High-voltage control box

Abstract

The utility model discloses a high-voltage control box, which comprises a box body, a power supply control unit and a charging and discharging transmission unit, the power supply control unit and the charging and discharging transmission unit are mounted in the box body from top to bottom; the power supply control unit comprises a first shell, a switching power supply assembly mounted in the first shell and a main control board; the charging and discharging transmission unit comprises a second shell, and a negative electrode circuit assembly and a positive electrode circuit assembly which are mounted in the second shell from bottom to top; according to the high-voltage control box, the power supply control unit and the charging transmission unit are divided into two parts which are arranged up and down, and the positive electrode circuit assembly and the negative electrode circuit assembly of the charging transmission unit are also divided into two parts, so that the high-voltage control box is compact in structure; more importantly, mutual interference between electric appliance elements between the power supply control unit and the charging transmission unit is reduced, signals of a positive electrode circuit assembly and signals of a negative electrode circuit assembly in the charging transmission unit are mutually isolated, and wiring is more reasonable.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric power equipment, and in particular relates to a high-voltage control box. Background Art

[0002] At present, battery energy storage systems play an irreplaceable role in the power generation side, transmission and distribution side, and user side. They have a wide range of application scenarios and are one of the important means to solve the problem of renewable energy grid connection and consumption. The main function of the high-voltage control box of the energy storage system is to control the connection or disconnection of the main electrical circuit of the system. The high-voltage control box of the energy storage system is the management unit of the battery cluster, providing charge and discharge control for the battery cluster, power-on control for external high-voltage components, and responsible for collecting the voltage, current, temperature and other information of the batteries in the battery cluster and uploading them in a package, realizing battery overload short-circuit protection, high-voltage sampling, low-voltage control and other functions, and protecting and monitoring the operation of the high-voltage system.

[0003] How to design a high-voltage control box with compact structure, low cost and less interference between electrical components is an urgent problem that needs to be solved in this field. Summary of the invention

[0004] The utility model aims to provide a high-voltage control box with compact structure, low cost and less interference between electrical components.

[0005] The high-voltage control box is used for energy storage equipment, which includes a temperature control system, a fire protection system, a UPS, a converter and at least one battery cluster; the improvement thereof is:

[0006] The high-voltage control box includes a box body, a power supply control unit and a charge-discharge transmission unit; the power supply control unit and the charge-discharge transmission unit are installed in the box body from top to bottom;

[0007] The power supply control unit includes a first housing, a switching power supply assembly and a main control board;

[0008] The switch power supply assembly and the main control board are installed in the first housing;

[0009] The switching power supply assembly is used to supply power to the electrical equipment in the energy storage device; the charge-discharge transmission unit includes a second housing and a negative circuit assembly and a positive circuit assembly installed in the second housing from bottom to top; the negative circuit assembly is used to converge the N-way negative current signals of the total negative output of the battery cluster of the energy storage device and then divide them into M-way negative current signals, and the M-way negative current signals are led out of the charge-discharge transmission unit and transmitted to the converter modules corresponding to each way;

[0010] The positive circuit component is used to gather the N positive current signals of the total positive output of the battery cluster of the energy storage device and then divide them into M paths. The M positive current signals are led out of the charge and discharge transmission unit and transmitted to the converter modules corresponding to each path; N≥M≥2.

[0011] The utility model utilizes a box body to divide the power supply control unit and the charging transmission unit into two parts arranged upper and lower, and the positive circuit component and the negative circuit component in the charging transmission unit are also divided into two parts, so that the high-voltage control box is not only compact in structure, but more importantly, the mutual interference between the electrical components between the power supply control unit and the charging transmission unit is reduced. At the same time, the signals of the positive circuit component and the negative circuit component in the charging transmission unit are isolated from each other, and the wiring is more reasonable.

[0012] Furthermore, the first switching power supply is used to convert AC mains power into DC power to power the charger used for active balancing in the energy storage device; the second switching power supply is used to convert the high-voltage DC power of the battery cluster into 24V DC power for electrical components.

[0013] Since the battery cluster of the present invention uses active charging to achieve capacity balancing, in order to provide each charger with the required DC power, the present invention uses a first switching power supply that converts AC mains power into DC power. In order to ensure that some electrical components in the energy storage device are not powered off when the mains power is suddenly cut off, the present invention uses a second switching power supply that converts the high-voltage DC power of the battery cluster into 24V DC power, thereby improving the safety and reliability of the energy storage device.

[0014] Furthermore, the negative electrode circuit assembly includes a negative electrode converging unit, M negative electrode shunt units and a control acquisition circuit; the negative electrode converging unit converges N negative current signals of the battery cluster of the energy storage device, and then shunts them to M negative electrode shunt units; N≥M≥2; the control acquisition circuit includes a plurality of control acquisition areas; each control acquisition area is used to collect the current value and voltage value of the corresponding path, and control the on and off of the negative electrode circuit assembly;

[0015] The positive circuit assembly includes a confluence unit, M positive shunt units and an adapter circuit board; the positive confluence unit converges N positive current signals of the battery cluster of the energy storage device, and then shunts them to M positive shunt units; the adapter circuit board monitors the signal in each positive shunt unit through the first type of cable for interface conversion, and connects it to the control acquisition circuit with a second type of cable, thereby realizing the transmission of the signal of each positive shunt unit.

[0016] Since the current of the battery cluster is too large, the utility model gathers the current through the converging unit and then divides it through the negative pole shunting unit, and each path after shunting corresponds to a converter module, thereby ensuring that the current does not flow biased.

[0017] Furthermore, the negative current shunt unit comprises a negative contactor, a negative transmission plate, a current monitoring device and an insulating support column;

[0018] The negative contactor is used to control the on and off of the negative shunt unit;

[0019] One end of the negative transmission plate is connected to the negative contactor, and the other end is connected to the first negative interface corresponding to the circuit, so as to transmit the energy of the circuit to the converter module corresponding to the circuit;

[0020] The current monitoring device is used to measure the actual current size of the circuit in real time and transmit the battery value to the corresponding control acquisition area;

[0021] The insulating support column is used to insulate and support the negative electrode transmission plate in the second shell.

[0022] Furthermore, the positive current shunt unit comprises a positive contactor, a positive transmission plate, a fuse and an insulating support column;

[0023] The positive contactor is used to control the on and off of the positive current shunt unit;

[0024] One end of the positive transmission plate is connected to the positive contactor, and the other end is connected to the first positive interface corresponding to the circuit, so as to transmit the energy of the circuit to the converter module corresponding to the circuit;

[0025] The fuse is used to protect the circuit from overcurrent and overheating;

[0026] The insulating support column is used to insulate and support the positive electrode transmission plate in the second shell.

[0027] Furthermore, the above-mentioned busbar unit includes N first electrical connection pieces, a busbar and M second electrical connection pieces;

[0028] One end of the first electrical connecting piece is connected to the total negative of the battery cluster through the second negative electrode interface, and the other end of the first electrical connecting piece is connected to the busbar; one end of the second electrical connecting piece is connected to the busbar, and the other end of the second electrical connecting piece is connected to the negative electrode shunt unit.

[0029] Furthermore, the box body comprises a box door and a cabinet body; a display screen is provided on the box door;

[0030] Two supporting beams are respectively arranged in two opposite side walls of the cabinet, and the two supporting beams located at the upper side of the two side walls and having the same height are used to fix the power supply control unit, and the two supporting beams located at the lower side of the two side walls and having the same height are used to fix the charge and discharge transmission unit; and the two side walls are provided with a porous structure for heat dissipation;

[0031] A first through hole for connecting to the total positive and total negative of the battery cluster of the energy storage device, and a second through hole for connecting to the electrical equipment of the energy storage device are provided on the side wall of the cabinet away from the box body;

[0032] A third through hole is provided at the bottom of the cabinet for connecting the charge-discharge transmission unit and the converter in the energy storage device.

[0033] Furthermore, the first housing comprises a first housing including a first top cover and a first outer shell with an open top, and the first top cover is mounted to the open end of the first outer shell by means of screw connection;

[0034] An AC interface, a main switch, an indicator light, a surge protector, a surge backup protector, a positive and negative communication interface, and a display interface are arranged on the side wall of the first housing close to the box door;

[0035] A first interface, a second interface, a third interface, a UPS output interface, a UPS power supply interface and a fourth interface on a side wall of the first housing away from the box door;

[0036] Furthermore, heat dissipation holes are arranged on the other two side walls of the first housing.

[0037] Furthermore, the second housing comprises a second top cover and a second outer shell with an open top, and the second top cover is mounted to the open end of the second outer shell by screw connection;

[0038] The side wall of the second housing close to the box door is provided with M converter communication interfaces, M first positive electrode interfaces, M first negative electrode interfaces and a cascade communication interface;

[0039] N second positive electrode interfaces and N second negative electrode interfaces are arranged on the side wall of the second shell away from the box door;

[0040] Fans are arranged on the other two side walls of the second shell.

[0041] Furthermore, the negative circuit assembly and the positive circuit assembly are respectively insulated and fixed in the second shell through a tray assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Schematic diagram of high voltage control box Figure 1 ;

[0043] Figure 2 Schematic diagram of high voltage control box Figure 2 ;

[0044] Figure 3 It is a schematic diagram of the cabinet in the high voltage control box;

[0045] Figure 4 This is the appearance diagram of the power supply control unit;

[0046] Figure 5 Schematic diagram of the power supply control unit Figure 1 ;

[0047] Figure 6 Schematic diagram of the power supply control unit Figure 2 ;

[0048] Figure 7 The appearance of the charge and discharge transmission unit Figure 1 ;

[0049] Figure 8 The appearance of the charge and discharge transmission unit Figure 2 ;

[0050] Fig. 9 is a schematic diagram of a negative electrode circuit component;

[0051] Fig.10 is a schematic diagram of a positive circuit assembly;

[0052] Fig.11 A schematic diagram of a tray assembly.

[0053] The reference numerals are as follows:

[0054] 100-high voltage control box;

[0055] 1-box body, 11-box door, 12-cabinet body, 121-support beam, 13-display screen, 14-first through hole, 15-second through hole, 16-third through hole;

[0056] 2-power supply control unit, 21-switching power supply assembly, 211-first switching power supply, 212-second switching power supply, 22-main control board, 23-first shell, 231-first top cover, 232-first shell, 233-heat dissipation hole; 3-charge and discharge transmission unit, 31-negative circuit assembly, 311-negative bus unit, 3111-first electrical connection piece, 3112-bus, 3113-second electrical connection piece, 3114-insulating support seat, 312-negative shunt unit, 3121-negative contactor, 3122-negative transmission plate, 3123- Current monitoring device, 3124-insulating support column, 313-control acquisition circuit, 3131-substrate, 3132-communication cable, 3133-control acquisition area, 32-positive circuit assembly, 321-positive current confluence unit, 322-positive current shunt unit, 3221-positive contactor, 3222-positive transmission plate, 3223-fuse, 323-adapter circuit board, 33-second shell, 331-second top cover, 332-second shell, 34-tray assembly, 341-fixed plate, 342-insulating plate, 343-threading hole, 35-blower;

[0057] 4-Porous structure. DETAILED DESCRIPTION

[0058] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0059] In the description of the present application, it should be understood that the terms longitudinal, transverse, length, width, thickness, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] This embodiment provides a high-voltage control box for an energy storage device;

[0063] In this embodiment, the energy storage device includes at least one battery cluster, a converter, a fire protection system, a temperature control system, a UPS (uninterruptible power supply) and a high-voltage box;

[0064] The battery cluster includes A battery packs arranged from top to bottom, each battery pack is connected in series, and the battery pack includes B large-capacity batteries arranged side by side and connected in series; the large-capacity battery is composed of N battery cells connected in parallel, N is greater than or equal to 2, and the N battery cells are in the same electrolyte system, the positive poles of the N battery cells are connected as the positive pole of the large-capacity battery, and the negative poles of the N battery cells are connected as the negative pole of the large-capacity battery;

[0065] In some other embodiments, multiple battery modules can be placed side by side in the battery pack, each battery module is composed of N battery cells connected in parallel, and the N battery cells do not share electrolyte; the positive poles of the N battery cells are connected to serve as the positive pole of the battery module, and the negative poles of the N battery cells are connected to serve as the negative pole of the battery module.

[0066] Taking the energy storage device composed of large-capacity batteries as an example, when the energy storage device has a battery cluster, the positive electrode of the large-capacity battery on the far right of the top battery pack of the battery cluster is used as the total positive of the battery cluster, and the negative electrode of the large-capacity battery on the far right of the bottom battery pack of the battery cluster is used as the total negative of the battery cluster;

[0067] The total positive and negative of the battery cluster are connected to the converter through the high-voltage control box.

[0068] When the battery cluster is charging, the converter needs to convert the AC power of the grid into the DC power required by the battery cluster; when the battery cluster is discharging, the converter needs to convert the DC power of the battery cluster into the AC power of the grid.

[0069] The converter may be a centralized converter or a string converter. Since the charge and discharge current of the battery cluster in this embodiment is relatively large, considering various indicators such as voltage, current and cost, and in order to avoid the problem of bias current or even circulating current when using a centralized converter, a string converter is selected in this embodiment; the string converter includes multiple converter modules;

[0070] In this embodiment, the temperature control system adopts active temperature control, including a heat exchange pipe network for exchanging heat with large capacity batteries, a flow valve, a pump, and a liquid cooler for providing circulating cooling medium to the heat exchange pipe network;

[0071] In some other embodiments, an air radiator may be added as a passive temperature control device for the energy storage device. By combining active liquid cooling and air passive heat dissipation, the heat dissipation effect is better.

[0072] In this embodiment, the fire protection system has two levels. The first level fire protection system is a system that actively processes the thermal runaway smoke of the large-capacity battery in at least one of the three ways of cooling, adsorption, and ignition after it is led out through the smoke pipeline (the thermal runaway smoke processed by this level of system does not overflow the smoke pipeline);

[0073] The second-level fire protection system is a system that suppresses the overflowing thermal runaway smoke by spraying fire protection medium after the thermal runaway smoke overflows the smoke pipe.

[0074] In some other embodiments, the above two-stage fire protection system can be used separately.

[0075] like Figures 1 to 3As shown, the high voltage control box 100 includes a box body 1, a power supply control unit 2 and a charge and discharge transmission unit 3;

[0076] The box body 1 includes a box door 11 and a cabinet body 12; the box door 11 is hinged on the cabinet body 12, and a display screen 13 is provided on the box door 11;

[0077] Two opposite side walls (such as Figure 3 Two support beams 121 are respectively arranged in the two side walls in the left and right directions, and the two support beams 121 located at the top of the two side walls and having the same height are used to place the power supply control unit 2, and the two support beams 121 located at the bottom of the two side walls and having the same height are used to place the charge and discharge transmission unit 3;

[0078] Furthermore, the two side walls are provided with porous structures 4 for heat dissipation;

[0079] like Figure 3 As shown, a first through hole 14 for connecting to the total positive and total negative of the battery cluster of the energy storage device, and a second through hole 15 for connecting to the electrical equipment of the energy storage device are provided on the side wall of the cabinet 12 away from the door;

[0080] The so-called electrical equipment in this embodiment mainly includes the charger in the active balancing control circuit; the liquid cooler, pump and flow valve of the temperature control system; the igniter, fan, alarm, various sensors and UPS in the fire protection system;

[0081] The bottom of the cabinet 12 is provided with a third through hole 16 for connecting the charge-discharge transmission unit 3 and the converter in the energy storage device.

[0082] like Figures 4 to 6 As shown, the power supply control unit 2 includes a switching power supply component 21, a main control board 22 and a first housing 23;

[0083] The switch power supply assembly 21 and the main control board 22 are installed in the first housing 23;

[0084] Specifically, the switching power supply assembly 21 includes a first switching power supply 211 and a second switching power supply 212;

[0085] The function of the first switch power supply 211 is to convert the AC mains power introduced by the AC interface into DC power for powering the charger used by the active charging equalization circuit in the energy storage device. Its working mode is: AC to DC mode. The number of first power supplies is determined by the number of chargers used when the large-capacity battery in the energy storage device performs active equalization control. In this embodiment, four first power supplies are arranged side by side in the first housing.

[0086] The working mode of the second switching power supply 212 is: its working mode is: DC / DC mode, which converts the high-voltage direct current of the battery cluster in the energy storage device into 24V direct current, and then supplies power to the energy storage device and the electrical components in the high-voltage box that require 24V direct current;

[0087] Specifically, the first housing 23 includes a first top cover 231 and a first outer shell 232 with an open top, and the first top cover 231 is mounted to the open end of the first outer shell 232 by screw connection;

[0088] An AC interface (A1), a main switch (A2), an indicator light (A3), a surge protector (A4), a surge backup protector (A5), a positive and negative communication interface (A6) and a display interface (A7) are provided on the side wall of the first housing 232 near the box door;

[0089] The AC interface (A1) is used to introduce AC power from the mains into the power supply control unit;

[0090] The function of the surge protector (A4) is to prevent the surge from damaging the equipment when the AC power introduced by the AC interface suddenly generates a peak current or voltage due to external interference. The surge backup protector (A5) is used to protect the surge protector.

[0091] The positive and negative electrode communication interface (A6) is used to realize the communication between the charge and discharge transmission unit and the power supply control unit;

[0092] The display screen interface (A7) is used to connect to the display screen of the box door;

[0093] A first interface (B1), a second interface (B2), a third interface (B3), a UPS output interface (B4), a UPS power supply interface (B5) and a fourth interface (B6) are provided on the side wall of the first housing 232 away from the box door;

[0094] The number of the first interface (B1) and the first switching power supply is consistent, and is used to lead the electrical signal of the first switching power supply out of the power supply control unit for use by the charger in the active balancing control circuit;

[0095] The second interface (B2) is used to lead the electrical signal of the second switching power supply out of the power supply control unit for use by electrical components in the fire protection system and the electrical components in the high-voltage control box;

[0096] The third interface (B3) is used to directly lead the alternating current introduced by the AC interface out of the power supply control unit for use by the temperature control system in the energy storage device;

[0097] The UPS power supply interface (B5) is used to directly lead the AC power introduced by the AC interface (A1) out of the power supply control unit for use by the UPS;

[0098] The UPS output interface (B4) is used to supply the electrical signal of the UPS to the electrical components in the fire protection system of the energy storage device through the fourth interface (B6).

[0099] The first housing 23 is provided with heat dissipation holes on two side walls perpendicular to the box door;

[0100] The main control board is fixed to the bottom of the first shell through an insulating plate;

[0101] The functions of the main control board mainly include: battery cluster charge and discharge control function, temperature control system control function, data collection and filtering function; various status monitoring and alarm functions; SOC, SOH, SOE and other parameter calculation functions;

[0102] like Figures 7 to 11 As shown, the charge-discharge transmission unit 3 includes a negative circuit assembly 31, a positive circuit assembly 32 and a second housing 33;

[0103] The positive circuit assembly 32 and the negative circuit assembly 31 are arranged in the second housing 33 from bottom to top;

[0104] The negative circuit component 31 is used to gather the N negative current signals of the total negative output of the battery cluster of the energy storage device and then divide them into M negative current signals. The M negative current signals are led out of the charge and discharge transmission unit and then transmitted to the converter modules corresponding to each of the two negative current signals.

[0105] like Fig. 9 As shown, the negative circuit assembly 31 includes a negative current converging unit 311, M negative current shunting units 312 and a control collection circuit 313; the negative current converging unit 311 converges N negative current signals of the battery cluster of the energy storage device, and then shuns them to M negative current shunting units 312;

[0106] Specifically, the negative electrode bus unit 311 includes a first electrical connection sheet 3111, a bus piece 3112, a second electrical connection sheet 3113 and an insulating support seat 3114;

[0107] Since the number of battery cells is N, the number of first electrical connectors 3111 is also N. One end of the first electrical connector 3111 is connected to the total negative pole of the battery cluster through the second negative electrode interface, and the other end of the first electrical connector 3111 is connected to the busbar 3112.

[0108] The number of the second electrical connection sheets 3113 is M, one end of the second electrical connection sheet 3113 is connected to the busbar 3112, the other end of the second electrical connection sheet 3113 is connected to one end of the negative shunt unit 312, and the other end of each negative shunt unit 312 is used to connect to the converter module corresponding to the line;

[0109] The two ends of the busbar 3112 are insulated and supported by the insulating support seat 3114 in the second housing 33;

[0110] Specifically, the negative current shunt unit 312 includes a negative contactor 3121, a negative transmission plate 3122, a current monitoring device 3123, and an insulating support column 3124;

[0111] The negative contactor 3121 is used to control the on and off of the negative current shunt unit; the parameter indicators of the negative contactor 3121 must at least meet the following requirements: the overcurrent of the negative contactor must at least meet the requirement of being greater than the charge and discharge current / M of the battery cluster, and the pressure-bearing capacity of the negative contactor must at least meet the requirement of being greater than the maximum discharge voltage of the battery cluster;

[0112] One end of the negative transmission plate 3122 is connected to the negative contactor 3121, and the other end is used to connect to the converter module corresponding to the circuit;

[0113] The current monitoring device 3123 is used to measure the actual current of the loop in real time, and transmit the battery value to the control acquisition area corresponding to the loop on the control acquisition circuit; the current monitoring device 3123 can use a Hall sensor, or a shunt;

[0114] The insulating support column 3124 is used to insulate and support the negative electrode transmission plate 3122 in the second shell 33;

[0115] The control collection circuit 313 includes a substrate 3131, a communication cable 3132, and a plurality of control collection areas 3133 arranged on the substrate 3131; each control collection area 3133 is used to collect the current value and voltage value of the corresponding path, and control the on and off of the path;

[0116] like Fig.10 As shown, the positive circuit assembly 32 includes a positive current converging unit 321, M positive current shunting units 322 and a switching circuit board 323; the positive current converging unit 321 converges N positive current signals of the battery cluster of the energy storage device, and then shuns them to the M positive current shunting units 322;

[0117] The voltage signal detected by the first type of cable in each positive shunt unit 322 is converted through the interface through the adapter circuit board 323, and connected to the control acquisition circuit through the second type of cable, thereby realizing the transmission of the signal of each positive shunt unit;

[0118] The structure and connection method of the positive busbar unit 321 used in the positive circuit assembly 32 are substantially consistent with the structure and connection method of the negative busbar unit 311 used in the negative circuit assembly 31;

[0119] Specifically, the positive current diversion unit 322 includes a positive contactor 3221, a positive transmission plate 3222, a fuse 3223, and an insulating support column 3124;

[0120] The positive contactor 3221 is used to control the on and off of the positive current diversion unit 322; the parameter index selection principle of the positive contactor 3221 is consistent with that of the negative contactor;

[0121] One end of the positive transmission plate 3222 is connected to the positive contactor, and the other end is used to connect to the converter module corresponding to the circuit;

[0122] Fuse 3223 is used to protect the circuit from overcurrent and overheating;

[0123] The insulating support column 3124 is used to insulate and support the positive transmission plate 3222 in the second shell 33;

[0124] Specifically, the second housing 33 includes a second top cover 331 and a second outer shell 332 with an open top, and the second top cover 331 is mounted to the open end of the second outer shell 332 by screw connection;

[0125] The side wall of the second housing 33 close to the housing door is provided with M converter communication interfaces (C1), M first positive electrode interfaces (C2), M first negative electrode interfaces (C3) and a cascade communication interface (C4);

[0126] Among them, the converter communication interface (C1) is used to realize the mutual transmission of signals between each control acquisition area and each inverter module; the first positive electrode interface (C2) is used to connect the positive electrode shunt unit with the positive electrode of the converter module corresponding to the path; the first negative electrode interface (C3) is used to connect the negative electrode shunt unit with the negative electrode of the converter module corresponding to the path; one end of the cascade communication interface (C4) is connected to the communication cable in the control acquisition circuit, and the other end of the cascade communication interface is connected to the positive and negative communication interface (A6) set on the power supply control unit through a transmission cable, thereby realizing the communication between the charge and discharge transmission unit 3 and the power supply control unit 2;

[0127] The side wall of the second housing 33 away from the box door is provided with N second positive electrode interfaces (D1) and N second negative electrode interfaces (D2);

[0128] The second positive electrode interface (D1) is used to connect the positive electrode bus unit to the total positive of the battery cluster; the second negative electrode interface (D2) is used to connect the negative electrode bus unit to the total negative of the battery cluster;

[0129] In this embodiment, the negative circuit assembly 31 is fixed in the second housing 33 by a tray assembly 34 and is located above the positive circuit assembly 32. In order to ensure installation reliability and safety, Fig.11As shown, the tray assembly 34 includes a fixing plate 341 for fixing the second shell 33 and an insulating plate 342 arranged above the fixing plate 341. In order to enable the voltage, current and other signals of the positive circuit assembly to be transmitted to the control acquisition circuit of the negative current assembly with the shortest cable, the fixing plate and the insulating plate area corresponding to each negative current shunt unit are provided with threading holes 343 for the cables to pass through;

[0130] The positive circuit assembly 32 is also fixed in the second housing 33 by a tray assembly 34. The difference from the negative tray assembly is that the tray assembly used by the positive circuit assembly does not require threading holes to be provided on the fixing plate and the insulating plate.

[0131] Since the current passing through the positive circuit assembly 32 and the negative circuit assembly 31 in the second shell 33 is relatively large, in order to reduce the problem of overheating of the internal electrical components, fans 35 are respectively provided on the two side walls of the second shell 33, thereby forming an air cooling channel in the second shell to fully cool the internal electrical components.

Claims

1. A high voltage control box for an energy storage device, the energy storage device comprising a temperature control system, a fire protection system, a UPS, a converter and at least one battery cluster; It is characterized in that The high-voltage control box includes a box body, a power supply control unit and a charge-discharge transmission unit; The power supply control unit and the charge and discharge transmission unit are installed in the box from top to bottom; The power supply control unit includes a first housing, a switching power supply assembly and a main control board; The switch power supply assembly and the main control board are installed in the first housing; The switching power supply assembly is used to supply power to the electrical equipment in the energy storage device; The main control board is used to monitor the battery cluster, temperature control system, fire protection system and UPS operation; The charge-discharge transmission unit includes a second housing and a negative circuit assembly and a positive circuit assembly installed in the second housing from bottom to top; The negative circuit component is used to gather the N negative current signals of the total negative output of the battery cluster of the energy storage device and then divide them into M negative current signals. The M negative current signals are led out of the charge and discharge transmission unit and then transmitted to the converter modules corresponding to each of the two negative current signals. The positive circuit component is used to gather the N positive current signals of the total positive output of the battery cluster of the energy storage device and then divide them into M paths. The M positive current signals are led out of the charge and discharge transmission unit and transmitted to the converter modules corresponding to each path; N≥M≥2.

2. A high voltage control box according to claim 1, characterized in that: The switching power supply assembly includes a first switching power supply and a second switching power supply; the first switching power supply is used to convert AC mains power into DC power to power the charger used for active balancing in the energy storage device; the second switching power supply is used to convert the high-voltage DC power of the battery cluster into 24V DC power to power electrical components.

3. A high voltage control box according to claim 1, characterized in that: The negative electrode circuit assembly includes a negative electrode current collecting unit, M negative electrode current dividing units and a control collection circuit; The negative electrode current converging unit converges the N negative current signals of the battery cluster of the energy storage device, and then divides them to the M negative electrode current dividing units; N ≥ M ≥ 2; The control acquisition circuit includes a plurality of control acquisition areas; each control acquisition area is used to collect the current value and voltage value of the corresponding circuit, and control the on and off of the negative circuit component; The positive circuit assembly includes a converging unit, M positive current shunt units and a transfer circuit board; The positive electrode current converging unit converges the N positive current signals of the battery cluster of the energy storage device, and then divides them to the M positive electrode current dividing units; The adapter circuit board performs interface conversion on the signal monitored by the first type of cable in each positive shunt unit, and connects it to the control acquisition circuit with the second type of cable, thereby realizing the transmission of the signal of each positive shunt unit.

4. A high voltage control box according to claim 3, characterized in that: The negative current shunt unit includes a negative contactor, a negative transmission plate, a current monitoring device and an insulating support column; The negative contactor is used to control the on and off of the negative shunt unit; One end of the negative transmission plate is connected to the negative contactor, and the other end is connected to the first negative interface corresponding to the circuit, so as to transmit the energy of the circuit to the converter module corresponding to the circuit; The current monitoring device is used to measure the actual current size of the circuit in real time and transmit the battery value to the corresponding control acquisition area; The insulating support column is used to insulate and support the negative electrode transmission plate in the second shell.

5. A high voltage control box according to claim 3, characterized in that: The positive shunt unit includes a positive contactor, a positive transmission plate, a fuse and an insulating support column; The positive contactor is used to control the on and off of the positive current shunt unit; One end of the positive transmission plate is connected to the positive contactor, and the other end is connected to the first positive interface corresponding to the circuit, so as to transmit the energy of the circuit to the converter module corresponding to the circuit; The fuse is used to protect the circuit from overcurrent and overheating; The insulating support column is used to insulate and support the positive electrode transmission plate in the second shell.

6. A high voltage control box according to any one of claims 2 to 5, characterized in that: The busbar unit includes N first electrical connection pieces, a busbar and M second electrical connection pieces; One end of the first electrical connection sheet is connected to the total positive or negative of the battery cluster, and the other end of the first electrical connection sheet is connected to the busbar; One end of the second electrical connection piece is connected to the busbar, and the other end of the second electrical connection piece is connected to the positive electrode shunt unit or the negative electrode shunt unit.

7. A high voltage control box according to claim 1, characterized in that: The box body includes a box door and a cabinet body; The cabinet door is hinged on the cabinet body, and a display screen is arranged on the cabinet door; Two supporting beams are respectively arranged in two opposite side walls of the cabinet, and the two supporting beams located at the upper side of the two side walls and having the same height are used to fix the power supply control unit, and the two supporting beams located at the lower side of the two side walls and having the same height are used to fix the charge and discharge transmission unit; and the two side walls are provided with a porous structure for heat dissipation; A first through hole for connecting to the total positive and total negative of the battery cluster of the energy storage device, and a second through hole for connecting to the electrical equipment of the energy storage device are provided on the side wall of the cabinet away from the box body; A third through hole is provided at the bottom of the cabinet for connecting the charge-discharge transmission unit and the converter in the energy storage device.

8. A high voltage control box according to claim 1, characterized in that: The first housing comprises a first top cover and a first outer shell with an open top, wherein the first top cover is mounted to the open end of the first outer shell by screw connection; An AC interface, a main switch, an indicator light, a surge protector, a surge backup protector, a positive and negative communication interface, and a display interface are arranged on the side wall of the first housing close to the box door; A first interface, a second interface, a third interface, a UPS output interface, a UPS power supply interface and a fourth interface on a side wall of the first housing away from the box door; Furthermore, heat dissipation holes are arranged on the other two side walls of the first housing.

9. A high voltage control box according to claim 1, characterized in that: The second housing comprises a second top cover and a second outer shell with an open top, wherein the second top cover is mounted to the open end of the second outer shell by screw connection; The side wall of the second housing close to the box door is provided with M converter communication interfaces, M first positive electrode interfaces, M first negative electrode interfaces and a cascade communication interface; N second positive electrode interfaces and N second negative electrode interfaces are arranged on the side wall of the second shell away from the box door; Fans are arranged on the other two side walls of the second shell.

10. A high voltage control box according to claim 1, characterized in that: The negative circuit assembly and the positive circuit assembly are respectively insulated and fixed in the second shell through a tray assembly.

Images