Importance

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Abstract

An algorithm extends the serviceable life of a Li Ion battery by charging a battery to a predetermined percentage of its rated charge capacity. The amount of energy impressed into the battery during charging is determined by periodically measuring the charge energy impressed at a given instance, and integrating the instantaneous energy measurements with respect to time over the charging period. Each time the battery is subsequently recharged, charging the battery to this same amount of energy provides the same amount of energy during discharge. Upon each subsequent recharge following the initial charge, the battery terminal voltage is slightly higher than at the end of the previous recharge. When the terminal voltage measured before the end of a recharge period exceeds the battery's rated voltage, the algorithm ends and indicates that the battery can no longer be used in the given application and should be replaced.

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First Claim