<p>The emergence of a variety of flexible portable electronics applications has led to increased attention to flexible power sources. Examples include roll up displays, active radio-frequency identification (RFID) tags, wearable sensors, implantable medical devices. 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. &nbsp;Flexible hybrid electronics in wearable applications requires 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. &nbsp;In this research study, the combined effects of deep and shallow depths of charge, static-folding, dynamic-folding and twisting load(s), under varying fold orientations and varying C-rates have been characterized for thin-flexible Li-Ion batteries. &nbsp;Output parameters such as battery capacity and its degradation have been analyzed for battery state assessment. The use of lamination for thin-flexible battery integration has also been studied.&nbsp; Effect of lamination process conditions on the peel strength has been quantified.&nbsp; Laminated batteries have been subjected to static and dynamic fold tests as well so as to investigate the combined effect on capacity degradation. Finally, a life-prediction model has been developed for used in estimation of the battery capacity deterioration as a function of number of cycles, operating temperature, and depth-of-discharge. The model can be used to compute acceleration factors between accelerated test conditions and use-conditions.</p>

Life-Assessment for Thin Flexible Batteries Under U-Flex-to-Install and Dynamic Folding

Paper Proceedings: https://asmedigitalcollection.asme.org/InterPACK/InterPACK2021/volume/85505

ASME 2021 International Electronic Packaging Technical Conference and Exhibition (InterPACK2021)

Supporting the need among researchers worldwide for additional online and multimedia content, ASME now offers the ASME Conference Video Collection. This platform will collect and provide long-term access to conference presentation videos, encompassing all technology areas within ASME's technical conference and events program. About 30,000-40,000 engineers across all mechanical engineering and related disciplines participate in ASME conferences each year. This includes authors of approximately 6,000 to 8,000 technical papers published by ASME, the majority of whom also submit video presentations for our virtual conferences. The video collection will be available as an add-on to existing product packages or as a separate subscription.