JPS6135664B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved method for manufacturing electrode plates for lead-acid batteries.

Conventionally, in order to improve the lifespan of the positive electrode plate, an active material is filled in a base that integrates a lead lattice body and a synthetic resin body, and a mat body is brought into contact with the front and back surfaces of the pole plate, and the synthetic resin body and the mat body are bonded together. A method for manufacturing positive electrode plates for lead-acid batteries has been proposed that involves thermal welding. It is thought that any thermoplastic synthetic resin that is acid- and oxidation-resistant can be used as the synthetic resin body that is part of the base of the electrode plate; When using synthetic resin such as polypropylene, which is vulnerable to oxygen atmosphere due to the presence of dissolved oxygen in the atmosphere and the presence of dissolved oxygen in the battery, the welding strength of the heat welded part will be reduced and it may be attracted and peeled off. As expected, the effect of improving the life of the positive electrode plate will be small. In addition, woven glass cloth is considered to be effective as a material for the mat body in terms of strength, but
As a binder for the glass woven fabric, phenolic resin has usually been used as in conventional tubes for clad type electrode plates. When finol resin is used as a binder for a glass woven mat body, the state of heat welding between the synthetic resin body and the mat body, which is a part of the base body, is not essentially a heat welded state, but a state of heat welding between the synthetic resin body and the mat body, which is a part of the base body. Since only a portion of the melt is entangled with the mat body, it has the disadvantage that the welding strength is reduced.

The present invention eliminates the above-mentioned drawbacks and greatly extends the life of the electrode plate.

Next, one embodiment of the present invention will be described.

In addition to having great rigidity, which is an advantage of phenol resin-impregnated glass woven fabric, the synthetic resin body 1 and matte body 2 are thermally welded to increase welding strength.
As for the binder, the welded portion between the synthetic resin body 1 and the mat body 2 is made of the same material as the synthetic resin body 1, and a synthetic resin having a softening point lower than that of the material of the mat body, such as a polyethylene resin emulsion or dispersion liquid, is used. After drying, the mat body 2 was impregnated with a phenolic resin and heat treated.

In this case, since the welded part of the synthetic resin body 1 and the mat body 2 is impregnated with polyethylene resin in advance, if the phenol resin is subsequently impregnated, the phenol resin will not be impregnated into the part impregnated with the polyethylene resin. Only other parts are impregnated with phenolic resin.

Therefore, the mat body 2 according to the invention has great rigidity, which is an advantage of the phenolic resin-impregnated glass fabric. Furthermore, since there is a synthetic resin of the same material as the synthetic resin body 1, which covers the entire fibers of the mat body 2 and is concentrated at the intersections of the fiber bodies, the flow and adhesion of the synthetic resin during heat welding are improved. As a result, the welding strength between the mat body 2 and the synthetic resin body 1 is significantly improved.

Note that 3 is a polyethylene resin-impregnated part of the mat body 2, 4 is a phenol resin-impregnated part of the mat body 2, and 5 is a polyethylene resin-impregnated part of the mat body 2.
is a positive electrode active material, and 6 is a lead lattice body.

The electrode plate obtained by the present invention has great rigidity, which is an advantage of phenolic resin-impregnated glass fabric,
Furthermore, the welding strength between the synthetic resin body 1, which is a part of the base body, and the mat body 2 was significantly increased, and the life of the positive electrode plate was extended.

That is, the electrode plate obtained by the present invention has a lifespan more than twice as long as that of a conventional electrode plate that uses a synthetic resin body made of polypropylene and uses a phenolic resin as a binder for the mat body. Ta.

As mentioned above, the present invention has great industrial value, as it can greatly extend the life of the electrode plate.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of the electrode plate according to the present invention;
FIG. 2 is a sectional view taken along line AA' in FIG. 1. 1 is a synthetic resin body, 2 is a matte body, 3 is a polyethylene resin impregnated part, 4 is a phenol resin impregnated part, 5
is a positive electrode active material, and 6 is a lead lattice body.

Claims (1)

[Claims] 1. A method for producing electrode plates for lead-acid batteries, in which the mat members are brought into contact with the front and back surfaces of the electrode plate, which is made by integrating a lead lattice member and a synthetic resin member and filled with an active material, and the synthetic resin member and the mat member are thermally welded. In this method, the welded part between the synthetic resin body and the pine body is made of the same material as the synthetic resin body and is impregnated with a synthetic resin having a softening point lower than that of the material of the pine body, and the other parts are made of pine impregnated with phenolic resin. A method for producing electrode plates for lead-acid batteries, which uses a lead-acid battery.