Means of providing pressure relief to sealed galvanic cell

Details Means of providing pressure relief to sealed galvanic cell Means of providing pressure relief to sealed galvanic cell

1976-10-26

1978-02-21

Walton, Donald L.

Chemistry: electrical current producing apparatus, product, and

Means externally releasing internal gas pressure from closed...

Blowout type

220203, 296232, H01M 212

Patent

active

040753980

ABSTRACT:
The mouth of a tubular cell envelope is closed by compressing into it an end cap formed of a resilient plastic exhibiting a low creep characteristic. An elongate terminal is inserted through the end cap and into the cell interior, and a vent passage is formed in the cap at a location between the electrode and the cap edge. In one embodiment a plug is placed in the passageway before assembly of the end cap into the envelope such that the radial compression of the end cap by the surrounding envelope clenches the plug more tightly in the passageway. In a preferred embodiment, the plug is formed with a hollow core and the outer end of the passageway is counterbored or chamfered to allow the plug to be blown clear of the passageway by undesirably high pressure generated within the cell.

REFERENCES:
patent: 2227319 (1940-12-01), Pontis et al.
patent: 2301724 (1942-11-01), Vischer
patent: 2766408 (1956-10-01), Georgiev et al.
patent: 3013190 (1961-12-01), Nieders
patent: 4008354 (1977-02-01), Fitchman

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