Method and apparatus for manufacturing a member for a lithium ion battery

Abstract

To provide a method and an apparatus for manufacturing members for a lithium-ion battery, capable of securing accuracy in attaching a frame to a current collector while improving manufacturing efficiency of the lithium-ion battery.SOLUTION: A method for manufacturing lithium-ion battery members includes: a first step of manufacturing a transfer sheet in which a plurality of frames are attached onto a belt-shaped film; and a second step of sequentially transferring the plurality of frames from the transfer sheet onto the belt-shaped current collector to manufacture a member sheet which comprises a plurality of serially arranged lithium-ion battery members each including a current collector layer formed by dividing the belt-shaped current collector into predetermined units, and the frame provided at an edge of the current collector layer.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a method and an apparatus for manufacturing a member for a lithium-ion battery.

Background Art

[0002] A lithium-ion battery is a high-capacity secondary battery and has been used in various applications in recent years. For example, a lithium-ion battery is configured by using a plurality of lithium-ion single cells in which a current collector layer, an active material layer, and a separator are laminated. In such a lithium-ion single cell, since an electrolytic solution is enclosed inside, a frame body is provided at the edge of the current collector layer.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] The manufacturing process of a lithium-ion single battery can be carried out on a single sheet basis. For example, as described in Patent Document 1, it is possible to combine a current collector and a frame formed by a method such as screen printing, ejection from a nozzle, injection molding, etc. on a single sheet via a base. However, such a single-sheet method generally takes time and cannot be said to be highly efficient in terms of manufacturing efficiency. Also, as a method different from the method described in Patent Document 1, it is also conceivable to continuously attach the frame to the current collector. For example, it is conceivable to form a current collector band in a strip shape as a roll, and while pulling out the strip-shaped current collector from the roll, sequentially attach the frame onto the moving strip-shaped current collector. However, it is not easy to attach each frame to an appropriate position on the moving current collector, and it is difficult to ensure accuracy. The present invention has been made in view of such problems, and aims to provide a manufacturing method and a manufacturing apparatus for a member for a lithium-ion battery that can improve the manufacturing efficiency of the lithium-ion battery while ensuring the accuracy of attaching the frame to the current collector.

Means for Solving the Problems

[0005] The present invention includes a first step of manufacturing a transfer sheet in which a plurality of frames are attached to a strip-shaped film, and a second step of sequentially transferring the plurality of frames from the transfer sheet to a strip-shaped current collector to manufacture a member sheet in which a plurality of lithium-ion battery members including a current collector layer formed by dividing the strip-shaped current collector into predetermined units and the frames provided at the edges of the current collector layer are connected in series. Alternatively, the present invention is a manufacturing apparatus for a member for a lithium-ion battery, comprising a member sheet manufacturing unit that manufactures a member sheet in which a plurality of lithium-ion battery members including a current collector layer formed by dividing a strip-shaped current collector into predetermined units and the frames provided at the edges of the current collector layer are connected in series by sequentially transferring the plurality of frames from a transfer sheet in which a plurality of frames are attached to a strip-shaped film to the strip-shaped current collector.

Brief Description of the Drawings

[0006]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8A

Figure 8B

Mode for Carrying Out the Invention

[0007] Hereinafter, a method and an apparatus for manufacturing a member for a lithium-ion battery according to the present invention will be described.

[0008] (Assembled Battery) A lithium-ion battery is used in the form of an assembled battery in which a plurality of lithium-ion single batteries (battery cells) are combined and modularized, or a battery pack in which a plurality of such assembled batteries are combined to adjust the voltage and capacity. First, with reference to FIG. 1, an assembled battery 1 in which a plurality of lithium-ion single batteries 10 are combined and modularized will be described. FIG. 1 is a schematic configuration diagram of the assembled battery 1.

[0009] The assembled battery 1 is formed by stacking a plurality of flat lithium-ion single cells 10 in the thickness direction. For example, in FIG. 1, as an example of a plurality of lithium-ion single cells 10, n single cells of lithium-ion single cells 10a to 10n are illustrated. FIG. 1 is merely an example, and the number of lithium-ion single cells 10 included in the assembled battery 1 is not particularly limited.

[0010] Further, the assembled battery 1 has an outer layer film 11 provided so as to cover the periphery of the stacked lithium-ion single cells 10. As the outer layer film 11, a flexible insulating material can be used. However, it is not limited thereto, and for example, a laminate film may be used as the outer layer film 11. As the laminate film, a three-layer laminate film having a nylon film on the outside, an aluminum foil in the center, and an adhesive layer such as modified polypropylene on the inside can be preferably used. The assembled battery 1 is provided with current extraction portions 12 at both ends in the stacking direction of the lithium-ion single cells 10. Through this current extraction portion 12, current is supplied to various electrical products.

[0011] (Lithium-ion single cell) Next, the lithium-ion single cell will be described. The lithium-ion single cell has, for example, a positive electrode current collector layer, a positive electrode active material layer, a separator, a negative electrode active material layer, and a negative electrode current collector layer stacked in this order, has the positive electrode current collector layer and the negative electrode current collector layer as the outermost layers, and has a configuration in which an electrolytic solution is sealed by sealing the outer peripheries of the positive electrode active material layer and the negative electrode active material layer.

[0012] FIG. 2 is a schematic configuration diagram of the lithium-ion single cell 10. In the lithium-ion single cell 10, a positive electrode current collector layer 111, a positive electrode active material layer 113, a separator 130, a negative electrode active material layer 123, and a negative electrode current collector layer 121 are stacked in the order shown in FIG. 2. That is, the positive electrode current collector layer 111 and the negative electrode current collector layer 121 are arranged as the outermost layers. Further, the edges of the positive electrode current collector layer 111 and the negative electrode current collector layer 121 (the outer peripheries of the positive electrode active material layer 113 and the negative electrode active material layer 123) are sealed by a frame body 140, and an electrolytic solution is sealed therein.

[0013] (Positive current collector) As the positive current collector layer 111, a current collector used in a known lithium-ion single battery can be used. For example, a resin current collector composed of a known metal current collector and a conductive material and a resin (such as the resin current collector described in JP-A-2012-150905 and WO 2015 / 005116) can be used. From the viewpoint of battery characteristics and the like, the positive current collector layer 111 is preferably a resin current collector.

[0014] Examples of the metal current collector include one or more metal materials selected from the group consisting of copper, aluminum, titanium, nickel, tantalum, niobium, hafnium, zirconium, zinc, tungsten, bismuth, antimony, and alloys containing one or more of these metals, and stainless alloys. These metal materials may be used in the form of thin plates or metal foils. Further, a material obtained by forming the above metal material on the surface of a substrate composed of other than the above metal material by a method such as sputtering, electrodeposition, or coating may be used as the metal current collector.

[0015] The resin current collector preferably contains a conductive filler and a matrix resin. Examples of the matrix resin include polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), polycycloolefin (PCO), polyethylene terephthalate (PET), polyether nitrile (PEN), polytetrafluoroethylene (PTFE), styrene-butadiene rubber (SBR), polyacrylonitrile (PAN), polymethyl acrylate (PMA), polymethyl methacrylate (PMMA), polyvinylidene fluoride (PVdF), epoxy resin, silicone resin, or a mixture thereof. From the viewpoint of electrical stability, polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), and polycycloolefin (PCO) are preferable, and more preferably polyethylene (PE), polypropylene (PP), and polymethylpentene (PMP).

[0016] The conductive filler is selected from materials having conductivity. Specifically, metals [such as nickel, aluminum, stainless steel (SUS), silver, copper, and titanium], carbon [such as graphite and carbon black (acetylene black, ketjen black, furnace black, channel black, thermal lamp black, etc.)], and mixtures thereof, etc. may be mentioned, but are not limited thereto. These conductive fillers may be used alone or in combination of two or more. Also, these alloys or metal oxides may be used. From the viewpoint of electrical stability, aluminum, stainless steel, carbon, silver, copper, titanium, and mixtures thereof are preferred, silver, aluminum, stainless steel, and carbon are more preferred, and carbon is even more preferred. Further, as these conductive fillers, those obtained by coating a conductive material (a metal among the materials of the above-mentioned conductive fillers) around a particulate ceramic material or a resin material by plating or the like may also be used.

[0017] The average particle diameter of the conductive filler is not particularly limited, but from the viewpoint of the electrical characteristics of the battery, it is preferably 0.01 to 10 μm, more preferably 0.02 to 5 μm, and even more preferably 0.03 to 1 μm. In the present specification, the "particle diameter" means the maximum distance L among the distances between any two points on the contour line of the particle. As the value of the "average particle diameter", a value calculated as the average value of the particle diameters of the particles observed in several to several tens of fields using observation means such as a scanning electron microscope (SEM) or a transmission electron microscope (TEM) shall be adopted.

[0018] The shape (form) of the conductive filler is not limited to a particulate form, and may be a form other than the particulate form, and may also be a form that has been put into practical use as a so-called filler-based conductive resin composition such as a carbon nanotube.

[0019] The conductive filler may be a conductive fiber having a fibrous shape. Examples of the conductive fiber include carbon fibers such as PAN-based carbon fibers and pitch-based carbon fibers, conductive fibers obtained by uniformly dispersing a metal or graphite having good conductivity in synthetic fibers, metal fibers obtained by fiberizing a metal such as stainless steel, conductive fibers obtained by coating the surface of an organic fiber with a metal, and conductive fibers obtained by coating the surface of an organic fiber with a resin containing a conductive substance. Among these conductive fibers, carbon fibers are preferred. Also preferred is a polypropylene resin kneaded with graphene. When the conductive filler is a conductive fiber, its average fiber diameter is preferably 0.1 to 20 μm.

[0020] The weight ratio of the conductive filler in the resin current collector is preferably 5 to 90% by weight, more preferably 20 to 80% by weight. In particular, when the conductive filler is carbon, the weight ratio of the conductive filler is preferably 20 to 30% by weight.

[0021] In addition to the matrix resin and the conductive filler, the resin current collector may contain other components (dispersing agent, crosslinking accelerator, crosslinking agent, colorant, ultraviolet absorber, plasticizer, etc.). Also, a plurality of resin current collectors may be laminated and used, or a resin current collector and a metal foil may be laminated and used.

[0022] The thickness of the positive electrode current collector layer 111 is not particularly limited, but is preferably 5 to 150 μm. When a plurality of resin current collectors are laminated and used as the positive electrode current collector, the overall thickness after lamination is preferably 5 to 150 μm.

[0023] The positive electrode current collector layer 111 can be obtained, for example, by molding a conductive resin composition obtained by melt-kneading a matrix resin, a conductive filler, and, if necessary, a filler dispersing agent used into a film shape by a known method. Examples of the method for molding the conductive resin composition into a film shape include known film molding methods such as the T-die method, the inflation method, and the calendar method. Note that the positive electrode current collector layer 111 can also be obtained by a molding method other than film molding.

[0024] (Positive electrode active material) The positive electrode active material layer 113 is preferably a non-binder body of a mixture containing the positive electrode active material. Here, the non-binder body means that the position of the positive electrode active material in the positive electrode active material layer is not fixed, and the positive electrode active materials and the positive electrode active materials and the positive electrode active material and the current collector are not irreversibly fixed. When the positive electrode active material layer 113 is a non-binder body, since the positive electrode active materials are not irreversibly fixed, the interface between the positive electrode active materials can be separated without mechanically breaking it, and even when stress is applied to the positive electrode active material layer 113, the positive electrode active material can move to prevent the destruction of the positive electrode active material layer 113, which is preferable. The non-binder positive electrode active material layer 113 can be obtained by a method such as making the positive electrode active material layer 113 into a positive electrode active material layer containing the positive electrode active material and the electrolytic solution and not containing a binder. In this specification, the binder means a drug that cannot reversibly fix the positive electrode active materials and the positive electrode active material and the current collector, and examples include known solvent-drying type binders for lithium-ion batteries such as starch, polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose, polyvinyl pyrrolidone, tetrafluoroethylene, styrene-butadiene rubber, polyethylene, and polypropylene. These binders are used by being dissolved or dispersed in a solvent, and by volatilizing or distilling off the solvent, the surface solidifies without showing adhesiveness, so the positive electrode active materials and the positive electrode active material and the current collector cannot be reversibly fixed.

[0025] As the positive electrode active material, a composite oxide of lithium and a transition metal {a composite oxide in which the transition metal is one kind (LiCoO 2 , LiNiO 2 , LiAlMnO 4 , LiMnO 2 and LiMn 2 O 4 etc.), a composite oxide in which the transition metal elements are two kinds (for example, LiFeMnO 4 , LiNi 1 -xCoxO 2 , LiMn 1 -yCoyO 2 , LiNi 1 / 3 Co1 / 3 Al 1 / 3 O 2 and LiNi 0 .8Co 0.15 Al 0.05 O 2 ) and composite oxides having three or more kinds of metal elements [for example, LiM a M’ b M’’cO 2 (M, M’ and M’’ are different transition metal elements respectively, and satisfy a + b + c = 1. For example, LiNi 1 / 3 Mn 1 / 3 Co 1 / 3 O 2 ) etc.], lithium-containing transition metal phosphates (for example, LiFePO 4 , LiCoPO 4 , LiMnPO 4 and LiNiPO 4 ), transition metal oxides (for example, MnO 2 and V 2 O 5 ), transition metal sulfides (for example, MoS 2 and TiS 2 ) and conductive polymers (for example, polyaniline, polypyrrole, polythiophene, polyacetylene, poly-p-phenylene and polyvinylcarbazole) etc. may be mentioned, and two or more kinds may be used in combination. Incidentally, the lithium-containing transition metal phosphate may be one in which a part of the transition metal sites is substituted with other transition metals.

[0026] From the viewpoint of the electrical characteristics of the battery, the volume average particle diameter of the positive electrode active material is preferably 0.01 to 100 μm, more preferably 0.1 to 35 μm, and still more preferably 2 to 30 μm.

[0027] The positive electrode active material may be a coated positive electrode active material in which at least a part of its surface is coated with a coating material containing a polymer compound. When the periphery of the positive electrode active material is coated with a coating material, the volume change of the positive electrode can be alleviated and the expansion of the positive electrode can be suppressed.

[0028] As the polymer compound constituting the coating material, those described as resin for active material coating in JP-A No. 2017-054703, International Publication No. 2015 / 005117, etc. can be preferably used.

[0029] The coating material may contain a conductive agent. As the conductive agent, the same ones as the conductive fillers contained in the positive electrode current collector layer 111 can be preferably used.

[0030] The positive electrode active material layer 113 may contain an adhesive resin. As the adhesive resin, for example, a resin obtained by mixing a small amount of an organic solvent with the resin for non-aqueous secondary battery active material coating described in JP-A No. 2017-054703 and adjusting its glass transition temperature to room temperature or lower, and those described as adhesives in JP-A No. 10-255805, etc. can be preferably used. Note that the adhesive resin means a resin that has adhesiveness (the property of adhering by applying a slight pressure without using water, solvent, heat, etc.) without solidifying even when the solvent component is volatilized and dried. On the other hand, the solution-drying type electrode binder used as a binder means a material that dries and solidifies by volatilizing the solvent component and firmly adheres and fixes the active materials to each other. Therefore, the above-described binder (solution-drying type electrode binder) and the adhesive resin are different materials.

[0031] The positive electrode active material layer 113 may contain an electrolytic solution containing an electrolyte and a non-aqueous solvent. As the electrolyte, those used in known electrolytic solutions can be used, for example, lithium salts of inorganic acids such as LiPF 6 , LiBF 4 , LiSbF 6 , LiAsF 6 , LiN(FSO 2 ) 2 and LiClO 4 , etc., lithium salts of organic acids such as LiN(CF 3 SO 2 ) 2 , LiN(C 2 F 5 SO 2 ) 2 and LiC(CF 3 SO 2 )3 Examples of the lithium salts of organic acids include lithium salts of organic acids such as LiN(FSO 2 ) 2 (also referred to as LiFSI) is preferred.

[0032] As the non-aqueous solvent, those used in known electrolytes can be used, for example, lactone compounds, cyclic or chain carbonates, chain carboxylic acid esters, cyclic or chain ethers, phosphate esters, nitrile compounds, amide compounds, sulfones, sulfolane, etc. and mixtures thereof can be used.

[0033] Examples of the lactone compounds include 5-membered ring (such as γ-butyrolactone and γ-valerolactone) and 6-membered ring lactone compounds (such as δ-valerolactone).

[0034] Examples of the cyclic carbonates include propylene carbonate, ethylene carbonate, and butylene carbonate. Examples of the chain carbonates include dimethyl carbonate, methyl ethyl carbonate, diethyl carbonate, methyl-n-propyl carbonate, ethyl-n-propyl carbonate, and di-n-propyl carbonate.

[0035] Examples of the chain carboxylic acid esters include methyl acetate, ethyl acetate, propyl acetate, and methyl propionate. Examples of the cyclic ethers include tetrahydrofuran, tetrahydropyran, 1,3-dioxolane, and 1,4-dioxane. Examples of the chain ethers include dimethoxymethane and 1,2-dimethoxyethane.

[0036] Examples of the phosphate ester include trimethyl phosphate, triethyl phosphate, ethyldimethyl phosphate, diethylmethyl phosphate, tripropyl phosphate, tributyl phosphate, tris(trifluoromethyl) phosphate, tris(trichloromethyl) phosphate, tris(trifluoroethyl) phosphate, tris(triperfluoroethyl) phosphate, 2-ethoxy-1,3,2-dioxaphospholane-2-one, 2-trifluoroethoxy-1,3,2-dioxaphospholane-2-one, 2-methoxyethoxy-1,3,2-dioxaphospholane-2-one, and the like. Examples of the nitrile compound include acetonitrile and the like. Examples of the amide compound include DMF and the like. Examples of the sulfone include dimethyl sulfone, diethyl sulfone, and the like. The non-aqueous solvent may be used alone or in combination of two or more.

[0037] Among the non-aqueous solvents, lactone compounds, cyclic carbonates, chain carbonates, and phosphate esters are preferable from the viewpoints of battery output and charge-discharge cycle characteristics. More preferably, lactone compounds, cyclic carbonates, and chain carbonates are used. Particularly preferably, a mixed solution of cyclic carbonate and chain carbonate is used. Most preferably, a mixed solution of ethylene carbonate (EC) and dimethyl carbonate (DMC), or a mixed solution of ethylene carbonate (EC) and propylene carbonate (PC) is used.

[0038] The positive electrode active material layer 113 may contain a conductive assistant. As the conductive assistant, a conductive material similar to the conductive filler contained in the positive electrode current collector layer 111 can be preferably used.

[0039] The weight ratio of the conductive assistant in the positive electrode active material layer 113 is preferably 3 to 10% by weight.

[0040] The thickness of the positive electrode active material layer 113 is not particularly limited, but from the viewpoint of battery performance, it is preferably 150 to 600 μm, and more preferably 200 to 450 μm.

[0041] (Negative electrode current collector) As the negative electrode current collector layer 121, the same structure as that described for the positive electrode current collector layer 111 can be appropriately selected and used, and it can be obtained by the same method. From the viewpoint of battery characteristics and the like, the negative electrode current collector layer 121 is preferably a resin current collector. The thickness of the negative electrode current collector layer 121 is not particularly limited, but is preferably 5 to 150 μm.

[0042] (Negative electrode active material) The negative electrode active material layer 123 is preferably a non-binder of a mixture containing a negative electrode active material. The reason why the negative electrode active material layer is preferably a non-binder, and the method for obtaining the non-binder negative electrode active material layer 123 are the same as the reason why the positive electrode active material layer 113 is preferably a non-binder and the method for obtaining the non-binder positive electrode active material layer 113.

[0043] Examples of the negative electrode active material include carbon-based materials [graphite, non-graphitizable carbon, amorphous carbon, resin fired bodies (such as those obtained by firing and carbonizing phenol resins and furan resins, etc.), cokes (such as pitch coke, needle coke, and petroleum coke, etc.), and carbon fibers, etc.], silicon-based materials [silicon, silicon oxide (SiOx), silicon-carbon composites (those obtained by coating the surface of carbon particles with silicon and / or silicon carbide, those obtained by coating the surface of silicon particles or silicon oxide particles with carbon and / or silicon carbide, and silicon carbide, etc.), and silicon alloys (such as silicon-aluminum alloy, silicon-lithium alloy, silicon-nickel alloy, silicon-iron alloy, silicon-titanium alloy, silicon-manganese alloy, silicon-copper alloy, and silicon-tin alloy, etc.), etc.], conductive polymers (such as polyacetylene and polypyrrole, etc.), metals (such as tin, aluminum, zirconium, and titanium, etc.), metal oxides (such as titanium oxides and lithium-titanium oxides, etc.), and metal alloys (such as lithium-tin alloy, lithium-aluminum alloy, and lithium-aluminum-manganese alloy, etc.), etc., and mixtures of these with carbon-based materials, etc. Among the above negative electrode active materials, those that do not contain lithium or lithium ions inside may be subjected to a pre-doping treatment to make a part or all of the negative electrode active material contain lithium or lithium ions in advance.

[0044] Among these, from the viewpoint of battery capacity and the like, carbon-based materials, silicon-based materials, and mixtures thereof are preferable. As the carbon-based materials, graphite, graphitizable carbon, and amorphous carbon are more preferable. As the silicon-based materials, silicon oxide and silicon-carbon composites are more preferable.

[0045] From the viewpoint of the electrical characteristics of the battery, the volume average particle diameter of the negative electrode active material is preferably 0.01 to 100 μm, more preferably 0.1 to 20 μm, and even more preferably 2 to 10 μm.

[0046] In this specification, the volume average particle diameter of the negative electrode active material means the particle diameter (Dv50) at the integrated value of 50% in the particle size distribution obtained by the Microtrac method (laser diffraction / scattering method). The Microtrac method is a method for obtaining a particle size distribution by using scattered light obtained by irradiating particles with laser light. For the measurement of the volume average particle diameter, Microtrac manufactured by Nikkiso Co., Ltd. or the like can be used.

[0047] The negative electrode active material may be a coated negative electrode active material in which at least a part of its surface is coated with a coating material containing a polymer compound. When the periphery of the negative electrode active material is coated with a coating material, the volume change of the negative electrode can be alleviated, and the expansion of the negative electrode can be suppressed.

[0048] As the coating material, the same materials as those for the coating material constituting the coated positive electrode active material can be preferably used.

[0049] The negative electrode active material layer 123 contains an electrolytic solution containing an electrolyte and a non-aqueous solvent. As the composition of the electrolytic solution, the same electrolytic solution as that contained in the positive electrode active material layer 113 can be preferably used.

[0050] The negative electrode active material layer 123 may contain a conductive assistant. As the conductive assistant, the same conductive materials as the conductive fillers contained in the positive electrode active material layer 113 can be preferably used.

[0051] The weight ratio of the conductive assistant in the negative electrode active material layer 123 is preferably 2 to 10% by weight.

[0052] The negative electrode active material layer 123 may contain a tacky resin. As the tacky resin, the same ones as the tacky resins that are optional components of the positive electrode active material layer 113 can be preferably used.

[0053] The thickness of the negative electrode active material layer 123 is not particularly limited, but from the viewpoint of battery performance, it is preferably 150 to 600 μm, and more preferably 200 to 450 μm.

[0054] (Separator) Examples of the separator 130 include porous films made of polyethylene or polypropylene, laminated films of the above porous films (such as laminated films of porous polyethylene films and porous polypropylene), non-woven fabrics made of synthetic fibers (such as polyester fibers and aramid fibers) or glass fibers, and those with ceramic fine particles such as silica, alumina, and titania adhered to their surfaces. Separators used in known lithium-ion single batteries are mentioned.

[0055] (Frame body) The lithium-ion single battery 10 has a structure in which the electrolyte is sealed by sealing the edges of the positive electrode current collector layer 111 and the negative electrode current collector layer 121 with a frame body 140. The frame body 140 is disposed between the positive electrode current collector layer 111 and the negative electrode current collector layer 121 and has a function of sealing the outer peripheries of the positive electrode active material layer 113, the negative electrode active material layer 123, and the separator 130.

[0056] Note that FIG. 2 shows a case where a part of the separator 130 is configured to enter the frame body 140. That is, in FIG. 2, the width of the separator 130 is larger than that of the positive electrode active material layer 113 and the negative electrode active material layer 123 surrounded by the outer periphery in the frame body 140, and a part of it bites into the frame body 140. However, the embodiment is not limited to this. For example, the widths of the positive electrode active material layer 113, the negative electrode active material layer 123, and the separator 130 may be configured to be the same in the horizontal direction of FIG. 2. Further, the frame body 140 shown in FIG. 2 may be integrally manufactured, or may be manufactured, for example, by separately manufacturing and joining the positive electrode side frame body and the negative electrode side frame body.

[0057] The frame body 140 is not particularly limited as long as it is a material durable against the electrolytic solution, but a polymer material is preferable, and a thermosetting polymer material is more preferable. Specifically, epoxy resins, polyolefin resins, polyurethane resins, polyvinylidene fluoride resins, etc. can be mentioned, and epoxy resins are preferable because of their high durability and ease of handling.

[0058] The frame body 140 is, for example, a frame-shaped member as shown in FIG. 3. In the process of manufacturing the lithium ion single battery 10, the frame body 140 is attached to either the positive electrode current collector layer 111 or the negative electrode current collector layer 121. In the following description, when the positive electrode side and the negative electrode side are not particularly distinguished, the positive electrode current collector layer 111 and the negative electrode current collector layer 121 are also simply referred to as current collectors. That is, the frame body 140 is attached to the current collector on the positive electrode side or the negative electrode side. Further, after forming the positive electrode active material layer 113, the negative electrode active material layer 123, the separator 130, etc. inside the frame body 140, the lithium ion single battery 10 can be manufactured by further forming the other current collector. Here, manufacturing the lithium ion single battery 10 by attaching the frame body 140 to the current collector one by one takes time and is not efficient in terms of manufacturing efficiency.

[0059] It is also conceivable to continuously attach the frame body 140 to the current collector. For example, it is conceivable to form the current collecting band in a strip shape and make it into a roll, and while pulling out the strip-shaped current collector from the roll, sequentially attach the frame body 140 onto the moving strip-shaped current collector. However, it is not easy to attach the frame bodies 140 one by one at appropriate positions on the moving current collector, and it is difficult to ensure accuracy.

[0060] Therefore, in the present invention, by executing the first step and the second step described below, the attachment of the frame body 140 to the current collector is continuously and smoothly executed, thereby improving the manufacturing efficiency of the lithium-ion battery while ensuring the accuracy of the attachment of the frame body 140 to the current collector.

[0061] (First step) In the first step, as shown in FIG. 4, a transfer sheet 22 having a plurality of frame bodies 140 attached to a strip-shaped film 21 is manufactured. In FIG. 4, four frame bodies 140a to 140d are shown as the plurality of frame bodies 140.

[0062] As the film 21, any material can be selected as long as the attachment and peeling of the frame body 140 are possible. As an example, the film 21 is a resin material such as polyethylene terephthalate (PET). In order to facilitate the peeling of the frame body 140 later, it is also possible to apply a release agent such as silicone to the surface of the film 21 on the side where the frame body 140 is attached.

[0063] As shown in FIG. 4, for example, the plurality of frames 140 are attached to be arranged in a line (straight) with respect to the strip-shaped film 21. In FIG. 4, a state is shown in which a plurality of frames 140 are arranged on the strip-shaped film 21 without gaps, but a certain gap may be provided between the frames 140. By providing a gap between the frames 140, it becomes easier to bend the sheet and it becomes easier to wind and manage it in a roll shape. On the other hand, when the gap between the frames 140 becomes large, the dust generated when cutting the strip-shaped current collector 23 described later increases, and it is also not preferable from the viewpoint of yield. Considering the above points, it is preferable that the gap between the frames 140 is appropriately adjusted.

[0064] The attachment of the frame 140 to the film 21 will be described with reference to FIG. 5. FIG. 5 is a diagram showing a configuration example of a transfer sheet manufacturing apparatus 31 for manufacturing a transfer sheet 22 to which a plurality of frames 140 are attached to a strip-shaped film 21. For example, the transfer sheet manufacturing apparatus 31 includes a splicer 311 and an attachment apparatus 312.

[0065] The transfer sheet manufacturing apparatus 31 pulls out the film 21 from the roll 21' around which the film 21 is wound at a predetermined speed. For example, the transfer sheet manufacturing apparatus 31 moves the film 21 in the direction indicated by the arrow in FIG. 5 while maintaining the ear end at a fixed position by EPC (Edge Position Control) or while maintaining the center at a fixed position by CPC (Center Position Control). Although two rolls 21' are shown in FIG. 5, one is a spare. The splicer 311 can shorten or eliminate the stop time of the apparatus by switching the pulling-out destination of the film 21 to the other roll 21' when all of the film 21 has been pulled out from one roll 21'.

[0066] The film 21 advances in the direction indicated by the arrow in FIG. 5, and the frame 140 is attached by the attachment apparatus 312. For example, the attachment apparatus 312 includes a holding mechanism 3121 and a crimping mechanism 3122.

[0067] The holding mechanism 3121 places the frame 140 on the film 21. That is, the holding mechanism 3121 holds the pre-manufactured frame 140 and moves it to the position shown in FIG. 5. Note that the method for the holding mechanism 3121 to hold the frame 140 is not particularly limited. For example, the holding mechanism 3121 may include a robot arm and mechanically hold the frame 140. Also, for example, the holding mechanism 3121 may include a suction pad and hold the frame 140 by generating negative pressure in the suction pad.

[0068] The crimping mechanism 3122 manufactures the transfer sheet 22 by crimping the film 21 and the frame 140. For example, the crimping mechanism 3122 is a press roll that sandwiches and presses the film 21 and the frame 140, and adheres the frame 140 to the film 21. Here, the crimping mechanism 3122 may heat the film 21 and the frame 140 for thermocompression bonding. Also, the manufactured transfer sheet 22 is wound in a roll shape. Hereinafter, the roll with the transfer sheet wound thereon is referred to as a transfer roll 22'.

[0069] Note that the method for manufacturing the frame 140 is not particularly limited. For example, the frame 140 can be formed into a predetermined shape by cutting a sheet or block made of a predetermined material such as a polymer material. For example, the frame 140 can be obtained by punching out from a material sheet made of a predetermined material.

[0070] Also, for example, the frame 140 can be formed into a predetermined shape by a method using a mold such as injection molding. For example, a mold having an internal space of a predetermined shape is prepared in advance, and the frame 140 can be formed into a predetermined shape by performing injection molding on the mold.

[0071] Further, for example, the frame body 140 can be formed into a predetermined shape by discharging or applying a predetermined material onto a base material. For example, the frame body 140 can be formed into a predetermined shape by a dispenser. That is, under the control of the dispenser, the frame body 140 can be formed by discharging a predetermined amount of a predetermined material from a nozzle onto the base material. As another example, the frame body 140 can be formed by applying a predetermined material onto the base material in a predetermined shape by a coater such as a screen printing machine.

[0072] More specifically, the frame body 140 can be formed by discharging or applying a predetermined material onto the base material in a predetermined shape by a dispenser, a coater, or the like, and then peeling it off from the base material after drying. Alternatively, the frame body 140 can be formed by discharging or applying a predetermined material such as a two-component curable resin or a UV curable resin onto the base material in a predetermined shape by a dispenser, a coater, or the like, and then peeling it off from the base material after curing.

[0073] In addition, the frame body 140 can be formed into a predetermined shape by various methods. For example, the frame body 140 may be formed into a predetermined shape by assembling a sheet or a block made of a predetermined material so as to have a predetermined shape. Also, for example, the frame body 140 may be formed into a predetermined shape by arranging a sheet made of a predetermined material in the longitudinal direction of the base material and discharging or applying the material in the vertical direction. Alternatively, the frame body 140 can also be manufactured by an arbitrary type of 3D printer.

[0074] Also, in FIG. 5, the case where the prefabricated frame body 140 is attached to the film 21 by crimping has been described, but the embodiment is not limited thereto. For example, the frame body 140 may be attached to the film 21 by forming the frame body 140 on the film 21. For example, using the film 21 as a base material, a predetermined material can be discharged or applied onto the film 21 in a predetermined shape by a dispenser, a coater, or the like, thereby forming the frame body 140 on the film 21.

[0075] (Second step) In the second step, a plurality of frame bodies 140 are sequentially transferred from the transfer sheet 22 to the strip-shaped current collector 23, thereby manufacturing a member sheet 24 in which a plurality of lithium-ion battery members including a current collector layer formed by dividing the strip-shaped current collector 23 into predetermined units and the frame body 140 provided at the edge of the current collector layer are connected in series. Hereinafter, the second step will be described with reference to FIG. 6. FIG. 6 is a diagram showing a configuration example of a member sheet manufacturing apparatus 32 that manufactures the member sheet 24 by performing transfer of the frame body 140 to the strip-shaped current collector 23. For example, the member sheet manufacturing apparatus 32 includes a splicer 321 and a transfer apparatus 322.

[0076] The member sheet manufacturing apparatus 32 pulls out the strip-shaped current collector 23 from the current collector roll 23' around which the strip-shaped current collector 23 is wound at a predetermined speed. Although two current collector rolls 23' are shown in FIG. 6, one of them is a spare. When the splicer 321 has pulled out all of the strip-shaped current collector 23 from one current collector roll 23', the splicer 321 can switch the pulling-out destination of the strip-shaped current collector 23 to the other current collector roll 23', thereby shortening or eliminating the stop time of the apparatus.

[0077] Further, the member sheet manufacturing apparatus 32 pulls out the transfer sheet 22 from the transfer roll 22' at a predetermined speed. Here, the member sheet manufacturing apparatus 32 performs control so that the speed at which the strip-shaped current collector 23 is pulled out from the current collector roll 23' is the same as the speed at which the transfer sheet 22 is pulled out from the transfer roll 22'. That is, the member sheet manufacturing apparatus 32 pulls out the strip-shaped current collector 23 and the transfer sheet 22 from the current collector roll 23' and the transfer roll 22' respectively at a predetermined speed. In FIG. 6, only one transfer roll 22' is shown, but it may be configured to be switchable to a spare transfer roll 22' by a splicer.

[0078] The transfer device 322 sequentially transfers a plurality of frames 140 from the transfer sheet 22 to the strip-shaped current collector 23 pulled out from the current collector roll 23'. Here, the transfer device 322 will be described in more detail with reference to FIG. 7. For example, as shown in FIG. 7, the transfer device 322 includes a transfer mechanism 3221 and a separation mechanism 3222.

[0079] The transfer mechanism 3221 presses the transfer sheet 22 and the strip-shaped current collector 23 together. For example, the transfer mechanism 3221 is a press roll that sandwiches and presses the transfer sheet 22 and the strip-shaped current collector 23, and adheres the transfer sheet 22 to the strip-shaped current collector 23. More specifically, the transfer sheet 22 is a sheet manufactured by attaching the frame 140 to the film 21. The transfer mechanism 3221 adheres the surface of the transfer sheet 22 on the side of the frame 140 to the strip-shaped current collector 23. Here, the transfer mechanism 3221 may heat the transfer sheet 22 and the strip-shaped current collector 23 and perform thermocompression bonding.

[0080] The separation mechanism 3222 separates the transfer sheet 22 after the frame 140 has been transferred to the strip-shaped current collector 23 into the film 21 and the frame 140. In other words, the separation mechanism 3222 peels the film 21 from the frame 140 after the transfer of the frame 140 to the strip-shaped current collector 23 is completed. The separation mechanism 3222 may wind up the film 21 separated from the frame 140 in a roll shape as shown in FIG. 7.

[0081] As shown in FIG. 7, the transfer device 322 manufactures the member sheet 24 by sequentially transferring a plurality of frames 140 from the transfer sheet 22 to the belt-shaped current collector 23. That is, the member sheet 24 is composed of a belt-shaped current collector 23 and a plurality of frames 140. The belt-shaped current collector 23 in the member sheet 24 is later divided into predetermined units and becomes the positive electrode current collector layer 111 or the negative electrode current collector layer 121 shown in FIG. 2. For example, the belt-shaped current collector 23 is cut with the length of the frame 140 as a predetermined unit. That is, the member sheet 24 is a sheet in which a plurality of members for a lithium-ion battery including the positive electrode current collector layer 111 or the negative electrode current collector layer 121 and the frame 140 provided at the edge of the current collector layer are connected in series.

[0082] Note that the transfer device 322 is an example of a member sheet manufacturing unit. Further, the member sheet manufacturing apparatus 32 is an example of an apparatus for manufacturing a member for a lithium-ion battery.

[0083] When the belt-shaped current collector 23 is on the positive electrode side, the belt-shaped current collector 23 in the member sheet 24 is later divided into predetermined units and becomes the positive electrode current collector layer 111. That is, the member sheet 24 becomes a sheet in which a plurality of members for a lithium-ion battery including the positive electrode current collector layer 111 and the frame 140 are connected in series. By further forming the positive electrode active material layer 113, the separator 130, the negative electrode active material layer 123, and the negative electrode current collector layer 121 on such a member sheet 24, the lithium-ion single battery 10 shown in FIG. 2 can be manufactured. Further, for example, as shown in FIG. 1, a lithium-ion battery can be manufactured by combining a plurality of lithium-ion single batteries 10 to form a battery pack 1.

[0084] Alternatively, when the strip-shaped current collector 23 is on the negative electrode side, the strip-shaped current collector 23 in the member sheet 24 is later divided into the negative electrode current collector layer 121 for each predetermined unit. That is, the member sheet 24 becomes a sheet in which a plurality of members for a lithium-ion battery including the negative electrode current collector layer 121 and the frame body 140 are connected in series. By further forming the negative electrode active material layer 123, the separator 130, the positive electrode active material layer 113, and the positive electrode current collector layer 111 on such a member sheet 24, the lithium-ion single battery 10 shown in FIG. 2 can be manufactured. Furthermore, for example, by combining a plurality of lithium-ion single batteries 10 as shown in FIG. 1 to form a battery pack 1, a lithium-ion battery can be manufactured.

[0085] Thus, according to the first step and the second step, in a series of processes until the lithium-ion battery is manufactured, the attachment of the frame body 140 to the current collector can be performed continuously and smoothly, and thus the manufacturing efficiency of the lithium-ion battery can be improved. Furthermore, according to the first step and the second step, the accuracy of attaching the frame body 140 to the current collector can also be ensured.

[0086] Also, the first step of manufacturing the transfer sheet 22 can be performed separately from the second step which is a part of the manufacturing line of the lithium-ion battery. That is, the attachment of the frame body 140 to the film 21 in the first step can be performed accurately over time without affecting the manufacturing efficiency of the lithium-ion battery. Also, the frame body 140 attached accurately to the film 21 is directly transferred to the current collector in the second step. That is, according to the first step and the second step, the accuracy of attaching the frame body 140 to the current collector can be improved, and thus the quality of the lithium-ion battery can be improved.

[0087] Also, the frame 140 can be formed on the film 21. Here, since the film 21 is to be separated from the frame 140 later, even if it is altered by post-treatment such as heat treatment or ultraviolet irradiation, it will not affect the quality of the lithium-ion battery. That is, when forming the frame 140 on the film 21, it is possible to further perform types of post-treatment that are difficult to execute when forming the frame 140 on the current collector. Therefore, when forming the frame 140 on the film 21, the degree of freedom regarding the material and formation method of the frame 140 can be increased, and it is also possible to improve the quality through post-treatment.

[0088] Note that although it has been described that the frame 140 is attached to the current collector in the first and second steps, it may be the case where only one of the positive electrode side and the negative electrode side of the frame 140 is attached. That is, instead of manufacturing the frame 140 shown in FIG. 2 integrally, the positive electrode side frame and the negative electrode side frame may be manufactured separately and then joined to manufacture the frame 140.

[0089] For example, when the strip-shaped current collector 23 is on the positive electrode side, the member sheet 24 is a sheet in which a plurality of lithium-ion battery members including the positive electrode current collector layer 111 and the positive electrode side frame are connected in series. By further forming the positive electrode active material layer 113, the separator 130, the negative electrode active material layer 123, the negative electrode current collector layer 121, and the negative electrode side frame on such a member sheet 24, the lithium-ion single battery 10 shown in FIG. 2 can be manufactured.

[0090] Alternatively, when the strip-shaped current collector 23 is on the negative electrode side, the member sheet 24 is a sheet in which a plurality of lithium-ion battery members including the negative electrode current collector layer 121 and the negative electrode side frame are connected in series. By further forming the negative electrode active material layer 123, the separator 130, the positive electrode active material layer 113, the positive electrode current collector layer 111, and the positive electrode side frame on such a member sheet 24, the lithium-ion single battery 10 shown in FIG. 2 can be manufactured.

[0091] (Third Step) Subsequent to the above-described first and second steps, a third step of forming an active material layer inside the frame body 140 transferred onto the strip-shaped current collector 23 may be further performed. In other words, in the third step, an active material layer is formed inside the frame body 140 in the member sheet 24. Hereinafter, the third step will be described with reference to FIG. 6. For example, the member sheet manufacturing apparatus 32 further includes an active material layer forming apparatus 323 in addition to the splicer 321 and the transfer apparatus 322.

[0092] The active material layer forming apparatus 323 supplies the active material 25 to the member sheet 24 manufactured by the transfer apparatus 322 and moving at a predetermined speed. For example, the active material layer forming apparatus 323 performs pre-treatment such as loosening lumps on the active material 25 conveyed by a screw conveyor, and then controls the switching of a shutter so that only a predetermined amount of the active material 25 is supplied to one frame body 140. Further, the active material layer forming apparatus 323 forms an active material layer inside the frame body 140 by pressing the active material 25 supplied inside the frame body 140 with a press roll. The member sheet 24 after the active material layer is formed inside the frame body 140 is also referred to as an active material layer formed member sheet 26.

[0093] As described with reference to FIG. 2, there are the positive electrode side active material 25 and the negative electrode side active material 25 in the active material. The active material layer forming apparatus 323 supplies the active material 25 according to the strip-shaped current collector 23 in the member sheet 24. That is, the active material layer forming apparatus 323 supplies the positive electrode side active material 25 when the strip-shaped current collector 23 is on the positive electrode side, and supplies the negative electrode side active material 25 when the strip-shaped current collector 23 is on the negative electrode side.

[0094] When the strip-shaped current collector 23 is on the positive electrode side, the strip-shaped current collector 23 in the member sheet 26 with the active material layer already formed is later divided into predetermined units to become the positive electrode current collector layer 111, and the active material layer formed inside the frame body 140 provided at the edge of the positive electrode current collector layer 111 becomes the positive electrode active material layer 113. That is, the member sheet 26 with the active material layer already formed becomes a sheet in which a plurality of members for a lithium ion battery including the positive electrode current collector layer 111, the positive electrode active material layer 113, and the frame body 140 are connected in series. By further forming the separator 130, the negative electrode active material layer 123, and the negative electrode current collector layer 121 on such a member sheet 26 with the active material layer already formed, the lithium ion single battery 10 shown in FIG. 2 can be manufactured. Alternatively, when the strip-shaped current collector 23 is on the negative electrode side, the strip-shaped current collector 23 in the member sheet 26 with the active material layer already formed is later divided into predetermined units to become the negative electrode current collector layer 121, and the active material layer formed inside the frame body 140 provided at the edge of the negative electrode current collector layer 121 becomes the negative electrode active material layer 123. That is, the member sheet 26 with the active material layer already formed becomes a sheet in which a plurality of members for a lithium ion battery including the negative electrode current collector layer 121, the negative electrode active material layer 123, and the frame body 140 are connected in series. By further forming the separator 130, the positive electrode active material layer 113, and the positive electrode current collector layer 111 on such a member sheet 26 with the active material layer already formed, the lithium ion single battery 10 shown in FIG. 2 can be manufactured. As described above, instead of manufacturing the frame body 140 integrally, the frame body 140 may be manufactured by manufacturing the positive electrode side frame body and the negative electrode side frame body respectively and then joining them. Further, for example, by combining a plurality of lithium ion single batteries 10 as shown in FIG. 1 to form a battery pack 1, a lithium ion battery can be manufactured.

[0095] Thus, according to the first step, the second step, and the third step, in a series of processes until the lithium ion battery is manufactured, the attachment of the frame body 140 to the current collector and the formation of the active material layer can be executed continuously and smoothly, and thus the manufacturing efficiency of the lithium ion battery can be improved.

[0096] Although not shown in Fig. 6, the third step may be carried out in a chamber. For example, a decompression chamber may be provided to include the active material layer forming apparatus 323. Further, in the decompression chamber, fine particles generated during the formation of the active material layer may be sucked. Thereby, the incorporation of impurities can be reduced, and the quality of the lithium ion battery can be further improved.

[0097] (Splice part) Rolls such as the current collector roll 23' will eventually be used up, so it is necessary to appropriately switch to a new roll. Further, in order to prevent the apparatus from stopping for a long time when switching the roll, it is preferable to shorten or eliminate the stop time of the apparatus by means of a splicer 321 or the like. However, when switching the roll, joints usually occur. For example, when one of the two current collector rolls 23' shown in Fig. 6 is used up and switched to the other current collector roll 23' by the splicer 321, a joint occurs in the strip-shaped current collector 23 drawn out from the current collector roll 23'. Hereinafter, the portion corresponding to the joint of the roll such as the current collector roll 23' is referred to as a splice part. Also, the splice part of the current collector roll 23' is referred to as a splice part 231.

[0098] From the viewpoint of quality, the splice part is generally discarded without being used. Here, when the frame body 140 is also transferred from the transfer sheet 22 to the splice part 231, the frame body 140 will be discarded together with the splice part 231, which is not preferable from the viewpoint of yield.

[0099] Therefore, the transfer sheet 22 may have a blank part 221 to which the frame body 140 is not attached at a position corresponding to the splice part 231 of the current collector roll 23'. Specifically, as shown in Fig. 8A, when a part of the strip-shaped current collector 23 becomes the splice part 231, the transfer sheet 22 is manufactured so that the portion pressure-bonded to the splice part 231 by the transfer mechanism 3221 becomes the blank part 221.

[0100] Alternatively, as shown in FIG. 8B, the portion of the transfer sheet 22 that is crimped to the splice portion 231 may be a blank portion 221, and the transfer sheet 22 may be manufactured such that the blank portion 221 corresponds to the splice portion 222 of the transfer roll 22'. That is, although not shown in FIG. 6, since the transfer roll 22' is also a roll, a joint (splice portion 222) will also occur in the transfer sheet 22. By aligning the positions of the splice portion 222 of the transfer roll 22', the splice portion 231 of the current collector roll 23', and the blank portion 221, the amount of waste of the current collector and the frame body 140 can be minimized.

[0101] (Modification example) In FIGS. 5 and 6, the transfer sheet manufacturing apparatus 31 and the member sheet manufacturing apparatus 32 have been described separately, but the transfer sheet manufacturing apparatus 31 may be included in the member sheet manufacturing apparatus 32. That is, the member sheet manufacturing apparatus 32 may further include a transfer sheet manufacturing unit for manufacturing a transfer sheet in addition to the member sheet manufacturing unit. In this case, the step of winding the transfer sheet 22 into the transfer roll 22' may be omitted.

Explanation of symbols

[0102] One set of batteries 11 Outer film 12 Current extraction part 10 Lithium ion single battery 111 Positive electrode current collector layer 113 Positive electrode active material layer 130 Separator 123 Negative electrode active material layer 121 Negative electrode current collector layer 140 Frame body 21 Film 21' Roll 22 Transfer sheet 22' Transfer roll 221 Blank portion 222 Splice portion 23 Strip-shaped current collector 23' Current collector roll 231 Splice portion 24 member sheet 25 active material 26 member sheet with active material layer formed 31 Transfer sheet manufacturing apparatus 311 Splicer 312 Mounting device 3121 Holding mechanism 3122 Crimping mechanism 32 Member sheet manufacturing apparatus 321 Splicer 322 Transfer device 3221 Transfer mechanism 3222 Separation mechanism 323 Active material layer forming device

Claims

1. A first step of manufacturing a transfer sheet having a plurality of frames attached to a strip-shaped film; A second step of manufacturing a member sheet in which a plurality of members for a lithium-ion battery are connected in series, the member for a lithium-ion battery including a current collector layer formed by sequentially transferring the plurality of frames from the transfer sheet to a strip-shaped current collector and dividing the strip-shaped current collector into predetermined units, and the frames provided at the edges of the current collector layer; A method for manufacturing a member for a lithium-ion battery, including the above steps.

2. The second step includes pulling out the strip-shaped current collector and the transfer sheet from a current collector roll around which the strip-shaped current collector is wound and a transfer roll around which the transfer sheet is wound at a predetermined speed, and sequentially transferring the plurality of frames from the transfer sheet to the strip-shaped current collector moving at the predetermined speed by a transfer mechanism. The method for manufacturing a member for a lithium-ion battery according to claim 1.

3. The transfer sheet has a blank portion where the frame is not attached at a position corresponding to the splice portion of the current collector roll. The method for manufacturing a member for a lithium-ion battery according to claim 2.

4. The blank portion corresponds to the splice portion of the transfer roll. The method for manufacturing a member for a lithium-ion battery according to claim 3.

5. The second step further includes separating the transfer sheet after transferring the frame to the strip-shaped current collector into the film and the frame. The method for manufacturing a member for a lithium-ion battery according to any one of claims 1 to 4.

6. The method for manufacturing a member for a lithium-ion battery according to any one of claims 1 to 5 further includes a third step of forming an active material layer inside the frame transferred to the strip-shaped current collector.

7. The frame is formed on the film. The method for manufacturing a member for a lithium-ion battery according to any one of claims 1 to 6.

8. A member sheet manufacturing apparatus for manufacturing a member sheet in which a plurality of members for a lithium-ion battery are connected in series, the member for a lithium-ion battery including a current collector layer formed by sequentially transferring a plurality of frames from a transfer sheet having the plurality of frames attached to a strip-shaped film to the strip-shaped current collector and dividing the strip-shaped current collector into predetermined units, and the frames provided at the edges of the current collector layer, the apparatus comprising a member sheet manufacturing unit.

9. The manufacturing apparatus for a member for a lithium ion battery according to claim 8, further comprising a transfer sheet manufacturing unit that manufactures the transfer sheet.

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