Battery vent

Chemistry: electrical current producing apparatus – product – and – Having specified venting – feeding or circulation structure – Venting structure

Patent

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Details

429 89, H01M 212

Patent

active

044004508

ABSTRACT:
An explosion-proof battery vent and filler plug (10) is disclosed, which provides a flame barrier (16) to prevent external ignition of gas evolved from a battery during operation from causing ignition of the larger volume of gas within the battery itself, without simultaneously allowing a high rate of evaporation of the electrolyte. In accordance with the invention, the flame barrier means (16) is provided with an indirect, restricted outlet (64) for the evolved gases to pass to the atmosphere, thus reducing the flow of air through the electrolyte space of the battery. The preferred embodiment includes a filler tube (14) with a funnel-shaped entrance (24) within a shell member (12) which sealingly engages an opening of a battery. Gas evolved from the battery during operation passes into a splash chamber, (46) then through a baffle (18) into an expansion chamber 52, and then flows through a microporous disk flame barrier (16) into an exit chamber, (65), and vents to the atmosphere through vent holes (64) which are substantially smaller than any previous passage through which the gas has passed, thus forming an indirect, a restricted outlet for battery gases, and a restricted inlet for air flow to limit the rate of evaporation of electrolyte.

REFERENCES:
patent: 3497104 (1970-02-01), White
patent: 3630788 (1971-12-01), Hennen
patent: 3723188 (1973-03-01), Hennen
patent: 4002496 (1977-01-01), Nitta et al.
patent: 4219612 (1980-08-01), Tatlock

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