HOUSING FOR MERCURY-FREE BUTTON CELLS
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United States of America Patent
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Issued Date -
Sep 5, 2013
app pub date -
Nov 22, 2011
filing date -
Nov 25, 2010
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of producing a bowl-shaped housing half-part provided with a copper alloy interiorly of the housing of a mercury-free button cell includes (1) providing a clad material with a layer of nickel, a layer of copper and an intermediate layer of steel or high-grade steel, which is provided on a copper side with an additional coating including at least one metal selected from the group consisting of tin, zinc, indium and bismuth, (2) shaping a bowl-shaped housing half-part made of the clad material, wherein the layer of nickel forms an outside portion and the additional coating forms an inside portion of the bowl-shaped housing half-part, and (3) heat treating the housing half-part at a temperature where the at least one metal selected from the group consisting of tin, zinc, indium and bismuth is alloyed with the copper of the copper layer.
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