shouldnt solder Nicads Vrs nimh
11-04-2005, 05:33 AM
#3
RE: shouldnt solder Nicads Vrs nimh
ORIGINAL: garcay
Then how do you solder them?
Then how do you solder them?
Soldering to Ni-Cds is not a good idea. Try to use the welded tabs and solder to those if at all possible. Soldering to the positive button will have a very high probability of destroying the nylon seal. You just can't get the button hot enough to get a good solder joint without compromising the integrity of the nylon seal ring. This ring is under compression and raising its temperature will allow it to relax and the sealing properties are history.
If you can hold a penny between two fingers long enough to get a good solder joint with #18 stranded wire or braid, then go ahead and solder to your cells, otherwise get cells with solder tabs. Remember, nylon is a good insulator, electrical and thermal. There is no thermal path for the soldering heat to dissipate when heat is applied to the cover button of a cell.
Nylon characteristics:
Nylon has its glass transition at 460°F - 500°F . The maximum use temperature of nylon 6-6 parts is about 300°F. (Note that this is considerably below the glass transition temperature.)
Soldering temperatures are in the 450°F to 650°F range.
I realize this flies in the face of all the electric flight “experts†that assemble their own packs but it is never the less fact.
You have never seen a pack assembled by a cell manufacturer or any other pack manufacturer (outside of the hobby market) where connections are soldered directly to a cell. There is a reason.
11-04-2005, 05:55 AM
#4
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RE: shouldnt solder Nicads Vrs nimh
ORIGINAL: suzonka
they dont recomend to solder Nicads because of the Nylon seal , it may be desroyed at the positive end , what about the Nimh do they have the same seal ,can you solder them?
they dont recomend to solder Nicads because of the Nylon seal , it may be desroyed at the positive end , what about the Nimh do they have the same seal ,can you solder them?
11-04-2005, 08:36 PM
#8
RE: shouldnt solder Nicads Vrs nimh
ORIGINAL: garcay
So are you saying I should buy a cell that already has the tab attached? To the + end.
So are you saying I should buy a cell that already has the tab attached? To the + end.
11-05-2005, 08:07 PM
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RE: shouldnt solder Nicads Vrs nimh
Thanks. I use a unorthodox technique w/silver solder and flux. I hold the tab on the battery with a small piece of solder between it and the battery end. Put the soldering iron right on the tab and it immediately flows. It sticks real good.
