Positive tubular plates of the lead―acid battery General analysis of the discharge process

摘要

A general analysis of the discharge process in stationary positive tubular plates of lead-acid batteries is described. In the experimental part, the influence of the rate of discharge and the sulfuric acid concentration on the potential/time (Eli) discharge curves, the variation of specific capacity and the plate resistance during the discharge transient was studied. The potential/time curves show the general pattern. The capacity is related to the complete discharge process and the plate resistance to the conditions in the transient plateau region of the potential/time curves. On this basis, it is shown that the tubular positive discharge behavior can be interpreted with a zone reaction model involving three steps. The first corresponds to the solid-state reaction from PbO_2 to PbO, with passage of current; the second, when the current effectively moved to a deeper surface zone of the pore in the plate, to the chemical reaction between the PbO and H_2SO_4 giving fundamentally disrupted PbSO_4, and the third, to a recrystallization of the disrupted PbSO_4. With the help of this model, the effect of the depletion of H_2SO_4 in the macropores is also analyzed. All the results are interpreted on the basis of the model.