'Understanding' Thermal Runaway in Li-ion batteries

摘要

The kinetics of the electrode/electrolyte reactions in lithium-ion batteries at elevated temperature have been studied using accelerating-rate and differential scanning calorimetry. Mathematical expressions for the power evolved per gram of electrode as a function of temperature and reaction history have been developed. Using these "power functions", the heat equation and Newton's law of cooling, it is possible to accurately predict the response of a lithium-ion cell of any size and shape to the oven exposure test. A user-friendly Visual C++ program that implements this model will be demonstrated.