Lithium-ion Open Circuit Voltage (OCV) curve modelling and its ageing adjustment

By L. Lavigne, Jocelyn Sabatier, J. M. Francisco, F. Guillemard, A. Noury. 2016

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SoC Estimation for Lithium-ion Batteries: Review and Future Challenges (2017, methodology): “SoC estimation methods commonly impose a characterization of the OCV curve (mainly through a polynomial or a look-up table), as they use either a direct OCV curve inversion method (if the application permits cell steady state voltage measurement), or a cell model-based methods [42].”
An Overview and Comparison of Online Implementable SOC Estimation Methods for Lithium-Ion Battery (2018, background): “Furthermore, the relationship between OCV and SOC has proven to change with temperature and age [32]–[35].”
A Study on the Open Circuit Voltage and State of Charge Characterization of High Capacity Lithium-Ion Battery Under Different Temperature (2018, background): “[10] proposed through some hypotheses and an appropriate definition of the cell state of charge, and proposed a two stage lithium-ion OCV curve model to estimate battery SOC.”