JPH04155758A - Method for manufacturing electrode plates for lead-acid batteries - Google Patents

Abstract

PURPOSE:To improve the size accuracy of a lug part by punching the lug part of a panel grating body comprising cast grating body or at least two grating bodies at normal height and width by pressing. CONSTITUTION:A solid film 2 of a width h2 that is larger than a height h1 of a portion that will be a lug part 1, is provided and cast on the upper part of a grating body of 64mm at height, 40mm in width, and 3.4mm in thickness, and an active material paste is filled therein, and after aging and baking process are carried out, the solid film 2 is punched by a press in such a way that the lug part 1 is of the shape of 10mm in height, and 4mm in width, and a positive plate is thus formed. In the same manner, a negative plate of 64mm at height, 40mm in width, and 2.0mm in thickness, is formed. A separator made of glass fiber is arranged between the positive plate and the negative plate, and after a plate group is formed, plasma welding is applied, and by using lead, the lug parts 8 of the same polarity are welded together, and a shelf is thus formed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing electrode plates for lead-acid batteries, and more particularly to a method for improving the dimensional accuracy of the ears of a grid.

BACKGROUND OF THE INVENTION Plate plates for lead-acid batteries are generally manufactured by filling a substrate called a grid with an active material paste. At this time, the active material is applied to one grid body cast with regular ear dimensions or a panel grid body consisting of two or more grid bodies whose ears are cast with regular dimensions. Fill with paste. This panel grid body is then cut into individual plates using a bunt saw or the like.

Problems to be Solved by the Invention However, with this method, during casting, a taper is required in the cross section in order to remove the mold from the mold. During the assembly process of the electrode plate, due to variations in the beam during casting and the dimensions cut by the bundt saw afterwards, when welding the ears 5 together to form the shelf, it may be difficult to enter the welding pin 4, or the ears may be difficult to enter. Due to large variations in the height or width dimensions of 5, welding became uneven, resulting in frequent welding defects.

Because the ear portion 5 has a cross-sectional shape as shown in Fig. 2 (b) for being removed from a beam or mold, the ear portion 5 does not fit firmly into the welding fork 4, and is stuck between the welding forge 4 and the cover plate 7. 2: A gap 9 is created, and the molten lead flows out from this gap 9, resulting in a casting burr 6.
This lead drip caused a short circuit between the positive electrode plate and the negative electrode plate due to the Z casting burr 6.

The present invention solves these problems, and improves the dimensional accuracy of the ear portion without being affected by the cutting method used after preparing the burr, such as using a bunt saw, thereby stabilizing the quality of lead-acid batteries and increasing productivity. The purpose is to improve

Means for Solving the Problems In order to solve the above-mentioned problems, the method for manufacturing a lead-acid battery plate according to the present invention provides a method for manufacturing a lead-acid battery electrode plate using a cast lattice body or a panel lattice body consisting of two or more of the above-mentioned lattice bodies. The height and width are punched out using a press to the standard dimensions.

Effect: With this configuration, the method for manufacturing a lead-acid battery plate of the present invention is as follows:
A cast lattice body having ears larger than the standard dimensions of the ears of the electrode plate or a panel lattice body consisting of two or more of the above-mentioned lattice bodies is pressed to the standard height and width. By punching, the ears of the electrode plate can be formed with good dimensional accuracy.

Example i Hereinafter, a method for manufacturing a lead-acid battery electrode plate according to an example of the present invention will be described with reference to the drawings.

In FIG. 1, a solid membrane 2 having a radius h2 larger than the height h1 of the portion that will become the ear portion 1 is provided on the top of a lattice body having a height of 64 m, a radius of 40 m, and a thickness of 3.4 m, and is cast. Next, after filling the active material paste and completing the aging and drying process, the solid film 2 is formed so that the shape of the ear part 1 is 10 wa in height and the diameter is 41.
A positive electrode plate was created by punching out the material using a press to obtain a size of 111. In addition, using the same method, a
．． A 0+nm negative electrode plate was created. Then, after placing a separator made of glass fiber between the positive electrode plate and the negative electrode plate to form a group of electrode plates, as shown in FIG. Welded and formed a shelf. At this time, for comparison, an electrode plate was created using a conventional grid body as shown in FIG. 2, and a shelf was formed in the same manner. 1000 cells of each of the product of this example and the conventional product were welded, and the occurrence of welding defects and lead droop was investigated. The results are shown in Table 1.

In the conventional product shown in Table 1, welding defects occurred in 1.9% and 3.2% due to lead, whereas in this example product, as shown in Fig. There were almost no gaps, and there were almost no welding defects or lead leaks. This result is
Including the beam, the variation in the height of the ear part 8 is about 10±1m for the conventional product, while it is about 10±0.3mm for the product of this example, and the variation in width for the conventional product is about 4mm. ±
For 1 m, the product of this example is about 4 ± 0.1 + s,
This effect is due to the significantly reduced variation in the dimensions of the ears. This variation in the dimensions of the ears becomes even greater during the process of cutting each plate into individual plates when creating electrode plates from a panel grid consisting of two or more grid bodies. Therefore, the effect will be even greater.

In this example, the portion that will become the ear is made of the solid film 2 shown in Figure 1, but even if it has the same shape as in Figure 2, the ear is cast to a size larger than the standard size and then pressed. It is clear that the same effect can be obtained even if the ear is punched out and formed into the regular ear size.

As is clear from the explanation of actual examples above, the method of manufacturing electrode plates for lead-acid batteries of the present invention significantly improves the reliability and productivity of welding work, and significantly reduces welding defects and lead dripping. By reducing the amount, the quality of lead-acid batteries can be stabilized and productivity can be improved.

[Brief explanation of drawings]

FIG. 1 is a front view showing the concept of the electrode plate in the method for manufacturing electrode plates for lead-acid batteries according to an embodiment of the present invention, FIG. 2(a) is a front view showing the concept of the conventional electrode plate, and FIG. 2(b) is AA' in (a)
FIG. 3 is a cross-sectional view of the ear part showing a cross section, and FIG. FIG. 4 is a side view showing the main parts of a conventional electrode plate set on a welding spool and welded. l, 8... ear, 2... solid membrane. Name of agent: Patent attorney Haruaki Koebi and 2 others
Signs

Claims (2)

[Claims] (1) A method for producing an electrode plate for a lead-acid battery, in which the ears of a cast grid body or a panel grid body made of two or more of the above grid bodies are punched out to regular dimensions in height and width using a press. (2) In a panel lattice body consisting of a lattice body or a plurality of lattice bodies of two or more, each portion of the lattice body that becomes an ear portion is a continuous solid piece with a width equal to or greater than the regular height dimension of the ear portion. 2. The method of manufacturing a lead-acid battery plate according to claim 1, wherein a membrane is formed, or the panel lattice body has ears whose height and width are larger than the normal height and width of each ear of the lattice body. .