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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYoshio Moriwaki, Akira Iwase, Susumu Kitaoka, Isao Matsumoto
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A battery has elements for electromotive-force accommodated in a metal outer can which has a bottom having a cylindrical, prismatic or similar shape. The ratio of the bottom thickness (TA) the side thickness (TB) is 1.5-7.0. The metal outer can contains primarily iron and a layer of nickel is provided on at least the inner face of the battery. Shallow grooves are formed on the nickel layer perpendicular to the bottom face. An iron-based metallic sheet formed with a nickel layer on at least one face is subjected to drawing forming into a tubular shape having a bottom, continuous ironing processing being performed such that the side of the can formed in the tubular shape has an ironing ratio in the range of 20% to 90% and a metal outer can is thereby manufactured having a ratio of a bottom thickness to its side thickness from 1.5 to 7.0, having a cylindrical shape, prismatic shape or shape similar thereto, and with shallow longitudinal grooves formed in a nickel layer provided on the battery inside face.
A battery wherein elements for electromotive-force are accommodated in a metal outer can containing, primarily iron, said metal outer can comprising:
A battery wherein elements for electromotive-force are accommodated in a metal outer can containing primarily iron, said metal outer can comprising:
A method of manufacturing a casing for a rechargeable or secondary battery comprising the step of drawing thereby forming an iron-based metallic sheet having a nickel layer on at least one face while performing continuous ironing processing in a single step to form an elongate, hollow can having a cylindrical or prismatic shape, a bottom wall, a side wall, an ironing ratio in a range from 20% to 90%, a ratio of a thickness of said bottom wall of said can to a thickness of said side wall of said can being from 1.5 to 7.0, and shallow longitudinal grooves formed in the nickel layer, wherein said side wall of said metal can includes a first portion extending around a circumference of said metal can adjacent said sealing aperture and a second portion extending around the circumference of said metal can between said first portion and said bottom wall, said first portion of said side wall of said metal can having a uniform thickness at least 10% greater than a thickness of said second portion of said side wall of said metal can, and said ratio of thickness of said bottom wall to said thickness of said side wall applies to both said first portion of said side wall and said second portion of said side wall, respectively.
A battery in which elements for electromotive-force arc accommodated in a metal outer can containing primarily iron, said metal outer can comprising:
Dependencies are inferred from the claim text.