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English A Constant, equation 32 B Constant, equation 28 H Cell height i Current in a differential element I Total cell current J Current density k Constant, equation 5 m Constant, equation 26 R Resistance V Voltage in a differential element V Voltage w Cell width Greek 6 Thickness A Differential element P Resistivity Subscripts b Bus (Cl or Zn) c Charge (voltage) d Zinc deposit e Inter-electrode gap f Cl electrode-bus contact g Cl electrode k IR-free (polarization) o Zn-electrode (polarization) Cl -electrode (polarization) r Reversible (voltage) s Zn-electrode substrate t Defined by equations 6 and 7 X Zn electrode-bus contact Distance from Cl^-bus along cell width z Zn electrode Table 31-1 TERMINOLOGY considerations, these losses are assumed to be equal. Each chlorine and zinc elec trode has a voltage loss, and respectively, associated with a constant resis tance between the electrodes and the bus bars. It is assumed that these contact and bus-bar resistances are constant along the height of the cell. Since the elec trodes are anchored to the bus bars continuously along the cell height, a current- density variation along the cell height is assumed to be negligible. The uneven distribution of current across the cell is the result of the difference in the voltage drops across the chlorine and zinc electrodes, and respec tively, over the active width of the cell. The electrode resistances are similar at the initiation of charge, as both the chlorine- and zinc-electrode substrates 31-4 p YPDF Image | Development of the Zinc-Chlorine Battery for Utility
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