This paper presents extensive three-dimensional (3D) simulations of large LiFPO4 pouch cells. 3D simulations of the Li-ion battery behavior are highly nonlinear and computationally demanding. Coupling electrochemical modeling to thermal models represents an important step towards accurate simulation of the Li-ion battery. Non-uniform temperature, potential and current density through the battery induce non-uniform use of the active material and can have a negative impact on cell performance and lifetime. Different pouch cell designs, with different tab locations, have been investigated in term of performance, current density, potential and heat distributions. The model is first validated with experimental data at different current discharge rates. Afterwards, the electrochemical, thermal and electrical behaviors over each cell design under high discharge rate (4 It) are compared between configurations. It has been shown that the designs with symmetrical configurations show uniform potential and current density gradient, which minimize the ohmic heat and lead to more uniform active material utilization and temperature distributions across the cell surface.
Original languageEnglish
Pages (from-to)319-329
Number of pages10
JournalElectrochimica Acta
Volume147
Early online date30 Sep 2014
DOIs
Publication statusPublished - 20 Nov 2014

    Research areas

  • Li-ion battery, tab design, 3D electrochemical-thermal modeling, finite element method (FEM), distributions

ID: 2457574