Upper box body structure and power battery pack

The utility model relates to the technical field of new energy automobiles, and discloses an upper box body structure and a power battery pack. An inner cavity of the upper box body structure is used for containing a blade battery cell, a plurality of longitudinal concave areas and a transverse concave area penetrating through the longitudinal concave areas are arranged on the top surface of the upper box body structure, and the transverse concave area and the longitudinal concave areas divide the top surface of the upper box body structure into a plurality of convex areas; the front side face of the upper box body structure is provided with an avoiding hole and a first flange arranged on the periphery of the avoiding hole in a surrounding mode, the first flange is used for being connected with a front end panel of the connector, the bottom face of the upper box body structure is provided with a second flange, the second flange is used for being connected with the lower box body structure, and the left side f