Battery tray and battery container including the same

A battery container, comprising:

• a battery tray including:
• i) an upper plate defining a plurality of openings each configured to accommodate a battery, ii) a plurality of lower surfaces respectively corresponding to the openings, and iii) a plurality of lateral surfaces respectively connecting the openings in the upper plate to the lower surfaces, wherein each of the lower surfaces respectively meets an end of the lateral surface at an obtuse angle along, the entire respective lower surface, wherein each of the plurality of lateral surfaces is elastic or flexible, and wherein the upper plate comprises a plurality of wings protruding outward from edges thereof and wherein the upper plate, the lower surfaces, the lateral surfaces, and the wings are formed as a single piece;
• and
• an outer box including an outer lower surface and outer lateral surfaces accommodating the battery tray, wherein the outer lateral surfaces:
• i) are connected to the outer lower surface, ii) are substantially perpendicular to the outer lower surface, and iii) define a plurality of penetration holes or grooves respectively accommodating the wings.