[0062] To ensure the safe and stable operation of the battery pack, it needs to be waterproof and dustproof, meaning the battery pack theoretically needs to be sealed. However, even in a sealed state, if a cell in the battery pack 100 short-circuits or experiences thermal runaway, it will generate a large amount of gas, causing a rapid increase in the internal gas pressure of the battery pack 100's casing 110. If the gas cannot be vented and depressurized in time, it may lead to a violent fire or explosion, causing significant personal injury and property damage. See also Figure 4 Therefore, the current technical solution is to install an explosion-proof valve 10 on the housing 110 of the battery pack 100, which can be opened under the pressure of the gas generated by the battery pack 100, in order to meet the requirements of waterproofing, explosion-proofing, and venting and depressurization of the power battery system.

[0063] When testing the sealing performance of the battery pack 100, the piston of the explosion-proof valve 10 is opened, and gas for testing the sealing performance is introduced into the housing 110 of the battery pack 100 through the explosion-proof valve 10. During the process of introducing gas into the housing 110, impurities and dust inside the housing will be blown up. The blown-up dust or impurities will fall onto the piston of the explosion-proof valve 10 and affect the sealing performance of the piston, causing the explosion-proof valve to be poorly sealed.

[0064] To address the aforementioned issues, this embodiment provides a novel explosion-proof valve, see [link to relevant documentation]. Figures 5 to 8 The explosion-proof valve includes a valve body 5, a piston 7, and a dustproof component 1. The valve body 5 is provided with an exhaust passage 51. The piston 7 is movably mounted on the valve body 5 to switch between a first position with the exhaust passage 51 closed and a second position with the exhaust passage 51 open. The piston 7 is configured to switch to the second position under the action of the exhaust pressure of the exhaust passage 51.

[0065] A breathable dustproof component 1 is installed on the exhaust port 51 of the valve body 5. In the exhaust direction of the exhaust port 51, the dustproof component 1 is located upstream of the piston 7. When the battery pack 100 experiences thermal runaway, the gas generated is discharged from the inside of the battery pack to the outside through the exhaust port 51 of the explosion-proof valve 10. Therefore, the exhaust direction of the exhaust port 51 is from the inside of the battery pack 100 to the outside. The dustproof component 1 is located upstream of the piston 7 in the exhaust direction of the exhaust port 51, that is, the dustproof component 7 is located inside the piston 7.

[0066] When testing the sealing performance of the battery pack 100, the piston 7 of the explosion-proof valve 10 is opened to fill the housing 110 of the battery pack 100 with gas. The dustproof component 1 can prevent the blown dust or impurities from moving toward the piston 7, thereby improving the problem of the blown dust or impurities affecting the sealing performance of the explosion-proof valve 10 during the inflation process.

[0067] In some embodiments, the dustproof component 1 is installed at the upstream end of the exhaust channel 51 along the exhaust direction, which helps to prevent dust or impurities from entering the exhaust channel 51 and thus ensures the unobstructed flow of the exhaust channel 51. In addition, installing the dustproof component 1 at the upstream end of the exhaust channel 51 has advantages over installing the dustproof component 1 inside the exhaust channel 51, such as simple structure, easy installation, easy maintenance and lower cost.

[0068] In some embodiments, further combined Figure 9 and 10 As shown, the dustproof component 1 includes a dustproof net 11 covering the upstream end of the exhaust channel 51 along the exhaust direction. The dustproof net 11 can effectively prevent the aforementioned dust or impurities from entering the exhaust channel 51 and reaching the piston 7, which helps to ensure the sealing performance of the piston 7 and the unobstructed flow of the exhaust channel 51.

[0069] In some embodiments, the dustproof component 1 further includes a bracket 12, one end of which is connected to the valve body 5, and a dustproof net 11 is installed at the end of the bracket 12 away from the valve body 5. The dustproof net 11 is connected to the valve body 5 through the bracket 12, so that the dustproof net 11 and the end face of the valve body 5 are spaced apart by a certain distance. This helps to prevent poor exhaust due to the accumulation of parts and the deposition of dust or impurities, and helps to ensure the normal operation of the explosion-proof valve 10.

[0070] In some embodiments, the support 12 includes a cylindrical component, one end of which, near the valve body 5, communicates with the exhaust port 51, and a dustproof net 11 is disposed at the end of the cylindrical component away from the valve body 5. When a large amount of gas is generated in the battery pack 100 due to thermal runaway, the gas enters the cylindrical component through the dustproof net 11 and acts on the piston 7 to push the piston 7 to a second position that opens the exhaust port 51, thereby venting the gas in the battery pack 100 to the outside of the battery pack 100 through the explosion-proof valve 10 to prevent the battery pack 100 from exploding due to high-pressure gas.

[0071] In some embodiments, the valve body 5 is provided with a snap-fit ​​structure 52 for connecting the bracket 12. The dustproof component 1 is installed on the valve body 5 through the snap-fit ​​structure, which has the advantages of simple structure, easy installation and high assembly efficiency.

[0072] In some embodiments, the explosion-proof valve 10 further includes an elastic pushing mechanism configured to push the piston 7 toward a first position, the elastic pushing mechanism being enclosed within the dustproof component 1. Enclosing the elastic pushing mechanism within the dustproof component 1 effectively prevents dust or impurities from contaminating the elastic pushing mechanism, thereby ensuring the smoothness of the elastic pushing mechanism driving the piston 7.

[0073] 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 inserted into the mounting hole 53, and the end of the guide rod 2 away from the dustproof component 1 is connected to the piston 7 so as to move with the piston 7 relative to the valve body 5.

[0074] The piston 7 is positioned on the side of the valve body 5 away from the dustproof component 1, that is, the piston 7 covers the downstream end face of the valve body 5 along the exhaust direction of the exhaust passage 51 to seal the outlet of the exhaust passage 51. The guide rod 2 passes through the mounting hole 53 from the side of the valve body 1 adjacent to the dustproof component 1 and is connected to the piston 7.

[0075] The elastic member 3 is configured to elastically push the guide rod 2, causing the guide rod 2 to move the piston 7 toward a first position. In some embodiments, the guide rod 2 is provided with a protrusion 21, which is located on the side of the valve body 5 away from the piston 7. The elastic member 3 is sleeved on the guide rod 2 and located between the protrusion 21 and the valve body 5. The elastic member 3 is located on the side of the valve body 5 closer to the dustproof member 1 and between the protrusion 21 and the valve body, so as to push the piston 7 toward the outlet of the exhaust passage 51 through the guide rod 2 to close the exhaust passage 51.

[0076] See Figure 6 and Figure 8 The explosion-proof valve also includes a first sealing ring 8 disposed between the piston 7 and the valve body 5. The first sealing ring 8 is sleeved on the outside of the exhaust channel 51, and the first sealing ring 8 cooperates with the piston 7 to seal the exhaust channel 51.

[0077] The explosion-proof valve also includes a second sealing ring 4 located inside the valve body 5 for sealing the valve body 5 and the housing 110 of the battery pack 100. The valve body 5 protrudes radially from the bracket 12 of the dustproof component 1. The housing 110 of the battery pack 100 has a through hole adapted to the bracket 12. The dustproof component 1 of the explosion-proof valve is inserted into the through hole, and the second sealing ring 4 is sleeved on the outside of the dustproof component 1 and located between the outer surfaces of the valve body and the housing 110 to achieve a seal of the battery pack 100.

[0078] Furthermore, combined Figures 11 to 13 As shown, the valve body 5 is provided with multiple exhaust channels 51, which are arranged circumferentially along the elastic pushing mechanism (including guide rod 2 and elastic component 3, etc.). The cylindrical component of the dustproof component 1 is sleeved on the elastic pushing mechanism and the multiple exhaust channels 51.

[0079] In some embodiments, the valve body 5 has a flat, disc-shaped structure. A rib structure 54 is formed between two adjacent exhaust channels 51.

[0080] In some embodiments, the explosion-proof valve further includes a drive component 6 for driving the piston 7 toward a second position. The piston is opened by the drive component 6 when gas is introduced into the housing 110 of the battery pack 100 to test the sealing of the battery pack 100.

[0081] In some embodiments, the drive component 6 includes a magnetic component. The magnetic component drives the outer side of the outer valve body 5 of the drive component 6 to move, thereby moving the piston 7 to a second position on the outer side of the valve body 5 to open the exhaust passage 51, thus opening the exhaust passage.

[0082] 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 passage 51. When the piston 7 is in the second position, the piston 7 is spaced apart from the downstream end of the valve body 5 along the exhaust direction of the exhaust passage 51 to open the exhaust passage 51.

[0083] The above are merely exemplary embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An explosion-proof valve, characterized in that, include: The valve body (5) is provided with an exhaust port (51); A piston (7) is movably mounted on the valve body (5) to switch between a first position of closing the exhaust passage (51) and a second position of opening the exhaust passage (51), the piston (7) being configured to switch to the second position under the action of the exhaust pressure of the exhaust passage (51); as well as A breathable dustproof component (1) is installed on the exhaust port (51) of the valve body (5), and the dustproof component (1) is located upstream of the piston (7) in the exhaust direction of the exhaust port (51).

2. The explosion-proof valve according to claim 1, characterized in that, The dustproof component (1) is installed on the upstream end of the exhaust channel (51) along the exhaust direction.

3. The explosion-proof valve according to claim 1, characterized in that, The dustproof component (1) includes a dustproof net (11) covering the upstream end of the exhaust channel (51) along the exhaust direction.

4. The explosion-proof valve according to claim 3, characterized in that, The dustproof component (1) also includes a bracket (12), one end of which is connected to the valve body (5), and the dustproof net (11) is installed at the end of the bracket (12) away from the valve body (5).

5. The explosion-proof valve according to claim 4, characterized in that, The bracket (12) includes a cylindrical component, one end of which near the valve body (5) is connected to the exhaust channel (51), and the dustproof net (11) is disposed at the end of the cylindrical component away from the valve body (5).

6. The explosion-proof valve according to claim 4, characterized in that, The valve body (5) is provided with a snap-fit ​​structure (52) for connecting the bracket (12).

7. The explosion-proof valve according to any one of claims 1 to 6, characterized in that, It also includes an elastic pressing mechanism configured to push the piston (7) toward the first position, the elastic pressing mechanism being enclosed within the dustproof component (1).

8. The explosion-proof valve according to claim 7, characterized in that, The valve body (5) is provided with a mounting hole (53), and the elastic pushing mechanism includes: A guide rod (2) is slidably inserted into the mounting hole (53), and one end of the guide rod (2) away from the dustproof component (1) is connected to the piston (7) so as 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) so that the guide rod (2) drives the piston (7) to move toward the first position.

9. The explosion-proof valve according to claim 8, characterized in that, The guide rod (2) is provided with a protrusion (21), which is located on the side of the valve body (5) away from the piston (7). The elastic member (3) is sleeved on the guide rod (2) and located between the protrusion (21) and the valve body (5).

10. The explosion-proof valve according to claim 1, characterized in that, It also includes a drive component (6) for driving the piston (7) toward the second position.

11. The explosion-proof valve according to claim 10, characterized in that, The driving component (6) includes a magnetic suction component.

12. The explosion-proof valve according to claim 11, characterized in that, 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 passage (51). When the piston (7) is in the second position, the piston (7) is spaced apart from the downstream end of the valve body (5) along the exhaust direction of the exhaust passage (51) to open the exhaust passage (51).

13. A battery pack, characterized in that, The explosion-proof valve includes any one of claims 1 to 12.

14. An electrical appliance, characterized in that, Includes the battery pack as described in claim 13.

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