SODIUM-SULFUR BATTERY

PURPOSE:To detect micro cracks of a solid electrolyte to prevent a reaction accident of sodium and sulfur by arranging an auxiliary electrode in an solid electrolyte such as beta-alumina. CONSTITUTION:A sodium-sulfur unit cell is formed using beta-alumina solid electrolyte 5 and filling molten sodiu...

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Bibliographic Details
Main Author GOTOU TADASHI
Format Patent
LanguageEnglish
Published 30.08.1984
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRICITY
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Summary:PURPOSE:To detect micro cracks of a solid electrolyte to prevent a reaction accident of sodium and sulfur by arranging an auxiliary electrode in an solid electrolyte such as beta-alumina. CONSTITUTION:A sodium-sulfur unit cell is formed using beta-alumina solid electrolyte 5 and filling molten sodium as an anode active material 4 in the inside of the solid electrolyte and molten sulfur as a cathode active material 6 in the outside. Metal meshes 11 and 12 are arranged, as auxiliary electrodes, in contact with inside and outside walls of beta-alumina. Meshes 11 and 12 are connected to a voltage detector 13. During normal operation, the same voltage as a battery is generated between both meshes 11 and 12, and this voltage is detected with a detector 13. In case micro cracks generate in beta-alumina and an active material penetrates into the cracks, short between both meshes 11 and 12 is detected by voltage drop of the auxiliary electrode.
Bibliography:Application Number: JP19830024622