Patent ID: 6410183
Filing Date: 2002-06-25
Classification: H01M,Y02E

Abstract:
A battery separator, comprising:a backweb of porous, acid resistant material, the backweb having opposed first and second planar surfaces and first and second outer edges, the first planar surface having first and second shoulder areas adjacent the first and second edges, respectively, and a major rib area positioned between the first and second shoulder areas; a plurality of major ribs extending outwardly from the first planar surface and confined within the major rib area; first and second sets of multiple mini-ribs extending outwardly from the first planar surface and confined within the respective first and second shoulder areas, the mini-ribs in the first and second sets running in a direction generally along the respective first and second outer edges, and adjacent mini-ribs in each of the first and second sets being of uniform height and shape and spaced apart by a uniform distance; each of the multiple mini-ribs in the first and second sets having a flat upper surface and a base joined by two sloping side walls, the upper surface bounded by curved opposite upper edges that merge with the sloping side walls and the base bounded by curved opposite lower edges that merge with the planar surface; and multiple micro-ribs extending outwardly from the second planar surface of the backweb, the micro-ribs running in a direction along the width of the second planar surface and adjacent ones of the micro-ribs spaced apart by a uniform distance.