Lithium-Ion Battery Internal Resistance Model Based on the Porous Electrode Theory

A one-dimensional electrochemical DC pulse simplified model for an 8Ah lithium ion phosphate battery monomer is built with the help of COMSOL software on the base of the porous electrode theory. Based on the experimental data and analysis, the model can be optimized by putting the values of effective conductivity and the concentration of the lithium at different temperature as well as the equilibrium potentials of active materials into the model. This model can reflect the pulse property of the battery very well. Through the DC pulse model, we can analyze how the internal parameters influence the battery internal resistance, which provides a reference for improving the battery design.