ChBE Seminar Series: Venkat Subramanian, U. of WA
Thursday, March 2, 2017
11:00 a.m.-12:00 p.m.
2108, Chemical and Nuclear Engineering Building
Analyzing and Minimizing Capacity Fade of Lithium-ion Batteries through Model-based Optimal Control: Theory, Computation and Experimental Validation
In order to significantly expand the battery electric vehicle market, and to increase the use of lithium-ion batteries in electric grids, there is a need to develop optimal charging strategies to utilize the batteries more efficiently and enable longer life. Advanced battery management systems that can calculate and implement such strategies in real time are expected to play a critical role for this purpose. This talk investigates different approaches for determining model-based optimal charging profiles for batteries, and experimentally validates the gain obtained using such profiles. Optimal profiles that maximize the cycle life of the cells are implemented on 16 Ah cells. An improvement of more than 100% in cycle life is observed experimentally, for our test conditions on this cell design. This study is the first to experimentally demonstrate that the improved extra knowledge obtained by sophisticated physics-based models results in significant improvements in battery performance when employed in a real time control algorithm.