A Simulation of Lithium-Ion Battery Ohmic Resistance Identification

Abstract

In electric vehicle applications, it is necessary to estimate the internal resistance of Lithium-ion battery, which is feasible through internal resistance identification based on equivalent circuit model. But in the actual battery management system, current sampling tends to lag behind the voltage sampling, which affects the identification accuracy apparently. In this article, the ohmic resistance of the lithium-ion battery is evaluated based on equivalent circuit model and least squares identification algorithm. Influence by desynchronized sampling of current and voltage is simulated. And a reasonable value of sampling step is introduced.