BATTERY SYSTEM AND OPERATION METHOD THEREOF

A battery system according to an embodiment disclosed in this document includes a plurality of battery cells; a plurality of antennas correspondingly connected to the plurality of battery cells for each power transmission and reception of the plurality of battery cells, and different in pattern size from one another according to the corresponding battery cells; and a battery management device configured to control connections between the plurality of battery cells and the plurality of antennas based on each state of the plurality of battery cells and keep a state of charge (SoC) balance between the plurality of battery cells.