TRACTION BATTERY PACKS WITH SECOND TIER INTEGRATED SUPPORTING, THERMAL, AND SEALING STRUCTURES

This disclosure details exemplary battery pack designs, such as those designed for use within electrified vehicles. Exemplary battery packs may include an enclosure assembly and a plurality of battery arrays housed inside the enclosure assembly. The enclosure assembly may include a mid-tray that is configured for supporting, cooling/heating, and sealing second tier battery arrays. The configuration of the mid-tray allows coolant joints to be eliminated inside of the battery pack.