Which Nickel strip size do you use for your 18650 packs?

eikido

10 W
Joined
May 8, 2019
Messages
94
I would like to create a poll but it doesn't seem possible for me but i would love to hear what nickel strip size you use.
 
I mostly make power tool batteries and for those batteries i use the ones from Nkon.
Thickness: 0.2mm
Width: 6mm
Length: 30mm
 
Will depend on the discharge amperage one is needing and whether cell spacers are used.

Me personally I now use H strip for cell holders, though also do have 8mm X 1.5mm pure Ni as well as 0.15mm sheet.
 
This is not an effective way of asking for empirical data on how much current the strips can carry. That data not only exists it has been posted in easily digestible format in one place.

Enjoy:
https://endless-sphere.com/forums/viewtopic.php?t=68005
 
Depending on who I asked, I was told to use 0.15 X 7mm or 0.15 X 8mm Strips. So I used 10mm wide strips. a 2cm long strip between 2 cells of .15 x 10mm has 0.000912Ω, but lets call it 0.001 ohm, rounding up a bit. it's easier to calculate this way. At 10 amps, its dropping 0.1 watt and 0.01 volts between the 2 cells. 0.1 watts doesn't sound like much, but if you consider it's between every cell, then it starts to add up. Watts is Current X Resistance Squared, so 15 amps is .225 watts. 20 amps is .4 watts, between each cell.

From what I've read and been told, 6.5 amps per square MM of Nickel is about the limit of acceptable for battery strips between cells. ideal would be less. As you can see, that works out to just about 1 amp per mm of width with .15 strips.


Here's a couple of calculators.
For flat wire resistance :
https://chemandy.com/calculators/rectangular-conductor-resistance-calculator.htm
For calculating power and voltage drops across those stips:
https://www.rapidtables.com/calc/electric/watt-volt-amp-calculator.html
 
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