JP2016006718A - Bagging electrode, lamination type electric device, and manufacturing method for bagging electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bagging electrode, lamination type electric device, and manufacturing method for a bagging device by which separators with heat-resistant layers can easily be jointed to at least one side of a resin layer, thus facilitating manufacture.SOLUTION: A bagging electrode 50 comprises: two separators 30 in which a heat-resistant layer 32 is provided on one side of a resin layer 31; and a cathode 10 sandwiched between the two separators. The bagging electrode 50 has a heat-resistant-layer-less part 33 disposed further outside than the cathode as seen in a plane view on the side of a face where the heat-resistant layers of the two separators are provided and the thickness of each the heat-resistant layer is thin or none, compared to a portion sandwiching the cathode. A joint part 34 for joining the separators is provided in this heat-resistant-layer-less part.

Description

  The present invention relates to a packaged electrode, a stacked electrical device, and a method for manufacturing a packaged electrode.

  A power generation element in an electric device such as a secondary battery is configured by alternately laminating electrodes and separators. The separator easily contracts when heated. When the separator contracts, an electrical short circuit occurs locally and the output of the electrical device decreases.

  Conventionally, a technique has been proposed in which a heat-resistant layer having a melting temperature higher than that of the resin layer is provided on at least one surface of the resin layer, thereby reducing the shrinkage of the separator (see, for example, Patent Document 1).

JP2011-210524

  In the separator described in Patent Document 1, a heat-resistant layer is provided over the entire surface of the resin layer. When the separator is cut by heat such as a hot blade or a laser, a difference occurs between the heat shrinkage in the resin layer and the heat shrinkage in the heat resistant layer, and the warp deformation occurs in the separator. In particular, in a separator in which a heat-resistant layer is provided only on one side of the resin layer, warping deformation appears significantly. When warp deformation occurs in the separator, it is difficult to bring the separators into close contact with each other, and it becomes difficult to join the separators. As a result, it becomes difficult to manufacture a packaged electrode having an electrode sandwiched between two separators and an electrical device using the packaged electrode.

  The present invention has been made to solve the problems associated with the prior art described above, and can easily join the separators provided with the heat-resistant layer on at least one surface of the resin layer, thereby facilitating the production. An object of the present invention is to provide a packaged electrode, a laminated electrical device, and a method for producing the packaged electrode.

  The packaged electrode of the present invention that achieves the above object is provided between two separators each provided with a heat-resistant layer having a melting temperature higher than that of the resin layer on at least one surface of the resin layer, and between the two separators. And sandwiched electrodes. The packaged electrode is further disposed on the outer side of the electrode in a plan view on the surface of the two separators on which the heat-resistant layer is provided, and the thickness of the heat-resistant layer sandwiches the electrode. It has a heat-resistant layer-less portion that is thin or zero compared to the portion. A joining part for joining the separators to each other is provided in the heat-resistant layer-less part.

  The multilayer electrical device of the present invention includes two separators each having a heat-resistant layer having a melting temperature higher than that of the resin layer on at least one surface of the resin layer, and a second sandwiched between the two separators. 1 electrode and the 2nd electrode laminated | stacked on the side of the surface which does not oppose the said 1st electrode of the said 2 sheets of separator. The multilayer electrical device is further disposed on the outer side of the first and second electrodes in a plan view on the side of the surface of the two separators where the heat-resistant layer is provided, and the thickness of the heat-resistant layer Has a heat-resistant layer-less portion which is thinner or zero than the portion sandwiching the first electrode. A joining portion for joining the separators is provided in a portion of the heat-resistant layer-less portion located outside the first and second electrodes as viewed in a plan view.

  In the method for producing a packaged electrode of the present invention, first, two separators provided with a heat-resistant layer having a melting temperature higher than that of the resin layer on at least one surface of the resin layer as a base material are prepared, An electrode is sandwiched between the two separators. Then, the two separators are joined to each other outside the electrode in a plan view and in a heat-resistant layer-less portion where the thickness of the heat-resistant layer is thinner or zero than the portion sandwiching the electrode. .

  According to the packaged electrode of the present invention, since the heat resistant layer-less portion is provided in the separator, when the separator is cut by heat, the difference in heat shrinkage due to the difference in material is reduced in the heat resistant layer-less portion. The deformation of the warp in the separator can be suppressed. Since the warpage of the separator is suppressed, the separators can be easily adhered to each other, and the separators can be easily joined. As a result, it is possible to facilitate the manufacture of a packaged electrode in which an electrode is sandwiched between two separators.

  According to the multilayer electric device of the present invention, the packaged electrode to be used can suppress the warpage of the separator in the same manner as described above, so that the separators can be easily adhered to each other, and the separators can be easily joined. become. As a result, it is possible to facilitate the manufacture of a packaged electrode in which an electrode is sandwiched between two separators and a laminated electric device to which the electrode is applied. Furthermore, since the joint portion is disposed outside the first and second electrodes in a plan view, even if a joint failure occurs in the joint portion, the first electrode and the second electrode Can be reliably prevented.

  According to the method of manufacturing a packaged electrode of the present invention, since the heat resistant layer-less portion is provided in the separator, when the separator is cut by heat, the heat shrinkage difference due to the material difference in the heat resistant layer-less portion. Can be suppressed, and warping deformation of the separator can be suppressed. Since the warpage of the separator is suppressed, the separators can be easily adhered to each other, and the separators can be easily joined. As a result, it is possible to facilitate the manufacture of a packaged electrode in which an electrode is sandwiched between two separators.

It is a perspective view which shows the lithium ion secondary battery as a laminated | stacked electrical device which concerns on embodiment of this invention. It is a perspective view which decomposes | disassembles and shows a lithium ion secondary battery. It is sectional drawing which shows the principal part of a lithium ion secondary battery. 4 (a) and 4 (b) are views showing the form of the joint provided in the heat resistant layer-less part of the separator. It is a perspective view which shows the heating-pressing member of the joining apparatus which joins the separator in a bagging electrode. FIGS. 6A to 6C are cross-sectional views showing a procedure for joining the separators in the packaged electrode.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The dimensional ratios in the drawings are exaggerated for convenience of explanation, and are different from the actual ratios.

  FIG. 1 is a perspective view showing a lithium ion secondary battery 1 as a stacked electric device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the lithium ion secondary battery 1, and FIG. 1 is a cross-sectional view showing a main part of a lithium ion secondary battery 1. 4 (a) and 4 (b) are views showing the form of the joining portion 34 provided in the heat-resistant layer-less portion 33 of the separator 30, and FIG. 4 (a) shows that the joining portion 34 extends continuously without a gap. FIG. 4B shows a form in which the joint portions 34 are intermittently arranged with a gap 35 therebetween.

  Referring to FIGS. 1 and 2, in a lithium ion secondary battery 1 as a stacked electric device, a power generation element 60 that performs charging and discharging is sealed with an exterior material 40. The power generation element 60 is configured by alternately stacking so-called packaged electrodes 50 in which the positive electrode 10 is sandwiched between two separators 30 and the negative electrode 20.

  With reference to FIG. 3, the lithium ion secondary battery 1 of the present embodiment can be summarized as two sheets in which a heat-resistant layer 32 having a melting temperature higher than that of the resin layer 31 is provided on at least one surface of the resin layer 31. Separator 30, a positive electrode 10 (corresponding to a first electrode) sandwiched between two separators 30, and a negative electrode 20 (stacked on the side of the two separators 30 not facing the positive electrode 10 ( Corresponding to the second electrode). The lithium ion secondary battery 1 further extends to the outside of the positive and negative electrodes 10, 20 in a plan view on the side of the surface of the two separators 30 on which the heat resistant layer 32 is provided, and the heat resistant layer 32. Has a heat-resistant layer-less portion 33 that is thinner or zero compared to the portion sandwiching the positive electrode 10. A joining portion 34 for joining the separators 30 to each other is provided in a portion of the heat-resistant layer-less portion 33 that is positioned outside the positive and negative electrodes 10 and 20 in a plan view. The negative electrode 20 may have the same size as the positive electrode 10, but in the illustrated embodiment, the negative electrode 20 has a larger projected area than the positive electrode 10 in the electrode thickness direction.

  Looking at the packaged electrode 50, the packaged electrode 50, if outlined, includes two separators 30 provided with a heat-resistant layer 32 having a melting temperature higher than that of the resin layer 31 on at least one surface of the resin layer 31; A positive electrode 10 sandwiched between two separators 30. The packaged electrode 50 further extends to the outside of the positive electrode 10 in a plan view on the surface of the two separators 30 on which the heat resistant layer 32 is provided, and the thickness of the heat resistant layer 32 sandwiches the electrodes. It has a heat-resistant layer-less portion 33 that is thin or zero compared to the existing portion. The heat-resistant layer-less portion 33 is provided with a joint portion 34 that joins the separators 30 together. Details will be described below.

  The positive electrode 10 is formed by binding a positive electrode active material 12 to both surfaces of a positive electrode current collector 11 which is a conductor. The positive electrode terminal 11 a (see FIGS. 1 and 2) from which power is extracted extends from a part of one end of the positive electrode current collector 11. A plurality of stacked positive electrode terminals 11a are fixed to each other by welding or adhesion.

As the material of the positive electrode current collector 11, for example, an aluminum expanded metal, an aluminum mesh, or an aluminum punched metal is used. In the case of the lithium ion secondary battery 1, various materials (lithium manganese oxide such as LiMn ₂ O 4; manganese dioxide; lithium nickel oxide such as LiNiO ₂ ; LiCoO ₂ ; Such lithium cobalt oxide; lithium-containing nickel cobalt oxide; amorphous vanadium pentoxide containing lithium) or chalcogen compound (titanium disulfide, molybdenum disulfide) or the like is used.

  The negative electrode 20 is laminated on the side of the surface of the two separators 30 that does not face the positive electrode 10. The negative electrode 20 has a larger projected area from the electrode thickness direction than the positive electrode 10. More specifically, the length of the negative electrode 20 in the longitudinal direction (the length in the left-right direction in FIG. 3) is longer than the length of the positive electrode 10 in the longitudinal direction. The length of the negative electrode 20 in the short direction (the length in the direction intersecting the paper surface of FIG. 3) is the same as the length of the positive electrode 10 in the short direction.

  The negative electrode 20 is formed by binding a negative electrode active material 22 to both surfaces of a negative electrode current collector 21 which is a conductor. The negative electrode terminal 21a (see FIGS. 1 and 2) is formed to extend from a part of one end of the negative electrode current collector 21 so as not to overlap the positive electrode terminal 11a. A plurality of laminated negative electrode terminals 21a are fixed to each other by welding or adhesion.

  As the material of the negative electrode current collector 21, for example, a copper expanded metal, a copper mesh, or a copper punched metal is used. In the case of the lithium ion secondary battery 1, a carbon material that occludes and releases lithium ions is used as the material of the negative electrode active material 22. For such carbon materials, for example, natural graphite, artificial graphite, carbon black, activated carbon, carbon fiber, coke, or organic precursors (phenol resin, polyacrylonitrile, or cellulose) are heat-treated in an inert atmosphere and synthesized. Carbon is used.

  The separator 30 is provided between the positive electrode 10 and the negative electrode 20 and electrically isolates the positive electrode 10 and the negative electrode 20. The separator 30 holds an electrolytic solution between the positive electrode 10 and the negative electrode 20 to ensure ion conductivity. The separator 30 is formed in a rectangular shape. The length in the longitudinal direction of the separator 30 is longer than the length in the longitudinal direction of the negative electrode 20 excluding the portion of the negative electrode terminal 21a.

  In the illustrated separator 30, a heat resistant layer 32 having a melting temperature higher than that of the resin layer 31 is provided on one surface of the resin layer 31. For example, polypropylene is used as the material of the resin layer 31. The resin layer 31 is impregnated with a nonaqueous electrolytic solution prepared by dissolving an electrolyte in a nonaqueous solvent. In order to hold the non-aqueous electrolyte, a polymer is included. As the material of the heat-resistant layer 32, for example, a ceramic formed by molding an inorganic compound at a high temperature is used. The ceramic is made of a porous material formed by bonding a ceramic particle such as silica, alumina, zirconium oxide, titanium oxide or the like and a binder. The material of the heat-resistant layer 32 is not limited to ceramics, and may have a melting temperature higher than that of the resin layer 31.

  The heat resistant layer-less portion 33 in the separator 30 is disposed on the side where the heat resistant layer 32 is provided, on the inner side facing the positive electrode 10 in FIG. The heat-resistant layer-less portion 33 extends to the outside of the positive electrode 10 and further extends to the outside of the negative electrode 20 when viewed in a plan view. In the heat-resistant layer-less portion 33, the thickness of the heat-resistant layer 32 is thinner or zero compared to the portion where the positive electrode 10 is sandwiched. This is the same as the amount of the heat-resistant material contained in the heat-resistant layer-less portion 33 being smaller or zero than the amount of the heat-resistant material contained in the heat-resistant layer 32. FIG. 3 shows a case where the amount of the heat-resistant material contained in the heat-resistant layer-less portion 33 is zero. The heat-resistant layer-less portion 33 can be easily formed by intermittently applying the material forming the heat-resistant layer 32 on the resin layer 31.

  When a heat-resistant layer is provided over the entire surface of the resin layer, when the separator is cut by heat from a hot blade or a laser, a difference occurs between the heat shrinkage in the resin layer and the heat shrinkage in the heat-resistant layer, and the separator is warped. Deformation occurs. In particular, when a heat-resistant layer is provided only on one side of the resin layer, warping deformation appears significantly. On the other hand, in the separator 30 provided with the heat-resistant layer-less portion 33 as in the present embodiment, the heat-shrinkage difference due to the difference in material is reduced in the heat-resistant layer-less portion 33, and the separator 30 is warped. Deformation can be suppressed. Since the warpage of the separator 30 is suppressed, it is easy to bring the separators 30 into close contact with each other.

  A junction 34 that joins the separators 30 to each other is provided in the heat-resistant layer-less portion 33. The joining part 34 should just be what joins the separators 30 by applying pressure, heat, or both of pressure and heat, for example. By providing the bonding portion 34 in the heat-resistant layer-less portion 33, the amount of heat-resistant material is smaller than in the case where the bonding portion 34 is provided in the heat-resistant layer 32. Therefore, the pressure and heat applied to the bonding portion 34 can be reduced. Coupled with the fact that it is easy to keep the separators 30 in close contact with each other by suppressing the warpage of the separators 30, the joining of the separators 30 becomes easy.

  It is preferable to provide the joining part 34 in the periphery which opposes among the periphery of the separator 30 (refer FIG. 4). This is because it is possible to reduce the separation of the separator 30 from the positive electrode 10 when the packaged electrode 50 is handled.

  The joining portion 34 is preferably formed from a molten resin material. This is because the separators 30 can be joined to each other by applying heat welding that is generally performed.

  The molten resin material is preferably a material constituting the resin layer 31 of the separator 30. This is because the joint 34 can be formed integrally with the resin layer 31 and the formation of the joint 34 is facilitated.

  As shown in FIG. 4A, the joining portion 34 may extend continuously without a gap, or may be intermittently arranged with a gap 35 therebetween as shown in FIG. 4B. Good. In the former form, since the joining location between the separators 30 becomes long, the joining strength can be increased. The latter form can be advantageously applied in the case where the separators 30 are temporarily joined to the extent that they do not fall off.

  The exterior material 40 is composed of, for example, laminate sheets 41 and 42 each having a metal plate therein, and covers and seals the power generating element 60 from both sides. When the power generating element 60 is sealed with the laminate sheets 41 and 42, a part of the periphery of the laminate sheets 41 and 42 is opened, and the other periphery is sealed by heat welding or the like. An electrolyte solution is injected from the open portions of the laminate sheets 41 and 42, and the separator 30 and the like are impregnated with the charge solution. While decompressing the inside from the open portions of the laminate sheets 41 and 42, the open portions are also heat-sealed and completely sealed.

  As the material of the laminate sheets 41 and 42, for example, three kinds of laminated materials are used. Specifically, for example, polyethylene (PE), ionomer, or ethylene vinyl acetate (EVA) is used as the material of the first layer of the heat-fusible resin adjacent to the negative electrode 20. For example, Al foil or Ni foil is used for the second layer metal foil. For example, rigid polyethylene terephthalate (PET) or nylon is used for the third layer resin film.

  Next, a method for manufacturing the packaged electrode 50 will be described with reference to FIGS. FIG. 5 is a perspective view showing a heating and pressing member of a joining device for joining the separator 30 in the bagging electrode 50, and FIGS. 6A to 6C show a procedure for joining the separator 30 in the bagging electrode 50. It is sectional drawing.

  Referring to FIG. 5, the heating and pressing member 710 is disposed above and below both ends in the longitudinal direction of the pair of separators 30 and moves up and down so as to sandwich and separate the two separators 30. To do. The heating and pressing member 710 is made of stainless steel or copper, for example, and is formed in a rectangular shape. The heating and pressing member 710 moves up and down by a driving unit (not shown). The heating and pressing member 710 is heated by, for example, a heating wire or a heater bulb.

  First, as shown in FIG. 6A, two separators 30 each having a heat-resistant layer 32 having a melting temperature higher than that of the resin layer 31 are prepared on at least one surface of the resin layer 31 as a base material. The positive electrode 10 is sandwiched between the separators 30. The plurality of heating and pressing members 710 are disposed so as to sandwich both ends in the longitudinal direction of the pair of separators 30 from above and below. In FIG. 6A, the lower separator 30, the positive electrode 10, and the upper separator 30 are originally stacked, but are illustrated in a separated state here.

  Next, as illustrated in FIG. 6B, the two separators 30 are bonded to each other outside the positive electrode 10 in a plan view and at the heat-resistant layer-less portion 33. By driving the plurality of heating and pressing members 710 in the direction indicated by the arrow P1 in the figure, the heating and pressing members 710 sandwich both ends in the longitudinal direction of the pair of separators 30 from above and below, and the pair of separators 30 Join. At this time, the pair of separators 30 are heated and pressurized by the heating and pressing member 710. The heating and pressing member 710 is set to a temperature at which the resin layer 31 in the heat resistant layer-less portion 33 is melted and the heat resistant layer 32 is not melted. The resin layer 31 melted by the heating and pressing member 710 is pressurized, and the separators 30 are joined. As shown in FIG. 6C, the plurality of heating and pressing members 710 are driven in the direction indicated by the arrow P <b> 2 in the figure and are separated from the pair of separators 30 that have been joined. In this way, the packed electrode 50 is manufactured.

  As described above, the packaged electrode 50 according to the present embodiment includes the positive electrode sandwiched between the two separators 30 in which the heat-resistant layer 32 is provided on one surface of the resin layer 31 and the two separators 30. 10 and on the surface of the two separators 30 on which the heat-resistant layer 32 is provided, the heat-resistant layer-less part 33 extending to the outside of the positive electrode 10 in a plan view, and the separator 30 provided in the heat-resistant layer-less part 33. And a joining portion 34 for joining together. In the separator 30 provided with the heat-resistant layer-less portion 33, when the separator 30 is cut by heat, the heat-shrinkable-less portion 33 has a small difference in thermal shrinkage due to the difference in material and warps the separator 30. It is possible to suppress the occurrence of deformation. Since the warpage of the separator 30 is suppressed, the separators 30 can be easily adhered to each other, and the separators 30 can be easily joined. As a result, it is possible to facilitate the manufacture of the packaged electrode 50 in which the positive electrode 10 is sandwiched between the two separators 30.

  By providing the joining portion 34 at the opposite peripheral edge of the separator 30, it is possible to reduce the separator 30 from falling off from the positive electrode 10 when handling the packaged electrode 50.

  By forming the joining portion 34 from a molten resin material, it is possible to join the separators 30 to each other by applying heat welding that is generally performed.

  Since the molten resin material is used as the material constituting the resin layer 31 of the separator 30, the joint portion 34 can be formed integrally with the resin layer 31, and the formation of the joint portion 34 is facilitated.

  The joint 34 can be continuously extended without a gap, or can be intermittently arranged with a gap 35 therebetween. In the former form, since the joining location between the separators 30 becomes long, the joining strength can be increased. The latter form can be advantageously applied to the case where the separators 30 are temporarily joined to the extent that they do not fall off.

  A lithium ion secondary battery 1 as a stacked electrical device includes two separators 30 each having a heat-resistant layer 32 provided on one surface of a resin layer 31, and a positive electrode 10 sandwiched between the two separators 30. The negative electrode 20 stacked on the side of the two separators 30 that does not face the positive electrode 10, and the positive and negative electrodes 10 in plan view on the side of the surface on which the heat-resistant layer 32 of the two separators 30 is provided, A heat-resistant layer-less portion 33 extending to the outside of 20, and a joint portion for joining the separators 30 provided in a portion of the heat-resistant layer-less portion 33 located outside the positive and negative electrodes 10 and 20 in a plan view. 34. Even in the packaged electrode 50 in the lithium ion secondary battery 1, since the warpage of the separator 30 can be suppressed as described above, the separators 30 can be easily adhered to each other, and the separators 30 can be bonded to each other. Becomes easier. As a result, it is possible to facilitate the manufacture of the packaged electrode 50 in which the positive electrode 10 is sandwiched between the two separators 30 and the lithium ion secondary battery 1 to which the sealed electrode 50 is applied. Furthermore, since the joining portion 34 is disposed outside the positive and negative electrodes 10 and 20 in a plan view, even if a joining failure occurs in the joining portion 34, an internal short circuit between the positive and negative electrodes 10 and 20. Can be reliably prevented.

  The negative electrode 20 has a larger projected area from the electrode thickness direction than the positive electrode 10. With this configuration, the joining portion 34 provided in the heat-resistant layer-less portion 33 is located further outside the negative electrode 20 that is larger than the positive electrode 10 in the bagging electrode 50, and therefore, the joining operation can be easily performed without interfering with the negative electrode 20. Can be done.

  In manufacturing the packaged electrode 50, two separators 30 provided with a heat-resistant layer 32 on one surface of the resin layer 31 as a base material are prepared, and the positive electrode 10 is sandwiched between the two separators 30, The two separators 30 are joined at the heat-resistant layer-less portion 33 outside the positive electrode 10 when viewed in plan. In the separator 30 provided with the heat-resistant layer-less portion 33, when the separator 30 is cut by heat, the heat-shrinkable-less portion 33 has a small difference in thermal shrinkage due to the difference in material and warps the separator 30. It is possible to suppress the occurrence of deformation. Since the warpage of the separator 30 is suppressed, the separators 30 can be easily adhered to each other, and the separators 30 can be easily joined. As a result, it is possible to facilitate the manufacture of the packaged electrode 50 in which the positive electrode 10 is sandwiched between the two separators 30.

(Modification)
The present invention is not limited to the above-described embodiment, and can be modified as appropriate.

  Although the embodiment using the separator 30 provided with the heat-resistant layer 32 on one surface of the resin layer 31 has been described, the present invention is applied to the separator 30 provided with the heat-resistant layer 32 on both surfaces of the resin layer 31. You can also.

  When the heat-resistant layer 32 is provided on one surface of the resin layer 31 of the separator 30, the resin layer 31 may be opposed to the positive electrode 10 and the heat-resistant layer 32 may be exposed to the outside. In addition, for one of the two separators 30, the heat-resistant layer 32 may be opposed to the positive electrode 10, and for the other separator 30, the packaged electrode 50 may be the resin layer 31 opposed to the positive electrode 10. it can.

  The laminated electric device 1 in which the positive electrode 10 is the packaged electrode 50 and the negative electrode 20 larger than the positive electrode 10 is stacked on the packaged electrode 50 has been described. Conversely, the negative electrode 20 is the packaged electrode 50. The stacked electric device 1 may be formed by stacking the positive electrode 10 larger than the negative electrode 20 on the packaged electrode 50. The multilayer electrical device 1 is not limited to a lithium ion secondary battery, and can be widely applied to capacitors and the like.

  Although the embodiment in which the resin layer 31 itself of the separator 30 is used as the joint portion 34 is illustrated, the present invention is not limited to this case. A molten resin material of the same type as the molten resin material constituting the resin layer 31 is applied to the heat-resistant layer-less portion 33, or a material different from the molten resin material constituting the resin layer 31 is applied to the heat-resistant layer-less portion 33. Thus, the joint 34 may be configured.

1 Lithium ion secondary battery (stacked electrical device),
10 positive electrode (first electrode),
20 negative electrode (second electrode),
30 separator,
31 resin layer,
32 heat-resistant layer,
33 Heat resistant layer-less part,
34 joints,
35 gap,
50 Packed electrodes,
710 Heating and pressing member.

Claims (8)

Two separators provided with a heat-resistant layer having a melting temperature higher than that of the resin layer on at least one surface of the resin layer;
An electrode sandwiched between two separators;
Two separators extend to the outside of the electrode in plan view on the side where the heat-resistant layer is provided, and the thickness of the heat-resistant layer is thinner than the portion sandwiching the electrode, or Zero heat-resistant layer-less part,
A packaged electrode comprising: a joining portion provided in the heat-resistant layer-less portion and joining the separators.   The packaged electrode according to claim 1, wherein the joint portion is provided on a peripheral edge facing each other among peripheral edges of the separator.   The packaged electrode according to claim 1, wherein the joint portion is formed of a molten resin material.   The packaged electrode according to claim 3, wherein the molten resin material is a material constituting the resin layer of the separator.   The packaged electrode according to any one of claims 1 to 4, wherein the joint portion extends continuously without a gap or is disposed intermittently with a gap. Two separators provided with a heat-resistant layer having a melting temperature higher than that of the resin layer on at least one surface of the resin layer;
A first electrode sandwiched between two separators;
A second electrode laminated on a side of the two separators not facing the first electrode;
Two separators extend to the outside of the first and second electrodes in a plan view on the side where the heat-resistant layer is provided, and the thickness of the heat-resistant layer is the same as that of the first electrode. A heat-resistant layer-less part that is thin or zero compared to the sandwiched part,
A laminated electric device comprising: a joining portion that is provided in a portion located outside the first and second electrodes in a plan view of the heat-resistant layer-less portion, and joins the separators. The stacked electric device according to claim 6, wherein the second electrode has a larger projected area from the electrode thickness direction than the first electrode. Preparing two separators provided with a heat-resistant layer having a melting temperature higher than that of the resin layer on at least one surface of a resin layer as a base material;
Sandwiching an electrode between the two separators,
A bag in which the two separators are joined to each other outside the electrode in a plan view and at a heat-resistant layer-less portion where the thickness of the heat-resistant layer is thinner or zero than the portion sandwiching the electrode A method for producing a packed electrode.

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