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chlorine injection is terminated. When charging under vacuum, the gas pump is operated and controlled to establish the desired reduced pressure in the stack compartment prior to initiating the charge. During charge the desired conditions of current density, stack pressure, electro lyte temperature, flow rate, etc., are maintained and the dependent parameters of Sp. Gr., pH, chlorine concentration, amp-mins, watt-hrs, etc., are routinely recorded. At the end of charge, the meters are reset and the discharge conditions established. The discharge is performed in a similar manner while a controlled rate of cylinder chlorine is injected into the electrolyte on the high-pressure side of the electro lyte pump. Full-power and usable coulombic and energy outputs are recorded and the efficiencies calculated. After the usable outputs are obtained, the remaining zinc is stripped from the stack to obtain bare substrates throughout before initia ting the next cycle. During most of the cycles performed in Phase X, the electrolyte volume was 36—40 liters and the initial electrolyte pH was set at ^0.1 to simulate the conditions in the 45kWh battery module. Similarly the initial Zn++ concentration was set between 2.9 and 3.0 molar. The test stand has an electrolyte volume capacity of m50 liters to permit evaluation of lower initial Zn++ concentrations and reduced concentration swings. RESULTS For this program, submodules were selected from the inventory of assemblies to be employed in the two 45/50kWh integrated battery modules being readied for test at EDA. The selected submodules were installed, one at a time, in the test stand case and run through several cycles each. For convenience the submodules have been assigned the numbers #1, #2, #3, and #3M (modified) indicating the sequence in which they were used. Also for convenient reference, all test runs were identified by consecutive cycle numbers throughout the program. 24-8PDF Image | Development of the Zinc-Chlorine Battery for Utility
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