Energy storage device and energy storage system

Abstract

The utility model relates to an energy storage device and an energy storage system.The energy storage device comprises a shell, a battery module and a control module, the shell is suitable for forming a first containing cavity and a second containing cavity, the battery module is suitable for being arranged in the first containing cavity, and at least part of the battery module makes contact with a cooling medium; the control module is suitable for being arranged in the second containing cavity, and the control module is electrically connected with the battery module. Therefore, at least part of the battery modules in the first accommodating cavity are in direct contact with the cooling medium, so that all-directional cooling can be realized, the heat dissipation effect is ensured, and the heat dissipation efficiency is improved. And the cooling liquid can prevent the battery pack from firing, and the safety performance is high. The energy storage device is flexible in module assembly and high in adaptability, adopts small-unit independent modules, is flexible in assembly, and meets different requirements of industry and commerce for electric quantity; the control module is integrated in the energy storage device, unitization and modularization of the energy storage system are achieved, and convenience and economical efficiency of the battery energy storage system are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of energy storage, and particularly to an energy storage device and an energy storage system. Background Art

[0002] With the rapid development of technology, as a practical energy storage device, the energy storage battery cabinet has been widely used in various industries.

[0003] In related technologies, for most energy storage battery cabinets, the battery module and the control module are respectively and independently arranged in several separate cabinets, and then multiple cabinets are stacked, which has problems of low integration degree and large occupied space. Summary of the Utility Model

[0004] The purpose of the present disclosure is to provide an energy storage device and an energy storage system to at least partially solve the problems existing in related technologies.

[0005] To achieve the above purpose, the present disclosure provides an energy storage device, including:

[0006] A housing, the housing being adapted to form a first accommodation cavity and a second accommodation cavity,

[0007] A battery module, the battery module being adapted to be arranged in the first accommodation cavity, and at least part of the battery module being in contact with a cooling medium, and

[0008] A control module, the control module being adapted to be arranged in the second accommodation cavity, and the control module being electrically connected to the battery module.

[0009] Optionally, the control module is located above the battery module.

[0010] Optionally, at least part of the battery module is immersed in the cooling medium.

[0011] Optionally, the energy storage device further includes:

[0012] A base module, the base module including a tray, the battery module being installed on the tray, and liquid inlet holes and liquid outlet holes being formed in the tray.

[0013] Optionally, the housing includes:

[0014] A top plate, the top plate being located at the top of the first accommodation cavity, a spraying assembly being installed on the top plate, and the spraying assembly being connected to the liquid inlet hole through a pipeline.

[0015] Optionally, the battery module includes:

[0016] A plurality of battery cell assemblies, with gaps between adjacent battery cell assemblies. One end of the plurality of battery cell assemblies in the width direction is provided with a perforated plate. There is a liquid storage cavity between the perforated plate and the housing. The liquid inlet hole communicates with the liquid storage cavity. Through holes are provided at positions on the perforated plate corresponding to the gaps.

[0017] Optionally, a flow channel part covering the liquid inlet hole is installed on the tray. The flow channel part is configured as a hollow structure, and a liquid flow hole communicating with the liquid storage cavity is provided at the top end of the flow channel part.

[0018] Optionally, the battery module includes at least one battery cell assembly. The battery cell assembly includes a plurality of battery cells arranged side by side in a stacked manner, a front end plate and a rear end plate installed at opposite ends of the battery cell assembly in the width direction, and a tension plate connected between the front end plate and the rear end plate. The tension plate is installed at the top end and / or the bottom end of the battery cell assembly.

[0019] Optionally, the battery module includes a plurality of the battery cell assemblies, and the plurality of battery cell assemblies are stacked in the height direction.

[0020] Optionally, the battery module further includes a support frame, and the support frame is detachably connected to the front end plate, the rear end plate, and the housing respectively.

[0021] Optionally, the battery module further includes a cushion block, and the cushion block is installed at the bottom end of the lowermost battery cell assembly.

[0022] Optionally, the cushion block includes at least one convex block and at least one concave block, the convex blocks and the concave blocks are arranged alternately side by side in the height direction, and the width of the convex block is greater than the width of the concave block.

[0023] Optionally, the housing is configured as a multi-layer structure. The multi-layer structure includes a first layer and a second layer arranged in sequence along the wall thickness direction of the housing. The materials of both the first layer and the second layer are fiberglass. There is a cavity between the first layer and the second layer, and the cavity is filled with gas.

[0024] Optionally, the housing includes a first housing forming the first accommodation cavity and a second housing forming the second accommodation cavity.

[0025] Optionally, the second housing includes a cabinet body and a cover plate assembly. The top end of the cabinet body is open, and the cover plate assembly is connected to the cabinet body in an openable and closable manner.

[0026] Optionally, a reinforcing ring is provided at the top end and / or the bottom end of the housing.

[0027] Optionally, the control module includes at least one of a BMS, a PCS, a power distribution module, and a busbar module.

[0028] According to a second aspect of the present disclosure, there is also provided an energy storage system, which includes at least one energy storage device, and the energy storage device is the above-mentioned energy storage device.

[0029] Through the above technical solutions, at least part of the battery modules in the first accommodation cavity are in direct contact with the cooling medium, which can cool down in all directions, ensure the heat dissipation effect, and improve the heat dissipation efficiency. Moreover, the coolant can prevent the battery pack from catching fire, and has high safety performance. The coolant circulation system is only used for the battery modules, which can minimize the number of outgoing lines and effectively ensure its sealing performance. The energy storage device module is flexible in configuration and strong in adaptability. It adopts small-unit independent modules, which are flexible in configuration and can meet the different electricity demands of industrial and commercial enterprises; integrating the control module into the energy storage device realizes the unitization and modularization of the energy storage system, and improves the convenience and economy of the battery energy storage system.

[0030] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. They are used together with the following specific implementation to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0032] Figure 1 is a schematic structural diagram of an energy storage device provided by an exemplary embodiment of the present disclosure;

[0033] Figure 2 is a schematic structural diagram of the energy storage device provided by an exemplary embodiment of the present disclosure after removing the first housing;

[0034] Figure 3 is a schematic structural diagram of the energy storage device provided by an exemplary embodiment of the present disclosure after removing the control module;

[0035] Figure 4 is a schematic structural diagram of the energy storage device provided by an exemplary embodiment of the present disclosure after removing the control module from another angle;

[0036] Figure 5 is a schematic diagram of the coolant circulation flow of the energy storage device provided by an exemplary embodiment of the present disclosure;

[0037] Figure 6 is a schematic structural diagram of the battery cell assembly in the energy storage device provided by an exemplary embodiment of the present disclosure;

[0038] Figure 7It is a schematic structural diagram of a support frame in an energy storage device provided by an exemplary embodiment of the present disclosure;

[0039] Figure 8 It is a schematic structural diagram of a cushion block in an energy storage device provided by an exemplary embodiment of the present disclosure;

[0040] Figure 9 It is a schematic structural diagram of a first housing in an energy storage device provided by an exemplary embodiment of the present disclosure;

[0041] Figure 10 It is a schematic structural diagram of a control module in an energy storage device provided by an exemplary embodiment of the present disclosure;

[0042] Figure 11 It is a schematic structural diagram of a cover plate assembly in an energy storage device provided by an exemplary embodiment of the present disclosure;

[0043] Figure 12 It is a schematic structural diagram of a cabinet body in an energy storage device provided by an exemplary embodiment of the present disclosure;

[0044] Figure 13 It is a schematic structural diagram of the cabinet body in an energy storage device provided by an exemplary embodiment of the present disclosure from another angle;

[0045] Figure 14 It is a schematic structural diagram of a base module in an energy storage device provided by an exemplary embodiment of the present disclosure with the drainage plate removed;

[0046] Figure 15 It is a schematic structural diagram of a base module in an energy storage device provided by an exemplary embodiment of the present disclosure;

[0047] Figure 16 It is a schematic structural diagram of another angle of the base module in an energy storage device provided by an exemplary embodiment of the present disclosure.

[0048] Description of Reference Numerals

[0049] 10 - Housing; 101 - Top plate; 102 - First housing; 103 - Second housing; 1 - Battery module; 111 - Reinforcing ring; 112 - Observation window; 12 - Battery cell assembly; 121 - Front end plate; 1211 - Connecting block; 122 - Rear end plate; 123 - Pulling plate; 124 - Battery cell; 125 - Positioning pin; 13 - Support frame; 131 - Vertical rod; 132 - Cross beam; 133 - Reinforcing beam; 14 - Spacer; 141 - Protrusion; 142 - Concave block; 15 - Perforated plate; 151 - Through hole; 16 - Flow channel part; 161 - Liquid flow hole; 2 - Control module; 211 - Cabinet; 2111 - Wire passing opening; 212 - Cover assembly; 2121 - Main body part; 2122 - Cover body part; 2131 - First air inlet window; 2132 - Second air inlet window; 214 - Exhaust port; 215 - Exhaust part; 216 - Limit boss; 22 - Exhaust pipe; 3 - Base module; 31 - Tray; 311 - Liquid inlet hole; 3111 - Liquid inlet pipe; 312 - Liquid outlet hole; 313 - Connecting column; 314 - Positioning column; 32 - Bracket; 321 - Support beam; 322 - Column; 323 - Drainage plate; 3231 - Liquid drainage hole Detailed implementation manners

[0050] The following provides a detailed description of the specific implementation manners of the present disclosure with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only for the purpose of illustrating and explaining the present disclosure, and are not used to limit the present disclosure.

[0051] In the present disclosure, unless otherwise stated, the orientation terms "upper", "lower", "top", and "bottom" are defined based on the actual use directions of the relevant components. The orientation terms "width direction" and "height direction" are based on the drawing directions. Referring to Figure 2 ,"width direction" and "height direction" are only definitions for convenience of description and do not limit the dimensional relationships in each direction. "Inner" and "outer" are defined with respect to the outline of the corresponding components. The purpose of using terms such as "first" and "second" is to distinguish different components, and they do not have sequentiality and importance. In the present disclosure, when the following description involves the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0052] Referring to Figures 1 to 16 ,the present disclosure provides an energy storage device, which may include a housing 10, a battery module 1, and a control module 2. Among them, the housing 10 is adapted to form a first accommodation cavity and a second accommodation cavity; the battery module 1 is adapted to be disposed in the first accommodation cavity, and at least part of the battery module 1 is in contact with a cooling medium; the control module 2 is adapted to be disposed in the second accommodation cavity, and the control module 2 is electrically connected to the battery module 1, realizing the unitization and modularization of the energy storage system.

[0053] In addition, a temperature sensing device may be attached to the battery module 1 to detect the temperatures of several points on the battery cells, so as to monitor the temperature conditions of the battery cells during operation. When the temperature of the battery cells is higher than a certain temperature, the intelligent system will start the chiller device to take away the heat of the battery cells through the circulation of the coolant.

[0054] Through the above technical solution, at least part of the battery modules in the first accommodating cavity are in direct contact with the cooling medium, which can cool down in all directions, ensure the heat dissipation effect and improve the heat dissipation efficiency. Moreover, the coolant can prevent the battery pack from catching fire, and has high safety performance. The coolant circulation system is only used for the battery modules, which can minimize the number of outgoing lines and effectively ensure its sealing performance. The energy storage device module is flexible in configuration and strong in adaptability. It adopts small-unit independent modules, which are flexible in configuration and can meet the different power demands of industrial and commercial enterprises. Integrating the control module into the energy storage device realizes the unitization and modularization of the energy storage system, and improves the convenience and economy of the battery energy storage system.

[0055] In some embodiments, referring to Figure 1 , the control module 2 may be located above the battery module 1, which can prevent the coolant at the battery module 1 from flowing to the control module 2 and is convenient for maintenance. The present disclosure does not limit the relative position between the control module 2 and the battery module 1, and all belong to the protection scope of the present disclosure.

[0056] In an embodiment of the present disclosure, at least part of the battery modules 1 are immersed in the cooling medium. At least part of the battery modules 1 in the first accommodating cavity are immersed in the coolant, and the external chiller device drives the circulation of the immersed coolant, so as to realize the all-round cooling of the battery modules 1, ensure the heat dissipation effect, improve the heat dissipation efficiency and have high safety performance. At the same time, the immersed coolant plays a role in preventing the battery from catching fire.

[0057] As an exemplary embodiment of the present disclosure, referring to Figure 14 、 Figure 16 , the energy storage device may further include a base module 3. The base module 3 includes a tray 31, and the battery module 1 is installed on the tray 31. The tray 31 is provided with a liquid inlet hole 311 and a liquid outlet hole 312. The tray 31 may be made of aluminum alloy, and a plurality of connecting columns 313 and a plurality of positioning columns 314 are installed on its upper end surface. Among them, the connecting columns 313 are used for bolt connection with the cushion block 14, and the positioning columns 314 are used for limiting the cushion block 14. Specifically, a groove may be provided at the bottom end of the cushion block 14 for the positioning column 314 to extend into.

[0058] In an embodiment of the present disclosure, pressure sensors are installed at both the liquid inlet hole 311 and the liquid outlet hole 312 to monitor the pressure of the liquid inlet hole 311 and the liquid outlet hole 312, so as to control the supply of the coolant by the chiller equipment. When the liquid level is higher than the designed water level line by a certain height, the hydraulic pressure increases, and the intelligent system is used to control the increase of the liquid outlet volume until it returns to near the designed water level line; when the liquid level is lower than the designed water level line by a certain height, the hydraulic pressure decreases, and the intelligent system is used to control the decrease of the liquid outlet volume until it returns to near the designed water level line; when thermal runaway occurs, the evaporated gas is discharged through the exhaust pipe 22 mentioned below, and when the liquid level is lower than the designed water level line by a certain height, the hydraulic pressure decreases, and the intelligent system is used to control the decrease of the liquid outlet volume until it returns to near the designed water level line.

[0059] In an embodiment of the present disclosure, the housing 10 may include a top plate 101 located at the top of the first accommodation cavity. A spraying assembly is installed on the top plate 101, and the spraying assembly is connected to the liquid inlet hole 311 through a pipeline. The coolant flows into the pipeline through the liquid inlet hole 311, and then flows into the spraying assembly on the top plate 101 through the pipeline, so as to spray onto the battery module 1, enabling the battery module 1 to contact the cooling medium. Specifically, the pipeline can be selected as a flexible hose.

[0060] In some embodiments, referring to Figure 4 , the battery module 1 may include a plurality of battery cell assemblies 12. There is a gap between adjacent battery cell assemblies 12. A perforated plate 15 is installed at one end of the plurality of battery cell assemblies 12 in the width direction. There is a liquid storage cavity between the perforated plate 15 and the housing 10. The liquid inlet hole 311 communicates with the liquid storage cavity. Through holes 151 are formed at positions on the perforated plate 15 corresponding to the gaps. Specifically, the liquid inlet hole 311 and the liquid outlet hole 312 are respectively located on opposite sides of the tray 31 in the width direction. The coolant enters the liquid storage cavity of the battery module 1 through the liquid inlet hole 311, passes through the through holes 151 on the perforated plate 15, enters the gaps between each layer of battery cell assemblies 12 from the side, flows horizontally to the other side of the battery cell assemblies 12, takes away the heat of the battery cells, and finally flows out through the liquid outlet hole 312. The coolant circulation mode is as Figure 5 shown, Figure 5 and the arrow direction in

[0061] Further, referring to Figure 4, a flow channel part 16 covering the liquid inlet hole 311 can be installed on the tray 31. The flow channel part 16 is configured as a hollow structure, and a liquid flow hole 161 communicating with the liquid storage cavity is opened at the top end of the flow channel part 16. The flow channel part 16 can block the gap between the tray 31 and the lowermost battery cell assembly 12. Since a spacer 14 is installed between the battery cell assembly 12 and the tray 31, there is a gap between the battery cell assembly 12 and the tray 31. If the coolant flows in through the liquid inlet holes 311, the initially flowing coolant may flow through the gap to the other side of the battery cell assembly 12 and cannot pass through the gap between adjacent battery cell assemblies 12. Therefore, the flow channel part 16 is provided. The coolant enters the cavity of the flow channel part 16 from the liquid inlet hole 311, then flows to the liquid storage cavity through the liquid flow hole 161, and then flows to the other end of the battery cell assembly 12 through the gap between adjacent battery cell assemblies 12.

[0062] According to some embodiments, referring to Figure 14 , the base module 3 may further include a bracket 32 installed at the bottom end of the tray 31. The bracket 32 includes a plurality of support beams 321 horizontally connected to the bottom end of the tray 31 and columns 322 vertically connected to the bottom ends of the support beams 321. The bracket 32 can be a steel structure welded square pipe, and the plurality of support beams 321 are arranged vertically and staggered.

[0063] Further, the liquid inlet hole 311 may be connected to a liquid inlet pipe 3111, and the support beam 321 is provided with an installation hole for the liquid inlet pipe 3111 to pass through. The liquid inlet hole 311 and the liquid outlet hole 312 adopt a 90-degree compression sleeve joint. The compression sleeve joint and the liquid inlet pipe 3111 are both made of stainless steel material, which has good stability, is not easy to corrode, has strong rigidity, high durability, and is more suitable for being in an environment full of coolant for a long time than other materials.

[0064] Further, referring to Figure 15 , a drain plate 323 may be installed at the bottom end of the support beam 321. The liquid inlet pipe 3111 is placed between the drain plate 323 and the tray 31, and a plurality of liquid drain holes 3231 are opened on the drain plate 323. The drain plate 323 can protect the liquid inlet pipe 3111 and can drain the leaked water of the liquid inlet pipe 3111 in time.

[0065] In some embodiments, referring to Figure 2 、 Figure 6, the battery module 1 may include at least one battery cell assembly 12. The battery cell assembly 12 may include a plurality of battery cells 124 stacked side by side, a front end plate 121 and a rear end plate 122 mounted at opposite ends of the battery cell assembly 12 in the width direction, and a tension plate 123 connected between the front end plate 121 and the rear end plate 122. The tension plate 123 is mounted at the top and / or bottom of the battery cell assembly 12. Specifically, the tension plate 123 and the front end plate 121, the rear end plate 122 may be fixed by bolts. There may be connecting blocks 1211 connected to the lower edges of the front end plate 121 and the rear end plate 122 for bolt fixation with the tension plate 123. The front end plate 121, the rear end plate 122 and the tension plate 123 enclose the battery cells 124 to form the battery cell assembly 12. Specifically, the number of tension plates 123 of each battery cell assembly 12 may be multiple, and both ends thereof are respectively connected to the front end plate 121 and the rear end plate 122, and the tension plate 123 extends in a direction perpendicular to the connecting plate 121.

[0066] Furthermore, the battery module 1 may include a plurality of battery cell assemblies 12, and the plurality of battery cell assemblies 12 are stacked in the height direction. The present disclosure does not limit the number of battery cell assemblies 12, which can be adjusted according to actual needs.

[0067] In some embodiments, referring to Figure 3 , the battery module 1 may further include a support frame 13, and the support frame 13 is detachably connected to the front end plate 121, the rear end plate 122 and the housing 10 respectively. The support frame 13 is mainly used to connect the housing 10 and the base module 3 to reinforce the overall energy storage device.

[0068] Among them, referring to Figure 7 , the support frame 13 may include a plurality of vertical rods 131 connected to the front end plate 121 and the rear end plate 122 and a cross beam 132 connected to the housing 10. The vertical rods 131 are placed at the front and rear of the battery cell assembly 12, and the cross beam 132 is placed at the top of the battery cell assembly 12. The vertical rods 131 and the front end plate 121 and the rear end plate 122 of each layer of battery cell assembly 12 may be connected by fasteners such as bolts. The top of the vertical rods 131 and the cross beam 132 are respectively detachably connected to the housing 10, such as bolt connection. In the embodiments of the present disclosure, the support frame 13 includes a plurality of vertical rods 131 and a plurality of cross beams 132. A reinforcing beam 133 may be connected between two adjacent vertical rods 131. The cross section of the reinforcing beam 133 may be configured as an L shape to play a reinforcing role, and holes may be opened on its plate surface to avoid blocking the coolant.

[0069] According to an exemplary embodiment of the present disclosure, referring to Figure 3, one of the adjacent battery cell assemblies 12 may be provided with a vertically extending positioning pin 125, and the other is provided with a positioning hole for the positioning pin 125 to extend into. In the implementation of the present disclosure, the positioning pin 125 is installed at the top end of the front end plate 121 and / or the rear end plate 122, and the positioning hole is opened at the bottom end of the adjacent front end plate 121 and / or the rear end plate 122. The cooperation between the positioning pin 125 and the positioning hole is used for the positioning of the stacking of each layer of battery cell assemblies 12.

[0070] Further, the length of the positioning pin 125 is greater than the depth of the positioning hole, so that there is a gap between the adjacent battery cell assemblies 12. The cooperation between the positioning pin 125 and the positioning hole can ensure the interval between the adjacent battery cell assemblies 12, facilitating the coolant to flow through the interval.

[0071] In some embodiments, referring to Figure 2 , the battery module 1 may further include a spacer 14, and the spacer 14 is installed at the bottom end of the lowermost battery cell assembly 12. In the embodiment of the present disclosure, the spacer 14 is a bakelite spacer. Further, the connection block 1211 of the lowermost layer of battery cell assemblies 12 and the spacer 14 may be connected by bolts, and the bottom of the vertical rod 131 may also be connected to the spacer 14 by bolts.

[0072] In some embodiments, referring to Figure 8 , the spacer 14 may include at least one convex block 141 and at least one concave block 142. The convex blocks 141 and the concave blocks 142 are arranged alternately side by side in the height direction, and the width of the convex block 141 is greater than the width of the concave block 142, so that the spacer 14 forms a plurality of concave-shaped grooves. The creepage distance of this bakelite spacer is 275 mm, and the breakdown distance is 120 mm. The creepage distance refers to the distance that the current travels on the surface of the insulator (bakelite). The bakelite spacer has a multi-layer structure, aiming to increase the path length that the current passes through, that is, the thickness of the bakelite spacer can be reduced under the same creepage distance requirement. Specifically, the bakelite spacer may include three convex blocks 141 and three concave blocks 142.

[0073] Specifically, the housing 10 can be configured as a multi-layer structure. The multi-layer structure includes a first layer and a second layer arranged in sequence along the wall thickness direction of the housing 10. The materials of both the first layer and the second layer are fiberglass reinforced plastic. There is a cavity between the first layer and the second layer, and the cavity is filled with gas, which can specifically be air. This design can not only ensure the insulation performance of the housing 10, but also simplify the structure, making it have better electrical isolation performance and heat preservation performance, and being able to reduce the thermal interference of the outside world on the energy storage system. Since the housing 10 uses fiberglass reinforced plastic with good insulation performance, the gap between the battery cell assembly 12 and the housing 10 can be greatly reduced. On the premise of the same energy, the volume of the energy storage device is effectively reduced, improving the overall energy density. At the same time, because the gap is small, the amount of coolant used can be greatly reduced, effectively improving the coolant utilization rate and reducing costs. Specifically, the minimum gap between the support frame 13 and the housing 10 is about 6.5 mm, and the minimum gap between the battery cell assembly 12 and the housing 10 is about 20 mm. In other embodiments, the housing 10 can also be made of materials such as acrylic and plastic.

[0074] As an exemplary embodiment of the present disclosure, referring to Figure 9 , Figure 10 , the housing 10 can include a first housing 102 forming a first accommodation cavity and a second housing 103 forming a second accommodation cavity. Specifically, the top plate 101 can be formed at the bottom end of the second housing 103. The first housing 102 can be pressed between the second housing 103 and the tray 31. The second housing 103 and the tray 31 rely on the overall force of bolt tightening to clamp the first housing 102. While ensuring the stability, firmness and sealing of the energy storage device, it can effectively prevent the side wall of the battery cell assembly 12 from colliding with the first housing 102 and avoid damage.

[0075] As an exemplary embodiment of the present disclosure, referring to Figure 10 , the second housing 103 can include a cabinet body 211 and a cover plate assembly 212. The top end of the cabinet body 211 is open, and the cover plate assembly 212 is operably connected to the cabinet body 211. When internal equipment needs to be installed, repaired or disassembled, the operator can open the cover plate assembly 212 to perform operations. Among them, the cabinet body 211 is a box-like structure without a cover. The bottom plate of the cabinet body 211 is used to connect to the battery module 1, and the bottom plate of the cabinet body 211 is provided with a wire passing opening 2111 for the battery cable to pass through. In the embodiment of the present disclosure, the bottom plate of the cabinet body 211 is the top plate 101.

[0076] Further, the cover plate assembly 212 may include a main body portion 2121 and a cover body portion 2122. The main body portion 2121 is connected to the edge of the top of the cabinet body 211, and the main body portion 2121 has an opening communicating with the top opening of the cabinet body 211. The cover body portion 2122 is pivotally connected to the main body portion 2121 so as to be able to open or cover the opening. Specifically, the cabinet body 211 and the main body portion 2121 may be hermetically connected by waterproof glue. By pasting a layer of waterproof rubber ring inside the joint of the two and pasting a layer of waterproof rubber ring outside the joint of the two, double protection is carried out to ensure its sealing performance. The cover body portion 2122 may be connected to the main body portion 2121 by a hinge.

[0077] Further, the top surface of the cover body portion 2122 may be inclined downward. Specifically, the inclination angle of the top surface of the cover body portion 2122 is about 2% - 5%, and it may be 3%. When it rains, the rainwater on the cover body portion 2122 can drain along the inclined surface.

[0078] In some embodiments, referring to Figure 11 , Figure 12 , a first air inlet window 2131 is provided on the cabinet body 211, a fan is provided at a position corresponding to the first air inlet window 2131 inside the cabinet body 211, and an air outlet 214 is provided on the main body portion 2121. The first air inlet window 2131 is in an openable form, which is convenient for operators to operate; in addition, a second air inlet window 2132 may also be provided on the cabinet body 211. In the embodiments of the present disclosure, a BMS (Battery Management System) may be installed at a position corresponding to the first air inlet window 2131 inside the cabinet body 211, and a PCS (propulsion control system) may be installed at a position corresponding to the second air inlet window 2132 inside the cabinet body 211. The BMS and PCS can rely on their own built-in cooling fans for heat dissipation. The cold air is sucked in from the first air inlet window 2131 and the second air inlet window 2132 through the fans, and the heat is taken away by the equipment itself, and finally the hot air is discharged from the air outlet 214. Compared with using other heat dissipation systems, selecting the BMS and PCS with built-in cooling fans can reduce energy consumption, simplify the product structure, and improve the integration degree of the energy storage unit. Specifically, the first air inlet window 2131 and the second air inlet window 2132 may be configured as louver structures.

[0079] Further, referring to Figure 11 , an exhaust portion 215 is installed on the top of the main body portion 2121. The exhaust portion 215 communicates with the second accommodation cavity, and the air outlet 214 is formed on the side wall of the exhaust portion 215. The air outlet 214 is a heat dissipation port for the internal equipment of the control module 2. Considering rain protection outdoors, in the way of laterally opening on the protruding exhaust portion 215, a louver is installed on the air outlet 214, which can discharge the hot air in the internal equipment area while preventing rainwater from entering the cabinet.

[0080] Further, referring to Figure 13 , an exhaust pipe 22 is provided in the second housing 103. One end of the exhaust pipe 22 extends into the first accommodation cavity, and the other end extends out of the side wall of the second housing 103. When thermal runaway occurs, the evaporated gas can be discharged through the exhaust pipe 22.

[0081] In some embodiments, a reinforcing ring 111 may be provided at the top end and / or bottom end of the housing 10. In the embodiments of the present disclosure, referring to Figure 9 , reinforcing rings 111 are provided at the top end and bottom end of the first housing 102 to increase the strength of the contact position when the first housing 102 is pressed tightly between the second housing 103 and the tray 31. Among them, the first housing 102 is a cylindrical structure without a top plate and a bottom plate, and an observation window 112 is provided on its cabinet wall. The observation window 112 and the first housing 102 may be integrally cast. At the same time, reinforcing rings 111 for strengthening the structural stiffness may be provided at the top end and bottom end of the housing wall, and steel material is used.

[0082] In some embodiments, the control module 2 may include at least one of a BMS, a PCS, a power distribution module, and a busbar module. Among them, a plurality of limiting bosses 216 may be installed on the upper end of the bottom plate of the cabinet body 211 to limit devices such as the BMS and the PCS.

[0083] In the embodiments of the present disclosure, the height of the housing 10 is 1500 mm to 1600 mm, specifically 1550 mm, the thickness is 10 mm to 20 mm, specifically 14 mm, the length may be 1000 mm to 1100 mm, specifically 1030 mm, and the width may be 900 mm to 1000 mm, specifically 960 mm. The height of the housing 10 can be adjusted according to the number of layers of the internal battery cell assembly 12. The present disclosure does not limit the size of this energy storage device.

[0084] According to the second aspect of the present disclosure, an energy storage system is further provided. The energy storage system may include at least one energy storage device, and the energy storage device is the above-mentioned energy storage device. The energy storage system has all the beneficial effects of the above-mentioned energy storage device, which will not be elaborated here.

[0085] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0086] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

[0087] In addition, any combination can be made among various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. An energy storage device, characterized in that: include: a housing, wherein the housing is adapted to form a first accommodating cavity and a second accommodating cavity, a battery module, the battery module being adapted to be disposed in the first accommodation cavity, at least a portion of the battery module being in contact with a cooling medium, and A control module, wherein the control module is suitable for being arranged in the second accommodating cavity, and the control module is electrically connected to the battery module.

2. The energy storage device according to claim 1, characterized in that: The control module is located above the battery module.

3. The energy storage device according to claim 1, characterized in that: At least a portion of the battery module is immersed in a cooling medium.

4. The energy storage device according to claim 1, characterized in that: The energy storage device also includes: The base module comprises a tray, the battery module is mounted on the tray, and the tray is provided with a liquid inlet and a liquid outlet.

5. The energy storage device according to claim 4, characterized in that: The housing comprises: A top plate, the top plate is located at the top of the first accommodating chamber, a spray assembly is installed on the top plate, and the spray assembly is connected to the liquid inlet hole through a pipeline.

6. The energy storage device according to claim 4, characterized in that: The battery module comprises: There are multiple battery cell assemblies, with gaps between adjacent battery cell assemblies. A perforated plate is installed at one of the ends of the multiple battery cell assemblies along the width direction. A liquid storage cavity is provided between the perforated plate and the shell. The liquid inlet hole is communicated with the liquid storage cavity. A through hole is opened at a position on the perforated plate corresponding to the gap.

7. The energy storage device according to claim 6, characterized in that: The tray is provided with a flow channel portion which is covered above the liquid inlet hole. The flow channel portion is constructed as a hollow structure. The top of the flow channel portion is provided with a liquid flow hole which is communicated with the liquid storage cavity.

8. The energy storage device according to claim 1, characterized in that: The battery module includes at least one battery cell assembly, which includes a plurality of battery cells stacked side by side, a front end plate and a rear end plate installed to opposite ends of the battery cell assembly along the width direction, and a pull plate connected between the front end plate and the rear end plate, and the pull plate is installed at the top and / or bottom of the battery cell assembly.

9. The energy storage device according to claim 8, characterized in that: The battery module includes a plurality of the battery cell assemblies, and the plurality of the battery cell assemblies are stacked along a height direction.

10. The energy storage device according to claim 8, characterized in that: The battery module further includes a support frame, which is detachably connected to the front end plate, the rear end plate and the shell, respectively.

11. The energy storage device according to claim 8, characterized in that: The battery module further includes a spacer block installed at the bottom end of the lowermost battery cell assembly.

12. The energy storage device according to claim 11, characterized in that: The pad includes at least one convex block and at least one concave block, the convex blocks and the concave blocks are alternately arranged in parallel in the height direction, and the width of the convex block is greater than the width of the concave block.

13. The energy storage device according to claim 1, characterized in that: The shell is constructed as a multi-layer structure, which includes a first layer and a second layer arranged in sequence along the wall thickness direction of the shell. The first layer and the second layer are both made of fiberglass. There is a cavity between the first layer and the second layer, and the cavity is filled with gas.

14. The energy storage device according to claim 1, characterized in that: The housing includes a first housing forming the first accommodating cavity and a second housing forming the second accommodating cavity.

15. The energy storage device according to claim 14, characterized in that: The second shell includes a cabinet and a cover assembly. The top end of the cabinet is open, and the cover assembly is connected to the cabinet in an openable and closable manner.

16. The energy storage device according to claim 1, characterized in that: A reinforcement ring is provided at the top end and / or the bottom end of the shell.

17. The energy storage device according to claim 1, characterized in that: The control module includes at least one of a BMS, a PCS, a power distribution module, and a busbar module.

18. An energy storage system, characterized in that: The energy storage system comprises at least one energy storage device, and the energy storage device is the energy storage device according to any one of claims 1-17.

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