Abstract: A vent valve for electric energy cells requiring pressure relief capability for gases formed within the cells due to overcharging or other circumstances includes a cover plate for the internal structure of the cell which contains a central relief aperture. A vent cap is affixed to the cover plate with one or more vent ports being provided. A resilient seal is provided between the vent cap and the cover plate for controlling the release of the gases, the seal being die-cut of a suitable corrosion-resistant material and having two parallel plane surfaces which contact the cover plate and the closed end of the vent cap when the cap and plate are joined. The seal is preferably of a polygon configuration and its vertices contact the walls of the cap for fixed positioning. The vent path for the gases is through the aperture in the cover plate, between the cover plate and the resilient seal, and out through the vent ports.

Abstract: An improved process for the electrolytic deposition of active material which may be in the form of a suitable metal hydroxide in a porous sintered nickel plaque, which in turn may be utilized to form the positive and/or negative electrodes of a nickel-cadmium battery. The process is characterized by the use of an organic acid such as formic acid as the buffering or support agent which effectively stabilizes the pH of the impregnating solution at an optimized value while at the same time avoids generating any particulate by-product which would otherwise contaminate the solution, thereby providing a virtually unlimited service life. Other advantages to the use of formic acid as the buffering material are disclosed as well.