Energy storage device with explosion venting function, explosion venting structure and energy storage system

Abstract

The utility model relates to an energy storage device with an explosion venting function, an explosion venting structure and an energy storage system. The energy storage device comprises a shell, an explosion venting plate and a battery module. The energy storage device further comprises a stud and a screw which are used for fixing the explosion venting plate and the shell. One end of the stud is fixedly connected with the inner surface, facing the containing cavity, of the explosion venting plate in a sealed mode, the stud protrudes towards the containing cavity, a through hole is formed in the end face of the other end, in the extending direction, of the stud, a fixing hole is formed in the overlapping area of the shell and the explosion venting plate, and the screw located in the containing cavity penetrates through the fixing hole in the extending direction of the screw and is embedded into the through hole. According to the energy storage device, the screw and the stud are internally arranged, one end of the stud is fixedly connected with the inner surface, facing the containing cavity, of the explosion venting plate in a sealed mode, water and gas leakage at the position, connected with the stud, of the explosion venting plate can be avoided, and the sealing performance is improved. An explosion venting channel does not need to be considered, and multidirectional explosion venting can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage equipment, and in particular to an energy storage device with explosion relief function, an explosion relief structure and an energy storage system. Background Art

[0002] Energy storage devices have high flexibility, reliability and energy density, and are now gradually being used in large-scale photovoltaic and wind power generation to solve the problem of large intermittent fluctuations in power generation. The battery modules in energy storage devices have the risk of combustion and explosion, which poses a great risk to the safe use of energy storage devices.

[0003] The explosion relief structure in the related art includes an explosion relief plate, screws and gaskets. The screws pass through the gasket and the explosion relief plate in sequence and are fixed to the shell to fix the explosion relief plate to the shell. Since the screws pass through the explosion relief plate, it is easy to leak water and air. Utility Model Content

[0004] The embodiments of the present application provide an energy storage device, an explosion relief structure and an energy storage system with explosion relief function to solve the problems of poor sealing and poor explosion relief stability of the energy storage device.

[0005] In a first aspect, an embodiment of the present application provides an energy storage device with an explosion-proofing function, comprising a shell, an explosion-proofing plate and a battery module, wherein the explosion-proofing plate is located at the top or side of the shell and is surrounded by the shell to form a receiving cavity, and the battery module is located in the receiving cavity; the energy storage device also includes studs and screws for fixing the explosion-proofing plate to the shell; one end of the stud is sealed and fixedly connected to the inner surface of the explosion-proofing plate facing the receiving cavity, the stud protrudes toward the receiving cavity, and the end face of the other end of the stud in the extension direction is provided with a through hole, and a fixing hole is provided in the overlapping area of ​​the shell and the explosion-proofing plate, and the screw located in the receiving cavity passes through the fixing hole along the extension direction of the screw and is embedded in the through hole.

[0006] In the present embodiment, since one end of the stud is sealed and fixedly connected to the inner surface of the explosion venting plate facing the accommodating chamber, it can be ensured that the position where the inner surface of the explosion venting plate is connected to one end of the stud is in a sealed state and is not connected to the outer surface, thereby preventing water and air leakage at the position where the explosion venting plate is connected to one end of the stud, and preventing the screws and studs from rusting due to immersion in water, resulting in poor stability in fixing the explosion venting plate, thereby making the explosion venting stability better.

[0007] In addition, since the screws and studs are located in the accommodating cavity, the screws pass through the fixing holes of the gasket and the shell in turn and are fixedly connected to the studs. When venting the explosion, the screws will drive the gasket to bend, and then the gasket, together with the screws, will be separated from the shell together with the explosion venting plate to achieve explosion venting. The fixing method in this embodiment can easily and quickly replace the explosion venting plate, studs and screws as a whole. Moreover, if the studs are fixed to the shell, it is difficult to replace the studs, and in many cases the entire shell needs to be replaced. In this embodiment, since the studs are located on the explosion venting plate, and the explosion venting plate will not be used again after the explosion, the replacement cost is low and the replacement is very convenient.

[0008] In some embodiments, one end of the stud is integrally formed with the inner surface of the explosion venting plate. Since the stud is integrally formed with the inner surface of the explosion venting plate, there is no need to open a hole in the explosion venting plate, which can improve the sealing performance of the explosion venting plate and improve the fixing stability between the stud and the explosion venting plate.

[0009] In some embodiments, one end of the stud is welded to the inner surface of the explosion venting plate. By welding the stud to the inner surface of the explosion venting plate, the connection between the stud and the explosion venting plate can be achieved without opening a hole in the explosion venting plate, thereby improving the sealing performance of the explosion venting plate.

[0010] In some embodiments, the shell further includes an adapter located in the accommodating cavity, the adapter includes a side plate and a bottom plate parallel to the explosion venting plate, the side plate is fixedly connected to the bottom plate, the bottom plate is the area where the shell and the explosion venting plate overlap, the fixing hole is a hole opened on the bottom plate, the side plate is fixedly connected to the side wall of the shell, and the screws pass through the fixing holes on the bottom plate in sequence along the extension direction and are embedded in the through hole. In this embodiment, the fixing hole is opened on the bottom plate of the adapter connected to the side wall, so that it is convenient to pass the screw through the fixing hole and connect it with the through hole of the stud from the inside of the accommodating cavity to the outside. In comparison, opening a fixing hole on the side wall has very high requirements on the accuracy of the position of the fixing hole, and it is not convenient to adjust it later, and the difficulty of manufacturing the side wall is greatly increased. In this embodiment, by opening a fixing hole on the bottom plate of the adapter, the position where the adapter needs to be installed can be adjusted according to demand, which is convenient for adjusting the position of the fixing hole, and the difficulty of production and processing is low.

[0011] In some embodiments, the energy storage device further includes a gasket, which is located on a side of the bottom plate away from the explosion-proof plate, and the gasket is provided with an assembly hole that passes through the gasket, the aperture size of the fixing hole is larger than the maximum radial size of the screw, the aperture size of the assembly hole is larger than the radial size of the shank of the screw and smaller than the radial size of the head of the screw, and the screw sequentially passes through the assembly hole and the fixing hole and is embedded in the through hole. In this embodiment, the shank of the screw can pass through the assembly hole, and the head of the screw cannot pass through the assembly hole, and the shank of the explosion-proof nail sequentially passes through the assembly hole and the fixing hole to be fixedly connected with the stud, so that the explosion-proof plate can be fixed to the side wall of the shell through the screw, the gasket, the fixing hole and the stud.

[0012] In some embodiments, in the extension direction of the threaded hole, a gap is provided between the other end of the stud and the gasket, so that the depth of the screw entering the through hole of the stud can be adjusted to adjust the size of the gap between the end of the stud with the through hole and the gasket in the extension direction of the screw, thereby adjusting the extrusion strength of the sealing ring between the explosion venting plate and the shell to ensure the sealing effect of the connection between the explosion venting plate and the shell.

[0013] In some embodiments, the other end of the stud contacts the side of the gasket facing the explosion venting plate along the extension direction of the screw. In this embodiment, the other end of the stud abuts against the gasket, thereby further reducing the distance between the gasket and the explosion venting plate and preventing the gasket from bending and deforming.

[0014] In some embodiments, the energy storage device further comprises a sleeve, which is sleeved on the stud, and one axial end of the sleeve contacts the side of the gasket facing the explosion venting plate, and the other end of the sleeve contacts the side of the explosion venting plate facing the accommodating chamber. In this embodiment, since the distance between the gasket and the explosion venting plate can be limited to not less than the preset distance by the sleeve, when the distance between the explosion venting plate and the gasket is reduced to the preset distance, the sleeve can limit the distance between the gasket and the explosion venting plate to be further reduced. At this time, it can ensure that the sealing ring between the explosion venting plate and the shell can be squeezed by a strong pressure to ensure the sealing, and will not cause the gasket to be subjected to a greater extrusion force by the screw to ensure the normal shape of the gasket. Specifically, one end of the sleeve abuts against the gasket, and the other end of the sleeve abuts against the explosion venting plate, so that the distance between the explosion venting plate and the gasket can be limited to be further reduced by the sleeve, and because the sleeve supports the gasket, it can also prevent the gasket from being deformed due to excessive extrusion force of the screw on the gasket.

[0015] In some embodiments, the shell includes a bottom wall and a side wall. In the height direction of the shell, the side wall is connected between the bottom wall and the explosion venting plate. The bottom wall, the side wall and the explosion venting plate are enclosed to form a receiving chamber. In this embodiment, since the inner wall of the top surface of the receiving chamber is completely composed of the explosion venting plate, when the explosion is vented, the entire surface of the receiving chamber can be opened to perform the explosion venting operation, and the explosion venting ability is strong. Moreover, it is only necessary to ensure that the explosion venting plate and the side wall are sealed in place, reducing one sealing step. On the whole, it can effectively improve the sealing performance of the receiving chamber, and the water and air leakage prevention performance is better. Moreover, since the inner wall of the top surface of the receiving chamber is composed of the explosion venting plate, the battery modules in the receiving chamber can correspond well to the explosion venting plate. When any battery module explodes, the explosive gas can reach and impact the explosion venting plate faster, thereby improving the timeliness of the explosion venting of the explosion venting plate.

[0016] In some embodiments, the housing includes a bottom wall, a top wall, and a side wall connecting the bottom wall and the top wall, the top wall is provided with an explosion vent, the explosion vent plate cover is provided on the top wall and covers the explosion vent, the fixing hole is a hole opened in the overlapping area of ​​the top wall and the explosion vent plate, and the screws pass through the fixing holes on the top wall in sequence along the extension direction and are embedded in the through hole. In this embodiment, since the explosion vent plate is installed on the top wall, the fixing hole can be directly opened on the top wall without the need to add the adapter in the previous embodiment.

[0017] In some embodiments, the energy storage device further includes a safety rope, one end of which is sealed and fixed to the inner surface of the explosion venting plate, and the other end of which is connected to the housing. In this embodiment, the explosion venting plate can be restricted from flying out and injuring people by the safety rope. In addition, the end of the safety rope fixed to the inner surface is sealed and connected to the inner surface of the explosion venting plate, so that the portion of the explosion venting plate connected to the safety rope is in a sealed state, and no hole is required, which can improve the sealing performance.

[0018] In the second aspect, an embodiment of the present application provides an explosion-proof structure for connecting to a shell, including an explosion-proof plate, which is located at the top or side of the shell and is surrounded by the shell to form a accommodating cavity; the explosion-proof structure also includes studs and screws for fixing the explosion-proof plate to the shell; one end of the stud is sealed and fixedly connected to the inner surface of the explosion-proof plate facing the accommodating cavity, the stud protrudes toward the accommodating cavity, and the end face of the other end of the stud in the extension direction is provided with a through hole, and a fixing hole is provided in the overlapping area of ​​the shell and the explosion-proof plate, and the screw located in the accommodating cavity passes through the fixing hole along the extension direction of the screw and is embedded in the through hole.

[0019] In a third aspect, an embodiment of the present application provides an energy storage system, comprising a power converter and an energy storage device as described in any one of the first aspects above, wherein the power converter is connected to the energy storage device to perform power conversion on a current input to the energy storage device or output from the energy storage device.

[0020] In a fourth aspect, the present application provides a prefabricated energy storage cabin, comprising a power converter and an energy storage device as described in any one of the first aspects above, wherein the power converter is connected to the energy storage device to perform power conversion on the current input to the energy storage device or output from the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0022] Figure 1 An application scenario diagram of an energy storage system provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the structure of an energy storage device provided in an embodiment of the present application;

[0024] Figure 3 for Figure 2 Schematic diagram of the exploded structure of the energy storage device;

[0025] Figure 4 for Figure 2 An exploded schematic diagram of a housing, a sealing ring and an explosion venting plate in an energy storage device in an embodiment;

[0026] Figure 5 for Figure 2 A schematic structural diagram of the explosion relief plate of the energy storage device in the embodiment from a bottom-up perspective;

[0027] Figure 6 for Figure 2 An exploded view of the energy storage device in the embodiment in the middle embodiment after the side wall portion is cut, viewed from bottom to top;

[0028] Figure 7 for Figure 6 A local enlarged schematic diagram of point A in FIG.

[0029] Figure 8 for Figure 2 A partial cross-sectional view of the energy storage device;

[0030] Fig. 9 A partial cross-sectional view of another energy storage device provided in an embodiment of the present application. Description of the drawings:

[0032] X, extension direction of the screw; L1, spacing; L2, gap; 1000, energy storage system; 1, energy storage device; 2, power converter; 10, shell; 101, accommodating cavity; 102, explosion vent; 103, fixing hole; 11, main body; 12, door panel; 13, top wall; 14, bottom wall; 15, side wall; 151, front side wall; 152, rear side wall; 153, left side wall; 154, right side wall; 16, rotating Connector; 161, side panel; 162, bottom panel; 20, explosion relief structure; 30, explosion relief plate; 31, inner surface; 32, outer surface; 40, fastening assembly; 41, fastener; 42, screw; 421, rod; 422, head; 43, gasket; 431, assembly hole; 45, connector; 46, stud; 461, through hole; 47, sleeve; 60, battery module; 70, sealing ring; 80, safety rope. DETAILED DESCRIPTION

[0033] The following first explains some terms involved in the embodiments of the present application.

[0034] The terms "first", "second", etc. in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] In this specification, the terms "perpendicular", "parallel", etc. are explained.

[0036] Vertical: The verticality defined in this application is not limited to an absolute vertical intersection relationship (angle of 90 degrees). It allows for non-absolute vertical intersection relationships caused by factors such as assembly tolerance, design tolerance, and influence of structural flatness. It also allows for errors in a small angle range. For example, the assembly error range of 80 to 100 degrees can be understood as a vertical relationship.

[0037] Parallelism: The parallelism defined in this application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism, which allows for situations where the absolute parallelism is not caused by factors such as assembly tolerance, design tolerance, and influence of structural flatness. These situations will lead to the sliding fitting part and the first door panel not being absolutely parallel, but this application also defines this situation as parallelism.

[0038] Figure 1 An application scenario diagram of an energy storage system 1000 provided in an embodiment of the present application, wherein: Figure 1 The energy storage system 1000 is shown in three scenarios: applied on the power supply side, the distribution side and the user side.

[0039] Reference Figure 1 The energy storage system 1000 includes an energy storage device 1 and a power converter 2. The energy storage device 1 is connected to the power converter 2. The energy storage device is used to store electric energy. The power converter 2 is used to perform power conversion on the current input to the energy storage device 1 or the current output from the energy storage device 1.

[0040] Among them, the energy storage system 1000 can be used on the power supply side, the distribution side and the user side. For example, the energy storage system 1000 on the power supply side provides storage and output management for the electric energy output by the DC source, the energy storage system 1000 on the distribution side provides intelligent load management for the transmission and distribution side, and the energy storage system 1000 on the user side provides users with peak shaving and valley filling mode and stable power quality management.

[0041] Figure 2 A schematic diagram of the structure of an energy storage device 1 provided in an embodiment of the present application; Figure 3 for Figure 2 Schematic diagram of the exploded structure of the energy storage device 1.

[0042] Reference Figure 2 and Figure 3 The energy storage device 1 includes a housing 10, an explosion relief structure 20, and a battery module 60. The explosion relief structure 20 is connected to the housing 10 and is arranged with the housing 10 to form a closed accommodating chamber 101. The battery module 60 is located in the accommodating chamber 101. The explosion relief structure 20 is installed on the housing 10. When the pressure in the accommodating chamber 101 increases suddenly (such as when the battery module 60 explodes or burns), the gas pressure in the accommodating chamber 101 can be quickly discharged through the explosion relief structure 20, thereby achieving rapid pressure reduction to prevent the housing 10 from disintegrating and injuring people.

[0043] The explosion relief structure 20 in this embodiment can be applied not only to Figure 2 The energy storage device 1 is also applicable to other equipment that requires explosion relief, such as gas tanks for storing high-pressure gases (such as hydrogen, natural gas or nitrogen gas tanks), liquid energy storage systems 1000 (such as liquid nitrogen or liquid hydrogen storage tanks) and certain supercapacitor energy storage systems 1000.

[0044] The explosion relief structure 20 includes an explosion relief plate 30 and a fastening assembly 40. The explosion relief plate 30 is connected to the housing 10 and is surrounded by the housing 10 to form a closed accommodating cavity 101. The fastening assembly 40 is used to fix the explosion relief plate 30 to the housing 10. During explosion relief, the fastening assembly 40 is damaged or fails, and the explosion relief plate 30 is detached from the housing 10.

[0045] The battery module 60 is used for storing and outputting electric energy. Specifically, the battery module 60 includes a plurality of battery packs, and each battery pack includes a plurality of battery cells.

[0046] In some embodiments, the housing 10 includes a main body 11 and a door panel 12 on the main body 11 . The door panel 12 is used to open or close the accommodating cavity 101 , and is also convenient for users to operate.

[0047] In some embodiments, an explosion vent 102 for installing an explosion vent structure 20 is opened on the shell 10, and the explosion vent 102 connects the accommodating chamber 101 with the outside world. The explosion vent plate 30 is installed at the explosion vent 102 and seals the explosion vent 102. When explosion venting is needed, the explosion vent plate 30 opens the explosion vent 102 to discharge the gas in the accommodating chamber 101 to the outside world, thereby achieving directional explosion venting through the explosion vent 102 to prevent the shell 10 from disintegrating and injuring people.

[0048] It is understandable that the explosion venting plate 30 can be installed on the top and side of the shell 10. For example, when the shell 10 is roughly rectangular, the explosion venting plate 30 can be installed on the top wall of the shell 10 or on the side wall of the shell 10.

[0049] In some embodiments, the shape of the housing 10 may also be roughly a cuboid, a cube, or other prisms.

[0050] It is understandable that the number of explosion relief structures 20 in the energy storage device 1 in the embodiment of the present application may be one, two, or any other number, which is not specifically limited in the present application.

[0051] Figure 4 for Figure 2 An exploded schematic diagram of the housing 10, the sealing ring 70 and the explosion relief plate 30 in the energy storage device 1 in the embodiment; Figure 5 for Figure 2 FIG. 1 is a schematic structural diagram of the explosion relief plate 30 of the energy storage device 1 in the embodiment from a bottom-up perspective.

[0052] Reference Figure 4 and Figure 5 In some embodiments, the housing 10 includes a bottom wall 14 and a plurality of side walls 15, the plurality of side walls 15 are respectively connected to the bottom wall 14, and are enclosed with the bottom wall 14 to form a receiving groove. Specifically, one end of the plurality of side walls 15 is respectively sealed and connected to the bottom wall 14, and the plurality of side walls 15 are in a vertical relationship with the bottom wall 14, and the direction perpendicular to the bottom wall 14 is the height direction of the housing 10. The plurality of side walls 15 are enclosed at the other end of the height direction of the housing 10 to form an explosion relief port 102 connected to the receiving groove, and the explosion relief plate 30 is fixed to the other end of the plurality of side walls 15 by the fastening assembly 40, and the explosion relief port 102 is sealed and covered to close the receiving groove to form a closed receiving chamber 101. Since the explosion relief plate 30 is fixed to the plurality of side walls 15 by the fastening assembly 40, the inner wall of the top surface of the receiving chamber 101 is completely formed by the explosion relief plate 30. Moreover, since the explosion venting plate 30 constitutes the top inner wall of the accommodating cavity 101, compared with the solution in which the housing 10 includes a top wall and the explosion venting plate 30 is located on the top wall (such as Fig. 9 Embodiment), has at least the following advantages:

[0053] First, the inner wall of the top surface of the accommodating chamber 101 is completely formed by the explosion relief plate 30, so that when the explosion relief is performed, the entire top surface of the accommodating chamber 101 can be opened to perform the explosion relief operation, and the explosion relief capability is strong.

[0054] Secondly, compared with the solution of first installing the top wall on the side wall 15 and then installing the explosion venting plate 30 on the top wall, it is necessary to ensure the sealing between the top wall and the side wall 15 at the same time, and it is also necessary to ensure the sealing between the top wall and the mounting plate. As long as the sealing effect of one position is poor, it will cause water leakage and air leakage. Moreover, since the explosion venting plate 30 is installed on the top wall of the shell 10, water is easy to accumulate on the top wall, and it is easy to flow to the explosion venting port 102 on the top wall, resulting in great difficulty in sealing the explosion venting plate 30 installed at the explosion venting port 102 on the top wall. In this embodiment, the top inner wall of the accommodating chamber 101 is only composed of the explosion venting plate 30, and it is only necessary to ensure that the explosion venting plate 30 and the side wall 15 are sealed in place, reducing one sealing step. On the whole, it can effectively improve the sealing performance of the accommodating chamber 101, and the water leakage and air leakage prevention performance is better. Moreover, since the explosion-proof plate 30 independently constitutes the top inner wall of the accommodating chamber 101 instead of being composed of multiple components (such as the top wall of the shell 10 and the explosion-proof plate 30), even if water accumulates on the explosion-proof plate 30, it will not cause leakage, thereby effectively reducing the risk of leakage.

[0055] Third, compared with the solution of first installing the top wall on the side wall 15 and then installing the explosion venting plate 30 on the top wall, when the battery module 60 that does not directly correspond to the explosion venting plate 30 in the height direction of the shell 10 explodes, the movement path of the large amount of gas generated is to first impact the top wall head-on and then be transmitted to the explosion venting plate 30 through the top wall. At this time, the movement direction of the gas is roughly horizontal to the explosion venting plate 30, resulting in a small impact force on the explosion venting plate 30, and the explosion venting plate 30 cannot be started normally and timely to vent the explosion. Moreover, since the gas first passes through the top wall before reaching the explosion venting plate 30, the timeliness of the explosion venting is further delayed. In the present embodiment, since the entire top inner wall of the accommodating cavity 101 is formed by the explosion venting plate 30, the battery module 60 in the accommodating cavity 101 can correspond well to the explosion venting plate 30 in the height direction of the shell 10. When any battery module 60 explodes, since there is no need to be conducted through the top wall of the shell 10, the explosion gas can reach and impact the explosion venting plate 30 faster, thereby improving the timeliness of the explosion venting of the explosion venting plate 30.

[0056] In some embodiments, a sealing ring 70 is provided between the explosion venting plate 30 and the end surfaces of the plurality of side walls 15 facing one end of the explosion venting plate 30 , and the sealing ring 70 can enhance the connection sealing performance between the explosion venting plate 30 and the plurality of side walls 15 .

[0057] In some embodiments, the plurality of side walls 15 include a front side wall 151, a rear side wall 152, a left side wall 153, and a right side wall 154. The front side wall 151, the left side wall 153, the rear side wall 152, and the right side wall 154 are connected end to end in sequence, and the receiving chamber 101 formed by the bottom wall 14, the explosion relief plate 30, and the plurality of side walls 15 is generally in the shape of a rectangular parallelepiped. In this embodiment, the front inner wall of the receiving chamber 101 is formed by the front side wall 151, the rear inner wall of the receiving chamber 101 is formed by the rear side wall 152, the left inner wall of the receiving chamber 101 is formed by the left side wall 153, and the right inner wall of the receiving chamber 101 is formed by the right side wall 154.

[0058] It is understandable that, in some other embodiments, the explosion venting plate 30 may not constitute the inner wall of the top surface of the accommodating cavity 101 , but the explosion venting plate 30 may constitute the inner wall of other surfaces of the accommodating cavity 101 .

[0059] It is understandable that in some other embodiments, the number of explosion venting plates 30 may not be one, for example, the number of explosion venting plates 30 may be two, and two surfaces of the accommodating cavity 101 may also be composed of explosion venting plates 30 .

[0060] In some related embodiments of the present invention, a fixing hole is provided on the explosion venting plate 30, and the fastening assembly 40 includes a screw 42, a gasket 43, and a stud 46. The stud 46 is fixedly connected to the housing 10, and the screw 42 passes through the gasket 43, the fixing hole, and the stud 46 in sequence to be fixedly connected, so as to fix the explosion venting plate 30 to the housing 10. In this embodiment, since the fixing hole is provided on the explosion venting plate 30, the fixing hole needs to be sealed, but the sealing effect is poor, and there are still problems of air leakage and water leakage. Moreover, since part of the screw 42 is located outside the accommodating cavity 101, the screw 42 will be wetted by rainwater, and it is easy to corrode and rust after a long time, resulting in poor fixing stability of the explosion venting plate 30.

[0061] Moreover, the gasket 43 has low strength, and too much pressure cannot be applied to the gasket 43 when the screw 42 is tightened. If the screw 42 is tightened too tightly, the gasket 43 will bend, resulting in a change in the starting pressure of the explosion venting plate 30 and poor explosion venting stability. If the screw 42 is tightened too loosely, the air tightness of the position where the screw 42 is installed on the explosion venting plate 30 will be poor, which is prone to water and air leakage.

[0062] Figure 6 for Figure 2 The energy storage device 1 in the embodiment is an exploded view from a bottom-up perspective after the side wall 15 is partially cut, and the figure includes an exploded structural schematic diagram of the fastening assembly 40; Figure 7 for Figure 6 A local enlarged schematic diagram of point A in the middle.

[0063] Reference Figure 6-Figure 7In some embodiments, the fastening assembly 40 is fixedly connected to the side of the explosion venting plate 30 facing the accommodating chamber 101, and is fixedly connected to the housing 10. In this embodiment, since the fastening assembly 40 is connected to the side of the explosion venting plate 30 facing the accommodating chamber 101, and then the explosion venting plate 30 is fixedly connected to the housing 10, such a design can avoid the need to open a fixing hole on the explosion venting plate 30 for fixing the explosion venting plate 30, thereby avoiding the problem of poor sealing at the fixing hole, avoiding water leakage and air leakage at the fixing hole, and avoiding the fastening assembly 40 from rusting due to water immersion, resulting in poor stability of fixing the explosion venting plate 30.

[0064] Specifically, the explosion venting plate 30 includes an inner surface 31 and an outer surface 32 relative to each other, the inner surface 31 faces the accommodating cavity 101, and the outer surface 32 faces away from the accommodating cavity 101, and the fastening assembly 40 includes a connecting piece 45, one end of which is sealed and fixedly connected to the inner surface 31, that is, the area of ​​the inner surface 31 connected to the connecting piece 45 seals and covers all areas enclosed by the outer contour of the end face of the fastening assembly 40, that is, seals and covers all areas enclosed by the outer contour of the end face of the fastening assembly 40. In the present embodiment, since the inner surface 31 seals and covers the area enclosed by the outer contour of the end face of the connecting piece 45, it can be ensured that the position where the inner surface 31 of the explosion venting plate 30 is connected to the fastening assembly 40 is in a sealed state and is not connected to the outer surface 32, that is, it is not connected to the outside of the accommodating chamber 101. The explosion venting plate 30 is in a sealed state at the position where it is connected to the fastening assembly 40, which can prevent the explosion venting plate 30 from leaking water or air at the position where it is connected to the fastening assembly 40, thereby preventing the fastening assembly 40 from rusting due to immersion in water, resulting in poor stability in fixing the explosion venting plate 30, and better explosion venting stability.

[0065] Reference Figure 6-Figure 8 In some embodiments, the fastening assembly 40 includes a fastener 41 and a connector 45. The explosion venting plate 30 is fixedly connected to the housing 10 by the fixed connection of the fastener 41 and the connector 45. Since one end of the connector 45 is sealed and connected to the inner surface 31 of the explosion venting plate 30, when the fastener 41 and the connector 45 are fixedly connected, it is not necessary to pass through the explosion venting plate 30 for fixing, that is, it is not necessary to punch holes on the explosion venting plate 30, thereby improving the overall sealing performance of the explosion venting plate 30 and preventing water leakage and air leakage.

[0066] The fastener 41 and the connector 45 in this embodiment may be snap-fit ​​connections or threaded connections.

[0067] In some embodiments, the connecting member 45 is a stud 46 , and the fastener 41 includes a screw 42 .

[0068] In some embodiments, the stud 46 is integrally formed on the inner surface 31 of the explosion venting plate 30. Specifically, one end of the stud 46 is integrally formed on the inner surface 31 of the explosion venting plate 30. Since the stud 46 is integrally formed on the inner surface 31 of the explosion venting plate 30, there is no need to open a hole on the explosion venting plate 30, which can improve the sealing performance of the explosion venting plate 30 and improve the fixing stability between the stud 46 and the explosion venting plate 30.

[0069] In some embodiments, the stud 46 is welded to the inner surface 31 of the explosion venting plate 30. Specifically, one end of the stud 46 is welded to the inner surface 31 of the explosion venting plate 30. By welding the stud 46 to the inner surface 31 of the explosion venting plate 30, the connection between the stud 46 and the explosion venting plate 30 can be achieved without opening a hole in the explosion venting plate 30, and the sealing performance of the explosion venting plate 30 can be improved.

[0070] In some embodiments, the stud 46 may also be bonded to the inner surface 31 of the explosion venting plate 30. Specifically, one end of the stud 46 is bonded to the inner surface 31 of the explosion venting plate 30. The sealing performance of the explosion venting plate 30 can also be improved.

[0071] Reference Figure 6-Figure 8 In some embodiments, the stud 46 protrudes toward the accommodating chamber 101, and the end surface of the other end in the extension direction of the stud 46 is provided with a through hole 461. The housing 10 and the explosion venting plate 30 overlap with a fixing hole 103. The screw 42 located in the accommodating chamber 101 passes through the fixing hole 103 along the extension direction X of the screw 42 and is embedded in the through hole 461, so that the screw 42 and the stud 46 are fixedly connected. In this embodiment, the explosion venting plate 30 can be fixed to the top or side of the housing 10 by the cooperation of the screw 42 and the stud 46. Since the screw 42 and the stud 46 are located in the accommodating chamber 101, the extension direction of the screw 42 when fixed is from the inside of the accommodating chamber 101 to the outside of the accommodating chamber 101, so that the screw 42, the stud 46, etc. used to fix the explosion venting plate 30 will not pass through the explosion venting plate 30, which can improve the airtightness of the explosion venting plate 30. In addition, the screw 42 and the stud 46, etc. are not visible in appearance, so the appearance is more beautiful.

[0072] In some embodiments, the through hole 461 at the other end of the stud 46 is a threaded hole, and the portion of the screw 42 embedded in the through hole 461 is threadedly connected to the through hole 461 .

[0073] In some embodiments, the fastener 41 also includes a gasket 43, and the screw 42 first passes through the gasket 43 and then passes through the fixing hole 103 on the shell 10, and then is connected to the stud 46. Based on the fact that the stud 46 is arranged on the explosion-proof plate 30, during explosion-proofing, the screw 42 will drive the gasket 43 to bend, and then the gasket 43 is driven by the explosion-proof plate 30 together with the screw 42 to detach from the fixing hole 103 of the shell 10, and the screw 42, the gasket 43 and the explosion-proof plate 30 fall off from the shell 10 at the same time to achieve explosion-proofing, thereby facilitating the overall replacement of the explosion-proof plate 30 and the fastening assembly 40, and assembling a new explosion-proof plate 30 and the fastening assembly 40 is faster. Moreover, when the stud 46 and the screw 42 are threadedly connected, the external thread of the screw 42 and the internal thread of the through hole 461 of the stud 46 will be greatly damaged during explosion relief, resulting in poor fixing stability when the stud 46 is used again, and a new stud 46 often needs to be replaced. If the stud 46 is fixed to the shell 10, it is difficult to replace, and in many cases the entire shell 10 needs to be replaced. In the present embodiment, since the stud 46 is located on the explosion relief plate 30, and the explosion relief plate 30 will not be used again after the explosion relief, the replacement cost is low and the replacement is very convenient.

[0074] It is understandable that the strength of the gasket 43 is relatively low, but before the explosion, the strength of the gasket 43 is sufficient to limit the relative movement between the explosion venting plate 30 and the shell 10. However, after the explosion, the explosion venting plate 30 is subjected to a greater pressure, and the gasket 43 will be deformed. After the gasket 43 is deformed, it can no longer limit the movement of the explosion venting plate 30 relative to the shell 10.

[0075] In some embodiments, the gasket 43 is made of aluminum or aluminum alloy. Of course, in other embodiments, the gasket 43 can also be made of copper, or some non-metallic materials with low strength, such as some rubber materials.

[0076] Reference Figure 3-Figure 7In some embodiments, the inner wall of the top surface of the accommodating chamber 101 is formed by the explosion relief plate 30, and the housing 10 further includes an adapter 16 located in the accommodating chamber 101. The adapter 16 includes a side plate 161 and a bottom plate parallel to the explosion relief plate 30. The side plate 161 is fixedly connected to the bottom plate 162. The bottom plate 162 is the overlapping area of ​​the housing 10 and the explosion relief plate 30. The fixing hole 103 is a hole opened on the bottom plate 162. The side plate 161 is fixedly connected to the side wall 15 of the housing 10. The screw 42 passes through the fixing hole 103 on the bottom plate 162 in sequence along the extension direction and is embedded in the through hole 461. In this embodiment, the fixing hole 103 is opened on the bottom plate 162 of the adapter 16 connected to the side wall 15, so that the screw 42 can be conveniently passed through the fixing hole 103 and connected to the through hole 461 of the stud 46 from the inside of the accommodating chamber 101 to the outside. In comparison, opening the fixing hole 103 on the side wall 15 has very high requirements on the accuracy of the position of the fixing hole 103, and is not convenient for subsequent adjustment, which greatly increases the difficulty in manufacturing the side wall 15. In this embodiment, by opening the fixing hole 103 on the bottom plate 162 of the adapter 16, the position where the adapter 16 needs to be installed can be adjusted as needed, which facilitates the position adjustment of the fixing hole 103 and reduces the difficulty of production and processing.

[0077] In some embodiments, the bottom plate 162 and the side plate 161 of the adapter 16 are arranged at an angle, such as vertically, so as to facilitate fixed connection between the side plate 161 and the side wall 15 of the housing 10 .

[0078] In some embodiments, the side plate 161 and the bottom plate 162 of the adapter are integrally connected to improve the connection strength between the side plate 161 and the bottom plate 162. It is understandable that the adapter 16 can be directly connected to the side wall 15 of the housing 10, for example, the adapter 16 can be directly fixed to the side wall 15 by bolts, or can be directly welded, or can be welded and fixed by bolts. Of course, the adapter 16 can also be indirectly connected to the side wall 15 of the housing 10, for example, by first fixing the crossbeam to the side wall 15 of the housing 10, and then fixing the adapter 16 to the crossbeam.

[0079] Specifically, the gasket 43 is located on a side of the bottom plate 162 away from the explosion relief plate 30 .

[0080] In some embodiments, the gasket 43 is provided with an assembly hole 431 that passes through the gasket 43, the aperture size of the fixing hole 103 is larger than the maximum radial size of the screw 42 and smaller than the maximum size of the gasket 43, the aperture size of the assembly hole 431 is larger than the radial size of the rod 421 of the screw 42 and smaller than the radial size of the head 422 of the screw 42, and the rod 421 of the screw 42 sequentially passes through the assembly hole 431 and the fixing hole 103 and is embedded in the through hole 461. In this embodiment, the rod 421 of the screw 42 can pass through the assembly hole 431, and the head 422 of the screw 42 cannot pass through the assembly hole 431, and the rod 421 of the explosion-proof nail sequentially passes through the assembly hole 431 and the fixing hole 103 and is fixedly connected with the stud 46, so that the explosion-proof plate 30 can be fixed to the side wall 15 of the housing 10 by the screw 42, the gasket 43, the fixing hole 103 and the stud 46.

[0081] Figure 8 for Figure 2 A partial cross-sectional view of the energy storage device 1 in FIG. 1 , wherein the cross-sectional position is located at the position where the fastening assembly 40 is fixed to the explosion relief plate 30 and the housing 10 .

[0082] Reference Figure 8 In some embodiments, a spacing L1 is provided between the adapter 16 and the explosion venting plate 30 in the extension direction X of the screw 42, so that the extrusion strength of the sealing ring 70 between the explosion venting plate 30 and the shell 10 can be adjusted by adjusting the size of the spacing L1 between the explosion venting plate 30 and the adapter 16 to ensure the sealing effect of the connection between the explosion venting plate 30 and the shell 10.

[0083] In some embodiments, in the extension direction X of the screw 42, a gap L2 is provided between one end of the stud 46 having the through hole 461 and the gasket 43, so that the depth of the screw 42 entering the through hole 461 of the stud 46 can be adjusted by rotating the screw 42 to adjust the size of the gap L2 between the end of the stud 46 having the through hole 461 and the gasket 43 in the extension direction X of the screw 42, thereby adjusting the extrusion strength of the sealing ring 70 between the explosion venting plate 30 and the shell 10 to ensure the sealing effect of the connection between the explosion venting plate 30 and the shell 10.

[0084] It is understandable that the starting pressure of the explosion venting plate 30 of the energy storage device 1 is determined to a certain extent by the strength of the gasket 43. The easier the gasket 43 is to deform, the smaller the starting pressure of the explosion venting plate 30 is, and the less likely the gasket 43 is to deform, the stronger the starting pressure of the explosion venting plate 30 is. It should be noted that the starting pressure in the embodiment of the present application refers to the explosion venting effect of the explosion venting plate 30 when it is subjected to a pressure reaching the starting pressure. For example, when the pressure in the accommodating chamber 101 reaches the starting pressure, the explosion venting plate 30 will be at least partially separated from the shell 10, thereby achieving the explosion venting effect.

[0085] In addition, the state of the gasket 43 after being fixed will also affect the starting pressure of the explosion venting plate 30. Since the strength of the gasket 43 is low, metal fatigue is prone to occur and is irreversible. Therefore, when the screw 42 is tightened, if the screw 42 is tightened too much, the gasket 43 is easily damaged or produces irreversible deformation, which in turn affects the starting pressure of the explosion venting plate 30. If the screw 42 is tightened too loosely, the sealing ring 70 between the explosion venting plate 30 and the shell 10 will be squeezed and the strength is insufficient, and the problem of poor airtightness between the explosion venting plate 30 and the shell 10 is prone to occur.

[0086] In order to prevent the gasket 43 from bending due to the screws 42 and the studs 46 being too tight, and to prevent the sealing ring 70 between the explosion relief plate 30 and the housing 10 from being squeezed and insufficient in strength due to the screws 42 and the studs 46 being too loose. Figure 6-Figure 8 In some embodiments, the fastening assembly 40 further includes a sleeve 47, which is located between the explosion venting plate 30 and the gasket 43, and is used to limit the distance between the gasket 43 and the explosion venting plate 30 to be not less than a preset distance. It should be noted that at the preset distance, it can ensure that the sealing ring 70 between the explosion venting plate 30 and the housing 10 can be squeezed by a strong pressure to ensure the sealing, and the gasket 43 will not be subjected to a greater squeezing force by the screw 42, so as to ensure the normal shape of the gasket 43 and will not affect the starting pressure of the explosion venting plate 30.

[0087] Specifically, during the process of continuously tightening the screw 42, the position of the adapter 16 remains unchanged, the position of the gasket 43 remains unchanged, and the screw 42 drives the stud 46 to move toward the gasket 43 along the extension direction X of the screw 42, thereby driving the explosion venting plate 30 to squeeze the sealing ring 70 between the explosion venting plate 30 and the housing 10 along the extension direction X of the screw 42 and move toward the gasket 43. It can be understood that the greater the intensity of squeezing the sealing ring 70 between the explosion venting plate 30 and the housing 10, the smaller the distance between the explosion venting plate 30 and the gasket 43, the greater the pressure on the gasket 43 from the nut of the screw 42, and the easier it is for the gasket 43 to deform. Since the distance between the gasket 43 and the explosion venting plate 30 can be limited by the sleeve 47 to be not less than the preset distance, when the distance between the explosion venting plate 30 and the gasket 43 is reduced to the preset distance, the sleeve 47 can limit the distance between the gasket 43 and the explosion venting plate 30 to be further reduced. At this time, it can ensure that the sealing ring 70 between the explosion venting plate 30 and the shell 10 can be squeezed by a stronger pressure to ensure the sealing, and will not cause the gasket 43 to be subjected to a greater extrusion force by the screw 42 to ensure the normal shape of the gasket 43.

[0088] In some embodiments, the sleeve 47 is sleeved on the stud 46 along the extension direction X of the screw 42 , and the sleeve 47 and the stud 46 are gap-connected, thereby facilitating relative sliding between the sleeve 47 and the stud 46 in the extension direction X of the screw 42 .

[0089] Specifically, when the distance between the explosion venting plate 30 and the gasket 43 reaches a preset distance, in the extension direction X of the screw 42, one end of the sleeve 47 abuts against the gasket 43, and the other end of the sleeve 47 abuts against the explosion venting plate 30, so that the distance between the explosion venting plate 30 and the gasket 43 can be limited by the sleeve 47 to further reduce. Moreover, since the sleeve 47 supports the gasket 43 in the extension direction X of the screw 42, it can also prevent the gasket 43 from being deformed due to excessive squeezing force of the screw 42 on the gasket 43.

[0090] Specifically, the outer diameter of the sleeve 47 is smaller than the fixing hole 103, and the inner diameter of the sleeve 47 is larger than the stud 46. When the distance between the gasket 43 and the explosion-proof plate 30 reaches a preset distance, one end of the sleeve 47 can pass through the fixing hole 103 and abut against the gasket 43 to limit the distance between the explosion-proof plate 30 and the gasket 43 from continuing to decrease.

[0091] In some embodiments, the length of the sleeve 47 in the extension direction X of the screw 42 is equal to the preset distance between the gasket 43 and the explosion venting plate 30, so that when the distance between the gasket 43 and the explosion venting plate 30 reaches the preset distance, one end of the sleeve 47 can pass through the fixing hole 103 and abut against the gasket 43.

[0092] In some other embodiments, the length of the stud 46 may be calculated without providing the sleeve 47. When the distance between the gasket 43 and the explosion venting plate 30 reaches a preset distance, one end of the stud 46 abuts against the gasket 43, thereby further reducing the distance between the gasket 43 and the explosion venting plate 30 and preventing the gasket 43 from bending and deforming.

[0093] Of course, the length of the stud 46 can also be precisely controlled, and a sleeve 47 can be provided at the same time, and the length of the stud 46 is the same as the length of the sleeve 47. When the distance between the gasket 43 and the explosion-proof plate 30 reaches a preset distance, one end of the stud 46 and one end of the sleeve 47 both abut against the gasket 43, thereby preventing the gasket 43 from bending and deforming.

[0094] Reference Figure 6In some embodiments, the energy storage device 1 further includes a safety rope 80, one end of which is fixed to the inner surface 31, and the other end of the safety rope 80 is connected to the housing 10, and the area enclosed by the outer contour of the end of the safety rope 80 fixed to the inner surface 31 is sealed and covered by the inner surface 31. The safety rope 80 can prevent the explosion-proof plate 30 from flying out and injuring people. When the explosion-proof plate 30 is used only as the inner wall of one surface of the accommodating chamber 101, it is more appropriate to connect it through the safety rope 80 than by a hinge connection. In addition, the area enclosed by the outer contour of the end of the safety rope 80 fixed to the inner surface 31 is sealed and covered by the inner surface 31, so that the part where the explosion-proof plate 30 is connected to the safety rope 80 is in a sealed state, and no hole is required, which can improve the sealing performance.

[0095] Fig. 9 A partial cross-sectional view of another energy storage device 1 provided in an embodiment of the present application, the cross-sectional view is located at the position where the fastening assembly 40 is fixed to the explosion venting plate 30 and the housing 10. The main difference between this embodiment and the previous embodiments is that the housing 10 in this embodiment has a top wall 13, and the explosion venting plate 30 is installed on the top wall 13 of the housing 10. The bottom wall 14, side wall 15, explosion venting port 102, fixing hole 103, screw 42, through hole 461, etc. mentioned in the following embodiments can all refer to the previous embodiments, and will not be repeated here.

[0096] Reference Fig. 9 In some embodiments, the housing 10 includes a bottom wall 14, a top wall 13, and a side wall 15 connecting the bottom wall 14 and the top wall 13. The top wall 13 is provided with an explosion venting hole 102. The explosion venting plate 30 is covered on the top wall 13 and covers the explosion venting hole 102. The fixing hole 103 is a hole opened in the overlapping area of ​​the top wall 13 and the explosion venting plate 30. The screw 42 passes through the fixing hole 103 on the top wall 13 in sequence along the extension direction and is embedded in the through hole 461. In this embodiment, since the explosion venting plate 30 is installed on the top wall 13, the fixing hole 103 can be directly opened on the top wall 13, and there is no need to add the adapter 16 in the previous embodiment.

[0097] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An energy storage device with explosion relief function, characterized in that: The energy storage device comprises a shell, an explosion relief plate and a battery module, wherein the explosion relief plate is located at the top or side of the shell and is surrounded by the shell to form a receiving cavity, and the battery module is located in the receiving cavity; The energy storage device also includes a stud and a screw for fixing the explosion relief plate to the shell; one end of the stud is sealed and fixedly connected to the inner surface of the explosion relief plate facing the accommodating cavity, the stud protrudes toward the accommodating cavity, and the end surface of the other end of the stud in the extension direction is provided with a through hole, and the overlapping area of ​​the shell and the explosion relief plate is provided with a fixing hole, and the screw located in the accommodating cavity passes through the fixing hole along the extension direction of the screw and is embedded in the through hole.

2. The energy storage device according to claim 1, characterized in that: The shell also includes an adapter located in the accommodating cavity, the adapter includes a side plate and a bottom plate parallel to the explosion-proof plate, the side plate is fixedly connected to the bottom plate, the bottom plate is the area where the shell and the explosion-proof plate overlap, the fixing hole is a hole opened on the bottom plate, the side plate is fixedly connected to the side wall of the shell, and the screw passes through the fixing holes on the bottom plate in sequence along the extension direction and is embedded in the through hole.

3. The energy storage device according to claim 2, characterized in that: The energy storage device also includes a gasket, which is located on a side of the bottom plate away from the explosion-proof plate. The gasket is provided with an assembly hole that passes through the gasket. The aperture size of the fixing hole is larger than the maximum radial size of the screw. The aperture size of the assembly hole is larger than the radial size of the rod of the screw and smaller than the radial size of the head of the screw. The screw passes through the assembly hole and the fixing hole in sequence and is embedded in the through hole.

4. The energy storage device according to claim 3, characterized in that: In the extending direction of the stud, a gap is provided between the other end of the stud and the gasket.

5. The energy storage device according to claim 3 or 4, characterized in that: The energy storage device also includes a sleeve, which is sleeved on the stud, and an axial end of the sleeve contacts a side of the gasket facing the explosion relief plate, and the other end of the sleeve contacts a side of the explosion relief plate facing the accommodating cavity.

6. The energy storage device according to claim 3, characterized in that: The other end of the stud contacts a surface of the gasket facing the explosion relief plate along the extending direction of the screw.

7. The energy storage device according to any one of claims 1 to 4, characterized in that: One end of the stud is integrally formed or welded with the inner surface of the explosion relief plate.

8. The energy storage device according to any one of claims 1 to 4, characterized in that: The shell comprises a bottom wall and a side wall. In the height direction of the shell, the side wall is connected between the bottom wall and the explosion relief plate. The bottom wall, the side wall and the explosion relief plate enclose the accommodating cavity.

9. The energy storage device according to any one of claims 1 to 4, characterized in that: The shell includes a bottom wall, a top wall and a side wall connecting the bottom wall and the top wall, the top wall is provided with an explosion vent, the explosion vent plate cover is arranged on the top wall and covers the explosion vent, the fixing hole is a hole opened in the overlapping area of ​​the top wall and the explosion vent plate, and the screw passes through the fixing holes on the top wall in sequence along the extension direction and is embedded in the through hole.

10. The energy storage device according to any one of claims 1 to 4, characterized in that: The energy storage device further includes a safety rope, one end of which is sealed and fixed to the inner surface of the explosion relief plate, and the other end of which is connected to the shell.

11. An explosion relief structure, used to be connected to a housing, characterized in that: It includes an explosion relief plate, which is located on the top or side of the shell and is surrounded by the shell to form a containing cavity; The explosion-proof structure also includes a stud and a screw for fixing the explosion-proof plate to the shell; one end of the stud is sealed and fixedly connected to the inner surface of the explosion-proof plate facing the accommodating cavity, the stud protrudes toward the accommodating cavity, and the end surface of the other end of the stud in the extension direction is provided with a through hole, and a fixing hole is provided in the overlapping area of ​​the shell and the explosion-proof plate, and the screw located in the accommodating cavity passes through the fixing hole along the extension direction of the screw and is embedded in the through hole.

12. An energy storage system, characterized in that: It comprises a power converter and an energy storage device as described in any one of claims 1 to 10, wherein the power converter is connected to the energy storage device and is used to perform power conversion on the current input to or output from the energy storage device.

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