JP2000100419A - Lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lead-acid battery capable of integrating a terminal with a lid simply without using a resin or an adhesive, and having an excellent liquid-tight structure. SOLUTION: A columnar pole post 4 standing out from a strap 3 is inserted into a perforated hole 2b of a lid 2, to seal the lid 2 with the pole post 4 liquid- tightly. In this case, the pole post 4 has an upward stepped surface 4c on the peripheral surface, and protrusions 4d are formed on the stepped surface 4c. A sleeve 2c is formed around the perforated hole 2b on the reverse side of the lid 2, and grooves 2d are formed on the under surface of the sleeve 2c. Then, the protrusions 4d are fitted into the grooves 2d, to liquid-tightly seal the lid 2 with the pole post 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for a lead storage battery lid and a pole.

[0002]

2. Description of the Related Art As a structure for sealing a lid and a pole of a lead storage battery, for example, as shown in FIG. 5, a plurality of annular flanges 7 are formed around a cylindrical pole 6 and the flange 7 is formed. In some cases, a resin part 8 is mounted around the circumference, an annular sleeve 11 is formed around the pole pillar through hole 10 on the back surface of the lid 9, and the upper surface of the resin part 8 and the lower surface of the sleeve 11 are heat-welded. 2 or 3 of Japanese Patent Publication No. 51-14138.
In the figure, a protruding flange is formed on the peripheral surface of the pole, and the tip of the protruding flange is inserted into an annular concave groove formed on the back surface of the lid and embedded and fixed in an adhesive filled in the groove. It is shown.

[0003]

In the former structure described in the prior art, it is necessary to mount a resin around the poles, which increases the number of steps, requires equipment and resin, and is difficult because the mounting operation is difficult. There was a problem that a good product was generated. In the latter, since an adhesive is used, the cost of the material and the steps and equipment for curing the adhesive are required. Therefore, both of them have a problem that the material cost and the equipment cost increase, the process becomes complicated, and the cost cannot be reduced.

The present invention has been made in view of the above problems, and has as its object to have a liquid-tight structure that can integrate a terminal and a lid by a simple method without using a resin or an adhesive. It is to provide a lead storage battery.

[0005]

In order to solve the above-mentioned problems, the present invention provides a method in which a pole-shaped pole 4 standing upright from a strap 3 is inserted into a through hole 2b of a lid 2 so that the lid 2 and the pole 4 are connected to each other. In the lead-acid battery sealed in a liquid-tight manner, the pole 4 has an upward step surface 4c on the peripheral surface, and the protrusion 4d is formed on the step surface 4c.
The cover 2 has a sleeve 2c formed around the through hole 2b on the back surface thereof.
c, a groove 2d is formed on the lower surface thereof, and the lid 2 and the pole 4 are formed such that the protrusion 4d of the stepped surface 4c is
c, which is fitted in the groove 2d and is liquid-tightly sealed.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a cross-sectional view of a main part showing an embodiment of the present invention, wherein 1 is a polypropylene battery case, 2 is a polypropylene cover, and 3 is an upper part of the pole group. The formed strap 4 is a cylindrical pole.

The pole 4 is composed of a small-diameter cylindrical portion 4a and a large-diameter cylindrical portion 4b, the lower surface of the cylindrical portion 4a and the cylindrical portion 4b.
And the upper surface of the pole is integrated so that the center lines of the poles coincide with each other, and the outer surface of the integrated portion, that is, the peripheral surface of the pole has an upward step surface 4c. Further, two annular protrusions 4d are formed on the step surface 4c.

The lid 2 has a box shape with an opening on the lower side, and a through hole 2b is formed in a part of the ceiling wall 2a.
An annular sleeve 2c is provided around the lower part of the through hole 2b on the back surface of the lid (the lower surface in FIG. 1). The sleeve 2c
In the lower surface, two annular grooves 2d are formed so as to surround the through holes 2b.

The pole 4 has a cylindrical portion 4a formed in the through-hole 2.
b, the tip protrudes from the upper surface of the ceiling wall 2a, the projection 4d of the step surface 4c is fitted into the groove 2d of the sleeve 2c, and the lower part of the cylindrical portion 4b is connected to the strap 3.

The side wall 2e of the lid 2 is composed of an outer wall 21 and an inner wall 22 and is connected at an intermediate portion thereof. The lower surface of the inner wall 22 is thermally welded to the upper edge of the battery case 1. .

(Embodiment 2) FIG. 2 is a cross-sectional view of a principal part showing another embodiment of the present invention, and the same reference numerals as in FIG. 1 denote the same names.

This embodiment is the same as the first embodiment except that the shape of the pole 4 is different. That is,
The pole 4 of the present embodiment includes a small-diameter cylindrical portion 4a, a large-diameter cylindrical portion 4b, a medium-diameter cylindrical portion 4e having an intermediate diameter between the cylindrical portions 4a and 4b, and a pedestal 4f. Become. The column portions 4a, 4b, and 4e are integrally connected in this order from above, and the pedestal 4f is connected to a lower portion of the column portion 4e. The pedestal 4 f is connected to the upper surface of the strap 3.

As described above, when the large-diameter cylindrical portion 4d that is in close contact with the sleeve 2c has a large diameter, and the medium-diameter cylindrical portion 4e connected to the strap has a small diameter, the contact portion becomes large and the volume of the cylindrical portion becomes small. Therefore, the adhesiveness is excellent and the material of the pole can be saved.

Next, the manufacturing method of the first embodiment will be described with reference to FIGS.

First, the battery case 1 of the first embodiment and the sleeve 2
c Prepare a lid 2 in which the groove 2d is not formed on the lower surface, and a pole group in which the strap 3 and the pole 4 are formed by a COS molding method.

Next, the electrode group is housed in a battery case, and a hot plate 5 for melting the cover 2 and the battery case 1 between the cover 2 and the battery case 1 as shown in FIG.
Place. The hot plate 5 has a concave portion 5a on the lower surface in which the upper portion of the pole 4 is fitted, and a convex portion 5b on the upper surface corresponding to the concave portion 5a, which has a contour of the pole column 4b including the step surface 4c.
And a notch 5c that avoids the outer wall 21 of the lid.

Next, as shown in FIG. 3, the projection 5d formed on the upper surface of the convex portion 5b of the hot plate 5 is applied to the lower surface of the sleeve 2c of the lid 2, and then the upper edge of the battery case 1 is applied to the lower surface of the hot plate. Press in the direction of the arrow. Then, as shown in FIG. 4, the lower surface of the sleeve 2c is melted, and the protrusion 5d bites,
The lower surface of the inner wall 22 of the lid and the upper edge of the battery case melt.

Then, the hot plate 5 is immediately removed from between the battery case 1 and the cover 2, the cover is brought close to the battery case, and the pole column 4a is inserted into the through hole 2b of the cover to form the protrusion 2c. The protrusion 4d of the pole is inserted into the groove 2d on the lower surface of the sleeve 2c, and the lower surface of the inner wall 22 of the lid and the upper edge of the battery case are overlapped, and both are thermally welded and cured. This way,
The step surface 4c of the pole and the sleeve 2c are joined in a liquid-tight manner,
At the same time, the lid and the battery case are joined to obtain a lead storage battery having a terminal structure as shown in FIG.

In this embodiment, the protrusion 4d of the pole 4 is used.
Is annular, but a part of the annular shape may be cut out, in which case there is an effect of preventing rotation.
In the manufacturing method, the projection 5d is provided on the upper surface of the hot plate, but the projection 5d may not be provided. In this case, the lower surface of the sleeve 2c is uniformly melted, and the groove 4d is formed by pushing the projection 4d of the pole 4 into this surface. This has the effect of preventing the accumulation of resin residue between the projections 5d, as compared with the case where a hot plate provided with the projections 5d is used.

Further, in this embodiment, the upper peripheral surface of the pole 4 is covered with the sleeve 2c. On the contrary, the lower peripheral surface of the sleeve 2c is covered with the projection 4d outside the pole. With such a structure, when a soft resin is pressed during manufacturing, the resin does not escape to the outside and has excellent adhesion. If the height of the pole is made as small as possible and the diameter of the step surface is made large, a battery having a low height and a large contact portion between the lid and the pole and having excellent liquid tightness can be obtained.

[0022]

As described above, according to the present invention, when the battery case and the lid are joined, the lid and the pole can be joined in a liquid-tight manner without using a resin or an adhesive. This eliminates the need for a resin winding step and its equipment, and an adhesive bonding step and its equipment using an adhesive, thereby providing a lead storage battery with low manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state before melting a battery case and a lid in the manufacturing method of the first embodiment.

FIG. 4 is a cross-sectional view showing a state where the battery case and the lid are melted in the manufacturing method of the first embodiment.

FIG. 5 is a sectional view of a main part showing one embodiment of the related art.

[Explanation of symbols]

 2 lid 2b through hole 2c sleeve 2d groove 3 strap 4 pole 4c step surface 4d step surface protrusion

Claims (1)

[Claims] 1. A lead-acid battery in which a pole-shaped pole standing upright from a strap is inserted into a through-hole of a lid, and the lid and the pole are sealed in a liquid-tight manner. It has a stepped surface, a protrusion is formed on the stepped surface, the lid has a sleeve formed around the through hole on the back surface, a groove is formed on the lower surface of the sleeve, The lead storage battery, wherein the lid and the pole are formed such that the protrusion of the step surface is fitted in the groove of the sleeve and is sealed in a liquid-tight manner.