Electric double layer capacitor, control method thereof, and energy storage system using the same
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United States of America Patent
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Sep 16, 2008
Grant Date -
Nov 23, 2006
app pub date -
May 18, 2006
filing date -
May 20, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electric double layer capacitor is configured as follows. A changeover switch is connected to a positive electrode of the electric double layer capacitor, a power supply or electric load is connected to a terminal a of the changeover switch, and an auxiliary electrode is connected to a terminal b thereof through a resistor. The changeover switch is being switched to the terminal a, and discharge and charge of the electric double layer capacitor are repeated. When a discharge capacity becomes equal to or less than a lower limit threshold or an internal resistance becomes equal to or more than an upper limit threshold, the changeover switch is switched to the terminal b from the terminal a to make a channel between the positive electrode and the auxiliary electrode be a closed circuit through the resistor, and resistance discharge is conducted from the positive electrode.
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