Method for charging and discharging battery based on charging capacity
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United States of America Patent
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Jun 29, 2004
Grant Date -
Apr 24, 2003
app pub date -
Oct 22, 2002
filing date -
Oct 23, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A nonaqueous-electrolyte secondary battery charging/discharging method that provides a prolonged cyclic life. In the charging/discharging method, a secondary battery is continuously charged unconditionally until a charging capacity exceeds 20% of a full charging capacity. The charging is completed when the charging capacity exceeds 70% of a full charging capacity. A maintenance charging/discharging operation is performed to avoid the full charging capacity being in an error state when dV/dt exceeds a specified value 'a' before a charging current exceeds 70% of the full charging capacity. Likewise, the maintenance charging/discharging operation is performed to avoid the full charging capacity being in an error state when dT/dt exceeds a specified value 'b' before a charging current exceeds 70% of the charging capacity.
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