JP7206745B2 - Package with valve device and power storage device - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a package with a valve device and an electricity storage device.

BACKGROUND ART Conventionally, various types of electricity storage devices have been developed. In all electricity storage devices, packaging materials (exterior materials) are indispensable members for sealing electricity storage device elements such as electrodes and electrolytes. Conventionally, metal exterior materials have been frequently used as exterior materials for power storage devices.

On the other hand, in recent years, with the increasing performance of electric vehicles, hybrid electric vehicles, personal computers, cameras, mobile phones, etc., power storage devices are required to have various shapes, and are required to be thinner and lighter. However, conventionally widely used metallic exterior materials for electric storage devices have the drawback that it is difficult to follow the diversification of shapes and that there is a limit to weight reduction.

Therefore, in recent years, a film-like exterior material that can be easily processed into various shapes and that can realize thinness and weight reduction has been developed. A cladding material has been proposed.

In such a film-like exterior material, a recess is generally formed by cold forming, and an electricity storage device element such as an electrode or an electrolytic solution is placed in the space formed by the recess, and a heat-sealable resin is placed in the space formed by the recess. By heat-sealing the layers together, an electricity storage device in which the electricity storage device element is accommodated inside the exterior material is obtained.

On the other hand, a technique is known in which a valve device is provided in order to release gas generated inside a container such as an electricity storage device at a pressure lower than the burst pressure of the container. For example, Patent Document 1 discloses an electric double layer capacitor cell characterized by using a capacitor valve having a predetermined structure.

JP 2011-155139 A

As described above, as a package with a valve device, for example, an electricity storage device provided with a valve device in preparation for gas generation inside the electricity storage device is known.

However, an electricity storage device using a film-like exterior material has a lower mechanical strength of the exterior material than an electricity storage device using a metal container as an exterior material. As a result of studies by the present inventors, it was found that gas was generated inside the electric storage device to which the valve device was attached, the internal pressure increased, and the film-like exterior material was used until the gas was released from the valve device to the outside. When a strong force is applied from the inside of the electricity storage device used, wrinkles are formed in the exterior material, and after the gas is released from the valve device to the outside, large wrinkles are formed in the exterior material, or the exterior material is greatly deformed. It was found that a problem such as If the exterior material is greatly deformed, there is a risk that the position of the contents cannot be fixed.

In the present disclosure, when gas is generated inside a package with a valve device and the internal pressure rises, large wrinkles are formed in the exterior material after the gas is released, and the shape is greatly deformed. A main object of the present invention is to provide a package with a valve device that releases gas from the valve device to the outside at an appropriate timing.

The present inventors have made intensive studies to solve the above problems. As a result, at least, it is composed of a laminate having a base material layer, a barrier layer and a heat-fusible resin layer in this order, and a container for containing contents therein, and the container separately from the container. A valve device-equipped package comprising a valve device that communicates with the inside of the body, and further, the maximum strain in the thickness direction of the container and the opening pressure of the valve device (differential pressure between the primary side and the secondary side of the valve device) By focusing on the relationship, the maximum strain in the thickness direction of the container after the pressure inside the container rises and the gas inside the container is released from the valve device to the outside is set to less than 30% , When the internal pressure rises due to the gas generated inside the package with a valve device, before the container (that is, the exterior material) is greatly wrinkled after the gas is released, or the shape is greatly deformed. It has been found that the gas is released to the outside from the valve device at an appropriate timing. That is, when the pressure inside the package with the valve device rises, the change in the thickness of the container is observed, and the opening pressure of the valve device is adjusted so that the valve device is opened before the thickness is reduced by 30%. It has been found that such setting effectively suppresses problems such as formation of large wrinkles in the exterior material and large deformation of the shape thereof after the valve device is opened.

The present disclosure is an invention completed through further studies based on such findings. That is, the present disclosure provides inventions in the following aspects.
a container configured by a laminate having at least a substrate layer, a barrier layer, and a heat-fusible resin layer in this order, and containing a content therein;
a valve device that communicates with the inside of the container,
The valve device is configured to reduce the pressure when the pressure inside the container rises due to the gas generated inside the container,
A package with a valve device, wherein the maximum strain in the thickness direction of the container after the pressure inside the container rises and the gas inside the container is released from the valve device to the outside is less than 30%. body.

According to the present disclosure, when gas is generated inside a package with a valve device and the internal pressure rises, there is a problem that large wrinkles are formed in the packaging material after the gas is released, or the shape is greatly deformed. It is possible to provide a package with a valve device in which gas is released from the valve device to the outside at an appropriate timing before it occurs.

1 is a plan view of a package with a valve device according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1; It is a figure which shows a container. It is a figure which shows an example of the cross-sectional structure of a packaging material. 2 is a plan view of the valve device in Embodiment 1. FIG. FIG. 6 is a sectional view taken along line VI-VI of FIG. 5; FIG. 6 is a cross-sectional view taken along line VII-VII of FIG. 5; FIG. 2 is a cross-sectional view taken along the line VIII-VIII of FIG. 1, and is a diagram for explaining the mounting state of the valve device; It is a flowchart which shows the manufacturing procedure of a package with a valve apparatus. FIG. 10 illustrates the operation of placing the valve device between the flange and the packaging material; FIG. 10 is a plan view of a valve device according to Embodiment 2; FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. 11; FIG. 11 is a plan view of a valve device according to Embodiment 3; 14 is a cross-sectional view taken along line XIV-XIV of FIG. 13; FIG. FIG. 11 is a plan view of a valve device according to Embodiment 4; 16 is a cross-sectional view taken along line XVI-XVI of FIG. 15; FIG. FIG. 11 is a plan view of a valve device according to Embodiment 5; FIG. 11 is a plan view of a valve device according to Embodiment 6; FIG. 19 is a cross-sectional view taken along line XIX-XIX of FIG. 18; FIG. 11 is a plan view of a valve device in Embodiment 7; 21 is a cross-sectional view taken along line XXI-XXI of FIG. 20; FIG. It is a figure which shows the mode at the time of attachment to the container of a valve apparatus. It is a figure which shows the cross section of the valve apparatus in the modification 1. FIG. It is a figure which shows the cross section of the valve apparatus in the modified example 2. FIG. It is a figure which shows the cross section of the valve apparatus in the modified example 3. FIG. FIG. 11 is a plan view of a valve device in Modification 4; FIG. 27 is a cross-sectional view taken along line XXVII-XXVII of FIG. 26; 11 is a plan view of a packaging material in Modification 5. FIG. FIG. 29 is a cross-sectional view taken along line XXIX-XXIX of FIG. 28; It is a schematic diagram of the valve apparatus used in the Example. It is a schematic diagram which shows a crystal grain in the cross section of the thickness direction of aluminum foil. FIG. 10 illustrates the operation of placing the valve device between the flange and the packaging material; 1 is a cross-sectional view of a valve device; FIG.

A package with a valve device of the present disclosure includes a container and a valve device. The container is composed of a laminate having at least a substrate layer, a barrier layer and a heat-fusible resin layer in this order. The container accommodates the contents inside. The valve device communicates with the interior of the container. The valve device is configured to reduce the pressure inside the container when the pressure inside the container rises due to the gas generated inside the container. Furthermore, the maximum strain in the thickness direction of the container is less than 30% after the pressure inside the container rises and the gas inside the container is released from the valve device to the outside. That is, in the package with the valve device of the present disclosure, the opening pressure of the valve device is set such that the maximum strain in the thickness direction is less than 30%.

Since the package with a valve device of the present disclosure has such characteristics, when gas is generated inside the package and the internal pressure rises, the exterior material after the release of the gas wrinkles greatly. The gas is released from the valve device to the outside at an appropriate timing before the formation of the gas or the occurrence of a problem such as a large deformation of the shape.

Hereinafter, the package with valve device of the present disclosure will be described in detail. In this specification, the numerical range indicated by "-" means "more than" and "less than". For example, the notation of 2 to 15 mm means 2 mm or more and 15 mm or less. Further, specific embodiments of the valve device, which will be described later, will be described in detail with reference to the drawings. The same reference numerals are given to the same or corresponding parts in the drawings, and the description thereof will not be repeated.

In the valve device-equipped package of the present disclosure, the container is composed of a laminate having a substrate layer, a barrier layer, and a heat-fusible resin layer in this order. A valve device is attached to the container, and the maximum thickness of the container in the thickness direction after the pressure inside the container rises and the gas inside the container is released from the valve device to the outside. Strain (hereinafter sometimes referred to as “maximum strain X”) is set to less than 30%. In the present disclosure, focusing on the relationship between the maximum strain X of the container and the opening pressure of the valve device, by setting the maximum strain X to less than 30%, the internal pressure caused by the gas generated inside the package rises, the gas is released from the valve device to the outside at an appropriate timing before large wrinkles are formed in the container after the gas is released or the shape is greatly deformed. That is, when the pressure inside the package with the valve device rises, the change in the thickness of the container is observed, and the opening pressure of the valve device is adjusted so that the valve device is opened before the thickness is reduced by 30%. By setting, after the valve device is opened, problems such as formation of large wrinkles in the exterior material and large deformation of the shape can be effectively suppressed.

The upper limit of the maximum strain X is preferably about 28% or less, more preferably 27% or less. Moreover, the lower limit of the maximum strain X is preferably about 2% or more, more preferably about 4% or more. By setting the maximum strain X to such a value, the gas can be released to the outside at a more appropriate timing before large wrinkles are formed in the container after the gas is released and the shape is greatly deformed. can be done. A preferable range of the maximum strain X is about 2% or more and less than 30%, and about 4% or more and 28% or less.

<Measurement of maximum strain X>
The maximum strain X of the container is measured as follows. First, two identical packages whose maximum strain X is to be measured are prepared. Next, lines are drawn in a grid pattern at 1 mm intervals on the outer surface of each package (that is, the outer surface of the container). At this time, the positions of the lines drawn on the outer surfaces of the two packages are the same. Next, for one of the packages, the valve device is sealed to provide another ventilation path in the container, or the valve function is removed from the valve device to provide a ventilation path, and air is allowed to enter the package through the ventilation path. Then, the internal pressure is raised to 1 MPa to inflate the package. Next, air is removed from the air passage to normal pressure, the package is cut along the grid lines, and the thickness of the cross section is measured. The package to which air was not sent is also cut along the grid-like lines, and the thickness of the cross section is measured. Next, based on the thickness at the same position of the package to which air was not sent, the portion where the thickness was the thinnest was the maximum strain point, and the reduction rate (%) of the thickness at the maximum strain point was the maximum strain X ( %). For example, if the thickness of the portion of the package whose internal pressure is not increased is 100 μm at the maximum strain point, and the thickness of the portion of the package whose internal pressure is increased is 70 μm, the maximum strain X is 30%. be.

The valve device has a secondary side located outside of the enclosure (i.e., the external environment) and a primary side located inside the enclosure, and the gas generated inside the enclosure causes a When the pressure inside the container rises, it is configured to reduce the pressure (that is, the gas generated inside the container is released from the primary side to the secondary side). A preferred form of construction for the valve device is described below.

The differential pressure between the primary side and the secondary side of the valve device (that is, the opening pressure of the valve device) may be set within the above range according to the type of package, etc., but the lower limit is about 0.00. 0.015 MPa or more, preferably about 0.1 MPa or more, and the upper limit is about 0.6 MPa or less, preferably about 0.3 MPa. 015 to 0.3 MPa, 0.1 to 0.6 MPa, and 0.1 to 0.3 MPa. For example, when the package is a package containing contents, it is particularly preferable to set the differential pressure between the primary side and the secondary side of the valve device to these values. The differential pressure between the primary side and the secondary side of the valve device is set in a room temperature (25°C) environment.

The differential pressure between the primary side and the secondary side of the valve device is measured by the following method.

<Method of measuring the differential pressure between the primary and secondary sides of the valve device>
The valve device is installed on a measuring jig made of metal, a compressed air cylinder is installed on the primary side of the jig through a small pressure gauge, a rubber tube is installed on the secondary side, and a water tank is attached to the tip of the rubber tube. to be installed. At this time, confirm in advance that there is no leakage from jigs and contacts. Air is gradually fed into the valve device from the primary air cylinder, and the pressure at which air bubbles start to form from the rubber tube of the water tank is read with a pressure gauge to measure the differential pressure between the primary and secondary sides of the valve device.

In the valve device-equipped package of the present invention, the set pressure inside the container is preferably set to a certain pressure or less. The set value of the internal pressure is appropriately set according to the type of package with a valve device, but is preferably about 0.1 MPa or less, more preferably about 1.0×10 ⁻² MPa or less. 1.0×10 ⁻¹⁰ MPa or more is mentioned, and the preferable range of the internal pressure is about 1.0×10 ⁻¹⁰ to 0.1 MPa, 1.0×10 ⁻¹⁰ to 1.0×10 ⁻² . about MPa.

The differential pressure between the primary side and the secondary side of the valve device (opening pressure of the valve device) can be set by a known method. For example, the materials, shapes, and sizes of the members that make up the valve mechanism of the valve device (for example, balls, valve seats (such as O-rings), springs, and vents, which will be described later), and the force of the springs pressing the balls, etc. By designing the differential pressure can be adjusted.

In the present disclosure, the valve device is preferably a check valve. That is, in the valve device-equipped package of the present disclosure, when the internal pressure rises, the timing is appropriate before problems such as the formation of large wrinkles in the exterior material after the release of gas and the large deformation of the shape occur. Since the gas is released from the valve device to the outside, a check valve that can be repeatedly used even after the gas is released is suitable as the valve device.

In addition, in the package with a valve device of the present disclosure, when the valve function of the valve device is closed to increase the pressure inside the container in an environment of, for example, 80° C., the container bursts. The pressure inside the body (that is, the internal pressure at which the bag is broken) is, for example, greater than the differential pressure between the primary side and the secondary side of the valve device, and can be, for example, within the range of 0.3 MPa or more and 1 MPa or less. . Since the valve device-equipped package containing body of the present disclosure is composed of a laminate having at least a substrate layer, a barrier layer, and a heat-fusible resin layer in this order, considering the thickness and strength of the containing body, About the bag-breaking internal pressure, the appropriate range is appropriate. The bag-breaking internal pressure is adjusted by the sealing strength of the heat-fusible resin layer, the thickness of the package, and the like. The internal pressure of the valve-equipped package is measured by the method described in Examples.

Preferred embodiments of the valve device attached to the package of the present disclosure and the structure of the package will be exemplified below.

Preferably, the valve device includes a first portion and a second portion. The first portion is a portion in which a valve mechanism is formed to reduce the pressure inside the container when the pressure inside the container rises due to the gas generated inside the container. The second part is a part in which an air passage is formed for guiding the gas generated inside the container to the valve mechanism.

The containing body of the packaging body of the present disclosure is composed of a laminate having at least a substrate layer, a barrier layer and a heat-fusible resin layer in this order. As a more specific embodiment, the heat-fusible resin layers face each other at the periphery of the container, and the heat-fusible resin layers facing each other are fused together to form a peripheral joint on the periphery of the container. It is Preferably, in the valve device, the first portion is located outside the edge of the peripheral joint. Moreover, at least part of the second portion is preferably sandwiched between the heat-fusible resin layers at the peripheral joint portion.

In this package with a valve device, it is the second portion of the valve device that is sandwiched between the heat-fusible resin layers at the peripheral joint, and the first portion of the valve device is sandwiched between the heat-fusible resin layers. preferably not. In this valve device-equipped package, when the opposing heat-fusible resin layers are fused, the first portion is not subjected to greater pressure and heat than the second portion. As a result, according to this valve device, it is possible to suppress the failure of the valve mechanism in the first portion due to the pressure and heat applied when the opposing heat-fusible resin layers are fused.

Preferably, in the thickness direction of the package, the length of the first portion is longer than the length of the second portion, and a step may be formed at the boundary between the first portion and the second portion.

In this valve device-equipped package, the first portion is longer than the second portion at least in the thickness direction of the valve device-equipped package, and a step is formed at the boundary between the first portion and the second portion. preferable. Therefore, in the valve device-equipped package, even if the valve device is pushed too far toward the container when the second portion is sandwiched between the heat-sealable resin layers in the manufacturing process of the valve device-equipped package, the stepped portion is laminated. Get caught on the edge of the body. Therefore, according to this package with a valve device, it is possible to prevent the first portion from being erroneously sandwiched between the heat-fusible resin layers in the manufacturing process of the package with a valve device. In addition, in this valve device-equipped package, compared to the case where no step is provided at the boundary between the first portion and the second portion, the valve at the portion of the peripheral joint where the second portion is sandwiched The difference between the length in the thickness direction of the package with the device and the length in the thickness direction of the package with the valve device at the portion of the peripheral joint where the second portion is not sandwiched is small. Therefore, the heat-fusible resin layers are fused together without applying an excessive amount of heat or pressure to the heat-fusible resin layers at the portion where the second portion is sandwiched in the peripheral joint portion. As a result, according to this package with a valve device, it is possible to suppress deterioration in seal strength and insulation due to thinning of the heat-fusible resin layer. Here, the deterioration of insulation is a phenomenon in which electricity is generated between the barrier (metal) layer and the content (for example, electrolyte) due to partial thinning or cracking of the heat-fusible resin.

Further, preferably, the length of the second portion in the width direction of the package with the valve device may be longer than the length of the second portion in the thickness direction of the package with the valve device.

In this valve device-equipped package, the length of the second portion in the thickness direction of the valve device-equipped package is shorter than when the second portion has a circular cross-sectional shape (with the same area). That is, in this package with a valve device, the length in the thickness direction of the portion of the peripheral joint where the second portion is sandwiched, and the length of the peripheral joint where the second portion is sandwiched. The difference in length in the thickness direction of the package with the valve device at the portion without the valve device is small. Therefore, the heat-fusible resin layers are fused together without applying an excessive amount of heat or pressure to the heat-fusible resin layers at the portion where the second portion is sandwiched in the peripheral joint portion. As a result, according to this package with a valve device, it is possible to suppress deterioration in seal strength and insulation due to thinning of the heat-fusible resin layer.

Moreover, it is particularly preferable that the second portion has a wing-shaped extended end portion which is formed thinner toward the end portion in the width direction of the package with the valve device.

In this valve device-equipped package, compared to the case where the second portion is not provided with the wing-shaped extended end portion, the portion of the peripheral joint where the second portion is not sandwiched from the second portion of the peripheral joint. The change in the thickness direction of the package with the valve device is smooth at the position where the portion transitions to the sandwiched portion. Therefore, no excessive force is applied to the laminate at the boundary between the position where the second portion is sandwiched between the heat-fusible resin layers and the position where the second portion is not sandwiched between the heat-fusible resin layers. As a result, according to this package with a valve device, it is possible to appropriately fuse the heat-fusible resin layer without applying an excessive amount of heat or pressure. can be suppressed.

Moreover, preferably, the cross-sectional shape of the air passage may be circular.

Preferably, the cross-sectional length of the air passage in the width direction of the package with the valve device may be longer than the length of the cross section of the air passage in the thickness direction of the package with the valve device.

The second portion may also have pillars formed within the air passage.

When pillars are formed in the ventilation path of the second portion, the ventilation path is maintained even if pressure and heat are applied to the second portion sandwiched between the opposing heat-fusible resin layers. Therefore, according to this package with a valve device, it is possible to suppress breakage of the air passage in the second portion when the opposing heat-fusible resin layers are fused.

Also, preferably, the outer surface of the second portion may be pear-finished.

In this package with a valve device, since the outer surface of the second portion is pear-finished, the heat-sealable resin is likely to melt at the position in contact with the second portion. Therefore, according to this package with a valve device, the second portion of the valve device can be firmly fixed to the container as compared with the case where the outer surface of the second portion is smooth.

Further, preferably, at least one protruding portion extending in the circumferential direction may be formed on the outer surface of the second portion.

Since the ridges are in reliable contact with the heat-fusible resin layer, they are easily fused to the laminate. In this valve device-equipped package, the ridge portion extends in the circumferential direction of the outer surface of the second portion. Therefore, according to this package with a valve device, the heat-fusible resin layer and the second portion can be fused together in the circumferential direction of the second portion. In addition, in this valve device-equipped package, the contact area between the outer surface of the second portion and the heat-sealable resin is larger than in the case where the second portion is not formed with the ridges. . Therefore, according to this package with a valve device, the second portion of the valve device can be relatively firmly fixed to the container. Also, by providing a plurality of ridges, it is possible to further strengthen the fixation of the second portion to the container.

Further, preferably, in the second portion, the corner of the end portion on the side opposite to the first portion side in plan view may be rounded.

According to this package with a valve device, for example, when the end on the side opposite to the first portion is positioned inside the container, the end may damage the packaging element with the valve device inside the container. Possibility can be reduced. Moreover, according to this valve device-equipped package, it is possible to reduce the possibility that the end portion damages the heat-fusible resin layer inside the container and lowers the insulation properties of the heat-fusible resin layer. can.

Further, preferably, the cross section of the second portion normal to the center line of the air passage may have a polygonal shape, and the corners of the polygon may be rounded.

According to this package with a valve device, for example, when the end of the second portion opposite to the first portion is located inside the container, the portion of the second portion located inside the container can reduce the possibility of damaging the contents in the container (e.g., electricity storage device element), and the portion sandwiched between the heat-fusible resin layers of the second portion can prevent the heat-fusible resin layer from being damaged. It is possible to reduce the possibility of scratching and degrading the insulation of the heat-fusible resin layer. Further, according to this package with a valve device, for example, when the end portion of the second portion opposite to the first portion side is sandwiched between the heat-fusible resin layers, the second portion can be heat-sealed. It is possible to reduce the possibility of damaging the heat-fusible resin layer and lowering the insulating properties of the heat-fusible resin layer.

Also preferably, each of the first and second portions is made of a different material, and the melting point of the material of the first portion may be higher than the melting point of the material of the second portion. Materials for the first portion and the second portion are not particularly limited, and examples thereof include resins such as polypropylene (PP), fluorine-based resins, polyester-based resins, polyimide-based resins, polycarbonate-based resins, acrylic resins, stainless steel, and the like. Metals such as aluminum can be mentioned.

In this valve device-equipped package, even if pressure and heat are applied to the second portion when the opposing heat-fusible resin layers are fused, the melting point of the material of the first portion does not exceed the melting point of the material of the second portion. , the first portion is less likely to deform due to heat. Therefore, according to this package with a valve device, it is possible to suppress failure of the valve mechanism in the first portion when the opposing heat-fusible resin layers are fused.

Moreover, preferably, at least a portion of the outer surface of at least one of the first and second portions may be formed with a flat surface.

In this valve device-equipped package, since the flat surface is formed on the outer surface of the valve device, the valve device is prevented from rolling. Therefore, according to this valve device-equipped package, since the valve device does not roll when it is attached to the container, the valve device can be easily positioned.

Specific embodiments of the package with a valve device and the valve device of the present disclosure are illustrated below. In the following embodiments, the valve device-equipped package is an electricity storage device in which an electricity storage device element is housed in a container as a content. However, the package with a valve device and the valve device of the present disclosure are not limited to the following.

[1. Embodiment 1]
<1-1. Overview of package with valve device>
FIG. 1 is a plan view of package 10 with a valve device according to the first embodiment. FIG. 2 is a sectional view taken along line II-II of FIG. In package 10 with a valve device, the positive electrode and the negative electrode of tab 300 are arranged on opposite sides. It is a form that considers for electric vehicles such as electric vehicles and hybrid vehicles.

As shown in FIGS. 1 and 2 , the valve device-equipped package 10 includes a container 100 , a content 400 , a tab 300 , a tab film 310 and a valve device 200 . The containing body 100 has a rectangular shape in plan view, and the valve device 200 exists at a position different from the side of the containing body 100 on which the tab 300 exists. Note that the container 100 is not limited to a rectangular shape in plan view, and may be circular in plan view, L-shaped in plan view, or indefinite shape in plan view, for example. As described above, in the present invention, the maximum strain X of the container 100 is measured by the above-described measuring method, so regardless of the shape of the container 100, the maximum strain X can be confirmed by the above method. can. For example, in a vehicle-mounted or stationary medium-sized or large-sized power storage device, the valve device 200 is preferably provided on the periphery of the container 100 because the cells are stacked to form a module. Furthermore, if the valve device 200 is attached to the same side as the side on which the tab 300 is located in the containing body 100 having a rectangular shape in plan view, the tab 300 and the valve device 200 can be attached at the same time, resulting in excellent production efficiency. there is On the other hand, if the valve device 200 is attached to a side different from the side on which the tab 300 is located, as shown in FIG. etc. is suppressed.

The container 100 includes packaging materials 110,120. At the periphery of container 100, packaging materials 110 and 120 are heat-sealed to form peripheral joint 130. As shown in FIG. That is, the packaging materials 110 and 120 are fused together at the peripheral edge joint 130 . The packaging materials 110, 120 are described in greater detail below.

The content 400 is, for example, an electricity storage member (electricity storage device element) such as a lithium ion electricity storage device or a capacitor. Contents 400 are accommodated inside container 100 . When the content 400 is an electricity storage device element, gas may be generated in the container 100 when an abnormality occurs in the electricity storage device element. Further, for example, if the content 400 is a capacitor, gas may be generated inside the container 100 due to chemical reactions in the capacitor.

Tab 300 is a metal terminal used for power input/output when content 400 is an electrical storage device element. One end of the tab 300 is electrically connected to the electrode (positive electrode or negative electrode) of the contents 400 (power storage device element), and the other end protrudes outward from the edge of the container 100 .

The metal material forming tab 300 is, for example, aluminum, nickel, copper, or the like. For example, when the content 400 (electricity storage device element) is a lithium ion electricity storage device, the tab 300 connected to the positive electrode is usually made of aluminum or the like, and the tab 300 connected to the negative electrode is usually made of copper, nickel, or the like. etc.

Two tabs 300 are included in the valve-equipped package 10 . One tab 300 is sandwiched between packaging materials 110 and 120 via a tab film 310 at the end of the container 100 in the direction of arrow L. As shown in FIG. The other tab 300 is sandwiched between packaging materials 110 and 120 via a tab film 310 at the end of container 100 in the arrow R direction.

Tab film 310 is an adhesive protective film and is configured to adhere to both packaging material 110, 120 and tab 300 (metal). By interposing the tab film 310, the metal tab 300 can be fixed with the packaging material 110,120. Moreover, when the tab film 310 is used at a high voltage, it preferably contains a heat-resistant layer or a heat-resistant component and has a short-circuit prevention function.

The valve device 200 communicates with the inside of the container 100, and when the pressure inside the container 100 becomes equal to or higher than a predetermined value due to the gas generated inside the container 100, the gas inside the container 100 is released. is configured to release to the outside. The housing of the valve device 200 is preferably made of a material that directly adheres to the innermost layers of the packaging materials 110 and 120, and is made of a resin having the same thermal adhesiveness as the innermost layers of the packaging materials 110 and 120, such as polypropylene (PP). It is preferable that it is made of a resin such as. If a different material other than PP is used for reasons such as heat resistance, it is effective to seal by interposing a film that can be adhered to both the different material and PP in the same manner as the tab film used for the tab. . The end side of the valve device 200 in the arrow B direction is sandwiched between the packaging materials 110 and 120 on the end side of the container 100 in the arrow F direction. The valve device 200 will be described later in detail.

In the package 10 with a valve device according to the first embodiment, various structural ideas are employed in attaching the valve device 200 to the container 100 . Hereinafter, the configuration of the container 100, the configuration of the valve device 200, the mounting state of the valve device 200 to the container 100, and the method of manufacturing the package 10 with the valve device will be described in order.

The direction indicated by each arrow LRUDFB is common in each drawing. Hereinafter, the direction of the arrow LR is also referred to as "the width direction of the package 10 with the valve device", and the direction of the arrow UD is also referred to as the "thickness direction of the package 10 with the valve device".

<1-2. Configuration of container>
FIG. 3 is a diagram showing the container 100. As shown in FIG. As shown in FIG. 3, container 100 includes packaging materials 110,120. Each of the packaging materials 110 and 120 is composed of a so-called laminate film, and has substantially the same rectangular shape in plan view.

The packaging material 110 includes a molded portion 112 molded to form a space S1, and a flange portion 114 extending from the molded portion 112 in the arrow FB direction and the arrow LR direction. In the molding portion 112, the surface in the arrow U direction is open. Contents 400 (FIG. 1) are placed in space S1 through the open surface.

FIG. 4 is a diagram showing an example of a cross-sectional structure of packaging materials 110 and 120. As shown in FIG. As shown in FIG. 4, each of the packaging materials 110 and 120 is a laminate in which a substrate layer 31, an adhesive layer 32, a barrier layer 33, an adhesive layer 34 and a heat-fusible resin layer 35 are laminated in this order. is. Each of the packaging materials 110 and 120 does not necessarily need to include each layer shown in FIG. good.

In the container 100, the base material layer 31 is the outermost layer, and the heat-fusible resin layer 35 is the innermost layer. At the time of assembling the packaging body 10 with a valve device, the heat-sealable resin layer positioned on the periphery of each of the packaging materials 110 and 120 with the contents 400 (Fig. 2) arranged in the space S1 (Fig. 3). By heat-sealing the 35 together, a peripheral joint 130 is formed, the contents 400 are sealed in the container 100, the valve device 200 is fused and fixed to the peripheral joint 130, and the tab 300 are also fused and fixed to the peripheral joint portion 130 via the tab film 310 . Each layer included in the packaging materials 110 and 120 will be described below. The thickness of the packaging materials 110 and 120 is, for example, approximately 50 to 250 μm, preferably approximately 90 to 200 μm.

(1-2-1. Base layer)
The base material layer 31 is a layer that functions as a base material for the packaging materials 110 and 120 and is a layer that forms the outermost layer side of the container 100 .

The material forming the base layer 31 is not particularly limited as long as it has insulating properties. Materials for forming the base material layer 31 include, for example, polyester, polyamide, epoxy, acrylic, fluororesin, polyurethane, silicon resin, phenol, polyetherimide, polyimide, polycarbonate, mixtures and copolymers thereof, and the like. . The base material layer 31 may be, for example, a resin film formed of the above resin, or may be formed by applying the above resin. The resin film may be an unstretched film or a stretched film. Examples of stretched films include uniaxially stretched films and biaxially stretched films, with biaxially stretched films being preferred. Examples of stretching methods for forming a biaxially stretched film include successive biaxial stretching, inflation, and simultaneous biaxial stretching. Furthermore, the base material layer 31 may be a single layer, or may be composed of two or more layers. When the substrate layer 31 is composed of two or more layers, the substrate layer 31 may be a laminate obtained by laminating resin films with an adhesive or the like, or may be formed by co-extrusion of resin to form two or more layers. It may also be a laminate of resin films. A laminate of two or more resin films formed by coextrusion of resin may be used as the base material layer 31 without being stretched, or may be used as the base material layer 31 by being uniaxially or biaxially stretched. Specific examples of the laminate of resin films in which the substrate layer 31 has two or more layers include a laminate of a polyester film and a nylon film, a laminate of nylon films of two or more layers, and a laminate of polyester films of two or more layers. etc., preferably a laminate of a stretched nylon film and a stretched polyester film, a laminate of two or more layers of stretched nylon films, and a laminate of two or more layers of stretched polyester films. For example, when the substrate layer 31 is a laminate of two layers of resin films, a laminate of polyester resin films and polyester resin films, a laminate of polyamide resin films and polyamide resin films, or a laminate of polyester resin films and polyamide resin films. A laminate is preferred, and a laminate of polyethylene terephthalate film and polyethylene terephthalate film, a laminate of nylon film and nylon film, or a laminate of polyethylene terephthalate film and nylon film is more preferred. Moreover, the polyester resin is preferably located in the outermost layer of the base material layer 31 .

The thickness of the base material layer 31 is, for example, approximately 3 to 50 μm, preferably approximately 10 to 35 μm.

(1-2-2. Adhesive layer)
The adhesive layer 32 is a layer arranged on the base material layer 31 as necessary in order to impart adhesiveness to the base material layer 31 . That is, the adhesive layer 32 is provided between the base material layer 31 and the barrier layer 33 as necessary.

The adhesive layer 32 is made of an adhesive capable of bonding the base layer 31 and the barrier layer 33 together. The adhesive used to form the adhesive layer 32 may be a two-component curing adhesive or a one-component curing adhesive. Also, the adhesion mechanism of the adhesive used to form the adhesive layer 32 is not particularly limited, and may be any of a chemical reaction type, a solvent volatilization type, a heat melting type, a thermocompression bonding type, and the like.

The thickness of the adhesive layer 32 is, for example, approximately 1 to 10 μm, preferably approximately 2 to 5 μm.

(1-2-3. Barrier layer)
The barrier layer 33 is a layer having a function of improving the strength of the packaging materials 110 and 120 and preventing water vapor, oxygen, light, etc. from entering the package 10 with a valve device. Examples of the metal forming the barrier layer 33 include aluminum, stainless steel, titanium, and the like, preferably aluminum. The barrier layer 33 can be formed of, for example, a metal foil, a metal vapor deposition film, an inorganic oxide vapor deposition film, a carbon-containing inorganic oxide vapor deposition film, or a film provided with these vapor deposition films. It is more preferable to form it with an aluminum foil. From the viewpoint of preventing the occurrence of wrinkles and pinholes in the barrier layer 33 during the manufacture of each packaging material, the barrier layer is made of, for example, annealed aluminum (JIS H4160: 1994 A8021H-O, JIS H4160: 1994 A8079H-O, JIS H4000:2014 A8021P-O, JIS H4000:2014 A8079P-O) and other soft aluminum foils are more preferable.

It is particularly preferable that the barrier layer 33 is made of an aluminum foil having an average crystal grain size of 20 μm or less. Such an aluminum foil has excellent formability. The average crystal grain size of the aluminum foil is obtained by observing the cross section of the aluminum foil in the thickness direction with a scanning electron microscope (SEM), and 100 aluminum alloy crystal grains 33a located within the field of view are shown in the schematic diagram of FIG. As shown, when the straight line distance connecting the leftmost end of each crystal grain in the direction perpendicular to the thickness direction and the rightmost end in the direction perpendicular to the thickness direction is the maximum diameter x, 100 crystal grains Means the average value of the maximum diameter x. Since FIG. 31 is a schematic diagram, drawing is omitted and 100 crystal grains 33a are not drawn.

The thickness of the barrier layer 33 is not particularly limited as long as it functions as a barrier layer against water vapor. In addition, when the package with a valve device is a medium-sized or large-sized power storage device for vehicle use, stationary use, etc., from the viewpoint of ensuring high strength while forming a sufficiently large molded part in the container, The thickness of the barrier layer 33 is preferably about 30-100 μm.

(1-2-4. Adhesive layer)
The adhesive layer 34 is a layer provided as necessary between the barrier layer 33 and the heat-fusible resin layer 35 in order to firmly bond the heat-fusible resin layer 35 .

The adhesive layer 34 is made of an adhesive capable of bonding the barrier layer 33 and the heat-fusible resin layer 35 together. Although the composition of the adhesive used to form the adhesive layer 34 is not particularly limited, it is, for example, a resin composition containing acid-modified polyolefin. The acid-modified polyolefin is not particularly limited as long as it is an acid-modified polyolefin, but preferably includes a polyolefin graft-modified with an unsaturated carboxylic acid or its anhydride.

The thickness of the adhesive layer 34 is, for example, approximately 1 to 50 μm, preferably approximately 2 to 40 μm.

(1-2-5. Heat-fusible resin layer)
The heat-fusible resin layer 35 forms the innermost layer of the container 100 . The heat-fusible resin layer 35 seals the contents 400 inside the container 100 by being heat-sealed with the opposing heat-fusible resin layer at the periphery of the container 100 . In addition, by covering the barrier layer with a certain film thickness or more of the heat-fusible resin, the insulation between the electrolytic solution and the barrier layer metal can be maintained.

The resin component used for the heat-sealable resin layer 35 is not particularly limited as long as it is heat-sealable. Examples thereof include polyolefins and acid-modified polyolefins.

Polyolefins include, for example, polyethylene such as low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene; homopolypropylene, block copolymers of polypropylene (e.g., block copolymers of propylene and ethylene), random copolymers of polypropylene ( Examples include crystalline or amorphous polypropylene such as random copolymer of propylene and ethylene; terpolymer of ethylene-butene-propylene; Among these polyolefins, polyethylene and polypropylene are preferred. The acid-modified polyolefin is not particularly limited as long as it is an acid-modified polyolefin, but preferably includes a polyolefin graft-modified with an unsaturated carboxylic acid or its anhydride.

The thickness of the heat-fusible resin layer 35 is not particularly limited. More preferably about 15 to 90 μm, more preferably about 30 to 80 μm.

The heat-fusible resin layer preferably exhibits a melting peak in the range of 150 to 165° C. when measured with a differential scanning calorimeter. Medium-sized and large-sized power storage devices for vehicles and stationary use have large capacities. In addition, the capacitor is capable of inputting and outputting a large current and a high output. Therefore, these power storage devices tend to generate heat more easily than, for example, mobile batteries, and the environment in which they are installed may become hot. By observing the melting peak of the heat-fusible resin layer in the above range, it is possible to ensure sufficient adhesion of the heat-fusible resin layer in these electric storage devices.

<1-3. Configuration of valve device>
FIG. 5 is a plan view of the valve device 200. FIG. As shown in FIG. 5, valve device 200 includes valve function portion 210 and seal mounting portion 220 . Although the details will be described later, at least a part of the seal attachment portion 220 is a portion that is sandwiched and fixed between the packaging materials 110 and 120 (FIG. 2), and is heat-sealed so that the seal attachment portion The outer peripheral surface of the packaging material 220 and the heat-fusible resin layer 35, which is the innermost layer of the packaging materials 110, 120, are fused and joined.

In the seal mounting portion 220, the corner of the end in the arrow B direction is rounded. That is, in the seal mounting portion 220, the corner of the end portion opposite to the valve function portion 210 side in plan view is rounded (for example, R=0.2 mm to 2.0 mm). In the present disclosure, rounded corners are expressed as "R is formed". Here, "R is formed" means a state in which the corners are rounded, structurally similar to chamfering. Used to mean the radius of the corner roundness. It is possible to chamfer the sharp corners generated in the manufacturing process of the valve device 200 to round the corners (to form an R), but the housing of the valve device 200 is a resin molded product. , it is also possible to form the radius without chamfering such as cutting by molding so as to have rounded corners from the beginning.

FIG. 6 is a sectional view taken along line VI-VI in FIG. As shown in FIG. 6, in the valve device 200, each of the valve function portion 210 and the seal attachment portion 220 has a circular cross-section, and the seal attachment portion 220 defines an air passage A1. The cross section of the ventilation path A1 is circular. Although FIG. 6 illustrates the case of having a circular cross section, the cross sectional shape is not particularly limited, and may be an elliptical shape, a square shape, or the like.

In the valve device 200, the length L2 of the valve function portion 210 in the thickness direction (arrow UD direction) of the valve device-equipped package 10 is longer than the length L1 of the seal attachment portion 220 in the thickness direction of the valve device-equipped package 10. long. The length L2 of the valve function portion 210 in the width direction (arrow LR direction) of the valve device-equipped package 10 is longer than the length L1 of the seal attachment portion 220 in the width direction of the valve device-equipped package 10 . That is, the cross-sectional diameter of the valve function portion 210 is longer than the cross-sectional diameter of the seal mounting portion 220 . As a result, a step is formed at the boundary between the valve function portion 210 and the seal mounting portion 220 (FIG. 5).

FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. As shown in FIG. 7, the seal mounting portion 220 has an R (for example, R=0.2 mm to 2.0 mm) formed at the end in the arrow B direction. Further, inside the seal attachment portion 220, an air passage A1 is formed. Ventilation path A<b>1 , for example, guides gas generated inside container 100 to valve function unit 210 .

Inside the valve function unit 210, there is provided a valve mechanism configured to discharge gas generated in the container 100 (FIG. 1). Specifically, valve function 210 includes valve seat 212 , ball 214 , spring 216 and membrane 218 . That is, the valve function portion 210 is provided with a ball spring type valve mechanism. The valve mechanism provided in the valve function unit 210 is not particularly limited as long as it can reduce the pressure inside the containing body 100 that has risen due to gas. It may be a valve mechanism such as a mold. Also, the valve seat 212 may be, for example, an O-ring, or the portion of the seal mounting portion 220 that contacts the ball 214 may be the valve seat 212 . When a portion of the seal mounting portion 220 is used as the valve seat 212, the seal mounting portion 220 and the valve seat 212 are integrated.

The valve seat is made of an elastic material such as fluororubber, a metal such as stainless steel, a resin, or the like. The surface of the valve seat may be coated with PTFE or the like. Also, the ball 214 may be made of an elastic material such as fluororubber. The ball 214 may be made of metal such as stainless steel or resin. Spring 216 is made of, for example, stainless steel. Membrane 218 is, for example, a PTFE membrane that has a pore diameter of about 10 ⁻² to 10 ⁰ μm, does not leak electrolyte and allows only gas to permeate (selectively permeate). PTFE means polytetrafluoroethylene. In addition, since the PTFE membrane is a soft material, if the strength is insufficient, it can be reinforced by being integrally molded with mesh or non-woven fabric such as polypropylene or polyester. For example, FIG. 7 shows a diagram in which the membrane 218 is provided in the valve function unit 210. However, from the viewpoint of suppressing the intrusion of liquid (for example, electrolytic solution) into the valve function unit 210, the membrane Preferably, 218 is provided in the seal mounting portion 220 (eg, airway A1). If the electrolyte or the like adheres to the valve function portion 210, the valve function may be hindered by the crystal components of the electrolyte or the like.

With the valve device 200 attached to the container 100, when the pressure inside the container 100 reaches a predetermined pressure, the gas guided from the air passage A1 presses the ball 214 in the arrow F direction. When the ball 214 is pressed and the spring 216 is compressed, the gas in the container 100 passes through the gap formed between the ball 214 and the valve seat 212, permeates the membrane 218, and exits the container 100 through the exhaust port O1. is discharged to the outside of the Incidentally, as shown in FIG. 33, it is also preferable to provide the membrane 218 in a region below the valve seat 212 (for example, the seal mounting portion 220).

<1-4. Mounting state of the valve device>
FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 1, and is a diagram for explaining the mounting state of the valve device 200. As shown in FIG. As shown in FIG. 8 , the valve function portion 210 of the valve device 200 is positioned outside the edge of the peripheral joint portion 130 . On the other hand, a portion of the seal attachment portion 220 of the valve device 200 is sandwiched between the heat-fusible resin layer 35 of the packaging material 110 and the heat-fusible resin layer 35 of the packaging material 120 at the peripheral joint portion 130. , the outer peripheral surface of the seal attachment portion 220 and the heat-fusible resin layer 35, which is the innermost layer of the packaging materials 110, 120, are fused and joined. 8 shows that the valve device 200 is fused and joined to the heat-fusible resin layer 35, which is the innermost layer of the packaging materials 110, 120. Although the adhesive resin layer 35 is partially illustrated only in the vicinity of the peripheral joint portion 130 , the heat-sealable resin layer 35 is provided on the entire surface of the packaging materials 110 and 120 .

In package 10 with a valve device according to Embodiment 1, seal attachment portion 220 is sandwiched between heat-fusible resin layers 35 at peripheral joint portion 130 , and valve function portion 210 is sandwiched between heat-fusible resin layers 35 at peripheral joint portion 130 . The reason why it is not sandwiched between the layers 35 will be explained below.

Suppose that the valve function part 210 is sandwiched between the heat-fusible resin layers 35 at the peripheral joint part 130 . In this case, when the heat-sealing resin layers 35 are fused together (heat-sealed) at the peripheries of the packaging materials 110 and 120, the heat and pressure applied may cause the valve mechanism in the valve function portion 210 to malfunction. there's a possibility that.

In package 10 with a valve device according to the first embodiment, seal attachment portion 220 is sandwiched between heat-fusible resin layers 35 at peripheral joint portion 130, and valve function portion 210 is heat-fusible resin. It is not sandwiched between layers 35 . Therefore, in the package 10 with a valve device, large pressure and heat are not applied to the valve function part 210 during heat sealing. That is, in the package 10 with a valve device, the valve function part 210 is not sandwiched between the heat-sealable resin layers 35, thereby suppressing failure of the valve mechanism due to pressure and heat applied during heat sealing.

Further, in package 10 with a valve device according to the first embodiment, the cross-sectional diameter of seal attachment portion 220 is smaller than the cross-sectional diameter of valve function portion 210, as described above. Therefore, compared to the case where the cross-sectional diameter of the seal mounting portion 220 is equal to or larger than the cross-sectional diameter of the valve function portion 210, the portion of the peripheral joint portion 130 where the seal mounting portion 220 is sandwiched between the valve device-equipped package body The difference between the length L4 in the thickness direction of , and the length L3 in the thickness direction of the package with the valve device in the portion of the peripheral joint portion 130 where the seal attachment portion 220 is not sandwiched is small. The larger the difference, the more the outer peripheral surface of the seal attachment portion 220 is fused with the heat-fusible resin layer 35, which is the innermost layer of the packaging materials 110 and 120, to create a state in which they are joined without gaps. The seal pressure must be increased. As a result, the pressure applied to the periphery of container 100 for heat sealing increases. If the pressure increases, the heat-sealable resin layer 35 may become thinner especially at the position where the seal attachment portion 220 is sandwiched, and further at the position where the tab film 310 and the tab 300 are sandwiched. If the heat-sealable resin layer 35 becomes thin, dielectric breakdown may occur in the package 10 with the valve device.

In package 10 with a valve device according to the first embodiment, as described above, the difference between length L4 and length L3 is small. Therefore, when the periphery of the container 100 is sandwiched by the heat sealing machine, pressure and heat are appropriately applied to the heat-fusible resin layer 35 over the entire periphery of the container 100 . As a result, according to the valve device-equipped package 10, the possibility of dielectric breakdown occurring in the valve device-equipped package 10 is reduced, and the facing heat-fusible resin layers 35 are appropriately fused, and the seal mounting portion is 220 can be firmly fixed to the container 100 .

Further, in the valve-device-equipped package 10 according to the first embodiment, the end portion of the seal attachment portion 220 in the direction of the arrow B protrudes further into the space S1 than the flange portion 114 . Therefore, there is a possibility that the end portion of the seal attachment portion 220 in the direction of the arrow B may come into contact with the content 400 depending on how the package 10 with a valve device is used. In package 10 with a valve device according to Embodiment 1, as described above, seal attachment portion 220 is rounded at the end in the direction of arrow B (FIG. 5). Therefore, even if the end of the seal attachment portion 220 comes into contact with the contents 400, the possibility of the end damaging the contents 400 is low. Also, depending on the usage of the package 10 with a valve device, the end portion of the seal attachment portion 220 in the direction of the arrow B may come into contact with the heat-sealable resin layer 35 of the packaging material 120 . In package 10 with a valve device according to Embodiment 1, as described above, the end of seal attachment portion 220 in the direction of arrow B is rounded. Even if the material 120 comes into contact with the heat-fusible resin layer 35 , the possibility that the edge of the material 120 will damage the heat-fusible resin layer 35 is low.

<1-5. Manufacturing method>
FIG. 9 is a flow chart showing the manufacturing procedure of the package 10 with a valve device. For example, the valve device-equipped package 10 is manufactured by a manufacturing apparatus.

Referring to FIG. 9, the manufacturing apparatus places each component in container 100 (step S100). For example, the manufacturing apparatus places the contents (electricity storage device element) 400 (electricity storage device element) to which the tab 300 with the tab film 310 is electrically connected by welding in the space S1 in the packaging material 110, thereby packaging the package. The tab 300 with the tab film 310 is placed on the flange portion 114 of the material 110 , and then the valve device 200 is placed on the flange portion 114 of the packaging material 110 . The content 400 (electricity storage device element) is placed in the space S1 in the packaging material 110, and then the tab 300 with the tab film 310 is welded to the content 400 (electricity storage device element) for electrical connection. At the same time, it is also possible to place the tab 300 with the tab film 310 on the flange portion 114 of the packaging material 110, and then place the valve device 200 on the flange portion 114 of the packaging material 110. be. The manufacturing apparatus then places the packaging material 120 on the packaging material 110 .

FIG. 10 illustrates the operation of placing the valve device 200 between the flange portion 114 of the packaging material 110 and the packaging material 120. FIG. As shown in FIG. 10, a step is formed between the valve function portion 210 and the seal mounting portion 220 . Therefore, even if the valve device 200 is pushed too far toward the container 100 when the seal attachment portion 220 is sandwiched between the packaging materials 110 and 120, the stepped portions are caught by the ends of the packaging materials 110 and 120. Therefore, according to the package 10 with a valve device, it is possible to prevent the valve function part 210 from being erroneously sandwiched between the packaging materials 110 and 120 (the heat-sealable resin layers 35) during the manufacturing process of the package 10 with a valve device. can do. 31, the tip of the seal attachment portion 220 of the valve device 200 may be arranged at a position sandwiched between the packaging materials 110, 120. As shown in FIG.

When the placement of each component is completed, the manufacturing apparatus heat seals the periphery of the container 100 (step S110). That is, the manufacturing apparatus pinches the periphery of the container 100 and applies pressure and heat to the periphery of the container 100 . As a result, the facing heat-fusible resin layers 35 are fused to each other at the periphery of the container 100 to form a peripheral joint 130 . Then, the content 400 is sealed in the container 100, the valve device 200 is fused and fixed to the peripheral joint 130, and the tab 300 is also fused to the peripheral joint 130 via the tab film 310. It is fixed and the package 10 with a valve device is completed. In the heat-sealing process, the interior of the container 100 is degassed so that the interior of the container 100 does not contain unnecessary gas. Specifically, without bonding the entire periphery, a part of the periphery is left unbonded, the unbonded periphery is degassed, and finally pressure and heat are applied to the unbonded periphery. In addition, the peripheral joint portion 130 of the entire circumference is completed, and furthermore, in the case of a package with a valve device that requires an electrolytic solution, the entire circumference is not joined, and a part of the package is left in an unjoined state. Leaving a peripheral edge, the electrolytic solution is injected from this unbonded peripheral edge, degassed, and finally pressure and heat are applied to the unbonded peripheral edge to complete the peripheral edge joint 130 of the entire circumference. There is also

It is also effective to shape the surfaces of the seal bars of the manufacturing apparatus that sandwich the periphery of the container 100 so as to conform to the outer shape of the seal mounting portion 220 . In this case, the adhesion between the heat-fusible resin layers 35 at the position where the seal attachment portion 220 is sandwiched becomes stronger. Even in this case, in order to reduce the deformation and load on packaging materials 110 and 120, it is effective to make the shape of seal mounting portion 220 flat as in Embodiment 2 described later.

<1-6. Features>
As described above, in package 10 with a valve device according to the first embodiment, at least part of seal attachment portion 220 of valve device 200 is sandwiched between heat-fusible resin layers 35 at peripheral joint portion 130. , the valve function portion 210 of the valve device 200 is not sandwiched between the heat-sealable resin layers 35 at the peripheral joint portion 130 . Therefore, in the package 10 with a valve device, greater pressure and heat are not applied to the valve function portion 210 than to the seal attachment portion 220 when the opposing heat-fusible resin layers 35 are fused. As a result, according to the packaging body 10 with a valve device, failure of the valve mechanism in the valve function part 210 due to the pressure and heat applied when the opposing heat-sealable resin layers 35 are fused can be suppressed. .

Note that the content 400 is an example of the "package element with a valve device" of the present disclosure, the container 100 is an example of the "container" of the present disclosure, and the valve device 200 is an example of the "valve element" of the present disclosure. It is an example of "device". The base layer 31 is an example of the “base layer” of the present disclosure, the barrier layer 33 is an example of the “barrier layer” of the present disclosure, and the heat-fusible resin layer 35 is the “thermal layer” of the present disclosure. It is an example of the "fusible resin layer". Peripheral joint 130 is an example of a "peripheral joint" in the present disclosure. The valve function part 210 is an example of the "first part" of the present disclosure, and the seal attachment part 220 is an example of the "second part" of the present disclosure. The ventilation path A1 is an example of the "ventilation path" of the present disclosure.

In addition, in order to facilitate understanding that the contents 400 are housed in the space S1 within the container 100, the contents 400 are illustrated in a smaller size than the space S1 of the container 100 for convenience. However, since the contents 400 are placed in the space S1 in the manufacturing process, the space S1 is slightly larger than the contents 400, but since the air is removed in the manufacturing process as described above, the final package with a valve device is In the state of 10, the space S1 is slightly shrunk due to the degassing and becomes substantially the same size as the content 400, and the content 400 is accommodated in the space S1 with almost no gap.

[2. Embodiment 2]
Embodiment 2 differs from Embodiment 1 in the configuration of the valve device. Other configurations are basically the same as those of the first embodiment. Here, portions different from the first embodiment will be described.

FIG. 11 is a plan view of a valve device 200A mounted on a package with a valve device according to the second embodiment. As shown in FIG. 11, the valve device 200A includes a valve function portion 210A and a seal mounting portion 220A. At least a portion of the seal attachment portion 220A is sandwiched between the packaging materials 110 and 120 and heat-sealed. The seal attachment portion 220A has a different cross-sectional shape compared to that of the first embodiment. The valve function portion 210A is basically the same as that of the first embodiment, but the housing and the valve mechanism may differ depending on the shape of the air passage A6 (FIG. 12) formed in the seal attachment portion 220A. has been partially modified.

12 is a cross-sectional view taken along line XII-XII of FIG. 11. FIG. As shown in FIG. 12, in the cross section of the seal attachment portion 220A, the length L5 of the valve device-equipped package in the width direction (arrow LR direction) is the length of the valve device-equipped package in the thickness direction (arrow UD direction). longer than L6. More specifically, the cross-sectional shape of the seal attachment portion 220A is elliptical.

An air passage A6 is formed inside the seal attachment portion 220A. In the air passage A6, the length in the width direction of the package with the valve device is longer than the length in the thickness direction of the package with the valve device. More specifically, the cross-sectional shape of the air passage A6 is elliptical.

Thus, in the second embodiment, in the cross section of the seal attachment portion 220A, the length L5 in the width direction of the package with the valve device is longer than the length L6 in the thickness direction of the package with the valve device. That is, the length of the seal attachment portion 220A in the thickness direction of the package with the valve device is shorter than when the cross-sectional shape of the seal attachment portion is a perfect circle (with the same area). In this valve device-equipped package, the length in the thickness direction of the portion of the peripheral joint portion 130 where the seal attachment portion 220A is sandwiched between the valve device-equipped package body and the seal attachment portion 220A of the peripheral edge joint portion 130 are sandwiched. The difference from the length in the thickness direction of the valve device-equipped package at the portion not covered with the valve device is smaller. Therefore, according to this package with a valve device, pressure and heat can be appropriately applied to the heat-fusible resin layer 35 over the entire peripheral edge of the container 100, and the opposing heat-fusible resin layer 35 can be properly heated. Since it can be fused, the seal mounting portion 220A of the valve device 200A can be firmly fixed to the container 100. FIG.

The valve device 200A is an example of the “valve device” of the present disclosure, the valve function portion 210A is an example of the “first portion” of the present disclosure, and the seal mounting portion 220A is the “second portion” of the present disclosure. It is an example of "part". The ventilation path A6 is an example of the "ventilation path" of the present disclosure.

[3. Embodiment 3]
Embodiment 3 differs from Embodiment 1 in the configuration of the valve device. Other configurations are basically the same as those of the first embodiment. Here, portions different from the first embodiment will be described.

FIG. 13 is a plan view of a valve device 200B mounted on a package with a valve device according to the third embodiment. As shown in FIG. 13, the valve device 200B includes a valve function portion 210B and a seal mounting portion 220B. At least a portion of the seal attachment portion 220B is a portion sandwiched between the packaging materials 110 and 120 and heat-sealed. The seal attachment portion 220B has a different cross-sectional shape compared to that of the first embodiment. The valve function portion 210B is basically the same as that of the first embodiment, but the housing and the valve mechanism may differ depending on the shape of the air passage A7 (FIG. 14) formed in the seal attachment portion 220B. has been partially modified.

14 is a cross-sectional view taken along line XIV-XIV of FIG. 13. FIG. As shown in FIG. 14, in the seal attachment portion 220B, wing-shaped extension portions 40 and 41 are formed at both end portions in the width direction (arrow LR direction) of the package with the valve device. Each of the wing-shaped extended ends 40 and 41 has a shape that becomes thinner as it approaches the end in the width direction of the package with the valve device. Also, from another point of view, each of the wing-shaped extensions 40 and 41 is larger than the other portion (circular portion) of the seal attachment portion 220B in the direction of the arrow LR in the thickness direction of the package with the valve device. It can also be said that the change in length is gradual.

In the valve device-equipped package according to the third embodiment, as compared with the first embodiment (when the seal attachment portion 220B is not provided with the wing-shaped extended ends 40 and 41), the peripheral joint portion 130 has less seals. The change in the thickness direction of the package with the valve device is smooth at the position where the portion where the attachment portion 220B is not sandwiched to the portion of the peripheral joint portion 130 where the seal attachment portion 220B is sandwiched. Therefore, according to this package with a valve device, the position where the seal attachment portion 220B is sandwiched between the heat-fusible resin layers 35 and the position where the seal-attachment portion 220B is not sandwiched between the heat-fusible resin layers 35 are different. Since no undue force is applied to the packaging materials 110 and 120 at the boundary between the two, the seal attachment portion 220B of the valve device 200B can be firmly fixed to the container 100. FIG.

The valve device 200B is an example of the “valve device” of the present disclosure, the valve function portion 210B is an example of the “first portion” of the present disclosure, and the seal mounting portion 220B is the “second portion” of the present disclosure. It is an example of "part". The wing-shaped extensions 40 and 41 are examples of the "wing-shaped extensions" of the present disclosure. The ventilation path A7 is an example of the "ventilation path" of the present disclosure.

[4. Embodiment 4]
Embodiment 4 differs from Embodiment 1 in the configuration of the valve device. Other configurations are basically the same as those of the first embodiment. Here, portions different from the first embodiment will be described.

FIG. 15 is a plan view of a valve device 200C mounted on a package with a valve device according to the fourth embodiment. As shown in FIG. 15, the valve device 200C includes a valve function portion 210C and a seal mounting portion 220C. At least a portion of the seal attachment portion 220C is sandwiched between the packaging materials 110 and 120 and heat-sealed. 220 C of seal|sticker attachment parts differ in cross-sectional shape compared with Embodiment 1. As shown in FIG. The valve function portion 210C is basically the same as that of the first embodiment, but the housing and the valve mechanism may differ depending on the shape of the air passage A2 (FIG. 16) formed in the seal attachment portion 220C. has been partially modified.

16 is a cross-sectional view taken along line XVI-XVI of FIG. 15. FIG. As shown in FIG. 16, pillars 50 and 51 are formed inside the seal attachment portion 220C (inside the air passage A2). Each of the pillars 50 and 51 extends in the thickness direction of the package with the valve device (in the direction of the arrow UD), and both ends in the thickness direction of the package with the valve device are connected to the inner periphery of the seal attachment portion 220C. Also, each of the pillars 50 and 51 extends in the direction of the arrow FB within the air passage A2 (FIG. 15). Note that the number of pillars does not necessarily have to be two, and at least one is sufficient.

In the valve device-equipped package according to the fourth embodiment, since the pillars 50 and 51 are formed in the air passage A2, the pressure and Even with the application of heat, the airway A2 is maintained. Therefore, according to this valve device-equipped package, it is possible to suppress breakage of the air passage A2 in the seal attachment portion 220C when the opposing heat-fusible resin layers 35 are fused.

The valve device 200C is an example of the “valve device” of the present disclosure, the valve function portion 210C is an example of the “first portion” of the present disclosure, and the seal mounting portion 220C is the “second portion” of the present disclosure. It is an example of "part". Pillars 50 and 51 are examples of "pillars" in the present disclosure. The ventilation path A2 is an example of the "ventilation path" of the present disclosure.

[5. Embodiment 5]
The fifth embodiment differs from the first embodiment in the configuration of the valve device. Other configurations are basically the same as those of the first embodiment. Here, portions different from the first embodiment will be described.

FIG. 17 is a plan view of a valve device 200D mounted on a package with a valve device according to the fifth embodiment. As shown in FIG. 17, the valve device 200D includes a valve function portion 210 and a seal mounting portion 220D. The configuration of valve function unit 210 is the same as in the first embodiment.

At least a portion of the seal attachment portion 220D is a portion sandwiched between the packaging materials 110 and 120 and heat-sealed. The outer surface of seal attachment portion 220D is different from that of the first embodiment. Specifically, the outer surface of the seal attachment portion 220D is a pear-finished surface. The surface roughness Ra of the pear ground is, for example, 1 μm to 20 μm.

In the valve device-equipped package according to the fifth embodiment, since the outer surface of the seal attachment portion 220D is not smooth, the heat-sealable resin is likely to melt at the position in contact with the seal attachment portion 220D. Therefore, according to this valve device-equipped package, the seal attachment portion 220D of the valve device 200D is more firmly fixed to the container 100 than in Embodiment 1 (where the outer surface of the seal attachment portion 220D is smooth). can do.

The valve device 200D is an example of the "valve device" of the present disclosure, and the seal mounting portion 220D is an example of the "second portion" of the present disclosure.

[6. Embodiment 6]
Embodiment 6 differs from Embodiment 1 in the configuration of the valve device. Other configurations are basically the same as those of the first embodiment. Here, portions different from the first embodiment will be described.

FIG. 18 is a plan view of a valve device 200E mounted on a package with a valve device according to the sixth embodiment. As shown in FIG. 18, the valve device 200E includes a valve function portion 210 and a seal mounting portion 220E. The configuration of valve function unit 210 is the same as in the first embodiment.

At least a portion of the seal attachment portion 220E is sandwiched between the packaging materials 110 and 120 and heat-sealed. The outer surface of the seal attachment portion 220E is different from that of the first embodiment. Specifically, the outer surface of the seal attachment portion 220E is formed with a protruding portion 60 extending continuously in the circumferential direction. Three ridges 60 are formed in the direction of the arrow FB in the seal mounting portion 220E. It should be noted that the number of ridges 60 does not necessarily have to be three, and at least one should be formed.

19 is a cross-sectional view taken along line XIX-XIX of FIG. 18. FIG. As shown in FIG. 19, the cross section of the protruding portion 60 is semicircular. The semicircular R is, for example, 0.05 mm to 1.0 mm. The diameter L12 (the length in the thickness direction of the package with the valve device, the length in the width direction of the package with the valve device) at the portion of the seal attachment portion 220E where the ridge portion 60 is formed is equal to the length of the ridge portion. 60 is longer than the diameter L11 where it is not formed.

During heat-sealing, the ridges 60 reliably contact the heat-sealable resin layer 35 , and thus are easily fused to the packaging materials 110 and 120 . In the valve device-equipped package according to the sixth embodiment, the ridge portion 60 extends continuously around the outer surface of the seal attachment portion 220E in the circumferential direction. Therefore, according to this valve device-equipped package, the heat-fusible resin layer 35 and the seal attachment portion 220E can be fused together along one circumference of the seal attachment portion 220E in the circumferential direction. In addition, in this package with a valve device, the outer surface of the seal attachment portion 220E and the heat-sealable resin are different from the first embodiment (when the seal attachment portion 220E is not formed with the ridge portion 60). Since the contact area with is large, the seal mounting portion 220E of the valve device 200E can be firmly fixed to the packaging material 110. As shown in FIG.

The valve device 200E is an example of the "valve device" of the present disclosure, and the seal mounting portion 220E is an example of the "second portion" of the present disclosure. The ridge portion 60 is an example of the “ridge portion” of the present disclosure. The ventilation path A3 is an example of the "ventilation path" of the present disclosure.

In addition, in the sixth embodiment, the protruding streak portion 60 extends continuously around the circumferential direction. It does not have to be continuous. For example, when the wing-like extensions 40 and 41 are provided as in the above-described third embodiment, there is no need to provide the protruding streak 60 that encircles the wing-like extensions 40 and 41. The tip portions of the end portions 40 and 41 may not be provided with the ridge portion 60, or the wing-like extension portions 40 and 41 may not be provided with the ridge portion 60. It is also possible to form it intermittently.

[7. Embodiment 7]
The seventh embodiment differs from the first embodiment in the configuration of the valve device. Other configurations are basically the same as those of the first embodiment. Here, portions different from the first embodiment will be described.

FIG. 20 is a plan view of a valve device 200F mounted on a package with a valve device according to the seventh embodiment. As shown in FIG. 20, the valve device 200F includes a valve function portion 210F and a seal mounting portion 220F. At least a portion of the seal attachment portion 220F is sandwiched between the packaging materials 110 and 120 and heat-sealed. The valve function portion 210F and the seal attachment portion 220F have different cross-sectional shapes compared to those of the first embodiment.

21 is a cross-sectional view taken along line XXI-XXI of FIG. 20. FIG. As shown in FIG. 21, the cross section of the valve function portion 210F is semicircular. That is, the surface of the valve function portion 210F in the direction of the arrow U is flat. In addition, the cross section of the seal mounting portion 220F has wing-shaped extended ends 40F and 41F at both ends in the direction of the arrow LR. The surface of the seal attachment portion 220F in the direction of arrow U is flat. The surface of the valve function portion 210F in the direction of arrow U and the surface of the seal attachment portion 220F in the direction of arrow U are flush with each other.

Therefore, when the valve device 200F is arranged with the surface in the direction of the arrow U facing down, the valve device 200F does not roll. Therefore, according to the valve device-equipped package according to the seventh embodiment, since the valve device 200F does not roll when the valve device 200F is attached to the container 100, the valve device 200F can be easily positioned.

FIG. 22 is a diagram showing how the valve device 200F is attached to the container 100. FIG. As shown in FIG. 22, when the valve device 200F is attached to the container 100, the flat surface of the valve device 200F rests on the surface of the innermost layer of the packaging material 120. As shown in FIG. In this state, the valve device 200F does not roll. Therefore, according to the package with a valve device according to the seventh embodiment, when the valve device 200F is attached to the container 100, the positioning of the valve device 200F can be easily performed. In addition, in the state where the package with the valve device is used, the bulging of the peripheral joint portion 130 due to the valve device 200F can be directed in the direction in which the container 100 bulges, that is, in FIG.

In addition, the valve device 200F is an example of the “valve device” of the present disclosure, the valve function portion 210F is an example of the “first portion” of the present disclosure, and the seal attachment portion 220F is an example of the “second portion” of the present disclosure. It is an example of "part". The ventilation path A4 is an example of the "ventilation path" of the present disclosure.

[8. Modification]
Although Embodiments 1 to 7 have been described above, the present disclosure is not limited to Embodiments 1 to 7 above, and various modifications can be made without departing from the gist thereof. Modifications will be described below. However, the following modified examples can be combined as appropriate.

<8-1>
In Embodiments 1 to 7, the cross section of the seal mounting portion (seal mounting portion 220, etc.) has a shape based on a circular shape. However, the cross-sectional shape of the seal attachment portion is not limited to this. For example, the cross-sectional shape of the seal mounting portion may have a shape based on a polygon.

FIG. 23 is a diagram showing a cross section of a valve device 200G in Modification 1. As shown in FIG. As shown in FIG. 23, in the valve device 200G, the cross section of the seal mounting portion 220G has a diamond shape. In the seal attachment portion 220G, the length L7 in the width direction of the package with the valve device is longer than the length L8 in the thickness direction of the package with the valve device. In this valve device-equipped package, the length in the thickness direction of the portion of the peripheral joint portion 130 where the seal attachment portion 220G is sandwiched between the valve device-equipped package body and the seal attachment portion 220G of the peripheral joint portion 130 are sandwiched. The difference from the length in the thickness direction of the valve device-equipped package at the portion not covered with the valve device is smaller. Therefore, according to this package with a valve device, pressure and heat can be appropriately applied to the heat-fusible resin layer 35 over the entire peripheral edge of the container 100, and the opposing heat-fusible resin layer 35 can be properly heated. Since it can be fused, the seal attachment portion 220G of the valve device 200G can be firmly fixed to the housing body 100 .

FIG. 24 is a diagram showing a cross section of a valve device 200H in Modification 2. As shown in FIG. As shown in FIG. 24, in the valve device 200H, the cross section of the seal attachment portion 220H has a chamfered rhombus or hexagonal shape at both ends in the thickness direction of the package with the valve device. In the seal attachment portion 220H, the length L9 in the width direction of the package with the valve device is longer than the length L10 in the thickness direction of the package with the valve device. In this valve device-equipped package, the length in the thickness direction of the portion of the peripheral joint portion 130 where the seal attachment portion 220H is sandwiched between the valve device-equipped package body and the seal attachment portion 220H of the peripheral joint portion 130 are sandwiched. The difference from the length in the thickness direction of the valve device-equipped package at the portion not covered with the valve device is smaller. Therefore, according to this package with a valve device, pressure and heat can be appropriately applied to the heat-fusible resin layer 35 over the entire peripheral edge of the container 100, and the opposing heat-fusible resin layer 35 can be properly heated. Since it can be fused, the seal mounting portion 220H of the valve device 200H can be firmly fixed to the housing body 100 .

FIG. 25 is a diagram showing a cross section of a valve device 200I in Modification 3. As shown in FIG. As shown in FIG. 25, in the valve device 200I, the cross section of the seal attachment portion 220I has a rhombic shape with wing-shaped extended ends 40I and 41I provided at both ends (in the width direction of the package with the valve device). have. In this valve device-equipped package, compared with, for example, Embodiment 1 (when the seal attachment portion 220I is not provided with the wing-shaped extended ends 40I and 41I), the seal attachment portion 220I of the peripheral joint portion 130 is The change in the thickness direction of the valve device-equipped package is smooth at the position where the seal attachment portion 220I is sandwiched in the peripheral joint portion 130 from the portion not sandwiched. Therefore, according to this package with a valve device, the position where the seal attachment portion 220I is sandwiched between the heat-fusible resin layers 35 and the position where the seal-attachment portion 220I is not sandwiched between the heat-fusible resin layers 35 are different. Since no undue force is applied to the packaging materials 110 and 120 at the boundary between the two, the seal mounting portion 220I of the valve device 200I can be firmly fixed to the container 100. FIG.

26 is a plan view of a valve device 200J in Modification 4. FIG. As shown in FIG. 26, the valve device 200J includes a valve function portion 210J and a seal mounting portion 220J. A ventilation path A5 is formed in the seal attachment portion 220J.

27 is a cross-sectional view taken along line XXVII-XXVII of FIG. 26. FIG. This cross section can also be said to be a plane normal to the center line C1 of the air passage A5. As shown in FIG. 27, in the valve device 200J, the cross section of the seal mounting portion 220J has a hexagonal (polygonal) shape. Each corner of the hexagon is formed with an R (for example, R=0.2 mm to 2.0 mm). According to this valve device-equipped package, for example, the possibility that the portion of the seal attachment portion 220J located inside the container 100 will damage the contents 400 inside the container 100 can be reduced, and the seal is attached. It is possible to reduce the possibility that the portion sandwiched between the heat-fusible resin layers 35 in the portion 220J will damage the heat-fusible resin layer 35 and reduce the insulation properties of the heat-fusible resin layer 35 .

<8-2>
In Embodiments 1 to 7 above, the flange portion 114 of the packaging material 110 was in a flat state. However, the shape of the flange portion 114 is not limited to this. For example, the flange portion 114 may be formed with a valve device placement portion for arranging the seal mounting portion 220 of the valve device 200 in advance.

28 is a plan view of a packaging material 110K in modification 5. FIG. As shown in FIG. 28, a valve device placement portion 116K is formed on the flange portion 114K.

29 is a cross-sectional view taken along line XXIX-XXIX of FIG. 28. FIG. As shown in FIG. 29, the valve device placement portion 116K formed on the flange portion 114K has a semicircular shape. The diameter of this semicircle is, for example, slightly longer than the diameter of seal mount 220 . With the seal mounting portion 220, for example, placed in the valve device placement portion 116K, the peripheral edge of the container is heat-sealed. As a result, deformation of the packaging material during heat sealing is suppressed, and the possibility of pinholes or breakage occurring near the seal mounting portion 220 can be reduced. It should be noted that the valve device arrangement portion 116K does not necessarily have to be provided on the packaging material 110K, and may be provided on the packaging material 120. FIG. Even in this case, it is possible to obtain the same effect as when the valve device arrangement portion 116K is provided in the packaging material 110K.

<8-3>
In Embodiments 1 to 7 above, only a portion of the seal attachment portion (for example, seal attachment portion 220 ) is sandwiched between heat-sealable resin layers 35 at peripheral joint portion 130 . However, the mounting state of the seal mounting portion is not limited to this. For example, the entire seal attachment portion may be sandwiched between the heat-sealable resin layers 35 at the peripheral joint portion 130 . Even in such a case, the corner of the end of the seal attachment portion (eg, seal attachment portion 220) opposite to the valve function portion (eg, valve function portion 210) in plan view is rounded. Therefore, there is a low possibility that the edge damages the heat-fusible resin layer 35 and deteriorates the insulating properties of the heat-fusible resin layer 35 .

<8-4>
In the first to seventh embodiments described above, in the valve device (eg, valve device 200), there is a step at the boundary between the valve function portion (eg, valve function portion 210) and the seal attachment portion (eg, seal attachment portion 220). was formed. However, a step need not necessarily be formed at the boundary between the valve function portion and the seal mounting portion. For example, the cross-sectional diameter of the valve functioning portion and the cross-sectional diameter of the seal mounting portion may be the same, and the valve functioning portion and the seal mounting portion may be connected in a flat manner.

<8-5>
In Embodiments 1 to 7 above, the cross section of the air passage (for example, air passage A1) formed in the seal attachment portion (seal attachment portion 220, etc.) has a shape based on a circle. However, the cross-sectional shape of the air passage is not limited to this. For example, the cross-sectional shape of the air passage may be a shape based on a polygon.

<8-6>
In Embodiments 1 to 7 above, the corner of the seal mounting portion (eg, seal mounting portion 220) opposite to the valve functioning portion (eg, valve functioning portion 210) is rounded. However, the corners do not necessarily have to be rounded.

<8-7>
In Embodiments 1 to 7 above, the valve device (for example, the valve device 200) was a so-called check valve. However, the valve device need not necessarily be a check valve. The valve device may be, for example, a so-called break valve or a selectively permeable valve.

<8-8>
Referring again to FIG. 1, in Embodiments 1 to 7 above, tabs 300 are provided at both ends of container 100 in the direction of arrow LR, and a valve device (for example, valve device 200) is attached to container 100 in the direction of arrow LR. It was provided at the end in the F direction. However, the positional relationship between the valve device 200 and the tab 300 is not limited to this. For example, both tabs 300 may be positioned on the same side of the perimeter of container 100 and the valve device may be positioned between the two tabs 300 , or both tabs 300 may be positioned on the same side of the perimeter of container 100 . The valve device may be arranged on any one of the three sides other than the side on which the tab 300 is arranged.

<8-9>
In Embodiments 1 to 7 above, container 100 includes packaging material 110 formed by embossing or the like, and packaging material 120 separate from packaging material 110 . However, the container 100 does not necessarily have to have such a configuration.

For example, the packaging material 110 and the packaging material 120 may be previously integrated (connected) along one side. In this case, the packaging material 110 and the packaging material 120 are integrated (connected) at the end of the flange portion 114 of the packaging material 110, and the packaging material 110 and the packaging material 120 are stacked together. The contents 400 may be hermetically sealed within the container 100 by four-sided sealing. In addition, the flange portion 114 is omitted on the side where the packaging material 110 and the packaging material 120 are integrated, and the container 100 Contents 400 may be sealed within.

Also, for example, the packaging material 120 may be molded into the same shape as the packaging material 110 . Further, the container 100 may be, for example, a pouch-type container. The pouch-type container may be of any type such as a three-side seal type, a four-side seal type, a pillow type, and a gusset type.

<8-10>
In Embodiments 1 to 7 above, the housing of the valve function portion (eg, valve function portion 210) and the housing of the seal attachment portion (eg, seal attachment portion 220) are made of the same material (resin). rice field. However, the housing of the valve function portion and the housing of the seal attachment portion do not necessarily have to be made of the same material. For example, the housing of the valve function part and the housing of the seal attachment part may be made of different materials, and the melting point of the material of the valve function part may be higher than the melting point of the material of the seal attachment part. For example, the seal mounting part is made of polypropylene (PP), and the valve function part is made of resin with a higher melting point than PP (for example, fluorine resin, polyester resin, polyimide resin, polycarbonate resin, acrylic resin) or metal. may be Polypropylene (PP), which is easily integrated with the inner layer of the packaging material, is preferable as the resin used for the seal attachment portion.

In this valve device-equipped package, even if pressure and heat are applied to the seal attachment portion when the facing heat-fusible resin layers 35 are fused, the melting point of the material of the valve function portion will be lower than that of the material of the seal attachment portion. Since it is higher than the melting point, there is little possibility that the valve function part will be deformed by heat. Therefore, according to this valve device-equipped package, it is possible to suppress failure of the valve mechanism in the valve function portion when the opposing heat-sealable resin layers 35 are fused.

<8-11>
In Embodiments 1 to 7 above, the housing of the valve device 200 is made of resin, and the seal attachment portion 220 is directly sandwiched between the heat-sealable resin layers 35 . However, the housing of the valve device 200 does not necessarily have to be made of resin, and may be made of metal (for example, aluminum or stainless steel). In this case, an adhesive protective film may be placed between the seal attachment portion 220 and the heat-sealable resin layer 35 . One surface of the adhesive protective film is configured to adhere to at least resin, and the other surface is configured to adhere to at least metal. Various known adhesive protective films can be employed as the adhesive protective film, and for example, the same adhesive protective film as the tab film 310 can be used.

<8-12>
In Embodiments 1 to 7 above, the outer peripheral side of the seal mounting portion (eg, seal mounting portion 220) (the corner of the end opposite to the valve functioning portion (eg, valve functioning portion 210) side of the seal mounting portion) However, the inner peripheral side of the seal mounting portion (the edge of the air passage (for example, the air passage A1)) was not formed with the R. However, the radius may be formed on the inner peripheral side of the seal mounting portion. By forming an R on the inner peripheral side of the seal mounting portion, the possibility that the corners of the inner peripheral side of the seal mounting portion are scraped and dust (for example, resin, metal, etc.) falls into the container 100 is reduced. be able to.

<8-13>
Referring to FIG. 21 again, in the seventh embodiment, the outer surfaces of both the valve function portion 210F and the seal attachment portion 220F are flat. However, it is not necessary that the outer surfaces of both the valve function portion 210F and the seal mounting portion 220F are flat. At least one of the outer surface of the valve function portion 210F and the seal attachment portion 220F may be flat.

<8-14>
In addition, although the packaging body 10 with a valve device of Embodiments 1 to 7 is a secondary battery that is an electricity storage device, it is defined by the concept of outputting electricity. Packages with valve devices such as double layer capacitors (EDLC) and lithium ion capacitors are also included, and the types of secondary batteries are not particularly limited, for example, lithium ion batteries, lithium ion polymer batteries, lead Storage batteries, nickel-hydrogen batteries, nickel-cadmium batteries, nickel-iron storage storage devices, nickel-zinc storage batteries, silver-zinc oxide storage batteries, metal-air batteries, polyvalent cation batteries, all-solid batteries, and the like.

EXAMPLES The present disclosure will be described in detail below with reference to examples and comparative examples. However, the present disclosure is not limited to the examples.

[Example 1 and Comparative Examples 1 and 2]
<Production of packaging material>
Polyethylene terephthalate film (12 μm)/adhesive layer (2-liquid curing type urethane adhesive (polyol compound and aromatic isocyanate compound), thickness 3 μm)/biaxially oriented nylon film (thickness 15 μm) are laminated in this order as a base layer. A laminated film was prepared. Next, an aluminum foil (JIS H4160: 1994 A8021H-O, thickness 40 μm, average crystal grain size 4.0 μm, thickness 40 μm) having an acid-resistant film formed on both sides was placed on a biaxially stretched nylon film (thickness 15 μm) as a substrate layer. 2 μm) was laminated by a dry lamination method. Specifically, on one side of an aluminum foil having an acid-resistant film (a film formed by chromate treatment, with a chromium content of 30 mg/m ² ) formed on both sides, a two-component curable urethane adhesive (a polyol compound and aromatic isocyanate compound) was applied to form an adhesive layer (thickness 3 μm after curing) on the aluminum foil. Next, after laminating the adhesive layer on the aluminum foil and the polyethylene terephthalate film, aging treatment was performed to prepare a laminate of base material layer/adhesive layer/barrier layer. Next, a maleic anhydride-modified polypropylene (40 μm thick) as an adhesive layer and a polypropylene (40 μm thick) as a heat-fusible resin layer are co-extruded on the barrier layer of the resulting laminate. Thus, the adhesive layer/heat-fusible resin layer was laminated on the barrier layer. Next, by aging and heating the obtained laminate, polyethylene terephthalate film (12 μm)/adhesive layer (3 μm)/biaxially oriented nylon film (15 μm)//adhesive layer (3 μm)/barrier layer (40 μm)/adhesive layer (40 μm)/heat-fusible resin layer (40 μm) laminated in this order to obtain a packaging material.

<Preparation of package sample with valve device>
The resulting packaging material was cut into strips of length (MD) 120 mm×width (TD) 110 mm. The MD of the packaging material corresponds to the rolling direction (RD) of the aluminum alloy foil, and the TD of the packaging material corresponds to the TD of the aluminum alloy foil. One strip was cold-formed so that the heat-fusible resin layer side was recessed to form a molded part of length (MD) 110 mm, width (TD) 100 mm, and depth 5 mm. Specifically, in an environment of 25 ° C., this strip is placed in a rectangular mold (female mold, surface is JIS B 0659- 1:2002 Annex 1 (Reference) The maximum height roughness (Rz nominal value) specified in Table 2 of the surface roughness standard piece for comparison is 3.2 μm.Corner R 2.0 mm, ridge R 1.0 mm ) and the corresponding molding die (male mold, surface is JIS B 0659-1: 2002 Annex 1 (reference) Maximum height roughness specified in Table 2 of the standard piece for comparison (Nominal value of Rz) is 1.6 μm.Using corner R 2.0 mm, ridge R 1.0 mm), pressing pressure (surface pressure) 0.25 MPa, forming depth 5 mm cold forming (pull-in one-step forming) did At this time, the test strip was placed on the female mold so that the heat-fusible resin layer side was positioned on the male mold side. Next, the heat-fusible resin layer side of another strip was overlaid on the molded portion, and the heat-fusible resin layers facing each other at the periphery were heat-fused to seal the molded portion. . At this time, two pairs of tabs 300 and tab films 310 and a valve device 200 are interposed between the heat-fusible resin layers facing each other at the peripheral edges, as shown in FIG. A sample of a package with a valve device was produced by forming a peripheral joint portion. The positive electrode tab is an aluminum foil, and the negative electrode tab is a CuNi plated tab, each having a thickness of 0.1 mm, a length of 30 mm, and a width of 30 mm, and subjected to the same chromate treatment as the barrier layer. Also, the tab film is a maleic anhydride-modified polypropylene film (thickness: 100 μm). The heat-sealing conditions were a surface pressure of 1.0 MPa, a temperature of 190° C., a sealing time of 30 seconds, and a sealing width of 4 mm. The valve device had a surface pressure of 0.5 MPa, a temperature of 200° C., a sealing time of 5 seconds, and a sealing width of 4 mm.

In addition, as a seal bar used for heat-sealing the peripheral edge where the tab 300 is located, a notch (200 μm) is provided at the location where the tab 300 is located, so that the heat-sealing resin located above the tab 300 Large crushing of the layer is suppressed. Similarly, for the seal bar used for heat-sealing the periphery where the valve device 200 is located, the shape of the portion where the seal attachment portion 220 of the valve device 200 is located is processed so as to follow the shape of the seal attachment portion 220. This prevents the heat-fusible resin layer located on the seal attachment portion 220 from being greatly crushed.

The valve device 200 has the size and appearance shown in FIG. 30, the valve mechanism is a ball spring type, and the operating pressure is adjusted by a spring. The seal attachment portion 220 (length 5.0 mm, outer diameter φ2.5 mm of curved surface portion 220a, inner diameter φ1.2 mm of vent) is polypropylene resin, valve function portion 210 (length 13.0 mm, outer diameter φ6.0 mm) is made of stainless steel (SUS304). The differential pressure (opening pressure) between the primary side and the secondary side where the valve device is opened is the differential pressure between the primary side and the secondary side where the valve device of the container is opened ( The opening pressure, 25° C. environment) was set to 0.1 MPa for Example 1, 0.65 MPa for Comparative Example 1, and 0.8 MPa for Comparative Example 2.

<Confirmation of internal pressure of broken bag>
The valve function was removed from the valve device of the package sample with the valve device thus obtained, and the valve device was used as a test sample as an air passage. Stainless steel plates (thickness: 10 mm) were placed above and below the test sample with an interval of 5 mm. Next, place it in an environment of 80 ° C., send air into the inside of the package from the ventilation path, inflate the package by increasing the internal pressure by 0.01 MPa until the package is broken, and the internal pressure of the broken bag is The internal pressure at which the bag was torn was taken as As a result, the bag breaking internal pressure was 0.8 MPa.

<Open test>
At the time of manufacturing each sample of the package with the valve device, another valve device (however, the valve function was removed and ventilation A test sample for an open test was prepared in the same manner as each sample, except that a channel was attached. The obtained test sample was inserted into a frame in which stainless steel plates (thickness: 10 mm) were fixed at intervals of 5 mm to simulate the use environment. Next, in an environment of 25°C, air is sent in from the valve device used as the ventilation path to increase the internal pressure, and the appearance of the container after the gas is released from the valve device, and the container measured by the following method The maximum strain X of was confirmed. Table 1 shows the results. Whether or not the stainless steel plate is used can be appropriately selected according to the expected use environment. For example, when the package is installed in the space of the product housing, the distance between the stainless steel plates may be set to 5 mm or more, or the package may be installed in the actual housing and tested. Also, if it is expected to be used in a space where there are no obstacles around, there is no need to use a stainless steel plate.

<Measurement of maximum strain X>
The maximum strain X of the container was measured as follows. First, two identical packages whose maximum strain X was to be measured were prepared. Next, lines were drawn in a grid pattern at intervals of 1 mm on the outer surface of each package (that is, the outer surface of the container). At this time, the positions of the lines drawn on the outer surfaces of the two packages were the same. Next, for one of the packaging bodies, the valve function was removed from the valve device to form an air passage, and the test sample was placed in a frame in which stainless steel plates (thickness 10 mm) simulating the usage environment were fixed at intervals of 5 mm. After inserting, air was sent into the inside of the package through the air passage to raise the internal pressure to 1 MPa to inflate the package. Next, the air was removed from the air passage to normal pressure, and the package was cut along the grid lines to measure the thickness of the cross section. The package to which no air was introduced was also cut along the grid-like lines, and the thickness of the cross section was measured. Next, based on the thickness at the same position of the package to which air was not sent, the portion where the thickness was the thinnest was the maximum strain point, and the reduction rate (%) of the thickness at the maximum strain point was the maximum strain X ( %). Whether or not the stainless steel plate is used can be appropriately selected according to the envisaged usage environment. For example, when the package is installed in the space of the product housing, the distance between the stainless steel plates may be set to 5 mm or more, or the package may be installed in the actual housing and tested. Also, if it is expected to be used in a space where there are no obstacles around, there is no need to use a stainless steel plate.

As is clear from the results shown in Table 1, the maximum strain X of the container after the pressure inside the container rises and the gas inside the container is released from the valve device to the outside is set to less than 30%. In Example 1 described above, when the internal pressure rises due to the gas generated inside the package with the valve device, large wrinkles are formed in the container (that is, the exterior material) after the gas is released, or the shape is deformed. It can be seen that the gas is released from the valve device to the outside at an appropriate timing before the shape of the deformed portion changes significantly.

That is, the present disclosure provides inventions in the following aspects.
Section 1. a container configured by a laminate having at least a substrate layer, a barrier layer, and a heat-fusible resin layer in this order, and containing a content therein;
a valve device that communicates with the inside of the container,
The valve device is configured to reduce the pressure when the pressure inside the container rises due to the gas generated inside the container,
A package with a valve device, wherein the maximum strain in the thickness direction of the container after the pressure inside the container rises and the gas inside the container is released from the valve device to the outside is less than 30%. body.
Section 2. Item 2. The valve device according to item 1, wherein the valve device is set so that the valve device is opened when the differential pressure between the primary side and the secondary side of the valve device is within a range of 0.015 MPa or more and 0.6 MPa or less. package with a valve device.
Item 3. Item 3. A package with a valve device according to Item 1 or 2, wherein the valve device is a check valve.
Section 4. The valve device is
a valve mechanism for reducing the pressure inside the containing body when the pressure inside the containing body rises due to the gas generated inside the containing body;
a vent passage for guiding gas generated inside the container to the valve mechanism;
4. The package with a valve device according to any one of items 1 to 3, wherein the air passage includes a membrane that is permeable to gas and suppresses permeation of liquid.
Item 5. Item 5. A package with a valve device according to any one of Items 1 to 4, wherein the membrane is a polytetrafluoroethylene membrane.
Item 6. The heat-fusible resin layers face each other at the periphery of the container,
A peripheral joint portion is formed on the peripheral edge of the housing body, in which the heat-fusible resin layers facing each other are fused to each other,
At least a part of the valve device is sandwiched between the heat-fusible resin layers facing each other at the peripheral joint, so that the valve device is attached to the container,
The valve device is
a first portion having a valve mechanism formed therein for reducing the pressure inside the containing body when the pressure inside the containing body rises due to the gas generated inside the containing body;
a second portion formed therein with an air passage for guiding gas generated inside the container to the valve mechanism;
The first portion is located outside the edge of the peripheral joint,
Item 6. The package with a valve device according to any one of Items 1 to 5, wherein at least part of the second portion is sandwiched between the heat-fusible resin layers at the peripheral joint portion.
Item 7. In the thickness direction of the package, the length of the first portion is longer than the length of the second portion,
7. A package with a valve device according to Item 6, wherein a step is formed at the boundary between the first portion and the second portion.
Item 8. Item 8. A package with a valve device according to Item 6 or 7, wherein the length of the second portion in the width direction of the package is longer than the length of the second portion in the thickness direction of the package.
Item 9. Item 9. A package with a valve device according to any one of Items 6 to 8, wherein the second portion has a wing-shaped extended end that is formed thinner toward the end in the width direction of the package.
Item 10. Item 10. The package with a valve device according to any one of Items 6 to 9, wherein the air passage has a circular cross-sectional shape.
Item 11. 11. The valve device according to any one of items 6 to 10, wherein a cross-sectional length of the air passage in the width direction of the package is longer than a cross-sectional length of the air passage in the thickness direction of the package. Package with.
Item 12. Item 12. The package with a valve device according to any one of Items 6 to 11, wherein the second portion has a pillar formed in the air passage.
Item 13. Item 13. The package with a valve device according to any one of Items 6 to 12, wherein the outer surface of the second portion is pear-finished.
Item 14. Item 13. The package with a valve device according to any one of Items 6 to 12, wherein at least one protruding portion extending in the circumferential direction is formed on the outer surface of the second portion.
Item 15. Item 15. The packaging body with a valve device according to any one of Items 6 to 14, wherein, in the second portion, an end portion on the side opposite to the first portion side has rounded corners in plan view.
Item 16. a cross-sectional shape of the second portion normal to the center line of the air passage is a polygon;
Item 16. A package with a valve device according to any one of Items 6 to 15, wherein the corners of the polygon are rounded.
Item 17. each of the first and second portions is composed of a different material;
Item 17. The package with a valve device according to any one of Items 6 to 16, wherein the melting point of the material of the first portion is higher than the melting point of the material of the second portion.
Item 18. Item 18. The package with a valve device according to any one of Items 6 to 17, wherein at least a portion of the outer surface of at least one of the first and second portions is flat.
Item 19. an electricity storage device element;
a housing body configured by a laminate having at least a substrate layer, a barrier layer and a heat-fusible resin layer in this order, and housing the electricity storage device element therein;
a valve device that communicates with the inside of the container,
The valve device is configured to reduce the pressure when the pressure inside the container rises due to the gas generated inside the container,
The electricity storage device, wherein the maximum strain in the thickness direction of the container after the pressure inside the container rises and the gas inside the container is released from the valve device to the outside is less than 30%.
Item 20. an electricity storage device element;
a housing body configured by a laminate having at least a substrate layer, a barrier layer and a heat-fusible resin layer in this order, and housing the electricity storage device element therein;
a valve device that communicates with the inside of the container,
The heat-fusible resin layers face each other at the periphery of the container,
A peripheral joint portion is formed on the peripheral edge of the housing body, in which the heat-fusible resin layers facing each other are fused to each other,
At least a part of the valve device is sandwiched between the heat-fusible resin layers facing each other at the peripheral joint, so that the valve device is attached to the container,
The valve device is configured to reduce the pressure when the pressure inside the container rises due to the gas generated inside the container,
The electricity storage device, wherein the maximum strain in the thickness direction of the container after the pressure inside the container rises and the gas inside the container is released from the valve device to the outside is less than 30%.

10 Package with valve device 31 Base layer 32 Adhesive layer 33 Barrier layer 33a Crystal grain 34 Adhesive layer 35 Heat-fusible resin layer 40, 40I, 41, 41I Wing-shaped extended end 50 , 51 pillar, 60 protruding line portion, 100 container, 110, 110K, 120 packaging material, 112 forming portion, 114, 114K flange portion, 116K valve device placement portion, 130 peripheral joint portion, 200, 200A, 200B, 200C, 200D, 200E, 200F, 200G, 200H, 200I, 200J valve device, 210, 210A, 210B, 210C, 210E, 210F, 210G, 210H, 210I, 210J valve function part, 212 valve seat, 214 ball, 216 spring, 218 Membrane, 220, 220A, 220B, 220C, 220D, 220E, 220F, 220G, 220H, 220I, 220J Seal mounting part, 300 Tab, 310 Tab film, 400 Contents, A1, A2, A3, A4, A5, A6, A7 Vent, C1 Centerline, O1 Exhaust.

Claims (20)

a container configured by a laminate having at least a substrate layer, a barrier layer, and a heat-fusible resin layer in this order, and containing a content therein;
a valve device that communicates with the inside of the container,
The thickness of the base material layer is 3 μm or more and 50 μm or less,
The barrier layer has a thickness of 30 μm or more and 100 μm or less,
The heat-fusible resin layer has a thickness of 15 μm or more and 90 μm or less,
The laminate has a thickness of 50 μm or more and 250 μm or less,
The valve device is configured to reduce the pressure when the pressure inside the container rises due to the gas generated inside the container,
The valve device is set so that the valve device is opened when the differential pressure between the primary side and the secondary side of the valve device is within a range of 0.1 MPa or more and 0.6 MPa or less,
The valve device is a check valve,
A package with a valve device, wherein the maximum strain in the thickness direction of the container after the pressure inside the container rises and the gas inside the container is released from the valve device to the outside is less than 30%. body. In an environment of 80° C., when the valve function of the valve device is closed to increase the pressure inside the container, the pressure inside the container when the container ruptures is 0.5. The package with a valve device according to claim 1 , wherein the pressure is in the range of 3 MPa or more and 1 MPa or less . The maximum strain in the thickness direction of the container after the pressure inside the container rises and the gas inside the container is released from the valve device to the outside is 2% or more and less than 30% . Item 3. A package with a valve device according to Item 1 or 2. The valve device is
a valve mechanism for reducing the pressure inside the containing body when the pressure inside the containing body rises due to the gas generated inside the containing body;
a vent passage for guiding gas generated inside the container to the valve mechanism;
4. The package with a valve device according to any one of claims 1 to 3, wherein the air passage includes a membrane that is permeable to gas and suppresses permeation of liquid. 5. The package with a valve device according to claim 4 , wherein said membrane is a polytetrafluoroethylene membrane. The heat-fusible resin layers face each other at the periphery of the container,
A peripheral joint portion is formed on the peripheral edge of the housing body, in which the heat-fusible resin layers facing each other are fused to each other,
At least a part of the valve device is sandwiched between the heat-fusible resin layers facing each other at the peripheral joint, so that the valve device is attached to the container,
The valve device is
a first portion having a valve mechanism formed therein for reducing the pressure inside the containing body when the pressure inside the containing body rises due to the gas generated inside the containing body;
a second portion formed therein with an air passage for guiding gas generated inside the container to the valve mechanism;
The first portion is located outside the edge of the peripheral joint,
The package with a valve device according to any one of claims 1 to 5, wherein at least part of the second portion is sandwiched between the heat-fusible resin layers at the peripheral joint portion. In the thickness direction of the package, the length of the first portion is longer than the length of the second portion,
7. The package with a valve device according to claim 6, wherein a step is formed at the boundary between said first portion and said second portion. 8. The package with a valve device according to claim 6, wherein the length of the second portion in the width direction of the package is longer than the length of the second portion in the thickness direction of the package. The package with a valve device according to any one of claims 6 to 8, wherein the second portion has a wing-shaped extended end that is formed thinner toward the end in the width direction of the package. The package with a valve device according to any one of claims 6 to 9, wherein the air passage has a circular cross-sectional shape. The cross-sectional length of the air passage in the width direction of the package is longer than the cross-sectional length of the air passage in the thickness direction of the package, according to any one of claims 6 to 10. A package with a valve device. 12. A package with a valve device according to any one of claims 6 to 11, wherein said second portion has a pillar formed within said air passage. 13. The package with a valve device according to any one of claims 6 to 12, wherein the outer surface of said second portion is pear-finished. The package with a valve device according to any one of claims 6 to 12, wherein the outer surface of the second portion is formed with at least one protruding portion extending in the circumferential direction. 15. The package with a valve device according to any one of claims 6 to 14, wherein, in the second portion, an end portion on the side opposite to the first portion has rounded corners in a plan view. . a cross-sectional shape of the second portion normal to the center line of the air passage is a polygon;
16. The valve device-equipped package according to any one of claims 6 to 15, wherein the polygonal corners are rounded. each of the first and second portions is composed of a different material;
17. The package with a valve device according to any one of claims 6 to 16, wherein the melting point of the material of the first portion is higher than the melting point of the material of the second portion. 18. The package with a valve device according to any one of claims 6 to 17, wherein at least a portion of the outer surface of at least one of said first and second portions is flat. an electricity storage device element;
a housing body configured by a laminate having at least a substrate layer, a barrier layer and a heat-fusible resin layer in this order, and housing the electricity storage device element therein;
a valve device that communicates with the inside of the container,
The thickness of the base material layer is 3 μm or more and 50 μm or less,
The barrier layer has a thickness of 30 μm or more and 100 μm or less,
The heat-fusible resin layer has a thickness of 15 μm or more and 90 μm or less,
The laminate has a thickness of 50 μm or more and 250 μm or less,
The valve device is configured to reduce the pressure when the pressure inside the container rises due to the gas generated inside the container,
The valve device is set so that the valve device is opened when the differential pressure between the primary side and the secondary side of the valve device is within a range of 0.1 MPa or more and 0.6 MPa or less,
The valve device is a check valve,
The electricity storage device, wherein the maximum strain in the thickness direction of the container after the pressure inside the container rises and the gas inside the container is released from the valve device to the outside is less than 30%. an electricity storage device element;
a housing body configured by a laminate having at least a substrate layer, a barrier layer and a heat-fusible resin layer in this order, and housing the electricity storage device element therein;
a valve device that communicates with the inside of the container,
The thickness of the base material layer is 3 μm or more and 50 μm or less,
The barrier layer has a thickness of 30 μm or more and 100 μm or less,
The heat-fusible resin layer has a thickness of 15 μm or more and 90 μm or less,
The laminate has a thickness of 50 μm or more and 250 μm or less,
The heat-fusible resin layers face each other at the periphery of the container,
A peripheral joint portion is formed on the peripheral edge of the housing body, in which the heat-fusible resin layers facing each other are fused to each other,
At least a part of the valve device is sandwiched between the heat-fusible resin layers facing each other at the peripheral joint, so that the valve device is attached to the container,
The valve device is configured to reduce the pressure when the pressure inside the container rises due to the gas generated inside the container,
The valve device is set so that the valve device is opened when the differential pressure between the primary side and the secondary side of the valve device is within a range of 0.1 MPa or more and 0.6 MPa or less,
The valve device is a check valve,
The electricity storage device, wherein the maximum strain in the thickness direction of the container after the pressure inside the container rises and the gas inside the container is released from the valve device to the outside is less than 30%.

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