Beginners Guide to Processing 18650 Cells | Cell Database


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Wrong solder or just bad soldering technique?
#11
Thanks. Thats the iron I'm using now, I'll buy the tip you referenced and give it a try.
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#12
Oh, if you have the exact same iron, then you shouldn't be having any problems at all. Something doesn't sound right. Is the tip oxidized? I stick mine in the bench grinder with a wire brush every so often to clean off oxidation. Also, the tips screw on. Use a pair of pliers to make sure it's nice and tight. If it's not fully tight, heat won't transfer right.
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#13
Thanks again
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#14
Thanks Mike, I am going to return the POS soldering iron I bought on Amazon and get this one. I think I fell for the look of the X-TRONIC 3000 but when I used it, man what a POS. I just had to spend way too much time on a cell.
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#15
Hi Guys.

i've been using a weller 100 watt iron with a large soldering iron tip, but, as far as i can tell, i'm still having issues with excess flux.

if you have a few minutes, would you please take a quick look at the attached video?

if i can't stop having extra flux, is there a way to remove it safely?

I'm only concerned if the flux will eventually eat into the battery cells.  if the cells are fine and the flux won't damage them, then i'm fine with the extra flux.

https://youtu.be/5gpypQ83H90
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#16
I brush all my cells afterwards to get rid of the excess flux:

I hav it in one of my videos of youtube and was going to link it in but dont find it. I use a normal wirebrush and it works great.
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#17
(09-01-2017, 12:05 PM)daromer Wrote: I brush all my cells afterwards to get rid of the excess flux:

I hav it in one of my videos of youtube and was going to link it in but dont find it. I use a normal wirebrush and it works great.
Do you include something like rubbing alcohol?
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#18
No i dont. I wouldnt do that on the positive side atleast. on negative it should be fine.

By just brushing it most of the excess is removed. If its enough im not sure though. But its better than from start.
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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
Question.... Is soldering just as good as spot welding? I need to build my first battery pack and was not sure which way to go.
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#20
I would say yes. So as long as the solder joint is done correctly. The biggest difference electrically would be that solder has full contact between cell material and wire; whereas the spot welding only really has 4 solid connections.

There isn't really anything wrong with either method. Either one will work equally as well, and last just as long as the other; so as long as they are done correctly.
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