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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 not shuttering Leaf EV battery plants, at least not yet

The big news on the electric vehicle front today is that Nissan is considering slowing down EV battery production in the US and UK and source all of Nissan's big packs come from Japan. Nissan may also buy some batteries from the Korean company LG Chem. This is apparently causing dissent within Nissan, but it follows what Alliance partner Renault is doing in the hunt for 180-mile EVs. This change – officially denied by Nissan – raises a lot of questions here, since Nissan made a huge deal about building the Leaf pack in Tennessee a few years ago. In fact, the car's big price drop was due, in part, to localizing battery production. If the company is really going to give up on building the packs where it makes the cars, then does Nissan not see itself as being capable of producing an energy-dense battery cheap enough to compete with Tesla and its Gigafactory and GM (which, of course, has long worked with LG Chem on batteries)? Whatever Nissan decides, it needs to be ready to compete in a market that offers a $35,000, 200-mile car by 2017. "We have not taken any decision whatsoever to modify battery sourcing allocation." – Renault-Nissan's Rachel Konrad Nissan would not comment directly on the reported change, but Rachel Konrad, the Alliance's global director of communications and marketing told AutoblogGreen, "The Renault-Nissan Alliance remains 100 percent committed to its industry-leading EV program. This global commitment continues for the foreseeable future, and we have not taken any decision whatsoever to modify battery sourcing allocation. Nissan has no plans to impair its battery investments. Beyond that,we will not comment on speculation or anonymous sources, and as a matter of policy the Alliance does not confirm or deny procurement reviews." There's a point-of-view where it doesn't matter where the batteries come from if the resulting EV is competitive, price-wise. Renault CEO Carlos Ghosn, after all, said during a recent Twizy test drive that the battery is a means, and the objective is the car. In the end, Nissan is saying it has no near-term or medium-term plan to shutter plants in US or UK and CEO Carlos Ghosn says, "What's important to us is that electric car performance fully meets customer expectations." Whatever's going on, Ghosn has seen three top executives leave the Renault-Nissan family recently.

Renault and Nissan forge deeper alliance

If the automotive industry's current era could be summarized by one trend - from a corporate aspect, anyway - surely it would be conglomeration. But of all the major auto groups that have emerged over the past several years, none have kept themselves at arm's length quite like the Renault-Nissan Alliance.
Much like Fiat and Chrysler, Renault and Nissan are presided over by a common chief executive. But whereas Sergio Marchionne's Italian-American alliance has moved swiftly from a transatlantic partnership to a merged company in the span of less than five years, Carlos Ghosn's Franco-Japanese alliance has stood oceans apart since 1999. But now the Renault-Nissan Alliance is following the lead set by Fiat Chrysler Automobiles in bridging that distance through several key measures.
For one, Renault and Nissan will make increased use of common platforms, R&D, systems and testing. The two automakers will also cooperate more closely on manufacturing and supply chain management, purchasing and human resources. To manage the increased cooperation, the alliance has appointed several new executive vice presidents from within its ow ranks and a new management committee to be chaired by Ghosn, details about which you can read in the press release below.