Thermal modeling of the lithium/polymer battery. II: Temperature profiles in a cell stack

In Part 1 of this paper a one-dimensional model was presented that predicted the heat-generation rate, cell potential and temperature of a cell as a function of time and state of charge for galvanostatic discharge. A position-dependent per-cell heat-transfer coefficient was introduced to predict the temperature variation within cell stacks. In Part 2 the authors present a one-dimensional model for predicting the temperature profile in a cell stack using heat-generation rates calculated by isothermal discharge of the one-cell model given in Part 1. The accuracy of using heat-generation rates from isothermal discharges to estimate heat-generation rates during nonisothermal discharge is assessed. Calculations for heat-transfer to the surroundings and temperature profiles for cell stacks calculated by the cell-stack model are presented and compared to results of the one-cell model presented in Part 1. Simulation results for the Li{vert_bar}PEO{sub 15}-LiCF{sub 3}SO{sub 3}{vert_bar}TiS{sub 2} system are presented for discharge at the 3 h rate applicable to electric vehicle applications.