Charging controlling device

A charging control device comprising:

• one or more slave groups including a plurality of slaves for charging or discharging a battery;
• and
• a master configured to transmit, to the one or more slave groups, a control signal for controlling operations of the one or more slave groups, and select one of a plurality of slaves included in each of the one or more slave groups as an alternative master,
• wherein the alternative master is a slave capable of performing at least some functions of the master, the at least some functions comprising a function for detecting whether an overload of a slave occurs, and
• wherein, when an alternative master among a plurality of alternative masters detects an overload of a slave included in another slave group, the alternative master detecting the overload of the slave transmits information on the overload occurring slave to another alternative master or the master.