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  4. Nondestructive Defect Detection in Battery Pouch Cells: A Comparative Study of Scanning Acoustic Microscopy and X-Ray Computed Tomography
 
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2023
Journal Article
Title

Nondestructive Defect Detection in Battery Pouch Cells: A Comparative Study of Scanning Acoustic Microscopy and X-Ray Computed Tomography

Abstract
Localizing defects inside battery cells before performance decreases or safety issues arise remains a challenge. This study compares two non-destructive testing methods for the detection and 3D visualization of defects at different depths inside a pouch battery cell: Scanning Acoustic Microscopy (SAM) and X-ray computed tomography (CT). SAM is used in reflection mode to detect defects at depths of up to four electrode sheets using a 15 MHz transducer. With CT, defects on all eight stacked electrode sheets inside the pouch cell can be located. The longer measurement duration is though a drawback. Both methods can complement each other in detecting defects in thin pouch cells as End-of-Line tests in production or for second-life applications. As an inline quality test of assembled cells, SAM shows promise as a cost-effective and efficient method for detecting defects. Ultimately, both methods have the potential to improve the non-destructive quality assurance of lithium-ion battery cells, contributing to the safety and performance of battery technology.
Author(s)
Pitta Bauermann, Luciana  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Münch, Johannes
Fraunhofer-Institut für Solare Energiesysteme ISE  
Kroll, Moritz  orcid-logo
Fraunhofer-Institut für Solare Energiesysteme ISE  
Enghardt, Stefan
Technische Universität Dresden
Vetter, Matthias  
Fraunhofer-Institut für Solare Energiesysteme ISE  
Journal
Energy technology  
Open Access
File(s)
Download (6.5 MB)
Rights
CC BY 4.0: Creative Commons Attribution
DOI
10.1002/ente.202300323
10.24406/publica-1801
Additional full text version
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Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • defect location

  • lithium-ion battery

  • non-destructive testing

  • pouch cell

  • scanning acoustic microscopy

  • x-ray tomography

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