Yazar "Dietrich, Franz" seçeneğine göre listele

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    Flow modeling for vacuum pressure-based handling of porous electrodes of lithium-ion batteries
    (Springer International Publishing, 2023) Schimanek, Robert; Aydemir, Muhammed; Müller, Alexander; Dietrich, Franz
    In lithium-ion battery (LIB) production, limp electrodes are handled gently by vacuumpressure based handling and transport systems, which generate a fluid flow that propagates through the porous electrode coating during handling. To investigate the limits and material-damaging behavior of vacuum pressure-based handling, it is required to understand how process parameters and electrode qualities affect fluid flow. Questions on how fluid flow reduces electrode quality are insufficiently addressed or modeled. Modeling the electrode and handling system interaction requires knowledge of the effective surface geometry and the volumetric flow rate caused by the pressure difference. In this article, flow through porous electrode coatings during handling is modeled. Experiments demonstrate a flow behavior according to the generalized Darcy's law. Thus, using Darcy's law, modeling fluid flow through the electrode improves the exploration of the limits and design of vacuum pressure-based handling and transport of electrodes in LIB production. © The Author(s) 2023.
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    Recollection center location for end-of-life electric vehicle batteries using fleet size forecast: scenario analysis for Germany
    (Elsevier, 2021) Yükseltürk, Ahmet; Wewer, Aleksandra; Bilge, Pınar; Dietrich, Franz
    The number of electric vehicle batteries is expected to increase. Their integration into circular economy requires their recollection at end-of-life. Decision makers need tools to determine suitable locations of recollection centers, as the decision is not trivial. Lithium batteries are hazardous materials, which require a minimization of transport duration. Here, we develop a mathematical model for locating a number of battery recollection centers. We discuss the results on the case of Germany for the time period from 2020 to 2050. The aim is to identify the influence factors on the location choice and therefore enable a founded decision.
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    Simulation based approach for high-throughput stacking processes in battery production
    (MDPI-Multidisciplinary Digital Publishing Institute, 2021) Mueller, Alexander; Aydemir, Muhammed; von Boeselager, Christina; van Ohlen, Nils; Rahlfs, Sina; Leithoff, Ruben; Droeder, Klaus; Dietrich, Franz
    What are the benefits of simulation-driven design and optimization of stacking processes in battery cell production? This question is addressed within the scope of the paper. This work proposes a method to reduce the effort for model-based design and optimization. Based on three case studies which originate from the development of high-speed stacking processes, this paper illustrates how the relevant loads on the intermediate products are determined with the help of the method. Subsequently, it is shown how the specific material models for battery electrodes and separators are identified, created and validated, as well as how process models are created and process limits are identified and optimized. It was possible to prove how process simulations can be used to minimize the effort required to validate developments and to efficiently determine optimized process parameters for a format and material change in a model-based manner. Consequently, more and more model-based processes should be taken into account during development and start-up in the future.