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INTRODUCTION Section 27 SINGLE CELL LIFE TESTING The principle objective of single cell life testing is the determination of the useful life of zinc-chlorine cells operated under continuous charge-discharge cycle conditions. Inherently, it is the life expectancy and permanence of activation of the porous graphite chlorine electrode that are open to question. Single cell testing for peak-shaving applications has been an on-going program at EDA since 1975. A number of different cells, each reflecting the design state-of-the- art and the operational conditions of its time, have been placed on continuous cycle programs during that period. A detailed description of the test methods and evalua tion criteria, is presented in the EPRI EM-711 Interim Report (27-1). As Phase I began, only two cells (PCS-HB and PCS-MH2) remained on test. No new tests of single cells were begun during this period as emphasis has shifted toward the use of larger multi-cell systems for evaluating electrode life. These have the advantage of testing a large number of electrodes in the same period of time. RESULTS AND DISCUSSION The test time accumulated by each of the two cells, expressed as electrochemical 2 operational times in ampere-hours/cm , is presented in Table 27-1. Using a figure .2 of 0.2 ampere-hours/cm as a full-charge cycle, cell PCS-MH2 has accumulated, to date, the equivalent of 508 cycles. This cell continues on test. The testing of cell PCS-HB was terminated because of a mechanical failure after having amassed the equivalent of nearly 600 cycles. This failure, as with all previous cells of this design, was occasioned by a loss of contact with the chlorine electrode caused by loose bolts. During an attempt to correct this loss the chlorine electrode was 27-1PDF Image | Development of the Zinc-Chlorine Battery for Utility
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