JPH09161761A - Manufacture of alkaline storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve large electric current discharge performance by preventing the deterioration of quality by creeping-up of electrolyte from a polar column part after a long-term use time of an alkaline storage battery. SOLUTION: A material of a polar column 1 is changed to forging work possible cold forging carbon steel from conventional carbon steel for a machine structure, and after this steel material is cut in a specific dimension, both ends are compressively worked, and a collar part 13 is formed in the center. Afterwards, a screw part 14 is manufactured in one end part by a rolling method being a kind of forging work, and a press is applied to another one end part 15, and a flat plate connecting part 16 is formed, and a finished polar column is used in an alkaline storage battery.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an alkaline storage battery,
In particular, the present invention relates to a method for manufacturing a large alkaline storage battery used in the industrial field.

[0002]

2. Description of the Related Art Of the various alkaline storage batteries, the large ones are used in the industrial field as an emergency power source for railway vehicles and buildings. FIG. 5 shows an example of a large-sized alkaline storage battery according to the related art.

A group of anode plates 2 and a group of cathode plates 3 are respectively welded to the lower connecting portions of the positive and negative pole columns 1, a packing 4 and a battery case cover 5 are attached to the upper portions of the pole columns, and a separator 6 is provided between the positive and negative pole plates. The one with the interposition of is inserted into the battery case 7 and the battery cover 5 is inserted.
After adhering the battery case 7 and the battery case 7, the liquid stopper 8 is attached to the screw portion at the center of the battery case cover, and the electrolytic solution is injected from the liquid stopper port.

As described above, these alkaline storage batteries are provided with pole columns for taking out electric energy from the electrode plate group to the outside and holding the electrode plate group as one of the components. For these poles, so-called slit-type ones with a complicated shape in which a pole plate connection part was welded to a cylindrical material of a certain size have been used, but recently, the shape has been simplified to a cylindrical round bar shape. Nearly cutting and polishing type has come to be used.

An example of such a pole will be described below with reference to the drawings. FIG. 2 (A) shows a front view of a conventional cutting and polishing type pole. Reference numeral 9 is a screw portion, 10 is a horizontal cutting portion, 11 is a vertical cutting portion, FIG. 2B is a partial side view of FIG. 2A, and 12 is a pole completed by vertical and horizontal cutting and polishing. It is a plate connection part.

[0006] As a conventional method for manufacturing the pole column for an alkaline storage battery, a columnar carbon steel for mechanical structure (S25C) is used.
After cutting to a predetermined size and cutting both end faces, similarly make a screw part at one end by cutting and cut the other side from both sides into a flat plate shape and polish it to the electrode plate connection part. It was made and finished into a pole.

[0007]

However, in such a conventional method, since the machining of the electrode plate connecting portion is composed of two steps of vertical cutting and horizontal cutting, polishing time is consumed.
Material loss is also large. Further, when the alkaline storage battery is used by floating charging for a long period of 10 years or more, the appearance of a white carbonate adheres to various parts of the upper part of the pole due to the rising of the electrolytic solution. However, the alkaline storage battery has excellent durability such as excellent large current discharge performance and capacity recovery even after complete discharge, but it is disadvantageous in that the cost is high. Therefore, alkaline storage batteries today are required to have stable quality and performance for a long period of time and cost reductions associated therewith.

An object of the present invention is to provide an inexpensive alkaline storage battery which solves the above-mentioned conventional problems, improves the quality of the alkaline storage battery, and further improves the large current discharge performance.

[0009]

In order to achieve this object, in the present invention, the material of the poles is changed to a cold forging steel material which can be forged, and after this steel material is cut to a certain size. , Both ends are compressed to form a collar at the center. After that, the pole column having the screw portion at one end and the electrode plate connecting portion at the other end formed by compression pressing is used for the alkaline storage battery. In this way, by eliminating the cutting process, material loss and man-hours are reduced, and the current-carrying cross-sectional area is not reduced as compared with the original steel material, so the discharge performance is also improved. Further, since the flange portion having a diameter larger than the original steel material diameter is provided, the sealing area of the packing interposed between the collar portion and the inner surface of the battery case cover is increased to prevent the electrolyte from creeping up.

[0010]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to FIG. After cutting a cylindrical steel material to a predetermined size, both ends are compression-processed in the longitudinal direction and the collar portion 13 of FIG.
To form After that, 14 threaded portions are formed on one end by a rolling method, which is a type of forging, and the other end 15 is forged until it has a predetermined thickness, and a part of FIG. The pole post finished by forming 16 flat plate-like electrode plate connecting portions shown in FIG. 1 (B) which is a side view is used for an alkaline storage battery.

At this time, it is effective to change the material of the poles from the conventional carbon steel for machine structure (S25C) to carbon steel for cold forging (SWCH10R) which can be forged.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in more detail with reference to FIG.

In the pole 1 according to the present invention, a cylinder made of carbon steel for cold forging having a diameter of 22 mm is cut into a constant size of 84 mm, and then both ends are subjected to compression processing to form a collar portion 13 at the center, and thereafter, The threaded portion 14 is formed on one end by a rolling method, the other end 15 is pressed to form a flat electrode plate connecting portion 16 having a thickness of 10 mm, and finished, and the electrode pole is nickel-plated. Was applied. Sintered nickel anode plate 13
6 sheets, 8 sheets by alternately arranging 13 sheets, also 13 sheets of cathode plates
It is divided into a total of 4 groups of 6 pieces, 6 pieces, and 6 pieces, and after temporarily fixing the lead parts of the same polarity electrode plate by spot welding, they are collectively spot welded to the positive and negative electrode plate connection parts 16 and the collar part 13 After installing the packing on the top, insert the electrode plate group made by inserting the separator between the positive and negative electrode plates into the battery case cover with nuts, and finally insert the battery case cover and the battery case. An alkaline storage battery A according to an example of the present invention having a nominal capacity of 60 Ah was obtained by adhering it to a tank and injecting an electrolytic solution up to a specified liquid level line.

For comparison, an alkaline storage battery manufactured in the same manner as in the above-mentioned embodiment using a conventional pole column manufactured by a cutting and polishing method using a conventional carbon steel for machine structure was used as a comparative battery B.
And

Next, Example battery A and Comparative battery B were set at 25 ° C.
At room temperature, the battery was charged with a constant current of 6 A (0.1 CA) for 16 hours, and then discharged with a constant current of 60 A (1.0 CA) to a storage battery voltage of 1.0 V / cell. The initial capacity was used. Next, at room temperature of 25 ° C., 6 A (0.1
Charged for 16 hours with a constant current of (CA), 120A (2.0C
The battery was discharged to a battery voltage of 1.0 V / cell with the constant current of A). After that, after charging with a constant current of 6 A (0.1 CA) for 16 hours, 180 A (3.0 CA), 240 A (4.0)
CA), 300A (5.0CA), 360A (6.0C)
Charge and discharge were repeatedly performed with the constant current of A). The results of this capacity test are shown in FIG. 3, and the discharge voltage and capacity ratio are shown in FIG. It can be seen from FIG. 3 that the larger the discharge current, the better the capacity of the example battery A than the comparative battery B. Further, FIG. 4 shows that Example battery A is superior to Comparative Example battery B in the discharge intermediate voltage at each discharge rate, and the decrease in capacity is small even if the discharge rate increases. Furthermore, in order to observe the rising of the electrolytic solution of Example battery A and Comparative battery B, -10 ° C
As a result of conducting a quasi-mill test in which a heat shock of up to ˜65 ° C. is applied for 24 hours in one cycle for 60 days while charging 0.2 A, a small amount of carbonate was observed in a part of the pole in Comparative Example Battery B. However, there was no change in Example Battery A. From the above results, it can be seen that the alkaline storage battery using the forged pole column has a higher performance than the conventional alkaline storage battery.

[0016]

As described above, according to the present invention, it is possible to prevent the electrolytic solution from creeping up from the pole portion of the alkaline storage battery by the improvement of the method for manufacturing the pole battery, which improves the quality and is more than the conventional alkaline storage battery. Improvement of high current discharge performance is achieved. Along with this, the cost reduction of the alkaline storage battery is also achieved, and the industrial utility value is great.

[Brief description of the drawings]

FIG. 1 is a diagram showing a forged pole column of the present invention.

FIG. 2 is a diagram showing a cutting and polishing type pole column according to a conventional technique.

FIG. 3 is a diagram showing the capacity test results of an alkaline storage battery using the pole of the present invention and a conventional alkaline storage battery.

FIG. 4 is a diagram showing a discharge voltage and a capacity ratio of an alkaline storage battery using a pole of the present invention and a conventional alkaline storage battery.

FIG. 5 is a perspective view showing a conventional alkaline storage battery.

[Explanation of symbols]

 1 pole pillar 2 anode plate 3 cathode plate 4 packing 5 battery case cover 6 separator 7 battery case 8 liquid stopper 9 screw part 10 horizontal cutting part 11 vertical cutting part 12 electrode plate connection part 13 collar part 14 screw part 15 press part 16 poles Board connection

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomotoshi Hara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A positive electrode plate and a negative electrode plate are alternately laminated with a separator interposed therebetween, and each of the positive electrode plate and the negative electrode plate has its lead portion electrically and mechanically connected to a pole that also serves as an external terminal. A method for manufacturing an alkaline storage battery, which is an alkaline storage battery, characterized in that the collar portion located between the screw portion of the pole and the electrode plate connecting portion is formed by a forging method. 2. The method for manufacturing an alkaline storage battery according to claim 1, wherein the pole column formed by the forging method is made of carbon steel for cold forging.