http://green.autoblog.com/2014/03/17/dc-fast-charging-not-as-damaging-to-ev-batteries-as-expected/ DC fast charging not as damaging to EV batteries as expected By Sebastian Blanco Mar 17th 2014 Simanaitis Says, INL
[image http://green.autoblog.com/photos/nissan-leaf-dc-fast-charging-test-charts/ Charts of Shirk's presentation show the energy capacity - Nissan Leaf DC fast charging test ] 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 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 ... 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. [© 2014 AOL] ... http://simanaitissays.com/2014/03/16/quick-charge-quick-degradation/ Simanaitis Says ... http://green.autoblog.com/avt.inel.gov/pdf/prog_info/SAEHybridSymposium2014.pdf INL For all EVLN posts use: http://electric-vehicle-discussion-list.413529.n4.nabble.com/template/NamlServlet.jtp?macro=search_page&node=413529&query=evln&sort=date Here are today's archive-only EV posts: EVLN: Australian evracesystems.com e-racer 0-200kph:8s EVLN: Plug in, Turn on, Drive off EVent @EV Rally 5/4 Westport CT EVLN: Cupertino buildings' EVSE prep> ordinance Chap16.58 Title16 EVLN: Competition in Korea's EV market speeds up (video) EVLN: Musk sez 'Why auto dealers are terrified of EVs' + EVLN: Deutsche Post DHL to expand Kangoo-ZE, ZOE, Twizy EV fleet {brucedp.150m.com} -- View this message in context: http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVLN-Pack-degradation-depends-on-miles-not-charging-rate-L3-vs-L2-tp4668581.html Sent from the Electric Vehicle Discussion List mailing list archive at Nabble.com. _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
