Battery and BMS: 12s13p Sanyo 20700B and 200a smart BMS
This thing is huge. It weighs a ton, but it’s certainly not going to lack punch or power. I’m hoping to get around 70-80km range out of it, time will tell.
I made a jig to glue up all of the cells into their p groups. Love this jig, so easy to make, every battery builder should have one.
I used silicone to glue the cells to try and reduce the amount of heat that the cells are exposed to. It should be mentioned that any time you are using silicone with electronics, you should be using neutral cure silicone.
The silicone works well, but needs at least 24hrs to cure properly! Not for the impatient man.
Welded the parallel connections and then I wrapped each of the p groups with cloth tape, conforming to the curves of the cell as I wanted the battery to be in a staggered pattern.
I considered using fishpaper for this, but I planned on gluing the whole pack together with silicone anyway so I made the executive decision that cloth tape would be enough as there should never really be any abrasion between groups.
Pack siliconed together and under clamp power for over 72hrs while series connections commenced.
Initial series connections completed and battery at correct voltage
Right now I am working on getting this battery capable of efficiently delivering 200a continuous. It’s tedious.
Smart BMS: https://s.click.aliexpress.com/e/rhASYNF2
Gone out on a limb here and ordered this guy (200a version) from AliExpress. Hasn’t arrived yet so not much to say just yet. Does anyone have experience with this BMS?