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TEST DATA Currently a cycle is defined as a charge duration of greater than 4 hours, with a normal charge being 5 hours, and an energy efficiency equal to or greater than 60%. The test conditions for this cell are: a a • • m • • A failure charge current = 220 amps charge current density = 35.5mA/cm constant current discharge current = 190 amps constant current discharge current density = 30.8mA/cm 2 electrolyte flow rate = 1.86ml/min/cm or 12£/min dissolved Cl levels = 1.4g/i discharge temperature = 40°C 2 of this system could be one of two types, cycle failure or battery failure. Cycle failure refers to the concept of cycling being interrupted. There are two known causes of this, control equipment or auxiliary hardware breakdown. Control equipment failure could disrupt cycling (1) by sensing an error that does not exist and switching the system to standby, (2) by switching to the wrong phase or switching an auxiliary on or off at the wrong time and thus sensing a real error and shutting the system down, or (3) by losing power and dumping accumulated data. Auxiliary hardware includes pumps (seals, shafts, etc.) motors, solenoids, thermocouples, and manometers. Battery failure is defined as an inability to cycle due to the battery itself. This includes a loss in battery capacity (ability to charge for 5 hours at 2 35.5mA/cm ), failure to discharge properly (system totally unable to maintain a 190 amp discharge), or a large loss in efficiency (if mechanical and flow problems could all be dismissed, then this would indicate electrode deterioration). The 127 failures that occurred during the 15 month test program of Phase I are classified and tabulated in Table 25-2. To aid analysis and discussion, the individual failures, identified by the preceding cycle number, are grouped into discrete time periods (cycle intervals). Cycles 55-100 Cycle number 55 (2-3-77) was the first automated cycle. On February 28, 1977, (cycle number 58) attended 24-hour cycling began. On March 2, 1977, (cycle number 63) 25-9 2PDF Image | Development of the Zinc-Chlorine Battery for Utility
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