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Authors
Abstract(s)
Este trabalho final de mestrado tem como objectivo avaliar a influência das diversas características físico-químicas da matéria activa positiva na performance inicial de baterias VRLA AGM em descargas rápidas.
Este estudo incidiu sobre a variação de parâmetros nas áreas do fabrico de pasta, empastamento e sazonamento. Foram preparados 7 lotes de pastas e as placas positivas resultantes dos mesmos deram origem a 7 versões, compostas por quatro baterias. Paracada versão, três baterias realizaram ensaios de capacidade e a restante foi sujeita ateardown.
Executaram-se regressões lineares entre as características e a capacidade (Cp10min).
Em detalhe, foram efectuadas regressões lineares entre as descargas rápidas (Cp15min e C1) e uma descarga lenta (C10) para as seguintes características: densidade socada, absorção do ácido sulfúrico e água do pó de chumbo, temperatura final e densidade dapasta, humidade da placa após forno de secagem, teor de α–PbO, β-PbO, hidrocerussite, rácio 3BS:4BS e porosidade da placa após sazonamento e rácio PbSO4:PbO2 da placa após formação.
Este estudo permitiu concluir que as características estudadas em detalhe exibem uma influência significativa no desempenho da bateria para descargas rápidas com a excepção do teor de α–PbO, de β-PbO e do rácio 3BS:4BS. Este estudo resultou na obtenção de valores óptimos para as diversas características nas condições experimentais estudadas.
Abstract: This master thesis aims to evaluate the influence of various physicochemical characteristics of the positive active material in the initial performance in high rate discharges in VRLA AGM batteries. This study focused on the variation of parameters in the areas of paste preparation, pasting and curing. Seven batches were prepared of paste and the resulting positive plates thereof originated 7 versions constituted by four batteries. For each version capacity tests were performed to three batteries and one was subjected to teardown. Linear regressions were performed between the characteristics and the capacity(Cp10min). In detail, linear regressions were made between high rate discharge (Cp15minand C1) and a low rate discharge (C10) of the following characteristics: tapped density, absorption of the sulfuric acid water of leady oxide, final temperature and paste density, the moisture of the plate after drying oven, content of α-PbO, β-PbO, hydrocerussite, 3BS:4BSratio and porosity of the plate after curing and PbSO4:PbO2 ratio of the plate after formation. It was found that the characteristics studied in detail exhibited a significant influence in battery performance for high discharges with the exception of the content of α-PbO, β-PbO and of the 3BS:4BS. This study resulted in obtaining optimum values for the various characteristics in experimental conditions studied.
Abstract: This master thesis aims to evaluate the influence of various physicochemical characteristics of the positive active material in the initial performance in high rate discharges in VRLA AGM batteries. This study focused on the variation of parameters in the areas of paste preparation, pasting and curing. Seven batches were prepared of paste and the resulting positive plates thereof originated 7 versions constituted by four batteries. For each version capacity tests were performed to three batteries and one was subjected to teardown. Linear regressions were performed between the characteristics and the capacity(Cp10min). In detail, linear regressions were made between high rate discharge (Cp15minand C1) and a low rate discharge (C10) of the following characteristics: tapped density, absorption of the sulfuric acid water of leady oxide, final temperature and paste density, the moisture of the plate after drying oven, content of α-PbO, β-PbO, hydrocerussite, 3BS:4BSratio and porosity of the plate after curing and PbSO4:PbO2 ratio of the plate after formation. It was found that the characteristics studied in detail exhibited a significant influence in battery performance for high discharges with the exception of the content of α-PbO, β-PbO and of the 3BS:4BS. This study resulted in obtaining optimum values for the various characteristics in experimental conditions studied.
Description
Trabalho Final de Mestrado para obtenção do grau de Mestre em Engenharia Química e Biológica
Keywords
Matéria activa positiva Positive active material Baterias VRLA AGM VRLA AGM batteries Descargas rápidas High rate discharges Fabrico de pasta Paste preparation Empastamento Pasting Sazonamento Curing
Citation
PIMENTA, Bruna Oriana de Meneses - Dependência entre a performance de baterias VRLA e as características Físico-Químicas da matéria activa positiva. Lisboa: Instituto Superior de Engenharia de Lisboa, 2014. Dissertação de mestrado.
Publisher
Instituto Superior de Engenharia de Lisboa