Heat flux based method for determination of thermal parameters of the cylindrical Li-ion battery: Uncertainty analysis

A method for the determination of the thermal parameters of a cylindrical Li-ion battery by using heat flux measurements is analysed. The method for the determination of the thermal parameters, such as though-plane thermal conductivity and heat capacity, is based on the cylindrical cell battery model, which is explained in detail. The analysis of the applicability of the considered method and its modifications for the thermal parameters determination is based on an uncertainty analysis of the measured parameters. The analysis of the uncertainty showed the possibility to use heat flux measurements for the determination of the cylindrical cell heat capacity with 3.0 % of uncertainty. The uncertainty of the though-plane thermal conductivity determination was significantly higher, which requires an additional improvement of the considered method for the thermal parameters determination of the cylindrical Li-ion cell.