JP2001291497A - Manufacturing method of polymer battery armoring body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of forming a stable armoring body, in which no crack or crease is generated on a laminated body when bending it during a formation of a polymer battery armoring body. SOLUTION: In a polymer battery armoring body, a laminated body composed of at least a base material layer, a barrier layer, and a heat seal layer, is utilized and folded into two, then a main body of a polymer battery is housed, and the sides other than the bended sides are heat sealed. In a manufacturing method of the polymer battery armoring body, a press rule is previously set at the bending position by pressing a line projection. The heated line projection can be used instead.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polymer battery outer package having a liquid or solid organic electrolyte (polymer polymer electrolyte) having moisture resistance and content resistance.

[0002]

2. Description of the Related Art A polymer battery, also called a lithium secondary battery, is a battery having a polymer electrolyte and generating an electric current by the movement of lithium ions, wherein the positive and negative electrode active materials are made of a polymer. Is included.
The structure of the lithium secondary battery is as follows: a positive electrode current collector (aluminum, nickel) / a positive electrode active material layer (a metal positive electrode material such as metal oxide, carbon black, metal sulfide, electrolyte solution, polyacrylonitrile) / an electrolyte layer (propylene) Carbonate-based electrolytes such as carbonate, ethylene carbonate, dimethyl carbonate, and ethylene methyl carbonate; inorganic solid electrolytes composed of lithium salts; gel electrolytes) / Negative electrode active materials (lithium metals, alloys, carbon, electrolytes, and polymers such as polyacrylonitrile) A negative electrode material) / a negative electrode current collector (copper, nickel, stainless steel) and an outer package that wraps them. Applications of polymer batteries include personal computers, mobile terminals (mobile phones, PDAs, etc.), video cameras, electric vehicles, storage batteries for energy storage, robots,
Used for satellites. As an outer package of the polymer battery, a metal can formed by pressing a metal into a cylindrical or rectangular parallelepiped container, or a laminate formed of a base material layer, aluminum, and a sealant layer is formed in a bag shape. Was used. The outer package includes a pouch type that is a three-sided seal or a four-sided seal bag that bends the laminate as it is and heat seals the periphery, and an embossed type that press-molds at least one side and heat seals the periphery. is there.

[0003]

However, there have been the following problems as the exterior body of the polymer battery. In a metal can, the shape of the battery itself is determined because the outer wall of the container is rigid. Therefore, since the hardware side is designed to match the battery, the size of the hardware using the battery is determined by the battery, and the degree of freedom of the shape is reduced. The packaging material for a polymer battery forms an exterior body for wrapping the polymer battery body, and there are a pouch type and an embossed type depending on the type of the exterior body. And as a packaging material for a polymer battery, it is generally a laminate comprising at least a base material layer, a barrier layer, and a heat seal layer. Regardless of the pouch type or the emboss type, sealing by heat sealing of the periphery must be ensured. Further, it has been confirmed that the adhesive strength between the layers affects the properties required for the outer package of the polymer battery. For example, if the adhesive strength between the barrier layer and the heat seal layer is insufficient, it causes moisture to enter from the outside, and hydrogen fluoride generated by the reaction between the electrolyte and the electrolyte in the components forming the polymer battery The aluminum surface is corroded by the acid, and delamination occurs between the barrier layer and the heat seal layer.
The pouch type includes a bag type such as a three-sided seal, a four-sided seal and a pillow type, and the embossed type includes a concave portion formed on one side or a concave portion formed on both sides to accommodate a polymer battery main body. In some cases, the four sides of the periphery may be heat sealed. The pouch,
In the emboss type, there is an outer package having a folded portion as a bag-making type. In the case of the pouch type and the emboss type, in the case of an emboss type exterior body including a bent portion as shown in FIG. 7A or a pouch type exterior body as shown in FIG. There is a possibility that cracks may occur in the portion of the folded portion 9, particularly in the inner surface layer, and the rigidity of the laminated body is so strong that it is difficult to bend and wrinkles may occur in bag making. As a result, the electrolyte may enter from the cracked portion, delamination may occur between the barrier layer and the resin layer adhered to the barrier layer, and may hinder the performance as a polymer battery. there were. In addition, wrinkles at the time of bending may cause a seal to come off (pinhole). An object of the present invention is to provide a method for forming a stable exterior body without generating cracks, wrinkles and the like in a laminate at the time of bending when forming the exterior body of a polymer battery.

[0004]

The above objects can be attained by the present invention described below. At least, by bending using a laminate comprising a base layer, a barrier layer, and a heat sealing layer, when manufacturing an exterior body of a polymer battery, the bending position is previously pressed by pressing a linear projection. A method for manufacturing a polymer battery outer package, comprising providing a creasing rule, including using a heated linear projection.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention provides a moisture-proof property,
Further, it is a polymer battery packaging material having good productivity and in which cracks are less likely to occur in the heat seal layer. The layer configuration and the manufacturing method of the laminate will be described in more detail with reference to the drawings and the like. FIG. 1 is a view for explaining a polymer battery having an embossed type exterior body manufactured by the method for manufacturing a polymer battery exterior body of the present invention, wherein (a) a perspective view of the polymer battery, and (b) a polymer battery main body. FIG. 3 is a perspective view showing a state of being stored, (c) a cross-sectional view of a part X ₁ -X ₁ , and (d) an enlarged view of a part Y 1. FIG. 2 is a view for explaining a polymer battery having a pouch-type exterior body manufactured by the method for manufacturing a polymer battery exterior body of the present invention, wherein (a) a perspective view of the polymer battery, and (b) a polymer battery main body. It is a perspective view which shows the state accommodated, (c) It is a development view of an exterior body. FIG. 3 is a diagram illustrating a polymer battery having another pouch-type outer package manufactured by the method for manufacturing a polymer battery outer package of the present invention, wherein (a) is a perspective view of the polymer battery, and (b) is a polymer battery. It is a perspective view which shows the state which accommodates a main body, (c) It is a development view of an exterior body. FIG. 4 is a conceptual diagram illustrating an embodiment of a method for forming a creasing line by the method for manufacturing a polymer battery outer package of the present invention. FIG. 5 is a cross-sectional view illustrating a layer configuration of a laminate forming a packaging material for a polymer battery. FIG. 6 is a perspective view illustrating a method of mounting an adhesive film in bonding a packaging material for a polymer battery to a tab.

[0006] As a packaging material for polymer batteries, for example, a laminate having a configuration such as nylon / adhesive layer / aluminum / adhesive layer / heat seal layer is formed by sandwich lamination, dry lamination, co-extrusion lamination, heat lamination, etc. Is formed. By using the laminate as described above, an exterior body of a pouch or emboss type polymer battery is formed. The outer package of the polymer battery must be surely packed in a moisture-proof package. However, in forming the outer package, since the outer dimensions of the polymer battery need to be as small as possible, the edge forming the sealing system may be a half-folded edge. For example, in the case of the emboss type, as shown in FIG.
The edge 9 ′ may be a folded edge as the folded portion 9. Also, in the pouch type, for example, as shown in FIG.

[0007] In the formation of such an exterior body having a two-folded portion, conventionally, in a folded portion of a bag making machine or a packaging machine, the package is folded at a location called a guide plate or a former. In some cases, a repulsive force due to the stiffness of the stiffness acts to cause wrinkles in the folded portion. In addition, stress is applied to the folded portion of the laminate, particularly the heat seal layer, for a long period of time, and as a result, cracks are generated, and the electrolyte of the polymer battery penetrates from the cracks and adheres to the barrier layer (aluminum) and aluminum. In some cases, this may cause delamination with the resin layer.

Therefore, the present inventors consider that the half-fold state 2
As a result of diligent research on a method that does not generate wrinkles in the folding process and that does not generate cracks in the folded portion without applying excessive stress to the folded portion, as a result of intensive research, The present inventors have found that the above problem can be solved by providing a pressing rule in advance, and have completed the present invention.

In the method for manufacturing a polymer battery outer package according to the present invention, for example, as shown in FIG. 4, a laminate 5 is inserted between a male mold 31 and a female mold 32, and The pressing rule 8 can be formed by pressing the male mold 31 against the laminate 5. As the pressing rule provided in the case of the outer body of the polymer battery, the width of the rule is 0.1 to
1.0 mm, the depth of the rule is in the range of 0.01 to 1.0 mm, and the dimensions of the male and female parts for providing such a rule are w ₁ = 0.1 to 5. 0 mm, w ₂ = 0.0
A range of 5 to ₃ is appropriate. By heating the male die 31 and / or the female die 32 when forming the score 8, the shape of the obtained score 8 is further stabilized. As a result of various experiments, when forming a creasing pattern on the polymer battery packaging material,
The range of 50 ° C to 150 ° C was appropriate for both male and female types. In the present invention, either male or female heating may be used. In addition, the pressure is 0.1-10M per piece
The range of Pa is appropriate.

Next, the materials and laminates constituting each layer of the laminate forming the packaging material for a polymer battery according to the present invention will be described.

The structure of the laminate used in the method for producing a polymer battery package of the present invention is as shown in FIG.
It comprises at least a base material layer 11, a barrier layer 12, and a heat seal layer 14, and the respective layers are laminated by a method such as dry lamination, heat lamination, sandwich lamination, and coextrusion lamination.

The base material layer 11 is made of a stretched polyester or nylon film. At this time, as the polyester resin, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, copolymerized polyester, polycarbonate and the like are used. No. As the nylon, a polyamide resin, that is, nylon 6, nylon 6,6,
Copolymer of nylon 6 and nylon 6,6, nylon 6,10, polymethaxylylene adipamide (MXD6)
And the like.

When the base material layer 11 is used as a polymer battery, it is a portion that comes into direct contact with the hardware.
Basically, a resin layer having an insulating property is preferable. In consideration of the presence of pinholes in the film alone, the occurrence of pinholes during processing, and the like, the base material layer needs to have a thickness of 6 μm or more, and the preferred thickness is 12 to 25 μm.

In the present invention, the base material layer 11 can be laminated to improve the pinhole resistance and the insulation when the battery is used as an outer package. When the base layer is formed into a laminate, the base layer includes at least one resin layer of two or more layers, and each layer has a thickness of 6 μm or more, preferably 12 μm or more.
２５25 μm. Although not shown, examples of laminating the base material layer include the following 1) to 7). 1) Stretched polyethylene terephthalate / stretched nylon 2) Stretched nylon / stretched stretched polyethylene terephthalate Also, mechanical suitability of the packaging material (stability of transportation in packaging machines and processing machines), surface protection (heat resistance, electrolyte resistance) ) When the embossing type is used for the exterior body for a polymer battery as a secondary processing, the base layer is formed for the purpose of reducing the frictional resistance between the mold and the base layer at the time of embossing or when an electrolytic solution is attached. For protection, it is preferable that the base material layer is multi-layered and a fluorine-based resin layer, an acrylic resin layer, a silicone-based resin layer, a polyester-based resin layer, or the like is provided on the surface of the base material layer. For example, 3) Fluorine-based resin / stretched polyethylene terephthalate (fluorine-based resin is formed into a film or liquid coating and then dried) 4) Silicone-based resin / stretched polyethylene terephthalate (silicone-based resin is film-like or liquid 5) Fluorine resin / stretched polyethylene terephthalate /
Stretched nylon 6) Silicone resin / Stretched polyethylene terephthalate / Stretched nylon 7) Acrylic resin / Stretched nylon (Acrylic resin is cured by drying after film-like or liquid coating)

The barrier layer 12 is a layer for preventing water vapor from particularly entering the inside of the polymer battery from the outside, and stabilizes the pinhole of the barrier layer alone and the workability (pouching, embossability). And a metal such as aluminum or nickel having a thickness of 15 μm or more to have a pinhole resistance, or an inorganic compound, for example, a film obtained by depositing silicon oxide, alumina, or the like. Aluminum having a thickness of 20 to 80 μm. In order to further improve the occurrence of pinholes and to make the type of the outer package of the polymer battery an embossed type, in order to eliminate the occurrence of cracks and the like in the embossing, the present inventors made use of aluminum used as a barrier layer. The material has an iron content of 0.3-9.
By setting the content to 0% by weight, preferably 0.7 to 2.0% by weight, the aluminum has good ductility and less occurrence of pinholes due to bending as a laminate, compared to aluminum containing no iron. It has been found that the side wall can be easily formed when the embossed type exterior body is molded. The iron content is 0.3% by weight
If less than the above, no effects such as prevention of pinholes and improvement in embossability are observed, and if the iron content of the aluminum exceeds 9.0% by weight, flexibility as aluminum is impaired. As a result, the bag-making properties of the laminate deteriorate.

Further, the aluminum produced by cold rolling has its flexibility and flexibility under annealing (so-called annealing) conditions.
Although the strength and hardness of the waist change, the aluminum used in the present invention is harder than the hard treated product without annealing.
Aluminum with a tendency to soften slightly or completely annealed is preferred. The degree of flexibility, waist strength, and hardness of aluminum, that is, the conditions of annealing,
What is necessary is just to select suitably according to workability (pouching, embossing). For example, in order to prevent wrinkles and pinholes during embossing, soft aluminum annealed according to the degree of forming can be used.

The inventors of the present invention have conducted intensive studies on the object of the present invention, and as a result, have found that the barrier layer 12
By subjecting the aluminum front and back surfaces to a chemical conversion treatment, a laminate that was satisfactory as the packaging material could be obtained. The chemical conversion treatment is specifically to prevent delamination between aluminum and the substrate layer during embossing by forming an acid-resistant film such as a phosphate, a chromate, a fluoride, and a triazine thiol compound. And the hydrogen fluoride generated by the reaction between the electrolyte of the polymer battery and water, to prevent the dissolution and corrosion of the aluminum surface, especially the dissolution and corrosion of the aluminum oxide present on the aluminum surface, and Improves adhesion (wetability), prevents delamination between the base layer and aluminum during embossing and heat sealing, and prevents delamination on the inner surface of aluminum by hydrogen fluoride generated by the reaction between electrolyte and moisture The effect was obtained. As a result of studying the effect of chemical conversion treatment on the aluminum surface using various substances, among the above-mentioned acid-resistant film-forming substances, phenolic resin, chromium fluoride (3) compound, and phosphoric acid The phosphoric acid chromate treatment using the treated product was good.

The formation of the chemical conversion treatment layer 15 may be performed only on one side of the innermost layer of aluminum when the exterior body of the polymer battery is a pouch type. When the exterior body of the polymer battery is an embossed type, by providing the chemical conversion treatment layers 15 (1) and 15 (2) on both sides of aluminum, delamination between the aluminum and the base layer during embossing can be reduced. Can be prevented. A laminate having a chemical conversion treatment on both surfaces of aluminum may be used for the pouch type.

As the resin forming the heat seal layer 14 of the packaging material for a polymer battery, acid-modified polypropylene,
Acid-modified polyethylene and the like are preferred, but by using various processing methods, ozone treatment methods, post-heating methods of the laminate, etc., other than the above, the contents are excellent in protective properties, processability, heat sealability, etc. A polypropylene resin or a polyethylene resin can also be used. Examples of the polyethylene-based resin used here include medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, and high-density polyethylene. As the heat seal layer in the first production method, medium-density polyethylene or It is preferable to use linear low density polyethylene. Also,
Medium-density polyethylene or linear low-density polyethylene as the adhesive resin in the second or third manufacturing method;
As the heat seal layer, a medium density polyethylene, a linear low density polyethylene, or a film made of the same resin can be used.

As the laminate 10 of the packaging material for a polymer battery of the present invention, in addition to the base layer 11, the barrier layer 12, and the heat seal layer 14, as shown in FIG. An intermediate layer 13 made of a biaxially stretched film such as polyimide or polyethylene terephthalate may be provided between the heat seal layer 14 and the heat seal layer 14. The intermediate layer 13 is laminated for improving the strength as a packaging material for a polymer battery, stabilizing the barrier property, and preventing a short circuit due to contact between the tab and the barrier layer 12 at the time of heat sealing of the outer package of the polymer battery. .

In each of the above-mentioned layers in the laminate of the present invention,
Appropriate surface activation such as corona treatment, blast treatment, oxidation treatment, ozone treatment, etc. for the purpose of improving and stabilizing the suitability for film forming, lamination processing, and final processing of secondary products (pouching, embossing) as appropriate. Processing may be performed. Liquid paraffin may be coated at ² to 6 g / m ² to improve moldability.

In the present invention, when a heat-sealing layer having no heat-sealing property with respect to a metal is used, the heat-sealing of the tab portion in the polymer battery is performed as shown in FIG.
As shown in (a), FIG. 6 (b), and FIG. 6 (c), an adhesive having heat sealability to both the metal and the heat seal layer between the tab and the heat seal layer of the laminate. The sealing property at the tab portion is also ensured by interposing the conductive film. The adhesive film is shown in FIGS.
(E), as shown in FIG. 6 (f), the tab may be wound around a predetermined position. As the adhesive film, a film made of the unsaturated carboxy-grafted polyolefin, metal cross-linked polyethylene, or a copolymer of ethylene or propylene with acrylic acid or methacrylic acid can be used.

[0023]

EXAMPLES The method for producing a polymer battery outer package of the present invention will be specifically described with reference to examples. The following outer shapes in the examples and comparative examples have the following shapes and dimensions. (1) Pouch type The form is a three-way seal type shown in FIG.
mm, n1 = 80 mm, and the seal width of the seal portion is 5 m
m. (2) Embossed type The form is a single-sided embossed type shown in FIG.
0 mm, n2 = 55 mm, d = 3.5 mm, and the seal width of the seal portion was 5 mm. [Example 1] (Pouch type) A chemical conversion treatment was applied to both surfaces of 20 μm of aluminum, and 25 μm of nylon was bonded to one surface of the chemical conversion treatment by a dry laminating method. Is extruded to a thickness of 20 μm as an adhesive resin, a film (thickness: 30 μm) made of random polypropylene is laminated by a sandwich lamination method, and the obtained laminate is heated under a condition that the softening point is equal to or higher than the softening point of the acid-modified polypropylene. Then, at the time of bag making, a crease having a width of 1 mm and a depth of 0.5 mm was provided in the folded portion to make a bag, the polymer battery main body was housed through the opening, and the opening was heat-sealed. 1 was obtained. [Example 2] (Embossed type) A chemical conversion treatment was applied to both surfaces of aluminum 40 µm, and 25 µm of nylon was bonded to one surface of the chemical conversion treatment by dry lamination, and then the other surface subjected to the chemical conversion treatment was acid-modified polypropylene. Is extruded to a thickness of 20 μm as an adhesive resin, a film made of random polypropylene (thickness of 30 μm) is laminated by a sandwich lamination method, and the obtained laminated body is heated under a condition that is equal to or higher than the softening point of the acid-modified polypropylene, Next, the laminate was press-molded to form a recess, and the folded part was 1 m wide.
m, a crease having a depth of 0.5 mm is provided, the polymer battery main body is housed in the concave portion, and the crease is folded in two at the crease portion.
Specimen Example 2 by heat sealing the periphery other than the folded part
I got In addition, in the production of the random polypropylene film, 0.2% by weight of silica (average particle size: 10 μm) was added. [Example 3] (Pouch type) A chemical conversion treatment was applied to both surfaces of 20 μm of aluminum, and 25 μm of nylon was bonded to one surface of the chemical conversion treatment by a dry lamination method, and then the other surface subjected to the chemical conversion treatment was acid-modified polypropylene. Is extruded to a thickness of 20 μm as an adhesive resin, a film (thickness: 30 μm) made of random polypropylene is laminated by a sandwich lamination method, and the obtained laminate is heated under a condition that the softening point is equal to or higher than the softening point of the acid-modified polypropylene. Then, at the time of bag making, a folding rule having a width of 1 mm and a depth of 0.5 mm was provided in the folded part to make a bag, the polymer battery main body was housed through the opening, and the opening was heat-sealed. 3 was obtained. At the time of providing the pressing rule, the male mold was heated to ** ° C. and the female mold was heated to ** ° C., and pressurized. [Example 4] (Embossed type) A chemical conversion treatment was applied to both sides of 40 μm aluminum, and 25 μm of nylon was bonded to one surface of the chemical conversion treatment by dry lamination, and then the other surface subjected to the chemical conversion treatment was acid-modified polypropylene. Is extruded to a thickness of 20 μm as an adhesive resin, and a film (thickness: 30 μm) made of random polypropylene is laminated by a sandwich lamination method, and the obtained laminate is heated under a condition that the softening point is equal to or higher than the acid-modified polypropylene. Then, the laminate is press-molded to form a concave portion, and the folded portion has a width of 1 m.
m, a crease having a depth of 0.5 mm is provided, the polymer battery main body is housed in the concave portion, and the crease is folded in two at the crease portion.
Specimen Example 4 by heat-sealing the periphery other than the folded part
I got At the time of providing the pressing rule, the male mold was heated to ** ° C. and the female mold was heated to ** ° C., and pressurized. In addition, in the formation of the random polypropylene film, 0.2% by weight of silica (average particle size: 10 μm) was added. [Comparative Example 1] A chemical conversion treatment was applied to both surfaces of 20 μm of aluminum, 25 μm of nylon was bonded to one surface of the chemical conversion treatment by a dry lamination method, and then, the other surface of the chemical conversion treatment was coated with an acid-modified polypropylene as an adhesive resin. , 2
Extruded to a thickness of 0 μm, a film made of random polypropylene (thickness: 30 μm) was laminated by a sandwich lamination method, and the obtained laminate was heated under the condition that the softening point was equal to or higher than the acid-modified polypropylene. Is folded into a bag, the main body of the polymer battery is housed through the opening, and the opening is heat-sealed to obtain a sample comparison example 1.
I got [Comparative Example 2] A chemical conversion treatment was applied to both surfaces of 40 μm aluminum, and 25 μm of nylon was bonded to one surface of the chemical conversion treatment by a dry laminating method. 20
The sample was extruded to a thickness of μm, a film (thickness: 30 μm) made of random polypropylene was laminated by a sandwich lamination method, and the obtained laminate was heated under the condition that the softening point was equal to or higher than the acid-modified polypropylene. I got In addition, in the production of the random polypropylene film, 0.2% by weight of silica (average particle size: 10 μm) was added.

<Pouching, embossing, and packaging> As described above, Examples 1, 3, and Comparative Example 1 are pouch-type, Examples 2, 4, and Comparative Example 2 are polymers as emboss-type. The battery body was housed and sealed.

<Evaluation Method> The presence or absence of wrinkles in the folded part after packing was confirmed, and as a storage condition, a carbonate-based solvent containing a lithium salt added to each sample under each of the above-mentioned conditions was sealed, and the temperature was maintained at 60 ° C. After storing in a 90% RH constant temperature bath for 7 days, the presence or absence of delamination on the bonding surface between the aluminum and the bonding base resin layer was confirmed. .

<Results> In Examples 1 to 4, pouches were used.
No wrinkles or delaminations were seen with any type of embossing. The pressing rule obtained in Example 3 and Example 4 had a sharper locking portion (28) shape than the pressing rule provided in Example 1 and Example 2, and the effect of heating the mold was recognized. In Comparative Example 1, 100
Wrinkles were generated in the seals at both ends of the folded portion in 30 samples, and delamination was observed in 20 samples out of 100. In Comparative Example 2, 75 samples in 100 were sealed at both ends of the folded portion. Wrinkles in the part, 100
There was no delamination in pouching in which delamination was observed in 30 of the samples, but all delamination occurred in the content resistance.

[0027]

According to the present invention, by forming a crease in the half-folded portion by the method for manufacturing a polymer battery outer package according to the present invention, the occurrence of wrinkles in the half-folded portion of the obtained outer package can be prevented. Since the occurrence of stress cracks was reduced, the content-side delamination of the aluminum surface could be prevented, and an excellent exterior body could be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a polymer battery having an embossed type outer package manufactured by a method for manufacturing a polymer battery outer package of the present invention, wherein (a) a perspective view of the polymer battery;
(B) A perspective view showing a state in which the polymer battery main body is housed.
(C) X ₁ -X ₁ part cross-sectional view, an enlarged view (d) Y ₁ parts.

FIG. 2 is a view for explaining a polymer battery having a pouch-type exterior body manufactured by the method for manufacturing a polymer battery exterior body of the present invention, wherein (a) is a perspective view of the polymer battery, and (b) is a perspective view of the polymer battery;
A perspective view showing a state where a polymer battery main body is housed, (c)
It is a development view of an exterior body.

FIG. 3 is a diagram illustrating a polymer battery having another pouch-type outer package manufactured by the method for manufacturing a polymer battery outer package of the present invention, wherein (a) is a perspective view of the polymer battery, and (b) is a polymer battery. It is a perspective view showing the state where a battery main part is stored, and is a development view of (c) exterior.

FIG. 4 is a conceptual diagram illustrating an example of a method for forming a creasing line by a method for manufacturing a polymer battery outer package according to the present invention.

FIG. 5 is a cross-sectional view illustrating a layer structure of a laminate forming a packaging material for a polymer battery.

FIG. 6 is a perspective view illustrating a method of mounting an adhesive film in bonding a packaging material for a polymer battery and a tab.

FIGS. 7A and 7B are diagrams illustrating a pouch-type polymer battery packaged by a two-folded outer package, wherein FIG. 7A is a perspective view of the polymer battery, FIG. c) X ₂ -X ₂ parts cross-sectional view, (d) X ₃ -
X ₃ parts is a cross-sectional view.

FIGS. 8A and 8B are diagrams illustrating an embossed polymer battery packaged by a two-folded outer package, wherein FIG. 8A is a perspective view of the polymer battery, FIG. c) X ₄ -X ₄ parts cross-sectional view, (d) X ₅
-X ₅ parts is a cross-sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polymer battery 2 Polymer battery main body 3 Cell (power storage part) 4 Tab (electrode) 5 Outer body 6 Sealing part 7 Concave part 8 Crimp 9 Folded part 10 Laminated body (packaging material for polymer batteries) 11 Base material layer 12 Aluminum ( (Barrier layer) 13 Intermediate layer 14 Heat seal layer 15 Chemical conversion layer 16 Adhesive layer 17 Ozone treated surface 20 Press forming part 21 Male type 22 Female type 23 Cavity 30 Pressing device 31 Male type 32 Female type 40 Adhesive film

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Fukuda 1-1-1 Ichigaya Kagacho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. (reference) 5H011 AA01 BB04 CC02 CC06 CC10 CC06 DD06

Claims (2)

[Claims] 1. A polymer battery which is folded in two using a laminate comprising at least a substrate layer, a barrier layer, and a heat seal layer to house a polymer battery main body and heat-seal and seal the sides other than the folded sides. A method for manufacturing a polymer battery exterior body, comprising: providing a pressing rule by previously pressing a linear projection at a position to be bent when manufacturing the exterior body. 2. The method according to claim 1, wherein a heated linear projection is used.