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Section 5.1 Current state of science Chapter 5 Model-based cell design Model-based cell design 5.1 Current state of science While optimization of single-cell designs is common, cell designs are scarcely studied in stack context. Many design studies deal with replacing the simple flow-through electrode by more sophisticated designs [68, 70, 80–84]. Newly proposed designs comprise interdigitated or serpentine structures that significantly improve the battery performance. However, the manufacturing process of large-scale cells incorporating these structures is still very challenging. Hence, in this work, only simple flow-through electrodes are considered. In [46], electrode height and compression are varied to identify a combination of a low area specific resistance (ASR) and an acceptable hydraulic resistance of the electrode. In this work, electrode height and compression is kept constant, to limit the number of studied design variations. In [85], computational fluid dynamic (CFD) simulations are applied to optimize the internal electrolyte distribution of a commercial cell design. Similar to this work, the study also uses a meander-shaped channel. However, the modeled structures for electrolyte distribution are much more complex, which is beyond the scope of this work. Electrode width Main current flow direction (Trough-plane) Graphite felt electrode Bipolar plate Membrane Current collector Figure 5-1: Simplified scheme of a redox flow cell Electrolyte flow direction (In-plane) 77 Electrode heightPDF Image | Model-based Design Vanadium Redox Flow Batteries
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