Explosion-proof valve, battery pack and vehicle

Abstract

This application provides an explosion-proof valve, a battery pack, and a vehicle, relating to the field of battery explosion-proof technology, to address the problem of low internal integration and inconvenience in disassembly and installation of existing explosion-proof valves. The explosion-proof valve includes a valve body, a valve cover, a housing, and an adjustment assembly. An installation cavity is formed inside the valve body, with a first opening and a second opening communicating with the installation cavity. The first opening communicates with the interior of a housing. The valve cover is positioned over the second opening and connected to the valve body. An airflow channel is formed between the valve cover and the valve body. One end of the airflow channel communicates with the second opening. The second opening communicates with the outside through the airflow channel. The housing is positioned at the first opening and seals it. An adjustment cavity is formed inside the housing, with a first air inlet and a second air inlet communicating with the adjustment cavity. The adjustment assembly is disposed within the adjustment cavity. This explosion-proof valve has a high degree of integration, making the disassembly and installation of the internal components of the valve body more convenient.

Description

Technical Field

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

[0002] As people's living standards improve, cars have gradually become an essential means of transportation for most families. Among them, electric vehicles, with their advantages of being pollution-free and energy-saving, are gradually occupying a major share of the automotive market. The battery pack is a crucial component of electric vehicles, providing them with an energy source.

[0003] A battery pack typically includes a casing and a battery pack housed inside the casing. During use, the battery pack may cause gas expansion inside the casing, leading to an imbalance between the internal and external air pressure. Therefore, the casing is usually equipped with an explosion-proof valve to prevent excessive internal expansion that could cause the casing to explode. CN114530668B discloses an explosion-proof valve, which includes a piston, a valve body, a spring, and a two-way constant pressure vent valve. The piston passes through the middle of the valve body and is fitted with a spring, with its lower end threadedly connected to the two-way constant pressure vent valve. A protective cover is installed on the valve body around the spring and the two-way constant pressure vent valve, with a gap between the protective cover and the valve body. The end of the protective cover furthest from the valve body is a sealed end. CN218783185U discloses a battery pack including an explosion-proof valve. The explosion-proof valve includes: a valve body mounted on a housing; a dehumidification device mounted inside the portion of the valve body located on the outside of the housing; a top cover mounted on one end of the valve body located on the outside of the housing; and a transparent plate mounted on the top cover, through which the dehumidification device can be viewed.

[0004] However, the components of the aforementioned explosion-proof valve are directly installed inside the valve body, resulting in low integration and making it inconvenient to install and disassemble the internal components. Summary of the Invention

[0005] The purpose of this application is to provide an explosion-proof valve, a battery pack, and a vehicle to solve the problem that the existing explosion-proof valves have low internal structure integration and are inconvenient to disassemble and install.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] On one hand, this application provides an explosion-proof valve for installation on the casing of a battery pack. The explosion-proof valve includes a valve body, a valve cover, a housing, and an adjusting assembly. An installation cavity is formed inside the valve body, and a first opening and a second opening communicating with the installation cavity are provided. The first opening communicates with the interior of the casing. The valve cover is disposed at the second opening and connected to the valve body. An airflow channel is formed between the valve cover and the valve body. One end of the airflow channel communicates with the second opening. The second opening communicates with the outside through the airflow channel. The housing is disposed at the first opening and seals the first opening. An adjusting cavity is formed inside the housing, and a first air inlet and a second air inlet communicating with the adjusting cavity are provided. The first opening communicates with the adjusting cavity through the first air inlet, and the second air inlet communicates with the installation cavity. The adjusting assembly is disposed within the adjusting cavity and is used to move under air pressure, so that the first air inlet and the second air inlet communicate through the adjusting cavity to adjust the air pressure inside the casing.

[0008] According to the above technical means, the explosion-proof valve provided in this application embodiment has an installation cavity inside the valve body that can form an installation space, providing installation space for the outer shell and the adjustment component. The valve body has a first opening and a second opening communicating with the installation cavity. Simultaneously, one end of the airflow channel formed between the valve body and the valve cover is connected to the second opening. Thus, when the first opening is connected to the interior of the housing, gas inside the housing can enter the installation cavity through the first opening and flow out of the installation cavity through the airflow channel. Conversely, external gas can also flow into the installation cavity through the airflow channel and into the interior of the housing through the first opening. The outer shell has a first air inlet and a second air inlet communicating with the adjustment cavity, and the first opening can communicate with the adjustment cavity through the first air inlet. Thus, when the internal air pressure and external air pressure reach a certain threshold, the adjustment component can control the first and second air inlets to communicate through the adjustment cavity. Gas inside the housing can then enter the adjustment cavity through the second opening and the first air inlet, and finally flow into the installation cavity through the second air inlet and out of the installation cavity. The adjustment component provided in this application embodiment is located inside the outer shell. In this way, when installing and disassembling, only the outer shell needs to be installed inside the valve body, without the need for separate installation inside the housing. This results in better integration and makes installation and disassembly more convenient.

[0009] In one possible implementation, the outer casing has a top wall, a bottom wall, and a side wall located between the top wall and the bottom wall. The side wall is arranged around the bottom wall, forming an adjustment cavity with the top wall and the side wall. The bottom wall has a first air inlet. The side wall has a plurality of second air inlets, and the top wall has a third air inlet. The plurality of second air inlets include a first sub-air inlet and a second sub-air inlet. The first sub-air inlet and the second sub-air inlet are arranged in a direction perpendicular to the bottom wall. The adjustment assembly includes an inner shell and a first elastic member. The outer peripheral wall of the inner shell abuts against the side wall, forming a communicating cavity inside. The inner shell has a first communicating opening on the side near the bottom wall. The outer peripheral wall of the inner shell has a second communicating opening communicating with the communicating cavity. The first elastic member is located between the top wall and the inner shell, with one end connected to the top wall and the other end connected to the inner shell. Alternatively, the first elastic member is located between the bottom wall and the inner shell, with one end connected to the bottom wall and the other end connected to the inner shell.

[0010] According to the above-mentioned technical means, when the air pressure inside the housing is high, the air pressure inside the housing can drive the inner shell to move towards the top wall, thereby causing the first elastic element to undergo elastic deformation. At this time, the second connecting port can be arranged opposite to the second sub-inlet. In this way, the gas inside the housing can enter the connecting cavity through the first connecting port. At this time, the gas in the connecting cavity can enter the mounting cavity through the second connecting port and the second sub-inlet, and finally flow out to the outside of the valve body to achieve pressure relief. Conversely, when the external air pressure is greater than the air pressure inside the housing, the external gas can enter the regulating cavity through the third inlet, and push the inner shell to move towards the bottom wall, causing the first elastic element to undergo elastic deformation. At this time, the external gas can enter the connecting cavity through the second sub-inlet and the second connecting port, and after passing through the first connecting port and the first inlet in sequence, enter the interior of the housing through the first opening, thereby achieving pressurization of the internal housing.

[0011] In one possible implementation, there are multiple first sub-intake ports and multiple second sub-intake ports. The multiple first sub-intake ports are spaced apart circumferentially along the sidewall. The multiple second sub-intake ports are also spaced apart circumferentially along the sidewall. There are multiple second connecting ports. The multiple second connecting ports are spaced apart circumferentially along the outer peripheral wall of the inner shell, serving to be respectively opposite to the multiple first sub-intake ports and also to be respectively opposite to the multiple second sub-intake ports.

[0012] Based on the above technical means, by setting multiple second connection ports, the gas transmission efficiency can be improved, thereby making the pressure relief effect of the explosion-proof valve better and faster, and better able to cope with the possible rapid rise in pressure inside the box, ensuring the stability of the gas pressure inside the box.

[0013] In one possible implementation, the first elastic element is located between the top wall and the inner shell, with one end connected to the top wall and the other end connected to the inner shell. The adjustment assembly also includes a second elastic element. The second elastic element is located between the bottom wall and the inner shell, with one end connected to the bottom wall and the other end connected to the inner shell.

[0014] Based on the aforementioned technical means, the inner shell can be limited by the second elastic elements on both sides, resulting in a better limiting effect. When the air pressure inside the housing is within the normal range, the second connecting port is offset from the first and second sub-intake ports. At this time, the first and second elastic elements are used to limit the inner shell, and the force required for the inner shell to move is relatively large, thus allowing for more stable movement.

[0015] In one possible implementation, the first elastic element includes a first spring.

[0016] According to the above-mentioned technical means, the first spring can generate compressive elastic deformation and tensile elastic deformation, so that the first spring can generate elastic force to pull the inner shell to reset during the reciprocating motion of the inner shell inside the outer shell.

[0017] In one possible implementation, the second elastic element includes a second spring.

[0018] According to the above-mentioned technical means, the second spring can also generate compressive elastic deformation and tensile elastic deformation, so that the second spring can generate elastic force to pull the inner shell to reset during the reciprocating motion of the inner shell inside the outer shell.

[0019] In one possible implementation, a first protrusion is formed on the top wall near the inner shell. One end of the first spring is fitted onto the first protrusion.

[0020] According to the above-mentioned technical means, the displacement of the end of the first spring near the top wall can be restricted by the first protrusion, so that it can generate a better elastic force in the direction perpendicular to the top wall and better drive the inner shell to reset.

[0021] In one possible implementation, a second protrusion is formed on the side of the inner shell near the top wall. The other end of the first spring is fitted onto the second protrusion.

[0022] According to the above-mentioned technical means, the displacement of the end of the first spring near the inner shell can be restricted by the second protrusion, so that it can generate a better elastic force in the direction perpendicular to the top wall and better drive the inner shell to reset.

[0023] In one possible implementation, a third protrusion is formed on the bottom wall near the inner shell. One end of the second spring is fitted onto the third protrusion.

[0024] According to the above technical means, the displacement of the end of the second spring near the bottom wall can be restricted by the third protrusion, so that it can generate elastic force in the direction perpendicular to the bottom wall and better drive the inner shell to reset.

[0025] In one possible implementation, a fourth protrusion is formed on the side of the inner shell near the bottom wall. The other end of the second spring is fitted onto the fourth protrusion.

[0026] According to the above technical means, the displacement of the end of the second spring near the inner shell can be restricted by the fourth protrusion, so that it can generate a better elastic force in the direction perpendicular to the bottom wall and better drive the inner shell to reset.

[0027] In one possible implementation, the explosion-proof valve further includes a seal. The seal is fitted onto the housing, and a portion of the seal is disposed opposite a portion of the first opening. The seal is used to abut against the surface of the valve body where the first opening is located, to seal the first opening together with the housing. The seal is also used to be spaced apart from the portion of the first opening under air pressure, to open a portion of the first opening.

[0028] According to the aforementioned technical means, when the internal air pressure of the chamber is high, the pressure can directly drive the sealing element upward, thereby opening a portion of the first opening. The internal air pressure can then quickly flow out through the first opening, achieving rapid pressure relief. Simultaneously, since the sealing element is fitted onto the outer shell, once the internal air pressure stabilizes, the sealing element can fall down along the extension direction of the outer shell. At this point, the sealing element can again partially cover the first opening, ensuring a relatively sealed internal air pressure.

[0029] In one possible implementation, the explosion-proof valve further includes a sealing ring. The sealing ring is disposed within the mounting cavity, on the surface of the valve body where the first opening is located, and surrounds the periphery of the first opening to abut against a sealing element.

[0030] Based on the above technical means, when the sealing element and the sealing ring come into contact, the sealing ring can be used to seal better, resulting in a better sealing effect.

[0031] In one possible implementation, the explosion-proof valve further includes a moisture-absorbing membrane covering the second opening. A valve cover is located on the side of the moisture-absorbing membrane away from the mounting cavity, and a portion of it abuts against the moisture-absorbing membrane.

[0032] Based on the above-mentioned technical means, the moisture-absorbing membrane can remove the moisture from the air entering the box, ensuring that the air inside the box is dry and avoiding safety hazards caused by dampness inside the box.

[0033] In one possible implementation, the valve cover includes a top cover and a side cover. The top cover is disposed at the second opening. The side cover is disposed around the top cover and connected to the top cover. The side cover is sleeved around the periphery of the valve body. A plurality of limiting portions are formed at the end of the valve body near the valve cover. A plurality of hooks are formed at the end of the side cover away from the top cover. The hooks are located on the side of the limiting portions away from the top cover, and a portion of the side cover and the top cover have gaps with the valve body to form an airflow channel.

[0034] According to the above-mentioned technical means, through the cooperation of multiple hooks and limiting parts, the valve cover and valve body can be snapped together, realizing the interconnection between the valve body and the valve cover. At the same time, a part of the side cover and the top cover have gaps with the valve body to form an airflow channel. In this way, airflow can flow along the airflow channel formed by the gaps between the side cover, the top cover and the valve body.

[0035] On the other hand, embodiments of this application provide a battery pack including any of the explosion-proof valves described in the preceding aspect.

[0036] Since the battery pack provided in this application includes any of the above-mentioned explosion-proof valves, it can solve the same technical problems as the above-mentioned explosion-proof valves and achieve the same technical effects, it will not be described again here.

[0037] In another aspect, embodiments of this application provide a vehicle including the battery pack described in the preceding aspect.

[0038] Since the vehicle provided in this application includes the above-mentioned battery pack, it can solve the same technical problems as the above-mentioned battery pack and achieve the same technical effects, it will not be described again here. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of an explosion-proof valve provided in an embodiment of this application;

[0040] Figure 2 A cross-sectional view of an explosion-proof valve provided in an embodiment of this application;

[0041] Figure 3 A cross-sectional view of a pressure regulating device provided in an embodiment of this application;

[0042] Figure 4 This is a cross-sectional view when the second connecting port is connected to the second sub-inlet.

[0043] Figure 5 This is a schematic diagram of the structure when the second connecting port is connected to the first sub-inlet.

[0044] Figure 6 A schematic diagram showing the structure when the seal and the first opening are spaced apart. Attached image description:

[0046] 100-Explosion-proof valve; 10-Valve body; 101-First opening; 102-Second opening; 103-Limiting part; 104-Abutting part; 20-Valve cover; 21-Top cover; 22-Side cover; 221-Hook; 30-Valve body sealing ring; 40-Pressure regulating device; 41-Outer shell; 411-Top wall; 4111-Third air inlet; 4112-First protrusion; 412-Bottom wall; 4121-First air inlet; 4122 - Third protrusion; 413-Side wall; 4131-Second air inlet; 4132-First sub-air inlet; 4133-Second sub-air inlet; 42-Adjusting component; 421-Inner shell; 4211-First connecting port; 4212-Second connecting port; 4213-Second protrusion; 4214-Fourth protrusion; 422-First elastic element; 423-Second elastic element; 50-Sealing element; 60-Sealing ring; 70-Moisture-absorbing film. Detailed Implementation

[0047] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0048] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0049] With the improvement of people's living standards and the advancement of technology, electric vehicles have gradually become the main means of transportation. Among them, the battery pack, as a major component of electric vehicles, plays a crucial role in providing power, and the safety of the battery pack is a key issue that needs to be addressed in electric vehicles.

[0050] A battery pack typically consists of a casing and batteries housed within it. During charging and discharging, the batteries release a significant amount of heat, causing the gas inside the casing to expand and increasing internal pressure. Therefore, battery packs generally include an explosion-proof valve, installed on the casing, which rapidly releases pressure in the event of thermal runaway or other abnormal conditions, preventing serious safety incidents such as explosions or fires.

[0051] In related technologies, explosion-proof valves incorporate various components within their valve bodies to achieve pressure regulation. However, because these components are directly housed inside the valve body, installation and disassembly require separate installation and removal of each component within the valve body, resulting in low integration and cumbersome installation and disassembly processes.

[0052] Based on this, this application provides a vehicle, which can be an electric vehicle, a hybrid vehicle, a solar-powered vehicle, etc., and the specific type of vehicle is not specifically limited here. In order to realize the basic functions of a car, the car may include components such as a body, chassis, power system, and electrical system.

[0053] The vehicle body may include a frame, doors, and windows. The frame forms the overall external shape of the vehicle and creates the passenger space. Doors can be rotatably connected to the frame, allowing the interior of the passenger space to be opened or closed. Windows can be mounted on the doors or the frame, providing passengers with a view of the outside environment.

[0054] The chassis may include components such as the transmission system and the drive system. The drive system drives the wheels to rotate. Depending on the drive method, drive systems can be classified as front-wheel drive, rear-wheel drive, and four-wheel drive. The transmission system transmits power generated by the engine to the wheels.

[0055] A powertrain provides power to a vehicle, enabling it to perform basic driving functions. The composition of the powertrain varies depending on the type of vehicle. For example, when the vehicle is an electric vehicle, the powertrain may include an electric motor.

[0056] To supply power to electrical components such as electric motors, the vehicle provided in this application embodiment also includes a battery system. The battery system may include a battery pack, which can be used to provide electrical energy. The battery pack can be electrically connected to the vehicle's electrical components. In this way, the electrical energy from the battery pack can be transferred to the vehicle's electrical components to provide power.

[0057] The battery pack provided in this application embodiment may include a housing and a battery pack disposed within the housing. The battery pack serves as a power source, electrically connected to other electrical components of the vehicle to provide power to those components. The interior of the housing provides an installation space where the battery pack can be installed. Simultaneously, the housing also provides a degree of protection for the battery pack.

[0058] It is known that battery packs generate significant heat during charging and discharging, which can increase the internal pressure of the enclosure to some extent. Therefore, to prevent an explosion due to excessive internal pressure, the battery pack provided in this embodiment may further include an explosion-proof valve, which can be installed on the enclosure. The explosion-proof valve allows communication between the inside and outside of the enclosure. When the internal pressure is too high, the explosion-proof valve connects the enclosure to the outside, allowing the gas inside to be released and balance the internal pressure.

[0059] The explosion-proof valve provided in the embodiments of this application will be further described below. For example... Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of an explosion-proof valve 100 provided in an embodiment of this application. The explosion-proof valve 100 may include a valve body 10 and a valve cover 20. The valve body 10 can be connected to the battery pack housing to achieve fixation between the explosion-proof valve 100 and the housing. For example, as shown... Figure 1 As shown, the valve body 10 can be generally cylindrical, and its outer wall can have external threads. Correspondingly, a connecting hole can be formed on the housing, and the inner wall of the connecting hole has internal threads. Thus, through the external threads on the valve body 10 and the internal threads of the connecting hole on the housing, a threaded connection can be achieved between the valve body 10 and the housing, allowing the explosion-proof valve 100 to be installed on the housing. It is understood that, in order to allow gas inside the housing to flow out through the explosion-proof valve 100, the connecting hole on the housing can communicate with the interior of the housing.

[0060] like Figure 2 As shown, Figure 2 This is a cross-sectional view of an explosion-proof valve 100 provided in an embodiment of this application. The valve body 10 has an internal mounting cavity, and a first opening 101 and a second opening 102 communicating with the mounting cavity. The first opening 101 can communicate with the interior of the casing. Thus, gas inside the battery pack casing can enter the mounting cavity through the first opening 101. Meanwhile, as... Figure 2 As shown, the valve cover 20 is positioned over the second opening 102 and connected to the valve body 10. An airflow channel is formed between the valve cover 20 and the valve body 10. One end of the airflow channel communicates with the second opening 102. The second opening 102 can communicate with the outside through the airflow channel. Thus, the gas inside the mounting cavity can flow out through the airflow channel, thereby achieving the effect of venting the gas inside the battery pack.

[0061] To achieve the connection between the valve body 10 and the valve cover 20, in some embodiments, such as Figure 2As shown, the valve cover 20 may include a top cover 21 and a side cover 22. The top cover 21 is disposed at the second opening 102. The side cover 22 is disposed around the top cover 21, connected to the top cover 21, and sleeved on the periphery of the valve body 10. A plurality of limiting portions 103 may be formed at the end of the valve body 10 near the valve cover 20. A plurality of hooks 221 may be formed at the end of the side cover 22 away from the top cover 21. The hooks 221 are located on the side of the limiting portions 103 away from the top cover 21. Thus, as... Figure 2 As shown, through the mutual cooperation of multiple hooks 221 and limiting part 103, valve cover 20 and valve body 10 can be snapped together to realize the mutual connection between valve body 10 and valve cover 20.

[0062] Meanwhile, a portion of the side cover 22 and the top cover 21 form an airflow channel with a gap between them and the valve body 10. This allows airflow to pass through the airflow channel formed by the gap between the side cover 22, the top cover 21, and the valve body 10. Of course, in other embodiments, the airflow channel can also be a connecting hole formed on the top cover 21; the specific design can be tailored to actual needs.

[0063] In some embodiments, continue to refer to Figure 2 An abutment portion 104 may be formed on the periphery of the valve body 10 near the valve cover 20. The abutment portion 104 is arranged around the circumference of the valve cover 20. In this way, after the valve body 10 and the housing are connected, the abutment portion 104 can abut against the surface of the housing, thereby preventing communication between the inside of the housing and the outside through the gap between the valve body 10 and the housing connection hole, and ensuring the sealing of the housing and the explosion-proof valve 100.

[0064] In addition, such as Figure 2 As shown, in some embodiments, the explosion-proof valve 100 may further include a valve body sealing ring 30. The valve body sealing ring 30 is located on the side of the abutment portion 104 away from the valve cover 20, is disposed on the valve body 10, and is arranged around the valve body 10. In this way, the valve body sealing ring 30 can play a sealing role, thereby better ensuring the sealing performance between the enclosure and the explosion-proof valve 100.

[0065] Continue to refer to Figure 2 To achieve the pressure regulation function of the explosion-proof valve 100, the explosion-proof valve 100 provided in this application embodiment may further include a pressure regulating device 40. The pressure regulating device 40 may be located within the mounting cavity. The pressure regulating device 40 can be used to connect the first opening 101 and the second opening 102 through the mounting cavity when the internal air pressure and external air pressure reach a certain difference, thereby regulating the pressure balance within the chamber. The pressure regulating device 40 can also be used to prevent the first opening 101 and the second opening 102 from communicating with each other, thereby ensuring the sealing performance of the chamber.

[0066] In some embodiments, such as Figure 3 As shown, Figure 3 This is a cross-sectional view of a pressure regulating device 40 provided in an embodiment of this application. The pressure regulating device 40 may include a housing 41 and an regulating assembly 42. The housing 41 has an internal regulating cavity and is provided with a first air inlet 4121 and a second air inlet 4131 communicating with the regulating cavity. The first opening 101 (… Figure 2 The first opening 101 is connected to the adjustment chamber via the first air inlet 4121, and the second air inlet 4131 is connected to the mounting chamber. Thus, the first opening 101 is connected to the mounting chamber via the first air inlet 4121, and the second air inlet 4131 is connected to the mounting chamber, ultimately allowing the first opening 101 to connect with the mounting chamber.

[0067] The regulating component 42 is disposed within the regulating cavity and is used to move under air pressure, connecting the first air inlet 4121 and the second air inlet 4131 through the regulating cavity to regulate the air pressure inside the chamber. Thus, when the air pressure inside the chamber and the external air pressure reach a certain threshold, the regulating component 42 can control the first air inlet 4121 and the second air inlet 4131 to connect through the regulating cavity. The gas inside the chamber can then enter the regulating cavity through the second opening 102 via the first air inlet 4121, and finally flow into the mounting cavity through the second air inlet 4131 and out of the mounting cavity.

[0068] Therefore, the explosion-proof valve 100 provided in this embodiment of the application has an installation cavity inside the valve body 10 that can form an installation space, providing installation space for the housing 41 and the adjustment assembly 42. The valve body 10 has a first opening 101 and a second opening 102 communicating with the installation cavity. Simultaneously, one end of the airflow channel formed between the valve body 10 and the valve cover 20 communicates with the second opening 102. Thus, when the first opening 101 communicates with the interior of the housing, gas inside the housing can enter the installation cavity through the first opening 101 and flow out of the installation cavity through the airflow channel. Conversely, external gas can also flow into the installation cavity through the airflow channel and into the interior of the housing through the first opening 101. The housing 41 has a first air inlet 4121 and a second air inlet 4131 communicating with the adjustment cavity, and the first opening 101 can communicate with the adjustment cavity through the first air inlet 4121. Thus, when the internal air pressure and external air pressure reach a certain threshold, the regulating component 42 can control the first air inlet 4121 and the second air inlet 4131 to connect through the regulating chamber. Gas inside the chamber can then enter the regulating chamber through the second opening 102 via the first air inlet 4121, and finally flow into the mounting chamber through the second air inlet 4131 and out of the mounting chamber. Since the regulating component 42 provided in this embodiment is located inside the outer casing 41, installation and disassembly only require installing the outer casing 41 inside the valve body 10, eliminating the need for separate installation inside the casing. This results in better integration and more convenient installation and disassembly.

[0069] In some embodiments, such as Figure 3 As shown, the outer casing 41 may have a top wall 411, a bottom wall 412, and a side wall 413 located between the top wall 411 and the bottom wall 412. The side wall 413 is arranged around the bottom wall 412, forming an adjustment cavity with the top wall 411 and the side wall 413. The bottom wall 412 has a first air inlet 4121. The side wall 413 has a plurality of second air inlets 4131, and the top wall 411 has a third air inlet 4111. The plurality of second air inlets 4131 include a first sub-air inlet 4132 and a second sub-air inlet 4133. The first sub-air inlet 4132 and the second sub-air inlet 4133 are arranged in a direction perpendicular to the bottom wall 412.

[0070] Meanwhile, the adjusting assembly 42 includes an inner shell 421 and a first elastic element 422. The outer peripheral wall of the inner shell 421 abuts against the side wall 413, forming a communicating cavity inside. A first communicating port 4211 is provided on the side of the inner shell 421 near the bottom wall 412. A second communicating port 4212 communicating with the communicating cavity is provided on the outer peripheral wall of the inner shell 421. Thus, when the second communicating port 4212 on the outer peripheral wall of the inner shell 421 is connected to the second air inlet 4131, the first air inlet 4121 and the second air inlet 4131 can communicate with each other through the communicating cavity. At this time, the inside of the housing can communicate with the outside. When the second communicating port 4212 and the second air inlet 4131 on the outer peripheral wall of the inner shell 421 are misaligned, the first air inlet 4121 and the second air inlet 4131 are blocked from connecting by the side wall 413 of the inner shell 421.

[0071] like Figure 3 As shown, the first elastic element 422 is located between the top wall 411 and the inner shell 421, with one end connected to the top wall 411 and the other end connected to the inner shell 421. Alternatively, the first elastic element 422 is located between the bottom wall 412 and the inner shell 421, with one end connected to the bottom wall 412 and the other end connected to the inner shell 421. For example, as shown... Figure 3 As shown, the first elastic element 422 is located between the top wall 411 and the inner shell 421, with one end connected to the top wall 411 and the other end connected to the inner shell 421.

[0072] Therefore, as Figure 3 As shown, when the air pressure inside the box is high, the air pressure inside the box can drive the inner shell 421 to move towards the top wall 411, thereby causing the first elastic element 422 to undergo elastic deformation. At this time, the second connecting port 4212 can be positioned opposite to the second sub-air inlet 4133. In this way, the gas inside the box can enter the connecting cavity through the first connecting port 4211. At this time, as... Figure 4 As shown, Figure 4 This is a cross-sectional view of the second connecting port 4212 and the second sub-inlet port 4133 in connection. The gas in the connecting cavity can enter the mounting cavity through the second connecting port 4212 and the second sub-inlet port 4133, and finally flow out to the outside of the valve body 10 to achieve pressure relief.

[0073] Conversely, refer to Figure 3 When the external air pressure is greater than the internal air pressure, external air can enter the regulating chamber through the third air inlet 4111, pushing the inner shell 421 towards the bottom wall 412, causing the first elastic element 422 to undergo elastic deformation. At this time, as... Figure 5 As shown, Figure 5This is a schematic diagram showing the structure when the second connecting port 4212 is connected to the first sub-inlet port 4132. External gas can enter the connecting cavity through the first sub-inlet port 4132 and the second connecting port 4212, and then pass through the first connecting port 4211 in sequence. Figure 3 ) and the first air intake 4121 ( Figure 3 After that, it enters the interior of the box through the first opening 101, thereby pressurizing the interior of the box.

[0074] It is understandable that when the air pressure inside the box and the air pressure outside are in a certain balance, the second connecting port 4212 on the inner shell 421 is staggered from the first sub-air inlet 4132 and the second sub-air inlet 4133, so that the inside of the box is in a relatively sealed state.

[0075] Of course, the regulating component 42 can also have other components to achieve air pressure regulation in other ways, as long as air pressure regulation can be achieved. For example, in some embodiments, the regulating component 42 may include a rotating shaft and a partition plate. The axis of the rotating shaft may be parallel to the bottom wall 412. The partition plate may be disposed between the bottom wall 412 and the top wall 411. At the same time, the first air inlet 4121 and the second air inlet 4131 may be respectively disposed on the bottom wall 412 and the top wall 411. In this way, when the air pressure inside the chamber is relatively stable, the partition plate can divide the regulating chamber into two independent chambers. When the air pressure drives the partition plate to rotate, the two chambers are connected to each other, thereby realizing the connection between the first air inlet 4121 and the second air inlet 4131, and thus achieving air pressure regulation.

[0076] based on Figure 3 The scheme shown is as follows: Figure 3 As shown, in some embodiments, there are multiple first sub-inlet ports 4132 and multiple second sub-inlet ports 4133. Multiple first sub-inlet ports 4132 are spaced apart circumferentially along the sidewall 413. Multiple second sub-inlet ports 4133 are also spaced apart circumferentially along the sidewall 413. Multiple second connecting ports 4212 are also spaced apart circumferentially along the outer peripheral wall of the inner shell 421, serving as opposite to both the multiple first sub-inlet ports 4132 and the multiple second sub-inlet ports 4133. Therefore, by providing multiple second connecting ports 4212, gas transmission efficiency can be improved, resulting in better and faster pressure relief of the explosion-proof valve 100, better handling of sudden pressure increases within the enclosure, and ensuring stable gas pressure within the enclosure.

[0077] Of course, in some other embodiments, the number of the first sub-inlet 4132, the second sub-inlet 4133, and the second connecting port 4212 can also be one. In this case, the size of the first sub-inlet 4132, the second sub-inlet 4133, and the second connecting port 4212 can be designed to be relatively large, which can also ensure the pressure relief effect of the explosion-proof valve 100.

[0078] In some embodiments, as Figure 3 As shown, the adjustment assembly 42 may further include a second elastic element 423. The second elastic element 423 is located between the bottom wall 412 and the inner shell 421, with one end connected to the bottom wall 412 and the other end connected to the inner shell 421. In this case, the inner shell 421 can be limited by the second elastic elements 423 on both sides, resulting in a better limiting effect. When the internal air pressure is within the normal range, the second connecting port 4212 is offset from the first sub-inlet 4132 and the second sub-inlet 4133. At this time, by using the first elastic element 422 and the second elastic element 423 to limit the inner shell 421, the force required for the inner shell 421 to move is relatively large, thus allowing for more stable movement.

[0079] It is understandable that the elastic force of the first elastic element 422 and the second elastic element 423 can be designed according to actual needs so that the air pressure value inside the box corresponding to the force required to move the second connecting port 4212 of the inner shell 421 to connect with the first sub-air inlet 4132 or the second sub-air inlet 4133 is within the critical range, so as to avoid the second connecting port 4212 of the inner shell 421 being unable to be pushed to be positioned opposite the first sub-air inlet 4132 or the second sub-air inlet 4133 when the internal pressure value of the box is too high.

[0080] In one possible implementation, the first elastic element 422 may include a first spring. The first spring can generate compressive elastic deformation and tensile elastic deformation, so that during the reciprocating motion of the inner shell 421 within the outer shell 41, the first spring can generate elastic force to pull the inner shell 421 to return to its original position.

[0081] Similarly, in some embodiments, the second elastic element 423 may also include a second spring. Thus, the second spring can also produce compressive elastic deformation and tensile elastic deformation, so that during the reciprocating motion of the inner shell 421 within the outer shell 41, the second spring can generate elastic force to pull the inner shell 421 back to its original position.

[0082] Of course, the first elastic element 422 and the second elastic element 423 can also be other components that can generate elasticity. The specific selection can be made according to the actual situation, and no further examples will be given here.

[0083] To achieve the fixation of the first spring, such as Figure 3As shown, in some embodiments, a first protrusion 4112 is formed on the side of the top wall 411 near the inner shell 421. One end of the first spring is sleeved on the first protrusion 4112. Thus, the first protrusion 4112 can restrict the displacement of the end of the first spring near the top wall 411, so that it can better generate elastic force in the direction perpendicular to the top wall 411, and better drive the inner shell 421 to reset.

[0084] Of course, one end of the first spring can also be limited in other ways. For example, a first limiting groove can also be formed on the side of the top wall 411 near the inner shell 421. One end of the first spring can also be located in the first limiting groove. In this way, one end of the first spring can also be limited by the first limiting groove, which can also enable it to generate elastic force in the direction perpendicular to the top wall 411, and better drive the inner shell 421 to reset.

[0085] Similarly, in some embodiments, a second protrusion 4213 is formed on the side of the inner shell 421 near the top wall 411. The other end of the first spring is sleeved on the second protrusion 4213. Thus, the second protrusion 4213 can restrict the displacement of the end of the first spring near the inner shell 421, allowing it to generate a better elastic force in the direction perpendicular to the top wall 411, and better drive the inner shell 421 to return to its original position.

[0086] Alternatively, a second limiting groove can be formed on the side of the inner shell 421 near the top wall 411. The other end of the first spring can also be located in the second limiting groove. In this way, the other end of the first spring can also be limited by the second limiting groove, which can also enable it to generate elastic force in the direction perpendicular to the top wall 411, and better drive the inner shell 421 to reset.

[0087] In some embodiments, a third protrusion 4122 is formed on the side of the bottom wall 412 near the inner shell 421. One end of the second spring is sleeved on the third protrusion 4122. Thus, the third protrusion 4122 can restrict the displacement of the end of the second spring near the bottom wall 412, so that it can better generate elastic force in the direction perpendicular to the bottom wall 412, and better drive the inner shell 421 to return to its original position.

[0088] Of course, one end of the second spring can also be limited in other ways. For example, a third limiting groove can also be formed on the side of the bottom wall 412 near the inner shell 421. One end of the second spring can also be located in the third limiting groove. In this way, one end of the second spring can also be limited by the third limiting groove, which can also enable it to generate elastic force in the direction perpendicular to the bottom wall 412, and better drive the inner shell 421 to reset.

[0089] Similarly, in some embodiments, a fourth protrusion 4214 is formed on the side of the inner shell 421 near the bottom wall 412. The other end of the second spring is sleeved on the fourth protrusion 4214. Thus, the fourth protrusion 4214 can restrict the displacement of the end of the second spring near the inner shell 421, allowing it to generate a better elastic force in the direction perpendicular to the bottom wall 412, and better drive the inner shell 421 to return to its original position.

[0090] Alternatively, a fourth limiting groove can be formed on the side of the inner shell 421 near the bottom wall 412. The other end of the second spring can also be located in the fourth limiting groove. In this way, the other end of the second spring can also be limited by the fourth limiting groove, which can also enable it to generate elastic force in the direction perpendicular to the bottom wall 412, and better drive the inner shell 421 to reset.

[0091] In some embodiments, as Figure 5 As shown, the explosion-proof valve 100 may further include a sealing element 50. The sealing element 50 is sleeved on the housing 41, and a portion of the sealing element 50 is disposed opposite to a portion of the first opening 101. The sealing element 50 is used to abut against the surface of the valve body 10 where the first opening 101 is located, so as to jointly seal the first opening 101 with the housing 41. The sealing element 50 is also used to be spaced apart from a portion of the first opening 101 under air pressure, so as to open a portion of the first opening 101.

[0092] Thus, as Figure 6 As shown, Figure 6 This is a schematic diagram showing the structure when the sealing element 50 and the first opening 101 are spaced apart. When the air pressure inside the box is high, the pressure can directly drive the sealing element 50 upward, thereby opening a portion of the first opening 101. The air pressure inside the box can then quickly flow out through the first opening 101, achieving rapid pressure relief. Simultaneously, since the sealing element 50 is fitted onto the outer shell 41, once the air pressure inside the box stabilizes, the sealing element 50 can fall down along the extension direction of the outer shell 41. At this time, as... Figure 5 As shown, the seal 50 can re-cover a portion of the first opening 101 to ensure a relative air pressure seal inside the housing.

[0093] Understandably, in order to ensure that the seal 50 can produce better results, in some embodiments, the seal 50 may be made of a metal material. In this case, the seal 50 has a certain weight and needs to overcome a certain amount of gravity to be blown up, thereby avoiding the situation where the seal 50, being relatively light, would be blown up by air pressure even when there is no need to release pressure inside the housing.

[0094] To achieve a better sealing effect, such as Figure 6As shown, in some embodiments, the explosion-proof valve 100 further includes a sealing ring 60. The sealing ring 60 is disposed within the mounting cavity, on the surface of the valve body 10 where the first opening 101 is located, and surrounds the periphery of the first opening 101, for abutting against the sealing element 50. Therefore, when the sealing element 50 abuts against the sealing ring 60, the sealing effect is better achieved through the sealing ring 60. For example, the sealing ring 60 can be directly fixed to the valve body 10 by snap-fit ​​or adhesive.

[0095] In some embodiments, such as Figure 6 As shown, the explosion-proof valve 100 also includes a moisture-absorbing membrane 70, which covers the second opening 102. The valve cover 20 is located on the side of the moisture-absorbing membrane 70 away from the mounting cavity, and part of it abuts against the moisture-absorbing membrane 70. In this way, the moisture-absorbing membrane 70 can remove moisture from the air entering the enclosure, ensuring that the air inside the enclosure is dry and avoiding safety hazards caused by dampness inside the enclosure.

[0096] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An explosion-proof valve for installation on the casing of a battery pack, characterized in that, include: The valve body (10) has an internal mounting cavity and is provided with a first opening (101) and a second opening (102) communicating with the mounting cavity; the first opening (101) is used to communicate with the interior of the housing. A valve cover (20) is placed over the second opening (102) and connected to the valve body (10); an airflow channel is formed between the valve cover (20) and the valve body (10); one end of the airflow channel is connected to the second opening (102); the second opening (102) is connected to the outside through the airflow channel; A housing (41) is disposed at the first opening (101) to block the first opening (101); an adjustment cavity is formed inside the housing (41), and a first air inlet (4121) and a second air inlet (4131) communicating with the adjustment cavity are provided; the first opening (101) is connected to the adjustment cavity through the first air inlet (4121); the second air inlet (4131) is connected to the mounting cavity; and, An adjustment component (42) is disposed in the adjustment cavity; the adjustment component (42) is used to move under air pressure, so that the first air inlet (4121) and the second air inlet (4131) are connected through the adjustment cavity to adjust the air pressure inside the box. The outer casing (41) has a top wall (411), a bottom wall (412), and side walls (413) located between the top wall (411); the side walls (413) are arranged around the bottom wall (412) and together with the bottom wall (412) and the side walls (413) form the adjustment cavity; the bottom wall (412) has a first air inlet (4121); the side walls (413) have a plurality of second air inlets (4131). The adjustment component (42) includes: The inner shell (421) has its outer peripheral wall abutting against the side wall (413); The inner shell (421) forms a communicating cavity inside; a first communicating port (4211) is provided on the side of the inner shell (421) near the bottom wall (412); a second communicating port (4212) communicating with the communicating cavity is provided on the outer peripheral wall of the inner shell (421); and, The first elastic element (422) is located between the top wall (411) and the inner shell (421), with one end connected to the top wall (411) and the other end connected to the inner shell (421); or, the first elastic element (422) is located between the bottom wall (412) and the inner shell (421), with one end connected to the bottom wall (412) and the other end connected to the inner shell (421).

2. The explosion-proof valve according to claim 1, characterized in that, The plurality of second air inlets (4131) include a first sub-air inlet (4132) and a second sub-air inlet (4133); the first sub-air inlet (4132) and the second sub-air inlet (4133) are arranged in a direction perpendicular to the bottom wall (412); the top wall (411) is provided with a third air inlet.

3. The explosion-proof valve according to claim 2, characterized in that, The number of the first sub-inlet (4132) and the second sub-inlet (4133) are both multiple; the multiple first sub-inlet (4132) are arranged at intervals along the circumference of the side wall (413); the second sub-inlet (4133) are arranged at intervals along the circumference of the side wall (413); The number of the second communication ports (4212) is multiple; the multiple second communication ports (4212) are arranged circumferentially along the outer peripheral wall of the inner shell (421) and are respectively arranged opposite to the multiple first sub-air inlets (4132) and also respectively arranged opposite to the multiple second sub-air inlets (4133).

4. The explosion-proof valve according to claim 2, characterized in that, The first elastic element (422) is located between the top wall (411) and the inner shell (421), with one end connected to the top wall (411) and the other end connected to the inner shell (421); The adjustment component (42) further includes: The second elastic element (423) is located between the bottom wall (412) and the inner shell (421), with one end connected to the bottom wall (412) and the other end connected to the inner shell (421).

5. The explosion-proof valve according to claim 4, characterized in that, The first elastic element (422) includes a first spring; and / or, the second elastic element (423) includes a second spring.

6. The explosion-proof valve according to claim 5, characterized in that, The first elastic element (422) includes a first spring; A first protrusion (4112) is formed on the side of the top wall (411) near the inner shell (421), and one end of the first spring is sleeved on the first protrusion (4112); and / or, a second protrusion (4213) is formed on the side of the inner shell (421) near the top wall (411); and the other end of the first spring is sleeved on the second protrusion (4213); And / or, The second elastic element (423) includes a second spring; A third protrusion (4122) is formed on the side of the bottom wall (412) near the inner shell (421), and one end of the second spring is sleeved on the third protrusion (4122); and / or, a fourth protrusion (4214) is formed on the side of the inner shell (421) near the bottom wall (412); and the other end of the second spring is sleeved on the fourth protrusion (4214).

7. The explosion-proof valve according to claim 1, characterized in that, The explosion-proof valve (100) also includes: A sealing element (50) is fitted onto the outer shell (41), and a portion of the sealing element (50) is disposed opposite to a portion of the first opening (101); the sealing element (50) is used to abut against the surface of the valve body (10) where the first opening (101) is provided, so as to jointly seal the first opening (101) with the outer shell (41); the sealing element (50) is also used to be spaced apart from a portion of the first opening (101) under air pressure, so as to open a portion of the first opening (101).

8. The explosion-proof valve according to claim 7, characterized in that, The explosion-proof valve (100) also includes: A sealing ring (60) is disposed in the mounting cavity and on the surface of the valve body (10) where the first opening (101) is located. The sealing ring (60) is disposed around the periphery of the first opening (101) and is used to abut against the sealing element (50).

9. The explosion-proof valve according to any one of claims 1-8, characterized in that, The explosion-proof valve (100) also includes: A moisture-absorbing membrane (70) covers the second opening (102); the valve cover (20) is located on the side of the moisture-absorbing membrane (70) away from the mounting cavity, and a portion of it abuts against the moisture-absorbing membrane (70).

10. The explosion-proof valve according to claim 1, characterized in that, The valve cover (20) includes: A top cover (21) is provided over the second opening (102); and, A side cover (22) is provided around the top cover (21) and connected to the top cover (21); the side cover (22) is sleeved on the periphery of the valve body (10); The valve body (10) has a plurality of limiting portions (103) at one end near the valve cover (20); the side cover (22) has a plurality of hooks (221) at one end away from the top cover (21), the hooks (221) being located on the side of the limiting portion (103) away from the top cover (21); a part of the side cover (22) and the top cover (21) have a gap with the valve body (10) to form the airflow channel.

11. A battery pack, characterized in that, Includes the explosion-proof valve (100) according to any one of claims 1-10.

12. A vehicle, characterized in that, Includes the battery pack as described in claim 11.

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