yontyont
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New device boosts road time for Leaf by 50%

Fri Nov 24, 2017 7:20 pm

Battery-switching device promises more road time for Leaf drivers.
Nissan Leafs, which go about 107 miles on a charge, sometimes end up relegated to commuter cars due to battery-life worries.

They could work about 50 percent longer with a device provisionally patented by Vanderbilt University’s Ken Pence, professor of the practice of engineering management, and Tim Potteiger, a Ph.D. student in electrical engineering. It reconfigures modules in electric car battery packs to be online or offline—depending on whether they’re going to pull down the other modules.


“We know there are some battery cells that run out of juice earlier than others, and when they do, the others run less efficiently,” Potteiger said. “We make sure they all run out of energy at the same time, and there’s none left over.” That means they commonly show empty with 10 percent or more power left, Potteiger said. Their device also can connect to electric cars’ software for a more accurate read that allows drivers to get the most out of a charge.

https://news.vanderbilt.edu/2017/11/20/ ... esla-leaf/

LeftieBiker
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Re: New device boosts road time for Leaf by 50%

Fri Nov 24, 2017 7:27 pm

So 9% more power available equals 50% more "road time." Great.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

cwerdna
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Re: New device boosts road time for Leaf by 50%

Fri Nov 24, 2017 7:38 pm

Why the dupe post?

OP already posted the same link at viewtopic.php?f=17&t=24951.

Mod Note: Deleted other thread.

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jjeff
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Re: New device boosts road time for Leaf by 50%

Sat Nov 25, 2017 8:26 am

LeftieBiker wrote:So 9% more power available equals 50% more "road time." Great.

My thought exactly, must be that new math :lol:
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2013 S w/QC purchased new
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TomT
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Re: New device boosts road time for Leaf by 50%

Sat Nov 25, 2017 9:30 am

Go 25% slower... That will accomplish the same thing for free! :)
59,991 miles/12 bars/289 Gids/68.54 AHr/101% SOH/101.64% Hx 7May15 w/ new Lizard (barely made the warranty).
71,770 miles/12 bars/256 Gids/59.04 AHr/88% SOH/87.92% Hx 3Mar16 at lease return.

Now driving a 2016 Volt Premier. Model 3 configured.

yontyont
Posts: 4
Joined: Fri Mar 11, 2016 11:15 am
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Leaf Number: 321622

Re: New device boosts road time for Leaf by 50%

Sat Nov 25, 2017 6:35 pm

More details for ignorant:
Nissan Leafs, which go about 107 miles on a charge, sometimes end up relegated to commuter cars due to battery-range worries. The mass-market, standard Tesla Model 3 can go double that but still can be disconcerting on long road trips.

Both batteries could work up to 50 percent longer with a device provisionally patented by Vanderbilt University's Ken Pence, professor of the practice of engineering management, and Tim Potteiger, a Ph.D. student in electrical engineering. It reconfigures modules -- clusters of battery cells -- in electric cars to be online or offline depending on whether they're going to pull down the other modules.

The two used the open-source Tesla high-density, lithium-ion battery to model their method of improving durability and increasing range, adding a controller to each of the battery's cells.

"We know there are some battery cells that run out of juice earlier than others, and when they do, the others run less efficiently," Potteiger said. "We make sure they all run out of energy at the same time, and there's none left over."

With both the Tesla and Nissan battery packs' current configuration, gauges give a worst-case scenario on the amount of power left so that users don't get stranded. That means they commonly show empty with 10 percent or more power left, Potteiger said. Their device also can connect to electric cars' software for a more accurate read that allows drivers to get the most range out of a charge.

The older the batteries are, the more likely they are to experience problems making them less efficient, and the more useful the team's device becomes, Pence said. "They'll have a longer useful service life," Pence said. "Drivers won't see the 50 percent return immediately, but they will later on in the life of the battery."

Instead, the duo ended up with the battery switcher and are working with the Vanderbilt Center for Technology Transfer and Commercialization to get it to market.

LeftieBiker
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Re: New device boosts road time for Leaf by 50%

Sat Nov 25, 2017 7:28 pm

At what point do the weak cells reduce overall pack output by 50%? Is the topic title perhaps a little bit misleading...?
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

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Nubo
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Re: New device boosts road time for Leaf by 50%

Sat Nov 25, 2017 8:21 pm

I can’t put into words how less ignorant I now feel.
I noticed you're still working with polymers.

Rxleaf
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Joined: Wed Aug 10, 2016 6:33 pm
Delivery Date: 11 Aug 2016

Re: New device boosts road time for Leaf by 50%

Sat Nov 25, 2017 11:47 pm

Only thing I can think of is that perhaps all that shunting of electricity between the cells causes excessive degradation of the battery. If you avoid the shunting, you avoid increased battery degradation.

But that's just a SWAG.

Any battery engineers out there?

https://news.vanderbilt.edu/2017/11/20/ ... esla-leaf/

2k1Toaster
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Joined: Mon Nov 18, 2013 5:45 pm
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Leaf Number: 420903

Re: New device boosts road time for Leaf by 50%

Sun Nov 26, 2017 12:33 am

The 50% numbers aren't for a new Leaf. The posts that say they 100% charge and then only get 15-20 miles range because they have a bad cell, this would increase their range. When a module is dead, it basically switches it out connecting the module before the dead cell to the module after. If you have battery modules A-B-C and B is bad, it would switch it out so that B is floating and A connects to C directly. Lowering the pack voltage but keeping the car from shutting down to the lowest cell in the pack. And it just keeps doing that until there is not enough series voltage.

That's what I gather from reading the page. I could see in an extreme case of a single very bad cell in the pack of otherwise good cells, you could approach the 50% number.
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