JP2001236933A - Battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure that can give tolerance in accuracy demanded for dimensions and assembly of components and to reduce defect rate in manufacturing batteries by preventing sealant form creeping into the battery. SOLUTION: An annular elastic body with its upper face having a recessed shape is equipped with diameter larger at the top than the bottom on the lower outer peripheral face, smaller at the top than the bottom on the lower inner peripheral face, diameter of the lowermost part on the inner peripheral face larger than diameter of a pole column, radius of the lowermost part on the outer peripheral face larger than the least distance between the center axis of the polar column and inner wall of a recessed portion, the smallest diameter of the inner peripheral face the same as or smaller than diameter of the polar column, and with the largest width of an elastic annular portion larger than the largest distance between side face of the polar column and the inner wall of the recessed portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a sealing mechanism for a through-pole portion of a lead-acid battery, and reduces a defective rate of the sealing portion during manufacturing.

[0002]

2. Description of the Related Art As one method of sealing a pole pole penetration part of a lead storage battery, a thermosetting resin such as an epoxy resin is sealed in a space at a boundary between a lead pole pole and a concave portion above a pole pole penetration opening. There is a method of filling as an agent and forming a seal at the pole column penetration portion. According to this method, if there is a gap between the pole and the pole post when pouring the plugging agent, a defect that the plugging agent flows into the battery occurs. Therefore, if the diameter of the pole and the diameter of the pole through hole are completely the same so as to eliminate the gap between the pole and the pole through hole, the manufacturing process when joining the battery lid and the battery case is performed. Causes significant trouble. Therefore, in general, the diameter of the pole is made slightly smaller than the diameter of the pole through hole of the battery cover, and the pole is designed so that the pole can easily penetrate the pole through hole. Then, in order to prevent the sealing agent from flowing into the battery case, O is set so as to abut against the pole wall peripheral wall protruding into the concave portion above the pole post through-hole, the bottom of the concave portion above the pole post through-hole, and the inner wall of the concave portion. A ring is attached to prevent the sealant from flowing into the battery.

[0003]

However, in the conventional method, the center line of the pole column in the penetrating direction and the center line of the pole column in the penetrating direction deviate from each other, or the radius of the pole or the pole column through-hole is changed. If the dimension in the direction is different from the design value, the distance between the pole pole peripheral wall and the inner wall of the recessed portion above the pole post opening may be larger or smaller than the design value. If the dimensions of the O-ring mounting portion deviate from the design values in this way, the mounted O-ring may not be securely fitted or the O-ring may not be mounted. Therefore, when the O-ring is used, precise component dimensional accuracy and component assembly accuracy are required, and if the accuracy is rough, a failure that the sealing agent flows into the battery frequently occurs.

SUMMARY OF THE INVENTION The present invention solves the above-described problems and reduces the defective rate during battery manufacturing by providing a structure capable of providing a margin for the accuracy required for component dimensions and component assembly. The purpose is to do so.

[0005]

A battery according to the present invention is a battery in which a ring-shaped elastic body is used for a seal portion. The ring-shaped elastic body has a ring-shaped cross section having a tapered lower portion and a concave upper portion. It is characterized by having a shape that has a tapered shape at the bottom in this way, making it easy to mount even if the interval is narrow, and by having a shape with a recess at the top, Even in the case of pushing into the narrow space, the width of the ring portion is reduced by closing the recess, so that it is possible to push with a small force, and mounting failure of the annular elastic body is suppressed.

In particular, the battery cover has a concave portion provided with a pole column through hole at the bottom, and an annular elastic body is passed through the pole column so as to be in close contact with the peripheral wall of the pole column, the bottom of the concave portion, and the inner wall of the concave portion. And, comprising a sealing agent filled on the upper side of the annular elastic body in the recess,
In the case of a lead-acid battery in which the gap between the pole and the pole-post inserted through the pole-post is closed by the annular elastic body and the sealing agent, the seal of the pole-post penetration of the lead-acid battery is provided. When used for a mechanism, as a ring-shaped elastic body, the lower outer peripheral surface has a larger diameter at the upper part than the lower part, the lower inner peripheral surface has a smaller diameter at the upper part than the lower part, and the diameter of the lowermost part of the inner peripheral surface is a pole. The diameter of the lowermost part of the outer peripheral surface is smaller than the minimum distance between the central axis of the pole and the inner wall of the recess, the minimum diameter of the inner peripheral surface is the same as or smaller than the diameter of the pole, It is preferable that the maximum width of the ring portion is larger than the maximum distance between the peripheral wall of the pole and the inner wall of the concave portion, and that the upper surface thereof is depressed.

In such a lead-acid battery, the diameter of the lower outer peripheral surface is larger in the upper part than the lower part, the diameter of the lower inner peripheral surface is smaller in the upper part than the lower part, and the diameter of the lowermost part of the inner peripheral surface is the diameter of the pole. Larger, the radius of the lowermost part of the outer peripheral surface is smaller than the minimum distance between the central axis of the pole and the inner wall of the recess, so that an annular elastic body is used. It is easy to insert up to the position where it comes into close contact with the bottom of the recess. In addition, the minimum diameter of the inner peripheral surface of the annular elastic body is equal to or smaller than the diameter of the pole, and the maximum width of the elastic body ring is larger than the maximum distance between the pole wall peripheral wall and the recess inner wall. Therefore, no gap is formed between the annular elastic body and the peripheral wall of the pole and the inner wall of the recess, so that the sealing agent does not flow into the battery when the sealing agent is filled above the annular elastic body in the recess.

Further, since the upper surface of the annular elastic body is depressed, the gap between the pole wall and the inner wall of the recess becomes smaller than designed due to variations during assembly and variations in component dimensions. In addition, since the elastic annular body is deformed with a small force in the width direction, the elastic annular body can be easily and reliably passed through the pole so as to be in close contact with the pole pole peripheral wall, the bottom of the recess, and the inner wall of the recess, and the gap due to a poor assembly can be obtained. Is prevented, and the sealing agent does not flow into the battery. And from such a thing, this lead storage battery becomes a battery with a small defective rate at the time of manufacture.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The material constituting the annular elastic body used in the battery of the present invention may be any material having elasticity, but has a type A durometer hardness in the range of 35 to 80. Ethylene / propylene /
It is preferable to use a rubber belonging to any of diene monomer rubber and fluoro rubber. This is because such a material is excellent in heat resistance performance, and in terms of hardness, in relation to having a recess at the top,
If it is less than 35, it is too soft and the sealing effect is reduced.
If it is more than 0, it is too hard and the sealing effect is reduced, so that the mounting property is deteriorated.

Further, such a material is excellent in acid resistance performance, and is particularly suitable as a material constituting an annular elastic body used in a lead storage battery.

The dimensions of each part of the annular elastic body used in the battery of the present invention are defined as the radial width of the lowermost part of the annular elastic body (the difference between the radius of the lowermost part of the inner peripheral surface and the radius of the lowermost part of the outer peripheral surface). The larger the maximum width of the elastic ring (corresponding to the difference between the maximum radius of the outer peripheral surface of the elastic body and the minimum radius of the peripheral surface of the elastic body), the better. However, depending on the shape of the mounting portion, if the size is too small, the mountability may be impaired. If the size is too large, the mountability may be deteriorated.

Similarly, in the case where an annular elastic body is used for the sealing mechanism of the above-described lead-acid battery pole post penetrating portion, the radial width of the lowermost portion of the annular elastic body (the radius of the lowermost portion of the inner peripheral surface is different from that of the innermost surface). The size of the part formed by the difference with the radius of the lowermost part of the outer peripheral surface) is smaller than the distance between the pole wall peripheral wall and the inner wall of the recessed part at the top of the pole through hole, so that the mounting property is improved. Basically, the smaller the width, the better. However, depending on the shape of the pole post, if it is too small, the mountability may be impaired. Also, the larger the maximum width of the elastic ring (corresponding to the difference between the maximum radius of the outer peripheral surface of the elastic body and the minimum radius of the inner peripheral surface of the elastic body), the greater the effect of stopping the sealing agent, but the larger the larger, the worse the fit. I do. Therefore, it is appropriately selected in consideration of these.

Further, since the annular elastic body of the present invention has a shape in which the upper surface is depressed (when viewed in a radial cross section, it has a concave portion in the upper portion), When a compressive force is applied to the elastic body, the elastic body deforms so that the dent closes with a small force, and the mounting properties are better than those with no dent, but the depth of this dent is Preferably, the height of the annular elastic body is 1/3 to 1/4 of its height, and its cross-sectional shape is preferably V-shaped or substantially V-shaped. And, more preferably, the sectional shape is V
It is preferable that the shape is a V-shape or a substantially V-shape, and the depth thereof is 1/3 to 1/4 of the height of the annular elastic body. In particular, such a size and shape are preferable when the annular elastic body is used for the sealing mechanism of the lead-acid battery pole column penetration portion as described above.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the drawings in comparison with the embodiments of the prior art.

FIG. 1 is a cross-sectional view showing an example of a pole column structure of a lead-acid battery according to the present invention. The pole 1 is penetrated so that the pole hole 3 of the battery cover 2 and the center line 4 in the penetrating direction overlap with each other, and the inner wall 5 of the concave portion above the pole hole 3 and the pole 1
A ring-shaped elastic body 7 made of rubber having a material of ethylene-propylene-diene-monomer and having a type A durometer hardness of 50 is mounted between the peripheral wall 6 and the epoxy resin 8 poured into the upper part thereof, and this is cured. It is a structure that was given.

FIG. 2 is an enlarged view of a radial cross-sectional shape of the elastic ring portion of the annular elastic member 7. The length of the dimension A is の of the distance between the inner wall 5 and the peripheral wall 6 shown in FIG. 1, and the length of the dimension B is 1.5 times the distance between the inner wall 5 and the peripheral wall 6 shown in FIG. The length of the dimension C is １ ／ of the length of the dimension D. The length of the dimension D is substantially equal to the distance between the inner wall 5 and the peripheral wall 6 shown in FIG. Note that the difference between the radius of the pole post 3 and the radius of the pole 1 is smaller than 0.5 times the interval between the inner wall 5 and the peripheral wall 6.

FIG. 3 is a cross-sectional view showing an example of the structure of a pole-pole penetrating portion of a conventional lead-acid battery assembled in such a manner that center lines 14 and 4 of the pole column 1 and the pole-column opening 3 in the penetrating direction are shifted. Pole 1
The pole 1 penetrates the pole post 3 in a state where the center line 14 in the penetrating direction and the center line 4 in the penetrating direction of the pole post 3 are displaced. Such a condition often occurs during mass production. In this case, a narrow portion and a wide portion are formed in the interval between the peripheral wall 6 of the pole 1 and the inner wall 5 of the recessed portion above the pole post 3.
The O-ring 9 cannot be completely mounted in a portion with a small interval, and the fitting is insufficient in a portion with a large interval. For this reason, it is impossible to prevent the epoxy resin 8 from flowing into the battery when the epoxy resin 8 is injected into the concave portion above the pole column through-hole 3.

FIG. 4 shows a center line 1 of the pole 1 and the pole through hole 3.
It is sectional drawing which shows the pole column penetration part structure of the lead storage battery of a present Example assembled by deviating 4,4. Regarding the displacement, the situation is exactly the same as that shown in FIG. 3, and the shape of the annular elastic body is different from the conventional one. In the lead storage battery of the present embodiment, even in such a state, the annular elastic body 7 has a narrow portion and a wide portion between the peripheral wall 6 of the pole 1 and the inner wall 5 of the recessed portion above the pole post 3. Therefore, the epoxy resin is prevented from flowing into the battery when the epoxy resin is injected into the recess at the upper portion of the pole post opening 3.

Table 1 shows the failure of the epoxy resin to flow into the battery when the epoxy resin is injected into the recessed portion above the through hole of the pole, and shows a comparison between the conventional product and the product of the present invention at the time of mass production trial production. This shows the difference in the defect rate. As a result of trial production of 200 pieces, the defect rate of the conventional product was 4%, whereas that of the product of the present invention was 0%.

[0020]

[Table 1]

[0021]

According to the lead storage battery of the present invention, even if the dimensions of components and the accuracy in assembling the components are deviated, the rejection rate in manufacturing is significantly reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a pole column penetration part structure of a lead storage battery according to the present invention.

FIG. 2 is an enlarged view of a radial cross-sectional shape of an elastic body ring portion of an annular elastic body 7;

FIG. 3 is a cross-sectional view showing the structure of a pole pillar penetration portion of a conventional lead-acid battery assembled with a center line shifted.

FIG. 4 is a cross-sectional view showing a pole-column penetrating portion structure of the lead storage battery of the present embodiment assembled with the center line shifted.

[Explanation of symbols]

 1. Pole 2. Battery cover 3. Pole through-hole 5. 5. Inner wall of recess 6. Peripheral wall of pole column Ring elastic body 8. Epoxy resin

Claims (2)

[Claims] 1. A battery in which a ring-shaped elastic body is used for a seal portion, wherein the ring-shaped elastic body has a ring-shaped cross-sectional shape having a tapered lower portion and a recessed upper portion. Battery. 2. The material of the annular elastic body is 35 to 80.
The battery according to claim 1, wherein the battery is selected from rubbers belonging to any of ethylene-propylene-diene-monomer rubber and fluorine rubber having a type A durometer hardness in the range of: