JP2002056824A - Laminated film for battery, and battery container using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin and light laminated film for a battery having various mechanical strengths, high barrier property against steam or the like, high resistance against electrolyte and acid, and high heat resistance, and molding property for a thin tray-like container, and a high performance battery container using it. SOLUTION: The laminated film 50 for the battery is formed by laminating at least two-axis stretching polyester film layer 1 (6 to 12 μm in thickness), two-axis stretching nylon film layer 2 (15 to 30 μm in thickness), a metal film layer 3 (20 to 50 μm in thickness), and a thermally adhesive resin layer 4 (30 to 40 μm in thickness) in that order from the outside. The outer surface of the laminated film 50 is applied with chromate treatment as necessary. The laminated film 50 is molded into a bag-like container or a thin, cover-and-body type, tray-like container having a flange to form the battery container. The metal film layer 3 is preferably made of chromate-treated aluminum foil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated film used as an outer material of a battery, and a battery container using the same. As it can be suitably used for materials, it is thin and light, has a high degree of water vapor and other barrier properties, and has excellent resistance to electrolytes and acids, as well as heat resistance to heat during heat sealing.
The present invention relates to a battery laminated film having moldability into a tray-like container and the like, and a battery container using the same.

[0002]

2. Description of the Related Art Conventionally, a metal container is generally used as a container as an exterior material of a battery. However, with the development of various electronic devices such as notebook computers and mobile phones,
With its spread, its thickness and weight have been reduced,
Batteries used in these devices are also required to be as thin and light as possible so that the weight of the batteries is as small as possible and the space for the batteries in the equipment used is as small as possible.

In order to meet such a demand, for example,
Various polymer batteries have been researched and developed in which a polymer material is introduced into electrodes and electrolytes of the battery, and the thickness and weight of the polymer battery are reduced to a sheet or the like. A typical example of such a polymer battery is, for example, a lithium polymer battery.In order to reduce the thickness of the battery itself, these polymer batteries are also made thinner by using a laminated film for the outer material. The method is adopted.

[0004] When a laminated film is used as an exterior material of a polymer battery, the form and the method of use include, for example, a three-sided seal type, a four-sided seal type, a pillow pouch type, etc. A method of forming a battery by forming a battery into a battery, storing the constituent materials of the battery inside, extending the electrode terminals from the inside to the outside through an opening, and sealing the opening by heat bonding, or a laminated film. Is formed in a tray shape with a flange portion around it, the constituent materials of the battery are stored in the concave portion, the electrode terminals are extended outward, the upper portion is covered with a lid made of a laminated film, and the flange portion is formed. There is a method of forming a battery by sealing by heat bonding.

[0005] The laminated film used for the exterior material of such a battery has, in addition to its lightness and thinness, various mechanical strengths, resistance to electrolytes and the like, water vapor and other barrier properties, and heat resistance during heat sealing. Various properties such as heat resistance, heat sealing properties, and thermal adhesion to the electrode terminals are required. Particularly, when used in the form of a tray with a flange, the formability is also required. Also, the battery
In the case of lithium polymer batteries, etc., when moisture enters the interior, it reacts with the electrolyte component to generate hydrogen fluoride, which invades the inner surface of the metal foil layer through the heat-adhesive resin layer. Sometimes. Therefore, the laminated film requires a high degree of moisture resistance.

[0006] The laminated film used for the exterior material of such a battery may be made of a different material depending on whether the exterior shape is a bag type by bag-making or a tray-like container type subjected to molding. Although it is necessary to slightly change the thickness etc., in order to reduce the thickness of the laminated film as much as possible, based on a configuration in which a base layer, a metal foil layer, and a thermo-adhesive resin layer are sequentially laminated from the outside, If necessary, a configuration in which an intermediate layer or the like is added can be adopted.

For the base material layer, for example, various types of biaxially stretched nylon films having excellent mechanical strength can be used. For the metal foil layer, an aluminum foil is used. As the layer, for example, a single layer of any one of polyethylene, polypropylene, acid-modified polypropylene and the like, or a composite layer in which two or more kinds are appropriately laminated can be used.

[0008]

However, even when the laminated film is constructed as described above, the biaxially stretched nylon film as the outermost layer has excellent mechanical strength, but is slightly inferior in heat resistance, and has a poor heat resistance. When it is easy to whiten by heat, the resistance to the electrolyte is insufficient, and when the laminated film is drawn into a tray-like container with a flange using, for example, a male type and a female type, the surface of the biaxially stretched nylon film The coefficient of friction is somewhat high, the moldability is slightly inferior, and the aluminum foil of the metal foil layer, if the hydrogen fluoride is generated as it is, it is likely to be eroded through the heat adhesive resin layer, etc. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object the following.
A laminated film used for battery exterior materials, which is thin and light, has a high degree of water vapor and other barrier properties, has excellent resistance to electrolytes and acids, and has excellent heat resistance to heat during heat sealing, etc. It has good thermal adhesiveness and suitability for bag making, as well as moldability for tray-like containers, etc., and is suitable for use in exteriors such as lithium polymer batteries that have strict requirements for various performances. It is an object of the present invention to provide a battery laminated film that can be used and a battery container excellent in performance using the same.

[0010]

The above objects can be attained by the present invention described below. That is, the invention described in claim 1 is a laminated film used for an exterior material of a battery, wherein the laminated film is at least 2
It comprises a laminated film for batteries, which is formed by a laminated body in which an axially stretched polyester film layer, a biaxially stretched nylon film layer, a metal foil layer, and a heat-adhesive resin layer are laminated in this order.

[0011] By adopting such a structure, the laminated film for a battery of the present invention has a biaxially stretched polyester film layer laminated on the outside of the biaxially stretched nylon film layer. It also has excellent heat resistance and does not swell or dissolve even if the electrolyte adheres to the surface, and can prevent the surface from being whitened by heat during heat sealing. The biaxially stretched nylon film layer provides various excellent mechanical strengths such as toughness, high impact strength, high burst strength, and pinhole resistance and excellent low-temperature properties. Other barrier properties are imparted, and heat sealing properties are imparted by the heat-adhesive resin layer. Further, since the outermost biaxially stretched polyester film layer of the laminated film is superior in slipperiness as compared with the lower biaxially stretched nylon film layer, the laminated film is formed, for example, in a thin flanged tray-like container. When molding into a uniform shape, it can be uniformly molded without wrinkles or the like.

Therefore, it is thin and light, has basic properties such as mechanical strength, water vapor and other barrier properties, heat sealing properties, etc. as a battery exterior material, and its surface can be whitened by heat during heat sealing. In addition, it is possible to provide a laminated film for a battery, which does not swell or dissolve even if an electrolytic solution adheres by mistake, and also has moldability to a tray-shaped container or the like.

According to a second aspect of the present invention, the metal foil layer is an aluminum foil, and at least the inner surface thereof is subjected to a chromate treatment. It is.

As the metal foil layer, besides aluminum foil, copper foil, tin foil, nickel foil and the like can be used. Among them, aluminum foil is lightweight, rich in extensibility and workability in forming and laminating. In addition to being excellent in water vapor and other barrier properties, it is also relatively inexpensive as a versatile metal foil and has excellent economic efficiency. Further, by subjecting at least the inner surface of the aluminum foil layer to a chromate treatment, the resistance to hydrogen fluoride derived from the electrolyte can be improved. A typical chromate treatment is to apply an aqueous solution of a phenol resin, phosphoric acid, and chromium (III) fluoride compound by a roll coating method or the like, and then set the temperature of the aluminum foil to 170 to 200.
The film is formed by heating to ℃. Such a chromate treatment may be performed only on the inner surface of the aluminum foil layer, but is more preferably performed on both surfaces.

By adopting such a configuration, in addition to the functions and effects of the invention described in the first aspect, processing such as lamination is easy and moldability such as press molding is good.
It is possible to produce a laminated film for batteries excellent in water vapor and other barrier properties, resistant to hydrogen fluoride and the like, and also excellent in economic efficiency with high productivity.

According to a third aspect of the present invention, the biaxially stretched polyester film layer has a thickness of 6 to 12 μm, and the outer surface of the biaxially stretched polyester film layer has
The laminated film for a battery according to claim 1 or 2, wherein the coefficient of dynamic friction is maintained at 0.3 or less by silicone treatment. The dynamic friction coefficient is determined by JI
SK7125 Dynamic coefficient of friction measured according to the method of testing the coefficient of friction of plastic films and sheets.

The biaxially stretched polyester film layer comprises:
The lower biaxially stretched nylon film layer is laminated in order to improve the resistance to an electrolyte and the heat resistance, which are the weak points of the biaxially stretched nylon film layer, and the thickness is preferably 6 to 12 μm. When the thickness of the biaxially stretched polyester film layer is less than 6 μm, the resistance to the electrolytic solution can be improved, but the effect of improving the heat resistance, that is, the effect of preventing the biaxially stretched nylon film from whitening due to heat during heat sealing. Is not preferable because it is not sufficiently obtained. Also, 12μ
A thickness exceeding m is not preferable because both the resistance to the electrolyte and the heat resistance already have a sufficient improvement effect, and there is no necessity thereof, but rather contrary to the gist of making the thickness of the laminated film as thin as possible. .

Regarding the coefficient of friction of the outer surface of the laminated film, that is, the outer surface of the biaxially stretched polyester film layer, when the laminated film is processed into a battery container, for example, a male mold and a female mold are used. When forming into a tray-like container with a flange having a depth of about 3 mm or more and about 5 mm by press molding or the like, if the surface has insufficient slipperiness, it is difficult to form the container uniformly. For this reason, the outer surface of the biaxially stretched polyester film layer preferably maintains the dynamic friction coefficient at 0.3 or less, more preferably about 0.1. Such a coefficient of kinetic friction can be more reliably obtained by subjecting the outer surface of the biaxially stretched polyester film to a silicone treatment.

By adopting such a configuration, in addition to the functions and effects of the invention described in claim 1 or 2, the outer surface of the laminated film has resistance to electrolyte, heat resistance,
Since the slipperiness is more reliably improved, the surface of the laminated film is not eroded by the electrolytic solution, is not whitened by heat at the time of heat sealing, and is further thinned by press molding or the like. When forming into a tray-shaped container with a flange, a uniform tray-shaped container can be manufactured with high productivity without uneven thickness or wrinkles.

Next, a fourth aspect of the present invention is a battery container for storing a battery constituent material therein and used for forming a battery, wherein the container is formed of the above-described first to third embodiments. A battery container formed of the battery laminated film according to any one of the above.

With such a configuration, a battery container can be manufactured using the battery laminated film according to any one of the first to third aspects of the present invention. Regardless of the bag type such as seal type, or the molded container type consisting of a tray-shaped container with a flange and a lid material, the surface is not whitened by the heat at the time of heat sealing, and it is molded well. Thus, a battery container can be easily manufactured by bag making or molding. The manufactured battery container is thin and light, has excellent mechanical strength, has a high level of water vapor and other barrier properties, and has excellent resistance to electrolytes, hydrogen fluoride, etc., and excellent heat resistance. Thus, a battery container having excellent overall performance can be obtained.

According to a fifth aspect of the present invention, the container comprises:
A lid material is overlapped on a tray-shaped container with a flange formed by press molding, and a thermal bonding method is used at the flange portion, or the tray-shaped container with the flange is stacked up and down such that the inner surfaces thereof are opposed to each other. The battery container according to claim 4, wherein the battery container is any one of a type of heat bonding at a part.

By adopting such a configuration, in addition to the operation and effect of the invention described in the fourth aspect, when forming the battery by storing the constituent materials of the battery in the tray-like container with a flange, the opening is large. The battery components can be mounted from the top of the tray-shaped container, and the lid can be thermally bonded and sealed at the flange to form the battery. Can be manufactured. In addition, when the battery container is configured using a tray-shaped container with a flange on both its lids, it is compared with a case where a tray-shaped container with a flange is used only on the body and the lid material is configured with a flat laminated film. Then, the depth of the molding recess is set to 1
Since the thickness can be reduced to / 2, there is an advantage that the thickness of the biaxially stretched nylon film layer or the metal foil layer of the laminated film can be reduced accordingly.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the invention, such as materials used for a laminated film for a battery of the present invention, a method for laminating the same, and a method for manufacturing a battery container using the laminated film will be described. As described above, the laminated film for a battery according to the present invention is a laminated film used for an exterior material of a battery, and includes a biaxially oriented polyester film layer, a biaxially oriented nylon film layer, and a metal foil layer from at least the outside. Basically, a configuration in which a heat-adhesive resin layer is formed of a laminated body that is sequentially laminated. Then, such a laminated film is formed, for example, in a four-sided seal type or the like into a bag shape with one end opened, or formed into a shallow tray-shaped container provided with a flange portion around the periphery in a lid type or the like. A battery case is manufactured, and the constituent materials of the battery are stored inside the battery case, and the electrode terminals are extended from the inside to the outside,
The opening is sealed by thermal bonding to manufacture a thin battery or the like.

In the construction of the laminated film, the biaxially stretched polyester film layer has a biaxially stretched polyethylene terephthalate film which is excellent in heat resistance, chemical resistance (acid, alkali, etc.), solvent resistance, etc. in addition to tensile strength. (O-PET) or biaxially stretched polyethylene naphthalate film (O-PEN) can be suitably used. For the biaxially stretched nylon film layer, a biaxially stretched film such as nylon 6, 66, 12, or MXD6 can be used.

The metal foil layer is provided to impart a high degree of water vapor and other barrier properties to the laminated film. As described above, an aluminum foil is preferably used for the metal foil layer. can do. And
At least the inner surface (the surface on the side on which the heat-adhesive resin layer is laminated) is subjected to a chemical conversion treatment, specifically, the above-described chromate, in order to improve the resistance to the hydrogen fluoride and the like, that is, the corrosion resistance. Preferably, a treatment is applied. This chromate treatment is more preferably performed on both surfaces of the aluminum foil. When the above-mentioned chromate treatment is performed, not only the corrosion resistance of the aluminum foil is improved, but also when the biaxially stretched nylon film or the heat-adhesive resin layer is laminated, the heat-resistant adhesive strength can be increased.

The biaxially stretched polyester film layer and
Lamination with an axially stretched nylon film layer and lamination with a biaxially stretched nylon film layer and a metal foil layer
It can be easily carried out by a known dry lamination method using a two-component curable adhesive such as a polyurethane-based adhesive. The lamination surface of each of the above-mentioned layers may be subjected to an easy-adhesion treatment such as a corona discharge treatment and an ozone treatment as necessary to improve the adhesion.

The heat-adhesive resin layer, which is the innermost layer of the laminated film, has a heat-resistant property as well as resistance to contents, that is, resistance to an electrolytic solution containing an electrolyte, and the laminated film formed into a tray-like container. When used, its formability is also required. Various polyolefin resins can be used for such a heat-adhesive resin layer. Among them, linear low-density polyethylene (L-LDPE), medium-density polyethylene (MDPE), polypropylene, and acid-modified polypropylene Etc. can be suitably used. These may be used alone or as a blend. Further, two or more kinds of layers can be laminated to form a multilayer.

Examples of the acid-modified polypropylene include graft polymerization modified with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, citraconic anhydride, itaconic acid, and itaconic anhydride, or anhydrides thereof. Polypropylene or a polypropylene blended with a polyolefin resin copolymerized with the acid component can be used. These may be used alone or as a blend of two or more. Acid-modified polypropylene is excellent in thermal adhesiveness to metal, in addition to thermal adhesiveness between itself, so that, for example, the surface of an electrode terminal extending from the inside of the battery container to the outside is made of bare metal. Even in such a case, it is possible to heat-seal and seal the edge portion such as the flange portion of the container well.

The method of laminating such a heat-adhesive resin layer on the inner surface of the metal foil layer is as follows: a film of the heat-adhesive resin layer previously formed into a film is formed by a two-component curing type dry lamination. A method of laminating by a dry lamination method using an adhesive. A method of laminating a film of a thermoadhesive resin layer that has been formed into a film in advance by a method called a thermal lamination method only by applying heat and pressure, but in this case, a kind of primer is provided on the lamination surface of the metal foil layer. It is preferable to form a coating layer such as an acid-modified polypropylene as a coat. The film of the heat-adhesive resin layer formed in advance into a film shape is subjected to an extrusion lamination method (commonly called a sandwich lamination method).・ LDPE
A method in which a thermo-adhesive resin such as is extruded in the form of a film, pressed from both sides, and adhered and laminated. In this case, if necessary, the adhesion can be improved by applying a primer coat to the lamination surface of the metal foil or laminating it while performing ozone treatment. A method of forming a coating layer such as an acid-modified polypropylene as a kind of primer coat on the laminated surface of the metal foil layer, and then directly extruding and coating the resin of the heat-adhesive resin layer thereon, Or, there is a method of extruding and coating the resin of the heat-adhesive resin layer directly on the laminated surface of the metal foil layer while performing the ozone treatment on the laminated film, depending on the use conditions of the laminated film, etc. A suitable method can be appropriately selected and used.

Then, the outer surface of the laminated film, that is,
The silicone treatment applied to the outer surface of the biaxially stretched polyester film layer may be performed by simply applying a thin silicone oil as a slipping agent. In addition to siloxane, straight silicone oil such as dimethyl silicone oil and methylphenyl silicone oil, or amino-modified It is preferable to apply and cure a reactive silicone oil such as epoxy-modified or carboxyl-modified. Such a silicone treatment may be performed on the biaxially stretched polyester film before lamination, or may be performed on the biaxially stretched polyester film surface of an intermediate stage laminated film in which a part such as a biaxially stretched nylon film or a metal foil is laminated. Alternatively, it may be performed on the surface of the biaxially stretched polyester film after lamination up to the innermost heat-adhesive resin layer. In addition, the order of lamination of each layer of the laminated film can be freely determined in consideration of productivity and yield.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below more specifically with reference to the drawings. However, unless the present invention exceeds the gist,
It is not limited to the following drawings. FIG. 1 is a schematic cross-sectional view showing the configuration of one embodiment of the battery laminated film of the present invention. FIGS. 2, 3 and 4 show batteries manufactured using the battery laminated film of the present invention, respectively. FIG. 1 is a schematic plan view or a schematic cross-sectional view illustrating a configuration of an example of a container for use. FIG. 5 is a perspective view showing a configuration of an example of a battery manufactured using the battery container of the present invention.

The battery laminated film 50 shown in FIG.
A biaxially stretched polyester film layer 1, a biaxially stretched nylon film layer 2, a metal foil layer 3, and a thermoadhesive resin layer 4 are sequentially laminated from the outside (upper side in the figure). , That is, the outer surface of the biaxially stretched polyester film layer 1 can be subjected to a silicone treatment (not shown) if necessary. still,
An adhesive layer, a primer coat layer, and the like provided between the respective layers according to the respective lamination methods are omitted.

In the above configuration, the biaxially stretched polyester film layer 1 has the lower layer 2 as described above.
This is provided to cover the weaknesses of the axially stretched nylon film layer 2 such as the resistance to the electrolytic solution and the heat resistance to heat during heat sealing. It is preferably 12 μm. And the thickness of the biaxially stretched nylon film layer 2 is
When the laminated film 50 is processed into a bag-shaped battery container such as a four-sided seal type and used, the thickness may be about 15 μm. For example, the laminated film 50 is formed into a flanged tray-like container having a depth of about 3 to 5 mm. When used, the thickness is preferably about 25 μm.

The metal foil layer 3 has a thickness of about 20 to 30 μm when using a chromate-treated aluminum foil when the laminated film 50 is processed into a bag-shaped battery container. In the case of molding into a tray-like container with a flange of the above-mentioned depth and using it, 3
A thickness of about 0 to 50 μm is preferred. The thickness of the innermost heat-adhesive resin layer 4 depends on the configuration of the portion where the electrode terminals are interposed when the laminated film 50 is processed into a battery container. Also in the case of a tray-shaped container, a thickness of about 30 to 40 μm is appropriate.

The lamination of the biaxially stretched polyester film layer 1 and the biaxially stretched nylon film layer 2 and the lamination of the biaxially stretched nylon film layer 2 and the metal foil layer 3 are carried out by a known dry lamination method. It is preferable to use a two-component curable adhesive such as the one having excellent adhesive performance. Regarding the method of laminating the heat-adhesive resin layer 4 on the inner surface of the metal foil layer 3, four kinds of methods, namely, a dry lamination method, a heat lamination method, an extrusion lamination method, and an extrusion coating method are described in detail first. Depending on what kind of battery container the laminated film 50 is used as, it can be appropriately selected and used. In particular, when the laminated film 50 is used as a container of the lithium polymer battery,
Since there is a problem of the resistance to the hydrogen fluoride, it is preferable to adopt a thermal lamination method which is excellent in the resistance.

By adopting such a constitution, it is thin and light, has various mechanical strengths, water vapor and other barrier properties,
It excels in basic performance as a battery exterior material, such as heat sealability, and has excellent heat resistance, electrolyte resistance, and slipperiness, and does not whiten due to heat during heat sealing. The present invention can provide a laminated film for a battery which does not swell or dissolve even when the liquid adheres and which has excellent moldability into a tray-like container.

FIG. 2 is a schematic plan view showing the structure of a first embodiment of a battery container manufactured using the battery laminated film of the present invention. The battery container 100 shown in FIG.
The battery laminated film 50 having the structure as shown in FIG.
And made into a four-sided seal-type bag. That is, the laminated films 50 are overlapped so that the heat-adhesive resin layers thereof are opposed to each other, and three peripheral edges are heat-sealed with the heat-bonding portion 8, and one end is opened in the opening 9 into a bag shape. It is made by bag making.

When a battery is manufactured using such a battery container 100, a battery constituent material is inserted through the opening 9 and the electrode terminals are extended from the inside to the outside through the opening 9, and then the opening 9 is removed. By performing heat sealing together with the electrode terminals and sealing, a thin battery can be manufactured (see FIG. 5). At this time, the heat seal part of the electrode terminal
By previously coating with an acid-modified polypropylene or by inserting a film of an acid-modified polypropylene on both sides of the electrode terminal and heat-sealing, heat-sealing of the passage portion of the electrode terminal can be performed more favorably. Such an electrode terminal heat sealing method is shown in FIG.
The same can be applied to the battery container shown in FIG.

When the battery container is formed in a four-sided sealed bag-shaped container, it is not always necessary to previously form a bag-shaped container having one open end as shown in the figure. For example, a dedicated filling and sealing device is prepared. By placing the constituent materials of the battery on one of the battery laminate films and extending the electrode terminals from one end to the outside, the other laminate film is superimposed on the other, and the peripheral edges are formed. May be successively or simultaneously heat-sealed to form a thin battery.

Next, FIG. 3 is a schematic sectional view showing the configuration of a second embodiment of a battery container manufactured using the battery laminated film of the present invention. Battery container 20 shown in FIG.
Reference numeral 0 denotes a tray-like container 5 with a flange formed by press molding, and a flat lid member 7 put on the tray-like container 5, each of which has a battery stack having a configuration as shown in FIG. The film 50 is formed.

In such a battery container 200, the material for the battery is mounted in the molded concave portion of the tray-like container 5 with a flange, and the electrode terminals are extended from the inside to the outside. A thin battery can be produced by heat-sealing and sealing the two with the surrounding flange portion 6 (see FIG. 5). Although the battery container 200 has a two-piece configuration in which the tray-like container 5 with flange and the lid member 7 are separately cut off, in this case, the lid member 7 has a flat shape and is not molded. So the laminated film 2
The thickness of the axially stretched nylon film layer or metal foil layer can be reduced. Further, the battery container 200 may have a one-piece configuration in which the flanged tray-shaped container 5 and the lid member 7 are hingedly connected at one end of the flange portion 6.

FIG. 4 is a schematic sectional view showing the structure of a third embodiment of a battery container manufactured using the battery laminated film of the present invention. The battery container 300 shown in FIG.
In the configuration of the battery container 200 shown in FIG. 3, the lid member 7 is also configured by using a tray-like container 5 with a flange similar to the tray-like container 5 with a lower flange. When such a configuration is adopted, since the molded concave portion is formed in the tray-shaped container 5 with flanges on both the lids,
The depth of each forming recess can be reduced to, for example, １ ／. Therefore, the tray-like container 5 with a flange
The thickness of the biaxially stretched nylon film layer or the metal foil layer of the laminated film used for molding can be reduced by the reduced drawing depth. Also in this case, the tray-like container 5 with upper and lower flanges may be formed in a one-piece configuration in which one end of the peripheral flange portion 6 is hingedly connected.

FIG. 5 is a perspective view showing the structure of an example of a battery manufactured using the battery container of the present invention. However, since the battery itself is thin, its thickness is omitted.
The battery 500 shown in FIG. 5 has a flat upper surface, and thus corresponds to the battery manufactured using the battery container 200 shown in FIG. 3, but the battery 500 shown in FIGS. When a battery is produced using the containers 100 and 300, the shape is substantially the same except that a slight bulge is formed on the upper surface.

Such a thin battery 500 is, for example,
Using the battery container 200 shown in FIG. 3, the constituent material of the battery is mounted from above into the molded concave portion of the tray-like container 5 with flange, and from the inside to the outside via the flange 6 at one end. , Positive and negative electrode terminals 10a, 10b
Is extended, and a lid 7 is placed thereon, and the two are thermally bonded to each other with a surrounding flange portion 6, that is, a thermal bonding portion 8, to thereby seal them. In this case, the mounting of the battery constituent material on the tray-like container 5 with flange is very easy to operate because the upper part of the molding recess is largely open, and the battery can be manufactured with high productivity.

[0046]

As described above in detail, according to the present invention, a laminated film used for a battery exterior material is thin, light, excellent in various mechanical strengths, and has a high level of water vapor and other barriers. With excellent resistance to electrolytes and acids, excellent heat resistance, good moldability into trays, etc., no whitening of the surface during heat sealing, and various performance requirements It is advantageous in that a laminated film for a battery that can be suitably used for the exterior of a lithium polymer battery or the like and a battery container excellent in various performances using the same can be provided with high productivity.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing the configuration of one embodiment of a battery laminated film of the present invention.

FIG. 2 is a schematic plan view showing a configuration of a first embodiment of a battery container manufactured using the battery laminated film of the present invention.

FIG. 3 is a schematic cross-sectional view showing a configuration of a second embodiment of a battery container manufactured using the battery laminated film of the present invention.

FIG. 4 is a schematic sectional view showing the configuration of a third embodiment of a battery container manufactured using the battery laminated film of the present invention.

FIG. 5 is a perspective view showing a configuration of an example of a battery manufactured using the battery container of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Biaxially stretched polyester film layer 2 Biaxially stretched nylon film layer 3 Metal foil layer 4 Thermal adhesive resin layer 5 Tray-shaped container with flange 6 Flange part 7 Lid material 8 Thermal adhesive part 9 Opening 10a, 10b Electrode terminal 50 Battery Laminated film for battery 100, 200, 300 Battery container 500 Battery

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazuki Yamada 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Inventor Hiroshi Miyama 1-1-1, Ichigaya-kamachi, Shinjuku-ku, Tokyo No. 1 Dai Nippon Printing Co., Ltd. (72) Inventor Rikiya Yamashita 1-1-1 Ichigaya Kagacho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. 5H011 AA01 AA02 AA10 CC02 CC06 CC10 DD03 DD09 DD13 KK01

Claims (5)

[Claims] 1. A laminated film used as an exterior material of a battery, wherein the laminated film is a biaxially stretched polyester film layer, a biaxially stretched nylon film layer, a metal foil layer, a heat-adhesive resin layer from at least the outside. Are formed in a laminated body in which are laminated in order. 2. The laminated film for a battery according to claim 1, wherein the metal foil layer is an aluminum foil, and at least an inner surface thereof is subjected to a chromate treatment. 3. The biaxially stretched polyester film layer has a thickness of 6 to 12 μm, and the outer surface of the biaxially stretched polyester film layer is maintained at a dynamic friction coefficient of 0.3 or less by silicone treatment. The laminated film for a battery according to claim 1 or 2, wherein 4. A battery container for containing a battery constituent material therein and used for forming a battery, wherein the container is the battery laminated film according to any one of claims 1 to 3. A battery container characterized by being formed. 5. The container according to claim 1, wherein a lid material is overlapped on a tray-shaped container with a flange formed by press molding, and heat-bonded at a flange portion. The battery container according to claim 4, wherein the container is one of a type in which the batteries are vertically stacked so as to face each other and are thermally bonded at a flange portion.