WO2020184689A1 - Packaging container and storage device - Google Patents

Packaging container and storage device Download PDF

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Publication number
WO2020184689A1
WO2020184689A1 PCT/JP2020/010965 JP2020010965W WO2020184689A1 WO 2020184689 A1 WO2020184689 A1 WO 2020184689A1 JP 2020010965 W JP2020010965 W JP 2020010965W WO 2020184689 A1 WO2020184689 A1 WO 2020184689A1
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WO
WIPO (PCT)
Prior art keywords
valve structure
packaging container
seal portion
valve
internal space
Prior art date
Application number
PCT/JP2020/010965
Other languages
French (fr)
Japanese (ja)
Inventor
高萩　敦子
美帆 佐々木
Original Assignee
大日本印刷株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 大日本印刷株式会社 filed Critical 大日本印刷株式会社
Priority to JP2021505148A priority Critical patent/JPWO2020184689A1/ja
Publication of WO2020184689A1 publication Critical patent/WO2020184689A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/01—Ventilation or drainage of bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a packaging container and a power storage device including the packaging container.
  • Patent Document 1 discloses a battery in which a battery element is housed in a pouch-shaped container.
  • a valve structure having a check valve is attached to a seal portion formed along the peripheral edge of the container. This check valve is configured to operate when the internal pressure of the container rises above a certain level to vent gas.
  • the present invention is a packaging container having a valve structure for venting gas, and a packaging container capable of suppressing the liquid contained therein from entering a passage in the valve structure and impairing its function. It is an object of the present invention to provide a power storage device comprising the above.
  • the present invention is not limited to the above-mentioned example of the power storage device, and can be applied to all packaging containers that can block the liquid contained in the packaging container when it enters the passage in the valve structure.
  • the packaging container includes a container body and a valve structure.
  • the container body is made of a packaging material and has a peripheral seal portion that defines the peripheral edge of the internal space.
  • the valve structure is attached to the peripheral seal portion and has a passage for communicating the internal space with the external space, and when the pressure in the internal space is increased by the gas generated in the internal space, the passage is provided. The gas is released through.
  • the passage has an inlet facing the interior space and an exit facing the exterior space.
  • the container body further has a pattern seal portion including a sealed region and a non-sealed region. The unsealed region forms a plurality of flow paths that guide the gas generated in the internal space to the inlet.
  • the seal region defines the wall surface of the plurality of flow paths.
  • the packaging container according to the second aspect of the present invention is the packaging container according to the first aspect, and the pattern seal portion is formed at least around the inlet.
  • the packaging container according to the third aspect of the present invention is the packaging container according to the first aspect or the second aspect, and the pattern seal portion is not in contact with the external space.
  • the packaging container according to the fourth aspect of the present invention is a packaging container according to any one of the first to third aspects, and the pattern seal portion is arranged so as to surround the entrance.
  • the packaging container according to the fifth aspect of the present invention is a packaging container according to any one of the first to fourth aspects, and the valve structure includes a check valve.
  • the packaging container according to the sixth aspect of the present invention is a packaging container according to any one of the first to fifth aspects, and the valve structure includes a breaking valve.
  • the power storage device is a packaging container according to any one of the first to sixth aspects, and the packaging material is composed of a laminated film.
  • the power storage device is a packaging container according to any one of the first to seventh aspects, and is adhered to the outer surface of the valve structure and to the peripheral seal portion. Further provided with an adhesive member.
  • the power storage device includes a packaging container according to any one of the first to eighth aspects and a power storage device element housed in the internal space.
  • a packaging container provided with a valve structure for venting gas.
  • the valve structure is attached to the peripheral seal portion of the container body.
  • the container body has a pattern seal portion including a sealed region and a non-sealed region.
  • the unsealed region forms a plurality of channels, which extend so as to guide the gas generated in the vessel body to the inlet of the valve structure.
  • the sealing area defines the walls of these channels.
  • the plurality of flow paths formed by such a pattern seal portion have a more complicated configuration as a whole flow path than when a single flow path is formed, and the liquid in the container body is a valve structure. It becomes a resistance to reach the entrance of.
  • the gas generated in the container body has higher fluidity than the liquid, so that it easily passes through the flow path. Therefore, according to the above configuration, it is possible to prevent the liquid contained in the packaging container from entering the passage in the valve structure and impairing the function while ensuring the function of venting the gas by the valve structure. it can.
  • FIG. 1 is a sectional view taken along line II-II of FIG. Top view of the valve structure.
  • FIG. 3 is a sectional view taken along line IV-IV of FIG.
  • FIG. 3 is a sectional view taken along line VV of FIG.
  • FIG. 11 is a cross-sectional view taken along the line XII-XII.
  • FIG. 1 shows a plan view of the power storage device 1 including the packaging container 10 according to the present embodiment.
  • FIG. 2 is a sectional view taken along line II-II of FIG.
  • the parts that are originally invisible from the outside are partially shown by dotted lines for reference.
  • the vertical direction of FIG. 1 is referred to as "front and back”
  • the horizontal direction is referred to as “left and right”
  • the vertical direction of FIG. 2 is referred to as "up and down”.
  • the orientation of the power storage device 1 when used is not limited to this.
  • the packaging container 10 of the present embodiment is used as a power storage device, and includes a tab 300 and a tab film 310 attached to the container body 100 in addition to the container body 100.
  • the power storage device element 400 is housed in the internal space S1 of the container body 100.
  • the container body 100 is composed of packaging materials 110 and 120.
  • the packaging materials 110 and 120 are heat-sealed and fused to each other on the outer peripheral portion of the container body 100 when viewed from a direction orthogonal to the vertical direction, whereby the peripheral edge sealing portion 130 is formed.
  • the peripheral space S1 of the container body 100 that is shielded from the external space is formed by the peripheral seal portion 130.
  • the peripheral edge sealing portion 130 defines the peripheral edge of the internal space S1 of the container body 100 when viewed from a direction orthogonal to the vertical direction.
  • modes such as heat welding from a heat source and ultrasonic welding are assumed.
  • the peripheral seal portion 130 means a portion where the packaging materials 110 and 120 are fused and integrated.
  • the packaging materials 110 and 120 are made of, for example, a resin molded product or a film.
  • the resin molded product referred to here can be manufactured by a method such as injection molding, compressed air molding, vacuum forming, blow molding, or the like, and in-mold molding may be performed in order to impart designability and functionality.
  • the type of resin may be polyolefin, polyester, nylon, ABS, or the like.
  • the film referred to here is, for example, a plastic film or a metal foil that can be manufactured by a method such as an inflation method or a T-die method.
  • the film referred to here may or may not be stretched, and may be a single-layer film or a laminated film.
  • the laminated film referred to here may be produced by a coating method, a plurality of films bonded by an adhesive or the like, or may be produced by a multilayer extrusion method.
  • the packaging materials 110 and 120 can be variously composed, but in the present embodiment, they are composed of a laminated film.
  • the laminated film can be a laminated body in which a base material layer, a barrier layer and a thermosetting resin layer are laminated.
  • the base material layer functions as a base material for the packaging materials 110 and 120, and is typically a resin layer that forms the outermost layer of the container body 100 and has an insulating property.
  • the barrier layer has a function of improving the strength of the packaging materials 110 and 120 and preventing water vapor, oxygen, light, etc. from entering the power storage device 1, and is typically a metal layer made of aluminum or the like. is there.
  • the thermosetting resin layer is typically made of a thermosetting resin such as polyolefin, and forms the innermost layer of the container body 100.
  • the shape of the container body 100 is not particularly limited, and can be, for example, a bag shape (pouch shape).
  • the bag shape referred to here may be a three-way seal type, a four-way seal type, a pillow type, a gusset type, or the like.
  • the container body 100 of this embodiment has the shapes shown in FIGS. 1 and 2. That is, the container body 100 of the present embodiment heat-seals the tray-shaped packaging material 110 and the sheet-shaped packaging material 120 superposed on the tray-shaped packaging material 120 along the outer peripheral portion in a plan view. Manufactured.
  • the packaging material 110 includes an annular flange portion 114 corresponding to an outer peripheral portion in a plan view, and a molding portion 112 that is continuous with the inner edge of the flange portion 114 and bulges downward from the flange portion 114.
  • the flange portion 114 and the outer peripheral portion of the packaging material 120 facing the flange portion 114 in a plan view are heat-sealed so as to be integrated to form the peripheral edge seal portion 130.
  • the peripheral edge seal portion 130 extends over the entire outer circumference of the container body 100 and is formed in an annular shape.
  • the packaging material 110 may have the same shape as the packaging material 120, or the packaging material 120 may have the same shape as the packaging material 110.
  • the power storage device element 400 is, for example, a power storage member such as a lithium ion battery (secondary battery) or a capacitor, and includes an electrolytic solution.
  • a power storage member such as a lithium ion battery (secondary battery) or a capacitor
  • an electrolytic solution When an abnormality occurs in the power storage device element 400, gas may be generated in the internal space S1 of the container body 100. Further, when the power storage device element 400 is a capacitor, gas may be generated in the internal space S1 of the container body 100 due to a chemical reaction in the capacitor.
  • Either a primary battery or a secondary battery may be housed in the packaging container 10, but a secondary battery is preferably housed.
  • the type of the secondary battery housed in the packaging container 10 is not particularly limited, and for example, in addition to the lithium ion battery, a lithium ion polymer battery, an all-solid-state battery, a lead storage battery, a nickel / hydrogen storage battery, a nickel / cadmium storage battery, etc.
  • Examples thereof include nickel / iron storage batteries, nickel / zinc storage batteries, silver oxide / zinc storage batteries, metal air batteries, polyvalent cation batteries, capacitors, and capacitors.
  • the tab 300 is a metal terminal used for input / output of electric power in the power storage device element 400.
  • the tabs 300 are separately arranged at the left and right ends of the container body 100, one of which constitutes a terminal on the positive electrode side and the other of which constitutes a terminal on the negative electrode side.
  • One end of each tab 300 in the left-right direction is electrically connected to an electrode (positive electrode or negative electrode) of the power storage device element 400 in the internal space S1 of the container body 100, and the other end is a peripheral seal portion. It protrudes outward from 130.
  • the above-described form of the power storage device 1 is particularly preferable for use in an electric vehicle such as an electric vehicle or a hybrid vehicle in which a large number of power storage devices 1 are connected in series and used at a high voltage.
  • the metal material constituting the tab 300 is, for example, aluminum, nickel, copper, or the like.
  • the tab 300 connected to the positive electrode is typically made of aluminum or the like, and the tab 300 connected to the negative electrode is typically copper, nickel or the like. Consists of.
  • the tab 300 on the left side is sandwiched between the packaging materials 110 and 120 via the tab film 310 at the left end portion of the peripheral seal portion 130.
  • the tab 300 on the right side is also sandwiched between the packaging materials 110 and 120 via the tab film 310 at the right end portion of the peripheral sealing portion 130.
  • the tab film 310 is an adhesive film and is configured to adhere to both the packaging materials 110 and 120 and the tab 300 (metal). By passing through the tab film 310, even if the tab 300 and the innermost layers (thermosetting resin layers) of the packaging materials 110 and 120 are different materials, both can be fixed.
  • the packaging container 10 includes a valve structure 200 as a mechanism for preventing such a situation.
  • the valve structure 200 is a gas vent valve for adjusting the pressure in the internal space S1, and is attached to the peripheral seal portion 130 of the container body 100.
  • the container body 100 of the present embodiment is formed with a pattern seal portion 500 in order to maintain the degassing function of the valve structure 200.
  • the configurations of the valve structure 200 and the pattern seal portion 500 will be described in detail.
  • FIG. 3 is a plan view of the valve structure 200.
  • FIG. 4 is a sectional view taken along line IV-IV of FIG. 3
  • FIG. 5 is a sectional view taken along line VV of FIG.
  • the valve structure 200 of the present embodiment is a check valve capable of repeatedly venting gas, and is particularly a ball spring type check valve.
  • the valve structure 200 is a relief valve that switches between an open state and a closed state according to the pressure in the internal space S1.
  • the valve structure 200 includes a valve function portion 210 and a mounting portion 220.
  • the mounting portion 220 is a portion for mounting the valve structure 200 to the container body 100.
  • the mounting portion 220 is fixed to the container body 100 by being heat-sealed while being sandwiched between the packaging materials 110 and 120 constituting the peripheral seal portion 130 (see FIG. 2).
  • the valve function portion 210 is arranged outside the peripheral edge sealing portion 130 and is not sandwiched between the packaging materials 110 and 120 (see FIGS. 1 and 2).
  • the heat generated when the mounting portion 220 is attached to the container body 100 by the heat seal reduces the possibility that various parts constituting the valve function portion 210 will be destroyed due to deformation or the like.
  • the mounting portion 220 is preferably composed of a material that directly adheres to the innermost layers of the packaging materials 110 and 120.
  • the mounting portion 220 can be made of a material having the same heat-sealing properties as the innermost layers of the packaging materials 110 and 120, for example, a resin such as polyolefin. If the mounting portion 220 cannot be made of the above materials due to heat resistance or the like, these can be attached via a film that can be adhered to both the mounting portion 220 and the innermost layers of the packaging materials 110 and 120. Can be glued.
  • the mounting portion 220 is connected to the valve function portion 210.
  • the outer shapes of the valve function portion 210 and the mounting portion 220 are each substantially cylindrical and coaxial with each other.
  • the central axis common to both is represented by reference numeral C1.
  • the central axis C1 extends parallel to or substantially parallel to the front-rear direction.
  • the valve function portion 210 and the mounting portion 220 are both tubular as a whole.
  • the inner space of the valve function portion 210 and the inner space of the attachment portion 220 communicate with each other, whereby a passage L1 is formed inside the valve structure 200.
  • the passage L1 extends along the central axis C1 direction.
  • the passage L1 has an inlet O1 facing the internal space S1 of the container body 100 and an outlet O2 facing the external space. Therefore, the passage L1 communicates the internal space S1 with the external space in the open state of the valve structure 200.
  • the valve structure 200 seals the internal space S1 from the external space in the closed state. When the pressure in the internal space S1 rises due to the gas generated in the internal space S1, the valve structure 200 is opened and the gas is discharged to the external space through the passage L1.
  • the valve function unit 210 has a tubular body 211, an O-ring 212, a ball 214, and a spring 216.
  • the tubular body 211 and the mounting portion 220 can be integrally configured, or can be manufactured as separate parts and then connected to each other.
  • the tubular body 211 may be made of a metal such as stainless steel, or may be made of a resin such as polyolefin.
  • the tubular body 211 defines an internal space as a part of the passage L1, and the O-ring 212, the ball 214, and the spring 216 are arranged in this order toward the outside in the central axis C1 direction in the internal space.
  • the tubular body 211 has a valve seat 211a.
  • the valve seat 211a defines an inverted truncated cone-shaped space whose diameter increases toward the external space as a part of the internal space of the tubular body 211.
  • the valve seat 211a receives the ball 214 as a valve body urged from the outside by the spring 216, and at this time, the closed state of the valve structure 200 is formed.
  • the spring 216 is a coil spring in the example of FIG. 5, but the spring 216 is not limited to this, and may be, for example, a leaf spring.
  • the O-ring 212 eliminates the gap between the ball 214 and the valve seat 211a and assists in improving the airtightness in the closed state.
  • the O-ring 212 is a hollow circular ring, and is made of, for example, fluororubber.
  • the materials of the balls 214 and the springs 216 are not particularly limited, and for example, both may be made of metal such as stainless steel. Further, the ball 214 may be made of resin or rubber.
  • the internal space of the mounting portion 220 communicates with the internal space S1 of the container body 100.
  • the pressure in the internal space S1 that is, the pressure in the internal space of the mounting portion 220 reaches a predetermined pressure
  • the gas guided from the internal space S1 presses the ball 214 upward in FIG.
  • the spring 216 is deformed and the ball 214 moves upward to form an open state of the valve structure 200.
  • the gas generated in the internal space S1 flows out into the valve function portion 210 through the gap formed between the ball 214 and the O-ring 212, and is further discharged to the external space through the outlet O2. Will be done.
  • the valve structure 200 can prevent the entry of air into the internal space S1 of the container body 100 in the closed state. On the other hand, even in the open state, it is unlikely that the atmosphere will enter the internal space S1. This is because, in the open state, the pressure in the internal space S1 is maintained higher than or equivalent to the pressure in the external space. Therefore, the valve structure 200 can effectively prevent the entry of the atmosphere into the container body 100, and can prevent the power storage device element 400 from being deteriorated by the moisture contained therein.
  • the valve structure 200 is a gas vent valve that adjusts the pressure in the internal space S1 of the container body 100.
  • the liquid mainly the electrolytic solution
  • the degassing function of the valve structure 200 may be impaired. This is because a solid such as a salt or an electrolytic solution component precipitated from such a liquid can block the passage L1.
  • the container body 100 has a pattern seal portion 500 shown by hatching in a diagonal line in FIG. 1 around the inlet O1 of the valve structure 200.
  • FIG. 6 is an enlarged plan view of the periphery of the pattern seal portion 500.
  • the heat-sealed seal area is indicated by cross-line hatching.
  • the unsealed area that is not heat-sealed is shown without hatching and filling.
  • the enclosed line of the alternate long and short dash line indicating the pattern seal portion 500 is a reference line and is not actually visible.
  • the pattern seal portion referred to here does not mean a solid seal portion that is sealed substantially without gaps, but a region in which a pattern or a pattern is formed as a whole by combining a seal region and a non-seal region. To do.
  • the heat-sealed sealing region means a portion where the facing packaging materials 110 and 120 are fused and integrated.
  • the pattern seal portion 500 is arranged so as to surround the inlet O1 of the attachment portion 220 of the valve structure 200. Therefore, the gas and the liquid in the internal space S1 of the container body 100 cannot reach the inlet O1 of the valve structure 200 without passing through the pattern seal portion 500.
  • the dotted line indicates the portion of the mounting portion 220 that is attached to the peripheral seal portion 130.
  • the non-seal region 520 included in the pattern seal portion 500 forms a plurality of flow paths L2 extending so as to branch, and the seal region 510 included in the pattern seal portion 500 defines the wall surface of these flow paths L2.
  • These flow paths L2 extend so as to guide the gas generated in the internal space S1 to the inlet O1. Therefore, through these flow paths L2, the passage L1 in the valve structure 200 is inside the central portion of the internal space S1 (excluding the space formed by the flow path L2 in the internal space S1) and inside the pattern seal portion 500. It communicates with the space).
  • the sealed region 510 is arranged so as to branch the flow path L2 formed by the non-sealed region 520. Therefore, as compared with the case where the pattern seal portion 500 does not exist and the entire region occupied by the pattern seal portion 500 is the non-seal region, the flow reaching the inlet O1 from the central portion of the internal space S1 around the inlet O1 of the valve structure 200.
  • the road is narrowed.
  • the shape of the flow path L2, which is branched in this way and whose cross-sectional area (pipe diameter) is narrowed, is the resistance until the liquid in the internal space S1 passes through the flow path L2 and reaches the inlet O1 of the valve structure 200. (Piping resistance) is increased.
  • the frictional force acting between the wall surface of the flow path L2 defined by the seal region 510 and the liquid increases, and it becomes difficult for the liquid to enter the pattern seal portion 500.
  • the shape of the flow path L2 as described above can be a resistance to reach the inlet O1.
  • the pattern seal portion 500 allows sufficient permeation of gas while suppressing permeation of liquid.
  • the pattern seal portion 500 stably guides the gas in the internal space S1 into the passage L1 of the valve structure 200, while the liquid in the internal space S1 invades the passage L1 and impairs its function. Can be suppressed.
  • the pattern seal portion 500 of the present embodiment forms a pattern in which elongated seal regions 510 extending in the left-right direction are intermittently arranged. More specifically, patterns in which elongated seal regions 510 extending in the left-right direction are arranged at intervals in the left-right direction are arranged in a multi-stage configuration in the front-rear direction. It should be noted that the patterns of each stage may be the same or different (the matching and the difference here do not consider the deviation in the left-right direction, and the patterns overlap when they are translated. Matching and not overlapping is called difference).
  • the seal regions 510 are staggered in adjacent steps.
  • the non-seal region 520 between the seal regions 510 in a certain stage overlaps with the seal region 510 in the adjacent stage with reference to the left-right direction.
  • the flow path L2 is bent many times in the pattern seal portion 500 and comes into contact with the wall surface formed by the seal region 510 in a larger area. Therefore, the pattern seal portion 500 having such a shape can efficiently suppress the permeation of the liquid.
  • the peripheral seal portion 130 is a solid seal portion, and together with the mounting portion 220, surrounds the pattern seal portion 500 from the outside.
  • the pattern seal portion 500 is not in contact with the external space in a plan view, and the gas and liquid in the internal space S1 do not leak directly from the flow path L2 to the outside.
  • the packaging container 10 of the above embodiment is configured for a power storage device, but the use of the packaging container according to the present invention is not limited to this, and the contents thereof are not particularly limited.
  • the packaging container according to the present invention has contents that generate gas with the passage of time, and contains components that may clog the passage such as solidifying when entering the passage of the valve structure. Excellent for accommodating contents containing liquids contained.
  • the valve structure 200 of the above embodiment is a ball spring type, but is not limited to this, and may be, for example, a poppet type, a duck bill type, an umbrella type, a diaphragm type, or the like.
  • the valve body included in the valve structure 200 of the above embodiment is a spherical ball 214, but the shape is not limited to such a shape, and various shapes are adopted as long as the valve body functions as a valve body. be able to.
  • the valve body may be hemispherical, oblong, or oblate.
  • the spherical side may be received by the valve seat 211a, and a columnar member may extend from the central portion of the flat surface on the opposite side to the spherical surface to the opposite side to the spherical surface.
  • the position of the valve body in the tubular body 211 can be stabilized by configuring the columnar member so as to receive it inside the spring 216.
  • valve structure 200 of the above embodiment is a check valve capable of repeatedly degassing, but may be a destructive valve capable of degassing only once.
  • the number of valve mechanisms included in the valve structure 200 is not particularly limited.
  • the valve structure 200 may include both a check valve and a break valve, and includes a plurality of break valves. It may be included, or may include a plurality of check valves.
  • the break valve referred to in this modification can be configured in various ways.
  • the break valve can be constructed by a thin plate or film 250 arranged so as to block the passage L1 in the valve structure 200.
  • This breaking valve (hereinafter, the breaking valve is designated by the reference numeral 250) can be configured, for example, by attaching a laminate film to the cylinder 211 by heat sealing so as to cover the outlet O2.
  • the breaking valve 250 may be a thin plate made of metal such as aluminum, and as shown in FIG.
  • a notch 251 extending radially from the vicinity of the center thereof may be formed in the thin plate.
  • the notch portion 251 does not penetrate the break valve 250 in the thickness direction, and is formed thinner than other portions.
  • the breaking valve 250 can be opened by breaking the breaking valve 250 instead of dropping it from the cylinder 211.
  • the pattern formed by the pattern seal portion 500 is not limited to that described in the above embodiment.
  • the pattern seal portion 500 may be formed by arranging the cross-shaped seal regions 510A at intervals.
  • the pattern seal portion 500 may have only one continuous seal region 510B.
  • the flow path L2 is branched, and the pattern seal portion 500 can suppress the permeation of the liquid.
  • the seal region included in the pattern seal portion 500 can have any shape such as a circle, a square, and a star shape.
  • the arrangement of the pattern seal portion 500 in the container body 100 is not limited to the vicinity of the inlet O1 of the valve structure 200 as in the above embodiment.
  • the pattern seal portion 500A may be formed at a position adjacent to the peripheral seal portion 130 along the entire circumference of the inner end portion of the peripheral seal portion 130.
  • a pattern seal portion 500B is formed in the peripheral seal portion 130 at a position adjacent to the peripheral seal portion 130 along the entire side to which the valve structure 200 is attached. May be good.
  • a pattern seal portion 500 as shown in FIG. 10 is also conceivable. That is, in the above-described aspects of FIGS. 6, 8A and 8B, the branch point of the flow path L2 was located around the inlet O1 of the valve structure 200, but as shown in FIG. 10, the seal region 510C The branch point of the flow path L2 formed by the disconnection may be arranged at a position away from the periphery of the inlet O1 of the valve structure 200.
  • the adhesive member is a member having adhesiveness to both the mounting portion 220 of the valve structure 200 and the packaging materials 110 and 120 constituting the peripheral seal portion 130, and is, for example, as shown in FIGS. 11 and 12. It can be configured as an adhesive film 600.
  • FIG. 11 is an enlarged plan view of the periphery of the mounting portion 220 of the valve structure 200
  • FIG. 12 is a sectional view taken along line XII-XII thereof.
  • the mounting portion 220 is sandwiched between the packaging materials 110 and 120 via the adhesive film 600.
  • the adhesive film 600 By using the adhesive film 600 in this way, even if the outer surface of the mounting portion 220 and the innermost layers (thermosetting resin layers) of the packaging materials 110 and 120 are different materials, both are firmly fixed. can do.
  • the portion of the adhesive film 600 sandwiched between the packaging materials 110 and 120 cannot be visually recognized, but in the same figure, the position of the portion is indicated by a dotted line for reference. ..
  • the adhesive film 600 is heat-sealed together with the mounting portion 220 while being sandwiched between the packaging materials 110 and 120 constituting the peripheral seal portion 130 when the container body 100 is molded. By this heat seal, the outer surface of the mounting portion 220 and the innermost layer of the adhesive film 600 are fused and joined, and the innermost layers of the packaging materials 110 and 120 and the outermost layer of the adhesive film 600 are fused. Be joined.
  • the innermost layer of the adhesive film 600 is preferably composed of a material that easily adheres to the mounting portion 220.
  • the outermost layer of the adhesive film 600 is preferably composed of a material that easily adheres to the innermost layers of the packaging materials 110 and 120.
  • the adhesive film 600 may be a single-layer film of maleic anhydride-modified polypropylene (PPa).
  • PPa maleic anhydride-modified polypropylene
  • the adhesive film 600 is preferably a laminated film having a three-layer structure or a three-layer or more structure having a core material between the innermost layer and the outermost layer.
  • the adhesive film 600 may be, for example, a laminated film of PPa, polyethylene naphthalate (PEN) as a core material, and PPa, or a laminated film of PPa, polypropylene (PP) as a core material, and PPa. It may be.
  • PEN polyethylene naphthalate
  • PPa polypropylene
  • the core material polyester fiber, polyamide fiber, carbon fiber and the like can also be preferably used.
  • a resin that can be adhered to a metal such as an ionomer resin, modified polyethylene, and EVA can also be applied.
  • Power storage device 10 Packaging container 100 Container body 130 Peripheral seal part 200 Valve structure 400 Power storage device element 500, 500A, 500B Pattern seal part 510, 510A, 510B, 510C Seal area 520 Non-seal area L1 Passage L2 Flow path O1 Inlet O2 Exit S1 internal space

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Abstract

Provided is a packaging container having a valve structure for gas purging, the packaging container being capable of preventing a liquid accommodated therein from intruding a passage inside the valve structure and impairing a function thereof. The packaging container further has a container body. The container body has a peripheral seal part. The valve structure is a gas purging valve that is attached to the peripheral seal part and has a passage causing the inside and outside of the container body to communicate with each other. The container body further has a pattern seal part including a seal region and a non-seal region at least on the periphery of the entrance of the valve structure. The non-seal region forms a plurality of flow passages extending so as to guide gas inside the container body to the entrance of the valve structure. The seal region defines wall surfaces of the plurality of flow passages.

Description

包装容器及びこれを備える蓄電デバイスPackaging container and power storage device equipped with it
　本発明は、包装容器及びこれを備える蓄電デバイスに関する。 The present invention relates to a packaging container and a power storage device including the packaging container.
　特許文献１は、電池素子をパウチ状の容器に収容した電池を開示している。この容器には、その周縁に沿って形成されるシール部に、逆止弁を有する弁構造体が取り付けられる。この逆止弁は、容器の内圧が一定以上に上昇した場合に作動し、ガス抜きを行うように構成されている。 Patent Document 1 discloses a battery in which a battery element is housed in a pouch-shaped container. A valve structure having a check valve is attached to a seal portion formed along the peripheral edge of the container. This check valve is configured to operate when the internal pressure of the container rises above a certain level to vent gas.
特開２０１６－３１９３４号公報Japanese Unexamined Patent Publication No. 2016-31934
　しかし、容器に収容される電解液が弁構造体内の通路に侵入すると、塩や電解液成分等が析出して当該通路を塞ぎ、弁構造体のガス抜きの機能が損なわれることがある。 However, if the electrolytic solution contained in the container invades the passage inside the valve structure, salts, electrolyte components, etc. may precipitate and block the passage, impairing the degassing function of the valve structure.
　本発明は、ガス抜き用の弁構造体を有する包装容器であって、これに収容される液体が弁構造体内の通路に侵入し、その機能を損なうことを抑制することができる包装容器及びこれを備える蓄電デバイスを提供することを目的とする。なお、本発明は、上記のような蓄電デバイスの例に限らず、包装容器に収容される液体が弁構造体内の通路に侵入したときに、これを塞ぎ得る包装容器全般に適用され得る。 The present invention is a packaging container having a valve structure for venting gas, and a packaging container capable of suppressing the liquid contained therein from entering a passage in the valve structure and impairing its function. It is an object of the present invention to provide a power storage device comprising the above. The present invention is not limited to the above-mentioned example of the power storage device, and can be applied to all packaging containers that can block the liquid contained in the packaging container when it enters the passage in the valve structure.
　本発明の第１観点に係る包装容器は、容器本体と、弁構造体とを備える。前記容器本体は、包装材料で構成されており、内部空間の周縁を画定する周縁シール部を有する。前記弁構造体は、前記周縁シール部に取り付けられ、前記内部空間を外部空間に連通させる通路を有し、前記内部空間で発生したガスにより前記内部空間の圧力が上昇した場合に、前記通路を介して当該ガスを放出する。前記通路は、前記内部空間に面する入口及び前記外部空間に面する出口を有する。前記容器本体は、シール領域及び非シール領域を含むパターンシール部をさらに有する。前記非シール領域は、前記内部空間で発生した前記ガスを前記入口まで導く複数の流路を形成する。前記シール領域は、前記複数の流路の壁面を画定する。 The packaging container according to the first aspect of the present invention includes a container body and a valve structure. The container body is made of a packaging material and has a peripheral seal portion that defines the peripheral edge of the internal space. The valve structure is attached to the peripheral seal portion and has a passage for communicating the internal space with the external space, and when the pressure in the internal space is increased by the gas generated in the internal space, the passage is provided. The gas is released through. The passage has an inlet facing the interior space and an exit facing the exterior space. The container body further has a pattern seal portion including a sealed region and a non-sealed region. The unsealed region forms a plurality of flow paths that guide the gas generated in the internal space to the inlet. The seal region defines the wall surface of the plurality of flow paths.
　本発明の第２観点に係る包装容器は、第１観点に係る包装容器であって、前記パターンシール部は、少なくとも前記入口の周辺に形成される。 The packaging container according to the second aspect of the present invention is the packaging container according to the first aspect, and the pattern seal portion is formed at least around the inlet.
　本発明の第３観点に係る包装容器は、第１観点又は第２観点に係る包装容器であって、前記パターンシール部は、前記外部空間に接していない。 The packaging container according to the third aspect of the present invention is the packaging container according to the first aspect or the second aspect, and the pattern seal portion is not in contact with the external space.
　本発明の第４観点に係る包装容器は、第１観点から第３観点のいずれかに係る包装容器であって、前記パターンシール部は、前記入口を囲むように配置される。 The packaging container according to the fourth aspect of the present invention is a packaging container according to any one of the first to third aspects, and the pattern seal portion is arranged so as to surround the entrance.
　本発明の第５観点に係る包装容器は、第１観点から第４観点のいずれかに係る包装容器であって、前記弁構造体は、逆止弁を含む。 The packaging container according to the fifth aspect of the present invention is a packaging container according to any one of the first to fourth aspects, and the valve structure includes a check valve.
　本発明の第６観点に係る包装容器は、第１観点から第５観点のいずれかに係る包装容器であって、前記弁構造体は、破壊弁を含む。 The packaging container according to the sixth aspect of the present invention is a packaging container according to any one of the first to fifth aspects, and the valve structure includes a breaking valve.
　本発明の第７観点に係る蓄電デバイスは、第１観点から第６観点のいずれかに係る包装容器であって、前記包装材料は、ラミネートフィルムから構成される。 The power storage device according to the seventh aspect of the present invention is a packaging container according to any one of the first to sixth aspects, and the packaging material is composed of a laminated film.
　本発明の第８観点に係る蓄電デバイスは、第１観点から第７観点のいずれかに係る包装容器であって、前記弁構造体の外面に接着され、かつ、前記周縁シール部に接着される接着性部材をさらに備える。
The power storage device according to the eighth aspect of the present invention is a packaging container according to any one of the first to seventh aspects, and is adhered to the outer surface of the valve structure and to the peripheral seal portion. Further provided with an adhesive member.
　本発明の第９観点に係る蓄電デバイスは、第１観点から第８観点のいずれかに係る包装容器と、前記内部空間に収容される蓄電デバイス素子とを備える。 The power storage device according to the ninth aspect of the present invention includes a packaging container according to any one of the first to eighth aspects and a power storage device element housed in the internal space.
　本発明によれば、ガス抜き用の弁構造体を備える包装容器が提供される。弁構造体は、容器本体の周縁シール部に取り付けられる。容器本体は、シール領域及び非シール領域を含むパターンシール部を有する。非シール領域は、複数の流路を形成し、これらの流路は、容器本体内で発生したガスを弁構造体の入口まで導くように延びる。シール領域は、これらの流路の壁面を画定する。このようなパターンシール部により形成される複数の流路は、単一の流路が形成される場合に比べ、流路全体としての構成がより複雑になり、容器本体内の液体が弁構造体の入口に達することの抵抗となる。一方で、容器本体内で発生したガスは、液体と比較して流動性が高いため、当該流路を通過し易い。よって、以上の構成によれば、弁構造体によるガス抜きの機能を確保しつつも、包装容器に収容される液体が弁構造体内の通路に侵入し、その機能を損なうことを抑制することができる。 According to the present invention, a packaging container provided with a valve structure for venting gas is provided. The valve structure is attached to the peripheral seal portion of the container body. The container body has a pattern seal portion including a sealed region and a non-sealed region. The unsealed region forms a plurality of channels, which extend so as to guide the gas generated in the vessel body to the inlet of the valve structure. The sealing area defines the walls of these channels. The plurality of flow paths formed by such a pattern seal portion have a more complicated configuration as a whole flow path than when a single flow path is formed, and the liquid in the container body is a valve structure. It becomes a resistance to reach the entrance of. On the other hand, the gas generated in the container body has higher fluidity than the liquid, so that it easily passes through the flow path. Therefore, according to the above configuration, it is possible to prevent the liquid contained in the packaging container from entering the passage in the valve structure and impairing the function while ensuring the function of venting the gas by the valve structure. it can.
本発明の一実施形態に係る包装容器を備える蓄電デバイスの平面図。The plan view of the power storage device including the packaging container which concerns on one Embodiment of this invention. 図１のＩＩ－ＩＩ断面図。FIG. 1 is a sectional view taken along line II-II of FIG. 弁構造体の平面図。Top view of the valve structure. 図３のＩＶ－ＩＶ断面図。FIG. 3 is a sectional view taken along line IV-IV of FIG. 図３のＶ－Ｖ断面図。FIG. 3 is a sectional view taken along line VV of FIG. パターンシール部の周辺の拡大平面図。An enlarged plan view of the periphery of the pattern seal portion. ある変形例に係る弁構造体の断面図。Sectional drawing of the valve structure which concerns on a certain modification. ある変形例に係る弁構造体に含まれる破壊弁を示す図。The figure which shows the breaking valve included in the valve structure which concerns on a certain modification. ある変形例に係るパターンシール部の周辺の拡大平面図。An enlarged plan view of the periphery of the pattern seal portion according to a certain modification. 別の変形例に係るパターンシール部の周辺の拡大平面図。An enlarged plan view of the periphery of the pattern seal portion according to another modification. ある変形例に係るパターンシール部の配置を示す蓄電デバイスの平面図。The plan view of the power storage device which shows the arrangement of the pattern seal part which concerns on a certain modification. 別の変形例に係るパターンシール部の配置を示す蓄電デバイスの平面図。The plan view of the power storage device which shows the arrangement of the pattern seal part which concerns on another modification. さらに別の変形例に係るパターンシール部を示す蓄電デバイスの平面図。The plan view of the power storage device which shows the pattern seal part which concerns on still another modification. 弁構造体の取付部の周辺の拡大平面図。Enlarged plan view around the mounting part of the valve structure. 図１１のＸＩＩ－ＸＩＩ断面図。FIG. 11 is a cross-sectional view taken along the line XII-XII.
　以下、図面を参照しつつ、本発明の一実施形態に係る包装容器及びこれを備える蓄電デバイスについて説明する。 Hereinafter, a packaging container according to an embodiment of the present invention and a power storage device including the packaging container will be described with reference to the drawings.
　＜１．蓄電デバイスの全体構成＞
　図１に、本実施形態に係る包装容器１０を備える蓄電デバイス１の平面図を示す。図２は、図１のＩＩ－ＩＩ断面図である。これらの図では、本来外部から視認できない部位が、参考のため、部分的に点線で示されている。以下では、説明の便宜のため、特に断らない限り、図１の上下方向を「前後」と称し、左右方向を「左右」と称し、図２の上下方向を「上下」と称する。ただし、蓄電デバイス１の使用時の向きは、これに限定されない。 <1. Overall configuration of power storage device>
FIG. 1 shows a plan view of the power storage device 1 including the packaging container 10 according to the present embodiment. FIG. 2 is a sectional view taken along line II-II of FIG. In these figures, the parts that are originally invisible from the outside are partially shown by dotted lines for reference. Hereinafter, for convenience of explanation, unless otherwise specified, the vertical direction of FIG. 1 is referred to as "front and back", the horizontal direction is referred to as "left and right", and the vertical direction of FIG. 2 is referred to as "up and down". However, the orientation of the power storage device 1 when used is not limited to this.
　本実施形態の包装容器１０は、蓄電デバイス用途であり、容器本体１００の他、容器本体１００に取り付けられたタブ３００及びタブフィルム３１０を備える。容器本体１００の内部空間Ｓ１には、蓄電デバイス素子４００が収容される。 The packaging container 10 of the present embodiment is used as a power storage device, and includes a tab 300 and a tab film 310 attached to the container body 100 in addition to the container body 100. The power storage device element 400 is housed in the internal space S1 of the container body 100.
　容器本体１００は、包装材料１１０及び１２０から構成される。上下方向に直交する向きから視たときの容器本体１００の外周部においては、包装材料１１０及び１２０がヒートシールされ、互いに融着しており、これにより、周縁シール部１３０が形成されている。そして、この周縁シール部１３０により、外部空間から遮断された容器本体１００の内部空間Ｓ１が形成される。周縁シール部１３０は、上下方向に直交する向きから視て、容器本体１００の内部空間Ｓ１の周縁を画定する。なお、ここでいうヒートシールの態様には、熱源からの加熱溶着、超音波溶着等の態様が想定される。いずれにせよ、周縁シール部１３０とは、包装材料１１０及び１２０が融着され、一体化している部分を意味する。 The container body 100 is composed of packaging materials 110 and 120. The packaging materials 110 and 120 are heat-sealed and fused to each other on the outer peripheral portion of the container body 100 when viewed from a direction orthogonal to the vertical direction, whereby the peripheral edge sealing portion 130 is formed. Then, the peripheral space S1 of the container body 100 that is shielded from the external space is formed by the peripheral seal portion 130. The peripheral edge sealing portion 130 defines the peripheral edge of the internal space S1 of the container body 100 when viewed from a direction orthogonal to the vertical direction. As the mode of heat sealing referred to here, modes such as heat welding from a heat source and ultrasonic welding are assumed. In any case, the peripheral seal portion 130 means a portion where the packaging materials 110 and 120 are fused and integrated.
　包装材料１１０及び１２０は、例えば、樹脂成形品又はフィルムから構成される。ここでいう樹脂成形品とは、射出成型や圧空成形、真空成形、ブロー成形等の方法により製造することができ、意匠性や機能性を付与するためにインモールド成形を行ってもよい。樹脂の種類は、ポリオレフィン、ポリエステル、ナイロン、ＡＢＳ等とすることができる。また、ここでいうフィルムとは、例えば、インフレーション法やＴダイ法等の方法により製造することができるプラスチックフィルムや金属箔である。また、ここでいうフィルムは、延伸されたものであってもなくてもよく、単層のフィルムであっても積層フィルムであってもよい。また、ここでいう積層フィルムは、コーティング法により製造されてもよいし、複数枚のフィルムが接着剤等により接着されたものでもよいし、多層押出法により製造されてもよい。 The packaging materials 110 and 120 are made of, for example, a resin molded product or a film. The resin molded product referred to here can be manufactured by a method such as injection molding, compressed air molding, vacuum forming, blow molding, or the like, and in-mold molding may be performed in order to impart designability and functionality. The type of resin may be polyolefin, polyester, nylon, ABS, or the like. Further, the film referred to here is, for example, a plastic film or a metal foil that can be manufactured by a method such as an inflation method or a T-die method. Further, the film referred to here may or may not be stretched, and may be a single-layer film or a laminated film. Further, the laminated film referred to here may be produced by a coating method, a plurality of films bonded by an adhesive or the like, or may be produced by a multilayer extrusion method.
　以上のとおり、包装材料１１０及び１２０は様々に構成することができるが、本実施形態では、ラミネートフィルムから構成される。ラミネートフィルムは、基材層、バリア層及び熱融着性樹脂層を積層した積層体とすることができる。基材層は、包装材料１１０及び１２０の基材として機能し、典型的には、容器本体１００の最外層を形成し、絶縁性を有する樹脂層である。バリア層は、包装材料１１０及び１２０の強度向上の他、蓄電デバイス１内に水蒸気、酸素、光等が侵入することを防止する機能を有し、典型的には、アルミニウム等からなる金属層である。熱融着性樹脂層は、典型的には、ポリオレフィン等の熱融着可能な樹脂からなり、容器本体１００の最内層を形成する。 As described above, the packaging materials 110 and 120 can be variously composed, but in the present embodiment, they are composed of a laminated film. The laminated film can be a laminated body in which a base material layer, a barrier layer and a thermosetting resin layer are laminated. The base material layer functions as a base material for the packaging materials 110 and 120, and is typically a resin layer that forms the outermost layer of the container body 100 and has an insulating property. The barrier layer has a function of improving the strength of the packaging materials 110 and 120 and preventing water vapor, oxygen, light, etc. from entering the power storage device 1, and is typically a metal layer made of aluminum or the like. is there. The thermosetting resin layer is typically made of a thermosetting resin such as polyolefin, and forms the innermost layer of the container body 100.
　容器本体１００の形状は、特に限定されず、例えば、袋状（パウチ状）とすることができる。ここでいう袋状には、三方シールタイプ、四方シールタイプ、ピロータイプ、ガセットタイプ等が考えられる。ただし、本実施形態の容器本体１００は、図１及び図２のような形状を有する。すなわち、本実施形態の容器本体１００は、トレイ状に成形された包装材料１１０と、その上から重ね合わされたシート状の包装材料１２０とを、平面視における外周部分に沿ってヒートシールすることにより製造される。包装材料１１０は、平面視における外周部分に相当する角環状のフランジ部１１４と、フランジ部１１４の内縁に連続し、そこから下方に膨出する成形部１１２とを含む。フランジ部１１４と、これと対面する包装材料１２０の平面視における外周部分とは、一体化するようにヒートシールされ、周縁シール部１３０を構成する。周縁シール部１３０は、容器本体１００の外周全体に亘って延び、角環状に形成される。なお、包装材料１１０は、包装材料１２０と同様の形状であってもよいし、包装材料１２０が、包装材料１１０と同様の形状であってもよい。 The shape of the container body 100 is not particularly limited, and can be, for example, a bag shape (pouch shape). The bag shape referred to here may be a three-way seal type, a four-way seal type, a pillow type, a gusset type, or the like. However, the container body 100 of this embodiment has the shapes shown in FIGS. 1 and 2. That is, the container body 100 of the present embodiment heat-seals the tray-shaped packaging material 110 and the sheet-shaped packaging material 120 superposed on the tray-shaped packaging material 120 along the outer peripheral portion in a plan view. Manufactured. The packaging material 110 includes an annular flange portion 114 corresponding to an outer peripheral portion in a plan view, and a molding portion 112 that is continuous with the inner edge of the flange portion 114 and bulges downward from the flange portion 114. The flange portion 114 and the outer peripheral portion of the packaging material 120 facing the flange portion 114 in a plan view are heat-sealed so as to be integrated to form the peripheral edge seal portion 130. The peripheral edge seal portion 130 extends over the entire outer circumference of the container body 100 and is formed in an annular shape. The packaging material 110 may have the same shape as the packaging material 120, or the packaging material 120 may have the same shape as the packaging material 110.
　蓄電デバイス素子４００は、例えば、リチウムイオン電池（二次電池）やキャパシタ等の蓄電部材であり、電解液を含む。蓄電デバイス素子４００に異常が生じると、容器本体１００の内部空間Ｓ１内にガスが発生し得る。また、蓄電デバイス素子４００がキャパシタである場合には、キャパシタにおける化学反応に起因して容器本体１００の内部空間Ｓ１内にガスが発生し得る。なお、包装容器１０内には、一次電池及び二次電池のいずれが収容されてもよいが、好ましくは、二次電池が収容される。包装容器１０内に収容される二次電池の種類は、特に限定されず、例えば、リチウムイオン電池の他、リチウムイオンポリマー電池、全固体電池、鉛蓄電池、ニッケル・水素蓄電池、ニッケル・カドミウム蓄電池、ニッケル・鉄蓄電池、ニッケル・亜鉛蓄電池、酸化銀・亜鉛蓄電池、金属空気電池、多価カチオン電池、コンデンサー、キャパシタ等が挙げられる。 The power storage device element 400 is, for example, a power storage member such as a lithium ion battery (secondary battery) or a capacitor, and includes an electrolytic solution. When an abnormality occurs in the power storage device element 400, gas may be generated in the internal space S1 of the container body 100. Further, when the power storage device element 400 is a capacitor, gas may be generated in the internal space S1 of the container body 100 due to a chemical reaction in the capacitor. Either a primary battery or a secondary battery may be housed in the packaging container 10, but a secondary battery is preferably housed. The type of the secondary battery housed in the packaging container 10 is not particularly limited, and for example, in addition to the lithium ion battery, a lithium ion polymer battery, an all-solid-state battery, a lead storage battery, a nickel / hydrogen storage battery, a nickel / cadmium storage battery, etc. Examples thereof include nickel / iron storage batteries, nickel / zinc storage batteries, silver oxide / zinc storage batteries, metal air batteries, polyvalent cation batteries, capacitors, and capacitors.
　タブ３００は、蓄電デバイス素子４００における電力の入出力に用いられる金属端子である。タブ３００は、容器本体１００の左右方向の端部に分かれて配置されており、一方が正極側の端子を構成し、他方が負極側の端子を構成する。各タブ３００の左右方向の一方の端部は、容器本体１００の内部空間Ｓ１において蓄電デバイス素子４００の電極（正極又は負極）に電気的に接続されており、他方の端部は、周縁シール部１３０から外側に突出している。以上の蓄電デバイス１の形態は、例えば、蓄電デバイス１を多数直列接続して高電圧で使用する電気自動車やハイブリッド自動車等の電動車両で使用するのに特に好ましい。 The tab 300 is a metal terminal used for input / output of electric power in the power storage device element 400. The tabs 300 are separately arranged at the left and right ends of the container body 100, one of which constitutes a terminal on the positive electrode side and the other of which constitutes a terminal on the negative electrode side. One end of each tab 300 in the left-right direction is electrically connected to an electrode (positive electrode or negative electrode) of the power storage device element 400 in the internal space S1 of the container body 100, and the other end is a peripheral seal portion. It protrudes outward from 130. The above-described form of the power storage device 1 is particularly preferable for use in an electric vehicle such as an electric vehicle or a hybrid vehicle in which a large number of power storage devices 1 are connected in series and used at a high voltage.
　タブ３００を構成する金属材料は、例えば、アルミニウム、ニッケル、銅等である。蓄電デバイス素子４００がリチウムイオン電池である場合、正極に接続されるタブ３００は、典型的には、アルミニウム等によって構成され、負極に接続されるタブ３００は、典型的には、銅、ニッケル等によって構成される。 The metal material constituting the tab 300 is, for example, aluminum, nickel, copper, or the like. When the power storage device element 400 is a lithium ion battery, the tab 300 connected to the positive electrode is typically made of aluminum or the like, and the tab 300 connected to the negative electrode is typically copper, nickel or the like. Consists of.
　左側のタブ３００は、周縁シール部１３０のうち左端部において、タブフィルム３１０を介して包装材料１１０及び１２０に挟まれている。右側のタブ３００も、周縁シール部１３０のうち右端部において、タブフィルム３１０を介して包装材料１１０及び１２０に挟まれている。 The tab 300 on the left side is sandwiched between the packaging materials 110 and 120 via the tab film 310 at the left end portion of the peripheral seal portion 130. The tab 300 on the right side is also sandwiched between the packaging materials 110 and 120 via the tab film 310 at the right end portion of the peripheral sealing portion 130.
　タブフィルム３１０は、接着性フィルムであり、包装材料１１０及び１２０と、タブ３００（金属）との両方に接着するように構成されている。タブフィルム３１０を介することによって、タブ３００と、包装材料１１０及び１２０の最内層（熱融着性樹脂層）とが異素材であっても、両者を固定することができる。 The tab film 310 is an adhesive film and is configured to adhere to both the packaging materials 110 and 120 and the tab 300 (metal). By passing through the tab film 310, even if the tab 300 and the innermost layers (thermosetting resin layers) of the packaging materials 110 and 120 are different materials, both can be fixed.
　蓄電デバイス１の動作に伴い、容器本体１００の内部空間Ｓ１でガスが発生すると、内部空間Ｓ１内の圧力が徐々に上昇してゆく。内部空間Ｓ１内の圧力が過剰に上昇すると、容器本体１００が破裂し、蓄電デバイス１が破壊される虞がある。包装容器１０は、このような事態を防止するための機構として、弁構造体２００を備える。弁構造体２００は、内部空間Ｓ１内の圧力を調整するためのガス抜き弁であり、容器本体１００の周縁シール部１３０に取り付けられている。また、本実施形態の容器本体１００には、弁構造体２００のガス抜きの機能を維持するため、パターンシール部５００が形成されている。以下、弁構造体２００及びパターンシール部５００の構成について、詳細に説明する。 When gas is generated in the internal space S1 of the container body 100 with the operation of the power storage device 1, the pressure in the internal space S1 gradually increases. If the pressure in the internal space S1 rises excessively, the container body 100 may burst and the power storage device 1 may be destroyed. The packaging container 10 includes a valve structure 200 as a mechanism for preventing such a situation. The valve structure 200 is a gas vent valve for adjusting the pressure in the internal space S1, and is attached to the peripheral seal portion 130 of the container body 100. Further, the container body 100 of the present embodiment is formed with a pattern seal portion 500 in order to maintain the degassing function of the valve structure 200. Hereinafter, the configurations of the valve structure 200 and the pattern seal portion 500 will be described in detail.
　＜２．弁構造体の構成＞
　図３は、弁構造体２００の平面図である。図４は、図３のＩＶ－ＩＶ断面図であり、図５は、図３のＶ－Ｖ断面図である。図５に示す通り、本実施形態の弁構造体２００は、繰り返しのガス抜きが可能な逆止弁であり、特にボールスプリング型の逆止弁である。弁構造体２００は、内部空間Ｓ１内の圧力に応じて、開状態と閉状態との間を切り替わるリリーフ弁である。 <2. Structure of valve structure>
FIG. 3 is a plan view of the valve structure 200. FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, and FIG. 5 is a sectional view taken along line VV of FIG. As shown in FIG. 5, the valve structure 200 of the present embodiment is a check valve capable of repeatedly venting gas, and is particularly a ball spring type check valve. The valve structure 200 is a relief valve that switches between an open state and a closed state according to the pressure in the internal space S1.
　図３～図５に示すとおり、弁構造体２００は、弁機能部２１０及び取付部２２０を含む。取付部２２０は、弁構造体２００を容器本体１００に取り付けるための部位である。取付部２２０は、容器本体１００の成形時に、周縁シール部１３０を構成する包装材料１１０及び１２０に挟まれた状態でヒートシールされることにより、容器本体１００に固定される（図２参照）。このヒートシールにより、取付部２２０の外周面と、包装材料１１０及び１２０とは、融着して接合された状態となる。本実施形態では、弁機能部２１０は、周縁シール部１３０の外側に配置されており、包装材料１１０及び１２０に挟まれていない（図１及び図２参照）。その結果、容器本体１００に取付部２２０をヒートシールにより取り付ける時の熱で、弁機能部２１０を構成する各種部品が変形等により破壊される虞が低減される。 As shown in FIGS. 3 to 5, the valve structure 200 includes a valve function portion 210 and a mounting portion 220. The mounting portion 220 is a portion for mounting the valve structure 200 to the container body 100. When the container body 100 is molded, the mounting portion 220 is fixed to the container body 100 by being heat-sealed while being sandwiched between the packaging materials 110 and 120 constituting the peripheral seal portion 130 (see FIG. 2). By this heat seal, the outer peripheral surface of the mounting portion 220 and the packaging materials 110 and 120 are fused and joined. In the present embodiment, the valve function portion 210 is arranged outside the peripheral edge sealing portion 130 and is not sandwiched between the packaging materials 110 and 120 (see FIGS. 1 and 2). As a result, the heat generated when the mounting portion 220 is attached to the container body 100 by the heat seal reduces the possibility that various parts constituting the valve function portion 210 will be destroyed due to deformation or the like.
　取付部２２０は、包装材料１１０及び１２０の最内層と直に接着する材料から構成することが好ましい。例えば、取付部２２０は、包装材料１１０及び１２０の最内層と同じ熱融着性を備えた材料、例えば、ポリオレフィン等の樹脂から構成することができる。仮に耐熱性等の理由で、取付部２２０を以上のような材料で構成することができない場合、取付部２２０と包装材料１１０及び１２０の最内層との両方に接着可能なフィルムを介してこれらを接着することができる。 The mounting portion 220 is preferably composed of a material that directly adheres to the innermost layers of the packaging materials 110 and 120. For example, the mounting portion 220 can be made of a material having the same heat-sealing properties as the innermost layers of the packaging materials 110 and 120, for example, a resin such as polyolefin. If the mounting portion 220 cannot be made of the above materials due to heat resistance or the like, these can be attached via a film that can be adhered to both the mounting portion 220 and the innermost layers of the packaging materials 110 and 120. Can be glued.
　取付部２２０は、弁機能部２１０に接続されている。図４に示す通り、弁機能部２１０及び取付部２２０の外形は、各々、略円柱形状であり、互いに同軸である。ここで、両者の共通する中心軸を、参照符号Ｃ１で表す。中心軸Ｃ１は、前後方向に平行又は略平行に延びる。 The mounting portion 220 is connected to the valve function portion 210. As shown in FIG. 4, the outer shapes of the valve function portion 210 and the mounting portion 220 are each substantially cylindrical and coaxial with each other. Here, the central axis common to both is represented by reference numeral C1. The central axis C1 extends parallel to or substantially parallel to the front-rear direction.
　弁機能部２１０及び取付部２２０は、全体としてはいずれも筒状である。弁機能部２１０の内側空間と取付部２２０の内側空間とは、互いに連通しており、これにより、弁構造体２００の内部には、通路Ｌ１が形成される。通路Ｌ１は、中心軸Ｃ１方向に沿って延びる。通路Ｌ１は、容器本体１００の内部空間Ｓ１に面する入口Ｏ１と、外部空間に面する出口Ｏ２とを有する。よって、通路Ｌ１は、弁構造体２００の開状態において、内部空間Ｓ１を外部空間に連通させる。一方、弁構造体２００は、閉状態において、内部空間Ｓ１を外部空間から密閉する。弁構造体２００は、内部空間Ｓ１で発生したガスにより内部空間Ｓ１内の圧力が上昇した場合に、開状態となり、通路Ｌ１を介して当該ガスを外部空間に放出する。 The valve function portion 210 and the mounting portion 220 are both tubular as a whole. The inner space of the valve function portion 210 and the inner space of the attachment portion 220 communicate with each other, whereby a passage L1 is formed inside the valve structure 200. The passage L1 extends along the central axis C1 direction. The passage L1 has an inlet O1 facing the internal space S1 of the container body 100 and an outlet O2 facing the external space. Therefore, the passage L1 communicates the internal space S1 with the external space in the open state of the valve structure 200. On the other hand, the valve structure 200 seals the internal space S1 from the external space in the closed state. When the pressure in the internal space S1 rises due to the gas generated in the internal space S1, the valve structure 200 is opened and the gas is discharged to the external space through the passage L1.
　本実施形態では、弁機能部２１０は、筒体２１１と、Ｏリング２１２と、ボール２１４と、バネ２１６とを有する。筒体２１１と取付部２２０とは、一体的に構成することもできるし、別部品として製造した後、これらを接続することもできる。筒体２１１は、例えば、ステンレス等の金属製とすることもできるし、ポリオレフィン等の樹脂製とすることもできる。筒体２１１は、通路Ｌ１の一部としての内部空間を画定し、当該内部空間内に、Ｏリング２１２、ボール２１４及びバネ２１６が、中心軸Ｃ１方向の外側に向かってこの順に配置される。 In the present embodiment, the valve function unit 210 has a tubular body 211, an O-ring 212, a ball 214, and a spring 216. The tubular body 211 and the mounting portion 220 can be integrally configured, or can be manufactured as separate parts and then connected to each other. The tubular body 211 may be made of a metal such as stainless steel, or may be made of a resin such as polyolefin. The tubular body 211 defines an internal space as a part of the passage L1, and the O-ring 212, the ball 214, and the spring 216 are arranged in this order toward the outside in the central axis C1 direction in the internal space.
　筒体２１１は、弁座２１１ａを有する。弁座２１１ａは、筒体２１１の内部空間の一部として、外部空間に向かって拡径する逆円錐台型の空間を画定する。弁座２１１ａは、バネ２１６により外側から付勢される弁体としてのボール２１４を受け取り、このとき、弁構造体２００の閉状態が形成される。バネ２１６は、図５の例では、コイルばねであるが、これに限定されず、例えば、板バネとすることもできる。Ｏリング２１２は、弁座２１１ａに着座したときに、ボール２１４と弁座２１１ａとの隙間をなくし、閉状態の密閉性を高めるのを補助する。Ｏリング２１２は、中空円形のリングであり、例えば、フッ素ゴムにより構成される。ボール２１４及びバネ２１６の材質は特に限定されず、例えば、両者をステンレス等の金属製とすることができる。また、ボール２１４は、樹脂製としてもよいし、ゴム製としてもよい。 The tubular body 211 has a valve seat 211a. The valve seat 211a defines an inverted truncated cone-shaped space whose diameter increases toward the external space as a part of the internal space of the tubular body 211. The valve seat 211a receives the ball 214 as a valve body urged from the outside by the spring 216, and at this time, the closed state of the valve structure 200 is formed. The spring 216 is a coil spring in the example of FIG. 5, but the spring 216 is not limited to this, and may be, for example, a leaf spring. When seated on the valve seat 211a, the O-ring 212 eliminates the gap between the ball 214 and the valve seat 211a and assists in improving the airtightness in the closed state. The O-ring 212 is a hollow circular ring, and is made of, for example, fluororubber. The materials of the balls 214 and the springs 216 are not particularly limited, and for example, both may be made of metal such as stainless steel. Further, the ball 214 may be made of resin or rubber.
　取付部２２０の内部空間は、容器本体１００の内部空間Ｓ１に連通している。内部空間Ｓ１内の圧力、すなわち、取付部２２０の内部空間内の圧力が所定の圧力に達すると、内部空間Ｓ１から導かれたガスがボール２１４を図５の上方向に押圧する。ボール２１４が押圧され、弁座２１１ａから離れると、バネ２１６が変形して、ボール２１４が上方へ移動し、弁構造体２００の開状態が形成される。この開状態において、内部空間Ｓ１内で発生したガスは、ボール２１４とＯリング２１２との間に形成された隙間を介して弁機能部２１０内へ流れ出し、さらに出口Ｏ２を介して外部空間へ排出される。このようにして、内部空間Ｓ１内のガスが通路Ｌ１を介して排出されると、ボール２１４を図５の上方向に押圧する力が弱まり、これよりもバネ２１６がボール２１４を図５の下方向に付勢する力が大きくなる。その結果、バネ２１６の形状が復元し、再度、弁構造体２００の閉状態が形成される。 The internal space of the mounting portion 220 communicates with the internal space S1 of the container body 100. When the pressure in the internal space S1, that is, the pressure in the internal space of the mounting portion 220 reaches a predetermined pressure, the gas guided from the internal space S1 presses the ball 214 upward in FIG. When the ball 214 is pressed and separated from the valve seat 211a, the spring 216 is deformed and the ball 214 moves upward to form an open state of the valve structure 200. In this open state, the gas generated in the internal space S1 flows out into the valve function portion 210 through the gap formed between the ball 214 and the O-ring 212, and is further discharged to the external space through the outlet O2. Will be done. In this way, when the gas in the internal space S1 is discharged through the passage L1, the force for pressing the ball 214 upward in FIG. 5 weakens, and the spring 216 pushes the ball 214 below FIG. The force to urge in the direction increases. As a result, the shape of the spring 216 is restored, and the closed state of the valve structure 200 is formed again.
　弁構造体２００は、閉状態において、容器本体１００の内部空間Ｓ１内への大気の進入を防止することができる。一方、開状態においても、内部空間Ｓ１内への大気の進入は生じ難い。開状態においては、内部空間Ｓ１内の圧力が外部空間内の圧力よりも高い又は同等の状態が維持されるためである。よって、弁構造体２００は、容器本体１００内への大気の進入を効果的に防止し、これに含まれる水分による蓄電デバイス素子４００の劣化を防止することができる。 The valve structure 200 can prevent the entry of air into the internal space S1 of the container body 100 in the closed state. On the other hand, even in the open state, it is unlikely that the atmosphere will enter the internal space S1. This is because, in the open state, the pressure in the internal space S1 is maintained higher than or equivalent to the pressure in the external space. Therefore, the valve structure 200 can effectively prevent the entry of the atmosphere into the container body 100, and can prevent the power storage device element 400 from being deteriorated by the moisture contained therein.
　＜３．パターンシール部の構成＞
　以上のとおり、弁構造体２００は、容器本体１００の内部空間Ｓ１内の圧力の調整を行うガス抜き弁である。しかしながら、仮に内部空間Ｓ１に収容されている液体（主として、電解液）が、弁構造体２００内の通路Ｌ１に侵入すると、弁構造体２００のガス抜きの機能が損なわれることがある。このような液体から析出した塩や電解液成分等の固体が、通路Ｌ１を塞ぎ得るからである。以上の事態を防止するため、容器本体１００は、弁構造体２００の入口Ｏ１の周辺において、図１に斜線のハッチングで示されるパターンシール部５００を有する。 <3. Structure of pattern seal part>
As described above, the valve structure 200 is a gas vent valve that adjusts the pressure in the internal space S1 of the container body 100. However, if the liquid (mainly the electrolytic solution) contained in the internal space S1 enters the passage L1 in the valve structure 200, the degassing function of the valve structure 200 may be impaired. This is because a solid such as a salt or an electrolytic solution component precipitated from such a liquid can block the passage L1. In order to prevent the above situation, the container body 100 has a pattern seal portion 500 shown by hatching in a diagonal line in FIG. 1 around the inlet O1 of the valve structure 200.
　図６は、パターンシール部５００の周辺の拡大平面図である。図６中、ヒートシールがされているシール領域は、クロス線のハッチングで示されている。一方、図６中、ヒートシールがされていない非シール領域は、ハッチング及び塗りつぶしなしで示されている。なお、図６中、パターンシール部５００を示す一点鎖線の囲み線は、参考線であり、実際には視認されない。また、ここでいうパターンシール部とは、実質的に隙間なくシールがされているベタシール部ではなく、シール領域と非シール領域との組み合わせにより、全体として模様又は図柄を形成している領域を意味する。また、ヒートシールがされているシール領域とは、対面する包装材料１１０及び１２０が融着され、一体化している部分を意味する。 FIG. 6 is an enlarged plan view of the periphery of the pattern seal portion 500. In FIG. 6, the heat-sealed seal area is indicated by cross-line hatching. On the other hand, in FIG. 6, the unsealed area that is not heat-sealed is shown without hatching and filling. In FIG. 6, the enclosed line of the alternate long and short dash line indicating the pattern seal portion 500 is a reference line and is not actually visible. Further, the pattern seal portion referred to here does not mean a solid seal portion that is sealed substantially without gaps, but a region in which a pattern or a pattern is formed as a whole by combining a seal region and a non-seal region. To do. Further, the heat-sealed sealing region means a portion where the facing packaging materials 110 and 120 are fused and integrated.
　図６に示す通り、パターンシール部５００は、弁構造体２００の取付部２２０の入口Ｏ１を覆い囲むように配置される。従って、容器本体１００の内部空間Ｓ１内のガス及び液体は、パターンシール部５００を通り抜けることなく、弁構造体２００の入口Ｏ１に達することができない。なお、図６中、点線は、取付部２２０のうち、周縁シール部１３０に取り付けられている部分を示している。 As shown in FIG. 6, the pattern seal portion 500 is arranged so as to surround the inlet O1 of the attachment portion 220 of the valve structure 200. Therefore, the gas and the liquid in the internal space S1 of the container body 100 cannot reach the inlet O1 of the valve structure 200 without passing through the pattern seal portion 500. In FIG. 6, the dotted line indicates the portion of the mounting portion 220 that is attached to the peripheral seal portion 130.
　パターンシール部５００に含まれる非シール領域５２０は、分岐するように延びる複数の流路Ｌ２を形成し、パターンシール部５００に含まれるシール領域５１０は、これらの流路Ｌ２の壁面を画定する。これらの流路Ｌ２は、内部空間Ｓ１で発生したガスを入口Ｏ１まで導くように延びている。よって、これらの流路Ｌ２を介して、弁構造体２００内の通路Ｌ１は、内部空間Ｓ１の中央部（内部空間Ｓ１において流路Ｌ２により形成される空間を除く、パターンシール部５００よりも内側の空間）と連通している。 The non-seal region 520 included in the pattern seal portion 500 forms a plurality of flow paths L2 extending so as to branch, and the seal region 510 included in the pattern seal portion 500 defines the wall surface of these flow paths L2. These flow paths L2 extend so as to guide the gas generated in the internal space S1 to the inlet O1. Therefore, through these flow paths L2, the passage L1 in the valve structure 200 is inside the central portion of the internal space S1 (excluding the space formed by the flow path L2 in the internal space S1) and inside the pattern seal portion 500. It communicates with the space).
　シール領域５１０は、非シール領域５２０により形成される流路Ｌ２を分岐させるように配置される。よって、仮にパターンシール部５００が存在せず、これが占める領域全体が非シール領域である場合に比べて、弁構造体２００の入口Ｏ１の周辺において、内部空間Ｓ１の中央部から入口Ｏ１に達する流路が狭められる。このように分岐し、その断面積（管径）が狭められた流路Ｌ２の形状は、内部空間Ｓ１内の液体が流路Ｌ２を通過し、弁構造体２００の入口Ｏ１に達するまでの抵抗（配管抵抗）を増大させる。すなわち、シール領域５１０により画定される流路Ｌ２の壁面と、液体との間に作用する摩擦力が増大し、液体がパターンシール部５００に進入し難くなる。一方で、内部空間Ｓ１で発生したガスにとっても、以上のような流路Ｌ２の形状は、入口Ｏ１に達することの抵抗となり得る。しかし、ガスは一般に液体と比較して流動性が高いため、液体と比較すると流路Ｌ２を通過し易い。よって、パターンシール部５００は、十分なガスの透過を許容する一方で、液体の透過を抑制する。その結果、パターンシール部５００は、内部空間Ｓ１内のガスを安定的に弁構造体２００の通路Ｌ１内に導く一方で、内部空間Ｓ１内の液体が通路Ｌ１に侵入し、その機能を損なうことを抑制することができる。 The sealed region 510 is arranged so as to branch the flow path L2 formed by the non-sealed region 520. Therefore, as compared with the case where the pattern seal portion 500 does not exist and the entire region occupied by the pattern seal portion 500 is the non-seal region, the flow reaching the inlet O1 from the central portion of the internal space S1 around the inlet O1 of the valve structure 200. The road is narrowed. The shape of the flow path L2, which is branched in this way and whose cross-sectional area (pipe diameter) is narrowed, is the resistance until the liquid in the internal space S1 passes through the flow path L2 and reaches the inlet O1 of the valve structure 200. (Piping resistance) is increased. That is, the frictional force acting between the wall surface of the flow path L2 defined by the seal region 510 and the liquid increases, and it becomes difficult for the liquid to enter the pattern seal portion 500. On the other hand, even for the gas generated in the internal space S1, the shape of the flow path L2 as described above can be a resistance to reach the inlet O1. However, since the gas generally has a higher fluidity than the liquid, it easily passes through the flow path L2 as compared with the liquid. Therefore, the pattern seal portion 500 allows sufficient permeation of gas while suppressing permeation of liquid. As a result, the pattern seal portion 500 stably guides the gas in the internal space S1 into the passage L1 of the valve structure 200, while the liquid in the internal space S1 invades the passage L1 and impairs its function. Can be suppressed.
　図６に示す通り、本実施形態のパターンシール部５００は、左右方向に延びる細長いシール領域５１０を間欠的に配置したパターンを形成する。より具体的には、左右方向に延びる細長いシール領域５１０が、左右方向に間隔を開けて配置されるパターンが、前後方向に多段構成で配列される。なお、各段のパターンは、一致していても、相違していてもよい（ここでいう一致及び相違は、左右方向のずれは考慮せず、平行移動させたときに、パターンが重なることを一致、重ならないことを相違という）。シール領域５１０は、隣接する段において、互い違いに配置される。すなわち、ある段におけるシール領域５１０間の非シール領域５２０は、左右方向を基準として、これに隣接する段のシール領域５１０と重なる。これにより、パターンシール部５００内で流路Ｌ２は何度も折れ曲がり、シール領域５１０により形成される壁面とより多くの面積で接触することになる。よって、このような形状のパターンシール部５００は、液体の透過を効率的に抑制することができる。 As shown in FIG. 6, the pattern seal portion 500 of the present embodiment forms a pattern in which elongated seal regions 510 extending in the left-right direction are intermittently arranged. More specifically, patterns in which elongated seal regions 510 extending in the left-right direction are arranged at intervals in the left-right direction are arranged in a multi-stage configuration in the front-rear direction. It should be noted that the patterns of each stage may be the same or different (the matching and the difference here do not consider the deviation in the left-right direction, and the patterns overlap when they are translated. Matching and not overlapping is called difference). The seal regions 510 are staggered in adjacent steps. That is, the non-seal region 520 between the seal regions 510 in a certain stage overlaps with the seal region 510 in the adjacent stage with reference to the left-right direction. As a result, the flow path L2 is bent many times in the pattern seal portion 500 and comes into contact with the wall surface formed by the seal region 510 in a larger area. Therefore, the pattern seal portion 500 having such a shape can efficiently suppress the permeation of the liquid.
　また、図６に示す通り、周縁シール部１３０は、ベタシール部であり、取付部２２０とともに、パターンシール部５００を外側から囲んでいる。その結果、パターンシール部５００は、平面視において外部空間に接しておらず、流路Ｌ２から直接的に内部空間Ｓ１内のガス及び液体が外部に漏れることはない。 Further, as shown in FIG. 6, the peripheral seal portion 130 is a solid seal portion, and together with the mounting portion 220, surrounds the pattern seal portion 500 from the outside. As a result, the pattern seal portion 500 is not in contact with the external space in a plan view, and the gas and liquid in the internal space S1 do not leak directly from the flow path L2 to the outside.
　＜４．変形例＞
　以上、本発明の一実施形態について説明したが、本発明は上記実施形態に限定されるものではなく、その趣旨を逸脱しない限りにおいて、種々の変更が可能である。例えば、以下の変更が可能である。また、以下の変形例の要旨は、適宜組み合わせることができる。 <4. Modification example>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the following changes can be made. In addition, the gist of the following modified examples can be combined as appropriate.
　＜４－１＞
　上記実施形態の包装容器１０は、蓄電デバイス用として構成されたが、本発明に係る包装容器の用途はこれに限定されず、その内容物は特に限定されない。本発明に係る包装容器は、時間の経過に伴いガスを発生させるような内容物であって、弁構造体の通路内に入り込んだ場合に固化する等して通路を詰まらせる虞のある成分が含まれる液体を含む内容物を収容するのに優れる。 <4-1>
The packaging container 10 of the above embodiment is configured for a power storage device, but the use of the packaging container according to the present invention is not limited to this, and the contents thereof are not particularly limited. The packaging container according to the present invention has contents that generate gas with the passage of time, and contains components that may clog the passage such as solidifying when entering the passage of the valve structure. Excellent for accommodating contents containing liquids contained.
　＜４－２＞
　上記実施形態の弁構造体２００は、ボールスプリング型であったが、これに限定されず、例えば、ポペット型、ダックビル型、アンブレラ型、ダイヤフラム型等とすることができる。また、上記実施形態の弁構造体２００に含まれる弁体は、球状のボール２１４であったが、このような形状に限定されず、弁体としての機能を果たす限り、様々な形状を採用することができる。例えば、弁体は、半球状や長球状、扁球状であってもよい。弁体が半球状である場合、球面側が弁座２１１ａに受け取られ、球面と反対側の平らな面の中央部から、球面と反対側に柱状の部材が延びていてもよい。このとき、柱状の部材をバネ２１６の内側で受け取るように構成することにより、筒体２１１内での弁体の位置を安定させることができる。 <4-2>
The valve structure 200 of the above embodiment is a ball spring type, but is not limited to this, and may be, for example, a poppet type, a duck bill type, an umbrella type, a diaphragm type, or the like. Further, the valve body included in the valve structure 200 of the above embodiment is a spherical ball 214, but the shape is not limited to such a shape, and various shapes are adopted as long as the valve body functions as a valve body. be able to. For example, the valve body may be hemispherical, oblong, or oblate. When the valve body is hemispherical, the spherical side may be received by the valve seat 211a, and a columnar member may extend from the central portion of the flat surface on the opposite side to the spherical surface to the opposite side to the spherical surface. At this time, the position of the valve body in the tubular body 211 can be stabilized by configuring the columnar member so as to receive it inside the spring 216.
　また、上記実施形態の弁構造体２００は、繰り返しのガス抜きが可能な逆止弁であったが、１回限りのガス抜きが可能な破壊弁であってもよい。また、弁構造体２００に含まれる弁機構の数は特に限定されず、例えば、弁構造体２００は、逆止弁及び破壊弁の両方を含んでいてもよいし、複数の破壊弁を含んでいてもよいし、複数の逆止弁を含んでいてもよい。 Further, the valve structure 200 of the above embodiment is a check valve capable of repeatedly degassing, but may be a destructive valve capable of degassing only once. The number of valve mechanisms included in the valve structure 200 is not particularly limited. For example, the valve structure 200 may include both a check valve and a break valve, and includes a plurality of break valves. It may be included, or may include a plurality of check valves.
　本変形例でいう破壊弁は、様々に構成することができる。例えば、図７Ａに示すように、弁構造体２００内の通路Ｌ１を閉塞するように配置される薄板又はフィルム２５０により、破壊弁を構成することができる。この破壊弁（これ以降、破壊弁に、参照符号２５０を付す）は、例えば、出口Ｏ２を覆うように筒体２１１にラミネートフィルムをヒートシールにより取り付けることで、構成することができる。この例では、容器本体１００の内部空間Ｓ１内の圧力が上昇すると、破壊弁２５０であるラミネートフィルムが剥離することにより開弁する。別の例を挙げると、破壊弁２５０をアルミニウム等の金属製の薄板とし、図７Ｂに示すように、同薄板にその中心付近から放射状に延びる切欠き部２５１を形成してもよい。切欠き部２５１は、破壊弁２５０を厚み方向に貫通しておらず、他の部位に比べて薄く形成されている。この場合、破壊弁２５０は、容器本体１００の内部空間Ｓ１内の圧力が上昇すると、破壊弁２５０が筒体２１１から脱落するのではなく、破壊弁２５０が破断することにより開弁し得る。 The break valve referred to in this modification can be configured in various ways. For example, as shown in FIG. 7A, the break valve can be constructed by a thin plate or film 250 arranged so as to block the passage L1 in the valve structure 200. This breaking valve (hereinafter, the breaking valve is designated by the reference numeral 250) can be configured, for example, by attaching a laminate film to the cylinder 211 by heat sealing so as to cover the outlet O2. In this example, when the pressure in the internal space S1 of the container body 100 rises, the laminated film, which is the breaking valve 250, is peeled off to open the valve. As another example, the breaking valve 250 may be a thin plate made of metal such as aluminum, and as shown in FIG. 7B, a notch 251 extending radially from the vicinity of the center thereof may be formed in the thin plate. The notch portion 251 does not penetrate the break valve 250 in the thickness direction, and is formed thinner than other portions. In this case, when the pressure in the internal space S1 of the container body 100 rises, the breaking valve 250 can be opened by breaking the breaking valve 250 instead of dropping it from the cylinder 211.
　＜４－３＞
　パターンシール部５００により形成されるパターンは、上記実施形態で説明されたものに限定されない。例えば、図８Ａに示すように、十字型のシール領域５１０Ａを間隔を開けながら配列することにより、パターンシール部５００を形成してもよい。また、図８Ｂに示すように、パターンシール部５００は、１つの連続したシール領域５１０Ｂのみを有していてもよい。この場合も、流路Ｌ２は分岐し、パターンシール部５００は、液体の透過を抑制することができる。その他、パターンシール部５００に含まれるシール領域は、円形、正方形、星型等、任意の形状とすることができる。 <4-3>
The pattern formed by the pattern seal portion 500 is not limited to that described in the above embodiment. For example, as shown in FIG. 8A, the pattern seal portion 500 may be formed by arranging the cross-shaped seal regions 510A at intervals. Further, as shown in FIG. 8B, the pattern seal portion 500 may have only one continuous seal region 510B. Also in this case, the flow path L2 is branched, and the pattern seal portion 500 can suppress the permeation of the liquid. In addition, the seal region included in the pattern seal portion 500 can have any shape such as a circle, a square, and a star shape.
　＜４－４＞
　容器本体１００におけるパターンシール部５００の配置は、上記実施形態のように、弁構造体２００の入口Ｏ１周辺のみに限定されない。例えば、図９Ａに示すように、周縁シール部１３０の内側の端部全周に沿って、周縁シール部１３０に隣接する位置に、パターンシール部５００Ａを形成してもよい。別の例を挙げると、図９Ｂに示すように、周縁シール部１３０において弁構造体２００が取り付けられる辺全体に沿って、周縁シール部１３０に隣接する位置に、パターンシール部５００Ｂを形成してもよい。 <4-4>
The arrangement of the pattern seal portion 500 in the container body 100 is not limited to the vicinity of the inlet O1 of the valve structure 200 as in the above embodiment. For example, as shown in FIG. 9A, the pattern seal portion 500A may be formed at a position adjacent to the peripheral seal portion 130 along the entire circumference of the inner end portion of the peripheral seal portion 130. As another example, as shown in FIG. 9B, a pattern seal portion 500B is formed in the peripheral seal portion 130 at a position adjacent to the peripheral seal portion 130 along the entire side to which the valve structure 200 is attached. May be good.
　＜４－５＞
　図１０に示すようなパターンシール部５００も考えられる。すなわち、上記した図６、図８Ａ及び図８Ｂの態様では、流路Ｌ２の分岐点は、弁構造体２００の入口Ｏ１周辺に位置していたが、図１０に示すように、シール領域５１０Ｃの断絶により形成される流路Ｌ２の分岐点が、弁構造体２００の入口Ｏ１の周辺から離れた位置に配置されてもよい。 <4-5>
A pattern seal portion 500 as shown in FIG. 10 is also conceivable. That is, in the above-described aspects of FIGS. 6, 8A and 8B, the branch point of the flow path L2 was located around the inlet O1 of the valve structure 200, but as shown in FIG. 10, the seal region 510C The branch point of the flow path L2 formed by the disconnection may be arranged at a position away from the periphery of the inlet O1 of the valve structure 200.
　＜４－６＞
　上記実施形態において、容器本体１００への弁構造体２００の固定を容易にし、その固定の強度を向上させるべく、弁構造体２００の取付部２２０と容器本体１００の周縁シール部１３０との間に接着性部材を介在させてもよい。 <4-6>
In the above embodiment, in order to facilitate the fixing of the valve structure 200 to the container body 100 and improve the fixing strength, between the attachment portion 220 of the valve structure 200 and the peripheral seal portion 130 of the container body 100. An adhesive member may be interposed.
　接着性部材は、弁構造体２００の取付部２２０と、周縁シール部１３０を構成する包装材料１１０及び１２０との両方に対し接着性を有する部材であり、例えば、図１１及び図１２に示すような接着性フィルム６００として構成することができる。図１１は、弁構造体２００の取付部２２０の周辺の拡大平面図であり、図１２は、そのＸＩＩ－ＸＩＩ線断面図である。取付部２２０は、接着性フィルム６００を介して包装材料１１０及び１２０に挟まれる。このように接着性フィルム６００を介することによって、仮に取付部２２０の外面と、包装材料１１０及び１２０の最内層（熱融着性樹脂層）とが異素材であっても、両者を強固に固定することができる。なお、本来であれば、図１１において、接着性フィルム６００の包装材料１１０及び１２０に挟まれている部分は視認できないが、同図では参考のため、同部分の位置が点線で示されている。 The adhesive member is a member having adhesiveness to both the mounting portion 220 of the valve structure 200 and the packaging materials 110 and 120 constituting the peripheral seal portion 130, and is, for example, as shown in FIGS. 11 and 12. It can be configured as an adhesive film 600. FIG. 11 is an enlarged plan view of the periphery of the mounting portion 220 of the valve structure 200, and FIG. 12 is a sectional view taken along line XII-XII thereof. The mounting portion 220 is sandwiched between the packaging materials 110 and 120 via the adhesive film 600. By using the adhesive film 600 in this way, even if the outer surface of the mounting portion 220 and the innermost layers (thermosetting resin layers) of the packaging materials 110 and 120 are different materials, both are firmly fixed. can do. Originally, in FIG. 11, the portion of the adhesive film 600 sandwiched between the packaging materials 110 and 120 cannot be visually recognized, but in the same figure, the position of the portion is indicated by a dotted line for reference. ..
　接着性フィルム６００は、取付部２２０とともに、容器本体１００の成形時に、周縁シール部１３０を構成する包装材料１１０及び１２０に挟まれた状態でヒートシールされる。このヒートシールにより、取付部２２０の外面と接着性フィルム６００の最内層とが融着して接合され、包装材料１１０及び１２０の最内層と接着性フィルム６００の最外層とが、融着して接合される。 The adhesive film 600 is heat-sealed together with the mounting portion 220 while being sandwiched between the packaging materials 110 and 120 constituting the peripheral seal portion 130 when the container body 100 is molded. By this heat seal, the outer surface of the mounting portion 220 and the innermost layer of the adhesive film 600 are fused and joined, and the innermost layers of the packaging materials 110 and 120 and the outermost layer of the adhesive film 600 are fused. Be joined.
　接着性フィルム６００の最内層は、取付部２２０と容易に接着する材料から構成されることが好ましい。同様に、接着性フィルム６００の最外層は、包装材料１１０及び１２０の最内層と容易に接着する材料から構成されることが好ましい。一例として、接着性フィルム６００は、無水マレイン酸変性ポリプロピレン（ＰＰａ）の単層フィルムであってもよい。ただし、接着性フィルム６００は、最内層と最外層との間に芯材を有する三層構造又は三層以上の構造の積層フィルムとすることが好ましい。この場合、接着性フィルム６００は、例えば、ＰＰａ、芯材としてのポリエチレンナフタレート（ＰＥＮ）及びＰＰａの積層フィルムであってもよいし、ＰＰａ、芯材としてのポリプロピレン（ＰＰ）、ＰＰａの積層フィルムであってもよい。その他、芯材としては、ポリエステル繊維やポリアミド繊維、カーボン繊維等も好ましく使用することができる。また、上記の例においてＰＰａ樹脂に代えて、アイオノマー樹脂、変性ポリエチレン、ＥＶＡ等の金属に接着可能な樹脂も適用可能である。 The innermost layer of the adhesive film 600 is preferably composed of a material that easily adheres to the mounting portion 220. Similarly, the outermost layer of the adhesive film 600 is preferably composed of a material that easily adheres to the innermost layers of the packaging materials 110 and 120. As an example, the adhesive film 600 may be a single-layer film of maleic anhydride-modified polypropylene (PPa). However, the adhesive film 600 is preferably a laminated film having a three-layer structure or a three-layer or more structure having a core material between the innermost layer and the outermost layer. In this case, the adhesive film 600 may be, for example, a laminated film of PPa, polyethylene naphthalate (PEN) as a core material, and PPa, or a laminated film of PPa, polypropylene (PP) as a core material, and PPa. It may be. In addition, as the core material, polyester fiber, polyamide fiber, carbon fiber and the like can also be preferably used. Further, in the above example, instead of the PPa resin, a resin that can be adhered to a metal such as an ionomer resin, modified polyethylene, and EVA can also be applied.
１　蓄電デバイス
１０　包装容器
１００　容器本体
１３０　周縁シール部
２００　弁構造体
４００　蓄電デバイス素子
５００、５００Ａ、５００Ｂ　パターンシール部
５１０、５１０Ａ、５１０Ｂ、５１０Ｃ　シール領域
５２０　非シール領域
Ｌ１　通路
Ｌ２　流路
Ｏ１　入口
Ｏ２　出口
Ｓ１　内部空間 1 Power storage device 10 Packaging container 100 Container body 130 Peripheral seal part 200 Valve structure 400 Power storage device element 500, 500A, 500B Pattern seal part 510, 510A, 510B, 510C Seal area 520 Non-seal area L1 Passage L2 Flow path O1 Inlet O2 Exit S1 internal space

Claims (9)

  1. 　包装材料で構成されており、内部空間の周縁を画定する周縁シール部を有する容器本体と、
    　前記周縁シール部に取り付けられ、前記内部空間を外部空間に連通させる通路を有し、前記内部空間で発生したガスにより前記内部空間の圧力が上昇した場合に、前記通路を介して当該ガスを放出する弁構造体と
    を備え、
    　前記通路は、前記内部空間に面する入口及び前記外部空間に面する出口を有し、
    　前記容器本体は、シール領域及び非シール領域を含むパターンシール部をさらに有し、
    　前記非シール領域は、前記内部空間で発生した前記ガスを前記入口まで導く複数の流路を形成し、
    　前記シール領域は、前記複数の流路の壁面を画定する、
    包装容器。     A container body that is made of packaging material and has a peripheral seal that defines the peripheral edge of the interior space.
    It is attached to the peripheral seal portion and has a passage for communicating the internal space with the external space, and when the pressure in the internal space rises due to the gas generated in the internal space, the gas is released through the passage. With a valve structure to
    The passage has an entrance facing the interior space and an exit facing the exterior space.
    The container body further has a pattern seal portion including a sealed region and a non-sealed region.
    The unsealed region forms a plurality of flow paths that guide the gas generated in the internal space to the inlet.
    The seal region defines the wall surface of the plurality of flow paths.
    Packaging container.
  2. 　前記パターンシール部は、少なくとも前記入口の周辺に形成される、
    請求項１に記載の包装容器。     The pattern seal portion is formed at least around the entrance.
    The packaging container according to claim 1.
  3. 　前記パターンシール部は、前記外部空間に接していない、
    請求項１又は２に記載の包装容器。     The pattern seal portion is not in contact with the external space.
    The packaging container according to claim 1 or 2.
  4. 　前記パターンシール部は、前記入口を囲むように配置される、
    請求項１から３のいずれかに記載の包装容器。     The pattern seal portion is arranged so as to surround the entrance.
    The packaging container according to any one of claims 1 to 3.
  5. 　前記弁構造体は、逆止弁を含む、
    請求項１から４のいずれかに記載の包装容器。     The valve structure includes a check valve.
    The packaging container according to any one of claims 1 to 4.
  6. 　前記弁構造体は、破壊弁を含む、
    請求項１から５のいずれかに記載の包装容器。     The valve structure includes a breaking valve.
    The packaging container according to any one of claims 1 to 5.
  7. 　前記包装材料は、ラミネートフィルムから構成される、
    請求項１から６のいずれかに記載の包装容器。     The packaging material is composed of a laminated film.
    The packaging container according to any one of claims 1 to 6.
  8. 　前記弁構造体の外面に接着され、かつ、前記周縁シール部に接着される接着性部材
    をさらに備える、
    請求項１から７のいずれかに記載の包装容器。     An adhesive member that is adhered to the outer surface of the valve structure and is adhered to the peripheral seal portion is further provided.
    The packaging container according to any one of claims 1 to 7.
  9. 　請求項１から８のいずれかに記載の包装容器と、
    　前記内部空間に収容される蓄電デバイス素子と
    を備える、蓄電デバイス。     The packaging container according to any one of claims 1 to 8 and
    A power storage device including a power storage device element housed in the internal space.
PCT/JP2020/010965 2019-03-12 2020-03-12 Packaging container and storage device WO2020184689A1 (en)

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Citations (8)

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JPS59207558A (en) * 1983-05-11 1984-11-24 Matsushita Electric Ind Co Ltd Manufacture of closed lead-acid battery
JPH0613060A (en) * 1992-06-29 1994-01-21 Shin Kobe Electric Mach Co Ltd Thin type sealed storage battery
JPH11240579A (en) * 1998-02-25 1999-09-07 Nidaiki Kk Degasifying functional film provided in bag or container
JP2006040626A (en) * 2004-07-23 2006-02-09 Toyota Motor Corp Sealed secondary battery
JP2007134535A (en) * 2005-11-11 2007-05-31 Mitsubishi Electric Corp Power storage device, power storage module, and gas storing bag used therefor
JP2010277907A (en) * 2009-05-29 2010-12-09 Nissan Motor Co Ltd Secondary battery and manufacturing method of the secondary battery
JP2016031934A (en) * 2014-07-29 2016-03-07 エスケー イノベーション カンパニー リミテッドＳｋ Ｉｎｎｏｖａｔｉｏｎ Ｃｏ．，Ｌｔｄ． Venting system of pouch type lithium secondary battery
JP2016219387A (en) * 2015-05-26 2016-12-22 日本電気株式会社 Secondary battery

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59207558A (en) * 1983-05-11 1984-11-24 Matsushita Electric Ind Co Ltd Manufacture of closed lead-acid battery
JPH0613060A (en) * 1992-06-29 1994-01-21 Shin Kobe Electric Mach Co Ltd Thin type sealed storage battery
JPH11240579A (en) * 1998-02-25 1999-09-07 Nidaiki Kk Degasifying functional film provided in bag or container
JP2006040626A (en) * 2004-07-23 2006-02-09 Toyota Motor Corp Sealed secondary battery
JP2007134535A (en) * 2005-11-11 2007-05-31 Mitsubishi Electric Corp Power storage device, power storage module, and gas storing bag used therefor
JP2010277907A (en) * 2009-05-29 2010-12-09 Nissan Motor Co Ltd Secondary battery and manufacturing method of the secondary battery
JP2016031934A (en) * 2014-07-29 2016-03-07 エスケー イノベーション カンパニー リミテッドＳｋ Ｉｎｎｏｖａｔｉｏｎ Ｃｏ．，Ｌｔｄ． Venting system of pouch type lithium secondary battery
JP2016219387A (en) * 2015-05-26 2016-12-22 日本電気株式会社 Secondary battery

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