Cooling structure of vehicle battery unit

A cooling structure of a vehicle battery unit comprising:

• at least two battery modules, arranged side by side in a vehicle width direction;
• a battery cooling unit, disposed below the at least two battery modules in a vertical direction, the battery cooling unit having a refrigerant passage through which refrigerant passes;
• an electric connection box, arranged on one side of the at least two battery modules in a front-rear direction;
• a battery case, accommodating the at least two battery modules, the battery cooling unit and the electric connection box;
• a supply pipe, accommodated in the battery case, the supply pipe configured to introduce refrigerant from the outside of the battery case to the battery cooling unit;
• and
• a discharge pipe, accommodated in the battery case, the discharge pipe configured to discharge the refrigerant from the battery cooling unit to the outside of the battery case, wherein:
• the supply pipe includes:
• a first supply pipe portion passing between a battery module of the at least two battery modules, which is the battery module located on one side in the vehicle width direction, and the electric connection box;
• and
• a second supply pipe portion passing between the at least two battery modules;
• and
• the discharge pipe includes:
• a first discharge pipe portion passing between a battery module of the at least two battery modules, which is the battery module located on the other side in the vehicle width direction, and the electric connection box;
• and
• a second discharge pipe portion passing between the at least two battery modules.