Battery Internal Temperature Estimation Method through Double Extended Kalman Filtering Algorithm

doi:10.3901/JME.2020.14.146

Abstract

Abstract: Accurate battery internal temperature is very important to improve the safety and reliability of battery applications. However, due to many factors such as sensors and testing methods, its internal temperature is difficult to measure online. After integrating the Bernardi battery heat generation model and heat transfer model, the internal and external temperature of the battery is expressed using the equation of state analysis to obtain a discrete-time system of temperature; the double extended Kalman filter is used to establish the real-time temperature and environmental parameters of the battery. The estimation model realizes online estimation of the internal temperature of the battery. Results of the battery through the built-in temperature sensor show that the method can estimate the internal temperature of online with an error of <1 ℃ and high accuracy.

Key words: electric vehicle, battery, internal temperature estimation, double extended Kalman filter

CLC Number:

TP912

XIONG Rui, LI Xinggang. Battery Internal Temperature Estimation Method through Double Extended Kalman Filtering Algorithm[J]. Journal of Mechanical Engineering, 2020, 56(14): 146-151.

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