Abstract A method is described for forming a hermetic seal on a wet electrolytic device having a metal container and a metal closure member, and containing a liquid electrolyte. The method comprises placing the closure member in sealing position with respect to the container to form a seam between them, and electric resistance welding the container and the closure member together at a series of positions along the seam. During the welding operation at each welding position, the closure member and the container are pressed together at the portion of the seam being welded and that portion is bathed in a fluid, preferably the electrolyte used in the device, to provide uniform electrical conditions to the weld area. Typically, the container and closure member are made of tantalum. Also disclosed is a hermetically sealed electrolytic device of the type described above which is reduced in internal pressure at room temperature to permit the liquid electrolyte to expand upon heating of the device with less pressure buildup.
A sealed electrolytic device comprising a container and a closure member hermetically sealing said container, said Device including at least one electrode and an electrolyte within said container, and an atmosphere within said container having a pressure, at room temperature, below the atmospheric pressure external of said container, whereby said container is restrained against rupture when subject to adverse pressure conditions.
Claim 2
Dependent Claim
61 words
A sealed electrolytic device comprising a container and a closure member hermetically sealing said container, said Device including at least one electrode and an electrolyte within said container, and an atmosphere within said container having a pressure, at room temperature, below the atmospheric pressure external of said container, whereby said container is restrained against rupture when subject to adverse pressure conditions.
Claim 3
Dependent Claim
17 words
The sealed device of claim 1 in which said container and closure member are made of metal.
Claim 4
Dependent Claim
17 words
The sealed device of claim 2 in which said container and closure member are made of tantalum.
Claim 5
Dependent Claim
14 words
The sealed device of claim 1 in which said electrolyte is a liquid solution.