Hi,
To build a BMS partially responsible for vehicle safety (and possibly your garage/house) - it is wise to adhere to a relevant safety standard before doing too much design work. It is usually easier to implement by design than by redesign (that lesson I know from experience ;-) )
Here is a public list of battery standards:
Many of the mentioned standards are not relevant for us, and the list is probably not complete either, but I think it still is worth a look.
One standard, ECE 100 Construction and functional safety requirements for battery electric vehicles might be a good starting point?
Cheers,
Per