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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.

A car writer's year in new vehicles [w/video]

Christmas is only a week away. The New Year is just around the corner. As 2014 draws to a close, I'm not the only one taking stock of the year that's we're almost shut of. Depending on who you are or what you do, the end of the year can bring to mind tax bills, school semesters or scheduling dental appointments. For me, for the last eight or nine years, at least a small part of this transitory time is occupied with recalling the cars I've driven over the preceding 12 months. Since I started writing about and reviewing cars in 2006, I've done an uneven job of tracking every vehicle I've been in, each year. Last year I made a resolution to be better about it, and the result is a spreadsheet with model names, dates, notes and some basic facts and figures. Armed with this basic data and a yen for year-end stories, I figured it would be interesting to parse the figures and quantify my year in cars in a way I'd never done before. The results are, well, they're a little bizarre, honestly. And I think they'll affect how I approach this gig in 2015. {C} My tally for the year is 68 cars, as of this writing. Before the calendar flips to 2015 it'll be as high as 73. Let me give you a tiny bit of background about how automotive journalists typically get cars to test. There are basically two pools of vehicles I drive on a regular basis: media fleet vehicles and those available on "first drive" programs. The latter group is pretty self-explanatory. Journalists are gathered in one location (sometimes local, sometimes far-flung) with a new model(s), there's usually a day of driving, then we report back to you with our impressions. Media fleet vehicles are different. These are distributed to publications and individual journalists far and wide, and the test period goes from a few days to a week or more. Whereas first drives almost always result in a piece of review content, fleet loans only sometimes do. Other times they serve to give context about brands, segments, technology and the like, to editors and writers. So, adding up the loans I've had out of the press fleet and things I've driven at events, my tally for the year is 68 cars, as of this writing. Before the calendar flips to 2015, it'll be as high as 73. At one of the buff books like Car and Driver or Motor Trend, reviewers might rotate through five cars a week, or more. I know that number sounds high, but as best I can tell, it's pretty average for the full-time professionals in this business.

Mitsubishi and Nissan teaming up on electric kei car

Nissan and Mitsubishi have announced plans to build an electric kei car together. The yet-unnamed car would mark a major step towards electrification of Japan's popular supercompact segment. The car will be powered by a 20 kWh battery and will be engineered to cover daily driving duties in a Japanese driving cycle. The car can also double as a mobile power source or power a home in emergency situations. Nissan says the car will measure 134 inches long, 58 inches wide, and 65 inches tall, in order to comply with laws limiting kei car size. The companies state that the car will be developed by NMKV Co., Ltd., a joint-venture that stands for Nissan Mitsubishi Kei Vehicle. Each carmaker owns a 50 percent stake, and already jointly builds models such as the feline favorite Nissan Dayz, which Mitsubishi sells as the eK. In reality, that likely means Mitsubishi will be developing the car and Nissan will simply slap a badge on it. Nissan has not traditionally built kei cars, choosing instead to rebadge those made by Suzuki or Mitsubishi. In fact, Mitsubishi built the first electric kei car, the i-Miev, way back in 2009, and it was actually sold in the U.S. until 2017. The jellybean-shaped EV was a pioneer in the field, but its 62-mile range from a 16 kWh lithium-ion battery showed the limitations of the technology at the time. Mitsubishi moved about 32,000 of them before they pulled the plug, with a pre-tax-credit price ranging from $23,000 to $31,000. The new Nissan-Mitsubishi kei car will land at around 2 million yen, or $18,200. The price, while slightly more expensive than a gasoline counterpart, bucks predictions from analysts that said prices would skyrocket by 66 to 120 percent if kei cars were forced to electrify. A petrol-powered Nissan Dayz starts at around $15,200. Size-wise, the two share a similar footprint as they are governed by kei car size limits. The special class of cars get unique license plates and other registration cost benefits due to their compact dimensions. A BMW i3 would exceed those boundaries due to its 158-inch length and 70-inch width. However, the larger EV comes equipped with a substantially bigger 42.2 kWh battery good for 152 miles of range. Though no photos have been released, we predict it will look like the iMk concept (pictured above). The car will go on sale in spring 2022. Related Video This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings.