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US 12,712,210 B2Granted
Laminated oxidation protected separator
AssigneeDaramic, LLC
InventorsEric H. Miller, J. Kevin Whear, John R. Timmons, Jeffrey K. Chambers, Pierre A. Hauswald
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Abstract
A battery separator for a lead acid battery addresses the issues of acid stratification and separator oxidation arising from contaminants. The separator includes a microporous membrane and a diffusive mat affixed thereto. The diffusive mat has a three hour wick of: at least about 2.5 cm. The diffusive mat may be made of synthetic fibers, glass fibers, natural fibers, and combinations thereof. The diffusive mat may include silica. The separator may include a rubber.
Claims19
A flooded lead acid battery comprising a battery separator that comprises:
- a microporous membrane comprising a microporous sheet of polyolefin, and wherein the microporous membrane is impregnated with uncured rubber, meaning that the uncured rubber is incorporated with a processing oil into the microporous membrane and is not a layer formed onto the microporous membrane;
- and
- a diffusive mat affixed to the microporous membrane, wherein said diffusive mat is made of natural fibers and optionally also includes synthetic fibers or glass fibers or combinations of glass and synthetic fibers;
- said diffusive mat further comprising a particulate filler and having an electrolyte wicking defined by a three hour wick of at least 2.5 cm and wherein the separator does not comprise a layer of rubber, wherein the diffusive mat faces or is in contact with a positive electrode or positive plate to improve oxidation resistance of the battery.
1 more element
Dependencies are inferred from the claim text.