Battery energy storage device based on two-phase liquid cooling technology

Abstract

The utility model provides a battery energy storage device based on a two-phase liquid cooling technology, the battery energy storage device is installed in an energy storage cabinet, the battery energy storage device is divided into four parts, the battery energy storage device comprises a battery chamber, the battery chamber is arranged at the right side of the lower part of the energy storage cabinet and comprises four battery modules; the electrical room is arranged on the left side of the energy storage cabinet and comprises a PCS, a DC / DC and a direct-current high-voltage box; the control room is arranged in the middle of the upper part of the energy storage cabinet and comprises an operation indicating lamp, an energy management system, an emergency stop switch, a refrigerator power switch and an energy management system control power switch; the cooling chamber is arranged on the right side of the upper part of the energy storage cabinet and comprises a two-phase liquid cooling unit; the two-phase liquid cooling technology is adopted, and efficient heat dissipation is achieved through the phase change heat absorption characteristic. The cooling pipeline is connected with the cold plate of the battery module in a bottom-feeding and top-returning manner, so that the cooling medium can fully absorb the heat of the battery module, a large amount of heat is taken away through the phase change process, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of energy storage technology and is mainly applied to the battery thermal management system in electrochemical energy storage systems. It relates to the heat dissipation technology of high power density battery modules, specifically a battery energy storage device based on two-phase liquid cooling technology. This device aims to provide an efficient and uniform heat dissipation solution for battery modules, thereby ensuring the safe and stable operation of the energy storage system and improving battery life and system performance. Background Technology

[0002] With the rapid development of electrochemical energy storage technology, represented by lithium-ion batteries, it has been widely used in power system peak shaving and frequency regulation, renewable energy grid connection, and distributed energy systems. However, as energy storage systems develop towards larger capacity and higher power density, battery thermal management issues are becoming increasingly prominent, becoming a key factor restricting the performance and lifespan of energy storage systems.

[0003] Batteries generate a significant amount of Joule heat during operation, especially under high-rate charge and discharge conditions, where heat accumulation is even more pronounced. Traditional air cooling or single-phase liquid cooling methods have limited heat dissipation efficiency, making it difficult to meet the heat dissipation requirements of high-power energy storage devices. Air cooling systems suffer from uneven heat dissipation, high energy consumption, and high noise, while single-phase liquid cooling systems, although having a higher heat transfer coefficient, are still insufficient in addressing localized overheating issues within the battery pack.

[0004] Two-phase liquid cooling technology, as a novel and efficient heat dissipation method, can significantly improve heat dissipation efficiency by utilizing the phase change endothermic properties of the cooling medium. This technology leverages the characteristic that the cooling medium absorbs a large amount of latent heat during phase change, achieving higher heat flux density and more uniform temperature distribution. However, the application of existing two-phase liquid cooling technology in the energy storage field still faces many challenges: First, the flow and heat transfer characteristics of two-phase fluids are complex and difficult to control precisely; second, system design needs to consider the special structure and operating environment of battery modules; and third, reliable temperature monitoring and intelligent control systems need to be developed to ensure the safe and stable operation of the system.

[0005] To address the aforementioned problems, this invention proposes a battery energy storage device based on two-phase liquid cooling technology. This device achieves efficient and uniform heat dissipation by optimizing the design of the two-phase liquid cooling unit and cooling pipelines, combined with intelligent temperature monitoring and regulation functions. Summary of the Invention

[0006] The purpose of this invention is to provide a battery energy storage device based on two-phase liquid cooling technology, which solves the problem that traditional air cooling or single-phase liquid cooling methods cannot meet the heat dissipation requirements of high-power energy storage devices, especially under high load conditions. Uneven heat dissipation may lead to excessively high battery temperature, which may cause thermal runaway or even safety accidents. Existing two-phase liquid cooling systems are difficult to integrate with energy storage devices.

[0007] To address the aforementioned problems, this utility model provides a battery energy storage device based on two-phase liquid cooling technology, comprising at least one energy storage cabinet, which is spatially divided into four parts, namely:

[0008] The battery compartment, located on the lower right side of the energy storage cabinet, contains four battery modules;

[0009] The electrical room, located to the left of the energy storage cabinet, includes a PCS (Power Conversion System), a DC / DC converter, and a DC high-voltage box.

[0010] The control room, located in the upper middle part of the energy storage cabinet, includes operation indicator lights, an energy management system, an emergency stop switch, a chiller power switch, and an energy management system control power switch.

[0011] The cooling chamber, located on the upper right side of the energy storage cabinet, contains a two-phase liquid cooling unit.

[0012] Preferably, a partition is provided between the four parts of the battery energy storage device. The partition is made of fireproof and insulating material and has through holes for liquid cooling pipes and wiring harnesses to pass through.

[0013] Preferably, the two-phase liquid cooler has temperature monitoring and automatic adjustment functions and is connected to the cooling pipeline; the cooling medium is pentafluoropropane, the cooling pipeline is made of copper pipe material, and it is connected to the cold plate of the battery module in a bottom-feed and top-return manner; the section of the pipeline connected to the cold plate of the battery module is equipped with a check valve, and the connection between the pipeline and the return port of the two-phase liquid cooler is equipped with a breather valve.

[0014] Preferably, the battery module includes a battery assembly, a thermal management system, a battery management system, and a safety protection component: the battery module is bound and fixed by steel cable ties, and the bottom is wrapped with high-strength insulating material; the battery modules are connected by deformable copper busbars and connected in series by soft copper wires; the battery assembly consists of 30 cells connected in series; the thermal management system includes a two-phase liquid cooling plate and a temperature sensor, and a cold plate is provided on the top of the battery module, which is connected to cooling pipes.

[0015] Preferably, the battery management system is divided into a two-level architecture: the battery management unit is responsible for collecting data on the voltage, temperature, and pressure of each individual cell in the battery box, and uploading the processed data to the battery cluster management unit via a daisy chain; the battery cluster management unit is located in the DC high-voltage box, receives information from the battery management unit, detects the voltage and current of the battery cluster, and uploads the processed data to the energy management system via the CAN bus.

[0016] Preferably, the safety protection component uses high-efficiency perfluorohexanone as the extinguishing medium and is equipped with a four-in-one high-sensitivity fire sensor to monitor carbon monoxide, volatile organic compounds, temperature and smoke levels in real time, and transmits the values ​​to the energy management system in real time via CAN bus to ensure the safety of the energy storage device.

[0017] Preferably, the energy management system is integrated with various subsystems in the energy storage device in real time, including the battery management system, cooling system and safety protection system, to monitor the operating status of each component in the energy storage device;

[0018] The energy management system uses CAN bus communication to collect key data such as voltage, current, temperature, and pressure of the battery module, as well as operating parameters of the cooling system and monitoring data of safety protection components.

[0019] The energy management system can detect abnormalities in the energy storage device in real time and issue alarms promptly.

[0020] The energy management system can trigger an emergency stop switch when a serious fault or safety hazard is detected.

[0021] The quantity management system is equipped with a display module that can display equipment operating parameters, fault information, and historical data;

[0022] The energy management system allows users to remotely control the energy storage device, performing operations such as starting, stopping, and setting parameters.

[0023] The energy management system stores historical data on the operation of the devices.

[0024] Preferably, the PCS can realize the AC / DC conversion of current between the battery and the power grid; the DC / DC converter realizes the boost or buck of DC current through high-frequency switching technology, and is connected to the PCS through DC positive and DC negative wiring harnesses.

[0025] Preferably, the DC high-voltage box includes power distribution, protection, safety isolation, and current detection functions. It is connected to the battery compartment via DC positive and DC negative wiring harnesses, and is also connected to a DC / DC converter.

[0026] Preferably, the operation indicator light includes multiple color indicator lights, with different colors corresponding to normal operation, warning status and fault status respectively;

[0027] The energy management system is equipped with a display module for displaying equipment operating parameters and fault information, and for performing relevant control operations on the equipment;

[0028] The chiller power switch and the energy management system control power switch are used to control the on / off state of the chiller power supply and the energy management system control power supply.

[0029] Emergency stop switches are used to stop equipment operation in emergency situations and are clearly marked and equipped with protective measures.

[0030] This utility model has the following beneficial effects:

[0031] This invention employs two-phase liquid cooling technology, achieving efficient heat dissipation through phase change heat absorption characteristics. The cooling pipes are connected to the cold plate of the battery module using a bottom-supply, top-return configuration, ensuring that the cooling medium can fully absorb the heat from the battery module and remove a significant amount of heat through the phase change process. Compared to traditional air-cooled or single-phase liquid cooling systems, the two-phase liquid cooling system improves heat exchange efficiency, effectively reduces the maximum temperature of the battery module, and controls the uniformity of temperature distribution within the battery module within a certain range, significantly extending the battery's lifespan.

[0032] This invention features a two-tiered battery management system (BMS) and energy management system (EMS), capable of real-time monitoring of key parameters such as voltage, current, and temperature of the battery module, and achieving data exchange and intelligent control via a CAN bus. The energy management system dynamically adjusts the operating status of the two-phase liquid cooler based on battery status and operational requirements, ensuring the battery module always operates within its optimal temperature range. Simultaneously, the energy management system optimizes charging and discharging strategies, improving the energy utilization efficiency of the energy storage system and reducing operating energy consumption.

[0033] This utility model divides the energy storage cabinet into four functional areas: a battery compartment, an electrical compartment, a control compartment, and a cooling compartment. These areas are isolated by fireproof and insulating partitions, and the liquid cooling pipes and wiring harnesses are connected via through-holes. This modular design not only improves system maintainability but also facilitates capacity expansion or component replacement according to actual needs. The two-phase liquid-cooled unit in the cooling compartment and the battery modules in the battery compartment both adopt standardized interface designs, facilitating quick installation and disassembly and reducing maintenance costs. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the battery energy storage device according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the power structure of the battery energy storage device according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the communication structure of the battery energy storage device according to an embodiment of the present invention.

[0037] Figure labeling: 1-Energy storage cabinet, 101-Return pipe perforation, 102-Inlet pipe perforation, 103-Baffle plate, 2-Cooling chamber, 201-Two-phase refrigeration unit, 202-Two-phase refrigeration unit switch, 203-Two-phase refrigeration unit outlet, 204-Two-phase refrigeration unit return port, 205-Cooling pipe, 206-Check valve, 3-Battery compartment, 301-Battery module, 302-Battery module inlet, 303-Battery module outlet, 304-Battery module positive electrode, 30 5-Battery module negative terminal, 306-Battery module communication interface, 4-Control room, 401-EMS (Energy Management System), 402-Running indicator light, 403-Communication interface, 404-Chiller power switch and energy management system control power switch, 405-Emergency stop switch, 5-Electrical room, 501-PCS, 502-DC / DC, 503-DC high voltage box, 504-DC high voltage box manual switch, 505-DC high voltage box positive terminal, 506-DC high voltage box negative terminal. Detailed Implementation

[0038] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0039] To fully understand this utility model, detailed steps and structures will be presented in the following description to illustrate the technical solution of this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0040] like Figures 1-3 The battery energy storage device based on two-phase liquid cooling technology shown in this utility model includes at least one energy storage cabinet 1, which is spatially divided into four main functional areas: battery room 3, electrical room 5, control room 4 and cooling room 2.

[0041] Battery compartment 3 is located on the lower right side of energy storage cabinet 1, and contains four battery modules 301. Each battery module 301 consists of 30 cells connected in series. The cells are connected by deformable copper busbars and then connected in series by soft copper wires to form a battery cluster. The bottom of the battery module 301 is wrapped with high-strength insulating material and secured with steel cable ties to ensure the stability of the module during operation. The top of the battery module is equipped with a cold plate, which is connected to the cooling pipe 205 for heat dissipation. The cooling pipe 205 is connected to the cold plate in a bottom-feed, top-return manner. The section of the cooling pipe 205 connecting to the cold plate is equipped with a check valve 206 to prevent the cooling medium from flowing back. A breather valve is installed at the connection between the pipe and the return port 204 of the two-phase liquid cooler to ensure the pressure balance of the cooling system.

[0042] Electrical compartment 5 is located to the left of the energy storage cabinet. From top to bottom, the equipment consists of a PCS (Power Conversion System) 501, a DC / DC converter 502, and a DC high-voltage box 503. PCS501 is responsible for AC / DC conversion between the battery and the grid, enabling bidirectional energy flow. PCS501 is connected to the DC high-voltage box 503 via DC positive and DC negative wiring harnesses, ensuring energy transfer between battery module 301 and the grid. DC / DC 502 uses high-frequency switching technology to boost or buck the DC current, ensuring voltage matching between battery module 301 and PCS501. DC / DC 502 is connected to PCS501 via DC positive and DC negative wiring harnesses. The DC high-voltage box 503 has power distribution, protection, safety isolation, and current detection functions. It is connected to battery compartment 3 and DC / DC 502 via DC positive and DC negative wiring harnesses, ensuring the safe operation of the power system.

[0043] The control room 4 is located in the upper center of the energy storage cabinet and includes operation indicator lights 402, an energy management system 401, an emergency stop switch 405, a chiller power switch, and an energy management system control power switch 404. The operation indicator lights 402 use different colors to display the equipment's operating status: green indicates normal operation, yellow indicates a warning status, and red indicates a fault status. The energy management system 401 is equipped with a display module to display equipment operating parameters and fault information, and to perform related control operations on the equipment. The energy management system 401 communicates with the battery management system, PCS 501, DC / DC 502, and DC high-voltage box 503 via a CAN bus to achieve intelligent management of the entire energy storage device. The emergency stop switch 405 is used to stop equipment operation in emergencies and has clear markings and protective measures to ensure that operators can quickly disconnect the power. The chiller power switch and the energy management system control power switch 404 control the on / off of the chiller power and energy management system control power, ensuring the normal operation of the cooling system and energy management system.

[0044] Cooling chamber 2 is located on the upper right side of the energy storage cabinet and contains a two-phase liquid cooler unit 201. The two-phase liquid cooler unit 201 has temperature monitoring and automatic adjustment functions, and the cooling medium is pentafluoropropane. Cooling pipe 205 is made of copper and connects to the cold plate of the battery module 301 using an upward-feeding and upward-returning method, ensuring that the gaseous cooling medium after phase change can return to the two-phase cooler. A check valve 206 is installed on the section of cooling pipe 205 connecting to the cold plate of the battery module 301 to prevent backflow of the cooling medium. A breather valve is installed at the connection between the pipe and the return port 204 of the two-phase liquid cooler unit to ensure pressure balance in the cooling system.

[0045] The four sections of the energy storage cabinet 1 are separated by partitions 103. The partitions 103 are made of fireproof and insulating materials and have through holes for liquid cooling pipes 205 and wiring harnesses to pass through, so as to ensure safe isolation and functional independence between the areas.

[0046] like Figure 2 As shown, the power structure of the battery energy storage device of this utility model mainly includes a battery module 301, a PCS (Power Conversion System) 501, a DC / DC (Direct-to-Direct-to-Converter) 502, and a DC high-voltage box 503. The power flow during charging and discharging is as follows:

[0047] During charging: When the power grid supplies power to the battery storage device, the AC power from the grid is converted to DC power by the PCS (Power Conversion System) 501. The PCS 501 is connected to the DC / DC (DC-to-DC Converter) 502 via DC positive and DC negative wiring harnesses, transmitting the converted DC power to the DC / DC converter 502. Upon receiving the DC power from the PCS 501, the DC / DC converter 502 uses high-frequency switching technology to boost the DC power, ensuring the voltage matches the charging requirements of the battery module. The DC / DC converter 502 then transmits the power to the DC high-voltage box 503 via the DC positive and DC negative wiring harnesses. The DC power regulated by the DC high-voltage box 503 is then transmitted to the battery cluster via the DC positive and DC negative wiring harnesses, and the battery cluster begins charging. During charging, the two-phase liquid cooling unit 201 cools the battery module 301 through cooling pipes 205, ensuring the battery temperature remains within a safe range.

[0048] During discharge: When the energy storage device supplies power to the grid, battery module 301 transmits DC power to DC high-voltage box 503 via DC positive and DC negative wiring harnesses. After receiving the power, DC high-voltage box 503 distributes the power to DC / DC 502 via DC positive and DC negative wiring harnesses. DC / DC 502 uses high-frequency switching technology to step down the DC power, ensuring the voltage matches the input requirements of PCS501. The regulated DC power is then transmitted to PCS501 via DC positive and DC negative wiring harnesses. PCS501 converts the DC power to AC power and transmits it to the grid via the grid interface for user use. During discharge, two-phase liquid cooling unit 201 cools battery module 301 via cooling pipes 205, ensuring the battery temperature remains within a safe range.

[0049] like Figure 3 As shown, the communication structure of the battery energy storage device of this utility model mainly includes a battery management system (BMS), an energy management system (EMS) 401, a DC / DC converter 502, a PCS 501, a chiller controller, and a fire protection system (safety protection components). The communication content and methods between the devices during charging and discharging are as follows:

[0050] During charging: The Battery Management Unit (BMU) collects real-time voltage, current, and temperature data for each individual battery cell and transmits the data to the Battery Cluster Management Unit (BCMU) via a daisy-chain. The BCMU processes the data and uploads it to the Energy Management System (EMS) 401 via the CAN bus. The EMS 401 intelligently schedules the charging process based on battery status and grid demand, and sends control commands to the PCS 501 and DC / DC 502. The DC / DC 502 receives commands from the EMS 401 via the CAN bus, adjusts the DC current voltage to ensure that the charging voltage of the battery module 301 matches the output voltage of the PCS 501. The DC / DC 502 feeds back the adjusted voltage and current data to the EMS 401 via the CAN bus, and the EMS 401 further optimizes the charging strategy based on the feedback data. The PCS 501 receives commands from the EMS 401 via the CAN bus, converts the AC power from the grid to DC power, and transmits the converted DC power to the DC / DC 502 via a DC high-voltage box. The PCS501 feeds back voltage, current, and power data during the conversion process to the EMS401 via the CAN bus. The EMS401 adjusts the output of the PCS501 based on the feedback data. During charging, the battery module generates heat. The EMS401 sends the temperature data and control commands of the battery module 301 to the chiller controller via the CAN bus. The chiller controller adjusts the operating status of the two-phase liquid cooling unit 201 according to the commands to ensure that the battery temperature remains within a safe range. The chiller controller feeds back the operating status and cooling effect data to the EMS401 via the CAN bus. The fire protection system monitors key indicators such as carbon monoxide, volatile organic compounds, temperature, and smoke in real time through a four-in-one high-sensitivity fire sensor and transmits the monitoring data to the EMS401 via the CAN bus. If an abnormality is detected, the EMS401 will immediately issue an alarm and trigger the emergency stop switch 405 to stop the charging process.

[0051] During discharge: The Battery Management Unit (BMU) collects real-time voltage, current, and temperature data for each individual cell and transmits the data to the Battery Cluster Management Unit (BCMU) via a daisy-chain. The BCMU processes the data and uploads it to the Energy Management System (EMS) 401 via the CAN bus. The EMS 401 intelligently schedules the discharge process based on battery status and grid demand, sending control commands to the PCS 501 and DC / DC 502. The DC / DC 502 receives commands from the EMS 401 via the CAN bus, adjusting the DC current voltage to ensure the discharge voltage of battery module 301 matches the input voltage of the PCS. The DC / DC 502 feeds back the adjusted voltage and current data to the EMS 401 via the CAN bus, allowing the EMS 401 to further optimize the discharge strategy based on the feedback data. The PCS 501 receives commands from the EMS 401 via the CAN bus, converts the DC power from battery module 301 to AC power, and then supplies the converted AC power to the grid. PCS501 feeds back voltage, current, and power data during the conversion process to EMS401 via the CAN bus. EMS401 adjusts its output based on this feedback. During discharge, battery module 301 also generates heat. EMS401 sends temperature data and control commands for battery module 301 to the chiller controller via the CAN bus. The chiller controller adjusts the operating status of the two-phase liquid cooling unit 201 according to the commands to ensure the battery temperature remains within a safe range. The chiller controller feeds back operating status and cooling effect data to EMS401 via the CAN bus. The fire protection system monitors key indicators such as carbon monoxide, volatile organic compounds, temperature, and smoke in real time using a four-in-one high-sensitivity fire sensor and transmits the monitoring data to EMS401 via the CAN bus. If an abnormality is detected, EMS401 immediately issues an alarm and triggers emergency stop switch 405 to stop the discharge process.

[0052] The preferred embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, nor is it limited to battery energy storage devices based on two-phase liquid cooling technology. Devices and structures not described in detail herein should be understood as being implemented in a conventional manner within the art. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this utility model. This does not affect the essential content of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, still fall within the protection scope of the technical solution of this utility model.

Claims

1. A battery energy storage device based on two-phase liquid cooling technology, characterized in that, It includes at least one energy storage cabinet, which is spatially divided into four parts, including: The battery compartment, located on the lower right side of the energy storage cabinet, contains four battery modules; The electrical room, located to the left of the energy storage cabinet, includes the PCS, DC / DC converter, and DC high-voltage box. The control room, located in the upper middle part of the energy storage cabinet, includes operation indicator lights, energy management system, emergency stop switch, chiller power switch, and energy management system control power switch. The cooling chamber, located on the upper right side of the energy storage cabinet, contains a two-phase liquid cooling unit.

2. The battery energy storage device according to claim 1, characterized in that, The battery energy storage device is provided with a partition between its four parts. The partition is made of fireproof and insulating material and has through holes for liquid cooling pipes and wiring harnesses to pass through. The two-phase liquid cooler unit has temperature monitoring and automatic adjustment functions; The two-phase liquid cooler is connected to the cooling pipeline; the cooling medium is pentafluoropropane.

3. The battery energy storage device according to claim 2, characterized in that, The cooling pipes are copper pipes; The top of the battery module is equipped with a cold plate, which is connected to a cooling pipe. The cooling pipes are connected to the cold plate of the battery module using a bottom-feed, top-return method. All sections of the cooling pipes connected to the cold plate of the battery module are equipped with check valves. A breather valve is installed at the connection point between the cooling pipeline and the return port of the two-phase liquid cooler.

4. The battery energy storage device according to claim 1, characterized in that, The battery module includes a battery assembly, a thermal management system, a battery management system, and safety protection components; The battery module is secured by steel cable ties and its bottom is wrapped with high-strength insulating material. The battery modules are connected by deformable copper busbars and connected in series by soft copper wires. The battery assembly consists of 30 cells connected in series.

5. The battery energy storage device according to claim 4, characterized in that, The thermal management system includes a two-phase liquid cooling plate and a temperature sensor; The safety protection component uses perfluorohexanone as the extinguishing medium and is equipped with a four-in-one high-sensitivity fire sensor to monitor key indicators such as carbon monoxide, volatile organic compounds, temperature, and smoke in real time, and transmits the values ​​to the energy management system instantly via the CAN bus.

6. The battery energy storage device according to claim 4, characterized in that, The battery management system is divided into a two-level architecture, including: The battery management unit is responsible for collecting data on the voltage, temperature, and pressure of each individual cell in the battery box, and then uploading the processed data to the battery cabinet cluster management unit via a daisy chain. The battery cluster management unit, located in the DC high-voltage box, receives information from the battery management unit, detects the voltage and current of the battery clusters, processes the data, and uploads it to the energy management system via the CAN bus.

7. The battery energy storage device according to claim 1, characterized in that, The energy management system integrates with various subsystems in the energy storage device in real time, including the battery management system, cooling system, and safety protection system, to monitor the operating status of each component in the energy storage device. The energy management system collects data on the voltage, current, temperature, and pressure of the battery module, as well as the operating parameters of the cooling system and the monitoring data of the safety protection components, through CAN bus communication. The energy management system detects abnormalities in the energy storage device in real time and issues alarms promptly. The energy management system triggers an emergency stop switch when it detects a serious fault or safety hazard. The energy management system is equipped with a display module for displaying equipment operating parameters, fault information, and historical data; The energy management system stores historical data on the operation of the devices.

8. The battery energy storage device according to claim 1, characterized in that, The PCS is used for AC / DC conversion of current between the battery and the power grid; The DC / DC converter uses high-frequency switching technology to boost or buck the DC current. The DC / DC converter is connected to the PCS via a DC positive terminal harness and a DC negative terminal harness.

9. The battery energy storage device according to claim 1, characterized in that, The DC high-voltage box includes power distribution, protection, safety isolation and current detection functions. It is connected to the battery compartment through DC positive and DC negative wiring harnesses, and is also connected to a DC / DC converter through DC positive and DC negative wiring harnesses.

10. The battery energy storage device according to claim 1, characterized in that, The operation indicator lights include multiple color indicator lights, with different colors corresponding to normal operation, warning status and fault status, respectively; The energy management system is equipped with a display module for displaying equipment operating parameters and fault information, and for performing relevant control operations on the equipment; The chiller power switch and the energy management system control power switch are used to control the on / off state of the chiller power supply and the energy management system control power supply. The emergency stop switch is used to stop the equipment in an emergency and has clear markings and protective measures.

Images