[Panzer04]

There's a difference between acceptable standards for a truly professional product that you'd have to certify and hobbyist stuff.

Beyond short circuit/overcurrent, overtemp, over voltage, under voltage protections, what else would be necessary to ensure safe usage of the cells from an electrical perspective? Ie. What additional protections would a batter management circuit need to be safe in normal circumstances?

[exmadscientist]

JEITA profile compliant chargers require temperature monitoring (usually a 10k NTC thermistor). This is the third (yellow) wire coming out of a typical protected cell.

Many people also like to have fuel gauging but that isn't required.