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Development of the Zinc-Chlorine Battery for Utility

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Development of the Zinc-Chlorine Battery for Utility ( development-zinc-chlorine-battery-utility )

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CHANNEL PLATE EXIT TO SUMP DRAIN CUP Figure 24-4. Illustration of electrolyte return flow path. Unit cell overflows into drain cup which leads to an extended channel that empties into the sump. an integral part of this test stand. Figure 24-5 is a diagram of the system and Figure 24-6 is a photograph of the complete stand installed in a vent hood. In addition to the sump and stack which are contained inside the rectangular case, the test stand incorporates a G-10 main electrolyte pump for circulating electrolyte, an in-line heat exchanger for controlling electrolyte temperature, an in-line filter which also serves to separate undissolved gas from the electrolyte fluid, and a G-10 gas pump for controlling stack pressure. During charge, evolved chlorine is vented to the hood. During discharge, cylinder chlorine is injected into the electrolyte stream on the high pressure side of the pump. Test Stand Capabilities The design of the test stand provides certain operational features and some special diagnostic capabilities. The stack can be operated under closely controlled reduced pressure down to -11 psig (0.25atm absolute). The reduced stack pressure is estabĀ­ lished using the G-10 gas pump and monitored by a mercury manometer. Under standard test conditions, the stack pressure during charge is maintained at -5 psig (0.66atm) to simulate the design conditions for the 45kWh peak-shaving battery. 24-5

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