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CN-122025708-A - Electrolyte temperature maintaining system and method

CN122025708ACN 122025708 ACN122025708 ACN 122025708ACN-122025708-A

Abstract

The invention belongs to the technical field of electrolyte temperature management, and discloses an electrolyte temperature maintaining system and method. The electrochemical equipment system is a main circulation loop, comprises an electrolyte storage tank and the like, the circulation pump drives electrolyte to flow, the electrolyte flows through a wall-type heat exchanger after being reacted by the electrochemical equipment, the heat exchange system is a secondary loop, a compressor and other components enable a refrigerant to circulate and exchange heat with the electrolyte, the electric auxiliary heating system uses a self-temperature-limiting heat tracing belt to heat and preserve heat of the electrolyte, and the control system receives a signal of a temperature sensor and controls the heat exchange and the start and stop of the electric auxiliary heating system after comparing the signal with a preset range. The method comprises the steps of starting an electrochemical equipment system, collecting signals by a temperature sensor, starting a heat exchange system when the temperature exceeds the upper limit after the comparison of a control system, and starting an electric auxiliary heating system when the temperature is lower than the lower limit, so that the temperature of electrolyte is maintained in an optimal range, and the stable operation of the electrochemical equipment is ensured.

Inventors

  • TANG JIANJUN
  • YU JIALU
  • WEI XUEWEN
  • DENG FUBIN
  • SHANG SEN
  • XU HUI
  • WANG HONGYU
  • JIANG SHAN
  • DU RONGRONG

Assignees

  • 三峡新能源吉木萨尔发电有限公司

Dates

Publication Date
20260512
Application Date
20260116

Claims (10)

  1. 1. The utility model provides an electrolyte temperature maintenance system, a serial communication port, including electrochemical device system (1), heat transfer system (2), electricity assist hot system (3) and control system (4), electrochemical device system (1) are piping connection with heat transfer system (2), electrochemical device system (1) are mechanical connection with electricity assist hot system (3), electrochemical device system (1) are used for the circulation of electrolyte itself, be main circulation loop (5), electrolyte storage tank (8) has been connected gradually on main circulation loop (5), temperature sensor (11), circulating pump (10), electrochemical device, heat transfer system (2) are used for carrying out secondary circuit (6) of heat exchange to main circulation loop, compressor (13) have been connected gradually on secondary circuit (6), dividing wall type heat exchanger (7), condenser (12), expansion valve (14), electrolyte storage tank (8) are equipped with electricity and assist hot system (3), control system (4) are electric auxiliary hot system (2), electricity is connected with heat transfer system (3), electrochemical device, temperature sensor (11) are electric.
  2. 2. Electrolyte temperature maintenance system according to claim 1, characterized in that the electrochemical device is a galvanic pile (9).
  3. 3. The electrolyte temperature maintenance system according to claim 2, wherein the circulation pump (10) is disposed at an outlet position of the electrolyte storage tank (8), the electrolyte flows through the circulation pump (10) into the dividing wall type heat exchanger (7), the temperature sensor (11) is disposed on a pipeline in front of the electric pile (9), and the electrolyte flows back into the electrolyte storage tank (8) through the electric pile (9).
  4. 4. The electrolyte temperature maintenance system according to claim 1, wherein the flow channel of the dividing wall type heat exchanger (7) is a dividing wall type heat exchanger refrigerant flow channel (15) which is designed as a serpentine flow channel with multiple turns.
  5. 5. Electrolyte temperature maintenance system according to claim 1, characterized in that the electric auxiliary heating system (3) is a heat tracing band (16) tightly laid on the outer wall of the electrolyte tank (8).
  6. 6. The electrolyte temperature maintenance system according to claim 5, wherein the heat tracing band (16) is a self-limiting temperature tracing band.
  7. 7. Electrolyte temperature maintenance system according to claim 1, characterized in that the control system (4) is a Programmable Logic Controller (PLC) control system or a single chip microcomputer control system.
  8. 8. An electrolyte temperature maintaining method, characterized by being applied to the electrolyte temperature maintaining system according to any one of claims 1 to 7, comprising the steps of: Step S1, starting an electrochemical equipment system (1), and driving electrolyte to flow in a main circulation loop (5) by a circulation pump (10), wherein the electrolyte flows through charge-discharge reaction of the electrochemical equipment to generate reaction heat; s2, a temperature sensor (11) collects electrolyte temperature signals in real time and transmits the electrolyte temperature signals to a control system (4); Step S3, the control system (4) compares the detected temperature with a preset optimal operation temperature range of the electrolyte: s4, if the temperature of the collected electrolyte is higher than the upper limit temperature set by the heat exchange system (2), the control system (4) controls the heat exchange system (2) to operate, a compressor (13) compresses a refrigerant to form gas to a condenser (12), the refrigerant is condensed into liquid in the condenser (12) to be throttled to a runner of the dividing wall type heat exchanger (7), the refrigerant changes phase in the runner, and performs heat exchange with the electrolyte to reduce the temperature of the electrolyte; And S5, if the acquired electrolyte temperature is lower than the lower limit temperature set by the electric auxiliary heating system (3), the control system (4) controls the electric auxiliary heating system (3) to operate, and the electric auxiliary heating system (3) provides compensation heat for the electrolyte so as to increase the electrolyte temperature.
  9. 9. The electrolyte temperature maintenance method according to claim 8, wherein the control system (4) controls the heat exchanging system (2) and the electric auxiliary heating system (3) to stop operating when the electrolyte temperature is within a preset optimum operation temperature range of the electrolyte.
  10. 10. The electrolyte temperature maintenance method according to claim 8, wherein the operating states of the heat exchange system (2) and the electric auxiliary heating system (3) are monitored in real time during the system operation, and if a fault occurs, the control system (4) sends out an alarm signal.

Description

Electrolyte temperature maintaining system and method Technical Field The invention belongs to the technical field of electrolyte temperature management, and particularly relates to an electrolyte temperature maintaining system and method. Background Flow batteries are a novel large-scale energy storage technology and have extremely important roles in the energy field nowadays. With the increasing global demand for clean energy, the proportion of renewable energy such as solar energy, wind energy and the like to generate electricity is continuously increased. However, these renewable energy sources have intermittent and fluctuating characteristics, and their generated power can fluctuate greatly with changes in natural conditions, which presents a great challenge for stable operation of the power grid. Flow batteries, by virtue of their unique advantages, are one of the ideal options for solving the renewable energy storage problem. The energy and power can be designed independently, namely the energy storage capacity of the battery can be enlarged by increasing the amount of electrolyte, and the output power is determined by the size of the electric pile. In addition, the flow battery has the advantages of long cycle life, high safety, environmental friendliness and the like. For example, the cycle life of the all-vanadium redox flow battery can reach tens of thousands times, and harmful substances can not be generated in the charging and discharging processes, so that the environmental impact is small. Therefore, the flow battery has wide application prospect in the fields of power grid peak regulation, renewable energy grid connection, distributed energy systems and the like. The electrolyte temperature has a great influence on the performance of the flow battery, and is mainly characterized in the following aspects: Impact on battery efficiency Electrolyte temperature is one of the key factors affecting flow battery performance. In a proper temperature range, the charge and discharge efficiency of the battery is high. When the temperature of the electrolyte is too low, the viscosity of the electrolyte increases, the diffusion rate of ions in the electrolyte is slowed down, and the internal resistance of the battery increases, thereby reducing the charge and discharge efficiency of the battery. For example, in a low temperature environment, the voltage efficiency of an all-vanadium redox flow battery may be significantly reduced, thereby affecting the energy conversion efficiency of the entire battery system. Conversely, when the electrolyte temperature is too high, a series of adverse effects are caused at the same time, although the diffusion rate of ions is accelerated. The high temperature accelerates the decomposition of active materials in the electrolyte and the occurrence of side reactions, resulting in an accelerated capacity fade of the battery, and the charge and discharge efficiency is also affected. In addition, the high temperature may also age the sealing material inside the battery, increasing the risk of electrolyte leakage, further reducing the performance and safety of the battery. (II) Effect on battery life Electrolyte temperature has a direct and profound effect on the life of flow batteries. Various components of the battery can be damaged to varying degrees over time in an unsuitable temperature environment. Under the low temperature condition, the electrode material inside the battery may shrink, resulting in poor contact between the electrode and the electrolyte, and affecting the charge and discharge performance of the battery. Meanwhile, the low temperature can freeze water in the electrolyte, and damage the structure of the battery. And under the high-temperature environment, the chemical reaction rate inside the battery is accelerated, the loss of active substances is increased, and the corrosion of electrode materials is also increased. These factors lead to a gradual decrease in the capacity of the battery and a reduction in the cycle life. Research shows that after the flow battery operates for a period of time under the high-temperature condition, the capacity of the flow battery can be reduced by tens of percent, and the economy and the reliability of the battery are seriously affected. (III) Effect on Battery safety Abnormal changes in electrolyte temperature can also pose a threat to the safety of flow batteries. When the temperature is too high, the organic solvent in the electrolyte may volatilize, forming a flammable gas, increasing the risk of fire and explosion of the battery. In addition, the high temperature may cause a pressure increase inside the battery, and if the safety valve fails, serious accidents such as leakage and explosion of the electrolyte may be caused. In a low-temperature environment, the fluidity of the electrolyte is poor, which may cause excessive local current density in the battery and local overheating, thereby causing potential safety ha