Article,

Safety Test Results of Sodium-Sulfur Battery for Utility Load-Leveling Applications

, and .
(1995)

Abstract

Safety is one of the most important factors for the sodiumsulfur battery. Therefore, consideration must be given to emergencies: fire, flood, dropping, etc.; as well as problems occurring during normal operation: overloads, mishandling, disorders, etc. This paper presents safety design concepts and results of proof tests for safety items related to our sodium-sulfur battery. A sodium electrode design which minimizes the direct reaction between the sodium and the sulfur, caused by betaalumina tube breakage, secures the safety of the cells, and suppresses temperature rise by an external short-circuit. Fuses ensure the safety of the batteries having hundreds of connected cells in case of an external or internal short-circuit. The overcharge breakdown and short-circuit tests using cells and batteries verified the above-mentioned safety features. In addition, the forced internal burning, external flame, dropping, and flood tests proved that our sodium-sulfur batteries have sufficient safety features.

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