LITHIUM ION SECONDARY BATTERY
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United States of America Patent
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Issued Date -
Dec 1, 2016
app pub date -
May 17, 2016
filing date -
Jun 1, 2015
priority date (Note) -
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Abstract
Provided is a lithium ion secondary battery that includes a package housing a positive electrode, a negative electrode, a separator, and an electrolyte solution. In the lithium ion secondary battery: the package including a stack including a metal base material, an acid modified polypropylene layer, and a polypropylene layer stacked sequentially; the polypropylene layer forms an inner surface of the package; the package includes a heat-sealed portion and a non-sealed portion; and the thickness of one acid modified polypropylene layer included in the heat-sealed portion is smaller than a half of the thickness of the polypropylene layer included in the heat-sealed portion.
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