SQUARE BATTERY

摘要

A square battery, comprising a battery case (1, 8), wherein four side plate parts (5, 6) of generally square shape in cross section are formed in arc shapes gently expanding outward with a radius of curvature (R1) and, where a distance between the center point (C2) of each of the side plate parts (5, 6) and the center point (C1) of the cross section of the battery case (1, 8) is (r9) and the radius of curvature is (R1), the cross section meets the requirement of an expression R1/r = 4 to 20, and the corner parts of the battery case (8) is formed in a round shape with a radius of curvature (R2) and, where a distance between the center point (C2) of each of the side plate parts (6) and the center point (C1) of the cross section of the battery case (8) is (r) and the radius of curvature of each corner part is (R2), the cross section meets the requirement of an equation R2/r = 0.3 to 0.8.