I am trying to model the equivalent circuit of a battery cell in simulink. I modelled one RC and Two RC circuit and tried to validate the discharge plot of the cell from a literature. Everything was done as per the literature but there is a difference observing at the end of simulation in the discharge plot as shown below. Can anyone suggest any opinion in improving the result or any particular thing i need to consider mainly.
This is the plot from literature
This is the plot from simulation
Literature: Comparative Research on RC Equivalent Circuit Models for Lithium-Ion Batteries of Electric Vehicles Lijun Zhang 1,* ID , Hui Peng 1 , Zhansheng Ning 1 , Zhongqiang Mu 1 and Changyan Sun