A perceiving method and system of a stack state for a fuel cell system is provided. The method includes determining whether a vehicle provided with the fuel cell system is started and calculating a time until first condensate water is discharged through a condensate water discharging valve provided in the fuel cell system after the vehicle starts. Then, an average time until the first condensate water is discharged after the vehicle starts, at the previous starting of the vehicle is calculated over a predetermined number of times. The two calculated times are compared to determine the state of the stack or cathode of the fuel cell system without requiring additional separate components.

A system for detecting humidity level at a cathode of a fuel cell stack including one or more PEMFCs and determining a flooding probability of the stack based on the humidity level, includes a stack including a plurality of PEMFCs, each PEMFC including an exhaust; voltage detector; humidity detector; and controller. The controller may be configured to: receive a voltage as measured at an anode of one or more of the PEMFCs with the voltage detector; determine a humidity level at the exhaust of the one or more of the PEMFCs; and implement one or more actions based on the voltage and the humidity level, the actions including: reduce a load on the PEMFC; increase an air flow at a cathode of the one or more PEMFCs; decrease an inlet humidity at an inlet to the one or more PEMFCs; or increase a temperature of the one or more PEMFCs.

A method for operating a fuel cell system comprises: feeding an oxidation gas stream to a cathode inlet of a cathode of a fuel cell of the fuel cell system; feeding a cathode exhaust gas stream from a cathode outlet of the cathode to an exhaust gas inlet of the humidifier; discharging the cathode exhaust gas stream from the humidifier via an exhaust gas outlet of the humidifier; humidifying the oxidation gas stream in the humidifier by means of the water extracted from the cathode exhaust gas stream; determining at least one of the following indicators for the moisture content of the cathode exhaust gas: a pressure drop between the cathode inlet and the cathode outlet, a pressure drop between the exhaust gas inlet and the exhaust gas outlet of the humidifier, a first temperature difference of the cathode exhaust gas stream between the exhaust gas inlet and the exhaust gas outlet of the humidifier, a second temperature difference of the oxidation gas stream between the oxidation gas inlet and the oxidation gas outlet of the humidifier, and varying a moisture feed to the cathode inlet and/or moisture removal from the cathode by adjusting at least one operating parameter of the fuel cell system on the basis of the at least one determined indicator.

A fuel cell control method includes calculating an amount of water in a humidifier using a production amount of water at a cathode of a fuel cell, a discharge amount of saturated vapor and a discharge amount of water at an anode, judging whether or not a vehicle is in a driving state using state information of the vehicle, judging humidity of air in the fuel cell stack upon judging that the vehicle is in the driving state, increasing RPM of an air blower and activating the air blower when the amount of water is greater than a first threshold and a second condition is satisfied, if first conditions are satisfied, and activating a heater when the amount of water is greater than a second threshold, if the first conditions are not satisfied.

The present invention relates to a fuel cell assembly having a fuel cell and an actuating element, which is activated by a control unit, for bringing residual gas out of a fuel flow of the fuel cell. The invention is provided with the control unit having an open-loop and/or closed-loop control system which takes into consideration the fuel concentration in the fuel flow.

Disclosed is a device for adjusting humidification gas of a membrane humidification device of a fuel cell. In particular, the device is adapted to induce changes in differential pressure and velocity of the wet air for each division module and to improve the humidification efficiency by sequentially mounting the division modules divided into various numbers to the interior of a housing of the membrane humidification device, thereby adjusting the density of the hollow fiber membrane filled in each division module.

A fuel cell system includes a fuel cell stack and a mounting section. The fuel cell stack is mounted on the mounting section with inclination. The fuel cell stack is formed by stacking a plurality of fuel cells in a vertical direction. An oxygen-containing gas in an oxygen-containing gas flow field and a fuel gas in a fuel gas flow field flow in a counterflow manner. In a front box of a vehicle, an inlet side of the fuel gas flow field is positioned above an outlet side of the fuel gas flow field with respect to a horizontal direction. In this state, the fuel cell stack is mounted on the mounting section. The fuel cell stack is inclined downward from the horizontal direction toward the back of the vehicle in a vehicle length direction.

A fire-protection system (1) reduces a danger of fire in a protective space. The fire-protection system includes a fuel cell (3) with a cathode exhaust gas output (25) which is strictly separated from an anode output (27), for the provision of an oxygen-reduced cathode exhaust gas with an oxygen content of at the most 15.0% by volume at the cathode exhaust gas output, a drying system (35) which is connected downstream of the cathode exhaust gas output, for drying the oxygen-reduced cathode exhaust gas before the oxygen-reduced cathode exhaust gas is led into the protective space (54), and a control system (51) which is configured to determine a current dew point of the oxygen-reduced cathode exhaust gas which is dried by the drying system and to lead the dried, oxygen-reduced cathode exhaust gas into the protective space only when the current dew point lies below as settable maximal dew point.

A metal air battery includes a first battery cell module which generates electricity by oxidation of a metal and reduction of oxygen, a second battery cell module in fluid-communication with the first battery cell module and which generates electricity by oxidation of a metal and reduction of oxygen, and an air purifier in fluid-communication with the second battery cell module, where the air purifier purifies external air to supply first purified air to the second battery cell module, and the second battery cell module supplies second purified air generated by the oxidation of the metal and the reduction of the oxygen to the first battery cell module

A computer system has processing circuitry configured to issue control information to a fuel cell system being fueled by hydrogen gas and air. The air is supplied to the fuel cell system at an air feeding pressure. The fuel cell system being adapted to be cooled by a cooling system accommodating a coolant.