Joe Perez wrote:NTS Works wrote:The problem has been that cylindrical cells are hard to electrically connect together. The traditional way to interconnect them is with welded nickel strips. The drawback to this is that the electrical resistance is high, the welds break easily and welding together thousands of cells is very cumbersome.
So, spot-welded connections have a higher electrical resistance than two pieces of metal simply pressed against one another?
I have read reports that the spot welding process can cause an internal damage to the cell which can result in more internal resistance. I am not sure how to prove this.
I too am puzzled why we haven't seen more pop in batteries, like nimh. I suppose it has to do with trying to limit potential liability issues of people sticking them into chargers that over charge? Or sticking cells together that would be imbalanced? Perhaps with the newer lithium chemistry and more advanced charger technology, this will no longer be an issue? Perhaps cells could be embedded with RFID that communicates with the charger to give the important info on charging(voltage, AH, C charge rate).. and if it does not have the RFID tag, it just will not charge?