Energy storage cabinet and energy storage system

Abstract

The application provides an energy storage cabinet and an energy storage system. The energy storage cabinet comprises a cabinet. At least two battery clusters, a battery control unit and a DC-DC converter are sequentially stacked in the cabinet. The battery clusters are located at the bottom of the cabinet. The battery control unit is provided with two groups of connectors for each battery cluster. Each group of connectors comprises an input connector and an output connector. The busbar of each battery cluster is fixedly connected with a busbar copper bar, the busbar copper bar is inserted into the input connector, and the busbar copper bar is used for transmitting the electric energy input by the battery cluster to the battery control unit. The cabinet copper bar is arranged between the battery control unit and the DC-DC converter, the cabinet copper bar is inserted into the output connector and the DC-DC converter, and the cabinet copper bar is used for transmitting the electric energy input by the battery control unit to the DC-DC converter. The battery clusters and the DC-DC converter can be connected with the connectors of the battery control unit through the copper bars, so as to realize the cable-free power connection, and the cable layout of the energy storage cabinet can be simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric power, and particularly relates to a storage cabinet and a storage system. BACKGROUND

[0002] An uninterruptible power system (UPS) is a system that can supply power to a load uninterruptedly in the case of power grid failure (such as power failure, under-voltage, interference or surge), and maintain normal operation of the load. Specifically, the UPS is connected with a power grid, a load and a battery pack respectively. The UPS can monitor the working state of the power grid, and supply power to the load by using power provided by the power grid when the power grid works normally. When the power grid fails, the UPS can control the battery pack to discharge, and continue to supply power to the load by using power output by the battery pack.

[0003] At present, the battery pack is placed in a storage cabinet. In addition to the battery pack, a battery control unit (BCU), a direct current-direct current converter (DC-DC) and other modules are also placed in the cabinet. The battery pack and the BCU, and the modules are usually connected by power cables and communication cables, resulting in a relatively complex cable layout in the cabinet, which not only occupies more space. With the continuous increase of the power density of a data center, the storage cabinet currently faces the demand of large-rate discharge, and therefore how to realize high density in the existing storage cabinet is a problem to be solved urgently. SUMMARY

[0004] The present application provides a storage cabinet and a storage system to realize cable-free power connection, so as to simplify the cable layout of the storage cabinet.

[0005] In a first aspect, the present application provides an energy storage cabinet. Specifically, the energy storage cabinet comprises a cabinet, at least two battery clusters, a battery control unit and a DC-DC converter. The at least two battery clusters, the battery control unit and the DC-DC converter are located in the cabinet and are stacked in the height direction of the cabinet, and the at least two battery clusters are located at the bottom of the cabinet. Each of the at least two battery clusters comprises a plurality of battery packs stacked in the height direction of the cabinet. The battery control unit is electrically connected between the at least two battery clusters and the DC-DC converter. For each battery cluster, the battery control unit is provided with two groups of connectors. Each group of connectors comprises an input connector and an output connector. The busbar of each battery cluster is fixedly connected with a busbar copper bar, the busbar copper bar is inserted into the input connector, and the busbar copper bar is used to transmit the electrical energy input by the battery cluster to the battery control unit. The cabinet copper bar is provided between the battery control unit and the DC-DC converter. The cabinet copper bar is inserted into the output connector and the DC-DC converter. The cabinet copper bar is used to transmit the electrical energy input by the battery control unit to the DC-DC converter.

[0006] In the energy storage cabinet in the present application, the battery cluster, the battery control unit and the DC-DC converter are arranged in sequence from bottom to top, so that the current can pass through the battery cluster, the battery control unit and the DC-DC converter in sequence, or can pass through the DC-DC converter, the battery control unit and the battery cluster in sequence. The battery control unit is provided with an input connector and an output connector, and the electrical energy transmission between the busbar of the battery cluster and the battery control unit and between the DC-DC converter and the battery control unit can be realized through the copper bar, so as to realize the cable-free power connection, thereby simplifying the cable layout of the energy storage cabinet.

[0007] In actual application, the battery control unit and / or the DC-DC converter can be a plug-in type module, so as to further simplify the installation and maintenance of the energy storage cabinet. In a possible implementation, the busbar copper bar and the cabinet copper bar can be fixedly connected with the cabinet respectively. In this way, the cabinet can be pre-provided with the busbar copper bar and the cabinet copper bar. When installing, the battery control unit can be directly inserted into the cabinet, and the battery control unit is placed at the pre-set position while being plugged with the busbar copper bar and the cabinet copper bar. Moreover, when the battery control unit needs to be maintained, the battery control unit can be directly pulled out from the cabinet, and the maintenance can be performed outside the cabinet.

[0008] The battery control unit adopts a connector, and a circuit board inside the battery control unit is connected to the busbar copper bar and the cabinet copper bar through the connector. In a possible implementation, the battery control unit includes a first housing and a first circuit board located in the first housing. The first housing includes a first terminal panel, and the first circuit board is provided with a copper bar facing the first terminal panel. The input connector and the output connector each include a first insulating shell and two groups of first contact pieces. The first insulating shell penetrates the first terminal panel and is fixedly connected to the first terminal panel. The two groups of first contact pieces are located in the first insulating shell and are oppositely arranged, and each group of first contact pieces includes a plurality of first contact pieces stacked. The middle portions of the plurality of first contact pieces are fixedly connected to the first insulating shell, respectively, and the two ends of the two groups of first contact pieces are spaced apart by a certain distance and are movable relative to the first insulating shell. One end of the first insulating shell located outside the first housing is provided with an opening, the busbar copper bar penetrates the opening of the first insulating shell, and is inserted between one end of the two groups of first contact pieces. The other end of the first insulating shell extending into the first housing is provided with another opening, and the copper bar penetrates the other opening of the first insulating shell and is inserted between the other end of the two groups of first contact pieces. In this technical solution, the middle portions of the first contact pieces are fixedly connected to the first insulating shell, and the two ends are elastically deformed relative to the first insulating shell. When the copper bar in the battery control unit is inserted between the two groups of first contact pieces from the one end, the spacing distance between the two groups of first contact pieces at the one end is increased, and the spacing distance between the two groups of first contact pieces at the other end is reduced, so as to achieve the effect of clamping the busbar copper bar and the cabinet copper bar by the connector.

[0009] In a possible implementation, the input connectors of the two groups of connectors are arranged in sequence along the length direction of the cabinet, and the input connectors are arranged close to the at least two battery clusters. The output connectors of the two groups of connectors are arranged in sequence along the length direction of the cabinet, and the output connectors are arranged close to the DC-DC converter. Such a layout of the connectors can shorten the connection path between the battery control unit and the battery clusters, and make the internal layout of the energy storage cabinet more compact.

[0010] In another possible implementation, the DC-DC converter is provided with a plurality of connectors. The plurality of connectors includes a plurality of input connectors and a plurality of output connectors. The plurality of input connectors are arranged in one-to-one correspondence with the output connectors in the two groups of connectors. The cabinet copper bar is inserted into the plurality of input connectors. The cabinet is further provided with another cabinet copper bar, and the other cabinet copper bar is inserted into the plurality of output connectors, and the other cabinet copper bar is used to output the electric energy output by the DC-DC converter. In this technical solution, the DC-DC converter is provided with input connectors and output connectors, and the electric energy transmission between the battery control unit and the DC-DC converter and between the DC-DC converter and other devices can be achieved through the copper bars, so as to realize cable-free power connection and further simplify the cable layout of the energy storage cabinet.

[0011] In a possible implementation, the DC-DC converter comprises a second housing and a second circuit board located in the second housing. The second housing comprises a second terminal panel, and the second circuit board is provided with a plug facing the second terminal panel. The plug comprises an insulating cover and two conductive sheets, each of the two conductive sheets is provided in a bent structure, one end of each conductive sheet is parallel to the plane of the second circuit board and connected to the second circuit board, and the other end of each conductive sheet is perpendicular to the plane of the second circuit board. The insulating cover is sleeved on the surface of the two conductive sheets and fixedly connected with the two conductive sheets, and the other end of each conductive sheet penetrates the insulating cover. Each connector of the plurality of connectors comprises a second insulating shell and two groups of second contact sheets. The second insulating shell penetrates the second terminal panel and is fixedly connected with the second terminal panel. The two groups of second contact sheets are located in the second insulating shell and oppositely arranged, and each group of the two groups of second contact sheets comprises a plurality of second contact sheets stacked. The middle part of each of the plurality of second contact sheets is fixedly connected with the second insulating shell, and the two ends of the two groups of second contact sheets are spaced apart by a distance and can move relative to the second insulating shell. One end of the second insulating shell located outside the second housing is provided with an opening, and the cabinet copper bar or another cabinet copper bar penetrates the opening of the second insulating shell and is inserted between one end of the two groups of second contact sheets. The other end of the second insulating shell extending into the second housing is provided with another opening, and the other end of each conductive sheet penetrates the other opening of the second insulating shell and is inserted between the other end of the two groups of second contact sheets. In this technical solution, the middle part of the second contact sheet is fixedly connected with the second insulating shell, and the two ends can be elastically deformed relative to the second insulating shell. When the plug in the DC-DC converter is inserted between the two groups of second contact sheets from the one end, the spacing distance between the two groups of second contact sheets at the one end will increase, resulting in a decrease in the spacing distance between the two groups of second contact sheets at the other end, so as to realize the effect of clamping the cabinet copper bar and the other cabinet copper bar by the connector.

[0012] In a possible implementation, a sealing ring is arranged between the insulating cover and the second circuit board. The sealing ring fills the gap between the insulating cover and the second circuit board, plays a sealing and dustproof role, and can avoid the gluing process.

[0013] In a possible implementation, the plurality of input connectors are sequentially arranged along the length direction of the cabinet, and the plurality of input connectors are arranged close to the battery control unit. The plurality of output connectors are sequentially arranged along the length direction of the cabinet, and the plurality of output connectors are arranged close to the other cabinet copper bar. The connector layout of the DC-DC converter can shorten the connection path between the DC-DC converter and the battery control unit and the connection path between the DC-DC converter and the other cabinet copper bar, so that the internal layout of the energy storage cabinet is more compact.

[0014] In a possible implementation, the energy storage cabinet further comprises a switch assembly and an output busbar. The switch assembly is located between the DC-DC converter and the output busbar. Another cabinet copper bar is located between the DC-DC converter and the switch assembly, and the other cabinet copper bar and the output busbar are fixedly connected with the switch assembly respectively. The output busbar is used to output the electric energy of the energy storage cabinet to the outside. Therefore, when the battery cluster in the energy storage cabinet is charged, the current path in the energy storage cabinet is from top to bottom; when the battery cluster in the energy storage cabinet is discharged, the current path in the energy storage cabinet is from bottom to top, thereby simplifying the current path and improving the working efficiency of the energy storage cabinet.

[0015] In a second aspect, the present application provides an energy storage system. The energy storage system comprises the energy storage cabinet of the first aspect and a power converter. The power converter is used to convert alternating current input by an external alternating current power supply into direct current output to the energy storage cabinet, and / or the power converter is used to convert direct current output by the energy storage cabinet into alternating current output to a load or a power grid. The energy storage cabinet of the energy storage system can realize cable-free power connection, and the cable layout is simplified, thereby simplifying the installation and disassembly of the energy storage system and facilitating the maintenance of the energy storage system. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 An application scenario diagram of the energy storage cabinet provided by the embodiment of the present application;

[0017] Figure 2 A front view of the energy storage cabinet provided by the embodiment of the present application;

[0018] Figure 3 A structural schematic diagram of the energy storage cabinet provided by the embodiment of the present application;

[0019] Figure 4 Another structural schematic diagram of the energy storage cabinet provided by the embodiment of the present application;

[0020] Figure 5 A rear view of the battery control unit provided by the embodiment of the present application;

[0021] Figure 6 A rear view of the DC-DC converter provided by the embodiment of the present application;

[0022] Figure 7 A structural schematic diagram of the connector provided by the embodiment of the present application;

[0023] Figure 8 An exploded schematic diagram of the connector provided by the embodiment of the present application;

[0024] Figure 9 Another exploded schematic diagram of the connector provided by the embodiment of the present application;

[0025] Figure 10Another exploded view of the connector provided in an embodiment of this application;

[0026] Figure 11 A cross-sectional schematic diagram of a connector provided in an embodiment of this application;

[0027] Figure 12 This is a schematic diagram of the connection between the connector and the copper busbar provided in an embodiment of this application;

[0028] Figure 13 A cross-sectional schematic diagram of a connector provided in an embodiment of this application;

[0029] Figure 14 This is a schematic diagram illustrating the connection between the connector and the copper busbar or plug provided in an embodiment of this application.

[0030] Figure 15 A schematic diagram of a plug provided in an embodiment of this application;

[0031] Figure 16 An exploded view of a plug provided in an embodiment of this application;

[0032] Figure 17 Another exploded view of the plug provided in an embodiment of this application;

[0033] Figure 18 Another exploded view of the plug provided in an embodiment of this application.

[0034] Figure label:

[0035] 10-Energy Storage Cabinet

[0036] 11-Rack

[0037] 12-battery pack

[0038] 13-Battery Control Unit

[0039] 14-DC-DC converter

[0040] 15-Busbar Copper Busbar

[0041] 16-First rack copper busbar

[0042] 17-Second Cabinet Copper Busbar

[0043] 18-Switch Assembly

[0044] 19-Output Busbar

[0045] 21-First Outer Shell

[0046] 22-First Terminal Panel

[0047] 23-Second Outer Shell

[0048] 24 - second terminal panel

[0049] 30 - connector

[0050] 31 - insulating shell

[0051] 32 - first set of contact blades

[0052] 33 - second set of contact blades

[0053] 34 - first support blade

[0054] 35 - second support blade

[0055] 36 - insulating top cover

[0056] 37 - first fixing blade

[0057] 38 - second fixing blade

[0058] 39 - insulating housing

[0059] 41 - insulating cover

[0060] 42 - conductive blade

[0061] 43 - pin

[0062] 44 - sealing ring

[0063] 131 - first connector

[0064] 132 - copper bar

[0065] 141 - second connector

[0066] 142 - second circuit board

[0067] 143 - plug

[0068] 311 - first opening

[0069] 312 - second opening

[0070] 321 - contact blade

[0071] 322 - protrusion

[0072] 323 - hole

[0073] 131a - first input connector

[0074] 131b - first output connector

[0075] 141a - second input connector

[0076] 141b - second output connector DETAILED DESCRIPTION

[0077] In order to make the purposes, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings.

[0078] It should be noted that the terms used in the following examples are only for the purpose of describing specific embodiments and are not intended to be limiting of the present application. As used in the specification and the appended claims, the singular forms "a," "an" and "the" are intended to include both singular and plural forms, unless the context clearly indicates otherwise.

[0079] Reference herein to "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," or the like in the specification are not necessarily all referring to the same embodiment, unless otherwise specifically stated.

[0080] In this application, the terms "first", "second", etc. are used only for descriptive purposes and cannot be construed as indicating or implying relative importance or an implied indication of the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0081] In addition, in this document, the orientation terms such as "top", "bottom", "upper", "lower", etc. are defined with respect to the orientation of the structure shown in the drawings, and it should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the orientation of the structure.

[0082] In order to facilitate the understanding of the energy storage cabinet and the energy storage system provided by the embodiments of the present application, the application scenario thereof will be described below. The energy storage cabinet of the present application can be applied to household energy storage, industrial and commercial energy storage, or power station energy storage power supply system. Figure 1 An application scenario diagram of the energy storage cabinet provided by the embodiments of the present application. As shown in FIG. 1, the energy storage cabinet 1 is applied to a household energy storage power supply system. Figure 1As shown, in one embodiment, the energy storage cabinet 10 can be applied in an energy storage system. For example, when powering important loads such as core servers of a data center, an energy storage system (e.g., a UPS system) is usually provided. When the data center is working normally, the power input from the mains is transmitted to the UPS system after passing through the substation, and the power is provided to the load after being stabilized by the UPS system, and at the same time, the UPS system can also charge the battery pack in the energy storage cabinet 10. When the normal power supply is cut off, the battery pack in the energy storage cabinet 10 can provide power to the load for a certain period of time under the control of the UPS system to maintain the operation of the load.

[0083] The energy storage system can specifically include the energy storage cabinet 10 and a power converter. The power converter is used to convert the alternating current input from the external alternating current power supply into direct current and output to the energy storage cabinet 10, and / or the power converter is used to convert the direct current output from the energy storage cabinet 10 into alternating current and output to the load or the power grid. In the energy storage cabinet 10, the battery pack includes a plurality of battery packs. The energy storage cabinet 10 also includes a battery control unit and a DC-DC converter and other modules. The battery control unit is used to manage and control the charging and discharging of the plurality of battery packs. The battery control unit can boost the voltage input to the battery pack to achieve power conversion, thereby increasing or decreasing the output voltage of the energy storage cabinet 10. In addition, the battery control unit can also be used for leakage current detection, active function safety shutdown, single cluster short circuit large current passive safety protection, and signal aggregation of the battery pack. The DC-DC converter is used to perform power conversion on the power output by the battery pack to change the output voltage, thereby achieving constant power discharge.

[0084] In the current energy storage cabinet, the battery control unit is designed in a plug-in maintenance mode. For example, the battery control unit is connected to the battery pack through a cable. Specifically, the battery control unit is provided with a plug-in terminal, and the cable is correspondingly provided with a plug-in terminal. By inserting the plug-in terminal of the cable into the plug-in terminal of the battery control unit, power connection can be achieved. However, the current flowing in the above module is limited by the carrying capacity of the cable. Due to the limited internal space of the energy storage cabinet, the number of cables cannot be increased significantly, which limits the improvement of the large discharge rate of the energy storage cabinet.

[0085] In view of this, the present application provides an energy storage cabinet and an energy storage system to achieve cable-free power connection, thereby simplifying the cable layout of the energy storage cabinet.

[0086] It should be noted that power connection refers to a connection method that forms a strong electrical circuit between connected devices by transmitting power energy.

[0087] In the embodiments of this application, the energy storage cabinet 10 is used to provide electrical energy to at least one load. The energy storage cabinet 10 of this energy storage system enables cable-free power connection and simplifies cable layout, thereby simplifying the installation and disassembly of the energy storage system and facilitating its maintenance. The layout of the energy storage cabinet 10 is described in detail below.

[0088] Figure 2 A front view of an energy storage cabinet provided in an embodiment of this application. Figure 2 As shown, the energy storage cabinet 10 includes a cabinet 11, and multiple battery packs 12, battery control units 13, and DC-DC converters 14 located within the cabinet 11. The aforementioned multiple battery packs 12, battery control units 13, and DC-DC converters 14 are arranged along the height direction of the cabinet 11 (e.g., ...). Figure 2 (Vertical direction in the rack). Inside the rack 11, the aforementioned battery packs 12 are located at the bottom of the rack 11, and these battery packs 12 are along the length of the rack 11 (e.g., vertical direction). Figure 2 The cabinet 11 is arranged in at least two battery clusters in the horizontal direction, wherein each battery cluster includes at least one battery pack 12 stacked sequentially along the height direction of the cabinet 11, and the specific number is not limited.

[0089] Figure 3 This is a schematic diagram of a structure of an energy storage cabinet provided in an embodiment of this application. Figure 3 As shown, in one embodiment of this application, a busbar copper bus 15 is provided between the aforementioned at least two battery clusters and the battery control unit 13 within the energy storage cabinet 10. The busbars of the aforementioned at least two battery clusters are fixedly connected to the busbar copper bus 15. A first cabinet copper bus 16 may be provided between the battery control unit 13 and the DC-DC converter 14. The busbar copper bus 15 and the first cabinet copper bus 16 are respectively plugged into the battery control unit 13. The busbar copper bus 15 is used to transmit the electrical energy input from the battery pack 12 to the battery control unit 13. The first cabinet copper bus 16 is used to transmit the electrical energy input from the battery control unit 13 to the DC-DC converter 14. Further, in another embodiment, in addition to the first cabinet copper bus 16, a second cabinet copper bus 17 may be provided on the side of the DC-DC converter 14 away from the battery control unit 13. The first cabinet copper bus 16 and the second cabinet copper bus 17 are respectively plugged into the DC-DC converter 14. The second cabinet copper bus 17 is used to output the electrical energy output by the DC-DC converter 14.

[0090] Figure 4 This is another structural schematic diagram of the energy storage cabinet provided in an embodiment of this application. For example... Figure 4As shown, in the embodiment of the present application, the battery cluster, the battery control unit 13 and the DC-DC converter 14 of the energy storage cabinet 10 are arranged in sequence from bottom to top, so that the current can pass through the battery cluster, the battery control unit 13 and the DC-DC converter 14 in sequence, or can pass through the DC-DC converter 14, the battery control unit 13 and the battery cluster in sequence. Among them, the bus bar of the battery cluster and the battery control unit 13, the battery control unit 13 and the DC-DC converter 14, and the DC-DC converter 14 and other modules are respectively connected by copper bars to realize cable-free power connection, thereby simplifying the cable layout of the energy storage cabinet 10.

[0091] In actual application, the battery control unit 13 can be a plug-in module to further simplify the installation and maintenance of the energy storage cabinet 10. In one embodiment, the bus bar copper bar 15 and the first cabinet copper bar 16 can be fixed to the cabinet 11 respectively. In this way, the cabinet 11 can be pre-provided with the bus bar copper bar 15 and the first cabinet copper bar 16. When installing, the battery control unit 13 can be directly inserted into the cabinet 11, and during the insertion process, the battery control unit 13 is respectively plugged with the bus bar copper bar 15 and the first cabinet copper bar 16. When the battery control unit 13 needs to be maintained, the battery control unit 13 can be directly pulled out of the cabinet 11.

[0092] When installing the battery control unit 13, the back of the battery control unit 13 faces the cabinet 11 and slides into the cabinet 11. Figure 5 A rear view of the battery control unit provided in the embodiment of the present application is shown in FIG. 6. As shown in FIG. 6, the battery control unit 13 includes a first housing 21 and a first circuit board in the first housing 21. The first housing includes a first terminal panel 22 at the back of the battery control unit 13. The first circuit board is provided with a copper bar facing the first terminal panel 22, and the copper bar is plugged with the first connector 131. Figure 5 As shown, in one embodiment, the battery control unit 13 is provided with two groups of first connectors 131 corresponding to each of the at least two battery clusters. Each group of first connectors 131 includes a first input connector 131a and a first output connector 131b. The bus bar copper bar 15 is inserted into the first input connector 131a, and the first cabinet copper bar 16 is inserted into the first output connector 131b. In this embodiment, during the process of placing the battery control unit 13 into the cabinet 11, the bus bar copper bar 15 can be directly inserted into the first input connector 131a, and at the same time, the first cabinet copper bar 16 can be directly inserted into the first output connector 131b, so that the power connection between the battery control unit 13 and the copper bar is realized through the first connector 131. The first connector 131 is arranged at the back of the battery control unit 13. The battery control unit 13 includes a first housing 21 and a first circuit board in the first housing 21. The first housing includes a first terminal panel 22 at the back of the battery control unit 13. The first circuit board is provided with a copper bar facing the first terminal panel 22, and the copper bar is plugged with the first connector 131.

[0093] As shown in FIG. 6, the first connector 131 includes a first input connector 131a and a first output connector 131b. The bus bar copper bar 15 is inserted into the first input connector 131a, and the first cabinet copper bar 16 is inserted into the first output connector 131b. In this embodiment, during the process of placing the battery control unit 13 into the cabinet 11, the bus bar copper bar 15 can be directly inserted into the first input connector 131a, and at the same time, the first cabinet copper bar 16 can be directly inserted into the first output connector 131b, so that the power connection between the battery control unit 13 and the copper bar is realized through the first connector 131. Figure 5As shown, the battery control unit 13 has multiple first input connectors 131a along the length of the cabinet 11 (e.g., ...). Figure 2 The battery control unit 13 has multiple first output connectors 131b arranged sequentially along the length of the cabinet 11, with the first input connector 131a positioned close to the battery pack 12. The first output connectors 131b of the battery control unit 13 are also arranged sequentially along the length of the cabinet 11, with the first output connectors 131b positioned close to the DC-DC converter 14. This arrangement of the first connectors 131b allows the input side of the battery control unit 13 to be adjacent to the battery pack 12, shortening the connection path between the battery control unit 13 and the battery pack 12. Furthermore, the arrangement of the output side of the battery control unit 13 to be adjacent to the DC-DC converter 14 further shortens the connection path between the battery control unit 13 and the DC-DC converter 14, resulting in a more compact internal layout of the energy storage cabinet 10.

[0094] Similarly, the DC-DC converter 14 can be a pluggable module to further simplify the installation and maintenance of the energy storage cabinet 10. In one embodiment, the first cabinet copper busbar 16 and the second cabinet copper busbar 17 can be fixed to the cabinet 11 respectively. Thus, the cabinet 11 can be pre-configured with the first cabinet copper busbar 16 and the second cabinet copper busbar 17. During installation, the DC-DC converter 14 can be directly inserted into the cabinet 11, and during insertion, the DC-DC converter 14 will be plugged into the first cabinet copper busbar 16 and the second cabinet copper busbar 17 respectively. When maintenance of the DC-DC converter 14 is required, the DC-DC converter 14 can be directly removed from the cabinet 11.

[0095] Figure 6 This is a rear view of a DC-DC converter provided in an embodiment of this application. Figure 6 As shown, in another embodiment, the DC-DC converter 14 is provided with a plurality of second connectors 141. The aforementioned plurality of second connectors 141 include a plurality of second input connectors 141a and a plurality of second output connectors 141b. The aforementioned plurality of second input connectors 141a are configured one-to-one with the aforementioned plurality of first input connectors 131a. A first cabinet copper busbar 16 is inserted into the second input connector 141a, and a second cabinet copper busbar 17 is inserted into the second output connector 141b. In this embodiment, during the process of placing the DC-DC converter 14 into the cabinet 11, the first cabinet copper busbar 16 can be directly inserted into the second input connector 141a, and the second cabinet copper busbar 17 can be directly inserted into the second output connector 141b, thus achieving power connection between the DC-DC converter 14 and the copper busbar through the connectors. The second connectors 141 are located on the back side of the DC-DC converter 14. The DC-DC converter 14 includes a second housing 23 and a second circuit board located within the second housing 23. The second housing 23 includes a second terminal panel 24 located on the back side of the DC-DC converter 14, and the second circuit board is provided with a plug facing the second terminal panel 24.

[0096] As shown in Figure 6 , the plurality of second input connectors 141a of the DC-DC converter 14 are arranged in sequence along the length direction of the cabinet 11, and the second input connectors 141a are arranged close to the battery control unit 13. The plurality of second output connectors 141b of the DC-DC converter 14 are arranged in sequence along the length direction of the cabinet 11, and the second output connectors 141b are arranged close to the second cabinet copper bar 17. Such layout of the second connectors 141 makes the input side of the DC-DC converter 14 arranged adjacent to the output side of the battery control unit 13, which can shorten the connection path between the DC-DC converter 14 and the battery control unit 13, and makes the output side of the DC-DC converter 14 arranged adjacent to the second cabinet copper bar 17, which can shorten the connection path between the DC-DC converter 14 and the second cabinet copper bar 17, so that the internal layout of the energy storage cabinet 10 is more compact.

[0097] As shown in Figure 3As shown, when two battery clusters are arranged in the energy storage cabinet 10, the plurality of first input connectors 131a of the battery control unit 13 include a first positive input port (1+IN), a first negative input port (1-IN), a second positive input port (2+IN), and a second negative input port (2-IN). The first positive input port (1+IN) is connected to the positive bus of one of the battery clusters, and the first negative input port (1-IN) is connected to the negative bus of the battery cluster. The second positive input port (2+IN) is connected to the positive bus of the other battery cluster, and the second negative input port (2-IN) is connected to the negative bus of the battery cluster. The plurality of first output connectors 131b of the battery control unit 13 include a first positive output port (1+OUT), a first negative output port (1-OUT), a second positive output port (2+OUT), and a second negative output port (2-OUT). The plurality of second input connectors 141a of the DC-DC converter 14 include a bus positive input port (BUS+), a bus negative input port (BUS-), a first battery positive input port (BAT 1+), a second battery positive input port (BAT 2+), and a second battery negative input port (BAT 2-). Among them, the bus positive input port (BUS+) and the second battery positive input port (BAT 2+) can share one second input connector 141a. The plurality of second output connectors 141b of the DC-DC converter 14 include a bus positive output port (BUS+), a bus negative output port (BUS-), a bus neutral output port (BUS N), and a first battery negative input port (BAT 1-). Among them, the bus negative output port (BUS-) and the first battery negative input port (BAT 1-) can share one second output connector 141b. The bus positive input port (BUS+) and the second battery positive input port (BAT 2+) are connected to the second positive output port (2+OUT) through a first cabinet copper bar 16, the second battery negative input port (BAT 2-) is connected to the second negative output port (2-OUT) through a first cabinet copper bar 16, and the bus negative input port (BUS-) is connected to the first negative output port (1-OUT) through a first cabinet copper bar 16. The first battery positive input port (BAT 1+) is connected to the first positive output port (1+OUT) through a first cabinet copper bar 16.

[0098] In the above embodiment, the first connector 131 of the battery control unit 13 and the second connector 141 of the DC-DC converter 14 can be the same type of connector. The structure of the first connector 131 and the second connector 141 will be described in detail below.

[0099] The first connector 131 and the second connector 141 are both connector 30. Figure 7A structural schematic diagram of a connector provided by an embodiment of the present application, Figure 8 An exploded schematic diagram of a connector provided by an embodiment of the present application, Figure 9 Another exploded schematic diagram of a connector provided by an embodiment of the present application. As shown in Figure 7 、 Figure 8 and Figure 9 shown, the connector 30 comprises an insulating shell 31 and two groups of contact blades. The insulating shell 31 penetrates the first terminal panel 22 (or the second terminal panel 24) and is fixedly connected with the first terminal panel 22 (or the second terminal panel 24). The two groups of contact blades are oppositely arranged in the insulating shell 31, and each group of contact blades comprises a plurality of contact blades 321 stacked one on another.

[0100] Figure 10 Another exploded schematic diagram of a connector provided by an embodiment of the present application. As shown in Figure 10 , each contact blade 321 is in the shape of a strip, and the contact blade 321 is provided with two protrusions 322 which are located in the middle of the contact blade 321 and are spaced apart at a certain distance. The two groups of contact blades are oppositely arranged, specifically, one contact blade 321 of the first group of contact blades 32 is oppositely arranged with one contact blade 321 of the second group of contact blades 33, and the protrusions 322 of the two contact blades 321 are oppositely and adjacently arranged, thereby forming a hole 323. When a plurality of contact blades 321 are stacked to form a group of contact blades, the holes 323 formed by the plurality of contact blades 321 of the two groups of contact blades are communicated. The connector 30 further comprises a first fixing blade 37 and a second fixing blade 38. The second fixing blade 38 is inserted into the hole 323. The first fixing blade 37 is in the shape of a U, and the first fixing blade 37 oppositely fixes the two groups of contact blades. The first fixing blade 37 is provided with a notch which is opposite to and communicated with the hole 323, thereby allowing the second fixing blade 38 to be inserted into the hole 323 through the notch of the first fixing blade 37. In this way, the middle portions of the two groups of contact blades are oppositely fixed with the insulating shell 31, and the two ends of the two groups of contact blades are spaced apart at a certain distance and can move relative to the insulating shell 31. In addition, the second fixing blade 38 can be provided with a protrusion, and the inner wall of the notch of the first fixing blade 37 can be provided with a recess. When the second fixing blade 38 is inserted into the first fixing blade 37, the protrusion of the second fixing blade 38 can be clamped with the recess of the first fixing blade 37, thereby oppositely fixing the first fixing blade 37 and the second fixing blade 38.

[0101] Please continue to refer to Figure 7 to Figure 9The insulating shell 31 comprises an insulating shell body 39 and an insulating top cover 36. The insulating shell body 39 penetrates the first terminal panel 22 (or the second terminal panel 24) and is fixedly connected with the first terminal panel 22 (or the second terminal panel 24). The insulating shell body 39 can be fixedly connected with the first terminal panel 22 (or the second terminal panel 24) by means of screwing, welding or bonding. The insulating shell body 39 is provided with a notch at one end located in the first housing 21 (or the second housing 23). The insulating top cover 36 is connected with the notch of the insulating shell 31 and forms a containing space, i.e., the insulating top cover 36 and the insulating shell 31 jointly form the insulating shell 31 of the connector 30. The two groups of contact pieces, the first fixed piece 37 and the second fixed piece 38 are limited in the containing space. When the connector 30 is fixed on the first terminal panel 22 (or the second terminal panel 24), the insulating top cover 36 is located in the first housing 21 (or the second housing 23).

[0102] The insulating top cover 36 can also be provided with an opening, so that the opening of the insulating top cover 36 communicates with the notch of the insulating top cover 36 to form a second opening 312 of the insulating shell 31. That is, the end of the insulating shell 31 extending into the first housing 21 (or the second housing 23) is provided with the second opening 312. The copper bar of the first circuit board (or the plug of the second circuit board) penetrates the second opening 312 of the insulating shell 31 and is inserted between the other ends of the two groups of contact pieces. The end of the insulating shell body 39 located outside the first housing 21 (or the second housing 23) is provided with a first opening 311. The bus copper bar 15 (or the first cabinet copper bar 16 or the second cabinet copper bar 17) penetrates the first opening 311 of the insulating shell 31 and is inserted between one end of the two groups of contact pieces.

[0103] Figure 11 A sectional view of the connector provided by the embodiment of the present application, Figure 12 A connection diagram of the connector provided by the embodiment of the present application and the copper bar, Figure 13 A sectional view of the connector provided by the embodiment of the present application, Figure 14 A connection diagram of the connector provided by the embodiment of the present application and the copper bar or the plug. As Figure 11 to Figure 14As shown, each first connector 131 can further include two support pieces. The two support pieces are fixed in the insulating shell 31. The two support pieces include a first support piece 34 and a second support piece 35. The first support piece 34, the first group of contact pieces 32, the second group of contact pieces 33 and the second support piece 35 are sequentially arranged in a direction. The first group of contact pieces 32 and the second group of contact pieces 33 are spaced apart by a certain distance at one end of the connector 30 and extend into the battery control unit 13. The first group of contact pieces 32 and the second group of contact pieces 33 are spaced apart by another certain distance at the other end of the connector 30 and are located outside the battery control unit 13. In this embodiment, the first support piece 34 is used to support the first group of contact pieces 32, and the second support piece 35 is used to support the second group of contact pieces 33. The middle portions of the first group of contact pieces 32 and the second group of contact pieces 33 are respectively fixed relative to the insulating shell 31, and the two ends of the first group of contact pieces 32 and the two ends of the second group of contact pieces 33 can be respectively elastically deformed relative to the insulating shell 31. When the copper bars 132 in the battery control unit 13 are inserted between the first group of contact pieces 32 and the second group of contact pieces 33 from the other end, the first group of contact pieces 32 and the second group of contact pieces 33 will increase the spacing distance at the other end, resulting in a decrease in the spacing distance at the one end of the first group of contact pieces 32 and the second group of contact pieces 33, so as to achieve the effect of clamping the bus copper bars 15 and the first cabinet copper bars 16 by the connector 30.

[0104] The DC-DC converter 14 is provided with a second circuit board 142, and the second circuit board 142 is provided with a plug 143 corresponding to each second connector 141. The plug 143 is inserted between the first group of contact pieces 32 and the second group of contact pieces 33 at the one end of the second connector 141. Figure 15 A structural schematic diagram of the plug provided by the embodiment of the application is shown in Figure 16 An exploded schematic diagram of the plug provided by the embodiment of the application is shown in Figure 17 Another exploded schematic diagram of the plug provided by the embodiment of the application is shown in Figure 15 、 Figure 16 and Figure 17 As shown, the plug 143 includes an insulating cover 41 and two conductive pieces 42. Each of the two conductive pieces 42 is arranged in a bent structure. One end of each conductive piece 42 is parallel to the plane of the second circuit board 142 and connected to the second circuit board 142, and the other end of each conductive piece 42 is perpendicular to the plane of the second circuit board 142. The insulating cover 41 is sleeved on the surfaces of the two conductive pieces 42 and fixedly connected with the two conductive pieces 42, and the other end of each conductive piece 42 penetrates the insulating cover 41. The other end of each conductive piece 42 penetrates the other opening of the second insulating shell and is inserted between the other ends of the two groups of second contact pieces.

[0105] When installing the plug 143, the conductive piece 42 is soldered to the second circuit board 142. An insulating cover 41 covers the conductive piece 42. One end of the conductive piece 42 extends out of the insulating cover 41 and is used to insert between the first set of contact pieces 32 and the second set of contact pieces 33. Therefore, after the DC-DC converter 14 is assembled, the second connector 141 is connected to the plug 143 of the second circuit board 142. Thus, during the insertion of the DC-DC converter 14 into the cabinet 11, the first cabinet copper busbar 16 and the second cabinet copper busbar 17 are respectively inserted into the second connector 141, thereby achieving power connection between the first cabinet copper busbar 16 and the second cabinet copper busbar 17 and the DC-DC converter 14. Additionally, the conductive piece 42 may include two copper busbars. These two copper busbars are arranged opposite each other and are fixed together with the insulating cover 41 by pins 43.

[0106] Figure 18 Another exploded view of the plug provided in an embodiment of this application. (See attached image.) Figure 18 As shown, in one embodiment, a sealing ring 44 is provided between the insulating cover 41 and the second circuit board 142. The sealing ring 44 fills the gap between the insulating cover 41 and the second circuit board 142, serving to seal and prevent dust, thus avoiding the need for adhesive application.

[0107] like Figure 2 and Figure 4 As shown, in the energy storage cabinet 10 of this application, a switching assembly 18 and an output busbar 19 are stacked above the DC-DC converter 14. The switching assembly 18 is located between the DC-DC converter 14 and the output busbar 19. The second cabinet copper busbar 17 is fixedly connected to the output busbar 19 and the switching assembly 18 respectively. The output busbar 19 is used to output electrical energy from the energy storage cabinet 10 to the power converter. Therefore, when the battery clusters in the energy storage cabinet 10 are charging, the current path in the energy storage cabinet 10 is from top to bottom. When the battery clusters in the energy storage cabinet 10 are discharging, the current path in the energy storage cabinet 10 is from bottom to top, thereby simplifying the current path and improving the working efficiency of the energy storage cabinet 10.

[0108] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology 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. An energy storage cabinet, characterized in that, The device includes a cabinet, and at least two battery clusters, a battery control unit, and a DC-DC converter, which are located inside the cabinet and stacked sequentially along the height direction of the cabinet. The at least two battery clusters are located at the bottom of the cabinet, and each of the at least two battery clusters includes a plurality of battery packs stacked along the height direction. The battery control unit is electrically connected between the at least two battery clusters and the DC-DC converter. For each battery cluster, the battery control unit is provided with two sets of connectors, each set of connectors including an input connector and an output connector; the busbar of each battery cluster is fixedly connected to a busbar copper bus, the busbar copper bus is inserted into the input connector, and the busbar copper bus is used to transmit the electrical energy input from the battery cluster to the battery control unit; A cabinet copper busbar is provided between the battery control unit and the DC-DC converter, and the cabinet copper busbar is fixedly connected to the cabinet; the cabinet copper busbar is inserted into the output connector and the DC-DC converter, and the cabinet copper busbar is used to transmit the electrical energy input from the battery control unit to the DC-DC converter.

2. The energy storage cabinet as described in claim 1, characterized in that, The busbar copper busbar is fixedly connected to the cabinet.

3. The energy storage cabinet as described in claim 1 or 2, characterized in that, The battery control unit includes a first housing and a first circuit board located inside the first housing; the first housing includes a first terminal panel, and the first circuit board is provided with a copper busbar facing the first terminal panel; Both the input connector and the output connector include a first insulating shell and two sets of first contact pieces; the first insulating shell penetrates through the first terminal panel and is fixedly connected to the first terminal panel; the two sets of first contact pieces are located inside the first insulating shell and are arranged opposite to each other, each set of first contact pieces includes multiple stacked first contact pieces; the middle portions of the multiple first contact pieces are respectively fixed relative to the first insulating shell, and the two ends of the two sets of first contact pieces are respectively spaced apart by a set distance and can move relative to the first insulating shell; The first insulating shell has an opening at one end outside the first outer shell, through which the busbar copper bus passes and is inserted between one end of the two sets of first contact pieces; the first insulating shell has another opening at one end extending into the first outer shell, through which the copper bus passes and is inserted between the other end of the two sets of first contact pieces.

4. The energy storage cabinet as described in claim 1 or 2, characterized in that, The input connectors of the two sets of connectors are arranged sequentially along the length of the cabinet and close to the at least two battery clusters, and the output connectors of the two sets of connectors are arranged sequentially along the length of the cabinet and close to the DC-DC converter.

5. The energy storage cabinet as described in claim 1 or 2, characterized in that, The DC-DC converter is provided with multiple connectors, including multiple input connectors and multiple output connectors, and the multiple input connectors are configured to correspond one-to-one with the output connectors in the two sets of connectors; The cabinet copper busbar is inserted into the plurality of input connectors; the cabinet is also provided with another cabinet copper busbar, which is inserted into the plurality of output connectors, and the other cabinet copper busbar is used to output the electrical energy output by the DC-DC converter.

6. The energy storage cabinet as described in claim 5, characterized in that, The DC-DC converter includes a second housing and a second circuit board located inside the second housing; the second housing includes a second terminal panel, and the second circuit board is provided with a plug facing the second terminal panel; The plug includes an insulating cover and two conductive pieces. Each of the two conductive pieces is arranged in a bent structure. One end of each conductive piece is parallel to the plane of the second circuit board and connected to the second circuit board. The other end of each conductive piece is perpendicular to the plane of the second circuit board. The insulating cover is sleeved on the surface of the two conductive pieces and fixedly connected to the two conductive pieces. The other end of each conductive piece passes through the insulating cover. Each of the plurality of connectors includes a second insulating shell and two sets of second contact pieces; the second insulating shell penetrates through the second terminal panel and is fixedly connected to the second terminal panel; the two sets of second contact pieces are located inside the second insulating shell and are arranged opposite to each other, each set of second contact pieces includes a plurality of stacked second contact pieces; the middle portions of the plurality of second contact pieces are respectively fixed relative to the second insulating shell, and the two ends of the two sets of second contact pieces are respectively spaced apart by a predetermined distance and can move relative to the second insulating shell; The second insulating shell has an opening at one end outside the second outer shell. The cabinet copper busbar or the other cabinet copper busbar passes through the opening of the second insulating shell and is inserted between one end of the two sets of second contact pieces. The second insulating shell has another opening at one end extending into the second outer shell. The other end of each conductive piece passes through the other opening of the second insulating shell and is inserted between the other ends of the two sets of second contact pieces.

7. The energy storage cabinet as described in claim 6, characterized in that, A sealing ring is provided between the insulating cover and the second circuit board, and the sealing ring fills the gap between the insulating cover and the second circuit board.

8. The energy storage cabinet as described in claim 5, characterized in that, The plurality of input connectors are arranged sequentially along the length of the cabinet and close to the battery control unit, and the plurality of output connectors are arranged sequentially along the length of the cabinet and close to the copper busbar of the other cabinet.

9. The energy storage cabinet as described in claim 5, characterized in that, The energy storage cabinet also includes a switch assembly and an output busbar; the switch assembly is located between the DC-DC converter and the output busbar; another cabinet copper busbar is located between the DC-DC converter and the switch assembly, and the other cabinet copper busbar and the output busbar are respectively fixedly connected to the switch assembly; the output busbar is used to output the electrical energy of the energy storage cabinet to the outside.

10. An energy storage system, characterized in that, The energy storage system includes an energy storage cabinet as described in any one of claims 1 to 9, and a power converter, wherein the power converter is used to convert AC power input from an external AC power source into DC power output to the energy storage cabinet, and / or, the power converter is used to convert DC power output from the energy storage cabinet into AC power output to a load or the power grid.

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