JP2007018766A - Film-armored electric storage device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a film-armored electric storage device capable of preventing occurrence of displacement of a terminal for external connection arranged on fusing surfaces between armoring films constituting a film armoring body and occurrence of trouble due to the displacement; and to provide its manufacturing method. <P>SOLUTION: This film-armored electric storage device is provided with: an electrode body unit having a positive electrode and a negative electrode; the film armoring body 2 with a space for housing the electrode body unit formed in its inside; and at least one terminal 30 for external connection electrically connected to the electrode body unit and having one end exposed to the outside through the fusing surfaces 12 and 22 between the armoring films 10 and 20 constituting the film armoring body 2. The film-armored electric storage device is characterized in that insulating hard materials B are dispersed and present around the terminal 30 for external connection on the fusing surfaces 12 and 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a film exterior type power storage device and a method for manufacturing the same.

A so-called film-clad type power storage device having a structure in which an electrode body unit is housed and sealed inside a film-clad body formed by bonding film for sealing such as a laminate film by heat fusion or the like is used in various fields. Has been.
As a typical example of such a film exterior type power storage device, one end is an external connection terminal (for example, a thin plate-shaped terminal) on the positive electrode side and the negative electrode side connected to the electrode body unit inside the film exterior body. Examples of the other end include a power storage device including an external connection terminal drawn out through a fusion surface (sealing surface) between exterior films constituting the film exterior body.
In the power storage device of such a form, a device for ensuring the sealing between the external connection terminal and the film outer package (fused surface) has been conventionally performed. For example, Patent Documents 1 and 2 describe a battery including an external connection terminal in which a porous film for improving adhesiveness is formed on a surface in contact with a film outer package (sealing surface). Patent Document 3 discloses a battery in which the resistance to stress is improved by making the extending direction of resin arranged around the tab (another name for the terminal for external connection) different from the pulling-out direction of the tab. Is described.

JP 2001-84993 A JP 2002-25535 A JP 2004-31097 A

  By the way, when constructing such a film exterior type power storage device, the external connection terminals are correctly arranged at predetermined positions on the fusion surface (sealing surface) of the exterior films constituting the film exterior body. Is difficult and misalignment is likely to occur. However, if there is a misalignment of the external connection terminals, the external connection terminals and the exterior film (typically aluminum or the like between the outer surface layer made of a high-melting resin and the fusion layer made of a heat-fusible resin) The thickness of the fusion layer (that is, the distance between the terminal and the exterior film) for fusing the three-layer structure laminate film having a conductive barrier layer made of the above foil may be non-uniform, and thus the film It is not preferable because the sealing property of the outer package may be deteriorated, and further, a short circuit (for example, contact between the metal barrier layer of the three-layer structure laminate film and the terminal) may be caused at the portion where the fusion layer is lost. For this reason, although it is necessary to arrange | position a terminal carefully on an exterior film so that position shift may not occur, excessive care has also become a factor which reduces the manufacturing efficiency of the said electrical storage apparatus.

  Accordingly, the present invention has been created to solve the above-described problems relating to such a film-sheathed power storage device, and is provided with an external connection terminal (also referred to as a lead terminal) disposed on the fusion surface of the exterior films constituting the film exterior body. It is an object of the present invention to provide a method capable of efficiently producing a film-clad power storage device by preventing the occurrence of misregistration or preventing the occurrence of problems due to misregistration. Another object is to provide a film-clad power storage device obtained by such a manufacturing method.

A power storage device provided by the present invention includes an electrode body unit having a positive electrode and a negative electrode, a film exterior body in which a space for accommodating the electrode body unit is formed, and electrically connected to the electrode body unit; A film exterior power storage device comprising: at least one external connection terminal having one end exposed to the outside through a fusion surface between exterior films constituting the film exterior body. In the power storage device, an insulating hard material is dispersed around the external connection terminals on the fusion surface.
In this specification, “power storage device” refers to a device including one or more power storage elements (typically batteries or capacitors) that can extract predetermined electrical energy, and is not limited to a specific power storage mechanism. . A battery such as a lithium primary battery or other primary battery, a nickel-hydrogen secondary battery, a lithium secondary battery or other secondary battery, or a capacitor (physical battery) such as an electric double layer capacitor is included in the power storage device referred to herein. This is a typical example.
In the present specification, the “electrode unit” refers to a structure that includes at least one positive electrode and one negative electrode and serves as a main body of a battery or a capacitor (an electricity storage element).

  In the power storage device having such a configuration, the insulating hard material is dispersed around the external connection terminals, whereby direct contact between the terminals and the exterior film (typically forming a fusion surface). Contact between the metal terminal and the exterior film main body not through the fusion layer (the same applies hereinafter) can be prevented. Thereby, the short circuit (For example, the short circuit by the direct contact with the metal barrier layer and the external connection terminal in the said 3 layer structure laminated film) of a terminal and an exterior film can be prevented beforehand.

In a preferred embodiment of the power storage device disclosed herein, a resin layer that can be fused to the fusion surface of the exterior film is formed on at least a portion of the surface of the external connection terminal that faces the fusion surface. And the insulating hard material is dispersed in the resin layer.
According to this configuration, the presence of the resin layer can further strengthen the fusion between the external connection terminal and the exterior film adjacent to the terminal. Moreover, the contact with a terminal and an exterior film can be prevented with the insulating hard material contained in the state disperse | distributed to the resin layer. For this reason, according to the power storage device of this aspect, a high sealing property of the film outer package is realized, and the occurrence of a problem (short circuit or the like) associated with the positional deviation can be prevented.

In another preferable aspect of the power storage device disclosed herein, the insulating hard material is ceramic beads having an average particle diameter of 10 μm or more and 100 μm or less.
The hard material having such a configuration is suitable as a dispersion material that realizes the object of the present invention. According to the power storage device of this aspect, it is possible to achieve a high level of both high sealing performance of the film outer package and prevention of problems (such as short circuit) caused by the above-described positional deviation.

Further, the method for manufacturing a power storage device provided by the present invention includes an electrode body unit having a positive electrode and a negative electrode, a film exterior body that accommodates the electrode body unit therein, an electrical connection to the electrode body unit, and the This is a method of manufacturing a film-clad power storage device that includes at least one external connection terminal whose one end is exposed to the outside through a fusion surface between exterior films constituting a film exterior body.
The method includes the steps of preparing the electrode body unit and the external connection terminal, electrically connecting the external connection terminal to the electrode body unit, and being electrically connected to the external connection terminal. And a step of constructing a film exterior body in a state where the electrode body unit is accommodated therein. In the film exterior body construction step, a part of the external connection terminal is sandwiched between the fusion surfaces of two opposing exterior films constituting the film exterior body and facing each other. The terminal and the exterior film are arranged so that one end is exposed to the outside of the exterior body, and the insulating hard material is dispersed around the terminal sandwiched between the fusion surfaces of the two exterior films. It includes fusing two exterior films together.
According to the manufacturing method having such a configuration, the film exterior body is constructed by dispersing the insulating hard material around the terminals sandwiched between the fusion surfaces (that is, the surfaces that can be fused) of the two exterior films. In the process, direct contact between the external connection terminal and the exterior film due to misalignment can be prevented. Thereby, the short circuit (For example, the short circuit by the direct contact with the metal barrier layer of the said 3 layer structure laminated film and the terminal for external connection) can be prevented beforehand. For this reason, the film-clad power storage device can be efficiently manufactured without performing complicated operations such as correction of the positional displacement of the external connection terminals.

In one preferable aspect of the film exterior type power storage device manufacturing method disclosed herein, the external connection terminal can be fused to the surface of the portion sandwiched between the two exterior films. An external connection terminal provided with a resin layer which is a resin layer and in which the insulating hard material is dispersed is present.
When the external connection terminal having such a configuration is used, the presence of the resin layer makes it possible to more firmly and easily perform the fusion between the terminal and the exterior film adjacent to the terminal. Further, the insulating hard material contained in a state dispersed in the resin layer can easily prevent direct contact between the external connection terminal and the exterior film. For this reason, according to the method of the present aspect, high sealing performance is realized without causing excessive attention to the positional displacement of the external connection terminals, and the occurrence of problems (such as short circuits) associated with the positional displacement is prevented. The film exterior power storage device can be efficiently manufactured.

In another preferred embodiment of the film-wrapped power storage device manufacturing method disclosed herein, the hard material is ceramic beads having an average particle size of 10 μm to 100 μm.
The hard material having such a configuration is suitable as a dispersion material that realizes the object of the present invention, and according to the method for manufacturing a power storage device of this aspect, it is possible to prevent the occurrence of defects (short circuit etc.) due to high sealing performance of the film outer package and misalignment Thus, it is possible to efficiently manufacture the film exterior type power storage device while realizing the above.

  Hereinafter, preferred embodiments of the present invention will be described. It should be noted that matters other than matters specifically mentioned in the present specification (for example, the type and shape of the insulating hard material) and matters necessary for carrying out the present invention (for example, the configuration of the electrode body unit, the type of electrolyte, and the exterior) The film adhesion method and other film exterior body construction methods) can be grasped as design matters of those skilled in the art based on the prior art in this field. The present invention can be carried out based on the contents disclosed in this specification and the drawings and common general technical knowledge in the field.

As the film-clad power storage device provided by the present invention, at least one (typically one or two or more pairs of positive and negative terminals) external connection terminals (externally drawn out from the film-clad body) Lead terminals) and two exterior films constituting the film exterior body (which need not be physically two separate exterior films, but two exterior film portions facing each other across the fusion surface). There are no particular restrictions on the type of power storage device, the properties of the electrode body unit, etc., as long as it has a suitable insulating hard material in between.
Typical examples to which the present invention is applied include various film-clad batteries (primary batteries and secondary batteries). The number of electrode body units accommodated in the power storage device is not limited to one, and two or more electrode body units may be accommodated in a single film outer package (typically, an assembled battery).
The electrode body unit mounted on the film-clad battery or other power storage device disclosed herein may be a power storage element component (or a power generation element component) that can store and release predetermined power. There is no particular limitation. Typical power storage elements include various types of primary batteries (eg, lithium primary batteries, manganese batteries), secondary batteries (eg, lithium secondary batteries, nickel metal hydride batteries), or capacitors (eg, electric double layer capacitors). be able to. For example, an electrode body unit formed by winding a sheet-shaped positive electrode and negative electrode together with a separator or an electrode body unit formed by laminating a plurality of sheet-shaped positive electrodes, negative electrodes, and separators, as used in lithium secondary batteries, It is a preferable typical example of the electrode body unit which comprises the film exterior type electrical storage apparatus (film exterior type battery) disclosed here. There is no restriction | limiting in particular in the shape and size of the electrode body unit of a film exterior type electrical storage apparatus, A desired form and size can be taken.
Further, the external connection terminal for connecting to an external electric circuit can take various forms. For example, a thin plate-shaped aluminum external connection positive electrode terminal and a copper external connection negative electrode terminal are connected to an aluminum positive electrode and a copper negative electrode constituting the electrode body unit, respectively.

  As the exterior film constituting the film exterior body itself of the film exterior type power storage device of the present invention (that is, the sealing film constituting the film exterior body), this kind of film exterior type electrical storage device (for example, secondary battery) is used. If it comprises an exterior body, it can use without limitation. For example, the laminate film conventionally used widely as what comprises film exterior bodies, such as a lithium secondary battery, is mentioned. Preferably, it is composed of an outer surface (protective) layer composed of a high melting point resin (for example, polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polyamide (PA) resin) and a metal foil (for example, aluminum, steel). A fusion layer composed of a barrier layer (a barrier layer that blocks gas and moisture) and a heat-fusible resin (a resin having a relatively low melting point, such as an ethylene-vinyl acetate, or an olefin resin such as polyethylene or polypropylene). A laminate film having a three-layer structure with a layer can be suitably used. Such a three-layer laminated film can be easily fused (adhered) to each other by using an appropriate thermocompression bonding means (for example, a heat press machine).

Next, the insulating hard material according to the present invention will be described. As an insulating hard material, a direct contact between an external connection terminal and an exterior film (typically, a three-layer structure laminate film) while maintaining a dispersed state on a fusion surface between two exterior films (for example, a three-layer laminated film) Various shapes and materials that can prevent contact between the metal barrier layer of the three-layer laminated film and the terminal can be used.
From the viewpoint of being easily dispersed, those having a fine bead shape (especially spherical beads) are preferable, and from the viewpoint that they are not easily affected by heat-sealing of the exterior films (for example, a melting point of 300 ° C.). Above) or ceramic. For example, an insulating hard material made of a ceramic such as alumina, zirconia, heat resistant silica, silicon nitride, silicon carbide, sialon, or a heat resistant polymer such as polytetrafluoroethylene, polyimide, or aramid is particularly preferable. When using a bead-like hard material made of these materials, the particle size may vary depending on the size and shape of the power storage device and / or the external connection terminal. For example, if the thickness of the terminal is about 1 to 3 mm, insulation The average particle size of the conductive hard material is preferably about 10 to 100 μm, particularly preferably about 20 to 50 μm. When the average particle diameter is too larger than 100 μm, irregularities due to the hard material are generated on the fused surface of the exterior film, so that the appearance is deteriorated. On the other hand, if the average particle size is too small, the desired effect cannot be obtained.

There can be various means for disposing such a hard material on a fusion surface (specifically, a surface before actual fusion) between exterior films that can be fused to each other. For example, a liquid agent containing the hard material in a dispersed state can be applied (for example, sprayed or applied) to the fusion surface of the exterior film.
Preferably, a resin layer (also referred to as a tab resin) that can be fused to the fusion surface and a suitable insulating hard material is dispersed on the surface of the external connection terminal facing the exterior film fusion surface. A resin layer is formed in the finished state. Such a resin layer can be easily formed on the surface of the metal terminal by a general injection molding method or extrusion molding method. Alternatively, it can be easily formed by simply pouring molten resin into the surface (preferably a recess) of the terminal.
By using such an external connection terminal with a resin layer, when the fusion surface of the exterior film and the resin layer (tab resin) of the external connection terminal are fused (typically thermal fusion), It is possible to dispose the insulating hard material in a state of being suitably dispersed in the fusion resin layer (that is, around the terminal) (see the examples described later).
In addition, although the kind of resin (tab resin) which comprises a resin layer may change suitably according to the kind of constituent resin by the side of the corresponding exterior film (fusion surface), Similar resins are preferred. For example, when the fusion surface of the exterior film is made of an olefin resin such as polypropylene, the resin layer (tab resin) of the external connection terminal is preferably made of the same olefin resin such as polypropylene.

Thus, as a result of the hard material being dispersed and arranged around the external connection terminals at the time of fusion, even if the external connection terminals are arranged slightly deviated from a predetermined position, the hard material is interposed. Thus, direct contact between the exterior film (typically, the three-layer structure laminate film) and the external connection terminal can be prevented, and occurrence of problems such as short circuit can be prevented.
The content of the hard material (for example, heat-resistant resin or ceramic beads) contained in the resin layer (tab resin) of the external connection terminal is not particularly limited, but it is possible to prevent the occurrence of problems associated with the positional displacement of the external connection terminal. From the viewpoint of ensuring high sealing performance at the periphery of the film exterior body, it is preferable that about 1 to 50 vol% of the entire resin layer (volume ratio) is a hard material, and particularly preferably about 5 to 30 vol%. .

  The power storage device disclosed herein can be manufactured by a conventionally known manufacturing method other than using the above-described insulating hard material (dispersing material). That is, an electrode body unit and an external connection terminal having desired properties are prepared, the external connection terminal and the electrode body unit are electrically connected, and the obtained electrode body unit with an external connection terminal is accommodated inside. The film outer package in the state of being made is constructed. At this time, the external connection terminals in a state where a suitable insulating hard material is dispersed are sandwiched between the two facing outer films, and the two facing films are fused to each other. Thereby, the film exterior type electrical storage device according to the present invention can be obtained in which the occurrence of the trouble due to the positional deviation is prevented.

  Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 3, but the present invention is not intended to be limited to that shown in the drawings.

The present embodiment shows a film-covered lithium secondary battery as a typical example of the film-covered power storage device 1. FIG. 1 is a perspective view schematically showing an outline of a film-clad power storage device 1 according to this embodiment. FIG. 2 is a perspective view of the state in which the film outer package 2 is removed.
As shown in FIGS. 1 and 2, the film-clad power storage device 1 according to the present embodiment is broadly divided into a flat film-clad body 2 and a flat shape housed in the film-clad body 2. The electrode body unit 4 includes a positive electrode lead terminal 30 and a negative electrode lead terminal 40 which are a pair of thin plate external connection terminals electrically connected to the electrode body unit 4.

The film exterior body 2 is comprised by the two exterior films 10 and 20 piled up similarly to this kind of general film exterior type flat battery. The exterior films 10 and 20 according to the present embodiment are conventional general three-layer structure laminate films. That is, the exterior films 10 and 20 are composed of an outer surface layer (protective layer) made of polyethylene terephthalate resin, thin fusion layers 12 and 22 made of polypropylene resin (melting point 100 to 200 ° C.), and the outer surface phase and the melt. It has a three-layer structure including a barrier layer made of an aluminum foil existing between the adhesion layers 12 and 22.
A recess 3 is formed at the center of the exterior films 10 and 20 when viewed from the side of the fusion layers 12 and 22. The electrode body unit accommodation space is formed inside the film exterior body 2 by overlapping the two exterior films 10 and 20 (on the side of the fusion layers 12 and 22) with the recess 3 facing each other. Then, the peripheral portions 10A and 20A of the two exterior films 10 and 20 overlapped are heat-sealed using a general heating means (for example, a heat press machine), and the peripheral portions 10A and 20A are sealed. Thus, the film exterior body 2 in a state where the electrode body unit 4 as shown in FIG. 1 is housed therein is constructed.

  As shown in FIG. 2, the electrode body unit 4 according to this example includes an aluminum positive electrode sheet (positive electrode) 6 and a copper negative electrode sheet (negative electrode) 8 laminated together with a separator, and further the positive electrode sheet 6 and the negative electrode sheet 8. This is a general wound electrode body unit 4 that is manufactured by winding while slightly shifting. As a result of the winding type electrode body unit 4 being wound while being slightly shifted in the lateral direction with respect to the winding direction, a part of the ends of the positive electrode sheet 6 and the negative electrode sheet 8 are respectively wound core portions 7. That is, it protrudes outward from the main part constituting the element in which the positive electrode sheet 6, the negative electrode sheet 8, and the separator are wound closely. The protruding portions 36 and 46 are electrically connected (can be energized) by various bonding means (in this case, ultrasonic bonding) such that the positive electrode lead terminal 30 and the negative electrode lead terminal 40 extend in different directions. . The positive electrode lead terminal 30 is made of aluminum and is formed into a thin plate shape having a thickness of about 1 mm. On the other hand, the negative electrode lead terminal 30 is made of copper and, like the positive electrode, is formed into a thin plate shape having a thickness of about 1 mm.

  As shown in FIG. 2, the film peripheral portion 10 </ b> A when a part of the surface of the positive and negative electrode lead terminals 30, 40 is accommodated in the electrode body unit housing space of the film exterior body 2. Resin layers (tab resins) 32 and 42 are formed in advance by a general injection molding method on the portion disposed at 20A. The resin layers 32 and 42 according to the present embodiment are mainly composed of a polypropylene resin, similarly to the fusion layers 12 and 22 of the exterior films 10 and 20. In the resin, alumina beads B having an average particle diameter of about 20 μm are mixed and dispersed. In this embodiment, the content of the alumina beads B is approximately 20 vol% of the entire resin layers (tab resins) 32 and 42.

Thus, as shown in FIG. 3, which is a cross-sectional view (schematic diagram) taken along line III-III in FIG. 1, when the film exterior body 2 is constructed, the resin layers 32, 42 of these positive and negative electrode lead terminals 30, 40. Is sandwiched between the peripheral portions 10A and 20A (that is, between the exterior film fusion surfaces 12 and 22) of the two exterior films 10 and 20 facing each other. The portions 10A and 20A are heat-sealed using a general heating means (for example, a heat press machine). Thereby, the polypropylene resin constituting the resin layers 32 and 42 of the positive and negative electrode lead terminals 30 and 40 and the polypropylene resin constituting the fusion surfaces 12 and 22 of the exterior films 10 and 20 are melted and fused. As a result, Sealing of the periphery of the film outer package 2 is performed.
At this time, since the above-described acrylic beads B are dispersed in the resin layers 32 and 42 of the positive and negative electrode lead terminals 30 and 40, the positive and negative electrode lead terminals 30 and 40 are misaligned during heat fusion. Even in such a case, the metal barrier does not involve a direct contact between the positive and negative electrode lead terminals 30 and 40 and the exterior films 10 and 20 due to the interposition of the beads B, specifically, a fusion layer that is melted by heating. Contact with a layer (that is, a conductive layer capable of causing a short circuit) can be prevented.

In this embodiment, the peripheral portions 10A and 20A other than the portion are first heat-sealed while securing an electrolyte injection path (not shown) in a part of the film outer package 2. And predetermined electrolyte for lithium secondary batteries is inject | poured in the electrode body unit accommodation space from the opening part (namely, injection port) of the said electrolyte injection path. After the injection of the electrolyte, the electrolyte injection path is closed by heat fusion or the like. Thereby, the film exterior type electrical storage device 1 is manufactured. It should be noted that the formation of the electrolyte injection path and the electrolyte injection process may be the same as those performed in the production of a conventional film-covered lithium secondary battery, and do not characterize the present invention. The electrolyte injected here can be used without particular limitation as long as it is conventionally used as an electrolyte for lithium secondary batteries, and does not characterize the present invention. Typically, a polymer electrolyte that is liquid (eg, non-aqueous electrolyte) or gel is used. For example, a nonaqueous electrolytic solution in which 1 mol / L LiPF ₆ is dissolved as a lithium salt in a mixed solvent of diethyl carbonate (DEC) and ethylene carbonate (EC) (for example, a mixed solvent in which DEC: EC is a mass ratio of 7: 3). Can be preferably used.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
For example, in each of the above embodiments, a lithium secondary battery has been described. However, the present invention can be applied to various film-clad power storage devices, such as other types of secondary batteries such as nickel-hydrogen batteries and nickel-cadmium batteries, and electric double layer capacitors. The present invention can also be applied to various power storage elements. The material such as the active material, current collector and terminal, and separator constituting the electrode unit, the composition of the electrolyte, and the like can be appropriately determined according to the type of the storage element.
The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing.

It is the perspective view which showed typically the film exterior type electrical storage apparatus (lithium secondary battery) which concerns on one Example of this invention. It is the perspective view which showed typically the state except the film exterior body of the electrical storage apparatus shown in FIG. It is the III-III sectional view taken on the line in FIG.

Explanation of symbols

1 Film exterior power storage device (lithium secondary battery)
2 Film exterior 4 Electrode body unit 10, 20 Exterior film (laminate film)
30, 40 Lead terminals 32, 42 Resin layer (tab resin)
B Alumina beads (insulating hard material)

Claims (6)

An electrode body unit having a positive electrode and a negative electrode, a film exterior body in which a space for accommodating the electrode body unit is formed, and exterior films that are electrically connected to the electrode body unit and constitute the film exterior body And at least one external connection terminal whose one end is exposed to the outside through the fusion surface of the film,
The film-covered power storage device, wherein an insulating hard material is dispersed around the external connection terminal on the fusion surface.   A resin layer that can be fused to the fused surface of the exterior film is formed on at least a portion of the surface of the external connection terminal facing the fused surface, and the insulating hard material is formed in the resin layer. The power storage device according to claim 1, wherein the power storage device exists in a dispersed manner.   The power storage device according to claim 1, wherein the hard material is ceramic beads having an average particle diameter of 10 μm to 100 μm. An electrode body unit having a positive electrode and a negative electrode; a film exterior body containing the electrode body unit therein; and a fusion surface between exterior films electrically connected to the electrode body unit and constituting the film exterior body A method of manufacturing a film-clad power storage device including at least one external connection terminal that is partially exposed to the outside and includes the following steps:
Preparing the electrode body unit and external connection terminals;
Electrically connecting the external connection terminal with the electrode body unit; and constructing a film outer package in which the electrode body unit electrically connected with the external connection terminal is housed, Thus, a part of the external connection terminal is sandwiched between the fusion surfaces of two mutually-facing exterior films constituting the film exterior body, and one end of the terminal is exposed to the outside of the exterior body. The terminals and the exterior film are arranged as described above, and the two exterior films are fused to each other with the insulating hard material dispersed around the terminals sandwiched between the fusion surfaces of the two exterior films. Do;
Including the method.   As the external connection terminal, a resin layer that can be fused to the fusion surface of the exterior film on the surface of the portion sandwiched between the two exterior films, and in which the insulating hard material is dispersed and present The power storage device manufacturing method according to claim 4, wherein an external connection terminal including:   The power storage device manufacturing method according to claim 4 or 5, wherein the hard material is ceramic beads having an average particle size of 10 µm to 100 µm.

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