Ianhill
1 MW
- Joined
- Sep 25, 2015
- Messages
- 2,872
I've just built a 10s9p pack I picked individual fuses added to each cells instead of digitally protecting the battery as bms can fail and cause a fire, with a couple of lithium's in parallel the current is so high that it can melt the fuse wire nearly instantly if one cell fails, I then use low voltage alarms on a 10s balance lead split into 2 5s jst connectors and a 300w 10s I charger, i feel its safer charging more accurate balancing, only downside each fused cell adds more resistance but as your paralleling them up the resistance of the pack will be low and provide high peak power. There's a big argument to BMS or not and I choose not too with my 10s9p pack on a scooter I've covered many miles with no issue running a 36v 500watt unite motor and pulls well over 1000watt uphill I climbed a 1000ft mountain the pack was barely warm to touch , I think a single cell pack needs a BMS as the current can't reach the heights of a multi parralel pack, Tesla cars packs are fused in series and parallel configuration I believe as they use so many cells faluire current would be in the kilo amp range but obviously they will have a very safisticated BMS along side.