pathsim-batt 0.4.0

Battery simulation blocks for PathSim

Documentation • PathSim Homepage • GitHub

PathSim-Batt extends the PathSim simulation framework with battery cell blocks backed by PyBaMM. All blocks follow the standard PathSim interface and can be wired into any simulation diagram.

Install

pip install pathsim-batt

Quick start

import pybamm
from pathsim import Connection, Simulation
from pathsim.blocks import Constant
from pathsim.solvers import ESDIRK43
from pathsim_batt import CellElectrothermal

cell = CellElectrothermal(initial_soc=1.0)   # defaults: SPMe + Chen2020
I_src = Constant(5.0)                         # 5 A discharge
T_src = Constant(298.15)                      # 25 °C ambient

sim = Simulation(
    blocks=[I_src, T_src, cell],
    connections=[Connection(I_src, cell["I"]), Connection(T_src, cell["T_amb"])],
    dt=1.0,
    Solver=ESDIRK43,
)
sim.run(3600)
print(f"V = {cell.outputs[0]:.3f} V  T = {cell.outputs[1]:.1f} K  SOC = {cell.outputs[3]:.3f}")

Choosing a block

Two decisions determine the right block: thermal ownership and integration strategy.

LumpedThermal is a single-node thermal block (mass, Cp, UA, T0) that receives Q_dot from a CellElectrical block and feeds back cell temperature.

PyBaMM model compatibility

Thermal sub-model and heat-source options are injected automatically — pass the bare model class with no options=.

¹ Not on PyBaMM 26.7 — there LOQS is a DAE, use a CellCoSim* block instead. It is an ODE again from 26.8 on.

² PyBaMM < 26.7 only — pass pybamm_solver=pybamm.CasadiSolver(mode="safe"); the default IDAKLUSolver errors on LOQS. Fixed in 26.7.

³ initial_soc=1.0 fails because PyBaMM requires event values to be strictly positive at t=0; the "Maximum SoC" event is zero exactly at full charge. Any value below 1.0 (e.g. initial_soc=0.99) works.

import pybamm
from pathsim_batt import CellElectrothermal, CellCoSimElectrical

# Custom chemistry / parameter set
cell = CellElectrothermal(
    model=pybamm.lithium_ion.SPMe(),
    parameter_values=pybamm.ParameterValues("Mohtat2020"),
)

# Lead-acid via co-simulation (DAE model)
cell = CellCoSimElectrical(
    model=pybamm.lead_acid.Full(),
    parameter_values=pybamm.ParameterValues("Sulzer2019"),
    dt=1.0,
)

# Equivalent circuit model
cell = CellElectrical(
    model=pybamm.equivalent_circuit.Thevenin(),
    parameter_values=pybamm.ParameterValues("ECM_Example"),
    initial_soc=0.9,
)

License

MIT