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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 shares slide 5% after report Renault exploring stake reduction

TOKYO — Shares of Nissan Motor Co slumped 5% on Monday, their biggest fall in more than a month, following a report that top shareholder Renault may consider lowering its stake in the Japanese automaker. Bloomberg reported on Friday that Renault may consider lowering its Nissan shareholding as part of plans to separate its electric vehicle business. The French car maker has been pushing ahead with plans to split its electric and combustion-engine businesses in an attempt to catch rivals such as Tesla and Volkswagen On Friday, Renault said all options were on the table for separating the electric vehicle business, including a possible public listing in the second half of 2023. Any plans would be subject to approval from alliance partner Nissan, Renault finance chief Thierry Pieton said, adding the Japanese automaker was "in the loop" as Renault weighed up its options. Renault and Nissan have declined to comment on the report. Shares of Nissan fell to 509.8 yen in Tokyo, marking their biggest one-day decline since early March and underperforming an almost 2% drop in the Nikkei index. The car makers' two-decade-old alliance, which includes Mitsubishi Motors, was rocked by the 2018 ouster of alliance founder Carlos Ghosn amid a financial scandal. They have since pledged to pool more resources. In January they said they would work more closely together to make electric cars. They detailed a $26 billion investment plan for the next five years. But their unequal relationship has long been a source of friction in Japan. Renault owns 43.4% of Nissan, which in turn has a 15% non-voting stake in its shareholder. Renault bailed out Nissan two decades ago, but is now the smaller automaker by sales. Related video: This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Earnings/Financials Green Mitsubishi Nissan Renault

Ghosn shares 'truth about Autonomous Drive cars'

Drive our cars. No, wait, don't drive our cars. Nissan chief Carlos Ghosn is delivering a message about autonomous driving that's less mixed than it sounds on the surface. As part of his public dialogue from LinkedIn's "Influencer" series, Ghosn said in a company announcement that "hands-free" driving is part of the Japanese automaker's "near-term technology." In fact, cars that can self-drive in heavy, stop-and-go traffic, may be ready for the market by late 2016. That should please texters everywhere. 2018 may be the year cars with lane-changing, hazard-avoiding capabilities will see the light of day, while by 2020, Nissan may feature a "complete package" of autonomous-driving features, Ghosn writes. As for the proverbial driver-less car? That's at least a decade out but ultimately likely, according to Ghosn. Nissan said early last year that some autonomous versions of its vehicles may be available in the US by the end of the decade, and that it was in talks with California regulators about the idea of self-driving cars on the state's roads. Nissan has worked with institutions such as MIT, Stanford and Oxford at developing autonomous-drive concepts, and has tested self-driving versions of the Leaf electric vehicles in Japan. Check out excerpts of the Ghosn "interview" below. The truth about Autonomous Drive cars, by Carlos Ghosn The following is the latest from Carlos Ghosn's LinkedIn Influencer series. Read all of Mr. Ghosn's LinkedIn Influencer articles here. There has been a lot of talk in the media recently about "Autonomous Drive" technology and a potential future of driverless cars. No doubt, Autonomous Drive technology will change how we approach driving. I expect it to result a significant transformation in transportation. But all the talk has left many drivers a bit confused. After years of promoting "eyes on the road, hands on the wheel," the auto industry is now talking about reading your email or a book while you drive – and the prospect of maybe not even needing a driver. So it's a good time to address the questions that arise whenever this subject comes up: Q: What is Autonomous Drive? A: Autonomous Drive combines the technology of robotics, artificial intelligence, sensors and car-to-car connectivity. It is a range of technologies that will be added to our cars over the next several years.