JP2000260462A - Lead-acid battery and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lead-acid battery stabilized in welding a shelf in relation to the shelf for connecting a lead-acid battery, in particular, a connection body to the outside to an ear led from an electrode plate. SOLUTION: Additional lead 6 is melted by a burner 7. At that time, the tip of the flame of the burner 7 threads through the space between the additional lead 6 and a connection body 3 and reaches the upper surface of a welding jig 1. At that time, since a stepped part 5 is formed, the flame can run around to the undersurface of the connection body 3 and the gap of an ear part 2 without reflecting on the welding jig 1. The molten lead runs around even to the stepped part 5, and a step is formed at the connection part of the connection body 3 to a shelf part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead storage battery, and more particularly to a shelf for connecting a connection body with the outside and an ear portion derived from an electrode plate.

[0002]

2. Description of the Related Art In a lead-acid battery, a method of welding a group of electrodes for integrating ears led out from the electrodes is to insert the electrode ears into a welding comb and add the gas burner from above to melt the lead. There are two general methods: a burning method that forms a shelf, and a cast-on method that forms a shelf by pouring molten lead into a mold, inverting the electrode plates into this mold, inserting ears, and forming a shelf. It is a target.

[0003] Among them, the burning welding method will be described with reference to the drawings. In FIG. 2, 1 is a comb-shaped welding jig, 2 is an electrode plate ear, 3 is a connector inserted into the comb-shaped welding jig 1, and 4 is such that molten lead does not flow out of the welding jig 1. 6 is additional lead, 7 is a burner for welding
Is shown. In these constructions, the electrode plate lug 2 inserted into the welding jig 1, the connector 3 and the lead 6 are melted by a burner 7 to form a shelf.

FIG. 2 shows an example in which a shelf is formed by this method, but a gap is generated between the connector and the shelf, resulting in insufficient welding.

[0005] In today's lead-acid batteries, the alloy system used differs depending on each part. For example, the above-mentioned connection body has good castability for making a connection with the outside, and S containing antimony (Sb) for making it hard to be oxidized.
A b-based alloy is used. On the other hand, a Ca-based alloy containing calcium (Ca) is used for the lattice body including the ears of the electrode plates to increase the hydrogen overvoltage and increase the strength.

However, these alloys are used separately from each other. For example, when Sb and Ca are present at the same time, they become Sb2Ca3, and when they are exposed in the lead-acid battery, corrosion is likely to occur from that part. Become.

[0007]

As described above, the reason why a gap is generated near the joint between the shelf and the connector is that the flame discharged from the burner is reflected on the welding jig. In some cases, it was difficult for the flame to enter the base of the connector. Further, the molten lead in which the added lead has been melted cannot flow into the lower surface of the shelf, and a gap may be generated in the vicinity of the joint between the shelf and the connector.

[0008] If such a gap is formed, the welding becomes insufficient, and the corrosion is likely to progress through the gap, and there is a case where the wire is disconnected and electricity cannot be taken out.

In order to prevent such poor welding, it is conceivable to increase the flame of the burner. However, in this case, the respective alloys constituting the ears and the connecting body are mixed with each other, so that the ledges are not connected. Sb2Ca3 is formed on a part of the surface of. When this is reduced in the lead storage battery and the shelf is exposed, corrosion may occur from that part and disconnection or the like may occur.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a lead storage battery in which the welding of the shelf is stable.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a lead storage battery provided with a shelf for connecting ears of an electrode plate and a connector, wherein the shelf and the connector are connected to each other. Is provided with a step on the lower surface of the connecting portion.

With this configuration, the welding surface of the connection body can be partially floated from the welding jig, so that the flame discharged from the burner easily enters the bottom surface of the connection body and the shelf. Therefore, the flame of the burner is not reflected on the welding jig, and the melting of lead does not become insufficient. Also,
Molten lead in which lead is added to the bottom surface of the connection body also easily flows, and the weldability is further improved.

The above configuration is particularly effective in a lead storage battery in which an Sb-based alloy is used for the connection body and a Ca-based alloy is used for the lattice body including the ears.

Further, in the present invention, a jig provided with a step near a lower surface of a connecting portion between a shelf and a connecting member is used in the manufacturing method by the burning method.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a welding method when the shelf is formed. In the figure, 1 is a comb-shaped welding jig having a step,
Reference numeral 2 denotes an electrode plate ear, 3 denotes a connection body, 4 denotes a metal plate, 5 denotes a step portion provided on the bottom surface of the connection body of a comb-like welding jig, 6 denotes an additional lead located on the welding jig, and 7 denotes welding. Burners are shown.

In such a configuration, the additional lead 6 is melted by the burner 7. At this time, the leading end of the flame of the burner 7 is sewn through the gap between the additional lead 6 and the connection body 3 to form the welding jig 1.
Has reached the top of At this time, since the stepped portion 5 is provided, the flame can easily go around the lower surface of the connector 3 or the gap between the ears 2 without reflecting the flame to the welding jig 1.

FIG. 2 shows the shelf thus formed.
The molten lead wraps around the step 5, and the step of the welding jig 1 forms a step at the connection between the connector 3 and the shelf.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of one embodiment of the present invention shown in FIG.
According to the conventional method shown in FIG.
Individually produced. This lead-acid battery uses Pb
-2.6% Sb-0.28% As alloy, Pb-2.5% Sn alloy on the shelf (additional lead), Pb- on the ears
Prepared using 0.02% Ca-0.25% Sn alloy,
Pb-2.6% Sb-0.28% A for the connection body on the positive electrode side
s alloy, Pb-2.6% Sb-
0.28% As alloy, Pb-2.6% Sb-
It was prepared using a 0.28% As alloy. These were inserted into a 6-cell battery case to obtain a lead-acid battery of 12 V and 60 Ah.

Using this lead storage battery, 13.8 V, 90 ° C.
For one month, and the occurrence of defects in the shelf was determined by visual inspection, and the defect rate is shown in (Table 1).

[0021]

[Table 1]

As is clear from Table 1, the lead storage battery of the present embodiment has a lower rate of occurrence of insufficient welding in which a gap is formed at the junction between the shelf and the connector compared to the conventional lead storage battery. It can be seen that is reduced.

[0023]

As described above, according to the present invention, by providing a step on the lower surface of the connecting portion between the connector and the shelf, the step can be provided on the welding jig, and the burner is also provided on the lower surface of the connector. The flame easily enters, along with which the molten lead easily flows, the weldability between the ears of the electrode plate and the group shelf is improved, and a highly reliable lead storage battery can be provided.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram when a shelf is formed according to an embodiment of the present invention.

FIG. 2 is a front view of a shelf according to an embodiment of the present invention.

FIG. 3 is a conceptual diagram of a conventional example when a shelf is formed.

FIG. 4 is a front view of a conventional shelf unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding jig 2 Ear part 3 Connection body 4 Backing plate 5 Step part 6 Supplementary lead 7 Burner 8 Shelf

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuo Tomioka 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. Terms (reference) 5H022 AA01 BB15 CC15 CC20 CC23 EE01 5H028 AA05 BB05 CC05 EE01 HH05

Claims (5)

[Claims] An electrode group comprising a positive electrode plate, a negative electrode plate, and a separator, and a battery case in which the electrode plate group is accommodated, wherein the positive electrode plate and the negative electrode plate have ears formed therein. A lead-acid battery in which a shelf for connecting polarities is formed, and a connecting body that conducts between the shelf and the outside of the battery case is provided, on a lower surface of a connecting portion between the shelf and the connecting body. Is a lead-acid battery provided with a step. 2. The lead-acid battery according to claim 1, wherein the connection body on the negative electrode side is an antimony-based alloy, and the lugs are a calcium-based alloy. 3. An electrode group comprising a positive electrode plate, a negative electrode plate, and a separator, and a battery case in which the electrode plate group is accommodated, wherein the positive electrode plate and the negative electrode plate have ears formed therein. A shelf that connects the polarities is formed, a connector that connects the shelf and the outside of the battery case is used, and the ears and the connector are placed in a mold that models the shape of the shelf. A method for forming a shelf by injecting molten lead into the mold and solidifying the lead, wherein a mold provided with a step at a portion in contact with the bottom surface of the connector is used. Characteristic manufacturing method of lead storage battery. 4. An electrode group comprising a positive electrode plate, a negative electrode plate, and a separator, and a battery case in which the electrode plate group is housed, wherein the positive electrode plate and the negative electrode plate have ears formed therein. What is claimed is: 1. A method for manufacturing a lead-acid battery in which polarities and a connector for conducting between the outside of the battery case are connected via a shelf, wherein a lug of an electrode plate is attached to a comb of a welding jig having a comb surface. Insert and position the connector in the welding jig so as to be in contact with the short side surface of the ear portion projecting upward from the comb surface, and the bottom portion of the connection body in contact with the short side surface of the ear portion A step is provided in at least a part of the welding jig, and the ear, the shelf, and the connecting body are welded in a state where at least a part of a connection body welding surface is floated from the welding jig. Manufacturing method of lead storage battery. 5. The step provided on the welding jig is 0.3 to less than 0.3.
The method according to claim 3, wherein the lead storage battery has a thickness of 1.0 mm.