TW201709589A - Lamination sheathing material and power storage device characterized by easily removing detachable portions through cutting lines formed due to cutting a resin layer - Google Patents

Abstract

A Lamination sheathing material 1 is provided. It is characterized in that a first surface of a metal foil 11 adheres to a heat resistant resin layer 13 via a first adhesion agent layer 12, and a second surface adheres to a thermoplastic resin layer 15 via a second adhesion agent layer 14. On at least one of the heat resistant resin layer 13 and the thermoplastic resin layer 15 are disposed detachable portions 21, 23 surrounded by cutting lines 20, 22 formed due to cutting the resin layer.

Description

Laminated exterior material and power storage device

The present invention relates to a laminated exterior material for a packaging material for an electrical storage device, a food or a pharmaceutical product, and a related art thereof.

In recent years, with the thinner and lighter weight of portable devices such as smart phones and tablet terminals, lithium ion batteries or lithium polymer batteries, which are mounted on these devices, are currently being used on both sides of metal foil. A laminate of films to replace traditional metal cans. In addition, it is also being studied to use a laminate as an exterior material even in a large battery or capacitor for electric power or electric storage.

In general, a laminated exterior material is thinner, lighter, and easier to form and seal than a metal can. However, when used as a battery casing, since the metal surface is not exposed to the outside, it cannot be as Dry batteries generally use the outer body directly as a conductor. Therefore, the positive electrode terminal and the negative electrode terminal which have been subjected to the insulating treatment from the inside of the casing are extracted, and are connected by welding or the like, and the battery body is fixed to the substrate or the casing by using an adhesive tape or the like. Further, in applications other than the battery casing, it is also desirable to make the jam or the finished food contact with the heating element to be effectively warmed, and to expose the metal surface to the container package which can be sterilized by Joule heating.

Since the laminated exterior material uses metal foil in the center of the layer, if it can be used When the metal foil is exposed except for the resin layer on the outer side, it may be used as a conductor or a welded portion.

A technique in which a metal foil of a laminated exterior material is not cut and only a resin layer is cut off, and in a packaging bag in which a food or medical device is packaged in a sealed state, there is a (exposure disclosed) that a laser processing or a metal knife is used for the resin layer. The incision is placed in a machined manner to obtain an easy-open packaging bag that can be opened with one hand (refer to Patent Document 1).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] International Publication WO2009/090930

Citation 1 is a technique in which the cross-sectional direction of the laminated exterior material is cut and the packaging bag is unsealed, and it is not suitable for removing the resin layer to expose the metal foil. Even if the resin layer is irradiated with a laser, only a linear slit is formed, and the resin layer is removed in a planar shape, and the metal foil of the weldable area is exposed. Further, it is quite time-consuming and labor-intensive to irradiate the laser back and forth to ensure that the resin is not left to be burnt and the resin layer is blown in a planar manner.

The present invention has been made in view of the above technical background, and aims to provide a laminated exterior The material is bonded to the resin layer on both sides of the metal foil, and a part of the resin layer can be easily removed.

That is, the present invention has the constitutions described in the following [1] to [5].

[1] A laminated exterior material characterized in that a first adhesive layer is bonded to a heat resistant resin layer on a first side of the metal foil, and a second adhesive layer and a thermoplastic resin are bonded on the second surface. At least one of the heat resistant resin layer and the thermoplastic resin layer is provided with an easily peelable portion surrounded by a tangential line formed by cutting the resin layer.

[2] The laminated exterior material according to the above item 1, wherein the detachable tab is provided with a nip for holding.

[3] The laminated exterior material according to the above item 1 or 2, wherein the adhesive layer between the resin layer having the easy-peelable portion and the metal foil is provided directly under the easy-peeling portion The adhesive uncoated portion of the adhesive is not applied.

[4] The laminated exterior material for a storage device according to the above-mentioned 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 uncoated portion of the adhesive. By.

[5] A power storage device comprising: a battery element including a positive electrode element, a negative electrode element, and a separator disposed therebetween; and a first surface of the metal foil bonded to the heat resistant resin layer and second The thermoplastic resin layer of the two laminated exterior materials of the thermoplastic resin layer is placed facing the inside and facing each other; and the battery element chamber of the battery element is accommodated between the two, by melting the thermoplastic resin The laminated outer casing is formed by sealing the layered outer casing; and the laminated outer covering material is removed from the outer surface of the battery element chamber of the laminated outer covering material according to the first aspect, and the outer surface of the outer casing is not removed. The outer part of the easy peeling part is set; In the battery element chamber, the metal foil of the individual laminated exterior materials and the positive electrode element and the negative electrode element are electrically connected.

According to the laminated exterior material of the above [1], the easily peelable portion can be easily removed by the tangent formed on the resin layer, and the layer directly under the layer can be exposed. In addition, the layer immediately below can be protected by retaining the easily peelable portion until the layer immediately below is exposed.

According to the laminated exterior material described in the above [2], the easily peelable portion provided on the outer surface of the outer casing can be easily removed.

According to the laminated exterior material of the above [3], since the adhesive-free portion is directly under the easily peelable portion, the metal foil can be exposed by removing the easily peelable portion.

According to the laminated exterior material of the above [4], since the active material is directly under the easily peelable portion, the active material can be exposed by removing the easily peelable portion.

According to the electric storage device of the above [5], since the easily peelable portion on the outer surface of the outer casing is not removed, the metal foil can be protected from scratches or corrosion. Further, since the aforementioned easily peelable portion is surrounded by a tangential line, it is easy to remove. Further, the metal foil exposed by the removal of the easily peelable portion can be used as a conductive portion.

1, 2‧‧‧ laminated exterior materials

3, 4‧‧‧ power storage devices

11‧‧‧metal foil

12‧‧‧First adhesive layer

12a, 14a‧‧‧Adhesive uncoated part

13‧‧‧Heat resistant resin layer

14‧‧‧second adhesive layer

15‧‧‧ thermoplastic resin layer

16‧‧‧Active Materials Division

20, 22‧‧ ‧ tangent

21, 23‧‧‧Easy stripping department

24, 25‧‧‧ metal foil exposed

30, 31‧‧‧ Exterior body

40‧‧‧ Body (laminated exterior)

43,100‧‧‧First inner conduction

44, 103‧‧‧ first lateral conduction

50‧‧‧ cover (laminated exterior)

51, 101‧‧‧Second inner conduction

52, 105‧‧‧ second lateral conduction

60, 62‧‧‧ battery element room

61, 63‧ ‧ heat seal

70, 75‧‧‧ battery elements

71‧‧‧positive foil (positive element)

72‧‧‧Negative foil (negative element)

73‧‧‧Baffle

76‧‧‧positive active material part (positive element)

77‧‧‧Negative active material part (negative element)

Fig. 1A is a plan view showing an embodiment of a laminated exterior material of the present invention.

1B is a bottom view of the laminated exterior material of FIG. 1A.

Fig. 1C is a cross-sectional view taken along line 1C-1C of Fig. 1A.

Fig. 2 is a cross-sectional view showing a state in which the easily peelable portion of the laminated exterior material of Fig. 1A is removed.

Fig. 3 is a cross-sectional view showing another embodiment of the laminated exterior material of the present invention.

Fig. 4 is a cross-sectional view showing a power storage device using the laminated exterior material of Fig. 1A.

Fig. 5 is a cross-sectional view showing a power storage device using the laminated exterior material of Fig. 3.

[Laminated exterior material]

1A to 1C show a laminated exterior material 1 according to an embodiment of the present invention.

The laminated exterior material 1 is bonded to the first surface of the metal foil 11 via the first adhesive layer 12 and the heat resistant resin layer 13 as the outer layer, and the second side of the metal foil 11 is interposed. The second laminate layer 14 is bonded to the thermoplastic resin layer 15 as the inner layer.

In the vicinity of the end portion of the surface on the side of the heat-resistant resin layer 13, an elongate rectangular easily peelable portion 21 surrounded by a tangential line 20 is provided, and the center of the surface from the side of the thermoplastic resin layer 15 is close to the easily peelable portion 21 A rectangular peelable portion 23 surrounded by a tangent 22 is provided at a position on the side of the side. The tangent lines 20 and 22 are individually connected by a slit penetrating the heat resistant resin layer 13 and the thermoplastic resin layer 15 in a dot shape to form a perforation line.

In the first adhesive layer 12, an adhesive uncoated portion 12a to which an adhesive is not applied is provided directly under the easily peelable portion 21. Similarly, in the second adhesive layer 14, an adhesive which is not coated with an adhesive is disposed directly under the easy-peel portion 23 Cloth portion 14a. Therefore, the easily peelable portions 21, 23 are not joined to the metal foil 11.

As shown in Fig. 2, the laminated exterior material 1 can be easily exposed by removing the easily peelable portions 21 and 23. Since the adhesive uncoated portions 12a and 14a are directly under the easy-peelable portions 21 and 23 and are voids, the metal foil 11 can be exposed by the removal of the easily peelable portions 21 and 23, thereby forming a metal foil exposed portion. 24, 25. Since the easily peelable portions 21, 23 are surrounded by the tangents 20, 22 and are not joined to the metal foil 11, the easily peelable portions 21, 23 can be easily cut by drawing, thereby exposing the metal foil 11. Further, when the laminated exterior material 1 is used as an external storage device, since the metal foil exposed portions 24 and 25 are used as the conductive portions, it is preferable to sandwich and remove the easily peelable portions 21 and 23 by the tweezers. Thereby, the sebum of the finger is prevented from adhering to the metal foil exposed portions 24, 25. Further, it is preferable that the easy-peelable portions 21, 23 are provided with the holding tabs, and the drawing tabs can easily cut the easily peelable portions 21, 23 without contacting the metal foil exposed portions 24, 25. The tabs can be made from tape or seals with adhesive.

In the laminated exterior material, it is necessary to remove the resin layer portion on either the heat-resistant resin layer side surface or the thermoplastic resin layer side surface depending on the form of the content or the exterior body. Therefore, the laminated exterior material of the present invention has a condition that at least one of the heat resistant resin layer and the thermoplastic resin layer has an easily peelable portion. Further, the number of easily peelable portions formed by one of the resin layers is arbitrary, and the shape or size is not limited.

As described above, the easily peelable portions 21, 23 can be removed at any time. Therefore, in the step of processing the laminated exterior material 1 as an exterior body, or in the package body using the exterior body, the easily peelable portion 21 is removed when the metal foil exposed portions 24, 25 of the resin layer removal portion are necessary, 23 can be. The easy-peeling portions 21 and 23 have the metal foil exposed portion 24 as 25 The function of the protective layer of corrosion or damage. Further, the easily peelable portions 21 and 23 are laminated with a resin layer which is indispensable in the constituent material of the exterior material 1, and is a portion which is discarded later, so that it is not costly.

[Other states of laminated exterior materials]

In the electricity storage device, the metal foil of the laminated outer casing is used as an electrode. The laminated exterior material 2 of FIG. 3 is a laminate exterior material suitable for such a related application, and an active material is formed on the adhesive uncoated portion 14a on the side of the thermoplastic resin layer 15 on the inner side of the electricity storage device. Active material portion 16. When the laminated exterior material 2 is a positive electrode member, the active material portion is a positive electrode active material portion, and when the negative electrode member is a negative electrode active material portion. The periphery of the active material portion 16 is bonded to the thermoplastic resin layer 15 by the second adhesive layer 14. The tangent line 22 is formed at a corresponding position of the active material portion 16, and the active material portion 16 directly under is exposed by removing the easily peelable portion 23. The second adhesive layer 14 does not exist between the easily peelable portion 23 and the active material portion 16, and the two are in contact with each other only, so that the easily peelable portion 16 can be easily removed. In addition, when the active material portion 16 is exposed to the combined power storage device, the easily peelable portion 23 functions as a protective layer of the active material portion 16 before.

Further, although FIG. 3 shows a state in which the size and position of the easily peelable portion 23 and the active material portion 16 are completely identical, it is not essential for the present invention to completely match the above. As long as the active material portion 16 can be exposed by the removal of the easily peelable portion 23, it can be used as a power storage device member without any hindrance. Therefore, even if the easily peelable portion 23 is removed, a part of the active material portion 16 is made of a thermoplastic resin. The layer 15 is also unobstructed. The relationship between the easily peelable portions 21 and 23 in the laminated exterior material 1 of Figs. 1A to 1C and the uncoated portions 12a and 14a are also the same.

On the other hand, the adhesive uncoated portion 12a on the side of the heat-resistant resin layer 13 is formed so that the metal foil 11 is exposed as a conductive portion, and the metal foil 11 is exposed by the removal of the easily peelable portion 21.

[tangent line]

The tangent lines 20 and 22 are not limited to the above-described perforation lines that penetrate the heat resistant resin layer 13 or the thermoplastic resin layer 15. Other tangent lines can be exemplified as grooves in which the resin layer is cut to the middle of the thickness. The groove may be a line, or a short groove may be continuously formed as a dotted line. Further, even if the easily peelable portion is completely cut, it is only required to be attracted to the metal foil by static electricity or the like and left on the laminated outer member, and the cut line is also included in the tangent of the present invention. Further, in order to leave the easily peelable portion to be cut on the layer immediately below, it may be left in the resin layer using an adhesive tape or the like.

[Manufacturing method of laminated exterior material]

The laminated exterior material 1 of Figs. 1A to 1C, that is, the laminated exterior material 1 having the adhesive uncoated portions 12a and 14a of the voids, is produced, for example, by the following method.

The metal foil 11 and the heat resistant resin layer 13 are bonded together by the following steps using the first adhesive layer 12.

(1) An adhesive which becomes the first adhesive layer 12 is applied on the first surface of the metal foil 11. In this case, the metal foil 11 and the heat-resistant resin layer 13 are bonded together and subjected to aging treatment by applying a gravure roll having a surface having irregularities, shielding, or the like while forming an adhesive uncoated portion 12a to which an adhesive is not applied. .

(2) A tangent line 20 is formed on the heat resistant resin layer 13 along the periphery of the adhesive uncoated portion 12 to form the easily peelable portion 21. The tangent line 20 is formed by cutting a heat-resistant resin layer 13 by a tool such as a Thomson blade or a tipped blade, a laser cutter, a hot knife, or the like.

(3) The second surface of the metal foil 11 is coated with the adhesive of the second adhesive layer 14 while forming the adhesive uncoated portion 14a by the same means as described above, and then the metal foil 11 is The thermoplastic resin layer 15 is attached and subjected to an aging treatment.

(4) The tangential line 22 is formed in the thermoplastic resin layer 15 by the same means as described above to form the easily peelable portion 23.

The laminated exterior material 2 having the active material portion 16 of Fig. 2 can be produced, for example, by the following method.

(1) An active material portion 16 is formed by applying an adhesive to a desired position on the second surface of the metal foil 11 and applying a paste-form active material thereon.

(2) The curing is carried out without affecting the active material portion 16, and the heat-resistant resin layer 13 is bonded in the same manner as the exterior material 1 and subjected to an aging treatment.

(3) The tangential line 20 is formed by the same method as the exterior material 1, and the easily peelable portion 21 is formed.

(4) At the end of (2), the metal foil is applied as an adhesive for the second adhesive layer 14 around the active material portion 16 formed by (1) by using a gravure roll or a mask having irregularities on the surface. 11 is bonded to the thermoplastic resin layer 15 to carry out an aging treatment. By this step, the adhesive uncoated portion 14a to which the adhesive is not applied is formed substantially in the metal foil 11, and the active material portion 16 is further formed in the adhesive uncoated portion 14a.

(5) The tangential line 22 is formed in the thermoplastic resin layer 15 to form the easily peelable portion 23.

The method for producing the laminated exterior material of the present invention is not limited to the above method. Further, it is not limited to forming a tangent after lamination, and a tangential line may be formed in advance in the resin layer before bonding. The laminated exterior material of the present invention is produced by laminating a resin layer formed with a tangential line and a metal foil.

Further, the aforementioned laminated exterior material 2 can be produced from the laminated exterior material 1. That is, first, as shown in Fig. 2, the metal foil exposed portion 25 appears by peeling off the easily peelable portion 23 of the laminated exterior material 1. Further, the metal foil exposed portion 25 is coated with the active material of the active material portion 16 to obtain a laminated exterior material 2.

[electric storage device]

4 and 5 show two types of power storage devices 3 and 4 in which the exterior bodies 30 and 31 are produced from the laminated exterior materials 1 and 2. In the power storage devices 3 and 4, the metal foil 11 of the laminated exterior materials 1 and 2 is used as an electrical conduction portion for electrical transmission and reception, and is a device that does not have a tab.

In addition, in FIGS. 3 and 4, the drawings of the first adhesive layer 12 and the second adhesive layer 14 of the laminated exterior materials 1 and 2 are omitted.

(1st power storage device)

In the power storage device 3 of Fig. 4, the exterior body 30 is made of a body 40 having a recess and a cover 50 covering the plane of the body 40, and is manufactured by using the laminated exterior material 1 individually.

The body 40 is subjected to processing such as bulging molding or strand forming for the laminated exterior material 1 of the planar sheet, and the concave portion 41 which is a plan view or rectangular shape of the battery element chamber 60 is formed, and has a concave portion 41. The flange portion 42 of the four sides of the opening edge extends almost horizontally outward. The inner side of the bottom wall of the recessed portion 41, that is, the surface of the thermoplastic resin layer 15 is formed with a first inner conductive portion 43 exposing the metal foil 11. Further, at least one of the four flange portions 42 on the four sides, that is, the heat-resistant resin layer 13 is provided with the easily peelable portion 21.

The size of the cover 50 is the same as that of the main body 40. When combined, the exposed metal is formed at a position facing the first inner conductive portion 43 in the battery element chamber 60, that is, a surface on the side of the thermoplastic resin layer 15. The second inner conductive portion 51 of the foil 11. Further, an easily peelable portion 21 is provided as a surface on the heat-resistant resin layer 13 side of the outer surface of the lid body 50.

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

In the power storage device 3, the first inner conductive portion 43 of the main body 40 is connected to the end portion of the positive electrode foil 71 of the battery element 70 via the conductive adhesive 74, and the second inner conductive portion 51 of the cover 50 is provided. The conductive adhesive 74 is connected to the end of the negative electrode foil 72, and an electrolyte is injected to heat seal the periphery of the battery element chamber 60 to form a heat seal portion 61.

In the power storage device 3, the first outer conductive portion 44 is formed by removing the metal foil 11 from the easily peelable portion 21 of the main body 40, and the metal foil 11 is exposed to form the second outer conductive portion by removing the easily peelable portion 21 of the cover 50. Part 52.

In the battery unit 60, the metal portion of the positive electrode foil 71 in the battery element chamber 60 is electrically connected to the metal foil 11 of the main body 40 by the first inner conductive portion 43 and the first outer conductive portion 44 is provided on the outer surface of the outer casing 30. Conduction 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 body 50 by the second inner conductive portion 51, and the second outer conductive portion 52 is obtained outside the outer casing 30. External conduction. Further, the power storage device 1 is electrically received by the first outer conductive portion 44 and the second outer conductive portion 52 provided in the outer casing 30.

The first inner conductive portion 43 of the main body 40 is a metal foil exposed portion formed by removing the easily peelable portion 23 provided on the thermoplastic resin layer 15 of the laminated outer member 1. The main body 40 is formed by forming a concave portion 41 from the laminated exterior material 1 of the planar sheet, and cutting the size of the flange portion 42. When the first inner conductive portion 43 is required to be coated with the conductive adhesive 74, the step of forming or cutting the concave portion 41 does not require the metal foil 11 to be exposed. Therefore, the easily peelable portion 23 may be removed before the coating, and the easy peeling portion 23 is not removed in the step of forming or cutting the concave portion 41, and the exposed predetermined portion of the metal foil 11 can be left. On the other hand, when the first outer conductive portion 44 is required to be energized, the step of forming or cutting the concave portion 41 is started, when the battery element 70 is loaded, when the body 40 is combined with the lid 50, and the heat sealing portion 61 is used. The metal foil 11 is not required to be exposed at the time of formation. Therefore, the easily peelable portion 21 may be removed before being energized. Before this, the easily peelable portion 21 covers the first outer conductive portion 44 and the second outer conductive portion 52 to protect the exposed predetermined portion of the metal foil 11.

The same applies to the cover 50, and the second inner conductive portion 51 until the conductive adhesive 74 is applied to protect the exposed portion of the metal foil 11 by leaving the easily peelable portion 23, and the second outer conductive portion The exposure of the predetermined portion of the metal foil 11 can be protected by leaving the easily peelable portion 21 until the power is turned on.

(2nd power storage device)

The power storage device 4 of Fig. 5 is a thin device in which the exterior body 31 is composed of two flat laminated exterior materials 2, and the individual metal foils 11 are used as a positive electrode and a negative electrode.

The two laminated exterior materials 2 are arranged such that the thermoplastic resin layers 15 face each other. In the drawing, the positive electrode active material portion 76 as the active material portion 16 is formed on the surface of the laminated exterior material 2 on the upper side of the thermoplastic resin layer 15 side. Further, in the heat resistant resin layer 1 An easy peeling portion 21 is provided on one side of the side of the three sides. The first outer conductive portion 103 is formed by exposing the metal foil 11 by removing the easily peelable portion 21. On the other hand, the negative electrode active material portion 77 as the active material portion 16 is formed on the surface of the laminated exterior material 2 disposed on the lower side of the thermoplastic resin layer 15 in the drawing. Further, an easily peelable portion 21 is provided adjacent to the end of the surface on the side of the heat-resistant resin layer 13 that faces the first outer conductive portion 103. The second outer conductive portion 105 is formed by exposing the metal foil 11 by removing the easily peelable portion 21.

In the power storage device 4, the positive electrode active material portion 76 and the negative electrode active material portion 77 of the two laminated outer materials 2 are sandwiched between the separators 73, and the electrolyte is thermally sealed together with the thermoplastic resin layer 15. Production. In Fig. 5, 63 denotes a heat seal portion. In the present invention, 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, and the positive electrode active material portion 76, the negative electrode active material portion 77, and the separator 73 are battery elements 75. Further, the space in which the electrode element 75 is present is the battery element chamber 62.

The power storage device 4 is electrically and electrically received by the first outer conductive portion 103 and the second outer conductive portion 105 on the outer surface of the outer casing 31.

The positive electrode active material portion 76 and the negative electrode active material portion 77 are exposed by removing the easily peelable portion 23 provided on the thermoplastic resin layer 15 of the laminated exterior material 2 of Fig. 3 . 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 combined with the separator 73, the positive electrode active material portion 76 can be protected by leaving the easily peelable portion 23 and Negative electrode active material portion 77. On the other hand, when the first outer conductive portion 103 and the second outer conductive portion 105 are required to be energized, the metal foil 11 does not need to be exposed when combined. Therefore, the easily peelable portion 21 may be removed just before energization, and the metal foil 11 is covered with the easily peelable portion 21 to protect the metal foil 11 before.

In the power storage devices 3 and 4 which are completed as described above, the easily peelable portions 23 in the battery element chambers 60 and 62 are removed, but the conductive adhesive 74 (see FIG. 4) is used in the production step. The preparation of the combination or the leaving of the easily peelable portion 23 is not performed until the combination is performed, and the metal foil 11 or the positive electrode active material portion 76 and the negative electrode active material portion 77 can be protected from damage or corrosion. On the other hand, in the outer faces of the exterior bodies 30, 31, when the first outer conductive portions 44, 103 and the second outer conductive portions 52, 105 are energized, they are left to be protected by not removing the easily peelable portion 21. The metal foil 11 is not damaged or corroded or the like. Since the easily peelable portions 21 and 23 are surrounded by the tangents 20 and 22, they can be easily removed.

In addition, the power storage device 4 is an example in which the laminated power storage device 2 is used as the second power storage device. However, after the metal foil exposed portion 15 is removed from the easily peelable portion 23 of the laminated exterior material 1, the metal is exposed. The exposed portion 15 is coated with the active material of the active material portion 16, and the same material as the laminated outer member 2 can be produced.

The use of the laminated exterior material of the present invention is not limited to the power storage device, and the power storage device is not limited to the embodiment shown in Figs. 4 and 5 . The surface or the number of the easily peelable portions may vary depending on the use of the laminated exterior material, and the laminated exterior material of the present invention is provided with at least one of the heat resistant resin layer and the thermoplastic resin layer as an essential part. .

The use of the laminated exterior material in which the easily peelable portion is provided only in the heat resistant resin layer can be exemplified by the food container. The metal foil exposed portion is formed as a heat resistant resin layer on the outer surface of the food container, and the exposed portion of the metal foil contacts the heating element for food. The contents of the liquid, etc. are warmed, or the food is interposed. The contents of the liquid and the like are directly energized to be sterilized by Joule heat, and a food container which is feasible as described above can be produced. The power storage device of the exposed portion of the metal foil is provided only on the outer surface of the outer casing. In other words, the metal foil of the laminated exterior material is not used as a conductor, and the outer casing can be used as a welded portion to the substrate or the frame.

Further, when the metal foil of the laminated exterior material is used as the conduction portion of the electrical storage device, the conduction portion on the outer surface of the outer casing is not limited to the surface to be provided on the side of the heat resistant resin layer. Since the thermoplastic resin layer is exposed on the outer surface of the outer casing by offsetting the end portions of the two laminated outer materials, the outer conductive portion can be provided on the surface of the thermoplastic resin layer. On the other hand, the inner conductive portion facing the inside of the battery element chamber must be provided on the side of the thermoplastic resin layer side. Therefore, the laminated exterior material used for the exterior body of the power storage device which does not have a sheet is provided with an easy peeling part in both the surface of the heat resistant resin layer side and the surface of the thermoplastic resin layer side. Alternatively, a plurality of easily peelable portions may be provided on the side of the thermoplastic resin side.

[Composite materials for laminated exterior materials and power storage devices]

Although the present invention does not limit the material of the laminated exterior material, the following materials are exemplified as suitable materials.

(metal foil)

The metal foil layer 11 serves as a gas barrier property for imparting oxygen or moisture intrusion to the laminated exterior materials 1 and 2. Further, when the metal foil 11 is used as a conduction portion, a metal foil having good conductivity is used. For example, an aluminum foil, a copper foil, a nickel foil, a stainless steel foil, or such a coated foil, such a blunt foil or an unfired blunt foil, etc. are mentioned. Further, a metal foil plated with a conductive metal such as nickel, tin, copper, or chromium, for example, a plated aluminum foil can be preferably used. Further, the thickness of the metal foil 11 is preferably 7 to 150 μm .

Further, it is preferable that the metal foil layer 11 is formed into a film. The chemical conversion film is formed by applying a chemical conversion treatment on the surface of the metal foil, by applying such a film The chemical conversion treatment can sufficiently prevent the corrosion of the surface of the metal foil caused by the contents (electrolyte, etc.). For example, the metal foil can be subjected to a chemical conversion treatment by the following treatment. In other words, the aqueous solution of any one of the following 1) to 3) is applied to the surface of the metal foil subjected to the degreasing treatment, and then dried to be subjected to a chemical conversion treatment.

1) An aqueous solution containing a mixture of at least one of phosphoric acid, chromic acid, and a metal salt selected from the group consisting of a metal salt of a fluoride and a non-metal salt of a fluoride.

2) at least one of phosphoric acid, at least one selected from the group consisting of an acrylic resin, a chitosan derivative resin, and a phenol resin, and at least one selected from the group consisting of chromic acid and chromium (III) salt. An aqueous solution of a mixture of compounds.

3) a resin containing at least one selected from the group consisting of phosphoric acid, an acrylic resin, a chitosan derivative resin, and a phenol resin, and at least one selected from the group consisting of chromic acid and chromium (III) salt And an aqueous solution of a mixture of at least one compound selected from the group consisting of a metal salt of a fluoride and a non-metal salt of a fluoride.

The chemical conversion film has a chromium adhesion amount (single side) of preferably 0.1 mg/m ² to 50 mg/m ^{2 , and particularly} preferably 2 mg/m ² to 20 mg/m ² .

(heat resistant resin layer)

The heat resistant resin layer constituting the heat resistant resin layer 13 is a heat resistant resin that does not melt due to the heat sealing temperature at the time of heat sealing. The heat resistant resin is preferably a heat resistant resin having a high melting point higher than a melting point of the thermoplastic resin constituting the thermoplastic resin layer 15 by 10 ° C or higher, and a melting point higher than a thermoplastic resin having a melting point of 20 ° C or higher. A high melting point heat resistant resin is particularly preferred. For example, it is preferred to use an extended polyimide film (stretched nylon film or the like) or an extended polyester film. Among them, a biaxially stretched polyimide film (a biaxially stretched nylon film, etc.), a biaxially stretched polybutylene terephthalate (PBT) film, and a biaxially stretched polyethylene terephthalate (PET) film are used. Or a biaxially stretched polyethylene naphthalate (PEN) film is particularly preferred. Further, the heat-resistant resin layer 13 may be formed in a single layer, or may be formed, for example, by a layer formed of an extended polyester film/extended polyamide film (a layer formed by stretching an PET film/extended nylon film). The thickness of the heat resistant resin layer 13 is preferably 20 μm to 100 μm .

Further, the adhesive constituting the first adhesive layer 12 to which the heat resistant resin layer 13 is bonded is a group selected from a polyester urethane-based adhesive and a polyether urethane-based adhesive. At least one of the binders 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 preferably selected from the group consisting of polyethylene, polypropylene, olefin-based copolymers, acid denatured materials, and ionomers. The thermoplastic resin is formed of an unstretched film, and the thickness of the thermoplastic resin layer 15 is preferably 20 μm to 150 μm.

Further, the adhesive constituting the second adhesive layer 14 to which the thermoplastic resin layer 15 is bonded is preferably a layer formed of an olefin-based adhesive. When a two-liquid curing type olefin-based adhesive is used, it is possible to sufficiently prevent a decrease in adhesion due to swelling of 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 electrode side metal foil 71 is preferably a hard or soft aluminum foil having a thickness of 7 to 50 μm, and the negative electrode side metal foil 72 is preferably a copper foil having a thickness of 7 to 50 μm. Aluminum foil or titanium foil, stainless steel foil. Further, the separator 73 may be a separator made of polyethylene, a separator made of polypropylene, a separator formed of a plurality of films of a polyethylene film and a polypropylene film, or a resin separator made thereon. A separator formed of a wet or dry porous film formed by coating a heat-resistant inorganic substance such as phthalate. 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, for example, PVDF (polyvinylidene fluoride), SBR (styrene-butadiene rubber), CMC (carboxymethylcellulose sodium salt, etc.), PAN (polyacrylonitrile). A mixture of a salt (for example, lithium cobaltate, lithium nickelate, lithium iron phosphate, lithium manganate, or the like) is added to the adhesive. The thickness of the positive electrode active material portion 76 is preferably set to 2 μm to 300 μm . Further, the positive electrode active material portion 76 may contain a conductive auxiliary agent such as carbon black or CNT (carbon nanotube). Further, the negative electrode active material portion 77 is, for example, a mixture of additives (for example, graphite, lithium titanate, Si-based alloy, tin-based alloy, or the like) added to an adhesive such as PVDF, SBR, CMC, or PAN. Things are formed. The thickness of the negative electrode active material portion 77 is preferably set to be 1 μm to 300 μm . Further, the negative electrode active material portion 77 may contain a conductive auxiliary agent such as carbon black or CNT (carbon nanotube).

Further, in any of the battery elements 70 and 75 of the type, the separator 73 can be suitably formed by a plurality of thin films formed of a polyethylene separator, a polypropylene separator, a polyethylene film, and a polypropylene film. A plate or a separator made of a wet or dry porous film formed by coating a heat-resistant inorganic material such as phthalate on a resin separator.

The present application claims the priority of Japanese Patent Application No. 2015-163334, the entire disclosure of which is incorporated herein by reference.

The terms and descriptions used herein are for describing embodiments of the invention, but the invention is not limited thereto. It is to be understood that any equivalents of the features disclosed and described herein are not to be construed as limited.

[Industrial use possibility]

The laminated exterior material of the present invention can be suitably used as a part of the resin layer to remove the metal foil from the exterior material.

1‧‧‧Laminated exterior materials

11‧‧‧metal foil

12‧‧‧First adhesive layer

12a, 14a‧‧‧Adhesive uncoated part

13‧‧‧Heat resistant resin layer

14‧‧‧second adhesive layer

20, 22‧‧ ‧ tangent

21, 23‧‧‧Easy stripping department

Claims (5)

A laminated exterior material characterized in that a first adhesive layer is bonded to a heat resistant resin layer on a first side of the metal foil, and a thermoplastic resin layer is bonded to the second surface via a second adhesive layer. At least one of the heat resistant resin layer and the thermoplastic resin layer is provided with an easily peelable portion surrounded by a tangential line formed by cutting the resin layer. The laminated exterior material according to the first aspect of the invention, wherein the detachable portion is provided with a nip for holding. The laminated exterior material according to the first or second aspect of the invention, wherein the adhesive layer between the resin layer having the easy-peelable portion and the metal foil is provided directly under the easy-peeling portion The adhesive uncoated portion of the adhesive is not applied. The laminated exterior material for a storage battery device according to the third aspect of the invention, wherein the second uncoated portion of the metal foil is formed with an adhesive uncoated portion, and the uncoated portion of the adhesive is provided with an active portion. Material. A power storage device comprising: a battery element having a positive electrode element, a negative electrode element, and a separator disposed therebetween; and a first surface of the metal foil bonded to the heat resistant resin layer and bonded to the second surface The thermoplastic resin layer of the two laminated outer materials of the thermoplastic resin layer faces the inner side and faces each other; and the battery element chamber in which the battery element is accommodated is sealed by melting the thermoplastic resin layer The laminated exterior material is obtained by removing the easily peelable portion facing the battery element chamber of the laminated exterior material described in the first aspect of the patent application, without removing the outer casing Easy to peel off on the outside In addition to the external components, the metal foil of the individual laminated exterior materials, the positive electrode element and the negative electrode element are connected to each other.