A power supply system includes a fuel cell, a power storage, and a processor. The fuel cell and the power storage supply electric power to a load. The processor is configured to control the fuel cell and the power storage. The processor is configured to acquire a required system power that is required in the power supply system. The processor is configured to determine a power storage shared power such that power efficiency of the electric power supplied from the power storage to the load is equal to or higher than a first value. The processor is configured to determine a fuel cell shared power such that the electric power supplied from the fuel cell is a difference between the power storage shared power and the required system power.

A fuel cell system includes a cooling fan that cools a coolant, a pump that pumps the coolant, and a controller communicatively connected with the cooling fan and the pump. The controller retrieves a preset cooling-fan RPM and a preset pump RPM, optimizes the cooling-fan RPM and the pump RPM through a decrease of the cooling-fan RPM and an increase of the pump RPM such that a coolant temperature at an inlet of a fuel cell stack satisfies a specified temperature condition and a total power consumption is minimized, the total power consumption being a sum of a power consumption corresponding to the cooling-fan RPM and a power consumption corresponding to the pump RPM, and stores the optimized cooling-fan RPM and the optimized pump RPM. Besides, it may be permissible to prepare various other embodiments speculated through the specification.

A vehicle includes first and second fuel-cell stacks, a first coolant circuit having conduit arranged to circulate coolant through the first fuel-cell stack, a second coolant circuit having conduit arranged to circulate coolant through the second fuel-cell stack, a heater in fluid communication with at least the first coolant circuit, and an isolation valve assembly configured to proportion a flow of coolant between the first and second coolant circuits. The isolation valve assembly includes valving. The valving has an isolation position in which the first and second circuits are isolated. The valving also has at least one mixing position in which the first and second circuits are in fluid communication.

A fuel cell module is configured or operated, or both, such that after a shut down procedure a fuel cell stack is discharged and has its cathode electrodes at least partially blanketed with nitrogen during at least some periods of time. If the fuel cell module is restarted in this condition, electrochemical reactions are limited and do not quickly re-charge the fuel cell stack. To decrease start up time, air is moved into the cathode electrodes before the stack is re-charged. The air may be provided by a pump, fan or blower driven by a battery or by the flow or pressure of stored hydrogen. For example, an additional fan or an operating blower may be driven by a battery until the fuel cell stack is able to supply sufficient current to drive the operating blower for normal operation.

An electric power adjustment system includes: a power storage system that is configured to store electric power; a reversible fuel cell system that is configured to generate electric power through a chemical reaction in a fuel cell using hydrogen which is supplied from a hydrogen station configured to store hydrogen and supply the generated electric power to the power storage system and that is configured to produce hydrogen through water electrolysis in the fuel cell and supply the produced hydrogen to the hydrogen station; a power adjustment device that is configured to adjust a flow of electric power which is exchanged between the power storage system and the reversible fuel cell system; and a power management device that is configured to manage the flow of electric power in the power adjustment device.

During performance of low efficiency power generation, a control device controls the flow rate of feed of the oxidizing agent gas so that the amount of heat generation of the fuel cell accompanying power generation loss becomes a first amount of heat generation when the state of a mount on which the fuel cell system is mounted is a first mode and controls the flow rate of feed of the oxidizing agent gas so that the amount of heat generation becomes a second amount of heat generation smaller than the first amount of heat generation when the state of the mount is a second mode where the generated electric power of the fuel cell fluctuates more easily compared with the first mode.

The control device is provided with a power generation part configured to be able to selectively perform normal power generation and low efficiency power generation in which the power generation loss is greater compared with normal power generation when there is a request for warmup of the fuel cell. The power generation part temporarily stops the low efficiency power generation and performs normal power generation when during performance of the low efficiency power generation the target generated electric power of the fuel cell becomes equal to or greater than a predetermined first switching electric power.

According to an embodiment, a control system includes a fuel cell configured to generate electric power using an anode and a cathode, a power storage device capable of storing the electric power generated by the fuel cell, auxiliary equipment to which the electric power is able to be supplied, and a controller configured to control operations of the fuel cell and the auxiliary equipment. The controller performs control so that the electric power is consumed by the auxiliary equipment in accordance with a power storage state of the power storage device at the time of power generation of the fuel cell and adjusts one or both of a timing and a degree at which electric power to be consumed by the auxiliary equipment is limited on the basis of temperature information associated with the auxiliary equipment.

A fuel cell system includes a sensor device that measures a coolant temperature at an inlet of a fuel cell and an outside-air temperature, a cooling fan that cools a coolant, and a cooling fan controller connected with the sensor device and the cooling fan. The cooling fan controller determines an RPM of the cooling fan, based on the outside-air temperature and an output value of the fuel cell and corrects the RPM of the cooling fan, based on the coolant temperature at the inlet of the fuel cell.

The power supply device is configured on an aircraft and includes a secondary battery, a transformer, a fuel cell and a bypass switch. The transformer is electrically connected between the secondary battery and the aircraft. The fuel cell is suitable for providing a first output current to the aircraft. The bypass switch is connected in parallel with the transformer. The transformer has a first output voltage set value. When a first output terminal voltage of the fuel cell is lower than the first output voltage set value and the bypass switch is in a non-conducting state, a second output current of the secondary battery is provided to the aircraft via the transformer. When the first output terminal voltage is lower than the first output voltage set value and the bypass switch is in a conducting state, the second output current is provided to the aircraft via the bypass switch.