Pouch-type secondary battery having sealing margin for improved durability
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United States of America Patent
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Nov 10, 2015
Grant Date -
Dec 4, 2014
app pub date -
Jul 11, 2014
filing date -
Dec 24, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Disclosed is a pouch-type secondary battery having a sealing margin for improved durability, including a sealing area formed by melting sealing layers of an upper pouch film and a lower pouch film along edges of a pouch casing, characterized in that a sealing margin is greater than a movement distance of a sealing residue flowing out of the sealing area, the sealing margin being a distance measured from an intersection point of a first straight line and a second straight line to a boundary line of the sealing area, the first straight line extending horizontally from a surface of the sealing area, when viewed in cross section of the secondary battery, and the second straight line corresponding to a tangent line having an average gradient among possible tangent lines at each point on a cross-sectional slope line of the pouch casing adjacent to the sealing area.
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