Lead-acid battery separators with improved performance and batteries and vehicles with the same and related methods
Improved battery separators are disclosed herein for use in flooded lead-acid batteries, and in particular enhanced flooded lead-acid batteries. The improved separators disclosed herein provide for enhanced electrolyte mixing and substantially reduced acid stratification. The improved flooded lead-acid batteries may be advantageously employed in applications in which the battery remains in a partial state of charge, for instance in start/stop vehicle systems. Also, improved lead-acid batteries, such as flooded lead-acid batteries, improved systems that include a lead-acid battery and a battery separator, improved battery separators, improved vehicles including such systems, and/or methods of manufacture and/or use may be provided.
1. A stop/start flooded lead acid battery separator comprising;
a backweb having at least three zones of varying serrated, dimpled, and/or broken rib patterns on at least one side thereof;
wherein said ribs being defined by an angular orientation, relative to a machine (or vertical) direction of the battery separator and said angular orientation is an angle chosen from the group consisting of between greater than zero degrees and less than 180 degrees, and greater than 180 degrees and less than 360 degrees and wherein at least three of the zones have ribs with different angular orientation; and
wherein when placed into the stop/start flooded lead acid battery, the battery exhibits a difference in electrolyte density at a top portion of the separator and electrolyte density at a bottom portion of the separator of less than 50% after the battery has undergone from 30 to 90 start/stop cycles.
2. The battery separator of claim 1 , comprising three zones of varying serrated, dimpled, and/or broken rib patterns.
3. The battery separator of claim 1 , comprising more than three zones of varying serrated, dimpled, and/or broken rib patterns.
4. The battery separator of claim 1 , wherein each zone comprises two or more rows of serrated, dimpled, and/or broken ribs, wherein the rows are machine-direction rows or cross-machine direction rows.
5. The battery separator of claim 1 , wherein the zones change in a lateral direction along a cross-machine direction of the separator or change in a machine direction of the separator.
6. The battery separator of claim 5 , wherein the zones change in the lateral direction along a cross-machine direction of the separator.
7. The battery separator of claim 5 , wherein the zones change in a machine direction of the separator.
8. The battery separator of claim 1 , comprising zones of varying broken ribs.
9. The battery separator of claim 1 , wherein the ribs disposed at an angle are disposed at an angle from 45° to 135° relative to a top edge of the separator.
10. The battery separator of claim 1 , wherein a height of the ribs disposed at an angle is from 2 to 12 mm.
11. An improved stop/start flooded lead acid battery comprising the battery separator of claim 1 .
12. The battery separator of claim 1 , comprising transverse mini-ribs on at least one side of the backweb.