JP2016159972A - Film coated article and method for producing film coated article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film coated article which suppresses occurrence of flotation of a bridge and a film occurring on a side face, and is excellent in appearance.SOLUTION: A film coated article 10 has a top face 11a, a bottom face 11b, and side faces 11c and 11d. An electrode terminal 13 includes a battery cell 11 provided on the top face 11a, and a film 12 covering at least the bottom face 11b and the side faces 11c and 11d of the battery cell 11. The film 12 contains: a multilayer film containing three or more multiple layers in which an A layer and a B layer are layered; and a resin layer provided on a side in contact with the surface of the battery cell 11 of the multilayer film. The resin layer contains a polycarbonate-based urethane resin as a main component.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a film-coated article and a method for producing a film-coated article.

  Patent Document 1 discloses a film-coated article in which a film softened by heating is placed on an article, and the film is adhered to the surface of the article by deaeration between the article and the film from one side of the article. doing. In Patent Document 1, it is described that the surface of an article can be easily and reliably protected by a film.

  FIG. 17 shows an example of a conventional film-coated article (a photograph of a film-coated article produced in a comparative example). The film-coated article shown in FIG. 17 is composed of a substantially rectangular parallelepiped article and a film that covers the entire surface of the article. The film-coated article has a packaging form in which air between the article and the film is degassed and the film is in close contact with the surface of the article. The deaeration direction is the direction indicated by the arrow.

JP2013-252894A

  By the way, in the conventional film-coated article, when there is a part with a large change in outer shape on the deaeration side of the article (for example, when there is a substantially right angle), the vicinity of the side surface connected to the part with a large change in outer shape. In some cases, a so-called bridge is generated and the appearance is deteriorated (see FIG. 17 of the present application). A bridge is a rise or wrinkle of a film that is attached to a palm. For example, when a battery cell is used as an article, if a bridge is formed on the side surface of the film-coated article, not only the appearance is deteriorated, but also insulation, thermal conductivity, etc. may be lowered, and modularization may occur. In this case, it may be impossible to accommodate in the specified space. Moreover, in the conventional film-coated article, when the temperature of the heated film returns to room temperature, the film may float from the surface of the article and a large air layer may be formed between the article and the film. For example, when a large air layer is formed between the battery cell and the film, it is conceivable that the insulating properties, heat dissipation properties, and the like are lowered, and the battery performance is lowered accordingly.

  An object of the present invention is to provide a film-coated article having a good appearance by suppressing the occurrence of bridges and film floating on the side surfaces.

  The film-coated article according to the present invention has an upper surface, a bottom surface, and a side surface, and an article provided with a connection portion with another member on the upper surface, and a film that covers at least the bottom surface and the side surface of the article The film is provided on the side of the multilayer film in contact with the surface of the article, the multilayer film including three or more multilayer parts in which the A layer and the B layer are laminated. The resin layer is a resin layer mainly composed of a polycarbonate-based urethane resin.

  The method for producing a film-coated article according to the present invention includes a first step of heating and softening the film and covering the article with the film, and a main film adhesion holding surface among the side surfaces of the article in a deaeration direction. And a second step of deaerating between the article and the film from the upper surface side of the article and bringing the film into close contact with the surface of the article in a state of being positioned laterally with respect to the article. It is characterized by that.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the bridge | bridging which arises in a side surface and a film can be suppressed, and a film-coated article with a good appearance can be provided. For example, even when there is a portion having a large external shape change on the deaeration side of the article, the multilayer film extends well, and the adhesion of the film to the surface of the article becomes good. In particular, the film of the present invention is provided with a resin layer mainly composed of a polycarbonate-based urethane resin on the contact surface with the article, and therefore has good adhesion to the surface of the article (particularly when it has a metal surface such as aluminum). The state can be maintained for a long time. On the other hand, when the film needs to be peeled off, the film is not completely bonded to the surface of the article and can be easily peeled off.

It is a perspective view of a film covering article which is an example of an embodiment of the present invention. It is AA sectional view taken on the line of FIG. It is BB sectional drawing of FIG. It is CC sectional view taken on the line of FIG. It is sectional drawing of the multilayer film which is an example of embodiment of this invention. It is sectional drawing of the multilayer film which is another example of embodiment of this invention. It is a perspective view of the film covering article which is other examples of the embodiment of the present invention. It is DD sectional view taken on the line of FIG. It is a figure for demonstrating the manufacturing method of the film-coated article shown in FIG. It is a figure for demonstrating the manufacturing method of the film-coated article shown in FIG. It is a figure for demonstrating the manufacturing method of the film-coated article shown in FIG. It is a figure for demonstrating the manufacturing method of the film-coated article shown in FIG. It is a perspective view (disassembled perspective view) of the battery module using the film covering article which is other examples of the embodiment of the present invention. It is a perspective view of the film covering article which is other examples of the embodiment of the present invention. It is a figure which shows the case where the height of a base is made low in FIG. 2 is a photograph of a film-coated article produced in Example 1. 2 is a photograph of a film-coated article produced in Comparative Example 1.

Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.
The drawings referred to in the embodiments are schematically described, and the dimensional ratios of the components drawn in the drawings may be different from the actual products. Specific dimensional ratios and the like should be determined in consideration of the following description.

  Below, although battery cell 11 and 71 is illustrated as an article which comprises a film covering article, an article is not limited to this. For example, the article may be a battery cell having another form such as a cylindrical shape, or may be an article other than the battery cell.

The film-coated article 10 which is an example of embodiment is shown in FIGS.
The film-coated article 10 includes a battery cell 11 having an upper surface 11a, a bottom surface 11b, and four side surfaces 11c and 11d, and a film 12 that covers at least the bottom surface 11b and the side surfaces 11c and 11d of the battery cell 11. That is, the film-coated article 10 is a battery cell coated with a film, and the film 12 protects the battery cell 11 from being damaged, for example, to prevent the battery cell 11 from being damaged, and to insulate the battery cell 11 from the surroundings. It also has a function to do. The film-coated article 10 covers the battery cell 11 by covering the battery cell 11 with the film 12 softened by heating, and degassing the battery cell 11 and the film 12 from the upper surface 11a side of the battery cell 11. It has a structure in which the film 12 is in close contact with the surface. As will be described in detail later, the film 12 is provided on the side of the multilayer film 18 that contacts the surface of the battery cell 11 and the multilayer film 18 including three or more multilayer portions 28 in which the A layer and the B layer are laminated. Resin layer 19 formed. The resin layer 19 is a resin layer mainly composed of a polycarbonate-based urethane resin.

  The battery cell 11 has, for example, a substantially rectangular parallelepiped shape, and has an upper surface 11a, a bottom surface 11b, and four side surfaces 11c and 11d. On the upper surface 11a, a pair of electrode terminals 13 which are connecting portions with other members are provided so as to protrude upward. The top surface 11a and the bottom surface 11b have a short side and a long side, and the four side surfaces 11c and 11d include a side surface 11c on the short side and a side surface 11d on the long side. The relationship between the short side length X, the long side length Y, and the height Z is X <Z <Y. That is, the side surface 11d, the top surface 11a, the bottom surface 11b, and the side surface 11c are arranged in descending order of area. The battery cell 11 illustrated in FIG. 1 is a so-called square battery cell. The metal of the battery cell 11 is mainly made of aluminum metal. For example, a plurality of battery cells 11 are arranged in a module along the short side direction so that the side surfaces 11d on the long side face each other (see FIG. 13 to be described later), and are placed on a vehicle or real estate. Used for use.

  The battery cell 11 is preferably covered with a single film 12. In the present embodiment, the film 12 is tightly held on a portion of the surface of the battery cell 11 other than the upper surfaces 13 a of the pair of electrode terminals 13. The film 12 is in close contact with the entire bottom surface 11b and the four side surfaces 11c and 11d of the battery cell 11, and is also in close contact with the upper surface 11a of the battery cell 11 and the side surface 13b of the electrode terminal 13 (see FIG. 3 and FIG. 3). (See FIG. 4). In the drawing, the film 12 is shown separated from the surface of the battery cell 11 so that the film 12 can be easily discriminated, but actually, the film 12 is in close contact with the surface of the battery cell 11.

  The film 12 has an inner surface contact portion 29 in which the inner surfaces of the film are in close contact with each other at least in a portion covering the upper surface 11 a of the battery cell 11. The inner surface contact portion 29 is formed at a location above the upper surface 11a of the battery cell 11 and where the electrode terminal 13 is not present (see FIGS. 3 and 4). In FIG. 4, the inner surface contact portion 29 is formed between the pair of electrode terminals 13, but the place where the inner surface contact portion 29 is formed is not particularly limited. For example, the outer region of the pair of electrode terminals 13 and the corner region of the upper surface 11a of the battery cell 11 (for example, the bridge 55 formed in the corner region in FIG. 12 described later is also an example of the inner surface contact portion 29). Etc. may be formed. In FIG. 4, the inner surface contact portion 29 is shown with dots. When the bridge is formed on the side surface of the film-coated article 10, the above-described problems may occur. However, the inner surface contact portion 29 formed on the upper surface of the film-coated article 10 fixes the film 12 to the surface of the battery cell 11. It suppresses peeling of the film 12. In this way, the film 12 is in close contact with substantially the entire six surfaces of the battery cell 11, but the long side surface 11d having the maximum area is the main film contact holding surface.

  The film-coated article 10 is formed by covering a battery cell 11 with a film 12 softened by heating and degassing the battery cell 11 and the film 12 from the upper surface 11a side of the battery cell 11. That is, the degassing direction is the vertical direction of the battery cell 11 along the four side surfaces 11c and 11d, and the upper surface 11a side is the degassing side. The film-coated article 10 can be manufactured by the same method as the method for manufacturing the film-coated article 50 described with reference to FIGS. 9 to 12 described later.

Hereinafter, the configuration of the film 12 will be described in detail with reference to FIGS. 5 and 6.
FIG. 5 is a cross-sectional view showing an example of the laminated structure of the film 12. FIG. 6 is a cross-sectional view showing another example of the laminated structure of the film 12.

  As shown in FIG. 5, the film 12 contacts the surface of the battery cell 11 of the multilayer film 18 including a total of three or more multilayer portions 28 in which the A layer 21 and the B layer 22 are laminated. And a resin layer 19 provided on the side to be processed. The resin layer 19 is the innermost layer of the film 12 that contacts the surface of the battery cell 11.

  The multilayer film 18 illustrated in FIG. 5 has a base layer portion 20 including a plurality of multilayer portions 28 and a surface layer formed on the surface of the base layer portion 20. Each multilayer portion 28 may be laminated via a layer other than the A layer 21 and the B layer 22, but is preferably laminated adjacent to each other. That is, it is preferable that the plurality of A layers 21 and B layers 22 are alternately stacked.

  The fact that the A layers 21 and the B layers 22 are alternately laminated includes that they are substantially alternately laminated. For example, when a two-layer three-layer configuration of A layer 21 / B layer 22 / A layer 21 is laminated as a repeating unit, “A layer 21 / B layer 22 / A layer 21 / A layer 21 / B layer 22 / A layer” 21 / A layer 21 / B layer 22 / A layer 21..., But the portion of “A layer 21 / A layer 21” is substantially the same as the layer A 21 because the same kind of resin is laminated. It can be regarded as one layer. Thus, in the present application, “substantially laminated alternately” means that when the same kind of layers are laminated, it may be regarded as one layer, and as a result, the A layer 21 and the B layer 22 are alternately arranged. It is the meaning including what is laminated | stacked.

  As the surface layer, an inner layer 23 formed on one surface of the base layer portion 20 and an outer layer 24 formed on the other surface of the base layer portion 20 are provided. The inner layer 23 is the innermost layer of the multilayer film 18 facing the battery cell 11 side that is the article to be coated, and the outer layer 24 is the outermost layer of the multilayer film 18. In the present embodiment, the inner layer 23 constitutes the outermost layer of the film 12. In the present embodiment, the resin layer 19 is formed on the inner layer 23 of the multilayer film 18.

  The multilayer film 18 is not particularly limited as to whether or not it is stretched, but is preferably an unstretched film that is not substantially stretched. In the present specification, an unstretched film is a film produced without undergoing a stretching process as performed in the process of producing a shrink film, and more specifically, a stretching ratio is less than 2%, preferably Means less than 1% film. By using an unstretched film, it becomes easy to obtain a packaging form with a good appearance.

  Each layer, the inner layer 23, and the outer layer 24 constituting the base layer portion 20 may be made of other components (additives) other than the resin components described later, for example, a lubricant, a filler, a heat stabilizer, an antioxidant, and an ultraviolet ray as necessary. It may contain an absorbent, an antistatic agent, an antifogging agent, a flame retardant, a colorant (pigment), a pinning agent (alkaline earth metal), a softening agent and the like. These components may use only 1 type and may use 2 or more types.

  The base layer portion 20 includes three or more multilayer portions 28, and preferably includes 5 to 30 multilayer portions 28. That is, the total of the A layer 21 and the B layer 22 is at least 6 layers or more, preferably 10 to 60 layers. The upper limit of the number of layers of the A layer 21 and the B layer 22 is not particularly limited, but is preferably 200 layers or less, and more preferably 60 layers or less, from the viewpoint of productivity and the like. The number of laminated layers is 6 layers or more, preferably 10 to 60 layers, so that the side surface 11c to the side surface 11d or the side surface 11c and the side surface corner portion where the side surface 11d is connected has no bridge and a good-looking packaging form. Can be obtained. Moreover, the transparency of the multilayer film 18 is improved, and the design of the package is further improved. Further, excellent extensibility can be obtained while the laser cutability described later is good. The outermost surface of the base layer portion 20 may be either the A layer 21 or the B layer 22. For example, one outermost surface may be the A layer 21 and the other outermost surface may be the B layer 22. Alternatively, both sides may be the A layer 21 or both sides may be the B layer 22.

  From the viewpoint of productivity and the like, each of the A layer 21 and the B layer 22 is substantially the same in all layers (for example, the resin product constituting the layer is substantially the same, and the difference in layer thickness is different. It is preferably within the range of manufacturing error.

[A layer 21]
The A layer 21 imparts appropriate mechanical strength to the multilayer film 18, for example, and improves the durability of the multilayer film 18 at the time of manufacture, distribution, use, and the like. Suitable resins constituting the A layer 21 are resins having a higher melting point than the resin constituting the B layer 22, and are polyamide-based resins, polyolefin-based resins (particularly polypropylene-based resins), polyester-based resins, and polystyrene-based resins. And other thermoplastic resins. By using a resin having a melting point higher than that of the resin constituting the B layer 22, the durability of the multilayer film 18 is improved, and the film 12 is melted or softened before the film 12 is heated and attached to the battery cell 11. There is an advantage that the temperature of the inner layer 23 and the B layer 22 is not easily lowered. Of these, polyamide resins, polyester resins, and polystyrene resins are more preferable, and polyamide resins are particularly preferable. These resins may be used alone or in combination of two or more.

  The A layer 21 is, for example, a resin layer having a higher absorption rate of laser light α, which will be described later, than the B layer 22. The higher absorption rate of the laser beam α means that the A layer 21 has a higher absorption rate of the laser beam α when the A layer 21 and the B layer 22 are compared with each other. The A layer 21 preferably has a higher absorption rate of the laser light α per unit volume than the B layer 22. The absorptance of the laser beam α in each layer can be measured using a spectroscopic measurement device.

  Polyamides (nylon-6), poly-ω-aminoheptanoic acid (nylon-7), poly-ω-aminononanoic acid (nylon-9), polyundecanamide (nylon-11), polylauryl Lactam (nylon-12), polyethylenediamine adipamide (nylon-2,6), polytetramethylene adipamide (nylon-4,6), polyhexamethylene adipamide (nylon-6,6), polyhexa Methylene sebacamide (nylon-6,10), polyhexamethylene dodecamide (nylon-6,12), polyoctamethylene adipamide (nylon-8,6), polydecamethylene adipamide (nylon-10, 8) Caprolactam / lauryl lactam copolymer (nylon-6 / 12), hexamethylene diamine Nylon-6T composed of styrene and terephthalic acid, Nylon-6I composed of hexamethylenediamine and isophthalic acid, Nylon-9T composed of nonanediamine and terephthalic acid, Nylon-M5T composed of methylpentadiamine and terephthalic acid It is done.

  As the polypropylene resin, a crystalline polypropylene resin can be used. For example, crystalline propylene homopolymer, crystalline propylene-ethylene random copolymer, crystalline propylene-α-olefin random copolymer, crystalline block copolymer of at least one of ethylene and α-olefin and propylene, etc. Is mentioned. The α-olefin is preferably an α-olefin having 4 to 10 carbon atoms such as 1-butene, 1-pentene, 1-hexene, 1-octene and 1-decene.

Examples of the polyester-based resin include various polyesters composed of a dicarboxylic acid component and a diol component as essential components (that is, polyesters containing at least a structural unit derived from dicarboxylic acid and a structural unit derived from diol). Can be mentioned.
Examples of the dicarboxylic acid (dicarboxylic acid component) include terephthalic acid, isophthalic acid, phthalic acid, 2,5-dimethylterephthalic acid, 5-t-butylisophthalic acid, 4,4′-biphenyldicarboxylic acid, and trans-3. , 3′-stilbene dicarboxylic acid, trans-4,4′-stilbene dicarboxylic acid, 4,4′-dibenzyldicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,3-naphthalene Dicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, 2,2,6,6-tetramethylbiphenyl-4,4′-dicarboxylic acid, 1,1,3-trimethyl-3-phenyl Indene-4,5-dicarboxylic acid, 1,2-diphenoxyethane-4,4′-dicarboxylic acid, diphenyl ether dical Aromatic dicarboxylic acids such as acid, 2,5-anthracene dicarboxylic acid, 2,5-pyridinedicarboxylic acid, and substituted products thereof; oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberin Acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, tridecanedioic acid, tetradecanedioic acid, pentadecanedioic acid, heptadecanedioic acid, octadecanedioic acid, nonadecanedioic acid, icosanedioic acid, docosanedioic acid, 1, Aliphatic dicarboxylic acids such as 12-dodecanedioic acid and substituted products thereof; 1,3-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid 1,4-decahydronaphthalenedicarboxylic acid, 1,5-decahydronaphthalene Carboxylic acid, 2,6-decahydronaphthalene dicarboxylic acid, and include alicyclic dicarboxylic acids such as substituted versions thereof. The said dicarboxylic acid may use only 1 type and may use 2 or more types.
Examples of the diol (diol component) include ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, and 1,5-pentanediol. 2,2-dimethyl-1,3-propanediol (neopentyl glycol), 1,6-hexanediol, 2-ethyl-2-methyl-1,3-propanediol, 2,2-diethyl-1,3 -Propanediol, 1,8-octanediol, 2-ethyl-2-butyl-1,3-propanediol, 2-ethyl-2,4-dimethyl-1,3-hexanediol, 1,10-decanediol, Aliphatic diols such as polyethylene glycol and polypropylene glycol; 1,2-cyclohexanedimethanol, , 3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol and other alicyclic diols; 2,2-bis (4-β-hydroxy And ethylene oxide adducts of bisphenol compounds such as ethoxyphenyl) propane and bis (4-β-hydroxyethoxyphenyl) sulfone, and aromatic diols such as xylylene glycol. Only 1 type may be used for the said diol, and 2 or more types may be used for it.
In addition to the above-mentioned components, the polyester-based resin includes oxycarboxylic acids such as p-oxybenzoic acid and p-oxyethoxybenzoic acid; monocarboxylic acids such as benzoic acid and benzoylbenzoic acid; and polyvalent carboxylic acids such as trimellitic acid. It may contain a structural unit derived from an acid; a monohydric alcohol such as polyalkylene glycol monomethyl ether; a polyhydric alcohol such as glycerin, pentaerythritol, or trimethylolpropane.
Further, a modified aromatic polyester-based resin in which at least one of the dicarboxylic acid component and the diol component is composed of two or more components (for example, a component in addition to the main component) may be used.

The polystyrene resin is a polymer composed of a styrene monomer as an essential monomer component. That is, it is a polymer containing at least a structural unit derived from a styrene monomer in the molecule (in one molecule). The polystyrene resin may be a homopolymer or a copolymer. Moreover, only 1 type may be used and 2 or more types may be used.
Examples of the styrene monomer include styrene, α-methyl styrene, m-methyl styrene, p-methyl styrene, p-ethyl styrene, p-isobutyl styrene, pt-butyl styrene, chloromethyl styrene, and the like. Can be mentioned. Of these, styrene is preferable from the viewpoints of availability, material price, and the like. In addition, the said styrene-type monomer may use only 1 type, and may use 2 or more types.
Specific examples of the polystyrene resin include homopolymers of styrene monomers such as general polystyrene (GPPS), which is a styrene homopolymer, and only two or more styrene monomers as monomer components. Examples thereof include copolymers such as copolymers, styrene-diene copolymers, styrene-polymerizable unsaturated carboxylic acid ester copolymers, and HIPS (high impact polystyrene). Of these, styrene-diene copolymers are preferred. The polystyrene resin may be a hydrogenated polystyrene resin (hydrogenated polystyrene resin).
The styrene-diene copolymer is a copolymer composed of styrene monomers and dienes (particularly conjugated dienes) as essential monomer components. The form of copolymerization is not particularly limited, and any of a random copolymer, a block copolymer, and a graft copolymer may be used. The diene is preferably a conjugated diene. For example, 1,3-butadiene, isoprene (2-methyl-1,3-butadiene), 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 1,3 -Hexadiene, chloroprene and the like. Diene may use only 1 type and may use 2 or more types.
Specific examples of the styrene-diene copolymer include styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene / isoprene-styrene block copolymer. Examples include coalescence (SBIS).
Although it does not specifically limit as said hydrogenated polystyrene resin, Hydrogenated styrene-butadiene-styrene block copolymer (SEBS) which added hydrogen to SBS and SIS, or hydrogenated styrene-isoprene-styrene block copolymer (SEPS). ) And the like.

  The thickness of the A layer 21 (before being attached to the battery cell 11) is not particularly limited, but is preferably 0.05 μm to 20 μm, more preferably 0.1 μm to 15 μm, and particularly preferably 0.2 μm to 10 μm. When the laser cut process mentioned later is applied in manufacture of the film-coated article 10, the thickness of the A layer 21 is preferably, for example, 0.05 μm to 5 μm, more preferably 0.08 μm to 4 μm, and 0.1 μm to 3 μm. Particularly preferred. If the thickness of the A layer 21 is within the above range, for example, the mechanical strength of the multilayer film 18 is good, and the durability of the multilayer film 18 (film 12) is improved during production, distribution, use, etc. To do. In addition, good laser cutting properties can be obtained.

[B layer 22]
The B layer 22 has a function of imparting flexibility to the multilayer film 18 and improving extensibility, for example. The resin constituting the B layer 22 preferably has a lower melting point than the resin constituting the A layer 21, and if satisfying this relationship, the polyamide-based resin exemplified as constituting the A layer 21, The polypropylene resin, the polyester resin, the polystyrene resin, and the like can also be used. For example, a case where the A layer 21 is made of a polyamide resin and the B layer 22 is made of a polyamide resin or a polystyrene resin having a melting point lower than that of the polyamide resin can be exemplified.

  A suitable resin constituting the B layer 22 is a polyolefin resin, and the B layer 22 is preferably a resin layer containing a polyolefin resin as a main component. The content of the polyolefin resin in the B layer 22 is preferably 50% by weight or more, more preferably 80% by weight or more, and more preferably 90% by weight or more based on the total weight of the resin components constituting the B layer 22. Particularly preferred.

Specific examples of the polyolefin resin include polyethylene resins such as low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE), polypropylene resins, Copolymer of ethylene and vinyl group-containing monomer, copolymer of propylene and vinyl group-containing monomer, copolymer of 1-butene and vinyl group-containing monomer, copolymer of 2-butene and vinyl group-containing monomer A coalescence etc. can be illustrated. Among these, a copolymer of ethylene and a vinyl group-containing monomer is particularly preferable in order to improve the interlayer strength with the A layer 21. These resins may be used alone or in combination of two or more.
The copolymer of ethylene and a vinyl group-containing monomer may be any of a random copolymer, a graft copolymer, and a block copolymer, but a random copolymer is particularly preferable. Specific examples include maleic anhydride graft-modified linear low density polyethylene (LLDPE-g-MAH), ethylene-vinyl acetate copolymer (EVA), ethylene-methyl methacrylate copolymer (EMMA), ethylene-ethyl. Acrylate copolymer (EEA), ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate-maleic anhydride copolymer (E-EA-MAH), ethylene-acrylic acid copolymer (EAA), ethylene -A methacrylic acid copolymer (EMAA), an ionomer (IO) in which an ion-crosslinked structure is formed by forming a salt of an acid moiety and a metal ion from a copolymer of ethylene and a small amount of acrylic acid or methacrylic acid. . Of these, LLDPE-g-MAH, EMAA, and IO are preferable.
A commercial product may be used for the copolymer of ethylene and a vinyl group-containing monomer. Suitable commercial products include NF536 manufactured by Mitsui Chemicals.

  The B layer 22 is for the purpose of improving the adhesion with other layers, and if necessary, rosin resin, hydrogenated rosin resin, terpene resin, terpene-phenol resin, hydrogenated terpene resin, coumarone. Resins, hydrogenated coumarone resins, petroleum resins, etc .; aromatic hydrocarbon resins; phenolic resins; alicyclic hydrocarbon resins; styrene-acrylic copolymers; natural rubber and synthetic rubber elastomers Etc. may be included.

  The thickness of B layer 22 (before being attached to battery cell 11) is not particularly limited, but is preferably 0.05 μm to 5 μm, more preferably 0.08 μm to 4 μm, and particularly preferably 0.1 μm to 3 μm. Moreover, also when the below-mentioned laser cutting process is applied, the thickness of the B layer 22 is, for example, preferably 0.05 μm to 5 μm, more preferably 0.08 μm to 4 μm, and particularly preferably 0.1 μm to 3 μm. If the thickness of the B layer 22 is within the range, flexibility can be imparted to the multilayer film 18 to improve extensibility, and, for example, good adhesion between the battery cell 11 and the film 12 can be easily obtained. . In addition, good laser cutting properties can be obtained.

  A preferred combination of resins constituting the A layer 21 and the B layer 22 is a combination in which the A layer 21 is a polyamide resin and the B layer 22 is a polyolefin resin, the A layer 21 is a polyester resin, and the B layer 22 is a polyolefin resin. The combination which is is mentioned.

[Inner layer 23]
The inner layer 23 is the innermost layer of the multilayer film 18 as described above. The resin constituting the inner layer 23 may have the same composition as the resin constituting the A layer 21 or the B layer 22, but a different one may be used. The inner layer 23 is made of, for example, a thermoplastic resin such as a polyamide resin, a polyolefin resin (polyethylene resin, polypropylene resin), a polyester resin, a polystyrene resin, or an ethylene-vinyl alcohol copolymer (EVOH). . Specific examples of these resins include resins constituting the A layer 21 or the B layer 22 described above. In addition, when providing the resin layer 19 on the inner layer 23 by printing so that it may mention later, it is preferable to use a polyamide-type resin, a polystyrene-type resin, or a polyester-type resin from the printability, and using a polyamide-type resin especially. preferable.

  The inner layer 23 may be formed on any surface of the A layer 21 and the B layer 22. The thickness of the inner layer 23 is not particularly limited, but is preferably thicker than the A layer 21 and the B layer 22. Specifically, 2 μm to 20 μm is preferable, and 3 μm to 15 μm is more preferable. Moreover, also when the below-mentioned laser cut process is applied, 2 micrometers-15 micrometers are preferable, for example, the thickness of the inner layer 23 is 3 micrometers-12 micrometers, and 5 micrometers-10 micrometers are especially preferable.

[Outer layer 24]
The outer layer 24 is the outermost layer of the multilayer film 18 as described above, and is the outermost layer of the film 12 in this embodiment. The outer layer 24 is made of, for example, a thermoplastic resin such as a polyamide resin, a polyolefin resin (polyethylene resin, polypropylene resin), a polyester resin, a polystyrene resin, or an ethylene-vinyl alcohol copolymer (EVOH). . Specific examples of these resins include resins constituting the A layer 21 or the B layer 22 described above.

  The outer layer 24 may be formed on any surface of the A layer 21 and the B layer 22, but is preferably formed on the B layer 22 from the viewpoint of adhesiveness and the like. The thickness of the outer layer 24 is not particularly limited, but is preferably thicker than the A layer 21 and the B layer 22. Specifically, 2 μm to 40 μm are preferable, 3 μm to 20 μm are more preferable, and 5 μm to 15 μm are particularly preferable. Moreover, also when the below-mentioned laser cut process is applied, 2 micrometers-15 micrometers are preferable, for example, the thickness of the outer layer 24 has more preferable 3 micrometers-12 micrometers, and 5 micrometers-10 micrometers are especially preferable.

  In order to suppress curling of the film 12, it is also preferable that the resin constituting the inner layer 23 and the resin constituting the outer layer 24 have the same composition. In the case of the same composition, it is composed of a polyethylene resin such as LLDPE or EVA, or a polyamide resin. These resins may be used alone or in combination of two or more. However, since the resin layer 19 described later is provided on the film 12, even if the resin constituting the inner layer 23 and the resin constituting the outer layer 24 are different and the film 12 is likely to curl, the function of the resin layer 19 Good adhesion of the film 12 to the surface of the battery cell 11 is obtained, and the film 12 is sufficiently prevented from floating and peeling off. For example, when the inner layer 23 is made of a polyamide-based resin and the outer layer 24 is made of a polyethylene-based resin, the film 12 is easily curled to the outer layer 24 side. The effect suppresses the floating and peeling of the film 12. On the other hand, when the inner layer 23 is made of a polyethylene resin and the outer layer 24 is made of a polyamide resin, if the resin layer 19 is provided on the inner layer 23 by printing, a surface treatment such as a corona treatment is required. . In other words, the resin layer 19 can be printed by performing surface treatment such as corona treatment. According to this configuration, although the surface treatment is required, the film 12 is easily curled toward the battery cell 11, and thus the film 12 can be easily prevented from being lifted or peeled off.

  In addition, in each layer which comprises the inner layer 23, the outer layer 24, and the base layer part 20, the kind and quantity of the said additive to contain may differ. For example, only the inner layer 23 and the outer layer 24 may contain an antistatic agent or a lubricant.

[Resin layer 19]
As described above, the resin layer 19 is the innermost layer of the film 12 that contacts the surface of the battery cell 11 and is a resin layer mainly composed of a polycarbonate-based urethane resin. By providing the resin layer 19 mainly composed of a polycarbonate-based urethane resin as the innermost layer of the film 12, the adhesion of the film 12 to the surface of the battery cell 11 is improved, and the film 12 does not easily float. Here, the “main component” means a component having the largest content among the constituent materials of the resin layer 19. The content of the polycarbonate urethane resin is preferably 50% by weight or more with respect to the total weight of the resin layer 19, more preferably 70% by weight or more, and particularly preferably 80% by weight or more. The resin layer 19 may be composed of only a polycarbonate-based urethane resin (100% by weight).

  The polycarbonate urethane resin constituting the resin layer 19 is a reaction product of a polycarbonate polyol component and a polyisocyanate component. The polycarbonate-based urethane resin may contain a polyol component other than the polycarbonate polyol, a chain extension component, an anionic, a cationic, or a nonionic hydrophilic group. The molar ratio of the polycarbonate polyol component and the polyisocyanate component is, for example, 30:70 to 70:30. For example, the polycarbonate urethane resin has a glass transition temperature (Tg) in the range of −50 ° C. to −10 ° C. and a Vicat softening temperature in the range of 70 ° C. to 120 ° C. The Vicat softening temperature can be measured according to JIS K 7206.

  The polycarbonate polyol component is preferably a reaction product of a diol component and a carbonate component. Examples of the diol component include ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, Examples include 1,9-nonanediol, 1,8-nonanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, bisphenol-A and the like. Examples of the carbonate component include dimethyl carbonate, diphenyl carbonate, ethylene carbonate, phosgene and the like. These may be used alone or in combination of two or more.

  The polyisocyanate component includes aromatic diisocyanates such as tolylene diisocyanate and diphenylmethane diisocyanate, aromatic aliphatic diisocyanates such as xylylene diisocyanate, isophorone diisocyanate, 4,4-dicyclohexylmethane diisocyanate, and 1,3-cyclohexanebismethyl isocyanate. Examples thereof include aliphatic diisocyanates such as alicyclic diisocyanate, hexamethylene diisocyanate, and 2,2,4-trimethylhexamethylene diisocyanate. These may be used alone or in combination of two or more.

  Examples of the chain extension component include diamines such as ethylenediamine, propylenediamine, hexamethylenediamine, and isophoronediamine, and amino alcohols such as ethanolamine, diethanolamine, 2-amino-2-methylpropanol, and triethanolamine. The hydrophilic group is preferably a carboxylate type (anionic), for example, a resin skeleton using 2,2-dimethylolpropionic acid, 2,2-dimethylolbutanoic acid, 2,2-dimethylolheptanoic acid, or the like. It is formed by introducing a carboxyl group into and neutralizing it.

  The resin layer 19 may contain additives such as resin components and pigments other than the polycarbonate urethane resin. The resin component other than the polycarbonate-based urethane resin is not particularly limited as long as it can form the resin layer 19 together with the urethane resin. For example, the same polyamide-based resin and polyolefin-based resin as the resin constituting the multilayer film 18 , Polyester resins, polystyrene resins, and ethylene-vinyl alcohol copolymers (EVOH). However, the resin component constituting the resin layer 19 is preferably 80% by weight or more of polycarbonate-based urethane resin, and particularly preferably only polycarbonate-based urethane resin. Moreover, when a pigment is contained in the resin layer 19, the content of the pigment with respect to the total weight of the resin layer 19 is preferably less than 20% by weight, and particularly preferably less than 10% by weight.

  The resin layer 19 is, for example, a printed layer formed by printing on the inner layer 23 a urethane water-based ink mainly composed of a polycarbonate urethane emulsion. In this case, the polycarbonate urethane resin constituting the resin layer 19 is dispersed in an aqueous medium mainly composed of water, an aqueous solvent such as alcohol, or a mixture thereof to form an emulsion. The polycarbonate-based urethane emulsion may be a forced emulsification type using a surfactant as an emulsifier, but preferably a self-emulsification that does not require a surfactant by introducing a hydrophilic group such as a carboxylate into the urethane resin. It is a type. The urethane-based water-based ink used for printing the resin layer 19 may contain additional aqueous solvent or surfactant as required in addition to the polycarbonate-based urethane resin and the aqueous medium constituting the polycarbonate-based urethane emulsion. In addition, various additives (for example, thickeners, antifoaming agents, preservatives, pH adjusting agents, coloring agents, chain extenders, cross-linking agents, etc.) may be included.

  A commercially available product can be used for the polycarbonate-based urethane resin (polycarbonate-based urethane emulsion) constituting the resin layer 19. Examples of the commercially available products include permarine series and ucoat series manufactured by Sanyo Chemical Industries.

  The thickness of the resin layer 19 is not particularly limited, but is preferably 0.05 μm to 5 μm, more preferably 0.08 μm to 4 μm, and particularly preferably 0.1 μm to 3 μm.

  FIG. 6 schematically shows another example of the laminated structure of the film 12. Examples of the film 12 shown in this example include the film described in JP2013-111822A.

  The example shown in FIG. 6 is common to the example shown in FIG. 5 in that the multilayer film 18 has a base layer part 20, an inner layer 23, and an outer layer 24 formed by laminating a plurality of multilayer parts 28 adjacent to each other. 5 is different from the example shown in FIG. 5 in that the adhesive layers 25 and 26 and the core layer 27 are provided. In the example shown in FIG. 6, two base layer portions 20 are provided on both sides of the core layer 27. The film 12 includes three or more multilayer portions 28 in the base layer portion 20, but when two base layer portions 20 are provided as described above, the film 12 includes three or more multilayer portions 28 as a whole. Just go out. As for the number of the multilayer parts 28 in each base layer part 20, 2-15 are more preferable, and 3-10 are especially preferable. The number of the multilayer portions 28 in each base layer portion 20 may be the same as or different from each other.

[Adhesive layer 25]
The adhesive layer 25 improves, for example, the adhesive strength between the inner layer 23 and the base layer portion 20 (for example, the B layer 22). As a material constituting the adhesive layer 25, a conventionally known adhesive resin such as an adhesive polyolefin resin is used. Specific examples include ethylene-methacrylate-glycidyl acrylate terpolymers, various polyolefins grafted with monobasic unsaturated fatty acids, dibasic unsaturated fatty acids, or anhydrides thereof (maleic acid grafted ethylene). -Vinyl acetate copolymer, maleic acid grafted ethylene-α-olefin copolymer, etc.). As the monobasic unsaturated fatty acid, acrylic acid, methacrylic acid or the like is used. As the dibasic unsaturated fatty acid, maleic acid, fumaric acid, itaconic acid or the like is used. Further, the adhesive layer 25 may be formed using the same resin as that constituting the B layer 22.

  The thickness of the adhesive layer 25 is not particularly limited, but is preferably thicker than the A layer 21 and the B layer 22. Specifically, it is preferably 2 μm to 70 μm, more preferably 3 μm to 60 μm. Moreover, also when the below-mentioned laser cut process is applied, 2 micrometers-15 micrometers are preferable, for example, and the thickness of the contact bonding layer 25 has more preferable 3 micrometers-12 micrometers. If the thickness of the adhesive layer 25 is within the range, the multilayer film 18 having good adhesive strength can be obtained at a relatively low cost.

[Adhesive layer 26]
The adhesive layer 26 improves, for example, the adhesive strength between the outer layer 24 and the base layer portion 20. The material constituting the adhesive layer 26 can be appropriately changed according to the resin constituting the outer layer 24. For example, the same material as that constituting the adhesive layer 25 can be used.

  The thickness of the adhesive layer 26 is not particularly limited, but is preferably thicker than the A layer 21 and the B layer 22. Specifically, it is preferably 2 μm to 50 μm, more preferably 3 μm to 40 μm. Moreover, also when the below-mentioned laser cut process is applied, 2 micrometers-15 micrometers are preferable, for example, and the thickness of the contact bonding layer 26 has more preferable 3 micrometers-12 micrometers. If the thickness of the adhesive layer 26 is within the range, a multilayer film having good adhesive strength can be obtained at a relatively low cost.

[Core layer 27]
The core layer 27 is appropriately selected according to the use of the film 12 and the like. For example, when the film 12 requires barrier properties, a barrier layer is provided. When heat resistance is required, a heat resistant barrier layer is provided. An example of the core layer 27 is an oxygen barrier layer having oxygen barrier properties. As a material constituting the oxygen barrier layer, for example, polyvinyl alcohol, EVOH, vinylidene chloride resin, polyamide-based resin having an aromatic ring as a diamine component, or the like is used. Among these, EVOH is preferable. Although the ethylene copolymerization ratio of EVOH is not specifically limited, 20 mol%-50 mol% are preferable, 30 mol%-40 mol% are more preferable, 30 mol%-35 mol% are especially preferable.

  Examples of the resin constituting the core layer 27 include a copolymer of ethylene and a vinyl group-containing monomer, a copolymer of propylene and a vinyl group-containing monomer, a copolymer of 1-butene and a vinyl group-containing monomer, 2- A copolymer of butene and a vinyl group-containing monomer may be used. Further, resins having the same composition (substantially the same) may be used for the A layer 21 or the B layer 22 and the core layer 27. For example, when the A layer 21 is made of a polyamide resin, the core layer 27 may be made of the same polyamide resin (the same product). The core layer 27 may have a plurality of resin layers.

  The thickness of the core layer 27 is not particularly limited, but specifically, 1 μm to 30 μm is preferable, and 2 μm to 25 μm is more preferable. Moreover, also when the below-mentioned laser cut process is applied, 1 micrometers-15 micrometers are preferable, for example, and the thickness of the core layer 27 has more preferable 2 micrometers-12 micrometers.

[Method for Producing Film 12 (Multilayer Film 18)]
The film 12 having the above layer structure can be produced by a conventional method such as melt film formation. Among these, the melt film forming method (particularly, the T-die method) is preferable. As a lamination method, for example, a co-extrusion method (feed block method, multi-manifold method, etc.), a dry lamination method, or the like can be used. Among these, the coextrusion method is preferable, and the feed block method is preferable.

  Furthermore, the base layer portion 20 can be multilayered by using a layer multiplier, or by combining a feed block and a layer multiplier (hereinafter referred to as “multiplier”). A multiplier is an apparatus that multi-layers film layers. The method of multilayering the film layer with a multiplier is not particularly limited, and examples thereof include a method of dividing the film layer in the width direction and then laminating the divided film layer in the thickness direction.

Here, an example of the coextrusion method (feed block method) will be described.
First, a raw material for forming the base layer portion 20 and a raw material for forming the surface layer are respectively charged into a plurality of extruders each set to a predetermined temperature and melted (or melt-kneaded), and then the molten raw material is T-die. The raw material (a) constituting the melted A layer 21 and the raw material (b) constituting the B layer 22 are laminated, and the A layer 21 and the B layer 22 are alternately laminated. The base layer portion 20 is prepared. That is, the base layer part 20 in which a plurality of multilayer parts 28 are stacked adjacent to each other is produced. The laminated structure of the base layer portion 20 can be formed using only a feed block, or can be formed using a combination of a feed block and a multiplier. If necessary, the supply amount of the raw material may be adjusted with a gear pump, or foreign matter may be removed using a filter. In addition, although extrusion temperature changes also with the kind of raw material to be used and is not specifically limited, 150 to 250 degreeC is preferable. Further, for example, the raw material (e) constituting the molten core layer 27 is extruded using a feed block, and the molten raw material (a) and the raw material (b) are pushed from both sides of the raw material (e). By taking out, the base layer part 20 in which the A layer 21 and the B layer 22 are alternately laminated on both sides of the core layer 27 can also be formed. An unstretched multilayer film (unstretched multilayer film) can be obtained by quenching the coextruded polymer using a cooling drum or the like.

  Further, by coextruding the raw material (c) constituting the inner layer 23 and the raw material (d) constituting the outer layer 24 simultaneously with the above raw materials (a) and (b) (optionally the raw material (e)), or By laminating the film constituting the inner layer 23 and the film constituting the outer layer 24 and the unstretched multilayer film including the base layer portion 20 obtained as described above by a conventional laminating method (dry laminating method) or the like, the multilayer film 18 can be manufactured.

  The film 12 is obtained by forming a resin layer 19 on one surface of the multilayer film 18. The surface of the film 12 on which the resin layer 19 is formed is the innermost surface that contacts the surface of the battery cell 11. The resin layer 19 may be formed using a coextrusion method, a dry lamination method, or the like, as in the case of forming the layer structure of the multilayer film 18. However, from the viewpoint of productivity and the like, it is preferable to form the resin layer 19 using the urethane-based ink whose main component is a polycarbonate-based urethane emulsion. For printing the resin layer 19, a conventionally known printing machine such as a gravure printing machine, a flexographic printing machine, a letterpress printing machine or the like can be used.

  Since the surface of the battery cell 11 except the upper surface 13a of the electrode terminal 13 is covered with the film 12, the film-covered article 10 having the above configuration can protect the surface of the battery cell 11 from scratches and the like. In addition, waterproofness and insulation are ensured. In particular, since the thickness of the film 12 on the bottom surface 11b is the largest, there is an advantage that it is resistant to rubbing with the surface on which the film-coated article 10 is placed. Furthermore, since the thickness of the film 12 is relatively thicker on the bottom surface 11b side than on the top surface 11a side, it is possible to effectively protect the lower part of the battery cell 11 that is particularly vulnerable, and the installation location is Even if it is submerged, high waterproof performance is demonstrated. On the other hand, although the upper surface 11a side of the battery cell 11 is a deaeration port and is also an opening end of the film 12, the upper surface 11a side of the film 12 is in a state of being greatly stretched compared to the bottom surface 11b side, It strongly adheres to the surface of the battery cell 11. Therefore, the film 12 is also prevented from peeling off from the open end. In addition, since the upper surface 13a of the electrode terminal 13 is exposed, the connection work with other members is also easy.

  Further, according to the film-coated article 10, it is possible to suppress the occurrence of a bridge on the side surface (hereinafter sometimes referred to as “side bridge”) and obtain a packaging form having a good appearance. Although the side surface 11c thru | or the side surface 11d of the battery cell 11 or the side surface corner | angular part where the side surface 11c and the side surface 11d are connected, a bridge | bridging generate | occur | produces and it is easy to deteriorate in appearance (refer FIG. 17 mentioned later), In such a case, the multilayer film 18 is stretched satisfactorily, and the occurrence of side bridges in the portion is suppressed.

  In addition, by providing the resin layer 19 mainly composed of polycarbonate urethane resin as the innermost layer in contact with the surface of the battery cell 11, the adhesion of the film 12 to the surface of the battery cell 11 is further improved. Floating and peeling are further suppressed. And the favorable adhesion state of the film 12 with respect to the surface of the battery cell 11 can be maintained for a long time. On the other hand, since the film 12 is not completely bonded to the surface of the battery cell 11, it is easy to leave the resin component on the surface of the battery cell 11 when the film 12 needs to be peeled off. Can be peeled off. Furthermore, the film 12 is fixed by forming the inner surface contact portion 29 on the upper surface of the film-coated article 10, and the peeling of the film 12 is further suppressed. In addition, when the temperature of the film heated in the manufacturing process of the film-coated article returns to room temperature, the film floats from the battery surface and an air layer is easily formed between the battery and the film. When a large air layer is formed, the cooling performance of the battery deteriorates, and problems such as wrinkling of the film occur when modularized. However, according to the film-coated article 10, the formation of a large air layer can be prevented. , Can solve such problems.

  Hereinafter, the film-coated article 50 as another example of the embodiment will be described with reference to FIGS. 9-12 is a figure for demonstrating an example of the manufacturing process of the film-coated article 50. FIG.

A film-coated article 50 is shown in FIGS.
Similar to the film-coated article 10, the film-coated article 50 includes a battery cell 11 and a film 51 that covers the surface of the battery cell 11. On the other hand, the film-coated article 50 is different from the film-coated article 10 in which the electrode terminal 13 and its periphery are exposed without being covered with the film 51 and are covered with the film 12 up to the side surface of the electrode terminal 13. The film 51 is in close contact with the entire bottom surface 11b and the four side surfaces 11c and 11d of the battery cell 11 and the peripheral edge of the top surface 11a. Note that the multilayer film 18 and the resin layer 19 similar to the film 12 are applied to the film 51.

FIG. 9 is a diagram showing the battery cell 11 to which the pedestal 52 is attached.
The battery cell 11 is preferably covered with the film 51 with the pedestal 52 attached. The base 52 is attached to the upper surface 11a of the battery cell 11, for example, and has a hole into which the electrode terminal 13 can be inserted. The pedestal 52 is removed after a third step, which will be described later. In the second step, which will be described later, the film 51 is also attached to the side surface of the pedestal 52. Hereinafter, the battery cell 11 to which the pedestal 52 is attached is referred to as “battery cell 11z”.

  The height of the pedestal 52 is preferably equal to or higher than the height of the electrode terminal 13. In the example shown in FIG. 9, the upper surface of the electrode terminal 13 and the upper surface of the base 52 are substantially flush. The first and second steps described later are performed by placing the battery cell 11z on the support base 100 with the upper surface 11a of the battery cell 11 to which the base 52 is attached facing downward. As a result, the stability of the battery cell 11z is improved. In addition, since the electrode terminal 13 is covered with the pedestal 52, the film 51 can be prevented from coming into close contact with the electrode terminal 13.

  The pedestal 52 has, for example, a substantially rectangular parallelepiped shape and covers the electrode terminal 13 and is attached to the upper surface 11a. In the present embodiment, the lengths of the long side and the short side of the top surface and the bottom surface of the pedestal 52 are shorter than the short side length X and the long side length Y of the battery cell 11, respectively. That is, the battery cell 11z has a portion in which the external dimension changes sharply along the vertical direction (height direction). The pedestal 52 constituting the battery cell 11z has a shorter outer peripheral length in the lateral direction than the battery cell 11, and a step is formed at the boundary between the pedestal 52 and the battery cell 11 due to the difference in the outer peripheral length between the battery cell 11 and the pedestal 52. It is formed.

FIG. 10 is a block diagram illustrating a manufacturing process of the film-coated article 50.
The manufacturing process of the film-coated article 50 includes the following processes.
(1) A heating and softening step, which is a first step of heating and softening the film 51 and covering the battery cell 11z with the film.
(2) Degassing between the battery cell 11z and the film 51 from one side of the battery cell 11z in a state where the main film adhesion holding surface of the battery cell 11z is positioned laterally with respect to the deaeration direction, A degassing step, which is a second step of bringing the film 51 into close contact with the surface of the battery cell 11z.
It is preferable that the manufacturing process of the film-coated article 50 further includes the following processes.
(3) The laser cut process which is the 3rd process of irradiating the laser beam (alpha) to the film 51 which coat | covered the battery cell 11z, and cut | disconnecting the said film.
In the present embodiment, a rough cutting process is provided between the second process and the third process.

  FIG. 11 is a diagram illustrating a heat softening process to a rough cutting process. FIGS. 11A to 11C show a heat softening process (first process), FIG. 11D shows a degassing process (second process), and FIG. 11E shows a rough cutting process. In the following, a form in which the battery cell 11z is covered with the long film 51 is “film-coated article 50x”, and a form in which the long film 51 is circularly cut around each film-coated article 50x is formed. This is “film-coated article 50y”.

  As shown in FIGS. 11A to 11C, in the first step (heating softening step), the film 51 is heated using the heater 101, and the film 51 softened by the heating is relatively replaced by the battery cell 11z. It is made to approach and is covered from the battery cell 11z. In the example shown in FIG. 11, the battery cell 11z is placed on the support table 100 with the pedestal 52 (electrode terminal 13) facing down and the bottom surface 11b facing up, and is placed on the support table 100, and the bottom surface 11b of the battery cell 11z. A long film 51 softened by heating is placed on the top. The support base 100 has a suction hole 102. In the first step, the film 51 may be lowered, the battery cell 11z may be raised, or the battery cell 11z may be raised while the film 51 is lowered. In any case, the film 51 is first brought into contact with the bottom surface 11b of the battery cell 11 by bringing the film 51 relatively closer to the battery cell 11z.

  In the example shown in FIG. 11B, the support base 100 on which the battery cell 11z is placed is raised, and the press frame 103 is lowered to push down the film 51. The presser frame 103 is disposed so as to surround the four sides of the battery cell 11z, and the film 51 is sandwiched between the presser frame 103 and the support base 100, and the film 51 is put on the battery cell 11z to cover the bottom surface 11b of the battery cell 11. (Refer to FIG. 11C).

  As shown in FIG. 11 (d), in the second step (deaeration step), the battery cell is drawn from the pedestal 52 side, which is one side of the battery cell 11z, by sucking air from the suction hole 102 of the support base 100. The space between 11z and the film 51 is deaerated, and the softened film 51 is brought into close contact with the surface of the battery cell 11z. When deaeration is performed with the softened film 51 in contact with the bottom surface 11b of the battery cell 11, the film 51 is stretched downward from the bottom surface 11b of the battery cell 11. At this time, the side surface 11d of the battery cell 11 which is the main film adhesion holding surface is located laterally with respect to the deaeration direction. When the film 51 is difficult to be stretched, it may be stretched and adhered while being heated from the side surface.

  By the deaeration step, the film 51 is stretched to a deep drawing state, and in close contact with the side surfaces 11c and 11d of the battery cell 11, smoothly flows from the side surfaces 11c and 11d of the battery cell 11 to the upper surface 11a. It also adheres to the side. That is, the film 51 is in close contact with the battery cell 11 and the pedestal 52 having a shorter outer peripheral length than the battery cell 11. When the dimensional difference between the battery cell 11 and the pedestal 52 is large, the portion of the film 51 that is in close contact with the pedestal 52 is significantly narrower than the portion of the film 51 that is in close contact with the battery cell 11. For this reason, a bridge 55 (see FIG. 12) may be formed at a portion that is in close contact with the pedestal 52. However, the bridge 55 is not formed in the portion covering the side surfaces 11c and 11d of the battery cell 11, but is a kind of the inner surface contact portion 29 formed in the portion covering the upper surface 11a, and thus has a function of fixing the film 51. In addition, peeling of the film 51 is further suppressed. Hereinafter, the bridge formed on the upper surface of the film-coated article (the portion covering the upper surface of the battery cell) may be referred to as the “upper surface bridge” to be distinguished from the side bridge.

  Since the film 51 is stretched toward the pedestal 52 side and in close contact with the side surfaces 11c and 11d of the battery cell 11 and the side surface of the pedestal 52 in a stretched state, the film 51 is closer to the side surface 11c than the thickness at the bottom surface 11b of the battery cell 11. , 11d and the thickness of the side surface of the pedestal 52 are reduced. The thickness of the film 51 is, for example, about 70% to 98% at the portion covering the bottom surface 11b and about 20% to 65% at the portion covering the side surfaces 11c and 11d as compared to before degassing. That is, since the film 51 is in close contact with the side surfaces 11c, 11d and the like in a greatly stretched state, high adhesion can be obtained. On the other hand, since the thickness of the film 51 on the bottom surface 11b is thicker than the thickness on the side surfaces 11c and 11d and the side surface of the pedestal 52, high durability against external contact is obtained.

  As shown in FIG.11 (e), the rough cut process which cut | disconnects the elongate film 51 in the vicinity of the battery cell 11z is provided after the 2nd process. In this step, the cut lines 53 are formed around the plurality of film-coated articles 50x connected by the long film 51 to form the film-coated articles 50y separated from each other. Since the cut line 53 is not formed in a portion that is in close contact with the battery cell 11z, it is preferable to form the cut line 53 using a blade 104 such as a Thomson blade from the viewpoint of productivity. However, it is also possible to form the cut line 53 by irradiation with the laser beam α. In the film-coated article 50y, there is an excess portion 54 of the film 51 around the pedestal 52. The film-coated article 50y is conveyed to a place where laser cutting is performed using, for example, a robot arm.

FIG. 12 is a diagram showing a laser cutting step (third step).
In the third step, the roughly cut film 51 is irradiated with the laser beam α to cut the film at a desired position, and the surplus portion 54 of the film 51 is cut off. In the present embodiment, the laser light α is irradiated to a range in close contact with the side surface of the pedestal 52. The laser beam α is continuously irradiated in the lateral direction along each side surface of the pedestal 52. By irradiating the laser beam α around the pedestal 52 in a ring shape, the film 51 is cut at a portion irradiated with the laser beam α, and a portion located above the irradiated portion of the laser beam α is cut as an excess portion 54. Is done. The laser beam α is irradiated by relatively moving the irradiation spot of the laser beam α and the battery cell 11z. For example, the laser beam α may be scanned, or the battery cell 11z side may be scanned using a robot arm or the like. You may move.

  When the film 51 is irradiated with the laser beam α, the laser beam α is absorbed by the film 51 and heat is generated in the irradiated portion, whereby the film 51 is melted and cut. In the case of the film 51, the laser light α is hardly absorbed by the B layer 22 mainly composed of polyolefin resin, but the laser light α is absorbed by the A layer 21, so that heat is generated at the irradiated portion of the laser light α. Then, the heat is transmitted to the B layer 22 and the film 51 is cut.

  It is preferable to irradiate the laser beam α to the portion where the film 51 is stretched and thinned by the degassing step. In particular, it is preferable to irradiate the thin portion where the thickness of the film 51 is 20% or more thinner than before degassing with the laser beam α. Specifically, the laser beam α is irradiated to the vicinity of the deaeration opening where the film 51 is greatly stretched and thinned, for example, the portion that is in close contact with the pedestal 52.

  As described above, the bridge 55 that is the upper surface bridge may be formed on the portion of the film 51 that is in close contact with the pedestal 52. Since the upper surface bridge has an effect of suppressing peeling of the film 51, it is preferable that the upper surface bridge is formed at least at a part of the upper surface. However, there is a problem that it is difficult to cut the film 51 at that part. However, by applying the laser cutting process, the film 51 can be easily cut even at the portion where the upper surface bridge is formed, and the excess portion 54 can be cut off.

  In the third step, a conventionally known laser device used for laser cutting of a resin film can be used. Suitable laser devices include a CO2 laser (wavelength 9.3 μm or wavelength 10.6 μm), a YAG laser (1064 nm) and a YVO4 laser (1064 nm). The laser apparatus may be either a pulse oscillation system or a continuous oscillation system, and conditions such as laser output and irradiation time can be appropriately set in consideration of cut appropriateness and the like.

FIG. 13 shows a battery module 110 using the film-coated article 50.
As illustrated in FIG. 13, the battery module 110 includes a film-covered article 50 that is a film-coated battery in which square battery cells 11 are covered with a film 12, an insulating spacer 111, and a pair of end plates 112. . The battery block 113 is configured by alternately laminating the film-coated article 50 and the spacer 111 along the short side direction of the battery cell 11, and the end plates 112 are disposed at both ends of the battery block 113. A fastening member (not shown) is installed between the pair of end plates 112, whereby the film-coated articles 50 and the spacers 111 constituting the battery block 113 are bound.

  In the battery module 110, the film-coated articles 50 are arranged so that the electrode terminals 13 of the battery cells 11 face the same direction. Further, the adjacent film-coated articles 50 are laminated with their directions changed by 180 ° so that the + -side electrode terminals 13 and the −-side electrode terminals 13 are alternately arranged in a straight line along the lamination direction of the film-coated articles 50. ing. Then, the positive electrode terminal 13 and the negative electrode terminal 13 of the adjacent film-coated articles 50 are connected to each other through, for example, a bus bar (not shown). The battery module 110 includes a case that houses the battery block 113, for example.

  As described above, the film-coated article 50 constituting the battery module 110 does not have a side bridge, and in particular, a polycarbonate urethane resin having good adhesion to the aluminum metal that is the exterior of the battery cell 11 is the resin layer 19. Since it is provided, the adhesion of the film 12 to the surface of the battery cell 11 is good, and an air layer is hardly formed between them. By using the film-coated article 50, it is possible to prevent problems that occur due to side bridges, for example, problems such as a decrease in insulation and thermal conductivity, and failure to accommodate in a specified space when modularized. In addition, when a large air layer is formed between the battery and the film, the battery layer may function as a heat insulating layer when the battery generates heat due to charge / discharge, and heat is trapped, so that the battery performance may be deteriorated. In the case of the film-coated article 50, since the air layer is hardly formed, the heat dissipation of the battery cell 11 is improved, and the battery performance can be sufficiently exhibited. Moreover, when the temperature control apparatus which cools or heats the battery cell 11 is provided, controllability of battery temperature improves by using the film-coated article 50. Furthermore, according to the film-coated article 50, moisture hardly enters between the battery cell 11 and the film 12, and good waterproof performance and insulation performance can be ensured. The battery module 110 having such characteristics is suitable for an in-vehicle power source such as an electric vehicle and a hybrid vehicle.

FIG. 14 shows a film-coated article 70y which is another example of the embodiment.
FIG. 14 shows a film-coated article 70y in a state where a pedestal 73 is attached to the battery cell 71. The battery cell 71 constituting the film-coated article 70y has a rectangular shape like the battery cell 11 and has an upper surface 71a, a bottom surface 71b, and four side surfaces 71c and 71d, but is thinner than the battery cell 11, for example, The length X (thickness) of the short side is 1 mm to 5 mm. The relationship between the short side length X, the long side length Y, and the height Z of the battery cell 71 is X <Y <Z. That is, the side surface 71d, the side surface 71c, the top surface 71a, and the bottom surface 71b are arranged in descending order of area. Applications of the battery cell 71 include small and thin power supplies for electronic devices such as mobile phones, tablets, and digital cameras. Electrode terminals (not shown) are provided on the upper surface 71a and the bottom surface 71b, for example. The film 72 covering the battery cell 71 includes the multilayer film 18 and the resin layer 19 similar to the film 12.

  In the film-coated article 70y, the film 72 is in close contact with the entire four side surfaces 71c and 71d and the bottom surface 71b of the battery cell 71. Since the electrode terminal is provided on the bottom surface 71b, for example, a part of the portion covering the bottom surface 71b of the film 72 is cut out in a later step to expose the electrode terminal. In the example shown in FIG. 14, the pedestal 73 is attached to the upper surface 71 a, and the side surface of the pedestal 73 is also covered with the film 72. The film-coated article 70y is, for example, a battery cell 71 with a pedestal 73 attached thereon placed on a support base 100, and a heated film 72 covered from the bottom surface 71b side of the battery cell 71, and the battery cell 71 and film from the top surface 71a side. It is obtained by deaerating between 72.

  The pedestal 73 shown in FIG. 14 is a columnar member whose upper end and lower end are flat and whose upper end area is smaller than the area of the upper surface 71 a of the battery cell 71. The pedestal 73 is attached to the upper surface 71 a so that the upper end portion thereof does not protrude from the upper surface 71 a of the battery cell 71. A step is formed at the boundary between the battery cell 71 and the pedestal 73 due to the difference in the outer peripheral lengths. The pedestal 73 extends long in the vertical direction (height direction), and the height is preferably 25% or more of the vertical length of the battery cell 71. The area of the lower end portion of the pedestal 73 is larger than the area of the upper end portion, and the thickness of the columnar pedestal 73 gradually increases from the top to the bottom (the peripheral length of the side surface gradually increases). In the case of an article having a small thickness such as the battery cell 71, the side bridge is more easily formed than in the case of the battery cell 11, and for example, the side bridge is easily formed in a portion that is in close contact with the side surface 71 c of the film 12. However, in the film-coated article 70y, by using the pedestal 73 having a high height, the bridge 74 is formed in a portion that is in close contact with the pedestal 73, and the side bridge is not formed. As shown in FIG. 15, when a pedestal 75 having a low height is used, a bridge 76 that is a side bridge is easily formed.

  By cutting the film 72 with a laser beam α or the like at the portion that is in close contact with the side surface of the pedestal 73 and removing the pedestal 73, for example, the film 72 is in close contact with the peripheral portion of the upper surface 71a, and the electrode terminals on the upper surface 71a Exposed. At this time, the film 72 is cut at a portion where the bridge 74 is formed, but the film 72 can be easily cut by applying laser cut. Since the bridge 74 that is the upper surface bridge is a kind of the inner surface close contact portion 29, it has a function of fixing the film 72 and further suppresses peeling of the film 72.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further, this invention is not limited to these Examples.

<Example 1>
As the multilayer film, a multilayer film (total thickness: 100 μm) prepared according to the method described in JP 2013-111822 A was used. A resin layer composed of a polycarbonate urethane resin is a gravure-printed urethane-based water-based ink based on a polycarbonate urethane emulsion (manufactured by Sanyo Chemical Industries, Permarin UA-368) on the inner layer of a multilayer film, and then dried. Formed. The layer structure of the film including the multilayer film and the resin layer, the composition of each layer, and the like are as follows.
Layer structure: resin layer / inner layer / adhesive layer 1 / base layer part 1 / core layer / base layer part 2 / adhesive layer 2 / outer layer Resin layer (2.0 μm): polycarbonate urethane resin Inner layer (13.0 μm): polyamide resin (Manufactured by Ube Industries, 1030B)
Adhesive layer 1 (20.0 μm): polyethylene resin (manufactured by Mitsui Chemicals, NF536)
Base layer part 1: Polyamide resin (A layer: 4.0 μm, manufactured by Ube Industries, 1030B), polyethylene resin (B layer: 2.0 μm, manufactured by Mitsui Chemicals, NF536), A layer / B layer alternately in total 8 layers (including 4 adjacent stacked layers)
Core layer (4.0 μm): polyamide resin (manufactured by Ube Industries, 1030B)
Base layer part 2: Polyethylene resin (B layer: 2.0 μm, Mitsui Chemicals, NF536), polyamide resin (A layer: 4.0 μm, Ube Industries, 1030B), B layer / A layer alternately in total 8 layers (including 4 adjacent stacked layers)
Adhesive layer 2 (6.0 μm): polyethylene resin (manufactured by Mitsui Chemicals, NF536)
Outer layer (9.0 μm): LLDPE (Ube Industries, 1520F)

  An aluminum block having a substantially rectangular shape (150 mm × 100 mm × 25 mm) was used as the article. The block has an upper surface and a lower surface, and four side surfaces. The upper surface and the lower surface have a short side and a long side, and the four side surfaces include a side surface on the short side and a side surface on the long side. In order of increasing area, there are a long side surface, an upper surface and a lower surface, and a short side surface.

The film-coated article A1 was produced as follows.
First, the multilayer film softened by heating is placed on the upper surface of the block. Subsequently, the air between the block and the multilayer film is deaerated by sucking from the lower surface side of the block covered with the multilayer film. As a result, the film-coated article A1 is obtained in which the multilayer film is stretched and is in close contact with the entire side surface and lower surface of the block. In the degassing step, the side surface on the long side was positioned laterally with respect to the degassing direction. In addition, a present Example and a comparative example verify the presence or absence of the side bridge | bridging and the film floating, and coat | covered the multilayer film so that the whole said block might be covered.

  FIG. 16 is a photograph of the appearance of the film-coated article A1. This photograph was taken near the corner on the degassing side, which is a portion where side bridges are likely to occur. As can be clearly understood from this photograph, in the film-coated article A1, the side bridge is not formed at all even in the vicinity of the degassing corner, and the film is in good contact, realizing a beautiful packaging form. . Furthermore, when the film was cut from the degassing side edge of the film along the side surface on the short side, and the state of the film was confirmed, the film was not lifted, and the film was kept in close contact with the surface of the block It was done.

<Comparative Example 1>
A film-coated article X1 was produced in the same manner as in Example 1 except that a three-layer film (trade name: ZPX111, total thickness: 100 μm) manufactured by Tamapoly Co., Ltd. was used as the multilayer film. The layer structure of the film used in Comparative Example 1 is as follows.
Layer structure: Resin layer / Inner layer / Center layer / Outer layer Resin layer: Polycarbonate urethane resin (2.0 μm)
Inner layer: Polyethylene resin (42.5 μm)
Center layer: Polyamide resin (15μm)
Outer layer: Polyethylene resin (42.5μm)

  FIG. 17 is a photograph of the appearance of the film-coated article X1. This photograph was taken in the vicinity of the degassing corner, which is a portion where side bridges are likely to occur, as in FIG. As can be clearly understood from this photograph, in the film-coated article X1, a large side bridge was formed in the vicinity of the corner on the deaeration side, resulting in a packaging form having a poor appearance as compared with the film-coated article A1.

<Comparative example 2>
A film-coated article X1 was produced in the same manner as in Example 1 except that the multilayer film of Example 1 having no resin layer was used as the film. In the film-coated article X1, although the film was in close contact, the film floated near the upper surface of the block, and an air layer was confirmed between the block and the film.

  As described above, in the film-coated article X1 of Comparative Example 1, side bridges occurred, and in the film-coated article X1 of Comparative Example 2, film floating occurred. On the other hand, in the film-coated article A1 of Example 1, the side bridge is not generated, the film adheres well in the vicinity of the degassing corner, and the film is not lifted up. A beautiful packaging form with almost no air layer between them can be realized.

<Example 2>
A film-coated article A2 was produced in the same manner as in Example 1 except that the material for the core layer of the multilayer film was changed from polyamide resin to EVOH resin (manufactured by Kuraray, J171B). Similarly to the film-coated article A1, the film-coated article A2 was not confirmed to have side bridges and film lift, and realized a beautiful packaging form.

<Comparative Example 3>
A film-coated article X2 was produced in the same manner as in Example 1 except that the material of the resin layer of the film was changed from the polycarbonate urethane resin to the polyester urethane resin. In the film-coated article X2, the polyester-based urethane resin layer was cracked, and the film floated without being adhered.

<Comparative example 4>
A film-coated article X2 was produced in the same manner as in Example 1 except that the material of the resin layer of the film was changed from polycarbonate urethane resin to acrylic resin. In the film-coated article X2, the acrylic resin layer was cracked, and the film floated without being adhered.

<Example 3>
A film was produced in the same manner as in Example 1 except that the thickness of the adhesive layer 1 was changed to 15 μm. In this embodiment, a pedestal is placed on a support base having a suction hole, and the block is placed on the pedestal to mount the film. In the following, the surface of the block that contacts the pedestal is the upper surface, and the surface opposite to the pedestal is the lower surface (the surface of the pedestal that contacts the support table is the upper surface).

The film-coated article A5 was produced as follows.
First, the block is placed on a pedestal (x: 130 mm × z: 30 mm × y: 15 mm), and the lower surface of the block is covered with the film softened by heating. The blocks were arranged so that the sides X, Z, Y thereof and the corresponding sides x, z, y of the pedestal were substantially parallel to each other. Subsequently, the air between the block and the film is deaerated by sucking from the upper surface side (pedestal side) of the block covered with the film. In the degassing step, the side surface on the long side was positioned laterally with respect to the degassing direction. Next, among the films adhered to the surface of the block and the pedestal by the deaeration process, the film of the pedestal portion was irradiated with laser light under the following conditions to cut the film, thereby obtaining a film-coated article A5.
Laser device: CO2 laser marker ("LP400" manufactured by Panasonic Corporation)
Wavelength: 9.3 μm
Output: 16W
Scanning speed: 100 mm / sec.
Laser light irradiation position: 1 mm above the lower surface of the base (the upper surface of the block) Average film thickness at the laser light irradiation position: 60 μm

  The film adhered to the block was easily cut at a desired position by the laser light irradiation, and the state of the cut edge was good. As described above, the upper surface bridge is easy to be formed on the portion that is in close contact with the pedestal of the film (the upper surface bridge as shown in FIG. 12 is also formed in this embodiment), but in this embodiment, the upper surface bridge portion is also easy. It was possible to laser cut. Similarly to the film-coated article A1, the film-coated article A3 was not confirmed to have side bridges and film lift, and realized a beautiful packaging form. The upper surface bridge formed in the portion that is in close contact with the pedestal of the film fixes the film and further suppresses peeling of the film.

<Comparative example 4>
A film-coated article X4 was produced in the same manner as in Example 3 except that the film used in Comparative Example 1 was used and the following laser apparatus was used.
Laser device: CO2 laser marker ("3-Axis" manufactured by Keyence Corporation)
Wavelength: 10.6 μm
Output: 80W
Scanning speed: 50 mm / sec.
Also in this case, it was possible to laser cut the film. However, as compared with the film-coated article A3, the state of the film cutting edge is not preferable because wrinkles are adhered and rough. Further, in the film-coated article X4, as in the film-coated article X1, side bridges and film floating occurred, and the packaging form was poor in appearance as compared with the film-coated article of the example. In addition, although it tried to cut | disconnect a film on the same conditions using the same laser apparatus as Example 3, it cannot cut | disconnect as above-mentioned, but a laser cut is carried out by using a higher output laser apparatus and making scanning speed slow. It has become possible.

  10, 50, 70y Film-coated article, 11, 71 battery cell, 11a, 71a top surface, 11b, 71b bottom surface, 11c, 11d, 71c, 71d side surface, 12, 51, 72 film, 13 electrode terminal, 13a top surface, 13b side surface , 18 Multi-layer film, 19 Resin layer, 20 Base layer part, 21 A layer, 22 B layer, 23 Inner layer, 24 Outer layer, 25, 26 Adhesive layer, 27 Core layer, 28 Multi-layer part, 29 Inner surface adhesive part, 52, 73 , 75 pedestal, 53 cut line, 54 surplus part, 55, 74, 76 bridge, 100 support base, 101 heater, 102 suction hole, 103 presser frame, 104 blade, α laser light, 110 battery module, 111 spacer, 112 end Plate, 113 Battery block

Claims (10)

An article having a top surface, a bottom surface, and a side surface, and a connection portion with another member provided on the top surface;
A film covering at least the bottom surface and the side surface of the article;
A film-coated article comprising:
The film includes a multilayer film including three or more multilayer portions in which an A layer and a B layer are laminated, and a resin layer provided on the side of the multilayer film that contacts the surface of the article,
The said resin layer is a film-coated article which is a resin layer which has a polycarbonate-type urethane resin as a main component.   The film-coated article according to claim 1, wherein the multilayer film includes 5 to 30 of the multilayer portion.   The film-coated article according to claim 1 or 2, wherein the multilayer film is laminated such that the multilayer portions are adjacent to each other. The A layer is composed of at least one selected from the group consisting of a polyamide resin, a polyolefin resin, a polyester resin, and a polystyrene resin,
The film-coated article according to any one of claims 1 to 3, wherein the B layer is composed of a resin having a melting point lower than that of the resin constituting the A layer.   The film-coated article according to any one of claims 1 to 4, wherein the resin layer is a printed layer formed by printing a urethane-based ink mainly composed of a polycarbonate-based urethane emulsion on the multilayer film. .   After covering the article with the film softened by heating, the film was brought into close contact with the surface of the article by deaeration between the article and the film from the upper surface side of the article. The film-coated article according to any one of claims 1 to 5.   The film-coated article according to any one of claims 1 to 6, wherein the film has an inner surface close-contact portion in which the inner surfaces of the film are in close contact with each other at least a part of the portion covering the upper surface of the article.   The film-coated article according to any one of claims 1 to 7, wherein the article is a battery cell having the connection portion as an electrode terminal. A method for producing a film-coated article according to any one of claims 1 to 8,
Heating and softening the film, and covering the article with the film;
Degassing between the article and the film from the upper surface side of the article in a state where the main film adhesion holding surface of the side of the article is positioned laterally with respect to the deaeration direction, A second step of closely attaching the film to the surface of the article;
A method for producing a film-coated article, comprising:   The method for producing a film-coated article according to claim 9, comprising a third step of irradiating the film coated with the article with laser light to cut the film.