JP6618352B2 - Multilayer battery manufacturing equipment - Google Patents

Description

  The present invention relates to a laminated battery manufacturing apparatus.

  Conventionally, as a process of manufacturing a bipolar battery, while supplying a first current collector sheet from a roll wound with a sheet-like current collector, an insulator is provided on the current collector at predetermined intervals. A battery structure is formed by laminating a plurality of layers, and a negative electrode layer, an electrolyte layer, and a positive electrode layer are stacked between a pair of insulators, and a second current collector supplied from another roll is separated from the battery structure and the insulation. After arranging on the body, the method of cutting | disconnecting at the position of an insulator has been taken (for example, patent document 1).

  In Patent Document 2, as a device for manufacturing a stacked battery using a stacking jig having a plurality of support surfaces, stacked subassemblies are supplied as a continuous subassembly unit formed in a row, There is disclosed an apparatus having a rotatable stacking jig in which a plurality of subassembly units are stacked on each of support surfaces by winding the subassembly unit continuous body.

JP 2008-053103 A JP 2009-295553 A

  Here, in the apparatus for manufacturing the conventional laminated battery, when the sub-assembly unit continuum is wound around the stacking jig over a plurality of turns due to the thickness of the sub-assembly being stacked, the sub-assembly is wound around the front periphery. In some cases, the sub assembly unit continuum is wound over the step due to the thickness of the sub assembly unit continuum, and the winding is not smoothly performed, resulting in a decrease in manufacturing efficiency.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a laminated battery manufacturing apparatus capable of improving the manufacturing efficiency.

  The present invention, which solves the problems of the above-mentioned conventional example, comprises stacking in series a single battery cell in which a positive electrode active material layer, a separator, a negative electrode active material layer, and a negative electrode current collector are sequentially stacked on a positive electrode current collector. An apparatus for manufacturing a stacked battery comprising: means for supplying a continuous cell-shaped battery cell unit cell in a row through a seal portion; and the supplied battery cell continuous object unit. A rotating body to be wound, and an outer peripheral portion of the rotating body is formed by connecting N (N is an integer of 3 or more) stages each of which stacks unit cells, and the circumferential lengths of the N stages are mutually connected. One side of the N stages, the one side perpendicular to the circumferential direction is in the radial direction by an amount corresponding to the thickness of the battery cell continuum rather than the surface of the adjacent stage. What was formed to protrude A.

  Here, the length of the seal portion of the battery cell continuum is ΔL / N for every N battery cells (where ΔL is one of the battery cell continuums wound around the rotating body). It may be formed so as to be longer by the difference in length between the previous circumference and the current circumference.

  Further, a pair of cutting members that are provided corresponding to at least one stage of the rotating body and that cut the battery cell continuum with a seal portion in a direction normal to the stage in each of the sides orthogonal to the circumferential direction of the stage. You may have a cutting blade.

  Furthermore, the stage may be formed as a curved surface that protrudes toward the outer periphery, or the stage may be formed in a curved shape that matches the shape of the laminated battery. Furthermore, you may further have a press apparatus which presses the said to-be-cut body to the said stage.

  According to the present invention, it is possible to increase the efficiency of manufacturing a stacked battery.

It is explanatory drawing which represents typically the manufacturing method of the battery which concerns on embodiment of this invention. It is explanatory drawing which showed the manufacturing method of the battery which concerns on an example of embodiment of this invention paying attention to the division of one single battery cell. It is explanatory drawing which represents typically the structure of the single battery cell which concerns on embodiment of this invention. It is explanatory drawing which showed the manufacture example of the laminated battery which concerns on an example of embodiment of this invention. It is explanatory drawing which represents typically the winding state of the single battery cell continuous body which concerns on embodiment of this invention. It is explanatory drawing which shows an example of the laminated battery manufactured by the manufacturing method of the battery which concerns on an example of embodiment of this invention. It is another explanatory drawing which represents typically the winding state of the single battery cell continuous body concerning an embodiment of the invention. It is explanatory drawing which shows another example of the laminated battery manufactured by the manufacturing method of the battery which concerns on an example of embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings. As schematically shown in FIG. 1, a laminated battery manufacturing apparatus according to an embodiment of the present invention is a strip-shaped single battery cell continuous body 20 in which single battery cells 10 are continuously formed in a row through a seal portion. Is provided, and the laminated part 2 provided with the rotating body 21 around which the supplied single battery cell continuous body 20 is wound. In the following description and drawings, the size of each part, the ratio of size, and the like are examples, and actual ones may be different.

  Here, in the supply unit 1, a strip-shaped (long sheet-shaped) first current collector sheet 11 is provided by being wound around a roll 100, and the second current collector 12 is formed in a predetermined shape. Provided cut. The shape of the second current collector 12 will be described later. In addition, in FIG. 1, in order to make a manufacturing process easy to see, it is a cross-sectional view schematically showing a cross section broken at the center in the width direction of the first current collector sheet 11.

  As the first current collector sheet 11 and the second current collector 12, any of a metal current collector and a resin current collector may be used, and a known metal current collector and JP 2012-150905 A respectively. And known resin current collectors described in International Publication No. WO2015 / 005116 and the like can be used.

  As the metal current collector, metal current collectors generally used for lithium ion batteries can be used, such as copper, aluminum, titanium, nickel, tantalum, niobium, hafnium, zirconium, zinc, tungsten, bismuth, antimony and these. Examples thereof include current collectors made of one or more metals selected from the group consisting of alloys containing one or more and stainless steel alloys.

  The shape of the base material of the metal current collector may be any of a thin plate shape, a metal foil shape, and a mesh shape, and the metal layer is formed on the surface of the base material of the metal current collector by techniques such as sputtering, electrodeposition and coating. May be formed.

  The resin current collector is a current collector formed from a conductive polymer material or a non-conductive polymer material imparted with conductivity. Examples of the conductive polymer material include polyaniline, polypyrrole, polythiophene, polyacetylene, Examples include polyparaphenylene, polyphenylene vinylene, polyacrylonitrile, and polyoxadiazole. Non-conductive polymer materials include polyethylene (PE), polypropylene (PP), polymethylpentene (PMP), polycycloolefin (PCO), polyethylene terephthalate (PET), polyethernitrile (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. It is done.

  Non-conductive polymer materials are preferably polyethylene (PE), polypropylene (PP), polymethylpentene (PMP) and polycycloolefin (PCO), more preferably polyethylene (PE), from the viewpoint of electrical stability. , Polypropylene (PP) and polymethylpentene (PMP).

  In addition, the resin current collector is for the purpose of improving the conductivity of the resin current collector containing the conductive polymer material, or for the purpose of imparting conductivity to the resin current collector containing the non-conductive polymer material. It is preferable that a conductive filler is included. The conductive filler is selected from materials having conductivity, and preferably a material having no conductivity with respect to ions used as a charge transfer medium from the viewpoint of suppressing ion permeation in the current collector. Specific examples of such a material include carbon materials, alloy materials such as aluminum, gold, silver, copper, iron, platinum, chromium, tin, indium, antimony, titanium, nickel, and stainless steel (SUS). However, it is not limited to these. As these conductive fillers, one kind of material may be used alone, or two or more kinds of materials may be used in combination. From the viewpoint of corrosion resistance, the conductive filler is preferably aluminum, stainless steel, a carbon material, or nickel, and more preferably a carbon material. In addition, these conductive fillers may be those obtained by coating the metal shown above with a plating or the like around a particulate ceramic material or resin material.

  The resin current collector can be obtained by a known method described in JP 2012-150905 A and International Publication No. WO 2015/005116, and specific examples include 5 to 5 acetylene black as a conductive filler in polypropylene. Examples thereof include 20 parts dispersed and then rolled with a hot press. Moreover, the thickness is not particularly limited, and can be applied in the same manner as known ones or with appropriate changes.

  In the battery manufacturing method according to the embodiment of the present invention, the positive electrode active material 13 and the negative electrode active material 14 are prepared in advance. Among them, the positive electrode active material 13 is a powdery positive electrode active material particle or a slurry or gel material obtained by dispersing the positive electrode active material particle in an electrolytic solution.

Here, as the positive electrode active material particles, composite oxides of lithium and transition metals (for example, LiCoO ₂ , LiNiO ₂ , LiMnO ₂ and LiMn ₂ O ₄ ), transition metal oxides (for example, MnO ₂ and V ₂ O ₅ ), Transition metal sulfides (eg MoS ₂ and TiS ₂ ) and conductive polymers (eg polyaniline, polyvinylidene fluoride, polypyrrole, polythiophene, polyacetylene, poly-p-phenylene and polycarbazole).

The negative electrode active material 14 is powdery negative electrode active material particles or a slurry or gel material obtained by dispersing the negative electrode active material particles in an electrolyte solution. Here, as the negative electrode active material particles, graphite, non-graphitizable carbon, amorphous carbon, polymer compound fired bodies (for example, those obtained by firing and carbonizing phenol resin, furan resin, etc.), cokes (for example, pitch coke, Needle coke and petroleum coke), carbon fibers, conductive polymers (eg polyacetylene and polypyrrole), tin, silicone, and metal alloys (eg lithium-tin alloys, lithium-silicon alloys, lithium-aluminum alloys and lithium-aluminum) -Manganese alloys, etc.), complex oxides of lithium and transition metals (for example, Li ₄ Ti ₅ O _12, etc.).

  In the present embodiment, the positive electrode active material particles or the negative electrode active material particles are preferably coated active material particles in which at least a part of the surface thereof is coated with a coating agent containing a coating resin and a conductive additive. .

  In this example, the coating agent includes a coating resin. When the periphery of the positive electrode active material particles is coated with the coating agent, the volume change of the electrode is alleviated and the expansion of the electrode can be suppressed. Examples of the coating resin include vinyl resin, urethane resin, polyester resin, polyamide resin, epoxy resin, polyimide resin, silicone resin, phenol resin, melamine resin, urea resin, aniline resin, ionomer resin, polycarbonate, and the like. Among these, vinyl resin, urethane resin, polyester resin or polyamide resin is preferable.

  Moreover, as a conductive support agent, it selects from the material which has electroconductivity. Specifically, metallic materials such as aluminum, stainless steel (SUS), silver, gold, copper and titanium, carbon such as graphite, carbon black (acetylene black, ketjen black, furnace black, channel black, thermal lamp black, etc.) Examples include, but are not limited to, materials, and mixtures thereof.

  Moreover, when using a metal material as a conductive support agent, the alloy or oxide (metal oxide) may be used. From the viewpoint of electrical stability, the material used as a conductive additive is preferably a metal such as aluminum, stainless steel, silver, gold, copper, titanium, carbon, silver, gold, copper, titanium, graphite, carbon black (acetylene black) , Ketjen black, furnace black, channel black, thermal lamp black, etc.), carbon nanotubes (single-walled carbon nanotubes, multi-walled carbon nanotubes, etc.) and mixtures thereof, more preferably silver, gold, aluminum, stainless steel and carbon Yes, more preferably carbon. These conductive assistants may be those obtained by coating a particulate ceramic material or resin material with a conductive material (metal among the conductive auxiliary materials described above) by plating or the like. Here, one kind of conductive assistant may be used alone, or two or more kinds of conductive assistant may be used in combination.

  Furthermore, it is also possible to use conductive fibers as a conductive auxiliary. Examples of conductive fibers include carbon fibers such as PAN-based carbon fibers and pitch-based carbon fibers, conductive fibers obtained by uniformly dispersing highly conductive metal and graphite in synthetic fibers, and metals such as stainless steel. Metal fibers, conductive fibers whose surfaces are coated with metal, conductive fibers whose surfaces are coated with a resin containing a conductive substance, and the like. Among these conductive fibers, carbon fibers are preferable.

  The coated active material particles are, for example, dropped into and mixed with a resin solution containing a coating resin over a period of 1 to 90 minutes in a state where the active material particles are put in a universal mixer and stirred at 30 to 500 rpm. It can be obtained by mixing, raising the temperature to 50 to 200 ° C. with stirring, reducing the pressure to 0.007 to 0.04 MPa, and holding for 10 to 150 minutes.

  Further, when the positive electrode active material particles or the negative electrode active material particles are dispersed in the electrolytic solution to form the slurry-like or gel-like positive electrode active material 13 or the negative electrode active material 14, the electrolytic solution is used for manufacturing a lithium ion battery. An electrolyte solution containing an electrolyte and a non-aqueous solvent can be used.

The specific _{electrolyte, LiPF 6, LiBF 4, LiSbF} 6, LiAsF 6 , and lithium salts of inorganic acids LiClO _{4, etc., LiN (CF 3 SO 2)} 2, LiN (C 2 F 5 SO 2) 2 and LiC There are lithium salts of organic acids such as (CF ₃ SO ₂ ) ₃ . Among these, LiPF ₆ is preferable from the viewpoint of battery output and charge / discharge cycle characteristics.

  In addition, as the non-aqueous solvent, those used in ordinary electrolytic solutions can be used, for example, lactone compounds, cyclic or chain carbonates, chain carboxylates, cyclic or chain ethers, phosphates, Nitrile compounds, amide compounds, sulfones, sulfolanes and the like and mixtures thereof can be used. This non-aqueous solvent may be used alone or in combination of two or more non-aqueous solvents.

  Of the above non-aqueous solvents, preferred from the viewpoints of battery output and charge / discharge cycle characteristics are lactone compounds, cyclic carbonates, chain carbonates and phosphate esters, and more preferred are lactone compounds, cyclic esters. A carbonate ester and a chain carbonate ester are more preferable, and a mixed solution of a cyclic carbonate ester and a chain carbonate ester is more preferable. Particularly preferred is propylene carbonate (PC) or a mixture of ethylene carbonate (EC) and diethyl carbonate (DEC).

  Moreover, when making it into a slurry form, it is preferable to prepare by dispersing active material particle and a conductive support agent at the density | concentration of 10 to 60 weight% based on the weight of electrolyte solution, and making it a slurry.

  Furthermore, in the present embodiment, a separator 15 cut into a predetermined shape is prepared. The separator 15 is made of polyethylene, polypropylene or the like, a microporous film made of polyolefin, a multilayer film of porous polyethylene film and polypropylene, a nonwoven fabric made of polyester fiber, aramid fiber, glass fiber, etc., and silica on the surface thereof, It is composed of a material to which ceramic fine particles such as alumina and titania are attached. The shape of the separator 15 will be described later.

  Further, the first current collector 110 (the first current collector sheet 11 is cut), the positive electrode active material 13, the separator 15, the negative electrode active material 14, and the second current collector 12 that are adjacent to each other are provided. A sealing material for forming the bank-like frame 16 that partitions the battery cells 10 is prepared. The sealing material has adhesiveness to the first and second current collectors 11 and 12, has durability against the electrolyte solution that can be contained in the positive electrode active material 13 or the negative electrode active material 14, and The material is not particularly limited as long as it is a stretchable material, but a polymer material, particularly a thermosetting resin is preferable. Specifically, an epoxy resin, a polyolefin resin, a polyurethane resin, a polyvinylidene fluoride resin, or the like may be used. Of these, epoxy resins are preferred in view of their high durability and easy handling.

  With the above preparation, the battery cell continuum 20 supplied by the supply unit 1 is manufactured by the following steps.

  That is, a belt-like (long sheet-like) first current collector sheet 11 (whose width is W) wound around the roll 100 is placed on a support member (not shown) in a predetermined transport direction (for example, the longitudinal direction). ) And supply continuously. A length d / 2 and a height h are provided in the longitudinal direction of the first current collector sheet 11 with a gap of a predetermined interval L on the continuously supplied first current collector sheet 11. The frame lower layer portion 16a that demarcates a space having a predetermined shape is repeatedly formed (frame lower layer portion arranging step: S11). Moreover, the frame lower layer part 16a is continuously formed in the range of width w (w <W / 2) from the width direction both ends of the 1st electrical power collector sheet | seat 11, respectively. Therefore, it is necessary to distinguish from the sides extending in the width direction of the first current collector sheet 11 of the frame lower layer portions 16a adjacent to each other (hereinafter referred to as the sides formed along the longitudinal direction of the first current collector sheet 11). Is called a partition side) in the longitudinal direction of the first current collector sheet 11 and is formed with a width of d / 2 + d / 2 = d. Here, the sealing material is heated and melted in a gel state, and dropped on the first current collector sheet 11 at the first position P1 in FIG. 1 to form the frame lower layer portion 16a. . That is, in this example, the shape of the frame 16 is rectangular. A catch 16c for receiving the separator 15 may be formed on the inner peripheral side (side filled with the active material) of the frame lower layer portion 16a.

  Next, at the second position P2, the width W-2w × the length L × the height formed by the pair of frame lower layer portions 16a in the length direction and the pair of frame lower layer portions 16a arranged in the width direction. One of the positive electrode active material 13 and the negative electrode active material 14 is dropped into a rectangular space (inside the frame) and filled to at least the height h of the frame lower layer portion 16a (first filling step: S12). In the drawings, the positive electrode active material 13 is filled here. Further, after this filling, the positive electrode active material 13 or the negative electrode active material 14 is uniformly dispersed in the range of the interval L between the pair of frame lower layers 16a by applying vibration and impact to the first current collector sheet 11. You may let them. Thereby, one of the positive electrode chamber or the negative electrode chamber is formed.

  In the present embodiment, the sheet-like separator 15 is cut in advance into a rectangle having a width sw × a length sd. Here, sw is W−2w <sw ≦ W (W is the width of the first current collector sheet 11), and L <sd <L + d / 2. In the present embodiment, after filling either the positive electrode active material 13 or the negative electrode active material 14 between the frame lower layer portions 16a, the separator 15 is disposed so as to cover the filled active material, and from above. Press (separator arrangement step: S13). At this time, the width direction of the separator 15 (the direction having the width sw) is aligned with the width direction of the first current collector sheet 11, and the length direction of the separator 15 is aligned with the longitudinal direction of the first current collector sheet 11. . Further, both end portions of the separator 15 in the longitudinal direction of the first current collector sheet 11 do not overlap the outer periphery of each frame lower layer portion 16a (the width of the overlapping portion between the frame body 16 and the separator 15 is The separator 15 is positioned so that the width of the side of the frame 16 is less than d / 2. Here, the outer periphery of the frame lower layer portion 16 a coincides with the outer periphery of the first current collector sheet 11 in the width direction of the first current collector sheet 11, and in the longitudinal direction of the first current collector sheet 11. Is the outer periphery of the d / 2 width partition side illustrated in FIG. 2 (since the partition side is continuous with the partition side of the adjacent frame lower layer portion 16a, this outer periphery is adjacent to the outer periphery of the adjacent frame lower layer portion 16a. Match). The separator 15 is disposed so as not to overlap at least the outer periphery of the partition side. Therefore, the pair of separators 15 disposed in the frame lower layer portions 16a adjacent to each other are also disposed so as not to overlap. Thereby, a portion (gap) where the separator 15 does not exist is formed in the longitudinal direction of the first current collector sheet 11.

  Next, a frame upper layer portion 16b having a height h 'is further arranged on the portion where the frame lower layer portion 16a is formed to form the frame body 16 (frame body forming step: S14). This frame upper layer portion 16b is also formed by heating the sealing material to melt it in a gel state and dropping it in substantially the same shape on the frame lower layer portion 16a at the third position P3 in FIG. it can. At this time, both end portions of the separator 15 in the longitudinal direction of the first current collector sheet 11 are sandwiched between the frame lower layer portion 16 a and the frame upper layer portion 16 b and are sealed by the frame body 16. The Further, a catch 16c for receiving the second current collector 12 may be formed on the inner peripheral side (side filled with the active material) of the frame upper layer portion 16b.

  After this frame forming step, in the space defined by the pair of frame upper layer portions 16b and the separator 15 (the space having the length L in the longitudinal direction of the first current collector sheet 11), the positive electrode active material 13 or the other of the negative electrode active material 14 is filled (second filling step: S15). That is, if the positive electrode active material 13 is filled in step S12, the negative electrode active material 14 is filled here. If the negative electrode active material 14 is filled in step S12, the positive electrode active material 13 is filled here. In the drawing, the negative electrode active material 14 is illustrated as being filled here.

  Also in the filling of the active material here, the active material is dropped and filled to at least the height h ′ of the frame upper layer portion 16b at the fourth position P4 in FIG. In this case as well, after the filling, the first current collector sheet 11 is vibrated and shocked, so that the negative electrode active material 14 or the positive electrode active material 13 is uniformly distributed within the range L between the pair of frame lower layers 16a. It may be dispersed. Thereby, a negative electrode chamber or a positive electrode chamber is formed.

  Further, here, the sheet-like second current collector 12 is cut in advance into a rectangle of width tw × length td. Here, tw is W−2w <tw ≦ W (W is the width of the first current collector sheet 11, w is the width of the frame lower layer portion 16 a disposed at both ends in the width direction of the first current collector sheet 11. ), Preferably tw = W, and L <td <L + d / 2.

  In the present embodiment, the space formed by the frame upper layer portion 16b and the separator 15 is filled with the other of the positive electrode active material 13 or the negative electrode active material 14, and then the second active material is covered so as to cover the filled active material. Current collector 12 is arranged (current collector arrangement step: S16). At this time, the width direction of the second current collector 12 (the direction having the width tw) is aligned with the width direction of the first current collector sheet 11, and the length direction of the second current collector 12 is the first current collector. Align with the longitudinal direction of the body sheet 11. In addition, the second current collector 12 is arranged such that both ends of the second current collector 12 in the longitudinal direction of the first current collector sheet 11 do not overlap the outer circumference in the length direction of the frame 16. That is, the second current collector 12 and the outer periphery of the side (partition side) formed in the width direction of the first current collector sheet 11 of the frame 16 are not overlapped with the second current collector 12. The width of the overlapping portion with the partition side of the frame body 16 is less than the width d / 2 of the partition side of the frame body 16. As described above, the second current collector 12 is also arranged so as not to overlap at least the outer periphery of the partition side of the frame body 16, and therefore, the pair of second current collectors 12 disposed on the frame bodies 16 adjacent to each other is also included. It will be arranged not to overlap each other. Thereby, a portion (gap) where the second current collector 12 does not exist is formed in the longitudinal direction of the first current collector sheet 11.

  Further, in this current collector arranging step, the second current collector 12 is pressed against the frame body 16 by being pressed while heating the second current collector 12, and is fixed to the frame body 16. The upper surface side of the two current collectors 12 may be substantially flush.

  Accordingly, as illustrated in FIG. 3, a single unit having at least the positive electrode active material 13, the separator 15, the negative electrode active material 14, and the second current collector 12 on the continuous first current collector sheet 11. The battery cells 10 are partitioned by a frame body 16 (more specifically, a partitioning side of the frame body 16) serving as a seal portion arranged at a predetermined interval, whereby a single battery cell continuous body 20 is formed. In FIG. 3, in order to represent the inside of the single battery cell 10, a part of the second current collector 12 is opened and the single battery cell 10 is broken.

  In the present embodiment, after the frame body 16 is formed in step S14, the upper surface side (the surface on which cutting is started later) of the frame body 16 is performed so far. At the outer peripheral position of the partition sides (the partition sides of the frame bodies 16 adjacent to each other are formed continuously, so that they are at positions of distance d / 2 from both ends in the length direction), that is, in the longitudinal direction. For each distance of L + d, a groove 160 having a predetermined shape such as a V-shaped or U-shaped cross section is formed. FIG. 1 shows an example in which the groove 160 is formed immediately after step S14. The groove 160 may be formed by pressing or cutting, or may be formed by dropping the material of the frame body, which is a seal material, in such a shape in step S14.

  The supply unit 1 supplies the single battery cell continuum 20 thus obtained to the stacked unit 2.

  The stacked unit 2 includes a rotating body 21. Here, the outer peripheral part of the rotating body 21 has a winding part that connects N (N is an integer of 3 or more) stages 210a, 210b,.

  Here, the circumferential lengths of the stages 210a, 210b,... 210N are the same (L + d), and one of the N stages 210a, 210b,. The one side (210N-E) orthogonal to the circumferential direction is formed so as to protrude in the radial direction by an amount corresponding to the thickness of the single battery cell continuous body 20 from the surface of the adjacent stage 210 (N-1). ing.

  Here, each stage has a length of L + d in the circumferential direction, and has a width W of the first current collector sheet 11 or more in the width direction orthogonal to the circumferential direction.

  Further, in this rotating body 21, for any one of these stages 210 (stage 210N in the figure), one end 210N-E in the circumferential direction is more than the surface of the adjacent stage 210 (N-1). The battery cell continuum 20 is formed so as to protrude in the radial direction by an amount corresponding to the thickness H of the battery cell continuum 20. Hereinafter, this stage 210N is referred to as a step stage.

  The stacking unit 2 rotates the rotating body 21 while the unit cell 10 included in the unit cell continuous body 20 supplied from the supply unit 1 is moved to the stage 210a (the rotating unit 21 is rotated clockwise) after the stepped stage. When rotating, the next stage is wound around the stage 210 in order from the next stage in the counterclockwise direction, and when the rotating body 21 is rotating counterclockwise, the next stage is turned from the next stage in the clockwise direction from the stepped stage.

  At this time, the air between the front surface of the stage 210 and the back surface side of the unit cell 10 may be pressed from the outside by a pressing device such as the roller 211. As shown in detail in FIG. 5, the pressing device in the example of FIG. 1 is rotatably supported on one end side of a rod-like support 213 in which a roller 211 is rotatably arranged with a fulcrum 212 as a rotation axis. The end of the support 213 opposite to the roller 211 is fixed to a wall surface or the like via an elastic body such as a spring. As a result, a force that urges the roller 211 in the direction of the stage surface of the rotating body 21 acts, and the single battery cell 10 is pressed to be in close contact with the stage 210.

  When the single battery cell 10 is wound in order from the stage 210a of the rotating body 21 and the single battery cell 10 is wound around the stage 210N which is a stepped stage (at this time, the single battery cell is placed at the corner of the rotating body 21). The seal portion of the continuum 20 is located and the V-shaped groove is split open), and the position of the bottom surface of the unit cell 10 on the one end 210N-E side in the circumferential direction of the step stage 210N is first The position corresponds to the height of the single battery cell 10 wound around the stage 210a (the length from the rotation center of the rotating body 21 is the same).

  Accordingly, the single battery cell 10 to be supplied next is stacked on the single battery cell 10 wound around the stage 210a on the previous circumference without difficulty.

  As described above, in the present embodiment, one end in the circumferential direction (the end opposite to the winding direction R) of the stage 210 of the rotating body 21 is more than the surface of the adjacent stage. Since it is formed so as to protrude in the radial direction by an amount corresponding to the height of the battery cell continuum 20, a step corresponding to the height of the single battery cell continuum 20 wound around the front circumference is overcome for each circumference. This eliminates the need for smooth winding.

  In addition, the length of the battery cell continuous body 20 per rotation of the rotating body 21 increases as the number of stacking times (the number m when the battery cell continuous body 20 is wound around the rotating body 21 by m turns) increases. However, when the thickness H of the battery cell continuum 20 is sufficiently larger than the diameter of the rotating body 21 or when the number of laminations is small, this length is small enough to be ignored.

  But when this length cannot be disregarded, when the supply part 1 forms the single battery cell continuous body 20, the length of the seal part between a pair of adjacent single battery cells 10 is the number of the single battery cells 10. ΔL / N (where ΔL is one cell cell continuous body 20 wound around the rotating body 21) every N pieces (a set of the single battery cells 10 arranged on the stage 210N to the stage 210N). It may be formed so as to be longer by the difference in length between the circumference and the current circumference.

  After the battery cell continuum 20 is wound around the rotator 21 by a desired number of turns and stacked, the battery cell continuum 20 is removed from the rotator 21. Thus, a cylindrical battery in which the single battery cells 10 are stacked is obtained.

  Further, in the present embodiment, corresponding to at least one stage 210 of the rotator 21, the single battery cell continuum 20 in the normal direction of the stage 210 in each of the sides orthogonal to the circumferential direction of the stage 210. You may provide a pair of cutting blade which cut | disconnects by a seal part.

  After the battery cell continuum 20 is wound around the rotating body 21 in a desired number of turns and stacked, the pair of the battery cell continuums 20 is positioned at the positions illustrated in FIG. 4A (both ends E of the battery cell 10). When the cutting blade is driven, the battery cell continuum 20 is cut at the position of the V-shaped groove 160, and the battery cells 10 are stacked by the number of stacks corresponding to the number of windings, as illustrated in FIG. N such stacked batteries are obtained.

  Further, as illustrated in FIG. 5, each stage 210 of the rotating body 21 may be formed as a curved surface that protrudes toward the outer periphery. Furthermore, as shown in FIG. 7, the stage 210 may be formed in a curved surface shape that matches the desired shape of the laminated battery. In the case of forming a curved surface in this way, a pressing device is provided in accordance with the shape of the curved surface (for example, the number of inflection points or more) so that the battery cell continuum 20 adheres along the curved surface of the stage 210. You may make it press on. According to this example, N stacked batteries bent into the shape of the stage 210 as illustrated in FIG. 8 are obtained.

  In the present embodiment, the second current collector 12 and the separator 15 are not present at the time of cutting because the second current collector 12 and the separator 15 are not present in the seal portion (the outer peripheral portion of the frame 16) that is the cutting position. Will not be bent and short-circuited to the first current collector 11.

  Furthermore, in this embodiment, as illustrated in FIG. 4B, each stage 210 of the rotator 21 is ruptured from the stacked single battery cells 10, and then, by an actuator mechanism provided inside the rotator 21, When instructed from outside, the rotating body 21 may be configured to rise in the radial direction.

  DESCRIPTION OF SYMBOLS 1 Supply part, 2 Stacking part, 10 Single battery cell, 11 1st electrical power collector sheet, 12 2nd electrical power collector, 13 Positive electrode active material, 14 Negative electrode active material, 15 Separator, 16 Frame, 16a Frame Lower layer part, 16b Upper layer part of frame body, 20 cell unit continuous body, 21 rotating body, 100 roll, 110 first current collector, 160 groove, 210 stage, 211 roller, 212 fulcrum, 213 support.

Claims (6)

An apparatus for producing a stacked battery in which unit cells formed by sequentially stacking a positive electrode active material layer, a separator, a negative electrode active material layer, and a negative electrode current collector on a positive electrode current collector,
Means for supplying a continuous cell-shaped battery cell unit in a row through the seal portion, the unit cell;
A rotating body for winding the supplied single battery cell continuum;
The outer periphery of the rotating body is formed by connecting N (N is an integer of 3 or more) stages each of which stacks single battery cells.
The circumferential lengths of the N stages are the same as each other,
One side perpendicular to the circumferential direction of any one of the N stages protrudes in the radial direction by an amount corresponding to the thickness of the battery cell continuous body from the surface of the adjacent stage. An apparatus for manufacturing a stacked battery that is formed.   The length of the seal portion of the battery cell continuum is ΔL / N for every N battery cells (where ΔL is the previous battery cell continuum wound around the rotating body). The apparatus for manufacturing a stacked battery according to claim 1, wherein the apparatus is formed to be longer by a difference in length between a circumference and a current circumference.   A pair of cutting members that are provided corresponding to at least one stage of the rotating body and that cut the unit cell cell continuous body at a seal portion in a direction normal to the stage in each of the sides orthogonal to the circumferential direction of the stage. The manufacturing apparatus of the laminated battery of Claim 1 or 2 which has a cutting blade.   The said stage is a manufacturing apparatus of the laminated battery as described in any one of Claim 1 to 3 formed as a curved surface which becomes convex toward outer periphery.   The said stage is a manufacturing apparatus of the laminated battery as described in any one of Claim 1 to 3 formed in the curved surface shape match | combined with the shape of the laminated battery. The manufacturing apparatus of the laminated battery as described in any one of Claim 1 to 5 which further has a press apparatus which presses the said single battery cell to the said stage.

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