Qualitative and quantitative analysis method for old negative plate of lead acid battery

Abstract

The invention discloses a qualitative and quantitative analysis method for an old negative plate of a lead acid battery. The method comprises the following steps: firstly, dissecting a tested battery, taking out the negative plate, and cleaning the surface separator of the negative plate; washing the negative plate with deionized water until the surface thereof becomes neutral; further soaking the negative plate in boric acid- salicylic acid impregnation liquid for more than 20 minutes while heating, and keeping temperature of the boric acid-salicylic acid impregnation liquid to be 60-80 DEG C during the soaking process; then, taking out and baking the negative plate to completely remove water on the surface thereof; and finally, taking down a lead paste from the dried negative plate, grinding the lead paste into powder, and carrying out qualitative and quantitative analysis on constituents of the negative plate through an XRD(X-Ray Diffraction)-Rietveld method. According to the invention, firstly, the old negative plate drawn out from the battery is pretreated, a protective layer is formed on the surface of the negative plate, oxidization of lead of the negative plate is avoided effectively and residual of sulfuric acid on the surface of the negative plate is removed, as a result, the negative plate can be dried directly by a normal drying method, and the qualitative and quantitative analysis method is high in testing accuracy, convenient and simple, low-cost and pollution-free.

Description

technical field [0001] The invention relates to the field of component analysis of lead-acid batteries, in particular to a qualitative and quantitative analysis method for old negative plates of lead-acid batteries. Background technique [0002] The active material composition and the content of each component of the lead-acid battery plate have a great influence on the performance of the battery, and by analyzing the changes in the composition of the plate and the content of each component, it is possible to explore the relationship between battery performance and various phases and determine the cause of battery failure. , can play a very good guiding role in the improvement of battery performance, so it is extremely important to analyze the composition of the plate. The general chemical analysis method is time-consuming, and can only give the content of known phases, but cannot analyze and test unknown phases, so this method limits its application in phase composition ana...

AI Technical Summary

Problems solved by technology

The general chemical analysis method is time-consuming, and can only give the content of known phases, but cannot analyze and test unknown phases, so this method limits its application in phase composition analysis, and XRD diffraction technology It has the advantages of simple operation, relatively high accuracy and fast test speed, and can be widely used in battery plate analysis

However, the negative plate of the lead-acid battery is easy to oxidize, and the sulfuric acid on the surface is not completely removed, which leads to the formation of other phases (PbO, 3BS) during the drying process, which inevitably leads to inaccurate test results obtained by chemical analysis methods and other methods.

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