TRACTION BATTERY PACK IMMERSION THERMAL MANAGEMENT SYSTEM WITH A PLURALITY OF INLET APERTURES TO AN INTERIOR OF AN ENCLOSURE ASSEMBLY

A traction battery pack immersion thermal management system includes a coolant delivery system that communicates a coolant from a coolant supply to an enclosure assembly that houses a plurality of battery cells. The coolant delivery system includes a plurality of inlet apertures to the enclosure assembly. A coolant return system communicates the coolant from the enclosure assembly back to the coolant supply. The coolant return system including at least one outlet aperture from the enclosure assembly.