JP2004079464A - Battery package - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery package having excellent resistance to battery constituent material contents housed in the inside, and used for the purpose of reducing weight and size. <P>SOLUTION: This battery package 1 is used for housing battery constituent materials in its inside. The battery package is composed by bending a square film to make facing two sides at both ends confront with each other, by stacking a tape on the inside of the confronting part to seal it, and by executing tape-sticking pillow-packaging for sealing its opening parts of the film formed into a tubular shape. The battery package is characterized by that the square film 2 comprises aluminum foil 2b as the middle layer, a resin layer 2a as a surface layer and a heat sealing resin layer 2c as the innermost layer; the tape 3 comprises aluminum foil 3b as the middle layer, and heat sealing resin layers 3c as the front and back layers, and the width of the aluminum foil forming the tape is smaller than those of the front and back heat sealing resin layers; and the battery package is sealed and tightly closed by stacking, by thermal deposition, the tape on the inside where both the ends of the square film are made to confront each other so as not to expose the aluminum foil from the end faces of the tape in both its side parts. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
When a battery packaging material used to form a battery is formed of a composite material of a metal and a resin such as an aluminum foil, the metal layer is not exposed from the container. The present invention relates to a battery package that is excellent in resistance to contents of battery constituent materials to be stored and is flexible and lightweight and thin.
[0002]
[Prior art]
Heretofore, a metal container has been used in most cases as a container serving as an exterior material of a battery. However, with the development and spread of electronic devices such as mobile communication devices, notebook computers, palmtop computers, integrated video cameras, portable CD players, headphone stereos, and cordless phones, their thickness and weight have been reduced. In addition, the batteries used in these devices are required to be as light as possible and to be thin and light so that the space for the batteries in the equipment to be used can be reduced as much as possible.
[0003]
To meet such demands, for example, various polymer batteries have been researched and developed in which a polymer material is introduced into the electrodes and electrolytes of the battery, and the thickness and weight of the polymer battery are reduced to a sheet shape 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 as an outer material. The method is adopted.
[0004]
When the laminated film is used as the outer material of the polymer battery, the form and the method of use include, for example, forming the laminated film into a tray shape having a flange portion around the periphery, storing the constituent materials of the battery in the concave portions, and There is a method of forming a battery by extending the electrode terminals outward, covering the upper portion thereof with a lid material of a laminated film, and heat-sealing and sealing with a flange portion.
[0005]
Specifically, as shown in FIG. 6, a heat-resistant protective layer 18d, a biaxially stretched nylon film layer 18a, a metal foil layer 18b, and a heat-adhesive resin layer 18c are sequentially laminated from the outside (upper side in the figure). A deep drawing process as shown in FIG. 7 is performed using the battery laminated film 18 having the configuration, and a tray-shaped container body 19 with a flange formed by press molding and a flat lid member 20 covered thereon are formed. The container thus configured was used as a battery container.
[0006]
The laminated film used for the exterior material of such a battery has, in addition to its lightness and thinness, resistance to various mechanical strengths and electrolytes, water vapor and other barrier properties, heat sealing properties, and heat resistance to electrode terminals. Various performances such as adhesion are required, and when the battery is a lithium polymer battery, etc., when moisture enters inside, it reacts with the electrolyte component to generate hydrogen fluoride, reaching the aluminum foil, Causes corrosion on aluminum foil. For this reason, there has been a problem that the adhesive force between the aluminum foil and the heat-adhesive resin layer is significantly reduced, and the adhesive surface is peeled off.
[0007]
Therefore, the laminated film used for the exterior material of such a battery has a basic structure in which a base layer, a metal foil layer, and a heat-adhesive resin layer are sequentially laminated from the outside, and further has a high degree of water vapor and other barrier properties. It is necessary to have a multilayer structure such as adding a film having a high mechanical strength and a biaxially stretched nylon film having excellent mechanical strength. In addition, there is a problem that it is necessary to select a material in consideration of the above, which inevitably leads to an increase in cost.
[0008]
In the case of forming and using the above-mentioned tray with a flange, there is a limit to the squeezing depth (about 5 to 6 mm), and a metal foil such as an aluminum foil having a thickness of about 40 μm is used. However, there is a problem that the thickness of the metal foil has to be increased, which inevitably increases the cost. Even if the thickness of the aluminum foil is increased, the thickness of the molded container corner portion is reduced by 50 to 60%. Therefore, in the case of a tray-shaped battery container with a flange, the container is lighter and thinner. There were problems in achieving this.
[0009]
[Problems to be solved by the invention]
The present invention has been made in order to solve the above-described problems, and contains a battery constituent material therein, and forms a battery package used for forming a battery with a metal such as an aluminum foil and a resin. In the case where the battery package is made of a composite material of the above, without providing a metal layer exposed from the container, a battery package for the purpose of reducing the weight and thickness which is flexible and has excellent resistance to the contents of battery constituent materials housed therein is provided. It is the purpose.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is:
In a battery package used to house a battery constituent material and form a battery,
A battery package body formed by folding a rectangular film, butting two opposing sides at both ends, sealing and overlapping tape on the butted inside, and sealing a taped pillow to seal the cylindrical opening. The square film, an aluminum foil as an intermediate layer, the surface layer is a resin layer and the innermost layer is a heat seal resin layer, and the tape is an aluminum foil as an intermediate layer, the front and back are heat seal resin layers, and The width of the aluminum foil formed on the tape is narrower than the width of the heat-sealable resin layer on the front and back, and the tape is heated to the inside where the rectangular film is abutted so that the aluminum foil is not exposed on the end faces of both sides of the tape. A battery package characterized by being overlapped and sealed by fusion.
[0011]
The invention according to claim 2 is
In a battery package used for forming a battery, containing a battery constituent material therein,
A battery package body obtained by folding a rectangular film, overlapping and sealing two opposing sides at both ends, and sealing the opening formed into a cylindrical shape by pillow packaging with an envelope, wherein the rectangular film is formed of aluminum foil. As an intermediate layer, at least the front and back of the aluminum foil are made of a heat-sealing resin layer, and the inside of the front and back heat-sealing resin layers so that the end surface of the aluminum foil inside the back seal portion to be enveloped is not exposed. A battery package, wherein a heat-sealing resin layer on both sides of an aluminum foil is sealed by being overlapped and sealed by heat fusion.
[0012]
The invention according to claim 3 is:
2. The battery package according to claim 1, wherein the tape is overlapped and sealed by heat fusion so that at least the aluminum foil layer of the tape covers the gap formed by abutting both ends of the rectangular film. Features.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example of a preferred embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of the battery package of the present invention, and (a) is a schematic perspective view thereof. (B) is an AA 'schematic sectional view of the battery package shown in (a). As shown in the figure, for example, a battery package 1 of the present invention is obtained by bending a rectangular film, butting two opposing sides at both ends, sealing a tape on the butted inside, sealing the cylindrical opening, A battery package formed by tape-filled pillow packaging that seals a part, wherein the rectangular film 2 includes an aluminum foil 2b as an intermediate layer, a surface layer including a resin layer 2a, and an innermost layer including a heat-sealing resin layer 2c; The tape 3 has an aluminum foil 3b as an intermediate layer and is composed of a front and back heat-sealable resin layer 3c, and the width of the aluminum foil layer 3b formed on the tape is smaller than the width of the front and back heat-sealable resin layers 3c. Then, the tape is overlapped and sealed by heat fusion on the inside where the rectangular film is butted so that the aluminum foil layer 3b is not exposed on the end faces of both side portions of the tape. After accommodating the battery constituent material 11 through the opening, both ends 6 and 7 of the opening are sealed by heat fusion, and further a gap formed by abutting both ends of the rectangular film. The tape is overlapped and sealed by heat fusion so as to cover at least the aluminum foil layer 3b of the tape 3. Then, the electrode terminals 8, 9 extend outward from the inside of the package through the opening, and the end 6 of the opening is sealed by heat fusion.
[0014]
By making the width of the aluminum foil layer of the tape narrower than the width of the front and back heat-sealing resin layers, the rectangular film is bent, the two opposing sides at both ends are butted, and the tape is overlapped and sealed inside the butted inside. In a battery package formed by tape-attached pillow packaging that seals the cylindrical opening, a tape is applied to the inside where a rectangular film is abutted so that an aluminum foil layer is not exposed at the end surfaces of both side portions of the tape. Is sealed by heat-sealing, so that even if the battery constituting material contained in the container contains a corrosive substance, the aluminum foil causes corrosion and causes a gap between the aluminum foil and the heat-adhesive resin layer. The problem that the adhesive strength of the adhesive is significantly reduced and the adhesive surface is peeled off is eliminated.
[0015]
FIG. 2 shows another example of the battery package of the present invention, and (a) is a schematic perspective view thereof. (B) is an AA 'schematic sectional view of the battery package shown in (a). As shown in the figure, for example, the battery package 12 of the present invention is formed by folding a rectangular film, overlapping and sealing two opposing sides at both ends, and sealing the cylindrical opening. Wherein the rectangular film 13 has an aluminum foil 13b as an intermediate layer, at least the front and back of the aluminum foil 13b are made of a heat-sealable resin layer 13c, and the width of the aluminum foil layer 13b is The width of the heat-sealing resin layer 13c is smaller than the width of the heat-sealing resin layer 13c. After the battery constituent material 11 is accommodated through the opening, both ends 6, 7 of the opening are sealed by heat fusion. Intended, characterized in that it is, and, extending outwardly through the aperture electrode terminals 8 and 9 from the inner container is sealed by heat sealing the ends 6 of the opening.
[0016]
By making the width of the aluminum foil layer of the tape smaller than the width of the front and back heat-sealable resin layers, the rectangular film is bent, and the two opposing sides of both ends are overlapped and sealed. In the case of a battery package made of pillow-wrapped envelopes that seal the part, the end face of the aluminum foil inside the back seal part to be enveloped is not exposed, so that the battery constituent material contained in the container contains corrosive substances, etc. Even in this case, the problem that the aluminum foil causes corrosion, the adhesive force between the aluminum foil and the heat-adhesive resin layer is significantly reduced, and the adhesive surface is peeled off is solved.
[0017]
As shown in FIG. 3, the base material of the rectangular film 2 used in the present invention is, for example, a laminated film including an aluminum foil 15b as an intermediate layer, a surface layer including a resin layer 15a, and an innermost layer including a heat sealing resin layer 15c. Can be used.
[0018]
As shown in FIG. 4 (a), the base material of the rectangular film 13 used in the present invention is, for example, a laminated film 16 in which an aluminum foil 16b is used as an intermediate layer, and a surface layer is composed of a heat sealing resin layer 16c. Then, the end face of the aluminum foil 16b is immersed in, for example, a 6% aqueous solution of caustic soda at 60 ° C. to perform an etching treatment, and as shown in FIG. Can be used which is narrower than the width of the heat seal resin layer 16c.
[0019]
Alternatively, as shown in FIG. 5, the aluminum foil 17b, which has been slit and cut in advance to have a width smaller than the width of the heat-sealable resin layers 17c on the front and back sides to be laminated, is extruded or the like, so that the aluminum foil 17b is used as an intermediate layer, The laminated film 17 composed of the resin layer 17c can be prepared and used.
[0020]
The aluminum foil constituting the rectangular films 2 and 13 may be soft or hard. Further, a degreasing treatment or a base treatment may be performed. The aluminum foil preferably has a thickness of 20 to 40 μm. Since the battery package in the present invention is a pillow-packaged container, the thickness of the aluminum foil can be reduced, and a battery having a thickness of about 20 μm is most preferable. Thereby, weight reduction and thickness reduction can be achieved. Further, as a metal foil other than the aluminum foil, a metal foil such as an aluminum alloy and titanium can be used.
[0021]
Examples of the material of the resin layer constituting the rectangular film include polyethylene, polypropylene, polyethylene terephthalate, and a conventionally known resin such as a heat-resistant biaxially stretched film (for example, a nylon biaxially stretched film). Any material may be used as long as it is a thermoplastic polymer material.
[0022]
Examples of the material of the heat seal resin layer constituting the rectangular film include polyethylene and ethylene-based copolymer, polypropylene and propylene-based copolymer, polyvinyl alcohol, and ethylene-vinyl alcohol copolymer. Any material may be used as long as it is a known thermoplastic polymer material having heat sealing properties.
[0023]
The base material of the tape 3 used in the present invention is such that the aluminum foil shown in FIGS. 4 (b) and 5 is used as an intermediate layer, and the front and back are formed from the heat-sealing resin layer. The resulting rectangular laminated film can be used as a tape base as it is. The method of making the width of the aluminum foil layer constituting the tape smaller than the width of the heat-sealable resin layer on the front and back is the same as in the case of the laminated film of the rectangular film described above, and the aluminum foil is used as the intermediate layer in advance, After creating a laminated film consisting of the front and back heat-sealing resin layers, the end face of the aluminum foil is subjected to an etching method, or, in advance, extruding an aluminum foil that has been slit and cut narrower than the width of the heat-sealing resin layer to be laminated. A laminated film for a tape can also be prepared by laminating by processing or the like.
[0024]
As the aluminum foil constituting the tape 3 used in the present invention, the same material as that used in the laminated film of the rectangular film can be used, and it may be soft or hard. Further, a degreasing treatment or a base treatment may be performed. The aluminum foil preferably has a thickness of 20 to 40 μm. Since the battery package in the present invention is a pillow-packaged container, the thickness of the aluminum foil can be reduced, and a battery having a thickness of about 20 μm is most preferable. .
[0025]
Further, as the material of the heat-sealable resin layer constituting the tape 3 used in the present invention, the same material as that used in the laminated film of the rectangular film can be used, and polyethylene and ethylene-based copolymer, Examples include polypropylene and propylene-based copolymers, polyvinyl alcohol, and ethylene-vinyl alcohol copolymer.
[0026]
The material constituting the battery to be housed and sealed in the battery package of the present invention is not particularly limited. For example, a non-aqueous electrolyte secondary having a structure in which a positive electrode, a negative electrode, and an electrolyte are sealed in an encapsulation bag, and having a structure in which lead wires of the positive electrode and the negative electrode are respectively taken out to the outside, and a highly reliable structure of the electrolyte being sealed A battery, a thin lithium-ion secondary battery (polymer battery) composed of an anode connected to an anode terminal using a conductive polymer as a solid electrolyte and connected to an anode terminal with the solid electrolyte interposed, It is possible to provide a battery package housing and enclosing a lithium secondary battery or the like formed by laminating an impregnated spacer with a flat plate.
[0027]
The battery package of the present invention, which contains battery constituent materials therein and is used for forming a battery, can be molded using a normal pillow packaging machine.
First, the wound rectangular plastic laminated film is continuously folded by a bag making machine (former) of a pillow wrapping machine, and the two opposing sides at both ends are butted, and a tape is laid on the butted inside. After sealing, or by overlapping and sealing the two opposing sides at both ends to form a cylinder, forming a bag with one of them sealed, inserting the battery constituent material, and disposing the electrode terminals at predetermined positions The end of the opening of the bag is sealed by heat sealing to obtain the battery package of the present invention.
[0028]
In the battery package of the present invention composed of a composite material of a metal and a resin, such as an aluminum foil, the configuration in which the aluminum foil is not exposed allows the contained battery component material to have, for example, excellent resistance to contents such as an electrolyte substance. Therefore, since the metal does not corrode and peeling between the metal and the resin does not occur, a highly durable battery package can be provided.
In addition, the conventional deep-drawing process composed of a composite material of metal and resin is performed, and a flat lid material is placed on a tray-shaped container body with a flange formed by press molding. In comparison, since the aluminum foil can be made thinner, it is possible to achieve a reduction in thickness and weight and to reduce costs.
Furthermore, while the above-mentioned battery container is formed by deep drawing and press forming, the battery package of the present invention is formed by pillow packaging, so that it is excellent in production efficiency and can be obtained at low cost.
[0029]
【The invention's effect】
According to the present invention, in the case where the battery package is made of a composite material of a metal and a resin such as aluminum foil for the purpose of thinning, the battery layer material to be stored inside without exposing the metal layer from the container. A flexible battery package having excellent durability and excellent durability can be provided.
In addition, since the aluminum foil can be made thinner than a conventional battery container or the like, it is possible to achieve a reduction in thickness and weight and to reduce costs.
Further, as compared with a battery container or the like obtained by performing conventional deep drawing and press forming, the battery package of the present invention is formed by pillow packaging, so that it has excellent production efficiency and low cost. Is obtained.
Furthermore, in the case of normal pillow packaging, the thickness of the sealing portion is the thickness of three sheets of the base film to be used, whereas the structure of the battery package of the present invention allows the base material to be used. Since the thickness can be set to be equal to the thickness of two films, it can contribute to reduction in thickness and weight.
[Brief description of the drawings]
FIG. 1 shows an example of a battery package of the present invention, in which (a) is a schematic perspective view of the battery package. (B) is an AA 'schematic sectional view of the battery package shown in (a).
FIG. 2 shows another example of the battery package of the present invention, and (a) is a schematic perspective view of the battery package. (B) is an AA 'schematic sectional view of the battery package shown in (a).
FIG. 3 is a cross-sectional view showing an example of a laminated film substrate used for the battery package of the present invention.
FIG. 4 is an explanatory diagram for explaining an etching treatment of a laminated film substrate or a tape substrate used in the battery package of the present invention.
FIG. 5 is a cross-sectional view showing another example of a laminated film substrate or a tape substrate used for the battery package of the present invention.
FIG. 6 is a cross-sectional view showing an example of a laminated film substrate used for a conventional battery package.
FIG. 7 is a cross-sectional view showing an example of a conventional battery container.
[Explanation of symbols]
1, 12 ... battery package 2, 13, 15, 16, 17, 31 ... plastic laminated film substrate 2a ... resin layers 2b, 13b, 16b, 17b, 18b ... aluminum foil layer 2c, 13c, 16c, 17c, 18c Heat-seal resin layer 3 Tapes 4, 5, 6, 7 Heat-sealed seal portions 8, 9 Electrode terminals 10 Gap portions 11 ··· Battery constituent material content 14 ··· Laminated thermal adhesive seal portion 16 '··· Etched plastic laminated film base material 16b' · · · Etched aluminum foil layer 18a ··· -Biaxially stretched nylon film layer 18d-Heat-resistant protective layer 19-Tray-shaped container body 20-Lid

Claims (3)

In a battery package used for forming a battery, containing a battery constituent material therein,
A battery package body formed by folding a rectangular film, butting two opposing sides at both ends, sealing and overlapping tape on the butted inside, and sealing a taped pillow to seal the cylindrical opening. The square film, an aluminum foil as an intermediate layer, the surface layer is a resin layer and the innermost layer is a heat seal resin layer, and the tape is an aluminum foil as an intermediate layer, the front and back are heat seal resin layers, and The width of the aluminum foil formed on the tape is smaller than the width of the heat-sealable resin layer on the front and back, and the tape is placed inside the square film butted so that the aluminum foil is not exposed on the end faces of both sides of the tape. A battery package characterized by being overlapped and sealed by heat fusion. In a battery package used for forming a battery, containing a battery constituent material therein,
A battery package body obtained by folding a rectangular film, overlapping and sealing two opposing sides at both ends, and sealing the opening formed into a cylindrical shape by pillow packaging with an envelope, wherein the rectangular film is formed of aluminum foil. As an intermediate layer, at least the front and back of the aluminum foil are made of a heat-sealing resin layer, and the inside of the front and back heat-sealing resin layers so that the end surface of the aluminum foil inside the back seal portion to be enveloped is not exposed. A battery package, wherein a heat-sealing resin layer on the front and back of an aluminum foil is sealed by being overlapped and sealed by heat fusion. 2. The battery package according to claim 1, wherein the tape is overlapped and sealed by heat fusion so that at least the aluminum foil layer of the tape covers the gap formed by abutting both ends of the rectangular film. body.

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