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Please Criticise my Circuit and Layout

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Pentoad:
Hello again,

I have been doing further work on my battery management system idea. Shown here is a balancing module with adjustable setpoints for low voltage cutoff, overvoltage cutoff and balance voltage.
I still feel it's a bit basic and there probably needs to be some extra resistors and capacitors put in somewhere.

Ideally, it will be accurate to within a millivolt.

Each cell in the battery will have one of these modules which will be connected to an external unit via optocopler. The external unit will control relays for disconnecting the charger on overvoltage and disconnecting the load on undervoltage.

I'm just looking for some expert opinions on whether this idea will work at all.



teksturi:
Do not leave op amp inputs floating https://www.analogictips.com/working-op-amps-tying-floating-pins/
Do not use 4 wire cross junctions
You need decoupling capacitor for U1.
Voltage dividers should be placed close to input pins.
Component designators can be placed better. You have lot of room in your board.
Why no ground plane on the other side?
Your traces should go 45 angle only.
In schematic there is H3 and pcb there is P3?

It seems to at least to me very hard to understand because there are no headers. How should I know what you want to do with R2, R3 and R4? How about what is the function for output1 and output2 in optocoupler? Please but this kind of info in your schematic. You can even but info how you get some of those resistor values. But math in and show us and your self how you get those values. It will be much better when you watch it after month. Also you may want to use op amp symbols. Maybe that way this will be more readable.

teksturi:
And because I was bored I make this to show you The path.
I have also use more meaningful designators.

Edit: Designators

Pentoad:
Thanks everyone. Regarding the resistors, I just looked at datasheets and used the values provided in their example and test circuits. I also did a few current calculations to make sure the comparator wouldn't be overloaded with driving the mosfet and optocoupler.

For the decopling capacitor, would that just be placed in parallel with the comparator power supply as close to the chip as possible? Maybe 100nf would do but I'm not too sure how that would be calculated

splin:
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