Sodium-sulfur battery
AssigneeYugenkaisha Chuseigiken
InventorHiroshi Ohkawa
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Abstract
A sodium-sulfur battery includes a partition wall formed of a solid electrolyte, a cathode chamber formed on one of opposite sides of the partition wall, an anode chamber formed on another one of the opposite sides of the partition wall, sulfur accommodated in the cathode chamber, sodium some of which is accommodated in the anode chamber, a sodium container accommodating most of remaining sodium, and a communication passage communicating the anode chamber with the sodium container, and including a finely-perforated portion extending into the sodium container and opening inside the sodium container. Moreover, the communication passage further includes a shutoff portion for closing the communication passage itself.
Claims4
A sodium-sulfur battery comprising:
- a partition wall comprising an beta-alumina solid-electrolyte;
- a cathode chamber formed on one of opposite sides of the partition wall;
- an anode chamber formed on another one of the opposite sides of the partition wall;
- sulfur accommodated in the cathode chamber;
- sodium, wherein some of the sodium is accommodated in the anode chamber;
- a sodium container accommodating most of remaining sodium;
- and
- a communication passage comprising a finely-perforated portion which communicates the anode chamber with the sodium container;
- wherein the communication passage further comprises a shut-off structure provided with:
- a finely-constricted portion;
- and a float whose density is higher than a density of sodium and is lower than densities of sulfur and sodium sulfide, and which closes the finely-constricted portion by being floated with the sulfur or sodium sulfide infiltrating into the communication passage through a damaged site when the partition wall is damaged.
Dependencies are inferred from the claim text.