JPH0765811A - Sealed storage battery - Google Patents

Abstract

PURPOSE:To apply lubricating liquid between a valve cylinder and a valve body in a way it is hardly lost, and provide a stable actuation pressure of a safety valve by composing the valve body to be hard to be attached to an upper surface of a bottom part of a recessed place. CONSTITUTION:A safety valve 1 is composed as follows. A recessed place 3 is provided in an upper surface of an upper plate 2 of a battery case to contain a group of electrode plates, and a ventilation hole 5 is provided at a bottom part 4 of the recessed place 3. A tapered recessed part 9a and a protruded part 9b are provided concenctrically at an upper surface of the bottom part 4 of the recessed place 3 about the center of the ventilation hole 5, and a plate of a valve body 7 having a tapered protruded part 10a and a recessed part 10b to be engaged with the recessed part 9a and the protruded part 9b respectively at a lower surface are combined and disposed to close the ventilation hole 5. Lubricating liquid is applied to a boundary surface where the upper surface of the bottom part 4 of the recessed place 3 and the valve body 7 engage each other, a valve cover 8 to prevent removal of the valve body 7 is supported at an entrance of the recessed place 3, and a spacer 11 having resiliency is disposed between the valve body 7 and a valve cover 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed storage battery,
Particularly, it relates to improvement of the safety valve portion.

[0002]

2. Description of the Related Art A safety valve 1 for a conventional sealed storage battery is shown in FIG.
As shown in FIG. 2, the upper plate 2 of the battery case is provided with a recess 3, the bottom 4 of the recess 3 is provided with a ventilation hole 5, and the ventilation hole 5 is surrounded to form a valve cylinder 6 on the bottom 4. A valve body 7 made of a rubber cap is integrally projectingly provided on an upper portion of the valve cylinder 6 so as to tighten the valve cylinder 6, and an oil is provided between the valve cylinder 6 and the valve body 7. The synovial fluid such as
The valve lid 8 for preventing the escape of the valve was supported.
In this case, the synovial fluid applied between the valve cylinder 6 and the valve body 7 is for preventing the valve body 7 from sticking to the valve cylinder 6 and for operating the valve body 7 for lubrication when gas is released. is there.

[0003]

However, in the safety valve 1 including the valve cylinder 6 and the cap-shaped valve body 7 as described above, the synovial fluid such as oil may cause the valve cylinder 6 and the valve body 7 to be used during long-term use. It may flow out and be lost during this period, and if this synovial fluid is lost, not only is it difficult for the valve body 7 to operate in a lubricated manner, but also because the valve body 7 is tightening the valve cylinder 6 at high temperatures. When used for a long period of time, the valve body 7 is fixed to the valve cylinder 6 and the safety valve 1
There is a problem that the operating pressure of the battery becomes high and the internal pressure of the battery container rises, so that the battery container is swollen and deformed.

An object of the present invention is to provide a sealed storage battery in which synovial fluid between the valve cylinder and the valve body is less likely to be lost and a stable working pressure of the safety valve can be obtained.

[0005]

The constitution of the present invention which achieves the above object will be described as follows.

According to a first aspect of the present invention, in the sealed storage battery in which a safety valve is provided on the upper plate of the battery case, and the gas inside the battery case is discharged to the outside from the safety valve by increasing the internal pressure of the battery, the safety valve is provided. Is provided with a recess in the upper surface of the upper plate of the battery case, a ventilation hole is provided in the bottom of the recess, and the concavities and convexes are concentrically formed on the bottom surface of the recess centering on the ventilation hole. Is provided, a plate-shaped valve element having a concave portion and a convex portion engaging with the convex portion and a concave portion on the lower surface on the upper surface of the bottom of the concave portion is arranged so as to close the vent hole, and the concave portion of the concave portion The interface between the upper surface of the bottom and the valve body is coated with synovial fluid, and a valve lid for preventing the valve body from coming out is supported at the entrance of the recess.

According to a second aspect of the present invention, in the first aspect, a spacer having elasticity is arranged between the valve body and the valve lid.

The invention described in claim 3 is the invention according to claim 1 or 2.
In the above, the synovial fluid is silicone oil.

[0009]

According to the present invention, a recess is provided in the upper surface of the upper plate of the battery case, a ventilation hole is provided in the bottom of the recess, and the ventilation hole is centered to form concentric circles on the top surface of the bottom of the recess. Providing concave and convex parts,
A plate-shaped valve body having a convex portion and a concave portion on the lower surface that mesh with the concave portion and the convex portion is arranged so as to overlap the vent hole on the upper surface of the bottom portion of the concave portion. If the synovial fluid is applied to the intermeshing interface of the, even if the synovial fluid flows, it collects in concentric recesses on the upper surface of the bottom of the recess, making it difficult for it to flow out, and holding it in the overlapping portion of the bottom of the recess and the valve body. Become so. For this reason, it becomes difficult for the valve element to stick to the upper surface of the bottom of the recess, and it is possible to prevent the operating pressure of the safety valve from increasing.

Further, when the bottom of the recess and the overlapping portion of the valve body have an uneven meshing structure, even if the battery is used upside down, the synovial fluid will be retained and retained in the recess of the valve body. .

When a spacer having elasticity is arranged between the valve body and the valve lid as in the second aspect, the plate-shaped valve body is evenly provided on the bottom surface of the recess through the spacer in the valve lid. Can be adhered to.

When silicone oil is used as the synovial fluid as in claim 3, it is possible to prevent sticking of the overlapping portion of the bottom of the recess and the valve body and to improve the airtightness.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIG. As shown in the figure, in the sealed storage battery of the present embodiment, the safety valve 1 is provided with a recess 3 on the upper surface of the upper plate 2 of the battery case that accommodates the electrode plate group, and the recess 4 is connected to the bottom 4 of the recess 3. Pores 5 are provided, and concentrically tapered recesses 9a and protrusions 9b are provided on the upper surface of the bottom portion 4 of the recess 3 with the vent hole 5 as the center. The plate-shaped valve bodies 7 having tapered convex portions 10a and concave portions 10b, which engage with the concave portions 9a and the convex portions 9b, are arranged so as to close the ventilation hole 5, and the upper surface of the bottom portion 4 of the concave portion 3 is formed. The synovial fluid is applied to the interlocking interface between the valve body 7 and the valve body 7, and the valve body 7 is provided at the entrance of the recess 3.
The valve lid 8 for preventing the escape of the valve is supported, and an elastic spacer 11 is arranged between the valve body 7 and the valve lid 8.

In this embodiment, the valve body 7 is made of chloroprene rubber and silicone oil is used as synovial fluid.
A sponge is used as the spacer 11.

In the present invention, the plate-shaped valve body 7 is made of chloroprene rubber, and the safety valve 1 conventionally made of the valve cap 7 made of a rubber cap is made of chloroprene rubber. The operating pressure of the safety valve 1 when left for 7 days was compared. The material of the battery case is the same for both.
It is a BS resin, and the silicone oil used is the same.

[0016]

[Table 1] As is clear from Table 1, the safety valve operating pressures of the present invention and the conventional product were almost the same in the initial stage, but in the test after being left unattended, the valve body 7 and the valve cylinder 6 made of the rubber cap in the conventional product were Adhesion occurred between them, and the safety valve operating pressure increased, whereas in the product of the present invention, almost no change was observed in the safety valve operating pressure.

[0017]

As described above, according to the sealed type storage battery of the present invention, the following excellent effects can be obtained.

In the invention according to claim 1, a recess is provided in the upper surface of the upper plate of the battery case, a ventilation hole is provided in the bottom of the recess, and a concentric circle is formed around the ventilation hole on the top surface of the bottom of the recess. A concave portion and a convex portion are provided on the bottom surface of the concave portion, and a plate-shaped valve body having a concave portion and a convex portion engaging with the convex portion and a concave portion on the lower surface is arranged so as to overlap the vent hole, Since the synovial fluid is applied to the interface between the upper surface of the bottom of the recess and the valve body, even if the synovial fluid flows, it collects in the concentric recesses on the upper surface of the bottom of the recess, making it difficult for it to flow out. It will be held in the overlapping part of the bottom of the place and the valve body. For this reason, the valve body is less likely to stick to the upper surface of the bottom of the recess, the safety valve operating pressure does not increase, and the stable operating pressure can be constantly released. Therefore, during long-term use, the safety valve operating pressure does not rise due to sticking between the valve body and the bottom surface of the recess, so there is no problem such as swelling of the battery case due to the rise in internal pressure, and the safety valve operating pressure is always stable. It is possible to provide a sealed storage battery having:

Further, when the bottom of the recess and the overlapping portion of the valve body have an uneven meshing structure, even if the battery is used upside down, the synovial fluid will be retained and retained in the recess of the valve body. There are advantages.

According to the second aspect of the present invention, since the spacer having elasticity is arranged between the valve body and the valve lid, the plate-like valve body is evenly arranged through the spacer in the valve lid. It can be brought into close contact with the upper surface of the bottom of the recess.

According to the third aspect of the invention, since silicone oil is used as the synovial fluid, it is possible to prevent clinging between the bottom of the recess and the overlapping portion of the valve body and to improve the airtightness therebetween. .

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a safety valve in a sealed storage battery according to the present invention.

FIG. 2 is a cross-sectional view of a safety valve in a conventional sealed storage battery.

[Explanation of symbols]

 1 Safety Valve 2 Upper Plate of Battery Case 3 Recess 4 Bottom 5 Vent 6 Valve Cylinder 7 Valve 8 Valve Lid 9a Recess 9b Convex 10a Convex 10b Recess 11 Spacer

Claims (3)

[Claims] 1. A sealed storage battery in which a safety valve is provided on an upper plate of a battery case, and gas inside the battery container is released to the outside from the safety valve when the internal pressure of the battery rises. A recess is provided on the upper surface of the upper plate, a ventilation hole is provided at the bottom of the recess, and a concave portion and a convex portion are concentrically provided on the bottom surface of the recess centering on the ventilation hole. A plate-like valve body having a convex portion and a concave portion on the lower surface that mesh with the concave portion and the convex portion is arranged so as to overlap the vent hole, and the bottom upper surface of the concave portion and the valve body are Synthetic fluid is applied to the intermeshing interface, and a valve lid that prevents the valve body from escaping is supported at the entrance of the recess. 2. The sealed storage battery according to claim 1, wherein a spacer having elasticity is arranged between the valve body and the valve lid. 3. The sealed storage battery according to claim 1, wherein the synovial fluid is silicone oil.