Technical Paper
Stress Generation in Large Pouch Cells under Cycling and Abuse Conditions
2024-04-09
2024-01-2196
Pouch cells are increasingly popular form factors for the construction of energy storage systems in electric vehicles of all classes. Knowledge of the stress generated by these higher capacity pouch cells is critical to the proper design of battery modules and packs for both normal and abnormal operation. Existing literature predominantly offers data on smaller pouch cells with capacities of less than 10 Ah, leaving a gap in our understanding of the behavior of these larger cells. This study aims to bridge this knowledge gap by measuring loads and stresses in constrained 65 Ah pouch cells under both cycling and abuse conditions. To capture the desired responses, a load cell was located within a robust fixture to measure cell stress in real time after the application of a preloading force of approximately 323 Newtons. The thermal distribution across the cells was monitored by thermocouple measurements at multiple locations.