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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.

Mitsubishi cheated on Japanese fuel economy test since 1991

Mitsubishi now says that its cheating on Japanese fuel economy tests stretches as far back as 1991. The automaker has hired an independent panel of investigators to get to the bottom of what happened, and the company will give them three months to prepare a report about the deception. Mitsubishi's cheat involves how the company calculated driving resistance to determine fuel economy. In 1991, Japan's Road Transport Vehicle Act established a coasting test to establish the driving resistance, but Mitsubishi's engineers used their own "high-speed coasting test," according to its statement. In 2007, the company decided to only use the country's mandated evaluation, but the employees kept utilizing the high-speed test in the field. In the most recent scandal, workers selected low values for driving resistance from the results, which made the fuel economy look better. Mitsubishi's presented these details in a report to the Ministry of Land, Infrastructure, Transport, and Tourism. "We are currently investigating the reasoning behind each of the decisions," the company said in a statement. It also hired three former prosecutors to figure out why this happened for so long. At this time, Mitsubishi only confirms the incorrect figures for some of the company's minicars, but this investigation could discover more transgressions. This fiasco started when Nissan discovered fuel economy discrepancies in some of its Mitsubishi-made tiny kei-class cars in Japan. Mitsubishi came clean and admitted the problem affected about 625,000 vehicles in the country. Japanese media have alleged more vehicles have incorrect mileage, including the Outlander. The National Highway Traffic Safety Administration in the US has also requested data from the Japanese automaker to confirm similar deceptions didn't happen for vehicles here. Related Video: Regarding the Report to MLIT Concerning Improper Conduct in Fuel Consumption Testing of Vehicles Manufactured by Mitsubishi Motors Corporation Tokyo, April 26, 2016 The following is a summary of the report submitted by Mitsubishi Motors Corporation (MMC) to the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) today, pursuant to instructions received from MLIT on April 20 to investigate improper conduct in fuel consumption testing of vehicles manufactured by MMC. Report Summary 1.

Nissan, Renault reveal how they'll reshape alliance to cut costs, regain profit

TOKYO — The auto alliance of Nissan and Renault said Wednesday it will be sharing more vehicle parts, technology and models to save costs as the industry struggles to survive the coronavirus pandemic. Alliance Operating Board Chairman Jean-Dominique Senard said the group, which also includes smaller Japanese automaker Mitsubishi, will have each company focusing on geographic regions. “There is no plan for a merger of our companies,” the chairman said. “Our model today is a very distinctive model ... we donÂ’t need a merger to be efficient.” He stressed the alliance needs to adjust to the “unprecedented economic crisis,” to pursue efficiency and competitiveness, not sheer sales volumes. “Now is the time to rebuild,” Senard said, making clear he believed the alliance remained strong. All automakers are suffering from the pandemic, and scaling back or suspending production, but Nissan was reeling before the crisis struck from a scandal involving its former chairman, Carlos Ghosn. Yokohama-based Nissan is due to report its annual results on Thursday and has forecast it will slip into its first yearly loss in 11 years. Under the latest so-called leader-follower initiative, Nissan will focus on China, North America and Japan; Renault on Europe, Russia and South America and North Africa, and Mitsubishi on Southeast Asia and Oceania, for the benefit of the entire alliance. Nissan Chief Executive Makoto Uchida said the alliance planned to pursue fiscal strength together. “The synergy is huge,” he said. The number of vehicles sharing the same platform will double by 2024, saving 2 billion euros ($2.2 billion), according to Senard. The shared technology will also include electric cars and autonomous driving, platforms and car bodies, the executives said. Nissan is a leader in electric cars with its Leaf, but such technology will be available to the other alliance members, they said. The companies gave few details of how the revamp would deliver in the short term, as the car industry grapples with the fallout from the coronavirus pandemic and pressure to develop less polluting vehicles. They said in a joint statement that they aimed to produce nearly half of their vehicles under the new leader-follower approach by 2025 and hoped to cut investment per model in the scheme by up to 40%. The range of vehicles they produce is expected to fall by 20% by 2025 though the firms did not say how many jobs would go as they shift production.