backtop


Print 85 comment(s) - last by EricMartello.. on Jul 26 at 8:47 PM

The problem is likely Nissan's air cooling system used for the Leaf's battery

The Nissan Leaf is a top player in the electric vehicle (EV) industry, but one major issue that sometimes plagues these vehicles is the battery -- and the Leaf's battey seems to be taking a lot of heat.

Leaf owners in Arizona have recently complained that their EVs are losing significant capacity in the desert's hot heat. In fact, Arizona Leaf drivers Scott Yarosh and Mason Convey have both testified to this claim.

"When I first purchased the vehicle, I could drive to and from work on a single charge, approximately 90 miles round trip," said Yarosh. "[Now] I can drive approximately 44 miles on this without having to stop and charge."

Both owners said they've lost about 30 percent of their battery capacity since purchasing their vehicles. Even when their batteries are fully charged, two to three of the 12 lights on their battery capacity gauge are out.

Both owners are very meticulous about how they care for their Leafs. There is absolutely no sign of abuse, as both were able to produce dealership service records with high marks.

"We want to learn more about what's going on, but it's something we've just been made aware of, and we don't have any conclusions yet," said Perry.

The problem is likely Nissan's air cooling system used for the Leaf's battery. Tesla CEO Elon Musk even predicted that Nissan's cooling system would fail the Leaf at some point back in August of 2010.


Musk said that Nissan's Leaf employed a cheaper air cooling system that would make its battery temperatures jump "all over the place," where cold temperatures would degrade the battery while hot temperatures would shut it down. Tesla, on the other hand, uses a high-end liquid heating/cooling thermal management solution.

But for those who are still avid Leaf fans, there's great news if you live in California or Washington. Dealerships in these two states are cutting about $5,000 off the price tag for a new 2012 Nissan Leaf. The MSRP is usually $37,250, but with the $7,500 federal tax credit, the $2,500 California clean-vehicle purchase rebate, and now the additional $5,000 off, the price for a brand-new 2012 Leaf is only about $23,000.

Sources: CBS 5, Green Car Reports



Comments     Threshold


This article is over a month old, voting and posting comments is disabled

RE: One Day They'll Get it Right...
By toffty on 7/19/2012 3:32:31 PM , Rating: 1
No contradiction at all.

How 'bout in Alaska. Gas cars don't start all the time in the winter when the oil in the engine freezes. Not the case with electric cars. So ICE vehicles are NOT ready following your logic.


By Pneumothorax on 7/19/2012 5:34:20 PM , Rating: 2
quote:
by toffty on July 19, 2012 at 3:32 PM

No contradiction at all.

How 'bout in Alaska. Gas cars don't start all the time in the winter when the oil in the engine freezes. Not the case with electric cars . So ICE vehicles are NOT ready following your logic.


Battery total capacity goes to hell in the cold lol.

Most of the smart people up there have engine block heaters or heated garages so no cracked blocks or sludged oil. Advantage of ICE is just as long you don't take too long at your destination, your engine will stay warm for quite some time, or better yet you can keep it running WITH THE HEAT ON. Try driving a leaf at sub zero weather with the heater on and we'll see how many of the 100 miles you'll get.


RE: One Day They'll Get it Right...
By Spuke on 7/19/2012 6:12:22 PM , Rating: 2
Yeah, how bout in Alaska where EV's range to severely reduced to being almost non-functioning. Sure you can start them but they can't go anywhere. BTW, not just oil freezes and there's these things called block heaters that keep gas cars fluids warm. You do know that people in cold climates have been driving gas cars for decades, right? That problem has already been solved. Has anyone solved the reduction of capacity of batteries? Didn't think so. Not ready for prime time and, YES, you DID contradict yourself.


RE: One Day They'll Get it Right...
By mcnabney on 7/20/2012 9:56:39 AM , Rating: 2
Modern EV batteries have sophisticated temperature controls when NOT running, so cold isn't an issue.


By Dr of crap on 7/20/2012 10:19:48 AM , Rating: 2
So when it's -30°F the sophistcated system that keeps the battery warm is powered by ------??
Yep that's right it powered by itself, again reducing the range that it can get in extreme cold!


RE: One Day They'll Get it Right...
By Alexvrb on 7/20/2012 1:32:06 AM , Rating: 2
Engine oil doesn't freeze at Alaskan temps, but it does get thicker. They don't use parrafin wax in motor oils anymore, modern oils are really outstanding. Besides, if you live in a cold climate, you're going to be using something like fully synthetic 0w oil (such as 0w20, 0w30, 0w40 depending on desired viscosity once at operating temp). This makes for much easier starts in cold climates, combined with a strong battery and good starter motor.

Modern gasoline engines do just fine, really. Don't even usually need a block heater for a gas motor, unless you're impatient and don't want to let it idle for a bit. Diesels have a bit more of an issue, because the fuel itself can gel/crystalize. But properly blended winter diesel fuel is pretty good, and if it isn't sufficient there are additives/treatments, and there's always heaters.

But if you think that's bad... you have no idea how crappy the performance of the battery pack in the Leaf would be in really cold temperatures. Others have already pointed that out though. Even better EVs and Hybrids with superior battery cooling/heating systems would still have to waste some power regulating the battery temp (in this case, heating it and keeping it warm). So it's not all roses for EVs, either.


By Bad-Karma on 7/20/2012 3:21:43 AM , Rating: 2
Back in the early 90s' we took our EC-130Hs up to Eielson AFB to teach our crews and maintenance guys how to keep the birds flying under extreme cold weather conditions. At the time it was well below -30F with the windchill.

Always remember seeing a maintenance guy stationed there striking this black rod about 3" round and a couple off feet long on the pavement. Little chips would break off and he'd gather them up in an old coffee can. Then he places it over on the exhaust manifold of a Aircraft start cart. We asked him what he was doing and was floored when he replied; "Thawing out some axle grease!"

Later on they even demonstrated how a heavy piece of steel became brittle from the cold. Guy struck it with a mallet and the thing fractured almost like glass.

I know this isn't quite on the tread subject but just wanted to add to your post that there are a lot of other factors to keep machinery running in the extreme environments. But even down here in the lower 48 weather can get down below -50F in places like Yellowstone.


"If you can find a PS3 anywhere in North America that's been on shelves for more than five minutes, I'll give you 1,200 bucks for it." -- SCEA President Jack Tretton














botimage
Copyright 2014 DailyTech LLC. - RSS Feed | Advertise | About Us | Ethics | FAQ | Terms, Conditions & Privacy Information | Kristopher Kubicki