JP3006242B2 - Small sealed lead acid 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 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 a middle lid, and the middle lid 2 is provided with an exhaust valve 3, which discharges gas generated from inside the battery to the outside during charging, Prevents inflow of oxygen from outside when left naturally. The exhaust valve 3 is made of rubber and is mounted on the valve body 2a of the inner lid 2. Between the exhaust valve 3 and the valve body 2a, a stable valve opening and airtight maintenance are completely maintained. Oil is applied to clean The exhaust valve 3 has a wall 4 at its peripheral edge, and has a flat portion 5 on the upper portion of the wall 4. A rib 6 is provided on the outer peripheral edge of the flat portion 5. A plurality of convex portions 7 facing the longitudinal direction of the inner wall surface 6a are formed on the inner flat surface portion 5 at one end thereof by the inner wall surface 6 of the rib.
a. At the time of gas generation during charging, a part of the oil oozing out of the exhaust valve 3 is turned into a corner 11 where the inner wall 6 a of the inner lid 2, particularly the inner wall surface 6 a of the rib, and the flat portion 5 are in contact with each other.
And the corner 12 where the inner wall surface 6a of the rib and the upper surface of the projection 7 are in contact with each other. When the upper lid 10 is attached and fixed to the inner lid 2, the accumulated oil goes up to the upper part by a capillary phenomenon from a gap between the inner lid 2 and the upper lid 10, and the oil oozes on the upper surface of the upper lid 10, resulting in poor appearance. It was. In order to prevent this, the liquid absorbing paper 8 is mounted on the flat part 5 of the inner lid 2. As shown in the figure, the shape of the liquid absorbing paper 8 is such that the outer dimensions are almost the same as the inner dimensions A and B between the ribs 6 of the middle lid 2, and do not climb over the convex portions 7 of the middle lid 2. The notch 9 is provided and the through hole 10a is provided so that the exhaust valve 3 does not hit. The thickness of the liquid absorbing paper 8 was slightly larger than the height of the convex portion 7 of the inner lid 2. Then, the upper lid 1 having the same external dimensions as the liquid absorbent paper 8 is further placed on the liquid absorbent paper 8.
No. 0, the back surface of the upper lid 10 was in contact with the upper surface of the convex portion 7 of the inner lid 2, and this portion was fixed 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 cover 2 contacts the flat portion 5 and the oil on the flat portion 5 are not used. Was absorbed by the absorbent paper 8 and prevented from oozing out, but the inner wall 6
The oil accumulated in the corner portion 12 where the a and the upper surface of the convex portion 7 are in contact with each other may be absorbed by the liquid absorbing paper 8. However, depending on the amount of oil, a part of the oil is collected by the middle lid 2 and the upper lid 10.
It was not possible to completely prevent oil from oozing on the upper surface of the upper lid 10 due to capillary action due to the capillary phenomenon.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a small sealed lead-acid battery which completely prevents oil from oozing to the upper surface of the upper lid and also prevents danger caused by leakage of electrolyte. Aim.

[0005]

In order to solve this problem, a small sealed lead-acid battery according to the present invention is provided with an exhaust valve corresponding to each power generating element above a battery case accommodating the power generating element. An inner lid provided with a wall surface, a flat portion provided on an upper portion of the wall surface, a rib provided on an outer peripheral edge of the flat portion, and a plurality of convex portions provided on the flat surface portion so as not to contact an inner wall surface of the rib, A through hole is provided at a position corresponding to the projection and the exhaust valve.
Put the absorbent paper thicker than the height of the convex part
Closely contact the flat surface of the inner lid so that it contacts the ribs
The upper lid is in close contact with the upper surface of the absorbent paper, and the
Is provided so that it contacts the ribs on the outer edge of the middle lid.
Has a structure in which it is abutted and fixed by a protrusion provided on the inner lid.
You.

[0006]

[Action] In this configuration, the corner portion in contact with the inner wall surface and the flat portion of the lid in which the oil is likely reservoir ribs and a curved surface, is strongly abutted against the liquid-absorbing sheet in the corner portion, further, the planar portion of the middle lid intake The thickness of the liquid-absorbing paper should be slightly larger than the height of the convex part, and the same as the internal dimensions of the concave part surrounded by the inner wall surface of the rib so that the liquid-absorbing paper is in close contact with the back part of the upper lid via the liquid paper. Since the liquid absorbing paper having the slightly smaller outer dimensions and the size of the through hole of the convex part which is the same as or slightly larger than the convex part is mounted, the oil is absorbed by the liquid absorbing paper before the oil oozes out, In addition, since the convex portion is provided on the flat portion so as not to contact the inner wall surface of the rib, the corner portion where the inner wall surface of the rib and the upper surface portion of the convex portion, which has conventionally been a problem, disappears , and the upper lid has an upper surface. Ru can prevent the seepage of oil.

[0007]

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

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

By providing the projection 7a at this position,
The location where there is a risk of oil oozing directly to the outside is only the corner portion 12 where the inner wall 6a of the rib and the flat portion 5 are in contact. Therefore, if the oil accumulated in the corner portion 12 is completely sucked, the oozing of the oil to the outside can be prevented.
For this purpose, the outer dimensions of the liquid-absorbing paper 8 are set to the inner dimensions A ×
The dimensions are the same as or slightly smaller than the dimension of A × B which is just below B, and the dimensions of the through-hole 9a of the convex part of the liquid absorbing paper 8 are the same as the plane dimensions of the convex part 7a which can be pressed into the convex part 7a. The liquid absorbing paper 8 is set to have a slightly larger size, and is mounted so as to be in close contact with the flat portion 5. Thus, the oil in the corner portion 12 can be absorbed by the liquid absorbing paper 8. Also, the 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 absorbing paper 8 is inserted into the concave portion surrounded by the inner wall surface 6a of the rib to abut on the inner wall surface 6a of the rib, Liquid absorbing paper 8
The upper surface of the projection 7a and the upper lid 1 are slightly compressed so that the upper surface of the
The energy director 10b provided on the back surface of No. 0 contacts, and the energy director 10b is fixed by ultrasonic welding.

In FIG. 3 showing a cross section in this state, since the corner portion 12 is a curved surface, the liquid absorbing paper 8 can be strongly adhered so as to press the corner portion 12 at the lower part of the outermost periphery, so that oil is absorbed. Can be easily formed, and the protrusion 7
corner portion 12 where the upper surface or the convex portion 7a of the “a” contacts the flat portion 5
Since the oil accumulated in a is also absorbed by the liquid absorbing paper 8, it is possible to completely prevent the oil from entering the outside and causing poor appearance.

[0011]

As is apparent from the above description of the embodiment, according to the small sealed lead-acid battery of the present invention, the oil covers all the places where the oil is likely to go to the outside with the absorbent paper. Bleeding onto the battery surface can be completely prevented, and at the same time, danger due to the outflow of the electrolyte can be prevented, so that a small sealed lead storage battery with a beautiful appearance can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a 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 battery of the storage battery.

FIG. 3 is a cross-sectional view showing a cross section taken along the line CC of FIG. 2;

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery case 2 Middle lid 3 Exhaust valve 4 Wall surface 5 Flat part 6 Rib 6a Inner wall surface of rib 7a Convex part 8 Absorbent paper 9a Through-hole of convex part 10 Top lid 10a Through-hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01M 2/04 H01M 2/12 H01M 10/06

Claims (2)

(57) [Claims] 1. Each power generation element is placed on an upper part of a battery case containing a power generation element.
The exhaust valve corresponding to the element is provided, a wall surface is provided around the exhaust valve, a flat portion is provided on the upper surface of the wall, a rib is provided on an outer peripheral edge of the flat portion, and the inner wall surface of the rib contacts the flat portion. a lid in which a plurality of convex portions so as not to, the said protrusion
From the height of the projection with a through hole at the position corresponding to the exhaust valve
The end face of the thick absorbent paper abuts the rib on the outer edge of the middle lid
So that the upper lid is in contact with the
Adhering to the upper surface, and the end surface of the inner lid
Provided so as to abut, upper lid abuts with convex part provided in middle lid
A small sealed lead storage battery that is fixed . 2. A liquid absorbing paper is provided so as to penetrate the convex portion of the inner lid.
2. The small sealed lead-acid battery according to claim 1, wherein the size of the through hole is the same as or slightly larger than the plane size of the projection, which can penetrate the projection.