Composite gauntlet/separator
AssigneeDaramic, LLC
InventorsWai M. Choi, Ingo W. Schmidt
Life of this patent
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Abstract
A battery separator for tubular positive electrodes composed of a microporous, composite sheet product having first and second major surface, formed from a uniform mixture of a polymer, a filler, a processing aid a porous form stable layer at least partially embedded in either the first or second major surface and having a series of vertical tubes arranged across its surface. The tubular sleeve/separator can be formed of individual tubes, flat sheets formed into a series of tubes or sheets containing half tubes and which are aligned and bonded together to form the series of tubes.
Claims16
A lead acid battery having a case, comprising:
- a flat plate negative electrode;
- a tubular positive electrode containing a center lead rod and active material surrounding the lead rod;
- an electrolytic composition;
- and a microporous separator surrounding said positive electrode and containing said active material, said separator comprising a first microporous layer having micropores of an average diameter of less than 1 micron, said microporous layer being formed of a substantially homogenous blend of a thermoplastic polymer and an inert filler, wherein the ratio (by weight) of polymer to filler is from about 1:2 to about 1:10, and a second form stable layer having pores of an average diameter of at least about 10 microns, said second form stable layer being at least 30% to 70% embedded in said first microporous layer to form an interface.
A composite microporous battery separator for a tubular positive electrode comprising a microporous filled plastic layer having micropores of an average diameter of less than 1 micron, said microporous layer having a first and a second major surface and comprising a substantially uniform mixture of from 1:4 to 1:10 wt. ratio of a polymer and an inert filler and having a porous form stable layer with pores having an average diameter of at least about 10 microns, said form stable layer being at least 30% to 70% embedded in at least one of the first and second major surfaces of the microporous layer, and having porosity throughout the separator's thickness and wherein the separator is capable of being formed into a series of one or more tubes for retaining one or more tubular positive electrodes.
A composite microporous battery sleeve separator comprising a composite sheet product having a first microporous thermoplastic layer having micropores of an average diameter of less than 1 micron,, the first layer having an inert filler present in a ratio of polymer to filler (by weight) from about 1:4 to 1:10;
- a second porous fibrous form stable layer having pores of an average diameter greater than 10 microns, said second layer being at least 30% to 70% embedded in a surface of the first layer, the separator being formed into a series of tubes having a sealed bottom and sides.
A positive battery electrode comprising:
- a.) a center lead rod;
- b.) active material surrounding the rod;
- and
- c.) one or more microporous tubular sleeve/separators surrounding and containing the rod and the active material, wherein the sleeve/separator is formed of a first microporous layer having micropores of an average diameter of less than 1 micron and comprising a siliceous filler, and a thermoplastic polymer and a second porous, form stable layer having pores of an average diameter greater than 10 microns, said second layer being at least 30% to 70% embedded in a surface of the first layer, and wherein the second layer of the sleeve/separator is adjacent to the active material of the electrode.
Dependencies are inferred from the claim text.