Container type flow battery energy storage device

Abstract

The utility model provides a container type flow battery energy storage device which comprises a box body which is internally provided with an anode storage tank, a cathode storage tank, at least one electric pile, an electrolyte circulating pipeline and an electrolyte circulating pump, the positive electrode and the negative electrode of the electric pile are respectively connected with the positive electrode storage tank and the negative electrode storage tank through corresponding electrolyte circulating pipelines and an electrolyte circulating pump; a BMS assembly and a PCS assembly which are connected with the galvanic pile are further arranged in the box body, the BMS assembly is used for monitoring and controlling the operation condition of the galvanic pile, and the PCS assembly is used for controlling the charging and discharging process of the galvanic pile. The positive electrode storage tank, the negative electrode storage tank, the electric pile, the circulating pipeline, the circulating pump, the BMS assembly and the PCS assembly are integrally installed in the box body, through the reasonable and compact internal layout, the system integration degree is improved, installation and civil construction of system peripheral equipment are reduced, the whole system main body frame is made of a standard container, and the whole system is convenient to use. Product standardization, transportation and hoisting are facilitated, and the project construction period is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid flow battery energy storage, in particular to a container-type liquid flow battery energy storage device. Background Art

[0002] All-vanadium liquid flow energy storage battery systems consist of power units, capacity units, electrolyte delivery systems, thermal management systems, and BMS (BMS components). Due to their high capacity, flexible capacity configuration, long cycle life, safety, and environmental friendliness, they are now widely used in wind-solar hybrid power generation, peak shaving and valley filling, smart microgrids, and emergency power supplies.

[0003] Most of the current large-scale liquid flow battery energy storage systems use fixed energy storage power stations, in which all units that make up the energy storage system are installed in a dedicated energy storage battery workshop. The disadvantages of fixed energy storage power stations are that the approval and construction procedures for the power stations are cumbersome, the construction costs are high, and the construction period is long. In addition, the construction of the power station must meet the requirements of the electrochemical energy storage design specifications for site selection, civil engineering, water supply and drainage, fire protection, and environmental protection. At the same time, the production process of liquid flow battery energy storage systems in the form of fixed energy storage power stations generally involves transporting components such as the stack, storage tanks, stack racks, and BMS to the site, and then installing the stack, storage tanks, pipelines, and bridges and laying cables on site. The on-site workload is large, the installation is time-consuming and labor-intensive, and the quality is difficult to control. Utility Model Content

[0004] The utility model proposes a containerized liquid flow battery energy storage device, which solves the problems of large on-site workload, time-consuming and labor-intensive installation, and difficult quality control in the existing fixed liquid flow energy storage power station.

[0005] The technical solution of the present utility model is achieved as follows:

[0006] The utility model provides a container-type liquid flow battery energy storage device, including a box body, wherein a positive electrode storage tank, a negative electrode storage tank, at least one battery stack, an electrolyte circulation pipeline and an electrolyte circulation pump are arranged in the box body, and the positive electrode and negative electrode of the battery stack are respectively connected to the positive electrode storage tank and the negative electrode storage tank through corresponding electrolyte circulation pipelines and electrolyte circulation pumps; a BMS component and a PCS component connected to the battery stack are also arranged in the box body, the BMS component is used to monitor and control the operating condition of the battery stack, and the PCS component is used to control the charging and discharging process of the battery stack.

[0007] The utility model integrates the positive electrode storage tank, negative electrode storage tank, battery stack, circulation pipe, circulation pump, BMS components, and PCS components in a box. Through a reasonable and compact internal layout, the system integration is improved, the installation of system peripheral equipment and civil construction are reduced, and the main frame of the entire system is made of standard containers, which facilitates product standardization, transportation and lifting, and shortens the project construction period.

[0008] Specifically, two groups of water-cooled heat dissipation systems are also provided in the box body, and the water-cooled heat dissipation system includes a chiller, a heat exchanger and a heat exchange circulation pump. The heat exchanger is provided with a tube-side inlet, a tube-side outlet, a shell-side inlet and a shell-side outlet, and the chiller is connected to the shell-side inlet and the shell-side outlet through a heat exchange medium circulation pipeline; the positive electrode storage tank or the negative electrode storage tank is connected to the tube-side inlet and the tube-side outlet of the corresponding heat exchanger through an electrolyte heat exchange pipeline, and the heat exchange circulation pump is installed on the electrolyte heat exchange pipeline; when it is necessary to cool the electrolyte in the storage tank, the electrolyte in the storage tank is pumped into the tube side of the heat exchanger through the heat exchange circulation pump to exchange heat with the low-temperature heat exchange medium in the shell side, and the electrolyte after heat exchange flows back to the storage tank through the circulation pipeline, thereby realizing the circulating heat dissipation of the electrolyte in the storage tank; the heat exchange medium after heat exchange flows back to the chiller through the circulation pipeline for cooling, thereby realizing the circulating supply of low-temperature heat exchange medium.

[0009] Furthermore, an ion concentration sensor is provided in the positive electrode storage tank and the negative electrode storage tank, and the ion concentration sensor is connected to the BMS component for monitoring the ion concentration in the positive electrode storage tank and the negative electrode storage tank; a three-way pipe joint is provided at the pipe outlet of the heat exchanger, one outlet of the three-way pipe joint is connected to the positive electrode storage tank or the negative electrode storage tank corresponding to the current heat exchanger through an electrolyte return pipe, and the other outlet of the three-way pipe joint is connected to the negative electrode storage tank or the positive electrode storage tank corresponding to another heat exchanger through a bypass pipe, a first solenoid valve is provided on the electrolyte return pipe, and a second solenoid valve is provided on the bypass pipe, the first solenoid valve and the second solenoid valve are respectively connected to the BMS component, and when the system is operating normally, the first solenoid valve is connected to the positive electrode storage tank or the negative electrode storage tank corresponding to the other heat exchanger through a bypass pipe. The first solenoid valve is opened, the second solenoid valve is closed, and the low-temperature heat exchange medium is input to the shell side of the heat exchanger through the chiller circulation. The electrolyte in the storage tank is pumped into the tube side of the heat exchanger by the heat exchange circulation pump to exchange heat with the low-temperature heat exchange medium in the shell side, so as to cool the electrolyte. The electrolyte after heat exchange flows back to the storage tank through the electrolyte return pipe to complete the circulation; when the ion concentration sensor detects that the ion valence of the electrolyte in the positive storage tank and the negative storage tank is unbalanced, the BMS component controls the first solenoid valve to close and the second solenoid valve to open, and the electrolyte in the positive storage tank / negative storage tank is pumped into the negative storage tank / positive storage tank through the bypass pipe by the heat exchange circulation pump, so that the electrolyte in the positive storage tank and the negative storage tank are mixed to balance the ion valence of the electrolyte.

[0010] Furthermore, temperature sensors are provided in the positive electrode storage tank and the negative electrode storage tank for monitoring the temperature of the electrolyte. The temperature sensors and the water cooling and heat dissipation system are connected to the BMS component. When it is monitored that the electrolyte temperature in the storage tank exceeds the set threshold, the BMS component controls the water cooling and heat dissipation system to operate and cool the electrolyte in the storage tank.

[0011] Specifically, an air temperature sensor and a cabinet air conditioner are provided in the box, and the air temperature sensor and the cabinet air conditioner are respectively connected to the BMS component. When the air temperature sensor detects that the air temperature in the box exceeds a preset threshold range, the BMS component controls the cabinet air conditioner to operate and adjust the temperature in the box.

[0012] Specifically, a leakage sensor, a tank pressure sensor, a pipeline pressure sensor, and a tank liquid level sensor are provided in the box body, and an alarm is provided on the outer wall of the box body. The leakage sensor, tank pressure sensor, pipeline pressure sensor, tank liquid level sensor, and alarm are respectively connected to the BMS components. The leakage sensor is used to monitor whether there is electrolyte leakage in the circulation pump, pipeline, battery stack, etc. in the box body, the tank pressure sensor is used to monitor whether the pressure in the tank is normal, the pipeline pressure sensor is used to monitor whether the pressure in each pipeline is normal, and the tank liquid level sensor is used to monitor whether the liquid level height in the tank is normal. When electrolyte leakage, abnormal tank pressure, abnormal pipeline pressure or abnormal tank liquid level is detected, the BMS component control system shuts down and controls the alarm to send an alarm signal.

[0013] Specifically, a gas concentration sensor is provided in the box body, a ventilation window is provided on the side wall of the box body, and an exhaust fan is installed on the window of the ventilation window. The gas concentration sensor and the exhaust fan are respectively connected to the BMS component. When the gas concentration sensor detects that the concentration of harmful gases in the box body exceeds the set threshold, the BMS component controls the exhaust fan to start and discharge the harmful gases in the box body, which can effectively prevent the accumulation of harmful gases in the container and cause the risk of accidents.

[0014] Specifically, the box body is a container, and the positive electrode storage tank and the negative electrode storage tank are square tank bodies. Compared with traditional cylindrical tank bodies, the tank capacity is increased, the electrolyte storage capacity is increased, and the internal space utilization of the container is improved.

[0015] Specifically, the inner wall of the box is provided with several fixing brackets for fixing the positive electrode storage tank, the negative electrode storage tank, the battery stack, the BMS assembly and the PCS assembly, so as to prevent damage caused by displacement and collision of the equipment in the box during transportation.

[0016] Specifically, the battery stack is located in the middle of the box, the positive electrode storage tank and the negative electrode storage tank are respectively located on both sides of the battery stack, the BMS component and the PCS component are located at one end of the box, and a partition is provided between the BMS component, the PCS component and the positive electrode storage tank or the negative electrode storage tank. The partition is used to isolate the BMS component and the PCS component from the tank, which can achieve complete isolation of electricity and liquid, greatly improving the safety of the electrical control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the internal layout structure of a container-type liquid flow battery energy storage device of the present invention;

[0019] Figure 2 This is a schematic diagram of the connection structure between the electrolyte circulation pipeline and the battery stack in an embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of the connection structure of the electrolyte heat exchange pipe, the heat exchange medium circulation pipe and the heat exchanger in the embodiment of the utility model;

[0021] Figure 4 This is a schematic diagram of the connection structure of the electrolyte circulation pipeline, the battery stack and the water cooling and heat dissipation system in the embodiment of the present utility model;

[0022] Figure 5 This is a schematic diagram of the medium flow direction of the storage tank, the fuel cell stack and the water cooling and heat dissipation system in the embodiment of the utility model;

[0023] Figure 6 This is a schematic diagram of the front structure of a container in an embodiment of the present utility model;

[0024] Figure 7 This is a schematic diagram of the back structure of a container in an embodiment of the present utility model;

[0025] Figure 8 This is a schematic diagram of the layout structure of the fixed bracket inside the container in the embodiment of the utility model;

[0026] In the figure: 1. Box body; 2. Positive electrode storage tank; 3. Negative electrode storage tank; 4. Fuel cell; 5. Electrolyte circulation pipeline; 6. Electrolyte circulation pump; 7. BMS assembly; 8. PCS assembly; 9. Heat exchanger; 10. Heat exchange circulation pump; 11. Heat exchange medium circulation pipeline; 12. Electrolyte heat exchange pipeline; 13. Three-way pipe joint; 14. Electrolyte return pipeline; 15. Bypass pipeline; 16. First solenoid valve; 17. Second solenoid valve; 18. Cabinet air conditioner; 19. Ventilation window; 20. Fixed bracket; 21. Partition. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solution of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Reference Figures 1 to 8 An embodiment of the utility model provides a container-type liquid flow battery energy storage device, including a box body 1, in which a positive electrode storage tank 2, a negative electrode storage tank 3, at least one battery stack 4 (in this embodiment, two battery stacks 4 are taken as an example. During the specific implementation, the number of battery stacks 4 can be flexibly adjusted according to actual conditions), an electrolyte circulation pipe 5 and an electrolyte circulation pump 6 are arranged. The positive electrode and negative electrode of the battery stack 4 are respectively connected to the positive electrode storage tank 2 and the negative electrode storage tank 3 through the corresponding electrolyte circulation pipe 5 and the electrolyte circulation pump 6; the box body 1 is also provided with a BMS component 7 (battery management system) and a PCS component 8 (energy storage converter) connected to the battery stack 4. The BMS component 7 is used to monitor and control the operating conditions of the battery stack 4, and the PCS component 8 is used to control the charging and discharging process of the battery stack 4.

[0029] The utility model integrates the positive electrode storage tank 2, the negative electrode storage tank 3, the battery stack 4, the circulation pipe, the circulation pump, the BMS component 7, and the PCS component 8 in the box body 1. Through the reasonable and compact internal layout, the system integration is improved, the installation of the system peripheral equipment and the civil construction are reduced, and the main frame of the entire system is made of standard containers, which facilitates product standardization, transportation and lifting, and shortens the project construction period.

[0030] In the specific implementation process, Figure 2 As shown, the liquid outlet of the positive electrode storage tank 2 is connected to the electrolyte circulation pump 6, and the outlet pipe of the electrolyte circulation pump 6 is divided into two groups of branch pipes, which are respectively connected to the positive electrode liquid inlets of the two battery stacks 4. The positive electrode liquid outlets of the two battery stacks 4 are merged into an inlet pipe through the two groups of branch pipes and then connected to the return liquid port of the positive electrode storage tank 2; the electrolyte circulation pipeline of the negative electrode storage tank 3 and the two battery stacks 4 is the same as that of the positive electrode storage tank 2.

[0031] Specifically, if Figures 3 to 5As shown, the box body 1 is further provided with two water cooling and heat dissipation systems, which are used to independently dissipate heat for the electrolyte in the positive electrode storage tank 2 and the negative electrode storage tank 3, respectively. The water cooling and heat dissipation system includes a chiller (not shown in the figure), a heat exchanger 9 and a heat exchange circulation pump 10. The heat exchanger 9 is provided with a tube side inlet, a tube side outlet, a shell side inlet and a shell side outlet. The chiller is connected to the shell side inlet and the shell side outlet through a heat exchange medium circulation pipe 11; the positive electrode storage tank 2 or the negative electrode storage tank 3 is connected to the tube side inlet of the corresponding heat exchanger 9. , the tube side outlet is connected through the electrolyte heat exchange pipe 12, and the heat exchange circulation pump 10 is installed on the electrolyte heat exchange pipe 12; when the electrolyte in the storage tank needs to be cooled, the electrolyte in the storage tank is pumped into the tube side of the heat exchanger 9 through the heat exchange circulation pump 10 to exchange heat with the low-temperature heat exchange medium in the shell side, and the electrolyte after heat exchange is returned to the storage tank through the circulation pipe, thereby realizing the circulating heat dissipation of the electrolyte in the storage tank; the heat exchange medium after heat exchange is returned to the chiller through the circulation pipe for cooling, thereby realizing the circulating supply of low-temperature heat exchange medium.

[0032] In the specific implementation process, Figure 3 As shown, the tube-side inlet and the tube-side outlet are respectively located at the bottom and the top of the heat exchanger 9, and the shell-side inlet and the shell-side outlet are respectively located at the top and the bottom of the side wall of the heat exchanger 9. The heat exchanger 9 can adopt a shell-and-tube heat exchanger 9.

[0033] In the specific implementation process, Figure 3 As shown, two water-cooled heat dissipation systems can share one chiller. The outlet pipe of the chiller is divided into two branches, which are respectively connected to the shell-side inlets of the two heat exchangers 9. The return pipe of the chiller is divided into two branches, which are respectively connected to the shell-side outlets of the two heat exchangers 9.

[0034] Furthermore, if Figures 3 to 5As shown, the positive electrode storage tank 2 and the negative electrode storage tank 3 are provided with ion concentration sensors, which are connected to the BMS component 7 to monitor the ion concentrations in the positive electrode storage tank 2 and the negative electrode storage tank 3; the pipe outlet of the heat exchanger 9 is provided with a three-way pipe joint 13, one outlet of the three-way pipe joint 13 is connected to the positive electrode storage tank 2 or the negative electrode storage tank 3 corresponding to the current heat exchanger 9 through an electrolyte return pipe 14, and the other outlet of the three-way pipe joint 13 is connected to the negative electrode storage tank 3 or the positive electrode storage tank 2 corresponding to another heat exchanger 9 through a bypass pipe 15, and the electrolyte return pipe 14 is provided with a first solenoid valve 16, and the bypass pipe 15 is provided with a second solenoid valve 17 (both the first solenoid valve 16 and the second solenoid valve 17 can be ball valves), and the first solenoid valve 16 and the second solenoid valve 17 are respectively connected to the BMS component 7 When the system is operating normally, the first solenoid valve 16 is opened and the second solenoid valve 17 is closed. The low-temperature heat exchange medium is input to the shell side of the heat exchanger 9 through the chiller circulation. The electrolyte in the storage tank is pumped into the tube side of the heat exchanger 9 by the heat exchange circulation pump 10 to exchange heat with the low-temperature heat exchange medium in the shell side, thereby cooling the electrolyte. The electrolyte after heat exchange is returned to the storage tank through the electrolyte return pipe 14 to complete the circulation; when the ion concentration sensor detects that the ion valence of the electrolyte in the positive electrode storage tank 2 and the negative electrode storage tank 3 is unbalanced, the BMS component 7 controls the first solenoid valve 16 to be closed and the second solenoid valve 17 to be opened, and the electrolyte in the positive electrode storage tank 2 / negative electrode storage tank 3 is pumped into the negative electrode storage tank 3 / positive electrode storage tank 2 through the bypass pipe by the heat exchange circulation pump 10, so that the electrolyte in the positive electrode storage tank 2 and the negative electrode storage tank 3 are mixed to balance the ion valence of the electrolyte.

[0035] Furthermore, temperature sensors are provided in the positive electrode storage tank 2 and the negative electrode storage tank 3 for monitoring the temperature of the electrolyte. The temperature sensors and the water cooling and heat dissipation system are connected to the BMS component 7. When the electrolyte temperature in the storage tank is detected to exceed a set threshold (the set threshold is 38°C in this embodiment), the BMS component 7 controls the water cooling and heat dissipation system to cool the electrolyte in the storage tank.

[0036] Specifically, if Figure 6 As shown, an air temperature sensor and a cabinet air conditioner 18 are provided in the box 1. The air temperature sensor and the cabinet air conditioner 18 are respectively connected to the BMS component 7. When the air temperature sensor detects that the air temperature in the box 1 exceeds a preset threshold range, the BMS component 7 controls the cabinet air conditioner 18 to operate and adjust the temperature in the box 1.

[0037] During the specific implementation process, the installation space of the electrical control unit (including the BMS component 7 and the PCS component 8) and the installation space of the battery stack 4 in the box body 1 are respectively installed with independent cabinet air conditioners 18 and independent air temperature sensors, which can independently control the temperature of the installation space of the electrical control unit and the installation space of the battery stack 4.

[0038] Specifically, a leakage sensor, a tank pressure sensor, a pipeline pressure sensor, and a tank liquid level sensor are provided in the box body 1, and an alarm is provided on the outer wall of the box body 1. The leakage sensor, tank pressure sensor, pipeline pressure sensor, tank liquid level sensor, and alarm are respectively connected to the BMS component 7. The leakage sensor is used to monitor whether there is electrolyte leakage in the circulation pump, pipeline, battery stack 4, etc. in the box body 1. The tank pressure sensor is used to monitor whether the pressure in the tank is normal. The pipeline pressure sensor is used to monitor whether the pressure in each pipeline is normal. The tank liquid level sensor is used to monitor whether the liquid level height in the tank is normal. When electrolyte leakage, abnormal tank pressure, abnormal pipeline pressure or abnormal tank liquid level is detected, the BMS component 7 controls the system to shut down (automatically shutting down the circulation pump and the electric control valve on the pipeline) and controls the alarm to send an alarm signal.

[0039] During the specific implementation process, leakage sensors are installed under the circulation pump, pipe joints, and battery stack 4 to monitor whether electrolyte leakage occurs. At the same time, a smoke alarm is installed on the top of the box 1. When electrolyte leakage or smoke is detected, the system will immediately shut down, close the corresponding valve and alarm.

[0040] During the specific implementation process, the electrolyte circulation pipeline 5 is installed with an electric valve, a butterfly valve, a drain ball valve, a shock absorber joint, a temperature sensor and a pressure sensor. By installing the electric valve, the butterfly valve and the drain ball valve on the electrolyte circulation pipeline 5, the system's early installation and commissioning and later inspection and maintenance are convenient; the temperature sensor is used to monitor the temperature of the electrolyte, and the pressure sensor is used to monitor the pipeline pressure data.

[0041] Specifically, if Figure 7 As shown, a gas concentration sensor is provided in the box body 1, and a ventilation window 19 is provided on the side wall of the box body 1. An exhaust fan is installed on the window of the ventilation window 19. The gas concentration sensor and the exhaust fan are respectively connected to the BMS component 7. When the gas concentration sensor detects that the concentration of harmful gases in the box body 1 exceeds the set threshold, the BMS component 7 controls the exhaust fan to start and discharge the harmful gases in the box body 1, which can effectively prevent the accumulation of harmful gases in the container and cause accidents.

[0042] During the specific implementation process, a hydrogen alarm is installed inside the box 1, and the breathing valve pipe outlet of the storage tank is led to the outside of the box 1, so that the harmful gas in the storage tank can be discharged; if the breathing valve pipe of the storage tank fails and the harmful gas is not discharged in time, when the gas concentration sensor detects that the concentration of the harmful gas reaches the warning value, the BMS component 7 will automatically control the exhaust fan to start and discharge the harmful gas from the box 1.

[0043] Specifically, the box body 1 is a container, and the positive electrode storage tank 2 and the negative electrode storage tank 3 are square tank bodies (welded by PPH). Compared with traditional cylindrical tank bodies, the tank capacity is increased, the electrolyte storage capacity is increased, and the utilization rate of the internal space of the container is improved.

[0044] During the specific implementation process, a thermal insulation layer is installed on the outer wall of the container to ensure that the electrical control unit does not overheat and the electrolyte is at the optimal working temperature, thereby improving the system's adaptability to the climate environment.

[0045] During the specific implementation process, the front, back and both ends of the container are equipped with double-opening inspection doors to facilitate the loading of early equipment and subsequent inspection and maintenance.

[0046] Specifically, if Figure 8 As shown, the inner wall of the box body 1 is provided with a plurality of fixing brackets 20 for fixing the positive electrode storage tank 2, the negative electrode storage tank 3, the battery stack 4, the BMS component 7 and the PCS component 8, so as to prevent the equipment in the box body 1 from being damaged by displacement and collision during transportation.

[0047] Specifically, the battery stack 4 is located in the middle of the box 1, the positive electrode storage tank 2 and the negative electrode storage tank 3 are respectively located on both sides of the battery stack 4, the BMS component 7 and the PCS component 8 are located at one end of the box 1, and a partition 21 is provided between the BMS component 7, the PCS component 8 and the positive electrode storage tank 2 or the negative electrode storage tank 3. The partition 21 isolates the BMS component 7 and the PCS component 8 from the tank, which can achieve complete electrical and liquid isolation, greatly improving the safety of the electrical control system.

[0048] To simplify on-site installation, the stack 4, circulating pump, piping, and water-cooling system can be mounted on a bracket in the workshop to form the power unit assembly. The entire power unit assembly can then be installed in the container. This effectively improves the convenience of system installation and facilitates mass production. After the power unit assembly is in place, the positive electrode storage tank 2 and the negative electrode storage tank 3 are fork-mounted through the door openings at both ends of the container and installed. The electrical compartment partition 21 is then installed to isolate the tanks from the electrical control unit. Finally, the BMS assembly 7 and PCS assembly 8 are installed.

[0049] This utility model provides a solution for the standardized, large-scale production, integrated control, and convenient installation and maintenance of liquid flow battery energy storage systems, improving system installation efficiency and reducing installation and transportation costs. Through a rational and compact internal layout, the system's integration is improved, and the installation of peripheral equipment and civil engineering construction are reduced. An independent thermal management system allows the system to operate within a suitable temperature range and reduces peripheral losses. Internally installed leakage sensors provide timely shutdown protection in the event of a leak. Furthermore, a number of valves, sensors, and electric valves are provided to enable online monitoring, abnormality alarms, and abnormality shutdown protection, improving system reliability.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A containerized liquid flow battery energy storage device, characterized in that: The invention comprises a box (1), wherein a positive electrode storage tank (2), a negative electrode storage tank (3), at least one battery stack (4), an electrolyte circulation pipeline (5) and an electrolyte circulation pump (6) are arranged in the box (1), and the positive electrode and the negative electrode of the battery stack (4) are respectively connected to the positive electrode storage tank (2) and the negative electrode storage tank (3) through the corresponding electrolyte circulation pipeline (5) and the electrolyte circulation pump (6); the box (1) is also provided with a BMS component (7) and a PCS component (8) connected to the battery stack (4), wherein the BMS component (7) is used to monitor and control the operating conditions of the battery stack (4), and the PCS component (8) is used to control the charging and discharging process of the battery stack (4).

2. A containerized liquid flow battery energy storage device according to claim 1, characterized in that: Two groups of water-cooling and heat dissipation systems are also provided in the box (1), and the water-cooling and heat dissipation systems include a chiller, a heat exchanger (9) and a heat exchange circulation pump (10). The heat exchanger (9) is provided with a tube-side inlet, a tube-side outlet, a shell-side inlet and a shell-side outlet. The chiller is connected to the shell-side inlet and the shell-side outlet via a heat exchange medium circulation pipeline (11); the positive electrode storage tank (2) or the negative electrode storage tank (3) is connected to the tube-side inlet and the tube-side outlet of the corresponding heat exchanger (9) via an electrolyte heat exchange pipeline (12), and the heat exchange circulation pump (10) is installed on the electrolyte heat exchange pipeline (12).

3. A containerized liquid flow battery energy storage device according to claim 2, characterized in that: Ion concentration sensors are provided in the positive electrode storage tank (2) and the negative electrode storage tank (3), and the ion concentration sensors are connected to the BMS component (7) for monitoring the ion concentration in the positive electrode storage tank (2) and the negative electrode storage tank (3); a three-way pipe joint (13) is provided at the pipe outlet of the heat exchanger (9), one outlet of the three-way pipe joint (13) is connected to the positive electrode storage tank (2) or the negative electrode storage tank (3) corresponding to the current heat exchanger (9) through an electrolyte return pipe (14), and the other outlet of the three-way pipe joint (13) is connected to the negative electrode storage tank (3) or the positive electrode storage tank (2) corresponding to another heat exchanger (9) through a bypass pipe (15), a first solenoid valve (16) is provided on the electrolyte return pipe (14), and a second solenoid valve (17) is provided on the bypass pipe (15), and the first solenoid valve (16) and the second solenoid valve (17) are respectively connected to the BMS component (7).

4. A containerized liquid flow battery energy storage device according to claim 2, characterized in that: Temperature sensors are provided in the positive electrode storage tank (2) and the negative electrode storage tank (3) for monitoring the temperature of the electrolyte. The temperature sensors, the water cooling system and the BMS component (7) are connected.

5. The containerized liquid flow battery energy storage device according to claim 1, characterized in that: An air temperature sensor and a cabinet air conditioner (18) are provided in the box (1), and the air temperature sensor and the cabinet air conditioner (18) are respectively connected to the BMS component (7).

6. A containerized liquid flow battery energy storage device according to claim 1, characterized in that: A liquid leakage sensor, a storage tank pressure sensor, a pipeline pressure sensor, and a storage tank liquid level sensor are provided in the box (1), and an alarm is provided on the outer wall of the box (1). The liquid leakage sensor, the storage tank pressure sensor, the pipeline pressure sensor, the storage tank liquid level sensor, and the alarm are respectively connected to the BMS component (7).

7. The containerized liquid flow battery energy storage device according to claim 1, characterized in that: A gas concentration sensor is provided in the box (1), a ventilation window (19) is provided on the side wall of the box (1), an exhaust fan is installed on the window of the ventilation window (19), and the gas concentration sensor and the exhaust fan are respectively connected to the BMS component (7).

8. The containerized liquid flow battery energy storage device according to claim 1, characterized in that: The box body (1) is a container, and the positive electrode storage tank (2) and the negative electrode storage tank (3) are square tank bodies.

9. The containerized liquid flow battery energy storage device according to claim 1, characterized in that: The inner wall of the box (1) is provided with a plurality of fixing brackets (20) for fixing the positive electrode storage tank (2), the negative electrode storage tank (3), the battery stack (4), the BMS component (7) and the PCS component (8).

10. The containerized liquid flow battery energy storage device according to claim 1, characterized in that: The battery stack (4) is located in the middle of the box (1), the positive electrode storage tank (2) and the negative electrode storage tank (3) are respectively located on both sides of the battery stack (4), the BMS component (7) and the PCS component (8) are located at one end of the box (1), and a partition (21) is provided between the BMS component (7), the PCS component (8) and the positive electrode storage tank (2) or the negative electrode storage tank (3).

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