Alloy material for accumulator positive slab lattice and preparation method thereof

Abstract

The invention discloses an alloy material for a positive slab lattice of a lead acid storage battery and a preparation method thereof. The alloy material is composed of 0.07 percent to 0.12 percent of calcium, 0.10 percent to 0.12 percent of tin, 0.04 percent to 0.05 percent of aluminum, 0.16 percent to 0.2 percent of cerium or lanthanum and the balance of lead. The preparation method comprises the following steps: a. the lead is melted to form a lead solution; b. the temperature of the lead solution is controlled between 600 DEG C and 650 DEG C and the cerium or the lanthanum is added into the solution; and c. the temperature of the lead solution is lowered to 550 DEG C to 580 DEG C and the calcium and the aluminum are added into the solution; and d. the temperature of the lead solution is lowered to 450 DEG C to 500 DEG C, the tin is added into the solution, and the lead solution is taken out from the pot and molded into the alloy material. The alloy material prepared by the method has good corrosion resistant performance and can ensure that the lead acid storage battery produced has good corrosion resistant performance, low water loss, low gassing rate and long service life.

Description

technical field [0001] The invention relates to a storage battery, in particular to an alloy material of a storage battery positive grid and a preparation method thereof. Background technique [0002] The power source of electric vehicles and hybrid electric vehicles generally uses sealed valve-regulated lead-acid batteries, and the positive grid materials of lead-acid batteries are mostly lead-based seven-element alloys or lead-calcium alloys. The composition of the lead-based seven-element alloy is Pb-Sb-As-Sn-Se-Cu-S, and the use of antimony-containing lead-based seven-element alloy material can solve the problem of weak corrosion resistance of the battery grid, so that the battery has better Deep charging and deep discharging capabilities. However, during the use of the positive grid made of lead-based seven-element alloy, antimony is replaced by Sb 3+ Ions exist in the form of ions, which are easy to migrate between the separators and deposit on the surface of the neg...

AI Technical Summary

Problems solved by technology

However, during the use of the positive grid made of lead-based seven-element alloy, antimony is replaced by Sb 3+ Ions exist in the form of ions, which are easy to migrate between the separators and deposit on the surface of the negative electrode, thereby reducing the hydrogen evolution overpotential on the negative electrode, making the battery very easy to degas and lose water when it is charged or overcharged. In order to maintain the battery, it needs to be in use Add water frequently, otherwise it will cause the battery to dry up prematurely and end its life

[0003] The composition of the lead-calcium alloy is Pb-Ca-Sn-A1. This alloy achieves the purpose of reducing the water loss of the battery. The gas loss and water loss are small. The battery does not need to be maintained with water, but the corrosion resistance is not strong. During the charging process, the battery The surface of the positive grid of the lead-calcium alloy material is very easy to grow a layer of high-resistance anodic corrosion layer and severe intergranular corrosion

Therefore, the deep charge and deep discharge performance of the battery is greatly affected, and the service life of the battery is reduced. When used as a power source for electric vehicles and hybrid electric vehicles, the service life is less than 6 months, and it is difficult to meet the needs of users.