How mechanical deformation affects battery impedance responses
We are pleased to share that researchers from TUG – Graz University of Technology have published a new open-access scientific examining how mechanical deformation influences the electrochemical behaviour of lithium-ion batteries , a topic of growing importance for battery safety and performance in both automotive and stationary applications. The article, titled “Effects of Mechanical Deformation […]
We are pleased to share that researchers from TUG – Graz University of Technology have published a new open-access scientific examining how mechanical deformation influences the electrochemical behaviour of lithium-ion batteries , a topic of growing importance for battery safety and performance in both automotive and stationary applications. The article, titled “Effects of Mechanical Deformation Depth and Size on the Electrochemical Impedance Response of Lithium-Ion Batteries”, is freely available online.
As interest in electrified transport and large-scale energy storage grows, understanding how batteries respond to mechanical stresses, such as impacts, compression, or structural deformation, is critical. Real-world battery systems encounter mechanical loads during vehicle use, vibration, installation, and packaging constraints, and these loads can alter internal cell behaviour in ways that affect both performance and safety.
In this study, the authors use electrochemical impedance spectroscopy (EIS) to analyse how different depths and sizes of mechanical deformation affect battery impedance responses. EIS is a widely used diagnostic technique in battery research that provides insights into internal resistance, charge transfer processes, and degradation mechanisms. By systematically varying mechanical deformation conditions and observing the resulting impedance spectra, the paper demonstrates that cell mechanical state can meaningfully influence impedance signatures, which has important implications for battery diagnostics, modelling, and real-time state assessment.
The findings highlight the need to consider mechanical effects alongside electrical and thermal factors in battery models and management systems. This is particularly relevant for applications where batteries are subject to repeated or unexpected mechanical stresses, for instance in automotive environments with road vibrations and crash scenarios, or in stationary systems where pack compression and thermal expansion occur over long lifetimes.
Understanding how mechanical deformation alters EIS responses also supports more robust implementations of diagnostic algorithms and state-of-health estimators that are used in battery management systems (BMS). By integrating such insights into advanced models, researchers and engineers can improve the reliability of battery condition monitoring and enhance safety margins in both design and operation.
The paper contributes to a broader effort across the research community to link physical deformation, internal electrochemistry, and observable electrical behaviour, making it a valuable reference for those working on battery modelling, diagnostics, and integrated BMS solutions.
Read the full article: https://zenodo.org/records/18594080
