I want to know how the voltages of a battery block is mapped to soc values. At 35 % Soc i see voltage of the cell is 3.988 and at 60 % Soc the voltage is 3.992. What changes in Cell parameters would give me appropriate results ?
this is very dependent on which battery model that you are using. Any good battery model will be very non-linear, and be dependent on multiple parameters. The best way to understand a particular battery model is to consult its help documentation.