Simple Calibration Circuit Maximizes Accuracy in Li-Ion Battery

InLi-Ionbatterysystemsitisimportanttomatchthe

chargeconditionofeachcelltomaximizepackperformance

andlongevity.Celllifeimprovesbyavoidingboth

deepdischargeandovercharge,sotypicalsystemsstrive

foroperationbetween20%and80%statesofcharge

(SOC).Detectionandcorrectionofchargeimbalances

assuresthatallcellstrackwithinthedesiredSOCwindow,

preventingprematureagingofsomecellsthatcould

compromisetheentirepackcapacity.Highlyaccurate

measurementsarerequiredtodetermineSOCwithLi-Ion

cellsduetotheirexceptionallyflatdischargecharacteristics,

particularlywiththelowervoltagechemistries

SimpleCalibrationCircuitMaximizesAccuracyinLi-IonBatteryManagementSystemsDesignNote471JonMunsonIntroductionSi2351DS1LT1461AIS8-3.38InLi-Ionbatterysystemsitisimportanttomatchthechargeconditionofeachcelltomaximizepackperfor-27VINmanceandlongevity.CelllifeimprovesbyavoidingbothLTC6802IG-21M