Separators, lead acid batteries, and methods and systems associated therewith
Disclosed herein are novel or improved separators, battery separators, lead acid battery separators, batteries, cells, and/or methods of manufacture and/or use of such separators, battery separators, lead acid battery separators, cells, and/or batteries. In accordance with at least certain embodiments, the present disclosure or invention is directed to novel or improved battery separators for lead acid batteries. In addition, disclosed herein are methods, systems and battery separators for enhancing battery life, reducing water loss, reducing float current, minimizing internal resistance increase, reducing failure rate, reducing acid stratification and/or improving uniformity in at least lead acid batteries. In accordance with at least particular embodiments, the present disclosure or invention is directed to an improved separator for lead acid batteries wherein the separator includes improved coatings, improved configurations, and/or the like.
1. An improved battery separator for reducing floating charges, reducing water electrolysis, and/or reducing rates of water loss in lead acid batteries comprising:
a polyolefin porous membrane; and
at least one additive at a density of at least 5.0 g/m 2 , and wherein the at least one additive is at least one surfactant and a sulfo-succinate; and
a ZnSO 4 coating on a surfactant coating at a coating density of 3.0 g/m 2 , and
wherein the ZnSO 4 coating on the surfactant coating is on a side of the polyolefin porous membrane facing a negative electrode, a side of the polyolefin porous membrane facing a positive electrode, or on both sides of the polyolefin porous membrane
wherein the additive and ZnSO 4 coating form a homogenous layer.
2. The separator according to claim 1 , wherein the polyolefin porous membrane is at least one of a porous, microporous, mesoporous, or macroporous membrane.
3. The separator according to claim 1 , wherein the polyolefin porous membrane comprises polyethylene or comprises ultrahigh molecular weight polyethylene.
4. The separator according to claim 1 , wherein the at least one surfactant comprises a non-ionic surfactant.
5. The separator according to claim 1 , wherein said polyolefin porous membrane has a backweb and ribs on at least one side thereof.
6. The separator according to claim 1 , further comprising a fibrous layer that is present on at least one side of the polyolefin porous membrane.
7. The separator according to claim 6 , wherein the fibrous layer comprises glass fibers.
8. The separator according to claims 6 , wherein the fibrous layer is present on both sides of the polyolefin porous membrane.
9. The separator according to claim 6 , wherein the fibrous layer is from 0.3-1.25 mm thick.
10. A method of reducing failure in a lead acid battery, wherein the method comprises providing a separator according to any of claim 1 .