Surface-treated steel sheet for battery containers

A battery container, comprising:

• a bottomed cylindrical shaped article made of a surface-treated steel sheet, wherein the surface-treated steel sheet comprises:
• a steel sheet;
• an iron-nickel diffusion layer formed on the steel sheet;
• and
• a nickel layer formed on the iron-nickel diffusion layer and constituting the outermost layer, the nickel layer consisting of nickel,
• wherein when the Fe intensity and the Ni intensity are continuously measured from the surface of the surface-treated steel sheet for a battery container along the depth direction with a high frequency glow discharge optical emission spectrometric analyzer, the thickness of the iron-nickel diffusion layer being the difference (D2−D1) between the depth (D1) at which the Fe intensity exhibits a first predetermined value and the depth (D2) at which the Ni intensity exhibits a second predetermined value is 0.04 to 0.31 μm,
• wherein the total amount of the nickel contained in the iron-nickel diffusion layer and the nickel contained in the nickel layer is 10.8 to 26.7 g/m2,
• wherein the depth (D1) exhibiting the first predetermined value is the depth exhibiting an intensity of 10% of the saturated value of the Fe intensity measured by the above-described measurement,
• wherein the depth (D2) exhibiting the second predetermined value is the depth exhibiting an intensity of 10% of the maximum value when the measurement is further performed along the depth direction after the Ni intensity shows the maximum value by the above-described measurement, and
• wherein the iron-nickel diffusion layer is disposed on an inner surface of the bottomed cylindrical shaped article.