JPS6120112B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for manufacturing an anode plate for a lead-acid battery.

Conventional lead-acid batteries that use paste-type electrode plates have a structure in which the anode plate is placed between flat glass mats, but as the life of the anode active material progresses and the size of the anode active material becomes finer, the active material passes through the mesh of the glass mats. This caused the battery to fall off, significantly impeding battery life performance. In addition, shortening due to blistering of the anode active material and cathode active material that fell off significantly impaired battery life performance.

A clad type plate has been proposed as a plate to eliminate the above-mentioned drawbacks, but it has disadvantages such as a very complicated process and high manufacturing cost.

The present invention aims to eliminate the above-mentioned drawbacks and to provide an anode plate for a lead-acid battery that takes advantage of the advantages of a clad structure battery, simplifies the process, can be automated, and is inexpensive.

An embodiment of the present invention will be described.

A resin raw material such as vinyl chloride polypropylene, polyethylene, etc. is charged from a raw material supply hopper 1, and after melting, a paste-like resin is extruded from a screw extruder 2, and a pair of rotatable resin frame forming rolls having resin frame forming grooves on the surface is produced. A resin frame 4 as shown in FIG. 2 is formed by passing it between the molds 3, 3. After that, the resin frame 4 is heated and baked in a resin frame firing heater 5 to solidify, and then the resin frame 4 and the lead base 7 are fitted together in a lead base feeder 6, and then filled with paste-like lead oxide in a filling machine 8. An active material holding film 10 such as glass woven cloth, glass mat, synthetic resin separator, etc. is supplied to the lower part of the electrode plate by an active material holding film lower supplying machine 9.
The active material holding film 10 is attached to the upper part of the electrode plate by the active material holding film upper supplying machine 11 . Thereafter, the active material retaining film 10 and the resin frame rib 13 are thermally welded (100°C to 500°C) under pressure (5 Kg/cm ² to 50 Kg/cm ² ) by the active material retaining film thermal welding machine 12 to completely integrate them. Ru.
All these steps are carried out continuously by a belt conveyor 14.

The anode plate obtained as described above completely prevents the lead oxide from being pressurized and falling off, and since it is molded, it can be used as a base shot, side shot, etc.
It is possible to manufacture anode plates for lead-acid batteries at low cost and in large quantities, which are ideal and are comparable to closed-structure plate batteries, since there is no upper part.

FIG. 2 shows a resin frame 4 formed by a screw extruder 2 and a resin frame molding roll mold 3 and fired by a resin frame firing heater 5, and FIG. In the mold structure diagram shown, 15 is the upper mold, 16 is the lower mold, 17 is the upper mold blade, 18 is the lower mold blade, 19 is attached to the upper mold blade 17 and the lower mold blade 18. The resin elution groove 19 is a resin frame elution groove 19 in which the resin frame rib 13 is eluted from the active material holding film 10 when pressure and heat welding is performed between the upper mold 15 and the lower mold 16 to form a resin frame elution rib 20. By forming the resin frame elution ribs 20, the adhesion between the active material holding film 10 and the resin frame 4 becomes very strong, and the effect of pressurizing the lead oxide 21 and preventing it from falling off is extremely strong. This can significantly improve battery life.

The present invention has the following features.

1. According to the present invention, the process is simpler and more automated than that of conventional lead-acid batteries with a clad structure, making it possible to manufacture inexpensive lead-acid batteries, as well as making them easier to use than conventional lead-acid batteries with a paste structure. A lead-acid battery with high efficiency and long life can be obtained.

2. The lead-acid battery according to the present invention has a structure that prevents active material from falling off and shoots, so the battery life performance is 3 to 4 times longer than that of conventional paste-type lead-acid batteries.
improved twice.

3. Conventional paste-type electrode plate grids require a large amount of wasteful lead in the outer frame in order to maintain the electrode plate strength, but the electrode plate of the present invention can maintain the electrode plate strength with a resin frame. This makes it possible to effectively and significantly reduce lead consumption, and since the lead base is sufficiently pressurized with lead oxide, corrosion is reduced and the life of the lead base is significantly extended.

4. Since the strength of the electrode plates can be maintained by the resin frame, it is possible to use low antimony alloys, calcium alloys, or pure lead bases, and it is possible to manufacture lead-acid batteries with extremely low self-discharge.

5. The lead-acid battery according to the present invention is most suitable for electric vehicles, forklifts, kayaks, etc., which are used for deep charging and discharging.

6. According to the present invention, the disadvantages seen when molding a resin frame by conventional injection molding (during injection molding, turbulence occurs in the molten resin in the mold, albeit partially), Where turbulent flow occurs, the resin crystals are not aligned, which causes distortion and internal stress.The location where internal stress occurs has poor corrosion resistance, that is, oxidation resistance in the case of batteries.Also, after injection molding, If you take the grid outside the mold and leave it at room temperature, it will deform greatly depending on the temperature conditions.
For example, in the case of polyethylene resin, the length is 100
When molding resin frames, the paste-like resin extruded from a screw extruder is passed between a pair of rotating resin frame molding rolls without shrinkage of about 1 to 3 mm per mm. Since turbulence of the paste resin is less likely to occur when it is applied, there is less distortion, sufficient oxidation resistance, and less deformation in the case of polyethylene resin.
The shrinkage is only about 0.7mm for a length of 100mm,
Dimensional accuracy is also excellent. Therefore, in the process of manufacturing the anode plate, there is no need to remove or correct the deformed lattice obtained by injection molding, and continuous automation within the anode plate production line is also possible.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing the manufacturing process of the electrode plate in the present invention, Fig. 2 is a front view of a resin frame molded by a screw extruder, and Fig. 3 is taken along line A-A' in Fig. 2. 4 is a sectional view of a mold for thermally welding an active material holding film, FIG. 5 is a sectional view showing one embodiment of the electrode plate according to the present invention, and FIG. 6 is a cutaway perspective view of the same. 2 is a screw extruder, 4 is a resin frame, 5 is a resin frame firing heater, 7 is a lead base, 10 is an active material holding film, 12 is an active material holding film thermal welding machine, and 21 is a lead oxide.

Claims (1)

[Claims] 1 Paste resin extruded from a screw extruder is passed between a pair of rotating resin frame molding roll molds to form a resin frame, and after firing, the resin frame and lead base are fitted and For lead-acid batteries, characterized in that paste-like lead oxide is filled, active material retention films are brought into contact with both sides, and the active material retention films are integrated with a resin frame by pressurizing and heat welding. Method of manufacturing anode plates.