Modelo híbrido no tempo contínuo para estimação da autonomia de baterias.

Abstract

Batteries are applied in the industry and in the people’s daily life. These devices store electrical energy and may be used in applications such as supplying electrical energy to a telephone exchange during a power outage or providing mobility to electronic devices such as mobile phones. The amount of time that the telephone exchange can run without the grid power or the operation time of a mobile phone is related to the discharge time of the batteries that power them. Thus, the development of estimation methods for batteries discharge time is an important task. It is possible to find in the literature a wide range of models that represent several phenomena of the batteries, which can be chosen according to what must be modeled such as physical, quemical, electrical and electroquemical phenomena. In this work, a hibrid model composed of an analytic and an electric model was developed with the objective of estimating the discharge time of a battery by means of the state of charge and the voltage, with the discharge current as input. The model parameters of a 1050 mAh lithium-ion battery were estimated and the model was developed by means of block diagram and implemented in an Arduino Mega 2560 microcontroller. The validation of the developed model was performed by means of tests with constant values of currents from 150 mA to 1150 mA in real batteries. The errors obtained by the model were higher than 5.00% for values of currents smaller than 350 mA, and smaller than or equal to 3.00% for currents greater than 450 mA.