Research on SOC estimation of residual power of lithium-ion batteries for electric vehicles based on extended Kalman filtering algorithm

• Autores: Haifeng Xiang
• Localización: Applied Mathematics and Nonlinear Sciences, ISSN-e 2444-8656, Vol. 8, Nº. 1, 2023, págs. 2849-2860
• Idioma: inglés
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• Resumen

  • As the energy carrier of electric vehicles, how to accurately estimate the remaining power (SOC) of the battery is one ofthe key technologies in the field of electric vehicle design. Effective estimation of SOC can bring accurate continuousmileage information to the driver, theoretically avoid overcharging and discharging the battery, and also protect thedriver's driving safety. In the research of SOC estimation method, constructing a suitable battery model is an importantmeans to improve SOC estimation and to improve the prediction accuracy. In order to obtain a higher response accuracyof the model, this paper proposes an electric vehicle SOC model based on the extended Kalman filter algorithm. Basedon the actual data of lithium-ion power battery, SOC estimation research is carried out. The research shows that: whenthe internal temperature of the battery is the same as the ambient temperature, and both are 25 °C, the model is accurate,the terminal voltage difference is small, and the average voltage difference is 9mV respectively; at room temperature, theextended Kalman filter algorithm has a significant effect on the recovery percentage of SOC voltage. The average is over73%, and the accuracy is high. The extended Kalman algorithm in this paper we use to estimate the SOC current waveform.The simulation results show that the SOC discharge current is 4A, which has high estimation accuracy and strongapplicability.