The cell is usually made in a tall cylindrical configuration. The entire cell is enclosed by an inert metal container and sealed at the top with an airtight alumina lid. The cell becomes more economical with increasing size. In commercial applications the cells are arranged in blocks for better conservation of heat. Once running, the heat produced by charging and discharging cycles is enough to maintain operating temperatures and no external source is required.
An NAS battery has a high energy density and high efficiency of charge/discharge, and is made from inexpensive, non-toxic materials. However, the operating temperature of 300-350 °C and the highly corrosive nature of sodium make it suitable only for large-scale non-mobile applications. One such application is the storage of energy storage, during off-peak times, in the electric grid.
Related category• BATTERIES
Home • About • Copyright © The Worlds of David Darling • Encyclopedia of Science • Contact