A STUDY ON THE METHODS OF ESTIMATING THE STATE OF CHARGE (SOC) OF BATTERY

Batteries are a popular and important item that utilized as energy sources in variety of applications. The rise electric vehicles the twenty-first century has increased its importance. A battery's state charge (SoC) is critical information. It vital to estimate SoC with reasonable degree precision. During discharge cycles, lithium-ion batteries change their internal state. level battery changes throughout charging cycle dependent on structure components, which can degrade over time. Battery management systems depend counting cell voltage monitoring frequently status charge. It's difficult tell what components physically. This work will focus different methods estimating SoC. Basically, this study cover terminal Voltage method, Open Circuit Method, Coulomb Counting Method dynamic method based Unscented Kalman Filter (EKF). be simulation MATLAB it also practical experiment by discharging multiple comparative advantages drawbacks existing discussed work.