An intelligent solution for high-precision management of lithium-ion battery pack in electric vehicles based on the three-layer architecture of perception layer,network layer and application layer is proposed.The scheme adopts BMS intelligent Internet of Things system and Thevenin battery intelligent management model to realize real-time sampling and voltage balance control of single battery pack voltage and current.At the same time,the charging and discharging current of battery pack is measured through ESAM battery module and handheld terminal PSAM module to realize the collection and processing of BMS battery information,the transmission and summary of CAN battery information,and the identification and monitoring of EVT battery information.By building a MATLAB/Simulink simulation experiment platform,simulating the operating conditions of 24 series of lithium iron phosphate battery packs,the error of the estimated battery state of charge is within ± 5%,which confirms the reliability of the intelligent solution for battery management of electric vehicles based on the Internet of Things and the accuracy of the battery model and estimation algorithm.