JP3322792B2 - Lead storage battery - Google Patents

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 A battery case and a lid of a lead storage battery are usually made of synthetic resin. And, as a method of sealing the opening of the battery case with a lid, a structure in which a heat-welding material such as polypropylene and a battery case and a lid are fitted with concave and convex portions,
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 concave portion 23 is provided on the end face of the opening of the battery case 21, and the convex portion 24 that fits into the concave portion 23 is provided on the opening of the battery case cover 22. Then, the adhesive 25 is filled in the concave portion 23 of the battery case 21, the battery case cover 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, as shown in FIG. 6, when the convex portion 24 is biased to one side in the concave portion 23, the adhesive is pushed out 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 is weakened in this portion.

[0003] If there is such a portion where the bonding strength is weak,
The lid is detached when the battery is transported or installed, or even if the lid is not detached, the gas generated during overcharging leaks to the outside, resulting in various adverse effects such as a decrease in the amount of electrolyte. In particular, for sealed lead-acid batteries used for power distribution equipment, substation power supplies, or power supplies for building emergency lighting, the size of the battery case is large. Since there are many shifts, poor adhesion is likely to occur. Further, if the protrusion has a structure in which the protrusion is fitted to the bottom of the recess, no adhesive is interposed between the tip of the protrusion and the bottom of the recess, which is disadvantageous in terms of adhesive strength.

[0004]

[0008] The present invention is fitted to the above view, the convex portion provided in the opening end surface of the recess and the container lid provided in an opening end face of the container, coupled by an adhesive It is an object of the present invention to eliminate poor adhesion due to a protrusion not being located at the center of a recess in a lead-acid battery. The present invention
It is another object of the present invention to provide a lead-acid battery having a high bonding strength by interposing an adhesive between a tip of a convex portion and a bottom of a concave portion.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an opening of a battery case.
In a lead-acid battery formed by fitting a concave portion provided on the end surface and a convex portion provided on the end surface of the opening of the battery case cover for closing the opening portion of the battery case and bonding them with an adhesive, the surface of the convex portion has a convex shape. It is characterized in that a plurality of vertical ribs are provided for regulating the distance between the surface of the portion and the inner surface of the concave portion. Further, the bottom surface of the recess,
Providing a plurality of ribs for restricting the entry into the recess of the convex portion.

[0006]

Embodiments of the present invention will be described below. FIG. 1 shows a configuration 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 the positive electrode plate 3 and the negative electrode plate 5 are alternately stacked via the separator 4 is inserted so as to apply a group pressure in the stacking direction. On the electrode plate group, a shelf 6 to which ears of the positive electrode plate 3 are connected, and a negative electrode plate 5
Are provided, and the shelves 6 and 7 are connected to the positive terminal 8 and the negative terminal 9 by welding, respectively. A ring-shaped lead alloy bushing 10 is integrally formed with the battery case lid 2 bonded to the opening of the battery case 1 with an adhesive at a position corresponding to the positive electrode terminal 8. The bushing 10 and the large diameter portion of the positive electrode terminal 8 are heated and welded by a burner, and a filler 11 is injected to seal the terminal portion. The negative electrode terminal 9 is similarly welded to the bushing and sealed. As for the dimensions of this battery, for example, the width of one cell is about 170 mm, the length in the stacking direction of the electrode plates is about 340 mm, and the height is about 320 mm.

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

The distance between the surface of the projection 13 and the inner surface of the recess 12 can be made constant by these ribs 15 and 16. For this reason, 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 bonded portion between them has uniform adhesive strength over the entire circumference. The ribs 15 and 16 do not need to be provided at the corresponding positions on the outer surface and the inner surface of the convex portion, respectively, but providing them in association is advantageous in positioning the convex portion 13 at the center of the concave portion 12. .

Further, ribs 14 are provided at appropriate intervals on the bottom surface of the concave portion 12 of the battery case 1. The rib 14 has a width of about 2 m
m, the height is about 1 mm, and they are provided at intervals of about 150 mm. Due to the ribs 14, the protrusion 13 does not reach the bottom of the recess 12, so that an adhesive layer having a constant thickness can be interposed between the tip of the protrusion 13 and the bottom of the recess 12. Further, by the action of the ribs 14, a constant gap is formed between one edge of the concave portion 12 of the battery case 1, in the example of FIG. 2, and the corresponding step of the battery case cover 1. . Then, if the protrusion 13 is fitted into the recess 12 filled with the adhesive 20,
The adhesive extruded by the projections 13 enters the gaps and serves to increase the bonding strength. The ribs 14 are preferably provided at positions deviated from the vertical ribs 15 and 16. If these ribs are at the same position,
This is because portions where no adhesive is interposed overlap, and a portion having locally low adhesive strength is formed.

[0010]

In the above embodiment, the battery case is shown as having a one-cell structure. However, a lead-acid battery usually has a structure in which a plurality of cells are connected in the direction of lamination of electrode plates. Needless to say, the present invention is also applied to a battery 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 this case, it is preferable to provide a vertical rib or the like at the joint between the battery case and the battery case cover, similarly to the 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 cover.

[Brief description of the drawings]

FIG. 1 is a longitudinal 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 bonding portion between a battery case and a battery case cover of the battery.

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

FIG. 4 is a front view showing a main part of the battery case.

FIG. 5 is an enlarged cross-sectional view showing a bonding portion between a battery case and a battery case lid of a conventional lead storage battery.

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Sugiyama 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References Japanese Utility Model Sho-61-151256 29793 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01M 2/02-2/08

Claims (2)

(57) [Claims] 1. A concave portion provided on an end face of an opening of a battery case and a concave portion of the battery case.
A lead storage battery which is fitted with a projection provided on an end face of the opening of the battery case lid for sealing the opening, and which is joined by an adhesive,
A lead-acid battery, wherein a plurality of vertical ribs are provided on the surface of the projection to regulate the distance between the surface of the projection and the inner surface of the recess. Wherein the bottom surface of the recess, a lead-acid battery of claim 1, wherein having a plurality of ribs for restricting the entry into the recess of the convex portion.