FUEL-CELL SYSTEM AND A METHOD FOR SWITCHING ON/SWITCHING OFF A FUEL-CELL SYSTEM

摘要

The invention relates to a fuel-cell system comprising a fuel cell and a number of secondary units for starting and operating the fuel cell. According to the invention, to improve the dynamics of the operating cycle of the fuel cell system, for example if the fuel cell system is to be cold started or restarted immediately after the system has been switched off, a device for switching on/off the fuel cell and the secondary units is provided. Said device allows at least individual secondary units and/or the fuel cell to be switched on/off or switches on/off said units and the cell independently of one another. The stepped switch-off of the fuel-cell system permits, for example, the secondary units that are necessary for a rapid re-start to remain in operation and thus be maintained at the required operating temperature, whereas less important secondary units can be switched off. The invention also relates to a method for switching on/off a fuel-cell system of this type.