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Study of redox flow battery systems for residential applications (a) VisBlue 8 (b) Figure 4.1 – Frontside (a) and backside (b) of VisBlue 6 system. The VisBlue 8 battery (Figure 4.2) is a 5 kW/2.2 kWh VRFB with a stack with 36 electrochemical cells, supplied by Golden Energy Century Ltd., each one with a perfluoritaned IEM (cationic) with a thickness of 75 μm and two graphite felt electrodes with an active area of 1000 cm2. Graphite bipolar plates are used to connect electrically in series the 36 cells. The setup used to operate this stack is the same as described for VisBlue 6, however the electrolyte volume on each tank is 40 L and the charging step is operated with a constant current of 80 A (80 mA.cm- 2) until 58 V followed by a constant potential (58 V) until a cut-off current of 55 A. For the discharging step, a constant current of 80 A is also used but instead until a potential of 41 V. Then a constant potential (41 V) is used until a cut off current of 55 A is reached. The charge- discharge plots and a brief summary of the technical description can be found in Appendix C.2, Figure C.3 and Table C.2, respectively. Figure 4.2 – VisBlue 8 system. Chapter 4: Methods and materials 21PDF Image | Tubular Vanadium Air Redox‐flow battery
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