Stress-Constrained Fast Charging of Lithium-Ion Battery Enabled by Multi-Scale Stress Modeling

Fast charging of lithium-ion battery (LIB) is a pivotal technology fostering the widespread adoption of electric vehicles. However, over-stress caused by high-rate charging can induce a rapid degradation of LIB or even trigger catastrophic safety incidents. Motivated by this, this paper proposes a novel multi-scale electrochemical-mechanical battery model, which can predict precisely the mechanical performance of LIB. Enabled by this model, a stress-constrained fast charging strategy is proposed, for the first time, to ensure the fast refueling while promising an expected life performance of LIB. Experimental results suggest that the proposed strategy can avoid effectively the loss of active material in anode induced by over-stress during the high-rate charging. In particularly, the proposed charging strategy shortens the charging process by 16.8% compared to the benchmarked constant-current charging without sacrificing the cycling stability.