JP2017199593A - Outer packaging body for power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an outer packaging body for a provide power storage device compact.SOLUTION: A outer packaging body 30 comprises: first and second exterior materials each arranged by laminating a heat resistant resin layer, a piece of metal foil and a heat-fusable resin layer; and first and second inside conducting parts each formed on a face of the corresponding exterior material on the side of the heat-fusable resin layer and electrically connected to the piece of metal foil. In the outer packaging body 30, the heat-fusable resin layers face each other, and the outer packaging body; and a battery element room is formed by a heat-sealing part 61 surrounding the room, and the first and second inside conducting parts are exposed in the room. The first and second exterior materials have a first conducting flange part 46 and a second conducting flange part 56 respectively, and the first and second conducting flange parts are extended to the outside the heat-sealing part. The first conducting flange part 46 or the second conducting flange part 56 is folded back, whereby a first outside conduction part 17 and a second outside conduction part 27 electrically connecting the respective pieces of metal foil are faced toward a common direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an exterior body for an electricity storage device using a laminate exterior material and an electrical storage device using the exterior body.

  Batteries such as storage batteries for mobile communication terminals, in-vehicle storage batteries, storage batteries for regenerative energy recovery, capacitors, and all solid-state batteries have become smaller and lighter. A laminate exterior material in which resin films are bonded to both surfaces with an adhesive is often used (see Patent Document 1).

  In the capacitor laminate case described in Patent Document 1, the resin film layer inside the case is cut out to expose the metal foil to form an electrode connection portion, and the resin film layer outside the case is cut out to expose the metal foil. Thus, electrode terminals are formed. Since this type of laminate case does not require a tab lead, the capacitor can be reduced in size and weight.

JP 2013-161694 A

  In the capacitor described in Patent Document 1, the positive electrode connection portion is provided on one surface of the laminate case, and the negative electrode connection portion is provided on the opposite surface. As described above, when the positive electrode connection portion and the negative electrode connection portion are three-dimensionally arranged, it is necessary to three-dimensionally arrange the connecting members to these, so that the circuit on which the capacitor is mounted becomes complicated, so the size is reduced. Difficult to do.

  In view of the above-described technical background, an object of the present invention is to provide an exterior body for an electrical storage device in which connection members can be arranged in a compact manner and the entire current collecting circuit can be reduced, and an electrical storage device using the exterior body.

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

[1] The first heat-resistant resin layer is laminated on one surface of the first metal foil, the first heat-fusible resin layer is laminated on the other surface, and the surface on the first heat-fusible resin layer side And a second heat-resistant resin layer on one surface of the second metal foil and a second heat-melting layer on the other surface. A second exterior material in which a second resin layer is formed and a second inner conductive portion is formed on the second heat-fusible resin layer side surface;
The first heat-fusible resin layer of the first exterior material and the second heat-fusible resin layer of the second exterior material face each other, and the first heat-fusible resin layer and the second heat-fusible resin layer Is surrounded by the heat-sealed part fused, thereby forming a battery element chamber facing the first inner conductive part and the second inner conductive part in the room,
The first exterior material has a first conductive flange portion extended to the outside of the heat sealing portion, and a first outer conductive portion that is electrically connected to the first metal foil is formed on the first conductive flange portion. The second exterior material has a second conductive flange portion extended to the outside of the heat-sealed portion, and a second outer conductive portion is formed in the second conductive flange portion to conduct to the second metal foil. And
An exterior body for an electricity storage device, wherein the first conductive flange portion or the second conductive flange portion is folded back so that the first outer conductive portion and the second outer conductive portion are directed in the same direction.

  [2] The preceding item 1 in which the first outer conductive portion is formed on the surface on the first heat-fusible resin layer side, and the second outer conductive portion is formed on the surface on the second heat-fusible resin layer side. The exterior body for electrical storage devices described in 1.

  [3] The exterior body for an electricity storage device according to item 1 or 2, wherein the first outer conductive portion and the second outer conductive portion are adjacent to each other.

  [4] The exterior body for an electricity storage device according to item 3, wherein the first conductive flange portion and the second conductive flange portion are formed in parallel within the same side of the heat sealing portion.

  [5] The battery element is housed in the battery element chamber of the exterior body for an electricity storage device according to any one of 1 to 4 above, and the positive electrode element of the battery element is electrically connected to the first inner conducting portion of the exterior body. And the negative electrode element is electrically connected to the second inner conductive portion.

  In the exterior body for an electricity storage device described in [1] above, the first outer conducting portion of the first exterior member that transmits and receives electricity and the second outer conducting portion of the second exterior member face the same direction on the outer surface of the exterior body. Since it is provided, the connection member connected to the first outer conductive portion and the second outer conductive portion in the electricity storage device using the exterior body is also arranged on the same side. For this reason, it is possible to simplify and miniaturize the structure of the current collecting circuit on which the power storage device is mounted.

  Since the 1st inner side conduction part and the 1st outer side conduction part are concentrated on the surface by the side of the 1st heat-fusible resin layer, the exterior body for electrical storage devices given in the above [2] is efficient. Can be produced well. Similarly, since the 2nd inner side conduction | electrical_connection part and the 2nd outer side conduction | electrical_connection part are concentrated on the surface by the side of the 2nd heat-fusible resin layer, a 2nd exterior material can be produced efficiently.

  Since the first outer conductive portion and the second outer conductive portion are adjacent to each other in the electricity storage device exterior body according to the above [3], the current collecting portion can be concentrated, and the structure of the current collecting circuit can be further simplified. Miniaturization can be achieved.

  Since the first outer conducting portion and the second outer conducting portion are provided in parallel within the same side of the heat sealing portion, the electricity storage device exterior body according to the above [4] is dimensioned by the conductive flange portion. The power storage device can be miniaturized while minimizing the expansion, and the current collecting circuit can be miniaturized.

  The power storage device according to [5] described above uses the exterior body according to any one of [1] to [4], thereby simplifying and downsizing the structure of the current collecting circuit on which the power storage device is mounted. be able to.

It is sectional drawing of the exterior material which comprises the exterior body for electrical storage devices of this invention. It is a perspective view of one Embodiment of the exterior body for electrical storage devices using the exterior material of FIG. It is a perspective view which shows the assembly process of the exterior body of FIG. It is a top view of one Embodiment of the electrical storage device of this invention. It is the 4B-4 sectional view taken on the line in FIG. 4A. It is the 4C-4C line expanded sectional view in FIG. 4A. It is the 4D-4D line expanded sectional view in FIG. 4A. It is sectional drawing of the other exterior material which comprises the exterior body for electrical storage devices of this invention. It is a principal part perspective view of the exterior body using the exterior material of FIG. It is a perspective view of the other form of the exterior body using the exterior material of FIG. It is a top view of other embodiments of an electrical storage device of the present invention. It is the 8B-8B sectional view taken on the line in FIG. 8A. It is the 8C-8C line expanded sectional view in Drawing 8A.

  1-8B show an embodiment of an exterior body for an electricity storage device and an electricity storage device of the present invention.

  In the following description, members denoted by the same reference numerals represent the same or equivalent members, and duplicate descriptions are omitted. 4B, 4C, 4D, 8B, and 8C showing the cross section of the outer package or the power storage device, a part of the layers is not shown.

[Exterior body]
FIG. 1 shows a laminated structure of a first exterior material 10a and a second exterior material 20a that are materials of the exterior body 30 in FIG.

  The first exterior material 10a is laminated by laminating the first heat-resistant resin layer 13 on one surface of the first metal foil 11 with the adhesive layer 12 and the first heat-fusible property on the other surface with the adhesive layer 14. The resin layer 15 is bonded and laminated. On the surface on the first heat-fusible resin layer 15 side, there are formed two conductive portions 16 and 17 where the first metal foil 11 is exposed without the first heat-fusible resin layer 15 and the adhesive layer 14. Yes. One of these conductive portions is a first inner conductive portion 16 and the other is a first outer conductive portion 17 in an exterior body 30 to be described later.

  Similarly, the second exterior material 20a is laminated with the second heat-resistant resin layer 23 bonded to one surface of the second metal foil 21 by the adhesive layer 22, and the second heat material 20a by the adhesive layer 24 on the other surface. A fusible resin layer 25 is laminated and laminated. On the surface on the second heat-fusible resin layer 25 side, there are formed two conductive portions 26 and 27 where the second metal foil 21 is exposed without the second heat-fusible resin layer 25 and the adhesive layer 24. Yes. One of these conductive portions is a second inner conductive portion 26 and the other is a second outer conductive portion 27 in an exterior body to be described later.

  In the present invention, the conducting portions 16, 17, 26, 27 are required to conduct to the first metal foil 11 or the second metal foil 21, and the first metal foil 11 or the second metal foil 21 is exposed. Is not a requirement. For example, when the adhesive layers 12, 14, 22, 24 are formed of a conductive adhesive, the adhesive layers 12, 14, 22, 24 on the first metal foil 11 or the second metal foil 21 are exposed. Even if it does, the conduction | electrical_connection part is formed. Moreover, the dimension of the said conduction | electrical_connection part 16, 17, 26, 27 is arbitrarily set according to the shape of an exterior body, and the shape of a battery element. Since the shapes of the first inner conductive portion 16 and the second inner conductive portion 26 are designed to match the shapes of the contact portions of the battery element with the positive electrode element and the negative electrode element, respectively, The shape of the second inner conducting portion 26 does not have to be the same. Since the shapes of the first outer conducting portion 17 and the second outer conducting portion 27 are designed according to the shape of the current collecting portion in the current collecting circuit, the shapes of the first outer conducting portion 17 and the second outer conducting portion 27 are designed. Need not be identical. The shapes of the first outer conducting portion 18 and the second outer conducting portion 28 of the first exterior member 10b and the second exterior member 20b described later are also the same.

  As shown in FIG. 2, the exterior body 30 includes a main body 40 in which the first exterior material 10a is three-dimensionally formed to form a recess 41, and a flat lid plate 50 made of the second exterior material 20a. The first heat-fusible resin layer 15 of 40 (first outer packaging material 10a) and the second heat-fusible resin layer 25 of the cover plate 50 (second outer packaging material 20a) are assembled facing each other. The outer package 30 is a box type in which the battery element chamber 60 is formed in the space in the recess 41.

  The main body 40 includes a concave portion 41 having a rectangular shape in plan view formed by processing such as overmolding or drawing so that the surface on the first heat-fusible resin layer 15 side is concave, and the opening edge of the concave portion 41 Heat sealing flanges 42, 43, 44, 45 extending substantially horizontally from the outside. The flange 42 on one side of the four sides is extended outward, and the extended portion is a first conductive flange portion 46. The first inner conducting portion 16 is provided on the bottom surface of the recess 41, and the first outer conducting portion 17 is provided in a region that is ½ of the side length of the first conducting flange portion 46.

  On the other hand, the cover plate 50 is provided with a second inner conductive portion 26 at a position facing the first inner conductive portion 16 of the main body 40, and the flanges 42, 43, 44, 45 of the main body 40 are provided on four sides thereof. Peripheral portions 52, 53, 54, and 55 are formed that are overlapped and heat sealed. Hereinafter, this peripheral portion is also referred to as a flange 52, 53, 54, 55. The flange 52 on one side of the four sides is extended outward in a region of ½ of the length of the side, and the extended portion is a second conductive flange portion 56. In the assembled state of the exterior body 30, the second conductive flange portion 56 is formed in a region opposite to the first outer conductive portion 17 of the main body 40, and the extension length from the heat sealing flange 52 is the first length. This is twice that of the conductive flange 46. A second outer conducting portion 27 is provided at the distal end side portion of the second conducting flange portion 56.

  As shown in FIGS. 3 and 4A, when the cover 30 is put on the main body 40, the exterior body 30 has four side flanges 42 and 52, 43 and 53, 44 and 54, and 45 and 55, and a recess. 41 is closed and the battery element chamber 60 is formed. The second conductive flange portion 56 of the cover plate 50 has a proximal half that overlaps a portion of the first conductive flange portion 46 where the first outer conductive portion 17 is not present, and the second outer conductive portion 27 is formed on the distal end side. Half of the projection protrudes outward from the first conductive flange 46. Therefore, the first outer conductive portion 17 is exposed without overlapping the cover plate 50, and the second outer conductive portion 27 is exposed without overlapping the main body 40.

  After the battery element 70 is loaded into the battery element chamber 60, the outer package 30 is sandwiched between the overlapping heat sealing flanges 42 and 52, 43 and 53, 44 and 54, and 45 and 55 with a heating element. The battery element chamber 60 is sealed by heating and fusing the first heat-fusible resin layer 15 and the second heat-fusible resin layer 25 to form the heat sealing portion 61. The first conductive flange portion 46 and the second conductive flange portion 56 are juxtaposed within the same side of the heat sealing portion 61 and the length of one side is divided into two. Thereafter, the portion of the second conductive flange portion 56 protruding from the first conductive flange portion 46 is folded back to the cover plate 50 side, and the second outer conductive portion 27 is directed to the cover plate 50 side. Since the first outer conducting portion 17 of the main body 40 originally faces the cover plate 50 side, the first outer conducting portion 17 and the second outer conducting portion 27 face the same direction on the same surface in the exterior body 30 and are heated. It is adjacent on the same side of the sealing part 61.

  Since the second exterior material 20a includes the first metal foil 21, it is easy to crease. If it is stopped with an adhesive or double-sided adhesive tape, it can be prevented from getting up. The overlapping portion of the base end portion of the second conductive flange portion 56 and the first conductive flange portion 46 may be left as it is, or may be bonded with an adhesive or a double-sided adhesive tape. Further, since the first heat-fusible resin layer 15 and the second fusible resin layer 25 are overlapped, heat-sealing can be performed.

  In addition, although the said exterior body 30 combines the 1st exterior material 10a which has the recessed part 41, and the flat 2nd exterior material 20a, it provides a recessed part in the 2nd exterior material 20a, and combines the flat 1st exterior material 10a. You can also. Moreover, a recessed part can be provided in both the 1st exterior material 10a and the 2nd exterior material 20a, and recessed parts can also be faced.

[Power storage device]
4A to 4D, the battery element 70 is sealed in the battery element chamber 60 of the exterior body 30, and electricity is transferred through the first outer conductive portion 17 and the second outer conductive portion 27.

  The battery element 70 includes a laminate in which a separator 73 is disposed between a positive electrode side metal foil 71 coated with a positive electrode active material and a negative electrode side metal foil 72 coated with a negative electrode active material, and is laminated by winding. And an electrolytic solution injected into the battery element chamber 60. The positive electrode side metal foil 71 coated with the positive electrode active material corresponds to the positive electrode element in the present invention, and the negative electrode side metal foil 72 coated with the negative electrode active material corresponds to the negative electrode element in the present invention.

  The power storage device 80 is connected to the first inner conductive portion 16 of the main body 40 through the conductive binder 74 and the end of the positive electrode side metal foil 71 of the battery element 70, and the second inner conductive portion of the lid 50. 26 is connected to the end of the metal foil 72 for negative electrode through a conductive binder 74, and an electrolyte is injected to heat-seal the periphery of the battery element chamber 60 to form a heat-sealed portion 61. Is done.

  In the battery element chamber 60, the positive electrode side metal foil 71 is electrically connected to the first metal foil 11 of the first exterior material 10 a at the first inner conductive portion 16 in the battery element chamber 60, and the first is formed on the outer surface of the exterior body 30. Electrical connection with the outside is obtained at the outer conductive portion 17. Similarly, in the battery element chamber 60, the negative electrode side metal foil 72 is electrically connected to the second metal foil 21 of the second exterior material 20 a by the second inner conductive portion 26, and the second outer conductive portion is formed on the outer surface of the exterior body 30. In 27, electrical connection with the outside is obtained. The electricity storage device 80 transmits and receives electricity through the first outer conductive portion 17 and the second outer conductive portion 27 provided in the exterior body 30. Since the first outer conductive portion 17 and the second outer conductive portion 27 face the same direction on the outer surface of the exterior body 30 and are adjacent to each other, the current collecting portion can be integrated and the power storage device 80 is mounted. The circuit structure can be simplified and downsized. Since the connecting members connected to the first outer conductive portion 17 and the second outer conductive portion 27 can also be arranged on the same side, the power storage device 80 can be incorporated without extending the current collector to a distant position. Further, since the first outer conductive portion 17 and the second outer conductive portion 27 are formed in parallel on the same side and the length of one side is divided into two, the size expansion by the conductive flange portion is minimized. Accordingly, the power storage device can be reduced in size, and the current collecting circuit can be reduced in size.

  In addition, since the first conductive flange portion 46 and the second conductive flange portion 56 are provided in parallel in the same side, the size expansion due to the conductive flange portion can be minimized, so that these are the length of the side. There is no need to bisect the size.

[Other types of exterior bodies and power storage devices]
(Other example 1 of exterior body)
In the exterior body for an electricity storage device of the present invention, the inner conductive portion in the battery element chamber needs to be provided on the surface of the heat-sealable layer resin layer side, but the outer conductive portion that transfers electricity to the outside is heat resistant. It can also be provided on the surface on the resin layer side.

  The exterior body 31 in FIG. 6 is an example in which an outer conductive portion is provided on the surface on the heat resistant resin layer side.

  The exterior body 31 is a combination of a main body 47 made of the first exterior material 10b of FIG. 5 and a lid plate 57 made of the second exterior material 20b. In the first exterior material 10b, the first inner conductive portion 16 is formed on the surface on the first heat-fusible resin layer 15 side, and the first outer conductive portion 18 is formed on the surface on the first heat-resistant resin layer 13 side. Has been. In the second exterior material 20b, a second inner conductive portion 26 is formed on the surface on the second heat-fusible resin layer 25 side, and a second outer conductive portion 28 is formed on the surface on the second heat-resistant resin layer 23 side. Has been.

  2, the first conductive flange portion 48 and the second conductive flange portion 58 are formed by dividing the length of the side into the same side of the heat sealing portion 61. Is common, but the length of both is reversed. That is, the length of the first conductive flange portion 48 of the main body 47 is twice the length of the second conductive flange portion 58 of the lid plate 57. The main body 47 is covered with the cover plate 57, the first conductive flange portion 48 protruding from the mating surface is bent toward the cover plate 57 side, and the first outer conducting portion 18 is directed to the surface on the cover plate 57 side. Since the second outer conductive portion 28 of the cover plate 57 originally faces the cover plate 57 side, the first outer conductive portion 18 and the second outer conductive portion 28 are on one side of the heat sealing portion 61 on the same surface of the exterior body 31. The two are next to each other.

(Other form 2 of exterior body)
The 1st outer side conduction | electrical_connection part and 2nd outer side conduction | electrical_connection part of an exterior body can be arrange | positioned by changing the distance from a heat sealing part on the same side of a heat sealing part.

  7 is a combination of a main body 90 made of the first exterior material 10a of FIG. 1 and a lid plate 95 made of the second exterior material 20a.

  The exterior body 32 is the same as the exterior body 30 of FIG. 2 in that the first exterior material 10a and the second exterior material 20a are the same, but the first conductive flange portion 91 and the second conductive flange portion 96 are both sides. The first outer conductive portion 17 and the first outer conductive portion 17 on the same surface of the exterior body 32 by making a difference between the distance from the heat sealing portion 61 to the first outer conductive portion 17 and the distance from the second outer conductive portion 27. The second outer conducting portion 27 is adjacent. In the exterior body 32, the first conductive flange portion 91 and the second conductive flange portion 96 are formed to have substantially the same dimensions, and the first outer conductive portion 17 and the second outer conductive portion 27 are provided at the respective distal ends. ing. The first outer conductive portion 17 and the second outer conductive portion 27 are exposed on the outer surface of the exterior body 32 by folding back one of the first conductive flange portion 91 and the second conductive flange portion 96. The exterior body 32 in the illustrated example folds the second conductive flange portion 96 of the cover plate 95 to expose the first outer conductive portion 17 and the second outer conductive portion 27 on the surface on the cover plate 95 side. The second outer conducting portion 27 is disposed so as to overlap the heat sealing portion 61.

  Further, when the exterior body as shown in FIG. 7 is manufactured using the exterior materials of the first exterior material 10b and the second exterior material 20b in FIG. 5, the heat of the first conductive flange portion and the second conductive flange portion is obtained. The first outer conducting portion 18 and the second outer conducting portion 28 can be adjacent to each other in the same plane of the exterior body by making a difference in the extension length from the sealing portion and folding back the longer flange.

  The exterior body of the present invention is not limited to the provision of the outer conductive portion outside the heat sealing portion. In the exterior body of the present invention, the two outer conductive portions are directed in the same direction by folding back the first conductive flange portion or the second conductive flange portion. If it exceeds the heat sealing portion, the outer conductive portion can be arranged inside the heat sealing portion.

  As described above, in the first exterior material and the second exterior material that are the materials of the exterior body, the first inner conductive portion and the second inner conductive portion are the first heat-fusible resin layer and the second thermal interface facing the battery element chamber. Although it must be provided in the fusible resin layer, the exterior body of the present invention can be manufactured regardless of which surface the first outer conductive portion and the second outer conductive portion are provided on. However, if the outer conductive portion is formed in the heat-fusible resin layer, the work for providing the inner and outer conductive portions can be concentrated on the surface on the heat-fusible resin layer side, so that the alignment of the inner and outer conductive portions becomes easy. This is advantageous in terms of manufacturing efficiency.

  Moreover, the exterior body of this invention is not limited to being a box type | mold which has the recessed part which forms a battery element chamber. The flat first exterior material and the second exterior material face each other, and the region surrounded by the heat sealing portion can be used as the battery element chamber. In such an exterior body, the first outer conductive portion and the second outer conductive portion of all the forms described above can be combined.

[Other examples of electricity storage devices]
The electricity storage device of the present invention is not limited to the battery element being a laminate of a positive electrode metal foil and a negative electrode metal foil.

  The power storage device 81 of FIGS. 8A to 8C includes the exterior body 35 composed of the flat first exterior material 10a and the second exterior material 20b, and uses the first metal foil 11 as a positive electrode and the second metal foil 21 as a negative electrode. In this thin device, the electrode element 75 includes a positive electrode active material layer 76, a negative electrode active material layer 77, a separator 73, and an electrolytic solution (not shown).

  In the electricity storage device 81, a positive electrode active material layer 76 is applied to the first inner conductive portion 16 of the first exterior material 10a, and a negative electrode active material layer 77 is applied to the second inner conductive portion 26 of the second exterior material 20b. Then, the two exterior members 10a and 20b are overlapped via the separator 73, and the periphery of the first inner conductive portion 16 and the second inner conductive portion 26 is heat sealed together with the electrolytic solution. The positive electrode active material layer 76 and the negative electrode active material layer 77 correspond to the positive electrode element and the negative electrode element in the present invention, and the positive electrode active material layer 76, the negative electrode active material layer 77, the separator 73, and the electrolytic solution are the electrode elements 75, A space where the electrode element 75 exists is a battery element chamber.

  Also in the outer package 35 of the thin power storage device 81 described above, various forms can be applied to the arrangement of the first outer conductive portion 17 and the second outer conductive portion 27 as in the box-type outer package. The exterior body 35 in the illustrated example is the same as the exterior body 30 in FIG. 2, the first conductive flange portion 100 and the second conductive flange portion 101 bisect the length of one side of the heat sealing portion 61, The flange portion 101 is folded back to the second exterior material 20a side. Then, by bending the second conductive flange portion 101, the first outer conducting portion 17 and the second outer conducting portion 27 face each other in the same direction and are adjacent to each other.

[Constituent materials of exterior materials]
Although this invention does not limit the material of each layer which comprises 1st exterior material 10a, 10b and 2nd exterior material 20a, 20b, the following materials can be illustrated as a preferable material.

  The first metal foil 11 on the positive electrode side is preferably a soft aluminum foil, and the thickness is preferably 7 μm to 150 μm. In terms of formability and cost, a soft aluminum foil of 30 μm to 80 μm is particularly preferable. On the other hand, the second metal foil 21 on the negative electrode side is preferably a soft or hard aluminum foil, stainless steel foil, nickel foil, copper foil or titanium foil, and preferably has a thickness of 7 μm to 150 μm, and has impact resistance and bending resistance. From the viewpoint of cost, 15 μm to 100 μm is preferable. In addition, a plated foil or a clad foil can also be used as these metal foils. Furthermore, it is also preferable to form a chemical conversion film on these metal foils.

  As the heat-resistant resin constituting the first heat-resistant resin layer 13 and the second heat-resistant resin layer 23, a heat-resistant resin that does not melt at the heat seal temperature when heat-sealing the exterior material is used. As the heat-resistant resin, it is preferable to use a thermoplastic resin having a melting point higher by 10 ° C. than the melting point of the thermoplastic resin constituting the first heat-fusible resin layer 15 and the second heat-fusible resin layer 25. It is particularly preferable to use a thermoplastic resin having a melting point 20 ° C. or higher than the melting point of the thermoplastic resin. For example, stretched films such as a polyethylene naphthalate film, a polybutylene naphthalate film, and a polycarbonate film are preferable in addition to a polyester film and a polyamide film. The thickness is preferably in the range of 9 μm to 50 μm.

  The thermoplastic resin constituting the first heat-fusible resin layer 15 and the second heat-fusible resin layer 25 is selected from the group consisting of polyethylene, polypropylene, olefin copolymers, acid-modified products thereof, and ionomers. An unstretched film made of at least one thermoplastic resin is preferred, and the thickness is preferably in the range of 20 μm to 80 μm.

  As the adhesives 12 and 22 on the first heat-resistant resin layer 13 and the second heat-resistant resin layer 23 side, for example, a two-component curable polyester-urethane comprising a polyester resin as a main agent and a polyfunctional isocyanate compound as a curing agent. It is preferable to use an adhesive containing a resin or a polyether-urethane resin. On the other hand, as the adhesives 14 and 24 on the first heat-fusible resin layer 15 and the second heat-fusible resin layer 25 side, for example, polyurethane adhesive, acrylic adhesive, epoxy adhesive, polyolefin-based adhesive Examples of the adhesive include an adhesive, an elastomeric adhesive, and a fluorine-based adhesive.

The conducting portion of the exterior material can be formed by the following method. In addition, this invention does not prescribe | regulate the formation method of a conduction | electrical_connection part, and the following is only an example of the formation method of a conduction | electrical_connection part.
(1) A heat-resistant resin layer, a metal foil layer, and a heat-fusible resin layer are bonded with an adhesive by a known method, and the resin layer and the adhesive layer are cauterized and removed by irradiation with a laser. Note that an exterior material bonded using a conductive adhesive can form a conductive portion by removing the resin layer.
(2) When an adhesive is applied to the metal foil, an uncoated portion where no adhesive is applied is formed in a portion where the conductive portion is formed, and a heat-resistant resin layer or a heat-fusible resin layer is bonded. Thereafter, the resin layer on the uncoated part is cut off.
(3) A masking tape is pasted on the portion of the metal foil where the conductive portion is to be formed, and an adhesive is applied to bond the heat-resistant resin layer or the heat-fusible resin layer. Thereafter, the resin layer and the adhesive are removed together with the masking tape.
(4) A conductive adhesive is applied to the metal foil, and a release paper is pasted on a portion where the conductive portion is formed, and a heat-resistant resin layer or a heat-fusible resin layer is bonded. Thereafter, the release paper and the resin layer are removed.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used as an exterior body for a power storage device that is reduced in size and weight.

10a, 10b ... 1st exterior material 11 ... 1st metal foil 13 ... 1st heat resistant resin layer 15 ... 1st heat-fusible resin layer 16 ... conduction | electrical_connection part (1st inside conduction | electrical_connection part)
17, 18 ... conduction part (first outer conduction part)
20a, 20b ... 2nd exterior material 21 ... 2nd metal foil 23 ... 2nd heat resistant resin layer 25 ... 2nd heat-fusible resin layer 26 ... conduction | electrical_connection part (2nd inner side conduction | electrical_connection part)
27, 28 ... conduction part (second outer conduction part)
30, 31, 32, 35 ... exterior body 40, 47, 90 ... main body 41 ... recess 42, 43, 44, 45, 52, 53, 54, 55 ... flange (peripheral part)
46, 48, 91, 100 ... first conductive flange portions 50, 57, 95 ... cover plates 56, 58, 96, 101 ... second conductive flange portion 60 ... battery element chamber 61 ... heat sealing portions 70, 75 ... Battery element 71 ... Positive metal foil (positive electrode element)
72 ... Negative side metal foil (negative electrode element)
73 ... Separator 76 ... Positive electrode active material layer (positive electrode element)
77 ... Negative electrode active part chamber layer (negative electrode element)
80, 81 ... Electric storage device

Claims (5)

The first heat-resistant resin layer is laminated on one surface of the first metal foil, the first heat-fusible resin layer is laminated on the other surface, and the first heat-fusible resin layer side has a first A first exterior material in which a first inner conductive portion conducting to the metal foil is formed, a second heat-resistant resin layer is laminated on one surface of the second metal foil, and a second heat-fusible resin on the other surface A layer is laminated, and a second exterior material having a second inner conductive portion formed on the surface on the second heat-fusible resin layer side and connected to the second metal foil,
The first heat-fusible resin layer of the first exterior material and the second heat-fusible resin layer of the second exterior material face each other, and the first heat-fusible resin layer and the second heat-fusible resin layer Is surrounded by the heat-sealed part fused, thereby forming a battery element chamber facing the first inner conductive part and the second inner conductive part in the room,
The first exterior material has a first conductive flange portion extended to the outside of the heat sealing portion, and a first outer conductive portion that is electrically connected to the first metal foil is formed on the first conductive flange portion. The second exterior material has a second conductive flange portion extended to the outside of the heat-sealed portion, and a second outer conductive portion is formed in the second conductive flange portion to conduct to the second metal foil. And
An exterior body for an electricity storage device, wherein the first conductive flange portion or the second conductive flange portion is folded back so that the first outer conductive portion and the second outer conductive portion are directed in the same direction.   The said 1st outer side conduction | electrical_connection part is formed in the surface at the side of the 1st heat-fusible resin layer, and said 2nd outer side conduction | electrical_connection part is formed in the surface at the side of the 2nd heat-fusible resin layer. Exterior body for electricity storage device.   The exterior body for an electrical storage device according to claim 1 or 2, wherein the first outer conductive portion and the second outer conductive portion are adjacent to each other.   The exterior body for an electricity storage device according to claim 3, wherein the first conductive flange portion and the second conductive flange portion are formed in parallel within the same side of the heat sealing portion. A battery element is housed in the battery element chamber of the exterior body for an electricity storage device according to any one of claims 1 to 4, and the positive electrode element of the battery element is electrically connected to the first inner conducting portion of the exterior body, An electricity storage device, wherein the negative electrode element is electrically connected to the second inner conductive portion.