Isolation of relaxation times under open-circuit conditions: Toward prognosis of nascent short circuits in Li-ion batteries.

ABSTRACT: Li-ion battery mishaps are primarily attributed to short circuits, which missed early detection. In this study, a method is introduced to address this issue by analyzing the voltage relaxation, after initiating a rest period. The voltage equilibration arising from solid-concentration profile relaxation is expressed by a double-exponential model, whose time constants, τ₁ & τ₂, capture the initial, rapid exponential contour and the long-term relaxation, respectively. By tracking τ₂, which is very sensitive to small leakage currents, it is possible to detect a short early on and estimate the short resistance. This method, validated with experiments on commercial batteries induced with short circuits of varying extents, has >90% prediction accuracy and enables

SUBMITTER: Bharathraj S 

PROVIDER: S-EPMC10182328 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature