Testing method for dispersion uniformity of additives in lead-acid battery negative lead paste

Abstract

The method for detecting the dispersion uniformity of additives in lead-acid battery negative lead paste, including the following steps: sample preparation; sample test: using thermogravimetric-differential scanning calorimetry (TG / DSC) synchronous thermal analyzer to detect the prepared samples respectively The DSC curve of the additive; the determination of the exothermic peak of the additive: through the DSC test of the additive, the DSC test of the blank control experiment of the positive raw board, the DSC test of the secondary heating of the negative raw board lead paste and the TG / DSC test, the obtained DSC curve and the measured The DSC curve of the negative raw board lead paste is compared and analyzed to determine the exothermic peak of the additive; the determined exothermic peak of the additive is normalized and integrated using the same integral curve to obtain the heat release of the additive in the lead paste per unit weight; Use mathematical tools to calculate the standard deviation S and dispersion R, and finally obtain the uniformity H of the lead paste additive; determine the best paste process. The invention can quickly and accurately measure the dispersion uniformity of the additive in the lead paste.

Description

technical field [0001] The invention relates to a method for detecting the dispersion uniformity of additives in lead paste, in particular to a method for detecting the dispersion uniformity of additives in negative lead paste, which belongs to the technical field of storage batteries. Background technique [0002] Lead paste manufacturing is an important process in the production of lead-acid batteries, which has an important impact on battery production. The main components of negative lead paste are lead powder, acid, water, and additives. The main components of negative lead paste additives include fiber, barium sulfate, lignin, humic acid, carbon black, etc. The proportion of these additives in the lead paste It is very small, all in the range of 0%-2%, but it plays a decisive role in the main performance capacity, low temperature discharge, cycle durability and other performance of the battery. For example: the role of fibers in battery plates is to resist shrinkage, ...

AI Technical Summary

Problems solved by technology

The method of detecting the uniformity of a component in the additive cannot detect the distribution of the overall additive, and there is an error in the identification of the uniformity of the lead paste

In addition, most of the additives are polymer mixtures with complex components. In the process of testing the uniformity of lead paste, the detection method is complicated and time-consuming

The method of using inorganic salt ions to detect the uniformity of lead paste will introduce new impurities that are not conducive to battery performance and affect the quality of lead paste

In addition, lignin, humic acid, fiber, and carbon black have different particle size distribution, shape, apparent density, electrostatic charge, fluidity, and agglomeration, resulting in great differences in their dispersibility in lead paste, so Indirect detection of inorganic salt ions or a single component content in the additive to assess the dispersion uniformity of the additive in the lead paste has certain errors, and the uniformity of the lead paste cannot be accurately judged

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