Failed for getting results after some cyclings

PyBaMM Q&A
1

Hi,

I’m new to PyBaMM and I want to design an experiment to record my charging and discharging results. However, some results showed as None, I don’t know why. I’ve attached my codes.

import pybamm
experiment = pybamm.Experiment(
[
“Discharge at 1C until 2.5V”,
“Charge at 1C until 4.2V”,
] * 2
)
model = pybamm.lithium_ion.DFN()
params = model.default_parameter_values

sim = pybamm.Simulation(model, parameter_values=params, experiment=experiment,solver=pybamm.CasadiSolver(mode=“safe”))
solution = sim.solve(save_at_cycles=range(4))
cycles = solution.cycles
print(cycles)

Results after each cycle:
[<pybamm.solvers.solution.Solution at 0x314504170>,
None,
None,
<pybamm.solvers.solution.Solution at 0x313676b40>]

Thanks!

2

Hi @FrankW9997, the save_at_cycles keyword only works with integers or lists of integers. To fix the issue, please replace solve line with

 solution = sim.solve(save_at_cycles=list(range(4)))