Comparative study on the mechanical characteristics of solid-state batteries for electric vertical takeoff and landing aircrafts

Hits:

Impact Factor:10.7

DOI number:10.1016/j.est.2026.125341

Journal:Journal of Energy Storage

Key Words:Electric vertical takeoff and landing aircrafts; Solid-state batteries; Strain evolution path; Diffusion strain; Thermal strain

Abstract:Solid-state battery mechanical characteristics greatly affect its performance and safety. This study investigates the mechanical characteristics of a g18650 solid-state battery under varying operating conditions. Strain evolution paths of solid-state batteries are analyzed across different current rates, ambient temperatures, and states of health. Experimental results show that during the CCCV charging stage, the strain first increases and then decreases, and during the CC discharging stage, the strain progressively increases and reaches a peak. The typical strain peak value and the typical strain valley value are 38με and −10με respectively. The strain evolution paths differ markedly across current rates, ambient temperatures, SOH. Specifically, the strain peak has a positive correlation with the current rate, exhibits a non-monotonic dependence on the ambient temperature, and both the strain peak and the strain valley of the aged solid-state battery are generally smaller than those of the fresh solid-state battery. Furthermore, the proportion of the irreversible strain is not constant but is strongly and synergistically influenced by the ambient temperature, current rate, and SOH. The diffusion strain and the thermal strain are decoupled by constructing an equivalent strain model. The diffusion strain constitutes the major component of the total strain and is two orders of magnitude higher than the thermal strain. This study demonstrates the essential for the mechanical characteristic anomalies.

Note:中科院2区Top

Co-author:Hongjun Pan,Chao Gong

First Author:Muyao Wu

Indexed by:Journal paper

Correspondence Author:Li Wang

Document Code:125341

Discipline:Engineering

Document Type:J

Volume:183

ISSN No.:2352-152X

Translation or Not:no

Date of Publication:2026-10-27

Included Journals:SCI、EI

Links to published journals:https://www.sciencedirect.com/science/article/abs/pii/S2352152X2605005X