AC / DC power distribution system integrated energy storage high-voltage box

Abstract

The invention relates to the technical field of energy storage high-voltage boxes, in particular to an alternating current and direct current power distribution system integrated energy storage high-voltage box which comprises a shell, an alternating current loop, a direct current loop, an intermediate relay and a battery management system are integrated in the shell, and the battery management system comprises a switching power supply and a secondary master control BPU control chip. The direct current loop comprises a battery positive connector and a battery negative connector; the alternating current loop comprises a first alternating current contactor, an alternating current molded case circuit breaker, a first input connector and a second input connector, so that after photovoltaic power is consumed in the daytime, due to the fact that the electric quantity of a battery cluster is large, stable power supply is kept for resident loads at night; at the moment, the battery cluster is inverted through an external PCS energy storage inverter and then is connected into a power grid through a loop of an input connector to discharge the power grid, and once the mains supply is cut off, the alternating current input is cut off, and power is supplied to equipment through a switching power supply. According to the invention, the commercial power outage system can still keep running.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage high-voltage boxes, and more particularly to an energy storage high-voltage box integrated with an AC / DC power distribution system. Background Art

[0002] In order to cope with the continuous access of a high proportion of renewable energy power generation and power electronic equipment (such as charging piles and other high-power equipment) to the power grid, the power system faces systemic power quality risks, and the distribution network urgently needs to improve its carrying capacity.

[0003] In existing battery energy storage systems (BESS), individual battery clusters require independent high-voltage boxes and power distribution systems, resulting in a complex system structure, low space utilization, and high wiring costs. Furthermore, high-voltage boxes account for a disproportionate proportion of the energy storage cabinet, leading to resource redundancy and increased costs. Furthermore, existing high-voltage boxes typically draw power from the grid alone to operate. If the grid loses power, the high-voltage boxes cease functioning, putting the battery energy storage system at risk of outage.

[0004] Therefore, it is particularly important to design a high-voltage energy storage box with a simple structure, higher integration, lower cost, higher space utilization, convenient production and installation, and the ability to keep the system running when the mains power is cut off. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an energy storage high-voltage box integrated with an AC / DC power distribution system, which has a simple structure, higher integration, reduced cost, higher space utilization, convenient production and installation, and can keep the system running when the mains power is cut off.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: an energy storage high-voltage box integrated with an AC / DC power distribution system, comprising a shell, wherein the AC circuit, the DC circuit, several intermediate relays and a battery management system for controlling the operation of the entire battery cluster are integrated in the shell, the battery management system is connected to the battery cluster, the battery management system includes a switching power supply and a secondary master BPU control chip for managing battery data and protecting the DC side, the secondary master BPU The control chip controls the relay coil to be closed when the system is fault-free, thereby outputting direct current. The DC circuit includes a battery positive connector for connecting to the positive electrode of the battery cluster and a battery negative connector for connecting to the negative electrode of the battery cluster. The AC circuit includes an AC contactor 1, an AC molded case circuit breaker, and two input connectors 1 and 2 for connecting to the AC400V mains. The input connector 1 is used for load discharge, and the input connector 2 is used to charge the battery cluster. After consuming photovoltaic power during the day, the battery cluster has a large amount of power, and ultimately maintains stable power supply to the residential load at night. By opening the circuit of the input connector 1, the battery cluster is inverted by an external PCS energy storage inverter and then connected to the power grid through the circuit of the input connector 1, discharging to the grid, that is, supplying power to the residential load. Once the mains power is cut off, the AC input is disconnected, and the equipment is powered by the DC / DC switching power supply.

[0007] Preferably, the battery management system further comprises a total positive relay, a DC molded case circuit breaker, a total negative relay, a miniature circuit breaker, a PCS connector and a negative loop shunt; the PCS connector is connected to the ABCN of the PCS energy storage inverter via a wire; the battery positive connector connects the positive loop fuse, the positive loop fuse, the total positive relay and the DC molded case circuit breaker in series through a copper busbar, and finally connects the positive pole of the DC molded case circuit breaker to the output positive connector on the side of the shell, so as to facilitate access to the positive pole P+ of the PCS energy storage inverter; the battery negative connector connects the negative loop shunt, the total negative relay and the DC molded case circuit breaker in series through a copper busbar, and finally connects the negative pole of the DC molded case circuit breaker to the output negative connector on the side of the shell, and the output negative connector is used to connect to the negative pole P- of the PCS energy storage inverter; The input 1 connector connects the AC contactor 1, inductor, and AC molded case circuit breaker in series via a copper busbar, passes through the input terminal of the AC molded case circuit breaker, and finally connects to the PCS energy storage inverter via a wire through the PCS connector. The input 2 connector is connected to one end of the AC contactor 2 via a copper busbar, and the other end of the AC contactor 2 is connected in parallel in front of the input terminal of the AC molded case circuit breaker to form a parallel circuit. Pin 1 of miniature circuit breaker 1 is connected in parallel to the second end of the positive circuit fuse via a wire, pin 3 of miniature circuit breaker 1 is connected to the first end of the main negative relay via a wire, pin 2 of miniature circuit breaker 1 is connected to the positive input terminal of the switching power supply via a wire, and pin 4 of miniature circuit breaker 1 is connected to the negative input terminal of the switching power supply via a wire. The switching power supply converts the battery voltage into 24V DC power through a DC voltage converter, and the positive and negative output terminals of the switching power supply are connected to the terminal block via wire connectors. The switching power supply provides 24V voltage to the terminal block, and the terminal block is used to connect to other connectors and devices to provide 24V voltage to the corresponding devices. The intermediate relays include intermediate relay 1 for controlling the on or off of AC contactor 1, intermediate relay 2 for controlling the on or off of AC contactor 2, intermediate relay 3 for controlling the on or off of the AC molded case circuit breaker to forcibly disconnect the AC circuit, and intermediate relay 6 for controlling the forced disconnection of miniature circuit breaker 1.

[0008] Preferably, in order to realize the energy storage status display, the intermediate relay also includes an intermediate relay four and an intermediate relay five, wherein the intermediate relay one is connected to the coil of the AC contactor one through a wire, and the later external EMS energy management system is connected to the intermediate relay one through the output of the EMS energy management system to control the intermediate relay one so that the coil of the AC contactor one is attracted, thereby making the first end and the second end of the AC contactor one conductive; the intermediate relay two is connected to the coil of the AC contactor two through a wire, and the later external EMS energy management system is connected to the intermediate relay two through the output of the EMS energy management system to control the intermediate relay two so that the coil of the AC contactor two is attracted, thereby making the first end and the second end of the AC contactor two conductive; the intermediate relay three is connected to the coil of the AC molded case circuit breaker through a wire, and the later external EMS energy management system is connected to the intermediate relay three through the EMS The output of the energy management system controls intermediate relay three, causing the coil of the AC molded case circuit breaker to energize, thereby forcibly disconnecting the AC circuit; intermediate relay four is connected in parallel to intermediate relay three through a wire, and one end of intermediate relay four is connected to an external emergency stop button. By triggering the external emergency stop button, it achieves the same function as intermediate relay three, causing the coil of the AC molded case circuit breaker to energize, thereby forcibly disconnecting the AC circuit; intermediate relay five is connected to the DC power supply connector on the side of the shell through a wire, so that the external EMS energy management system controls the status of the external indicator light, thereby indicating the status of the energy storage system; the DC power supply connector is used to power DC equipment, intermediate relay six is ​​connected to the coil of miniature circuit breaker one through a wire, and the battery management system controls intermediate relay six by controlling the output to control the coil of miniature circuit breaker one to energize, thereby forcibly disconnecting miniature circuit breaker one.

[0009] Preferably, in order to improve the safety of the entire circuit, the positive circuit fuse is used to protect the DC circuit. When the current on the DC circuit exceeds the protection current of the fuse, the current exceeds the fuse and the connection with the battery cluster will be cut off in time to avoid damage to equipment or components due to excessive current. The total positive relay and the total negative relay are both used to control the circuit conduction of the DC circuit, wherein the total positive relay and the total negative relay both include a first end and a second end; the first end of the total positive relay and the positive circuit fuse are connected through a copper busbar, and the second end of the total positive relay is connected to the DC molded case circuit breaker through a copper busbar. The DC molded case circuit breaker also includes a first end and a second end, and the positive and negative poles of the DC molded case circuit breaker are used for connector relays and output connectors. The operating handle 1 of the DC molded case circuit breaker is set on the side of the shell for manually controlling the on and off of the DC circuit; the operating handle 2 on the AC molded case circuit breaker is set on the side of the shell for manually controlling the on and off of the DC circuit. AC contactor 1 and AC contactor 2 are used to control the circuit conduction of the AC circuit.

[0010] Preferably, in order to avoid the impact caused by excessive current due to too small internal resistance and further improve the safety of equipment use, the battery management system also includes a pre-charging relay and a pre-charging resistor, which are connected in series to the first end and the second end of the total positive relay. The pre-charging relay and the pre-charging resistor both include a first end and a second end. The first end of the pre-charging relay and the first end of the total positive relay are connected in parallel through a wiring harness, the second end of the pre-charging relay and the first end of the pre-charging resistor are connected in series through a wiring harness, and the second end of the pre-charging resistor and the second end of the total positive relay are connected in parallel through a wiring harness, so that the pre-charging relay, the pre-charging resistor and the total positive relay form a parallel circuit, which is used to protect the positive and negative poles of the battery cluster from the impact caused by excessive current due to too small internal resistance of the DC circuit during initial power-on.

[0011] Preferably, to realize the communication function of data, the AC contactor 1 and the AC contactor 2 both include a first end and a second end, the AC molded case circuit breaker includes a first end and a second end, the first end of the AC contactor 1 is connected to the input 1 connector, the second end of the AC contactor 1 is connected to the first end of the AC molded case circuit breaker, the first end of the AC contactor 2 is connected to the input 2 connector, the second end of the AC contactor 2 is connected in parallel on the copper busbar behind the second end of the AC contactor 1, and the copper busbar in front of the first end of the AC molded case circuit breaker is also connected to a miniature circuit breaker 2, the other end of the miniature circuit breaker 2 is connected to a surge protector, and the other end of the surge protector is grounded, a miniature circuit breaker 3 is connected between the first end of the AC contactor 2 and the input 2 connector through a wire, and the other end of each miniature circuit breaker 3 is respectively connected to the liquid cooler power supply connector and the AC power supply connector and finally connected to an external device through a wire, the inductor is used to detect voltage and current and upload them to the energy storage meter, and finally upload them to the EMS energy management system through communication.

[0012] Preferably, in order to display the current status of the battery cluster, the side of the shell is also provided with a battery cluster communication connector, a device communication connector, a debugging connector, a control connector and an indicator light. The battery management system is connected to the battery cluster communication connector through a wire, and the battery management system is connected to the device communication connector through a wire. The device communication connector is later connected to various other devices through wires to transmit data. The battery management system is connected to the debugging connector through a wire, and debugging operations can be performed by connecting an external debugging device and the debugging connector. The battery management system is connected to the indicator light through a wire to control the status of the indicator light, switching between red and green, thereby indicating the current status of the battery cluster.

[0013] Preferably, the housing is a frame structure consisting of a top plate, side walls and a bottom plate; the input 1 connector, input 2 connector, battery cluster communication connector, device communication connector, debugging connector, control connector and indicator light are all arranged on the side wall.

[0014] Compared with the existing technology, the present invention achieves the following technical effects: this structure integrates more components into a high-voltage box by integrating DC side and AC side power distribution in the shell, ensuring high integration, further reducing the number of components of the equipment, improving space utilization, and the internal components are simpler and more convenient for production and installation. In addition, the system can continue to operate once the mains power is cut off. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional diagram of an energy storage high-voltage box integrated with an AC / DC power distribution system in Example 1; Figure 2 1 is a top view of an energy storage high-voltage box integrated with an AC / DC power distribution system in Example 1; Figure 3 This is a front view of an energy storage high-voltage box integrated with an AC / DC power distribution system in Example 1; Figure 4 Schematic diagram of the internal structure of the housing in Example 1; Figure 5 This is a top view of the housing in Example 1 when no partition is installed inside; Figure 6 This is a rear view of an energy storage high-voltage box integrated with an AC / DC power distribution system in Example 1; Figure 7 Schematic diagram of the circuit connection structure of the battery management system in Example 1; Figure 8 yes Figure 7 A magnified view of point A; Figure 9 yes Figure 7 Enlarged view of point C; Figure 10 for Figure 7 Enlarged view of point B; Figure 11 Connect the AC circuit with AC contactor 2, miniature circuit breaker 3, liquid cooler power connector, and AC power connector; Figure 12 This is a schematic diagram of the interface connections of each intermediate relay; Figure 13 This is a diagram showing the interface connection of the DC power supply connector; Figure 14 This is the interface connection diagram of XT1; Figure 15 This is a diagram of the interface connection of XT2; Figure 16 This is the interface connection diagram of the intermediate relay 1; Figure 17 This is the interface connection diagram of the intermediate relay 2; Figure 18 This is the interface connection diagram of AC contactor 1; Figure 19 This is the interface connection diagram of AC contactor 2; Figure 20 This is a schematic diagram of the interface connection of the control connector; Figure 21 This is a circuit connection diagram for the AC circuit.

[0016] Among them: housing 10, top plate 11, side wall 12, bottom plate 13, partition 20, AC circuit 30, DC circuit 40, battery management system 50, PCS energy storage inverter 60, secondary master BPU control chip 70, battery positive connector 1211, battery negative connector 1212, battery cluster communication connector 1213, debugging connector 1214, device communication connector 1215, liquid cooler power supply connector 1216, AC power supply connector 1217, input 1 connector 1218, input 2 connector 1219, energy storage meter 1221, miniature circuit breaker 1 1222, operating handle 1 1223, indicator light 1224, miniature circuit breaker 3 1226, output negative connector 1231, output positive connector 1232, DC power supply connector 1233, control connector 12 34. PCS connector 1235, switching power supply 123, AC contactor 1 131, inductor 132, surge protector 133, AC molded case circuit breaker 134, AC contactor 2 135, terminal block 292, main positive relay 21, positive circuit fuse 22, negative circuit shunt 23, main negative relay 24, DC molded case circuit breaker 25, pre-charge resistor 27, pre-charge relay 28, intermediate relay 1 2911, intermediate relay 2 2912, intermediate relay 3 2913, intermediate relay 4 2914, intermediate relay 5 2915, intermediate relay 6 2916. DETAILED DESCRIPTION

[0017] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0018] Example 1: like Figures 1-21As shown, the embodiment discloses an energy storage high-voltage box integrated with an AC / DC power distribution system, including a shell, wherein the shell 10 integrates an AC circuit 30, a DC circuit 40, several intermediate relays, and a battery management system 50 for controlling the operation of the entire battery cluster. The battery management system 50 is connected to the battery cluster, and the battery management system 50 includes a switching power supply 123 and a secondary master BPU control chip 70 for managing battery data and protecting the DC side. The secondary master BPU control chip 70 is a Ligao BP63D31. The control chip 70 controls the corresponding relay coil to be energized when the system is fault-free, thereby outputting DC power. The DC circuit 40 includes a battery positive connector 1211 for connecting to the positive electrode of the battery cluster and a battery negative connector 1212 for connecting to the negative electrode of the battery cluster. The AC circuit 30 includes an AC contactor 131, an AC molded case circuit breaker 134, and two input connectors 1218 and 1219 for connecting to AC400V mains power. The input connector 1218 is used for load discharge, and the input connector 1219 is used for connecting to the negative electrode of the battery cluster. The device 1219 is used to charge the battery cluster. After consuming photovoltaic power during the day, the battery cluster has a large amount of power, which can ultimately be used to maintain a stable power supply for residential loads at night. By opening the circuit of the input connector 1218, the battery cluster is inverted by the external PCS energy storage inverter 60 and then connected to the power grid through the circuit of the input connector 1218, discharging to the grid, that is, supplying power to the residential loads. Once the mains power is cut off, the AC input is disconnected, and the DC / DC switching power supply 123 is used to power the device. The secondary master BPU control chip 70 described in this embodiment; The battery management system 50 also includes a total positive relay 21 (electronic component symbol KM1), a DC molded case circuit breaker 25 (electronic component symbol QF1), a total negative relay 24 (electronic component symbol KM3), a miniature circuit breaker 1222 (electronic component symbol QF5), a PCS connector 1235 and a negative circuit shunt 23; the PCS connector 1235 is connected to the ABCN of the external PCS energy storage inverter 60 through a wire; the battery positive connector 1211 connects the positive circuit fuse 22 and the positive circuit fuse 23 through a copper busbar. The breaker 22, the main positive relay 21, and the DC molded case circuit breaker 25 are connected in series, and finally connected to the output positive connector 1232 on the side of the housing 10 through the positive pole of the DC molded case circuit breaker 25, so as to facilitate access to the positive pole P+ of the PCS energy storage inverter 60; the battery negative connector 1212 connects the negative circuit shunt 23, the main negative relay 24, and the DC molded case circuit breaker 25 in series through a copper busbar, and finally connected to the output negative connector 1231 on the side of the housing 10 through the negative pole of the DC molded case circuit breaker 25. The output negative connector 1231 is used to access the negative pole P- of the PCS energy storage inverter 60; Input 1 connector 1218 connects AC contactor 131, inductor 132, and AC molded case circuit breaker 134 in series via a copper busbar. The connection then passes through the input terminal of the AC molded case circuit breaker 134 and is finally connected to the PCS energy storage inverter 60 via a wire through PCS connector 1235. Input 2 connector 1219 is connected to one end of AC contactor 2 135 via a copper busbar. The other end of AC contactor 2 135 is connected in parallel in front of the input terminal of the AC molded case circuit breaker 134, forming a parallel circuit. Pin 1 of miniature circuit breaker 1222 (electronic component symbol QF5) is connected in parallel to the second terminal of positive circuit fuse 22 via a wire. Pin 3 of miniature circuit breaker 1222 is connected to the first terminal of main negative relay 24 via a wire. Pin 2 of miniature circuit breaker 1222 is connected to the positive input terminal of switching power supply 123 via a wire. Pin 4 of miniature circuit breaker 1222 is connected to the negative input terminal of switching power supply 123 via a wire. Switching power supply 123 converts the battery voltage into 24V DC power through DC voltage conversion. The positive and negative output terminals of switching power supply 123 are connected to terminal block 292 via wire connectors. The switching power supply 123 provides 24V voltage to terminal block 292. Terminal block 292 is also used to connect to other connectors and devices to provide 24V voltage to the corresponding devices. The intermediate relays include an intermediate relay 1 2911 (electronic component symbol KA1) for controlling the on or off of the AC contactor 131, an intermediate relay 2 2912 (electronic component symbol KA2) for controlling the on or off of the AC contactor 2 135, an intermediate relay 3 2913 (electronic component symbol KA3) for controlling the on or off of the AC molded case circuit breaker 134 to forcibly disconnect the AC circuit 30, and an intermediate relay 6 2916 (electronic component symbol KA6) for controlling the forced disconnection of the miniature circuit breaker 1222.

[0019] Preferably, in order to realize the energy storage status display, the intermediate relay also includes an intermediate relay 4 2914 (the electronic component symbol is represented by KA4) and an intermediate relay 5 2915 (the electronic component symbol is represented by KA5), wherein the intermediate relay 1 2911 is connected to the coil of the AC contactor 131 through a wire, and the later external EMS energy management system (the EMS corresponding pins involved in each relay in the figure need to be connected to the corresponding pins of the external EMS energy management system. Since the EMS energy management system is a capacity management system, it is responsible for managing the energy scheduling and system protection of the entire system; the pins are signal feedback and control functions) is connected to the intermediate relay 1 2911. The output of the EMS energy management system controls the intermediate relay 1 2911 so that the coil of the AC contactor 131 is attracted, thereby making the first end and the second end of the AC contactor 131 conductive; the intermediate relay 2912 is connected to the coil of the AC contactor 2 135 through a wire, and the later external EMS energy management system is connected to the intermediate relay 2912 through the EMS The output of the energy management system controls the intermediate relay 2912, so that the coil of the AC contactor 2 135 is energized, thereby connecting the first and second ends of the AC contactor 2 135; the intermediate relay 3 2913 is connected to the coil of the AC molded case circuit breaker 134 through a wire, and the external EMS energy management system is later connected to the intermediate relay 3 2913. The output of the EMS energy management system controls the intermediate relay 3 2913 through the output of the EMS energy management system, so that the coil of the AC molded case circuit breaker 134 is energized, thereby forcibly disconnecting the AC circuit 30; the intermediate relay 4 2914 is connected in parallel with the intermediate relay 3 2913 through a wire, and one end of the intermediate relay 4 2914 is externally connected to an external emergency stop button. By triggering the external emergency stop button, the same function as the intermediate relay 3 2913 is achieved, so that the coil of the AC molded case circuit breaker 134 is energized, thereby forcibly disconnecting the AC circuit 30; the intermediate relay 5 2915 is connected to the DC power supply connector 1233 on the side of the shell 10 through a wire, so as to realize the external EMS The energy management system controls the status of the external indicator lights, thereby indicating the status of the energy storage system. The DC power supply connector 1233 is used to power the DC equipment. The intermediate relay 2916 is connected to the coil of the miniature circuit breaker 1222 via a wire. The battery management system 50 controls the intermediate relay 2916 by outputting a control to close the coil of the miniature circuit breaker 1222, forcing the miniature circuit breaker 1222 to open. In this embodiment, in order to facilitate quick plugging and realize fast power supply to the device in the later stage, the XT1 terminal block and the XT2 terminal block are added. Figure 14 and Figure 15As shown, the XT1 terminal block is used to provide a DC24V voltage, ultimately providing 24V power supply and 24V control operation to the device; the XT2 terminal block provides an AC220V voltage, used to provide 220V power supply and 220V control operation to the device; and the connection relationship between the pins of the XT1 terminal block and the XT2 terminal block is referenced. Figure 14 and Figure 15 ,by Figure 15 In the example, pin 1 on the upper row of the XT2 terminal block will be connected to QF4:5 later. The symbol QF4 in front represents the symbol of the electronic component, and the number behind it indicates the pin number of the electronic component. QF4 is miniature circuit breaker 1226, so QF4:5 means that pin 5 of miniature circuit breaker 1226 needs to be connected later. The connection methods of other pins on the XT2 terminal block and the XT1 terminal block can be connected according to the above method.

[0020] Preferably, in order to improve the safety of the entire circuit, the positive circuit fuse 22 is used to protect the DC circuit 40. When the current on the DC circuit 40 exceeds the protection current of the fuse 22, the fuse 22 will promptly cut off the connection with the battery cluster to avoid damage to equipment or components due to excessive current. The total positive relay 21 and the total negative relay 24 are both used to control the circuit conduction of the DC circuit 40, wherein the total positive relay 21 and the total negative relay 24 each include a first end and a second end; the first end of the total positive relay 21 and the positive circuit fuse 22 are connected by a copper busbar, and the total positive relay 21 The second end is connected to the DC molded case circuit breaker 25 through a copper busbar. The DC molded case circuit breaker 25 also includes a first end and a second end, and the positive and negative poles of the DC molded case circuit breaker 25 are used for the connector relay and the output connector. The operating handle 1223 of the DC molded case circuit breaker 25 is set on the side of the shell 10 for manually controlling the on and off of the DC circuit 40; the operating handle 2 1228 on the AC molded case circuit breaker 134 is set on the side of the shell 10 for manually controlling the on and off of the DC circuit 30, and the AC contactor 1 131 and the AC contactor 2 135 are used to control the circuit conduction of the AC circuit 30.

[0021] Preferably, in order to avoid the impact caused by excessive current due to too small internal resistance and further improve the safety of equipment use, the battery management system 50 also includes a pre-charge relay 28 and a pre-charge resistor 27, which are connected in series to the first end and the second end of the total positive relay 21. The pre-charge relay 28 and the pre-charge resistor 27 both include a first end and a second end. The first end of the pre-charge relay 28 and the first end of the total positive relay 21 are connected in parallel through a wiring harness, the second end of the pre-charge relay 28 and the first end of the pre-charge resistor 27 are connected in series through a wiring harness, and the second end of the pre-charge resistor 27 and the second end of the total positive relay 21 are connected in parallel through a wiring harness, so that the pre-charge relay 28, the pre-charge resistor 27 and the total positive relay 21 form a parallel circuit, which is used to protect the positive and negative poles of the battery cluster from the impact caused by excessive current due to too small internal resistance of the DC circuit 40 during initial power-on.

[0022] As a preferred embodiment, to realize the communication function of data, the AC contactor 1 131 (electronic component symbol KM4) and the AC contactor 2 135 both include a first end and a second end, the AC molded case circuit breaker 134 includes a first end and a second end, the first end of the AC contactor 131 is connected to the input connector 1218, the second end of the AC contactor 131 is connected to the first end of the AC molded case circuit breaker 134, the first end of the AC contactor 2 135 is connected to the input connector 1219, the second end of the AC contactor 2 135 (electronic component symbol KM5) is connected in parallel to the copper bus after the second end of the AC contactor 131, and the copper bus before the first end of the AC molded case circuit breaker 134 (electronic component symbol QF2) is also connected to the miniature circuit breaker 2 1227 ( The other end of the second miniature circuit breaker 1227 is connected to a surge protector 133 (electronic component symbol: SPD), the other end of which is grounded. A third miniature circuit breaker 1226 (electronic component symbol: QF4) is connected between the first end of the second AC contactor 135 and the second input connector 1219 via a wire. The other end of each third miniature circuit breaker 1226 is connected to the liquid cooler power connector 1216 (electronic component symbol: COM1) and the AC power connector 1217 (electronic component symbol: COM2), and finally to external devices via wires. The inductor 132 is used to detect voltage and current and upload them to the energy storage meter 1221, and finally to the EMS energy management system via 485 communication.

[0023] Preferably, in order to display the current status of the battery cluster, the side of the housing 10 is further provided with a battery cluster communication connector 1213 (electronic component symbol represented by J2), a device communication connector 1215 (electronic component symbol represented by J1), a debugging connector 1214 (electronic component symbol represented by J3), a control connector 1234 (electronic component symbol represented by COM4) and an indicator light 1224. The battery management system 50 is connected to the battery cluster communication connector 1213 via a wire, and the control connector 1234 is later connected to the EMS energy management system of an external device to achieve automatic control. The battery management system 50 is connected to the device communication connector 1215 via a wire. The device communication connector 1215 is later connected to various other devices via wires to transmit data. The battery management system 50 is connected to the debug connector 1214 via a wire. An external debug device can be connected to the debug connector 1214 to perform debugging operations. The battery management system 50 is connected to the indicator light 1224 via a wire to control the state of the indicator light 1224, switching between red and green to indicate the current state of the battery cluster. The pin definitions for the battery cluster communication connector 1213, the device communication connector 1214, and the debug connector 1214 are shown in the following table: The definitions of the 16 pins of the DC power connector 1233 from left to right are as follows: The definitions of the 16 pins of the control connector 1234 from left to right are as follows: Preferably, the housing 10 is a frame-like structure consisting of a top plate 11, side walls 12, and a bottom plate 13. Input 1 connector 1218, input 2 connector 1219, battery cluster communication connector 1213, device communication connector 1215, debug connector 1214, control connector 1234, and indicator light 1224 are all located on the side wall 12. The energy storage high-voltage box integrates components such as fuses, relays, shunts, resistors, and a battery management system into a single box. It connects the external battery cluster and PCS energy storage inverter 60, controlling the charging and discharging process of the entire battery cluster and ensuring system safety and stability.

[0024] When the present invention is working, the first input connector 1218 and the second input connector 1219 are connected to the AC400V mains electricity. The first input connector 1218 is used for load discharge, and the second input connector 1219 is used for photovoltaic absorption, that is, charging the battery. The charging principle is as follows: during the day, the photovoltaic inverter discharges, and at the same time, the contactor of the input 2 connector 1219 circuit opens, and the circuit is connected. At this time, the power generated by the photovoltaic inverter (existing structure) passes through the input 2 circuit and is rectified by the PCS energy storage inverter 60 to charge the battery. The specific working principle is as follows: after consuming photovoltaic power during the day, the battery cluster in the energy storage system has a large amount of power. At night, it is used to maintain a stable power supply for residential loads. The circuit of the input 1 connector 1218 is opened. At this time, the battery is inverted by the PCS energy storage inverter 60 (the PCS energy storage inverter 60 is an external device and is installed outside the device) and then connected to the grid through the circuit of the input 1 connector 1218, discharging to the grid, that is, supplying power to the residential loads. Once the mains power is cut off, the AC input is disconnected, and power is supplied to the BMS chip and the external EMS energy management system through the DC / DC switching power supply 123 to maintain operational capabilities. The PCS energy storage inverter 60 switches to off-grid mode to supply power to local loads. Therefore, the energy storage high-voltage box involved in this structure is integrated in the form of DC side and AC side power distribution, integrating more components into one high-voltage box, ensuring high integration, further reducing the number of components of the equipment, improving space utilization, and the internal components are simpler and more convenient for production and installation. In addition, the system can still maintain operation once the mains power is cut off.

[0025] It should be noted that how the BMS chip realizes control belongs to conventional technology in this field, and the EMS energy management system and PCS energy storage inverter 60 both belong to conventional technology of high-voltage control system, so they are not described in detail.

[0026] Of course, the above are only specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement falls within the scope of protection of the present invention.

Claims

1. An energy storage high-voltage box integrated with an AC / DC power distribution system, comprising a housing (10), characterized in that: The housing (10) is integrated with an AC circuit (30), a DC circuit (40), a plurality of intermediate relays, and a battery management system (50) for controlling the operation of the entire battery cluster. The battery management system (50) is connected to the battery cluster and includes a switching power supply (123) and a secondary master control BPU for managing battery data and protecting the DC side. The control chip (70) comprises a DC circuit (40) including a battery positive connector (1211) for connecting to the positive electrode of the battery cluster and a battery negative connector (1212) for connecting to the negative electrode of the battery cluster. The AC circuit (30) comprises an AC contactor (131), an AC molded case circuit breaker (134), and two input connectors (1218) and (1219) for accessing AC400V mains power. The input connector (1218) is used for load discharge, and the input connector (1219) is used for charging the battery cluster. After consuming photovoltaic power during the day, the battery cluster has a large amount of power, and thus can be used to maintain stable power supply to the resident load at night. By opening the circuit of the input connector (1218), the battery cluster is inverted by the external PCS energy storage inverter (60) and then connected to the power grid through the circuit of the input connector (1218), discharging to the power grid, that is, supplying power to the resident load. Once the mains power is cut off, the AC input is disconnected, and power is supplied to the device through the switching power supply (123).

2. According to the AC / DC power distribution system integrated energy storage high-voltage box of claim 1, the battery management system (50) further comprises a total positive relay (21), a DC molded case circuit breaker (25), a total negative relay (24), a miniature circuit breaker (1222), a PCS connector (1235) and a negative loop shunt (23); the PCS connector (1235) is connected to the ABCN of the external PCS energy storage inverter (60) through a wire; the battery positive connector (1211) is connected to the positive loop fuse (22), the positive loop fuse (22), the total positive relay (21), the DC molded case circuit breaker (25), the total negative relay (24), the miniature circuit breaker (1222), the PCS connector (1235) and the negative loop shunt (23); the PCS connector (1235) is connected to the ABCN of the external PCS energy storage inverter (60) through a copper busbar; The DC molded case circuit breaker (25) is connected in series, and finally connected through the positive pole of the DC molded case circuit breaker (25) and the output positive connector (1232) on the side of the housing (10), so as to facilitate access to the positive pole P+ of the PCS energy storage inverter (60); the battery negative connector (1212) connects the negative circuit shunt (23), the total negative relay (24), and the DC molded case circuit breaker (25) in series through the copper busbar, and finally connected through the negative pole of the DC molded case circuit breaker (25) and the output negative connector (1231) on the side of the housing (10), and the output negative connector (1231) is used to access the negative pole P- of the PCS energy storage inverter (60); The input connector (1218) connects the AC contactor (131), the inductor (132), and the AC molded case circuit breaker (134) in series through a copper busbar, passes through the input end of the AC molded case circuit breaker (134), and finally uses a wire and connects to the PCS energy storage inverter (60) through the PCS connector (1235); the input connector (1219) is connected to one end of the AC contactor (135) through a copper busbar, and the other end of the AC contactor (135) is connected in parallel to the front side of the input end of the AC molded case circuit breaker (134), forming a parallel circuit; Pin 1 of the miniature circuit breaker (1222) is connected in parallel to the second end of the positive circuit fuse (22) through a wire, pin 3 of the miniature circuit breaker (1222) is connected to the first end of the total negative relay (24) through a wire, pin 2 of the miniature circuit breaker (1222) is connected to the input positive pole of the switching power supply (123) through a wire, and pin 4 of the miniature circuit breaker (1222) is connected to the input negative pole of the switching power supply (123) through a wire. The switching power supply (123) converts the battery voltage into 24V DC power through DC voltage conversion. The output positive / negative poles of the switching power supply (123) are connected to the terminal block (292) through a wire connector. The switching power supply (123) provides 24V voltage to the terminal block (292), and the terminal block (292) is used to connect other connectors and devices to provide 24V voltage to the corresponding device. The intermediate relays include an intermediate relay 1 (2911) for controlling the on / off of the AC contactor 1 (131), an intermediate relay 2 (2912) for controlling the on / off of the AC contactor 2 (135), an intermediate relay 3 (2913) for controlling the on / off of the AC molded case circuit breaker (134) to realize forced disconnection of the AC circuit (30), and an intermediate relay 6 (2916) for controlling the forced disconnection of the miniature circuit breaker 1 (1222).

3. The energy storage high-voltage box integrated with an AC / DC power distribution system according to claim 2, characterized in that: The intermediate relay further comprises an intermediate relay four (2914) and an intermediate relay five (2915), wherein the intermediate relay one (2911) is connected to the coil of the AC contactor one (131) via a wire, and the EMS energy management system connected externally thereafter is connected to the intermediate relay one (2911) and controls the intermediate relay one (2911) via the output of the EMS energy management system so that the coil of the AC contactor one (131) is attracted, thereby making the first end and the second end of the AC contactor one (131) conductive; the intermediate relay two (2912) is connected to the coil of the AC contactor two (135) via a wire, and the EMS energy management system connected externally thereafter is connected to the intermediate relay two (2912) and controls the intermediate relay two (2912) via the output of the EMS energy management system so that the coil of the AC contactor two (135) is attracted, thereby making the first end and the second end of the AC contactor two (135) conductive; the intermediate relay three (2913) is connected to the coil of the AC molded case circuit breaker (134) via a wire, and the EMS energy management system connected externally thereafter is connected to the intermediate relay one (2911) and controls the intermediate relay one (2911) via the output of the EMS energy management system so that the coil of the AC contactor two (135) is attracted, thereby making the first end and the second end of the AC contactor two (135) conductive; The energy management system is connected to the intermediate relay three (2913) and controls the intermediate relay three (2913) through the output of the EMS energy management system, so that the coil of the AC molded case circuit breaker (134) is attracted, thereby forcibly disconnecting the AC circuit (30); the intermediate relay four (2914) is connected in parallel with the intermediate relay three (2913) through a wire, and one end of the intermediate relay four (2914) is externally connected to an external emergency stop button. By triggering the external emergency stop button, the same function as the intermediate relay three (2913) is achieved, so that the coil of the AC molded case circuit breaker (134) is attracted, thereby forcibly disconnecting the AC circuit (30); the intermediate relay five (2915) is connected to the DC power supply connector (1233) on the side of the housing (10) through a wire to achieve the external EMS The energy management system controls the status of the external indicator light, thereby indicating the status of the energy storage system; the DC power supply connector (1233) is used to supply power to the DC device, the intermediate relay six (2916) is connected to the coil of the miniature circuit breaker one (1222) through a wire, and the battery management system (50) controls the intermediate relay six (2916) by controlling the output to achieve the control of the coil of the miniature circuit breaker one (1222) to be attracted, so that the miniature circuit breaker one (1222) is forced to be disconnected.

4. The energy storage high-voltage box integrated with an AC / DC power distribution system according to claim 2 or 3, characterized in that: The positive circuit fuse (22) is used to protect the DC circuit (40). When the current on the DC circuit (40) exceeds the protection current of the fuse (22), the current exceeds the fuse (22) and the connection with the battery cluster is promptly cut off to avoid damage to equipment or components due to excessive current. The total positive relay (21) and the total negative relay (24) are both used to control the circuit conduction of the DC circuit (40), wherein the total positive relay (21) and the total negative relay (24) both include a first end and a second end; the first end of the total positive relay (21) and the positive circuit fuse (22) are connected through a copper busbar, and the second end of the total positive relay (21) is connected through the copper busbar and The DC molded case circuit breaker (25) is connected, and the DC molded case circuit breaker (25) also includes a first end and a second end, and the positive and negative poles of the DC molded case circuit breaker (25) are used for the connector relay and the output connector; the operating handle 1 (1223) of the DC molded case circuit breaker (25) is set on the side of the housing (10) and is used to manually control the on and off of the DC circuit (40); the operating handle 2 (1228) on the AC molded case circuit breaker (134) is set on the side of the housing (10) and is used to manually control the on and off of the DC circuit 30, and the AC contactor 1 (131) and the AC contactor 2 (135) are used to control the circuit conduction of the AC circuit (30).

5. The energy storage high-voltage box integrated with an AC / DC power distribution system according to claim 2 or 3, characterized in that: The battery management system (50) further includes a pre-charge relay (28) and a pre-charge resistor (27), wherein the pre-charge relay (28) and the pre-charge resistor (27) are connected in series to the first end and the second end of the total positive relay (21), and the pre-charge relay (28) and the pre-charge resistor (27) both include a first end and a second end, the first end of the pre-charge relay (28) and the first end of the total positive relay (21) are connected in parallel via a wiring harness, the second end of the pre-charge relay (28) and the first end of the pre-charge resistor (27) are connected in series via a wiring harness, and the second end of the pre-charge resistor (27) and the second end of the total positive relay (21) are connected in parallel via a wiring harness, thereby forming a parallel circuit between the pre-charge relay (28), the pre-charge resistor (27) and the total positive relay (21), for protecting the positive and negative electrodes of the battery cluster from an impact caused by excessive current due to excessive internal resistance of the DC circuit (40) when initially powered on.

6. The energy storage high-voltage box integrated with an AC / DC power distribution system according to claim 2 or 3, characterized in that: The AC contactor 1 (131) and the AC contactor 2 (135) both include a first end and a second end, and the AC molded case circuit breaker (134) includes a first end and a second end. The first end of the AC contactor 1 (131) is connected to the input 1 connector (1218), the second end of the AC contactor 1 (131) is connected to the first end of the AC molded case circuit breaker (134), the first end of the AC contactor 2 (135) is connected to the input 2 connector (1219), the second end of the AC contactor 2 (135) is connected in parallel to the copper busbar behind the second end of the AC contactor 1 (131), and a miniature breaker is also connected to the copper busbar before the first end of the AC molded case circuit breaker (134). Circuit breaker 2 (1227), the other end of the miniature circuit breaker 2 (1227) is connected to a surge protector (133), the other end of the surge protector (133) is grounded, the first end of the AC contactor 2 (135) and the input 2 connector (1219) are connected to a miniature circuit breaker 3 (1226) via a wire, the other end of each miniature circuit breaker 3 (1226) is respectively connected to the liquid cooler power supply connector (1216), the AC power supply connector (1217) and finally connected to an external device via a wire, the inductor (132) is used to detect the voltage and current and upload them to the energy storage meter (1221), and finally upload them to the EMS energy management system via 485 communication.

7. The energy storage high-voltage box integrated with an AC / DC power distribution system according to claim 2 or 3, characterized in that: The side of the housing (10) is further provided with a battery cluster communication connector (1213), a device communication connector (1215), a debugging connector (1214), a control connector (1234) and an indicator light (1224). The battery management system (50) is connected to the battery cluster communication connector (1213) via a wire, and the battery management system (50) is connected to the device communication connector (1215) via a wire. The device communication connector (1215) is later connected to various other devices via a wire for data transmission. The battery management system (50) is connected to the debugging connector (1214) via a wire, and debugging operations can be performed by connecting an external debugging device to the debugging connector (1214). The battery management system (50) is connected to the indicator light (1224) via a wire, and is used to control the state of the indicator light (1224), switching between red and green, thereby indicating the current state of the battery cluster.

8. The energy storage high-voltage box integrated with an AC / DC power distribution system according to claim 7, characterized in that: The housing (10) is a frame-shaped structure consisting of a top plate (11), side walls (12), and a bottom plate (13); an input 1 connector (1218), an input 2 connector (1219), a battery cluster communication connector (1213), a device communication connector (1215), a debugging connector (1214), a control connector (1234), and an indicator light (1224) are all arranged on the side wall (12).

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