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From equation 19, this equation defined in terms of the current density in the electrolyte is m I cosh(mW-my) ,.2, t H sinh(mW) The standard-case values for the cell parameters were substituted into the current- density distribution equation. A graph of the results is shown in Figure 31-7. The broken line across the graph represents the average current density. The curve illustrates the distribution of current density across the width of the cell. The point of maximum current density is found at the side of the cell where the chlo rine electrode is anchored into the bus bar. This will be referred to as the "chlorine-bus" side. Similarly, the minimum current density is located at the "zinc-bus" side of the cell. It should be noted that, the deviation of the curve from the average current density at the chlorine bus is approximately twice the magnitude of the deviation at the zinc bus. The change in current density across the total cell width is found to be 18.9%. STANDARD CASE DISTANCE ACROSS CELL WIDTH—cm LU CC CC D O Q UJ N < 2 CC Oz Figure 31-7. The standard-case current-density distri bution. Note that the current density is highest on the chlorine-bus end of the zinc electrode. A normalized current density axis is also shown, as the value of the cell current does not affect the slope of the current-distribution curve. This allows for changes in the cell current to be readily calculated. For example, if the cell current is 2 increased to 3 amps, corresponding to an average current density of 50mA/cm , the 31-15 > wz UJ Q h- zPDF Image | Development of the Zinc-Chlorine Battery for Utility
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