An integrated system of a direct current side energy storage cabinet and a wall-mounted hybrid inverter

Abstract

The utility model relates to the field of energy storage and power electronics, disclose a kind of integrated system of dc side energy storage cabinet and wall-mounted hybrid inverter, including cabinet, the inner wall of cabinet is equipped with multiple battery modules, the inner wall of cabinet is equipped with high-voltage box, heat dissipation air conditioner, energy management module, display screen and fire-fighting module, the outer wall of cabinet is fixedly connected with mounting bracket, the outer wall of mounting bracket is equipped with inverter module, the bottom of cabinet is provided with damping assembly.In the utility model, through direct connection of DC bus to reduce energy conversion link, combined with modular battery expansion, distributed heat dissipation and intelligent safety protection, realize high efficiency, high density, high reliability of energy management, realize kWh hybrid reverse large-capacity energy storage, photovoltaic / mains / energy storage intelligent collaborative control, applicable to industrial and commercial and microgrid scene, significantly reduce electricity cost and improve system stability.

Description

Technical Field

[0001] This utility model relates to the field of energy storage and power electronics technology, and in particular to an integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter. Background Technology

[0002] With the development of new energy technologies, the penetration rate of renewable energy power generation (such as photovoltaic power generation and wind power generation) is constantly increasing. However, the intermittent and fluctuating characteristics of renewable energy make it difficult for its power output to directly match the stable power demand of the grid or users. As a result, energy storage is gradually becoming a market hotspot, and cabinet-type energy storage systems are becoming a trend.

[0003] Traditional energy storage systems often employ a split-type architecture. Their typical workflow involves the battery pack outputting DC power, which is then converted to AC power by an AC / DC converter, distributed by a distribution cabinet, and finally converted back to DC power by a DC / AC inverter for use by loads or fed into the grid. This multi-stage conversion not only increases energy loss but also results in bulky equipment, complex wiring, and high installation and maintenance costs. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides an integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter, which aims to improve the problems of traditional energy storage system equipment being bulky, having complex wiring, high installation and maintenance costs, and low efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter, including a cabinet, multiple battery modules installed on the inner wall of the cabinet, a high-voltage box, a cooling air conditioner, an energy management module, a display screen and a fire protection module installed on the inner wall of the cabinet, a mounting bracket fixedly connected to the outer wall of the cabinet, an inverter module installed on the outer wall of the mounting bracket, and a vibration damping component provided at the bottom of the cabinet.

[0006] Preferably, the vibration damping component includes a plurality of counterweight balls, the outer wall of the counterweight balls being slidably connected to the inner wall of the cabinet, and a sliding groove being provided at the bottom end of the cabinet, the outer wall of the counterweight balls being slidably connected to the inner wall of the sliding groove.

[0007] Preferably, the battery module includes battery cells and a BMS slave board, the energy management module includes an MCU control board, a communication chip, a signal conditioning circuit and a drive output circuit, the inverter module includes an MPPT controller, a DC / AC inverter unit and a grid connection interface, and the fire protection module includes a main control board, a solenoid valve, an alarm, a fire extinguishing agent and a sensor group.

[0008] Preferably, the cells of multiple battery modules are connected in parallel, the output terminal of each cell is electrically connected to the BMS slave board, the rated capacity of each battery module is kWh and it supports hot-swapping, the output terminal of each battery module is electrically connected to the input terminal of the high-voltage box, and the BMS slave board is communicatively connected to the energy management module.

[0009] Preferably, the MCU control board is communicatively connected to the communication chip, the output terminal of the MCU control board is electrically connected to the signal conditioning circuit, the output terminal of the MCU control board is electrically connected to the drive output circuit, the communication chip is communicatively connected to the BMS slave board, the display screen and the inverter module respectively, the MCU control board is electrically connected to the smoke sensor, the signal conditioning circuit is electrically connected to the output terminal of the temperature sensor, and the output terminal of the drive output circuit is electrically connected to the alarm and the solenoid valve respectively.

[0010] Preferably, the output terminal of the high-voltage box is directly connected to the inverter module via a DC bus, and the DC bus passes through the cable protection coil installed in the cabinet to achieve a sealed connection. The MPPT controller is electrically connected to the DC / AC inverter unit via the DC bus, the output terminal of the DC / AC inverter unit is electrically connected to the grid connection interface, and the input terminal of the MPPT controller is communicatively connected to the energy management module.

[0011] Preferably, the sensor group includes a temperature sensor and a smoke sensor. The output terminals of the temperature sensor and the smoke sensor are both electrically connected to the main control board. The output terminals of the main control board are electrically connected to the alarm and the solenoid valve, respectively. The solenoid valve is installed on the outer wall of the fire extinguishing agent, and the fire extinguishing agent is installed on the outer wall of the battery module. The input terminal of the main control board is communicatively connected to the energy management module.

[0012] Preferably, the inner wall of the cabinet is equipped with a power distribution unit, the top of the cabinet is equipped with multiple lifting rings, the outer wall of the cabinet has multiple forklift transport ports, the cooling air conditioner is located at the top of the cabinet, and the air duct of the cooling air conditioner is connected to the battery module area.

[0013] This utility model has the following beneficial effects: 1. In this utility model, the energy conversion links are reduced by direct DC bus connection, and the modular battery expansion, distributed heat dissipation and intelligent safety protection are combined to achieve high-efficiency, high-density and high-reliability energy management, realize 215kWh hybrid inverter large-capacity energy storage, and intelligent collaborative control of photovoltaic / mains power / energy storage. It is suitable for industrial and commercial and microgrid scenarios, significantly reduces electricity costs and improves system stability.

[0014] 2. In this utility model, by opening a sliding groove at the bottom of the cabinet and sliding multiple counterweight balls in the sliding groove, vibration energy is offset by the shift of the center of mass, thereby increasing the overall seismic performance of the system and ensuring the stability of the system operation. Attached Figure Description

[0015] Figure 1 This is a front view of an integrated system of a DC-side energy storage cabinet and a wall-mounted hybrid inverter proposed in this utility model; Figure 2 This is a plan view of the internal structure of an integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter proposed in this utility model; Figure 3 This is a three-dimensional view of the internal structure of an integrated system of a DC-side energy storage cabinet and a wall-mounted hybrid inverter proposed in this utility model. Figure 4 This is a schematic diagram of the bottom structure of the cabinet of an integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter proposed in this utility model; Figure 5 This is a schematic block diagram illustrating the module connection relationship of an integrated system of a DC-side energy storage cabinet and a wall-mounted hybrid inverter proposed in this utility model. Figure 6 This utility model presents a schematic block diagram of the battery module of an integrated system of a DC-side energy storage cabinet and a wall-mounted hybrid inverter. Figure 7 This utility model presents a schematic block diagram of an inverter module for an integrated system of a DC-side energy storage cabinet and a wall-mounted hybrid inverter. Figure 8 This is a schematic block diagram of the energy management module of an integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter proposed in this utility model; Figure 9 This utility model presents a schematic block diagram of a fire protection system for an integrated system of a DC-side energy storage cabinet and a wall-mounted hybrid inverter.

[0016] Legend: 1. Cabinet; 2. Battery module; 3. High voltage box; 4. Cooling and air conditioning; 5. Energy management module; 6. Display screen; 7. Inverter module; 8. Mounting bracket; 9. Fire protection module; 901. Alarm; 902. Fire extinguishing agent; 903. Sensor group; 10. Power distributor; 11. Cable sheath; 12. Lifting ring; 13. Forklift transport port; 14. Sliding groove; 15. Counterweight ball. Detailed Implementation

[0017] 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 are within the protection scope of this utility model.

[0018] Reference Figures 1-3 This utility model provides an embodiment of an integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter, including a cabinet 1. Multiple battery modules 2 are installed on the inner wall of the cabinet 1. A high-voltage box 3, a heat dissipation air conditioner 4, an energy management module 5, a display screen 6 and a fire protection module 9 are installed on the inner wall of the cabinet 1. A mounting bracket 8 is fixedly connected to the outer wall of the cabinet 1. An inverter module 7 is installed on the outer wall of the mounting bracket 8. A vibration damping component is provided at the bottom of the cabinet 1.

[0019] Specifically, cabinet 1 consists of multiple parallel standardized battery modules 2 with a total capacity of 215kWh. A wall-mounted hybrid inverter module 7, mounted on the outside of cabinet 1 via a fixed mounting bracket 8, integrates a DC / AC inverter module, MPPT controller, and grid connection interface. It is directly connected to the high-voltage box 3 via a DC bus and cable sheath 11. An EMS energy management module 5 collects photovoltaic power, battery SOC, load demand, and grid electricity price signals; monitors the DC bus voltage in real time and controls the multi-source energy distribution from photovoltaic, energy storage, and the grid; and responds to abnormal battery temperature or voltage. Triggering the graded protection mechanism and switching to redundant power supply, the operating status and data of each system device can be viewed in real time through the WEB interface or background communication. On-site, various data of the energy storage system can be monitored and viewed at any time through the human-machine interaction display screen 6. The fire protection module 9 is integrated inside the cabinet 1. The EMS energy management module 5 communicates and controls the monitoring of various data of the fire protection facilities, realizing the maximum effective utilization of aerosol extinguishing agent 902, real-time transmission of information from the cabinet temperature and smoke sensors, and real-time status transmission of the external audible and visual alarm 901, thus maximizing the protection of electrical safety.

[0020] Reference Figure 1 and Figure 4 The vibration damping component includes multiple counterweight balls 15. The outer wall of the counterweight balls 15 is slidably connected to the inner wall of the cabinet 1. A sliding groove 14 is provided at the bottom of the cabinet 1, and the outer wall of the counterweight balls 15 is slidably connected to the inner wall of the sliding groove 14.

[0021] Specifically, when the cabinet 1 is subjected to horizontal vibration, the counterweight ball 15 slides in the opposite direction along the sliding groove 14 under the action of inertia, and the vibration energy is offset by the shift of the center of mass. Rubber vibration damping pads are also symmetrically set at the four corners of the bottom of the cabinet 1, which together with the counterweight ball 15 form a multi-level vibration damping structure to ensure the stability of the system operation.

[0022] Reference Figures 6-9 Battery module 2 includes battery cells and BMS slave board; energy management module 5 includes MCU control board, communication chip, signal conditioning circuit and drive output circuit; inverter module 7 includes MPPT controller, DC / AC inverter unit and grid connection interface; fire protection module 9 includes main control board, solenoid valve, alarm 901, fire extinguishing agent 902 and sensor group 903.

[0023] Specifically, multiple battery modules 2 have their cells connected in parallel to form a battery. The battery data is sent and external commands are received through the BMS slave board. The MCU control board in the energy management module 5 is connected to the communication chip via the SPI bus to realize data acquisition and command issuance to the BMS slave board and inverter module 7. The signal conditioning circuit and drive output circuit receive sensor data and issue fire extinguishing and alarm commands. The inverter module 7 has a built-in bidirectional DC / AC module, MPPT photovoltaic controller and grid connection interface, which is suitable for installation in narrow spaces. Each battery module 2 is independently equipped with aerosol fire extinguishing agent 902. The cabinet 1 is equipped with temperature sensor, smoke sensor, audible and visual alarm 901 and explosion-proof valve to maximize the safety of energy storage power consumption. The main control board receives fire extinguishing commands and triggers the fire extinguishing agent 902 to extinguish the fire through the solenoid valve.

[0024] Reference Figure 2 , Figure 5 and Figure 6 Multiple battery modules 2 have their cells connected in parallel. The output of each cell is electrically connected to the BMS slave board. The rated capacity of battery module 2 is 17.92kWh and it supports hot-swapping. The output of battery module 2 is electrically connected to the input of high-voltage box 3. The BMS slave board is communicatively connected to energy management module 5.

[0025] Specifically, the 215kWh cabinet 1 consists of 12 standardized battery modules, each with a capacity of 217.92kWh, supporting hot-swappable replacement and capacity expansion. The battery cells of the battery module 2 are connected in parallel by nickel strip welding, and the output end is connected to the BMS circuit board. The BMS circuit board is connected to the RS485 communication interface of the energy management module 5 via a ribbon cable, transmitting data in real time to the MCU control board on the cell voltage accuracy of ±5mV, temperature gradient sampling period ≤200ms, and SOH value error of health status <3%. Based on this, the energy management module 5 dynamically optimizes the charge and discharge curves and activates the seamless capacity compensation algorithm under hot-swappable conditions. The positive and negative terminals of the output end of the battery module 2 are directly connected to the electrical input terminals of the high-voltage box 3 through a foolproof connector for power supply.

[0026] Reference Figure 2 , Figure 3 and Figure 8The MCU control board is connected to the communication chip. The output of the MCU control board is electrically connected to the signal conditioning circuit and the drive output circuit. The communication chip is connected to the BMS slave board, the display screen 6 and the inverter module 7 respectively. The MCU control board is electrically connected to the smoke sensor. The signal conditioning circuit is electrically connected to the output of the temperature sensor. The output of the drive output circuit is electrically connected to the alarm 901 and the solenoid valve respectively.

[0027] Specifically, the MCU control board is connected to the battery module 2 and inverter module 7 through a communication chip. It collects photovoltaic power, battery SOC, load demand and grid electricity price signals, monitors the DC bus voltage in real time and controls the multi-source energy distribution of photovoltaic, energy storage and grid. When the battery temperature or voltage is abnormal, it triggers the hierarchical protection mechanism and switches to the redundant power supply. It also displays the operating status and operating data of each system device on the human-machine interaction display screen 6. It receives data from the temperature sensor through the signal conditioning circuit and controls the alarm 901 and solenoid valve to perform alarm and fire extinguishing operations through the drive output circuit. The energy management module 5 includes a DC bus voltage adaptive function: dynamically adjusting the bus voltage range of 600V-876V according to photovoltaic input, battery SOC and load demand to optimize power transmission efficiency; it also includes a multi-source collaborative control function, with a priority strategy of: photovoltaic power supply → energy storage power supply → grid power supplement, and automatically switching charging and discharging modes in combination with time-of-use pricing.

[0028] Reference Figure 3 and Figure 7 The output of the high-voltage box 3 is directly connected to the inverter module 7 via a DC bus. The DC bus passes through the cable protection coil 11 installed in the cabinet to achieve a sealed connection. The MPPT controller is electrically connected to the DC / AC inverter unit via the DC bus. The output of the DC / AC inverter unit is electrically connected to the grid interface. The input of the MPPT controller is communicatively connected to the energy management module 5.

[0029] Specifically, the wall-mounted hybrid inverter module 7 is directly connected to the high-voltage box 3 inside the cabinet 1 via the DC bus and cable sheath 11, achieving sealed isolation of the electrical paths inside and outside the cabinet. The DC bus is directly connected to the DC input terminal of the inverter module 7, and the connection point is equipped with a voltage sampling circuit with an accuracy of ±0.5%. The MPPT controller is connected to the DC bus via a bidirectional DC / DC converter to achieve electrical connection and power coupling with the DC / AC inverter unit. The output terminal of the DC / AC inverter unit is directly connected to the grid connection interface via a copper busbar. At the interface, a grid-connected contactor with a rated breaking capacity of ≥10kA and a response time of ≤100ms is connected in series. The input terminal of the MPPT controller interacts with the energy management module 5 through the RS485 communication interface to transmit real-time voltage / current data of the photovoltaic array, and receives instructions from the energy management module 5 to perform operations such as target bus voltage setting and start / stop control.

[0030] Reference Figure 2 , Figure 3 and Figure 9 The sensor group 903 includes a temperature sensor and a smoke sensor. The output terminals of the temperature sensor and the smoke sensor are electrically connected to the main control board. The output terminals of the main control board are electrically connected to the alarm 901 and the solenoid valve, respectively. The solenoid valve is installed on the outer wall of the extinguishing agent 902. The extinguishing agent 902 is installed on the outer wall of the battery module 2. The input terminal of the main control board is communicatively connected to the energy management module 5.

[0031] Specifically, the temperature sensor is connected via a 4-20mA current loop and installed on the surface of battery module 2 to detect the surface temperature of battery module 2. The smoke sensor transmits signals via dry contacts to monitor the smoke concentration in the cabinet in real time. The main control board collects the analog signals from sensor group 903 and transmits them to the MCU control board in the energy management module 5. When the analog signals from sensor group 903 exceed the set threshold, the MCU control board sends a fire mode command to the main control board via communication connection. The main control board first controls the alarm 901 to issue an audible and visual alarm and drives the solenoid valve to trigger mechanical linkage so that the fire extinguishing agent 902 sprays the corresponding battery module 2 for targeted fire extinguishing. The fire extinguishing agent 902 is matched with multiple battery modules 2 in a one-to-one correspondence.

[0032] Reference Figure 1 , Figure 2 and Figure 3 The inner wall of the cabinet 1 is equipped with a power distribution unit 10, the top of the cabinet 1 is equipped with multiple lifting rings 12, the outer wall of the cabinet 1 is provided with multiple forklift transport ports 13, the cooling air conditioner 4 is located on the top of the cabinet 1, and the air duct of the cooling air conditioner 4 is connected to the battery module 2 area.

[0033] Specifically, the power distributor 10 serves as the system's power supply hub, receiving both the 1000VDC main power supply from the battery system and the 220VAC backup power supply from the mains via electrical connection. After passing through an isolation transformer and DC-DC conversion, it outputs 24VDC and 12VDC power to the other modules. When the main battery power supply fails, the power distributor 10 automatically switches to the backup power supply from the mains within 50ms to ensure the continuous operation of critical modules. The base of the cabinet 1 is equipped with a forklift transport port 13, and the top is equipped with a lifting ring 12 to facilitate the installation and transportation of the integrated cabinet. Meanwhile, the battery pack of the energy storage cabinet 1 is cooled by the air conditioning 4, and the inverter module 7 is cooled by natural air. The integrated collaborative temperature control algorithm reduces overall energy consumption.

[0034] Working principle: The entire energy storage system uses battery module 2 as the energy source, supplying 1000VDC direct current to inverter module 7. Energy management module 5 continuously acquires voltage, current, temperature, and state of charge (SOC) data of battery module 2, and sends real-time power dispatch commands to inverter module 7 based on grid load demand and battery health status. Under the control of energy management module 5, inverter module 7 converts DC power into 230VAC / 50Hz AC power, which is then fed into the grid through the grid connection interface unit. When the grid needs to charge the battery, the inverter switches to rectification mode, converting AC power back to DC power to charge battery module 2, forming a two-way energy flow closed loop. The power distributor 10 serves as the system power supply hub, simultaneously receiving the 21000VDC main power supply from the battery module and the 220VAC backup power supply from the mains. When the main power supply of the battery fails, the power distributor 10 automatically switches to the backup power supply from the mains to ensure the continuous operation of critical modules. The fire suppression module 9, as an additional safety module, operates in a silent monitoring state during normal system operation. Its sensor group 903 collects real-time temperature signals from the surface of the battery module 2 and smoke concentration signals from inside the cabinet. When the temperature sensor detects a temperature ≥65℃ for 5 seconds or a smoke concentration >5% obs / m, the fire suppression module 9 sends a Level 1 fire alarm warning to the energy management module 5, simultaneously activating the audible and visual alarm 901. If the fire is not extinguished within a preset time, the fire suppression module 9 triggers the aerosol extinguishing agent 902 above the corresponding battery compartment to spray extinguishing agent in a directional manner, ensuring the safety of energy storage power consumption.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter, comprising a cabinet (1), characterized in that: The inner wall of the cabinet (1) is equipped with multiple battery modules (2), a high voltage box (3), a heat dissipation air conditioner (4), an energy management module (5), a display screen (6) and a fire protection module (9). The outer wall of the cabinet (1) is fixedly connected with a mounting bracket (8), and an inverter module (7) is installed on the outer wall of the mounting bracket (8). The bottom of the cabinet (1) is equipped with a vibration damping component.

2. The integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter according to claim 1, characterized in that: The vibration damping component includes multiple counterweight balls (15), the outer wall of the counterweight balls (15) is slidably connected to the inner wall of the cabinet (1), and a sliding groove (14) is provided at the bottom end of the cabinet (1), the outer wall of the counterweight balls (15) is slidably connected to the inner wall of the sliding groove (14).

3. The integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter according to claim 1, characterized in that: The battery module (2) includes battery cells and a BMS slave board. The energy management module (5) includes an MCU control board, a communication chip, a signal conditioning circuit and a drive output circuit. The inverter module (7) includes an MPPT controller, a DC / AC inverter unit and a grid connection interface. The fire protection module (9) includes a main control board, a solenoid valve, an alarm (901), a fire extinguishing agent (902) and a sensor group (903).

4. The integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter according to claim 3, characterized in that: The cells of multiple battery modules (2) are connected in parallel. The output end of the cell is electrically connected to the BMS slave board. The rated capacity of the battery module (2) is 17.92kWh and supports hot-swapping. The output end of the battery module (2) is electrically connected to the input end of the high-voltage box (3). The BMS slave board is communicatively connected to the energy management module (5).

5. The integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter according to claim 3, characterized in that: The MCU control board is connected to the communication chip. The output of the MCU control board is electrically connected to the signal conditioning circuit. The output of the MCU control board is electrically connected to the drive output circuit. The communication chip is connected to the BMS slave board, the display screen (6) and the inverter module (7) respectively. The MCU control board is electrically connected to the smoke sensor. The signal conditioning circuit is electrically connected to the output of the temperature sensor. The output of the drive output circuit is electrically connected to the alarm (901) and the solenoid valve respectively.

6. The integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter according to claim 3, characterized in that: The output end of the high-voltage box (3) is directly connected to the inverter module (7) through the DC bus. The DC bus passes through the cable protection coil (11) installed in the cabinet to achieve a sealed connection. The MPPT controller is electrically connected to the DC / AC inverter unit through the DC bus. The output end of the DC / AC inverter unit is electrically connected to the grid interface. The input end of the MPPT controller is communicatively connected to the energy management module (5).

7. The integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter according to claim 3, characterized in that: The sensor group (903) includes a temperature sensor and a smoke sensor. The output terminals of the temperature sensor and the smoke sensor are electrically connected to the main control board. The output terminals of the main control board are electrically connected to the alarm (901) and the solenoid valve, respectively. The solenoid valve is installed on the outer wall of the extinguishing agent (902). The extinguishing agent (902) is installed on the outer wall of the battery module (2). The input terminal of the main control board is communicatively connected to the energy management module (5).

8. The integrated system of DC-side energy storage cabinet and wall-mounted hybrid inverter according to claim 1, characterized in that: The inner wall of the cabinet (1) is equipped with a power distribution unit (10), the top of the cabinet (1) is equipped with multiple lifting rings (12), the outer wall of the cabinet (1) is provided with multiple forklift transport ports (13), the heat dissipation air conditioner (4) is located on the top of the cabinet (1), and the air duct of the heat dissipation air conditioner (4) is connected to the battery module (2) area.

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