Electric energy storage device
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United States of America Patent
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Oct 4, 2011
Grant Date -
Feb 3, 2011
app pub date -
Apr 15, 2009
filing date -
Apr 16, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Provided is an electric energy storage device capable of improving a charging efficiency when electric power supplied with an input current having a current value repeatedly exhibiting peaks and valleys is to be storaged by using a secondary battery and an electric double-layer capacitor. The electric energy storage device includes: an electric double-layer capacitor; and a battery unit including at least one secondary battery, the battery unit being connected in parallel to the electric double-layer capacitor, in which: a ratio of an internal resistance of the electric double-layer capacitor to an internal resistance of the battery unit is determined according to parameters relating to the input current.
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