Lead-acid safety battery cap

A battery cap for insertion into a fill port of a cell of a lead-acid electrical storage battery comprising:

• a hollow, barrel shaped body having upper and lower ends and formed with an upright, annular wall having an exterior configured to engage said fill port, a first snap fit engaging element on its inner surface at said upper end of said body, and said upper end of said body defines a circular mouth opening, an annular, transverse floor extending radially inwardly from said wall at said lower end of said body and including a central, annular downwardly bulging portion perforated by a central fluid passage opening therein, and said wall defines a radially inwardly projecting flame arrester seat located between said upper and lower ends of said body, and said wall further defines a plurality of gas escape ports beneath said mouth opening,
• a diverter located within said body and formed with a transverse plate having fluid passageways formed at its periphery, and a plurality of upright plate supports are formed as segments of an upright hollow cylinder, and said plate supports extend downwardly from said transverse plate to define radial fluid passage gaps therebetween, and said plate supports rest upon said floor of said body and straddle said central, fluid passage opening and hold said transverse plate directly above said downwardly bulging portion of said floor at a location spaced above said floor,
• a porous flame arrester disposed upon said flame arrester seat and extending across the interior of said tubular body and residing in contact with the interior surface of said upright wall throughout its circumference, and
• a top end closure disc having a second snap fit engaging element at its periphery, and said first and second snap fit engaging elements are engaged with each other at said top end of said body to bold said top end closure disc engaged with said wall to block said circular mouth opening of said body.

A battery cap for a fill port of a cell of a lead-acid electrical storage battery comprising:

• a hollow, tubular body formed with top and bottom ends and an upright tubular wall having an exterior and having and interior surrounding a central axis of longitudinal alignment, and said exterior of said wall is configured to engage said fill port, and the upper extremity of said interior of said wall forms an upper mouth opening at said top end of said tubular body and a lower end closure floor is formed at said bottom end of said body at the lower extremity of said wall, and a pair of laterally spaced gas escape ports are defined through said wall below said upper mouth opening and said interior of said wall forms a flame arrester seat located between said floor and said pair of gas escape ports, and said floor has a central, annular portion centered on said axis of longitudinal alignment and having a convex downwardly bulging exterior end face, and said central annular portion of said floor has a central, circular fluid passage opening therethrough,
• a diverter located within said tubular body and having a plate oriented perpendicular to said axis of longitudinal alignment and peripheral fluid passageways at its periphery and upright supports projecting downwardly from said plate, and said supports are shaped as arcuately curved segments of an upright cylinder centered on said axis of longitudinal alignment and said upright supports rest upon said floor at said central annular portion thereof to bold said plate in spaced separation from said floor directly above said central annular portion of said floor, and said supports define a pair of diametrically opposed, radial fluid passage gaps therebetween,
• a transverse, porous flame arrester located above said diverter and below said pair of gas escape ports and residing in contact with said wall throughout said interior thereof, and
• a body end closure that blocks said upper mouth opening and is secured to said wall at said top end of said body in interlocking engagement therewith.