Patent ID: 6777130
Filing Date: 2004-08-17
Classification: H01M,Y02E,Y02P

Abstract:
A prismatic battery comprising a prismatic tubular battery case (1, 8) for housing an electrode group (2) and electrolyte solution, with an open end of the battery case being sealed with a sealing member (4), whereinthe battery case (1, 8), being substantially square in cross section, has four lateral walls (5, 6) each being gradually arc-shaped to curve outwardly with a radius of curvature R1, and the cross section satisfies equation R1/r=4 to 20, where r is a distance between a midpoint (C2) of each lateral wall (5, 6) and a center point (C1) in the cross section of the battery case (1, 8) and R1 is the radius of curvature.