Mineral filled seals for galvanic cells

Details Mineral filled seals for galvanic cells Mineral filled seals for galvanic cells

H - Electricity

01

M

319/109

H01M 2/08 (2006.01) H01M 2/12 (2006.01)

Patent

CA 1236518

MINERAL FILLED SEALS FOR GALVANIC CELLS ABSTRACT Mineral filled polypropylene (as a preferred embodiment, but also filled thermoplastic material that is inert to electrolyte, such as poly- propylene, polyethylene, copolymers thereof, and nylon) is used for injection molded seals for galvanic cells. The mineral is generally talc, (anhydrous magnesium silicate) but may be calcium carbonate or mica, or other electrolyte-inert material. The use of such material provides a seal through which hydrogen generated as a result of internal corrosion in the cell will permeate; and particularly so as to provide better molding conditions and wider tolerances of mechanical design. At the same time, since the bursting or rupture strength of a membrane of filled thermo- plastic material is lower and can be more easily predicted and controlled, and since a filled thermoplastic membrane will stretch less before rupture, a lower membrane bursting headroom may be designed for, and a larger volume of active material may be installed in the cell. Due to the lower coefficient of linear thermal expansion and the higher compressive strength of filled thermoplastic material, the cells may be more effec- tively sealed.

466035

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