Research on SOC Algorithm of Lithium Ion Battery Based on New Energy Vehicle

In recent years, energy crisis and environmental pollution have increasingly become the focus of public attention. New energy vehicles have developed rapidly as a means to effectively alleviate the crisis. Power system is an indispensable energy storage system of new energy vehicles, which determines the performance of new energy vehicles to a certain extent. State of charge (SOC) of power battery is one of the key problems to be solved in the power system of new energy vehicles. Accurate SOC estimation can effectively judge the vehicle mileage, provide users with reasonable vehicle control opinions, and ensure the reliable operation of the battery management system. At the same time, for the power battery, accurate SOC estimation can effectively avoid the overcharge and discharge of the power battery pack and other operations that have permanent damage to the battery. Therefore, the SOC estimation of power battery, as a key link in the development of new energy vehicles, has very important research significance.