Beginners Guide to Processing 18650 Cells | Cell Database


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Darmok's Power Wall build
#11
I'm putting them in the box marked "hot" for now and not using them. Then may revisit them later.
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#12
Update
I am now looking at 120 or 140 cell packs. Layout 4 x 30 or 4 x 35 per pack. Reason being a BMS like Batrium is a lot less expensive for 1 x string of 14x140 than 2 x strings of 14x80.
They will be quite long which will cause volt drop if I go with the standard size battery buss bar wiring of 2.5mm or 4mm. So Instead I will go with 6mm cable on each pack.

Another idea I'm pondering is making packs extendible. So as you get more cells you can extend the packs. So start with 14 x 80 cell packs then extend those 80 cell packs to 100,120,140....
This obviously won't work with Peters style mounts the way they are designed with fixed ends.


Design ideas under consideration for pack mounts

•Provision for fan mounts on top to draw air up. I'm thinking PC cooling fans 120mm. Could be thermostat controlled. Or BMS controlled.
• Dividing panels between the packs? This could be in cheap, non conductive fire retardant cement panelling.
•Mount provision for a removable ( Perspex ?)front cover to Chanel air flow directly over the packs?
• space on mount system for din rail to mount isolators, protection devices, volt meters or BMS etc.



Re the smell from batteries when getting hot, I've found it can come from the leftover glue if any is on the cell.
Wattsup likes this post
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#13
You can always do 14s80p and then just paralell them. Due to the nature of those types of cells where they follow the voltage pretty good based on the SOC that do work even though its not optimal. You need decent size cables between the packs if doing it.

2.5mm2*6 that I use is more than single 6mm2 Wink

Neither less it sounds like a good plan.
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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#14
Daromer can you explain your bus bar cable sizing I'm unclear on what 2.5mm2*6 is
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#15
6 cores/cables with 2,5mm² diameter, most likely worked together
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#16
Yeap. On my busbar i have 2 sides each with 3 strands of 2.5mm2 twisted solid core copper wire.

https://www.youtube.com/watch?v=hB-7nwQPpco
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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#17
Thanks for that. Nice simple clean design.
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#18
Can you confirm your testing process?
http://www.hbpowerwall.com for a full video diary of my project.... 
https://www.amazon.com/shop/hbpowerwall to buy stuff I use Smile 
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#19
Select batteries that have cells that started life with 2400mAh or greater capacity.
Test Voltage and bin into the following
0-1v
1-2v
2-3v
3-4v
4v+
Cells that are greater than 3v are discharged to 3v. Then the cells are cycled in the Opus @ 500mAh.

The cells that are less than 3v are charged to 4.2v then stored for a minimum of 2 weeks. Then the voltage checked and binned as above and then the Opus procedure undertaken.

My power wall packs are now 140 cells in size. Minimum accepted cell is 2300mAh. They range from 2300 to 3200. I have 15 of them and am currently finalising the balancing of the packs.

I've been practicing building 4s and 6s packs for camping and backyard projects like a system on the chicken coop. With lights and auto poultry door open and closed by an electric car antenna. Charged with a solar panel and controlled by a 12v time clock.

I love Banggood. If you guys haven't heard of it it's a similar thing to ebay. Grab the app or go to the website.
Heatshrink
Anderson plugs
MC4 solar connectors
Crimpers
MPT7210A solar charge controllers
Heaps of arduino gear
Lots of other stuff
jamesk9 likes this post
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#20
Yes, most of us use Banggood. I actually compare prices between eBay and BG. One of the great things about BG is that things come from 'warehouses'. So, if you order a bunch of products from the same warehouse, they pretty much will show up together in the same package. Smile And there are a few US warehouses where you can get some stuff cheaper than eBay.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Dollar Shave Club. Best Razor I've ever used
Certified 18650 Cell Reclamation Technician
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