Separating member outer packaging material, method for manufacturing separating member outer packaging material, separating member, and structure

Abstract

The present invention provides a kind of outer packaging material for partition component, which is used for the outer packaging material for partition component configured between multiple heat-generating bodies, the outer packaging material for partition component is composed of at least a laminated body having a metal layer and a hot melt resin layer, the metal layer has a corrosion-resistant coating on the side of the hot melt resin layer.

Description

Technical Field

[0001] This invention relates to outer packaging materials for partition components, a method for manufacturing outer packaging materials for partition components, partition components, and structures. Background Technology

[0002] In a structure having multiple heating elements, for example, a partition for cooling the heating elements is disposed between the multiple heating elements. The partition is, for example, made of a cooling material and an outer packaging material for packaging the cooling material. (For example, Patent Documents 1-3) For example, Patent Document 1 discloses a battery module in which a cooling unit for storing cooling material is provided near the individual cells in a battery module composed of multiple individual cells. The cooling unit has a packaged portion formed by encapsulating sheet-like components, and a portion of the packaged portion has an opening portion for opening when the individual cells overheat abnormally. In this battery module (structure), the cooling unit is arranged as a separating component between the individual cells, which serve as multiple heat-generating elements.

[0003] Existing technical documents Patent documents 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

[0004] The technical problem that the invention aims to solve For separators positioned between multiple heating elements, dimensional stability is required. However, the inventors of this invention have discovered that the separators sometimes expand due to the presence of gas generated inside the contents (e.g., cooling materials containing water) packaged in the outer packaging material. More specifically, the inventors have discovered a new problem: when the outer packaging material of the separator contains a metal layer, the metal layer reacts with the contents to generate gas, sometimes causing the separator to expand. When the separator expands, the heating elements may become misaligned or compressed, sometimes resulting in a decrease in the characteristics of the heating elements.

[0005] The main objective of this invention is to provide an outer packaging material for a partition that can suppress the expansion of the partition, as well as a partition and structure utilizing the outer packaging material.

[0006] Technical solutions for solving technical problems The inventors of this invention conducted in-depth research to solve the aforementioned technical problems. As a result, they discovered that by making the outer packaging material of the partition member used in the partition member disposed between multiple heating elements consist of a laminate having at least a metal layer and a heat-melting resin layer, and by providing a corrosion-resistant coating on the surface of the metal layer on the side of the heat-melting resin layer, the expansion of the partition member can be suppressed.

[0007] This invention was completed based on these insights and further repeated research. Specifically, this invention provides an embodiment as described below.

[0008] An outer packaging material for a separating component, which is used in a separating component disposed between multiple heating elements. The outer packaging material for the aforementioned partition components is composed of a laminate having at least a metal layer and a heat-melting resin layer. The metal layer has a corrosion-resistant coating on the side of the heat-fusion resin layer.

[0009] Invention Effects According to the present invention, an outer packaging material for a partition member capable of suppressing expansion of the partition member can be provided. Furthermore, according to the present invention, a partition member and a structure utilizing this outer packaging material can also be provided. Attached Figure Description

[0010] Figure 1 This is a schematic diagram illustrating an example of the cross-sectional structure of the outer packaging material for the separator component of the present invention.

[0011] Figure 2 This is a schematic diagram illustrating an example of the cross-sectional structure of the outer packaging material for the separator component of the present invention.

[0012] Figure 3 This is a schematic diagram illustrating an example of the cross-sectional structure of the outer packaging material for the separator component of the present invention.

[0013] Figure 4 This is a schematic diagram illustrating an example of the cross-sectional structure of the outer packaging material for the separator component of the present invention.

[0014] Figure 5 This is a schematic diagram illustrating an example of the cross-sectional structure of the outer packaging material for the separator component of the present invention.

[0015] Figure 6 This is a schematic diagram illustrating an example of the cross-sectional structure of the separator component of the present invention.

[0016] Figure 7 This is a schematic diagram illustrating an example of the cross-sectional structure of the structure of the present invention.

[0017] Figure 8This is a schematic diagram illustrating a method of storing cooling material in a package formed by the separating component of the present invention. Detailed Implementation

[0018] The outer packaging material for the separator of the present invention is an outer packaging material for a separator disposed between multiple heating elements, characterized in that: the outer packaging material for the separator is composed of a laminate having at least a metal layer and a heat-melting resin layer, wherein the metal layer has a corrosion-resistant coating on at least the side of the heat-melting resin layer. By having this configuration, the outer packaging material for the separator of the present invention can suppress the expansion of the separator.

[0019] The outer packaging material for the separator component of the present invention will now be described in detail. In this specification, the numerical range indicated by "~" means "above" or "below". For example, the expression 2 to 15 mm means 2 mm or more and 15 mm or less. In the numerical ranges described in stages in the present invention, the upper or lower limit value described in a certain numerical range can be replaced with the upper or lower limit value of other numerical ranges described in stages. Alternatively, upper and lower limits, upper and lower limits, or lower and lower limits can be combined to form numerical ranges. Furthermore, in the numerical ranges described in the present invention, the upper or lower limit value described in a certain numerical range can be replaced with the value shown in the embodiment.

[0020] Furthermore, in the outer packaging material for separating components, regarding the metal layer 1 described later, its MD (Machine Direction) and TD (Transverse Direction) during the manufacturing process can usually be determined. For example, when metal layer 1 is composed of metal foil such as aluminum alloy foil or stainless steel foil, linear marks called rolling marks are formed on the surface of the metal foil along the rolling direction (RD). The rolling marks are stretched along the rolling direction, so the rolling direction of the metal foil can be determined by observing the surface of the metal foil. In addition, during the manufacturing process of the laminate, the MD of the laminate is usually consistent with the RD of the metal foil, so the rolling direction (RD) of the metal foil can be determined by observing the surface of the metal foil of the laminate, thereby determining the MD of the laminate. In addition, the TD of the laminate is perpendicular to the MD of the laminate, so the TD of the laminate can also be determined.

[0021] Furthermore, when the MD (Mean Density) of the outer packaging material for the separator cannot be determined based on the rolling marks of metal foils such as aluminum alloy foil or stainless steel foil, it can be determined using the following method. One method for confirming the MD of the outer packaging material for the separator is to observe the cross-section of the thermosetting resin layer of the outer packaging material using an electron microscope to confirm the island structure. In this method, the direction parallel to the cross-section with the largest average diameter of the island shape in the direction perpendicular to the thickness direction of the thermosetting resin layer can be determined as the MD. Specifically, for the cross-section along the length direction of the thermosetting resin layer, and for each of the 10 cross-sections (a total of 10 cross-sections) starting from the direction parallel to the cross-section along the length direction and changing the angle by 10 degrees each time until the cross-section is perpendicular to the cross-section along the length direction, electron microscope images are used to observe and determine the island structure. Next, the shape of each island is observed on each cross-section. For the shape of each island, the straight-line distance connecting the leftmost end and the rightmost end of the direction perpendicular to the thickness direction of the thermosetting resin layer is defined as the diameter y. In each cross-section, the average value of the first 20 diameters y is calculated in descending order of the island shape. The direction parallel to the cross section with the largest average diameter y of the island's shape is determined as MD.

[0022] 1. Layered structure of outer packaging material for separating components The outer packaging material 10 for the separator component of the present invention is, for example, Figures 1 to 5 As shown, it is composed of a laminate having at least a metal layer 1 and a heat-melting resin layer 2 sequentially from the outside. In the outer packaging material 10 for the separating components, the heat-melting resin layer 2 is the innermost layer. Figure 6 As shown, in the separator 20 of the present invention, the contents of the separator 20 (e.g., cooling material 21) are housed in a space formed by thermally fusing the peripheral portions of the heat-melting resin layers 2 of the separator outer packaging material 10 to each other in a state where they are facing each other. In the laminate constituting the separator outer packaging material 10 of the present invention, with metal layer 1 as a reference, the side closer to the heat-melting resin layer 2 than metal layer 1 is the inner side, and the side opposite to metal layer 1 is the outer side.

[0023] The metal layer 1 has a corrosion-resistant coating on at least the side of the heat-fusion resin layer 2. The corrosion-resistant coating may be present only on the side of the heat-fusion resin layer 2 of the metal layer 1, or it may be present on both sides of the metal layer 1.

[0024] For example, the outer packaging material for the separating components is 10 Figures 2 to 5As shown, an adhesive layer 3 may be provided between the metal layer 1 and the thermoplastic resin layer 2 (or resin layer 4, etc., as described later) to improve the adhesion between these layers, etc. The adhesive layer 3 is in contact with the metal layer 1 on the inner side and improves the adhesion to layers (thermoplastic resin layer 2, resin layer 4, etc.) that are further inside the metal layer 1.

[0025] Additionally, the outer packaging material 10 for the separating components is, for example, Figures 3 to 5 As shown, a resin layer 4 may be present between the metal layer 1 and the thermosetting resin layer 2. As described above, the metal layer 1 and the resin layer 4 can be bonded together via an adhesive layer 3. Furthermore, when the resin layer 4 is present, as... Figure 3 As shown, resin layer 4 and heat-fused resin layer 2 can be directly bonded, or as shown in the diagram. Figure 4 , Figure 5 As shown, resin layer 4 and thermoplastic resin layer 2 are bonded together via adhesive layer 5.

[0026] Additionally, the outer packaging material 10 for the separating components is, for example, Figure 5 As shown, a protective layer 6 can be located further outward than the metal layer 1. When the protective layer 6 is present, it can be directly bonded to the metal layer 1 (illustration omitted), or it can be as follows: Figure 5 As shown, the protective layer 6 and the metal layer 1 are bonded together via the adhesive layer 7.

[0027] There are no particular limitations on the thickness of the laminated body constituting the outer packaging material 10 for the partition component. From the viewpoint of cooling efficiency of the heating element and cost reduction, examples of thicknesses of approximately 210 μm or less, preferably approximately 190 μm or less, approximately 180 μm or less, approximately 155 μm or less, and approximately 120 μm or less are acceptable. Furthermore, from the viewpoint of maintaining the function of the outer packaging material for the partition component in protecting the contents, examples of thicknesses of approximately 35 μm or more, approximately 45 μm or more, and approximately 60 μm or more are preferred. Furthermore, regarding the preferred range of the laminated body constituting the outer packaging material 10 for the separating component, examples include approximately 35–210 μm, approximately 35–190 μm, approximately 35–180 μm, approximately 35–155 μm, approximately 35–120 μm, approximately 45–210 μm, approximately 45–190 μm, approximately 45–180 μm, approximately 45–155 μm, approximately 45–120 μm, approximately 60–210 μm, approximately 60–190 μm, approximately 60–180 μm, approximately 60–155 μm, and approximately 60–120 μm.

[0028] In the outer packaging material 10 for the separator component, the ratio of the total thickness of the protective layer 6, the adhesive layer 7, the metal layer 1, the adhesive layer 3, the resin layer 4, the adhesive layer 5, and the heat-melting resin layer 2, which are provided as needed, to the thickness (total thickness) of the laminate constituting the outer packaging material 10 for the separator component is preferably 90% or more, more preferably 95% or more, and even more preferably 98% or more. As a specific example, when the outer packaging material 10 for the separator component of the present invention includes the protective layer 6, the adhesive layer 7, the metal layer 1, the adhesive layer 3, and the heat-melting resin layer 2, the ratio of the total thickness of these layers to the thickness (total thickness) of the laminate constituting the outer packaging material 10 for the separator component is preferably 90% or more, more preferably 95% or more, and even more preferably 98% or more. Furthermore, when the outer packaging material 10 for the separator component of the present invention is a laminate comprising 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 thermoplastic resin layer 2, the ratio of the total thickness of each layer to the thickness (total thickness) of the laminate constituting the outer packaging material 10 for the separator component can be set to, for example, 80% or more, preferably 90% or more, more preferably 95% or more, and even more preferably 98% or more.

[0029] The sealing strength of the outer packaging material 10 for the separator component of the present invention, as measured by the following [Seamlessness Evaluation of Outer Packaging Material], after storage in a humid and hot environment, is 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 preferably 15.0 N / 15 mm or less, for example. As a preferred range, 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 can be listed.

[0030] Furthermore, the sealing strength of the outer packaging material 10 for the separator component of the present invention, as measured by the following [Seamlessness Evaluation of Outer Packaging Material] before storage in a humid and hot environment, is preferably 1.0 N / 15 mm or more, more preferably 1.5 N / 15 mm or more, further preferably 2.0 N / 15 mm or more, 6.0 N / 15 mm or more, and the upper limit is preferably 20.0 N / 15 mm or less or 18.0 N / 15 mm or less. As a preferred range, approximately 1.0 to 20.0 N / 15 mm, approximately 1.5 to 20.0 N / 15 mm, approximately 2.0 to 20.0 N / 15 mm, approximately 1.0 to 20.0 N / 15 mm, approximately 1.0 to 18.0 N / 15 mm, approximately 1.5 to 18.0 N / 15 mm, and approximately 1.5 to 18.0 N / 15 mm are all acceptable.

[0031] [Evaluation of the airtightness of outer packaging materials] The separator components were formed using outer packaging material to a size of TD100mm × MD150mm. Using a PCT apparatus, the outer packaging material was stored for 16 days in a humid and hot environment (temperature 120℃, relative humidity 100%, pressure 0.199MPa). The adhesion strength of the outer packaging material before and after storage was measured. The adhesion strength was measured at the interface between the metal layer and the thermoplastic resin layer of the outer packaging material (the portion where the adhesive layer bonded to the metal layer is located). The specific method for measuring the adhesion strength is as follows: Each separator component was further cut into rectangles of TD15mm × MD100mm using the outer packaging material, serving as the test sample. Next, the metal layer (aluminum alloy foil) of the test sample was partially T-shapedly peeled from the layer bonded to the metal layer via the adhesive layer in the MD direction. The aluminum alloy foil side and the thermoplastic resin layer side were then fixed separately using the clamps of a tensile testing machine with the MD direction as the tensile direction. The adhesion strength was measured at a clamp distance of 50mm and a tensile speed of 100mm / min.

[0032] 2. Each layer of the outer packaging material forming the separating components. [Metal layer 1] In the outer packaging material for the separating components, metal layer 1 is a layer that can provide gas barrier properties against gases such as oxygen and water vapor. Multiple layers of metal layer 1 can be provided.

[0033] Metal layer 1 is a layer composed of metallic materials. Specifically, the metallic materials constituting metal layer 1 can include metals such as aluminum, nickel, stainless steel, titanium steel, iron, and steel, or alloys containing these.

[0034] In metal layer 1, the aforementioned layer composed of metallic materials may include recycled metallic materials. Examples of recycled metallic materials include aluminum alloys, stainless steel, titanium steel, or recycled steel plates. These recycled materials can be obtained using known methods. For example, recycled aluminum alloys can be obtained using the manufacturing method described in International Publication No. 2022 / 092231. Metal layer 1 may consist solely of recycled materials or may consist of a mixture of recycled and virgin materials. Furthermore, recycled metallic materials refer to metallic materials that have been recycled, separated, and refined from various commercially available post-use products and waste generated during manufacturing processes to achieve a reusable state. Additionally, virgin metallic materials refer to newly refined metallic materials derived from natural metallic resources (raw materials), and are not recycled materials.

[0035] As the metal layer 1, examples include barrier metal foils and metal films. The thickness of the metal film is not particularly limited as long as the desired gas barrier properties are achieved, and can be appropriately set depending on the type of metal film. For example, when the metal film is an aluminum film, from the viewpoints of gas barrier properties, adhesion to the resin substrate, and crack resistance, the thickness of the metal film is preferably 10 nm to 250 nm, more preferably 20 nm to 200 nm, and even more preferably 40 nm to 150 nm.

[0036] Metal films are typically configured to be in direct contact with a resin substrate. Alternatively, the metal film can be, for example, a vapor-deposited film or a coated film.

[0037] Furthermore, there are no particular limitations on the resin substrate 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 acid resins; polycarbonate resins; polyvinyl alcohol-based resins such as polyvinyl alcohol (PVA) and ethylene-vinyl alcohol copolymers (EVOH); ethylene-vinyl ester copolymer saponifications; various polyamide resins such as nylon; polyimide resins; polyurethane resins; acetal resins; and cellulose resins.

[0038] The resin substrate can be surface-treated to improve adhesion to the metal film.

[0039] The thickness of the resin substrate is not particularly limited and can be set appropriately. For example, the thickness of the resin substrate can be between 10 μm and 150 μm.

[0040] When the metal layer 1 is a metal foil, it is preferably an aluminum alloy foil, stainless steel foil, etc.

[0041] From the viewpoint of the conformability of the outer packaging material for the separator to the contents, aluminum alloy foil is more preferably a soft aluminum alloy foil made of annealed aluminum alloy, etc. From the viewpoint of even higher conformability to the contents, aluminum alloy foil containing iron is preferred. In the aluminum alloy foil containing iron (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 making the iron content 0.1% by mass or more, an outer packaging material for the separator with better conformability can be obtained. By making the iron content 9.0% by mass or less, an outer packaging material for the separator with better flexibility can be obtained. Examples of soft aluminum alloy foils include those with compositions specified in JIS H4160:1994 A8021H-O, JIS H4160:1994 A8079H-O, JIS H4000:2014 A8021P-O, or JIS H4000:2014 A8079P-O. Additionally, silicon, magnesium, copper, manganese, etc., may be added as needed. Furthermore, softening can be achieved through annealing or similar processes.

[0042] In addition, stainless steel foils can be categorized into austenitic, ferritic, austenitic-ferritic, martensitic, and precipitation-curing types. From the viewpoint of providing a more adaptable outer packaging material for partition components, stainless steel foil made of austenitic stainless steel is preferred.

[0043] Specific examples of stainless steels that constitute the austenitic system of stainless steel foil include SUS304, SUS301, and SUS316L, among which SUS304 is particularly preferred.

[0044] Regarding the thickness of metal layer 1, when it is a metal foil, it is sufficient to function as a metal layer that provides gas barrier properties against gases such as oxygen and water vapor; for example, a thickness of about 6 to 200 μm is acceptable. The thickness of metal layer 1 is preferably about 85 μm or less, more preferably about 50 μm or less, further preferably about 40 μm or less, and particularly preferably about 35 μm or less. Furthermore, the thickness of metal layer 1 is preferably about 9 μm or more, and further preferably about 10 μm or more. Additionally, preferred ranges for the thickness of metal layer 1 include approximately 9 to 85 μm, approximately 9 to 50 μm, approximately 9 to 40 μm, approximately 9 to 35 μm, approximately 10 to 85 μm, approximately 10 to 50 μm, approximately 10 to 40 μm, and approximately 10 to 35 μm. When metal layer 1 is composed of aluminum alloy foil, the above-mentioned ranges are particularly preferred. Furthermore, from the viewpoint of providing high conformability and high rigidity to the outer packaging material 10 for the separating components, the thickness of the metal layer 1 is preferably about 35 μm or more, more preferably about 45 μm or more, further preferably about 50 μm or more, and even more preferably about 55 μm or more. It is also 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. As a preferred range, it is 35 to 20 μm. Approximately 0 μm, 35–85 μm, 35–75 μm, 35–70 μm, 45–200 μm, 45–85 μm, 45–75 μm, 45–70 μm, 50–200 μm, 50–85 μm, 50–75 μm, 50–70 μm, 55–200 μm, 55–85 μm, 55–75 μm, 55–70 μm. By making the outer packaging material 10 for the separator component highly traceable, tracking of the contents becomes easier. Furthermore, by increasing the rigidity of the outer packaging material 10 for the separator component, it is possible to contribute to a high degree of sealing of the contents. Furthermore, especially when the metal layer 1 is composed 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. Additionally, the thickness of the stainless steel foil is preferably about 10 μm or more, more preferably about 15 μm or more. Furthermore, preferred ranges for the thickness of the stainless steel foil include approximately 10–60 μm, approximately 10–50 μm, approximately 10–40 μm, approximately 10–30 μm, approximately 10–25 μm, approximately 15–60 μm, approximately 15–50 μm, approximately 15–40 μm, approximately 15–30 μm, and approximately 15–25 μm.

[0045] [Corrosion-resistant coating] The metal layer 1 has a corrosion-resistant coating on at least the side of the heat-fusion resin layer 2. The corrosion-resistant coating may be present only on the side of the heat-fusion resin layer 2 of the metal layer 1, or it may be present on both sides of the metal layer 1.

[0046] The corrosion-resistant coating refers to a thin film that imparts corrosion resistance (e.g., acid resistance, alkali resistance, etc.) to the metal layer, such as through hot water conversion treatment (e.g., boehm coating), chemical surface treatment, anodizing, nickel or chromium plating, or anti-corrosion treatment by applying a coating agent. 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). One or more treatments can be performed to form the corrosion-resistant coating. Furthermore, multiple layers are possible instead of a single layer. Among these treatments, hot water conversion treatment and anodizing treatment utilize a treatment agent to dissolve the surface of the metal foil and form a metal compound with excellent corrosion resistance. These treatments are sometimes also included in the definition of chemical surface treatment. In this invention, the corrosion-resistant coating is included as the metal layer 1.

[0047] The corrosion-resistant coating exhibits the following effects: it prevents delamination between the metal layer 1 (e.g., aluminum alloy foil) and the layers adjacent to the thermoplastic resin layer 2 (e.g., thermoplastic 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 separating component, especially the dissolution and corrosion of alumina present on the surface of the metal layer when the metal layer is aluminum alloy foil, and improves the adhesion (wetting) of the surface of the metal layer, preventing delamination between the metal layer and the adjacent layers.

[0048] As corrosion-resistant coatings formed by chemical surface treatment, various coatings are known, primarily including corrosion-resistant coatings containing at least one of phosphates, chromates, fluorides, triazine thiols, and rare earth oxides. Examples of chemical surface treatments using phosphates or chromates include chromate-chromate treatment, chromate-phosphate 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 dihydrogen phosphate, chromium acetoacetate chromate, chromium chloride, and potassium chromium sulfate. Examples of phosphorus compounds used in these treatments include sodium phosphate, potassium phosphate, ammonium phosphate, and polyphosphates. Examples of chromate treatments include etched chromate treatment, electrolytic chromate treatment, and coating-type chromate treatment, with coating-type chromate treatment being preferred. The coating-type chromate treatment is performed as follows: First, at least the inner layer of the metal layer (e.g., aluminum alloy foil) is degreased using known methods such as alkaline immersion, electrolytic cleaning, acid cleaning, electrolytic acid cleaning, and oxygen activation. Then, the degreased surface is coated with a treatment solution primarily composed of metal phosphate salts such as Cr (chromium) phosphate, Ti (titanium) phosphate, Zr (zirconium) phosphate, and Zn (zinc) phosphate, or a mixture thereof, using known coating methods such as roller coating, gravure printing, or immersion. Alternatively, a treatment solution primarily composed of non-metallic phosphate salts and mixtures thereof, or a mixture thereof with synthetic resins, can be applied. The surface is then dried. Various solvents can be used, such as water, alcohol-based solvents, hydrocarbon-based solvents, ketone-based solvents, ester-based solvents, and ether-based solvents; water is preferred. In addition, as resin components used at this time, examples include polymers such as phenolic resins and acrylic resins, and examples include chromate treatment of aminophenolic polymers having repeating units shown in the following general formulas (1) to (4). Furthermore, in the aminophenolic polymer, the repeating units shown in the following general formulas (1) to (4) may contain only one type, or may be any combination of two or more types. Acrylic resins are preferably polyacrylic acid, methacrylate copolymers of acrylate, maleic acid copolymers of acrylate, styrene copolymers of acrylate, or derivatives of their sodium, ammonium, or amine salts. In particular, derivatives of polyacrylic acid such as ammonium, sodium, or amine salts of polyacrylic acid are preferred. In this invention, polyacrylic acid refers to polymers of acrylic acid. In addition, acrylic resins are also preferably copolymers of acrylic acid with dicarboxylic acid or dicarboxylic anhydride, and are also preferably ammonium, sodium, or amine salts of copolymers of acrylic acid with dicarboxylic acid or dicarboxylic anhydride. Only one type of acrylic resin may be used, or two or more types may be used in combination. In general formulas (1) to (4), X represents a hydrogen atom, hydroxyl group, alkyl group, hydroxyalkyl group, allyl group, or benzyl group. Additionally, R... 1 and R 2 The same or different respectively indicate hydroxyl, alkyl, or hydroxyalkyl. In general formulas (1) to (4), X and R are used respectively. 1 and R 2 The alkyl groups shown can be, for example, straight-chain or branched alkyl groups with 1 to 4 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, etc. Additionally, as X, R... 1 and R 2 The hydroxyalkyl groups shown, for example, include straight-chain or branched alkyl groups with 1 to 4 carbon atoms substituted by one hydroxyl group, such as hydroxymethyl, 1-hydroxyethyl, 2-hydroxyethyl, 1-hydroxypropyl, 2-hydroxypropyl, 3-hydroxypropyl, 1-hydroxybutyl, 2-hydroxybutyl, 3-hydroxybutyl, 4-hydroxybutyl, etc. In general formulas (1) to (4), X, R 1 and R 2 The alkyl and hydroxyalkyl groups shown may be the same or different. In general formulas (1) to (4), X is preferably a hydrogen atom, a hydroxyl group, or a hydroxyalkyl group. The number-average molecular weight of the aminophenolic polymer having the repeating units shown in general formulas (1) to (4) is preferably about 5 million to 1 million, more preferably about 10 million to 20,000. The aminophenolic polymer can be produced, for example, by polycondensing a phenolic compound or a naphthol compound with formaldehyde to produce a polymer containing the repeating units shown in general formula (1) or general formula (3) above, and then using formaldehyde and an amine (R 1 R 2 NH) will have functional groups (-CH2NR) 1 R 2 The above-obtained polymer is introduced to manufacture the product. Aminated phenolic polymers can be used alone or in combination of two or more.

[0049] Other examples of corrosion-resistant coatings include films formed by coating a coating agent containing at least one of rare earth element oxide sols, anionic polymers, and cationic polymers. The coating agent may also contain phosphoric acid or phosphates, or a crosslinking agent that crosslinks the polymer. In the rare earth element oxide sol, particles of rare earth element oxides (e.g., particles with an average particle size of 100 nm or less) are dispersed in a liquid dispersion medium. Examples of rare earth element oxides include cerium oxide, yttrium oxide, neodymium oxide, and lanthanum oxide; cerium oxide is preferred from the viewpoint of further improving adhesion. The rare earth element oxides contained in the corrosion-resistant coating can be used alone or in combination of two or more. Various solvents can be used as the liquid dispersion medium for the rare earth element oxide sol, such as water, alcohol solvents, hydrocarbon solvents, ketone solvents, ester solvents, and ether solvents; water is preferred. As cationic polymers, preferred examples include polyethyleneimine, ionic polymeric complexes composed of polyethyleneimine and polymers containing carboxylic acids, primary amine-grafted acrylic resins obtained by grafting primary amines onto an acrylic acid backbone, polyallylamine or its derivatives, and aminophenolic compounds. As anionic polymers, preferred examples include poly(meth)acrylic acid or its salts, or copolymers with (meth)acrylic acid or its salts as the main component. Furthermore, the crosslinking agent is preferably at least one selected from compounds having any functional groups of isocyanate groups, glycidyl groups, carboxyl groups, oxazoline groups, and silane coupling agents. Additionally, the aforementioned phosphoric acid or phosphate is preferably condensed phosphoric acid or condensed phosphate.

[0050] As an example of a corrosion-resistant coating, one can cite the formation of a coating by coating a metal layer with a dispersion of metal oxides such as alumina, titanium oxide, cerium oxide, and tin oxide or barium sulfate particles dispersed in phosphoric acid and then baking it at a temperature above 150°C.

[0051] The corrosion-resistant coating can be formed, as needed, into a laminated structure consisting of at least one of a cationic polymer and anionic polymer. Examples of cationic and anionic polymers include those described above.

[0052] Furthermore, the composition of the corrosion-resistant coating can be analyzed, for example, using time-of-flight secondary ion mass analysis. Additionally, as described later, in this invention, the detection of Cr, Zr, etc., in the corrosion-resistant coating can be performed using X-ray photoelectron analysis.

[0053] From the viewpoint of better realizing the effects of the present invention, the corrosion-resistant coating formed on the surface of the metal layer 1 on the side of the thermosetting 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. Regarding the upper limit of the atomic composition ratio of Cr or Zr, for example, it is 20 at% or less, more preferably 15 at% or less, and even more preferably 10 at% or less. Preferred ranges for the atomic composition ratio include approximately 0.1 to 20 at%, approximately 0.1 to 15 at%, approximately 0.1 to 10 at%, approximately 0.3 to 20 at%, approximately 0.3 to 15 at%, approximately 0.3 to 10 at%, approximately 1.0 to 20 at%, approximately 1.0 to 15 at%, and approximately 1.0 to 10 at%. The atomic ratio of Cr or Zr refers to the ratio of Cr or Zr atoms measured by X-ray photoelectron spectrophotometry (XPS) when the total number of C, N, O, F, Al, Si, P, S, Cr, and Zr atoms on the surface of the corrosion-resistant coating is set to 100 at%. In the aforementioned chemical surface treatment, for example, when a treatment solution with Cr (chromium) phosphate or Zr (zirconium) phosphate as the main component is used to form a corrosion-resistant coating, a corrosion-resistant coating with a Cr or Zr content of 0.1 at% or higher can be formed. Regarding the side of metal layer 1 opposite to the side of the heat-fused resin layer 2, when a corrosion-resistant coating is formed, it is preferable that the atomic ratio of Cr or Zr obtained by X-ray photoelectron analysis is one of these atomic ratios. XPS analysis of the corrosion-resistant coating formed on the surface of the metal layer is performed under the following conditions.

[0054] [XPS Analysis of Corrosion-Resistant Coating] The following measurement conditions were used to perform X-ray photoelectron analysis (XPS analysis) on the surface of the corrosion-resistant coating formed on the metal layer to determine the atomic composition ratio (at%) of each element.

[0055] <Measurement Conditions> • Equipment used: Scanning X-ray photoelectron spectrometer • Spectral acquisition conditions Incident X-rays: AlKα (monochromatic X-rays, hν = 1486.6 eV) X-ray output: 50W (15kV·3.3mA) X-ray beam diameter: 200μmφ X-ray scan: 700μm × 200μm (surface XPS analysis) Photoelectron capture angle: 45 degrees Charge neutralization: electron neutralization gun, low-acceleration ion irradiation • Low-velocity electron irradiation conditions: emission current 10μA, bias potential 1.0V • Low-acceleration ion irradiation conditions: ion species Ar+, accelerating voltage 0.11kV, emission current 7mA Regarding the corrosion-resistant coating formed on the surface of metal layer 1, elements detected other than Cr and Zr include, for example, C, N, O, and sometimes F, Al, Si, P, S, etc.

[0056] There are no particular limitations on the amount of corrosion-resistant coating formed on the surface of metal layer 1 during chemical surface treatment. For example, when performing a coating-type chromate treatment, it is desirable that the surface of metal layer 1 has a corrosion-resistant coating of approximately 1 μm. 2 The content of chromic acid compound, calculated in terms of chromium, is for example about 0.5 to 50 mg, preferably about 1.0 to 40 mg; the content of phosphorus compound, calculated in terms of phosphorus, is for example about 0.5 to 50 mg, preferably about 1.0 to 40 mg; and the content of amino-modified phenolic polymer is for example about 1.0 to 200 mg, preferably about 5.0 to 150 mg.

[0057] There are no particular limitations on the thickness of the corrosion-resistant coating. However, considering the cohesive strength of the coating and its adhesion to the metal layer and the thermosetting resin layer, a thickness of 1 nm or more is preferred, more preferably 5 nm or more, and even more preferably 10 nm or more. Furthermore, a thickness of 100 nm or less is preferred, more preferably 50 nm or less, and even more preferably 40 nm or less. Preferred ranges include approximately 1–100 nm, 1–50 nm, 1–40 nm, 5–100 nm, 5–50 nm, 5–40 nm, 10–100 nm, 10–50 nm, and 10–40 nm. Furthermore, the thickness of the corrosion-resistant coating can be determined by observation using a transmission electron microscope (TEM), or by a combination of TEM and energy-dispersive X-ray spectroscopy or electron beam energy loss spectroscopy. Analysis of the composition of the corrosion-resistant coating using time-of-flight secondary ion mass analysis (TICA) can, for example, detect secondary ions composed of free Cr, P, and O (e.g., CrPO2). + CrPO4 - (at least one of the following) peaks.

[0058] Chemical surface treatment can be performed as follows: a solution containing compounds for forming a corrosion-resistant coating is applied to the surface of the metal layer using methods such as bar coating, roller coating, gravure coating, or dipping, followed by heating to a temperature of approximately 70–200°C. Alternatively, the metal layer can be pre-treated with degreasing methods such as alkaline dipping, electrolytic cleaning, acid cleaning, or electrolytic acid cleaning before chemical surface treatment. This degreasing treatment allows for more efficient chemical surface treatment of the metal layer. Furthermore, by using an acid degreasing agent (made by dissolving fluorine-containing compounds in inorganic acids) during the degreasing process, not only can the metal foil be degreased, but a passive metal fluoride can also be formed. In this case, degreasing alone may be sufficient.

[0059] [Thermo-melting resin layer 2] In the outer packaging material for the separator component of the present invention, the heat-melting resin layer 2 corresponds to the innermost layer. The heat-melting resin layer 2 is a layer (sealing layer) in which the heat-melting resin layers 2 are heat-melted together to seal the contents (e.g., cooling material) when the separator component is made using the outer packaging material for the separator component of the present invention. When the contents (e.g., cooling material) of the separator component are encapsulated using the outer packaging material for the separator component, the heat-melting resin layer 2 is in contact with the contents of the separator component and is joined to each other at the ends of the opposing outer packaging materials for the separator components.

[0060] Regarding the resin constituting the heat-melting resin layer 2, there are no particular restrictions as long as it can be heat-melted; however, resins containing a polyolefin backbone, such as polyolefins and acid-modified polyolefins, are preferred. The fact that the resin constituting the heat-melting resin layer 2 contains a polyolefin backbone can be analyzed, for example, by infrared spectroscopy or gas chromatography-mass spectrometry. Furthermore, when analyzing the resin constituting the heat-melting resin layer 2 using infrared spectroscopy, it is preferable to detect peaks originating from maleic anhydride. For example, when measuring maleic anhydride-modified polyolefins using infrared spectroscopy, a peak at a wavenumber of 1760 cm⁻¹ is preferred. -1 Nearby and wave number 1780cm -1 Peaks originating from maleic anhydride were detected nearby. When the heat-fused resin layer 2 is composed of maleic anhydride-modified polyolefin, peaks originating from maleic anhydride were detected by infrared spectroscopy. However, when the degree of acid modification is low, the peaks sometimes become too small to be detected. In such cases, nuclear magnetic resonance spectroscopy can be used for analysis.

[0061] The heat-melting resin layer 2 preferably contains a resin comprising a polyolefin backbone as its main component, more preferably contains a polyolefin as its main component, and even more preferably contains polypropylene as its main component. Here, "main component" refers to a resin component in the heat-melting resin layer 2 that contains, 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. For example, "the heat-melting resin layer 2 contains polypropylene as its main component" means that the polypropylene content in the resin component of the heat-melting resin layer 2 is, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably 99% by mass or more.

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

[0063] Furthermore, the polyolefin can be a cyclic polyolefin. A cyclic polyolefin is a copolymer of an olefin and a cyclic monomer. Examples of olefins that are constituent monomers of the aforementioned cyclic polyolefin include ethylene, propylene, 4-methyl-1-pentene, styrene, butadiene, and isoprene. Examples of cyclic monomers that are constituent monomers of the cyclic polyolefin include cyclic olefins such as norbornene; and cyclic dienes such as cyclopentadiene, dicyclopentadiene, cyclohexadiene, and norbornene. Among these, cyclic olefins are preferred, and norbornene is even more preferred.

[0064] Furthermore, the polyolefin can be an acid-modified polyolefin. An acid-modified polyolefin refers to a polymer obtained by modifying a polyolefin through block polymerization or graft polymerization with an acid component. As the polyolefin to be acid-modified, other options include the aforementioned polyolefins, copolymers obtained by copolymerizing polar molecules such as acrylic acid or methacrylic acid with the aforementioned polyolefins, or polymers of cross-linked polyolefins. Additionally, examples of acid components used for acid modification include carboxylic acids or anhydrides of maleic acid, acrylic acid, itaconic acid, crotonic acid, maleic anhydride, itaconic anhydride, etc.

[0065] Acid-modified polyolefins can be acid-modified cyclic polyolefins. Acid-modified cyclic polyolefins refer to polymers obtained by copolymerizing a portion of the monomers constituting the cyclic polyolefin with an acid component, or by block polymerization or graft polymerization of the acid component into the cyclic polyolefin. The same applies to acid-modified cyclic polyolefins. Furthermore, the acid component used for acid modification is the same as that used for the modification of the polyolefins described above.

[0066] Preferred acid-modified polyolefins include polyolefins modified with carboxylic acids or their anhydrides, polypropylene modified with carboxylic acids or their anhydrides, maleic anhydride-modified polyolefins, and maleic anhydride-modified polypropylene.

[0067] The heat-melting resin layer 2 can be formed from a single resin or from a blended polymer obtained by combining two or more resins. Alternatively, the heat-melting resin layer 2 can be formed from a single layer or from two or more layers of the same or different resins.

[0068] When manufacturing the outer packaging material 10 for the separator component of the present invention by laminating the heat-melting resin layer 2 with the metal layer 1, adhesive layer 3, etc., a pre-formed resin film can be used as the heat-melting resin layer 2. Alternatively, the heat-melting resin that forms the heat-melting resin layer 2 can be film-formed on the surface of the metal layer 1, adhesive layer 3, etc. by extrusion molding, coating, etc., to produce the heat-melting resin layer 2 formed of the resin film.

[0069] The heat-melting resin layer 2 may also contain additives such as anti-blocking agents, lubricants, flame retardants, and fillers.

[0070] The melting point of the heat-melting resin layer 2 also depends 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 where a separator is arranged between multiple heating elements, if any heating element overheats abnormally, heat is released from the heating element, causing the temperature of the separator located near that heating element to rise. At this time, when the temperature of the separator exceeds the melting point of the heat-melting resin layer, the heat-melting resin layer melts, and the encapsulation portion of the separator using the outer packaging material becomes easy to peel off. Furthermore, as the temperature of the separator rises, the temperature of the contents sealed within the separator (e.g., a cooling material including water) also rises, causing the vapor pressure of the contents to rise, resulting in an increase in the internal pressure of the separator. At this time, when the internal pressure of the separator exceeds the weld strength of the heat-melting resin layer at the encapsulation portion of the separator using the outer packaging material, the encapsulation portion of the separator using the outer packaging material becomes easy to peel off. Additionally, as described later, the cooling material preferably includes water. Therefore, when the melting point of the heat-melting resin layer is within the above-mentioned range, in the above-mentioned structure, peeling of the encapsulation portion of the separator using the outer packaging material can be suppressed under normal conditions.

[0071] On the other hand, the melting point of the heat-welding resin layer is preferably below 250°C, more preferably below 200°C, and even more preferably below 170°C. When the melting point of the heat-welding resin layer is within the above range, in the above structure, the encapsulation portion of the outer packaging material for the separator becomes easier to peel off when abnormal heating occurs. By peeling off the encapsulation portion of the outer packaging material for the separator, cooling material is discharged from the separator, and the abnormally heating element can be cooled. As a result, thermal runaway can be suppressed.

[0072] The melting point of the heat-fused resin layer can be determined using a differential scanning calorimeter (DSC) by the following method. First, the heat-fused resin layer is peeled off from the outer packaging material of the separator to obtain a sample of approximately 10 mg. This sample is placed in an aluminum bath, and using a differential scanning calorimeter, the temperature is increased from 20°C to 300°C at a rate of 10°C / min under a nitrogen atmosphere, and held at this temperature for 10 minutes. Then, the temperature is cooled to 20°C at a rate of 10°C / min, held at this temperature for 10 minutes, and then increased again to 300°C at a rate of 10°C / min (second heating). The intersection of the tangent at the melting point observed during the second heating and the baseline of the DSC curve at a lower temperature than the aforementioned melting point is taken as the melting point of the heat-fused resin layer.

[0073] Furthermore, the heat-melt resin layer 2 may contain additives such as lubricants, anti-blocking agents, flame retardants, and fillers, as needed. When the heat-melt resin layer 2 contains a lubricant, the conformability of the outer packaging material for the separating components can be improved. There are no particular restrictions on the lubricant used; known lubricants can be used.

[0074] There are no particular limitations on the lubricant used, but amide-based lubricants are preferred. Specific examples of lubricants include those illustrated in protective layer 6. A single lubricant can be used alone, or in combination of two or more types; combination of two or more types is preferred.

[0075] In this invention, from the viewpoint of improving the conformability of the outer packaging material for the separating components, it is preferable that a lubricant is present on at least one of the surface and interior of the heat-melting resin layer 2. There are no particular limitations on the lubricant, but amide-based lubricants are preferred. Specific examples of amide-based lubricants include saturated fatty acid amides, unsaturated fatty acid amides, substituted amides, hydroxymethylamides, saturated fatty acid diamides, unsaturated fatty acid diamides, fatty acid ester amides, aromatic diamides, etc. Specific examples of saturated fatty acid amides include lauryl amide, palmitamide, stearamide, betaine amide, hydroxystearamide, etc. Specific examples of unsaturated fatty acid amides include oleamide, erucamide, etc. Specific examples of substituted amides include N-oleopalmitoamide, N-stearostearamide, N-stearooleoamide, N-oleostearamide, N-stearoerucamide, etc. Additionally, specific examples of hydroxymethylamides include hydroxymethylstearamide, etc. Specific examples of saturated fatty acid diamides include methylene bis-stearamide, ethylene bis-decanoamide, ethylene bis-lauranamide, ethylene bis-stearamide, ethylene bis-hydroxystearamide, ethylene bis-benzamide, hexamethylene bis-stearamide, hexamethylene bis-benzamide, hexamethylene hydroxystearamide, N,N'-distearate adipamide, and N,N'-distearate sebacamide. Specific examples of unsaturated fatty acid diamides include ethylene dioleamide, ethylene dierucamide, hexamethylene dioleamide, N,N'-dioleoyl adipamide, and N,N'-dioleoyl sebacamide. Specific examples of fatty acid ester amides include stearamide ethyl stearate. In addition, specific examples of aromatic diamides include isophthalimide distearate, isophthalimide dihydroxystearamide, and N,N'-distearate isophthalamide. A lubricant can be used alone or in combination of two or more, preferably in combination of two or more.

[0076] When a lubricant is present on the surface of the heat-fusion resin layer 2, there is no particular limitation on its amount; however, from the viewpoint of improving the conformity of the outer packaging material for the separating components, approximately 1 mg / m³ is preferred. 2 The above, or more preferably about 3 mg / m³ 2 The above, and more preferably about 5 mg / m² 2 The above, and more preferably, is about 10 mg / m³ 2 The above, and more preferably, is about 15 mg / m³2 In addition, approximately 50 mg / m² is preferred. 2 The following, and more preferably, is about 40 mg / m². 2 The following are examples of preferred ranges: 1–50 mg / m² 2 Approximately 1-40 mg / m² 2 Approximately 3-50 mg / m² 2 Approximately 3-40 mg / m² 2 Approximately 5-50 mg / m² 2 Approximately 5-40 mg / m² 2 Approximately 10-50 mg / m² 2 Approximately 10-40 mg / m² 2 Approximately 15-50 mg / m² 2 Approximately 15-40 mg / m² 2 about.

[0077] When a lubricant is present inside the heat-melting resin layer 2, there is no particular limitation on its amount. From the viewpoint of improving the conformity of the outer packaging material for the separating component, it is preferably about 100 ppm or more, more preferably about 300 ppm or more, and even more preferably about 500 ppm or more. In addition, it is preferably about 3000 ppm or less, more preferably about 2000 ppm or less. As a preferred range, examples 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 lubricants are present inside the heat-melting resin layer 2, the above-mentioned lubricant dosage is the total lubricant dosage. Furthermore, when two or more lubricants are present inside the heat-fusion resin layer 2, the amount of the first lubricant is not particularly limited. From the viewpoint of improving the conformity of the outer packaging material for the separator, it is preferably about 100 ppm or more, more preferably about 300 ppm or more, and even more preferably about 500 ppm or more. In addition, it is preferably about 3000 ppm or less, more preferably about 2000 ppm or less. As a preferred range, it can be listed as 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. There is no particular limitation on the amount of the second type of lubricant. From the viewpoint of improving the conformity of the outer packaging material for the separator, it is preferably about 50 ppm or more, more preferably about 100 ppm or more, and even more preferably about 200 ppm or more. In addition, it is preferably about 1500 ppm or less, more preferably about 1000 ppm or less. As a preferred range, examples include about 50 to 1500 ppm, about 50 to 1000 ppm, about 100 to 1500 ppm, about 100 to 1000 ppm, about 200 to 1500 ppm, and about 200 to 1000 ppm.

[0078] The lubricant present on the surface of the heat-fusion resin layer 2 can be a lubricant that seeps out from the lubricant contained in the resin constituting the heat-fusion resin layer 2, or it can be a lubricant coated on the surface of the heat-fusion resin layer 2.

[0079] Furthermore, the thickness of the heat-fusion resin layer 2 is not particularly limited as long as the heat-fusion resin layers are heat-fused together to perform the function of encapsulating the contents. For example, it can be about 100 μm or less, preferably about 85 μm or less, and more preferably about 15 to 85 μm. In addition, for example, when the thickness of the adhesive layer 5 described later is 10 μm or more, the thickness of the heat-fusion resin layer 2 is preferably about 85 μm or less, and more preferably about 15 to 45 μm. For example, when the thickness of the adhesive layer 5 described later is less than 10 μm or when the adhesive layer 5 is not provided, the thickness of the heat-fusion resin layer 2 is preferably about 20 μm or more, and more preferably about 35 to 85 μm.

[0080] [Adhesive layer 3] For example, Figures 2 to 5 As shown, the outer packaging material 10 for the separator component of the present invention may, as needed, have an adhesive layer 3 between the metal layer 1 and the thermoplastic resin layer 2. The adhesive layer 3 is in contact with the metal layer 1 from the inside, and improves the adhesion between the layers (thermoplastic resin layer 2, resin layer 4, etc.) further inside the metal layer 1 and the metal layer 1. When a resin layer 4 (described later) is present between the metal layer 1 and the thermoplastic resin layer 2, the adhesive layer 3 is disposed between the metal layer 1 and the resin layer 4, bonding these layers together.

[0081] The adhesive layer 3 is formed of an adhesive capable of bonding the metal layer 1 to its adjacent layers. The adhesive used to form the adhesive layer 3 is not limited and can be any type, such as chemically reactive, solvent-volatile, heat-melting, or hot-pressing adhesive. Furthermore, it can be a two-component curing adhesive, a one-component curing adhesive, or a resin that does not undergo a curing reaction. Additionally, the adhesive layer 3 can be a single layer or multiple layers.

[0082] Specifically, adhesive components included in adhesives can include polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, and copolyesters; polyethers; polyurethanes; epoxy resins; phenolic resins; polyamides such as nylon 6, nylon 66, nylon 12, and copolyamides; polyolefin 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 can be used individually or in combination of two or more. Among these adhesive components, polyolefin adhesives and polyurethane adhesives are preferred, with polyolefin adhesives being particularly preferred. Furthermore, the resins that constitute these adhesive components can have their bond strength improved by using a suitable curing agent. The curing agent is selected from suitable compounds such as polyisocyanates, polyfunctional epoxy resins, oxazoline-containing polymers, polyamine resins, and acid anhydrides, based on the functional groups possessed by the adhesive components.

[0083] In this invention, from the viewpoint of further strengthening the bond between the metal layer 1 and the layers adjacent thereto (e.g., improving adhesion in humid and hot environments), the resin used to form the adhesive layer 3 preferably contains a polyolefin backbone. That is, the adhesive layer 3 is particularly preferably formed from a polyolefin-based adhesive.

[0084] In the adhesive layer 3, the resin containing the polyolefin backbone can include polyolefins, acid-modified polyolefins, cyclic polyolefins, and acid-modified cyclic polyolefins as exemplified in the aforementioned heat-melting resin layer 2. On the other hand, from the viewpoint of firmly bonding the metal layer 1 to the layers adjacent to it, the adhesive layer 3 preferably contains an acid-modified polyolefin. As acid-modifying components, dicarboxylic acids such as maleic acid, itaconic acid, succinic acid, and adipic acid, as well as their anhydrides, acrylic acid, and methacrylic acid, can be included. From the perspective of ease of modification and versatility, maleic anhydride is most preferred. Furthermore, from the viewpoint of the heat resistance of the outer packaging material for the separating components, the olefin component is preferably a polypropylene-based resin, and the adhesive layer 3 most preferably contains maleic anhydride-modified polypropylene.

[0085] When the resin used to form the adhesive layer 3 contains a polyolefin backbone, the adhesive layer 3 preferably contains a resin containing a polyolefin backbone as a main component, more preferably contains an acid-modified polyolefin as a main component, and even more preferably contains an acid-modified polypropylene as a main component. Here, "main component" refers to a resin component in the adhesive layer 3 that contains, 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. For example, "the adhesive layer 3 contains acid-modified polypropylene as a main component" means that the acid-modified polypropylene content in the resin component of the adhesive layer 3 is, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably 99% by mass or more.

[0086] The fact that the resin constituting adhesive layer 3 contains a polyolefin backbone can be analyzed, for example, by infrared spectroscopy, gas chromatography-mass spectrometry, or other analytical methods, and the analytical method is not limited. Furthermore, the resin constituting adhesive layer 3 contains acid-modified polyolefins; for example, when maleic anhydride-modified polyolefins are determined by infrared spectroscopy at a wavenumber of 1760 cm⁻¹. -1 Nearby and wave number 1780cm -1 Peaks originating from maleic anhydride were detected nearby. However, when the acid modification degree is low, the peaks sometimes become too small to be detected. In such cases, nuclear magnetic resonance spectroscopy can be used for analysis.

[0087] Furthermore, from the viewpoints of heat resistance, durability, and resistance to contents of the outer packaging material used for separating components, as well as reducing thickness and ensuring conformability, the adhesive layer 3 is more preferably a cured product containing a resin composition of an acid-modified polyolefin and a curing agent. The aforementioned substance is preferably used as the acid-modified polyolefin.

[0088] The adhesive layer 3 is preferably a cured product containing an acid-modified polyolefin and a resin composition selected from at least one of compounds having isocyanate groups, compounds having oxazoline groups, and compounds having epoxy groups. It is particularly preferred to be a cured product containing an acid-modified polyolefin and a resin composition selected from at least one of compounds having isocyanate groups and compounds having epoxy groups. Furthermore, the adhesive layer 3 preferably contains at least one of polyurethane, polyester, and epoxy resin, more preferably polyurethane and epoxy resin. As a polyester, for example, an ester resin generated by the reaction of epoxy groups and maleic anhydride groups, or an amide ester resin generated by the reaction of oxazoline groups and maleic anhydride groups, is preferred. In addition, when unreacted curing agents such as compounds having isocyanate groups, compounds having oxazoline groups, and epoxy resins remain in the adhesive layer 3, the presence of unreacted substances can be confirmed, for example, by methods selected from infrared spectroscopy, Raman spectroscopy, and time-of-flight secondary ion mass analysis (TOF-SIMS).

[0089] Furthermore, from the viewpoint of further improving the adhesion between the metal layer 1 and the adhesive layer 3, the adhesive layer 3 is preferably a cured product containing a resin composition having at least one curing agent selected from oxygen atoms, heterocyclic rings, C=N bonds, and C-O-C bonds. Examples of curing agents having heterocyclic rings include curing agents having oxazoline groups and curing agents having epoxy groups. Examples of curing agents having C=N bonds include curing agents having oxazoline groups and curing agents having isocyanate groups. Examples of curing agents having C-O-C bonds include curing agents having oxazoline groups and curing agents having epoxy groups. The fact that the adhesive layer 3 is a cured product containing a resin composition of these curing agents can be confirmed, for example, by methods such as gas chromatography-mass spectrometry (GCMS), infrared spectroscopy (IR), time-of-flight secondary ion mass spectrometry (TOF-SIMS), and X-ray photoelectron spectroscopy (XPS).

[0090] There are no particular limitations on the compounds containing isocyanate groups, but from the viewpoint of effectively improving the adhesion between the metal layer 1 and the adhesive layer 3, polyfunctional isocyanate compounds are preferred. There are no particular limitations on polyfunctional isocyanate compounds as long as they have two or more isocyanate groups. Specific examples of polyfunctional isocyanate-based curing agents include pentane diisocyanate (PDI), isoflurane diisocyanate (IPDI), hexamethylene diisocyanate (HDI), toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), products obtained by polymerizing or ureating these compounds, mixtures thereof, or copolymers with other polymers. Additionally, adducts, biuret bodies, and isocyanurates can be included.

[0091] The content of the isocyanate-containing compound in the adhesive layer 3 is preferably in the range of 0.1% to 50% by mass in the resin composition constituting the adhesive layer 3, and more preferably in the range of 0.5% to 40% by mass. This effectively improves the adhesion between the metal layer 1 and the adhesive layer 3.

[0092] Compounds containing an oxazoline group are not particularly limited to any compound having an oxazoline backbone. Specific examples of compounds containing an oxazoline group include compounds with a polystyrene backbone and compounds with an acrylic acid backbone. Furthermore, commercially available products include, for example, the EPOCROS series manufactured by Nippon Shokubai Co., Ltd.

[0093] The proportion of the oxazoline-containing compound in the adhesive layer 3 is preferably in the range of 0.1% to 50% by mass, more preferably in the range of 0.5% to 40% by mass. This effectively improves the adhesion between the metal layer 1 and the adhesive layer 3.

[0094] Epoxy resins are an example of compounds containing epoxy groups. There are no particular limitations on the epoxy resin, as long as it is a resin capable of forming a cross-linked structure through epoxy groups present in the molecule; known epoxy resins can be used. The weight-average molecular weight of the epoxy resin is preferably around 50 to 2000, more preferably around 100 to 1000, and even more preferably around 200 to 800. Furthermore, in this invention, 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.

[0095] Specific examples of epoxy resins include glycidyl ether derivatives of trimethylolpropane, bisphenol A diglycidyl ether, modified bisphenol A diglycidyl ether, bisphenol F type glycidyl ether, phenolic varnish glycidyl ether, glycerol polyglycidyl ether, and polyglycerol polyglycidyl ether. Epoxy resins can be used alone or in combination of two or more.

[0096] The proportion of epoxy resin in the adhesive layer 3 is preferably in the range of 0.1% to 50% by mass, and more preferably in the range of 0.5% to 40% by mass. This effectively improves the adhesion between the metal layer 1 and the adhesive layer 3.

[0097] There are no particular restrictions on the type of polyurethane used; any known polyurethane can be used. For example, the adhesive layer 3 can be a cured product of a two-component curing polyurethane.

[0098] The proportion of polyurethane in the adhesive layer 3 is preferably in the range of 0.1% to 50% by mass in the resin composition constituting the adhesive layer 3, and more preferably in the range of 0.5% to 40% by mass. This effectively improves the adhesion between the metal layer 1 and the adhesive layer 3 in an atmosphere containing components that induce corrosion of the metal layer, such as electrolytes.

[0099] Furthermore, when the adhesive layer 3 is a cured composition comprising at least one of a compound having an isocyanate group, a compound having an oxazoline group, and an epoxy resin, as well as the aforementioned 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 function as curing agents, respectively.

[0100] The adhesive layer 3 may contain a modifier with carbodiimide groups.

[0101] When manufacturing the outer packaging material 10 for the partition component of the present invention by laminating the adhesive layer 3 with the metal layer 1, the thermoplastic resin layer 2, etc., a pre-formed resin film can be used as the adhesive layer 3. Alternatively, the thermoplastic resin that forms the adhesive layer 3 can be formed into a film on the surface of the metal layer 1, the thermoplastic resin layer 2, etc. by extrusion molding, coating, etc., to form the adhesive layer 3 formed by the resin film.

[0102] As described above, polyurethane adhesives or the like can be used in the formation of adhesive layer 3. Specifically, as mentioned above, from the viewpoint of further strengthening the bond between metal layer 1 and the layers adjacent to it (e.g., improving adhesion in humid and hot environments), the resin used in the formation of adhesive layer 3 preferably contains a polyolefin backbone.

[0103] As a polyurethane adhesive, examples include polyurethane adhesives comprising a first agent containing a polyol compound and a second agent containing an isocyanate compound. Preferably, a two-component curing polyurethane adhesive is used, comprising a polyol such as a polyester polyol, polyether polyol, or acrylic polyol as the first agent and an aromatic or aliphatic polyisocyanate as the second agent. Alternatively, as a polyurethane adhesive, examples include a polyurethane compound obtained by pre-reacting a polyol compound with an isocyanate compound, and an isocyanate compound. Another example is a polyurethane adhesive comprising a polyurethane compound obtained by pre-reacting a polyol compound with an isocyanate compound, and a polyol compound. Furthermore, as a polyurethane adhesive, examples include polyurethane adhesives obtained by reacting a polyurethane compound with moisture in the air and then curing it, wherein the polyurethane compound is obtained by pre-reacting a polyol compound with an isocyanate compound. As the polyol compound, a polyester polyol having hydroxyl groups in its side chains in addition to the terminal hydroxyl groups of the repeating units is preferred. As a second agent, aliphatic, alicyclic, aromatic, and aromatic-aliphatic isocyanate compounds can be listed. Examples of isocyanate compounds include hexamethylene diisocyanate (HDI), phenylenediamine diisocyanate (XDI), isoflurone diisocyanate (IPDI), hydrogenated XDI (H6XDI), hydrogenated MDI (H12MDI), toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), and naphthalene diisocyanate (NDI). Furthermore, one or more polyfunctional isocyanate modifiers derived from these diisocyanates can be listed. Additionally, polymers (e.g., trimers) can also be used as polyisocyanate compounds. Examples of such polymers include adducts, biuret esters, and ureate esters.

[0104] In addition, the adhesive layer 3 may allow the addition of other components without compromising adhesion, such as colorants, thermoplastic elastomers, tackifiers, and fillers.

[0105] The thickness of the adhesive layer 3 is not particularly limited as long as it is sufficient to bond the metal layer 1 to the adjacent layer; for example, it can be about 1 μm or more, or about 2 μm or more. Alternatively, the thickness of the adhesive layer 3 can be, for example, about 10 μm or less, or about 5 μm or less. Furthermore, preferred ranges for the thickness of the adhesive layer 3 include approximately 1–10 μm, approximately 1–5 μm, approximately 2–10 μm, and approximately 2–5 μm.

[0106] [Resin layer 4] In this invention, for example, Figures 3-5As shown, the outer packaging material 10 for the separating component may, as needed, have a resin layer 4 between the metal layer 1 and the thermoplastic resin layer 2. When the resin layer 4 is between the metal layer 1 and the thermoplastic resin layer 2, the metal layer 1 and the resin layer 4 can be directly laminated, or an adhesive layer 3 can be provided between the metal layer 1 and the resin layer 4. Alternatively, the resin layer 4 can be directly laminated to the thermoplastic resin layer 2, or an adhesive layer 5 can be provided between the resin layer 4 and the thermoplastic resin layer 2.

[0107] When a resin layer 4 is present between the metal layer 1 and the thermosetting resin layer 2, the penetration of water or the like into the metal layer 1 from the contents can be suppressed. Therefore, when the outer packaging material for the separator is used for the separator, the expansion of the separator can be further suppressed. In the outer packaging material for the separator of the present invention, since the surface of the metal layer 1 on the side of the thermosetting resin layer 2 has a corrosion-resistant coating, corrosion of the metal layer 1 by water or the like is suppressed, and the resin layer 4 can be provided as needed.

[0108] There are no particular limitations on the resin used to form resin layer 4. For example, the resin used to form the aforementioned resin substrate or the resin used to form the protective layer described later can be used.

[0109] The thickness of the resin layer 4 is not particularly limited as long as the effect of the present invention is achieved. For example, it is about 6 μm or more, preferably about 10 μm or more, more preferably about 12 μm or more. In addition, it is about 200 μm or less, preferably about 50 μm or less, more preferably about 35 μm or less. As a preferred range, examples 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.

[0110] [Adhesive layer 5] The adhesive layer 5 is a layer provided as needed to bond the resin layer 4 and the hot-melt resin layer 2 when the outer packaging material 10 for the separator of the present invention has a resin layer 4 between the metal layer 1 and the hot-melt resin layer 2.

[0111] The adhesive layer 5 may be formed of an adhesive capable of bonding the resin layer 4 to the heat-melting resin layer 2. The adhesive used in forming the adhesive layer 5 is not limited, and the same adhesive as that exemplified in the adhesive layer 3 may be used.

[0112] The adhesive component contained in the adhesive forming adhesive layer 5 can be the same as that in adhesive layer 3, and preferably includes polyolefin adhesives, polyurethane adhesives, etc. For adhesive layer 5, from the viewpoint of further strengthening the bond between resin layer 4 and heat-melting resin layer 2 (e.g., improving adhesion in humid and hot environments), it is preferable that the resin used in forming adhesive layer 5 contains a polyolefin backbone. Adhesive layer 5 is also preferably formed with the same adhesive as adhesive layer 3.

[0113] In addition, as with adhesive layer 3, the addition of other components is permitted for adhesive layer 5, as long as it does not impair adhesion. It may contain colorants, thermoplastic elastomers, tackifiers, fillers, etc.

[0114] The thickness of the adhesive layer 5 is not particularly limited as long as it is sufficient to bond the resin layer 4 and the thermoplastic resin layer 2; for example, it can be about 1 μm or more, or about 2 μm or more. Alternatively, the thickness of the adhesive layer 5 can be, for example, about 10 μm or less, or about 5 μm or less. Furthermore, preferred ranges for the thickness of the adhesive layer 5 include approximately 1–10 μm, approximately 1–5 μm, approximately 2–10 μm, and approximately 2–5 μm.

[0115] [Protective Layer 6] The protective layer 6 is a layer provided as needed on the outer side of the outer packaging material 10 for the separator component of the present invention, which is located further outward than the metal layer 1 (opposite to the side of the heat-melting resin layer 2).

[0116] There are no particular restrictions on the raw materials used to form the protective layer 6, as long as they function as a protective layer, that is, at least protect the outer side of the outer packaging material 10 for the partition components. The protective layer 6 can be formed using resin, for example, and the resin may also contain additives described later.

[0117] When the protective layer 6 is formed of resin, it can be formed, for example, from a resin film. When the protective layer 6 is formed from a resin film, the pre-formed resin film can be used as the protective layer 6 when manufacturing the outer packaging material 10 for the separator component of the present invention by laminating the protective layer 6 with the metal layer 1, etc. Alternatively, the resin used to form the protective layer 6 can be deposited on the surface of the metal layer 1, etc., by extrusion molding, coating, etc., to produce the protective layer 6 formed from a resin film. The resin film can be an unstretched film or a stretched film. Examples of stretched films include uniaxial stretched films and biaxial stretched films, with biaxial stretched films being preferred. Examples of stretching methods for forming biaxial stretched films include sequential biaxial stretching, blow molding, and simultaneous biaxial stretching. Examples of resin coating methods include roller coating, gravure coating, and extrusion coating.

[0118] Examples of resins forming the protective layer 6 include polyester, polyamide, polyolefin, epoxy resin, acrylic resin, fluoropolymer, polyurethane, silicone resin, phenolic resin, and modified versions of these resins. Alternatively, the resin forming the protective layer 6 can be a copolymer of these resins or a modified version of the copolymer. A mixture of these resins may also be used.

[0119] The protective layer 6 preferably contains these resins as main components, and more preferably contains polyester or polyamide as main components. Here, "main component" refers to the resin component contained in the protective layer 6, having a content of, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, further preferably 80% by mass or more, further preferably 90% by mass or more, further preferably 95% by mass or more, further preferably 98% by mass or more, and further preferably 99% by mass or more. For example, "the protective layer 6 contains polyester or polyamide as main components" means that the content of polyester or polyamide in 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, further preferably 80% by mass or more, further preferably 90% by mass or more, further preferably 95% by mass or more, further preferably 98% by mass or more, and further preferably 99% by mass or more.

[0120] Among the resins that form the protective layer 6, polyester and polyamide are preferred examples.

[0121] Specifically, examples of polyesters include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene isophthalate, and copolyesters. Furthermore, examples of copolyesters include copolyesters whose main body is composed of polyethylene terephthalate as a repeating unit. Specifically, examples include copolyesters polymerized with polyethylene isophthalate as the main repeating unit (hereinafter, abbreviated as poly(terephthalic acid / isophthalic acid) glycol ester), poly(terephthalic acid / adipic acid) glycol ester, poly(terephthalic acid / sodium sulfonate) glycol ester, poly(terephthalic acid / sodium isophthalate) glycol ester, poly(terephthalic acid / phenyl-dicarboxylic acid) glycol ester, and poly(terephthalic acid / decanedicarboxylic acid) glycol ester. These polyesters can be used alone or in combination of two or more.

[0122] In addition, as polyamides, specifically, examples include aliphatic polyamides such as nylon 6, nylon 66, nylon 610, nylon 12, nylon 46, and copolymers of nylon 6 and nylon 66; and hexamethylenediamine-isophthalic acid-terephthalic acid copolyamides, etc., containing structural units derived from terephthalic acid and / or isophthalic acid, such as nylon 6I, nylon 6T, nylon 6IT, nylon 6I6T (I represents isophthalic acid, T represents terephthalic acid). Polyamides containing aromatic compounds, such as MXD6 (poly(m-phenylene adipamide)); alicyclic polyamides, such as PACM6 (poly(4-aminocyclohexyl)methanehexamethylenediamide); polyamides further copolymerized with lactam components, isocyanate components such as 4,4'-diphenylmethane-diisocyanate; copolymers of copolymerized polyamides with polyesters and polyalkylene ether glycols, i.e., polyesteramide copolymers, polyether esteramide copolymers; and polyamides of these copolymers. These polyamides can be used alone or in combination of two or more.

[0123] The protective layer 6 preferably comprises at least one of polyester film, polyamide film and polyolefin film, more preferably at least one of stretched polyester film, stretched polyamide film and stretched polyolefin film, further preferably at least one of stretched polyethylene terephthalate film, stretched polybutylene terephthalate film, stretched nylon film and stretched polypropylene film, and even more preferably at least one of biaxially stretched polyethylene terephthalate film, biaxially stretched polybutylene terephthalate film, biaxially stretched nylon film and biaxially stretched polypropylene film.

[0124] The protective layer 6 can be a single layer or composed of two or more layers. When the protective layer 6 is composed of two or more layers, it can be a laminate obtained by laminating a resin film with an adhesive or the like, or it can be a laminate formed by co-extruding resin to form a resin film of two or more layers. In addition, a laminate formed by co-extruding resin to form a resin film of two or more layers can be used directly as the protective layer 6 without stretching, or it can be used as the protective layer 6 by uniaxial stretching or biaxial stretching.

[0125] In the protective layer 6, specific examples of a laminate of two or more resin films can include a laminate of polyester film and nylon film, a laminate of two or more nylon films, and a laminate of two or more polyester films. Preferably, it is a laminate of stretched nylon film and stretched polyester film, a laminate of two or more stretched nylon films, or a laminate of two or more stretched polyester films. For example, when the protective layer 6 is a laminate of two resin films, it is preferably a laminate of polyester resin film and polyester resin film, a laminate of polyamide resin film and polyamide resin film, or a laminate of polyester resin film and polyamide resin film. More preferably, it is a laminate of polyethylene terephthalate film and polyethylene terephthalate film, a laminate of nylon film and nylon film, or a laminate of polyethylene terephthalate film and nylon film. Furthermore, since polyester resin is less prone to discoloration when the electrolyte adheres to the surface, when the protective layer 6 is a laminate of two or more resin films, it is preferable that the polyester resin film is located as the outermost layer of the protective layer 6. In the laminate of polyester resin film and polyamide resin film, preferred ranges for the thickness of the polyester resin film include approximately 2–33 μm, approximately 2–28 μm, approximately 2–23 μm, approximately 2–18 μm, approximately 2–11 μm, approximately 2–8 μm, approximately 10–33 μm, approximately 10–28 μm, approximately 10–23 μm, approximately 10–18 μm, approximately 10–11 μm, approximately 18–33 μm, approximately 18–28 μm, and so on. The thickness is approximately 23 μm. In addition, the preferred ranges for the thickness of polyamide resin film include approximately 2–33 μm, approximately 2–28 μm, approximately 2–23 μm, approximately 2–18 μm, approximately 2–11 μm, approximately 2–8 μm, approximately 10–33 μm, approximately 10–28 μm, approximately 10–23 μm, approximately 10–18 μm, approximately 10–11 μm, approximately 18–33 μm, approximately 18–28 μm, and approximately 18–23 μm.

[0126] When the protective layer 6 is a laminate of two or more resin films, the two or more resin films can be laminated using an adhesive. Preferred adhesives include those similar to those exemplified in adhesive layer 3. Furthermore, there are no particular limitations on the method for laminating the two or more resin films; known methods can be used, such as dry lamination, sandwich lamination, extrusion lamination, and hot lamination, with dry lamination being preferred. When using dry lamination, a polyurethane adhesive is preferably used as the adhesive. The thickness of the adhesive is, for example, approximately 2 to 5 μm. Additionally, an tackifying coating can be formed on the resin films for lamination. The tackifying coating can be made using the same adhesive as exemplified in adhesive layer 3. The thickness of the tackifying coating is, for example, approximately 0.01 to 1.0 μm.

[0127] In addition, additives such as lubricants, flame retardants, anti-blocking agents, antioxidants, light stabilizers, tackifiers, and antistatic agents may be present on at least one of the surfaces and interiors of the protective layer 6. Only one type of additive may be used, or two or more additives may be used in combination.

[0128] In this invention, from the viewpoint of improving the conformability of the outer packaging material for the separating components, it is preferable that a lubricant is present on at least one of the surface and interior of the protective layer 6. There are no particular limitations on the lubricant, but amide-based lubricants are preferred. Specific examples of amide-based lubricants include saturated fatty acid amides, unsaturated fatty acid amides, substituted amides, hydroxymethylamides, saturated fatty acid diamides, unsaturated fatty acid diamides, fatty acid ester amides, aromatic diamides, etc. Specific examples of saturated fatty acid amides include lauryl amide, palmitamide, stearamide, betaine amide, hydroxystearamide, etc. Specific examples of unsaturated fatty acid amides include oleamide, erucamide, etc. Specific examples of substituted amides include N-oleopalmitoamide, N-stearostearamide, N-stearooleoamide, N-oleostearamide, N-stearoerucamide, etc. Additionally, specific examples of hydroxymethylamides include hydroxymethylstearamide, etc. Specific examples of saturated fatty acid diamides include methylene bis-stearamide, ethylene bis-decanoamide, ethylene bis-lauranamide, ethylene bis-stearamide, ethylene bis-hydroxystearamide, ethylene bis-benzamide, hexamethylene bis-stearamide, hexamethylene bis-benzamide, hexamethylene hydroxystearamide, N,N'-distearate adipamide, and N,N'-distearate sebacamide. Specific examples of unsaturated fatty acid diamides include ethylene dioleamide, ethylene dierucamide, hexamethylene dioleamide, N,N'-dioleoyl adipamide, and N,N'-dioleoyl sebacamide. Specific examples of fatty acid ester amides include stearamide ethyl stearate. In addition, specific examples of aromatic diamides include isophthalimide distearate, isophthalimide dihydroxystearamide, and N,N'-distearate isophthalamide. A lubricant can be used alone or in combination of two or more, preferably in combination of two or more.

[0129] When a lubricant is present on the surface of protective layer 6, there is no particular limitation on its amount; for example, approximately 3 mg / m³ can be cited. 2 The above, preferably, examples are approximately 4 mg / m². 2 Above, approximately 5 mg / m 2 That's all. Additionally, the amount of lubricant present on the surface of protective layer 6 can be, for example, approximately 15 mg / m³. 2 The following are preferred examples of approximately 14 mg / m² 2Below, approximately 10 mg / m 2 The following is an example. Furthermore, a preferred range for the amount of lubricant present on the surface of the protective layer 6 is 3 to 15 mg / m³. 2 Approximately 3-14 mg / m² 2 Approximately 3-10 mg / m² 2 Approximately 4-15 mg / m² 2 Approximately 4-14 mg / m² 2 Approximately 4-10 mg / m² 2 Approximately 5-15 mg / m² 2 Approximately 5-14 mg / m² 2 Approximately 5-10 mg / m² 2 about.

[0130] The lubricant present on the surface of the protective layer 6 may be a lubricant that has seeped out from the resin constituting the protective layer 6, or it may be a lubricant that has been coated on the surface of the protective layer 6.

[0131] Regarding the thickness of the protective layer 6, there are no particular limitations as long as it functions as a protective layer. For example, a thickness of about 3 μm or more is acceptable, and about 10 μm or more is preferred. Furthermore, the thickness of the protective layer 6 can be, for example, about 50 μm or less, and preferably about 35 μm or less, about 25 μm or less, or about 20 μm or less. Additionally, preferred ranges for the thickness of the protective layer 6 include approximately 3–50 μm, approximately 3–35 μm, approximately 3–25 μm, approximately 3–20 μm, approximately 10–50 μm, approximately 10–35 μm, approximately 10–25 μm, and approximately 10–20 μm. Particularly when making the separator a lightweight thin film, approximately 3–35 μm, approximately 3–25 μm, and approximately 3–20 μm are preferred. When the protective layer 6 is a laminate of two or more resin films, there is no particular limitation on the thickness of the resin film constituting each layer, and examples include approximately 2 μm or more, preferably approximately 10 μm or more, and approximately 12 μm or more. Furthermore, examples of the thickness of the resin film constituting each layer include approximately 33 μm or less, preferably approximately 28 μm or less, approximately 23 μm or less, approximately 18 μm or less, approximately 11 μm or less, and approximately 8 μm or less. In addition, preferred ranges for the thickness of the resin film constituting each layer include approximately 2–33 μm, approximately 2–28 μm, approximately 2–23 μm, approximately 2–18 μm, approximately 2–11 μm, approximately 2–8 μm, approximately 10–33 μm, approximately 10–28 μm, approximately 10–23 μm, approximately 10–18 μm, approximately 10–11 μm, approximately 12–33 μm, approximately 12–28 μm, approximately 12–23 μm, and approximately 12–18 μm.

[0132] [Adhesive layer 7] The adhesive layer 7 is a layer provided as needed to bond the protective layer 6 to the metal layer 1 when the outer packaging material 10 of the separator component of the present invention has a protective layer 6 on the outside of the metal layer 1.

[0133] The adhesive layer 7 is formed of an adhesive capable of bonding the protective layer 6 to the metal layer 1. The adhesive used in forming the adhesive layer 7 is not limited, and the same adhesive as that exemplified in the adhesive layer 3 can be shown.

[0134] The adhesive component contained in the adhesive forming adhesive layer 7 can be the same as that in adhesive layer 3, preferably including polyolefin adhesives, polyurethane adhesives, etc. Regarding adhesive layer 7, from the viewpoint of further strengthening the bond between protective layer 6 and metal layer 1 (e.g., improving adhesion in humid and hot environments), the resin used in forming adhesive layer 7 preferably also contains a polyolefin backbone. Adhesive layer 7 is also preferably formed from the same adhesive as adhesive layer 3.

[0135] Furthermore, regarding adhesive layer 7, similarly to adhesive layers 3 and 5, the addition of other components is permissible as long as it does not impair adhesion. It may contain colorants, thermoplastic elastomers, tackifiers, fillers, etc. By including a colorant in adhesive layer 7, the outer side of the outer packaging material for the separating components can be colored. Known colorants such as pigments and dyes can be used as colorants. Additionally, only one type of colorant can be used, or two or more can be mixed.

[0136] There are no particular limitations on the type of pigment, as long as it does not impair the adhesiveness of the adhesive layer 7. Examples of organic pigments include azo, phthalocyanine, quinacridone, anthraquinone, dioxazine, indigo thiocyanate, perylene ketone-perylene, isoindolenine, and benzimidazolone pigments. Examples of inorganic pigments include carbon black, titanium dioxide, cadmium, lead, chromium oxide, and iron pigments. In addition, mica powder and fish scale foil can also be included.

[0137] Among colorants, carbon black is preferred, for example, for making the appearance of the outer packaging material of the separating parts black.

[0138] There are no particular limitations on the average particle size of the pigment; for example, a size of about 0.05 to 5 μm is acceptable, and a size of about 0.08 to 2 μm is preferred. Furthermore, the average particle size of the pigment is set as the median diameter measured using a laser diffraction / scattering particle size distribution measuring device.

[0139] The amount of pigment in the adhesive layer 7 is not particularly limited as long as it is sufficient to color the separating component with the outer packaging material. For example, about 5 to 60% by mass can be listed, and preferably 10 to 40% by mass.

[0140] The thickness of the adhesive layer 7 is not particularly limited as long as it is sufficient to bond the protective layer 6 to the metal layer 1; for example, it can be about 1 μm or more, or about 2 μm or more. Alternatively, the thickness of the adhesive layer 7 can be, for example, about 10 μm or less, or about 5 μm or less. Furthermore, preferred ranges for the thickness of the adhesive layer 7 include approximately 1–10 μm, approximately 1–5 μm, approximately 2–10 μm, and approximately 2–5 μm.

[0141] [Coloring layer] A coloring layer is a layer provided as needed between the protective layer 6 and the metal layer 1 (illustration omitted). When an adhesive layer 7 is provided, a coloring layer can be provided between the protective layer 6 and the adhesive layer 7, and between the adhesive layer 7 and the metal layer 1. Alternatively, a coloring layer can be provided on the outside of the protective layer 6. By providing a coloring layer, the separating components can be colored with the outer packaging material.

[0142] The coloring layer can be formed, for example, by applying an ink containing a colorant to the surface of the protective layer 6 or the surface of the metal layer 1. Known substances such as pigments and dyes can be used as the colorant. Furthermore, only one type of colorant can be used, or two or more types can be mixed.

[0143] As a specific example of the colorant contained in the coloring layer, a substance that is the same as the substance exemplified in item [Adhesive Layer 7] can be shown.

[0144] The outer packaging material for the separator in this invention can be used as a separator disposed between multiple heating elements. In the separator, the outer packaging material for the separator can be used in a manner in which the heat-melting resin layer is on the side of the contents (e.g., cooling material) and is positioned opposite to the contents.

[0145] 3. Manufacturing method of outer packaging material for partition components Regarding the manufacturing method of the outer packaging material for the separator component, there are no particular limitations as long as a laminated body formed by stacking the layers of the outer packaging material for the separator component of the present invention can be obtained. Methods that include at least a laminated metal layer 1 and a heat-melting resin layer 2 can be listed. As described above, in the outer packaging material 10 for the separator component of the present invention, 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 further laminated as needed.

[0146] As an example of the manufacturing method of the outer packaging material for the separator component of the present invention, it is described below. First, a laminate (hereinafter sometimes referred to as "laminate A") is formed by sequentially stacking a protective layer 6, an adhesive layer 7, and a metal layer 1. Specifically, the laminate A can be formed by the following dry lamination method: applying the adhesive used for forming the adhesive layer 7 to the protective layer 6 or the metal layer 1, whose surface has been chemically surface-treated as needed, by a coating method such as gravure coating or roller coating, and drying it, then laminating the metal layer 1 or the protective layer 6 and curing the adhesive layer 7.

[0147] Next, a thermosetting resin layer 2 is laminated onto the metal layer 1 of the laminate A. When the thermosetting resin layer 2 is directly laminated onto the metal layer 1, it can be laminated onto the metal layer 1 of the laminate A by means of hot lamination, extrusion lamination, or the like. Alternatively, when an adhesive layer 3 is provided between the metal layer 1 and the thermosetting resin layer 2, the adhesive layer 3 and the thermosetting resin layer 2 can be laminated by, for example, (1) extrusion lamination, (2) hot lamination, (3) sandwich lamination, (4) dry lamination. As for (1) extrusion lamination, for example, methods such as laminating by extruding the adhesive layer 3 and the thermosetting resin layer 2 onto the metal layer 1 of the laminate A (co-extrusion lamination, tandem lamination), etc., can be listed. In addition, as for (2) hot lamination, for example, the following methods can be listed: a laminate formed by separately forming an adhesive layer 3 and a hot-melt resin layer 2, and then laminating it onto the metal layer 1 of the laminate A; a laminate formed by laminating an adhesive layer 3 onto the metal layer 1 of the laminate A, and then laminating it with the hot-melt resin layer 2, etc. In addition, as for (3) sandwich lamination, for example, the following methods can be listed: while molten adhesive layer 3 flows between the metal layer 1 of the laminate A and the pre-filmed hot-melt resin layer 2, the laminate A and the hot-melt resin layer 2 are bonded together via the adhesive layer 3, etc. In addition, as for (4) dry lamination, for example, the following methods can be listed: laminating the metal layer 1 of the laminate A by applying an adhesive solution for forming the adhesive layer 3 and drying it, or by further baking it, etc., and then laminating the pre-filmed hot-melt resin layer 2 onto the adhesive layer 3, etc.

[0148] When there is a resin layer 4 between the metal layer 1 and the heat-fusion resin layer 2, an adhesive layer 5 can be further provided, for example, by means of (1) extrusion lamination, (2) hot lamination, (3) sandwich lamination, (4) dry lamination, etc., in order to form the metal layer 1, adhesive layer 3, resin layer 4, adhesive layer 5 and heat-fusion resin layer 2.

[0149] As described above, a laminate is formed having, in sequence, 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-melting resin layer 2. To ensure strong adhesion of the adhesive layers 3, 5, and 7, the laminate can be subjected to heat treatment.

[0150] In the outer packaging material for separating components, the processing adaptability can be improved by performing surface activation treatments such as corona treatment, sandblasting treatment, oxidation treatment, and ozone treatment on each layer constituting the laminate as needed. For example, by performing corona treatment on the surface of the protective layer 6 opposite to the metal layer 1, the printability of ink on the surface of the protective layer 6 can be improved.

[0151] 4. Separating components The separator of the present invention is a separator disposed between multiple heating elements, having contents (cooling material, etc.) and an outer packaging material for packaging the contents. The outer packaging material is the aforementioned outer packaging material for the separator of the present invention.

[0152] Figure 6 This is a cross-sectional schematic diagram illustrating an example of the separating component of the present invention. For example... Figure 6 As shown, the separator 20 has a cooling material 21 and an outer packaging material 10 that seals the cooling material 21. The outer packaging material 10 is, for example, a... Figures 1 to 5 The dividing component shown is made of outer packaging material. The dividing component 20 is a bag formed by placing two pieces of outer packaging material 10 opposite each other with their respective heat-melting resin layers, and joining the ends 22 by heat melting. Cooling material 21 is sealed inside the bag.

[0153] In this invention, the outer packaging material is the aforementioned outer packaging material for the separator of this invention, thereby forming a separator that suppresses expansion.

[0154] In the partition member 20, the outer packaging material 10 is a component that seals the contents of the partition member 20, such as the cooling material 21. As described above, the outer packaging material of the partition member 20 is the partition member outer packaging material 10 of the present invention.

[0155] The contents of the separator 20 are components sealed within the outer packaging material. Furthermore, "sealed" means sealed inside a bag formed using the outer packaging material. The separator of the present invention is disposed between multiple heating elements; therefore, typically, the contents of the separator are cooling material 21.

[0156] The cooling material preferably contains at least one liquid selected from water, alcohols, esters, ethers, ketones, hydrocarbons, fluorinated compounds, and organosilicon oils. These liquids may be used alone or in mixtures of two or more.

[0157] Examples of alcohols include, for example, propanol, isopropanol, butanol, benzyl alcohol, phenylethanol, and other alcohols containing 3 to 8 carbon atoms; and alkylene glycols such as ethylene glycol and propylene glycol, and other alcohols with two or more carbon atoms. These can be used individually or in mixtures of two or more.

[0158] Examples of esters include alkyl aliphatic carboxylic acid esters, alkyl carbonate diesters, alkyl oxalate diesters, and fatty acid esters of ethylene glycol. These can be used individually or in mixtures of two or more.

[0159] Examples of ethers include n-butyl ether, n-propyl ether, and isopentyl ether. These can be used individually or in mixtures of two or more.

[0160] Examples of ketones include methyl ethyl ketone and diethyl ketone. These can be used individually or in mixtures of two or more.

[0161] Examples of hydrocarbons include heptane, octane, nonane, decane, toluene, and xylene. These can be used individually or in mixtures of two or more.

[0162] Examples of fluorinated 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-tetrafluorooctane (HFC-76-13sf). These can be used individually or in mixtures of two or more.

[0163] Examples of silicone-based oils include modified silicone oils such as methyl polysiloxanes, methyl phenyl polysiloxanes, cyclic methyl siloxanes, and silicone polyether copolymers. These can be used individually or in mixtures of two or more.

[0164] The cooling material preferably contains water. Water has a high heat of vaporization, so when the cooling material contains water, the heat-generating element can be cooled efficiently. In addition, water is chemically stable.

[0165] Furthermore, the cooling material can be any of the neutral, alkaline, or acidic types. When the cooling material is alkaline or acidic, the reaction between the cooling material and the metal layer is facilitated, thus significantly enhancing the effects of the present invention.

[0166] In addition, the cooling material may also contain a thickener. By using a thickener, the viscosity of the cooling material increases, thus increasing the contact time between the cooling material and the abnormally overheating heating element as the heating element peels off from the separator when it overheats abnormally. This allows for efficient cooling of the abnormally overheating heating element. Examples of thickeners include gelatin, xanthan gum, alginate, and carboxymethyl cellulose.

[0167] In addition, cooling materials may also contain antifreeze, preservatives, and pH adjusters.

[0168] In the partition component of the present invention, a core material may also be included as the contents. The core material is preferably capable of retaining the cooling material 21.

[0169] For example, porous materials can be used as core materials. Porous materials preferably contain at least one of fibrous and particulate components. Examples of porous materials containing fibrous components 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 particulate components include silica particles, alumina particles, calcium silicate, clay minerals, vermiculite, mica, cement, perlite, fumed silica, and aerogel. Examples of calcium silicate include calcareous silicate, shale silicate, wollastonite, and calcareous zeolite. Examples of clay minerals include magnesium silicate, montmorillonite, and kaolinite. Only one of these materials may be used, or two or more may be used in combination.

[0170] The method for manufacturing the separator of the present invention can be carried out using conventional methods. For example, two pieces of the above-described outer packaging material for the separator are prepared, and the heat-melting resin layers of each outer packaging material for the separator are overlapped with each other. The outer edges of three sides are then heat-melted to obtain a bag with one open side. After adding contents (e.g., cooling material, core material, etc.) into the bag through the opening, the opening is sealed, thereby obtaining the separator.

[0171] That is, when cooling material is housed in a package formed from the outer packaging material of the separator component of the present invention, the package is formed such that the heat-melting resin portion of the outer packaging material of the separator component of the present invention is the inner side (the surface in contact with the cooling material). Two pieces of the heat-melting resin of the outer packaging material of the separator component can be overlapped relative to each other, and the periphery of the overlapped outer packaging material of the separator component can be heat-melted to form the package. Alternatively, it can be as follows... Figure 8 As shown in the example, a single dividing piece is folded and overlapped with the outer packaging material, and the perimeter is heat-fused to form the packaging body. During folding and overlapping, it can be done as follows: Figure 8As shown in the example, the edges other than the folded edge are heat-fused together to form a package body through a three-sided seal. Alternatively, it can be folded in a way that forms a flange (the area where the heat-fused resin layers contact each other) to achieve a four-sided seal. This is possible as long as the cooling material can be impregnated and held within a porous material. It can also be rolled around the cooling material to seal the heat-fused resin layers together, thereby forming a heat-fused section. The openings at both ends are then heat-fused to seal the package. Furthermore, in the outer packaging material for the separating components, the recess for holding the cooling material can be formed by deep drawing or protrusion molding. For example... Figure 8 As shown in the example, a recess can be provided in the outer packaging material of one partition component while no recess is provided in the outer packaging material of another partition component, or a recess can be provided in the outer packaging material of another partition component.

[0172] The separator of the present invention can be configured between multiple heating elements for use.

[0173] 5. Structure The structure in this invention is a structure having multiple heating elements and a partition member disposed between the multiple heating elements, wherein the partition member is the aforementioned partition member of this invention.

[0174] Figure 7 This is a cross-sectional schematic diagram illustrating an example of the structure in this invention. For example... Figure 7 As shown, the structure 30 has a plurality of heating elements 31 and a partition member 20 disposed between the plurality of heating elements 31. The partition member 20 is, for example, as shown in the figure. Figure 6 The partition member is shown. Additionally, the structure 30 may have a housing 32 that houses multiple heating elements 31 and the partition member 20. Furthermore, in the structure 30, the partition member 20 can also be positioned between the bottom surface of the housing 32 and each heating element 31.

[0175] In the structure 30 of the present invention, the separating member is the separating member 20 of the present invention, therefore, the expansion of the separating member can be suppressed. Thus, the impact of the expansion of the separating member on the heating element can be reduced.

[0176] In the structure 30 of the present invention, the heat source 31 can be, for example, a battery (e.g., a single cell), an integrated circuit, a control panel, an electric motor, an engine, etc. When it is a battery, for example, the battery becomes a heat source when it heats up (e.g., abnormally heats up).

[0177] Examples of batteries include, for instance, lithium-ion secondary batteries, lithium-ion polymer batteries, lithium-ion all-solid-state batteries, semi-solid-state batteries, quasi-solid-state 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.

[0178] The purpose of the structure 30 of the present invention varies depending on the type of heating element 31.

[0179] For example, when the heating element is a secondary battery, the structure becomes a battery pack. Battery packs can be used, for example, in portable electronic devices, mobile communication devices, and vehicle power supplies.

[0180] Furthermore, for example, when the heat-generating element is an integrated circuit, the structure becomes a computer, etc. Furthermore, for example, when the heat-generating element is a control panel, the structure becomes various equipment such as manufacturing apparatus. Furthermore, for example, when the heat-generating element is an electric motor or engine, the structure becomes a moving body such as a vehicle.

[0181] Example The present invention will now be described in detail with reference to exemplary embodiments. However, the present invention is not limited to these embodiments.

[0182] [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, using a two-component curing polyurethane adhesive (polyester polyol and alicyclic isocyanate compound, with a cured thickness of 1.5 μm), the polyethylene terephthalate film of the protective layer and the metal layer were bonded together by dry lamination, thus creating a laminate with a protective layer / adhesive layer / metal layer stacked sequentially.

[0183] A chemical surface treatment was applied to both sides of the aluminum alloy foil to form a corrosion-resistant coating. The chemical surface treatment of the aluminum alloy foil was performed by applying the treatment solution A (described later) to both sides of the aluminum foil using a roller coating method followed by baking. The thickness of the corrosion-resistant coating A was 26 nm.

[0184] Next, an unstretched polypropylene film (CPP, 50 μm thick) was prepared as the heat-melting resin layer. Then, using adhesive A (described later), the metal layer side of the resulting laminate was bonded to the heat-melting resin layer via dry lamination, and adhesive layer A (1.5 μm thick after curing) / heat-melting resin layer was laminated on top of the metal layer. Next, the resulting laminate was cured and heated, thereby obtaining an outer packaging material for a partition component composed of a laminate consisting of a protective layer / adhesive layer / metal layer / adhesive layer A / heat-melting resin layer stacked sequentially.

[0185] [Example 2] Following the same procedure as in Example 1, a laminate consisting of a protective layer, an adhesive layer, and a metal layer was fabricated. Also following the same procedure as in Example 1, both sides of the aluminum alloy foil were chemically surface-treated using the treatment solution A described later, forming a corrosion-resistant coating A. The thickness of the corrosion-resistant coating A was 26 nm.

[0186] Next, an unstretched polypropylene film (CPP, 50 μm thick) was prepared as the heat-melting resin layer. Additionally, a biaxially stretched nylon film (15 μm thick) was prepared as the resin layer disposed between the metal layer and the heat-melting resin layer. Using adhesive A (described later), the metal layer side of the resulting laminate was bonded to the resin layer via dry lamination, and adhesive layer A (1.5 μm thick after curing) / resin layer was laminated on top of the metal layer. Next, using adhesive A (described later), the resin layer side of the resulting laminate was bonded to the heat-melting resin layer via dry lamination, and adhesive layer A (1.5 μm thick after curing) / heat-melting resin layer was laminated on top of the resin layer. Next, the obtained laminate is cured and heated, thereby obtaining an outer packaging material for a partition component composed of a laminate consisting of a protective layer, an adhesive layer, a metal layer, an adhesive layer A, a resin layer, an adhesive layer A, and a thermoplastic resin layer stacked in sequence.

[0187] [Example 3] Using treatment solution B (described later) instead of treatment solution A, a chemical surface treatment was performed on both sides of the aluminum alloy foil to form a corrosion-resistant coating B. Otherwise, the procedure was the same as in Example 1, resulting in an outer packaging material for a partition component consisting of a laminate consisting of a protective layer, an adhesive layer, a metal layer, adhesive layer A, and a thermosetting resin layer. The thickness of the corrosion-resistant coating B was 23 nm.

[0188] [Example 4] Using treatment solution C (described later) instead of treatment solution A, a chemical surface treatment was performed on both sides of the aluminum alloy foil to form a corrosion-resistant coating C. Otherwise, the procedure was the same as in Example 1, resulting in an outer packaging material for a partition component consisting of a laminate consisting of a protective layer, an adhesive layer, a metal layer, adhesive layer A, and a thermosetting resin layer. The thickness of the corrosion-resistant coating C was 15 nm.

[0189] [Example 5] Using treatment solution D (described later) instead of treatment solution A, a chemical surface treatment was performed on both sides of the aluminum alloy foil to form a corrosion-resistant coating D. Otherwise, the procedure was the same as in Example 1, resulting in an outer packaging material for a partition component consisting of a laminate consisting of a protective layer, an adhesive layer, a metal layer, adhesive layer A, and a thermosetting resin layer. The thickness of the corrosion-resistant coating D was 17 nm.

[0190] [Example 6] Using treatment solution E (described later) instead of treatment solution A, a chemical surface treatment was performed on both sides of the aluminum alloy foil to form a corrosion-resistant coating E. Otherwise, the procedure was the same as in Example 1, resulting in an outer packaging material for a partition component consisting of a laminate consisting of a protective layer, an adhesive layer, a metal layer, adhesive layer A, and a thermosetting resin layer. The thickness of the corrosion-resistant coating E was 29 nm.

[0191] [Example 7] As an adhesive, adhesive B (described later) is used instead of adhesive A to bond the metal layer side of the laminate containing the protective layer / adhesive layer / metal layer to the thermoplastic resin layer. Otherwise, the same procedure as in Example 1 is followed to obtain an outer packaging material for a partition component consisting of a laminate containing the protective layer / adhesive layer / metal layer / adhesive layer B / thermoplastic resin layer.

[0192] [Example 8] As an adhesive, adhesive C, described later, is used instead of adhesive A to bond the metal layer side of the laminate containing the protective layer, adhesive layer, and metal layer in sequence to the thermoplastic resin layer. Otherwise, the same procedure as in Example 1 is followed to obtain an outer packaging material for a partition component consisting of a laminate containing the protective layer, adhesive layer, metal layer, adhesive layer C, and thermoplastic resin layer in sequence.

[0193] [Example 9] 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, using adhesive A (1.5 μm thick after curing) described later, the polyethylene terephthalate film of the protective layer and the metal layer were bonded together by dry lamination to create a laminate containing a protective layer, an adhesive layer, and a metal layer in sequence.

[0194] A chemical surface treatment was applied to both sides of the aluminum alloy foil to form a corrosion-resistant coating. The chemical surface treatment of the aluminum alloy foil was performed by applying the treatment solution A (described later) to both sides of the aluminum foil using a roller coating method followed by baking. The thickness of the corrosion-resistant coating A was 26 nm.

[0195] Next, an unstretched polypropylene film (CPP, 50 μm thick) was prepared as the heat-melting resin layer. Then, using adhesive A (described later), the metal layer side of the resulting laminate was bonded to the heat-melting resin layer via dry lamination. Adhesive layer A (cured thickness 1.5 μm) and the heat-melting resin layer were then laminated on top of the metal layer. The resulting laminate was then cured and heated, thereby obtaining an outer packaging material for a partition component composed of a laminate consisting of a protective layer, adhesive layer A, a metal layer, adhesive layer A, and a heat-melting resin layer stacked sequentially.

[0196] [Example 10] Following the same procedure as in Example 9, a laminate consisting of a protective layer, an adhesive layer A, and a metal layer was fabricated. Following the same procedure as in Example 1, both sides of the aluminum alloy foil were chemically surface-treated using the treatment solution A described later, forming a corrosion-resistant coating A. The thickness of the corrosion-resistant coating A was 26 nm.

[0197] Next, an unstretched polypropylene film (CPP, 50 μm thick) was prepared as the heat-melting resin layer. Additionally, a biaxially stretched nylon film (15 μm thick) was prepared as the resin layer disposed between the metal layer and the heat-melting resin layer. Using adhesive A (described later), the metal layer side of the resulting laminate was bonded to the resin layer via dry lamination, and adhesive layer A (1.5 μm thick after curing) / resin layer was laminated on top of the metal layer. Next, using adhesive A (described later), the resin layer side of the resulting laminate was bonded to the heat-melting resin layer via dry lamination, and adhesive layer A (1.5 μm thick after curing) / heat-melting resin layer was laminated on top of the resin layer. Next, the obtained laminate is cured and heated to obtain an outer packaging material for a partition component, which is composed of a laminate consisting of a protective layer, an adhesive layer A, a metal layer, an adhesive layer A, a resin layer, an adhesive layer A, and a thermoplastic resin layer stacked in sequence.

[0198] [Comparative Example 1] Except for not performing chemical surface treatment on the aluminum alloy foil, the same procedure as in Example 1 was followed to obtain an outer packaging material for a partition component consisting of a laminate consisting of a protective layer, an adhesive layer, a metal layer, an adhesive layer A, and a thermoplastic resin layer stacked sequentially.

[0199] [Comparative Example 2] Except for not performing chemical surface treatment on the aluminum alloy foil, the same procedure as in Example 7 was followed to obtain an outer packaging material for a partition component consisting of a laminate consisting of a protective layer, an adhesive layer, a metal layer, an adhesive layer B, and a thermoplastic resin layer stacked sequentially.

[0200] [Adhesive] • Adhesive A: Polyolefin adhesive (Composition: Main agent containing modified polyolefin and curing agent containing epoxy compound) • Adhesive B: Polyurethane adhesive (Composition: a main agent containing polyether polyol and a curing agent containing aromatic isocyanate compounds) • Adhesive C: Polyurethane adhesive (Composition: a main agent containing polyester polyol and a curing agent containing aliphatic isocyanate and aromatic isocyanate) [Treatment solution] • Treatment Solution A: A chemical surface treatment solution containing chromium phosphate and acrylic resin. • Treatment Solution B: Chemical surface treatment solution containing zirconium phosphate • Treatment solution C: Chemical surface treatment solution containing zirconium phosphate and organic resin (rich in inorganic components) • Treatment solution D: Chemical surface treatment solution containing zirconium phosphate and organic resin (rich in organic components) • Treatment solution E: A chemical surface treatment solution containing chromium phosphate and organic resin. [XPS Analysis of Corrosion-Resistant Coating] X-ray photoelectron analysis (XPS analysis) was performed on the surfaces of the corrosion-resistant coatings A-E used in the examples and the surface of the aluminum alloy foil without a corrosion-resistant coating (Ref: untreated ALM) used in the comparative examples under the following test conditions to determine the atomic composition ratio (at%) of each element. In this test, the surfaces of the aluminum alloy foils were exposed by peeling off each laminate, wiped with an organic solvent, and measured after drying. The results are shown in Table 1.

[0201] <Measurement Conditions> • Equipment used: “PHI5000VersaProbeIII” (PHI-manufactured scanning X-ray photoelectron spectrometer) • Spectral acquisition conditions Incident X-rays: AlKα (monochromatic X-rays, hν = 1486.6 eV) X-ray output: 50W (15kV·3.3mA) X-ray beam diameter: 200μmφ X-ray scan: 700μm × 200μm (surface XPS analysis) Photoelectron capture angle: 45 degrees Charge neutralization: electron neutralization gun, low-acceleration ion irradiation • Low-velocity electron irradiation conditions: emission current 10μA, bias potential 1.0V • Low-acceleration ion irradiation conditions: ion species Ar+, accelerating voltage 0.11kV, emission current 7mA [Table 1] [Evaluation of the expansion of the partition components] Two of each of the separator components obtained in the examples and comparative examples were prepared using outer packaging material, each measuring TD100mm × MD150mm. Next, the heat-sealing resin layers of the outer packaging material were overlapped, and the outer edges on three sides were heat-sealed to obtain a bag with one side opening of 150mm. Then, 70mm × 100mm glass wool was placed inside the bag, and 10g of water was injected. Afterward, the internal pressure of the bag was reduced to approximately 100Pa, and the opening of the bag was heat-sealed (sealing width 10mm). This yielded the separator component used as the test sample. An accelerated test was conducted: the obtained separator component was stored in a constant temperature bath at a relative humidity below 10%, a temperature of 90°C, and a relative humidity below 10% for 30 days. The presence or absence of expansion in the separator component after the accelerated test was confirmed by both visual inspection and palpation; expansion was considered to have occurred if expansion was confirmed by either method. The results are shown in Table 2.

[0202] [Evaluation of the airtightness of outer packaging materials] The partition components obtained in the examples and comparative examples were made into a size of TD100mm × MD150mm using outer packaging material. Using a PCT apparatus (HAST testing machine PC-R8 manufactured by Hirayama Seisakusho), the outer packaging material was stored in a humid and hot environment (temperature 120°C, relative humidity 100%, pressure 0.199MPa) for 16 days. The adhesion strength of the outer packaging material before and after storage was measured. The adhesion strength was measured at the interface between the metal layer and the heat-fused resin layer of the outer packaging material (the part where the adhesive layer adheres to the metal layer). The specific method for measuring the adhesion strength is described below. Each partition component was further cut into rectangles of TD15mm × MD100mm using the outer packaging material as test samples. Next, the metal layer (aluminum alloy foil) of the test sample was partially T-shapedly peeled from the layer bonded by the adhesive layer and the metal layer (a thermoplastic resin layer in Examples 1, 3-8 and Comparative Examples 1, 2, and a resin layer in Example 2) in the MD direction. The aluminum alloy foil side and the thermoplastic resin layer side were then fixed on the clamps of a tensile testing machine with the MD direction as the tensile direction. The adhesion strength was measured at a clamping distance of 50 mm and a tensile speed of 100 mm / min. The results are shown in Table 2.

[0203] [Table 2] As described above, the present invention provides an invention in the manner shown below.

[0204] Item 1. An outer packaging material for a separating component, which is used in a separating component disposed between multiple heating elements. The outer packaging material for the aforementioned partition components is composed of a laminate having at least a metal layer and a heat-melting resin layer. The metal layer has a corrosion-resistant coating on the side of the heat-fusion resin layer.

[0205] Item 2. The outer packaging material for the separator as described in Item 1, wherein the atomic composition ratio of Cr or Zr detected by X-ray photoelectron analysis of the corrosion-resistant coating is 0.1 at% or more.

[0206] Item 3. The outer packaging material for the partition component as described in Item 1 or 2, wherein the thickness of the corrosion-resistant coating is 1 nm or more.

[0207] Item 4. The outer packaging material for the partition component as described in any one of items 1 to 3, wherein an adhesive layer is further provided between the metal layer and the thermoplastic resin layer.

[0208] Item 5. The outer packaging material for the separating component as described in Item 4, wherein the adhesive layer is formed from a cured polyolefin adhesive.

[0209] Item 6. The outer packaging material for the partition component as described in any one of items 1 to 5, wherein an adhesive layer is further provided between the metal layer and the heat-melting resin layer. A resin layer is also provided between the adhesive layer and the thermoplastic resin layer.

[0210] Item 7. The outer packaging material for the partition component as described in any one of items 1 to 6, wherein a protective layer is further provided on the side of the metal layer opposite to the side of the heat-fusion resin layer.

[0211] Item 8. The outer packaging material for the partition component as described in any one of items 1 to 7, wherein the metal layer comprises aluminum.

[0212] Item 9. The outer packaging material for the partition component as described in any one of items 1 to 8, wherein the aforementioned heat-melting resin layer comprises polypropylene.

[0213] Item 10. The outer packaging material for the separator as described in any one of items 1 to 9, wherein the heating element is a battery.

[0214] Item 11. A separating member disposed between a plurality of heating elements. The aforementioned partition has contents and outer packaging material for packaging the contents. The aforementioned outer packaging material is the outer packaging material for the partition component as described in any one of items 1 to 9.

[0215] Item 12. The partition as described in Item 11, wherein the contents comprise water.

[0216] Item 13. The partition component as described in Item 11, wherein the heating element is a battery.

[0217] Item 14. A structure having a plurality of heating elements and a partition member disposed between the plurality of heating elements. The aforementioned separating component is the separating component described in item 11.

[0218] Item 15. The structure as described in Item 14, wherein the heating element is a battery.

[0219] Item 16. A method for manufacturing an outer packaging material for a separating component, wherein the outer packaging material for a separating component disposed between a plurality of heating elements is manufactured. The above manufacturing method includes the step of obtaining a laminate containing at least a metal layer and a thermosetting resin layer. The metal layer has a corrosion-resistant coating on the side of the heat-fusion resin layer.

[0220] Symbol Explanation 1: Metal layer; 2: Heat-melting resin layer; 3: Adhesive layer; 4: Resin layer; 5: Adhesive layer; 6: Protective layer; 7: Adhesive layer; 10: Outer packaging material for partition components; 20: Partition component; 21: Cooling material; 22: End; 30: Structure; 31: Heating element; 32: Housing.

Claims

1. An outer packaging material for a separator component, characterized in that: It is the outer packaging material for the partition components used in the partitioning parts disposed between multiple heating elements. The outer packaging material for the separating component is composed of a laminate having at least a metal layer and a heat-melting resin layer. The metal layer has a corrosion-resistant coating on the side of the thermoplastic resin layer.

2. The outer packaging material for the separator component as described in claim 1, characterized in that: The corrosion-resistant coating has an atomic composition ratio of Cr or Zr of 0.1 at% or higher, as detected by X-ray photoelectron analysis.

3. The outer packaging material for the separating component as described in claim 1 or 2, characterized in that: The thickness of the corrosion-resistant coating is 1 nm or more.

4. The outer packaging material for the separating component as described in claim 1 or 2, characterized in that: An adhesive layer is also provided between the metal layer and the thermoplastic resin layer.

5. The outer packaging material for the separator component as described in claim 4, characterized in that: The adhesive layer is formed from the cured product of a polyolefin adhesive.

6. The outer packaging material for the separating component as described in claim 1 or 2, characterized in that: An adhesive layer is also provided between the metal layer and the thermosetting resin layer. A resin layer is also provided between the adhesive layer and the thermoplastic resin layer.

7. The outer packaging material for the separating component as described in claim 1 or 2, characterized in that: A protective layer is also provided on the side of the metal layer opposite to the side of the thermoplastic resin layer.

8. The outer packaging material for the separating component as described in claim 1 or 2, characterized in that: The metal layer contains aluminum.

9. The outer packaging material for the separating component as described in claim 1 or 2, characterized in that: The heat-fusion resin layer comprises polypropylene.

10. The outer packaging material for the separating component as described in claim 1 or 2, characterized in that: The heating element is a battery.

11. A separating component, characterized in that: It is a separator component configured between multiple heating elements. The separating component has contents and outer packaging material for packaging the contents. The outer packaging material is the outer packaging material for the separator component as described in claim 1 or 2.

12. The separating member as claimed in claim 11, characterized in that: The contents contain water.

13. The separating member as claimed in claim 11, characterized in that: The heating element is a battery.

14. A structure, characterized in that: It is a structure having multiple heating elements and a partition component disposed between the multiple heating elements. The separating component is the separating component as described in claim 11.

15. The structure as described in claim 14, characterized in that: The heating element is a battery.

16. A method for manufacturing an outer packaging material for a separating component, characterized in that: It is a method for manufacturing the outer packaging material of the partition component used in the partition component disposed between multiple heating elements. The manufacturing method includes the step of obtaining a laminate containing at least a metal layer and a thermosetting resin layer. The metal layer has a corrosion-resistant coating on the side of the thermoplastic resin layer.

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