Pressure release valve and sealing equipment

Abstract

The utility model relates to the technical field of new energy batteries and energy storage, in particular to a pressure release valve and sealing equipment, which comprise an umbrella valve, a cover body and a valve body, the umbrella valve and the cover body are arranged on the valve body to define a primary channel and a secondary channel; a first mounting hole is formed in the cover body, the umbrella valve is mounted in the first mounting hole, and air holes are formed in the periphery of the first mounting hole; a through hole is formed in the valve body, and the cover body is detachably mounted on the valve body corresponding to the through hole; when the cover body is kept connected with the valve body, a communicating path for communicating the vent hole with the outside through the umbrella valve is a formed first-stage channel; and when the cover body is separated from the valve body, the through hole directly communicated with the outside is a formed secondary channel. The pressure release valve provided by the utility model is used for solving the technical problem that quick pressure release is difficult to realize in a conventional working state and a battery cell thermal runaway working state.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries and energy storage, and particularly relates to a pressure relief valve and a sealing device.

Background Art

[0002] In the design of battery packs and energy storage devices, the battery cells are in a completely sealed box body. The high-temperature and high-pressure gas generated will cause the internal pressure of the sealed box body to rise rapidly. To cope with this characteristic of the battery cells during operation, a pressure relief and explosion-proof valve starts its pressure relief function. When the pressure in the sealed box body rises to the set critical value, the pressure relief valve will be triggered to open, thereby balancing the pressure between the sealed box body and the outside world and ensuring the normal operation of the battery cells.

[0003] However, when the battery cells accidentally cause thermal runaway, the internal pressure of the sealed box body will rise sharply. At this time, the pressure relief function of the pressure relief valve is not sufficient to relieve the pressure quickly, and there is a risk of explosion of the battery pack box body and even flame combustion, which is likely to cause accidents.

Content of the Utility Model

[0004] To solve the technical problem that it is difficult for the pressure relief valve to quickly relieve pressure in both the normal working state and the thermal runaway working state of the battery cells, the utility model provides a pressure relief valve and a sealing device.

[0005] The solution of the utility model to solve the technical problem is to provide a pressure relief valve, which includes an umbrella valve, a cover body and a valve body. The umbrella valve and the cover body are arranged in the valve body to define a primary channel and a secondary channel. A first mounting hole is formed in the cover body, and the umbrella valve is installed in the first mounting hole, and ventilation holes are arranged around the outside of the first mounting hole. A through hole is formed in the valve body, and the cover body is detachably installed on the valve body corresponding to the through hole. When the cover body is connected to the valve body, the communication path through which the ventilation holes communicate with the outside through the umbrella valve forms the primary channel. When the cover body is separated from the valve body, the through hole directly communicating with the outside forms the secondary channel.

[0006] Preferably, the umbrella valve includes an umbrella column, an umbrella skirt and a limiting block. The two ends of the umbrella column are respectively connected to the umbrella skirt and the limiting block. The umbrella column is located in the first mounting hole, and the limiting block is located on the side of the cover body facing the through hole. When there is no external force on the umbrella skirt, it keeps the ventilation holes sealed.

[0007] Preferably, a groove is formed in the cover body, the umbrella skirt is located in the groove, and the first mounting hole and the ventilation holes are located at the bottom of the groove.

[0008] Preferably, the umbrella column is connected to the center of the umbrella skirt. In the natural state of the umbrella valve, the center of the umbrella skirt is flush with the surface of the cover body, and the edge of the umbrella skirt abuts against the bottom surface of the groove.

[0009] Preferably, a ramp structure is provided around the edge of the first mounting hole at the bottom of the groove.

[0010] Preferably, at least one snap is provided on the side of the cover facing the through hole, and a clamping portion is correspondingly provided on the inner wall of the through hole, and the snap is detachably connected to the clamping portion correspondingly.

[0011] Preferably, a limiting portion is provided on the clamping portion corresponding to the snap. When the snap is clamped with the clamping portion, the limiting portion is located on both sides of the snap.

[0012] Preferably, a first sealing ring is further included. On the side of the valve body close to the cover, a first mounting groove is provided corresponding to the edge of the cover, and the first sealing ring is located in the first mounting groove.

[0013] Preferably, a second sealing ring is further included. On the side of the valve body facing away from the cover, a second mounting groove is provided, and the second sealing ring is located in the second mounting groove.

[0014] Another solution for the present utility model to solve the technical problem is to provide a sealing device, including a body and a pressure relief valve provided on the body.

[0015] Compared with the prior art, a pressure relief valve and a sealing device provided by the present utility model have the following advantages:

[0016] 1. For the pressure relief valve provided by the present utility model, the pressure relief of the internal battery cells of the battery pack and the sealed box of the energy storage device under normal operation and thermal runaway states is respectively realized through the primary channel and the secondary channel; specifically, when the battery cells are in normal operation, the battery cells generate heat, causing a weak high pressure in the sealed box. The gas inside the box pushes the umbrella valve through the vent hole to open the primary channel to achieve pressure balance inside and outside the box. After pressure relief, the umbrella valve controls the primary channel to close, and the umbrella valve seals the vent hole again; the process of balancing the pressure inside and outside the box by the umbrella valve can be repeatedly realized, ensuring that the battery pack box has a longer service life during normal operation, and reducing the maintenance and use costs; when the battery cells are accidentally in thermal runaway, the pressure inside the sealed box rises sharply. At this time, the pressure relief function of the umbrella valve is not sufficient to quickly relieve the pressure. The airflow inside the box breaks through the cover and the umbrella valve assembly, opens the secondary channel, and quickly relieves the pressure during the runaway of the battery cells through the through hole, avoiding the tragedy of the explosion of the battery pack box or even the generation of flame combustion caused by the generation of a large amount of high-temperature and high-pressure gas, resulting in property or personal accident losses to the user; in summary, the weak high pressure inside the box caused by the heat generated during the normal operation of the battery cells is realized through the primary channel, and the large pressure generated during the thermal runaway state of the battery cells is realized through the secondary channel, achieving rapid and effective pressure relief in different states of different battery cells and avoiding safety accidents caused by a large amount of accidentally generated high-temperature and high-pressure gas. The assembly process is simple, enabling the user to safely and conveniently use the pressure relief valve.

[0017] 2. A pressure relief valve provided by the present utility model, the umbrella valve plays a role in controlling the primary channel under the normal working state of the battery cell; specifically, the umbrella skirt on the umbrella valve maintains a sealed coverage of the primary channel without external force; when the air pressure difference inside and outside the box reaches the critical value, the airflow pushes the edge of the umbrella skirt through the ventilation holes and releases it to the outside, realizing the circulation of gas and balancing the air pressure inside and outside the box; the limit block plays a role in restricting the movement process of the umbrella valve, preventing the umbrella valve from detaching from the cover under the action of air pressure and affecting the operation of the pressure relief valve, and assisting the umbrella skirt to seal the box in the natural state.

[0018] 3. A pressure relief valve provided by the present utility model, the umbrella skirt is located in the groove to facilitate the umbrella skirt to be flush with the surface of the cover in the natural state, avoiding the protrusion of the umbrella valve and affecting the overall installation of the box and other operations.

[0019] 4. A pressure relief valve provided by the present utility model, the ventilation holes are arranged around the outer periphery of the first mounting hole, and when the airflow flows out, it can apply a uniform thrust to the edge of the umbrella skirt, improving the working efficiency of the umbrella valve and the pressure relief speed; the edge of the umbrella skirt abuts against the cover in the natural state to achieve a sealing effect and prevent gas from flowing out through the ventilation holes and affecting the airtightness of the box.

[0020] 5. A pressure relief valve provided by the present utility model, the ramp structure plays a role in facilitating the installation of the umbrella valve on the cover. Under the guidance of the ramp structure, the limit block reduces the resistance to entering the first mounting hole, the assembly process is simple, it can adapt to automated production, and the cost is saved.

[0021] 6. A pressure relief valve provided by the present utility model, when the battery cell undergoes thermal runaway due to an accident, the internal pressure of the sealed box rises sharply. At this time, the pressure relief function of the umbrella valve is not sufficient to relieve the pressure quickly. The airflow inside the box opens the secondary channel by breaking through the connection between the buckle and the clamping part, the cover and the umbrella valve assembly are separated from the valve body, and an open large pressure relief port is formed on the valve body to quickly perform the pressure relief work during the out-of-control of the battery cell, avoiding the explosion of the battery pack box caused by the generation of a large amount of high-temperature and high-pressure gas.

[0022] 7. A pressure relief valve provided by the present utility model, the limiting part plays a role in restricting the position of the buckle, preventing damage to the buckle caused by shaking, and providing a guiding path for the buckle when the buckle and the clamping part are installed.

[0023] 8. A pressure relief valve provided by the present utility model, the first seal plays a role in sealing the installation of the cover on the valve body, preventing gas from flowing through the connection between the cover and the valve body and affecting the airtightness of the box.

[0024] 9. A pressure relief valve provided by the present utility model, the second sealing ring plays a role in making the pressure relief valve be sealed and installed on the box, preventing gas from flowing through the installation place of the pressure relief valve, and improving the airtightness and safety inside the box.

[0025] 10. The sealing device provided by the present utility model has the same beneficial effects as the above-mentioned pressure relief valve, which will not be elaborated here.

Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of a pressure relief valve provided by the first embodiment of the present utility model.

[0027] Figure 2 It is an exploded schematic view of a pressure relief valve provided by the first embodiment of the present utility model Figure 1 .

[0028] Figure 3 It is an exploded schematic view of a pressure relief valve provided by the first embodiment of the present utility model Figure 2 .

[0029] Figure 4 It is a schematic cross-sectional view of a pressure relief valve provided by the first embodiment of the present utility model.

[0030] Figure 5 It is a schematic structural diagram of the cover body provided by the first embodiment of the present utility model.

[0031] Figure 6 It is a schematic structural diagram of a sealing device provided by the second embodiment of the present utility model.

[0032] Description of the reference numerals in the drawings:

[0033] 1. Umbrella valve; 2. Cover body; 3. Valve body; 4. First sealing ring; 5. Second sealing ring; 6. Embedded part; 7. Sealing device;

[0034] 11. Umbrella skirt; 12. Umbrella column; 13. Limit block; 21. First mounting hole; 22. Vent hole; 23. Groove; 24. Slope structure; 25. Buckle; 31. Through hole; 32. Clamping part; 33. First mounting groove; 34. Second mounting groove; 35. Second mounting hole; 51. Protrusion; 61. Protruding part; 71. Body; 72. Pressure relief valve;

[0035] 251. Fixing part; 321. Limiting part; 351. Fitting groove.

Detailed Description of the Embodiments

[0036] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0037] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model are used to distinguish different objects, rather than to describe a specific order.

[0038] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0039] In the present utility model, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present utility model and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0040] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present utility model can be understood according to the specific circumstances.

[0041] In addition, the terms "installed", "set", "provided with", "connected", "connected to" 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 directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0042] Please refer to Figure 1 and Figure 2, the first embodiment of the present utility model provides a pressure relief valve, which includes an umbrella valve 1, a cover body 2 and a valve body 3. The umbrella valve 1 and the cover body 2 are arranged on the valve body 3 to define a primary channel and a secondary channel; a first mounting hole 21 is formed on the cover body 2, the umbrella valve 1 is installed in the first mounting hole 21, and ventilation holes 22 are arranged around the outside of the first mounting hole 21; a through hole 31 is formed on the valve body 3, and the cover body 2 is detachably installed on the valve body 3 corresponding to the through hole 31; when the cover body 2 is connected to the valve body 3, the communication path through which the ventilation holes 22 communicate with the outside through the umbrella valve 1 is the formed primary channel; when the cover body 2 is detached from the valve body 3, the through hole 31 directly communicating with the outside is the formed secondary channel.

[0043] It can be understood that the pressure relief valve provided by the present utility model realizes the pressure relief work of the battery pack and the sealed box body of the energy storage device under the normal working condition and the thermal runaway state of the battery cells through the primary channel and the secondary channel respectively; specifically, in the normal working state of the battery cells, the battery cells generate heat, causing a weak high pressure in the sealed box body. The gas inside the box body pushes the umbrella valve 1 through the ventilation holes 22 to open the primary channel to achieve the pressure balance inside and outside the box body. After the pressure relief, the umbrella valve 1 seals the ventilation holes 22 again to control the closing of the primary channel; the balance process of the pressure inside and outside the box body by the umbrella valve 1 can be repeated to ensure that during normal operation, the umbrella valve 1 can continuously complete the pressure relief inside the battery cells through the control of the primary channel, and the battery pack box body has a longer service life, reducing the maintenance and use costs; when the battery cells accidentally cause thermal runaway, the pressure inside the sealed box body rises sharply. At this time, the pressure relief function of the capacity of the umbrella valve 1 and the ventilation holes 22 is not sufficient to quickly relieve the pressure. The airflow inside the box body pushes open the components of the cover body 2 and the umbrella valve 1, opens the secondary channel, and quickly relieves the pressure during the thermal runaway of the battery cells through the through hole 31, avoiding the explosion of the battery pack box body caused by the generation of a large amount of high-temperature and high-pressure gas, and even the tragedy of flame combustion, resulting in property or personal accident losses to the user; during the process of the pressure relief valve completing the pressure relief work, the valve body 3 remains intact, so it can be reused and can be repeatedly combined with the complete cover body 2 and the umbrella valve 1 for pressure relief and explosion prevention; after the secondary channel is opened, if the structure of the cover body 2 is not damaged and is detachably connected to the valve body 3 again, the pressure relief valve can reproduce the process of opening the secondary channel, improving the utilization rate of the cover body 2 and reducing the cost; in summary, the pressure relief valve provided by the present utility model realizes the relief of the weak high pressure inside the box body caused by the heat generated during the normal working process of the battery cells through the primary channel, and realizes the relief of the large pressure generated during the thermal runaway state of the battery cells through the secondary channel, achieving a fast and effective pressure relief and explosion prevention process under different states of different battery cells, avoiding safety accidents caused by a large amount of accidentally generated high-temperature and high-pressure gas, with a simple assembly process and high utilization rate, enabling the user to safely and conveniently use the pressure relief valve and the battery pack.

[0044] It can be understood that when the pressure in the sealed box rises to a preset critical value, the first-level channel and the second-level channel will be triggered to open. Due to the small size of the vent hole 22, the gas outlet volume is limited, and the pressure relief capacity of the umbrella valve 1 is limited, so the rapidly rising pressure generated under the condition of thermal runaway of the battery cell cannot be quickly released. Therefore, the balance of the pressure inside and outside the box is achieved by opening the second-level channel. The exhaust channel generated by the second-level channel is larger than the exhaust channel generated by the first-level channel, and the second-level channel has a higher pressure relief rate.

[0045] It can be understood that the critical value for triggering the second-level channel is greater than the critical value for triggering the first-level channel.

[0046] In this embodiment, the umbrella valve 1 can meet the pressure relief requirements under a low pressure of 4-5 Kpa, and the critical value for opening the second-level channel is greater than 5 Kpa.

[0047] Please refer to Figure 2 and Figure 4 , the umbrella valve 1 includes an umbrella skirt 11, an umbrella column 12 and a limit block 13. The two ends of the umbrella column 12 are respectively connected to the umbrella skirt 11 and the limit block 13. The umbrella column 12 is located in the first installation hole 21, and the limit block 13 is located on the side of the cover 2 facing the through hole 31; when there is no external force on the umbrella skirt 11, it keeps the vent hole 22 sealed and covered, and keeps the first-level channel sealed and covered; when the air pressure difference inside and outside the box reaches the critical value, the air flow passes through the vent hole 22 to push the edge of the umbrella skirt 11 and release it to the outside, realizing the circulation of gas and balancing the air pressure inside and outside the box; the cross-sectional area of the limit block 13 is larger than that of the first installation hole 21, so that the umbrella column 12 can be stably installed in the first installation hole 21. The limit block 13 plays a role in restricting the movement process of the umbrella valve 1, preventing the umbrella valve 1 from detaching from the cover 2 under the action of air pressure and affecting the working of the pressure relief valve, and assisting the umbrella skirt 11 to seal the box in the natural state.

[0048] It can be understood that the umbrella skirt 11 has a certain elasticity, so that the air flow inside the box can push the umbrella skirt 11 through the vent hole 22, and after the air pressure inside and outside the box is balanced, the umbrella skirt 11 can return to the state of sealing and covering the vent hole 22. The above process can be repeated to ensure the normal service life of the battery cell and the battery pack. In addition, when the umbrella skirt 11 covers the vent hole 22, the sealing performance between the umbrella skirt 11 and the cover 2 is improved by the elastic deformation of the edge area of the umbrella skirt 11 that abuts against the surface of the cover 2, avoiding the risk of gas leakage through the edge of the umbrella skirt 11 from the vent hole 22.

[0049] Preferably, the umbrella valve 1 is made of silica gel, so that the umbrella valve 1 has excellent airtightness, can withstand large pressure and tensile force, is not easy to tear or damage, and thus ensures the long-term sealing effect of the first-level channel.

[0050] Further, a groove 23 is formed on the cover body 2. The umbrella skirt 11 is located in the groove 23, and the first mounting hole 21 and the air vent 22 are located at the bottom of the groove 23. The umbrella skirt 11 being located in the groove 23 prevents the outward protrusion of the umbrella valve 1 from affecting the overall installation of the box body and other operations. The umbrella skirt 11 can cover and seal the air vent 22 in the natural state to control the closing of the primary channel and prevent the air flow in the primary channel from affecting the airtightness of the box body.

[0051] It can be understood that the area of the groove 23 is larger than that of the umbrella skirt 11 to accommodate the umbrella skirt 11, and the depth of the groove 23 is set in cooperation with the umbrella skirt 11, and the top of the umbrella skirt 11 does not protrude above the groove 23. The groove 23 serves to protect the umbrella skirt 11.

[0052] Further, the groove 23 coincides with the overall center of the cover body 2. The first mounting hole 21 is located at the center of the cover body 2. The umbrella post 12 is connected to the center of the umbrella skirt 11. In the natural state of the umbrella valve 1, the center of the umbrella skirt 11 is flush with the surface of the cover body 2, and the edge of the umbrella skirt 11 abuts against the bottom surface of the groove 23. Since the air vent 22 is arranged around the outer periphery of the first mounting hole 21, connecting the umbrella post 12 to the center of the umbrella skirt 11 can enable the umbrella skirt 11 to evenly cover the air vent 22, and when the air flows out, a uniform thrust can be applied to the edge of the umbrella skirt 11, improving the working efficiency of the umbrella valve 1 and the pressure relief speed.

[0053] Further, a slope structure 24 is arranged around the edge of the first mounting hole 21 at the bottom of the groove 23.

[0054] It can be understood that the slope structure 24 serves to facilitate the installation of the umbrella valve 1 on the cover body 2. The limiting block 13 is installed on one side of the cover body 2 facing the through hole 31 through the guidance of the slope structure 24, reducing the resistance to entering the first mounting hole 21. The assembly process is simple, can adapt to automated production, and saves costs.

[0055] Please refer to Figure 2 、 Figure 3 and Figure 5 , at least one buckle 25 is arranged on the surface of the cover body 2 facing the through hole 31, and a clamping portion 32 is correspondingly arranged on the inner wall of the through hole 31. The buckle 25 and the clamping portion 32 are detachably connected correspondingly. When the battery cell undergoes thermal runaway due to an accident, the internal pressure of the sealed box body rises sharply. At this time, the pressure relief function of the umbrella valve 1 is not sufficient to relieve the pressure quickly. The air flow in the box body opens the secondary channel by releasing the connection between the buckle 25 and the clamping portion 32. The cover body 2 and the umbrella valve 1 assembly are separated from the valve body 3, and the through hole 31 on the valve body 3 directly serves as an open large pressure relief port to quickly perform the pressure relief work during the thermal runaway of the battery cell, avoiding the explosion of the battery pack box body caused by the generation of a large amount of high-temperature and high-pressure gas, and improving the safety and stability of the pressure relief valve during operation.

[0056] As a feasible implementation mode, when the air pressure in the box body opens the secondary channel, the connection between the buckle 25 and the snap-on part 32 can be destroyed by directly destroying the buckle 25, or the buckle 25 and the snap-on part 32 can be set to be elastically connected. The air pressure applies a force to the connection between the buckle 25 and the snap-on part 32 to cause at least one of them to deform, thereby releasing the elastic connection relationship, and the structure of the cover body 2 after being separated from the valve body 3 remains intact and can be reused, thereby reducing costs.

[0057] In this embodiment, three evenly distributed buckles 25 are provided on the cover body 2 to ensure the stability of the cover body 2 installed on the valve body 3. When the battery cell thermally runs away, the airflow in the box only needs to break through the snapping structure of one of the buckles 25 to destroy the connection between the cover body 2 and the valve body 3. Under the impact of rapidly increasing pressure, the assembly of the cover body 2 and the umbrella valve 1 can be quickly pushed open, thereby developing a secondary channel, and the airflow can be released from the through hole 31 to complete the pressure relief work.

[0058] Furthermore, a limiting portion 321 is provided on the clamping portion 32 corresponding to the clamping portion 25, and when the clamping portion 25 is clamped with the clamping portion 32, the limiting portions 321 are located on both sides of the clamping portion 25. The limiting portions 321 limit the position of the clamping portion 25 to prevent the clamping portion 25 from being damaged due to shaking, and provide a guiding path for the clamping portion 25 when the clamping portion 25 is installed with the clamping portion 32.

[0059] Preferably, a fixing portion 251 is provided on one side of the buckle 25 to reduce the shaking degree of the buckle 25, prevent the buckle 25 from being damaged during installation on the clamping portion 32, and improve the stability of the fitting connection between the buckle 25 and the clamping portion 32.

[0060] See also Figure 2 , Figure 3 and Figure 4 The pressure relief valve further includes a first sealing ring 4. A first mounting groove 33 is provided on a side of the valve body 3 close to the cover body 2, corresponding to the edge of the cover body 2. The first sealing ring 4 is located in the first mounting groove 33. The first sealing ring 4 has the effect of sealing the cover body 2 on the valve body 3, so as to prevent the gas from flowing through the connection between the cover body 2 and the valve body 3 and affecting the airtightness of the box.

[0061] Furthermore, the pressure relief valve further includes a second sealing ring 5. The valve body 3 is provided with a second installation groove 34 on a side facing away from the cover body 2, and the second sealing ring 5 is located in the second installation groove 34. The second sealing ring 5 has the effect of sealing the pressure relief valve on the box body, preventing gas from flowing through the installation position of the pressure relief valve, and improving the airtightness and safety of the inside of the box body.

[0062] Preferably, the first sealing ring 4 and the second sealing ring 5 are made of flexible materials such as rubber or silicone, and the force is enhanced by elastic deformation to improve the airtightness.

[0063] Further, bumps 51 are provided on the inner and outer sides of the second sealing ring 5. When the second sealing ring 5 is installed in the second installation groove 34, the bumps 51 abut against the inner wall of the second installation groove 34, and the elastic deformation occurs to increase the acting force between the second sealing ring 5 and the second installation groove 34, so that the installation of the second sealing ring 5 in the second installation groove 34 is more firm, and the sealing effect of the second sealing ring 5 is improved.

[0064] Specifically, a second installation hole 35 is further opened on the valve body 3, and the pressure relief valve is installed outside the box body through the second installation hole 35, improving the safety and stability of the pressure relief valve during operation.

[0065] Further, the pressure relief valve further includes an embedded part 6, and the embedded part 6 is injection-molded in the second installation hole 35 and cooperates with the nut, serving as a strength reinforcing part for the locking nut, making the installation of the pressure relief valve more stable.

[0066] Further, a protruding part 61 is provided on the outer periphery of the middle part of the embedded part 6, and a mating groove 351 is correspondingly opened on the inner wall of the second installation hole 35. The embedded part 6 is stably installed in the second installation hole 35 through the cooperation of the protruding part 61 and the mating groove 351, preventing the embedded part 6 from detaching from the valve body 3 after being combined with the nut.

[0067] Further, the hardness of the embedded part 6 is greater than that of the valve body 3 to increase the acting force of the second installation hole 35 on the nut, achieving the purpose of locking the nut.

[0068] Preferably, the embedded part 6 is made of metal to improve the cooperation degree between the embedded part 6 and the nut.

[0069] The embedded part 6 serves as a strength reinforcing part for strengthening the locking nut, improving the strength and stability of the pressure relief valve installed on the surface of the box body.

[0070] In summary, please refer to Figures 1 to 5 , the working process and principle of the pressure relief valve provided by the first embodiment of the present invention are briefly described as follows:

[0071] The pressure relief valve is hermetically installed on the battery pack and the sealed box body of the energy storage device. When the battery cells inside the box body are in normal operation, a weak high pressure is generated. The air flow passes through the ventilation holes 22 and pushes the umbrella skirt 11 to flow to the outside. The pressure relief valve controls the opening of the first-level channel through the umbrella valve 1 to achieve the balance of the air pressure inside and outside the box body. After the pressure relief and explosion prevention are completed, the umbrella valve 1 returns to the state of closing the first-level channel to avoid affecting the operation of the battery pack; when a thermal runaway of the battery cells occurs accidentally, a large amount of high-temperature and high-pressure gas is quickly generated inside the box body. At this time, the umbrella valve 1 does not have the function of quickly relieving pressure. The excessive pressure breaks through the clamping structure between the buckle 25 and the clamping part 32, thereby pushing open the cover body 2, and directly using the through hole 31 as the second-level channel for pressure relief. The second-level channel has a greater exhaust and pressure relief efficiency, and can reduce the risk of explosion or combustion of the battery pack during the thermal runaway of the battery cells, avoiding the occurrence of dangerous accidents.

[0072] Please refer to Figure 6 , a second embodiment of the present utility model provides a sealing device 7, which includes a body 71 and the pressure relief valve 72 provided in the above first embodiment, and the pressure relief valve 72 is provided on the body 71.

[0073] In this embodiment, the sealing device 7 is a sealed box body of a battery pack and an energy storage device. When the internal battery cells generate air pressure due to heat, pressure relief and explosion prevention are achieved through the pressure relief valve 72, the air pressure inside and outside the box is balanced, and accidents are avoided.

[0074] Compared with the prior art, a pressure relief valve and a sealing device provided by the present utility model have the following advantages:

[0075] 1. A pressure relief valve provided by the present utility model realizes pressure relief for the internal battery cells of the sealed box body of the battery pack and the energy storage device under normal working conditions and thermal runaway conditions through a primary channel and a secondary channel respectively; specifically, when the battery cells are in a normal working state, the battery cells generate heat, causing a weak high pressure in the sealed box body. The gas inside the box body pushes the umbrella valve through the air holes to open the primary channel to achieve pressure balance inside and outside the box. After pressure relief, the umbrella valve controls the primary channel to close, and the umbrella valve seals the air holes again; the process of the umbrella valve balancing the pressure inside and outside the box can be repeated to ensure that the battery pack box body has a longer service life during normal operation, reducing maintenance and use costs; when the battery cells accidentally cause thermal runaway, the pressure inside the sealed box body rises sharply. At this time, the pressure relief function of the umbrella valve is not sufficient to quickly relieve the pressure. The airflow inside the box breaks through the cover body and the umbrella valve assembly, opens the secondary channel, and quickly relieves the pressure when the battery cells are out of control through the through holes, avoiding the explosion of the battery pack box body caused by the generation of a large amount of high-temperature and high-pressure gas, and even the tragedy of flame combustion, resulting in losses to the property or personal accidents of users; in summary, the weak high pressure inside the box caused by the heat generated during the normal operation of the battery cells is achieved through the primary channel, and the increased pressure generated under the thermal runaway state of the battery cells is achieved through the secondary channel, realizing rapid and effective pressure relief under different states of different battery cells, and avoiding safety accidents caused by a large amount of accidentally generated high-temperature and high-pressure gas. The assembly process is simple, enabling users to safely and conveniently use the pressure relief valve.

[0076] 3. A pressure relief valve provided by the present utility model, the umbrella valve plays a role in controlling the primary channel when the battery cells are in a normal working state; specifically, the umbrella skirt on the umbrella valve maintains a sealed coverage of the primary channel without external force; when the air pressure difference inside and outside the box reaches the critical value, the airflow pushes the edge of the umbrella skirt through the air holes and releases it to the outside, realizing the circulation of gas and balancing the air pressure inside and outside the box; the limit block plays a role in restricting the movement process of the umbrella valve, preventing the umbrella valve from detaching from the cover body under the action of air pressure and affecting the operation of the pressure relief valve, and assisting the umbrella skirt to seal the box body in the natural state.

[0077] 3. A pressure relief valve provided by the present utility model. The umbrella skirt is located in the groove, which facilitates keeping the umbrella skirt flush with the surface of the cover body in the natural state, avoiding the protrusion of the umbrella valve and affecting the overall installation of the box body and other operations.

[0078] 4. A pressure relief valve provided by the present utility model. The ventilation holes are arranged around the outer periphery of the first mounting hole. When the air flows out, it can apply a uniform thrust to the edge of the umbrella skirt, improving the working efficiency of the umbrella valve and the pressure relief speed; the edge of the umbrella skirt abuts against the cover body in the natural state to achieve a sealing effect, avoiding the outflow of gas from the ventilation holes and affecting the airtightness of the box body.

[0079] 5. A pressure relief valve provided by the present utility model. The slope structure plays a role in facilitating the installation of the umbrella valve on the cover body. Under the guidance of the slope structure, the limiting block reduces the resistance to entering the first mounting hole. The assembly process is simple, it can adapt to automated production, and cost is saved.

[0080] 6. A pressure relief valve provided by the present utility model. When the battery cell undergoes thermal runaway due to an accident, the internal pressure of the sealed box body rises sharply. At this time, the pressure relief function of the umbrella valve is not sufficient to relieve the pressure quickly. The air flow in the box body breaks through the connection part buckled to the clamping part to open the secondary channel, the cover body and the umbrella valve assembly are separated from the valve body, and an open large pressure relief port is formed on the valve body to quickly carry out the pressure relief work during the thermal runaway of the battery cell, avoiding the explosion of the battery pack box body caused by the generation of a large amount of high-temperature and high-pressure gas.

[0081] 7. A pressure relief valve provided by the present utility model. The limiting part plays a role in restricting the position of the buckle, avoiding damage to the buckle caused by shaking, and providing a guiding path for the buckle when the buckle and the clamping part are installed.

[0082] 8. A pressure relief valve provided by the present utility model. The first sealing member achieves the effect of sealing the installation of the cover body on the valve body, avoiding the flow of gas through the connection between the cover body and the valve body and affecting the airtightness of the box body.

[0083] 9. A pressure relief valve provided by the present utility model. The second sealing ring achieves the effect of sealing the installation of the pressure relief valve on the box body, avoiding the flow of gas through the installation location of the pressure relief valve, and improving the airtightness and safety inside the box body.

[0084] 10. A sealing device provided by the present utility model, and its beneficial effects are the same as those of the above-mentioned pressure relief valve, which will not be elaborated here.

[0085] The above are only the 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 principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A pressure relief valve, characterized in that: It comprises an umbrella valve, a cover body and a valve body, wherein the umbrella valve and the cover body are arranged on the valve body to define a primary channel and a secondary channel; A first mounting hole is provided on the cover body, the umbrella valve is installed in the first mounting hole, and air holes are provided around the first mounting hole; The valve body is provided with a through hole, and the cover body is detachably mounted on the valve body corresponding to the through hole; When the cover body is connected to the valve body, the communication path of the vent hole connecting to the outside through the umbrella valve forms a primary channel; when the cover body is detached from the valve body, the through hole directly connecting to the outside forms a secondary channel.

2. The pressure relief valve according to claim 1, characterized in that: The umbrella valve comprises an umbrella column, an umbrella skirt and a limit block, wherein two ends of the umbrella column are respectively connected to the umbrella skirt and the limit block, the umbrella column is located in the first mounting hole, and the limit block is located on a side of the cover body facing the through hole; when no external force acts on the umbrella skirt, the air vent is kept sealed and covered.

3. A pressure relief valve according to claim 2, wherein: The cover body is provided with a groove, the umbrella skirt is located in the groove, and the first mounting hole and the air vent are located at the bottom of the groove.

4. A pressure relief valve according to claim 3, characterized in that: The umbrella column is connected to the center of the umbrella skirt. When the umbrella valve is in a natural state, the center of the umbrella skirt is flush with the surface of the cover body, and the edge of the umbrella skirt is in contact with the bottom surface of the groove.

5. The pressure relief valve according to claim 3, characterized in that: A slope structure is arranged at the bottom of the groove around the edge of the first mounting hole.

6. The pressure relief valve according to claim 1, characterized in that: At least one buckle is arranged on a surface of the cover body facing the through hole, and a clamping portion is correspondingly arranged on the inner wall of the through hole, and the buckle is correspondingly detachably connected to the clamping portion.

7. The pressure relief valve according to claim 6, characterized in that: The clamping portion is provided with a limiting portion corresponding to the buckle. When the buckle is clamped with the clamping portion, the limiting portion is located at two sides of the buckle.

8. A pressure relief valve according to claim 1, characterized in that: It also includes a first sealing ring. The valve body is provided with a first installation groove on a side close to the cover body, corresponding to the edge of the cover body. The first sealing ring is located in the first installation groove.

9. A pressure relief valve according to claim 1, characterized in that: It also includes a second sealing ring. The valve body is provided with a second installation groove on a side facing away from the cover body, 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 a pressure relief valve as claimed in any one of claims 1 to 9 arranged on the main body.

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