JP2003331798A - Cladding film for sealing electrode body and sealing method of cladding film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To seal airtightly an electrode body by well bonding opposing end edge part of a cladding film. <P>SOLUTION: An electrode body 10 is arranged between a top and a bottom pair of cladding films 20, each end part of the pair of cladding films are positioned, an external power source 30 is put on to have a heating element 22 of the cladding films 20, and a bonded part of a hot welding resin layer opposing the pair of the cladding films 20, and at the same time, is pressurized from top and bottom by a pressurizer, and the end part of the cladding films 20 is sealed by hot welding the hot welding resin layer. After the hot welding of the end part where the heating element 22 is fitted is finished, a positive electrode outer terminal 12, a negative electrode outer terminal 14 and a sealing part 24 are airtightly sealed with the use of a hot pressing tool so as to lead out the both outer terminals 12, 14. Later, connection of the heating element 22 and the power source 30 are cut off in the vicinity of the end part of the cladding films 20. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging material film for sealing an electrode body and a sealing method for the packaging material film, and more particularly to a packaging material film having a good adhesive sealing state and a sealing method therefor.

[0002]

2. Description of the Related Art A portable terminal (PDA) such as a mobile phone.
The secondary battery used for is required to have higher capacity, smaller size, and lighter weight. Examples of this secondary battery include a lead storage battery, a nickel-cadmium secondary battery, a nickel-hydrogen secondary battery, and a lithium-ion secondary battery, but in recent years, interest in thin batteries that can further reduce weight has increased. There is.

In the thin battery described above, the positive electrode layer, the polymer electrolyte layer, and the negative electrode layer are superposed and integrated into a sheet by thermocompression bonding, and the positive electrode layer and the negative electrode layer each have a positive electrode external terminal and a negative electrode external. A polymer electrolyte secondary battery, in which terminals are electrically connected and sealed with an exterior material film so that these external terminals are led out, is being developed.

In the above polymer electrolyte secondary battery, the positive electrode layer comprises a carbonaceous material which absorbs and releases lithium ions (for example, polyaniline, polyacene, carbon powder).
A positive electrode sheet or a current collector for a positive electrode sheet containing a lithium cobalt composite oxide LiCoO ₂ . The negative electrode layer is a lithium metal, carbonaceous or lithium alloy sheet containing an active material capable of inserting and extracting lithium ions, and a collector thereof. Furthermore, the polymer electrolyte layer has a separator function of a positive electrode layer and a negative electrode layer and further has electrolyte retention, for example, polyvinylidene fluoride impregnated with a non-aqueous electrolytic solution containing a lithium salt as an electrolyte, etc. Polymers of Then, for example, a thermoplastic resin such as a polyamide resin is used as the exterior packaging material film, and the opposite edge portions of the exterior packaging material film are heat-welded by heating and pressing so that the positive electrode external terminal and the negative electrode external terminal described above are led out. Then, the polymer electrolyte secondary battery was manufactured.

For example, as shown in FIG. 10, a pair of exterior material films 70 are arranged so as to sandwich the electrode body 10 in which a positive electrode layer, a polymer electrolyte layer and a negative electrode layer are integrally formed in a sheet shape. To do. Next, using the positioning type heating type pressurizing tool, first, the opposing edges of one side of the pair of exterior packaging material films 70 are heat-welded along the three-dot broken line a.
Next, the heating pressurizer is positioned, the opposite end edges of the opposite sides are heat-welded along the three-dot broken line b, and the positive electrode external terminal 12 and the negative electrode external terminal 14 are further led out along the three-dot broken line c. The opposite end edges are heat-welded while being finally
A battery was manufactured by sealing the electrode body 10 with the outer packaging material film 70 by heat-welding the opposite end portions along the above.

Alternatively, a method of manufacturing a battery by covering the electrode body with a sheet of exterior material film so as to wrap it, and positioning the heating type pressurizing tool on the remaining three sides in the same manner as described above to heat-weld the opposite end portions. Has also been proposed (Japanese Patent Laid-Open No. 2000-35349).
8 publication).

[0007]

However, when the electrode body 10 is sealed by the pair of exterior material films 70,
Depending on the thickness of the electrode body 10, as shown in FIG. 11, it is difficult to align the opposing edge portions 70a and 70b of the exterior packaging material film 70, and the opposing edge portions 70a and 70b may be wavy. In such a state, if the opposing end edge portions 70a and 70b of each side of the packaging material film are heat-welded by using a conventional heating type pressurizing tool, heating by the heating type pressuring tool becomes uneven. As a result, it is difficult to uniformly heat and sufficiently melt the thermoplastic resin of the exterior packaging material film, and wrinkles may occur at the bonded portions of the facing edge portions 70a and 70b, or unbonded portions may occur. there were.

Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide an exterior material film and a method for sealing the exterior material film in which the exterior material film has a uniform molten state and improves the heat-sealed state. To do.

[0009]

In order to achieve the above object, the packaging material film for sealing the electrode body of the present invention has the following features.

(1) An exterior for sealing an electrode body having a heat-welding resin layer, a heating element arranged for melting the heat-welding resin layer, and an external heat source for heating the heating element. It is a material film.

Since the heat-welding resin in the portion where the heating element is arranged can be heated and melted by the heating element, the adhesive surface of the exterior material film can be uniformly heat-welded. This makes it possible to manufacture a battery having improved sealing characteristics.

(2) The packaging material film according to (1) above, further comprising a protective film layer and a metal foil layer formed between the protective film layer and the heat-welding resin layer, It is an exterior material film that seals an electrode body having a laminate structure.

Since the protective film layer is formed on the outer side of the exterior material film when the electrode body is sealed with the exterior material film, the corrosion resistance and rust prevention of the battery are improved. Furthermore, by stacking the metal foil layer on the exterior material film, the film has physical strength even if it is a thin film, and the heat dissipation of the battery can be further improved.

(3) In the exterior material film as described in (1) or (2) above, the external heat source is an external power source, and the heating element seals an electrode body that is heated by electric resistance. It is an exterior material film.

By using a heating element that generates heat by electric resistance, a desired portion of the heat-welding resin layer of the packaging material film can be heated easily and uniformly. Thereby, the exterior material film can be adhered to hermetically seal the electrode body.

(4) Any one of (1) to (3) above
In the packaging material film described in [1], the heating element is a packaging material film that seals the electrode body arranged in the heat-welding resin layer.

Thus, the heat-welded portion of the heat-welded resin layer can be selectively melted, and can be heated efficiently and uniformly to hermetically seal the exterior material film.

Further, the method of sealing an exterior material film of the present invention has the following features.

(1) A step of disposing an electrode body having an external terminal between a pair of exterior material films having a heat-welding resin layer in which a heating element connected to an external heat source is disposed on at least three sides, There is a melting step of causing the heating element to generate heat by a heat source to melt the heat-welded resin layer, and a pressing step of pressing the facing edge portions of the pair of exterior material films with a pressing device, and leading out the external terminal. Meanwhile, it is a method of sealing an exterior material film, wherein the opposite end edges of the pair of exterior material films are hermetically sealed by heat welding.

Since the heating elements are arranged on at least three sides except for the portion where the external terminals are led out, at least three sides are heated uniformly, and the heat-welding resin layer in the exterior material film can be melted uniformly. it can. Further, since the heat-welding resin layer is uniformly melted, good adhesion and sealing can be performed without causing wrinkles or non-adhesion even when the opposing edge portion is pressed by the pressurizer. This further improves the durability of the battery.

(6) An external terminal is provided between a bag-shaped exterior material film having a heat-welding resin layer in which a heating element connected to an external heat source is arranged on at least one side and at least other adjacent two sides are pre-sealed. A step of disposing an electrode body having: a melting step of causing the heat generating element to generate heat by the external heat source to melt the heat-welding resin layer; and a presser for pressing at least two opposite edges of the pair of exterior material films. And a pressing step of pressing the outer packaging material film with the external terminals, while hermetically sealing the opposite end edges of the pair of packaging material films by heat welding while leading out the external terminals.

The electrode body is arranged in the bag-shaped exterior material film in which at least two sides are sealed in advance, and the opposing end edges uniformly heated by using the heating element arranged on the remaining at least one side are provided with a pressurizer. By heat-sealing by using it, the process of heat-welding by alignment can be simplified and airtight sealing can be achieved.

(7) The method for sealing an exterior material film according to (5) or (6) above, wherein the melting step and the pressing step are performed simultaneously.

By performing the melting step and the pressing step at the same time, the portions of the heat-welding resin layer that have been melted by heating can be immediately pressed and adhered to each other, so that a more airtight seal can be achieved.

(8) Any one of (5) to (7) above
In the method for sealing an exterior material film described in [1], the external heat source is an external power source, and the heating element is a method for sealing the exterior material film that generates heat due to electric resistance.

By using a heating element that generates heat by electric resistance, a desired portion of the heat-welding resin layer of the packaging material film can be heated easily and uniformly. Thereby, the exterior material film can be adhered to hermetically seal the electrode body.

(9) Any one of (5) to (8) above
A battery manufactured by using the method for sealing an exterior material film described in 1.

Since the battery is more hermetically sealed,
The durability of the battery is further improved.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below.

Embodiment 1. A packaging material film for sealing the electrode body of the present embodiment and a method for sealing the packaging material film will be described with reference to FIGS. 1 to 3.

[Exterior Material Film] FIG. 1 shows a top view of the state in which the electrode body 10 is arranged on one of the pair of exterior material films 20 as viewed from above. As shown in FIG. 1, each of the pair of exterior material films 20 has a series of heating elements 22 on at least three side end portions of the electrode body 10 excluding the positive electrode external terminal 12, the negative electrode external terminal 14 and the seal portion 24 therebetween. Is wired. And the heating element 22
Is a resistor that is electrically connected to a power source 30 arranged outside and generates heat due to electrical resistance, such as a nichrome wire.

The exterior material film 20 has a laminate structure in which a metal foil layer is provided between the heat-welding resin layer and the protective film layer, as will be described later. When sealing the electrode body 10, the heat-welding resin layer is directed toward the electrode body 10 side,
The protective film layer is arranged so as to face outward.

[Method for Sealing Exterior Material Film] Next, a method for hermetically sealing the electrode body 10 between the pair of upper and lower exterior material films 20 will be described. First, to dispose the electrode body 10 between the pair of exterior material films 20 and align the ends of the pair of exterior material films 20 to heat the heating elements 22 of the pair of exterior material films 20. Then, each external power source 30 is turned on. As a result, the bonded portions of the heat-welding resin layers facing each other of the pair of exterior packaging material films 20 are heated. Next, as shown in FIG. 2, the dies 40a and 40b of the pressurizer are aligned with the opposing edge portions of the exterior packaging material film 20 and pressure is applied to heat-bond the opposing heat-welding resin layers to form the exterior packaging material. The edges of the film 20 are sealed. Here, in the case of adhering the heat-welding resin layer, the heating element 22 may be heated by the power source 30 and then pressurized by a pressurizing device, or the heating element 2 by the power source 30.
At the same time as the heat generation of 2, the pressure may be applied by a pressurizer for heat welding. Further, the pressurizer may pressurize each side, or may be a pressurizer having a mold capable of pressurizing three sides at once.

After the heat welding of the end portion provided with the heating element 22 is completed, the positive electrode external terminal 12 and the negative electrode external terminal 14 are formed.
The sealing portion 24 is hermetically sealed so that both the external terminals 12 and 14 can be led out by using a heating and pressurizing tool as in the conventional case. After that, the connection between the heating element 22 and the power source 30 is cut off at the position shown by the two-dot chain line in FIG. 1, that is, in the vicinity of the end of the exterior packaging film 20. This makes it possible to manufacture a battery in which the electrode body 10 is hermetically sealed with the pair of exterior packaging material films 20 as shown in FIG.

In the present embodiment, the heating element 22 is left in the sealed portion of the exterior packaging film 20. For example, as described above, when a nichrome wire is used as the heating element 22, since it functions as a reinforcing material for the sealing portion, damage due to physical impact can be prevented, and the durability of the battery can be further improved. You can

Further, in the present embodiment, the seal portion 24 shown in FIG. 1 is sealed by using an ordinary heating type pressurizing tool. The sealing of the sealing portion 24 is more likely to have a weaker heat-welding strength than other sealing portions. For example, if the electrode body 10 in the battery is abnormal, the sealing portion 24 is broken. It is possible to easily take out and repair the electrode body 10 inside.

Embodiment 2. A packaging material film for sealing the electrode body of another embodiment and a method for sealing the packaging material film will be described with reference to FIGS. 4 and 5.

[Exterior Material Film] FIG. 4 is a top view of the electrode body 10 arranged on one of the pair of exterior material films 40 as seen from above. As shown in FIG. 4, in each of the pair of exterior packaging material films 40, a series of heating elements 22 are wired at least at three side edges of the electrode body 10 excluding the positive electrode external terminal 12 and the negative electrode external terminal 14, and a seal is provided. A series of heating elements 23 are arranged in the portion 26. The heating element 22 and the heating element 23 are electrically connected to the power source 30 and the power source 33 arranged outside,
The resistor is a resistor that generates heat due to electric resistance, for example, a nichrome wire.

The packaging material film 40 has a laminate structure in which a metal foil layer is provided between the heat-welding resin layer and the protective film layer, as described later. When sealing the electrode body 10, the heat-welding resin layer is directed toward the electrode body 10 side,
The protective film layer is arranged so as to face outward.

[Method for Sealing Exterior Material Film] Next, a method for hermetically sealing the electrode body 10 between the pair of upper and lower exterior material films 40 will be described. First, the electrode body 10 is disposed between the pair of exterior material films 40, the ends of the pair of exterior material films 40 are aligned, and the heating elements 22, 23 of the pair of exterior material films 40 are arranged. In order to generate heat, the external power sources 30 and 33 are turned off.
N As a result, the adhesive portions of the heat-welding resin layers facing each other of the pair of exterior packaging material films 40 are heated. Next, as described above, the facing end edge portions of the packaging material film 40 are aligned and pressed by the pressure device to heat-bond the opposing heat-welding resin layers, and the edges of the packaging material film 40 are sealed. To be done. Here, when the heat-welding resin layer is adhered, pressure may be applied by a pressurizer after heat generation of the heating elements 22, 23 by the power supplies 30, 33, or the power supply 30,
Simultaneously with the heat generation of the heating elements 22 and 23 by 33, the pressure may be applied by a pressurizer to heat-weld. Further, the pressurizer may pressurize each side, or may be a pressurizer having a mold capable of pressurizing three sides at once.

After the heat welding of the end portions where the heating elements 22 and 23 are provided is completed, the position shown by the two-dot broken line in FIG.
That is, the heating element 2 is formed near the end of the exterior packaging film 40.
The connection between the power sources 2 and 23 and the power sources 30 and 33 is cut off. This makes it possible to manufacture a battery in which the electrode body 10 is hermetically sealed with the pair of exterior packaging material films 40 as shown in FIG.

In this embodiment, the heating elements 22 and 23 are left in the sealed portion of the exterior packaging film 40. For example, as described above, when the nichrome wires are used as the heating elements 22 and 23, the nichrome wires function as a reinforcing material for the entire sealing portion, so that damage due to physical impact can be prevented, and the above-described embodiment can be used. Compared with, the durability of the battery can be further improved.

Embodiment 3. A packaging material film for sealing the electrode body of another embodiment and a method for sealing the packaging material film will be described with reference to FIG. The same components as those in the first and second embodiments described above are designated by the same reference numerals and the description thereof is omitted.

[Packaging Material Film] In FIG. 6, the packaging material film is seen through from above, showing a state in which the electrode body 10 is arranged between adjacent bag-shaped packaging material films 50 having at least two sides sealed in advance. A perspective view of the case is shown. Figure 6
As shown in FIG. 3, a series of heating elements 25 are provided at both opposite ends of the unbonded side of the bag-shaped exterior material film 50, excluding the positive electrode external terminal 12, the negative electrode external terminal 14, and the seal portion 54 of the electrode body 10. It is wired. The heating element 25 is electrically connected to a power source 30 arranged outside, and is composed of a resistor, for example, a nichrome wire, which generates heat by electric resistance.

The exterior material film 50 has a laminated structure in which a metal foil layer is provided between the heat-welding resin layer and the protective film layer, as in the case of the exterior films 20 and 40 (FIGS. 1 and 3) described above. Have. And when sealing the electrode body 10,
The heat-welding resin layer is arranged toward the electrode body 10 side, and the protective film layer is arranged outward.

[Sealing Method for Exterior Material Film] Next, a method for hermetically sealing the electrode body 10 between the bag-shaped exterior material films 50 described above will be described. First, the electrode body 10 is arranged between the bag-shaped packaging material films 50, the other two end portions of the packaging material film 50 are aligned, and the heating element 25 of the packaging material film 50 is heated. Turn on the power source 30. Thereby, the exterior material film 5
The bonded portion of the heat-welding resin layer on one side of which 0 is opposed is heated. Next, as described above, the pressurizer is aligned with the opposed end edge portion of the exterior packaging material film 50 that is heated, and the portion is pressed to heat-bond the opposing heat-welding resin layers to form an exterior packaging material. The left end of the film 50 in FIG. 6 is sealed. Here, in the case of adhering the heat-welding resin layer, the heating element 25 may be heated by the power source 30 and then pressurized by the pressurizing device, or the heating element 25 may be heated by the power source 30 and simultaneously applied by the pressing device. It may be heat-welded.

After the heat welding of the end portion provided with the heating element 25 is completed, the positive electrode external terminal 12 and the negative electrode external terminal 14 are formed.
The sealing portion 54 is hermetically sealed so that both external terminals 12 and 14 can be led out by using a heating and pressing tool as in the conventional case. After that, the connection between the heating element 25 and the power source 30 is cut off at the position indicated by the two-dot chain line in FIG. 6, that is, in the vicinity of the end of the exterior packaging film 50. Thereby, the electrode body 10
It is possible to manufacture a battery in which the bag is hermetically sealed with the bag-shaped exterior material film 50.

In the present embodiment, the two adjacent sides of the packaging material film 50 are pre-heat-welded, so
The edges are firmly attached. Furthermore, since the heating element 25 functions as a reinforcing material on the sealed side where the heating element 25 remains, damage due to physical impact can be prevented.

[Manufacturing Method of Exterior Material Film] Next, the above-mentioned exterior material films 20, 40, 50 (FIGS. 1, 4, 6).
An example of the manufacturing method will be described with reference to FIGS. 7 and 8.

First, an example of the manufacturing method is shown in FIG. The series of patterned heating elements 22 described above are arranged at predetermined positions on one side of the metal foil layer 60 (FIG. 7A). Next, the heat-welding resin layer 62 is formed on the surface on which the heating element 22 is arranged, while the protective film layer 64 is formed on the other surface on which the heating element 22 is not arranged, and these layers are integrated. To manufacture the laminated exterior packaging film (FIG. 7).
(B)).

Another manufacturing method will be described with reference to FIG. The heat-welding resin layer 62 is formed by embedding a series of patterned heating elements 22 in predetermined places. On the other hand, the protective film layer 64 is provided on one surface of the metal foil layer 60.
Is formed. Then, the heat-welding resin layer 62 in which the heating element 22 is previously embedded and molded on the other surface of the metal foil layer 60.
Is placed and pressure is applied so that these layers are integrated to produce a laminate-structured exterior material film.

Here, as the heat-welding resin layer 62, for example, polyethylene (PE) or polypropylene (PP) having a low melting temperature is preferable. In addition, the protective film layer 64
May be any material as long as it has high weather resistance and is suitable for the purpose of preventing rust and corrosion of the battery. Metal foil layer 6
Examples of 0 include aluminum foil.

The current and voltage from the above-mentioned power source are
It is preferable to appropriately determine it according to the melting temperature of the resin selected for the heat-welding resin layer and the electric resistance value of the material used for the heating element. Further, although the structure in which the heating element is inserted in the exterior material film has been described with reference to FIGS. 7 and 8, the present invention is not limited to this, and the heating element may be arranged at a desired position on the heat-welding resin layer. .

The battery of this embodiment is, for example, a polymer electrolyte secondary battery which is hermetically sealed by the above-mentioned sealing method using the above-mentioned exterior material film.

[0055]

EXAMPLES Next, the present invention will be specifically described with reference to Examples and Comparative Examples.

(A) Battery production example: (i) A mixture of LiNiO ₂ and carbon powder was used as the positive electrode active material, and carbon powder was used as the negative electrode active material, and polyvinylidene fluoride (PVdF) was used as the binder for each. In addition, N is added as an organic solvent in order to uniformly disperse the above-mentioned components.
-Methyl-2-pyrrolidone (NMP) was added and mixed to obtain a mixed paste.

(Ii) The positive electrode mixed paste was applied on an aluminum foil, and the negative electrode mixed paste was applied on a copper foil. Then, they were dried at about 180 ° C. to remove NMP of the organic solvent, and the positive electrode and the negative electrode were removed. Got

(Iii) Next, a porous film made of polyethylene (PE) was sandwiched between the positive electrode and the negative electrode as a separator to obtain a wound electrode body.

(Iv) A positive electrode external terminal made of aluminum was connected to the positive electrode of the above electrode body, and a negative electrode external terminal made of copper was connected to the negative electrode of the electrode body by welding. On the other hand, in a separate container, using LiPF ₆ as an electrolyte as a supporting salt, 1 mol% of LiPF ₆ was added to a non-aqueous liquid having a volume ratio of ethylene carbonate (EC) / diethyl carbonate (DEC) of 5: 5 to prepare a non-aqueous electrolytic liquid. Prepared. Then, the prepared non-aqueous electrolyte was impregnated with an electrode body provided with an external terminal.

(V) Next, the electrode body is sandwiched between a pair of exterior material films whose central portion is recessed so that the electrode body can be accommodated,
Only in the example, a nichrome wire was arranged on the sealing surfaces of the pair of packaging materials films, and the opposite edge portions of the packaging material films were heat-welded with a width of 10 mm to obtain a hermetically sealed battery. In this example, as shown in FIG. 1, an outer packaging material film having a laminated structure in which nichrome wires were wired and PE was used as a heat-welding resin was used. On the other hand, in the comparative example, an exterior material film having the same structure as that of the example except that it does not have a heating element was used. Further, in this example, a pressurizing device of a stainless steel mold having a width of 10 mm was used, while in the conventional example, a heating type pressing tool was used. In addition, in this example, after sealing, the nichrome wire protruding from the exterior material film to the outside was cut.

(B) Evaluation method: The sealed portion of the exterior packaging material film was cut into a width of 10 mm, and the tensile strength as the breaking strength of the sealed portion was measured by an autograph. The results are shown in Fig. 9.

As shown in FIG. 9, the breaking load of the sealed portion of the example is about 50% of the breaking load of the sealed portion of the comparative example.
It has been found that the strength of the sealed portion is increased by using the packaging material film of the present invention and the sealing method of the present invention.

[0063]

Industrial Applicability As described above, according to the present invention, it is possible to provide an exterior material film capable of increasing the sealing strength as compared with the prior art and a sealing method therefor, thereby providing a battery having a high hermetic sealing property. Obtainable.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a structure of an exterior material film and a sealing method thereof according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a step of heat-welding opposing edge portions by the pressurizer according to the embodiment of the present invention, using a cross section taken along the line AA ′ of FIG.

FIG. 3 is a top perspective view of a battery obtained by sealing the electrode body shown in the first embodiment of the present invention with an exterior material film.

FIG. 4 is a diagram illustrating a structure of an exterior material film and a sealing method thereof according to a second embodiment of the present invention.

FIG. 5 is a top perspective view of a battery obtained by encapsulating the electrode body shown in the second embodiment of the present invention with an exterior material film.

FIG. 6 is a diagram illustrating a structure of an exterior material film and a sealing method thereof according to a third embodiment of the present invention.

FIG. 7 is a diagram illustrating an example of a method for manufacturing an exterior packaging film according to an embodiment of the present invention.

FIG. 8 is a diagram illustrating another example of a method for manufacturing an exterior packaging film according to the embodiment of the present invention.

FIG. 9 is a diagram illustrating the breaking strength of the packaging material films of Examples and Comparative Examples after heat-sealing.

FIG. 10 is a diagram illustrating a conventional method for sealing an exterior material film using a heating-type pressurizing tool.

FIG. 11 is a diagram illustrating a state of opposing edge portions of an exterior material film which is sandwiched between heating type pressure tools.

[Explanation of reference numerals] 10 electrode body, 12 positive electrode external terminal, 14 negative electrode external terminal, 20 exterior material film, 22 heating element, 24 sealing part, 30 power supply.

Continued front page    F-term (reference) 5H011 AA09 BB04 CC02 CC06 CC10                       DD13 DD26 EE04 FF02 FF04                       GG09 HH02 HH13 JJ25 JJ27                       JJ29                 5H022 AA09 BB03 BB12 BB19 BB28                       CC03 EE03 EE06 EE10                 5H029 AJ14 AK03 AL06 AM03 AM05                       AM07 BJ04 CJ02 CJ03 CJ05                       DJ02 DJ03 DJ05 EJ01 EJ12

Claims (9)

[Claims] 1. An electrode body comprising: a heat-welding resin layer; a heating element arranged to melt the heat-welding resin layer; and an external heat source for heating the heating element. Exterior material film to be sealed. 2. The laminate film according to claim 1, further comprising a protective film layer and a metal foil layer formed between the protective film layer and the heat-welding resin layer. An exterior material film for encapsulating an electrode body, which comprises: 3. The exterior material film according to claim 1, wherein the external heat source is an external power source, and the heating element generates heat by electric resistance. Exterior material film to be. 4. The packaging material film according to claim 1, wherein the heating element is disposed inside the heat-welding resin layer. Exterior material film to stop. 5. A step of arranging an electrode body having an external terminal between a pair of exterior material films having a heat-welding resin layer in which heating elements connected to an external heat source are disposed on at least three sides, and the external heat source. And a pressing step of pressing the opposing edge portions of the pair of outer packaging material films with a pressing device, while the external terminal is being led out. A method for sealing an outer packaging material film, comprising air-tightly sealing opposing edges of the pair of outer packaging material films by heat welding. 6. An external terminal is provided between a bag-shaped exterior material film having a heat-welding resin layer in which a heating element connected to an external heat source is arranged on at least one side and at least other adjacent two sides are pre-sealed. A step of disposing an electrode body having, a melting step of melting the heat-welding resin layer by causing the heating element to generate heat by the external heat source, and a pair of exterior material films at least the remaining two opposite edges by a presser And a pressing step of pressing, wherein the opposing edge portions of the pair of exterior material films are hermetically sealed by heat welding while the external terminals are led out. 7. The method of sealing an exterior material film according to claim 5 or 6, wherein the melting step and the pressing step are performed at the same time. 8. The method for sealing an exterior material film according to claim 5, wherein the external heat source is an external power source, and the heating element generates heat due to electric resistance. A characteristic method for sealing an exterior material film. 9. A battery manufactured by using the method for sealing an exterior material film according to claim 5.