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a 5-hour charge and 5-hour discharge accounts for 7.3% coulombic loss over the cycle. However, this rate is less during discharge because the chlorine activity is decreased due to electrochemical consumption at the chlorine electrodes. Stack Modifications The results of the parasitic current measurements and the previous cell modifica tions were used to formulate a stack rebuild program. The bus-to-tray seals were redesigned in an effort to improve the intercell leakage and reduce the leakage parasitic current contribution. The electrolyte drain paths from the unit cells were redesigned to form cups and tubes to reduce the outlet parasitic current con tribution. Re-evaluation of the parasitic currents after the modifications were completed showed significant improvement in both the leakage and parasitic currents. A comparison of the data obtained before and after the modifications is shown in Figure 23-3. TOTAL PARASITIC AFTER LEAKAGE AFTER Figure 23-3. after cell modifications. TOTAL PARASITIC BEFORE LEAKAGE BEFORE S 7.5 10 12.5 APPLIED POTENTIAL—volts Comparison of currents prior to and 23-6PDF Image | Development of the Zinc-Chlorine Battery for Utility
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