I am currently trying to design a protection circuit for a project of mine that uses a single cell 3.7v lithium ion battery. I found this image online which uses 2 TL431s: 
However, I am really not that good at EE, so I am clueless as to what the unlabeled resister values would have to be in order for this circuit to function properly. I realize that there are protection circuit ICs, but I want to build the actual circuit myself. Does anyone have any insight as to how this circuit works and what the resistor values would need to be?
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