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Table of Contents

Introduction

The MATLAB/Simulink model is based on the paper "A Dynamic Lithium-ion battery model considering the effects of the termperature and capacity fading"

MATLAB / Simulink

File Structure

The Blocks folder contains the Simulink blocks.

The Scripts folder contains the MATLAB scripts used to launch the MATLAB simulation and the text files containing the input data for the simulation.

Matlab
├── Blocks
│   ├── complete_model.slx
│   ├── simulation.slx
│   ├── *.slx
├── Scripts
│   ├── simulink_simulation.m
│   ├── plot_simulation_csv.m
│   ├── data
│   │   ├── input_data.txt
│   │   ├── input_control.txt
│   │   └── results.csv

Blocks

Each block is named after the number of the equation found on the paper (A Dynamic Lithium-ion battery model...) on which the model is based.

File name Description
complete_model.slx Contains the complete model made up of all the other Simulink blocks
simulation.slx Contains the complete_model block and connects it to the input and output MATLAB variables

Scripts

File name Description
delta_E_regression.m Script that finds the potential correction term that is dependant on the temperature. Refer to this paper at Fig. 6
plot_simulation_csv.m Script that plots the output data of the C Model contained in the /data/result.csv
simulink_simulation.m Script that launches the simulation of the Simulink model /Blocks/simulation.slx

Model Description

Complete Simulink model

The above picture shows the complete Simulink model. Four main blocks contain the additional sub-blocks, each is named after the equation it implements.

Detail of Simulink model

The following expressions are implemented in the detailed view of the Simulink model

$C_{rate} = \frac{current}{capacity*3600}$

$SoC_{tot} = SoC_{init} + \int C_{rate}$

$N_{cycle} = N_{init} + \int |\frac{C_{rate}}{2}|$

The idea behind the cycle number counter was con consider each full charge/discharge cycle as one cycle. The counting is made easy by using the c-rate computed above.

Simulink - How to simulate

  • The model inputs are passed via the file /data/input_data.txt
  • Some battery voltage constraints (V_max and V_min) can be set in /data/input_control.txt: the simulation is stopped when the output voltage of the battery leaves the interval between V_max and V_min.
  • Executing simulink_simulation.m launches the simulation.
  • The output data are shown on plots.