Battery Module and Battery Pack Including the Same

A battery module cooled by insulating oil, and a battery pack including the same, include a battery cell stack, in which a plurality of battery cells are stacked; electrode leads formed so as to protrude from the battery cells; a frame covering the upper, lower, left, and right surfaces of the battery cell stack; and end plates covering front and rear surfaces of the battery cell stack. Each of the battery cells have edge surfaces and flat surfaces. Space parts are defined between the edge surfaces and the frame and between the edge surfaces and the end plates. Insulating oil for cooling the plurality of battery cells is filled and flows in the space parts, and the insulating oil makes contact with the battery cells and the electrode leads.