SPOT-WELDED FIBROUS SEPARATOR FOR BATTERY

摘要

A separator material for electrolytic cells and particularly for storage batteries comprising, a non-woven textile fabric of thermoplastic fibres and/or endless threads of thermoplastic which are themselves electrolyte-resistant, and in which the separator material is consolidated by spot welds through the material. The spot welds occupy about 2 to 40% of the total surface area of the consolidated material. Textile fabric separators consisting of one or more of a polyolefin, polyamide, polycarbonate and polyester fibres, or mixtures, or heterofilament fibres of these materials are described. The surface of the consolidated material may be profiled by employing two layers of non-woven textile material and inserting threads in the intervening spaces between the two layers and the spot welds.