Contribuições à estimativa das características elétricas e ao tempo de vida útil de baterias de chumbo-ácido.

Abstract

The present dissertation presents contributions to the electrical and to the lead acid lifetime model. Five contributions are presented: the rst four of the electric model and the fth, and last, the lifetime model: I) the selection of the point after discharge decay curve for a speci c case. By using this method is possible an estimate of good quality, compared to using an iterative non-linear optimization method. II) the selection of the point after decay of discharge curve for di erent state of charge values. With this method it is possible to determine the choice of the third point based on the charge and discharge current pro le in which the battery is subjected; III) the estimation of the DC resistance by the model equations in the study. The estimation quality is compared to the given resistance calculation method for two standards. IV) the choice of the ltered current time constant. This choice varies for each lead-acid battery and should not be predetermined. V) the widespread degradation equation of lifetime model to contemplate any lead-acid battery. The change makes the lifetime of any lead-acid battery to be calculated, as long as they do obtain the necessary parameters. All approaches were tested by computer simulations and proven by experiments. The results served to show the validity and applicability of the developed contributions.