Beginners Guide to Processing 18650 Cells | Cell Database


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Frank's DIY Powerwall
#1
Hi all,

   just beginning here in Germany, near Cologne  Big Grin



Frank Prumbaum
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#2
(05-28-2017, 05:36 PM)fprumbau Wrote: Hi all,

   just beginning here in Germany, near Cologne  Big Grin



Frank Prumbaum

Lot of success - viel Erfolg!

BigBen
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#3
why is there a fan on those cells?^^ are these sanyo´s?
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#4
Note that if cooling is needed when testing you need to have the same cooling on the powerwall Smile You test to find weak points.
Korishan, hbpowerwall, coolfx like 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
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#5
In Germany by now we have temperatures of 25-30°C, it's summer finally(!), so in my room it is now very warm, too. Some of my cells have very low voltage, so I do have to 'start' them using some loaded cells. I leave the room often for several hours; some days ago when I got back, a cell was so hot I burned my hand. I do not want to risk a fire and I do not wan't to throw cells away only because there voltage is low. So I opt for the fan, running at a very moderate speed though (12V fan driven by NIMH 6-7V).

@daromer So, if the cell gets really hot (>55°C), I will not add them to the powerwall. If they are somewhat good (i.e. if they keep their voltage), I will save them for laptop/powerbank/flashlight usage. Mostly, though, I'll send them on their final way...
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#6
Still i would say you should not run a fan on them for testing. If you are afraid of fire you need to watch the cells and or have them somewhere else.

As i said you do want to see what happens to the cell in the test and if you have the fan on them you could potentially remove alot of heat without any issues with just a slow moving fan Smile Dont take me wrong on this but its all about safety in the end and the test can be done in controlled way meanwhile the actual use later on you will most likely now monitor in same sense.

If the heating of the cells is a big issue add extra temperature monitoring to it. I did a video on how you can add it easily on the Opus.
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
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#7
(05-28-2017, 05:36 PM)fprumbau Wrote: Hi all,

   just beginning here in Germany, near Cologne  Big Grin



Frank Prumbaum

Hi Frank,

viel Erfolg und Grüße aus Braunschweig Smile. Check out my project here...

Btw, if your cells get hot during testing, reducing the charging rate is a much better idea than using a fan for cooling. The fan doesn't stop a chemical reaction inside, I guess, and if a cell catches fire, the fan will burn, too... In addition, the OPUS charger have a built-in temp sensor and should turn off a cell if it's getting too hot (never tested that, though). I also had some cells that went very hot during charging (with both OPUS charger and TP4056 charging PCB) and after reducing the charge current from 1A to 500mA or lower, they cooled down again.

Have sun!
Oliver

Cells tested: 4238 (overall: 8077 Ah, average: 1906 mAh)
Cells in production: 2240 (overall: 4704 Ah, average: 2100 mAh)
Powerwall config: 7s320p, 672 Ah, 16 kWh
What's left: my current grid consumption

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#8
I'm testing batteries and running the powerwall in a badly insulated room under the roof, it's more than 30°c inside since a few days and no problem, batteries are a bit hotter but nothing too hot to be handled, if it occur I dump the cells.

I revive a lot of 0v or 0.01v cells, most of them are in good conditions, but don't take risk, hot cells are dangerous AND don't hold properly their charge so it's ineffective for storage in addition to the risk. 
Reducing charging current is a better option than cooling like fprumbau said but you want to test the cells at least with a bit more than you final use, that's why you tests stuffs, not just for capacity but for safety and long life of your build too.

Think twice before putting a bad cell in your packs, does it worth the risk to rebuild it in two months because of 2 or 3 bads cells ?
Current setup: 21x 215wc poly, 7.5kWh 7s 18650, PIP 2424msxe.
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#9
OK, I have dropped the cooling fan and remain inside the room to monitor dangerous heating in the
first 10 minutes. I go with 500mA charge instead, cause the load I want  to load on the individual cell 
should not surpass 500mA in loading / discharging. 

The way I placed the chargers will not allow a dangerous fire to develop. 

But for now I have a question, what do I have to do to have myself
'certified' :-) , earning this nice star? I  post updates every day or so.

I plan on a powerwall of about 50kWh or more, so I will not start building it some months or so.

I plan to replace my Computer-UPS in another project 
with a self build ( as of now thinking of bying a ClaytonPower G3 2324, so a 24V system) and
using all my not-so-good-cells ( <1800 mAh). Any thoughts / suggestions about this?
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#10
The star as in the count cell list? The star is when you have a verified running wall.

Cologne? Close to The Post Apocalyptic Inventor on Youtube? Smile
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
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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