What is the function of the cellophane portion in the separator of a nickel-cadmium battery?

The cellophane portion in the separator of a nickel-cadmium battery primarily serves to inhibit heat from recombining oxygen. In a nickel-cadmium battery, the separator plays a crucial role in keeping the positive and negative electrodes apart while facilitating the movement of ions. During the charge and discharge cycles, gas can evolve, particularly hydrogen and oxygen. The cellophane acts as a barrier to restrain the heat generated when oxygen and hydrogen gas recombine, which can be a critical issue, especially under certain operating conditions.

This prevention of recombination not only helps maintain the safety and stability of the battery but also contributes to the overall efficiency and longevity of the battery. Managing heat effectively is essential in battery systems since excessive heat can lead to diminished performance and potential hazards. The ability of the separator to control the heat dynamics thus plays a fundamental role in the reliable operation of nickel-cadmium batteries.