Scanning acoustic microscopy as a non-destructive imaging tool to localize defects inside battery cells

IF 5.4 Q2 CHEMISTRY, PHYSICAL Journal of Power Sources Advances Pub Date : 2020-12-01 DOI:10.1016/j.powera.2020.100035

L. Pitta Bauermann, L.V. Mesquita, C. Bischoff, M. Drews, O. Fitz, A. Heuer, D. Biro

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引用次数: 30

Abstract

Scanning Acoustic Microscopy (SAM) is shown here for the first time to be suitable for the visualization of defects like electrolyte leakage, faulty electrodes and gas accumulation inside coin and pouch battery cells. These failures are detected through the local atypical reflection of acoustic waves at faulty interfaces. Individual images are produced from the reflected wavefronts obtained at specific time delays allowing additionally information about the depth of the investigated failures. This fast and non-destructive visualization tool can be used for the quality control of battery cells during their production, contributing to a fast and economic screening of new materials or new production steps. SAM also brings a valuable contribution on the assistance in choosing representative spots of the battery for post-mortem analyses. SAM is in its infancy regarding the characterization of batteries. Fields for further development are suggested and discussed here.

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扫描声学显微镜作为一种非破坏性成像工具，用于定位电池内部缺陷

扫描声学显微镜(SAM)首次在这里展示，它适用于观察硬币和袋状电池内部的电解质泄漏、电极故障和气体积聚等缺陷。这些故障是通过故障界面处声波的局部非典型反射来检测的。单独的图像是由在特定的时间延迟下获得的反射波前产生的，可以提供有关所研究故障深度的额外信息。这种快速、非破坏性的可视化工具可用于电池生产过程中的质量控制，有助于快速、经济地筛选新材料或新的生产步骤。SAM还在帮助选择电池的代表性点进行尸检分析方面做出了宝贵的贡献。SAM在电池表征方面还处于起步阶段。本文提出并讨论了进一步发展的领域。

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