This study carries out a multi-physics coupling model for a battery pack consisted of cells with different initial resistance and capacity. A pseudo 2D electro-chemical model coupled with a lumped thermal model is used to describe each cell inside the pack. Based on this cell model, a coupled thermal-electrochemical model for a battery pack is built, which is able to predict the current load distribution and uneven heat generation during the charge and discharge procedure.
Using the coupled electrochemical-thermal model, cell initial parameters’ impact on pack performance was studied, including resistance and capacity inconsistency. Different cell numbers and connection pattern (parallel/series) were also selected to explore the changing mechanisms in load non-uniformity and heat performance.