I am trying to design a protection circuit for a single cell lithium battery, and I was hoping for some advise on what things I need to consider.
So far, my thoughts are to provide low voltage cutoff using a comparator. A fixed voltage would be provided to the comparator using a diode, and a variable voltage from a potential divider between the battery terminals. When the voltage from the potential divider goes below the voltage accross the diode, then the comparator would turn off a MOSFET that allows power to the load. So, while the battery is above ~3V, the MOSFET stays on and powers the load, otherwise turns off and then the only current draw on the battery is from this circuit, which should be very low, and hopefully take a long time to deplete the battery to a problematic level.
I plan on having a battery charging module connected directly to the battery terminals. Is it possible that while not charging, this would allow the battery to discharge?
Can anyone tell me if the design I described is a suitable way to implement battery protection, and if there is a better way. Are there any ICs that would be recommended specifically for this purpose, and what are their advantages?
Thanks in advance.