Patent ID: 9498933
Filing Date: 2016-11-22
CPC Classification: B21D,B32B,C25C,C25D,H01M,Y02E,Y10T

Claim Text:
1. A surface-treated sheet of a battery can, comprising: a steel sheet; a first nickel layer formed on the steel sheet, wherein an orientation rate of the (200) plane with respect to the crystal plane orientations of the nickel layer is set to 5 to 30%; and a second nickel layer formed above or below the first nickel layer, the second nickel layer contacting the first nickel layer, an orientation rate of the (200) plane with respect to the crystal plane orientations of the second nickel layer being higher than that of the first nickel layer, wherein the first nickel layer and the second nickel layer are dull nickel plated, and wherein the first nickel layer or the second nickel layer, each having an upper surface, the entire upper surface of said first nickel layer or said second nickel layer is exposed as an outermost surface of the surface-treated sheet.