JPH0513065A - Manufacture of lead-acid battery - Google Patents

Abstract

PURPOSE:To inhibit a continuous body part including antimony from being flown out, and to inhibit the continuous body part from being directly in contact with a lug part by heating and welding the lug part of a lattice body and a shelf part together at first, and then by heating and welding the shelf part and the continuous body part together, so as to form a contact part. CONSTITUTION:A lattice body lug part 2 of a plate for which a lattice body 1 made of lead-calcium alloy is used, and a shelf part 3 comprising a lead-tin alloy including not less than 0.1wt% of tin, but not including antimony and calcium, are formed. A continuous part 4 made of lead-antimony alloy including no less than 2.5wt% of antimony is also formed. The contact part of these is formed by initially heating and welding the lug part 2 and the shelf part 3 together, and then heating and welding the shelf part 3 and the continuous part 4 together. The continuous part 4 including antimony is thus inhibited from being flown out and thus being in direct contact with the lug part 2, and a stable plate group that is not easily corroded even when the lug and shelf parts 2, 3 are exposed, is thus provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a lead storage battery widely used as a starting power source for automobiles and industries.

[0002]

2. Description of the Related Art In recent years, lead-calcium alloys have come to be widely used for the negative electrode of a lead storage battery or both the negative electrode and the positive electrode. When such a lead-calcium alloy is used for the lattice and a lead-antimony alloy is used for the shelf, corrosion tends to proceed when the joint is exposed in the gas phase, and the joint may be cut. there were. This is generally considered to be due to the instability of antimony and calcium compounds formed at the joint. Therefore, it has been attempted to use pure lead or a lead alloy containing no antimony as the alloy component of the connection body, but the formation of a compound consisting of antimony and calcium was suppressed, but the grain boundaries of antimony did not occur. Therefore, there is a problem that corrosion progresses along the grain boundaries.

There is also a proposal to use a lead-tin alloy containing no antimony in the shelf portion. This example will be described with reference to FIG. It is composed of a connecting body portion 4 for connecting cells, a shelf portion 3 and a lattice body ear portion 2,
Each is joined to form a plate group. Conventionally, these were simultaneously welded, or the connecting body portion 4 and the shelf portion 3 were first welded by a thermal power such as a burner. However, especially in the vicinity of the connecting body portion, the lead-antimony alloy of the connecting body portion 4 is lead-calcium. It melts on the side of the latticed ear portion 2 made of a system alloy, and a joint portion of 4 and 2 occurs. For this reason, there is a drawback in that when this portion is exposed from the electrolytic solution, corrosion remarkably progresses.

[0004]

Therefore, the connection body portion 4 is prevented from melting and coming into contact with the ear portion 2 during welding, and is connected to the lattice body ear portion 2 where antimony and calcium may be mixed. There has been a long-awaited need for a manufacturing method in which an electrode plate group is formed without the joining portion of the body 4 being present.

[0005]

Therefore, in order to solve these problems, the present invention uses a lattice body ear portion 2 of an electrode plate using a lattice body 1 made of a lead-calcium alloy, antimony and calcium. It is formed of a shelf portion 3 made of a lead alloy not containing it and a connecting body portion 4 made of a lead-antimony-based alloy, and these joint portions form a lattice body ear portion 2 and a shelf portion 3.
Is first heat-welded, and then the shelf portion 3 and the connector portion 4 are heat-welded to form a joint portion.

[0006]

OPERATION Begin to make the joint 3 and 2 by first welding the lattice ear 2 and the shelf 3 and then the shelf 3
And the connecting body portion 4 are welded to each other to form a joint portion of 3 and 4.

By doing so, it is possible to prevent the connecting body portion 4 containing antimony from flowing out and coming into direct contact with the ear portion 2.

[0008]

EXAMPLES An example of the present invention will be described below.

FIGS. 1A and 1B are views showing respective constituent parts and an assembled electrode plate group. In the figure, 1 is a lattice,
Reference numeral 2 is a lattice ear portion, and in the present embodiment, each is lead-0.08.
An alloy having a composition of weight% (hereinafter simply abbreviated as%) calcium-0.6% tin was used. 3 is a shelf portion, which is lead-in this embodiment.
A 1.2% tin alloy was used. Reference numeral 4 represents a connecting portion, and lead-2.6% antimony-0.3% arsenic alloy was used in this embodiment. Welds 2, 3 and 4 are made into a shelf portion A formed by sequentially welding the ear portion and the shelf portion, and then the shelf portion and the connector portion in accordance with the present invention.

For comparison, the same configuration as above is used for 2, 3,
4 is welded at the same time to form a shelf portion, which is referred to as B.

In the grid 1 and the grid ears 2, lead-0.
08% calcium-0.6% tin, lead on shelf 3-2.
A 6% antimony-0.3% arsenic alloy and a lead-2.6% antimony-0.3% arsenic alloy were used for the connection part 4 to weld C, which was welded 2, 3 and 4 at the same time.

Lead acid batteries having these A, B, and C joint shelf portions were prepared and subjected to a constant voltage overcharge test of 14.8 V at a temperature of 60 ° C. to observe the corrosion state. In order to accelerate the corrosion rate, the surface of the electrolyte is on the shelf portion 3 and the lattice ear portion 2.
It controlled below the contact part of.

The results are shown in (Table 1).

[0014]

[Table 1]

From (Table 1), in C, remarkable corrosion was observed in the lower shelf portion in the second week. In B, partial corrosion was observed at the joint surface between the connector 4 and the ear portion 2 in FIG. 2, and significant corrosion was observed at this portion at 6 weeks. In A, almost no corrosion was observed up to 10 weeks.

By first welding the lattice body ears 2 of A and the shelf portion 3 to make a joint portion of 3 and 2 as shown in FIG. 3, and then by welding the shelf portion 3 and the connecting body portion 4. The manufacturing method of forming the joint portion of 3 and 4 is effective. By setting the tin content of the shelf portion 3 to 1% or more, the corrosion resistance of the shelf portion itself is improved. Further, by setting the amount of antimony in the connecting body portion to be 2.5% or more, the crystal grain boundary can be made small and the corrosion of the grain boundary portion can be suppressed.

By heating the shelf portion 3 in advance, it is possible to easily form a cut surface as shown in FIGS. 4 and 5, and it is not possible to form a direct joint surface between the connector 4 and the ear portion 2. It is possible to improve the reliability of that.

[0018]

As described above, according to the present invention, it is possible to provide a method of manufacturing an electrode plate group having a stable joint portion which is not easily corroded even when the shelf portion joined to the ear portion is exposed. it can.

[Brief description of drawings]

FIG. 1 is a diagram showing a joint portion of a lead storage battery. (A) Perspective view before joining (B) Perspective view after joining

FIG. 2 is a cross-sectional view of a joint portion by a conventional welding method.

FIG. 3 is a cross-sectional view of a joint portion according to the welding method of the present invention.

FIG. 4 is a cross-sectional view of a joint portion according to another welding method of the present invention.

FIG. 5 is a cross-sectional view of a joint portion according to another welding method of the present invention.

[Explanation of symbols]

1 lattice 2 lattice ears 3 shelves 4 connection part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Yasuda             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Katsuhiro Takahashi             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd.

Claims (3)

[Claims] 1. A lattice ear portion of an electrode plate using a lead-calcium alloy lattice, a shelf portion made of a lead alloy containing no calcium and antimony, and a connecting portion made of a lead-antimony alloy. The lattice ear portion and the connecting body portion are joined together by first heat-welding the lattice body ear portion and the shelf portion, and then the welding is started between the shelf portion and the connecting body portion to form the joint portion. A method of manufacturing a lead storage battery, comprising: 2. The lead-tin alloy containing tin at a concentration of 0.1% by weight or more, and the connector portion made of lead-antimony alloy containing an antimony concentration of 2.5% by weight or more.
A method for manufacturing the lead-acid battery described. 3. The method for manufacturing a lead storage battery according to claim 1, wherein only the shelf portion is heated in advance and then melted.