A Novel State-of-charge Correction and Online Capacity Estimation for Lithium-ion Batteries in Full Life Cycle

Abstract

In this paper, a novel online state-of-charge (SOC) correction approach in terms of utilizing only the Ampere-hour (Ah) counting is proposed. The method include updating the battery maximum capacity and a SOC modification and is verified on both fresh and degradation batteries. The algorithm presents reasonable results and is able to modify the SOC to an accuracy within ±3% for full life cycle, which has potential for real application in regular maintenance of hybrid electric vehicles.