Thermal-Electrochemical Coupled Simulations for Cell-to-Cell Imbalances in Lithium-Iron-Phosphate Based Battery Packs
Date Issued
2016
Date
2016
Author(s)
Huang, Hsuan-Han
Abstract
Lithium-iron-phosphate (LFP) battery is one of the ideal energy storage devices owing to its outstanding characteristics such as high power output, no memory effect, and only a small degree of self-discharge over time. Thermal-electrochemical coupled analysis considering mass balance, charge balance, reaction kinetics, and energy balance is further adopted to evaluate discharge behaviors of the cell. Current distribution and joule heat generation of copper alloy sheets connecting several cells are also considered in the simulation. Values of material parameters employed in the thermal-electrochemical model are acquired from experimental measurements and previous studies. A running management built in MATLAB, 2010 is applied to deliver the coupling parameters of the thermal-electrochemical model such as operating current, heat generation and temperature of the battery cells connected in various configurations among different modulus of COMSOL Multiphysics, 2014. Calculation results of the voltage and temperature distributions of the individual cell are validated by the corresponding experiments. The developed model is further applied to study the effect of non-uniform temperature distribution and pack electrical imbalance among cells within the 4S6P LFP battery pack. Simulation results can facilitate the understanding of the electrical imbalance and assist the thermal management of the LFP battery pack.
Subjects
lithium-iron-phosphate based battery
thermal-electrochemical model
thermal management
finite element analysis
Type
thesis
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