Verification Platform of <i>SOC</i> Estimation Algorithm for Lithium-Ion Batteries of Electric Vehicles

As one of the core technologies of electric vehicles (EVs), the state of charge (<i>SOC</i>) estimation algorithm of lithium-ion batteries is directly related to the performance of the battery management system (BMS). Before EVs are put into the market, the <i>SOC</i> estimation algorithm must be tested and verified to ensure the reliability of the BMS and the safe operation of EVs. Therefore, this paper establishes a lithium-ion batteries’ <i>SOC</i> estimation algorithm verification platform for the comprehensive performance evaluation and verification of the new <i>SOC</i> estimation algorithm. In addition, there are two schemes, including real-time <i>SOC</i> estimation verification and offline <i>SOC</i> estimation verification can be selected, which improve the reliability and efficiency of verification. Firstly, the design idea of the verification platform (the research and development purpose, functional requirements, and the overall design scheme) is introduced in detail. Secondly, the modular design idea is used to design the hardware structure of the verification platform, which mainly includes the BMS host module, BMS slave module, battery charger module, and electronic load module. Finally, the software system, including the communication architecture, the <i>SOC</i> reference standard and evaluation indexes of the algorithm, and the upper computer function and implementation is designed to realize the functions of the verification platform.