Beginners Guide to Processing 18650 Cells | Cell Database


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South Carolina Powerwall
#11
Soldering station:[Image: 84f0e4f33b6b78cb766674416a07cf43.jpg][Image: 2655e6dcd5f812c3af63762d7bf71d98.jpg]
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#12
(06-27-2017, 08:09 PM)daromer Wrote: 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:


Thank you for the tutorial videos ! Subscribed !
I now understand better what you mean, solder needs to be more of a puddle and less of a ball. I redid the welds, only took 10 minutes or so but saved me hours of headaches later for sure. Thank you dagomer !
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#13
Quick update on my project. I now have 4 x 80P modules (4x20) soldered and tested. No shorts and they have been resting for 5 days now and still show 4.13V (I charged them at 4.14V). Pictures to follow.

In the process of testing I noticed an offset with the 4 Opus chargers i have (of +0.02 V to 0.05V) so they may have been overcharging my cells since they stop at 4.2V but may actually be above that.
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#14
i would say that you are lucky if the opus chargers are within 0.05V Smile Thats pretty good for that price. Mine differ alot more.
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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#15
I did not realize that ! Is there anyway to prevent them from charging to 4.2V (they actually seem to go over in my case by minimum of 0.02V) ?
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#16
no you cannot change that.

And its not that of a big deal i must say. That little 0.02 does not make any significant difference for 1 test.
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
Thabks for the info. At which Voltage does cell damage occur?
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#18
There is no such thing as at xx it is totally damaged. The higher you go the less cycles you get kind of. For normal use the manufacturer have set it to 4.2V.
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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#19
Thank you Daniel. What kind of pack holder do you recommend. I like the ones I see on HBPOWERWALL but I since I'm using the 4x5 plastic cell holders they pack holders need to he either 4 or 5 cell deep. I think they come in 7 deep...
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#20
every discharger I've used has been different some by 100's of mah not so much of a problem if your testing for good v bad cells. How every if your using rePackr to build balanced packs it won't work very well for you.

NB: I've used plumbers solder 50/50 on every one of my cells ..lol
bfleury likes this post
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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