Immersed energy-storage device

Abstract

An immersed energy-storage device, comprising a cabinet (300), at least two battery modules (200) stacked in a first direction, and a connector (100), wherein an output end of each battery module (200) extends out of an outer end face of the battery module (200) in a second direction, and the output end of each battery module (200) has a first butt-joint face (2121); both opposite ends of a connecting body (120) of the connector (100) are provided with bent structures (110), and each bent structure (110) has a second butt-joint face (1121); and the bent structures (110) are fixed to the output ends of the battery modules (200) in a threaded manner, and the first butt-joint faces (2121) abut against the second butt-joint faces (1121).

Description

Immersed energy storage device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 27, 2024, with application number 202422386414.4. The entire contents of the above application are incorporated by reference into this application.

[0002] Technical Field

[0003] The present application relates to the field of energy storage technology, for example, to an immersion energy storage device.

[0004] Background Art

[0005] The submerged energy storage cabinet is equipped with multiple battery modules and control systems. All of the battery modules and control systems are immersed in insulating coolant. The multiple battery modules are connected by wiring harnesses. The control system can control the charging and discharging of each battery module, thereby realizing energy storage and release.

[0006] In related technologies, since both the battery module and the control system are immersed in insulating coolant, the wiring harness can vibrate during the circulation of the coolant, causing the connection between the wiring harness and the battery module to loosen, affecting the normal charging and discharging of the battery module. To ensure the normal operation of the battery module, a busbar is used instead of a wiring harness to connect the battery module.

[0007] Technical issues

[0008] When using a busbar to connect modules stacked in an upper and lower direction, it is necessary to insert handles and bolts between the two stacked battery modules to complete the fixation of the busbar and the pole. Therefore, when designing an immersion energy storage cabinet, sufficient space must be reserved between the two stacked battery modules, resulting in low space utilization of the immersion energy storage cabinet.

[0009] Technical Solutions

[0010] The present application provides an immersion energy storage device to achieve stable connection to a battery module and improve space utilization of the immersion energy storage device.

[0011] The present application provides an immersion energy storage device, comprising:

[0012] The cabinet has a receiving cavity configured to receive insulating coolant;

[0013] At least two battery modules stacked along a first direction are immersed in the insulating coolant, the output ends of the battery modules extend out of the outer end surfaces of the battery modules along a second direction, and the output ends of the battery modules have first abutting surfaces; and

[0014] The connector is a rigid structure comprising a connecting body, a bending structure, and an insulating structure. The connecting body is provided with a bending structure at both ends thereof, the bending structure having a second butt joint surface, and the insulating structure wraps around the portion of the bending structure other than the second butt joint surface.

[0015] The bending structure is fixed to the output end of the battery module by threads, and the first docking surface is in contact with the second docking surface.

[0016] Beneficial effects

[0017] The immersion energy storage device provided in the present application can achieve effective heat dissipation of the battery module by providing a accommodating cavity in the cabinet to accommodate insulating coolant and immersing the battery module in the insulating coolant. By extending the output end of the battery module out of the outer end face of the battery module in the second direction and providing a connector consisting of a connecting body and a bending structure provided at opposite ends of the connecting body, the output end of the battery module is respectively fixed by threads using the two bending structures in the connector, so that the first docking surface on the output end of the battery module abuts against the second docking surface on the bending structure, thereby achieving series or parallel connection of the battery modules. Moreover, after the rigid structure connector is threadedly fixed to the battery module, it will not shake due to the circulating insulating coolant. It can not only ensure the connection stability between the connector and the battery module and the normal operation of the battery module, but also has a simple structure and is easy to disassemble and assemble. By wrapping the insulating structure on the outside of the bending structure, the safety of disassembly and assembly between the battery module and the connector can be ensured. In addition, since the output end of the battery module is connected and fixed to the connecting piece from one end of the battery module along the second direction, an angle is ensured between the first direction and the second direction, and the gap between the battery modules along the first direction can be effectively reduced, thereby improving the energy density and space utilization of the storage cavity in the cabinet.

[0018] BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic structural diagram of an immersion energy storage device provided by some implementations of the present application;

[0020] FIG2 is a simplified structural diagram of an immersion energy storage device provided by some implementations of the present application;

[0021] FIG3 is an exploded schematic diagram of a battery module and a connector provided in some implementations of the present application;

[0022] FIG4 is a schematic structural diagram of a bending structure and a connecting body provided by some implementations of the present application;

[0023] FIG5 is a partial enlarged schematic diagram of point A in FIG3;

[0024] FIG6 is one of the structural schematic diagrams of the connector provided in some implementations of the present application;

[0025] FIG7 is a second structural diagram of a connector provided in some implementations of the present application;

[0026] FIG8 is a schematic cross-sectional view of a second bending portion and an insulating structure provided in some implementations of the present application.

[0027] In the picture:

[0028] 100, connector; 110, bending structure; 111, first bending portion; 112, second bending portion; 1121, second mating surface; 1122, first threaded through hole; 120, connecting body; 130, insulating structure; 131, mounting seat; 1311, first accommodating through hole; 1312, rib; 140, fixing bolt;

[0029] 200, battery module; 210, busbar; 211, third bend; 212, fourth bend; 2121, first mating surface; 2122, second threaded through hole; 220, battery cell; 230, positioning member; 231, first receiving groove; 232, second receiving groove; 2321, first threaded blind hole; 240, adapter;

[0030] 300. Cabinet; 310. Accommodation cavity.

[0031] Modes for Carrying Out the Invention

[0032] As shown in FIG. 1 to FIG. 7 , this embodiment provides an immersion energy storage cabinet. The submerged energy storage cabinet includes a cabinet 300, at least two battery modules 200 stacked along a first direction, and a connector 100, wherein the cabinet 300 has a receiving cavity 310 configured to hold an insulating coolant, and the at least two battery modules 200 stacked along the first direction are both immersed in the insulating coolant. The output end of the battery module 200 extends out of the outer end surface of the battery module 200 along the second direction, and the output end of the battery module 200 has a first docking surface 2121. The connector 100 is a rigid structure and includes a connecting body 120, a bending structure 110, and an insulating structure 130. The two opposite ends of the connecting body 120 are both provided with a bending structure 110, and the bending structure 110 has a second docking surface 1121. The insulating structure 130 is wrapped around the portion of the bending structure 110 except the second docking surface 1121. The bending structure 110 is threadedly fixed to the output end of the battery module 200, and the first docking surface 2121 abuts against the second docking surface 1121.

[0033] The immersion energy storage device is capable of achieving effective heat dissipation of the battery module 200 by providing a receiving cavity 310 in the cabinet 300 to accommodate the insulating coolant and immersing the battery module 200 in the insulating coolant. The output end of the battery module 200 is extended out of the outer end face of the battery module 200 in the second direction, and a connector 100 is provided which is composed of a connecting body 120 and a bending structure 110 provided at opposite ends of the connecting body 120. The output end of the battery module 200 is respectively screwed and fixed by the two bending structures 110 in the connecting body 100, so that the first pair of the output end of the battery module 200 is fixed. The interface 2121 abuts against the second interface 1121 on the bending structure 110, enabling the series or parallel connection of the battery modules 200. Furthermore, after being threadedly secured to the battery module 200, the rigid connector 100 will not wobble due to the circulating insulating coolant. This not only ensures the stability of the connection between the connector 100 and the battery module 200 and the normal operation of the battery module 200, but also offers a simple structure and convenient assembly and disassembly. By wrapping the insulating structure 130 around the exterior of the bending structure 110, the safety of assembly and disassembly between the battery module 200 and the connector 100 is ensured. Furthermore, because the output end of the battery module 200 is connected and secured to the connector 100 from one end of the battery module 200 along the second direction, an angle is maintained between the first and second directions. This effectively reduces the gap between the battery modules 200 along the first direction, thereby improving the energy density and space utilization of the storage cavity 310 within the cabinet 300. In this embodiment, the connecting body 120 and the bending structure 110 in the connector 100 are both made of copper, which not only has good electrical conductivity but is also easy to bend. In other embodiments, the connecting body 120 and the bending structure 110 can also be made of other metal materials.

[0034] In this embodiment, the first direction is the vertical direction, the second direction is the front-to-back direction in the horizontal plane, and the angle between the first and second directions is a right angle. This allows the battery modules 200 in the immersion energy storage device to be stacked vertically, with the output ends of the battery modules 200 extending from the outer end surfaces of the battery modules 200 in the front-to-back direction. The bent structure 110 in the connector 100 is threadedly secured to the output ends of the battery modules 200 in the front-to-back direction. In other embodiments, the specific orientations of the first and second directions can be adjusted according to actual needs, as long as the angle between the first and second directions is maintained.

[0035] In an optional embodiment, as shown in Figures 1 and 2, the output ends of two adjacent battery modules 200 face each other in a first direction, and the two bent structures 110 within the connector 100 are respectively connected and fixed to the output ends of the two adjacent battery modules 200. According to the resistance calculation formula, Joule's law, and the law of conservation of energy, it can be seen that the longer the connector 100 is, the more heat energy it generates and the more electrical energy is wasted. By ensuring that the output ends of two adjacent battery modules 200 face each other in the first direction, the size of the connector 100 can be shortened, minimizing its length. This not only saves costs and improves the energy utilization rate of the immersion energy storage device, but also makes the internal structure of the immersion energy storage device more simple and beautiful.

[0036] In this embodiment, the submerged energy storage device includes eight battery modules 200 stacked along a first direction. The positive and negative output terminals of two adjacent battery modules 200 face each other along the first direction. Connectors 100 are configured to connect the positive and negative output terminals of two adjacent battery modules 200, thereby connecting the eight battery modules 200 in series. In other embodiments, the specific number of battery modules 200 can be adjusted based on actual needs.

[0037] As shown in Figure 4, the bending structure 110 includes a first bending portion 111 and a second bending portion 112, wherein the first bending portion 111 is connected to the connecting body 120, and the extension direction of the first bending portion 111 is perpendicular to the extension direction of the connecting body 120, and the second bending portion 112 is connected to the end of the first bending portion 111 away from the connecting body 120, and the extension direction of the second bending portion 112 is parallel to the extension direction of the connecting body 120, and the second bending portion 112 has a second docking surface 1121. By connecting the two opposite ends of the first bending portion 111 to the second bending portion 112 and the connecting body 120 respectively, the extension direction of the first bending portion 111 is parallel to the extension direction of the connecting body 120, and the extension direction of the second bending portion 112 is perpendicular to the extension direction of the connecting body 120, so that a distance can be created between the second docking surface 1121 on the second bending portion 112 and the end face of the connecting body 120, thereby facilitating the abutment between the second docking surface 1121 and the first docking surface 2121 on the output end of the battery module 200.

[0038] The structure of the battery module 200 is described in conjunction with Figures 3 and 5. The battery module 200 includes at least two battery cells 220 and a busbar 210, wherein the busbar 210 is configured to connect the battery cells 220 in series or in parallel. The output end of the busbar 210 is provided with a third bend portion 211 and a fourth bend portion 212. The third bend portion 211 extends along the second direction and extends out of the outer end surface of the battery module 200. The fourth bend portion 212 is connected to the end of the third bend portion 211 away from the busbar 210. The fourth bend portion 212 extends along the first direction and has a first abutting surface 2121. At least two battery cells 220 are connected in series or in parallel using a busbar 210, and a third bend 211 and a fourth bend 212 are provided at the output end of the busbar 210. The third bend 211 extends in the second direction and extends beyond the outer end surface of the battery module 200. The fourth bend 212 is connected to the end of the third bend 211 away from the busbar 210. The fourth bend 212 extends in the first direction, and a first mating surface 2121 is provided on the fourth bend 212. This achieves a connection and fixation effect between the first mating surface 2121 and the second mating surface 1121 on the second bend 112 at the side end of the battery module 200. In this embodiment, the fourth bend 212 extends downward in the first direction.

[0039] The battery module 200 also includes a positioning member 230, wherein the positioning member 230 is arranged on the outer end surface of at least two battery cells 220, and a first accommodating groove 231 and a second accommodating groove 232 that are conductive to each other are provided on the positioning member 230, the first accommodating groove 231 extends along the second direction, and the second accommodating groove 232 is arranged at an end of the first accommodating groove 231 away from the battery cell 220, the first accommodating groove 231 is configured to accommodate the third bending portion 211, the second accommodating groove 232 extends along the first direction, and the second accommodating groove 232 is configured to accommodate the fourth bending portion 212. By arranging a first accommodating groove 231 extending along the second direction and a second accommodating groove 232 extending along the first direction in the positioning member 230, the second accommodating groove 232 is arranged at an end of the first accommodating groove 231 away from the battery cell 220 and is connected to the first accommodating groove 231, so that the first accommodating groove 231 accommodates the third bending portion 211, and the second accommodating groove 232 accommodates the fourth bending portion 212, the third bending portion 211 and the fourth bending portion 212 can be positioned and fixed, which not only facilitates the subsequent abutment between the first docking surface 2121 and the second docking surface 1121, but also can isolate the third bending portion 211 and the fourth bending portion 212 from the battery cell 220, avoiding direct contact between the third bending portion 211 and the fourth bending portion 212 and the battery cell 220 shell, thereby improving the protection of the battery cell 220. In this embodiment, the first direction is the vertical direction, the second direction is the front-to-back direction, and the fourth bent portion 212 extends downward in the vertical direction. Therefore, the positioning member 230 is disposed below the third bent portion 211 and the fourth bent portion 212, and the second receiving groove 232 extends downward in the vertical direction from the end that is in communication with the first receiving groove 231. In other embodiments, the fourth bent portion 212 may also extend upward in the vertical direction. In this case, the positioning member 230 only needs to be disposed above the third bent portion 211 and the fourth bent portion 212, and the second receiving groove 232 extends upward in the vertical direction from the end that is in communication with the first receiving groove 231.

[0040] In this embodiment, the positioning member 230 is made of PA66 (polyamide, commonly known as nylon 66), with a dielectric strength of 60 kV / mm (kilovolts per millimeter) to ensure insulation between the third and fourth bends 211, 212, and the outer shell of the battery cell 220. In other embodiments, the positioning member 230 may also be made of other insulating materials.

[0041] In this embodiment, as shown in FIG3 , each battery module 200 includes 30 battery cells 220 . The 30 battery cells 220 are divided into two groups. The battery cells 220 in each group are stacked horizontally along the thickness direction of the battery cells 220 , and the two groups of battery cells 220 are arranged along the length direction of the battery cells 220 . To achieve the series connection of the two groups of battery cells 220 , the battery module 200 further includes an adapter 240 . The battery module 200 includes two busbars 210 , each busbar 210 corresponding to a group of battery cells 220 . The first end of the adapter 240 is connected to the negative output terminal of either of the two busbars 210 , and the second end of the adapter 240 is connected to the positive output terminal of the other of the two busbars 210 , thereby achieving the series connection of the two groups of battery cells 220 .

[0042] The adapter 240 is also provided with a structure similar to the bending structure 110 on the connector 100 , so as to realize the series connection of the two groups of battery cells 220 from the side of the battery module 200 .

[0043] In some implementations, as shown in Figures 4 and 5, a first threaded through hole 1122 is defined in the second bend portion 112, and a second threaded through hole 2122 is defined in the fourth bend portion 212. The first threaded through hole 1122 and the second threaded through hole 2122 are coaxially connected. The submerged energy storage device further includes a fixing bolt 140, which is sequentially threaded through the first threaded through hole 1122 and the second threaded through hole 2122. By defining the first threaded through hole 1122 in the second bend portion 112 and the second threaded through hole 2122 in the fourth bend portion 212, the first threaded through hole 1122 and the second threaded through hole 2122 are ensured to be coaxially connected, and the bolts are sequentially threadedly fixed to the first threaded through hole 1122 and the second threaded through hole 2122, thereby achieving abutment between the first and second abutting surfaces 2121 and the second bend portion 1121, and threaded fixation between the second bend portion 112 and the fourth bend portion 212.

[0044] In some implementations, at least two first threaded through holes 1122 are provided at intervals on the second bent portion 112, and at least two second threaded through holes 2122 are provided at intervals on the fourth bent portion 212. Each first threaded through hole 1122 corresponds to a second threaded through hole 2122 and a fixing bolt 140. By providing at least two first threaded through holes 1122 at intervals on the second bent portion 112 and at least two second threaded through holes 2122 at intervals on the fourth bent portion 212, and by ensuring that each first threaded through hole 1122 corresponds to a second threaded through hole 2122 and a fixing bolt 140, the at least two fixing bolts 140 can simultaneously connect and fix the second bent portion 112 and the fourth bent portion 212, thereby improving the fixing effect of the second bent portion 112 and the fourth bent portion 212. In this embodiment, two first threaded through holes 1122 are provided at intervals on the second bent portion 112, and two second threaded through holes 2122 are provided at intervals on the fourth bent portion 212. Each first threaded through hole 1122 corresponds to one second threaded through hole 2122 and one fixing bolt 140. In other embodiments, the specific number of the first threaded through holes 1122 and the second threaded through holes 2122 can be adjusted according to actual needs.

[0045] A first threaded blind hole 2321 is provided on the groove wall of the second accommodating groove 232 in the positioning member 230, which is opposite to the fourth bending portion 212. The first threaded blind hole 2321 is coaxially connected with the first threaded through hole 1122 and the second threaded through hole 2122. The fixing bolt 140 is threadedly passed through the first threaded through hole 1122 and the second threaded through hole 2122 in sequence and then threadedly fixed with the first threaded blind hole 2321, so as to ensure the fixing effect of the second bending portion 112 and the fourth bending portion 212 while ensuring the positioning effect of the positioning member 230 on the fourth bending portion 212. In other embodiments, if a first threaded blind hole 2321 is provided on the positioning member 230, the first threaded through hole 1122 and the second threaded through hole 2122 may also not be provided with internal threads. In this case, the fixing bolt 140 only passes through the first threaded through hole 1122 and the second threaded through hole 2122, and the second bending portion 112 and the fourth bending portion 212 are clamped and fixed by the threaded fixation of the fixing bolt 140 and the first threaded blind hole 2321.

[0046] As shown in Figures 6 to 8, a mounting seat 131 is provided on the insulating structure 130, and the mounting seat 131 protrudes along the axial direction of the first threaded through hole 1122 in a direction away from the first threaded through hole 1122. A first accommodating through hole 1311 is provided in the mounting seat 131, and the first accommodating through hole 1311 is coaxially connected to the first threaded through hole 1122. The first accommodating through hole 1311 is configured to accommodate the head of the fixing bolt 140. By providing a mounting base 131 on the insulating structure 130, and providing a first accommodating through hole 1311 on the mounting base 131 that is coaxially connected to the first threaded through hole 1122, and utilizing the first accommodating through hole 1311 to accommodate the head of the fixing bolt 140, not only can the protection of the fixing bolt 140 be improved, but also when the fixing bolt 140 is used to connect and fix the second bending portion 112 and the fourth bending portion 212, the first accommodating through hole 1311 can also provide a guide for the docking of the fixing bolt 140 and the first threaded through hole 1122.

[0047] At least two ribs 1312 are circumferentially spaced apart on the outer wall of the mounting base 131. The provision of at least two ribs 1312 circumferentially spaced apart on the outer wall of the mounting base 131 improves the structural strength of the mounting base 131, thereby enhancing the connection strength between the connector 100 and the battery module 200. In this embodiment, three ribs 1312 are circumferentially spaced apart on the outer wall of the mounting base 131. In other embodiments, the specific number of ribs 1312 can be adjusted according to actual needs.

[0048] In this embodiment, two first threaded through holes 1122 are provided on the second bent portion 112, and two mounting seats 131 are provided on the insulating structure 130. Each mounting seat 131 is provided with a first accommodating through hole 1311, and each first accommodating through hole 1311 is coaxially connected to the corresponding first threaded through hole 1122. In other embodiments, the specific number of mounting seats 131 can be adjusted based on the specific number of first threaded through holes 1122, as long as each first threaded through hole 1122 is provided in a corresponding first accommodating through hole 1311 in the mounting seat 131.

[0049] In some implementations, the insulating structure 130 is injection molded, and the insulating structure 130 and the bending structure 110 are detachably fixed. By using injection molding to process the insulating structure 130, the processing accuracy and efficiency of the insulating structure 130 can be improved, ensuring the specification consistency of the insulating structure 130. By making the insulating structure 130 and the bending structure 110 detachable and fixed, the insulating structure 130 can be easily replaced, facilitating subsequent maintenance and replacement of the insulating structure 130. In other embodiments, the insulating structure 130 can also be formed using other processing methods.

[0050] Insulation structure 130 in this embodiment is made of PA66 (polyamide, commonly known as nylon 66). By injection molding insulation structure 130, dielectric strength of insulation structure 130 can reach 60 kV / mm, effectively ensuring the safe use of insulation structure 130. In other embodiments, insulation structure 130 may also be made of other insulating materials.

[0051] In this embodiment, the immersion energy storage device also includes a circulating cooling component, wherein the circulating cooling component includes a circulating cooling element and two connecting pipes. The cabinet 300 is provided with a liquid inlet and a liquid outlet that are connected to the accommodating cavity 310. Any one of the two connecting pipes is configured to connect the output end of the circulating cooling element with the liquid inlet on the cabinet 300, and the other of the two connecting pipes is configured to connect the input end of the circulating cooling element with the liquid outlet on the cabinet 300, so that the insulating coolant that has completed cooling in the circulating cooling element flows out from the output end and flows into the accommodating cavity 310 of the cabinet 300 along the connecting pipe and the liquid inlet, and the insulating coolant that has absorbed heat in the accommodating cavity 310 of the cabinet 300 flows out from the liquid outlet and flows into the insulating coolant along the connecting pipe and the input end of the insulating cooling element, thereby realizing the circulation of the insulating coolant between the accommodating cavity 310 of the cabinet 300 and the circulating cooling element.

Claims

1. An immersion energy storage device, comprising: The cabinet (300) has a receiving cavity (310) configured to receive insulating coolant; At least two battery modules (200) stacked along a first direction are immersed in the insulating coolant, the output end of the battery module (200) extends out of the outer end surface of the battery module (200) along a second direction, and the output end of the battery module (200) has a first docking surface (2121); as well as A connecting member (100), the connecting member (100) being a rigid structure, comprising a connecting body (120), a bending structure (110), and an insulating structure (130), the bending structures (110) being provided at opposite ends of the connecting body (120), the bending structure (110) having a second docking surface (1121), and the insulating structure (130) wrapping around a portion of the bending structure (110) other than the second docking surface (1121); The bending structure (110) is threadedly fixed to the output end of the battery module (200), the first docking surface (2121) and the second docking surface (1121) are in contact with each other, and an angle exists between the first direction and the second direction.

2. The submerged energy storage device according to claim 1, wherein: The bending structure (110) comprises: A first bending portion (111) is connected to the connecting body (120), and an extending direction of the first bending portion (111) is perpendicular to an extending direction of the connecting body (120); and The second bending portion (112) is connected to an end of the first bending portion (111) away from the connecting body (120), the extension direction of the second bending portion (112) is parallel to the extension direction of the connecting body (120), and the second bending portion (112) has a second docking surface (1121).

3. The submerged energy storage device according to claim 1, wherein: The battery module (200) comprises: at least two battery cells (220); and A busbar (210), wherein the busbar (210) is configured to connect the battery cells (220) in series or in parallel, and an output end of the busbar (210) is provided with a third bend portion (211) and a fourth bend portion (212), wherein the third bend portion (211) extends along the second direction and extends out of the outer end face of the battery module (200), and the fourth bend portion (212) is connected to an end of the third bend portion (211) away from the busbar (210), and the fourth bend portion (212) extends along the first direction, and the fourth bend portion (212) has the first docking surface (2121).

4. The submerged energy storage device according to claim 3, wherein: The battery module (200) further includes: A positioning member (230) is provided on the outer end surfaces of at least two of the battery cells (220), and a first accommodating groove (231) and a second accommodating groove (232) that are in conductive communication with each other are provided on the positioning member (230); The first accommodating groove (231) extends along the second direction, and the first accommodating groove (231) is configured to accommodate the third bent portion (211). The second accommodating groove (232) is arranged at an end of the first accommodating groove (231) away from the battery cell (220), and the second accommodating groove (232) extends along the first direction, and the second accommodating groove (232) is configured to accommodate the fourth bent portion (212).

5. The submerged energy storage device according to claim 1, wherein: A first threaded through hole (1122) is provided on the bending structure (110), a second threaded through hole (2122) is provided on the output end of the battery module (200), and the first threaded through hole (1122) and the second threaded through hole (2122) are coaxially connected; The submerged energy storage device further comprises a fixing bolt (140), wherein the fixing bolt (140) is threadedly passed through the first threaded through hole (1122) and the second threaded through hole (2122) in sequence.

6. The submerged energy storage device according to claim 5, wherein: A mounting seat (131) is provided on the insulating structure (130), and the mounting seat (131) protrudes in an axial direction of the first threaded through hole (1122) in a direction away from the first threaded through hole (1122). A first accommodating through hole (1311) is provided in the mounting seat (131), and the first accommodating through hole (1311) is coaxially connected to the first threaded through hole (1122). The first accommodating through hole (1311) is configured to accommodate the head of the fixing bolt (140).

7. The submerged energy storage device according to claim 6, wherein: At least two ribs (1312) are provided at intervals in the circumferential direction on the outer peripheral wall of the mounting seat (131).

8. The submerged energy storage device according to claim 5, wherein: At least two of the first threaded through holes (1122) are spaced apart on the bending structure (110), and at least two of the second threaded through holes (2122) are spaced apart on the output end of the battery module (200), and each of the first threaded through holes (1122) is correspondingly arranged with one of the second threaded through holes (2122) and one of the fixing bolts (140).

9. The submerged energy storage device according to claim 1, wherein: The output ends of two adjacent battery modules (200) face each other along a first direction, and the two bending structures (110) in the connecting member (100) are respectively connected and fixed to the output ends of the two adjacent battery modules (200).

10. The submerged energy storage device according to claim 1, wherein: The insulating structure (130) is injection-molded, and the insulating structure (130) and the bending structure (110) are detachably fixed.

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