JP6579283B1 - Valve and package including the same - Google Patents

Abstract

The present invention provides a valve for a packaging container that can be used continuously even after the breaking valve is opened, and a package including the valve. A valve 100 that forms a passage L that communicates the inside and outside of a packaging container 200 formed of a resin molded product or a film. The valve is disposed so as to close the passage, and the break valve 1 is opened when the internal pressure of the packaging container rises due to the gas generated inside the packaging container. A check valve that is arranged on the secondary side, which is the side facing the outside of the destruction valve, and releases the gas from the inside of the packaging container to the outside in accordance with the internal pressure of the packaging container after the destruction valve is opened. 3 and an attachment portion 22 that at least partially defines the passage and is fixed to the packaging container in a state of being sandwiched between films constituting the packaging container. [Selection] Figure 1

Description

  The present invention relates to a valve for a packaging container and a package including the same.

  Japanese Patent Laying-Open No. 2004-006213 (Patent Document 1) discloses an invention relating to a battery pack of a prismatic battery. The battery pack includes a metal battery can in which the power generation element is sealed. Inside the battery can, gas may be generated due to vaporization or decomposition of the electrolytic solution. If the internal pressure of the battery can abnormally rises due to the generated gas, the battery can may be ruptured. In order to prevent such rupture, a safety valve is formed in the battery can disclosed in Patent Document 1. The safety valve is configured to break at an internal pressure lower than the internal pressure at which the battery can rupture and release the generated gas.

JP 2004006213 A

  The battery can of Patent Document 1 cannot be used continuously after the destruction valve has been split. Similar problems may occur not only in battery cans but also in packaging containers containing contents that generate gas.

  An object of the present invention is to provide a valve for a packaging container that can be continuously used even after the breaking valve is opened, and a package including the valve.

  The valve according to the first aspect of the present invention is a valve that forms a passage for communicating the inside and outside of a packaging container formed of a resin molded product or a film, and is disposed so as to close the passage, A breaking valve that is torn when the internal pressure of the packaging container is increased due to gas generated inside, and a secondary valve that is disposed on the secondary side that is the side facing the outside of the breaking valve in the passage; A check valve for releasing the gas from the inside of the packaging container to the outside in response to the internal pressure of the packaging container, and a film constituting the packaging container at least partially defining the passage And an attachment portion fixed to the packaging container.

  The valve which concerns on the 2nd viewpoint of this invention is a valve which concerns on a 1st viewpoint, Comprising: The valve opening pressure of the said destruction valve is 2/3 or less of the internal pressure resistance of the said packaging container.

  A valve according to a third aspect of the present invention is the valve according to the first aspect or the second aspect, and is a tube that is disposed outside the packaging container, is continuous with the attachment portion, and partially defines the passage. It further has a shaped part. The check valve is disposed in the cylindrical part.

  A package according to a fourth aspect of the present invention includes the valve according to any one of the first to third aspects and the packaging container.

  The packaging body which concerns on the 5th viewpoint of this invention is a packaging body which concerns on a 4th viewpoint, Comprising: The said packaging container is a pouch.

  The packaging body which concerns on the 6th viewpoint of this invention is a packaging body which concerns on a 4th viewpoint or a 5th viewpoint, Comprising: The internal pressure resistance of the said packaging container is 1 Mpa or less.

  A packaging body according to a seventh aspect of the present invention is the packaging body according to any one of the fourth to sixth aspects, wherein a vacuum is substantially applied in the packaging container before the break valve is opened. Is formed.

  The packaging body which concerns on the 8th viewpoint of this invention is a packaging body which concerns on either of the 4th viewpoint to the 7th viewpoint, Comprising: The said packaging container accommodates a battery element.

  A packaging body according to a ninth aspect of the present invention is the packaging body according to any of the fourth to eighth aspects, and the packaging container is a laminate container.

  According to the present invention, the check valve is arranged on the secondary side that is the side facing the outside of the destruction valve. Therefore, it can be continuously used even after the tear valve is opened.

The perspective view of the packaging body containing the valve (valve structure) which concerns on one Embodiment of this invention, and a packaging container. The top view of the destruction valve which concerns on the same embodiment. II-II sectional view taken on the line of FIG. Side sectional drawing which shows the structure of the periphery of the destruction valve and check valve which concerns on the same embodiment. Side sectional drawing which shows the structure of the periphery of the destruction valve and check valve which concerns on a modification. The sectional side view which shows the structure of the periphery of the destruction valve and check valve which concerns on another modification.

  Hereinafter, a valve according to an embodiment of the present invention and a package including the valve will be described with reference to the drawings.

<1. Overall structure of package>
FIG. 1 shows a perspective view of a package 101 according to this embodiment. As shown in the figure, the packaging body 101 includes a valve structure 100 that is a valve according to the present embodiment, and a packaging container 200 to which the valve structure 100 is attached. In FIG. 1, parts that are not originally visible from the outside are partially shown by dotted lines for reference. In the following, for convenience of explanation, the up and down direction in FIG. 1 is referred to as “up and down” and the left and right direction is referred to as “left and right”. However, the orientation and direction when the package 101 is used are not limited thereto.

  The contents of the package 101 are not particularly limited, but the package 101 is particularly excellent in accommodating contents that generate gas over time. The contents of the package 101 can be, for example, coffee, fermented food (miso etc.), food for long-term storage, etc., but the package 101 of this embodiment is a battery, particularly a lithium ion secondary battery. The battery element such as an electrode and an electrolytic solution is accommodated as the contents.

  The packaging container 200 is formed of a resin molded product or a film. The resin molded product here can be produced by a method such as injection molding, pressure molding, vacuum molding, blow molding or the like, and in-mold molding may be performed in order to impart designability and functionality. The type of resin can be PP, PET, nylon, ABS, or the like. Moreover, a film here is a plastic film and metal foil which can be manufactured by methods, such as an inflation method and a T-die method, for example. Moreover, the film here may or may not be stretched, and may be a single-layer film or a laminated film. Moreover, the laminated film here may be produced by a coating method, may be obtained by bonding a plurality of films with an adhesive or the like, or may be produced by a multilayer extrusion method.

  The packaging container 200 is a laminate container in this embodiment. As the name implies, the laminate container is composed of a laminate film. Further, the form of the laminate container is not particularly limited and can be formed into a bag shape. However, in this embodiment, the laminate film is formed into a concave shape, and a laminate film and an appropriate portion (peripheral part) overlapped on the laminate film are formed. In this way, the heat seal portion 201 is formed. The heat seal portion 201 forms an internal space of the packaging container 200 that is blocked from the external space. In addition, the aspects of heat sealing as used in the present specification are assumed to be aspects such as heat welding from a heat source and ultrasonic welding. The laminate film can be a laminate in which a base material layer, a barrier layer, and a heat-fusible resin layer are laminated in this order.

  The valve structure 100 is configured to release the gas generated inside the packaging container 200 to the outside as necessary, and to prevent the packaging container 200 from being ruptured by internal pressure. Hereinafter, with the valve structure 100 as a reference, a side toward the inside of the packaging container 200 is referred to as a primary side, and a side opposite to the primary side (a side toward the outside of the packaging container 200) is referred to as a secondary side.

<2. Configuration of valve structure>
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 part 22 is a part for attaching the valve structure 100 to the packaging container 200. In this embodiment, the attachment portion 22 is fixed to the packaging container 200 by being heat-sealed in a state of being sandwiched between laminate films constituting the heat seal portion 201 when the packaging container 200 is formed.

  The attachment portion 22 includes an annular portion 23 whose central axis substantially coincides with the cylindrical portion 20, and wing-like extended end portions 24 and 24 extending from the left and right ends of the annular portion 23 in the left direction and the right direction, respectively. It has a tear-drop shape when viewed. The cylindrical portion 20 is a substantially cylindrical portion that extends upward from the upper end of the mounting portion 22. Although not limited to this, in this embodiment, the cylindrical part 20 and the attaching part 22 are comprised with metals, such as stainless steel, and after being shape | molded as another parts, they are welded mutually. However, the cylindrical part 20 and the attaching part 22 can also be comprised integrally. In addition, when attaching part 22 and cylindrical part 20 are used as separate parts, both can be made of different materials. For example, cylindrical part 20 is made of stainless steel, and attaching part 22 is made of a hard resin. Can do. The passage L is a passage having a substantially circular cross section that extends vertically through the inside of the attachment portion 22 and the cylindrical portion 20, and communicates the inside and outside of the packaging container 200.

  In the passage L, a flange portion 21 is formed on the inner peripheral surface of the mounting portion 22, and the upper surface of the flange portion 21 is welded to the outer peripheral edge of the destruction valve 1. The release valve 1 is made of metal and has a substantially disk shape. The release valve 1 is disposed so as to close the passage L. The flange portion 21 is an inner flange, and the outer diameter of the release valve 1 is larger than the inner diameter of the flange portion 21 and slightly smaller than the inner diameter of the mounting portion 22 other than the flange portion 21. The destruction valve 1 may be fixed to the lower surface of the flange portion 21.

  When the pressure on its primary side rises, the breaker valve 1 is configured to cleave and release gas from the primary side space to the secondary side space. That is, the destruction valve 1 is configured to be cleaved when the internal pressure of the packaging container 200 increases due to the gas generated inside the packaging container 200. In addition, in the state shown in FIG. 1, the destruction valve 1 is a closed state which is not torn.

  The space R1 on the primary side of the destruction valve 1 in the passage L communicates with the inside of the packaging container 200, and the internal pressure of the packaging container 200 matches the internal pressure of the space R1. The space R1 on the primary side forms a closed space in which the gas generated inside the packaging container 200 is first sealed together with the inside of the packaging container 200.

  FIG. 2A is a top view of the destruction valve 1. On the upper surface of the breaker valve 1, a cutout portion 10 cut out in a substantially Y shape is formed. FIG. 2B is a cross-sectional view of the breaker valve 1 taken along the line II-II. As shown in FIG. 2B, the notch 10 is formed symmetrically between the upper surface and the lower surface of the breaker valve 1, and the thickness W1 of the notch 10 is thinner than the thickness W2 of the other part of the breaker valve 1. In other words, the notch 10 is a portion where the strength is relatively lower than other portions of the breaker valve 1 and stress is concentrated when the pressure on the primary side of the breaker valve 1 increases. As a result, when a certain pressure or more is applied to the breaker valve 1 as the internal pressure of the packaging container 200 increases, the notch 10 breaks and the breaker valve 1 is torn. The valve opening pressure of the release valve 1 is a pressure at which the release valve 1 is torn (pressure difference between the primary side and the secondary side), and is appropriately realized depending on parameters such as the shape, thickness W1, and material of the notch 10. be able to. The term “dehiscence” as used herein means that the primary side and the secondary side of the breaking valve 1 are in a gas and liquid communication state when the material constituting the breaking valve 1 is cut off. To do.

  The break valve 1 of this embodiment is made of aluminum, W1 is 10 to 20 [μm], and W2 is about 200 [μm]. Moreover, the valve opening pressure of the destruction valve 1 of this embodiment is 0.2 [MPa]. Here, the valve opening pressure is expressed as a value obtained by subtracting the pressure on the secondary side from the pressure on the primary side of the release valve 1, assuming that the pressure on the secondary side is atmospheric pressure (0.1 MPa). . Moreover, when a pressure is shown by a numerical value, unless otherwise specified, they shall be measured in a 25 degreeC environment. The valve opening pressure of the release valve 1 is preferably 2/3 or less of the internal pressure resistance of the packaging container 200. In this case, the destruction valve 1 can be opened more reliably before the packaging container 200 is ruptured. Note that the internal pressure resistance of the packaging container 200 means that the packaging container 200 is hermetically sealed when the valve structure 100 is omitted and the attachment position of the valve structure 100 is heat-sealed in the same manner as the surroundings. It means the maximum internal pressure of the packaging container 200 that can be produced. Here, the internal pressure of the packaging container 200 is represented by a difference from the atmospheric pressure. The internal pressure resistance of the packaging container 200 can be set to 1 [MPa] or less. In this case, it is possible to suppress the occurrence of problems in the internal parts of the battery due to the gas generated in large quantities in the packaging container 200. When the internal pressure resistance of the packaging container 200 exceeds 1 MPa in a high temperature environment of 100 ° C., the valve opening pressure of the breaker valve 1 is preferably 2/3 or less of 1 MPa. This is because if the valve opening pressure of the release valve 1 exceeds 2/3 of 1 MPa, even if the packaging container 200 does not break the bag, the electrode is deformed due to deformation and short-circuit occurs.

  A check valve 3 is arranged on the secondary side of the release valve 1 in the passage L. The check valve 3 is a one-way valve that discharges gas from the inside of the packaging container 200 to the outside in accordance with the internal pressure of the packaging container 200 after the destruction valve 1 is opened. The check valve 3 is a return valve that can be repeatedly vented.

  FIG. 3 is a side sectional view showing the structure around the breaker valve 1 and the check valve 3. As shown in FIG. 3, the passage L guides the gas generated in the packaging container 200 to the check valve 3 after the destruction valve 1 is torn. The configuration of the check valve 3 is not particularly limited. In this embodiment, as shown in FIG. 3, the check valve 3 is a ball spring type, but may be a duckbill type, an umbrella type, or the like. The check valve 3 according to this embodiment includes a valve seat 210, an O-ring 212, a ball 214, a spring 216, and a top surface portion 218.

  The valve seat 210 is disposed so as to protrude from the inner peripheral surface of the cylindrical portion 20 into the passage L. The valve seat 210 defines an inverted conical space whose diameter increases in the passage L in the passage L, and has a through hole O1 at the center for communicating the space with the space R2 on the secondary side of the destruction valve 1. The valve seat 210 receives a ball 214 as a valve body urged from above by a spring 216, and at this time, the check valve 3 is closed. The ball 214 is in contact with the lower end of the spring 216, and the upper end of the spring 216 is in contact with the top surface portion 218. The top surface portion 218 is a donut plate-shaped portion that is disposed at the upper end of the tubular portion 20 and has a through hole O2 in the center. The valve seat 210 and the top surface portion 218 can each be made of metal such as stainless steel, and can be configured integrally with the cylindrical portion 20. When the ball 214 is seated on the valve seat 210, the O-ring 212 eliminates the 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 material of the ball | bowl 214 and the spring 216 is not specifically limited, For example, both can be made from metals, such as stainless steel. Further, the ball 214 may be made of resin. Alternatively, one of the ball 214 and the valve seat 210 may be made of rubber, and the other may be made of metal such as Teflon (registered trademark) or stainless steel coated with Teflon (registered trademark).

  A space R2 on the secondary side of the release valve 1 in the passage L and on the primary side of the check valve 3 communicates with the space R1 on the primary side of the release valve 1 after the release of the release valve 1. At this time, the internal pressure of the space R2 matches the internal pressure of the packaging container 200 and the internal pressure of the space R1. The space R2 forms, together with the interior of the packaging container 200 and the space R1, a closed space that seals the gas generated inside the packaging container 200 after the destruction valve 1 is cleaved.

  In addition, a space R3 on the secondary side of the check valve 3 in the passage L (the side facing the outside of the packaging container 200 from the position where the valve seat 210 and the ball 214 are in contact) communicates with the external space. When the internal pressure of the packaging container 200, that is, the internal pressure of the space R2 on the primary side of the check valve 3 reaches a predetermined pressure after the breaking valve 1 is cleaved, the gas induced from the inside of the packaging container 200 causes the balls 214 to flow. Press upward. When the ball 214 is pressed and separated from the valve seat 210, the spring 216 contracts, and the check valve 3 is opened. In this open state, the gas generated inside the packaging container 200 flows out into the space R3 through a gap formed between the ball 214 and the O-ring 212, and further outside the packaging body 101 through the through hole O2. To be discharged. When the gas is discharged and the force that presses the ball 214 upward is weakened, the force by which the spring 216 urges the ball 214 downward becomes larger, and the spring 216 is restored and extended. As a result, the check valve 3 is closed again.

  The valve opening pressure of the check valve 3 can be set smaller than the valve opening pressure of the release valve 1, can be set equal to the valve opening pressure of the release valve 1, or the valve opening pressure of the release valve 1. It can also be set larger. The valve opening pressure of the check valve 3 here is the same as in the case of the release valve 1, assuming that the pressure on the secondary side is atmospheric pressure (0.1 MPa). It is a value obtained by subtracting the secondary pressure from the pressure.

  As described above, in the present embodiment, the check valve 3 is disposed on the secondary side of the destruction valve 1. Therefore, even after the breaking valve 1 is cleaved, the check valve 3 can prevent the air from entering the packaging container 200 and effectively prevent deterioration of the battery due to moisture contained therein. . Therefore, the packaging body 101 which is a battery can be continuously used even after the destruction valve 1 is cleaved.

  By the way, although it can be said that the check valve 3 is a one-way valve, it cannot completely prevent the backflow by itself. Therefore, it is difficult to completely prevent the air from entering the packaging container 200 with the check valve 3 alone, and the battery may be deteriorated. In this respect, in the present embodiment, before the destruction valve 1 is opened, the presence of the destruction valve 1 completely prevents the air from entering the packaging container 200, and the deterioration of the battery due to moisture contained therein. It can be effectively prevented.

  The break valve 1 is opened when the internal pressure of the packaging container 200 becomes equal to or higher than the open pressure of the break valve 1. Therefore, after the release of the release valve 1, the internal pressure in the primary space R1 of the check valve 3 is maintained at a relatively high level, so that even a slight backflow through the check valve 3 is unlikely to occur. A state arises. Therefore, even after the destruction valve 1 is cleaved, it is possible to prevent air from entering the packaging container 200 and effectively prevent deterioration of the battery due to moisture contained therein.

  Furthermore, the packaging body 101 of the present embodiment is a battery, and a vacuum is substantially formed in the packaging container 200 before the destruction valve 1 is cleaved. Here, due to the problem of the backflow of the air described above, it is difficult to evacuate the inside of the packaging container 200 with the configuration in which the destruction valve 1 does not exist and only the check valve 3 is provided. In this respect, in the present embodiment, such vacuuming can be easily performed due to the presence of the breaker valve 1.

  Further, in the present embodiment, the check valve 3 is disposed not in the attachment portion 22 but in the cylindrical portion 20. As a result, it is possible to reduce a possibility that various components constituting the check valve 3 are deformed by heat when the attachment portion 22 is attached to the packaging container 200 by heat sealing.

<3. Operation of valve structure>
Hereinafter, the use state of the valve structure 100 will be described. The valve structure 100 is used in a state of being airtightly attached to the packaging container 200.

  As already described, the package 101 is a battery, and the packaging container 200 contains an electrolytic solution. The electrolytic solution may be vaporized or decomposed for some reason. When gas is generated inside the packaging container 200 as the electrolytic solution is vaporized or decomposed, the internal pressure of the space R1 increases. When the internal pressure of the space R1 (differential pressure with respect to the space R2) increases and reaches the valve opening pressure of the breaker valve 1, the breaker valve 1 is torn. When the destruction valve 1 is opened, the space R1 and the space R2 communicate with each other, and the gas can escape into the space R2 that was originally a closed space. As a result, the internal pressure applied to the packaging container 200 decreases.

  Once the release valve 1 is cleaved, it does not perform its function. However, since the check valve 3 exists on the secondary side of the breaker valve 1, the inside and outside of the packaging container 200 do not communicate with each other, and the state where it is difficult for the atmosphere and the moisture contained therein to enter the packaging container 200 occurs. continue. Therefore, the use of the package 101 that is a battery can be continued even after the destruction valve 1 is cleaved.

  Thereafter, the use of the packaging body 101 which is a battery is continued, and when the internal pressure of the space R1 and the space R2 (differential pressure with respect to the space R3) reaches the valve opening pressure of the check valve 3, the check valve 3 opens. . When the check valve 3 is opened, the spaces R1 and R2 further communicate with the external space via the space R3. That is, the inside and outside of the package 101 communicate with each other, and the gas generated inside the packaging container 200 is released to the external space. As a result, the internal pressure applied to the packaging container 200 decreases, and the check valve 3 returns to the closed state. Therefore, the state where it is difficult for the atmosphere and the moisture contained therein to enter the packaging container 200 is further continued, and the use of the package 101 that is a battery can be continued.

<4. Modification>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible unless it deviates from the meaning. For example, the following changes can be made. Moreover, the gist of the following modifications can be combined as appropriate.

<4-1>
In the said embodiment, although the destruction valve 1 was made into the metal plate-shaped member in which the notch part 10 was formed, the structure of the destruction valve 1 is not limited to this aspect. For example, as shown in FIG. 4A, the destruction valve can be configured by a laminate film 1 a in which the outer peripheral edge is heat-sealed at the lower end portion of the valve outer body 2. As another example, as shown in FIG. 4B, in the packaging container 200 formed of a laminate film, a break valve is configured by the heat seal portion 1b formed so as to surround the lower end portion of the valve outer body 2. You can also. In this example, the inside and the outside of the heat seal portion 1b are separated by the heat seal portion 1b so as not to communicate with gas and liquid. However, when the pressure of the space inside the heat seal portion 1b is increased by the gas generated inside the packaging container 200, the heat seal portion 1b is separated. As described above, the destruction valve can be preferably formed also by an easy peel as shown in FIGS. 4A and 4B.

<4-2>
In the above embodiment, the destruction valve 1 is arranged in the mounting portion 22, but it may be arranged in the cylindrical portion 20. In this case, it is preferable in that the possibility that the destruction valve 1 is deformed by heat at the time of attachment of the attachment portion 22 by heat sealing to the packaging container 200 is reduced. In addition, the destruction valve 1 may be disposed in the cylindrical part 20, and the tear-drop shaped attachment portion 22 may be omitted, and the packaging container 200 may be fixed to the outer peripheral surface of the cylindrical part 20 by heat sealing.

1 Destruction valve 1a Laminate film (destruction valve)
1b Heat seal part (break valve)
2 Valve body 3 Check valve 200 Packaging container L Passage

Claims (8)

A valve that forms a passage for communicating the inside and outside of a packaging container formed of a resin molded product or a film,
A break valve disposed so as to close the passage and cleaved when an internal pressure of the packaging container rises due to gas generated inside the packaging container;
It is arranged on the secondary side, which is the side facing the outside of the destruction valve in the passage, and after the destruction valve has been cleaved, the gas is supplied from the inside of the packaging container to the outside according to the internal pressure of the packaging container. A check valve to release,
An attachment portion that at least partially defines the passage and is fixed to the packaging container in a heat-sealed state while being sandwiched between the resin molded product or the film constituting the packaging container;
A cylindrical portion disposed outside the packaging container, continuous with the attachment portion, and partially defining the passage ;
The check valve is disposed in the cylindrical portion.
valve. The valve opening pressure of the destruction valve is 2/3 or less of the internal pressure resistance of the packaging container.
The valve according to claim 1. A valve according to claim 1 or 2 ,
A package comprising the packaging container. The packaging container is a pouch,
The package according to claim 3 . The internal pressure resistance of the packaging container is 1 MPa or less,
The package according to claim 3 or 4 . In the packaging container, a vacuum is substantially formed before the break valve is opened,
The package according to any one of claims 3 to 5 . The packaging container contains a battery element;
The package according to any one of claims 3 to 6 . The packaging container is a laminate container,
The package according to any one of claims 3 to 7 .