Abstract
Long charging time is one of major inconveniences in choosing electric vehicles (EVs). In order to solve it, shortening the charging time within fifteen minutes or less is set to satisfy EV customers. However, without deep understanding both electronic and ionic behaviors within the battery, to analyze and predict the physical and electrochemical behaviors must be limited. Furthermore, the unbalance between electron and ion flows becomes more harsh as the charging rate increases. Thus, building a virtual 3D structural and electrochemical model and simulating it must be a powerful tool to look into the inside the battery during fast charging. In this work, a new digital twin battery technology, combining 3D structural and electrochemical modeling tools, is introduced and some case studies are shown to suggest how to improve the fast charging characteristics as a point of material properties and cell designs as well. Especially, electronic and ionic current flows, surface overpotential, local state-of-charge, etc are estimated and compared systematically.
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