I need to be able to monitor the individual cell voltages within a pack of 45 lithium cells. Each cell's voltage woud range between 2.5 and 4.0 VDC. I've read that I could use my Arduinio Mega to monitor voltage up to 5 VDC but that measurement depends on a connection to ground.
Obviously, to measure the voltage of one cell in the middle of the pack, I can't measure between a cell terminal and ground.
So are there any options that I can use with an arduino to measure individual cell voltage?
Ideally, I'll want monitor all 45 cells and stop charging the pack when any one of the cells hits a preset voltage.