A model for battery lifetime calculation implementable in circuit simulators

For pure electrical propelled vehicles, PEVs, a proper battery model is critical in order to estimate State of Charge, SOC, therefore enabling predicting performance and ensuring safe battery operation. Present methods can be classified as electrochemical, electrical equivalent circuits, stochastic and analytical, these last ones based on solution of Partial Differential Equations. These methods are somehow computationally intensive, prejudicing their application in Battery Management Systems. Some ones do not accurately predict battery SOC and most of them are not applicable in electrical circuit simulators. This paper presents a model, based on Fick's laws, capable of an accurate prevision of battery lifetime, i.e. time until battery is empty, and implementable in any circuit simulator. Proposed model behaviour is analysed using PSIM and MATLAB and validated with experimental results.