Energy storage power station monitoring device

Abstract

The utility model discloses an energy storage power station monitoring device which comprises a control module, a DI / DO module, a liquid cooling unit, a fire-fighting device, a converter, a battery cluster management module and a plurality of battery boxes, the control module is connected with the liquid cooling unit through an RS485 interface, the control module is connected with the fire-fighting device through a DI / DO interface, the control module is connected with the battery cluster management module through a CAN bus, and the converter is connected with the battery cluster management module through a CAN bus. The control module is further connected with a converter through a local area network, the battery cluster management module is connected with a battery box management module of a battery box through a CAN bus, and the positive electrode and the negative electrode of a single battery of the battery box are connected with the converter; and the DI / DO module is connected with the liquid cooling unit, the control chip, the fire-fighting device and the battery cluster management module through DI / DO interfaces. And the DI / DO module receives signals from the DO interfaces of the liquid cooling unit, the control module and the fire fighting device and forwards the signals to the battery cluster management module and the DI interface of the converter, so that the reliability is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery energy storage management, and in particular to a monitoring device for energy storage power stations. Background Technology

[0002] With the rapid development of the energy storage market, energy storage power stations are becoming increasingly important as a crucial bridge connecting energy production. In traditional solutions, the main control chip connects to the battery cluster management module via a CAN bus. When a battery pack malfunctions, the main control chip shuts down the battery cluster management module. However, single-wire control lacks reliability, especially when a battery fails, which may cause CAN communication errors, preventing the battery cluster management module from shutting down in time and leading to dangerous situations such as overcharging, over-discharging, and overheating. Summary of the Invention

[0003] This invention primarily addresses the technical problem of insufficient reliability of single-line and single-type communication in existing technologies, and provides a monitoring device for energy storage power stations with backup communication lines and strong anti-interference capabilities.

[0004] This utility model addresses the aforementioned technical problems primarily through the following technical solution: A monitoring device for an energy storage power station includes a control module, a DI / DO module, a liquid-cooled unit, a fire-fighting device, a converter, a battery cluster management module, and several battery boxes. Each battery box includes an interconnected battery box management module and individual batteries. The control module is connected to the liquid-cooled unit via an RS485 interface, the fire-fighting device via a DI / DO interface, and the battery cluster management module via a CAN bus. The control module is also connected to the converter via a local area network. The battery cluster management module is connected to the battery box management module via a CAN bus. The positive and negative terminals of each individual battery are connected to the converter. The DI / DO module is connected to the liquid-cooled unit, the control chip, the fire-fighting device, the battery cluster management module, and the converter via a DI / DO interface.

[0005] Compared to traditional solutions, this solution adds a DI / DO module to receive signals from the DO interfaces of the liquid chiller, control module, and fire suppression system, and forwards them to the DI interfaces of the battery cluster management module and the inverter. When the liquid chiller's sensors detect an anomaly and meet shutdown requirements, or when the control module determines shutdown requirements based on sensor or control signals, or when the fire suppression system is activated, a shutdown signal is sent to the DI / DO module via hardwired communication. The DI / DO module then forwards the shutdown signal to the battery cluster management module and the inverter, controlling them to shut down or disconnect their circuits. Compared to sending control signals only via the CAN bus or LAN, the DI / DO hardwired interface offers lower latency, higher reliability, stronger anti-interference capabilities, greater independence, ease of implementation and maintenance, and provides an additional signal channel, avoiding communication errors caused by interference with CAN communication or the LAN, thus preventing situations where timely shutdown is not possible.

[0006] The control module integrates the energy management system and the battery management system. Based on the battery cluster voltage, current, individual cell voltage, and individual cell temperature information uploaded by the battery cluster management module and the battery box management module, it sets battery cluster protection parameters and sends them to the battery cluster management module to control the switching of the battery cluster and inverter connection circuit. The control module uses the ampere-hour integral method (SOC=1-∫Idt / Q) and the open-circuit voltage method, combined with battery temperature, to calculate the battery cluster SOC. Based on the battery cluster SOC, the energy data W from the meter, and historical data stored in the device, it calculates the battery SOH (SOH=dW / dSOC). The control module generates power control commands based on the received power demand and battery cluster protection parameters and sends them to the inverter for execution. Based on the battery temperature collected by the battery box management module, the control module calculates the battery temperature range and standard deviation and sends control commands to the liquid-cooled unit. When the battery box shows signs of smoke, flames, or other fire hazards, the control module sends activation commands to the fire suppression system to extinguish the fire.

[0007] The battery cluster management module is equipped with a voltage acquisition module and a current acquisition module to collect battery cluster voltage and current information. The device is connected to the control module via a CAN interface to upload information such as battery voltage, temperature and current, and to receive circuit switching control commands from the control chip.

[0008] The battery box management module is equipped with a voltage acquisition module and a temperature detection module. Each battery box management module collects the voltage and temperature information of a single battery cell in the battery box. The battery box management module is connected to the battery cluster management module via a CAN interface to upload the voltage and temperature information of the single battery cells in the battery box. Multiple battery boxes are connected in series to form a battery cluster, which is then connected to the inverter.

[0009] The inverter connects to the control module via a LAN interface to receive power control commands from the control module. The inverter also has a power input interface and a power output interface. The power input interface is connected to the power grid, and the power output interface is connected to the battery cluster to enable charging and discharging operations of the battery cluster according to the energy dispatch commands of the control chip. The inverter is connected to at least one battery cluster.

[0010] The control module connects to the liquid cooling unit via an RS485 interface to control the temperature of the battery clusters. The control module also connects to the emergency stop device or fire suppression system via a DI / DO interface to enable emergency response measures such as disconnecting the battery system or extinguishing fires in emergency situations.

[0011] Preferably, the DI / DO module includes an MCU chip, several output units, several switching units, and several input units. The MCU chip is an MC9S12XET256MAL. Pins 62, 64, 66, 68, 70, 77, 79, and 80 of the MCU chip are each connected to an input unit. Pins 63, 65, 67, 69, 71, and 78 of the MCU chip are each connected to an output unit. Pins 81 and 82 of the MCU chip are each connected to a switching unit. The first input unit... The system includes a resistor R1, an optocoupler O1, a diode D6, and a capacitor C7. The first terminal of the resistor R1 is the input pin of the input unit, and the second terminal of the resistor R1 is connected to the negative input terminal of the optocoupler O1. The positive input terminal of the optocoupler O1 is connected to a 24V power supply through the diode D6. The first output terminal of the optocoupler O1 is connected to the MCU chip, and the second output terminal of the optocoupler O1 is grounded. The capacitor C7 is connected across the two terminals of the output terminal of the optocoupler O1. The structure of the remaining input units is the same as that of the first input unit. The control module, the liquid cooling unit, and the fire-fighting device are each connected to the input pin of one input unit.

[0012] The DI / DO module's input unit receives signals, processes them through the MCU chip, and then forwards and controls them via the output and switching units, achieving independent channel control. Electrical isolation between the input and output is achieved through optocoupler O1 to protect the MCU. Diode D6 prevents circuit damage from incorrect input signal polarity or reverse voltage. The trigger threshold of the input signal can be adjusted using a combination of resistor R1 and diode D6. Capacitor C7 is used to filter out noise in the output signal.

[0013] There can be multiple battery cluster management modules, each connected to at least one battery box. The DI / DO module has multiple output units, allowing for flexible expansion and connection of battery cluster management modules. Similarly, based on multiple input units, the sources of the DI / DO input signals can be added or adjusted as needed.

[0014] Preferably, the first output unit includes an optocoupler O8, resistors R85, R89, and R11, a MOSFET Q13, diodes D18 and D15; the positive input terminal of optocoupler O8 is connected to a +3.3V power supply, the negative input terminal of optocoupler O8 is connected to the first terminal of resistor R85, the second terminal of resistor R85 is the input pin of the output unit, the first output terminal of optocoupler O8 is connected to a +24V power supply, and the second output terminal of optocoupler O8 is connected to the gate of MOSFET Q13 through resistor R89. With the source grounded, the drain of MOSFET Q13 is connected to the +24V power supply via diode D18. The drain of MOSFET Q13 is the output pin of the output unit. Resistor R11 is connected between the gate and source of MOSFET Q13, and diode D15 is connected between the source and drain of MOSFET Q13. Diode D15 is a bidirectional Zener diode. The structure of the remaining output units is the same as the first output unit. The input pin of the output unit is connected to the MCU chip, and each battery cluster management module and inverter is connected to one output pin of the output unit.

[0015] Complete electrical isolation between input and output is achieved via optocoupler O8, improving safety and interference immunity. The input side uses 3.3V logic level control, ensuring strong compatibility. The output side provides 24V, capable of driving high-power loads. Diode D15 provides overvoltage protection to prevent transient voltage damage to the circuit. Diode D18 provides freewheeling protection for inductive loads. Resistor R11 ensures that the gate voltage of the MOSFET is 0V in the off state, preventing false turn-on.

[0016] Preferably, the first switching unit includes a resistor R103, an optocoupler O14, a resistor R112, a transistor Q11, a relay JK1, a resistor R83, and a diode D24. The positive input terminal of the optocoupler O14 is connected to a +3.3V power supply through a resistor R103, and the negative input terminal of the optocoupler O14 serves as the input terminal of the switching unit, connected to the MCU chip. The first output terminal of the optocoupler O14 is connected to the base of the transistor Q11 through a resistor R112, and the second output terminal of the optocoupler O14 is connected to the relay JK1. The second terminal of the control terminal of K1 is connected to the emitter of transistor Q11, which is connected to a 24V power supply. The collector of transistor Q11 is connected to the first terminal of the control terminal of relay JK1. Resistor R83 is connected between the emitter and base of transistor Q11. The anode of diode D24 is connected to the second terminal of the control terminal of relay JK1 and grounded. The cathode of diode D24 is connected to the first terminal of the control terminal of relay JK1. The moving and stationary contacts of relay JK1 are connected to the control circuit of the fire protection device as the control terminals of the switching unit.

[0017] The switching unit employs dual isolation: optocoupler O14 isolates the input control signal from the transistor drive circuit, and the relay isolates the transistor circuit from the load circuit, effectively enhancing anti-interference and reliability. When the input is low, the optocoupler conducts, and the relay engages. Transistor Q11 amplifies the optocoupler's output current, driving the relay coil. Diode D24 provides freewheeling protection for the relay coil. Resistor R83 accelerates the transistor's turn-off, improving the relay's response speed. The relay contacts provide a switching output that can control various types of loads, including fire-fighting equipment, thus providing a backup signal channel for fire-fighting equipment, ensuring timely activation for cooling and fire suppression when needed. The other switching unit has the same structure as the first, serving as a backup for connecting other necessary devices, improving the device's expandability.

[0018] Preferably, the energy storage power station monitoring device also includes a display module and a power meter. The control module connects to the display module and the power meter via an RS485 interface. The power meter can statistically analyze the input and output energy of the battery cluster. The display module includes an LED display and a configurable display module, enabling the configuration of parameters for devices such as the battery cluster and converter. The LED display shows the aforementioned data, allowing staff to intuitively assess the operating status of connected devices and the battery cluster. The configurable data module facilitates maintenance and operation.

[0019] As a preferred option, the energy storage power station monitoring device also includes a camera, and the control module connects to the camera via a local area network to achieve video monitoring of the energy storage system.

[0020] The beneficial effects of this invention are that the two independent control signal channels effectively improve the reliability of the system, the DI / DO hardwire has extremely high anti-interference capability, is not affected by battery abnormalities, has a fast response speed, and is low in cost. Attached Figure Description

[0021] Figure 1 This is a circuit block diagram of this utility model;

[0022] Figure 2 This is a circuit diagram of an MCU chip for a DI / DO module according to this utility model;

[0023] Figure 3 This is a circuit diagram of eight input units of a DI / DO module according to this utility model;

[0024] Figure 4 This is a circuit diagram of the six output units of a DI / DO module according to this utility model;

[0025] Figure 5 This utility model relates to two switching unit circuits of a DI / DO module;

[0026] In the diagram: 1. Control module; 2. DI / DO module; 3. Liquid chiller; 4. Fire suppression system; 5. Converter; 6. Battery cluster management module; 7. Battery box management module; 8. Individual battery; 9. Electricity meter; 10. Display module; 11. Camera. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0028] Example: A monitoring device for an energy storage power station according to this example, such as Figure 1 As shown, the system includes a control module 1, a DI / DO module 2, a liquid chiller unit 3, a fire-fighting device 4, a converter 5, a battery cluster management module 6, several battery boxes, a meter 9, a display module 10, and a camera 11. Each battery box includes an interconnected battery box management module 7 and individual batteries 8. The control module is connected to the liquid chiller unit via an RS485 interface, the fire-fighting device via a DI / DO interface, and the battery cluster management module via a CAN bus. The control module is also connected to the converter via a local area network. The battery cluster management module is connected to the battery box management module via a CAN bus. The positive and negative terminals of each individual battery are connected to the converter. The DI / DO module is connected to the liquid chiller unit, control chip, fire-fighting device, and battery cluster management module via a DI / DO interface.

[0029] Compared to traditional solutions, this solution adds a DI / DO module to receive signals from the DO interfaces of the liquid chiller, control module, and fire suppression system, and forwards them to the DI interfaces of the battery cluster management module and the inverter. When the liquid chiller's sensors detect an anomaly and meet shutdown requirements, or when the control module determines shutdown requirements based on sensor or control signals, or when the fire suppression system is activated, a shutdown signal is sent to the DI / DO module via hardwired communication. The DI / DO module then forwards the shutdown signal to the battery cluster management module and the inverter, controlling them to shut down or disconnect their circuits. Compared to sending control signals only via the CAN bus or LAN, the DI / DO hardwired interface offers lower latency, higher reliability, stronger anti-interference capabilities, greater independence, ease of implementation and maintenance, and provides an additional signal channel, avoiding communication errors caused by interference with CAN communication or the LAN, thus preventing situations where timely shutdown is not possible.

[0030] The control module integrates the energy management system and the battery management system. Based on the battery cluster voltage, current, individual cell voltage, and individual cell temperature information uploaded by the battery cluster management module and the battery box management module, it sets battery cluster protection parameters and sends them to the battery cluster management module to control the switching of the battery cluster and inverter connection circuit. The control module uses the ampere-hour integral method (SOC=1-∫Idt / Q) and the open-circuit voltage method, combined with battery temperature, to calculate the battery cluster SOC. Based on the battery cluster SOC, the energy data W from the meter, and historical data stored in the device, it calculates the battery SOH (SOH=dW / dSOC). The control module generates power control commands based on the received power demand and battery cluster protection parameters and sends them to the inverter for execution. Based on the battery temperature collected by the battery box management module, the control module calculates the battery temperature range and standard deviation and sends control commands to the liquid-cooled unit. When the battery box shows signs of smoke, flames, or other fire hazards, the control module sends activation commands to the fire suppression system to extinguish the fire.

[0031] The battery cluster management module is equipped with a voltage acquisition module and a current acquisition module to collect battery cluster voltage and current information. The device is connected to the control module via a CAN interface to upload information such as battery voltage, temperature and current, and to receive circuit switching control commands from the control chip.

[0032] The battery box management module is equipped with a voltage acquisition module and a temperature detection module. Each battery box management module collects the voltage and temperature information of a single battery cell in the battery box. The battery box management module is connected to the battery cluster management module via a CAN interface to upload the voltage and temperature information of the single battery cells in the battery box. Multiple battery boxes are connected in series to form a battery cluster, which is then connected to the inverter.

[0033] The inverter connects to the control module via a LAN interface to receive power control commands from the control module. The inverter also has a power input interface and a power output interface. The power input interface is connected to the power grid, and the power output interface is connected to the battery cluster to enable charging and discharging operations of the battery cluster according to the energy dispatch commands of the control chip. The inverter is connected to at least one battery cluster.

[0034] The control module connects to the liquid cooling unit via an RS485 interface to control the temperature of the battery clusters. The control module also connects to the emergency stop device or fire suppression system via a DI / DO interface to enable emergency response measures such as disconnecting the battery system or extinguishing fires in emergency situations.

[0035] The DI / DO module includes an MCU chip, several output units, several switching units, and several input units. The MCU chip is an MC9S12XET256MAL. Figure 2As shown, pins 62, 64, 66, 68, 70, 77, 79, and 80 of the MCU chip are each connected to an input unit; pins 63, 65, 67, 69, 71, and 78 of the MCU chip are each connected to an output unit; and pins 81 and 82 of the MCU chip are each connected to a switching unit. Figure 3 As shown, the first input unit includes a resistor R1, an optocoupler O1, a diode D6, and a capacitor C7. The first end of the resistor R1 is the input pin of the input unit, and the second end of the resistor R1 is connected to the negative input terminal of the optocoupler O1. The positive input terminal of the optocoupler O1 is connected to the 24V power supply through the diode D6. The first output terminal of the optocoupler O1 is connected to the MCU chip, and the second output terminal of the optocoupler O1 is grounded. The capacitor C7 is connected across the two terminals of the output terminal of the optocoupler O1. The structure of the remaining input units is the same as that of the first input unit. The control module, the liquid cooling unit, and the fire-fighting device are each connected to the input pin of one input unit.

[0036] The DI / DO module's input unit receives signals, processes them through the MCU chip, and then forwards and controls them via the output and switching units, achieving independent channel control. Electrical isolation between the input and output is achieved through optocoupler O1 to protect the MCU. Diode D6 prevents circuit damage from incorrect input signal polarity or reverse voltage. The trigger threshold of the input signal can be adjusted using a combination of resistor R1 and diode D6. Capacitor C7 is used to filter out noise in the output signal.

[0037] There can be multiple battery cluster management modules, each connected to at least one battery box. The DI / DO module has multiple output units, allowing for flexible expansion and connection of battery cluster management modules. Similarly, based on multiple input units, the sources of the DI / DO input signals can be added or adjusted as needed.

[0038] like Figure 4As shown, the first output unit includes optocoupler O8, resistors R85, R89, and R11, MOSFET Q13, diode D18, and diode D15. The positive input terminal of optocoupler O8 is connected to a +3.3V power supply, and the negative input terminal of optocoupler O8 is connected to the first terminal of resistor R85. The second terminal of resistor R85 is the input pin of the output unit. The first output terminal of optocoupler O8 is connected to a +24V power supply, and the second output terminal of optocoupler O8 is connected to the gate of MOSFET Q13 through resistor R89. The source of MOSFET Q13... With the gate grounded, the drain of MOSFET Q13 is connected to the +24V power supply via diode D18. The drain of MOSFET Q13 is the output pin of the output unit. Resistor R11 is connected between the gate and source of MOSFET Q13, and diode D15 is connected between the source and drain of MOSFET Q13. Diode D15 is a bidirectional Zener diode. The structure of the remaining output units is the same as the first output unit. The input pin of the output unit is connected to the MCU chip, and each battery cluster management module and inverter is connected to one output pin of the output unit.

[0039] Complete electrical isolation between input and output is achieved via optocoupler O8, improving safety and interference immunity. The input side uses 3.3V logic level control, ensuring strong compatibility. The output side provides 24V, capable of driving high-power loads. Diode D15 provides overvoltage protection to prevent transient voltage damage to the circuit. Diode D18 provides freewheeling protection for inductive loads. Resistor R11 ensures that the gate voltage of the MOSFET is 0V in the off state, preventing false turn-on.

[0040] like Figure 5 As shown, the first switching unit includes resistor R103, optocoupler O14, resistor R112, transistor Q11, relay JK1, resistor R83, and diode D24. The positive input terminal of optocoupler O14 is connected to the +3.3V power supply through resistor R103, and the negative input terminal of optocoupler O14 serves as the input terminal of the switching unit, connected to pin 81 of the MCU chip. The first output terminal of optocoupler O14 is connected to the base of transistor Q11 through resistor R112, and the second output terminal of optocoupler O14 is connected to the relay. The second terminal of the control terminal of JK1 is connected to the emitter of transistor Q11, which is connected to a 24V power supply. The collector of transistor Q11 is connected to the first terminal of the control terminal of relay JK1. Resistor R83 is connected between the emitter and base of transistor Q11. The anode of diode D24 is connected to the second terminal of the control terminal of relay JK1 and grounded. The cathode of diode D24 is connected to the first terminal of the control terminal of relay JK1. The moving and stationary contacts of relay JK1 are connected to the control circuit of the fire protection device as the control terminals of the switching unit.

[0041] The switching unit employs dual isolation: optocoupler O14 isolates the input control signal from the transistor drive circuit, and the relay isolates the transistor circuit from the load circuit, effectively enhancing anti-interference and reliability. When the input is low, the optocoupler conducts, and the relay engages. Transistor Q11 amplifies the optocoupler's output current, driving the relay coil. Diode D24 provides freewheeling protection for the relay coil. Resistor R83 accelerates the transistor's turn-off, improving the relay's response speed. The relay contacts provide a switching output that can control various types of loads, including fire-fighting equipment, thus providing a backup signal channel for fire-fighting equipment, ensuring timely activation for cooling and fire suppression when needed. The other switching unit has the same structure as the first, serving as a backup for connecting other necessary devices, improving the device's expandability.

[0042] The control module connects to the display module and the electricity meter via an RS485 interface. The electricity meter can statistically analyze the input and output energy of the battery cluster. The display module includes an LED display and a configurable display module, allowing for parameter configuration of the battery cluster, inverter, and other equipment. The LED display shows the aforementioned data, enabling staff to intuitively assess the operating status of connected equipment and the battery cluster. The configurable data module facilitates maintenance. The control module connects to a camera via a local area network for video monitoring of the energy storage system.

[0043] This device supports communication access and protocols (RS485 / CAN / LAN) for various devices, has rich hardware interfaces, and can be compatible with multiple devices accessing simultaneously. It can simultaneously reduce the interaction information between EMS and BMS, electricity meters, and liquid cooling systems, and the system has stronger timeliness and stability. In terms of equipment cost, it effectively saves system hardware costs.

[0044] This solution integrates EMS and BMS technologies, is compatible with various external energy storage devices, and solves communication and synchronization delay issues to ensure the effectiveness of overall system operation and control.

[0045] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the principles of this invention or exceeding the scope defined by the appended claims.

[0046] Although this document uses terms such as control module, DI / DO module, and battery cluster management module frequently, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. An energy storage plant monitoring device, characterized by, The battery management system comprises a control module, a DI / DO module, a liquid cooling unit, a fire extinguishing device, a converter, a battery cluster management module and a plurality of battery boxes, the battery box comprises a battery box management module and a single battery which are connected to each other, the control module is connected to the liquid cooling unit through an RS485 interface, the control module is connected to the fire extinguishing device through a DI / DO interface, the control module is connected to the battery cluster management module through a CAN bus, the control module is further connected to the converter through a local area network, the battery cluster management module is connected to the battery box management module through the CAN bus, and the positive and negative poles of the single battery are connected to the converter; the DI / DO module is connected to the liquid cooling unit, a control chip, the fire extinguishing device, the battery cluster management module and the converter through the DI / DO interface.

2. The energy storage plant monitoring device of claim 1, wherein, The DI / DO module comprises an MCU chip, a plurality of output units, a plurality of switch units and a plurality of input units, the MCU chip is an MC9S12XET256MAL, the 62th pin, the 64th pin, the 66th pin, the 68th pin, the 70th pin, the 77th pin, the 79th pin and the 80th pin of the MCU chip are respectively connected to an input unit, the 63th pin, the 65th pin, the 67th pin, the 69th pin, the 71th pin and the 78th pin of the MCU chip are respectively connected to an output unit, and the 81th pin and the 82th pin of the MCU chip are respectively connected to a switch unit; the first input unit comprises a resistor R1, a photoelectric coupler O1, a diode D6 and a capacitor C7, the first end of the resistor R1 is an input pin of the input unit, the second end of the resistor R1 is connected to the negative electrode of the input end of the photoelectric coupler O1, the positive electrode of the input end of the photoelectric coupler O1 is connected to a power supply 24V through the diode D6, the first pole of the output end of the photoelectric coupler O1 is connected to the MCU chip, the second pole of the output end of the photoelectric coupler O1 is grounded, and the capacitor C7 is connected across the two poles of the output end of the photoelectric coupler O1, and the structures of the remaining input units are the same as those of the first input unit; the control module, the liquid cooling unit and the fire extinguishing device are respectively connected to the input pin of an input unit.

3. The energy storage plant monitoring device of claim 2, wherein, The first output unit comprises a photoelectric coupler O8, a resistor R85, a resistor R89, a resistor R11, a MOS tube Q13, a diode D18 and a diode D15; the positive electrode of the input end of the photoelectric coupler O8 is connected to a power supply +3.3V, the negative electrode of the input end of the photoelectric coupler O8 is connected to the first end of the resistor R85, the second end of the resistor R85 is an input pin of the output unit, the first pole of the output end of the photoelectric coupler O8 is connected to a power supply +24V, the second pole of the output end of the photoelectric coupler O8 is connected to the gate of the MOS tube Q13 through the resistor R89, the source of the MOS tube Q13 is grounded, the drain of the MOS tube Q13 is connected to a power supply +24V through the diode D18, the drain of the MOS tube Q13 is an output pin of the output unit, the resistor R11 is connected across the gate and the source of the MOS tube Q13, the diode D15 is connected across the source and the drain of the MOS tube Q13, and the diode D15 is a bidirectional voltage stabilizing diode; the structures of the remaining output units are the same as those of the first output unit; the input pin of the output unit is connected to the MCU chip, and each battery cluster management module and the converter are respectively connected to the output pin of an output unit.

4. The energy storage plant monitoring device according to claim 2 or 3, characterized in that The first switch unit comprises a resistor R103, a photocoupler O14, a resistor R112, a triode Q11, a relay JK1, a resistor R83 and a diode D24; a positive electrode of an input end of the photocoupler O14 is connected to a power supply +3.3V through the resistor R103, a negative electrode of the input end of the photocoupler O14 is connected to an MCU chip as an input end of the switch unit, a first pole of an output end of the photocoupler O14 is connected to a base of the triode Q11 through the resistor R112, a second pole of the output end of the photocoupler O14 is connected to a control end second pole of the relay JK1, an emitter of the triode Q11 is connected to a power supply 24V, a collector of the triode Q11 is connected to a control end first pole of the relay JK1, the resistor R83 is connected between the emitter and the base of the triode Q11, a positive electrode of the diode D24 is connected to the control end second pole of the relay JK1 and grounded, a negative electrode of the diode D24 is connected to the control end first pole of the relay JK1, and a moving contact and a stationary contact of the relay JK1 are connected to a control circuit of the fire-fighting device as a control end of the switch unit.

5. The energy storage plant monitoring device of claim 1, wherein, The display module and the electric meter are further connected to the control module through an RS485 interface.

6. The energy storage plant monitoring device of claim 1, wherein, The camera is further connected to the control module through a local area network.

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