On a start of a fuel cell system, (i) when the temperature of a high-voltage secondary battery obtained from a temperature sensor is higher than a predetermined reference value, a controller of the fuel cell system is configured to set an output voltage on a step-down side of a DC-DC converter to a higher voltage than a voltage of a low-voltage secondary battery and subsequently start an FC auxiliary machine using electric power from the high-voltage secondary battery. (ii) When the temperature of the high-voltage secondary battery obtained from the temperature sensor is equal to or lower than the predetermined reference value, on the other hand, the controller of the fuel cell system is configured to set the output voltage on the step-down side of the DC-DC converter to a lower voltage than the voltage of the low-voltage secondary battery and subsequently start the FC auxiliary machine using the electric power from the high-voltage secondary battery.

A control method and system of a fuel cell system are provided. The control method includes draining the voltage of a fuel cell stack by charging a high voltage battery. In addition, the method includes draining the voltage of the fuel cell stack by connecting a fuel cell load device to the fuel cell stack, which is performed when the voltage of the fuel cell stack decreased by the first draining process is less than a predetermined first reference voltage.

Proposed is a fuel cell power control system. A fuel cell generates electric power. A load unit is electrically connected to the fuel cell. A DC/DC converter is disposed between the fuel cell and the load unit to convert the electric power between a low side of the DC/DC converter electrically connected to the fuel cell and a high side of the DC/DC converter electrically connected to the load unit. A battery is electrically connected to the high side of the DC/DC converter to be parallel to the load unit. A controller monitors a voltage of the load unit, the battery, or the high side of the DC/DC converter, and controls the electric power input to the load unit or output from the load unit in accordance with the monitored voltage.

A fuel cell including at least one sealing gasket (10), said sealing gasket (10) comprising a main body (12) and a heater member (14) having a heater element (16) and a power supply portion (18), the heater element (16) being embedded in the main body (12) and the power supply portion (18) being accessible from outside the main body (12).

A power conditioning system that includes a fuel cell to be connected to a load, a fuel cell converter connected between the fuel cell and the load, the fuel cell converter converting an output voltage of the fuel cell at a predetermined required voltage ratio, a battery connected in parallel with the fuel cell with respect to the load, the battery serving as a power supply source different from the fuel cell, a battery converter connected between the battery and the load, the battery converter converting an output voltage of the battery at a predetermined required voltage ratio. The power conditioning system includes a converter direct coupling unit configured to directly couple an input side and an output side of the fuel cell converter during startup of the power conditioning system and a fuel cell output voltage increasing unit configured to increase the output voltage of the fuel cell to a predetermined voltage by supplying oxidant gas during startup of the fuel cell.

A control method and system of a fuel cell system are provided. The control method includes draining the voltage of a fuel cell stack by charging a high voltage battery. In addition, the method includes draining the voltage of the fuel cell stack by connecting a fuel cell load device to the fuel cell stack, which is performed when the voltage of the fuel cell stack decreased by the first draining process is less than a predetermined first reference voltage.

A shut down system of a fuel cell vehicle includes: a fuel cell configured to output a high voltage; a rechargeable high voltage battery; a bidirectional converter arranged between an output terminal of the fuel cell and the high voltage battery; a first relay arranged between the fuel cell and the bidirectional converter; and a controller configured to control a voltage of the bidirectional converter when the fuel cell vehicle stalls to reduce a voltage of the output terminal of the fuel cell and turn off the first relay when a voltage value of the output terminal of the fuel cell is below a preset voltage reference value.

A drive system includes a drive device including an electric power generator; a fuel cell; a secondary battery; a fuel cell step-up converter including a diode; a relay connected to wiring between the fuel cell step-up converter and the drive device; a secondary battery step-up converter connected; a fuel cell voltage sensor; a secondary battery voltage sensor; and a controller. The controller stops the secondary battery step-up converter when a short-circuit fault of the diode is detected, disconnects the relay when a voltage of the fuel cell is higher than a voltage of the secondary battery after stopping the secondary battery step-up converter, and when the voltage of the secondary battery is higher than or equal to the voltage of the fuel cell, executes a voltage control process which increases the voltage of the fuel cell relative to the voltage of the secondary battery, and disconnects the relay.

Disclosed is a power control system and method of a fuel cell including a fuel cell that generates electricity; a load device that is electrically connected to the fuel cell; a DC/DC converter that is disposed between the fuel cell and the load device, and converts power between a low side of the DC/DC converter electrically connected to the fuel cell and a high side of the DC/DC converter electrically connected to the load device; a battery that is electrically connected to the high side of the DC/DC converter in parallel with the load device; and a controller that monitors a voltage of the high side of the DC/DC converter or a voltage of the low side of the DC/DC converter, and controls output power of the fuel cell or power consumption of the load device based on the monitored voltage of the high side or the monitored voltage of the low side.

Proposed is a fuel cell power control system. A fuel cell generates electric power. A load unit is electrically connected to the fuel cell. A DC/DC converter is disposed between the fuel cell and the load unit to convert the electric power between a low side of the DC/DC converter electrically connected to the fuel cell and a high side of the DC/DC converter electrically connected to the load unit. A battery is electrically connected to the high side of the DC/DC converter to be parallel to the load unit. A controller monitors a voltage of the load unit, the battery, or the high side of the DC/DC converter, and controls the electric power input to the load unit or output from the load unit in accordance with the monitored voltage.