Numerical and experimental validation of a LiFePO4 battery model at steady state and transient operations

In the paper some of the battery models proposed in literature are analysed in order to predict the battery performance and, then, make sure that the Battery Management System (BMS) that is a key component to check and control the status of the batteries within their specified safe operating conditions, works in best conditions. In fact to reach an extended battery lifetime and increase the reliability of the system, is necessary to guarantee an accurate evaluation of the state of the whole stack of batteries to track their operations. Therefore, an accurate battery model that captures the dynamics of the battery is required. Lithium batteries are in particular considered because of their high energy density and long lifetime that make them increasingly used in systems such as electric vehicles, space and aircraft power systems and in the energy storage systems for distributed generation systems. In the paper the most interesting models of batteries proposed in literature are analysed and compared with the RC model of battery by means of numerical and experimental testing. The results are discussed in the paper.