Abstract:
A supply path (22) of hydrogen gas in a fuel cell system (1) connects a plurality of fuel cell stacks (10A, 10B) in series with each other. The supply path (22) includes a downstream supply path (22B) configured to supply the fuel cell stack (10B) on a downstream side with exhaust gas of hydrogen gas supplied to the fuel cell stack (10A) on an upstream side, without circulating the exhaust gas to the fuel cell stack (10A) on the upstream side, and a circulating path (24B) configured to circulate exhaust gas from the fuel cell stack (10B) on the downstream side to the fuel cell stack (10B) on the downstream side.
Abstract:
Flow field plates in solid polymer electrolyte fuel cells can be subject to ice blockages in certain areas during freeze start-up, e.g. the backfeed ports and slots used in some flow field plate designs which connect an outlet plenum channel for a reactant to its outlet. By incorporating a similar and adjacent relief backfeed port, slot and plenum channel arrangement in which the relief plenum channel is separated from the outlet plenum channel by a landing, a relief outlet for the reactant is provided through the adjacent gas diffusion layer.
Abstract:
The present invention includes a fuel cell (11) mounted on a vehicle to generate electric power using oxidation gas and fuel gas being supplied thereto; an oil temperature sensor (29) configured to detect oil temperature of a compressor (12); and a controller (14) configured to control driving of the compressor (12), and also control pressure of the oxidation gas and pressure of the fuel gas being supplied to the fuel cell (11). The controller (14) performs a control of decreasing rotational speed of the compressor (12) when the oil temperature (Tc) has exceeded an oil temperature threshold (T1), and further performs a control of balancing the pressure of the oxidation gas and the pressure of the fuel gas. Therefore, it becomes possible to stably operate the fuel cell (11).
Abstract:
A fuel cell system includes: a cathode pressure control unit configured to control a pressure of a cathode gas to be supplied to the fuel cell stack on the basis of a load of the fuel cell stack; and an anode pressure control unit configured to control a pressure of an anode gas to be supplied to the fuel cell stack to become higher than the pressure of the cathode gas so that a differential pressure between the pressure of the anode gas and the pressure of the cathode gas becomes a predetermined differential pressure or lower. The anode pressure control unit controls, at a time of recovery from idle stop, the pressure of the anode gas to be supplied to the fuel cell stack to a recovery-time pressure, the recovery-time pressure being obtained by adding the predetermined differential pressure to a predetermined pressure corresponding to an atmosphere pressure.
Abstract:
A high efficiency fuel cell system comprising a topping fuel cell assembly comprising a topping cathode portion and a topping anode portion; and a bottoming fuel cell assembly comprising a bottoming cathode portion and a bottoming anode portion, wherein the bottoming anode portion receives anode exhaust output from the topping anode portion and the topping cathode portion receives cathode exhaust from the bottoming cathode portion, and wherein the topping fuel cell assembly has a greater number of fuel cells than the bottoming fuel cell assembly so that the topping fuel cell assembly utilizes more fuel than the bottoming fuel cell assembly.
Abstract:
Um bei einem Brennstoffzellensystem, in dem die Reaktanten Wasserstoff (H2) und Sauerstoff (02) in separat geregelten Gaskreisläufen (8, 9) zirkulieren, die Regelung der Restgasausbringung über Entsorgungsventilen (14, 15) auf die Randbedingungen innerhalb einer geschlossenen außenluftunabhängigen Anlage abzustimmen, sind an der Regeleinrichtung (16) Sensoren (17, 18) zur Messung der Konzentrationen (c H2 , c O2 ) der beiden Reaktanten (H2, 02) in der außenluftunabhängigen Anlage (2) angeschlossen. Die Regeleinrichtung (16) ist dazu ausgebildet, die Stelleingriffe an den Entsorgungsventilen (14, 15) in Abhängigkeit von Messwerten der Sensoren (17, 18) zu modifizieren, um die Ausleitungsmenge eines der beiden Reaktanten (z. B. H2) zu verringern, wenn seine Konzentration (c H2 ) in der in der außenluftunabhängigen Anlage (2) eine vorgegebene Obergrenze (OG-c H2 ) überschreitet, oder die Ausleitungsmengen beider Reaktanten (H2, 02) zu verringern, wenn ihre Konzentrationen (c H2 , c O2 ) in der in der außenluftunabhängigen Anlage (2) vorgegebene Obergrenzen (OG-c H2 , OG-c O2 ) überschreiten.
Abstract:
A device includes a container having a top plate containing an array of oxygen limiting pinholes and a chamber to hold a chemical hydride fuel, a fuel cell proton exchange membrane electrode assembly supported within the container between the top plate and the chamber, a first gas diffusion layer supported between the fuel cell proton exchange membrane electrode assembly and the top plate, and a second gas diffusion layer supported between the fuel cell proton exchange membrane electrode assembly and the chamber.
Abstract:
A device (100, 400) includes a container (110, 410) having a top plate (115, 415) containing an array of oxygen limiting pinholes (120, 320, 420) and a chamber (125, 425) to hold a chemical hydride fuel, a fuel cell membrane electrode assembly (430) supported within the container (110, 410) between the top plate (115, 415) and the chamber (125, 425) positioned to receive oxygen from the pinholes (120, 320, 420) and hydrogen from the chamber (125, 425), and a valve assembly (445, 450, 455) positioned to regulate additional flow of oxygen to the fuel cell proton exchange membrane electrode assembly (430) responsive to hydrogen pressure in the chamber (125, 425).