JP2002141041A - Sealing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing plate 1 that can prevent leakage of the liquid in the container to the outside at the reverse assembly of the container in the sealing plate 1 that closes the opening of the container and is fixed to the opening and comprises a sealing plate body 2 having a ventilating passage 5 communicating the outside and inside of the container and a functional membrane 7 provided in a state to block the ventilating passage. SOLUTION: A liquid leakage preventing mechanism 10 is provided inside the functional membrane 7 in the ventilating passage 5 for preventing the sealed liquid from flowing in the direction of the functional membrane 7 at the reverse assembly of the container. As a structure of the liquid leakage preventing mechanism 10, a combination of a sphere 12 that is provided inside the ventilating passage 5 capable of displacement and a sphere seating face 11b of a slope provided on the functional membrane 7 side of the sphere 12 is most appropriate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing plate, and more particularly to a sealing plate suitable for use as a sealing plate for an electric element in a battery, a fuel cell, a condenser or an electric double tank.

[0002]

2. Description of the Related Art In a battery, a fuel cell, a condenser or an electric double tank, etc., a sealing plate for closing an opening of a container is filled with a gas such as a gas generated inside the container during a process of charging and discharging the battery. A function is required that the liquid is discharged to the outside of the container and that the sealing liquid such as the electrolytic solution inside the container does not leak out to the outside of the container. As for the flow of gas, the atmosphere may be introduced into the container when the pressure inside the container decreases, and in this case, a bidirectional so-called breather function is required.

[0003] In order to satisfy such a function, the sealing plate is generally fixed to an opening of the container and provided with a ventilation channel communicating with the inside and outside of the container, and a sealing plate body for blocking the ventilation channel. And a functional film provided with a gas-permeable and liquid-impermeable material.

In such a sealing plate, the functional film is not usually immersed in the liquid because the container is not installed upside down. However, even if the container is installed upside down, the liquid is not This must not be leaked outside the container. As described above, functional membranes generally have liquid impermeability, so there is little concern about liquid leakage.However, depending on the specifications, liquid impermeability is incomplete or when the pressure inside the container becomes high. There is a possibility that the liquid may leak to the outside of the container at the time of reverse assembly with a functional film having such a specification.

[0005]

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a sealing plate capable of preventing liquid inside a container from leaking to the outside of the container during reverse assembly. .

[0006]

In order to achieve the above-mentioned object, a sealing plate according to claim 1 of the present invention is a sealing plate for closing an opening of a container, the sealing plate being fixed to the opening and containing the container. In a sealing plate having a sealing plate main body provided with a ventilation flow passage communicating between the inside and the outside, and a functional film provided so as to block the ventilation flow passage, the container is provided inside the functional film in the ventilation flow passage. And a liquid leakage preventing mechanism for preventing the sealing liquid from flowing in the direction of the functional film when reversely assembling is provided.

[0007] The sealing plate according to claim 2 of the present invention comprises:
The sealing plate according to claim 1, wherein the liquid leakage prevention mechanism includes a sphere displaceably provided in the ventilation flow path, and an inclined sphere seating surface provided on the functional film side of the sphere. It is characterized by having.

[0008] In the sealing plate according to the first aspect of the present invention having the above-described structure, the inside of the functional membrane in the ventilation flow path is provided.
Since the liquid leakage prevention mechanism is provided to prevent the sealing liquid from flowing in the direction of the functional film when the container is reversely assembled, the sealing liquid is blocked by the liquid leakage preventing mechanism and reaches the functional film. Therefore, it is possible to prevent the sealing liquid from passing through the functional film and leaking to the outside.

The structure of the liquid leakage preventing mechanism having such an effect is, as described in claim 2, a sphere provided displaceably in the ventilation flow path and a sphere provided on the functional film side of the sphere. It is preferable to use a combination with an inclined spherical sphere seating surface.

The proposal includes the following technical items.

In a sealing plate having a breather function, liquid is not immersed in the functional film because it is not normally installed upside down. And there is a request. Depending on the performance of the functional membrane, there is a specification in which gas permeability is prioritized, and there is a specification in which liquid permeates at high pressure. On the other hand, one sealing plate proposed by the present application mounts a rubber bush and spherical parts to prevent liquid leakage. Stop leak. Also, in normal times, the internal pressure is applied to the inside of the container, so that the structure is not completely sealed between the bush and the sphere, so that gas permeates.

For a sealing plate for a primary battery, a secondary battery, a capacitor, or a fuel cell, a bush made of a rubber material and a spherical component are mounted inside a holding member of a breather portion. On the inner diameter side of the bush, a conical concave portion is provided in two directions, upper and lower.

A structure in which a liquid is not directly immersed in the functional film includes a rubber bush and a spherical component.

By making the bush made of rubber,
Because rubber material sticks to the outside when internal pressure is applied,
A sufficient sealing property with the holding member can be ensured.

[0015] By providing the rubber bush with a slip-off prevention, the rubber bush can be prevented from dropping.

As the shape of the rubber bush, a bead may be provided on the outer periphery to increase the surface pressure at the time of sealing.
In this case, it is acceptable even if there is no prevention of detachment.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a plan view of a sealing plate 1 according to an embodiment of the present invention. FIG. 2 shows a cross section taken along line AA of FIG. 2 and FIG. 3 shows an enlarged half section taken along line BB of FIG. Have been.

The sealing plate 1 according to this embodiment closes an opening of a pressure vessel (not shown) such as an aluminum electrolytic condenser or an electric double condenser, and is constructed as follows.

First, a sealing plate body 2 made of a resin material having a lid shape or a flat plate shape for closing the opening of the pressure vessel is provided, and the sealing plate body 2 is made of a predetermined material such as bakelite or PPS. It is molded as a disk-shaped molded product from a resin material made of a polymer material. The illustrated sealing plate body 2 is formed by stacking two resin disks.

When the plane of the sealing plate body 2 is regarded as a clock face, a pair of metal terminals 3 and 3 are provided at the three o'clock position and nine o'clock position, and the breather part 4 is provided at the twelve o'clock position. Is provided.

As shown in an enlarged scale in the sectional view of FIG. 3, the breather unit 4 is configured as follows.

That is, first, at a predetermined position (the above-mentioned 12 o'clock position) of the sealing plate body 2, a hole-shaped ventilation passage 5 penetrating in the thickness direction thereof is provided. A functional film mounting space 6 is provided, and a flat functional film 7 is inserted into the mounting space 6 together with an annular seal member 8 and held by an annular holding member 9.

The functional film 7 is made of PTFE (ethylene tetrafluoride resin).
Fatty) continuous porous membrane that has been treated for water repellency.
Gas permeability and liquid
It is impermeable. The functional film 7 has a pressure capacity
When the internal pressure of the vessel rises above atmospheric pressure,
Part is open and the pressure inside the pressure vessel is lower than the atmospheric pressure
When the pressure rises, the air is sucked in and the pressure vessel is kept at atmospheric pressure
Formed into a film or planar shape by a porous material.
PTFE material with excellent chemical resistance
Process to form a film-like porous body.
Water-repellent treatment by coating fluorine-based chemical on the porous body
It is molded by applying, not only its surface,
The inside of the porous body is also water-repellent with fluorine-based chemicals.
I have. The pore size of the porous body is 0.05 to 1 μm in actual size.
m. Thus satisfying these conditions
As a result, the differential pressure between the inside and outside of the pressure vessel becomes 0.01 kg / c.
m ²The breather function has been activated since about
Keeping the internal pressure constant, thus preventing the pressure vessel from exploding
Both have a breather to prevent leakage of the enclosed liquid such as electrolyte
It is configured.

The material of the functional film 7 is PTFE.
Besides, polyethylene, polypropylene, PVDF, cellulose acetate, polysulfone, polyacrylonitrile,
Polyamide or polyimide can be applied, and the production method is selected according to the material, and there are a stretching method, a track etching method, a melt phase separation method, a phase change method, a composite membrane method, and the like. I have.

The functional film 7 may be a continuous porous film formed by sintering and compressing a stainless steel metal fiber, the surface of which is subjected to a water-repellent treatment. Also in such cases, it has gas permeability and liquid impermeability as its characteristics. This functional film 7 also releases the pressure when the internal pressure of the pressure vessel becomes higher than the atmospheric pressure, and sucks the atmosphere when the internal pressure of the pressure vessel becomes lower than the atmospheric pressure. It is formed into a film or a plane by a porous body so as to maintain the inside at atmospheric pressure.

The seal member 8 is formed in a ring shape with a predetermined rubber-like elastic material such as silicon rubber, VMQ or EPDM, and is provided to prevent liquid from leaking along the outer periphery of the functional film 7. ing.

The holding member 9 is formed in a ring shape from a resin material or an aluminum material made of a predetermined polymer material such as PPS, and is press-fitted into the mounting space 6 from the inside thereof with a predetermined press-fit margin. Its function is to hold the seal member 8 and the functional film 7 in the mounting space 6 as described above, and to appropriately compress the seal member 8 to generate a predetermined seal surface pressure. The fixing method of the holding member 9 to the sealing plate main body 2 is not limited to the above-described press-fitting,
It may be welding or bonding.

Liquid leakage that prevents the enclosed liquid from flowing in the direction of the functional film 7 when the pressure vessel is mounted upside down on the inner peripheral side of the holding member 9 inside the functional film 7 in the ventilation flow path 5. A prevention mechanism 10 is provided, and is configured as follows.

First, a bush 11 made of a rubber-like elastic material is press-fitted on the inner peripheral side of the holding member 9, and a rigid spherical body (also referred to as a valve) is provided on the inner peripheral side of the bush 11. 12 is displaceably inserted.

An outer flange-shaped engaging portion 11a is provided at the upper end of the bush 11 to engage with a projecting engaging portion 9a provided on the inner peripheral surface of the holding member 9 to prevent the bush 11 from dropping. Is provided.

On the inner peripheral surface of the bush 11, a spherical body 12 can be seated, and an inclined spherical spherical seating surface (valve seat) that closes the inner periphery of the bush 11 and blocks the gas flow path 5 when seated. 11b, and an inward flange-shaped engaging portion 11c for engaging the sphere 12 to prevent the sphere 12 from dropping is provided inside the sphere seating surface 11b.

The breather unit 4 having the above-described structure has the function film 7 as a component thereof, which has gas permeability and liquid impermeability, and further has a filter function.
The reaction gas of the electrolytic solution generated in the pressure vessel, in particular, H ₂ gas, CO ₂ gas or the like can pass through the functional film 7. Therefore, it is possible to prevent the internal pressure of the pressure vessel from rising due to the generation of the reaction gas, to prevent the internal liquid from leaking, to prevent the intrusion of the external liquid, and to prevent foreign substances such as external dust from entering. You can do it.

According to the sealing plate 1 having the above structure, the following functions and effects can be obtained.

First, a liquid for preventing the sealing liquid from flowing in the direction of the functional film 7 when the container is mounted upside down, inside the functional film 7 in the ventilation flow path 5 and on the inner peripheral side of the holding member 9. Since the leak prevention mechanism 10 is provided, the sphere 12 is seated on the sphere seating surface 11b when the container is upside down, so that the sealing liquid is prevented from flowing from the seat to the functional film 7 side. It is possible. Therefore,
When the container is mounted upside down, it is possible to prevent the sealed liquid from reaching the functional film 7 and further permeating through the functional film 7 and leaking to the outside of the container.

Incidentally, at the time of normal operation other than the upside-down assembly, the pressure inside the container does not completely seal the bush 11 and the sphere 12, so that gas can pass through. Further, a groove, a notch (not shown), or the like may be provided at a contact portion of the bush 11 with the sphere 12 at this time, so that the groove or the like may function as a gas passage.

Since the bush 11 is formed of a rubber-like elastic material, the bush 11 is strongly pressed against the holding member 9 on the outer peripheral side when the internal pressure of the container is applied. Therefore, the sealing property between the bush 11 and the holding member 9 can be sufficiently ensured.

An outward flange-shaped engaging portion that engages with a protruding engaging portion 9a provided on the inner peripheral surface of the holding member 9 at the upper end of the bush 11 to prevent the bush 11 from dropping. 11
a is provided, the bush 11 is
Never fall off.

As the shape of the bush 11, a required number of annular sealing beads (not shown) may be provided on the outer peripheral surface of the bush 11 to increase the surface pressure at the time of sealing. In this case, since the bush 11 is firmly fitted to the inner periphery of the holding member 9 by the bead and is prevented from coming off, it is not sufficient to provide the engaging portion 11a.

[0040]

The present invention has the following effects.

That is, in the sealing plate according to the first aspect of the present invention having the above-described structure, the inner sealing liquid flows in the direction of the functional film when the container is reversely assembled inside the functional film in the ventilation channel. Since the liquid leakage prevention mechanism for preventing the leakage is provided, it is possible to suppress the flow of the sealing liquid toward the functional film when the container is reversely assembled. Therefore, it is possible to prevent the sealed liquid from reaching the functional film when the container is reversely assembled and further leaking to the outside of the container through the functional film.

Also, the present invention having the above-mentioned structure is provided in claim 2 of the present invention.
In the sealing plate, a liquid leakage prevention mechanism is provided inside the functional film in the ventilation channel to prevent the sealing liquid from flowing in the direction of the functional film when the container is reversely assembled. Since the sphere is provided so as to be displaceable in the ventilation flow path and the sphere-shaped sphere seating surface provided on the functional film side of the sphere, the sphere is seated when the container is reversely assembled. By sitting on the surface, it is possible to suppress the flow of the sealing liquid from the seating portion to the functional film side. Therefore, it is possible to prevent the sealed liquid from reaching the functional film when the container is reversely assembled, and further leaking out of the container through the functional film.

[Brief description of the drawings]

FIG. 1 is a plan view of a sealing plate according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is an enlarged half sectional view taken along line BB in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealing plate 2 Sealing plate main body 3 Metal terminal 4 Breather part 5 Air flow path 6 Mounting space 7 Functional film 8 Sealing member 9 Holding member 9a, 11a, 11c Engaging part 10 Liquid leak prevention mechanism 11 Bush 11b Spherical seating surface 12 Sphere

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 14, 2002 (2002.2.1
4)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01M 2/04 H01G 9/00 301Z

Claims (2)

[Claims] 1. A sealing plate body (2) for closing an opening of a container, the sealing plate body (2) being fixed to the opening and having a ventilation flow path (5) communicating inside and outside of the container. )
And a sealing film (1) having a functional film (7) provided so as to block the ventilation flow path (5), wherein the inside of the functional film (7) in the ventilation flow path (5) is When the container is reversely assembled, the sealing liquid is filled with the functional film (7)
A sealing plate provided with a liquid leakage prevention mechanism (10) for preventing flow in a direction. 2. The sealing plate according to claim 1, wherein the liquid leakage prevention mechanism (10) is displaceably provided in the ventilation flow path (5), and a functional film of the sphere (12). (7) The inclined spherical surface seating surface (11) provided on the side
b) a sealing plate comprising: