Method and system for estimating state of charge of a lithium electrochemical cell having a lithium phosphate type positive electrode
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United States of America Patent
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Apr 19, 2016
Grant Date -
Sep 5, 2013
app pub date -
Mar 1, 2013
filing date -
Mar 2, 2012
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Abstract
A method and system are provided for estimating state of charge of a cell having a positive electrode, for example of a lithium phosphate type, the charge profile of which includes a range of state of charge between about 30 and about 90% in which variation of voltage is 10 times less rapid than for a state of charge higher than 90%. Determination of state of charge for a state of charge greater than 90% is based on either the use of a calibration relationship between cell voltage and state of charge when a current is passing through the cell that is less than a predetermined threshold value and its voltage has stabilized, or on the use of coulometry the result of which is corrected taking into account the accuracy of the current sensor.
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