First Battery Pack (CALB – LiFePO4)

The first battery 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/discharged 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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