Electric energy storage device and method of charging and discharging the same
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United States of America Patent
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Feb 9, 2010
Grant Date -
Jan 17, 2008
app pub date -
Dec 13, 2003
filing date -
Dec 30, 2002
priority date (Note) -
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Abstract
Disclosed are an electric energy storage device having a good cycle characteristic and a temperature characteristic and a method of charging and discharging the electric energy storage device. The electric energy storage device including a capacitor and a secondary battery combined in series is provided. When the capacitor of the electric energy storage device is an electric double layer capacitor, the capacitor is used to the voltage of OV or less to increase an available energy usage.
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