On 2019-05-13 16:22, jkenny23 via EV wrote:
theres lots of YT vids about spot welding with simples nachines
Where are you finding cells for $1 each? Going rate for 18650s (new) is
$180/kWH or so, which for a typical 2.6AH cell would be $1.73.
Li-Ion (and related sub-chemistries, e.g. NMC, LMO (uncommon), LCO,
etc.)
are 3.7V, and are higher energy density but less "safe".
LiFePO4 is 3.2V, and is considered more safe, but is less common, more
expensive, and lower energy density. That said they usually have
high/er
power density.
I solder, but that's because I don't have space/money for a spot welder
(at
least not a quality one). Cheap spot welders aren't too good, and
results
are mixed. Too much power and you blow a hole in the cell, too little
and
you get weak connections. Cleaning up is also annoying if you need to
change
out a cell. I prefer to solder, with individual cell fuses for each
cell (I
use 30ga tinned copper wire, which blows at ~20A in a short circuit).
Better
is using individual glass fuses with solderable legs, which go down to
0.5A
in rating, but the breaking point experimentally appears to be about
twice
the rating.
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