Apparatus and method for controlling turn-on operation of switch units included in parallel multi-battery pack

A turn-on operation control apparatus of a switch unit included in a parallel multi battery pack, which controls a turn-on operation of switches included in first to nth battery packs connected in parallel through a parallel link node, the turn-on operation control apparatus comprising:

• first to nth switches respectively installed on power lines of the first to nth battery packs;
• first to nth current sensors connected to the switches respectively installed on the power lines of the first to nth battery packs to measure currents flowing through the corresponding switches;
• first to nth voltage sensors respectively coupled to the first to nth switches to measure both-end voltages of the corresponding switches;
• and
• a processor operatively coupled to the first to nth switches, the first to nth current sensors and the first to nth voltage sensors,
• wherein the processor is configured to:
• connect the first to nth battery packs in parallel by turning on the first to nth switches according to a preset turn-on sequence before charging or discharging of the parallel multi battery pack is initiated,
• receive a switch voltage value from a voltage sensor coupled to a kth sequence switch (k is a turn-on sequence index, which is a natural number of 2 to n) before turning on the kth sequence switch, then turn on the kth sequence switch, subsequently receive a switch current value from a current sensor connected to the kth sequence switch, and count a watt energy value consumed in the kth sequence switch from the switch voltage value and the switch current value, and
• determine the turn-on sequence of the first to nth switches in descending order from a switch having a greatest watt energy count value by referring to watt energy count values respectively corresponding to the first to nth switches before charging or discharging of the parallel multi battery pack is initiated.