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Introduction

We have selected equations that make possible a realistic fit of the data sheet experimental discharge curves. In addition to the general shape of the curves that has to be reproduced by the model, there are 4 points of interest :

1. the drop of voltage when the discharge rate increases,
2. the drop of capacity when the discharge rate increases,
3. the drop of voltage when the temperature decreases,
4. the drop of capacity when the temperature decreases.

The model is valid down to a minimum temperature and up to a maximum discharge rate, defined in the form under the section "behaviours at limits"

 

Voltage model

With the lithium-ion model, the internal resistance depends on temperature and the Open Circuit Voltage depends on SOC only.

This differs from the lead-acid model.

 

Capacity corrections

With the lithium-ion model, the capacity correction according to the discharge rate is handled through the peukert coefficient

The capacity correction according to the temperature is handled similarly as the lead-acid model, with experimental correction coefficients which are fit to catch the behaviour as best as possible.