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Development of a lifetime model for VRLA batteries used in wind turbine generators

TL;DR: In this paper, an approach to predict the remaining lifetime of lead-acid battery is described, which is used to provide back-up power to keep essential devices within wind turbine generators operational under emergency conditions.
Abstract: An approach to predict the remaining lifetime of lead-acid battery is described. The battery is used to provide back-up power to keep essential devices within wind turbine generators operational under emergency conditions. The approach is developed from a circuit model of the battery. From the results of laboratory tests, changes in the model parametric values due to ambient temperature variations, battery aging effects as well as discharge current level have been quantified. Through a developed computational method, the terminal voltage and state of charge of the battery at any other discharging conditions can then be calculated. The discharge profile allows one to predict the remaining lifetime of the battery. The predicted results appear to agree most satisfactorily with that obtained from laboratory measurements.

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Journal ArticleDOI
TL;DR: In this paper, a method for estimating lifetime of valve-regulated lead-acid (VRLA) batteries used in float service under a variable-temperature environment was developed, and an effective means of shortening the period of an accelerated-lifetime test on a battery under cycle use was devised.

10 citations


"Development of a lifetime model for..." refers background in this paper

  • ...Thus, the battery life will decrease with an increase in ambient temperature [12]....

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  • ...One is due to floating service and the other is cycle use [12]....

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  • ...Indeed, typically the lifetime of a VRLA battery will be halved for every 10°C rise in ambient temperature [12]....

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Journal ArticleDOI
TL;DR: In this paper, the diffusion of lead ions in a dissolution-electrodeposition mechanism is the rate-determining step during recharge at higher overvoltages, which can be explained by a dissolutionprecipitation mechanism and a solid-state reaction working in parallel.
Abstract: Cathodic polarization curves for discharged and partially recharged porous lead/lead sulfate electrodes exhibit limiting current densities, which increase strongly with a decreasing concentration of sulfuric acid. Together with an order of magnitude estimate of the diffusion rate, this indicates that the diffusion of lead ions in a dissolution-electrodeposition mechanism is the rate-determining step during recharge at higher overvoltages. The addition of organic expander impedes the electrode process. The rate of discharge influences the potentiostatic recharge curves in a way, which can be explained by a dissolution-precipitation mechanism and a solid-state reaction working in parallel.

1 citations