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J-Mans project
#11
(05-19-2017, 12:08 PM)BigBen Wrote: 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.

Well Im still hoping my samsung cells are genuine :Big Grin



Ran out and got some more lead 60/40 solder, is better then the 40/60 i used before but it still seems a bit ball like for my liking...
That small roll of solder seems better but its years old an I have no idea where I can get it. 

Any recommendations regarding a specific brand that you guys know works well?



Hang on, I put some more of that solder grease on the cell and now its looks better!


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#12
Dont add so much solder. Its not needed Smile and you dont need to add anyrhing oif you have solder with flux and or rosin
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#13
(05-19-2017, 03:24 PM)daromer Wrote: Dont add so much solder. Its not needed Smile and you dont need to add anyrhing oif you have solder with flux and or rosin

Hahaha im good at overkill :Tongue
On the solder it says you dont need to add additional flux, but with it it worked much better. hmmm

Next up, soldering to the busbar.
Got the wire for this bus bar out of an electric motor. Ill be using earth cable for the main ones but htis is just a test. THe thin fire is from the main cable from the hoverboard battery packs. No idea what its rated for but I charged some batteries at 4A through it and it did get just slightly warm. Need to test it at one stage.

problem is the solder just isnt sticking to the copper. No chance, it staying on the iron and not flowing to the copper. And when it does seem to stick, i just need to touch it and it comes straight off.
Any more ideas gents?  Heart


edit: Shit I think it has a coating on the wires.....


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#14
The wire used in motors is enamel coated. It can't soldered to unless you strip that part of the wire clean. You 'could' still use it, you'd just need to take a little sand paper to clean the wire first. A lot of extra work, imho.

The other type of "fuse wire" you could use, is go to the arts/crafts section of your favorite low budget store and get the silver/copper crafting wire. It'll blow at a low ampere (just not sure exactly where).

As far as soldering goes, I pretty always use flux with my solder, regardless if it's flux/rosin core. I find that the solder sticks a whole lot better with the extra cleaner. It's not like the stuff stays very long once heat gets to it.
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#15
(05-19-2017, 04:55 PM)Korishan Wrote: The wire used in motors is enamel coated. It can't soldered to unless you strip that part of the wire clean. You 'could' still use it, you'd just need to take a little sand paper to clean the wire first. A lot of extra work, imho.

The other type of "fuse wire" you could use, is go to the arts/crafts section of your favorite low budget store and get the silver/copper crafting wire. It'll blow at a low ampere (just not sure exactly where).

As far as soldering goes, I pretty always use flux with my solder, regardless if it's flux/rosin core. I find that the solder sticks a whole lot better with the extra cleaner. It's not like the stuff stays very long once heat gets to it.

Well that explains it  Big Grin Yeah thats a lot of wires to sand off... I presume I would have to untwist it and clean each one then redo it? 
Can I burn it off with a blow torch?

I have a 1€ store close by, ill check it out tomorrow!

Ill be using the flux as well from now on, gives a cleaner results too as I can wipe it off afterwards and it all just silver. Without it its brown, as you can see from my previous photos, and that stuff barely comes off!
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#16
if you can remove it from the pack just heat it up with a torch and solder flux should clean it up nice
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#17
You just gave me a great idea, all the cells destined for the scam heap will become unwilling recipients of my solder experiment. I noticed that you are using a large iron tip, is this the best advice???
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#18
Always use big iron tip with alot of mass. Watt is not as important as the actuall mass is on the iron
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#19
(05-19-2017, 06:47 PM)jdeadman Wrote: if you can remove it from the pack just heat it up with a torch and solder flux   should clean it up nice

Ill give it a shot!

Edit: nope didnt work. Not worth trying to make it work, ill wait for my earth cable to arrive.
(05-19-2017, 06:48 PM)Robert Baumer Wrote: You just gave me a great idea, all the cells destined for the scam heap will become unwilling recipients of my solder experiment. I noticed that you are using a large iron tip, is this the best advice???

Yes do that  Big Grin  
The other iron I have with a small tip cooled down when applying the solder so that was crap. A small tip with high watt seems to work but less watt and a big tip (as daromer said) works well because of the thermal mass the tip has.
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#20
Bummer. Yea I used multi strand house wire that I saw a few guys using. Working well so far. But I just killed my charge controller so I need a new one
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