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US 2006/0141350 A1Published application
Separator material for forming a separator for an acid accumulator
AssigneeDaramic, LLC
InventorsDaniel Dreyer, Jean-Martial Caublot
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AssigneeDaramic, LLC
InventorsDaniel Dreyer, Jean-Martial Caublot
Estimating the term…
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).
Separator material for forming a separator for a lead-acid accumulator, wherein the separator material (6) comprises a first layer in the form of a microporous sheet (1), which is made of a thermoplastic and has a number of protrusions (2, 2′), each defining an area of increased film thickness, on at least one face of a base sheet, and at least one second layer in the form of a planar fleece material (7) which is located on a face of the sheet (1) having such protrusions (2, 2′), and wherein the at least one planar fleece material (7) is bonded to the sheet (1) by a number of welded joints (8) such that the planar fleece material, (7) is located at least at the level of the surface of the base sheet in the area of the welded joints (8) and does not penetrate into this.
Separator material according to one of the preceding claims, characterized in that the microporous sheet (1) is made of a polyolefin.
Separator material according to one of the preceding claims, characterized in that at least 50′ of the pores of the microporous film (1) have a diameter of 0.5 μm or less.
Separator material according to one of the preceding claims, characterized in that the microporous sheet (1) has a thickness of from 0.1 to 0.6 mm in areas without protrusions (2, 2′).
Separator material according to one of the preceding claims, characterized in that the fleece material (7) substantially consists of glass fibres.
Separator material according to one of the preceding claims, characterized in that the fleece material (7) has a thickness of from 0.1 to 0.25 mm.
Dependencies are inferred from the claim text.