Separator material for forming a separator for a lead-acid accumulator

摘要

The invention relates to a separator material (6) for forming a separator for a lead-acid accumulator, especially in the form of unfinished rolled product, and a method for the production thereof. The inventive separator material (6) comprises a first layer in the form of a microporous film (1) and at least one second layer in the form of a planar fleece material (7). At least one face of the microporous film (1), which is made of a thermoplastic material, is provided with a number of protrusions (2, 2′) defining an area with an increased film thickness on a basic film sheet. The fleece material (7) is welded to the film (1) by means of ultrasonic welding in such a way that the planar fleece material (7) is located at least at the level of the surface of the basic film sheet without invading the same in the area of the welded joints (8).

主权项

1. Separator material for forming a separator for a lead-acid accumulator, wherein the separator material comprises a first layer in the form of a microporous film, and at least one second layer in the form of a planar fleece material, wherein said first layer is made of a thermoplastic polyolefin and has a film base sheet and a number of central ribs having an initial height prior to being welded to said planar fleece material, each rib defining an area of increased film thickness, on at least one face of the film base sheet, said at least one second layer in the form of a planar fleece material being located on a face of said film having said central ribs, wherein said fleece material has a thickness of 0.25 mm or less and comprises glass fibers, polyester fibers or a mixture of glass fibers and polyester fibers and wherein the at least one planar fleece material is bonded to said film by a number of welded joints such that the planar fleece material is located at the level of the surface of the film base sheet in the area of the welded joints and does not penetrate into the film base sheet, said planar fleece material being bonded to at least some of said central ribs of said film by the welded joints, wherein the height of the at least some of the central ribs forming said welded joints is decreased relative to said initial height.