Outer covering material for partitioning member, manufacturing method for the same, partitioning member, and structural body

Abstract

To provide an outer covering material for partition members that suppresses expansion of the partition members, as well as partition members and structural bodies utilizing the outer covering material.SOLUTION: An outer covering material 10 for partition members is used in partition members positioned between multiple heating elements. The outer covering material 10 for partition members includes a laminate including at least a metal layer 1 and a thermally fusible resin layer 2. The metal layer 1 includes a corrosion-resistant film on the surface facing the thermally fusible resin layer 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] In a structure having multiple heat generating elements, for example, partition members for cooling the heat generating elements are arranged between the multiple heat generating elements. The partition members are composed of, for example, a cooling material and an exterior material that packages the cooling material (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 near the unit cells, the cooling unit has a sealing portion formed by sealing a sheet-like member, and a part of the sealing portion is provided with an opening portion that can be opened when the unit cells generate abnormal heat.In this battery module (structure), the cooling unit as a partition member is arranged between the unit cells as a plurality of heat-generating bodies. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2012 / 032697 [Patent Document 2] International Publication No. 2012 / 060031 [Patent Document 3] International Publication No. 2018 / 124231 Summary of the Invention [Problem to be solved by the invention]

[0005] A partition member disposed between multiple heating elements is required to have dimensional stability. However, the inventors of the present disclosure have discovered through their investigations that the partition member may generate gas inside and expand due to the influence of the contents (e.g., a coolant containing water) packaged in the exterior packaging. More specifically, the inventors of the present disclosure have discovered a new problem: when the exterior packaging of the partition member includes a metal layer, the metal layer of the exterior packaging may react with the contents to generate gas, causing the partition member to expand. When the partition member expands, the heating elements may be displaced or compressed, resulting in a deterioration in the characteristics of the heating elements.

[0006] A main object of the present disclosure is to provide an exterior material for a partition member that suppresses expansion of the partition member, and a partition member and a structure that utilizes the exterior material. [Means for solving the problem]

[0007] The inventors of the present disclosure conducted extensive research to solve the above-mentioned problems, and as a result, found that expansion of a partition member can be suppressed by configuring a partition member exterior material used for a partition member arranged between multiple heating elements from a laminate including at least a metal layer and a heat-sealable resin layer, and by providing a corrosion-resistant coating on the surface of the metal layer facing the heat-sealable resin layer.

[0008] The present disclosure has been completed based on these findings and further investigations. That is, the present disclosure provides the inventions of the following aspects. An outer covering material for a partition member used for a partition member arranged between a plurality of heat generating elements, The laminate is made up of at least a metal layer and a heat-sealable resin layer, The metal layer has a corrosion-resistant coating on the surface facing the heat-sealable resin layer. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide an exterior packaging material for a partition member that suppresses expansion of the partition member. Furthermore, according to the present disclosure, it is also possible to provide a partition member and a structure that use the exterior packaging material. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram showing an example of a cross-sectional structure of an exterior material for a partition member according to the present disclosure. [Figure 2] 1 is a schematic diagram showing an example of a cross-sectional structure of an exterior material for a partition member according to the present disclosure. [Figure 3] 1 is a schematic diagram showing an example of a cross-sectional structure of an exterior material for a partition member according to the present disclosure. [Figure 4] 1 is a schematic diagram showing an example of a cross-sectional structure of an exterior material for a partition member according to the present disclosure. [Figure 5] 1 is a schematic diagram showing an example of a cross-sectional structure of an exterior material for a partition member according to the present disclosure. [Figure 6] 1 is a schematic diagram showing an example of a cross-sectional structure of a partition member according to the present disclosure. [Figure 7] FIG. 1 is a schematic diagram showing an example of a cross-sectional structure of a structure according to the present disclosure. [Figure 8] 10A and 10B are schematic diagrams for explaining a method of storing a coolant in a package formed by the partition member of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] The partition member packaging material of the present disclosure is used for a partition member arranged between multiple heating elements, and is composed of a laminate including at least a metal layer and a heat-sealable resin layer, and the metal layer is provided with a corrosion-resistant coating on at least the surface facing the heat-sealable resin layer. By having this configuration, the partition member packaging material of the present disclosure can suppress expansion of the partition member.

[0012] The exterior material for partition members of the present disclosure will be described in detail below. In this specification, a numerical range indicated by "to" means "greater than or equal to" or "less than or equal to." For example, 2 to 15 mm means 2 mm or greater and 15 mm or less. In the numerical ranges described in stages in this disclosure, the upper or lower limit value described in a certain numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. Separately described upper and lower limits, upper and lower limits, or lower and upper limits may be combined to form a numerical range. In the numerical ranges described in this disclosure, the upper or lower limit value described in a certain numerical range may be replaced with a value shown in the examples.

[0013] In the case of an exterior material for a partition member, the MD (Machine Direction) and TD (Transverse Direction) of the metal layer 1 (described later) during the manufacturing process can usually be determined. For example, when the metal layer 1 is made of a metal foil such as an aluminum alloy foil or a stainless steel foil, linear streaks known as rolling marks are formed on the surface of the metal foil in the rolling direction (RD) of the metal foil. Because the rolling marks extend along the rolling direction, the rolling direction of the metal foil can be determined by observing the surface of the metal foil. Furthermore, during the manufacturing process of a laminate, the MD of the laminate usually coincides with the RD of the metal foil. Therefore, the MD of the laminate can be determined by observing the surface of the metal foil of the laminate and identifying the rolling direction (RD) of the metal foil. Furthermore, because the TD of the laminate is perpendicular to the MD of the laminate, the TD of the laminate can also be identified.

[0014] Furthermore, when the MD of a partition member packaging material cannot be identified due to rolling marks on a metal foil such as an aluminum alloy foil or a stainless steel foil, it can be identified by the following method. One method for confirming the MD of a partition member packaging material is to observe the cross section of the heat-sealable resin layer of the partition member packaging material using an electron microscope to confirm the sea-island structure. In this method, the direction parallel to the cross section in which the average diameter of the island shapes in the direction perpendicular to the thickness direction of the heat-sealable resin layer is largest can be determined as the MD. Specifically, the sea-island structure is confirmed by observing the longitudinal cross section of the heat-sealable resin layer and each cross section at an angle of 10 degrees from the direction parallel to the longitudinal cross section (a total of 10 cross sections) using an electron microscope. Next, the shape of each individual island is observed in each cross section. For each island shape, the straight-line distance connecting the leftmost end in the direction perpendicular to the thickness direction of the heat-sealable resin layer to the rightmost end in the perpendicular direction is defined as the diameter y. For each cross section, the average of the 20 largest diameters y of the island shapes is calculated. The direction parallel to the cross section with the largest average diameter y of the island shapes is determined as MD.

[0015] 1.Laminated structure of exterior materials for partition members As shown in Figures 1 to 5, for example, the partition member exterior packaging material 10 of the present disclosure is composed of a laminate including, from the outside, at least a metal layer 1 and a heat-sealable resin layer 2. In the partition member exterior packaging material 10, the heat-sealable resin layer 2 is the innermost layer. As shown in Figure 6, in the partition member 20 of the present disclosure, the heat-sealable resin layers 2 of the partition member exterior packaging material 10 are placed opposite each other, and the peripheral portions are heat-sealed to form a space in which the contents of the partition member 20 (e.g., a coolant 21) are contained. In the laminate constituting the partition member exterior packaging material 10 of the present disclosure, the side of the heat-sealable resin layer 2 relative to the metal layer 1 is the inner side, and the side opposite the metal layer 1 is the outer side.

[0016] The metal layer 1 is provided with a corrosion-resistant coating at least on the surface facing the heat-sealable resin layer 2. The metal layer 1 may be provided with a corrosion-resistant coating only on the surface facing the heat-sealable resin layer 2, or may be provided with a corrosion-resistant coating on both surfaces of the metal layer 1.

[0017] 2 to 5, the exterior packaging material 10 for partition members may have an adhesive layer 3 between the metal layer 1 and the heat-sealable resin layer 2 (or the resin layer 4 described below, etc.) as needed, for the purpose of enhancing the adhesion between these layers. The adhesive layer 3 is a layer that is in contact with the metal layer 1 on the inner side of the metal layer 1 and enhances the adhesive strength with layers further inside than the metal layer 1 (the heat-sealable resin layer 2, the resin layer 4, etc.).

[0018] Furthermore, 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 shown in Figures 3 to 5, for example. As described above, the metal layer 1 and the resin layer 4 may be bonded via an adhesive layer 3. Furthermore, when the exterior packaging material 10 for partition members has a resin layer 4, the resin layer 4 and the heat-sealable resin layer 2 may be bonded directly, as shown in Figure 3, or the resin layer 4 and the heat-sealable resin layer 2 may be bonded via an adhesive layer 5, as shown in Figures 4 and 5.

[0019] Furthermore, the exterior packaging material 10 for partition members may have a protective layer 6 on the outer side of the metal layer 1, as shown in Fig. 5, for example. When the protective layer 6 is provided, the protective layer 6 and the metal layer 1 may be directly bonded together (not shown), or as shown in Fig. 5, the protective layer 6 and the metal layer 1 may be bonded together via an adhesive layer 7.

[0020] The thickness of the laminate constituting the partition member exterior material 10 is not particularly limited, but from the viewpoint of cooling efficiency of the heat-generating body, cost reduction, etc., it is, for example, about 210 μm or less, preferably about 190 μm or less, about 180 μm or less, about 155 μm or less, or about 120 μm or less. Furthermore, 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, or about 60 μm or more. Furthermore, preferred ranges for the laminate constituting the exterior material 10 for partition members include, 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, and about 60 to 120 μm.

[0021] In the partition member packaging material 10, the ratio of the total thickness of the optional protective layer 6, optional adhesive layer 7, metal layer 1, optional adhesive layer 3, optional resin layer 4, optional adhesive layer 5, and heat-sealable resin layer 2 to the thickness (total thickness) of the laminate constituting the partition member packaging 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 packaging material 10 of the present disclosure includes the protective layer 6, adhesive layer 7, metal layer 1, adhesive layer 3, and heat-sealable resin layer 2, the ratio of the total thickness of these layers to the thickness (total thickness) of the laminate constituting the partition member packaging material 10 is preferably 90% or more, more preferably 95% or more, and even more preferably 98% or more. Furthermore, even when the exterior packaging material 10 for partition members of the present disclosure is a laminate including a protective layer 6, an adhesive layer 7, a metal layer 1, an adhesive layer 3, a resin layer 4, an adhesive layer 5, and a heat-sealable resin layer 2, the ratio of the total thickness of these layers to the thickness (total thickness) of the laminate constituting the exterior packaging material 10 for partition members 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 packaging material 10 for partition members of the present disclosure has an adhesion strength after storage in a humid and hot environment, as measured by the following [Evaluation of Adhesion of Exterior Material], of preferably 1.0 N / 15 mm or more, more preferably 1.5 N / 15 mm or more, and even more preferably 2.0 N / 15 mm or more. The upper limit is, for example, preferably 15.0 N / 15 mm or less, and preferred ranges include approximately 1.0 to 15.0 N / 15 mm, approximately 1.5 to 15.0 N / 15 mm, and approximately 2.0 to 15.0 N / 15 mm.

[0023] Furthermore, the adhesive strength of the exterior packaging material 10 for partition members of the present disclosure before storage in a humid and hot environment, as measured by the following [Evaluation of Adhesion of Exterior Material], is preferably 1.0 N / 15 mm or more, more preferably 1.5 N / 15 mm or more, even more preferably 2.0 N / 15 mm or more, or 6.0 N / 15 mm or more, with the upper limit being, for example, preferably 20.0 N / 15 mm or less, or 18.0 N / 15 mm or less, and 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] [Exterior material adhesion evaluation] The partition member exterior material was measured to measure 100 mm in diameter (TD) and 150 mm in width (MD). The exterior material was stored in a humid and hot environment (temperature: 120°C, relative humidity: 100%, pressure: 0.199 MPa) for 16 days using a PCT device. The adhesion strength of the exterior material was measured before and after storage. The adhesion strength was measured at the interface between the metal layer of the exterior material and the layer on the thermally adhesive resin layer side (where the adhesive layer attached to the metal layer was located). The specific method for measuring adhesion strength is as follows: Each partition member exterior material was further cut into a rectangular shape measuring 15 mm in diameter (TD) and 100 mm in width (MD) to prepare a measurement sample. Next, a partial T-shaped peel was performed in the MD between the metal layer (aluminum alloy foil) and the layer attached to the metal layer via the adhesive layer. After that, the aluminum alloy foil side and the thermally adhesive resin layer side were respectively fixed to the gripping fixtures of a tensile tester so that the MD direction was the tensile direction. Measurements were performed at a chuck distance of 50 mm and a tensile speed of 100 mm / min to obtain adhesion strength.

[0025] 2. Each layer that forms the exterior material for partition members [Metal layer 1] In the exterior packaging material for partition members, the metal layer 1 is a layer that can exhibit gas barrier properties 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 made of a metal material. Specific examples of the metal material that makes up the metal layer 1 include metals such as aluminum, nickel, stainless steel, titanium steel, iron, and steel, and alloys containing these metals.

[0027] In the metal layer 1, layers made of the aforementioned metal materials may contain recycled metal materials. Examples of recycled metal materials include recycled aluminum alloys, stainless steel, titanium steel, and steel plate. These recycled materials can be obtained by known methods. Recycled aluminum alloys can be obtained, for example, by the manufacturing method described in International Publication No. 2022 / 092231. The metal layer 1 may be made solely of recycled materials, or may be made of a mixture of recycled and virgin materials. Note that recycled metal materials refer to metal materials that have been made reusable by collecting, isolating, and refining various products used in the market or waste from manufacturing processes. Furthermore, virgin metal materials refer to new metal materials refined from natural metal resources (raw materials) and are not recycled materials.

[0028] Examples of the metal layer 1 include metal foils and metal films having barrier properties. The thickness of the metal film is not particularly limited as long as it can exhibit the desired gas barrier performance, and is set appropriately depending on the type of 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 disposed so as to be in direct contact with the resin substrate, and may be, for example, a vapor-deposited film or a coated film.

[0030] The resin substrate is not particularly limited as long as it can support the metal film. Examples of resins 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 copolymers (AS resins); acrylonitrile-butadiene-styrene copolymers (ABS resins); poly(meth)acrylic resins; polycarbonate resins; polyvinyl alcohol-based resins such as polyvinyl alcohol (PVA) and ethylene-vinyl alcohol copolymers (EVOH); saponified ethylene-vinyl ester copolymers; polyamide resins such as various nylons; polyimide resins; polyurethane resins; acetal resins; and cellulose resins.

[0031] The resin substrate may be subjected to a surface treatment to improve adhesion to the metal film.

[0032] The thickness of the resin substrate is not particularly limited and can be set appropriately, and may be, for example, 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, or the like is preferred.

[0034] From the viewpoint of the ability of the partition member packaging material to conform to the contents, the aluminum alloy foil is preferably a soft aluminum alloy foil made of, for example, an annealed aluminum alloy, and from the viewpoint of even better conformability to the contents, an iron-containing aluminum alloy foil is preferred. In the iron-containing aluminum alloy foil (100% by mass), the iron content is preferably 0.1 to 9.0% by mass, more preferably 0.5 to 2.0% by mass. By setting the iron content to 0.1% by mass or more, a partition member packaging material with better conformability can be obtained. By setting the iron content to 9.0% by mass or less, a partition member packaging material with better flexibility can be obtained. Examples of soft aluminum alloy foils include aluminum alloy foils having a composition specified in JIS H4160:1994 A8021H-O, JIS H4160:1994 A8079H-O, JIS H4000:2014 A8021P-O, or JIS H4000:2014 A8079P-O. Silicon, magnesium, copper, manganese, etc. may be added as needed. Softening can be achieved by annealing or other methods.

[0035] Examples of stainless steel foil include austenitic, ferritic, austenitic-ferritic, martensitic, and precipitation hardened stainless steel foils. From the viewpoint of providing an exterior material for a partition member with excellent conformability, the stainless steel foil is preferably made of austenitic stainless steel.

[0036] Specific examples of austenitic stainless steels that can be used to form the stainless steel foil include SUS304, SUS301, and SUS316L, with SUS304 being particularly preferred.

[0037] In the case of a metal foil, the thickness of the metal layer 1 may be, for example, about 6 to 200 μm, as long as it functions as a metal layer with gas barrier properties against gases such as oxygen and water vapor. The thickness of the metal layer 1 is preferably about 85 μm or less, more preferably about 50 μm or less, even more preferably about 40 μm or less, and particularly preferably about 35 μm or less. The thickness of the metal layer 1 is preferably about 9 μm or more, and even more preferably about 10 μm or more. Preferred thickness ranges for the metal layer 1 include about 9 to 85 μm, about 9 to 50 μm, about 9 to 40 μm, about 9 to 35 μm, about 10 to 85 μm, about 10 to 50 μm, about 10 to 40 μm, and about 10 to 35 μm. When the metal layer 1 is made of an aluminum alloy foil, the above-mentioned ranges are particularly preferred. From the viewpoint of imparting high conformability and high rigidity to the exterior material 10 for partition members, the thickness of the metal layer 1 is preferably about 35 μm or more, more preferably about 45 μm or more, even more preferably about 50 μm or more, and even more preferably about 55 μm or more, and is preferably about 200 μm or less, more preferably about 85 μm or less, even more preferably about 75 μm or less, and even more preferably about 70 μm or less. Preferred ranges are 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. The high conformability of the partition member exterior material 10 makes it easy for the partition member exterior material 10 to conform to the contents. Furthermore, the increased rigidity of the partition member exterior material 10 contributes to a high level of sealing of the contents. In particular, when the metal layer 1 is made of stainless steel foil, the thickness of the stainless steel foil is preferably about 60 μm or less, more preferably about 50 μm or less, even more preferably about 40 μm or less, even more preferably about 30 μm or less, and particularly preferably about 25 μm or less. The thickness of the stainless steel foil is preferably about 10 μm or more, more preferably about 15 μm or more.Preferred ranges for 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 is provided with a corrosion-resistant coating at least on the surface facing the heat-sealable resin layer 2. The metal layer 1 may be provided with a corrosion-resistant coating only on the surface facing the heat-sealable resin layer 2, or may be provided with a corrosion-resistant coating on both surfaces of the metal layer 1.

[0039] Here, the term "corrosion-resistant coating" refers to a thin film formed on the surface of a metal layer by, for example, hydrothermal conversion treatment such as boehmite treatment, chemical conversion treatment, anodizing treatment, plating treatment using nickel or chromium, or corrosion prevention treatment using a coating agent, to provide the metal layer with corrosion resistance (e.g., acid resistance, alkali resistance, etc.). Specifically, the corrosion-resistant coating refers to a coating that improves the acid resistance of the metal layer (acid-resistant coating) or a coating that improves the alkali resistance of the metal layer (alkali-resistant coating). The corrosion-resistant coating may be formed by one type of treatment or a combination of two or more types. Furthermore, the corrosion-resistant coating may be formed in a single layer or in multiple layers. Furthermore, among these treatments, hydrothermal conversion treatment and anodizing treatment dissolve the metal foil surface with a treatment agent to form a metal compound with excellent corrosion resistance. These treatments may also be included in the definition of chemical conversion treatment. In this disclosure, the corrosion-resistant coating is also referred to as metal layer 1.

[0040] The corrosion-resistant coating prevents delamination between the metal layer 1 (e.g., aluminum alloy foil) and an adjacent layer on the heat-sealable resin layer 2 side (e.g., heat-sealable resin layer 2, adhesive layer 3, resin layer 4, etc.), prevents dissolution and corrosion of the surface of the metal layer 1 due to moisture from the contents of the partition member, and in particular 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 also improves the adhesion (wettability) of the metal layer surface, thereby preventing delamination between the metal layer and an adjacent layer.

[0041] Various corrosion-resistant coatings formed by chemical conversion treatments are known, including corrosion-resistant coatings 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 chromate chromate treatment, phosphate chromate treatment, phosphate-chromate treatment, and chromate treatment. Examples of chromium compounds used in these treatments include chromium nitrate, chromium fluoride, chromium sulfate, chromium acetate, chromium oxalate, chromium biphosphate, chromate acetylacetate, chromium chloride, and potassium chromium sulfate. Examples of phosphorus compounds used in these treatments include sodium phosphate, potassium phosphate, ammonium phosphate, and polyphosphoric acid. Examples of chromate treatments include etching chromate treatment, electrolytic chromate treatment, and paint-on chromate treatment, with paint-on chromate treatment being preferred. This paint-type chromate treatment involves first degreasing at least the inner surface of a metal layer (e.g., aluminum alloy foil) using a well-known method such as alkaline immersion, electrolytic cleaning, acid pickling, electrolytic pickling, or acid activation, and then coating the degreased surface with a treatment solution primarily composed of a metal phosphate (e.g., chromium phosphate, titanium phosphate, zirconium phosphate, zinc phosphate, or a mixture of these metal salts), a treatment solution primarily composed of a nonmetallic phosphate and a mixture of these nonmetallic salts, or a treatment solution consisting of a mixture of these with a synthetic resin or the like, using a well-known coating method such as roll coating, gravure printing, or immersion, and then drying. The treatment solution can be, for example, water, alcoholic solvents, hydrocarbon solvents, ketone solvents, ester solvents, or ether solvents, with water being preferred. The resin component used here may be a polymer such as a phenolic resin or an acrylic resin, or may be a chromate treatment using an aminated phenol polymer having repeating units represented by the following general formulas (1) to (4): In the aminated phenol polymer, the repeating units represented by the following general formulas (1) to (4) may be contained alone or in any combination of two or more types.The acrylic resin is preferably polyacrylic acid, an acrylic acid methacrylic acid ester copolymer, an acrylic acid maleic acid copolymer, an acrylic acid styrene copolymer, or a derivative thereof such as a sodium salt, an ammonium salt, or an amine salt. A derivative of polyacrylic acid, such as an ammonium salt, a sodium salt, or an amine salt of polyacrylic acid, is particularly preferred. In the present disclosure, polyacrylic acid refers to a polymer of acrylic acid. The acrylic resin is also preferably a copolymer of acrylic acid and a dicarboxylic acid or a dicarboxylic acid anhydride, or an ammonium salt, a sodium salt, or an amine salt of a copolymer of acrylic acid and a dicarboxylic acid or a dicarboxylic acid anhydride. Only one type of acrylic resin may be used, or two or more types may be mixed and used.

[0042] [ka]

[0043] [ka]

[0044] [ka]

[0045] [ka]

[0046] In the 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. 1 and R 2 are the same or different and represent a hydroxy group, an alkyl group, or a hydroxyalkyl group. 1 and R 2Examples of the alkyl group represented by X and R include linear or branched alkyl groups having 1 to 4 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, and tert-butyl. 1 and R 2 Examples of the hydroxyalkyl group represented by the formula (1) include a linear or branched alkyl group having 1 to 4 carbon atoms substituted with one hydroxy group, such as a hydroxymethyl group, a 1-hydroxyethyl group, a 2-hydroxyethyl group, a 1-hydroxypropyl group, a 2-hydroxypropyl group, a 3-hydroxypropyl group, a 1-hydroxybutyl group, a 2-hydroxybutyl group, a 3-hydroxybutyl group, and a 4-hydroxybutyl group. 1 and R 2 The alkyl group and hydroxyalkyl group represented by the formula (1) may be the same or different. In the 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 repeating units represented by the 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 can be prepared, for example, by polycondensing a phenol compound or a naphthol compound with formaldehyde to produce a polymer comprising repeating units represented by the formula (1) or (3), and then polycondensing the polymer with formaldehyde and an amine (R 1 R 2 NH) to the functional group (-CHNR 1 R 2 The aminated phenol polymers can be used singly or in combination of two or more.

[0047] Another example of a corrosion-resistant coating 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 a rare earth element oxide sol, an anionic polymer, and a cationic polymer is applied. The coating agent may further contain phosphoric acid or a phosphate salt, and a crosslinking agent for crosslinking the polymer. The rare earth element oxide sol has rare earth element oxide fine particles (e.g., particles with an average particle size of 100 nm or less) dispersed in a liquid dispersion medium. Examples of rare earth element oxides include cerium oxide, yttrium oxide, neodymium oxide, and lanthanum oxide, with cerium oxide being preferred from the perspective of further improving adhesion. The rare earth element oxide contained in the corrosion-resistant coating can be used alone or in combination of two or more. The liquid dispersion medium for the rare earth element oxide sol can be various solvents such as water, alcohol-based solvents, hydrocarbon-based solvents, ketone-based solvents, ester-based solvents, and ether-based solvents, with water being preferred. Preferred examples of cationic polymers include polyethyleneimine, ionic polymer complexes composed of polyethyleneimine and a polymer having a carboxylic acid, primary amine-grafted acrylic resins in which a primary amine is graft-polymerized onto an acrylic backbone, polyallylamine or its derivatives, and aminated phenols. Preferred anionic polymers are poly(meth)acrylic acid or its salts, or copolymers primarily composed of (meth)acrylic acid or its salts. The crosslinking agent is preferably at least one selected from the group consisting of a compound having a functional group selected from an isocyanate group, a glycidyl group, a carboxyl group, and an oxazoline group, and a silane coupling agent. The phosphoric acid or phosphoric acid salt is preferably a condensed phosphoric acid or a condensed phosphate salt.

[0048] An example of a corrosion-resistant coating is one formed by applying a solution of phosphoric acid in which fine particles of metal oxides such as aluminum oxide, titanium oxide, cerium oxide, and tin oxide, or barium sulfate, are dispersed to the surface of a metal layer and then baking the coating at 150°C or higher.

[0049] The corrosion-resistant coating may have a laminated structure, if necessary, by further laminating at least one of a cationic polymer and an anionic polymer, such as those mentioned above.

[0050] The composition of the corrosion-resistant coating can be analyzed using, for example, time-of-flight secondary ion mass spectrometry. As will be described later, in the present disclosure, X-ray photoelectron spectrometry is used to detect Cr, Zr, and the like in the corrosion-resistant coating.

[0051] From the viewpoint of more suitably exerting the effects of the present disclosure, the corrosion-resistant coating formed on the surface of the metal layer 1 facing the thermally adhesive resin layer 2 preferably has an atomic composition ratio of Cr or Zr detected by X-ray photoelectron analysis of 0.1 at% or more, more preferably 0.3 at% or more, and even more preferably 1.0 at% or more. The upper limit of the atomic composition ratio of Cr or Zr is, for example, 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%, and about 1.0 to 10 at%, etc. The atomic composition ratio of Cr or Zr refers to the atomic ratio of Cr or Zr atoms measured by X-ray photoelectron spectroscopy (XPS) when the total number of C, N, O, F, Al, Si, P, S, Cr, and Zr atoms on the corrosion-resistant coating surface is taken as 100 at%. When a corrosion-resistant coating is formed using a treatment solution containing, for example, a chromium (Cr) phosphate or a zirconium (Zr) phosphate as the main component, among the chemical conversion treatments described above, a corrosion-resistant coating can be formed in which 0.1 at% or more of Cr or Zr is detected. When a corrosion-resistant coating is also formed on the surface of the metal layer 1 opposite the heat-sealable resin layer 2, the atomic composition ratio of Cr or Zr determined by X-ray photoelectron spectroscopy is preferably the same as the atomic composition ratio. XPS analysis of the corrosion-resistant coating formed on the surface of the metal layer is performed under the following conditions.

[0052] [XPS analysis of corrosion-resistant coating] Under the following measurement conditions, X-ray photoelectron analysis (XPS analysis) is performed on the surface of each corrosion-resistant film formed on the surface of the metal layer to measure the atomic composition ratio (at %) of each element. <Measurement conditions> Equipment used: Scanning X-ray photoelectron spectrometer Spectral collection conditions Incident X-ray: AlKα (monochromatic X-ray, hν=1486.6eV) X-ray output: 50W (15kV 3.3mA) X-ray beam diameter: 200 μmφ X-ray scan: 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 voltage 1.0 V Low-acceleration ion irradiation conditions: Ion species: Ar+, acceleration voltage: 0.11 kV, emission: 7 mA

[0053] In addition, elements other than Cr and Zr that are detected in the corrosion-resistant coating formed on the surface of the metal layer 1 include, for example, elements such as C, N, and O, and elements such as F, Al, Si, P, and S may also be detected.

[0054] 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 applying chromate treatment, the amount of the corrosion-resistant film formed on the surface of the metal layer 1 is 2 It is desirable that the chromate compound is contained in an amount, in terms of chromium, of about 0.5 to 50 mg, preferably about 1.0 to 40 mg, the phosphorus compound in terms of phosphorus, and the aminated phenol polymer in an amount, in terms of phosphorus, of about 1.0 to 200 mg, preferably about 5.0 to 150 mg, per unit area.

[0055] The thickness of the corrosion-resistant coating is not particularly limited, but is preferably 1 nm or more, more preferably 5 nm or more, and even more preferably 10 nm or more, from the viewpoint of the cohesive strength of the coating and the adhesive strength with the metal layer or the heat-sealable resin layer. It is also preferably 100 nm or less, more preferably 50 nm or less, and even 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, and about 10 to 40 nm. The thickness of the corrosion-resistant coating can be measured by observation with a transmission electron microscope, or by a combination of observation with a transmission electron microscope and energy dispersive X-ray spectroscopy or electron energy loss spectroscopy. Analysis of the composition of the corrosion-resistant coating using time-of-flight secondary ion mass spectrometry can reveal, for example, the presence of secondary ions consisting of Cr, P, and O (e.g., CrPO2 + , CrPO4 - Peaks derived from at least one of the above are detected.

[0056] The chemical conversion treatment is carried out by applying a solution containing a compound used to form a corrosion-resistant coating to the surface of the metal layer by bar coating, roll coating, gravure coating, immersion, or other methods, and then heating the metal layer to a temperature of approximately 70 to 200°C. Furthermore, before applying the chemical conversion treatment to the metal layer, the metal layer may be subjected to a degreasing treatment using an alkali immersion method, electrolytic cleaning, acid cleaning, electrolytic acid cleaning, or other methods. By performing such a degreasing treatment, the chemical conversion treatment of the surface of the metal layer can be carried out more efficiently. Furthermore, using an acid degreasing agent prepared by dissolving a fluorine-containing compound in an inorganic acid for the degreasing treatment not only degreases the metal foil but also forms a passive metal fluoride. In such cases, only the degreasing treatment may be performed.

[0057] [Thermal adhesive resin layer 2] In the partition member exterior packaging material of the present disclosure, the heat-sealable resin layer 2 corresponds to the innermost layer. The heat-sealable resin layer 2 is a layer (sealant layer) that functions to seal the contents (e.g., coolant) when the partition member exterior packaging material of the present disclosure is used to produce a partition member. When the partition member exterior packaging material is used to seal the contents (e.g., coolant) of 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 partition member exterior packaging materials.

[0058] 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 skeleton, such as polyolefin and acid-modified polyolefin, are preferred. The presence of a polyolefin skeleton in the resin constituting the heat-sealable resin layer 2 can be determined by, for example, infrared spectroscopy, gas chromatography mass spectrometry, or the like. Furthermore, when the resin constituting the heat-sealable resin layer 2 is analyzed by infrared spectroscopy, a peak derived from maleic anhydride is preferably detected. For example, when maleic anhydride-modified polyolefin is measured by infrared spectroscopy, a peak derived from maleic anhydride is detected at a wavenumber of 1760 cm. -1 Near and wave number 1780cm -1 A peak derived from maleic anhydride is detected around . When the thermally adhesive resin layer 2 is a layer made of maleic anhydride-modified polyolefin, a peak derived from maleic anhydride is detected when measured by infrared spectroscopy. However, if the degree of acid modification is low, the peak becomes small and may not be detected. In such cases, analysis can be performed by nuclear magnetic resonance spectroscopy.

[0059] The thermally adhesive resin layer 2 preferably contains a resin having a polyolefin skeleton as a main component, more preferably a polyolefin as a main component, and even more preferably polypropylene as a main component. Here, "main component" refers to a resin component whose content 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 of the resin components contained in the thermally adhesive resin layer 2. For example, "the thermally adhesive resin layer 2 contains polypropylene as a main component" refers to a resin component whose content 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 of the resin components contained in the thermally adhesive resin layer 2.

[0060] Specific examples of polyolefins include polyethylenes such as low-density polyethylene, medium-density polyethylene, high-density polyethylene, and linear low-density polyethylene; ethylene-α-olefin copolymers; polypropylenes 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 ethylene-butene-propylene terpolymers. Among these, polypropylene is preferred. When the polyolefin resin is a copolymer, it may be a block copolymer or a random copolymer. These polyolefin resins may be used alone or in combination of two or more.

[0061] The polyolefin may also be a cyclic polyolefin. Cyclic polyolefins are copolymers of olefins and cyclic monomers, and examples of olefins constituting the cyclic polyolefin include ethylene, propylene, 4-methyl-1-pentene, styrene, butadiene, and isoprene. Examples of cyclic monomers constituting the cyclic polyolefin include cyclic alkenes such as norbornene; and cyclic dienes such as cyclopentadiene, dicyclopentadiene, cyclohexadiene, and norbornadiene. Among these, preferred are cyclic alkenes, and more preferred are norbornene.

[0062] The polyolefin may also be an acid-modified polyolefin. An acid-modified polyolefin is a polymer modified by block polymerization or graft polymerization of a polyolefin with an acid component. Examples of the acid-modified polyolefin include the above-mentioned polyolefins, copolymers of the above-mentioned polyolefins with polar molecules such as acrylic acid or methacrylic acid, and polymers such as crosslinked polyolefins. Examples of the acid component used for acid modification include carboxylic acids or anhydrides thereof, such as maleic acid, acrylic acid, itaconic acid, crotonic acid, maleic anhydride, and itaconic anhydride.

[0063] 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 it with an acid component, or by block polymerizing or graft polymerizing an acid component onto the cyclic polyolefin. The acid-modified cyclic polyolefin is the same as described above. The acid component used for the acid modification is the same as the acid component used for the modification of the polyolefin.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] The heat-fusible resin layer 2 may contain additives such as an anti-blocking agent, a lubricant, a flame retardant, and a filler.

[0068] The melting point of the heat-sealable resin layer 2 varies depending on the material, but is preferably 120°C or higher, more preferably 130°C or higher, and even more preferably 140°C or higher. In a structure in which a partition member is disposed between multiple heat-generating elements, if any of the heat-generating elements generates abnormal heat, heat is released from the heat-generating element, causing the temperature of the partition member located near that heat-generating element to rise. If the temperature of the partition member exceeds the melting point of the heat-sealable resin layer, the heat-sealable resin layer melts, making the sealed portion of the partition member exterior material more likely to peel. Furthermore, as the temperature of the partition member rises, the temperature of the contents (e.g., a coolant containing water) sealed in the partition member also rises, increasing the vapor pressure of the contents and causing an increase in the internal pressure of the partition member. If the internal pressure of the partition member exceeds the welding strength of the heat-sealable resin layer at the sealed portion of the partition member exterior material, the sealed portion of the partition member exterior material is more likely to peel. Furthermore, as described below, the coolant preferably contains water. Therefore, if the melting point of the heat-fusible resin layer is within the above range, peeling of the sealing portion of the partition member exterior material can be suppressed in the above structure under normal conditions.

[0069] On the other hand, the melting point of the heat-sealing resin layer is, for example, preferably 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 structure, the sealing portion of the partition member exterior material is more likely to peel off in the event of abnormal heat generation. When the sealing portion of the partition member exterior material peels off, coolant is released from the partition member, thereby cooling the abnormal heat-generating body. This makes it possible to suppress thermal runaway.

[0070] The melting point of the heat-sealable resin layer is measured using a differential scanning calorimeter (DSC) by the following method. First, the heat-sealable resin layer is peeled off from the partition member exterior material to obtain a sample of approximately 10 mg. This sample is placed in an aluminum cell, and using the differential scanning calorimeter, the sample is heated 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. The sample is then cooled to 20°C at a heating rate of 10°C / min, held at that temperature for 10 minutes, and then heated again to 300°C at a heating rate of 10°C / min (second heating). The melting point of the heat-sealable resin layer is determined by the intersection of the tangent to the melting point observed during the second heating and the baseline of the DSC curve on the lower side of the melting point.

[0071] Furthermore, the heat-sealable resin layer 2 may contain additives such as a lubricant, an antiblocking agent, a flame retardant, a filler, etc., as needed. When the heat-sealable resin layer 2 contains a lubricant, the conformability of the partition member exterior material can be improved. The lubricant is not particularly limited, and known lubricants can be used.

[0072] The lubricant is not particularly limited, but preferably an amide-based lubricant is used. Specific examples of the lubricant include those exemplified for the protective layer 6. The lubricant may be used alone or in combination of two or more types, and a combination of two or more types is preferred.

[0073] In the present disclosure, from the viewpoint of improving the conformability of the exterior material for partition members, it is preferable that a lubricant be 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 is used. Specific examples of amide-based lubricants include saturated fatty acid amides, unsaturated fatty acid amides, substituted amides, methylolamides, saturated fatty acid bisamides, unsaturated fatty acid bisamides, fatty acid ester amides, and aromatic bisamides. Specific examples of saturated fatty acid amides include lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, and hydroxystearic acid amide. Specific examples of unsaturated fatty acid amides include oleic acid amide and erucic acid amide. Specific examples of substituted amides include N-oleyl palmitic acid amide, N-stearyl stearic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, and N-stearyl erucic acid amide. Specific examples of methylolamides include methylol stearic acid amide. Specific examples of 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 adipamide, and N,N'-distearyl sebacic acid amide. Specific examples of unsaturated fatty acid bisamides include ethylene bisoleic acid amide, ethylene biserucic acid amide, hexamethylene bisoleic acid amide, N,N'-dioleyl adipamide, and N,N'-dioleyl sebacic acid amide. Specific examples of fatty acid ester amides include stearamidoethyl stearate. Specific examples of aromatic bisamides include m-xylylene bisstearic acid amide, m-xylylene bishydroxystearic acid amide, and N,N'-distearylisophthalic acid amide.The lubricant may be used alone or in combination of two or more kinds, and it is preferable to use a combination of two or more kinds.

[0074] When a lubricant is present on the surface of the heat-sealable resin layer 2, the amount of the lubricant is not particularly limited. However, from the viewpoint of improving the conformability of the exterior material for a partition member, the amount of the lubricant is preferably about 1 mg / m 2 or more, more preferably about 3 mg / m 2 or more, more preferably about 5 mg / m 2 or more, more preferably about 10 mg / m 2 or more, 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 The preferred range is 1 to 50 mg / m 2 degree, 1~40mg / m 2 degree, 3~50mg / m 2 degree, 3~40mg / m 2 degree, 5~50mg / m 2 degree, 5~40mg / m 2 degree, 10~50mg / m 2 degree, 10~40mg / m 2 degree, 15~50mg / m 2 degree, 15~40mg / m 2 The degree of

[0075] When a lubricant is present inside the heat-sealable resin layer 2, the amount thereof is not particularly limited, but from the viewpoint of improving the conformability of the partition member exterior material, it is preferably about 100 ppm or more, more preferably about 300 ppm or more, even more preferably about 500 ppm or more, and is preferably about 3000 ppm or less, more preferably about 2000 ppm or less, and 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-sealable resin layer 2, the above amount of lubricant is the total amount of lubricant. Furthermore, when two or more types of lubricants are present inside the heat-sealable resin layer 2, the amount of the first type of lubricant is not particularly limited, but from the viewpoint of improving the conformability of the exterior material for partition members, it is preferably about 100 ppm or more, more preferably about 300 ppm or more, even more preferably about 500 ppm or more, and is preferably about 3000 ppm or less, more preferably about 2000 ppm or less, and 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 the second type of lubricant is not particularly limited, but from the viewpoint of improving the conformability of the exterior material for partition members, it is preferably about 50 ppm or more, more preferably about 100 ppm or more, and even more preferably about 200 ppm or more, and is preferably about 1500 ppm or less, more preferably about 1000 ppm or less, and 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.

[0076] The lubricant present on the surface of the heat-sealable resin layer 2 may be a lubricant exuded from the resin constituting the heat-sealable resin layer 2, or a lubricant applied to the surface of the heat-sealable resin layer 2.

[0077] The thickness of the heat-sealable resin layer 2 is not particularly limited as long as it can heat-seal the heat-sealable resin layers together to seal the contents, but may be, for example, 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 below 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 below 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.

[0078] [Adhesive layer 3] 2 to 5, the exterior packaging material 10 for partition members of the present disclosure may have an adhesive layer 3 between the metal layer 1 and the heat-sealable resin layer 2, as needed. The adhesive layer 3 is a layer that is in contact with the metal layer 1 on the inner side of the metal layer 1 and enhances the adhesive strength between the metal layer 1 and layers (such as the heat-sealable resin layer 2 and the resin layer 4) that are further inside the metal layer 1. When the resin layer 4 described below is present 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 to bond these layers together.

[0079] The adhesive layer 3 is formed from an adhesive capable of bonding the metal layer 1 to an adjacent layer. There are no limitations on the adhesive used to form the adhesive layer 3, and it may be any of a chemical reaction type, a solvent volatilization type, a hot melt type, a hot pressure type, etc. It may also be a two-component curing adhesive (two-component adhesive), a one-component curing adhesive (one-component adhesive), or a resin that does not involve a curing reaction. The adhesive layer 3 may be a single layer or multiple layers.

[0080] 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.

[0081] In the present disclosure, from the viewpoint of further strengthening the adhesion between the metal layer 1 and the adjacent layer (for example, increasing the adhesive strength in a humid and hot environment), the resin used to form the adhesive layer 3 preferably contains a polyolefin skeleton. That is, it is particularly preferable that the adhesive layer 3 be formed from a polyolefin-based adhesive.

[0082] In the adhesive layer 3, examples of resins containing a polyolefin skeleton include the polyolefins, acid-modified polyolefins, cyclic polyolefins, and acid-modified cyclic polyolefins exemplified for the heat-sealable resin layer 2. From the viewpoint of firmly adhering the metal layer 1 to the adjacent layer, the adhesive layer 3 preferably contains an acid-modified polyolefin. Examples of acid-modified components include dicarboxylic acids such as maleic acid, itaconic acid, succinic acid, and adipic acid, as well as their anhydrides, acrylic acid, and methacrylic acid. However, maleic anhydride is most preferred from the viewpoints of ease of modification and versatility. From the viewpoint of the heat resistance of the exterior material for partition members, 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 to form the adhesive layer 3 contains a polyolefin skeleton, the adhesive layer 3 preferably contains a resin containing a polyolefin skeleton as a main component, more preferably an acid-modified polyolefin as a main component, and even more preferably an acid-modified polypropylene as a main component. Here, "main component" refers to a resin component that accounts for, 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 of the resin components contained in the adhesive layer 3. For example, "the adhesive layer 3 contains acid-modified polypropylene as a main component" refers to a resin component that accounts for, 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 of the acid-modified polypropylene among the resin components contained in the adhesive layer 3.

[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] Furthermore, 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 heterocycle, a C═N bond, and a COC bond. Examples of curing agents having a heterocycle include curing agents having an oxazoline group and curing agents having an epoxy group. Examples of curing agents having a C═N bond include curing agents having an oxazoline group and curing agents having an isocyanate group. Examples of curing agents having a COC bond include curing agents having an oxazoline group and curing agents having an epoxy group. Whether the adhesive layer 3 is a cured product of a resin composition containing such a curing agent can be confirmed by, for example, gas chromatography mass spectrometry (GCMS), infrared spectroscopy (IR), time-of-flight secondary ion mass spectrometry (TOF-SIMS), X-ray photoelectron spectroscopy (XPS), or other methods.

[0088] The compound having an isocyanate group is not particularly limited, but from the viewpoint of effectively increasing 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 is a compound having two or more isocyanate groups. Specific examples of polyfunctional isocyanate curing agents include pentane diisocyanate (PDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymers or nurates thereof, mixtures of these, and copolymers with other polymers. Other examples include adducts, biurets, and isocyanurates.

[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 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.

[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. Examples of commercially available products include the Epocross series manufactured by Nippon Shokubai Co., Ltd.

[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 mass %, and more preferably in the range of 0.5 to 40 mass %, in the resin composition constituting the adhesive layer 3. This can effectively improve the adhesion between the metal layer 1 and the adhesive layer 3.

[0092] An example of a compound having an epoxy group is an epoxy resin. 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 2,000, more preferably about 100 to 1,000, 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) under conditions using polystyrene as a standard sample.

[0093] Specific examples of epoxy resins include glycidyl ether derivatives of trimethylolpropane, bisphenol A diglycidyl ether, modified bisphenol A diglycidyl ether, bisphenol F glycidyl ether, novolac glycidyl ether, glycerin polyglycidyl ether, polyglycerin polyglycidyl ether, etc. One type of epoxy resin may be used alone, or two or more types may be used in combination.

[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 polyurethane is not particularly limited, and any known polyurethane can be used. The adhesive layer 3 may be, for example, a cured product of two-component curing polyurethane.

[0096] The proportion of polyurethane in 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 adhesive layer 3. This effectively improves the adhesion between metal layer 1 and adhesive layer 3 in an atmosphere containing components that induce corrosion of the metal layer, such as an electrolyte solution.

[0097] In addition, when the adhesive layer 3 is a cured product of a resin composition containing at least one selected from the group consisting of a compound having an isocyanate group, a compound having an oxazoline group, and an epoxy resin, and the acid-modified polyolefin, the acid-modified polyolefin functions as the main agent, and the compound having an isocyanate group, the compound having an oxazoline group, and the compound having an epoxy group each function as a curing agent.

[0098] The adhesive layer 3 may contain a modifier having a carbodiimide group.

[0099] When the adhesive layer 3 is laminated with the metal layer 1, the heat-sealable resin layer 2, 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 adhesive layer 3. Alternatively, the heat-sealable resin that forms the adhesive layer 3 may be formed into a film on the surface of the metal layer 1, the heat-sealable resin layer 2, or the like by extrusion molding, coating, or the like, to form the adhesive layer 3 from a resin film.

[0100] As described above, a polyurethane adhesive or the like may be used to form the adhesive layer 3. However, as described above, from the viewpoint of further strengthening the adhesion between the metal layer 1 and the adjacent layer (for example, increasing the adhesive strength in a humid and hot environment), it is preferable that the resin used to form the adhesive layer 3 contains a polyolefin skeleton.

[0101] 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.

[0102] The adhesive layer 3 may contain other ingredients as long as they do not impair adhesiveness, such as colorants, thermoplastic elastomers, tackifiers, and fillers.

[0103] 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.

[0104] [Resin layer 4] In the present disclosure, as shown in, for example, Figures 3 to 5, 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.

[0105] 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.

[0106] The resin for forming the resin layer 4 is not particularly limited, and examples thereof include the resins for forming the resin substrate described above, and the resins for forming the protective layer described below.

[0107] The thickness of the resin layer 4 is not particularly limited, as long as the effects of the present disclosure are achieved, and is, for example, 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, and 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.

[0108] [Adhesive layer 5] The adhesive layer 5 is a layer that is provided as necessary to bond the resin layer 4 and the heat-sealable resin layer 2 when the exterior material 10 for partition members of the present disclosure has a resin layer 4 between the metal layer 1 and the heat-sealable resin layer 2.

[0109] The adhesive layer 5 is formed of an adhesive capable of bonding the resin layer 4 and the heat-fusible resin layer 2. The adhesive used to form the adhesive layer 5 is not limited, and examples thereof include the same adhesives as those exemplified for the adhesive layer 3.

[0110] The adhesive component contained in the adhesive that forms adhesive layer 5 is preferably a polyolefin adhesive, a polyurethane adhesive, or the like, similar to adhesive layer 3. For adhesive layer 5, the resin used to form adhesive layer 5 also preferably contains a polyolefin skeleton, from the viewpoint of bonding resin layer 4 and heat-fusible resin layer 2 more firmly (for example, increasing adhesive strength in a humid and hot environment). It is also preferable that adhesive layer 5 is formed from the same adhesive as adhesive layer 3.

[0111] Similarly to the adhesive layer 3, the adhesive layer 5 may contain other components as long as they do not impair adhesion, such as colorants, thermoplastic elastomers, tackifiers, and fillers.

[0112] The thickness of adhesive layer 5 is not particularly limited as long as it can bond resin layer 4 and heat-fusible resin layer 2, but is, for example, about 1 μm or more, or about 2 μm or more. Also, the thickness of adhesive layer 5 is, for example, about 10 μm or less, or about 5 μm or less. Examples of preferred thickness ranges for adhesive layer 5 include about 1 to 10 μm, about 1 to 5 μm, about 2 to 10 μm, and about 2 to 5 μm.

[0113] [Protective layer 6] The protective layer 6 is a layer that is provided as needed on the outer side of the metal layer 1 of the partition member packaging material 10 of the present disclosure (the side opposite the heat-sealable resin layer 2) for the purpose of protecting the outside of the partition member packaging material 10.

[0114] The material for forming the protective layer 6 is not particularly limited as long as it has the function of a protective layer, that is, the function of protecting at least the outside of the partition member exterior material 10. The protective layer 6 can be formed using, for example, a resin, and the resin may contain an additive described below.

[0115] 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.

[0116] 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.

[0117] The protective layer 6 preferably contains these resins as a main component, and more preferably contains polyester or polyamide as a main component. Here, "main component" means that the resin component contained in the protective layer 6 accounts for, 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 of the resin component. For example, "the protective layer 6 contains polyester or polyamide as a main component" means that the polyester or polyamide content of the resin component contained in the protective layer 6 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.

[0118] Of these, preferred resins for forming the protective layer 6 include polyester and polyamide.

[0119] Specific examples of polyesters include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, and copolymer polyesters. Examples of copolymer polyesters include copolymer polyesters in which ethylene terephthalate is the main repeating unit. Specific examples include copolymer polyesters in which ethylene terephthalate is the main repeating unit and is polymerized with ethylene isophthalate (hereinafter abbreviated as polyethylene (terephthalate / isophthalate)), polyethylene (terephthalate / adipate), polyethylene (terephthalate / sodium sulfoisophthalate), polyethylene (terephthalate / sodium isophthalate), polyethylene (terephthalate / phenyl-dicarboxylate), and polyethylene (terephthalate / decanedicarboxylate). These polyesters may be used alone or in combination of two or more.

[0120] Specific examples of polyamides 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 copolymer polyamides such as nylon 6I, nylon 6T, nylon 6IT, and nylon 6I6T (where I represents isophthalic acid and T represents terephthalic acid), which contain structural units derived from terephthalic acid and / or isophthalic acid; and aromatic polyamides such as polyamide MXD6 (polymetaxylylene adipamide); alicyclic polyamides such as polyamide PACM6 (polybis(4-aminocyclohexyl)methane adipamide); polyamides copolymerized with a lactam component or an isocyanate component such as 4,4'-diphenylmethane diisocyanate; polyesteramide copolymers and polyetheresteramide copolymers, which are copolymers of copolymerized polyamides with polyesters or polyalkylene ether glycols; and polyamides such as copolymers of these. These polyamides may be used singly or in combination of two or more.

[0121] The protective layer 6 preferably includes at least one of a polyester film, a polyamide film, and a polyolefin film, preferably includes at least one of a stretched polyester film, a stretched polyamide film, and a stretched polyolefin film, more preferably includes at least one of a stretched polyethylene terephthalate film, a stretched polybutylene terephthalate film, a stretched nylon film, and a stretched polypropylene film, and even more preferably includes at least one of a biaxially oriented polyethylene terephthalate film, a biaxially oriented polybutylene terephthalate film, a biaxially oriented nylon film, and a biaxially oriented polypropylene film.

[0122] 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 a laminate of resin films formed by co-extrusion of resins into two or more layers. Furthermore, a laminate of resin films formed by co-extrusion of resins into two or more layers may be used as the protective layer 6 without being stretched, or may be uniaxially or biaxially stretched to form the protective layer 6.

[0123] Specific examples of the laminate of two or more resin films in the protective layer 6 include a laminate of a polyester film and a nylon film, a laminate of two or more nylon films, and a laminate of two or more polyester films. A laminate of a stretched nylon film and a stretched polyester film, a laminate of two or more stretched nylon films, or a laminate of two or more stretched polyester films is 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. 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. Furthermore, when the protective layer 6 is a laminate of two or more resin films, the polyester resin film is preferably positioned as the outermost layer of the protective layer 6 because polyester resins are less likely to discolor when an electrolyte solution adheres to the surface. In the laminate of a polyester resin film and a polyamide resin film, preferred ranges of the thickness of the polyester resin film are 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, and about 18 to 28 μm. and about 18 to 23 μm, and preferred ranges for the thickness of the polyamide resin film 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 18 to 33 μm, about 18 to 28 μm, and about 18 to 23 μm.

[0124] When the protective layer 6 is a laminate of two or more resin film layers, the two or more resin film layers may be laminated via an adhesive. Examples of preferred adhesives include the same adhesives as those exemplified for the adhesive layer 3. The method for laminating two or more resin film layers is not particularly limited, and known methods can be used, such as dry lamination, sandwich lamination, extrusion lamination, and thermal lamination, with dry lamination being preferred. When laminating by dry lamination, a polyurethane adhesive is preferably used as the adhesive. In this case, the thickness of the adhesive may be, for example, about 2 to 5 μm. Alternatively, an anchor coat layer may be formed on the resin film before lamination. Examples of the anchor coat layer include the same adhesives as those exemplified for the adhesive layer 3. In this case, the thickness of the anchor coat layer may be, for example, about 0.01 to 1.0 μm.

[0125] Furthermore, additives such as lubricants, flame retardants, antiblocking agents, antioxidants, light stabilizers, tackifiers, and antistatic agents may be present on at least one of the surface and interior of the protective layer 6. Only one type of additive may be used, or two or more types may be mixed and used.

[0126] In the present disclosure, from the viewpoint of improving the conformability of the exterior material for partition members, it is preferable that a lubricant be 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 is used. Specific examples of amide-based lubricants include saturated fatty acid amides, unsaturated fatty acid amides, substituted amides, methylolamides, saturated fatty acid bisamides, unsaturated fatty acid bisamides, fatty acid ester amides, and aromatic bisamides. Specific examples of saturated fatty acid amides include lauric acid amide, palmitic acid amide, stearic acid amide, behenic acid amide, and hydroxystearic acid amide. Specific examples of unsaturated fatty acid amides include oleic acid amide and erucic acid amide. Specific examples of substituted amides include N-oleyl palmitic acid amide, N-stearyl stearic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, and N-stearyl erucic acid amide. Specific examples of methylolamides include methylol stearic acid amide. Specific examples of 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 adipamide, and N,N'-distearyl sebacic acid amide. Specific examples of unsaturated fatty acid bisamides include ethylene bisoleic acid amide, ethylene biserucic acid amide, hexamethylene bisoleic acid amide, N,N'-dioleyl adipamide, and N,N'-dioleyl sebacic acid amide. Specific examples of fatty acid ester amides include stearamidoethyl stearate. Specific examples of aromatic bisamides include m-xylylene bisstearic acid amide, m-xylylene bishydroxystearic acid amide, and N,N'-distearylisophthalic acid amide.The lubricant may be used alone or in combination of two or more kinds, and it is preferable to use a combination of two or more kinds.

[0127] When a lubricant is present on the surface of the protective layer 6, the amount of the lubricant is not particularly limited, but may be, for example, about 3 mg / m 2 or more, preferably about 4 mg / m 2 More than about 5mg / m 2 The amount of lubricant present on the surface of the protective layer 6 is, for example, about 15 mg / m 2 or less, preferably about 14 mg / m 2 Below, about 10mg / m 2 The preferred range of the amount of lubricant present on the surface of the protective layer 6 is 3 to 15 mg / m 2 degree, 3~14mg / m 2 degree, 3~10mg / m 2 degree, 4~15mg / m 2 degree, 4~14mg / m 2 degree, 4~10mg / m 2 degree, 5~15mg / m 2 degree, 5~14mg / m 2 degree, 5~10mg / m 2 The degree of

[0128] The lubricant present on the surface of the protective layer 6 may be a lubricant exuded from the resin that constitutes the protective layer 6, or a lubricant applied to the surface of the protective layer 6.

[0129] The thickness of the protective layer 6 is not particularly limited as long as it functions as a protective layer, but may be, for example, about 3 μm or more, preferably about 10 μm or more. The thickness of the protective layer 6 may be, for example, about 50 μm or less, preferably about 35 μm or less, about 25 μm or less, or about 20 μm or less. The thickness of the protective layer 6 is preferably 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, or about 10 to 20 μm. When the partition member is to be made lighter and thinner, thicknesses of about 3 to 35 μm, about 3 to 25 μm, or about 3 to 20 μm are particularly preferred. When the protective layer 6 is a laminate of two or more resin films, the thickness of each resin film constituting each layer is not particularly limited, but may be, for example, about 2 μm or more, preferably about 10 μm or more, or about 12 μm or more. The thickness of each resin film constituting each layer may be, for example, 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, or about 8 μm or less. Preferred ranges for 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.

[0130] [Adhesive layer 7] The adhesive layer 7 is a layer that is provided as necessary to bond the protective layer 6 and the metal layer 1 when the exterior material 10 for partition members of the present disclosure has a protective layer 6 on the outside of the metal layer 1.

[0131] The adhesive layer 7 is formed of an adhesive capable of bonding the protective layer 6 and the metal layer 1. There are no limitations on the adhesive used to form the adhesive layer 7, and examples thereof include the same adhesives as those exemplified for the adhesive layer 3.

[0132] The adhesive component contained in the adhesive that forms adhesive layer 7 is preferably a polyolefin adhesive, a polyurethane adhesive, or the like, similar to adhesive layer 3. For adhesive layer 7 as well, from the viewpoint of bonding protective layer 6 and metal layer 1 more firmly (for example, increasing adhesive strength in a humid and hot environment), the resin used to form adhesive layer 7 preferably contains a polyolefin skeleton. It is also preferable that adhesive layer 7 is formed from the same adhesive as adhesive layer 3.

[0133] Similarly to the adhesive layers 3 and 5, the adhesive layer 7 may contain other components as long as they do not impair adhesion, such as colorants, thermoplastic elastomers, tackifiers, and fillers. The adhesive layer 7 contains a colorant, which allows the exterior of the partition member exterior material to be colored. Known colorants, such as pigments and dyes, can be used. Only one type of colorant may be used, or two or more types may be mixed together.

[0134] The type of pigment is not particularly limited as long as it does not impair the adhesiveness of the adhesive layer 7. Examples of organic pigments include azo-based, phthalocyanine-based, quinacridone-based, anthraquinone-based, dioxazine-based, indigothioindigo-based, perinone-perylene-based, isoindolenine-based, and benzimidazolone-based pigments, while examples of inorganic pigments include carbon black-based, titanium oxide-based, cadmium-based, lead-based, chromium oxide-based, and iron-based pigments, and other examples include finely powdered mica and fish scale foil.

[0135] Among colorants, carbon black is preferred in order to give the exterior material for partition members a black appearance, for example.

[0136] The average particle size of the pigment is not particularly limited and may be, for example, about 0.05 to 5 μm, and preferably about 0.08 to 2 μm. The average particle size of the pigment is the median size measured with a laser diffraction / scattering particle size distribution measuring device.

[0137] The content of the pigment in the adhesive layer 7 is not particularly limited as long as it colors the exterior material for partition members, and may be, for example, about 5 to 60 mass %, and preferably 10 to 40 mass %.

[0138] The thickness of adhesive layer 7 is not particularly limited as long as it can bond protective layer 6 and metal layer 1, but is, for example, about 1 μm or more, about 2 μm or more. Also, the thickness of adhesive layer 7 is, for example, about 10 μm or less, about 5 μm or less. Preferred ranges for the thickness of adhesive layer 7 include about 1 to 10 μm, about 1 to 5 μm, about 2 to 10 μm, and about 2 to 5 μm.

[0139] [Colored layer] The colored layer is a layer (not shown) that is provided between the protective layer 6 and the metal layer 1 as needed. When the adhesive layer 7 is provided, a colored layer may be provided between the protective layer 6 and the adhesive layer 7, or between the adhesive layer 7 and the metal layer 1. Alternatively, a colored layer may be provided on the outside of the protective layer 6. By providing a colored layer, the exterior material for a partition member can be colored.

[0140] The colored 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. Known colorants such as pigments and dyes can be used as the colorant. Furthermore, only one type of colorant may be used, or two or more types may be mixed together.

[0141] Specific examples of the colorant contained in the colored layer include the same as those exemplified in the section [Adhesive layer 7].

[0142] The exterior packaging material for a partition member according to the present disclosure can be used for a partition member disposed between a plurality of heat generating elements. In the partition member, the exterior packaging material for a partition member can be disposed so as to face the contents (e.g., a coolant) with the heat-sealable resin layer facing the contents (e.g., a coolant) therebetween.

[0143] 3. Manufacturing method of exterior material for partition members The method for producing the partition member exterior material is not particularly limited as long as it can produce a laminate in which the layers of the partition member exterior material of the present disclosure are laminated, and examples include methods that include at least the step of laminating a metal layer 1 and a heat-sealable resin layer 2. As described above, in the partition member exterior material 10 of the present disclosure, layers such as a protective layer 6, an adhesive layer 7, an adhesive layer 3, a resin layer 4, and an adhesive layer 5 can also be laminated as necessary.

[0144] An example of a method for manufacturing an exterior material for partition members according to the present disclosure is as follows: First, a laminate (hereinafter sometimes referred to as "laminate A") is formed in which a protective layer 6, an adhesive layer 7, and a metal layer 1 are laminated in this order. Specifically, laminate A can be formed by a dry lamination method in which an adhesive used to form adhesive layer 7 is applied to protective layer 6 or to metal layer 1, the surface of which has been chemically treated as necessary, by a coating method such as gravure coating or roll coating, and then dried, followed by laminating metal layer 1 or protective layer 6, and curing adhesive layer 7.

[0145] 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 laminated directly on the metal layer 1, the heat-sealable resin layer 2 may be laminated on the metal layer 1 of the laminate A by a method such as thermal lamination or extrusion lamination. 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 may be laminated by, for example, (1) extrusion lamination, (2) thermal lamination, (3) sandwich lamination, or (4) dry lamination. Examples of the (1) extrusion lamination method include a method of laminating the adhesive layer 3 and the heat-sealable resin layer 2 on the metal layer 1 of the laminate A by extrusion (co-extrusion lamination, tandem lamination), etc. Examples of the (2) thermal lamination method include a method of separately forming a laminate in which an adhesive layer 3 and a heat-sealable resin layer 2 are laminated, and laminating this on the metal layer 1 of the laminate A, or a method of forming a laminate in which an adhesive layer 3 is laminated on the metal layer 1 of the laminate A, and laminating this on the heat-sealable resin layer 2. Examples of the (3) sandwich lamination method include a method of pouring a molten adhesive layer 3 between the metal layer 1 of the laminate A and the heat-sealable resin layer 2 that has been previously formed into a sheet, and bonding the laminate A and the heat-sealable resin layer 2 via the adhesive layer 3. Examples of the (4) dry lamination method include a method of solution-coating an adhesive for forming the adhesive layer 3 on the metal layer 1 of the laminate A, drying it, or baking it, and laminating the heat-sealable resin layer 2 that has been previously formed into a sheet on the adhesive layer 3.

[0146] Even when a resin layer 4 is provided between the metal layer 1 and the heat-sealable resin layer 2, an adhesive layer 5 can be further provided, and the layers can be laminated in the following order: metal layer 1, adhesive layer 3, resin layer 4, adhesive layer 5, and heat-sealable resin layer 2, for example, by (1) extrusion lamination, (2) thermal lamination, (3) sandwich lamination, or (4) dry lamination.

[0147] As described above, a laminate is formed which includes, in this order, optional protective layer 6, optional adhesive layer 7, metal layer 1, optional adhesive layer 3, optional resin layer 4, optional adhesive layer 5, and heat-sealable resin layer 2. In order to strengthen the adhesiveness of the optional adhesive layers 3, 5, and 7, the laminate may be further subjected to a heat treatment.

[0148] 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.

[0149] 4. Partition material 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.

[0150] Fig. 6 is a schematic cross-sectional view showing an example of a partition member according to the present disclosure. As shown in Fig. 6, 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 5. 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 having their ends 22 joined by heat fusion, and coolant 21 is enclosed in the bag body.

[0151] 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.

[0152] In the partition member 20, the outer packaging material 10 is a member that encloses the contents of the partition member 20, such as the coolant 21. As described above, the outer packaging material of the partition member 20 is the outer packaging material 10 for a partition member of the present disclosure.

[0153] The contents of the partition member 20 are materials enclosed in the exterior packaging material. Enclosed means sealed inside a bag formed using the exterior packaging material. Because the partition member of the present disclosure is disposed between multiple heat generating elements, the contents of the partition member are typically coolant 21.

[0154] The coolant preferably contains at least one liquid selected from the group consisting of 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.

[0155] 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.

[0156] Examples of esters include alkyl aliphatic carboxylic acid esters, alkyl carbonate diesters, alkyl oxalic acid diesters, fatty acid esters of ethylene glycol, etc. These may be used alone or as a mixture of two or more.

[0157] Examples of ethers include n-butyl ether, n-propyl ether, isoamyl ether, etc. These may be used alone or as a mixture of two or more.

[0158] Examples of ketones include ethyl methyl ketone, diethyl ketone, etc. These may be used alone or as a mixture of two or more.

[0159] Examples of hydrocarbons include heptane, octane, nonane, decane, toluene, xylene, etc. These may be used alone or as a mixture of two or more.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] 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.

[0164] 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.

[0165] The coolant may also contain, for example, an antifreeze, a preservative, and a pH adjuster.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] That is, when a coolant is to be contained in a package formed from the partition member exterior material of the present disclosure, the package is formed so that the heat-sealable resin portion of the partition member exterior material of the present disclosure faces inward (the surface that comes into contact with the coolant). The package may be formed by overlapping two partition member exterior materials with their heat-sealable resins facing each other and heat-sealing the peripheral edges of the overlapped partition member exterior materials, or by folding one partition member exterior material over and overlapping it, and heat-sealing the peripheral edges, as in the example shown in Fig. 8. When folding and stacking, the packaging may be formed by heat-sealing the edges other than the folded edge to form a three-sided seal, as in the example shown in FIG. 8 , or by folding the packaging to form a flange (the area where the heat-sealable resin layers contact each other) and sealing all four sides. Alternatively, if the cooling material can be retained by impregnating a porous material, the packaging may be wrapped around the cooling material, sealing the heat-sealable resin layers together to form a heat-sealed area, and then heat-sealing the openings at both ends to close them. Furthermore, a recess for accommodating the cooling material may be formed in the partition member exterior material by deep drawing or bulging molding. As in the example shown in FIG. 8 , one partition member exterior material may have a recess and the other partition member exterior material may not have a recess, or the other partition member exterior material may also have a recess.

[0170] The partition member of the present disclosure can be used by being disposed between a plurality of heating elements.

[0171] 5. Structure The structure of the present disclosure is a structure having a plurality of heating elements and partition members arranged between the plurality of heating elements, and the partition members are the partition members of the present disclosure described above.

[0172] Fig. 7 is a schematic cross-sectional view showing an example of a structure according to the present disclosure. As shown in Fig. 7, 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. 6. Structure 30 can also have a housing 32 that houses the plurality of heating elements 31 and partition members 20. In structure 30, partition members 20 can also be arranged between the bottom surface of housing 32 and each heating element 31.

[0173] 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.

[0174] 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).

[0175] Examples of the battery include secondary batteries such as lithium ion secondary batteries, lithium ion polymer batteries, all-solid-state lithium ion batteries, semi-solid batteries, quasi-solid batteries, polymer batteries, all-resin batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, nickel-iron batteries, nickel-zinc batteries, silver oxide-zinc batteries, metal-air batteries, and polyvalent cation batteries.

[0176] The uses of the structure 30 of the present disclosure vary depending on the type of heating element 31.

[0177] 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.

[0178] 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]

[0179] The present disclosure will be described in detail below with reference to examples, but the present disclosure is not limited to these examples.

[0180] [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 of the protective layer and the metal layer by dry lamination to produce a laminate in which the protective layer / adhesive layer / metal layer were laminated in this order.

[0181] 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.

[0182] 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.

[0183] [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.

[0184] Next, an unstretched polypropylene film (CPP, thickness 50 μm) was prepared as the heat-sealable resin layer. A biaxially oriented nylon film (thickness 15 μm) was prepared as the resin layer to be disposed between the metal layer and the heat-sealable resin layer. The metal layer side of the obtained laminate was bonded to the resin layer by a dry lamination method using adhesive A described later, and adhesive layer A (thickness after curing: 1.5 μm) / resin layer was laminated on the metal layer. Furthermore, the resin layer side of the obtained laminate was bonded to the heat-sealable resin layer by a dry lamination method using adhesive A described later, and adhesive layer A (thickness after curing: 1.5 μm) / heat-sealable resin layer was laminated on the resin layer. The obtained laminate was then 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 / resin layer / adhesive layer A / heat-sealable resin layer were laminated in this order.

[0185] [Example 3] An exterior packaging material for partition members was obtained in the same manner as in Example 1, except that both sides of the aluminum alloy foil were subjected to chemical conversion treatment using treatment solution B described below instead of treatment solution A to form corrosion-resistant coating B. The thickness of corrosion-resistant coating B was 23 nm.

[0186] [Example 4] An exterior material for partition members comprising a laminate having a protective layer / adhesive layer / metal layer / adhesive layer A / thermally adhesive resin layer laminated in this order 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 C described below instead of treatment solution A to form a corrosion-resistant coating C. The thickness of the corrosion-resistant coating C was 15 nm.

[0187] [Example 5] 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 D described below instead of treatment solution A to form a corrosion-resistant coating D. The thickness of the corrosion-resistant coating D was 17 nm.

[0188] [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.

[0189] [Example 7] 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.

[0190] [Example 8] 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.

[0191] [Example 9] 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 of the protective layer and the metal layer were bonded together by a dry lamination method using adhesive A (thickness after curing: 1.5 μm) described below, to produce a laminate in which the protective layer / adhesive layer / metal layer were laminated in this order.

[0192] 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.

[0193] 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.

[0194] [Example 10] A laminate having a protective layer, adhesive layer A, and metal layer laminated in this order was produced in the same manner as in Example 9. 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.

[0195] Next, an unstretched polypropylene film (CPP, thickness 50 μm) was prepared as the heat-sealable resin layer. A biaxially oriented nylon film (thickness 15 μm) was prepared as the resin layer to be disposed between the metal layer and the heat-sealable resin layer. The metal layer side of the obtained laminate was bonded to the resin layer by a dry lamination method using adhesive A described later, and adhesive layer A (thickness after curing: 1.5 μm) / resin layer was laminated on the metal layer. Furthermore, the resin layer side of the obtained laminate was bonded to the heat-sealable resin layer by a dry lamination method using adhesive A described later, and adhesive layer A (thickness after curing: 1.5 μm) / heat-sealable resin layer was laminated on the resin layer. The obtained laminate was then 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 / resin layer / adhesive layer A / heat-sealable resin layer were laminated in this order.

[0196] [Comparative Example 1] 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.

[0197] Comparative Example 2 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 7, 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.

[0198] [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)

[0199] [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 solution E: Chemical conversion treatment solution containing chromium phosphate and organic resin

[0200] [XPS analysis of corrosion-resistant coating] X-ray photoelectron spectroscopy (XPS analysis) was performed under the following measurement conditions on the surface of the corrosion-resistant coating AE of each aluminum alloy foil used in the Examples and the surface of the aluminum alloy foil used in the Comparative Examples without a corrosion-resistant coating (Ref: untreated ALM), to measure the atomic composition ratio (at%) of each element. This measurement was performed by peeling off 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. <Measurement conditions> Equipment used: "PHI5000VersaProbeIII" (PHI scanning X-ray photoelectron spectrometer) Spectral collection conditions Incident X-ray: AlKα (monochromatic X-ray, hν=1486.6eV) X-ray output: 50W (15kV 3.3mA) X-ray beam diameter: 200 μmφ X-ray scan: 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 voltage 1.0 V Low-acceleration ion irradiation conditions: Ion species: Ar+, acceleration voltage: 0.11 kV, emission: 7 mA

[0201] [Table 1]

[0202] [Expansion evaluation of partition materials] Two sheets of each partition member exterior material were prepared in the Examples and Comparative Examples, measuring 100 mm in diameter and 150 mm in length. The exterior materials were then stacked with the heat-sealable resin layers facing each other, and the outer edges of the three sides were heat-sealed to obtain a bag with an opening on one 150 mm side. Next, a 70 mm x 100 mm glass wool sheet was placed in the bag, and 10 g of water was poured into it. The pressure inside the bag was then reduced to approximately 100 Pa, and the opening of the bag was heat-sealed and sealed (seal width: 10 mm). This resulted in a partition member as a test sample. An accelerated test was performed in which the resulting partition member was stored in a constant temperature bath at a temperature of 90°C and a relative humidity of 10% or less for 30 days. The partition member was examined for expansion after the accelerated test by both visual and tactile inspection. If expansion was confirmed by either method, it was deemed to have expanded. The results are shown in Table 2.

[0203] [Exterior material adhesion evaluation] Each of the partition member exterior materials obtained in the examples and comparative examples had a size of TD 100 mm x MD 150 mm. Using a PCT device (HAST tester PC-R8 manufactured by Hirayama Manufacturing Co., Ltd.), the exterior materials were stored in a humid and hot environment (temperature 120°C, relative humidity 100%, pressure 0.199 MPa) for 16 days. The adhesion strength of the exterior materials was measured before and after storage. The adhesion strength was measured at the interface between the metal layer of the exterior material and the layer on the thermally adhesive resin layer side (the part where the adhesive layer adhered to the metal layer is located). The specific method for measuring adhesion strength is as follows. Each partition member exterior material was further cut into a rectangle of TD 15 mm x MD 100 mm to prepare a measurement sample. Next, the metal layer (aluminum alloy foil) of the measurement sample and the layer bonded to the metal layer via an adhesive layer (thermally adhesive resin layer in Examples 1, 3 to 8 and Comparative Examples 1 and 2, resin layer in Example 2) were partially T-peeled in the MD direction, and then the aluminum alloy foil side and the thermally adhesive resin layer side were fixed to the gripping tools of a tensile tester so that the MD direction was the tensile direction, and measurements were 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.

[0204] [Table 2]

[0205] 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 and a heat-sealable resin layer, The metal layer has a corrosion-resistant coating on the surface facing the heat-sealable resin layer. Item 2. The exterior material for partition members according to Item 1, 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 3. The exterior material for partition members according to Item 1 or 2, wherein the corrosion-resistant coating has a thickness of 1 nm or more. Item 4. The exterior packaging material for a partition member according to any one of Items 1 to 3, further comprising an adhesive layer between the metal layer and the heat-sealable resin layer. Item 5. The exterior material for a partition member according to Item 4, wherein the adhesive layer is formed from a cured product of a polyolefin adhesive. Item 6. An adhesive layer is further provided between the metal 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 resin layer between the adhesive layer and the heat-sealable resin layer. Item 7. The packaging material for a partition member according to any one of Items 1 to 6, further comprising a protective layer on the side of the metal layer opposite to the heat-sealable resin layer side. Item 8. The exterior packaging material for a partition member according to any one of Items 1 to 7, wherein the metal layer contains aluminum. Item 9. The exterior packaging material for a partition member according to any one of Items 1 to 8, wherein the heat-sealable resin layer contains polypropylene. Item 10. The outer packaging material for a partition member according to any one of Items 1 to 9, wherein the heat generating element is a battery. Item 11. A partition member disposed between a plurality of heating elements, The partition member has a content and an exterior material that packages the content, The packaging material is a packaging material for a partition member according to any one of items 1 to 9. Item 12. The partition member according to Item 11, wherein the contents include water. Item 13. The partition member according to Item 11, wherein the heating element is a battery. Item 14. A structure having a plurality of heating elements and partition members arranged between the plurality of heating elements, Item 12. A structure, wherein the partition member is the partition member according to Item 11. Item 15. The structure according to Item 14, wherein the heating element is a battery. Item 16. A method for manufacturing an exterior material for a partition member, which is used for a partition member disposed between a plurality of heat generating elements, The method includes a step of obtaining a laminate in which at least a metal layer and a heat-sealable resin layer are laminated, The method for manufacturing an exterior material for a partition member, wherein the metal layer has a corrosion-resistant coating on the surface facing the heat-sealable resin layer. [Explanation of symbols]

[0206] 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 materials for partition members 20 Partition member 21 Coolant 22 End 30 Structure 31 Heating element 32 Case

Claims

1. An outer covering material for a partition member used for a partition member arranged between a plurality of heat generating elements, The partition member exterior material is composed of a laminate including at least a metal layer and a heat-sealable resin layer, the metal layer has a corrosion-resistant coating on the surface facing the heat-sealable resin layer, An adhesive layer is further provided between the metal layer and the heat-sealable resin layer, The adhesive layer is formed from a cured product of a polyolefin-based adhesive, and is an exterior material for a partition member.

2. The corrosion-resistant coating has an atomic composition ratio of Cr or Zr of 0.1a by X-ray photoelectron analysis. The exterior material for a partition member according to claim 1, wherein the content of the fluorine-containing compound is detected at t% or more.

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

4. An adhesive layer is further provided between the metal layer and the heat-sealable resin layer, The exterior packaging material for a partition member according to claim 1 or 2, further comprising a resin layer between the adhesive layer and the heat-sealable resin layer.

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

6. The exterior material for a partition member according to claim 1 or 2, wherein the metal layer contains aluminum.

7. The exterior packaging material for a partition member according to claim 1 or 2, wherein the heat-sealable resin layer contains polypropylene.

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

9. A partition member disposed between a plurality of heating elements, The partition member has a content and an exterior material that packages the content, The exterior material is the exterior material for a partition member according to claim 1 or 2.

10. The partition member according to claim 9 , wherein the contents include 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, A structure, wherein the partition member is the partition member according to claim 9.

13. 13. The structure of claim 12, 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 heat generating elements, The method includes a step of obtaining a laminate in which at least a metal layer and a heat-sealable resin layer are laminated, the metal layer has a corrosion-resistant coating on the surface facing the heat-sealable resin layer, An adhesive layer is further provided between the metal layer and the heat-sealable resin layer, The method for producing an exterior material for a partition member, wherein the adhesive layer is formed from a cured product of a polyolefin-based adhesive.

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