Bahnzugkraftregelung in der Batteriezellfertigung*/Web tension control in battery cell production

Abstract

Viele Maschinen- und Materialparameter sind für die Qualität eines Elektroden-Einzelblattes verantwortlich. Relevant für Vereinzelung und Stapelbildung ist etwa die Bahnzugkraft, mit der die Elektrodenbahn während des Stanzvorgangs beaufschlagt wird. Diese wurde in der Versuchsanlage des wbk Institut für Produktionstechnik regelbar ausgeführt, um Zusammenhänge bei der Einzelblattstapelbildung zu untersuchen. Dieser Artikel stellt Auswahl und Funktion sowie die Integration der Lösung in die Versuchsanlage und die Auswirkung verschiedener Bahnzugkräfte auf die Maßhaltigkeit der gestanzten Einzelblätter vor.   The quality of an electrode single-sheet is affected by a multitude of machine and material parameters, such as the web tension force for separating and stacking applied to the electrode web during die cutting. As an adjustable force it was analyzed in a demonstrator at the wbk Institute of Production Science to identify interdependencies during single-sheet-stacking. This article presents the selection, function and integration of the solution into a demonstrator and how different web tension forces affect the dimensional accuracy of die-cut sheets.

Influence of Electrode Corrugation after Calendering on the Geometry of Single Electrode Sheets in Battery Cell Production

“…A quantification of the individual influences is not carried out in this article. A first approach to investigate length and width deviations of SES is given by Weinmann et al [9] The dependence of the length and width dimensions on the applied web tension is investigated on a cut-and-place system developed by Baumeister and Fleischer and Baumeister. [10,11] So far, the most comprehensive investigation of the SES influence on stacking accuracy has been carried out by Weinmann.…”

Model‐Based Optimization of Web Tension Control for the Flexible Cell Stack Assembly of Lithium‐Ion Battery Cells

“…Understanding the interaction of web guiding applications on the material behavior of electrode and separator webs is essential for efficient production, since there is a direct correlation between the web tension and the dimensional accuracy of separated electrode sheets in the production of stacked pouch cells. [ 11,12 ] The applied web tension also has a major influence on separator damage. [ 13 ] Furthermore, the Z‐folding‐stack assembly process includes a complex kinematic motion profile of the individual machine components.…”