Battery vent and pressure blowout relief frit
AssigneeCompagnie Plastic Omnium
InventorBernd Schulte-Ladbeck
Life of this patent
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Abstract
The present invention is directed to an improvement in a battery cover having a vent opening, the improvement is a frit that has two functions; namely, it acts to allow gases to escape while preventing liquid to escape and in addition acts as a blowout disk when a pressure within the battery exceeds a predetermined pressure that blows the frit out of the cover preventing the explosion of the battery.
Claims17
A lead acid battery cover adapted to seal an automotive vehicle battery casing having a design pressure maximum, the lead acid battery cover comprising:
- a rigid, porous frit consisting of modified polytetrafluoroethylene, wherein the frit allows gases to escape while preventing liquid from escaping and acts as a blowout disk when a pressure within said automotive vehicle battery casing exceeds a predetermined pressure that blows said frit out of said lead acid battery cover, wherein the predetermined pressure is within 5% to 10% of the design pressure maximum of the automotive vehicle battery casing;
- and
- restraining means for holding said frit in said lead acid battery cover until said predetermined pressure is exceeded,
- wherein the modified polvtetrafluoroethylene comprises Polytetrafluoroethylene, from 1 wt % to 35 wt % PMMA and from 1 wt % to 7 wt % lubricant.
A lead acid battery cover adapted to seal an automotive vehicle battery casing having a design pressure maximum, the lead acid battery cover comprising:
- a rigid, porous frit consisting of modified polytetrafluoroethylene, wherein the frit allows gases to escape while preventing liquid from escaping and acts as a blowout disk when a pressure within said automotive vehicle battery casing exceeds a predetermined pressure that blows said frit out of said lead acid battery cover, wherein the predetermined pressure is within 5% to 10% of the design pressure maximum of the automotive vehicle battery casing;
- and
- an O-ring for holding said frit in said lead acid battery cover until said predetermined pressure is exceeded blowing said frit out of said lead acid battery cover,
- wherein the modified polytetrafluoroethylene comprises polytetrafluoroethylene, from 1 wt % to 35 wt % PMMA and from 1 wt % to 7 wt % lubricant.
A lead acid battery cover adapted to seal an automotive vehicle battery casing having a design pressure maximum, the lead acid battery cover comprising:
- a rigid, porous frit consisting of modified polytetrafluoroethylene, wherein the frit allows gases to escape while preventing liquid from escaping;
- and
- a housing for holding said frit in said lead acid battery cover until a pressure within said battery casing exceeds a predetermined pressure that blows said frit out of said lead acid battery cover, wherein the predetermined pressure is within 5% to 10% of the design pressure maximum of the automotive vehicle battery casing,
- wherein the modified polytetrafluoroethylene comprises polytetrafluoroethylene, from 1 wt % to 35 wt % PMMA and from 1 wt % to 7 wt % lubricant.
A lead acid battery cover for an automotive vehicle battery casing having a design pressure maximum the lead acid battery cover comprising:
- a rigid, porous frit consisting of polytetrafluoroethylene, from 1 wt % to 35 wt % PMMA and from 1 wt % to 7 wt % lubricant, wherein the frit allows gases to escape while preventing liquid from escaping and acts as a blowout disk when a pressure within said automotive vehicle battery casing exceeds a predetermined pressure that blows said frit out of said lead acid battery cover, wherein the predetermined pressure is within 5% to 10% of the design pressure maximum of the automotive vehicle battery casing;
- and
- a lip on said lead acid battery cover for holding said frit in said lead acid battery cover until a pressure within said automotive vehicle battery casing exceeds said predetermined pressure that blows said frit out of said lead acid battery cover.
A lead acid battery cover adapted to seal an automotive vehicle battery casing having a design pressure maximum, the lead acid battery cover comprising:
- a cylindrical vent opening in said lead acid battery cover, and having a face in said cylindrical vent opening;
- a rigid, porous frit consisting of modified polytetrafluoroethylene, wherein the frit allows gases to escape through said cylindrical vent opening while preventing liquids from escaping through said cylindrical vent opening seated on said face;
- a groove in front of said frit containing an O-ring such that when a pressure within the automotive vehicle battery casing exceeds a predetermined pressure said frit is blown out of said cylindrical vent opening, wherein the predetermined pressure is within 5% to 10% of the design pressure maximum of the automotive vehicle battery casing,
- wherein the modified polytetrafluoroethylene comprises polytetrafluoroethylene, from 1 wt % to 35 wt % PMMA and from 1 wt % to 7 wt % lubricant.
Dependencies are inferred from the claim text.