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Figure 14. Assembled flow frame with bipolar plate and side view of repeat unit in flow battery stack. As described in previous reports, the ability to operate the stack at higher flow rates enables higher current densities to be used which in turn can reduce system costs. This process is clearly shown in the costs analysis chart in Figure 12 (Q3 Project Status Summary). However, increasing the flow rate without increasing the back pressure is necessary to reduce the pumping power; this has been realized using an interdigitated flow design. Shown in Figure 15 is the pressure drop as a function of flow rate for the flow through design and the interdigitated flow design. The flow rate for the interdigitated design can be double and still maintain a back pressure approximately one half of the flow through design. This ensures the flow rate can be doubled without losing unnecessary losses associated with the back pressure in the flow circuit. Figure 15. Pressure drop versus flow rate for the flow through and interdigitated flow designs. During the fourth quarter of FY16, the 3-cell stack was operated at 160, 240, 320 and 400 mA/cm2. The coulombic, voltage, and energy efficiency for the stack at the four current densities is shown in Figure 16. The coulombic efficiency was relatively constant at all the current densities studied, ~95-96%. The voltage efficiency and corresponding stack energy efficiency, however, was dependent on the current density. The higher current density resulted in greater losses (IR, overpotentials, etc.) which decrease the voltage efficiency. It should be 18PDF Image | High Current Density Redox Flow Batteries
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Salgenx Redox Flow Battery Technology: Salt water flow battery technology with low cost and great energy density that can be used for power storage and thermal storage. Let us de-risk your production using our license. Our aqueous flow battery is less cost than Tesla Megapack and available faster. Redox flow battery. No membrane needed like with Vanadium, or Bromine. Salgenx flow battery
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