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DC fast charging not as damaging to EV batteries as expected

As convenient as DC fast charging is, there have been lots of warnings that repeated dumping of so many electrons into an electric vehicle's battery pack in such a short time would reduce the battery's life. While everyone agrees that DC fast charging does have some effect on battery life, it may not be as bad as previously expected. Over on SimanaitisSays, Dennis Simanaitis, writes about a recent presentation by Matt Shirk of the Idaho National Laboratory (INL) called DC Fast, Wireless, And Conductive Charging Evaluation Projects (PDF) that describes an ongoing test of four 2012 Nissan Leaf EVs that are being charged in two pairs of two. One pair only recharges from 50-kW DC fast chargers, which the other two sip from 3.3-kW Level 2 chargers exclusively. Otherwise, the cars are operated pretty much the same: climate is automatically set to 72 degrees, are driven on public roads around Phoenix, AZ and have the same set of dedicated drivers is rotated through the four cars. "Degradation depends more on the miles traveled than on the nature of recharging." What's most interesting are the charts on page seven of Shirk's presentation (click the image above to enlarge), which show the energy capacity of each of the four vehicles. When they were new, the four batteries were each tested to measure their energy capacity and given a 0 capacity loss baseline. They were then tested at 10,000, 20,000, 30,000 and 40,000 miles, and at each point, the DC-only EVs had roughly the same amount of battery loss as the Level 2 test subjects. The DC cars did lose a bit more at each test, but only around a 25-percent overall loss after 40k, compared to 23 percent for the Level 2 cars. Simanaitis' takeaway is that, "INL data suggest that the amount of degradation depends more on the miles traveled than on the nature of recharging." The tests are part of the INLs' Advanced Vehicle Testing Activity work and a final report is forthcoming. These initial numbers from IPL do mesh with other research into DC fast charging, though. Mitsubishi said daily fast charging wouldn't really hurt the battery in the i-MiEV and MIT tests of a Fisker Karma battery showed just 10-percent loss over 1,500 rapid charge-discharge cycles.

Dongfeng-Nissan surprises with Viwa Concept EV for Venucia

Nissan has a joint venture in China with Dongfeng to make passenger vehicles, and last year the two companies created a sub-brand called Venucia that aims to roll out five cars by 2015. With the gasoline-engined D50 and R50 and a pilot program for the E30 electric car already out, this little orange beast, the Viwa EV concept, could point the way to a future offering.
Looking like a Chevrolet Spark that spent the weekend raving in Ibiza, the Venucia Viwa EV aims to be reliable, practical, efficient and accessible all in one package. Beyond the practical bit, defined as, "packaged with a compact body for easy driving," Venucia hasn't said how any of those other qualities are achieved. In fact, it hasn't even divulged the specifics of the electric powerplant. However, it does say that it will be developing more EVs under the guide of "China's new energy vehicle policy."
You can get a little more info about it in the press release below, or discover the little peach in the high-res gallery above.

Alfa Romeo Giulia Quadrifoglio and Nissan 370Z 50th Anniversary | Autoblog Podcast #600

In this, the 600th episode of the Autoblog Podcast, Editor-in-Chief Greg Migliore is joined by Senior Editor, Green, John Beltz Snyder and Associate Editor Joel Stocksdale. They've been driving the Nissan 370Z 50th Anniversary edition, Alfa Romeo Quadrifoglio and Buick Enclave, and they're pretty excited about at least two of them. Then they talk about the Subaru Forester in their long-term garage. Finally, they spend a listener's money on a used car. Autoblog Podcast #600 Get The Podcast iTunes – Subscribe to the Autoblog Podcast in iTunes RSS – Add the Autoblog Podcast feed to your RSS aggregator MP3 – Download the MP3 directly Rundown 2020 Nissan 370Z 50th Anniversary 2019 Alfa Romeo Giulia Quadrifoglio 2020 Buick Enclave Long-term Subaru Forester Update Spend My Money Feedback Email – Podcast@Autoblog.com Review the show on iTunes Related Video: