Explosion-proof valve, battery box, battery and electric device

Abstract

The embodiment of the utility model provides an anti-explosion valve, a battery box, a battery and an electric device, the anti-explosion valve is provided with a first side and a second side which are opposite along a first direction, and the anti-explosion valve comprises a valve body and a switch assembly with a ventilation channel. The first side of the valve body is provided with a mounting groove and a mounting channel. The switch assembly comprises a switch piece, a piston and an ejector rod. And the piston is arranged in the mounting groove. The ejector rod is provided with a connecting channel, and a connecting port and an exhaust hole located in the first side and the second side of the connecting channel. The connecting channel forms a part of the ventilation channel. The end, provided with the connecting port, of the ejector rod is connected with the piston and arranged in the mounting channel in a sliding mode. And the switch piece is arranged in the connecting channel through the connecting port. And the switch piece is used for generating elastic deformation under the action of air pressure so as to move from a closing position for closing the connecting channel to an opening position for opening the connecting channel. And the switch piece is also used for resetting from the opening position to the closing position under the action of self elasticity. The production efficiency can be improved, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an explosion-proof valve, a battery box, a battery and an electrical device. Background Art

[0002] This section is intended to provide a background or context for the embodiments of the present application. No description herein is admitted to be prior art by virtue of its inclusion in this section.

[0003] In order to solve the problem of high-temperature and high-pressure gas emission generated by battery cells in the case of overcharging, failure, etc., explosion-proof valves are often installed on battery boxes to quickly release pressure when the battery is out of control to ensure the safety of the battery system. At present, the explosion-proof valve needs to be provided with a bottom plug to fix the moisture-proof structure in the top rod, and the top rod needs to be post-processed to fix the fixing structure of the bottom plug, which leads to the problem of many processing steps for the top rod and complex processing technology. In addition, due to the increase in parts, the manufacturing cost is high. Utility Model Content

[0004] In view of this, the embodiments of the present application hope to provide an explosion-proof valve, a battery box, a battery and an electrical device that can simplify the processing steps of the push rod, reduce the difficulty of the push rod processing, and reduce the number of parts, thereby improving production efficiency and reducing manufacturing costs.

[0005] To achieve the above-mentioned object, a first aspect of an embodiment of the present application provides an explosion-proof valve having a first side and a second side opposite to each other along a first direction, the explosion-proof valve comprising:

[0006] A valve body, wherein a first side of the valve body is provided with a mounting groove and a mounting channel penetrating the valve body along a first direction, and the mounting channel is communicated with the mounting groove;

[0007] A switch assembly with a vent channel, the switch assembly comprising a switch member, a piston and a push rod, at least a portion of the piston is disposed in the mounting groove, the push rod is provided with a connecting channel and a connecting port and an exhaust hole located on a first side and a second side of the connecting channel, the connecting channel constitutes a part of the vent channel, one end of the push rod provided with the connecting port is connected to the piston, and is slidably disposed in the mounting channel;

[0008] In which, the switch component can be arranged in the connecting channel through the connecting port, and the switch component is used to undergo elastic deformation under the action of air pressure to move from a closed position closing the connecting channel to an open position opening the connecting channel, and the switch component is also used to reset from the open position to the closed position under the action of its own elastic force.

[0009] The explosion-proof valve provided in the embodiment of the present application includes a valve body and a switch assembly. The switch assembly is provided with a vent channel, and the top rod is provided with a connecting channel, and the connecting channel constitutes a part of the vent channel. If the switch component of the switch assembly has a pressure difference between the air pressures on both sides thereof, the switch component moves from a closed position that closes the connecting channel to an open position that opens the connecting channel, and the airflow on the high-pressure side automatically flows to the low-pressure side, so that the battery exhausts air to the outside or the outside world takes air into the battery. By providing a connecting port on the first side of the connecting channel of the top rod, the switch component can be provided in the connecting channel through the connecting port, so that the bottom plug can be selected not to be provided for fixing the switch component in the top rod, thereby, the top rod does not need to be provided with a fixing structure for fixing the bottom plug, which simplifies the structure of the top rod, thereby simplifying the processing steps and processing difficulty of the top rod, and can reduce parts, thereby improving production efficiency and reducing manufacturing costs.

[0010] In some embodiments, the second side of the connecting channel has a first positioning surface surrounding the exhaust hole, the second side of the piston has a second positioning surface, and the push rod and the piston clamp the opposite ends of the switch element between the first positioning surface and the second positioning surface.

[0011] In this embodiment, only the push rod and the piston part are needed to clamp the switch part, and no screws or other fasteners are needed for fastening. When the push rod is unscrewed, the switch part can be directly pulled out from the connection port of the connection channel. When assembly is required, the switch part is placed into the connection channel from the connection port, and then the push rod is tightened. Disassembly and assembly are relatively convenient, and it is easy to adjust the elastic force between the switch part, the push rod and the piston.

[0012] In some embodiments, the switch member includes a switch valve, a first elastic member and a second elastic member, wherein two ends of the first elastic member respectively abut against the second positioning surface and the first side of the switch valve, and two ends of the second elastic member respectively abut against the first positioning surface and the second side of the switch valve.

[0013] By arranging the first elastic member and the second elastic member, so that the two ends of the first elastic member are respectively abutted against the second positioning surface and the first side of the switch valve, and the two ends of the second elastic member are respectively abutted against the first positioning surface and the second side of the switch valve, the first elastic member and / or the second elastic member undergo elastic deformation to make the switch valve slide along the first direction in the installation channel, thereby realizing the switch valve moving from a closed position closing the connecting channel to an open position opening the connecting channel, and resetting from the open position to the closed position under the elastic force of the first elastic member and / or the second elastic member.

[0014] In some embodiments, the switch valve includes a first sub-valve and a second sub-valve, the first sub-valve includes a connecting rod and a sealing portion extending radially outward from the connecting rod, and an inner side wall of the connecting channel is formed with a step surface facing the first side;

[0015] The two ends of the second elastic member are respectively in contact with the first positioning surface and the second sub-valve, and the second sub-valve is pressed against the step surface; the two ends of the first elastic member are respectively in contact with the sealing portion and the second positioning surface, and the sealing portion is pressed against the second sub-valve, and the connecting rod is passed through the through hole of the second sub-valve and is gap-matched with the through hole.

[0016] When the switch component has a pressure difference on both sides of the air pressure, for example, when the air pressure inside the battery is greater than the external air pressure, the air flow inside the battery pushes open the second sub-valve so that there is a gap between the second sub-valve and the step surface, and compresses the second elastic component. The air flow inside the battery enters the connecting channel from the exhaust port, flows through the gap between the sealing portion and the inner wall of the connecting channel, then flows through the gap between the second sub-valve and the step surface, and is finally discharged to the outside. When the switch component has no pressure difference on both sides of the air pressure or the pressure difference is small, the second elastic component restores its elastic deformation, and the second sub-valve again abuts against and seals against the step surface under the elastic force of the second elastic component. The switch component closes the connecting channel to close the air permeable channel. When the air pressure inside the battery is lower than the air pressure outside, the airflow outside pushes open the sealing part, so that there is a gap between the sealing part and the second sub-valve, and compresses the first elastic member, and the airflow outside enters the connecting channel from the cavity of the piston, and flows through the gap between the connecting rod and the through hole, and then flows through the gap between the sealing part and the second sub-valve, and finally enters the battery through the air inlet and outlet. When the switch component has no pressure difference or a small pressure difference on both sides of the switch component, the first elastic member restores its elastic deformation, and the sealing part abuts against and seals with the second sub-valve again under the elastic force of the first elastic member, and the switch component closes the connecting channel to close the air permeable channel. In this way, the first elastic member and the second elastic member are elastically deformed under the action of air pressure, so that the first sub-valve and the second sub-valve move from the closed position of closing the connecting channel to the open position of opening the connecting channel, and the first sub-valve and the second sub-valve are also used to reset from the open position to the closed position under the elastic force of the first elastic member and the second elastic member.

[0017] In some embodiments, the circumferential side wall of the sealing portion is spaced apart from the inner side wall of the connecting channel; and / or the circumferential side wall of the second sub-valve is spaced apart from the inner side wall of the connecting channel.

[0018] By arranging the circumferential side wall of the sealing portion and the inner side wall of the connecting channel at intervals, air flow can flow through the gap between the circumferential side wall of the sealing portion and the inner side wall of the connecting channel, thereby achieving ventilation.

[0019] By spacing the circumferential side wall of the second sub-valve and the inner side wall of the connecting channel, air flow can flow through the gap between the circumferential side wall of the second sub-valve and the inner side wall of the connecting channel, thereby achieving ventilation.

[0020] In some embodiments, the valve body is provided with an air outlet passage penetrating the valve body along a first direction, and the air outlet passage is communicated with the mounting groove;

[0021] The switch assembly is used to undergo elastic deformation under the action of external force to move from a closed position closing the air outlet channel to an open position opening the air outlet channel. The switch assembly is also used to reset from the open position to the closed position under the action of its own elastic force.

[0022] By setting the switch assembly to be able to selectively open or close the gas outlet channel, if the air pressure in the battery is too high, the air pressure will push the switch assembly to move toward the second side and elastically deform to move from the closed position of closing the gas outlet channel to the open position of opening the gas outlet channel. This enables the rapid discharge of gas inside the power battery pack. When the external air pressure and the air pressure in the battery reach equilibrium, the switch assembly is also used to reset from the open position to the closed position under the action of its own elastic force.

[0023] In some embodiments, the switch assembly further comprises a third elastic member, the circumferential side wall of the push rod extends radially outward to form a step, and two ends of the third elastic member abut against the step and the second side of the valve body respectively;

[0024] The piston and the push rod move toward the first side of the explosion-proof valve under the action of external force, so that the third elastic member generates elastic deformation and is reset under the action of the elastic force of the third elastic member.

[0025] By setting a third elastic member, and making the two ends of the third elastic member abut against the step and the second side of the valve body respectively, the piston can be sealed with the groove wall of the installation groove by the elastic force of the third elastic member. If the air pressure in the battery is too high, the air pressure overcomes the elastic force of the third elastic member, pushes the switch assembly toward the second side, and continues to compress the third elastic member. When the external air pressure and the air pressure in the battery reach a balance, the external force acting on the piston is cancelled, and the piston and the push rod are reset to the closed position under the elastic force of the third elastic member.

[0026] In some embodiments, the explosion-proof valve further includes a first sealing member, which is sealingly disposed between the valve body and the piston and is located on the radially outer side of the gas outlet passage along the valve body.

[0027] By setting the first sealing member, when the explosion-proof valve is set on the box body, the first sealing member is sealed between the valve body and the piston to seal the installation gap between the valve body and the piston, thereby improving the sealing performance of the explosion-proof valve.

[0028] In some embodiments, the explosion-proof valve further includes a second sealing member disposed on a second side of the valve body.

[0029] By providing a second sealing member, when the explosion-proof valve is provided on the box body, the second sealing member is clamped between the box body and the valve body to seal the installation gap between the box body and the valve body, thereby improving the sealing performance of the battery box.

[0030] In some embodiments, the push rod is an integrated structure.

[0031] By setting the ejector rod as an integrated structure, the ejector rod is integrally formed with a connecting channel, a connecting port and an exhaust hole, that is, the switch component can be assembled and fixed to the connecting channel only by the cooperation between the ejector rod and the piston. The structure of the explosion-proof valve and its ejector rod is simplified, thereby simplifying the processing steps and processing difficulty of the ejector rod, and reducing parts, thereby improving production efficiency and reducing manufacturing costs.

[0032] A second aspect of the embodiments of the present application provides a battery box, comprising a box body and the explosion-proof valve in any embodiment of the present application, wherein an installation space is provided in the box body, the explosion-proof valve is arranged on the box body, and the air permeable channel is connected to the installation space.

[0033] The battery box of the embodiment of the present application includes a box body and the explosion-proof valve of any embodiment of the present application. The explosion-proof valve is provided with a connecting port on the first side of the connecting channel of the top rod, and the switch component can be arranged in the connecting channel through the connecting port, so that it is optional to not provide a bottom plug for fixing the switch component in the top rod. Therefore, the top rod does not need to be provided with a fixing structure for fixing the bottom plug, which simplifies the structure of the top rod, and further simplifies the processing steps and difficulty of the top rod, and can reduce parts, thereby improving production efficiency and reducing manufacturing costs.

[0034] A third aspect of the embodiments of the present application provides a battery, comprising at least one battery cell and the battery box in any embodiment of the present application, wherein the battery cell is arranged in the installation space.

[0035] The battery includes at least one battery cell and a battery box in any embodiment of the present application. The explosion-proof valve of the battery box is provided with a connecting port on the first side of the connecting channel of the top rod, and the switch component can be arranged in the connecting channel through the connecting port, so that it is optional to not provide a bottom plug for fixing the switch component in the top rod. Therefore, the top rod does not need to be provided with a fixing structure for fixing the bottom plug, which simplifies the structure of the top rod, and further simplifies the processing steps and difficulty of the top rod, and can reduce parts, thereby improving production efficiency and reducing manufacturing costs.

[0036] A fourth aspect of the embodiments of the present application provides an electrical device, comprising the battery in any embodiment of the present application, wherein the battery is used to provide electrical energy to the electrical device.

[0037] The electrical device provided in the embodiment of the present application includes an explosion-proof valve, which includes a valve body and a switch assembly. The switch assembly is provided with a venting channel, and the top rod is provided with a connecting channel, which constitutes a part of the venting channel. If the switch component of the switch assembly has a pressure difference between the air pressures on both sides thereof, the switch component moves from a closed position that closes the connecting channel to an open position that opens the connecting channel, and the airflow on the high-pressure side automatically flows to the low-pressure side, so that the battery exhausts to the outside or the outside world takes in air to the battery. By providing a connecting port on the first side of the connecting channel of the top rod, the switch component can be provided in the connecting channel through the connecting port, so that the bottom plug can be selected not to be provided for fixing the switch component in the top rod, thereby, the top rod does not need to be provided with a fixing structure for fixing the bottom plug, which simplifies the structure of the top rod, thereby simplifying the processing steps and processing difficulty of the top rod, and can reduce parts, thereby improving production efficiency and reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present application;

[0039] Figure 2 A three-dimensional exploded schematic diagram of a battery provided in one embodiment of the present application;

[0040] Figure 3 A schematic structural diagram of an explosion-proof valve from a first perspective provided in an embodiment of the present application;

[0041] Figure 4 A schematic structural diagram of an explosion-proof valve from a second perspective provided in an embodiment of the present application;

[0042] Figure 5 A schematic structural diagram of an explosion-proof valve provided in an embodiment of the present application from a third perspective;

[0043] Figure 6 for Figure 5 Section view in AA direction;

[0044] Figure 7 for Figure 6 A cross-sectional view of the connection structure between the middle switch member and the top rod;

[0045] Figure 8 An exploded view of an explosion-proof valve provided in one embodiment of the present application.

[0046] Description of Reference Numerals

[0047] 1. Valve body; 1a. Air outlet channel; 1b. Accommodating groove; 1c. Mounting channel; 1d. Connecting seat; 2. Switch assembly; 21. End cover; 22. Piston; 22a. Cavity; 22b. Mounting column; 22c. Second positioning surface; 23. Push rod; 23a. Connecting channel; 23b. Step; 23c. Step surface; 23d. Connecting port; 23e. Exhaust hole; 23n. First positioning surface; 24. Switch member; 241. Second sub-valve; 241a. Through hole; 242, first sub-valve; 242a, connecting rod; 242b, sealing part; 243, first elastic member; 244, second elastic member; 25, third elastic member; 3, ferromagnetic member; 3a, air outlet; 5, first sealing member; 6, second sealing member; 7, waterproof breathable membrane; 10, explosion-proof valve; 10a, air passage; 20, battery box; 21, box body; 22, battery cell; 100, battery; 200, controller; 300, motor; 1000, vehicle. DETAILED DESCRIPTION

[0048] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0051] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0053] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "circumferential", "height direction", "first direction", and "second direction" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0055] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0056] With the development of clean energy, more and more devices use electric energy as driving energy, and then power batteries that can store more electric energy and can be charged and discharged repeatedly are developing rapidly, such as lithium-ion batteries. Among them, power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields.

[0057] Lithium-ion power batteries have the properties of high operating voltage, high specific energy, small size, light weight, long cycle life, low self-discharge rate, no memory effect, and no pollution, so they are used by many power equipment manufacturers. With the vigorous development of lithium batteries, battery safety issues have also received widespread attention. When there are defects in individual batteries of the lithium battery system or defects in the battery system design, individual batteries will be out of control, resulting in a sharp increase in the internal pressure of the battery. In order to solve the problem of high-temperature and high-pressure gas emissions generated by the battery under overcharge, failure, etc., explosion-proof valves are often installed on the battery box to quickly release pressure when the battery is out of control to ensure the safety of the battery system.

[0058] In the related art, a mounting opening is provided at the end of the push rod away from the piston, and the moisture-proof structure is arranged in the push rod through the mounting opening. Therefore, the explosion-proof valve needs to be provided with a bottom plug for fixing the moisture-proof structure in the push rod, and the push rod needs to be post-processed with a fixing structure for fixing the bottom plug, which leads to the problem of many processing steps for the push rod and complicated processing technology. In addition, due to the increase in parts, the manufacturing cost is relatively high.

[0059] In order to improve production efficiency and reduce manufacturing costs, an embodiment of the present application provides an explosion-proof valve, which is applied to a battery box. The explosion-proof valve has a first side and a second side opposite to each other along a first direction. The explosion-proof valve includes a valve body and a switch assembly with a vent channel. The first side of the valve body is provided with a mounting groove and a mounting channel that penetrates the valve body along the first direction, and the mounting channel is connected to the mounting groove. The switch assembly includes a switch member, a piston and a push rod. At least part of the piston is arranged in the mounting groove. The push rod is provided with a connecting channel and a connecting port and an exhaust hole located on the first side and the second side of the connecting channel. The connecting channel constitutes a part of the vent channel. One end of the push rod provided with a connecting port is connected to the piston and is slidably arranged in the mounting channel. The switch member can be arranged in the connecting channel through the connecting port. The switch member is used to undergo elastic deformation under the action of air pressure to move from a closed position that closes the connecting channel to an open position that opens the connecting channel. The switch member is also used to reset from an open position to a closed position under the action of its own elastic force.

[0060] The switch assembly is provided with a vent channel, and the top rod is provided with a connecting channel, which constitutes a part of the vent channel. If the switch component of the switch assembly has a pressure difference between the air pressures on both sides thereof, the switch component moves from a closed position that closes the connecting channel to an open position that opens the connecting channel, and the airflow on the high-pressure side automatically flows to the low-pressure side, thereby achieving exhaust of the battery to the outside world or intake of air from the outside world to the battery. By providing a connecting port on the first side of the connecting channel of the top rod, the switch component can be provided in the connecting channel through the connecting port, so that the bottom plug can be selected not to be provided for fixing the switch component in the top rod. Therefore, the top rod does not need to be provided with a fixing structure for fixing the bottom plug, which simplifies the structure of the top rod, thereby simplifying the processing steps and difficulty of the top rod, and can reduce parts, thereby improving production efficiency and reducing manufacturing costs.

[0061] The technical solutions described in the embodiments of the present application are applicable to battery boxes, batteries, and electrical devices using batteries.

[0062] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0063] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0064] It should be noted that the technical solutions described in the embodiments of the present application are not limited to the batteries and electrical devices described above, but can also be applied to all batteries including a box and electrical devices using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0065] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. A controller 200, a motor 300 and a battery 100 may be provided inside the vehicle 1000, and the controller 200 is used to control the battery 100 to power the motor 300. For example, a battery 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery 100 may not only be used as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0066] In order to meet different power requirements, the battery 100 may include a plurality of battery cells 22, which refers to the smallest unit constituting the battery 100 module or the battery 100 pack. The plurality of battery cells 22 may be connected in series, in parallel or in hybrid connection, and the hybrid connection means that the plurality of battery cells 22 are both connected in series and in parallel. The plurality of battery cells 22 may be directly connected in series, in parallel or in hybrid connection, and then the whole formed by the plurality of battery cells 22 is accommodated in the box 21; of course, the battery 100 may also be a plurality of battery cells 22 connected in series, in parallel or in hybrid connection to form a battery 100 module, and then the plurality of battery 100 modules are connected in series, in parallel or in hybrid connection to form a whole, and are accommodated in the box 21. The battery 100 may also include other structures, for example, the battery 100 may also include a confluence component for realizing electrical connection between the plurality of battery cells 22. Among them, each battery cell 22 may be a secondary battery 100 or a primary battery 100; it may also be a lithium-sulfur battery 100, a sodium-ion battery 100 or a magnesium-ion battery 100, but is not limited thereto. The battery cell 22 may be cylindrical, flat, rectangular or in other shapes.

[0067] Figure 2 An exploded schematic diagram of a battery 100 provided in one embodiment of the present application.

[0068] like Figure 2 As shown, the battery 100 includes at least one battery cell 22 (not shown) and a battery box 20 of any embodiment of the present application, and the battery cell 22 is disposed in the installation space of the battery box 20 .

[0069] The battery box 20 can be a simple three-dimensional structure such as a single cuboid, cylinder or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres. The material of the battery box 20 can be alloy materials such as aluminum alloy, iron alloy, etc., or polymer materials such as polycarbonate, polyisocyanurate foam plastics, or composite materials such as glass fiber and epoxy resin.

[0070] The battery box 20 includes a box body 21 and an explosion-proof valve 10 of any embodiment of the present application. An installation space is provided in the box body 21. The explosion-proof valve 10 is arranged on the box body 21, and the air permeable passage is connected to the installation space.

[0071] The battery box 20 is used to accommodate the battery cells 22, and the battery box 20 can be of various structures. In some embodiments, the battery box 20 may include a first box body and a second box body, the first box body and the second box body cover each other, and the first box body and the second box body jointly define an installation space for accommodating the battery cells 22. The second box body may be a hollow structure with one end open, the first box body is a plate-like structure, and the first box body covers the open side of the second box body to form a battery box 20 with an installation space; the first box body and the second box body may also be hollow structures with one side open, and the open side of the first box body covers the open side of the second box body to form a battery box 20 with an installation space. Of course, the first box body and the second box body may be of various shapes, such as a cylinder, a cuboid, etc.

[0072] In order to improve the sealing performance after the first box body portion is connected to the second box body portion, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body portion and the second box body portion.

[0073] Assuming that the first box body part covers the top of the second box body part, the first box body part can also be called an upper box cover, and the second box body part can also be called a lower box cover.

[0074] In the battery 100, there can be one or more battery cells 22. If there are more than one battery cell 22, the battery cells 22 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 22 are connected in series and in parallel. The battery cells 22 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the battery cells 22 is accommodated in the battery box 20; of course, the battery cells 22 can also be connected in series, in parallel, or in a mixed connection to form a battery 100 module, and then the battery 100 modules are connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the battery box 20.

[0075] Exemplarily, the battery cell 22 may include a lithium-ion battery cell 22, a sodium-ion battery cell 22, or a magnesium-ion battery cell 22, etc., which is not limited in the embodiments of the present application. The battery cell 22 may be cylindrical, flat, rectangular, or in other shapes, etc., which is not limited in the embodiments of the present application. The battery cell 22 is generally divided into three types according to the packaging method: cylindrical battery cells 22, square battery cells 22, and soft-pack battery cells 22, which is not limited in the embodiments of the present application. However, for the sake of simplicity, the following embodiments are all described using square battery cells 22 as an example.

[0076] The present application embodiment provides an explosion-proof valve 10, which is applied to a battery box 20. Figures 3 to 8 The explosion-proof valve 10 has a first side and a second side opposite to each other along a first direction, and includes a valve body 1 and a switch assembly 2 having a vent passage. The first side of the valve body 1 is provided with a mounting groove and a mounting passage 1c penetrating the valve body 1 along a first direction, and the mounting passage 1c is communicated with the mounting groove. The switch assembly 2 includes a switch member 24, a piston 22, and a push rod 23. At least a portion of the piston 22 is disposed in the mounting groove. The push rod 23 is provided with a connecting passage 23a and a connecting port 23d and an exhaust hole 23e located on a first side and a second side of the connecting passage 23a. The connecting passage 23a constitutes a part of the vent passage. One end of the push rod 23 provided with the connecting port 23d is connected to the piston 22, and is slidably disposed in the mounting passage 1c. The switch member 24 can be disposed in the connecting passage 23a through the connecting port 23d. The switch member 24 is used to undergo elastic deformation under the action of air pressure to move from a closed position closing the connecting passage 23a to an open position opening the connecting passage 23a. The switch member 24 is also used to return from the open position to the closed position under the action of its own elastic force.

[0077] For example, see Figure 6 The first direction is, for example, the axial direction of the valve body 1 .

[0078] The switch assembly 2 has a ventilation channel to enable the battery 100 to exhaust air to the outside or the outside to take air into the battery 100.

[0079] The connection method between the push rod 23 and the piston 22 is not limited here. For example, the push rod 23 and the piston 22 can be connected by a snap connection, a fastening connection, a threaded connection, or a plug connection.

[0080] The fastening connection includes but is not limited to screw connection, bolt connection or rivet connection and the like.

[0081] In a specific embodiment, the piston 22 is provided with a mounting post 22 b, and one end of the push rod 23 is provided with a connecting port 23 d and is threadedly connected to the mounting post 22 b.

[0082] The push rod 23 is slidably disposed in the installation channel 1c, that is, the push rod 23 can slide in the installation channel 1c along a first direction.

[0083] Exemplarily, the explosion-proof valve 10 further includes an end cover 21 , which is disposed on a first side of the piston 22 to protect the piston 22 and other internal structures.

[0084] The connection structure between the end cover 21 and the piston 22 is not limited here. Exemplarily, the end cover 21 and the piston 22 are connected together by bonding.

[0085] It should be noted that the specific shape of the push rod 23 is not limited here. Exemplarily, the push rod 23 is cylindrical.

[0086] It should be noted that the specific shape of the valve body 1 is not limited here. For example, in the cross section perpendicular to the first direction, the cross section of the valve body 1 is circular.

[0087] It should be noted that the specific shape of the piston 22 is not limited here. For example, in the cross section perpendicular to the first direction, the cross section of the piston 22 is circular.

[0088] It should be noted that the specific shape of the end cover 21 is not limited here. For example, in the cross section perpendicular to the first direction, the cross section of the end cover 21 is circular.

[0089] The push rod 23 is provided with a connecting channel 23a and a connecting port 23d and an exhaust hole 23e located on the first side and the second side of the connecting channel 23a. The internal space of the battery 100 is connected to the ventilation channel through the exhaust hole 23e. The push rod 23 can be connected to the piston 22 through the connecting port 23d, and the switch 24 can be set in the connecting channel 23a through the connecting port 23d.

[0090] The switch member 24 can be arranged in the connecting channel 23a through the connecting port 23d, so that it is possible to choose not to set a bottom plug for fixing the switch member 24 in the top rod 23. Therefore, the top rod 23 does not need to be provided with a fixing structure for fixing the bottom plug, which simplifies the structure of the top rod 23, and further simplifies the processing steps and processing difficulty of the top rod 23. Moreover, since there is no need to set a bottom plug, the setting of parts is reduced.

[0091] If the switch component 24 of the switch assembly 2 has a pressure difference on both sides of the switch component 24, the switch component 24 conducts the connection channel 23a, so that the entire ventilation channel is in a connected state, and the airflow on the high-pressure side automatically flows to the low-pressure side, so that the battery 100 exhausts air to the outside or the outside takes air into the battery 100, thereby achieving ventilation. If the switch component 24 of the switch assembly 2 has no pressure difference or a small pressure difference on both sides of the switch component 24, the switch component 24 closes the connection channel 23a, so that the entire ventilation channel is in a closed state.

[0092] The electrical device provided in the embodiment of the present application includes an explosion-proof valve 10, which includes a valve body 1 and a switch assembly 2. The switch assembly 2 is provided with a ventilation channel, and the top rod 23 is provided with a connecting channel 23a, and the connecting channel 23a constitutes a part of the ventilation channel. If the switch member 24 of the switch assembly 2 has a pressure difference between the air pressures on both sides thereof, the switch member 24 moves from a closed position closing the connecting channel 23a to an open position opening the connecting channel 23a, and the airflow on the high-pressure side automatically flows to the low-pressure side, so that the battery 100 is exhausted to the outside or the outside is taken in by the battery 100. By providing a connecting port 23d on the first side of the connecting channel 23a of the top rod 23, the switch member 24 can be provided in the connecting channel 23a through the connecting port 23d, so that it is possible to choose not to provide a bottom plug for fixing the switch member 24 in the top rod 23. Therefore, the top rod 23 does not need to be provided with a fixing structure for fixing the bottom plug, thereby simplifying the structure of the top rod 23, and further simplifying the processing steps and processing difficulty of the top rod 23, and can reduce parts, thereby improving production efficiency and reducing manufacturing costs.

[0093] In some embodiments, the top rod 23 is an integrated structure.

[0094] By setting the push rod 23 as an integrated structure, the push rod 23 is integrally formed with the connecting channel 23a, the connecting port 23d and the exhaust hole 23e, that is, the switch member 24 can be assembled and fixed to the connecting channel 23a only by the cooperation between the push rod 23 and the piston 22. The structure of the explosion-proof valve 10 and its push rod 23 is simplified, and then the processing steps and processing difficulty of the push rod 23 are simplified, and the parts can be reduced, thereby improving the production efficiency and reducing the manufacturing cost.

[0095] It should be noted that the specific installation method of the switch valve is not limited here.

[0096] In some embodiments, see Figure 6 and Figure 7 The second side of the connecting channel 23a has a first positioning surface 23n surrounding the exhaust hole 23e, and the second side of the piston 22 has a second positioning surface 22c. The push rod 23 and the piston 22 clamp the opposite ends of the switch member 24 between the first positioning surface 23n and the second positioning surface 22c.

[0097] Taking the threaded connection between the push rod 23 and the piston 22 as an example, in the process of the push rod 23 being screwed on the piston 22, the distance between the first positioning surface 23n and the second positioning surface 22c gradually decreases until the opposite ends of the switch member 24 are clamped on the first positioning surface 23n and the second positioning surface 22c. Since the threaded connection can realize the continuous adjustment of the distance between the first positioning surface 23n and the second positioning surface 22c, regardless of whether there is an error in the length of the switch member 24, the threaded connection between the push rod 23 and the piston 22 can clamp the switch member 24 between the two, eliminate the gap between the opposite ends of the switch member 24 and the first positioning surface 23n and the second positioning surface 22c, and adjust the elastic force between the switch member 24 and the push rod 23 and the piston 22.

[0098] In this embodiment, only the push rod 23 and the piston 22 are needed to clamp the switch member 24, and no screws or other fasteners are needed for fastening. When the push rod 23 is unscrewed, the switch member 24 can be directly pulled out from the connection port 23d of the connection channel 23a. When assembly is required, the switch member 24 is placed into the connection channel 23a from the connection port 23d, and then the push rod 23 is tightened. Disassembly and assembly are relatively convenient, and it is easy to adjust the elastic force between the switch member 24, the push rod 23 and the piston 22.

[0099] In some embodiments, see Figures 6 to 8 The switch member 24 includes a switch valve, a first elastic member 243 and a second elastic member 244. The two ends of the first elastic member 243 abut against the second positioning surface 22c and the first side of the switch valve respectively. The two ends of the second elastic member 244 abut against the first positioning surface 23n and the second side of the switch valve respectively.

[0100] It should be noted that the specific type of the first elastic member 243 is not limited here, for example, it can be a compression spring or a tension spring.

[0101] It should be noted that the specific type of the second elastic member 244 is not limited here, for example, it can be a compression spring or a tension spring.

[0102] The two ends of the first elastic member 243 abut against the second positioning surface 22c and the first side of the switch valve respectively, and the two ends of the second elastic member 244 abut against the first positioning surface 23n and the second side of the switch valve respectively. That is to say, the switch member 24 abuts against the second positioning surface 22c through the first elastic member 243, and abuts against the first positioning surface 23n through the second elastic member 244.

[0103] By setting the first elastic member 243 and the second elastic member 244, the two ends of the first elastic member 243 are respectively abutted against the second positioning surface 22c and the first side of the switch valve, and the two ends of the second elastic member 244 are respectively abutted against the first positioning surface 23n and the second side of the switch valve. The first elastic member 243 and / or the second elastic member 244 are elastically deformed to make the switch valve slide along the first direction in the installation channel 1c, thereby realizing the switch valve moving from the closed position closing the connecting channel 23a to the open position opening the connecting channel 23a, and resetting from the open position to the closed position under the elastic force of the first elastic member 243 and / or the second elastic member 244.

[0104] In some embodiments, see Figures 6 to 8 The switch valve includes a first sub-valve 242 and a second sub-valve 241. The first sub-valve 242 includes a connecting rod 242a and a sealing portion 242b extending radially outward from the connecting rod 242a. The inner side wall of the connecting channel 23a is formed with a step surface 23c facing the first side. The two ends of the second elastic member 244 are respectively in contact with the first positioning surface 23n and the second sub-valve 241, and the second sub-valve 241 is pressed against the step surface 23c. The two ends of the first elastic member 243 are respectively in contact with the sealing portion 242b and the second positioning surface 22c, and the sealing portion 242b is pressed against the second sub-valve 241. The connecting rod 242a is passed through the through hole 241a of the second sub-valve 241, and is in clearance fit with the through hole 241a.

[0105] It should be noted that the inner wall of the connecting channel 23a is formed with a step surface 23c facing the first side. Since the connecting port 23d is arranged on the first side of the connecting channel 23a, the step surface 23c is arranged to face the first side, which is beneficial for the second sub-valve 241 to abut against the step surface 23c, that is, it is beneficial for the switch member 24 to realize the opening and closing of the connecting channel 23a.

[0106] In this embodiment, description is made by taking the first elastic member 243 and the second elastic member 244 as compression springs as an example.

[0107] The two ends of the second elastic member 244 respectively abut against the first positioning surface 23n and the second sub-valve 241, and press the second sub-valve 241 against the step surface 23c. That is, the piston 22 presses the second sub-valve 241 against the step surface 23c through the second elastic member 244, so that the second sub-valve 241 is sealed and matched with the step surface 23c.

[0108] The two ends of the first elastic member 243 respectively abut the sealing portion 242b and the second positioning surface 22c, and press the sealing portion 242b against the second sub-valve 241. That is, the top rod 23 presses the sealing portion 242b against the second sub-valve 241 through the first elastic member 243, so that the sealing portion 242b is sealed and matched with the second sub-valve 241.

[0109] In some embodiments, see Figure 6 to Figure 7 The circumferential side wall of the sealing portion 242b is spaced apart from the inner side wall of the connecting channel 23a.

[0110] The circumferential side wall of the sealing portion 242b is spaced apart from the inner side wall of the connecting channel 23a, that is, there is a gap between the circumferential side wall of the sealing portion 242b and the inner side wall of the connecting channel 23a.

[0111] By spacing the circumferential side wall of the sealing portion 242b and the inner side wall of the connecting channel 23a, air flow can flow through the gap between the circumferential side wall of the sealing portion 242b and the inner side wall of the connecting channel 23a, thereby achieving ventilation.

[0112] In some embodiments, see Figure 6 to Figure 7 The circumferential side wall of the second sub-valve 241 is spaced apart from the inner side wall of the connecting channel 23a.

[0113] The circumferential side wall of the second sub-valve 241 is spaced apart from the inner side wall of the connecting channel 23 a , that is, there is a gap between the circumferential side wall of the second sub-valve 241 and the inner side wall of the connecting channel 23 a .

[0114] By spacing the circumferential side wall of the second sub-valve 241 and the inner wall of the connecting channel 23a, air can flow through the gap between the circumferential side wall of the second sub-valve 241 and the inner wall of the connecting channel 23a, thereby achieving ventilation.

[0115] When the switch member 24 has a pressure difference between the air pressures on both sides thereof, for example, when the air pressure inside the battery 100 is greater than the air pressure outside, the airflow inside the battery 100 pushes open the second sub-valve 241 so that there is a gap between the second sub-valve 241 and the step surface 23c, and compresses the second elastic member 244. The airflow inside the battery 100 enters the connecting channel 23a from the exhaust port, and flows through the gap between the sealing portion 242b and the inner wall of the connecting channel 23a, and then flows through the gap between the second sub-valve 241 and the step surface 23c, and is finally discharged to the outside. When the switch member 24 has no pressure difference between the air pressures on both sides thereof or the pressure difference is small, the second elastic member 244 restores its elastic deformation, and the second sub-valve 241 again abuts against and seals against the step surface 23c under the elastic force of the second elastic member 244. The switch member 24 closes the connecting channel 23a to close the air permeable channel. When the air pressure inside the battery 100 is lower than the external air pressure, the external airflow pushes open the sealing portion 242b so that there is a gap between the sealing portion 242b and the second sub-valve 241, and compresses the first elastic member 243. The external airflow enters the connecting channel 23a from the cavity 22a of the piston 22, and flows through the gap between the connecting rod 242a and the through hole 241a, and then flows through the gap between the sealing portion 242b and the second sub-valve 241, and finally enters the battery 100 through the air inlet and outlet. When the switch member 24 has no pressure difference on both sides or the pressure difference is small, the first elastic member 243 restores its elastic deformation, and the sealing portion 242b abuts against and seals against the second sub-valve 241 again under the elastic force of the first elastic member 243. The switch member 24 closes the connecting channel 23a to close the air permeable channel. In this way, the first elastic member 243 and the second elastic member 244 are elastically deformed under the action of air pressure, so that the first sub-valve 242 and the second sub-valve 241 move from a closed position closing the connecting channel 23a to an open position opening the connecting channel 23a. The first sub-valve 242 and the second sub-valve 241 are also used to reset from the open position to the closed position under the action of the elastic force of the first elastic member 243 and the second elastic member 244.

[0116] In some embodiments, the explosion-proof valve 10 further comprises a sheath (not shown) disposed on the second side of the valve body 1. The end of the push rod 23 away from the piston 22 is disposed in the sheath. The sheath is provided with an air hole connected to the air permeable channel.

[0117] The specific installation method of the sheath is not limited here. For example, the sheath is connected to the valve body 1, for example, it can be a threaded connection, a snap connection, a plug connection, etc.

[0118] The sheath is provided with an air hole connected to the air permeable channel, and the airflow in the battery 100 can enter the connecting channel 23a through the air hole.

[0119] By providing the sheath, other components inside the sheath can be protected.

[0120] In some embodiments, see Figure 4 and Figure 6 The valve body 1 is provided with an air outlet passage 1a penetrating the valve body 1 in a first direction, and the air outlet passage 1a is communicated with the mounting groove. The switch assembly 2 is used to undergo elastic deformation under the action of an external force, so as to move from a closed position closing the air outlet passage 1a to an open position opening the air outlet passage 1a, and the switch assembly 2 is also used to reset from the open position to the closed position under the action of its own elastic force.

[0121] It should be noted that the switch assembly 2 is used to undergo elastic deformation under the action of an external force, and the external force may be an air pressure difference or other external force.

[0122] The switch assembly 2 is slidable along the installation channel 1c to switch between the open position and the closed position.

[0123] By setting the switch assembly 2 to be able to selectively open or close the gas outlet channel 1a, if the air pressure in the battery 100 is too high, the air pressure will push the switch assembly 2 to move toward the second side while elastically deforming, so as to move from the closed position of closing the gas outlet channel 1a to the open position of opening the gas outlet channel 1a. This enables the rapid discharge of gas inside the power battery 100. When the external air pressure and the air pressure in the battery 100 reach equilibrium, the switch assembly 2 is also used to reset from the open position to the closed position under the action of its own elastic force.

[0124] It should be noted that the specific structure of the switch assembly 2 is not limited here.

[0125] In some embodiments, see Figure 4 There are multiple air outlet channels 1a, and each air outlet channel 1a is arranged at intervals along the circumference of the installation channel 1c.

[0126] There are multiple outlet channels 1a, each of which is spaced apart along the circumference of the installation channel 1c. By providing multiple outlet channels 1a, the valve body 1 has a sufficiently large air flow channel, and the intervals between the outlet channels 1a can also provide the valve body 1 with sufficient strength.

[0127] Specifically, the valve bodies 1 are evenly arranged along the circumference of the installation channel 1 c, which improves the uniformity of gas outlet and further improves the reliability of the explosion-proof valve 10 .

[0128] That is to say, by providing a plurality of air outlet channels 1 a , the valve body 1 has a sufficiently large air flow channel, and the intervals between the air outlet channels 1 a can also make the valve body 1 have sufficient strength, thereby improving the reliability of the explosion-proof valve 10 .

[0129] In some embodiments, see Figure 6 and Figure 7 The switch assembly 2 further includes a third elastic member 25. The circumferential side wall of the push rod 23 extends radially outward to form a step 23b, and the two ends of the third elastic member 25 are respectively in contact with the step 23b and the second side of the valve body 1. The piston 22 and the push rod 23 move toward the first side of the explosion-proof valve 10 under the action of an external force, so that the third elastic member 25 is elastically deformed and reset under the elastic force of the third elastic member 25.

[0130] The formation position of the step 23 b is not limited here. Exemplarily, the step 23 b is formed at an end of the push rod 23 away from the piston 22 .

[0131] The specific type of the third elastic member 25 is not limited here, for example, it can be a compression spring or a tension spring.

[0132] By providing the third elastic member 25, and making the two ends of the third elastic member 25 abut against the step 23b and the second side of the valve body 1, the piston 22 can be sealed with the groove wall of the installation groove by the elastic force of the third elastic member 25. If the air pressure inside the battery 100 is too high, the air pressure overcomes the elastic force of the third elastic member 25, pushes the switch assembly 2 toward the second side, and continues to compress the third elastic member 25. When the external air pressure and the air pressure inside the battery 100 reach equilibrium, the external force acting on the piston 22 is removed, and the piston 22 and the push rod 23 are reset to the closed position under the elastic force of the third elastic member 25.

[0133] In some embodiments, see Figure 6 A gas passage 10a is defined between the piston 22 and the end cover 21, and the gas passage 10a constitutes a part of the gas permeable passage.

[0134] In some embodiments, see Figure 6 The piston 22 has a cavity 22a inside, and the cavity 22a constitutes a part of the air permeable passage. The explosion-proof valve 10 also includes a ferromagnetic member 3 having a gas port 3a, and the ferromagnetic member 3 is arranged between the piston 22 and the end cover 21. The gas passage 10a is connected with the cavity 22a through the gas port 3a.

[0135] The ferromagnetic part 3 refers to ferromagnetic materials such as iron, steel, nickel, and cobalt.

[0136] When the ferromagnetic part 3 is not affected by the external magnetic field, the synthetic magnetic moment generated by its molecular current is macroscopically equal to zero, so it does not show magnetism. When the ferromagnetic material is introduced into the external magnetic field, the process of aligning the internal molecular magnetic moments under the action of the external magnetic field is called magnetization. Once some ferromagnetic materials are magnetized, even after the external magnetic field is removed, there is still a large residual magnetic induction intensity.

[0137] The ferromagnetic member 3 is provided with a gas port 3a, and the gas passage 10a is communicated with the cavity 22a through the gas port 3a.

[0138] By providing the ferromagnetic part 3, during the air tightness test of the explosion-proof valve 10, the magnetic attraction part in the explosion-proof valve 10 can be firstly attracted by a magnet, so that the switch component 2 undergoes elastic deformation under the action of an external force (the external force at this time is equivalent to the magnetic force between the magnet and the magnetic attraction part), and moves from a closed position closing the air outlet channel 1a to an open position opening the air outlet channel 1a, so that air can be inflated into the battery 100 through the air outlet channel 1a. After the inflation is completed, the magnet is removed (equivalent to removing the external force), and the switch component 2 is reset from the open position to the closed position under the action of its own elastic force, thereby realizing the air tightness test of the explosion-proof valve 10.

[0139] In some embodiments, the air opening 3 a extends in the radial direction of the ferromagnetic component 3 and penetrates the circumferential side wall of the ferromagnetic component 3 .

[0140] The gas port 3 a extends in the radial direction of the ferromagnetic component 3 , which facilitates the gas passage 10 a to communicate with the cavity 22 a inside the piston 22 through the gas port 3 a.

[0141] The specific length of the air port 3a along the ferromagnetic component 3 is not limited here, as long as the air passage 10a can be communicated with the cavity 22a inside the piston 22 through the air port 3a.

[0142] By arranging the air port 3a to extend in the radial direction of the ferromagnetic component 3 and to penetrate the circumferential side wall of the ferromagnetic component 3, the air passage 10a can be communicated with the cavity 22a inside the piston 22 through the air port 3a.

[0143] In some embodiments, see Figure 6 The explosion-proof valve 10 further includes a first sealing member 5 , which is sealingly disposed between the valve body 1 and the piston 22 and is located on the outer side of the gas outlet passage 1 a along the radial direction of the valve body 1 .

[0144] The specific type of the first sealing member 5 is not limited here, and it can be, for example, a sealing ring.

[0145] The specific material of the first sealing member 5 is not limited here, and it can be silicone, for example.

[0146] The first sealing member 5 is disposed on the outer side of the gas outlet channel 1 a along the radial direction of the valve body 1 , that is, the first sealing member 5 can be used to seal the flow path between the gas outlet channel 1 a and the outside.

[0147] By providing the first sealing member 5 , when the explosion-proof valve 10 is provided on the box body 21 , the first sealing member 5 is sealingly provided between the valve body 1 and the piston 22 , and is used to seal the installation gap between the valve body 1 and the piston 22 , thereby improving the sealing performance of the explosion-proof valve 10 .

[0148] It should be noted that the specific arrangement of the first sealing member 5 is not limited here.

[0149] Exemplarily, a groove wall of the installation groove is formed with an accommodating cavity, and the first sealing member 5 is disposed in the accommodating cavity.

[0150] In some embodiments, see Figure 6 The explosion-proof valve 10 further includes a second sealing member 6 , which is disposed on the second side of the valve body 1 .

[0151] The specific type of the second sealing member 6 is not limited here, and it can be a sealing ring, for example.

[0152] The specific material of the second sealing member 6 is not limited here, and can be, for example, silicone.

[0153] The second sealing member 6 is disposed on the second side of the valve body 1 , that is, the second sealing member 6 and the piston 22 are respectively disposed on two opposite sides of the valve body 1 along the first direction.

[0154] By providing the second sealing member 6 , when the explosion-proof valve 10 is provided on the box body 21 , the second sealing member 6 is sandwiched between the box body 21 and the valve body 1 to seal the installation gap between the box body 21 and the valve body 1 , thereby improving the sealing performance of the battery box 20 .

[0155] It should be noted that the connection method between the explosion-proof valve 10 and the box body 21 is not limited here.

[0156] For example, see Figures 3 to 6 A connecting seat 1d is provided on the peripheral side wall of the valve body 1, and a fastening hole is provided on the connecting seat 1d, so that the explosion-proof valve 10 and the box body 21 are fastenedly connected.

[0157] In some embodiments, on a projection plane perpendicular to the axis of the valve body 1, the projection of the air outlet channel 1a is located within the projection range of the piston 22. In the closed position, at least a portion of the piston 22 is sealed with the valve body 1. In the open position, the piston 22 is separated from the valve body 1, so that the airflow in the battery 100 can flow out through the gap between the air outlet channel 1a and the piston 22 and the valve body 1 in sequence.

[0158] On the projection plane perpendicular to the axis of the valve body 1, the projection of the air outlet channel 1a is located within the projection range of the piston 22, that is, the diameter of the air outlet channel 1a is smaller than the diameter of the piston 22, and the piston 22 can cover the air outlet channel 1a by sealing with the valve body 1, so that in the closed position, the piston 22 closes the air outlet channel 1a.

[0159] In some embodiments, see Figure 6The explosion-proof valve 10 further includes a waterproof breathable membrane 7 disposed in the mounting groove. The airflow in the breathable channel is discharged from the air passage 10a through the waterproof breathable membrane 7, or the airflow in the air passage 10a enters the breathable channel through the waterproof breathable membrane 7.

[0160] The waterproof breathable membrane 7 plays the role of breathability and waterproofing.

[0161] The waterproof breathable membrane 7 is always in a state of airflow exchange and can play a moisture-proof role, preventing external water vapor from entering the interior of the battery 100 through the breathable channel.

[0162] In the description of the present application, the description with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0163] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. An explosion-proof valve, applied to a battery box, characterized in that: The explosion-proof valve has a first side and a second side opposite to each other along a first direction, and comprises: A valve body, wherein a first side of the valve body is provided with a mounting groove and a mounting channel penetrating the valve body along a first direction, and the mounting channel is communicated with the mounting groove; A switch assembly with a vent channel, the switch assembly comprising a switch member, a piston and a push rod, at least a portion of the piston is disposed in the mounting groove, the push rod is provided with a connecting channel and a connecting port and an exhaust hole located on a first side and a second side of the connecting channel, the connecting channel constitutes a part of the vent channel, one end of the push rod provided with the connecting port is connected to the piston, and is slidably disposed in the mounting channel; In which, the switch component can be arranged in the connecting channel through the connecting port, and the switch component is used to undergo elastic deformation under the action of air pressure to move from a closed position closing the connecting channel to an open position opening the connecting channel, and the switch component is also used to reset from the open position to the closed position under the action of its own elastic force.

2. The explosion-proof valve according to claim 1, characterized in that: The second side of the connecting channel has a first positioning surface surrounding the exhaust hole, the second side of the piston has a second positioning surface, and the push rod and the piston clamp the opposite ends of the switch member between the first positioning surface and the second positioning surface.

3. The explosion-proof valve according to claim 2, characterized in that: The switch member includes a switch valve, a first elastic member and a second elastic member, wherein two ends of the first elastic member respectively abut against the second positioning surface and the first side of the switch valve, and two ends of the second elastic member respectively abut against the first positioning surface and the second side of the switch valve.

4. The explosion-proof valve according to claim 3, characterized in that: The switch valve comprises a first sub-valve and a second sub-valve, the first sub-valve comprises a connecting rod and a sealing portion extending radially outward from the connecting rod, and the inner side wall of the connecting channel is formed with a step surface facing the first side; The two ends of the second elastic member are respectively in contact with the first positioning surface and the second sub-valve, and the second sub-valve is pressed against the step surface; the two ends of the first elastic member are respectively in contact with the sealing portion and the second positioning surface, and the sealing portion is pressed against the second sub-valve, and the connecting rod is passed through the through hole of the second sub-valve and is gap-matched with the through hole.

5. The explosion-proof valve according to claim 4, characterized in that: The circumferential side wall of the sealing portion is spaced apart from the inner side wall of the connecting channel; and / or the circumferential side wall of the second sub-valve is spaced apart from the inner side wall of the connecting channel.

6. The explosion-proof valve according to any one of claims 1 to 5, characterized in that: The valve body is provided with an air outlet passage penetrating the valve body along a first direction, and the air outlet passage is communicated with the mounting groove; The switch assembly is used to undergo elastic deformation under the action of external force to move from a closed position closing the air outlet channel to an open position opening the air outlet channel. The switch assembly is also used to reset from the open position to the closed position under the action of its own elastic force.

7. The explosion-proof valve according to claim 6, characterized in that: The switch assembly further comprises a third elastic member, the circumferential side wall of the push rod extends radially outward to form a step, and two ends of the third elastic member abut against the step and the second side of the valve body respectively; The piston and the push rod move toward the first side of the explosion-proof valve under the action of external force, so that the third elastic member generates elastic deformation and is reset under the action of the elastic force of the third elastic member.

8. The explosion-proof valve according to claim 6, characterized in that: The explosion-proof valve further includes a first sealing member, which is sealingly disposed between the valve body and the piston and is located on the outer side of the gas outlet passage along the radial direction of the valve body.

9. The explosion-proof valve according to any one of claims 1 to 5, characterized in that: The explosion-proof valve further includes a second sealing member, which is disposed on a second side of the valve body; and / or the push rod is an integrated structure.

10. A battery box, characterized in that: It comprises a box body and the explosion-proof valve according to any one of claims 1 to 9, wherein an installation space is provided in the box body, the explosion-proof valve is arranged on the box body, and the air permeable passage is communicated with the installation space.

11. A battery, characterized in that: The battery box comprises at least one battery cell and the battery box according to claim 10, wherein the battery cell is arranged in the installation space.

12. An electrical device, characterized in that: The battery according to claim 11 is used to provide electrical energy to the electrical device.

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