Updating current depending on actual capacity during ageing

[RSPdatascience]

Hi,

During an ageing experiment, how can I update the C-rate after every loop, based on actual capacity rather than nominal capacity ?

I mean something like this:

parameter_values = pybamm.ParameterValues("Chen2020")

model = pybamm.lithium_ion.SPM(
options={
"thermal": "lumped",
"SEI": "ec reaction limited",
"SEI film resistance": "distributed",
}
)

def i_fun_capacity(variables):
capacity = ...................
return capacity * 1

experiment = pybamm.Experiment(
[
(
pybamm.step.CustomStepExplicit(i_fun_capacity, termination="4.2V", direction="charge"),
"Hold at 4.2V until C/50", # It would be nice to replace this C by actual capacity too
pybamm.step.CustomStepExplicit(i_fun_capacity, termination="2.5V", direction="discharge"),
)
]
* 100,
termination="70% capacity",
)

sim = pybamm.Simulation(model, experiment=experiment, parameter_values=parameter_values)
sol = sim.solve()

[Florana1]

Hi, l am also wondering how to get the current remaining capacity. l'm not sure if we could use ['Total lithium capacity [A.h]'] instead. Because otherwise we need to do a full charge-dischagre to determin the current capacity of the battery.