A fuel cell power module is used to provide nitrogen enriched air for, in one application, fuel tank inerting in an aircraft. The fuel cell power module has a recirculation line between its cathode side outlet and cathode side inlet. At least one controllable device is provided to allow the flow rate in the recirculation line to be controlled. The recirculation flow rate is adjusted such that the cathode exhaust has an oxygen concentration useful for inerting a fuel tank or suppressing fire.

Nitrogen enriched air generation and fuel tank inerting 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.

Fuel cell system having a fuel cell stack arranged in a housing, and a measure for ventilating the housing

The invention relates to the exhaust air guide of a fuel cell stack, in particular in a motor vehicle, with a cooling device which belongs to the functional environment of the fuel cell stack and is in the form of a cooler structure through which ambient air flows, wherein at least some of the exhaust air of the fuel cell stack is guided into the cooler structure or behind the cooler structure, as viewed in the direction of flow of the ambient air through the cooler structure, to such an extent that, at the cooler structure, said exhaust air flow brings about an increase in the mass flow of the ambient air through the cooler structure in accordance with the jet pump principle or, at the cooler structure, said exhaust air flow, in accordance with the jet pump principle, brings about a pressure difference conveying at least a portion of the ambient air through the cooler structure

Exhaust air guide of a fuel cell stack in a motor vehicle

The disclosure relates to a fuel cell system comprising a fuel cell stack for providing an electrical power Pstack depending on a power demand, at least one auxiliary unit for operating the fuel cell stack with an electrical power consumption Paux, at least one consumer with an electrical power request Puse, and a control unit for regulating the power demand as well as a method for controlling such a fuel cell system. It is provided that the control unit is configured to selectively operate the fuel cell system in a first operating mode or in a second operating mode, whereby the fuel cell stack is turned off depending on the operating mode upon the falling below of an optimal efficiency degree operating point P(ηmax) of the fuel cell system or a minimum operating point Pmin of the fuel cell stack. In particular, at least one auxiliary unit is also turned off in the first operating mode, when the optimal efficiency degree operating point decreases.

Fuel cell system and method for operating a fuel cell system

A separator for a fuel cell includes a thin metal plate, protrusions that are formed on the metal plate to be close to each other, and gas passages formed by the protrusions. Each gas passage has a first opening corresponding to an inlet and a second opening corresponding to an outlet. The gas passages include a first gas passage, which has a relatively low pressure loss of gas flow, and a second gas passage, which has a relatively high pressure loss of gas flow. The area of the first opening of the first gas passage is set to be smaller than the area of the first opening of the second gas passage.

Separator for fuel cell

The invention relates to an operating method for an electric system of a motor vehicle, consisting of a fuel cell system, an accumulator, and an electric drive motor, which are electrically coupled to each other, with switching elements inserted therebetween. Without performing an electric voltage conversion, and consequently without an electric voltage converter, and depending on the electric voltage level made available by the fuel cell system and by the accumulator, and on the power required by the electric motor, a first switching element is opened and closed as needed in the connection between the fuel cell system and a node point that is electrically connected to the accumulator and to the electric motor, and a second switching element is opened and closed as needed in the connection between the accumulator and said node point, in such a manner that the power requirement of the electric motor is met primarily by the fuel cell system and additionally in auxiliary manner by the accumulator, and in that, if the electric power made available by the fuel cell system exceeds the power required by the electric motor, the power excess is applied to the accumulator as long as the admissible charging current thereof is not exceeded and the accumulator still has a defined residual storage capacity.

Operating method for an electric energy system of a motor vehicle comprising a fuel cell system, an accumulator and an electric motor

Die Erfindung betrifft ein Betriebsverfahren eines elektrischen Systems eines Kraftfahrzeugs, bestehend aus einer Brennstoffzellen-Anlage, einem Akkumulator und einem Elektro-Antriebsmotor, die unter Zwischenschaltung von Schaltelementen elektrisch aneinander gekoppelt sind. Dabei wird ohne Durchfuhrung einer elektrischen Spannungs-Wandlung und folglich ohne elektrischen Spannungswandler in Abhangigkeit von der Hohe der von der Brennstoffzellen-Anlage und vom Akkumulator angebotenen elektrischen Spannungsniveaus und der vom Elektromotor nachgefragten Leistung ein erstes Schaltelement in der Verbindung zwischen der Brennstoffzellen-Anlage und einem mit dem Akkumulator und dem Elektromotor elektrisch verbunden Knotenpunkt sowie ein zweites Schaltelement in der Verbindung zwischen dem Akkumulator und diesem Knotenpunkt derart bedarfsgerecht geoffnet oder geschlossen, dass der Leistungsbedarf des Elektromotors vorrangig aus der Brennstoffzellen-Anlage und hilfsweise zusatzlich aus dem Akkumulator befriedigt wird und dass dann, wenn die von der Brennstoffzellen-Anlage angebotene elektrische Leistung die vom Elektromotor nachgefragte Leistung ubersteigt, der Leistungs-Uberschuss solange dem Akkumulator zugefuhrt wird, als dessen zulassiger Lade-Strom nicht uberschritten wird und der Akkumulator noch ein definiertes Rest-Speichervermogen besitzt.

Betriebsverfahren eines elektrischen Energie-Systems eines Kraftfahrzeugs

Eine Brennstoffzelle ist mit einem Anoden-Kathoden-Stapel gestaltet, der mindestens eine aktive Flachenschicht umfasst, die mit einer ersten Kanalstruktur mit einer Vielzahl erster Kanale zum Leiten eines ersten Fluides in einer ersten Richtung uber die Flachenschicht gestaltet ist, die mit einer zweiten Kanalstruktur mit einer Vielzahl zweiter Kanale zum Leiten eines zweiten Fluides in einer zweiten Richtung uber die Flachenschicht gestaltet ist, wobei sich die zweite Richtung im Wesentlichen quer zur ersten Richtung erstreckt, die mit einer ersten Zuleitstruktur zum Zuleiten des ersten Fluides in die Vielzahl erster Kanale gestaltet ist und die mit einer zweiten Zuleitstruktur zum Zuleiten des zweiten Fluides in die Vielzahl zweiter Kanale gestaltet ist. Erfindungsgemas sind die erste Zuleitstruktur und die zweite Zuleitstruktur beide an einem ersten Rand der Flachenschicht angeordnet und die erste Zuleitstruktur weist zusatzlich einen Randkanal zum Zuleiten des ersten Fluides an einen zum ersten Rand quergerichteten, zweiten Rand der Flachenschicht auf.

Brennstoffzelle mit mindestens einer aktiven Flächenschicht

In a motor vehicle having a fuel cell, an air compressor provides input air under pressure at the fuel cell and an electric drive motor for driving the motor vehicle, which drive motor can be supplied with electric current by the fuel cell for that purpose, wherein the air compressor is driven by the drive motor.

Motor Vehicle Having a Fuel Cell

The invention relates to the guiding of exhaust of a fuel cell stack, in particular in a motor vehicle, having a cooling device, which is part of the functional environment of the fuel cell stack, in the form of a cooler structure through which ambient air flows, wherein the exhaust air of the fuel cell stack is guided in front of said cooler structure such that said exhaust air flows through the cooler structure in the flow direction and carries ambient air along according to the jet pump principle. The exhaust air of the fuel cell stack can be cooled before approaching the cooler structure, and the exhaust air of the fuel cell stack is preferably guided in a plurality of tubes aligned at least approximately parallel to the airflow surface of the cooler structure in front of the cooler structure, from which the exhaust air emerges via exit openings in the tube wall which lie at a suitable angle to the flow direction.

Exhaust guiding of a fuel cell stack in a motor vehicle

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