Battery Simulator - battSIM

The MATLAB function battSIM simulates the electrical behavior of a battery using an equivalent-circuit model (ECM). It includes:

• State of charge estimation using Coulomb counting.
• Open-circuit voltage lookup from a given SOC-OCV table.
• Flexible ECMs based on zero, first, second, or third-order RC circuits.
• Noise simulation for both battery current and voltage.

Define load current (depending on usage)

dt    = 0.1;               % Time step (s)
Tmax  = 10;                % Maximum simulation time (s)
t     = (dt:dt:Tmax)';     % Time vector
I     = ones(size(t));     % Constant load current (1 A)

Define battery parameters for the simulation

% Battery parameters
Batt.soc0 = 0.5;    % Initial SOC (0 to 1)
Batt.Q    = 4;      % Capacity (Ah)
Batt.R0   = 0.02;   % Internal resistance (Ohms)

% SOC-OCV lookup table
Batt.SOC_OCV_LUT = [  
    0.0000    2.5000  
    0.0050    2.8080
    0.0352    3.1179
    0.0854    3.3182
    0.1357    3.4193
    0.2915    3.5826
    0.4523    3.6941
    0.8392    4.0664
    0.9548    4.1121
    1.0000    4.2000  
];

% RC circuit parameters
Batt.ModelID = '3RC';  % Model type: 'R0', '1RC', '2RC', '3RC'
Batt.R1 = 0.0015; Batt.C1 = 2400;
Batt.R2 = 0.0030; Batt.C2 = 1500;
Batt.R3 = 0.0080; Batt.C3 = 2000;

Run simulator (without noise)

[vbatt, ibatt, soc, ocv] = battSIM(I, t, Batt);

Run simulator (with noise)

sigma_v = 1e-3;  % Voltage measurement noise (V)
sigma_i = 1e-6;  % Current measurement noise (A)
[vbatt, ibatt, soc, ocv] = battSIM(I, t, Batt, sigma_i, sigma_v);

References

If you would like to learn more about battery modeling and battery management system design, refer to:

@book{balasingam2023robust,
title={Robust Battery Management System Design With MATLAB},
author={Balasingam, Balakumar},
year={2023},
publisher={Artech House}
}

For more details on SOC-OCV lookup table: https://github.com/soorajsunil/Piecewise-Battery-OCV