16ELBC PRESENTATIONS: DARAMIC Kevin Whear, vice president of technology at Daramic will describe how the firm has made various breakthroughs in the ability of lead acid batteries to operate in a partial state of charge and also bettering dynamic charge acceptance.
Pushing back the boundaries of PSoC and DCA Kevin Whear, vice president of technology at Daramic, will update ELBC delegates on the company’s latest advancements in getting lead acid batteries to perform better in a partial state of charge — and how it has made breakthroughs in dynamic charge acceptance performance. In a presentation called ‘Advancement in Separator Development for Batteries Operating in Partial State of Charge’, Whear will discuss the implications of the challenging demands on lead acid batteries — and what Daramic has been doing to meet these demands. In the last five years specifically, the industry has witnessed electrification playing a more and more important role and the lead acid battery has been asked to deliver more power in an efficient and sustainable manner from automotive, motive power and not forgetting deep cycle applications. As a result, the battery is working in a more stringent environment than ever before and operating in a partial state of charge. This has meant challenges on acid stratification, poor charge acceptance, reduced electrical performance of the battery and likely result in shorten life In this presentation, a review will be given of the global market and technology challenges associated with partial state of charge. It will describe the mechanism of how those problems happened and the impact to the battery and battery ecosystem.
Daramic has developed several solutions to overcome some of these challenges in recent years. Daramic EFS, its new line-up of separators, for example, is specifically designed to support start-stop vehicle battery by reducing battery internal resistance and improving voltage drop and CCA.
Daramic RipTide
“We have now increased battery life by two to three times in a partial state of charge” — Kevin Whear, Daramic Through the separator’s lens, potential solutions will be offered by Whear with respect to ways whereby lead acid batteries can be enhanced with leveraging the motion nature in certain key applications and therefore, can be used more efficiently in these applications without sacrificing life and performance. He will also indicate the new lead acid battery lab test method to better simulate the working environment of battery in the field and bridge the gap between lab data and actual market performance.
20 • Batteries International • 16 ELBC Show Guide • Summer 2018
Meanwhile, Daramic RipTide combines the latest innovations of Daramic with novel separator profile designs using advanced computational fluid dynamics computer modelling to enhance enhanced flooed product durability. It does this by reducing acid stratification in partial state of charge environment which is more typical in a start-stop application.
In essence, it uses motion to mix the acid s within the battery by using a series of ‘ribs’ integrated into the battery’s design. At ELBC, Whear will describe some further innovations it has now made on this front. One of the problems Daramic encountered was that although the acid was being mixed, the batteries were still not lasing as long as they should because the negative active material was swelling. To realise the full effects of the acid being mixed, they needed to understand what was causing this and how to reduce it. They achieved this by putting even more ribs in place on both the separator and the connection between the positive and negative plates.
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