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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.

Nissan Sport Sedan Concept foretells a future Maxima

Nissan is in the midst of overhauling its design language. We got our first glimpse at the direction its style was going a year ago with the Resonance crossover concept, which was followed in Shanghai by the connected-car Friend-Me hatchback concept. And now, after dropping a few hints, Nissan has revealed the third in this developing series.
Unveiled at today's Detroit Auto Show, the new Sport Sedan Concept applies many of the same design elements we've seen on Nissan's previous show cars to a more conventional four-door shape. But far from a design exercise, the decidedly uncreatively named Sport Sedan Concept previews "a future production sports sedan," which has every indication of being the next Maxima.
Its dimensions reveal the concept to be bigger than the current Maxima in every direction but height, with that visual impression further entrenched by a floating roof design that combines with a high waistline to give a coupe-like profile. There are also sharp creases in the bodywork that visually break up the space between the rear set of 21-inch alloys and the tapered greenhouse. The shape is further punctuated by the V-shaped grille and distinctly Nissan boomerang-shaped lights that lend a face to this distinctly Japanese design that was penned in California and honed back in Japan. The sharp and simple cabin is characterized by a high-contrast palette with quilted leather and metallic trim.

Nissan Xterra's fate hangs in the balance

The Nissan Xterra might not be long for this world, according to a report from Edmunds. The rugged SUV, which has always been a bit more of a hardcore, purpose-built vehicle than the rest of the Nissan SUV range. But it has also suffered from slowing sales, low fuel economy relative to the competition and general neglect, as Nissan has focused on other offerings in its range.
"There are plans to replace it, there are always plans, (but) I am not sure it will happen. I would say in the next six months to a year," Pierre Loing, vice president of product planning for Nissan Americas told Edmunds. Part of the problem, he added, was that the Xterra is a US-only vehicle, which makes it a hard sell in a world where automakers are increasingly depending on global cars.
Besides the economic forces working against the Xterra, it's just a vehicle that hasn't been a huge sales success of late. Customers are more conscious of fuel economy and a body-on-frame SUV that only nets 16 miles per gallon just isn't good enough; arguably why Nissan barely sold 17,000 units last year. We can hold out hope, as the Xterra remains a fun off-roader that we'd hate to see go, but unless Nissan finds a business case or some global partners, this is a vehicle that is on its last leg.