Since around 2007, the requirements on SLI OEM batteries for the automobile market have changed significantly in Europe and Japan due to the launch of new micro-hybrid vehicles. At that time, the 12-V stop–start system was introduced to eliminate idling losses when vehicles are at a stand-still. The conventional flooded SLI battery with the aim of being fully charged after a cranking event is unable to work in a micro-hybrid vehicle with stop–start and regenerative braking. Therefore, to function without issues in micro-hybrid operation, lead–batteries required significantly improved performance and durability. Accordingly, enhanced flooded batteries (EFBs) with greater battery power output, longer cycle-life under partial state-of-charge, better dynamic charge-acceptance (DCA) and other attributes were developed. These advances were achieved by improving both the active material density and the grid design and alloy, as well as by introducing additives to the active mass and/or the electrolyte. Nevertheless, the separator also plays a very important role in achieving the EFB requirements. This presentation reviews new developments in the Daramic polyethylene (PE) separator for EFB batteries. The Daramic separator should enable the design of an EFB battery that is both cost and performance competitive compared with VRLA–AGM batteries and with 12-V lithium-ion batteries which are becoming less and less expensive. The imminence of world-wide more stringent CO2 emission legislation, e.g,, 95 g km-1 for Europe in 2020, requires more and more vehicle electrification that the lead–acid battery industry must address to be competitive. For instance, battery durability and DCA demands under micro or 17.5 % DoD cycling will intensify to achieve the upcoming CO2 emission goals. Otherwise, 48-V or dual-battery systems, which are more expensive solutions, will be employed.
Global Technical Service
Dr Jörg Deiters graduated from is the Global Technical Service Director for Daramic LLC, which he joined 22 years ago after graduating from the University of Hannover in Germany. He also has a doctor of science in Chemistry from the University of Hannover. In his present position, Jörg is guiding and directing customer technical support and new product development efforts world-wide.