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Dala's Leaf buildthread (2015 Nissan Leaf)
#11
Very good  Smile

I'm off to collect a pair of complete 30kWh packs next week.
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#12
Cool!

So I finished the bottom balancing. Here are the results

I was hoping to get a peek of the model number for the shitty replaced cell, but unfortunately it is below the visible sheet metal.


Here is the car, fully charged. Note that it only goes to 83% SOC, limited by the shitty degraded cell that hits 4.1V before the rest.


After driving it for 15km.


After driving it for 30km


Noticed that the fully charged GOM now says 140km instead of 180km. The bars are also lost quicker up top now (expected!) but should now be a bit more stable at lower SOC.

This concludes manual balancing. Now the next step is to actually replace the module. The bottom balancing will probably squeeze out a few more km's, might even be able to hit >100km now, but cell replacement is inevitable.
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#13
Personally I'd pull that cell and replace it when it comes in. No amount of Balancing will cure low capacity on a cell.
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#14
That pack has had a short, easy life - do you have access to a rapid (50kW) ?
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#15
(11-21-2018, 08:48 PM)jdeadman Wrote: Personally I'd pull that cell and replace it when it comes in. No amount of Balancing will cure low capacity on a cell.

Ofcourse! This is just the extra legwork I decided to do, when the time comes to put in a new cell, I can just deplete the battery (thanks to my bottom balancing efforts) and slap in a new cell at <5% SOC. The extra time spent here helps further down the line.

(11-21-2018, 09:44 PM)Sean Wrote: That pack has had a short, easy life - do you have access to a rapid (50kW) ?

Loads of them floating around here, 3x CHAdeMO within 5km range of my flat! But I tend to stick to the free L1 chargers, might aswell save that 1€ on each charge lol Tongue
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#16
I just went 80km on a charge with heat on, then the low battery warning popped up. But all is not doom and gloom, I got my hands on a cell!



It came from Italy, a company that specializes in conversions and home-brew scooter solutions. It was cheap, and SUPPOSEDLY low mileage.

Part number: 295B9-3NF0B QR 14520 07486

Before I just chuck this one in, it might be wise to capacity test it. Wouldn't be fun at all to put in the hours and end up with similar range.

Specs seem to point towards 0.3C discharge rate, so that's what I'll aim for. Only problem is, I only have 18650 capacity testers that are made for max 10AH batteries... Might be time to invest in some better testing equipment.
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