Simulation and Measurement of Local Potentials of Modified Commercial Cylindrical Cells

Multi-dimensional modeling is a powerful approach to get access to internal variables such as current density or temperature distribution. In this work, an effective coupling approach is developed to describe the behavior of a modified commercial LFP/graphite cell during discharge. The model is based on a geometrical decomposition of the cell's features followed by a re-assembly by means of a scaled volume averaging method (SVAM). Following this approach, mass and charge transport within the porous electrode and separator domain, charge transport within the current collector domain and heat transport within the cell domain can be described in detail whereby the effective coupling method allows for precise spatially resolved simulation results within minutes. Simulated cell voltage profiles and internal temperature agree well with measurements which are performed and discussed in Part I. By addressing local potentials and internal temperature the model is validated more precisely than by measuring surface temperature and terminal voltage only. Additionally, a study on current density distribution, internal temperature and local state of charge is performed. (C) 2015 The Electrochemical Society. All rights reserved.