Explosion-proof valve and sealing equipment

Abstract

The utility model relates to the technical field of new energy battery packs and energy storage equipment, in particular to an explosion-proof valve and sealing equipment, which comprises a top cover, a fireproof net and a shell, the shell is provided with a through hole, the top cover comprises a connecting plate and a pressure relief plate which are connected, a weak connecting position is arranged between the connecting plate and the pressure relief plate, and the connecting plate is fixedly connected with the shell. The connecting plate is fixedly connected with the shell, the position of the pressure relief plate corresponds to the through hole, the fireproof net is arranged at the end, close to the top cover, of the through hole, one face of the fireproof net abuts against the top cover, and the other face of the fireproof net is connected with the shell at the position of the through hole. The anti-explosion valve can solve the technical problems that an anti-explosion valve is complex in structure and low in structural stability and performance reliability.

Description

[Technical field]

[0001] The utility model relates to the technical field of new energy battery packs and energy storage equipment, and in particular to an explosion-proof valve and sealing equipment. [Background technology]

[0002] An explosion-proof valve is a safety device used to prevent explosion or rupture of a pressure vessel or system due to pressure exceeding the allowable range. The working principle of the explosion-proof valve is that when the system pressure reaches the set value, the explosion-proof valve will automatically open to release the excessive pressure to maintain the safe operation of the system. When the explosion-proof valve is used in new energy battery packs and energy storage equipment, when the battery cells inside the sealed box of the battery pack and energy storage equipment thermally run away and generate high-pressure gas, the air pressure inside the box reaches the explosion value set by the pressure relief valve, achieving rapid explosion and pressure relief to avoid accidents.

[0003] However, existing explosion-proof valves have complex structures, are over-designed, have low structural stability and performance reliability, ignore basic product performance guarantees, and are unable to adapt to more demanding market demands. [Contents of the utility model]

[0004] In order to solve the technical problems of complex explosion-proof valve structure, low structural stability and low performance reliability, the utility model provides an explosion-proof valve and a sealing device.

[0005] The solution to the technical problem of the utility model is to provide an explosion-proof valve, including a top cover, a fireproof net and a shell, a through hole is provided on the shell, the top cover includes a connected connecting plate and a pressure relief plate, a weak connection position is provided between the connecting plate and the pressure relief plate, the connecting plate is fixedly connected to the shell, the position of the pressure relief plate corresponds to the through hole, the fireproof net is arranged at one end of the through hole close to the top cover, one side of the fireproof net is against the top cover, and the other side is connected to the shell at the through hole.

[0006] Preferably, the pressure relief plate comprises at least one connected pressure relief sub-plate, and weak connection positions are provided between adjacent pressure relief sub-plates.

[0007] Preferably, the weak connection point is a thinning notch.

[0008] Preferably, a plurality of mesh holes are provided on the fireproof net, and the area of ​​the fireproof net provided with the mesh holes corresponds to the pressure relief plate.

[0009] Preferably, the connecting plate and the pressure relief plate are located on different planes, and the connecting plate is located on a side of the outer periphery of the pressure relief plate close to the fireproof net; a groove is provided at the pressure relief plate on a side of the top cover close to the fireproof net.

[0010] Preferably, a first step structure is provided on the fireproof net, and the first step structure is located in the groove and abuts against the pressure relief plate.

[0011] Preferably, a mounting frame is provided in the through hole, and a side of the fireproof net away from the top cover is connected to the mounting frame.

[0012] Preferably, the edge of the through hole cooperates with the mounting frame to form a second step structure, and the edge of the fireproof net is supported on the second step structure.

[0013] Preferably, it also includes a first sealing ring and a second sealing ring. On a side of the shell close to the fireproof net, a first installation groove is opened around the periphery of the through hole, and the first sealing ring is located in the first installation groove; on a side of the shell away from the fireproof net, a second installation groove is opened around the periphery of the through hole, and the second sealing ring is located in the second installation groove.

[0014] Preferably, the utility model also provides a sealing device, including an explosion-proof valve.

[0015] Compared with the prior art, the explosion-proof valve and sealing device provided by the utility model have the following advantages:

[0016] 1. The utility model provides an explosion-proof valve, which can automatically destroy the top cover to release pressure when the internal pressure of the sealing device is too high through the top cover tightly attached to the fireproof net, and the fireproof net is installed in the shell, so as to avoid safety accidents caused by excessive internal pressure; specifically, the through hole opened on the shell defines the basic pressure relief channel; the top cover is closed on the shell and the through hole is closed, so as to ensure that the sealing device is isolated from the outside under normal conditions, and avoid safety accidents caused by the entry of foreign objects into the interior; a connecting plate and a pressure relief plate are arranged on the top cover, and a weak connection position is arranged between the two. The existence of the weak connection position makes it easy to break the connection between the connecting plate and the pressure relief plate, so as to achieve The sealed device responds quickly when the internal pressure is too high, and the position of the pressure relief plate corresponds to the through hole, which ensures the accuracy of the pressure relief path; the fireproof net design can effectively block flames and foreign matter during pressure relief; one side of the fireproof net is against the top cover, and the other side is connected to the shell at the through hole, which can provide support for the top cover on the inside to prevent the connecting plate and the pressure relief plate of the top cover from accidentally separating due to the force from the outside; in summary, the explosion-proof valve provided by the utility model can not only prevent the entry of external foreign matter, but also ensure that when the pressure is abnormal, the gas can be released smoothly through the through hole, effectively preventing safety accidents caused by excessive internal pressure of sealed equipment such as battery packs or energy storage devices.

[0017] The utility model provides a simple structural design, low manufacturing cost, better structural stability and performance reliability. When the explosion-proof valve pressure is too high, the weak connection position is opened to achieve pressure relief and explosion prevention. In addition, the fireproof mesh screen is tightly attached to the top cover to prevent external impact and protect the risk of non-preset opening from the outside.

[0018] 2. The utility model provides an explosion-proof valve, which realizes pressure relief of the explosion-proof valve by using gas to break open the weak connection points between the pressure relief sub-plates; specifically, when the internal pressure of the explosion-proof valve reaches a set critical value, the weak connection points between the pressure relief sub-plates are squeezed and ruptured, and the opening is rapidly expanded to form a high-speed pressure relief channel.

[0019] 3. The utility model provides an explosion-proof valve, in which the weak connection position is set as a thinning score, so that the weak connection position can be easily broken open; specifically, the weak connection position is set as a thinning score, and the thinning score is an area with a thinner thickness on the top cover. When the pressure in the sealing device is too high, it is easy to break through the top cover through the thinning score, and it is easy to produce through one-piece molding or reprocessing, thereby saving costs.

[0020] 4. The utility model provides an explosion-proof valve, which allows the gas in the sealed device to break through the top cover through the mesh holes by arranging mesh holes on the fireproof net; specifically, a plurality of mesh holes are provided on the fireproof net, and the area of ​​the fireproof net where the mesh holes are provided corresponds to the pressure relief plate. When the pressure in the sealed device is too high, the gas passes through the fireproof net and accurately breaks through the weak connection position of the pressure relief plate area corresponding to the mesh holes, and the mesh structure prevents the splashing of fireworks and ejected materials inside the battery pack, thereby avoiding the risk of secondary combustion.

[0021] 5. The utility model provides an explosion-proof valve, which realizes pressure relief of the sealing device by arranging the connecting plate and the pressure relief plate on different planes so that the weak connection between the two can be more easily opened; specifically, the connecting plate and the pressure relief plate are located on different planes, and the connecting plate is located on the side of the outer periphery of the pressure relief plate close to the fireproof net; a groove is provided on the pressure relief plate on the side of the top cover close to the fireproof net, so that the weak connection between the connecting plate and the pressure relief plate can be easily opened, and the pressure relief plate is opened by gas to realize pressure relief and explosion prevention.

[0022] 6. The utility model provides an explosion-proof valve, which enables the fireproof net to fit tightly with the top cover by providing a structure on the fireproof net that cooperates with the groove at the pressure relief plate, and the fireproof net can better protect the top cover; specifically, a first step structure is provided on the fireproof net, and the first step structure is located in the groove and abuts against the pressure relief plate, so that the fireproof net can fit tightly with the top cover, so as to better protect the top cover from external impact and prevent the risk of the top cover being opened unexpectedly.

[0023] 7. The utility model provides an explosion-proof valve, which improves the stability of the fire net installation by arranging a mounting frame on the shell; specifically, the mounting frame is opened in the through hole, and the side of the fire net away from the top cover is connected to the mounting frame, so that the fire net can be stably installed between the shell and the top cover.

[0024] 8. The utility model provides an explosion-proof valve, which stably installs the fireproof net and the shell to prevent the displacement of the fireproof net from affecting the accuracy of the gas in rushing open the weak connection position; specifically, a second step structure is arranged at the edge of the through hole in cooperation with the mounting frame, and the edge of the fireproof net is supported on the second step structure, so that the fireproof net can be installed more firmly in the through hole.

[0025] 9. The utility model provides an explosion-proof valve, which realizes the sealed installation of the explosion-proof valve by means of a first sealing ring and a second sealing ring to prevent the non-preset circulation of gas in the explosion-proof valve; specifically, on a side of the shell close to the fireproof net, a first installation groove is opened around the outer periphery of the through hole, and the first sealing ring is located in the first installation groove; the first sealing ring plays a role in sealing the top cover on the shell to prevent gas leakage from the top cover; on a side of the shell away from the fireproof net, a second installation groove is opened around the outer periphery of the through hole, and the second sealing ring is located in the second installation groove; when the explosion-proof valve is installed on the sealing device, the second sealing ring plays a role in sealing the shell to prevent gas from circulating at the edge of the shell and affecting the operation of the battery pack in the sealing device; in summary, the explosion-proof valve provided by the utility model is internally sealed and sealedly connected to the sealing device, thereby improving the safety and reliability of the operation of the explosion-proof valve.

[0026] 10. The sealing device provided by the utility model has the same beneficial effects as the above-mentioned explosion-proof valve, which will not be described in detail here.

Brief Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the structure of an explosion-proof valve provided in the first embodiment of the utility model.

[0028] Figure 2 It is a schematic diagram of an explosion-proof valve provided in the first embodiment of the utility model.

[0029] Figure 3 It is a schematic diagram of the top cover structure provided by the first embodiment of the utility model.

[0030] Figure 4 It is a schematic diagram of the shell structure provided by the first embodiment of the utility model.

[0031] Figure 5 It is a cross-sectional schematic diagram of an explosion-proof valve provided by the first embodiment of the utility model.

[0032] Figure 6It is a schematic diagram of the top cover structure provided by the second embodiment of the utility model.

[0033] Figure 7 It is a schematic diagram of the structure of the fireproof net provided in the second embodiment of the utility model.

[0034] Figure 8 It is a cross-sectional schematic diagram of an explosion-proof valve provided in the second embodiment of the utility model.

[0035] Fig. 9 It is a structural schematic diagram of a sealing device provided in the third embodiment of the utility model.

[0036] Description of the accompanying drawings:

[0037] 1. Top cover; 2. Fireproof net; 3. Shell; 4. First sealing ring; 5. Second sealing ring;

[0038] 11. Connecting plate; 12. Pressure relief plate; 13. Weak connection position; 21. Mesh; 22. First step structure; 23. Matching groove; 31. Through hole; 32. Mounting frame; 33. Second step structure; 34. First mounting groove; 35. Second mounting groove; 36. Mounting hole; 37. Limiting block; 51. Protrusion;

[0039] 121. pressure relief sub-plate; 122. groove; 131. thinning notch. [Specific implementation method]

[0040] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0041] It should be noted that the terms "first" and "second" etc. in the specification and claims of the present utility model are used to distinguish different objects rather than to describe a specific order.

[0042] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0043] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0044] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0045] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0046] See also Figure 1 , Figure 2 and Figure 5 The first embodiment of the utility model provides an explosion-proof valve for realizing pressure relief and explosion prevention of sealed boxes such as battery packs and energy storage devices. The explosion-proof valve includes a top cover 1, a fireproof net 2 and a shell 3. A through hole 31 is provided on the shell 3. The top cover 1 includes a connecting plate 11 and a pressure relief plate 12 connected to each other. A weak connection position 13 is provided between the connecting plate 11 and the pressure relief plate 12. The connecting plate 11 is fixedly connected to the shell 3. The position of the pressure relief plate 12 corresponds to the through hole 31. The fireproof net 2 is provided at one end of the through hole 31 close to the top cover 1. One side of the fireproof net 2 is against the top cover 1, and the other side is connected to the shell 3 at the through hole 31. The utility model provides an explosion-proof valve installed on a sealed box of a battery pack and an energy storage device. When the pressure in the box is too large, the gas rushes outward from the inside of the box to open the weak connection position 13. The explosion-proof valve realizes the balance of air pressure inside and outside the box, and realizes pressure relief and explosion prevention. The structure design is simple, the manufacturing cost is low, and it has better structural stability and performance reliability. In addition, the fireproof net 2 prevents the splashing of fireworks and sprays inside the battery pack, and fits tightly against the top cover 1 to prevent external impacts and protect the top cover 1 from the risk of being opened from the outside without prior design.

[0047] Furthermore, the explosion-proof valve is roughly in the shape of a round pancake, sealed and installed on the surface of the new energy battery pack and connected to the inside of the battery pack. The top cover 1 is provided with a weak connection position 13 on one side facing the inside of the battery pack. When the pressure in the battery pack is too high, the weak connection position 13 is squeezed and ruptured, and the opening is rapidly expanded to form a high-speed pressure relief channel.

[0048] Furthermore, when the air pressure inside the battery pack reaches a critical value, the explosion-proof valve is opened through the weak connection position 13 to achieve air pressure balance inside and outside the box, and the critical value changes according to the structural settings of the top cover 1 and the weak connection position 13.

[0049] In this embodiment, when the gas pressure in the battery pack is greater than 6 Kpa, the weak connection point 13 is broken to achieve pressure relief and explosion prevention.

[0050] Furthermore, the top cover 1 is fixedly connected to the shell 3 by interference fitting / hot melt welding / ultrasonic welding, so as to avoid an unstable connection between the top cover 1 and the shell 3 and affect the operation of the explosion-proof valve.

[0051] Furthermore, the connecting plate 11 is arranged around the outer periphery of the pressure relief plate 12 .

[0052] Furthermore, the top cover 1 is configured as a plastic part, so as to facilitate punching open the weak connection position 13 on the top cover 1 .

[0053] It should be noted that the fireproof net 2 fits tightly with the top cover 1, providing support for the top cover 1 to prevent external impact and prevent the weak connection position 13 from being destroyed by external air pressure and causing unpredictable opening; at the same time, the fireproof net 2 effectively prevents the splashing of fireworks and sprays inside the battery pack, effectively prevents the backflow of external air after the pressure relief is completed, and avoids the risk of secondary combustion.

[0054] Furthermore, a plurality of mesh holes 21 are provided on the fireproof net 2, and the area of ​​the fireproof net 2 provided with the mesh holes 21 corresponds to the pressure relief plate 12. When the gas pressure reaches a critical value, the gas passes through the mesh holes 21 and reaches the pressure relief plate 12.

[0055] Furthermore, the material of the fireproof net 2 is set to metal or plastic.

[0056] See also Figure 2 , Figure 3 and Figure 5 The pressure relief plate 12 includes at least one connected pressure relief sub-plate 121 , and a weak connection position 13 is provided between adjacent pressure relief sub-plates 121 , so that the gas can break through the weak connection position 13 after passing through the mesh 21 .

[0057] Furthermore, the weak connection position 13 is configured as a thinning notch 131 , and the thinning notch 131 is a thinner area on the top cover 1 , which is easy to punch open.

[0058] In this embodiment, the weak connection points 13 at the connection between the connection plate 11 and the pressure relief plate 12 and at the connection between the pressure relief sub-plates 121 are both configured as thinning notches 131 .

[0059] It should be noted that the thinning marks 131 intersect at the center of the top cover 1 and correspond to the mesh holes 21 at the center. When the blasting pressure relief is realized, the center of the top cover 1 is firstly opened.

[0060] For details, please refer to Figure 2 and Figure 5 The housing 3 is a plastic part, which is easy to install and operate.

[0061] Furthermore, a mounting frame 32 is provided in the through hole 31 , and a side of the fireproof net 2 away from the top cover 1 is connected to the mounting frame 32 , so that the fireproof net 2 can be stably installed in the shell 3 and can abut against the top cover 1 .

[0062] Furthermore, the edge of the through hole 31 cooperates with the mounting frame 32 to form a second step structure 33, and the edge of the fireproof net 2 is supported on the second step structure 33, so that the installation of the fireproof net 2 is more stable and the fireproof net 2 is prevented from shifting when the air pressure opens the explosion-proof valve.

[0063] Furthermore, a limit block 37 is set at the edge of the second step structure 33, and a matching groove 23 is opened at the edge of the fire net 2. When the fire net 2 is installed in the shell 3, the limit block 37 and the matching groove 23 are installed correspondingly, making the installation of the fire net 2 more stable.

[0064] Specifically, the explosion-proof valve further includes a first sealing ring 4. On the side of the housing 3 close to the fireproof net 2, a first mounting groove 34 is provided around the outer circumference of the through hole 31, and the first sealing ring 4 is located in the first mounting groove 34. The portion of the first sealing ring 4 exposed to the first mounting groove 34 abuts against the connecting plate 11 and generates elastic deformation, so as to achieve the purpose of sealing the top cover 1 and the housing 3, and prevent gas from leaking from the connection between the top cover 1 and the housing 3, which affects the operation of the battery pack.

[0065] Specifically, a mounting hole 36 is further provided on the housing 3 , and the explosion-proof valve is mounted on the battery pack through the mounting hole 36 .

[0066] See also Figure 2 and Figure 4 The explosion-proof valve further includes a second sealing ring 5. On the side of the housing 3 away from the fireproof net 2, a second mounting groove 35 is provided around the outer circumference of the through hole 31, and the second sealing ring 5 is located in the second mounting groove 35. When the explosion-proof valve is installed on the battery pack, the second sealing ring 5 plays a role in sealing the two to prevent gas leakage.

[0067] Furthermore, a protrusion 51 is provided on the outer periphery of the second sealing ring 5 , and the sealing effect is improved through the interference fit between the protrusion 51 and the second mounting groove 35 .

[0068] See also Figure 6 , Figure 7 and Figure 8 The second embodiment of the utility model provides an explosion-proof valve, and the component installation method is the same as that of the first embodiment. The main difference from the first embodiment is that the connecting plate 11 and the pressure relief plate 12 are stacked, the connecting plate 11 and the pressure relief plate 12 are located on different planes, and the connecting plate 11 is located on the side of the outer periphery of the pressure relief plate 12 close to the fireproof net 2; a groove 122 is provided on the pressure relief plate 12 on the side of the top cover 1 close to the fireproof net 2. The weak connection position 13 is located at the connection between the connecting plate 11 and the pressure relief plate 12, and the thickness is relatively thin, which is easy to break through to achieve pressure relief and explosion prevention.

[0069] Furthermore, the connecting plate 11 is weakly connected to the outer periphery of the pressure relief plate 12 to weaken the connection strength between the connecting plate 11 and the pressure relief plate 12 so as to break open the weak connection position 13 .

[0070] Furthermore, the connecting plate 11 and the pressure relief plate 12 may be connected by integral molding, gluing or a soft connection sealing structure.

[0071] Furthermore, a first step structure 22 is provided on the fireproof net 2, and the first step structure 22 is located in the groove 122 and abuts against the pressure relief plate 12, so that the fireproof net 2 can provide support for the top cover 1, protect the top cover 1, and further avoid the risk of the explosion-proof valve being opened externally without preset.

[0072] Furthermore, the solution provided in the second embodiment may be combined with the solution provided in the first embodiment, and the connecting plate 11 and / or the pressure relief plate 12 may be composed of a plurality of connected sub-plates.

[0073] See also Fig. 9 The third embodiment of the utility model provides a sealing device, and the sealing device includes any explosion-proof valve provided in the above embodiments.

[0074] In this embodiment, the sealed box of the battery pack and the energy storage device is sealed and connected to the explosion-proof valve. When the explosion-proof valve is not opened, the sealed box of the battery pack and the energy storage device is in a sealed state. After the explosion-proof valve is opened, the box is connected to the outside. When the pressure in the battery pack is too high, the gas will open the explosion-proof valve through the through hole 31 and the fireproof net 2 to achieve pressure relief and explosion prevention.

[0075] Compared with the prior art, the explosion-proof valve provided by the utility model has the following advantages:

[0076] 1. The utility model provides an explosion-proof valve that automatically destroys the top cover to release pressure when the internal pressure of the external sealing device is high through the coordinated work of the top cover, the fireproof net and the shell; specifically, the through hole opened on the shell defines the basic pressure relief channel; the top cover is closed on the shell and the through hole is closed, which can ensure that the sealing device is isolated from the outside under normal conditions, avoiding safety accidents caused by the entry of foreign objects into the interior; a connecting plate and a pressure relief plate are arranged on the top cover, and a weak connection position is arranged between the two. The existence of the weak connection position makes it easy to break the connection between the connecting plate and the pressure relief plate, thereby achieving the purpose of sealing. The device responds quickly when the internal pressure is too high, and the position of the pressure relief plate corresponds to the through hole, which ensures the accuracy of the pressure relief path; the fireproof net design can effectively block flames and foreign matter during pressure relief; one side of the fireproof net is against the top cover, and the other side is connected to the shell at the through hole, which can provide support for the top cover on the inside to prevent the connecting plate and the pressure relief plate of the top cover from accidentally separating due to the force from the outside; in summary, the explosion-proof valve provided by the utility model can not only prevent the entry of external foreign matter, but also ensure that when the pressure is abnormal, the gas can be released smoothly through the through hole, effectively preventing safety accidents caused by excessive internal pressure of sealed equipment such as battery packs or energy storage devices.

[0077] The utility model provides a simple structural design, low manufacturing cost, better structural stability and performance reliability. When the explosion-proof valve pressure is too high, the weak connection position is opened to achieve pressure relief and explosion prevention. In addition, the fireproof mesh screen is tightly attached to the top cover to prevent external impact and protect the risk of non-preset opening from the outside.

[0078] 2. The utility model provides an explosion-proof valve, which realizes pressure relief of the explosion-proof valve by using gas to break open the weak connection points between the pressure relief sub-plates; specifically, when the internal pressure of the explosion-proof valve reaches a set critical value, the weak connection points between the pressure relief sub-plates are squeezed and ruptured, and the opening is rapidly expanded to form a high-speed pressure relief channel.

[0079] 3. The utility model provides an explosion-proof valve, in which the weak connection position is set as a thinning score, so that the weak connection position can be easily broken open; specifically, the weak connection position is set as a thinning score, and the thinning score is an area with a thinner thickness on the top cover. When the pressure in the sealing device is too high, it is easy to break through the top cover through the thinning score, and it is easy to produce through one-piece molding or reprocessing, thereby saving costs.

[0080] 4. The utility model provides an explosion-proof valve, which allows the gas in the sealed device to break through the top cover through the mesh holes by arranging mesh holes on the fireproof net; specifically, a plurality of mesh holes are provided on the fireproof net, and the area of ​​the fireproof net where the mesh holes are provided corresponds to the pressure relief plate. When the pressure in the sealed device is too high, the gas passes through the fireproof net and accurately breaks through the weak connection position of the pressure relief plate area corresponding to the mesh holes, and the mesh structure prevents the splashing of fireworks and ejected materials inside the battery pack, thereby avoiding the risk of secondary combustion.

[0081] 5. The explosion-proof valve provided by the utility model can make the weak connection between the connection plate and the pressure relief plate easier to be opened by arranging the connection plate and the pressure relief plate on different planes, thereby achieving pressure relief of the sealing device;

[0082] Specifically, the connecting plate and the pressure relief plate are located on different planes, and the connecting plate is located on the outer periphery of the pressure relief plate on one side close to the fireproof net; a groove is provided on the pressure relief plate on the side of the top cover close to the fireproof net, so that the weak connection between the connecting plate and the pressure relief plate can be easily opened, and the pressure relief plate is opened by gas to achieve pressure relief and explosion prevention.

[0083] 6. The utility model provides an explosion-proof valve, which enables the fireproof net to fit tightly with the top cover by providing a structure on the fireproof net that cooperates with the groove at the pressure relief plate, and the fireproof net can better protect the top cover; specifically, a first step structure is provided on the fireproof net, and the first step structure is located in the groove and abuts against the pressure relief plate, so that the fireproof net can fit tightly with the top cover, so as to better protect the top cover from external impact and prevent the risk of the top cover being opened unexpectedly.

[0084] 7. The utility model provides an explosion-proof valve, which improves the stability of the fire net installation by arranging a mounting frame on the shell; specifically, the mounting frame is opened in the through hole, and the side of the fire net away from the top cover is connected to the mounting frame, so that the fire net can be stably installed between the shell and the top cover.

[0085] 8. The utility model provides an explosion-proof valve, which stably installs the fireproof net and the shell to prevent the displacement of the fireproof net from affecting the accuracy of the gas in rushing open the weak connection position; specifically, a second step structure is arranged at the edge of the through hole in cooperation with the mounting frame, and the edge of the fireproof net is supported on the second step structure, so that the fireproof net can be installed more firmly in the through hole.

[0086] 9. The utility model provides an explosion-proof valve, which realizes the sealed installation of the explosion-proof valve by means of a first sealing ring and a second sealing ring to prevent the non-preset circulation of gas in the explosion-proof valve; specifically, on a side of the shell close to the fireproof net, a first installation groove is opened around the outer periphery of the through hole, and the first sealing ring is located in the first installation groove; the first sealing ring plays a role in sealing the top cover on the shell to prevent gas leakage from the top cover; on a side of the shell away from the fireproof net, a second installation groove is opened around the outer periphery of the through hole, and the second sealing ring is located in the second installation groove; when the explosion-proof valve is installed on the sealing device, the second sealing ring plays a role in sealing the shell to prevent gas from circulating at the edge of the shell and affecting the operation of the battery pack in the sealing device; in summary, the explosion-proof valve provided by the utility model is internally sealed and sealedly connected to the sealing device, thereby improving the safety and reliability of the operation of the explosion-proof valve.

[0087] 10. The sealing device provided by the utility model has the same beneficial effects as the above-mentioned explosion-proof valve, which will not be described in detail here.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An explosion-proof valve, characterized in that: It includes a top cover, a fireproof net and a shell, a through hole is provided on the shell, the top cover includes a connected connecting plate and a pressure relief plate, a weak connection position is provided between the connecting plate and the pressure relief plate, the connecting plate is fixedly connected to the shell, the position of the pressure relief plate corresponds to the through hole, the fireproof net is arranged at one end of the through hole close to the top cover, one side of the fireproof net is against the top cover, and the other side is connected to the shell at the through hole.

2. An explosion-proof valve according to claim 1, characterized in that: The pressure relief plate includes at least one connected pressure relief sub-plate, and weak connection positions are arranged between adjacent pressure relief sub-plates.

3. An explosion-proof valve according to claim 1, characterized in that: The weak connection point is a thinning notch.

4. An explosion-proof valve according to claim 3, characterized in that: The fireproof net is provided with a plurality of mesh holes, and the area of ​​the fireproof net provided with the mesh holes corresponds to the pressure relief plate.

5. An explosion-proof valve according to claim 1, characterized in that: The connecting plate and the pressure relief plate are located on different planes, and the connecting plate is located on a side of the outer periphery of the pressure relief plate close to the fireproof net; a groove is arranged at the pressure relief plate on a side of the top cover close to the fireproof net.

6. An explosion-proof valve according to claim 5, characterized in that: A first step structure is arranged on the fireproof net, and the first step structure is located in the groove and abuts against the pressure relief plate.

7. An explosion-proof valve according to claim 1, characterized in that: A mounting frame is provided in the through hole, and a side of the fireproof net away from the top cover is connected to the mounting frame.

8. An explosion-proof valve according to claim 7, characterized in that: The edge of the through hole cooperates with the mounting frame to form a second step structure, and the edge of the fireproof net is supported on the second step structure.

9. An explosion-proof valve according to claim 1, characterized in that: It also includes a first sealing ring and a second sealing ring. On a side of the shell close to the fireproof net, a first installation groove is opened around the outer periphery of the through hole, and the first sealing ring is located in the first installation groove; on a side of the shell away from the fireproof net, a second installation groove is opened around the outer periphery of the through hole, and the second sealing ring is located in the second installation groove.

10. A sealing device, characterized in that: The utility model comprises a main body and an explosion-proof valve as claimed in any one of claims 1 to 9 arranged on the main body.

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