JP2017041390A - Laminate exterior material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate exterior material in which resin layers are stuck to both surfaces of a metal foil, and a part of the resin layer can be easily removed.SOLUTION: In a laminate exterior material 1, a heat resistant resin layer 13 is stuck onto a first surface of a metal foil 11 through a first adhesive layer 12, a thermoplastic resin layer 15 is stuck onto a second surface thereof through a second adhesive 14, and easy-to-peel portions 21 and 23 surrounded by cutting lines 20 and 22 formed by cutting the resin layer are provided on at least one of the heat resistant resin layer 13 and the thermoplastic resin layer 15.SELECTED DRAWING: Figure 1C

Description

  The present invention relates to an exterior body for an electricity storage device, a laminate exterior material used for packaging materials for foods and pharmaceuticals, and related technologies.

  In recent years, with the reduction in thickness and weight of mobile devices such as smartphones and tablet terminals, the exterior material of lithium ion secondary batteries and lithium polymer secondary batteries mounted on these devices has been replaced with metal foil on both sides. A laminate material in which a resin film is bonded together is used. In addition, the use of a laminate material as an exterior material has also been studied in power sources for electric vehicles, large batteries for power storage, and capacitors.

  In general, laminated outer packaging materials are thinner and lighter than metal cans, are easy to form and seal, and easy to handle, but when used as a battery case, the metal surface is not exposed to the outside, so The exterior itself cannot be used as a conductor. For this reason, the positive electrode terminal and the negative electrode terminal subjected to insulation treatment are pulled out from the case and connected by soldering or the like, and the battery itself is often fixed to the substrate or the case with an adhesive tape or the like. Also, in applications other than battery cases, it is desired to expose a metal surface to a container package that can be efficiently heated by bringing jam or cooked food into contact with a heating element or sterilized by Joule heating.

  Since the laminate outer packaging material uses a metal foil in the center of the layer, if the metal foil can be exposed by removing the outer resin layer, this may be used as a conductor or a soldered part. .

  As a technology to cut only the resin layer without cutting the metal foil of the laminate exterior material, in a packaging bag that wraps food and medical equipment in a sealed state, the resin layer is cut by laser processing or mechanical processing with a metal blade. There is an easy-open packaging bag that can be opened with one hand (see Patent Document 1).

International Publication WO2009 / 090930

  Cited Document 1 is a technique for cutting a laminate outer packaging material in a cross-sectional direction to open a packaging bag, and cannot be applied to removing a resin layer and exposing a metal foil. Even if the resin layer is irradiated with a laser, only a linear cut is formed, and the resin layer cannot be removed in a planar shape to expose a metal foil having a solderable area. Further, it takes much time and effort to burn the resin layer into a planar shape so that the resin does not remain by reciprocating the laser.

  In view of the technical background described above, an object of the present invention is to provide a laminate exterior material in which a resin layer is bonded to both surfaces of a metal foil and a part of the resin layer can be easily removed.

  That is, this invention has the structure as described in following [1]-[5].

  [1] A heat-resistant resin layer is bonded to the first surface of the metal foil via a first adhesive layer, and a thermoplastic resin layer is bonded to the second surface via a second adhesive. A laminate exterior material, characterized in that at least one of a resin layer and a thermoplastic resin layer is provided with an easily peelable portion surrounded by a cut line formed by cutting the resin layer.

[2] The laminate exterior material according to [1], wherein a tab for a knob is attached to the easily peelable portion.
[3] In the adhesive layer between the resin layer having the easy-peeling part and the metal foil, the adhesive-unapplied part where the adhesive is not applied is provided immediately below the easy-peeling part or Item 3. Laminated outer packaging material according to item 2.
[4] The laminate exterior material for an electricity storage device according to the item 3, wherein an adhesive uncoated portion is formed on the second surface of the metal foil, and an active material is applied to the adhesive uncoated portion.

[5] A battery element having a positive electrode element, a negative electrode element, and a separator disposed therebetween,
Two laminate sheathing materials in which a heat-resistant resin layer is bonded to the first surface of the metal foil and a thermoplastic resin layer is bonded to the second surface face each other with the thermoplastic resin layer inside, and the battery A battery element chamber for housing the element, and an exterior body formed by fusing and sealing the thermoplastic resin layer,
The easy-release part that the laminate exterior material facing the battery element chamber of the laminate exterior material described in any one of the preceding items 1 to 4 is removed, and the easy-release part provided on the outer surface of the exterior body is removed. It is the exterior material that remains without being
In the battery element chamber, the metal foil of each laminate exterior material is electrically connected to the positive electrode element and the negative electrode element.

  According to the laminate exterior material described in [1] above, the easily peelable portion can be easily removed by the tear line formed in the resin layer, and the layer immediately below can be exposed. In addition, the layer immediately below can be protected by leaving the easy-peeling portion until the layer immediately below needs to be exposed.

  The electricity storage device according to the above [2] can easily remove the easy peeling portion provided on the outer surface of the exterior body.

  According to the laminate exterior material described in [3] above, the metal foil can be exposed by removing the easily peelable portion since the portion immediately below the easily peelable portion is the adhesive-uncoated portion.

  According to the laminate packaging material described in [4] above, the active material can be exposed by removing the easily peelable portion because the active material is directly under the easily peelable portion.

It is a top view of one embodiment of a laminate exterior material of the present invention. It is a bottom view of the laminate exterior material of FIG. 1A. It is the 1C-1C sectional view taken on the line of FIG. 1A. It is sectional drawing which shows the state which removed the easy peeling part of the laminate exterior material of FIG. 1A. It is sectional drawing of other embodiment of the laminate exterior material of this invention. It is sectional drawing of the electrical storage device using the laminate exterior material of FIG. 1A. It is sectional drawing of the electrical storage device using the laminate exterior material of FIG.

[Laminate exterior material]
1A to 1C show a laminate exterior material 1 according to an embodiment of the present invention.

  The laminate exterior material 1 has a heat-resistant resin layer 13 as an outer layer bonded to the first surface of the metal foil 11 via the first adhesive layer 12, and the second surface of the metal foil 11 is secondly bonded. It is a five-layer material in which a thermoplastic resin layer 15 serving as an inner layer is bonded via an adhesive layer 14.

  In the vicinity of the end of the surface on the heat resistant resin layer 13 side, an elongated rectangular easy peeling portion 21 surrounded by a cut line 20 is provided, and the easy peeling portion 21 from the center of the surface on the thermoplastic resin layer 15 side. A rectangular easily peelable portion 23 surrounded by a cut line 22 is provided at a position close to the side opposite to. The cut lines 20 and 22 are perforations in which cuts penetrating the heat-resistant resin layer 13 and the thermoplastic resin layer 15 are connected in a dotted manner.

  In the first adhesive layer 12, an adhesive unapplied portion 12 a to which no adhesive is applied is provided immediately below the easy-release portion 21. Similarly, in the second adhesive layer 14, an adhesive non-applied portion 14 a to which no adhesive is applied is provided immediately below the easily peelable portion 23. Therefore, the easy peeling portions 21 and 23 are not joined to the metal foil 11.

  As shown in FIG. 2, the laminate exterior material 1 can easily expose the underlying layer by removing the easy peeling portions 21 and 23. Immediately below the easily peelable portions 21 and 23 are the adhesive non-applied portions 12a and 14a, which are gaps, so that the removal of the easily peelable portions 21 and 23 exposes the metal foil 11 and the exposed metal foil exposed portions 24 and 25. It is formed. Since the easily peelable portions 21 and 23 are surrounded by the cut lines 20 and 22 and are not joined to the metal foil 11, the easily peelable portions 21 and 23 can be easily cut off to expose the metal foil 11. . Moreover, when using the laminate exterior material 1 as an exterior body of an electricity storage device, since the metal foil exposed portions 24 and 25 are used as the conductive portions, it is easy to prevent finger sebum from adhering to the metal foil exposed portions 24 and 25. It is preferable to remove the peeling portions 21 and 23 by pinching them with tweezers. It is also preferable to attach tabs for knobs to the easy peeling portions 21 and 23. By pulling the tabs, the easy peeling portions 21 and 23 can be easily removed without touching the metal foil exposed portions 24 and 25. Tabs can be made using tape or stickers with adhesive.

  In the laminated exterior material, whether the portion from which the resin layer is removed is required on the heat-resistant resin layer side surface or the thermoplastic resin layer side surface depends on the contents and the form of the exterior body. Therefore, the laminate outer packaging material of the present invention is required to have an easily peelable portion in at least one of the heat resistant resin layer and the thermoplastic resin layer. Moreover, the number of the easy peeling part formed in one resin layer is also arbitrary, and a shape and a dimension are not limited.

As described above, the easy peeling portions 21 and 23 can be removed at any time. Therefore, in the process of processing the laminate exterior material 1 into the exterior body, or the package using the exterior body, when the metal foil exposed portions 24 and 25 that are the resin layer removal portions are required, the easily peelable portions 21 and 23 Can be removed. The easy peeling portions 21 and 23 function as a protective layer for preventing corrosion and scratches on the metal foil exposed portions 24 and 25. In addition, the easily peelable portions 21 and 23 are resin layers that are indispensable as a constituent material of the laminate exterior material 1 and are portions that are discarded later.
[Other aspects of laminate exterior material]
In an electricity storage device, a metal foil of a laminate outer package may be used as an electrode. The laminate sheathing material 2 in FIG. 3 is a laminate sheathing material suitable for such applications, and an active material is applied to the adhesive-uncoated portion 14a on the thermoplastic resin layer 15 side that is the inner side of the electricity storage device, so that the active material portion 16 is formed. Is formed. The active material portion when the laminate outer packaging material 2 is a positive electrode member is a positive electrode active material portion, and the negative active material portion when the laminate outer packaging material 2 is a negative electrode member. A thermoplastic resin layer 15 is bonded around the active material portion 16 by a second adhesive layer 14. The cut line 22 is formed at a position corresponding to the active material part 16, and the active material part 16 immediately below is exposed by removing the easy peeling part 23. Since the second adhesive layer 14 does not exist between the easily peelable portion 23 and the active material portion 16 and both are in contact with each other, the easily peelable portion 16 can be easily removed. Further, the active material part 16 is exposed at the time of assembling the electricity storage device, and the easy peeling part 23 so far functions as a protective layer of the active material part 16.

  Note that FIG. 3 shows a state in which the dimension and position of the easy-peeling portion 23 and the active material portion 16 are completely coincident with each other. If the active material portion 16 can be exposed by removing the easily peelable portion 23, it can be used without any problem as a member for an electric storage device. Therefore, the thermoplastic resin layer 15 covers a part of the active material portion 16 after the easily peelable portion 23 is removed. There is no problem. The relationship between the easily peelable portions 21 and 23 and the adhesive-unapplied portions 12a and 14a in the laminate exterior material 1 of FIGS.

  On the other hand, the adhesive-unapplied portion 12a on the heat-resistant resin layer 13 side is a gap in order to expose the metal foil 11 and use it as a conductive portion, so that the metal foil 11 is exposed by removing the easily peelable portion 21. .

[Cut line]
The cut lines 20 and 22 are not limited to the perforations that penetrate the heat-resistant resin layer 13 or the thermoplastic resin layer 15. As another cut line, a notch cut in the middle of the thickness of the resin layer can be exemplified. The notch may be a single line or a dotted line with a short notch being continuous. In addition, even if the easy-peeling portion is completely cut, the cut line is included in the cut line in the present invention as long as it is attracted to the metal foil by static electricity or the like and remains in the laminate exterior material. Further, in order to keep the cut easily peeled portion on the layer immediately below, it may be secured to the resin layer with an adhesive tape or the like.

[Manufacturing method of laminate exterior material]
1A to 1C, that is, the laminate exterior material 1 having the void-adhesive unapplied portions 12a and 14a can be produced, for example, by the following method.

The metal foil 11 and the heat resistant resin layer 13 are bonded together by the first adhesive layer 12 in the following steps.
(1) An adhesive to be the first adhesive layer 12 is applied to the first surface of the metal foil 11. At this time, after applying while forming the adhesive unapplied portion 12a to which the adhesive is not applied using a gravure roll or masking having irregularities on the surface,
The metal foil 11 and the heat resistant resin layer 13 are bonded together and subjected to an aging treatment.
(2) A tear line 20 is formed in the heat-resistant resin layer 13 along the periphery of the adhesive-unapplied portion 12 to form an easily peelable portion 21. The cut line 20 is formed by cutting the heat resistant resin layer 13 with a tool such as a Thomson blade or a pinnacle blade, a laser cutter, a hot knife, or the like.
(3) After applying an adhesive to be the second adhesive layer 14 while forming the adhesive non-applied portion 14a on the second surface of the metal foil 11 by the same method as described above, the metal foil 11 and heat The plastic resin layer 15 is bonded and an aging process is performed.
(4) The tear line 22 is formed in the thermoplastic resin layer 15 by the same method as described above to form the easy peeling portion 23.

The laminate exterior material 2 having the active material portion 16 of FIG. 2 can be produced by, for example, the following method.
(1) A binder is applied to the second surface of the metal foil 11 at a required position, and an active material prepared in a paste form is coated thereon to form the active material portion 16.
(2) Curing is performed so that the active material portion 16 is not affected, and the heat-resistant resin layer 13 is bonded by the same method as the exterior material 1 and subjected to an aging treatment.
(3) The easy-to-peel portion 21 is formed by forming the cut line 20 by the same method as the exterior material 1.
(4) The curing of (2) was removed, and an adhesive to be the second adhesive layer 14 was applied around the active material portion 16 formed in (1) using a gravure roll or masking having irregularities on the surface. Thereafter, the metal foil 11 and the thermoplastic resin layer 15 are bonded together and subjected to an aging treatment. By this step, the adhesive unapplied portion 14a where the adhesive is not substantially applied to the metal foil 11 is formed, and the active material portion 16 is further formed in the adhesive unapplied portion 14a.
(5) The tear line 22 is formed in the thermoplastic resin layer 15 to form the easy peeling portion 23.

  The manufacturing method of the laminated exterior material of this invention is not limited to said method. Further, the present invention is not limited to the formation of the cut line after bonding, and the present invention is also realized by forming the cut line on the resin layer before bonding and bonding the resin layer on which the cut line is formed and the metal foil. The laminate outer packaging material of the invention can be produced.

Further, the laminate exterior material 2 can also be produced from the laminate exterior 1. That is, first, as shown in FIG. 2, the easy peeling part 23 of the laminate outer packaging material 1 is peeled off to make the metal foil exposed part 25 appear. And the form of the laminate exterior material 2 is obtained by applying an active material as the active material portion 16 to the exposed metal foil portion 25.
[Power storage device]
4 and 5 show two types of power storage devices 3 and 4 in which the exterior bodies 30 and 31 are made of the laminate exterior materials 1 and 2. These power storage devices 3 and 4 are devices that do not have a tab lead and transfer electricity by using the metal foil 11 of the laminate outer packaging materials 1 and 2 as an electrical conduction portion.

3 and 4, illustration of the first adhesive layer 12 and the second adhesive layer 14 of the laminate exterior materials 1 and 2 is omitted.
(First power storage device)
In the electricity storage device 3 of FIG. 4, the exterior body 30 includes a main body 40 having a recess and a flat lid body 50 that covers the main body 40, and each is manufactured using the laminate exterior material 1.

  The main body 40 forms a concave portion 41 having a rectangular shape as a battery element chamber 60 by subjecting the flat sheet laminate exterior material 1 to processing such as overhanging or drawing, and has four opening edges on the concave portion 41. And a flange 42 extending substantially horizontally outward. A first inner conductive portion 43 where the metal foil 11 is exposed is formed on the inner side of the bottom wall of the recess 41, that is, on the surface on the thermoplastic resin layer 15 side. Further, the easily peelable portion 21 is provided on the outer surface of one of the four side flanges 42, that is, the heat resistant resin layer 13.

  The lid 50 is the same as the planar dimension of the main body 40, and the metal foil 11 is placed in a position facing the first inner conducting portion 43 in the battery element chamber 60 during assembly, that is, on the surface on the thermoplastic resin layer 15 side. An exposed second inner conducting portion 51 is formed. Further, an easily peelable portion 21 is provided on a surface on the heat resistant resin layer 13 side which is an outer surface of the lid 50.

  The battery element 70 is a laminate in which a separator 73 is disposed between a positive foil 71 and a negative foil 72 and wound and laminated.

  The power storage device 3 connects the end of the positive foil 71 of the battery element 70 to the first inner conductive portion 43 of the main body 40 via the conductive binder 74 and also connects to the second inner conductive portion 51 of the lid 50. It is manufactured by connecting the end of the negative electrode foil 72 through the conductive binder 74, injecting an electrolyte, and heat-sealing the periphery of the battery element chamber 60 to form the heat-sealed portion 61.

  In the electricity storage device 3, the first outer conductive portion 44 where the metal foil 11 is exposed is formed by removing the easy peeling portion 21 of the main body 40, and the metal foil is removed by removing the easy peeling portion 21 of the lid 50. A second outer conductive portion 52 where 11 is exposed is formed.

  In the battery element chamber 60, the metal part of the positive foil 71 is electrically connected to the 40 metal foil 11 of the main body by the first inner conductive part 43 in the battery element chamber 60, and the first outer conductive part 44 is provided on the outer surface of the exterior body 30. To get continuity with the outside. Similarly, in the battery element chamber 60, the metal portion of the negative electrode foil 72 is electrically connected to the metal foil 11 of the lid 50 by the second inner conductive portion 51, and the second outer conductive portion 52 is externally provided on the outer surface of the exterior body 30. Get continuity with. The electricity storage device 1 transmits and receives electricity through the first outer conductive portion 44 and the second outer conductive portion 52 provided in the exterior body 30.

  The first inner conducting portion 43 of the main body 40 is a metal foil exposed portion formed by removing the easy peeling portion 23 provided on the thermoplastic resin layer 15 of the laminate exterior material 1. The main body 40 is formed by forming a recess 41 from a flat sheet laminate outer packaging material 1 by molding and adjusting the dimensions of the flange 42 by trimming. The first inner conductive portion 43 is required when the conductive binder 74 is applied, and the metal foil 11 does not need to be exposed in the step of forming or trimming the concave portion 41. Therefore, the easy peeling part 23 should just be removed just before coating, and the exposed exposure part of the metal foil 11 can be protected by leaving the easy peeling part 23 without removing in the process of forming or trimming the recess 41. . On the other hand, the first outer conductive portion 44 is required for energization. In addition to the steps of forming and trimming the recess 41, the battery element 70 is loaded, the body 40 and the lid 50 are assembled, and heat sealing is performed. The metal foil 11 does not need to be exposed when the portion 61 is formed. Therefore, the easy peeling part 21 should just be removed just before electricity supply, and until then, the easy peeling part 21 covers the 1st outer side conduction | electrical_connection part 44 and the 2nd outer side conduction | electrical_connection part 52, and protects the exposure plan part of the metal foil 11. FIG. ing.

The same applies to the lid 50, and the second inner conducting portion 51 protects the exposed portion of the metal foil 11 by leaving the easy peeling portion 23 until the conductive binder 74 is applied, and the second outer conducting portion 51 is protected. The conducting part 52 can protect the expected exposed part of the metal foil 11 by leaving the easy peeling part 21 until energization.
(Second power storage device)
The power storage device 4 of FIG. 5 is a thin device in which the exterior body 31 is configured by two flat laminate exterior materials 2 and each metal foil 11 is used as a positive electrode and a negative electrode.

  The two laminate outer packaging materials 2 are disposed with the thermoplastic resin layers 15 facing each other. In the drawing, a positive electrode active material portion 76 is formed as an active material portion 16 on the surface on the thermoplastic resin layer 15 side of the laminate exterior material 2 arranged on the upper side. Further, an easily peelable portion 21 is provided in the vicinity of one side of the surface on the heat resistant resin layer 13 side. By removing the easy peeling 21, the first outer conductive portion 103 where the metal foil 11 is exposed is formed. On the other hand, a negative electrode active material portion 77 is formed as an active material portion 16 on the surface of the laminate exterior material 2 disposed on the lower side in the drawing on the thermoplastic resin layer 15 side. Further, an easily peelable portion 21 is provided in the vicinity of the end portion of the opposite side of the first outer conductive portion 103 on the surface on the heat resistant resin layer 13 side. By removing the easily peelable portion 21, a second outer conductive portion 105 where the metal foil 11 is exposed is formed.

  The electricity storage device 4 is manufactured by sandwiching the separator 73 between the positive electrode active material portion 76 and the negative electrode active material portion 77 of the two laminate outer packaging materials 2 and heat-sealing with the thermoplastic resin layer 15 together with the electrolyte. Yes. In FIG. 5, reference numeral 63 denotes a heat sealing portion. The positive electrode active material portion 76 and the negative electrode active material portion 77 correspond to the positive electrode element and the negative electrode element in the present invention, and the positive electrode active material portion 76, the negative electrode active material portion 77, and the separator 73 are the battery elements 75. A space where the electrode element 75 exists is a battery element chamber 62.

  The electricity storage device 4 transmits and receives electricity at the first outer conductive portion 103 and the second outer conductive portion 105 on the outer surface of the exterior body 31.

  The positive electrode active material portion 76 and the negative electrode active material portion 77 are exposed by removing the easy peeling portion 23 provided on the thermoplastic resin layer 15 of the laminate outer packaging material 2 of FIG. Since the positive electrode active material portion 76 and the negative electrode active material portion 77 do not need to be exposed until the power storage device 4 is assembled together with the separator 73, the positive electrode active material portion 76 is left by leaving the easily peelable portion 23 until then. In addition, the negative electrode active material portion 77 can be protected. On the other hand, the first outer conducting portion 103 and the second outer conducting portion 105 are required when energizing, and the metal foil 11 does not need to be exposed during assembly. Therefore, the easy peeling part 21 should just be removed just before electricity supply, and the easy peeling part 21 has covered the metal foil 11 and protected the metal foil 11 until then.

  As described above, in the completed electricity storage devices 3 and 4, the easy peeling portion 23 facing the battery element chambers 60 and 62 has been removed, but preparation of assembly of the conductive binder 74 (see FIG. 4) or the like in the manufacturing process is performed. By leaving the easily peelable portion 23 without removing it until assembly, the metal foil 11, the positive electrode active material portion 76, and the negative electrode active material portion 77 can be protected from scratches, corrosion, and the like. On the other hand, on the outer surfaces of the exterior bodies 30 and 31, the first outer conductive portions 44 and 103 and the second outer conductive portions conductive portions 52 and 105 are left without removing the easy peeling portion 21 until energization. 11 can be protected from scratches and corrosion. Since the easy peeling portions 21 and 23 are surrounded by the cut lines 20 and 22, they can be easily removed.

  Moreover, although the said electrical storage device 4 showed the example which created the 2nd electrical storage device using the laminate exterior material 2, after peeling off the easy peeling part 23 of the laminate exterior material 1 and making the metal foil exposed part 15 appear, By applying an active material as the active material portion 16 to the metal exposed portion 15, an exterior material equivalent to the laminate exterior material 2 can be produced.

  The use of the laminate exterior material of the present invention is not limited to the electricity storage device, and the electricity storage device is not limited to the form shown in FIGS. The surface and the number of the easily peelable portions vary depending on the use of the laminate sheathing material, and the laminate sheathing material of the present invention requires that at least one of the heat resistant resin layer and the thermoplastic resin layer has the easily peelable portion. And

  A food container can be illustrated as an application of a laminate outer material in which an easily peelable portion is provided only on a heat resistant resin layer. A metal foil exposed part is formed on the heat-resistant resin layer on the outer surface of the food container, and a heating element is brought into contact with this metal foil exposed part to heat the contents such as food and liquid, or the contents of food and liquid, etc. It is possible to sterilize by Joule heat by passing electricity directly through the object, and to produce a food container capable of these. In an electricity storage device in which a metal foil exposed portion is provided only on the outer surface of the outer package, that is, an outer package that does not use the metal foil of the laminate outer package as a conductor, it can be used as a soldered portion to a substrate or a casing.

Moreover, when utilizing the metal foil of a laminate exterior material as a conduction | electrical_connection part of an electrical storage device, it is not limited to the conduction | electrical_connection part of the outer surface of an exterior body being provided in the surface at the side of a heat resistant resin layer. Since the thermoplastic resin layer is exposed on the outer surface of the exterior body when the end portions of the two laminated exterior materials are shifted and overlapped, the outer conductive portion can be provided on the surface on the thermoplastic resin layer side. On the other hand, the inner conductive portion facing the battery element chamber must be provided on the surface on the thermoplastic resin layer side. Therefore, the laminate exterior material used for the exterior body of the electricity storage device without tab leads is provided with an easily peelable portion on both the heat-resistant resin layer side surface and the thermoplastic resin layer side surface, or on the thermoplastic resin side surface. The condition is that a plurality of easily peelable portions are provided on the surface.
[Constituent materials for laminate exterior materials and electricity storage devices]
Although this invention does not limit the material of a laminate exterior material, the following materials can be mentioned as a preferable material.
(Metal foil)
The metal foil 11 plays a role of imparting a gas barrier property to the laminate exterior materials 1 and 2 to prevent oxygen and moisture from entering. Moreover, when utilizing the metal foil 11 as a conduction | electrical_connection part, metal foil with favorable electroconductivity is used. For example, an aluminum foil, a copper foil, a nickel foil, a stainless steel foil, or a clad foil thereof, an annealed foil or an unannealed foil thereof can be used. It is also preferable to use a metal foil plated with a conductive metal such as nickel, tin, copper, or chromium, for example, a plated aluminum foil. The thickness of the metal foil 11 is preferably 7 to 150 μm.

The metal foil 11 is preferably formed with a chemical conversion film. The chemical conversion film is a film formed by performing a chemical conversion treatment on the surface of the metal foil, and by performing such chemical conversion treatment, corrosion of the metal foil surface by the contents (electrolytic solution, etc.) is caused. Can be sufficiently prevented. For example, the chemical conversion treatment is performed on the metal foil by performing the following treatment. That is, on the surface of the metal foil that has been degreased,
1) phosphoric acid;
Chromic acid,
An aqueous solution of a mixture comprising at least one compound selected from the group consisting of a metal salt of fluoride and a non-metal salt of fluoride; 2) phosphoric acid;
At least one resin selected from the group consisting of acrylic resins, chitosan derivative resins and phenolic resins;
An aqueous solution of a mixture comprising at least one compound selected from the group consisting of chromic acid and a chromium (III) salt, 3) phosphoric acid,
At least one resin selected from the group consisting of acrylic resins, chitosan derivative resins and phenolic resins;
At least one compound selected from the group consisting of chromic acid and a chromium (III) salt;
An aqueous solution of a mixture comprising at least one compound selected from the group consisting of a metal salt of fluoride and a nonmetal salt of fluoride, and coating the surface of the metal foil with any one of the above aqueous solutions 1) to 3) After the process, chemical conversion treatment is performed by drying.

The conversion coating, chromium coating weight preferably is 0.1mg ^{/ m 2} ~50mg ^/ m 2 as a (per one surface), in particular ^2mg / ^{m 2 ~20mg} / m ² preferred.
(Heat resistant resin layer)
As the heat resistant resin constituting the heat resistant resin layer 13, a heat resistant resin that does not melt at the heat sealing temperature at the time of heat sealing is used. As the heat resistant resin, it is preferable to use a heat resistant resin having a melting point higher by 10 ° C. or higher than the melting point of the thermoplastic resin constituting the thermoplastic resin layer 15, and having a melting point higher by 20 ° C. or higher than the melting point of the thermoplastic resin. It is particularly preferable to use a heat resistant resin having the same. For example, it is preferable to use a stretched polyamide film (stretched nylon film or the like) or a stretched polyester film. Among them, a biaxially stretched polyamide film (such as a biaxially stretched nylon film), a biaxially stretched polybutylene terephthalate (PBT) film, a biaxially stretched polyethylene terephthalate (PET) film, or a biaxially stretched polyethylene naphthalate (PEN) film is used. Is particularly preferred. The heat-resistant resin layer 13 may be formed as a single layer or, for example, a multilayer composed of a stretched polyester film / stretched polyamide film (a multilayer composed of a stretched PET film / stretched nylon film). May be. The thickness of the heat-resistant resin layer 13 is preferably 20 μm to 100 μm.

Moreover, the adhesive which comprises the 1st adhesive bond layer 12 which bonds the said heat resistant resin layer 13 uses the at least 1 sort (s) of adhesive chosen from the group which consists of a polyester urethane type adhesive agent and a polyether urethane type adhesive agent. Is preferred. The thickness of the first adhesive layer 12 is preferably set to 0.5 μm to 5 μm.
(Thermoplastic resin layer)
The thermoplastic resin constituting the thermoplastic resin layer 15 is an unstretched film made of at least one thermoplastic resin selected from the group consisting of polyethylene, polypropylene, olefin copolymers, acid-modified products thereof, and ionomers. Preferably it is configured. The thickness of the thermoplastic resin layer 15 is preferably set to 20 μm to 150 μm.

Moreover, it is preferable that the adhesive which comprises the 2nd adhesive bond layer 14 which bonds the said thermoplastic resin layer 15 is a layer formed with the fin type adhesive. In the case of using a two-component curable olefin adhesive, it is possible to sufficiently prevent the adhesiveness from being lowered due to swelling by the electrolytic solution. The thickness of the second adhesive layer 14 is preferably set to 0.5 μm to 5 μm.
(Battery element)
In the battery element 70, the positive side metal foil 71 is preferably a hard or soft aluminum foil having a thickness of 7 to 50 μm, and the negative side metal foil 72 is preferably a copper foil having a thickness of 7 to 50 μm. Aluminum foil, titanium foil, and stainless steel foil can be used. Further, as the separator 73, a polyethylene separator, a polypropylene separator, a separator formed of a multilayer film composed of a polyethylene film and a polypropylene film, or a wet or dry type in which a heat resistant inorganic material such as ceramic is applied to a resin separator thereof. And separators composed of a porous film. The thickness of the separator 73 is preferably set to 5 μm to 50 μm.

  In the battery element 75, the positive electrode active material portion 76 is made of, for example, a salt (on a binder such as PVDF (polyvinylidene fluoride), SBR (styrene butadiene rubber), CMC (carboxymethylcellulose sodium salt), PAN (polyacrylonitrile)). For example, it is formed of a mixed composition to which lithium cobaltate, lithium nickelate, lithium iron phosphate, lithium manganate, etc.) are added. The thickness of the positive electrode active material portion 76 is preferably set to 2 μm to 300 μm. Furthermore, the positive electrode active material portion 76 may contain a conductive auxiliary agent such as carbon black or CNT (carbon nanotube). Further, as the negative electrode active material portion 77, for example, a mixed composition in which an additive (eg, graphite, lithium titanate, Si-based alloy, tin-based alloy, etc.) is added to a binder such as PVDF, SBR, CMC, PAN, etc. Formed with. The thickness of the negative electrode active material portion 77 is preferably set to 1 μm to 300 μm. Furthermore, the negative electrode active material portion 77 may contain a conductive auxiliary agent such as carbon black or CNT (carbon nanotube).

  In any type of battery elements 70 and 75, as the separator 73, a polyethylene separator, a polypropylene separator, a separator formed of a multilayer film composed of a polyethylene film and a polypropylene film, or a resin separator thereof. A separator composed of a wet or dry porous film coated with a heat-resistant inorganic material such as ceramic is preferably used.

  The laminate exterior material of the present invention can be suitably used as an exterior body material in which a part of the resin layer is removed to expose the metal foil.

DESCRIPTION OF SYMBOLS 1, 2 ... Laminate cladding | exterior_material 3, 4 ... Power storage device 11 ... Metal foil 12 ... 1st adhesive layer 12a, 14a ... Adhesive non-application part 13 ... Heat resistant resin layer 14 ... 2nd adhesive layer 15 ... Thermoplastic Resin layer 16 ... Active material part 20, 22 ... Cut line 21, 23 ... Easy peeling part 24, 25 ... Metal foil exposed part 30, 31 ... Exterior body 40 ... Main body (laminate exterior material)
43, 100 ... first inner conducting portion 44, 103 ... first outer conducting portion 50 ... lid (laminate exterior material)
51, 101 ... second inner conducting portion 52, 105 ... second outer conducting portion 60, 62 ... battery element chamber 61, 63 ... heat sealing portion 70, 75 ... battery element 71 ... positive electrode foil (positive electrode element)
72 ... Negative electrode foil (negative electrode element)
73 ... Separator 76 ... Positive electrode active material part (positive electrode element)
77 ... Negative electrode active material part (negative electrode element)

Claims (5)

  A heat-resistant resin layer is bonded to the first surface of the metal foil via a first adhesive layer, a thermoplastic resin layer is bonded to the second surface via a second adhesive, and the heat-resistant resin layer and A laminate exterior material characterized in that at least one of the thermoplastic resin layers is provided with an easily peelable portion surrounded by a cut line formed by cutting the resin layer.   The laminate exterior material according to claim 1, wherein a tab for a knob is attached to the easily peelable portion.   The adhesive layer between the resin layer having the easily peelable portion and the metal foil is provided with an adhesive non-applied portion where no adhesive is applied immediately below the easily peelable portion. The laminate exterior material described in 1.   The laminate outer packaging material for an electricity storage device according to claim 3, wherein an adhesive uncoated portion is formed on the second surface of the metal foil, and an active material is applied to the adhesive uncoated portion. A battery element having a positive electrode element, a negative electrode element, and a separator disposed therebetween,
Two laminate sheathing materials in which a heat-resistant resin layer is bonded to the first surface of the metal foil and a thermoplastic resin layer is bonded to the second surface face each other with the thermoplastic resin layer inside, and the battery A battery element chamber for housing the element, and an exterior body formed by fusing and sealing the thermoplastic resin layer,
The easily peelable portion provided on the outer surface of the exterior body is removed by removing the easily peelable portion facing the battery element chamber of the laminate exterior material according to any one of claims 1 to 4. It is the exterior material that remains without being removed,
In the battery element chamber, the metal foil of each laminate exterior material is electrically connected to the positive electrode element and the negative electrode element.

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