A Single Particle-Based Battery Degradation Model Including Chemical and Mechanical Degradation Physics

Accurate and rapid prediction of the status of a lithium-ion battery is an important process in Battery Management System (BMS). In this work, a single particle model is developed by focusing on crack propagation coupled with Solid Electrolyte Interface (SEI) layer formation and its evolution. The lithium ion loss due to the SEI layer evolution is integrated with our previously developed advanced single particle model that includes electrolytic physics. This model is fairly well predictive of capacity fade and voltage change as a function of cycle number and temperature. Despite its implementation in a single particle model, the results provide quantitative information on the role of SEI layer growth and crack propagation, and corresponding capacity fade and power loss.