JPH0410703B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a lead acid battery plate group by welding a plurality of electrode plates. More specifically, in order to prevent the lead or lead alloy surface from being covered with an oxide film and resulting in incomplete welding, we need reliable arc generation, stable weld strength, and uniform thickness when performing arc welding in an inert gas atmosphere. The purpose of this is to make it possible to form a group of electrode plates with strong welds.

Lead-low antimony alloys and lead-calcium alloys are used in lead-acid batteries from the viewpoint of corrosion resistance and self-discharge. If these alloys are left in the atmosphere, like lead alone, their surfaces will oxidize, and if welded with this oxide film still present, a good weld surface will not be obtained and the weld strength will be insufficient. There was a problem with becoming.

Furthermore, as a recent trend, there has been an increase in the welding of electrode plates using lead-calcium alloy grids or electrode plates with lead sulfate attached, and although manual burning is difficult, automatic burning However, since burner heating is performed regardless of whether or not there is an oxide film, there is a problem in that the electrode plate group cannot be formed reliably. Therefore, as a method for reliably welding while removing the oxide film that caused these problems, a method has been adopted in which electrode plates are formed by arc welding in an inert gas atmosphere. .

However, even with this arc welding, problems such as those described below occurred one after another, resulting in frequent manufacturing defects of the electrode plates, as well as incorrect determination of pass/fail and the assembly of defective electrode plates into batteries. The worst case scenario has even occurred, leading to the collapse of the contract. Furthermore, as a result of the unstable strap formation of the electrode plate group, corrosion over time has become a serious problem.

The problem with conventional arc welding of electrode plates in an inert gas atmosphere is that the high-frequency sparks that fly between the electrode and the pole post immediately before the arc is generated can be affected by ambient temperature, humidity, the tilt of the electrode, or the pole pole. It is affected by subtle distance fluctuations between the part and the electrode. The arc that occurs immediately after that occurs at a different location each time, forming a group of electrode plates in a state where part of the base material, such as the pole pillars and the edges of the electrode plates, is melted. Therefore, in the formed electrode plate group, the strap portion may have a non-uniform cross section,
The bases of the poles melted and became narrower, resulting in poles with weak physical strength.

After the arc is generated, the molten part moves to weld the multiple electrode plate ears and the pole pillar together. One method is to fix the arc generating electrode and weld the electrode plate ear side, which forms the electrode plate group, into one piece. There is a way to weld while moving. In this case, as mentioned above, there is an unstable element in the arc generating part, so the parts that should not be melted, such as the base of the pole column, are melted, and the parts that should be melted, such as the edges of the pole plate, are sufficiently melted. A group of defective electrode plates had occurred.

Another method of welding multiple electrode plate lugs and pole pillars together by moving the molten part after arc generation is to fix the plate lugs on the base metal side and move the arc generating electrode side. However, due to fluctuations in arc voltage caused by swinging of the arc generating electrode, group welding was caused by an unstable arc, which was another problem.

In order to solve the above-mentioned problems, the present invention reliably generates a stable arc, and also facilitates and automatically forms a strong electrode plate group with uniform thickness at the welded portion between the electrode plate ear portion and the strap portion. This provides a method that can be used in a practical manner.

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 1 is a plan view of the pole pole of the present invention, and FIG. 2 is a side view thereof. In the figure, 1 is a pole pole portion, 2 is a strap portion, and 3 is a convex shape formed on the strap portion so as to protrude upward. Department.

An outline of the formation of the electrode plate group using this pole column is shown in FIGS. 3 and 4.

In order to generate an arc when welding the electrode plate group, the strap part 2 which is the base material is connected from the arc generating electrode 7.
A high frequency wave is oscillated towards the The interval at which these high-frequency sparks fly varies depending on the type of base material, the material of the electrode 7, its diameter, the flow rate of the inert gas, etc. It was found that the convex portion 3 is located higher than the electrode plate ear portion and closer to the electrode 7, and that this serves as a so-called spark-focusing welding electrode to stably capture high frequencies. In the case of the conventional strap part shown in Fig. 4, there is no convex part on the upper surface, so
It was found that 3 to 4 times out of 10, the spark flew to the base of the pole column 1' or to the part of the strap part 2' that was not directly below the arc generating electrode 7.

Immediately after the high-frequency spark is extinguished, an arc is generated and the connection is started. At that time, the strap part 2, the electrode plate group 1, and the electrode plate ear part 4 are burned in a pair to form the electrode group. FIG. 5 shows a plan view of the device set in the jigs 6, 6'. Here, the slight gap 5 between the strap part 2 and the ear part 4 is the clearance necessary to insert the electrode plate ear part 4 into the burning jig 6' and the comb-shaped strap.
Incidentally, FIG. 6 shows the pole column used in this case, and two rectangular convex portions 3 are formed upwardly at the tip of the strap portion.

The arc from the arc generating electrode 7 located above the convex part 3 of the strap part 2 is reliably collected on the convex part 3 of the strap part by the above-mentioned focusing effect, and is set while melting this part. Jig 6, 6'
Along with the parallel movement of the whole, molten lead from the convex portion 3 is added to fill the gap 5 in a lead-like manner, while welding the plurality of electrode plate ears 4 and the strap portion 2 of the pole column together,
This leads to the formation of an electrode plate group. FIG. 7 is a partial perspective view of the resulting electrode plate group, and FIG. 8 is a partial side view thereof.

FIG. 10 shows a side view of a case in which a group of electrode plates is similarly formed by welding using the conventional pole column shown in FIG. 9. In this case, problems such as thinning of the base of the pole column 1' are observed due to the flow of molten lead into the gap between the strap part 2' and the pole plate ear part 4' and unstable arc generation. It will be done.

As described in detail above, according to the manufacturing method of the present invention, since the upward convex portion is provided on the upper surface of the strap part, arc generation can be ensured at the desired position, and stable welding strength and uniform thickness can be achieved. It is easy to obtain a plate group with a strong strap portion, which greatly contributes to improving the reliability and productivity of lead-acid batteries.

[Brief explanation of drawings]

FIG. 1 is a top view showing an example of a pole column used in the method of manufacturing electrode plate groups of the present invention, FIG. 2 is a side view thereof, and FIG. An explanatory diagram of when sending sparks toward
Fig. 4 is an explanatory diagram of the conventional process of sending sparks to the strap part, Fig. 5 is an explanatory diagram of the manufacture of the electrode plate group by arc welding according to the present invention, and Fig. 6 is a perspective view of the pole column used in Fig. 5. Figure 7 is a perspective view showing the main part of the electrode plate group after welding is completed, Fig. 8 is a side view showing the main part of the electrode plate group after welding is completed, and Fig. 9 is a conventional pole column. The perspective view shown in FIG. 10 is a side view of an electrode plate group formed using the pole columns shown in FIG. 9. 1... Pole column part, 2... Strap part, 3... Convex part, 4... Plate ear part, 5... Gap, 6, 6'
... Burning jig, 7... Arc generating electrode.

Claims (1)

[Claims] 1. A strap portion 2 is placed on the electrode tab 4 of the electrode plate group 4a.
The strap part 2 has a convex part 3 and a pole part 1 facing upward on the upper surface, and then an arc generating electrode 7 is placed in an inert gas atmosphere.
A method for manufacturing a lead-acid battery plate group in which a strap part 2 is welded to a plate ear part 4 by blowing an arc toward a more convex part 3. 2. The method for manufacturing an electrode plate group for a lead-acid battery according to claim 1, wherein the strap portion 2 is arranged so that the convex portion 3 is closer to the arc generating electrode 7 than the pole column portion 1 is.