Beginners Guide to Processing 18650 Cells | Cell Database


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J-Mans project
#1
Greetings everyone,

starting a general thread here like everyone.

Things are moving on well, tested about 600 cells so far :Smile


Im doing a practice run for the soldering and something doesnt seem right. 
If you look at the picture you can see the solder is just a ball sitting on the cell and its like brown around it. its not a flat blob like from other people. The one column, third from the right is a different solder (the small roll) and that one looks better.

I have an 80W soldering iron, reaches about 490°C according to the manual. Too hot?

What am I doing wrong?

cheers


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#2
You dont need 500C.... (But that should not cause that issue you have) A ball like that is either because the flat surface of the cell wasnt heated enough or you had a surface that wasnt clean enough.

You need to go back and hold the soldering tip longer so it flows out. You can most likely remove them with your nails kind of Smile

Im not sure about the first solder you used. It seems weird temperature but it might be me. Someone else will answer about the solder. I use normal 60/40 Lead based solder and it works great. I touch the cell for 1-2 seconds and add solder and it flows straight out.
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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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#3
(05-18-2017, 07:46 PM)daromer Wrote: You dont need 500C....   (But that should not cause that issue you have)  A ball like that is either because the flat surface of the cell wasnt heated enough or you had a surface that wasnt clean enough.

You need to go back and hold the soldering tip longer so it flows out. You can most likely remove them with your nails kind of Smile

Im not sure about the first solder you used. It seems weird temperature but it might be me. Someone else will answer about the solder. I use normal 60/40 Lead based solder and it works great. I touch the cell for 1-2 seconds and add solder and it flows straight out.

Ahh ok, ill try again with heating the surface a bit. 

Naaah, they arent coming off :Big Grin Solid

the lead 60/40 solder seems to have the better results as you can see. The big roll of solder is electronics solder, the guy at the store was saying "yeah thats the one you want, definitely" Never trust the salesman...
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#4
i used both, both can work without a hitch, i prefer 60pb 40sn, because i like lead^^ rohs go to hell
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#5
(05-18-2017, 08:10 PM)MajStealth Wrote: i used both, both can work without a hitch, i prefer 60pb 40sn, because i like lead^^ rohs go to hell

What do you do to make it work? Tongue because it isnt for me...



Yeah ok nevermind, the solderballs came off quite easily with a screwdriver
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#6
As i said you lnly melted the solder on top of the cells Smile if u dont get it to flow even when heating the cells try some sandpaper first
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
Soldering Cells is all about the Size of the TIP. The bigger the tip the easier it is to heat up the surface and not heat the internal part of the cell

I have a Hakko that allows for different tips and I use it for tiny stuff with the 0.5mm tip and Batteries with the 5mm Tip. the Bigger one takes longer to heat up but I can solder a cell within the count of 3
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#8
(05-18-2017, 09:45 PM)daromer Wrote: As i said you lnly melted the solder on top of the cells Smile if u dont get it to flow even when heating the cells try some sandpaper first

You were right :Big Grin ill give that a shot too 
(05-19-2017, 02:45 AM)jdeadman Wrote: Soldering Cells is all about the Size of the TIP.   The bigger the tip the easier it is to heat up the surface and not heat the internal part of the cell

I have a Hakko that allows for different tips and I use it for tiny stuff with the 0.5mm tip and Batteries with the 5mm Tip.  the Bigger one takes longer to heat up but I can solder a cell within the count of 3

Took that advice
Check the picture. Used the bigger tip I got with the iron. placed the 5mm wide bit on the cell vertically for 2 secs then put some solder. Certainly better results.
Left column left solder, right column right solder.
Should I stick for the lead 60 one? it seems to flow better

Yep, I think we have a winner!
Not pretty but better contact


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#9
Winner winner chicken dinner
The-J-Man and BlueSwordM like this post
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#10
Hi folks,

there are some cells which are difficult to solder. Not only you are facing this phenomonal but also in other forums peaple are telling about this problem.
Some Sony types and unknown manufacturer from China use some kind of inox metalls.
Just scratch them with sandpaper and solder after - mostly it works. Daromer told it already.
But one time I've got few cells I couldn'n solder them - have to abandon them.
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