BATTERY RACK HAVING WIRELESS COMMUNICATION OPTIMIZATION STRUCTURE AND ENERGY STORAGE SYSTEM INCLUDING THE SAME

A battery pack includes a rack housing having a cabinet and a door provided to open and close the cabinet; a plurality of battery modules disposed in the cabinet in a layered form; a plurality of slave modules mounted to the battery modules one by one and having a slave antenna for wireless communication; a master module disposed at one of interlayer, top and bottom of the plurality of battery modules and having a master antenna for wireless communication; and a waveguide installed at an inner surface of the door to form a wireless communication path between the plurality of slave modules and the master module.