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INTRODUCTION Section 32 EFFECTS OF ELECTRODE HEIGHT AND ELECTROLYTE STATIC HEAD ON CELL PERFORMANCE Each comb-type unit cell of present design contains 44 pairs of electrode faces. Each pair, in turn, is comprised of one PG-60 porous-graphite chlorine-electrode face and one ATJ dense-graphite zinc-electrode face. Electrolyte enters from the bottom and flows upward and is uniformly released through each pair of profiled porous-graphite electrodes. The electrolyte accumulating above the submerged electrodes is semi-quiescent in nature and will be hereafter referred to as the electrolyte "static" head. The operation of a zinc-chlorine cell requires the minimum static head height necessary to ensure full immersion of the electrodes. At a given electrolyte flow rate, the liquid height of this static head determines the horizontal flow velocity of the electrolyte across the top of the submerged electrode comb. For this reason the static head level may influence the fluid dynamic pattern of the electrolyte between pairs of electrodes, thereby affecting the corrosion rate of the zinc elec trodes. Optimum coulombic performance of zinc-chlorine batteries requires evalua tion of the significance of this effect. In the present peak-shaving battery design, the desired voltage and current from a battery module is achieved by arranging the required number of submodules in parallel. Possible performance variations within any submodule would, of course, affect the total usable energy of that battery module. These variations could be minimized through quality control and/or reducing the number of submodules. Increasing the electrode area within the unit cells of the submodule is one method of reducing the number of parallel-connected submodules required to obtain the same energy capacity 32-1PDF Image | Development of the Zinc-Chlorine Battery for Utility
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