eikido said:
If I ever did a mistake and used a 16s charger on a 14s battery pack, what would be the consequences? Would a some what advanced bms protect from charging over 58.8v?
Because using a 16s charger on a 14s battery pack would charge each cell at around 4.8v which is not good at all. I wonder if the bms would protect it.
it depends on the bms.
if:
the bms has a cell-level hvc that actually works to shut off the charge port,
and
your charger is connected to the charge port (not the discharge port),
and
all the sense wires from the cells are actually connected to the bms and dont' have any problems (so the bms can actually tell what voltage the cells are at)
and
the bms's charge port fets are designed to handle the voltage of the charger you use (so they don't fail, which often results in permanent-on condition)
and
the bms's charge port fets actually work (aren't stuck on, so they will cut off the charger from the battery when commanded)
then
the bms should shut off charge as soon as the first cell reaches the bms's cell-level hvc.
if any of those conditions fails, the bms will not shut off the charge, and cells will overcharge.
also, they will only overcharge evenly if the cells are all exactly the same, which is generally not the case in an ebike battery. if some cells have less capacity or higher internal resistance, they'll overcharge more than other cells...how much more depends on their capacity/resistance relative to the others. there's a point at which cells can't handle that any further, and will object dramatically to it....
that's when things get sad.
