Vehicular battery system and method of controlling balancing thereof

A vehicular battery system comprising:

• a plurality of single-phase battery systems,
• wherein each of the plurality of single-phase battery systems includes a plurality of battery modules,
• wherein the plurality of battery modules include a combination of a first battery module and a second battery module,
• wherein each of the first battery module and the second battery module includes a battery, an inverter including AC module output terminals outputting an AC module voltage from a voltage of the battery, and a DC/DC converter including DC module output terminals outputting a DC module voltage from a voltage of the battery,
• wherein the DC/DC converter disposed in the first battery module includes a step-down converter including first DC module output terminals, stepping down a voltage of the battery to a first DC module voltage and outputting the first DC module voltage, and
• wherein the DC/DC converter disposed in the second battery module includes a step-up converter including second DC module output terminals, stepping up a voltage of the battery to a second DC module voltage and outputting the second DC module voltage.