Role of the temperature and aging in mechanical modeling of the active coating in Li-ion battery

Safety of lithium-ion batteries under mechanical loading poses a significant and urgent challenge in the Electric Vehicle (EV) industry. To assess the safety tolerance of the entire battery system, it is crucial to model the batteries subjected to mechanical abuse. The mechanical behavior of batteries is affected by temperature and aging, leading to substantial changes in the properties of active layers. Ignoring these factors may lead to an incomplete estimation of the batteries’ mechanical response. This study examines the results of component tests conducted on batteries at various temperatures and states of health (SOH). The analysis reveals that the particle and adhesion aspects contribute independently to the temperature effect and the aging effect. By incorporating the mechanical interpretation of parameters in the Drucker-Prager Cap (DPC) model, a methodology for characterizing the mechanical properties of in-situ active coatings under different aging conditions and temperatures is introduced. Additionally, the formulation of temperature effects on batteries at different SOH levels is presented. The comparison between finite element (FE) simulations and component tests further confirms the validity of the engineering relationship.