Alkali metal switch device

Chemistry: electrical current producing apparatus – product – and – With control means responsive to battery condition sensing...

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

429 92, 429104, 429122, H01M 200

Patent

active

047599987

ABSTRACT:
Sodium sulphur cells are commonly connected in parallel. It is a problem with such arrangements that if one cell sustains a short circuit failure, the parallel connected cells discharge through it. In an embodiment disclosed, a switch series connected to a cell or series of cells, goes open circuit should current in excess of a predetermined value and consequently associated with the failure of a cell, flow through the switch. The switch comprises a conducting rod separated into two portions and placed within a beta alumina tube containing sodium: the level of the sodium determines whether an electrical circuit is completed between the portions rendering the switch "on". Sodium, contained within an outer conducting tube, also surrounds the inner beta alumina tube, there being an electrical connection from the outer tube, via a resistor, to one portion of the rod. Should a current flow in a direction through the switch corresponding to discharge through a failed series connected cell, the arrangement is such that sodium within the inner tube is at a higher potential than sodium outside the inner tube. Accordingly, sodium cations flow out of the inner tube resulting in the lowering of the sodium level until the switch turns off, thus preventing further discharge through the failed cell.

REFERENCES:
patent: 2624033 (1952-12-01), Jacquier
patent: 3100862 (1963-08-01), Collier
patent: 4011366 (1977-03-01), Bones et al.
patent: 4124739 (1978-11-01), Sudworth
patent: 4217400 (1980-08-01), Leffingwell
patent: 4252869 (1981-02-01), Heitz et al.
patent: 4414297 (1983-11-01), Fischer

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Alkali metal switch device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Alkali metal switch device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alkali metal switch device will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-257654

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.