Battery

First Battery Pack (CALB – LiFePO4)

The frist pack was based on 32 LiFePO4 cells. I drove around 10’000km with the pack and it is still working fine. However the range was with 70km quite limited. Further I had to balance the cells from time to time manually. I implemented top-balancer-circuits on every cell but this did not prevent that one or the other cell was drifting away and had to be charged separately.

The advantages for lithium iron phosphate cells are:

  • Robust
  • Save (no thermal runaway)
  • Relatively low cost
  • Easy to handle

The drawbacks:

  • low energy density compared to lithium nickel manganese cobalt oxide cells (Tesla cells -> NMC)

Second Battery Pack (Tesla from wrecked car)

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