In my application, I will have a charging source (alternator) that has a voltage regulator to charge at a maximum of XX.X volts, so over-voltage isn't an issue (barring alternator failure). As far as discharging goes, 3.2V cells would never go under 2.5V, and 3.7V cells would never see less than 3V. Now, with that being said, assuming the cells being used can safely handle 2C charge and 10C discharge...is there really any need to have an expensive BMS that monitors the charging and discharging, if my application stays well within the spec'd C ratings and where the voltage is controlled on the upper end while also never being close to dangerous low voltage levels? I figure a type of cell balancing system that uses the excess capacity at the top of the charging cycle to then balance the cells as the battery drops to it's natural resting voltage, would be enough to keep everything in check.
Am I just over-simplifying this?
Am I just over-simplifying this?