THREE-REGION BATTERY SEPARATOR

摘要

Disclosed is a battery separator, comprising a coarse fiber region comprising fibers, such as glass fibers, having an average diameter of greater than or equal to 2 μm; a first fine fiber region comprising glass fibers having an average diameter of less than or equal to 2 μm, and a second fine fiber region comprising glass fibers having an average diameter of less than or equal to 2 μm, wherein the coarse fiber region is disposed between the first fine fiber region and the second fine fiber region, and wherein the thickness of the coarse fiber region constitutes 1-49% of the sum of the thicknesses of the coarse fiber region, the first fine fiber region and the second fine fiber region. Such a separator is useful, e.g., in a lead-acid battery, where during filling of the battery with acid, the separator enhances the diffusion of acid toward the interior region.

主权项

1. A battery separator, comprising:
a coarse fiber region; a first fine fiber region; and a second fine fiber region; wherein the coarse fiber region comprises fibers having an average diameter from about 2 to about 50 μm; wherein each of the first and second fine 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 coarse fiber region is larger than the average diameter of the fibers of each of the first and second fine fiber regions; wherein the coarse fiber region is disposed between the first fine fiber region and the second fine fiber region; and wherein the thickness of the coarse fiber region constitutes 1-49% of the total fiber region thickness.