Novel methode of state-of-charge estimation using in-situ impedance measurement: Single cells in-situ impedance measurement based state-of-charge estimation for LiFePO4 - Li2TO3 Battery Cells with a real BMS. - Hannes Rathmann; Christoph Weber; Wolfgang Benecke; Joerg Eichholz; Dirk Kaehler (IECON, 2014)