Dynamic cross-scale modeling and thermo-electric response characteristics of PEMFC based on standardized thermal resistance

Analyzing the dynamic characteristics of pairs of polymer electrolyte membrane fuel cell (PEMFC) is crucial for enhancing the efficiency and flexibility of the system in which it is utilized. In order to accurately reflect its dynamic process and investigate the interaction between the heat and electricity, this paper adopted the standardized thermal resistance method to build a dynamic model of PEMFC. On this basis, a simulation comparison with the experimental data is performed to verify the accuracy of the proposed model. Moreover, we propsoed a two-stage comprehensive response analysis method of the PEMFC under thermo-electric coupling with corresponding key parameters, such as the fuel inlet temperature, gas excess coefficient and load variation amplitude in multiple scenarios. The results show that the comprehensive response characteristics are better when fuel gas inlet temperature is 40celcius or excess oxygen coefficient is 2.4 in the corresponding scenarios. The model, analysis method and findings in this paper provide an effective reference for the development of optimal control strategies for the PEMFC stack temperature as well as other parameters to improve its comprehensive dynamic response performance.