An improved SOC algorithm for Lithium-ion batteries in electric vehicles

This paper puts forward an improved ampere-hour integral method to estimate SOC for Lithium-ion Battery Pack in Electric Vehicle. According to the low estimation accuracy of traditional ampere-hour integral method, based on a large number of experiments, this paper analysed the parameters which affect the estimation accuracy of integral method, then used the least square method to establish the mathematical model and realized the correction factor of the parameters. The experiments show that this method can improve the accuracy of the battery SOC, and meet the application requirements for the safe operation of the electric vehicle.