Convergence cabinet and energy storage system

Abstract

The embodiment of the utility model provides a convergence cabinet and an energy storage system. The confluence cabinet comprises a DC bus and an auxiliary power supply system. The direct-current bus is connected to an energy storage converter and is also connected to a plurality of battery cabinets which are connected in parallel; the auxiliary power supply system is connected to a power supply, and the auxiliary power supply system is also connected to a plurality of battery cabinets; and the auxiliary power supply system is used for supplying power to the plurality of battery cabinets. In the technical scheme of the embodiment of the invention, the confluence cabinet comprises the DC bus and the auxiliary power supply system, and the plurality of battery cabinets are connected in parallel to the DC bus of the confluence cabinet, so that when a certain battery cabinet is on fire, the connection between the battery cabinet and the confluence cabinet can be cut off in time, and the confluence cabinet and other battery cabinets are prevented from being connected by fire; therefore, loss is avoided.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of energy storage technology, and in particular to a combiner cabinet and an energy storage system. Background Art

[0002] At present, in the field of energy storage technology, the application of combiner cabinets is becoming more and more widespread. In industrial and commercial energy storage systems, combiner cabinets are power distribution devices that ensure the orderly connection and convergence of battery cabinets. Users can connect several battery cabinets to the combiner cabinet, and then connect them to the energy storage converter after the combiner cabinet is merged.

[0003] However, batteries are flammable. Once a battery in a battery cabinet catches fire, the junction box and other battery cabinets will be affected by the fire, causing losses. Utility Model Content

[0004] In view of this, an embodiment of the present application provides a combiner cabinet and a storage system, which are used to prevent the combiner cabinet and other battery cabinets from being affected by fire, thereby avoiding losses.

[0005] A first aspect provides a combiner cabinet, comprising: a DC bus and an auxiliary power supply system;

[0006] The DC bus is connected to an energy storage converter, and the DC bus is also connected to a plurality of battery cabinets connected in parallel;

[0007] The auxiliary power supply system is connected to a power supply, and the auxiliary power supply system is also connected to a plurality of battery cabinets;

[0008] The auxiliary power supply system is used to supply power to the plurality of battery cabinets.

[0009] In a possible implementation, the DC bus includes a positive bus and a negative bus;

[0010] A first isolating switch and a first fuse are provided between the positive bus and the energy storage converter, and the first isolating switch and the first fuse are connected in series between the positive bus and the energy storage converter;

[0011] A second isolating switch and a second fuse are provided between the negative bus and the energy storage converter. The second isolating switch and the second fuse are connected in series between the negative bus and the energy storage converter.

[0012] In a possible implementation, the auxiliary power supply system includes an incoming line, a first AC bus, a first power supply line, and a second power supply line;

[0013] The first end of the incoming line is connected to an AC power source, and the second end of the incoming line is connected to the first AC bus;

[0014] A first end of the first power supply line is connected to the first AC bus, a second end of the first power supply line is connected to a plurality of high-voltage boxes of the battery cabinets, and the first power supply line is used to supply power to the plurality of high-voltage boxes;

[0015] A first end of the second power supply line is connected to the first AC bus, a second end of the second power supply line is connected to liquid cooling units of a plurality of the battery cabinets, and the second power supply line is used to supply power to the plurality of the liquid cooling units.

[0016] In a possible implementation, the first power supply circuit includes an isolation transformer, an uninterruptible power supply, a second AC bus, and a plurality of first outgoing lines;

[0017] The isolation transformer and the uninterruptible power supply are arranged between the first AC bus and the second AC bus, and the isolation transformer and the uninterruptible power supply are connected in series;

[0018] A first end of each of the first outgoing lines is connected to the second AC busbar, and a second end of each of the first outgoing lines is connected to the corresponding high-voltage box.

[0019] In a possible implementation, the second power supply circuit includes a plurality of second outgoing lines;

[0020] A first end of each of the second outgoing lines is connected to the first AC bus, and a second end of each of the second outgoing lines is connected to the corresponding liquid cooling unit.

[0021] In a possible implementation manner, a first circuit breaker is provided on the incoming line.

[0022] In a possible implementation manner, a second circuit breaker is provided on each of the first outgoing lines.

[0023] In a possible implementation manner, a third circuit breaker is provided on each of the second outgoing lines.

[0024] A second aspect provides an energy storage system, characterized by comprising a combiner cabinet and a plurality of battery cabinets in the first aspect or any possible implementation of the first aspect.

[0025] In a possible implementation, the battery cabinet includes a battery cluster, a high-voltage box, and a liquid cooling unit, and the DC bus includes a positive bus and a negative bus;

[0026] The first positive connector of the high-voltage box is connected to the positive electrode of the battery cluster through a power cable, and the first negative connector of the high-voltage box is connected to the negative electrode of the battery cluster through a power cable;

[0027] The second positive connector of the high-voltage box is connected to the positive busbar through a power cable, and the second negative connector of the high-voltage box is connected to the negative busbar through a power cable;

[0028] The power supply end of the high-voltage box is connected to the auxiliary power supply system;

[0029] The power supply end of the liquid cooling unit is connected to the auxiliary power supply system.

[0030] In the technical solution provided in the embodiment of the present application, the junction box includes a DC bus and an auxiliary power supply system, and multiple battery cabinets are connected in parallel to the DC bus of the junction box, so that when a battery cabinet catches fire, the connection between the battery cabinet and the junction box can be cut off in time, thereby preventing the junction box and other battery cabinets from being affected by the fire, thereby avoiding losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 A schematic diagram of the structure of a combiner cabinet provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the structure of an energy storage system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0035] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0036] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0037] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0038] Figure 1 A schematic diagram of the structure of a combiner cabinet provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the combiner cabinet 1 may include a DC busbar and an auxiliary power supply system, wherein the DC busbar is connected to a power conversion system (PCS), and the DC busbar is also connected to a plurality of parallel battery cabinets. The auxiliary power supply system is connected to an AC power source, and the auxiliary power supply system is also connected to a plurality of battery cabinets, and the auxiliary power supply system is used to supply power to the plurality of battery cabinets.

[0039] like Figure 1 As shown, the DC bus can be used to combine the current output by multiple battery cabinets.

[0040] like Figure 1 As shown, the DC bus includes a positive bus 11 and a negative bus 12. A first disconnector QS1 may be provided between the positive bus 11 and the PCS, and a second disconnector QS2 may be provided between the negative bus 12 and the PCS. The first disconnector QS1 and the second disconnector QS2 may be used to control the on and off of the circuit. A first fuse FU1 may be provided between the positive bus 11 and the PCS, and a second fuse FU2 may be provided between the negative bus 12 and the PCS. The first fuse FU1 and the second fuse FU2 may be used as short-circuit protection devices.

[0041] like Figure 1 As shown, in a possible implementation, a first isolating switch QS1 and a first fuse FU1 are provided between the positive bus 11 and the PCS, and the first isolating switch QS1 and the first fuse FU1 are connected in series between the positive bus 11 and the PCS. Specifically, a first end of the first isolating switch QS1 is connected to the PCS, a second end of the first isolating switch QS1 is connected to a first end of the first fuse FU1, and a second end of the first fuse FU2 is connected to the positive bus 11.

[0042] like Figure 1As shown, in a possible implementation, a second isolating switch QS2 and a second fuse FU2 are provided between the negative bus 12 and the PCS, and the second isolating switch QS2 and the second fuse FU2 are connected in series between the negative bus 12 and the PCS. Specifically, a first end of the second isolating switch QS2 is connected to the PCS, a second end of the second isolating switch QS2 is connected to a first end of the second fuse FU2, and a second end of the second fuse FU2 is connected to the negative bus 12.

[0043] like Figure 1 As shown, the auxiliary power supply system includes an incoming line 13, a first AC bus 14, a first power supply line, and a second power supply line. The first end of the incoming line 13 is connected to an AC power source, and the second end of the incoming line 13 is connected to the first AC bus 14. The first end of the first power supply line is connected to the first AC bus 14, and the second end of the first power supply line is connected to the high-voltage boxes of multiple battery cabinets, and the first power supply line is used to supply power to the multiple high-voltage boxes. The first end of the second power supply line is connected to the first AC bus 14, and the second end of the second power supply line is connected to the liquid cooling units of multiple battery cabinets, and the second power supply line is used to supply power to the multiple liquid cooling units. Among them, the first AC bus 14 can be used to shunt the current output by the AC power source.

[0044] like Figure 1 As shown, the first power supply line includes an isolation transformer T, an uninterruptible power supply (UPS), a second AC bus 15 and a plurality of first outgoing lines 16. The isolation transformer T and the UPS are arranged between the first AC bus 14 and the second AC bus 15, and the isolation transformer T and the UPS are connected in series. Specifically, the first end of the isolation transformer T is connected to the first AC bus 14, the second end of the isolation transformer T is connected to the first end of the UPS, and the second end of the UPS is connected to the second AC bus 15. The first end of each first outgoing line 16 is connected to the second AC bus 15, and the second end of each first outgoing line 16 is connected to the corresponding high-voltage box. The isolation transformer T is arranged in the junction cabinet to meet the conversion of different power supply formats. For example, the isolation transformer T can convert a voltage of 480V into a voltage of 220V. The UPS is arranged in the junction cabinet to meet the power supply requirements of the backup power supply of the fire protection and control system. Among them, the second AC bus 15 can be used to shunt the current output by the UPS.

[0045] like Figure 1 As shown, the second power supply circuit includes a plurality of second outgoing lines 17 , a first end of each second outgoing line 17 is connected to the first AC bus 14 , and a second end of each second outgoing line 17 is connected to a corresponding liquid cooling unit.

[0046] like Figure 1As shown, a first circuit breaker QF1 is provided on the incoming line. Specifically, the first circuit breaker QF1 is provided between the AC power source and the first AC bus 14 .

[0047] like Figure 1 As shown, each first outgoing line is provided with a second circuit breaker QF2. Specifically, the second circuit breaker QF2 is provided between the second AC bus 15 and the corresponding high-voltage box.

[0048] like Figure 1 As shown, a third circuit breaker QF3 is provided on each second outgoing line 17. Specifically, the third circuit breaker QF3 is provided between the first AC bus 14 and the corresponding liquid cooling unit.

[0049] like Figure 1 As shown, a fourth circuit breaker QF4 is provided between the first AC bus 14 and the isolation transformer T, and a fifth circuit breaker QF5 is provided between the isolation transformer T and the UPS.

[0050] In an embodiment of the present application, in an auxiliary power supply system, multiple circuit breakers are arranged on the input and output lines of the auxiliary power supply circuit to provide short circuit and overload protection.

[0051] In the technical solution provided in the embodiment of the present application, the junction box includes a DC bus and an auxiliary power supply system, and multiple battery cabinets are connected in parallel to the DC bus of the junction box, so that when a battery cabinet catches fire, the connection between the battery cabinet and the junction box can be cut off in time, thereby preventing the junction box and other battery cabinets from being affected by the fire, thereby avoiding losses.

[0052] Figure 2 A schematic diagram of the structure of an energy storage system provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the energy storage system includes a combiner cabinet 1 and a plurality of battery cabinets 2, and the plurality of battery cabinets 2 are connected in parallel to the combiner cabinet 1. The number of the plurality of battery cabinets 2 can be set according to product design requirements, for example, the number of the battery cabinets 2 can be 16.

[0053] like Figure 2 As shown, the combiner cabinet 1 may include a DC bus and an auxiliary power supply system, wherein the DC bus is connected to the PCS, and the DC bus is also connected to a plurality of parallel battery cabinets 2. The auxiliary power supply system is connected to an AC power source, and the auxiliary power supply system is also connected to a plurality of battery cabinets 2, and the auxiliary power supply system is used to supply power to the plurality of battery cabinets 2.

[0054] like Figure 2 As shown, the DC bus can be used to converge the currents output by multiple battery cabinets 2 .

[0055] like Figure 2As shown, the DC bus includes a positive bus 11 and a negative bus 12. A first isolating switch QS1 may be provided between the positive bus 11 and the PCS, and a second isolating switch QS2 may be provided between the negative bus 12 and the PCS. The first isolating switch QS1 and the second isolating switch QS2 may be used to control the on and off of the circuit. A first fuse FU1 may be provided between the positive bus 11 and the PCS, and a second fuse FU2 may be provided between the negative bus 12 and the PCS. The first fuse FU1 and the second fuse FU2 may be used as short-circuit protection devices.

[0056] like Figure 2 As shown, in a possible implementation, a first isolating switch QS1 and a first fuse FU1 are provided between the positive bus 11 and the PCS, and the first isolating switch QS1 and the first fuse FU1 are connected in series between the positive bus 11 and the PCS. Specifically, a first end of the first isolating switch QS1 is connected to the PCS, a second end of the first isolating switch QS1 is connected to a first end of the first fuse FU1, and a second end of the first fuse FU2 is connected to the positive bus 11.

[0057] like Figure 2 As shown, in a possible implementation, a second isolating switch QS2 and a second fuse FU2 are provided between the negative bus 12 and the PCS, and the second isolating switch QS2 and the second fuse FU2 are connected in series between the negative bus 12 and the PCS. Specifically, a first end of the second isolating switch QS2 is connected to the PCS, a second end of the second isolating switch QS2 is connected to a first end of the second fuse FU2, and a second end of the second fuse FU2 is connected to the negative bus 12.

[0058] like Figure 2 As shown, the auxiliary power supply system includes an incoming line 13, a first AC bus 14, a first power supply line and a second power supply line. The first end of the incoming line 13 is connected to an AC power source, and the second end of the incoming line 13 is connected to the first AC bus 14. The first end of the first power supply line is connected to the first AC bus 14, and the second end of the first power supply line is connected to the high voltage box (HVB) of multiple battery cabinets 2, and the first power supply line is used to supply power to multiple HVBs. The first end of the second power supply line is connected to the first AC bus 14, and the second end of the second power supply line is connected to the liquid cooling unit (Liquid Cooling Unit) of multiple battery cabinets 2, and the second power supply line is used to supply power to multiple liquid cooling units. Among them, the first AC bus 14 can be used to shunt the current output by the AC power source.

[0059] like Figure 2As shown, the first power supply line includes an isolation transformer T, a UPS second AC bus 15 and a plurality of first outgoing lines 16. The isolation transformer T and the UPS are arranged between the first AC bus 14 and the second AC bus 15, and the isolation transformer T and the UPS are connected in series. Specifically, the first end of the isolation transformer T is connected to the first AC bus 14, the second end of the isolation transformer T is connected to the first end of the UPS, and the second end of the UPS is connected to the second AC bus 15. The first end of each first outgoing line 16 is connected to the second AC bus 15, and the second end of each first outgoing line 16 is connected to the corresponding high-voltage box. The isolation transformer T is arranged in the junction cabinet to meet the conversion of different power supply formats. For example, the isolation transformer T can convert a voltage of 480V into a voltage of 220V. The UPS is arranged in the junction cabinet to meet the power supply requirements of the backup power supply of the fire protection and control system. Among them, the second AC bus 15 can be used to shunt the current output by the UPS.

[0060] like Figure 2 As shown, the second power supply circuit includes a plurality of second outgoing lines 17 , a first end of each second outgoing line 17 is connected to the first AC bus 14 , and a second end of each second outgoing line 17 is connected to a corresponding liquid cooling unit.

[0061] like Figure 2 As shown, a first circuit breaker QF1 is provided on the incoming line. Specifically, the first circuit breaker QF1 is provided between the AC power source and the first AC bus 14 .

[0062] like Figure 2 As shown, each first outgoing line is provided with a second circuit breaker QF2. Specifically, the second circuit breaker QF2 is provided between the second AC bus 15 and the corresponding high-voltage box.

[0063] like Figure 2 As shown, a third circuit breaker QF3 is provided on each second outgoing line 17. Specifically, the third circuit breaker QF3 is provided between the first AC bus 14 and the corresponding liquid cooling unit.

[0064] like Figure 2 As shown, a fourth circuit breaker QF4 is provided between the first AC bus 14 and the isolation transformer T, and a fifth circuit breaker QF5 is provided between the isolation transformer T and the UPS.

[0065] In an embodiment of the present application, in an auxiliary power supply system, multiple circuit breakers are arranged on the input and output lines of the auxiliary power supply circuit to provide short circuit and overload protection.

[0066] like Figure 2As shown, the battery cabinet 2 includes a battery cluster 21, a HVB and a liquid cooling unit. The first positive connector B+ of the HVB is connected to the positive electrode of the battery cluster 21 through a power cable, and the first negative connector B- of the HVB is connected to the negative electrode of the battery cluster 21 through a power cable. The second positive connector P+ of the HVB is connected to the positive bus 11 through a power cable, and the second negative connector P- of the HVB is connected to the negative bus 12 through a power cable. Thus, the main circuit of the DC side is formed.

[0067] like Figure 2 As shown, the battery cluster 21 may include a plurality of battery packs (PACK) 211 connected in series, and each battery pack 211 may include a plurality of single cells connected in series. That is, a plurality of battery packs 211 connected in series may constitute the battery cluster 21, and a plurality of single cells connected in series may constitute the battery pack 211. For example, Figure 2 As shown, eight battery packs 211 are connected in series to form a battery cluster 21, and the rated capacity of the battery cluster 21 is 344 kWh, wherein 48 single cells are connected in series to form a battery pack 211, and the voltage of the single cell is 3.2 V and the capacity is 280 Ah. Figure 2 As shown, each battery pack 211 may include a battery management unit (BMU), which has the functions of collecting information such as battery cell voltage and battery temperature and performing active balancing management and thermal management within the battery pack.

[0068] like Figure 2As shown, the HVB may include a battery cluster management unit (BCU) and a plurality of electrical components. The plurality of electrical components may include a third fuse FU3, a fourth fuse FU4, a first contactor KM1, a second contactor KM2, a third contactor KM3, a resistor R, a third isolating switch QS3, and a fourth isolating switch QS4. The first end of the third isolating switch QS3 is connected to the second positive connector P+, the second end of the third isolating switch QS3 is connected to the first end of the resistor R and the first end of the second contactor KM2, the second end of the second contactor KM2 is connected to the first end of the third fuse FU3, and the second end of the third fuse FU3 is connected to the first positive connector B+. The first end of the fourth isolating switch QS4 is connected to the second negative connector P-, the second end of the fourth isolating switch QS4 is connected to the first end of the third contactor KM3, the second end of the third contactor KM3 is connected to the first end of the fourth fuse FU4, and the second end of the fourth fuse FU4 is connected to the first negative connector B-. The second end of the resistor R is connected to the first end of the first contactor KM1, and the second end of the first contactor KM1 is connected to the second end of the second contactor KM2 and the first end of the third fuse FU3. The resistor R and the first contactor KM1 form a pre-charge circuit, the third isolating switch QS3, the second contactor KM2 and the third fuse FU3 form a main positive circuit, and the fourth isolating switch QS4, the third contactor KM3 and the fourth fuse FU4 form a main negative circuit.

[0069] like Figure 2 As shown in the figure, the BCU can be responsible for the voltage and current collection of the battery cluster, summarize the voltage and temperature information of the single battery in the cluster, execute the equalization strategy judgment and battery fault diagnosis function, realize the local protection and relay control of the battery cluster according to the battery fault information, insulation collection function and other state calculation functions. The HVB can manage and protect the operating status of the entire battery cluster.

[0070] like Figure 2 As shown, the power supply terminal A of the HVB is connected to the auxiliary power supply system, and the power supply terminal B of the liquid cooling unit is connected to the auxiliary power supply system. Specifically, the second end of the first outgoing line 16 is connected to the power supply terminal A of the HVB in the corresponding battery cabinet 2; the second end of the second outgoing line 17 is connected to the power supply terminal B of the liquid cooling unit in the corresponding battery cabinet 2. Figure 2As shown, the combiner cabinet 1 is provided with a plurality of first outgoing wires 16, each of which corresponds to a battery cabinet 2, and the second end of the first outgoing wire 16 is connected to the HVB in the corresponding battery cabinet 2, so that the auxiliary power supply system of the combiner cabinet 1 can supply power to the HVB; the combiner cabinet 1 is provided with a plurality of second outgoing wires 17, each of which corresponds to a battery cabinet 2, and the second end of the second outgoing wire 17 is connected to the liquid cooling unit in the corresponding battery cabinet 2, so that the auxiliary power supply system of the combiner cabinet 1 can supply power to the liquid cooling unit. Figure 2 As shown, the liquid cooling unit can control the charging and discharging temperature of the battery, so that the battery has good heat dissipation efficiency, heat dissipation speed and temperature uniformity.

[0071] In the technical solution provided in the embodiment of the present application, the energy storage system includes a junction box and multiple battery cabinets. The junction box includes a DC bus and an auxiliary power supply system. The multiple battery cabinets are connected in parallel to the DC bus of the junction box, so that when a battery cabinet catches fire, the connection between the battery cabinet and the junction box can be cut off in time, thereby preventing the junction box and other battery cabinets from being affected by the fire, thereby avoiding losses.

[0072] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A combiner cabinet, It is characterized in that include: DC bus and auxiliary power supply system; The DC bus is connected to an energy storage converter, and the DC bus is also connected to a plurality of battery cabinets connected in parallel; The auxiliary power supply system is connected to a power supply, and the auxiliary power supply system is also connected to a plurality of battery cabinets; The auxiliary power supply system is used to supply power to the plurality of battery cabinets.

2. The combiner cabinet according to claim 1, It is characterized in that The DC bus includes a positive bus and a negative bus; A first isolating switch and a first fuse are provided between the positive bus and the energy storage converter, and the first isolating switch and the first fuse are connected in series between the positive bus and the energy storage converter; A second isolating switch and a second fuse are provided between the negative bus and the energy storage converter. The second isolating switch and the second fuse are connected in series between the negative bus and the energy storage converter.

3. The combiner cabinet according to claim 1, It is characterized in that The auxiliary power supply system includes an incoming line, a first AC bus, a first power supply line, and a second power supply line; The first end of the incoming line is connected to an AC power source, and the second end of the incoming line is connected to the first AC bus; A first end of the first power supply line is connected to the first AC bus, a second end of the first power supply line is connected to a plurality of high-voltage boxes of the battery cabinets, and the first power supply line is used to supply power to the plurality of high-voltage boxes; A first end of the second power supply line is connected to the first AC bus, a second end of the second power supply line is connected to liquid cooling units of a plurality of the battery cabinets, and the second power supply line is used to supply power to the plurality of the liquid cooling units.

4. The combiner cabinet according to claim 3, It is characterized in that The first power supply circuit includes an isolation transformer, an uninterruptible power supply, a second AC bus and a plurality of first outgoing lines; The isolation transformer and the uninterruptible power supply are arranged between the first AC bus and the second AC bus, and the isolation transformer and the uninterruptible power supply are connected in series; A first end of each of the first outgoing lines is connected to the second AC busbar, and a second end of each of the first outgoing lines is connected to the corresponding high-voltage box.

5. The combiner cabinet according to claim 3, It is characterized in that The second power supply circuit includes a plurality of second outgoing lines; A first end of each of the second outgoing lines is connected to the first AC bus, and a second end of each of the second outgoing lines is connected to the corresponding liquid cooling unit.

6. The combiner cabinet according to claim 3, It is characterized in that A first circuit breaker is arranged on the incoming line.

7. The combiner cabinet according to claim 4, It is characterized in that A second circuit breaker is provided on each of the first outgoing lines.

8. The combiner cabinet according to claim 5, It is characterized in that A third circuit breaker is provided on each of the second outgoing lines.

9. An energy storage system, It is characterized in that It comprises the combiner cabinet as claimed in any one of claims 1 to 8 and a plurality of battery cabinets.

10. The energy storage system according to claim 9, It is characterized in that The battery cabinet includes a battery cluster, a high-voltage box and a liquid cooling unit, and the DC bus includes a positive bus and a negative bus; The first positive connector of the high-voltage box is connected to the positive electrode of the battery cluster through a power cable, and the first negative connector of the high-voltage box is connected to the negative electrode of the battery cluster through a power cable; The second positive connector of the high-voltage box is connected to the positive busbar through a power cable, and the second negative connector of the high-voltage box is connected to the negative busbar through a power cable; The power supply end of the high-voltage box is connected to the auxiliary power supply system; The power supply end of the liquid cooling unit is connected to the auxiliary power supply system.

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