Predictions from Macrohomogcneous Model of Aerospace Ni-Cd Battery

The mathematical moclel developed at Texas A &. M University (Tw for a sealed nickel-cadmium cell is modified to enable predictions of an aerospace nickel-cadmium batte~ under any desired charge-discharge schedule. The cell model is based on a macrohomogeneous description of porous electrodes and takes into account various processes such as mass transport in the liquid phase, charge transfer and solid-state. diffusion of proton in the nickel oxide. The relevant equations for the above processes are solved by a numerical approach. In this paper, the various parameters describing the above phenomenon have been optimized to obtain a closer prediction of the charge-discharge behavior of an aerospace cell. Upon optimizing the model parameters, the peflormance of the aerospace nickel-cadmium cell is simulated under various experimental conditions, i.e., at different rates and temperatures. Finally, generic Ragone plots for the cell and typical Ttiel plots for cadmium and nickel electrodes at various state of charge are constructed from the simulations and compared with the experimental data,