Decoding the Electrode Swelling for Advanced Battery Diagnostics and Management

Abstract: A key barrier to EV adoption is the higher up-front cost of EVs compared to ICEVs. The total cost of ownership depends on the lower operating cost due to fuel and maintenance savings that depend on the route, utilization, and charging of the vehicle. If the battery stays healthy, vehicle to building, vehicle to grid, and other 2nd life applications can provide additional value streams and considered as an optimization problem. The battery state of health (SOH) is thus at the crux of the payback calculations and consequently can tip the EV adoption. Unfortunately, estimating the battery health with high confidence can only be done under certain discharge patterns. In this presentation, I will show you how cell expansion has an “aging signature” like a wrinkle at relevant discharge ranges and rates. Data collected from aged cells will further address the critical real-world considerations in estimating also gas venting and assess the intensity of battery fires for first-responders and post-accident management of damaged batteries.

Bio: Prof. Anna Stefanopoulou, is the William Clay Ford Professor of Technology at the University of Michigan. Stefanopoulou joined the Department of Mechanical Engineering in 2000 after working in the automotive industry. She is in the fellow rank of three of the largest engineering societies (IEEE, SAE, ASME). Her innovation in powertrain control technology has been recognized by multiple awards and has been documented in a book, 21 US patents, 340 publications (8 of which have received awards) on estimation and control of internal combustion engines and electrochemical processes such as fuel cells and batteries. Stefanopoulou also has co-authored influential reports on the cost effectiveness of fuel-efficient technologies for light-duty vehicles, sponsored by the National Academies, to help inform policymakers.