Chemistry: electrical current producing apparatus – product – and – With measuring – testing – or indicating means – For charge or liquid level
Patent
1984-02-17
1986-03-25
LeFevour, Charles F.
Chemistry: electrical current producing apparatus, product, and
With measuring, testing, or indicating means
For charge or liquid level
429104, 429120, 429191, 429121, H01M 1048
Patent
active
045783250
ABSTRACT:
A sodium-sulfur battery comprising molten sodium as an active material for a minus pole and molten sulfur as an active material for a plus pole, the molten sodium and molten sulfur being partitioned from each other by a sodium ion-permeating solid electrolyte such as .beta.-alumina as a boundary is provided with a sodium storage tank communicated with the molten sodium in the battery cell, a draining mechanism for withdrawing the molten sodium, when desired, from the battery cell into the sodium storage tank, and a circulating mechanism for purifying and returning the sodium from the sodium storage tank to the battery cell as the molten sodium, sodium can be discarged urgently from the battery at an accident of direct contact between the sodium and sulfur, with the result of improved safety. A power storage system comprising a plurality of the sodium-sulfur batteries connected to one another in series and further connected in parallel can be provided with common sodium storage tanks and relevant draining mechanisms, purifying and circulating mechanisms in equal potential level rows of the batteries, resulting in improved economy and safety.
REFERENCES:
patent: 3535163 (1970-10-01), Dzieciuch et al.
patent: 3837918 (1974-09-01), Nakabayashi
patent: 4006281 (1977-02-01), Markin
patent: 4038465 (1977-07-01), Ludvig
patent: 4044191 (1977-08-01), Evans et al.
patent: 4424262 (1984-01-01), von Alpen et al.
Gotou Tadashi
Kawamura Fumio
Sagawa Norihiko
Yusa Hideo
Hitachi , Ltd.
LeFevour Charles F.
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