Working temperature effects on mechanical integrity of cylindrical lithium-ion batteries

The purpose of this study is to explore the influences of working temperatures on mechanical properties and the short circuit of cylindrical lithium-ion cells. A series of compression and threepoint bending experiments of a typical 18,650 cylindrical lithium-ion battery is implemented during the discharging process in different working temperatures. The experimental results show that the working temperature presents a negative correlation with the onset of short-circuit in compression loading but non-significant effects on mechanical properties in three-point bending. For the discharging rate, there are non-significant effects on mechanical properties and short circuits of battery cells in both bending and compression loading experiments. In summary, the working temperature effects cannot be neglected in cylindric lithium-ion battery failure, and combined simulation and experimental results indicate that the short circuit criteria for a highly efficient FE battery cell modeling can be established based on internal stress in a specific direction.

Automated summary

The purpose of this study is to investigate the effects of working temperature on the mechanical properties and short circuit of cylindrical lithium-ion cells. The experimental results reveal a negative correlation between working temperature and the onset of short circuit in compression loading, but non-significant effects on mechanical properties in three-point bending. The discharging rate has no significant effects on the mechanical properties and short circuits of battery cells. In conclusion, the influence of working temperature should not be neglected in the failure of cylindrical lithium-ion batteries.