Improvement of Open Circuit Voltage Estimation Method for Lithium Ion Battery

Abstract

To estimate the remaining capacity of the li-ion battery, the Open Circuit Voltage (OCV) estimation method was examined. The OCV was calculated with revision of the terminal voltage from current and internal resistance. We analyzed the influence of the temperature and the voltage response for the internal resistance calculation and constructed the high accuracy OCV estimation method. Also, carried out the single cell simulation test and inspected the estimation accuracy. It revealed that possible to estimate the OCV with error 0.002V.