TW201736117A - Laminated packing material having a metal foil, an insulating layer, a heat-sealable resin layer, and a protective layer to be thin and achieving no reduced formability - Google Patents

Abstract

The laminated packing material 1 of the present invention is characterized in having a metal foil 11, an insulating layer 14, a heat-sealable resin layer 15, and a protective layer 16. The insulating layer 14 is laminated on at least a portion of the region on the first surface of the metal foil 11. The heat-sealable resin layer 15 is laminated on the first surface side of the metal foil 11 with the insulating layer 14. The protective layer 16 is laminated on the heat-sealable resin layer 15, and is made of a resin film which is peelable from the heat-sealable resin layer 15. Further, the heat-sealable resin layer 15 is divided into at least an easy-to-peel portion 21 and a non-peel portion 22. The easy-to-peel portion 21 is surrounded by a cutting line 20 formed by cutting the heat-sealable resin layer 15. The non-peel portion 22 is disposed around the easy-to-peel portion 21 and not surrounded by the cutting line 20, and is set to region where the easy-to-peel portion 21 is superimposed on the insulating layer 14.

Description

Laminated packaging

The present invention relates to a laminated packaging material for a container for a power storage device, a container for food or the like, and the like, and a related art thereof.

The laminated packaging material is generally formed on one side of the metal foil to form an inner layer of the container and is adhered to the heat-sealed heat-sealable resin film with an adhesive, and the outer side layer is formed on the other side of the package. Next, a laminate of five layers of a heat resistant resin film is bonded (see Patent Document 1). These laminated packaging materials are used for removing a bag used for a flat sheet, and applying embossing to a flat sheet as a container having a three-dimensional storage space.

In recent years, the thickness of the portable device such as a smart phone or a touch panel terminal has been reduced, and the thickness of the laminated package used as a lithium ion battery or a lithium polymer battery is also required. Thin and light. A method of thinning the thickness of a laminated packaging material is a method of thinning the material of each layer.

However, when the thickness of each layer is reduced, the strength of the laminated packaging material is lowered, and the pinhole is generated, and the barrier property and the moldability are lowered, and the formation of the deep embossed portion is difficult.

Further, as a method of thinning the exterior body, the exterior body is formed of a packaging material having no heat-fusible resin layer, and a heat-melting tree for heat sealing which is separately produced is interposed between the peripheral portions. The method of fat body. According to this method, the heat-fusible resin only has the periphery of the exterior body, and the other regions can reduce the thickness of the heat-melting resin layer (see Patent Documents 2 and 3).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2005-22336

[Patent Document 2] Japanese Patent No. 5256990

[Patent Document 3] Japanese Patent No. 4354152

However, the package material having no heat-melting resin layer has poor moldability, and there is a fear of occurrence of flaws or cracks during embossing, and formation of a deep embossed portion is difficult. In addition, the number of components to be assembled is increased by the use of the heat-fusible resin body for heat sealing, and the position of the packaging material and the heat-meltable resin body needs to be blended to deteriorate the workability.

The present invention has been made in view of the above prior art, and it is an object of the invention to provide a laminated packaging material which does not reduce formability and which is thinned, and a related art thereof.

That is, the present invention has the constitutions described in the following [1] to [7].

[1] A laminated packaging material characterized by having: a metal foil; an insulating layer laminated to at least a portion of the first surface of the metal foil; a heat-melting resin layer laminated on the first side of the metal foil containing the insulating layer; and protection a layer laminated on the heat-fusible resin layer and composed of a resin film peelable to the heat-fusible resin layer; and the heat-fusible resin layer is divided into at least one easily peelable portion and non- The peeling portion is surrounded by a cut line formed by cutting the heat-fusible resin layer, and the non-peeling portion is disposed around the easily peelable portion and is not surrounded by the cut line, and at least the easy peeling portion is provided for insulation The area where the layers overlap.

[2] The laminated packaging material according to the above-mentioned item 1, wherein the adhesion force f1 between the insulating layer and the heat-fusible resin layer, and the adhesion force f2 between the protective layer and the heat-fusible resin layer are as described above. The adhesion force f3 between the metal foil and the insulating layer is such that the adhesion force f4 between the metal foil and the heat-fusible resin layer satisfies the relationship of f3>f2>f1 and f4>f2>f1.

[3] The laminated packaging material according to the above aspect, wherein the metal foil and the heat-fusible resin layer are laminated via an adhesive layer, and the metal foil and the insulating layer are laminated via an adhesive layer, and the insulating layer The layer of the heat-fusible resin is laminated without passing through the adhesive layer.

[4] The laminated packaging material according to the above item 1, wherein the surface of the protective layer has a dynamic friction coefficient of 1.0 or less.

[5] The laminated packaging material according to the above item 1, which has a plurality of easily peelable portions.

[6] The laminated packaging material according to the above item 1, wherein the protective layer is provided on the side of the protective layer There is a embossed portion of the depression, and the easily peelable portion exists in the embossed portion.

[7] A method of producing a power storage device, characterized in that the protective layer of the laminated packaging material according to any one of the above items 1 to 6 and the easily peelable layer of the heat-meltable resin layer are removed, and the insulating layer is exposed. The exposed insulating layer faces the container in the storage chamber instead of the peeling portion, and a power storage device is inserted into the storage chamber of the container, and the non-peeling portion of the container is heat-sealed and sealed in the storage device in the storage chamber.

According to the laminated packaging material according to the above [1], since the protective layer is laminated on the heat-fusible resin, high moldability is obtained, and a deep embossed portion can be formed. In addition, defects or chemicals in the formation can be prevented by the protective layer. Further, when the protective layer is pulled, the protective layer in the non-peeling portion of the heat-fusible resin layer is peeled off from the heat-melting resin, and the easily peelable portion cut by the cut line is peeled off from the insulating layer, and the protective layer and the resin layer are easily removed. The peeling portion forms a state in which the non-peeling portion of the heat-fusible resin layer remains around the insulating layer. The constituent member of the container is heat-sealed in the non-peeling portion by using the packaging material from which the protective layer and the easily peelable layer are removed, so that the inner surface of the container is insulated by the insulating layer.

In view of the above, high formability is achieved, and the thickness of the packaging material and the weight reduction are reduced by the removal of the protective layer and the easily peelable portion, and the product of the packaging material as a container can be made thinner and lighter.

According to the laminated packaging material according to the above [2], the easy-peeling portion of the protective layer and the heat-fusible resin layer can be easily removed by setting the bonding force between the layers.

The laminated packaging material according to the above [3], a metal foil and a heat-melting resin, The metal foil and the insulating layer are bonded together by a strong adhesive force through the adhesive layer, and the insulating layer and the heat-melting resin layer are laminated without interposing the adhesive layer, so that the easily peelable portion on the insulating layer can be easily peeled off. .

According to the laminated packaging material according to the above [4], since the smoothness of the forming tool is good on the surface of the protective layer, a deep embossed portion can be formed.

According to the laminated packaging material according to the above [5], since the plurality of easily peelable portions are provided, the production efficiency is good.

According to the laminated packaging material according to the above [6], since the embossed portion is provided, it is useful as a container material for enlarging the internal volume.

According to the method for producing a power storage device according to the above [7], the container is produced by removing the packaging material of the protective layer and the easily peelable portion of the heat-fusible resin layer, thereby achieving thinning and weight reduction. In particular, in the case where the container is formed of the packaging material having the embossed portion, the molding is performed in a state in which the protective layer and the heat-melting resin layer are easily peeled off, so that a deep embossed portion can be formed.

1, 2, 3, 4‧‧‧ laminated packaging materials

5‧‧‧Power storage device

11‧‧‧metal foil

12‧‧‧ adhesive layer

13‧‧‧Heat resistant resin layer

14‧‧‧Insulation

15‧‧‧Hot melt resin layer

16‧‧‧Protective layer

20‧‧‧Cut line

21‧‧‧Easy stripping department

22‧‧‧ Non-peeling department

30‧‧‧ embossed department

40‧‧‧ Container

43‧‧‧ Storage room

50‧‧‧Power storage device body

Fig. 1A is a plan view showing an embodiment of a laminated packaging material of the present invention.

Fig. 1B is a cross-sectional view taken along line 1B-1B of Fig. 1A.

Fig. 2 is a cross-sectional view showing another embodiment of the laminated packaging material of the present invention.

Fig. 3 is a cross-sectional view showing still another embodiment of the laminated packaging material of the present invention.

Fig. 4 is a cross-sectional view showing a laminated package having an embossed portion.

Fig. 5 is a perspective view showing an embodiment of a power storage device using the laminated packaging material of the present invention.

[Laminated packaging material]

The laminated packaging material 1 of FIG. 1A and FIG. 1B is formed on the first surface side of the metal foil 11, and the insulating layer 14 is laminated at the center portion, and the heat-melting resin layer 15 is laminated over the entire region including the insulating layer 14. Further, a protective layer 16 composed of a resin film peelable from the heat-fusible resin layer 15 is further laminated. The second surface of the metal foil 11 is bonded to the heat-resistant resin layer 13 in which the outer layer of the container is formed by laminating the adhesive layer 12.

In the heat-fusible resin layer 15, the region where the insulating layer 14 overlaps is formed with the easily peelable portion 21 surrounded by the cut line 20, and the peripheral region of the easily peelable portion 21 forms the non-peeling portion 22 which is not surrounded by the cut line. The cut line 20 is connected to the slit of the heat-fusible resin layer 15 in a dot-like connection. With the cut line 20, the easily peelable portion 21 is intermittently connected as a part of the heat-fusible resin layer 15, and the cut portion of the hole-shaped wiring provides an opportunity to easily cut away.

In the above-mentioned laminated packaging material 1, since the protective layer 16 is peelable to the heat-fusible resin layer 15, and the heat-fusible resin layer 15 is separable by the cut-out line 20, if the protective layer 16 is pulled, the protective layer in the non-peeling portion 22 16 is peeled off from the heat-fusible resin layer 15, and the heat-fusible resin layer 15 in the easily peelable portion 21 is cut along the cutting line 20, and the separated heat-melting resin layer 15 is adhered to the protective layer 16 together with the protective layer 16. Stripped from the insulating layer 14. By this peeling, the laminated packaging material 1 exposes the insulating layer 14, and the non-peeling portion 22 of the heat-fusible resin layer 15 remains in the state around the exposed insulating layer 14. The exposed insulating layer 14 forms the inner surface of the container, and the surrounding non-peeling portion 22 forms a heat seal portion of the container. Since the non-peeling portion 22 is integrated with the packaging material, it is not necessary to assemble a resin for heat sealing or the like, and the container can be easily assembled.

In the peeling operation, the protective layer 16 of the easily peelable portion 21 is peeled off from the heat-fusible resin layer 15, and the peelable portion 21 may be removed after the protective layer 16 is peeled off. Since the easily peelable portion 21 is surrounded by the cut-out line 20, the pull-away portion 21 can be peeled off from the insulating layer 14.

In the laminated packaging material 1, the bonding strength between the layers on the first surface side of the metal foil 11 of the laminated packaging material 1 is not the same and relatively strong, and the adhesion of the finally removed layer and the portion is set to be weak. The best. The insulating layer 14 is a layer in which the entire region is followed by the metal foil 11 not removed. The heat-fusible resin layer 15 is removed in the easily peelable portion 21, and is not removed in the non-peeling portion 22. The protective layer 16 is removed from the entire area. Therefore, the adhesion between the insulating layer 14 and the heat-fusible resin layer 15 is f1, and the adhesion between the protective layer 16 and the heat-fusible resin layer 15 is f2, and the metal foil 11 and the insulating layer 14 are provided. When the adhesion between the metal foil 11 and the heat-fusible resin layer 15 is f4, the relationship of f3>f2>f1 and f4>f2>f1 is preferable. When the adhesion forces f1, f2, f3, and f4 between the respective layers satisfy the above relationship, the protective layer 16 and the easily peelable portion 21 can be smoothly removed by pulling the protective layer 16. Further, since the easily peelable portion 21 is adhered to the protective layer 16 from the insulating layer 14 by f2 > f1, the easily peelable portion 21 can be removed only by pulling the protective layer 16.

The heat-fusible resin layer 15 is a layer which is used for sealing the packaging containers so as to face each other by heat sealing, and therefore is an essential layer in the peripheral portion of the container. On the other hand, the inner surface of the container must have electrical insulation, and the metal foil 11 must be covered with an insulator. In order to form a heat seal portion having a high airtightness, it is necessary to have a predetermined thickness which is thicker than a thickness required for electrical insulation. In addition, the laminated packaging material 1 is formed in order to form a deeper embossed portion. It is preferable that the resin layer is coated with a ductility to improve the formability, and the thickness of the resin layer for improving the formability is also thicker than the thickness required for obtaining electrical insulation. Further, it is preferable to prevent the contact with the forming tool from being prevented during the molding, and to prevent the corrosion of the drug from adhering, and to protect the heat-fusible resin layer 15 from the protective layer 16.

The laminated packaging material 1 is formed by embossing the embossed portion in a state in which the protective layer 16 is attached, thereby obtaining a high formability and forming a deep embossed portion, and removing the protective layer during use of the packaging container. 16 and the easily peelable portion 21 of the heat-fusible resin layer 15 can be made thinner and lighter.

[Other laminated forms of laminated packaging materials]

The laminated packaging material of the present invention is not limited to the laminated form of Fig. 1A and Fig. 1B, and various modifications are possible.

The laminated form of the second surface side of the metal foil 11 is not limited, and the package material exposed on the second surface is also included in the technical scope of the present invention. However, by coating the resin layer on the second surface of the metal foil 11, the metal foil is protected from the weathering property and the moldability is improved. Further, the coating layer is not limited to the heat-resistant resin layer 13 and the adhesive layer 12 of the embodiment, and may be replaced with a thin protective film layer. Although the thin protective film layer has a small effect of improving the formability, it is advantageous for thinning and weight reduction of the packaging material.

The cutting line 20 of the boundary between the easily peelable portion 21 and the non-peeling portion 22 in the heat-fusible resin layer 15 is formed on the region where the insulating layer 14 overlaps, and the metal foil 11 may not be exposed after the easy peeling portion 21 is removed. . In order to satisfy this condition, the cut line 20 shown in FIGS. 1A and 1B is formed on the inner side of the outline of the insulating layer 14, or the cut line 20 is formed at the same position as the outline of the insulating layer 14 as shown in FIG. In addition, the aforementioned insulating layer 14 may also be in the entire area of the metal foil 11. In the case where the insulating layer 14 is in the entire area of the metal foil 11, the position of the dicing line 20 and the insulating layer 14 is not required to be fitted, and the position where the easily peelable portion 21 and the insulating layer 14 are shifted and the metal foil 11 is exposed is not caused. Further, the heat-sealable resin layer 15 (non-peeling portion 22) and the metal foil 11 in the heat seal portion are not thermally blocked by the insulating layer 14.

Further, both of the heat-fusible resin layer 15 and the insulating layer 14 are made of a resin, and the adhesiveness of the resin itself can be used without using an adhesive, and the metal foil 11 can be laminated by using a heat roller or the like, or an adhesive can be used. The adhesion of the next. The joint portion between the metal foil 11 and the heat-fusible resin layer 15 and the joint portion between the metal foil 11 and the insulating layer 14 are not peeled off, and it is also preferable to use an adhesive strength.

The laminated packaging material 2 of Fig. 2 has an adhesive layer 17 on the first side of the metal foil 11, and the metal foil 11 and the insulating layer 14, the metal foil 11 and the heat-fusible resin layer 15 are strongly bonded via the adhesive layer 17. . Further, the adhesive layer 17 is not present between the insulating layer 14 and the heat-fusible resin layer 15. As described above, the preferable relationship between the adhesion forces of the respective layers is f3>f2>f1, f4>f2>f1, and the adhesion force f3 between the metal foil 11 and the insulating layer 14 is strengthened by the adhesive layer 17, and the metal foil When the adhesion force f4 between the heat-melting resin layer 15 and the heat-fusible resin layer 15 is relatively weakened by the adhesion force f1 between the insulating layer 14 and the heat-fusible resin layer 15 of the adhesive layer, an adhesion can be formed. Better strength and weakness.

Further, in the laminated packaging material 3 of Fig. 3, the adhesive layer 17 is provided only between the metal foil 11 and the heat-fusible resin layer 15, and the laminated state of the adhesive layer 17 is not provided between the metal foil 11 and the insulating layer 14. kind.

[Constituent materials for laminated packaging materials]

The material of the laminated packaging material is not limited in the present invention, and the following materials are exemplified as preferred materials.

(metal foil)

The above-mentioned metal foil 11 serves as a task of imparting gas barrier properties against the intrusion of gas or moisture generated by oxygen or electrolyte reaction in the laminated packaging material. For example, an aluminum foil, a copper foil, a nickel foil, a stainless steel foil, or such a coated foil, such a blunt foil or an unfired blunt foil may be mentioned. Further, a metal foil plated with a conductive metal such as nickel, tin, copper or chromium is preferably used, for example, by using an aluminum foil plated. Further, the thickness of the metal foil 11 is preferably from 7 to 150 μm.

Further, it is also preferable to form a film on the metal foil 11 as described above. In the chemical conversion film system, the film formed by the chemical conversion treatment is applied to the surface of the metal foil, and by such a chemical conversion treatment, corrosion of the surface of the metal foil due to the electrolytic solution can be sufficiently prevented. For example, the metal foil is subjected to a chemical conversion treatment by the following treatment. That is, the surface of the degreased metal is subjected to a coating process by applying an aqueous solution of any one of the following 1) to 3), and drying, and applying a chemical conversion treatment: 1) containing phosphoric acid, chromic acid, and selected from fluorine An aqueous solution of a mixture of at least one compound of a metal salt of a compound and a non-metal salt of a fluoride; 2) at least a group consisting of phosphoric acid, an acrylic resin, a chitosan derivative resin, and a phenol resin An aqueous solution of a resin of one kind and a mixture of at least one compound selected from the group consisting of chromic acid and chromium (III) salt; 3) containing phosphoric acid, a resin selected from the group consisting of an acrylic resin, a chitosan derivative resin, and a phenol resin, at least one selected from the group consisting of chromic acid and chromium (III) salt, and a compound selected from the group consisting of fluorine An aqueous solution of a mixture of at least one compound of the metal salt of the compound and the non-metal salt of the fluoride.

In the above-mentioned chemical conversion film, the amount of chromium adhesion (per side) is preferably from 0.1 mg/m ² to 50 mg/m ^{2 , and particularly} preferably from 2 mg/m ² to 20 mg/m ² .

(heat resistant resin layer)

The heat resistant resin constituting the heat resistant resin layer 13 is a heat resistant resin which is not melted at the heat sealing temperature at the time of heat sealing. The heat-resistant resin is preferably a heat-resistant resin having a melting point higher than a heat-fusible resin constituting the heat-fusible resin layer 15 by 10 ° C or higher, and a heat resistance higher than a melting point of the heat-melting resin by 20 ° C or higher. The resin is particularly good. For example, an extended polyimide film, an extended polyester film, an extended polyolefin film or the like is preferably used. Among them, a biaxially stretched polyimide film, a biaxially stretched polybutylene terephthalate (PBT) film, a biaxially oriented polyethylene terephthalate (PET) film or a biaxially oriented polyethylene naphthalate Ethylene glycol (PEN) film is particularly preferred. Further, the heat resistant resin layer 13 may be formed as a single layer, or may be formed as a composite layer of an extended polyester film/extended polyamide film (a laminate of an extended PET film/extended nylon film). ). The thickness of the heat resistant resin layer 13 is preferably 5 μm to 100 μm.

The heat-resistant resin layer 13 may be bonded to the metal foil 11 by the adhesiveness of the resin itself, and may be bonded to the adhesive layer 12, and may be selected as a binder from a polyester urethane-based adhesive and a polyether. It is preferred that at least one of the urethane-based adhesives is in the group. The thickness of the adhesive layer 12 is preferably set to 0.5 μm to 5 μm .

When the heat-resistant resin layer 13 is replaced with a protective film, the resin constituting the protective film is preferably a resin having heat resistance, and more preferably one or more of a thermosetting resin, a photocurable resin, and a two-liquid curing resin. These resins can easily control the curing reaction rate by the environment in which the resin such as temperature or light is weak, and the curing reaction rate can be adjusted according to the operation content, thereby shortening the shipping period. For example, in the coating of a resin, a thin layer can be efficiently formed over a wide area by delaying the hardening reaction rate for a long period of time in a coatable state. Further, after the resin is applied, the protective film can be completed in a short time by accelerating the curing reaction rate. The thermosetting resin is exemplified by an acid-denatured polyolefin resin, the photocurable resin is exemplified by an acrylic resin or an epoxy resin, and the two-liquid curing resin is exemplified by an urethane resin or an epoxy resin.

The thickness of the protective film layer is preferably from 0.5 μm to 5 μm. The protective effect of the metal foil 11 is less than 0.5 μm, and the effect of thinning and weight reduction of the packaging material is small. The thickness is particularly preferably 1 μm to 3 μm.

(heat-melting resin layer)

The hot-melt resin constituting the hot-melt resin layer 13 is at least one selected from the group consisting of polyethylene, polypropylene, olefin-based copolymers, acid denatured materials, and ionomers. The composition of the unstretched film composed of the heat-fusible resin is preferred. The thickness of the heat-fusible resin layer 13 is preferably set to 20 μm to 150 μm .

(Insulation)

The insulating layer 14 is preferably a biaxially oriented polyimide film, a biaxially stretched polyester film, a biaxially stretched polyolefin film, or the like, on the condition of insulation. The insulating layer 14 ensures insulation of the packaging material and is thinned, and the thickness thereof is preferably set to 5 μm to 15 μm.

Further, between the metal foil 11 and the insulating layer 14, and between the metal foil 11 and the heat-fusible resin layer 15, the adhesive layer 17 is used, and the adhesive is an olefin-based adhesive, an acrylic adhesive, or an epoxy. It is preferred to use an adhesive or the like. Further, the adhesive layer 17 and the insulating layer 14 are made of a layer having insulating properties, solvent resistance, and moisture resistance, and may be replaced with, for example, a polyolefin resin, an acrylic resin, or an epoxy resin. The layer preferably has a thickness of from 0.5 μm to 10 μm.

(The protective layer)

As the protective layer 16, a polyolefin film, a polyester film, a polyamide film or the like is preferably used. The thickness of the protective layer 16 is preferably 10 μm to 150 μm. When the thickness is less than 10 μm, the effect of improving the formability at the time of forming the embossed portion is small. Further, if the thickness is 150 μm, sufficient formability can be obtained, so that the excess thickness is excessive. The particularly preferable thickness is 20 μm to 60 μm.

Further, since the protective layer 16 directly contacts the layer of the forming tool such as the stretch forming at the time of molding the embossed portion, it is preferable that the surface property of the forming tool is easily slid without interfering with the plastic deformation. From such a viewpoint, the surface of the protective layer 16 preferably has a dynamic friction coefficient of 1.0 or less as defined in JIS K7125 (1999), and more preferably 0.6 or less.

(other)

The laminated packaging material of the present invention comprises a layer and a portion which are finally removed, and an adhesive force between the layers which can be adjusted by a release agent, a release paper, an adhesive or the like is suitably used.

For example, it is preferable that the adhesion force f1 between the insulating layer 14 and the heat-fusible resin layer 15 is the weakest, but it is difficult to peel off because both of them are resins and the resin itself has adhesiveness (adhesiveness). The release agent is applied between or the like, or the adhesion force f1 is actively weakened by the inclusion of the release paper. If the adhesion force f1 between the insulating layer 14 and the heat-fusible resin layer 15 When the pressure is weakened, the difference between the adhesion force f2 of the protective layer 16 and the heat-fusible resin layer 15 is increased, so that the easy peeling portion 21 adheres to the protective layer 16 and is easily removed together with the protective layer 16.

Further, the protective layer 16 can be bonded by the adhesiveness (adhesiveness) of the protective layer 16 and the heat-fusible resin layer 15 itself, and the adhesive or release agent can be applied in accordance with the material to adjust the bonding force f2. .

[Manufacturing method of laminated packaging material]

The laminated packaging material can be produced by laminating the respective layers in the form of a laminate as shown. Hereinafter, an example of a manufacturing procedure of the laminated packaging material 1 of FIGS. 1A and 1B will be described. Further, the laminated packaging material of the present invention is not limited to the bonding of the respective layers in the following order, and the order of bonding can be arbitrarily set.

(1) An adhesive is applied to the second surface of the metal foil 11 to form an adhesive layer 12.

(2) The heat-resistant resin layer 13 is laminated on the second surface of the metal foil 11 via the adhesive layer 12, and the metal foil 11 and the heat-resistant resin layer 13 are bonded together.

(3) The thermal roller laminated insulating layer 14 is used at a desired position on the first surface of the metal foil 11.

(4) The heat-melting resin layer 15 is laminated on the entire first side of the metal foil 11 by using a heat roller.

(5) The layer of the heat-melting resin layer 15 which is laminated on the insulating layer 14 is formed to form the cut-out line 20, and is divided into the easily peelable portion 21 which surrounds the heat-fusible resin layer 15 in the cut-out line 20, and the cut-out line 20 is not surrounded. Non-peeling portion 22. The cutting line 20 is a hot-melting tree by means of a tool such as a Thomson blade or a Pinnacle blade, a laser cutting machine, a hot knife, or the like. The lipid layer 15 is formed by cutting. The cutting line 20 is not limited to the hole-shaped wiring that penetrates the heat-fusible resin layer 15. Other cut lines may be exemplified by slits cut to the thickness of the resin layer. The aforementioned slit may be a line of a line, or may be a dotted line of a continuous short slit. Further, even if the easily peelable portion 21 is completely cut, if it is left in the laminated packaging material, the cutting line is contained in the cutting line of the present invention.

(6) A heat roller build-up protective layer 16 is used for the heat-fusible resin layer 15.

Further, when the laminated packaging material 2 of Fig. 2 is produced, a step of applying an adhesive to form the adhesive layer 17 on the first surface of the metal foil 11 between the above steps (2) and (3) is carried out. Further, when the laminated packaging material 3 of Fig. 3 is produced, an adhesive is applied to the region other than the insulating layer 14 on the first side of the metal foil 11 between the above steps (3) and (4) to form an adhesive layer 17 The steps.

Further, in the case where the protective film layer is formed on the second surface of the metal foil 11, the resin for the protective film layer is applied and dried in place of the above steps (1) and (2).

The laminated packaging material 1 can be manufactured into a container having an easily peelable portion 21 of a comparable size, and a large-sized packaging material or a long-sized packaging material having a plurality of easily peelable portions 21 can be produced. The production of large-sized packaging materials and long-sized packaging materials is carried out in various steps, so that the manufacturing efficiency is good. In addition, since the packaging material can be wound into a roll shape, it is easy to store and manage. The large-sized packaging material and the long-sized packaging material are cut into a shape in which the easily peelable portions 21 are surrounded by the non-peeling portion 22 and arranged.

The laminated packaging material 1 to be produced is formed into an embossed portion by extension processing or the like if necessary. Fig. 4 is a view showing a laminated packaging material 4 in which a laminated packaging material 1 for forming a planar sheet is formed with a flange 31 at and around the embossed portion 30. The embossed portion 30 protrudes from the side of the heat-resistant resin layer 13, the heat-resistant resin layer 13 is convex, and the protective layer 16 is formed into a concave surface. The laminated packaging material 4, by embossing The portion 30 is useful as a container material for enlarging the internal volume.

In addition, various layers of information can be printed on the protective layer 16 of the laminated packaging material 1 produced. The protective layer 16 is a layer that is finally peeled off, and the steps can be assisted by printing the cutting position or the forming position of the embossed portion. In addition, the management of the packaging material can be assisted by printing the packaging material information.

[Power storage device and method of manufacturing the same]

The laminated packaging material of the present invention is used as a material for a container of a power storage device, a container for food or medicine, and the like. In the electricity storage device 5 of Fig. 5, the material of the container 40 is exemplified by the laminated packaging material of the present invention.

The container 40 is a container body 41 composed of the laminated packaging material 4 having the embossed portion 30 and the flange portion 31 of Fig. 4, and a laminated sheet of a planar sheet having the same size as the planar size of the container body 41. The cover 42 composed of the material 1 is configured, and the space surrounded by the embossed portion 30 and the cover 42 of the container body 41 is the storage chamber 43. The laminated packaging materials 1 and 4 constituting the container body 41 and the lid 42 are provided with the protective layer 16 and the easily peelable portion 21 of the heat-fusible resin layer 15 to expose the insulating layer 14 on the inner surface of the storage chamber 43. Further, the non-peeling portion 22 of the heat-fusible resin layer 15 is present on the flange 31 of the container body 41, and the portion of the cover 42 overlapping the flange 31 of the container body 41 also has a non-heat-smelting resin layer 15 Peeling portion 22.

The power storage device main body 50 is housed in the storage chamber 43 of the container 40. The positive electrode and the negative electrode of the power storage device main body 50 are connected to the positive electrode tab 51 and the negative electrode tab 52, and the positive electrode tab 51 and the negative electrode connector are pulled out from between the container body 41 and the cover 42 in one of the storage chambers 43. In the state of the sheet 52, the overlapping portion of the flange 31 of the container body 41 and the periphery of the lid 42 is heated, and the non-peeling portions 22 (the heat-fusible resin layer 15) are melted and formed. Heat seal.

The power storage device 5 is formed on the inner surface of the storage chamber 43 of the container 40 to remove the heat-fusible resin layer 15, thereby achieving thinning and weight reduction. Further, since the formation of the embossed portion 30 of the container body 41 is performed with the protective layer 16 and the heat-fusible resin layer 15, the deep embossed portion 30 can be formed.

Further, the power storage device using the laminated packaging material of the present invention is not limited to the shape of any container, the form of the power storage device body, the position of the tab, the storage device for storage, and the method of energizing the outside. The material of the container should be used in the present invention as long as the laminated package of the present invention is used. Further, a power storage device using a pouch type container having no embossed portion is also included in the scope of the present invention.

[Examples]

In Examples 1 to 4, in place of the heat-resistant resin 13 and the adhesive layer 12 on the second surface of the metal foil 11 of the laminated packaging material 3 of Fig. 3, a thin protective film layer was formed, and the dynamic friction coefficient was different on the first surface. The protective layer 16 is made of a laminated packaging material. The protective layer 16 is a surface of the resin film of the material and thickness of Table 1, and is roughened to the described dynamic friction coefficient. The following common materials are used in addition to the protective layer 16.

Metal foil 11: Aluminum foil of JIS H4160 classification A8079, thickness 40μm

Protective film layer: epoxy layer, thickness 3μm

Insulation layer 14: 2-axis extended polypropylene film, thickness 10μm

Heat-melting resin layer 15: unstretched polypropylene film, thickness 40 μm

Next agent layer 17: polyolefin-based adhesive, thickness 2 μm

The protective layer 16 used in each example is shown in Table 1, based on JIS K7125. The dynamic friction coefficient measured in (1999) is shown in Table 1.

The laminated packaging materials 1 of Examples 1 to 4 were produced by the following methods.

(1) A protective film layer is formed on the second area layer of the metal foil 11.

(2) An insulating layer 14 of 55 mm × 35 mm is bonded to the center of the first surface of the metal foil 11 by using a heat roller.

(3) On the first surface of the metal foil 11, the region of the insulating layer 14 is removed, and the adhesive layer 17 is formed by applying a binder to the gravure roll.

(4) The heat-melting resin layer 15 is entirely bonded to the first surface side of the metal foil 11. Therefore, the insulating layer 14 is directly laminated on the metal foil 11, and the heat-fusible resin layer 15 is laminated on the metal foil 11 via the adhesive layer 17.

(5) In the heat-fusible resin layer 15, a cut line 20 is formed along the outline of the insulating layer 14, and is divided into an easily peelable portion 21 and a non-peeling portion.

(6) A heat roller build-up protective layer 16 is used for the heat-fusible resin layer 15.

In the comparative example, a laminate of the unprotected layer 16 was produced by the steps (1) to (4) using the materials common to the examples.

The laminated packaging materials of Examples 1 to 4 and Comparative Examples were subjected to a molding test for forming an embossed portion (see FIG. 4) by deep drawing, and the moldability was evaluated.

The deep drawing forming tool includes: a punching machine that presses the laminated packaging material to form an inner surface shape of the embossed portion; and a die having a square hole that flows into the laminated packaging material into which the punch press is pressed; The bead ring has a quadrangular hole of the same size as the hole of the aforementioned die, and presses the laminated package around the hole. The top surface of the punch is 55 mm x 35 mm.

Deep extension forming, facing the protective layer of laminated packaging material at the top of the punching machine (Examples 1 to 4) or the heat-fusible resin layer 15 (Comparative Example), the convex surface of the embossed portion was formed into a heat-resistant resin layer 13, and the concave surface was a protective layer (Examples 1 to 4) or a heat-melting resin. In the aspect of layer 15 (comparative example), the depth of extension (the height of the embossed portion) was changed. Next, the occurrence of pinholes and cracks at the corners of the embossed portion of the molded article was observed, and such a limit depth was not generated as the maximum forming depth of the laminated packaging material. Table 1 shows the forming depth.

According to the above test results, it was confirmed that the moldability was improved by providing the protective layer, and a deeper embossed portion could be formed. Further, it was confirmed that high formability can be obtained by lowering the dynamic friction coefficient of the protective layer.

Further, the ends of the protective layer 16 of the laminated packaging material after the forming of Examples 1 to 4 were pulled, and the easily peelable portion 21 of the heat-fusible resin layer 15 was peeled off from the insulating layer 14 together with the protective layer 16.

The present application claims the priority of Japanese Patent Application No. 2016-9382, the entire disclosure of which is hereby incorporated by reference. It forms part of this application.

The terms and descriptions used herein are for describing embodiments of the invention, but the invention is not limited thereto. It is to be understood that any equivalents of the features disclosed and described herein are not to be construed as limited.

[Industry Utilization]

The laminated packaging material of the present invention can be utilized for a container material which is required to be thinner and lighter.

1‧‧‧ laminated packaging

11‧‧‧metal foil

12‧‧‧ adhesive layer

13‧‧‧Heat resistant resin layer

14‧‧‧Insulation

15‧‧‧Hot melt resin layer

16‧‧‧Protective layer

20‧‧‧Cut line

21‧‧‧Easy stripping department

22‧‧‧ Non-peeling department

Claims (7)

A laminated packaging material characterized by: a metal foil; an insulating layer laminated on at least a portion of the first surface of the metal foil; and a heat-melting resin layer laminated on the insulating layer a first surface side of the metal foil; and a protective layer laminated on the heat-fusible resin layer and composed of a resin film peelable to the heat-fusible resin layer; and the heat-melting resin layer, It is divided into at least one easily peelable portion and a non-peeling portion, and the easily peelable portion is surrounded by a cut line formed by cutting the heat-fusible resin layer, and the non-peeling portion is disposed around the easily peelable portion and is not cut out. Surrounding and providing at least the aforementioned easily peelable portion in a region where the insulating layer overlaps. The laminated packaging material according to the first aspect of the invention, wherein the adhesion force f1 between the insulating layer and the heat-fusible resin layer, and the adhesion force f2 between the protective layer and the heat-melting resin layer. The adhesion force f3 between the metal foil and the insulating layer is such that the adhesion force f4 between the metal foil and the heat-fusible resin layer satisfies the relationship of f3>f2>f1 and f4>f2>f1. The laminated packaging material according to the first aspect of the invention, wherein the metal foil and the heat-fusible resin layer are laminated via an adhesive layer, and the metal foil and the insulating layer are laminated via an adhesive layer. The insulating layer and the heat-fusible resin layer are laminated without interposing an adhesive layer. The laminated packaging material according to claim 1, wherein the surface of the protective layer has a dynamic friction coefficient of 1.0 or less. The laminated packaging material according to claim 1, wherein the laminated packaging material has a plurality of easily peelable portions. The laminated packaging material according to the first aspect of the invention, wherein the protective layer has a depressed embossed portion, and the easily peelable portion is present in the embossed portion. A method of producing a power storage device, characterized in that the protective layer of the laminated packaging material according to any one of claims 1 to 6 and the easily peelable layer of the heat-melting resin layer are removed and the insulating layer is exposed. A container in which the exposed insulating layer faces the storage chamber and not protrudes from the storage chamber is formed, and a power storage device is inserted into the storage chamber of the container, and the non-peeling portion of the container is heat-sealed and sealed in the storage device in the storage chamber.