Batteries, Vol. 7, Web pages 64: High-Potential Test with regard to Quality Control of Separator Defects in Battery Cell Production
Batteries doi: 10. 3390/batteries7040064
Authors: Louisa Hoffmann Manuel Kasper Maik Kahn Georg Gramse Gabriela Ventura Silva Christoph Herrmann Jordan Kurrat Ferry Kienberger
Lithium-ion batteries are the key technology for electromobility; thus, quality control within cell production is really a central aspect for the success of electric vehicles. The particular detection of defects plus poor insulation behavior from the separator is essential with regard to high-quality batteries. Optical high quality control methods in cellular production are unable to detect little but still relevant problems in the separator level, e. g., pinholes or particle contaminations. This gap can be closed simply by executing high-potential testing to analyze the insulation efficiency of the electrically insulating separator layer in a sack cell. Here, we existing an experimental study in order to identify different separator flaws on dry cell stacks on the basis of electric voltage stress and mechanical pressure. Additionally , limited element modeling (FEM) is definitely used to generate actual physical insights into the partial discharge by examining the defect structures and the particular corresponding electric fields, which includes topographical electrode roughness, impurity particles, and voids within the separator. The check results show that tough discharges are associated with significant separator defects. Centered on the study, a voltage of 350 to 450 V and the pressure of 0. 3 or more to 0. 6 N/mm2 are identified as the best possible ranges for your test strategy, resulting in failure detection rates of up to 85%.