Thermal Modeling of the Lithium/Polymer Battery .2. Temperature Profiles in A Cell Stack

Abstract

In Part I 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 II we present a one-dimensional model for predicting the temperature profile in a cell stack using heat-generation rates calculated by isothermal discharges of the one-cell model given in Part I. 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 I. Simulation results for the Li\PEO(15)-LiCF3SO3\TiS2 system are presented for discharge at the 3 h rate applicable to electric vehicle applications