Explosion-proof valve, battery pack and vehicle

Abstract

The invention provides an anti-explosion valve, a battery pack and a vehicle, relates to the technical field of battery explosion prevention, and aims at solving the problems that an existing anti-explosion valve is low in internal structure integration level and inconvenient to disassemble and assemble. The anti-explosion valve comprises a valve body, a valve cover, a shell and an adjusting assembly. A mounting cavity is formed in the valve body, and a first opening and a second opening which are communicated with the mounting cavity are formed in the valve body. The first opening is used for communicating with the interior of the box body. And the valve cover covers the second opening and is connected with the valve body. An airflow channel is formed between the valve deck 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 shell is arranged at the first opening and blocks the first opening. An adjusting cavity is formed in the shell, and a first air inlet and a second air inlet which are communicated with the adjusting cavity are formed in the shell. The adjusting assembly is arranged in the adjusting cavity. The explosion-proof valve is high in integration level, and parts in the valve body are more convenient to disassemble and assemble.

Description

Technical Field

[0001] The present application relates to the technical field of battery explosion-proof, and in particular to an explosion-proof valve, a battery pack and a vehicle. Background Art

[0002] With the improvement of people's living standards, cars have gradually become a necessary means of transportation for most families. Among them, electric vehicles have gradually occupied the main automobile market with their advantages such as no pollution and energy saving. Among them, the battery pack is an important part of electric vehicles and can provide energy source for electric vehicles.

[0003] A battery pack generally includes a box body and a battery pack disposed inside the box body. Among them, the battery pack may cause gas expansion inside the box body during use, making the air pressure inside the box body unbalanced with the external air pressure. Therefore, an explosion-proof valve is generally provided on the box body to prevent the box body from exploding due to excessive expansion inside the box body. CN114530668B discloses an explosion-proof valve, which includes a piston, a valve body, a spring, and a two-way constant-pressure air valve. The piston passes through the middle of the valve body and is fitted with a spring. The lower end is threadedly connected to the two-way constant-pressure air valve. A protective cover is installed on the valve body around the spring and the outer side of the two-way constant-pressure air valve. A gap is left between the protective cover and the valve body, and the end of the protective cover away from the valve body is a sealed end. CN218783185U discloses a battery pack, including an explosion-proof valve, which includes: a valve body, which is installed on a box body; a dehumidification device, which is installed in the part of the valve body located outside the box body; an upper cover, which is installed on one end of the valve body located outside the box body; and a transparent plate, which is installed on the upper cover, and the dehumidification device can be viewed through the transparent plate.

[0004] However, the various components of the above explosion-proof valve are directly arranged inside the valve body, and the integration is low, which makes it inconvenient to install and disassemble the components inside the valve body. Summary of the invention

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

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] On the one hand, an embodiment of the present application provides an explosion-proof valve for installation on a box body of a battery pack, the explosion-proof valve comprising a valve body, a valve cover, a shell and an adjustment 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 is used to communicate with the interior of the box body. The valve cover is provided at the second opening and is connected to the valve body. An air flow channel is formed between the valve cover and the valve body. One end of the air flow channel is communicated with the second opening. The second opening is communicated with the outside through the air flow channel. The shell is provided at the first opening to block the first opening. An adjustment cavity is formed inside the shell, and a first air inlet and a second air inlet communicating with the adjustment cavity are provided. The first opening is communicated with the adjustment cavity through the first air inlet, and the second air inlet is communicated with the installation cavity. The adjustment assembly is provided in the adjustment cavity, and is used to move under the action of air pressure, so that the first air inlet and the second air inlet are communicated through the adjustment cavity to adjust the air pressure in the box body.

[0008] According to the above technical means, the explosion-proof valve provided in the embodiment of the present application, the installation cavity inside the valve body can form an installation space, providing an installation space for the shell and the adjustment component. Because the valve body is provided with a first opening and a second opening connected to the installation cavity. At the same time, one end of the airflow channel formed between the valve body and the valve cover is connected to the second opening. In this way, when the first opening is connected to the inside of the box, the gas inside the box can enter the installation cavity through the first opening and flow out of the installation cavity from the airflow channel. On the contrary, the external gas can also flow into the installation cavity through the airflow channel and flow into the inside of the box from the first opening. Because the shell is provided with a first air inlet and a second air inlet connected to the adjustment cavity, and the first opening can be connected to the adjustment cavity through the first air inlet. In this way, when the air pressure inside the box and the external air pressure reach a certain threshold, the adjustment component can control the first air inlet and the second air inlet to be connected through the adjustment cavity, and the gas inside the box can enter the adjustment cavity through the second opening through the first air inlet, and finally flow into the installation cavity through the second air inlet, and flow out of the installation cavity. Because the adjustment component provided in the embodiment of the present application is located inside the shell. In this way, when installing and disassembling, it is only necessary to install the outer shell inside the valve body, and there is no need to install it inside the box separately. The degree of integration is better, and installation and disassembly are more convenient.

[0009] In a possible embodiment, the outer shell has a top wall, a bottom wall and a side wall between the top wall and the bottom wall. The side wall is arranged around the bottom wall and forms an adjustment cavity with the top wall and the side wall. The bottom wall is provided with a first air inlet. The side wall is provided with a plurality of second air inlets, and the top wall is provided with 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 component includes an inner shell and a first elastic member. The outer peripheral wall of the inner shell abuts against the side wall, and a connecting cavity is formed inside. A first connecting port is provided on a side of the inner shell close to the bottom wall. A second connecting port connected to the connecting cavity is provided on the outer peripheral wall of the inner shell. The first elastic member is located between the top wall and the inner shell, one end of which is connected to the top wall, and the other end of which is connected to the inner shell. Alternatively, the first elastic member is located between the bottom wall and the inner shell, one end of which is connected to the bottom wall, and the other end of which is connected to the inner shell.

[0010] According to the above technical means, when the air pressure in the box is relatively large, the air pressure in the box can drive the inner shell to move toward the direction close to the top wall, thereby driving the first elastic member to produce elastic deformation. At this time, the second connecting port can be arranged relative to the second sub-air inlet. In this way, the gas inside the box can enter the connecting cavity through the first connecting port. At this time, the gas in the connecting cavity can enter the installation cavity through the second connecting port and the second sub-air inlet, and finally flow out to the outside of the valve body to achieve pressure relief. On the contrary, when the external air pressure is greater than the air pressure in the box, the external gas can enter the regulating cavity through the third air inlet, and push the inner shell to move toward the direction close to the bottom wall, so that the first elastic member produces elastic deformation. At this time, the external gas can enter the connecting cavity through the second sub-air inlet and the second connecting port, and after passing through the first connecting port and the first air inlet in turn, enter the interior of the box through the first opening to achieve pressurization of the internal box.

[0011] In a possible embodiment, the number of the first sub-inlet and the second sub-inlet are both multiple. The multiple first sub-inlets are arranged at intervals along the circumference of the side wall. The second sub-inlets are arranged at intervals along the circumference of the side wall. The number of the second communication ports is multiple. The multiple second communication ports are arranged at intervals along the circumference of the outer peripheral wall of the inner shell, and are used to be arranged opposite to the multiple first sub-inlets respectively, and are also used to be arranged opposite to the multiple second sub-inlets respectively.

[0012] According to the above technical means, by setting up multiple second connecting ports, the gas transmission efficiency can be improved, thereby making the pressure relief effect of the explosion-proof valve better and faster, and being able to better cope with the sudden increase in pressure that may occur in the box, ensuring the stability of the gas pressure in the box.

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

[0014] According to the above technical means, the inner shell can be limited by the second elastic members on both sides, so that the limiting effect of the inner shell is better. When the air pressure inside the box is within the normal range, the second connecting port and the first sub-inlet and the second sub-inlet are staggered. At this time, the first elastic member and the second elastic member are used to limit the inner shell, and the force required to move the inner shell is relatively large, so that it can move more stably.

[0015] In a possible implementation manner, the first elastic member includes a first spring.

[0016] According to the above technical means, the first spring can generate compressive elastic deformation and tensile elastic deformation, so that when the inner shell reciprocates in the outer shell, the first spring can generate elastic force to pull the inner shell to reset.

[0017] In a possible implementation manner, the second elastic member includes a second spring.

[0018] According to the above technical means, the second spring can also generate compressive elastic deformation and tensile elastic deformation, so that when the inner shell moves back and forth in the outer shell, the second spring can generate elastic force to pull the inner shell to reset.

[0019] In a possible implementation manner, a first protrusion is formed on one side of the top wall close to the inner shell, and one end of the first spring is sleeved on the first protrusion.

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

[0021] In a possible implementation manner, a second protrusion is formed on one side of the inner shell close to the top wall, and the other end of the first spring is sleeved on the second protrusion.

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

[0023] In a possible implementation manner, a third protrusion is formed on one side of the bottom wall close to the inner shell, and one end of the second spring is sleeved on the third protrusion.

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

[0025] In a possible implementation manner, a fourth protrusion is formed on one side of the inner shell close to the bottom wall, and the other end of the second spring is sleeved on the fourth protrusion.

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

[0027] In a possible implementation, the explosion-proof valve further includes a sealing member. The sealing member is sleeved on the housing, and a portion of the sealing member is disposed opposite to a portion of the first opening. The sealing member is used to abut against a surface of the valve body having the first opening, so as to seal the first opening together with the housing. The sealing member is also used to be spaced apart from a portion of the first opening under the action of air pressure, so as to open a portion of the first opening.

[0028] According to the above technical means, when the air pressure inside the box is relatively high, the pressure can directly drive the seal to move upward, so that a part of the first opening is opened, and the air pressure inside the box can quickly flow out through the first opening to achieve rapid pressure relief. At the same time, since the seal is sleeved on the outer shell, when the air pressure inside the box is stable, the seal can fall along the extension direction of the outer shell. At this time, the seal can cover a part of the first opening again to ensure that the air pressure inside the box is relatively sealed.

[0029] In a possible implementation, the explosion-proof valve further includes a sealing ring. The sealing ring is arranged in the installation cavity, on the surface of the valve body with the first opening, and around the periphery of the first opening to abut against the sealing member.

[0030] According to the above technical means, when the sealing member abuts against the sealing ring, better sealing can be performed through the sealing ring, and the sealing effect is better.

[0031] In a possible implementation, the explosion-proof valve further comprises a hygroscopic membrane, which covers the second opening. The valve cover is located on a side of the hygroscopic membrane away from the installation cavity, and a part of the valve cover abuts against the hygroscopic membrane.

[0032] According to the above technical means, the moisture in the air entering the box can be removed through the hygroscopic film, ensuring that the air inside the box is dry, avoiding safety hazards caused by moisture inside the box.

[0033] In a possible embodiment, the valve cover includes a top cover and a side cover. The top cover is arranged at the second opening. The side cover is arranged around the top cover and connected to the top cover. The side cover is sleeved on the periphery of the valve body. A plurality of limit parts are formed at one end of the valve body close to the valve cover. A plurality of hooks are formed at one end of the side cover away from the top cover. The hooks are located on the side of the limit part away from the top cover, and a part of the side cover and the top cover have a gap with the valve body to form an air flow channel.

[0034] According to the above technical means, through the cooperation between the multiple hooks and the limiting parts, the valve cover and the valve body can be mutually engaged, so as to realize the mutual connection between the valve body and the valve cover. At the same time, a part of the side cover and the top cover have a gap with the valve body to form an airflow channel. In this way, the airflow can flow along the airflow channel formed by the gap between the side cover, the top cover and the valve body.

[0035] On the other hand, an embodiment of the present application provides a battery pack, comprising the explosion-proof valve described in any one of the above aspects.

[0036] Since the battery pack provided in the embodiment of the present 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, which will not be repeated here.

[0037] On the other hand, an embodiment of the present application provides a vehicle, including the battery pack in the above aspect.

[0038] Since the vehicle provided in the embodiment of the present 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, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of the structure of an explosion-proof valve provided in an embodiment of the present application;

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

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

[0042] Figure 4 is a cross-sectional view when the second communication port is connected to the second sub-inlet port;

[0043] Figure 5 is a structural schematic diagram when the second connecting port is connected to the first sub-inlet;

[0044] Figure 6 It is a schematic diagram of the structure when the sealing member and the first opening are spaced apart. Description of the drawings:

[0046] 100-explosion-proof valve; 10-valve body; 101-first opening; 102-second opening; 103-limiting portion; 104-abutting portion; 20-valve cover; 21-top cover; 22-side cover; 221-hooking hook; 30-valve body sealing ring; 40-pressure regulating device; 41-housing; 411-top wall; 4111-third air inlet; 4112-first protruding portion; 412-bottom wall; 4121-first air inlet; 4122 -third raised portion; 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 raised portion; 4214-fourth raised portion; 422-first elastic member; 423-second elastic member; 50-sealing member; 60-sealing ring; 70-hygroscopic film. DETAILED DESCRIPTION

[0047] In order to enable ordinary persons in the art to better understand the technical solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0048] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached 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 for people. Among them, the battery pack, as the main component of electric vehicles, plays the role of providing power source for electric vehicles, and the safety of the battery pack is also an issue that needs to be focused on in electric vehicles.

[0050] The battery pack generally includes a box and batteries arranged in the box. Since the batteries in the box release a large amount of heat during the charging and discharging process, the gas in the box expands, causing the air pressure inside the box to increase. For this reason, the battery pack generally also includes an explosion-proof valve, which is installed on the box. When the battery in the box has abnormal conditions such as thermal runaway, it can quickly release pressure, thereby releasing the pressure inside the box and avoiding serious safety accidents such as explosions and fires.

[0051] In the related art, a plurality of parts are arranged in the valve body of the explosion-proof valve to realize the pressure regulating function of the explosion-proof valve. However, since the plurality of parts are directly arranged in the valve body of the explosion-proof valve, when installing and disassembling, the plurality of parts need to be installed and disassembled in the valve body respectively, the degree of integration is low, and the installation and disassembly are troublesome.

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

[0053] The vehicle body may include a vehicle frame, vehicle doors, and vehicle windows. The vehicle frame may form the overall shape of the vehicle exterior and form a seating space for accommodating passengers. The vehicle doors may be rotatably connected to the vehicle frame and may open or close the interior passenger space. The vehicle windows may be installed on the vehicle doors or the vehicle frame to facilitate passengers to observe the external environment.

[0054] The chassis may include components such as a transmission system and a drive system. The drive system can drive the wheels to rotate. Depending on the drive mode of the drive system, the drive system can be divided into front-wheel drive, rear-wheel drive, and four-wheel drive arrangements. The transmission system can transfer the power generated by the engine to the wheels.

[0055] The power system can provide power for the vehicle so that the vehicle can complete basic driving functions. Depending on the type of vehicle, the composition of the power system is also different. Exemplarily, when the vehicle is an electric vehicle, the power system may include an electric motor.

[0056] In order to power electrical components such as motors, the vehicle provided in the embodiments of the present application further includes a battery system. The battery system may include a battery pack, which may be used to provide electrical energy. The battery pack may be electrically connected to the electrical components of the vehicle. In this way, the electrical energy of the battery pack may be transferred to the electrical components of the vehicle for powering.

[0057] The battery pack provided in the embodiment of the present application may include a box and a battery pack disposed in the box. The battery pack may provide a power source and be electrically connected to other electrical components of the vehicle to provide electrical energy to other components. An installation space may be formed inside the box, and the battery pack may be installed inside the box. At the same time, the box may also provide a certain degree of protection for the battery pack.

[0058] It is known that the battery pack will generate a lot of heat when charging and discharging, which will cause the air pressure inside the box to increase to a certain extent. Therefore, in order to avoid the accidental explosion caused by excessive air pressure in the box, the battery pack provided in the embodiment of the present application may also include an explosion-proof valve, which can be installed on the box. Among them, the explosion-proof valve can achieve communication between the inside and outside of the box. When the air pressure inside the box is too high, the explosion-proof valve can connect the inside of the box with the outside world, so that the gas inside the box can be released through the explosion-proof valve to balance the air pressure in the box.

[0059] The explosion-proof valve provided in the embodiment of the present application is further described below. Figure 1 As shown, Figure 1 The schematic diagram of the structure of an explosion-proof valve 100 provided in an embodiment of the present application is shown in FIG. The explosion-proof valve 100 may include a valve body 10 and a valve cover 20. The valve body 10 may be connected to the box of the battery pack to achieve fixation between the explosion-proof valve 100 and the box. For example, Figure 1 As shown, the valve body 10 can be a roughly columnar structure, and the outer wall of the valve body 10 can be formed with an external thread. Correspondingly, a connecting hole can be formed on the box, and the inner wall of the connecting hole is formed with an internal thread. In this way, the threaded connection between the valve body 10 and the box can be achieved through the external thread on the valve body 10 and the internal thread of the connecting hole on the box, and then the explosion-proof valve 100 can be installed on the box. It can be understood that in order to allow the gas inside the box to flow out through the explosion-proof valve 100. The connecting hole on the box can be connected to the inside of the box.

[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 the present application. A mounting cavity may be formed inside the valve body 10, and a first opening 101 and a second opening 102 communicating with the mounting cavity are provided. The first opening 101 may communicate with the interior of the box. In this way, the gas inside the box of the battery pack may enter the mounting cavity through the first opening 101. At the same time, Figure 2 As shown, the valve cover 20 is covered at 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 can be connected to the outside through the airflow channel. As a result, the gas in the installation cavity can flow out through the airflow channel, thereby achieving the effect of discharging the gas in the battery pack box.

[0061] In order to achieve the connection between the valve body 10 and the valve cover 20, in some embodiments, as Figure 2As shown, the valve cover 20 may include a top cover 21 and a side cover 22. The top cover 21 is covered at the second opening 102. The side cover 22 is arranged around the top cover 21 and connected to the top cover 21, and the side cover 22 is sleeved on the periphery of the valve body 10. Among them, a plurality of limit portions 103 may be formed at one end of the valve body 10 close to the valve cover 20. A plurality of hooks 221 may be formed at one end of the side cover 22 away from the top cover 21. The hooks 221 are located on the side of the limit portion 103 away from the top cover 21. Thus, as shown in FIG. Figure 2 As shown, through the mutual cooperation of the multiple hooks 221 and the limiting portion 103 , the valve cover 20 and the valve body 10 can be mutually engaged together to achieve mutual connection between the valve body 10 and the valve cover 20 .

[0062] At the same time, a part of the side cover 22 and the top cover 21 have a gap with the valve body 10 to form an airflow channel. In this way, the airflow can flow along the airflow channel formed by the gaps 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 opened on the top cover 21, which can be specifically designed according to actual needs.

[0063] In some embodiments, continue to refer to Figure 2 The valve body 10 may also be provided with an abutting portion 104 on the peripheral side of one end close to the valve cover 20. The abutting portion 104 is arranged around the valve cover 20. In this way, after the valve body 10 and the box body are connected, the abutting portion 104 may abut against the surface of the box body, thereby preventing the inside of the box body from communicating with the outside through the gap between the connecting holes of the valve body 10 and the box body, thereby ensuring the sealing of the box body and the explosion-proof valve 100.

[0064] In addition, if 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 arranged 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 box body and the explosion-proof valve 100.

[0065] Continue to refer to Figure 2 In order to realize the pressure regulation function of the explosion-proof valve 100, the explosion-proof valve 100 provided in the embodiment of the present application may further include a pressure regulating device 40. The pressure regulating device 40 may be located in the installation cavity. The pressure regulating device 40 may be used to make the first opening 101 and the second opening 102 communicate with each other through the installation cavity when the air pressure inside the box body and the external air pressure reach a certain difference, so as to adjust the balance of the air pressure inside the box body. The pressure regulating device 40 may also be used to make the first opening 101 and the second opening 102 not communicate with each other, so as to ensure the sealing performance inside the box body.

[0066] In some embodiments, Figure 3 As shown, Figure 3 The cross-sectional view of a pressure regulating device 40 provided in an embodiment of the present application, the pressure regulating device 40 may include a housing 41 and a regulating assembly 42. The housing 41 forms a regulating cavity inside, 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 ) is connected to the regulating cavity through the first air inlet 4121, and the second air inlet 4131 is connected to the installation cavity. Thus, the first opening 101 is connected to the regulating cavity through the first air inlet 4121, and the second air inlet 4131 is connected to the installation cavity, so that the first opening 101 can be connected to the installation cavity.

[0067] The regulating component 42 is disposed in the regulating cavity, and is used to move under the action of air pressure, so that the first air inlet 4121 and the second air inlet 4131 are connected through the regulating cavity, so as to adjust the air pressure in the box. Therefore, when the air pressure inside the box 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 be connected through the regulating cavity, and the gas inside the box can enter the regulating cavity through the second opening 102 and the first air inlet 4121, and finally flow into the installation cavity through the second air inlet 4131, and flow out of the installation cavity.

[0068] Thus, in the explosion-proof valve 100 provided in the embodiment of the present application, the installation cavity inside the valve body 10 can form an installation space, providing installation space for the housing 41 and the adjustment component 42. Since the valve body 10 is provided with a first opening 101 and a second opening 102 that are connected to the installation cavity. At the same time, one end of the airflow channel formed between the valve body 10 and the valve cover 20 is connected to the second opening 102. In this way, when the first opening 101 is connected to the interior of the box, the gas inside the box can enter the installation cavity through the first opening 101 and flow out of the installation cavity from the airflow channel. On the contrary, the external gas can also flow into the installation cavity through the airflow channel and flow into the interior of the box from the first opening 101. Since the housing 41 is provided with a first air inlet 4121 and a second air inlet 4131 that are connected to the adjustment cavity, and the first opening 101 can be connected to the adjustment cavity through the first air inlet 4121. In this way, when the air pressure inside the box 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 be connected through the regulating cavity, and the gas inside the box can enter the regulating cavity through the second opening 102 through the first air inlet 4121, and finally flow into the installation cavity through the second air inlet 4131, and flow out of the installation cavity. Since the regulating component 42 provided in the embodiment of the present application is located inside the shell 41. In this way, when installing and disassembling, it is only necessary to install the shell 41 inside the valve body 10, and there is no need to install them separately inside the box, which has a better degree of integration and is more convenient for installation and disassembly.

[0069] In some embodiments, Figure 3 As shown, the housing 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, and forms a regulating cavity with the top wall 411 and the side wall 413. The bottom wall 412 is provided with a first air inlet 4121. The side wall 413 is provided with a plurality of second air inlets 4131, and the top wall 411 is provided with a third air inlet 4111. Among them, 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] At the same time, the adjustment component 42 includes an inner shell 421 and a first elastic member 422. The outer peripheral wall of the inner shell 421 abuts against the side wall 413, and a connecting cavity is formed inside. A first connecting port 4211 is provided on the side of the inner shell 421 close to the bottom wall 412. A second connecting port 4212 connected to the connecting cavity is provided on the outer peripheral wall of the inner shell 421. Thus, when the second connecting 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 be connected to each other through the connecting cavity. At this time, the inside of the box can be connected to the outside. When the second connecting port 4212 on the outer peripheral wall of the inner shell 421 and the second air inlet 4131 are staggered, the first air inlet 4121 and the second air inlet 4131 are blocked from each other by the side wall 413 of the inner shell 421 and cannot be connected.

[0071] like Figure 3 As shown, the first elastic member 422 is located between the top wall 411 and the inner shell 421, one end of which is connected to the top wall 411, and the other end of which is connected to the inner shell 421. Alternatively, the first elastic member 422 is located between the bottom wall 412 and the inner shell 421, one end of which is connected to the bottom wall 412, and the other end of which is connected to the inner shell 421. For example, Figure 3 As shown, the first elastic member 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, if Figure 3 As shown, when the air pressure in the box is relatively high, the air pressure in the box can drive the inner shell 421 to move toward the direction close to the top wall 411, thereby driving the first elastic member 422 to produce elastic deformation. At this time, the second connecting port 4212 can be arranged opposite to the second sub-inlet 4133. In this way, the gas inside the box can enter the connecting cavity through the first connecting port 4211. At this time, Figure 4 As shown, Figure 4 It is a cross-sectional view when the second connecting port 4212 is connected to the second sub-air inlet 4133 . The gas in the connecting cavity can enter the installation cavity through the second connecting port 4212 and the second sub-air inlet 4133 , and finally flow out to the outside of the valve body 10 to achieve pressure relief.

[0073] On the contrary, refer to Figure 3 When the external air pressure is greater than the air pressure inside the box, the external gas can enter the regulating chamber through the third air inlet 4111 and push the inner shell 421 to move toward the bottom wall 412, causing the first elastic member 422 to produce elastic deformation. Figure 5 As shown, Figure 5The second connecting port 4212 is a schematic diagram of the structure when the second connecting port 4212 is connected to the first sub-inlet 4132. The external gas can enter the connecting cavity through the first sub-inlet 4132 and the second connecting port 4212, and then pass through the first connecting port 4211 ( Figure 3 ) and the first air inlet 4121 ( Figure 3 ) and then enters the interior of the box through the first opening 101 to achieve pressurization of the internal box.

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

[0075] Of course, the regulating component 42 may also have other components, and the air pressure regulation may be achieved by other means, as long as the air pressure regulation can be achieved. For example, in other embodiments, the regulating component 42 may include a rotating shaft and a partition plate. Among them, the axis of the rotating shaft may be parallel to the bottom wall 412. The partition plate may be arranged 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 arranged on the bottom wall 412 and the top wall 411, respectively. In this way, when the air pressure inside the box is relatively stable, the partition plate can separate the regulating chamber into two independent chambers above and below. When the air pressure drives the partition plate to rotate, the two chambers are connected to each other, so that the connection between the first air inlet 4121 and the second air inlet 4131 can be achieved, thereby achieving the regulation of air pressure.

[0076] based on Figure 3 The scheme shown, such as Figure 3 As shown, in some embodiments, the number of the first sub-air inlet 4132 and the second sub-air inlet 4133 are both multiple. The multiple first sub-air inlets 4132 are arranged at intervals along the circumference of the side wall 413. The second sub-air inlet 4133 is arranged at intervals along the circumference of the side wall 413. The number of the second connecting ports 4212 is multiple. The multiple second connecting ports 4212 are arranged at intervals along the circumference of the outer peripheral wall of the inner shell 421, and are used to be arranged opposite to the multiple first sub-air inlets 4132, and are also used to be arranged opposite to the multiple second sub-air inlets 4133. Therefore, by setting multiple second connecting ports 4212, the gas transmission efficiency can be improved, thereby making the pressure relief effect of the explosion-proof valve 100 better and faster, and can better cope with the sudden rise that may occur in the box body, and ensure the stability of the air pressure in the box body.

[0077] Of course, in 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 sizes of the first sub-inlet 4132, the second sub-inlet 4133 and the second connecting port 4212 can be designed to be relatively large, and the pressure relief effect of the explosion-proof valve 100 can also be guaranteed.

[0078] In some embodiments, Figure 3 As shown, the adjustment component 42 may also include a second elastic member 423. The second elastic member 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. At this time, the inner shell 421 can be limited by the second elastic members 423 on both sides, so that the limiting effect of the inner shell 421 is better. When the air pressure inside the box is within a normal range, the second connecting port 4212 and the first sub-air inlet 4132 and the second sub-air inlet 4133 are staggered with each other. At this time, the first elastic member 422 and the second elastic member 423 are used to limit the inner shell 421, and the force required to move the inner shell 421 is relatively large, so that it can move more stably.

[0079] It can be understood that the elastic force of the first elastic member 422 and the second elastic member 423 can be designed according to actual needs, so that the air pressure value inside the box body corresponding to the force required when the second connecting port 4212 of the inner shell 421 moves to connect with the first sub-air inlet 4132 or the second sub-air inlet 4133 is within a critical range, so as to avoid the situation where the internal pressure value of the box body is too large and cannot push the second connecting port 4212 of the inner shell 421 to be arranged relative to the first sub-air inlet 4132 or the second sub-air inlet 4133.

[0080] In a possible implementation, the first elastic member 422 may include a first spring that can generate compression elastic deformation and tension elastic deformation, so that when the inner shell 421 reciprocates in the outer shell 41, the first spring can generate elastic force to pull the inner shell 421 to reset.

[0081] Similarly, in some embodiments, the second elastic member 423 may also include a second spring. Thus, the second spring may also generate compression elastic deformation and tension elastic deformation, so that when the inner shell 421 reciprocates in the outer shell 41, the second spring may generate elastic force to pull the inner shell 421 to reset.

[0082] Of course, the first elastic member 422 and the second elastic member 423 may also be other components that can generate elasticity, which can be selected according to actual conditions, and no further examples are given here.

[0083] In order to fix the first spring, Figure 3As shown, in some embodiments, a first protrusion 4112 is formed on one side of the top wall 411 close to the inner shell 421. One end of the first spring is sleeved on the first protrusion 4112. Thus, the first protrusion 4112 can limit the displacement of one end of the first spring close to the top wall 411, so that it can better generate elastic force in a 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 close to 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 better generate elastic force in a 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 one side of the inner shell 421 close to the top wall 411. The other end of the first spring is sleeved on the second protrusion 4213. Thus, the second protrusion 4213 can limit the displacement of one end of the first spring close to the inner shell 421, so that it can better generate elastic force in a direction perpendicular to the top wall 411, and better drive the inner shell 421 to reset.

[0086] Alternatively, a second limiting groove may be formed on one side of the inner shell 421 close to the top wall 411. The other end of the first spring may also be located in the second limiting groove. In this way, the other end of the first spring may also be limited by the second limiting groove, so that it can better generate elastic force in a 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 one side of the bottom wall 412 close to the inner shell 421. One end of the second spring is sleeved on the third protrusion 4122. Thus, the third protrusion 4122 can limit the displacement of one end of the second spring close to the bottom wall 412, so that it can better generate elastic force in a direction perpendicular to the bottom wall 412, and better drive the inner shell 421 to reset.

[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 close to 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 better generate elastic force in a 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 one side of the inner shell 421 close to the bottom wall 412. The other end of the second spring is sleeved on the fourth protrusion 4214. Thus, the fourth protrusion 4214 can limit the displacement of one end of the second spring close to the inner shell 421, so that it can better generate elastic force in a direction perpendicular to the bottom wall 412, and better drive the inner shell 421 to reset.

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

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

[0092] In this way, Figure 6 As shown, Figure 6 The structure diagram of the seal 50 and the first opening 101 is shown in FIG. 1 . When the air pressure inside the box is high, the pressure can directly drive the seal 50 to move upward, so that a part of the first opening 101 is opened, and the air pressure inside the box can quickly flow out through the first opening 101 to achieve rapid pressure relief. At the same time, since the seal 50 is sleeved on the outer shell 41, when the air pressure inside the box is stable, the seal 50 can fall along the extension direction of the outer shell 41. At this time, Figure 5 As shown, the sealing member 50 can cover a portion of the first opening 101 again to ensure that the air pressure inside the box is relatively sealed.

[0093] It is understandable that in order to make the seal 50 produce a better effect, in some embodiments, the seal 50 can be made of metal material. In this case, the seal 50 has a certain weight and needs to overcome a certain gravity to be blown up, thereby avoiding the seal 50 being blown up by air pressure when there is no need to release the pressure inside the box due to the small weight.

[0094] In order to achieve 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 in the installation cavity, disposed on the surface of the valve body 10 having the first opening 101, and disposed around the periphery of the first opening 101, and is used to abut against the sealing member 50. Therefore, when the sealing member 50 abuts against the sealing ring 60, better sealing can be performed through the sealing ring 60, and the sealing effect is better. Exemplarily, the sealing ring 60 can be directly fixed to the valve body 10 by means of clamping or bonding.

[0095] In some embodiments, Figure 6 As shown, the explosion-proof valve 100 further includes a hygroscopic film 70, which covers the second opening 102. The valve cover 20 is located on the side of the hygroscopic film 70 away from the installation cavity, and a part of the valve cover 20 abuts against the hygroscopic film 70. In this way, the moisture of the air entering the box body can be removed through the hygroscopic film 70, so as to ensure that the air inside the box body is dry and avoid potential safety hazards caused by moisture inside the box body.

[0096] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An explosion-proof valve, used for installation on a battery pack box, characterized in that: include: A valve body (10) is formed with an installation cavity inside and is provided with a first opening (101) and a second opening (102) communicating with the installation cavity; the first opening (101) is used to communicate with the interior of the box; a valve cover (20), which is disposed at the second opening (102) and is connected to the valve body (10); an air flow channel is formed between the valve cover (20) and the valve body (10); one end of the air flow channel is in communication with the second opening (102); the second opening (102) is in communication with the outside through the air flow channel; A housing (41) is arranged at the first opening (101) to block the first opening (101); an adjusting cavity is formed inside the housing (41), and a first air inlet (4121) and a second air inlet (4131) are provided to communicate with the adjusting cavity; the first opening (101) is communicated with the adjusting cavity through the first air inlet (4121); the second air inlet (4131) is communicated with the installation cavity; and, An adjusting component (42) is arranged in the adjusting chamber; the adjusting component (42) is used to move under the action of air pressure, so that the first air inlet (4121) and the second air inlet (4131) are connected through the adjusting chamber to adjust the air pressure in the box.

2. The explosion-proof valve according to claim 1, characterized in that: The housing (41) comprises a top wall (411), a bottom wall (412), and a side wall (413) located between the top wall (411); the side wall (413) is arranged around the bottom wall (412) and forms the regulating cavity together with the bottom wall (412) and the side wall (413); the bottom wall (412) is provided with the first air inlet (4121); the side wall (413) is provided with a plurality of the second air inlets (4131); the plurality of the 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; The adjustment component (42) comprises: An inner shell (421), wherein the outer peripheral wall of the inner shell (421) abuts against the side wall (413); a communication cavity is formed inside the inner shell (421); a first communication opening (4211) is provided on a side of the inner shell (421) close to the bottom wall (412); a second communication opening (4212) communicating with the communication cavity is provided on the outer peripheral wall of the inner shell (421); and, A first elastic member (422), wherein the first elastic member (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 member (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).

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

4. The explosion-proof valve according to claim 2, characterized in that: The first elastic member (422) is located between the top wall (411) and the inner shell (421), one end of which is connected to the top wall (411) and the other end of which is connected to the inner shell (421); The adjustment component (42) also includes: The second elastic member (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 member (422) includes a first spring; and / or the second elastic member (423) includes a second spring.

6. The explosion-proof valve according to claim 5, characterized in that: The first elastic member (422) comprises a first spring; A first protrusion (4112) is formed on one side of the top wall (411) close to 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 one side of the inner shell (421) close to the top wall (411); and the other end of the first spring is sleeved on the second protrusion (4213); and / or, The second elastic member (423) comprises a second spring; A third protrusion (4122) is formed on the side of the bottom wall (412) close to 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) close to the bottom wall (412); 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) further comprises: A sealing member (50), wherein the sealing member (50) is sleeved on the outer shell (41), and a portion of the sealing member (50) is arranged opposite to a portion of the first opening (101); the sealing member (50) is used to abut against a surface of the valve body (10) having the first opening (101) so as to seal the first opening (101) together with the outer shell (41); the sealing member (50) is also used to be spaced apart from a portion of the first opening (101) under the action of 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) further comprises: A sealing ring (60) is arranged in the installation cavity, on the surface of the valve body (10) on which the first opening (101) is opened, and is arranged around the periphery of the first opening (101) to abut against the sealing member (50).

9. The explosion-proof valve according to any one of claims 1 to 8, characterized in that: The explosion-proof valve (100) further comprises: A hygroscopic film (70), the hygroscopic film (70) covers the second opening (102); the valve cover (20) is located on a side of the hygroscopic film (70) away from the installation cavity, and a part of the valve cover (20) is in contact with the hygroscopic film (70).

10. The explosion-proof valve according to claim 1, characterized in that: The valve cover (20) comprises: a top cover (21), the top cover (21) being arranged to cover the second opening (102); and A side cover (22) is arranged 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); In particular, a plurality of limiting portions (103) are formed at one end of the valve body (10) close to the valve cover (20); a plurality of hooks (221) are formed at one end of the side cover (22) away from the top cover (21), and the hooks (221) are located on a side of the limiting portion (103) away from the top cover (21); a portion of the side cover (22) and the top cover (21) have a gap with the valve body (10) to form the air flow channel.

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

12. A vehicle, characterized in that: A battery pack comprising the battery pack of claim 11.

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