Information AboutVented |
These batteries are often colloquially called ''sealed'' lead-acid batteries, but this term is misleading: a sealed battery would be a safety hazard due to Overpressure risks when Overcharging , and there is always a safety valve present, hence the name valve-regulated. Sealed is opposed to ''vented'' (also called ''flooded''). The name "valve regulated" does not really describe this technology. These are really "re-combinant" batteries. Which means that the Oxygen evolved at the positive will largely recombine with the Hydrogen ready to evolve on the Negative and thus prevent water loss. The Valve is only a safety feature in case hydrogen evolution crosses danger limits. This battery design utilizes much less electrolyte (battery acid) than flooded types, and is also sometimes referred to as acid 'starved'. One result of this design is that they provide a much higher density power-to-floorspace product, an obvious attaction over large, flooded type battery systems. Another is their high rate power capacity (although somewhat short duration). As a result, they are more often used in UPS (uninterruptible power system), or high rate, applications due to their design characteristics, rather than long duration applications such as telecommunications although there are designs on the market that fit these applications as well. |
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