Electrothermal Behavior of Lithium-Ion Batteries with Different Levels of Power Fade

During the cycling of lithium-ion batteries, the internal resistance increases due to the deposition of Solid Electrolyte Interface (SEI), which causes the power fade of batteries. In this paper, lithium ion batteries with different levels of power fade are compared, their internal resistance is measured and used to predict their thermal behavior. Based on numerical methods, temperature rise and heat generation of lithium ion batteries are presented under constant C-rate discharge and power pulse. Furthermore, the calculated results are validated through measurement. Finally, it can be concluded that higher level of power fade leads to higher heat loss and lower output power and an optimal DOD range is advised for the purpose of reducing temperature rise.