Balanced explosion-proof valve

Abstract

A balanced explosion-proof valve, comprising a valve body, a pressure relief component assembled on the upper side of the valve body, and a pneumatic balance component assembled on the lower side of the pressure relief component. The valve body includes a valve outer ring body, a valve inner ring body, and a plurality of connecting arms connecting the inner wall surface of the valve outer ring body and the outer surface of the valve inner ring body. The pressure relief component includes a piston crimped on the surface of the valve outer ring body, a waterproof and breathable membrane integrally formed on the periphery of the piston, an upper cover plate, and a magnetic sheet clamped between the upper cover plate and the piston. The pneumatic balance component is installed on the lower side of the piston and passes through the central sleeve hole. The piston includes a concave cavity, a crimping step protruding upward from the periphery of the concave cavity, and an outer ring portion protruding upward from the outer edge of the crimping step. The periphery of the waterproof and breathable membrane is fixed on the crimping step and covers the concave cavity. The periphery of the magnetic sheet is provided with a plurality of notches communicating with the outside. The manufacturing cost of this application is low.

Description

Technical Field

[0001] This application relates to the technical field of explosion-proof technology for power batteries, and particularly to a balanced explosion-proof valve. Background Art

[0002] The balanced explosion-proof valve is used to maintain the pressure balance inside and outside the power battery, relieve the pressure of the battery in advance, and avoid safety accidents caused by the explosion of the power battery. Chinese Patent Application No. 202121092721.1 discloses a balanced explosion-proof valve, which includes a valve body, a guide rod passing through the valve body, a spring disposed between the valve body and the guide rod, and a piston fixed to the end of the guide rod. The piston is provided with a vent hole corresponding to the vent central hole of the guide rod, and a waterproof breathable film covering the vent hole is installed on the piston. The guide rod is provided with a pressure balance assembly at the lower end of the vent central hole. The pressure balance assembly includes a gasket and a sealing cover for cooperatively blocking the vent central hole, an upper spring disposed between the upper end of the sealing cover and the guide rod, a support piece disposed on the lower end surface of the gasket, a lower plug fixed to the lower end of the vent central hole, and a lower spring installed between the lower plug and the support piece. The lower plug has a central hole. The above-mentioned balanced explosion-proof valve has the following defects:

[0003] First, the guide rod and the piston are designed separately. In terms of design principle, the joint between the guide rod and the piston requires tightness, otherwise the pressure balance assembly will lose its function.

[0004] Second, the bottom structure of the guide rod is complex, and the guide rod is processed by turning and milling. The complex structure will increase a large number of CNC processing procedures, resulting in a significant increase in manufacturing costs.

[0005] A vent groove is provided on the upper surface of the edge portion of the piston, and the piston is processed by turning and milling. The addition of the vent groove structure will increase the CNC processing amount and manufacturing costs. Usually, a serrated structure needs to be provided on the surface of the edge portion of the piston, which will also increase the processing amount. Summary of the Invention

[0006] In view of this, it is necessary to provide a balanced explosion-proof valve with lower manufacturing costs.

[0007] To solve the above technical problems, the present application provides a balanced explosion-proof valve, which includes a valve body, a pressure relief component assembled on the upper side of the valve body, and a pressure balance component assembled on the lower side of the pressure relief component. The valve body includes an outer valve body, an inner valve body, and a plurality of connecting arms connecting the inner wall surface of the outer valve body and the outer surface of the inner valve body. A plurality of pressure relief holes are formed between the outer valve body and the inner valve body. The inner valve body is vertically penetrated to form a central sleeve hole. The pressure relief component includes a piston pressed on the surface of the outer valve body, a waterproof and breathable membrane integrally combined with the periphery of the piston, an upper cover plate, and a magnetic sheet clamped between the upper cover plate and the piston. The pressure balance component is installed on the lower side of the piston and passes through the central sleeve hole. The piston includes a concave cavity, a pressing step protruding upward from the periphery of the concave cavity, and an outer ring portion protruding upward from the outer edge of the pressing step. The periphery of the waterproof and breathable membrane is fixed on the pressing step and covers the concave cavity. A plurality of notches are formed on the periphery of the magnetic sheet, and the notches communicate the waterproof and breathable membrane with the outside.

[0008] Preferably, the magnetic sheet includes a middle part and a combined outer ring integrally extending radially outward from the middle part. The combined outer ring is clamped between the outer ring portion and the upper cover plate. The notch penetrates radially outward from the middle part to communicate the waterproof and breathable membrane with the outside.

[0009] Preferably, the middle part of the magnetic sheet is formed by downward stamping and depression. An inner edge of the outer ring portion of the piston is formed with a snap step portion by downward depression. The middle part of the magnetic sheet is downwardly snapped into the snap step portion.

[0010] Preferably, the inner side of the notch is located above the waterproof and breathable membrane, the outer side of the notch communicates with the outside, and the upper and lower surfaces of the combined outer ring are respectively bonded and fixed to the surfaces of the upper cover plate and the outer ring portion.

[0011] Preferably, a plurality of wrinkles are formed on the combined outer ring by stamping, so that the upper and lower surfaces of the combined outer ring form a rough surface, and the rough surface is used to accommodate glue to enhance the firmness of the combination.

[0012] Preferably, the pressure relief component further includes a pressure ring for pressing the waterproof and breathable membrane on the pressing step portion. The outer diameter of the pressure ring is not less than the inner diameter of the pressing step portion, and the pressure ring is riveted into the pressing step portion to press the waterproof and breathable membrane tightly.

[0013] Preferably, the outer valve body includes a lower outer ring and an upper outer ring extending upward from the outer edge of the lower outer ring. The thickness of the lower outer ring is greater than the thickness of the upper outer ring. An upper sealing ring groove is formed on the inner side of the lower outer ring surface and located above the upper outer ring. A first sealing ring is installed in the upper sealing ring groove, and the bottom surface of the outer ring portion is pressed on the first sealing ring.

[0014] Preferably, the upper part of the outer ring surrounds the outer ring part, the magnetic attraction sheet and the upper cover plate. The balance explosion-proof valve is installed on the battery case of the power battery. A lower sealing ring groove is provided on the bottom side of the lower part of the outer ring. A second sealing ring is installed in the lower sealing ring groove, and the second sealing ring is clamped and sealed between the lower part of the outer ring and the battery case.

[0015] Preferably, the air pressure balance component includes a guide rod passing through the central sleeve hole, a lower plug screwed to the lower end of the guide rod, and a balance valve installed in the guide rod and the lower plug. A balance cavity is formed upward at the lower end of the guide rod, a plug cavity is formed downward at the lower plug, the balance valve is installed in the balance cavity and the plug cavity, a central hole communicating the waterproof breathable membrane and the balance cavity is formed through the upper and lower parts of the guide rod, an outer convex ring protrudes radially outward along the outer periphery of the lower plug, and a pressure relief spring is sleeved outside the guide rod, and the pressure relief spring is supported between the inner ring body of the valve and the outer convex ring of the lower plug.

[0016] Preferably, a threaded part is provided on the outer periphery of the lower end of the guide rod. The plug also includes a cavity outer wall surrounding the plug cavity, a cavity bottom wall, and a through hole penetrating the cavity bottom wall up and down. A threaded part is provided on the inner wall surface at the upper end of the plug cavity, and the threaded part of the lower plug is screwed onto the threaded part on the outer surface of the lower end of the guide rod. The outer convex ring is formed by protruding radially outward from the lower end of the cavity outer wall.

[0017] Preferably, the balance valve includes a balance plug, a sealing pad with an outer diameter larger than that of the balance plug and laminated on the lower side of the balance plug, a rigid gasket laminated on the lower side of the sealing pad, an upper spring abutted against the upper side of the balance plug and the top surface of the balance cavity, and a lower spring supported between the rigid gasket and the cavity bottom wall.

[0018] Preferably, the balance plug includes a balance plug body with an outer diameter smaller than the inner diameter of the balance cavity, and an extension rod protruding downward and extending from the balance plug body. A perforation is formed between the sealing pad and the rigid gasket, and the sealing pad and the rigid gasket are sleeved on the extension rod through the perforation. The inner diameter of the perforation is larger than the outer diameter of the extension rod. The sealing pad is made of a flexible material, and the upper surface of the sealing pad is attached to the lower end surface of the guide rod for sealing.

[0019] Preferably, the guide rod and the piston are of an integral structure.

[0020] Preferably, a threaded hole penetrates through the upper part of the concave cavity of the piston. The top of the guide rod is provided with a coupling head screwed into the threaded hole. A balance cavity is formed by the downward depression at the bottom of the guide rod. A central hole communicating the waterproof breathable membrane and the balance cavity is formed through the upper and lower parts of the guide rod.

[0021] In this application, the outer diameter of the magnetic attraction sheet is enlarged to form a combined outer ring, and the combined outer ring is clamped between the outer ring part and the upper cover plate. The notch of the magnetic attraction sheet replaces the ventilation function of the ventilation groove, simplifying the structure of the piston or the upper cover plate. Moreover, the magnetic attraction sheet has a simple structure and is directly stamped, resulting in lower manufacturing costs. Brief Description of the Drawings

[0022] The drawings described herein are used to provide a further understanding of this application and form a part of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application.

[0023] Embodiment 1

[0024] Figure 1 It is a three-dimensional view of the balance explosion-proof valve of Embodiment 1 assembled on the power battery housing;

[0025] Figure 2 It is a three-dimensional view of the valve body of the balance explosion-proof valve of Embodiment 1;

[0026] Figure 3 It is a three-dimensional exploded view of the balance explosion-proof valve of Embodiment 1;

[0027] Figure 4 It is for the balance explosion-proof valve of Embodiment 1 in Figure 3 The cross-sectional view in the disassembled state;

[0028] Figure 5 It is a three-dimensional view of the piston of the balance explosion-proof valve of Embodiment 1;

[0029] Figure 6 It is a three-dimensional view of the balance explosion-proof valve of Embodiment 1 in the state of removing the upper cover plate;

[0030] Figure 7 It is the cross-sectional view of the balance explosion-proof valve of Embodiment 1 in the combined state;

[0031] Figure 8 It is a schematic diagram of the balance explosion-proof valve of Embodiment 1 in the negative pressure state;

[0032] Figure 9 It is a schematic diagram of the balance explosion-proof valve of Embodiment 1 in the positive pressure state;

[0033] Figure 10 It is a schematic diagram of the balance explosion-proof valve of Embodiment 1 in the pressure relief state;

[0034] Embodiment 2

[0035] Figure 11 It is the cross-sectional view of the balance explosion-proof valve of Embodiment 2 in the combined state;

[0036] Embodiment 3

[0037] Figure 12 Cross-sectional view of the balanced explosion-proof valve in the disassembled state for Embodiment III;

[0038] Figure 13 Exploded perspective view of the piston, magnetic attraction sheet and upper cover plate of the balanced explosion-proof valve for Embodiment III;

[0039] Figure 14 Another perspective exploded perspective view of the piston, magnetic attraction sheet and upper cover plate of the balanced explosion-proof valve for Embodiment III;

[0040] Figure 15 Perspective view of the magnetic attraction sheet of the balanced explosion-proof valve assembled on the upper cover plate for Embodiment III;

[0041] Figure 16 Cross-sectional view of the piston, waterproof breathable film, pressure ring, magnetic attraction sheet and upper cover plate of the balanced explosion-proof valve in the combined state for Embodiment III;

[0042] Embodiment IV

[0043] Figure 17 Exploded perspective view of the piston, magnetic attraction sheet and upper cover plate of the balanced explosion-proof valve for Embodiment IV;

[0044] Figure 18 Another perspective exploded perspective view of the piston, magnetic attraction sheet and upper cover plate of the balanced explosion-proof valve for Embodiment IV;

[0045] Figure 19 Cross-sectional view of the piston, waterproof breathable film, pressure ring, magnetic attraction sheet and upper cover plate of the balanced explosion-proof valve in the combined state for Embodiment IV;

[0046] Embodiment V

[0047] Figure 20 Exploded perspective view of the piston, magnetic attraction sheet and upper cover plate of the balanced explosion-proof valve for Embodiment V.

[0048] Explanation of reference numerals

[0049] Battery housing - A; valve body - 10; outer valve ring body - 11; lower part of the outer ring - 111; upper part of the outer ring - 112; inner valve ring body - 12; outer side groove - 121; connecting arm - 13; pressure relief hole - 14; central sleeve hole - 15; upper sealing ring groove - 16; lower sealing ring groove - 17; fixed ear - 18; first sealing ring - 101; second sealing ring - 102; pressure relief component - 20; piston - 21; outer ring part - 211; rough surfaces - 2111, 2112; concave cavity - 212; crimping step - 213; snap - on step - 214; central hole - 215; ventilation grooves - 216, 252; threaded hole - 218; waterproof and breathable membrane - 22; pressure ring - 23; magnetic attraction sheet - 24; notch - 241; elastic snap - on block - 242; middle part - 243; combined outer ring - 244; fold - 245; upper cover plate - 25; lower protruding part - 251; air pressure balance component - 30; guide rod - 31; balance cavity - 311; threaded parts - 312, 336; combined head - 313; protective shell - 32; lower plug - cover - 33; outer wall of the cavity - 331; outer convex ring - 332; plug - cover cavity - 333; bottom wall of the cavity - 334; through - hole - 335; upper spring - 341; lower spring - 342; pressure relief spring - 35; balance valve - 36; balance plug - 361; upper limit part - 3611; balance plug body - 3612; extension rod - 3613; convex edge - 3614; gasket - 362; rigid gasket - 363; perforation - 364. Detailed implementation mode

[0050] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments of this application and the corresponding drawings.

[0051] Please refer to Figure 1 As shown, the balance explosion - proof valve of this application is used for power batteries, and the balance explosion - proof valve is installed on the battery housing A of the power battery. It mainly realizes two functions. One is to balance the internal and external pressures of the power battery and achieve the effects of waterproofing and dust - proofing when the internal pressure of the power battery fluctuates within a small range. The other is to quickly release the internal pressure of the power battery when the internal pressure of the power battery surges, achieving the pressure - relief ability to prevent the power battery from exploding.

[0052] Embodiment 1

[0053] Please refer to Figures 1 to 5 、 Figure 7 As shown, the balance explosion - proof valve of Embodiment 1 includes a valve body 10, a pressure relief component 20 assembled in the valve body 10, and an air pressure balance component 30.

[0054] The battery housing 10 is provided with an installation hole, and the valve body 10 is fixed to the periphery of the installation hole. The valve body 10 includes a valve outer ring body 11, a valve inner ring body 12 located in the middle of the valve outer ring body 11, and a plurality of connecting arms 13 connecting the valve outer ring body 11 and the valve inner ring body 12.

[0055] The valve outer ring body 11 includes a lower outer ring part 111 and an upper outer ring part 112 extending upward from the lower outer ring part 111. The thickness of the lower outer ring part 111 is greater than that of the upper outer ring part 112. An upper sealing ring groove 16 is provided on the upper surface of the lower outer ring part 111 inside the upper outer ring part 112. A lower sealing ring groove 17 is provided on the bottom surface of the lower outer ring part 111. A pair of fixed ear parts 18 are integrally extended on the outer side of the valve outer ring body 11, and the valve body 10 is fixed to the battery housing A through the fixed ear parts 18.

[0056] An outer side groove 121 is provided on the outer peripheral surface of the valve inner ring body 12 in the vertical direction. The connecting arm 13 connects the inner wall surface of the lower outer ring part 111 and the outer surface of the valve inner ring body 12. The valve body 10 is processed by metal integral turning. The bottom surface of the valve inner ring body 12 is lower than the bottom surface of the valve outer ring body 11. A first sealing ring 101 and a second sealing ring 102 are respectively pressed into the upper sealing groove 16 and the lower sealing groove 17. The top surface of the valve inner ring body 12 does not extend upward beyond the upper sealing ring groove 16. A plurality of pressure relief holes 14 are formed between the valve outer ring body 11 and the valve inner ring body 12. A central sleeve hole 15 is formed through the valve inner ring body 12 up and down, and the pressure relief holes 14 are separated by the connecting arms 13.

[0057] The pressure relief assembly 20 includes a piston 21 elastically pressed on the first sealing ring 101, a waterproof breathable membrane 22, a pressing ring 23 pressing the waterproof breathable membrane 22 on the piston 21, a magnetic sheet 23 installed on the piston 21, and an upper cover plate 25 attached to the upper surface of the piston 21.

[0058] For key reference Figure 5As shown, the piston 21 includes a concave portion 212, a crimping step 213, a snap step 214, and an outer ring portion 211. In the surface horizontal position, from bottom to top, are the concave portion 212, the crimping step 213, the snap step 214, and the outer ring portion 211 in sequence, that is, the surface of the outer ring portion 211 is higher than the surface of the snap step 214, the surface of the snap step 214 is higher than the surface of the crimping step 213, and the surface of the crimping step 213 is higher than the surface of the concave portion 212. The bottom surface of the outer ring portion 211 is higher than the upper surface of the crimping step 213. The bottom surface of the outer ring portion 211 presses on the first sealing ring 101 and is supported by the surface of the lower part of the outer ring 111. The bottom surface of the outer ring portion 211 and the lower part of the outer ring 111 clamp the first sealing ring 101 to achieve sealing, and the clamping force between the two is the elastic force of the spring. Specifically, a limiting member is connected or extends downward from the lower part of the concave portion 212, and a pressure relief spring 35 is sleeved outside the limiting member. The pressure relief spring 35 is clamped between the lower end of the valve inner ring body 12 and the limiting member, so that the piston 21 is elastically tightened on the upper side of the lower part of the outer ring 111.

[0059] Highlight as Figure 10 As shown, when the pressure in the power battery is greater than the elastic force critical value of the pressure relief spring 35, the high-pressure gas in the battery pushes the piston 21 upward away from the valve body 10, so that the high-pressure gas flow overflows outward through the pressure relief hole 14 to achieve the effect of releasing the internal pressure of the battery and avoid explosion due to excessive internal pressure of the battery.

[0060] A plurality of ventilation grooves 216 are radially formed on the upper surface of the outer ring portion 211, and the upper surface of the outer ring portion 211 is roughened to form a rough surface 2111, 2112. For example, a plurality of sawtooth grooves are formed along the arc direction, including a deeper sawtooth groove 2111 and a shallower sawtooth groove 2112. A guide rod 31 extends downward from the bottom of the concave cavity 212 of the piston 21. The lower end of the guide rod 31 is open and a balance cavity 311 is formed upward. A threaded portion 312 is provided on the outer side of the lower end of the guide rod 31. A central hole 215 communicating the concave cavity 212 with the balance cavity 311 is formed through the middle of the concave cavity 212 in the up and down direction.

[0061] Highlight for reference Figure 6 、 Figure 7As shown, the waterproof and breathable membrane 22 is crimped by the crimping ring 23 onto the crimping step 213 and covers the concave cavity 212, such that the central hole 215 is closed by the waterproof and breathable membrane 22. The outer diameter of the crimping ring 23 is slightly larger than the inner diameter of the crimping step 213, and the crimping ring 23 is riveted onto the crimping step 213 to fix the periphery of the waterproof and breathable membrane 22. The magnetic sheet 24 is crimped within the snap step 214. At a position corresponding to the ventilation groove 216 on the periphery of the magnetic sheet 24, there is a notch 241, and the notch 214 communicates the upper side of the waterproof and breathable membrane 22 with the ventilation groove 216. At least one pair of elastic snap blocks 242 are formed by extending radially along both sides of the notch 214, and the elastic snap blocks 242 protrude radially and are snapped into one of the ventilation grooves 216 to strengthen the fixation and positioning of the magnetic sheet 24. The upper cover plate 25 is adhesively fixed to the upper surface of the outer ring portion 211. The rough surfaces 2111, 2112 on the upper surface of the outer ring portion 211 are used to accommodate glue so that the upper cover plate 25 closely adheres to the rough surfaces 2111, 2112.

[0062] Please continue to refer to Figure 3 , Figure 4 , Figure 7 As shown, the air pressure balance assembly 30 includes the guide rod 31, a lower plug 33 fixed to the bottom of the guide rod 31, a balance valve 36 installed between the guide rod 31 and the lower plug 33, an upper spring 341, a lower spring 342, and a protective shell 32.

[0063] The upper end of the lower plug 33 is open and is provided with a plug cavity 333. On the inner wall surface of the plug cavity 333, there is a threaded portion 336 such that the lower plug 33 is screwed onto the threaded portion 312 at the lower end of the guide rod 31. The two ends of the upper spring 341 respectively abut against the top of the balance cavity 311 and the upper surface of the balance valve 36, and the two ends of the lower spring 342 respectively abut against the bottom of the balance valve 36 and the bottom surface of the plug cavity 333.

[0064] The balance valve 36 includes a balance plug 361, a gasket 362, and a rigid gasket 363. The balance plug 361 includes a balance plug body 3612, an upper limit portion 3611 protruding upward from the top of the balance plug body 3612, and an extension rod 3613 extending downward from the lower side of the balance plug body 3612. The outer diameter of the balance plug body 3612 is not greater than the inner diameter of the balance cavity 311, the outer diameter of the upper limit portion 3611 is smaller than the outer diameter of the balance plug body 3612, and the outer diameter of the extension rod 3613 is smaller than the outer diameter of the upper limit portion 3611. One end of the upper spring 341 is sleeved outside the upper limit portion 3611, and the balance plug body 3612 enters the balance cavity 311. A convex edge 3614 also protrudes downward from the outer peripheral edge of the bottom surface of the balance plug body 3612.

[0065] A perforation 364 is formed between the gasket 362 and the rigid gasket 363. The gasket 362 and the rigid gasket 363 are sequentially sleeved on the extension rod 3613, and the inner diameter of the perforation 364 is greater than the outer diameter of the extension rod 3613. The gasket 362 is made of a flexible waterproof material. The outer diameter of the gasket 362 is greater than the inner diameter of the balance cavity 311 and smaller than the outer diameter of the guide rod 31 or the inner diameter of the plug cover cavity 333. The upper end of the lower spring 342 abuts against the lower part of the rigid gasket 363, and the gasket 362 is squeezed by the rigid gasket 363 and the lower spring 342 to be attached to the end face of the guide rod 31 to achieve sealing.

[0066] The lower plug 33 further includes a cavity outer wall 331, a cavity bottom wall 334, an outer convex ring 332 protruding from the outer periphery of the lower side of the cavity outer wall 331, and a through hole 335 penetrating the cavity bottom wall 334 up and down. The two ends of the pressure relief spring 35 respectively abut against the valve inner ring body 12 and the outer convex ring 332. The guide rod 31 and the lower plug 33 constitute the aforementioned limiting member.

[0067] The protective shell 32 is in a cup-shaped structure and is sleeved upward on the outer periphery of the valve inner ring body 12. Specifically, the protective shell 32 protects the guide rod 31, the lower plug 33, and the components therein. And the inner wall surface of the protective shell 32 is adhesively fixed to the outer surface of the valve inner ring body 12. The outer side groove 121 communicates the interior of the battery with the space inside the protective shell 32.

[0068] The function of the air pressure balance assembly 30 is to balance the pressure inside and outside the battery, that is, when the inside of the battery is in negative pressure or the internal pressure is less than the pressure relief critical value, the air pressure inside and outside the battery is kept balanced.

[0069] When the negative pressure inside the battery reaches the critical value, that is, when the pressure inside the battery overcomes the elastic force of the lower spring 342, for key reference Figure 8As shown, the external air pressure pushes the balance valve 36 downward, squeezing the lower spring 342. The gasket 36 is disengaged from the end face of the guide rod 31 and loses its sealing function. The external gas enters the piston 21 through the ventilation groove 216. After passing through the waterproof and breathable film 22, the external gas reaches the balance chamber 311 downward from the central hole 215, and then enters the plug cover chamber 333 along the outer periphery of the balance valve 36, and then enters the battery interior through the through hole 335 and the outer groove 121 to achieve air pressure balance.

[0070] When the positive pressure inside the battery reaches the critical value, that is, when the internal pressure of the battery overcomes the elastic force of the upper spring 341, please refer to Figure 9 As shown, the internal pressure of the battery pushes the balance valve 36 upward, causing the balance plug 361 of the balance valve 36 to rise. At this time, the air flow inside the battery enters the balance chamber 311 from the plug cover chamber 333 along the gap between the extension rod 3613 and the perforation 364, and then flows out through the gap between the balance plug 361 and the inner wall surface of the balance chamber 311, the central hole 215, the waterproof and breathable film 22, and the ventilation groove 216, so as to achieve balance between the internal and external pressures of the battery.

[0071] In the first embodiment, the guide rod 31 and the piston 21 are integrally processed, avoiding the need to handle the sealing problem between the guide rod 31 and the piston 21 when they are combined, and increasing the structural stability of the product. At the same time, the lower plug 33 is fixed to the lower end of the guide rod 31 and supports one end of the pressure relief spring 35, which can effectively reduce the structural complexity of the balance chamber 311 of the guide rod 31 and reduce the processing difficulty of the guide rod 31 or the piston 21.

[0072] The second embodiment

[0073] Please refer to Figure 11 、 Figure 12 As shown, compared with the first embodiment, the difference in the second embodiment is that the piston 21 and the guide rod 31 are of a split structure. At this time, a threaded hole 218 is provided in the middle of the concave cavity 212, and a coupling head 313 is provided at the upper edge of the guide rod 31. The coupling head 313 is screwed into the threaded hole 218. In this structure, when the guide rod 31 is screwed into the threaded hole 218, a sealing ring is clamped between the guide rod 31 and the piston 21 to achieve the sealing performance between the piston 21 and the guide rod 31. Or waterproof glue is applied at the joint between the piston 21 and the guide rod 31 to achieve sealing. In this embodiment, the central hole 215 penetrates the guide rod 31 up and down.

[0074] The third embodiment

[0075] Please refer to Figures 12 to 16As shown, compared with the second embodiment, the difference in the third embodiment is that the rough surfaces 2111 and 2112 provided on the outer ring portion 211 of the piston 21 and the ventilation groove 216 are cancelled and provided on the upper cover plate 25. Specifically, a lower protruding portion 251 protrudes downward from the outer periphery of the upper cover plate 25, and a rough surface is formed on the surface of the lower protruding portion 251. The lower protruding portion 251 is formed with a ventilation groove 252 penetrating in the radial direction.

[0076] The magnetic attraction sheet 24 is buckled in the upper cover plate 25, that is, the elastic buckle block 242 is held in the ventilation groove 252. The elastic buckle block 242 is a pair of elastic components, which are riveted into the ventilation groove 252 to fix the magnetic attraction sheet 24 on the upper cover plate 25. The notch 241 is located above the waterproof and breathable membrane 22 in the vertical direction to achieve ventilation.

[0077] In this embodiment, the ventilation groove 252 is provided on the upper cover plate 25, and the structure of the upper cover plate 25 is simple and can be manufactured by stamping and stretching processes. However, the piston 21 needs to be precision machined by CNC. The processing cost of the ventilation groove 216 and its surface rough surfaces 2111 and 2112 in the second embodiment is relatively high. Compared with the technical solution of providing the ventilation groove 252 on the piston 21, the manufacturing cost of the solution in this embodiment can be greatly reduced, enhancing the product competitiveness.

[0078] In this embodiment, the middle part of the upper cover plate 25 can also be punched and stretched upward to form an upward concave portion, and the edge part of the upper cover plate 25 can be the lower protruding portion 251 and the ventilation groove 252 can be provided.

[0079] Embodiment Four

[0080] Please refer to Figures 17 to 19As shown, compared with the second embodiment, the difference in the fourth embodiment is that the ventilation groove 216 is not provided on the outer ring portion 211 of the piston 21. The upper surface of the outer ring portion 211 is also provided with rough surfaces 2111, 2112 to accommodate glue. The outer diameter of the magnetic attraction sheet 24 is increased to at least partially cover the upper surface of the outer ring portion 211. Thus, the magnetic attraction sheet 24 includes a middle portion 243 suspended above the waterproof and breathable membrane 22 and a combined outer ring 244 protruding from the periphery of the middle portion 243, and the notch 241 penetrates the combined outer ring 244 radially outward from the middle portion 243. The middle portion 243 is recessed downward to form a recessed structure so that the lower part of the middle portion 243 is buckled downward above the crimping step 213 for positioning. The combined outer ring 244 is clamped between the outer ring portion 211 and the upper cover plate 25 and bonded and fixed. Rough surfaces or serrated structures are provided on the edges of both the outer ring portion 211 and the upper cover plate 25 to accommodate glue and enhance the bonding force. And the notch 241 communicates with the outside along the radial direction through the waterproof and breathable membrane 22 to achieve ventilation.

[0081] In this embodiment, the outer diameter of the magnetic attraction sheet 24 is enlarged to form the combined outer ring 244, so that the combined outer ring 244 is clamped between the outer ring portion 211 and the upper cover plate 25, and the notch 241 of the magnetic attraction sheet 24 replaces the ventilation function of the ventilation grooves 216, 252, simplifying the structure of the piston 21 or the upper cover plate 25. Moreover, the structure of the magnetic attraction sheet 24 is simple and it is directly formed by stamping, with lower manufacturing costs.

[0082] Embodiment Five

[0083] Please refer to Figure 20 As shown, compared with the fourth embodiment, the difference in this embodiment is that rough surfaces are no longer provided on the surface of the edge of the upper cover plate 25 and the outer ring portion 211 of the piston 21, and the combined outer ring 244 of the magnetic attraction sheet 24 is stamped to form wrinkles 245, so that rough surfaces or serrated structures are formed on both the upper and lower surfaces of the combined outer ring 244 of the magnetic attraction sheet 24, making the bonding between the combined outer ring 244 and the upper cover plate 25 and the outer ring portion 211 of the piston 21 firm.

[0084] In this embodiment, wrinkles 245 are stamped on the combined outer ring 244 of the magnetic attraction sheet 24 to form rough surfaces on both the upper and lower surfaces of the combined outer ring 244. Compared with separately providing rough surfaces on the outer ring portion 211 and the upper cover plate 25, the manufacturing cost is lower.

[0085] The above are only the embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A balanced explosion-proof valve, comprising a valve body, a pressure relief component assembled on the upper side of the valve body, and a pneumatic balance component assembled on the lower side of the pressure relief component. The valve body includes an outer valve body, an inner valve body, and a plurality of connecting arms connecting the inner wall surface of the outer valve body and the outer surface of the inner valve body. A plurality of pressure relief holes are formed between the outer valve body and the inner valve body. The inner valve body is vertically penetrated to form a central sleeve hole, and is characterized in that, The pressure relief component includes a piston crimped on the surface of the outer valve body, a waterproof and breathable membrane integrally formed on the periphery of the piston, an upper cover plate, and a magnetic attraction sheet clamped between the upper cover plate and the piston. The air pressure balance component is installed on the lower side of the piston and passes through the central sleeve hole. The piston includes a concave cavity, a crimping step protruding upward from the periphery of the concave cavity, and an outer ring portion protruding upward from the outer edge of the crimping step. The periphery of the waterproof and breathable membrane is fixed on the crimping step and covers the concave cavity. A plurality of notches are formed on the periphery of the magnetic attraction sheet, and the notches communicate the waterproof and breathable membrane with the outside. The magnetic attraction sheet includes a middle portion and a combined outer ring integrally extending outward along the radial direction from the middle portion. The combined outer ring is clamped between the outer ring portion and the upper cover plate, and the notches penetrate from the middle portion along the radial outside to communicate the waterproof and breathable membrane with the outside.

2. The balanced explosion-proof valve according to claim 1, characterized in that The middle portion of the magnetic attraction sheet is formed by downward stamping and recessing, and a snap step portion is formed by downward recessing of the inner edge of the outer ring portion of the piston. The middle portion of the magnetic attraction sheet is snapped into the snap step portion.

3. The balanced explosion-proof valve according to claim 2, characterized in that, The inner side of the notch is located above the waterproof and breathable membrane, the outer side of the notch communicates with the outside, and the upper and lower surfaces of the combined outer ring are respectively bonded and fixed to the surfaces of the upper cover plate and the outer ring portion.

4. The balanced explosion-proof valve according to claim 3, characterized in that, A plurality of folds are formed on the combined outer ring by stamping, so that the upper and lower surfaces of the combined outer ring form a rough surface, and the rough surface is used to accommodate glue to enhance the firmness of the bonding.

5. The balanced explosion-proof valve according to claim 4, wherein, The pressure relief component further includes a pressure ring for crimping the waterproof and breathable membrane on the crimping step portion. The outer diameter of the pressure ring is not less than the inner diameter of the crimping step portion, and the pressure ring is riveted into the crimping step portion to press the waterproof and breathable membrane.

6. The balanced explosion-proof valve according to claim 5, characterized in that, The outer valve body includes a lower outer ring and an upper outer ring extending upward from the outer edge of the lower outer ring. The thickness of the lower outer ring is greater than that of the upper outer ring. An upper sealing ring groove is formed on the inner side of the upper outer ring on the surface of the lower outer ring, and a first sealing ring is installed in the upper sealing ring groove. The bottom surface of the outer ring portion is crimped on the first sealing ring.

7. The balanced explosion-proof valve according to claim 6, characterized in that, The upper outer ring surrounds the periphery of the outer ring portion, the magnetic attraction sheet and the upper cover plate. The balance explosion-proof valve is installed on the battery housing of the power battery. A lower sealing ring groove is provided on the bottom side of the lower outer ring, and a second sealing ring is installed in the lower sealing ring groove. The second sealing ring is clamped and sealed between the lower outer ring and the battery housing.

8. The balanced explosion-proof valve according to claim 1, characterized in that, The air pressure balance component includes a guide rod passing through the central sleeve hole, a lower plug screwed to the lower end of the guide rod, and a balance valve installed in the guide rod and the lower plug. A balance cavity is formed upward at the lower end of the guide rod, a plug cavity is formed downward at the lower plug, and the balance valve is installed in the balance cavity and the plug cavity. A central hole communicating the waterproof and breathable membrane with the balance cavity is formed through the guide rod up and down. An outer convex ring protrudes radially along the periphery of the lower plug. A pressure relief spring is sleeved outside the guide rod, and the pressure relief spring is supported between the inner valve body and the outer convex ring of the lower plug.

9. The balanced explosion-proof valve according to claim 8, characterized in that, The outer periphery of the lower end of the guide rod is provided with a threaded portion. The lower plug cover further includes a cavity outer wall, a cavity bottom wall surrounding the plug cover cavity, and a through hole penetrating the cavity bottom wall up and down. The inner wall surface of the upper end of the plug cover cavity is provided with a threaded portion. The threaded portion of the lower plug cover is screwed onto the threaded portion on the outer surface of the lower end of the guide rod. The outer convex ring is formed by protruding radially outward from the lower end of the cavity outer wall.

10. The balanced explosion-proof valve according to claim 9, wherein, The balance valve includes a balance plug, a sealing gasket with an outer diameter larger than that of the balance plug and laminated on the lower side of the balance plug, a rigid gasket laminated on the lower side of the sealing gasket, an upper spring abutting between the upper side of the balance plug and the top surface of the balance cavity, and a lower spring supported between the rigid gasket and the cavity bottom wall.

11. The balanced explosion-proof valve according to claim 10, wherein, The balance plug includes a balance plug body with an outer diameter smaller than the inner diameter of the balance cavity, and an extension rod protruding downward and extending from the balance plug body. A perforation is formed between the sealing gasket and the rigid gasket. The sealing gasket and the rigid gasket are sleeved on the extension rod through the perforation. The inner diameter of the perforation is larger than the outer diameter of the extension rod. The sealing gasket is made of a flexible material, and the upper surface of the sealing gasket is attached to the lower end surface of the guide rod for sealing.

12. The balanced explosion-proof valve according to claim 8, characterized in that, The guide rod and the piston are of an integral structure.

13. The balanced explosion-proof valve according to claim 8, wherein, A threaded hole penetrates through the upper part of the concave cavity of the piston. The top of the guide rod is provided with a coupling head screwed into the threaded hole. The bottom of the guide rod is recessed upward to form a balance cavity. A central hole penetrating the guide rod up and down is formed to connect the waterproof and breathable membrane and the balance cavity.

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