Abstract
Today's external fuel cell control by regulation of flow rates, pressures and relative humidities of the used gases has a slow control effect on the fuel cell output voltage. At high dynamic loads these common control strategies lead to voltage and power drops of several seconds to minutes, depending on the fuel cell system size. Therefore, system oversizing is necessary to meet the requirements of dynamic load profiles. In this paper a new approach of an internal electrical fuel cell membrane control with an electric field modifier (EFM) is proposed. The EFM control unit consists of EFM electrodes that are placed directly on or in the membrane of polymer exchange membrane fuel cells and are connected to an external controllable voltage source. Deduced advantages include a better dynamic fuel cell system voltage behavior, a cost-and weight-optimized on-board grid integration, and a prolonged membrane durability.
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