JPH06236753A - Strap forming method for storage battery electrode group - Google Patents

Abstract

PURPOSE:To uniform the temperature in a metal die and uniform ear part melting degree by pouring a molten lead from injection holes provided on both longitudinal ends of the metal die at the time of inserting each ear part of an electrode group into the melted lead in the metal die to form a strap. CONSTITUTION:Injection holes 9 are provided on both ends of one longitudinal side of a metal die 8. A molten lead of about 450 deg.C is sent to a gutter 6, and injected into the metal die of about 150 deg.C through the injection holes 9 until it is laid in the overflow state. Thereafter, the liquid level in the gutter 6 is lowered, whereby the liquid in the injection holes 9 is returned to the gutter 6 side, and the molten lead quantity in the metal die 8 is weighed. Ear parts 5 of an electrode plate group 1 are inserted thereto and held, their top ends are fused to the molten lead while they are partially melted, then cooled and solidified to form a strap. Since the melted lead is poured to a place having large heat release, the heat is well-balanced, the molten lead temperature in the metal die is uniformed, and a reduction in corrosion resistance by the excessive melting of the ear can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode plate group for a storage battery, in which each ear portion of the electrode plate group is inserted into the molten lead of a mold to fuse the molten lead and each ear portion to form a strap. The present invention relates to a strap forming method.

[0002]

2. Description of the Related Art Conventionally, as a method of forming a strap for a battery electrode plate group, there is a method disclosed in Japanese Patent Laid-Open No. 2-94359. As shown in FIG. 3, the electrode plate group 1 on which the strap is formed includes a cathode plate 2 and an anode plate 3 and a separator 4 as shown in FIG.
It is formed by polymerizing a required number of via. In such an electrode plate group 1, an ear portion 5 is provided so as to project for each cathode plate 2 and for each anode plate 3.

A method of forming a strap on each ear 5 of the electrode plate group 1 will be described with reference to FIGS.
A molten lead 7 is sent to the gutter 6 by a pump (not shown) as shown in FIG. 4 (a), and the molten lead 7 supplied to the gutter 6 is moved in the longitudinal direction of the mold 8 along the gutter 6 as shown in FIG. Through a spout 9 provided at the center of one side, as shown in FIGS. 4 (a) and 4 (b), it is poured into the mold 8 until an overflow state is reached. Thereafter, as shown in FIG. 4C, the liquid level of the molten lead 7 in the gutter 6 is lowered to melt the molten lead 7 in the mold 8.
Is returned from the spout 9 to the side of the gutter 6 and the liquid level of the molten lead 7 in the mold 8 is measured so that the level of the weir of the spout 9 is reached. In this state, as shown in FIGS. 4 (d) and 5, the ears 5 of the electrode plate group 1 are inserted into the molten lead 7 in the mold 8 to partially melt the tips of the ears 5. While each ear 5 and molten lead 7
Are welded, and the molten lead 7 is cooled and solidified to form a strap 10 as shown in FIG.

[0004]

However, in such a conventional strap forming method for the electrode plate group for storage batteries,
There is a spout 9 for injecting and returning the molten lead 7 in the center of one side of the die 8, and heat is supplied near the center of the die 8, while heat is supplied from around the die 8. Mold 8 to escape
There is a large temperature difference between the center of the mold and the end side.
When the ears 5 of the electrode plate group 1 are inserted into the molten lead 7 in the inside, the ears 5 in the center are melted more than the ears 5 on the end side, and each ears 5
However, there was a problem that the melting degree was uneven. in this case,
It is difficult to set the temperature condition of the molten lead 7 in the mold 8, and if the condition is adjusted to the ear 5 on the end side, the center ear 5 will be excessively melted and the length of the center ear 5 in the strap 10 will be long. Becomes shorter. The battery is corroded by the electrolytic solution penetrating along the ears 5, and if the ears 5 are short, they are corroded and cut early (corrosion resistance is lowered).

It is an object of the present invention to provide a method for forming a strap for a battery electrode plate group, which can make the temperature of molten lead in the mold uniform and make the degree of melting of the ears uniform. .

[0006]

Means for Solving the Problems To explain the means of the present invention for achieving the above-mentioned object, the present invention shows that each of the ears of a group of electrode plates obtained by polymerizing a required number of cathode plates and anode plates through a separator. In a strap forming method of an electrode plate group for a storage battery, wherein the ears and the molten lead are welded to form a strap by being inserted into the molten lead of a die, at least both ends in the longitudinal direction of the die are poured. It is characterized in that the molten lead is poured into the mold through a mouth.

[0007]

In this way, when molten lead is poured into the mold from the pouring ports at least at both ends in the longitudinal direction of the mold, the molten lead will be poured into a place where a large amount of heat is released, so that heat can be balanced. The temperature of molten lead in the mold can be made uniform. Therefore, the degree of melting of the ears can be made uniform.

[0008]

1 and 2 show an embodiment of an apparatus for carrying out the strap forming method for a battery battery electrode plate group according to the present invention. In this embodiment, the spouts 9 are provided at both ends of one side of the mold 8 in the longitudinal direction.

Next, a method for forming a strap for a battery electrode plate group of this embodiment using such a device will be described with reference to FIGS.
And it demonstrates with reference to above-mentioned FIG. 4 (a)-(d).

A molten lead 7 of about 450 ° C. is sent to the gutter 6 by a pump (not shown) as shown in FIG. 4 (a), and the molten lead 7 supplied to the gutter 6 is guided along the gutter 6 as shown in FIG. It is poured into the mold 8 at about 150 ° C. through pouring ports 9 provided at both ends of one side in the longitudinal direction of the mold 8 until an overflow state is obtained as shown in FIGS. 4 (a) and 4 (b). . afterwards,
As shown in FIG. 4 (c), the liquid level of the molten lead 7 in the gutter 6 is lowered so that the molten lead 7 in the mold 8 is poured from the spout 9 into the gutter 6.
Then, the liquid level of the molten lead 7 in the mold 8 is adjusted to the height of the weir of the pouring port 9 and measurement is performed. In this state, as shown in FIGS. 4 (d) and 2, each ear portion 5 of the electrode plate group 1 is inserted into the molten lead 7 in the mold 8 by about 4 mm, and held for about 15 votes. Each ear portion 5 and the molten lead 7 are welded while partially melting the tip of the ear portion 5, and the molten lead 7 is cooled and solidified to form a strap 10 as shown in FIG.

Strap 1 produced by the method of the present invention
As a result of observing the cross section of 0, the melting length of the ear portion 5 is at least 1
The maximum was 2.2 mm. In the strap 10 manufactured by the conventional method, the melting length of the ear 5 is 0.5 mm at the minimum,
The maximum was 3.8 mm. Therefore, according to the invention, the ear 5
The variation in the melting length of the sample became smaller.

Further, 60 lead-acid batteries were manufactured by the method of the present invention and the conventional method, respectively, and a charge / discharge test of 4000 cycles was performed. As a result, it was found that the ear 10 was cut by the corrosion of the electrolyte solution in the strap 10. Although it was 2% by the method of No. 2, it was 0% by the method of the present invention, and it was confirmed that the corrosion resistance was improved.

The pouring port 9 for the mold 8 is the mold 8.
The present invention is not limited to being provided only at both ends of one side in the longitudinal direction, and may be provided not only at both ends of one side in the longitudinal direction but also in the central portion.

[0014]

As described above, in the strap forming method for the battery battery electrode plate group according to the present invention, the molten lead is poured into the mold through the pouring ports at least at both ends in the longitudinal direction of the mold. Molten lead is poured into a place where a large amount of heat is released, so that heat can be balanced and the temperature of molten lead in the mold can be made uniform. Therefore, according to the present invention, the degree of melting of the ears can be made uniform, and the deterioration of corrosion resistance due to excessive melting of the ears can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an apparatus for carrying out a strap forming method for a battery electrode plate group according to the present invention.

FIG. 2 is a vertical cross-sectional view showing an example of a strap formed by the strap forming method for the storage battery electrode plate group of the present invention.

FIG. 3 is a perspective view showing an example of an apparatus for performing a conventional strap forming method for a battery electrode plate group.

4A to 4D are work process diagrams showing an example of a process of a strap forming method for a battery electrode plate group of the related art and the present invention.

FIG. 5 is a vertical cross-sectional view of a strap formed by a conventional strap forming method for a battery battery electrode plate group.

[Explanation of symbols]

 1 Electrode Plate Group 2 Cathode Plate 3 Anode Plate 4 Separator 5 Ears 6 Gutter 7 Molten Lead 8 Mold 9 Spout 10 Strap

Claims (1)

[Claims] 1. By inserting each of the ears of a group of electrode plates obtained by polymerizing a required number of cathode plates and anode plates through a separator into the molten lead of a mold, the ears and the molten lead are separated from each other. A method of forming a strap for a battery battery plate by welding to form a strap, wherein the molten lead is poured into the mold through pouring ports at least at both ends in the longitudinal direction of the mold. Method for forming group strap.