Flexible Batteries Under Dynamic Folding and Flex-to-Install with Varying C-Rates and Temperatures

摘要

Flexible electronics may be subjected to static and dynamic folding during operation in wearable applications that require attachment of applique skin-patch or integration of electronics into wearable garments. Operation in wearable applications require power sources capable of sustaining static and dynamic stresses of daily motion without significant degradation in the battery capacity while subjected to various depths of charge for several charge-discharge cycles. The power sources can be folded either longitudinally or transversally in the case of dynamic folding. In this research study, the combined effects of deep and shallow depths of charge, distinct static and dynamic folding load(s), varying fold orientations and varying C- rates have been characterized for Li-Ion batteries. Thin flexible battery cells were cycled through multiple charge-discharge cycles under simultaneous static or dynamic folding loads. Output parameters such as battery capacity and its degradation have been analyzed for battery state assessment.