A rapid high-temperature curing and drying process for raw plates of lead-acid batteries

Abstract

The invention discloses a rapid high-temperature curing drying process of a lead-acid storage battery unformed electrode plate. The process comprises the following steps of curing the unformed electrode plate which is coated with lead plaste in a curing chamber with the humidity of 95 to 99 percent and the temperature of 47 to 50 DEG C for 3 to 5h; increasing the indoor temperature in the curing chamber to 83 to 86 DEG C within 2 to 4h, curing the unformed electrode plate for 15 to 20h under the condition that the indoor temperature is 83 to 86 DEG C and the humidity is 97 to 99 percent, and reducing the temperature inside the curing chamber to 60 to 65 DEG C, and reducing the humidity to 90 to 95 percent; maintaining the temperature in the curing chamber to 60 to 65 DEG C, reducing the humidity to 80 to 85 percent, and curing the unformed electrode plate for 5 to 7h; increasing the temperature in the curing chamber to 86 to 88 DEG C within 2 to 4h, and reducing the humidity to 0 to 10 percent; maintaining the temperature in the curing chamber to 86 to 88 DEG C, controlling the humidity to 0, and drying the unformed electrode plate for 10 to 12h under the high temperature. The process is short in curing drying time, the curing drying time is shortened for 20h compared with that in an existing process, not only can an existing curing drying device be utilized, but also the curing drying time can be shortened under the condition that the investment is not increased, the production efficiency is improved, and the service life of the storage battery is prolonged.

Description

technical field [0001] The invention relates to the field of lead-acid storage battery manufacturing, in particular to a rapid high-temperature curing and drying process for a raw plate of a lead-acid storage battery. Background technique [0002] With the widespread use of electric mopeds, electric vehicles, and portable electric tools in recent years, as well as the continuous construction of communication base stations and wind-solar hybrid power stations, valve-regulated sealed lead-acid batteries are characterized by their stable and reliable reversibility and safety, as well as their low cost. The price and high cost performance have been widely used. In order to meet the extensive needs of the market and customers, it is necessary to manufacture long-life valve-regulated sealed batteries to improve product quality. [0003] The softening of the active material of the positive plate of the lead-acid battery and the poor combination of the lead paste and the grid surf...

AI Technical Summary

Problems solved by technology

[0003] The softening of the active material of the positive plate of the lead-acid battery and the poor combination of the lead paste and the grid surface will affect the service life of the battery. Although adding some additives can delay the softening of the active material and improve the binding degree of the lead paste and the grid surface, but The effects of these auxiliary measures are not obvious. To prolong and improve the cycle life of valve-regulated lead-acid batteries, the key is to improve the curing and drying effect of the raw plate during the battery manufacturing process, so as to ensure that the lead paste and the grid are tightly bonded after formation. , to slow down the softening of the positive plate active material

The existing curing and drying processes are usually divided into two types: one is curing and drying under high temperature and high pressure. After curing, the thick corrosion layer on the surface of the grid provides good adhesion for the lead plaster skeleton, so that the lead paste can be combined with the surface of the grid. compact, but the existing curing chamber system cannot meet the reaction conditions of high temperature and high pressure, and it needs to be reacted in a special pressure curing chamber system, so the application range of this process is greatly limited, which is not conducive to promotion; another process is Use the existing curing room system to operate under normal pressure, usually at an environment below 76°C. This curing process takes at least 50 hours to complete. The curing time is long and the efficiency is low. The plate is free-falling 6 times at a height of one meter. The final powder loss is above 0.85%, the strength is not high, and after the plate is cured and dried, the lead paste is mostly 3PbO·PbSO 4 ·H 2 O form exists, and this form is formed when α-PbO 2 The conversion rate of α-PbO is low 2 / β-PbO 2 The ratio of 0.12~0.31, the active material of the finished positive plate is easy to soften; in addition, due to the low curing temperature, the oxidation rate of the grid surface is slow, and the surface corrosion layer is only 100~116 μm, resulting in the lead paste and grid surface Poor combination

In summary, the overall effect of the existing curing and drying process under normal pressure is poor, and the service life of the battery is short