H - Electricity – 01 – M
Patent
H - Electricity
01
M
319/24, 319/39
H01M 12/02 (2006.01) H01M 2/02 (2006.01) H01M 12/06 (2006.01)
Patent
CA 1068779
ABSTRACT OF THE DISCLOSURE An improved substantially leak-proof button cell, particularly adapted for use in hearing aids, comprising an outer cathode can and an inner anode can containing a zinc electrode material, preferably a zinc paste, the inner can being positioned within the outer can, with the outer wall of the inner can spaced from the inner wall of the outer can, a polymeric seal, preferably a polypropylene seal, positioned between the outer wall of the inner can and the inner wall of the outer can, the outer wall of the inner can having a coating of an alkali resistant elastomer or elastomeric adhesive, e.g. a self-curing butyl elastomer modified by a phenolic resin, which is pressure sensitive and having the property of deforming when subjected to pressure without cracking or forming voids, a catalyst electrode on a. flexible and permeable, preferably polytetrafluoroethylene, membrane and including a current collector, positioned between the polymeric seal and the inner wall of the outer can, and a separator between the zinc electrode material and the catalyst electrode. The outer wall of the inner can preferably is provided with a locking means such as a flange, to lock the seal onto such wall, and the seal, also coated with the above elastomeric adhesive, is preferably tapered downward and forms a leak-proof seal with the inner wall of the outer can, a collector mesh or wire from the catalyst electrode being exposed in contact with the inner wall of the outer cathode can. The button cell is fabricated by pressing the assembly of the inner anode can containing the zinc paste and the polymeric seal containing the coating of alkali or KOH resistant elastomeric adhesive, the separator and the flexible membrane with the catalyst electrode material thereon, by means of a plunger, down into the outer cathode can, until the flexible membrane of the catalyst electrode is disposed adjacent the bottom of the outer can. During this operation, the tapered seal increases the pressure along the vertical part of the inner wall of the outer can, to aid in sealing the assembly within the outer can, and the elastomeric coating deforms under pressure without cracking, resulting in a leak-proof seal. The tapered seal has a sharp upper edge which automatically trims the cathode, exposing the current collector to contact with the cathode can, and the upper edge of the outer cathode can is then crimped over the upper portion of the seal to provide the assembled button cell.
262110
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