A positive electrode grid and its preparation method

Abstract

The invention discloses a positive electrode grid and a preparation method thereof. Ag, 0.02‑0.04% Na, balance Pb. The advantages of the present invention are: Sn and its oxide formed with lead are good conductors, which can improve the conductivity of the contact layer; Ca can increase the strength of lead, and Ag and lead have better phase solubility, which can improve the corrosion resistance of the alloy Na can remove harmful impurities such as Cu and Sb in the alloy; Al has a low density and is distributed on the upper layer of the alloy, which can effectively protect other main components and avoid burning; the release agent can effectively improve the bonding force between the grid and the lead paste; high temperature Age hardening can eliminate lattice defects, improve the strength of the grid, and at the same time refine the grid grains, improve corrosion resistance and creep resistance; the battery prepared with it has small internal resistance and long deep cycle life, effectively avoiding solve the problem of initial capacity fading.

Description

technical field [0001] The invention relates to the field of battery production technology, in particular to a positive electrode grid and a preparation method thereof. Background technique [0002] With the rapid development of electric bicycles, low-speed electric vehicles, electric sightseeing vehicles, electric sweepers and electric tools, the demand for power batteries is increasing, and the requirements for battery performance are also increasing. At the same time, as the country banned the production of cadmium-containing batteries and externally formed batteries, all power batteries have been adjusted to cadmium-free internally formed production processes in recent years. After the internally formed batteries were introduced to the market, it was found that the batteries were under high-current charging and discharging and deep cycle use. The phenomenon of initial capacity attenuation (that is, a sudden and sharp drop in capacity) is easy to occur, and the experience...

AI Technical Summary

Problems solved by technology

At the same time, as the country banned the production of cadmium-containing batteries and externally formed batteries, all power batteries have been adjusted to cadmium-free internally formed production processes in recent years. After the internally formed batteries were introduced to the market, it was found that the batteries were under high-current charging and discharging and deep cycle use. It is prone to the phenomenon of initial capacity attenuation (that is, the sudden and sharp drop in capacity), which will cause poor experience for consumers and bring huge losses to manufacturers

Through analysis, it is found that the battery with this phenomenon has a relatively large internal resistance, especially the internal resistance of the positive plate will suddenly increase in the late stage of discharge / charge, resulting in the battery not being able to discharge or charge.