Twist Reliability Assessment of Flexible Batteries in Wearable Applications

摘要

Flexible power sources in FHE applications may be subjected to loads of flexing, twisting, folding and stretching. Lithium-ion batteries less than 1-mm in thickness are capable of powering thin flexible wearable electronics. While the reliability and performance of thick block lithiumion batteries has been studied in great detail – relatively little is known about thin flexible power sources under stresses of daily-motion. In this study, degradation of thin-flexible power source reliability has been studied under twist stresses of magnitude to replicate stresses of daily motion of human body using motion-control setups in a lab-environment. The samples are subjected to 150 charging-discharging cycles and the 60 twist-motion per every discharge cycle. The twist motion and the charging-discharging of the battery have been controlled via micro-controller and the LabView, respectively. Additionally, FEM model have been developed to predict the life of the battery and analyze acceleration factors between test conditions and use conditions.