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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.

NHTSA investigating Bosch Power Xpress 240V EV chargers for fire risk

*UPDATED with Bosch's comment. Let's stamp out the flames of suspicion right up front. A new National Highway Traffic Safety Administration (NHTSA) investigation, while involving a 2013 Nissan Leaf and some smoke, is not about another EV fire. Not directly, anyway. "Nissan has determined by pictures that the car was not to blame for the incident" – NHTSA complaint This time, the subject of the NHTSA's lens is the Bosch Power Xpress 240V charging unit. NHTSA wants to know if an overheating charging cord caused smoke (NHTSA says there was no actual fire) in a Leaf owner's garage last fall. NHTSA says it will investigate, "to evaluate the scope, frequency, and consequence of the alleged defect." Up to 50 of the charging units could be involved, and NHTSA decided to act based on a single customer complaint that was filed in August 2013. The investigation opened April 15, so it will likely be a while before we know any more concrete details. For now, you can read the official details of the investigation and the original complaint - which says, "Nissan has determined by pictures that the car was not to blame for the incident. They are blaming the charging station for the failure. They have denied any warranty coverage. The burden of the bill has been placed with the customer" – below. Nissan's senior manager of corporate communications, Brian Brockman, sent AutoblogGreen a statement that says Nissan will work with NHTSA and Bosch and points out that, "This inquiry is focused on the electric vehicle charger and is directed at the charger supplier, Bosch." Requests for comment from Bosch were not returned, but we will update this post when we hear back. Bosch spokesperson Cheryl Kilborn told AutoblogGreen that, "Bosch is reviewing the filing and will work cooperatively with NHTSA as we seek to identify the root cause." INVESTIGATION Subject : Bosch EV charging cord overheating Date Investigation Opened: APR 15, 2014 Date Investigation Closed: Open NHTSA Action Number: PE14011 Component(s): ELECTRICAL SYSTEM All Products Associated with this Investigation close Equipment Brand NamePart No.

World's Strongest Man champion pulls a dozen Nissan Note hatchbacks to set record

On December 1, Zydrunas Savickas, a five-time World's Strongest Man champion, pulled 12 Nissan Notes (the equivalent to our Versa Note) weighing 28,530 pounds over 16.4 feet in 32.9 seconds. The feat, performed in Lithuania at the end of the country's Car of the Year test camp, was enough to secure him the Guinness world record for "Most Cars Pulled By One Man."
"Once I got into my stride pulling the 12 Nissan Notes, [it] was fine," Savickas said after the pull. "Obviously, a big thank you to Nissan for helping me set the record and making it all happen."
"We at Nissan like setting records and are always aiming high," said Taina Erkkilä, Communication Director of Nissan Nordic Europe. "Today we are delighted to have been able to help Zydrunas set another world record and see so many people turn out to support him."