JPH09251850A - Lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent adhesive deficiency which may occur unless a projection is positioned at the center of a recess by disposing a plurality of vertical ribs for restricting an interval between the surface of the projection and the inner face of the recess in either one of the inner face of the recess formed on a battery jar cover and the surface of the projection. SOLUTION: A recess 12 is formed on the upper opening of a battery jar 1, and further, a projection 13 to be fitted into the recess 12 is formed on the lower opening of a battery jar cover 2. Vertical ribs 15, 16 are arranged at an adequate interval at the surface of the projection 13. The ribs 15, 16 keep the interval between the surface of the projection 13 and the inner face of the recess 12 constant. Consequently, an adhesive layer 20 having a predetermined thickness can be interposed between the surface of the projection 13 and the inner face of the recess 12, the adhering portion between which has uniform adhesive strength over the entire circumstance.

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 relatively large lead storage battery.

[0002]

2. Description of the Related Art The battery case and lid of a lead storage battery are usually made of synthetic resin. Then, as a method of sealing the opening of the battery case with a lid, a structure such as polypropylene that is heat-welded, and a structure in which the battery case and the lid are fitted with an uneven portion,
There is a method of bonding with an adhesive. In the latter bonding method, the bonding portion has a structure as shown in FIG. 6, for example. That is, the recess 23 is provided on the end surface of the opening of the battery case 21, and the protrusion 24 that fits into the recess 23 is provided on the opening of the battery cover 22. Then, the concave portion 23 of the battery case 21 is filled with the adhesive 25, the battery case lid 22 is covered, and the convex portion 24 is fitted into the concave portion 23. At this time, the convex portion 24 is not necessarily located at the center of the concave portion 23. For example, when the convex portion 24 is biased to one side in the concave portion 23 as shown in FIG. 6, the adhesive is extruded to the outside of the concave portion 23 on the biased side as shown by 25a. Therefore, a sufficient amount of adhesive is not secured, and the adhesive strength becomes weak in this portion.

If there is such a weak adhesive strength,
When the battery is transported or installed, the lid comes off, or even if the lid does not come off, the gas generated during overcharge is leaked to the outside, resulting in various problems such as a decrease in the amount of electrolytic solution. In particular, in sealed lead-acid batteries used for power distribution equipment, substation power supplies, or building emergency lighting power supplies, the size of the battery case is large, so the fitting part between the concave part and the convex part may be bent at the center. Since there are many deviations, poor adhesion is likely to occur. Further, in the structure in which the convex portion is fitted to the bottom of the concave portion, no adhesive agent is interposed between the tip of the convex portion and the bottom of the concave portion, which is disadvantageous in terms of adhesive strength.

[0004]

SUMMARY OF THE INVENTION In view of the above, the present invention fits a concave portion provided on the end face of one opening of the battery case and a convex portion provided on the end face of the other opening, and An object of the present invention is to eliminate adhesion failure due to the protrusion not being located at the center of the recess in a lead storage battery that is bonded by an adhesive. It is another object of the present invention to provide a lead storage battery having a high adhesive strength by allowing an adhesive to intervene between the tip of the convex portion and the bottom of the concave portion.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a recess provided on one opening end face of a battery case and a cover for sealing the opening of the battery case and a projection provided on the other end face of the battery case are fitted together. In a lead-acid battery formed by bonding and bonding with an adhesive, at least one of the inner surface of the concave portion and the surface of the convex portion is provided with a plurality of vertical ribs that regulate the distance between the surface of the convex portion and the inner surface of the concave portion. It is characterized by that. At least one of the bottom surface of the concave portion and the tip of the convex portion is provided with a plurality of ribs for restricting the convex portion from entering the concave portion.

[0006]

Embodiments of the present invention will be described below. FIG. 1 shows the structure of a lead storage battery according to the present invention. AB
In the battery case 1 made of S resin, an electrode plate group in which positive electrode plates 3 and negative electrode plates 5 are alternately laminated via a separator 4 is inserted so that a group pressure is applied in the laminating direction. On the electrode plate group, a shelf 6 to which the ears of the positive electrode plate 3 are connected, and the negative electrode plate 5
Is provided with the ears 7 connected to the ears, and the ledge 6 and the ledge 7 are connected to the positive electrode terminal 8 and the negative electrode terminal 9 by welding, respectively. A ring-shaped lead alloy bushing 10 is integrally formed at a position corresponding to the positive electrode terminal 8 on the battery case lid 2 adhered to the opening of the battery case 1 with an adhesive. The bushing 10 and the large diameter portion of the positive electrode terminal 8 are heated by a burner and welded, and a filler 11 is injected to seal the terminal portion. Similarly, the negative electrode terminal 9 is also welded and sealed to the bushing. Regarding the dimensions of this battery, for example, the width of one cell is about 170 mm, the length of the electrode plates in the stacking direction is about 340 mm, and the height is about 320 mm.

A recess 12 is formed in the upper opening of the battery case 1, and a projection 13 is fitted in the recess 12 in the lower opening of the battery cover 2.
Are provided respectively. Then, vertical ribs 15 and 16 are provided on the surface of the convex portion 13 at appropriate intervals. The width of the concave portion 12 is about 4 mm, the depth thereof is about 9.5 mm, and the thickness of the convex portion 13 is about 1.6 mm. Also, FIG.
As shown in, the rib 15 has a width of about 2 mm and a length of about 8 mm.
And are provided at intervals of about 80 mm. The ribs 16 have a width of about 2 mm and a length of about 8 mm, and the ribs 15 are spaced at intervals of about 80 mm.
Is provided at a position corresponding to.

By these ribs 15 and 16, the distance between the surface of the convex portion 13 and the inner surface of the concave portion 12 can be made constant. Therefore, a layer of the adhesive 20 having a constant thickness is interposed between the surface of the convex portion 13 and the inner surface of the concave portion 12, and the adhesive portion between the two has uniform adhesive strength over the entire circumference. The ribs 15 and 16 do not need to be provided at corresponding positions on the outer surface and the inner surface of the convex portion, respectively, but it is advantageous to provide them in correspondence so that the convex portion 13 is located at the center of the concave portion 12. .

Ribs 14 are provided on the bottom surface of the recess 12 of the battery case 1 at appropriate intervals. The rib 14 has a width of about 2 m
m, height about 1 mm, provided at intervals of about 150 mm. Due to the ribs 14, the convex portion 13 does not reach the bottom of the concave portion 12, so that an adhesive layer having a constant thickness can be interposed between the tip of the convex portion 13 and the bottom surface of the concave portion 12. Further, due to the action of the ribs 14, a constant gap is formed between one edge portion of the concave portion 12 of the battery case 1, the inner edge portion in the example of FIG. 2 and the corresponding step portion of the battery case lid 1. . Then, by fitting the convex portion 13 into the concave portion 12 filled with the adhesive 20,
The adhesive pushed out by the convex portion 13 enters the above-mentioned gap and serves to increase the adhesive strength. The ribs 14 are preferably provided at positions deviated from the ribs 15 and 16 in the vertical direction. If these ribs are in the same position,
This is because the portions where the adhesive does not intervene overlap each other to locally form a portion with weak adhesive strength.

In the above example, the recess 12 is provided in the battery case 1,
Although the convex portion 13 is provided on the battery case lid 2, the convex portion may be provided on the battery case and the concave portion may be provided on the battery case lid. That is, FIG.
An example is shown in which the rib 17 that restricts the protrusion 13 from entering the recess 12 and the ribs 18 and 19 that restricts the distance between the surface of the protrusion 13 and the inner surface of the recess 12 are provided in the battery case 1.

In the above-described embodiments, the battery case is shown as having a one-cell configuration, but a lead storage battery usually has a configuration in which a plurality of cells are arranged in the stacking direction of the electrode plates. Needless to say, this also applies to batteries having such a configuration. Further, the present invention can be applied to a lead storage battery having a configuration in which one or more cell rows are arranged in parallel with the illustrated cells. In that case, it is preferable to provide a vertical rib or the like at the joint between the partition walls of the battery case and the battery case lid, as described above.

[0012]

As described above, according to the present invention, it is possible to obtain a lead-acid battery having a constant quality by eliminating defective adhesion between the battery case and the battery case lid.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a configuration example of a lead storage battery according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing a bonded portion of a battery case and a battery case lid of the battery.

FIG. 3 is an enlarged cross-sectional view in which an adhesive is removed from the same bonded portion.

FIG. 4 is an enlarged cross-sectional view showing another configuration example of a bonding portion between a battery case and a battery case lid.

FIG. 5 is a front view showing a main part of a battery case.

FIG. 6 is an enlarged cross-sectional view showing a bonded portion between a battery case and a battery case lid of a conventional lead storage battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery case 2 Battery case lid 3 Positive electrode plate 4 Separator 5 Negative electrode plate 6, 7 Shelf part 8, 9 Terminal 10 Bushing 11 Filler 12 Recessed part 13 Convex part 14, 17 Rib 15, 16, 18, 19 Vertical rib 20 Adhesive

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroshi Sugiyama 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A concave portion provided on one end face of an opening of a battery case and a lid for sealing the opening of the battery case and a convex part provided on the other end face of the opening are fitted to each other and bonded by an adhesive. A lead storage battery comprising: a plurality of vertical ribs for regulating a distance between the surface of the convex portion and the inner surface of the concave portion on at least one of the inner surface of the concave portion and the surface of the convex portion. Lead acid battery. 2. The lead storage battery according to claim 1, wherein a plurality of ribs for restricting entry of the convex portion into the concave portion are provided on at least one of the bottom surface of the concave portion and the tip of the convex portion.