Characterisation and modelling Lithium Titanate Oxide battery cell by Equivalent Circuit Modelling Technique

Abstract

Lithium Titanate Oxide (L TO) battery cells have immense potential as energy storage systems in large-scale stationary grid applications due to their better cycling performance, lower self-discharge and higher safety margins compared to other Lithium based battery chemistries. Hence, accurate L TO performance models at various operating conditions are required for different purposes like determination of their dynamic behaviour, modelling LTO's suitability to an application as well as to the development of battery and energy management systems (BMS and EMS). L TO battery cell performance is mainly affected by parameters such as, state of charge (SOC) and temperature. Hence, in this paper, second order equivalent circuit model (ECM) of an L TO cell will be developed based on their experimental characterisation at different SoC's (every 10% intervals) and temperatures (15 °C, 25 °C, 35 °C and 45 °C), Modified version of the Hybrid pulse power characterisation (HPPC) test method will be utilised for parametrisation of the ECM of 2.9 Ah L TO cell. The simulation model will be developed in Matlab/Simulink platform and compared with the laboratory measurements for ECM validation.