The State-of-Energy: A New Criterion for the Energetic Performances Evaluation of Electrochemical Storage Devices

Abstract

One simple question always obsesses any designer of an energetic system using electrochemical storage: is the battery able to deliver or absorb the requested power during the requested duration? Even nowadays, the battery's available reserve is considered in terms of quantity of charge (or capacity) Thus, intermediate stages are necessary to get to its energetic and power reserves. The general approach to evaluate a battery's energetic reserve consists into two modeling. One model describes the remaining capacity while the second describes its voltage variations. This global approach makes the final modeling complex and moreover it brings up multiple sources of error. We propose a new approach that allows a direct determination of battery's power and energetic performances directly from a power solicitation profile. It is based on a new criterion: the SOE as for State-Of-Energy.