BATTERY PACK HAVING IMPROVED UNIFORMITY IN THE DISTRIBUTION OF REFRIGERANT

摘要

The present invention relates to a battery pack including a plurality of battery cells or unit modules ("unit cells") electrically connected to each other. Here, the unit cells are vertically arranged in the width direction (transverse direction) of the battery pack with the unit cells are spaced apart from each other so as to form a refrigerant passage, thereby forming one battery module layer. A stacked structure in which two or more battery module layers are arranged in the height direction (longitudinal direction) of the battery pack is built into a pack case. The battery pack includes a refrigerant inflow part in which the refrigerant is simultaneously fed into the two or more battery module layers, and a refrigerant discharge part through which the refrigerant passing through the unit cells is discharged, such that a portion of the unit cells or all of the unit cells are disposed in the two or more battery module layers.