Numerical Analysis of Discharge Characteristics in Lithium Ion Batteries Using Multiphase Fluids Model

概要

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A simple mathematical model for discharge characteristics in lithium ion batteries is developed based on a novel multiphase fluids model. The species of lithium, lithium ion, anion, and the electron are considered in the present model for transport phenomena. Maxwell's equations for an electric field and the Butler–Volmer equation for electrochemical reaction are also included. The numerical code based on the finite differential technique and the implicit successive overrelaxation (SOR) scheme is developed here and numerical solutions of discharge phenomena are obtained successfully for a wide range of operating conditions. Furthermore, comparisons of discharge characteristics between experimental and numerical results are performed in detail. They are in good agreement from the viewpoint of engineering applications. Consequently, it is concluded that numerical scheme proposed here is sufficiently practical for computer-aided design of lithium ion rechargeable batteries.
2005-06-15