Abstract
Hermetically closed alkaline secondary batteries depend on the precisely correct dimensions of the electrodes, and on excluding absolutely the evolution of hydrogen under all practical conditions. Whereas safety requirements against polarity reversal are limited to special cases, breakdown-free functioning must be absolutely guaranteed during overcharge, during normal use and during standby periods. To assure this, the negative electrode must be equipped with a suitable active mass and must have a matched capacity, divided properly into charge reserve, utilizable capacity and discharge reserve. The capacity on correlates closely with the charge condition at the moment when the cell is hermetically closed.
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