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 comprises a connecting piece and a valve deck. The valve cover is located at a first position covering the first through hole and can be far away from the first position under the action of external force and open the first through hole; the connecting piece is arranged on the valve body and connected with the valve deck, the connecting piece is in a first state when the valve deck covers the first through hole, and the connecting piece is driven by the valve deck to be in a second state when the valve deck is away from the first position. The limiting piece is configured to prevent the connecting piece from being restored to the first state from the second state after the valve cover is away from 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, a battery device and an electrical device. After the explosion-proof valve is opened to a certain extent, it will remain in a normally open state and continuously release the gas inside the box.

[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 includes a connector and a valve cover; the valve cover is located at a first position covering a first through hole, and can move away from the first position under external force, thus opening the first through hole; the connector is disposed on the valve body and connected to the valve cover; when the valve cover covers the first through hole, the connector is in a first state; when the valve cover moves away from the first position, the connector is in a second state driven by the valve cover; and

[0008] The limiting element is configured to prevent the connector from returning to the first state from the second state after the valve cover has moved away from the first position.

[0009] The explosion-proof valve provided in this application embodiment covers a first through hole on the valve body with a valve cover. Under normal operating conditions, the valve cover is located in a first position covering the first through hole. When subjected to external force, the valve cover moves away from the first position, opening the first through hole. A connector connects the valve cover and the valve body. By setting a limiting member, the connector is prevented from returning to the first state from the second state, so that the valve cover connected to the connector is limited to the first position where the first through hole is open, thereby keeping the first through hole in a normally open state.

[0010] In some embodiments, the valve core assembly further includes:

[0011] A protective element is connected to the valve body, with the connecting element at least partially located inside the protective element. After the valve cover moves away from the first position, a limiting element is located between the protective element and the connecting element, preventing the connecting element from returning to the first state.

[0012] The explosion-proof valve provided in this application embodiment has a protective component, which allows at least a portion of the connecting component to be located inside the protective component, facilitating the installation of the limiting component and providing protection for both the connecting component and the limiting component.

[0013] In some embodiments, the connector has a first end connected to the valve cover and a second end away from the valve cover, a protective element is sleeved on the second end, and a limiting element is located between the second end and the protective element.

[0014] The explosion-proof valve provided in this application embodiment has a protective component fitted onto the second end of the connector that is away from the valve cover. The position of the connector is limited by the limiting component at the second end. At the same time, since it is far away from the valve cover, it will not interfere with or affect the opening and closing of the valve cover.

[0015] In some embodiments, the limiting member is constructed as an elastic member that deforms when the valve cover moves away from the first position to lock onto the connector or protective member.

[0016] The explosion-proof valve provided in this application embodiment uses an elastic limiting member. When the valve cover is located in the first position covering the first through hole, the connecting member and the protective member limit the limiting member, preventing deformation and thus maintaining its limiting function without obstructing the movement of the connecting member. When the valve cover moves away from the first position, the elastic member deforms and engages with the connecting member or the protective member, preventing the connecting member from moving back and limiting the valve cover from resetting to cover the first through hole.

[0017] In some embodiments, when the valve cover is in the first position, one end of the limiting member is fixed to one of the connecting member or the protective member, and the other end of the limiting member abuts against the other of the connecting member or the protective member.

[0018] The explosion-proof valve provided in this application prevents the limiting member from falling off by fixing one end of the limiting member to one of the connecting member or the protective member. The other end of the limiting member abuts against the other of the connecting member or the protective member, remaining in a free state so that it deforms when released from the clamping of the connecting member and the protective member, thereby locking onto the connecting member or the protective member.

[0019] In some embodiments, the protective element or valve body is provided with a mating part, which abuts against the deformed elastic element after the valve cover moves away from the first position.

[0020] The explosion-proof valve provided in this application embodiment limits the elastic element by providing a mating part on the protective component or valve body, which abuts against the deformed elastic element.

[0021] In some embodiments, one end of the elastic member is connected to the outer peripheral surface of the second end of the connector, and the mating part is constructed as a boss on the inner wall surface of the protective member. When the connector moves to the second state, the other end of the elastic member deforms to be locked onto the boss.

[0022] The explosion-proof valve provided in this application embodiment connects one end of an elastic element to the outer peripheral surface of the second end of a connector. When the valve core assembly moves under the pressure of the gas chamber, the elastic element moves synchronously with the connector. When the other end of the elastic element avoids the side surface of the boss, the other end of the elastic element loses its obstruction and deforms outwards from the connector, thereby abutting against the upper surface of the boss. At this time, the valve core assembly can continue to move in the direction of opening the first through hole. However, due to the obstruction of the elastic element by the boss, the valve core assembly cannot move back to the direction of covering the first through hole.

[0023] In some embodiments, before the connector moves to the second state, the other end of the elastic member abuts against the side of the boss facing the outer peripheral surface of the connector.

[0024] The explosion-proof valve provided in this application embodiment uses a boss to abut and limit the other end of the elastic member. As the elastic member moves upward with the connecting member, the lower end of the elastic member avoids the boss and springs away towards the inner wall of the protective member, abutting against the upper surface of the boss.

[0025] In some embodiments, one end of the elastic element is connected to the inner wall surface of the protective element, and the other end extends toward the valve body; the mating part is constructed as the end face of the second end of the connector, and when the connector moves to the second state, the other end of the elastic element is locked onto the end face of the second end of the connector.

[0026] The explosion-proof valve provided in this application embodiment connects one end of the elastic element to the inner wall of the protective element. When the valve core assembly is pushed by the air pressure inside the box to move, the elastic element will not move synchronously with the connecting element. During the movement of the valve core assembly, the other end of the elastic element gradually separates from the connecting element. When it pops open, it will be stuck on the end face of the connecting element, blocking the connecting element from moving back, so that the valve cover cannot move and reset in the direction of covering the first through hole.

[0027] In some embodiments, an installation gap is provided between the outer peripheral surface of the connector and the inner wall surface of the protective member, and the limiting member is disposed within the installation gap.

[0028] The explosion-proof valve provided in this application embodiment facilitates the installation and limiting of the limiting member by setting the limiting member in the installation gap between the outer peripheral surface of the connector and the inner wall surface of the protective member. At the same time, the limiting member can also play a limiting role by being driven to open in time by the movement of the valve core assembly.

[0029] In some embodiments, the limiting member extends along the moving direction of the connector.

[0030] The explosion-proof valve provided in this application embodiment has a limiting member that extends along the moving direction of the connecting member, which facilitates the limiting member to quickly respond and spring open when the valve core assembly moves into place.

[0031] In some embodiments, multiple limiting members are provided at intervals along the outer peripheral surface of the connector.

[0032] The explosion-proof valve provided in this application embodiment provides a limiting effect on the connecting parts through multiple limiting components, thereby improving the limiting reliability.

[0033] Secondly, this application provides a battery device, including a housing, a battery cell disposed within the housing, and an explosion-proof valve as described in any of the above embodiments. The explosion-proof valve is disposed on the housing wall, and a first through hole connects the interior and exterior of the housing.

[0034] The battery device provided in this application embodiment, by employing the aforementioned explosion-proof valve, has its valve cover sealing the first through hole during normal operation. When the battery device experiences thermal runaway and the internal pressure of the housing increases to a threshold, the valve cover opens the first through hole. At this time, the limiting member prevents the connecting member from resetting, causing the valve cover to move away from the position where it covers the first through hole, thereby keeping the first through hole in a normally open state. This allows the gas inside the housing to continuously exit through the first through hole until the gas inside the housing is completely discharged, preventing the gas inside the housing from reigniting and improving the reliability of the battery device's explosion-proof function.

[0035] 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.

[0036] 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

[0037] 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:

[0038] Figure 1 This is a schematic diagram of the structure of an electrical device according to some embodiments of this application;

[0039] Figure 2 This is a schematic diagram of the structure of a battery device according to some embodiments of this application;

[0040] Figure 3This is an exploded view of the structure of an explosion-proof valve according to some embodiments of this application.

[0041] Figure 4 This is an exploded structural diagram of the explosion-proof valve of some embodiments of this application from another perspective;

[0042] Figure 5 This is a schematic diagram of the explosion-proof valve in the first state according to some embodiments of this application;

[0043] Figure 6 This is a schematic diagram of the explosion-proof valve in the second state according to some embodiments of this application.

[0044] The reference numerals in the detailed embodiments are as follows:

[0045] 1000, vehicles;

[0046] 100. Battery assembly; 10. Housing; 11. First part; 12. Second part; 20. Individual battery cell; 200. Controller; 300. Motor;

[0047] 30. Explosion-proof valve; 31. Valve body; 311. Valve body body; 312. Connecting rib; 313. Guide block; 314. Sealing ring; 315. Connecting lug; 32. Valve core assembly; 321. Valve cover; 322. Connecting piece; 3221. Limiting protrusion; 323. Spring; 33. Protective component; 331. Boss; 34. Limiting component. Detailed Implementation

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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).

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] The inventors of this application noted that in most explosion-proof valves, a spring connects the valve cover and the valve body. The elastic force of the spring controls the sealing of the connection between the valve cover and the valve body, and determines whether the explosion-proof valve can be opened smoothly. Specifically: when the gas pressure inside the enclosure is less than the spring force, the valve cover does not move, sealing the first through hole on the valve body; as the gas pressure inside the enclosure increases, the force exerted by the gas on the valve cover gradually increases. When this force exceeds the elastic force of the spring, the valve cover begins to move, opening the first through hole on the valve body. However, the opening of the explosion-proof valve is limited by the gas pressure inside the enclosure. As the first through hole opens, the gas inside the enclosure is continuously discharged, and the gas pressure inside the enclosure decreases accordingly. When the pressure drops to a certain value, the elastic force of the spring can no longer support the valve cover to continue opening the first through hole, and the first through hole on the valve body will close. Incomplete gas discharge from the enclosure poses a risk of re-ignition and explosion.

[0059] 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 cover and the valve body. The opening of the valve cover is still controlled by a spring. When the gas pressure inside the chamber is less than the spring force, the valve cover seals the first through hole on the valve body. When the gas pressure inside the chamber rises to a threshold value, the valve cover opens the first through hole on the valve body. At this time, the limiting component functions, preventing the valve core assembly from moving towards the direction of 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.

[0060] 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 a through-hole is provided on the valve body, connecting the interior and exterior of the housing. The valve core assembly includes a connector and 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, opening the first through-hole; the connector is disposed on the valve body and connected to the valve cover. When the valve cover covers the first through-hole, the connector is in a first state; when the valve cover moves away from the first position, the connector is in a second state driven by the valve cover. The limiting member prevents the connector from returning to the first state from the second state after the valve cover moves away from the first position, thereby preventing the valve cover from returning to cover the first through-hole, thus keeping the explosion-proof valve in a normally open state.

[0061] 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 increases to a threshold, the valve cover opens the first through-hole due to the pressure inside the casing. At this time, a limiting component prevents the valve cover from returning to its original position and closing 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] The structure of the explosion-proof valve, battery device, and electrical equipment provided in the embodiments of this application will be described below with reference to the accompanying drawings.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 of some embodiments of this application from another perspective.

[0072] Please see Figure 3 and Figure 4 This application provides an explosion-proof valve 30, which includes a valve body 31, a valve core assembly 32, and a limiting member 34. The valve body 31 has a first through hole. The valve core assembly 32 includes a connector 322 and 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 external force, thus opening the first through hole. The connector 322 is disposed on the valve body 31 and connected to the valve cover 321. When the valve cover 321 covers the first through hole, the connector 322 is in a first state. When the valve cover 321 moves away from the first position, the connector 322 is in a second state under the action of the valve cover 321. The limiting member 34 is configured to prevent the connector 322 from returning to the first state after the valve cover 321 moves away from the first position.

[0073] The explosion-proof valve 30 provided in this embodiment covers the first through hole on the valve body 31 with a valve cover 321. Under normal operating conditions, the valve cover 321 is located in the first position covering the first through hole. When subjected to external force, the valve cover 321 moves away from the first position and opens the first through hole. The connector 322 connects the valve cover 321 and the valve body 31. By providing a limiting member 34, the connector 322 is prevented from returning to the first state from the second state, so that the valve cover 321 connected to the connector 322 is limited to the first position with the first through hole open, thereby keeping the first through hole in a normally open state.

[0074] Specifically, the connector 322 is slidably mounted on the valve body 31. When the valve cover 321 is subjected to force and moves relative to the valve body 31, the connector 322 slides along the valve body 31 as the valve cover 321 moves.

[0075] In some embodiments, the valve core assembly 32 further includes a protective member 33 connected to the valve body 31. A connecting member 322 is at least partially located within the protective member 33. After the valve cover 321 moves away from the first position, a limiting member is located between the protective member 33 and the connecting member 322, preventing the connecting member 322 from returning to the first state. Specifically, the protective member 33 is configured as a sleeve with one open end. The open end of the sleeve is connected to the side of the valve body 31 opposite to the valve cover 321, and the sleeve covers the connecting member 322.

[0076] The explosion-proof valve 30 provided in this application embodiment has a protective member 33, which allows at least a portion of the connector 322 to be located inside the protective member 33, facilitating the installation of the limiting member 34 and providing protection for both the connector 322 and the limiting member 34.

[0077] In some embodiments, the connector 322 has a first end connected to the valve cover 321 and a second end away from the valve cover 321, the protective member 33 is sleeved on the second end, and the limiting member 34 is located between the second end and the protective member 33.

[0078] The explosion-proof valve provided in this application embodiment has a protective member 33 sleeved on the second end of the connector 322 away from the valve cover 321. The position of the connector 322 is limited by the limiting member 34 limiting the second end. At the same time, since it is far away from the valve cover 321, it will not interfere with or have other effects on the opening and closing of the valve cover 321.

[0079] Specifically, the valve body 31 includes a valve body 311 and a connecting ear 315. At least two connecting ears 315 are provided around the valve body 311. The connecting ears 315 are provided with connecting holes so that fasteners such as bolts and screws can pass through the connecting holes to fix the connecting ears 315 to the housing 10.

[0080] 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 disposed within the hollow section. The guide block 313 has a mounting hole, and the valve core assembly 32 is slidably disposed within the mounting hole. The valve body 31 also includes connecting ribs 312, which connect the valve body 311 and the guide block 313 to fix the guide block 313. Multiple connecting ribs 312 are spaced apart, and the gaps between adjacent connecting ribs 312 connect the interior and exterior of the valve body 31.

[0081] 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 valve core assembly 32 and the valve body 311 is improved.

[0082] In one embodiment, such as Figure 4 As shown, the protective element 33 is disposed on the outer surface of the valve body 311 away from the sealing ring 314, and the protective element 33 and the guide block 313 are arranged along the sliding direction of the valve core assembly 32. Specifically, the protective element 33 is configured as a sleeve structure with a through hole at its bottom, allowing gas inside the housing 10 to enter the protective element 33 through the through hole, thereby applying a thrust to the valve core assembly 32. The valve core assembly 32 is movably disposed between the protective element 33 and the guide block 313, with the protective element 33 providing support and protection for the valve core assembly 32.

[0083] In some embodiments, such as Figure 4 As shown, the valve core assembly 32 includes a valve cover 321, a connector 322, and a spring 323. The connector 322 is movably disposed between the protective member 33 and the guide block 313. One end of the connector 322 protrudes from the side of the guide block 313 away from the protective member 33 and connects to the valve cover 321. The valve cover 321 can move with the connector 322 to seal against or disengage from the sealing ring 314. The spring 323 is sleeved on the end of the connector 322 located within the protective member 33. A limiting protrusion 3221 is provided at the end of the connector 322 away from the valve cover 321. The two ends of the spring 323 abut against the guide block 313 and the limiting protrusion 3221, respectively. The spring 323 can be a compression spring, applying an elastic force to the connector 322, causing the connector 322 to move the valve cover 321 towards the valve body 311 and abut against the sealing ring 314.

[0084] In one embodiment, the limiting member 34 is constructed as an elastic member. This elastic member deforms when the valve cover 321 moves away from the first position to engage with the connecting member 322 or the protective member 33. By constructing the limiting member 34 as an elastic member, when the valve cover 321 is located in the first position covering the first through hole, the connecting member 322 and the protective member 33 provide a limiting effect on the limiting member 34, preventing deformation and thus not obstructing the movement of the connecting member 322. When the valve cover 321 moves away from the first position, the elastic member deforms and engages with the connecting member 322 or the protective member 33, thereby preventing the connecting member 322 from moving back and limiting the valve cover 321 from resetting to cover the first through hole.

[0085] In some embodiments, when the valve cover 321 is in the first position, one end of the limiting member 34 is fixed to one of the connecting member 322 or the protective member 33, and the other end of the limiting member 34 abuts against the other of the connecting member 322 or the protective member 33.

[0086] By fixing one end of the limiting member 34 to one of the connecting member 322 or the protective member 33, the limiting member 34 is prevented from falling off. The other end of the limiting member 34 abuts against the other of the connecting member 322 or the protective member 33, remaining in a free state so that it can deform when released from the clamping of the connecting member 322 and the protective member 33, and thus be locked onto the connecting member 322 or the protective member 33.

[0087] Optionally, the protective member 33 or the valve body 31 is provided with a mating part, which abuts against the deformed elastic member after the valve cover 321 moves away from the first position, so as to limit the elastic member (i.e., the limiting member 34).

[0088] Specifically, the valve core assembly 32 is movably disposed in the middle of the valve body 31. An installation gap is provided between the outer peripheral surface of the connector 322 and the inner wall surface of the protective member 33, and the limiting member 34 is disposed within this installation gap. That is, the connector 322 of the valve core assembly 32 is movably disposed on the guide block 313, and an installation gap is formed between the limiting protrusion 3221 and the inner wall surface of the protective member 33, with the limiting member 34 disposed within this gap. By disposing of the limiting member 34 within the installation gap between the outer peripheral surface of the connector 322 and the inner wall surface of the protective member 33, the installation and limiting of the limiting member 34 are facilitated. Furthermore, the movement of the valve core assembly 32 can drive the limiting member 34 to spring open in a timely manner, thus fulfilling its limiting function.

[0089] Optionally, such as Figure 5As shown, one end of the limiting member 34 abuts against the outer peripheral surface of the connecting member 322, and the other end abuts against the inner wall surface of the protective member 33. By having the outer peripheral surface of the connecting member 322 and the inner wall surface of the protective member 33 respectively abut against both ends of the limiting member 34, the limiting member 34 can store a certain amount of deformation. When one end of the limiting member 34 loses its abutting force, it releases the stored deformation and springs open, thus performing the limiting function.

[0090] In one embodiment, the limiting member 34 extends along the moving direction of the connecting member 322, which facilitates the limiting member 34 to quickly spring open when the valve core assembly 32 moves into place.

[0091] Optionally, multiple limiting members 34 are provided at intervals along the outer peripheral surface of the connector 322, so that the connector 322 can be limited by multiple limiting members 34 together, thereby improving the limiting reliability.

[0092] In one embodiment, combined with Figure 5 and Figure 6 As shown, one end of the elastic member is connected to the outer peripheral surface of the connector 322, and the mating part is a boss 331 on the inner wall surface of the protective member 33. When the connector 322 moves to the second state, the other end of the elastic member deforms to be locked onto the boss 331.

[0093] By connecting one end of the elastic element to the outer peripheral surface of the connector 322, when the valve core assembly 32 is moved by the air pressure inside the housing 10, the elastic element will move synchronously with the connector 322. When the other end of the elastic element avoids the side surface of the boss 331, the other end of the elastic element loses its obstruction and will deform outward from the connector 322, thereby abutting against the upper surface of the boss 331. 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 elastic element by the boss 331, the valve core assembly 32 will not be able to move back to the direction of covering the first through hole.

[0094] Optionally, such as Figure 5 As shown, before the connector 322 moves to the second state, the other end of the elastic member abuts against the side of the boss 331 facing the outer peripheral surface of the connector 322. The boss 331 provides abutment and restraint to the other end of the elastic member. Figure 6 As shown, during the upward movement of the elastic member along with the connecting member 322, the lower end of the elastic member avoids the boss 331 and springs away towards the inner wall of the protective member 33, abutting against the upper surface of the boss 331.

[0095] Specifically, the boss 331 is disposed at the bottom of the inner wall surface of the protective member 33, and the lower end of the limiting member 34 abuts against the side of the boss 331. It can be understood that a gap can also be maintained between the boss 331 and the bottom of the protective member 33. When the valve core assembly 32 is in the position of sealing the valve body 31, the lower end of the limiting member 34 abuts against the inner wall surface of the protective member 33 on the lower side of the boss 331. As the valve core assembly 32 moves upward, the lower end of the limiting member 34 gradually abuts against the side of the boss 331 and finally abuts against the upper surface of the boss 331.

[0096] Optionally, one end of the elastic element can be fixedly connected to the end face of the second end of the connector 322. When the valve cover 321 is in the first position covering the first through hole, the other end of the elastic element abuts against the upper surface of the boss 331. When the connector 322 moves to the second state, the other end of the elastic element avoids the upper surface of the boss 331 and loses its obstruction, deforming and opening towards the bottom surface of the protective member 33 and abutting against the bottom surface of the protective member 33, thereby preventing the connector 322 from resetting to the second state, and thus positioning the valve cover 321 in the position where the first through hole is opened.

[0097] In another embodiment, one end of the elastic member is connected to the inner wall surface of the protective member 33, and the other end extends toward the valve body 31; the mating part is constructed as the end face of the second end of the connector 322, and when the connector 322 moves to the second state, the other end of the elastic member is engaged with the end face of the second end of the connector 322. Specifically, one end of the elastic member is connected to the side of the boss 331 facing the outer peripheral surface of the connector 322, and the other end of the elastic member movably abuts against the outer peripheral surface of the connector 322.

[0098] By connecting one end of the elastic element to the inner wall of the protective element 33, when the valve core assembly 32 is pushed by the air pressure inside the housing 10, the elastic element will not move synchronously with the connecting element 322. During the movement of the valve core assembly 32, the other end of the elastic element gradually separates from the connecting element 322. When it pops open, it will be stuck on the end face of the valve core assembly 32, blocking the connecting element 322 from moving back, so that the valve cover 321 cannot move and reset in the direction of covering the first through hole.

[0099] In some embodiments, the elastic element is a spring sheet. Spring sheets have a simple structure and a good range of deformation.

[0100] The explosion-proof valve 30 provided in this embodiment includes a valve body 31, a valve core assembly 32, a protective member 33, and a limiting member 34. The valve body 31 has a first through hole. The valve core assembly 32 includes a valve cover 321, a connector 322, and a spring 323. The connector 322 is slidably disposed on the valve body 31, and the valve cover 321 is connected to the connector 322 and covers the first through hole under the action of the spring 323. A limiting member 34 is provided between the connector 322 and the protective member 33. After the valve cover 321 opens the first through hole, the limiting member 34 can prevent the valve cover 321 from resetting to cover the first through hole by limiting the connector 322, so that the first through hole remains in a normally open state.

[0101] This application also provides a battery device 100, including a housing 10, a battery cell 20 disposed in the housing 10, and an explosion-proof valve 30 as described in any of the above embodiments. The explosion-proof valve 30 is disposed on the housing wall of the housing 10, and a first through hole connects the interior and exterior of the housing 10.

[0102] By employing the aforementioned explosion-proof valve 30, the valve cover 321 seals the first through hole during normal operation of the battery device 100. When the battery device 100 experiences thermal runaway and the internal pressure of the housing 10 increases to a threshold, the valve cover 321 opens the first through hole. At this time, the limiting member 34 prevents the connecting member 322 from resetting, causing the valve cover 321 to move away from the position where it covers the first through hole, thereby keeping the first through hole in a normally open state. This allows the gas inside the housing 10 to continuously exit 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.

[0103] 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.

[0104] 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.

[0105] 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 includes a connecting piece and a valve cover; the valve cover is located at a first position covering the first through hole and can be driven away from the first position by external force to open the first through hole; the connecting piece is arranged on the valve body and connected to the valve cover, and the connecting piece is in a first state when the valve cover covers the first through hole, and the connecting piece is in a second state when the valve cover is driven away from the first position; And The limiting piece is configured to prevent the connecting piece from returning to the first state from the second state after the valve cover is driven away from the first position. The valve core assembly further includes:

2. The explosion relief valve of claim 1, wherein The protective piece is connected to the valve body, and the connecting piece is at least partially located in the protective piece; after the valve cover is driven away from the first position, the limiting piece is located between the protective piece and the connecting piece to prevent the connecting piece from returning to the first state. The connecting piece has a first end connected to the valve cover and a second end away from the valve cover; the protective piece is sleeved on the second end, and the limiting piece is located between the second end and the protective piece.

3. The explosion relief valve of claim 2, wherein, The limiting piece is configured as an elastic piece which is deformed when the valve cover is driven away from the first position to be clamped on the connecting piece or the protective piece.

4. The explosion relief valve of claim 3, wherein When the valve cover is located at the first position, one end of the limiting piece is fixed to one of the connecting piece or the protective piece, and the other end of the limiting piece abuts against the other of the connecting piece or the protective piece.

5. The explosion relief valve of claim 4, wherein, The protective piece or the valve body is provided with a matching part which abuts against the deformed elastic piece after the valve cover is driven away from the first position.

6. The explosion relief valve of claim 4, wherein, One end of the elastic piece is connected to the outer peripheral surface of the second end of the connecting piece, and the matching part is configured as a boss on the inner wall surface of the protective piece; when the connecting piece moves to the second state, the other end of the elastic piece is deformed to be clamped on the boss.

7. The explosion relief valve of claim 6, wherein, Before the connecting piece moves to the second state, the other end of the elastic piece abuts against the side surface of the boss facing the outer peripheral surface of the connecting piece.

8. The explosion relief valve of claim 7, wherein, One end of the elastic piece is connected to the inner wall surface of the protective piece, and the other end of the elastic piece extends towards the valve body; the matching part is configured as the end surface of the second end of the connecting piece; when the connecting piece moves to the second state, the other end of the elastic piece is clamped on the end surface of the second end of the connecting piece.

9. The explosion relief valve of claim 6, wherein, An installation gap is provided between the outer peripheral surface of the connecting piece and the inner wall surface of the protective piece, and the limiting piece is arranged in the installation gap.

10. Explosion relief valve according to any of claims 2-9, characterized in that The limiting piece extends along the moving direction of the connecting piece.

11. The explosion relief valve of claim 10, wherein, The limiting piece is spaced apart from the outer peripheral surface of the connecting piece.

12. Explosion relief valve according to any of claims 1-9, characterized in that The battery device includes a box body, a battery cell arranged in the box body, and the explosion-proof valve according to any one of claims 1-12, the explosion-proof valve being arranged on the box wall of the box body, and the first through hole communicating the inside and outside of the box body.

13. A battery device characterized by comprising: The battery device according to claim 13 is used for providing electric energy.

14. An electrical device, characterized by ​

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