BATTERY PACK HOUSING

A battery pack housing for an automotive vehicle is disclosed. The battery pack housing includes a bottom plate shaped of a plate fabricated by extrusion molding to form an upper plate and a lower plate integrated into a single body and including a throughhole passing through the inside of the bottom plate in a direction parallel with a plate surface from a region of the upper plate or the lower plate; a first sidewall coupled to one edge of the bottom plate so as to come into contact with a first end of the throughhole and including a first hollow and a first communicating hole formed therein, the first hollow passing through the inside of the first sidewall in a lengthwise direction of the first sidewall and the first communicating hole connecting the throughhole of the bottom plate and the first hollow; a second sidewall coupled to the other edge of the bottom plate so as to come into contact with a second end of the throughhole, the second end opposing the first end, and including a second hollow and a second communicating hole formed therein, the second hollow passing through the inside in a lengthwise direction of the second sidewall and the second communicating hole connecting the throughhole of the bottom plate and the second hollow; an inlet formed in the first sidewall or the second sidewall and allowing cooling water to be injected into the first hollow or the second hollow; and; an outlet formed in the first sidewall or the second sidewall and allowing the cooling water to be discharged from the first hollow or the second hollow to the outside.