goldbrick
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Leaf Number: 311806
Location: Boulder, CO

Re: Timecapsule 2015, dodgy battery troubleshooting

Mon Nov 05, 2018 11:43 am

Impressive work Dala. Hope this fixes those cells and that they stay healthy for a long time.

Dala
Posts: 98
Joined: Sun Oct 28, 2018 11:24 am
Delivery Date: 01 Jan 2015
Leaf Number: 316851

Re: Timecapsule 2015, dodgy battery troubleshooting

Tue Nov 06, 2018 1:33 am

After charging the cell up and letting it sit for 16h, it unfortunately drooped back a few mV, indicating high internal resistance. It will have to be replaced in the future, but the car should be usable now, so I spritzed some bathroom silicone around the battery, and popped it back in to the car.

I then plugged the charger back in, and tadaa, the blue dash charge leds lit up! :D
Image

The leafspy now reports a 46mV diff, heck of a lot less than 150-225 range before!
Image

The GOM happily reports a total 177km range now, but I need to just drive it and see what the actual range is.
Image

I took it for a test drive, and got 35km with loosing only two bars. That trip would have been impossible pre-surgery!

Now I will start the process to try and get my hands on a good low-mileage Gen2 cell from another 24kWh leaf...

LeftieBiker
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Re: Timecapsule 2015, dodgy battery troubleshooting

Tue Nov 06, 2018 2:48 am

Great work! You turned a write-off of a Leaf into an average driver. I hope the cells have found their 'natural balance' for their condition, and stay there.
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powersurge
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Re: Timecapsule 2015, dodgy battery troubleshooting

Tue Nov 06, 2018 7:39 am

Amazing work... Nice to see a forum member that can really attack this car...

COULD I ASK YOU FOR AN AMAZING FAVOR THAT CAN BENEFIT ALL OF US MECHANICAL TYPES?

PLEASE WRITE A LIST OF THE PROCEDURE OF HOW YOU TOOK OUT THE BATTERY....

I would love, down the road to try replacing a battery on my own....

Lothsahn
Posts: 433
Joined: Thu Apr 05, 2018 4:35 pm
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Leaf Number: 007797

Re: Timecapsule 2015, dodgy battery troubleshooting

Tue Nov 06, 2018 8:14 am

Since you know they're bad, you may wish to replace the two cells as soon as possible. If you wait too long, the BMS may remove a health bar, making yours an 11 bar car. Unless you know how to do a BMS reset, you'll be stuck with an <12 bar car with a good battery. :)
2011 Silver SV, purchased 2018, lives in Missouri (previously in CA)
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Battery swap 2019/04/24 (87% SOH, 12 bar)

goldbrick
Posts: 571
Joined: Tue Aug 01, 2017 3:33 pm
Delivery Date: 01 Aug 2017
Leaf Number: 311806
Location: Boulder, CO

Re: Timecapsule 2015, dodgy battery troubleshooting

Tue Nov 06, 2018 10:08 am

Dala wrote:After charging the cell up and letting it sit for 16h, it unfortunately drooped back a few mV, indicating high internal resistance.
Could you explain why the voltage droop indicates high internal resistance? Is this due to the re-balancing going on or is this just how Li cells degrade or am I just missing it?

And once again, very nice work and thanks for sharing!

DaveinOlyWA
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Leaf Number: 314199
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Contact: Website

Re: Timecapsule 2015, dodgy battery troubleshooting

Tue Nov 06, 2018 1:07 pm

Great way to stave off reality for what I think will be a few weeks at the most. Balancing happens all the time and every second, those two cells will fall farther and farther behind. I would replace them ASAP if not sooner.
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 deceased. 29,413 miles. 2018 S40; 15,000 miles, 478 GIDs, 37.0 kwh 109.81 Ahr , SOH 94.61, Hx 120.15
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WetEV
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Re: Timecapsule 2015, dodgy battery troubleshooting

Tue Nov 06, 2018 3:12 pm

I worry that the real problem is a bad BMS. For some reason, perhaps the BMS is always discharging these cells.
WetEV
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ElectricEddy
Posts: 501
Joined: Tue Feb 25, 2014 1:42 pm
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Leaf Number: 313506
Location: Nanaimo, B.C.

Re: Timecapsule 2015, dodgy battery troubleshooting

Tue Nov 06, 2018 4:24 pm

WetEV wrote:I worry that the real problem is a bad BMS. For some reason, perhaps the BMS is always discharging these cells.
Should be able to swap leads with other cells (obviously tag them first) to verify.
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mfd date 09/16

Dala
Posts: 98
Joined: Sun Oct 28, 2018 11:24 am
Delivery Date: 01 Jan 2015
Leaf Number: 316851

Re: Timecapsule 2015, dodgy battery troubleshooting

Wed Nov 07, 2018 1:21 am

powersurge wrote:Amazing work... Nice to see a forum member that can really attack this car...

COULD I ASK YOU FOR AN AMAZING FAVOR THAT CAN BENEFIT ALL OF US MECHANICAL TYPES?

PLEASE WRITE A LIST OF THE PROCEDURE OF HOW YOU TOOK OUT THE BATTERY....

I would love, down the road to try replacing a battery on my own....
I watched two youtube videos before attempting this, they showed this much more in detail. Just google Nissan Leaf Battery Removal, they are gold!
Lothsahn wrote:Since you know they're bad, you may wish to replace the two cells as soon as possible. If you wait too long, the BMS may remove a health bar, making yours an 11 bar car. Unless you know how to do a BMS reset, you'll be stuck with an <12 bar car with a good battery. :)
Noted, It is strange how this hasn't already happened, the previous owner seems to have put 700km on it in this shitty state somehow! Replacing is still top prio!
goldbrick wrote: Could you explain why the voltage droop indicates high internal resistance? Is this due to the re-balancing going on or is this just how Li cells degrade or am I just missing it?

And once again, very nice work and thanks for sharing!
Ofcourse! I've done tons of Lithium 18650 battery salvaging in the past, and that involves running them thru a capacity check. When dealing with lithium of unknown quality, the first step is to charge it up and let it sit at maximum voltage for a day or two. If any significant vdroop occurs, internal resistance due to microscopic cracks inside is usually the reason, and the cell needs to be recycled.
DaveinOlyWA wrote:Great way to stave off reality for what I think will be a few weeks at the most. Balancing happens all the time and every second, those two cells will fall farther and farther behind. I would replace them ASAP if not sooner.
Yeah I know, I just need this for a daily driver while I wait for a cell :)
WetEV wrote:I worry that the real problem is a bad BMS. For some reason, perhaps the BMS is always discharging these cells.
Yeah as ElectricEddy also said, when I do the actual replacement, After replacing the cell, I intend to also swap the 57&58 with say 59&60 to get a baseline of the BSM state.

Thanks to all involved, this forum is great!

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