Installation and connection structure of secondary circuit of micro-grid battery energy storage integrated device

Abstract

The utility model discloses a mounting and connecting structure of a secondary circuit of a micro-grid battery energy storage integrated device. A machine frame is formed by welding a front plate, a rear panel, a right side plate, a left side plate, a right partition plate and a left partition plate; the machine frame is longitudinally divided into an alternating-current box, a converter box and a direct-current box by the right partition plate and the left partition plate; a middle partition plate is arranged in the converter box, the middle partition plate is short and welded to the rear panel, and the converter box is divided into an upper converter chamber, a lower converter chamber and a front converter chamber through the middle partition plate. The machine frame is provided with an upper cover plate and a lower cover plate; the power supply comprises a PCS secondary circuit box, a BMS secondary circuit box, an FMS secondary circuit box, a PMS secondary circuit box, an EMS secondary circuit box, an AC / DC direct current working power supply box and a DC / DC direct current working power supply box. According to the utility model, the secondary circuit in the PCS is separated, and the secondary circuit is modularized, so that the integration of the PCS, the BMS, the FMS, the PMS and the EMS for micro-grid battery energy storage can be simply and reliably realized with low cost.

Description

Technical Field

[0001] The utility model relates to an installation and connection structure for a secondary circuit of a microgrid battery energy storage comprehensive device. Background Art

[0002] The main function of battery energy storage equipment is to use batteries as the main body to store electricity when the grid has abundant or surplus energy and release electricity when the grid is short of energy. In other words, it can smooth the peak and fill the valley of grid electricity. It is widely used in wind power, solar power stations and electricity consumption scenarios with large peak and valley differences. It is a new energy industry that is an important component of the new power system.

[0003] Microgrid battery energy storage equipment generally adopts cabinet form, with a power of hundreds of kilowatts and stored electricity of hundreds of kilowatt-hours (kWh). It is a small and medium-sized energy storage device suitable for power regulation of industrial and commercial power users and public distribution stations.

[0004] In addition to batteries for storing energy, microgrid battery energy storage equipment also includes a PCS (bidirectional converter system) that converts grid AC power into DC power and battery DC power into AC power; a BMS (battery management system) that manages the safe and economical operation of the energy storage batteries; an FMS (fire management system) that manages the reliable operation of the energy storage batteries and the fire protection within the cabinet; a PMS (power management system) that manages the safe and reliable operation of the equipment's AC distribution power and DC operating power supply; and an EMS (electrical management system) that manages the safe and economical operation of the energy storage batteries, the equipment's stored and generated energy, and the distribution and supply of power. The BMS, FMS, PMS, EMS, and the PCS (C) controller within the PCS are low-voltage (micro-voltage), low-current (micro-current) secondary circuits, accounting for over 95% of the total components. A small portion also exists in interfaces with the primary circuit.

[0005] The PCS, BMS, FMS, PMS, and EMS in existing microgrid battery energy storage devices are all independently dispersed, or only partially integrated. As a result, the internal structure of the microgrid battery energy storage devices is complex, manufacturing and maintenance are difficult, and the reliability is poor and the cost is high.

[0006] Due to the complexity of the secondary circuits of PCS, BMS, FMS, PMS, and EMS (also known as 5S) in microgrid battery energy storage equipment, which are dependent on the primary circuits with large volume, heavy weight, high voltage, high current, high temperature rise, and large electromagnetic interference, as well as their sensitivity to temperature and electromagnetic compatibility, there is currently no device that integrates PCS, BMS, FMS, PMS, and EMS (5S) in microgrid battery energy storage equipment. Summary of the Invention

[0007] The purpose of the utility model is to provide a secondary circuit that can separate the secondary circuit in the PCS and modularize the secondary circuit, so as to realize the installation and connection structure of the secondary circuit of the microgrid battery energy storage comprehensive device that integrates the PCS, BMS, FMS, PMS, and EMS of the microgrid battery energy storage equipment.

[0008] The technical solution of this utility model is:

[0009] A secondary circuit installation and connection structure for a microgrid battery energy storage integrated device is characterized by comprising: a steel frame, the frame being welded together by a front panel, a rear panel, a right side panel, a left side panel, a right partition, and a left partition; the right partition and the left partition longitudinally dividing the frame into an AC box, a converter box, and a DC box; a middle partition within the converter box, the middle partition being relatively short and welded to the rear panel, and dividing the converter box into an upper converter chamber, a lower converter chamber, and a front converter chamber; and an upper cover and a lower cover.

[0010] There are PCS secondary circuit box, BMS secondary circuit box, FMS secondary circuit box, PMS secondary circuit box, EMS secondary circuit box, AC / DC direct current working power supply box, DC / DC direct current working power supply box; the PMS secondary circuit box is installed on the side of the AC box and fixed on the right side panel or right partition, the EMS secondary circuit box is installed on the side of the AC box and fixed on the right partition or right side panel, the BMS secondary circuit box is installed on the side of the DC box and fixed on the left side panel or left partition, the FMS secondary circuit box is installed on the side of the DC box and fixed on the left side panel or left partition, the PCS secondary circuit box is flat installed in the front lower part of the front chamber in the converter box, the AC / DC direct current working power supply box is installed on the side of the AC box and fixed on the right side panel or right partition, the DC / DC direct current working power supply box is installed on the side of the DC box and fixed on the left side panel or left partition, or is installed in the AC box and fixed on the right side panel or right partition.

[0011] There is a secondary circuit bus board, which is located at the front lower part of the front board and spans the AC box, converter box and DC box; there are no less than 15 external connection terminals on the outside of the secondary circuit bus board; there are bus board PCS connectors, bus board BMS connectors, bus board FMS connectors, bus board PMS connectors and bus board EMS connectors on the inside of the secondary circuit bus board; there are PCS box terminals on the PCS secondary circuit box, BMS box terminals on the BMS secondary circuit box, FMS box terminals on the FMS secondary circuit box, PMS box terminals on the PMS secondary circuit box and EMS box terminals on the EMS secondary circuit box. The MS box terminal, the AC / DC box terminal on the AC / DC working power supply box, and the DC / DC box terminal on the DC / DC working power supply box; the PCS box terminal, BMS box terminal, FMS box terminal, PMS box terminal, and EMS box terminal are respectively connected by cables to the bus board PCS connector, bus board BMS connector, bus board FMS connector, bus board PMS connector, and bus board EMS connector on the secondary circuit bus board, and the AC / DC box terminal and DC / DC box terminal are connected to the PMS box terminal; the external terminal is connected to the relevant terminals of the external device.

[0012] The AC box contains a primary AC circuit composed of interconnected AC primary components. The primary AC circuit contains AC input terminals, AC circuit breakers, and AC fuses. The PMS box terminals on the PMS secondary circuit box and the AC / DC box terminals on the AC / DC working power supply box have wires or cables connected to the primary AC circuit or to the AC interface on the primary AC circuit. The primary AC circuit is connected to the distribution grid. The PMS secondary circuit box manages power supply safety and reliable operation by collecting parameters of the primary AC circuit, and the AC / DC working power supply box obtains input energy from the primary AC circuit. The converter box contains a primary converter circuit composed of interconnected converter primary components. The primary converter circuit contains filter reactor components, energy storage capacitor components, and IGBT components. The PCS secondary circuit The PCS box terminals on the circuit box are connected to the primary converter circuit or the converter interface on the primary converter circuit via wires or cables. The PCS secondary circuit box converts the distribution AC power into DC power for battery storage and the battery DC power into AC power for injection into the distribution AC grid by collecting parameters and controlling the operating conditions of the primary converter circuit. The DC box contains a primary DC circuit consisting of interconnected DC components. This primary DC circuit includes DC input terminals, a DC circuit breaker, DC fuses, and DC relays. The BMS box terminals on the BMS secondary circuit box and the DC / DC box terminals on the DC / DC power supply box are connected to the primary DC circuit or the DC interface on the primary DC circuit. The primary DC circuit is connected to the energy storage battery. The BMS secondary circuit box collects parameters and controls the operating conditions of the primary DC circuit to ensure safe and economical operation of the energy storage battery and allows the DC / DC power supply box to receive input energy from the primary DC circuit.

[0013] A fire-fighting liquid storage tank is installed in the DC box, and a liquid spray connection nozzle is installed on the upper front part of the left side panel of the DC box. There is a liquid spray nozzle at one end of the fire-fighting liquid storage tank, and a liquid storage tank wiring is installed at the other end of the fire-fighting liquid storage tank; a liquid guide tube connects the liquid spray nozzle and the liquid spray connection nozzle; the liquid storage tank wiring is connected to the FMS box wiring terminal; when the FMS secondary circuit box receives fire accident information, the liquid storage tank is started through the FMS box wiring terminal and the liquid storage tank wiring to spray the fire-fighting liquid from the liquid spray nozzle through the liquid spray connection nozzle.

[0014] The utility model takes effective measures in the chassis structure of the device, separating the secondary circuit in the PCS, and modularizing and bus-connecting the secondary circuits, so as to realize the integration of the PCS, BMS, FMS, PMS, and EMS (5S) of the microgrid battery energy storage equipment. The formed 5S integrated device of the microgrid battery energy storage equipment has a simple and reasonable structure, low cost, and reliable operation. After being used in the microgrid battery energy storage equipment, the device has a simple structure, reliable operation, simple production and maintenance, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 It is a front plan view of an embodiment of the utility model.

[0017] Figure 2 It is a rear view of an embodiment of the utility model.

[0018] Figure 3 yes Figure 1 AA view of the .

[0019] Reference numerals:

[0020] 001—Frame

[0021] 002—Front panel

[0022] 003—Rear Panel

[0023] 004—Right side panel

[0024] 005—Left side panel

[0025] 006—Right bulkhead

[0026] 007—Left bulkhead

[0027] 008—Middle partition

[0028] 009—Upper cover

[0029] 010—Lower cover

[0030] 012—AC box

[0031] 013—Converter Box

[0032] 014—DC box

[0033] 015—Voltage upper chamber

[0034] 016—Variation chamber

[0035] 017—Flow conversion chamber

[0036] 018—PCS secondary circuit box

[0037] 019—BMS secondary circuit box

[0038] 020—FMS secondary circuit box

[0039] 021—PMS secondary circuit box

[0040] 022—EMS secondary circuit box

[0041] 023—AC / DC working power supply box

[0042] 024—DC / DC working power supply box

[0043] 025—Secondary circuit bus board

[0044] 026—External terminal

[0045] 027—Bus board PCS connector

[0046] 028—Bus board BMS connector

[0047] 029—Bus board FMS connector

[0048] 030—Bus board PMS connector

[0049] 031—Bus board EMS connector

[0050] 034—PCS box terminal

[0051] 035—BMS box terminal

[0052] 036—FMS box terminal

[0053] 037—PMS box terminal

[0054] 038—EMS box terminal

[0055] 039—AC / DC box terminal

[0056] 040—DC / DC box terminal

[0057] 101—Primary AC Circuit

[0058] 102—AC input terminal

[0059] 103—AC circuit breaker

[0060] 104—AC fuse

[0061] 105—AC interface

[0062] 201—Primary Converter Circuit

[0063] 202—Filter reactor assembly

[0064] 203—Energy storage capacitor assembly

[0065] 204—IGBT components

[0066] 205—Converter Interface

[0067] 301—Primary DC Circuit

[0068] 303—DC access terminal

[0069] 304—DC circuit breaker

[0070] 305—DC fuse

[0071] 306—DC relay

[0072] 307—DC interface

[0073] 401—Fire-fighting fluid storage tank

[0074] 402—Spray nozzle

[0075] 403—Spray nozzle

[0076] 404—Liquid storage tank wiring DETAILED DESCRIPTION

[0077] A microgrid battery energy storage device secondary circuit installation and connection structure, including: a steel frame 001, the frame 001 is welded by the front plate 002, the rear panel 003, the right side plate 004, the left side plate 005, the right partition 006, the left partition 007; the right partition 006 and the left partition 007 divide the frame 001 into an AC box 012, a converter box 013, and a DC box 014; the converter box 013 has a middle partition 008, which is shorter and welded to the rear panel 003. Partition 008 divides the converter box 013 into the converter upper chamber 015, the converter lower chamber 016, and the converter front chamber 017; the machine frame 001 has an upper cover 009 and a lower cover 010; according to the primary and secondary devices and circuits in the 5S integrated device and their temperature, electromagnetic compatibility and other characteristics, the device is divided into three boxes and three chambers, making the device structure clear and facilitating assembly, debugging and maintenance. The right partition 006, the left partition 007, and the middle partition 008 are not only used for space division and installation of devices and components, but also have the effects of heat insulation and electromagnetic interference isolation.

[0078] There are metal-made PCS secondary circuit box 018, BMS secondary circuit box 019, FMS secondary circuit box 020, PMS secondary circuit box 021, EMS secondary circuit box 022, AC / DC working power supply box 023, DC / DC working power supply box 024; PMS secondary circuit box 021 is installed on the side of AC box 012 and fixed on the right side plate 004 or right partition 006, EMS secondary circuit box 022 is installed on the side of AC box 012 and fixed on the right partition 006 or right side plate 004, BMS secondary circuit box 019 is installed on the side of DC box 014 and fixed. On the left side panel 005 or the left partition 007, the FMS secondary circuit box 020 is installed on the side of the DC box 014 and fixed on the left side panel 005 or the left partition 007, the PCS secondary circuit box 018 is flatly installed in the front lower part of the front chamber of the converter box 013, the AC / DC working power supply box 023 is installed on the side of the AC box 012 and fixed on the right side panel 004 or the right partition 006, the DC / DC working power supply box 024 is installed on the side of the DC box 014 and fixed on the left side panel 005 or the left partition 007, or is installed in the AC box 012 and fixed on the right side panel 004 or the right partition 006. The PCS, BMS, FMS, PMS, and EMS secondary circuits and AC / DC and DC / DC power supplies are all housed in a metal, flat, modular enclosure (allowing for independent testing, installation, maintenance, and replacement). This improves electromagnetic compatibility and thermal insulation, facilitates side mounting to reduce space, and secures the enclosure to a partition to facilitate heat dissipation. The installation location is close to the primary circuits, shortening connecting wires, improving electromagnetic compatibility, and reducing costs. This modularity facilitates operation, maintenance, assembly, and replacement.

[0079] A secondary circuit bus board 025 is provided, which is located at the front lower part of the front board 002 and spans the AC box 012, the converter box 013 and the DC box 014; at least 15 external connection terminals 026 are provided on the outside of the secondary circuit bus board 025; on the inside of the secondary circuit bus board 025 there are bus board PCS connectors 027, bus board BMS connectors 028, bus board FMS connectors 029, bus board PMS connectors 030 and bus board EMS connectors 031; on the PCS secondary circuit box 018 there is a PCS box connection terminal 034, on the BMS secondary circuit box 019 there is a BMS box connection terminal 035, on the FMS secondary circuit box 020 there is an FMS box connection terminal 036, on the PMS secondary circuit box 021 there is a PMS box connection terminal 037, and on the EMS secondary circuit box 038 there is a PMS box connection terminal 039. There is an EMS box terminal 038 on 22, an AC / DC box terminal 039 on the AC / DC working power supply box 023, and a DC / DC box terminal 040 on the DC / DC working power supply box 024; the PCS box terminal 034, the BMS box terminal 035, the FMS box terminal 036, the PMS box terminal 037, and the EMS box terminal 038 are respectively connected by cables to the bus board PCS connector 027, the bus board BMS connector 028, the bus board FMS connector 029, the bus board PMS connector 030, and the bus board EMS connector 031 on the secondary circuit bus board 025, and the AC / DC box terminal 039 and the DC / DC box terminal 040 are connected to the PMS box terminal 037; the external terminal 026 is connected to the relevant terminals of the external device. The main connections between PCS, BMS, FMS, PMS, and EMS secondary circuit boxes 018, 019, 020, 021, and 022 are information exchange and DC working power sharing. Information adopts bus communication mode, and uses a secondary circuit bus board 025 with a communication bus and a DC working power line and a plug-in connection method, which greatly simplifies the connection lines and facilitates production, assembly, debugging, and replacement. At the same time, the bus method improves electromagnetic compatibility.

[0080] The AC box 012 has a primary AC circuit 101 composed of interconnected AC primary components. The primary AC circuit 101 has AC input terminals 102, AC circuit breaker 103, and AC fuse 104. The PMS box terminal 037 on the PMS secondary circuit box 021 and the AC / DC box terminal 039 on the AC / DC working power supply box 023 have wires or cables connected to the primary AC circuit 101 or to the AC interface 105 on the primary AC circuit 101. The primary AC circuit is connected to the power distribution grid. The PMS secondary circuit The circuit box 021 manages the safe and reliable operation of the power supply by collecting the parameters of the primary AC circuit 101. The AC / DC working power supply box 023 obtains input energy from the primary AC circuit. The converter box 013 has a primary converter circuit 201 composed of a plurality of converter primary components connected to each other. The primary converter circuit 201 has a filter reactor component 202, an energy storage capacitor component 203, and an IGBT component 204. The PCS box terminal 034 on the PCS secondary circuit box 018 has a wire or cable connected to the primary converter circuit 201 or the primary converter circuit 201. The converter interface 205 on the circuit 201 is connected, and the PCS secondary circuit box 018 realizes the conversion of the distribution AC power into DC power that can be stored in the battery and the conversion of the battery DC power into AC power that can be injected into the distribution AC grid by collecting parameters of the primary converter circuit 201 and controlling the operating conditions; the DC box 014 has a primary DC circuit 301 composed of DC primary components connected to each other, and the primary DC circuit 301 has DC access terminals 303, DC circuit breaker 304, DC fuse 305, DC relay 306, and BMS secondary circuit The BMS box terminal 035 on the circuit box 019 and the DC / DC box terminal 040 on the DC / DC working power supply box 024 are connected to the primary DC circuit 301 or the DC interface 307 on the primary DC circuit 301 by wires or cables. The primary DC circuit 301 is connected to the energy storage battery. The BMS secondary circuit box 019 realizes safe and economical operation management of the energy storage battery by collecting parameters of the primary DC circuit 301 and controlling the operating conditions. The DC / DC working power supply box 024 obtains input energy from the primary DC circuit.

[0081] A firefighting fluid tank 401 is housed in DC box 014. A spray connection nozzle 402 is mounted on the upper front portion of the left side panel 005 of DC box 014. A spray nozzle 403 is located at one end of firefighting fluid tank 401, and a tank connection 404 is located at the other end. A liquid conduit connects nozzle 403 to spray connection nozzle 402. Tank connection 404 is connected to FMS box terminal 036. When the FMS secondary circuit box 020 receives firefighting information, it activates tank 401 via FMS box terminal 036 and tank connection 404, spraying firefighting fluid from spray nozzle 403 through spray connection nozzle 402.

Claims

1. A secondary circuit installation and connection structure for a microgrid battery energy storage integrated device, characterized by comprising: A steel machine frame (001), the machine frame (001) is welded together by a front plate (002), a rear panel (003), a right side plate (004), a left side plate (005), a right partition plate (006), and a left partition plate (007); the right partition plate (006) and the left partition plate (007) divide the machine frame (001) longitudinally into an AC box (012), a converter box (013), and a DC box (014); the converter box (013) has a middle partition plate (008), the middle partition plate (008) is shorter and is welded to the rear panel (003), and the middle partition plate (008) divides the converter box (013) into an upper converter chamber (015), a lower converter chamber (016), and a front converter chamber (017); the machine frame (001) has an upper cover plate (009) and a lower cover plate (010); There are PCS secondary circuit box (018), BMS secondary circuit box (019), FMS secondary circuit box (020), PMS secondary circuit box (021), EMS secondary circuit box (022), AC / DC working power supply box (023), DC / DC working power supply box (024); the PMS secondary circuit box (021) is installed on the side of the AC box (012) and fixed on the right side plate (004) or the right partition (006); the EMS secondary circuit box (022) is installed on the side of the AC box (012) and fixed on the right partition (006) or the right side plate (004); the BMS secondary circuit box (019) is installed on the side of the DC box (014) and fixed on the left side plate ( 005) or on the left partition (007), the FMS secondary circuit box (020) is installed on the side of the DC box (014) and fixed on the left side plate (005) or on the left partition (007), the PCS secondary circuit box (018) is installed flat on the front lower part of the front room of the converter box (013), the AC / DC direct current working power supply box (023) is installed on the side of the AC box (012) and fixed on the right side plate (004) or on the right partition (006), the DC / DC direct current working power supply box (024) is installed on the side of the DC box (014) and fixed on the left side plate (005) or on the left partition (007) or installed in the AC box (012) and fixed on the right side plate (004) or on the right partition (006); A fire-fighting liquid storage tank (401) is installed in the DC box (014), and a liquid spray connection nozzle (402) is installed on the front upper portion of the left side plate (005) of the DC box (014). A liquid spray nozzle (403) is provided at one end of the fire-fighting liquid storage tank (401), and a liquid storage tank connection (404) is provided at the other end of the fire-fighting liquid storage tank (401); a liquid guide tube is provided to connect the liquid spray nozzle (403) and the liquid spray connection nozzle (402); and the liquid storage tank connection (404) is connected to the FMS box terminal (036).

2. The secondary circuit installation and connection structure of the microgrid battery energy storage integrated device according to claim 1 is characterized by: A secondary circuit bus board (025) is provided; the secondary circuit bus board (025) is located at the front lower part of the front board (002) and spans the AC box (012), the converter box (013) and the DC box (014); the outer side of the secondary circuit bus board (025) has at least 15 external connection terminals (026); the inner side of the secondary circuit bus board (025) has a bus board PCS connector (027), a bus board BMS connector (028), a bus board FMS connector (029), a bus board PMS connector (010), and a bus board BMS connector (011). Plug-in (030), bus board EMS connector (031); PCS box terminal (034) on PCS secondary circuit box (018), BMS box terminal (035) on BMS secondary circuit box (019), FMS box terminal (036) on FMS secondary circuit box (020), PMS box terminal (037) on PMS secondary circuit box (021), EMS box terminal (038) on EMS secondary circuit box (022), AC / DC working power supply The box (023) has an AC / DC box terminal (039), and the DC / DC working power supply box (024) has a DC / DC box terminal (040); the PCS box terminal (034) has a cable connected to the bus board PCS connector (027) on the secondary circuit bus board (025), the BMS box terminal (035) has a cable connected to the BMS connector (028) on the secondary circuit bus board (025), and the FMS box terminal (036) has a cable connected to the secondary circuit bus board (02 5), the PMS box terminal (037) is connected to the PMS connector (030) on the secondary circuit bus board (025) by a cable, the EMS box terminal (038) is connected to the EMS connector (031) on the secondary circuit bus board (025) by a cable, the AC / DC box terminal (039) and the DC / DC box terminal (040) are connected to the PMS box terminal (037); the external terminal (026) is connected to the relevant terminal of the external device.

3. The secondary circuit installation and connection structure of the microgrid battery energy storage integrated device according to claim 1 is characterized by: The AC box (012) contains a primary AC circuit (101) composed of AC primary components connected to each other. The primary AC circuit (101) contains an AC input terminal (102), an AC circuit breaker (103), and an AC fuse (104). The PMS box terminal (037) on the PMS secondary circuit box (021) and the AC / DC box terminal (039) on the AC / DC working power supply box (023) are connected to the primary AC circuit (101) or to the AC interface (105) on the primary AC circuit (101) by wires or cables. The primary AC circuit is connected to the power distribution grid; The S secondary circuit box (021) performs power supply safety and reliable operation management by collecting parameters of the primary AC circuit (101); the AC / DC working power supply box (023) obtains input energy from the primary AC circuit; the converter box (013) has a primary converter circuit (201) composed of converter primary components connected to each other, the primary converter circuit (201) has a filter reactor component (202), an energy storage capacitor component (203), and an IGBT component (204), and the PCS box terminal (034) on the PCS secondary circuit box (018) has a wire or cable connected to the primary converter circuit (201) or to the primary converter circuit (201). The primary converter circuit (201) is connected to the converter interface (205); the PCS secondary circuit box (018) realizes the conversion of the distribution AC power into DC power that can be stored in the battery and the conversion of the battery DC power into AC power that can be injected into the distribution AC grid by collecting parameters of the primary converter circuit (201) and controlling the operating conditions; the DC box (014) has a primary DC circuit (301) composed of DC components connected to each other, and the primary DC circuit (301) has a DC access terminal (303), a DC circuit breaker (304), a DC fuse (305), a DC relay (306), and the BMS secondary The BMS box terminal (035) on the circuit box (019) and the DC / DC box terminal (040) on the DC / DC working power supply box (024) are connected to the primary DC circuit (301) or the DC interface (307) on the primary DC circuit (301) by wires or cables. The primary DC circuit (301) is connected to the energy storage battery. The BMS secondary circuit box (019) realizes safe and economical operation management of the energy storage battery by collecting parameters of the primary DC circuit (301) and controlling the operating conditions. The DC / DC working power supply box (024) obtains input energy from the primary DC circuit.

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