Fuel cell system and electric vehicle having the system

A fuel cell system comprising:

• a fuel cell configured to react hydrogen gas with oxygen gas to generate electric power, the hydrogen gas supplied from a hydrogen cylinder through a hydrogen supply line;
• an operating device configured to operate using electric power generated at least in part by the fuel cell;
• a secondary power storage device operatively connected to the fuel cell, the secondary power storage device charged with electric power generated at least in part by the fuel cell;
• a recirculation line coupled to the hydrogen supply line at a junction and coupled to the fuel cell, the recirculation line configured to return unreacted hydrogen gas discharged by the fuel cell back to the fuel cell via the hydrogen supply line;
• a power supply system control device;
• and
• a valve disposed upstream of the junction between the recirculation line and the hydrogen supply line, the valve being controlled by the power supply system control device and selectively moveable to an open position to allow flow of hydrogen gas from the hydrogen gas cylinder to the fuel cell, the valve further selectively moveable to a closed position to allow decoupling of the hydrogen cylinder from the hydrogen supply line, the recirculation line directing unreacted hydrogen gas therein to the fuel cell to exhaust said unreacted hydrogen gas and further generate electric power with the valve in the closed position.