Abstract
In order to investigate basic output performances of PEMFC (Proton Exchange Membrane Fuel Cell) stack, a dynamic model of PEMFC stack has been developed by combining electrochemical sub-model and thermodynamic sub-model. With necessary validation, it demonstrates that modelling results and experimental data are in very good agreement in terms the U-I curve and power output. By applying the dynamic model to analyse performance outputs of PEMFC stack and applying the model for FC-Hybrid vehicle powertrain configuration, it demonstrates that improved PEMFC quality with increased maximum current density could increase the peak power output and also increase the working efficiency, although the increase of peak power is not linear relation with the increase of maximum current density. Higher working temperature of PEMFC would benefit the increases of both peak power output and efficiency. Compared to working temperature, ambient temperature’s increase could also make positive influence on power output and efficiency, though the influence is weak. Coupling the dynamic model with a powertrain model of FC-Electric hybrid vehicle, the analysis suggests that both PEMFC stack and battery stack should have similar size for general driving condition. Too big either PEMFC stack or battery stack would increase the total weight then contaminate the fuel/energy economy.
Highlights
Along with the commercialisation of ground electric vehicles including hybrid vehicles and battery vehicles, the development of FCVs (Fuel Cell Vehicles) has been rapidly accelerated in recent years
In order to investigate basic output performances of PEMFC (Proton Exchange Membrane Fuel Cell) stack, a dynamic model of PEMFC stack has been developed by combining electrochemical sub-model and thermodynamic sub-model
Higher working temperature of PEMFC would benefit the increases of both peak power output and efficiency
Summary
Along with the commercialisation of ground electric vehicles including hybrid vehicles and battery vehicles, the development of FCVs (Fuel Cell Vehicles) has been rapidly accelerated in recent years. In addition to wide CFD (Computational Fluid Dynamic) investigations to internal flows and external cooling systems [5, 6], various control models [7, 8] and dynamic models [9, 10] have been developed and applied for studying some fuel cell components’ performances or entire stack systems’ operating performances It is the objective of this study to build a dynamic model of PEMFC stack which can be easy to couple with FCV powertrain model for exploring the powertrain’s working performances under various design and operating conditions
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