To provide an electrical power system and an electrical power control device that make it possible to suppress deterioration of a fuel cell compared to that conventional seen. An electrical power system according to an embodiment includes a fuel cell, a heat source, a heat dissipator, and a controller. The fuel cell is configured to generate electrical power through electrochemical reactions to generate first heat. The heat source operates to generate second heat. The heat dissipator is configured to dissipate the first heat and the second heat. The controller is configured to control the fuel cell to allow, when the heat source is in operation, an amount of the first heat to be equal to or below an available heat dissipation capacity acquired by subtracting an amount of the second heat from a maximum amount of heat to be dissipated from the heat dissipator.

To provide an electrical power system and an electrical power control device that make it possible to suppress deterioration of a fuel cell compared to that conventional seen. An electrical power system according to an embodiment includes a fuel cell, a heat source, a heat dissipator, and a controller. The fuel cell is configured to generate electrical power through electrochemical reactions to generate first heat. The heat source operates to generate second heat. The heat dissipator is configured to dissipate the first heat and the second heat. The controller is configured to control the fuel cell to allow, when the heat source is in operation, an amount of the first heat to be equal to or below an available heat dissipation capacity acquired by subtracting an amount of the second heat from a maximum amount of heat to be dissipated from the heat dissipator.

An auxiliary power unit for an aircraft. It includes an air compressor coupled to an air-drawing device for drawing in air from outside the aircraft, the compressor supplying compressed air to a manifold. The manifold is configured to supply air to an environmental control system and a start-up module of at least one propulsion system of the aircraft running on hydrogen. The manifold is also configured to supply air to a fuel cell stack arranged to provide an electric generation function configured to power non-propulsive systems of the aircraft, the fuel cell stack also being supplied with hydrogen from a tank supplying hydrogen to the at least one propulsion system of the aircraft.

An auxiliary power unit for an aircraft. It includes an air compressor coupled to an air-drawing device for drawing in air from outside the aircraft, the compressor supplying compressed air to a manifold. The manifold is configured to supply air to an environmental control system and a start-up module of at least one propulsion system of the aircraft running on hydrogen. The manifold is also configured to supply air to a fuel cell stack arranged to provide an electric generation function configured to power non-propulsive systems of the aircraft, the fuel cell stack also being supplied with hydrogen from a tank supplying hydrogen to the at least one propulsion system of the aircraft.

Described herein is a fuel cell system that includes a radiator configured to exchange heat with coolant discharged from a fuel cell stack, a coolant supply pump configured to supply the coolant to the fuel cell stack, a COD heater configured to consume electric power generated by the fuel cell stack, a valve connected to the fuel cell stack, the radiator, the coolant supply pump, and the COD heater to control a flow of the coolant, and a controller configured to control an operating start time and output of the COD heater to consume energy generated by the fuel cell stack depending on a state of charge (SOC) of a battery and an operating state of the fuel cell stack. The controller controls the valve so that the coolant flows to the COD heater in a temperature control section after a cold start section of the fuel cell stack.

Described herein is a fuel cell system that includes a radiator configured to exchange heat with coolant discharged from a fuel cell stack, a coolant supply pump configured to supply the coolant to the fuel cell stack, a COD heater configured to consume electric power generated by the fuel cell stack, a valve connected to the fuel cell stack, the radiator, the coolant supply pump, and the COD heater to control a flow of the coolant, and a controller configured to control an operating start time and output of the COD heater to consume energy generated by the fuel cell stack depending on a state of charge (SOC) of a battery and an operating state of the fuel cell stack. The controller controls the valve so that the coolant flows to the COD heater in a temperature control section after a cold start section of the fuel cell stack.

Systems and methods for monitoring the isolation resistance of one or more fuel cells are described herein. In one example, a system includes a current transformer having a hollow core. First and second portions of a load line from a fuel cell are located within the hollow core. The first portion of the load line is electrically between an anode of a fuel cell and an electrical load, while the second portion of the load line being electrically between a cathode of the fuel cell and the electrical load. The current transformer is configured to output an electrical signal proportional to a current passing through the hollow core. This electrical signal can then be used to determine the isolation resistance of the fuel cell.

A fuel cell electric vehicle includes: a motor, a fuel cell stack and an integrated controller, which are accommodated in a PE room provided in a front of a vehicle body; a battery assembly including a high-voltage battery electrically connected to the motor and the fuel cell stack, and a low-voltage battery for supplying electric power to a vehicle electrical part; an IDC that is mounted between the PE room and the battery assembly, and electrically connects the high-voltage battery to the motor and the fuel cell stack; and a plurality of hydrogen tanks that is mounted at a rear of the battery assembly and below the vehicle body. In particular, the battery assembly is mounted at a rear of the PE room and below the vehicle body, and the IDC converts power of the high-voltage battery to be supplied to the low-voltage battery.

A fuel cell system includes: an external load connected to a fuel cell; an electric power adjusting unit configured to adjust a generated electric power of the fuel cell in accordance with electric power consumption of the external load; a humidity control unit configured to control humidity of an electrolyte membrane in the fuel cell on the basis of the generated electric power of the fuel cell; an output voltage detecting unit configured to detect an output voltage of the fuel cell; and a cross leakage determining unit configured to cause the humidity control unit to increase the humidity of the electrolyte membrane when the fuel cell generates the electric power, the cross leakage determining unit being configured to determine whether a cross leakage amount increases or not on the basis of a change in the output voltage at that time.

Provided is a warm-up apparatus for a fuel cell for an electrically driven vehicle in which a fuel cell and a secondary battery are mounted as power sources of a motor for travelling, and which, when charging of the secondary battery is required, stops operation of the fuel cell and charges the secondary battery with electric power from an external power source by means of a battery charger. The warm-up apparatus includes: a secondary battery cooling circuit that cools the secondary battery; a fuel cell cooling circuit that cools the fuel cell; a connection passage that connects the secondary battery cooling circuit and the fuel cell cooling circuit through a switching valve; and a warm-up control unit that, during charging of the secondary battery, controls the switching valve so that the secondary battery cooling circuit and the fuel cell cooling circuit communicate through the connection passage.