The invention relates to a method for operating a fuel cell system, in particular a PEM fuel cell system, in which an QI anode gas is supplied to an anode (1) of a fuel cell via a supply path (2), and is fed back via a recirculation path (3) connected to the anode (1), wherein hydrogen is used as the anode gas. According to the invention, during the start up of the fuel cell system, the anode gas is supplied to a drying device (4), in particular an adsorber, via at least one normally open valve (8, 9, 10), and water is extracted from the anode gas using the drying device (4). The invention also relates to a fuel cell system, in particular a PEM fuel cell system, which is suitable for carrying out the method.

Disclosed is a system for determining a hydrogen supply failure of a fuel cell, the system including: a fuel cell, a plurality of hydrogen tanks having hydrogen, a hydrogen supply line connected to the hydrogen tanks and supplying hydrogen from the hydrogen tanks to the fuel cell, a plurality of tank valves mounted on the hydrogen tanks, respectively, and discharging hydrogen in the hydrogen tanks to the hydrogen supply line when opening, a pressure sensor sensing pressure in the hydrogen supply line, and a determiner determining poor opening of the hydrogen tanks on the basis of pressure information sensed by the pressure sensor.

A module includes a first member that is a battery or a gas tank in which pressure fluctuation happens along one axis direction, a pair of second members, the second members being arranged on end portions of the first member in the one axis direction, respectively, and a binding member binding the first member and the second members while pressurizing them. The binding member is formed as fiber-reinforced plastic (FRP) containing fiber and resin is revolved. The FRP includes a base fiber layer with a fiber direction along a revolution direction, and a reinforcing fiber layer with a fiber direction different from that of the base fiber layer. The reinforcing fiber layer has a non-overlapping portion between both end portions in a revolved state. The non-overlapping portion is positioned in a region facing the first member.

A fuel cell system includes a fuel cell stack including fuel and air electrodes, a fuel gas supply module configured to supply hydrogen and oxygen, as fuel gases, to the fuel cell stack, a fuel gas supply line including channels through which the fuel gases are supplied to the fuel cell stack, a humidification module disposed in the fuel gas supply line and configured to supply moisture to the fuel gases, and a controller configured to control the fuel gas supply line such that the fuel gases bypass the humidification module and are directly supplied to the fuel cell stack when temperature of the fuel cell stack is determined low at an initial stage of operation of the fuel cell stack, and the fuel gases pass through the humidification module and are supplied to the fuel cell stack when the temperature reaches a normal temperature.

Methods and systems are provided for a cooling system for a vehicle having a fuel cell system. The cooling system comprises a first cooling circuit configured to cool a first set of vehicle components and a second cooling circuit configured to cool a second set of vehicle components. The fuel cell system is distributed between the first set of vehicle components and the second set of vehicle components.

A drive system of an aircraft, including a fuel cell, which can be supplied with hydrogen from a hydrogen tank and with air from a blower, the fuel cell being configured to provide drive power for operational flight after takeoff and before landing dependent on a hydrogen mass flow supplied by the hydrogen tank and dependent on an air mass flow supplied by the blower, and an electrical energy store, which is configured to provide additional drive power for takeoff and landing, wherein an additional hydrogen tank and an air or oxygen tank are configured to interact with the fuel cell such that the fuel cell can be supplied with an additional hydrogen mass flow and with an additional air or oxygen mass flow, thereby compensating at least partially for a loss of the additional drive power provided by the electrical energy store for landing.

A system for a fuel cell vehicle includes a providing fuel cell fuel port, a fuel cell fuel storage tank, a fuel cell fuel flowmeter, and a pressure regulator. The fuel cell fuel storage tank is fluidically coupled to the providing fuel cell fuel port. The fuel cell fuel flowmeter is coupled between the fuel cell fuel port and the fuel cell fuel storage tank and is configured to measure flow of fuel cell fuel from the fuel cell fuel storage tank to the providing fuel cell fuel port. The pressure regulator is coupled between the fuel cell fuel flowmeter and the fuel cell fuel storage tank and is configured to control pressure of fuel cell fuel flowing from the fuel cell fuel storage tank to the providing fuel cell fuel port.

A fuel cell system is equipped with a control unit that controls a rotational speed of the turbo compressor that supplies air to an air supply flow passage and an opening degree of at least one valve that adjusts a flow rate and a pressure of the air supplied to a fuel cell such that an operating point of the turbo compressor becomes a target operating point. The control unit sets the target operating point within an operating point range that is on the higher flow rate side than at least part of a first region where an amount of change in flow rate is larger than a predetermined value when a pressure ratio of the turbo compressor is changed by a predetermined amount at a same rotational speed, on a higher flow rate side than a surging region, when a predetermined condition is fulfilled.

To provide a fuel cell system configured to prevent the freezing of the gas and water discharge valve of the fuel gas system even at high altitude. A fuel cell system for air vehicles, wherein the fuel cell system comprises: a fuel cell, a fuel gas system for supplying fuel gas to the fuel cell, a cooling system for controlling a temperature of the fuel cell, an altitude sensor, a temperature sensor, and a controller, and wherein, when the controller detects an altitude increase measured by the altitude sensor, and when a temperature of the gas and water discharge valve measured by the temperature sensor is less than a predetermined temperature, the controller increases a temperature of the refrigerant by controlling the three-way valve to circulate the refrigerant in the heating flow path and operating the circulation pump and the water heater to heat the refrigerant.

A fuel cell system for air vehicles, wherein the fuel cell system comprises: a fuel cell, a fuel gas system for supplying fuel gas to the fuel cell, a potential sensor, and a controller; wherein the fuel gas system comprises a fuel gas supplier; wherein the controller determines whether or not a potential of the fuel cell measured by the potential sensor, is a reversal potential; and wherein, when the controller determines that the potential of the fuel cell is a reversal potential, the controller increases a fuel gas supply from the fuel gas supplier to the fuel cell.