I am trying to measure the temperature of a battery pack using Zener diodes.
I want to use Energus's Tiny BMS 30A. In their battery modules they use Zener diodes to measure the temperature of the pack like this:
I want to copy their design, as it is very elegant and simple. But I need a Zener diode which can match the voltage curve of the ones used in their design, sadly they don't specify the diode.
I am having a hard time wrapping my head around voltage temperature coefficients. I can't find a graph showing the relation between temperature and voltage for Zener diodes I looked at.
I also a bit package constrained, to SOD-323, SOD-523, SOD-723. The supply voltage is +5VDC.
Help would be greatly appreciated.