Renewable anti-explosion breathable dehumidification valve and power battery pack

Abstract

The invention relates to a renewable anti-explosion breathable dehumidification valve and a power battery pack, the renewable anti-explosion breathable dehumidification valve comprises an anti-explosion breathable assembly, the anti-explosion breathable assembly comprises a valve seat with an opening in one end and a cavity formed in the valve seat, a medium pipeline communicated with the cavity is arranged at the end, away from the opening, of the valve seat, and a breathable film base for opening or closing the opening; a breathable film communicated with the cavity is arranged on the breathable film base; the dehumidification regeneration assembly comprises a water absorption core body filled in the medium pipeline, a regeneration heater is connected to the interior or the periphery of the water absorption core body, the outlet end of the medium pipeline is connected with a two-position three-way electromagnetic valve, and the two-position three-way electromagnetic valve is provided with a ventilation pipeline and a drainage pipeline. The breathable film can prevent external water and dust from entering the battery pack box body. The dehumidification regeneration assembly adsorbs moisture in the air through the water absorption core body, so that the humidity in the battery pack box body can be effectively reduced, the generation of condensation is inhibited, and the continuous long-term stable operation of the power battery pack is ensured.

Description

Technical Field

[0001] This application relates to the field of vehicle power battery pack technology, and in particular to a renewable explosion-proof ventilated dehumidifying valve and power battery pack. Background Technology

[0002] A battery pack is an energy storage unit formed by connecting multiple individual batteries through a battery management system. As a power source or storage medium for new energy electric vehicles and energy storage power stations, its applications are quite widespread. However, atmospheric environments such as high mountains, coastal areas, rainy areas, and high-humidity regions are characterized by frequent fog and high humidity, which significantly impacts its normal operation. Under such conditions, fog droplets, raindrops, and moisture can easily enter the battery pack through the vents.

[0003] Moisture and humidity from the air enter the battery pack. If the battery pack operates for extended periods in environments with significant temperature and humidity fluctuations, condensation can easily form inside, posing a threat to its performance and safe operation. Furthermore, battery packs are typically equipped with water-cooling plates to control battery temperature. When the internal temperature of the battery pack falls below the condensation temperature, condensation can easily form on the inner walls, also creating a safety hazard. Therefore, a stable and controllable dry environment is essential for ensuring the normal operation of the battery pack.

[0004] In related technologies, semiconductor dehumidification reduces air humidity by condensing moisture in the air on the cold-end surface of a semiconductor. Semiconductor dehumidification has a relatively high power, typically between 60 and 120W, and requires a complex data acquisition and control system embedded in the battery management system (BMS). Fiber humidity control sheets regulate ambient humidity by adsorbing or releasing water molecules from the air through their internal fiber materials. Individual sheets are expensive; theoretically, each sheet can regulate the humidity of a space up to 20L, but actual testing has shown that after more than 72 hours of continuous moisture exposure, the humidity control sheet becomes saturated and loses its humidity-regulating function.

[0005] Insulation with cotton reduces the temperature difference between the surface and the air, thus reducing or preventing condensation. This solution is inexpensive, but moisture is absorbed into the insulation, which has some absorbency, thus lowering its thermal resistance. Waterproof and breathable membranes utilize the high porosity and uniform pore size distribution of polytetrafluoroethylene (PTFE) microporous material to achieve breathability, dustproofing, and waterproofing. Testing revealed that while the waterproof and breathable membrane temporarily inhibits humidity growth, it does not meet long-term humidity control requirements, and essentially loses its humidity-regulating function after 6 hours of testing. External desiccant cans have a water absorption rate of 30-50%, requiring drilling holes in the battery cabinet casing for installation, and necessitate periodic replacement during their service life. Summary of the Invention

[0006] Embodiments of the present application provide a renewable explosion-proof air-permeable dehumidifying valve and a power battery pack to solve the problem that the battery pack drying scheme in the related art is difficult to keep the battery pack box body inside in a dry environment for a long time.

[0007] The first aspect of the embodiments of the present application provides a renewable explosion-proof air-permeable dehumidifying valve, which comprises: An explosion-proof air-permeable assembly, which comprises a valve seat with an open end and an internal cavity, a medium pipeline connected to the cavity and arranged at the end away from the opening, and an air-permeable membrane base for opening or closing the opening, wherein the air-permeable membrane base is provided with an air-permeable membrane connected to the cavity; A dehumidifying and regenerating assembly, which comprises a water-absorbing core filled in the medium pipeline, a regenerating heater connected to the water-absorbing core or the periphery thereof, a two-position three-way electromagnetic valve connected to the outlet end of the medium pipeline, and an air vent pipeline and a water drainage pipeline arranged on the two-position three-way electromagnetic valve.

[0008] In some embodiments: the inlet end of the medium pipeline is fixedly connected to the valve seat, a tappet connected to the air-permeable membrane base is arranged in the inlet end of the medium pipeline, and a medium channel connected to the medium pipeline and the air-permeable membrane is arranged in the tappet; A support for slidingly connecting the tappet is arranged in the cavity of the valve seat, a helical spring for elastically supporting the tappet to drive the air-permeable membrane base to close the opening is arranged on the tappet, one end of the helical spring abuts against the support, and the other end abuts against a boss at the end of the tappet.

[0009] In some embodiments: the air-permeable membrane base is provided with a sealing surface matched with the opening at one end close to the valve seat, and the opening of the valve seat is provided with a first annular sealing ring sealingly connected to the sealing surface; The air-permeable membrane base is provided with a protective face shield at one end away from the valve seat, and an air-permeable gap is arranged between the air-permeable membrane base and the protective face shield.

[0010] In some embodiments: the air-permeable membrane base and the protective face shield are both located in the opening of the valve seat, the outer diameter of the air-permeable membrane base and the protective face shield is smaller than the inner diameter of the opening, the air-permeable membrane base is provided with a positioning groove accommodating the air-permeable membrane at one end away from the valve seat, and a compression ring for compressing the air-permeable membrane in the positioning groove is fixedly connected to the protective face shield.

[0011] In some embodiments: the air-permeable membrane is a polytetrafluoroethylene membrane, and a plurality of micropores with a diameter ranging from 0.1 to 0.5 um are arranged on the air-permeable membrane.

[0012] In some embodiments: the regeneration heater comprises a heating wire wound around the outer periphery of the medium pipe or the water absorption core, and a heating wire sheath for fixing the heating wire on the outer periphery of the medium pipe or the water absorption core.

[0013] In some embodiments: the medium pipe is a metal pipe, and the medium pipe comprises a horizontal pipe and a vertical pipe forming an inverted "L" shaped elbow structure, the horizontal pipe is connected with the valve seat, the water absorption core is located in the vertical pipe, and the heating wire sheath and the heating wire are fixed on the outer periphery of the vertical pipe.

[0014] In some embodiments: the water absorption core is any one of cotton fiber, hemp fiber, seaweed fiber, polyester fiber, and polyacrylonitrile fiber.

[0015] In some embodiments: a controller is further connected between the regeneration heater and the two-position three-way electromagnetic valve, the controller controls the two-position three-way electromagnetic valve to open the air vent pipeline when the regeneration heater heats the water absorption core for regeneration, and the controller controls the two-position three-way electromagnetic valve to open the drainage pipeline when the regeneration heater stops heating the water absorption core.

[0016] The second aspect of the embodiments of the application provides a power battery pack, comprising: A battery pack box body, a pressure relief port is formed in the side wall of the battery pack box body, and the regenerable explosion-proof air-permeable and dehumidifying valve in any one of the above embodiments is arranged in the battery pack box body, the explosion-proof air-permeable assembly of the regenerable explosion-proof air-permeable and dehumidifying valve is in sealing connection with the pressure relief port, and the drainage pipeline extends out of the battery pack box body.

[0017] The technical scheme provided by the application has the beneficial effects of: The embodiments of the application provide a regenerable explosion-proof air-permeable and dehumidifying valve and a power battery pack, because the regenerable explosion-proof air-permeable and dehumidifying valve is provided with an explosion-proof air-permeable assembly, the explosion-proof air-permeable assembly comprises a valve seat with an open end and an internal cavity, a medium pipe in communication with the cavity is arranged at the end of the valve seat away from the open end, and an air-permeable film base for opening or closing the opening is arranged, and an air-permeable film in communication with the cavity is arranged on the air-permeable film base; a dehumidification and regeneration assembly, the dehumidification and regeneration assembly comprises a water absorption core filled in the medium pipe, a regeneration heater connected to the water absorption core, a two-position three-way electromagnetic valve connected to the outlet end of the medium pipe, and an air vent pipeline and a drainage pipeline of the two-position three-way electromagnetic valve.

[0018] Therefore, the application integrates the explosion-proof and breathable assembly and the dehumidification and regeneration assembly, wherein the explosion-proof and breathable assembly is provided with a breathable membrane base opening or closing an opening on the valve seat, the valve seat and the breathable membrane base together form an explosion-proof valve group, which can quickly release pressure after thermal runaway of the battery pack, avoiding explosion of the battery pack. The breathable membrane base is provided with a breathable membrane communicating with a cavity, which limits the entry of water and dust from the outside into the battery pack box. The dehumidification and regeneration assembly can effectively reduce the humidity inside the battery pack box by adsorbing water vapor in the air through the water absorption core, inhibit the generation of condensation, and realize the reversible cyclic use of the water absorption core by heating the regeneration heater to heat and regenerate, fully utilizing the moisture absorption and moisture release functions of the water absorption core. The two-position three-way electromagnetic valve can control the discharge of moisture when the water absorption core is regenerated, and balance the internal and external air pressure of the battery pack box when the water absorption core is dried and filtered, ensuring continuous and long-term stable operation of the power battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 Structure front view of the application embodiment of the regenerable explosion-proof and breathable dehumidification valve; Figure 2 Structure side view of the application embodiment of the regenerable explosion-proof and breathable dehumidification valve; Figure 3 Structure cross-sectional view of the application embodiment of the regenerable explosion-proof and breathable dehumidification valve; Figure 4 Local structure cross-sectional view of the application embodiment of the regenerable explosion-proof and breathable dehumidification valve in the air inlet state; Figure 5 Local structure cross-sectional view of the application embodiment of the regenerable explosion-proof and breathable dehumidification valve in the pressure relief state; Figure 6 Structure cross-sectional view of the application embodiment of the regenerable explosion-proof and breathable dehumidification valve in the air inlet state; Figure 7 Structure cross-sectional view of the application embodiment of the regenerable explosion-proof and breathable dehumidification valve in the regeneration state; Figure 8 Structure schematic view of the application embodiment of the power battery pack.

[0021] Reference signs: 10, explosion-proof venting assembly; 11, valve seat; 12, medium pipeline; 13, venting membrane base; 14, venting membrane; 15, tappet; 16, coil spring; 17, protective mask; 18, pressure ring; 19, first annular sealing ring; 20, dehumidification regeneration assembly; 21, water absorption core; 22, regeneration heater; 23, two-position three-way electromagnetic valve; 24, air venting pipeline; 25, water drainage pipeline; 30, battery pack box; 40, explosion-proof venting and dehumidification valve; 50, pressure relief valve. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0023] The embodiments of the present application provide an explosion-proof venting and dehumidification valve and a power battery pack, which can solve the problem that the battery pack drying scheme in the related art is difficult to keep the inside of the battery pack box in a dry environment for a long time.

[0024] Referring to Figures 1 to 7 The first aspect of the embodiments of the present application provides an explosion-proof venting and dehumidification valve, which comprises: The explosion-proof venting assembly 10 comprises a valve seat 11 with an open end and an internal cavity, a medium pipeline 12 communicating with the cavity and arranged at the end away from the open end of the valve seat 11, and a venting membrane base 13 opening or closing the opening, and a venting membrane 14 communicating with the cavity and arranged on the venting membrane base 13. The valve seat 11 and the venting membrane base 13 cooperatively form an explosion-proof valve group. In the normal operation of the power battery pack, the explosion-proof valve group is in a closed state. When the power battery pack is in a thermal runaway state, high-pressure and high-temperature smoke generated by the power battery pack will push the venting membrane base 13 to open the opening of the valve seat 11 to achieve pressure relief.

[0025] In the normal operation of the power battery pack, when the explosion-proof valve group is in the closed state, in order to prevent rainwater, dust and other impurities outside the power battery pack from entering the inside of the battery pack box 30, the venting membrane 14 communicating with the cavity is arranged on the venting membrane base 13. The gap on the venting membrane 14 can communicate the gas inside and outside the battery pack box to achieve pressure balance, and the small gap on the venting membrane 14 can filter out the rainwater, dust and other impurities outside the power battery pack, so that the inside of the battery pack box is in a dry and clean environment.

[0026] The dehumidification and regeneration assembly 20 includes a water absorption core 21 filled in the medium pipeline 12, a regeneration heater 22 connected in or outside the water absorption core 21, and a two-position three-way electromagnetic valve 23 connected at the outlet end of the medium pipeline 12. The inlet of the two-position three-way electromagnetic valve 23 is connected to the outlet of the medium pipeline 12, and the two outlets of the two-position three-way electromagnetic valve 23 are respectively provided with an air vent pipeline 24 and a water drainage pipeline 25.

[0027] Since the gap on the air permeable film 14 is small, rainwater, dust and other impurities outside the power battery pack can be filtered out, but it is difficult to block and filter the water vapor in the air. Therefore, the water absorption core 21 is filled in the medium pipeline 12 to absorb and filter the water vapor entering the battery pack box 30 from the explosion-proof air permeable assembly 10. When the water absorption core 21 is saturated, the regeneration heater 22 in or outside the water absorption core 21 is used to heat and dry the water absorption core 21 for regeneration, so that the water absorption core 21 can be recycled.

[0028] The two-position three-way electromagnetic valve 23 is connected at the outlet end of the medium pipeline 12. The two-position three-way electromagnetic valve 23 has the air vent pipeline 24 and the water drainage pipeline 25. When the regeneration heater 22 heats the water absorption core 21 for regeneration, the two-position three-way electromagnetic valve 23 opens the water drainage pipeline 25, so that the moisture in the water absorption core 21 is discharged to the outside of the battery pack box 30. When the regeneration heater 22 stops heating the water absorption core 21, the two-position three-way electromagnetic valve 23 opens the air vent pipeline 24, so that the air pressure inside and outside the battery pack box 30 is balanced.

[0029] The regenerable explosion-proof air permeable and dehumidification valve of the embodiment of the application integrates the explosion-proof air permeable assembly 10 and the dehumidification and regeneration assembly 20. The explosion-proof air permeable assembly 10 is provided with the air permeable film base 13 opening or closing the opening on the valve seat 11. The valve seat 11 and the air permeable film base 13 together form an explosion-proof valve group. The explosion-proof valve group can quickly release pressure after the power battery pack is out of control, so as to avoid explosion of the power battery pack.

[0030] The air permeable film base 13 is provided with the air permeable film 14 communicating with the cavity. The air permeable film 14 limits the water and dust outside the battery pack box 30 from entering the inside of the battery pack box 30. The dehumidification and regeneration assembly 20 absorbs the water vapor in the air through the water absorption core 21, which can effectively reduce the humidity inside the battery pack box 30 and inhibit the generation of condensation. The regeneration heater 22 heats and regenerates to realize reversible recycling of the water absorption core 21, and fully utilizes the moisture absorption and moisture release functions of the water absorption core 21.

[0031] The two-position three-way electromagnetic valve 23 can control the discharge of moisture when the water absorption core 21 is regenerated, and balance the air pressure inside and outside the battery pack box 30 when the water absorption core 21 is dried and filtered. When the regeneration heater 22 heats the water absorption core 21 for regeneration, the two-position three-way electromagnetic valve 23 opens the water drainage pipeline 25, so that the moisture in the water absorption core 21 is discharged to the outside of the battery pack box 30.

[0032] In some optional embodiments, referring to Figures 1 to 7 The application provides a renewable explosion-proof air-permeable dehumidifying valve. The inlet end of the medium pipeline 12 is fixedly connected with the valve seat 11. The inlet end of the medium pipeline 12 is provided with a tappet 15 connected with the air-permeable membrane base 13. The tappet 15 is provided with a medium channel communicating the medium pipeline 12 and the air-permeable membrane 14.

[0033] The cavity of the valve seat 11 is provided with a support slidingly connecting the tappet 15. The support provides support and guidance for the linear movement of the tappet 15 in the medium pipeline 12 and the valve seat 11. A helical spring 16 is sleeved on the tappet 15 to elastically support the tappet 15 to drive the air-permeable membrane base 13 to close the opening. One end of the helical spring 16 abuts against the support, and the other end of the helical spring 16 abuts against the boss at the end of the tappet 15.

[0034] In order to realize that the valve seat 11 and the air-permeable membrane base 13 jointly form an explosion-proof valve group which remains closed in the normal state of the power battery pack and can be opened for pressure relief in the thermal runaway state, the application provides that the inlet end of the medium pipeline 12 is provided with the tappet 15 connected with the air-permeable membrane base 13, the cavity of the valve seat 11 is provided with the support slidingly connecting the tappet 15, and the helical spring 16 is sleeved on the tappet 15 to elastically support the tappet 15 to drive the air-permeable membrane base 13 to close the opening of the valve seat 11.

[0035] The helical spring 16 is used for elastically supporting the tappet 15 to drive the air-permeable membrane base 13 to close the opening of the valve seat 11. The air outside the battery pack box 30 and the air inside the battery pack box 30 are communicated with each other through the medium channel in the tappet 15 and the air-permeable membrane 14, thereby balancing the pressure difference between the inside and outside of the battery pack box 30.

[0036] When the power battery pack is in thermal runaway, a large amount of high-temperature and high-pressure flue gas is released to push the tappet 15 and the air-permeable membrane base 13 to move outward, thereby changing the helical spring 16 from the expanded state to the compressed state to provide a pressure relief channel for the air-permeable membrane base 13 to open the opening of the valve seat 11. After the pressure relief is completed, the helical spring 16 automatically changes from the compressed state to the expanded state to push the air-permeable membrane base 13 to close the opening of the valve seat 11 again.

[0037] In some optional embodiments, referring to Figure 4 and Figure 5As shown, the application provides a renewable explosion-proof breathable dehumidifying valve. The breathable membrane base 13 of the explosion-proof breathable dehumidifying valve 40 is provided with a sealing surface that is adapted to the opening of the valve seat 11 at one end close to the valve seat 11. The sealing surface is a smooth annular plane. The opening of the valve seat 11 is provided with a first annular sealing ring 19 that sealingly connects the sealing surface. The end of the breathable membrane base 13 away from the valve seat 11 is provided with a protective mask 17. The protective mask 17 and the breathable membrane base 13 are provided with a breathable gap therebetween.

[0038] The application provides a sealing surface at one end of the breathable membrane base 13 close to the valve seat 11 that is adapted to the opening of the valve seat 11. The opening of the valve seat 11 is provided with a first annular sealing ring 19 that sealingly connects the sealing surface. When the breathable membrane base 13 is close to the valve seat 11, the sealing surface and the first annular sealing ring 19 sealingly block the gap between the breathable membrane base 13 and the valve seat 11. Thus, the air outside the battery pack box 30 and the air inside the battery pack box 30 can only communicate with each other through the medium channel in the tappet 15 and the breathable membrane 14.

[0039] Since the breathable membrane base 13 is exposed to the outside of the battery pack box 30, in order to protect the breathable membrane 14 from being damaged, the end of the breathable membrane base 13 away from the valve seat 11 is provided with a protective mask 17. The protective mask 17 covers the breathable membrane 14 and is provided with a breathable gap with the breathable membrane base 13. Thus, the breathable membrane 14 can normally breathe.

[0040] In some optional embodiments, referring to Figure 4 and Figure 5 As shown, the application provides a renewable explosion-proof breathable dehumidifying valve. The breathable membrane base 13 of the explosion-proof breathable dehumidifying valve 40 and the protective mask 17 are both located in the opening of the valve seat 11. The outer diameter of the breathable membrane base 13 and the protective mask 17 is smaller than the inner diameter of the opening. The end of the breathable membrane base 13 away from the valve seat 11 is provided with a positioning groove that accommodates the breathable membrane 14 and a compression ring 18 that compresses the breathable membrane 14 in the positioning groove. The compression ring 18 is fixedly connected with the protective mask 17.

[0041] The breathable membrane base 13 and the protective mask 17 of the explosion-proof breathable dehumidifying valve 40 are both located in the opening of the valve seat 11. The outer diameter of the breathable membrane base 13 and the protective mask 17 is smaller than the inner diameter of the opening. Thus, the external gas needs to first enter the gap formed by the breathable membrane base 13, the protective mask 17 and the opening, and then enter the gap between the breathable membrane base 13 and the protective mask 17, and finally enter the breathable membrane 14. Thus, the flow path of the gas flow is lengthened and bent, and the rainwater or impurities in the external environment are blocked outside.

[0042] In some optional embodiments, referring to Figure 4 and Figure 5As shown, the application provides a renewable explosion-proof breathable dehumidifying valve. The breathable membrane 14 of the explosion-proof breathable dehumidifying valve 40 is preferably but not limited to a polytetrafluoroethylene membrane. The breathable membrane 14 is provided with a plurality of micropores with a diameter ranging from 0.1 to 0.5 um.

[0043] The breathable membrane 14 of the application is preferably but not limited to a polytetrafluoroethylene membrane. The breathable membrane 14 is provided with a plurality of micropores with a diameter ranging from 0.1 to 0.5 um. The smallest diameter of rainwater is 20 um, the diameter of drizzle is 400 um, and the diameter of dust is between 0.1 and 100 um. That is, the polytetrafluoroethylene membrane can prevent water and dust from entering the battery pack box 30.

[0044] In addition, the surface of the polytetrafluoroethylene membrane is not easy to stick water, and has strong hydrophobicity, which ensures that water and dust are not easy to adhere to the breathable membrane 14. When the external pressure of the battery pack box 30 is greater than the internal pressure of the battery pack box 30, air enters the battery pack box 30 through the protective mask 17, the breathable membrane 14, and the medium channel of the tappet 15 in turn.

[0045] In some optional embodiments, as shown in Figure 4 and Figure 5 The application provides a renewable explosion-proof breathable dehumidifying valve. The regeneration heater 22 of the explosion-proof breathable dehumidifying valve 40 includes a heating wire wound around the outer periphery of the medium pipeline 12 or the water absorption core 21, and a heating wire sheath for fixing the heating wire on the outer periphery of the medium pipeline 12 or the water absorption core 21.

[0046] The regeneration heater 22 of the application includes a heating wire wound around the outer periphery of the medium pipeline 12 or the water absorption core 21, and a heating wire sheath for fixing the heating wire on the outer periphery of the medium pipeline 12 or the water absorption core 21. After the heating wire is powered on, the water absorption core 21 is heated by heating. The maximum heating temperature is controlled within a set limit, such as 80℃.

[0047] In some optional embodiments, as shown in Figure 4 and Figure 5 The application provides a renewable explosion-proof breathable dehumidifying valve. The medium pipeline 12 of the explosion-proof breathable dehumidifying valve 40 is a metal pipeline, such as a copper pipe, an aluminum alloy pipe or a stainless steel pipe with good corrosion resistance and heat conduction performance. The medium pipeline 12 includes a horizontal pipeline and a vertical pipeline to form a bent pipe structure in the shape of an inverted "L". The horizontal pipeline is connected with the valve seat 11, the water absorption core 21 is located in the vertical pipeline, and the heating wire sheath and the heating wire are fixed on the outer periphery of the vertical pipeline.

[0048] The medium pipeline 12 of the embodiment of the application comprises a bend structure of an inverted "L" shape composed of a horizontal pipeline and a vertical pipeline. The shape of the medium pipeline 12 can not only save the internal space of the battery pack box 30, but also, after the water absorption core 21 is located in the vertical pipeline and the moisture is drained out of the battery pack box 30 after being heated by the heating wire and regenerated, the moisture can flow downward into the two-position three-way electromagnetic valve 23.

[0049] In some optional embodiments, referring to Figure 4 and Figure 5 the embodiment of the application provides a renewable explosion-proof air-permeable dehumidifying valve. The water absorption core 21 of the explosion-proof air-permeable dehumidifying valve 40 is any one of cotton fiber, hemp fiber, seaweed fiber, polyester fiber and polyacrylonitrile fiber.

[0050] Since the diameter of the water vapor molecules in the air is 0.0004 um, which is smaller than the diameter of the micropores on the air-permeable film 14, the water vapor can pass through the air-permeable film 14, and the air-permeable film 14 does not have the ability to filter water vapor. Therefore, it is necessary to adsorb the moisture in the air by the water absorption core 21 to reduce the humidity of the air in the battery pack box 30.

[0051] The water absorption core 21 is mainly composed of natural plant fibers or high molecular synthetic fibers. The material of the water absorption core 21 itself has certain hydrophilicity and hygroscopicity. The natural fibers are, for example, cotton fiber, hemp fiber and seaweed fiber. The high molecular synthetic fibers are, for example, polyester fiber and polyacrylonitrile fiber.

[0052] These fibers can not only improve the humidifying performance by adding hydrophilic groups, but also enhance the humidifying capacity by adding hygroscopic agents (such as calcium chloride and silica gel) or using nano coating technology.

[0053] The water absorption rate of the traditional silica gel desiccant and zeolite molecular sieve is about 30%, and the water absorption rate of the water absorption core 21 of the embodiment of the application is about 200%. In the embodiment, the water absorption core 21 is filled in the medium pipeline 12, and the air outside the battery pack box 30 can enter the battery pack box 30 only after passing through the water absorption core 21, thereby ensuring that the inside of the battery pack box 30 is in a dry environment.

[0054] In some optional embodiments, referring to Figure 1 and Figure 7 the embodiment of the application provides a renewable explosion-proof air-permeable dehumidifying valve. The explosion-proof air-permeable dehumidifying valve 40 further comprises a controller connected to the regeneration heater 22 and the two-position three-way electromagnetic valve 23. The controller controls the two-position three-way electromagnetic valve 23 to open the drainage pipeline 25 to drain the moisture adsorbed by the water absorption core 21 when the regeneration heater 22 heats the water absorption core 21 for regeneration, and controls the two-position three-way electromagnetic valve 23 to open the air pipeline 24 to balance the pressure difference between the inside and outside of the battery pack box 30 when the regeneration heater 22 stops heating the water absorption core 21.

[0055] Referring to Figure 8 As shown in the second aspect of the embodiments, a power battery pack is provided, which comprises: The battery pack box 30 is provided with a plurality of pressure relief openings on the side wall thereof, and the battery pack box 30 is provided with the regenerable explosion-proof and moisture-permeable valve 40 described in any of the embodiments, and the number of the regenerable explosion-proof and moisture-permeable valve 40 can be one or two, and the remaining pressure relief openings are provided with the pressure relief valve 50. The explosion-proof and moisture-permeable assembly 10 of the regenerable explosion-proof and moisture-permeable valve 40 is in sealing connection with the pressure relief opening, and the drain pipeline 25 extends out of the battery pack box 30.

[0056] Working principle The regenerable explosion-proof and moisture-permeable valve and the power battery pack provided by the embodiments have the following advantages. The regenerable explosion-proof and moisture-permeable valve is provided with the explosion-proof and moisture-permeable assembly 10, the explosion-proof and moisture-permeable assembly 10 comprises the valve seat 11 with one end being open and an internal cavity being formed, the medium pipeline 12 in communication with the cavity is arranged at the end of the valve seat 11 away from the opening, and the moisture-permeable film base 13 for opening or closing the opening is arranged, and the moisture-permeable film 14 in communication with the cavity is arranged on the moisture-permeable film base 13; the dehumidification and regeneration assembly 20 comprises the water absorption core 21 filled in the medium pipeline 12, the regeneration heater 22 connected to the water absorption core 21 or the outer periphery thereof, the two-position three-way electromagnetic valve 23 connected to the outlet end of the medium pipeline 12, and the air passage 24 and the drain pipeline 25 of the two-position three-way electromagnetic valve 23.

[0057] Therefore, the regenerable explosion-proof and moisture-permeable valve integrates the explosion-proof and moisture-permeable assembly 10 and the dehumidification and regeneration assembly 20, the explosion-proof and moisture-permeable assembly 10 is provided with the moisture-permeable film base 13 for opening or closing the opening on the valve seat 11, the valve seat 11 and the moisture-permeable film base 13 together form an explosion-proof valve group, and the power battery pack can be quickly relieved after thermal runaway, thereby avoiding explosion of the power battery pack. The moisture-permeable film 14 in communication with the cavity is arranged on the moisture-permeable film base 13, and the moisture-permeable film 14 limits the entry of external water and dust into the inside of the battery pack box.

[0058] The dehumidification and regeneration assembly 20 can effectively reduce the humidity in the inside of the battery pack box 30 by adsorbing water vapor in the air through the water absorption core 21, and can inhibit the generation of condensation. The regeneration heater 22 heats to realize reversible cyclic use of the water absorption core 21, and fully utilizes the moisture absorption and moisture release functions of the water absorption core 21. The two-position three-way electromagnetic valve 23 can control the discharge of moisture when the water absorption core 21 is regenerated, and can balance the internal and external air pressures of the battery pack box 30 when the water absorption core 21 is dried and filtered, thereby guaranteeing continuous and long-term stable operation of the power battery pack.

[0059] In the description of the present application, it should be noted that the terms "upper", "lower", and the like are used for indicating the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0061] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A regenerable explosion-proof breather dehumidifying valve, characterized by, The application relates to a regenerable explosion-proof air-permeable dehumidifying valve. The explosion-proof air-permeable assembly (10) comprises a valve seat (11) with an open end and a cavity formed inside, a medium pipeline (12) arranged at the end away from the opening and communicating with the cavity, and an air-permeable film base (13) for opening or closing the opening, wherein the air-permeable film base (13) is provided with an air-permeable film (14) communicating with the cavity. The dehumidifying and regenerating assembly (20) comprises a water-absorbing core (21) filled in the medium pipeline (12), a regenerating heater (22) connected to the water-absorbing core (21) or the periphery thereof, an outlet end of the medium pipeline (12) is connected with a two-position three-way electromagnetic valve (23), and the two-position three-way electromagnetic valve (23) is provided with an air vent pipeline (24) and a water drainage pipeline (25).

2. The regenerable explosion-proof air-permeable dehumidifying valve according to claim 1, wherein: the inlet end of the medium pipeline (12) is fixedly connected with the valve seat (11), and the inlet end of the medium pipeline (12) is provided with a tappet (15) connected with the air-permeable film base (13), and the tappet (15) is provided with a medium channel (15) communicating with the medium pipeline (12) and the air-permeable film (14); the cavity of the valve seat (11) is provided with a support slidingly connected with the tappet (15), and the tappet (15) is sleeved with a helical spring (16) for elastically supporting the tappet (15) to drive the air-permeable film base (13) to close the opening, one end of the helical spring (16) abuts against the support, and the other end abuts against a boss at the end of the tappet (15).

3. The regenerable explosion-proof air-permeable dehumidifying valve according to claim 1 or 2, wherein: the air-permeable film base (13) is provided with a sealing surface matched with the opening at the end close to the valve seat (11), and the opening of the valve seat (11) is provided with a first annular sealing ring (19) sealingly connected with the sealing surface; the air-permeable film base (13) is provided with a protective mask (17) at the end away from the valve seat (11), and the protective mask (17) is provided with an air-permeable gap with the air-permeable film base (13).

4. The regenerable explosion-proof air-permeable dehumidifying valve according to claim 3, wherein: the air-permeable film base (13) and the protective mask (17) are located in the opening of the valve seat (11), the outer diameters of the air-permeable film base (13) and the protective mask (17) are smaller than the inner diameter of the opening, the air-permeable film base (13) is provided with a positioning groove accommodating the air-permeable film (14) at the end away from the valve seat (11), and the air-permeable film (14) is pressed in the positioning groove by a pressing ring (18), and the pressing ring (18) is fixedly connected with the protective mask (17).

5. The regenerable explosion-proof air-permeable dehumidifying valve according to claim 1, wherein: the air-permeable film (14) is a polytetrafluoroethylene film, the air-permeable film (14) is provided with a plurality of micropores, and the diameters of the micropores range from 0.1 to 0.5 um.

6. The regenerable explosion-proof air-permeable dehumidifying valve according to claim 1, characterized in that: The regenerating heater (22) comprises a heating wire wound around the outer periphery of the medium pipe (12) or the water-absorbing core (21), and a heating wire sheath for fixing the heating wire around the outer periphery of the medium pipe (12) or the water-absorbing core (21).

7. The regenerable explosion-proof air-permeable dehumidifying valve according to claim 6, characterized in that: The medium pipe (12) is a metal pipe, and the medium pipe (12) comprises a bent pipe structure in the shape of an inverted "L" composed of a horizontal pipe and a vertical pipe, the horizontal pipe is connected with the valve seat (11), the water-absorbing core (21) is located in the vertical pipe, and the heating wire sheath and the heating wire are fixed around the outer periphery of the vertical pipe.

8. The regenerable explosion-proof air-permeable dehumidifying valve according to claim 1, characterized in that: The water-absorbing core (21) is any one of cotton fiber, hemp fiber, seaweed fiber, polyester fiber, and polyacrylonitrile fiber.

9. The regenerable explosion-proof air-permeable dehumidifying valve according to claim 1, characterized in that: Further comprising a controller connected with the regenerating heater (22) and the two-position three-way electromagnetic valve (23), the controller controls the two-position three-way electromagnetic valve (23) to open the drain pipe (25) when the regenerating heater (22) is heating the water-absorbing core (21) for regeneration, and the controller controls the two-position three-way electromagnetic valve (23) to open the air pipe (24) when the regenerating heater (22) stops heating the water-absorbing core (21).

10. A power battery pack, characterized in that, Further comprising: A battery pack box (30), a pressure relief port is formed on the side wall of the battery pack box (30), and the battery pack box is provided with the explosion-proof air-permeable dehumidifying valve (40) according to any one of claims 1 to 9, the explosion-proof air-permeable assembly (10) of the explosion-proof air-permeable dehumidifying valve (40) is sealingly connected with the pressure relief port, and the drain pipe (25) extends out of the battery pack box (30).

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