I have always found that if you are fast with a hot iron then they don't know what's hit them.
Basically the cells resistance will stop the heat from travelling through the cell. Using a weak iron will heat up the whole cell before heating up the contacts to the required temperature.
I think another reason spot welds aren't used in racing batteries is because the welded tabs are incredibly thin and don't carry the current as effectively as teh chunky battery bars we are used to.
Of course, as well as soldering the cells we also massiveley exceed the charge rate compared to the manufacturers recommendations, no wonder they don't survive the 500/1000 cycles in the specs!
|