In a joint project, the Paul Scherrer Institut PSI, ETH Zurich, FEV Motorentechnik and Volkswagen have developed the fuel cell hybrid vehicle “Hy.Power”. Hy.Power is a technology platform for the demonstration of a powertrain combining a hydrogen fuel cell system designed for 40 kW peak net power output and a double‐layer capacitor arrangement with a peak power of 60 kW net. The gaseous hydrogen is stored in pressurized tanks of up to 350 bar. The potential of innovative technologies, such as newly designed bipolar plates and double‐layer capacitors as well as new air supply and humidification concepts, are tested under real conditions. The fuel cell system consists of six fuel cell stacks into which the media are fed in parallel. The performance of the Hy.Power technology demonstrator was successfully tested under extreme boundary conditions by crossing the Simplon Pass in the wintry Alps in January 2002.

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