Method for producing a collector with an electrode, method for producing a power storage device, and power storage device

Abstract

A method for manufacturing a collector with an electrode according to the present disclosure includes a step of manufacturing a collector with a coating and a step of manufacturing a collector with an electrode. In manufacturing the collector with a coating, a composite slurry is applied to a collector that is a sheet-shaped collector having a plurality of through-holes or a web-shaped collector having a plurality of through-holes, and a collector with a coating is manufactured that has at least one coating of the composite slurry.When manufacturing the collector with a coating, cooling air is blown onto the through holes at the same time as irradiating light to heat the coating of the collector with a coating, and the coating is dried to form a positive electrode layer or a negative electrode layer, and the collector with a coating is manufactured.

Description

BACKGROUNDTechnical FieldThe present disclosure relates to a method of manufacturing a collector having an electrode, a manufacturing method of a power storage device, and a power storage device.Related ArtJapanese Patent Application Laid-Open (JP-A) No. 2018-195587 discloses a specific method for manufacturing an electrode (hereinafter also referred to as "bipolar electrode") used in a nonaqueous electrolyte secondary bipolar battery (hereinafter also referred to as "power storage device"). This manufacturing method includes a step of coating a specific slurry (hereinafter also referred to as "composite slurry") on a collector to form a coated film, and drying the coated film.The drying step is performed in a drying furnace 900 illustrated in FIG. 8. In the drying oven 900, a plurality of hot air nozzles 901, a plurality of hot air nozzles 902, and a plurality of heaters 903 are provided. The hot air nozzles 901 supply high temperature hot air to the top of an electrode coating 910. The electrode coating film 910 includes a collector 912 on which a coating 911 is formed. The hot air nozzles 902 supply low temperature hot air to the bottom of the electrode coating 910. At the top of the collector 912, the emitters 903 can uniformly direct infrared rays J onto the surface of the coated film 911.As shown in FIG. 8, in the drying step at the time of drying, the infrared rays J are irradiated to the coated film 911 located on the collector 912, and furthermore, hot air drying is performed. In this hot air drying, the temperatures of the hot air from the hot air nozzles 902 and the hot air nozzles 901 are set to specific temperatures, and the temperature distribution in the thickness direction of the electrode coating 910 to be dried is varied. Thereby, the vicinity of the boundary between the collector 912 and the coated film 911 is maintained at a low temperature, and the vicinity of the surface of the coated film 911 is brought to a high temperature.In the manufacturing method disclosed in JP-A No. 2018-195587, the infrared rays J are irradiated on the surface of the coated film 911. Therefore, the coated film 911 can be dried in a short time (i.e., efficiently).On the other hand, the infrared rays J are radiated in a radial form from the radiators 903. Therefore, the infrared rays J supplied from the radiators 903 are irradiated not only on the coated film 911 but also on the regions of the collector 912 in which the coated film 911 is not formed (hereinafter, also referred to as "uncoated regions"). Therefore, there is a risk that the temperature in the uncoated regions of the collector 912 may excessively increase. An excessively increased temperature of the uncoated regions is, for example, a temperature of 200° C. or more.When the uncoated regions have a high temperature thermal history (e.g., temperatures of 200° C. or more), deterioration (e.g., surface oxidation) is liable to occur at the uncoated regions. When the surfaces of the uncoated regions oxidize, the adhesion of the uncoated regions and the seal portions (i.e., the resin) deteriorates, and there is a concern that the tightness of the power storage device deteriorates. When the surfaces of the uncoated regions oxidize, the conductivity of the uncoated regions becomes poor (i.e., the resistance of the uncoated regions increases), and there is a concern that the charge / discharge characteristics of the power storage device deteriorate. Therefore, there is a need for a method for manufacturing a collector having an electrode and a manufacturing method of a power storage device that can efficiently dry a coated layer of a composite material slurry while suppressing an excessive temperature rise of the uncoated regions of the collector. There is also a need for a power storage device having excellent sealability and charging / discharging property.The present disclosure has been made in view of the above-described circumstances. An embodiment of the present disclosure is directed to providing a method for manufacturing a collector having an electrode and a manufacturing method of a power storage device, with which a coated film of a composite material slurry can be efficiently dried while suppressing an excessive temperature rise in the uncoated regions of the collector. Another embodiment of the present disclosure is directed to providing a power storage device having excellent sealability and charging / discharging property.SUMMARYMeans for treating the above described issues include the following embodiments.<1> A method for manufacturing a collector having an electrode of a first aspect is a method for manufacturing a collector having an electrode, the method comprising:preparing a collector having a coating comprising at least one coating of a composite material slurry by applying the composite material slurry to a collector which is a sheet-shaped collector having a plurality of through holes or a sheet-shaped collector having a plurality of through holes; andfabricating a collector having an electrode by blowing cooling air onto the through holes while irradiating light for heating onto the coating of the collector with a coating and drying the coating to form a positive electrode layer or a negative electrode layer.In the present disclosure, "sheet-shaped collector" denotes the collector included in the power storage device. A sheet-shaped collector is used in the manufacture of a collector having an electrode in a batch process. A "sheet-shaped collector" is a tape-shaped collector used for continuously manufacturing collectors having one electrode. "Main surface" is the surface having the largest area among the numerous surfaces of the collector.The light for heating can be irradiated not only on the coating but also on the uncoated regions of the collector. When the light for heating is irradiated to the uncoated regions of the collector, there is a concern that the temperature of the uncoated regions of the collector excessively increases. The temperature of the uncoated regions that has excessively increased is, for example, greater than or equal to 200° C. In the first aspect, cooling air is blown onto the through holes simultaneously with irradiation of light for heating on the coating of the collector with a coating. Thereby, although the light for heating is irradiated to the uncoated regions of the collector, the uncoated regions of the collector can be efficiently cooled while circulating the cooling air in the through holes. An excessive temperature rise in the uncoated regions of the collector is therefore only possible with difficulty. As a result, the method for manufacturing a collector with an electrode according to the first aspect can efficiently dry the coating while suppressing an excessive temperature rise of the uncoated regions of the collector.<2> A method for manufacturing a collector having an electrode according to a second aspect is the method for manufacturing a collector having an electrode upward <1>, wherein the light for heating is laser light."Laser light" is light for heating emitted from a laser light source.The directivity of laser light is larger than the directivity of light for heating emitted from a lamp light source (hereinafter also referred to as "lamp light"). Therefore, it is more difficult for laser light to be irradiated to the uncoated regions of the collector than for lamp light. As a result, the method of manufacturing a collector with an electrode of the second aspect can more effectively suppress an excessive temperature rise in the uncoated regions of the collector.<3> A manufacturing method of a power storage device of a third aspect is a manufacturing method of a power storage device, comprising:fabricating a collector having an electrode, wherein the collector is the sheet-shaped collector manufactured by the method of manufacturing a collector having an electrode from above <1> or <2>;after performing the manufacturing of a collector with an electrode, cutting the sheet-shaped collector, and manufacturing a bipolar electrode, wherein the positive electrode layer is formed on a portion of a first main surface of a sheet-shaped collector and the negative electrode layer is formed on a portion of a second main surface located on an opposite side of the first main surface; andfabricating a bipolar electrode having a gasket member by welding at least a portion of a gasket member to uncoated regions where the positive electrode layer and the negative electrode layer are not formed, of the bipolar electrode, wherein:the plurality of through holes includes a first through hole, andthe seal frame member has a fitting portion that fits into the first through hole.In the third aspect, the seal frame member has the fitting portion that fits the first through hole. Thereby, the seal frame member can be disposed at a desired position of the sheet-shaped collector more than in a structure in which the seal frame member does not have a fitting portion. Therefore, the seal frame member can reliably close the plurality of through holes of the sheet-shaped collector. As a result, the manufacturing method of a power storage device of the third aspect can manufacture the power storage device in which occurrence of a short circuit due to nonaqueous electrolyte liquid between adjacent unit cells is suppressed. A "unit cell" includes a positive electrode layer, a negative electrode layer, a separator, and a nonaqueous electrolyte liquid.<4> A manufacturing method of a power storage device of a fourth aspect is the manufacturing method of a power storage device from above <3>, which further comprises:stacking said bipolar electrodes with a gasket member and fabricating a stack having injection ports communicating with regions between adjacent electrodes among said bipolar electrodes; andinjecting a nonaqueous electrolyte liquid into the injection ports, and injecting the nonaqueous electrolyte liquid into the regions via the through holes.In the fourth aspect, the nonaqueous electrolyte liquid is injected into the injection ports, and the nonaqueous electrolyte liquid is injected into the regions via the through holes. Thereby, the time in which the nonaqueous electrolyte liquid is filled in the regions between adjacent bipolar electrodes is shortened. As a result, the manufacturing method of a power storage device according to the fourth aspect can manufacture the power storage device efficiently.<5> A power storage device of a fifth aspect is a power storage device comprising:an electrode stack including a plurality of bipolar electrodes stacked over separators;a sealing frame forming regions between bipolar electrodes adjacent to each other among the plurality of bipolar electrodes; anda non-aqueous electrolyte liquid housed in the regions, wherein:the bipolar electrode includes a sheet-shaped collector, a positive electrode layer formed on a portion of a first main surface of the sheet-shaped collector, and a negative electrode layer formed on a portion of a second main surface of the sheet-shaped collector that is on a side opposite to the first main surface,the sheet-shaped collector has uncoated regions at peripheral edges of the first main surface and the second main surface, to which the positive electrode layer and the negative electrode layer are not formed and to which the seal frame is welded,the seal frame has injection ports communicating with the regions, andthe sheet-shaped collector has a plurality of through holes in the uncoated regions.The power storage device of the fifth aspect may be manufactured according to the manufacturing method of a power storage device of the third aspect or the fourth aspect. Therefore, the uncoated regions of the leaf-shaped collector do not have a high temperature thermal history (e.g., greater than or equal to 200° C.). Namely, the surfaces of the uncoated regions of the leaf-shaped collector are not oxidized. As a result, the adhesion between the uncoated regions of the sheet-shaped collector and the gasket frame is excellent. In addition, the conductivity of the uncoated regions of the leaf-shaped collector is better than a structure in which the surfaces of the uncoated regions are oxidized. As a result, the power storage device of the fifth aspect has excellent sealability and charging / discharging characteristic. Moreover, the sheet-shaped collector includes a plurality of through holes in the uncoated regions. Thereby, at the time of injection of the nonaqueous electrolyte liquid, injection via the through holes can be performed. As a result, in the method for manufacturing the power storage device of the fifth aspect, the injection of the nonaqueous electrolyte liquid is quickly completed.<6> A power storage device of a sixth aspect is the power storage device from above <5>, wherein:the plurality of through holes comprises at least one first through hole,said gasket frame has gasket frame members welded to said uncoated region of at least one of said first main surface or said second main surface of said leaf-shaped collector of each of said plurality of bipolar electrodes, andthe seal frame member has a fitting portion that fits into the first through hole.In the sixth aspect, the seal frame member includes the fitting portion that fits into the first through hole. Therefore, the seal frame member can be disposed at a desired position of the sheet-shaped collector more than in a structure in which the seal frame member does not have the fitting portion that fits to the first through hole. Therefore, the seal frame member can reliably close the plurality of through holes of the sheet-shaped collector. As a result, in the power storage device of the sixth aspect, occurrence of a short circuit due to nonaqueous electrolyte liquid between adjacent unit cells is suppressed.<7> A power storage device of a seventh aspect is the power storage device from above<6>, wherein the plurality of through holes include:at least two of the first through holes, andat least one second through hole whose diameter is smaller than the diameter of the first through holes and into which the fitting portion is not inserted.In the seventh aspect, the plurality of through holes includes at least two first through holes. Therefore, the seal frame member can be disposed at a desired position of the sheet-shaped collector more than a structure in which the seal frame member has a through hole. Therefore, the seal frame member can more reliably close the plurality of through holes of the sheet-shaped collector. As a result, in the power storage device of the seventh aspect, occurrence of a short circuit due to nonaqueous electrolyte liquid between adjacent unit cells is suppressed.According to an embodiment of the present disclosure, there is provided a method for manufacturing a collector having an electrode and a manufacturing method of a power storage device that can efficiently dry a coated film of a composite material slurry while suppressing an excessive temperature rise in the uncoated regions of the collector. According to another embodiment of the present disclosure, a power storage device having excellent sealability and charging / discharging property is provided.BRIEF DESCRIPTION OF THE DRAWINGSExemplary embodiments of the present invention are described in more detail with reference to the following figures, in which: FIG. 1 is an external perspective view of a power storage device related to an embodiment of the present disclosure; FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1 ; FIG. 3 is a front view of a sheet-shaped collector according to the embodiment of the present disclosure; FIG. 4 is a front view of a bipolar electrode having a seal frame member according to the embodiment of the present disclosure; FIG. 5 is a cross-sectional view taken along line V-V of FIG. 4 ; FIG. 6 is a drawing for explaining a first drying step related to the embodiment of the present disclosure; FIG. 7 is a drawing for explaining a second drying step related to the embodiment of the present disclosure; and Fig. 8 is a schematic drawing of a conventional drying apparatus.DETAILED DESCRIPTIONIn the present disclosure, numerical ranges expressed by using "-" mean ranges in which the numerical values listed before and after the "-" are included as the minimum value and the maximum value, respectively. In numerical value ranges that are stepwise expressed in the present disclosure, the maximum value or the minimum value listed in a certain numerical value range may be replaced with the maximum value or the minimum value of another numerical value range that is stepwise expressed. In the context of the present disclosure, combinations of two or more advantageous aspects are more advantageous aspects. In the present disclosure, "step" is not only an independent step, but also includes steps that achieve the intended purpose of this step even in a case where this step cannot be clearly distinguished from another step.A manufacturing method of a power storage device and a power storage device relating to embodiments of the present disclosure will be described below with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and the description will not be repeated.(1) The manufacturing method of a power storage device of the present disclosure is a method that manufactures a power storage device 1. The method for manufacturing a power storage device of the present disclosure includes a step of manufacturing a collector having an electrode, a cutting step, a step of manufacturing a first electrode, a step of manufacturing a second electrode, a step of manufacturing a first end electrode, a step of manufacturing a stack, a step of manufacturing a temporarily fixed body, a step of reducing the pressure, a step of injecting, and a step of welding.The step of manufacturing a collector with an electrode, the step of cutting, the step of manufacturing the first electrode, the step of manufacturing the second electrode, the step of manufacturing the stack, the step of manufacturing the temporarily fixed body, the step of depressurizing, the step of injecting, and the step of welding are performed in this order. The first step of final electrode fabrication and the second step of final electrode fabrication are performed before the step of stack fabrication.In the present embodiment, a reel-to-reel device is used in fabricating a collector with an electrode.(1.1) As illustrated in FIG. 1, the power storage device 1 is a rectangular parallelepiped-shaped object. The power storage device 1 includes an electrode stack 10, a seal frame 20, and a nonaqueous electrolyte liquid (not illustrated). The seal frame 20 seals the peripheral side surfaces of the electrode stack 10. The power storage device 1 is sealed by an outer body (not illustrated), which is a known moisture-proof laminate film.In the present embodiment, the longitudinal direction of the main surface of the power storage device 1 is defined as the X-axis direction. The short-side direction of the main surface of the power storage device 1 is defined as a Y-axis direction. The thickness direction of the power storage device 1 is defined as a Z-axis direction. The X-axis, the Y-axis and the Z-axis are perpendicular to each other. The direction of the Z axis and the direction of gravity are parallel. These directions do not limit the orientation of the power storage device of the present disclosure at the time of its use.The length L 1 (see FIG. 1 ) of the power storage device 1 in the X-axis direction and the length L 2 (see FIG. 1 ) in the Y-axis direction may each exceed 1 m.(1.1.1) Electrode StackThe electrode stack 10 is a rectangular, parallel-flat object. The electrode stack 10 includes a plurality of bipolar electrodes 11 stacked via separators 12 in the Z-axis direction. Specifically, as illustrated in FIG. 2, the electrode stack 10 includes the plurality of bipolar electrodes 11, the plurality of separators 12, a positive electrode layer-side final end electrode 13, and a negative electrode layer-side final end electrode 14. The plurality of bipolar electrodes 11 and the plurality of separators 12 are laminated alternately in the Z-axis direction. The electrode layer positive side end electrode 13 is laminated via the separator 12 on the bipolar electrode 11 positioned farthest to one side in the lamination direction (the positive direction side in the Z-axis direction) of the plurality of bipolar electrodes 11.(1.1.1.1) Bipolar ElectrodesThe bipolar electrode 11 has a sheet-shaped collector 110A (hereinafter also referred to as "collector 110A"), a positive electrode layer 111A, and a negative electrode layer 112A. The positive electrode layer 111A constitutes a portion of a second main surface S 110B of the collector 110A. The negative electrode layer 112A constitutes a portion of a first main surface S 110A of the collector 110A. The bipolar electrode 11 may have a known structure.The collector 110A supplies current to the positive electrode layer 111A and the negative electrode layer 112A during charging or discharging of the power storage device 1. Metal foils, conductive resin materials, and conductive inorganic materials are examples of the material of the collector 110A. Examples of metal foils are aluminum foil, copper foil, nickel foil, titanium foil and stainless steel foil. Examples of conductive resin materials are resins in which a conductive filler is added to a conductive polymer material or a non-conductive polymer material as needed. Layers may be formed on the surfaces of the collector 110A. The films may be formed by a known method (e.g., plating or spray coating). The thickness of the collector 110A may be 1 μm - 100 μm.As illustrated in FIG. 3, the collector 110A has a pair of first sides X 110 extending in the X-axis direction and a pair of second sides Y 110 extending in the Y-axis direction in plan view. Thus, in plan view, the collector 110A is rectangular. As illustrated in FIG. 3, the collector 110A has uncoated regions R 110 at the peripheral edges of the first main surface S 110A and the second main surface S 110B. The positive electrode layer 111A and the negative electrode layer 112A are not formed at the uncoated regions R 110. In the power storage device 1, the seal frame 20 is welded to the uncoated regions R 110.The collector 110A includes a plurality of through holes H in the uncoated regions R 110. In the present embodiment, the shape of the through holes H is circular. In the present embodiment, the plurality of through holes H along the X axis are formed in the portions of the uncoated regions R 110 located on the both sides of the collector 110A in the Y axis. In the present embodiment, the plurality of through holes H are six first through holes HA and 40 second through holes HB. The second through holes HB have a smaller diameter L 4 (see FIG. 5 ) than a diameter L 3 (see FIG. 5 ) of the first through holes HA. The diameter L 3 of the first through holes HA is 2 mm, for example. The diameter L 4 of the second through holes HB is, for example, less than 55 μm. The plurality of second through holes HB are arranged at a uniform pitch L 5 (see FIG. 3 ) along the X axis. The distance L 5 of the second through holes HB is, for example, greater than or equal to 5.7 mm.The positive electrode layer 111A contains an active material for the positive electrode layer (e.g., a lithium composite metal oxide having a laminar rock salt structure, a metal oxide having a spinel structure, and a polyanion compound) that can store and release the charge carriers. The thickness (the length in the Z-axis direction) of the positive electrode layer 111A may be 2 μm - 500 μm.The negative electrode layer 112A contains a negative electrode layer active material (e.g., carbon and compounds that can be alloyed with lithium) that can receive and release the charge carriers. Examples of carbon are natural graphite, artificial graphite, hard carbon (carbon difficult to graphitized), and soft carbon (carbon easy to graphitized). Examples of artificial graphite are highly oriented graphite and mesocarbon microspheres. Examples of elements that can be alloyed with lithium are silicon and tin. The thickness (length in the Z-axis direction) of the negative electrode layer 112A may be 2 μm - 500 μm. The thickness of the negative electrode layer 112A may be the same as or different from the thickness of the positive electrode layer 111A.The positive electrode layer and the negative electrode layer may contain, as needed, a conductivity assistant for improving electron conductivity, a binder, an electrolyte supporting salt (lithium salt) for improving ion conductivity, a polymer electrolyte, and additives (e.g., trifluoropropylene carbonate and a filler serving as a reinforcing agent). Examples of the conductivity assistant include carbon nanofibers, acetylene black, carbon black, and graphite. Examples of the binder include fluorine-containing resins (polyvinylidene fluoride, polytetrafluoroethylene, fluororubber), thermoplastic resins (e.g., polypropylene, polyethylene), imide resins (e.g., polyimide, polyamide-imide), alkoxysilyl group-containing resins, acrylic resins (e.g., acrylic acid, methacrylic acid), styrene-butadiene rubber (SBR), carboxymethylcellulose, alginates (e.g., sodium alginate, ammonium alginate), water-soluble cellulose ester crosslinked bodies, and starch-acrylic acid graft polymers. A single or a plurality of these binders may be used.(1.1.1.2) SeparatorThe separator 12 maintains the distance between the positive electrode layer 111A and the negative electrode layer 112A to prevent the occurrence of contact shorts, and allows the passage of the carriers (e.g., lithium ions). The peripheral edge of the separator 12 is welded to the gasket 20, and the separator 12 is held by the gasket 20. Examples of the separator 12 are a porous sheet and a non-woven fabric. Examples of the material of the porous film are polyolefin (polypropylene, polyethylene) and polyester. Examples of the material of the nonwoven fabric are polypropylene, polyethylene terephthalate and methyl cellulose. The separator 12 may be a known structure.(1.1.1.3) The positive electrode layer-side end electrode 13 has the collector 110A and the positive electrode layer 111A. The positive electrode layer 111A is formed on the second main surface S 110B of the collector 110A. The positive electrode layer at the end of the electrode 13 may be a known structure.(1.1.1.4) The negative electrode layer on the end electrode 14 side is composed of the collector 110A and the negative electrode layer 112A. The negative electrode layer 112A is formed on the first main surface S 110A of the collector 110A. The negative electrode layer on the end electrode 14 side may be a known structure.(1.1.2) Seal FrameThe gasket frame 20 forms regions T between the adjacent bipolar electrodes 11 of the plurality of bipolar electrodes 11. the positive electrode layer 111A, the negative electrode layer 112A, and the separator 12 are accommodated in the region T in a nonaqueous electrolyte liquid. The gasket 20 prevents the nonaqueous electrolyte liquid accommodated in the regions T from leaking to the outside. The seal frame 20 can prevent the intrusion of moisture into the regions T from the outside of the power storage device 1. The seal frame 20 has injection ports (not shown), and the injection ports communicate with the regions T.The seal frame 20 is an angular tubular object having a rectangular cross section. The seal frame 20 includes a plurality of seal frame members 21. Of the plurality of seal frame members 21, the seal frame members 21 adjacent to each other directly abut each other. At least a portion of the interface between the adjacent seal frame members 21 is welded.(1.1.2.1) Seal Frame MemberThe seal frame member 21 is an angular object rectangular in cross section. In the present embodiment, the gasket members 21 are welded to the uncoated regions R 110 of the first main surfaces S 110A and the second main surfaces S 110B of the respective collectors 110A of the plurality of bipolar electrodes 11. The seal frame members 21 are welded to the plurality of through holes H. Namely, the plurality of through holes H are closed by the seal frame members 21 so that the nonaqueous electrolyte liquid does not flow into the plurality of through holes H.FIG. 4 is a front view of a bipolar electrode 33 having a seal frame member. As described later, the bipolar electrode 33 with the lead frame member is a part of the power storage device 1. the bipolar electrode 33 with the lead frame member has the bipolar electrode 11 and the lead frame member 21. the lead frame member 21 is welded to the uncoated regions R 110 of the first main surface S 110A and the second main surface S 110B of the collector 110A of the bipolar electrode 11. FIG. 5 is a cross-sectional view taken along line V-V of FIG. 4.As illustrated in FIG. 5, the seal frame member 21 includes a first seal frame member part 211 and a second seal frame member part 212. The first seal frame part 211 and the second seal frame part 212 are welded together. The first seal frame member 211 includes a flat plate-shaped main body 2111 and a peripheral wall portion 2112. The portion of the peripheral wall 2112 is located at the peripheral edge of the flat plate-shaped main body 2111 and protrudes from the flat plate-shaped main body 2111 in the negative direction of the Z axis.The second seal frame member 212 has a flat plate-shaped main body 2121 and six second fitting portions 2122. The six second fitting portions 2122 are respectively positioned at positions corresponding to the six first through holes HA. The second fitting portions 2122 protrude from the flat plate-shaped main body 2121 in the positive direction of the Z axis. The six second fitting portions 2122 fit into the corresponding first through holes HA, respectively. The second seal frame member 212 does not fit into one of the plurality of second through holes HB. The shape of the second fitting portion 2122 is, for example, solid cylindrical, and the diameter L 6 (see FIG. 5 ) of the second fitting portion 2122 is, for example, 1 mm.Examples of the material of the gasket member 21 are polyethylene, polystyrene, acrylonitrile-butadiene-styrene copolymer (ABS) resin, modified polypropylene, and acrylonitrile-styrene resin.(1.1.3) Nonaqueous Electrolyte LiquidThe nonaqueous electrolyte liquid is accommodated in the regions T. The nonaqueous electrolyte liquid may include a nonaqueous solvent and a lithium salt. Examples of the lithium salt include LiClO 4, LiAsF 6, LiPF 6, LiB 4, LiCF 3 SO 3, LiN(FSO 2)2 and LiN(CF 3 SO 2)2. Examples of non-aqueous solvents are cyclic carbonates, cyclic esters, chain carbonates, chain esters and ethers. The nonaqueous electrolyte liquid may contain additives (e.g., lithium bis(oxalato)borate).(1.1.4) Applications Using ApplicationsThe power storage device 1 can be used as a power source for a four-wheel electric vehicle, a two-wheel electric vehicle, a portable device, or a power storage system. Examples of four-wheeled electric vehicles include BEVs (Battery Electric Vehicles), PHEVs (Plug-in Hybrid Electric Vehicles) and HEVs (Hybrid Electric Vehicles). Examples of two-wheeled electric vehicles are electric motor bicycles and bicycles with electric assistance. Examples of wearable devices include smart phones, tablet computers, notebook computers, power tools, and video cameras. Examples of power storage systems include household power storage systems, industrial power storage systems, and energy storage systems (ESS).(1.2) In manufacturing a collector having an electrode, a collector having an electrode is manufactured. In the collector having an electrode, the positive electrode layer 111A is formed on a portion of a first main surface S 100A of a sheet-shaped collector 110B (hereinafter also referred to as "collector 110B") having the plurality of through holes H, and the negative electrode layer 112A is formed on a portion of the second main surface S 110B.Specifically, the step of manufacturing a collector with an electrode includes a first coating step, a first drying step, a second coating step, and a second drying step. The first coating step, the first drying step, the second coating step, and the second drying step are performed in this order.(1.2.1) First Step of CoatingIn the first coating step, a positive electrode composite slurry is intermittently applied to the collector 110B, and a collector 31 having a first coating is manufactured. The collector 31 having a first coating includes the collector 110B and a plurality of coatings 111B of the positive electrode composite material slurry. The plurality of coatings 111B of the positive electrode composite material slurry are intermittently disposed along the longitudinal direction of the collector 110B on the second main surface S 110B of the collector 110B. The composite material slurry for the positive electrode is an example of a composite material slurry.The sheet-shaped collector 110B has a similar structure to the sheet-shaped collector 110A, except that the sheet-shaped collector 110B is not cut in a sheet shape.The positive electrode composite material slurry contains the positive electrode layer structural materials 111A and a solvent. The solvent may be a known aqueous solvent or a known organic solvent. Examples of the aqueous solvent are water and liquid mixtures of water and an alcohol (e.g., ethyl alcohol, methyl alcohol, isopropyl alcohol). Examples of the organic solvent are N-methyl-2-pyrrolidone, dimethylformamide, dimethylacetamide, methylformamide, cyclohexane and hexane. It is sufficient if the solvent is a known solvent.The method of coating is not particularly limited, and a known method is sufficient therefor. Examples of the coating method are screen printing, electrostatic spray coating, ink jet method, blade coating, spray coating and flow coating. The positive electrode composite material slurry may be applied to the collector 110B being conveyed, and the plurality of positive electrode composite material slurry coatings 111B may be continuously formed on the second main surface S 110B of the collector 110B.The method of forming the plurality of through holes H of the collector 110B is not particularly limited, and a known method is sufficient therefor. Examples of the method for forming the plurality of through holes H are laser processing, end milling, punching, and etching.(1.2.2) First drying stepIn the first drying step, simultaneously with the irradiation of the coatings 111B of the collector 31 with a first coating by laser light G, cooling air F is blown onto the plurality of through holes H, and the coating 111B is dried to form the positive electrode layers 111A, and the collector with a positive electrode is manufactured. The positive electrode collector includes the collector 110B and the plurality of positive electrode layers 111A. The plurality of positive electrode layers 111A are intermittently arranged along the longitudinal direction of the collector 110B on the second main surface S 110B of the collector 110B. The collector having a positive electrode is an example of a collector having an electrode.In the present embodiment, the first drying step is performed inside the drying furnace 80 illustrated in FIG. 6. The drying furnace 80 has a laser light source 81, a plurality of air supply portions 82, a plurality of exhaust air portions 83, a plurality of air flow control plates 84, and a conveyor (not shown). The laser light source 81, the plurality of air supply portions 82, and the plurality of air flow control plates 84 are disposed on the second main surface S 110B side (coatings 111B side) of the collector 110B. The plurality of exhaust gas portions 83 are disposed on the first main surface S 110A of the collector 110B.The laser light source 81 irradiates the laser light G onto the first coating coatings 111B of the collector 31. From the viewpoint of efficiently drying the coatings 111B, it is preferable that the irradiation amount of the laser light G is adjusted so that the temperature of the regions of the collector 110B in which the coatings 111B are formed (hereinafter also referred to as "coated regions") becomes greater than or equal to 180° C. In order to avoid an excessive temperature rise in the uncoated regions, it is preferable that the temperature of the coated regions at the time of irradiation of the laser light G is less than or equal to 220° C. The wavelength of the laser light G is not particularly limited and is selected according to the materials of the positive electrode composite slurry. It is sufficient if the laser light source 81 is a known laser light source. Examples of the laser light source 81 include gas lasers (e.g., excimer laser and CO 2- laser), solid state lasers (e.g., Nd:YAG laser), and semiconductor lasers.The air guiding portions 82 blow the cooling air F to the plurality of through holes H of the collector 110B. The temperature and the wind speed of the cooling air F are selected according to the irradiated amount of the laser light G, and preferably set so that the temperature of the uncoated regions of the collector 110B at the time of irradiation with the laser light G is less than or equal to 160° C. In order to prevent deterioration (e.g., surface oxidation) of the uncoated regions from occurring, it is preferable that the temperature of the uncoated regions of the collector 110B at the time of irradiation with the laser light G be less than or equal to 120° C. The temperature of the uncoated regions of the collector 110B at the time of irradiation of the laser light G may be greater than or equal to 80° C. The temperature of the cooling air F may be a normal temperature (23° C.). It is sufficient if the air-conducting sections 82 have known structures.The exhaust gas portions 83 discharge the cooling air F having passed through the through holes H to the outside of the drying furnace 80. Thereby, the steam (e.g., the solvent of the positive electrode composite material slurry) inside the drying furnace 80 can be discharged to the outside. Therefore, the temperature of the uncoated regions of the collector 110B at the time of irradiation of the laser light G by the cooling air F can be efficiently cooled. It is sufficient if the sections 83 have known structures.The plurality of air flow control plates 84 guide the cooling air F supplied from the air supply portions 82 to the numerous through holes H of the collector 110B. Thereby, the temperature of the uncoated regions of the collector 110B at the time of irradiation with the laser light G by the cooling air F can be efficiently cooled.The device conveys the collector 31 with a first coating. The speed of conveyance of the first-coat collector 31 is appropriately adjusted according to the size of the first-coat collector 31 and the type of the laser light source 81. The conveying speed is, for example, 34 m / min. It is sufficient if the device is of known construction.(1.2.3) Second Step of CoatingIn the second coating step, a negative electrode composite slurry is intermittently applied to the positive electrode collector, and a collector 32 having a second coating is manufactured. The collector 32 having a second coating includes the collector 110B, the plurality of positive electrode layers 111A, and a plurality of negative electrode composite slurry coatings 112B. The plurality of positive electrode layers 111A are formed on the second main surface S 110B of the collector 110B. The plurality of coatings 112B of the negative electrode composite slurry are formed on the first main surface S 110A of the collector 110B. The plurality of coatings 112B of the negative electrode composite slurry are arranged to face the plurality of positive electrode layers 111A via the collector 110B. The composite material slurry for the negative electrode is an example of a composite material slurry.The negative electrode composite material slurry contains the negative electrode layer structural materials 112A and a solvent. Examples of the solvent are similar to those described for the solvent of the first coating step. It is sufficient if the solvent is a known solvent.The coating method is not particularly limited, and examples thereof are similar to the coating methods of the first coating step. The negative electrode composite slurry may be coated on the collector with a positive electrode being conveyed, and the plurality of coatings 112B of the negative electrode composite slurry may be continuously formed on the first main surface S 110A of the collector 110B.(1.2.4) Second drying stepIn the second drying step, the cooling air F is blown out through the plurality of through holes H simultaneously with the irradiation of the coatings 112B of the second-coating collector 32, and the coating 112B is dried to form the negative electrode layers 112A, and a bipolar-electrode collector is manufactured. The bipolar electrode collector includes the collector 110B, the plurality of positive electrode layers 111A, and the plurality of negative electrode layers 112A. The plurality of positive electrode layers 111A are formed on the second main surface S 110B of the collector 110B. The plurality of negative electrode layers 112A are formed on the first main surface S 110A of the collector 110B. The plurality of negative electrode layers 112A are arranged to be opposed to the plurality of positive electrode layers 111A via the collector 110B.In the present embodiment, the second drying step is performed inside the drying furnace 80 illustrated in FIG. 7. The drying oven 80 of the second drying step is constructed similarly to the drying oven 80 of the first drying step.(1.3) Cutting step: Cutting stepIn the cutting step, the sheet-shaped collector 110B of the collector is cut with a bipolar electrode, and the bipolar electrodes 11 are manufactured. On the bipolar electrode 11, the positive electrode layer 111A is formed in a portion of the first main surface S 100A of the collector 110A, and the negative electrode layer 112A is formed in a portion of the second main surface S 110B of the collector 110A. The method of cutting the sheet-shaped collector 110B is not particularly limited, and a known method is sufficient therefor.(1.4) In the first electrode manufacturing step, a portion of the lead frame member 21 is welded to the collector 110A of the bipolar electrode 11, and the lead frame member bipolar electrode 33 (see FIG. 2 ) is manufactured. The seal frame member 21 of the bipolar electrode 33 having a seal frame member is not welded to the plurality of through holes H of the collector 110A. Namely, the plurality of through holes H of the collector 110A are not completely closed by the seal frame member 21. The method of welding is not particularly limited, and a known method is sufficient.(1.5) In the second electrode manufacturing step, the separator 12 having a gasket member is welded to the gasket member 21 of the bipolar electrode 33, and a bipolar electrode 34 having a separator (see FIG. 2 ) is manufactured. The method of welding is not particularly limited, and a known method is sufficient.(1.6) First step of manufacturing the final electrode In first manufacturing the final electrode, a final electrode 35 is manufactured with a gasket member (see FIG. 2 ). The final end electrode 35 having a lead frame member has the positive electrode layer side of the final end electrode 13 and the lead frame member 21. A portion of the seal frame member 21 is welded to the positive electrode layer side collector 110A of the end electrode 13. The seal frame member 21 is not welded to the plurality of through holes H of the collector 110A. Namely, the plurality of through holes H of the collector 110A are not completely closed by the seal frame member 21. The method of manufacturing the final electrode 35 having a gasket member is not particularly limited, and an example thereof is a method consistent with the method of manufacturing the bipolar electrode 33 having a gasket member (see FIG. 2 ).(1.7) Second Final Electrode Manufacturing Step In the second Final Electrode Manufacturing Step, a final electrode 36 is manufactured with a separator (see FIG. 2 ). The final end electrode 36 with separator is composed of the negative electrode layer of the final end electrode 14, the gasket member 21, and the separator 12. The seal frame member 21 is not welded to the plurality of through holes H of the collector 110A. Namely, the plurality of through holes H of the collector 110A are not completely closed by the seal frame member 21. The method of manufacturing the final electrode 36 with a separator is not particularly limited, and an example thereof is a method consistent with the method of manufacturing the bipolar electrode 34 with a separator (see FIG. 2 ).(1.8) Step of Stack ManufacturingIn manufacturing the stack, the plurality of bipolar electrodes 34 are stacked with a separator, and a stack having injection ports (not shown) communicating with the regions T is manufactured. Specifically, the plurality of bipolar electrodes 34 with a separator are laminated on the terminal electrode 36 with a separator, and finally the terminal electrode 35 with a gasket member is laminated thereon, and the stack is manufactured. The stack has a similar structure to the power storage device 1, except that a nonaqueous electrolyte liquid is not provided to the stack, and the plurality of seal frame members 21 are not integrally formed, and the seal frame members 21 are not welded to the plurality of through holes H of the collectors 110A.(1.9) Temporary Solid Body Manufacturing Step In manufacturing the temporary body, the plurality of seal frame members 21 of the stack are heated. Hereinafter, the heated stack is referred to as a "temporarily fixed body". On the provisionally fixed body, the adjacent seal frame members 21 of the plurality of seal frame members 21 are welded together. The plurality of seal frame members 21 are thus integral. The temporarily fixed body has a similar structure to the power storage device 1, except that a nonaqueous electrolyte liquid is not provided to the temporarily fixed body and the seal frame members 21 are not welded to the numerous through holes H of the collectors 110A. The method of heating the seal frame members 21 is not particularly limited, and a known method is sufficient therefor. Examples are laser heating, infrared (IR) heating, microwave heating, induction heating, hot air heating, hot plate heating, and heat rolling.(1.10) Pressure Reducing StepIn the pressure reduction step, the pressure is reduced within the plurality of regions T of the temporarily attached body. Thereby, the air in the regions T is discharged to the outside of the temporarily attached body. As a result, the nonaqueous electrolyte liquid can be easily injected into the regions T. It is sufficient that the method for pressure reduction in the regions T is a known method.(1.11) Injection stepIn the injection step, a nonaqueous electrolyte liquid is injected into the regions T of the temporarily fixed body, and the nonaqueous electrolyte liquid is injected into the regions T via the through holes H. Thereby, a temporarily fixed body containing a nonaqueous electrolyte liquid is obtained. In the temporarily fixed body containing a nonaqueous electrolyte liquid, the gasket members 21 are not welded to the numerous through holes H of the collectors 110A. Therefore, when the nonaqueous electrolyte liquid is injected into the injection ports of the temporarily fixed body, the nonaqueous electrolyte liquid passes through the through holes H and can enter the regions T. The temporary fixed body containing a nonaqueous electrolytic liquid is similar in structure to the power storage device 1 except that in the temporary fixed body containing a nonaqueous electrolytic liquid, the seal frame members 21 are not welded to the multiple through holes H of the collectors 110A.(1.12) Welding StepIn welding, the plurality of seal frame members 21 of the temporarily fixed body containing a nonaqueous electrolyte liquid are heated, and the seal frame 20 is formed to which the seal frame members 21 are welded to the plurality of through holes H. Thereby, the power storage device 1 is manufactured. The method of heating the seal frame members 21 is not particularly limited, and a known method is sufficient therefor. Examples are laser heating, infrared ray (IR) heating, microwave heating, induction heating, hot air heating, hot plate heating, and heat rolling.(1.3) Operation / EffectAs described with reference to FIGS. 1 to 7, the method for manufacturing a collector with an electrode of the present embodiment includes the first coating step, the first drying step, the second coating step, and the second drying step.The laser light G may be irradiated not only on the coatings 111B, 112B but also on the uncoated regions R 110 of the collector 110B. When the laser light G is irradiated to the uncoated regions R 110 of the collector 110B, there is a risk that the temperature of the uncoated regions R 110 of the collector 110B may increase too much. An excessively increased temperature of the uncoated regions R 110 is, for example, greater than or equal to 200° C.In the present embodiment, the cooling air F is blown out simultaneously with the irradiation of the laser light G onto the coatings 111B, 112B onto the plurality of through holes H. Thereby, although the laser light G is irradiated to the uncoated regions R 110 of the collector 110A, the uncoated regions R 110 of the collector 110B can be efficiently cooled while the cooling air F flowing through the through holes H is circulated. Therefore, it is difficult for the temperature of the uncoated regions R 110 of the collector 110B to increase excessively. As a result, the method of manufacturing a collector with an electrode of the present embodiment can efficiently dry the coatings 111B, 112B and simultaneously suppress an excessive temperature rise of the uncoated regions R 110 of the collector 110B.As explained with reference to FIGS. 1 to 7, in the present embodiment, the laser light G is used as the light for heating. The directivity of the laser light G is larger than the directivity of the infrared light supplied from infrared lamps. Therefore, it is more difficult for the laser light G to be irradiated to the uncoated regions R 110 of the collector 110B than infrared light of infrared lamps. As a result, the method of manufacturing a collector with an electrode of the present embodiment can further prevent an excessive temperature rise in the uncoated regions R 110 of the collector 110B.As explained with reference to FIGS. 1 to 7, the manufacturing method of a power storage device of the present embodiment includes the step of manufacturing a collector with an electrode, the cutting step, and the first electrode manufacturing step. The plurality of through holes H includes the six first through holes HA. The seal frame member 21 has the six fitting portions 2122 that fit into the first through holes HA. Thereby, the seal frame member 21 can be more easily disposed at the desired position of the collector 110A than a structure in which the seal frame member 21 does not have at least two of the fitting portions 2122. Therefore, the seal frame member 21 can reliably close the plurality of through holes H of the collector 110A. As a result, the manufacturing method of a power storage device of the present embodiment can manufacture the power storage device 1 in which occurrence of a short circuit due to nonaqueous electrolyte liquid between adjacent unit cells is suppressed. A "unit cell" includes the positive electrode layer 111A, the negative electrode layer 112A, the separator 12, and the nonaqueous electrolyte liquid.As described with reference to FIGS. 1 to 7, the manufacturing method of a power storage device of the present embodiment includes the step of manufacturing a stack and the step of injecting.In the present embodiment, the seal frame members 21 of the temporarily fixed body are not welded to the plurality of through holes H. Namely, the plurality of regions T are connected to each other via the plurality of through holes H. Therefore, when a nonaqueous electrolyte liquid is injected into the injection ports of the temporarily fixed body, the nonaqueous electrolyte liquid passes through the through holes H and can enter the regions T. Thereby, the time in which the nonaqueous electrolyte liquid is filled in the regions T can be more shortened than a structure in which the seal frame members 21 are welded to the plurality of through holes H (i.e., a structure in which the plurality of through holes H of the seal frame members 21 are reliably closed). As a result, the manufacturing method of a power storage device of the present embodiment can manufacture the power storage device 1 efficiently.As described with reference to FIGS. 1 to 7, the power storage device 1 includes the electrode stack 10, the seal frame 20, and the nonaqueous electrolyte liquid. The bipolar electrode 11 includes the collector 110A, the positive electrode layer 111A, and the negative electrode layer 112A. The collector 110A has the uncoated regions R 110. The seal frame 20 has injection ports communicating with the regions T. The collector 110A has a plurality of through holes H in the uncoated regions R 110. The power storage device 1 can be manufactured according to the manufacturing method of a power storage device of the present embodiment. Therefore, the uncoated regions R 110 of the collector 110A do not have a thermal history of high temperatures (e.g., greater than or equal to 200° C.). That is, the surfaces of the uncoated regions R 110 of the collector 110A are not oxidized. Therefore, the adhesion between the uncoated regions R 110 of the collector 110A and the gasket 20 is excellent. In addition, the conductivity of the uncoated regions R 110 of the collector 110A is better than a structure in which the surfaces of the uncoated regions R 110 are oxidized. As a result, the power storage device 1 has excellent tightness and charge / discharge characteristic. In addition, the injection of the nonaqueous electrolyte liquid at the time of injection may be performed via the through holes H. Thereby, in the manufacture of the power storage device 1, the injection of the nonaqueous electrolyte liquid is quickly completed.As described with reference to FIGS. 1 to 7, in the power storage device 1, the plurality of through holes H include the six first through holes HA. The gasket 20 includes gasket members 21 welded to the uncoated regions R 110 of the first main surfaces S 110A and the second main surfaces S 110B of the respective collectors 110A of the plurality of bipolar electrodes 11. The seal frame 20 has fitting portions 2122 that fit into the first through holes HA. The seal frame members 21 can be disposed at the desired positions of the collectors 110A more than in a structure in which the seal frame members 21 do not have the fitting portions 2122 that fit the first through holes HA. Therefore, the seal frame members 21 can reliably close the plurality of through holes H of the collectors 110A. Thereby, in the power storage device 1, occurrence of short circuits due to nonaqueous electrolyte liquid between adjacent unit cells is suppressed.As described with reference to FIGS. 1 to 7, the plurality of through holes H include the six first through holes HA and the 40 second through holes HB. The seal frame members 21 can be disposed at the desired positions of the collectors 110A more than in a structure in which the seal frame member 21 has a through hole H. Therefore, the seal frame members 21 can more reliably close the plurality of through holes H of the collectors 110A. As a result, in the power storage device 1, occurrence of short circuits due to nonaqueous electrolyte liquid between adjacent unit cells is suppressed.(2) Modified ExamplesIn the present embodiment, the light for heating is the laser light G, but the present disclosure is not limited thereto. The light for heating may be, for example, lamp light or light emitting diode (LED) light. "Lamp light" means light for heating emitted from a lamp light source. "LED light" means light for heating emitted from an LED light source.In the present embodiment, the sheet-shaped collector 110B is used as a collector in the step of manufacturing a collector having an electrode, but the present disclosure is not limited thereto. The sheet-shaped collector 110A may be used as a collector in the step of manufacturing a collector having an electrode. When the sheet-shaped collector 110A is used as the collector, the cutting step is not performed. In the present embodiment, the seal frame 20 includes the plurality of seal frame members 21, but the present disclosure is not limited thereto, and the seal frame 20 does not need to include the plurality of seal frame members 21. In the present embodiment, the plurality of through holes H include the six first through holes HA, but the present disclosure is not limited thereto. There may be two to five or seven or more of the plurality of through holes H, or there may be one through hole H. In the present embodiment, the seal frame members 21 have fitting portions 2122 in the same number as the number of the first through holes HA, but the present disclosure is not limited thereto. The seal frame members 21 may have a number of the fitting portions 2122 that is less than the number of the first through holes HA. Or, the seal frame members 21 do not need to have the fitting portions 2122. In the present embodiment, the first seal frame member 211 does not have a fitting portion that fits into the first through hole HA, but the present disclosure is not limited thereto. The first seal frame member 211 may include a fitting portion that mates with the first through hole HA.In the present embodiment, the gasket member 21 of the bipolar electrode 33 having a gasket member is not welded to the plurality of through holes H, but the present disclosure is not limited thereto. The gasket member 21 of the gasket member bipolar electrode 33 can be welded to the plurality of through holes H.In the present embodiment, the plurality of through holes H along the X axis are formed in the portions of the uncoated regions R 110 located on the both sides of the collector 110A in the Y axis. However, the present disclosure is not limited thereto. The plurality of through holes H may be formed along the X-axis direction in the uncoated regions R 110 on a Y-axis direction side of the collector 110A.Although the shape of the through holes H is circular in the present embodiment, the present disclosure is not limited thereto, and the through holes H need not be circular. The shape of the through holes H may be polygonal or irregular, for example. In the present embodiment, a roll-to-roll apparatus is used for the first coating step, the first drying step, the second coating step, and the second drying step. However, the present disclosure is not limited thereto, and a batch method may be used.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedJP 2018-195587 [0002, 0005]

Claims

A method for manufacturing a collector having an electrode, the method comprising: preparing a collector having a coating having at least a coating of a composite slurry by applying the composite slurry to a collector which is a sheet-shaped collector having a plurality of through holes or a sheet-shaped collector having a plurality of through holes; and preparing a collector having an electrode by blowing cooling air to the through holes simultaneously with irradiation of light for heating to the coating of the collector having a coating and drying the coating to form a positive electrode layer or a negative electrode layer.The method for manufacturing a collector with an electrode according to claim 1, wherein the light for heating is laser light.A manufacturing method of a power storage device, comprising: manufacturing a collector having an electrode, wherein the collector is the sheet-shaped collector manufactured by the method for manufacturing a collector having an electrode according to claim 1 or claim 2; after performing the manufacturing of a collector having an electrode, cutting the sheet-shaped collector, and manufacturing a bipolar electrode, wherein the positive electrode layer is formed on a portion of a first main surface of a sheet-shaped collector and the negative electrode layer is formed on a portion of a second main surface that is on an opposite side from the first main surface; and manufacturing a bipolar electrode having a gasket member by welding at least a portion of a gasket member to uncoated regions of the bipolar electrode where the positive electrode layer and the negative electrode layer are not formed, wherein: the plurality of through holes includes a first through hole, and the gasket member has a fitting portion fittable in the first through hole.The manufacturing method of a power storage device according to claim 3, further comprising: stacking the bipolar electrodes with a gasket member and fabricating a stack having injection ports communicating with regions between adjacent electrodes of the bipolar electrodes; and injecting a nonaqueous electrolyte liquid into the injection ports and injecting the nonaqueous electrolyte liquid into the regions via the through holes.A power storage device comprising: an electrode stack including a plurality of bipolar electrodes laminated over separators; a sealing frame forming regions between bipolar electrodes adjacent to the plurality of bipolar electrodes; A nonaqueous electrolyte liquid accommodated in the regions, wherein: the bipolar electrode includes a sheet-shaped collector, a positive electrode layer formed on a portion of a first main surface of the sheet-shaped collector, and a negative electrode layer formed on a portion of a second main surface of the sheet-shaped collector that is on an opposite side from the first main surface, the sheet-shaped collector has, at peripheral edges of the first main surface and the second main surface, uncoated regions on which the positive electrode layer and the negative electrode layer are not formed and to which the seal frame is welded, the seal frame has injection ports communicating with the regions, and the sheet-shaped collector has a plurality of through holes at the uncoated regions.The power storage device according to claim 5, wherein: the plurality of through holes includes at least a first through hole, the seal frame includes seal frame members welded to the uncoated region of at least one of the first main surface or the second main surface of the sheet-shaped collector of each of the plurality of bipolar electrodes, and the seal frame member includes a fitting portion fittable in the first through hole.The power storage device according to claim 6, wherein the plurality of through holes includes: at least two of the first through holes; and at least one second through hole that has a smaller diameter than a diameter of the first through holes and in which the fitting portion is not inserted.

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