Fuel cell system and air vehicle

A fuel cell system for air vehicles,

• wherein the fuel cell system comprises a fuel cell, a battery, a motor and a controller;
• wherein the fuel cell and the battery are connected to the motor as independent power sources, and the motor includes a double three-phase winding that uses a double inverter;
• and
• wherein, when normal output is requested from the motor, the controller operates the motor by a predetermined first output from the fuel cell, and the controller charges the battery by a torque generated in the motor;
• wherein the fuel cell is a fuel cell stack which is a stack of two or more unit fuel cells;
• wherein the fuel cell stack comprises an end terminal, which is connected to the circuit, at both ends of the fuel cell stack, and the fuel cell stack comprises at least one reserve terminal, which is connectable to the circuit, at any position other than the both ends of the fuel cell stack;
• wherein the circuit comprises a switch;
• wherein the switch switches the circuit between the end terminal and the at least one reserve terminal;
• wherein the fuel cell system comprises a cell voltage sensor for measuring a voltage of each unit fuel cell of the fuel cell stack;
• and
• wherein the controller monitors the voltage of each unit fuel cell measured by the cell voltage sensor, and when the controller detects a voltage decrease of at least one unit fuel cell, the controller switches the switch to exclude the unit fuel cell from the circuit.