Energy storage apparatus having explosion venting function, explosion venting structure, and energy storage system

Abstract

An energy storage apparatus (1) having an explosion venting function, an explosion venting structure (20), and an energy storage system (1000). The energy storage apparatus (1) comprises a housing (10), an explosion venting plate (30), and a battery module (60). The energy storage apparatus (1) further comprises a stud (46) and a screw (42) used to fasten the explosion venting plate (30) to the housing (10). One end of the stud (46) is sealed and fixedly connected to an inner surface (31) of the explosion venting plate (30) facing an accommodating cavity (101), the stud (46) protrudes toward the accommodating cavity (101), an end surface of the other end of an extending direction of the stud (46) is provided with a through hole (461), an overlapping region of the housing (10) and the explosion venting plate (30) is provided with a holding hole (103), and the screw (42) located in the accommodating cavity (101) passes through the holding hole (103) along an extending direction of the screw (42) and is embedded into the through hole (461). The screw (42) and the stud (46) of the energy storage apparatus (1) are built in, and one end of the stud (46) is sealed and fixedly connected to the inner surface (31) of the explosion venting plate (30) facing the accommodating cavity (101), so that the explosion venting plate (30) can be prevented from leaking water or leaking air at the position connected to the stud (46), so as to improve the sealing performance. In addition, an explosion venting channel does not need to be considered, and multi-directional explosion venting can be implemented.

Description

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

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 30, 2023, with application number 202323264755.6 and application name “Energy storage device, explosion relief structure and energy storage system with explosion relief function”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] 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

[0003] Energy storage devices offer high flexibility, reliability, and energy density, and are being increasingly used in large-scale photovoltaic and wind power generation to address intermittent power generation fluctuations. However, the battery modules in these devices carry the risk of combustion and explosion, posing significant risks to their safe use.

[0004] 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 prone to water and air leakage.

[0005] Application Contents

[0006] The embodiments of the present application provide an energy storage device, an explosion relief structure, and an energy storage system with explosion relief functions to solve the problems of poor sealing and poor explosion relief stability of the energy storage device.

[0007] In a first aspect, an embodiment of the present application provides an energy storage device with an explosion-proof function, comprising a shell, an explosion-proof plate and a battery module, wherein the explosion-proof 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-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 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-proof 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.

[0008] In this embodiment, since one end of the stud is sealed and fixedly connected to the inner surface of the explosion venting plate facing the accommodating cavity, 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.

[0009] Furthermore, since the screws and studs are located within the accommodating cavity, the screws sequentially pass through the fixing holes of the gasket and the housing and are fixedly connected to the studs. During explosion venting, the screws cause the gasket to bend, and then the gasket, along with the screws, detach from the housing along with the explosion venting plate to achieve explosion venting. The fixing method of this embodiment allows for quick and easy replacement of the explosion venting plate, studs, and screws as a whole. Furthermore, if the studs were fixed to the housing, replacement of the studs would be more difficult, and in many cases the entire housing would need to be replaced. In this embodiment, however, since the studs are located on the explosion venting plate, and the explosion venting plate is not reused after explosion venting, replacement costs are low and replacement is very convenient.

[0010] In some embodiments, one end of the stud is integrally formed with the inner surface of the explosion venting plate. This integral formation of the stud on the inner surface of the explosion venting plate eliminates the need for openings in the explosion venting plate, improves the sealing performance of the explosion venting plate, and enhances the stability of the fixing between the stud and the explosion venting plate.

[0011] In some embodiments, one end of the stud is welded to the inner surface of the explosion vent plate. By welding the stud to the inner surface of the explosion vent plate, the connection between the stud and the explosion vent plate can be achieved without opening a hole in the explosion vent plate, thereby improving the sealing performance of the explosion vent plate.

[0012] In some embodiments, the housing further includes an adapter positioned within the accommodating cavity. The adapter includes side panels and a bottom panel parallel to the explosion venting plate. The side panels are fixedly connected to the bottom panel. The bottom panel is the area where the housing and the explosion venting plate overlap. The fixing holes are holes formed in the bottom panel. The side panels are fixedly connected to the side walls of the housing. Screws pass through the fixing holes in the bottom panel in sequence along the extension direction and engage with the through holes. In this embodiment, the fixing holes are formed on the bottom panel of the adapter connected to the side walls, thereby facilitating the insertion of screws from within the accommodating cavity outward through the fixing holes and connecting them to the through holes of the studs. In comparison, forming fixing holes in the side walls requires very high precision in the positioning of the fixing holes and is not convenient for subsequent adjustment, greatly increasing the difficulty of manufacturing the side walls. In this embodiment, by forming fixing holes on the bottom panel of the adapter, the position of the adapter to be installed can be adjusted as needed, facilitating the position adjustment of the fixing holes and reducing the difficulty of manufacturing.

[0013] In some embodiments, the energy storage device further comprises a gasket, which is located on a side of the base plate away from the explosion venting plate. The gasket defines an assembly hole extending through the gasket. The diameter of the fixing hole is larger than the maximum radial dimension of the screw. The diameter of the assembly hole is larger than the radial dimension of the screw's shank and smaller than the radial dimension of the screw's head. 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, while the head of the screw cannot pass through the assembly hole. The shank of the explosion venting nail sequentially passes through the assembly hole and the fixing hole to be fixedly connected to the stud. Thus, the explosion venting plate can be fixed to the side wall of the housing via the screw, gasket, fixing hole, and stud.

[0014] In some embodiments, a gap is provided between the other end of the stud and the gasket in the extension direction of the threaded hole, 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.

[0015] 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.

[0016] In some embodiments, the energy storage device further comprises a sleeve, which is sleeved over the stud, with one axially upper end of the sleeve contacting the side of the gasket facing the explosion venting plate, and the other end of the sleeve contacting the side of the explosion venting plate facing the accommodating chamber. In this embodiment, because the sleeve can limit the distance between the gasket and the explosion venting plate to no less than a preset distance, 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 from further decreasing. At this time, it can ensure that the sealing ring between the explosion venting plate and the housing can be squeezed by a strong pressure to ensure sealing, while preventing the gasket from being subjected to greater extrusion force by the screw, thereby ensuring the normal shape of the gasket. Specifically, one end of the sleeve abuts the gasket, and the other end of the sleeve abuts the explosion venting plate, so that the sleeve can limit the distance between the explosion venting plate and the gasket from further decreasing. Moreover, because the sleeve supports the gasket, it can also prevent the gasket from being deformed due to excessive extrusion force on the gasket by the screw.

[0017] In some embodiments, the shell includes a bottom wall and side walls. In the height direction of the shell, the side walls are connected between the bottom wall and the explosion venting plate. The bottom wall, side walls and explosion venting plate enclose 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, the entire surface of the receiving chamber can be opened to perform the explosion venting operation when the explosion is vented, and the explosion venting ability is strong. Moreover, it is only necessary to ensure that the seal between the explosion venting plate and the side wall is in place, which reduces one sealing step. Overall, it can effectively improve the sealing performance of the receiving chamber and better prevent water and air leakage. 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 all 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.

[0018] In some embodiments, the housing includes a bottom wall, a top wall, and a side wall connecting the bottom and top walls. The top wall is provided with an explosion vent. The explosion vent plate is mounted on the top wall and covers the explosion vent. The fixing holes are holes defined in the overlapping region of the top wall and the explosion vent plate. The screws extend sequentially through the fixing holes in the top wall and engage with the through-holes. In this embodiment, since the explosion vent plate is mounted on the top wall, the fixing holes can be defined directly in the top wall, eliminating the need for the adapter described in the previous embodiments.

[0019] 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 safety rope can prevent the explosion venting plate from flying out and injuring anyone. Furthermore, the end of the safety rope fixed to the inner surface is sealed to the inner surface of the explosion venting plate, thereby maintaining a sealed connection between the explosion venting plate and the safety rope, eliminating the need for openings and improving sealing performance.

[0020] 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.

[0021] 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 the current input to the energy storage device or output from the energy storage device.

[0022] 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 or output from the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0024] FIG1 is an application scenario diagram of an energy storage system provided in an embodiment of the present application;

[0025] FIG2 is a schematic structural diagram of an energy storage device provided in an embodiment of the present application;

[0026] FIG3 is a schematic diagram of the exploded structure of the energy storage device in FIG2 ;

[0027] FIG4 is an exploded schematic diagram of the housing, sealing ring, and explosion venting plate in the energy storage device in the embodiment of FIG2 ;

[0028] FIG5 is a schematic structural diagram of the explosion venting plate of the energy storage device in the embodiment of FIG2 from a bottom-up perspective;

[0029] FIG6 is an exploded view of the energy storage device in the embodiment of FIG2 after the side wall portion is cut, viewed from a bottom-up perspective;

[0030] FIG7 is a partial enlarged schematic diagram of point A in FIG6 ;

[0031] FIG8 is a partial cross-sectional view of the energy storage device in FIG2 ;

[0032] FIG9 is a partial cross-sectional view of another energy storage device provided in an embodiment of the present application.

[0033] Description of the drawings: 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, adapter; 161, side panel; 162, bottom panel; 20, explosion venting structure; 30, explosion venting 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

[0034] The following first explains some of the terms involved in the embodiments of this application.

[0035] 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 sequential order. 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.

[0036] In this specification, the terms "perpendicular" and "parallel" are explained.

[0037] Vertical: The vertical 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 structural flatness. It 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.

[0038] Parallel: The parallel defined in this application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism, allowing for situations where the absolute parallelism is not caused by factors such as assembly tolerance, design tolerance, and the 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 parallel.

[0039] FIG1 is an application scenario diagram of an energy storage system 1000 provided in an embodiment of the present application, wherein FIG1 shows that the energy storage system 1000 is applied in three scenarios: a power supply side, a power distribution side, and a user side.

[0040] 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 electrical 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 .

[0041] 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. The energy storage system 1000 on the user side provides users with peak shaving and valley filling mode and stable power quality management.

[0042] FIG2 is a schematic diagram of the structure of an energy storage device 1 provided in an embodiment of the present application; FIG3 is a schematic diagram of the exploded structure of the energy storage device 1 in FIG2 .

[0043] 2 and 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 forms a closed housing 101 with the housing 10. The battery module 60 is located within the housing 101. The explosion relief structure 20 is mounted on the housing 10. When the pressure in the housing 101 suddenly increases (e.g., if the battery module 60 explodes or burns), the explosion relief structure 20 can quickly discharge the air pressure in the housing 101, thereby achieving a rapid pressure reduction and preventing the housing 10 from disintegrating and injuring people.

[0044] The explosion relief structure 20 in this embodiment can be applied not only to the energy storage device 1 in Figure 2, but also to other equipment that requires explosion relief, such as gas tanks for storing high-pressure gas (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.

[0045] The explosion venting structure 20 includes an explosion venting plate 30 and a fastening assembly 40. The explosion venting plate 30 is connected to the housing 10 and encloses a closed accommodating cavity 101 therewith. The fastening assembly 40 is used to secure the explosion venting plate 30 to the housing 10. During explosion venting, if the fastening assembly 40 is damaged or fails, the explosion venting plate 30 may detach from the housing 10.

[0046] 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.

[0047] 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 user operation.

[0048] In some embodiments, an explosion vent 102 for installing an explosion vent structure 20 is provided on the shell 10. 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 required, 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.

[0049] 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.

[0050] In some embodiments, the shape of the housing 10 may be roughly a cuboid, a cube, or other prism shapes.

[0051] It is understandable that the number of explosion relief structures 20 in the energy storage device 1 in the embodiment of the present application can be one, two, or other numbers, and the present application does not make any specific limitation.

[0052] Figure 4 is an exploded schematic diagram of the housing 10, sealing ring 70 and explosion venting plate 30 in the energy storage device 1 in the embodiment of Figure 2; Figure 5 is a structural schematic diagram of the explosion venting plate 30 of the energy storage device 1 in the embodiment of Figure 2 from a bottom-up perspective.

[0053] 4 and 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 enclose a receiving groove with the bottom wall 14 . Specifically, one end of the plurality of side walls 15 is respectively sealedly connected to the bottom wall 14 , and the plurality of side walls 15 are perpendicular to the bottom wall 14 , with the direction perpendicular to the bottom wall 14 being the height direction of the housing 10 . The plurality of side walls 15 enclose an explosion vent 102 at the other end in the height direction of the housing 10 , which is connected to the receiving groove. The explosion vent plate 30 is fixed to the other end of the plurality of side walls 15 by a fastening assembly 40 , and seals the explosion vent 102 to cover the receiving groove, thereby enclosing the receiving groove to form a closed receiving chamber 101. Since the explosion vent plate 30 is fixed to the plurality of side walls 15 by the fastening assembly 40 , the top inner wall of the receiving chamber 101 is completely formed by the explosion vent plate 30 . Moreover, since the explosion venting plate 30 constitutes the top inner wall of the accommodating chamber 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 the embodiment in FIG. 9 ), it has at least the following advantages:

[0054] First, the inner wall of the top surface of the accommodating chamber 101 is completely composed of 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.

[0055] Secondly, compared to 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 seal between the top wall and the side wall 15 at the same time, and it is also necessary to ensure the seal between the top wall and the mounting plate. As long as the sealing effect at 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 thus 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. 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. Overall, 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 venting plate 30 independently constitutes the top inner wall of the accommodating chamber 101, rather than being composed of multiple components (for example, the top wall of the shell 10 and the explosion venting plate 30 are jointly composed), even if water accumulates on the explosion venting plate 30, it will not cause leakage, thereby effectively reducing the risk of leakage.

[0056] 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 conducted 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 promptly 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 this embodiment, since the entire top inner wall of the accommodating cavity 101 is composed of 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 pass through the top wall of the shell 10 for conduction, 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.

[0057] 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 . The sealing ring 70 can enhance the connection sealing performance between the explosion venting plate 30 and the plurality of side walls 15 .

[0058] 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 sequentially connected end to end. The bottom wall 14, the explosion venting plate 30, and the plurality of side walls 15 enclose the accommodating chamber 101, which is generally in the shape of a rectangular parallelepiped. In this embodiment, the front inner wall of the accommodating chamber 101 is formed by the front side wall 151, the rear inner wall of the accommodating chamber 101 is formed by the rear side wall 152, the left inner wall of the accommodating chamber 101 is formed by the left side wall 153, and the right inner wall of the accommodating chamber 101 is formed by the right side wall 154.

[0059] 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 .

[0060] It is understandable that in some other embodiments, the number of explosion venting panels 30 may not be one, for example, the number of explosion venting panels 30 may be two, and two surfaces of the accommodating cavity 101 may also be composed of explosion venting panels 30 .

[0061] In some related embodiments in the art, 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, thereby fixing 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 still poor, and air and water leakage problems are still prone to occur. 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 over time, resulting in poor fixing stability of the explosion venting plate 30.

[0062] Moreover, the gasket 43 has low strength, and too much pressure cannot be applied to the gasket 43 when tightening the screw 42. 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 airtightness 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.

[0063] Figure 6 is an exploded view of the energy storage device 1 in the embodiment of Figure 2 after the side wall 15 is partially cut, viewed from the bottom up, including a schematic diagram of the exploded structure of the fastening assembly 40; Figure 7 is a partial enlarged schematic diagram of point A in Figure 6.

[0064] 6-7 , in 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, because the fastening assembly 40 is connected to the side of the explosion venting plate 30 facing the accommodating chamber 101 and then fixedly connected to the housing 10, this design avoids the need for fixing holes in the explosion venting plate 30 for fixing the explosion venting plate 30, thereby avoiding the problem of poor sealing at the fixing holes, preventing water and air leakage at the fixing holes, and preventing the fastening assembly 40 from rusting due to immersion in water, which would result in poor stability in fixing the explosion venting plate 30.

[0065] 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. The fastening assembly 40 includes a connecting member 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 member 45 seals and covers all areas enclosed by the outer contour of the end face of the fastening assembly 40, that is, the area enclosed by the outer contour of the end face of the fastening assembly 40 is sealed and covers all areas enclosed by the outer contour of the end face of the fastening assembly 40. In this embodiment, since the inner surface 31 seals and covers the area enclosed by the outer contour of the end face of the connecting member 45, it can be ensured that the position where the inner surface 31 of the explosion venting plate 30 is connected to the fastening component 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 component 40, which can prevent the explosion venting plate 30 from leaking water or air at the position where it is connected to the fastening component 40, so as to prevent the fastening component 40 from rusting due to immersion in water, resulting in poor stability in fixing the explosion venting plate 30, and better explosion venting stability.

[0066] 6-8 , in some embodiments, the fastening assembly 40 includes a fastener 41 and a connector 45. The fastener 41 and connector 45 are securely connected to securely connect the explosion venting plate 30 to the housing 10. Because one end of the connector 45 is sealingly connected to the inner surface 31 of the explosion venting plate 30, the fastener 41 and connector 45 do not need to penetrate the explosion venting plate 30 for securement. This eliminates the need for drilling holes in the explosion venting plate 30, thereby improving the overall sealing performance of the explosion venting plate 30 and preventing water and air leakage.

[0067] The fastener 41 and the connector 45 in this embodiment may be a snap-fit ​​connection or a threaded connection.

[0068] In some embodiments, the connecting member 45 is a stud 46 , and the fastener 41 includes a screw 42 .

[0069] In some embodiments, the stud 46 is integrally formed with the inner surface 31 of the explosion vent plate 30. Specifically, one end of the stud 46 is integrally formed with the inner surface 31 of the explosion vent plate 30. Since the stud 46 is integrally formed with the inner surface 31 of the explosion vent plate 30, there is no need to open a hole in the explosion vent plate 30, which can improve the sealing performance of the explosion vent plate 30 and enhance the fixing stability between the stud 46 and the explosion vent plate 30.

[0070] In some embodiments, the stud 46 is welded to the inner surface 31 of the explosion vent plate 30. Specifically, one end of the stud 46 is welded to the inner surface 31 of the explosion vent plate 30. By welding the stud 46 to the inner surface 31 of the explosion vent plate 30, the connection between the stud 46 and the explosion vent plate 30 can be achieved without opening a hole in the explosion vent plate 30, thereby improving the sealing performance of the explosion vent plate 30.

[0071] 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. This can also improve the sealing performance of the explosion venting plate 30.

[0072] 6-8 , in some embodiments, the stud 46 protrudes toward the accommodating cavity 101. A through-hole 461 is provided on the end surface of the other end of the stud 46 in the extension direction. A fixing hole 103 is provided in the overlapping region between the housing 10 and the explosion venting plate 30. The screw 42 located within the accommodating cavity 101 passes through the fixing hole 103 along the extension direction X of the screw 42 and engages with the through-hole 461, thereby securely connecting the screw 42 and the stud 46. In this embodiment, the screw 42 and the stud 46 cooperate to secure the explosion venting plate 30 to the top or side of the housing 10. Since the screw 42 and the stud 46 are located within the accommodating cavity 101, the screw 42 extends from the inside of the accommodating cavity 101 to the outside of the accommodating cavity 101 during fixation. Consequently, the screw 42, the stud 46, and the like used to secure the explosion venting plate 30 do not pass through the accommodating cavity 101, thereby improving the airtightness of the explosion venting plate 30. Moreover, the screws 42 and the studs 46 are not visible from the outside, so the appearance is more beautiful.

[0073] 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 .

[0074] In some embodiments, the fastener 41 also includes a gasket 43, and the screw 42 first passes through the gasket 43, then passes through the fixing hole 103 on the shell 10, and then is connected to the stud 46. Since the stud 46 is provided on the explosion venting plate 30, during explosion venting, the screw 42 will drive the gasket 43 to bend, and then the gasket 43 is driven by the explosion venting plate 30 together with the screw 42 to detach from the fixing hole 103 of the shell 10. The screw 42, gasket 43 and explosion venting plate 30 fall off from the shell 10 at the same time to achieve explosion venting, thereby facilitating the overall replacement of the explosion venting plate 30 and the fastening assembly 40, and making it faster to assemble a new explosion venting plate 30 and fastening assembly 40. 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, replacement is difficult, and in many cases the entire shell 10 needs to be replaced. In this 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 explosion relief, the replacement cost is low and the replacement is very convenient.

[0075] It is understandable that the strength of the gasket 43 is relatively low, but before the explosion venting, the strength of the gasket 43 is sufficient to limit the relative movement of the explosion venting plate 30 and the shell 10. However, after the explosion venting, 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.

[0076] In some embodiments, the gasket 43 is made of aluminum or an aluminum alloy. Of course, in other embodiments, the gasket 43 can also be made of copper, or some non-metallic material with low strength, such as rubber.

[0077] 3-7 , in some embodiments, the top inner wall of the accommodating chamber 101 is formed by the explosion venting plate 30 , and the housing 10 further includes an adapter 16 positioned within the accommodating chamber 101 . The adapter 16 includes a side panel 161 and a bottom panel parallel to the explosion venting plate 30 . The side panel 161 is fixedly connected to the bottom panel 162 . The bottom panel 162 is the region where the housing 10 and the explosion venting plate 30 overlap. The fixing holes 103 are holes defined in the bottom panel 162 . The side panel 161 is fixedly connected to the side wall 15 of the housing 10 . The screws 42 sequentially pass through the fixing holes 103 in the bottom panel 162 along the extension direction and engage with the through holes 461 . In this embodiment, the fixing holes 103 are defined in the bottom panel 162 of the adapter 16 connected to the side wall 15 , so that the screws 42 can be easily inserted through the fixing holes 103 and connected to the through holes 461 of the studs 46 from within the accommodating chamber 101 toward 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 later 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 according to needs, which facilitates the position adjustment of the fixing hole 103 and reduces the difficulty of production and processing.

[0078] In some embodiments, the bottom plate 162 and the side plate 161 of the adapter 16 are arranged at an angle, such as vertically, to facilitate fixed connection between the side plate 161 and the side wall 15 of the housing 10 .

[0079] In some embodiments, the side panels 161 and bottom panels 162 of the adapter are integrally formed and connected to improve the connection strength between the side panels 161 and bottom panels 162. It is understood that the adapter 16 can be directly connected to the side walls 15 of the housing 10, for example, by bolting the adapter 16 to the side walls 15, directly welding the adapter 16 to the side walls 15, or both welding and bolting. Of course, the adapter 16 can also be indirectly connected to the side walls 15 of the housing 10, for example, by first securing a crossbeam to the side walls 15 of the housing 10 and then securing the adapter 16 to the crossbeam.

[0080] Specifically, the gasket 43 is located on a side of the bottom plate 162 away from the explosion venting plate 30 .

[0081] In some embodiments, the gasket 43 defines an assembly hole 431 extending therethrough. The diameter of the fixing hole 103 is larger than the maximum radial dimension of the screw 42 and smaller than the maximum dimension of the gasket 43. The diameter of the assembly hole 431 is larger than the radial dimension of the shank 421 of the screw 42 and smaller than the radial dimension of the head 422 of the screw 42. The shank 421 of the screw 42 sequentially passes through the assembly hole 431 and the fixing hole 103 and engages with the through hole 461. In this embodiment, the shank 421 of the screw 42 can pass through the assembly hole 431, while the head 422 of the screw 42 cannot pass through the assembly hole 431. The shank 421 of the explosion-venting nail sequentially passes through the assembly hole 431 and the fixing hole 103 and is fixedly connected to the stud 46. Thus, the explosion-venting plate 30 can be fixed to the side wall 15 of the housing 10 via the screw 42, the gasket 43, the fixing hole 103, and the stud 46.

[0082] FIG8 is a partial cross-sectional view of the energy storage device 1 in FIG2 , and the cross-sectional position is located at the position where the fastening assembly 40 is fixed to the explosion venting plate 30 and the housing 10 .

[0083] 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 housing 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 housing 10 .

[0084] 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 one 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.

[0085] It is understandable that the magnitude of the activation 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 activation pressure of the explosion venting plate 30 is, and the less easily the gasket 43 is to deform, the stronger the activation pressure of the explosion venting plate 30 is. It should be noted that the activation pressure in the embodiments of the present application refers to the explosion venting effect of the explosion venting plate 30 when subjected to a pressure reaching the activation pressure. For example, when the pressure in the accommodating chamber 101 reaches the activation pressure, the explosion venting plate 30 will be at least partially separated from the housing 10, thereby achieving the explosion venting effect.

[0086] 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, it is easy to produce metal fatigue 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 loose, the sealing ring 70 between the explosion venting plate 30 and the shell 10 will be squeezed with insufficient strength, and the problem of poor airtightness between the explosion venting plate 30 and the shell 10 is likely to occur.

[0087] To prevent the gasket 43 from bending due to overtightening of the screws 42 and studs 46, and to prevent the sealing ring 70 between the explosion venting plate 30 and the housing 10 from being squeezed and insufficiently strengthened due to overtightening of the screws 42 and studs 46, referring to Figures 6-8, in some embodiments, the fastening assembly 40 further includes a sleeve 47, which is positioned 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 no less than a preset distance. It should be noted that at this preset distance, the sealing ring 70 between the explosion venting plate 30 and the housing 10 can be squeezed by a strong pressure to ensure sealing, while preventing the gasket 43 from being subjected to greater squeezing force by the screws 42, thereby maintaining the normal shape of the gasket 43 and not affecting the activation pressure of the explosion venting plate 30.

[0088] 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 is understandable that the greater the intensity of the squeezing of 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 more easily the gasket 43 is deformed. Since the distance between the gasket 43 and the explosion venting plate 30 can be limited to not less than the preset distance by the sleeve 47, 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, so as to ensure the normal shape of the gasket 43.

[0089] 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 .

[0090] 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 decrease. 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.

[0091] 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 venting 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 venting plate 30 and the gasket 43 from continuing to decrease.

[0092] 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.

[0093] 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.

[0094] Of course, it is also possible to precisely control the length of the stud 46 and provide a sleeve 47 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 rest on the gasket 43, thereby preventing the gasket 43 from bending and deforming.

[0095] 6 , in some embodiments, the energy storage device 1 further includes a safety rope 80, one end of the safety rope 80 is fixed to the inner surface 31, and the other end of the safety rope 80 is connected to the shell 10, and the area enclosed by the outer contour of the end portion 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 venting plate 30 from flying out and injuring people. When the explosion venting plate 30 is used only as the inner wall of one surface of the accommodating chamber 101, connection through the safety rope 80 is more appropriate than hinge connection. In addition, the area enclosed by the outer contour of the end portion of the safety rope 80 fixed to the inner surface 31 is sealed and covered by the inner surface 31, so that the portion where the explosion venting 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.

[0096] FIG9 is a partial cross-sectional view of another energy storage device 1 provided in an embodiment of the present application, the cross-sectional view being taken at the location where the fastening assembly 40 is secured to the explosion venting plate 30 and the housing 10. The primary difference between this embodiment and the previous embodiments is that the housing 10 in this embodiment has a top wall 13, on which the explosion venting plate 30 is mounted. The bottom wall 14, side wall 15, explosion vent 102, fixing hole 103, screw 42, through hole 461, and the like mentioned in the following embodiments can all be referred to in the previous embodiments and will not be described in detail here.

[0097] 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 vent 102. The explosion vent plate 30 is mounted on the top wall 13 and covers the explosion vent 102. The fixing holes 103 are holes formed in the overlapping area of ​​the top wall 13 and the explosion vent plate 30. The screws 42 pass through the fixing holes 103 on the top wall 13 in sequence along the extension direction and engage with the through holes 461. In this embodiment, since the explosion vent plate 30 is mounted on the top wall 13, the fixing holes 103 can be directly formed in the top wall 13, eliminating the need for the adapter 16 described in the previous embodiment.

[0098] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection 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 threaded hole, a gap is provided between the other end of the stud and the gasket.

5. The energy storage device according to any one of claims 1 to 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 any one of claims 1 to 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 6, 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 7, 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 7, 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 8, 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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