Energy storage device, energy storage system, charging grid and electric equipment

Abstract

The utility model relates to the technical field of energy storage equipment, and discloses an energy storage device, an energy storage system, a charging grid and electric equipment. The energy storage device comprises an energy storage mechanism, the energy storage mechanism comprises a box body structure and a battery assembly, the box body structure comprises a bottom cross beam and a box body, the box body is installed on the bottom cross beam, the battery assembly is installed in the box body, and one end of the bottom cross beam extends out of the box body to form an extension part; and the liquid cooling unit comprises a shell assembly and a heat dissipation assembly, the shell assembly is fixedly installed on the extending part, the shell assembly forms an assembling space, the heat dissipation assembly is assembled in the assembling space, the air outlet end of the heat dissipation assembly communicates with the exterior of the assembling space, the shell assembly is provided with a through hole, and the through hole is used for air inflow. By applying the technical scheme, the problems of low heat exchange efficiency and high energy consumption of the liquid cooling unit are solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy storage devices, and particularly relates to an energy storage device, an energy storage system, a charging grid and an electrical equipment. BACKGROUND

[0002] At present, the liquid cooling unit and the energy storage mechanism are generally designed and manufactured separately, and then the liquid cooling unit and the energy storage mechanism are assembled into an energy storage device. In the energy storage device, the liquid cooling unit is a cooling device, which cools the battery assembly of the energy storage mechanism through the cooling liquid to take away the heat generated in the working process of the battery assembly, so as to ensure the stable operation of the battery assembly. Therefore, the liquid cooling unit is one of the indispensable components of the energy storage device.

[0003] In the related art, in order to realize the overall compact assembly of the energy storage device, the liquid cooling unit is assembled in the box body of the energy storage mechanism in an embedded manner. The liquid cooling unit is wrapped in the box body, and due to the influence of the surrounding sealing plate of the box body, the liquid cooling unit can only take in air and exhaust air through the pipeline connected to the outside, which leads to insufficient air intake of the liquid cooling unit and low exhaust efficiency, and thus the overall heat exchange efficiency of the liquid cooling unit is low. In order to ensure that the battery assembly of the energy storage mechanism does not overheat and can always operate stably, it is necessary to improve the operating power of the liquid cooling unit, which leads to high overall energy consumption of the liquid cooling unit. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to provide an energy storage device, an energy storage system, a charging grid and an electrical equipment, which solves the problem of low heat exchange efficiency and high energy consumption caused by the embedded assembly of the liquid cooling unit in the related art.

[0005] To achieve the above-mentioned purpose, according to the first aspect of the embodiment of the present application, an energy storage device is provided, which comprises:

[0006] The energy storage mechanism comprises a box structure and a battery assembly, the box structure comprises a bottom beam and a box body, the box body is installed on the bottom beam, the battery assembly is installed in the box body, and one end of the bottom beam extends beyond the box body to form an extension part;

[0007] The at least one liquid cooling unit comprises a shell assembly and a heat dissipation assembly, the shell assembly is fixedly installed on the extension part, the shell assembly forms an assembly space, the heat dissipation assembly is assembled in the assembly space, the heat dissipation assembly has an air outlet end, the air outlet end is communicated to the outside of the assembly space, and the shell assembly is provided with a through hole for air intake.

[0008] The energy storage device provided by the embodiments of the present application comprises an energy storage mechanism and at least one liquid cooling unit. The bottom beam of the box structure of the energy storage mechanism extends an extension part. The extension part is used for mounting the shell assembly of the liquid cooling unit, so that the liquid cooling unit is integrated and mounted outside the box body of the energy storage mechanism, and the overall installation of the energy storage device is compact. Compared with the assembly mode in the related art in which the liquid cooling unit is wrapped in the box body, the liquid cooling unit is assembled on the extension part of the bottom beam of the box structure, so that the liquid cooling unit is assembled outside the energy storage mechanism. Then, the heat dissipation assembly of the liquid cooling unit can be directly communicated to the external environment for heat exchange. In addition, the through hole formed on the shell assembly is used as an air inlet, so that the external air can form a convection in the assembly space. The external air can smoothly enter the assembly space for heat exchange by the heat dissipation assembly, thereby improving the overall heat exchange efficiency of the liquid cooling unit. In this way, compared with the assembly mode in the related art in which the liquid cooling unit is wrapped in the box body, when the same degree of heat generated by the battery assembly of the energy storage mechanism is exchanged, the liquid cooling unit of the energy storage device can achieve the same or even better heat exchange effect with lower operating power, thereby greatly reducing the overall energy consumption of the liquid cooling unit.

[0009] In some embodiments of the present application, the shell assembly comprises a back plate opposite to the air outlet end. The back plate is arranged towards the box body and spaced apart from the corresponding side wall of the box body. At least part of the back plate is provided with the through hole. The through hole on the back plate is arranged opposite to the air outlet end of the heat dissipation assembly, so that the external air can form a convection in the assembly space. The external air can smoothly enter the assembly space for heat exchange by the heat dissipation assembly, thereby improving the overall heat exchange efficiency of the liquid cooling unit.

[0010] In some embodiments of the present application, the liquid cooling unit further comprises a plurality of connecting pieces. One end of the connecting piece is fixedly connected to the box body, and the other end is fixedly connected to the shell assembly. The plurality of connecting pieces are symmetrically arranged on both sides of the middle section of the shell assembly. The middle section is a plane parallel to the arrangement direction of the liquid cooling unit and the box structure and bisecting the shell assembly. Through the plurality of connecting pieces, the box body forms a pulling restriction and auxiliary support for the shell assembly of the liquid cooling unit, so that the relative position between the liquid cooling unit and the box body is more stable.

[0011] In some embodiments of the present application, the shell assembly comprises a frame and a plurality of plate pieces. The plurality of plate pieces are connected to the frame and form an assembly space. The frame is fixedly installed on the extension part through a bolt and nut connection pair. The other end of the connecting piece is fixedly connected to the frame, and the plate piece towards the box body is the back plate. The frame is detachably connected and fixed on the extension part through the bolt and nut connection pair, so that the liquid cooling unit 20 can be conveniently disassembled, repaired, replaced and the like.

[0012] In some embodiments of the present application, at least one of the plates other than the back plate is provided with a through hole in communication with the assembly space. In this way, air from the external environment can enter the assembly space from multiple directions of the housing assembly, and more air from the external environment is allowed to enter the assembly space, thereby improving the overall heat exchange efficiency of the liquid cooling unit.

[0013] In some embodiments of the present application, the housing assembly further comprises a partition plate connected to the frame to divide the assembly space into a first assembly space and a second assembly space, the liquid cooling unit further comprises an electromechanical assembly assembled in the first assembly space and a heat dissipation assembly assembled in the second assembly space, the battery assembly comprises a liquid cooling plate, the electromechanical assembly is configured to circulate the cooling liquid between the heat dissipation assembly and the liquid cooling plate, and the back plate is provided with a through hole in communication with the second assembly space at a region opposite to the second assembly space. In this way, air from the external environment entering the through hole of the back plate can most quickly and directly contact the heat dissipation assembly for heat exchange, thereby improving the heat exchange efficiency between the heat dissipation assembly and the flowing air and improving the overall heat exchange efficiency of the liquid cooling unit.

[0014] In some embodiments of the present application, the back plate is provided with a through hole in communication with the first assembly space at a region opposite to the first assembly space, which greatly increases the amount of air from the external environment that can reach the second assembly space and the heat dissipation assembly for heat exchange, thereby improving the overall heat exchange efficiency of the liquid cooling unit.

[0015] In some embodiments of the present application, the diameter of the through hole is less than or equal to 50 mm. In this way, the diameter of the through hole is not too large, which can block some small animals from entering the assembly space of the liquid cooling unit of the energy storage device used outdoors, preventing these small animals from damaging the lines and pipelines of the electromechanical assembly and the heat dissipation assembly.

[0016] In some embodiments of the present application, the housing assembly further comprises a plurality of gauze screens, each of which is connected to the frame and corresponds to one of the plates to cover the through hole on the corresponding plate. The mesh of the gauze screen is smaller than the diameter of the through hole on the plate, which can block small flying insects with smaller body sizes from entering the assembly space and prevent the small flying insects from polluting and eroding the lines and pipelines of the electromechanical assembly and the heat dissipation assembly.

[0017] In some embodiments of the present application, the heat dissipation assembly comprises a heat sink and at least one fan, the heat sink is installed in the second assembly space and is in communication with the liquid cooling plate, and the fan is installed on the plate facing the second assembly space and away from the back plate, and the air outlet of the fan is the air outlet end. The operation of the fan can accelerate the flow of air from the external environment to the second assembly space to contact the heat sink, greatly increasing the amount of air from the external environment that flows to the second assembly space to contact the heat sink for heat exchange, thereby improving the overall heat exchange efficiency of the liquid cooling unit.

[0018] In some embodiments of the present application, the fan is electrically connected with the battery assembly. The battery assembly directly provides the fan with the electric energy required for the operation of the fan, so as to prevent the situation that the fan stops running while the battery assembly continues to charge and discharge due to the power failure of the external power supply, thereby ensuring that the battery assembly and the fan are always synchronously operated.

[0019] In some embodiments of the present application, the electromechanical assembly includes a liquid pump, the liquid pump is electrically connected with the battery assembly, and the liquid pump, the radiator and the liquid cooling plate are in circulation communication. The battery assembly directly provides the liquid pump with the electric energy required for the operation of the liquid pump, so as to prevent the situation that the liquid pump stops running while the battery assembly continues to charge and discharge due to the power failure of the external power supply, thereby ensuring that the battery assembly and the liquid pump are always synchronously operated.

[0020] In some embodiments of the present application, the energy storage device includes a plurality of liquid cooling units, and adjacent two liquid cooling units are arranged at intervals. The plurality of liquid cooling units provide stronger heat dissipation and cooling capacity, thereby meeting the requirements of the energy storage device for required heat dissipation and cooling.

[0021] In some embodiments of the present application, the plurality of liquid cooling units are arranged at intervals along the horizontal direction, and the horizontal direction is parallel to the side wall of the box body opposite to the liquid cooling unit.

[0022] According to a second aspect of the embodiments of the present application, an energy storage system is provided. Wherein the energy storage system includes:

[0023] a power conversion device; and

[0024] The energy storage device as described above, the power conversion device is electrically connected between the power generation device and the energy storage device.

[0025] According to a third aspect of the embodiments of the present application, a charging grid is provided. Wherein the charging grid includes a charging pile; and,

[0026] The charging grid further includes the energy storage device as described above, and the charging pile is electrically connected with the energy storage device.

[0027] Alternatively, the charging grid further includes the energy storage system as described above, and the charging pile is electrically connected with the energy storage system.

[0028] Wherein, the energy storage device is used to provide the charging pile with electric energy.

[0029] According to a fourth aspect of the embodiments of the present application, an electric equipment is provided. Wherein the electric equipment includes an electric load; and,

[0030] The electric equipment further includes the energy storage device as described above, and the electric load is electrically connected with the energy storage device.

[0031] Alternatively, the electrical equipment may also include an energy storage system as described above, with the electrical load electrically connected to the energy storage system;

[0032] Among them, energy storage devices are used to store or provide electrical energy. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the assembly structure of the energy storage device according to an embodiment of this application, wherein the circumferential side plate and heat dissipation components of the liquid cooling unit are disassembled;

[0035] Figure 2 This is a front view schematic diagram of an energy storage device according to an embodiment of this application;

[0036] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0037] Figure 4 for Figure 1 Enlarged view of point B in the middle;

[0038] Figure 5 for Figure 1 The diagram shows the assembly structure of the energy storage mechanism of the energy storage device. Figure 1 ;

[0039] Figure 6 for Figure 1 The diagram shows the assembly structure of the energy storage mechanism of the energy storage device. Figure 2 ;

[0040] Figure 7 This is an exploded view of the battery assembly of the energy storage device according to an embodiment of this application;

[0041] Figure 8 This is a schematic diagram of the assembly structure of the electrical cabinet of the energy storage device according to an embodiment of this application;

[0042] Figure 9 This is a front view schematic diagram of a liquid-cooled unit of an energy storage device according to an embodiment of this application;

[0043] Figure 10 for Figure 9 The diagram shown is a left-side view of a liquid-cooled unit for an energy storage device.

[0044] Figure 11 for Figure 9An internal view of a liquid cooling unit of the energy storage device shown in the left view corresponding to the part of the second assembly space after the plate part is cut off;

[0045] Figure 12 For Figure 9 A rear view schematic diagram of a liquid cooling unit of the energy storage device shown;

[0046] Figure 13 For Figure 12 An enlarged schematic diagram at C;

[0047] Figure 14 A rear view schematic diagram of another liquid cooling unit of the energy storage device of the embodiment of the present application;

[0048] Figure 15 An assembly structure schematic diagram of an electrical equipment of the embodiment of the present application.

[0049] In the drawings, various reference numerals are used throughout the figures to indicate various elements according to examples disclosed herein.

[0050] 100, energy storage device;

[0051] 10, energy storage mechanism; 11, box structure; 111, bottom beam; 112, extension; 113, box body;

[0052] 20, liquid cooling unit; 21, shell assembly; 211, frame; 212, plate part; 213, back plate; 214, assembly space; 2141, first assembly space; 2142, second assembly space; 215, through hole; 216, partition plate; 22, electromechanical assembly; 23, heat dissipation assembly; 231, heat sink; 232, fan; 233, air outlet end; 24, connecting piece; 25, middle section;

[0053] 200, battery assembly; 201, box body; 202, box cover; 203, containing space; 204, battery monomer; 205, liquid cooling plate;

[0054] 300, energy storage cabinet; 301, cabinet body;

[0055] 400, electrical equipment; 410, electrical load; 420, control device; 430, vehicle frame; 440, track wheel. DETAILED DESCRIPTION

[0056] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0057] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0058] In addition, the terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0059] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] At present, from the development of market situation, the application of energy storage device is more and more widely. Energy storage device is applied to the supporting energy storage power supply system of power station such as hydroelectric power generation, thermal power generation, wind power generation and solar power generation. As an energy storage power station, energy storage device can store the excess power output by power station beyond the demand for electricity, reduce energy waste, and output power supply during the time period of electricity peak to relieve the power supply pressure of power station. Energy storage device is also applied to large electric power vehicles such as ships, rail trains, and many fields such as military equipment and aerospace vehicles.

[0061] With the continuous expansion of the application field of energy storage device, the product quality requirement of energy storage device is also continuously improved. Among them, in the energy storage device, the liquid cooling unit is a cooling equipment. The liquid cooling unit takes away the heat generated by the battery assembly of the energy storage mechanism in the working process through the cooling liquid to cool the system, so as to ensure the stable operation of the battery assembly. To improve the overall product quality of energy storage device, improving the quality of liquid cooling assembly is an important aspect. Among them, improving the heat exchange efficiency of liquid cooling unit to the battery assembly of energy storage mechanism, and improving the overall energy consumption of liquid cooling unit, are important research contents for improving the product quality of energy storage device.

[0062] In the related art energy storage device, the liquid cooling unit is assembled in an embedded manner in the box body of the energy storage mechanism to achieve the purpose of compact assembly. The compact energy storage device occupies less floor space, thereby reducing the land cost of the energy storage device. Since the liquid cooling unit is wrapped in the box body, the surrounding sealing plate of the box body affects the assembly position, air inlet layout, air outlet layout, etc. of the liquid cooling unit. The liquid cooling unit can only communicate with the outside through a pipeline to perform air inlet and air outlet, resulting in insufficient air inlet required by the liquid cooling unit and low air outlet efficiency, which in turn results in low overall heat exchange efficiency of the liquid cooling unit. In order to ensure that the battery assembly of the energy storage mechanism does not overheat and can always operate stably, it is necessary to improve the operating power of the liquid cooling unit, resulting in high overall energy consumption of the liquid cooling unit.

[0063] Based on the above considerations, embodiments of the present application provide an energy storage device. By improving the assembly structure between the liquid cooling unit and the energy storage mechanism, that is, integrating the liquid cooling unit on the extension of the bottom crossbeam of the energy storage mechanism, the liquid cooling unit is assembled outside the box body, and the structure of the liquid cooling unit itself is improved to improve the overall heat exchange efficiency of the liquid cooling unit, thereby reducing the overall energy consumption of the liquid cooling unit. And the energy storage device is applied to an energy storage system, a charging grid and an electrical equipment, providing electrical energy as an energy supply source in multiple fields. Among them, the energy storage device provided by the embodiments of the present application includes an energy storage mechanism and at least one liquid cooling unit, and the liquid cooling unit is installed on the extension of the bottom crossbeam of the box structure of the energy storage mechanism. Compared with the assembly method of the related art in which the liquid cooling unit is wrapped in the box body, the liquid cooling unit is assembled outside the box structure, and the heat dissipation components of the liquid cooling unit can directly communicate with the outside of the box structure for heat exchange, thereby improving the overall heat exchange efficiency of the liquid cooling unit. In this way, compared with the assembly method of the related art in which the liquid cooling unit is wrapped in the box body, when the same amount of heat generated by the battery assembly of the energy storage mechanism is exchanged, the liquid cooling unit of the energy storage device can achieve the same or even better heat exchange effect with lower operating power, thereby greatly reducing the overall energy consumption of the liquid cooling unit.

[0064] In order to illustrate the technical solutions provided by the embodiments of the present application, the following will be described in detail in combination with specific drawings and embodiments.

[0065] According to a first aspect of the embodiments of the present application, the embodiments of the present application provide an energy storage device. As shown in Figures 1 to 3 The energy storage device 100 includes an energy storage mechanism 10 and at least one liquid cooling unit 20. The energy storage mechanism 10 includes a box structure 11 and a battery assembly 200, and the battery assembly 200 is installed inside the box structure 11, that is, as shown in Figures 1 to 3As shown, the box structure 11 includes a bottom beam 111 and a box body 113, the box body 113 is mounted on the bottom beam 111, and a battery assembly 200 is mounted in the box body 113, the battery assembly 200 is a core component for storing electric energy. In some embodiments of the present application, the box body 113 can be directly assembled by using a container, and therefore the energy storage mechanism 10 is also commonly known as an energy storage container. As shown in Figures 1 to 3 、 Figure 5 and Figure 6 As shown, one end of the bottom beam 111 extends beyond the box body 113 to form an extension 112. The liquid cooling unit 20 is assembled outside the box structure 11, that is, as shown in Figures 1 to 4 、 Figures 9 to 11 The liquid cooling unit 20 includes a shell assembly 21 and a heat dissipation assembly 23, the shell assembly 21 is fixedly mounted on the extension 112, the shell assembly 21 forms an assembly space 214, and the heat dissipation assembly 23 is assembled in the assembly space 214, the heat dissipation assembly 23 has an air outlet end 233, and the air outlet end 233 is communicated to the outside of the assembly space 214. Moreover, the shell assembly 21 is provided with a through hole 215, the through hole 215 is used for air inlet, that is, the through hole 215 serves as an air inlet for the air of the external environment to flow into the assembly space 214. In this way, the air of the external environment can directly enter the assembly space 214 from the through hole 215, and then the heat dissipation assembly 23 is cooled and heat exchanged to improve the heat exchange capacity of the heat dissipation assembly 23, and therefore the overall heat exchange efficiency of the liquid cooling unit 20 is improved.

[0066] The energy storage device 100 provided by the embodiments of the present application comprises an energy storage mechanism 10 and at least one liquid cooling unit 20. The bottom beam 111 of the box structure 11 of the energy storage mechanism 10 extends an extension 112, which is used to mount the shell assembly 21 of the liquid cooling unit 20, so that the liquid cooling unit 20 is integrally mounted outside the box body 113 of the energy storage mechanism 10, so that the energy storage device 100 is compactly mounted as a whole. Compared with the assembly mode in the related art in which the liquid cooling unit is wrapped in the box body, the liquid cooling unit 20 is assembled on the extension 112 of the bottom beam 111 of the box structure 11, so that the liquid cooling unit 20 is assembled outside the energy storage mechanism 10, and then the heat dissipation assembly 23 of the liquid cooling unit 20 can be directly communicated to the external environment for heat exchange, and the through hole 215 formed on the shell assembly 21 is used as an air inlet, so that the external air can form a convection in the assembly space 214, and the external air can smoothly enter the assembly space 214 for heat exchange by the heat dissipation assembly 23, thereby improving the overall heat exchange efficiency of the liquid cooling unit 20. In this way, compared with the assembly mode in the related art in which the liquid cooling unit is wrapped in the box body, when the same degree of heat generated by the battery assembly 200 of the energy storage mechanism 10 is exchanged, the liquid cooling unit 20 of the energy storage device 100 can achieve the same or even better heat exchange effect with lower operating power, thereby greatly reducing the overall energy consumption of the liquid cooling unit 20.

[0067] In some embodiments of the present application, the shell assembly 21 comprises a back plate 213 opposite the air outlet end 233, and the back plate 213 of the shell assembly 21 faces the box body 113, and the back plate 213 is spaced apart from the corresponding side wall of the box body 113. At least part of the area of the back plate 213 is provided with a through hole 215, which is communicated with the assembly space 214. The through hole 215 on the back plate 213 is arranged opposite the air outlet end 233 of the heat dissipation assembly 23, so that the external air can form a convection in the assembly space 214, that is, the assembly space 214 is communicated with the external environment through the through hole 215. In the liquid cooling unit 20, the back plate 213 is spaced apart from the corresponding side wall of the box body 113, so that the box body 113 does not block the air of the external environment flowing into the assembly space 214, and the external air can smoothly enter the assembly space 214 for heat exchange by the heat dissipation assembly 23, thereby further helping to improve the overall heat exchange efficiency of the liquid cooling unit 20.

[0068] As Figures 1 to 4 , Figures 9 to 11As shown in the drawings, in some embodiments of the present application, the shell assembly 21 comprises a frame 211 and a plurality of plate members 212 connected to the frame 211 and enclosed to form an assembly space 214, and the frame 211 can be fixedly installed on the extension 112 of the bottom cross beam 111 by a bolt-nut connection pair, and the plate member 212 of the plurality of plate members 212 facing the box body 113 is a back plate 213.

[0069] In other embodiments of the present application, the frame 211 can also be fixed on the extension 112 of the bottom cross beam 111 by welding. In the embodiments of the present application, in order to facilitate the disassembly, maintenance, replacement and other later work of the liquid cooling unit 20, the frame 211 of the liquid cooling unit 20 is preferably fixedly installed on the extension 112 of the bottom cross beam 111 by a bolt-nut connection pair.

[0070] On the basis of the frame 211 being fixedly installed on the extension 112 by a bolt-nut connection pair, in order to make the relative position between the liquid cooling unit 20 as a whole and the box body 113 more stable, in some embodiments of the present application, as shown in the drawings, Figures 1 to 4 The liquid cooling unit 20 further comprises a plurality of connecting members 24, one end of each connecting member 24 is fixedly connected to the box body 113, the other end of each connecting member 24 is fixedly connected to the frame 211, the plurality of connecting members 24 are arranged at intervals, and on the direction perpendicular to the arrangement direction of the liquid cooling unit 20 and the box body 113, both sides of the frame 211 are provided with connecting members 24. In this way, in the height direction of the liquid cooling unit 20, the frame 211 of the liquid cooling unit 20 is connected to the box body 113 through the plurality of connecting members 24, that is, the box body 113 forms a pulling restriction and auxiliary support effect on the frame 211 of the liquid cooling unit 20, so that the relative position between the liquid cooling unit 20 as a whole and the box body 113 is more stable. Even in windy weather environment, due to the pulling restriction and auxiliary support effect of the box body 113 on the frame 211 of the liquid cooling unit 20, the liquid cooling unit 20 will not fall relative to the box body 113, ensuring that the relative position between the liquid cooling unit 20 as a whole and the box body 113 is always stable.

[0071] In some embodiments of the present application, as shown in the drawings, Figure 1 and Figure 9As shown, the plurality of connecting members 24 are symmetrically arranged on both sides of the middle section 25 of the shell assembly 21, wherein the middle section 25 is a plane parallel to the arrangement direction of the liquid cooling unit 20 and the box body 113 and bisects the shell assembly 21. That is, the pulling restriction, auxiliary support force and position of the plurality of connecting members 24 on the frame 211 of the liquid cooling unit 20 are symmetric with respect to the middle section 25, and these forces do not cooperate with each other to form a torsion effect on the frame 211, thereby ensuring that the relative position between the liquid cooling unit 20 and the box body 113 is always stable.

[0072] In some embodiments of the present application, as shown in Figure 1 、 Figure 2 、 Figures 9 to 12 and Figure 14 , in addition to the back plate 213, at least part of the other plate members 212 are provided with through holes 215 communicating with the assembly space 214. In some embodiments of the present application, at least part of the plate members 212 are provided with through holes 215 communicating with the assembly space 214, or almost the entire plate surface of the plate members 212 is provided with through holes 215 communicating with the assembly space 214. In the embodiments of the present application, through holes 215 are provided on all plate members 212 connected to the frame 211 and enclosing the assembly space 214, so that air from the external environment can enter the assembly space 214 from multiple directions of the shell assembly 21, and more air from the external environment is allowed to enter the assembly space 214. Then, the external air contacts the heat dissipation assembly 23 for heat exchange, and under the action of air convection, the air in the assembly space 214 that has completed heat exchange flows out from the air outlet end 233 to the external environment, thereby cooling the heat dissipation assembly 23. In this way, the overall heat exchange efficiency of the liquid cooling unit 20 is further improved.

[0073] As shown in Figure 1 , in some embodiments of the present application, the shell assembly 21 further comprises a partition plate 216 connected to the frame 211 to divide the assembly space 214 into a first assembly space 2141 and a second assembly space 2142. As shown in Figure 1 and Figure 3 , the liquid cooling unit 20 further comprises an electromechanical assembly 22 assembled in the first assembly space 2141 and a heat dissipation assembly 23 assembled in the second assembly space 2142. As shown in Figure 7 , the battery assembly 200 comprises a liquid cooling plate 205 for cooling and cooling (i.e. heat exchange) the heat generated by the battery assembly 200 during charging and discharging. The electromechanical assembly 22 is used to circulate the cooling liquid between the heat dissipation assembly 23 and the liquid cooling plate 205, so that the cooling liquid carries the heat generated by the battery assembly 200 absorbed by the liquid cooling plate 205 to the heat dissipation assembly 23 for heat dissipation and cooling. And as shown in Figure 12As shown, the back plate 213 is provided with a through hole 215 in the region facing the second assembly space 2142, which is in communication with the second assembly space 2142. When the cooling liquid continuously circulates to the heat dissipation assembly 23 under the power provided by the electromechanical assembly 22, the distance between the through hole 215 of the back plate 213 facing the second assembly space 2142 and the heat dissipation assembly 23 is the shortest compared with the distance between the other plate members 212 and the heat dissipation assembly 23. Therefore, the air from the external environment entering through the through hole 215 of the back plate 213 can most quickly and directly contact the heat dissipation assembly 23 for heat exchange. Then, the air after the heat exchange flows out from the air outlet end 233 to the external environment under the action of air convection, so that the entering air can complete the heat exchange with the heat dissipation assembly 23 at the fastest speed, thereby improving the heat exchange efficiency between the heat dissipation assembly 23 and the flowing air, that is, improving the overall heat exchange efficiency of the liquid cooling unit 20.

[0074] In order to further improve the heat exchange efficiency between the heat dissipation assembly 23 and the flowing air, in some embodiments of the present application, as shown in Figure 14 In addition to the through hole 215 in the region of the back plate 213 facing the second assembly space 2142, the region of the back plate 213 facing the first assembly space 2141 is also provided with a through hole 215 in communication with the first assembly space 2141. That is, the through hole 215 is provided in almost the entire surface range of the back plate 213, which greatly improves the amount of air from the external environment that can reach the second assembly space 2142 and contact the heat dissipation assembly 23 for heat exchange, and also makes the air from the external environment more smoothly reach the second assembly space 2142. In this way, the heat exchange efficiency between the heat dissipation assembly 23 and the flowing air can be further improved, thereby improving the overall heat exchange efficiency of the liquid cooling unit 20.

[0075] As shown in Figure 7 In some embodiments of the present application, the battery assembly 200 further includes a box body 201, a box cover 202 and a plurality of battery monomers 204. The box cover 202 covers the open end of the box body 201, and the box body 201 and the box cover 202 cover to form a containing space 203. The plurality of battery monomers 204 are arrayed and assembled in the containing space 203, wherein the battery monomers 204 are used for storing electric energy or power supply. The liquid cooling plate 205 is assembled in the containing space 203, and the plurality of battery monomers 204 are in contact with the liquid cooling plate 205, so that the heat generated by the battery monomers 204 during charging and discharging can be transferred to the liquid cooling plate 205, and then the cooling liquid flowing through the liquid cooling plate 205 can take away the heat transferred to the liquid cooling plate 205, thereby cooling the battery monomers 204.

[0076] The battery monomer 204 can be a secondary battery, which refers to a battery monomer 204 that can be activated by charging after discharging. The battery monomer 204 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc. The present application is not limited to this. In addition, the battery monomer 204 provided by the present application is a square monomer, also known as a square monomer. The battery assembly 200 assembled by the square battery monomer 204 is also square in shape, also known as a square battery, such as Figure 7 and Figure 8 The battery assembly 200 is shown.

[0077] As shown in Figure 8 In some embodiments of the present application, the battery assembly 200 can further include a thermal management module, a master control module, a total control module, a power distribution module, and a fire-fighting module.

[0078] In some embodiments of the present application, the battery assembly 200 can further include a thermal management module, a master control module, a total control module, a power distribution module, and a fire-fighting module.

[0079] As an example, the thermal management module can control the flow of cooling liquid provided to the liquid cooling plate 205 for adjusting the temperature of the battery monomer 204 through the pipeline and valve.

[0080] As an example, the master control module can serve as a battery management unit of the battery assembly 200 for monitoring and managing the battery assembly 200. The master control module can monitor the current, voltage, power, or temperature of the battery assembly 200. For example, the charging and discharging current and voltage of the battery assembly 200 can be controlled. The master control module includes an auxiliary battery management unit SBMU (Slave Battery Management Unit, SBMU), a fusion switch, and other modules.

[0081] As an example, the central control module can serve as the battery management unit of the battery pack 200, used to monitor and manage the battery pack 200. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the battery pack 200. For example, it can control the charging and discharging current and voltage of the battery pack 200. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0082] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in the energy storage system.

[0083] As an example, the power distribution module can be used to distribute power to the modules in the battery pack 200 that require power.

[0084] like Figure 13 As shown, in some embodiments of this application, the aperture D of the through hole 215 is less than or equal to 50 mm, that is, 0 < D ≤ 50 mm. This prevents the aperture of the through hole 215 from being too large, thus preventing small animals (such as birds, cats, dogs, etc.) from entering the assembly space 214 of the liquid-cooled unit 20 of the energy storage device 100 used outdoors, and preventing these small animals from damaging the wiring and piping of the electromechanical components 22 and the heat dissipation components 23. At the same time, it also prevents large dead branches from falling from trees from entering the assembly space 214 and damaging the electromechanical components 22 and the heat dissipation components 23.

[0085] In some other embodiments of this application, in order to prevent smaller animals from entering the assembly space 214, the aperture D of the through hole 215 is preferably less than 10 mm, i.e., 0 < D ≤ 10 mm. In this way, the small through hole 215 can effectively block mice from entering the assembly space 214, thereby preventing mice from biting or damaging the wiring and pipes of the electromechanical component 22 and the heat dissipation component 23.

[0086] In some embodiments of the present application, the shell assembly 21 further comprises a plurality of gauze pieces, each of which is connected to the frame 211 and is arranged in one-to-one correspondence with the plurality of plate pieces 212 to cover the through holes 215 on the corresponding plate pieces 212. The mesh of the gauze is smaller than the aperture of the through holes 215 on the plate pieces 212, which not only prevents mice of small body size from entering the assembly space 214 and biting or damaging the lines and pipelines of the electromechanical assembly 22 and the heat dissipation assembly 23, but also prevents small flying insects of even smaller body size from entering the assembly space 214 and causing pollution and erosion to the lines and pipelines of the electromechanical assembly 22 and the heat dissipation assembly 23. The gauze includes but is not limited to wire mesh, plastic mesh, etc., as long as the aperture of the mesh of the gauze is smaller than the aperture of the through holes 215 on the plate pieces 212, which meets the use requirements, and thus is not limited herein.

[0087] As Figure 9 and Figure 11As shown, in some embodiments of the present application, the heat dissipation assembly 23 comprises a heat sink 231 and at least one fan 232, wherein the heat sink 231 comprises but is not limited to a heat sink composed of multiple pieces of sheet-shaped heat sink plates, a heat exchanger composed of heat pipes and heat sink plates, etc. (the plate structure has a large contact surface and a good heat exchange efficiency). The heat sink 231 is installed in the second assembly space 2142, the heat sink 231 is in communication with the liquid cooling plate 205, the fan 232 is installed on the plate member 212 which encloses the second assembly space 2142 and is opposite to the back plate 213 (i.e. the plate member 212 faces the second assembly space 2142 and is away from the back plate 213), and the air outlet of the fan 232 is the air outlet end 233. During the process of continuously circulating the cooling liquid conveyed by the electromechanical assembly 22, the cooling liquid absorbs the heat inside the battery assembly 200 when passing through the liquid cooling plate 205, and then flows to the heat sink 231, and the fan 232 is started to drive the air flow, i.e. the air of the external environment continuously enters the assembly space 214 through the through hole 215 of the plate member 212 and contacts the heat sink 231, so that the air exchanges heat with the heat sink 231, and the air after heat exchange is discharged to the external environment through the air outlet end 233 under the pumping action of the fan 232, so that the cooling liquid circulating through the heat sink 231 is cooled by heat dissipation, and the cooling liquid continues to circulate back to the liquid cooling plate 205 to continue to absorb the heat generated inside the battery assembly 200, and so on. Since the region of the back plate 213 opposite to the first assembly space 2141 is also provided with a through hole 215 in communication with the first assembly space 2141, or at least part of the plate member 212 other than the back plate 213 is also provided with a through hole 215 in communication with the assembly space 214 (i.e. the through hole 215 is provided on all plate members 212 connected to the frame 211 and enclosing the assembly space 214), and the fan 232 is started to accelerate the air flow of the external environment to reach the second assembly space 2142 and contact the heat sink 231, greatly increasing the amount of air of the external environment flowing to the second assembly space 2142 and contacting the heat sink 231 for heat exchange, so as to improve the heat exchange efficiency between the heat sink 231 and the flowing air, thereby improving the overall heat exchange efficiency of the liquid cooling unit 20 and reducing the overall energy consumption of the liquid cooling unit 20.

[0088] In some embodiments of the present application, the fan 232 is electrically connected with the battery assembly 200, and the battery assembly 200 directly provides the fan 232 with the electric energy required for the operation of the fan 232. Of course, the fan 232 can also be electrically connected with an external power supply to obtain the electric energy required for the operation. Compared with the fan 232 being electrically connected with the external power supply, the application of the battery assembly 200 directly providing the fan 232 with the electric energy can reduce the wiring length of the electric wire, reduce the amount of the electric wire used, and reduce the cost. Moreover, the application of the battery assembly 200 directly providing the fan 232 with the electric energy can also prevent the situation that the fan 232 stops operating due to the power failure of the external power supply while the battery assembly 200 continues the charging and discharging operation, so as to ensure that the battery assembly 200 and the fan 232 always operate synchronously.

[0089] In some embodiments of the present application, the electromechanical assembly 22 includes but is not limited to a liquid pump, and the electromechanical assembly 22 can also include a filter, a control valve (such as a pressure valve, an overflow valve, a one-way valve), etc. The liquid pump includes but is not limited to a vane pump, a gear pump, a peristaltic pump, etc. The liquid pump, the radiator 231, and the liquid cooling plate 205 are in circulation communication, and the liquid pump provides power for the circulation of the cooling liquid between the liquid cooling plate 205 and the heat dissipation assembly 23, and is the core component of the electromechanical assembly 22. The liquid pump is electrically connected with the battery assembly 200, and the battery assembly 200 directly provides the liquid pump with the electric energy required for the operation of the liquid pump. Of course, the liquid pump can also be electrically connected with an external power supply to obtain the electric energy required for the operation. Compared with the liquid pump being electrically connected with the external power supply, the application of the battery assembly 200 directly providing the liquid pump with the electric energy can reduce the wiring length of the electric wire, reduce the amount of the electric wire used, and reduce the cost. Moreover, the application of the battery assembly 200 directly providing the liquid pump with the electric energy can also prevent the situation that the liquid pump stops operating due to the power failure of the external power supply while the battery assembly 200 continues the charging and discharging operation, so as to ensure that the battery assembly 200 and the liquid pump always operate synchronously.

[0090] In the liquid cooling unit 20 of the energy storage device provided in the embodiments of the present application, the electromechanical assembly 22 has heat dissipation and cooling capability, that is, the electromechanical assembly 22 almost does not need to rely on the heat dissipation assembly 23 to dissipate heat and cool down, in other words, the heat dissipation assembly 23 mainly dissipates heat and cools down the cooling liquid circulating from the liquid cooling plate 205 to the heat dissipation assembly 23 (i.e., heat exchange), so that the cooling liquid dissipates heat and cools down after absorbing the heat generated inside the battery assembly 200, and then the cooling liquid continues to circulate back to the liquid cooling plate 205 to continue to absorb the heat generated inside the battery assembly 200, and so on. However, in the process of circulating the cooling liquid driven by the electromechanical assembly 22, the cooling liquid flows through the electromechanical assembly 22, so that the cooling liquid carries away part of the heat of the electromechanical assembly 22 to a certain extent when flowing through the electromechanical assembly 22, thereby actually assisting the electromechanical assembly 22 to dissipate heat and cool down. Moreover, since the back plate 213 is provided with the through hole 215 communicating with the first assembly space 2141 in the region of the first assembly space 2141, or at least part of the plate member 212 other than the back plate 213 is provided with the through hole 215 communicating with the assembly space 214 (i.e., the through hole 215 is provided on all plate members 212 connected to the frame 211 and surrounding the assembly space 214), the air in the external environment enters and reaches the second assembly space 2142 through these through holes 215, and contacts the electromechanical assembly 22 in the process, so that the flowing air exchanges heat with the electromechanical assembly 22 to a certain extent, thereby further assisting the electromechanical assembly 22 to dissipate heat and cool down. Therefore, in the energy storage device provided in the embodiments of the present application, compared with the assembly mode in the related art in which the liquid cooling unit is wrapped in the box body, not only the heat exchange efficiency of the liquid cooling unit 20 is improved, but also the heat dissipation and cooling capability of the electromechanical assembly 22 is improved to a certain extent, thereby further improving the overall heat exchange efficiency of the liquid cooling unit 20 and reducing the overall energy consumption of the liquid cooling unit 20.

[0091] For different application scenarios of the energy storage device 100, the number of liquid cooling units 20 required to be used by the energy storage device 100 is different. For some small energy storage devices 100, one liquid cooling unit 20 can meet the requirements of heat dissipation and cooling according to the requirements thereof. However, in some embodiments of the present application, for some large energy storage devices 100, as shown in FIG. 1, the energy storage device 100 includes a plurality of liquid cooling units 20, and the plurality of liquid cooling units 20 provide stronger heat dissipation and cooling capability, thereby meeting the requirements of heat dissipation and cooling required by the large energy storage device 100. Figure 1 Moreover, the adjacent two liquid cooling units 20 are arranged at intervals, that is, the adjacent two liquid cooling units 20 do not block each other, so that the air in the external environment can smoothly enter the assembly space 214 of the two liquid cooling units 20 from the space between the adjacent two liquid cooling units 20, thereby ensuring that the liquid cooling unit 20 has higher heat exchange efficiency.

[0092] As shown in FIG. 1, in some embodiments of the energy storage device 100 according to the present application, a plurality of liquid cooling units 20 are arranged side by side in a horizontal direction, which is parallel to a side wall of the box body 113 opposite to the back plate 213 of the housing assembly 21 of the liquid cooling unit 20. Generally, two liquid cooling units 20 can meet the cooling requirement of the battery assembly 200 in a large energy storage device 100. Figure 1

[0093] According to a second aspect of the embodiments of the present application, the embodiments of the present application further provide an energy storage system. The energy storage system comprises a power conversion device and the energy storage device 100 as described above, the power conversion device is electrically connected between a power generation device and the energy storage device 100, wherein the battery assembly 200 of the energy storage device 100 is used to store or provide electric energy.

[0094] Further, the energy storage system can comprise one or more power conversion devices (PCS). The power generation device is used to generate electric energy, and the electric energy generated by the power generation device can be stored in the battery assembly 200 of the energy storage device 100 through the power conversion device. As an example, the power generation device can be a solar panel, a water power generation device, a fire power generation device, a wind power generation device, etc. The specific type of the power generation device is not limited in the present application.

[0095] According to a third aspect of the embodiments of the present application, the embodiments of the present application further provide a charging grid comprising a charging pile.

[0096] In some embodiments of the present application, the charging grid further comprises an energy storage system as described above, and the charging pile is electrically connected with the energy storage system, wherein the battery assembly 200 of the energy storage device 100 of the energy storage system is used to store electric energy, or the battery assembly 200 of the energy storage device 100 of the energy storage system is used to provide electric energy for the charging pile.

[0097] The charging pile can have one or more connectors, which are used to connect with the charging interface of the device to be charged (such as an electric vehicle), so as to supplement the energy storage unit (such as the battery of an electric vehicle) of the device to be charged.

[0098] According to a fourth aspect of the embodiments of the present application, the embodiments of the present application further provide a power consumption device 400, which comprises a power consumption load 410.

[0099] The power consumption device 400 includes but is not limited to a rail car, a ship, a spacecraft, a large electric power processing or experimental equipment in a factory, etc., and the energy storage device or the energy storage system serves as the power supply source of these devices. The spacecraft can include but is not limited to an airplane, a rocket, a space shuttle and a spacecraft, etc.​

[0100] In some embodiments of the present application, the power utilization device 400 further comprises the energy storage system as described above, the power utilization load 410 is electrically connected with the energy storage system, the battery assembly 200 of the energy storage device 100 of the energy storage system is used to store electric energy, or the battery assembly 200 of the energy storage device 100 of the energy storage system is used to provide electric energy for the power utilization load 410, so that the power utilization load 410 can be normally operated.

[0101] Alternatively, in some other embodiments of the present application, the power utilization device 400 further comprises the energy storage device 100 as described above, that is, the power utilization device 400 adopts one energy storage device 100 or adopts multiple energy storage devices 100 in series, parallel or hybrid connection, and the power utilization load 410 is electrically connected with the energy storage device 100. The battery assembly 200 of the energy storage device 100 is used to store electric energy, or the battery assembly 200 of the energy storage device 100 is used to provide electric energy for the power utilization load 410, so that the power utilization load 410 can be normally operated.

[0102] In some embodiments of the present application, the power utilization device 400 is a rail train, and the energy storage device 100 is assembled as shown in Figure 15 The energy storage device 100 is installed on the frame 430 of the rail train. The rail train comprises the frame 430, a driving motor and a rail wheel 440, the energy storage device 100 and the driving motor are fixedly installed on the frame 430, the rail wheel 440 is rotatably connected to the frame 430, and the energy storage device 100 is electrically connected with the driving motor, and the driving motor is drivingly connected with the rail wheel 440. The driving motor is powered by the energy storage device 100 provided by the present application (the driving motor is one of the power utilization loads 410 of the power utilization device 400), so that the driving motor drives the rail wheel 440 to rotate, so that the rail train can be normally operated. In addition, the rail train comprises a control device 420, the control device 420 is installed on the frame 430, the control device 420 is electrically connected with the energy storage device 100, and the control device 420 is used to control and monitor the charging and discharging working state of the energy storage device 100. In some rail trains, the box structure 11 of the energy storage device 100 can be used as a part of the body structure of the power head.

[0103] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An energy storage device, characterized by, The energy storage device comprises: a storage mechanism comprising a box structure and a battery assembly, the box structure comprising a bottom beam and a box body, the box body being mounted on the bottom beam, the battery assembly being mounted in the box body, one end of the bottom beam extending beyond the box body to form an extension; at least one liquid cooling unit, the liquid cooling unit comprising a shell assembly and a heat dissipation assembly, the shell assembly being fixedly mounted on the extension, the shell assembly forming an assembly space, the heat dissipation assembly being assembled in the assembly space, the heat dissipation assembly having an air outlet end, the air outlet end being communicated to the outside of the assembly space, and the shell assembly being provided with a through hole for air inlet.

2. The energy storage device according to claim 1, wherein the shell assembly comprises a back plate opposite to the air outlet end, the back plate being arranged towards the box body and spaced apart from a corresponding side wall of the box body, at least a part of the back plate being provided with the through hole.

3. The energy storage device according to claim 2, wherein the liquid cooling unit further comprises a plurality of connecting pieces, one end of each connecting piece being fixedly connected to the box body and the other end being fixedly connected to the shell assembly, the plurality of connecting pieces being symmetrically arranged on both sides of a middle section of the shell assembly, the middle section being a plane parallel to the arrangement direction of the liquid cooling unit and the box structure and bisecting the shell assembly.

4. The energy storage device according to claim 3, wherein the shell assembly comprises a frame and a plurality of plate pieces, the plurality of plate pieces being connected to the frame and enclosing the assembly space, the frame being fixedly mounted on the extension by a bolt-nut connection pair, and the other end of each connecting piece being fixedly connected to the frame, the plate piece towards the box body being the back plate.

5. The energy storage device according to claim 4, wherein at least a part of the plate pieces other than the back plate are provided with the through hole communicated to the assembly space.

6. The energy storage device according to claim 5, wherein the shell assembly further comprises a partition plate connected to the frame to divide the assembly space into a first assembly space and a second assembly space, the liquid cooling unit further comprises an electromechanical assembly assembled in the first assembly space and a heat dissipation assembly assembled in the second assembly space, the battery assembly comprises a liquid cooling plate, the electromechanical assembly is used to circulate the cooling liquid between the heat dissipation assembly and the liquid cooling plate, and the region of the back plate opposite to the second assembly space is provided with the through hole communicated to the second assembly space.

7. The energy storage device according to claim 6, wherein the region of the back plate opposite to the first assembly space is provided with the through hole communicated to the first assembly space.

8. The energy storage device according to claim 7, wherein the aperture of the through hole is less than or equal to 50 mm.

9. The energy storage device according to claim 7, wherein The shell assembly further comprises a plurality of gauze screens, each of the gauze screens is connected to the frame, and each of the gauze screens is arranged corresponding to one of the plate members to cover the through hole on the corresponding plate member.

10. The energy storage device of claim 6, wherein, The heat dissipation assembly comprises a heat sink and at least one fan, the heat sink is installed in the second assembly space, the heat sink is in communication with the liquid cooling plate, the fan is installed on the plate member facing the second assembly space and away from the back plate, and the air outlet of the fan is the air outlet end.

11. The energy storage device of claim 10, wherein, The fan is electrically connected to the battery assembly.

12. The energy storage device of claim 11, wherein, The electromechanical assembly comprises a liquid pump, the liquid pump is electrically connected to the battery assembly, and the liquid pump, the heat sink and the liquid cooling plate are in circulation communication.

13. The energy storage device of any one of claims 1-4, wherein, The energy storage device comprises a plurality of liquid cooling units, and two adjacent liquid cooling units are arranged at intervals.

14. The energy storage device of claim 13, wherein, A plurality of liquid cooling units are arranged at intervals side by side in a horizontal direction, and the horizontal direction is parallel to a side wall of the box body opposite to the liquid cooling unit.

15. An energy storage system characterized by, Comprising: a power conversion device; and The energy storage device of any one of claims 1-14, wherein the power conversion device is electrically connected between a power generation device and the energy storage device.

16. A charging grid, characterized by comprising a charging pile; The charging grid further comprises the energy storage device of any one of claims 1-14, wherein the charging pile is electrically connected to the energy storage device; or, the charging grid further comprises the energy storage system of claim 15, wherein the charging pile is electrically connected to the energy storage system; wherein the energy storage device is configured to provide electrical energy to the charging pile.

17. An electrical device, characterized by comprising an electrical load; The electrical equipment further comprises the energy storage device of any one of claims 1-14, wherein the electrical load is electrically connected to the energy storage device; or, the electrical equipment further comprises the energy storage system of claim 15, wherein the electrical load is electrically connected to the energy storage system; wherein the energy storage device is configured to store or provide electrical energy.

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