Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Jun Ho Kim0
Date of Patent
April 14, 2009
0Patent Application Number
109657340
Date Filed
October 18, 2004
0Patent Primary Examiner
Patent abstract
A lithium ion secondary battery in which a safety vent as a safety device for a swelling phenomenon functions under a low pressure. A notch is formed in an inner surface of a large-area wall of the secondary battery, and an auxiliary notch is formed in an outer surface to correspond to the notch formed in the inner surface.
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