Explosion-proof valve, battery device and electric equipment

Abstract

The utility model relates to an anti-explosion valve, a battery device and electric equipment. The anti-explosion valve comprises a valve body, a valve element assembly and a limiting piece, and a first through hole penetrating through the valve body is formed in the valve body. The valve element assembly is arranged on the valve body and comprises a valve deck, and the valve deck is located at the first position where the first through hole is covered and can be far away from the first position under the action of external force and open the first through hole. And the limiting piece is configured to be clamped between the valve cover and the valve body after the valve cover is far away from the first position, and can prevent the valve cover from being reset to the first position. After the explosion-proof valve is opened to a certain degree, the explosion-proof valve is kept in a normally open state, gas in the battery device is continuously released until the gas is completely exhausted, the gas is prevented from being burnt and exploded again, and the reliability of the explosion-proof function of the battery device is improved.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to explosion-proof valves, battery devices and electrical equipment. Background Technology

[0002] A battery pack consists of a housing and individual battery cells inside. If a battery cell short-circuits or experiences thermal runaway, it will generate a large amount of gas, causing the internal pressure of the housing to rise rapidly. If the gas cannot be vented and depressurized in time, it may lead to a violent fire or explosion. Therefore, the housing is generally equipped with an explosion-proof valve. When the internal pressure reaches a threshold, the explosion-proof valve opens to release the internal pressure of the housing.

[0003] Traditional explosion-proof valves gradually close as the internal pressure of the enclosure decreases, failing to continuously release the gas inside. This incomplete venting of gas poses a risk of re-ignition and explosion. Utility Model Content

[0004] In view of the above problems, this application provides an explosion-proof valve that, after being opened to a certain extent, will remain in a normally open state and continuously release the gas inside the chamber.

[0005] In a first aspect, this application provides an explosion-proof valve, comprising:

[0006] The valve body has a first through hole that penetrates the valve body.

[0007] A valve core assembly is disposed on a valve body. The valve core assembly includes a valve cover, which is located at a first position covering a first through hole and can move away from the first position under the action of an external force to open the first through hole.

[0008] The limiting element is configured such that after the valve cover moves away from the first position, the limiting element is clamped between the valve cover and the valve body and can prevent the valve cover from returning to the first position.

[0009] The explosion-proof valve provided in this embodiment has a valve cover that seals the first through hole in the valve core assembly. When subjected to external force, the valve cover moves and opens the first through hole. At this time, the limiting member will prevent the valve cover from resetting to cover the first through hole, thereby keeping the first through hole in a normally open state.

[0010] In some embodiments, the limiting element is constructed as an elastic element that deforms when the valve cover moves away from the first position.

[0011] The explosion-proof valve provided in this application embodiment constructs the limiting member as an elastic member. When the valve cover moves to the position where the first through hole is opened, the elastic member deforms and is locked onto the valve cover or valve body, thereby preventing the valve cover from resetting to the first position.

[0012] In some embodiments, when the valve cover is in the first position, the first end of the limiting member is fixed to one of the valve cover or the valve body, and the second end of the limiting member abuts against the other of the valve cover or the valve body.

[0013] The explosion-proof valve provided in this application embodiment fixes one end of the limiting member to one of the valve cover or the valve body, so that the limiting member is always connected to the valve cover or the valve body, preventing the limiting member from falling off.

[0014] In some embodiments, a mating part is provided on the valve cover or valve body, which is used to abut against the deformed elastic element when the valve cover is away from the first position.

[0015] The explosion-proof valve provided in this application embodiment limits the elastic element that opens the first through hole by providing a mating part on the valve core assembly or valve body.

[0016] In some embodiments, the valve cover is movably disposed in the middle of the valve body, and an installation gap is provided between the peripheral side surface of the valve cover and the inner wall surface of the valve body, with the elastic element disposed within the installation gap.

[0017] The explosion-proof valve provided in this application embodiment facilitates the installation and limiting of the elastic element by setting the elastic element in the installation gap between the peripheral side of the valve cover and the inner wall of the valve body. At the same time, the elastic element can also play a limiting role by being driven to open in time by the movement of the valve cover.

[0018] In some embodiments, one end of the elastic element abuts against the outer peripheral surface of the valve cover, and the other end abuts against the inner wall surface of the valve body.

[0019] The explosion-proof valve provided in this application embodiment, through the above-mentioned configuration, enables the elastic element to store a certain deformation. When the elastic element loses its abutting force, it releases the stored deformation and springs open to perform a limiting function.

[0020] In some embodiments, the elastic element extends in a plane perpendicular to the valve cover's direction of movement.

[0021] The explosion-proof valve provided in this application embodiment has an elastic element that extends circumferentially along the valve cover, which facilitates the rapid response and opening of the elastic element when the valve cover is moved into place. At the same time, the axial dimension of the elastic element is small, which helps to save installation space for the elastic element.

[0022] In some embodiments, the width of the elastic element in the valve cover movement direction is not greater than the preset movement range of the valve cover.

[0023] The explosion-proof valve provided in this application embodiment, when the valve core assembly is in the first position covering the first through hole, the elastic element completely avoids the mating part on the valve cover or valve body; when the valve cover moves to open the first through hole, the elastic element will be able to abut against the mating part to achieve the purpose of limiting the position.

[0024] In some embodiments, one end of the elastic element is connected to the outer peripheral surface of the valve cover, and the end face of the valve body in the moving direction of the valve cover opening the first through hole is configured as a mating part. When the elastic element moves with the valve cover to avoid the valve body, it springs open and abuts against the end face of the valve body.

[0025] The explosion-proof valve provided in this application embodiment connects one end of an elastic element to the outer peripheral surface of the valve cover. When the valve core assembly moves under the pressure of the gas chamber, the elastic element moves synchronously with the valve cover. When the other end of the elastic element avoids the inner wall surface of the valve body, the other end of the elastic element loses its obstruction and deforms outwards from the valve body, thereby abutting against the end face of the valve body. At this time, the valve cover can continue to move in the direction of opening the first through hole. However, due to the obstruction of the valve body end face by the elastic element, the valve cover cannot move back to the direction of covering the first through hole.

[0026] In some embodiments, one end of the elastic element is connected to the inner wall surface of the valve body, and the mating part is constructed as a groove on the outer peripheral surface of the valve cover. The groove is located on the side of the elastic element away from the first through hole. When the valve cover moves to the second position in the direction of opening the first through hole, the elastic element is engaged in the groove.

[0027] The explosion-proof valve provided in this application embodiment connects one end of the elastic element to the inner wall of the valve body. When the valve core assembly is pushed by the air pressure in the box to move, the elastic element will not move synchronously with the valve cover. During the movement of the valve core assembly, when the other end of the elastic element is aligned with the slot, it will spring open and be stuck in the slot, blocking the valve cover from continuing to move, so that the valve cover will not be able to move and reset in the direction of covering the first through hole.

[0028] In some embodiments, multiple limiting members are provided at intervals along the outer peripheral surface of the valve cover.

[0029] The explosion-proof valve provided in this application embodiment uses multiple limiting components to limit the valve cover, thereby improving the reliability of the limiting.

[0030] Secondly, this application provides a battery device, comprising:

[0031] The enclosure and the explosion-proof valve in any of the above embodiments are provided. A battery cell is installed inside the enclosure, and the explosion-proof valve is installed on the wall of the enclosure. When the internal pressure of the enclosure reaches a threshold, the valve cover opens the first through hole.

[0032] By employing the explosion-proof valve in any of the above embodiments, when the battery device experiences thermal runaway, the gas inside the box can be continuously discharged to the outside of the box through the first through hole until the gas inside the box is completely discharged, preventing the gas inside the box from reigniting and improving the reliability of the explosion-proof function of the battery device.

[0033] Thirdly, this application provides an electrical device, including the battery device as described in the above embodiment, the battery device being used to provide electrical energy.

[0034] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0036] Figure 1 This is a schematic diagram of the structure of an electrical device according to some embodiments of this application;

[0037] Figure 2 This is a schematic diagram of the structure of a battery device according to some embodiments of this application;

[0038] Figure 3 This is an exploded view of the structure of an explosion-proof valve according to some embodiments of this application.

[0039] Figure 4 This is an exploded structural diagram of the explosion-proof valve of some embodiments of this application from another perspective;

[0040] Figure 5 This is a schematic diagram of the explosion-proof valve in some embodiments of this application in the state where the limiting member is not popped open;

[0041] Figure 6 This is a schematic diagram of the explosion-proof valve in the pop-out state of some embodiments of this application.

[0042] The reference numerals in the detailed embodiments are as follows:

[0043] 1000, vehicles;

[0044] 100. Battery assembly; 10. Housing; 11. First part; 12. Second part; 20. Individual battery cell; 200. Controller; 300. Motor;

[0045] 30. Explosion-proof valve; 31. Valve body; 311. Valve body body; 312. Connecting rib; 313. Guide block; 314. Sealing ring; 315. Sheath; 316. Connecting ear; 32. Valve core assembly; 321. Valve cover; 3211. Sealing cover; 3212. Connecting plate; 322. Guide rod; 323. Spring; 33. Limiting element; 331. Inclined surface. Detailed Implementation

[0046] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0048] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0051] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0052] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0053] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0054] From a market perspective, the application of batteries is becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application areas of batteries continue to expand, the market demand is also constantly increasing.

[0055] Battery packs typically consist of a housing and individual battery cells within it. To ensure safe and stable operation, the housing needs to be waterproof and dustproof, theoretically requiring a sealed environment. However, even in a sealed state, if a battery cell short-circuits or experiences thermal runaway, it will generate a large amount of gas, causing a rapid increase in internal pressure. If the gas cannot be vented and depressurized in time, it may lead to a violent fire or explosion, resulting in significant personal injury and property damage. Therefore, the housing is generally equipped with a corresponding number of explosion-proof valves to meet the waterproof, explosion-proof, and depressurization requirements of the battery pack.

[0056] The inventors of this application noted that in most explosion-proof valves, a spring connects the valve core assembly and the valve body. The elastic force of the spring controls the sealing of the connection between the valve core assembly and the valve body, determining whether the explosion-proof valve can open smoothly. Specifically: when the internal gas pressure is less than the spring force, the valve core assembly remains stationary, sealing the first through-hole on the valve body. As the internal gas pressure increases, the force exerted by the gas on the valve core assembly gradually increases. When this force exceeds the spring force, the valve core assembly begins to move, opening the first through-hole on the valve body. However, the opening of the explosion-proof valve is limited by the internal gas pressure. As the first through-hole opens, gas is continuously discharged from the chamber, causing the internal pressure to drop. When the pressure drops to a certain value, the spring force can no longer support the valve core assembly to continue opening the first through-hole, and the first through-hole on the valve body will close. Incomplete gas discharge from the chamber poses a risk of re-explosion.

[0057] The inventors of this application discovered through research that, based on the structure of a traditional explosion-proof valve, a limiting component is installed between the valve body and the valve core assembly. The opening of the valve core assembly is still controlled by a spring. When the gas pressure inside the chamber is less than the spring force, the valve core assembly seals the first through-hole on the valve body. When the gas pressure inside the chamber rises to a threshold value, the valve core assembly opens the first through-hole on the valve body. At this time, the limiting component functions, preventing the valve core assembly from moving towards covering the first through-hole, thus limiting the valve core assembly to the position where the first through-hole is open, keeping the first through-hole in a normally open state, thereby allowing the gas inside the chamber to continuously discharge to the outside of the chamber through the first through-hole.

[0058] Based on this design concept, the inventors of this application have designed an explosion-proof valve, including a valve body, a valve core assembly, and a limiting member. The valve body is disposed on the wall of a housing, and has a first through hole penetrating the valve body. The valve core assembly is disposed on the valve body and includes a valve cover. The valve cover is located at a first position covering the first through hole and can be moved away from the first position under external force, thus opening the first through hole. The limiting member is configured such that after the valve cover moves away from the first position, the limiting member is clamped between the valve cover and the valve body, and can prevent the valve cover from returning to the first position.

[0059] The explosion-proof valve is used in battery devices. When the battery device is operating normally, the valve cover seals the first through-hole. When the battery device experiences thermal runaway and the internal pressure of the casing increases to a threshold, the valve cover moves relative to the valve body, opening the first through-hole. At this time, a limiting component prevents the valve core assembly from resetting to cover the first through-hole, keeping the first through-hole normally open. This allows gas inside the casing to continuously escape through the first through-hole. The explosion-proof valve provided in this application can completely release gas from the casing when the battery device experiences thermal runaway, improving the reliability of the explosion-proof function.

[0060] It should be noted that the embodiments of this application do not limit the specific type of explosion-proof valve. For example, the explosion-proof valve can be a diaphragm explosion-proof valve, a safety valve, or a temperature-controlled explosion-proof valve. The type of explosion-proof valve does not limit the function of the explosion-proof valve in the embodiments of this application.

[0061] This application provides a battery device including the aforementioned explosion-proof valve. The battery device can be used, but is not limited to, in energy storage devices or electrical appliances. Energy storage devices include energy storage containers, energy storage cabinets, etc. Electrical appliances can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0062] In some embodiments, the electrical equipment may be a vehicle. The vehicle may be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle; a new energy vehicle may be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device is installed inside the vehicle, and the battery device may be located at the bottom, front, or rear of the vehicle. The battery device can be used to power the vehicle; for example, the battery device can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor, and the controller can be used to control the battery device to power the motor. For example, the battery device can be used to meet the vehicle's power needs during starting, navigation, and driving.

[0063] The explosion-proof valve, battery device, and electrical equipment provided in the embodiments of this application are described below with reference to the accompanying drawings.

[0064] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. Taking the vehicle 1000 as an example, the vehicle 1000 can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 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 device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0065] In some embodiments, the battery device 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.

[0066] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a battery device 100 provided in some embodiments of this application. In some embodiments, the battery device 100 includes a housing 10 and a battery cell 20, wherein the battery cell 20 is housed within the housing 10.

[0067] The housing 10 provides a space for housing individual battery cells, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, and together define a space for housing individual battery cells. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, with the first portion 11 covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 together define the space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0068] Please refer to Figure 2 In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 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 housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0069] Combination Figure 3 and Figure 4 , Figure 3 An exploded view of the explosion-proof valve 30 provided in some embodiments of this application; Figure 4 This is an exploded structural diagram of the explosion-proof valve 30 of some embodiments of this application from another perspective.

[0070] This application provides an explosion-proof valve 30, which is disposed on the wall of a housing 10. Specifically, the explosion-proof valve 30 includes a valve body 31, a valve core assembly 32, and a limiting member 33. The valve body 31 has a first through hole. The valve core assembly 32 is disposed on the valve body 31 and includes a valve cover 321. The valve cover 321 is located at a first position covering the first through hole and can be moved away from the first position under the action of external force to open the first through hole. The limiting member 33 is configured to be clamped between the valve cover 321 and the valve body 31 after the valve cover 321 is moved away from the first position, and can prevent the valve cover 321 from returning to the first position.

[0071] The explosion-proof valve 30 provided in this application embodiment has the valve cover 321 sealing the first through hole when the battery device 100 is operating normally. When the battery device 100 experiences thermal runaway and the internal pressure of the housing 10 increases to a threshold, the valve core assembly 32 moves relative to the valve body 31 to open the first through hole. At this time, the limiting member 33 will prevent the valve core assembly 32 from resetting to cover the first through hole, keeping the first through hole in a normally open state. This allows the gas inside the housing 10 to continuously be discharged to the outside of the housing 10 through the first through hole until the gas inside the housing 10 is completely discharged, preventing the gas inside the housing 10 from reigniting and improving the reliability of the explosion-proof function of the battery device 100.

[0072] To facilitate the installation of the explosion-proof valve 30 on the housing 10, the valve body 31 includes a valve body 311 and a connecting ear 316. At least two connecting ears 316 are provided around the valve body 311. The connecting ears 316 are provided with connecting holes so that the connecting ears 316 can be fixed to the housing 10 by passing bolts, screws or other fasteners through the connecting holes.

[0073] For example, combined Figure 3 and Figure 4 As shown, the valve body 311 has a hollow section in the middle, and a guide block 313 is provided in the hollow section. The guide block 313 has a mounting hole, and the valve core assembly 32 is slidably disposed in the mounting hole. The valve body 31 also includes a connecting rib 312, which connects the valve body 311 and the guide block 313 to fix the guide block 313.

[0074] Optionally, a sealing groove is provided on the inner wall of the valve body 311, and a sealing ring 314 is provided in the sealing groove. When the valve core assembly 32 is in the state of blocking the first through hole, the valve core assembly 32 abuts against the sealing ring 314. By providing the sealing ring 314, the sealing performance between the sealing assembly 32 and the valve body 311 is improved.

[0075] To facilitate the installation of the valve core assembly 32, the valve body 31 also includes a sleeve 315, which is disposed on the outer surface of the valve body 311. The sleeve 315 and the guide block 313 are arranged along the sliding direction of the valve core assembly 32. The valve core assembly 32 is movably disposed on the sleeve 315 and the guide block 313, and the sleeve 315 provides support and protection for the valve core assembly 32.

[0076] In some embodiments, such as Figure 3 and Figure 4 As shown, the valve core assembly 32 also includes a guide rod 322 and a spring 323. The guide rod 322 is movably disposed between the sleeve 315 and the guide block 313. One end of the guide rod 322 protrudes from the side of the guide block 313 away from the sleeve 315 and connects to the valve cover 321. The valve cover 321 can move with the guide rod 322 to seal against or disengage from the sealing ring 314. The spring 323 is sleeved on one end of the guide rod 322 located within the sleeve 315. A limiting platform is provided at the end of the guide rod 322 away from the valve cover 321. The two ends of the spring 323 abut against the guide block 313 and the limiting platform, respectively. The spring 323 can be a compression spring, applying an elastic force to the guide rod 322, causing the guide rod 322 to move the valve cover 321 towards the valve body 311 and abut against the sealing ring 314.

[0077] Please continue reading. Figure 3 and Figure 4 To facilitate the installation of the limiting member 33, the valve cover 321 is designed accordingly. Specifically, the valve cover 321 includes a sealing cover 3211 and a connecting plate 3212 connected together. The sealing cover 3211 is connected to the guide rod 322 and is used to abut against the sealing ring 314 to block the first through hole. The connecting plate 3212 is vertically disposed on the side of the sealing cover 3211 facing the guide rod 322. The limiting member 33 is disposed between the connecting plate 3212 and the valve body 311. The limiting member 33 can be disposed on the connecting plate 3212 or the valve body 311. Optionally, the connecting plate 3212 is disposed circumferentially along the sealing cover 3211, forming a gap with the inner wall of the valve body 311 to provide installation space for the limiting member 33.

[0078] It should be noted that the valve body 31 and valve core assembly 32 provided in this application embodiment are not limited to the above-mentioned structural forms. Other structural forms of explosion-proof valves can also adopt the limiting member 33 proposed in this application embodiment to achieve the purpose of keeping the first through hole in a normally open state and continuously releasing the gas in the box 10 after it is opened.

[0079] In some embodiments, please refer to Figure 5 and Figure 6The limiting member 33 is constructed as an elastic member, which deforms when the valve cover 321 moves away from the first position. By constructing the limiting member 33 as an elastic member, when the valve cover 321 moves to the position where the first through hole is opened, the elastic member deforms and is locked onto the valve cover 321 or the valve body 31, thereby preventing the valve cover 321 from returning to the first position.

[0080] Specifically, the elastic element is sandwiched between the connecting plate 3212 and the valve body 311. When the valve cover 321 moves to the second position where the first through hole is open, the elastic element deforms to lock onto the valve cover 321 or the valve body 31. When the valve cover 321 is in the first position, the connecting plate 3212 and the valve body 311 provide a limit to the limiting element 33, which does not function as a limit and does not obstruct the movement of the valve core assembly 32. When the valve cover 321 moves to the second position, one of the connecting plate 3212 or the valve body 311 is misaligned with the limiting element 33. The limiting element 33 loses its limiting function on one side and deforms to lock onto the valve cover 321 or the valve body 31, thereby preventing the valve cover 321 from resetting to cover the first through hole.

[0081] Optionally, when the valve cover 321 is in the first position, the first end of the limiting member 33 is fixed to one of the valve cover 321 or the valve body 31, and the second end of the limiting member 33 abuts against the other of the valve cover 321 or the valve body 31. By fixing one end of the limiting member 33 to one of the valve cover 321 or the valve body 31, the limiting member 33 is always kept connected to the valve cover 321 or the valve body 31, preventing the limiting member 33 from falling off.

[0082] In some embodiments, a mating part is provided on the valve cover 321 or the valve body 31. When the valve cover 321 is away from the first position, the mating part is used to abut against the deformed elastic element to limit the elastic element (i.e., the limiting element 33).

[0083] Specifically, the valve cover 321 is movably disposed in the middle of the valve body 31, and an installation gap is provided between the peripheral side of the valve cover 321 and the inner wall of the valve body 31, with the elastic element disposed within the installation gap. That is, the guide rod 322 of the valve core assembly 32 is movably disposed on the guide block 313, and an installation gap is formed between the connecting plate 3212 of the valve core assembly 32 and the inner wall of the valve body 311, with the elastic element disposed within the installation gap. By disposing of the elastic element within the installation gap between the peripheral side of the valve cover 321 and the inner wall of the valve body 31, the installation and limiting of the elastic element are facilitated, and the movement of the valve cover 321 can drive the elastic element to spring open in a timely manner to perform a limiting function.

[0084] Optionally, one end of the elastic element abuts against the outer peripheral surface of the valve cover 321, and the other end abuts against the inner wall surface of the valve body 31. In this way, the elastic element can store a certain amount of deformation, and when the heated end of the elastic element loses its abutting force, it releases the stored deformation and springs open to perform a limiting function.

[0085] Specifically, one end of the elastic element is connected to the outer peripheral surface of the valve cover 321. The end face of the valve body 31 in the direction of movement of the valve cover 321 opening the first through hole is configured as a mating part. When the elastic element moves with the valve cover 321 to avoid the valve body 31, it springs open and abuts against the end face of the valve body 31. Specifically, one end of the elastic element is connected to the side of the connecting plate 3212 facing the valve body 311. When the elastic element springs open, it abuts against the end face of the valve body 311 facing the sealing cover 3211.

[0086] By connecting one end of the elastic element to the outer peripheral surface of the valve cover 321, when the valve core assembly 32 is moved by the air pressure inside the housing 10, the elastic element will move synchronously with the valve cover 321. When the other end of the elastic element avoids the inner wall surface of the valve body 31, the other end of the elastic element loses its obstruction and will deform outward from the valve body 31, thereby abutting against the end face of the valve body 31. At this time, the valve core assembly 32 can continue to move in the direction of opening the first through hole. However, due to the obstruction of the end face of the valve body 31 by the elastic element, the valve core assembly 32 will not be able to move back to the direction of covering the first through hole.

[0087] In another embodiment, one end of the elastic element is connected to the inner wall surface of the valve body 31, and the mating part is constructed as a groove (not shown in the figure) on the outer peripheral surface of the valve cover 321. The groove is provided on the side of the elastic element opposite to the first through hole. When the valve cover 321 moves to the second position in the direction of opening the first through hole, the elastic element is engaged in the groove. Specifically, one end of the elastic element is connected to the inner wall surface of the valve body 311, and the other end of the elastic element movably abuts against the connecting plate 3212. The groove is provided on the outer peripheral surface of the connecting plate 3212 at the end opposite to the sealing cover 3211.

[0088] By connecting one end of the elastic element to the inner wall of the valve body 31, when the valve core assembly 32 is pushed by the air pressure inside the housing 10 to move, the elastic element will not move synchronously with the valve cover 321. During the movement of the valve core assembly 32, when the other end of the elastic element is aligned with the slot, it will spring open and be inserted into the slot, preventing the valve core assembly 32 from continuing to move, so that the valve cover 321 will not be able to move and reset in the direction of covering the first through hole.

[0089] In some embodiments, the elastic element is a spring sheet. The spring sheet is bent circumferentially along the valve core assembly 32 and disposed within the mounting gap formed by the connecting plate 3212 and the inner wall surface of the valve body 311.

[0090] Optionally, such as Figure 5 As shown, the free end of the limiting member 33, that is, the end not connected to the connecting plate 3212, is provided with a bevel 331. By providing the bevel 331, the end of the limiting member 33 can smoothly abut against the valve body 311, thereby preventing the limiting member 33 from scratching the valve body 311 during the opening process.

[0091] In some embodiments, the elastic element extends in a plane perpendicular to the moving direction of the valve cover 321, allowing it to extend circumferentially along the valve cover 321. This facilitates a rapid response and opening of the elastic element when the valve cover 321 is in place. Simultaneously, the smaller axial dimension of the elastic element on the valve cover 321 helps save installation space.

[0092] In some embodiments, the width of the elastic element in the moving direction of the valve cover 321 is not greater than the preset moving range of the valve cover 321. Thus, when the valve cover 321 is in the first position covering the first through hole, the elastic element completely avoids the mating part on the valve cover 321 or the valve body 31; when the valve cover 321 moves to the second position opening the first through hole, the elastic element will be able to abut against the mating part to achieve the limiting purpose.

[0093] In some embodiments, multiple limiting members 33 are provided at intervals along the outer peripheral surface of the valve cover 321, so that the valve cover 321 is limited by multiple limiting members 33 together, thereby improving the reliability of the limiting.

[0094] The explosion-proof valve 30 provided in this embodiment includes a valve body 31, a valve core assembly 32, and a limiting member 33. The valve body 31 has a first through hole. The valve core assembly 32 includes a valve cover 321, a guide rod 322, and a spring 323. The guide rod 322 is movably disposed on the valve body 31. The valve cover 321 is located at a first position covering the first through hole and can move away from the first position under external force, thus opening the first through hole. The limiting member 33 is an elastic member, clamped between the valve cover 321 and the valve body 31. When the valve cover 321 moves to a second position where the first through hole is open, the elastic member springs open and locks onto the valve cover 321 or the valve body 31, preventing the valve cover 321 from returning to the first position, thereby keeping the first through hole in a normally open state. When applied to the battery device 100, the gas inside the housing 10 can be continuously discharged to the outside of the housing 10 through the first through hole until the gas inside the housing 10 is completely discharged, preventing the gas inside the housing 10 from reigniting and improving the reliability of the explosion-proof function of the battery device 100.

[0095] This application also provides a battery device 100, including a housing 10 and an explosion-proof valve 30 as described in any of the above embodiments. A battery cell 20 is disposed inside the housing 10. The explosion-proof valve 30 is disposed on the wall of the housing 10. When the internal pressure of the housing 10 reaches a threshold, the valve cover opens a first through-hole. When the battery device 100 experiences thermal runaway, the gas inside the housing 10 can be continuously discharged to the outside of the housing 10 through the first through-hole until the gas inside the housing 10 is completely discharged, preventing the gas inside the housing 10 from reigniting and improving the reliability of the explosion-proof function of the battery device 100.

[0096] It should be noted that the explosion-proof valve 30 proposed in this application is not limited to the battery device 100, but is also applicable to other devices that require venting or drainage.

[0097] This application also provides an electrical device, including a battery device 100 as described in any of the above embodiments, the battery device 100 being used to provide electrical energy.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An explosion relief valve, characterized in that The valve body is provided with a first through hole; The valve core assembly is arranged on the valve body, and the valve core assembly comprises a valve cover, the valve cover is located at a first position covering the first through hole, and the valve cover can move away from the first position under the action of an external force and open the first through hole; The limiting piece is configured to be clamped between the valve cover and the valve body after the valve cover moves away from the first position, and the limiting piece can prevent the valve cover from returning to the first position. The limiting piece is configured as an elastic piece, 2. The explosion relief valve of claim 1, wherein The elastic piece deforms when the valve cover moves away from the first position. When the valve cover is located at the first position, a first end of the limiting piece is fixed to one of the valve cover or the valve body, and a second end of the limiting piece abuts the other of the valve cover or the valve body.

3. The explosion relief valve of claim 1, wherein, The valve cover or the valve body is provided with a matching part, and the matching part is in abutting cooperation with the elastic piece when the valve cover moves away from the first position.

4. The explosion relief valve of claim 2, wherein, The valve cover is movably arranged at the middle part of the valve body, an installation gap is arranged between the peripheral side surface of the valve cover and the inner wall surface of the valve body, and the elastic piece is arranged in the installation gap.

5. The explosion relief valve of claim 4, wherein, One end of the elastic piece abuts the outer peripheral surface of the valve cover, and the other end abuts the inner wall surface of the valve body.

6. The explosion relief valve of claim 5, wherein, The elastic piece is arranged in extension in a plane perpendicular to the moving direction of the valve cover.

7. The explosion relief valve of claim 6, wherein, The width of the elastic piece in the moving direction of the valve cover is not greater than the preset moving range of the valve cover.

8. The explosion relief valve of claim 7, wherein, One end of the elastic piece is connected to the outer peripheral surface of the valve cover, and the end surface of the valve body in the moving direction of the valve cover to open the first through hole is configured as the matching part, and the elastic piece is pushed away when the valve cover moves away from the valve body and abuts the end surface of the valve body.

9. Explosion relief valve according to any of claims 4-8, characterized in that One end of the elastic piece is connected to the inner wall surface of the valve body, the matching part is configured as a clamping groove on the outer peripheral surface of the valve cover, the clamping groove is arranged on the side of the elastic piece away from the first through hole, and when the valve cover moves to a second position in the direction to open the first through hole, the elastic piece is clamped into the clamping groove.

10. Explosion relief valve according to any of claims 4-8, characterized in that The limiting piece is arranged in multiple along the outer peripheral surface of the valve cover.

11. Explosion relief valve according to any of claims 1-8, characterized in that The box body is provided with a battery monomer, the explosion-proof valve is arranged on the box wall of the box body, and when the internal pressure of the box body reaches a threshold value, the valve cover opens the first through hole.

12. A battery device characterized by comprising: The battery device as claimed in claim 12 is used to provide electric energy. ​ 13. An electrical device, characterized by ​

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