Bayerische Motoren Werke Aktiengesellschaft

Norbert Frisch

Johannes Schmid

Michael Bauer

Martin Scherrer

Martin Moser

Martin Thomas

Volker Formanski

Stephan Friedrich

A method for determining a sealing tightness of a fuel cell stack includes providing of fuel into a cathode space, sealed off gas-tight against further components of a cathode subsystem, formed at least partly by the fuel cell stack, and detecting of a value which is indicative of a pressure change in the cathode space, where a cathode test pressure in the cathode space is higher than a pressure outside the fuel cell stack.

Method for determining the sealing tightness of a fuel cell stack

A method is provided for purging a fuel cell. The method is characterized by suctioning the purge gas through the fuel cell by use of low pressure.

Method for purging a fuel cell and device for carrying out said method

An exhaust system is provided for a device having at least one fuel cell. The exhaust system includes at least one exhaust duct for transporting anode-side and/or cathode-side exhaust gas of the fuel cell, at least one air inlet for supplying air, at least one air feeding device for feeding in the supplied air, at least one heat exchanger for heating up the supplied air, a mixing region for mixing exhaust gas of the fuel cell transported by way of the exhaust duct with the supplied air and forming a mixed exhaust gas, and a mixed exhaust gas outlet for carrying the mixed exhaust gas away from the exhaust system.

Exhaust gas system and motor vehicle having an exhaust gas system

A fuel cell system, in particular for a motor vehicle, has a fuel cell stack arranged in a housing and a measure for ventilating this housing by coupling the ventilation stream to another gas stream. The ventilation stream is fed to an air stream which is conducted through a radiator of the fuel cell system. The radiator is an ambient air heat exchanger. If the ventilation stream is fed in upstream of the radiator, a venting opening in the housing can be placed in such a way that the ventilation stream is entrained to the radiator by the inflow air stream. Alternatively, the ventilation stream can be fed to an exhaust gas stream of the fuel cell stack and the latter can be fed to the outflow stream of the radiator. A sensor for determining the hydrogen content in a gas stream downstream of the point where the ventilation stream is fed may be provided. An electronic monitoring device which, on the basis of this sensor signal, draws a conclusion about hydrogen which is possibly located in a free state within the housing.

Growing community of inventors

Planegg, Germany

Norbert Frisch