My team and I are working on developing a wearable device (like a heart rate monitor with IP68 dust/waterproofing) and we're utilising wireless charging for our 3.7V 350mAh non-removable battery.
We'll be using TI's BQ51050B IC and whilst it performs the roles of wireless receiver and battery charger in one IC, I noted that it does not perform the full suite of voltage, current and temperature protections that a good battery management system (like the BQ77905) does.
I have reviewed a few different safety standards including IEC, UL and CE and they all discuss the potential hazards however don't give a definitive verdict as to whether the BMS would be advisable for small wearables specifically.
Given the experience on this forum, would these extra protections be necessary/advisable in an internationally distributed small wearable product or would they be unnecessary? In other words, is a BMS necessary with a 3.7V battery or are they are primarily designed and aimed at things like cordless drills which are usually 18V+?
Kind Regards, Andy