JPH11345603A - Forming method of strap for lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently manufacture a strap with stable quality with compact, sanitary equipment by melting a solid lead alloy in a mold by high frequency induction heating or electric resistance heating. SOLUTION: A lead-acid battery strap is formed by immersing an electrode lug in a molten lead alloy in a mold and solidifying it. The molten lead alloy is prepared by melting the specified amount of solid lead alloy in the mold. Wire-like or powdery sold lead alloy is used. A coil for high frequency induction heating is placed in the lower part of the mold, the lead alloy is put into the mold, and lead alloy is melted by induction-heating the lead alloy for about 10 seconds. The electrode lug is immersed in the molten lead alloy, then the molten lead alloy is solidified to join the electrode lug and a strap. Or the mold is heated by directly passing electricity through the mold to melt the solid lead alloy. Since the amount of lead alloy of the strap is correctly controlled, the quality is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for forming a lead storage battery strap.

[0002]

2. Description of the Related Art Conventionally, in the manufacture of an electrode group for a lead-acid battery, as a strap forming method, a strap forming cavity is engraved in a mold, a molten lead alloy is injected into the cavity, and an electrode plate ear is formed by a strap. The so-called cast-on-strap method of welding at the same time is known and generally used.

[0003]

The cast-on-strap equipment requires a furnace for producing a molten lead alloy, an inlet pipe for guiding the molten lead alloy to a mold, and a mechanism for injecting a fixed amount of molten lead. These are major obstacles in terms of equipment cost, maintenance cost, and the like when introducing the apparatus. For example, in a furnace, the lead alloy needs to be constantly melted, so that heating is performed using gas or electricity. In addition, in order to use a molten lead alloy, an exhaust system is indispensable for safety and health. The inlet pipe also needs to be constantly heated so that the lead alloy does not solidify in the passage.

Further, since the molten lead alloy is in a liquid state at a high temperature, it is difficult to perform quantitative control, and there is a problem that an error in the injection amount is inevitably increased. In addition to the above, there is a disadvantage that time is required for heating at the time of starting up the equipment, and the equipment cannot be operated efficiently.

The present invention reduces the above-mentioned problems, that is, equipment and maintenance costs caused by handling molten lead, and provides more efficient equipment operation.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a method for forming a lead-acid battery strap, which comprises dipping and solidifying an electrode lug in a molten lead alloy in a mold to form a strap. For molten lead alloy, a certain amount of solid lead alloy must be melted in the mold.Also, the solid lead alloy must be linear or granular. It is characterized in that it is performed by heating the mold with electric resistance.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the method for forming a lead storage battery strap according to the present invention, a fixed amount of solid lead alloy is melted in the mold. A linear or granular solid lead alloy is used. The melting of the solid lead alloy in the mold is performed by high-frequency induction heating or electric resistance heating of the mold. By doing so, the device can be made compact and sanitary, and the quality can be stabilized.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a cast-on-strap method, an electrode plate ear is immersed in molten lead in a mold engraved with a strap shape, and is taken out after solidification. FIG. 1 shows a schematic diagram. 1 is a strap, 2 is a tab for connection between cells, 3 is an electrode plate ear, 4 is a mold, and 5 is an engraved portion of the mold 4.

Conventionally, a molten lead alloy has been injected into the mold, but in the present invention, a solid lead alloy is charged into the mold to melt the interior of the mold. The details will be described below.

In the test, a group of electrodes (four positive electrodes and four negative electrodes) used for a lead storage battery for automobiles was used. The thickness of the pole ears is 1 mm and the width is 10 mm, and Pb-Ca-S
It is made of n alloy. The dimensions of the strap part are 30 × 1
The 5 × 5 mm thickness, the tab portion for connecting cells was 10 × 15 × 5 mm thickness, and the total volume was 3 cc. The required amount of lead alloy is about 34 g.

A coil for high-frequency induction heating was placed under the mold. Conditions were 30 KHz and 30 KW, and the energization time was changed.

34 g of a granular Pb-1% Sn alloy having a diameter of about 2 mm was charged into a mold, and high-frequency induction heating was performed for 10 seconds to melt the alloy. At this time, the temperature of the molten alloy is 4
The temperature was 50 ° C., and there was little variation in the mold. The electrode plate ears were immersed therein and taken out after completion of coagulation. The joint between the pole ear and the strap was good.

A similar test was performed using a linear lead alloy instead of a granular lead alloy. The alloy is a linear Pb-1 with a diameter of 1 mm.
34 g of a% Sn alloy cut in units of 5 mm was charged. Also in this case, the joint state between the electrode plate ear and the strap was good.

In this case, the lead alloy in the mold was melted by high-frequency induction heating. However, the same effect can be obtained by using a method in which the mold is heated by applying a current directly to the mold to melt the solid lead alloy. Is obtained.

[0015]

According to the present invention, a furnace for producing a molten lead alloy, an introduction pipe for guiding the molten lead alloy to a mold, a mechanism for quantitatively injecting molten lead, and the like, which are required in a conventional cast-on-strap apparatus, are provided. The device is compact and sanitary because no need exists. Furthermore, since the amount of lead in the strap can be accurately controlled, the production quality is stable. From these characteristics, the industrial value of the present invention is great.

[Brief description of the drawings]

FIG. 1 is a schematic view of a strap and a mold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strap 2 Cell connection tab 3 Electrode plate 4 Mold 5 Engraved part

Claims (3)

[Claims] 1. A method for forming a strap for a lead-acid battery by dipping and solidifying an electrode lug in a molten lead alloy in a mold to form a strap, wherein the molten lead alloy includes a fixed amount of a solid lead alloy in the mold. A method for forming a strap for a lead storage battery, wherein 2. The method for forming a lead storage battery strap according to claim 1, wherein the solid lead alloy is linear or granular. 3. The method for forming a lead storage battery strap according to claim 1, wherein the melting of the solid lead alloy in the mold is performed by high-frequency induction heating or electric resistance heating of the mold.