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A differential manometer is connected to the battery gas space to prevent the possi bility of excessive pressurization of the battery box. The total gas volume is 18 liters. Loop 3 The gas recirculation loop exits the battery case from the gas space enters a micro pump that pumps it through a chamber containing two ultra-violet lights. This serves to recombine any free hydrogen with the chlorine. A small amount of gas bypasses the ultra-violet light chamber and passes through a manometer that acts as a failure detector. The flow rate of gas through this loop is 10x./min. Loop 4 Chlorine is stored during charge by forming chlorine hydrate in the store. Hydrate is formed by cooling the water in the store to 5°C (the temperature at which hydrate readily forms) by pumping cooled ethylene glycol through the heat exchanger in the store. The gas enters a heated inlet tube above an agitator which mixes the water and chlorine. The precipitated hydrate settles to the bottom of the store as it is formed. On discharge, warm electrolyte from the battery is circulated through a coil in the bottom of the store by a micropump to decompose the hydrate. The con trol manometers for the vent pump and decomposition pump are connected directly to the gas space. The store vent pump is turned on during charge when the store pres sure is high. The decomposition pump comes on in discharge when store pressure is low. CONTROLLER DESCRIPTION Objectively, the task of cycle testing the 1.7kWh battery required a completely hands-off, automatic control system. This meant repeatedly stepping the battery system through each charge/discharge cycle while controlling the auxiliary subsys tems as well as monitoring various battery operating parameters. There must be a provision for detecting the failure of a battery component or subsystem and safely terminating the test upon such occurrence. Also necessary, are data acquisition and visual display of battery parameters. The Cycle Controlling Regime consists of seven phases: • Cooldown - the store is lowered to the temperature range for hydrate formation. 25-6PDF Image | Development of the Zinc-Chlorine Battery for Utility
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