WO2017208509A1 - Power storage device and method for producing same - Google Patents

Power storage device and method for producing same Download PDF

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Publication number
WO2017208509A1
WO2017208509A1 PCT/JP2017/005428 JP2017005428W WO2017208509A1 WO 2017208509 A1 WO2017208509 A1 WO 2017208509A1 JP 2017005428 W JP2017005428 W JP 2017005428W WO 2017208509 A1 WO2017208509 A1 WO 2017208509A1
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WO
WIPO (PCT)
Prior art keywords
electrode
separator
storage device
electrodes
sides
Prior art date
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PCT/JP2017/005428
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French (fr)
Japanese (ja)
Inventor
徹 川合
大塚　正博
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株式会社村田製作所
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Publication of WO2017208509A1 publication Critical patent/WO2017208509A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/22—Electrodes
    • H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H01M50/466—U-shaped, bag-shaped or folded
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/52—Separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a power storage device and a manufacturing method thereof.
  • Patent Document 1 describes an example of a secondary battery that is not rectangular in plan view.
  • a first electrode that is not rectangular in plan view, a separator (separation film) that is not rectangular in plan view, and a second electrode that is not rectangular in plan view are in this order.
  • the secondary battery described in Patent Document 1 is a stacked secondary battery.
  • the main object of the present invention is to provide an inexpensive electricity storage device that is not rectangular in plan view.
  • the first power storage device includes a first electrode, a second electrode, a separator, and an electrolyte.
  • the first electrode has a rectangular first electrode body and a first electrode protrusion.
  • the first electrode protrusion protrudes from one end extending along one direction of the first electrode body in a direction different from the one direction.
  • the second electrode has a rectangular second electrode main body and a second electrode protrusion.
  • the second electrode body is stacked on the first electrode body.
  • the second electrode protrusion protrudes from one end extending along one direction of the second electrode main body in a direction different from the one direction.
  • the second electrode protrusion is stacked on the first electrode protrusion.
  • the separator is provided between at least one of the first and second electrodes and the electrodes located on both sides of the electrode.
  • the separator covers both sides in one direction of the first and second electrode bodies in the first region where the first electrode body and the second electrode body are laminated.
  • the separator does not cover one side or one side of the first and second electrode protrusions in the second region where the first electrode protrusions and the second electrode protrusions are stacked.
  • the electrolyte is impregnated in the separator.
  • the separator is provided between at least one of the first and second electrodes and the electrodes located on both sides of the electrode. For this reason, the number of separators can be reduced as compared with the case where a separate separator is provided between each of the first electrode and the second electrode. For example, the number of separators used in the electricity storage device can be one. Therefore, cost reduction of the electricity storage device can be achieved.
  • the separator provided between at least one of the first and second electrodes and the electrodes located on both sides of the electrode includes a portion located on one side of the electrode and the electrode. A portion located on the other side is connected. If it is going to insulate more 1st electrodes and 2nd electrodes with a small number of separators, the side surfaces of many electrodes will be covered with a separator. For this reason, at the time of charging / discharging of an electrical storage device, the flow of electrolyte is inhibited and the charge / discharge characteristics of the electrical storage device tend to be lowered.
  • the 1st electrical storage device of the present invention the 2nd field where the separator does not cover the both sides or one side of one direction of the 1st and 2nd electrode convex part is provided. For this reason, in the 1st electrical storage device which concerns on this invention, the flow of the electrolyte at the time of charging / discharging is hard to be inhibited. Accordingly, the first power storage device according to the present invention has excellent charge / discharge characteristics.
  • the first power storage device according to the present invention has excellent charge / discharge characteristics while being inexpensive.
  • the separator may be wound around the first and second electrode bodies in the first region.
  • a second power storage device includes a first electrode, a second electrode, a separator, and an electrolyte.
  • the first electrode has a rectangular first electrode body and a first electrode protrusion.
  • the first electrode protrusion protrudes from one end extending along one direction of the first electrode body in a direction different from the one direction.
  • the second electrode has a rectangular second electrode main body and a second electrode protrusion.
  • the second electrode body is stacked on the first electrode body.
  • the second electrode protrusion protrudes from one end extending along one direction of the second electrode main body in a direction different from the one direction.
  • the second electrode protrusion is stacked on the first electrode protrusion.
  • the separator is provided between at least one of the first and second electrodes and the electrodes located on both sides of the electrode.
  • the separator covers one side of at least one of the first and second electrode bodies in the first region where the first electrode body and the second electrode body are stacked.
  • the separator does not cover both sides in one direction of the first and second electrode protrusions in the second region where the first electrode protrusions and the second electrode protrusions are stacked.
  • the electrolyte is impregnated in the separator.
  • the separator is provided between at least one of the first and second electrodes and the electrodes located on both sides of the electrode. For this reason, the number of separators can be reduced as compared with the case where a separate separator is provided between each of the first electrode and the second electrode. For example, the number of separators used in the electricity storage device can be one. Therefore, cost reduction of the electricity storage device can be achieved.
  • the separator provided between at least one of the first and second electrodes and the electrodes located on both sides of the electrode includes a portion located on one side of the electrode and the electrode. A portion located on the other side is connected. If it is going to insulate more 1st electrodes and 2nd electrodes with a small number of separators, the side surfaces of many electrodes will be covered with a separator. For this reason, at the time of charging / discharging of an electrical storage device, the flow of electrolyte is inhibited and the charge / discharge characteristics of the electrical storage device tend to be lowered.
  • the second electricity storage device of the present invention a second region that does not cover both sides in one direction of the first and second electrode protrusions is provided. For this reason, in the 2nd electrical storage device which concerns on this invention, the flow of the electrolyte at the time of charging / discharging is hard to be inhibited. Therefore, the second electricity storage device according to the present invention has excellent charge / discharge characteristics.
  • the second power storage device has excellent charge / discharge characteristics while being inexpensive.
  • the separator may have a 99-fold shape that sandwiches the first and second electrode bodies in the first region.
  • the separator may be provided in a bag shape that accommodates the first or second electrode body in the first region.
  • the manufacturing method of the 1st electrical storage device of this invention is related with the method of manufacturing the 1st electrical storage device of this invention.
  • An electrode body having the first and second regions is formed by cutting off a part of the laminated body made only of the separator.
  • the first power storage device of the present invention can be preferably manufactured.
  • the second power storage device manufacturing method of the present invention relates to a method of manufacturing the second power storage device of the present invention.
  • An electrode body having first and second regions is formed by cutting off a part of the separator on one side in one direction of the laminate.
  • the second power storage device of the present invention can be preferably manufactured.
  • an inexpensive power storage device that is not rectangular in a plan view can be provided.
  • FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2. It is a schematic plan view of the positive electrode in 1st Embodiment. It is a typical top view of the negative electrode in a 1st embodiment. It is a typical perspective view of the electrode body in a 2nd embodiment.
  • FIG. 7 is a schematic cross-sectional view taken along line VII-VII in FIG. 6. It is a typical perspective view of the electrode body in 3rd Embodiment.
  • FIG. 9 is a schematic cross-sectional view taken along line IX-IX in FIG. 8. It is a typical perspective view of the electrode body in a 4th embodiment. It is typical sectional drawing in line XI-XI of FIG.
  • FIG. 1 is a schematic perspective view of the electricity storage device according to the first embodiment.
  • FIG. 2 is a schematic perspective view of the electrode body in the first embodiment.
  • 3 is a schematic cross-sectional view taken along line III-III in FIG.
  • a battery such as a secondary battery, a capacitor such as an electric double layer capacitor, or the like.
  • the electricity storage device 1 includes a case 2.
  • Case 2 has a non-rectangular shape in plan view.
  • the plan view shape of the case 2 may be, for example, an L shape, an H shape, a U shape, a T shape, or the like. That is, in the present invention, the case may have any shape as long as the shape in plan view is not rectangular.
  • Case 2 may be made of a conductor or may be made of an insulator.
  • the case 2 can be made of, for example, a metal such as aluminum, stainless steel, or copper, a laminate foil, a resin, or the like.
  • a first terminal 2 a and a second terminal 2 b are provided on one side of the case 2.
  • One of the first terminal 2a and the second terminal 2b constitutes a positive terminal, and the other constitutes a negative terminal.
  • only the positive electrode terminal may be provided, and the negative electrode terminal may be constituted by the conductive case 2.
  • the first terminal 2 a and the second terminal 2 b may be provided directly on the side surface of the case 2, or may be pulled out from the side surface of the case 2 by a tab.
  • the planar view shape of the electrode body 3 is a shape along the planar view shape of the case 2.
  • both the case 2 and the electrode body 3 are provided in an L shape.
  • the electrode body is provided in an H shape.
  • the case is U-shaped, the electrode body is provided in a U-shape.
  • the electrode body 3 includes a positive electrode 11, a negative electrode 12, and a separator 13.
  • the positive electrode 11 and the negative electrode 12 are opposed to each other through the separator 13.
  • the separator 13 separates the positive electrode 11 and the negative electrode 12 from each other and is insulated.
  • one of the first electrode and the second electrode constitutes a positive electrode, and the other constitutes a negative electrode.
  • the configuration of the positive electrode 11 can be appropriately determined depending on the type of the electricity storage device 1.
  • the positive electrode 11 can be configured by a positive electrode current collector and an active material layer provided on at least one surface of the positive electrode current collector.
  • the positive electrode 11 can be composed of a positive electrode current collector and a polarizable electrode layer provided on at least one surface of the positive electrode current collector. it can.
  • the configuration of the negative electrode 12 can be appropriately determined depending on the type of the electricity storage device 1.
  • the negative electrode 12 when the electricity storage device 1 is a secondary battery, the negative electrode 12 can be constituted by a negative electrode current collector and an active material layer provided on at least one surface of the negative electrode current collector.
  • the negative electrode 12 when the electricity storage device 1 is an electric double layer capacitor, the negative electrode 12 can be constituted by a negative electrode current collector and a polarizable electrode layer provided on at least one surface of the negative electrode current collector. it can.
  • the separator 13 can be constituted by, for example, a porous sheet having continuous pores in which ions in the electrolyte can move.
  • the separator 13 may be made of, for example, polypropylene, polyethylene, polyimide, cellulose, aramid, polyvinylidene fluoride, Teflon (registered trademark), or the like.
  • the surface of the separator 13 may be covered with a ceramic coat layer, an adhesive layer, or the like.
  • the surface of the separator 13 may have adhesiveness.
  • the separator 13 may be a single layer film made of one kind of material, or a composite film or a multilayer film made of one kind or two or more kinds of materials.
  • an insulating layer such as a ceramic coat layer may be provided on the surfaces of the positive electrode 11 and the negative electrode 12.
  • An undercoat layer containing carbon or the like may be provided between the current collectors of the positive electrode 11 and the negative electrode 12 and the active material layer.
  • the separator 13 is impregnated with an electrolyte.
  • the electrolyte includes a solute and a solvent.
  • a Li salt such as LiPF 6 or LiBF 4 is preferably used as the solute.
  • the solvent include ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) when the electricity storage device 1 is a secondary battery.
  • An organic solvent is preferably used.
  • the electrolyte may be a liquid or a polymer.
  • the electrode body 3 is L-shaped in plan view. Specifically, a planar view L-shaped positive electrode 11 that is not rectangular in plan view and a planar view L-shaped negative electrode 12 that is not rectangular in plan view are stacked.
  • the positive electrode 11 has a positive electrode body 11a and a positive electrode protrusion 11b.
  • the positive electrode body 11a has a rectangular shape.
  • the positive electrode convex portion 11b is a y-axis that is a direction different from the x-axis direction (typically, an orthogonal direction) from one end side 11a1 extending along the x-axis direction (one direction) of the positive electrode main body 11a. It protrudes in the direction.
  • the positive electrode protrusion 11b has a rectangular shape.
  • the shape of the positive electrode protrusion 11b is not particularly limited.
  • the positive electrode convex portion 11b may be, for example, a dome shape, a trapezoidal shape, a triangular shape, a parallelogram shape, a rhombus shape, a semicircular shape, or the like.
  • the shape of the positive electrode protrusion 11 b can be determined by the shape of the case 2.
  • the negative electrode 12 has a negative electrode body 12a and a negative electrode protrusion 12b.
  • One of the negative electrode main body 12a and the positive electrode main body 11a constitutes a first electrode main body, and the other constitutes a second electrode main body.
  • One of the negative electrode protrusion 12b and the positive electrode protrusion 11b forms a first electrode protrusion, and the other forms a second electrode protrusion.
  • the negative electrode body 12a has a rectangular shape.
  • the negative electrode main body 12a and the positive electrode main body 11a are stacked in the z-axis direction, which is the stacking direction, via the separator 13.
  • the negative electrode protrusion 12b extends from the end 12a1 extending along the x-axis direction (one direction) of the negative electrode body 12a in the y-axis direction, which is a direction different from the x-axis direction (typically, a perpendicular direction). Protrusively.
  • the negative electrode convex part 12b and the positive electrode convex part 11b are laminated
  • the negative electrode protrusion 12b has a rectangular shape.
  • the shape of the negative electrode protrusion 12b is not particularly limited.
  • the negative electrode protrusion 12b may be, for example, a dome shape, a trapezoidal shape, a triangular shape, a parallelogram shape, a rhombus shape, or a semicircular shape.
  • the shape of the negative electrode protrusion 12 b can be determined by the shape of the case 2.
  • the separator 13 is disposed between the positive electrode 11 and the negative electrode 12, and insulates the positive electrode 11 and the negative electrode 12.
  • the separator 13 includes a separator provided between at least one of the positive electrode 11 and the negative electrode 12 and electrodes located on both sides of the electrode.
  • the electrode body 3 has one separator 13.
  • the separator 13 is in the x-axis direction (one direction) of the first and second electrode main bodies 11a and 12a. It is provided so as to cover both sides. Specifically, the separator 13 is wound around the positive electrode body 11a and the negative electrode body 12a in the first region A1. In other words, in the first region A1, along the z-axis direction, which is the stacking direction, so that the positive electrode body 11a and the negative electrode body 12a face each other with the separator 13 in the wound separator 13. The separators 13 are alternately positioned between adjacent separators 13.
  • the second region A2 in which the positive electrode convex portion 11b and the negative electrode convex portion 12b are stacked as shown in FIG. 3, one side or both sides of the positive electrode convex portion 11b and the negative electrode convex portion 12b in the x-axis direction. Is not covered.
  • the second region A2 covers one side of the positive electrode convex portion 11b and the negative electrode convex portion 12b in the x-axis direction.
  • the separator 13 has a shape in which the other side of the wound separator 13 in the x-axis direction is cut off.
  • the positive electrode convex portion 11b protrudes from one end portion in the x-axis direction of one end side 11a1 of the positive electrode main body 11a, and the negative electrode convex portion 12b extends from the one end side 11a1 of the negative electrode main body 11a.
  • the example which protrudes from the one side edge part of a x-axis direction was demonstrated.
  • the present invention is not limited to this configuration.
  • the positive electrode convex part 11b protrudes from the middle part of the one end side 11a1 of the positive electrode body 11a in the x-axis direction
  • the negative electrode convex part 12b extends from the middle part of the one end side 11a1 of the negative electrode body 11a in the x-axis direction. It may be protruding.
  • the positive electrode may have a plurality of positive electrode protrusions.
  • the negative electrode may have a plurality of negative electrode protrusions.
  • a laminate including separators 13 covering both sides in the direction of is prepared.
  • the electrode body 3 having the first and second regions A1 and A2 is manufactured by cutting away a part of the laminated body made only from the separator 13.
  • the electrode body 3 is accommodated in the case 2, the positive electrode 11 and the positive electrode terminal 2a are electrically connected, and the negative electrode 12 and the negative electrode terminal 2b are electrically connected.
  • the separator 13 is impregnated with the electrolyte by filling the case 2 with the electrolyte.
  • the electricity storage device 1 can be manufactured through the above steps.
  • the separator 13 is provided between at least one of the positive electrode 11 and the negative electrode 12 and the electrodes located on both sides of the electrode. For this reason, the number of separators 13 can be reduced as compared with the case where separate separators are provided between the positive electrode and the negative electrode. Therefore, cost reduction of the electrical storage device 1 can be achieved.
  • the electricity storage device 1 has one separator 13. Therefore, further cost reduction of the electricity storage device 1 can be achieved.
  • the separator 13 In order to reduce the number of separators included in the electricity storage device, it is preferable to provide the separator 13 in a spiral shape (winding shape) like the electricity storage device 1.
  • the number of separators included in the electrode body is not necessarily one.
  • a plurality of electrode bodies 3 shown in FIG. 2 may be stacked in the z-axis direction and accommodated in the case.
  • a positive electrode 11 and a negative electrode 12 may be further laminated on the electrode body 3 shown in FIG. 2, and a sheet-like separator may be disposed between each of the positive electrode 11 and the negative electrode 12.
  • a nineteen-fold separator may be provided.
  • the 99-fold separator may be connected to the separator 13 shown in FIG.
  • the separator 13 provided between at least one of the positive electrode 11 and the negative electrode 12 and the electrode located on both sides of the electrode includes a portion located on one side of the electrode, A portion located on the other side is connected. If an attempt is made to insulate a larger number of positive electrodes 11 and negative electrodes 12 with a small number of separators, the side surfaces of many electrodes will be covered with the separators. For this reason, at the time of charging / discharging of an electrical storage device, the flow of electrolyte is inhibited and the charge / discharge characteristics of the electrical storage device tend to be lowered.
  • the second region A2 is provided in which the separator 13 does not cover one side of the positive electrode convex portion 11b and the negative electrode convex portion 12b in the x-axis direction (one direction). For this reason, in the electrical storage device 1, the flow of the electrolyte during charging / discharging is hardly inhibited. Therefore, the electricity storage device 1 has excellent charge / discharge characteristics.
  • the electricity storage device 1 has excellent charge / discharge characteristics while being inexpensive.
  • FIG. 6 is a schematic perspective view of an electrode body according to the second embodiment.
  • FIG. 7 is a schematic cross-sectional view taken along line VII-VII in FIG. Also, FIG. 1 is referred to in common with the first embodiment.
  • the electricity storage device according to the second embodiment differs from the electricity storage device 1 according to the first embodiment in the shape of the separator 13.
  • the separator 13 has at least one direction (x-axis direction) of the first and second electrode bodies 11a and 12a in the first region A1. It covers one side. Specifically, in the present embodiment, the separator 13 is provided in a ninety-nine fold shape in the first region A1. For this reason, the separator 13 covers one side of the positive electrode 11 in the x-axis direction, does not cover the other side, does not cover the one side of the negative electrode 12 in the x-axis direction, and covers the other side.
  • the separator 13 does not cover at least one side of one direction (x-axis direction) of the positive electrode convex portion 11b and the negative electrode convex portion 12b in the second region A2. Specifically, in the present embodiment, the separator 13 covers one side of the positive electrode 11 in the x-axis direction, but does not cover the other side. The separator 13 does not cover both sides of the negative electrode 12 in the x-axis direction.
  • the separator 13 is provided between at least one of the positive electrode 11 and the negative electrode 12 and the electrodes located on both sides of the electrode. For this reason, the number of separators 13 can be reduced as compared with the case where separate separators are provided between the positive electrode and the negative electrode. Therefore, cost reduction of the electricity storage device can be achieved.
  • the electricity storage device of the present embodiment has excellent charge / discharge characteristics.
  • the power storage device according to the second embodiment also has excellent charge / discharge characteristics while being inexpensive.
  • the power storage device according to the second embodiment can also be manufactured by a method substantially similar to the example of the manufacturing method described in the first embodiment, for example. Therefore, in 2nd Embodiment, the description of the manufacturing method of the electrical storage device in 1st Embodiment shall be used.
  • the negative electrode 12 provided between the positive electrode 11, the negative electrode 12, at least one of the positive electrode 11 and the negative electrode 12, and the electrodes located on both sides of the electrode, and A laminate including a separator 13 covering one side in one direction of at least one of the positive electrode 11 and the negative electrode 12 is prepared.
  • FIG. 8 is a schematic perspective view of an electrode body according to the third embodiment.
  • FIG. 9 is a schematic cross-sectional view taken along line IX-IX in FIG. Also, FIG. 1 is referred to in common with the first embodiment.
  • the separator 13 is in one direction (x-axis direction) of one of the first and second electrode bodies 11a and 12a in the first region A1. Covers one side.
  • the separator 13 is provided in a substantially U shape when viewed from the y-axis direction.
  • the negative electrode 12 is sandwiched between the separators 13. For this reason, the separator 13 does not cover both sides of the positive electrode 11 in the x-axis direction, and does not cover one side of the negative electrode 12 in the x-axis direction, but covers the other side.
  • the separator 13 does not cover both sides of the positive electrode convex portion 11b and the negative electrode convex portion 12b in the x-axis direction in the second region A2.
  • the separator 13 is provided between at least one of the positive electrode 11 and the negative electrode 12 and the electrodes located on both sides of the electrode. For this reason, the number of separators 13 can be reduced as compared with the case where separate separators are provided between the positive electrode and the negative electrode. Therefore, cost reduction of the electricity storage device can be achieved.
  • both sides of the positive electrode convex portion 11b and the negative electrode convex portion 12b in the x-axis direction are not covered with the separator 13. For this reason, in the electrical storage device of this embodiment, the flow of the electrolyte during charging and discharging is not easily inhibited. Therefore, the electricity storage device of the present embodiment has excellent charge / discharge characteristics.
  • the electricity storage device also has excellent charge / discharge characteristics while being inexpensive.
  • FIG. 10 is a schematic perspective view of an electrode body according to the fourth embodiment.
  • FIG. 11 is a schematic cross-sectional view taken along line XI-XI in FIG.
  • the separator 13 has a bag shape in which the positive electrode 11 is accommodated in the first region A1. For this reason, in the first region A1, the separator 13 covers both sides of one direction (x-axis direction) of the positive electrode 11. In the first region A1, the separator 13 does not cover both sides of the negative electrode 12 in the x-axis direction.
  • the separator 13 covers one side in the x-axis direction of the positive electrode convex portion 11b in the second region A2, but does not cover the other side.
  • the separator 13 is provided between at least one of the positive electrode 11 and the negative electrode 12 and the electrodes located on both sides of the electrode. For this reason, the number of separators 13 can be reduced as compared with the case where separate separators are provided between the positive electrode and the negative electrode. Therefore, cost reduction of the electricity storage device can be achieved.
  • the electricity storage device of the present embodiment has excellent charge / discharge characteristics.
  • the electricity storage device according to the fourth embodiment is also inexpensive and has excellent charge / discharge characteristics.

Abstract

Provided is an inexpensive power storage device which is not rectangular when seen from a planar view. A separator 13 covers both sides of a first electrode body 11 and a second electrode body 12 in one direction in a first region A1 where the first electrode body 11a and the second electrode body 12a are layered on one another. The separator 13 does not cover one or both sides of a first electrode projection 11b and a second electrode projection 12b in the one direction in a second region A2 where the first electrode projection 11b and the second electrode projection 12b are layered on one another.

Description

蓄電デバイス及びその製造方法Electric storage device and manufacturing method thereof
　本発明は、蓄電デバイス及びその製造方法に関する。 The present invention relates to a power storage device and a manufacturing method thereof.
　近年、電子機器の小型化や薄型化が進んでいる。このため、電子機器に搭載される蓄電デバイスの配置スペースに対する制約が厳しくなってきている。例えば、平面視において矩形状でない蓄電デバイスに対する要望もある。例えば、特許文献１には、平面視において矩形状でない二次電池の一例が記載されている。特許文献１に記載の二次電池では、平面視において矩形状でない第１の電極と、平面視において矩形状でないセパレータ（分離膜）と、平面視において矩形状でない第２の電極とがこの順番で積層されている。すなわち、特許文献１に記載の二次電池は、積層型の二次電池である。 In recent years, electronic devices are becoming smaller and thinner. For this reason, the restrictions with respect to the arrangement | positioning space of the electrical storage device mounted in an electronic device have become severe. For example, there is a demand for an electricity storage device that is not rectangular in plan view. For example, Patent Document 1 describes an example of a secondary battery that is not rectangular in plan view. In the secondary battery described in Patent Document 1, a first electrode that is not rectangular in plan view, a separator (separation film) that is not rectangular in plan view, and a second electrode that is not rectangular in plan view are in this order. Are stacked. That is, the secondary battery described in Patent Document 1 is a stacked secondary battery.
特表２０１５－５３６０３６号公報Special table 2015-536036 gazette
　近年、電子機器の低コスト化の要望が高まっているため、二次電池等の蓄電デバイスに対しても低コスト化の要望が高まってきている。 In recent years, there has been an increasing demand for cost reduction of electronic devices, and there has been an increasing demand for cost reduction of power storage devices such as secondary batteries.
　本発明の主な目的は、平面視において矩形状でない安価な蓄電デバイスを提供することにある。 The main object of the present invention is to provide an inexpensive electricity storage device that is not rectangular in plan view.
　本発明に係る第１の蓄電デバイスは、第１の電極と、第２の電極と、セパレータと、電解質とを備えている。第１の電極は、矩形状の第１の電極本体と、第１の電極凸部とを有する。第１の電極凸部は、第１の電極本体の一の方向に沿って延びる一の端辺から一の方向とは異なる方向に向かって突出している。第２の電極は、矩形状の第２の電極本体と、第２の電極凸部とを有する。第２の電極本体は、第１の電極本体に積層されている。第２の電極凸部は、第２の電極本体の一の方向に沿って延びる一の端辺から一の方向とは異なる方向に向かって突出している。第２の電極凸部は、第１の電極凸部に積層されている。セパレータは、第１及び第２の電極のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられている。セパレータは、第１の電極本体と第２の電極本体とが積層された第１の領域において第１及び第２の電極本体の一の方向における両側を覆っている。セパレータは、第１の電極凸部と第２の電極凸部とが積層された第２の領域において第１及び第２の電極凸部の一の方向の両側又は片側を覆っていない。電解質は、セパレータに含浸している。 The first power storage device according to the present invention includes a first electrode, a second electrode, a separator, and an electrolyte. The first electrode has a rectangular first electrode body and a first electrode protrusion. The first electrode protrusion protrudes from one end extending along one direction of the first electrode body in a direction different from the one direction. The second electrode has a rectangular second electrode main body and a second electrode protrusion. The second electrode body is stacked on the first electrode body. The second electrode protrusion protrudes from one end extending along one direction of the second electrode main body in a direction different from the one direction. The second electrode protrusion is stacked on the first electrode protrusion. The separator is provided between at least one of the first and second electrodes and the electrodes located on both sides of the electrode. The separator covers both sides in one direction of the first and second electrode bodies in the first region where the first electrode body and the second electrode body are laminated. The separator does not cover one side or one side of the first and second electrode protrusions in the second region where the first electrode protrusions and the second electrode protrusions are stacked. The electrolyte is impregnated in the separator.
　本発明に係る第１の蓄電デバイスでは、セパレータは、第１及び第２の電極のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられている。このため、第１の電極と第２の電極との間のそれぞれに別個のセパレータを配する場合と比較して、セパレータの枚数を減らすことができる。例えば、蓄電デバイスに用いるセパレータの枚数を１枚にすることも可能である。従って、蓄電デバイスの低コスト化を図ることができる。 In the first electricity storage device according to the present invention, the separator is provided between at least one of the first and second electrodes and the electrodes located on both sides of the electrode. For this reason, the number of separators can be reduced as compared with the case where a separate separator is provided between each of the first electrode and the second electrode. For example, the number of separators used in the electricity storage device can be one. Therefore, cost reduction of the electricity storage device can be achieved.
　ところで、第１及び第２の電極のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられているセパレータは、当該電極の一方側に位置する部分と、当該電極の他方側に位置する部分とが接続されている。少ない枚数のセパレータで、より多くの第１の電極と第２の電極とを絶縁しようとすると、多くの電極の側面がセパレータで覆われることとなる。このため、蓄電デバイスの充放電時に、電解質の流動が阻害され、蓄電デバイスの充放電特性が低くなる傾向にある。 By the way, the separator provided between at least one of the first and second electrodes and the electrodes located on both sides of the electrode includes a portion located on one side of the electrode and the electrode. A portion located on the other side is connected. If it is going to insulate more 1st electrodes and 2nd electrodes with a small number of separators, the side surfaces of many electrodes will be covered with a separator. For this reason, at the time of charging / discharging of an electrical storage device, the flow of electrolyte is inhibited and the charge / discharge characteristics of the electrical storage device tend to be lowered.
　それに対して、本発明の第１の蓄電デバイスでは、セパレータが第１及び第２の電極凸部の一の方向の両側又は片側を覆っていない第２の領域が設けられている。このため、本発明に係る第１の蓄電デバイスでは、充放電時における電解質の流動が阻害されにくい。従って、本発明に係る第１の蓄電デバイスは、優れた充放電特性を有している。 On the other hand, in the 1st electrical storage device of the present invention, the 2nd field where the separator does not cover the both sides or one side of one direction of the 1st and 2nd electrode convex part is provided. For this reason, in the 1st electrical storage device which concerns on this invention, the flow of the electrolyte at the time of charging / discharging is hard to be inhibited. Accordingly, the first power storage device according to the present invention has excellent charge / discharge characteristics.
　以上のように、本発明に係る第１の蓄電デバイスは、安価でありつつ、優れた充放電特性を有している。 As described above, the first power storage device according to the present invention has excellent charge / discharge characteristics while being inexpensive.
　本発明に係る第１の蓄電デバイスでは、セパレータは、第１の領域において第１及び第２の電極本体を周回するように巻回されていてもよい。 In the first electricity storage device according to the present invention, the separator may be wound around the first and second electrode bodies in the first region.
　本発明に係る第２の蓄電デバイスは、第１の電極と、第２の電極と、セパレータと、電解質とを備えている。第１の電極は、矩形状の第１の電極本体と、第１の電極凸部とを有する。第１の電極凸部は、第１の電極本体の一の方向に沿って延びる一の端辺から一の方向とは異なる方向に向かって突出している。第２の電極は、矩形状の第２の電極本体と、第２の電極凸部とを有する。第２の電極本体は、第１の電極本体に積層されている。第２の電極凸部は、第２の電極本体の一の方向に沿って延びる一の端辺から一の方向とは異なる方向に向かって突出している。第２の電極凸部は、第１の電極凸部に積層されている。セパレータは、第１及び第２の電極のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられている。セパレータは、第１の電極本体と第２の電極本体とが積層された第１の領域において、第１及び第２の電極本体の少なくとも一方の一の方向における一方側を覆っている。セパレータは、第１の電極凸部と第２の電極凸部とが積層された第２の領域において第１及び第２の電極凸部の一の方向の両側を覆っていない。電解質は、セパレータに含浸している。 A second power storage device according to the present invention includes a first electrode, a second electrode, a separator, and an electrolyte. The first electrode has a rectangular first electrode body and a first electrode protrusion. The first electrode protrusion protrudes from one end extending along one direction of the first electrode body in a direction different from the one direction. The second electrode has a rectangular second electrode main body and a second electrode protrusion. The second electrode body is stacked on the first electrode body. The second electrode protrusion protrudes from one end extending along one direction of the second electrode main body in a direction different from the one direction. The second electrode protrusion is stacked on the first electrode protrusion. The separator is provided between at least one of the first and second electrodes and the electrodes located on both sides of the electrode. The separator covers one side of at least one of the first and second electrode bodies in the first region where the first electrode body and the second electrode body are stacked. The separator does not cover both sides in one direction of the first and second electrode protrusions in the second region where the first electrode protrusions and the second electrode protrusions are stacked. The electrolyte is impregnated in the separator.
　本発明に係る第２の蓄電デバイスでは、セパレータは、第１及び第２の電極のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられている。このため、第１の電極と第２の電極との間のそれぞれに別個のセパレータを配する場合と比較して、セパレータの枚数を減らすことができる。例えば、蓄電デバイスに用いるセパレータの枚数を１枚にすることも可能である。従って、蓄電デバイスの低コスト化を図ることができる。 In the second electricity storage device according to the present invention, the separator is provided between at least one of the first and second electrodes and the electrodes located on both sides of the electrode. For this reason, the number of separators can be reduced as compared with the case where a separate separator is provided between each of the first electrode and the second electrode. For example, the number of separators used in the electricity storage device can be one. Therefore, cost reduction of the electricity storage device can be achieved.
　ところで、第１及び第２の電極のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられているセパレータは、当該電極の一方側に位置する部分と、当該電極の他方側に位置する部分とが接続されている。少ない枚数のセパレータで、より多くの第１の電極と第２の電極とを絶縁しようとすると、多くの電極の側面がセパレータで覆われることとなる。このため、蓄電デバイスの充放電時に、電解質の流動が阻害され、蓄電デバイスの充放電特性が低くなる傾向にある。 By the way, the separator provided between at least one of the first and second electrodes and the electrodes located on both sides of the electrode includes a portion located on one side of the electrode and the electrode. A portion located on the other side is connected. If it is going to insulate more 1st electrodes and 2nd electrodes with a small number of separators, the side surfaces of many electrodes will be covered with a separator. For this reason, at the time of charging / discharging of an electrical storage device, the flow of electrolyte is inhibited and the charge / discharge characteristics of the electrical storage device tend to be lowered.
　それに対して、本発明の第２の蓄電デバイスでは、第１及び第２の電極凸部の一の方向の両側を覆っていない第２の領域が設けられている。このため、本発明に係る第２の蓄電デバイスでは、充放電時における電解質の流動が阻害されにくい。従って、本発明に係る第２の蓄電デバイスは、優れた充放電特性を有している。 On the other hand, in the second electricity storage device of the present invention, a second region that does not cover both sides in one direction of the first and second electrode protrusions is provided. For this reason, in the 2nd electrical storage device which concerns on this invention, the flow of the electrolyte at the time of charging / discharging is hard to be inhibited. Therefore, the second electricity storage device according to the present invention has excellent charge / discharge characteristics.
　以上のように、本発明に係る第２の蓄電デバイスは、安価でありつつ、優れた充放電特性を有している。 As described above, the second power storage device according to the present invention has excellent charge / discharge characteristics while being inexpensive.
　本発明に係る第１及び第２の蓄電デバイスのそれぞれでは、セパレータが、第１の領域において第１及び第２の電極本体を狭持する九十九折状であってもよい。 In each of the first and second power storage devices according to the present invention, the separator may have a 99-fold shape that sandwiches the first and second electrode bodies in the first region.
　本発明に係る第１及び第２の蓄電デバイスのそれぞれでは、セパレータが、第１の領域において第１又は第２の電極体を収容する袋状に設けられていてもよい。 In each of the first and second power storage devices according to the present invention, the separator may be provided in a bag shape that accommodates the first or second electrode body in the first region.
　本発明の第１の蓄電デバイスの製造方法は、本発明の第１の蓄電デバイスを製造する方法に関する。本発明の第１の蓄電デバイスの製造方法では、第１の電極と、第２の電極と、第１及び第２の電極のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられており、かつ、第１及び第２の電極の一の方向における両側を覆っているセパレータを含む積層体を用意する。積層体のセパレータのみからなる一部分を切除することにより、第１及び第２の領域を有する電極体を形成する。 The manufacturing method of the 1st electrical storage device of this invention is related with the method of manufacturing the 1st electrical storage device of this invention. In the first method for manufacturing an electricity storage device of the present invention, the first electrode, the second electrode, at least one of the first and second electrodes, and electrodes positioned on both sides of the electrode, And a laminate including a separator that is provided between the two electrodes and covers both sides of the first and second electrodes in one direction. An electrode body having the first and second regions is formed by cutting off a part of the laminated body made only of the separator.
　本発明に係る第１の蓄電デバイスの製造方法によれば、本発明の第１の蓄電デバイスを好適に製造することができる。 According to the first power storage device manufacturing method of the present invention, the first power storage device of the present invention can be preferably manufactured.
　本発明の第２の蓄電デバイスの製造方法は、本発明の第２の蓄電デバイスを製造する方法に関する。本発明の第２の蓄電デバイスの製造方法では、第１の電極と、第２の電極と、第１及び第２の電極のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられており、かつ、第１及び第２の電極の少なくとも一方の一の方向における一方側を覆っているセパレータを含む積層体を用意する。積層体の一の方向における一方側部分のセパレータの一部分を切除することにより、第１及び第２の領域を有する電極体を形成する。 The second power storage device manufacturing method of the present invention relates to a method of manufacturing the second power storage device of the present invention. In the second method for manufacturing an electricity storage device of the present invention, the first electrode, the second electrode, at least one of the first and second electrodes, and electrodes positioned on both sides of the electrode, And a laminated body including a separator that covers one side in one direction of at least one of the first and second electrodes. An electrode body having first and second regions is formed by cutting off a part of the separator on one side in one direction of the laminate.
　本発明に係る第２の蓄電デバイスの製造方法によれば、本発明の第２の蓄電デバイスを好適に製造することができる。 According to the second power storage device manufacturing method of the present invention, the second power storage device of the present invention can be preferably manufactured.
　本発明によれば、平面視において矩形状でない安価な蓄電デバイスを提供することができる。 According to the present invention, an inexpensive power storage device that is not rectangular in a plan view can be provided.
第１の実施形態に係る蓄電デバイスの模式的斜視図である。It is a typical perspective view of the electrical storage device concerning a 1st embodiment. 第１の実施形態における電極体の模式的斜視図である。It is a typical perspective view of the electrode body in a 1st embodiment. 図２の線ＩＩＩ―ＩＩＩにおける模式的断面図である。FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2. 第１の実施形態における正極の模式的平面図である。It is a schematic plan view of the positive electrode in 1st Embodiment. 第１の実施形態における負極の模式的平面図である。It is a typical top view of the negative electrode in a 1st embodiment. 第２の実施形態における電極体の模式的斜視図である。It is a typical perspective view of the electrode body in a 2nd embodiment. 図６の線ＶＩＩ―ＶＩＩにおける模式的断面図である。FIG. 7 is a schematic cross-sectional view taken along line VII-VII in FIG. 6. 第３の実施形態における電極体の模式的斜視図である。It is a typical perspective view of the electrode body in 3rd Embodiment. 図８の線ＩＸ―ＩＸにおける模式的断面図である。FIG. 9 is a schematic cross-sectional view taken along line IX-IX in FIG. 8. 第４の実施形態における電極体の模式的斜視図である。It is a typical perspective view of the electrode body in a 4th embodiment. 図１０の線ＸＩ―ＸＩにおける模式的断面図である。It is typical sectional drawing in line XI-XI of FIG.
　以下、本発明を実施した好ましい形態の一例について説明する。但し、下記の実施形態は、単なる例示である。本発明は、下記の実施形態に何ら限定されない。 Hereinafter, an example of a preferable embodiment in which the present invention is implemented will be described. However, the following embodiment is merely an example. The present invention is not limited to the following embodiments.
　また、実施形態等において参照する各図面において、実質的に同一の機能を有する部材は同一の符号で参照することとする。また、実施形態等において参照する図面は、模式的に記載されたものである。図面に描画された物体の寸法の比率などは、現実の物体の寸法の比率などとは異なる場合がある。図面相互間においても、物体の寸法比率等が異なる場合がある。具体的な物体の寸法比率等は、以下の説明を参酌して判断されるべきである。 In each drawing referred to in the embodiment and the like, members having substantially the same function are referred to by the same reference numerals. The drawings referred to in the embodiments and the like are schematically described. A ratio of dimensions of an object drawn in a drawing may be different from a ratio of dimensions of an actual object. The dimensional ratio of the object may be different between the drawings. The specific dimensional ratio of the object should be determined in consideration of the following description.
　（第１の実施形態）
　図１は、第１の実施形態に係る蓄電デバイスの模式的斜視図である。図２は、第１の実施形態における電極体の模式的斜視図である。図３は、図２の線ＩＩＩ―ＩＩＩにおける模式的断面図である。 (First embodiment)
FIG. 1 is a schematic perspective view of the electricity storage device according to the first embodiment. FIG. 2 is a schematic perspective view of the electrode body in the first embodiment. 3 is a schematic cross-sectional view taken along line III-III in FIG.
　図１に示す蓄電デバイス１は、例えば、二次電池等の電池、電気二重層コンデンサ等のコンデンサ等であってもよい。 1 may be, for example, a battery such as a secondary battery, a capacitor such as an electric double layer capacitor, or the like.
　図１に示すように、蓄電デバイス１は、ケース２を備えている。ケース２は、平面視において、矩形状ではない形状を有している。ケース２の平面視形状は、例えば、Ｌ字状、Ｈ字状、Ｕ字状、Ｔ字状等であってもよい。すなわち、本発明において、ケースは、平面視形状が矩形状でない形状のものであれば、どのような形状のものであってもよい。 As shown in FIG. 1, the electricity storage device 1 includes a case 2. Case 2 has a non-rectangular shape in plan view. The plan view shape of the case 2 may be, for example, an L shape, an H shape, a U shape, a T shape, or the like. That is, in the present invention, the case may have any shape as long as the shape in plan view is not rectangular.
　ケース２は、導電体により構成されていても良いし、絶縁体により構成されていても良い。ケース２は、例えば、アルミニウム、ステンレス、銅等の金属や、ラミネート箔や樹脂等により構成することができる。 Case 2 may be made of a conductor or may be made of an insulator. The case 2 can be made of, for example, a metal such as aluminum, stainless steel, or copper, a laminate foil, a resin, or the like.
　ケース２の一側面には、第１の端子２ａと、第２の端子２ｂとが設けられている。第１の端子２ａと第２の端子２ｂとのうちの一方が、正極端子を構成しており、他方が負極端子を構成している。もっとも、本発明において、正極端子と負極端子との両方が設けられている必要は必ずしもない。例えば、正極端子のみを設け、負極端子を導電体のケース２により構成してもよい。第１の端子２ａと第２の端子２ｂはケース２の側面に直接設けられていてもよいし、ケース２の側面からタブにより引き出されていてもよい。 A first terminal 2 a and a second terminal 2 b are provided on one side of the case 2. One of the first terminal 2a and the second terminal 2b constitutes a positive terminal, and the other constitutes a negative terminal. However, in the present invention, it is not always necessary to provide both the positive terminal and the negative terminal. For example, only the positive electrode terminal may be provided, and the negative electrode terminal may be constituted by the conductive case 2. The first terminal 2 a and the second terminal 2 b may be provided directly on the side surface of the case 2, or may be pulled out from the side surface of the case 2 by a tab.
　ケース２の内部には、図２に示す電極体３が配されている。電極体３の平面視形状は、ケース２の平面視形状に沿った形状である。具体的には、本実施形態では、ケース２及び電極体３の両方が、Ｌ字状に設けられている。例えば、ケースがＨ字状である場合は、電極体は、Ｈ字状に設けられる。ケースがＵ字状である場合には、電極体は、Ｕ字状に設けられる。 2 In the case 2, an electrode body 3 shown in FIG. The planar view shape of the electrode body 3 is a shape along the planar view shape of the case 2. Specifically, in this embodiment, both the case 2 and the electrode body 3 are provided in an L shape. For example, when the case has an H shape, the electrode body is provided in an H shape. When the case is U-shaped, the electrode body is provided in a U-shape.
　電極体３は、正極１１と、負極１２と、セパレータ１３とを有する。正極１１と負極１２とは、セパレータ１３を介して対向している。このセパレータ１３により正極１１と負極１２とが隔離され、絶縁されている。 The electrode body 3 includes a positive electrode 11, a negative electrode 12, and a separator 13. The positive electrode 11 and the negative electrode 12 are opposed to each other through the separator 13. The separator 13 separates the positive electrode 11 and the negative electrode 12 from each other and is insulated.
　本発明においては、第１の電極と第２の電極とのうちの一方が正極を構成しており、他方が負極を構成している。 In the present invention, one of the first electrode and the second electrode constitutes a positive electrode, and the other constitutes a negative electrode.
　正極１１の構成は、蓄電デバイス１の種類によって適宜決定することができる。例えば、蓄電デバイス１が二次電池である場合は、正極１１は、正極集電体と、正極集電体の少なくとも一方面の上に設けられた活物質層とにより構成することができる。例えば、蓄電デバイス１が、電気二重層コンデンサである場合は、正極１１は、正極集電体と、正極集電体の少なくとも一方面の上に設けられた分極性電極層とにより構成することができる。 The configuration of the positive electrode 11 can be appropriately determined depending on the type of the electricity storage device 1. For example, when the electricity storage device 1 is a secondary battery, the positive electrode 11 can be configured by a positive electrode current collector and an active material layer provided on at least one surface of the positive electrode current collector. For example, when the electricity storage device 1 is an electric double layer capacitor, the positive electrode 11 can be composed of a positive electrode current collector and a polarizable electrode layer provided on at least one surface of the positive electrode current collector. it can.
　負極１２の構成は、蓄電デバイス１の種類によって適宜決定することができる。例えば、蓄電デバイス１が二次電池である場合は、負極１２は、負極集電体と、負極集電体の少なくとも一方面の上に設けられた活物質層とにより構成することができる。例えば、蓄電デバイス１が、電気二重層コンデンサである場合は、負極１２は、負極集電体と、負極集電体の少なくとも一方面の上に設けられた分極性電極層とにより構成することができる。 The configuration of the negative electrode 12 can be appropriately determined depending on the type of the electricity storage device 1. For example, when the electricity storage device 1 is a secondary battery, the negative electrode 12 can be constituted by a negative electrode current collector and an active material layer provided on at least one surface of the negative electrode current collector. For example, when the electricity storage device 1 is an electric double layer capacitor, the negative electrode 12 can be constituted by a negative electrode current collector and a polarizable electrode layer provided on at least one surface of the negative electrode current collector. it can.
　セパレータ１３は、例えば、電解質中のイオンが移動可能な連続気孔を有する多孔質シートにより構成することができる。セパレータ１３は、例えば、ポリプロピレン、ポリエチレン、ポリイミド、セルロース、アラミド、ポリフッ化ビニリデン、テフロン（登録商標）等により構成されていてもよい。また、セパレータ１３の表面がセラミックコート層や接着層等により覆われていてもよい。セパレータ１３の表面が接着性を有していてもよい。また、セパレータ１３は１種の材料からなる単層膜であってもよく、１種または２種類以上の材料からなる複合膜または多層膜であってもよい。 The separator 13 can be constituted by, for example, a porous sheet having continuous pores in which ions in the electrolyte can move. The separator 13 may be made of, for example, polypropylene, polyethylene, polyimide, cellulose, aramid, polyvinylidene fluoride, Teflon (registered trademark), or the like. Moreover, the surface of the separator 13 may be covered with a ceramic coat layer, an adhesive layer, or the like. The surface of the separator 13 may have adhesiveness. The separator 13 may be a single layer film made of one kind of material, or a composite film or a multilayer film made of one kind or two or more kinds of materials.
　また、セパレータ１３を設けない代わりに、若しくは、セパレータ１３を設けると共に、正極１１，負極１２の表面の上にセラミックコート層等の絶縁層を設けてもよい。 Alternatively, instead of providing the separator 13, or while providing the separator 13, an insulating layer such as a ceramic coat layer may be provided on the surfaces of the positive electrode 11 and the negative electrode 12.
　なお、正極１１，負極１２の集電体と活物質層との間にカーボン等を含むアンダーコート層を設けてもよい。 An undercoat layer containing carbon or the like may be provided between the current collectors of the positive electrode 11 and the negative electrode 12 and the active material layer.
　セパレータ１３には、電解質が含浸している。電解質は溶質と溶媒を含む。溶質には、例えば、蓄電デバイス１が二次電池である場合は、ＬｉＰＦ６やＬｉＢＦ４などのＬｉ塩が好ましく用いられる。溶媒には、例えば、蓄電デバイス１が二次電池である場合は、エチレンカーボネート（ＥＣ）、プロピレンカーボネート（ＰＣ）、ジメチルカーボネート（ＤＭＣ）、エチルメチルカーボネート（ＥＭＣ）、ジエチルカーボネート（ＤＥＣ）などの有機溶媒が好ましく用いられる。電解質は液体でもよいし、ポリマー状のものを用いてもよい。 The separator 13 is impregnated with an electrolyte. The electrolyte includes a solute and a solvent. For example, when the electricity storage device 1 is a secondary battery, a Li salt such as LiPF 6 or LiBF 4 is preferably used as the solute. Examples of the solvent include ethylene carbonate (EC), propylene carbonate (PC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) when the electricity storage device 1 is a secondary battery. An organic solvent is preferably used. The electrolyte may be a liquid or a polymer.
　図２に示すように、本実施形態では、電極体３は、平面視Ｌ字状である。具体的には、平面視が矩形状でない平面視Ｌ字状の正極１１と、平面視が矩形状でない平面視Ｌ字状の負極１２とが積層されている。 As shown in FIG. 2, in this embodiment, the electrode body 3 is L-shaped in plan view. Specifically, a planar view L-shaped positive electrode 11 that is not rectangular in plan view and a planar view L-shaped negative electrode 12 that is not rectangular in plan view are stacked.
　図４に示すように、正極１１は、正極本体１１ａと、正極凸部１１ｂとを有する。正極本体１１ａは、矩形状である。正極凸部１１ｂは、正極本体１１ａのｘ軸方向（一の方向）に沿って延びる一の端辺１１ａ１から、ｘ軸方向とは異なる方向（典型的には，直交する方向）であるｙ軸方向に向かって突出している。本実施形態においては、正極凸部１１ｂは、矩形状である。但し、本発明において、正極凸部１１ｂの形状は、特に限定されない。正極凸部１１ｂは、例えば、ドーム状、台形状、三角形状、平行四辺形状、菱形状、半円状等であってもよい。正極凸部１１ｂの形状は、ケース２の形状によって決定することができる。 As shown in FIG. 4, the positive electrode 11 has a positive electrode body 11a and a positive electrode protrusion 11b. The positive electrode body 11a has a rectangular shape. The positive electrode convex portion 11b is a y-axis that is a direction different from the x-axis direction (typically, an orthogonal direction) from one end side 11a1 extending along the x-axis direction (one direction) of the positive electrode main body 11a. It protrudes in the direction. In the present embodiment, the positive electrode protrusion 11b has a rectangular shape. However, in the present invention, the shape of the positive electrode protrusion 11b is not particularly limited. The positive electrode convex portion 11b may be, for example, a dome shape, a trapezoidal shape, a triangular shape, a parallelogram shape, a rhombus shape, a semicircular shape, or the like. The shape of the positive electrode protrusion 11 b can be determined by the shape of the case 2.
　図５に示すように、負極１２は、負極本体１２ａと、負極凸部１２ｂとを有する。負極本体１２ａと正極本体１１ａとのうちの一方が、第１の電極本体を構成しており、他方が、第２の電極本体を構成している。負極凸部１２ｂと正極凸部１１ｂとのうちの一方が、第１の電極凸部を形成しており、他方が、第２の電極凸部を構成している。 As shown in FIG. 5, the negative electrode 12 has a negative electrode body 12a and a negative electrode protrusion 12b. One of the negative electrode main body 12a and the positive electrode main body 11a constitutes a first electrode main body, and the other constitutes a second electrode main body. One of the negative electrode protrusion 12b and the positive electrode protrusion 11b forms a first electrode protrusion, and the other forms a second electrode protrusion.
　負極本体１２ａは、矩形状である。負極本体１２ａと正極本体１１ａとは、セパレータ１３を介して、積層方向であるｚ軸方向に積層されている。 The negative electrode body 12a has a rectangular shape. The negative electrode main body 12a and the positive electrode main body 11a are stacked in the z-axis direction, which is the stacking direction, via the separator 13.
　負極凸部１２ｂは、負極本体１２ａのｘ軸方向（一の方向）に沿って延びる端辺１２ａ１から、ｘ軸方向とは異なる方向（典型的には、直交する方向）であるｙ軸方向に向かって突出している。負極凸部１２ｂと正極凸部１１ｂとは、セパレータ１３を介して、積層方向であるｚ軸方向に積層されている。 The negative electrode protrusion 12b extends from the end 12a1 extending along the x-axis direction (one direction) of the negative electrode body 12a in the y-axis direction, which is a direction different from the x-axis direction (typically, a perpendicular direction). Protrusively. The negative electrode convex part 12b and the positive electrode convex part 11b are laminated | stacked on the z-axis direction which is a lamination direction via the separator 13. As shown in FIG.
　本実施形態においては、負極凸部１２ｂは、矩形状である。但し、本発明において、負極凸部１２ｂの形状は、特に限定されない。負極凸部１２ｂは、例えば、ドーム状、台形状、三角形状、平行四辺形状、菱形状、半円状等であってもよい。負極凸部１２ｂの形状は、ケース２の形状によって決定することができる。 In the present embodiment, the negative electrode protrusion 12b has a rectangular shape. However, in the present invention, the shape of the negative electrode protrusion 12b is not particularly limited. The negative electrode protrusion 12b may be, for example, a dome shape, a trapezoidal shape, a triangular shape, a parallelogram shape, a rhombus shape, or a semicircular shape. The shape of the negative electrode protrusion 12 b can be determined by the shape of the case 2.
　上述のように、セパレータ１３は、正極１１と負極１２との間に配されており、正極１１と負極１２とを絶縁している。セパレータ１３は、正極１１及び負極１２のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられたセパレータを含む。具体的には、本実施形態では、電極体３は、１枚のセパレータ１３を有する。 As described above, the separator 13 is disposed between the positive electrode 11 and the negative electrode 12, and insulates the positive electrode 11 and the negative electrode 12. The separator 13 includes a separator provided between at least one of the positive electrode 11 and the negative electrode 12 and electrodes located on both sides of the electrode. Specifically, in the present embodiment, the electrode body 3 has one separator 13.
　セパレータ１３は、正極本体１１ａと負極本体１２ａとが積層された第１の領域Ａ１（図２を参照）においては、第１及び第２の電極本体１１ａ、１２ａのｘ軸方向（一の方向）における両側を覆うように設けられている。具体的には、セパレータ１３は、第１の領域Ａ１において、正極本体１１ａ及び負極本体１２ａを周回するように巻回されている。換言すれば、第１の領域Ａ１においては、巻回されたセパレータ１３内に、正極本体１１ａと負極本体１２ａとがセパレータ１３を介して対向するように、積層方向であるｚ軸方向に沿って隣接するセパレータ１３間に交互に位置している。 In the first region A1 (see FIG. 2) where the positive electrode main body 11a and the negative electrode main body 12a are stacked, the separator 13 is in the x-axis direction (one direction) of the first and second electrode main bodies 11a and 12a. It is provided so as to cover both sides. Specifically, the separator 13 is wound around the positive electrode body 11a and the negative electrode body 12a in the first region A1. In other words, in the first region A1, along the z-axis direction, which is the stacking direction, so that the positive electrode body 11a and the negative electrode body 12a face each other with the separator 13 in the wound separator 13. The separators 13 are alternately positioned between adjacent separators 13.
　一方、正極凸部１１ｂと負極凸部１２ｂとが積層された第２の領域Ａ２においては、図３に示すように、正極凸部１１ｂと負極凸部１２ｂとのｘ軸方向の一方側又は両側を覆っていない。具体的には、本実施形態では、第２の領域Ａ２においては、正極凸部１１ｂと負極凸部１２ｂとのｘ軸方向の一方側を覆っている。第２の領域Ａ２においては、セパレータ１３は、巻回されたセパレータ１３のｘ軸方向の他方側が切除された形状を有している。 On the other hand, in the second region A2 in which the positive electrode convex portion 11b and the negative electrode convex portion 12b are stacked, as shown in FIG. 3, one side or both sides of the positive electrode convex portion 11b and the negative electrode convex portion 12b in the x-axis direction. Is not covered. Specifically, in the present embodiment, the second region A2 covers one side of the positive electrode convex portion 11b and the negative electrode convex portion 12b in the x-axis direction. In the second region A2, the separator 13 has a shape in which the other side of the wound separator 13 in the x-axis direction is cut off.
　なお、本実施形態では、正極凸部１１ｂが正極本体１１ａの一の端辺１１ａ１のｘ軸方向の一方側端部から突出しており、負極凸部１２ｂが負極本体１１ａの一の端辺１１ａ１のｘ軸方向の一方側端部から突出している例について説明した。但し、本発明は、この構成に限定されない。例えば、正極凸部１１ｂが正極本体１１ａの一の端辺１１ａ１のｘ軸方向の途中部から突出しており、負極凸部１２ｂが負極本体１１ａの一の端辺１１ａ１のｘ軸方向の途中部から突出していてもよい。 In the present embodiment, the positive electrode convex portion 11b protrudes from one end portion in the x-axis direction of one end side 11a1 of the positive electrode main body 11a, and the negative electrode convex portion 12b extends from the one end side 11a1 of the negative electrode main body 11a. The example which protrudes from the one side edge part of a x-axis direction was demonstrated. However, the present invention is not limited to this configuration. For example, the positive electrode convex part 11b protrudes from the middle part of the one end side 11a1 of the positive electrode body 11a in the x-axis direction, and the negative electrode convex part 12b extends from the middle part of the one end side 11a1 of the negative electrode body 11a in the x-axis direction. It may be protruding.
　また、正極が正極凸部を複数有していてもよい。負極が負極凸部を複数有していてもよい。 Further, the positive electrode may have a plurality of positive electrode protrusions. The negative electrode may have a plurality of negative electrode protrusions.
　次に、蓄電デバイス１の製造方法の一例について説明する。 Next, an example of a method for manufacturing the electricity storage device 1 will be described.
　まず、正極１１と、負極１２と、正極１１及び負極１２のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられており、かつ、正極１１及び負極１２の一の方向における両側を覆っているセパレータ１３を含む積層体を用意する。 First, provided between the positive electrode 11, the negative electrode 12, at least one of the positive electrode 11 and the negative electrode 12, and the electrodes located on both sides of the electrode, and one of the positive electrode 11 and the negative electrode 12. A laminate including separators 13 covering both sides in the direction of is prepared.
　次に、上記作製の積層体のセパレータ１３のみからなる一部分を切除することにより、第１及び第２の領域Ａ１，Ａ２を有する電極体３を作製する。 Next, the electrode body 3 having the first and second regions A1 and A2 is manufactured by cutting away a part of the laminated body made only from the separator 13.
　次に、電極体３をケース２内に収納し、正極１１と正極端子２ａを電気的に接続し、負極１２と負極端子２ｂを電気的に接続する。 Next, the electrode body 3 is accommodated in the case 2, the positive electrode 11 and the positive electrode terminal 2a are electrically connected, and the negative electrode 12 and the negative electrode terminal 2b are electrically connected.
　次に、ケース２内に電解質を充填することにより、セパレータ１３に電解質を含浸させる。 Next, the separator 13 is impregnated with the electrolyte by filling the case 2 with the electrolyte.
　以上の工程により、蓄電デバイス１を作製することができる。 The electricity storage device 1 can be manufactured through the above steps.
　以上説明したように、蓄電デバイス１では、セパレータ１３が、正極１１及び負極１２のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられている。このため、正極と負極との間のそれぞれに別個のセパレータを配する場合と比較して、セパレータ１３の枚数を減らすことができる。従って、蓄電デバイス１の低コスト化を図ることができる。本実施形態では、蓄電デバイス１は、１枚のセパレータ１３を有している。従って、蓄電デバイス１のさらなる低コスト化を図ることができる。 As described above, in the electricity storage device 1, the separator 13 is provided between at least one of the positive electrode 11 and the negative electrode 12 and the electrodes located on both sides of the electrode. For this reason, the number of separators 13 can be reduced as compared with the case where separate separators are provided between the positive electrode and the negative electrode. Therefore, cost reduction of the electrical storage device 1 can be achieved. In the present embodiment, the electricity storage device 1 has one separator 13. Therefore, further cost reduction of the electricity storage device 1 can be achieved.
　蓄電デバイスが有するセパレータの枚数を少なくするためには、蓄電デバイス１のように、セパレータ１３を渦巻き状（巻回状）に設けることが好ましい。 In order to reduce the number of separators included in the electricity storage device, it is preferable to provide the separator 13 in a spiral shape (winding shape) like the electricity storage device 1.
　なお、電極体が有するセパレータの枚数が１枚である必要は必ずしもない。例えば、図２に示す電極体３がｚ軸方向に複数積層されてケース内に収容されていてもよい。また、図２に示す電極体３の上に、さらに正極１１及び負極１２が積層されており、それら正極１１及び負極１２のそれぞれの間にシート状のセパレータが配されていてもよいし、九十九折状のセパレータが配されていてもよい。その九十九折状のセパレータは、図３に示すセパレータ１３と接続されていてもよい。 Note that the number of separators included in the electrode body is not necessarily one. For example, a plurality of electrode bodies 3 shown in FIG. 2 may be stacked in the z-axis direction and accommodated in the case. Further, a positive electrode 11 and a negative electrode 12 may be further laminated on the electrode body 3 shown in FIG. 2, and a sheet-like separator may be disposed between each of the positive electrode 11 and the negative electrode 12. A nineteen-fold separator may be provided. The 99-fold separator may be connected to the separator 13 shown in FIG.
　ところで、正極１１及び負極１２のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられているセパレータ１３は、当該電極の一方側に位置する部分と、当該電極の他方側に位置する部分とが接続されている。少ない枚数のセパレータで、より多くの正極１１と負極１２とを絶縁しようとすると、多くの電極の側面がセパレータで覆われることとなる。このため、蓄電デバイスの充放電時に、電解質の流動が阻害され、蓄電デバイスの充放電特性が低くなる傾向にある。 By the way, the separator 13 provided between at least one of the positive electrode 11 and the negative electrode 12 and the electrode located on both sides of the electrode includes a portion located on one side of the electrode, A portion located on the other side is connected. If an attempt is made to insulate a larger number of positive electrodes 11 and negative electrodes 12 with a small number of separators, the side surfaces of many electrodes will be covered with the separators. For this reason, at the time of charging / discharging of an electrical storage device, the flow of electrolyte is inhibited and the charge / discharge characteristics of the electrical storage device tend to be lowered.
　それに対して、蓄電デバイス１では、セパレータ１３が正極凸部１１ｂ及び負極凸部１２ｂのｘ軸方向（一の方向）の一方側を覆っていない第２の領域Ａ２が設けられている。このため、蓄電デバイス１では、充放電時における電解質の流動が阻害されにくい。従って、蓄電デバイス１は、優れた充放電特性を有する。 On the other hand, in the electricity storage device 1, the second region A2 is provided in which the separator 13 does not cover one side of the positive electrode convex portion 11b and the negative electrode convex portion 12b in the x-axis direction (one direction). For this reason, in the electrical storage device 1, the flow of the electrolyte during charging / discharging is hardly inhibited. Therefore, the electricity storage device 1 has excellent charge / discharge characteristics.
　以上のように、本実施形態に係る蓄電デバイス１は、安価でありつつ、優れた充放電特性を有している。 As described above, the electricity storage device 1 according to this embodiment has excellent charge / discharge characteristics while being inexpensive.
　以下、本発明の好ましい実施形態の他の例について説明する。以下の説明において、上記第１の実施形態と実質的に共通の機能を有する部材を共通の符号で参照し、説明を省略する。 Hereinafter, another example of the preferred embodiment of the present invention will be described. In the following description, members having substantially the same functions as those of the first embodiment are referred to by the same reference numerals, and description thereof is omitted.
　（第２の実施形態）
　図６は、第２の実施形態における電極体の模式的斜視図である。図７は、図６の線ＶＩＩ―ＶＩＩにおける模式的断面図である。また、図１を第１の実施形態と共通に参照する。 (Second Embodiment)
FIG. 6 is a schematic perspective view of an electrode body according to the second embodiment. FIG. 7 is a schematic cross-sectional view taken along line VII-VII in FIG. Also, FIG. 1 is referred to in common with the first embodiment.
　第２の実施形態に係る蓄電デバイスは、第１の実施形態に係る蓄電デバイス１と、セパレータ１３の形状において異なる。 The electricity storage device according to the second embodiment differs from the electricity storage device 1 according to the first embodiment in the shape of the separator 13.
　図６に示すように、本実施形態における電極体３ａでは、セパレータ１３は、第１の領域Ａ１において、第１及び第２の電極本体１１ａ、１２ａの少なくとも一方の一の方向（ｘ軸方向）における一方側を覆っている。具体的には、本実施形態においては、セパレータ１３は、第１の領域Ａ１において、九十九折状に設けられている。このため、セパレータ１３は、正極１１のｘ軸方向の一方側を覆う一方、他方側を覆っておらず、負極１２のｘ軸方向の一方側を覆っていない一方、他方側を覆っている。 As shown in FIG. 6, in the electrode body 3a in the present embodiment, the separator 13 has at least one direction (x-axis direction) of the first and second electrode bodies 11a and 12a in the first region A1. It covers one side. Specifically, in the present embodiment, the separator 13 is provided in a ninety-nine fold shape in the first region A1. For this reason, the separator 13 covers one side of the positive electrode 11 in the x-axis direction, does not cover the other side, does not cover the one side of the negative electrode 12 in the x-axis direction, and covers the other side.
　また、図７に示すように、セパレータ１３は、第２の領域Ａ２において、正極凸部１１ｂ及び負極凸部１２ｂの一の方向（ｘ軸方向）の少なくとも一方側を覆っていない。具体的には、本実施形態においては、セパレータ１３は、正極１１のｘ軸方向の一方側を覆っている一方、他方側を覆っていない。セパレータ１３は、負極１２のｘ軸方向の両側を覆っていない。 Further, as shown in FIG. 7, the separator 13 does not cover at least one side of one direction (x-axis direction) of the positive electrode convex portion 11b and the negative electrode convex portion 12b in the second region A2. Specifically, in the present embodiment, the separator 13 covers one side of the positive electrode 11 in the x-axis direction, but does not cover the other side. The separator 13 does not cover both sides of the negative electrode 12 in the x-axis direction.
　本実施形態においても、セパレータ１３が、正極１１及び負極１２のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられている。このため、正極と負極との間のそれぞれに別個のセパレータを配する場合と比較して、セパレータ１３の枚数を減らすことができる。従って、蓄電デバイスの低コスト化を図ることができる。 Also in this embodiment, the separator 13 is provided between at least one of the positive electrode 11 and the negative electrode 12 and the electrodes located on both sides of the electrode. For this reason, the number of separators 13 can be reduced as compared with the case where separate separators are provided between the positive electrode and the negative electrode. Therefore, cost reduction of the electricity storage device can be achieved.
　また、第２の領域Ａ２において、正極凸部１１ｂのｘ軸方向の一方側がセパレータ１３により覆われておらず、負極凸部１２ｂのｘ軸方向の両側がセパレータ１３により覆われていない。このため、本実施形態の蓄電デバイスでは、充放電時における電解質の流動が阻害されにくい。従って、本実施形態の蓄電デバイスは、優れた充放電特性を有する。 In the second region A2, one side of the positive electrode convex portion 11b in the x-axis direction is not covered with the separator 13, and both sides of the negative electrode convex portion 12b in the x-axis direction are not covered with the separator 13. For this reason, in the electrical storage device of this embodiment, the flow of the electrolyte during charging and discharging is not easily inhibited. Therefore, the electricity storage device of the present embodiment has excellent charge / discharge characteristics.
　以上のように、第２の実施形態に係る蓄電デバイスも、安価でありつつ、優れた充放電特性を有している。 As described above, the power storage device according to the second embodiment also has excellent charge / discharge characteristics while being inexpensive.
　なお、第２の実施形態に係る蓄電デバイスも、例えば、第１の実施形態において説明した製造方法の一例と実質的に同様の方法により製造することができる。従って、第２の実施形態において、第１の実施形態における蓄電デバイスの製造方法の記載を援用するものとする。 Note that the power storage device according to the second embodiment can also be manufactured by a method substantially similar to the example of the manufacturing method described in the first embodiment, for example. Therefore, in 2nd Embodiment, the description of the manufacturing method of the electrical storage device in 1st Embodiment shall be used.
　但し、第２の実施形態においては、正極１１と、負極１２と、正極１１及び負極１２のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられており、かつ、正極１１及び負極１２の少なくとも一方の一の方向における一方側を覆っているセパレータ１３を含む積層体を用意する。 However, in the second embodiment, provided between the positive electrode 11, the negative electrode 12, at least one of the positive electrode 11 and the negative electrode 12, and the electrodes located on both sides of the electrode, and A laminate including a separator 13 covering one side in one direction of at least one of the positive electrode 11 and the negative electrode 12 is prepared.
　（第３の実施形態）
　図８は、第３の実施形態における電極体の模式的斜視図である。図９は、図８の線ＩＸ―ＩＸにおける模式的断面図である。また、図１を第１の実施形態と共通に参照する。 (Third embodiment)
FIG. 8 is a schematic perspective view of an electrode body according to the third embodiment. FIG. 9 is a schematic cross-sectional view taken along line IX-IX in FIG. Also, FIG. 1 is referred to in common with the first embodiment.
　図８に示すように、本実施形態における電極体３ｂでは、セパレータ１３は、第１の領域Ａ１において、第１及び第２の電極本体１１ａ、１２ａの一方の一の方向（ｘ軸方向）における一方側を覆っている。具体的には、本実施形態においては、セパレータ１３は、ｙ軸方向から視た際に、略Ｕ字状に設けられている。そのセパレータ１３によって負極１２が挟持されている。このため、セパレータ１３は、正極１１のｘ軸方向の両側を覆っておらず、負極１２のｘ軸方向の一方側を覆っていない一方、他方側を覆っている。 As shown in FIG. 8, in the electrode body 3b in the present embodiment, the separator 13 is in one direction (x-axis direction) of one of the first and second electrode bodies 11a and 12a in the first region A1. Covers one side. Specifically, in the present embodiment, the separator 13 is provided in a substantially U shape when viewed from the y-axis direction. The negative electrode 12 is sandwiched between the separators 13. For this reason, the separator 13 does not cover both sides of the positive electrode 11 in the x-axis direction, and does not cover one side of the negative electrode 12 in the x-axis direction, but covers the other side.
　また、図９に示すように、セパレータ１３は、第２の領域Ａ２において、正極凸部１１ｂ及び負極凸部１２ｂのそれぞれのｘ軸方向の両側を覆っていない。 Further, as shown in FIG. 9, the separator 13 does not cover both sides of the positive electrode convex portion 11b and the negative electrode convex portion 12b in the x-axis direction in the second region A2.
　本実施形態においても、セパレータ１３が、正極１１及び負極１２のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられている。このため、正極と負極との間のそれぞれに別個のセパレータを配する場合と比較して、セパレータ１３の枚数を減らすことができる。従って、蓄電デバイスの低コスト化を図ることができる。 Also in this embodiment, the separator 13 is provided between at least one of the positive electrode 11 and the negative electrode 12 and the electrodes located on both sides of the electrode. For this reason, the number of separators 13 can be reduced as compared with the case where separate separators are provided between the positive electrode and the negative electrode. Therefore, cost reduction of the electricity storage device can be achieved.
　また、第２の領域Ａ２において、正極凸部１１ｂ及び負極凸部１２ｂのそれぞれのｘ軸方向の両側がセパレータ１３により覆われていない。このため、本実施形態の蓄電デバイスでは、充放電時における電解質の流動が阻害されにくい。従って、本実施形態の蓄電デバイスは、優れた充放電特性を有する。 Further, in the second region A2, both sides of the positive electrode convex portion 11b and the negative electrode convex portion 12b in the x-axis direction are not covered with the separator 13. For this reason, in the electrical storage device of this embodiment, the flow of the electrolyte during charging and discharging is not easily inhibited. Therefore, the electricity storage device of the present embodiment has excellent charge / discharge characteristics.
　以上のように、第３の実施形態に係る蓄電デバイスも、安価でありつつ、優れた充放電特性を有している。 As described above, the electricity storage device according to the third embodiment also has excellent charge / discharge characteristics while being inexpensive.
　（第４の実施形態）
　図１０は、第４の実施形態における電極体の模式的斜視図である。図１１は、図１０の線ＸＩ―ＸＩにおける模式的断面図である。 (Fourth embodiment)
FIG. 10 is a schematic perspective view of an electrode body according to the fourth embodiment. FIG. 11 is a schematic cross-sectional view taken along line XI-XI in FIG.
　図１０に示すように、本実施形態における電極体３ｃでは、第１の領域Ａ１において、セパレータ１３が、正極１１が収容された袋状である。このため、第１の領域Ａ１において、セパレータ１３は、正極１１の一の方向（ｘ軸方向）の両側を覆っている。第１の領域Ａ１において、セパレータ１３は、負極１２のｘ軸方向の両側を覆っていない。 As shown in FIG. 10, in the electrode body 3c in the present embodiment, the separator 13 has a bag shape in which the positive electrode 11 is accommodated in the first region A1. For this reason, in the first region A1, the separator 13 covers both sides of one direction (x-axis direction) of the positive electrode 11. In the first region A1, the separator 13 does not cover both sides of the negative electrode 12 in the x-axis direction.
　また、図１１に示すように、セパレータ１３は、第２の領域Ａ２において、正極凸部１１ｂのｘ軸方向の一方側を覆っている一方、他方側を覆っていない。 As shown in FIG. 11, the separator 13 covers one side in the x-axis direction of the positive electrode convex portion 11b in the second region A2, but does not cover the other side.
　本実施形態においても、セパレータ１３が、正極１１及び負極１２のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられている。このため、正極と負極との間のそれぞれに別個のセパレータを配する場合と比較して、セパレータ１３の枚数を減らすことができる。従って、蓄電デバイスの低コスト化を図ることができる。 Also in this embodiment, the separator 13 is provided between at least one of the positive electrode 11 and the negative electrode 12 and the electrodes located on both sides of the electrode. For this reason, the number of separators 13 can be reduced as compared with the case where separate separators are provided between the positive electrode and the negative electrode. Therefore, cost reduction of the electricity storage device can be achieved.
　また、第２の領域Ａ２において、第２の領域Ａ２において、正極凸部１１ｂのｘ軸方向の他方側がセパレータ１３によって覆われていない。このため、本実施形態の蓄電デバイスでは、充放電時における電解質の流動が阻害されにくい。従って、本実施形態の蓄電デバイスは、優れた充放電特性を有する。 In the second region A2, the other side of the positive electrode convex portion 11b in the x-axis direction is not covered with the separator 13 in the second region A2. For this reason, in the electrical storage device of this embodiment, the flow of the electrolyte during charging and discharging is not easily inhibited. Therefore, the electricity storage device of the present embodiment has excellent charge / discharge characteristics.
　以上のように、第４の実施形態に係る蓄電デバイスも、安価でありつつ、優れた充放電特性を有している。 As described above, the electricity storage device according to the fourth embodiment is also inexpensive and has excellent charge / discharge characteristics.
１　蓄電デバイス
２　ケース
２ａ　正極端子
２ｂ　負極端子
３，３ａ、３ｂ、３ｃ　電極体
１３　セパレータ
１１　正極
１１ａ　正極本体
１１ａ１　端辺
１１ｂ　正極凸部
１２　負極
１２ａ　負極本体
１２ａ１　端辺
１２ｂ　負極凸部
Ａ１　第１の領域
Ａ２　第２の領域 DESCRIPTION OF SYMBOLS 1 Power storage device 2 Case 2a Positive electrode terminal 2b Negative electrode terminal 3, 3a, 3b, 3c Electrode body 13 Separator 11 Positive electrode 11a Positive electrode main body 11a1 End side 11b Positive electrode convex part 12 Negative electrode 12a Negative electrode main body 12a1 End side 12b Negative electrode convex part A1 1st Area A2 Second area

Claims (7)

  1. 　矩形状の第１の電極本体と、前記第１の電極本体の一の方向に沿って延びる一の端辺から前記一の方向とは異なる方向に向かって突出する第１の電極凸部とを有する第１の電極と、
    　前記第１の電極本体に積層された矩形状の第２の電極本体と、前記第２の電極本体の前記一の方向に沿って延びる一の端辺から前記一の方向とは異なる方向に向かって突出する、前記第１の電極凸部に積層された第２の電極凸部とを有する第２の電極と、
    　第１及び第２の電極のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられたセパレータと、
    　前記セパレータに含浸した電解質と、
    　を備え、
    　前記セパレータは、前記第１の電極本体と前記第２の電極本体とが積層された第１の領域において前記第１及び第２の電極本体の前記一の方向における両側を覆っており、前記第１の電極凸部と前記第２の電極凸部とが積層された第２の領域において前記第１及び第２の電極凸部の前記一の方向の両側又は片側を覆っていない、蓄電デバイス。     A rectangular first electrode main body, and a first electrode convex portion protruding from one end extending along one direction of the first electrode main body in a direction different from the one direction. A first electrode comprising:
    A rectangular second electrode main body stacked on the first electrode main body and one end extending along the one direction of the second electrode main body in a direction different from the one direction. A second electrode having a second electrode protrusion stacked on the first electrode protrusion,
    A separator provided between at least one of the first and second electrodes and electrodes located on both sides of the electrode;
    An electrolyte impregnated in the separator;
    With
    The separator covers both sides in the one direction of the first and second electrode bodies in a first region where the first electrode body and the second electrode body are laminated, An electricity storage device that does not cover both sides or one side in the one direction of the first and second electrode protrusions in a second region where one electrode protrusion and the second electrode protrusion are stacked.
  2. 　前記セパレータは、前記第１の領域において前記第１及び第２の電極本体を周回するように巻回されている、請求項１に記載の蓄電デバイス。 2. The electricity storage device according to claim 1, wherein the separator is wound so as to go around the first and second electrode bodies in the first region.
  3. 　矩形状の第１の電極本体と、前記第１の電極本体の一の方向に沿って延びる一の端辺から前記一の方向とは異なる方向に向かって突出する第１の電極凸部とを有する第１の電極と、
    　前記第１の電極本体に積層された矩形状の第２の電極本体と、前記第２の電極本体の前記一の方向に沿って延びる一の端辺から前記一の方向とは異なる方向に向かって突出する、前記第１の電極凸部に積層された第２の電極凸部とを有する第２の電極と、
    　第１及び第２の電極のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられたセパレータと、
    　前記セパレータに含浸した電解質と、
    　を備え、
    　前記セパレータは、前記第１の電極本体と前記第２の電極本体とが積層された第１の領域において、前記第１及び第２の電極本体の少なくとも一方の前記一の方向における一方側を覆っており、前記第１の電極凸部と前記第２の電極凸部とが積層された第２の領域において前記第１及び第２の電極凸部の前記一の方向の両側を覆っていない、蓄電デバイス。     A rectangular first electrode main body, and a first electrode convex portion protruding from one end extending along one direction of the first electrode main body in a direction different from the one direction. A first electrode comprising:
    A rectangular second electrode main body stacked on the first electrode main body and one end extending along the one direction of the second electrode main body in a direction different from the one direction. A second electrode having a second electrode protrusion stacked on the first electrode protrusion,
    A separator provided between at least one of the first and second electrodes and electrodes located on both sides of the electrode;
    An electrolyte impregnated in the separator;
    With
    The separator covers one side in the one direction of at least one of the first and second electrode bodies in the first region where the first electrode body and the second electrode body are laminated. And in the second region where the first electrode protrusion and the second electrode protrusion are laminated, the first and second electrode protrusions do not cover both sides in the one direction. Power storage device.
  4. 　前記セパレータは、前記第１の領域において前記第１及び第２の電極本体を狭持する九十九折状である、請求項１～３のいずれか一項に記載の蓄電デバイス。 The electricity storage device according to any one of claims 1 to 3, wherein the separator has a 99-fold shape that sandwiches the first and second electrode bodies in the first region.
  5. 　前記セパレータは、前記第１の領域において前記第１又は第２の電極体を収容する袋状に設けられている、請求項１～３のいずれか一項に記載の蓄電デバイス。 The power storage device according to any one of claims 1 to 3, wherein the separator is provided in a bag shape that accommodates the first or second electrode body in the first region.
  6. 　請求項１又は２に記載の蓄電デバイスの製造方法であって、
    　前記第１の電極と、前記第２の電極と、前記第１及び第２の電極のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられており、かつ、前記第１及び第２の電極の一の方向における両側を覆っているセパレータを含む積層体を用意する工程と、
    　前記積層体の前記セパレータのみからなる一部分を切除することにより、前記第１及び第２の領域を有する前記電極体を形成する工程と、
    　を備える、蓄電デバイスの製造方法。     It is a manufacturing method of the electrical storage device according to claim 1 or 2,
    Provided between the first electrode, the second electrode, at least one of the first and second electrodes, and electrodes located on both sides of the electrode; and Preparing a laminate including a separator covering both sides in one direction of the first and second electrodes;
    Forming the electrode body having the first and second regions by cutting away a portion of the laminate that consists only of the separator;
    A method for manufacturing an electricity storage device.
  7. 　請求項３～５のいずれか一項に記載の蓄電デバイスの製造方法であって、
    　前記第１の電極と、前記第２の電極と、前記第１及び第２の電極のうちの少なくとも一方の電極と、当該電極の両側に位置する電極との間に設けられており、かつ、前記第１及び第２の電極の少なくとも一方の一の方向における一方側を覆っているセパレータを含む積層体を用意する工程と、
    　前記積層体の一の方向における一方側部分のセパレータの一部分を切除することにより、前記第１及び第２の領域を有する前記電極体を形成する工程と、
    　を備える、蓄電デバイスの製造方法。      A method for manufacturing an electricity storage device according to any one of claims 3 to 5,
    Provided between the first electrode, the second electrode, at least one of the first and second electrodes, and electrodes located on both sides of the electrode; and Preparing a laminate including a separator covering one side in one direction of at least one of the first and second electrodes;
    Forming the electrode body having the first and second regions by cutting a part of the separator on one side in one direction of the laminate;
    A method for manufacturing an electricity storage device.
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