Pressure relief structure, battery pack and energy storage power supply

Abstract

The utility model relates to the technical field of batteries, and particularly discloses a pressure relief structure, a battery pack and an energy storage power supply. The pressure relief structure comprises a shell and an anti-explosion valve, the shell is provided with a containing cavity, and the anti-explosion valve is installed on the shell. The shell is provided with an opening communicated with the containing cavity, the anti-explosion valve comprises a rubber cover part, the rubber cover part seals the opening, and the rubber cover part is configured to be at least partially separated from the shell to expose the opening when the air pressure in the containing cavity reaches the preset pressure intensity. According to the pressure relief structure, when the battery cell works normally, the rubber cover part seals the opening to prevent the accommodating cavity from being communicated with the outside of the battery pack, so that vaporous water and liquid water in the external environment are prevented from entering the accommodating cavity. And when the air pressure in the accommodating cavity reaches the preset pressure intensity, the rubber cover part is at least partially separated from the shell to expose the opening, so that the gas in the accommodating cavity is continuously discharged to the outside through the opening at the first time, the risk of battery pack explosion caused by thermal runaway of the battery core is reduced, and the safety of the battery pack is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a pressure relief structure, a battery pack and an energy storage power supply. BACKGROUND

[0002] The battery cell of the energy storage power supply is usually sealed in the shell, and in order to enable the gas released when the battery cell is in thermal runaway to be discharged and reduce the accumulation of the gas in the waterproof cover, a pressure relief structure is further arranged on the shell. However, the pressure relief structure in the related art can enable the gas to flow and block the liquid water from passing through, but it is difficult to block the water vapor, which leads to that the external water vapor can enter the battery cell through the pressure relief structure, thereby reducing the waterproof effect. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a pressure relief structure, a battery pack and an energy storage power supply to solve the technical problem that the existing pressure relief structure is difficult to block the water vapor and the waterproof effect is poor.

[0004] An embodiment of the present application provides a pressure relief structure applied to a battery pack, and the battery pack has a battery cell. The pressure relief structure comprises a shell and an explosion-proof valve. The shell is provided with a receiving cavity configured to accommodate the battery cell, and the explosion-proof valve is installed on the shell. The shell is provided with an opening communicating with the receiving cavity, and the explosion-proof valve comprises a rubber cover portion. The rubber cover portion closes the opening, and is configured to at least partially separate from the shell to expose the opening when the air pressure in the receiving cavity reaches a preset pressure.

[0005] In the pressure relief structure, when the battery cell is in normal operation, the rubber cover portion closes the opening to block the communication between the receiving cavity and the outside of the battery pack, thereby blocking the gaseous water and liquid water in the external environment from entering the receiving cavity, reducing the risk of condensate water formed on the inner wall of the shell, and improving the waterproof effect. When the air pressure in the receiving cavity reaches the preset pressure, the rubber cover portion at least partially separates from the shell to expose the opening, so that the gas in the receiving cavity is continuously discharged to the outside through the opening in the first time, reducing the possibility of gas accumulation in the shell, thereby reducing the risk of explosion of the battery pack caused by thermal runaway of the battery cell and improving the safety of the battery pack.

[0006] In some embodiments of the present application, one side of the shell where the opening is located is defined as a projection face, and the edge of the orthographic projection of the rubber cover portion on the projection face completely covers the opening, and the edge of the orthographic projection is larger than the edge of the opening.

[0007] In the above embodiment, by setting the edge of the orthographic projection of the rubber cover portion to be larger than the edge of the opening, it is helpful to make the edge of the rubber cover portion not be rubbed by the shell during the process of the rubber cover portion separating from the shell, thereby ensuring that the rubber cover portion separates from the shell smoothly and the separation process is more smooth.

[0008] In some embodiments of the present application, the thickness of the rubber cover portion is the same.

[0009] In the above embodiment, by setting the thickness of the glue cover part to be the same, it is beneficial to ensure that the opening in the shell continuously and gently discharges gas, thereby improving the stability of the pressure relief structure.

[0010] In some embodiments of the present application, the glue cover part is circular, and the glue cover part is arched away from the opening.

[0011] In the above embodiment, when the glue cover part is subjected to external pressure, the pressure acts on the arched part of the glue cover part, the outer edge of the glue cover part is pressed towards the shell, and the greater the pressure, the greater the degree of pressing of the outer edge of the glue cover part towards the shell, which is beneficial to make the glue cover part more closely attached to the shell, thereby further improving the waterproof effect of the pressure relief structure.

[0012] In some embodiments of the present application, the edge of the glue cover part is provided with a protrusion, which is configured to surround the opening when the glue cover part closes the opening and abuts against the shell.

[0013] In the above embodiment, when the glue cover part closes the opening, the protrusion surrounds the opening and abuts against the shell. The glue cover part is elastically deformed and generates a pre-tightening force, and the protrusion part is tightly attached to the shell by the action of the pre-tightening force, which is beneficial to improve the sealing effect of the glue cover part on the opening, thereby further reducing the risk of gaseous water and liquid water in the external environment entering the accommodation cavity.

[0014] In some embodiments of the present application, the glue cover part is further provided with a reinforcing rib, which is located on the side of the glue cover part facing the opening, or the reinforcing rib is located on the side of the glue cover part away from the opening.

[0015] In the above embodiment, by providing the reinforcing rib on the glue cover part, it is beneficial to enhance the supporting strength of the glue cover part to ensure that the glue cover part can maintain the unfolded state under a certain pressure.

[0016] In some embodiments of the present application, the explosion-proof valve further comprises a fixing part, which is installed on the side of the glue cover part facing the opening and connected with the shell.

[0017] In the above embodiment, by providing the fixing part, the technician only needs to assemble the fixing part on the shell to realize the installation of the explosion-proof valve, without the need to add additional mounting structures on the glue cover part, which is beneficial to improve the structural strength of the glue cover part and further ensure the sealing of the glue cover part on the opening.

[0018] In some embodiments of the present application, the shell is further provided with a rib plate, which is located on the edge of the opening and surrounds the explosion-proof valve. In the gas discharge direction of the opening, the height of the rib plate is greater than the height of the explosion-proof valve.

[0019] In the above embodiment, during production and installation, the rib plate can block or reduce the direct touching of the explosion-proof valve by the technician, which is beneficial to protect the explosion-proof valve and reduce the risk of touching the explosion-proof valve, thereby prolonging the service life of the explosion-proof valve.

[0020] In some embodiments of the present application, a gap is formed between the rib plate and the edge of the glue cover part. The gap is configured to avoid the edge of the glue cover part during the process of the glue cover part being separated from the shell.

[0021] In the above embodiments, the setting of the gap is beneficial to ensure the normal valve of the battery cell and reduce the risk of jamming or failure to separate the glue cover part from the shell due to the movement interference between the glue cover part and the rib plate.

[0022] In some embodiments of the present application, the material of the glue cover part includes at least one of rubber, silicone and soft PVC. The material of the fixed part includes at least one of rubber, silicone and soft PVC. The fixed part and the glue cover part are integrally formed.

[0023] In the above embodiments, the glue cover part can automatically recover to the state of being sealed in the opening after the air pressure in the accommodating cavity recovers to the initial state by utilizing the deformable performance of the glue cover part, so as to prevent external gas from entering and isolate oxygen, thereby preventing the battery cell from continuing to burn and achieving a certain fire extinguishing effect. At the same time, the fixed part and the glue cover part are integrally formed, which is beneficial to simplify the manufacturing steps of the explosion-proof valve and facilitate manufacturing and production.

[0024] In some embodiments of the present application, the pressure relief structure further includes a waterproof and breathable film, which covers the position of the opening and is located on the side of the glue cover part facing the opening. The waterproof and breathable film is configured to be ruptured when the pressure it bears reaches a preset value, so as to form an exhaust passage at the opening.

[0025] In the above embodiments, by setting the waterproof and breathable film, the waterproof effect of the pressure relief structure can be further improved. When the battery cell is working normally, the glue cover part and the waterproof and breathable film jointly block the communication between the accommodating cavity and the outside of the battery pack, so as to block the gaseous water and liquid water in the external environment from entering the accommodating cavity and reduce the risk of condensate water forming on the inner wall of the shell.

[0026] When the air pressure in the accommodating cavity reaches the preset pressure, the waterproof and breathable film can be broken by the shock wave of the battery cell valve, so as to establish a continuous and stable exhaust passage. Subsequently, the glue cover part at least partially separates from the shell to expose the opening, and the gas in the accommodating cavity continuously discharges to the outside through the opening, thereby reducing the possibility of gas accumulation in the shell and reducing the risk of explosion of the battery pack caused by thermal runaway of the battery cell, and improving the safety of the battery pack.

[0027] An embodiment of the present application provides a battery pack. The battery pack includes a battery cell and a pressure relief structure as described in any of the above embodiments, and the battery cell is accommodated in the shell in the pressure relief structure.

[0028] The battery pack described above includes a pressure relief structure as depicted in any of the preceding embodiments. When the battery cell is operating normally, the rubber cap seals the opening, preventing communication between the containment cavity and the outside of the battery pack. This prevents gaseous and liquid water from entering the containment cavity, reducing the risk of condensation on the inner wall of the casing and improving waterproofing. When the pressure inside the containment cavity reaches a preset pressure, the rubber cap at least partially detaches from the casing to expose the opening, allowing the gas inside the containment cavity to be continuously discharged to the outside through the opening immediately. This reduces the possibility of gas accumulation inside the casing, thereby helping to reduce the risk of battery pack explosion due to thermal runaway of the battery cell and improving the safety of the battery pack.

[0029] One embodiment of this application provides an energy storage power supply. The energy storage power supply includes a housing and a battery pack as described in any of the above embodiments, the battery pack being installed within the housing.

[0030] In the aforementioned energy storage power supply, a battery pack as described in any of the above embodiments is used. When the battery cell is operating normally, the rubber cap seals the opening to prevent communication between the housing cavity and the outside of the battery pack, thereby preventing gaseous and liquid water from entering the housing cavity, reducing the risk of condensation forming on the inner wall of the casing, and improving waterproofing. When the gas pressure inside the housing cavity reaches a preset pressure, the rubber cap at least partially detaches from the casing to expose the opening, allowing the gas inside the housing cavity to be continuously discharged to the outside through the opening immediately, reducing the possibility of gas accumulation inside the casing. This helps to reduce the risk of battery pack explosion due to thermal runaway of the battery cell, improving the safety of the battery pack and thus enhancing the installability of the energy storage power supply. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope.

[0032] Figure 1 A schematic diagram of the pressure relief structure is provided for one embodiment of this application;

[0033] Figure 2 for Figure 1 Schematic diagram of the exploded structure of the pressure relief structure;

[0034] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure of the pressure relief structure cut along section line AA.

[0035] Figure 4 for Figure 3 A magnified view of section V;

[0036] Figure 5 for Figure 1 A schematic diagram of the structure of an explosion-proof valve;

[0037] Figure 6 A structural schematic diagram of a medium energy storage power supply is provided for an embodiment of the present application.

[0038] Figure 7 A structural schematic diagram of a medium energy storage power supply is provided for an embodiment of the present application. Figure 6 A structural schematic diagram of a medium energy storage power supply is provided for an embodiment of the present application.

[0039] Main component symbol explanation:

[0040] 1000, energy storage power supply; 100, battery pack; 200, shell; 10, pressure relief structure; 20, battery cell; 11, shell; 12, explosion-proof valve; 13, waterproof and breathable membrane; 111, accommodating cavity; 112, opening; 113, mounting hole; 114, rib plate; 121, glue cover part; 122, fixing part; 1211, protrusion; 1212, reinforcing rib.

[0041] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. Specific embodiments

[0042] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0044] In the related art, the battery cell of the energy storage power supply is usually sealed in the shell, and at the same time, in order to enable the gas released when the battery cell is in thermal runaway to be discharged and reduce the accumulation of gas in the waterproof cover, a pressure relief structure is also provided on the shell. However, the existing pressure relief structure can enable the gas to flow and block the liquid water from passing through, but it is difficult to block the water vapor, which leads to the external water vapor entering the inside of the battery cell through the pressure relief structure, reducing the waterproof effect.

[0045] An embodiment of the present application provides a pressure relief structure applied to a battery pack, the battery pack having a battery cell. The pressure relief structure includes a shell and an explosion-proof valve, the shell being provided with an accommodating cavity configured to accommodate the battery cell, and the explosion-proof valve being installed on the shell. The shell is provided with an opening communicating with the accommodating cavity, and the explosion-proof valve includes a glue cover part, the glue cover part being sealed in the opening and being configured to at least partially separate from the shell to expose the opening when the air pressure in the accommodating cavity reaches a preset pressure.

[0046] In the pressure relief structure, when the battery cell works normally, the glue cover part is arranged in the opening to block the communication between the accommodating cavity and the outside of the battery pack, so as to prevent gaseous water and liquid water in the external environment from entering the accommodating cavity, reduce the risk of condensate water formed on the inner wall of the shell, and improve the waterproof effect. When the gas pressure in the accommodating cavity reaches the preset pressure, the glue cover part at least partially separates from the shell to expose the opening, so that the gas in the accommodating cavity is continuously discharged to the outside through the opening in the first time, reducing the possibility of gas accumulation in the shell, thereby reducing the risk of explosion of the battery pack caused by thermal runaway of the battery cell, and improving the safety of the battery pack.

[0047] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0048] An embodiment of the present application provides a pressure relief structure 10. The pressure relief structure 10 is applied to a battery pack 100, and the battery pack 100 has a battery cell 20. The pressure relief structure 10 is used to relieve pressure when the battery cell 20 of the battery pack 100 is jetted, so as to reduce the gas pressure in the battery pack 100. It can be understood that in other embodiments, the pressure relief structure 10 can be used in other devices that need to relieve pressure in time.

[0049] As shown in Figures 1 to 3 , the pressure relief structure 10 includes a shell 11 and an explosion-proof valve 12. The shell 11 is provided with an accommodating cavity 111 configured to accommodate the battery cell 20, which is beneficial to isolate the battery cell 20 from the external environment. The explosion-proof valve 12 is installed on the shell 11 to discharge the gas generated by the battery cell 20 when the battery cell 20 works abnormally.

[0050] In some embodiments, when the battery pack 100 works normally, the gas in the battery pack 100 expands due to the heat generated by the normal working of the battery cell 20, so that the internal gas pressure of the battery pack 100 increases. In order to protect the battery pack 100 and prevent the shell 11 of the battery pack from being broken, the explosion-proof valve 12 can be opened to relieve pressure.

[0051] In some embodiments, the explosion-proof valve 12 is provided with a plurality of explosion-proof valves 12, which is helpful to improve the pressure relief efficiency of the pressure relief structure 10. It can be understood that when the battery cell 20 works abnormally, the plurality of explosion-proof valves 12 simultaneously discharge the gas generated by the battery cell 20 from the shell 11.

[0052] In some embodiments, as shown in Figure 2 and Figure 4 , the shell 11 is provided with an opening 112 communicating with the accommodating cavity 111, and the explosion-proof valve 12 includes a glue cover part 121. The glue cover part 121 closes the opening 112, and the glue cover part 121 is configured to at least partially separate from the shell 11 to expose the opening 112 when the gas pressure in the accommodating cavity 111 reaches a preset pressure.

[0053] It should be noted that the preset pressure is greater than the external air pressure, and the preset pressure needs to be set according to the actual situation, which is not limited in the present application. Illustratively, the preset pressure can be 4000pa, that is, when the air pressure in the shell 11 reaches 4000pa, the explosion-proof valve 12 will open to release pressure.

[0054] It should also be noted that the air pressure in the accommodating cavity 111 reaches the preset pressure, on the one hand, due to the heating of the battery cell 20, the thermal expansion and contraction of the gas in the shell 11. On the other hand, due to the design defects, assembly factors or external factors of the battery cell 20, the spray valve phenomenon occurs, and combustible gas such as hydrogen is generated.

[0055] Illustratively, when the battery cell 20 is working normally, the glue cover part 121 closes the opening 112 to block the communication between the accommodating cavity 111 and the outside of the battery pack 100. When the air pressure in the accommodating cavity 111 reaches the preset pressure, the gas in the accommodating cavity 111 will be sprayed outwards like an explosion effect, forming a shock wave.

[0056] When the shock wave reaches the explosion-proof valve 12, it will impact the explosion-proof valve 12. At this time, the glue cover part 121 is at least partially separated from the shell 11 to expose the opening 112, so that the gas in the accommodating cavity 111 is continuously discharged to the outside through the opening 112 in the first time.

[0057] It is worth noting that when the pressure in the accommodating cavity 111 is reduced to below the preset pressure for a sufficient time, the glue cover part 121 can return to the initial state (specifically, the state when the glue cover part 121 closes the opening 112) to prevent external gas from entering.

[0058] By setting the explosion-proof valve 12, on the one hand, it can block the gaseous and liquid water in the external environment from entering the accommodating cavity 111, reduce the risk of condensate water forming on the inner wall of the shell 11, and improve the waterproof effect; on the other hand, it can discharge the gas in the shell 11 in time, prevent the gas from accumulating in the shell 11, and help to avoid thermal runaway of the battery cell 20, and help to prevent the gas pressure from being too high to damage the shell 11, reduce the possibility of explosion of the battery pack 100, and improve the safety of the battery pack 100.

[0059] In some embodiments, as shown in Figure 1 and Figure 2 , the face of the shell 11 where the opening 112 is located is defined as the projection face. The orthographic projection of the glue cover part 121 on the projection face completely covers the opening 112, and the edge of the orthographic projection is greater than the edge of the opening 112.

[0060] By setting the edge of the orthographic projection of the glue cover part 121 to be greater than the edge of the opening 112, it helps to ensure that the edge of the glue cover part 121 is not rubbed by the shell 112 during the process of separating from the shell 112, so that it can be more smoothly separated from the shell 112.

[0061] In some embodiments, as shown in Figure 4 the rubber cover portion 121 is circular, and the rubber cover portion 121 is arched away from the opening 112, which helps the edge of the rubber cover portion 121 to be closer to the shell 11, thereby further improving the waterproof effect of the pressure relief structure 10. For example, the shape of the rubber cover portion 121 is part of a spherical surface.

[0062] It can be understood that when the rubber cover portion 121 is subjected to external pressure, the pressure acts on the arched part of the rubber cover portion 121, and the edge of the rubber cover portion 121 is pressed towards the shell 11, and the greater the pressure, the greater the degree of the outer edge of the rubber cover portion 121 is pressed towards the shell 11, and the closer the rubber cover portion 121 is.

[0063] For example, when the above-mentioned pressure relief structure 10 is subjected to IPX9K high-pressure spray test, high-pressure water is sprayed on the explosion-proof valve 12, and the arched part of the rubber cover portion 121 is deformed and pressed towards the opening 112, so that the explosion-proof valve 12 is more difficult to fall off, and a larger amount of water is prevented from entering, thereby meeting the requirements of the IPX9K test.

[0064] In other embodiments, the rubber cover portion 121 can also be rectangular, square or other shapes, which are not limited in the present application, and those skilled in the art can select according to actual conditions.

[0065] In some embodiments, the thickness of the rubber cover portion 121 is the same, which helps to ensure that the opening 112 continuously and gently discharges gas, and improves the stability of the pressure relief structure 10. It is worth noting that the above-mentioned thickness is the same, which means that the thickness of the whole rubber cover portion 121 is uniform.

[0066] For example, as shown in Figure 4 the rubber cover portion 121 is part of a spherical surface, and the thickness of the spherical rubber cover portion 121 is the same along the radius of curvature direction thereof.

[0067] It can be understood that when the rubber cover portion 121 is at least partially separated from the shell 112 under the action of the shock wave, since the thickness of the rubber cover portion 121 is the same, the distance of the edge of the rubber cover portion 121 away from the shell 112 is the same or similar. In other words, the deformation degree of the rubber cover portion 121 is the same or similar.

[0068] Therefore, the area of the opening 112 exposed by the edge of the rubber cover portion 121 is the same or similar, which helps to ensure that the gas in the accommodating cavity 111 is discharged to the outside through the opening 112 stably and continuously, and avoids the risk of gas turbulence due to the different areas of the opening 112 exposed by the edge of the rubber cover portion 121 caused by the large deformation degree of part of the edge of the rubber cover portion 121 and the small deformation degree of part of the edge of the rubber cover portion 121.

[0069] In some embodiments, the thickness of the glue cover portion 121 is 0.45 mm. In other embodiments, the thickness of the glue cover portion can also be other values, which are not limited in the present application, and can be selected by those skilled in the art according to actual conditions.

[0070] In some embodiments, as shown in Figure 4 and Figure 5 The edge of the glue cover portion 121 is provided with a protrusion 1211, which is configured to surround the opening 112 when the glue cover portion 121 closes the opening 112, and abuts against the shell 11, which is helpful to improve the sealing effect of the glue cover portion 121 on the opening 112, thereby further reducing the risk of gaseous water and liquid water in the external environment entering the containing cavity 111.

[0071] For example, the protrusion 1211 is in the shape of a circular ring, which is installed on the edge of the glue cover portion 121 with the center of the glue cover portion 121 as the center, and the protrusion 1211 is located on the side of the glue cover portion 121 facing the opening 112.

[0072] When the glue cover portion 121 closes the opening 112, the protrusion 1211 surrounds the opening 112 and abuts against the shell 11. The glue cover portion 121 elastically deforms and generates a pre-tightening force, and the protrusion 1211 part is tightly attached to the shell 11 by the action of the pre-tightening force.

[0073] In some embodiments, as shown in Figure 5 The glue cover portion 121 is also provided with a reinforcing rib 1212, which is helpful to enhance the supporting strength of the glue cover portion 121, so as to ensure that the glue cover portion 121 can maintain the unfolded state under a certain pressure.

[0074] For example, the reinforcing rib 1212 is in the shape of a circular ring, which is arranged on the glue cover portion 121 with the center of the glue cover portion 121 as the center.

[0075] In other embodiments, the reinforcing rib 1212 can also be in the shape of a line or other shapes, and can be arranged along the radial direction of the glue cover portion 121, which is not limited in the present application, and can be selected by those skilled in the art according to actual conditions.

[0076] In some embodiments, as shown in Figure 5 The reinforcing rib 1212 is located on the side of the glue cover portion 121 facing the opening 112. By hiding the reinforcing rib 1212 on the inner side of the glue cover portion 121 (specifically, the side facing the opening 112), the aesthetics of the pressure relief structure 10 can be improved.

[0077] In some embodiments, the reinforcing rib 1212 is located on the side of the rubber cover portion 121 away from the opening 112. By arranging the reinforcing rib 1212 on the outer side of the rubber cover portion 121 (specifically, on the side away from the opening 112), the roughness of the outer surface of the explosion-proof valve 12 is increased, which facilitates the disassembly and installation of the explosion-proof valve 12 by the technician.

[0078] In some embodiments, as shown in Figure 4 and Figure 5 , the explosion-proof valve 12 further comprises a fixing portion 122, which is installed on the side of the rubber cover portion 121 facing the opening 112 and is connected with the shell 11. By arranging the fixing portion 122, the technician only needs to assemble the fixing portion 122 on the shell 11 to realize the installation of the explosion-proof valve 12, without the need to additionally arrange mounting structures on the rubber cover portion 121, which is conducive to improving the structural strength of the rubber cover portion 121 and further ensuring the sealing of the rubber cover portion 121 to the opening 112.

[0079] In some embodiments, as shown in Figure 2 and Figure 4 , the shell 11 is provided with a mounting hole 113, which is matched with the fixing portion 122. When the explosion-proof valve 12 needs to be installed on the shell 11, the technician only needs to insert the fixing portion 122 into the mounting hole 113.

[0080] In some embodiments, the shell 11 is provided with a clamping groove (not shown in the figure), and the fixing portion 122 is provided with a clamping buckle (not shown in the figure). When the explosion-proof valve 12 is installed on the shell 11, the clamping buckle is clamped in the clamping groove.

[0081] In other embodiments, the explosion-proof valve 12 can also be installed on the shell 11 in other ways, which are not limited in the present application, and the person skilled in the art can select according to the actual situation.

[0082] In some embodiments, as shown in Figure 1 , Figure 2 and Figure 4 , the shell 11 is further provided with a rib plate 114, which is located at the edge of the opening 112 and surrounds the explosion-proof valve 12. In the gas outlet direction of the opening 112, the height of the rib plate 114 is greater than the height of the explosion-proof valve 12.

[0083] It can be understood that, in the production and installation of the battery pack 100, the rib plate 114 can block or reduce the direct touch of the explosion-proof valve 12 by the technician, which is conducive to reducing the risk of touching the explosion-proof valve 12 and prolonging the service life of the explosion-proof valve 12.

[0084] In some embodiments, a clearance gap (not shown) is formed between the rib 114 and the edge of the cover portion 121. The clearance gap is configured to avoid the edge of the cover portion 121 during the process of the cover portion 121 disengaging from the housing 11. In other words, the maximum diameter of the cover portion 121 during deformation is smaller than the inner diameter of the rib 114.

[0085] Understandably, when the air pressure inside the receiving cavity 111 reaches a preset pressure, the rubber cap 121 will at least partially detach from the housing 11 to expose the opening 112. During the process of the rubber cap 121 detaching from the housing 11, the clearance gap can avoid the edge of the rubber cap 121.

[0086] By setting the clearance, it is beneficial to ensure the venting effect of the explosion-proof valve 12 and reduce the risk that the rubber cover 121 may get stuck or be unable to detach when it comes out of the housing 11 due to the movement interference between the rubber cover 121 and the rib 114.

[0087] In some embodiments, the material of the cap portion 121 includes at least one of rubber, silicone, and soft PVC.

[0088] The rubber cap 121 can utilize its deformable properties to automatically return to the state of the closed opening 112 when the air pressure in the receiving cavity 111 is lower than the preset air pressure, so as to prevent the outside gas from entering, thereby isolating oxygen and preventing the battery cell 20 from continuing to burn, achieving a certain fire extinguishing effect.

[0089] In some embodiments, the hardness of the rubber cap portion is in the range of 30A-90A, which helps to deform and detach from the housing 112 while ensuring that the rubber cap portion 121 has a certain support.

[0090] In some embodiments, the material of the fixing part 122 includes at least one of rubber, silicone, and soft PVC.

[0091] In other embodiments, the cap portion 121 and the fixing portion 122 may also be made of other materials with certain elasticity and heat resistance. This application does not limit this, and those skilled in the art can choose according to the actual situation.

[0092] In some embodiments, the fixing part 122 and the rubber cover part 121 are integrally formed. By adopting an integral forming method, the manufacturing steps of the explosion-proof valve 12 are simplified, making it easier to manufacture and produce.

[0093] In some embodiments, such as Figure 4 As shown, the pressure relief structure 10 also includes a waterproof and breathable membrane 13, which covers the opening 112 and is located on the side of the cap 121 facing the opening 112. The waterproof and breathable membrane 13 is configured to rupture when the pressure it bears reaches a preset value, so that an exhaust channel is formed at the opening 112.

[0094] By setting the waterproof and breathable film 13, the double waterproof of the pressure relief structure 10 can be realized, and the waterproof effect is further improved. When the battery cell 20 is working normally, the glue cover part 121 and the waterproof and breathable film 13 jointly block the communication between the accommodating cavity 111 and the outside of the battery pack 100, so as to block the gaseous water and liquid water in the external environment from entering the accommodating cavity 111, and reduce the risk of condensate water formed on the inner wall of the shell 11.

[0095] When the gas pressure in the accommodating cavity 111 reaches the preset pressure, the waterproof and breathable film 13 can be broken by the shock wave of the jet valve of the battery cell 20, so as to establish a continuous and stable exhaust channel. Subsequently, the glue cover part 121 at least partially separates from the shell 11 to expose the opening 112, and the gas in the accommodating cavity 111 continuously exhausts to the outside through the opening 112, thereby reducing the possibility of gas accumulation in the shell 11, thereby reducing the risk of explosion of the battery pack 100 caused by thermal runaway of the battery cell 20, and improving the safety of the battery pack 100.

[0096] In some embodiments, the pressure relief structure 10 further comprises a bracket (not shown in the figure). The bracket is sealingly arranged at the position of the opening 112 of the shell 11. The outer peripheral edge of the waterproof and breathable film 13 is attached to the bracket. The waterproof and breathable film 13 is sealingly fixed to the shell 11 by the bracket, which helps to eliminate the difference in flatness between the opening 112 and the flat waterproof and breathable film 13, thereby facilitating the encapsulation of the waterproof and breathable film 13 to the opening 112 in a flat state, on the one hand, improving the sealing effect of the encapsulation of the waterproof and breathable film 13, and on the other hand, facilitating the stability of the rupture of the waterproof and breathable film 13 when the pressure reaches the preset value.

[0097] In some embodiments, the bracket is arranged between the waterproof and breathable film 13 and the shell 11, and the waterproof and breathable film 13 is attached to the bracket by glue or double-sided tape, and the bracket is attached to the shell 11 by glue or double-sided tape.

[0098] In some embodiments, the waterproof and breathable film 13 is arranged between the bracket and the shell 11, the waterproof and breathable film 13 is attached to the shell 11 by glue or double-sided tape, and the bracket is attached to the side of the waterproof and breathable film 13 away from the battery shell 11 by glue or double-sided tape.

[0099] For example, the working process of the pressure relief structure 10 provided by the present application is as follows: in the initial state, the gas pressure in the accommodating cavity 111 does not reach the preset pressure. At this time, the glue cover part 121 closes the opening 112, and the glue cover part 121 is in an undeformed state.

[0100] When the gas pressure in the accommodating cavity 111 reaches the preset pressure, the glue cover part 121 at least partially separates from the shell 11, the glue cover part 121 is in a deformed state, and the edge of the glue cover part 121 is tilted away from the opening 112 to expose the opening 112.

[0101] At this time, the gas in the accommodation cavity 111 is rapidly discharged to the outside environment through the opening 112. When the pressure in the accommodation cavity 111 is reduced to below the preset pressure, the rubber cover portion 121 returns to the initial state.

[0102] An embodiment of the present application provides a battery pack 100. The battery pack 100 is used for an energy storage power supply 1000 to store and supply power for the energy storage power supply 1000. The energy storage power supply 1000 is a mobile energy storage device, such as a small portable power supply.

[0103] As shown in Figure 6 and Figure 7 , the battery pack 100 includes the battery cell 20 and the pressure relief structure 10 as described in any of the above embodiments, and the battery cell 20 is accommodated in the shell 11 in the pressure relief structure 10. The battery pack 100 of the present application is provided with the pressure relief structure 10 described above. When the battery cell 20 is normally working, the rubber cover portion 121 closes the opening 112 to block the communication between the accommodation cavity 111 and the outside of the battery pack 100, thereby preventing gaseous water and liquid water in the outside environment from entering the accommodation cavity 111, reducing the risk of condensate water on the inner wall of the shell 11, and improving the waterproof effect.

[0104] When the pressure in the accommodation cavity 111 reaches the preset pressure, the rubber cover portion 121 at least partially separates from the shell 11 to expose the opening 112, so that the gas in the accommodation cavity 111 is continuously discharged to the outside through the opening 112 at the first time, reducing the possibility of gas accumulation in the shell 11, thereby reducing the risk of explosion of the battery pack 100 due to thermal runaway of the battery cell 20, and improving the safety of the battery pack 100.

[0105] An embodiment of the present application provides an energy storage power supply 1000. As shown in Figure 6 and Figure 7 , the energy storage power supply 1000 includes the housing 200 and the battery pack 100 as described in any of the above embodiments, and the battery pack 100 is installed in the housing 200.

[0106] The energy storage power supply 1000 of the present application uses the battery pack 100 described above. When the battery cell 20 is normally working, the rubber cover portion 121 closes the opening 112 to block the communication between the accommodation cavity 111 and the outside of the battery pack 100, thereby preventing gaseous water and liquid water in the outside environment from entering the accommodation cavity 111, reducing the risk of condensate water on the inner wall of the shell 11, and improving the waterproof effect.

[0107] When the air pressure in the accommodating cavity 111 reaches the preset pressure, the glue cover part 121 at least partially separates from the shell 11 to expose the opening 112, so that the gas in the accommodating cavity 111 continuously discharges to the outside through the opening 112 at the first time, reduces the possibility of gas accumulation in the shell 11, thereby reducing the risk of explosion of the battery pack 100 caused by thermal runaway of the battery cell 20, improving the safety of the battery pack 100, and further improving the installability of the energy storage power supply 1000.

[0108] In some embodiments, the energy storage power supply 1000 further comprises a power conversion module (not shown in the figure). The power conversion module is arranged in the shell 200. The shell 200 protects the power conversion module. The power conversion module is electrically connected with the battery pack 100. The power conversion module is used to realize AC / DC conversion control of the output current of the battery pack 100. The energy storage device provided with the power conversion module can be a small portable power supply, a household energy storage power supply 1000, an industrial and commercial energy storage power supply 1000, or a container type energy storage power supply 1000, etc.

[0109] In some embodiments, the power conversion module can be omitted. The energy storage device without the power conversion module can be used independently. The energy storage device without the power conversion module can usually only output DC power. When the energy storage device without the power conversion module is used independently, it can be used in coordination with the energy storage device provided with the power conversion module as a power supply system for providing additional battery capacity.

[0110] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application, and are not used as a limitation on the present application. Any appropriate changes and variations to the above embodiments within the spirit and principles of the present application fall within the scope of the present application.

Claims

1. A pressure relief structure applied to a battery pack having a battery cell, the pressure relief structure comprising: The pressure relief structure comprises: a shell provided with a receiving cavity configured to accommodate the battery cell, the shell being provided with an opening communicating with the receiving cavity; an explosion-proof valve mounted on the shell, the explosion-proof valve comprising a rubber cover portion, the rubber cover portion closing the opening, and the rubber cover portion being configured to at least partially detach from the shell to expose the opening when the air pressure in the receiving cavity reaches a preset pressure.

2. The pressure relief structure of claim 1, wherein, A face of the shell where the opening is located is defined as a projection face, a normal projection of the rubber cover portion on the projection face completely covers the opening, and an edge of the normal projection is larger than an edge of the opening.

3. The pressure relief structure of claim 1, wherein, The rubber cover portion has a same thickness.

4. The pressure relief structure of claim 1, wherein, The rubber cover portion is circular, and the rubber cover portion is arched away from the opening.

5. The pressure relief structure of claim 1, wherein, An edge of the rubber cover portion is provided with a protrusion, the protrusion being configured to surround the opening and abut against the shell when the rubber cover portion closes the opening.

6. The pressure relief structure of claim 1, wherein, The rubber cover portion is further provided with a reinforcing rib, the reinforcing rib being located on a side of the rubber cover portion facing the opening; and / or, the reinforcing rib being located on a side of the rubber cover portion away from the opening.

7. The pressure relief structure of any one of claims 1 to 6, wherein, The explosion-proof valve further comprises a fixing portion mounted on a side of the rubber cover portion facing the opening and connected with the shell.

8. The pressure relief structure of any one of claims 1 to 6, wherein, The shell is further provided with a rib plate, the rib plate being located at an edge of the opening and surrounding the explosion-proof valve; along an air outlet direction of the opening, a height of the rib plate is greater than a height of the explosion-proof valve.

9. The pressure relief structure of claim 8, wherein, An avoidance gap is formed between the rib plate and an edge of the rubber cover portion, the avoidance gap being configured to avoid the edge of the rubber cover portion during a process in which the rubber cover portion detaches from the shell.

10. The pressure relief structure of any one of claims 1 to 6, wherein, The pressure relief structure further comprises a waterproof and breathable membrane, the waterproof and breathable membrane covering a position of the opening and being located on a side of the rubber cover portion facing the opening, the waterproof and breathable membrane being configured to be ruptured when a pressure borne by the waterproof and breathable membrane reaches a preset value, so that an exhaust passage is formed at the opening.

11. A battery pack, characterized by A battery cell and the pressure relief structure according to any one of claims 1 to 10 are included, the battery cell being accommodated in the shell in the pressure relief structure.

12. An energy storage power supply, characterized by, An outer shell and the battery pack according to claim 11 are included, the battery pack being mounted in the outer shell.

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