I need to build a 12s 4p battery pack to power a hub motor for an electric unicycle project. I found that the cheapest batteries with the greatest density are 18650's (the same ones Telsa Motors uses). So, I need to combine them as described above, however, I fear I won't build the pack properly and they may overheat and/or explode.
Even Ladyada warns about putting Li-ion batteries in series or parallel. Her advice is "you should upgrade to a larger battery."
[u]Hub motor specs:[/u]
- Max current: ~20A
- Most efficient at 7.5A
- 48v/1000W (up to 60v max)
I was planning on buying these Li-ion cells since they are the best deal around. Of course, it's eBay, so I ordered a few to test before ordering 48 of them.
I've looked around online and I haven't seen anything on DIY versions of these packs with more than ~8 cells. I briefly looked over Tesla's patents, but they aren't too insightful.
Thanks in advance!