Laminate film, manufacturing method of laminate film, battery, and manufacturing method of battery

Abstract

To provide a laminate film capable of improving the reliability of batteries.SOLUTION: A laminate film 1 includes: a first resin film 11; a second resin film 12 facing the first resin film 11; A first metal layer 21 that is disposed between the first resin film 11 and the second resin film 12; and a second metal layer 22 that is disposed between the first resin film 11 and the second resin film 12. The first metal layer 21 and the second metal layer 22 are electrically insulated. The laminate film 1 has, in plan view: a first area 41 where the first metal layer 21 is present, but the second metal layer 22 is absent, and a second area 42 where the first metal layer 21 does not exist, but the second metal layer 22 exists.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a laminate film for a battery exterior body, a method for manufacturing the same, a battery using the laminate film as the battery exterior body, and a method for manufacturing the same.

Background Art

[0002] Patent Document 1 discloses a structure in which two laminate films are stacked in a battery. Further, the laminate film disclosed in Patent Document 1 includes a welding resin layer, a metal layer, and a heat-resistant resin layer provided between the welding resin layer and the metal layer and having a melting point higher than that of the welding resin layer.

[0003] Patent Document 2 discloses a lithium-ion battery module having two metal sheets and a power storage element between the two metal sheets, with the two metal sheets insulated from each other.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the prior art, it is desired to improve the reliability of a battery in which a power generation element is sealed with a laminate film.

[0006] Therefore, the present disclosure provides a laminate film and a method for manufacturing the laminate film that can improve the reliability of a battery, as well as a highly reliable battery and a method for manufacturing the battery.

Means for Solving the Problems

[0007] A laminate film according to one aspect of the present disclosure includes a first resin film, a second resin film facing the first resin film, a first metal layer positioned between the first resin film and the second resin film, and a second metal layer positioned between the first resin film and the second resin film. The first metal layer and the second metal layer are electrically insulated from each other. In plan view, the laminate film has a first region where the first metal layer is present and the second metal layer is not present, and a second region where the first metal layer is not present and the second metal layer is present.

[0008] A method for manufacturing a laminate film according to one aspect of the present disclosure includes laminating a first resin film, a first metal layer, a second metal layer, and a second resin film such that the second resin film faces the first resin film, the first metal layer and the second metal layer are positioned between the first resin film and the second resin film, and the first metal layer and the second metal layer are electrically insulated from each other, and integrating the first resin film, the first metal layer, the second metal layer, and the second resin film. In the laminating step, the first resin film, the first metal layer, the second metal layer, and the second resin film are laminated such that in plan view, a first region where the first metal layer is present and the second metal layer is not present, and a second region where the first metal layer is not present and the second metal layer is present are formed in the laminate film.

[0009] A battery according to one aspect of the present disclosure includes a power generation element having an electrode layer and a counter electrode layer, one or more laminate films including the laminate film as a first laminate film, an electrode terminal electrically connected to the electrode layer, and a counter electrode terminal electrically connected to the counter electrode layer. The one or more laminate films include a first film portion and a second film portion facing each other so as to sandwich the power generation element, the electrode terminal, and the counter electrode terminal. The power generation element is sealed so that a part of the electrode terminal and a part of the counter electrode terminal are exposed. The first film portion is constituted by at least a part of the first laminate film and is adhered to the electrode terminal in the first region.

[0010] A method for manufacturing a battery according to one aspect of the present disclosure includes preparing one or more laminate films including the laminate film as a first laminate film, preparing a power generation element having an electrode layer and a counter electrode layer, preparing an electrode terminal electrically connected to the electrode layer and a counter electrode terminal electrically connected to the counter electrode layer, sandwiching the power generation element, the electrode terminal, and the counter electrode terminal between a first film portion and a second film portion which are opposing portions in the one or more laminate films, and sealing the power generation element so that a part of the electrode terminal and a part of the counter electrode terminal are exposed by the one or more laminate films. The first film portion is constituted by at least a part of the first laminate film, and by sealing the power generation element, the first film portion is adhered to the electrode terminal in the first region.

Effects of the Invention

[0011] According to the present disclosure, the reliability of the battery can be improved.

Brief Description of the Drawings

[0012]

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BEST MODE FOR CARRYING OUT THE INVENTION

[0013] (Process of arriving at one aspect of the present disclosure) By sandwiching a power generation element in a battery with a laminate film used as a battery exterior body, the power generation element can be sealed. Thereby, it is possible to suppress the power generation element sealed with the laminate film from being exposed to the outside air, moisture, and the like.

[0014] The laminate film used as a battery exterior body has a structure in which a metal layer is sandwiched between resin films in order to enhance gas barrier properties and suppress the permeation of air and moisture. The inventors of the present application have found that the following problems occur when such a laminate film is used as a battery exterior body.

[0015] As described above, since the laminate film for a battery exterior body has a metal layer sandwiched between resin films, a short circuit between the positive and negative electrodes of the battery may occur through the metal layer of the laminate film. In particular, when performing a heat sealing process on the laminate film near the terminal connected to the power generation element of the battery, if the terminals of the positive and negative electrodes come into contact with the metal layer, a short circuit between the positive and negative electrodes will occur. In order to suppress such a short circuit, measures such as protecting the terminal by disposing a resin-made melt sleeve between the terminal and the laminate film may be taken. However, when protecting the terminal with a melt sleeve, even if a short circuit between the positive and negative electrodes can be suppressed, the resin thickness becomes large in the vicinity of the terminal protected by the melt sleeve, and the amount of intrusion of moisture and the like tends to increase.

[0016] Based on such circumstances, the inventors of the present application focused on the fact that suppressing a short circuit between the positive and negative electrodes of the battery through the laminate film in an appropriate manner is effective for enhancing the reliability of the battery.

[0017] The present disclosure is made based on the above findings of the inventors of the present application, and provides a laminate film and a method for manufacturing the laminate film that can improve the reliability of the battery, as well as a highly reliable battery and a method for manufacturing the battery.

[0018] (Summary of the Present Disclosure) As an overview of the present disclosure, examples of the laminate film, the method for manufacturing the laminate film, the battery, and the method for manufacturing the battery according to the present disclosure are shown below.

[0019] For example, the laminate film according to the first aspect of the present disclosure includes a first resin film, a second resin film facing the first resin film, a first metal layer positioned between the first resin film and the second resin film, and a second metal layer positioned between the first resin film and the second resin film. The first metal layer and the second metal layer are electrically insulated from each other. In a plan view, the laminate film has a first region where the first metal layer is present and the second metal layer is not present, and a second region where the first metal layer is not present and the second metal layer is present.

[0020] Accordingly, the power generation element of a battery can be sealed with high reliability using the laminate film according to this aspect. Specifically, since the laminate film according to this aspect includes a first metal layer and a second metal layer that are electrically insulated from each other, when sealing the power generation element of a battery, even if a terminal electrically connected to the power generation element contacts the first metal layer or the second metal layer, a short circuit between the positive and negative electrodes via the first metal layer and the second metal layer is suppressed. Therefore, in a battery using the laminate film according to this aspect as an outer package of the battery, since the power generation element of the battery can be sealed and protected and a short circuit between the positive and negative electrodes can be suppressed, the reliability of the battery can be improved.

[0021] Further, the above short circuit can be suppressed without arranging a structure such as a molten sleeve that suppresses contact between the terminal and the laminate film, such as a resin layer, between the terminal and the laminate film. Therefore, it is possible to realize a battery configuration in which moisture intrusion through the structure does not occur while suppressing the short circuit.

[0022] Further, for example, the laminate film according to the second aspect of the present disclosure is the laminate film according to the first aspect, and the thickness of the laminate film in the first region and the thickness of the laminate film in the second region may be the same.

[0023] Thereby, the handling of the laminate film can be facilitated.

[0024] Further, for example, the laminate film according to the third aspect of the present disclosure is the laminate film according to the first aspect or the second aspect, and further includes an insulating layer that is located between the first metal layer and the second metal layer and electrically insulates the first metal layer and the second metal layer. The laminate film may have a third region where the first metal layer and the second metal layer are present in a plan view.

[0025] Thereby, the gas barrier property of the laminate film can be enhanced by the third region in which the first metal layer and the second metal layer are present, with electrical insulation ensured by the insulating layer.

[0026] Further, for example, the laminate film according to the fourth aspect of the present disclosure is the laminate film according to the third aspect, and the thickness of the laminate film in the first region may be the same as the thickness of the laminate film in the third region.

[0027] Thereby, the flatness of the battery using the laminate film according to this aspect as the battery exterior can be improved.

[0028] Further, for example, the laminate film according to the fifth aspect of the present disclosure is the laminate film according to the third aspect or the fourth aspect, and the heat resistance temperature of the insulating layer may be higher than the heat resistance temperature of the first resin film.

[0029] Thereby, the heat resistance of the battery using the laminate film according to this aspect as the battery exterior can be enhanced. Also, even when the laminate film is exposed to a high temperature, electrical insulation between the first metal layer and the second metal layer can be ensured.

[0030] Further, for example, the laminate film according to the sixth aspect of the present disclosure is the laminate film according to any one of the third aspect to the fifth aspect, and the breaking strength of the insulating layer may be higher than the breaking strength of the first resin film.

[0031] As a result, when an external force such as a puncture wound is applied to a battery using the laminate film as a battery exterior body, the battery is more easily protected.

[0032] Also, for example, the laminate film according to the seventh aspect of the present disclosure is a laminate film according to any one of the third aspect to the sixth aspect, and may further include a bonding layer that bonds the insulating layer and the first metal layer.

[0033] Thereby, the range of material selection for the insulating layer can be widened, and the degree of freedom in the manufacturing process of the laminate film can be increased.

[0034] Also, for example, the laminate film according to the eighth aspect of the present disclosure is a laminate film according to any one of the third aspect to the seventh aspect, and in a plan view, the area of the third region may be 50% or more of the area of the laminate film.

[0035] Thereby, the gas barrier property of the laminate film can be enhanced.

[0036] Also, for example, the laminate film according to the ninth aspect of the present disclosure is a laminate film according to any one of the third aspect to the eighth aspect, and in a plan view, the area of the third region may be 50% or more of the area of the laminate film.

[0037] Thereby, the gas barrier property of the laminate film can be enhanced.

[0038] Also, for example, the laminate film according to the tenth aspect of the present disclosure is a laminate film according to the first aspect or the second aspect, and includes an insulating portion that is located between the first metal layer and the second metal layer and electrically insulates the first metal layer and the second metal layer, and in a plan view, the first metal layer and the second metal layer may be separated without overlapping.

[0039] This makes it possible to ensure electrical insulation between the first metal layer and the second metal layer even when they are arranged in the same plane, and to increase the degree of freedom in arranging the first metal layer and the second metal layer.

[0040] Further, for example, the laminate film according to the 11th aspect of the present disclosure is the laminate film according to the 10th aspect, and in plan view, covers the insulating portion through the first resin film or the second resin film, and further includes an auxiliary layer overlapping at least a part of the first metal layer and at least a part of the second metal layer.

[0041] This can reduce the permeation of moisture and the like through the insulating portion.

[0042] Further, for example, the laminate film according to the 12th aspect of the present disclosure is the laminate film according to the 1st aspect or the 2nd aspect, and includes a third metal layer located between the first resin film and the second resin film, and is located between the first metal layer and the third metal layer, and between the second metal layer and the third metal layer, and further includes one or more insulating layers that electrically insulate the first metal layer and the third metal layer and electrically insulate the second metal layer and the third metal layer. In plan view, the laminate film has a third region where the third metal layer exists and the first metal layer and the second metal layer do not exist, a fourth region where the first metal layer and the third metal layer exist and the second metal layer does not exist, and a fifth region where the second metal layer and the third metal layer exist and the first metal layer does not exist. In the first region and the second region, the third metal layer may not exist.

[0043] This can enhance the gas barrier property of the laminate film by the third metal layer that partially overlaps the first metal layer and the second metal layer in plan view. In addition, since the third metal layer that does not exist in either the first region or the second region is provided, the range of choices such as the specifications and manufacturing methods of the first metal layer, the second metal layer, and the third metal layer can be widened.

[0044] Further, for example, the method for manufacturing a laminate film according to the 13th aspect of the present disclosure is to laminate a first resin film, a first metal layer, a second metal layer, and a second resin film, wherein the second resin film faces the first resin film, the first metal layer and the second metal layer are located between the first resin film and the second resin film, and the first metal layer and the second metal layer are laminated so as to be electrically insulated from each other; and integrating the first resin film, the first metal layer, the second metal layer, and the second resin film. In the lamination, in a plan view, the first resin film, the first metal layer, the second metal layer, and the second resin film are laminated such that a first region where the first metal layer exists and the second metal layer does not exist, and a second region where the first metal layer does not exist and the second metal layer exists are formed in the laminate film.

[0045] Further, for example, the method for manufacturing a laminate film according to the 14th aspect of the present disclosure is the method for manufacturing a laminate film according to the 13th aspect. In the lamination, in a plan view, an insulating layer that electrically insulates the first metal layer and the second metal layer is laminated between the first resin film, the first metal layer, the second metal layer, the second resin film, and between the first metal layer and the second metal layer such that the first region, the second region, and a third region where the first metal layer and the second metal layer exist are formed. In the integration, the first resin film, the first metal layer, the insulating layer, the second metal layer, and the second resin film may be integrated.

[0046] Further, for example, the method for manufacturing a laminate film according to the 15th aspect of the present disclosure is the method for manufacturing a laminate film according to the 13th aspect, and may further include forming an insulating portion that is located between the first metal layer and the second metal layer and electrically insulates the first metal layer and the second metal layer, and arranging the first metal layer and the second metal layer so as to be separated from each other without overlapping in a plan view.

[0047] These can be used to produce a laminate film capable of improving the reliability of the battery described above.

[0048] Also, for example, the battery according to the 16th aspect of the present disclosure includes a power generation element having an electrode layer and a counter electrode layer, one or more laminate films including the laminate film according to any one of the 1st to 12th aspects as the first laminate film, an electrode terminal electrically connected to the electrode layer, and a counter electrode terminal electrically connected to the counter electrode layer. The one or more laminate films include a first film portion and a second film portion facing each other so as to sandwich the power generation element, the electrode terminal, and the counter electrode terminal. The power generation element is sealed so that a part of the electrode terminal and a part of the counter electrode terminal are exposed. The first film portion is composed of at least a part of the first laminate film and is adhered to the electrode terminal in the first region.

[0049] Thus, even when the first metal layer of the first laminate film and the electrode terminal come into contact with each other in the first region due to the sealing of the power generation element by one or more laminate films, since the first metal layer and the second metal layer are not electrically connected, a short circuit between the electrode layer and the counter electrode layer via the first laminate film can be suppressed. Therefore, a highly reliable battery can be realized.

[0050] Also, for example, the battery according to the 17th aspect of the present disclosure is the battery according to the 16th aspect, wherein the electrode terminal is an electrode lead drawn out to the outside of the power generation element in a plan view, the counter electrode terminal is a counter electrode lead drawn out to the outside of the power generation element in a plan view, and the electrode lead and the counter electrode lead may each be sandwiched between the first film portion and the second film portion and adhered to respective ends of the first film portion and the second film portion.

[0051] Thus, in a battery including leads connected to an electrode layer and a counter electrode layer, the power generation element can be sealed with high reliability.

[0052] Further, for example, the battery according to the 18th aspect of the present disclosure is the battery according to the 16th aspect, wherein the electrode terminal is an electrode pad disposed on the main surface of the power generation element, the counter electrode terminal is a counter electrode pad disposed on the main surface of the power generation element, an opening for exposing a part of the electrode pad is formed in the first region in the first film portion, and the first film portion may be adhered to the electrode pad around the opening in the first region.

[0053] Thereby, in a battery in which pads are disposed on the main surface of the power generation element, the power generation element can be sealed with high reliability.

[0054] Further, for example, the battery according to the 19th aspect of the present disclosure is the battery according to any one of the 16th to 18th aspects, wherein the electrode layer is electrically connected to the first metal layer.

[0055] Thereby, the heat of the electrode layer and the electrode terminal connected to the electrode layer can be released to the first metal layer, and the reliability of the battery can be improved.

[0056] Further, for example, the method for manufacturing a battery according to the 20th aspect of the present disclosure includes preparing one or more laminate films including the laminate film according to any one of the 1st to 12th aspects as the first laminate film, preparing a power generation element having an electrode layer and a counter electrode layer, preparing an electrode terminal electrically connected to the electrode layer and a counter electrode terminal electrically connected to the counter electrode layer, sandwiching the power generation element, the electrode terminal, and the counter electrode terminal between a first film portion and a second film portion which are opposing portions in the one or more laminate films, and sealing the power generation element so that a part of the electrode terminal and a part of the counter electrode terminal are exposed by the one or more laminate films. The first film portion is composed of at least a part of the first laminate film, and by sealing the power generation element, the first film portion is adhered to the electrode terminal in the first region.

[0057] As a result, the highly reliable battery described above can be manufactured.

[0058] In addition, in the prior art, it is desired to improve the heat dissipation of a battery in which a power generation element is sealed with a laminate film.

[0059] In particular, in applications where the battery is charged and discharged at high speed, the current during charging and discharging is large, and accordingly, the heat generation from the power generation element and the terminals connected to the positive and negative electrodes of the power generation element increases. If the heat generated during charging and discharging is unevenly distributed and the temperature of a specific part of the battery continues to rise, there is a risk that the reliability of the battery will decrease. Therefore, in order to suppress the deterioration of the performance and reliability of the battery due to heat generation during charging and discharging, it is desired to improve the heat dissipation of the battery.

[0060] Examples of the battery and the method for manufacturing the battery according to the present disclosure for providing a battery with high heat dissipation and a method for manufacturing the battery are shown below.

[0061] For example, a battery according to the 21st aspect of the present disclosure includes one or more laminate films including a first resin film, a second resin film facing the first resin film, a first metal layer positioned between the first resin film and the second resin film, and a second metal layer positioned between the first resin film and the second resin film, and a power generation element having an electrode layer and a counter electrode layer, the power generation element being sandwiched and sealed between the one or more laminate films, and the electrode layer being electrically connected to the first metal layer or the second metal layer.

[0062] As a result, the heat dissipation of the battery according to this aspect can be improved, and it can be suppressed that the battery becomes locally high temperature. Specifically, although the thermal conductivities of the first resin film and the second resin film in the first laminate film are low, since the electrode layer is electrically connected to the first metal layer or the second metal layer, the heat generated in the electrode layer and in the vicinity of the electrode layer is likely to be transmitted to the first metal layer, and the heat dissipation of the battery can be improved.

[0063] In addition, since the first laminate film has the first metal layer and the second metal layer, it becomes easy to control the thermal and electrical properties of the first laminate film. For example, if the first metal layer and the second metal layer are electrically insulated, a short circuit between the electrode layer and the counter electrode layer through the first laminate film can be suppressed. Further, for example, if the first metal layer and the second metal layer are arranged overlapping each other, it becomes possible to improve the gas barrier property of the laminate film and the heat dissipation property of the battery.

[0064] Further, for example, the battery according to the 22nd aspect of the present disclosure is the battery according to the 21st aspect, wherein the first laminate film is located between the first metal layer and the second metal layer, and may further have an insulating layer that electrically insulates the first metal layer and the second metal layer.

[0065] Thereby, even if the electrode layer is electrically connected to the first metal layer or the second metal layer, since the first metal layer and the second metal layer are not electrically connected, a short circuit between the electrode layer and the counter electrode layer through the first laminate film can be suppressed.

[0066] Further, for example, the battery according to the 23rd aspect of the present disclosure is the battery according to the 22nd aspect, wherein the heat resistant temperature of the insulating layer may be higher than the heat resistant temperature of the first resin film.

[0067] Thereby, the heat resistance of the battery can be enhanced. Further, even when the battery is exposed to a high temperature, electrical insulation between the first metal layer and the second metal layer can be ensured.

[0068] Further, for example, the battery according to the 24th aspect of the present disclosure is the battery according to the 22nd or 23rd aspect, wherein the thermal conductivity of the material constituting the insulating layer may be higher than the thermal conductivity of the material constituting the first resin film.

[0069] Thereby, the heat transmitted from the electrode layer to the first metal layer is likely to be transmitted to the insulating layer, and the heat dissipation property of the battery can be further improved.

[0070] Further, for example, the battery according to the 25th aspect of the present disclosure is a battery according to any one of the 21st to 24th aspects, and in the plan view, the first laminate film has an overlap region where the first metal layer and the second metal layer overlap, and a non-overlap region where the first metal layer and the second metal layer do not overlap and where the first metal layer or the second metal layer is present.

[0071] Thereby, the gas barrier property of the first laminate film can be enhanced by the overlap region.

[0072] Further, for example, the battery according to the 26th aspect of the present disclosure is a battery according to the 25th aspect, and includes an electrode lead electrically connected to the electrode layer and drawn out to the outside of the power generation element in the plan view, and a counter electrode lead electrically connected to the counter electrode layer and drawn out to the outside of the power generation element in the plan view. The one or more laminate films include a first film portion and a second film portion facing each other so as to sandwich the power generation element. The first film portion is constituted by at least a part of the first laminate film. The one or more laminate films have a lead sealing portion at the ends of the first film portion and the second film portion in the plan view, where the first film portion and the second film portion sandwich the electrode lead and adhere to the electrode lead. In the first film portion, the lead sealing portion is located in the non-overlap region, and the electrode layer may be electrically connected to the first metal layer or the second metal layer via the electrode lead by the electrode lead contacting the first metal layer or the second metal layer in the non-overlap region.

[0073] Thereby, even if the first metal layer or the second metal layer of the first laminate film contacts the electrode lead in the non-overlap region due to the sealing of the power generation element by the one or more laminate films, since the first metal layer and the second metal layer are not electrically connected, a short circuit between the electrode layer and the counter electrode layer via the first laminate film can be suppressed.

[0074] Further, for example, the battery according to the 27th aspect of the present disclosure is the battery according to the 26th aspect, and in a plan view, the length of the overlap region in the direction in which the overlap region and the non-overlap region are arranged may be longer than the length of the lead sealing portion in the direction in which the electrode lead is drawn out.

[0075] Thereby, the gas barrier property of the first laminate film can be further enhanced.

[0076] Further, for example, the battery according to the 28th aspect of the present disclosure is the battery according to any one of the 25th to 27th aspects, and in a plan view, the area of the overlap region may be 30% or more of the area of the first laminate film.

[0077] Thereby, the gas barrier property of the first laminate film can be further enhanced.

[0078] Further, for example, the battery according to the 29th aspect of the present disclosure is the battery according to the 21st aspect, and in a plan view, the first metal layer and the second metal layer are separated without overlapping, and the first laminate film is located between the first metal layer and the second metal layer and may have an insulating portion that electrically insulates the first metal layer and the second metal layer.

[0079] Thereby, even when the first metal layer and the second metal layer are arranged on the same plane, it is possible to ensure electrical insulation between the first metal layer and the second metal layer, and the degree of freedom in arranging the first metal layer and the second metal layer can be increased.

[0080] Further, for example, the battery according to the 30th aspect of the present disclosure is the battery according to the 29th aspect, and the insulating portion may be filled with an insulating material.

[0081] Thereby, the mechanical strength and gas barrier property of the first laminate film can be enhanced.

[0082] Further, for example, the battery according to the 31st aspect of the present disclosure is the battery according to the 29th aspect, and the insulating portion may be formed by insulating a part of the first metal layer or the second metal layer.

[0083] Further, for example, the battery according to the 32nd aspect of the present disclosure is the battery according to the 31st aspect, and the insulation treatment may be performed by oxidation.

[0084] Thereby, the insulating portion can be easily formed.

[0085] Further, for example, the battery according to the 33rd aspect of the present disclosure is the battery according to any one of the 29th to 32nd aspects, and the one or more laminate films include a first film portion and a second film portion that face each other so as to sandwich the power generation element. The first film portion is constituted by at least a part of the first laminate film. The first laminate film faces the main surface of the power generation element with the first resin film and the second resin film interposed therebetween, covers the insulating portion via the first resin film or the second resin film, and in a plan view, It may have an auxiliary layer that overlaps at least a part of the first metal layer and at least a part of the second metal layer.

[0086] Thereby, permeation of moisture or the like via the insulating portion can be reduced.

[0087] Further, for example, the battery according to the 34th aspect of the present disclosure is the battery according to the 33rd aspect, and the auxiliary layer may contain metal as a main component.

[0088] Thereby, permeation of moisture or the like via the insulating portion can be further reduced. Also, the heat dissipation of the battery can be further enhanced.

[0089] Further, for example, the battery according to the 35th aspect of the present disclosure is the battery according to any one of the 21st to 34th aspects, and the power generation element may be sandwiched and sealed between one bent first laminate film.

[0090] As a result, at the folding position of the first laminate film, the power generation element can be sealed without heat-sealing the first laminate film. Therefore, it is not necessary to secure a region for heat-sealing in the vicinity of the folding position, and the projected area of the battery can be reduced.

[0091] Further, for example, the battery according to the 36th aspect of the present disclosure is a battery according to any one of the 21st aspect to the 35th aspect, and includes an electrode lead electrically connected to the electrode layer, and an electrode lead electrically connected to the counter electrode layer. And a heat dissipation auxiliary body connected to the electrode lead or the counter electrode lead.

[0092] As a result, the heat dissipation performance of the battery can be further improved.

[0093] Further, for example, the battery according to the 37th aspect of the present disclosure is a battery according to the 36th aspect, and the one or more laminate films include a first film portion and a second film portion facing each other so as to sandwich the power generation element. The heat dissipation auxiliary body may be sandwiched between the first film portion and the second film portion together with the electrode lead or the counter electrode lead.

[0094] As a result, it becomes easy to bring the electrode lead or the counter electrode lead into close contact with the heat dissipation auxiliary body, and the heat dissipation performance of the battery can be further improved.

[0095] Further, for example, the battery according to the 38th aspect of the present disclosure is a battery according to any one of the 21st aspect to the 37th aspect, and the outermost surface of the battery may have a portion having an emissivity of 0.7 or more at 25°C.

[0096] As a result, the heat dissipation performance of the battery can be further improved.

[0097] Further, for example, the battery according to the 39th aspect of the present disclosure is a battery according to any one of the 21st to 38th aspects, and the outermost surface of the battery may have a portion where the true surface area is more than three times the geometric surface area.

[0098] Thereby, the heat dissipation property of the battery can be further enhanced.

[0099] Further, for example, the method for manufacturing a battery according to the 40th aspect of the present disclosure includes preparing one or more laminate films including a first resin film, a second resin film facing the first resin film, a first metal layer positioned between the first resin film and the second resin film, and a second metal layer positioned between the first resin film and the second resin film; preparing a power generation element having an electrode layer and a counter electrode layer; sandwiching the power generation element with the one or more laminate films; sealing the power generation element with the one or more laminate films; and electrically connecting the electrode layer to the first metal layer or the second metal layer.

[0100] Thereby, a battery with improved heat dissipation property as described above can be manufactured.

[0101] Further, for example, the method for manufacturing a battery according to the 41st aspect of the present disclosure is the method for manufacturing a battery according to the 40th aspect, and includes preparing an electrode terminal electrically connected to the electrode layer and a counter electrode terminal electrically connected to the counter electrode layer. When sealing the power generation element, the electrode layer may be electrically connected to the first metal layer or the second metal layer by bringing the electrode terminal into contact with the first metal layer or the second metal layer.

[0102] Thereby, the manufacturing process of the battery can be simplified.

[0103] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0104] Note that all of the embodiments described below show inclusive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, steps, order of steps, etc. shown in the following embodiments are merely examples and are not intended to limit the present disclosure. In addition, among the components in the following embodiments, the components not described in the independent claims are described as optional components.

[0105] Also, each figure is a schematic diagram and is not necessarily drawn precisely. Therefore, for example, the scales etc. in each figure do not necessarily match. Also, in each figure, substantially the same configurations are denoted by the same reference numerals, and overlapping descriptions are omitted or simplified. Further, in the cross-sectional views described below, for ease of viewing, the thicknesses of the layers, films, and current collectors are exaggerated in the drawings.

[0106] Also, in this specification, terms indicating the relationship between elements such as parallel, terms indicating the shape of elements such as rectangular, and numerical ranges are not expressions representing only strict meanings, but are expressions meaning substantially equivalent ranges, for example, including differences of about several percent.

[0107] Also, in this specification and the drawings, the x-axis, y-axis, and z-axis indicate the three axes of a three-dimensional orthogonal coordinate system. The x-axis and y-axis are respectively, when the planar shape of the power generation element of the battery is rectangular, the direction parallel to the first side of the rectangle and the second side orthogonal to the first side. The z-axis is the direction parallel to the thickness direction and stacking direction of the power generation element and the thickness direction and stacking direction of the portion sandwiching the power generation element of the laminate film.

[0108] In addition, in this specification, the "lamination direction" of the power generation element coincides with the normal direction of the main surface of each layer of the current collector and the battery cell. Also, the "lamination direction" of the power generation element coincides with the direction in which the laminate film sandwiches the power generation element. Further, in this specification, "plan view" refers to the view from a direction perpendicular to the main surface of each component such as a film, a layer, a current collector, and a power generation element, unless otherwise specified. Note that when described as "plan view of a certain surface" such as "plan view of the side surface", it refers to the view when the "certain surface" is viewed from the front.

[0109] In addition, in this specification, the terms "upper" and "lower" do not refer to the upward (vertically upward) and downward (vertically downward) directions in absolute spatial recognition, but are used as terms defined by the relative positional relationship based on the lamination order in the laminated structure. Also, the terms "upper" and "lower" are applicable not only when two components are arranged at intervals and another component exists between the two components, but also when the two components are arranged in close contact and the two components are in contact. In the following description, the negative side of the z-axis is taken as "lower" or "lower side", and the positive side of the z-axis is taken as "upper" or "upper side".

[0110] In addition, in this specification, ordinal numbers such as "first" and "second" do not mean the number or order of components, unless otherwise specified, but are used for the purpose of avoiding confusion of the same type of components and distinguishing the components.

[0111] (Embodiment 1) First, the configuration of the laminate film according to Embodiment 1 will be described. The laminate film according to this embodiment is used for a battery exterior body.

[0112] FIG. 1 is a top view of the laminate film 1 according to the present embodiment. FIG. 2 is a cross-sectional view of the laminate film 1 according to the present embodiment. Specifically, FIG. 1 is a plan view of the laminate film 1 when viewed from the positive side in the z-axis direction. In FIG. 1, the outlines of the first metal layer 21, the second metal layer 22, and the insulating layer 30 are shown by broken lines in the region overlapping the second resin film 12. Further, FIG. 2 represents a cross-section taken along the line II-II shown in FIG. 1.

[0113] As shown in FIGS. 1 and 2, the laminate film 1 includes a first resin film 11, a second resin film 12, a first metal layer 21, a second metal layer 22, and an insulating layer 30. In a third region 43, which will be described later, of the laminate film 1, the first resin film 11, the first metal layer 21, the insulating layer 30, the second metal layer 22, and the second resin film 12 are laminated in this order.

[0114] Further, in plan view, the laminate film 1 has a first region 41 where the first metal layer 21 exists and the second metal layer 22 does not exist, and a second region 42 where the first metal layer 21 does not exist and the second metal layer 22 exists. The first region 41 and the second region 42 are non-overlap regions in plan view where the first metal layer 21 and the second metal layer 22 do not overlap and either the first metal layer 21 or the second metal layer 22 exists. Also, the first region 41 and the second region 42 are regions including portions that are heat-sealed when the laminate film 1 seals the power generation element of the battery. Further, in plan view, the laminate film 1 further has a third region 43 where the first metal layer 21 and the second metal layer 22 exist. The third region 43 is an overlap region in plan view where the first metal layer 21 and the second metal layer 22 overlap. By having the third region 43 where the first metal layer 21 and the second metal layer 22 overlap, the laminate film 1 can enhance the gas barrier property. In the third region 43, an insulating layer 30 is located between the first metal layer 21 and the second metal layer 22, and the first metal layer 21, the insulating layer 30, and the second metal layer 22 are laminated side by side in this order along the z-axis direction.

[0115] In a plan view, the third region 43 is a region including the center of the laminate film 1 in the x-axis direction, and is sandwiched between the first region 41 and the second region 42. Also, in a plan view, the first region 41 is located on the negative x-axis side of the third region 43, and is a region including the end portion of the laminate film 1 on the negative x-axis side. The second region 42 is located on the positive x-axis side of the third region 43, and is a region including the end portion of the laminate film 1 on the positive x-axis side. The first region 41, the third region 43, and the second region 42 are arranged in this order side by side from one end to the other end of the laminate film 1 in the x-axis direction in a plan view. Also, in the example shown in FIG. 1, the first region 41, the second region 42, and the third region 43 are provided over the entire y-axis direction.

[0116] In the example shown in FIG. 1, in a plan view, the area of the third region 43 is larger than the area of the first region 41 and the area of the second region 42. Thereby, the third region 43 where the first metal layer 21 and the second metal layer 22 overlap becomes large, and the gas barrier property of the laminate film 1 can be enhanced. In a plan view, the area of the third region 43 is, for example, 30% or more of the area of the laminate film 1. Thereby, the gas barrier property of the laminate film 1 can be further enhanced. In a plan view, the area of the third region 43 may be 50% or more of the area of the laminate film 1, or may be 80% or more. In this specification, the area in a plan view means the area in a plan view when the folded laminate film 1 is unfolded in the case where the laminate film 1 is used after being folded.

[0117] In a plan view, the shape of the laminate film 1 is rectangular, but is not particularly limited. Also, in a plan view, the shapes of the first resin film 11, the second resin film 12, the first metal layer 21, the second metal layer 22, and the insulating layer 30 are rectangular, but are not particularly limited.

[0118] In the example shown in FIG. 2, the thickness of the laminate film 1 in the first region 41 is the same as the thickness of the laminate film 1 in the second region 42. This makes it possible to facilitate the handling of the laminate film 1. In this specification, having the same thickness means being substantially the same, specifically, meaning that the difference is 5% or less regardless of which of the comparison targets is used as the reference.

[0119] The first resin film 11 and the second resin film 12 are located at the uppermost and lowermost portions of the laminate film 1 and are adhered when sealing the power generation element of the battery. Specifically, the first resin film 11 and the second resin film 12 are heat-sealed during sealing. The first resin film 11 and the second resin film 12 are electrically insulating films. The first resin film 11 and the second resin film 12 are arranged to face each other.

[0120] In the example shown in FIG. 1, in a plan view, the sizes of the first resin film 11 and the second resin film 12 are the same as each other, and the respective contours of the first resin film 11 and the second resin film 12 coincide. Also, in a plan view, the contours of the first resin film 11 and the second resin film 12 coincide with the contour of the laminate film 1.

[0121] Also, as shown in FIG. 2, in the laminate film 1, the first resin film 11 and the second resin film 12 are bent along the shapes of the first metal layer 21, the insulating layer 30, and the second metal layer 22 sandwiched between the first resin film 11 and the second resin film 12. The thickness of each of the first resin film 11 and the second resin film 12 is, for example, uniform. Also, the thickness of the laminate film 1 is thinner than that of the third region 43 where the first metal layer 21 and the second metal layer 22 overlap in at least a part of the first region 41 and the second region 42 where the first metal layer 21 and the second metal layer 22 do not overlap.

[0122] The materials and thicknesses of the first resin film 11 and the second resin film 12 are not particularly limited and are appropriately selected according to sealing performance, mechanical strength, use temperature range, etc. The thickness of each of the first resin film 11 and the second resin film 12 is, for example, 10 μm or more and 50 μm or less. Examples of the materials of the first resin film 11 and the second resin film 12 include polyethylene terephthalate, polypropylene, and polyethylene. The material of the first resin film 11 and the material of the second resin film 12 may be, for example, the same or different.

[0123] The first metal layer 21 and the second metal layer 22 are each located between the first resin film 11 and the second resin film 12. The first metal layer 21 and the second metal layer 22 are electrically insulated by the insulating layer 30. In the example shown in FIG. 2, the lower surface of the first metal layer 21 is in contact with the first resin film 11, and the upper surface of the first metal layer 21 is in contact with the insulating layer 30 and the second resin film 12. Also, in the example shown in FIG. 2, the lower surface of the second metal layer 22 is in contact with the insulating layer 30 and the first resin film 11, and the upper surface of the second metal layer 22 is in contact with the second resin film 12. Note that another layer may be present in at least one of the spaces between the first metal layer 21 and the first resin film 11, between the first metal layer 21 and the second resin film 12, and between the first metal layer 21 and the insulating layer 30. Also, another layer or film may be present in at least one of the spaces between the second metal layer 22 and the first resin film 11, between the second metal layer 22 and the second resin film 12, and between the second metal layer 22 and the insulating layer 30.

[0124] As shown in FIG. 1, in a plan view, the first metal layer 21 and the second metal layer 22 are arranged offset in the x-axis direction. Further, in the laminate film 1, in a plan view, a part of the first metal layer 21 and a part of the second metal layer 22 overlap. The first metal layer 21 is arranged across the entire y-axis direction of the laminate film 1 and extends from the end on the negative x-axis side of the laminate film 1 toward the positive x-axis direction. The second metal layer 22 is arranged across the entire y-axis direction of the laminate film 1 and extends from the end on the positive x-axis side of the laminate film 1 toward the negative x-axis direction. Note that at least one of the first metal layer 21 and the second metal layer 22 may not be arranged across the entire y-axis direction, and the length in the y-axis direction may be shorter than the contour of the laminate film 1.

[0125] Further, in a plan view, the first metal layer 21 and the second metal layer 22 are each arranged so as to overlap at least a part of the insulating layer 30. The first metal layer 21 and the second metal layer 22 each have a portion that bends along the side surface of the insulating layer 30. The first metal layer 21 and the second metal layer 22 each include a portion that overlaps the insulating layer 30 in a plan view and a portion that does not overlap the insulating layer 30 and is located in the same plane as the insulating layer 30, and these two portions are connected by the bent portion.

[0126] In the example shown in FIG. 1, the first metal layer 21 and the second metal layer 22 are completely covered by the first resin film 11 and the second resin film 12 from above and below. In a plan view, in the laminate film 1, the lengths of the first metal layer 21 and the second metal layer 22 in the y-axis direction are the same as the lengths of the first resin film 11, the second resin film 12, and the insulating layer 30 in the y-axis direction. Also, in a plan view, in the laminate film 1, the lengths of the first metal layer 21 and the second metal layer 22 in the x-axis direction are shorter than the lengths of the first resin film 11 and the second resin film 12 in the x-axis direction.

[0127] The materials and thicknesses of the first metal layer 21 and the second metal layer 22 are not particularly limited and are appropriately selected according to, for example, the sealing performance, mechanical strength, and usage environment. The thickness of each of the first metal layer 21 and the second metal layer 22 is, for example, 7 μm or more and 25 μm or less. The thickness of the first metal layer 21 and the thickness of the second metal layer 22 are, for example, the same, but they may also be different. Examples of the materials for each of the first metal layer 21 and the second metal layer 22 include aluminum and nickel. The material of the first metal layer 21 and the material of the second metal layer 22 are, for example, the same, but they may also be different.

[0128] The insulating layer 30 is located between the first metal layer 21 and the second metal layer 22 and electrically insulates the first metal layer 21 and the second metal layer 22. As shown in FIG. 1, in plan view, the insulating layer 30 is disposed at least over the entire area of the third region 43. In the example shown in FIG. 1, in plan view, a part of the insulating layer 30 is also disposed in the first region 41 and the second region 42. The insulating layer 30 is disposed over the entire y-axis direction of the laminate film 1. Further, in the example shown in FIG. 2, in the third region 43, the insulating layer 30 is sandwiched between the first metal layer 21 and the second metal layer 22, in the first region 41, the insulating layer 30 is sandwiched between the first metal layer 21 and the second resin film 12, and in the second region 42, the insulating layer 30 is sandwiched between the second metal layer 22 and the first resin film 11. Note that the insulating layer 30 may not be disposed in the first region 41 and the second region 42.

[0129] The material and thickness of the insulating layer 30 are not particularly limited and are appropriately selected according to the sealing performance, mechanical strength, use environment, etc. The thickness of the insulating layer 30 is, for example, 6 μm or more and 25 μm or less. Also, at the position where the first resin film 11, the second resin film 12, and the insulating layer 30 overlap in plan view, the thickness of the insulating layer 30 may be thinner than the thickness of the first resin film 11 and the thickness of the second resin film 12. Thereby, the stress applied to the first metal layer 21 and the second metal layer 22 from the end portion of the insulating layer 30 can be reduced. Also, the thickness of the laminate film 1 can be reduced, and the volumetric energy density of the battery can be increased. As the material of the insulating layer 30, for example, a resin is used. Examples of the resin used for the material of the insulating layer 30 include polyethylene terephthalate, polypropylene, polyethylene naphthalate, polyamide, polyimide, and the like. The resin used for the material of the insulating layer 30 may be a thermoplastic resin or a thermosetting resin. Also, an inorganic material such as ceramics may be used for the material of the insulating layer 30. Also, the insulating layer 30 may be formed by performing an insulation treatment such as oxidizing a part of the first metal layer 21 or the second metal layer 22. The method of the insulation treatment is not particularly limited. For example, as the insulation treatment, oxidation using an oxidizing agent may be performed, or laser irradiation in an oxygen atmosphere may be performed.

[0130] The material of the insulating layer 30 is, for example, different from the materials of the first resin film 11 and the second resin film 12, but may be the same.

[0131] The heat resistance temperature of the insulating layer 30 is, for example, different from the heat resistance temperatures of the first resin film 11 and the second resin film 12. The heat resistance temperature of the insulating layer 30 is, for example, higher than the heat resistance temperatures of the first resin film 11 and the second resin film 12. Thereby, even when the laminate film 1 is exposed to a high temperature, electrical insulation between the first metal layer 21 and the second metal layer 22 can be ensured. In the first resin film 11 and the second resin film 12, the heat resistance temperature is a softening temperature such as a melting point. When a thermoplastic resin is used for the insulating layer 30, the heat resistance temperature is a softening temperature such as a melting point. Also, when a thermosetting resin or an inorganic material is used for the insulating layer 30, the heat resistance temperature is a decomposition temperature. The heat resistance temperature of the insulating layer 30 is, for example, 160°C or higher, may be 180°C or higher, or may be 200°C or higher.

[0132] The breaking strength of the insulating layer 30 is, for example, higher than the breaking strengths of the first resin film 11 and the second resin film 12. Thereby, the mechanical strength of the laminate film 1 is improved, and when an external force such as a puncture wound is applied to a battery using the laminate film 1 as a battery exterior body, the battery is more easily protected.

[0133] The thermal conductivity of the material constituting the insulating layer 30 is, for example, higher than the thermal conductivities of the materials constituting the first resin film 11 and the second resin film 12. Thereby, the heat dissipation performance when the laminate film 1 is used for a battery as a battery exterior body can be enhanced.

[0134] The sealing using the laminate film 1 according to this embodiment can be performed, for example, by preparing two laminate films 1, disposing the object to be sealed between the two laminate films 1, sandwiching the object to be sealed, and heat-sealing the outer peripheral portions of the two laminate films 1 in a plan view to form a bag shape. Specifically, the object to be sealed is sealed by heat-sealing the four sides of the two laminate films 1 in a plan view. The object to be sealed is, for example, a power generation element of a battery. The vacuum sealing of the object to be sealed can also be performed by performing at least the last heat-sealing in the operation of sealing with the laminate film 1 in a reduced-pressure atmosphere. Further, the number of heat-sealing locations can be reduced by folding one laminate film 1 and using it. For example, the laminate film 1 is folded back in the y-axis direction, and three sides other than the folding position of the folded-back laminate film 1 in a plan view are heat-sealed. Thereby, the area required for heat-sealing can be reduced, and the area of the laminate film 1 in a plan view after sealing can be made smaller.

[0135] The heat-sealing of the laminate film 1 is performed, for example, at the position of the heat-sealing portion 90 shown in FIG. 2. The heat-sealing portion 90 is located at the end of the laminate film 1 and in the first region 41 and the second region 42. For example, heat-sealing is performed by sandwiching the lead connected to one of the positive electrode and the negative electrode at the heat-sealing portion 90 in the first region 41, and heat-sealing is performed by sandwiching the lead connected to the other of the positive electrode and the negative electrode at the heat-sealing portion 90 in the second region 42. Even when the first metal layer 21 and the second metal layer 22 are electrically contacted with the leads of the positive and negative electrodes by heat-sealing, since the first metal layer 21 and the second metal layer 22 are electrically insulated from each other, it is possible to suppress the short-circuit between the leads of the positive and negative electrodes. The same applies when using terminals other than the leads for the battery.

[0136] In the heat fusion of the laminate film 1 in a portion where there are no terminals such as leads, the risk of short - circuit between the positive and negative electrodes through the laminate film 1 is relatively small. The reason is that there is no localization of a portion with a large pressing pressure as in the case of pressing the laminate film against terminals such as leads for heat fusion. When sealing by heat - fusing the laminate film 1 in a portion where there are no terminals such as leads, in order to further reduce the risk of short - circuit through the laminate film 1, for example, a resin film for preventing short - circuit may be further sandwiched between the upper and lower laminate films 1 of the heat - fused portion 90. Also, devising the vertical arrangement of the upper and lower laminate films 1 arranged vertically is also effective in suppressing short - circuits. For example, by sandwiching the power - generating element between the laminate film 1 in the orientation shown in FIG. 2 and the laminate film 1 with the vertical orientation reversed from that shown in FIG. 2, even when contact of the metal layer occurs between the upper and lower laminate films 1 at the heat - fused position, it is possible to make it difficult for a short - circuit to occur between the positive and negative electrodes.

[0137] [Modification Example 1] Hereinafter, Modification Example 1 of Embodiment 1 will be described. In the description of Modification Example 1 below, the description will focus on the differences from the above - mentioned Embodiment 1, and the description of the common points will be omitted or simplified. The same applies to Modification Examples 2 and later described below. In the description of each modification example, the description will focus on the differences from the above - mentioned Embodiment 1 and each modification example of Embodiment 1, and the description of the common points will be omitted or simplified.

[0138] FIG. 3 is a cross - sectional view of the laminate film 1A according to this modification example. The top view of the laminate film 1A according to this modification example is the same as the top view of the laminate film 1 shown in FIG. 1, for example.

[0139] As shown in FIG. 3, the laminate film 1A according to this modification is mainly different from the laminate film 1 according to the first embodiment in that the thickness is uniform. That is, the thickness of the laminate film 1A in the first region 41, the thickness of the laminate film 1A in the second region 42, and the thickness of the laminate film 1A in the third region 43 are the same. Since the thickness of the laminate film 1A is uniform, it is possible to suppress a decrease in the accuracy of the manufacturing process of the battery using the laminate film 1A. In addition, the flatness of the battery using the laminate film 1A as the battery exterior can be improved.

[0140] As shown in FIG. 3, in the laminate film 1A, the first resin film 11 and the second resin film 12 each have a step corresponding to the shape of the first metal layer 21, the second metal layer 22, and the insulating layer 30 on the surfaces on the sides of the first metal layer 21, the second metal layer 22, and the insulating layer 30, and the thickness is changing. Further, the first metal layer 21 and the second metal layer 22 each have a step corresponding to the shape of the insulating layer 30 on the surface on the side of the insulating layer 30, and the thickness is changing. In this way, in the laminate film 1A, by combining the first resin film 11, the second resin film 12, the first metal layer 21, and the second metal layer 22 having steps, the overall thickness of the laminate film 1A becomes uniform. The laminate film 1A is manufactured, for example, using a foil or the like in which steps are formed in advance as the first metal layer 21 and the second metal layer 22. Further, the steps of the first resin film 11 and the second resin film 12 may be formed before the manufacture of the laminate film 1A, or may be formed by sandwiching the first metal layer 21, the second metal layer 22, and the insulating layer 30 between the first resin film 11 and the second resin film 12 and pressing them during the manufacture of the laminate film 1A.

[0141] Further, the first metal layer 21 and the second metal layer 22 may not have a step. FIG. 4 is a cross-sectional view of another laminate film 1B according to this modified example. As shown in FIG. 4, in the laminate film 1B, the first metal layer 21 and the second metal layer 22 have no step and have a uniform thickness, and the first resin film 11 and the second resin film 12 each have a step and the thickness is changing. In the laminate film 1B, the thicknesses of the first metal layer 21, the second metal layer 22, and the insulating layer 30 are uniform.

[0142] [Modified Example 2] Next, a modified example 2 of Embodiment 1 will be described.

[0143] FIG. 5 is a top view of a laminate film 1C according to this modified example. FIG. 6 is a cross-sectional view of the laminate film 1C according to this modified example. Specifically, FIG. 5 is a plan view of the laminate film 1C when viewed from the positive side in the z-axis direction. Further, in FIG. 5, in the region overlapping the second resin film 12, the contours of the first metal layer 21, the second metal layer 22, and the insulating layer 30 are shown by broken lines. Further, FIG. 6 shows a cross-section along line VI-VI shown in FIG. 5.

[0144] As shown in FIGS. 5 and 6, the laminate film 1C according to this modified example is mainly different from the laminate film 1A according to the modified example 1 of Embodiment 1 in that the lengths of the first metal layer 21 and the second metal layer 22 in the y-axis direction are slightly shorter than the lengths of the first resin film 11 and the second resin film 12 in the y-axis direction.

[0145] As shown in FIG. 5, in the laminate film 1C, in a plan view, both ends of the first metal layer 21 and the second metal layer 22 in the y-axis direction are located inside both ends of the first resin film 11 and the second resin film 12 in the y-axis direction. Thereby, the reliability of the battery using the laminate film 1C can be further enhanced. Specifically, when heat-sealing the end portion of the laminate film 1C in the y-axis direction, by adopting a structure in which the first metal layer 21 and the second metal layer 22 are not exposed on the end face of the laminate film 1C, even if the first resin film 11 and the second resin film 12 in the third region 43 melt during heat-sealing, the contact between the first metal layer 21 and the second metal layer 22 is less likely to occur. Therefore, the reliability of the battery using the laminate film 1C is further improved.

[0146] The difference between the lengths of the first metal layer 21 and the second metal layer 22 in the y-axis direction and the lengths of the first resin film 11 and the second resin film 12 in the y-axis direction is, for example, 1 mm or more and 10 mm or less. Also, the difference between the lengths of the first metal layer 21 and the second metal layer 22 in the y-axis direction and the lengths of the first resin film 11 and the second resin film 12 in the y-axis direction is, for example, narrower than the width at which the heat-sealing process is performed at the end of the laminate film 1C when the laminate film 1C is used as a battery exterior body.

[0147] In the example shown in FIG. 5, the length of the insulating layer 30 in the y-axis direction is the same as the lengths of the first resin film 11 and the second resin film 12 in the y-axis direction and is longer than the lengths of the first metal layer 21 and the second metal layer 22 in the y-axis direction. Thereby, the contact between the first metal layer 21 and the second metal layer 22 can be further suppressed, and the reliability of the battery using the laminate film 1C can be further improved.

[0148] [Modification Example 3] Next, Modification Example 3 of Embodiment 1 will be described.

[0149] FIG. 7 is a top view of the laminate film 1D according to this modified example. FIG. 8 is a cross-sectional view of the laminate film 1D according to this modified example. Specifically, FIG. 7 is a plan view of the laminate film 1D when viewed from the positive side in the z-axis direction. Further, in FIG. 7, in the region overlapping the second resin film 12, the outlines of the first metal layer 21, the second metal layer 22, the insulating layer 30, and the intermediate layer 31 are indicated by broken lines. Further, FIG. 8 shows a cross-section taken along line VIII-VIII shown in FIG. 7.

[0150] As shown in FIGS. 7 and 8, the laminate film 1D according to this modified example mainly differs from the laminate film 1A according to Modified Example 1 of Embodiment 1 in that it further includes an intermediate layer 31.

[0151] As shown in FIG. 8, the laminate film 1D includes an intermediate layer 31 located between the first metal layer 21 and the insulating layer 30 and an intermediate layer 31 located between the second metal layer 22 and the insulating layer 30. By providing the laminate film 1D with the intermediate layer 31, for example, the options for the material of the insulating layer 30 can be expanded. For example, the intermediate layer 31 is a bonding layer that bonds the first metal layer 21 or the second metal layer 22 and the insulating layer 30. Thereby, when the bonding property between the insulating layer 30 and the first metal layer 21 or the second metal layer 22 is weak, the insulating layer 30 and the first metal layer 21 or the second metal layer 22 can be firmly bonded. In this case, as the material of the intermediate layer 31, a material having higher adhesiveness to the first metal layer 21 and the second metal layer 22 than the insulating layer 30, such as an adhesive resin, is used. Note that the intermediate layer 31 may be a layer other than a bonding layer, such as a high-strength layer having a higher breaking strength than the insulating layer 30.

[0152] [Modified Example 4] Next, Modified Example 4 of Embodiment 1 will be described.

[0153] FIG. 9 is a top view of the laminate film 1E according to this modified example. FIG. 10 is a cross-sectional view of the laminate film 1E according to this modified example. Specifically, FIG. 9 is a plan view of the laminate film 1E when viewed from the positive side in the z-axis direction. In FIG. 9, the contours of the first metal layer 21, the second metal layer 22, the third metal layer 23, and the insulating layer 30 are shown by broken lines in the region overlapping the second resin film 12. Further, FIG. 10 shows a cross-section along the X-X line shown in FIG. 9.

[0154] As shown in FIGS. 9 and 10, the laminate film 1E according to this modified example mainly differs from another laminate film 1B according to Modified Example 1 of Embodiment 1 in that it further includes a third metal layer 23.

[0155] As shown in FIGS. 9 and 10, the laminate film 1E has a first region 41 and a second region 42 in a plan view. In the laminate film 1E, in the first region 41, neither the second metal layer 22 nor the third metal layer 23 exists. Also, in the laminate film 1E, in the second region 42, neither the first metal layer 21 nor the third metal layer 23 exists. Further, the laminate film 1E has, in a plan view, a third region 43a where the third metal layer 23 exists and neither the first metal layer 21 nor the second metal layer 22 exists, a fourth region 44 where the first metal layer 21 and the third metal layer 23 exist and the second metal layer 22 does not exist, and a fifth region 45 where the second metal layer 22 and the third metal layer 23 exist and the first metal layer 21 does not exist. In the fourth region 44, an insulating layer 30 is positioned between the first metal layer 21 and the third metal layer 23, and the first metal layer 21, the insulating layer 30, and the third metal layer 23 are laminated in this order along the z-axis direction. Also, in the fifth region 45, an insulating layer 30 is positioned between the second metal layer 22 and the third metal layer 23, and the second metal layer 22, the insulating layer 30, and the third metal layer 23 are laminated in this order along the z-axis direction.

[0156] In plan view, the third region 43a is a region including the center of the laminate film 1E in the x-axis direction, and is sandwiched between the first region 41 and the second region 42. Also, in plan view, the fourth region 44 is located between the first region 41 and the third region 43a, and the fifth region 45 is located between the second region 42 and the third region 43a. The first region 41, the fourth region 44, the third region 43a, the fifth region 45, and the second region 42 are arranged in this order side by side from one end to the other end of the laminate film 1E in plan view in the x-axis direction. Also, in the example shown in FIG. 9, the first region 41, the second region 42, the third region 43a, the fourth region 44, and the fifth region 45 are provided over the entire y-axis direction.

[0157] The third metal layer 23 is located between the first resin film 11 and the second resin film 12. The third metal layer 23 is electrically insulated from each of the first metal layer 21 and the second metal layer 22 by an insulating layer 30. In the example shown in FIG. 10, the upper surface of the third metal layer 23 is in contact with the second resin film 12, and the lower surface of the third metal layer 23 is in contact with the insulating layer 30 and the first resin film 11. Note that another layer may exist in at least one of the space between the third metal layer 23 and the first resin film 11, the space between the third metal layer 23 and the second resin film 12, and the space between the third metal layer 23 and the insulating layer 30.

[0158] As shown in FIG. 9, in plan view, the first metal layer 21 and the third metal layer 23 are arranged offset in the x-axis direction, and the second metal layer 22 and the third metal layer 23 are arranged offset in the x-axis direction. Also, in the laminate film 1E, in plan view, a part of the first metal layer 21 and a part of the third metal layer 23 overlap, and a part of the second metal layer 22 and a part of the third metal layer 23 overlap. The third metal layer 23 is arranged across the entire y-axis direction of the laminate film 1E. Also, in plan view, both ends of the third metal layer 23 in the x-axis direction are located inside both ends of the first resin film 11 and the second resin film 12 in the x-axis direction. Also, in plan view, the third metal layer 23 is arranged so as to partially overlap with the insulating layer 30. Note that the third metal layer 23 does not necessarily need to be arranged across the entire y-axis direction, and the length in the y-axis direction may be shorter than the contour of the laminate film 1E.

[0159] In the example shown in FIG. 9, the third metal layer 23 is completely covered by the first resin film 11 and the second resin film 12 from above and below. In plan view, in the laminate film 1E, the length of the third metal layer 23 in the y-axis direction is the same as the lengths of the first resin film 11, the second resin film 12, and the insulating layer 30 in the y-axis direction. Also, in plan view, in the laminate film 1E, the length of the third metal layer 23 in the x-axis direction is shorter than the lengths of the first resin film 11 and the second resin film 12 in the x-axis direction.

[0160] Also, as shown in FIG. 10, in the laminate film 1E, the first metal layer 21 and the second metal layer 22 are located at the same position in the thickness direction of the laminate film 1E and are located on the same plane. Further, the third metal layer 23 is different in position from the first metal layer 21 and the second metal layer 22 in the thickness direction of the laminate film 1E. The third metal layer 23 is located between the first metal layer 21 and the second resin film 12 and between the second metal layer 22 and the second resin film 12. Note that the first metal layer 21 and the second metal layer 22 may be different in position in the thickness direction of the laminate film 1E. For example, in the thickness direction of the laminate film 1E, the first metal layer 21 and the second metal layer 22 may be arranged so as to sandwich the third metal layer 23.

[0161] The material and thickness of the third metal layer 23 are not particularly limited and are appropriately selected according to the sealing performance, mechanical strength, use environment, etc. The thickness of the third metal layer 23 is, for example, 7 μm or more and 25 μm or less. The thickness of the third metal layer 23 may be greater than the thickness of the first metal layer 21 and the thickness of the second metal layer 22. Thereby, the strength of the central portion of the laminate film 1E where the power generation elements of the battery are to be arranged can be increased. The thickness of the third metal layer 23 may be the same as the thickness of the first metal layer 21 and the thickness of the second metal layer 22, or may be less than the thickness of the first metal layer 21 and the thickness of the second metal layer 22. Examples of the material of the third metal layer 23 include aluminum and nickel. As the material of the third metal layer 23, a metal having a higher breaking strength than aluminum and nickel may be used. The material of the third metal layer 23 may be different from at least one of the material of the first metal layer 21 and the material of the second metal layer 22, or may be the same.

[0162] The laminate film 1E includes, as two insulating layers 30, an insulating layer 30 positioned between the first metal layer 21 and the third metal layer 23 and electrically insulating the first metal layer 21 and the third metal layer 23, and an insulating layer 30 positioned between the second metal layer 22 and the third metal layer 23 and electrically insulating the second metal layer 22 and the third metal layer 23. As shown in FIG. 9, in plan view, one of the two insulating layers 30 is disposed over at least the entire area of the fourth region 44, and the remaining one is disposed over at least the entire area of the fifth region 45. In the example shown in FIG. 9, in plan view, a part of the insulating layer 30 is also disposed in the first region 41, the second region 42, and the third region 43a. Note that the insulating layer 30 may not be disposed in the first region 41, the second region 42, and the third region 43a.

[0163] In the laminate film 1E, the gas barrier property can be enhanced by the third metal layer 23 that partially overlaps the first metal layer 21 and the second metal layer 22 in plan view. Further, the third metal layer 23 not located at the heat fusion part 90 can widen the selection range of the specifications and manufacturing methods of the first metal layer 21, the second metal layer 22, and the third metal layer 23.

[0164] Note that in the laminate film 1E, the insulating layer 30 is divided into two and disposed corresponding to the fourth region 44 and the fifth region 45, but the two insulating layers 30 may be connected. That is, as shown in FIGS. 11 and 12, one insulating layer 30 may be formed from the fourth region 44 to the fifth region 45. FIG. 11 is a top view of another laminate film 1F according to this modification example. FIG. 12 is a cross-sectional view of another laminate film 1F according to this modification example. Specifically, FIG. 11 is a plan view of the laminate film 1F when viewed from the positive side in the z-axis direction. Also, in FIG. 11, in the region overlapping the first resin film 11, the contours of the first metal layer 21, the second metal layer 22, the third metal layer 23, and the insulating layer 30 are shown by broken lines. Further, FIG. 12 represents a cross-section taken along line XII-XII shown in FIG. 11.

[0165] As shown in FIGS. 11 and 12, the laminate film 1F includes an insulating layer 30 that is located between the first metal layer 21 and the third metal layer 23 and electrically insulates the first metal layer 21 and the third metal layer 23, and a portion that is located between the second metal layer 22 and the third metal layer 23 and electrically insulates the second metal layer 22 and the third metal layer 23. In the example shown in FIG. 11, in a plan view, the insulating layer 30 is disposed over the entire areas of at least the fourth region 44, the third region 43a, and the fifth region 45.

[0166] [Manufacturing Method] Subsequently, a method for manufacturing the laminate film according to the above-described Embodiment 1 and each modification of Embodiment 1 will be described.

[0167] FIG. 13 is a flowchart showing an example of a method for manufacturing the laminate film according to Embodiment 1 and each modification of Embodiment 1. Hereinafter, the example of the manufacturing method of the above-described laminate film 1B will be mainly described. Note that the manufacturing method described below is an example, and the manufacturing method of the laminate film according to Embodiment 1 and each modification of Embodiment 1 is not limited to the following example.

[0168] As shown in FIG. 13, first, a first resin film 11, a first metal layer 21, an insulating layer 30, a second metal layer 22, and a second resin film 12 are prepared (step S11). As the first metal layer 21 and the second metal layer 22, for example, metal foils are prepared. Further, the first metal layer 21 and the second metal layer 22 may be prepared by forming a metal film on the first resin film 11 or the second resin film 12 by vapor deposition or the like. As the insulating layer 30, for example, an insulating resin film is prepared. The insulating layer 30 may be formed and prepared by performing a resin coat, a ceramic coat, or the like on the first metal layer 21 or the second metal layer 22.

[0169] Note that when manufacturing the laminate film 1D, an intermediate layer 31 is further prepared. When manufacturing the laminate films 1E and 1F, a third metal layer 23 is further prepared.

[0170] Further, a step may be formed in at least one of the first resin film 11, the second resin film 12, the first metal layer 21, and the second metal layer 22 prepared as necessary.

[0171] Next, the first resin film 11, the first metal layer 21, the insulating layer 30, the second metal layer 22, and the second resin film 12 are laminated (step S12). Specifically, the second resin film 12 faces the first resin film 11, the first metal layer 21 and the second metal layer 22 are located between the first resin film 11 and the second resin film 12, and the first metal layer 21 and the second metal layer 22 are electrically insulated by the insulating layer 30 located between the first metal layer 21 and the second metal layer 22. The first resin film 11, the first metal layer 21, the insulating layer 30, the second metal layer 22, and the second resin film 12 are laminated. Further, in step S12, in a plan view, a first region 41 where the first metal layer 21 exists and the second metal layer 22 does not exist, a second region 42 where the first metal layer 21 does not exist and the second metal layer 22 exists, and a third region 43 where the first metal layer 21 and the second metal layer 22 exist are formed on the laminate film 1B. The first resin film 11, the first metal layer 21, the insulating layer 30, the second metal layer 22, and the second resin film 12 are laminated.

[0172] Next, the first resin film 11, the first metal layer 21, the insulating layer 30, the second metal layer 22, and the second resin film 12 are integrated (step S13). The integration in step S13 is performed, for example, by thermal fusion or adhesion using an adhesive. When thermal fusion is performed, for example, the first resin film 11, the first metal layer 21, the insulating layer 30, the second metal layer 22, and the second resin film 12 are hot-pressed from both sides in the lamination direction.

[0173] When the laminate films according to Embodiment 1 other than the laminate film 1A and each modification of Embodiment 1 are manufactured, the lamination order and the like are appropriately adjusted in step S12.

[0174] Further, in step S12 and step S13, the first resin film 11, the first metal layer 21, the insulating layer 30, the second metal layer 22, and the second resin film 12 may all be laminated and integrally formed at once, but it is not limited thereto. For example, a part of the first resin film 11, the first metal layer 21, the insulating layer 30, the second metal layer 22, and the second resin film 12 may be laminated and integrated, and the laminated parts may be further laminated and integrated. That is, at least one of step S11, step S12, and step S13 may be performed separately. Also, the order of step S11, step S12, and step S13 is not limited to the above example.

[0175] (Embodiment 2) Next, the configuration of the laminate film according to Embodiment 2 will be described. The laminate film according to the present embodiment is used for a battery exterior body. The laminate film according to the present embodiment is the same as the above-described Embodiment 1 and each modification of Embodiment 1 in that it has a first region 41 and a second region 42, but is different from the above-described Embodiment 1 and each modification of Embodiment 1 in that it does not have a third region 43, a third region 43a, a fourth region 44, and a fifth region 45. In the following description, the description will focus on the differences from the above-described Embodiment 1 and each modification of Embodiment 1, and the description of the common points will be omitted or simplified.

[0176] FIG. 14 is a top view of the laminate film 2 according to the present embodiment. FIG. 15 is a cross-sectional view of the laminate film 2 according to the present embodiment. Specifically, FIG. 14 is a plan view of the laminate film 2 when viewed from the positive side in the z-axis direction. Also, in FIG. 14, in the region overlapping the second resin film 12, the contours of the first metal layer 21, the second metal layer 22, and the insulating portion 35 are shown by broken lines. Further, FIG. 15 shows a cross-section taken along line XV-XV shown in FIG. 14.

[0177] As shown in FIGS. 14 and 15, the laminate film 2 according to the present embodiment mainly differs from the laminate film 1 according to the first embodiment in that it includes an insulating portion 35 instead of the insulating layer 30, and in that the first metal layer 21 and the second metal layer 22 do not overlap each other in a plan view and do not have the third region 43.

[0178] As shown in FIGS. 14 and 15, in the laminate film 2, in a plan view, the first metal layer 21 and the second metal layer 22 are separated from each other without overlapping. Therefore, the laminate film 2 has the first region 41 and the second region 42 in the plan view, similar to the laminate film 1, but does not have the third region 43 that the laminate film 1 has. In the laminate film 2, the first metal layer 21 and the second metal layer 22 are electrically insulated by the insulating portion 35. Also, in the laminate film 2, the first metal layer 21 and the second metal layer 22 are at the same position in the thickness direction of the laminate film 2 and are located on the same plane as a whole.

[0179] In the examples shown in FIGS. 14 and 15, the first metal layer 21 has a length and an area in the x-axis direction different from those of the second metal layer 22 and is larger than the second metal layer 22 in a plan view. Note that the first metal layer 21 may have the same length and area in the x-axis direction as the second metal layer 22.

[0180] The insulating portion 35 is a gap located between the first metal layer 21 and the second metal layer 22 and insulates the first metal layer 21 and the second metal layer 22. The insulating portion 35 is located between the first region 41 and the second region 42 in a plan view. In a plan view, the first region 41, the insulating portion 35, and the second region 42 are arranged in this order along the x-axis direction. Also, the insulating portion 35 is also located between the first resin film 11 and the second resin film 12. The insulating portion 35 is surrounded by the first metal layer 21, the second metal layer 22, the first resin film 11, and the second resin film 12. The insulating portion 35 is arranged across the entire y-axis direction of the laminate film 2. Note that a part of the insulating portion 35, which is a gap, may be filled with the first resin film 11 or the second resin film 12.

[0181] In the example shown in FIG. 14, the insulating portion 35 is linear in a plan view. Note that the shape of the insulating portion 35 in the plan view is not particularly limited, and it may be wavy or double-line, or may be a geometric shape or a non-linear shape.

[0182] In the plan view, the width of the insulating portion 35 (the length in the x-axis direction), that is, the distance between the first metal layer 21 and the second metal layer 22 is, for example, 5 mm or more and 20 mm or less. Thereby, while ensuring electrical insulation between the first metal layer 21 and the second metal layer 22, permeation of moisture or the like through the insulating portion 35 can be suppressed.

[0183] The heat fusion of the laminate film 2 is performed, for example, at the positions of the heat fusion portions 90 located in the first region 41 and the second region 42 shown in FIG. 15, similarly to the laminate film 1. Thereby, even when the first metal layer 21 and the second metal layer 22 are electrically contacted with the positive and negative terminal electrodes by heat sealing, since the first metal layer 21 and the second metal layer 22 are electrically insulated, short circuit between the positive and negative terminal electrodes can be suppressed.

[0184] [Modification Example 1] Hereinafter, Modification Example 1 of Embodiment 2 will be described. In the description of the following Modification Example 1, the description will be centered on the differences from the above Embodiment 1, each modification example of Embodiment 1, and Embodiment 2, and the description of the common points will be omitted or simplified. The same applies to Modification Examples 2 and subsequent modification examples described below. In the description of each modification example, the description will be centered on the differences from the above Embodiment 1, each modification example of Embodiment 1, Embodiment 2, and each modification example of Embodiment 2, and the description of the common points will be omitted or simplified.

[0185] FIG. 16 is a top view of the laminate film 2A according to this modified example. FIG. 17 is a cross-sectional view of the laminate film 2A according to this modified example. Specifically, FIG. 16 is a plan view of the laminate film 2A when viewed from the positive side in the z-axis direction. In FIG. 16, in the region overlapping the second resin film 12, the contours of the first metal layer 21, the second metal layer 22, and the insulating portion 36 are indicated by broken lines. Further, FIG. 17 shows a cross-section taken along line XVII-XVII shown in FIG. 16.

[0186] As shown in FIGS. 16 and 17, the laminate film 2A according to this modified example is mainly different from the laminate film 2 according to Embodiment 2 in that it includes an insulating portion 36 instead of the insulating portion 35.

[0187] The insulating portion 36 is the same as the insulating portion 35 except that it is made of an insulating material instead of, for example, a void. The insulating material is, for example, an inorganic material such as resin or ceramics. As the insulating material constituting the insulating portion 36, the materials exemplified as the material of the insulating layer 30 above can be used. Further, the insulating portion 36 may be formed by performing an insulation treatment such as oxidizing a part of the first metal layer 21 or the second metal layer 22 in the metal layer in which the first metal layer 21 and the second metal layer 22 are integrated. That is, the insulating portion 36 may contain an insulating material containing a metal contained in the first metal layer 21 or the second metal layer 22 such as a metal oxide as a constituent element.

[0188] Since the insulating portion 36 is made of an insulating material, the gas barrier property of the laminate film 2A can be improved. In particular, when the insulating portion 36 is made of an inorganic material, the gas barrier property of the laminate film 2A can be effectively improved.

[0189] [Modified Example 2] Next, Modified Example 2 of Embodiment 2 will be described.

[0190] FIG. 18 is a top view of the laminate film 2B according to this modified example. FIG. 19 is a cross-sectional view of the laminate film 2B according to this modified example. Specifically, FIG. 18 is a plan view of the laminate film 2B when viewed from the positive side in the z-axis direction. Further, in FIG. 18, in the region overlapping the second resin film 12, the contours of the first metal layer 21, the second metal layer 22, and the insulating portion 35 are indicated by broken lines. Further, FIG. 19 represents a cross-section taken along the XIX-XIX line shown in FIG. 18.

[0191] As shown in FIGS. 18 and 19, the laminate film 2B according to this modified example mainly differs from the laminate film 2 according to Embodiment 2 in that it further includes an auxiliary layer 50.

[0192] The auxiliary layer 50 covers the insulating portion 35 so as to face the insulating portion 35 through the second resin film 12 in a plan view. Thereby, the intrusion of moisture and the like through the insulating portion 35 can be suppressed, and the gas barrier property of the laminate film 2B can be enhanced. The auxiliary layer 50 is joined to the second resin film 12.

[0193] In the example shown in FIG. 18, the auxiliary layer 50 completely covers the insulating portion 35 in a plan view. The auxiliary layer 50 is in contact with the surface of the second resin film 12 on the side opposite to the insulating portion 35 side. Note that the auxiliary layer 50 may cover the insulating portion 35 through the first resin film 11. Further, the auxiliary layer 50 may not completely cover the insulating portion 35 in a plan view.

[0194] The auxiliary layer 50 overlaps a part of the first metal layer 21 and a part of the second metal layer 22 in plan view. The auxiliary layer 50 may overlap the entire first metal layer 21 and the entire second metal layer 22 in plan view. The auxiliary layer 50 is disposed so as to straddle from the first region 41 to the second region 42 in plan view. In the example shown in FIG. 18, in the y-axis direction, both ends of the auxiliary layer 50 overlap both ends of the first resin film 11 and both ends of the second resin film 12. In the y-axis direction, both ends of the auxiliary layer 50 may be located inside both ends of the first resin film 11 and both ends of the second resin film 12.

[0195] The water vapor transmission rate of the auxiliary layer 50 is lower than, for example, the water vapor transmission rates of the first resin film 11 and the second resin film 12. The auxiliary layer 50 is made of a material with low moisture permeability such as a metal or an inorganic material. The auxiliary layer 50 is, for example, a metal foil or a metal film containing a metal as a main component. The "main component" means a component that is more than 50% by mass of the auxiliary layer 50. The joining of the second resin film 12 and the auxiliary layer 50 is performed, for example, by thermal fusion or adhesion using an adhesive. The auxiliary layer 50 may be formed on the second resin film 12 by vapor deposition or the like.

[0196] Note that the laminated film 2B may include an insulating portion 36 instead of the insulating portion 35.

[0197] [Manufacturing Method] Subsequently, a method for manufacturing the laminated film according to the above-described Embodiment 2 and each modification of Embodiment 2 will be described. In the following description, the description will focus on the differences from the method for manufacturing the laminated film according to the above-described Embodiment 1 and each modification of Embodiment 1, and the description of the common points will be omitted or simplified.

[0198] FIG. 20 is a flowchart showing an example of a method for manufacturing a laminate film according to Embodiment 2 and each modification of Embodiment 2. Hereinafter, an example of the method for manufacturing the above laminate film 2 will be mainly described. Note that the manufacturing method described below is an example, and the manufacturing method of the laminate film according to Embodiment 2 and each modification of Embodiment 2 is not limited to the following example.

[0199] As shown in FIG. 20, first, a first resin film 11, a first metal layer 21, a second metal layer 22, and a second resin film 12 are prepared (step S21). As the first metal layer 21 and the second metal layer 22, for example, individual metal foils or metal films are prepared. As the first metal layer 21 and the second metal layer 22, one metal layer such as a metal foil or a metal film in which the first metal layer 21 and the second metal layer 22 are integrated may be prepared. When manufacturing the laminate film 2B, an auxiliary layer 50 is further prepared.

[0200] Next, an insulating portion 35 that is located between the first metal layer 21 and the second metal layer 22 and electrically insulates the first metal layer 21 and the second metal layer 22 is formed (step S22). At this time, in a plan view, the first metal layer 21 and the second metal layer 22 are arranged so as not to overlap and be separated. At least a part of the process of step S22 may be performed during step S23 described later.

[0201] When individual metal foils or metal films are prepared as the first metal layer 21 and the second metal layer 22, the insulating portion 35 is formed by arranging the first metal layer 21 and the second metal layer 22 so as not to overlap and be separated. When a metal layer in which the first metal layer 21 and the second metal layer 22 are integrated is prepared as the first metal layer 21 and the second metal layer 22, the insulating portion 35 is formed by removing a portion that becomes the boundary between the first metal layer 21 and the second metal layer 22 in the metal layer. Further, since a part of the metal layer is removed to form the insulating portion 35, in a plan view, the first metal layer 21 and the second metal layer 22 are arranged so as not to overlap and be separated. The removal of a part of the metal layer is performed, for example, by laser irradiation.

[0202] In the case of manufacturing the laminate film 2A, for example, an insulating portion 36 is formed by filling the formed insulating portion 35 with an insulating material.

[0203] Next, the first resin film 11, the first metal layer 21, the second metal layer 22, and the second resin film 12 are laminated (step S23). Specifically, the second resin film 12 is opposed to the first resin film 11, and the first metal layer 21 and the second metal layer 22 are located between the first resin film 11 and the second resin film 12, and the first resin film 11, the first metal layer 21, the second metal layer 22, and the second resin film 12 are laminated. Further, in step S23, in a plan view, the first resin film 11, the first metal layer 21, the second metal layer 22, and the second resin film 12 are laminated so that a first region 41 and a second region 42 are formed.

[0204] Next, the first resin film 11, the first metal layer 21, the second metal layer 22, and the second resin film 12 are integrated (step S24). The integration in step S24 is performed, for example, by heat fusion or adhesion using an adhesive. When heat fusion is performed, for example, the first resin film 11, the first metal layer 21, the second metal layer 22, and the second resin film 12 are hot-pressed from both sides in the lamination direction. Note that, similar to the method for manufacturing the laminate film according to Embodiment 1 and each modification of Embodiment 1, at least one of step S21, step S22, step S23, and step S24 may be performed separately. Also, the order of step S21, step S22, step S23, and step S24 is not limited to the above example. In the case of manufacturing the laminate film 2B, an auxiliary layer 50 that covers the insulating portion 35 is formed via the first resin film 11 by heat fusion, adhesion, or the like.

[0205] (Embodiment 3) Next, Embodiment 3 will be described. Specifically, in Embodiment 3, a battery including a battery exterior body composed of one or more laminate films including the laminate film according to any one of the above Embodiment 1, each modification of Embodiment 1, Embodiment 2, and each modification of Embodiment 2 as a first laminate film will be described.

[0206] FIG. 21 is a top view of a battery 100 according to the present embodiment. FIG. 22 is a cross-sectional view of the battery 100 according to the present embodiment. Specifically, FIG. 21 is a plan view of the battery 100 when viewed from the positive side in the z-axis direction. Further, in FIG. 21, in the region overlapping the first film portion 71, the outlines of the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 are shown by broken lines. Further, FIG. 22 represents a cross-section taken along line XXII-XXII shown in FIG. 21.

[0207] As shown in FIGS. 21 and 22, the battery 100 includes a power generation element 200, a battery exterior body 70, an electrode terminal 310, and a counter electrode terminal 320.

[0208] First, the details of the configurations of the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 will be described. FIG. 23 is a cross-sectional view of the power generation element 200 according to the present embodiment. In FIG. 23, the electrode terminal 310 and the counter electrode terminal 320 are also shown together with the power generation element 200.

[0209] As shown in FIG. 23, the power generation element 200 is composed of one battery cell 150. The power generation element 200 is, for example, an all-solid-state battery. Note that the power generation element 200 may be composed of a plurality of battery cells 150. In this case, the plurality of battery cells 150 are stacked and electrically connected in series or in parallel. Further, the plurality of battery cells 150 may be connected in a combination of series connection and parallel connection.

[0210] The planar shape of the power generation element 200 is rectangular, for example, as shown in FIG. 21. That is, the shape of the power generation element 200 is a flat rectangular parallelepiped. Here, "flat" means that the thickness (i.e., the length in the z-axis direction) is shorter than each side of the main surface (i.e., the length in each of the x-axis direction and the y-axis direction) or the maximum width. The planar shape of the power generation element 200 may be other polygons such as a square, a hexagon, or an octagon, or may be a circle or an ellipse, etc.

[0211] The battery cell 150 is, for example, a battery with the minimum configuration and is also referred to as a unit cell. The battery cell 150 includes an electrode layer 110, a counter electrode layer 120, and a solid electrolyte layer 130. The electrode layer 110 and the counter electrode layer 120 are arranged to face each other. The electrode layer 110 has an electrode current collector 111 and an electrode active material layer 112. The counter electrode layer 120 has a counter electrode current collector 121 and a counter electrode active material layer 122. The solid electrolyte layer 130 is located between the electrode layer 110 and the counter electrode layer 120. In the battery cell 150, the electrode current collector 111, the electrode active material layer 112, the solid electrolyte layer 130, the counter electrode active material layer 122, and the counter electrode current collector 121 are laminated in this order along the z-axis.

[0212] Note that the electrode layer 110 is one of the positive electrode layer and the negative electrode layer of the battery cell 150. The counter electrode layer 120 is the other of the positive electrode layer and the negative electrode layer of the battery cell 150. Hereinafter, the case where the electrode layer 110 is the negative electrode layer and the counter electrode layer 120 is the positive electrode layer will be described as an example.

[0213] The electrode current collector 111 and the counter electrode current collector 121 are each a foil-shaped, plate-shaped, or mesh-shaped member having conductivity. The electrode current collector 111 and the counter electrode current collector 121 may each be, for example, a thin film having conductivity. As the material constituting the electrode current collector 111 and the counter electrode current collector 121, for example, metals such as stainless steel (SUS), aluminum (Al), copper (Cu), and nickel (Ni) can be used. The electrode current collector 111 and the counter electrode current collector 121 may be formed using different materials.

[0214] The thickness of each of the electrode current collector 111 and the counter electrode current collector 121 is, for example, 5 μm or more and 100 μm or less, but is not limited thereto. The electrode active material layer 112 is in contact with the main surface of the electrode current collector 111. Note that the electrode current collector 111 may include a current collector layer which is a layer containing a conductive material provided at a portion in contact with the electrode active material layer 112. The counter electrode active material layer 122 is in contact with the main surface of the counter electrode current collector 121. Note that the counter electrode current collector 121 may include a current collector layer which is a layer containing a conductive material provided at a portion in contact with the counter electrode active material layer 122.

[0215] The electrode active material layer 112 and the counter electrode active material layer 122 face each other with the solid electrolyte layer 130 interposed therebetween.

[0216] The electrode active material layer 112 is disposed on the main surface of the electrode current collector 111 on the side of the counter electrode layer 120. The electrode active material layer 112 contains, for example, a negative electrode active material as an electrode material. The electrode active material layer 112 is disposed to face the counter electrode active material layer 122.

[0217] As the negative electrode active material contained in the electrode active material layer 112, for example, negative electrode active materials such as graphite and metallic lithium can be used. As the material of the negative electrode active material, various materials capable of releasing and inserting ions such as lithium (Li) or magnesium (Mg) can be used.

[0218] In addition, as the material contained in the electrode active material layer 112, for example, a solid electrolyte such as an inorganic solid electrolyte may be used. As the inorganic solid electrolyte, for example, a sulfide solid electrolyte or an oxide solid electrolyte can be used. As the sulfide solid electrolyte, for example, a mixture of lithium sulfide (Li2S) and phosphorus pentasulfide (P2S5) can be used. In addition, as the material contained in the electrode active material layer 112, for example, a conductive agent such as acetylene black or a binder for binding such as polyvinylidene fluoride may be used.

[0219] A paste-like paint obtained by kneading the contained material of the electrode active material layer 112 together with a solvent is applied onto the main surface of the electrode current collector 111 and dried, whereby the electrode active material layer 112 is produced. In order to increase the density of the electrode active material layer 112, after drying, the electrode layer 110 (also referred to as an electrode plate) including the electrode active material layer 112 and the electrode current collector 111 may be pressed. The thickness of the electrode active material layer 112 is, for example, 5 μm or more and 300 μm or less, but is not limited thereto.

[0220] The counter electrode active material layer 122 is disposed on the main surface of the counter electrode current collector 121 on the side of the electrode layer 110. The counter electrode active material layer 122 is, for example, a layer containing a positive electrode material such as an active material. The positive electrode material is a material that constitutes the counter electrode of the negative electrode material. The counter electrode active material layer 122 contains, for example, a positive electrode active material.

[0221] Examples of the positive electrode active material contained in the counter electrode active material layer 122 include positive electrode active materials such as lithium cobalt composite oxide (LCO), lithium nickel composite oxide (LNO), lithium manganese composite oxide (LMO), lithium-manganese-nickel composite oxide (LMNO), lithium-manganese-cobalt composite oxide (LMCO), lithium-nickel-cobalt composite oxide (LNCO), and lithium-nickel-manganese-cobalt composite oxide (LNMCO). As materials for the positive electrode active material, various materials capable of releasing and inserting ions such as Li or Mg can be used.

[0222] In addition, as the contained material of the counter electrode active material layer 122, a solid electrolyte such as an inorganic solid electrolyte may be used. As the inorganic solid electrolyte, a sulfide solid electrolyte or an oxide solid electrolyte may be used. As the sulfide solid electrolyte, for example, a mixture of Li2S and P2S5 may be used. The surface of the positive electrode active material may be coated with a solid electrolyte. Further, as the contained material of the counter electrode active material layer 122, a conductive agent such as acetylene black or a binder for binding such as polyvinylidene fluoride may be used.

[0223] A paste-like paint in which the material contained in the counter electrode active material layer 122 is kneaded together with a solvent is applied onto the main surface of the counter electrode current collector 121 and dried, whereby the counter electrode active material layer 122 is produced. In order to increase the density of the counter electrode active material layer 122, after drying, the counter electrode layer 120 (also referred to as a counter electrode plate) including the counter electrode active material layer 122 and the counter electrode current collector 121 may be pressed. The thickness of the counter electrode active material layer 122 is, for example, 5 μm or more and 300 μm or less, but is not limited thereto.

[0224] The solid electrolyte layer 130 is disposed between the electrode active material layer 112 and the counter electrode active material layer 122. The solid electrolyte layer 130 is in contact with each of the electrode active material layer 112 and the counter electrode active material layer 122. The solid electrolyte layer 130 is a layer containing an electrolyte material. As the electrolyte material, generally known electrolytes for batteries can be used. The thickness of the solid electrolyte layer 130 may be 5 μm or more and 300 μm or less, or may be 5 μm or more and 100 μm or less.

[0225] The solid electrolyte layer 130 contains a solid electrolyte. As the solid electrolyte, for example, solid electrolytes such as inorganic solid electrolytes can be used. As the inorganic solid electrolyte, sulfide solid electrolytes or oxide solid electrolytes can be used. As the sulfide solid electrolyte, for example, a mixture of Li2S and P2S5 can be used. Note that the solid electrolyte layer 130 may contain, in addition to the electrolyte material, a binder for binding such as polyvinylidene fluoride.

[0226] In the present embodiment, the electrode active material layer 112, the counter electrode active material layer 122, and the solid electrolyte layer 130 are maintained in a parallel plate shape. Thereby, the occurrence of cracks or collapses due to bending can be suppressed. Note that the electrode active material layer 112, the counter electrode active material layer 122, and the solid electrolyte layer 130 may be smoothly curved together.

[0227] As shown in FIGS. 21 to 23, the electrode terminal 310 is an electrode lead that is electrically connected to the electrode layer 110 and drawn out to the outside of the power generation element 200 in a plan view. A part of the electrode terminal 310 is disposed inside the battery exterior body 70. The electrode terminal 310 is drawn out from the negative end of the battery exterior body 70 in the x-axis direction, and a part of the electrode terminal 310 is exposed. The electrode terminal 310 is connected to the electrode current collector 111, for example, on the main surface 210 of the power generation element 200. The main surface 210 is the upper surface of the power generation element 200. Note that the electrode terminal 310 may be connected to the end surface of the electrode current collector 111 or may be integral with the electrode current collector 111. For example, the electrode current collector 111 may have a portion that functions as a current collector and a portion that functions as a lead.

[0228] The counter electrode terminal 320 is a counter electrode lead that is electrically connected to the counter electrode layer 120 and drawn out to the outside of the power generation element 200 in a plan view. A part of the counter electrode terminal 320 is disposed inside the battery exterior body 70. The counter electrode terminal 320 is drawn out from the positive end of the battery exterior body 70 in the x-axis direction, and a part of the counter electrode terminal 320 is exposed. Therefore, the electrode terminal 310 and the counter electrode terminal 320 are drawn out in opposite directions to each other. The counter electrode terminal 320 is connected to the counter electrode current collector 121, for example, on the main surface 220 of the power generation element 200. The main surface 220 is the lower surface of the power generation element 200 and faces away from the main surface 210. Note that the counter electrode terminal 320 may be connected to the end surface of the counter electrode current collector 121 or may be integral with the counter electrode current collector 121. For example, the counter electrode current collector 121 may have a portion that functions as a current collector and a portion that functions as a lead.

[0229] The electrode terminal 310 and the counter electrode terminal 320 are each composed of a film-like or foil-like conductor such as metal.

[0230] Next, with reference to FIGS. 21 and 22, the details of the battery exterior body 70 will be described.

[0231] The battery exterior body 70 seals the power generation element 200 so as to expose a part of the electrode terminal 310 and a part of the counter electrode terminal 320. The battery exterior body 70 is an example of one or more laminate films and is composed of one of the above laminate films 1A. The battery exterior body 70 includes a first film portion 71 and a second film portion 72. The first film portion 71 and the second film portion 72 face each other so as to sandwich the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 from above and below. The first film portion 71 is a portion that covers the power generation element 200 from above, and the second film portion 72 is a portion that covers the power generation element 200 from below. Also, the first film portion 71 is a part of the laminate film 1A, and the second film portion 72 is the remaining part of the laminate film 1A.

[0232] In the battery exterior body 70, one laminate film 1A is bent and used. Specifically, the laminate film 1A is folded back in the y-axis direction so that each of the first region 41, the second region 42, and the third region 43 is bent. The power generation element 200 is sandwiched between the bent laminate films 1A. In the battery exterior body 70, the first film portion 71 is a portion that covers the power generation element 200 from above when the laminate film 1A is folded back at the folding position 75, and the second film portion 72 is a portion that covers the power generation element 200 from below when the laminate film 1A is folded back at the folding position 75. The folding position 75 forms one side of the contour of the battery exterior body 70 in plan view. Each of the first film portion 71 and the second film portion 72 has the first region 41, the second region 42, and the third region 43. In the examples shown in FIGS. 21 and 22, in plan view, the positions of the first region 41, the second region 42, and the third region 43 in the first film portion 71 and the second film portion 72 are the same.

[0233] In each of the first film portion 71 and the second film portion 72, in a plan view, one of the first region 41 and the second region 42 overlaps with the electrode terminal 310 and does not overlap with the counter electrode terminal 320, and the other of the first region 41 and the second region 42 overlaps with the counter electrode terminal 320 and does not overlap with the electrode terminal 310. In the examples shown in FIGS. 21 and 22, in the first film portion 71 and the second film portion 72, in a plan view, the first region 41 overlaps with the electrode terminal 310 and does not overlap with the counter electrode terminal 320, and the second region 42 overlaps with the counter electrode terminal 320 and does not overlap with the electrode terminal 310.

[0234] Also, in the first film portion 71 and the second film portion 72, in a plan view, the third region 43 overlaps with at least a part of the power generation element 200. In the first film portion 71 and the second film portion 72, in a plan view, the third region 43 may overlap with the entire power generation element 200.

[0235] Also, in the example shown in FIG. 22, in the first film portion 71 and the second film portion 72, the lamination order of the first resin film 11, the first metal layer 21, the insulating layer 30, the second metal layer 22, and the second resin film 12 is reversed in the vertical direction. Also, in each of the first film portion 71 and the second film portion 72, the first metal layer 21 is closer to the power generation element 200 than the second metal layer 22. Also, in each of the first film portion 71 and the second film portion 72, the first resin film 11 is closer to the power generation element 200 than the second resin film 12 and is in contact with the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320. Note that in each of the first film portion 71 and the second film portion 72, the second resin film 12 may be arranged closer to the power generation element 200 than the first resin film 11.

[0236] The battery exterior body 70 seals the power generation element 200 such that a part of the electrode terminal 310 and a part of the counter electrode terminal 320 are exposed by adhering the first film portion 71 and the second film portion 72 and adhering the first film portion 71 and the second film portion 72 to the electrode terminal 310 and the counter electrode terminal 320. In the example shown in FIG. 21, in a plan view, a heat sealing process is performed on an end portion of the battery exterior body 70 other than the folding position 75, and the power generation element 200 is sealed in the battery exterior body 70. By the heat sealing process, the first resin film 11 and the second resin film 12 are melted and heat-sealed to the contacting portions. In the battery 100, since the power generation element 200 is sandwiched and sealed between one folded laminate film 1A, the power generation element 200 can be sealed without heat-sealing the laminate film 1A at the folding position 75. Therefore, it is not necessary to secure a region for heat-sealing in the vicinity of the folding position 75, and the projected area of the battery 100 can be reduced. Further, since the number of locations where the heat sealing process is performed is reduced, a short circuit between the electrode layer 110 and the counter electrode layer 120 via the battery exterior body 70 due to the heat sealing process can be suppressed. Note that the shape of the battery exterior body 70 and the position of the heat sealing process are not particularly limited as long as the power generation element 200 can be sealed.

[0237] Each of the first film portion 71 and the second film portion 72 adheres to the electrode terminal 310 in one of the first region 41 and the second region 42 and adheres to the counter electrode terminal 320 in the other of the first region 41 and the second region 42. In the examples shown in FIGS. 21 and 22, each of the first film portion 71 and the second film portion 72 adheres to the electrode terminal 310 in the first region 41 and adheres to the counter electrode terminal 320 in the second region 42. Also, each of the first film portion 71 and the second film portion 72 does not adhere to the electrode terminal 310 in a region other than the first region 41 and does not adhere to the counter electrode terminal 320 in a region other than the second region 42. Specifically, the battery exterior body 70 has adhesive seal portions 91, 92, and 93 as heat-sealing portions for sealing the power generation element 200. In the battery exterior body 70, for example, the heat sealing process is not performed in portions other than the adhesive seal portions 91, 92, and 93.

[0238] Next, the sealing portion 91 is a portion of the battery exterior body 70 where the first film portion 71 and the second film portion 72 sandwich the electrode terminal 310 and adhere to the electrode terminal 310. Also, in the example shown in FIG. 21, the adhesive sealing portion 91 is a portion of the end of the battery exterior body 70 that overlaps the electrode terminal 310 in a plan view. The electrode terminal 310 is sandwiched between the first film portion 71 and the second film portion 72 on the side of the power generation element 200 rather than the portion where it is exposed, and is adhered to the respective ends of the first film portion 71 and the second film portion 72. The electrode terminal 310 is directly adhered to the first film portion 71 and the second film portion 72. Thereby, since a molten sleeve or the like is not disposed between the electrode terminal 310 and the first film portion 71 and between the electrode terminal 310 and the second film portion 72, intrusion of moisture into the battery exterior body 70 can be suppressed. In the battery exterior body 70, the adhesive sealing portion 91 and the adhesive sealing portion 92 face each other with the power generation element 200 interposed therebetween. Also, the adhesive sealing portion 91 is located in the first region 41 of the first film portion 71 and the second film portion 72.

[0239] The adhesive sealing portion 92 is a portion of the battery exterior body 70 where the first film portion 71 and the second film portion 72 sandwich the counter electrode terminal 320 and adhere to the counter electrode terminal 320. In the example shown in FIG. 21, the adhesive sealing portion 92 is a portion of the end of the battery exterior body 70 that overlaps the counter electrode terminal 320 in a plan view. The counter electrode terminal 320 is sandwiched between the first film portion 71 and the second film portion 72 on the side of the power generation element 200 rather than the portion where it is exposed, and is adhered to the respective ends of the first film portion 71 and the second film portion 72. The counter electrode terminal 320 is directly adhered to the first film portion 71 and the second film portion 72. Thereby, since a molten sleeve or the like is not disposed between the counter electrode terminal 320 and the first film portion 71 and between the counter electrode terminal 320 and the second film portion 72, intrusion of moisture into the battery exterior body 70 can be suppressed. Also, the adhesive sealing portion 92 is located in the second region 42 of the first film portion 71 and the second film portion 72.

[0240] Next, the sealing portion 93 is a portion where the first film portion 71 and the second film portion 72 are adhered to each other in the battery exterior body 70. In the example shown in FIG. 21, the adhesive sealing portion 93 is a portion that does not overlap the electrode terminal 310 and the counter electrode terminal 320 among the end portions other than the folding position 75 in the battery exterior body 70 in a plan view.

[0241] As described above, in the laminate film 1A, since the first metal layer 21 and the second metal layer 22 are electrically insulated from each other, even when the first metal layer 21 contacts the electrode terminal 310 and the second metal layer 22 contacts the counter electrode terminal 320 during the heat sealing process of the laminate film 1A, short - circuiting between the electrode terminal 310 and the counter electrode terminal 320 is suppressed. Therefore, a highly reliable battery 100 can be realized.

[0242] Note that the battery exterior body 70 may be composed of two laminate films 1A. In this case, the first film portion 71 and the second film portion 72 are each composed of one laminate film 1A. Also, in a plan view, the direction in which the first region 41, the third region 43, and the second region 42 are arranged may be the same or opposite between the first film portion 71 and the second film portion 72, each composed of one laminate film 1A. When the direction is opposite, for example, the adhesive sealing portion 91 is located in the first region 41 in the first film portion 71 and in the second region 42 in the second film portion 72, and the adhesive sealing portion 92 is located in the second region 42 in the first film portion 71 and in the first region 41 in the second film portion 72. Also, between the first film portion 71 and the second film portion 72, each composed of one laminate film 1A, the stacking order of the first resin film 11, the first metal layer 21, the insulating layer 30, the second metal layer 22, and the second resin film 12 may be the same in the vertical direction or may be reversed. Also, laminate films having different laminate configurations may be used for the first film portion 71 and the second film portion 72. For example, for the second film portion 72, a known laminate film such as a three-layer laminate film in which only one metal layer is disposed throughout the space between the first resin film 11 and the second resin film 12 may be used. Also, for the second film portion 72, a laminate film according to any one of Embodiment 1 other than the laminate film 1A, each modification of Embodiment 1, Embodiment 2, and each modification of Embodiment 2 may be used.

[0243] Also, as shown in FIG. 22, in the battery 100, for example, a gap 290 exists between the side surface of the power generation element 200 and the battery exterior body 70. The gap 290 can provide a shock mitigation effect against external stress. The gap 290 may be depressurized compared to the outside of the battery exterior body 70. Also, the gap 290 may be filled with an insulating material. By filling the gap 290 with an insulating material, the insulation performance of the side surface of the power generation element 200 can be enhanced. Note that in the battery 100, the gap 290 may not exist and the battery exterior body 70 may be in contact with the side surface of the power generation element 200.

[0244] Note that the battery exterior 70 of the battery 100 according to the present embodiment may be composed of a laminate film according to any one of Embodiment 1 other than the laminate film 1A, each modification of Embodiment 1, Embodiment 2, and each modification of Embodiment 2. Hereinafter, as an example, a battery including a battery exterior composed of the above laminate film 1F will be described.

[0245] FIG. 24 is a top view of another battery 100A according to the present embodiment. FIG. 25 is a cross-sectional view of another battery 100A according to the present embodiment. Specifically, FIG. 24 is a plan view of the battery 100A when viewed from the positive side in the z-axis direction. In FIG. 24, in the region overlapping the first film portion 71A, the outlines of the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 are indicated by broken lines. Further, FIG. 25 shows a cross-section taken along the line XXV-XXV shown in FIG. 24.

[0246] The battery 100A has a configuration in which the battery exterior 70 of the battery 100 is replaced with a battery exterior 70A. In the following description, the battery 100A will be described centering on the differences from the battery 100, and the description of the common points will be omitted or simplified.

[0247] The battery exterior 70A seals the power generation element 200. The battery exterior 70A is an example of one or more laminate films and is composed of one of the above laminate films 1F. The battery exterior 70A includes a first film portion 71A and a second film portion 72A. The first film portion 71A and the second film portion 72A face each other so as to sandwich the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 from above and below. Further, the first film portion 71A is a part of the laminate film 1F, and the second film portion 72A is the remaining part of the laminate film 1F.

[0248] In the battery exterior body 70A, one laminate film 1F is bent and used. Specifically, the laminate film 1F is folded back and bent in the y-axis direction so that the first region 41, the second region 42, the third region 43a, the fourth region 44, and the fifth region 45 are each bent. Each of the first film portion 71A and the second film portion 72A has the first region 41, the second region 42, the third region 43a, the fourth region 44, and the fifth region 45. In the examples shown in FIGS. 24 and 25, in plan view, the positions of the first region 41, the second region 42, the third region 43a, the fourth region 44, and the fifth region 45 in the first film portion 71A and the second film portion 72A are the same.

[0249] In the examples shown in FIGS. 24 and 25, in the first film portion 71A and the second film portion 72A, in plan view, the first region 41 overlaps with the electrode terminal 310 and does not overlap with the counter electrode terminal 320, and the second region 42 overlaps with the counter electrode terminal 320 and does not overlap with the electrode terminal 310.

[0250] Also, in the first film portion 71A and the second film portion 72A, in plan view, the third region 43a overlaps with at least a part of the power generation element 200. In the examples shown in FIGS. 24 and 25, in the first film portion 71A and the second film portion 72A, in plan view, the third region 43a overlaps with the entire power generation element 200. Note that in the first film portion 71A and the second film portion 72A, in plan view, at least a part of the fourth region 44 and the fifth region 45 may overlap with the power generation element 200, and further, a part of the first region 41 and the second region 42 may overlap with the power generation element 200.

[0251] Also, in the example shown in FIG. 25, in each of the first film portion 71A and the second film portion 72A, the first metal layer 21 and the second metal layer 22 are closer to the power generation element 200 than the third metal layer 23. In at least one of the first film portion 71A and the second film portion 72A, the first metal layer 21 and the second metal layer 22 may be farther from the power generation element 200 than the third metal layer 23. Also, the third metal layer 23 overlaps the entire power generation element 200 in a plan view.

[0252] The battery exterior body 70A seals the power generation element 200 such that the first film portion 71A and the second film portion 72A are adhered to each other, and the first film portion 71A and the second film portion 72A are adhered to the electrode terminal 310 and the counter electrode terminal 320, so that a part of the electrode terminal 310 and a part of the counter electrode terminal 320 are exposed. In the examples shown in FIGS. 24 and 25, each of the first film portion 71A and the second film portion 72A is adhered to the electrode terminal 310 in the first region 41 and adhered to the counter electrode terminal 320 in the second region 42.

[0253] As described above, also in the laminate film 1F, since the first metal layer 21 and the second metal layer 22 are electrically insulated from each other, even when the first metal layer 21 comes into contact with the electrode terminal 310 and the second metal layer 22 comes into contact with the counter electrode terminal 320 during the heat sealing process of the laminate film 1F, the short circuit between the electrode terminal 310 and the counter electrode terminal 320 is suppressed. Therefore, a highly reliable battery 100A can be realized.

[0254] Note that, as shown in FIG. 25, in the battery 100A, there is no such gap 290 between the side surface of the power generation element 200 and the battery exterior body 70A, but the gap 290 may exist.

[0255] [Modification Example 1] Hereinafter, Modification Example 1 of Embodiment 3 will be described. In the description of Modification Example 1 below, the description will focus on the differences from the above-described Embodiments 1, 2, and 3, and each modification example of Embodiments 1 and 2, and the description of the common points will be omitted or simplified. The same applies to Modification Examples 2 and later described below. In the description of each modification example, the description will focus on the differences from the above-described Embodiments 1, 2, and 3, and each modification example of Embodiments 1, 2, and 3, and the description of the common points will be omitted or simplified.

[0256] FIG. 26 is a top view of the battery 100B according to this modification example. FIG. 27 is a cross-sectional view of the battery 100B according to this modification example. Specifically, FIG. 26 is a plan view of the battery 100B when viewed from the positive side in the z-axis direction. In FIG. 26, in the region overlapping with the first film portion 71B, the outlines of the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 are shown by broken lines. Further, FIG. 27 shows a cross-section taken along line XXVII-XXVII shown in FIG. 26.

[0257] As shown in FIGS. 26 and 27, the battery 100B according to this modification example mainly differs from the battery 100 according to Embodiment 3 in that it includes a battery exterior body 70B instead of the battery exterior body 70, and the electrode layer 110 and the counter electrode layer 120 are electrically connected to the individual first metal layers 21, respectively.

[0258] The battery exterior body 70B seals the power generation element 200. The battery exterior body 70B is an example of one or more laminate films and is composed of two of the above-described laminate films 2. The battery exterior body 70B includes a first film portion 71B and a second film portion 72B. The first film portion 71B and the second film portion 72B face each other so as to sandwich the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 from above and below. Further, each of the first film portion 71B and the second film portion 72B is composed of, for example, one laminate film 2 having the same size as each other in plan view.

[0259] In the battery exterior body 70B, two laminate films 2 are used so as to overlap in a plan view. The power generation element 200 is sandwiched between the two laminate films 2. Each of the first film portion 71B and the second film portion 72B has a first region 41 and a second region 42. In the example shown in FIG. 27, in a plan view, the positional relationship between the first region 41 and the second region 42 in the first film portion 71B and the second film portion 72B is reversed in the x-axis direction.

[0260] In the examples shown in FIGS. 26 and 27, in the first film portion 71B, in a plan view, the first region 41 overlaps with the electrode terminal 310 and does not overlap with the counter electrode terminal 320, and the second region 42 overlaps with the counter electrode terminal 320 and does not overlap with the electrode terminal 310. On the other hand, in the second film portion 72B, in a plan view, the first region 41 overlaps with the counter electrode terminal 320 and does not overlap with the electrode terminal 310, and the second region 42 overlaps with the electrode terminal 310 and does not overlap with the counter electrode terminal 320.

[0261] Also, in the first film portion 71B and the second film portion 72B, in a plan view, the insulating portion 35 may or may not overlap with the power generation element 200.

[0262] The battery exterior body 70B is formed by adhering the first film portion 71B and the second film portion 72B, and by adhering the first film portion 71B and the second film portion 72B to the electrode terminal 310 and the counter electrode terminal 320, the power generation element 200 is sealed such that a part of the electrode terminal 310 and a part of the counter electrode terminal 320 are exposed. In the example shown in FIG. 26, in a plan view, a heat sealing process is performed on the entire outer peripheral portion of the battery exterior body 70B, and the power generation element 200 is sealed in the battery exterior body 70B. In the examples shown in FIGS. 26 and 27, the first film portion 71B is adhered to the electrode terminal 310 in the first region 41 and adhered to the counter electrode terminal 320 in the second region 42. On the other hand, the second film portion 72B is adhered to the electrode terminal 310 in the second region 42 and adhered to the counter electrode terminal 320 in the first region 41. Further, the first film portion 71B is not adhered to the electrode terminal 310 in a region other than the first region 41, and is not adhered to the counter electrode terminal 320 in a region other than the second region 42. On the other hand, the second film portion 72B is not adhered to the electrode terminal 310 in a region other than the second region 42, and is not adhered to the counter electrode terminal 320 in a region other than the first region 41.

[0263] The adhesion and sealing portion 91 is located in the first region 41 of the first film portion 71B and the second region 42 of the second film portion 72B. The adhesion and sealing portion 92 is located in the second region 42 of the first film portion 71B and the first region 41 of the second film portion 72B.

[0264] The adhesion and sealing portion 93 is, in a plan view, a portion of the end of the battery exterior body 70B that does not overlap the electrode terminal 310 and the counter electrode terminal 320.

[0265] In the battery 100B, the electrode terminal 310 is in contact with the first metal layer 21 of the first film portion 71B in the adhesive sealing portion 91. Therefore, the electrode layer 110 is electrically connected to the first metal layer 21 of the first film portion 71B via the electrode terminal 310. As a result, the heat of the electrode layer 110 and the portions electrically connected to the electrode layer 110 such as the electrode terminal 310 can be released to the first metal layer 21, enhancing the heat dissipation performance of the battery 100B and improving the reliability of the battery 100B. Also, in the example shown in FIG. 27, since the first metal layer 21 is larger than the second metal layer 22, the above-mentioned heat can be released to the first metal layer 21 more efficiently. Further, the electrode layer 110 is not electrically connected to the second metal layer 22 of the first film portion 71B.

[0266] For example, by increasing the pressure when performing thermocompression bonding for the heat sealing process, the first resin film 11 between the first metal layer 21 and the electrode terminal 310 is extruded, and the first metal layer 21 is deformed, so that the electrode terminal 310 and the first metal layer 21 come into contact. The contact form between the electrode terminal 310 and the first metal layer 21 is not particularly limited. The first metal layer 21 may be bent, may be deformed so as to be crushed, or a part of the first metal layer 21 may be torn. Also, the electrode terminal 310 may be deformed. In the example shown in FIG. 27, the electrode terminal 310 is not in contact with the second metal layer 22 of the second film portion 72B in the adhesive sealing portion 91, but it may be in contact. Also, when the second region 42 in the first film portion 71B is disposed on the electrode terminal 310 side, the electrode terminal 310 may be in contact with the second metal layer 22 of the first film portion 71B instead of the first metal layer 21 of the first film portion 71B. That is, the electrode layer 110 may be electrically connected to the second metal layer 22 of the first film portion 71B and may not be electrically connected to the first metal layer 21 of the first film portion 71B.

[0267] Also, in battery 100B, the counter electrode terminal 320 is in contact with the first metal layer 21 of the second film portion 72B at the adhesive sealing portion 92. Therefore, the counter electrode layer 120 is electrically connected to the first metal layer 21 of the second film portion 72B via the counter electrode terminal 320. As a result, the heat of the counter electrode layer 120 and the portions electrically connected to the counter electrode layer 120 such as the counter electrode terminal 320 can be dissipated to the first metal layer 21, improving the heat dissipation performance of battery 100B and enhancing the reliability of battery 100B. Also, the counter electrode layer 120 is not electrically connected to the second metal layer 22 of the second film portion 72B. Further, since the first metal layer 21 of the first film portion 71B and the first metal layer 21 of the second film portion 72B are not electrically connected, the electrode terminal 310 and the counter electrode terminal 320 are not electrically connected via the battery exterior body 70B, and no short circuit occurs between the electrode layer 110 and the counter electrode layer 120 via the battery exterior body 70B.

[0268] The method of bringing the counter electrode terminal 320 into contact with the first metal layer 21 and the contact form between the counter electrode terminal 320 and the first metal layer 21 are, for example, the same as those in the case of the contact between the electrode terminal 310 and the first metal layer 21 described above. In the example shown in FIG. 27, the counter electrode terminal 320 is not in contact with the second metal layer 22 of the first film portion 71B at the adhesive sealing portion 92, but it may be in contact. Also, when the second region 42 is disposed on the counter electrode terminal 320 side in the second film portion 72B, the second metal layer 22 of the second film portion 72B may be in contact with the counter electrode terminal 320 instead of the first metal layer 21 of the second film portion 72B. That is, the counter electrode layer 120 may be electrically connected to the second metal layer 22 of the second film portion 72B and may not be electrically connected to the first metal layer 21 of the second film portion 72B.

[0269] Note that either the contact between the first metal layer 21 of the first film portion 71B and the electrode terminal 310 or the contact between the first metal layer 21 of the second film portion 72B and the counter electrode terminal 320 may not occur.

[0270] As described above, in the laminate film 2, since the first metal layer 21 and the second metal layer 22 are electrically insulated from each other, even if contact occurs between the first metal layer 21 of the first film portion 71B and the electrode terminal 310 and between the first metal layer 21 of the second film portion 72B and the counter electrode terminal 320, short - circuiting between the electrode terminal 310 and the counter electrode terminal 320 is suppressed. Therefore, a highly reliable battery 100B can be realized.

[0271] Note that the battery exterior body 70B may be composed of a single laminate film 2. In this case, as described for the battery 100, the single laminate film 2 is used after being bent.

[0272] Also, the battery exterior body 70B of the battery 100B according to this modification example may be composed of a laminate film according to any one of Embodiment 1, each modification example of Embodiment 1, Embodiment 2, and each modification example of Embodiment 2 other than the laminate film 2. Hereinafter, as an example, a battery including a battery exterior body composed of the above - mentioned laminate film 2A or 2B will be described.

[0273] FIG. 28 is a top view of another battery 100C according to this modification example. FIG. 29 is a cross - sectional view of another battery 100C according to this modification example. Specifically, FIG. 28 is a plan view of the battery 100C when viewed from the positive side in the z - axis direction. Also, in FIG. 28, in the region overlapping the first film portion 71C, the outlines of the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 are shown by broken lines. Further, FIG. 29 represents a cross - section taken along line XXIX - XXIX shown in FIG. 28. FIG. 30 is a top view of yet another battery 100D according to this modification example. FIG. 31 is a cross - sectional view of yet another battery 100D according to this modification example. Specifically, FIG. 30 is a plan view of the battery 100D when viewed from the positive side in the z - axis direction. Also, in FIG. 30, in the region overlapping the first film portion 71D, the outlines of the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 are shown by broken lines. Further, FIG. 31 represents a cross - section taken along line XXXI - XXXI shown in FIG. 30.

[0274] Battery 100C has a configuration in which the battery exterior case 70B of battery 100B is replaced with a battery exterior case 70C. Also, battery 100D has a configuration in which the battery exterior case 70B of battery 100B is replaced with a battery exterior case 70D. In the following description, batteries 100C and 100D will be described centering on the differences from battery 100B, and the description of the common points will be omitted or simplified.

[0275] As shown in FIGS. 28 and 29, the battery exterior case 70C is an example of one or more laminate films and is composed of two of the above laminate films 2A. The battery exterior case 70C includes a first film portion 71C and a second film portion 72C. The first film portion 71C and the second film portion 72C face each other so as to sandwich the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 from above and below. Each of the first film portion 71C and the second film portion 72C is composed of one laminate film 2A of the same size as each other. In the battery exterior case 70C, since a laminate film 2A provided with an insulating portion 36 made of an insulating material is used, the gas barrier property of the battery exterior case 70C is enhanced, and the reliability of the battery 100C can be enhanced.

[0276] As shown in FIGS. 30 and 31, the battery exterior case 70D is an example of one or more laminate films and is composed of two of the above laminate films 2B. The battery exterior case 70D includes a first film portion 71D and a second film portion 72D. The first film portion 71D and the second film portion 72D face each other so as to sandwich the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 from above and below. Each of the first film portion 71D and the second film portion 72D is composed of one laminate film 2B of the same size as each other. In the battery exterior case 70D, since a laminate film 2B provided with an auxiliary layer 50 covering the insulating portion 35 is used, the gas barrier property of the battery exterior case 70D is enhanced, and the reliability of the battery 100D can be enhanced.

[0277] In the first film portion 71D and the second film portion 72D, in a plan view, the auxiliary layer 50 overlaps at least a part of the power generation element 200. In the examples shown in FIGS. 30 and 31, in the first film portion 71D and the second film portion 72D, in a plan view, the auxiliary layer 50 overlaps the entire power generation element 200. Further, the auxiliary layer 50 is disposed on the side farther from the power generation element 200 in the first film portion 71D and the second film portion 72D. The auxiliary layer 50 faces the main surface 210 or 220 of the power generation element 200 with the first resin film 11 and the second resin film 12 interposed therebetween.

[0278] In the battery 100D, for example, the battery exterior body 70D is formed by sealing the power generation element 200 using the laminated film 2B in which the auxiliary layer 50 is previously formed. Note that in the battery 100D, the power generation element 200 may be sealed using the laminated film 2 having a configuration excluding the auxiliary layer 50 from the laminated film 2B, and the battery exterior body 70D may be formed by forming the auxiliary layer 50 after sealing the power generation element 200.

[0279] [Modification Example 2] Next, a modification example 2 of Embodiment 3 will be described.

[0280] FIG. 32 is a top view of a battery 100E according to this modification example. FIG. 33 is a cross-sectional view of the battery 100E according to this modification example. Specifically, FIG. 32 is a plan view of the battery 100E when viewed from the positive side in the z-axis direction. Further, in FIG. 32, in the region overlapping the first film portion 71E, the outlines of the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 are indicated by broken lines. FIG. 33 represents a cross-section taken along line XXXIII-XXXIII shown in FIG. 32.

[0281] As shown in FIGS. 32 and 33, the battery 100E according to this modification example mainly differs from the battery 100 according to Embodiment 3 in that the battery 100E includes a battery exterior body 70E instead of the battery exterior body 70, and in that the electrode terminal 310 and the counter electrode terminal 320 are drawn out in the same direction.

[0282] The electrode terminal 310 is drawn out from the negative side end of the battery exterior body 70E in the x-axis direction, and a part of the electrode terminal 310 is exposed. Further, the counter electrode terminal 320 is drawn out from the negative side end of the battery exterior body 70E at a position different from the electrode terminal 310, and a part of the counter electrode terminal 320 is exposed. Therefore, the electrode terminal 310 and the counter electrode terminal 320 are drawn out in the same direction. Further, in a plan view, the electrode terminal 310 and the counter electrode terminal 320 are arranged side by side along the y-axis direction with a gap therebetween.

[0283] The battery exterior body 70E is an example of one or more laminate films and is composed of one of the above laminate films 2. The battery exterior body 70E includes a first film portion 71E and a second film portion 72E. The first film portion 71E and the second film portion 72E face each other so as to sandwich the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 from above and below. The first film portion 71E is a part of the laminate film 2, and the second film portion 72E is the remaining part of the laminate film 2.

[0284] In the battery exterior body 70E, one laminate film 2 is bent and used. Further, in the battery exterior body 70E, it is used after being rotated 90° from the orientation of the laminate film 2 described in FIGS. 14 and 15. Specifically, the laminate film 2 is folded back and bent in the x-axis direction so that each of the first region 41, the second region 42, and the insulating portion 35 is bent. The power generation element 200 is sandwiched between the bent laminate films 2. Each of the first film portion 71E and the second film portion 72E has a first region 41 and a second region 42. In the examples shown in FIGS. 32 and 33, in a plan view, the positions of the first region 41 and the second region 42 in the first film portion 71E and the second film portion 72E are the same.

[0285] In the examples shown in FIGS. 32 and 33, in the first film portion 71E and the second film portion 72E, in a plan view, the first region 41 overlaps with the electrode terminal 310 and does not overlap with the counter electrode terminal 320, and the second region 42 overlaps with the counter electrode terminal 320 and does not overlap with the electrode terminal 310. Also, each of the first film portion 71E and the second film portion 72E is adhered to the electrode terminal 310 in the first region 41 and is adhered to the counter electrode terminal 320 in the second region 42. Further, each of the first film portion 71E and the second film portion 72E is not adhered to the electrode terminal 310 in a region other than the first region 41 and is not adhered to the counter electrode terminal 320 in a region other than the second region 42.

[0286] In the battery exterior body 70E, the adhesive sealing portion 91 and the adhesive sealing portion 92 are located on the same side of the power generation element 200 (specifically, the negative side in the x-axis direction of the power generation element 200) in a plan view. The adhesive sealing portion 91 and the adhesive sealing portion 92 are arranged along the y-axis direction at the end portion on the negative side in the x-axis direction of the battery exterior body 70 in a plan view. The adhesive sealing portion 91 is located in the first region 41 in the first film portion 71E and the second film portion 72E. The adhesive sealing portion 92 is located in the second region 42 in the first film portion 71E and the second film portion 72E.

[0287] Even when the adhesive sealing portion 91 and the adhesive sealing portion 92 are located on the same side of the power generation element 200 in a plan view, in the laminate film 2, since the first metal layer 21 and the second metal layer 22 are electrically insulated from each other, when the first metal layer 21 comes into contact with the electrode terminal 310 and the second metal layer 22 comes into contact with the counter electrode terminal 320 during the heat sealing process of the laminate film 2, the short circuit between the electrode terminal 310 and the counter electrode terminal 320 is suppressed. Therefore, a highly reliable battery 100E can be realized.

[0288] Note that the battery exterior body 70E may be composed of two laminate films 2. Further, the battery exterior body 70E of the battery 100E according to this modification example may be composed of a laminate film according to any one of Embodiment 1 other than the laminate film 2, each modification example of Embodiment 1, Embodiment 2, and each modification example of Embodiment 2.

[0289] [Modification Example 3] Next, Modification Example 3 of Embodiment 3 will be described.

[0290] FIG. 34 is a top view of the battery 100F according to this modification example. FIG. 35 is a cross-sectional view of the battery 100F according to this modification example. Specifically, FIG. 34 is a plan view of the battery 100F when viewed from the positive side in the z-axis direction. Further, in FIG. 34, in the region overlapping the first film portion 71F, the outline of the power generation element 200 is indicated by a broken line. Further, FIG. 35 shows a cross-section taken along line XXXV-XXXV shown in FIG. 34.

[0291] As shown in FIGS. 34 and 35, the battery 100F according to this modification example is mainly different from the battery 100 according to Embodiment 3 in that it includes a battery exterior body 70F, a power generation element 201, an electrode terminal 311, and a counter electrode terminal 321 instead of the battery exterior body 70, the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320. Further, the battery 100F according to this modification example is also different from the battery 100 according to Embodiment 3 in that it further includes a counter electrode insulating layer 161, an electrode insulating layer 162, an electrode conductive layer 171, a counter electrode conductive layer 172, and an insulating layer 330.

[0292] First, the details of the configurations of the power generation element 201, the counter electrode insulating layer 161, the electrode insulating layer 162, the electrode conductive layer 171, the counter electrode conductive layer 172, and the insulating layer 330 will be described. FIG. 36 is a cross-sectional view of the power generation element 201 according to this modification example. In FIG. 36, the counter electrode insulating layer 161, the electrode insulating layer 162, the electrode conductive layer 171, the counter electrode conductive layer 172, and the insulating layer 330 are also shown together with the power generation element 201.

[0293] In plan view, the shape of the power generation element 201 is rectangular, for example, as shown in FIG. 34. That is, the shape of the power generation element 201 is a flat rectangular parallelepiped. The shape of the power generation element 201 in plan view may be other polygons such as a square, a hexagon, or an octagon, or may be a circle or an ellipse.

[0294] As shown in FIG. 36, the power generation element 201 includes four side surfaces including side surfaces 231 and 241, and two main surfaces 211 and 221. In the example shown in FIG. 36, all of the four side surfaces including side surfaces 231 and 241 and the two main surfaces 211 and 221 are flat surfaces.

[0295] The side surfaces 231 and 241 face away from each other and are parallel to each other. Also, the four side surfaces including the side surfaces 231 and 241 stand perpendicular to the main surfaces 211 and 221 from each side of the main surfaces 211 and 221. The four side surfaces are parallel to the stacking direction. Note that at least one of the four side surfaces may be inclined with respect to the stacking direction. The main surfaces 211 and 221 face away from each other and are parallel to each other. The main surface 211 is the uppermost surface of the power generation element 201. The main surface 221 is the lowermost surface of the power generation element 201.

[0296] As shown in FIG. 36, the power generation element 201 has a plurality of battery cells 150. The power generation element 201 is, for example, an all-solid-state battery. The plurality of battery cells 150 are electrically connected in parallel and stacked. In the example shown in FIG. 36, all the battery cells 150 included in the power generation element 201 are electrically connected in parallel. The configurations of the plurality of battery cells 150 are substantially the same as each other. In two adjacent battery cells 150, the arrangement order of each layer constituting the battery cell 150 is reversed. That is, while the arrangement order of each layer constituting the battery cell 150 is alternately switched, the plurality of battery cells 150 are arranged and stacked along the z-axis. In the example shown in FIG. 36, the number of battery cells 150 included in the power generation element 201 is four, but it is not limited thereto. Note that at least a part of the plurality of battery cells 150 may be electrically connected in series.

[0297] As shown in FIG. 36, in the power generation element 201, the current collectors are shared between two adjacent battery cells 150. For example, the lowermost battery cell 150 and the battery cell 150 one above it share one counter electrode current collector 121.

[0298] Such a power generation element 201 is formed by laminating not only the battery cell 150 shown in FIG. 37A but also the battery cells 150B and 150C shown in FIGS. 37B and 37C in combination. Here, the battery cell 150 shown in FIG. 37A will be described as the battery cell 150A. FIG. 37A is a cross-sectional view of the battery cell 150A included in the power generation element 201 according to this modification. FIG. 37B is a cross-sectional view of another battery cell 150B included in the power generation element 201 according to this modification. FIG. 37C is a cross-sectional view of still another battery cell 150C included in the power generation element 201 according to this modification.

[0299] The battery cell 150B shown in FIG. 37B has a configuration obtained by removing the electrode current collector 111 from the battery cell 150A shown in FIG. 37A. That is, the electrode layer 110B of the battery cell 150B consists only of the electrode active material layer 112.

[0300] The battery cell 150C shown in FIG. 37C has a configuration obtained by removing the counter electrode current collector 121 from the battery cell 150A shown in FIG. 37A. That is, the counter electrode layer 120C of the battery cell 150C consists only of the counter electrode active material layer 122.

[0301] In the formation of the power generation element 201, for example, the battery cell 150A is disposed at the lowermost layer, and the battery cells 150C and 150B are alternately laminated downward. At this time, the battery cell 150A and the battery cell 150B are laminated in a direction opposite to the direction shown in FIG. 37A or FIG. 37B, respectively. Thereby, the power generation element 201 is formed.

[0302] Note that the method of forming the power generation element 201 is not limited thereto. For example, the battery cell 150A may be disposed on the uppermost layer. Alternatively, the battery cell 150A may be disposed at a position different from both the uppermost layer and the lowermost layer. Also, a plurality of battery cells 150A may be used. Further, by performing double-sided coating on a single current collector, a unit of two battery cells 150 sharing the current collector may be formed, and the formed units may be stacked. Also, two adjacent battery cells 150 of the power generation element 201 may not share a current collector, and two current collectors may be overlapped at the boundary portion between two adjacent battery cells 150.

[0303] As shown in FIG. 36, the counter electrode insulating layer 161 covers the counter electrode layer 120 on the side surface 231. Specifically, the counter electrode insulating layer 161 completely covers the counter electrode current collector 121 and the counter electrode active material layer 122 on the side surface 231. Also, the counter electrode insulating layer 161 covers the counter electrode layer 120 of each of the plurality of battery cells 150 on the side surface 231. The counter electrode insulating layer 161 does not cover at least a part of the electrode layer 110 of each of the plurality of battery cells 150. For example, the counter electrode insulating layer 161 does not cover the electrode current collector 111. Therefore, the counter electrode insulating layer 161 has, for example, a stripe shape in a plan view of the side surface 231.

[0304] As shown in FIG. 36, the electrode insulating layer 162 covers the electrode layer 110 on the side surface 241. Specifically, the electrode insulating layer 162 completely covers the electrode current collector 111 and the electrode active material layer 112 on the side surface 241. Also, the electrode insulating layer 162 covers the electrode layer 110 of each of the plurality of battery cells 150 on the side surface 241. The electrode insulating layer 162 does not cover at least a part of the counter electrode layer 120 of each of the plurality of battery cells 150. For example, the electrode insulating layer 162 does not cover the counter electrode current collector 121. Therefore, the electrode insulating layer 162 has, for example, a stripe shape in a plan view of the side surface 241.

[0305] The counter electrode insulating layer 161 and the electrode insulating layer 162 are each formed using an insulating material having electrical insulation properties. For example, the counter electrode insulating layer 161 and the electrode insulating layer 162 each contain a resin. The resin is, for example, an epoxy-based resin, but is not limited thereto. Note that an inorganic material may be used as the insulating material. The insulating material to be used is selected based on various properties such as flexibility, gas barrier properties, impact resistance, and heat resistance. The counter electrode insulating layer 161 and the electrode insulating layer 162 may be formed using the same material as each other, or may be formed using different materials.

[0306] As shown in FIG. 36, the electrode conductive layer 171 is a conductive portion that covers the side surface 231 and the counter electrode insulating layer 161 and is electrically connected to the electrode layer 110. Specifically, the electrode conductive layer 171 covers the counter electrode insulating layer 161 and the portion of the side surface 231 that is not covered by the counter electrode insulating layer 161.

[0307] End faces of each of the electrode current collector 111 and the electrode active material layer 112 are exposed in the portion of the side surface 231 that is not covered by the counter electrode insulating layer 161. For this reason, the electrode conductive layer 171 contacts the end faces of each of the electrode current collector 111 and the electrode active material layer 112 and is electrically connected to the electrode layer 110.

[0308] The electrode conductive layer 171 is electrically connected to the electrode layer 110 of each of the plurality of battery cells 150. That is, the electrode conductive layer 171 functions to electrically connect the respective battery cells 150 in parallel. As shown in FIG. 36, the electrode conductive layer 171 covers substantially the entire side surface 231 from the lower end to the upper end.

[0309] As shown in FIG. 36, the counter electrode conductive layer 172 is a conductive portion that covers the side surface 241 and the electrode insulating layer 162 and is electrically connected to the counter electrode layer 120. Specifically, the counter electrode conductive layer 172 covers the electrode insulating layer 162 and the portion of the side surface 241 that is not covered by the electrode insulating layer 162.

[0310] At portions of the side surface 241 that are not covered by the electrode insulating layer 162, the end faces of the counter electrode current collector 121 and the counter electrode active material layer 122 are exposed. Therefore, the counter electrode conductive layer 172 contacts the end faces of the counter electrode current collector 121 and the counter electrode active material layer 122, and is electrically connected to the counter electrode layer 120.

[0311] The counter electrode conductive layer 172 is electrically connected to the counter electrode layer 120 of each of the plurality of battery cells 150. That is, the counter electrode conductive layer 172 functions to electrically connect the respective battery cells 150 in parallel. As shown in FIG. 36, the counter electrode conductive layer 172 covers substantially the entire area from the lower end to the upper end of the side surface 241.

[0312] The electrode conductive layer 171 and the counter electrode conductive layer 172 are formed using a conductive resin material or the like. The conductive resin material includes, for example, a resin and a conductive material composed of metal particles or the like filled in the resin. Alternatively, the electrode conductive layer 171 and the counter electrode conductive layer 172 may be formed using a metal material such as solder. The conductive material that can be used is selected based on various properties such as flexibility, gas barrier property, impact resistance, heat resistance, and solder wetting property. The electrode conductive layer 171 and the counter electrode conductive layer 172 are formed using the same material as each other, but may also be formed using different materials.

[0313] The electrode terminal 311 is electrically connected to the electrode layer 110 via the electrode conductive layer 171. As shown in FIG. 36, the electrode terminal 311 is an electrode pad directly disposed on the main surface 211 of the power generation element 201. The electrode terminal 311 may be disposed on the main surface 211 via an intermediate layer. In the example shown in FIG. 36, the electrode terminal 311 contacts the electrode conductive layer 171 at the end face. Note that the main surface of the electrode terminal 311 may be covered by the electrode conductive layer 171.

[0314] The counter electrode terminal 321 is electrically connected to the counter electrode layer 120 via the counter electrode conductive layer 172. As shown in FIG. 36, the counter electrode terminal 321 is a counter electrode pad disposed on the main surface 211 of the power generation element 201 at a position different from the electrode terminal 311 via an insulating layer 330. Thus, in this specification, the term "disposed on the main surface" is used in the sense that it includes not only the case of being directly disposed on the main surface but also the case of being disposed via another layer. In the example shown in FIG. 36, the counter electrode terminal 321 is in contact with the counter electrode conductive layer 172 at the end face. Note that the main surface of the counter electrode terminal 321 may be covered with the counter electrode conductive layer 172.

[0315] The electrode terminal 311 and the counter electrode terminal 321 are each formed using a conductive material. For example, the electrode terminal 311 and the counter electrode terminal 321 are a metal foil or a metal plate made of a metal such as copper, aluminum, or stainless steel. Alternatively, the electrode terminal 311 and the counter electrode terminal 321 may be a cured solder.

[0316] The insulating layer 330 is disposed between the counter electrode terminal 321 and the main surface 211. In the example shown in FIG. 36, the main surface 211 is the main surface of the electrode current collector 111, and the insulating layer 330 insulates the uppermost electrode layer 110 and the counter electrode terminal 321.

[0317] The insulating layer 330 is formed using an insulating material. For example, the insulating layer 330 contains a resin. The resin is, for example, an epoxy-based resin, but is not limited thereto. Note that an inorganic material may be used as the insulating material.

[0318] Note that if the electrode terminal 311 is electrically connected to the electrode layer 110 of the power generation element 201 and the counter electrode terminal 321 is electrically connected to the counter electrode layer 120 of the power generation element 201, the electrical connection structure between the electrode terminal 311 and the electrode layer 110 and the electrical connection structure between the counter electrode terminal 321 and the counter electrode layer 120 are not particularly limited.

[0319] Referring again to FIGS. 34 and 35, the battery exterior body 70F seals the power generation element 201. The battery exterior body 70F is an example of one or more laminate films and is composed of two of the above laminate films 1A. The battery exterior body 70F includes a first film portion 71F and a second film portion 72F. The first film portion 71F and the second film portion 72F face each other so as to sandwich the power generation element 201, the electrode terminal 311, and the counter electrode terminal 321 from above and below. Also, the first film portion 71F is composed of one laminate film 1A in which a first opening 81 and a second opening 82 are formed. The second film portion 72F is composed of one laminate film 1A in which no opening is formed. The power generation element 201 is sandwiched between these two laminate films 1A. In the example shown in FIG. 35, the laminate films 1A having different sizes of the first region 41, the second region 42, and the third region 43 are used for the first film portion 71F and the second film portion 72F, but laminate films 1A having the same size for each of the first region 41, the second region 42, and the third region 43 may be used.

[0320] The electrode terminal 311 and the counter electrode terminal 321 are arranged between the first film portion 71F and the power generation element 201. Also, since the electrode terminal 311 and the counter electrode terminal 321 are not arranged on the main surface 221 which is the lower surface of the power generation element 201, the electrode terminal 311 and the counter electrode terminal 321 are not arranged between the second film portion 72F and the power generation element 201. In the example shown in FIGS. 34 and 35, in the first film portion 71F, in a plan view, the first region 41 overlaps with the electrode terminal 311 and does not overlap with the counter electrode terminal 321, and the second region 42 overlaps with the counter electrode terminal 321 and does not overlap with the electrode terminal 311.

[0321] In the first region 41 of the first film portion 71F, a first opening 81 is formed to expose a part of the electrode terminal 311, specifically, a part of the upper surface of the electrode terminal 311. The first opening 81 penetrates the first film portion 71F in the thickness direction. Also, in the second region 42 of the first film portion 71F, a second opening 82 is formed to expose a part of the counter electrode terminal 321, specifically, a part of the upper surface of the counter electrode terminal 321. The second opening 82 penetrates the first film portion 71F in the thickness direction. The first opening 81 and the second opening 82 are formed, for example, before the power generation element 201 is sealed by the battery exterior 70F. The first opening 81 and the second opening 82 may be formed during or after the sealing of the power generation element 201 by the battery exterior 70F.

[0322] The battery exterior 70F seals the power generation element 201 such that the first film portion 71F and the second film portion 72F are adhered, and the first film portion 71F adheres to the electrode terminal 311 and the counter electrode terminal 321, so that a part of the electrode terminal 311 and a part of the counter electrode terminal 321 are exposed. In the example shown in FIG. 34, in a plan view, heat sealing treatment is performed on the entire outer peripheral portion of the battery exterior 70F and around the first opening 81 and the second opening 82, and the power generation element 201 is sealed in the battery exterior 70F. In the examples shown in FIGS. 34 and 35, the first film portion 71F adheres to the electrode terminal 311 in the first region 41 and adheres to the counter electrode terminal 321 in the second region 42. Also, the first film portion 71F does not adhere to the electrode terminal 311 in regions other than the first region 41 and does not adhere to the counter electrode terminal 321 in regions other than the second region 42. Specifically, the battery exterior 70F has adhesive sealing portions 91F, 92F, and 93 as heat fusion portions for sealing the power generation element 201.

[0323] The adhesive sealing portion 91F is a portion where the first film portion 71F adheres to the electrode terminal 311 around the first opening 81 in the battery exterior 70F. Also, the adhesive sealing portion 91F is located in the first region 41 of the first film portion 71F. The electrode terminal 311 is directly adhered to the first film portion 71F.

[0324] Next, the sealing portion 92F is the portion where the first film portion 71F is adhered to the counter electrode terminal 321 around the second opening 82 in the battery exterior body 70F. Further, the adhesive sealing portion 92F is located in the second region 42 in the first film portion 71F. The counter electrode terminal 321 is directly adhered to the first film portion 71F.

[0325] As described above, in the laminate film 1A, since the first metal layer 21 and the second metal layer 22 are electrically insulated, even when the first metal layer 21 comes into contact with the electrode terminal 311 and the second metal layer 22 comes into contact with the counter electrode terminal 321 during the heat sealing process of the laminate film 1A, short - circuiting between the electrode terminal 311 and the counter electrode terminal 321 is suppressed. Therefore, a highly reliable battery 100F can be realized.

[0326] Note that the battery exterior body 70F may be composed of one laminate film 1A. In this case, as described for the battery 100, one laminate film 1A is used after being folded. Also, the battery exterior body 70F of the battery 100F according to this modification may be composed of a laminate film according to any of Embodiment 1 other than the laminate film 1A, each modification of Embodiment 1, Embodiment 2, and each modification of Embodiment 2.

[0327] Also, in the above example, the electrode terminal 311 and the counter electrode terminal 321 are arranged on the same main surface 211, but it is not limited to this. One of the electrode terminal 311 and the counter electrode terminal 321 may be arranged on the main surface 211, and the other of the electrode terminal 311 and the counter electrode terminal 321 may be arranged on the main surface 221. In this case, corresponding to the arrangement of the electrode terminal 311 and the counter electrode terminal 321, the first opening 81 is formed in one of the first film portion 71F and the second film portion 72, and the second opening 82 is formed in the other of the first film portion 71F and the second film portion 72.

[0328] [Manufacturing Method] Subsequently, the manufacturing method of the battery according to Embodiment 3 and each modification of Embodiment 3 described above will be explained.

[0329] FIG. 38 is a flowchart showing an example of a method for manufacturing a battery according to Embodiment 3 and each modification of Embodiment 3. Hereinafter, an example of the method for manufacturing the battery 100 will be mainly described. Note that the manufacturing method described below is an example, and the method for manufacturing a battery according to Embodiment 3 and each modification of Embodiment 3 is not limited to the following example.

[0330] As shown in FIG. 38, first, a laminate film 1A is prepared (step S31). Note that, in accordance with the configuration of the battery to be manufactured, one or more laminate films including a laminate film according to any one of Embodiment 1, each modification of Embodiment 1, Embodiment 2, and each modification of Embodiment 2 as the first laminate film may be prepared. Hereinafter, a case where one laminate film 1A is used will be described as an example.

[0331] Next, a power generation element 200 having an electrode layer 110, a counter electrode layer 120, and a solid electrolyte layer 130 is prepared (step S32). Also, an electrode terminal 310 and a counter electrode terminal 320 are prepared (step S33). Then, the electrode terminal 310 is connected to the electrode layer 110 on the main surface 210, and the counter electrode terminal 320 is connected to the counter electrode layer 120 on the main surface 220. Note that the order of preparing the laminate film 1A, the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 is not particularly limited.

[0332] Next, the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 are sandwiched between a first film portion 71 and a second film portion 72, which are opposing portions in the laminate film 1A (step S34). For example, the laminate film 1A is folded at the folding position 75 so as to sandwich the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320.

[0333] Next, the power generation element 200 is sealed so that a part of the electrode terminal 310 and a part of the counter electrode terminal 320 are exposed by the laminate film 1A (step S35). At this time, at the end portion of the folded laminate film 1A in plan view, the first film portion 71 and the second film portion 72 are adhered, and the first film portion 71 and the second film portion 72 are adhered to the electrode terminal 310 and the counter electrode terminal 320. Thereby, the power generation element 200 is sealed by the laminate film 1A, and the battery 100 is formed.

[0334] In step S35, the first film portion 71 and the second film portion 72 are adhered to the electrode terminal 310 in the first region 41 and adhered to the counter electrode terminal 320 in the second region 42. The adhesion at this time is performed by thermal fusion. That is, a heat sealing process is performed on the laminate film 1A. For example, the adhesive seal portions 91, 92, and 93 are formed by thermocompression bonding the first film portion 71 and the second film portion 72. At this time, the thermocompression bonding for forming the adhesive seal portion 91 and the adhesive seal portion 93 around the adhesive seal portion 91 may be performed simultaneously. Similarly, the thermocompression bonding for forming the adhesive seal portion 92 and the adhesive seal portion 93 around the adhesive seal portion 92 may be performed simultaneously. For example, the thermocompression bonding of at least one side of the contour of the battery exterior body 70 in plan view is performed simultaneously. Since the electrode terminal 310 and the counter electrode terminal 320 are sandwiched between the first film portion 71 and the second film portion 72, in the thermocompression bonding for forming the adhesive seal portions 91 and 92, the pressure tends to be high, and the electrode terminal 310 and the counter electrode terminal 320 are likely to contact the metal layer of the laminate film. By using the laminate film 1A for sealing the power generation element 200, even when the electrode terminal 310 contacts the first metal layer 21 and the counter electrode terminal 320 contacts the second metal layer 22, since the first metal layer 21 and the second metal layer 22 are electrically insulated, a short circuit between the electrode terminal 310 and the counter electrode terminal 320 can be suppressed.

[0335] Also, the sealing of the power generation element 200 with the laminate film 1A may be performed in a reduced-pressure atmosphere. In this case, heat fusion other than when completing the sealing may be performed in a normal pressure atmosphere (i.e., atmospheric pressure). Further, when manufacturing the battery 100F, after performing heat fusion at all locations other than the adhesive sealing portions 91F and 92F in a normal pressure atmosphere first, the adhesive sealing portions 91F and 92F around the first opening 81 and the second opening 82 may be formed in a reduced-pressure atmosphere.

[0336] Also, before sandwiching the power generation element 200 with the laminate film 1A in step S34, a part of the folded laminate film 1A may be heat-fused to form a bag-shaped or tubular laminate film 1A. Then, by inserting the power generation element 200 into the bag-shaped or tubular laminate film 1A, the power generation element 200 may be sandwiched, and heat fusion of the remaining portion may be performed.

[0337] (Embodiment 4) Next, Embodiment 4 will be described. Specifically, in Embodiment 4, a battery including a battery exterior body composed of one or more laminate films including the laminate film according to any one of the above Embodiment 1, each modification of Embodiment 1, Embodiment 2, and each modification of Embodiment 2 as the first laminate film will be described, where the electrode layer is electrically connected to the first metal layer or the second metal layer. In the following description of Embodiment 4, the description will focus on the differences from the above Embodiments 1, 2, and 3, and each modification of Embodiments 1, 2, and 3, and the description of the common points will be omitted or simplified.

[0338] FIG. 39 is a top view of the battery 100G according to the present embodiment. FIG. 40 is a cross-sectional view of the battery 100G according to the present embodiment. Specifically, FIG. 39 is a plan view of the battery 100G when viewed from the positive side in the z-axis direction. Also, in FIG. 39, in the region overlapping the first film portion 71G, the outlines of the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 are shown by broken lines. Further, FIG. 40 shows a cross-section along the line XL-XL shown in FIG. 39.

[0339] As shown in FIGS. 39 and 40, the battery 100G includes a power generation element 200, a battery exterior body 70G, an electrode terminal 310, and a counter electrode terminal 320.

[0340] The details of the configurations of the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 are as described with reference to FIG. 23 in the above-described Embodiment 3.

[0341] As shown in FIGS. 23, 39, and 40, the electrode terminal 310 is an electrode lead that is electrically connected to the electrode layer 110 and drawn out to the outside of the power generation element 200 in a plan view. A part of the electrode terminal 310 is disposed inside the battery exterior body 70G. The electrode terminal 310 is drawn out from the negative side end of the battery exterior body 70G in the x-axis direction, and a part of the electrode terminal 310 is exposed.

[0342] The counter electrode terminal 320 is a counter electrode lead that is electrically connected to the counter electrode layer 120 and drawn out to the outside of the power generation element 200 in a plan view. A part of the counter electrode terminal 320 is disposed inside the battery exterior body 70G. The counter electrode terminal 320 is drawn out from the positive side end of the battery exterior body 70G in the x-axis direction, and a part of the counter electrode terminal 320 is exposed. Therefore, the electrode terminal 310 and the counter electrode terminal 320 are drawn out in opposite directions to each other.

[0343] Note that the electrode terminal 310 and the counter electrode terminal 320 are not limited to leads, and for example, they may be pads provided on the main surface 210 or 220 of the power generation element 200. Further, the electrode current collector 111 and the counter electrode current collector 121 may function as terminals without providing the electrode terminal 310 and the counter electrode terminal 320. In these cases, an opening for exposing the pad or the current collector may be formed in the battery exterior body 70G.

[0344] Next, with reference to FIGS. 39 and 40, details of the battery exterior body 70G will be described.

[0345] The battery exterior body 70G seals the power generation element 200 so as to expose a part of the electrode terminal 310 and a part of the counter electrode terminal 320. The battery exterior body 70G is an example of one or more laminate films and is composed of two of the above laminate films 1B. The battery exterior body 70G includes a first film portion 71G and a second film portion 72G. The first film portion 71G and the second film portion 72G face each other so as to sandwich the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 from above and below. The first film portion 71G is a portion that covers the power generation element 200 from above, and the second film portion 72G is a portion that covers the power generation element 200 from below. Also, each of the first film portion 71G and the second film portion 72G is composed of, for example, one laminate film 1B having the same size as each other in plan view.

[0346] In the battery exterior body 70G, two laminate films 1B are used so as to overlap in plan view. The power generation element 200 is sandwiched between two laminate films 1B. Each of the first film portion 71G and the second film portion 72G has a first region 41, a second region 42, and a third region 43. In the examples shown in FIGS. 39 and 40, in plan view, the positions of the first region 41, the second region 42, and the third region 43 are the same in the first film portion 71G and the second film portion 72G.

[0347] In each of the first film portion 71G and the second film portion 72G, in plan view, one of the first region 41 and the second region 42 overlaps with the electrode terminal 310 and does not overlap with the counter electrode terminal 320, and the other of the first region 41 and the second region 42 overlaps with the counter electrode terminal 320 and does not overlap with the electrode terminal 310. In the examples shown in FIGS. 39 and 40, in the first film portion 71G and the second film portion 72G, in plan view, the first region 41 overlaps with the electrode terminal 310 and does not overlap with the counter electrode terminal 320, and the second region 42 overlaps with the counter electrode terminal 320 and does not overlap with the electrode terminal 310.

[0348] Further, in the first film portion 71G and the second film portion 72G, in a plan view, the third region 43 overlaps at least a part of the power generation element 200. In the first film portion 71G and the second film portion 72G, in a plan view, the third region 43 may overlap the entire power generation element 200.

[0349] Also, in the example shown in FIG. 40, in the first film portion 71G and the second film portion 72G, the lamination order of the first resin film 11, the first metal layer 21, the insulating layer 30, the second metal layer 22, and the second resin film 12 is the same in the vertical direction. In the first film portion 71G, the first metal layer 21 is closer to the power generation element 200 than the second metal layer 22. Also, in the first film portion 71G, the first resin film 11 is closer to the power generation element 200 than the second resin film 12 and is in contact with the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320. On the other hand, in the second film portion 72G, the second metal layer 22 is closer to the power generation element 200 than the first metal layer 21. Also, in the second film portion 72G, the second resin film 12 is closer to the power generation element 200 than the first resin film 11 and is in contact with the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320. Note that in at least one of the first film portion 71G and the second film portion 72G, the lamination order of the first resin film 11, the first metal layer 21, the insulating layer 30, the second metal layer 22, and the second resin film 12 may be reversed in the vertical direction from the example shown in FIG. 40.

[0350] Also, laminate films having different lamination configurations may be used for the first film portion 71G and the second film portion 72G. For example, for the second film portion 72G, a known laminate film such as a three-layer laminate film in which only one metal layer is disposed throughout between the first resin film 11 and the second resin film 12 may be used. Also, for the second film portion 72G, a laminate film according to any one of Embodiment 1 other than the laminate film 1B, each modification of Embodiment 1, Embodiment 2, and each modification of Embodiment 2 may be used.

[0351] The battery exterior body 70G seals the power generation element 200 such that a part of the electrode terminal 310 and a part of the counter electrode terminal 320 are exposed, by adhering the first film portion 71G and the second film portion 72G, and the first film portion 71G and the second film portion 72G are adhered to the electrode terminal 310 and the counter electrode terminal 320. In the example shown in FIG. 39, in a plan view, a heat sealing process is performed on the entire outer peripheral portion of the battery exterior body 70G, and the power generation element 200 is sealed in the battery exterior body 70G. By the heat sealing process, the first resin film 11 and the second resin film 12 are melted and heat-sealed to the contacting portions. Note that as long as the power generation element 200 can be sealed, the shape of the battery exterior body 70G and the position of the heat sealing process are not particularly limited.

[0352] Each of the first film portion 71G and the second film portion 72G is adhered to the electrode terminal 310 in one of the first region 41 and the second region 42, and is adhered to the counter electrode terminal 320 in the other of the first region 41 and the second region 42. In the examples shown in FIGS. 39 and 40, each of the first film portion 71G and the second film portion 72G is adhered to the electrode terminal 310 in the first region 41, and is adhered to the counter electrode terminal 320 in the second region 42. Also, each of the first film portion 71G and the second film portion 72G is not adhered to the electrode terminal 310 in a region other than the first region 41, and is not adhered to the counter electrode terminal 320 in a region other than the second region 42. Specifically, the battery exterior body 70G has adhesion sealing portions 91, 92, and 93 as heat-sealed portions for sealing the power generation element 200. In the battery exterior body 70G, for example, a heat sealing process is not performed in portions other than the adhesion sealing portions 91, 92, and 93.

[0353] Next, the sealing portion 91 is a portion in the battery exterior body 70G where the first film portion 71G and the second film portion 72G sandwich the electrode terminal 310 and adhere to the electrode terminal 310. Also, in the example shown in FIG. 39, the adhesive sealing portion 91 is a portion that overlaps the electrode terminal 310 among the ends of the battery exterior body 70G in a plan view. The adhesive sealing portion 91 is an example of a lead sealing portion. The electrode terminal 310 is sandwiched between the first film portion 71G and the second film portion 72G of the battery exterior body 70G on the side of the power generation element 200 rather than the portion where it is exposed, and is adhered to the respective ends of the first film portion 71G and the second film portion 72G. The electrode terminal 310 is directly adhered to the first film portion 71G and the second film portion 72G. Thereby, since a molten sleeve or the like is not disposed between the electrode terminal 310 and the first film portion 71G and between the electrode terminal 310 and the second film portion 72G, intrusion of moisture into the battery exterior body 70G can be suppressed. The adhesive sealing portion 91 is located in the first region 41 in the first film portion 71G and the second film portion 72G. Also, in the battery exterior body 70G, the adhesive sealing portion 91 and the adhesive sealing portion 92 face each other with the power generation element 200 interposed therebetween. Note that the adhesive sealing portion 91 and the adhesive sealing portion 92 may be located on the same side of the power generation element 200 (specifically, one end in the x-axis direction of the power generation element 200). In this case, the electrode terminal 310 and the counter electrode terminal 320 are drawn out in the same direction.

[0354] The length L1 of the third region 43 in the direction in which the first region 41 and the third region 43 are arranged (the x-axis direction in the example of FIG. 39) is, for example, longer than the length L2 of the adhesive sealing portion 91 in the direction in which the electrode terminal 310 is drawn out (the x-axis direction in the example of FIG. 39). Thereby, the size of the third region 43 can be ensured, and the gas barrier property of the battery exterior body 70G can be enhanced.

[0355] Next, the sealing portion 92 is a portion where the first film portion 71G and the second film portion 72G sandwich the counter electrode terminal 320 and adhere to the counter electrode terminal 320 in the battery exterior body 70G. In the example shown in FIG. 39, the adhesive sealing portion 92 is a portion that overlaps the counter electrode terminal 320 among the ends of the battery exterior body 70G in a plan view. The counter electrode terminal 320 is sandwiched between the first film portion 71G and the second film portion 72G on the power generation element 200 side rather than the portion where it is exposed, and is adhered to the respective ends of the first film portion 71G and the second film portion 72G. The counter electrode terminal 320 is directly adhered to the first film portion 71G and the second film portion 72G. Thereby, since a molten sleeve or the like is not disposed between the counter electrode terminal 320 and the first film portion 71G and between the counter electrode terminal 320 and the second film portion 72G, intrusion of moisture into the battery exterior body 70G can be suppressed. Further, the adhesive sealing portion 92 is located in the second region 42 of the first film portion 71G and the second film portion 72G.

[0356] The length L1 of the third region 43 in the direction in which the second region 42 and the third region 43 are arranged (the x-axis direction in the example of FIG. 39) is, for example, longer than the length L3 of the adhesive sealing portion 92 in the direction in which the counter electrode terminal 320 is pulled out (the x-axis direction in the example of FIG. 39). Thereby, the size of the third region 43 can be secured, and the gas barrier property of the battery exterior body 70G can be enhanced.

[0357] The adhesive sealing portion 93 is a portion where the first film portion 71G and the second film portion 72G adhere to each other in the battery exterior body 70G. In the example shown in FIG. 39, the adhesive sealing portion 93 is a portion that does not overlap the electrode terminal 310 and the counter electrode terminal 320 among the ends of the battery exterior body 70G in a plan view.

[0358] In battery 100G, the electrode terminal 310 is in contact with the first metal layer 21 of the first film portion 71G at the adhesive sealing portion 91. Therefore, the electrode layer 110 is electrically connected to the first metal layer 21 of the first film portion 71G via the electrode terminal 310. As a result, heat of the electrode layer 110 and the electrode terminal 310 escapes more easily to the first metal layer 21 than when heat of the electrode layer 110 and the electrode terminal 310 conducts to the first metal layer 21 through the first resin film 11, and the heat dissipation of the battery 100G can be improved. As a result, since the temperature rise of the battery 100G can be suppressed, for example, the reliability of the battery 100G can be enhanced. The electrode layer 110 is not electrically connected to the second metal layer 22 of the first film portion 71G.

[0359] For example, by increasing the pressure when performing thermocompression bonding for heat sealing, the first resin film 11 between the first metal layer 21 and the electrode terminal 310 is extruded, and the first metal layer 21 is deformed, so that the electrode terminal 310 and the first metal layer 21 come into contact. The contact form between the electrode terminal 310 and the first metal layer 21 is not particularly limited. The first metal layer 21 may be bent, may be deformed so as to be crushed, or a part of the first metal layer 21 may be torn. Also, the electrode terminal 310 may be deformed. In the example shown in FIG. 40, the electrode terminal 310 is not in contact with the first metal layer 21 of the second film portion 72G at the adhesive sealing portion 91, but may be in contact. Also, when the second region 42 is disposed on the counter electrode terminal 320 side in the first film portion 71G, the second metal layer 22 of the first film portion 71G and the electrode terminal 310 may be in contact instead of the first metal layer 21 of the first film portion 71G. That is, the electrode layer 110 may be electrically connected to the second metal layer 22 of the first film portion 71G and may not be electrically connected to the first metal layer 21 of the first film portion 71G.

[0360] Also, in the battery 100G, the counter electrode terminal 320 is in contact with the second metal layer 22 of the second film portion 72G in the adhesive sealing portion 92. Therefore, the counter electrode layer 120 is electrically connected to the second metal layer 22 of the second film portion 72G via the counter electrode terminal 320. As a result, heat of the counter electrode layer 120 and the counter electrode terminal 320 escapes more easily to the second metal layer 22 than when the heat of the counter electrode layer 120 and the counter electrode terminal 320 is conducted to the second metal layer 22 through the second resin film 12, and the heat dissipation performance of the battery 100G can be improved. As a result, since the temperature rise of the battery 100G can be suppressed, for example, the reliability of the battery 100G can be enhanced. The counter electrode layer 120 is not electrically connected to the second metal layer 22 of the second film portion 72G. Also, since the first metal layer 21 of the first film portion 71G and the second metal layer 22 of the second film portion 72G are not electrically connected, the electrode terminal 310 and the counter electrode terminal 320 are not electrically connected via the battery exterior body 70G, and a short circuit between the electrode layer 110 and the counter electrode layer 120 via the battery exterior body 70G does not occur.

[0361] For example, by increasing the pressure when performing thermocompression bonding for heat sealing, the second resin film 12 between the second metal layer 22 and the counter electrode terminal 320 is extruded, and also, since the second metal layer 22 is deformed, the counter electrode terminal 320 and the second metal layer 22 come into contact with each other. The contact form between the counter electrode terminal 320 and the second metal layer 22 is not particularly limited, and the second metal layer 22 may be bent, may be deformed so as to be crushed, or a part of the second metal layer 22 may be torn. Also, the counter electrode terminal 320 may be deformed. In the example shown in FIG. 40, the counter electrode terminal 320 is not in contact with the second metal layer 22 of the first film portion 71G in the adhesive sealing portion 92, but may be in contact. Also, when the first region 41 is disposed on the counter electrode terminal 320 side in the second film portion 72G, the counter electrode terminal 320 may be in contact with the first metal layer 21 of the second film portion 72G instead of the second metal layer 22 of the second film portion 72G. That is, the counter electrode layer 120 may be electrically connected to the first metal layer 21 of the second film portion 72G and may not be electrically connected to the second metal layer 22 of the second film portion 72G.

[0362] Note that one of the contacts between the first metal layer 21 of the first film portion 71G and the electrode terminal 310 and the contact between the second metal layer 22 of the second film portion 72G and the counter electrode terminal 320 may not occur.

[0363] As described above, in the laminate film 1B, since the first metal layer 21 and the second metal layer 22 are electrically insulated from each other, even if the contact between the first metal layer 21 of the first film portion 71G and the electrode terminal 310 and the contact between the second metal layer 22 of the second film portion 72G and the counter electrode terminal 320 occur, the short - circuit between the electrode terminal 310 and the counter electrode terminal 320 is suppressed. Therefore, the reliability of the battery 100G can be improved.

[0364] Also, as shown in FIG. 40, in the battery 100G, for example, a gap 290 exists between the side surface of the power generation element 200 and the battery exterior body 70G. Due to the gap 290, an impact - mitigating effect against external stress can be obtained. The gap 290 may be depressurized compared to the outside of the battery exterior body 70G. Also, the gap 290 may be filled with an insulating material. By filling the gap 290 with an insulating material, the insulation property on the side surface of the power generation element 200 can be enhanced. Note that in the battery 100G, the gap 290 may not exist and the battery exterior body 70G may be in contact with the side surface of the power generation element 200.

[0365] As described above, in the battery 100G, since the electrode layer 110 is electrically connected to the first metal layer 21 of the first film portion 71G and the counter electrode layer 120 is electrically connected to the second metal layer 22 of the second film portion 72G, the heat dissipation property of the battery 100G can be improved.

[0366] The electrode layer 110 and counter electrode layer 120 of the power generation element 200, as well as the electrode terminal 310 and counter electrode terminal 320, are likely to generate heat during the charge and discharge of the battery 100G. The temperature rise of the electrode layer 110 and counter electrode layer 120 is caused by, for example, the reaction heat generated by the charge and discharge reaction of the active material and the energization resistance heat resulting from the interfacial resistance between the current collector and the active material layer. Further, the temperature rise of the electrode terminal 310 and counter electrode terminal 320 is caused by, for example, the charge and discharge current concentrating and flowing through the electrode terminal 310 and counter electrode terminal 320. For example, when the width or thickness of the electrode terminal 310 and counter electrode terminal 320 is small, and when the resistivity of the material of the electrode terminal 310 and counter electrode terminal 320 is large, the electrode terminal 310 and counter electrode terminal 320 are likely to experience a temperature rise. Also, when the area or thickness of the active material layer is large, or when the power generation element 200 includes a plurality of battery cells 150, that is, when the battery capacity of the power generation element 200 is large, the electrode terminal 310 and counter electrode terminal 320 are also likely to experience a temperature rise. Therefore, which of the power generation element 200 and the electrode terminal 310 and counter electrode terminal 320 becomes hot in the battery 100G may vary depending on the structure and specifications of the battery 100G.

[0367] There is a risk that the heat generated in the battery 100G is unevenly distributed and a specific part of the battery 100G becomes hot, leading to a decrease in reliability. For example, when the power generation element 200 becomes particularly hot, the performance of the active material and electrolyte materials may deteriorate, and the progress of degradation over time may be accelerated. Also, a decrease in the interlayer bonding strength and an increase in the interfacial resistance of the power generation element 200 may occur. Further, when a specific part of the battery 100G becomes hot, deformation such as warping of the entire battery 100G is also likely to occur. Also, when the electrode terminal 310 and counter electrode terminal 320 become hot, the electrical resistance of the electrode terminal 310 and counter electrode terminal 320 increases, which may cause the temperature of the electrode terminal 310 and counter electrode terminal 320 to further rise. Also, when the electrical resistance of the electrode terminal 310 and counter electrode terminal 320 increases, a voltage loss may occur and the charge and discharge capacity may decrease. Furthermore, when an extreme temperature difference occurs within the battery 100G, deformation and breakage of the battery 100G may occur due to thermal strain, and even a minute deformation may lead to a risk of fatigue failure due to repeated charge and discharge.

[0368] Therefore, by improving the heat dissipation of the battery 100G as described above, a local temperature rise in the battery 100G can be suppressed, and a decrease in the performance and reliability of the battery 100G can be suppressed.

[0369] Note that the battery exterior 70G may be composed of one laminate film 1B. FIG. 41 is a top view of another battery 100H according to the present embodiment. FIG. 42 is a cross-sectional view of another battery 100H according to the present embodiment. Specifically, FIG. 41 is a plan view of the battery 100H when viewed from the positive side in the z-axis direction. In FIG. 41, in the region overlapping the first film portion 71H, the outlines of the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 are shown by broken lines. Further, FIG. 42 shows a cross-section taken along line XLII-XLII shown in FIG. 41.

[0370] The battery 100H has a configuration in which the battery exterior 70G of the battery 100G is replaced with a battery exterior 70H. In the following description, the battery 100H will be described centering on the differences from the battery 100G, and the description of the common points will be omitted or simplified.

[0371] The battery exterior 70H seals the power generation element 200. The battery exterior 70H is an example of one or more laminate films and is composed of one of the above laminate films 1B. The battery exterior 70H includes a first film portion 71H and a second film portion 72H. The first film portion 71H and the second film portion 72H face each other so as to sandwich the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 from above and below. The first film portion 71H is a part of the laminate film 1B, and the second film portion 72H is the remaining part of the laminate film 1B.

[0372] In the battery exterior body 70H, one laminate film 1B is bent and used. Specifically, the laminate film 1B is folded back and bent in the y-axis direction such that the first region 41, the second region 42, and the third region 43 are each bent. The power generation element 200 is sandwiched between the bent laminate films 1B. In the battery exterior body 70H, the first film portion 71H is a portion that covers the power generation element 200 from above when the laminate film 1B is folded back at the folding position 75, and the second film portion 72H is a portion that covers the power generation element 200 from below when the laminate film 1B is folded back at the folding position 75. The folding position 75 forms one side of the contour of the battery exterior body 70H in plan view. Each of the first film portion 71H and the second film portion 72H has the first region 41, the second region 42, and the third region 43.

[0373] In the examples shown in FIGS. 41 and 42, in the first film portion 71H and the second film portion 72H, in plan view, the first region 41 overlaps with the electrode terminal 310 and does not overlap with the counter electrode terminal 320, and the second region 42 overlaps with the counter electrode terminal 320 and does not overlap with the electrode terminal 310.

[0374] Further, in the example shown in FIG. 42, in the first film portion 71H and the second film portion 72H, the lamination order of the first resin film 11, the first metal layer 21, the insulating layer 30, the second metal layer 22, and the second resin film 12 is reversed in the vertical direction. Also, in each of the first film portion 71H and the second film portion 72H, the first metal layer 21 is closer to the power generation element 200 than the second metal layer 22. Also, in each of the first film portion 71H and the second film portion 72H, the first resin film 11 is closer to the power generation element 200 than the second resin film 12 and is in contact with the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320. Note that in each of the first film portion 71H and the second film portion 72H, the second resin film 12 may be arranged closer to the power generation element 200 than the first resin film 11.

[0375] The battery exterior body 70H seals the power generation element 200 such that a part of the electrode terminal 310 and a part of the counter electrode terminal 320 are exposed by adhering the first film portion 71H and the second film portion 72H and adhering the first film portion 71H and the second film portion 72H to the electrode terminal 310 and the counter electrode terminal 320. In the example shown in FIG. 41, in a plan view, a heat sealing process is performed on an end portion of the battery exterior body 70H other than the folding position 75, and the power generation element 200 is sealed in the battery exterior body 70H.

[0376] In the examples shown in FIGS. 41 and 42, each of the first film portion 71H and the second film portion 72H adheres to the electrode terminal 310 in the first region 41 and adheres to the counter electrode terminal 320 in the second region 42. Also, each of the first film portion 71H and the second film portion 72H does not adhere to the electrode terminal 310 in a region other than the first region 41 and does not adhere to the counter electrode terminal 320 in a region other than the second region 42.

[0377] The adhesion sealing portion 91 is located in the first region 41 of the first film portion 71H and the second film portion 72H. The adhesion sealing portion 92 is located in the second region 42 of the first film portion 71H and the second film portion 72H. The adhesion sealing portion 93 is a portion that does not overlap the electrode terminal 310 and the counter electrode terminal 320 among the end portions of the battery exterior body 70H other than the folding position 75 in a plan view.

[0378] In the battery 100H, the electrode terminal 310 is in contact with the first metal layer 21 of the first film portion 71H at the adhesion sealing portion 91. Therefore, the electrode layer 110 is electrically connected to the first metal layer 21 of the first film portion 71H via the electrode terminal 310. The electrode layer 110 is not electrically connected to the second metal layer 22 of the first film portion 71H.

[0379] Also, in battery 100H, the counter electrode terminal 320 is not in contact with either the first metal layer 21 or the second metal layer 22 of the second film portion 72H. Therefore, the counter electrode layer 120 is not electrically connected to either the first metal layer 21 or the second metal layer 22 of the second film portion 72H. Note that in battery 100H, the counter electrode terminal 320 may be in contact with the second metal layer 22 of the second film portion 72H at the adhesive sealing portion 92.

[0380] As described above, in battery 100H, the power generation element 200 is sandwiched and sealed between one folded laminate film 1B. As a result, at the folding position 75, the power generation element 200 can be sealed without heat-sealing the laminate film 1B. Therefore, it is not necessary to secure a region for heat-sealing in the vicinity of the folding position 75, and the projected area of battery 100H can be reduced. In addition, since the number of locations where the heat-sealing process is performed is reduced, a short circuit between the electrode layer 110 and the counter electrode layer 120 through the battery exterior body 70H due to the heat-sealing process can be suppressed.

[0381] Note that in batteries 100G and 100H according to Embodiment 4, although the laminate film 1B is used for the battery exterior bodies 70G and 70H, the present invention is not limited to this. The battery exterior body of the battery according to the present embodiment may be composed of a laminate film according to any one of Embodiment 1, each modification of Embodiment 1, Embodiment 2, and each modification of Embodiment 2 other than the laminate film 1B. Examples of such a battery include batteries 100B, 100C, or 100D provided with battery exterior bodies 70B, 70C, or 70D composed of the above laminate films 2, 2A, or 2B as described with reference to FIGS. 26 to 31.

[0382] [Modification 1] Next, Modification 1 of Embodiment 4 will be described. In the following description of Modification 1, the description will focus on the differences from the above Embodiments 1, 2, 3, and 4, and each modification of Embodiments 1, 2, and 3, and the description of the common points will be omitted or simplified.

[0383] FIG. 43 is a top view of the battery 100I according to this modified example. FIG. 44 is a cross-sectional view of the battery 100I according to this modified example. Specifically, FIG. 43 is a plan view of the battery 100I when viewed from the positive side in the z-axis direction. Further, in FIG. 43, in the region overlapping with the first film portion 71D and the heat dissipation auxiliary body 340a, the outlines of the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 are shown by broken lines. Further, FIG. 44 shows a cross-section along the line XLIV-XLIV shown in FIG. 43.

[0384] As shown in FIGS. 43 and 44, the battery 100I according to this modified example mainly differs from another battery 100D according to Modified Example 1 of Embodiment 3 in that it further includes a heat dissipation auxiliary body 340.

[0385] The heat dissipation auxiliary body 340 is connected to the electrode terminal 310 or the counter electrode terminal 320. The heat dissipation auxiliary body 340 is made of a material having a higher thermal conductivity than the material constituting the first resin film 11 and the material constituting the second resin film 12. The heat dissipation auxiliary body 340 is, for example, a metal plate. The heat dissipation auxiliary body 340 is connected to the electrode terminal 310 or the counter electrode terminal 320 by, for example, adhesion or welding. Since the heat dissipation in the battery 100I can be accelerated by the heat dissipation auxiliary body 340 and the heat dissipation performance of the battery 100I can be further improved, the temperature rise of the battery 100I can be suppressed.

[0386] In the example shown in FIGS. 43 and 44, the battery 100I includes three heat dissipation auxiliary bodies 340. In the following description, the three heat dissipation auxiliary bodies 340 may be distinguished as heat dissipation auxiliary bodies 340a, 340b, and 340c for description. The heat dissipation auxiliary bodies 340a and 340b are connected to the electrode terminal 310. The heat dissipation auxiliary body 340c is connected to the counter electrode terminal 320.

[0387] The heat dissipation auxiliary body 340a and the heat dissipation auxiliary body 340b are connected to the surface of the electrode terminal 310 outside the battery exterior body 70D.

[0388] The heat dissipation auxiliary body 340a extends upward along the side surface of the battery exterior body 70D from the position connected to the electrode terminal 310, and further extends in a direction approaching the power generation element 200 along the upper surface of the battery exterior body 70D. The heat dissipation auxiliary body 340a is spaced apart from the battery exterior body 70D. Note that a part of the heat dissipation auxiliary body 340a may be in contact with the battery exterior body 70D.

[0389] The heat dissipation auxiliary body 340b extends downward along the side surface of the battery exterior body 70D from the position connected to the electrode terminal 310, and further extends in a direction approaching the power generation element 200 along the lower surface of the battery exterior body 70D. The heat dissipation auxiliary body 340b is spaced apart from the side surface of the battery exterior body 70D, but is in contact with the lower surface of the battery exterior body 70D. Note that the heat dissipation auxiliary body 340b may be in contact with the side surface of the battery exterior body 70D, and may also be spaced apart from the lower surface of the battery exterior body 70D.

[0390] The heat dissipation auxiliary body 340b is in contact with the auxiliary layer 50. The heat dissipation auxiliary body 340b may be integrally formed with the auxiliary layer 50. Thereby, the auxiliary layer 50 can also be utilized to promote heat dissipation in the battery 100I.

[0391] The heat dissipation auxiliary body 340c is connected to the counter electrode terminal 320 inside the battery exterior body 70D. Thereby, the connection position between the heat dissipation auxiliary body 340c and the counter electrode terminal 320 can be brought closer to the power generation element 200 serving as the heat source, and the heat dissipation effect by the heat dissipation auxiliary body 340c can be enhanced. Further, the heat dissipation auxiliary body 340c is sandwiched between the first film portion 71D and the second film portion 72D together with the counter electrode terminal 320, and heat sealing treatment is performed. Thereby, it becomes easy to bring the heat dissipation auxiliary body 340c and the counter electrode terminal 320 into close contact with each other, and the heat dissipation effect by the heat dissipation auxiliary body 340c can be enhanced.

[0392] The heat dissipation auxiliary body 340c is drawn out from the battery exterior body 70D together with the counter electrode terminal 320 and extends upward along the side surface of the battery exterior body 70D. Further, the heat dissipation auxiliary body 340c extends in a direction away from the power generation element 200 from the portion extending upward along the side surface of the battery exterior body 70D.

[0393] Note that the forms of the heat dissipation auxiliary bodies 340a, 340b, and 340c are just examples, and the form of the heat dissipation auxiliary body 340 is not limited to the above examples. For example, as the heat dissipation auxiliary body 340 connected to the electrode terminal 310 or the counter electrode terminal 320, a heat dissipation auxiliary body 340 having at least one feature of the heat dissipation auxiliary bodies 340a, 340b, and 340c described above can be used.

[0394] Also, the number of the heat dissipation auxiliary bodies 340 provided in the battery 100I is not particularly limited. For example, there may be a heat dissipation auxiliary body 340 that the battery 100I does not include among the heat dissipation auxiliary bodies 340a, 340b, and 340c.

[0395] The width (length in the y-axis direction) of the heat dissipation auxiliary body 340 may be larger than, the same as, or smaller than the widths (lengths in the y-axis direction) of the electrode terminal 310 and the counter electrode terminal 320.

[0396] Here, the outermost surface of the battery 100I will be described.

[0397] The outermost surface of the battery 100I may have a heat dissipation surface that is a portion where the heat of the battery 100I is easily dissipated. The heat dissipation surface is located, for example, at least on one of the outer surface of the battery exterior body 70D and the outer surface of the heat dissipation auxiliary body 340. Examples of the outer surface of the battery exterior body 70D include the main surfaces on the outer sides of the first resin film 11, the second resin film 12, and the auxiliary layer 50. For example, all of at least one of the outer surface of the battery exterior body 70D and the outer surface of the heat dissipation auxiliary body 340 may be the heat dissipation surface, and there may be a portion that is not the heat dissipation surface on the at least one. The ratio of the heat dissipation surface in the outermost surface of the battery 100I is, for example, 50% or more, and may be 70% or more, or 90% or more.

[0398] The heat dissipation surface may have a color tone for increasing the emissivity of the heat dissipation surface. Specific color tones of the heat dissipation surface include black and dark colors. The color tone for increasing the emissivity of the heat dissipation surface is realized, for example, by performing a process such as coating, adhesion, or deposition on the outermost surface of the battery 100I.

[0399] Further, a heat dissipation surface may be formed by using a material with a high emissivity for the material of the member in the portion where the heat dissipation surface is disposed.

[0400] Further, the heat dissipation surface may have a surface shape for promoting heat radiation. The surface shape for promoting heat radiation is realized, for example, by roughening the outermost surface of the battery 100I, or by forming regular protrusions on the outermost surface of the battery 100I by screen coating or inkjet coating. For example, when a large number of stripe-shaped protrusions are provided and the surface on which the protrusions are formed is used as the mounting surface of the battery 100I on the substrate, the recesses formed by the protrusions can be used as ventilation grooves, and the exhaust heat efficiency of the battery 100I can be improved. The true surface area of the heat dissipation surface having a surface shape for promoting heat radiation is, for example, 3 times or more, preferably 5 times or more, and more preferably 10 times or more the geometric surface area of the heat dissipation surface. The geometric surface area is also referred to as the geometric projection area, and is the area of the heat dissipation surface when the heat dissipation surface is projected in a direction perpendicular to the direction in which the heat dissipation surface macroscopically spreads.

[0401] The formation of the heat dissipation surface may be performed after the manufacture of the battery 100I, or may be performed during or before the manufacture of the battery 100I.

[0402] The emissivity of the heat dissipation surface at 25°C is, for example, 0.7 or more, preferably 0.9 or more, and more preferably 0.95 or more. The emissivity is also referred to as the radiation rate. Further, in this specification, the emissivity is the total emissivity for all wavelengths of infrared rays.

[0403] Note that the method for increasing the emissivity of the heat dissipation surface is not limited to the above method. Further, the outermost surface of the battery according to any one of the above-described Embodiment 3 and 4, and each modification of Embodiment 3 may have a heat dissipation surface.

[0404] [Manufacturing Method] Subsequently, a method for manufacturing the battery according to the above-described Embodiment 4 and each modification of Embodiment 4 will be described.

[0405] FIG. 45 is a flowchart showing an example of a method for manufacturing a battery according to Embodiment 4 and each modification of Embodiment 4. Hereinafter, an example of the method for manufacturing the above-described battery 100G will be mainly described. Note that the manufacturing method described below is an example, and the method for manufacturing a battery according to Embodiment 4 and each modification of Embodiment 4 is not limited to the following example.

[0406] As shown in FIG. 45, first, two laminate films 1B are prepared (step S41). Note that, in accordance with the configuration of the battery to be manufactured, one or more laminate films including a laminate film according to any one of Embodiment 1, each modification of Embodiment 1, Embodiment 2, and each modification of Embodiment 2 as the first laminate film may be prepared. Hereinafter, a case where two laminate films 1B are used will be described as an example.

[0407] Next, a power generation element 200 having an electrode layer 110, a counter electrode layer 120, and a solid electrolyte layer 130 is prepared (step S42). Also, an electrode terminal 310 and a counter electrode terminal 320 are prepared (step S43). Then, the electrode terminal 310 is connected to the electrode layer 110 on the main surface 210, and the counter electrode terminal 320 is connected to the counter electrode layer 120 on the main surface 220. Note that the order in which the laminate film 1B, the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 are prepared is not particularly limited.

[0408] Alternatively, instead of the power generation element 200, a power generation element 201 including a plurality of battery cells 150 as described with reference to FIGS. 36, 37A, 37B, and 37C may be prepared.

[0409] Next, sandwich the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320 with two laminate films 1B (step S44). For example, stack the two laminate films 1B so as to sandwich the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320. As a result, one laminate film 1B becomes the first film portion 71G, and the other laminate film 1B becomes the second film portion 72G. When using one laminate film 1B, such as in the battery exterior body 70H, fold the laminate film 1B at the folding position 75 so as to sandwich the power generation element 200, the electrode terminal 310, and the counter electrode terminal 320.

[0410] Next, seal the power generation element 200 with two laminate films 1B such that a part of the electrode terminal 310 and a part of the counter electrode terminal 320 are exposed (step S45). At this time, at the end portion in a plan view of the folded laminate film 1B, bond the first film portion 71G and the second film portion 72G, and bond the first film portion 71G and the second film portion 72G to the electrode terminal 310 and the counter electrode terminal 320. Thereby, the power generation element 200 is sealed with the laminate film 1B.

[0411] In step S45, bond the first film portion 71G and the second film portion 72G to the electrode terminal 310 in the first region 41 and to the counter electrode terminal 320 in the second region 42. The bonding at this time is performed by heat fusion. That is, a heat sealing process is performed on the laminate film 1B. For example, by thermocompression bonding the first film portion 71G and the second film portion 72G, bonding seal portions 91, 92, and 93 are formed. In this thermocompression bonding, sandwich the electrode terminal 310 and the counter electrode terminal 320 between the first film portion 71G and the second film portion 72G. At this time, the thermocompression bonding for forming the bonding seal portion 91 and the bonding seal portion 93 around the bonding seal portion 91 may be performed simultaneously. Similarly, the thermocompression bonding for forming the bonding seal portion 92 and the bonding seal portion 93 around the bonding seal portion 92 may be performed simultaneously. For example, the thermocompression bonding of at least one side of the contour of the battery exterior body 70G in a plan view is performed simultaneously.

[0412] Also, the sealing of the power generation element 200 with the laminate film 1B may be performed in a reduced-pressure atmosphere. In this case, heat fusion other than when completing the sealing may be performed in a normal pressure atmosphere (i.e., atmospheric pressure).

[0413] Also, in step S44, before sandwiching the power generation element 200 with one or two laminate films 1B, a part of one or two laminate films 1B may be heat-fused to form a bag-shaped or tubular laminate film 1B. Then, by putting the power generation element 200 into the bag-shaped or tubular laminate film 1B, the power generation element 200 is sandwiched, and heat fusion of the remaining part may be performed.

[0414] Also, in step S45, when sealing the power generation element 200 with the laminate film 1B, the electrode layer 110 is electrically connected to the first metal layer 21 or the second metal layer 22 by bringing the electrode terminal 310 into contact with the first metal layer 21 or the second metal layer 22 (step S46). Also, in step S45, when sealing the power generation element 200 with the laminate film 1B, the counter electrode layer 120 is electrically connected to the first metal layer 21 or the second metal layer 22 by bringing the counter electrode terminal 320 into contact with the first metal layer 21 or the second metal layer 22 (step S47). Specifically, in the manufacture of the battery 100G, the electrode layer 110 is electrically connected to the first metal layer 21 of the first film portion 71G by bringing the electrode terminal 310 into contact with the first metal layer 21 of the first film portion 71G by thermocompression bonding for forming the adhesive sealing portion 91. Also, the counter electrode layer 120 is electrically connected to the second metal layer 22 of the second film portion 72G by bringing the counter electrode terminal 320 into contact with the second metal layer 22 of the second film portion 72G by thermocompression bonding for forming the adhesive sealing portion 92. Thereby, the battery 100G is formed.

[0415] Note that at least one of step S46 and step S47 may not be performed when sealing the power generation element 200 with the laminate film 1B in step S45. For example, after sealing the power generation element 200 with the laminate film 1B, pressure and heat may be further applied to the portion where the electrode terminal 310 is sandwiched between the first film portion 71G and the second film portion 72G, so that the electrode terminal 310 is brought into contact with the first metal layer 21 of the first film portion 71G. Similarly, after sealing the power generation element 200 with the laminate film 1B, pressure and heat may be further applied to the portion where the counter electrode terminal 320 is sandwiched between the first film portion 71G and the second film portion 72G, so that the counter electrode terminal 320 is brought into contact with the second metal layer 22 of the second film portion 72G.

[0416] (Other embodiments) As described above, the laminate film, the method for manufacturing the laminate film, the battery, and the method for manufacturing the battery according to one or more aspects have been described based on the embodiments and the modified examples. However, the present disclosure is not limited to these embodiments. As long as the gist of the present disclosure is not deviated from, various modifications conceived by those skilled in the art applied to the present embodiments and the modified examples, and the forms constructed by combining the components in different embodiments and modified examples are also included in the scope of the present disclosure.

[0417] For example, in the above-described Embodiments 3 and 4, the power generation elements 200 and 201 were all-solid-state batteries, but the present disclosure is not limited thereto. The power generation elements 200 and 201 may be liquid batteries including an electrolytic solution and a separator.

[0418] Also, for example, in the above-described Embodiments 3 and 4, the laminate film was used for the battery exterior body, but the present disclosure is not limited thereto. The laminate film may be used for applications other than the battery exterior body, such as sealing of electrical devices.

[0419] Further, for example, in the above-described Embodiment 4, the electrode layer 110 is electrically connected to the first metal layer 21 via the electrode terminal 310, but the present invention is not limited thereto. The electrode layer 110 may be electrically connected to the first metal layer 21 or the second metal layer 22 by the electrode current collector 111 contacting the first metal layer 21 or the second metal layer 22. Further, the counter electrode layer 120 may be electrically connected to the first metal layer 21 or the second metal layer 22 by the counter electrode current collector 121 contacting the first metal layer 21 or the second metal layer 22.

[0420] Further, for example, in the above-described Embodiment 4, the first metal layer 21 and the second metal layer 22 were electrically insulated from each other, but the present invention is not limited thereto. The first metal layer 21 and the second metal layer 22 may be electrically connected to each other. For example, the first metal layer 21 and the second metal layer 22 may be in contact with each other in the third region 43 without the insulating layer 30 being present.

[0421] Further, various changes, replacements, additions, omissions, etc. can be made to each of the above-described embodiments within the scope of the claims or the equivalent scope thereof.

Industrial Applicability

[0422] The laminate film and the battery according to the present disclosure can be widely used in batteries for various applications such as electronic devices, electrical appliances, and electric vehicles.

Explanation of Signs

[0423] 1, 1A, 1B, 1C, 1D, 1E, 1F, 2, 2A, 2B laminate film 11 first resin film 12 second resin film 21 first metal layer 22 second metal layer 23 third metal layer 30 insulating layer 31 intermediate layer 35, 36 insulating portion 41 first region 42 second region 43, 43a third region 44 fourth region 45 Fifth Region 50 Auxiliary Layer 70, 70A, 70B, 70C, 70D, 70E, 70F, 70G, 70H Battery Outer Package 71, 71A, 71B, 71C, 71D, 71E, 71F, 71G, 71H First Film Portion 72, 72A, 72B, 72C, 72D, 72E, 72F, 72G, 72H Second Film Portion 75 Folding Position 81 First Opening 82 Second Opening 90 Heat - Sealing Portion 91, 91F, 92, 92F, 93 Adhesive Sealing Portion 100, 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H, 100I Battery 110, 110B Electrode Layer 111 Electrode Current Collector 112 Electrode Active Material Layer 120, 120C Counter - Electrode Layer 121 Counter - Electrode Current Collector 122 Counter - Electrode Active Material Layer 130 Solid Electrolyte Layer 150, 150A, 150B, 150C Battery Cell 161 Counter - Electrode Insulating Layer 162 Electrode Insulating Layer 171 Electrode Conductive Layer 172 Counter - Electrode Conductive Layer 200, 201 Power - Generation Element 210, 211, 220, 221 Main Surface 231, 241 Side Surface 290 Void 310, 311 Electrode Terminal 320, 321 Counter - Electrode Terminal 330 Insulating Layer 340, 340a, 340b, 340c Heat - Dissipation Auxiliary Body

Claims

1. A laminate film, A first resin film; a second resin film facing the first resin film; a first metal layer located between the first resin film and the second resin film; a second metal layer located between the first resin film and the second resin film, the first metal layer and the second metal layer are electrically insulated; The laminate film has, in a plan view, a first region in which the first metal layer is present and the second metal layer is absent; a second region where the first metal layer is absent and the second metal layer is present; Laminating film.

2. The thickness of the laminate film in the first region is the same as the thickness of the laminate film in the second region. The laminate film according to claim 1 .

3. an insulating layer located between the first metal layer and the second metal layer and electrically insulating the first metal layer from the second metal layer; The laminate film has a third region in which the first metal layer and the second metal layer are present in a plan view. The laminate film according to claim 1 .

4. The thickness of the laminate film in the first region is the same as the thickness of the laminate film in the third region. The laminate film according to claim 3 .

5. The heat resistance temperature of the insulating layer is higher than the heat resistance temperature of the first resin film. The laminate film according to claim 3 .

6. The insulating layer has a breaking strength higher than a breaking strength of the first resin film. The laminate film according to claim 3 .

7. Further comprising a bonding layer that bonds the insulating layer and the first metal layer. The laminate film according to claim 3 .

8. In a plan view, the area of ​​the third region is 50% or more of the area of ​​the laminate film. The laminate film according to claim 3 .

9. In a plan view, an area of ​​the third region is larger than an area of ​​the first region. The laminate film according to claim 3 .

10. an insulating portion located between the first metal layer and the second metal layer, electrically insulating the first metal layer from the second metal layer; In a plan view, the first metal layer and the second metal layer are spaced apart without overlapping with each other. The laminate film according to claim 1 .

11. an auxiliary layer that covers the insulating portion via the first resin film or the second resin film and overlaps at least a portion of the first metal layer and at least a portion of the second metal layer in a plan view; The laminate film according to claim 10.

12. a third metal layer located between the first resin film and the second resin film; one or more insulating layers are located between the first metal layer and the third metal layer and between the second metal layer and the third metal layer, electrically insulating the first metal layer and the third metal layer and electrically insulating the second metal layer and the third metal layer; The laminate film has, in a plan view, a third region in which the third metal layer is present and the first metal layer and the second metal layer are absent; a fourth region in which the first metal layer and the third metal layer are present and the second metal layer is absent; a fifth region in which the second metal layer and the third metal layer are present and the first metal layer is absent; the third metal layer is absent in the first region and the second region; The laminate film according to claim 1 .

13. A method for producing a laminate film, comprising the steps of: laminating a first resin film, a first metal layer, a second metal layer, and a second resin film, such that the second resin film faces the first resin film, the first metal layer and the second metal layer are positioned between the first resin film and the second resin film, and the first metal layer and the second metal layer are electrically insulated from each other; and integrating the first resin film, the first metal layer, the second metal layer, and the second resin film, In the lamination, the first resin film, the first metal layer, the second metal layer, and the second resin film are laminated so that, in a plan view, a first region in which the first metal layer is present and the second metal layer is not present, and a second region in which the first metal layer is not present and the second metal layer is present are formed in the laminate film. A method for manufacturing a laminate film.

14. the lamination includes laminating the first resin film, the first metal layer, the second metal layer, the second resin film, and an insulating layer between the first metal layer and the second metal layer, which electrically insulates the first metal layer and the second metal layer, so that the first region, the second region, and a third region in which the first metal layer and the second metal layer are present are formed in a plan view; The integrating step includes integrating the first resin film, the first metal layer, the insulating layer, the second metal layer, and the second resin film. A method for producing the laminate film according to claim 13.

15. forming an insulating portion located between the first metal layer and the second metal layer, electrically insulating the first metal layer and the second metal layer, and disposing the first metal layer and the second metal layer so as to be spaced apart without overlapping with each other in a plan view. A method for producing the laminate film according to claim 13.

16. A power generating element having an electrode layer and a counter electrode layer; One or more laminate films comprising the laminate film according to any one of claims 1 to 12 as a first laminate film; an electrode terminal electrically connected to the electrode layer; a counter electrode terminal electrically connected to the counter electrode layer; the one or more laminate films include a first film portion and a second film portion that face each other so as to sandwich the power generating element, the electrode terminal, and the counter electrode terminal, and seal the power generating element such that a portion of the electrode terminal and a portion of the counter electrode terminal are exposed; the first film portion is formed of at least a part of the first laminate film and is bonded to the electrode terminal in the first region; battery.

17. the electrode terminal is an electrode lead that is drawn out to the outside of the power generating element in a plan view, the counter electrode terminal is a counter electrode lead that is drawn out to the outside of the power generating element in a plan view, the electrode lead and the counter electrode lead are sandwiched between the first film portion and the second film portion and bonded to ends of the first film portion and the second film portion, respectively; 17. The battery of claim 16.

18. the electrode terminal is an electrode pad disposed on a main surface of the power generating element, the counter electrode terminal is a counter electrode pad disposed on a main surface of the power generating element, an opening for exposing a part of the electrode pad is formed in the first region of the first film portion; the first film portion is adhered to the electrode pad around the opening in the first region; 17. The battery of claim 16.

19. The electrode layer is electrically connected to the first metal layer.

17. The battery of claim 16.

20. Preparing one or more laminate films comprising the laminate film according to any one of claims 1 to 12 as a first laminate film; Providing a power generating element having an electrode layer and a counter electrode layer; preparing an electrode terminal electrically connected to the electrode layer and a counter electrode terminal electrically connected to the counter electrode layer; sandwiching the power generating element, the electrode terminal, and the counter electrode terminal between a first film portion and a second film portion that are mutually opposing portions of the one or more laminate films; and sealing the power generating element with the one or more laminate films so that a portion of the electrode terminal and a portion of the counter electrode terminal are exposed; The first film portion is composed of at least a portion of the first laminate film, In sealing the power generating element, the first film portion is adhered to the electrode terminal in the first region. How batteries are manufactured.

Images