Explosion-proof breather valve and battery box

Abstract

The utility model discloses a kind of explosion-proof breather valve and battery box, it is related to valve body technical field, wherein explosion-proof breather valve includes main body, movable framework, breathable membrane, reset spring and anti-moist cap;Main body is formed with mounting hole, and the circumferential of mounting hole is equipped with explosion vent;Movable framework includes movable cover and guide rod, movable cover is located in guide rod, guide rod is slidably connected in the hole wall of mounting hole, and movable cover is covered in explosion vent;The end of guide rod away from movable cover is formed with convex part;Breathable membrane is located in the side of movable cover away from explosion vent;Reset spring is sleeved in guide rod, and the both ends of reset spring are respectively abutted on the side of main body away from movable cover and the end of guide rod away from movable cover;Anti-moist cap is detachably connected to main body, and is enclosed with main body to form sealed cavity containing reset spring;The inner circumferential wall of anti-moist cap is provided with sliding slot, and convex part is slidably connected in sliding slot.The technical scheme of the utility model aims at improving the sealing reliability of explosion-proof breather valve.

Description

Technical Field

[0001] This utility model relates to the field of valve body technology, and in particular to an explosion-proof vent valve and a battery box. Background Technology

[0002] A battery explosion-proof vent valve is a safety pressure relief device integrated into the casing of a battery cell or battery module. It is usually made of metal or composite materials and has a grooved valve plate or elastic diaphragm inside. When the internal air pressure rises sharply to a set threshold (such as 3-5 kPa) due to thermal runaway or short circuit, the valve plate opens instantly to form a directional venting channel, quickly expelling high-temperature and high-pressure gas and electrolyte vapor, preventing the casing from rupturing and suppressing the spread of flames. Afterward, it remains open to avoid secondary pressurization, thereby limiting thermal runaway to a single battery cell or a local module.

[0003] In explosion-proof vent valves, the vent membrane is usually mounted on a movable frame, which is then mounted on a guide rod. The guide rod guides the movement of the movable frame by engaging with the mounting holes on the main body. However, in some explosion-proof vent valves, the mounting holes on the main body are relatively short. When the guide rod is inserted into the mounting hole, its end may wobble. After wobble, the movable frame may get stuck on the main body and cannot return to its original position, causing the explosion-proof vent valve to fail to seal. Utility Model Content

[0004] The main purpose of this invention is to provide an explosion-proof vent valve and battery box, which aims to reduce the probability of seal failure of the explosion-proof vent valve.

[0005] To achieve the above objectives, the explosion-proof vent valve proposed in this utility model includes:

[0006] The main body is used to fix it to the side wall of the battery box. The main body has a mounting hole and the mounting hole is provided with a vent for the battery box around its circumference.

[0007] A movable frame includes a movable cover plate and a guide rod. The movable cover plate is disposed on the guide rod, and the guide rod is slidably connected to the wall of the mounting hole. The movable cover plate covers the explosion vent. A protrusion is formed at the end of the guide rod away from the movable cover plate.

[0008] A breathable membrane is provided on the side of the movable cover plate opposite to the explosion vent.

[0009] A return spring, wherein the return spring is sleeved on the guide rod, and the two ends of the return spring respectively abut against the side of the main body away from the movable cover plate and the end of the guide rod away from the movable cover plate; and

[0010] A moisture-proof cap is detachably connected to the main body and forms a sealed cavity with the main body to accommodate the return spring; the inner peripheral wall of the moisture-proof cap is provided with a sliding groove, and the protrusion is slidably connected in the sliding groove.

[0011] In one embodiment, a convex ring is formed at the end of the guide rod away from the movable cover plate, and the two ends of the return spring abut against the side of the main body away from the movable cover plate and the side of the convex ring facing the movable cover plate, respectively; the protrusion is formed on the outer peripheral wall of the convex ring.

[0012] In one embodiment, the outer peripheral wall of the convex ring is formed with two oppositely arranged protrusions, and the moisture-proof cap is provided with two oppositely arranged sliding grooves, with each protrusion slidably connected to the corresponding sliding groove.

[0013] In one embodiment, the movable cover plate has a connecting post protruding towards the guide rod, and the movable cover plate is threadedly connected to the guide rod through the connecting post; at least a portion of the structure of the connecting post is located inside the guide rod.

[0014] In one embodiment, the main body has a groove on the side facing the movable frame, and the explosion-proof vent valve further includes a sealing ring, which is disposed in the first annular groove and abuts against the movable cover plate and the bottom wall of the first annular groove respectively.

[0015] In one embodiment, the sealing ring has a top surface and a bottom surface disposed opposite to each other, the top surface abutting against the movable cover plate, and the bottom surface abutting against the bottom wall of the first annular groove; both the top surface and the bottom surface are provided with a second annular groove.

[0016] In one embodiment, the main body is formed with mounting ribs, the mounting ribs form the mounting holes, and the periphery of the mounting ribs is formed with a hollow area.

[0017] In one embodiment, the waterproof cap is made of nylon.

[0018] In one embodiment, the main body is made of nylon.

[0019] This utility model also proposes a battery box, the battery box comprising:

[0020] The main body is used to fix it to the side wall of the battery box. The main body has a mounting hole and the mounting hole is provided with a vent for the battery box around its circumference.

[0021] A movable frame includes a movable cover plate and a guide rod. The movable cover plate is disposed on the guide rod, and the guide rod is slidably connected to the wall of the mounting hole. The movable cover plate covers the explosion vent. A protrusion is formed at the end of the guide rod away from the movable cover plate.

[0022] A breathable membrane is provided on the side of the movable cover plate opposite to the explosion vent.

[0023] A return spring, wherein the return spring is sleeved on the guide rod, and the two ends of the return spring respectively abut against the side of the main body away from the movable cover plate and the end of the guide rod away from the movable cover plate; and

[0024] A moisture-proof cap is detachably connected to the main body and forms a sealed cavity with the main body to accommodate the return spring; the inner peripheral wall of the moisture-proof cap is provided with a sliding groove, and the protrusion is slidably connected in the sliding groove.

[0025] In this invention, the explosion-proof vent valve includes a main body, a movable frame, a breathable membrane, a return spring, and a moisture-proof cap. The main body is fixed to the side wall of the battery box and has a mounting hole. A vent for the battery box is located around the mounting hole. The movable frame includes a movable cover plate and a guide rod. The movable cover plate is mounted on the guide rod, which is slidably connected to the wall of the mounting hole. The movable cover plate covers the vent. A protrusion is formed at the end of the guide rod away from the movable cover plate. The breathable membrane is located on the side of the movable cover plate away from the vent. The return spring is sleeved on the guide rod, with its two ends abutting against the side of the main body away from the movable cover plate and the end of the guide rod away from the movable cover plate, respectively. The moisture-proof cap is detachably connected to the main body and forms a sealed cavity to accommodate the return spring. A groove is formed on the inner circumferential wall of the moisture-proof cap, and the protrusion is slidably connected within the groove. In this invention, the sliding fit between the guide rod and the mounting hole, as well as the limiting effect of the protrusion and the groove, effectively prevents the end of the guide rod from shaking. Compared with existing technologies, this structure solves the jamming problem caused by guide rod wobbling, ensures reliable reset of the movable frame, and improves the sealing reliability of the explosion-proof vent valve. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 A schematic diagram of a structure of an embodiment of the explosion-proof vent valve provided by this utility model;

[0028] Figure 2 Exploded view of an explosion-proof vent valve;

[0029] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0030] Figure 4 This is a cross-sectional view of an explosion-proof vent valve.

[0031] Explanation of icon numbers:

[0032] 1 main body 214 Connecting column 11 Installation ribs 22 Guide rod 1a Mounting holes 221 convex ring 1b First annular groove 2211 convex part 1c Threaded hole 3 breathable membrane 1d hollow area 4 Return spring 2 movable skeleton 5 Moisture-proof hat 21 movable cover plate 5a Sealed cavity 211 First board 5b chute 212 Second board 6 sealing ring 213 Third Board 6a Second annular groove

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0035] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] To solve the above problems, this utility model proposes an explosion-proof vent valve 1000. Figure 1 , Figure 2 , Figure 3 as well as Figure 4 A schematic diagram of the structure of an embodiment of the explosion-proof vent valve 1000 provided by this utility model.

[0038] Please refer to Figure 1 , Figure 2 , Figure 3 as well as Figure 4 This utility model proposes an explosion-proof vent valve 1000, including a main body 1, a movable frame 2, a breathable membrane 3, a return spring 4, and a moisture-proof cap 5; the main body 1 is used to fix it to the side wall of the battery box, and the main body 1 has a mounting hole 1a, with an explosion vent for the battery box circumferentially provided in the mounting hole 1a; the movable frame 2 includes a movable cover plate 21 and a guide rod 22, the movable cover plate 21 is disposed on the guide rod 22, the guide rod 22 is slidably connected to the hole wall of the mounting hole 1a, and the movable cover plate 21 covers the explosion vent; the guide rod 22 is away from the movable frame 1000. One end of the movable cover plate 21 has a protrusion 2211; the breathable membrane 3 is provided on the side of the movable cover plate 21 away from the explosion vent; the return spring 4 is sleeved on the guide rod 22, and the two ends of the return spring 4 abut against the side of the main body 1 away from the movable cover plate 21 and the end of the guide rod 22 away from the movable cover plate 21, respectively; the moisture-proof cap 5 is detachably connected to the main body 1 and forms a sealed cavity 5a with the main body 1 to accommodate the return spring 4; the inner peripheral wall of the moisture-proof cap 5 is provided with a sliding groove 5b, and the protrusion 2211 is slidably connected in the sliding groove 5b.

[0039] The breathable membrane 3 has a microporous structure that allows only gas molecules to pass through, but not liquid molecules or other dust particles, thus achieving a balance between the gases inside and outside the enclosure. When the gas pressure inside the enclosure exceeds a critical value, the movable frame 2 is pushed to detach the breathable membrane 3 from the explosion vent, allowing the high-pressure gas and electrolyte inside the enclosure to be released through the explosion vent, ensuring battery safety. When the internal gas pressure of the battery increases, the gas is discharged through the breathable membrane 3 and the explosion vent, preventing the battery enclosure from exploding. The movable design of the movable frame 2 allows for appropriate displacement when the gas pressure increases, further promoting gas discharge.

[0040] In the technical solution of this utility model, the sliding fit between the guide rod 22 and the mounting hole 1a, and the limiting effect of the protrusion 2211 and the groove 5b, effectively prevent the end of the guide rod 22 from shaking. Compared with the prior art, this structure solves the jamming problem caused by the shaking of the guide rod 22, ensures the reliable reset of the movable frame 2, and improves the sealing reliability of the explosion-proof vent valve 1000. At the same time, the sealing cavity 5a formed by the moisture-proof cap 5 protects the reset spring 4 from electrolyte corrosion, extending the service life of the valve.

[0041] In one embodiment of the present invention, the movable cover plate 21 is composed of a first plate 211, a second plate 212 and a third plate 213 stacked together. The third plate 213 is the plate closest to the main body 1, and the third plate 213 is provided with a connecting post 214 facing the guide rod 22.

[0042] The explosion-proof vent valve 1000 proposed in this application has a closed state and an open state. When the pressure inside the battery box does not exceed the pressure threshold set by the valve body, the explosion-proof vent valve 1000 is in the closed state. In the closed state, the explosion-proof vent valve 1000 can still communicate with the outside gas. Specifically, the guide rod 22 is a hollow structure with a first channel inside that communicates with the inside of the battery box. The other end of the guide rod 22 is connected to the connecting post 214 of the movable cover plate 21. The connecting post 214 has a second channel that communicates with the first channel inside the guide rod 22. The end of the second channel away from the first channel communicates with the vent membrane 3. The vent membrane 3 is a third plate 213 in the movable cover plate 21. The third plate 213 has multiple exhaust grooves 213a on the side facing away from the second channel. When the gas pressure inside the battery box is too high and reaches the pressure threshold, the gas can pass through the first channel, the second channel, and then through the vent membrane 3 and be discharged from the exhaust grooves 213a, thereby achieving pressure balance with the outside.

[0043] In one embodiment of the present invention, a protruding ring 221 is formed at the end of the guide rod 22 away from the movable cover plate 21, and the two ends of the return spring 4 respectively abut against the side of the main body 1 away from the movable cover plate 21 and the side of the protruding ring 221 facing the movable cover plate 21; the protrusion 2211 is formed on the outer peripheral wall of the protruding ring 221.

[0044] Specifically, the convex ring 221 is an annular protrusion structure with an outer diameter larger than that of the guide rod 22, thus forming a spring limiting surface. The protrusion 2211 can be configured as a rectangular protrusion, a hemispherical protrusion, or a wedge-shaped slider, preferably using a symmetrically distributed wedge structure to enhance guiding stability. The convex ring 221 and the guide rod 22 can be manufactured using an integral molding process, or fixed by welding, threaded connection, or other methods. The cross-sectional shape of the groove 5b matches that of the protrusion 2211, for example, using a T-groove, dovetail groove, or rectangular groove structure.

[0045] The convex ring 221 structure provides a precise mounting and positioning surface for the return spring 4, ensuring that the line of action of the spring force always coincides with the axis of the guide rod 22. While maintaining the original pressure relief function, it significantly improves the return reliability of the moving parts.

[0046] In one embodiment of the present invention, the outer peripheral wall of the convex ring 221 is formed with two oppositely arranged protrusions 2211, and the moisture-proof cap 5 is provided with two oppositely arranged sliding grooves 5b, each of the protrusions 2211 being slidably connected to the corresponding sliding groove 5b.

[0047] The symmetrically distributed protrusions 2211, in conjunction with the sliding groove 5b, enable precise guidance of the movable frame 2 under the force of the return spring 4. When the internal pressure of the battery box is abnormal, the movable cover 21 is pressed, pushing the guide rod 22 to move axially, and the protrusions 2211 slide linearly along the sliding groove 5b, preventing the end of the guide rod 22 from wobbling due to unilateral force. After depressurization, the return spring 4 pushes the protrusions 2211 to accurately return to their original position along the sliding groove 5b, preventing the movable frame 2 from jamming. Compared with the existing single-point guiding structure, the symmetrical layout of the double protrusions 2211 makes the force distribution more uniform, effectively solving the problem of wobbling at the end of the guide rod 22 caused by the short mounting hole 1a, and ensuring the reliability of repeated sealing of the explosion-proof vent valve 1000.

[0048] In one embodiment of the present invention, the movable cover plate 21 is provided with a connecting post 214 protruding toward the guide rod 22, and the movable cover plate 21 is threadedly connected to the guide rod 22 through the connecting post 214; at least a portion of the structure of the connecting post 214 is located inside the guide rod 22.

[0049] Specifically, the connecting post 214 can be cylindrical or prismatic. Threaded connections include, but are not limited to, M3-M6 standard metric threads, UNC / UNF American standard threads, or self-tapping threads. The recommended length of the connecting post 214 extending into the limiting rod is 3-8 mm, and the extended end can be machined into a tapered guide structure for easy assembly. As a preferred embodiment, a threaded bushing can be provided inside the limiting rod, with the connecting post 214 forming a threaded fit with the bushing, thereby improving the wear resistance of the connection structure.

[0050] The movable plate and the limiting rod are adjustablely fixed via a threaded connection, with the built-in design of the connecting column 214 effectively reducing the overall height. When the mounting hole 1a of the main body 1 is too short, causing the end of the guide rod 22 to wobble, the threaded connection structure ensures that the movable frame 2 always maintains axial alignment, avoiding jamming problems caused by misalignment. Compared with the existing technology that uses an integral frame or welding fixation, this solution ensures structural strength, facilitates disassembly and maintenance, and allows for precise control of the initial gap between the movable cover plate 21 and the explosion vent by adjusting the thread insertion depth.

[0051] In one embodiment of the present invention, the main body 1 has a first annular groove 1b on the side facing the movable frame 2, and the explosion-proof vent valve 1000 further includes a sealing ring 6, which is disposed in the first annular groove 1b and abuts against the movable cover plate 21 and the bottom wall of the first annular groove 1b respectively.

[0052] Specifically, the cross-sectional shape of the sealing ring 6 matches the groove, and it can be designed as an O-ring, X-ring, or square ring. The outer diameter of the sealing ring 6 in its free state is slightly larger than the width of the groove, achieving a tight fit through compression deformation.

[0053] By setting a sealing structure between the main body 1 and the movable cover plate 21, the sealing failure problem caused by the shaking of the guide rod 22 in traditional explosion-proof valves is effectively solved. When the internal air pressure is normal, the sealing ring 6 forms a double sealing barrier under compression: radial sealing is achieved through the interference fit between the sealing ring 6 and the side wall of the groove, and axial sealing is achieved through the elastic contact between the sealing ring 6 and the movable cover plate 21. During the depressurization process, the sealing ring 6 remains in contact with the bottom of the groove when the movable cover plate 21 is lifted, preventing external contaminants from entering. Compared with the prior art, this design significantly improves the sealing reliability of the valve body under vibration environment while maintaining the original depressurization function, and does not affect the normal operation of the return spring 4.

[0054] In one embodiment of the present invention, the sealing ring 6 has a top surface and a bottom surface that are disposed opposite to each other. The top surface abuts against the movable cover plate 21, and the bottom surface abuts against the bottom wall of the first annular groove 1b. A second annular groove 6a is provided on both the top surface and the bottom surface.

[0055] The sealing ring 6, consisting of the first annular groove 1b and the double second annular grooves 6a, forms a "double labyrinth + elastic rebound" seal between the movable cover plate 21 and the main body 1. The first annular groove 1b provides compression margin, and the double second annular grooves 6a generate two independent sealing lines, raising the dustproof, waterproof, and salt spray resistance levels to IP67 / IP68. It maintains its resilience under thermal cycling conditions of -40℃ to 125℃, preventing short circuits or corrosion caused by daily moisture and dust infiltration, and ensuring that zero leakage can be restored instantly after pressure relief, reducing seal failure and maintenance frequency.

[0056] Please refer to Figure 2 In one embodiment of the present invention, the main body 1 is formed with a mounting rib 11, the mounting rib 11 forms a mounting hole 1a, and a hollow area 1d is formed around the periphery of the mounting rib 11.

[0057] By setting a single mounting rib 11 on the main body 1 to form a mounting hole 1a, and designing the periphery of the mounting rib 11 as a hollow area 1d, compared with the existing technology that uses multiple ribs or solid boss structures, the effective air-permeable area of ​​the breathable membrane 3 is significantly increased while ensuring the structural strength of the main body 1, thereby improving the air permeability. At the same time, the simple structure of the single mounting rib 11 makes it easy to clamp and fix using tooling, effectively reducing assembly difficulty and production costs.

[0058] In one embodiment of this utility model, the breathable membrane 3 is an expanded polytetrafluoroethylene membrane.

[0059] Expanded polytetrafluoroethylene (ePTFE) membrane features a three-dimensional microfiber network structure with pore sizes ranging from 0.1 to 1.0 μm. This is 2-3 orders of magnitude larger than gaseous molecules (approximately 0.3 nm), but 1-2 orders of magnitude smaller than liquid water droplets (>1000 μm) and typical dust particles (>10 μm). Thanks to its "size sieving" effect, when a micro-pressure difference of ±3-5 kPa arises within the enclosure due to temperature or altitude variations, gas molecules can freely diffuse along the micropores, achieving bidirectional isobaric equilibrium. Meanwhile, water, electrolyte droplets, and dust are blocked because surface tension prevents them from wetting the hydrophobic membrane surface, achieving IP67 waterproof and breathable rating. The low surface energy of the ePTFE microfibers and droplet contact angle >160° further prevent capillary permeation. Simultaneously, the membrane material is heat-resistant up to 260℃ and resistant to electrolyte corrosion, maintaining a certain amount of air permeability over a long period, ensuring that the explosion-proof vent valve 1000 continuously balances internal and external pressures without failure even when closed.

[0060] Besides nylon, the moisture-proof cap 5 can also be made of engineering plastics such as polypropylene and polycarbonate. In one embodiment of this utility model, the moisture-proof cap 5 is made of nylon. The choice of nylon material is based on its corrosion resistance, mechanical strength, and cost advantages, and it can effectively protect the internal return spring 4 in a humid environment. By adding the nylon moisture-proof cap 5 to form a closed cavity, the return spring 4 is isolated from the external environment. When the battery box is in a high-humidity environment, the sealed cavity 5a can prevent moisture from contacting the return spring 4, avoiding the spring from losing its elasticity or becoming stuck due to corrosion.

[0061] It is understood that the material of the moisture-proof cap 5 can be metal, nylon, or other corrosion-resistant materials. In one embodiment of this utility model, the material of the moisture-proof cap 5 is nylon.

[0062] Nylon, as the material of the moisture-proof cap 5, possesses excellent mechanical strength and wear resistance, capable of withstanding the mechanical stress generated by the repeated compression and release of the return spring 4. The chemical stability of nylon allows it to resist corrosion from electrolyte vapors inside the battery case, preventing seal failure due to material degradation. Nylon can be processed using injection molding, allowing for precise control of the dimensional accuracy of the inner peripheral wall groove 5b of the moisture-proof cap 5, ensuring smooth sliding of the protrusion 2211 within the groove 5b. As a preferred embodiment, PA66 nylon can be used, with a melting point of 265°C, capable of withstanding the high-temperature environment generated during battery thermal runaway.

[0063] By using nylon to make the moisture-proof cap 5, the problem of cracking and leakage of the sealing cavity 5a caused by long-term mechanical stress in composite material moisture-proof caps 5 is solved. The high strength of nylon can effectively restrain the radial deformation of the return spring 4, avoiding the jamming of the movable skeleton 2 caused by spring deflection. Compared with metal materials, nylon has a lighter weight and better processability, reducing production costs while ensuring structural strength.

[0064] It is understood that the material of the main body 1 can be metal, nylon, or other corrosion-resistant materials. In one embodiment of this utility model, the material of the main body 1 is nylon.

[0065] Specifically, when nylon is used as the material for the main body 1, it can be produced using injection molding. Nylon 66 or nylon 6 can have its mechanical strength enhanced by adding 30% glass fiber. As a preferred embodiment, when the main body 1 and the moisture-proof cap 5 are made of the same nylon material, their coefficients of thermal expansion are identical, maintaining the stability of the mating structure during temperature changes. Furthermore, the nylon material can be made to meet the UL94 V-0 flame retardant standard by adding flame retardants.

[0066] Therefore, the nylon body 1 maintains structural stability under high-temperature conditions in the battery box. Nylon's chemical corrosion resistance prevents electrolyte erosion, and its insulation properties prevent the formation of an electrochemical corrosion circuit. Compared to the metal body 1, the nylon body 1 reduces weight while absorbing impact energy during the movement of the movable frame 2 through elastic deformation, preventing jamming at the end of the guide rod 22 due to rigid collisions. Specifically, when the guide rod 22 wobbles within the mounting hole 1a, the nylon hole wall provides a buffer space through elastic deformation, preventing motion interference caused by hard metal-to-metal contact in the movable frame 2, and ensuring that the reset spring 4 can properly push the movable cover 21 back to its sealing position after pressure relief.

[0067] This utility model also proposes a battery box, which includes the aforementioned explosion-proof vent valve 1000. The specific structure of the explosion-proof vent valve 1000 is as described in the above embodiments. Since this battery box adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The explosion-proof vent valve 1000 is installed at the explosion vent position on the side wall of the battery box and is connected to the box body through a threaded hole 1c1c. The lower bottom surface of the main body 1 abuts against the side wall of the battery box. To prevent external gas, liquid, or dust from entering the box body through the gap between the main body 1 and the side wall of the battery box, another sealing ring is provided on the side of the main body 1 facing away from the vent membrane 3.

[0068] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An explosion-proof vent valve, characterized in that, include: The main body is used to fix it to the side wall of the battery box. The main body has a mounting hole and the mounting hole is provided with a vent for the battery box around its circumference. A movable frame includes a movable cover plate and a guide rod. The movable cover plate is disposed on the guide rod, and the guide rod is slidably connected to the wall of the mounting hole. The movable cover plate covers the explosion vent. A protrusion is formed at the end of the guide rod away from the movable cover plate. A breathable membrane is provided on the side of the movable cover plate opposite to the explosion vent. A return spring, wherein the return spring is sleeved on the guide rod, and the two ends of the return spring respectively abut against the side of the main body away from the movable cover plate and the end of the guide rod away from the movable cover plate; and A moisture-proof cap is detachably connected to the main body and forms a sealed cavity with the main body to accommodate the return spring; the inner peripheral wall of the moisture-proof cap is provided with a sliding groove, and the protrusion is slidably connected in the sliding groove.

2. The explosion-proof vent valve as described in claim 1, characterized in that, The guide rod has a protruding ring at one end away from the movable cover plate, and the two ends of the return spring abut against the side of the main body away from the movable cover plate and the side of the protruding ring facing the movable cover plate, respectively; the protrusion is formed on the outer peripheral wall of the protruding ring.

3. The explosion-proof vent valve as described in claim 2, characterized in that, The outer peripheral wall of the convex ring has two oppositely arranged protrusions, and the moisture-proof cap has two oppositely arranged sliding grooves, with each protrusion slidably connected to the corresponding sliding groove.

4. The explosion-proof vent valve as described in claim 1, characterized in that, The movable cover plate has a connecting post protruding towards the guide rod, and the movable cover plate is threadedly connected to the guide rod through the connecting post; at least a portion of the structure of the connecting post is located inside the guide rod.

5. The explosion-proof vent valve as described in claim 1, characterized in that, The main body has a first annular groove on the side facing the movable frame. The explosion-proof vent valve also includes a sealing ring, which is located in the first annular groove and abuts against the movable cover plate and the bottom wall of the first annular groove.

6. The explosion-proof vent valve as described in claim 5, characterized in that, The sealing ring has a top surface and a bottom surface that are arranged opposite to each other. The top surface abuts against the movable cover plate, and the bottom surface abuts against the bottom wall of the first annular groove. A second annular groove is formed on both the top surface and the bottom surface.

7. The explosion-proof vent valve as described in claim 1, characterized in that, The main body has mounting ribs, which form mounting holes, and the periphery of the mounting ribs has a hollow area.

8. The explosion-proof vent valve as described in claim 1, characterized in that, The waterproof cap is made of nylon.

9. The explosion-proof vent valve as described in any one of claims 1 to 8, characterized in that, The main body is made of nylon.

10. A battery box, characterized in that, Includes the explosion-proof vent valve as described in any one of claims 1 to 9.

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