Research On Hybrid Model Of Zinc-Iodine Flow Battery

With the development of today’s society,human’s demand for traditional fossil fuels and other kinds of energy has been increasing,and fossil energy has been gradually exhausted,and the earth’s environment has also begun to deteriorate.Large-scale development of the use of renewable energy has become a goal pursued by research groups.Iodine and zinc REDOX flow batteries are promising energy storage systems because of their advantages in energy density and environmental protection.However,zinc-iodine flow battery is currently in the experimental stage,and there is no large-scale research team in China on this battery.In this paper,zinc-iodine flow battery was prepared in the laboratory,and its performance was analyzed through experimental tests and models,which laid a foundation for the further application of zinc-iodine flow battery.The main research work of this paper is as follows:First,according to the working principle and reaction mechanism of zinc-iodine flow battery,the single cell stack and positive and negative electrolyte suitable for laboratory were prepared.The electrochemical principle and basic characteristics of zinc-iodine flow battery were analyzed in detail.The characteristics and performance of the battery were analyzed by experimental design and test of the prepared zinc-iodine flow battery.Secondly,the dynamic characteristics of zinc-iodine flow battery were comprehensively described through the electrochemical model,mechanical model and thermodynamic model,and the important parameters of the zinc-iodine flow battery model were listed.The simulation model of the dynamic characteristics of the battery established was built in Matlab/Simulink,and the validity of the model was verified by comparing the experimental data of zinc-iodine flow battery.At the same time,the voltage characteristic relationship of zinc-iodine flow battery was analyzed,the equivalent circuit model of PNGV was established,and relevant parameters were identified.Based on the MATLAB/Simulink module,a simulation model that could characterize the voltage variation characteristics of the battery was built,and the effect of the simulation model of the circuit model was verified.Thirdly,based on the composition and working principle of zinc-iodine flow battery,a hybrid model of zinc-iodine flow battery was established by coupling the PVGV equivalent circuit model,electrochemical model,mechanical model and thermodynamic model.The accuracy of the model was verified by Matlab/Simulink module.The hybrid model can describe the related characteristics of zinc-iodine flow battery under dynamic change factors.Compared with the single equivalent circuit model and the electrochemical model,the model is more comprehensive.The battery model calculates the SOC of the battery based on the concentration of active substance in the stack.At the same time,it can describe the changes of battery capacity performance and voltage characteristics under different working conditions,and the model can more accurately show the basic characteristics of zinc-iodine flow battery.