Explosion-proof valve exhaust port integrated inner sealing ring structure

Abstract

The utility model relates to the technical fields of battery explosion -proof valve, concretely is explosion -proof valve exhaust port integrated inner sealing washer structure, including valve body, the exhaust port of opening on valve body, the sealing cover slidingly connected in the center of valve body, with the guide rod of valve bonnet middle part screw connection and the spring of setting on the guide rod, be equipped with sealing washer between sealing cover and valve body, sealing washer and sealing cover fixed connection, the recess is equipped with in the end of sealing washer away from sealing cover, the recess is V type groove, and the bottom of V type groove is circular arc transition. This scheme can avoid the problem that the sealing washer structure of conventional battery explosion -proof valve is easy to break the ring when exhausting, and make the sealing washer can accurate reset after exhausting, and realize double -sealed contact surface, can make up the slight deformation gap of sealing washer, improve sealing performance, prolong explosion -proof valve life, guarantee the stable sealing effect.

Description

Technical Field

[0001] This utility model relates to the technical field of battery explosion-proof valves, specifically to an integrated inner sealing ring structure for the exhaust port of the explosion-proof valve. Background Technology

[0002] As battery applications continue to expand, from portable electronic devices to large systems such as electric vehicles and energy storage power stations, battery safety is receiving increasing attention. During charging and discharging, various factors such as internal chemical reactions, overcharging, overheating, and short circuits can generate a large amount of gas, causing a rapid increase in internal battery pressure. If this pressure cannot be released in time, it can easily lead to a battery explosion, causing serious safety accidents and property damage. Therefore, the structural design of battery explosion-proof valves plays a crucial role in ensuring battery safety.

[0003] The existing technology, "An Explosion-Proof Valve" (Announcement No.: CN220456583U), discloses the structure of a conventional battery explosion-proof valve. It uses the elastic force of a spring element to seal the vent of the battery pack housing with a valve cover, and a sealing ring is placed between the valve cover and the vent. When the internal air pressure of the battery housing is too high, it overcomes the elastic force of the spring element and pushes the valve cover, causing the valve cover to detach from the sealing ring and creating a gap. The internal gas then escapes to the outside of the housing through this gap. When the internal air pressure drops to a certain level, the elastic force of the spring element re-seals the vent with the valve cover, thus achieving automatic pressure relief and preventing battery explosion. However, this existing technology also has the following technical problems: The sealing effect of an explosion-proof valve is primarily influenced by the sealing ring. In existing technology, the sealing ring is located between the valve body's exhaust port and the sealing block (valve cover). If the internal gas pressure is too high, the sealing ring can easily be blown away from the exhaust port during venting. When the sealing block resets after venting, the sealing ring cannot return to its correct sealing position, resulting in sealing failure. Furthermore, because the sealing ring is made of rubber, the contact points between it and the sealing block can partially adhere during prolonged contact. Therefore, during venting, the movement of the sealing block can cause the sealing ring to move, again preventing it from returning to its correct sealing position after the sealing block resets, leading to sealing failure. Additionally, since the sealing ring's surface is typically cylindrical, a sealing line is formed when the sealing ring is pressed against the sealing cover and the battery pack. Even slight irregular deformation of the sealing ring can create gaps between its surface and the sealing cover and the battery pack, causing sealing failure. Sealing failure allows external moisture, dust, and other impurities to enter the battery pack, leading to electrolyte decomposition, accelerated cell electrode corrosion, or even a short circuit hazard. Utility Model Content

[0004] This utility model provides an integrated inner sealing ring structure for the vent of an explosion-proof valve, which can solve the problem that the sealing ring of the explosion-proof valve in the prior art is prone to falling out of the correct sealing position during the venting process, causing sealing failure. This leads to the intrusion of impurities such as moisture and dust from the outside of the battery pack into the battery pack, causing electrolyte decomposition, accelerated corrosion of the cell electrode, or short circuit hazard.

[0005] This application provides the following technical solution: an integrated inner sealing ring structure for the exhaust port of an explosion-proof valve, including a valve body, an exhaust port opened on the valve body, a sealing cover slidably connected to the center of the valve body, a guide rod threadedly connected to the center of the valve cover, and a spring sleeved on the guide rod; A sealing ring is provided between the sealing cover and the valve body. The sealing ring is fixedly connected to the sealing cover. A groove is provided at the end of the sealing ring away from the sealing cover. The groove is a V-shaped groove with a rounded bottom.

[0006] Beneficial effects: 1. In existing technologies, the sealing ring and sealing cap (sealing block) are separate structures. During exhaust, high-pressure gas easily blows the sealing ring away from the exhaust port, and it is difficult for the sealing ring to return to its correct position during reset. This solution directly and fixedly connects the sealing ring and sealing cap, forming an integral structure that is inseparable. During exhaust, the sealing cap is pushed open by the high-pressure gas, and the sealing ring moves synchronously with the sealing cap, preventing it from being blown away by the gas alone. It also prevents the sealing ring from being pulled away or shifted due to adhesion between the sealing ring and the sealing cap. This fundamentally solves the problem of misalignment of the sealing ring caused by adhesion, ensuring that the sealing ring accurately returns to the sealing position at the exhaust port after each reset, maintaining a stable sealing state. Structurally, this eliminates the problem of separation and misalignment between the sealing ring and the sealing cap, completely avoiding sealing failure caused by this.

[0007] 2. In existing technologies, cylindrical sealing rings only form a single sealing line, and even slight irregular deformation can lead to sealing gaps. In contrast, this solution features a V-groove at the end of the sealing ring furthest from the sealing cap, with a rounded bottom. This structure creates a "double sealing contact surface" between the V-groove and the valve body when the sealing cap compresses the sealing ring. Firstly, the double contact surface significantly increases the sealing contact area compared to a single sealing line. Even with slight irregular deformation of the sealing ring, the two contact surfaces can compensate for each other's gaps, preventing leaks. Secondly, due to the pressure from the sealing ring during long-term use, the V-groove may open under pressure. The rounded bottom design of the V-groove avoids stress concentration in this area, reducing the risk of cracking due to excessive stress at the bottom when the V-groove opens. This prevents the sealing ring from cracking, reducing the compressive force on the solid parts of the sealing ring on both sides of the cracked V-groove and improving sealing stability.

[0008] Furthermore, the sealing ring and the sealing cap are integrally vulcanized.

[0009] Beneficial effects: Integrated vulcanization molding is a process that uses hot pressing to press multiple parts into one piece and then vulcanizes them at high temperatures to bond the chemical bonds between the parts, resulting in a unified and secure connection. This provides excellent tightness and, unlike conventional sealing rings which typically require a recessed groove at the installation location for easy replacement, this solution avoids the need for such a groove, simplifying the structure, reducing costs, and solving the problem of sealing ring detachment that is common in conventional explosion-proof valve structures.

[0010] Furthermore, the V-groove has protrusions on both sides, and the top of the protrusions is rounded.

[0011] Beneficial effects: The top of the raised structure of the V-groove needs to contact the valve body of the explosion-proof valve to form a sealing line. Therefore, based on the rounded transition at the bottom of the V-groove of the sealing ring, the tops of the raised structures on both sides of the V-groove are also made rounded. On the one hand, this improves the fitting accuracy between the sealing ring and the valve body, allowing the raised tops to form a smooth fit with the valve body, eliminating local gaps and improving the sealing effect. On the other hand, the rounded transition can disperse the compressive stress, avoid local deformation caused by stress concentration, and reduce frictional loss when the sealing ring and valve body are in contact, ensuring that the sealing ring maintains its structural integrity for a long time and extending its service life.

[0012] Furthermore, the outer side of the protrusion is a slope.

[0013] Beneficial effects: The outer bevel and V-groove structure of the protrusion make the entire protrusion structure an inverted cone shape. When the sealing cover is pressed against the valve body by the tension spring, the transmission path and distribution of the clamping force on the sealing ring are optimized, so that the clamping force gradually gathers at the top of the protrusion to ensure that the top of the protrusion is in close contact with the valve body, which significantly improves the sealing reliability of the sealing ring. Furthermore, the bottom of the sealing cap is provided with a connecting section, the outer periphery of the connecting section is provided with external threads, the center of the guide rod is provided with an inner hole, the inner wall of the inner hole is provided with internal threads, and the guide rod and the connecting section are fixed by threaded connection.

[0014] Beneficial effects: Since the guide rod is slidably connected to the center of the valve body, the guide rod moves along the valve body and drives the sealing cover to open and close. The bottom connecting section of the sealing cover is fixed to the guide rod by a threaded connection, which can achieve a detachable and stable connection between the two, making it easy to replace and maintain.

[0015] Furthermore, the spring is a compression spring, and the end of the guide rod away from the sealing cover is provided with a step. The spring is sleeved on the rod part of the guide rod, one end of the spring abuts against the end face of the middle part of the valve body, and the other end of the spring abuts against the step on the guide rod.

[0016] Beneficial effects: By using a compression spring and installing it in contact with the middle end face of the valve body via the guide rod step, the axial elastic force of the compression spring can provide a continuous and stable clamping force to the sealing cover, ensuring that the sealing ring is always tightly fitted to the valve body and blocks the exhaust port. After the pressure inside the valve body is released, the spring force can also cause the sealing cover to automatically reset. On the other hand, the compression spring sleeved on the rod can form a precise radial limit for the compression spring, preventing the compression spring from shifting or tilting during extension and retraction. This ensures that the spring force always acts on the sealing cover along the axial direction of the guide rod, avoiding uneven force on the sealing cover and localized poor sealing of the sealing ring due to spring misalignment, thereby improving sealing performance. Attached Figure Description

[0017] Figure 1 This is the main structural view of the present invention.

[0018] Figure 2 for Figure 1 Front view of the central sealing cap.

[0019] Figure 3 for Figure 2 An enlarged view of the connection between the middle sealing ring and the sealing cap.

[0020] The markings in the accompanying drawings include: sealing cap 1, connecting section 101, sealing ring 2, V-groove 201, protrusion 202, bevel 203, valve body 3, exhaust port 4, guide sleeve 5, spring 6, guide rod 7, and step 8. Detailed Implementation

[0021] The following detailed description illustrates the specific implementation method: Example 1 like Figures 1 to 3 As shown, the explosion-proof valve exhaust port integrated inner sealing ring 2 structure includes a valve body 3, an exhaust port 4 opened on the rib plate surface of the valve body 3, a sealing cover 1 slidably connected to the center of the valve body 3, a guide rod 7 threadedly connected to the middle of the valve cover, and a spring 6 sleeved on the guide rod 7.

[0022] A sealing ring 2 is provided between the sealing cap 1 and the valve body 3. The sealing ring 2 and the sealing cap 1 are fixedly connected by integral vulcanization molding. Integral vulcanization molding is achieved by hot pressing multiple parts into one piece and performing a vulcanization reaction at high temperature, so that the chemical bonds between the parts are combined to achieve integral fixation, which has very good connection tightness. The end of the sealing ring 2 away from the sealing cap 1 has a groove, which is a V-shaped groove 201. The bottom of the V-shaped groove 201 is rounded, and there are protrusions 202 on both sides of the V-shaped groove 201. The top of the protrusions 202 is rounded, and the outer side of the protrusions 202 is set as a slope.

[0023] like Figure 1 and Figure 2As shown, the bottom of the sealing cover 1 has a connecting section 101 with external threads on its outer periphery. The center of the guide rod 7 has an inner hole with internal threads on its inner wall. The guide rod 7 and the connecting section 101 are fixed together by the threaded connection, making the guide rod 7 and the sealing cover 1 a single unit. The center of the valve body 3 has a mounting hole, and the guide rod 7 is slidably connected in the mounting hole. The end of the guide rod 7 away from the sealing cover 1 has a step 8. The spring 6 is sleeved on the rod of the guide rod 7. One end of the spring 6 abuts against the end face of the middle part of the valve body 3, and the other end of the spring 6 abuts against the step 8 on the guide rod 7. In this embodiment, the spring 6 is a compression spring, driven by the elastic force of the spring 6 after compression. Figure 1 The guide rod 7 moves downward, causing the sealing ring 2 to press down on the valve body 3, thereby sealing the outer ring of the exhaust port 4 on the valve body 3. A guide sleeve 5 is also provided outside the guide rod 7. The opening of the guide sleeve 5 has an internal thread, which can be threaded to the boss in the middle of the valve body 3, thereby covering the entire spring 6 to protect the spring 6.

[0024] The usage method of this structure is as follows: The valve body 3 has a threaded hole for installation at the vent of the battery pack. The guide rod 7 is located on one side inside the battery pack. When the air pressure in the battery pack increases, gas will escape from... Figure 1 The exhaust port 4 on the valve body 3 discharges upward. When the gas pressure is greater than the elastic force of the spring 6, it will push the sealing cover 1 to move upward. The protrusion 202 of the sealing ring 2 below the sealing cover 1 will disengage from the valve body 3. The gas will be discharged from the gap between the sealing ring 2 and the valve body 3 to the outside of the valve body 3. When the gas pressure in the battery pack returns to the normal range, when the gas pressure is less than the elastic force of the spring 6, the elastic force of the spring 6 will push the guide rod 7 downward again, thereby driving the sealing cover 1 to reset. The protrusion 202 of the sealing ring 2 will press the valve body 3 again to form a seal on the exhaust port 4.

[0025] This solution directly and fixedly connects the sealing ring 2 and the sealing cover 1, forming an integral structure that is inseparable. When venting, the sealing cover 1 is pushed open by the high-pressure gas, and the sealing ring 2 moves synchronously with the sealing cover 1, preventing it from being blown away by the gas alone. It also prevents the sealing ring 2 from being pulled away or shifted due to the adhesion between the sealing ring 2 and the sealing cover 1. This fundamentally solves the problem of misalignment of the sealing ring 2 caused by adhesion, ensuring that the sealing ring 2 can accurately return to the sealing position of the exhaust port 4 after each reset of the sealing cover 1, maintaining a stable sealing state. Structurally, this eliminates the problem of separation and misalignment between the sealing ring 2 and the sealing cover 1, completely avoiding the sealing failure problem caused by this. In addition, the sealing ring 2 of this design has a V-groove 201 at the end away from the sealing cover 1, and the bottom of the V-groove 201 is rounded. This structure allows the top of the protrusion 202 to contact the valve body 3 when the sealing cover 1 presses the sealing ring 2, forming a "double sealing contact surface". On the one hand, the double contact surface significantly increases the sealing contact area compared to the single sealing line. Even if the sealing ring 2 has slight irregular deformation, the two contact surfaces can compensate for the gap and avoid the appearance of leaks. On the other hand, since the sealing ring 2 will open due to the pressure of the sealing ring 2 during long-term use, the rounded transition design at the bottom of the V-groove 201 can avoid stress concentration in this part, reduce the cracking of the V-groove 201 caused by excessive stress at the bottom of the groove when the V-groove 201 opens, and avoid the reduced pressing force on the protrusions 202 on both sides of the cracked V-groove 201, thus improving the sealing stability.

[0026] The above are merely embodiments of this utility model, and the utility model is not limited to the field covered by this embodiment. Commonly known structures and characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An integrated inner sealing ring structure for the exhaust port of an explosion-proof valve, characterized in that: The explosion-proof valve exhaust port integrated internal sealing ring structure includes a valve body, an exhaust port opened on the valve body, a sealing cover slidably connected to the center of the valve body, a guide rod threadedly connected to the center of the valve cover, and a spring sleeved on the guide rod. A sealing ring is provided between the sealing cover and the valve body. The sealing ring is fixedly connected to the sealing cover. A groove is provided at the end of the sealing ring away from the sealing cover. The groove is a V-shaped groove with a rounded bottom.

2. The integrated inner sealing ring structure for the explosion-proof valve exhaust port according to claim 1, characterized in that: The sealing ring and the sealing cap are integrally vulcanized.

3. The integrated inner sealing ring structure for the explosion-proof valve exhaust port according to claim 2, characterized in that: The V-groove has protrusions on both sides, and the top of the protrusions is rounded.

4. The integrated inner sealing ring structure for the explosion-proof valve exhaust port according to claim 3, characterized in that: The outer side of the protrusion is a slope.

5. The integrated inner sealing ring structure for the explosion-proof valve exhaust port according to claim 4, characterized in that: The bottom of the sealing cap is provided with a connecting section, the outer periphery of the connecting section is provided with external threads, the center of the guide rod is provided with an inner hole, the inner wall of the inner hole is provided with internal threads, and the guide rod and the connecting section are fixed by threaded connection.

6. The integrated inner sealing ring structure for the explosion-proof valve exhaust port according to claim 5, characterized in that: The spring is a compression spring. The end of the guide rod away from the sealing cover is provided with a step. The spring is sleeved on the rod part of the guide rod. One end of the spring abuts against the end face of the middle part of the valve body, and the other end of the spring abuts against the step on the guide rod.

Images