Battery separator
AssigneeW. R. Grace & Co.
InventorsDennis D. O'Rell, Nan J. Lin
Life of this patent
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Abstract
A battery separator embossed with a configuration that is neither vertical corrugation or vertical rib and yet in which all of the surface areas of the two separator faces open or slant upwardly except the portions actually directly engaged against a battery plate. Thus all intended recesses in the faces of the battery separator are open at their upper extremity so that no gas can be trapped by the configuration of the battery separator embossment. Additionally the division portions between the embossed recesses on the positive plate engaging face are in continuous engagement with the positive battery plate from the bottom of the plate to the top of the plate which provides stability to the raised areas of the battery separator that engage the negative battery plate.
Claims29
In a battery separator comprising a porous sheet having at least one positive plate engaging face having a top and a bottom and at least one negative plate engaging face having a top and a bottom, said sheet being embossed to provide a reverse configuration of embossment on said positive plate engaging face and said negative plate engaging face, the improvement comprising having essentially all embossment walls opening continuously upwardly in the battery plate engagement areas and at least some of said embossment walls formed into a configuration angled from the vertical and comprising gas impeding restrictions on at least one of said faces, all restrictions being penetrated from their lower surface at its upper extremity.
A battery separator comprising a porous sheet having at least one positive battery plate engaging face having a top and a bottom and at least one negative battery plate engaging face having a top and a bottom;
- a plurality of series of interconnected recessed areas on at least one of said plate engaging faces, each of said series opening from the bottom of said one battery plate engaging face to the top of said one battery plate engaging face and comprising a plurality of wide recesses each of which has a width of about 1.5 to about 25 mm and a depth of about 0.125 to about 4.0 mm and a plurality of narrow recesses each of which has a width of less than about 3/4 the width of said wide recesses, at least one of said narrow recesses interconnecting two vertically displaced said wide recesses from the vertically upper most extremity of the vertically lower wide recess.
In a battery separator having a battery plate engaging face with a top and a bottom, the improvement comprising a plurality of raised spacing members that extend from said bottom to said top of said battery plate engaging face adjacent to one another, each of said spacing members having an outer extremity lying in a plane, being sinusoidal like in configuration in said plane, at least 75% continuous in said plane in extension from said bottom to said top of said battery separator face and isolated in said plane from adjacent raised spacing members.
An improved battery separator comprising a sheet comprised of thermoplastic resin and acid resistant porous inorganic filler, having a thickness of less than 1.0 mm and having embossed parts projecting outwardly more than 0.25 mm, said embossed parts extending in a plane for a linear distance of at least 2 cm and being shaped to enclose at least one area in said plane of less than 4 cm.sup.2, said enclosed area having at least two relief gap means oriented vertically above one another when said battery separator is placed in operable position in a battery cell, said relief gap means of sufficient depth and width to allow gas relief from said enclosed area when said area is closed by a battery plate.
Dependencies are inferred from the claim text.