Pressure release valve and sealing equipment

Abstract

The utility model relates to the technical field of valves, in particular to a pressure release valve and sealing equipment, the pressure release valve comprises a valve body and a valve cover assembly, the valve body comprises a main body, an elastic piece and a fixing piece, the main body is provided with a through hole, and the valve cover assembly and the fixing piece are respectively arranged on two opposite sides of the through hole. The valve cover assembly comprises a cover plate and a sealing piece which are sequentially arranged towards the through hole, the valve cover assembly can make contact with or be separated from the main body to close or open the through hole, and the two ends of the elastic piece are connected with the sealing piece and the fixing piece respectively. When the valve cover assembly is separated relative to the main body, gas is discharged; after the air pressure is balanced, the elastic piece drives the valve deck assembly to reset to achieve sealing again, the elastic piece is even and adjustable in reset force, it is ensured that the valve deck assembly is stably opened or closed when the pressure fluctuates, the sealing piece is directly subjected to the pulling force effect of the elastic piece, and when the pressure does not exceed the standard, the sealing piece is kept in a sealed attaching state to prevent mistaken opening. And a dynamic balance sealing structure is formed by matching with the elastic piece, so that the structural stability and the performance reliability of the pressure release valve are improved.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a pressure relief valve and a sealing device. Background Technology

[0002] Common energy storage devices, such as new energy battery packs and energy storage equipment, require a sealed internal structure to prevent external environmental factors from interfering with internal components. However, during use, factors such as temperature rise and electrochemical reactions producing gas may occur inside the energy storage device, leading to increased internal pressure. If the gas is not released in time, a sudden pressure surge can easily cause an accident. As a solution, a pressure relief valve can open to release gas when the internal pressure of the energy storage device exceeds a threshold. However, the structural stability of existing pressure relief valves is insufficient to meet the higher standards of user requirements. Utility Model Content

[0003] To solve the above problems, this utility model provides a pressure relief valve and a sealing device.

[0004] To solve the above-mentioned technical problems, this utility model provides a pressure relief valve in one embodiment. The pressure relief valve includes a valve body and a valve cover assembly. The valve body includes a main body, an elastic element, and a fixing element. The main body has a through hole. The valve cover assembly and the fixing element are respectively disposed on opposite sides of the through hole. The valve cover assembly includes a cover plate and a sealing element arranged sequentially facing the through hole. The valve cover assembly can contact or separate from the main body to realize the closure or opening of the through hole. The two ends of the elastic element are respectively connected to the sealing element and the fixing element.

[0005] Preferably, the elastic element is a tension spring.

[0006] Preferably, the main body includes a sealing portion disposed near the side of the cover plate, and in a radial direction perpendicular to the axial direction of the through hole, the radial dimension of the cover plate is greater than or equal to the radial dimension of the sealing portion.

[0007] Preferably, the cover plate has a first flange on the side facing the sealing part, the sealing part has a first step on the side facing the cover plate, and a first gap is left between the first flange and the first step; a second step is provided inside the main body, and a second gap is left between the sealing element and the second step.

[0008] Preferably, the elastic element is disposed in the through hole, the fixing element is fixedly connected to the main body, and the end of the fixing element away from the elastic element is flush with the end of the main body away from the valve cover assembly; the side of the fixing element facing the main body is provided with a second flange, and the side of the main body facing the fixing element is provided with a third limiting step, and the second flange abuts against the third limiting step.

[0009] Preferably, the valve cover assembly further includes a stainless steel sheet sandwiched between the cover plate and the seal, wherein the cover plate is fixedly connected to the stainless steel sheet and the cover plate is fixedly connected to the seal.

[0010] Preferably, one of the cover plate and the stainless steel sheet is provided with a limiting block, and the other is provided with a limiting hole, wherein the limiting block and the limiting hole are connected by interference fit; the cover plate and the sealing element are connected by interference fit, adhesive, thread, snap-fit ​​or riveting.

[0011] Preferably, the valve body further includes an inner sealing ring, and an inner sealing groove is formed in the main body. The inner sealing ring is disposed in the inner sealing groove. When the valve cover assembly contacts the main body, the sealing element abuts against the inner sealing ring; and / or, the valve body further includes a lower sealing ring, and a lower sealing groove is formed at one end of the main body away from the valve cover assembly. The lower sealing ring is disposed in the lower sealing groove.

[0012] Preferably, the sealing element is further provided with a venting component, through which the gas in the through hole reaches the outside of the pressure relief valve.

[0013] To solve the above-mentioned technical problems, this utility model provides a sealing device in another embodiment. The sealing device includes a sealing housing and the pressure relief valve described above. The sealing device has an internal cavity, and the sealing housing has an opening that connects the cavity to the outside. The pressure relief valve is located at the opening and closes the opening.

[0014] Compared with the prior art, the pressure relief valve and sealing device of this utility model have the following advantages:

[0015] 1. In one embodiment of this utility model, the pressure relief valve includes a valve body and a valve cover assembly. The valve body includes a main body, an elastic element, and a fixing element. The main body has a through hole. The valve cover assembly and the fixing element are respectively disposed on opposite sides of the through hole. The valve cover assembly includes a cover plate and a sealing element arranged sequentially facing the through hole. The valve cover assembly can contact or separate from the main body to close or open the through hole. The two ends of the elastic element are respectively connected to the sealing element and the fixing element. The through hole serves as a channel for gas discharge. When the gas pressure inside the energy storage device is too high, the valve cover assembly is pushed open, separating from the main body, and the gas is discharged through the through hole from the gap between the main body and the valve cover assembly. After the air pressure is rebalanced, the elastic element is connected to a sealing element and a fixing element at both ends. The sealing element seals the through hole, and the fixing element fixes one end of the elastic element. This ensures that only the end of the elastic element connected to the sealing element moves with the valve cover assembly. The deformation of the elastic element occurs only in a single axial direction, preventing force dispersion or displacement. The reset force of the elastic element drives the valve cover assembly to reset and re-seal. The elastic element can provide a uniform and adjustable reset force, ensuring that the valve cover assembly opens or closes smoothly during pressure fluctuations. The sealing element is directly subjected to the tension of the elastic element, maintaining a sealed fit when the pressure is not exceeded, preventing accidental opening. It also works with the elastic element to form a dynamic balance sealing structure, improving the structural stability and performance reliability of the pressure relief valve.

[0016] 2. In one embodiment of this utility model, the elastic element is a tension spring. The tension spring bears axial tension. When the gas pressure inside the energy storage device is too high, the gas pressure forces the valve cover assembly to separate from the main body, the tension spring stretches, and the coil spacing of the tension spring increases; after the gas is discharged, the tension spring recovers its original length by contraction, releasing elastic potential energy. Compared with compression springs, which require precise guiding structures such as guide rods to prevent bending or lateral displacement of the elastic element, increasing the structural complexity and cost of the pressure relief valve, tension springs can be directly connected to the sealing and fixing parts, reducing structural complexity. The tension of the tension spring is linearly related to the elongation, which facilitates accurate calculation of the pressure relief threshold, while compression springs have nonlinear force characteristics in the compressed state, which can easily affect the pressure relief accuracy. The stable tension of the tension spring allows the sealing element to quickly and accurately reset after pressure relief, avoiding the problem of incomplete reset that may occur with compression springs, further improving the performance reliability of the pressure relief valve.

[0017] 3. In one embodiment of this utility model, the main body includes a sealing part disposed near the cover plate. In the radial direction perpendicular to the axial direction of the through hole, the radial dimension of the cover plate is greater than or equal to the radial dimension of the sealing part. Because the radial dimension of the cover plate is greater than or equal to the radial dimension of the sealing part, the cover plate covers the sealing part. Existing designs are prone to mud adhesion or dust accumulation under complex and harsh working conditions, affecting the pressure relief opening and sealing functions. The covering design of the cover plate can avoid mud adhesion and prevent the increase in valve opening resistance from affecting the normal operation of the pressure relief valve.

[0018] 4. In one embodiment of this utility model, a first flange is provided on the side of the cover plate facing the sealing part, and a first step is provided on the side of the sealing part facing the cover plate, with a first gap between the first flange and the first step; a second step is provided inside the main body, with a second gap between the sealing element and the second step. Because of the first gap between the first flange and the first step, and the second gap between the sealing element and the second step, when the valve cover assembly moves relative to the main body, no resistance is generated between the first flange and the first step, nor between the sealing element and the second step. This prevents unnecessary resistance from interfering with the normal opening and closing of the pressure relief valve and affecting its sealing effect.

[0019] 5. In one embodiment of this utility model, the elastic element is disposed within a through hole, and the fixing element is fixedly connected to the main body. The end of the fixing element away from the elastic element is flush with the end of the main body away from the valve cover assembly. A second flange is provided on the side of the fixing element facing the main body, and a third limiting step is provided on the side of the main body facing the fixing element. The second flange abuts against the third limiting step. The elastic element is disposed within the through hole, forming a concealed design, avoiding external interference to the elastic element. This allows the elastic element to precisely pull the valve cover assembly back to its original position only when the valve cover assembly is separated from the main body, without being affected by other external factors. The fixed connection between the fixing element and the main body ensures that the position of the end of the elastic element connected to the fixing element remains unchanged, ensuring the stability of the elastic element during operation. The end of the fixing element away from the elastic element is flush with the end of the main body away from the valve cover assembly, preventing the fixing element from protruding and interfering with other components inside the energy storage device, and facilitating integrated installation. The fastener has a second flange on the side facing the main body, and a third limiting step on the side facing the fastener. The second flange and the third limiting step abut against each other to improve the structural stability of the fastener. Under vibration or impact conditions of the energy storage device, the fastener and the main body are suppressed from relative displacement, preventing threshold deviation of the elastic element caused by the positional displacement of the fastener.

[0020] 6. In one embodiment of this utility model, the valve cover assembly further includes a stainless steel sheet sandwiched between the cover plate and the sealing element. The cover plate is fixedly connected to the stainless steel sheet, and the cover plate is also fixedly connected to the sealing element. The stainless steel sheet facilitates the accurate adsorption of the corresponding position of the valve cover assembly by the airtightness testing equipment, enabling rapid airtightness testing. The stainless steel sheet sandwiched between the cover plate and the sealing element allows for accurate adsorption by the airtightness testing equipment while preventing it from being exposed, thus extending its service life. The fixed connection between the cover plate and the stainless steel sheet, and the fixed connection between the cover plate and the sealing element, allows the cover plate, stainless steel sheet, and sealing element to move synchronously, forming a movement of the valve cover assembly relative to the main body to control the opening and closing of pressure relief.

[0021] 7. In one embodiment of this utility model, one of the cover plate and the stainless steel sheet is provided with a limiting block, and the other has a limiting hole. The limiting block and the limiting hole are connected by an interference fit. The cover plate and the sealing element are connected by an interference fit, adhesive bonding, threaded connection, snap-fit ​​connection, or riveting connection. The limiting structure with the limiting block and the limiting hole by an interference fit does not require additional fasteners. The tight connection is achieved by utilizing the material elasticity of the cover plate and the stainless steel sheet itself, preventing the stainless steel sheet from shifting its position under high-frequency pressure fluctuations. The interference fit, adhesive bonding, threaded connection, snap-fit ​​connection, or riveting connection between the cover plate and the sealing element can all achieve a tight and firm connection between the cover plate and the sealing element, allowing the cover plate and the sealing element to move synchronously to open and close the pressure relief valve.

[0022] 8. In one embodiment of this utility model, the valve body further includes an inner sealing ring. An inner sealing groove is formed within the main body, and the inner sealing ring is disposed in the inner sealing groove. When the valve cover assembly is connected to the main body, the sealing element abuts against the inner sealing ring. And / or, the valve body further includes a lower sealing ring. A lower sealing groove is formed at the end of the main body away from the valve cover assembly, and the lower sealing ring is disposed in the lower sealing groove. When the valve cover assembly is connected to the main body, the pressure relief valve is in a closed state. At this time, the abutment between the sealing element and the inner sealing ring can improve the sealing performance of the pressure relief valve and prevent gas leakage from the mating gap between the valve cover assembly and the main body. The end of the main body away from the valve cover assembly is used to contact the opening of the energy storage device to achieve the assembly connection of the pressure relief valve and the energy storage device, forming a complete ventilation channel. A lower sealing groove is formed at the end of the main body away from the valve cover assembly, and the lower sealing ring is disposed in the lower sealing groove. The lower sealing ring can seal the gap between the pressure relief valve and the energy storage device, preventing gas leakage from the mating gap between the pressure relief valve and the energy storage device, further improving the sealing performance of the pressure relief valve assembly.

[0023] 9. In one embodiment of this utility model, the sealing element is further provided with a venting component, through which gas in the through hole reaches the outside of the pressure relief valve. The venting component on the sealing element allows gas exchange while maintaining the sealing performance of the pressure relief valve. Gas in the through hole reaches the outside of the pressure relief valve through the venting component, thereby preventing pressure accumulation. This allows gas to pass through under normal conditions, while the valve cover assembly separates from the main body for rapid pressure relief in case of abnormal pressure, meeting the pressure control requirements under different operating conditions. In the energy storage device, the pressure relief valve serves both as a breather valve that allows gas to pass through and prevents gas accumulation, and as a safety valve that quickly releases gas to block the accumulation of dangerous pressure when the pressure exceeds a threshold, providing a guarantee for the safe operation of the energy storage device.

[0024] 10. The sealing device in one embodiment of this utility model has the same beneficial effects as the pressure relief valve described above, and will not be repeated here. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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 these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional structural diagram of the pressure relief valve provided in the first embodiment of this utility model.

[0027] Figure 2 This is a cross-sectional structural diagram of the pressure relief valve in its sealed state according to the first embodiment of this utility model.

[0028] Figure 3 This is a cross-sectional structural diagram of the pressure relief valve in the pressure relief state provided in the first embodiment of this utility model.

[0029] Figure 4 This is an exploded structural diagram of the pressure relief valve provided in the first embodiment of this utility model.

[0030] Figure 5 yes Figure 2 Enlarged view of the structure of part A in the middle.

[0031] Figure 6 This is a three-dimensional structural diagram of the cover plate of the pressure relief valve provided in the first embodiment of this utility model.

[0032] Figure 7 This is a partial cross-sectional structural diagram of the sealing device provided in the second embodiment of the present invention.

[0033] Explanation of reference numerals in the attached diagram:

[0034] 1. Pressure relief valve; 10. Valve body; 11. Main body; 12. Elastic element; 13. Fixing element; 14. Inner sealing ring; 15. Lower sealing ring; 16. First gap; 17. Second gap; 20. Valve cover assembly; 21. Cover plate; 22. Sealing element; 23. Stainless steel sheet; 111. Through hole; 112. Sealing part; 113. Second step; 114. Third limiting step; 115. Inner sealing groove; 116. Lower sealing groove; 131. Second flange; 211. First flange; 212. Limiting block; 221. Vent assembly; 231. Limiting hole; 1121. First step;

[0035] 100. Sealing device; 101. Sealing housing; 102. Receiving cavity; 1011. Opening. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0037] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0038] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0039] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0040] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0041] Please combine Figures 1 to 4The first embodiment of this utility model provides a pressure relief valve 1, which includes a valve body 10 and a valve cover assembly 20. The valve body 10 includes a main body 11, an elastic element 12, and a fixing element 13. The main body 11 has a through hole 111. The valve cover assembly 20 and the fixing element 13 are respectively disposed on opposite sides of the through hole 111. The valve cover assembly 20 includes a cover plate 21 and a sealing element 22 arranged sequentially facing the through hole 111. The valve cover assembly 20 can contact or separate from the main body 11 to realize the closure or opening of the through hole 111. The two ends of the elastic element 12 are respectively connected to the sealing element 22 and the fixing element 13.

[0042] Understandably, the through hole 111 serves as a channel for gas discharge. When the gas pressure inside the energy storage device is too high, the valve cover assembly 20 is pushed open, the valve cover assembly 20 separates from the main body 11, and the gas is discharged through the through hole 111 from the gap between the main body 11 and the valve cover assembly 20. After the air pressure is rebalanced, since the two ends of the elastic element 12 are respectively connected to the sealing element 22 and the fixing element 13, the sealing element 22 is used to seal the through hole 111, and the fixing element 13 is used to fix one end of the elastic element 12. This allows the elastic element 12 to move with the valve cover assembly 20 only at the end connected to the sealing element 22. The deformation of the elastic element 12 occurs only in a single axial direction, avoiding force dispersion or displacement of the elastic element 12. The reset force of the elastic element 12 drives the valve cover assembly 20 to reset and re-seal. The elastic element 12 can provide a uniform and adjustable reset force, ensuring that the valve cover assembly 20 opens or closes smoothly when the pressure fluctuates. The sealing element 22 is directly subjected to the tension of the elastic element 12, and maintains a sealed fit when the pressure does not exceed the standard, preventing accidental opening. It also cooperates with the elastic element 12 to form a dynamic balance sealing structure, improving the structural stability and performance reliability of the pressure relief valve 1.

[0043] It should be noted that, Figure 2 This demonstrates the state where the pressure relief valve 1 is in a sealed state, with the valve cover assembly 20 connected to the main body 11 and the through hole 111 closed. Figure 3 This demonstrates that when the pressure relief valve 1 is in the pressure relief state, the valve cover assembly 20 is separated from the main body 11, and the through hole 111 is open to allow gas to escape.

[0044] Optionally, the main body 11 is made of metal, which has high rigidity and corrosion resistance, matching the characteristics of high pressure, high temperature and high corrosion in energy storage scenarios.

[0045] Please combine Figure 2 and Figure 3 Furthermore, the elastic element 12 is a tension spring.

[0046] Understandably, the tension spring bears axial tension. When the gas pressure inside the energy storage device is too high, the gas pressure forces the valve cover assembly 20 to separate from the main body 11, stretching the tension spring and increasing the coil spacing. After the gas is discharged, the tension spring recovers its original length by contracting, releasing elastic potential energy. Compared to compression springs, which require precise guiding structures such as guide rods to prevent bending or lateral displacement of the elastic element 12, thus increasing the structural complexity and cost of the pressure relief valve 1, the tension spring can be directly connected to the seal 22 and the fixing element 13, reducing structural complexity. The tension of the tension spring is linearly related to its elongation, facilitating accurate calculation of the pressure relief threshold, while the compression spring exhibits nonlinear force characteristics under compression, which can easily affect the pressure relief accuracy. The stable tension of the tension spring allows the seal 22 to quickly and accurately reset after pressure relief, avoiding the problem of incomplete reset that may occur with compression springs, further improving the performance reliability of the pressure relief valve 1.

[0047] Optionally, as a specific implementation, the tension spring adopts a large-size spring with a relatively thicker wire diameter and a relatively smaller number of coils. The large-size spring has a wider range of elastic deformation, a more uniform stress distribution, and is less prone to local yielding, thereby maintaining the linear relationship of Hooke's Law, improving the stability of the elastic element 12, and increasing the stability of the opening pressure of the pressure relief valve 1.

[0048] Please continue to combine Figure 2 and Figure 3 Furthermore, the main body 11 includes a sealing portion 112 disposed on the side near the cover plate 21. In the radial direction perpendicular to the axial direction of the through hole 111, the radial dimension of the cover plate 21 is greater than or equal to the radial dimension of the sealing portion 112.

[0049] Understandably, since the radial dimension of the cover plate 21 is greater than or equal to the radial dimension of the sealing part 112, the cover plate 21 covers the sealing part 112. In view of the fact that the existing design is prone to mud adhesion or dust accumulation under complex and harsh working conditions, which will affect the pressure relief opening and sealing functions, the covering design of the cover plate 21 can avoid mud adhesion and prevent the valve opening resistance from rising and affecting the normal operation of the pressure relief valve 1.

[0050] Please combine Figure 2 and Figure 5 Furthermore, the cover plate 21 has a first flange 211 on the side facing the sealing part 112, and the sealing part 112 has a first step 1121 on the side facing the cover plate 21, with a first gap 16 between the first flange 211 and the first step 1121; the main body 11 has a second step 113 inside, with a second gap 17 between the sealing member 22 and the second step 113.

[0051] Understandably, since there is a first gap 16 between the first flange 211 and the first step 1121, and a second gap 17 between the seal 22 and the second step 113, when the valve cover assembly 20 moves relative to the main body 11, there will be no resistance between the first flange 211 and the first step 1121, nor will there be resistance between the seal 22 and the second step 113, so as to avoid unnecessary resistance interfering with the normal opening and closing of the pressure relief valve 1 and affecting the sealing effect of the pressure relief valve 1.

[0052] Please continue to combine Figures 2 to 5 Furthermore, the elastic member 12 is disposed in the through hole 111, and the fixing member 13 is fixedly connected to the main body 11. The end of the fixing member 13 away from the elastic member 12 is flush with the end of the main body 11 away from the valve cover assembly 20. A second flange 131 is provided on the side of the fixing member 13 facing the main body 11, and a third limiting step 114 is provided on the side of the main body 11 facing the fixing member 13. The second flange 131 abuts against the third limiting step 114.

[0053] Understandably, the elastic element 12 is housed within the through hole 111, forming a concealed design to avoid external interference to the elastic element 12. This allows the elastic element 12 to precisely pull the valve cover assembly 20 back to its original position only when the valve cover assembly 20 is separated from the main body 11, without being affected by other external factors. The fixing element 13 is fixedly connected to the main body 11, ensuring that the position of the end of the elastic element 12 connected to the fixing element 13 remains unchanged, thus ensuring the stability of the elastic element 12 during operation. The end of the fixing element 13 away from the elastic element 12 is flush with the end of the main body 11 away from the valve cover assembly 20, preventing the fixing element 13 from protruding and interfering with other components inside the energy storage device, and facilitating integrated installation. The side of the fastener 13 facing the main body 11 is provided with a second flange 131, and the side of the main body 11 facing the fastener 13 is provided with a third limiting step 114. The second flange 131 and the third limiting step 114 abut against each other, thereby improving the structural stability of the fastener 13. Under the vibration or impact conditions of the energy storage device, the fastener 13 and the main body 11 are suppressed from relative displacement, and the threshold deviation of the elastic element 12 caused by the positional displacement of the fastener 13 is prevented.

[0054] Optionally, the fastener 13 can be fixedly connected to the main body 11 by welding, interference fit, adhesive connection, threaded connection, snap-fit ​​connection or riveting connection.

[0055] Please combine Figure 2 and Figure 4 Furthermore, the valve cover assembly 20 also includes a stainless steel sheet 23 sandwiched between the cover plate 21 and the seal 22, with the cover plate 21 and the stainless steel sheet 23 fixedly connected, and the cover plate 21 and the seal 22 fixedly connected.

[0056] Understandably, the stainless steel sheet 23 is designed to facilitate precise adsorption of the corresponding position of the valve cover assembly 20 by the airtightness testing equipment, enabling rapid airtightness testing. The stainless steel sheet 23 is sandwiched between the cover plate 21 and the seal 22, allowing for precise adsorption by the airtightness testing equipment while preventing it from being exposed, thus extending its service life. The cover plate 21 is fixedly connected to the stainless steel sheet 23, and the cover plate 21 is also fixedly connected to the seal 22, allowing the cover plate 21, stainless steel sheet 23, and seal 22 to move synchronously, resulting in the overall movement of the valve cover assembly 20 relative to the main body 11 to control the opening and closing of pressure relief.

[0057] Please combine Figure 4 and Figure 6 Furthermore, one of the cover plate 21 and the stainless steel sheet 23 is provided with a limiting block 212, and the other is provided with a limiting hole 231. The limiting block 212 and the limiting hole 231 are connected by interference fit. The cover plate 21 and the sealing element 22 are connected by interference fit, adhesive, thread, snap-fit ​​or riveting.

[0058] Understandably, the limiting structure with the interference fit between the limiting block 212 and the limiting hole 231 requires no additional fasteners. The tight connection is achieved using the material elasticity of the cover plate 21 and the stainless steel sheet 23, preventing the stainless steel sheet 23 from shifting position under high-frequency pressure fluctuations. The cover plate 21 and the seal 22 can be connected by interference fit, adhesive, thread, snap-fit, or riveting. All of these connection methods can achieve a tight and secure connection between the cover plate 21 and the seal 22, allowing the cover plate 21 and the seal 22 to move synchronously to open and close the pressure relief valve 1.

[0059] Please combine Figures 2 to 5 Furthermore, the valve body 10 also includes an inner sealing ring 14. An inner sealing groove 115 is provided in the main body 11, and the inner sealing ring 14 is disposed in the inner sealing groove 115. When the valve cover assembly 20 is connected to the main body 11, the sealing element 22 abuts against the inner sealing ring 14.

[0060] Understandably, when the valve cover assembly 20 is connected to the body 11, the pressure relief valve 1 is in the closed state. At this time, the seal 22 abuts against the inner sealing ring 14, which can improve the sealing performance of the pressure relief valve 1 and prevent gas from leaking from the mating gap between the valve cover assembly 20 and the body 11. The end of the body 11 away from the valve cover assembly 20 is used to contact the opening of the energy storage device to realize the assembly connection between the pressure relief valve 1 and the energy storage device, forming a complete venting channel.

[0061] Please combine Figure 2 and Figure 5 Furthermore, the valve body 10 also includes a lower sealing ring 15. A lower sealing groove 116 is provided at the end of the main body 11 away from the valve cover assembly 20, and the lower sealing ring 15 is disposed at the lower sealing groove 116.

[0062] Understandably, a lower sealing groove 116 is provided at the end of the main body 11 away from the valve cover assembly 20, and a lower sealing ring 15 is provided at the lower sealing groove 116. The lower sealing ring 15 can seal the gap between the pressure relief valve 1 and the energy storage device, prevent gas from leaking from the mating gap between the pressure relief valve 1 and the energy storage device, and further improve the sealing performance of the pressure relief valve 1 assembly.

[0063] Please see Figure 4 Furthermore, the seal 22 is also provided with a venting component 221, through which the gas in the through hole 111 reaches the outside of the pressure relief valve 1.

[0064] Understandably, the venting component 221 on the seal 22 allows gas exchange while maintaining the sealing performance of the pressure relief valve 1. Gas in the through hole 111 reaches the outside of the pressure relief valve 1 through the venting component 221, thereby preventing pressure accumulation. This allows gas to pass through under normal conditions, while the valve cover assembly 20 separates from the main body 11 for rapid pressure relief in case of abnormal pressure, meeting the pressure control requirements under different operating conditions. In the energy storage device, the pressure relief valve 1 serves both as a breather valve that allows gas to pass through and prevents gas accumulation, and as a safety valve that quickly releases gas to block the accumulation of dangerous pressure when the pressure exceeds a threshold, providing a guarantee for the safe operation of the energy storage device.

[0065] Optionally, the breathable components can be made of ePTFE (expanded PTFE) breathable membranes, porous ceramic seals, temperature-sensitive / pressure-sensitive gels, one-way valves, etc., to achieve the effect of normal pressure breathability.

[0066] Please see Figure 7 The second embodiment of this utility model provides a sealing device 100, which includes a sealing housing 101 and a pressure relief valve 1 of the first embodiment of this utility model. The sealing device 100 has an internal cavity 102, and the sealing housing 101 has an opening 1011 that connects the cavity 102 to the outside. The pressure relief valve 1 is located at the opening 1011 and closes the opening 1011.

[0067] It should be noted that the sealing device 100 can be a new energy battery pack, energy storage device, etc.

[0068] Understandably, the sealing device 100 has the same beneficial effects as the pressure relief valve 1 of the first embodiment of this utility model, and will not be described again here.

[0069] Compared with the prior art, the pressure relief valve and sealing device of this utility model have the following advantages:

[0070] 1. In one embodiment of this utility model, the pressure relief valve includes a valve body and a valve cover assembly. The valve body includes a main body, an elastic element, and a fixing element. The main body has a through hole. The valve cover assembly and the fixing element are respectively disposed on opposite sides of the through hole. The valve cover assembly includes a cover plate and a sealing element arranged sequentially facing the through hole. The valve cover assembly can contact or separate from the main body to close or open the through hole. The two ends of the elastic element are respectively connected to the sealing element and the fixing element. The through hole serves as a channel for gas discharge. When the gas pressure inside the energy storage device is too high, the valve cover assembly is pushed open, separating from the main body, and the gas is discharged through the through hole from the gap between the main body and the valve cover assembly. After the air pressure is rebalanced, the elastic element is connected to a sealing element and a fixing element at both ends. The sealing element seals the through hole, and the fixing element fixes one end of the elastic element. This ensures that only the end of the elastic element connected to the sealing element moves with the valve cover assembly. The deformation of the elastic element occurs only in a single axial direction, preventing force dispersion or displacement. The reset force of the elastic element drives the valve cover assembly to reset and re-seal. The elastic element can provide a uniform and adjustable reset force, ensuring that the valve cover assembly opens or closes smoothly during pressure fluctuations. The sealing element is directly subjected to the tension of the elastic element, maintaining a sealed fit when the pressure is not exceeded, preventing accidental opening. It also works with the elastic element to form a dynamic balance sealing structure, improving the structural stability and performance reliability of the pressure relief valve.

[0071] 2. In one embodiment of this utility model, the elastic element is a tension spring. The tension spring bears axial tension. When the gas pressure inside the energy storage device is too high, the gas pressure forces the valve cover assembly to separate from the main body, the tension spring stretches, and the coil spacing of the tension spring increases; after the gas is discharged, the tension spring recovers its original length by contraction, releasing elastic potential energy. Compared with compression springs, which require precise guiding structures such as guide rods to prevent bending or lateral displacement of the elastic element, increasing the structural complexity and cost of the pressure relief valve, tension springs can be directly connected to the sealing and fixing parts, reducing structural complexity. The tension of the tension spring is linearly related to the elongation, which facilitates accurate calculation of the pressure relief threshold, while compression springs have nonlinear force characteristics in the compressed state, which can easily affect the pressure relief accuracy. The stable tension of the tension spring allows the sealing element to quickly and accurately reset after pressure relief, avoiding the problem of incomplete reset that may occur with compression springs, further improving the performance reliability of the pressure relief valve.

[0072] 3. In one embodiment of this utility model, the main body includes a sealing part disposed near the cover plate. In the radial direction perpendicular to the axial direction of the through hole, the radial dimension of the cover plate is greater than or equal to the radial dimension of the sealing part. Because the radial dimension of the cover plate is greater than or equal to the radial dimension of the sealing part, the cover plate covers the sealing part. Existing designs are prone to mud adhesion or dust accumulation under complex and harsh working conditions, affecting the pressure relief opening and sealing functions. The covering design of the cover plate can avoid mud adhesion and prevent the increase in valve opening resistance from affecting the normal operation of the pressure relief valve.

[0073] 4. In one embodiment of this utility model, a first flange is provided on the side of the cover plate facing the sealing part, and a first step is provided on the side of the sealing part facing the cover plate, with a first gap between the first flange and the first step; a second step is provided inside the main body, with a second gap between the sealing element and the second step. Because of the first gap between the first flange and the first step, and the second gap between the sealing element and the second step, when the valve cover assembly moves relative to the main body, no resistance is generated between the first flange and the first step, nor between the sealing element and the second step. This prevents unnecessary resistance from interfering with the normal opening and closing of the pressure relief valve and affecting its sealing effect.

[0074] 5. In one embodiment of this utility model, the elastic element is disposed within a through hole, and the fixing element is fixedly connected to the main body. The end of the fixing element away from the elastic element is flush with the end of the main body away from the valve cover assembly. A second flange is provided on the side of the fixing element facing the main body, and a third limiting step is provided on the side of the main body facing the fixing element. The second flange abuts against the third limiting step. The elastic element is disposed within the through hole, forming a concealed design, avoiding external interference to the elastic element. This allows the elastic element to precisely pull the valve cover assembly back to its original position only when the valve cover assembly is separated from the main body, without being affected by other external factors. The fixed connection between the fixing element and the main body ensures that the position of the end of the elastic element connected to the fixing element remains unchanged, ensuring the stability of the elastic element during operation. The end of the fixing element away from the elastic element is flush with the end of the main body away from the valve cover assembly, preventing the fixing element from protruding and interfering with other components inside the energy storage device, and facilitating integrated installation. The fastener has a second flange on the side facing the main body, and a third limiting step on the side facing the fastener. The second flange and the third limiting step abut against each other to improve the structural stability of the fastener. Under vibration or impact conditions of the energy storage device, the fastener and the main body are suppressed from relative displacement, preventing threshold deviation of the elastic element caused by the positional displacement of the fastener.

[0075] 6. In one embodiment of this utility model, the valve cover assembly further includes a stainless steel sheet sandwiched between the cover plate and the sealing element. The cover plate is fixedly connected to the stainless steel sheet, and the cover plate is also fixedly connected to the sealing element. The stainless steel sheet facilitates the accurate adsorption of the corresponding position of the valve cover assembly by the airtightness testing equipment, enabling rapid airtightness testing. The stainless steel sheet sandwiched between the cover plate and the sealing element allows for accurate adsorption by the airtightness testing equipment while preventing it from being exposed, thus extending its service life. The fixed connection between the cover plate and the stainless steel sheet, and the fixed connection between the cover plate and the sealing element, allows the cover plate, stainless steel sheet, and sealing element to move synchronously, forming a movement of the valve cover assembly relative to the main body to control the opening and closing of pressure relief.

[0076] 7. In one embodiment of this utility model, one of the cover plate and the stainless steel sheet is provided with a limiting block, and the other has a limiting hole. The limiting block and the limiting hole are connected by an interference fit. The cover plate and the sealing element are connected by an interference fit, adhesive bonding, threaded connection, snap-fit ​​connection, or riveting connection. The limiting structure with the limiting block and the limiting hole by an interference fit does not require additional fasteners. The tight connection is achieved by utilizing the material elasticity of the cover plate and the stainless steel sheet itself, preventing the stainless steel sheet from shifting its position under high-frequency pressure fluctuations. The interference fit, adhesive bonding, threaded connection, snap-fit ​​connection, or riveting connection between the cover plate and the sealing element can all achieve a tight and firm connection between the cover plate and the sealing element, allowing the cover plate and the sealing element to move synchronously to open and close the pressure relief valve.

[0077] 8. In one embodiment of this utility model, the valve body further includes an inner sealing ring. An inner sealing groove is formed within the main body, and the inner sealing ring is disposed in the inner sealing groove. When the valve cover assembly is connected to the main body, the sealing element abuts against the inner sealing ring. And / or, the valve body further includes a lower sealing ring. A lower sealing groove is formed at the end of the main body away from the valve cover assembly, and the lower sealing ring is disposed in the lower sealing groove. When the valve cover assembly is connected to the main body, the pressure relief valve is in a closed state. At this time, the abutment between the sealing element and the inner sealing ring can improve the sealing performance of the pressure relief valve and prevent gas leakage from the mating gap between the valve cover assembly and the main body. The end of the main body away from the valve cover assembly is used to contact the opening of the energy storage device to achieve the assembly connection of the pressure relief valve and the energy storage device, forming a complete ventilation channel. A lower sealing groove is formed at the end of the main body away from the valve cover assembly, and the lower sealing ring is disposed in the lower sealing groove. The lower sealing ring can seal the gap between the pressure relief valve and the energy storage device, preventing gas leakage from the mating gap between the pressure relief valve and the energy storage device, further improving the sealing performance of the pressure relief valve assembly.

[0078] 9. In one embodiment of this utility model, the sealing element is further provided with a venting component, through which gas in the through hole reaches the outside of the pressure relief valve. The venting component on the sealing element allows gas exchange while maintaining the sealing performance of the pressure relief valve. Gas in the through hole reaches the outside of the pressure relief valve through the venting component, thereby preventing pressure accumulation. This allows gas to pass through under normal conditions, while the valve cover assembly separates from the main body for rapid pressure relief in case of abnormal pressure, meeting the pressure control requirements under different operating conditions. In the energy storage device, the pressure relief valve serves both as a breather valve that allows gas to pass through and prevents gas accumulation, and as a safety valve that quickly releases gas to block the accumulation of dangerous pressure when the pressure exceeds a threshold, providing a guarantee for the safe operation of the energy storage device.

[0079] 10. The sealing device in one embodiment of this utility model has the same beneficial effects as the pressure relief valve described above, and will not be repeated here.

[0080] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure relief valve, characterized in that: The pressure relief valve includes a valve body and a valve cover assembly. The valve body includes a main body, an elastic element, and a fixing element. The main body has a through hole. The valve cover assembly and the fixing element are respectively disposed on opposite sides of the through hole. The valve cover assembly includes a cover plate and a sealing element arranged sequentially facing the through hole. The valve cover assembly can contact or separate from the main body to close or open the through hole. The two ends of the elastic element are respectively connected to the sealing element and the fixing element.

2. The pressure relief valve as described in claim 1, characterized in that: The elastic element is a tension spring.

3. The pressure relief valve as described in claim 1, characterized in that: The main body includes a sealing portion disposed near the side of the cover plate, and in a radial direction perpendicular to the axial direction of the through hole, the radial dimension of the cover plate is greater than or equal to the radial dimension of the sealing portion.

4. The pressure relief valve as described in claim 3, characterized in that: The cover plate has a first flange on the side facing the sealing part, and the sealing part has a first step on the side facing the cover plate, with a first gap between the first flange and the first step; the main body has a second step, with a second gap between the sealing element and the second step.

5. The pressure relief valve as described in claim 1, characterized in that: The elastic element is disposed in the through hole, and the fixing element is fixedly connected to the main body. The end of the fixing element away from the elastic element is flush with the end of the main body away from the valve cover assembly. The side of the fixing element facing the main body is provided with a second flange, and the side of the main body facing the fixing element is provided with a third limiting step. The second flange abuts against the third limiting step.

6. The pressure relief valve as described in claim 1, characterized in that: The valve cover assembly further includes a stainless steel sheet sandwiched between the cover plate and the seal, wherein the cover plate is fixedly connected to the stainless steel sheet and the seal is fixedly connected to the seal.

7. The pressure relief valve as described in claim 6, characterized in that: One of the cover plate and the stainless steel sheet is provided with a limiting block, and the other is provided with a limiting hole. The limiting block and the limiting hole are connected by interference fit. The cover plate and the sealing element are connected by interference fit, adhesive, thread, snap-fit ​​or riveting.

8. The pressure relief valve as described in claim 1, characterized in that: The valve body also includes an inner sealing ring. An inner sealing groove is provided in the main body. The inner sealing ring is disposed in the inner sealing groove. When the valve cover assembly contacts the main body, the sealing element abuts against the inner sealing ring. And / or, the valve body further includes a lower sealing ring, and a lower sealing groove is provided at one end of the main body away from the valve cover assembly, and the lower sealing ring is disposed in the lower sealing groove.

9. The pressure relief valve as described in claim 1, characterized in that: The sealing element is also provided with a venting component, through which the gas in the through hole reaches the outside of the pressure relief valve.

10. A sealing device, characterized in that: The sealing device includes a sealing housing and a pressure relief valve as described in any one of claims 1 to 9. The sealing device has an internal cavity, and the sealing housing has an opening that connects the cavity to the outside. The pressure relief valve is located at the opening and closes the opening.

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