Patent ID: 8828569

Claim:
A battery can for a storage battery, comprising: a tubular can body portion having a first end and a second end; a can bottom portion that is continuous to the can body portion so as to cover the first end of the can body portion; and a can lid portion that is continuous to the can body portion so as to cover the second end of the can body portion when constituting a battery, wherein a safety valve having a first score groove portion and a second score groove portion that are opposite to each other in a cross-sectional view in a sheet thickness direction is provided to an inner surface and an outer surface of any one of the can bottom portion, the can body portion, and the can lid portion, when viewed from a cross-section that is perpendicular to an extension direction of the first score groove portion, the first score groove portion and the second score groove portion have a first score groove bottom portion and a second score groove bottom portion, which have a radius of curvature R and a relative clearance, wherein the relative clearance is 0.045 mm to 0.150 mm, wherein the radius of curvature R is more than 0.20 mm and is equal to or less than 1.20 mm, and any one of the can bottom portion, the can body portion, and the can lid portion, which has the safety valve, is constituted by a plated steel sheet having a steel sheet portion in which the amount of C is limited to 0.040% by mass or less and the amount of S is limited to 0.020% by mass or less, and a tensile strength TS is 400 MPa or less, and a plate layer formed on the steel sheet portion.