Sealed Lead Acid

Gravitron will now supply very high quality sealed lead acid batteries. They consist of positive and negative electrodes and their accompanying separators that are wound in a spiral pattern shown in the diagram below. The electrodes consist of pure lead grids pasted with mixtures of lead oxides. These oxides are converted to the proper active materials when the cell receives its first charge in a process called formation. The pure lead supporting grids allow the flexibility needed for winding the plate and also give excellent corrosion resistance to prolong cell life. The separator consists of a fibrous glass mat.

The cell works on a starved electrolyte system where the quantity of electrolyte is limited to the amount that is either absorbed in the plates or wets the fibers in the separator. The result is open gas paths between the plates that allow gases evolved during overcharge to diffuse from one plate to the other where they are recombined. This recombination provides a closed system reducing venting of gases under normal overcharge conditions. A resealing safety vent is provided to handle pressure buildup during abusive overcharges. Since the electrolyte is recycled, the water loss that requires routine maintenance or limits life is minimized. The sealed-lead system has proven to provide high performance and long life in a clean, compact package.

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