Power supply system and method for controlling same

A power supply system that is mountable on a vehicle, the power supply system comprising:

• a lithium-ion storage battery connected to an electrical load via a first path and a second path;
• a power generator capable of charging the lithium-ion storage battery;
• a first switch provided on the first path;
• an electrical resistance element provided on the second path;
• and
• a controller configured to control on/off of the power generator and perform on/off control of the first switch,
• wherein, according to a voltage increase request from the electrical load, the controller is configured to turn of the first switch such that a power supply to the lithium-ion storage battery through the first path from the power generator is cut, and
• wherein the controller is configured to switch the power generator to a power generation mode in which an input voltage of the electrical load increases such that a power generated by the power generator is supplied to the lithium-ion storage battery through the second path.