JPH05159764A - Sp4all sealed lead-acid battery - Google Patents

Abstract

PURPOSE:To prevent oil perfectly from seeping in a battery surface and also an outflow of an electrolyte by coating the total parts, where the oil tends to crawl up to the outside, with liquid absorbing paper. CONSTITUTION:A wall surface 14 is provided in the peripheral edge of a rubber-made exhaust valve 3 mounted to a valve unit part 2a of a center cover 2. Oil is applied between the valve 3 and the valve unit part 2a in order to complete stable valve opening and holding of air-tightness. A plane part 5 is provided in the upper part of the wall surface 4, a rib 6 is provided in a peripheral edge part of the plane part 5, to form a corner part 12 of bringing the plane part 5 into contact with an internal wall 6a of this rib 6 into a curved surface, and a plurality of protrusive parts 7a are provided on the plane part 5 so as to prevent contact with the rib internal wall 6a. For perfectly sucking oil accumulated in the corner part 12, liquid absorbing paper 8 in dimension equal to or a little larger than the internal dimension AXB is mounted so as to closely touch the plane part 5. Thickness of the paper 8 is set a little larger than height of the protrusive part 7a, a cover 10 of plane dimension equal to the paper 8 is inserted to a recessed part surrounded by the rib internal wall surface 6a, and an upper surface of the paper 10 is compressed to secure an energy director 10b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small sealed lead acid battery.

[0002]

2. Description of the Related Art A conventional small sealed lead acid battery will be described with reference to the drawings. In FIG. 4, 1 is a battery case, 2 is an inner lid, and an exhaust valve 3 is provided on the inner lid 2, and the exhaust valve 3 releases gas generated from the inside of the battery to the outside during charging. Prevents the inflow of oxygen from the outside when left as it is. The exhaust valve 3 is made of rubber and is attached to the valve body portion 2a of the inner lid 2. However, a stable valve opening and airtightness are completely maintained between the exhaust valve 3 and the valve body portion 2a. Oil is applied to prevent this. The exhaust valve 3 has a wall surface 4 on the periphery thereof, and a flat surface portion 5 is provided on the upper portion of the wall surface 4, and a rib 6 is provided on the outer peripheral edge of the flat surface portion 5, and an inner wall surface 6a of the rib is formed. A plurality of convex portions 7 opposed to each other in the longitudinal direction of the inner wall surface 6a are provided on the inner flat surface portion 5 and one end of which has a rib inner wall surface 6
It was provided in contact with a. When gas is generated during charging, a part of the oil that oozes out from the exhaust valve 3 comes into contact with the inner wall surface 6a of the inner lid 2, particularly the inner wall surface 6a of the rib, and the flat portion 5.
It is easy to collect in the corner portion 12 where the inner wall surface 6a of the rib and the upper surface of the convex portion 7 are in contact with each other. When the upper lid 10 is attached and fixed to the inner lid 2, the collected oil rushes to the upper portion due to a capillary phenomenon from the gap between the inner lid 2 and the upper lid 10, and the oil oozes out on the upper surface of the upper lid 10 to cause a poor appearance. It was. In order to prevent this, the liquid absorbent paper 8 is mounted on the flat surface portion 5 of the inner lid 2. As shown in the figure, the shape of the liquid-absorbent paper 8 is such that the outer dimensions are within the inner dimensions A and B between the ribs 6 of the inner lid 2 so as not to ride on the upper portion of the convex portion 7 of the inner lid 2. The notch 9 is provided in the through hole 10a, and the through hole 10a is provided so as not to hit the exhaust valve 3. The plate thickness of the liquid-absorbent paper 8 was set to be slightly thicker than the height of the convex portion 7 of the inner lid 2. Further, on the liquid-absorbent paper 8, an upper lid 1 having the same external dimensions as the liquid-absorbent paper 8 is also provided.
The back surface of the upper lid 10 was brought into contact with the upper surface of the convex portion 7 of the inner lid 2, and 0 was fixed by using a method such as ultrasonic welding.

[0003]

In such a conventional structure, the oil remaining on the corner portion 11 where the inner wall surface 6a of the rib of the inner lid 2 and the flat surface portion 5 are in contact with each other, the oil on the flat surface portion 5, etc. Was prevented from being sucked out by the absorbent paper 8 and oozing out to the outside, but the inner wall surface 6 of the rib of the inner lid 2 was prevented.
The oil accumulated in the corner portion 12 where a and the upper surface of the convex portion 7 are in contact with each other may be sucked by the liquid-absorbent paper 8. However, depending on the amount of oil, part of the oil may partially come into contact with the inner lid 2 and the upper lid 10.
It was not possible to completely prevent the oil from leaching on the upper surface of the upper lid 10 due to the capillary phenomenon from the gap between the upper part and the upper part.

The present invention solves such a problem, and provides a small sealed lead-acid battery that completely prevents oil from seeping out to the upper surface of the upper lid and at the same time prevents the risk of electrolyte leakage. To aim.

[0005]

In order to solve this problem, a small sealed lead-acid battery of the present invention is provided with a plurality of exhaust valves in the upper part of a battery case accommodating a power generating element, and a wall surface is provided around the exhaust valves. , A flat portion is provided on the upper portion of the wall surface, ribs are provided on the outer peripheral edge portion of the flat portion, and a plurality of convex portions are provided on the flat portion so as not to contact the inner wall surface of the rib, and the exhaust valve is A plurality of through holes provided so as not to hit and a plurality of through holes for the convex portions penetrating the convex portion are provided, and are brought into close contact with the flat surface portion and abutted on the inner wall surface of the rib. The absorbent paper that is a little thicker than the height and the upper surface of the absorbent paper,
An upper lid that is in contact with the inner wall surface of the rib and is fixed in contact with the convex portion is provided.

[0006]

In this configuration, the inner wall surface of the rib of the inner lid where the oil is likely to collect and the flat portion have a curved corner portion, and the absorbent paper is strongly abutted to the corner portion. A thickness that is slightly thicker than the height of the protrusion so that it sticks to the back surface of the lid, and an external dimension that is the same as or slightly smaller than the internal dimension of the recess surrounded by the inner wall surface of the rib, and the planar dimension of the protrusion. Install a liquid absorbing paper with a slightly larger protrusion through hole size, so that oil is absorbed by the liquid absorbing paper before bleeding to the outside, and the protrusion should not touch the inner wall surface of the rib. Since it is provided on the flat surface portion, there is no corner portion where the inner wall surface of the rib and the upper surface portion of the convex portion contact with each other, which has been a problem in the related art, and it is possible to completely prevent the oil from oozing out to the upper surface of the upper lid.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A small sealed lead acid battery according to an embodiment of the present invention will be described below with reference to the drawings. The same components as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, the valve body portion 2a of the inner lid 2
A wall surface 4 is provided on the periphery of the exhaust valve 3 made of rubber attached to the. Oil is applied between the exhaust valve 3 and the valve body 2a in order to ensure stable valve opening and airtightness. A flat surface portion 5 is provided on an upper portion of the wall surface 4, a rib 6 is provided on an outer peripheral edge portion of the flat surface portion 5, and a corner portion 12 where the inner wall 6a of the rib and the flat surface portion 5 are in contact with each other is a curved surface. A plurality of convex portions 7a opposed to each other in the longitudinal direction of the inner wall 6a of the rib are provided on the flat surface portion 5 so as not to contact the inner wall 6a of the rib.

By providing the convex portion 7a at this position,
Only the corner portion 12 where the inner wall 6a of the rib and the flat surface portion 5 are in contact with each other has a risk of oil bleeding directly to the outside. Therefore, if the oil accumulated in the corner portion 12 is completely absorbed, the oil can be prevented from oozing out.
Therefore, the outer dimension of the liquid-absorbent paper 8 is set to the inner dimension A × between the ribs 6.
The dimension of the through hole 9a of the convex portion of the liquid-absorbent paper 8 can be press-fitted into the convex portion 7a so that it is the same as or slightly smaller than the dimension of A × B which is almost in the range of B. The size is made slightly larger, and the liquid absorbing paper 8 is attached so as to be in close contact with the flat surface portion 5. Thereby, the oil in the corner portion 12 can be absorbed by the liquid absorbing paper 8. Also, liquid-absorbent paper 8
Is slightly thicker than the height of the convex portion 7a, and the upper lid 10 having the same plane size as the liquid-absorbent paper 8 is inserted into the concave portion surrounded by the inner wall surface 6a of the rib so as to contact the inner wall surface 6a of the rib, The energy director 10b provided on the upper surface of the convex portion 7a and the back surface of the upper lid 10 abut on each other so as to slightly compress the upper surface of the liquid-absorbent paper 8, and the energy director 10b is fixed by ultrasonic welding.

In FIG. 3 showing the cross section in this state, since the corner portion 12 has a curved surface, the liquid-absorbent paper 8 can be firmly adhered by pressing the corner portion 12 at the bottom of the outermost periphery thereof, so that the oil is absorbed. Can be easily formed and the convex portion 7
a corner portion 12 where the flat surface 5 and the upper surface of a or the convex portion 7a contact
Since the oil collected in a is also absorbed by the liquid absorbing paper 8, it is possible to completely prevent the oil from rising to the outside and causing a poor appearance.

[0011]

As is apparent from the above description of the embodiments, according to the small sealed lead-acid battery of the present invention, the oil covers all the places that are likely to rise to the outside with the absorbent paper, so that the oil is It is possible to completely prevent the battery from seeping out to the surface of the battery, and at the same time, to prevent the danger due to the outflow of the electrolytic solution, and it is possible to provide a small sealed lead acid battery with a beautiful appearance.

[Brief description of drawings]

FIG. 1 is a perspective view showing an exploded configuration of a main part of a small sealed lead acid battery according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a completed storage battery of the same.

FIG. 3 is a sectional view showing a CC section of FIG.

FIG. 4 is an exploded perspective view showing a configuration of a main part of a conventional small sealed lead acid battery.

[Explanation of symbols]

 1 Battery case 2 Middle lid 3 Exhaust valve 4 Wall surface 5 Flat surface 6 Rib 6a Inner wall surface of rib 7a Convex portion 8 Liquid absorbing paper 9a Convex through hole 10 Upper lid 10a Through hole

Claims (3)

[Claims] 1. A plurality of exhaust valves are provided on an upper part of a battery case accommodating a power generation element, a wall surface is provided around the exhaust valves, and a flat surface portion is provided on an upper surface of the wall surface, and an outer peripheral edge portion of the flat surface portion is provided. A rib is provided, and an inner lid provided with a plurality of convex portions so as not to contact the inner wall surface of the rib on the flat surface portion, a plurality of through holes provided so that the exhaust valve does not hit, and the convex portion are penetrated. A plurality of through-holes for the convex portions are provided, which are brought into close contact with the flat surface portion, and abutted against the inner wall surface of the rib, which is a little thicker than the height of the convex portions, and is brought into close contact with the upper surface of the liquid absorbent paper. A small sealed lead-acid battery having an upper lid that is in contact with the inner wall surface of the rib and is fixed in contact with the convex portion. 2. The outer dimensions of the liquid-absorbent paper and the upper lid are the same as or slightly smaller than the inner size of the recess surrounded by the ribs, and are sizes that can be press-fitted into the recesses surrounded by the ribs. Small sealed lead acid battery. 3. The small sealed lead acid battery according to claim 1, wherein the size of the through hole of the convex portion of the liquid absorbent paper is the same as or slightly larger than the plane size of the convex portion that can penetrate the convex portion.