A 125kW energy storage device based on IGBT tubes

Abstract

This utility model relates to the field of energy storage technology and discloses an energy storage device based on IGBT tubes with a power output of 125KW. The device includes a housing and several IGBT tubes, a drive control module, a heat sink, several temperature sensors, several small fans, a battery pack, system circuitry, and a voltage access module disposed within the housing. The IGBT tubes are evenly arranged within the housing using a parallel current-sharing design, and each IGBT tube is electrically connected to the drive control module. The drive control module is electrically connected to both the battery pack and the system circuitry. The heat sink is a small T-shaped heat sink with IGBT tubes arranged at equal intervals on both sides. The small fans are evenly arranged on one side of the housing, and each small fan is electrically connected to the system circuitry. Ventilation openings are provided on the other side of the housing opposite the small fans. The temperature sensors are evenly arranged on the heat sink, and each temperature sensor is electrically connected to the system circuitry. This device achieves a 125KW output and is low-cost, highly efficient, reliable, and easy to maintain.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, specifically to an energy storage device based on an IGBT tube with a power of 125KW. Background Technology

[0002] With the rapid development of power electronics technology, power electronic equipment is becoming increasingly closely related to people's work and life. Large electronic equipment cannot function without reliable energy storage devices. In the field of electrical equipment, energy storage devices have been widely used in power supplies for program-controlled exchanges, communications, electronic testing equipment, and control equipment, which has further promoted the rapid development of energy storage devices.

[0003] Energy storage devices utilize modern power electronics technology to control the on and off time ratio of switching transistors, enabling the internal conversion between AC and DC and the output to be stored. Utility Model Content

[0004] To address existing problems, this invention provides an energy storage device based on IGBTs with a power output of 125kW. By using parallel IGBTs for current sharing, the current burden on a batch of IGBTs is reduced, achieving efficient charging and discharging. A zoned heat dissipation system is employed, allowing for targeted optimization of the heat dissipation path based on the internal layout to achieve gradient heat dissipation. Modular circuitry supports parallel capacity expansion and functional extension. This invention can achieve 125kW power output at low cost while meeting requirements for high reliability, high efficiency, and ease of maintenance (modular design), making it suitable for industrial and commercial energy storage, integrated solar-wind energy storage and charging applications, and other scenarios.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] An energy storage device based on IGBTs with a power of 125kW includes a housing and several IGBTs, a drive control module, a heat sink, several temperature sensors, several small fans, a battery pack, system circuitry, and a voltage access module disposed within the housing. The IGBTs are evenly distributed within the housing, employing a parallel current-sharing design, and each IGBT is electrically connected to the drive control module. The drive control module is electrically connected to both the battery pack and the system circuitry. The heat sink is a small T-shaped heat sink with IGBTs arranged at equal intervals on both sides. The small fans are evenly distributed on one side of the housing, and each small fan is electrically connected to the system circuitry. Ventilation openings are provided on the opposite side of the housing, opposite the small fans. The temperature sensors are evenly distributed on the heat sink, and each temperature sensor is electrically connected to the system circuitry, used for zoned feedback control of fan cooling. The voltage access module is electrically connected to the drive control module and can be switched on / off with an external power grid.

[0007] As a further improvement of this utility model, the number of IGBT tubes is at least 48, and the IGBT tubes are connected in parallel.

[0008] As a further improvement of this utility model, the number of heat sinks is at least 6.

[0009] As a further improvement of this utility model, the number of small fans is at least 4, and the specifications of the small fans are 9238.

[0010] As a further improvement of this utility model, the system circuit includes an interface board, an adapter board, a computing board, and a power supply board; the drive control module is electrically connected to the adapter board through the power supply board; the adapter board is electrically connected to the computing board, the interface board, and the small fan respectively; the adapter board is also electrically connected to the drive control module in a PWM manner.

[0011] As a further improvement of this utility model, the adapter board and the interface board are connected by a current sampling circuit, a 485 circuit, a reserved voltage sampling circuit, an ADDR circuit, a BOOT circuit, and a reserved dry contact circuit.

[0012] As a further improvement of this utility model, the adapter board and the computing board are connected via a 96-channel ohm plug.

[0013] As a further improvement of this utility model, the adapter board and the voltage access module are electrically connected through a relay control circuit and a voltage sampling circuit.

[0014] As a further improvement of this utility model, it also includes a large screen. The interface board is electrically connected to the large screen via a 485 circuit, and the 485 chip is an NSi83085 model. The interface board is also electrically connected to the CT sampling equipment to collect current signals.

[0015] As a further improvement of this utility model, the power board includes a transformer for converting the voltage of the drive control module into a stable voltage and current required by the adapter board.

[0016] This utility model has the following beneficial effects:

[0017] This device uses parallel IGBTs. Compared to common IGBT modules, although it requires external circuitry for protection and drive, it can achieve a higher switching frequency and more sensitive response. Furthermore, relying on the equipped drive control module and heat sink, it can achieve high-power output and efficient charging and discharging. Temperature sensors and small fans provide dynamic heat dissipation support and a reasonable airflow design for the distributed IGBTs. The system circuitry and voltage access module realize the internal control and functionality of the energy storage device. Through three core technologies—parallel IGBT current sharing, zoned heat dissipation, and modular circuitry—this device achieves 125kW power output at low cost while meeting requirements for high reliability, high efficiency, and ease of maintenance. It is suitable for industrial and commercial energy storage, integrated solar-wind-storage-charging scenarios, and more.

[0018] Optionally, by connecting 48 IGBTs in parallel, the conduction loss is reduced by shunting each tube, avoiding single tube overload and achieving a high power output of 125KW; the system can still operate at a reduced rating when a single tube fails, such as when 47 tubes are connected in parallel, the power drops to about 122KW, improving reliability; industrial-grade IGBT tubes are used to replace expensive IGBT modules, and the cost per tube is reduced by bulk purchasing.

[0019] Preferably, the T-shaped radiator increases the heat dissipation area, and four 9238 fans provide the required total air volume to control the IGBT junction temperature at a safe operating level; six temperature sensors monitor the radiator temperature in zones, and the drive control module uses PWM speed-regulating fans to achieve zoned cooling and reduce energy consumption; the rated speed and noise level of the small fans are controllable, making them suitable for scenarios involving human living environments and energy storage; and the use of aluminum extruded T-shaped radiators to replace the water cooling system significantly reduces the overall heat dissipation cost.

[0020] Preferably, the small fans are forced to cool, and their speed is dynamically adjusted according to temperature sensor data to improve the efficiency of heat dissipation, ventilation or airflow circulation; multiple small fans are beneficial for air duct design, and basic operation can be guaranteed even if a single fan fails.

[0021] Preferably, the modular design of the system circuit can not only meet the high-capacity and high-power energy storage requirements of the energy storage device, but also support the module access function through scalable modules and interfaces; the interface board can expand communication (485 / CAN) and CT sampling functions; the adapter board can realize signal conversion (Euro plug / relay); the computing board executes control algorithms; the power board provides isolation and conversion power, reducing the risk of fault propagation; the modular design supports single board replacement (such as upgrading the computing power of the computing board without modifying the interface board), shortening the research and development cycle.

[0022] Preferably, the 485 circuit is used for communication and can realize functional expansion; the current sampling circuit, combined with the CT sampling equipment, reduces the SOC estimation error; the ADDR circuit realizes the board address encoding, the BOOT circuit supports remote firmware upgrades, and the reserved dry contact circuit is used for fire linkage; the drive control module achieves millisecond-level power regulation through the PWM speed-regulating fan to meet the frequency regulation requirements of the power grid.

[0023] Optionally, the 96-channel Euro plug interface can be used to connect external BMS, fire protection modules, etc., to achieve low-cost "platform-based" expansion.

[0024] Optionally, the relay control circuit can control the access voltage and switching to protect the charging line and equipment; the voltage sampling circuit can monitor the grid voltage / frequency in real time and collect the three-phase industrial grid access strength to guide the relay control circuit.

[0025] Optionally, the 485 circuit chip (NSi83085 chip) is compatible with Modbus-RTU / CANopen and can be adapted to different brands of EMS systems; the interface board is also connected to the CT acquisition circuit, which can perform signal isolation and modulation, facilitate the optimization of sampling accuracy and efficiency, and also help with fault monitoring and maintenance.

[0026] Optionally, the transformer can achieve single-ended forward rectification output to meet the power supply requirements of low-voltage circuits such as the operation board and interface board; it can also integrate expansion function lines to achieve low-frequency filtering, high-frequency decoupling and common-mode interference suppression. Attached Figure Description

[0027] The accompanying drawings described herein are for illustrative purposes only and do not limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings:

[0028] Figure 1 This is an outline drawing of an energy storage device based on an IGBT tube with a power of 125KW, as described in this embodiment.

[0029] Figure 2 This is a schematic diagram of the internal structure of an energy storage device based on an IGBT tube with a power of 125KW in this embodiment;

[0030] Figure 3 This is a schematic diagram of a heat sink for an energy storage device based on an IGBT tube with a power of 125KW in this embodiment.

[0031] Figure 4 This is a schematic diagram of the internal circuit of an energy storage device based on an IGBT tube with a power of 125KW in this embodiment;

[0032] Figure 5 This is a low-voltage conversion circuit diagram of an energy storage device based on an IGBT tube with a power of 125KW, as described in this embodiment.

[0033] The components include: 1. Housing; 2. Heat sink; 3. Small fan; 4. Inverter inductor; 5. Grid-side inductor; 6. IGBT transistor. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this utility model.

[0035] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] Example 1

[0038] A 125kW energy storage device based on IGBT tubes includes a housing 1, such as... Figure 1 As shown, the system includes several IGBT tubes 6, a drive control module, a heat sink 2, several temperature sensors, several small fans 3, a battery pack, a system circuit, a voltage access module, and a large screen, all housed within the casing 1.

[0039] The IGBT transistors 6 are evenly arranged within the housing 1, employing a parallel current-sharing design. Each IGBT transistor 6 is electrically connected to the drive control module. The number of IGBT transistors 6 is at least 48, and they are connected in parallel. By connecting 48 IGBTs in parallel, current sharing is achieved through single-transistor current shunting, reducing conduction losses (based on P=I).2 (Based on the heating principle), this design avoids single-tube overload and achieves a high power output of 125KW. Even with a single tube failure, the system can still operate at a derating rate (e.g., power drops to approximately 122KW when 47 tubes are connected in parallel), improving reliability. Industrial-grade IGBTs replace expensive IGBT modules, and bulk purchasing reduces the cost per tube. Compared to commonly used IGBT module designs, the parallel design of multiple IGBT tubes allows for stable functionality through external circuitry, and its stability and reliability have been verified in numerous experiments.

[0040] The drive control module is electrically connected to the battery pack and the system circuit respectively. The drive control module is used to drive and control the opening, closing and conduction direction of the 48 IGBT transistors 6 respectively.

[0041] like Figure 2 As shown, the small fans 3 are evenly arranged on one side inside the outer casing 1, and each small fan 3 is electrically connected to the system circuit. The number of small fans 3 is at least 4, and the specification of the small fans 3 is 9238.

[0042] The heat sink 2 is a small T-shaped heat sink, with IGBT transistors 6 arranged at equal intervals on both sides. The number of heat sinks 2 is at least six to avoid the problem of uneven heat dissipation caused by excessively large heat sinks 2. Figure 3 As shown, each heatsink 2 is equipped with 8 independent IGBT tubes 6. Compared with the large heatsink at the bottom, this embodiment uses multiple single-layer T-shaped heatsinks 2, and multiple small fans 3 for distributed heat dissipation. Through software control, the air inside the entire casing forms a circulation and is then discharged through the air outlet. This not only solves the heat dissipation problem, but also reduces the overall height of the casing to half that of traditional PCS models, effectively reducing costs.

[0043] There are six temperature sensors, each mounted on one of the six heat sinks 2. Each temperature sensor is electrically connected to the system circuit for zoned feedback control of the fan cooling system, which reduces costs, saves space, makes the casing smaller, and improves the accuracy of temperature acquisition. The T-shaped heat sink increases the heat dissipation area, and the four 9238 fans provide the required total airflow to keep the IGBT junction temperature at a safe operating level. The six temperature sensors monitor the temperature of the heat sinks 2 in zones, driving the control module to achieve zoned cooling and reduce energy consumption through PWM speed-regulating fans. The small fan 3 has controllable rated speed and noise level, making it suitable for scenarios involving residential environments and energy storage. The use of aluminum extruded T-shaped heat sinks instead of a water-cooling system significantly reduces the overall heat dissipation cost.

[0044] like Figure 4As shown, the voltage input module is electrically connected to the drive control module and can be switched on and off to the external power grid. The voltage input module also includes an inverter, inductors and filter capacitors, relays, Hall current sensors, LCL filters, and an N-phase balanced bridge. The voltage input module has leads from the copper busbars of phases A, B, C, N, P+, and G- connected to the PCB board, and after being divided by a 3M resistor, it is connected to the DSP. The DSP calculates the current DC and AC voltage based on the voltage division ratio. The DSP also outputs a high-precision duty cycle signal via internal PWM to control the on / off timing of the DC-DC converter. The DSP uses a domestically produced chip; the DC-DC converter uses the domestically produced JW5117C chip to replace the TI LM22679 and LM2596S chips, significantly reducing costs while ensuring power supply stability. The energy storage device in this embodiment operates on the principle of receiving three-phase voltage from the power grid. After passing through a fuse, it is connected to the grid-side inductor 5 and a filter capacitor. Following a relay and a Hall current sensor, it is then connected to the inverter inductor 4, which is part of the LCL filter circuit. The voltage is then converted to DC by an IGBT switch and stored in the energy storage device for later use. Conversely, when the stored electricity is needed, the DC released from the energy storage device is converted to AC square wave by the IGBT circuit, and then filtered by the LCL to convert it back to the required AC. By setting the power, it can be converted to 220V mains power and 380V industrial power respectively. An N-phase balancing bridge circuit is added to this circuit to balance the neutral voltage.

[0045] like Figure 4 As shown, the system circuit includes an interface board, an adapter board, a computing board, and a power supply board; the drive control module is electrically connected to the adapter board through the power supply board; the adapter board is electrically connected to the computing board, the interface board, and the small fan 3 respectively; the adapter board is also electrically connected to the drive control module in PWM mode.

[0046] The adapter board and interface board are connected via a current sampling circuit, a 485 circuit, a reserved voltage sampling circuit, an ADDR circuit, a BOOT circuit, and a reserved dry contact circuit. The current sampling circuit detects the load current using a current transformer (CT) and a Hall sensor, used for power calculation, overcurrent protection, and harmonic analysis. The reserved voltage sampling circuit achieves isolated sampling using a voltage transformer (PT), suitable for high-voltage grids (e.g., 480V AC), while simultaneously sampling the low-voltage side using voltage divider resistors and an isolation operational amplifier. The ADDR circuit is primarily used for device addressing and communication control, commonly found in multi-node systems for precise data exchange and resource allocation, and can be used with a CAN circuit for priority determination. The BOOT circuit guides the system circuit into a specified operating mode based on preset conditions upon power-on / reset. The reserved dry contact circuit provides passive relay contact outputs for status indication or external device control (e.g., fan start / stop).

[0047] The adapter board and the computing board are connected via a 96-channel ohm plug.

[0048] The adapter board and the voltage access module are electrically connected through a relay control circuit and a voltage sampling circuit.

[0049] The interface board is electrically connected to the large screen via a 485 circuit, using an NSi83085 485 chip. The interface board is also electrically connected to the CT sampling equipment to collect current signals. The 485 chip is packaged in an SOP16 package, isolated at both ends. One end connects to the TX, RX, and DIR signals, powered by 3.3V, while the other end uses a 5V isolation voltage, outputting 485A and 485B signals to an external port. This embodiment may also include a CAN circuit, with the 485 circuit and CAN circuit being matched and connected. The CAN circuit uses the TD501DCAN chip, a modular chip with isolated ends. One end connects to the TX and RX signals of the CAN signal, while the other end outputs CANH and CANL. The entire module uses a 5V voltage power supply.

[0050] This embodiment also adds a leakage current monitoring circuit, which can be set in the drive control module, system circuit or voltage access module. The initial ABCN is sent out through a leakage current Hall effect sensor SFG-P-PF. After the current passes through this device, the device will output a signal. This signal is processed and enters the sampling interface of the DSP to feed back to the system whether leakage current is generated when the device is running and the magnitude of the leakage current.

[0051] The power board includes a transformer to convert the voltage of the drive control module into the stable voltage and current required by the adapter board. Pin 1 of the transformer is connected to the positive DC input P+, then pin 2 is connected to the drain of the positive high-voltage MOSFET and a freewheeling diode, and a resistor and capacitor are connected to form an RC snubber circuit. Similarly, pin 3 is connected to the midpoint N of the DC input, then pin 4 is connected to the drain of the negative high-voltage MOSFET and a freewheeling diode D4, and a resistor and capacitor are connected to form an RC snubber circuit. Pin 5 of the transformer is connected to the power supply of the switching power supply through a resistor, a fast recovery diode, and an inductor. A filter capacitor is then connected in parallel between the power supply and reference ground N for power filtering. Input filtering is achieved by adding a capacitor between the power supply and reference ground N. A Zener diode clamps the power supply voltage here to 18V to prevent overvoltage and damage to the power supply. Pins 7 and 8 of the transformer's secondary side are directly connected to GND, pins 9 and 10 are connected to a rectifier diode and an RC snubber circuit composed of a resistor and capacitor, and then connected to the output voltage VCC_24V.

[0052] This embodiment also includes a bus capacitor discharge and insulation resistance detection circuit. The bus capacitor discharge circuit works by controlling a normally closed relay to close after the equipment stops operating. Once closed, the relay dissipates excess power through a resistor connecting P+ and G-, achieving the final discharge.

[0053] Compared to the traditional PCS, this embodiment adds leakage current detection function, bus capacitor discharge function, N-phase neutral point balancing function, STS online function (back-to-back connected IGBT tubes 6 to achieve fast switching between grid and off-grid), and adds one 485 and CAN channel.

[0054] This embodiment also adds a low-voltage power conversion circuit. The low-voltage system needs to use +15V, -15V, +5V, and +3.3V. These voltages are obtained from the previously converted +24V. The JW5117C chip is used to convert +24V to +15V and +5V, convert +24V to +5V, and convert +5V to +3.3V. Figure 5 This is a low-voltage conversion circuit diagram of an energy storage device based on an IGBT tube with a power of 125KW in this embodiment. After the 24V power input, it passes through the filter capacitor to pin 2 of JW5117C and then outputs a +15V voltage from pin 8. Pin 3 is called the enable pin of the chip, which pulls up a 5V power supply to control the chip enable. Pin 5 is used as a voltage adjustment pin, and the 15V output voltage is calculated by adjusting R4 and R7.

[0055] Example 2

[0056] The difference between this embodiment and Embodiment 1 is that:

[0057] 1) This embodiment also adds a power indicator circuit and a power safety circuit.

[0058] 2) The power supply input and interface circuit of this embodiment includes a 20P horn socket, a 3P DC input socket, positive and negative DC input fuses, and positive and negative absorption capacitors.

[0059] The power indicator circuit uses a current-limiting resistor and a light-emitting diode to indicate the power supply.

[0060] Power safety circuits include Y capacitors of varying capacitances, connected in parallel between the power supply, ground, and the protective earth (PE) layer. Safety capacitors are designed to prevent electric shock and personal injury should a capacitor fail. The discharge mechanism of safety capacitors differs from that of ordinary capacitors: ordinary capacitors retain charge for a long time after the external power supply is disconnected, leading to electric shock if touched, while safety capacitors do not. For safety and EMC considerations, safety capacitors are typically added at the power input and interface. At the AC power input, three safety capacitors are generally required to suppress conducted EMI interference. Safety capacitors are used in power filters to filter power supply, common-mode, and differential-mode interference. Power filters utilize numerous high-capacity electrolytic capacitors, NF-level ceramic capacitors, and PF-level ceramic capacitors for power filtering. Ceramic capacitors eliminate high-frequency interference, while electrolytic capacitors eliminate low-frequency interference. The entire circuit is a filter circuit designed to efficiently filter out power supply ripple and interference.

[0061] The 20-pin horn-shaped socket handles both power output and power fault signal output. The 3-pin socket is derived from the 5-pin socket by removing pins. Due to the high-voltage output, a spacer design is used to maintain a sufficient creepage distance, ensuring adequate safety during operation and fault conditions. After the DC power input arrives, it first passes through two one-time fast-blow fuses. When a power supply fault occurs, these fuses quickly disconnect the connection from the input, providing essential protection for both the input and the entire power supply. Then, a high-voltage input absorption capacitor is sandwiched between the positive, negative, and midpoints of the input to absorb interference from the external DC input.

[0062] This invention provides a maximum input / output DC voltage of 1000V and an input / output AC voltage of 450V. It features a high switching frequency and utilizes 48 high-voltage IGBTs as the main power devices. Each switching transistor experiences low stress and has a large margin during operation, resulting in stable system operation. The novel layout significantly reduces costs while ensuring stable operation at 125kW, giving it a strong competitive edge in the power electronics industry.

[0063] The above embodiments are merely one of the implementation methods to achieve the technical solution of this utility model. The scope of the system to be protected by this utility model is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model.

Claims

1. An energy storage device based on IGBT tube power 125KW, characterized in that, The system includes a housing and several IGBT transistors, a drive control module, a heat sink, several temperature sensors, several small fans, a battery pack, system circuitry, and a voltage access module. The IGBT transistors are evenly distributed within the housing, employing a parallel current-sharing design, and each IGBT is electrically connected to the drive control module. The drive control module is electrically connected to both the battery pack and the system circuitry. The heat sink is a small T-shaped heat sink with IGBT transistors arranged at equal intervals on both sides. The small fans are evenly distributed on one side of the housing, and each small fan is electrically connected to the system circuitry. Ventilation openings are located on the opposite side of the housing, opposite the small fans. The temperature sensors are evenly distributed on the heat sink, and each temperature sensor is electrically connected to the system circuitry, used for zoned feedback control of fan cooling. The voltage access module is electrically connected to the drive control module and can be switched on / off with an external power grid.

2. The energy storage device based on IGBT tube power 125KW according to claim 1, characterized in that, The number of IGBTs is at least 48, and the IGBTs are connected in parallel.

3. The energy storage device based on IGBT tube power 125KW according to claim 1, characterized in that, The number of heat sinks is at least 6.

4. The energy storage device based on IGBT tube power 125KW according to claim 1, characterized in that, The number of small fans is at least 4, and the specifications of the small fans are 9238.

5. The energy storage device based on IGBT tube power 125KW according to claim 1, characterized in that, The system circuit includes an interface board, an adapter board, a computing board, and a power supply board; the drive control module is electrically connected to the adapter board through the power supply board; the adapter board is electrically connected to the computing board, the interface board, and the small fan respectively; the adapter board is also electrically connected to the drive control module in PWM mode.

6. The energy storage device based on IGBT tubes with a power of 125KW according to claim 5, characterized in that, The adapter board and the interface board are connected via a current sampling circuit, a 485 circuit, a reserved voltage sampling circuit, an ADDR circuit, a BOOT circuit, and a reserved dry contact circuit.

7. The energy storage device based on IGBT tube power 125KW according to claim 5, characterized in that, The adapter board and the computing board are connected via a 96-channel ohm plug.

8. The energy storage device based on IGBT tube power 125KW according to claim 5, characterized in that, The adapter board and the voltage access module are electrically connected through a relay control circuit and a voltage sampling circuit.

9. The energy storage device based on IGBT tube power 125KW according to claim 5, characterized in that, It also includes a large screen, and the interface board is electrically connected to the large screen via a 485 circuit. The 485 chip is an NSi83085 model. The interface board is also electrically connected to the CT sampling equipment to collect current signals.

10. The energy storage device based on IGBT tube power 125KW according to claim 5, characterized in that, The power board includes a transformer for converting the voltage of the drive control module into the stable voltage and current required by the adapter board.

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