Alloy for positive grid of lead-acid storage battery, preparation method of alloy and positive grid

By adopting a new alloy for positive plate grids of lead-acid batteries, the components include Sn, Al, Bi, V and modified fibers, and using waste batteries to recover lead directly as raw materials, the problem of easy formation of passivation film and high temperature corrosion rate on the surface of the grid alloy in the prior art is solved, and the effects of high corrosion resistance, low cost and high recycling and decompression efficiency are achieved.

CN119710498APending Publication Date: 2025-03-28HUBEI HONGBEN ENERGY CO LTD
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Patent Information

Application Number
CN202411969874.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing lead-acid battery plate-grid alloy is prone to form a passivation film on the surface during charging and discharging, which hinders the normal charging and discharging of the battery and affects the cycle life of the battery. At the same time, calcium increases the corrosion rate of the alloy at high temperatures, and it is difficult to remove impurities in lead recovery and is costly.

Method used

A new alloy for positive electrode grid of lead-acid battery is adopted, with components including Sn0.1-0.5 wt%, Al0.005-0.25 wt%, Bi 0.5-2.7 wt%, V 0.01-0.08 wt%, modified glass fibers and modified ceramic fibers. The alloy is prepared by a specific smelting process, and lead is recovered using waste batteries as a raw material, avoiding the separate dilution or removal steps of Bi.

Benefits of technology

It improves the corrosion resistance, tensile strength and cycle life of lead alloys, reduces the cost of alloys, significantly improves the impurity removal efficiency of lead recycling, and enhances the high-temperature service life and market competitiveness of the battery.

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Abstract

The invention relates to an alloy for a positive grid of a lead-acid storage battery. The alloy consists of the following components: 0.1 to 0.5 weight percent of Sn, 0.005 to 0.25 weight percent of Al, 0.5 to 2.7 weight percent of Bi, 0.01 to 0.08 weight percent of V, 0.01 to 0.05 weight percent of modified glass fiber, 0.01 to 0.05 weight percent of modified ceramic fiber, less than or equal to 0.002 weight percent of impurities and the balance of Pb. According to the method, Ca is not added, so that the influence of a surface passive film in the charging and discharging process is effectively prevented, meanwhile, the corrosion rate is reduced, Sn is replaced with Bi, the corrosion resistance of the alloy is improved, the conductivity of a corrosion layer is improved, the use amount of Sn is greatly reduced, the cost is remarkably reduced, meanwhile, high-Bi-content recycled lead recycled from waste batteries is directly used without independently diluting Bi or removing Bi, and the cost is reduced. The impurity removal efficiency of the recovered lead is improved; v increases the strength, hardness and ductility of the alloy, and the modified glass fibers and ceramic fibers increase the surface roughness and enhance the binding force with lead liquid, so that the tensile strength of the alloy can be remarkably improved; the invention solves the problems of poor corrosion resistance of lead-calcium alloy, easy growth of grid, interfacial effect capacity loss and the like, and prolongs the high-temperature service life of the storage battery.
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