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Cooling 18650 cells for soldering?
#11
There are 2 ways to minimize damage to the cell when soldering the cell:

1. Use a large powerful soldering iron(80W+) to solder quickly. That can be quite hard to do, but with experience, it gets simple, and can be done in 2 seconds.

2. Create a RSU with carbon electrodes and solder paste.
This is an idea I've recently tried, and it's absolutely insane how quickly it actually bonds the solder paste to the steel canister.
It's like a spot welder, but with the ability to connect copper directly to the cell in about 1 second!

What you can also do is just put a fan right besides the cells you solder. Helps with heat dissipation.
The power of lithium ion is in our hands!
We'll show them what we're made of!
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#12
Please see my guide about this here:

https://xaeus.wordpress.com/2014/04/20/s...damage-en/

The article was written specifically for such a case.
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#13
(03-07-2019, 06:54 AM)Overmind Wrote: Please see my guide about this here:

https://xaeus.wordpress.com/2014/04/20/s...damage-en/

The article was written specifically for such a case.

Here's a quote from the above blog ...... 

"Note: if your soldering iron takes quite a lot to heat up (30 sec +), remove it’s tip in favor of a thinner one. A 1mm wire tip will heat up significantly faster than a 2mm wire tip. Do not exaggerate though. If it’s too thin, it will melt."

I'm not sure if something has been lost in translation, but the above, and a fair bit of the other content in that particular entry is complete nonsense, especially the bit about using a frying pan as a heatsink "as long as it's not to waxed"
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#14
Guys, you need to learn how to solder better! And not thinking of ways of masking the mistakes by coming up with weird ideas!!

First of all you have to just put enough heat in a tiny localized area then apply the solder (preferably with a rosin core) and voila you have a perfect solder. I find a small chisel tip works best. Very minimal heat generated and dissipated right away.


Now before someone chimes in and say that the above looks like a bad solder and it's a cold solder, I can tell you it's not. It's just a perfectly placed solder with minimum waste. If you want to see a bad cold solder, look below. That's a bad cold solder. THat's what happens when you use a cheapo 40W soldering iron that has no power and you try and try until you find that perfect bubble and think it's good. Well it's not, just prick it with your fingernail and it's off!

 


Or some of you have chosen the brute method and got the largest chisel point for an iron that is used in making stained glass windows. First of all that's completely unnecessary. It's a waste of solder and then you have to deal with the issue of heat. In this case you would generate a lot of heat to that part of the cell. So could be potentially unsafe, and can be avoided by getting the right tip. Save on your solder, I have a 1lbs roll for over 20 years and I've made a whole 7s60p pack (my first pack) on it and it still is fairly full.



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#15
I use an Ersa industrial soldering iron with 50W you is better than some China soldering iron with 100W or more. And in addition solder grease which is applied with ear stick goose thin, just wiped thin. And so I walk well on all cells whether Sony, LG, Panasonic or others.

Soldering time for a 60 cell package is about 10 minutes with 120 solder points. Time per cell about 2 seconds Contact + - 1 second.


 



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#16
Lötfett is a no-go, my friend.
Thats for the gutters, at most.

( Lötfett ist schlecht, das ist nur für die Dachrinne)

And you may beat me, but the solders look like missing power of the solder iron. (at least some...)
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#17
I tried a 300watt iron at first for 'quick touch' but it was too heavy and tip crumbled rapidly.

Settled on Weller 100watt iron + Kester 24-6337-0027 Solder Roll, Core Size 66, 63/37 Alloy, 0.031" Diameter. Over 5,000 soldered and counting...

The worst mistake I saw was not soldering per-se but someone used the wrong kind of solder that corroded the batteries over time.
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#18
(03-08-2019, 08:59 PM)Cherry67 Wrote: Lötfett is a no-go, my friend.
Thats for the gutters, at most.

( Lötfett ist schlecht, das ist nur für die Dachrinne)

And you may beat me, but the solders look like missing power of the solder iron. (at least some...)

Indeed. Plumbing flux will eat the coating on the batteries and cause them to corrode. It contains Zinc Chloride. Even though the ammonia content should cause it to self neutralize, it will still remain slightly acidic. Also, the coating around the solder will be damaged.
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#19
Yep.

If the plated nickel layer of the cell is destroyed(like with sandpaper), then the zinc chloride will just eat the steel.
The power of lithium ion is in our hands!
We'll show them what we're made of!
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