Exterior material for partition members, method for manufacturing exterior material for partition members, partition members, and structures

Abstract

Provided is an exterior material for a partition member composed of a laminate including at least a metal layer, an adhesive layer, and a heat-fusible resin layer in this order, in which a decrease in the adhesive force between the metal layer and the heat-fusible resin layer of the exterior material is suppressed. An exterior material for a partition member used for a partition member disposed between a plurality of heating elements, the exterior material for the partition member is composed of a laminate including at least a metal layer, an adhesive layer, and a heat-fusible resin layer in this order, and the adhesive layer is formed of a cured product of a polyolefin-based adhesive.

Description

Technical Field

[0001] The present disclosure relates to an exterior material for a partition member, a method for manufacturing the exterior material for a partition member, a partition member, and a structure.

Background Art

[0002] In a structure having a plurality of heating elements, for example, a partition member for cooling the heating elements is disposed between the plurality of heating elements. The partition member is composed of, for example, a coolant and an exterior material that packages the coolant. (For example, Patent Documents 1 to 3)

[0003] For example, Patent Document 1 discloses a battery module in which a plurality of unit cells are arranged, and a cooling unit containing a coolant is provided in the vicinity of the unit cells. The cooling unit has a sealed portion formed by sealing a sheet-like member, and an unsealing portion that is unsealed when the unit cell abnormally generates heat is provided in a part of the sealed portion. In the battery module (structure), a cooling unit as a partition member is disposed between unit cells as a plurality of heating elements.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] The inventors of the present disclosure have found that, in a partition member disposed between a plurality of heating elements, when the exterior material of the partition member is composed of a laminate in which a metal layer and a heat-fusible resin layer are adhered via an adhesive layer, the adhesive force of the adhesive layer that adheres the metal layer and the heat-fusible resin layer may decrease due to the influence of the contents (such as a coolant) of the partition member.

[0006] The present disclosure mainly aims to provide an exterior material for a partition member, which is composed of a laminate including at least a metal layer, an adhesive layer, and a heat-fusible resin layer in this order, and in which a decrease in the adhesive force between the metal layer and the heat-fusible resin layer of the exterior material is suppressed, as well as a partition member and a structure using the exterior material.

Means for Solving the Problems

[0007] The inventors of the present disclosure have conducted intensive studies to solve the above problems. As a result, they have found that by forming an exterior material for a partition member used between a plurality of heating elements from a laminate including at least a metal layer, an adhesive layer, and a heat-fusible resin layer in this order, and forming the adhesive layer from a cured product of a polyolefin-based adhesive, a decrease in the adhesive force between the metal layer and the heat-fusible resin layer of the exterior material can be suppressed.

[0008] Based on such findings, the present disclosure has been completed through further studies. That is, the present disclosure provides an invention in the following aspects. An exterior material for a partition member used between a plurality of heating elements, wherein the exterior material for the partition member is composed of a laminate including at least a metal layer, an adhesive layer, and a heat-fusible resin layer in this order, and the adhesive layer is formed from a cured product of a polyolefin-based adhesive.

Effects of the Invention

[0009] According to the present disclosure, there is provided an exterior material for a partition member, which is composed of a laminate including at least a metal layer, an adhesive layer, and a heat-sealable resin layer in this order, and in which a decrease in the adhesive force between the metal layer and the heat-sealable resin layer of the exterior material is suppressed. Further, according to the present disclosure, there can also be provided a partition member and a structure using the exterior material.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0011] The exterior material for a partition member of the present disclosure is an exterior material for a partition member used for a partition member disposed between a plurality of heat-generating bodies, and is composed of a laminate including at least a metal layer, an adhesive layer, and a heat-sealable resin layer in this order, and the adhesive layer is formed of a cured product of a polyolefin-based adhesive. The exterior material for a partition member of the present disclosure has such a configuration that a decrease in the adhesive force between the metal layer and the heat-sealable resin layer of the exterior material is suppressed.

[0012] Hereinafter, the exterior material for the partition member of the present disclosure will be described in detail. In this specification, the numerical range indicated by "~" means "or more" and "or less". For example, the notation of 2~15 mm means 2 mm or more and 15 mm or less. In the numerical ranges described step by step in the present disclosure, the upper limit value or the lower limit value described in a certain numerical range may be replaced with the upper limit value or the lower limit value of the numerical range described in other step-by-step descriptions. Further, the upper limit values, the upper limit value and the lower limit value, or the lower limit values described separately may be combined to form a numerical range, respectively. Also, in the numerical ranges described in the present disclosure, the upper limit value or the lower limit value described in a certain numerical range may be replaced with the value shown in the examples.

[0013] In the exterior material for the partition member, regarding the metal layer 1 described later, usually, the MD (Machine Direction) and TD (Transverse Direction) in the manufacturing process can be distinguished. For example, when the metal layer 1 is composed of a metal foil such as an aluminum alloy foil or a stainless steel foil, linear streaks called so-called rolling marks are formed on the surface of the metal foil in the rolling direction (RD: Rolling Direction) of the metal foil. Since the rolling marks extend along the rolling direction, the rolling direction of the metal foil can be grasped by observing the surface of the metal foil. Further, in the manufacturing process of the laminate, usually, since the MD of the laminate coincides with the RD of the metal foil, the MD of the laminate can be specified by observing the surface of the metal foil of the laminate and specifying the rolling direction (RD) of the metal foil. Also, since the TD of the laminate is perpendicular to the MD of the laminate, the TD of the laminate can also be specified.

[0014] In addition, when the MD of the exterior material for the partition member cannot be specified due to rolling marks on a metal foil such as an aluminum alloy foil or a stainless steel foil, it can be specified by the following method. As a method for confirming the MD of the exterior material for the partition member, there is a method of observing a cross section of the heat-sealable resin layer of the exterior material for the partition member with an electron microscope to confirm the sea-island structure. In this method, the direction parallel to the cross section in which the average of the diameters of the island shapes in the direction perpendicular to the thickness direction of the heat-sealable resin layer is the largest can be determined as the MD. Specifically, the cross section in the length direction of the heat-sealable resin layer and the cross sections (a total of 10 cross sections) from the direction parallel to the cross section in the length direction to the direction perpendicular to the cross section in the length direction, with the angle changed by 10 degrees each time, are observed with an electron microscope photograph to confirm the sea-island structure. Next, in each cross section, the shape of each individual island is observed. Regarding the shape of each individual island, the straight-line distance connecting the leftmost end in the direction perpendicular to the thickness direction of the heat-sealable resin layer and the rightmost end in the perpendicular direction is defined as the diameter y. In each cross section, the average of the top 20 diameters y in descending order of the diameter y of the island shape is calculated. The direction parallel to the cross section in which the average of the diameter y of the island shape is the largest is determined as the MD.

[0015] 1. Laminated structure of exterior material for partition member The exterior material 10 for the partition member of the present disclosure is composed of a laminate including at least a metal layer 1, an adhesive layer 3, and a heat-sealable resin layer 2, in this order from the outside, as shown in FIGS. 1 to 4, for example. In the exterior material 10 for the partition member, the heat-sealable resin layer 2 is the innermost layer. As shown in FIG. 5, in the partition member 20 of the present disclosure, the contents (for example, the coolant 21) of the partition member 20 are accommodated in a space formed by heat-sealing the peripheral portions in a state where the heat-sealable resin layers 2 of the exterior material 10 for the partition member face each other. In the laminate constituting the exterior material 10 for the partition member of the present disclosure, with the metal layer 1 as a reference, the side of the heat-sealable resin layer 2 is the inner side with respect to the metal layer 1, and the opposite side of the metal layer 1 is the outer side.

[0016] The metal layer 1 preferably has a corrosion-resistant film on at least the surface on the side of the heat-sealable resin layer 2. The corrosion-resistant film may be provided only on the surface of the metal layer 1 on the side of the heat-sealable resin layer 2, or may be provided on both surfaces of the metal layer 1.

[0017] As shown in FIGS. 1 to 4, for example, the exterior material 10 for the partition member has an adhesive layer 3 between the metal layer 1 and the heat-sealable resin layer 2 (or the resin layer 4 etc. described later) for the purpose of enhancing the adhesiveness between these layers. The adhesive layer 3 is a layer that contacts the metal layer 1 inside the metal layer 1 and enhances the adhesive force with the layer (such as the heat-sealable resin layer 2 and the resin layer 4) inside the metal layer 1.

[0018] Also, as shown in FIGS. 2 to 4, for example, the exterior material 10 for the partition member may have a resin layer 4 between the adhesive layer 3 and the heat-sealable resin layer 2. When having the resin layer 4, as shown in FIG. 2, the resin layer 4 and the heat-sealable resin layer 2 may be directly adhered, or as shown in FIGS. 3 and 4, the resin layer 4 and the heat-sealable resin layer 2 may be adhered via an adhesive layer 5.

[0019] Also, as shown in FIG. 4, for example, the exterior material 10 for the partition member may have a protective layer 6 outside the metal layer 1. When having the protective layer 6, the protective layer 6 and the metal layer 1 may be directly adhered (not shown), or as shown in FIG. 4, the protective layer 6 and the metal layer 1 may be adhered via an adhesive layer 7.

[0020] The thickness of the laminate constituting the partition member exterior material 10 is not particularly limited. However, from the viewpoints of the cooling efficiency of the heating element, cost reduction, etc., for example, it is about 210 μm or less, preferably about 190 μm or less, about 180 μm or less, about 155 μm or less, about 120 μm or less. Further, from the viewpoint of maintaining the function of the partition member exterior material to protect the contents, the thickness of the laminate constituting the partition member exterior material 10 is preferably about 35 μm or more, about 45 μm or more, about 60 μm or more. Also, regarding the preferable range of the laminate constituting the partition member exterior material 10, for example, about 35 to 210 μm, about 35 to 190 μm, about 35 to 180 μm, about 35 to 155 μm, about 35 to 120 μm, about 45 to 210 μm, about 45 to 190 μm, about 45 to 180 μm, about 45 to 155 μm, about 45 to 120 μm, about 60 to 210 μm, about 60 to 190 μm, about 60 to 180 μm, about 60 to 155 μm, about 60 to 120 μm can be mentioned.

[0021] In the partition member exterior material 10, the ratio of the total thickness of the protective layer 6 provided as necessary, the adhesive layer 7 provided as necessary, the metal layer 1, the adhesive layer 3, the resin layer 4 provided as necessary, the adhesive layer 5 provided as necessary, and the heat-fusible resin layer 2 to the thickness (total thickness) of the laminate constituting the partition member exterior material 10 is preferably 90% or more, more preferably 95% or more, and even more preferably 98% or more. As a specific example, when the partition member exterior material 10 of the present disclosure includes the protective layer 6, the adhesive layer 7, the metal layer 1, the adhesive layer 3, and the heat-fusible resin layer 2, the ratio of the total thickness of these layers to the thickness (total thickness) of the laminate constituting the partition member exterior material 10 is preferably 90% or more, more preferably 95% or more, and even more preferably 98% or more. Also, when the partition member exterior material 10 of the present disclosure is a laminate including the protective layer 6, the adhesive layer 7, the metal layer 1, the adhesive layer 3, the resin layer 4, the adhesive layer 5, and the heat-fusible resin layer 2, the ratio of the total thickness of these layers to the thickness (total thickness) of the laminate constituting the partition member exterior material 10 can be, for example, 80% or more, preferably 90% or more, more preferably 95% or more, and even more preferably 98% or more.

[0022] The exterior material 10 for the partition member of the present disclosure has an adhesion strength after storage in a humid and hot environment, measured by the following [Adhesion Evaluation of Exterior Material], preferably 1.0 N / 15 mm or more, more preferably 1.5 N / 15 mm or more, still more preferably 2.0 N / 15 mm or more. Regarding the upper limit, for example, it is preferably 15.0 N / 15 mm or less. Preferred ranges include about 1.0 to 15.0 N / 15 mm, about 1.5 to 15.0 N / 15 mm, and about 2.0 to 15.0 N / 15 mm.

[0023] Also, the exterior material 10 for the partition member of the present disclosure has an adhesion strength before storage in a humid and hot environment, measured by the following [Adhesion Evaluation of Exterior Material], preferably 1.0 N / 15 mm or more, more preferably 1.5 N / 15 mm or more, still more preferably 2.0 N / 15 mm or more, and 6.0 N / 15 mm or more. Regarding the upper limit, for example, it is preferably 20.0 N / 15 mm or less, 18.0 N / 15 mm or less. Preferred ranges include about 1.0 to 20.0 N / 15 mm, about 1.5 to 20.0 N / 15 mm, about 2.0 to 20.0 N / 15 mm, about 1.0 to 20.0 N / 15 mm, about 1.0 to 18.0 N / 15 mm, about 1.5 to 18.0 N / 15 mm, and about 1.5 to 18.0 N / 15 mm.

[0024] [Adhesion Evaluation of Exterior Material] The exterior material for the partition member shall have a size of TD100 mm × MD150 mm. Using a PCT apparatus, the exterior material is stored in a hydrothermal environment (temperature 120°C, relative humidity 100%, pressure 0.199 MPa) for 16 days. The adhesion strength of the exterior material before and after storage is measured. The measurement location of the adhesion strength is the interface portion between the metal layer of the exterior material and the layer on the side of the heat-sealable resin layer (the portion where the adhesive layer adhered to the metal layer is located). The specific method for measuring the adhesion strength is as follows. Each exterior material for the partition member is further cut into a rectangle of TD15 mm × MD100 mm to obtain a measurement sample. Next, after partially T-peeling in the MD direction between the metal layer (aluminum alloy foil) of the measurement sample and the layer adhered to the metal layer via the adhesive layer, the aluminum alloy foil side and the heat-sealable resin layer side are respectively fixed to the grips of a tensile testing machine so that the MD direction becomes the tensile direction, and the measurement is carried out at a chuck distance of 50 mm and a tensile speed of 100 mm / min to obtain the adhesion strength.

[0025] 2. Each layer forming the exterior material for partition member [Metal layer 1] In the exterior material for the partition member, the metal layer 1 is a layer capable of exhibiting gas barrier performance against gases such as oxygen and water vapor. A plurality of metal layers 1 may be provided.

[0026] The metal layer 1 is a layer composed of a metal material. Specific examples of the metal material constituting the metal layer 1 include metals such as aluminum, nickel, stainless steel, titanium steel, iron, and steel, or alloys containing these.

[0027] In the metal layer 1, the layer composed of the above-described metal material may contain a recycled material of the metal material. Examples of the recycled material of the metal material include recycled materials of aluminum alloys, stainless steels, titanium steels, or steel sheets. These recycled materials can be obtained by known methods respectively. The recycled material of the aluminum alloy can be obtained, for example, by the manufacturing method described in International Publication No. 2022 / 092231. The metal layer 1 may be composed of only the recycled material or may be composed of a mixed material of the recycled material and the virgin material. Note that the recycled material of the metal material refers to a metal material that has been recycled to a reusable state by collecting, separating, purifying, etc. various products used in the market and waste generated from the manufacturing process. Also, the virgin material of the metal material refers to a new metal material refined from natural resources (raw materials) of the metal and not a recycled material.

[0028] Examples of the metal layer 1 include a metal foil having barrier properties, a metal film, etc. The thickness of the metal film is not particularly limited as long as the desired gas barrier performance can be exhibited, and is appropriately set according to the type of the metal film. For example, when the metal film is an aluminum film, the thickness of the metal film is preferably 10 nm or more and 250 nm or less, more preferably 20 nm or more and 200 nm or less, and even more preferably 40 nm or more and 150 nm or less from the viewpoints of gas barrier properties, adhesion to the resin substrate, and crack resistance.

[0029] The metal film is usually arranged so as to be in direct contact with the resin substrate. Also, the metal film may be, for example, a vapor deposition film or a coating film.

[0030] Further, the resin substrate is not particularly limited as long as it can support the metal film. Examples of the resin constituting the resin substrate include polyolefin resins such as polyethylene (PE) and polypropylene (PP); polyester resins such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT); cyclic polyolefin resins; polystyrene resins; acrylonitrile-styrene copolymer (AS resin); acrylonitrile-butadiene-styrene copolymer (ABS resin); poly(meth)acrylic resins; polycarbonate resins; polyvinyl alcohol-based resins such as polyvinyl alcohol (PVA) and ethylene-vinyl alcohol copolymer (EVOH); saponified ethylene-vinyl ester copolymer; polyamide resins such as various nylons; polyimide resins; polyurethane resins; acetal resins; cellulose resins, and the like.

[0031] The resin substrate may be surface-treated. This can improve the adhesion to the metal film.

[0032] The thickness of the resin substrate is not particularly limited and can be set as appropriate. For example, the thickness of the resin substrate may be 10 μm or more and 150 μm or less.

[0033] When the metal layer <1> is a metal foil, an aluminum alloy foil, a stainless steel foil, etc. are preferable.

[0034] From the perspective of the followability of the aluminum alloy foil to the contents of the exterior material for the partition member, for example, it is more preferably a soft aluminum alloy foil composed of, for example, an annealed aluminum alloy or the like. From the perspective of better followability to the contents, it is preferably an aluminum alloy foil containing iron. In the aluminum alloy foil containing iron (100% by mass), the iron content is preferably 0.1 to 9.0% by mass, and more preferably 0.5 to 2.0% by mass. When the iron content is 0.1% by mass or more, an exterior material for the partition member having better followability can be obtained. When the iron content is 0.1% by mass or more, an exterior material for the partition member having better followability can be obtained. When the iron content is 9.0% by mass or less, an exterior material for the partition member having better flexibility can be obtained. Examples of the soft aluminum alloy foil include aluminum alloy foils having compositions specified by JIS H4160:1994 A8021H-O, JIS H4160:1994 A8079H-O, JIS H4000:2014 A8021P-O, or JIS H4000:2014 A8079P-O. Also, if necessary, silicon, magnesium, copper, manganese, etc. may be added. The softening can be performed by annealing or the like.

[0035] In addition, examples of the stainless steel foil include austenitic, ferritic, austenitic-ferritic, martensitic, and precipitation-hardening stainless steel foils. Further, from the perspective of providing an exterior material for the partition member with excellent followability, the stainless steel foil is preferably composed of austenitic stainless steel.

[0036] Specific examples of the austenitic stainless steel constituting the stainless steel foil include SUS304, SUS301, SUS316L, etc. Among these, SUS304 is particularly preferred.

[0037] In the case of a metal foil, the thickness of the metal layer 1 only needs to exhibit its function as a metal layer having gas barrier performance against gases such as oxygen and water vapor, and for example, it can be about 9 to 200 μm. The thickness of the metal layer 1 is preferably about 85 μm or less, more preferably about 50 μm or less, still more preferably about 40 μm or less, particularly preferably about 35 μm or less, particularly preferably about 30 μm or less, and particularly preferably about 20 μm or less. Also, the thickness of the metal layer 1 is preferably about 9 μm or more, and still more preferably about 10 μm or more. Also, the preferable range of the thickness of the metal layer 1 includes about 9 to 85 μm, about 9 to 50 μm, about 9 to 40 μm, about 9 to 35 μm, about 9 to 30 μm, about 9 to 20 μm, about 10 to 85 μm, about 10 to 50 μm, about 10 to 40 μm, about 10 to 35 μm, about 10 to 30 μm, and about 10 to 20 μm. When the metal layer 1 is composed of an aluminum alloy foil, the above-mentioned range is particularly preferable. Also, from the viewpoint of imparting high followability and high rigidity to the exterior material 10 for the partition member, the thickness of the metal layer 1 is preferably about 35 μm or more, more preferably about 45 μm or more, still more preferably about 50 μm or more, still more preferably about 55 μm or more, and is also preferably about 200 μm or less, more preferably about 85 μm or less, still more preferably about 75 μm or less, still more preferably about 70 μm or less. The preferable range includes about 35 to 200 μm, about 35 to 85 μm, about 35 to 75 μm, about 35 to 70 μm, about 45 to 200 μm, about 45 to 85 μm, about 45 to 75 μm, about 45 to 70 μm, about 50 to 200 μm, about 50 to 85 μm, about 50 to 75 μm, about 50 to 70 μm, about 55 to 200 μm, about 55 to 85 μm, about 55 to 75 μm, and about 55 to 70 μm. By the exterior material 10 for the partition member having high followability, deep drawing forming becomes easy. Also, by increasing the rigidity of the exterior material 10 for the partition member, it can contribute to high sealing performance of the contents. Also, particularly when the metal layer 1 is composed of a stainless steel foil, the thickness of the stainless steel foil is preferably about 60 μm or less, more preferably about 50 μm or less, still more preferably about 40 μm or less, still more preferably about 30 μm or less, and particularly preferably about 25 μm or less.Also, the thickness of the stainless steel foil is preferably about 10 μm or more, more preferably about 15 μm or more. Also, preferable ranges of the thickness of the stainless steel foil include about 10 to 60 μm, about 10 to 50 μm, about 10 to 40 μm, about 10 to 30 μm, about 10 to 25 μm, about 15 to 60 μm, about 15 to 50 μm, about 15 to 40 μm, about 15 to 30 μm, and about 15 to 25 μm.

[0038] [Corrosion-resistant film] The metal layer 1 preferably has a corrosion-resistant film on at least the surface on the side of the heat-fusible resin layer 2. The metal layer 1 may have a corrosion-resistant film only on the surface on the side of the heat-fusible resin layer 2, or may have corrosion-resistant films on both surfaces of the metal layer 1.

[0039] The partition member disposed between the plurality of heating elements is required to have dimensional stability. However, as a result of investigations by the inventor of the present disclosure, it has been found that the partition member may generate gas and expand inside due to the influence of the contents (such as a coolant containing water) packaged by the exterior material. More specifically, when the exterior material of the partition member includes a metal layer, the metal layer of the exterior material may react with the contents to generate gas, and the partition member may expand. When the partition member expands, the characteristics of the heating element may deteriorate due to displacement of the heating element or compression of the heating element.

[0040] In the exterior material for the partition member of the present disclosure, by providing a corrosion-resistant film on at least the surface of the metal layer 1 on the side of the heat-fusible resin layer 2, the effect of suppressing the expansion of the partition member can be exhibited.

[0041] Here, the corrosion-resistant film refers to a thin film that, for example, performs a hot water conversion treatment such as boehmite treatment, chemical conversion treatment, anodizing treatment, plating treatment such as nickel or chromium, or a corrosion prevention treatment of applying a coating agent on the surface of the metal layer to provide the metal layer with corrosion resistance (e.g., acid resistance, alkali resistance, etc.). Specifically, the corrosion-resistant film means a film that improves the acid resistance of the metal layer (acid-resistant film), a film that improves the alkali resistance of the metal layer (alkali-resistant film), and the like. As the treatment for forming the corrosion-resistant film, one type may be performed, or two or more types may be combined. Also, it can be made into multiple layers instead of just one layer. Furthermore, among these treatments, the hot water conversion treatment and the anodizing treatment are treatments that dissolve the surface of the metal foil with a treatment agent to form a metal compound with excellent corrosion resistance. Note that these treatments may be included in the definition of chemical conversion treatment. In the present disclosure, when the surface of the metal layer 1 is provided with a corrosion-resistant film, the metal layer 1 includes the corrosion-resistant film.

[0042] The corrosion-resistant film prevents delamination between the metal layer 1 (e.g., aluminum alloy foil) and the adjacent layer (e.g., heat-fusible resin layer 2, adhesive layer 3, resin layer 4, etc.) on the side of the heat-fusible resin layer 2, prevents dissolution and corrosion of the surface of the metal layer 1 due to moisture derived from the contents of the partition member, particularly prevents dissolution and corrosion of aluminum oxide present on the surface of the metal layer when the metal layer is an aluminum alloy foil, and improves the adhesiveness (wettability) of the metal layer surface, showing the effect of preventing delamination between the metal layer and the adjacent layer.

[0043] As the corrosion-resistant film formed by chemical conversion treatment, various types are known, and mainly include corrosion-resistant films containing at least one of phosphates, chromates, fluorides, triazine thiol compounds, and rare earth oxides. Examples of chemical conversion treatments using phosphates and chromates include chromic acid chromate treatment, phosphoric acid chromate treatment, phosphate-chromate treatment, chromate treatment, etc. Examples of chromium compounds used in these treatments include chromium nitrate, chromium fluoride, chromium sulfate, chromium acetate, chromium oxalate, dichromic acid chromium, acetylacetate chromium, chromium chloride, potassium sulfate chromium, etc. Examples of phosphorus compounds used in these treatments include sodium phosphate, potassium phosphate, ammonium phosphate, polyphosphoric acid, etc. Examples of chromate treatments include etching chromate treatment, electrolytic chromate treatment, coating type chromate treatment, etc., and the coating type chromate treatment is preferred. This coating type chromate treatment first degreases at least the inner layer side surface of the metal layer (for example, aluminum alloy foil) by well-known treatment methods such as alkali immersion method, electrolytic cleaning method, acid cleaning method, electrolytic acid cleaning method, acid activation method, etc. Then, a treatment liquid mainly composed of metal phosphates such as chromium (Cr) phosphate, titanium (Ti) phosphate, zirconium (Zr) phosphate, zinc (Zn) phosphate, etc. and mixtures of these metal salts, or a treatment liquid mainly composed of non-metal phosphates and mixtures of these non-metal salts, or a treatment liquid composed of a mixture of these and synthetic resin, etc. is applied by well-known coating methods such as roll coating method, gravure printing method, dipping method, etc. and dried. For the treatment liquid, various solvents such as water, alcohol-based solvents, hydrocarbon-based solvents, ketone-based solvents, ester-based solvents, ether-based solvents, etc. can be used, and water is preferred. Examples of the resin component used at this time include polymers such as phenolic resins and acrylic resins, and chromate treatments using aminoated phenol polymers having repeating units represented by the following general formulas (1) to (4) can be mentioned. In the aminoated phenol polymer, the repeating units represented by the following general formulas (1) to (4) may be included alone or in any combination of two or more types.The acrylic resin is preferably a derivative of polyacrylic acid, an acrylic acid-methacrylic acid ester copolymer, an acrylic acid-maleic acid copolymer, an acrylic acid-styrene copolymer, or their sodium salts, ammonium salts, amine salts, etc. In particular, derivatives of polyacrylic acid such as ammonium salts, sodium salts, or amine salts of polyacrylic acid are preferred. In the present disclosure, polyacrylic acid means a polymer of acrylic acid. Further, the acrylic resin is also preferably a copolymer of acrylic acid and a dicarboxylic acid or dicarboxylic anhydride, and is also preferably an ammonium salt, a sodium salt, or an amine salt of a copolymer of acrylic acid and a dicarboxylic acid or dicarboxylic anhydride. Only one type of acrylic resin may be used, or two or more types may be mixed and used.

[0044]

Chemical formula

[0045]

Chemical formula

[0046]

Chemical formula

[0047]

Chemical formula

[0048] In general formulas (1) to (4), X represents a hydrogen atom, a hydroxy group, an alkyl group, a hydroxyalkyl group, an allyl group, or a benzyl group. Also, R 1 and R 2 each independently represent a hydroxy group, an alkyl group, or a hydroxyalkyl group. In general formulas (1) to (4), X, R 1 and R 2Examples of the alkyl group represented by [alkyl group] include linear or branched alkyl groups having 1 to 4 carbon atoms such as methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, and tert-butyl group. Also, X, R 1 and R 2 Examples of the hydroxyalkyl group represented by [hydroxyalkyl group] include linear or branched alkyl groups having 1 to 4 carbon atoms with one hydroxy group substituted, such as hydroxymethyl group, 1-hydroxyethyl group, 2-hydroxyethyl group, 1-hydroxypropyl group, 2-hydroxypropyl group, 3-hydroxypropyl group, 1-hydroxybutyl group, 2-hydroxybutyl group, 3-hydroxybutyl group, and 4-hydroxybutyl group. In general formulas (1) to (4), the alkyl groups and hydroxyalkyl groups represented by X, R 1 and R 2 may be the same or different from each other. In general formulas (1) to (4), X is preferably a hydrogen atom, a hydroxy group, or a hydroxyalkyl group. The number average molecular weight of the aminated phenol polymer having the repeating units represented by general formulas (1) to (4) is preferably about 500 to 1,000,000, and more preferably about 1,000 to 20,000. The aminated phenol polymer is produced, for example, by polycondensing a phenol compound or a naphthol compound and formaldehyde to produce a polymer composed of the repeating units represented by the above general formula (1) or general formula (3), and then introducing a functional group (-CH2NR 1 R 2 ) into the polymer obtained above using formaldehyde and an amine (R 1 R 2 NH). The aminated phenol polymer is used alone or in a mixture of two or more.

[0049] As another example of the corrosion-resistant film, there is a thin film formed by a coating-type corrosion prevention treatment in which a coating agent containing at least one selected from the group consisting of rare earth element oxides sols, anionic polymers, and cationic polymers is applied. The coating agent may further contain phosphoric acid or a phosphate and a cross-linking agent for cross-linking the polymer. In the rare earth element oxide sol, fine particles of a rare earth element oxide (for example, particles having an average particle diameter of 100 nm or less) are dispersed in a liquid dispersion medium. Examples of the rare earth element oxide include cerium oxide, yttrium oxide, neodymium oxide, lanthanum oxide, etc., and cerium oxide is preferable from the viewpoint of further improving the adhesion. The rare earth element oxide contained in the corrosion-resistant film can be used alone or in combination of two or more. As the liquid dispersion medium of the rare earth element oxide sol, for example, various solvents such as water, alcohol solvents, hydrocarbon solvents, ketone solvents, ester solvents, and ether solvents can be used, and water is preferable. Examples of the cationic polymer include polyethyleneimine, an ion polymer complex composed of polyethyleneimine and a polymer having a carboxylic acid, a primary amine graft acrylic resin obtained by graft polymerizing a primary amine onto an acrylic main skeleton, polyallylamine or its derivative, and aminated phenol. Further, as the anionic polymer, it is preferably poly(meth)acrylic acid or its salt, or a copolymer having (meth)acrylic acid or its salt as a main component. Further, it is preferable that the cross-linking agent is at least one selected from the group consisting of a compound having any functional group of an isocyanate group, a glycidyl group, a carboxyl group, and an oxazoline group and a silane coupling agent. Further, it is preferable that the phosphoric acid or the phosphate is a condensed phosphoric acid or a condensed phosphate.

[0050] As an example of the corrosion-resistant film, there is one formed by applying, to the surface of a metal layer, a material in which fine particles of metal oxides such as aluminum oxide, titanium oxide, cerium oxide, and tin oxide and barium sulfate are dispersed in phosphoric acid and performing a baking treatment at 150 °C or higher.

[0051] The corrosion-resistant film may, if necessary, have a laminated structure in which at least one of a cationic polymer and an anionic polymer is further laminated. Examples of the cationic polymer and the anionic polymer include those described above.

[0052] In addition, the analysis of the composition of the corrosion-resistant film can be carried out, for example, using time-of-flight secondary ion mass spectrometry. Further, as described later, in the present disclosure, X-ray photoelectron analysis is used for the detection of Cr, Zr, etc. in the corrosion-resistant film.

[0053] From the viewpoint of more preferably exhibiting the effects of the present disclosure, in the corrosion-resistant film formed on the surface of the heat-fusible resin layer 2 side of the metal layer 1, the atomic composition ratio of Cr or Zr is preferably detected by X-ray photoelectron analysis to be 0.1 at% or more, more preferably 0.3 at% or more, and even more preferably 1.0 at% or more. Regarding the upper limit of the atomic composition ratio of Cr or Zr, for example, it is 20 at% or less, more preferably 15 at% or less, and even more preferably 10 at% or less. Preferred ranges of the atomic composition ratio include about 0.1 to 20 at%, about 0.1 to 15 at%, about 0.1 to 10 at%, about 0.3 to 20 at%, about 0.3 to 15 at%, about 0.3 to 10 at%, about 1.0 to 20 at%, about 1.0 to 15 at%, about 1.0 to 10 at%, and the like. The atomic composition ratio of Cr or Zr refers to the atomic number ratio of Cr or Zr atoms when the total number of C atoms, N atoms, O atoms, F atoms, Al atoms, Si atoms, P atoms, S atoms, Cr atoms, and Zr atoms on the surface of the corrosion-resistant film measured by X-ray photoelectron spectroscopy (XPS) is 100 at%. Among the chemical conversion treatments described above, for example, when a corrosion-resistant film is formed using a treatment liquid containing Cr (chromium) phosphate or Zr (zirconium) phosphate as a main component, a corrosion-resistant film in which Cr or Zr is detected at 0.1 at% or more can be formed. Also, for the surface on the side opposite to the heat-fusible resin layer 2 side of the metal layer 1, when a corrosion-resistant film is formed, the atomic composition ratio of Cr or Zr by X-ray photoelectron analysis is preferably these detected amounts. The XPS analysis of the corrosion-resistant film formed on the surface of the metal layer is carried out under the following conditions.

[0054] [XPS Analysis of Corrosion-Resistant Film] Under the following measurement conditions, X-ray photoelectron spectroscopy (XPS analysis) was performed on the surface of the corrosion-resistant film formed on the surface of the metal layer, and the atomic composition ratio (at%) of each element was measured. [Measurement Conditions] · Equipment used: Scanning X-ray photoelectron spectrometer · Spectrum acquisition conditions Incident X-ray: AlKα (monochromatic X-ray, hν = 1486.6 eV) X-ray output: 50 W (15 kV·3.3 mA) X-ray beam diameter: 200 μmφ X-ray scanning: 700 μm × 200 μm (surface XPS analysis) Photoelectron capture angle: 45 degrees Charge neutralization: Electron neutralization gun, low-acceleration ion irradiation · Low-speed electron irradiation conditions... Emission 10 μA, bias potential 1.0 V · Low-acceleration ion irradiation conditions... Ion species Ar+, acceleration voltage 0.11 kV, emission 7 mA

[0055] In addition, for the corrosion-resistant film formed on the surface of the metal layer 1, elements detected other than Cr and Zr include, for example, elements such as C, N, and O, and furthermore, elements such as F, Al, Si, P, and S may also be detected.

[0056] The amount of the corrosion-resistant film formed on the surface of the metal layer 1 in the chemical conversion treatment is not particularly limited. For example, in the case of performing a coating type chromate treatment, per 1 m 2 of the surface of the metal layer 1, it is desirable that the chromic acid compound is about 0.5 to 50 mg in terms of chromium conversion, preferably about 1.0 to 40 mg, the phosphorus compound is about 0.5 to 50 mg in terms of phosphorus conversion, preferably about 1.0 to 40 mg, and the aminophenol polymer is about 1.0 to 200 mg, preferably about 5.0 to 150 mg.

[0057] The thickness of the corrosion-resistant film is not particularly limited, but from the viewpoints of the cohesion of the film and the adhesion to the metal layer or the heat-fusible resin layer, it is preferably 1 nm or more, more preferably 5 nm or more, still more preferably 10 nm or more, and is preferably 100 nm or less, more preferably 50 nm or less, still more preferably 40 nm or less. Preferred ranges include about 1 to 100 nm, about 1 to 50 nm, about 1 to 40 nm, about 5 to 100 nm, about 5 to 50 nm, about 5 to 40 nm, about 10 to 100 nm, about 10 to 50 nm, about 10 to 40 nm. The thickness of the corrosion-resistant film can be measured by observation with a transmission electron microscope or a combination of observation with a transmission electron microscope and energy-dispersive X-ray spectroscopy or electron energy loss spectroscopy. By analyzing the composition of the corrosion-resistant film using time-of-flight secondary ion mass spectrometry, for example, peaks derived from at least one secondary ion composed of Cr, P, and O (e.g., CrPO2 + , CrPO4 - etc.) are detected.

[0058] The chemical conversion treatment is carried out by applying a solution containing a compound used for forming the corrosion-resistant film onto the surface of the metal layer by a bar coating method, a roll coating method, a gravure coating method, a dipping method, etc., and then heating so that the temperature of the metal layer becomes about 70 to 200°C. Also, before subjecting the metal layer to the chemical conversion treatment, the metal layer may be previously subjected to a degreasing treatment by an alkali dipping method, an electrolytic cleaning method, an acid cleaning method, an electrolytic acid cleaning method, etc. By performing the degreasing treatment in this way, it becomes possible to perform the chemical conversion treatment on the surface of the metal layer more efficiently. Also, by using an acid degreasing agent in which a fluorine-containing compound is dissolved in an inorganic acid for the degreasing treatment, it is possible to form not only the degreasing effect of the metal foil but also a fluoride of a passive metal. In such a case, only the degreasing treatment may be performed.

[0059] [Heat-fusible resin layer 2] In the exterior material for the partition member of the present disclosure, the heat-sealable resin layer 2 corresponds to the innermost layer. When manufacturing a partition member using the exterior material for the partition member of the present disclosure, the heat-sealable resin layer 2 functions as a layer (sealant layer) in which the heat-sealable resin layers 2 are heat-sealed to seal the contents (for example, coolant). When sealing the contents (for example, coolant) of the partition member using the exterior material for the partition member, the heat-sealable resin layer 2 comes into contact with the contents of the partition member and is joined at the ends of the opposing exterior materials for the partition members.

[0060] The resin constituting the heat-sealable resin layer 2 is not particularly limited as long as it is heat-sealable, but resins containing a polyolefin backbone such as polyolefin and acid-modified polyolefin are preferred. Whether the resin constituting the heat-sealable resin layer 2 contains a polyolefin backbone can be analyzed, for example, by infrared spectroscopy, gas chromatography-mass spectrometry, etc. Further, when analyzing the resin constituting the heat-sealable resin layer 2 by infrared spectroscopy, it is preferable that a peak derived from maleic anhydride is detected. For example, when measuring maleic anhydride-modified polyolefin by infrared spectroscopy, peaks derived from maleic anhydride are detected in the vicinity of a wave number of 1760 cm -1 and in the vicinity of a wave number of 1780 cm -1 . When the heat-sealable resin layer 2 is a layer composed of maleic anhydride-modified polyolefin, peaks derived from maleic anhydride are detected when measured by infrared spectroscopy. However, if the degree of acid modification is low, the peak may become small and not be detected. In that case, it can be analyzed by nuclear magnetic resonance spectroscopy.

[0061] The heat-sealable resin layer 2 preferably contains a resin containing a polyolefin backbone as a main component, more preferably contains a polyolefin as a main component, and even more preferably contains polypropylene as a main component. Here, the main component means a resin component having a content of, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably 99% by mass or more among the resin components contained in the heat-sealable resin layer 2. For example, when the heat-sealable resin layer 2 contains polypropylene as a main component, it means that the content of polypropylene among the resin components contained in the heat-sealable resin layer 2 is, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably 99% by mass or more.

[0062] Specific examples of the polyolefin include polyethylene such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, and linear low-density polyethylene; ethylene-α-olefin copolymers; polypropylene such as homopolypropylene, block copolymers of polypropylene (e.g., block copolymers of propylene and ethylene), and random copolymers of polypropylene (e.g., random copolymers of propylene and ethylene); propylene-α-olefin copolymers; and terpolymers of ethylene-butene-propylene. Among these, polypropylene is preferred. The polyolefin resin in the case of a copolymer may be a block copolymer or a random copolymer. These polyolefin-based resins may be used alone or in combination of two or more.

[0063] Further, the polyolefin may be a cyclic polyolefin. The cyclic polyolefin is a copolymer of an olefin and a cyclic monomer. Examples of the olefin that is a constituent monomer of the cyclic polyolefin include ethylene, propylene, 4-methyl-1-pentene, styrene, butadiene, isoprene, and the like. Examples of the cyclic monomer that is a constituent monomer of the cyclic polyolefin include cyclic alkenes such as norbornene; cyclic dienes such as cyclopentadiene, dicyclopentadiene, cyclohexadiene, and norbornadiene. Among these, cyclic alkenes are preferred, and norbornene is more preferred.

[0064] Further, the polyolefin may be an acid-modified polyolefin. The acid-modified polyolefin is a polymer obtained by block polymerization or graft polymerization of a polyolefin with an acid component. As the polyolefin to be acid-modified, the above-mentioned polyolefin, a copolymer obtained by copolymerizing a polar molecule such as acrylic acid or methacrylic acid with the above-mentioned polyolefin, or a polymer such as a crosslinked polyolefin can also be used. Examples of the acid component used for acid modification include carboxylic acids such as maleic acid, acrylic acid, itaconic acid, crotonic acid, maleic anhydride, and itaconic anhydride, or their anhydrides.

[0065] The acid-modified polyolefin may be an acid-modified cyclic polyolefin. The acid-modified cyclic polyolefin is a polymer obtained by copolymerizing a part of the monomers constituting the cyclic polyolefin by replacing them with an acid component, or by block polymerization or graft polymerization of an acid component onto the cyclic polyolefin. The cyclic polyolefin to be acid-modified is the same as described above. Also, the acid component used for acid modification is the same as the acid component used for modification of the above-mentioned polyolefin.

[0066] Preferred acid-modified polyolefins include polyolefins modified with carboxylic acid or its anhydride, polypropylenes modified with carboxylic acid or its anhydride, maleic anhydride-modified polyolefins, and maleic anhydride-modified polypropylenes.

[0067] The thermally adhesive resin layer 2 may be formed of one type of resin alone or may be formed of a blend polymer of two or more types of resins. Furthermore, the thermally adhesive resin layer 2 may be formed of only one layer, or may be formed of two or more layers of the same or different resins.

[0068] When the heat-sealable resin layer 2 is laminated with the metal layer 1, the adhesive layer 3, or the like to produce the exterior material 10 for partition members of the present disclosure, a pre-formed resin film may be used as the heat-sealable resin layer 2. Alternatively, the heat-sealable resin that forms the heat-sealable resin layer 2 may be formed into a film on the surface of the metal layer 1, the adhesive layer 3, or the like by extrusion molding, coating, or the like, to form the heat-sealable resin layer 2 formed from a resin film.

[0069] The heat-fusible resin layer 2 may contain additives such as an anti-blocking agent, a lubricant, a flame retardant, and a filler.

[0070] The melting point of the heat-sealing resin layer 2 is preferably, for example, 120°C or higher, more preferably 130°C or higher, and even more preferably 140°C or higher, depending on the material. Here, in a structure in which a partition member is disposed between a plurality of heating elements, when any one of the heating elements generates abnormal heat, heat is released from the heating element, so that the temperature of the partition member located in the vicinity of the heating element rises. At this time, if the temperature of the partition member exceeds the melting point of the heat-sealing resin layer, the heat-sealing resin layer melts, and the sealing portion of the exterior material for the partition member is likely to peel off. Further, as the temperature of the partition member rises, the temperature of the content (for example, a coolant containing water) enclosed in the partition member rises, so that the vapor pressure of the content rises, causing an increase in the internal pressure of the partition member. At this time, if the internal pressure of the partition member exceeds the welding strength of the heat-sealing resin layer at the sealing portion of the exterior material for the partition member, the sealing portion of the exterior material for the partition member is likely to peel off. Further, as will be described later, the coolant preferably contains water. Therefore, if the melting point of the heat-sealing resin layer is within the above range, it is possible to suppress the peeling of the sealing portion of the exterior material for the partition member during normal operation in the above structure.

[0071] On the other hand, the melting point of the heat-sealing resin layer is preferably, for example, 250°C or lower, more preferably 200°C or lower, and even more preferably 170°C or lower. If the melting point of the heat-sealing resin layer is within the above range, in the above structure, the sealing portion of the exterior material for the partition member is likely to peel off during abnormal heat generation. When the sealing portion of the exterior material for the partition member peels off and the coolant is released from the partition member, the abnormal heating element can be cooled. Thereby, thermal runaway can be suppressed.

[0072] Here, the melting point of the heat-sealable resin layer is measured by the following method using a differential scanning calorimeter (DSC). First, the heat-sealable resin layer is peeled off from the exterior material for the partition member to obtain a sample of about 10 mg. This sample is placed in an aluminum cell, and using a differential scanning calorimeter, the temperature is raised from 20°C to 300°C at a heating rate of 10°C / min under a nitrogen atmosphere and held at that temperature for 10 minutes. Further, it is cooled to 20°C at a cooling rate of 10°C / min, held at that temperature for 10 minutes, and then the temperature is raised again to 300°C at a heating rate of 10°C / min (second heating). The intersection of the tangent line at the melting point observed during the second heating and the baseline of the DSC curve on the lower temperature side than the above melting point is defined as the melting point of the heat-sealable resin layer.

[0073] Further, the heat-sealable resin layer 2 may contain additives such as lubricants, antiblocking agents, lubricants, flame retardants, fillers, etc. as required. When the heat-sealable resin layer 2 contains a lubricant, the followability of the exterior material for the partition member can be enhanced. The lubricant is not particularly limited, and known lubricants can be used.

[0074] The lubricant is not particularly limited, but preferably includes amide-based lubricants. Specific examples of the lubricant include those exemplified in the protective layer 6. The lubricant may be used alone or in combination of two or more, and it is preferable to use a combination of two or more.

[0075] In the present disclosure, from the viewpoint of enhancing the followability of the exterior material for the partition member, it is preferable that a lubricant is present on at least one of the surface and the interior of the heat-sealable resin layer 2. The lubricant is not particularly limited, but preferably an amide-based lubricant. Specific examples of the amide-based lubricant include, for example, saturated fatty acid amides, unsaturated fatty acid amides, substituted amides, methylol amides, saturated fatty acid bisamides, unsaturated fatty acid bisamides, fatty acid ester amides, aromatic bisamides, and the like. Specific examples of the saturated fatty acid amides include lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, hydroxystearic acid amide, and the like. Specific examples of the unsaturated fatty acid amides include oleic acid amide, erucic acid amide, and the like. Specific examples of the substituted amides include N-oleyl palmitic acid amide, N-stearyl stearic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucic acid amide, and the like. Further, specific examples of the methylol amides include methylol stearic acid amide, and the like. Specific examples of the saturated fatty acid bisamides include methylene bisstearic acid amide, ethylene biscapric acid amide, ethylene bislauric acid amide, ethylene bisstearic acid amide, ethylene bishydroxystearic acid amide, ethylene bisbehenic acid amide, hexamethylene bisstearic acid amide, hexamethylene bisbehenic acid amide, hexamethylene hydroxystearic acid amide, N,N'-distearyl adipic acid amide, N,N'-distearyl sebacic acid amide, and the like. Specific examples of the unsaturated fatty acid bisamides include ethylene bisoleic acid amide, ethylene biserucic acid amide, hexamethylene bisoleic acid amide, N,N'-dioleyl adipic acid amide, N,N'-dioleyl sebacic acid amide, and the like. Specific examples of the fatty acid ester amides include stearamide ethyl stearate, and the like. Further, specific examples of the aromatic bisamides include m-xylylene bisstearic acid amide, m-xylylene bishydroxystearic acid amide, N,N'-distearyl isophthalic acid amide, and the like.The lubricant may be used alone or in combination of two or more kinds, and it is preferable to use two or more kinds in combination.

[0076] When the lubricant is present on the surface of the heat-sealable resin layer 2, its amount of presence is not particularly limited, but from the viewpoint of enhancing the followability of the exterior material for the partition member, it is preferably about 1 mg / m 2 or more, more preferably about 3 mg / m 2 or more, still more preferably about 5 mg / m 2 or more, still more preferably about 10 mg / m 2 or more, still more preferably about 15 mg / m 2 or more, and preferably about 50 mg / m 2 or less, more preferably about 40 mg / m 2 or less. The preferable range is about 1 to 50 mg / m 2 level, about 1 to 40 mg / m 2 level, about 3 to 50 mg / m 2 level, about 3 to 40 mg / m 2 level, about 5 to 50 mg / m 2 level, about 5 to 40 mg / m 2 level, about 10 to 50 mg / m 2 level, about 10 to 40 mg / m 2 level, about 15 to 50 mg / m 2 level, about 15 to 40 mg / m 2 level and the like can be mentioned.

[0077] When a lubricant is present inside the heat-sealing resin layer 2, its amount of presence is not particularly limited. However, from the viewpoint of enhancing the followability of the exterior material for the partition member, it is preferably about 100 ppm or more, more preferably about 300 ppm or more, still more preferably about 500 ppm or more. Also, it is preferably about 3000 ppm or less, more preferably about 2000 ppm or less. Preferred ranges include about 100 to 3000 ppm, about 100 to 2000 ppm, about 300 to 3000 ppm, about 300 to 2000 ppm, about 500 to 3000 ppm, and about 500 to 2000 ppm. When two or more types of lubricants are present inside the heat-sealing resin layer 2, the above amount of lubricant is the total amount of lubricants. Further, when two or more types of lubricants are present inside the heat-sealing resin layer 2, the amount of presence of the first type of lubricant is not particularly limited. However, from the viewpoint of enhancing the followability of the exterior material for the partition member, it is preferably about 100 ppm or more, more preferably about 300 ppm or more, still more preferably about 500 ppm or more. Also, it is preferably about 3000 ppm or less, more preferably about 2000 ppm or less. Preferred ranges include about 100 to 3000 ppm, about 100 to 2000 ppm, about 300 to 3000 ppm, about 300 to 2000 ppm, about 500 to 3000 ppm, and about 500 to 2000 ppm. The amount of presence of the second type of lubricant is not particularly limited. However, from the viewpoint of enhancing the followability of the exterior material for the partition member, it is preferably about 50 ppm or more, more preferably about 100 ppm or more, still more preferably about 200 ppm or more. Also, it is preferably about 1500 ppm or less, more preferably about 1000 ppm or less. Preferred ranges include about 50 to 1500 ppm, about 50 to 1000 ppm, about 100 to 1500 ppm, about 100 to 1000 ppm, about 200 to 1500 ppm, and about 200 to 1000 ppm.

[0078] The lubricant present on the surface of the heat-sealing resin layer 2 may be one obtained by exuding the lubricant contained in the resin constituting the heat-sealing resin layer 2, or may be one with a lubricant applied to the surface of the heat-sealing resin layer 2.

[0079] Also, the thickness of the heat-sealable resin layer 2 is not particularly limited as long as the heat-sealable resin layers can exhibit the function of heat-sealing to seal the contents. For example, it is about 100 μm or less, preferably about 85 μm or less, and more preferably about 15 to 85 μm. For example, when the thickness of the adhesive layer 5 described later is 10 μm or more, the thickness of the heat-sealable resin layer 2 is preferably about 85 μm or less, and more preferably about 15 to 45 μm. For example, when the thickness of the adhesive layer 5 described later is less than 10 μm or when the adhesive layer 5 is not provided, the thickness of the heat-sealable resin layer 2 is preferably about 20 μm or more, and more preferably about 35 to 85 μm.

[0080] [Adhesive layer 3] For example, as shown in FIGS. 1 to 4, the exterior material 10 for the partition member of the present disclosure has an adhesive layer 3 between the metal layer 1 and the heat-sealable resin layer 2. The adhesive layer 3 is a layer that contacts the metal layer 1 inside the metal layer 1 and enhances the adhesive force between the metal layer 1 and the layer inside the metal layer 1 (such as the heat-sealable resin layer 2 and the resin layer 4). When there is a resin layer 4 described later between the metal layer 1 and the heat-sealable resin layer 2, the adhesive layer 3 is provided between the metal layer 1 and the resin layer 4 and bonds these layers. The adhesive layer 3 may be a single layer or a multilayer.

[0081] The adhesive layer 3 is formed of an adhesive capable of bonding the metal layer 1 and the adjacent layer. In the present disclosure, the adhesive layer 3 is formed of a cured product of a polyolefin-based adhesive. That is, the resin used for forming the adhesive layer 3 contains a polyolefin backbone. Also, the resin serving as the adhesive component of the adhesive layer 3 can enhance the adhesive strength by using an appropriate curing agent in combination. The curing agent is appropriately selected from polyisocyanates, polyfunctional epoxy resins, oxazoline group-containing polymers, polyamine resins, acid anhydrides, etc., according to the functional groups of the adhesive component.

[0082] In the subsequent layer 3, examples of the resin containing a polyolefin backbone include the polyolefins, acid-modified polyolefins, cyclic polyolefins, and acid-modified cyclic polyolefins exemplified in the above-described heat-sealable resin layer 2. On the other hand, from the viewpoint of firmly adhering the metal layer 1 and the layer adjacent thereto, the adhesive layer 3 preferably contains an acid-modified polyolefin. Examples of the acid-modifying component include dicarboxylic acids such as maleic acid, itaconic acid, succinic acid, and adipic acid, anhydrides thereof, acrylic acid, methacrylic acid, etc. Among these, maleic anhydride is most preferred in terms of ease of modification and versatility. Further, from the viewpoint of the heat resistance of the exterior material for the partition member, the olefin component is preferably a polypropylene-based resin, and the adhesive layer 3 most preferably contains maleic anhydride-modified polypropylene.

[0083] When the resin used for forming the adhesive layer 3 contains a polyolefin backbone, the adhesive layer 3 preferably contains, as a main component, a resin containing a polyolefin backbone, more preferably contains, as a main component, an acid-modified polyolefin, and even more preferably contains, as a main component, an acid-modified polypropylene. Here, the main component means a resin component having a content of, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, even more preferably 99% by mass or more among the resin components contained in the adhesive layer 3. For example, when the adhesive layer 3 contains an acid-modified polypropylene as a main component, it means that the content of the acid-modified polypropylene among the resin components contained in the adhesive layer 3 is, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, even more preferably 99% by mass or more.

[0084] The presence of a polyolefin skeleton in the resin constituting the adhesive layer 3 can be determined by, for example, infrared spectroscopy, gas chromatography mass spectrometry, or the like, and the analysis method is not particularly limited. Furthermore, the presence of an acid-modified polyolefin in the resin constituting the adhesive layer 3 can be determined by, for example, measuring a maleic anhydride-modified polyolefin by infrared spectroscopy, and finding a peak at a wave number of 1760 cm -1 Near and wave number 1780cm -1 A peak derived from maleic anhydride is detected around this point. However, if the degree of acid modification is low, the peak may be small and not be detected. In this case, analysis can be performed using nuclear magnetic resonance spectroscopy.

[0085] Furthermore, from the viewpoint of ensuring durability such as heat resistance and resistance to contents of the partition member exterior material, and of ensuring conformability while reducing the thickness, it is more preferable that the adhesive layer 3 is a cured product of a resin composition containing an acid-modified polyolefin and a curing agent. Preferred examples of the acid-modified polyolefin include those mentioned above.

[0086] The adhesive layer 3 is preferably a cured product of a resin composition containing an acid-modified polyolefin and at least one selected from the group consisting of a compound having an isocyanate group, a compound having an oxazoline group, and a compound having an epoxy group. It is particularly preferably a cured product of a resin composition containing an acid-modified polyolefin and at least one selected from the group consisting of a compound having an isocyanate group and a compound having an epoxy group. The adhesive layer 3 also preferably contains at least one selected from the group consisting of polyurethane, polyester, and epoxy resin, and more preferably polyurethane and epoxy resin. Examples of polyesters include ester resins formed by the reaction of epoxy groups with maleic anhydride groups, and amide ester resins formed by the reaction of oxazoline groups with maleic anhydride groups. If unreacted components of a curing agent, such as a compound having an isocyanate group, a compound having an oxazoline group, or an epoxy resin, remain in the adhesive layer 3, the presence of the unreacted components can be confirmed by a method selected from the group consisting of infrared spectroscopy, Raman spectroscopy, time-of-flight secondary ion mass spectrometry (TOF-SIMS), and the like.

[0087] Also, from the viewpoint of further enhancing the adhesion between the metal layer 1 and the adhesive layer 3, the adhesive layer 3 is preferably a cured product of a resin composition containing a curing agent having at least one selected from the group consisting of an oxygen atom, a heterocyclic ring, a C═N bond, and a C—O—C bond. Examples of the curing agent having a heterocyclic ring include a curing agent having an oxazoline group and a curing agent having an epoxy group. Examples of the curing agent having a C═N bond include a curing agent having an oxazoline group and a curing agent having an isocyanate group. Examples of the curing agent having a C—O—C bond include a curing agent having an oxazoline group and a curing agent having an epoxy group. Whether the adhesive layer 3 is a cured product of a resin composition containing these curing agents can be confirmed by methods such as gas chromatography-mass spectrometry (GCMS), infrared spectroscopy (IR), time-of-flight secondary ion mass spectrometry (TOF-SIMS), and X-ray photoelectron spectroscopy (XPS).

[0088] The compound having an isocyanate group is not particularly limited, but from the viewpoint of effectively enhancing the adhesion between the metal layer 1 and the adhesive layer 3, a polyfunctional isocyanate compound is preferably used. The polyfunctional isocyanate compound is not particularly limited as long as it has two or more isocyanate groups. Specific examples of the polyfunctional isocyanate-based curing agent include pentane diisocyanate (PDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), those obtained by polymerizing or nurating these, mixtures thereof, and copolymers with other polymers. Also, adducts, biurets, isocyanurates, etc. can be mentioned.

[0089] The content of the compound having an isocyanate group in the adhesive layer 3 is preferably in the range of 0.1 to 50% by mass, more preferably in the range of 0.5 to 40% by mass, in the resin composition constituting the adhesive layer 3. Thereby, the adhesion between the metal layer 1 and the adhesive layer 3 can be effectively enhanced.

[0090] The compound having an oxazoline group is not particularly limited as long as it is a compound having an oxazoline skeleton. Specific examples of the compound having an oxazoline group include those having a polystyrene main chain and those having an acrylic main chain. As commercially available products, for example, the Epocros series manufactured by Nippon Shokubai Co., Ltd. can be mentioned.

[0091] The proportion of the compound having an oxazoline group in the adhesive layer 3 is preferably in the range of 0.1 to 50% by mass, more preferably in the range of 0.5 to 40% by mass, in the resin composition constituting the adhesive layer 3. Thereby, the adhesiveness between the metal layer 1 and the adhesive layer 3 can be effectively enhanced.

[0092] Examples of the compound having an epoxy group include epoxy resins. The epoxy resin is not particularly limited as long as it is a resin capable of forming a crosslinked structure by the epoxy groups present in the molecule, and known epoxy resins can be used. The weight average molecular weight of the epoxy resin is preferably about 50 to 2000, more preferably about 100 to 1000, and even more preferably about 200 to 800. In the present disclosure, the weight average molecular weight of the epoxy resin is a value measured by gel permeation chromatography (GPC) measured under the condition of using polystyrene as a standard sample.

[0093] Specific examples of the epoxy resin include glycidyl ether derivatives of trimethylolpropane, bisphenol A diglycidyl ether, modified bisphenol A diglycidyl ether, bisphenol F type glycidyl ether, novolak glycidyl ether, glycerin polyglycidyl ether, polyglycerin polyglycidyl ether, and the like. The epoxy resin may be used alone or in combination of two or more.

[0094] The proportion of the epoxy resin in the adhesive layer 3 is preferably in the range of 0.1 to 50 mass %, and more preferably in the range of 0.5 to 40 mass %, of the resin composition constituting the adhesive layer 3. This can effectively improve the adhesion between the metal layer 1 and the adhesive layer 3.

[0095] The adhesive layer 3 may contain other ingredients as long as they do not impair adhesiveness, such as colorants, thermoplastic elastomers, tackifiers, and fillers.

[0096] The thickness of adhesive layer 3 is not particularly limited as long as it can bond metal layer 1 to an adjacent layer, but is, for example, about 1 μm or more, or about 2 μm or more. Also, the thickness of adhesive layer 3 is, for example, about 10 μm or less, or about 5 μm or less. Preferred ranges for the thickness of adhesive layer 3 include about 1 to 10 μm, about 1 to 5 μm, about 2 to 10 μm, and about 2 to 5 μm.

[0097] [Resin layer 4] In the present disclosure, as shown in, for example, Figures 2 to 4, the exterior packaging material 10 for partition members may have a resin layer 4 between the metal layer 1 and the heat-sealable resin layer 2, as necessary. When the resin layer 4 is present between the metal layer 1 and the heat-sealable resin layer 2, the metal layer 1 and the resin layer 4 may be directly laminated together, or an adhesive layer 3 may be present between the metal layer 1 and the resin layer 4. Furthermore, the resin layer 4 and the heat-sealable resin layer 2 may be directly laminated together, or an adhesive layer 5 may be present between the resin layer 4 and the heat-sealable resin layer 2.

[0098] When the resin layer 4 is provided between the metal layer 1 and the heat-sealable resin layer 2, it is possible to suppress the penetration of water and the like from the contents into the metal layer 1. Therefore, when the partition member exterior material is used as a partition member, it is possible to further suppress the expansion of the partition member. However, in the partition member exterior material of the present disclosure, since the surface of the metal layer 1 facing the heat-sealable resin layer 2 is provided with a corrosion-resistant coating, corrosion of the metal layer 1 by water and the like is suppressed, and the resin layer 4 may be provided as needed.

[0099] The resin for forming the resin layer 4 is not particularly limited, and examples thereof include the resin for forming the resin base material described above, or the resin for forming the protective layer described below.

[0100] The thickness of the resin layer 4 is not particularly limited as long as the effects of the present disclosure are achieved. For example, it is about 6 μm or more, preferably about 10 μm or more, more preferably about 12 μm or more, and for example, about 200 μm or less, preferably about 50 μm or less, more preferably about 35 μm or less. Preferred ranges include about 6 to 200 μm, about 6 to 50 μm, about 6 to 35 μm, about 10 to 200 μm, about 10 to 50 μm, about 10 to 35 μm, about 12 to 200 μm, about 12 to 50 μm, and about 12 to 35 μm.

[0101] [Adhesive layer 5] The adhesive layer 5 is a layer provided as needed to bond the resin layer 4 and the heat-fusible resin layer 2 when the exterior material 10 for the partition member of the present disclosure includes the resin layer 4 between the metal layer 1 and the heat-fusible resin layer 2. It is preferable that all the adhesive layers inside the metal layer be adhesive layer A (a cured product of a polyolefin-based adhesive).

[0102] The adhesive used for forming the adhesive layer 5 is not limited, and it may be any of a chemical reaction type, a solvent volatilization type, a hot melt type, a hot press type, etc. Further, it may be a two-component curing type adhesive (two-component adhesive), a one-component curing type adhesive (one-component adhesive), or a resin without a curing reaction. Also, the adhesive layer 5 may be a single layer or a multi-layer.

[0103] Specific examples of adhesive components contained in the adhesive include polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, and copolymer polyesters; polyethers; polyurethanes; epoxy resins; phenolic resins; polyamides such as nylon 6, nylon 66, nylon 12, and copolymer polyamides; polyolefin-based resins such as polyolefins, cyclic polyolefins, acid-modified polyolefins, and acid-modified cyclic polyolefins; polyvinyl acetate; cellulose; (meth)acrylic resins; polyimides; polycarbonates; amino resins such as urea resins and melamine resins; rubbers such as chloroprene rubber, nitrile rubber, and styrene-butadiene rubber; and silicone resins. These adhesive components may be used alone or in combination of two or more. Among these adhesive components, polyolefin-based adhesives and polyurethane adhesives are preferred, with polyolefin-based adhesives being particularly preferred. Furthermore, the adhesive strength of these adhesive component resins can be increased by using an appropriate curing agent in combination. The curing agent is appropriately selected from polyisocyanates, polyfunctional epoxy resins, oxazoline group-containing polymers, polyamine resins, acid anhydrides, etc., depending on the functional groups of the adhesive component.

[0104] The adhesive component contained in the adhesive that forms the adhesive layer 5 is preferably a polyolefin-based adhesive, a polyurethane adhesive, or the like. Regarding the adhesive layer 5, from the viewpoint of further strengthening the adhesion between the resin layer 4 and the heat-fusible resin layer 2 (for example, increasing the adhesive strength in a humid and hot environment), the resin used to form the adhesive layer 5 preferably contains a polyolefin skeleton. That is, the adhesive layer 5 is preferably formed from a cured product of a polyolefin-based adhesive. Examples of adhesives that form the adhesive layer 5 include the same adhesives as those exemplified for the adhesive layer 3. It is also preferable that the adhesive layer 5 is formed from the same adhesive as the adhesive layer 3. As described above, in the present disclosure, it is preferable that all adhesive layers located inside the metal layer 1 are formed from a cured product of a polyolefin-based adhesive.

[0105] As described above, the adhesive layer 5 may be formed using a polyurethane adhesive or the like.

[0106] Examples of polyurethane adhesives include polyurethane adhesives containing a first part containing a polyol compound and a second part containing an isocyanate compound. Preferred examples include two-component curing polyurethane adhesives, with a polyol such as polyester polyol, polyether polyol, or acrylic polyol as the first part and an aromatic or aliphatic polyisocyanate as the second part. Examples of polyurethane adhesives include polyurethane adhesives containing a polyurethane compound obtained by reacting a polyol compound with an isocyanate compound in advance, and an isocyanate compound. Examples of polyurethane adhesives include polyurethane adhesives containing a polyurethane compound obtained by reacting a polyol compound with an isocyanate compound in advance, and a polyol compound. Examples of polyurethane adhesives include polyurethane adhesives obtained by reacting a polyurethane compound obtained by reacting a polyol compound with an isocyanate compound in advance with moisture, such as in the air, and curing the polyurethane compound. Polyol compounds preferably include polyester polyols having hydroxyl groups on the side chains in addition to terminal hydroxyl groups in the repeating units. Examples of the second part include aliphatic, alicyclic, aromatic, and araliphatic isocyanate compounds. Examples of isocyanate compounds include hexamethylene diisocyanate (HDI), xylylene diisocyanate (XDI), isophorone diisocyanate (IPDI), hydrogenated XDI (H6XDI), hydrogenated MDI (H12MDI), tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), and naphthalene diisocyanate (NDI). Also included are polyfunctional isocyanate-modified compounds of one or more of these diisocyanates. Furthermore, polymers (e.g., trimers) can also be used as polyisocyanate compounds. Examples of such polymers include adducts, biurets, and nurates.

[0107] When manufacturing the exterior material 10 for the partition member of the present disclosure by laminating the subsequent layer 5 with the resin layer 4, the heat-sealable resin layer 2, etc., a resin film formed in advance may be used as the adhesive layer 5. Also, the heat-sealable resin for forming the adhesive layer 5 may be formed into a film on the surface of the resin layer 4, the heat-sealable resin layer 2, etc. by extrusion molding, coating, etc., to form the adhesive layer 5 formed by the resin film.

[0108] Also, regarding the adhesive layer 5, similar to the adhesive layer 3, addition of other components is allowed as long as it does not inhibit adhesiveness, and it may contain a colorant, a thermoplastic elastomer, a tackifier, a filler, etc.

[0109] The thickness of the adhesive layer 5 is not particularly limited as long as the resin layer 4 and the heat-sealable resin layer 2 can be adhered, but for example, it is about 1 μm or more, about 2 μm or more. Also, the thickness of the adhesive layer 5 is, for example, about 10 μm or less, about 5 μm or less. Also, regarding the preferable range of the thickness of the adhesive layer 5, examples include about 1 to 10 μm, about 1 to 5 μm, about 2 to 10 μm, and about 2 to 5 μm.

[0110] [Protective layer 6] The protective layer 6 is a layer provided as needed for the purpose of protecting the outside of the exterior material 10 for the partition member on the outside (opposite side to the heat-sealable resin layer 2 side) of the metal layer 1 of the exterior material 10 for the partition member of the present disclosure.

[0111] The material for forming the protective layer 6 is not particularly limited as long as it has the function as a protective layer, that is, at least the function of protecting the outside of the exterior material 10 for the partition member. The protective layer 6 can be formed using, for example, a resin, and the resin may contain additives described later.

[0112] When the protective layer 6 is formed of a resin, the protective layer 6 can be formed of, for example, a resin film. When the protective layer 6 is formed of a resin film, a pre-formed resin film may be used as the protective layer 6 when the protective layer 6 is laminated with the metal layer 1 or the like to produce the partition member exterior material 10 of the present disclosure. Alternatively, the resin forming the protective layer 6 may be formed into a film on the surface of the metal layer 1 or the like by extrusion molding, coating, or the like, to form the protective layer 6 formed of a resin film. The resin film may be an unstretched film or a stretched film. Examples of stretched films include uniaxially stretched films and biaxially stretched films, with biaxially stretched films being preferred. Examples of stretching methods for forming biaxially stretched films include sequential biaxial stretching, inflation, and simultaneous biaxial stretching. Examples of methods for applying the resin include roll coating, gravure coating, and extrusion coating.

[0113] Examples of resins that can form the protective layer 6 include polyester, polyamide, polyolefin, epoxy resin, acrylic resin, fluororesin, polyurethane, silicone resin, and phenolic resin, as well as modified versions of these resins. The resin that forms the protective layer 6 can also be a copolymer of these resins, a modified version of the copolymer, or a mixture of these resins.

[0114] The protective layer 6 preferably contains these resins as the main components, and more preferably contains polyester or polyamide as the main components. Here, the main component means a resin component having a content of, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, still more preferably 80% by mass or more, still more preferably 90% by mass or more, still more preferably 95% by mass or more, still more preferably 98% by mass or more, and still more preferably 99% by mass or more among the resin components contained in the protective layer 6. For example, when the protective layer 6 contains polyester or polyamide as the main components, it means that the content of polyester or polyamide among the resin components contained in the protective layer 6 is, respectively, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, still more preferably 80% by mass or more, still more preferably 90% by mass or more, still more preferably 95% by mass or more, still more preferably 98% by mass or more, and still more preferably 99% by mass or more.

[0115] Among these, the resins for forming the protective layer 6 preferably include polyester and polyamide.

[0116] Examples of the polyester include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, copolyester, etc. Examples of the copolyester include copolyesters having ethylene terephthalate as the main repeating unit. Specifically, copolyester polyesters obtained by polymerizing ethylene isophthalate with ethylene terephthalate as the main repeating unit (hereinafter abbreviated following polyethylene (terephthalate / isophthalate)), polyethylene (terephthalate / adipate), polyethylene (terephthalate / sodium sulfoisophthalate), polyethylene (terephthalate / sodium isophthalate), polyethylene (terephthalate / phenyl-dicarboxylate), polyethylene (terephthalate / decanedicarboxylate), etc. are included. These polyesters may be used alone or in combination of two or more.

[0117] Examples of the polyamide include aliphatic polyamides such as nylon 6, nylon 66, nylon 610, nylon 12, nylon 46, and copolymers of nylon 6 and nylon 66; hexamethylenediamine-isophthalic acid-terephthalic acid copolyamides such as nylon 6I, nylon 6T, nylon 6IT, and nylon 6I6T (where I represents isophthalic acid and T represents terephthalic acid) containing structural units derived from terephthalic acid and / or isophthalic acid, polyamides containing aromatics such as polyamide MXD6 (polymetaxylylene adipamide); alicyclic polyamides such as polyamide PACM6 (poly-bis(4-aminocyclohexyl)methane adipamide); furthermore, polyamides copolymerized with lactam components or isocyanate components such as 4,4'-diphenylmethane-diisocyanate, polyester amide copolymers and polyether ester amide copolymers which are copolymers of copolyamides with polyesters or polyalkylene ether glycols; and polyamides such as these copolymers. These polyamides may be used alone or in combination of two or more.

[0118] The protective layer 6 preferably contains at least one of a polyester film, a polyamide film, and a polyolefin film, preferably contains at least one of a stretched polyester film, a stretched polyamide film, and a stretched polyolefin film, and more preferably contains at least one of a biaxially stretched polyethylene terephthalate film, a biaxially stretched polybutylene terephthalate film, a biaxially stretched nylon film, and a biaxially stretched polypropylene film.

[0119] The protective layer 6 may be a single layer or may be composed of two or more layers. When the protective layer 6 is composed of two or more layers, the protective layer 6 may be a laminate in which resin films are laminated with an adhesive or the like, or may be a laminate of resin films obtained by co-extruding resins into two or more layers. Further, the laminate of resin films obtained by co-extruding resins into two or more layers may be used as the protective layer 6 without stretching, or may be used as the protective layer 6 after uniaxial stretching or biaxial stretching.

[0120] In the protective layer 6, specific examples of the laminate of two or more resin films include a laminate of a polyester film and a nylon film, a laminate of two or more nylon films, a laminate of two or more polyester films, etc. Preferably, a laminate of a stretched nylon film and a stretched polyester film, a laminate of two or more stretched nylon films, and a laminate of two or more stretched polyester films are preferred. For example, when the protective layer 6 is a laminate of two resin films, a laminate of a polyester resin film and a polyester resin film, a laminate of a polyamide resin film and a polyamide resin film, or a laminate of a polyester resin film and a polyamide resin film is preferred, and a laminate of a polyethylene terephthalate film and a polyethylene terephthalate film, a laminate of a nylon film and a nylon film, or a laminate of a polyethylene terephthalate film and a nylon film is more preferred. Further, since the polyester resin is less likely to change color when, for example, an electrolytic solution adheres to the surface, when the protective layer 6 is a laminate of two or more resin films, it is preferable that the polyester resin film is located on the outermost layer of the protective layer 6. In the laminate of a polyester resin film and a polyamide resin film, the preferable range of the thickness of the polyester resin film is about 2 to 33 μm, about 2 to 28 μm, about 2 to 23 μm, about 2 to 18 μm, about 2 to 11 μm, about 2 to 8 μm, about 10 to 33 μm, about 10 to 28 μm, about 10 to 23 μm, about 10 to 18 μm, about 10 to 11 μm, about 18 to 33 μm, about 18 to 28 μm, about 18 to 23 μm, and the preferable range of the thickness of the polyamide resin film is about 2 to 33 μm, about 2 to 28 μm, about 2 to 23 μm, about 2 to 18 μm, about 2 to 11 μm, about 2 to 8 μm, about 10 to 33 μm, about 10 to 28 μm, about 10 to 23 μm, about 10 to 18 μm, about 10 to 11 μm, about 18 to 33 μm, about 18 to 28 μm, about 18 to 23 μm.

[0121] When the protective layer 6 is a laminate of two or more resin films, the two or more resin films may be laminated via an adhesive. Preferred adhesives include the same ones as those exemplified for the adhesive layer 3. Note that the method for laminating two or more resin films is not particularly limited, and known methods can be adopted. For example, dry lamination method, sandwich lamination method, extrusion lamination method, thermal lamination method, etc. can be mentioned, and preferably the dry lamination method can be mentioned. When laminating by the dry lamination method, it is preferable to use a polyurethane adhesive as the adhesive. At this time, the thickness of the adhesive is, for example, about 2 to 5 μm. Also, an anchor coat layer may be formed on and laminated to the resin film. The anchor coat layer includes the same ones as those exemplified for the adhesive of the aforementioned adhesive layer 3. At this time, the thickness of the anchor coat layer is, for example, about 0.01 to 1.0 μm.

[0122] In addition, additives such as lubricants, flame retardants, antiblocking agents, antioxidants, light stabilizers, tackifiers, antistatic agents, etc. may be present on at least one of the surface and inside of the protective layer 6. Only one type of additive may be used, or two or more types may be mixed and used.

[0123] In the present disclosure, from the viewpoint of enhancing the followability of the exterior material for the partition member, it is preferable that a lubricant is present on at least one of the surface and the interior of the protective layer 6. The lubricant is not particularly limited, but preferably an amide-based lubricant. Specific examples of the amide-based lubricant include, for example, saturated fatty acid amides, unsaturated fatty acid amides, substituted amides, methylol amides, saturated fatty acid bisamides, unsaturated fatty acid bisamides, fatty acid ester amides, aromatic bisamides, and the like. Specific examples of the saturated fatty acid amides include lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, hydroxystearic acid amide, and the like. Specific examples of the unsaturated fatty acid amides include oleic acid amide, erucic acid amide, and the like. Specific examples of the substituted amides include N-oleyl palmitic acid amide, N-stearyl stearic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucic acid amide, and the like. Specific examples of the methylol amides include methylol stearic acid amide, and the like. Specific examples of the saturated fatty acid bisamides include methylene bisstearic acid amide, ethylene biscapric acid amide, ethylene bislauric acid amide, ethylene bisstearic acid amide, ethylene bishydroxystearic acid amide, ethylene bisbehenic acid amide, hexamethylene bisstearic acid amide, hexamethylene bisbehenic acid amide, hexamethylene hydroxystearic acid amide, N,N'-distearyl adipic acid amide, N,N'-distearyl sebacic acid amide, and the like. Specific examples of the unsaturated fatty acid bisamides include ethylene bisoleic acid amide, ethylene biserucic acid amide, hexamethylene bisoleic acid amide, N,N'-dioleyl adipic acid amide, N,N'-dioleyl sebacic acid amide, and the like. Specific examples of the fatty acid ester amides include stearamide ethyl stearate, and the like. Specific examples of the aromatic bisamides include m-xylylene bisstearic acid amide, m-xylylene bishydroxystearic acid amide, N,N'-distearyl isophthalic acid amide, and the like.The lubricant may be used alone or in combination of two or more kinds, and it is preferable to use two or more kinds in combination.

[0124] When the lubricant is present on the surface of the protective layer 6, its amount of presence is not particularly limited. For example, it is about 3 mg / m 2 or more, preferably about 4 mg / m 2 or more, about 5 mg / m 2 or more. Also, as the amount of the lubricant present on the surface of the protective layer 6, for example, it is about 15 mg / m 2 or less, preferably about 14 mg / m 2 or less, about 10 mg / m 2 or less. Also, the preferable range of the amount of the lubricant present on the surface of the protective layer 6 is about 3 to 15 mg / m 2 level, about 3 to 14 mg / m 2 level, about 3 to 10 mg / m 2 level, about 4 to 15 mg / m 2 level, about 4 to 14 mg / m 2 level, about 4 to 10 mg / m 2 level, about 5 to 15 mg / m 2 level, about 5 to 14 mg / m 2 level, about 5 to 10 mg / m 2 level and the like can be mentioned.

[0125] The lubricant present on the surface of the protective layer 6 may be one obtained by exuding the lubricant contained in the resin constituting the protective layer 6, or may be one obtained by applying the lubricant to the surface of the protective layer 6.

[0126] The thickness of the protective layer 6 is not particularly limited as long as it exhibits the function as a protective layer. For example, it is about 3 μm or more, preferably about 10 μm or more. Also, examples of the thickness of the protective layer 6 include about 50 μm or less, preferably about 35 μm or less, about 25 μm or less, and about 20 μm or less. Further, preferred ranges of the thickness of the protective layer 6 include about 3 to 50 μm, about 3 to 35 μm, about 3 to 25 μm, about 3 to 20 μm, about 10 to 50 μm, about 10 to 35 μm, about 10 to 25 μm, and about 10 to 20 μm. Particularly when making the partition member lightweight and thin, about 3 to 35 μm, about 3 to 25 μm, and about 3 to 20 μm are preferred. When the protective layer 6 is a laminate of two or more resin films, the thickness of the resin film constituting each layer is not particularly limited. For example, each is about 2 μm or more, preferably about 10 μm or more, and about 12 μm or more. Also, examples of the thickness of the resin film constituting each layer include about 33 μm or less, preferably about 28 μm or less, about 23 μm or less, about 18 μm or less, about 11 μm or less, and about 8 μm or less. Further, preferred ranges of the thickness of the resin film constituting each layer include about 2 to 33 μm, about 2 to 28 μm, about 2 to 23 μm, about 2 to 18 μm, about 2 to 11 μm, about 2 to 8 μm, about 10 to 33 μm, about 10 to 28 μm, about 10 to 23 μm, about 10 to 18 μm, about 10 to 11 μm, about 12 to 33 μm, about 12 to 28 μm, about 12 to 23 μm, and about 12 to 18 μm.

[0127] [Adhesive layer 7] The adhesive layer 7 is a layer provided as necessary to bond the protective layer 6 and the metal layer 1 when the exterior material 10 for the partition member of the present disclosure includes the protective layer 6 outside the metal layer 1.

[0128] The adhesive layer 7 is formed of an adhesive capable of bonding the protective layer 6 and the metal layer 1. The adhesive used for forming the adhesive layer 7 is not limited, and the same adhesives as those exemplified for the adhesive layer 3 are exemplified.

[0129] As the adhesive component contained in the adhesive for forming the adhesive layer 7, similar to the adhesive layer 5, preferably, a polyolefin-based adhesive, a polyurethane adhesive, etc. may be mentioned. Also for the adhesive layer 7, from the viewpoint of more firmly adhering the protective layer 6 and the metal layer 1 (for example, enhancing the adhesive strength in a wet and hot environment), it is preferable that the resin used for forming the adhesive layer 7 contains a polyolefin skeleton. It is also preferable that the adhesive layer 7 is formed of the same adhesive as the adhesive layer 3.

[0130] Also, for the adhesive layer 7, similar to the adhesive layers 3 and 5, the addition of other components is allowed as long as the adhesiveness is not inhibited, and it may contain a colorant, a thermoplastic elastomer, a tackifier, a filler, etc. By the adhesive layer 7 containing a colorant, the outside of the exterior material for the partition member can be colored. As the colorant, known ones such as pigments and dyes can be used. Also, only one type of colorant may be used, or two or more types may be mixed and used.

[0131] The type of the pigment is not particularly limited as long as it does not impair the adhesiveness of the adhesive layer 7. Examples of organic pigments include pigments such as azo-based, phthalocyanine-based, quinacridone-based, anthraquinone-based, dioxazine-based, indigothioindigo-based, perinone-perylene-based, isoindolenine-based, benzimidazolone-based, etc. Examples of inorganic pigments include pigments such as carbon black-based, titanium oxide-based, cadmium-based, lead-based, chromium oxide-based, iron-based, etc. In addition, fine powders of mica, fish scale foil, etc. may be mentioned.

[0132] Among the colorants, for example, in order to make the appearance of the exterior material for the partition member black, carbon black is preferable.

[0133] The average particle diameter of the pigment is not particularly limited, and for example, it is about 0.05 to 5 μm, preferably about 0.08 to 2 μm. Note that the average particle diameter of the pigment is the median diameter measured by a laser diffraction / scattering type particle size distribution measuring device.

[0134] The content of the pigment in the adhesive layer 7 is not particularly limited as long as the exterior material for the partition member is colored. For example, it can be about 5 to 60% by mass, preferably about 10 to 40% by mass.

[0135] The thickness of the adhesive layer 7 is not particularly limited as long as the protective layer 6 and the metal layer 1 can be adhered. For example, it is about 1 μm or more, about 2 μm or more. Also, the thickness of the adhesive layer 7 is, for example, about 10 μm or less, about 5 μm or less. Also, the preferable range of the thickness of the adhesive layer 7 includes about 1 to 10 μm, about 1 to 5 μm, about 2 to 10 μm, and about 2 to 5 μm.

[0136] [Coloring layer] The coloring layer is a layer provided between the protective layer 6 and the metal layer 1 as needed (illustration is omitted). When having the adhesive layer 7, a coloring layer may be provided between the protective layer 6 and the adhesive layer 7, and between the adhesive layer 7 and the metal layer 1. Also, a coloring layer may be provided outside the protective layer 6. By providing the coloring layer, the exterior material for the partition member can be colored.

[0137] The coloring layer can be formed, for example, by applying ink containing a colorant to the surface of the protective layer 6 or the surface of the metal layer 1. As the colorant, known ones such as pigments and dyes can be used. Also, only one type of colorant may be used, or two or more types may be mixed and used.

[0138] Specific examples of the colorant contained in the coloring layer are the same as those exemplified in the column of [adhesive layer 7].

[0139] The exterior material for the partition member in the present disclosure can be used for a partition member disposed between a plurality of heating elements. In the partition member, the exterior material for the partition member can be arranged and used so that the heat-fusible resin layer faces the content (for example, a coolant) side and faces each other through the content.

[0140] 3. Manufacturing method of exterior material for partition member The manufacturing method of the exterior material for the partition member is not particularly limited as long as a laminate in which each layer included in the exterior material for the partition member of the present disclosure is laminated, and examples thereof include a method including at least a step of laminating a metal layer 1, an adhesive layer 3, and a heat-fusible resin layer 2. As described above, in the exterior material 10 for the partition member of the present disclosure, layers such as a protective layer 6, an adhesive layer 7, a resin layer 4, and an adhesive layer 5 can be further laminated as necessary.

[0141] As an example of the manufacturing method of the exterior material for the partition member of the present disclosure, it is as follows. First, a laminate (hereinafter, may also be referred to as "laminate A") in which a protective layer 6, an adhesive layer 7, and a metal layer 1 are laminated in this order is formed. Specifically, the formation of laminate A is carried out by applying an adhesive used for forming the adhesive layer 7 onto the protective layer 6 or the metal layer 1 whose surface is chemical conversion-treated as necessary by a coating method such as a gravure coating method or a roll coating method, drying, and then laminating the metal layer 1 or the protective layer 6 and curing the adhesive layer 7 by a dry lamination method.

[0142] Next, a heat-sealable resin layer 2 is laminated on the metal layer 1 of the laminate A. When the heat-sealable resin layer 2 is directly laminated on the metal layer 1, it may be laminated on the metal layer 1 of the laminate A by a method such as a thermal lamination method or an extrusion lamination method. When an adhesive layer 3 is provided between the metal layer 1 and the heat-sealable resin layer 2, the adhesive layer 3 and the heat-sealable resin layer 2 can be laminated, for example, by (1) an extrusion lamination method, (2) a thermal lamination method, (3) a sandwich lamination method, (4) a dry lamination method, etc. As (1) the extrusion lamination method, for example, there are methods such as laminating by extruding the adhesive layer 3 and the heat-sealable resin layer 2 on the metal layer 1 of the laminate A (co-extrusion lamination method, tandem lamination method). As (2) the thermal lamination method, for example, there are methods such as forming a laminate in which the adhesive layer 3 and the heat-sealable resin layer 2 are laminated separately and laminating this on the metal layer 1 of the laminate A, or forming a laminate in which the adhesive layer 3 is laminated on the metal layer 1 of the laminate A and laminating this with the heat-sealable resin layer 2. As (3) the sandwich lamination method, for example, there is a method of pouring the molten adhesive layer 3 between the metal layer 1 of the laminate A and the heat-sealable resin layer 2 previously formed into a sheet shape, and bonding the laminate A and the heat-sealable resin layer 2 through the adhesive layer 3 while pouring. As (4) the dry lamination method, for example, there are methods such as solution coating and drying an adhesive for forming the adhesive layer 3 on the metal layer 1 of the laminate A, and further baking, and laminating the heat-sealable resin layer 2 previously formed into a sheet shape on this adhesive layer 3.

[0143] Even when there is a resin layer 4 between the metal layer 1 and the heat-sealable resin layer 2, for example, an adhesive layer 5 is further provided, and the metal layer 1, the adhesive layer 3, the resin layer 4, the adhesive layer 5, and the heat-sealable resin layer 2 can be laminated in this order by (1) an extrusion lamination method, (2) a thermal lamination method, (3) a sandwich lamination method, (4) a dry lamination method, etc.

[0144] As described above, a laminate is formed which includes, in this order, optional protective layer 6, optional adhesive layer 7, metal layer 1, adhesive layer 3, optional resin layer 4, optional adhesive layer 5, and heat-sealable resin layer 2. To strengthen the adhesiveness of the optional adhesive layers 3, 5, and 7, the laminate may be further subjected to a heat treatment.

[0145] In the exterior packaging material for partition members, each layer constituting the laminate may be subjected to a surface activation treatment such as corona treatment, blast treatment, oxidation treatment, ozone treatment, etc., as needed to improve processability. For example, by subjecting the surface of protective layer 6 opposite to metal layer 1 to corona treatment, the printability of ink on the surface of protective layer 6 can be improved.

[0146] 4. Partition member The partition member of the present disclosure is a partition member disposed between a plurality of heat generating elements, and includes a content (such as a cooling material) and an exterior packaging material for packaging the content. The exterior packaging material is the above-described exterior packaging material for a partition member of the present disclosure.

[0147] Fig. 5 is a schematic cross-sectional view showing an example of a partition member according to the present disclosure. As shown in Fig. 5, partition member 20 has coolant 21 and an exterior packaging material 10 that encloses coolant 21, and exterior packaging material 10 is, for example, an exterior packaging material for a partition member such as those shown in Figs. 1 to 4. Partition member 20 is a bag body formed by two sheets of exterior packaging materials 10 facing each other with their heat-sealable resin layers facing each other and joining end portions 22 by heat fusion, and coolant 21 is enclosed in the bag body.

[0148] In the present disclosure, the exterior material is the above-described exterior material for a partition member of the present disclosure, thereby providing a partition member whose expansion is suppressed.

[0149] In the partition member 20, the exterior packaging material 10 is a member that encloses the contents of the partition member 20, such as the coolant 21. As described above, the exterior packaging material of the partition member 20 is the exterior packaging material 10 for a partition member of the present disclosure.

[0150] The content of the partition member 20 is a member to be enclosed by the exterior material. Note that being enclosed means being sealed inside a bag formed using the exterior material. Since the partition member of the present disclosure is disposed between a plurality of heating elements, the content of the partition member is typically the coolant 21.

[0151] The coolant preferably contains at least one liquid selected from the group consisting of, for example, water, alcohols, esters, ethers, ketones, hydrocarbons, fluorine-based compounds, and silicone oils. These liquids may be used alone or as a mixture of two or more.

[0152] Examples of alcohols include alcohols containing 3 to 8 carbon atoms such as propanol, isopropanol, butanol, benzyl alcohol, and phenylethyl alcohol; and dihydric or higher alcohols such as alkylene glycols such as ethylene glycol and propylene glycol. These may be used alone or as a mixture of two or more.

[0153] Examples of esters include alkyl aliphatic carboxylic acid esters, alkyl carbonic acid diesters, alkyl oxalic acid diesters, fatty acid esters of ethylene glycol, and the like. These may be used alone or as a mixture of two or more.

[0154] Examples of ethers include n-butyl ether, n-propyl ether, isoamyl ether, and the like. These may be used alone or as a mixture of two or more.

[0155] Examples of ketones include ethyl methyl ketone, diethyl ketone, and the like. These may be used alone or as a mixture of two or more.

[0156] Examples of hydrocarbons include heptane, octane, nonane, decane, toluene, xylene, etc. These may be used alone or as a mixture of two or more.

[0157] Examples of fluorine-based compounds include refrigerants such as 1,1,2,2,3,3,4-heptafluorocyclopentane (HFC-c447ef) and 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorooctane (HFC-76-13sf), which may be used alone or in combination of two or more.

[0158] Examples of silicone oils include modified silicone oils such as methylpolysiloxane, methylphenylpolysiloxane, cyclic methylsiloxane, silicone polyether copolymer, etc. These may be used alone or as a mixture of two or more.

[0159] In particular, it is preferable that the coolant contains water. Since water has a large heat of vaporization, when the coolant contains water, the heat generating element can be cooled efficiently. In addition, water is chemically stable.

[0160] The coolant may be neutral, alkaline, or acidic. When the coolant is alkaline or acidic, the reaction between the coolant and the metal layer is likely to proceed, and the effects of the present disclosure are therefore more pronounced.

[0161] The coolant may further contain a thickener. The thickener increases the viscosity of the coolant, so that when the heat-generating element generates abnormal heat and the sealing portion of the exterior material peels off, releasing the coolant from the partition member, the coolant can be kept in contact with the heat-generating element for a longer period of time. This allows the heat-generating element to be cooled efficiently. Examples of thickeners include gelatin, xanthan gum, alginic acid, and carboxymethyl cellulose.

[0162] The coolant may also contain, for example, an antifreeze, a preservative, and a pH adjuster.

[0163] The partition member of the present disclosure may contain a core material as its contents. The core material is preferably capable of holding the coolant 21.

[0164] Examples of the core material include porous materials. The porous material preferably contains at least one of fibers and particles. Examples of porous materials containing fibers include paper, cotton sheets, polyimide fibers, aramid fibers, polytetrafluoroethylene (PTFE) fibers, glass wool, rock wool, ceramic fibers, and biosoluble inorganic fibers. Examples of porous materials containing particles include silica particles, alumina particles, calcium silicate, clay minerals, vermiculite, mica, cement, perlite, fumed silica, and aerogel. Examples of calcium silicate include xonotlite, tobermorite, wollastonite, and gyrolite. Examples of clay minerals include magnesium silicate, montmorillonite, and kaolinite. These materials may be used alone or in combination.

[0165] The partition member of the present disclosure can be manufactured by a general method. For example, two of the above-described partition member exterior materials are prepared, and the heat-sealable resin layers of each partition member exterior material are stacked facing each other, and the outer edges of the three sides are heat-sealed to obtain a bag with an opening on one side. Contents (e.g., a cooling material, a core material, etc.) are placed in the bag through the opening, and the opening is then sealed to obtain the partition member.

[0166] That is, when the coolant is accommodated in the package formed by the exterior material for the partition member of the present disclosure, the package is formed such that the heat-sealable resin portion of the exterior material for the partition member of the present disclosure is on the inner side (the surface in contact with the coolant). The heat-sealable resins of the two exterior materials for the partition member may be opposed and overlapped, and the peripheral portions of the overlapped exterior materials for the partition member may be heat-sealed to form the package. Also, as in the example shown in FIG. 7, one exterior material for the partition member may be folded back and overlapped, and the peripheral portion may be heat-sealed to form the package. When folding back and overlapping, as in the example shown in FIG. 7, the sides other than the folded side may be heat-sealed to form the package by a three-sided seal, or it may be folded back to form a flange portion (the region where the heat-sealable resin layers come into contact) and four-sided sealed. If the coolant can be held by impregnating a porous material, etc., it may be wound around the coolant, and the heat-sealable resin layers may be sealed to form a heat-sealed portion, and the openings at both ends may be heat-sealed and sealed so as to be closed respectively. Further, a recess for accommodating the coolant may be formed in the exterior material for the partition member by deep drawing molding or protrusion molding. As in the example shown in FIG. 7, a recess may be provided in one exterior material for the partition member and not in the other exterior material for the partition member, or a recess may also be provided in the other exterior material for the partition member.

[0167] The partition member in the present disclosure can be disposed and used between a plurality of heating elements.

[0168] 5. Structure The structure in the present disclosure is a structure having a plurality of heating elements and a partition member disposed between the plurality of heating elements, and the partition member is the partition member of the present disclosure described above.

[0169] Fig. 6 is a schematic cross-sectional view showing an example of a structure according to the present disclosure. As shown in Fig. 6, structure 30 has a plurality of heating elements 31 and partition members 20 arranged between the plurality of heating elements 31, and partition members 20 are, for example, partition members such as those shown in Fig. 5. Structure 30 may also have a housing 32 that houses the plurality of heating elements 31 and partition members 20. In structure 30, partition members 20 may also be arranged between the bottom surface of housing 32 and each heating element 31.

[0170] In the structure 30 of the present disclosure, the partition member is the partition member 20 of the present disclosure, and therefore the expansion of the partition member is suppressed. Therefore, the effect of the expansion of the partition member on the heat generating element can be reduced.

[0171] In the structure 30 of the present disclosure, examples of the heat-generating body 31 include a battery (e.g., a single cell), an integrated circuit, a control panel, a motor, an engine, etc. For example, in the case of a battery, the battery becomes a heat-generating body when it generates heat (e.g., abnormal heat generation).

[0172] Examples of the battery include secondary batteries such as lithium ion secondary batteries, all-solid-state lithium ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, and lead-acid batteries.

[0173] The uses of the structure 30 of the present disclosure vary depending on the type of heating element 31.

[0174] For example, when the heating element is a secondary battery, the structure is a battery pack, which can be used as a power source for portable electronic devices, mobile communication devices, vehicles, etc.

[0175] Furthermore, for example, if the heating element is an integrated circuit, the structure would be a computer, etc. Furthermore, for example, if the heating element is a control panel, the structure would be various devices such as manufacturing equipment, etc. Furthermore, for example, if the heating element is a motor or engine, the structure would be a moving object such as a vehicle, etc. [Example]

[0176] The present disclosure will be described in detail below with reference to examples, but the present disclosure is not limited to these examples.

[0177] [Example 1] A polyethylene terephthalate film (12 μm thick) was prepared as the protective layer. An aluminum alloy foil (JIS A8079 material, 12 μm thick) was prepared as the metal layer. Next, a two-component curing urethane adhesive (polyester polyol and alicyclic isocyanate compound, thickness after curing: 1.5 μm) was used to adhere the polyethylene terephthalate film side of the protective layer to the metal layer by dry lamination, producing a laminate in which the protective layer / adhesive layer / metal layer were laminated in this order.

[0178] Both sides of the aluminum alloy foil were subjected to chemical conversion treatment to form a corrosion-resistant film. The chemical conversion treatment of the aluminum alloy foil was performed by applying the treatment solution A described below to both sides of the aluminum foil by roll coating and baking. The thickness of the corrosion-resistant film A was 26 nm.

[0179] Next, an unstretched polypropylene film (CPP, thickness 50 μm) was prepared as a heat-sealable resin layer. Next, using adhesive A described later, the metal layer side of the obtained laminate and the heat-sealable resin layer were adhered by a dry lamination method, and adhesive layer A (thickness after curing: 1.5 μm) / heat-sealable resin layer was laminated on the metal layer. Next, the obtained laminate was aged and heated to obtain an exterior material for partition members consisting of a laminate in which protective layer / adhesive layer / metal layer / adhesive layer A / heat-sealable resin layer were laminated in this order.

[0180] [Example 2] A laminate having a protective layer, an adhesive layer, and a metal layer laminated in this order was produced in the same manner as in Example 1. As in Example 1, both surfaces of the aluminum alloy foil were subjected to a chemical conversion treatment using treatment solution A described below to form a corrosion-resistant coating A. The thickness of the corrosion-resistant coating A was 26 nm.

[0181] Next, as the heat-sealable resin layer, an unstretched polypropylene film (CPP thickness: 50 μm) was prepared. Also, as the resin layer disposed between the metal layer and the heat-sealable resin layer, a biaxially stretched nylon film (thickness: 15 μm) was prepared. Using the adhesive A described later, the metal layer side of the obtained laminate and the resin layer were adhered by the dry lamination method, and an adhesive layer A (thickness after curing: 1.5 μm) / resin layer was laminated on the metal layer. Further, using the adhesive A described later, the resin layer side of the obtained laminate and the heat-sealable resin layer were adhered by the dry lamination method, and an adhesive layer A (thickness after curing: 1.5 μm) / heat-sealable resin layer was laminated on the resin layer. Next, the obtained laminate was aged and heated to obtain an exterior material for a partition member composed of a laminate in which a protective layer / adhesive layer / metal layer / adhesive layer A / resin layer / adhesive layer A / heat-sealable resin layer were laminated in this order.

[0182] [Example 3] An exterior material for a partition member composed of a laminate in which a protective layer / adhesive layer / metal layer / adhesive layer A / heat-sealable resin layer were laminated in this order was obtained in the same manner as in Example 1, except that chemical conversion treatment was performed on both sides of the aluminum alloy foil using the treatment liquid B described later instead of the treatment liquid A to form a corrosion-resistant film B. The thickness of the corrosion-resistant film B was 23 nm.

[0183] [Example 4] An exterior material for a partition member composed of a laminate in which a protective layer / adhesive layer / metal layer / adhesive layer A / heat-sealable resin layer were laminated in this order was obtained in the same manner as in Example 1, except that chemical conversion treatment was performed on both sides of the aluminum alloy foil using the treatment liquid C described later instead of the treatment liquid A to form a corrosion-resistant film C. The thickness of the corrosion-resistant film C was 15 nm.

[0184] [Example 5] An exterior material for a partition member composed of a laminate in which a protective layer / adhesive layer / metal layer / adhesive layer A / heat-sealable resin layer were laminated in this order was obtained in the same manner as in Example 1, except that chemical conversion treatment was performed on both sides of the aluminum alloy foil using the treatment liquid D described later instead of the treatment liquid A to form a corrosion-resistant film D. The thickness of the corrosion-resistant film D was 17 nm.

[0185] [Example 6] An exterior packaging material for partition members was obtained in the same manner as in Example 1, except that a chemical conversion treatment was performed on both sides of an aluminum alloy foil using treatment solution E described below instead of treatment solution A to form a corrosion-resistant coating E. The thickness of the corrosion-resistant coating E was 29 nm.

[0186] [Example 7] Except for not performing chemical conversion treatment on the aluminum alloy foil, an exterior material for partition members was obtained in the same manner as in Example 1, consisting of a laminate in which a protective layer / adhesive layer / metal layer / adhesive layer A / thermally adhesive resin layer were laminated in this order.

[0187] [Example 8] A polyethylene terephthalate film (thickness: 12 μm) was prepared as the protective layer. An aluminum alloy foil (JIS A8079 material, thickness: 12 μm) was prepared as the metal layer. Next, the polyethylene terephthalate film side of the protective layer and the metal layer were adhered to each other by a dry lamination method using adhesive A described below, to produce a laminate in which the protective layer / adhesive layer A / metal layer were laminated in this order.

[0188] Both sides of the aluminum alloy foil were subjected to chemical conversion treatment to form a corrosion-resistant film. The chemical conversion treatment of the aluminum alloy foil was performed by applying the treatment solution A described below to both sides of the aluminum foil by roll coating and baking. The thickness of the corrosion-resistant film A was 26 nm.

[0189] Next, an unstretched polypropylene film (CPP, thickness 50 μm) was prepared as a heat-sealable resin layer. Next, using adhesive A described later, the metal layer side of the obtained laminate and the heat-sealable resin layer were adhered by a dry lamination method, and adhesive layer A (thickness after curing: 1.5 μm) / heat-sealable resin layer was laminated on the metal layer. Next, the obtained laminate was aged and heated to obtain an exterior material for partition members consisting of a laminate in which protective layer / adhesive layer A / metal layer / adhesive layer A / heat-sealable resin layer were laminated in this order.

[0190] [Example 9] As the protective layer, a polyethylene terephthalate film (thickness 12 μm) was prepared. As the metal layer, an aluminum alloy foil (JIS A8079 material, thickness 12 μm) was prepared. Next, a two-component curable urethane adhesive (a polyester polyol and an alicyclic isocyanate compound, thickness after curing 1.5 μm) was used, and by the dry lamination method, the polyethylene terephthalate film side of the protective layer and the metal layer were adhered to produce a laminate in which the protective layer / adhesive layer / metal layer were laminated in this order.

[0191] Chemical conversion treatment was performed on both sides of the aluminum alloy foil to form a corrosion-resistant film. The chemical conversion treatment of the aluminum alloy foil was carried out by applying the treatment liquid A described later to both sides of the aluminum foil by the roll coating method and baking it. The thickness of the corrosion-resistant film A was 26 nm.

[0192] Next, as the heat-sealable resin layer, an unstretched polypropylene film (CPP thickness 50 μm) was prepared. Also, as the resin layer disposed between the metal layer and the heat-sealable resin layer, a biaxially stretched nylon film (thickness 15 μm) was prepared. Using the adhesive A described later, by the dry lamination method, the metal layer side of the obtained laminate and the resin layer were adhered, and an adhesive layer A (thickness after curing 1.5 μm) / resin layer was laminated on the metal layer. Further, using the adhesive A described later, by the dry lamination method, the resin layer side of the obtained laminate and the heat-sealable resin layer were adhered, and an adhesive layer A (thickness after curing 1.5 μm) / heat-sealable resin layer was laminated on the resin layer. Next, the obtained laminate was aged and heated to obtain an exterior material for a partition member composed of a laminate in which the protective layer / adhesive layer A / metal layer / adhesive layer A / resin layer / adhesive layer A / heat-sealable resin layer were laminated in this order.

[0193] [Example 10] An exterior material for a partition member composed of a laminate in which the protective layer / adhesive layer A / metal layer / adhesive layer A / resin layer / adhesive layer A / heat-sealable resin layer were laminated in this order was obtained in the same manner as in Example 9 except that the chemical conversion treatment of the aluminum alloy foil was not performed.

[0194] [Comparative Example 1] An exterior material for partition members was obtained in the same manner as in Example 1, except that the metal layer side of the laminate in which the protective layer / adhesive layer / metal layer were laminated in that order and the heat-sealable resin layer were bonded together, and adhesive B described below was used instead of adhesive A.

[0195] Comparative Example 2 An exterior material for partition members was obtained in the same manner as in Example 1, except that the metal layer side of the laminate in which the protective layer / adhesive layer / metal layer were laminated in that order and the heat-sealable resin layer were bonded together, and adhesive C described below was used instead of adhesive A.

[0196] Comparative Example 3 Except for not performing chemical conversion treatment on the aluminum alloy foil, an exterior material for partition members was obtained in the same manner as in Comparative Example 1, consisting of a laminate in which a protective layer / adhesive layer / metal layer / adhesive layer B / thermally adhesive resin layer were laminated in this order.

[0197] [glue] Adhesive A: Polyolefin adhesive (composition: base agent containing modified polyolefin and curing agent containing epoxy) Adhesive B: Urethane adhesive (composition: base agent containing polyether polyol and curing agent containing aromatic isocyanate compound) Adhesive C: Urethane adhesive (composition: base agent containing polyester polyol and curing agent containing aliphatic isocyanate and aromatic isocyanate)

[0198] [Processing liquid] Treatment solution A: Chemical conversion treatment solution containing chromium phosphate and acrylic resin Treatment solution B: Chemical conversion treatment solution containing zirconium phosphate Treatment solution C: Chemical conversion treatment solution containing zirconium phosphate and organic resin (rich in inorganic components) Treatment solution D: Chemical conversion treatment solution containing zirconium phosphate and organic resin (rich in organic components) · Treatment liquid E: A chemical conversion treatment liquid containing chromium phosphate and an organic resin

[0199] [XPS Analysis of the Corrosion-Resistant Coating] Under the following measurement conditions, X-ray photoelectron analysis (XPS analysis) was performed on the surfaces of the corrosion-resistant coatings A - E of each aluminum alloy foil used in the examples and the surface of the aluminum alloy foil on which the corrosion-resistant coating was not formed in the comparative example (Ref: untreated ALM), and the atomic composition ratio (at%) of each element was measured. This measurement was carried out by peeling each laminate to expose the surface of the aluminum alloy foil, wiping the surface with an organic solvent and drying it before measurement. The results are shown in Table 1. [Evaluation of Adhesion of Exterior Materials] · Equipment used: "PHI5000VersaProbeIII" (a scanning X-ray photoelectron spectrometer manufactured by PHI) · Spectrum acquisition conditions Incident X-ray: AlKα (monochromatic X-ray, hν = 1486.6 eV) X-ray output: 50 W (15 kV·3.3 mA) X-ray beam diameter: 200 μmφ X-ray scanning: 700 μm×200 μm (surface XPS analysis) Photoelectron capture angle: 45 degrees Charge neutralization: Electron neutralization gun, low-acceleration ion irradiation · Low-speed electron irradiation conditions... Emission 10 μA, bias potential 1.0 V · Low-acceleration ion irradiation conditions... Ion species Ar+, acceleration voltage 0.11 kV, emission 7 mA

[0200]

Table 1

[0201] [Evaluation of Adhesion of Exterior Materials] The exterior materials for each partition member obtained in the examples and comparative examples were sized TD100 mm × MD150 mm. Using a PCT apparatus (HAST tester PC-R8 manufactured by Hirayama Seisakusho), the exterior materials were stored in a humid heat environment (temperature 120°C, relative humidity 100%, pressure 0.199 MPa) for 16 days. The adhesion strength of the exterior materials before and after storage was measured. The measurement location of the adhesion strength was the interface portion between the metal layer of the exterior material and the layer on the side of the heat-fusible resin layer (the portion where the adhesive layer adhered to the metal layer is located). The specific method for measuring the adhesion strength is as follows. Each exterior material for the partition member was further cut into a rectangle of TD15 mm × MD100 mm to obtain a measurement sample. Next, after partially peeling between the metal layer (aluminum alloy foil) of the measurement sample and the layer adhered to the metal layer via an adhesive layer (the heat-fusible resin layer in Examples 1, 3 to 8 and Comparative Examples 1 and 2, and the resin layer in Example 2), the aluminum alloy foil side and the heat-fusible resin layer side were respectively fixed to the gripping tools of a tensile testing machine so that the MD direction became the tensile direction, and measurement was performed at a chuck distance of 50 mm and a tensile speed of 100 mm / min to obtain the adhesion strength. The results are shown in Table 2.

[0202] [Expansion Evaluation of Partition Member] The exterior materials for each partition member obtained in the examples and comparative examples were sized TD100 mm × MD150 mm, and two pieces of each were prepared. Next, they were overlapped so that the heat-fusible resin layers of the exterior materials faced each other, and the outer edges of three sides were heat-welded to obtain a bag body with one side of 150 mm open. Next, glass wool with a size of 70 mm × 100 mm was stored in the bag body, and further 10 g of water was injected. Then, the inside of the bag body was depressurized to about 100 Pa, and the opening of the bag body was heat-welded and sealed. Thereby, a partition member as a test sample was obtained. An accelerated test was conducted in which the obtained partition member was stored in a constant temperature bath in an environment of relative humidity 10% or less and temperature 90°C for 30 days. The presence or absence of expansion of the partition member after the accelerated test was confirmed by visual inspection and palpation. The results are shown in Table 2.

[0203]

Table 2

[0204] As described above, the present disclosure provides the following aspects of the invention. Item 1. An outer packaging material for a partition member used for a partition member arranged between multiple heat generating elements, The partition member exterior material is composed of a laminate including at least a metal layer, an adhesive layer, and a heat-sealable resin layer in this order, The adhesive layer is formed from a cured product of a polyolefin-based adhesive, and is an exterior material for a partition member. Item 2. The exterior packaging material for a partition member according to Item 1, wherein the metal layer has a corrosion-resistant coating on the surface facing the heat-sealable resin layer. Item 3. The exterior material for partition members according to Item 2, wherein the corrosion-resistant coating has an atomic composition ratio of Cr or Zr of 0.1 at% or more as detected by X-ray photoelectron analysis. Item 4. The exterior material for partition members according to Item 2 or 3, wherein the corrosion-resistant coating has a thickness of 1 nm or more. Item 5. The packaging material for a partition member according to any one of Items 1 to 4, further comprising a resin layer between the adhesive layer and the heat-sealable resin layer. Item 6. The packaging material for a partition member according to any one of Items 1 to 5, further comprising a protective layer on the side of the metal layer opposite to the heat-sealable resin layer side. Item 7. The exterior packaging material for a partition member according to any one of Items 1 to 6, wherein the metal layer contains aluminum. Item 8. The exterior packaging material for a partition member according to any one of Items 1 to 7, wherein the heat-sealable resin layer contains polypropylene. Item 9. The outer packaging material for a partition member according to any one of Items 1 to 8, wherein the heat generating element is a battery. Item 10. A partition member disposed between a plurality of heating elements, the partition member has a coolant and an exterior material that packages the coolant, The packaging material is a packaging material for a partition member according to any one of items 1 to 9. Item 11. The partition member according to Item 10, wherein the coolant includes water. Item 12. The partition member according to Item 10 or 11, wherein the heating element is a battery. Item 13. A structure having a plurality of heating elements and a partition member disposed between the plurality of heating elements, wherein the partition member is the partition member according to any one of Items 10 to 12. Item 14. The structure according to Item 13, wherein the heating element is a battery. Item 15. A method for manufacturing an exterior material for a partition member used for a partition member disposed between a plurality of heating elements, comprising at least a step of obtaining a laminate including a metal layer, an adhesive layer, and a heat-fusible resin layer in this order, wherein the adhesive layer is formed of a cured product of a polyolefin-based adhesive.

Explanation of Reference Numerals

[0205] 1 Metal layer 2 Heat-fusible resin layer 3 Adhesive layer 4 Resin layer 5 Adhesive layer 6 Protective layer 7 Adhesive layer 10 Exterior material for partition member 20 Partition member 21 Cooling material 22 End 30 Structure 31 Heating element 32 Housing

Claims

1. An exterior material for a partition member used for a partition member disposed between a plurality of heating elements, wherein the exterior material for the partition member is composed of a laminate including at least a metal layer, an adhesive layer, and a heat-sealable resin layer in this order, the metal layer is formed of an aluminum alloy foil, the heat-sealable resin layer is formed of polypropylene, the metal layer and the heat-sealable resin layer are adhered by the adhesive layer, and the adhesive layer is formed of a cured product of a polyolefin-based adhesive. An exterior material for a partition member.

2. An exterior material for a partition member used for a partition member disposed between a plurality of heating elements, wherein the exterior material for the partition member is composed of a laminate including at least a metal layer, an adhesive layer, and a heat-sealable resin layer in this order, and further has a resin layer between the adhesive layer and the heat-sealable resin layer, the metal layer is formed of an aluminum alloy foil, the resin layer is formed of a polyamide resin, the metal layer and the resin layer are adhered by the adhesive layer, and the adhesive layer is formed of a cured product of a polyolefin-based adhesive. An exterior material for a partition member.

3. The exterior material for a partition member according to claim 1 or 2, wherein the metal layer has a corrosion-resistant film on the surface on the heat-sealable resin layer side.

4. The exterior material for a partition member according to claim 3, wherein the corrosion-resistant film is detected by X-ray photoelectron analysis to have an atomic composition ratio of Cr or Zr of 0.1 at% or more.

5. The exterior material for a partition member according to claim 3 or 4, wherein the thickness of the corrosion-resistant film is 1 nm or more.

6. The exterior material for a partition member according to claim 1 or 2, further having a protective layer on the side of the metal layer opposite to the heat-sealable resin layer side.

7. The exterior material for a partition member according to claim 2, wherein the heat-sealable resin layer contains polypropylene.

8. The exterior material for a partition member according to claim 1 or 2, wherein the heating element is a battery.

9. A partition member disposed between a plurality of heating elements, wherein the partition member has a coolant and an exterior material for packaging the coolant, and the exterior material is the exterior material for a partition member according to claim 1 or 2. A partition member.

10. The partition member according to claim 9, wherein the coolant contains water.

11. The partition member according to claim 9, wherein the heating element is a battery.

12. A structure having a plurality of heating elements and a partition member disposed between the plurality of heating elements, wherein the partition member is the partition member according to Claim 9.

13. The structure according to Claim 11, wherein the heating element is a battery.

14. A method for manufacturing an exterior material for a partition member, which is used for a partition member disposed between a plurality of heating elements, comprising at least a step of obtaining a laminate including a metal layer, an adhesive layer, and a heat-fusible resin layer in this order, wherein the metal layer is formed of an aluminum alloy foil, the heat-fusible resin layer is formed of polypropylene, the metal layer and the heat-fusible resin layer are adhered by the adhesive layer, and the adhesive layer is formed of a cured product of a polyolefin-based adhesive.

15. A method for manufacturing an exterior material for a partition member, which is used for a partition member disposed between a plurality of heating elements, comprising at least a step of obtaining a laminate including a metal layer, an adhesive layer, and a heat-fusible resin layer in this order, further having a resin layer between the adhesive layer and the heat-fusible resin layer, wherein the metal layer is formed of an aluminum alloy foil, the resin layer is formed of a polyamide resin, the metal layer and the resin layer are adhered by the adhesive layer, and the adhesive layer is formed of a cured product of a polyolefin-based adhesive.

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