Porous ceramic battery vent
AssigneeGlobe-Union Inc.
InventorJulius Carl Hipp
Life of this patent
Estimating the term…
Abstract
A fired porous ceramic battery vent having a porosity and particle size distribution which can effectively permit the venting of cell gases in the battery while at the same time impede a flame from entering the battery container. The fired ceramic body is formed with a high melting point inorganic material containing aluminum and silicon oxides having a particle size no larger than about 600 microns. A lower melting point glass is used to fuse the particles together when in the fired state. The particle size of the high melting point material is important and ranges in size from 200 to 600 microns.
Claims7
A porous, fired ceramic battery vent in the form of fused homogenous particulate matter comprising:
- an inorganic filler material comprising individual particles having a particle size no larger than about 600 microns and being present in an amount of about 80% to about 95% by weight, said filler material containing aluminum and/or silicon oxide;
- a glass binder present in an amount of about 20% to 5% by weight, said binder having a melting point in the range of about 1,000.degree.F to 2,500.degree.F;
- said filler material having a melting point in excess of said binder material and having about 50% to 75% of the particles in the 400 to 600 micron range and about 50% to 25% of the particles in the 200 to 300 micron range;
- and
- said fired vent material having an open porosity of about 25% to about 50% and being substantially acid resistant.
A porous, fired ceramic battery vent in the form of fused homogenous particulate matter comprising:
- an inorganic filler material comprising individual particles having a particle size no larger than 600 microns and being present in an amount of about 80% to 95% by weight, said filler material containing aluminum and/or silicon oxide;
- a glass binder present in an amount of about 20% to 5% by weight, said binder having a melting point in the range of about 1,000.degree.F to about 2,500.degree.F;
- said filler material having a melting point in excess of said binder material and having about 25% to about 50% of the particles in the 200 to 300 micron range and about 75% to about 50% of the particles in the 300 to 400 micron range;
- and
- said fired vent material having an open porosity of about 25% to about 50% and being substantially acid resistant.
A porous fired ceramic battery vent in the form of fused homogenous particulate matter comprising:
- an inorganic filler material comprising individual particles having a particle size no larger than about 600 microns and being present in an amount of about 80% to 95% by weight, said filler material containing aluminum and/or silicon oxide;
- a glass binder present in an amount of about 20% to 5% by weight, said binder having a melting point in the range of about 1,000.degree.F to 2,500.degree.F;
- said filler material having a melting point in excess of said binder material and having about 45% by weight of the particles in the 600 to 400 micron range, about 45% by weight in the 400 to 300 micron range and about 10% by weight in the 300 to 200 micron range;
- and
- said fired vent material having an open porosity of about 25% to 50% and being substantially acid resistant.
Dependencies are inferred from the claim text.