Solder-blobbing 14500 and 18650 cells with Bi50Sn18Pb32 (Rose's Metal)

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Barkuti
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Solder-blobbing 14500 and 18650 cells with Bi50Sn18Pb32 (Rose's Metal)

A friend came home recently and accepted to record me doing this:

 

 

Flux employed: Goot Super Soldering Flux.

Enjoy! Smile

 

Cheers Party

hIKARInoob
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Well that looks dang good alright.

jmoots
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How did you create the blobs initially?

-joel

vwpieces
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whats the hardness compared to 63/37 solder?

Barkuti
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Soft. Smile

hIKARInoob
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Everything looks so easy on TV. I bet if I do it you’ll have solder splatters on your camera lens… Facepalm

snakebite
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i just use good ol kester “44” 63/37.
done in about 2 seconds.
and thats with a battery iron.

kennybobby
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But the temperature is much higher, which is why soldering is not used or recommended for Li batteries.

Kester 44 Lead Solder Wire – +682 F Melting Point – Sn/Pb Compound – 37 % Lead

Rose’s metal consists of 50% bismuth, 25–28% lead and 22–25% tin. Its melting point is between 94 °C (201 °F) and 98 °C (208 °F).

snakebite
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yes its a somewhat safer way of doing it.
but if you know how to solder its pointless to order expensive exotic stuff to do this.
i get it done fast enough that the cell end is barely warm afterward.
trick is a good hot iron,and sanding the target area a bit.
if you do it right it will take solder right now.
if you are not sure just practice on junkfire cells.
run them down in something just in case you short it with a solder blob or hold it long enough to melt the seal.
i tried to do that on a scrap cell and i had to keep the iron on it over a minute to see the seal start to melt and extrude.

kennybobby
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snakebite wrote:
…i get it done fast enough that the cell end is barely warm afterward. trick is a good hot iron,and sanding the target area a bit. … i tried to do that on a scrap cell and i had to keep the iron on it over a minute to see the seal start to melt and extrude.

That’s good to know, thanks for doing the test.

Copper wires and conductors should work with your method, but Nickel-plated strips might be difficult to solder due to the need for an active flux and higher tip temperatures.

i worked on a project where some phd’s claimed the wire was defective and not solderable—it was just nickel-plated and they didn’t know the tricks of the trade…

Barkuti
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jmoots wrote:
How did you create the blobs initially?

Sorry jmoots, didn't noticed your question before.

I bought the stuff from eBay seller zhuykoff a few months ago. It came in a sealed bag, in such pip form. Weighed 'em recently, they vary between a bit above 200mg and a tad less than 250mg. Maybe ≈120 pieces per ounce. Smile

Paid $10 for a 75g bag, though I received 85g. Wink

 

Cheers my fellows Smile

luminarium iaculator
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Very good method Barkuti,
Link those small solder balls when available.

For solder blob I use large flat horse shoe tip.

Then I just sand battery surface, flux it, and when large horse shoe tip is loaded with solder i just make fast 1- 2 second down-up move.

Modding is making something how you want it to be, not how it comes stock...

Old-Lumens

Barkuti
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luminarium iaculator, this is my current sale link of choicehttp://www.ebay.com/itm/Roses-Rose-alloy-metal-Lead-Bismuth-Tin-low-temperature-melting-90-gramms/132292315369

There are small formulation differences, or so it seems. Melting temperature shouldn't vary much, though.

Cool stuff, I like it. Smile

 

Cheers 

snakebite
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one place i can see this stuff being useful is making a thermal fuse in a pack.
solder the interconnects in spring tension.if pack overheats alloy melts and opens circuit.
like a grasshopper fuse.
this alloy is often used in sprinkler heads.it melts and activates the valve.

kennybobby
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What about for making the individual cell fuses—that is what i was considering to use it, but was concerned about loose hot solder dripping about in the event that one cell went thermal. Maybe a small blob to hold the cell fuse wire would not be a significant amount to worry…?

Barkuti
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If you assemble a battery pack, you can hang a small weight from the interconnecting wires. This results in an open circuit condition if the batteries reach 93 - 96°. Excellent from a safety standpoint. Wink

snakebite, Thumbs Up .

 

Cheers Party