MATLAB: SOC estimation using UKF

Question

I am building a battery model to estimate SOC using UKF, my doubt is how to initialize Em, R and C values to enter in lookup tables also Capacity, Initial Charge Deficit and Cell dimensions for thermal properties. I know we need to initialize using m-script but the doubt is- I saw some example model on Mathworks but did not understand from where were those values taken. Was it some experimental data or specs from some datasheet ?

Kindly clarify.

Thanks in advance

Answer 1

I can understand that you are interested in knowing how we arrived at the values of Em, R and C stored in the lookup table. In the example, Nonlinear State Estimation of a Degrading Battery System R0, R1, C1 and Em are 2D look-up tables that are dependent on SOC and battery temperature. The parameters in the look-up tables are identified using experimental data which was obtained from the publication given below:

Huria, Tarun, et al. "High fidelity electrical model with thermal dependence for characterization and simulation of high power lithium battery cells." Electric Vehicle Conference (IEVC), 2012 IEEE International. IEEE, 2012.