JP2002203563A - Method for manufacturing electrode board for lead storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing an electrode board for lead storage battery which can manufacture efficiently the lead storage battery that has stabilized quality in which an active material does not mixed in a battery box. SOLUTION: The method for manufacturing the electrode board for the lead storage batteries constituted that two or more sheets of a lattice body made from lead or a lead alloy, which consists of a lattice, a frame skeleton, and an ear part, are joined at a joint part and formed in integration, and a unit electrode board is produced by cutting the joint part, after filling up the above lattice portion with an active material from one side face. The method is characterized by that at least the face of the joint part where the active material is filled from is formed in the same frat plane with the frame skeleton face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electrode plate for a lead storage battery, and more particularly to a method for manufacturing a multi-plate electrode.

[0002]

2. Description of the Related Art A lead or lead alloy lattice composed of a large number of lattices, frame bones and ears constituting an electrode plate for a lead storage battery is equivalent to a plurality of unit lattices composed of a lattice, frame bones and ears. The unit lattices are integrally formed by a book mold casting method in which a fixed mold and a movable mold are brought into contact with each other and hot water is poured into a gap between the fixed and movable molds so that the unit lattices are connected at a connection portion. It is manufactured by a book mold casting method in which a material is filled from one side, and then a connection portion is cut and cut into unit electrode plates. In order to improve the flow of molten metal between the upper grid and the lower grid in order to integrally mold a large number of unit electrode plates, the connecting portion connecting the upper and lower unit electrode plates should be thickened. The flow of hot water has been improved. However, on the other hand, the connecting portion is not used as an electrode plate but is cut and removed, so that it is sufficient that the connecting portion has strength enough to withstand handling in a manufacturing process, and a mold or the like is designed in a direction to save material as much as possible. .

Therefore, the conventional connecting portion in the book mold casting method requires a connecting portion 31 as shown in FIG. 2 to improve the flow of molten metal from the upper grid to the lower grid. Are thick, and the portions that do not require much flow of hot water are configured to have irregularities on the front and back surfaces so as to be thin. When the concavo-convex portion is formed in the connecting portion 31 as described above, a peak portion 33 and a valley portion 32 are formed on the front and back surfaces of the connecting portion 31. In addition, a technique has been proposed in which the connecting portion is formed by a connecting portion thinner than the frame bone (for example, Japanese Patent Publication No. 7-6-7).
No. 0683).

[0004]

As described above, in the conventional connecting portion 31, the connecting portion 31 itself has a peak portion 33 and a valley portion 32, or the unevenness between the connecting portion 31 and the frame bone 34. Alternatively, when the active material is filled in the interstitial portions 36 of a large number of continuous unit lattices due to the structure having the step 35, the active material also fills the valley 32 of the connecting portion 31 or the step 35. Is done. Since the connecting portion 31 filled with the active material is cut and removed in a subsequent step, the connecting portion 31 is removed.
There is no problem even if the active material is filled. However, the active material filled in the valley 32 or the step 35 of the connecting portion 31 may not be sufficiently removed when the connecting portion is removed. The plates are laminated via a separator (retainer mat),
If it enters the separator or the like in the process of forming the electrode group and is stored in the battery case in that state, it may cause a short circuit accident. The present invention is a method for manufacturing a lead-acid battery electrode plate that prevents such a conventional short-circuit accident beforehand and provides a high-quality lead-acid battery.

[0005]

As a means for solving the above-mentioned problems, the present invention relates to a method for connecting a plurality of lead or lead alloy lattices consisting of a lattice, a frame bone and an ear by connecting them with a connecting part. In a method for manufacturing a lead-acid battery electrode plate, which is integrally molded and the grid portion is filled with an active material from one surface and then cuts a connection portion to form a unit electrode plate, at least the active material of the connection portion is filled. The surface to be formed is flush with the frame bone and is formed as a smooth surface.

According to the present invention, the surface of the connecting portion connecting the unit lattices, which is filled with the active material, has a smooth surface, and the connecting portion has no irregularities or recesses or steps between itself and the frame bone. As a result, the active material is not filled in the connecting portion, and therefore, the active material enters the separator and the like in the cutting and removing of the connecting portion and in a subsequent process, and enters the battery case to cause a short circuit accident. There is nothing like that.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1A is a plan view showing an embodiment of the present invention, and FIG. 1B is an enlarged sectional view showing a connecting portion, wherein 1 is a unit lattice body, and the unit lattice body 1 is a frame bone 3; It consists of a grid 4 and ears 5. Reference numeral 2 denotes a connecting portion for connecting the unit lattice bodies 1 to each other. As shown in an enlarged manner in FIG. 1B, the connecting portion 2 has one surface 11 which is flush with the surface of the frame bone 3 and the whole thereof. It is formed in a plane, and the lower surface 12 is an uneven surface in consideration of the molten metal flow. Reference numeral 7 denotes a suspension projection for handling the multiple unit lattices 1 connected in the manufacturing process. The multi-unit connected unit lattice 1 thus formed is passed under the active material filling device to form a space 6 between the lattices 4 of the multi-unit connected unit lattice 1 from the smooth surface 11 side of the connection unit 2. Continuous filling of paste-like active material,
After drying, each connecting portion 2 is cut to form a unit electrode plate.

Thus, the interstitial space 6 of the lattice body 1
Even if the active material is continuously filled, the active material filling surface 11 of the connecting portion 2, that is, the smooth surface 11 of the connecting portion has no irregularities, so that the active material does not enter the connecting portion 2. Therefore, the active material does not enter the separator or the like in the process after cutting and removing the connecting portion 2, and an accident such as a short circuit between the electrodes does not occur.

EXAMPLE A grid body 1 having the structure shown in FIG. 1 was trial-produced by book mold casting using 12 pieces of lead alloy. A smooth surface 11 is added to the twelve connected grids 1 by an active material continuous filling apparatus.
The active material is filled so that the thickness becomes the same as the thickness of the lattice body 1 from the side, and after the suspension, the suspension projections 7 and the connecting portions 2 are cut and removed.
The central part of the ears 5 connected to each other was cut to obtain a unit electrode plate. Using this electrode plate, an electrode group was formed via a separator between the electrode plates, and was housed in a battery case to produce a storage battery. 100 prototype batteries were produced, and none of them produced any short circuit due to the active material in the short circuit test in the manufacturing process.

Comparative Example An electrode plate was formed in the same manner as in the embodiment except that the connecting portion for connecting the lattice members was the structure of the connecting portion 31 shown in FIG. 2, and 100 storage batteries were assembled. In the short-circuit test, 5 short-circuits occurred due to the active material, and the quality was uneven.

[0011]

As described above, according to the present invention, the active material-filled side surface of the connecting portion 2 connecting the unit lattice bodies 1 is smoothed.
In addition, there is no unevenness on the side where the active material is filled in the connecting surface by making it flush with the bone frame 3, and there is no room for the active material to enter the connecting portion 2, so that the active material remains in the connecting portion 2. Therefore, the active material does not enter the separator or the like in the process after cutting and removing the connecting portion 2, and an accident such as a short circuit between the electrodes does not occur. Therefore,
It has an excellent effect of efficiently producing a lead storage battery of excellent quality.

[Brief description of the drawings]

FIG. 1A is a plan view showing an embodiment of a grid connected by a connecting portion according to the present invention, and FIG. 1B is an enlarged explanatory view of the connecting portion.

FIG. 2 is an enlarged explanatory view showing a conventional connecting portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Unit lattice body 2 Connecting part 3 Frame bone 4 Lattice 5 Ear 6 Interstitial space 11 Upper surface (smooth surface) 12 Lower surface

Claims (1)

[Claims] 1. A lead or lead alloy lattice body composed of a lattice, a frame bone, and an ear portion, which are connected to each other by a connecting portion and integrally molded, and the lattice portion is filled with an active material from one surface. Thereafter, in the method for manufacturing a lead-acid battery electrode plate in which a connection portion is cut to form a unit electrode plate, at least the surface of the connection portion filled with the active material is formed to be flush with the frame bone and to be a smooth surface. A method for producing an electrode plate for a lead-acid battery, comprising: