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Section 2.5 Shunt currents 10 cells 20 cells 30 cells 40 cells a) Internal cell currents, charging with 150 A, tank SoC 50% b) Internal cell currents, discharging with -150 A, tank SoC 50% c) Internal cell currents, no load, tank SoC 50% 150 149 148 147 -150 -151 -152 -153 0 -1 -2 -3 Figure 2-10: Individual cell currents for a stack with 10, 20, 30 and 40 cells of design 2.1 During the charging process, shunt currents lower the internal cell currents, as shown in Figure 2-10 a). Hence, fewer electrons are available in the cells to convert vanadium ions and thus to charge the electrolyte. During the discharging process, shunt currents increase the magnitude of the internal cell current, as shown in Figure 2-10 b). Thus, more ‘charged’ vanadium ions are required to deliver the desired externally available discharging current. Consequently, the electrolyte is discharged faster than without shunt currents. As stated before, shunt currents also occur if the battery is neither charged nor discharged, as shown in Figure 2-10 c). If one compares the internal currents of a given cell, e.g. the 20th cell of the 40-cell stack of all three cases (charging, discharging and now load), shown in Figure 2-10 a) to c), we can confirm the dependence of the shunt currents on the externally applied battery current. For a higher charging current, the shunt current magnitude increases, for a larger absolute value of the discharging current, it decreases. This is caused by the increased cell voltage during the charging and the decreased cell voltage during the discharging of the battery. 1 5 10 15 20 25 30 35 40 Cell index 33 Current in A Current in A Current in APDF Image | Model-based Design Vanadium Redox Flow Batteries
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