Flow battery system and liquid path early warning method thereof

Abstract

The invention relates to the technical field of flow batteries, and discloses a flow battery system and a liquid path early warning method thereof, and the liquid path early warning method comprises the following steps: S1, a flow monitoring device monitors the flow velocity and flow of an electrolyte in real time, and a pressure monitoring device monitors the flow pressure of the electrolyte in a pipeline in real time, and transmits data to the system; s2, the system judges whether the flow of the electrolyte flowing into the galvanic pile is uniform or not by combining the two data; s3, if the flow of the electrolyte is uniform, the flow battery system operates normally, and if the flow of the electrolyte is not uniform, the flow battery system automatically increases or reduces the flow velocity of the electrolyte in the pipeline through an electrolyte flow velocity adjusting device so as to realize the uniformity of the flow velocity; whether liquid leakage occurs or not and whether the liquid level is uniform or not can be monitored and adjusted in real time, and the safety of the flow battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flow batteries, and particularly to a flow battery system and a liquid path warning method thereof. Background Art

[0002] Flow batteries have advantages such as high safety, long cycle life, recyclable electrolyte, high cost performance in the life cycle, and environmental friendliness. They are considered one of the preferred technologies for large-scale flow battery technology and have broad application prospects. Among them, comprehensively measured by indicators such as energy density, efficiency, scale, cycle life, and cost, the best technology to match the new generation of power grids is the flow battery technology in electrochemical flow batteries. Its energy storage density reaches 10 - 30 Wh / kg, and the efficiency is between 60% - 85%. Moreover, the power and capacity can be designed independently, the charge and discharge reactions are rapid, and the applicable range is wide. It can not only be used for peak shaving and valley filling, but also as a backup power source or emergency power supply, and can also be used to improve the quality of electric power, voltage regulation, and frequency modulation, etc.

[0003] In the energy unit (electrolyte), the concentration of the active substance that can participate in the electrochemical reaction determines the upper limit of the energy density of the battery system. That is to say, the maximum energy that the battery system can store and provide is directly related to the content of its active substance, and the stability of the electrolyte flow rate through the stack plays a decisive role in the efficiency of the battery. Therefore, the stability of the electrolyte flow rate delivery determines the charge and discharge efficiency and reliability of the battery. And if the pressures of the electrolyte flowing into the stack in the positive and negative electrode pipelines are inconsistent, it will cause a pressure difference on both sides of the diaphragm during the electrochemical reaction process inside the stack, squeezing the positive or negative electrode liquid with a higher pressure into the other liquid, causing a short circuit inside the stack, resulting in abnormal stack temperature rise and a significant reduction in charge and discharge efficiency. Summary of the Invention

[0004] (I) Technical Problems to be Solved Aiming at the deficiencies of the prior art, the present invention provides a flow battery system and a liquid path warning method thereof, which have the advantages of being able to automatically give warnings and improving the stability of the electrolyte flow rate through the stack, and solve the problem that if the pressures of the electrolyte flowing into the stack in the positive and negative electrode pipelines are inconsistent, it will cause a pressure difference on both sides of the diaphragm during the electrochemical reaction process inside the stack, squeezing the positive or negative electrode liquid with a higher pressure into the other liquid, causing a short circuit inside the stack, resulting in abnormal stack temperature rise and a significant reduction in charge and discharge efficiency.

[0005] (II) Technical Solutions To achieve the purpose of making the pressure of the electrolyte flowing into the positive and negative electrode pipelines of the stack consistent, ensuring that there is no pressure difference on both sides of the diaphragm during the electrochemical reaction process inside the stack, avoiding problems such as short circuits and abnormal temperature rise inside the stack, and improving the charge and discharge efficiency, the present invention provides the following technical solutions: A flow battery system and its liquid path early warning method. The flow battery system includes a stack chamber and a liquid tank. A number of stacks and harmful gas monitoring devices are arranged inside the stack chamber. A voltage and current detection device, an automatic charge and discharge device, and a stack liquid leakage monitoring device for real-time monitoring of whether liquid leakage occurs inside the stack chamber and giving an early warning are connected to the stack. The stack is connected to the liquid tank through a pipeline. An electrolyte flow rate adjustment device, a flow rate monitoring device for real-time monitoring of the electrolyte flow rate in the pipeline, a pressure detection device, and a pipeline valve automatic opening and closing device are successively installed on the connection pipeline between the stack and the liquid tank. A liquid level detection device for real-time monitoring of the liquid level height inside the liquid tank and a liquid tank liquid leakage monitoring device for real-time monitoring of whether liquid leakage occurs in the liquid tank and capable of giving an early warning are installed on the liquid tank; The liquid path early warning method includes the following steps: Step S1: The flow rate monitoring device real-time monitors the electrolyte flow rate and flow rate, and the pressure monitoring device real-time monitors the flow pressure of the electrolyte in the pipeline, and transmits the data to the system; Step S2: The system combines the two data to judge whether the electrolyte flow rate flowing into the stack is uniform; Step S3: If the electrolyte flow rate is uniform, the flow battery system operates normally. If the electrolyte flow rate is not uniform, the flow battery system automatically increases or decreases the electrolyte flow rate in the pipeline through the electrolyte flow rate adjustment device to achieve flow rate uniformity.

[0006] Preferably, the liquid path early warning method further includes the following steps: Step 1: The liquid level detection device real-time monitors the liquid level value inside the liquid tank, observes whether the positive and negative electrode electrolyte liquid levels in the liquid tank are uniform. If the electrolyte liquid levels are uniform, the flow battery system operates normally. If the electrolyte liquid levels are not uniform, the liquid level monitoring device issues an alarm and enters Step 2; Step 2: The liquid level detection device transmits the value to the system, and the system automatically adjusts the electrolyte flow rate adjustment device of the pipeline to which the liquid tank with a higher liquid level belongs, increases the electrolyte flow rate in this pipeline, so that the liquid level of the liquid tank drops to make the positive and negative liquid levels uniform, and enters Step 1.

[0007] Preferably, the liquid path early warning method further includes the following steps: Step SS1: The stack liquid leakage monitoring device real-time monitors whether the stack leaks liquid, and the liquid tank liquid leakage monitoring device real-time monitors whether the liquid tank leaks liquid. If no liquid leakage occurs, the flow battery system operates normally. If liquid leakage occurs, it enters Step SS2; Step SS2: The leakage monitoring device that detects leakage issues issues an alarm and transmits it to the system, then proceeds to Step SS3; Step SS3: The system controls the automatic charge and discharge device to stop the charge and discharge process, and rapidly reduces the pump speed step by step through the electrolyte flow rate adjustment device until the electrolyte delivery stops. Meanwhile, the pipeline valve automatic opening and closing device automatically closes the valve, then proceeds to Step SS4; Step SS4: Replace the stack or liquid tank where leakage occurred, then proceed to Step SS1.

[0008] Preferably, the harmful gas monitoring device is installed inside the stack compartment of the flow battery system, used to monitor the harmful gases in the air inside the stack compartment in real time. When the harmful gas value reaches the preset value, it can issue a warning.

[0009] Preferably, the automatic charge and discharge device is connected to the stack of the flow battery system, used to automatically adjust the charge and discharge current and voltage.

[0010] Preferably, the electrolyte flow rate adjustment device: is installed between the liquid tank and the stack pipeline of the flow battery system, used to adjust the electrolyte flow rate inside the pipeline.

[0011] Preferably, the flow rate monitoring device is installed between the liquid tank and the stack pipeline of the flow battery system, used to monitor the electrolyte flow rate inside the pipeline in real time.

[0012] Preferably, the pressure detection device is installed between the liquid tank and the stack pipeline of the flow battery system, used to monitor the pressure inside the pipeline in real time.

[0013] Preferably, the pipeline valve automatic opening and closing device is installed at the liquid inlet and outlet of the liquid tank of the flow battery system, used for remote operation to open and close.

[0014] Preferably, an exhaust device for drying and filtering the hydrogen gas precipitated inside the liquid tank and a hydrogen gas metering device for real-time monitoring of the hydrogen evolution situation inside the liquid tank are also installed on the liquid tank.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a flow battery system and its liquid path warning method, which have the following beneficial effects: 1. For this flow battery system and its liquid path warning method, through the present invention, a flow rate monitoring device is provided on the pipeline to monitor the electrolyte flow rate and flow volume inside the positive and negative pipelines in real time; a pressure monitoring device monitors the liquid flow pressure inside the positive and negative pipelines in real time. After the device feeds back the data to the system, the system will combine the two data to judge whether the electrolyte flow volume flowing into the stack is uniform. When the flow volume of one side of the positive or negative electrolyte pipeline is abnormal (the flow rate / flow volume is inconsistent or the pressure is too high / low), the system will automatically increase or decrease the electrolyte flow rate inside this pipeline through the electrolyte flow rate adjustment device to achieve flow rate uniformity.

[0016] 2. The flow battery system and its liquid path warning method are provided with liquid level monitoring devices arranged in the positive and negative liquid tanks. The devices monitor the liquid level values in the liquid tanks in real time. When it is found that the electrolyte liquid levels in the positive and negative liquid tanks are uneven, the devices will submit the values to the system. The system will automatically adjust the electrolyte flow rate adjustment device of the pipeline belonging to the liquid tank with a higher liquid level, increase the electrolyte flow rate of this pipeline, accelerate the electrolyte flow to lower the liquid level of the liquid tank. When the liquid levels of the positive and negative liquid tanks are basically adjusted evenly, the system will restore the electrode liquid flow rate to the value before adjustment through the electrolyte flow rate adjustment device; further improving the safety of the flow battery system, thereby extending the service life of the flow battery.

[0017] 3. The flow battery system and its liquid path warning method are provided with leakage monitoring devices arranged in both the positive and negative liquid tanks and the stack chamber, which detect whether leakage occurs in real time. If leakage is detected, an alarm will be issued and uploaded to the system. The automatic charge and discharge device will stop charging and discharging, and the pump speed will be quickly reduced step by step through the electrolyte flow rate adjustment device until the electrolyte delivery stops. The pipeline valve automatic opening and closing device will automatically close the valve to prevent the leakage situation from deteriorating further, thereby ensuring the safety of the flow battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the structural framework diagram of the flow battery system of the present invention; Figure 2 is the block diagram of the warning steps of the flow rate monitoring device and the pressure monitoring device of the present invention; Figure 3 is the block diagram of the warning steps of the liquid level detection device of the present invention; Figure 4 is the block diagram of the warning steps of the leakage monitoring device of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Such as Figure 1 and Figure 2As shown in the figure, a flow battery system and a liquid path early warning method thereof. The flow battery system includes a stack bin and a liquid tank. Inside the stack bin, there are several stacks and a harmful gas monitoring device. A voltage and current detection device, an automatic charge and discharge device, and a stack liquid leakage monitoring device for real-time monitoring of whether liquid leakage occurs in the stack bin and giving an early warning are connected to the stack. The stack is connected to the liquid tank through a pipeline. An electrolyte flow rate adjustment device, a flow rate monitoring device for real-time monitoring of the electrolyte flow rate in the pipeline, a pressure detection device, and a pipeline valve automatic opening and closing device are successively installed on the connecting pipeline between the stack and the liquid tank. A liquid level detection device for real-time monitoring of the liquid level height in the liquid tank and a liquid tank liquid leakage monitoring device for real-time monitoring of whether the liquid tank leaks and capable of giving an early warning are installed on the liquid tank; The liquid path early warning method includes the following steps: Step S1: The flow rate monitoring device monitors the electrolyte flow rate and flow rate in real time, and the pressure monitoring device monitors the flow pressure of the electrolyte in the pipeline in real time, and transmits the data to the system; Step S2: The system combines the two data to judge whether the electrolyte flow rate flowing into the stack is uniform; Step S3: If the electrolyte flow rate is uniform, the flow battery system operates normally. If the electrolyte flow rate is not uniform, the flow battery system automatically increases or decreases the electrolyte flow rate in the pipeline through the electrolyte flow rate adjustment device to achieve flow rate uniformity.

[0021] In the present invention, a flow rate monitoring device is provided on the pipeline to monitor the electrolyte flow rate and flow rate in the positive and negative electrode pipelines in real time; the pressure monitoring device monitors the liquid flow pressure in the positive and negative electrode pipelines in real time. After the device feeds back the data to the system, the system will combine the two data to judge whether the electrolyte flow rate flowing into the stack is uniform. When the flow rate on one side of the positive or negative electrode electrolyte pipeline is abnormal (the flow rate / flow rate is inconsistent or the pressure is too high / low), the system will automatically increase or decrease the electrolyte flow rate in the pipeline through the electrolyte flow rate adjustment device to achieve flow rate uniformity.

[0022] As Figure 3 shown in the figure, in this embodiment, the liquid path early warning method further includes the following steps: Step 1: The liquid level detection device monitors the liquid level value in the liquid tank in real time, and observes whether the positive and negative electrode electrolyte liquid levels in the liquid tank are uniform. If the electrolyte liquid levels are uniform, the flow battery system operates normally. If the electrolyte liquid levels are not uniform, the liquid level monitoring device issues an alarm and enters Step 2; Step 2: The liquid level detection device transmits the value to the system, and the system automatically adjusts the electrolyte flow rate adjustment device of the pipeline to which the liquid tank with a higher liquid level belongs, increases the electrolyte flow rate in the pipeline, so that the liquid level of the liquid tank drops to make the positive and negative electrode liquid levels uniform, and enters Step 1.

[0023] The positive and negative liquid tanks of the present invention are provided with liquid level monitoring devices, which monitor the liquid level values in the liquid tanks in real time. When it is found that the electrolyte liquid levels in the positive and negative liquid tanks are uneven, the device will transmit the values to the system, and the system will automatically adjust the electrolyte flow rate adjustment device of the pipeline to which the liquid tank with the higher liquid level belongs, increase the electrolyte flow rate of this pipeline, and accelerate the electrolyte flow to make the liquid level of the liquid tank drop. When the liquid levels of the positive and negative liquid tanks are basically adjusted evenly, the system will restore the electrolyte flow rate to the value before adjustment through the electrolyte flow rate adjustment device.

[0024] As Figure 4 shown, in this embodiment, the liquid path early warning method further includes the following steps: Step SS1: The stack leakage monitoring device monitors in real time whether the stack leaks, and the liquid tank leakage monitoring device monitors in real time whether the liquid tank leaks. If there is no leakage, the flow battery system operates normally. If there is leakage, go to step SS2; Step SS2: The leakage monitoring device that detects leakage issues an alarm and transmits it to the system, and enter step SS3; Step SS3: The system controls the automatic charge and discharge device to stop charging and discharging, and rapidly reduces the pump speed step by step through the electrolyte flow rate adjustment device until the electrolyte delivery stops. At the same time, the pipeline valve automatic opening and closing device automatically closes the valve, and enter step SS4; Step SS4: Replace the stack or liquid tank that has leaked, and enter step SS1.

[0025] Leakage monitoring devices are arranged in both the positive and negative liquid tanks and the stack compartment of the present invention to detect whether leakage occurs in real time. If leakage is detected, an alarm is issued and uploaded to the system. The automatic charge and discharge device stops charging and discharging, and rapidly reduces the pump speed step by step through the electrolyte flow rate adjustment device until the electrolyte delivery stops. The pipeline valve automatic opening and closing device automatically closes the valve to prevent the leakage situation from deteriorating further.

[0026] In this embodiment, the harmful gas monitoring device is installed in the stack compartment of the flow battery system to monitor the harmful gases in the air in the stack compartment in real time. When the harmful gas value reaches the preset value, a warning can be issued.

[0027] In this embodiment, the automatic charge and discharge device is connected to the stack of the flow battery system and is used to automatically adjust the charge and discharge current and voltage.

[0028] In this embodiment, the electrolyte flow rate adjustment device: is installed between the liquid tank and the stack pipeline of the flow battery system and is used to adjust the electrolyte flow rate in the pipeline; to ensure the stability and efficiency of the electrolyte flow inside the battery.

[0029] In this embodiment, the flow monitoring device is installed between the liquid tank of the flow battery system and the stack pipeline, and is used to monitor the electrolyte flow rate in the pipeline in real time; the electrolyte flow rate in the flow battery has an important impact on the performance and safety of the battery. Through the flow monitoring device, the flow rate of the electrolyte can be monitored in real time to ensure that it is within the normal range. When the flow rate exceeds or is lower than the normal range, the device will immediately issue an alarm to remind the operator to take corresponding measures to avoid battery failures or accidents.

[0030] In addition, the flow monitoring device of the flow battery can also provide data support for the maintenance and servicing of the battery. By analyzing the monitored data, the operating status and health condition of the battery can be understood, providing a basis for timely replacement or repair of the battery and extending the service life of the battery.

[0031] In this embodiment, the pressure detection device is installed between the liquid tank of the flow battery system and the stack pipeline, and is used to monitor the pressure in the pipeline in real time; it plays an important role in ensuring the safe and stable operation of the flow battery.

[0032] In this embodiment, the pipeline valve automatic opening and closing device is installed at the liquid inlet and outlet of the liquid tank of the flow battery system, and is used for remote operation to open and close; it realizes the automatic circulation and stop of the electrolyte inside the battery, improving the operating efficiency, safety and automation level of the flow battery.

[0033] In this embodiment, an exhaust device for drying and filtering the hydrogen gas precipitated in the liquid tank and a hydrogen gas metering device for real-time monitoring of the hydrogen evolution situation in the liquid tank are also installed on the liquid tank; the exhaust device ensures the smooth flow of the internal gas of the battery and maintains the normal operation of the battery; the hydrogen gas metering device plays an important role in ensuring the safe and stable operation of the flow battery.

[0034] Working principle: A flow monitoring device is provided on the pipeline of the present invention to monitor the flow rate and flow of the electrolyte in the positive and negative pipelines in real time; a pressure monitoring device monitors the liquid flow pressure in the positive and negative pipelines in real time. After the device feeds back the data to the system, the system will combine the two data to judge whether the electrolyte flow rate flowing into the stack is uniform. When the flow rate on one side of the positive or negative electrolyte pipeline is abnormal (the flow velocity / flow rate is inconsistent or the pressure is too high / low), the system will automatically increase or decrease the electrolyte flow rate in the pipeline through the electrolyte flow rate adjustment device to achieve flow rate uniformity; The positive and negative liquid tanks of the present invention are arranged with liquid level monitoring devices, which monitor the liquid level value in the liquid tank in real time. When it is found that the electrolyte liquid levels in the positive and negative liquid tanks are uneven, the device will hand over the value to the system, and the system will automatically adjust the electrolyte flow rate adjustment device of the pipeline belonging to the liquid tank with the higher liquid level, increase the electrolyte flow rate in the pipeline, and accelerate the electrolyte flow to lower the liquid level of the liquid tank. When the liquid levels of the positive and negative liquid tanks are basically adjusted evenly, the system will restore the electrolyte flow rate to the value before adjustment through the electrolyte flow rate adjustment device; Leakage monitoring devices are arranged in both the positive and negative liquid tanks and the stack chamber of the present invention to detect whether leakage occurs in real time. If leakage is detected, an alarm will be given and uploaded to the system. The automatic charge and discharge device will stop charging and discharging, and the pump speed will be quickly reduced step by step through the electrolyte flow rate adjustment device until the electrolyte delivery stops, and the pipeline valve will be automatically closed by the pipeline valve automatic opening and closing device to prevent the leakage situation from deteriorating further.

[0035] In summary, for the flow battery system and its liquid path warning method, in the present invention, flow monitoring devices are provided on the pipelines to monitor the flow rate and flow volume of the electrolytes in the positive and negative pipelines in real time; pressure monitoring devices monitor the liquid flow pressure in the positive and negative pipelines in real time. After the devices feed back the data to the system, the system will combine the two sets of data to determine whether the flow volume of the electrolytes flowing into the stack is uniform. When the flow volume on one side of the positive or negative electrolyte pipeline is abnormal (the flow rate / flow volume is inconsistent or the pressure is too high / low), the system will automatically increase or decrease the flow rate of the electrolytes in that pipeline through the electrolyte flow rate adjustment device to achieve flow rate uniformity; for the flow battery system and its liquid path warning method, level monitoring devices are arranged in the positive and negative liquid tanks. The devices monitor the liquid level values in the liquid tanks in real time. When it is found that the electrolyte liquid levels in the positive and negative liquid tanks are uneven, the devices will submit the values to the system. The system will automatically adjust the electrolyte flow rate adjustment device of the pipeline belonging to the liquid tank with a higher liquid level, increase the flow rate of the electrolytes in that pipeline, and accelerate the flow of the electrolytes to lower the liquid level of the liquid tank. After the liquid levels in the positive and negative liquid tanks are basically adjusted evenly, the system will restore the flow rate of the electrode liquid to the value before adjustment through the electrolyte flow rate adjustment device; further improving the safety of the flow battery system, thereby extending the service life of the flow battery; for the flow battery system and its liquid path warning method, leakage monitoring devices are arranged in both the positive and negative liquid tanks and the stack chamber to detect whether leakage occurs in real time. If leakage is detected, an alarm will be issued and uploaded to the system. The automatic charge and discharge device will stop charging and discharging, and the pump speed will be quickly reduced step by step through the electrolyte flow rate adjustment device until the electrolyte delivery stops. The pipeline valve automatic opening and closing device will automatically close the valve to prevent the leakage situation from deteriorating further, thereby ensuring the safety of the flow battery system.

[0036] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0037] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flow battery system and a liquid path warning method thereof, characterized in that: The flow battery system includes a stack compartment and a liquid tank. Inside the stack compartment, there are several stacks and a harmful gas monitoring device. Connected to the stack are a voltage and current detection device, an automatic charge and discharge device, and a stack liquid leakage monitoring device for real-time monitoring of whether liquid leakage occurs in the stack compartment and giving early warnings. The stack is connected to the liquid tank through a pipeline. Installed in sequence on the connection pipeline between the stack and the liquid tank are an electrolyte flow rate adjustment device, a flow rate monitoring device for real-time monitoring of the electrolyte flow rate in the pipeline, a pressure detection device, and a pipeline valve automatic opening and closing device. Installed on the liquid tank are a liquid level detection device for real-time monitoring of the liquid level height in the liquid tank and a liquid tank leakage monitoring device for real-time monitoring of whether liquid leakage occurs in the liquid tank and capable of giving early warnings; The liquid path early warning method includes the following steps: Step S1: The flow rate monitoring device monitors the electrolyte flow rate and flow rate in real time, and the pressure monitoring device monitors the flow pressure of the electrolyte in the pipeline in real time, and transmits the data to the system; Step S2: The system combines the two data to judge whether the electrolyte flow rate flowing into the stack is uniform; Step S3: If the electrolyte flow rate is uniform, the flow battery system operates normally. If the electrolyte flow rate is not uniform, the flow battery system automatically increases or decreases the electrolyte flow rate in this pipeline through the electrolyte flow rate adjustment device to achieve flow rate uniformity.

2. The flow battery system and its liquid path warning method according to claim 1, characterized in that: The liquid path early warning method further includes the following steps: Step 1: The liquid level detection device monitors the liquid level value in the liquid tank in real time, and observes whether the positive and negative electrolyte liquid levels in the liquid tank are uniform. If the electrolyte liquid levels are uniform, the flow battery system operates normally. If the electrolyte liquid levels are not uniform, the liquid level monitoring device issues an alarm and enters Step 2; Step 2: The liquid level detection device transmits the value to the system, and the system automatically adjusts the electrolyte flow rate adjustment device of the pipeline to which the liquid tank with a higher liquid level belongs, increases the electrolyte flow rate in this pipeline, and makes the liquid level of the liquid tank drop until the positive and negative liquid levels are uniform, and enters Step 1.

3. The flow battery system and its liquid path early warning method according to claim 1, characterized in that: The liquid path early warning method further includes the following steps: Step SS1: The stack leakage monitoring device monitors whether the stack leaks in real time, and the liquid tank leakage monitoring device monitors whether the liquid tank leaks in real time. If no leakage occurs, the flow battery system operates normally. If leakage occurs, enter Step SS2; Step SS2: The leakage monitoring device that detects leakage issues an alarm and transmits it to the system, and enters Step SS3; Step SS3: The system controls the automatic charge and discharge device to stop charging and discharging, and quickly reduces the pump speed step by step until the electrolyte delivery stops through the electrolyte flow rate adjustment device. At the same time, the pipeline valve automatic opening and closing device automatically closes the valve, and enters Step SS4; Step SS4: Replace the stack or liquid tank with leakage, and enter Step SS1.

4. A flow battery system and its liquid path early warning method according to claim 1, characterized in that: The harmful gas monitoring device is installed in the stack compartment of the flow battery system for real-time monitoring of harmful gases in the air in the stack compartment, and can give early warnings when the harmful gas value reaches the preset value.

5. A flow battery system and its liquid path early warning method according to claim 1, characterized in that: The automatic charge and discharge device is connected to the stack of the flow battery system for automatically adjusting the charge and discharge current and voltage.

6. The flow battery system and its liquid path warning method according to claim 1, characterized in that: The electrolyte flow rate adjustment device: It is installed between the liquid tank of the flow battery system and the stack pipeline, and is used to adjust the flow rate of the electrolyte in the pipeline.

7. A flow battery system and a liquid path early warning method thereof according to claim 1, characterized in that: The flow rate monitoring device is installed between the liquid tank of the flow battery system and the stack pipeline, and is used to monitor the flow rate of the electrolyte in the pipeline in real time.

8. A flow battery system and a liquid path early warning method thereof according to claim 1, characterized in that: The pressure detection device is installed between the liquid tank of the flow battery system and the stack pipeline, and is used to monitor the pressure in the pipeline in real time.

9. A flow battery system and its liquid path early warning method according to claim 1, characterized in that: The pipeline valve automatic opening and closing device is installed at the liquid inlet and outlet of the liquid tank of the flow battery system, and is used for remote operation to open and close.

10. A flow battery system and a liquid path warning method thereof according to claim 1, characterized in that: An exhaust device for drying and filtering the hydrogen gas precipitated in the liquid tank and a hydrogen gas metering device for monitoring the hydrogen evolution situation in the liquid tank in real time are also installed on the liquid tank.

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