Formulation and solidifying process for anode lead plaster of long and narrow type valve controlled sealed lead acid accumulator

Abstract

A elongated valve control hermetic sealing lead-acid storage battery lead grease formulation and solidification process, wherein the percentages by weight of each ingredient in the lead grease formula are, lead powder 65-80%, red lead 8úÑí½ 20úÑ, short fibers 0.07úÑí½ 0.15úÑ, sulfuric acid 5úÑí½ 10úÑ, water 5úÑí½ 10úÑ, the high temperature and high moisture process is used for solidification, with a temperature of 70-85 degree C., and a moistness over 95%, the curing time is 20h - 30 h, the invention can guarantee both the initial capacity and the cycle life of the battery.

Description

technical field [0001] The invention relates to a formulation of a valve-controlled sealed lead-acid storage battery anode lead paste and a curing process thereof, belonging to the technical field of sealed lead-acid storage batteries. Background technique [0002] At present, the formulation and curing process of the positive electrode paste of lead-acid batteries adopts two methods, one is sandy paste made of Barton powder, which adopts high temperature and high humidity curing process; the other is viscous paste made of Shimadzu powder, which adopts Low temperature curing process. There are the following problems in these two kinds of formulations and curing process: (1) the sandy paste made of Barton powder adopts high temperature curing process, which has a long cycle life but low initial capacity; (2) the viscous paste made of Shimadzu powder adopts low temperature The curing process, just the opposite of the previous one, has a high initial capacity but a short cycle...

AI Technical Summary

Problems solved by technology

There are the following problems in these two kinds of formulations and curing process: (1) the sandy paste made of Barton powder adopts high temperature curing process, which has a long cycle life but low initial capacity; (2) the viscous paste made of Shimadzu powder adopts low temperature Curing process, just the opposite of the previous one, high initial capacity but short cycle life

Theoretical analysis has the following two reasons: (1) Barton powder is spherical and sandy paste has a high density, so the porosity is low and the reaction surface area is small. The 4BS produced by high temperature curing is not easy to convert into active substances, resulting in low initial capacity. ; and Shimadzu powder is in the form of flakes, and the density of the viscous paste is small, so the porosity is high and the reaction surface area is large. The 3BS generated by low-temperature curing is easily converted into active substances, resulting in high initial capacity; (2) 4BS generated by high-temperature curing , has the function of forming a network structure and preventing the active material from falling off, and the high-temperature and high-humidity curing is easy to form a dense corrosion layer at the interface between the grid and the active material, so that the active material and the grid are firmly combined, and the charge acceptance of the battery is improved. Resulting in long cycle life; 3BS produced by low-temperature curing cannot form a network structure, the active material is easy to fall off, and low-temperature curing is not easy to form a dense corrosion layer at the interface between the grid and the active material, making the combination of the active material and the grid weak. Poor charge acceptance of the battery, resulting in short cycle life