A fuel cell vehicle according to the present disclosure includes, in a front room: a fuel cell stack fixed to an upper part of a stack frame; a high voltage element fixed to an upper part of the fuel cell stack; and an ion exchanger that is arranged in front of the fuel cell stack and the high voltage element. The stack frame is provided with an inclined part, and when the ion exchanger is displaced rearward at the time of a frontal crash of the fuel cell vehicle, a rear part in a lower end of the ion exchanger is slid along an inclined surface of the inclined part and the ion exchanger is displaced in a diagonally upward direction, whereby the cap part of the ion exchanger is positioned on the upper side in the vertical direction with respect to the high voltage element.

A fuel cell system and a method for purge and removing water during its stop and start process, the system comprises a fuel cell stack, an air supply system connected to a cathode at a cathode side of the fuel cell stack, and a hydrogen supply system connected to an anode at an anode side of the fuel cell stack, the air supply system includes an air compressor, an air inlet tube, and an air outlet tube, the air outlet tube is connected to a low-oxygen gas storage tank through a manifold, and the low-oxygen gas storage tank is connected back to the hydrogen supply system through a circulating tube. The method expels standing water from the fuel cell stack using an air compressor to continuously supply air to both the anode side and the cathode side of the fuel cell stack, so as to further protect the stack.

A fuel cell system and a method for purge and removing water during its stop and start process, the system comprises a fuel cell stack, an air supply system connected to a cathode at a cathode side of the fuel cell stack, and a hydrogen supply system connected to an anode at an anode side of the fuel cell stack, the air supply system includes an air compressor, an air inlet tube, and an air outlet tube, the air outlet tube is connected to a low-oxygen gas storage tank through a manifold, and the low-oxygen gas storage tank is connected back to the hydrogen supply system through a circulating tube. The method expels standing water from the fuel cell stack using an air compressor to continuously supply air to both the anode side and the cathode side of the fuel cell stack, so as to further protect the stack.

An apparatus and method for reducing an exhaust hydrogen concentration in a fuel cell system includes a first air cut-off valve (ACV) blocking ambient air supplied to a cathode, a second ACV blocking exhaust hydrogen discharged from the cathode, and an air suction valve (ASV) operating in a first mode connecting the cathode and an intake port of an air compressor and in a second mode blocking connection between the cathode and the intake port of the air compressor. The apparatus also includes a controller for operating the ASV in the first mode to store air of the cathode while the first ACV is opened and the second ACV is closed when hydrogen is supplied to an anode, and for operating the ASV in the second mode to discharge ambient air through an exhaust line while the first ACV is opened and the second ACV is opened when ambient air is supplied to the cathode.

The present disclosure relates to an apparatus and a method for controlling a concentration of exhaust hydrogen in a fuel cell system. The apparatus may include an air exhaust valve for discharging hydrogen from a cathode in a fuel cell stack to an outside environment through an air exhaust line, an air compressor for supplying ambient air to the air exhaust line, an air cut-off valve for blocking air supplied to the cathode, and a controller that opens the air exhaust valve and drives the air compressor when starting to supply hydrogen to the fuel cell stack, and opens the air cut-off valve such that a concentration of the hydrogen discharged from the cathode is reduced by air in the air exhaust line when the hydrogen supply is completed.

A plant includes a fuel supply line for supplying high-pressure fuel gas; and at least one expander disposed in the fuel supply line and configured to extract power from the high-pressure fuel gas by expanding the high-pressure fuel gas.

A fuel cell system having a fuel cell control module (FCU) and a method of controlling the same are provided. The method includes selecting one of at least one control parameter and learning system efficiency at each of at least one configurable candidate value of the selected control parameter based on supplied current by driving the fuel cell system. Additionally, the method includes determining a value of the selected control parameter by comparing the system efficiency at each of the at least one configurable candidate value of the selected control parameter with system efficiency corresponding to an initial performance index, at each of at least one predetermined representative current point. Thereby, efficiency of the fuel cell system is improved.

A fuel cell system and a control method thereof are provided. In the system, an oxygen sensor is mounted on the anode inlet side and the anode outlet side of a fuel cell stack to measure an oxygen concentration. Based on the measured oxygen concentration, a control operation is performed on the fuel cell system to reduce the oxygen concentration on the anode side. Accordingly, the irreversible deterioration of the fuel cell occurring due to the reverse voltage of the cell during driving of the fuel cell vehicle and the cathode carbon corrosion occurring due to the inflow of air during parking are effectively reduced, thereby increasing the durability of the fuel cell and the fuel cell vehicle.

A system and a method for estimating a hydrogen concentration of a fuel cell include the fuel cell, a discharge line connected to an outlet side of a fuel cell hydrogen electrode while connecting the fuel cell to an exterior of the fuel cell, for communication between the fuel cell and the exterior of the fuel cell, a discharge valve provided at the discharge line and configured to adjust the communication between the fuel cell and the exterior of the fuel cell, and a controller configured to cut off the discharge valve during operation of the fuel cell, to check occurrence of degradation of the fuel cell, and to correct a crossover coefficient value of the fuel cell in accordance with a level of the degradation in the fuel cell when the degradation of the fuel cell has occurred, estimating a hydrogen concentration in an interior of the fuel cell.

Methods for measuring and controlling the methanol concentration in a methanol fuel cell such as a direct methanol fuel cell or fuel cell stack are disclosed. Processors and memory storage containing programs which execute instructions to control the methanol concentration in the fuel cell or fuel cell stack are also disclosed.