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Article

High-Potential Test for Quality Control of Separator Defects in Battery Cell Production

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Elenia Institute for High Voltage Technology and Power Systems, Technische Universität Braunschweig, Schleinitzstraße 23, 38106 Braunschweig, Germany
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Battery LabFactory Braunschweig, Technische Universität Braunschweig, Langer Kamp 19, 38106 Braunschweig, Germany
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Keysight Labs Linz, Keysight Technologies Austria GmbH, Gruberstrasse 40, 4020 Linz, Austria
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Institute of Machine Tools and Production Technology (IWF), Technische Universität Braunschweig, Langer Kamp 19b, 38106 Braunschweig, Germany
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Authors to whom correspondence should be addressed.
Academic Editor: Juan Carlos Álvarez Antón
Batteries 2021, 7(4), 64; https://doi.org/10.3390/batteries7040064
Received: 9 July 2021 / Revised: 1 August 2021 / Accepted: 17 September 2021 / Published: 24 September 2021
Lithium-ion batteries are a key technology for electromobility; thus, quality control in cell production is a central aspect for the success of electric vehicles. The detection of defects and poor insulation behavior of the separator is essential for high-quality batteries. Optical quality control methods in cell production are unable to detect small but still relevant defects in the separator layer, e.g., pinholes or particle contaminations. This gap can be closed by executing high-potential testing to analyze the insulation performance of the electrically insulating separator layer in a pouch cell. Here, we present an experimental study to identify different separator defects on dry cell stacks on the basis of electric voltage stress and mechanical pressure. In addition, finite element modeling (FEM) is used to generate physical insights into the partial discharge by examining the defect structures and the corresponding electric fields, including topographical electrode roughness, impurity particles, and voids in the separator. The test results show that hard discharges are associated with significant separator defects. Based on the study, a voltage of 350 to 450 V and a pressure of 0.3 to 0.6 N/mm2 are identified as optimum ranges for the test methodology, resulting in failure detection rates of up to 85%. View Full-Text
Keywords: lithium-ion batteries; battery production; inline analytics; quality control; high potential test; finite element modeling; defect detection rate; electrical field; separator lithium-ion batteries; battery production; inline analytics; quality control; high potential test; finite element modeling; defect detection rate; electrical field; separator
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MDPI and ACS Style

Hoffmann, L.; Kasper, M.; Kahn, M.; Gramse, G.; Ventura Silva, G.; Herrmann, C.; Kurrat, M.; Kienberger, F. High-Potential Test for Quality Control of Separator Defects in Battery Cell Production. Batteries 2021, 7, 64. https://doi.org/10.3390/batteries7040064

AMA Style

Hoffmann L, Kasper M, Kahn M, Gramse G, Ventura Silva G, Herrmann C, Kurrat M, Kienberger F. High-Potential Test for Quality Control of Separator Defects in Battery Cell Production. Batteries. 2021; 7(4):64. https://doi.org/10.3390/batteries7040064

Chicago/Turabian Style

Hoffmann, Louisa, Manuel Kasper, Maik Kahn, Georg Gramse, Gabriela Ventura Silva, Christoph Herrmann, Michael Kurrat, and Ferry Kienberger. 2021. "High-Potential Test for Quality Control of Separator Defects in Battery Cell Production" Batteries 7, no. 4: 64. https://doi.org/10.3390/batteries7040064

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