A fuel cell system that generates electric power by supplying anode gas and cathode gas to a fuel cell includes a control valve adapted to control the pressure of the anode gas to be supplied to the fuel cell; a buffer unit adapted to store the anode-off gas to be discharged from the fuel cell; a pulsation operation unit adapted to control the control valve in order to periodically increase and decrease the pressure of the anode gas at a specific width of the pulsation; and a pulsation width correcting unit adapted to correct the width of the pulsation on the basis of the temperature of the buffer unit.

The present disclosure generally relates to systems and methods for determining, managing, and/or controlling excess hydrogen flow in a system comprising a fuel cell or fuel cell stack and ejector based on the internal state of the ejector.

The present disclosure generally relates to systems and methods for managing and/or excess hydrogen flow in a system comprising a fuel cell or fuel cell stack based on humidity measurements.

The present disclosure generally relates to systems and methods for determining, managing, and/or controlling excess hydrogen flow in a system comprising a fuel cell or fuel cell stack.

A method for purging the hydrogen feed anode circuit of a fuel cell, whereby hydrogen is fed at a nominal pressure to the inlet of the cell, characterized in that at predetermined periodicity the following steps are repeated: instruction is given to open the hydrogen purge valve arranged on the outlet of the anode circuit; the pressure of hydrogen is measured at the inlet to the anode circuit of the cell, and the measured value is compared with a predetermined threshold pressure value; and the purge valve is closed when the measured pressure is equal to or lower than the predetermined threshold pressure value.

A device intended to generate electricity includes a planar fuel cell having: cells each provided with an anode and a cathode associated with a membrane, and a first face and a second face opposite to the first face, the first face being arranged on the side with the anodes of the fuel cell and the second face being arranged on the side with the cathodes of the fuel cell. Furthermore, this device includes a system configured to generate a first air flow intended to cooperate thermally with the first face, and configured to generate a second air flow intended to cooperate with the second face to ensure the supply of oxidizer to the cathodes of the fuel cell.

A PEM fuel or electrolysis cell with an extended lifetime, improved performance and uniform and stable operation is disclosed wherein a membrane electrode assembly is provided with a gradient of one or more properties in combination with a modification of one or more control parameters of the cell during its operation.

A method comprising feeding a fuel and an oxidant to individual cells in a fuel cell stack, each having two electrode layers and an electrolyte layer arranged between the electrode layers. The method further includes compressing the cell stack with a clamping device, and detecting a compression pressure upon the cell stack with at least one pressure sensor. The method also includes determining a moisture content of the two electrolyte layers based on the detected compression pressure.

A first representative value is acquired representing an amount of liquid water in a hydrogen gas passage (30) when a fuel cell stack (10) is to be started up. Based on the first representative value, a first purge gas amount is calculated. A second representative value is acquired representing a concentration of hydrogen gas in a hydrogen gas passage when the fuel cell stack is to be started up. Based on the second representative value, a second purge gas amount is calculated. The greater of the first purge gas amount and the second purge gas amount is set as a startup purge gas amount. When the fuel cell stack is to be started up, hydrogen gas is fed to the fuel cell stack while the purge control valve 38 is temporally opened to purge the gas by the startup purge gas amount.

Various embodiments of the present disclosure are directed to methods and systems for determining at least one actual value of a controlled variable of a conditioning unit for a reactant of a fuel cell. In one example embodiment, the method steps for determining the at least one actual value of a controlled variable includes: measuring a measured value of the actual value of the at least one controlled variable, calculating a model value of the at least one controlled variable using a model of the conditioning unit, calculating a model value of the actual value of the at least one controlled variable using a sensor model, calculating a correction value for the at least one controlled variable, and calculating the actual value of the at least one controlled variable as the sum of the correction value and of the model value of the at least one controlled variable.