A battery unit module and a battery module package including the battery unit module are disclosed. The battery unit module includes: a secondary battery; a unit case accommodating the secondary battery; and an electrode terminal electrically coupled to the secondary battery, the electrode terminal including a positive electrode terminal and a negative electrode terminal, and exposed outside of the unit case, wherein the positive electrode terminal and the negative electrode terminal have cross-sections that are asymmetrical with respect to each other, and wherein a securing means is formed on at least one of the positive electrode terminal and the negative electrode terminal.