Expandable electrical connection structure of energy storage equipment and energy storage equipment

Abstract

According to the expandable electrical connection structure of the energy storage equipment and the energy storage equipment, the energy storage equipment comprises a main body machine, and the main body machine comprises a first base, more than two battery boxes, a first high-voltage box and a bidirectional variable flow control box which are stacked from bottom to top; power connection and communication connection are carried out between adjacent battery boxes, between the battery box and the first high-voltage box, and between the first high-voltage box and the bidirectional variable flow control box through connectors; a first power wiring end of a first connecting piece of the first high-voltage box is electrically connected with the second power expansion end, a second power wiring end of the first connecting piece is electrically connected with a second power wiring end of a second connecting piece, and a first power wiring end of the second connecting piece is electrically connected with the first power expansion end; the communication wiring end of the first connecting piece is electrically connected with the first communication expansion end, and the communication wiring end and the first communication expansion end of the second connecting piece are electrically connected with the main control board in the first high-voltage box. Electrical connection and installation are simplified, and expandability and safety of equipment are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, and in particular to an expandable electrical connection structure of an energy storage device and the energy storage device. BACKGROUND

[0002] The main purpose of the energy storage device is to store electric energy for daily use or use when needed, and it can be used in grid-connected or off-grid mode. The energy storage system used in a home or residential environment is called a household energy storage. The household energy storage product usually includes battery modules, converters, high-voltage control modules and other components. The power connection and communication connection between different parts are achieved by using a traditional wire harness connection method, which results in a large number of cables and connectors, leading to complex installation wiring, time-consuming and error-prone, and inconvenient installation and maintenance.

[0003] In addition, when the user needs to expand the system capacity, the battery modules need to be increased and the electrical connection needs to be redesigned, which is costly and has poor scalability. In a high-voltage environment, electrical connections are prone to problems such as electric arc and overheating, and the wiring during installation may pose a safety hazard, resulting in poor safety. SUMMARY

[0004] The present application provides an expandable electrical connection structure of an energy storage device and the energy storage device to solve at least one technical problem in the background art.

[0005] In a first aspect, an embodiment of the present application provides an expandable electrical connection structure of an energy storage device, the energy storage device comprising a main body, the main body comprising a first base, two or more battery boxes, a first high-voltage box and a bidirectional converter control box stacked from bottom to top,

[0006] The adjacent battery boxes, the battery boxes and the first high-voltage box, and the first high-voltage box and the bidirectional converter control box are connected by connectors for power connection and communication connection;

[0007] Each of the connectors comprises a first connector and a second connector that can be plugged into each other, and are respectively installed on the bottom surface of the upper box body and the top surface of the lower box body stacked with each other; the first connector and the second connector each comprise a first power connection end, a second power connection end and a communication connection end;

[0008] The first high-voltage box comprises a first power expansion end, a second power expansion end and a first communication expansion end; the first power connection end of the first connector and the first power connection end of the second connector of the first high-voltage box are respectively electrically connected to the second power expansion end and the first power expansion end, the second power connection end of the first connector and the second power connection end of the second connector of the first high-voltage box are electrically connected, and the communication connection end of the first connector and the communication connection end of the second connector of the first high-voltage box are electrically connected to the first communication expansion end;

[0009] The first base and the battery box are electrically connected through a connector, and the first power connection end and the second power connection end of the second connecting piece of the first base are short-circuited.

[0010] The communication connection end of the first connecting piece and the second connecting piece comprises at least two groups of communication ports, and the two groups of communication ports of the second connecting piece of the first base are interconnected.

[0011] In combination with the first aspect of the application, in an optional implementation, the first power expansion end is configured to be short-circuited with the second power expansion end from outside the first high-voltage box.

[0012] In combination with the first aspect of the application, in an optional implementation, the energy storage device further comprises an expansion cluster, the expansion cluster comprising a second base, two or more battery boxes and a second high-voltage box stacked from bottom to top.

[0013] The adjacent battery boxes and the battery boxes and the second high-voltage box are connected through a connector for power connection and communication connection.

[0014] The second high-voltage box comprises a third power expansion end, a fourth power expansion end and a second communication expansion end, the first power connection end of the first connecting piece of the second high-voltage box is electrically connected with the fourth power expansion end, the second power connection end of the first connecting piece of the second high-voltage box is electrically connected with the third power expansion end, and the communication connection end of the first connecting piece of the second high-voltage box is electrically connected with the second communication expansion end.

[0015] The second base and the battery box are electrically connected through a connector, and the first power connection end and the second power connection end of the second connecting piece of the second base are short-circuited; the communication connection end of the first connecting piece and the second connecting piece comprises two groups of communication ports, and the two groups of communication ports of the second connecting piece of the second base are interconnected.

[0016] In combination with the first aspect of the application, in an optional implementation, the first power expansion end is configured to be electrically connected with the fourth power expansion end from outside the box body, and the second power expansion end is configured to be electrically connected with the third power expansion end from outside the box body.

[0017] In combination with the first aspect of the application, in an optional implementation, the first communication expansion end is configured to be electrically connected with the second communication expansion end from outside the box body.

[0018] In combination with the first aspect of the present application, in an optional embodiment, the first power connection end of the second connecting member of the battery box and the first power connection end of the first connecting member of the battery box are respectively connected with the positive and negative poles of the battery module in the battery box, and the second power connection end of the first connecting member of the battery box is electrically connected with the second power connection end of the second connecting member of the battery box.

[0019] In combination with the first aspect of the present application, in an optional embodiment, the communication connection end of the first connecting member of the battery box and the communication connection end of the second connecting member are both electrically connected with the slave board in the battery box.

[0020] In combination with the first aspect of the present application, in an optional embodiment, the bidirectional current conversion control box further comprises a first power quick plug and a second power quick plug, which are respectively connected with the power grid and the load.

[0021] In the second aspect, the present application provides a scalable electrical connection structure of an energy storage device.

[0022] The scalable electrical connection structure of an energy storage device and the energy storage device provided by the embodiments of the present application adopt modular design, and the first connecting member and the second connecting member of the connector are inserted in the up-down direction to realize power connection and communication connection between different modules. The power connection and the communication connection are completed by stacking the modules, which simplifies electrical wiring and equipment installation and improves safety. By setting the power expansion end and the communication port in the high-voltage box, the connecting member inside the high-voltage box is connected with the power expansion end and the communication port in advance, the two power connection ends of the second connecting member of the base are short-circuited, and the two communication connection ends are interconnected. When the capacity of the device needs to be expanded, the two power expansion ends (positive and negative connection ends) and the communication port of the main machine are connected with the two power expansion ends (positive and negative connection ends) and the communication port of the expansion cluster, respectively, so that the electrical connection of the expansion cluster can be realized simply and quickly. If the capacity of the device does not need to be expanded, the two power expansion ends (positive and negative connection ends) of the high-voltage box are short-circuited, so that the power circuit of the main machine is closed and the main machine can operate normally. In this way, the electrical connection in the process of expanding the capacity of the device is simplified, the device is easier to expand, the safety risk is greatly reduced, and the safety, scalability and use flexibility of the device are improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating any inventive labor.

[0024] Figure 1 Fig. 1 is a schematic diagram of an expandable electrical connection structure of a storage device and the storage device according to an embodiment;

[0025] Figure 2 Fig. 2 is a schematic diagram of a connector structure according to an embodiment;

[0026] Figure 3 Fig. 3 is a schematic diagram of an expandable electrical connection structure of a storage device and the storage device according to another embodiment. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The drawings show embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0029] It can be understood that the terms "first", "second" and the like used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. For example, without departing from the scope of the present application, the first resistor can be referred to as the second resistor, and similarly, the second resistor can be referred to as the first resistor. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0030] It can be understood that "connection" in the following embodiments, if the circuits, modules, units and the like connected to each other have the transmission of electrical signals or data, should be understood as "electrical connection", "communication connection" and the like.

[0031] Meanwhile, the term "and / or" used in the present specification includes any and all combinations of the relevant listed items.

[0032] The embodiments of the present application provide an expandable electrical connection structure of a storage device. The storage device can be a household storage device, which includes a main body, as shown in Fig. 1. Figure 1The first base 21, two or more battery boxes 22, 24, the first high voltage box 28 and the bidirectional current conversion control box 51 are stacked from bottom to top. The first base 21 is a flat box body for bearing other components such as the battery boxes 22, the first high voltage box 28 and the bidirectional current conversion control box 51. Each battery box is provided with a battery module 20. Optionally, the number of battery boxes can be three or more, which can be set according to requirements. The capacity of each battery box is 2.5 kWh to 15 kWh.

[0033] The adjacent battery boxes 22, 24, the battery box 24 and the first high voltage box 28, and the first high voltage box 28 and the bidirectional current conversion control box 51 are connected by connectors for power connection and communication connection. Referring to Figure 2 Each connector includes a first connector 15 and a second connector 16 which are plug-in, and are respectively installed on the top surface of the lower box body and the bottom surface of the upper box body which are stacked with each other. The first connector 71 includes a first connector 15 and a second connector 16 which are respectively installed on the bottom surface of the battery box 22 and the top surface of the first base 21. The second connector 72 includes a first connector 15 and a second connector 16 which are respectively installed on the bottom surface of the second battery box 24 and the top surface of the first battery box 22. The third connector 73 includes a first connector 15 and a second connector 16 which are respectively installed on the bottom surface of the first high voltage box 28 and the top surface of the second battery box 24. The fourth connector 74 includes a first connector 15 and a second connector 16 which are respectively installed on the bottom surface of the bidirectional current conversion control box 51 and the top surface of the first high voltage box 28. By stacking different box bodies, the first connector 15 and the second connector 16 are plug-in.

[0034] The first connector 15 and the second connector 16 of each connector include a first power terminal, a second power terminal and a communication terminal. The first connector 15 includes a first power terminal 121, a second power terminal 122 and a communication terminal 13. The first power terminal 121 and the second power terminal 122 are used for connecting the positive and negative terminals of the battery module. The communication terminal 13 is used for connecting the signal acquisition line of the battery module. The second connector 16 includes a first power terminal 111, a second power terminal 112 and a communication terminal 14. 113 and 123 are ground terminals. The communication terminals of the first connector 15 and the second connector 16 each include at least two groups of communication ports.

[0035] The first high-voltage box 28 comprises a first power extension end 45, a second power extension end 46 and a first communication extension end 44. The first power connection end of the first connecting piece and the first power connection end of the second connecting piece of the first high-voltage box 28 are electrically connected with the second power extension end and the first power extension end respectively, the second power connection end of the first connecting piece and the second power connection end of the second connecting piece of the first high-voltage box 28 are electrically connected, and the communication connection end of the first connecting piece and the communication connection end of the second connecting piece of the first high-voltage box are electrically connected with the first communication extension end. The first power connection end (positive electrode) of the first connecting piece 15 of the first high-voltage box 28 is electrically connected with the second power extension end 46, and the second power connection end (negative electrode) of the first connecting piece 15 of the first high-voltage box 28 is electrically connected with the second power connection end (negative electrode) of the second connecting piece 16 of the first high-voltage box 28. The first power connection end (positive electrode) of the second connecting piece 16 of the first high-voltage box 28 is electrically connected with the first power extension end 45, the communication connection end of the first connecting piece 15 of the first high-voltage box 28 is electrically connected with the first communication extension end 44, and the communication connection end of the second connecting piece 16 of the first high-voltage box 28 is electrically connected with the main control board 29 in the first high-voltage box 28.

[0036] The first base 21 and the first battery box 22 are electrically connected through the connector, the first power connection end (positive electrode) and the second power connection end (negative electrode) of the second connecting piece 16 of the first base 21 are short-circuited, and the two groups of communication ports of the second connecting piece 16 of the first base 21 are interconnected. Optionally, each group of communication ports comprises two connection posts, which are positive electrode and negative electrode of the communication line respectively. By connecting the two positive electrodes and the two negative electrodes of the two groups of communication ports, the interconnection of the two groups of communication ports is realized.

[0037] By short-circuiting the first power connection end (positive electrode) and the second power connection end (negative electrode) in advance, the power line at the end of the base connector is closed, so that different battery modules are connected in series and connected to the power extension end, facilitating capacity expansion. The connecting piece adopts at least two groups of communication ports, one group is used for connecting the signals collected from each battery pack in series, and the other group is used for returning the signals to the communication extension end. By interconnecting the two groups of communication ports of the second connecting piece of the first base, a loop is formed by the two groups of communication lines, and the signal line is connected to the first communication extension end, so as to facilitate the connection of the communication line during capacity expansion. By stacking the box body, the power line and the communication line can form a loop closed loop faster, without the need to open the base box for wiring, simplifying the electrical wiring.

[0038] The first connecting piece 15 of the bidirectional current conversion control box 51 is electrically connected with the main circuit board (not shown in the figure) in the bidirectional current conversion control box 51, and is used for supplying power to the main circuit board.

[0039] The internal electrical connection of each battery box is the same. Taking the first battery box 22 as an example, the first power connection end (positive electrode) of the first connector (installed at the bottom of the box) of the first battery box 22 and the first power connection end (positive electrode) of the second connector (installed at the top of the box) of the battery box are connected with the negative electrode and the positive electrode of the battery module 20 in the first battery box 22 respectively, and the second power connection end (negative electrode) of the first connector of the first battery box 22 is electrically connected with the second power connection end (negative electrode) of the second connector of the first battery box 22. The communication connection end of the first connector and the communication connection end of the second connector are both electrically connected with the slave board 23 in the first battery box 22. The slave board 25 in the second battery box 24 is used for signal acquisition and processing of the battery pack.

[0040] When the energy storage system of the embodiment is installed, the first base 21, two or more battery boxes 22 and 24, the first high-voltage box 28 and the bidirectional current conversion control box 51 are stacked in sequence, and under the action of gravity, the first connector and the second connector of the adjacent two boxes are inserted together to realize electrical connection between the adjacent two boxes. The first power expansion end 45 is configured to be short-circuited with the second power expansion end 46 from the outside of the first high-voltage box 28, so that the main machine can run independently without capacity expansion.

[0041] The bidirectional current conversion control box 51 further comprises a first power quick connector 52 and a second power quick connector 53 for connecting with the power grid and the load respectively. Optionally, the first power quick connector 52 and the second power quick connector 53 are 5-core power quick connectors. When in use, the first power quick connector 52 and the second power quick connector 53 are wired out, and a complete high-voltage household energy storage product is obtained.

[0042] The working process of the embodiment is as follows: the positive electrode of the battery module of the first battery box 22 is connected with the negative electrode of the battery module of the second battery box 24 through the two first power connection ends of the second connector 72 which are inserted into each other, the current flows out from the positive electrode of the battery module of the second battery box 24, reaches the second power expansion end 46 through the two first power connection ends of the third connector which are inserted into each other, flows to the first power expansion end 45 through the external lead wire of the high-voltage box, reaches the main circuit board of the bidirectional current conversion control box 51 through the two first power connection ends of the fourth connector 74 which are inserted into each other. Then the current flows through the two second power connection ends of the fourth connector 74 which are inserted into each other, the two second power connection ends of the third connector 73 which are inserted into each other, the two second power connection ends of the second connector 72 which are inserted into each other, the two second power connection ends of the first connector 71 which are inserted into each other, and then flows through the two first power connection ends of the first connector 71 which are inserted into each other, and returns to the negative electrode of the battery module of the first battery box 22, so as to realize the loop closure of the power line.

[0043] Each connector includes two groups of communication ports, two lines in the mutually plugged connectors 71, 72, 73, 74 are interconnected after the two groups of communication ports of the second connecting member of the first base 21, forming a communication closed loop. After signal acquisition of each battery module, the signal flows to the main circuit board of the bidirectional current control box 51 through the communication closed loop.

[0044] Figure 3 For another embodiment of the present application, the capacity expansion of the energy storage device. As shown in Figure 3 the energy storage device also includes an expansion cluster, which includes a second base 31, two or more battery boxes 32, 34, 36 and a second high-voltage box 38 stacked from bottom to top. The adjacent battery boxes 32, 34, 36 and the battery boxes and the second high-voltage box 38 are connected by the connectors for power connection and communication connection. In this embodiment, the main machine and the expansion cluster each include three battery boxes, the first battery box 22, the second battery box 24, the third battery box 26, the fourth battery box 32, the fifth battery box 34 and the sixth battery box 36. The number of battery boxes can be increased or decreased as needed.

[0045] The second high-voltage box 38 includes a third power expansion end 41, a fourth power expansion end 42 and a second communication expansion end 43. The first high-voltage box 28 and the second high-voltage box 38 are connected by the first power expansion end 45, the second power expansion end 46, the third power expansion end 41 and the fourth power expansion end 42. The first high-voltage box 28 and the second high-voltage box 38 are connected by the first communication expansion end 44 and the second communication expansion end 43.

[0046] The second base 31 and the fourth battery box 32 are connected by the connector, and the first power connection end (positive) and the second power connection end (negative) of the second connecting member of the second base 31 are short-circuited. The communication connection end of the first connecting member and the second connecting member includes two groups of communication ports, and the two groups of communication ports of the second connecting member of the second base 31 are interconnected. Optionally, each group of communication ports includes two connection posts, which are the positive and negative of the communication line respectively. By connecting the two positive and the two negative of the two groups of communication ports, the interconnection of the two groups of communication ports is realized.

[0047] The first power connection end (positive electrode) of the first connecting piece of the second high-voltage box 38 is electrically connected with the fourth power extension end 42, the second power connection end (negative electrode) of the first connecting piece of the second high-voltage box 38 is electrically connected with the third power extension end 41, and the communication connection end of the first connecting piece of the second high-voltage box 38 is electrically connected with the second communication extension end 43. The first power extension end 45 is configured to be electrically connected with the fourth power extension end 42 from the outside of the box body, and the second power extension end 46 is configured to be electrically connected with the third power extension end 41 from the outside of the box body. The first communication extension end 44 is configured to be electrically connected with the second communication extension end 43 from the outside of the box body. Through the above wiring mode, the electrical connection between the expansion cluster and the main body machine is realized, and the capacity expansion is realized.

[0048] The internal wiring mode of the battery box of the expansion cluster is described in the previous embodiment, and will not be repeated here.

[0049] If it is necessary to expand the battery capacity of the energy storage device, the expansion cluster is added, and when installed, it is ensured that the first power extension end 45 and the second power extension end 46 are not short-circuited. From the outside of the box body, the first power extension end 45 is connected with the fourth power extension end 42 by a wire, the second power extension end 46 is connected with the third power extension end 41 by a wire, and the first communication extension end 44 is connected with the second communication extension end 43 by a wire. The power line between the main body machine and the expansion cluster forms a loop, and the communication line forms a loop.

[0050] Finally, only the first power quick plug 52 and the second power quick plug 53 are connected to the user's power grid and the user's load, respectively, to complete the installation and wiring of the entire system.

[0051] The energy storage device of the present application adopts modular design, and the connectors which can be plugged into each other are used between different modules to realize power connection and communication connection of different modules. By stacking the modules, the first connecting piece and the second connecting piece of the connector can be plugged into each other, the power connection and the communication connection are completed, the electrical wiring in the installation process is simplified, the safety hidden danger in the installation process is greatly reduced, and the safety is improved.

[0052] By providing the power extension end and the communication port in the high-voltage box, the connecting piece inside the high-voltage box and the main control board are connected with the power extension end and the communication port in advance, the two power connection ends of the second connecting piece of the base are short-circuited, and the two groups of communication connection ends are interconnected. When it is necessary to expand the capacity of the device, the two power extension ends (positive and negative connection ends) of the main body machine and the communication port are connected with the two power extension ends (positive and negative connection ends) of the expansion cluster and the communication port, respectively, by wires from the outside, so that the electrical connection of the expansion cluster is simply and quickly realized, without disassembly and installation, the installation complexity when the capacity of the device is expanded is reduced, and the safety and expandability are improved.

[0053] If the capacity of the device is not required to be expanded, two power expansion ends (positive and negative connection ends) of the high-voltage box are directly short-circuited by a wire from the outside of the box, so as to complete the closed loop of the power circuit of the main machine, realize the normal operation of the energy storage system, and improve the use flexibility and expandability of the energy storage device.

[0054] The embodiment of the present application also provides an energy storage device, which refers to Figure 1 and Figure 3 comprises a main machine, and the main machine comprises a first base, two or more battery boxes, a first high-voltage box and a bidirectional current conversion control box which are stacked from bottom to top.

[0055] Optionally, the energy storage device further comprises an expansion cluster for realizing capacity expansion of the device. The expansion cluster comprises a second base, two or more battery boxes and a second high-voltage box which are stacked from bottom to top.

[0056] The energy storage device further comprises the expandable electrical connection structure of the energy storage device of any one of the above-mentioned embodiments.

[0057] Optionally, the energy storage device is a household energy storage device, a balcony energy storage device, a portable energy storage device or the like.

[0058] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that they are within the scope of the present application.

[0059] The above-mentioned embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the patent scope of the present application. It should be pointed out that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A scalable electrical connection structure of an energy storage device, characterized by, The energy storage device comprises a main body machine, the main body machine comprises a first base, two or more battery boxes, a first high-voltage box and a bidirectional current conversion control box arranged in a stack from bottom to top, The adjacent battery boxes, the battery boxes and the first high-voltage box, and the first high-voltage box and the bidirectional current conversion control box are connected by connectors for power connection and communication connection; Each of the connectors comprises a first connector and a second connector which can be plugged into each other, and are respectively installed on the bottom surface of the upper box body and the top surface of the lower box body which are stacked with each other; the first connector and the second connector each comprise a first power connection end, a second power connection end and a communication connection end; The first high-voltage box comprises a first power expansion end, a second power expansion end and a first communication expansion end; the first power connection end of the first connector and the first power connection end of the second connector of the first high-voltage box are respectively connected with the second power expansion end and the first power expansion end, the second power connection end of the first connector and the second power connection end of the second connector of the first high-voltage box are connected, and the communication connection end of the first connector and the communication connection end of the second connector of the first high-voltage box are connected with the first communication expansion end; The first base and the battery boxes are connected by connectors for power connection, and the first power connection end and the second power connection end of the second connector of the first base are short-circuited; The communication connection end of the first connector and the communication connection end of the second connector each comprise at least two groups of communication ports, and the two groups of communication ports of the second connector of the first base are interconnected.

2. The scalable electrical connection structure of an energy storage device according to claim 1, wherein The first power expansion end is configured to be short-circuited with the second power expansion end from outside the first high-voltage box.

3. The scalable electrical connection structure of an energy storage device according to claim 1, wherein The energy storage device further comprises an expansion cluster, the expansion cluster comprises a second base, two or more battery boxes and a second high-voltage box arranged in a stack from bottom to top; The adjacent battery boxes and the battery boxes and the second high-voltage box are connected by connectors for power connection and communication connection; The second high-voltage box comprises a third power expansion end, a fourth power expansion end and a second communication expansion end, the first power connection end of the first connector of the second high-voltage box is connected with the fourth power expansion end, the second power connection end of the first connector of the second high-voltage box is connected with the third power expansion end, and the communication connection end of the first connector of the second high-voltage box is connected with the second communication expansion end; The second base and the battery boxes are connected by connectors for power connection, and the first power connection end and the second power connection end of the second connector of the second base are short-circuited; the communication connection end of the first connector and the communication connection end of the second connector each comprise two groups of communication ports, and the two groups of communication ports of the second connector of the second base are interconnected.

4. The scalable electrical connection structure of an energy storage device according to claim 3, wherein The first power expansion end is configured to be connected with the fourth power expansion end from outside the box, and the second power expansion end is configured to be connected with the third power expansion end from outside the box.

5. The scalable electrical connection structure of an energy storage device according to claim 3, wherein The first communication expansion end is configured to be connected with the second communication expansion end from outside the box.

6. The scalable electrical connection structure of an energy storage device according to any one of claims 1 to 5, wherein The first power connection end of the second connecting piece of the battery box and the first power connection end of the first connecting piece of the battery box are respectively connected with the positive and negative poles of the battery module in the battery box, and the second power connection end of the first connecting piece of the battery box is electrically connected with the second power connection end of the second connecting piece of the battery box.

7. The scalable electrical connection structure of an energy storage device according to any one of claims 1 to 5, wherein The communication connection end of the first connecting piece of the battery box and the communication connection end of the second connecting piece are both electrically connected with the slave board in the battery box.

8. The scalable electrical connection structure of an energy storage device according to claim 1, wherein The bidirectional current conversion control box further comprises a first power quick plug and a second power quick plug, which are respectively connected with the power grid and the load.

9. An energy storage device, characterized by, The scalable electrical connection structure comprising the energy storage device according to any one of claims 1-8.

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