Valve structure and package with the same

Abstract

To provide a valve structure and a package with the same capable of preventing moisture from mixing into a packaging container while gas vent can be performed when inner pressure of the packaging container increases.SOLUTION: A valve structure attached to a packaging container is provided. The valve structure includes: an outer valve body with a passage formed inside which communicates the inside with the outside of the packaging container; a nonreturn valve disposed inside the passage; and a moisture barrier mechanism disposed at a secondary side which is a side toward the outside of the nonreturn valve so as to block the passage.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a valve structure and a packaging body including the same. [Background technology]

[0002] JP 2016-31934 A (Patent Document 1) discloses a battery in which a battery element is housed in a pouch. A valve structure having a check valve is attached to the heat-sealed part formed along the periphery of the pouch. This check valve is configured to operate and release gas when the internal pressure of the pouch rises above a certain level.

[0003] Also, JP 2010-153841 A (Patent Document 2) discloses a battery in which a battery element is housed in a box-shaped laminated container. This laminated container has a flange-shaped heat-sealed portion formed along its periphery, which is formed with a portion that is easier to peel off than other portions (hereinafter referred to as an easy-peel portion). The easy-peel portion peels off when the internal pressure of the laminated container rises above a certain level, and gas is released through a hole formed in the center of the easy-peel portion. Unlike a check valve as in Patent Document 1, the easy-peel portion is a break valve that does not return to its original state once peeled off. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-31934 A [Patent Document 2] JP 2010-153841 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, a check valve is generally a one-way valve and cannot usually completely prevent backflow. Therefore, it is practically difficult for a check valve that releases gas from inside a pouch such as that in Patent Document 1 to completely prevent air from entering the pouch. Therefore, in a battery such as that in Patent Document 1, moisture from the air gets into the pouch, causing deterioration of the battery.

[0006] On the other hand, in a battery such as that in Patent Document 2, once the rupture valve is ruptured, air enters the laminated container through the passage formed by the rupture. Therefore, even when a rupture valve is used as in Patent Document 2, moisture contained in the air enters the laminated container, causing deterioration of the battery.

[0007] The present invention aims to provide a valve structure and a package including the same that can release gas when the internal pressure of the package increases while preventing moisture from entering the package. Note that the present invention is not limited to the above-mentioned example of a battery, and can be applied to various packages or valve structures included therein in which moisture entry into the package can be a problem. [Means for solving the problem]

[0008] The valve structure according to a first aspect of the present invention is a valve structure to be attached to a packaging container, and comprises a valve outer body having a passage formed therein that connects the inside and outside of the packaging container, a check valve disposed in the passage, and a moisture barrier mechanism disposed on the secondary side, that is the side facing the outside of the check valve, so as to block the passage.

[0009] A valve structure according to a second aspect of the present invention is the valve structure according to the first aspect, wherein the moisture barrier mechanism includes a rupture valve that ruptures when pressure on the primary side, which is the side facing inward, increases.

[0010] A valve structure according to a third aspect of the present invention is the valve structure according to the first or second aspect, wherein the moisture barrier mechanism includes a waterproof liquid layer.

[0011] A valve structure according to a fourth aspect of the present invention is the valve structure according to any one of the first aspect to the third aspect, further comprising an accumulator arranged on the primary side of the moisture barrier mechanism.

[0012] A valve structure according to a fifth aspect of the present invention is the valve structure according to any one of the first to fourth aspects, wherein the valve outer body further includes a tubular portion disposed outside the packaging container, continuous with the mounting portion, and partially defining the passage. The check valve is disposed within the tubular portion.

[0013] A valve structure according to a sixth aspect of the present invention is the valve structure according to any one of the first to fifth aspects, wherein the packaging container is a laminated container, and the valve outer body includes an attachment portion that at least partially defines the passage and is fixed to the laminated container in a state where it is sandwiched between laminate films that constitute the laminated container.

[0014] A packaging body according to a seventh aspect of the present invention comprises the valve structure according to any one of the first to sixth aspects, and the packaging container to which the valve structure is attached.

[0015] A packaging body according to an eighth aspect of the present invention is a packaging body according to the seventh aspect, which is configured to release pressure when the internal pressure of the packaging container rises to a predetermined pressure that is less than 2 / 3 of the internal pressure resistance of the packaging container.

[0016] A packaging body according to a ninth aspect of the present invention is a packaging body according to the seventh or eighth aspect, which is configured to release pressure when the pressure difference between the internal pressure and the external pressure of the packaging container reaches a predetermined pressure of 0.05 to 0.75 MPa.

[0017] A package according to a tenth aspect of the present invention is the package according to any one of the seventh aspect to the ninth aspect, wherein the packaging container is a pouch.

[0018] A packaging body according to an eleventh aspect of the present invention is the packaging body according to any one of the seventh aspect to the tenth aspect, wherein the packaging container has an internal pressure resistance of 0.3 to 1 MPa.

[0019] A packaging body according to a twelfth aspect of the present invention is the packaging body according to any one of the seventh aspect to the eleventh aspect, wherein a substantial vacuum is formed within the packaging container before use begins.

[0020] A packaging body according to a thirteenth aspect of the present invention is the packaging body according to any one of the seventh aspect to the twelfth aspect, wherein the packaging container houses a battery element. Effect of the Invention

[0021] According to the present invention, a check valve is disposed in a passage that communicates between the inside and outside of a packaging container, and a moisture barrier mechanism is disposed on the secondary side of the check valve that faces the outside. Therefore, the check valve enables gas to be released when the internal pressure of the packaging container increases, while the moisture barrier mechanism prevents moisture from entering the packaging container. [Brief description of the drawings]

[0022] [Figure 1] 1 is a perspective view of a package including a valve structure and a packaging container according to an embodiment of the present invention; [Diagram 2] FIG. 4 is a side cross-sectional view showing the structure around the check valve and the breaker valve according to the embodiment. [Figure 3A] FIG. [Figure 3B] Cross-sectional view taken along line III-III in FIG. 3A. [Figure 4] 13 is a side cross-sectional view showing the structure around a check valve and a moisture barrier mechanism according to a modified example. FIG. [Diagram 5] FIG. 13 is a side cross-sectional view showing the structure around the check valve and the moisture barrier mechanism according to another modified example. [Figure 6A] FIG. 13 is a side cross-sectional view showing the structure around a check valve and a moisture barrier mechanism according to yet another modified example. [Figure 6B] FIG. 13 is a side cross-sectional view showing the structure around a check valve and a moisture barrier mechanism according to yet another modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A valve structure according to an embodiment of the present invention and a packaging body including the valve structure will be described below with reference to the drawings.

[0024] <1. Overall structure of the packaging> Fig. 1 shows a perspective view of a packaging body 101 according to this embodiment. As shown in the figure, the packaging body 101 includes a valve structure 100 according to this embodiment and a packaging container 200 to which the valve structure 100 is attached. In Fig. 1, a portion that is not normally visible from the outside is partially shown by dotted lines for reference. In the following, for convenience of explanation, the up-down direction in Fig. 1 will be referred to as "up-down" and the left-right direction will be referred to as "left-right", but the orientation and direction of the packaging body 101 when in use are not limited to these.

[0025] The contents of the packaging container 200 are not particularly limited, but the packaging body 101 is particularly suitable for containing contents that generate gas over time. The contents of the packaging container 200 can be, for example, coffee, fermented foods (such as miso paste), foods for long-term storage, etc., but the packaging body 101 of this embodiment is a battery, particularly a lithium ion secondary battery, and the packaging container 200 contains battery elements such as electrodes and an electrolyte as the contents.

[0026] The packaging container 200 is formed, for example, from a resin molded product or a film. The resin molded product referred to here can be manufactured by a method such as injection molding, compressed air molding, vacuum molding, or blow molding, and in-mold molding may be performed to impart design and functionality. The type of resin can be PP, PET, nylon, ABS, or the like. The film referred to here is, for example, a plastic film or a metal foil that can be manufactured by a method such as an inflation method or a T-die method. The film referred to here may or may not be stretched, and may be a single-layer film or a laminated film. The laminated film referred to here may be manufactured by a coating method, may be a film in which multiple films are bonded together with an adhesive, or may be manufactured by a multilayer extrusion method.

[0027] In this embodiment, the packaging container 200 is a laminated container. As the name suggests, a laminated container is made of a laminated film. The shape of the laminated container is not particularly limited, and it can be a bag-like container. In this embodiment, the laminated film is formed into a concave shape, and the laminated film is heat-sealed at an appropriate portion (periphery) with the laminated film superimposed thereon, thereby forming a heat-sealed portion 201. The heat-sealed portion 201 forms an internal space of the packaging container 200 that is isolated from the external space. In this specification, the heat-sealing mode may be heat welding from a heat source, ultrasonic welding, or the like. The laminated film may be a laminated body in which a base layer, a barrier layer, and a heat-sealable resin layer are laminated in this order.

[0028] The valve structure 100 is configured to release gas generated inside the packaging container 200 to the outside as necessary, and to prevent the packaging container 200 from bursting due to internal pressure. In the following, with the valve structure 100 as a reference, the side facing the inside of the packaging container 200 is called the primary side, and the opposite side of the primary side (the side facing the outside of the packaging container 200) is called the secondary side.

[0029] <2. Valve structure configuration> As shown in Fig. 1, the valve structure 100 includes a valve outer body 2 in which a passage L is formed. The valve outer body 2 has a cylindrical portion 20 and an attachment portion 22. The attachment portion 22 is a portion for attaching the valve structure 100 to a packaging container 200. In this embodiment, the attachment portion 22 is fixed to the packaging container 200 by being heat-sealed while being sandwiched between laminate films that form a heat-sealed portion 201 when the packaging container 200 is made into a bag. In Fig. 1, the positions where the packaging container 200 is heat-sealed are indicated by oblique hatching.

[0030] The mounting portion 22 includes an annular portion 23 whose central axis is approximately aligned with that of the cylindrical portion 20, and wing-like extension ends 24 and 24 extending leftward and rightward from the left and right ends of the annular portion 23, respectively, and has a teardrop shape in a plan view. The cylindrical portion 20 is a substantially cylindrical portion extending upward from the upper end of the mounting portion 22. Although not limited thereto, in this embodiment, the cylindrical portion 20 and the mounting portion 22 are made of metal such as stainless steel, and are welded to each other after being molded as separate parts. However, the cylindrical portion 20 and the mounting portion 22 can also be integrally configured. In addition, when the mounting portion 22 and the cylindrical portion 20 are separate parts, the two can be made of different materials, for example, the cylindrical portion 20 can be made of stainless steel, and the mounting portion 22 can be made of hard resin. The passage L is a passage with a substantially circular cross section that extends vertically through the inside of the mounting portion 22 and the cylindrical portion 20, and communicates the inside and outside of the packaging container 200.

[0031] A check valve 3 is disposed in the passage L. FIG. 2 is a side cross-sectional view showing a structure around the check valve 3. The check valve 3 is configured to open when the pressure on its primary side rises, and release gas from the primary space to the secondary space. In the passage L, a space R1 on the primary side of the check valve 3 communicates with the inside of the packaging container 200, and the internal pressure of the space R1 is equal to the internal pressure of the packaging container 200. The space R1, together with the inside of the packaging container 200, forms a closed space in which gas generated inside the packaging container 200 is first sealed. In other words, the check valve 3 is configured to open when the internal pressure of the packaging container 200 rises due to gas generated inside the packaging container 200. The check valve 3 is a one-way valve that releases gas from the inside to the outside of the packaging container 200 in accordance with the internal pressure of the packaging container 200. The check valve 3 is a return valve that allows repeated gas release.

[0032] 2, the passage L guides gas generated in the packaging container 200 to the check valve 3. The configuration of the check valve 3 is not particularly limited, and in this embodiment, it is a ball-spring type as shown in FIG. 2, but it can also be, for example, a duckbill type, an umbrella type, or the like. The check valve 3 of this embodiment includes a valve seat 210, an O-ring 212, a ball 214, and a spring 216.

[0033] The valve seat 210 is disposed so as to protrude from the inner circumferential surface of the cylindrical portion 20 toward the inside of the passage L. The valve seat 210 defines an inverted cone-shaped space in the passage L, the diameter of which increases toward the top, and the space communicates with the space R1 on the primary side of the check valve 3. The valve seat 210 receives a ball 214 as a valve body biased from above by a spring 216, and at this time, the check valve 3 is closed. The ball 214 contacts the lower end of the spring 216, and the upper end of the spring 216 is fixed to the inner circumferential surface of the cylindrical portion 20. In the example of FIG. 2, the spring 216 is a leaf spring, but may be a coil spring. The valve seat 210 may be made of a metal such as stainless steel, and may be integral with the cylindrical portion 20 and the mounting portion 22. When the ball 214 is seated on the valve seat 210, the O-ring 212 eliminates a gap between the ball 214 and the valve seat 210, and helps to improve the sealing performance in the closed state. The O-ring 212 is a hollow circular ring, and is made of, for example, fluororubber. The materials of the ball 214 and the spring 216 are not particularly limited, and for example, both can be made of a metal such as stainless steel. The ball 214 may be made of resin. Alternatively, one of the ball 214 and the valve seat 210 can be made of rubber, and the other can be made of a metal such as Teflon (registered trademark) or Teflon-coated stainless steel.

[0034] In addition, a space R2 is formed in the passage L on the secondary side of the check valve 3 (the side toward the outside of the packaging container 200 from the position where the valve seat 210 and the ball 214 contact each other). When the internal pressure of the packaging container 200, i.e., the internal pressure of the space R1 on the primary side of the check valve 3, reaches a predetermined pressure, gas induced from inside the packaging container 200 presses the ball 214 upward. When the ball 214 is pressed and moves away from the valve seat 210, the spring 216 deforms, and the contact part between the spring 216 and the ball 214 moves upward, and the check valve 3 is opened. In this open state, gas generated inside the packaging container 200 flows out into the space R2 through a gap formed between the ball 214 and the O-ring 212. As a result, the gas in the space R1 is discharged, and the force pressing the ball 214 upward weakens, and the force with which the spring 216 urges the ball 214 downward becomes greater, and the shape of the spring 216 is restored. As a result, the check valve 3 is again in the closed state.

[0035] Break valve 1 is disposed on the secondary side of check valve 3. More specifically, flange portion 21 is formed on the inner peripheral surface of the upper end portion of cylindrical portion 20, and the upper surface of flange portion 21 is welded to the outer peripheral edge of break valve 1. Break valve 1 is made of a metal such as aluminum, and has a substantially circular disk shape. Break valve 1 is disposed so as to close passage L and seal space R2 from the external space. Flange portion 21 is an inner flange, and the outer diameter of break valve 1 is larger than the inner diameter of flange portion 21, and in this embodiment, is approximately the same size as the outer diameter of flange portion 21. Note that break valve 1 may be fixed to the lower surface of flange portion 21.

[0036] The break valve 1 is configured to burst open when the pressure on its primary side increases to release gas from the primary space to the secondary space. In other words, the break valve 1 is configured to burst open and release gas to the external space when gas generated inside the packaging container 200 passes through the check valve 3 and accumulates in the secondary space R2, causing the internal pressure of the space R2 to rise.

[0037] The rupture valve 1 prevents communication of gas and liquid before rupture. That is, the rupture valve 1 functions as a moisture barrier mechanism that prevents air and moisture contained therein from entering the inside of the packaging container 200 from the outside.

[0038] FIG. 3A is a top view of the breaker valve 1. The upper surface of the breaker valve 1 is formed with a notch 10 cut into a substantially Y-shape. FIG. 3B is a cross-sectional view taken along line III-III in FIG. 3A. As shown in FIG. 3B, the notch 10 is formed symmetrically on the upper and lower surfaces of the breaker valve 1, and the thickness W1 of the notch 10 is thinner than the thickness W2 of the other parts of the breaker valve 1. In other words, the notch 10 has a relatively lower strength than the other parts of the breaker valve 1, and is a portion where stress is concentrated when the pressure on the primary side of the breaker valve 1 increases. As a result, when a certain level of pressure or more is applied to the breaker valve 1 as the internal pressure of the space R2 increases, rupture occurs at the notch 10, and the breaker valve 1 is ruptured. The opening pressure of the breaker valve 1 is the pressure at which the breaker valve 1 ruptures (the pressure difference between the primary side and the secondary side), and can be appropriately realized by parameters such as the shape, thickness W1, and material of the notch 10. It should be noted that "crack" here refers to the material constituting the rupture valve 1 being severed, resulting in gas and liquid communication between the primary and secondary sides of the rupture valve 1.

[0039] As described above, in this embodiment, the break valve 1 is disposed on the secondary side of the check valve 3. Although the check valve 3 can be said to be a one-way valve, it cannot completely prevent backflow by itself. Therefore, it is difficult to completely prevent the entrance of air into the packaging container 200 by the check valve 3 alone, and deterioration of the battery may occur. In this regard, in this embodiment, before the break valve 1 ruptures, the presence of the break valve 1 sufficiently prevents the entrance of air into the packaging container 200, and deterioration of the battery due to moisture contained therein can be effectively prevented.

[0040] Moreover, the break valve 1 ruptures after the check valve 3 has been actuated at least once. Therefore, after the break valve 1 ruptures, the internal pressure in the space R1 on the primary side of the check valve 3 is maintained at a relatively high state, creating a state in which even a slight backflow through the check valve 3 is unlikely to occur. Therefore, even after the break valve 1 ruptures, the action of the check valve 3 prevents the air from entering the packaging container 200, and it is possible to effectively prevent deterioration of the battery due to moisture contained therein. Therefore, even after the break valve 1 ruptures, the packaging body 101, which is a battery, can be used continuously.

[0041] Furthermore, the packaging body 101 of this embodiment is a battery, and immediately after manufacture and before use, a vacuum is substantially formed inside the packaging container 200. Here, due to the problem of air backflow described above, if the break valve 1 were not present and only the check valve 3 was used, it would be difficult to draw a vacuum inside the packaging container 200. In this regard, in this embodiment, due to the presence of the break valve 1, such a vacuum can be easily drawn.

[0042] Furthermore, in this embodiment, check valve 3 and break valve 1 are disposed inside cylindrical portion 20, not in mounting portion 22. As a result, the risk of the various parts constituting check valve 3 and break valve 1 being deformed by heat when mounting portion 22 is attached to packaging container 200 by heat sealing is reduced.

[0043] The opening pressure of the check valve 3 is preferably higher than the opening pressure of the breaker valve 1. In the opposite case, the breaker valve 1 does not easily break open, so the internal pressure of the secondary space R2 rises, and at this time, there is a possibility that the check valve 3, which operates due to the differential pressure between the primary side and the secondary side, will not be able to operate until the internal pressure of the packaging container 200 increases further. Note that, like the breaker valve 1, the opening pressure of the check valve 3 is the pressure at which the check valve 3 opens (the pressure difference between the primary side and the secondary side).

[0044] The internal pressure resistance of the packaging container 200 is preferably 0.3 MPa or more. In this case, the packaging container 200 is prevented from bursting due to unexpected causes such as vibration. The internal pressure resistance of the packaging container 200 can be 1 MPa or less. In this case, the occurrence of defects in the internal components of the battery due to a large amount of gas generated in the packaging container 200 can be suppressed. The internal pressure resistance of the packaging container 200 means the maximum internal pressure of the packaging container 200 that can maintain the packaging container 200 in an airtight sealed state when the valve structure 100 is omitted and the mounting position of the valve structure 100 is heat-sealed in the same manner as its surroundings. Here, the internal pressure of the packaging container 200 is expressed as a difference from the atmospheric pressure. In addition, when pressures are expressed as numerical values, they are measured in a 25°C environment unless otherwise specified.

[0045] Moreover, the packaging body 101 is preferably configured so that the rupture valve 1 bursts open to release the pressure to the outside space when the internal pressure of the packaging container 200 rises to a predetermined pressure that is equal to or less than ⅔ of the internal pressure resistance of the packaging container 200. In this case, gas can be released by the valve structure 100 more reliably before the packaging container 200 bursts.

[0046] Furthermore, packaging body 101 is preferably configured such that break valve 1 ruptures to release pressure to the external space when the pressure difference between the internal pressure and the external pressure (pressure in the external space) of packaging container 200 reaches a predetermined pressure of 0.05 MPa or more and 0.75 MPa or less. If break valve 1 ruptures when the pressure difference between the internal pressure and the external pressure of packaging container 200 is 0.05 MPa or less, the valve may open with slight vibration, whereas if break valve 1 ruptures when the pressure difference is 0.75 MPa or more, deformation around valve structure 100 becomes so large that there is a possibility of short-circuiting between the electrodes.

[0047] The opening pressure of the break valve 1 is preferably 0.05 to 0.75 MPa. The opening pressure of the check valve 3 is preferably 0.05 to 0.75 MPa. The opening pressure of the break valve 1 is preferably the same as or lower than the opening pressure of the check valve 3. When the internal pressure resistance of the laminated container 200 exceeds 1 MPa in a high temperature environment of 100°C, the opening pressure of the break valve 1 is preferably ⅔ of 1 MPa or lower. This is because if the opening pressure of the break valve 1 exceeds ⅔ of 1 MPa, even if the laminated container 200 does not break, the electrodes may deform due to deformation, causing problems such as a short circuit.

[0048] <3. Operation of the valve structure> The following describes the use of the valve structure 100. The valve structure 100 is used in a state where it is airtightly attached to a packaging container 200.

[0049] As already described, the package 101 is a battery, and the packaging container 200 contains an electrolyte. The electrolyte may evaporate or decompose for some reason. When gas is generated inside the packaging container 200 due to the evaporation or decomposition of the electrolyte, the internal pressure of the space R1 increases. When the internal pressure of the space R1 (the pressure difference with the space R2) increases and reaches the opening pressure of the check valve 3, the check valve 3 opens. When the check valve 3 opens, the space R1 and the space R2 communicate with each other, and the gas can escape into the space R2, which was originally a closed space. As a result, the internal pressure applied to the packaging container 200 drops, and the check valve 3 returns to the closed state.

[0050] When the check valve 3 opens once or repeatedly, and the internal pressure of the space R2 rises and reaches the opening pressure of the break valve 1, the break valve 1 ruptures. This allows the space R2 to communicate with the external space, and the gas in the space R2 is released to the external space.

[0051] Once rupture valve 1 is ruptured, it no longer functions. However, since check valve 3 is present on the secondary side of rupture valve 1, the inside and outside of packaging container 200 do not communicate with each other, and a state in which air and the moisture contained therein are unlikely to enter packaging container 200 continues. Therefore, even after rupture valve 1 is ruptured, it is possible to continue using packaging body 101, which is a battery.

[0052] <4. Modifications> Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, the following modifications are possible. In addition, the gist of the following modifications can be combined as appropriate.

[0053] <4-1> In the above embodiment, the rupture valve 1 is a metal plate-like member in which the notch 10 is formed, but the configuration of the rupture valve 1 is not limited to this aspect. For example, the rupture valve 1 can also be formed of a laminate film whose outer periphery is heat-sealed to the upper end of the valve outer body 2. In this example, as in the above embodiment, when the pressure on the primary side of the laminate film, which is the rupture valve 1, increases due to gas generated inside the packaging container 200, the laminate film is peeled off (the valve opens). Also, as shown in FIG. 4, a pouch 1a may be attached to the cylindrical portion 20 of the valve outer body 2 so as to seal the internal space from the external space. In this example, too, the pouch 1a is peeled off (the valve opens) when the pressure inside the pouch 1a increases due to gas generated inside the packaging container 200. As described above, the rupture valve can be preferably formed by easy peeling.

[0054] <4-2> In the above embodiment, instead of the break valve 1, a waterproof liquid layer 1b can be arranged on the secondary side of the check valve 3 as shown in FIG. 5. In this case, for example, oil that allows gas to pass but does not allow liquid to pass can be used as the waterproof liquid. The waterproof liquid layer 1b can be formed, for example, as shown in FIG. 5, by arranging a membrane 1c that allows gas to pass but does not allow liquid to pass in two places in the passage L along the direction in which the passage L extends, and storing the waterproof liquid between these membranes 1c. For example, a nonwoven fabric made of fluorine or coated with fluorine, or a Gore-Tex (registered trademark) fabric can be used as such membrane 1c. In this modified example, the waterproof liquid layer 1b is excellent in that it allows gas to pass through, and is therefore difficult to be broken by an increase in the internal pressure of the space R2. Also, unlike a break valve, there is no need to set the pressure, so gas can be released to the outside by pressure control only of the check valve. On the other hand, waterproof liquid layer 1b is impermeable to liquid and can therefore function as a moisture barrier mechanism that prevents air and the moisture contained therein from mixing from the outside to the inside of packaging container 200. Note that waterproof liquid layer 1b can also be disposed together with rupture valve 1. In this case, it is preferable to dispose waterproof liquid layer 1b on the secondary side of rupture valve 1.

[0055] <4-3> In the above embodiment, both the breakage valve 1 and the check valve 3 are disposed within the cylindrical portion 20, but only the check valve 3, or both the breakage valve 1 and the check valve 3, may be disposed within the attachment portion 22. Also, the breakage valve 1 and the check valve 3 may be left disposed within the cylindrical portion 20, the teardrop-shaped attachment portion 22 may be omitted, and the packaging container 200 may be fixed to the outer circumferential surface of the cylindrical portion 20 by heat sealing.

[0056] <4-4> 6A, for example, a diaphragm-type accumulator 4 may be disposed in or in communication with the space R1 on the primary side of the check valve 3. In this case, the volume of the gas stored in the space R1 can be increased.

[0057] Alternatively or in addition to this, as shown in Fig. 6B, for example, a diaphragm-type accumulator 4 may be disposed on the primary side of the release valve 1 within space R2 on the secondary side of the check valve 3 or so as to communicate with this. In this case, it is possible to increase the volume for storing gas on the primary side of the release valve 1. On the other hand, when the release valve 1 operates and gas escapes to the external space, the gas stored in the accumulator 4 is also released to the external space.

[0058] Alternatively or in addition, as shown in Fig. 6B, for example, a diaphragm-type accumulator 4 may be disposed on the primary side of the waterproof liquid layer 1b in or in communication with the space R2 on the secondary side of the check valve 3. In this case, the volume for storing gas on the secondary side of the check valve 3 can be increased, so that it is possible to deal with a situation in which gas flows out from the check valve 3 into the space R2 all at once and the space R2 alone cannot keep up with the discharge of gas from the waterproof liquid layer 1b. The gas stored in the accumulator 4 is gradually released to the outside space. [Explanation of symbols]

[0059] 1. Break valve (moisture barrier mechanism) 1a Pouch (break valve, moisture barrier mechanism) 1b Waterproof liquid layer (moisture barrier mechanism) 2 Extravalvular body 3. Check valve 4 Accumulator 200 Packaging containers L aisle

Claims

1. A valve structure that is attached to a packaging container, The valve outer body has a passage formed inside that connects the inside and outside of the packaging container, a check valve disposed within the passage; A moisture barrier mechanism is positioned on the secondary side, which is the side facing outward from the check valve, so as to block the passage. Equipped with The aforementioned packaging container is a laminated container, The valve outer body is an attachment portion that at least partially defines the passage and is fixed to the laminated container by heat sealing while being sandwiched between laminated films that constitute the laminated container; It further includes a cylindrical portion that is located outside the packaging container, is continuous with the mounting portion, and partially defines the passage, The check valve is disposed within the cylindrical portion and includes a valve body and a spring disposed to be in contact with the valve body. The upper end of the spring is fixed to the inner circumferential surface of the cylindrical portion, forming a valve structure.

2. The valve body is spherical. The valve structure of claim 1 .

3. A valve structure according to claim 1 or 2, The packaging container to which the valve structure is attached A packaging body comprising:

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