Sealed battery
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United States of America Patent
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Jul 27, 2004
Grant Date -
N/A
app pub date -
Nov 27, 2000
filing date -
Nov 25, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention provides a battery, in which swelling or expansion of side surface of a battery case when the battery is charged is reduced. The invention provides a sealed battery, accommodating a battery element of flat shape, said battery element comprising a positive electrode and a negative electrode being laminated on each other with a separator interposed between them and being wound together, characterized in that a recessed portion is formed on a side surface of a battery case running in parallel to a flat surface of the battery element, said recessed portion having a central axis running in parallel to said flat surface and being positioned on a surface passing through the center of the battery case and running perpendicularly to the surface in parallel to the flat surface of the battery element.
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