Fuel cell control device, control method thereof, and fuel cell vehicle

A fuel cell control device comprising:

• a fuel cell system having a fuel cell and a secondary battery;
• and
• a controller configured to control the fuel cell system, wherein:
• the controller is configured to determine whether or not a state of charge of the secondary battery is equal to or lower than a threshold which is set to a first threshold value obtained by adding an addition value to a lower limit at which electric power required to stop and start the fuel cell system is supplied, the addition value being set to a first predetermined value;
• in a case where the controller receives a command to stop the fuel cell system and determines that the state of charge of the secondary battery is equal to or lower than the threshold, the controller is configured to control the fuel cell system to perform a first forced charging of the secondary battery by the fuel cell until the state of charge reaches the threshold;
• the controller is configured to stop the fuel cell system after the first forced charging is performed;
• and
• after the fuel cell system is stopped, in a case where (i) the fuel cell system is started based on a request for starting the fuel cell system within a predetermined period and (ii) the controller receives the command to stop the fuel cell system within the predetermined period, the controller is configured to:
• set the threshold to a second threshold value obtained by adding the addition value, which is set to a second predetermined value lower than the first predetermined value, to the lower limit, and
• control the fuel cell system to perform a second forced charging of the secondary battery by the fuel cell if the state of charge of the secondary battery is equal to or lower than the threshold after being set to the second threshold value.