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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 teases new pickup on Twitter [w/video]

Nissan is celebrating 80 years of building pickup trucks by teasing its latest one on Twitter ahead of a June 11 reveal. Official information about the new vehicle is essentially nonexistent at the moment, but there are some clues to extrapolate from.
There's a special member of the #Nissan family on the way. Due date: June 11th. pic.twitter.com/OkQ0GkXypV

- Nissan (@Nissan) June 2, 2014

Carlos Ghosn appears in court: 'I am wrongly accused'

TOKYO — Former Nissan Chairman Carlos Ghosn told a Tokyo court on Tuesday that he was innocent, defending his honor in his first public appearance since he was arrested on Nov. 19 and charged with false financial reporting. "Your honor, I am innocent of the accusations against me," Ghosn told the judge, speaking firmly and calmly as he read from a statement. "I am wrongfully accused." Prosecutors have charged Ghosn, who led a dramatic turnaround at the Japanese automaker over the past two decades, with falsifying financial reports in underreporting his income by about 5 billion yen ($44 million) over five years through 2015. They also say he is suspected of having Nissan temporarily take on his investment losses from the financial crisis. Seen for the first time since his November arrest, Ghosn was wearing a dark suit without a tie, and plastic slippers, and looked thinner and with gray hair. He rebutted the allegations against him point-by-point and said he had the option to leave Nissan but had decided to stay on. "A captain doesn't jump ship during a storm," he told the court in a strong voice. The veteran auto executive, a familiar face at the World Economic Forum and other elite gatherings, was handcuffed and led into the courtroom with a rope around his waist as the hearing began. Officers uncuffed him and seated him on a bench. Presiding judge Yuichi Tada then read out the charges and said Ghosn, a Brazilian-born Frenchman of Lebanese ancestry, was considered a flight risk — he was arrested on his arrival in Tokyo by private jet — and might try to hide evidence. In Japan, suspects are routinely held without bail, often due to fears about evidence tampering. During Tuesday's hearing, Go Kondo, one of Ghosn's lawyers, argued he was not a flight risk. "He's widely known so it's difficult for him to escape. There is no risk that the suspect will destroy evidence," he said. Facing the courtroom, Ghosn spoke proudly of the automaker's — and his own — achievements, such as reviving iconic models like the GT-R and the Z, expanding operations in China, Russia, Brazil and India and pioneering electric cars and autonomous driving. "I have a genuine love and appreciation for Nissan," he said. Ghosn has been held in spartan conditions at a Tokyo detention facility since he was taken into custody. In keeping with Japanese regulations, he has been allowed visits only from his lawyers and consular officials.