Sealed prismatic battery
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United States of America Patent
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Jul 13, 2010
Grant Date -
May 3, 2007
app pub date -
Oct 30, 2006
filing date -
Oct 31, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
There is provided a sealed prismatic battery having an opening vent excellent in reliability with use of a deformed state of a battery casing on occasion of abnormal increase in internal pressure of the battery.The battery casing is shaped like an oval quadrangle having a width in a direction of thickness smaller than a height in a longitudinal direction and a length in a lateral direction, and side walls of the casing that face in the lateral direction swell outward in the lateral direction so as to form circular-arc shapes in general. The opening vent is composed of a groove formed as a recess on the side wall. A distances from the upper end of the battery casing to the groove is set between 3 and 20% of the longitudinal height of the battery casing.
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