Electrified vehicle and power source management method therefor

A method of power source management of an electrified vehicle, the method comprising:

• connecting a swappable battery unit to a connector in an electrified vehicle,
• wherein:
• the electrified vehicle comprises:
• a first battery fixedly arranged with a main battery unit;
• a first battery management system configured to control the first battery;
• and
• a DC converter having a first end and a second end and electrically connected in series with the main battery unit at the first end,
• the swappable battery unit comprises:
• a second battery;
• and
• a second battery management system configured to control the second battery, and
• the connector is provided at the second end of the DC converter;
• determining, using a vehicle control unit, a target integrated voltage to be supplied to a power electric unit, comprising an inverter and a motor based on first battery information on the first battery and second battery information on the second battery;
• and
• transmitting, using the vehicle control unit, a voltage command corresponding to a target output voltage to be output by stepping up or stepping down a voltage of the second battery, at the second end of the DC converter, to the DC converter, according to a determined target integrated voltage.