Beginners Guide to Processing 18650 Cells | Cell Database


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South Carolina Powerwall
#1
Hi Y'all (some say All Y'all for plural)

I have been tinkering with alt-energy for the last decade. Did my own biodiesel, installed PV system for my golf cart, then my RV (660W/208Ah 12V system). I want the house to be off grid one day.

In 2012 we leased a LEAF for 2 years and since we returned it, been looking at a Tesla. I would like to be able to recharge it with solar.

This year I caught wing of Pete's project and bought me about 1k x 18650 cells from eBay recycled laptop batteries.
I have been harvesting, testing, sorting for the last 2 months.

The next project is the following:
I have a cabin which is off grid but running off a genset for the last 3 years. Looking to equip the cabin with PV panels and a powerwall before moving on to the House.[Image: 719ba12310df0896b41b3cf2378e048d.jpg][Image: 1342f4498223438377222b34dc5003e6.jpg][Image: 49c83fe8eb29b7c83949b5de5426b088.jpg][Image: 1aae55fcd15eb3bc314c8e3ee9cef213.jpg]
hbpowerwall likes this post
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#2
Glad you found us Smile I would love a cabin in the wooods, on a hill, with no kids, Kickass internet & unlimited hot water - be bliss lol
Affiliated links below support forum & YouTube projects.
One click on any (or all) and I'll typically make 4% of the
value of the sale without costing you anything but a mouse click. 
Thanks for your support ! 
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#3
Before starting with the large battery built, I have decided to train myself using about 180 cells < 2200 mAh that I was not planning on using anyway. I took 160 of these to attempt to make a 71Ah 14.8V (1777mAh average) battery for my RV.
After testing and charging/discharging them, I compiled each cells capacity in an XL file.

By using some basic maths each of the arrays is pretty capacity balanced to each other. [emoji41] [Image: 06a5d0bda1a452da5b4efde9eeb7afad.jpg][Image: 22464f100e798df1b0b6e701af019c45.jpg]
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#4
Nice test bank.
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#5
(06-27-2017, 04:24 PM)jdeadman Wrote: Nice test bank.
Thanks ! Next step is to Flux and add solder to the cell terminals.

Is Rosin core solder ok to use?[Image: af84522173d2d8049bd5ed6a6462439e.jpg]
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#6
Yes just dont use pluming flux
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#7
All solder'd up, both sides. Now buss bars [Image: a5243fb78ae1c42c1adbaf3ac683f616.jpg][Image: 458961bd99a2349dee01cdb190429dd9.jpg][Image: dcb9f46bd5e0a91b01c2d32bad1357e9.jpg]
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#8
I dont want to ruin anything but you need to resolder those cells. They need to flow out better. The soldering station you have seem to have very little mass on that tip/iron. And perhaps to low power too. They should flow out a bit better.

Look at my video i did and at 7 minutes in and you see how it should look.




Because your joints look like cold joints and adding fuse wire on those can cause contact issues and heat or just no contact at all.
bfleury likes this post
Follow me! >> YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcomming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#9
(06-27-2017, 07:29 PM)daromer Wrote: I dont want to ruin anything but you need to resolder those cells. They need to flow out better. The soldering station you have seem to have very little mass on that tip/iron. And perhaps to low power too. They should flow out a bit better.

Look at my video i did and at 7 minutes in and you see how it should look.




Because your joints look like cold joints and adding fuse wire on those can cause contact issues and heat or just no contact at all.
Will do ! Thanks daromer. The reason I put this here is for exactly this kind of feedback. Better now than having to take everything appart. Soldering station goes up to 480F, how hot do you solder? (Maybe the answer is in the video!)
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#10
Good that you take it right Smile We are all here to learn.

The heat of the soldering iron as such is not the big thing. Ie F/C. As long as it can melt the solder thats hot enough.
Its about having enough mass/energy so you can heat up the object so the solder actually flows out. When you then add copper busbar you need even more energy/heat.
In general its about picking a soldering iron with alot of mass in the tip and also in the rest of it. Atleast 50W but i generally state that 75-100 or even 150w is better. We do not want to heat the cells more than needed and to do that it need to go fast.


Regarding soldering irons I also made this video earlier:


bfleury likes this post
Follow me! >> YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcomming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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