A flow battery electrolyte tank system based on valve vacuuming and temperature control

Abstract

The present invention relates to the technical field of liquid flow battery electrolyte tanks, and specifically discloses a liquid flow battery electrolyte tank system based on valve vacuuming to control temperature, the system comprising: a vacuum pump exhaust rate confirmation module, a heating device power confirmation module, a theoretical air flow confirmation module, a three-way valve opening confirmation module and a database; the present invention automatically adjusts the temperature of the electrolyte tank according to temperature changes, and when the ambient temperature is lower than a set low temperature threshold, a vacuuming technology is used to achieve electrolyte insulation, thereby greatly reducing energy consumption; when the ambient temperature is higher than a set high temperature threshold, natural air convection is used to dissipate heat, thereby improving heat dissipation efficiency, improving stability and reliability of the liquid flow battery system, and conforming to the development trend of energy conservation and environmental protection. Whether it is low-temperature insulation or high-temperature heat dissipation, the influence of temperature on battery performance can be effectively reduced, and the charging and discharging efficiency and cycle life of the battery can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolyte tanks for liquid flow batteries, and in particular to a liquid flow battery electrolyte tank system for controlling temperature based on valve vacuuming. Background Art

[0002] As a highly efficient energy storage technology, flow batteries have broad application prospects in the fields of renewable energy grid connection, distributed power generation and backup power supply. However, their performance is greatly affected by the temperature of the electrolyte. In low temperature environments, the viscosity of the electrolyte increases and the ion diffusion rate decreases, resulting in increased internal resistance of the battery, decreased charging and discharging efficiency, and even possible solidification of the electrolyte, which seriously affects the normal operation of the battery. In high temperature environments, the side reactions of the electrolyte intensify, the cycle life of the battery is shortened, and the performance is also significantly affected.

[0003] At present, common electrolyte tank insulation measures mainly include installing insulation greenhouses on the outside of the tank and installing heating devices, but these methods have certain limitations when dealing with temperature changes in different seasons. For example, insulation materials may hinder the heat dissipation of the tank in summer, while heating devices need to consume a lot of energy to maintain the electrolyte temperature in winter, and it is difficult to accurately control the temperature within the optimal range. Therefore, it is of great significance to develop an effective method that can automatically adjust the temperature of the electrolyte tank according to seasonal changes.

[0004] For example, the Chinese patent publication number CN222051833U discloses an auxiliary heating device for a liquid flow battery and a liquid flow battery, wherein the auxiliary heating device includes a plurality of pipe interlayers and a heating pipe. The plurality of pipe interlayers are respectively arranged on the surfaces other than the top surface of the cathode electrolyte tank of the liquid flow battery. The heating pipe is laid in an S shape in each pipe interlayer and is connected to the anode electrolyte tank of the liquid flow battery. The heating pipes in each pipe interlayer are connected. The anode electrolyte in the anode electrolyte tank enters the pipe interlayer on the surface of the cathode electrolyte tank through the heating pipe, and the cathode electrolyte in the cathode electrolyte tank is auxiliary heated. The present application provides a pipe interlayer and a heating pipe, introduces the anode electrolyte into the surface of the cathode electrolyte tank through the heating pipe, and uses the residual temperature of the anode electrolyte to auxiliary heat the cathode electrolyte, thereby solving the technical problem in the prior art that the surface temperature of the cathode electrolyte heater cannot meet the temperature requirement of the cathode electrolyte.

[0005] For example, the Chinese patent publication number CN118983482A discloses an electrolyte cooling circulation heat dissipation system for electric energy storage. The battery in this scheme is a liquid flow battery assembly. By adopting a hydraulic battery, the first tank contains a positive electrolyte and the second tank contains a negative electrolyte. During operation, the first pump pumps the positive electrolyte in the first tank into the heat dissipation cavity plate, cools the positive electrolyte through the heat dissipation cavity plate, and then enters the first space through the second tube. Then, the positive electrolyte in the first space is pumped back to the first tank through the second pump and the third tube. The third pump pumps the negative electrolyte in the second tank into the heat dissipation cavity plate, cools the negative electrolyte through the heat dissipation cavity plate, and then enters the second space through the fifth tube. Then, the negative electrolyte in the second space is pumped back to the second tank through the fourth pump and the sixth tube to achieve cooling and heat dissipation of the positive electrolyte and the negative electrolyte during the flow process.

[0006] The following problems still exist in the prior art: 1. The prior art utilizes the residual temperature of the anode electrolyte to assist in heating the cathode electrolyte to meet the heating demand of the electrolyte, but does not use vacuum technology to achieve electrolyte insulation. On the one hand, it simply relies on the residual temperature of the anode electrolyte, and the heating effect is greatly affected by the temperature fluctuation of the anode electrolyte itself, and the stability is poor. It is difficult to maintain a suitable electrolyte temperature when the external temperature changes drastically. On the other hand, the lack of vacuum makes it difficult to effectively block the heat exchange between the tank and the outside world, and the heat is easily dissipated. It is impossible to ensure that the electrolyte temperature is always in the optimal working range, which limits the wide application of liquid flow batteries in different environments and greatly increases energy consumption.

[0007] 2. The existing technology cools and dissipates heat during the flow of positive and negative electrolytes, but does not utilize natural air convection to dissipate heat. It only relies on the flow of the electrolyte itself to dissipate heat. The heat dissipation path is single and the heat dissipation efficiency is limited. It is difficult to quickly and effectively reduce the electrolyte temperature in a high temperature environment, which affects the stability and reliability of the liquid flow battery system and does not conform to the development trend of energy conservation and environmental protection. Summary of the invention

[0008] In view of this, in order to solve the problems raised in the above background technology, a flow battery electrolyte tank system based on valve vacuuming and temperature control is proposed.

[0009] The purpose of the present invention can be achieved through the following technical solutions: The present invention provides a liquid flow battery electrolyte tank system based on valve vacuum pumping to control temperature, including: a vacuum pump pumping rate confirmation module, which is used to obtain the ambient temperature of the current environment of the target electrolyte storage tank. When the ambient temperature is lower than the set low temperature threshold, the temperature adjustment program is started to extract the historical pumping rate of the target vacuum circulation pump, the tank volume of the target electrolyte storage tank, the current vacuum degree, the target vacuum degree and the pumping time, and confirm the current pumping rate of the target vacuum circulation pump.

[0010] The heating device power confirmation module is used to collect thermal images of the target electrolyte storage tank during the vacuum pumping process, extract the tank wall thickness and basic heating information, confirm the temperature inside the tank, and when the temperature inside the tank is within the electrolyte solidification point range, confirm the power of the auxiliary heating device outside the tank.

[0011] The theoretical air flow confirmation module is used to switch to the heat dissipation mode when the ambient temperature is higher than the set high temperature threshold, confirm the current tank temperature, extract the set optimal upper limit temperature, and confirm the adjusted theoretical air flow.

[0012] The three-way valve opening confirmation module is used to evaluate the control accuracy and confirm the opening of the target three-way valve according to the adjusted theoretical air flow and the adjustment information of the target three-way valve.

[0013] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: (1) The present invention automatically adjusts the temperature of the electrolyte tank according to temperature changes and accurately controls it within the optimal operating temperature range of the liquid flow battery. Whether it is low-temperature insulation or high-temperature heat dissipation, it can effectively reduce the impact of temperature on battery performance and improve the battery's charge and discharge efficiency and cycle life.

[0014] (2) When the ambient temperature is lower than the set low temperature threshold, the present invention confirms the current pumping rate of the target vacuum circulation pump and uses vacuum pumping technology to achieve electrolyte insulation. The vacuum pumping effectively blocks the heat exchange between the tank and the outside world, and the heat is not easily dissipated, thereby ensuring that the electrolyte temperature is always within the optimal working range, avoiding restrictions on the wide application of liquid flow batteries in different environments, and greatly reducing energy consumption.

[0015] (3) When the ambient temperature is higher than the set high temperature threshold, the present invention utilizes natural air convection to dissipate heat, thereby improving the heat dissipation efficiency, quickly and effectively reducing the electrolyte temperature in a high temperature environment, avoiding affecting the stability and reliability of the liquid flow battery system, and complying with the development trend of energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the system module structure connection of the present invention.

[0018] Figure 2 It is a first stereoscopic view of the electrolyte tank system of the liquid flow battery of the present invention.

[0019] Figure 3 It is a second stereoscopic view of the electrolyte tank system of the liquid flow battery of the present invention.

[0020] Figure 4 It is a cross-sectional perspective view of the electrolyte storage tank of the present invention.

[0021] Figure 5 It is a cross-sectional stereoscopic view of the three-way valve of the present invention.

[0022] Description of the drawings: 1- stack system, 2- human-machine interface (HMI), 3- electrolyte upper circulation pipeline, 4- electrolyte storage tank, 5- electrolyte circulation pump, 6- electrolyte lower circulation pipeline, 7- vacuum circulation pump, 8- vacuum buffer tank, 9- three-way valve, 10- electromagnetic valve control switch, 11- air filter, 12- air compressor, 13- electrolyte storage tank outer layer, 14- electrolyte storage tank inner layer, 15- high-precision temperature sensor, 16- vacuum detector, 17- air flow sensor. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1 As shown, the present invention provides a flow battery electrolyte tank system based on valve vacuum pumping temperature control, including: a vacuum pump exhaust rate confirmation module, a heating device power confirmation module, a theoretical air flow confirmation module and a three-way valve opening confirmation module.

[0025] It should be noted that the present invention also includes a database for storing the pumping rate required to compensate for the unit working accuracy deviation of the target vacuum circulation pump, the heat loss corresponding to the unit tank wall thickness, the heating efficiency of the auxiliary heating device, the air flow change corresponding to the unit temperature deviation, the air flow required to compensate for the unit control accuracy deviation, and the flow characteristic curve of the target three-way valve.

[0026] The vacuum pump exhaust rate confirmation module is connected to the heating device power confirmation module, the theoretical air flow confirmation module is connected to the three-way valve opening confirmation module, and the vacuum pump exhaust rate confirmation module, the heating device power confirmation module, the theoretical air flow confirmation module and the three-way valve opening confirmation module are all connected to the database.

[0027] See also Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, in a specific embodiment of the present invention, the structure of the target electrolyte storage tank includes but is not limited to a battery stack system, a human-machine interface (HMI), an electrolyte upper circulation pipeline, an electrolyte storage tank, an electrolyte circulation pump, an electrolyte lower circulation pipeline, a vacuum circulation pump, a vacuum buffer tank, a three-way valve, an electromagnetic valve control switch, an air filter, an air compressor, an electrolyte storage tank outer layer, an electrolyte storage tank inner layer, a high-precision temperature sensor, a vacuum detector and an air flow sensor.

[0028] The vacuum pump exhaust rate confirmation module is used to obtain the ambient temperature of the current environment of the target electrolyte storage tank. When the ambient temperature is lower than the set low temperature threshold, the temperature adjustment program is started to extract the historical exhaust rate of the target vacuum circulation pump, the tank volume of the target electrolyte storage tank, the current vacuum degree, the target vacuum degree and the exhaust time, and confirm the current exhaust rate of the target vacuum circulation pump.

[0029] In a specific embodiment of the present invention, the specific value of the set low temperature threshold is -5°C.

[0030] It should be noted that the ambient temperature of the current environment of the target electrolyte storage tank is collected by a temperature sensor installed in the environment, the tank volume is extracted from the basic information of the target electrolyte storage tank, the current vacuum degree is collected by a vacuum detector, and the target vacuum degree and pumping time are both extracted from the standardized requirements of the temperature control program.

[0031] It should also be noted that the specific process of starting the temperature adjustment program is: first, close the connection port between the valve and the air supply system, start the target vacuum circulation pump, set the pumping rate of the target vacuum circulation pump to the current pumping rate, and evacuate the space at the connection between the valve and the tank body through the vacuum pipe. During the vacuum pumping process, use a vacuum detector to monitor the vacuum degree in real time. When the target vacuum degree is reached, the target vacuum circulation pump stops working and the valve remains closed. At the same time, during the vacuum pumping process, the temperature inside the target electrolyte storage tank is continuously monitored. If the temperature inside the tank is within the electrolyte solidification point, start the auxiliary heating device outside the tank body, set the power of the auxiliary heating device, and achieve precise temperature control through the temperature sensor feedback signal during the heating process.

[0032] In a specific embodiment of the present invention, the historical pumping rate includes the set pumping rate and the actual pumping rate in each historical operation.

[0033] It should be noted that the set pumping rate and the actual pumping rate in each historical operation are extracted from the background work manual of the target vacuum circulation pump.

[0034] In a specific embodiment of the present invention, the specific process of confirming the current pumping rate of the target vacuum circulating pump is: extracting the set pumping rate and the actual pumping rate in each historical operation from the historical pumping rate of the target vacuum circulating pump, and analyzing the working accuracy of the target vacuum circulating pump accordingly. .

[0035] It should be noted that the specific method of analyzing the working accuracy of the target vacuum circulation pump is: subtract the set pumping rate and the actual pumping rate in each historical operation of the target vacuum circulation pump to obtain the pumping rate deviation in each historical operation of the target vacuum circulation pump, and calculate the average value thereof to obtain the average pumping rate deviation of the target vacuum circulation pump, which is recorded as .

[0036] Calculate the operating accuracy of the target vacuum circulation pump , ,in, Indicates the pumping rate deviation from the set reference.

[0037] It should be noted that the set reference pumping rate deviation is obtained according to the design specifications of the target vacuum circulating pump and can be extracted from the relevant technical documents of the target vacuum circulating pump.

[0038] It should also be noted that the calculation and derivation of the working accuracy of the target vacuum circulation pump is based on the concept of relative deviation, which is often used to measure the degree of deviation between an actual value and an expected value. In statistics, relative deviation is usually used to measure the difference between an actual value and an expected value. The use of this formula can intuitively reflect the working accuracy of the target vacuum circulation pump. The larger the value, the greater the working accuracy of the target vacuum circulation pump, and the smaller the value, the smaller the working accuracy of the target vacuum circulation pump. At the same time, the formula is simple and easy to understand, the calculation process is clear and concise, and it is convenient for system automation processing, and the results are also easy to understand and explain.

[0039] Calculate the theoretical pumping rate of the target vacuum circulation pump based on the tank volume, current vacuum degree, target vacuum degree and pumping time of the target electrolyte storage tank .

[0040] It should be noted that the method for calculating the theoretical pumping rate of the target vacuum circulation pump is: the tank volume of the target electrolyte storage tank, the current vacuum degree, the target vacuum degree and the pumping time are recorded as , , and .

[0041] Calculate the theoretical pumping rate of the target vacuum circulation pump , .

[0042] For example, Table 1 below lists some data for calculating the theoretical pumping rate of the target vacuum circulation pump.

[0043] Table 1 shows some data:

[0044]

[0045] The pumping rate required to compensate for the unit working accuracy deviation of the target vacuum circulation pump is extracted from the database and recorded as .

[0046] Calculate the current pumping rate of the target vacuum circulation pump , ,in, Indicates the vacuum pump operating accuracy of the setting reference.

[0047] The heating device power confirmation module is used to collect thermal images of the target electrolyte storage tank during the vacuum pumping process, extract the tank wall thickness and basic heating information, confirm the temperature inside the tank, and when the temperature inside the tank is within the electrolyte solidification point range, confirm the power of the auxiliary heating device outside the tank.

[0048] It should be noted that the thermal image of the target electrolyte storage tank during the vacuuming process is acquired by a thermal imaging detector, and the tank wall thickness is extracted from the basic information of the target electrolyte storage tank.

[0049] In a specific embodiment of the present invention, the specific process of confirming the temperature in the tank is as follows: the temperature values ​​of each temperature distribution area are located from the thermal image of the target electrolyte storage tank during the vacuuming process, and the average value is calculated to obtain the temperature average value corresponding to the target electrolyte storage tank, which is recorded as .

[0050] The heat loss corresponding to the unit tank wall thickness is extracted from the database and recorded as .

[0051] The tank wall thickness is recorded as .

[0052] Check the temperature inside the tank , .

[0053] In a specific embodiment of the present invention, the basic heating information includes the total heat transfer coefficient, the tank surface area and the safety factor.

[0054] It should be noted that the total heat transfer coefficient, tank surface area and safety factor are all extracted from the basic information of the target electrolyte storage tank.

[0055] In a specific embodiment of the present invention, the specific value range of the freezing point of the electrolyte is -20°C to -30°C.

[0056] In a specific embodiment of the present invention, the specific process of confirming the power of the auxiliary heating device outside the tank body is: extracting the total heat transfer coefficient, the surface area of ​​the tank body and the safety factor from the basic heating information.

[0057] The tank heat dissipation rate of the target electrolyte storage tank is calculated based on the total heat transfer coefficient, tank surface area, tank temperature and the current ambient temperature of the environment.

[0058] It should be noted that the specific method for calculating the heat dissipation rate of the target electrolyte storage tank is: the total heat transfer coefficient, the surface area of ​​the tank, the temperature inside the tank and the ambient temperature of the current environment are recorded as , , and .

[0059] Calculate the heat dissipation rate of the target electrolyte storage tank , .

[0060] The required heating amount is calculated based on the heat dissipation rate and safety factor of the target electrolyte storage tank, and the power of the auxiliary heating device outside the tank is calculated based on the required heating amount and the heating efficiency of the auxiliary heating device stored in the database.

[0061] It should be noted that the method for calculating the required heating amount is: the safety factor of the target electrolyte storage tank is recorded as .

[0062] Calculate the required heating , .

[0063] It should be noted that the method for calculating the power of the auxiliary heating device outside the tank body is: the heating efficiency of the auxiliary heating device stored in the database is recorded as .

[0064] Calculate the power of the auxiliary heating device outside the tank , .

[0065] The embodiment of the present invention confirms the current pumping rate of the target vacuum circulation pump when the ambient temperature is lower than the set low temperature threshold, and adopts the vacuum pumping technology to achieve electrolyte insulation. The vacuum pumping effectively blocks the heat exchange between the tank body and the outside world, and the heat is not easily dissipated, thereby ensuring that the electrolyte temperature is always in the optimal working range, avoiding restrictions on the wide application of liquid flow batteries in different environments, and greatly reducing energy consumption.

[0066] The theoretical air flow confirmation module is used to switch to the heat dissipation mode when the ambient temperature is higher than the set high temperature threshold, confirm the current temperature in the tank, extract the set optimal upper limit temperature, and confirm the adjusted theoretical air flow.

[0067] It should be noted that the current tank temperature is consistent with the method for confirming the tank temperature mentioned above, which will not be repeated here.

[0068] In a specific embodiment of the present invention, the set high temperature threshold value is 30°C, and the set optimal upper limit temperature value is 35°C.

[0069] In a specific embodiment of the present invention, the specific process of confirming the adjusted theoretical air flow rate is as follows: the current tank temperature and the set optimal upper limit temperature are recorded as as well as .

[0070] when The adjusted theoretical air flow can be calculated by the following formula: ,in, represents the adjusted theoretical air flow, Indicates the reference air flow rate, Indicates the change in air flow rate corresponding to the unit temperature deviation stored in the database.

[0071] when The adjusted theoretical air flow can be calculated by the following formula: ,in, Indicates the allowable temperature difference when the current tank temperature is close to the optimal upper limit temperature.

[0072] The three-way valve opening confirmation module is used to evaluate the control accuracy and confirm the opening of the target three-way valve according to the adjusted theoretical air flow and the regulation information of the target three-way valve.

[0073] In a specific embodiment of the present invention, the adjustment information includes the target air flow corresponding to each adjustment, the time point corresponding to receiving the control signal, the time point corresponding to reaching the target air flow and the actual air flow corresponding to each monitoring time point.

[0074] It should be noted that the target air flow corresponding to each adjustment is extracted from the adjustment background of the target three-way valve, the actual air flow corresponding to each monitoring time point is collected by an air flow sensor, and the time point corresponding to the receipt of the control signal and the time point corresponding to the reaching of the target air flow corresponding to each adjustment are both extracted from the adjustment background of the target three-way valve.

[0075] In a specific embodiment of the present invention, the specific process of evaluating the control accuracy of the target three-way valve is: extracting the target air flow corresponding to each adjustment, the time point corresponding to the receipt of the control signal, the time point corresponding to the target air flow, and the actual air flow corresponding to each monitoring time point from the adjustment information of the target three-way valve, and calculating the response timeliness and flow control stability of the target three-way valve respectively.

[0076] It should be noted that the specific process of calculating the response time of the target three-way valve is as follows: the time point corresponding to the receiving of the control signal corresponding to each adjustment of the target three-way valve is compared with the time point corresponding to the reaching of the target air flow, and the response time corresponding to each adjustment of the target three-way valve is obtained, and the maximum value is extracted as the response time of the target three-way valve, and recorded as .

[0077] Calculate the response time of the target three-way valve , ,in, Indicates the allowed valve response time.

[0078] It should be noted that in the chemical industry, energy storage and other industries involving flow batteries, there are standards specifically for the response performance of fluid control equipment. For example, the relevant standards of the International Organization for Standardization (ISO) stipulate the maximum allowable time for valves to open or close under specific pressure and flow conditions. For flow battery electrolyte tank systems, if similar industry standards are adopted, the permitted valve response time is set within 2 seconds.

[0079] It should also be noted that the derivation of the formula for the response timeliness of the target three-way valve is also based on the concept of relative deviation. The use of this formula can intuitively reflect the response timeliness of the target three-way valve. The larger the value, the greater the response timeliness of the target three-way valve, and the smaller the value, the smaller the response timeliness of the target three-way valve.

[0080] It should be noted that the specific method of calculating the flow control stability of the target three-way valve is: subtract the target air flow corresponding to each adjustment of the target three-way valve from the actual air flow corresponding to each monitoring time point, and obtain the air flow deviation at each monitoring time point corresponding to each adjustment of the target three-way valve.

[0081] With the monitoring time point as the horizontal coordinate and the air flow deviation as the vertical coordinate, the air flow deviation curve corresponding to each adjustment of the target three-way valve is constructed, and the slope of the curve is located from the curve, which is used as the air flow deviation change rate corresponding to each adjustment of the target three-way valve, recorded as ,in, Indicates the number of each adjustment. .

[0082] Calculate the flow control stability of the target three-way valve , ,in, Indicates the rate of change of the air flow deviation of the set reference. Indicates the number of adjustments. Represents a natural constant.

[0083] It should also be noted that the concept of deriving the formula for the flow control stability of the target three-way valve is: by constructing a curve with the monitoring time point as the horizontal coordinate and the air flow deviation as the vertical coordinate, it can intuitively reflect the changing trend of the air flow deviation of the target three-way valve over time during each adjustment process. The benefits of this curve construction method include: 1) Visual analysis: The curve can be used to intuitively observe the changing pattern of the flow deviation, which is convenient for quickly identifying abnormal fluctuations or trends. 2) Accurate positioning of the slope: The slope of the curve can be used to accurately calculate the rate of change of the air flow deviation and quantify the dynamic performance of the flow control. 3) Historical data comparison: Curves with different adjustment times can be compared horizontally to evaluate the stability of the valve under different working conditions. 4) Trend prediction: Based on the trend of curve changes, future changes in flow deviation can be predicted to provide a basis for optimizing the control strategy. At the same time, in order to map the flow control stability to the range of (0, 1], the natural exponential function is used to index the average relative deviation. The smaller the average relative deviation, The closer it is to 1, the more stable the flow control is. The closer it is to 0, the more unstable the flow control is.

[0084] Comprehensively evaluate the control accuracy of the target three-way valve based on its response timeliness and flow control stability. .

[0085] It should be noted that the calculation formula for the control accuracy of the comprehensive evaluation target three-way valve is: ,in, and They represent the weights of response timeliness and flow control stability corresponding to control accuracy assessment, .

[0086] In a specific embodiment of the present invention, The setting value of is 0.5. The setting value is 0.5. When comprehensively evaluating the control accuracy of the target three-way valve, both response timeliness and flow control stability are crucial, and it is difficult to simply determine which is more important. Response timeliness ensures that the regulating valve can quickly respond to the control system instructions. When the ambient temperature changes and the heat dissipation or insulation strategy needs to be adjusted, the air flow is adjusted in time so that the electrolyte temperature can quickly approach the target value. The flow control stability ensures that the flow fluctuation is small during the adjustment process, maintains a stable heat dissipation or insulation effect, and avoids large fluctuations in the electrolyte temperature. The two complement each other and jointly ensure that the flow control valve can achieve precise control, maintain the stability of the electrolyte temperature, and improve the performance of the flow battery.

[0087] In a specific embodiment of the present invention, the specific process of confirming the opening of the target three-way valve is: extracting the required compensation air flow corresponding to the unit control accuracy deviation from the database and recording it as .

[0088] Confirm the optimal air flow rate for the target electrolyte storage tank , ,in, Indicates the control accuracy of the setting reference.

[0089] The optimal air flow corresponding to the target electrolyte storage tank is substituted into the flow characteristic curve of the target three-way valve stored in the database, and the opening of the target three-way valve is located from the curve.

[0090] The embodiments of the present invention utilize natural air convection to dissipate heat when the ambient temperature is higher than a set high temperature threshold, thereby improving heat dissipation efficiency, quickly and effectively reducing the electrolyte temperature in a high temperature environment, and avoiding affecting the stability and reliability of the liquid flow battery system, which is in line with the development trend of energy conservation and environmental protection.

[0091] It should also be noted that the data sources in the database of this embodiment are shown in Table 2.

[0092] Table 2 Data sources in the database:

[0093]

[0094] The embodiment of the present invention automatically adjusts the temperature of the electrolyte tank according to temperature changes and accurately controls it within the optimal operating temperature range of the liquid flow battery. Whether it is low-temperature insulation or high-temperature heat dissipation, it can effectively reduce the impact of temperature on battery performance and improve the battery's charge and discharge efficiency and cycle life.

[0095] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A flow battery electrolyte tank system based on valve vacuuming and temperature control, the target electrolyte storage tank includes a battery stack system, a human-machine interface, an electrolyte upper circulation pipeline, an electrolyte storage tank, an electrolyte circulation pump, an electrolyte lower circulation pipeline, a vacuum circulation pump, a vacuum buffer tank, a three-way valve, an electromagnetic valve control switch, an air filter, an air compressor, an electrolyte storage tank outer layer, an electrolyte storage tank inner layer, a high-precision temperature sensor, a vacuum detector and an air flow sensor, and the three pipelines of the three-way valve are respectively connected to the air compressor, the electrolyte storage tank and the vacuum circulation pump; it is characterized in that The flow battery electrolyte tank system also includes: The vacuum pump exhaust rate confirmation module is used to obtain the ambient temperature of the current environment of the target electrolyte storage tank. When the ambient temperature is lower than the set low temperature threshold, the temperature adjustment program is started to extract the historical exhaust rate of the target vacuum circulation pump, the tank volume of the target electrolyte storage tank, the current vacuum degree, the target vacuum degree and the exhaust time, and confirm the current exhaust rate of the target vacuum circulation pump. The specific process is as follows: Extract the set pumping rate and actual pumping rate in each historical operation from the historical pumping rate of the target vacuum circulation pump, and analyze the working accuracy of the target vacuum circulation pump based on this. ; Calculate the theoretical pumping rate of the target vacuum circulation pump based on the tank volume, current vacuum degree, target vacuum degree and pumping time of the target electrolyte storage tank ; The pumping rate required to compensate for the unit working accuracy deviation of the target vacuum circulation pump is extracted from the database and recorded as ; Calculate the current pumping rate of the target vacuum circulation pump , ,in, Indicates the working accuracy of the vacuum pump for setting reference; The heating device power confirmation module is used to collect the thermal image of the target electrolyte storage tank during the vacuuming process, extract the tank wall thickness and basic heating information, confirm the temperature inside the tank, and when the temperature inside the tank is within the electrolyte solidification point range, confirm the power of the auxiliary heating device outside the tank; Theoretical air flow confirmation module is used to switch to the heat dissipation mode when the ambient temperature is higher than the set high temperature threshold, confirm the current tank temperature, extract the set optimal upper limit temperature, and confirm the adjusted theoretical air flow; The three-way valve opening confirmation module is used to evaluate the control accuracy of the target three-way valve based on the adjusted theoretical air flow and the adjustment information of the target three-way valve. , confirm the opening of the target three-way valve; The evaluation method is as follows: extract the target air flow corresponding to each adjustment, the time point corresponding to the receipt of the control signal, the time point corresponding to the target air flow, and the actual air flow corresponding to each monitoring time point from the adjustment information of the target three-way valve, calculate the response timeliness and flow control stability of the target three-way valve respectively, and comprehensively evaluate the response timeliness and flow control stability based on the response timeliness and flow control stability. ; The specific process of confirming the opening of the target three-way valve is as follows: The required compensation air flow corresponding to the unit control accuracy deviation is extracted from the database and recorded as ; Confirm the optimal air flow rate for the target electrolyte storage tank , ,in, Indicates the control accuracy of the set reference; Substituting the optimal air flow rate corresponding to the target electrolyte storage tank into the flow characteristic curve of the target three-way valve stored in the database, and locating the opening of the target three-way valve from the curve; The specific process of starting the temperature adjustment program is: closing the connection port between the three-way valve and the air supply system, starting the target vacuum circulation pump, and evacuating the space at the connection between the three-way valve and the tank body. When the target vacuum degree is reached, the target vacuum circulation pump stops working and the three-way valve remains closed.

2. A flow battery electrolyte tank system based on valve vacuuming and temperature control according to claim 1, characterized in that: The historical pumping rate includes the set pumping rate and the actual pumping rate in each historical operation.

3. A flow battery electrolyte tank system based on valve vacuuming and temperature control according to claim 1, characterized in that: The specific process of confirming the temperature in the tank is as follows: The temperature values ​​of each temperature distribution area are located from the thermal image of the target electrolyte storage tank during the vacuuming process, and the average value is calculated to obtain the temperature average value corresponding to the target electrolyte storage tank, which is recorded as ; The heat loss corresponding to the unit tank wall thickness is extracted from the database and recorded as ; The tank wall thickness is recorded as ; Check the temperature inside the tank , .

4. A flow battery electrolyte tank system based on valve vacuuming and temperature control according to claim 3, characterized in that: The basic heating information includes the total heat transfer coefficient, the tank surface area and the safety factor.

5. A flow battery electrolyte tank system based on valve vacuuming and temperature control according to claim 4, characterized in that: The specific process of confirming the power of the auxiliary heating device outside the tank body is as follows: Extract the total heat transfer coefficient, tank surface area and safety factor from the basic heating information; Calculate the heat dissipation rate of the target electrolyte storage tank based on the total heat transfer coefficient, the tank surface area, the temperature inside the tank, and the ambient temperature of the current environment; The required heating amount is calculated based on the heat dissipation rate and safety factor of the target electrolyte storage tank, and the power of the auxiliary heating device outside the tank is calculated based on the required heating amount and the heating efficiency of the auxiliary heating device stored in the database.

6. A flow battery electrolyte tank system based on valve vacuuming and temperature control according to claim 1, characterized in that: The specific process of confirming the adjusted theoretical air flow is as follows: The current tank temperature and the set optimal upper limit temperature are recorded as as well as ; when The adjusted theoretical air flow can be calculated by the following formula: ,in, represents the adjusted theoretical air flow, Indicates the reference air flow rate, Indicates the change in air flow corresponding to the unit temperature deviation stored in the database; when The adjusted theoretical air flow can be calculated by the following formula: ,in, Indicates the allowable temperature difference when the current tank temperature is close to the optimal upper limit temperature.

7. A flow battery electrolyte tank system based on valve vacuuming and temperature control according to claim 6, characterized in that: The adjustment information includes the target air flow corresponding to each adjustment, the time point corresponding to receiving the control signal, the time point corresponding to reaching the target air flow, and the actual air flow corresponding to each monitoring time point.

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