A molded cooling fin and frame is described. The molded cooling fin and frame includes a corrugated center cooling fin; a pair of outer cooling fins on opposite sides of the corrugated center cooling fin, each of the outer cooling fins having a ridge around an edge; and a frame covering an edge of each of the outer cooling fins, the frame sealed to the edge of each of the outer cooling fins. A battery pack including the molded cooling fin and frame and a method of making the molded cooling fin and frame are also described.