Valve-regulated lead-acid batteries

摘要

Valve-regulated lead-acid (VRLA) batteries with gelled electrolyte appeared as a niche market during the 1950s. During the 1970s, when glass-fiber felts became available as a further method to immobilize the electrolyte, the market for VRLA batteries expanded rapidly. The immobilized electrolyte offers a number of obvious advantages including the internal oxygen cycle with accommodates the overcharging current without chemical change within the cell. It also suppresses acid stratification and thus opens new fields of application.