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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.

Recharge Wrap-up: Tesla Model S in landslide, Plug'n Drive wants EVs

A woman and child survived a landslide in a Tesla Model S. The front of the car was severely damaged with the hood and front fascia badly crumpled. The rear hatch window glass caved in, but while the windshield was cracked, the safety glass held together. While in another vehicle, the occupants could have been crushed by the tree that landed on the car, the cabin structure of the Model S mostly withstood the pressure, saving the humans inside. It's not the typical situation most people think of when considering car safety, but it is a dramatic example of the protection the Model S offers. Read more and see the aftermath at Green Car Reports. The Renault-Nissan Alliance will provide 200 battery electric vehicles for the United Nation's COP21 climate conference in Paris. Together the cars will drive a combined 400,000 kilometers (about 248,550 miles) emissions-free. The cars - a fleet of Renault Zoes, Nissan Leafs and Nissan e-NV200s - will be used as shuttles for the conference attendees. The Alliance will set up a network of 90 chargers for the event, powered by low-carbon electricity. The residual emissions will be offset through a UN carbon offsetting program. Read more from Nissan, or at Green Car Congress. At the Queen's Park Electric Vehicle Day this week, the non-profit group Plug'n Drive called for Ontario to emphasize vehicle electrification. The group says that adding electric power to more cars, "can make a significant contribution to GHG emission reductions in Ontario, while at the same time benefitting the Ontario economy." GHG are, of course, greenhouse gases. According to the group, there are currently more than 12,140 EVs in Canada. Read more in the press release below. Plug'n Drive advocates for electrification of transportation as a key plank of Ontario's climate change action strategy First ever Electric Vehicle Day at Queen's Park demonstrates the benefits of electric vehicles TORONTO, ON, Oct. 26, 2015 /CNW/ - Plug'n Drive is hosting the first ever Queen's Park Electric Vehicle Day today at 11:00 a.m., providing MPPs from all parties, Ministers, public servants, stakeholders and the public the opportunity to test drive electric cars at all price points and to learn about the environmental and economic benefits of switching from gas to electric.

Nissan recalling more than 1M vehicles for airbags that may fail to deploy

Nissan and the National Highway Traffic Safety Administration have issued a recall for 989,701 vehicles in the US due to an issue with their passenger-side airbag systems. Affected Nissan models include the Altima, Leaf, Pathfinder and Sentra from the 2013 and 2014 model years, and 2013 NV200 taxis. Affected Infiniti models include the 2013 JX35 and 2014 Q50 and QX60 utility vehicles.
Reuters is reporting that a total of 1,053,479 vehicles are included in the recall globally, with about 60,000 of the affected vehicles having been sold in Canada.
The fault apparently lies in something called the occupant classification system, which may, in the recalled vehicles, incorrectly classify the passenger seat as empty when it is in fact occupied by an adult. When the system fails to recognize the passenger, the passenger-side airbag may deactivate, and could therefore fail to deploy in the event of a crash.