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AssigneeToyo Kohan Co., Ltd.
InventorsHitoshi Ohmura, Tatsuo Tomomori, Hideo Ohmura, Tatsuya Ohshima
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A purpose of the present invention is to provide a surface treated steel sheet for a battery container having an excellent anti-alkaline characteristic and a performance for maintaining a discharging level for a long time, a battery container and a product method thereof. In the present invention, after forming a nickel-bismuth alloy layer on a steel sheet, the steel sheet is thermally treated at 300° C. to 650° C. in an inactive gas or a deoxidizing gas for 240 to 600 min so that an iron-nickel diffused layer and nickel-bismuth diffused layer are formed at each boundary surface. A battery is produced by utilizing a battery container made of a steel sheet on which one or more than layers selected from a group of an iron-nickel diffused layer, a nickel layer, a nickel-bismuth diffused layer, an iron-nickel-bismuth alloy layer is formed on the steel sheet.
A surface treated steel sheet for a battery container wherein a nickel-bismuth alloy layer is formed on at least one surface of said surface treated steel sheet, said surface treated steel sheet characterized in that said nickel-bismuth alloy layer is a diffused layer.
A battery container comprising a steel sheet defining an inner surface of the battery container, wherein a nickel-bismuth alloy layer is formed on the inner surface of said battery container, said surface treated steel sheet characterized in that said nickel-bismuth alloy layer is a diffused layer.
A surface treated steel sheet for a battery container, said surface treated steel sheet characterized in that an iron-nickel diffused layer is formed at a side of said steel sheet adapted to become an inner side of the battery container, and a nickel layer is formed at an inner side of the diffused layer.
A method for producing a steel sheet for a battery container, said method is characterized in that a nickel-bismuth alloy layer is formed on said steel sheet and thermally treated at 300 to 650° C. in an atmosphere of inactive gas or dioxide gas for 240 to 600 min so as to form an iron-nickel diffused layer and a nickel-bismuth diffused layer at each boundary portion.
A battery including a container made of a steel sheet wherein one or more than one layer selected from the group consisting of a nickel-bismuth diffused layer and an iron-nickel-bismuth alloy layer is formed on said steel sheet.
Dependencies are inferred from the claim text.