Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Cell enclosure structure – e.g. – housing – casing – container,...
Patent
1981-10-05
1984-07-17
Lefevour, Charles F.
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Cell enclosure structure, e.g., housing, casing, container,...
429185, H01M 202
Patent
active
044606648
ABSTRACT:
An electrical feedthrough, including a metal ferrule, an electrical lead, a glass seal for centrally locating the electrical lead axially within ferrule, for electrically isolating the electrical lead from the ferrule and for hermetically sealing the feedthrough assembly, which further includes an injection molded insulating material extending between the ferrule and lead and a fluorocarbon washer positioned adjacent the inner surface of the glass seal. The fluorocarbon washer is capable of retaining helium and allows for the hermeticity leakage testing of the glass seal. Such a feedthrough is particularly useful in hermetically sealed electrochemical cells wherein the insulated portion of the feedthrough is placed in the cell and the uninsulated portion of the ferrule is welded to or forms the cell cover, and the electrical lead is electrically connected to cell components, such as the anode, within the cell.
The hermeticity testing of the aforementioned cell is accomplished by constructing the electrical feedthrough with the teflon washer in position; attaching the feedthrough to the hermetically sealed cells; placing the completed electrochemical cell in a pressurized atmosphere of a test gas, such as helium, for a period of time to force the test gas through the glass seal into the chamber containing the fluorocarbon washer, whereby the fluorocarbon washer absorbs helium gas; and examining the electrochemical cell for leakage of any of the helium back out through the glass seal. Gross and fine leakage testing may be accomplished by respectively observing the escape of the test gas at atmospheric pressure and drawing a vacuum on the electrical feedthrough and testing for the escape of the test gas with a mass spectrometer.
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Goodin Richard L.
Jurva Edsel O.
LeFevour Charles F.
Medtronic Inc.
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