Liquid level monitoring and alarming device and method for flow battery

Abstract

The invention discloses a liquid level monitoring and alarming device and method for a flow battery. The liquid level monitoring alarm device of the flow battery comprises a liquid level detection module, a data analysis module and an alarm module, the liquid level detection module is arranged in a liquid storage device of the flow battery, and the liquid level detection module is used for monitoring the real-time liquid level of electrolyte in the liquid storage device and sending the real-time liquid level to the data analysis module; the data analysis module is used for generating different alarm signals and liquid supplementing prompt signals according to the real-time liquid level and sending the alarm signals and the liquid supplementing prompt signals to the alarm module; and the alarm module is used for generating corresponding alarm information according to the received alarm signal and generating corresponding liquid supplementing prompt information according to the received liquid supplementing prompt signal. According to the invention, the problem of insufficient liquid level of the electrolyte in the circulation and charge-discharge process of the liquid storage tank can be effectively solved, and the operation efficiency and management capability of the flow battery are improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of batteries, and in particular, to a liquid level monitoring and alarming device and method for a flow battery. Background Art

[0002] Currently, with the development of battery technology, large-scale energy storage devices represented by flow batteries have developed rapidly in recent years and gradually entered the large-scale demonstration stage.

[0003] However, during the operation of a flow battery, the positive and negative electrode electrolytes of the flow battery migrate through an ion exchange membrane in the stack, thereby causing a change in the liquid level of the electrolyte in the liquid storage tank of the flow battery. Since there are clear requirements for the liquid level range of the liquid storage tank, it is necessary to monitor the liquid level data of the liquid storage tank every day and take corresponding countermeasures. In the prior art, manual liquid level measurement is carried out every day when the flow battery is in the standby non-operating state, and whether to replenish the liquid is determined according to the standard. This method has the following defects: 1. Low efficiency: Manual operation is required when the equipment is shut down, affecting the continuity of equipment operation; 2. Error risk: Manual judgment is easily affected by subjective factors, and it is difficult to ensure the accuracy of data; 3. Response lag: The liquid level abnormality cannot be monitored in real time; 4. Single function: The traditional measurement method lacks the ability of automatic diagnosis of the flow battery. Summary of the Invention

[0004] The present invention provides a liquid level monitoring and alarming device and method for a flow battery to improve the detection efficiency of the liquid level data of the liquid storage tank in the flow battery, reduce the liquid level detection error, timely detect the liquid level abnormality, effectively cope with the problem of insufficient liquid level of the electrolyte in the liquid storage tank during the circulation and charge and discharge processes, and improve the operation efficiency and management ability of the flow battery.

[0005] In a first aspect, an embodiment of the present invention provides a liquid level monitoring and alarming device for a flow battery, where the device includes a liquid level detection module, a data analysis module, and an alarm module;

[0006] The liquid level detection module is arranged in the liquid storage device of the flow battery, the liquid level detection module is connected to the data analysis module, and the liquid level detection module is used to monitor the real-time liquid level of the electrolyte in the liquid storage device and send the real-time liquid level to the data analysis module;

[0007] The data analysis module is connected to the alarm module, and the data analysis module is used to generate different alarm signals and liquid replenishment prompt signals according to the magnitude of the real-time liquid level, and send the alarm signals and the liquid replenishment prompt signals to the alarm module;

[0008] The alarm module is used to generate corresponding alarm information according to the received alarm signal and generate corresponding liquid supplement prompt information according to the received liquid supplement prompt signal.

[0009] Optionally, the liquid level detection module is a float-type liquid level sensor; the float-type liquid level sensor is placed in the electrolyte in the liquid storage device.

[0010] Optionally, the device further includes a monitoring and management module;

[0011] There are 2N liquid level detection modules, and the 2N liquid level detection modules are respectively arranged in the liquid storage devices of N flow batteries; the 2N liquid level detection modules are connected to the first serial port through twisted pair wires, and the first serial port is connected to the data analysis module through an optical cable; where N is any positive integer, and the liquid storage device includes a first-pole liquid storage device and a second-pole liquid storage device;

[0012] The monitoring and management module is installed in the energy management system where N flow batteries are located, and the monitoring and management module is communicatively connected to the alarm module and the data analysis module; the monitoring and management module is used to remotely receive the real-time liquid level, the alarm information, and the liquid supplement prompt information.

[0013] In a second aspect, an embodiment of the present invention further provides a method for monitoring and alarming the liquid level of a flow battery. The method for monitoring and alarming the liquid level of a flow battery is applied to the device for monitoring and alarming the liquid level of a flow battery according to any embodiment of the present invention. The method includes:

[0014] Obtain the real-time liquid level of the electrolyte in the liquid storage device;

[0015] Generate different alarm signals and liquid supplement prompt signals according to the magnitude of the real-time liquid level, and generate alarm information corresponding to the alarm signal through the alarm module, and generate liquid supplement prompt information corresponding to the liquid supplement prompt signal through the alarm module.

[0016] Further, the generating different alarm signals and liquid supplement prompt signals according to the magnitude of the real-time liquid level includes:

[0017] When the real-time liquid level continuously decreases and the real-time liquid level is less than or equal to the first liquid supplement preset value, generate a first liquid supplement prompt signal;

[0018] When the real-time liquid level is less than or equal to the first alarm preset value, generate a first alarm signal;

[0019] When the real-time liquid level is less than or equal to the second alarm preset value, generate a second alarm signal and control the flow battery to shut down;

[0020] Wherein, the first liquid replenishment prompt signal is used to cause the alarm module to generate a liquid replenishment prompt; the first liquid replenishment preset value is greater than the first alarm preset value, and the first alarm preset value is greater than the second alarm preset value.

[0021] Further, generating different alarm signals and liquid replenishment prompt signals according to the magnitude of the real-time liquid level further includes:

[0022] When the real-time liquid level continuously rises and the real-time liquid level is greater than or equal to the second liquid replenishment preset value, a second liquid replenishment prompt signal is generated;

[0023] When the real-time liquid level is greater than or equal to the third alarm preset value, a third alarm signal is generated;

[0024] When the real-time liquid level is greater than or equal to the fourth alarm preset value, a fourth alarm signal is generated and the flow battery is controlled to shut down;

[0025] Wherein, the second liquid replenishment prompt signal is used to cause the alarm module to generate a liquid replenishment completion prompt; the second liquid replenishment preset value is greater than the first liquid replenishment preset value, the third alarm preset value is greater than the second liquid replenishment preset value, and the fourth alarm preset value is greater than the third alarm preset value.

[0026] Further, the method further includes:

[0027] Obtaining the liquid level of the electrolyte in the liquid storage device when the flow battery is started this time and the liquid level of the electrolyte in the liquid storage device when the flow battery was shut down last time;

[0028] Generating a liquid leakage alarm signal according to the difference between the liquid level of the electrolyte in the liquid storage device when the flow battery is started this time and the liquid level of the electrolyte in the liquid storage device when the flow battery was shut down last time.

[0029] Further, generating a liquid leakage alarm signal according to the difference between the liquid level of the electrolyte in the liquid storage device when the flow battery is started this time and the liquid level of the electrolyte in the liquid storage device when the flow battery was shut down last time includes:

[0030] If the liquid level of the electrolyte in the first electrode of the liquid storage device when the flow battery is started this time increases by a first preset value compared with the liquid level of the electrolyte in the first electrode of the liquid storage device when the flow battery was shut down last time, and the liquid level of the electrolyte in the second electrode of the liquid storage device when the flow battery is started this time decreases by a second preset value compared with the liquid level of the electrolyte in the second electrode of the liquid storage device when the flow battery was shut down last time, and the difference between the first preset value and the second preset value is less than a preset range, an internal liquid leakage alarm signal is generated and the flow battery is controlled to shut down.

[0031] Further, generating a leakage alarm signal according to the difference between the liquid level of the electrolyte in the liquid storage device when the flow battery is started this time and the liquid level of the electrolyte in the liquid storage device when the flow battery was shut down last time includes:

[0032] If the difference between the liquid level of the first electrolyte in the liquid storage device when the flow battery is started this time and the liquid level of the first electrolyte in the liquid storage device when the flow battery was shut down last time is greater than a preset difference, an external leakage alarm signal is generated.

[0033] Further, the method further includes:

[0034] Obtaining the vertex height of the heater in the liquid storage device;

[0035] When the real-time liquid level is less than or equal to the vertex height, controlling the heater to stop working.

[0036] The present invention provides a liquid level monitoring and alarm device and method for a flow battery. The liquid level monitoring and alarm device for the flow battery includes a liquid level detection module, a data analysis module, and an alarm module. The liquid level detection module is arranged in the liquid storage device of the flow battery. The liquid level detection module is connected to the data analysis module. The liquid level detection module can monitor the real-time liquid level of the electrolyte in the liquid storage device in real time, so as to improve the detection efficiency of the liquid level data of the liquid storage tank in the flow battery and reduce the liquid level detection error. The data analysis module generates different alarm signals and liquid supplement prompt signals according to the size of the real-time liquid level, and sends the alarm signals and liquid supplement prompt signals to the alarm module, so as to detect liquid level anomalies in time. The alarm module is used to generate corresponding alarm information according to the received alarm signal and generate corresponding liquid supplement prompt information according to the received liquid supplement prompt signal, so as to ensure that relevant personnel can receive the alarm information and liquid supplement prompt information in time and take corresponding measures to prevent potential hazards caused by insufficient or excessive liquid level. The present invention can effectively address the problem of insufficient liquid level of the electrolyte in the liquid storage tank during the circulation and charge-discharge process, and improve the operation efficiency and management ability of the flow battery. Description of the Drawings

[0037] Figure 1 It is a schematic structural diagram of a liquid level monitoring and alarm device for a flow battery provided by an embodiment of the present invention;

[0038] Figure 2 It is an installation schematic diagram of the liquid level detection module provided by an embodiment of the present invention;

[0039] Figure 3 It is a schematic structural diagram of another liquid level monitoring and alarm device for a flow battery provided by an embodiment of the present invention;

[0040] Figure 4Flow chart of a liquid level monitoring and alarming method for a flow battery according to an embodiment of the present invention;

[0041] Figure 5 Flow chart of another liquid level monitoring and alarming method for a flow battery according to an embodiment of the present invention. Detailed implementation manners

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that, for the sake of convenience of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0043] An embodiment of the present invention provides a liquid level monitoring and alarming device for a flow battery, Figure 1 Structural schematic diagram of a liquid level monitoring and alarming device for a flow battery provided by an embodiment of the present invention, Figure 2 Installation schematic diagram of a liquid level detection module provided by an embodiment of the present invention. As Figure 1 shown, the liquid level monitoring and alarming device for a flow battery includes a liquid level detection module 110, a data analysis module 120, and an alarm module 130.

[0044] The liquid level detection module 110 is disposed in the liquid storage device A1 of the flow battery. The liquid level detection module 110 is connected to the data analysis module 120. The liquid level detection module 110 is used to monitor the real-time liquid level of the electrolyte in the liquid storage device A1 and send the real-time liquid level to the data analysis module 120. The data analysis module 120 is connected to the alarm module 130. The data analysis module 120 is used to generate different alarm signals and liquid replenishment prompt signals according to the magnitude of the real-time liquid level, and send the alarm signals and liquid replenishment prompt signals to the alarm module 130. The alarm module 130 is used to generate corresponding alarm information according to the received alarm signals and generate corresponding liquid replenishment prompt information according to the received liquid replenishment prompt signals.

[0045] Among them, the liquid level monitoring and alarming device for a flow battery applies the liquid level detection module 110 in the liquid storage device A1 of the flow battery. By using the liquid level monitoring sensor 110 and the data analysis module 120, it is possible to realize real-time monitoring of the liquid level change in a specific area. When the liquid level fluctuates abnormally or approaches the lower limit value, early warning information is pushed in a timely manner to prevent potential hazards caused by abnormal liquid levels.

[0046] Specifically, the liquid level detection module 110 is disposed within the liquid storage device A1 of the flow battery. The liquid level detection module 110 can monitor the real-time liquid level of the electrolyte within the liquid storage device A1, so as to improve the detection efficiency of the liquid level data of the liquid storage tank in the flow battery, reduce the liquid level detection error, solve the problems of large manual detection error and long time, and the detection process does not affect the normal operation of the flow battery, reducing the labor cost. The liquid level detection module 110 can be various forms of sensors, such as a float type liquid level sensor, an image sensor, an infrared sensor, etc. Through various forms of detection methods, the real-time liquid level of the electrolyte within the liquid storage device A1 can be detected. The liquid level detection module 110 can also display the actual position of the liquid through a display instrument, so as to achieve remote detection and control of the liquid level. By monitoring the liquid level height within the liquid storage device A1 in real time, accurate data support is provided for the alarm strategy.

[0047] The liquid level detection module 110 sends the real-time liquid level to the data analysis module 120. The data analysis module 120 is connected to the alarm module 130. The data analysis module 120 can generate different alarm signals and liquid supplement prompt signals according to the size of the real-time liquid level. Exemplarily, the data analysis module 120 can generate corresponding alarm signals when the real-time liquid level in the liquid storage device A1 is too large or too small, and can also generate corresponding liquid supplement prompt signals when the real-time liquid level in the liquid storage device A1 is below the preset value, and prompt that the liquid supplement is completed when it exceeds the preset value. In addition, the data analysis module 120 can also judge whether there is an internal leak in the flow battery according to the change of the real-time liquid level. At the same time, the data analysis module 120 sends the alarm signal and the liquid supplement prompt signal to the alarm module 130. The alarm module 130 is used to generate corresponding alarm information according to the received alarm signal and generate corresponding liquid supplement prompt information according to the received liquid supplement prompt signal, so as to ensure that relevant personnel can receive the alarm information and the liquid supplement prompt information in time and take corresponding measures to prevent potential hazards caused by insufficient or excessive liquid level, and can effectively cope with the problem of insufficient liquid level of the electrolyte during the circulation and charge-discharge process of the liquid storage tank, improving the operation efficiency and management ability of the flow battery.

[0048] An embodiment of the present invention provides a liquid level monitoring and alarming device for a flow battery. The device includes a liquid level detection module, a data analysis module, and an alarming module. The liquid level detection module is disposed in the liquid storage device of the flow battery. The liquid level detection module is connected to the data analysis module. The liquid level detection module can monitor the real-time liquid level of the electrolyte in the liquid storage device in real time, so as to improve the detection efficiency of the liquid level data of the liquid storage tank in the flow battery and reduce the liquid level detection error. The data analysis module generates different alarm signals and liquid supplement prompt signals according to the magnitude of the real-time liquid level, and sends the alarm signals and liquid supplement prompt signals to the alarming module, so as to timely detect abnormal liquid levels. The alarming module is used to generate corresponding alarm information according to the received alarm signals and generate corresponding liquid supplement prompt information according to the received liquid supplement prompt signals, so as to ensure that relevant personnel can receive the alarm information and liquid supplement prompt information in time and take corresponding measures to prevent potential hazards caused by insufficient or excessive liquid levels. The embodiment of the present invention can effectively address the problem of insufficient liquid level of the electrolyte in the liquid storage tank during the circulation and charge-discharge processes, and improve the operation efficiency and management ability of the flow battery.

[0049] Optionally, the liquid level detection module 110 is a float-type liquid level sensor; the float-type liquid level sensor is placed in the electrolyte in the liquid storage device A1.

[0050] Among them, the float-type liquid level sensor can utilize the magnet in the float to change the voltage-dividing circuit composed of the resistance in the connecting rod and the magnetic reed switch as the liquid level in the liquid storage device A1 changes. The voltage-dividing signal is converted into a 4-20 mA standard signal through a converter, and the actual position of the liquid level of the electrolyte is displayed through a display instrument, so as to achieve remote detection and control of the liquid level.

[0051] Figure 3 FIG. is a schematic structural diagram of another liquid level monitoring and alarming device for a flow battery provided by an embodiment of the present invention. As Figure 3 shown, the liquid level monitoring and alarming device for the flow battery further includes a monitoring and management module 140.

[0052] There are 2N liquid level detection modules 110, and the 2N liquid level detection modules 110 are respectively disposed in the liquid storage devices A1 of N flow batteries; the 2N liquid level detection modules 110 are connected to a first serial port N1 through twisted pairs, and the first serial port N1 is connected to the data analysis module 120 through an optical cable; wherein, N is any positive integer, and the liquid storage device A1 includes a first-pole liquid storage device A1-1 and a second-pole liquid storage device A1-2.

[0053] The monitoring and management module 140 is installed in the energy management system where the N flow batteries are located. The monitoring and management module 140 is communicatively connected to the alarming module 130 and the data analysis module 120; the monitoring and management module 140 is used to remotely receive the real-time liquid level, alarm information, and liquid supplement prompt information.

[0054] Among them, there are 2N liquid level detection modules 110, and the 2N liquid level detection modules 110 are respectively arranged in the first-pole liquid storage device A1-1 and the second-pole liquid storage device A1-2 in the liquid storage device A1 of N flow batteries. The first-pole liquid storage device A1-1 can be an anode liquid storage tank, and the second-pole liquid storage device A1-2 can be a cathode liquid storage tank. The real-time liquid levels detected by the liquid level detection modules 110 can be aggregated to the human-machine interface in various ways. Common methods include using technologies such as serial communication and fieldbus to transmit the data measured by the sensors to the human-machine interface for display and control. In the embodiment of the present invention, the 2N liquid level detection modules 110 are connected to the first serial port N1 through twisted pairs, and the first serial port N1 is then connected to the data analysis module 120 through an optical cable, Figure 3 where the red line represents the twisted pair and the yellow line represents the optical cable, so as to realize data transmission. The monitoring and management module 140 can be composed of a display and a host computer, and is installed in the energy management system where N flow batteries are located. The data received by the monitoring and management module 140 can be stored in the background server of the energy management system, and the data can be saved for more than 3 years. The data analysis module 120 has strong data processing and computing capabilities, and can intelligently analyze the received real-time liquid level information and historical data to form a data report, providing accurate data support for decision-making.

[0055] Specifically, the monitoring and management module 140 is communicatively connected to the alarm module 130 and the data analysis module 120; the monitoring and management module 140 is used to remotely receive real-time liquid levels, alarm information and liquid addition prompt information. Through the monitoring and management module 140, it can be ensured that relevant personnel receive the alarm information and liquid addition prompt information, so as to take corresponding measures to prevent potential hazards caused by insufficient or excessive liquid levels. Exemplarily, the monitoring and management module 140 can send the alarm information and liquid addition prompt information to the electronic devices of relevant personnel through methods such as text messages, WeChat, and emails, ensuring that relevant personnel can receive and take corresponding measures in time. The electronic devices can be terminals such as computers, mobile phone APPs, and tablets. Relevant personnel can remotely monitor and manage the liquid level situation, and can view the liquid level changes in real time, receive alarm information, query historical data, etc., improving the management efficiency and response speed. Through this alarm strategy based on real-time liquid level monitoring, it can effectively cope with the insufficient water level in the liquid tank during the circulation and charge-discharge processes, and improve the operation efficiency and management ability of the electrolyte.

[0056] The liquid level monitoring and alarm device of the flow battery in the embodiment of the present invention can be applied to application scenarios such as electrolyte circulation monitoring of large-scale flow battery energy storage power stations, energy storage unit management of distributed new energy systems, and liquid level safety control of industrial electrolyte storage tanks, so as to improve the automatic management level and operation safety of flow batteries.

[0057] An embodiment of the present invention also provides a method for monitoring and alarming the liquid level of a flow battery. The method for monitoring and alarming the liquid level of a flow battery is applied to the device for monitoring and alarming the liquid level of a flow battery according to any embodiment of the present invention. Figure 4 It is a flowchart of a method for monitoring and alarming the liquid level of a flow battery according to an embodiment of the present invention, as Figure 4 shown. The method includes:

[0058] S110. Obtain the real-time liquid level of the electrolyte in the liquid storage device.

[0059] Among them, in combination with Figure 1-2 , through the liquid level detection module 110 arranged in the liquid storage device A1 of the flow battery, the real-time liquid level of the electrolyte in the liquid storage device A1 can be monitored, so as to improve the detection efficiency of the liquid level data of the liquid storage tank in the flow battery and reduce the liquid level detection error. By obtaining the real-time liquid level detected by the liquid level detection module 110, accurate data support can be provided for the alarm strategy.

[0060] S120. Generate different alarm signals and liquid supplement prompt signals according to the size of the real-time liquid level, and generate alarm information corresponding to the alarm signals through the alarm module, and generate liquid supplement prompt information corresponding to the liquid supplement prompt signals through the alarm module.

[0061] Specifically, corresponding alarm signals can be generated when the real-time liquid level of the liquid storage device A1 is too large or too small, and corresponding liquid supplement prompt signals can also be generated when the real-time liquid level of the liquid storage device A1 is lower than the preset value, and it is prompted that the liquid supplement is completed when it exceeds the preset value. In addition, it is also possible to judge whether there is an internal leak in the flow battery according to the change of the real-time liquid level. Generate alarm information corresponding to the alarm signals through the alarm module 130, and generate liquid supplement prompt information corresponding to the liquid supplement prompt signals through the alarm module 130, so as to ensure that relevant personnel can receive the alarm information and liquid supplement prompt information in time and take corresponding measures to prevent potential harm caused by insufficient or too high liquid level, and can effectively cope with the problem of insufficient liquid level of the electrolyte in the liquid storage tank during the cycle and charge and discharge processes, and improve the operation efficiency and management ability of the flow battery.

[0062] An embodiment of the present invention provides a method for monitoring and alarming the liquid level of a flow battery. This method obtains the real-time liquid level of the electrolyte in the liquid storage device, so as to timely detect abnormal liquid levels, generate different alarm signals and liquid supplement prompt signals according to the size of the real-time liquid level, and generate alarm information corresponding to the alarm signals through the alarm module, and generate liquid supplement prompt information corresponding to the liquid supplement prompt signals through the alarm module, so as to ensure that relevant personnel can receive the alarm information and liquid supplement prompt information in time and take corresponding measures to prevent potential harm caused by insufficient or too high liquid level. The embodiment of the present invention can effectively cope with the problem of insufficient liquid level of the electrolyte in the liquid storage tank during the cycle and charge and discharge processes, and improve the operation efficiency and management ability of the flow battery.

[0063] Further, different alarm signals and liquid supplement prompt signals are generated according to the magnitude of the real-time liquid level, including:

[0064] When the real-time liquid level continuously decreases and the real-time liquid level is less than or equal to the first liquid supplement preset value, a first liquid supplement prompt signal is generated.

[0065] When the real-time liquid level is less than or equal to the first alarm preset value, a first alarm signal is generated.

[0066] When the real-time liquid level is less than or equal to the second alarm preset value, a second alarm signal is generated and the flow battery is controlled to shut down.

[0067] Among them, the first liquid supplement prompt signal is used to cause the alarm module to generate a liquid supplement prompt; the first liquid supplement preset value is greater than the first alarm preset value, and the first alarm preset value is greater than the second alarm preset value.

[0068] Specifically, when the real-time liquid level continuously decreases and the real-time liquid level is less than or equal to the first liquid supplement preset value, a first liquid supplement prompt signal is generated, so that the alarm module 130 generates a liquid supplement prompt, prompting to supplement the electrolyte to the liquid storage device A1 to ensure that the electrolyte in the liquid storage device A1 is at a safe liquid level. When the real-time liquid level is less than or equal to the first alarm preset value, the first alarm preset value can be a value when the electrolyte level in the liquid storage device A1 is too low, and a first alarm signal is generated. The first alarm signal can cause the alarm module 130 to generate a first alarm message, prompting that the electrolyte level in the liquid storage device A1 is too low. When the real-time liquid level is less than or equal to the second alarm preset value, the second alarm preset value can be a value when the electrolyte level in the liquid storage device A1 is seriously too low, and a second alarm signal is generated. The second alarm signal can cause the alarm module 130 to generate a second alarm message, prompting that the electrolyte level in the liquid storage device A1 is seriously too low, and controlling the flow battery to enter the shutdown state.

[0069] Further, different alarm signals and liquid supplement prompt signals are generated according to the magnitude of the real-time liquid level, and it also includes:

[0070] When the real-time liquid level continuously rises and the real-time liquid level is greater than or equal to the second liquid supplement preset value, a second liquid supplement prompt signal is generated.

[0071] When the real-time liquid level is greater than or equal to the third alarm preset value, a third alarm signal is generated.

[0072] When the real-time liquid level is greater than or equal to the fourth alarm preset value, a fourth alarm signal is generated and the flow battery is controlled to shut down.

[0073] Wherein, the second liquid replenishment prompt signal is used to cause the alarm module to generate a liquid replenishment completion prompt; the second liquid replenishment preset value is greater than the first liquid replenishment preset value, the third alarm preset value is greater than the second liquid replenishment preset value, and the fourth alarm preset value is greater than the third alarm preset value.

[0074] Specifically, when the real-time liquid level continuously rises, indicating that the electrolyte is being replenished in the liquid storage device A1, and the real-time liquid level is greater than or equal to the second liquid replenishment preset value, a second liquid replenishment prompt signal is generated. The second liquid replenishment prompt signal can cause the alarm module 130 to generate a liquid replenishment completion prompt, prompting relevant personnel that the liquid replenishment is completed, thereby stopping the liquid replenishment to prevent the electrolyte in the liquid storage device A1 from being too high. When the real-time liquid level is greater than or equal to the third alarm preset value, the third alarm preset value can be the value when the electrolyte liquid level in the liquid storage device A1 is too high, a third alarm signal is generated, and the third alarm signal can cause the alarm module 130 to generate a third alarm message, thereby prompting that the liquid level of the electrolyte in the liquid storage device A1 is too high. When the real-time liquid level is greater than or equal to the fourth alarm preset value, the fourth alarm preset value can be the value when the electrolyte liquid level in the liquid storage device A1 is seriously too high, a fourth alarm signal is generated, and the fourth alarm preset value can cause the alarm module 130 to generate a fourth alarm message, thereby prompting that the liquid level of the electrolyte in the liquid storage device A1 is seriously too high, and controlling the flow battery to switch to the shutdown state. Thus, it prevents potential hazards caused by insufficient or too high liquid level in the liquid storage device A1, effectively addresses the problem of insufficient liquid level of the electrolyte during the circulation and charge-discharge process of the liquid storage tank, and improves the operation efficiency and management ability of the flow battery.

[0075] Further, Figure 5 is a flowchart of another liquid level monitoring and alarm method for a flow battery according to an embodiment of the present invention. As Figure 5 shown, the method further includes:

[0076] S210. Obtain the liquid level of the electrolyte in the liquid storage device when the flow battery is started this time and the liquid level of the electrolyte in the liquid storage device when the flow battery was shut down last time.

[0077] Specifically, referring to Figure 1-3 , since during the operation of the flow battery, the liquid level detection module 11 can monitor the real-time liquid level of the electrolyte in the liquid storage device A1, the liquid level of the electrolyte in the liquid storage device A1 when the flow battery is started this time is the real-time liquid level of the electrolyte in the liquid storage device A1 obtained by the liquid level detection module 11. The liquid level of the electrolyte in the liquid storage device A1 when the flow battery was shut down last time can be obtained from the historical liquid level of the liquid storage device A1 stored in the monitoring and management module 140. By obtaining the liquid level of the electrolyte in the liquid storage device A1 when the flow battery is started this time and the liquid level of the electrolyte in the liquid storage device A1 when the flow battery was shut down last time, the two liquid levels can be compared and analyzed to determine whether there is a liquid leakage abnormality in the flow battery.

[0078] S220. Generate a leakage alarm signal based on the difference between the liquid level of the electrolyte in the liquid storage device when the flow battery is started this time and the liquid level of the electrolyte in the liquid storage device when the flow battery was shut down last time.

[0079] Specifically, referring to Figure 1-3 , when the difference between the liquid level of the electrolyte in the liquid storage device A1 when the flow battery is started this time and the liquid level of the electrolyte in the liquid storage device A1 when the flow battery was shut down last time is greater than a certain range, it can be determined that there is a leakage in the flow battery, and thus a leakage alarm signal is generated, enabling the alarm module 130 to generate a leakage alarm message based on the leakage alarm signal, so as to ensure that relevant personnel can receive the leakage alarm message in a timely manner and take corresponding measures to promptly eliminate the leakage abnormality of the flow battery and improve the operation efficiency and management ability of the flow battery.

[0080] Optionally, generating a leakage alarm signal based on the difference between the liquid level of the electrolyte in the liquid storage device when the flow battery is started this time and the liquid level of the electrolyte in the liquid storage device when the flow battery was shut down last time includes:

[0081] If the liquid level of the electrolyte of the first electrode in the liquid storage device when the flow battery is started this time increases by a first preset value compared to the liquid level of the electrolyte of the first electrode in the liquid storage device when the flow battery was shut down last time, and the liquid level of the electrolyte of the second electrode in the liquid storage device when the flow battery is started this time decreases by a second preset value compared to the liquid level of the electrolyte of the second electrode in the liquid storage device when the flow battery was shut down last time, and the difference between the first preset value and the second preset value is less than a preset range, then generate an internal leakage alarm signal and control the flow battery to shut down.

[0082] Among them, referring to Figure 1-3 , the electrolyte of the first electrode is located in the first - electrode liquid storage device A1 - 1, and the electrolyte of the second electrode is located in the second - electrode liquid storage device A1 - 2. By comparing the liquid levels of the electrolyte of the first electrode and the electrolyte of the second electrode, it can be determined whether there is a leakage between the first - electrode liquid storage device A1 - 1 and the second - electrode liquid storage device A1 - 2. The first preset value is the increase amount of the electrolyte of the first electrode in the first - electrode liquid storage device A1 - 1, and the second preset value is the decrease amount of the electrolyte of the second electrode in the second - electrode liquid storage device A1 - 2.

[0083] Specifically, if the liquid level of the first-pole electrolyte in the liquid storage device A1 when the flow battery is started this time is increased by a first preset value compared to the liquid level of the first-pole electrolyte in the liquid storage device A1 when the flow battery was shut down last time, and the liquid level of the second-pole electrolyte in the liquid storage device A1 when the flow battery is started this time is decreased by a second preset value compared to the liquid level of the second-pole electrolyte in the liquid storage device A1 when the flow battery was shut down last time, and the difference between the first preset value and the second preset value is less than a preset range, an internal leakage alarm signal is generated, and the flow battery is controlled to shut down. Exemplarily, if the first preset value is A cm, the second preset value is B cm, and the difference between A and B is less than the preset range, an internal leakage alarm signal is generated, and the flow battery is controlled to shut down. Through the internal leakage alarm signal, the alarm module 130 can generate an internal leakage alarm message according to the internal leakage alarm signal, so as to ensure that relevant personnel can receive the internal leakage alarm message in time and take corresponding measures to timely eliminate the leakage abnormality of the flow battery and improve the operation efficiency and management ability of the flow battery.

[0084] Optionally, generating a leakage alarm signal according to the difference between the liquid level of the electrolyte in the liquid storage device when the flow battery is started this time and the liquid level of the electrolyte in the liquid storage device when the flow battery was shut down last time includes:

[0085] If the difference between the liquid level of the first electrolyte in the liquid storage device when the flow battery is started this time and the liquid level of the first electrolyte in the liquid storage device when the flow battery was shut down last time is greater than a preset difference, an external leakage alarm signal is generated.

[0086] Wherein, the first electrolyte is the first-pole electrolyte or the second-pole electrolyte.

[0087] Specifically, if the difference between the liquid level of the first electrolyte in the liquid storage device A1 when the flow battery is started this time and the liquid level of the first electrolyte in the liquid storage device A1 when the flow battery was shut down last time is greater than the preset difference, that is, the liquid level of one of the first-pole liquid storage device A1-1 and the second-pole liquid storage device A1-2 changes during this start-up and the last shutdown, it indicates that external leakage occurs in the first-pole liquid storage device A1-1 and the second-pole liquid storage device A1-2, and thus an external leakage alarm signal is generated. By obtaining the liquid level of the electrolyte in the liquid storage device A1 when the flow battery is started this time and the liquid level of the electrolyte in the liquid storage device A1 when the flow battery was shut down last time, it is determined whether there is a leakage abnormality in the flow battery, which can improve the use safety of the flow battery and realize the protection of the flow battery.

[0088] Further, the method further includes:

[0089] Obtaining the vertex height of the heater in the liquid storage device; when the real-time liquid level is less than or equal to the vertex height, controlling the heater to stop working.

[0090] Wherein, refer to Figure 2, a liquid storage device A1 is provided with a heater A2 and a circulation pump A3, and the liquid level detection module 110, the heater A2 and the circulation pump A3 are all fixed in the liquid storage device A1 through mounting flanges

[0091] Specifically, by obtaining the vertex height of the heater A2 in the liquid storage device A1, when the real-time liquid level is less than or equal to the vertex height, the heater A2 is controlled to stop working, thereby preventing the heater from dry burning. In addition, when the real-time liquid level is less than or equal to the vertex height, a dry-burning prevention alarm can be issued through the alarm module 130, thereby greatly improving the use safety of the flow battery.

[0092] The embodiment of the present invention provides a liquid level monitoring and alarm method for a flow battery. This method obtains the real-time liquid level of the electrolyte in the liquid storage device, thereby timely discovering abnormal liquid levels and preventing potential hazards caused by insufficient or excessive liquid levels. It can effectively address the problem of insufficient liquid level of the electrolyte during the circulation and charge-discharge processes of the liquid storage tank, and improve the operation efficiency and management ability of the flow battery.

[0093] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it can also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A liquid level monitoring and alarm device for a flow battery, characterized in that: The device comprises a liquid level detection module, a data analysis module and an alarm module; The liquid level detection module is disposed in the liquid storage device of the flow battery, the liquid level detection module is connected to the data analysis module, and the liquid level detection module is used to monitor the real-time liquid level of the electrolyte in the liquid storage device and send the real-time liquid level to the data analysis module; The data analysis module is connected to the alarm module, and the data analysis module is used to generate different alarm signals and fluid replenishment prompt signals according to the size of the real-time liquid level, and send the alarm signal and the fluid replenishment prompt signal to the alarm module; The alarm module is used to generate corresponding alarm information according to the received alarm signal, and to generate corresponding fluid replenishment prompt information according to the received fluid replenishment prompt signal.

2. The liquid level monitoring and alarm device for a flow battery according to claim 1, characterized in that: The liquid level detection module is a float type liquid level sensor; the float type liquid level sensor is placed in the electrolyte in the liquid storage device.

3. The liquid level monitoring and alarm device for a flow battery according to claim 1, characterized in that: It also includes a monitoring and management module; There are 2N liquid level detection modules, which are respectively arranged in N liquid storage devices of the liquid flow battery; the 2N liquid level detection modules are connected to the first serial port through twisted pair cables, and the first serial port is connected to the data analysis module through an optical cable; wherein N is an arbitrary positive integer, and the liquid storage device includes a first liquid storage device and a second liquid storage device; The monitoring and management module is installed in the energy management system where the N flow batteries are located, and the monitoring and management module is communicatively connected with the alarm module and the data analysis module; the monitoring and management module is used to remotely receive the real-time liquid level, the alarm information and the refilling prompt information.

4. A liquid level monitoring and alarm method for a flow battery, characterized in that: The method is applied to the liquid level monitoring and alarm device of the flow battery according to any one of claims 1 to 3, and the method comprises: Obtaining the real-time liquid level of the electrolyte in the liquid storage device; Different alarm signals and fluid replenishment prompt signals are generated according to the size of the real-time liquid level, and the alarm information corresponding to the alarm signal is generated through the alarm module, and the fluid replenishment prompt information corresponding to the fluid replenishment prompt signal is generated through the alarm module.

5. The liquid level monitoring and alarm method for a flow battery according to claim 4, characterized in that: The generating of different alarm signals and fluid replenishment prompt signals according to the size of the real-time liquid level includes: When the real-time liquid level continues to decrease and the real-time liquid level is less than or equal to the first liquid replenishment preset value, a first liquid replenishment prompt signal is generated; When the real-time liquid level is less than or equal to a first alarm preset value, a first alarm signal is generated; When the real-time liquid level is less than or equal to a second alarm preset value, a second alarm signal is generated, and the flow battery is controlled to shut down; Among them, the first fluid infusion prompt signal is used to enable the alarm module to generate a fluid infusion prompt; the first fluid infusion preset value is greater than the first alarm preset value, and the first alarm preset value is greater than the second alarm preset value.

6. The liquid level monitoring and alarm method for a flow battery according to claim 5, characterized in that: The generating of different alarm signals and fluid replenishment prompt signals according to the size of the real-time liquid level also includes: When the real-time liquid level continues to rise and the real-time liquid level is greater than or equal to the second liquid replenishment preset value, a second liquid replenishment prompt signal is generated; When the real-time liquid level is greater than or equal to a third alarm preset value, a third alarm signal is generated; When the real-time liquid level is greater than or equal to a fourth alarm preset value, a fourth alarm signal is generated, and the flow battery is controlled to shut down; Among them, the second fluid infusion prompt signal is used to enable the alarm module to generate a fluid infusion completion prompt; the second fluid infusion preset value is greater than the first fluid infusion preset value, the third alarm preset value is greater than the second fluid infusion preset value, and the fourth alarm preset value is greater than the third alarm preset value.

7. The liquid level monitoring and alarm method for a flow battery according to claim 4, characterized in that: Also includes: Obtaining the liquid level of the electrolyte in the liquid storage device when the liquid flow battery is started this time and the liquid level of the electrolyte in the liquid storage device when the liquid flow battery was shut down last time; A leakage alarm signal is generated according to the difference between the liquid level of the electrolyte in the liquid storage device when the liquid flow battery is started this time and the liquid level of the electrolyte in the liquid storage device when the liquid flow battery was shut down last time.

8. The liquid level monitoring and alarm method for a flow battery according to claim 7, characterized in that: The generating of a leakage alarm signal according to the difference between the liquid level of the electrolyte in the liquid storage device when the liquid flow battery is started this time and the liquid level of the electrolyte in the liquid storage device when the liquid flow battery was shut down last time comprises: If the liquid level of the first-pole electrolyte in the liquid storage device when the liquid flow battery is started this time increases by a first preset value compared to the liquid level of the first-pole electrolyte in the liquid storage device when the liquid flow battery was shut down last time, and the liquid level of the second-pole electrolyte in the liquid storage device when the liquid flow battery is started this time decreases by a second preset value compared to the liquid level of the second-pole electrolyte in the liquid storage device when the liquid flow battery was shut down last time, and the difference between the first preset value and the second preset value is less than a preset range, an internal leakage alarm signal is generated, and the liquid flow battery is controlled to shut down.

9. The liquid level monitoring and alarm method for a flow battery according to claim 7, characterized in that: The generating of a leakage alarm signal according to the difference between the liquid level of the electrolyte in the liquid storage device when the liquid flow battery is started this time and the liquid level of the electrolyte in the liquid storage device when the liquid flow battery was shut down last time comprises: If the difference between the liquid level of the first electrolyte in the liquid storage device when the liquid flow battery is started this time and the liquid level of the first electrolyte in the liquid storage device when the liquid flow battery was shut down last time is greater than a preset difference, a liquid leakage alarm signal is generated.

10. The liquid level monitoring and alarm method for a flow battery according to claim 4, characterized in that: Also includes: Obtaining the vertex height of the heater in the liquid storage device; When the real-time liquid level is less than or equal to the peak height, the heater is controlled to stop working.

Images