Rechargeable battery pack
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United States of America Patent
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Sep 10, 2002
Grant Date -
Jan 3, 2002
app pub date -
Jun 28, 2001
filing date -
Jun 29, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A rechargeable battery pack has a battery voltage detector, a full charge detecting circuit detecting a full charge state, a switch interposed in a charge current circuit that opens the charge current circuit when detecting a fall charge state, a memory for storing a closed circuit voltage immediately before the charge current circuit is opened, an internal resistance detection circuit for finding a value corresponding to an internal resistance of the rechargeable battery cell from an open circuit voltage and the closed circuit voltage stored in the memory after the charge current circuit is opened, and a lifetime indicator to predict lifetime. This enables accurate determination of the lifetime of the rechargeable battery cell under stable conditions without wastefully consuming the charging capacity.
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