Through the coupling of electrochemical reaction, mechanical loss, thermodynamic and voltage dynamic response of iodine zinc flow battery, the important parameters of the model were obtained by experiments and tests, and a comprehensive description of the mixed model of iodine zinc flow battery was established. The electrochemical model comprehensively considers ohm internal resistance, polarization loss and mechanical loss model to describe the pump loss of the flow battery, and the thermodynamic model to describe the heat transfer process inside the battery. The PNGV equivalent circuit model of the iodine zinc flow battery is established according to the dynamic response of the battery, and the temperature in the thermodynamic model is introduced as a variable parameter. The measurement and fitting methods of the model are analyzed. The simulation and experimental results show that the established mixing model can accurately reflect the basic characteristics of the battery under temperature changes.