Abstract
In order to ensure the safety and long-term reliability of automotive batteries, it is essential to understand the response of lithium-ion batteries against large-scale deformation, such as nail penetration and crush tests, as well as steady charge-discharge cycling accompanying with heat generation and deformation. Therefore, it will be quite useful for battery safety and reliability design if those phenomena can be predicted by simulation. In this study, a battery model was constructed that can reproduce the charge-discharge characteristics of automotive lithium-ion batteries based on the deep and precise understandings of the compositions, and their thermophysical and mechanical properties, and the model was improved by contrasting with the experimental results of heat generation and deformation behavior during charge-discharge. The temperature inside the battery and the swelling phenomena during charging and discharging was estimated using the model constructed in this study.
