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Lithium-bromine cell
| Details |
Inventors: Greatbatch, Wilson; Mead, Ralph T.; McLean, Robert L.; Rudolph, Frank W.; Frenz, Norbert W.;
Assignee: Eleanor & Wilson Greatbatch Foundation (Akron, NY)
Primary Examiner: LeFevour; Charles F.
Assistant Examiner:
Attorney, Agent or Firm: Christel & Bean
A lithium-bromine cell comprising a casing which can be of electrically conducting material and containing a lithium anode element from which a sealed conductor extends through the casing. A filling element which can be of electrically conducting material and which has a passage therethrough is fixed to the sealed casing with one end of the passage in communication with the interior of the casing and the other end externally exposed. Bromine is introduced through the passage to the interior of the casing into operative relationship with the lithium anode whereupon the passage is closed to complete the cell. The electrically conducting casing serves as a cathode current collector in operative contact with the bromine cathode, and after closing of the passage the electrically conducting filling element serves as an electrical terminal for the cell. An electrical potential difference exists between the terminal and the anode conductor during operation of the cell. |
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DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS Referring now to FIG.
1, a lithium-bromine cell according to the present invention comprises a casing 10 of metal such as stainless steel which preferably is shaped or otherwise formed to be hollow and generally rectangular in shape of an integral construction including a curved bottom portion 11, spaced-apart planar side wall portions 12, 13 extending from the bottom portion, and spaced-apart curved end wall portions 14, 15 also extending from bottom portion 11 and joining corresponding ones of the side wall portions 12, 13.
The bottom portion 11 is of compound curvature in that it is curved both in a direction between the side wall portions 12, 13 and also is curved in a direction between the end wall portions 14, 15.
This latter curvature of bottom portion 11 is of the same degree as the curvature of the end wall portions 14, 15 thereby defining a continuous, curved surface around along the casing.
The side wall portions 12, 13 are generally parallel.
The casing has an opened top or end opposite the bottom portion 11 which is sealed closed by means of a lid 17 also of metal such as stainless steel.
Referring now to FIGS.
2 and 3, the cell of the present invention further includes anode means comprising a pair of lithium elements or plates 22, 24 having an anode current collector element 26 sandwiched or positioned therebetween.
As shown in detail in FIG.
3, current collector 26 is a relatively thin, preferably a sheet of no.
12 mesh zirconium metal.
A conductor strip 28 of nickel or suitable metal is spot welded to collector element 26 along one edge thereof, and an electrical conductor 30 which can be of nickel, platinum or suitable metal is welded at one end to the strip 28 and is of sufficient length allowing it to extend out from the casing for making external electrical connection thereto.
Conductor 30 is sealed from the remainder of the cell by means including an insulator element generally designated 32 which surrounds lead 30 and has a first portion 34 which is sandwiched between the lithium plates 22, 24 and a secondor body portion 36 which is cylindrical and located between the lithium plates and lid 17 when the cell is completed
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