A combined cooling and humidifying system for a fuel cell system includes a first line strand, second line strand, gas separator, and water feed device. The first line strand has a supply line for feeding water to a heat exchanger of the fuel cell system and a return line for receiving a water-steam mixture from the fuel cell system. The gas separator is in the return line to at least partially separate the steam from the water-steam mixture and provide it at a steam connection. The second line strand has a fluid inlet for feeding a gaseous fluid to the fuel cell system. The steam connection is coupled to the second line strand downstream of the fluid inlet to admix steam with the fluid. The water feed device is coupled to the supply line to compensate for a separating mass flow of steam in the first line strand.

Disclosed is a cooling apparatus of a fuel cell vehicle, including an air supply part, an air conditioning part that cools air discharged from the air supply part, and a valve provided at a rear end of the air supply part and that communicates cooled air discharged from the air supply part with a fuel cell part or a battery.

The invention provides a water tank heating method and unit, an electronic device and a solid oxide fuel cell (SOFC) system. Before the SOFC system is started, ice in a water tank has been heated up, so after the SOFC system is started, the heating time of the heated ice, i.e., the thawing time of the water tank, will be shortened. Further, in the ice heating process, a pre-set needed SOFC thawing time determined according to current stack outlet temperature is used as a heating control parameter. As the stack outlet temperature is a key factor influencing the starting time of the SOFC system, the heating control will be more accurate if the pre-set needed SOFC thawing time corresponding to the stack outlet temperature is used as a heating control parameter.

The present disclosure generally relates to systems and methods for inducing a secondary flow from a first groove in a bipolar plate of a fuel cell to a second groove in the bipolar plate over a first land in the bipolar plate wherein the land is adjacent to a compressed section of a gas diffusion layer in the fuel cell, and wherein the secondary flow increases locally available oxygen and hydrogen at the membrane electrode assembly adjacent to the compressed section of the gas diffusion layer.

A method for treating hydrogen-containing and oxygen-containing residual gases of fuel cells, wherein the residual gases are fed to a gas circuit, and a residual gas mixture resulting therefrom is circulated in the gas circuit by a device for converting hydrogen and oxygen to water. In order to reduce the amount of hydrogen and oxygen in the residual gas mixture, at least part of the residual gas mixture is discharged from the gas circuit.

A method for humidifying a reactant in a fuel cell system is provided having a fuel cell stack, which is fluidically connected to a humidifier, wherein the humidifier comprises a membrane, on whose surface channels are formed. At least one of the channels is associated with a storage element for temporary storing of liquid water, the method involving the following steps: extracting the liquid water from the fuel cell stack and feeding the liquid water to the humidifier, admitting at least part of the liquid water into the storage element and temporarily storing the part therein, at least partially emptying the storage element by evaporating of the liquid water and humidifying of the reactant being supplied to the fuel cell stack by means of the evaporated liquid water, wherein the liquid water is extracted from the fuel cell stack both at the anode side and at the cathode side. A fuel cell system for carrying out the method is also provided.

A fuel cell system includes a fuel cell, first and second supply devices, a gas-liquid separator, a discharge valve, first and second ejectors for discharging fuel gas and off gas to the fuel cell, a measuring device for gas pressure, and a control device. The first ejector has a discharge amount smaller than the second ejector. The first ejector has a circulation amount larger than the second ejector. The control device executes the supply during a first time from the first supply device at each first cycle such that the pressure becomes a first target value, and when the first ejector is in an abnormal state, stops the first supply device, executes the supply during a shorter second time from the second supply device at each shorter second cycle such that the pressure becomes a higher second target value, and opens and closes the discharge valve at each first cycle.

The fuel cell system includes: a fuel cell; an anode supply pipe; a fuel gas supplier disposed at the anode supply pipe, the fuel gas supplier configured to adjust a supply quantity of a fuel gas to be supplied to the fuel cell; an ejector disposed at the anode supply pipe at a position between the fuel gas supplier and the anode supply port; an anode circulation pipe connected to the anode discharge port and the ejector; a circulation stop unit disposed at the anode circulation pipe, the circulation stop unit configured to stop circulation of the fuel gas through the anode circulation pipe; a pressure sensor configured to detect a pressure in the anode supply pipe at a position between the ejector and the anode supply port; and a controller. When a first pressure acquired from the pressure sensor is equal to or less than a predetermined lower limit value, the controller controls the fuel gas supplier to perform constant quantity supply control to supply the fuel gas of a predetermined supply quantity, and controls the circulation stop unit to perform circulation stop control to stop the circulation through the anode circulation pipe, and the controller determines abnormality at the ejector and the anode circulation pipe by using a second pressure acquired from the pressure sensor after the fuel gas supplier performs the constant quantity supply control and the circulation stop unit performs the circulation stop control.

The fuel cell system includes: a fuel cell; an anode supply pipe; a fuel gas supplier disposed at the anode supply pipe, the fuel gas supplier configured to adjust a supply quantity of a fuel gas to be supplied to the fuel cell; an ejector disposed at the anode supply pipe at a position between the fuel gas supplier and the anode supply port; an anode circulation pipe connected to the anode discharge port and the ejector; a circulation stop unit disposed at the anode circulation pipe, the circulation stop unit configured to stop circulation of the fuel gas through the anode circulation pipe; a pressure sensor configured to detect a pressure in the anode supply pipe at a position between the ejector and the anode supply port; and a controller. When a first pressure acquired from the pressure sensor is equal to or less than a predetermined lower limit value, the controller controls the fuel gas supplier to perform constant quantity supply control to supply the fuel gas of a predetermined supply quantity, and controls the circulation stop unit to perform circulation stop control to stop the circulation through the anode circulation pipe, and the controller determines abnormality at the ejector and the anode circulation pipe by using a second pressure acquired from the pressure sensor after the fuel gas supplier performs the constant quantity supply control and the circulation stop unit performs the circulation stop control.

When a time point of occurrence of a stop state of a fuel cell system is predicted during traveling, a drying state control that causes a fuel cell stack to transition to a dry state is started a predetermined time (a required drying time) before the predicted time point of occurrence of the stop state.