Positive slab lattice alloy for power lead acid battery and preparation method thereof

Abstract

The invention relates to an alloy material for a positive slab lattice of a dynamical lead acid storage battery and a preparation method thereof and relates to the manufacturing technical field of the alloy for the positive slab lattice of the dynamical lead acid storage battery. A rare earth metal is coated with lead foils for sealing, powders of calcium, strontium and aluminum are mixed in proportion and pressed into an alloy metal pie; electrolytic lead with the volume of 80 percent of that of a lead melting kettle is measured and heated until the electrolytic lead is melted down; the rare earth metal coated with the lead foils and the alloy metal pie are pressed into the bottom of the lead melting kettle and melted down; tin and bismuth are added when the lead skim is taken out and the mixture produced is evenly stirred; and finally the materials are formed and molded into ingots. As the rare earth composition is added, the alloy material provided by the invention lowers the content of calcium and tin in prior lead-calcium-tin-aluminium quaternary alloy, lowers the content of calcium to enhance the corrosion resistant performance of the slab lattice as well as the content of tin to save the cost, increases the rare earth composition to enhance the corrosion resistant performance, the castability and the mechanical strength of the slab lattice and strengthens the binding force of active materials and the slab lattice to eliminate the influence of 'antimony-free effect'.

Description

technical field [0001] The invention relates to the technical field of production of alloys for positive grids of power-type lead-acid batteries. Background technique [0002] Commonly used power battery positive grid material alloys include lead-calcium-tin-aluminum alloy and lead-antimony-cadmium alloy. The positive grid made of lead-calcium-tin-aluminum quaternary alloy is likely to cause poor bonding between the grid and the active material and poor electrical conductivity due to the corrosion layer on the grid surface during the solidification process of the plate, which is harmful to the deep cycle discharge and discharge of the power battery. The final charging is extremely unfavorable. Generally, if the curing control of lead-calcium alloy is not good, the service life will not exceed six months. This is the so-called "antimony-free effect". , but there is still no guarantee that the so-called "a type of early capacity decline" and "PCL" phenomena will not occur. T...

AI Technical Summary

Problems solved by technology

The positive grid made of lead-calcium-tin-aluminum quaternary alloy is likely to cause poor bonding between the grid and the active material and poor electrical conductivity due to the corrosion layer on the grid surface during the solidification process of the plate, which is harmful to the deep cycle discharge and discharge of the power battery. The final charging is extremely unfavorable. Generally, if the curing control of lead-calcium alloy is not good, the service life will not exceed six months. This is the so-called "antimony-free effect". , but there is still no guarantee that the so-called "a type of early capacity decline" and "PCL" phenomena will not occur

The positive grid of the power battery made of lead-antimony-cadmium alloy can adapt to the deep charge and discharge cycle characteristics of the battery. The grid has a strong binding force with the active material, low internal resistance, and good charging and receiving capacity, but antimony and cadmium are low due to hydrogen evolution. The battery is easy to lose water during use, which means that there are many "bulging" batteries that are not converted after charging at the end of the service life, and cadmium is a highly toxic metal, so the above two alloys are not the most ideal alloy materials for power battery grids