tailieunhanh - A new material to reduces curing time and improve curing reproducibility of lead–acid batteries

This paper introduces a technology that considerably reduces the time to cure the positive plates of lead–acid batteries. In each of several full-scale trials at automotive and industrial battery manufacturers, the simple replacement of 1 wt.% of leady oxide with finely-divided tetrabasic lead sulfate (SureCureTM by Hammond Group Inc.) is shown to accelerate significantly the conversion of tribasic lead sulfate (3BS) to tetrabasic lead sulfate (4BS) in the curing process while improving crystal structure and reproducibility. . | ELSEVIER Available online at ScienceDirect Journal of Power Sources 158 2006 1133-1139 SureCure A new material to reduces curing time and improve curing reproducibility of lead-acid batteries David P. Boden Daniel V. Loosemore G. Dean Botts Hammond Lead Products Division Hammond Group Inc. 2323 165th Street Hammond IN 46320 USA Received 3 January 2006 accepted 9 February 2006 Available online 4 April 2006 Abstract This paper introduces a technology that considerably reduces the time to cure the positive plates of lead-acid batteries. In each of several full-scale trials at automotive and industrial battery manufacturers the simple replacement of 1 wt. of leady oxide with finely-divided tetrabasic lead sulfate SureCure by Hammond Group Inc. is shown to accelerate significantly the conversion of tribasic lead sulfate 3BS to tetrabasic lead sulfate 4BS in the curing process while improving crystal structure and reproducibility. Shorter curing times result in reduced labour and energy costs as well as reduced fixed curing chambers and plant footprint and working plate inventory capital investment. 2006 Elsevier . All rights reserved. Keywords Curing time Capacity Lead-acid battery Tetrabasic lead sulfate Tribasic lead sulfate SureCure 1. Introduction The curing of positive plates for lead-acid batteries is a critical operation. During this process the chemical and physical structure of the active-material is established and the plates develop the strength that is required for subsequent mechanical handling. When a paste mix is prepared by conventional methods the primary compounds present are tribasic lead sulfate 3BS 3PbO-PbSO4-H2O 3BS unreacted lead oxide PbO and free lead. It has become apparent to battery manufacturers that a high concentration of 3BS in the positive plates improves the life of batteries. This is the case for both automotive and industrial products. Therefore one of objective of curing is to convert the 3BS 4PbO-PbSO4 4BS .