I'm trying to create a 2s3p battery pack for a robot. I have 6x Eastshine e35 cells (which is a protected version of LG MJ1 cells). Is a 2s3p pack out of protected cells used with a balance/smart charger the same as a 2s3p cell with a BMS system? Is it going to be equivalent in terms of safety and performance ?
Personally I would go for a battery pack with protected cells and balance charger and a BMS. Generally protection built into batteries is really a lat resort for protection and safety and shouldn't be depended upon. A BMS will make sure nothing bad happens to the battery and balance charging them will ensure that everything is balanced and back up the job of the other two safety features.
I have used 3s4P lithium-ion batteries for similiar application with only balance/smart charger. Nothing bad happenned but since I am dealing with BMS, I understood thah I was only lucky. So, as I understand from your battery, all cells are individual so you have access all nodes. Buy a simple passive cell balancing card for 2 cells and use it. For parallel battery cells, BMS is not needed.