Dr. Xiaoyu Li Profile

Dr. Xiaoyu Li

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Proceedings Article | 27 January 2023 Paper

Dual-surface li-ion battery deformation measurement by temporal electronic speckle pattern interferometry

Kunhan Yang, Zhipeng Sheng, Bing Chen, Xiaoyu Li, Yu Fu

Proceedings Volume 12550, 125501S (2023) https://doi.org/10.1117/12.2667169

KEYWORDS: Batteries, Deformation, Gaussian filters, Fourier transforms, Phase unwrapping, Safety, Phase shifts

Read Abstract +

he safety, performance, and lifetime of lithium-ion cells are critical for the acceptance of electric vehicles (EVs), but non-destructively evaluating cell quality issues is not easy. In recent studies, batterie's deformation measurement by optical methods is a promising candidate for detecting a possible local failure originating from mechanical and current inhomogeneities or potential gradients. However, the existing measurement techniques, such as laser scanning and digital image correlation, cannot achieve high-precision deformation measurement up to submicron. In this study, a temporal electronic speckle pattern interferometry (ESPI) is proposed to acquire out-of-plane deformation of both surfaces of a commercial Li-ion polymer battery simultaneously. Various data processing techniques, such as the Fourier and windowed Fourier transform (WFT) methods, are applied in temporal and spatial domains to extract the out-of- displacement during the battery charging process. High-precision deformation of both surfaces can be obtained during the charging process. The result shows that temporal ESPI can be a helpful tool to offer high-precision data for optimizing the Li-ion batteries model.

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