Charging regime at any state of charge using the first derivative of temperature and the first and second derivative of voltage with respect to time
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United States of America Patent
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Issued Date -
Jul 10, 2008
app pub date -
Jan 9, 2007
filing date -
Jan 9, 2007
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Abstract
A battery control module for a rechargeable battery includes a voltage measuring module that measures a voltage of the rechargeable battery and that estimates a first derivative of the voltage with respect to time (dV/dt) and a second derivative of the voltage with respect to time (d.sup.2V/dt.sup.2). A charge control module estimates a maximum charging current based on dV/dt. A current control module limits a charging current of the rechargeable battery to the maximum charging current and turns off the charging current when d.sup.2V/dt.sup.2 is greater than dV/dt.
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