Multi-region battery separators

摘要

Disclosed is a battery separator, comprising two fiber regions comprising glass fibers, and a middle fiber region disposed between them comprising larger average diameter fibers and specified amounts of silica, or fine fibers, or both; and processes for making the separator. Also disclosed is a battery separator, comprising a fiber region and either one or two silica-containing region(s) adjacent thereto, each of the regions containing a specified amount of silica; and processes for making the separator. Such separators are useful, e.g., in lead-acid batteries.

主权项

1. A battery separator, comprising:
a middle fiber region; a first peripheral fiber region; and a second peripheral fiber region; wherein the middle fiber region comprises fibers having an average diameter from 2 to about 50 μm; and wherein each of the first and second peripheral fiber regions independently comprises glass fibers having an average diameter from about 0.1 to about 2 μm; provided that the average diameter of the fibers of the middle fiber region is larger than the average diameter of the fibers of each of the first and second peripheral fiber regions; wherein the middle fiber region is disposed between the first peripheral fiber region and the second peripheral fiber region; wherein the thickness of the middle fiber region constitutes 1-49% of the total fiber region thickness; and wherein the separator exhibits an acid filling time of about 17 to about 155 seconds.