Battery energy storage system

Abstract

The utility model belongs to the technical field of energy storage, disclose a kind of battery energy storage system, the battery energy storage system includes electrically conductive connection component and at least two energy storage boxes, energy storage box includes first box and battery module, battery module is set in first box, the first box of at least two energy storage boxes is in turn detachably stacked, the battery module of adjacent two energy storage boxes is electrically conductive connection by a group of electrically conductive connection component, the battery energy storage system is the split structure of assembly, not only reduce the volume, weight and cost of energy storage box, still can according to the electricity demand of user selection corresponding number of energy storage box is stacked or laid flat, satisfy different electricity demand while still applicable to a variety of site area.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to a battery energy storage system. Background Technology

[0002] Existing energy storage systems mostly adopt a containerized structure, with all battery modules of the energy storage system housed inside the energy storage container.

[0003] The aforementioned containerized energy storage system is large in size, heavy in weight, expensive in cost, and difficult to transport. The battery modules are integrated with the energy storage container, and the system's power capacity is a fixed value, which cannot adapt to different power demands. Furthermore, when users have high power demands, the number of battery modules needs to be increased to meet the users' high power demands, but this will increase the footprint of the energy storage container. If the user's site area is small, it cannot be installed.

[0004] Therefore, there is an urgent need to propose a battery energy storage system to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this utility model is to provide a battery energy storage system. This battery energy storage system is an assemblable split structure, which not only reduces the volume, weight and cost of the energy storage box, but also allows users to select the appropriate number of energy storage boxes to stack or lay flat according to their power needs, so as to meet different power needs and be applicable to various site areas.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Battery energy storage systems include:

[0008] At least two energy storage boxes, each energy storage box including a first box body and a battery module, the battery module being disposed in the first box body, the first box bodies of the at least two energy storage boxes being detachably stacked in sequence;

[0009] A conductive connection assembly is used to electrically connect the battery modules of two adjacent energy storage boxes.

[0010] Optionally, the battery energy storage system also includes a refrigerant communication structure, and the energy storage box also includes a cooling plate. The cooling plate is disposed inside the first box and is attached to the battery module. The cooling plates of two adjacent energy storage boxes are connected through a set of refrigerant communication structures.

[0011] Optionally, the energy storage box also includes a first refrigerant pipe and a second refrigerant pipe, both of which are installed inside the first box. The first refrigerant pipe is connected to the inlet of the cooling plate, and the second refrigerant pipe is connected to the outlet of the cooling plate.

[0012] The refrigerant connection structure includes a first quick connector assembly and a second quick connector assembly. The first refrigerant pipes of two adjacent energy storage boxes are connected through the first quick connector assembly, and the second refrigerant pipes of two adjacent energy storage boxes are connected through the second quick connector assembly.

[0013] Optionally, the first quick connector assembly includes a first male connector and a first female connector. In two adjacent energy storage boxes, the bottom of the first box of one box is provided with a first male connector, and the top of the first box of the other box is provided with a first female connector. The first male connector is detachably inserted into the first female connector. The first male connector is connected to the first refrigerant pipe in the first box where the first male connector is located, and the first female connector is connected to the first refrigerant pipe in the first box where the first female connector is located.

[0014] The second quick-connect assembly includes a second male connector and a second female connector. In two adjacent energy storage boxes, the bottom of the first box of one box is provided with a second male connector, and the top of the first box of the other box is provided with a second female connector. The second male connector is detachably plugged into the second female connector. The second male connector is connected to the second refrigerant pipe in the first box where the second male connector is located, and the second female connector is connected to the second refrigerant pipe in the first box where the second female connector is located.

[0015] Optionally, the conductive connection assembly includes a male connector and a female connector. One of the top and bottom of the same first housing is provided with a male connector, and the other is provided with a female connector. Both the male connector and the female connector on the same first housing are conductively connected to the battery module inside the first housing. In two adjacent energy storage boxes, the male connector of one can be detachably plugged into the female connector of the other.

[0016] Optionally, the inner wall of the first enclosure is covered with a heat insulation layer.

[0017] Optionally, the energy storage box also includes a bracket, which is disposed inside the first box, and the battery module is fixed on the bracket.

[0018] Optionally, each corner of the top of the first box is provided with a corner protector, which extends out of the top surface of the first box. In two adjacent energy storage boxes, each corner protector of the lower first box abuts against the corresponding position of the upper first box.

[0019] Alternatively, each corner of the bottom of the first housing is provided with a corner protector, which extends out of the bottom surface of the first housing. In two adjacent energy storage boxes, each corner protector of the upper first housing abuts against the corresponding position of the lower first housing.

[0020] Optionally, the battery energy storage system further includes an electrical control box, which includes a second box and an electrical control element disposed in the second box. The battery modules of at least two energy storage boxes are electrically connected to the electrical control element. The first boxes of at least two energy storage boxes are detachably stacked to form an energy storage unit, and the second box and the energy storage unit are detachably stacked.

[0021] Optionally, the energy storage units can be detachably stacked on top of the second housing.

[0022] The beneficial effects of this utility model are:

[0023] The battery energy storage system provided by this utility model has at least two energy storage boxes whose first boxes are detachably stacked in sequence, and the battery modules of two adjacent energy storage boxes are electrically connected through a set of conductive connection components. This design enables the battery energy storage system to form an assemblable split structure, which not only reduces the volume, weight and cost of the energy storage boxes, making them easy to transport, but also allows users to select the appropriate number of energy storage boxes to stack according to their power needs. The stacked energy storage boxes are electrically connected through conductive connection components, enabling two or more energy storage boxes to operate normally when stacked. The detachable stackable structure allows the battery energy storage system to be selectively stacked or laid flat according to the installation site area, making the battery energy storage system suitable for various installation environments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the battery energy storage system provided by this utility model;

[0025] Figure 2 This is an exploded structural diagram of the energy storage box provided by this utility model;

[0026] Figure 3 This is a first structural schematic diagram of the energy storage box provided by this utility model;

[0027] Figure 4 This is a schematic diagram of the second structure of the energy storage box provided by this utility model;

[0028] Figure 5 yes Figure 2 Enlarged view of a portion of point A in the middle.

[0029] In the picture:

[0030] 1. Energy storage unit; 11. Energy storage box; 111. First box; 112. Battery module; 113. Cooling plate; 114. First refrigerant pipe; 115. Second refrigerant pipe; 116. Insulation layer; 117. Bracket; 118. Corner protector; 1181. First protective plate; 1182. Second protective plate; 21. Male connector; 22. Female connector; 311. First male connector; 312. First female connector; 321. Second male connector; 322. Second female connector; 4. Electrical control box; 41. Second box. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] This embodiment provides a battery energy storage system with an assemblable, modular structure. This not only reduces the volume, weight, and cost of the energy storage box, but also allows users to select the appropriate number of energy storage boxes to stack or lay flat according to their power needs. This satisfies different power requirements and is suitable for various site sizes.

[0036] Specifically, such as Figure 1 and Figure 2 As shown, the battery energy storage system includes conductive connection components and at least two energy storage boxes 11. Each energy storage box 11 includes a first box body 111 and a battery module 112. The battery module 112 is disposed within the first box body 111. The first box bodies 111 of at least two energy storage boxes 11 are stacked detachably in sequence. The battery modules 112 of two adjacent energy storage boxes 11 are electrically connected through a set of conductive connection components. In this embodiment, there are two energy storage boxes 11. In other embodiments, the number of energy storage boxes 11 can be three, four, or more, depending on the user's power demand.

[0037] Based on the above design, the first housing 111 of at least two energy storage boxes 11 are stacked detachably in sequence, and the battery modules 112 of two adjacent energy storage boxes 11 are electrically connected through a set of conductive connection components. This design enables the battery energy storage system to form an assemblable split structure, which not only reduces the volume, weight and cost of the energy storage boxes 11, making them easy to handle, but also allows the first housing 111 of at least two energy storage boxes 11 to be disassembled for transportation, thus avoiding restrictions on sea or air transport. Furthermore, the split structure makes maintenance operations more flexible and simplified. This structure also allows for the selection of an appropriate number of energy storage boxes 11 for stacking according to the user's power demand. The stacked energy storage boxes 11 are electrically connected through conductive connection components, enabling two or more energy storage boxes 11 to operate normally after being stacked. The detachable stackable structure allows the battery energy storage system to be selectively stacked or laid flat according to the installation site area, making the battery energy storage system suitable for various installation environments.

[0038] It should be noted that the first boxes 111 of at least two energy storage boxes 11 can be directly stacked in sequence to achieve detachable stacking, or a protruding first locking block can be set on the top of the first box 111 and a first locking groove can be set on the bottom of the first box 111. The first locking block of each first box 111 can be locked into the first locking groove of another first box 111 on the top of the first box 111, thereby achieving detachable stacking of two adjacent first boxes 111.

[0039] Optionally, such as Figure 3 and Figure 4As shown, the conductive connection assembly includes a male connector 21 and a female connector 22. One of the top and bottom of the same first housing 111 is provided with a male connector 21, and the other with a female connector 22. Both the male connector 21 and the female connector 22 on the same first housing 111 are conductively connected to the battery module 112 inside the first housing 111. In two adjacent energy storage boxes 11, the male connector 21 of one can be detachably plugged into the female connector 22 of the other. This structural design enables rapid conductive connection of the battery modules 112 of two adjacent energy storage boxes 11. Specifically, the first housing 11 of the two energy storage boxes 11... When stacking 11, the male connector 21 on one first housing 111 is aligned with the female connector 22 on the other first housing 111. Then, the upper first housing 111 is stacked on top of the lower first housing 111. During this process, the male connector 21 is inserted into the female connector 22, thus achieving a conductive connection between the battery modules 112 of the two energy storage boxes 11. It can be seen that this structural design eliminates the need for additional conductive connection operations after stacking at least two first housings 111, which simplifies the battery energy storage system assembly process and improves assembly efficiency, enabling the battery energy storage system to be put into use quickly.

[0040] It should be noted that the above-mentioned conductive connection components can adopt XT60 plugs, T-type plugs, XT30 plugs, EC2 plugs, EC3 plugs or EC5 plugs that are commonly used in the field. They all include a male plug and a female plug. Their specific structure and conductive principle will not be described in detail here.

[0041] In this embodiment, the male connector 21 is located at the top of the first housing 111, and the female connector 22 is located at the bottom of the first housing 111. Of course, in other embodiments, the male connector 21 may be located at the bottom of the first housing 111, and the female connector 22 may be located at the top of the first housing 111.

[0042] In other embodiments, the conductive connection component includes a conductive cable, with both ends of the conductive cable passing through two adjacent first boxes 111 and electrically connected to the battery modules 112 inside the corresponding first boxes 111, thereby realizing the conductive connection of the battery modules 112 of the two adjacent energy storage boxes 11.

[0043] Optionally, the battery energy storage system also includes a refrigerant communication structure, and the energy storage box 11 also includes a cooling plate 113. The cooling plate 113 is disposed inside the first box 111 and is attached to the battery module 112. The cooling plates 113 of two adjacent energy storage boxes 11 are connected through a set of refrigerant communication structures. After several energy storage boxes 11 are stacked, the cooling plates 113 in several energy storage boxes 11 can be connected through the refrigerant communication structure so that the battery module 112 in each energy storage box 11 can be cooled by the cooling plate 113 in the same energy storage box 11, thereby improving the safety of the battery energy storage system.

[0044] The aforementioned cooling plate 113 can be a water-cooled plate with cooling water flowing inside, or a liquid-cooled plate with refrigerant flowing inside, depending on the actual application requirements.

[0045] Furthermore, the energy storage box 11 also includes a first refrigerant pipe 114 and a second refrigerant pipe 115. Both the first refrigerant pipe 114 and the second refrigerant pipe 115 are located inside the first housing 111. The first refrigerant pipe 114 is connected to the inlet of the cooling plate 113, and the second refrigerant pipe 115 is connected to the outlet of the cooling plate 113. The refrigerant connection structure includes a first quick connector assembly and a second quick connector assembly. The first refrigerant pipes 114 of two adjacent energy storage boxes 11 are connected through the first quick connector assembly, and the second refrigerant pipes 115 of two adjacent energy storage boxes 11 are connected through the second quick connector assembly, so as to realize the connection of the cooling plates 113 of the two adjacent energy storage boxes 11.

[0046] Furthermore, the first quick-connect assembly includes a first male connector 311 and a first female connector 312. In two adjacent energy storage boxes 11, the bottom of the first box 111 of one is provided with the first male connector 311, and the top of the first box 111 of the other is provided with the first female connector 312. The first male connector 311 is detachably inserted into the first female connector 312. The first male connector 311 is connected to the first refrigerant pipe 114 inside the first box 111 where the first male connector 311 is located, and the first female connector 312 is connected to the first refrigerant pipe 114 inside the first box 111 where the first female connector 312 is located. The second quick connector assembly includes a second male connector 321 and a second female connector 322. In two adjacent energy storage boxes 11, the bottom of the first box 111 of one is provided with the second male connector 321, and the top of the first box 111 of the other is provided with the second female connector 322. The second male connector 321 is detachably inserted into the second female connector 322. The second male connector 321 is connected to the second refrigerant pipe 115 in the first box 111 where the second male connector 321 is located, and the second female connector 322 is connected to the second refrigerant pipe 115 in the first box 111 where the second female connector 322 is located.

[0047] This structural design enables rapid connection of the cooling plates 113 of two adjacent energy storage boxes 11. Specifically, when stacking the first boxes 111 of two energy storage boxes 11, the first male connector 311 on one first box 111 is aligned with the first female connector 312 on the other first box 111, and the second male connector 321 on one first box 111 is aligned with the second female connector 322 on the other first box 111. Then, the upper first box 111 is stacked on top of the lower first box 111. During this process, the first male connector 311 is inserted into the first female connector 312, and the second male connector 321 is inserted into the second female connector 322, thus enabling the cooling plates 113 of the two energy storage boxes 11 to connect with each other. It can be seen that this structural design eliminates the need for additional cooling plate 113 connection operations after stacking at least two first boxes 111, which simplifies the battery energy storage system assembly process, thereby improving assembly efficiency and enabling the battery energy storage system to be put into use quickly.

[0048] It should be noted that the first quick coupling assembly and the second quick coupling assembly mentioned above can adopt the male and female connector structures that are common in the art, such as Danfoss FD83 series liquid-cooled quick couplings or UQD series quick couplings, etc. Their specific structures and connection principles will not be described in detail here.

[0049] In this embodiment, the first male connector 311 and the second male connector 321 are both located on the top of the first housing 111, and the first female connector 312 and the second female connector 322 are both located on the bottom of the first housing 111. Of course, in other embodiments, the first male connector 311 and the second male connector 321 may be located on the bottom of the first housing 111, and the first female connector 312 and the second female connector 322 may be located on the top of the first housing 111.

[0050] In this embodiment, each first housing 111 contains two battery modules 112 to increase the energy storage capacity of each energy storage box 11. Each first housing 111 also contains two cooling plates 113, each corresponding to one of the two battery modules 112, ensuring rapid cooling of each battery module 112 and allowing it to operate at a suitable temperature. Within the same first housing 111, the inlets of both cooling plates 113 are connected to the same first refrigerant pipe 114, and the outlets of both cooling plates 113 are connected to the same second refrigerant pipe 115, achieving parallel connection of the two cooling plates 113 within the same first housing 111 and ensuring both cooling plates 113 in the same first housing 111 have good cooling performance.

[0051] In other embodiments, the refrigerant connection structure includes a main inlet pipe and a main outlet pipe. The first refrigerant pipe 114 in each first housing 111 passes through the corresponding first housing 111 and is connected to the main inlet pipe. The second refrigerant pipe 115 in each first housing 111 passes through the corresponding first housing 111 and is connected to the main outlet pipe, so as to realize the connection of the cooling plates 113 of two adjacent energy storage tanks 11.

[0052] Optionally, the first male connector 311, the first female connector 312, the second male connector 321, the second female connector 322, the plug-in male connector 21, and the plug-in female connector 22 are all located on the same side along the length of the first housing 111, so as to simplify the assembly process of the above-mentioned components with the first housing 111, and also reduce the difficulty of docking the above-mentioned male connectors with their corresponding female connectors, which is conducive to improving production efficiency.

[0053] Optionally, such as Figure 2 As shown, the battery energy storage system also includes a heat insulation layer 116, which covers the inner wall of the first housing 111, reducing the heat transfer from the external environment to the first housing 111, improving the heat insulation effect of the energy storage box 11, and enabling the energy storage box 11 to pass the global regional fire resistance test requirements.

[0054] In this embodiment, the first box 111 has a cuboid structure, and each of the six inner walls of the first box 111 is covered with a heat insulation layer 116. Of course, in other embodiments, the first box 111 can also be a pentagonal prism or other structures, and several of the multiple inner walls of the first box 111 can be covered with heat insulation layers 116, depending on the actual application requirements.

[0055] In this embodiment, the heat insulation layer 116 can be one or more of expanded polystyrene board, extruded polystyrene board, rock wool board or polyurethane foam board, depending on the actual application requirements.

[0056] Optionally, the energy storage box 11 also includes a bracket 117, which is disposed inside the first box 111. The battery module 112 is fixed on the bracket 117. The bracket 117 provides good support for the battery module 112 and simplifies the assembly of the battery module 112 with the first box 111. The battery module 112 is fixed on the bracket 117 outside the first box 111, and then the bracket 117 with the battery module 112 fixed on it is inserted into the first box 111.

[0057] Furthermore, the cooling plate 113 is fixed on the bracket 117, which provides good support for the cooling plate 113. After the battery module 112 and the cooling plate 113 are fixed on the bracket 117 outside the first housing 111, the bracket 117 with the battery module 112 and the cooling plate 113 fixed on it can be installed into the first housing 111, which simplifies the assembly process of the battery module 112, the cooling plate and the first housing 111.

[0058] Optionally, such as Figure 1 , Figure 2 and Figure 5 As shown, each apex corner of the first housing 111 is provided with a corner protector 118, which extends out of the top surface of the first housing 111. In two adjacent energy storage housings 11, the corner protector 118 of the lower first housing 111 abuts against the corresponding position of the upper first housing 111. This structure not only protects the apex corner of each first housing 111, but also limits the position of the upper first housing 111 in two adjacent energy storage housings 11, preventing the stacked first housings 111 from tilting or even collapsing. This provides a strong guarantee for the structural reliability of the stacked first housings 111. In addition, since the corner protectors 118 are located at the apex corners of the first housing 111, there is no need to consider the avoidance of the corner protectors 118 with the plane when the first housing 111 is placed on a flat surface such as the ground.

[0059] Furthermore, the corner protector 118 includes a first protective piece 1181 and a second protective piece 1182. The first protective piece 1181 and the second protective piece 1182 are connected to make the corner protector 118 approximately L-shaped. The first protective piece 1181 and the second protective piece 1182 are respectively connected to two adjacent side walls of the first housing 111. The first protective piece 1181 and the second protective piece 1182 both extend out of the top surface of the first housing 111, and the portions of the first protective piece 1181 and the second protective piece 1182 extending out of the top surface of the first housing 111 respectively abut against two adjacent side walls of another first housing 111 stacked on top of the first housing 111.

[0060] In another embodiment, each of the top corners of the bottom of the first housing 111 is provided with a corner guard 118. The corner guard 118 extends out of the bottom surface of the first housing 111. In two adjacent energy storage boxes 11, each corner guard 118 of the upper first housing 111 abuts against the corresponding position of the lower first housing 111, so as to protect the top corner of each first housing 111 and also prevent the problem of several stacked first housings 111 from tilting or even collapsing.

[0061] Optionally, such as Figure 1As shown, the battery energy storage system also includes an electronic control box 4. The electronic control box 4 includes a second box 41 and an electronic control element (not shown in the figure) disposed in the second box 41. The battery modules 112 of at least two energy storage boxes 11 are electrically connected to the electronic control element. The first boxes 111 of at least two energy storage boxes 11 are stacked detachably in sequence to form an energy storage unit 1. The second box 41 and the energy storage unit 1 are stacked detachably. Thus, the electronic control box 4 and the energy storage unit 1 form an assemblable split structure, which eliminates the need to set an electronic control element in each first box 111. This has the effect of improving the space utilization of the first box 111, and thus helps to improve the energy density of each energy storage box 11.

[0062] Furthermore, the energy storage unit 1 is detachably stacked on top of the second housing 41. When it is necessary to add or remove energy storage boxes 11, there is no need to move the control box 4; the energy storage boxes 11 can simply be added or removed from the top of the energy storage unit 1. Of course, in other embodiments, the second housing 41 can also be detachably stacked on top of the energy storage unit 1.

[0063] It should be noted that the energy storage unit 1 can be stacked on top of the second housing 41 to achieve detachable stacking of the two, or a protruding second card block can be provided at the bottom of the energy storage unit 1 and a second card slot can be provided at the top of the second housing 41, with the second card block locked in the second card slot to achieve detachable stacking of the energy storage unit 1 and the second housing 41.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery energy storage system, characterized in that, include: At least two energy storage boxes (11), each energy storage box (11) includes a first box body (111) and a battery module (112), the battery module (112) being disposed inside the first box body (111), and the first box bodies (111) of at least two energy storage boxes (11) being stacked in a detachable manner in sequence; The battery modules (112) of two adjacent energy storage boxes (11) are electrically connected through a set of the conductive connection components.

2. The battery energy storage system according to claim 1, characterized in that, The battery energy storage system also includes a refrigerant communication structure, and the energy storage box (11) also includes a cooling plate (113). The cooling plate (113) is disposed inside the first box (111) and is attached to the battery module (112). The cooling plates (113) of two adjacent energy storage boxes (11) are connected through a set of refrigerant communication structures.

3. The battery energy storage system according to claim 2, characterized in that, The energy storage box (11) also includes a first refrigerant pipe (114) and a second refrigerant pipe (115). The first refrigerant pipe (114) and the second refrigerant pipe (115) are both installed inside the first box (111). The first refrigerant pipe (114) is connected to the inlet of the cooling plate (113), and the second refrigerant pipe (115) is connected to the outlet of the cooling plate (113). The refrigerant connection structure includes a first quick connector assembly and a second quick connector assembly. The first refrigerant pipes (114) of two adjacent energy storage boxes (11) are connected through the first quick connector assembly, and the second refrigerant pipes (115) of two adjacent energy storage boxes (11) are connected through the second quick connector assembly.

4. The battery energy storage system according to claim 3, characterized in that, The first quick connector assembly includes a first male connector (311) and a first female connector (312). In two adjacent energy storage boxes (11), the first male connector (311) is provided at the bottom of the first box body (111) of one of them, and the first female connector (312) is provided at the top of the first box body (111) of the other. The first male connector (311) is detachably inserted into the first female connector (312). The first male connector (311) is connected to the first refrigerant pipe (114) in the first box body (111) where the first male connector (311) is located. The first female connector (312) is connected to the first refrigerant pipe (114) in the first box body (111) where the first female connector (312) is located. And / or, the second quick connector assembly includes a second male connector (321) and a second female connector (322). In two adjacent energy storage boxes (11), the bottom of the first box (111) of one is provided with the second male connector (321), and the top of the first box (111) of the other is provided with the second female connector (322). The second male connector (321) is detachably inserted into the second female connector (322). The second male connector (321) is connected to the second refrigerant pipe (115) in the first box (111) where the second male connector (321) is located. The second female connector (322) is connected to the second refrigerant pipe (115) in the first box (111) where the second female connector (322) is located.

5. The battery energy storage system according to any one of claims 1-4, characterized in that, The conductive connection assembly includes a male connector (21) and a female connector (22). The male connector (21) is provided on one of the top and bottom of the same first housing (111), and the female connector (22) is provided on the other. The male connector (21) and the female connector (22) on the same first housing (111) are conductively connected to the battery module (112) inside the first housing (111). In two adjacent energy storage boxes (11), the male connector (21) of one is detachably plugged into the female connector (22) of the other.

6. The battery energy storage system according to any one of claims 1-4, characterized in that, The inner wall of the first housing (111) is covered with a heat insulation layer (116).

7. The battery energy storage system according to any one of claims 1-4, characterized in that, The energy storage box (11) also includes a bracket (117), which is disposed inside the first box (111), and the battery module (112) is fixed on the bracket (117).

8. The battery energy storage system according to any one of claims 1-4, characterized in that, Each of the top corners of the first box (111) is provided with a corner guard (118), which extends out of the top surface of the first box (111). In two adjacent energy storage boxes (11), each corner guard (118) of the lower first box (111) abuts against the corresponding position of the upper first box (111). Alternatively, each of the top corners of the bottom of the first box (111) is provided with a corner guard (118), the corner guard (118) extending out of the bottom surface of the first box (111), and in two adjacent energy storage boxes (11), each of the corner guards (118) of the upper first box (111) abuts against the corresponding position of the lower first box (111).

9. The battery energy storage system according to any one of claims 1-4, characterized in that, The battery energy storage system also includes an electrical control box (4), which includes a second box (41) and an electrical control element disposed in the second box (41). The battery modules (112) of at least two energy storage boxes (11) are electrically connected to the electrical control element. The first boxes (111) of at least two energy storage boxes (11) are stacked in sequence to form an energy storage unit (1), and the second box (41) is stacked in sequence with the energy storage unit (1).

10. The battery energy storage system according to claim 9, characterized in that, The energy storage unit (1) is detachably stacked on top of the second housing (41).

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