JP7140952B2 - gas permeable structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gas permeable structure that is difficult to permeate moisture and has gas permeability.

In the gas permeable structure formed in the container body so as to allow the gas generated inside the closed container to be discharged to the outside, various gas permeable structures have been proposed which are difficult to permeate moisture and have gas permeability.

In Patent Document 1, a water vapor permeation preventing porous film that has air permeability and can prevent water vapor permeation, as used in the ventilation structure of a case that houses contents in a sealed structure, and this porous film is made of polyolefin resin. It is a film formed by melting and kneading a raw material composition mainly composed of inorganic powder and a plasticizer or a film obtained by removing the plasticizer, and the average pore diameter formed by removing the plasticizer is A structure having mainly two types of pores, that is, pores having a diameter of about 0.1 to 0.2 μm and pores having an average pore diameter of about 0.01 to 0.05 μm originally possessed by the inorganic powder itself, is obtained as a whole. , a hydrophilic porous membrane with a pore structure having an average pore diameter of 0.05 to 0.2 μm, and a myriad of uniform, fine, and intricately intricate channels with innumerable communicating pores are formed throughout the membrane, oxygen In addition, the surface of the pores is hydrophilic, so when water vapor tries to pass through the membrane, the water vapor condenses in the pores and changes to water, which is a liquid, and the pores A membrane with a porous structure has been proposed to prevent the passage of

However, the porous membrane proposed in Patent Document 1 is a proposal of a gas permeable structure having selective permeability that allows gases such as oxygen to permeate but does not allow water vapor to permeate. It is necessary to use a membrane.

In addition, in Patent Document 2, a permeable resin film is formed on one side of a perforated film in which fine holes are provided, and an impermeable film with cuts is formed on the other side to increase pressure from the inside. The gas permeable structure is a plastic film that is used as a sealing lid for a container, etc. Proposed.

However, in the plastic film that becomes gas permeable (gas permeable) by pressurization proposed in Patent Document 2, the micropores through which gas permeates are covered with a permeable resin film and an impermeable film with cuts. is required, and a cut must be made for each microhole.

In addition, in Patent Document 3, as a gas permeable member that blocks moisture such as water vapor and facilitates discharge of gas generated inside the sealed container to the outside of the sealed container, a through hole in the sealed container body (container body) This through hole is set to a size that blocks moisture such as water vapor so that a gas selection action utilizing the difference in gas permeability is expressed, making it difficult for moisture to permeate and gas The inventors of the present application have proposed a permeable gas permeable structure.

The gas permeable structure proposed in Patent Document 3 uses through holes with a hole diameter set to a size that blocks moisture such as water vapor so that a gas selective action utilizing the difference in gas permeability is exhibited. There is a need.

JP 2012-30184 A JP-A-11-301748 JP 2016-103631 A

The present invention does not use a porous membrane with hydrophilic inner and outer surfaces as in Patent Document 1, or uses a permeable resin membrane and a notched impermeable film as in Patent Document 2. To provide a gas-permeable structure which does not need to be set to a pore size large enough to block moisture such as water vapor as described in Document 3, and has gas permeability by making it difficult for moisture to permeate with a simple structure. do.

A gas permeable structure according to claim 1 of the present invention is a gas permeable structure formed in a base material of a container body so as to discharge gas generated inside a closed container to the outside, wherein the base material has is formed with a large number of holes communicating with the inner and outer surfaces in the direction in which gas is discharged. The core element is partially in contact with the inner surface of each hole, and the core element is bent by the gas pressure inside the closed container to separate from the inner surface of the hole, and each of the many holes communicates with the gas. In the gas permeable structure serving as a permeation path, the core element is made of fluororesin or silicone rubber, and is arranged so as to be connected to adjacent ones of the plurality of holes at connecting portions. Gas permeable structure.

The gas-permeable structure of the present invention is a gas-permeable structure formed in the base material of the container body so as to discharge the gas generated inside the closed container to the outside, and the gas is discharged to the base material. A large number of holes communicating with the inner and outer surfaces in the direction are formed, and a solid core element is disposed in the large number of holes, and the core element is formed on the inner surface of each hole of the large number of holes. and the core element is bent by the gas pressure inside the sealed container, and separated from the inner surface of the hole, and each of the holes communicates with each other to form a gas permeation path. In the structure, the core element is made of fluororesin or silicone rubber, and is arranged in such a manner that it is connected to adjacent holes of the plurality of holes at connecting portions, so that the core element is attached to the inner and outer surfaces of the base material. By partially contacting the inner surface of the communicating holes, it is difficult for moisture to permeate, and gas permeability is provided. By doing so, a gas permeable structure can be obtained with a simple structure in which the gas is discharged to the outside.

1 is an enlarged partial cross-sectional view showing a gas permeable structure having a base material that is a constituent member of a container body in Embodiment 1 of the present invention. FIG. 1 is a partial cross-sectional view showing a gas permeation path in a gas permeation structure in Embodiment 1 of the present invention. FIG. 1 is a plan view showing a gas permeable structure having a base material that is a constituent member of a container body in Embodiment 1 of the present invention. FIG. 1 is a cross-sectional view showing a closed container in which a gas permeable structure is formed in Embodiment 1 of the present invention; FIG. FIG. 4 is a partial cross-sectional view showing gas permeation paths in a gas permeation structure in Embodiment 2 of the present invention. 6 is a partial cross-sectional view showing gas permeation action in the gas permeation path of FIG. 5; FIG. FIG. 10 is a cross-sectional view showing a state in which the base material of the gas permeable structure is not subjected to pressure inside the container body in Embodiment 3 of the present invention, and is an enlarged cross-sectional view with an additional note of the main part. FIG. 8 is a cross-sectional view showing a state in which the substrate shown in FIG. 7 is bent upward due to the pressure in the container body in Embodiment 3 of the present invention, and is an enlarged cross-sectional view with an additional note of the main part. FIG. 10 is a plan view showing a main part of a different embodiment of the gas permeable structure in Embodiment 4 of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 to 4 show a gas permeable structure having a base material that is a constituent member of the container body, and will be described below.

FIG. 4 exemplifies a sealed container for a sealed electrochemical device such as an electric double layer capacitor or a lithium battery as the closed container 9 in which gas is generated. A container body for sealing the closed container 9 comprises a lid body 5 having a gas discharge hole 5A and a box body 6 having an open end (upper end in FIG. 4). 5 is blocked. The base material 1 of the gas permeable structure is closely joined to the lid body 5 so that the gas discharge holes 5A of the lid body 5 are covered with the base material 1 of the gas permeable structure. 6 and base material 1 constitute a container body. An electrolyte 7 is accommodated in a space 6A inside the box 6. As shown in FIG. Electrode terminals 8 , 8 are formed on the lid 5 and electrically connected to the electrolyte 7 in the box 6 . Since the gas permeable structure is formed in the container body in this way, the gas generated inside the closed container 9 of the closed electrochemical device can be discharged to the outside through the gas discharge holes 5A.

Next, a gas permeable structure having a base material 1, which is a constituent member of the container body, will be described with reference to FIGS. 1 to 3. FIG.

1 to 3, the gas generated inside the sealed container 9 (the lower part in FIG. 1) flows through the base material 1 covering the gas discharge hole 5A in the direction of the arrow from the gas discharge hole 5A to the outside (in FIG. 1). A large number of holes 2 communicating with the outside are formed so as to discharge to the upper part), and a solid core element 3 is arranged in each hole 2 . The material of the base material 1 may be any material that does not have gas permeability, such as a metallic material or a non-metallic material, as long as it can form a large number of holes 2 communicating with the outside. Moreover, the material of the solid core element 3 may be any solid material such as a metallic material or a non-metallic material as long as the material is disposed in the hole 2 of the substrate 1 . In the core elements 3 arranged in the respective holes 2 , the core elements 3 arranged in the holes 2 adjacent in the direction in which the gas is discharged are connected by the connecting portions 31 . An opening 4A is formed so that gas is discharged from the gas permeation path 4 to the outside.

A solid core element 3 is disposed in each hole 2 with its outer periphery and the inner surface 2A of the hole 2 in non-covalent contact, but as shown in FIGS. A gas permeation path 4 is formed in which the gap changes so that the outer periphery of the core element 3 and the inner surface 2A of the hole 2 are separated from each other so that the discharged gas flows in the direction of the arrow and is discharged to the outside. In this gas permeation path 4, the distance from the contact state between the outer periphery of the core element 3 and the inner surface 2A of the hole 2 to the separation state is a minute gap, and the size of the gap is used as the gas permeation structure. It may be set according to the relationship between the size of the hole 2 and the core element 3 according to the application. In addition, since a large number of holes 2 communicating with the outside are formed in the base material 1 , the gap between the outer circumference of the core element 3 and the inner surface of the hole 2 is arranged differently for each hole 2. good too.

Regarding the method of providing the gas permeation paths 4 in the holes 2 of the base material 1 in FIGS. A configuration for arranging the core element 3 in the portion (hole 2) of this open-cell structure will be described. A cellular polymer such as polyurethane or polyolefin is used as a sponge material having an open-cell structure, and this sponge material is immersed in a silicone oil liquid, vulcanized, and filled with silicone. By removing the silicone filling on the surface, a gas permeable structure is obtained in which the core elements 3 made of silicone filling are arranged in the open-cell pores 2 of the substrate 1 . In this gas permeable structure, a core element 3 made of a silicone filling made mainly of silicone rubber is arranged in a hole 2 made of open cells of a substrate 1 so as to use a material with low adhesiveness. As a result, the outer circumference of the core element 3 and the inner surface of the hole 2 are easily separated from each other, and the gas permeation path 4 in which the distance between the outer circumference of the core element 3 and the inner surface of the hole 2 changes can be provided.

Thus, the gas permeable structure provided with the gas permeation path 4 shown in Embodiment 1 is formed in the container body having the gas discharge holes 5A so as to discharge the gas generated inside the sealed container 9 to the outside. A transmission structure comprising a substrate 1, a large number of holes 2 communicating with the inner and outer surfaces of the substrate 1, a solid core element 3 disposed in each hole 2, and the outer circumference of the core element 3 and the hole 2 Since the structure includes the gas permeation path 4 whose distance from the inner surface of the closed container 9 changes with the gas pressure generated inside the closed container 9, the gas permeation that makes it difficult for moisture to permeate with a simple structure and provides gas permeability A structure can be provided. Incidentally, the gas permeable structure has been described as having the base material 1 covering the gas discharge holes 5A of the lid 5, but the gas discharge holes 5A are the holes of the base material 1 of the gas permeable structure. 2, the cover 5 and the base material 1 of the gas permeable structure may be the same member.

(Embodiment 2)
FIGS. 5 and 6 show a gas permeable structure having a base material 1 which is a constituent member of the container body shown in Embodiment 1, in which a flexible core element 3 is arranged in a hole 2 of the base material 1. 1 shows a gas permeable structure.

In FIG. 5, a substrate 1 is formed with a large number of holes 2 communicating with the outside, as in the first embodiment, and a solid core element 3 is provided in each of the holes 2 . In each hole 2, a gas permeation path 4 having a minute gap is provided between the outer periphery of the core element 3 and the inner surface 2A of the hole 2. 5, it is brought into contact with the left and right sides of the inner surface of the hole, and can be brought into contact and separated by external pressure. Further, the material of the base material 1 may be any material such as a metallic material or a non-metallic material as in the first embodiment as long as it is a material capable of forming a large number of holes 2 communicating with the outside. A material having flexibility can be exemplified by fluorine resin and silicone rubber. In this way, the flexible core element 3 is arranged in each hole 2, and the core element 3 arranged in each of the holes 2 adjacent in the direction in which the gas is discharged is the same as in the first embodiment. They are connected at a connecting portion 31 . A material having flexibility is used as the material of the core element 3, and a material having flexibility is also used for the material of the base material 1 so that the hole 2 of the flexible base material 1 is flexible. A gas permeable structure in which a flexible core element 3 is arranged may be constructed. Further, if the material of the base material 1 and the material of the holes 2 are made of a material having a small adhesive effect, for example, a fluororesin material may be used.

In FIG. 6, the substrate 1 receives gas pressure in the direction of the arrow, that is, from the bottom surface to the top surface. 6, the right side of the inner surface of the hole) is separated to obtain a gas permeation path 4 in which the distance between the outer periphery of the core element 3 and the inner surface of the hole 2 changes, and the gas permeation path 4 makes it difficult for moisture to permeate. Gas flows through the gas permeation path 4 and is discharged to the outside. At this time, the thickness of the portion of the substrate 1 that receives the gas pressure becomes thinner and the holes 2 expand, and the amount of gas discharged increases. In this case, if the material of the substrate 1 is also made of a material having flexibility, the holes 2 are widened, and the gap is easily changed by the gas pressure, thereby improving the discharge of the gas.

As described above, the gas permeable structure provided with the gas permeation path 4 shown in Embodiment 2 uses the core element 3 having flexibility and is arranged in the hole 2 with the outer circumference of the solid core element 3 and the hole 2 . The gas permeation path 4 is configured such that the distance between the inner surface 2A and the inner surface 2A is changed by the gas pressure, and the gas permeation amount can be changed by making it difficult for water to permeate with a simple structure.

(Embodiment 3)
7 and 8 show the gas permeable structure formed in the container body such that the gas discharge hole 5A of the lid 5 of the container body illustrated in FIG. 1 indicates a gas permeable structure made of flexible material.

In FIG. 7, the hole 2 formed in the base material 1 of the gas permeable structure shows two holes 2 connected by a connecting part 31, but the base material 1 of the gas permeable structure is the same as that of the first embodiment. A large number of holes 2 communicating with the outside are formed. The substrate 1 is made of a flexible material such as fluororesin and silicone rubber, and has holes 2 communicating from the inner surface to the outer surface. The core elements 3 are inorganic spherical particles, and the particle size is such that each core element 3 does not come into contact with the inner surface of each hole 2 of the base material 1. Each hole 2 is filled with gas. A transmission path 4 is provided. The base material 1 of this gas permeable structure is made of a flexible material, but the base material 1 does not deform when no gas pressure is generated from the inside of the closed container (lower part in FIG. 8). Therefore, the holes 2 of the substrate 1 are not deformed.

In FIG. 8, when gas pressure is generated from the inside of the sealed container (lower part in FIG. 8) and the gas pressure is generated in the direction of the arrow on the base material 1, the base material 1 receiving this gas pressure is deformed and deformed. The hole 2 of 1 is also deformed, and the distance between the outer circumference of the core element 3 and the inner surface 2A of the hole 2 changes. At this time, the thickness of the portion of the substrate 1 that receives the gas pressure becomes thinner and the holes 2 expand, and the amount of gas discharged increases.

As described above, the gas permeable structure provided with the gas permeation path 4 shown in Embodiment 3 uses the flexible base material 1 and the outer periphery of the solid core element 3 and the inner surface 2A of the hole 2 are separated from each other. Since the gap is made to vary depending on the gas pressure, the gas permeation path 4 can be configured to change the flow of the gas according to the gas pressure, making it difficult for moisture to permeate through a simple structure, thereby providing gas permeability. Furthermore, the amount of gas permeation can be varied.

(Embodiment 4)
FIG. 9 shows a gas-permeable structure having a base material that serves as a constituent member of the container body that seals the closed container 9 illustrated in FIG. 1 shows a gas permeable structure.

In FIG. 9, the base material 1 is made of a non-woven fabric material in which fibers 20 are entangled so that the fibers communicate with the inner and outer surfaces, and the spaces between the fibers become a large number of holes 21 communicating with the outside. 3, and the material of the core element 3 is applied to each of the holes 21 so that the outer periphery of the core element 3 and the inner surface 21A of the hole 21 are distributed in contact with each other or separated from each other in each hole 21. a base material 1 made of a non-woven fabric material, holes 21 communicating with the inner and outer surfaces of the base material 1, core elements 3 disposed in the holes 21, and a space between the outer periphery of the core element 3 and the inner surface 21A of the hole 21. A gas-permeable structure having a gas-permeable path 4 that changes with the gas pressure generated inside the sealed container 9 is obtained. In this case, the material of the fiber 20 is not specified, such as metal fiber or polymer fiber, as long as it is a non-woven fabric material in which the fiber 20 is entangled so that the interfiber communicates with the inner and outer surfaces, but it can be made of a flexible material with little adhesion. Thus, for example, by using a fluororesin material for the fiber 20 and silicone rubber for the core element 3, the outer periphery of the core element 3 and the inner surface 21A of the hole 21 are separated from each other even if they are in contact with each other. Therefore, the gas permeation path 4 in which the outer periphery of the core element 3 and the inner surface 21A of the hole 21 can be brought into contact with each other can be obtained. Since the core element 3 is arranged in each of the holes 21 using the base material 1 made of the non-woven fabric entangled with the fibers 20 so as to communicate with the inner and outer surfaces, the pressure change to which the base material 1 receives is reduced. , the gap between the outer periphery of the core element 3 and the inner surface 21A of the hole 21 is changed by the gas pressure generated inside the closed container, and the simple structure makes it difficult for moisture to permeate, giving gas permeability, and increasing the amount of gas permeation. A gas permeable structure is obtained in which .

The gas permeable structure of the present invention can be used as a packing, a filter, or a safety valve.

1 base material 2, 21 hole 3 core element 4 gas permeation path

Claims (1)

A gas permeable structure formed on a base material of a container body so as to discharge gas generated inside a closed container to the outside, wherein the base material has a large number of gas permeable structures communicating with the inner and outer surfaces in the direction in which the gas is discharged. holes formed therein, a solid core element disposed in said plurality of holes, said core element partially contacting an inner surface of each hole of said plurality of holes; In the gas permeable structure, in which the core element is bent by the gas pressure inside the closed container to separate from the inner surface of the hole and communicate with each of the plurality of holes to form a gas permeation path, the core element comprises: A gas permeable structure, characterized in that it is made of a fluororesin or a silicone rubber, and is arranged so as to be connected to adjacent holes of the plurality of holes by connecting portions .

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