Converter integrated cabinet and energy storage system

Abstract

The embodiment of the application provides a kind of converter integrated cabinet and energy storage system, it is related to the technical field of power conversion equipment.The converter integrated cabinet includes first heat insulation cabin, AC conducting bar and converter;AC conducting bar is set in first heat insulation cabin, and at least one end of AC conducting bar penetrates the cabin wall of first heat insulation cabin and extends to the outside of first heat insulation cabin, and first heat insulation cabin is provided with first opening;Converter includes power conversion circuit, DC terminal and AC terminal, DC terminal is used to connect DC source and DC end of power conversion circuit, power conversion circuit is used to realize the bidirectional power conversion of DC and AC, AC terminal is used to connect the AC end of power conversion circuit and AC conducting bar, and AC terminal is set on any side of converter;AC terminal passes through first opening and is connected with AC conducting bar.In this way, AC conducting bar in the converter integrated cabinet is isolated, and the heat generated by the heat dissipation of AC conducting bar is reduced to reduce the working efficiency of converter.

Description

Technical Field

[0001] This application relates to the technical field of power conversion equipment, and more particularly to a converter integrated cabinet and energy storage system. Background Technology

[0002] The converter integrated cabinet is the core equipment in the energy storage system. It is mainly used to realize bidirectional power conversion between the energy storage cabinet and the power grid and / or bidirectional power conversion between the energy storage cabinet and the power generation system to ensure the stability of the power grid.

[0003] In related technologies, the converter integrated cabinet includes a cabinet and a converter and a busbar installed inside the cabinet. When transmitting current, the busbar generates a lot of heat due to its resistance, which affects the operation of the converter. Summary of the Invention

[0004] This application provides a converter integrated cabinet and an energy storage system, the purpose of which is to isolate the AC busbars inside the converter integrated cabinet and reduce the heat dissipation of the AC busbars that would reduce the converter's operating efficiency.

[0005] In a first aspect, embodiments of this application provide a converter integrated cabinet, which includes a cabinet body and a first heat-insulating chamber, an AC busbar, and a converter disposed within the cabinet body. The AC busbar is disposed within the first heat-insulating chamber, and at least one end of the AC busbar extends through the chamber wall to the outside of the first heat-insulating chamber. The AC busbar is used to transmit AC power input to or output to the converter. The first heat-insulating chamber has a first opening. The converter includes a power conversion circuit, DC terminals, and AC terminals. The DC terminals are used to connect a DC source to the input terminal of the power conversion circuit. The power conversion circuit is used to realize bidirectional power conversion between DC and AC. The AC terminals are used to connect the output terminal of the power conversion circuit to the AC busbar. The AC terminals are disposed on any side of the converter. The AC terminals pass through the first opening and are connected to the AC busbar.

[0006] Based on the converter integrated cabinet of this application embodiment, the converter needs to operate within an allowable temperature range, and according to Joule's law (Q=I... 2 Rt, Q represents the heat generated; I represents the current flowing through the conductor; R represents the resistance of the conductor; t represents the energizing time;). When the AC bus transmits AC power, it will inevitably generate heat. Since the current flowing through the AC bus is large, and the Joule heat Q is proportional to the square of the current I, the AC bus in the converter integrated cabinet will generate a great deal of heat when transmitting AC power. In this application, after the AC bus is placed in the first heat insulation chamber, the heat generated by the AC bus when transmitting AC power will be isolated in the first heat insulation chamber, reducing the impact of the heat dissipated by the AC bus when transmitting AC power on the converter.

[0007] At least one end of the AC busbar penetrates the wall of the first insulated compartment. The end of the AC busbar outside the first insulated compartment is used to connect external electrical equipment, such as a transformer or an AC busbar connected in series with another converter integrated cabinet to form a string converter integrated cabinet.

[0008] Joule heating refers to the heat released when electrical energy is converted into internal energy (thermal energy) as an electric current passes through a conductor, due to the conductor's resistance.

[0009] In some possible implementations, the first heat insulation chamber and the AC terminal are located on the same side of the converter, with the AC terminal located on the side of the converter facing the first heat insulation chamber, and the first opening located on the side of the first heat insulation chamber facing the converter. Along the arrangement direction of the converter and the first heat insulation chamber, the orthographic projection of the AC terminal on the first heat insulation chamber is within the outline of the first opening.

[0010] In this feasible method, the AC terminals and the first heat insulation chamber are located on the same side of the converter, that is, the AC terminals, the first heat insulation chamber, and the AC busbar are located on the same side of the converter. The first opening is located on the side of the first heat insulation chamber facing the converter, and the AC terminals are located on the side of the converter facing the first heat insulation chamber. Thus, the side of the first heat insulation chamber with the first opening and the side of the converter with the AC terminals face each other. Based on this, along the arrangement direction of the converter and the first heat insulation chamber, the orthographic projection of the AC terminals on the first heat insulation chamber is within the outline of the first opening. Then, the converter moves towards the first heat insulation chamber along the arrangement direction of the converter and the first heat insulation chamber, so that the AC terminals can be inserted into the first opening to connect the AC busbar, which facilitates the connection between the converter and the AC busbar.

[0011] In some feasible implementations, the converter integration cabinet includes multiple converters arranged side by side, a first insulated chamber having multiple first openings, and the AC terminals of each converter passing through one opening and connected to an AC busbar.

[0012] In this feasible approach, multiple converters can correspond to one first insulation chamber, which improves the power density and integration of the converter integrated cabinet.

[0013] In some feasible implementations, the converter integrated cabinet includes two rows of converters, each row of converters includes multiple converters, the arrangement direction of the multiple converters in each row is perpendicular to the arrangement direction of the two rows of converters, the back plate of one row of converters is arranged facing the back plate of the other row of converters and there is a gap; a first heat insulation chamber is disposed in the gap, and the two side walls of the first heat insulation chamber facing the two rows of converters are provided with multiple first openings, and the AC terminal of each converter passes through one first opening and is connected to the AC busbar.

[0014] In this feasible method, the converter integrated cabinet is equipped with two rows of converters. The first heat insulation chamber is placed in the gap between the two rows of converters, and the AC terminals are placed on the back plate of the converters. The first heat insulation chamber has multiple first openings on both side walls facing the two rows of converters. The AC terminals of each converter pass through one first opening and are connected to the AC busbar. Thus, the two rows of converters can share one first heat insulation chamber, which not only reduces the heat transferred from the AC busbar to other electrical components, but also simplifies the structure of the converter integrated cabinet.

[0015] Furthermore, the first heat insulation chamber is at least partially located in the gap between the two rows of converters, which utilizes the space between the two rows of converters and improves the power density of the converter integrated cabinet.

[0016] In some feasible implementations, the converter integrated cabinet includes a set of AC busbars, each set of AC busbars comprising three AC busbars arranged side by side, with multiple AC terminals of all converters connected to the three AC busbars.

[0017] In this feasible method, when the AC busbars are grouped together, one row of converters or two rows of converters are connected to a group of AC busbars. This reduces the number of AC busbars, simplifying the structure of the converter integrated cabinet. Furthermore, the spacing between the opposing surfaces of the two rows of converters can be smaller, resulting in a smaller volume of the converter integrated cabinet and improved power density of the converter.

[0018] In some feasible implementations, the converter integrated cabinet includes two sets of AC busbars, which are arranged side by side along the arrangement direction of the two rows of converters. Each set of AC busbars includes three AC busbars. Multiple AC terminals of a row of converters are connected to the three AC busbars in one set of AC busbars.

[0019] In this feasible method, each group of AC busbars corresponds to a row of converters, meaning that multiple converters within a row of converters are connected to the corresponding group of AC busbars. This reduces the AC current transmitted by each group of AC busbars; and according to Q=I... 2 If the current is halved (Rt), the heat generated is reduced by a factor of four. Therefore, the heat generated by the same current shunted through two sets of AC busbars is reduced. For example, if the AC current output from the two converters is 4A, according to Q=I... 2 When there is one set of AC busbars, Q = 16Rt; when there are two sets of AC busbars, each set of AC busbars only needs to transmit 2A of AC current, so the heat generated by each AC busbar when transmitting AC current is Q = 4Rt, and the total heat generated by the two sets of AC busbars is 8Rt. It can be seen that the heat generated by the AC busbars is significantly reduced.

[0020] In some feasible implementations, the converter integrated cabinet also includes a support assembly, which is disposed within the first insulation chamber and fixed to the inner wall of the first insulation chamber, and the support assembly connects the AC terminals and the AC busbar.

[0021] In this feasible method, AC terminals and AC busbars are connected through a support assembly. This eliminates the need to limit the positional relationship between the AC terminals and AC busbars, allowing the AC busbars to be placed in locations that facilitate heat dissipation or are far away from other electrical components within the cabinet. In other words, the arrangement of the AC busbars offers greater flexibility.

[0022] In some feasible implementations, the support assembly includes a first support and a second support, the first support being fixed to the inner wall of the first insulation chamber and extending along the arrangement direction of the converter, one end of the second support being connected to the first support and the other end of the second support being connected to the AC busbar.

[0023] In this feasible method, the first branch is fixed to the inner wall of the first insulation chamber, thereby fixing the first branch and preventing it from shifting due to force when connected to the AC terminal, thus ensuring that the AC terminal and the first branch can be reliably connected.

[0024] The first branch extends along the direction of the converter to facilitate connection of the first branch to the AC terminal. One end of the second branch is connected to the first branch, and the other end extends to the AC busbar and is connected to the AC busbar.

[0025] In some possible implementations, the AC terminals are arranged along the side of the first insulation chamber where the first opening is located and the side of the converter where the AC terminals are located. The AC terminals have notches on the side facing away from the converter, and the first branch has protrusions on the side facing the AC terminals. The protrusions are inserted into the notches.

[0026] In this feasible method, a notch is provided in the AC terminal, and the AC terminal is aligned with the first opening so that the converter moves toward the first heat insulation chamber along the arrangement direction of the converter and the AC terminal. After the AC terminal extends into the first opening, the protrusion on the first branch is inserted into the notch on the AC terminal, thereby realizing the connection between the AC terminal and the first branch and forming a quick-connect structure, which facilitates the assembly and disassembly of the AC terminal and the first branch.

[0027] In some feasible configurations, the AC terminals are arranged along the side of the first insulation chamber where the first opening is located and the side of the converter where the AC terminals are located. The AC terminals have notches on the side facing away from the converter, and the AC busbars have protrusions facing the AC terminals. The protrusions are inserted into the notches.

[0028] In this feasible method, a notch is provided in the AC terminal, and the AC terminal is aligned with the first opening so that the converter moves toward the first heat insulation chamber along the arrangement direction of the converter and the AC terminal. After the AC terminal extends into the first opening, the protrusion on the AC busbar is inserted into the notch on the AC terminal to realize the connection between the AC terminal and the AC busbar, forming a quick-connect structure, which facilitates the assembly and disassembly of the AC terminal and the AC busbar.

[0029] In some feasible implementations, the converter integrated cabinet also includes a heat exchanger housed within the cabinet, which is connected to the first insulation chamber.

[0030] In this feasible method, the temperature inside the first insulation chamber, i.e., the temperature of the AC busbar, is reduced by a heat exchanger installed inside the cabinet.

[0031] In some possible implementations, along the arrangement of the side of the first insulation chamber with the first opening and the side of the converter with the AC terminals, the first insulation chamber extends from the side with the first opening toward the converter and is provided with a first seal, which surrounds the periphery of the AC terminals.

[0032] In this feasible method, after the AC terminal is plugged into the first opening, the first seal surrounds the periphery of the AC terminal, sealing the AC terminal and the first opening, thereby reducing the risk of heat leakage from the first opening into the cabinet from the first insulation chamber.

[0033] In some possible implementations, the first insulation chamber is provided with a second opening, one end of the AC busbar extends through the second opening to the outside of the first insulation chamber; a second seal is provided extending from the side of the first insulation chamber away from the first insulation chamber where the second opening is provided, the second seal surrounding the periphery of the AC busbar.

[0034] In this feasible method, the end of the AC bus extends to the outside of the first insulation chamber through the second opening, which facilitates the connection of the AC bus to external electrical equipment. A second seal is provided in the first insulation chamber. The second seal surrounds the AC bus and seals the gap between the AC bus and the second opening, reducing the risk of heat leakage from the first insulation chamber into the cabinet through the second opening.

[0035] In some possible configurations, the front and back panels of each converter are positioned opposite each other, with the DC terminals located on the front panel; or, the front panel of the converter has a lower edge protruding from the bottom wall of the converter in the height direction of the cabinet, with the DC terminals located on the side of the lower edge facing the back panel of the other row of converters; or, the DC terminals are located on the back panel.

[0036] In this feasible method, since the front and back panels of each converter are arranged opposite each other, and the DC terminals are placed on the front panel, the DC terminals and AC terminals on the same converter are located on opposite sides of the converter. In this way, the input cables connected to the DC terminals and the AC busbars connected to the AC terminals are located on opposite sides of the converter. The input cables for inputting DC power and the AC busbars for outputting AC power do not interfere with each other, and the partitioning of input cables and AC busbars inside the converter integrated cabinet is obvious.

[0037] When the bottom wall of the converter has a protruding lower edge, the DC terminals are located on the side of the lower edge facing the other row of converters. In this case, although the input cables connected to the DC terminals and the AC busbars connected to the AC terminals are not located on opposite sides of the converter, they are still misaligned in the arrangement direction of the front and rear panels of the converter. The input cables for DC power input and the AC busbars for AC power output do not interfere with each other. Furthermore, if the coolant leaks inside the converter, it will flow down the side wall of the converter. However, because the DC terminals are located on the lower edge, the risk of coolant flowing into the DC terminals is reduced, improving the safety performance of the converter integrated cabinet.

[0038] When both DC and AC terminals are located on the back panel of the converter, since the converter is usually connected to the liquid cooling unit on the front panel, placing both DC and AC terminals on the back panel means that if a leak occurs at the connection between the converter and the liquid cooling unit, the coolant will flow down along the front panel of the converter, reducing the risk of coolant flowing into the DC and AC terminals and improving the safety performance of the converter integrated cabinet.

[0039] In some feasible implementations, the converter integrated cabinet includes a DC bus and a second heat insulation chamber; the DC bus is disposed in the second heat insulation chamber, one end of the DC bus extends out of the second heat insulation chamber through the chamber wall, and the DC bus is used to transmit DC power into or out of the converter; the second heat insulation chamber is provided with a third opening, through which DC terminals pass and are connected to the DC bus.

[0040] In this feasible method, the principle is the same as that of AC bus transmitting AC power. When DC bus transmits DC power, it will inevitably generate heat. After the DC bus is placed in the second heat insulation chamber, the heat generated by the DC bus when transmitting DC power will be isolated in the second heat insulation chamber, reducing the impact of the heat dissipated by the DC bus when transmitting DC power on the converter.

[0041] One end of the DC busbar extends through the wall of the second heat insulation chamber to the outside of the wall to connect to the DC source. The DC terminal passes through the third opening and is connected to the end of the DC conductive sheet located inside the second heat insulation chamber, so as to transmit the current output by the DC source to the converter, or transmit the DC power output by the converter to the DC source.

[0042] In some possible implementations, the second insulation chamber extends from the side with the third opening toward the converter and is provided with a third seal, which surrounds the periphery of the DC terminal.

[0043] In this feasible method, after the DC terminal is plugged into the third opening, the third seal surrounds the periphery of the DC terminal, sealing the DC terminal and the third opening, thereby reducing the risk of heat leakage from the third opening into the cabinet from the second heat insulation chamber.

[0044] In some possible implementations, the second heat insulation chamber is provided with a fourth opening, one end of the DC bus extends through the fourth opening to the outside of the second heat insulation chamber; the second heat insulation chamber is provided with a fourth seal extending away from the side wall provided with the fourth opening, the fourth seal surrounding the periphery of the DC bus.

[0045] In this feasible method, the end of the DC bus extends to the outside of the second heat insulation chamber through the fourth opening, which facilitates the connection of the DC bus to a DC source. A fourth seal is provided in the second heat insulation chamber. The fourth seal surrounds the DC bus and seals the gap between the DC bus and the fourth opening, reducing the risk of heat leakage from the second heat insulation chamber into the cabinet through the fourth opening.

[0046] In some feasible configurations, the end of the DC busbar furthest from the DC terminal penetrates the bottom wall of the second insulation chamber along the height of the cabinet.

[0047] In this feasible configuration, the DC busbar penetrates the bottom wall of the second insulation chamber. The cable connecting the DC power source to the DC busbar can enter the cabinet from the bottom wall and connect to the end of the DC busbar located outside the second insulation chamber. This eliminates the need for through holes for cable routing terminals on the side and top walls of the cabinet. Compared to the side and top walls, which are less exposed to external environments such as rain and dust, cable routing terminals on the bottom wall provide better protection for electrical components inside the cabinet, such as inverters and AC busbars. Furthermore, the cable routing terminals are sealed to the bottom wall and the input cable, allowing the input cable to exit through the terminals to the outside of the cabinet, ensuring the cabinet's airtightness.

[0048] In some feasible implementations, the converter integrated cabinet includes multiple DC busbars and two rows of converters. Each row of converters includes multiple converters arranged side by side, with the arrangement direction of the multiple converters in each row perpendicular to the arrangement direction of the two rows of converters. The backplates of one row of converters are arranged facing each other with a gap. A second heat insulation chamber is disposed within the gap. The two sidewalls of the second heat insulation chamber facing the two rows of converters are provided with multiple third openings. The DC terminals of each converter pass through one of the third openings and are connected to a DC busbar.

[0049] In this feasible method, since cables are typically laid between the two rows of converters, placing the second heat insulation chamber in the gap between the two rows of converters further utilizes this gap, increasing the power density of the converter integrated cabinet. With both the first and second heat insulation chambers positioned between the two rows of converters, and both AC and DC terminals located on the backplate of the converters, the converters only need to move towards the second heat insulation chamber along the arrangement direction of the two rows of converters to achieve connection between the converters and the AC and DC busbars. In some feasible configurations, one of the converter and the cabinet is provided with a positioning pin, and the other of the converter and the cabinet is provided with a positioning hole, into which the positioning pin is inserted.

[0050] In this feasible method, when the converter is connected to the AC bus and the DC bus, the hole wall of the positioning hole can guide the movement direction of the converter relative to the cabinet, so that the AC terminal can be aligned with the first opening and the DC terminal can be aligned with the third opening, which facilitates the connection of the converter to the AC bus and the DC bus.

[0051] In some feasible implementations, the converter integrated cabinet includes a liquid-cooled unit, the converter includes a liquid-cooled plate, and the front plate is provided with a liquid inlet and a liquid outlet; both the liquid inlet and the liquid outlet are used to connect to the liquid-cooled unit, and both the liquid inlet and the liquid outlet are also used to connect to the liquid-cooled plate.

[0052] In this feasible method, the liquid cooling plate in the liquid cooling unit and the converter is connected through the liquid inlet and liquid outlet ports set on the front plate of the converter. The coolant in the liquid cooling plate absorbs the heat generated by the converter during operation. The coolant in the liquid cooling plate can enter the liquid cooling unit through the liquid outlet port. After the coolant is cooled in the liquid cooling unit, it re-enters the liquid cooling plate through the liquid inlet port.

[0053] Furthermore, by placing the liquid inlet and outlet ports at the top of the front panel, the distance between the liquid cooler unit and the liquid inlet port, as well as between the liquid cooler unit and the liquid outlet port, is closer. This allows the liquid cooler unit to be connected to the converter's liquid inlet and outlet ports via shorter piping.

[0054] Secondly, embodiments of this application provide an energy storage system, which includes an energy storage cabinet and the aforementioned converter integrated cabinet; the DC source is the energy storage cabinet, and the energy storage cabinet is connected to multiple DC terminals.

[0055] The energy storage system based on the embodiments of this application has the same technical effects as the converter integrated cabinet provided in the foregoing embodiments due to the presence of the aforementioned converter integrated cabinet, which will not be repeated here.

[0056] In some feasible implementations, there are multiple converter integrated cabinets, and the energy storage system includes a busbar. Both ends of the busbar are connected to connection terminals. One connection terminal is connected to the AC busbar in one converter integrated cabinet, and the other connection terminal is connected to the AC busbar in another converter integrated cabinet.

[0057] In this feasible method, the AC busbar of the converter integrated cabinet is connected through a busbar with connection terminals. The connection terminals and the AC busbar are easy to connect. When the converter integrated cabinet is installed on site, the placement position of the converter integrated cabinet will be within the allowable error range. The busbar can be bent arbitrarily, so that the busbar can adapt to two converter integrated cabinets with different spacing. Attached Figure Description

[0058] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0059] Figure 1 A schematic diagram illustrating the connection between a photovoltaic power station and a power grid is provided as an embodiment of this application. Figure 2 A schematic diagram illustrating the connection between an energy storage cabinet and a converter integrated cabinet, provided for an embodiment of this application; Figure 3 Another connection diagram of the energy storage cabinet and the converter integrated cabinet provided in this application embodiment; Figure 4 A schematic diagram of the structure of a converter integrated cabinet provided in an embodiment of this application; Figure 5 A schematic diagram of a converter structure provided in an embodiment of this application; Figure 6 This is a schematic diagram of another converter structure provided in an embodiment of this application; Figure 7 This is a schematic diagram of another converter structure provided in an embodiment of this application; Figure 8 A schematic diagram showing the connection of a first heat insulation chamber, an AC busbar, and a converter provided in an embodiment of this application; Figure 9A schematic diagram showing another connection of the first heat insulation chamber, AC busbar, and converter provided for an embodiment of this application; Figure 10 for Figure 8 Schematic diagram of the connection between the medium converter and the AC busbar; Figure 11 for Figure 9 A schematic diagram of the structure of the first heat insulation chamber after removing the two end plates; Figure 12 for Figure 11 A schematic diagram showing the connection of the medium converter, branch bus assembly, and AC busbar; Figure 13 A schematic diagram of another converter integrated cabinet provided in this application embodiment; Figure 14 A schematic diagram of the structure of a second heat insulation chamber and a DC bus provided in an embodiment of this application; Figure 15 for Figure 14 The side view of the second heat insulation chamber and the DC conductive bus shown; Figure 16 A schematic diagram of the connection between a positioning beam and a converter is provided in an embodiment of this application; Figure 17 This is a schematic diagram showing the connection between a converter and a liquid-cooled unit, provided as an embodiment of this application.

[0060] Explanation of reference numerals in the attached figures: 100. Energy storage cabinet; 200. Converter integrated cabinet; 300. Photovoltaic module; 400. Inverter; 500. Transformer; 600. Power grid; 10. Cabinet; 12. Heat exchanger; 13. Positioning beam; 131. Positioning hole; 20. Converter; 21. Backplate; 22. AC terminal; 221. Notch; 23. Front panel; 24. DC terminal; 25. Liquid inlet; 26. Liquid outlet; 27. Bottom wall of converter; 271. Lower edge; 28. Top wall of converter; 29. ​​Positioning pin; 30. First heat insulation chamber; 31. First opening; 32. First seal; 33. Second opening; 34. Second seal; 40. AC busbar; 41. First bump; 50. Support assembly; 51. First support; 511. Second protrusion; 52. Second support; 60. Second heat insulation chamber; 61. Third opening; 62. Third seal; 63. Fourth opening; 64. Fourth seal; 70. DC bus; 80. Liquid-cooled chiller unit; 90. Piping assembly; 91. First main pipeline; 92. Second main pipeline; 93. First branch pipeline; 94. Second branch pipeline. Detailed Implementation

[0061] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0062] In this specification, the terms "vertical" and "parallel" are explained.

[0063] Perpendicularity: The perpendicularity defined in this application is not limited to an absolute perpendicular intersection (with an included angle of 90 degrees). It is permissible for non-absolute perpendicular intersections caused by factors such as assembly tolerances, design tolerances, and structural flatness. It is permissible for errors within a small angular range, such as an assembly error range of 80 to 100 degrees, which can all be understood as a perpendicular relationship.

[0064] Parallelism: The parallelism defined in this application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism, allowing for situations where there is no absolute parallelism due to factors such as assembly tolerances, design tolerances, and structural flatness. These situations where there is no absolute parallelism are also defined as parallelism in this application.

[0065] The following section will first explain some of the terms used in the embodiments of this application.

[0066] Joule heating refers to the heat released when electrical energy is converted into internal energy (heat energy) when an electric current passes through a conductor, due to the conductor's resistance. This is the core physical phenomenon described by Joule's law.

[0067] Power density refers to the amount of power that can be processed or output per unit volume or unit area. It is a key performance indicator for measuring the space utilization efficiency of a system, device, or material. Power density is directly related to the miniaturization, weight reduction, and performance improvement of equipment.

[0068] Integration level refers to the degree to which multiple independent subsystems and components are highly integrated, uniformly designed and optimized in terms of physical structure, electrical connection and software control. The higher the integration level, the lower the cost, the higher the efficiency, the more reliable and easier to deploy the system or equipment.

[0069] Energy storage systems are used to store and output electrical energy. They can be applied in areas such as site energy, commercial and industrial energy storage, and power plant energy storage. For example, Figure 1 This application provides a schematic diagram of the connection between a photovoltaic power station and a power grid 600; the following is in conjunction with... Figure 1 The functions of the energy storage system when applied to industrial and commercial energy storage and power plant energy storage are explained.

[0070] A photovoltaic power station comprises an energy storage system and a photovoltaic system. The photovoltaic system includes photovoltaic modules 300 and an inverter 400. The photovoltaic modules 300 convert solar energy into direct current (DC). The inverter 400 converts the DC power generated by the photovoltaic modules 300 into alternating current (AC) and supplies it to a transformer 500 and / or the energy storage system. The transformer 500 boosts the AC power input to itself before connecting it to the grid. The inverter 400 includes a DC / AC conversion circuit, and the transformer 500 includes an AC / AC conversion circuit.

[0071] The energy storage system includes an energy storage cabinet 100 and a converter integrated cabinet 200. The energy storage cabinet 100 serves as a DC source for storing or releasing electrical energy. When the energy storage cabinet 100 outputs electrical energy, the converter integrated cabinet 200 converts the DC output from the energy storage cabinet 100 into AC and supplies it to the transformer 500. After the transformer 500 steps up the voltage, the AC is supplied to the power grid 600. When the energy storage cabinet 100 stores electrical energy, the converter integrated cabinet 200 inverts the AC output from the inverter 400 or the power grid 600 into DC and supplies it to the energy storage cabinet 100. Therefore, the converter integrated cabinet 200 includes a DC / AC bidirectional conversion circuit.

[0072] In order for the energy storage cabinet 100 to store or output electrical energy, the energy storage cabinet 100 is equipped with multiple battery packs for storing electrical energy. The multiple battery packs can form multiple battery clusters. The process of charging and discharging the battery packs is the process of the energy storage cabinet 100 storing and outputting electrical energy.

[0073] In this embodiment of the application, the number of energy storage cabinets 100 and converter integrated cabinets 200 in the energy storage system is not limited, and the number of energy storage cabinets 100 and converter integrated cabinets 200 can be arbitrarily set; for example... Figure 2 A connection diagram of an energy storage cabinet 100 and a converter integrated cabinet 200 provided for an embodiment of this application; Figure 3 A connection diagram of an energy storage cabinet 100 and a converter integrated cabinet 200 provided in this application embodiment; as shown Figure 2 or Figure 3As shown, in some examples, there can be multiple converter integrated cabinets 200, and one converter integrated cabinet 200 can connect to multiple energy storage cabinets 100. Of course, one converter integrated cabinet 200 can connect to one energy storage cabinet 100.

[0074] like Figure 2 As shown, the output terminals of multiple converter integrated cabinets 200 are connected in series to a transformer 300, meaning that the AC power output from multiple converter integrated cabinets 200 is collected and connected to the grid.

[0075] like Figure 3 As shown, the multiple converter integrated cabinets 200 include two sets of converter integrated cabinets 200 connected in parallel. Each set of converter integrated cabinets 200 may include one or more converter integrated cabinets 200 connected in series. The output terminals of both sets of converter integrated cabinets 200 are connected to transformers 300. That is, the two sets of converter integrated cabinets 200 are connected in parallel, so the voltage of the input transformer 200 increases.

[0076] As can be seen from the above introduction to photovoltaic power plants, the converter integrated cabinet 200 is the core equipment in the energy storage system. The converter integrated cabinet 200 is used to convert the DC power input to the energy storage cabinet 100 into AC power and output it, or to convert the AC power input to the energy storage cabinet 100 into DC power and output it. However, in related technologies, the converter integrated cabinet 200 includes a cabinet 10, a converter 20 installed inside the cabinet 10, and a busbar for transmitting current. When transmitting current, the busbar generates a significant amount of heat due to its resistance. This heat is dissipated into the cabinet 10, causing the temperature of other electrical components inside the cabinet 10 to rise, thus affecting the operation of other electrical equipment within the converter integrated cabinet 200.

[0077] Figure 4 This is a structural schematic diagram of a converter integrated cabinet 200 provided for an embodiment of this application. For ease of illustration, Figure 4 Part of the side panel of cabinet 10 was concealed. It should be noted that... Figure 4 The converter integrated cabinet 200 shown is only a schematic structure and does not represent the actual structure of the product.

[0078] Therefore, this application provides an embodiment as follows: Figure 4 The converter integrated cabinet 200 shown includes a cabinet 10 and a first heat insulation chamber 30, an AC busbar 40 and a converter 20 disposed within the cabinet 10.

[0079] The AC busbar 40 serves as the output terminal of the converter integrated cabinet 200. The AC busbar 40 is used to transmit AC power into or out of the converter 20. The AC busbar 40 is located inside the first heat insulation chamber 30, and at least one end of the AC busbar 40 extends through the wall of the first heat insulation chamber 30 to the outside of the first heat insulation chamber 30.

[0080] According to Joule's law, Q=I 2 Rt and Q represent the heat generated; I represents the current flowing through the conductor; R represents the resistance of the conductor; and t represents the energizing time. When the AC bus 40 transmits AC power, it will inevitably generate heat. Since the current flowing through the AC bus 40 is large, and the Joule heat Q is proportional to the square of the current I, the AC bus 40 in the converter integrated cabinet 200 will generate a great deal of heat when transmitting AC power. In this application, after the AC bus 40 is placed inside the first heat insulation chamber 30, the heat generated by the AC bus 40 when transmitting AC power will be isolated inside the first heat insulation chamber 30, reducing the impact of the heat dissipated by the AC bus 40 when transmitting AC power on the converter 20.

[0081] To enhance the heat insulation effect of the first heat insulation chamber 30, in some examples, the first heat insulation chamber 30 is made of heat insulation material, such as fiberglass, asbestos, rock wool, silicate aerogel felt, or vacuum board. Simultaneously, to enhance the safety performance of the converter integrated cabinet 200, in some examples, the first heat insulation chamber 30 can be made of insulating heat insulation material. This prevents the AC busbar 40 located inside the first heat insulation chamber 30 from cross-current with the first heat insulation chamber 30 or electrical equipment located outside the first heat insulation chamber 30, thus improving the safety performance of the converter integrated cabinet 200.

[0082] The AC bus 40 dissipates heat, naturally causing its temperature to rise. To reduce the temperature of the AC bus 40, such as... Figure 4 As shown, in some examples, the converter integrated cabinet 200 includes a heat exchanger 12 disposed in the cabinet 10. The heat exchanger 12 is connected to the first heat insulation chamber 30. In this way, the heat exchanger 12 absorbs the temperature in the first heat insulation chamber 30 and dissipates it into the cabinet 10, thereby reducing the temperature of the AC busbar 40.

[0083] The heat exchanger 12 in this embodiment may include a housing and a fan rotatably disposed inside the housing. The housing is connected to the first heat insulation chamber 30, and the fan draws hot air from the first heat insulation chamber 30 into the housing and discharges it.

[0084] In this embodiment, the position of the heat exchanger 12 within the cabinet 10 is not limited, as long as the heat exchanger 12 can reduce the temperature inside the first insulation chamber 30. Figure 4 As shown, in some examples, the heat exchanger 12 is located on the bottom wall of the cabinet 10.

[0085] In this embodiment, the connection method between the heat exchanger 12 and the first insulation chamber 30 is not limited. In some examples, the heat exchanger 12 can be connected to the first insulation chamber 30 via a pipe. For example, if the heat exchanger 12 and the first insulation chamber 30 are far apart, the pipe can extend inside the cabinet 10 to connect the heat exchanger 12 and the first insulation chamber 30, allowing for more flexible placement of the heat exchanger 12. In other examples, the shell of the heat exchanger 12 can be directly connected to the first insulation chamber 30. For example, if the heat exchanger 12 and the first insulation chamber 30 are adjacent, directly connecting the shell of the heat exchanger 12 to the first insulation chamber 30 shortens the path for the hot air in the first insulation chamber 30 to reach the heat exchanger 12, resulting in higher cooling efficiency of the heat exchanger 12 for the AC busbar 40.

[0086] Figure 5 , Figure 6 and Figure 7 These are all schematic diagrams of the structure of a converter 20 provided in the embodiments of this application; the following are combined with Figure 5 , Figure 6 and Figure 7 The converter 20 in the embodiment of this application will be described. Figure 5 , Figure 6 and Figure 7 The position of the DC terminal 24 is different.

[0087] The converter 20 is used to convert electrical energy into its form. Combined with the aforementioned converter integrated cabinet 200, it includes a DC / AC bidirectional conversion circuit, such as... Figure 5 , Figure 6 or Figure 7 As shown, in some examples, the converter 20 includes a power conversion circuit, a DC terminal 24, and an AC terminal 22. The DC terminal 24 is used to connect a DC source to the DC terminal of the power conversion circuit, which is used to realize bidirectional power conversion between DC and AC. The AC terminal 22 is used to connect the AC terminal of the power conversion circuit to the AC bus 40. In this application, the DC source can be... Figure 2 The energy storage cabinet 100 in the energy storage system shown.

[0088] In this embodiment, the AC terminal 22 can be located on any side of the converter 20, and is not limited to this side. Figure 5 , Figure 6 or Figure 7 The AC terminal 22 is shown to be mounted on the backplate 21 of the converter 20; for example, the AC terminal 22 can be mounted on... Figure 5 , Figure 6 or Figure 7 The front plate 23, bottom wall 27, or top wall 28 of the converter 20 shown.

[0089] It is understandable that, in order to facilitate the connection between AC terminal 22 and AC bus 40, AC terminal 22 and AC bus 40 may be located on the same side of converter 20.

[0090] DC terminal 24 is used to connect to a DC source, for example, to the output terminal of energy storage cabinet 100 via a cable. This cable can be the output cable of energy storage cabinet 100 or a cable of the converter integrated cabinet 200 itself, and is connected to the output terminal of energy storage cabinet 100. In this embodiment, DC terminal 24 can also be located on either side of converter 20; for example, DC terminal 24 can be located on... Figure 5 , Figure 6 or Figure 7 The converter 20 is shown with its front plate 23, bottom wall 27, or top wall 28. The following are several locations of the DC terminals 24 on the converter 20: like Figure 5 As shown, in one example, the front plate 23 of each converter 20 is disposed opposite to the back plate 21, and the DC terminal 24 is disposed on the front plate 23.

[0091] Since the front panel 23 and the back panel 21 of each converter 20 are arranged opposite each other, and the DC terminal 24 is arranged on the front panel 23, the DC terminal 24 and the AC terminal 22 on the same converter 20 are located on two opposite sides of the converter 20. In this way, the input cable connected to the DC terminal 24 and the AC busbar 40 connected to the AC terminal 22 are located on opposite sides of the converter 20. The input cable for inputting DC power and the AC busbar 40 for outputting AC power do not interfere with each other, and the partitioning of the input cable and the AC busbar 40 inside the converter integrated cabinet 200 is obvious.

[0092] like Figure 6 As shown, in the third example, the DC terminal 24 is disposed on the back plate 21.

[0093] Both DC terminals 24 and AC terminals 22 are located on the back plate 21 of the converter 20. Cables and AC busbars 40 are also centrally located on the back plate 21 of the converter 20, which improves the power density of the converter integrated cabinet 200.

[0094] Furthermore, the converter 20 is usually connected to the liquid cooling unit on the front panel 23, and both the DC terminal 24 and the AC terminal 22 are located on the back panel 21. If a leak occurs at the connection between the converter 20 and the liquid cooling unit, the coolant will flow down along the front panel 23 of the converter 20, reducing the risk of coolant flowing into the DC terminal 24 and the AC terminal 22 and improving the safety performance of the converter integrated cabinet 200.

[0095] like Figure 7As shown, in the third example, the front panel 23 of the converter 20 has a lower edge 271 protruding from the bottom wall of the converter 20 in the height direction of the cabinet 10, and the DC terminal 24 is located on the side of the lower edge 271 facing the back panel 21 of another row of converters 20. When the bottom wall 27 of the converter 20 has a protruding lower edge 271, the DC terminal 24 is located on the side of the lower edge 271 facing the other row of converters 20. At this time, although the input cable connected to the DC terminal 24 and the AC bus 40 connected to the AC terminal 22 are not located on opposite sides of the converter 20, the input cable and the AC bus 40 are still misaligned in the arrangement direction of the front plate 23 and the rear plate of the converter 20. The input cable for inputting DC power and the AC bus 40 for outputting AC power do not interfere with each other. Furthermore, if the coolant in the converter 20 leaks, the coolant will flow down along the side wall of the converter 20. However, since the DC terminal 24 is located on the lower edge 271, the risk of coolant flowing into the DC terminal 24 is reduced, improving the safety performance of the converter integrated cabinet 200.

[0096] Figure 8 A schematic diagram showing the connection of a first heat insulation chamber 30, an AC busbar 40, and a converter 20 provided for an embodiment of this application; Figure 9 A schematic diagram showing the connection of another first heat insulation chamber 30, AC busbar 40 and converter 20 provided for an embodiment of this application; Figure 8 and Figure 9 The image shows two different structures of the first heat insulation chamber 30, and... Figure 8 and Figure 9 Only a portion of the converter 20 is shown in the diagram; the remaining converters 20, not shown, can... Figure 8 and Figure 9 The converter 20 shown is arranged in a duplicate along the length of the first heat insulation chamber 30.

[0097] The AC bus 40 is installed inside the first insulation chamber 30, but the AC terminal 22 must be connected to the AC bus 40 so that the AC power output from the converter 20 is transmitted to the AC bus 40, or the AC power output from other electrical equipment is input to the converter 20 through the AC bus 40. Therefore, as... Figure 8 or Figure 9 As shown, in some examples, the first heat insulation chamber 30 is provided with a first opening 31, through which the AC terminal 22 passes and is connected to the AC bus 40. In this way, the AC terminal 22 can be inserted into the first heat insulation chamber 30 through the first opening 31 to realize the connection between the AC terminal 22 and the AC bus 40.

[0098] To facilitate the insertion of the AC terminal 22 into the first heat insulation chamber 30, such as Figure 8 or Figure 9As shown, in some examples, the side of the first heat insulation chamber 30 with the first opening 31 and the side of the converter 20 with the AC terminal 22 are arranged facing each other. Along the arrangement direction of the side of the first heat insulation chamber 30 with the first opening 31 and the side of the converter 20 with the AC terminal 22, the orthographic projection of the AC terminal 22 on the first heat insulation chamber 30 is within the outline of the first opening 31.

[0099] When assembling the converter 20 and the first heat insulation chamber 30, the converter 20 only needs to be moved toward the first heat insulation chamber 30 along the arrangement direction of the side of the first heat insulation chamber 30 where the first opening 31 is provided and the side of the converter 20 where the AC terminal 22 is provided, and the AC terminal 22 can be inserted into the first opening 31.

[0100] To improve the sealing performance of the first heat insulation chamber 30, such as Figure 8 or Figure 9 As shown, in some examples, along the arrangement direction of the first opening 31 on the side of the first heat insulation chamber 30 and the AC terminal 22 on the side of the converter 20, the first heat insulation chamber 30 extends toward the converter 20 on the side where the first opening 31 is provided and is provided with a first seal 32, which surrounds the periphery of the AC terminal 22.

[0101] Understandably, in other examples, the first opening 31 is provided on the side of the first insulation chamber 30 and the AC terminal 22 is provided on the side of the converter 20. The converter 20 is provided with a first seal 32 extending towards the first insulation chamber 30 on the side where the AC terminal 22 is provided. The first seal 32 surrounds the periphery of the AC terminal 22.

[0102] In the two examples above, after the AC terminal 22 is inserted into the first opening 31, the first seal 32 surrounds the AC terminal 22, sealing the AC terminal 22 and the first opening 31, reducing the risk of heat in the first heat insulation chamber 30 leaking from the first opening 31 into the cabinet 10.

[0103] exist Figure 8 and Figure 9 The arrangement direction of the side of the first heat insulation chamber 30 with the first opening 31 and the side of the converter 20 with the AC terminal 22 is the depth direction of the cabinet 10. However, it can be understood that the arrangement direction of the side of the first heat insulation chamber 30 with the first opening 31 and the side of the converter 20 with the AC terminal 22 can also be the length direction of the cabinet 10.

[0104] It is understandable that the AC bus 40 needs to be connected not only to the AC terminal 22, but also to external electrical equipment. Therefore, in some examples, at least one end of the AC bus 40 extends through the wall of the first insulation chamber 30 and out of the first insulation chamber 30. The end of the AC bus 40 located outside the first insulation chamber 30 can be used to connect to external electrical equipment.

[0105] In some examples, one end of the AC bus 40 extends to the outside of the first heat insulation chamber 30. In this case, the end of the AC bus 40 outside the first heat insulation chamber 30 can be connected to, for example, the inverter 400 in the photovoltaic power station described above.

[0106] In other examples, both ends of the AC busbar 40 extend beyond the outer side of the first insulation chamber 30. In this case, the AC buses 40 of multiple converter integrated cabinets 200 can be connected in series to form... Figure 2 The output terminals of the multiple converter integrated cabinets 200 shown are connected in series.

[0107] To facilitate the extension of the end of the AC busbar 40 into the first heat insulation chamber 30, such as Figure 8 or Figure 9 As shown, in some examples, the first insulation chamber 30 is provided with a second opening 33, through which one end of the AC bus 40 extends to the outside of the first insulation chamber 30. In this way, the end of the AC bus 40 extends to the outside of the first insulation chamber 30 through the second opening 33, which facilitates the connection of the AC bus 40 to external electrical equipment.

[0108] To reduce the risk of heat leakage from the first heat insulation chamber 30 to the outside of the first heat insulation chamber 30 through the gap between the second opening 33 and the AC conductive bus 40, such as Figure 8 or Figure 9 As shown, in some examples, a second seal 34 extends from the side of the first heat insulation chamber 30 away from the side with the second opening 33, and surrounds the periphery of the AC busbar 40. After the second seal 34 surrounds the AC busbar 40, it seals the gap between the AC busbar 40 and the second opening 33, reducing the risk of heat leakage from the first heat insulation chamber 30 into the cabinet 10 through the second opening 33.

[0109] To facilitate the connection of the AC bus 40 to other electrical equipment, in some examples, multiple connection through holes are provided at both ends of the AC bus 40.

[0110] When the converter integrated cabinet 200 is connected to external electrical equipment, the connection through hole at the end of the AC bus 40 facilitates the connection between the AC bus 40 and the external electrical equipment. For example, if the AC bus 40 is directly connected to an external cable, the connection through hole can be used for the external cable to pass through; or if the AC bus 40 is connected to an external cable through a terminal block, the connection through hole can be used for the bolts of the terminal block to pass through.

[0111] It is understood that the number of converters 20 within the converter integrated cabinet 200 can be multiple. To improve the integration and power density of the converter integrated cabinet 200, this application specifies the arrangement of multiple converters 20 within the cabinet 10, for example, as described below... Figure 8 and Figure 9 Two arrangements of converter 20 are given: like Figure 8 As shown, in the first arrangement, multiple converters 20 are arranged side by side in a row, and the multiple converters 20 have AC terminals 22 on the same side. For example, the multiple converters 20 all have AC terminals 22 on the back plate 21; or, the multiple converters 20 all have AC terminals 22 on the front plate 23; or, the multiple converters 20 all have AC terminals 22 on the bottom wall.

[0112] Each converter 20 is equipped with an AC terminal 22, corresponding to, for example Figure 8 As shown, the first heat insulation chamber 30 is provided with multiple first openings 31, and the AC terminal 22 of each converter 20 passes through one opening and is connected to the AC bus 40.

[0113] In order to make the first heat insulation chamber have a side facing the side of the converter where the AC terminals are located, in some examples, the first heat insulation chamber 30 is at least partially located on the same side of the converter 20 as the AC terminals 22.

[0114] For example, if multiple converters 20 all have their AC terminals 22 located on the back plate 21, then the first heat insulation chamber 30 can be completely located on the back side of the converter 20; or, the first heat insulation chamber 30 can be partially located on the back side of the converter 20, with the remaining portion located on the lower side of the converter 20. As another example, if multiple converters 20 all have their AC terminals 22 located on the bottom wall, then the first heat insulation chamber 30 can be completely located on the lower side of the converter 20; or, the first heat insulation chamber 30 can be partially located on the lower side of the converter 20, with the remaining portion located on the back side of the converter 20.

[0115] like Figure 9 As shown, in the second arrangement, multiple converters 20 are arranged in two rows of converters 20. Each row of converters 20 includes multiple converters 20, and the arrangement direction of the multiple converters 20 in each row is perpendicular to the arrangement direction of the two rows of converters 20.

[0116] In some examples, multiple converters 20 have AC terminals 22 located on the bottom wall, and a first heat insulation chamber 30 is located below the two rows of converters 20. The top wall of the first heat insulation chamber 30 has two rows of first openings 31, each row of first openings 31 including multiple spaced first openings 31. The AC terminal 22 of each converter 20 passes through a first opening 31 and is connected to an AC bus 40.

[0117] like Figure 9 As shown, in some other examples, the backplate 21 of one row of converters 20 is arranged facing the backplate 21 of the other row of converters 20 with a gap. The first heat insulation chamber 30 is at least partially disposed within the gap. Along the arrangement direction of the two rows of converters 20, the portion of the first heat insulation chamber 30 within the gap has multiple first openings 31 on both sidewalls of the two rows of converters 20. The converters 20 have AC terminals 22 on the backplate 21. Each AC terminal 22 of the converter 20 passes through a first opening 31 and is connected to an AC busbar 40.

[0118] The converter integrated cabinet 200 is equipped with two rows of converters 20. The first heat insulation chamber 30 is placed in the gap between the two rows of converters 20, and the AC terminals 22 are placed on the back plate 21 of the converters 20. The first heat insulation chamber 30 has multiple first openings 31 on both side walls of the back plate 21 facing the two rows of converters 20. The AC terminals 22 of each converter 20 pass through a first opening 31 and are connected to the AC busbar 40. Thus, the two rows of converters 20 can share a first heat insulation chamber 30, which not only reduces the heat transferred from the AC busbar 40 to other electrical components, but also simplifies the structure of the converter integrated cabinet 200.

[0119] In order to enable the AC bus 40 to connect to the AC terminals 22 of multiple converters 20 at the same time, in the above two arrangement methods, the first heat insulation chamber 30 and the AC bus 40 disposed in the first heat insulation chamber 30 both extend along the arrangement direction of the multiple converters 20, and the multiple first openings 31 disposed on the first heat insulation chamber 30 are arranged at intervals along the arrangement direction of the multiple converters 20.

[0120] It is understandable that when the converter integrated cabinet 200 includes multiple converters 20, the extension direction of the first heat insulation chamber 30 is parallel to the arrangement direction of the multiple converters 20 within each row of converters 20.

[0121] Since the AC busbar 40, as the output terminal of the converter integrated cabinet 200, needs to output three-phase AC power, such as Figure 8As shown, in some examples, the converter integrated cabinet 200 includes a set of AC busbars 40, each set of AC busbars 40 including three AC busbars 40 arranged side by side, and all AC terminals 22 of all converters 20 are connected to the three AC busbars 40. That is, regardless of whether the multiple converters 20 are arranged in one row or two rows, all AC terminals 22 of all converters 20 are connected to the three AC busbars 40.

[0122] The converter integrated cabinet 200 has only one set of AC busbars 40. Since the two rows of converters 20 are arranged in two rows, the two rows of converters 20 share one set of AC busbars 40, which improves the power density and integration of the converter integrated cabinet 200.

[0123] like Figure 9 As shown, in some other examples, the converter integrated cabinet 200 includes two sets of AC busbars 40, which are arranged side-by-side along the arrangement direction of the two rows of converters 20. Each set of AC busbars 40 includes three AC busbars 40. Multiple AC terminals 22 of one row of converters 20 are connected to the three AC busbars 40 in the corresponding set of AC busbars 40. In this case, one row of converters 20 is connected to three AC busbars 40 in one of the two sets of AC busbars 40.

[0124] Each group of AC busbars 40 corresponds to one row of converters 20. That is, multiple converters 20 within a row of converters 20 are connected to their corresponding groups of AC busbars 40. This reduces the AC current transmitted by each group of AC busbars 40. According to Q=I²Rt, a halving of the current results in a quaternary reduction in heat generation. Therefore, the heat generated by the same current being shunted between two groups of AC busbars 40 is reduced. For example, if the AC current output from the two rows of converters 20 is 4A, according to Q=I²Rt, when there is only one group of AC busbars 40, Q=16Rt; when there are two groups of AC busbars 40, each group only needs to transmit 2A of AC current. Therefore, the heat generated by each AC busbar 40 transmitting AC current is Q=4Rt, and the total heat generated by the two groups of AC busbars 40 is 8Rt. This demonstrates a significant reduction in the heat generated by the AC busbars 40. Here, A is the unit of current, ampere.

[0125] In this embodiment, the arrangement direction of the three AC busbars 40 within each group of AC busbars 40 is not limited, and the three AC busbars 40 within each group of AC busbars 40 can be arranged as follows: Figure 8 The three AC busbars 40 shown in the diagram are arranged along the height of the cabinet 10; alternatively... Figure 9 The three AC busbars 40 in the set shown are arranged along the depth direction of the cabinet 10.

[0126] Figure 10 for Figure 8 A schematic diagram showing the connection between the intermediate frequency converter 20 and the AC bus 40; Figure 11 for Figure 9 A schematic diagram of the structure of the first heat insulation chamber after removing the two end plates.

[0127] It is understood that the AC terminal 22, which extends into the first opening 31, needs to be connected to the AC busbar 40. To facilitate the connection between the AC terminal 22 and the AC busbar 40 disposed in the first heat insulation chamber 30, the embodiments of this application provide the following two possible methods: In the first feasible approach, the AC terminal 22 passes through the first opening 31 and is directly connected to the AC bus 40.

[0128] To enable AC terminal 22 to be directly connected to AC bus 40, such as Figure 8 and Figure 10 As shown, in some examples, the arrangement direction of the AC terminal 22 on the side of the converter 20 and the first opening 31 on the side of the first heat insulation chamber 30 is such that the first opening 31 and the AC bus 40 partially overlap. With the AC terminal 22 positioned within the outline of the first opening 31, when the first opening 31 and the AC bus 40 partially overlap, the AC terminal 22, after extending into the first heat insulation chamber 30, can contact the overlapping portion of the AC bus 40 and the first opening 31, thus achieving a direct connection between the AC terminal 22 and the AC bus 40.

[0129] To facilitate the connection between AC terminal 22 and AC bus 40, such as Figure 8 and Figure 10 As shown, in some examples, along the arrangement direction of the side of the converter 20 where the AC terminal 22 is provided and the side of the first heat insulation chamber 30 where the first opening 31 is provided, the AC terminal 22 has a notch 221 on the side away from the converter 20, and the AC busbar 40 has a protrusion 41 facing the AC terminal 22. In this application, this protrusion is referred to as the first protrusion 41, and the first protrusion 41 is inserted into the notch 221.

[0130] like Figure 11 As shown, in the second feasible method, a support assembly 50 is provided inside the first heat insulation chamber 30. The support assembly 50 is disposed inside the first heat insulation chamber 30 and fixed to the inner wall of the first heat insulation chamber 30. The support assembly 50 is connected to the AC terminal 22 and the AC busbar 40.

[0131] That is, AC terminal 22 and AC bus 40 are indirectly connected through branch assembly 50. The AC power input from converter 20 is transmitted to AC bus 40 through branch assembly 50. The branch assembly 50 is placed in the first heat insulation chamber 30. The heat generated by the branch assembly 50 when transmitting AC power is also isolated in the first heat insulation chamber 30.

[0132] Figure 12 for Figure 11 A connection diagram of the intermediate frequency converter 20, the branch bus assembly 50, and the AC busbar 40; as shown. Figure 12 As shown, in some examples, the support assembly 50 includes a first support 51 and a second support 52. The first support 51 is fixed to the inner wall of the first heat insulation chamber 30 and is connected to the AC terminal 22. One end of the second support 52 is connected to the first support 51, and the other end of the second support 52 is connected to the AC busbar 40.

[0133] The current output from AC terminal 22 is first transmitted to the first branch 51, then from the first branch 51 to the second branch 52, and finally to the AC bus 40. Depending on the different extension paths of the first branch 51 and the second branch 52, the AC bus 40 can be set at any position in the first heat insulation chamber 30, which makes it easier to set the AC bus 40 in a more reasonable position, such as in a position where the AC bus 40 can easily dissipate heat.

[0134] In some examples, the first row 51 and the second row 52 can be set up as a single unit.

[0135] It is understandable that if a branch assembly 50 is provided between one AC busbar 40 and AC terminal 22, then three branch assemblies 50 are provided between three AC busbars 40 and AC terminal 22.

[0136] In order to fix the first branch 51 to the inner wall of the first heat insulation chamber 30, in some examples, the inner wall of the first heat insulation chamber 30 is provided with two support plates. The two support plates are respectively located on both sides of the AC terminal 22. One end of the first branch 51 is connected to a support plate, and the other end of the first branch 51 is connected to the other support plate. Since the two support plates are respectively located on both sides of the AC terminal 22, the first branch 51 contacts the AC terminal 22 located between the two support plates.

[0137] To facilitate the connection between the first busbar 51 and the AC busbar 40, such as Figure 12 As shown, in some examples, the AC terminal 22 has a notch 221 on the side facing away from the converter 20, and the first branch 51 has a protrusion on the side facing the AC terminal 22. For distinction, this protrusion is referred to as the second protrusion 511 in this application. The second protrusion 511 is inserted into the notch 221.

[0138] Figure 13 A schematic diagram of another converter integrated cabinet 200 provided in this application embodiment; Figure 14 This is a schematic diagram of the structure of a second heat insulation chamber 60 and a DC conductive busbar 70 provided in an embodiment of this application.

[0139] like Figure 13 and Figure 14 As shown, in some examples, the converter integrated cabinet 200 includes a DC bus 70 for transmitting DC power into or out of the converter 20, i.e., the DC bus 70 connects the output terminal and the DC terminal 24 of the energy storage cabinet 100.

[0140] Similar to the principle of AC bus 40 transmitting AC power, DC bus 70 will inevitably generate heat when transmitting DC power. Therefore, in some examples, the converter integrated cabinet 200 includes a second heat insulation chamber 60; the DC bus 70 is disposed within the second heat insulation chamber 60. After the DC bus 70 is disposed within the second heat insulation chamber 60, the heat generated by the DC bus 70 when transmitting DC power will be isolated within the second heat insulation chamber 60, reducing the impact of the heat dissipated by the DC bus 70 when transmitting DC power on the converter 20.

[0141] Since DC terminal 24 needs to be connected to the second heat insulation chamber 60, such as Figure 14 As shown, in some examples, the second heat insulation chamber 60 is provided with a third opening 61 through which the DC terminal 24 passes and is connected to the DC bus 70.

[0142] To reduce heat leakage from the second insulation chamber 60 through the third opening 61, in some examples, a third seal 62 extends from the side of the second insulation chamber 60 with the third opening 61 toward the converter 20, and the third seal 62 surrounds the periphery of the DC terminal 24. Thus, after the DC terminal 24 is inserted into the third opening 61, the third seal 62 surrounds the periphery of the DC terminal 24, sealing the DC terminal 24 and the third opening 61, reducing the risk of heat leakage from the second insulation chamber 60 through the third opening 61 into the cabinet 10.

[0143] To facilitate the insertion of the DC terminal 24 into the third opening 61, in some examples, the DC terminal 24 is positioned within the outline of the third opening 61 along the arrangement direction of the side of the converter 20 where the DC terminal 24 is located and the side of the second heat insulation chamber 60 where the third opening 61 is located. Furthermore, to facilitate the connection between the DC terminal 24 and the DC bus 70, in some examples, the end of the DC bus 70 within the second heat insulation chamber 60 is positioned within the outline of the third opening 61 along the arrangement direction of the side of the converter 20 where the DC terminal 24 is located and the side of the second heat insulation chamber 60 where the third opening 61 is located. Thus, when the DC terminal 24 extends through the third opening 61 into the second heat insulation chamber 60, it can contact the DC bus 70.

[0144] To facilitate the assembly of the converter 20, the first heat insulation chamber 30, and the second heat insulation chamber 60, in some examples, the AC terminal 22 and the DC terminal 24 are located on the same side of the converter 20. The side of the first heat insulation chamber 30 with the first opening 31 and the side of the second heat insulation chamber 60 with the third opening 61 are located on the same side of the converter 20. Thus, by moving the converter 20 toward the first heat insulation chamber 30 and the second heat insulation chamber 60 along the arrangement direction of the side of the converter 20 with the DC terminal 24 and the side of the second heat insulation chamber 60 with the third opening 61, the AC terminal 22 can extend into the first heat insulation chamber 30 through the first opening 31, and the DC terminal 24 can extend into the second heat insulation chamber 60 through the third opening 61.

[0145] Since the DC bus 70 needs to be connected to external electrical equipment, in some examples, one end of the DC bus 70 extends through the wall of the second insulation chamber 60 to the outside of the second insulation chamber 60 to connect to a DC source.

[0146] To facilitate the extension of the end of the DC busbar 70 into the second heat insulation chamber 60, Figure 15 for Figure 14 The side view of the second heat insulation chamber 60 and the DC conductive busbar 70 is shown; Figure 15 As shown, in some examples, the second insulation chamber 60 is provided with a fourth opening 63, through which one end of the DC bus 70 extends to the outside of the second insulation chamber 60. In this way, the end of the DC bus 70 extends to the outside of the first insulation chamber 30 through the fourth opening 63, which facilitates the connection of the DC bus 70 to external electrical equipment.

[0147] To reduce the risk of heat leakage from the first insulation chamber 30 to the outside of the second insulation chamber 60 through the gap between the fourth opening 63 and the DC conductive bus 70, in some examples, a fourth seal 64 extends from the side of the second insulation chamber 60 where the fourth opening 63 is located, facing away from the second insulation chamber 60. The fourth seal 64 surrounds the periphery of the DC conductive bus 70. After the fourth seal 64 surrounds the DC conductive bus 70, it seals the gap between the DC conductive bus 70 and the fourth opening 63, reducing the risk of heat leakage from the second insulation chamber 60 to the cabinet 10 through the fourth opening 63.

[0148] In some examples, the DC terminal 24 passes through the third opening 61 and is connected to the end of the DC bus 70 located inside the second heat insulation chamber 60, so as to transmit the current output from the DC source to the converter 20, or to transmit the DC power output from the converter 20 to the DC source.

[0149] In some examples, along the height of the cabinet 10, the end of the DC busbar 70 away from the DC terminal 24 penetrates the bottom wall of the second heat insulation chamber 60.

[0150] The DC busbar 70 penetrates the bottom wall of the second heat insulation chamber 60. The cable used by the DC power source to connect to the DC busbar 70 can enter the cabinet 10 from the bottom wall and connect to the end of the DC busbar 70 located outside the second heat insulation chamber 60. This eliminates the need for through holes for mounting cable terminals on the side and top walls of the cabinet 10. Compared to the side and top walls of the cabinet 10, which are less exposed to the external environment (e.g., rainwater, dust), installing cable terminals on the bottom wall of the cabinet 10 better protects the electrical components inside the cabinet 10, such as the inverter 20 and the AC busbar 40. Furthermore, the cable terminals are sealed to the bottom wall of the cabinet 10 and to the input cable, which then exits through the cable terminals to the outside of the cabinet 10, ensuring the airtightness of the cabinet 10.

[0151] In some examples, one of the converter 20 and the cabinet 10 is provided with a positioning pin 29, and the other of the converter 20 and the cabinet 10 is provided with a positioning hole 131. The positioning pin 29 is inserted into the positioning hole 131, and the position of the converter 20 can be fixed by setting the positioning pin 29 in the positioning hole 131.

[0152] In some examples, the converter 20 is provided with a positioning pin 29 and the cabinet 10 is provided with a positioning hole 131. The positioning pin 29 of the converter 20 can ensure the integrity of the converter 20 housing, that is, ensure the sealing of the converter 20.

[0153] When the converter 20 is connected to the AC bus 40 and the DC bus 70, the wall of the positioning hole 131 can guide the movement direction of the converter 20 relative to the cabinet 10, so that the AC terminal 22 can be aligned with the first opening 31 and the DC terminal 24 can be aligned with the third opening 61, which facilitates the connection of the converter 20 to the AC bus 40 and the DC bus 70.

[0154] Figure 16 A schematic diagram illustrating the connection between the positioning beam 13 and the converter 20 provided in this application embodiment; as shown Figure 16 As shown, in some examples, cabinet 10 (refer to...) Figure 13 The converter 20 is equipped with a positioning beam 13, and a positioning hole 131 is provided on the positioning beam 13. The side of the positioning beam 13 with the positioning hole 131 and the side of the converter 20 with the positioning pin 29 are arranged facing each other.

[0155] When there are two rows of converters 20 and a gap is provided between the two rows of converters 20, the positioning beam 13 is set in the gap, and the two rows of converters 20 share a positioning beam 13. The two opposite sides of the positioning beam 13 face the two rows of converters 20 respectively.

[0156] Figure 17 This is a schematic diagram illustrating the connection between a converter 20 and a liquid-cooled unit 80, provided as an embodiment of this application. Figure 17 As shown, in some examples, the converter integrated cabinet 200 includes a liquid cooler unit 80, the converter 20 includes a liquid cooling plate, and the front plate 23 is provided with a liquid inlet interface 25 and a liquid outlet interface 26; both the liquid inlet interface 25 and the liquid outlet interface 26 are used to connect to the liquid cooler unit 80, and both the liquid inlet interface 25 and the liquid outlet interface 26 are also used to connect to the liquid cooling plate.

[0157] The liquid cooling plate in the liquid cooling unit 80 and the converter 20 is connected through the liquid inlet port 25 and the liquid outlet port 26 provided on the front plate 23 of the converter 20. The coolant in the liquid cooling plate absorbs the heat generated by the converter 20 during operation. The coolant in the liquid cooling plate can enter the liquid cooling unit 80 through the liquid outlet port 26. After the coolant is cooled in the liquid cooling unit 80, it re-enters the liquid cooling plate through the liquid inlet port 25.

[0158] In some examples, both AC terminal 22 and DC terminal 24 are located on the back plate 21 of the converter 20, and the liquid inlet 25 and liquid outlet 26 are located on the front plate 23. In this case, when the energy storage cabinet 100 of the converter 20 leaks at the liquid inlet 25 and liquid outlet 26, the coolant will flow downward on the front plate 23 of the converter 20 and will not affect the AC terminal 22 and DC terminal 24 located on the back plate 21 of the converter 20.

[0159] To achieve the connection between the liquid chiller 80 and the converter 20, such as Figure 17As shown, in some examples, the converter integrated cabinet 200 also includes a piping assembly 90, which includes a first main pipe 91, a second main pipe 92, a plurality of first branch pipes 93 and a plurality of second branch pipes 94. The first main pipe 91 and the second main pipe 92 are both connected to the liquid chiller unit 80. One end of a first branch pipe 93 is connected to the first main pipe 91 and the other end is connected to a converter 20. One end of a second branch pipe 94 is connected to the second main pipe 92 and the other end is connected to a converter 20.

[0160] In this way, the liquid chiller 80 and the two rows of converters 20 form a cooling circuit. The coolant in the liquid chiller 80 enters the first main pipeline 91 and is then distributed to multiple first branch pipelines 93 through the first main pipeline 91. The coolant in the first branch pipeline 93 enters the cold plate of the corresponding converter 20 through the liquid inlet 25. After absorbing the heat generated by the converter 20 in the cold plate, the coolant is discharged from the liquid outlet 26 into the second branch pipeline 94. The coolant in the multiple second main pipelines 92 all converges into the second branch pipeline 94 and finally flows back to the liquid chiller 80, where the liquid chiller 80 recools and pressurizes the coolant.

[0161] To facilitate the connection of the piping assembly 90 and the multiple converters 20, in some examples, the first main pipeline 91 and the second main pipeline 92 both extend along the arrangement direction of the multiple converters 20 within each row of converters 20. Multiple first branch pipelines 93 and multiple second branch pipelines 94 are arranged at intervals along the arrangement direction of the multiple converters 20 within each row of converters 20, with each first branch pipeline 93 corresponding to a converter 20, and each second branch pipeline 94 corresponding to a converter 20. Both the first branch pipelines 93 and the second branch pipelines 94 extend along the height direction of the cabinet 10, with the shortest length connecting to the converter.

[0162] To achieve the connection between converter 20 and piping assembly 90, such as Figure 17 As shown, in some examples, the front plate 23 of the converter 20 is provided with an inlet port 25 and an outlet port 26, a first branch pipe 93 is connected to the inlet port 25, and a second branch pipe 94 is connected to the outlet port 26.

[0163] To reduce the length of the first branch pipe 93 and the second branch pipe 94, in some examples, the liquid inlet port 25 and the liquid outlet port 26 are located at the top of the front panel 23, so that the liquid cooling unit 80 and the liquid inlet port 25 and the liquid outlet port 26 have a closer distance. The shorter first branch pipe 93 can then connect the first main pipe 91 and the liquid inlet port 25; similarly, the shorter second branch pipe 94 can then connect the second main pipe 92 and the liquid outlet port 26.

[0164] In some examples, the first branch pipe 93 and the second branch pipe 94 are both extended along the height of the cabinet 10, so that the first branch pipe 93 can be extended from the first main pipe 91 to the liquid inlet 25 through the shortest path; similarly, the second branch pipe 94 can be extended from the second main pipe 92 to the liquid outlet 26 through the shortest path.

[0165] In this embodiment, the number of liquid-cooled units 80 can be one, in which case the liquid-cooled unit 80 connects to all converters 20; in this embodiment, the number of liquid-cooled units 80 can be multiple, with multiple liquid-cooled units 80 arranged side by side along the arrangement direction of multiple converters 20 in each row of converters 20, and each liquid-cooled unit 80 connecting to some converters 20 in each row of converters 20. When the number of liquid-cooled units 80 is multiple, in order to simplify the wiring of the piping assembly, in some examples, along the height direction of the cabinet 10, the liquid-cooled unit 80 connects to the converter 20 located below it. In this case, the length of the piping assembly is minimized, and the wiring is simplest.

[0166] To facilitate heat exchange between the coolant and the converter 20, in some examples, each converter 20 is equipped with a cold plate for coolant flow. Both the inlet port 25 and the outlet port 26 are connected to the cold plate, allowing the coolant to exchange heat with the electrical components within the converter 20 via the cold plate. Compared to the cooling pipes originally installed within the converter 20, the cold plate provides a larger contact area with the electrical components, thus improving the heat dissipation efficiency of the converter 20.

[0167] In all the illustrations of this application, the arrangement direction of each row of converters 20 is parallel to the length direction of the cabinet 10. However, it can be understood that the arrangement direction of each row of converters 20 may also be parallel to the depth direction of the cabinet 10.

[0168] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any modifications or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A converter integrated cabinet, characterized in that, The converter integrated cabinet includes a cabinet body and a first heat insulation chamber, an AC busbar, and a converter disposed within the cabinet body. The AC busbar is disposed inside the first heat insulation chamber, and at least one end of the AC busbar extends through the chamber wall of the first heat insulation chamber to the outside of the first heat insulation chamber. The AC busbar is used to transmit AC power input to or output to the converter. The first heat insulation chamber is provided with a first opening. The converter includes a power conversion circuit, a DC terminal, and an AC terminal. The DC terminal is used to connect a DC source to the DC terminal of the power conversion circuit. The power conversion circuit is used to realize bidirectional power conversion between DC and AC. The AC terminal is used to connect the AC terminal of the power conversion circuit to the AC busbar. The AC terminal is located on any side of the converter. The AC terminal passes through the first opening and is connected to the AC busbar.

2. The converter integrated cabinet according to claim 1, characterized in that, The first heat insulation chamber has the first opening on one side and the converter has the AC terminal on the other side facing each other. Along the arrangement direction of the first heat insulation chamber with the first opening and the converter with the AC terminal, the orthographic projection of the AC terminal on the first heat insulation chamber is within the outline of the first opening.

3. The converter integrated cabinet according to claim 1 or 2, characterized in that, The converter integrated cabinet includes a plurality of converters arranged side by side. The first heat insulation chamber is provided with a plurality of first openings. The AC terminal of each converter passes through one of the openings and is connected to the AC busbar.

4. The converter integrated cabinet according to claim 1 or 2, characterized in that, The converter integrated cabinet includes two rows of converters. Each row of converters includes multiple converters. The arrangement direction of the multiple converters in each row is perpendicular to the arrangement direction of the two rows of converters. The back plate of one row of converters is arranged facing the back plate of the other row of converters and there is a gap between them. The first heat insulation chamber is at least partially disposed within the gap. Along the arrangement direction of the two rows of converters, the first heat insulation chamber has multiple first openings on its two side walls facing the two rows of converters. The AC terminal of each converter passes through the first opening and is connected to the AC busbar.

5. The converter integrated cabinet according to claim 3 or 4, characterized in that, The converter integrated cabinet includes a set of AC busbars, each set of AC busbars includes three AC busbars arranged side by side, and all AC terminals of the converters are connected to the three AC busbars.

6. The converter integrated cabinet according to claim 4, characterized in that, The converter integrated cabinet includes two sets of AC busbars, which are arranged side by side along the arrangement direction of the two rows of converters. Each set of AC busbars includes three AC busbars. The multiple AC terminals of one row of converters are correspondingly connected to the three AC busbars in one set of AC busbars.

7. The converter integrated cabinet according to any one of claims 1-6, characterized in that, The converter integrated cabinet also includes a support assembly, which is disposed in the first heat insulation chamber and fixed to the inner wall of the first heat insulation chamber. The support assembly connects the AC terminal and the AC busbar.

8. The converter integrated cabinet according to claim 7, characterized in that, The support assembly includes a first support and a second support. The first support is fixed to the inner wall of the first heat insulation chamber and extends along the arrangement direction of the converter. One end of the second support is connected to the first support, and the other end of the second support is connected to the AC busbar.

9. The converter integrated cabinet according to claim 8, characterized in that, Along the arrangement direction of the first opening of the first heat insulation chamber and the AC terminal of the converter, the AC terminal has a notch at the end away from the converter, and the first branch has a protrusion on the side facing the AC terminal, the protrusion being inserted into the notch.

10. The converter integrated cabinet according to any one of claims 2-6, characterized in that, Along the arrangement direction of the first opening on the first heat insulation chamber and the AC terminal on the side of the converter, the AC terminal has a notch on the side away from the converter, and the AC busbar has a protrusion facing the AC terminal, the protrusion being inserted into the notch.

11. The converter integrated cabinet according to any one of claims 1-10, characterized in that, The converter integrated cabinet also includes a heat exchanger disposed inside the cabinet, and the heat exchanger is connected to the first insulation chamber.

12. The converter integrated cabinet according to any one of claims 1-11, characterized in that, Along the arrangement direction of the first opening side of the first heat insulation chamber and the AC terminal side of the converter, a first sealing member is provided extending from the side with the first opening towards the converter, and the first sealing member surrounds the periphery of the AC terminal.

13. The converter integrated cabinet according to any one of claims 1-12, characterized in that, The first heat insulation chamber is provided with a second opening, and one end of the AC conductive bus extends through the second opening to the outside of the first heat insulation chamber; a second sealing member is provided extending from the side of the first heat insulation chamber with the second opening away from the first heat insulation chamber, and the second sealing member surrounds the periphery of the AC conductive bus.

14. The converter integrated cabinet according to any one of claims 1-13, characterized in that, Each converter has a front panel and a back panel facing each other, with the DC terminal disposed on the front panel; or, the front panel of the converter has a lower edge protruding from the bottom wall of the converter in the height direction of the cabinet, with the DC terminal located on the side of the lower edge facing the back panel of another row of converters; or, the DC terminal is disposed on the back panel.

15. The converter integrated cabinet according to any one of claims 1-14, characterized in that, The converter integrated cabinet includes a DC bus and a second heat insulation chamber; the DC bus is disposed in the second heat insulation chamber, and one end of the DC bus extends through the chamber wall of the second heat insulation chamber to the outside of the second heat insulation chamber. The DC bus is used to transmit DC power into or out of the converter. The second heat insulation chamber is provided with a third opening, through which the DC terminal passes and is connected to the DC bus.

16. The converter integrated cabinet according to claim 15, characterized in that, The second heat insulation chamber extends from the side with the third opening toward the converter and is provided with a third sealing member. The third sealing member surrounds the periphery of the DC terminal, and the end of the third sealing member away from the second heat insulation chamber contacts the side wall of the converter where the DC terminal is located.

17. The converter integrated cabinet according to claim 15 or 16, characterized in that, The second heat insulation chamber is provided with a fourth opening, and one end of the DC bus extends through the fourth opening to the outside of the second heat insulation chamber; a fourth sealing member extends from the side wall of the second heat insulation chamber away from the second heat insulation chamber, and the fourth sealing member surrounds the periphery of the DC bus.

18. The converter integrated cabinet according to any one of claims 15-17, characterized in that, Along the height direction of the cabinet, the end of the DC bus away from the DC terminal penetrates the bottom wall of the second heat insulation chamber.

19. The converter integrated cabinet according to any one of claims 15-18, characterized in that, The converter integrated cabinet includes multiple DC busbars and two rows of converters. Each row of converters includes multiple converters arranged side by side. The arrangement direction of the multiple converters in each row is perpendicular to the arrangement direction of the two rows of converters. The back plate of one row of converters is arranged facing the back plate of the other row of converters and there is a gap between them. The second heat insulation chamber is disposed within the gap. The second heat insulation chamber has multiple third openings on its two side walls facing the two rows of converters. The DC terminal of each converter passes through one of the third openings and is connected to a DC busbar.

20. The converter integrated cabinet according to any one of claims 1-19, characterized in that, One of the converter and the cabinet is provided with a positioning pin, and the other of the converter and the cabinet is provided with a positioning hole, and the positioning pin is inserted into the positioning hole.

21. The converter integrated cabinet according to any one of claims 1-16, characterized in that, The converter integrated cabinet includes a liquid-cooled unit, the converter includes a liquid-cooled plate, and the front plate is provided with a liquid inlet and a liquid outlet; both the liquid inlet and the liquid outlet are used to connect to the liquid-cooled unit, and both the liquid inlet and the liquid outlet are also used to connect to the liquid-cooled plate.

22. An energy storage system, characterized in that, The energy storage system includes an energy storage cabinet and a converter integrated cabinet according to any one of claims 1-21; the DC source is the energy storage cabinet, and the energy storage cabinet is connected to the plurality of DC terminals.

23. The energy storage system according to claim 22, characterized in that, The number of converter integrated cabinets is multiple, and the energy storage system includes a busbar. Both ends of the busbar are connected to connection terminals. One connection terminal is connected to the AC busbar in one converter integrated cabinet, and the other connection terminal is connected to the AC busbar in another converter integrated cabinet.

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