A Novel Approach for Open-Circuit Voltage and Entropic Heat Coefficient Characterization

We propose a novel approach to evaluate the open-circuit potential and the entropic heat coefficient (EHC) versus the state of charge (SoC) curve via charge/discharge tests run at different temperatures. In particular, we drive the battery cell with an extremely small current, thus moving along with different SoCs in a quasi-static condition. We present a model to properly define the measurand, and we discuss the assumption made to the method application. Finally, we analyze the method accuracy and its reliability through a comparison with other techniques commonly employed in the literature to this purpose.