A Temperature Dependent, Single Particle, Lithium Ion Cell Model Including Electrolyte Diffusion

Abstract

Loworder, explicit models of lithium ion cells are critical for realtime battery management system (BMS) applications. This paper presents a seventhorder, electrolyte enhanced single particle model (ESPM) with electrolyte diffusion and temperature dependent parameters (ESPMT). The impedance transfer function coefficients are explicit in terms of the model parameters, simplifying the implementation of temperature dependence. The ESPMT model is compared with a commercially available finite volume based model and results show accurate matching of pulse responses over a wide range of temperature (T) and Crates (I). The voltage response to 30 s pulse charge–discharge current inputs is within 5% of the commercial code for 25 آ°C<T<50 آ°C at I≤12.5C and 10 آ°C<T<50آ°C at I≤1C for a graphite/nickel cobalt manganese (NCM) lithium ion cell.