Electrolyte stratification is known to cause reduced efficiency in the operation of lead/acid batteries. The authors monitor the extent of electrolyte stratification throughout cycle life, under a repetitive deep-discharge cycling regime that typifies electric vehicle battery service. They also investigate any relationship between stratification and the incidence of premature capacity loss (PCL), a known cause of failure under cycling duty. They have found that cells with positive plates based on Pb-Ca and Pb-Sb positive grids both undergo an initial loss of capacity, due to the development of stratification. The relatively short cycle lives and the apparently healthy condition of plates at the end of cycling suggest that PCL, as opposed to the traditional degradation processes of grid corrosion and active-material softening/shedding, is the dominant cause of cell failure. The authors suggest that stratification, under the experimental regime, exerts an overall mitigating effect in the demise of the cells. The reduction in sulfuric acid concentration throughout most of the plate volume ensures that the bulk of the plate cycles in relatively weak acid: such conditions are known to reduce the severity of PCL
Electrolyte stratification in lead/acid batteries: effect of grid antimony and relationship to capacity loss
Einfluß der Elektrolytschichtung in Bleiakkumulatoren auf die Speicherfähigkeit der Batterie in Abhängigkeit des Gitter-Antimongehaltes
1993
12 Seiten, 16 Quellen
Conference paper
English
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