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This paper presents the some issues related to modeling of hydrogen fuel-cell based propulsion systems and the main characteristics of the corresponding simulation program developed in Matlab-Simulink™ environment by the authors. Although several hybrid vehicle simulators are available today, often researchers prefer to create programs of their own, to pursue specific pursues. The authors have gone in this direction, and with this paper they intend to share this experience with readers wanting to do a similar job, hoping they can find useful hints to direct their activity. The paper shows therefore the main issues to be tackled when creating hybrid vehicle simulation programs in general, and fuel-cell based in particular, and gives some details on individual component modeling.

Lithium batteries are increasingly being considered for installation as power sources in electric and hybrid vehicles, because of their high specific energy and power. To effectively size the vehicle Rechargeable Energy Storage System, it is very important to be able to mathematically model their behaviour. Battery modelling is also very useful for on-line management of electric and hybrid vehicles. This paper presents a dynamic model of lithium batteries based on experimental tests on high power Lithium-polymer models. The results can be adapted, with suitable parameter evaluation, to other lithium batteries as well.