JP2012113974A - Battery manufacturing method, battery, vehicle, and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method capable of manufacturing a battery having superior cell reaction efficiency with high productivity and apparatuses incorporating the battery.SOLUTION: A cathode current collector is coated with a coating liquid containing a cathode active material to form a cathode active material layer, on top of which a coating liquid containing a solid electrolyte material is applied to form a solid electrolyte layer, further on top of which a coating liquid containing an anode active material is applied to form an anode active material layer, in which way a lithium ion secondary battery is manufactured. As for the cathode active material layer, a coating liquid containing a cathode active material is successively ejected from a plurality of discharge ports 44 of a discharge head 40, and a relative movement in the X direction and a relative movement in the Y direction of the discharge head 40 are alternately carried out a number of times, whereby a cathode active material layer having square lattice-like convex patterns on the surface of the cathode current collector is formed. Thus, by increasing the contact area between the active material layer and the solid electrolyte layer, it is possible to achieve superior cell reaction efficiency.

Description

  The present invention relates to a method for manufacturing a battery such as a lithium ion secondary battery in which an electrolyte layer is interposed between active material layers, a battery manufactured by the manufacturing method, and a device on which the battery is mounted.

  Conventionally, as a method of manufacturing a chemical battery such as a lithium ion battery, a metal foil as a current collector and a positive electrode active material and a negative electrode active material, which are attached to each other, are overlapped via a separator such as a nonwoven fabric. A technique for impregnating a separator with an electrolytic solution is known. However, since batteries that contain highly volatile organic solvents as electrolytes need to be handled with care, and further downsizing and higher output are required, in recent years solid electrolytes have been used instead of electrolytes. Techniques to use have been proposed.

  For example, Patent Document 1 discloses a battery in which a positive electrode active material layer, a solid polymer electrolyte layer, and a negative electrode active material layer are laminated by an inkjet method, and the laminate is sandwiched between current collectors. A technique is disclosed in which the contact surface between the solid polymer electrolyte layer and the contact surface between the negative electrode active material layer and the solid polymer electrolyte layer is uneven.

JP-A-2005-116248

  In the technique described in Patent Document 1, an ink jet method is used to form a complex uneven-shaped positive electrode active material layer, negative electrode active material layer, and solid polymer electrolyte layer. And by making the contact surface of an active material layer and a solid electrolyte layer uneven, the contact area is increased, the efficiency of the battery reaction is improved, and the output of the battery is improved.

  However, the technique described in Patent Document 1 has the following problems. First of all, in the inkjet method, since a small amount of ink is ejected, a complicated structure can be formed with good controllability, but in order to obtain a desired three-dimensional structure, many times of overcoating are required. For this reason, there are problems that the number of processes increases, a long time is required for production, and productivity is low. Secondly, inks containing different materials (positive ink, negative ink, electrolyte ink) are mixed by contact with each other, and the boundary between the active material layer and the solid electrolyte layer becomes unclear, resulting in performance as a battery. It may be reduced. In the technique described in Patent Document 1, drying is performed every time a predetermined pattern is printed, but in this case, productivity is further reduced and mixing between layers formed in each printing process is performed. However, it is not possible to prevent mixing between adjacent layers formed in a single printing process.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a battery having good battery reaction efficiency, a manufacturing method capable of manufacturing the battery with high productivity, and a device including the battery. And

  In order to solve the above-mentioned problem, the invention according to claim 1 is the battery manufacturing method, wherein the first current collector is linearly formed on the surface of the first current collector along at least the first direction and the second direction different from the first direction. A first active material layer forming step of applying a coating liquid containing one active material to form a first active material layer having a predetermined convex pattern; and a first current collector on which the first active material layer is formed. Applying a coating solution containing a solid electrolyte material on the surface to form an electrolyte layer having irregularities following the convex pattern of the first active material layer; and forming a second active material on the surface of the electrolyte layer And a second active material layer forming step of forming a second active material layer that fills the concave portion of the electrolyte layer and covers the convex portion of the electrolyte layer.

  According to a second aspect of the present invention, in the battery manufacturing method according to the first aspect of the present invention, the method further comprises a step of laminating a second current collector on the surface of the second active material layer.

  According to a third aspect of the present invention, in the battery manufacturing method according to the first or second aspect of the present invention, the first active material layer forming step starts from a plurality of discharge ports arranged in a line on the discharge head. While discharging the coating liquid containing one active material, the discharge head is moved relative to the first current collector to thereby apply a plurality of coating liquids containing the first active material on the surface of the first current collector. It is characterized in that it is applied in the form.

  According to a fourth aspect of the present invention, in the battery manufacturing method according to the third aspect of the present invention, the first direction and the second direction are orthogonal to each other, and the plurality of discharge ports are arranged along the second direction. In the first active material layer forming step, the relative movement in the first direction and the relative movement in the second direction of the first current collector are alternately and repeatedly performed in the first active material layer forming step. Thus, a first active material layer having a lattice-like convex pattern is formed on the surface of the first current collector.

  According to a fifth aspect of the present invention, in the battery manufacturing method according to the fourth aspect of the present invention, one relative movement amount of the ejection head in the first direction and one relative movement in the second direction. The first active material layer having a square lattice-like convex pattern is formed on the surface of the first current collector by equalizing the amount.

  According to a sixth aspect of the present invention, in the battery manufacturing method, the first active material is linearly provided on the surface of the first current collector along at least the first direction and the second direction different from the first direction. A first active material layer forming step of forming a first active material layer having a predetermined convex pattern by applying a coating solution containing the same, and applying a coating solution containing the second active material on the surface of the second current collector And a second active material layer forming step of forming a second active material layer, and an electrolyte layer forming step of sandwiching the electrolyte layer between the first active material layer and the second active material layer. .

  The invention of claim 7 is a battery, and is manufactured by the method for manufacturing a battery according to any one of claims 1 to 6.

  The invention according to claim 8 is a vehicle, and is equipped with a battery according to the invention of claim 7.

  A ninth aspect of the invention is an electronic device, comprising the battery according to the seventh aspect of the invention and a circuit unit that operates using the battery as a power source.

  According to the first to fifth aspects of the present invention, the coating liquid containing the first active material is applied to the surface of the first current collector in a linear manner along at least the first direction and the second direction. A first active material layer having a convex pattern is formed, and a coating solution containing a solid electrolyte material is applied thereto to form an electrolyte layer having irregularities following the convex pattern of the first active material layer, and further on the surface In order to form a second active material layer that fills the concave portions of the electrolyte layer by applying a coating liquid containing the second active material and covers the convex portions of the electrolyte layer, the first active material layer and the electrolyte layer The contact area can be increased to improve the battery reaction efficiency. Further, since the coating liquids are sequentially stacked, the number of steps is small, and the battery can be manufactured with high productivity.

  In particular, according to the invention of claim 3, the discharge head is discharged from the plurality of discharge ports arranged in a row on the discharge head while the discharge liquid containing the first active material is discharged to the first current collector. By performing the relative movement, the coating liquid containing the first active material is applied to the surface of the first current collector in a plurality of lines, so that the time required for forming the first active material layer can be significantly shortened. .

  In particular, according to the invention of claim 4, in order to form the first active material layer having a grid-like convex pattern on the surface of the first current collector, the first and second active material layers are in contact with the electrolyte layer. The area can be effectively increased to improve the battery reaction efficiency.

  In particular, according to the invention of claim 5, in order to form the first active material layer having a square lattice-like convex pattern on the surface of the first current collector, the first and second active material layers and the electrolyte layer The output density can be made uniform by making the unevenness distribution on the contact surface uniform.

  According to the invention of claim 6, the predetermined convex pattern is formed by applying the coating liquid containing the first active material in a linear manner along at least the first direction and the second direction on the surface of the first current collector. A first active material layer is formed, and a second active material layer is formed by applying a coating liquid containing the second active material to the surface of the second current collector, and the first active material layer and the second active material layer are formed. Since the electrolyte layer is sandwiched between the material layer, the contact area between the first and second active material layers and the electrolyte layer can be increased, and the efficiency of the battery reaction can be improved. Further, the number of steps required for production is small, and the battery can be produced with high productivity.

  According to the invention of claim 7, since the battery is manufactured by the battery manufacturing method according to any one of claims 1 to 6, the efficiency of the battery reaction can be improved.

  According to the invention of claim 8, the battery according to the invention of claim 7 can be suitably used as a power source for driving the vehicle.

  According to the invention of claim 9, the battery according to the invention of claim 7 can be suitably used as the power source of the circuit portion of the electronic device.

It is an external appearance perspective view of the lithium ion secondary battery manufactured by the manufacturing method of the battery which concerns on this invention. It is sectional drawing of the lithium ion secondary battery of FIG. It is a perspective view which shows the structure at the time of forming a negative electrode active material layer on the upper surface of a negative electrode current collector. It is a flowchart which shows the manufacture procedure of a lithium ion secondary battery. It is a figure which shows the structure of the coating unit used for the nozzle scanning method. It is sectional drawing which shows the internal structure of a discharge head. It is a flowchart which shows the procedure of the application | coating operation | movement by an application | coating unit. It is a figure which shows the locus | trajectory of the several discharge outlet which moves relatively with respect to a negative electrode electrical power collector. It is a figure which shows the pattern of the negative electrode active material layer formed in the surface of a negative electrode collector. It is a figure which shows schematic structure of the rotary coating unit used for a spin coat method. It is a top view of the laminated body at the time of forming a solid electrolyte layer. It is a longitudinal cross-sectional view of the laminated body of FIG. It is a figure which shows typically a mode that the coating liquid of a positive electrode active material is apply | coated by a knife coat method. It is a figure which shows typically the electric vehicle carrying the lithium ion secondary battery which concerns on this invention. It is a figure which shows typically the IC card carrying the lithium ion secondary battery which concerns on this invention. It is a figure which shows the other example of the locus | trajectory of the several discharge outlet which moves relatively with respect to a negative electrode electrical power collector. It is a figure which shows the other example of the locus | trajectory of the several discharge outlet which moves relatively with respect to a negative electrode electrical power collector. It is a figure which shows the other example of the application pattern to a negative electrode collector.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<1. Lithium-ion battery structure>
FIG. 1 is an external perspective view of a lithium ion secondary battery 1 manufactured by the battery manufacturing method according to the present invention. FIG. 2 is a cross-sectional view of the lithium ion secondary battery 1 of FIG. A lithium ion secondary battery is a secondary battery (storage battery) in which lithium ions are responsible for electrical conduction, has a high energy density, a small memory effect, and a low deterioration due to repeated charge and discharge. Have. The lithium ion secondary battery 1 has a structure in which a negative electrode active material layer 12, a solid electrolyte layer 13, a positive electrode active material layer 14, and a positive electrode current collector 15 are sequentially laminated on a negative electrode current collector 11.

As a material constituting each layer of FIGS. 1 and 2, a known material can be adopted as a constituent material of the lithium ion secondary battery. The negative electrode current collector 11 and the positive electrode current collector 15 are metal foils, and foils of conductive materials such as copper foil, aluminum foil, and stainless steel foil can be used. In the present embodiment, a copper foil is used as the negative electrode current collector 11 and an aluminum foil is used as the positive electrode current collector 15. As the negative electrode active material constituting the negative electrode active material layer 12, it is possible to use, for example, a mixture of lithium titanate and (Li ₄ Ti ₅ O ₁₂₎ and graphite, constituting the positive electrode active material layer 14 positive As the active material, for example, lithium cobalt oxide (LiCoO ₂ ), lithium manganese oxide (LiMn ₂ O ₄ ), and a mixture thereof can be used. Further, as the solid electrolyte layer 13, for example, a borate ester polymer electrolyte can be used. Of course, the material constituting each functional layer is not limited to these.

  FIG. 3 is a perspective view showing the structure when the negative electrode active material layer 12 is formed on the upper surface of the negative electrode current collector 11. As shown in the figure, a negative electrode active material layer 12 having a grid-like convex pattern is formed on the surface of the negative electrode current collector 11. In particular, in the present embodiment, the negative electrode active material layer 12 has a square lattice-like convex pattern. That is, the lattice spacing in the vertical axis direction and the lattice spacing in the horizontal axis direction of the negative electrode active material layer 12 are equal, and the interaxial angle between the vertical axis direction and the horizontal axis direction is 90 °. The convex pattern of the negative electrode active material layer 12 will be further described later.

  As shown in FIG. 2, the solid electrolyte layer 13 is a continuous thin film formed of a solid electrolyte and having a substantially constant thickness. As shown in FIG. 3, the solid electrolyte layer 13 is formed so that the entire upper surface of the laminate is uniformly distributed so as to follow the irregularities on the surface of the laminate in which the anode active material layer 12 is formed on the surface of the anode current collector 11. Covering. Further, the positive electrode active material layer 14 has a concave-convex structure on the lower surface side so as to fill the concave portion of the solid electrolyte layer 13 and cover the convex portion. The upper surface of the positive electrode active material layer 14 is substantially flat. Then, the positive electrode current collector 15 is laminated on the upper surface of the substantially positive electrode active material layer 14 to form the lithium ion secondary battery 1. Such a lithium ion secondary battery 1 with appropriate connection terminals (tabs) attached is accommodated in a casing to form a secondary battery as a final product.

<2. Manufacturing method of lithium ion battery>
Next, a method for manufacturing the lithium ion secondary battery 1 having the above configuration will be described. FIG. 4 is a flowchart showing a manufacturing procedure of the lithium ion secondary battery. First, a metal foil (copper foil in the present embodiment) to be the negative electrode current collector 11 is prepared (step S1). Since a thin copper foil is difficult to transport and handle, the transportability may be enhanced by, for example, attaching one side to a carrier such as a glass plate.

Subsequently, a negative electrode active material layer 12 having a grid-like convex pattern is formed on the surface of the copper foil to be the negative electrode current collector 11 by applying a coating liquid containing a negative electrode active material (step S2). Examples of the coating liquid containing a negative electrode active material include lithium titanate (Li ₄ Ti ₅ O ₁₂ ) as a negative electrode active material, acetylene black or ketjen black as a conductive additive, and polyvinylidene fluoride as a binder. (PVDF), styrene butadiene rubber (SBR), polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA) or polytetrafluoroethylene (PTFE), a mixture of N-methyl-2-pyrrolidone (NMP) as a solvent, etc. Can be used. In the present embodiment, the coating liquid containing such a negative electrode active material is applied by a nozzle dispensing method, particularly a nozzle scanning method in which a discharge head that discharges the coating liquid is moved relative to the surface to be coated. Details will be described later.

Next, a coating solution containing a solid electrolyte material is applied by spin coating to the surface of the laminate formed by laminating the grid-like negative electrode active material layer 12 on the negative electrode current collector 11 to form the solid electrolyte layer 13. (Step S3). Examples of the coating solution containing the solid electrolyte material include polyethylene oxide and / or polystyrene as a polymer electrolyte material, lithium hexafluorophosphate (LiPF ₄ ) as a supporting salt, and diethylene carbonate as a solvent. A mixture can be used. According to the spin coating method, even in a lattice-shaped uneven pattern formed by laminating the negative electrode active material layer 12 on the surface of the negative electrode current collector 11, the solid electrolyte layer 13 having a uniform thickness along the unevenness. Can be formed.

Next, a coating solution containing a positive electrode active material is applied to the surface of the solid electrolyte layer 13 by a knife coating method to form the positive electrode active material layer 14 (step S4). As a coating liquid containing a positive electrode active material, for example, lithium cobalt oxide (LiCoO ₂ ) as a positive electrode active material, acetylene black as a conductive additive, styrene butadiene rubber (SBR) as a binder, A mixture of carboxymethyl cellulose (CMC) and pure water as a solvent can be used. According to the knife coating method, the upper surface of the positive electrode active material layer 14 can be flattened while filling the uneven pattern on the surface of the solid electrolyte layer 13.

  Thereafter, a metal foil (aluminum foil in the present embodiment) that becomes the positive electrode current collector 15 is laminated on the upper surface of the flat positive electrode active material layer 14 (step S5). Generally, the lithium ion secondary battery 1 shown in FIGS. Hereinafter, application of the coating liquid containing the negative electrode active material in step S2 will be described in detail.

<2-1. Application of negative electrode active material>
FIG. 5 is a diagram illustrating a configuration of the coating unit 2 used in the nozzle scanning method in step S2. In FIG. 5 and subsequent figures, an XYZ orthogonal coordinate system in which the Z-axis direction is the vertical direction and the XY plane is the horizontal plane is appropriately attached in order to clarify the directional relationship. Moreover, in each figure, the dimension and number of each part are drawn exaggerated or simplified as needed for easy understanding.

  In this coating unit 2, a stage moving mechanism 20 is provided on a base 21, and a stage 30 that holds the negative electrode current collector 11 (or a carrier such as a glass plate to which the negative electrode current collector 11 is attached) is a stage moving mechanism. 20 is movable in the horizontal plane (in the XY plane). A discharge head 40 is fixedly installed above the stage 30. That is, in the present embodiment, the stage 30 that holds the negative electrode current collector 11 moves in a horizontal plane with respect to the discharge head 40 that is fixedly installed, so that the discharge head 40 is relative to the negative electrode current collector 11. Will move.

  The stage moving mechanism 20 includes an X direction moving mechanism 21 that moves the stage 30 in the X direction from the lower stage, a Y direction moving mechanism 22 that moves in the Y direction perpendicular to the X direction, and an axis along the vertical direction (Z direction). Is provided with a θ rotation mechanism 23 that rotates around the center. The X-direction moving mechanism 21 has a structure in which a ball screw 212 is connected to a motor 211 and a nut 213 fixed to the Y-direction moving mechanism 22 is screwed into the ball screw 212. When the guide rail 214 is fixed above the ball screw 212 and the motor 211 rotates, the Y-direction moving mechanism 22 moves smoothly along the guide rail 214 in the X direction along with the nut 213.

  The Y-direction moving mechanism 22 includes a motor 221, a ball screw mechanism, and a guide rail 224. When the motor 221 rotates, the θ rotation mechanism 23 moves in the Y direction along the guide rail 224 by the ball screw mechanism. The θ rotation mechanism 23 rotates the stage 30 about the axis along the Z direction by the motor 231. With the above configuration, the ejection head 40 is freely moved relative to the negative electrode current collector 11 in the X direction and the Y direction by the stage moving mechanism 20, and the posture with respect to the negative electrode current collector 11 can be changed.

  One end of a supply pipe 422 is connected to the ejection head 40 that is fixedly installed. A check valve 421 is inserted in the supply pipe 422. The other end of the supply pipe 422 is bifurcated, one of which is connected to the pump 423 and the other is connected to the tank 425 for storing the coating liquid containing the negative electrode active material via the control valve 424.

  FIG. 6 is a cross-sectional view showing the internal structure of the ejection head 40. 6A shows a cross section of the discharge head 40 cut along the YZ plane, and FIG. 6B shows a cross section cut along the XZ plane. As shown in FIG. 6, a cavity functioning as a buffer space BF is formed inside the ejection head 40, and a negative electrode active material coating liquid fed to the buffer space BF via a supply pipe 422 is formed. It is sent. The discharge head 40 is formed with a plurality of flow paths 41 extending downward from the buffer space BF. The plurality of flow paths 41 are provided in a row at equal intervals along the Y direction. The lower end opening of each flow path 41 forms a discharge port 44. Therefore, a plurality of discharge ports 44 are arranged in the Y direction on the lower end surface of the discharge head 40. Note that the number of ejection ports 44 provided in the ejection head 40 is not particularly limited, and may be an appropriate number corresponding to the width of the stage 30.

  Each motor of the stage moving mechanism 20, the pump 423, and the control valve 424 are electrically connected to the control unit 38. The configuration of the control unit 38 as hardware is the same as that of a general computer. That is, the control unit 38 stores a CPU that performs various arithmetic processes, a ROM that is a read-only memory that stores basic programs, a RAM that is a readable and writable memory that stores various information, control software, data, and the like. It is configured with a magnetic disk to be placed. When the CPU of the control unit 38 executes a predetermined processing program, the above-described components of the coating unit 2 are controlled by the control unit 38, and the coating process of the coating liquid containing the negative electrode active material proceeds.

  Next, the application | coating operation | movement of the coating liquid containing a negative electrode active material by the coating unit 2 which has the above structures is demonstrated. FIG. 7 is a flowchart showing the procedure of the coating operation by the coating unit 2. First, the negative electrode current collector 11 prepared in step S1 of FIG. 4 is placed on the upper surface of the stage 30 (step S21). The negative electrode current collector 11 is fixed to the upper surface of the stage 30 by a clamp mechanism (not shown).

  Next, the control unit 38 drives and controls each motor of the stage moving mechanism 20 to move the negative electrode current collector 11 held on the stage 30 to the application start position (step S22). The application start position may be a position where the ejection head 40 is directly above the end of the negative electrode current collector 11 (in this embodiment, directly above the (+ X) side end), or the end of the negative electrode current collector 11. It may be slightly above the outside. Then, after the negative electrode current collector 11 reaches the application start position, the discharge of the coating liquid containing the negative electrode active material is started from the discharge head 40 (step S23).

  The discharge of the coating liquid from the discharge head 40 is performed by the check valve 421, the pump 423, and the control valve 424 shown in FIG. First, the pump 423 performs a suction operation with the control valve 424 opened under the control of the control unit 38. At this time, since the check valve 421 prevents the backflow of the coating liquid from the discharge head 40, the coating liquid containing the negative electrode active material is sucked from the tank 425 to the pump 423. Next, the control valve 424 is closed under the control of the control unit 38, and the pump 423 performs an extrusion operation. As a result, the coating liquid containing the negative electrode active material is fed from the pump 423 to the ejection head 40. The supplied coating liquid is once sent into the buffer space BF in the discharge head 40 and then discharged downward from the plurality of discharge ports 44. As described above, since the ejection head 40 ejects the coating liquid through the buffer space BF, the coating liquid containing the negative electrode active material at a uniform flow rate from the plurality of ejection ports 44 arranged in the Y direction. Can be discharged.

  At the same time as the discharge of the coating liquid is started, the control unit 38 controls the stage moving mechanism 20 to start the movement of the stage 30. In the present embodiment, the stage 30 repeats the movement of a predetermined distance in the X direction and the Y direction while continuously discharging the coating liquid containing the negative electrode active material from the plurality of discharge ports 44 of the discharge head 40. That is, the control unit 38 first drives and controls the X direction moving mechanism 21 of the stage moving mechanism 20 to move the stage 30 in the (+ X) direction by a predetermined X direction scanning distance Dx (step S24), and then moves in the Y direction. The mechanism 22 is driven and controlled to move the stage 30 in the (+ Y) direction by a predetermined Y direction scanning distance Dy (step S25). Subsequently, the control unit 38 drives and controls the X direction moving mechanism 21 again to move the stage 30 in the (+ X) direction by the X direction scanning distance Dx (step S26), and further drives and controls the Y direction moving mechanism 22. The stage 30 is moved in the (−Y) direction by the Y-direction scanning distance Dy (step S27).

  If the negative electrode current collector 11 has not reached the application end position when the movement of step S27 is completed, the process returns to step S24 again (step S28). That is, the moving operation from step S24 to step S27 is repeated until the negative electrode current collector 11 reaches the coating end position. As a result, the coating liquid containing the negative electrode active material is applied to the surface of the negative electrode current collector 11 in a grid pattern.

  FIG. 8 is a diagram illustrating the trajectories of the plurality of discharge ports 44 that move relative to the negative electrode current collector 11. The main body of the moving operation described above is the stage 30, and the direction of the relative movement of the discharge head 40 with respect to the negative electrode current collector 11 held on the stage 30 is inevitably the movement of the stage 30 shown in steps S24 to S27. The direction is the opposite. That is, in step S24, the ejection head 40 moves in the (−X) direction by the X-direction scanning distance Dx with respect to the negative electrode current collector 11, and in step S25, the ejection head 40 moves in the (−Y) direction by the Y-direction scanning distance Dy. Similarly, in step S26, the ejection head 40 moves in the (−X) direction by the X direction scanning distance Dx with respect to the negative electrode current collector 11, and in step S27, the Y direction scanning distance Dy moves in the (+ Y) direction. By repeating Step S24 to Step S27, the relative movement in the X direction and the relative movement in the Y direction of the discharge head 40 with respect to the negative electrode current collector 11 are alternately repeated. As a result, as shown in FIG. 8, each of the plurality of discharge ports 44 of the discharge head 40 draws a zigzag locus on the negative electrode current collector 11.

  In the present embodiment, the Y-direction scanning distance Dy, which is a single relative movement amount of the discharge head 40 with respect to the negative electrode current collector 11 in the Y direction, and the arrangement pitch P of the plurality of discharge ports 44 (the adjacent discharge ports 44 (Interval) is made equal. For this reason, the locus of a certain discharge port 44 is in point contact with the locus of the adjacent discharge port 44 at an inflection point (a point at which the movement in the X direction and the Y direction is switched) to form a lattice point.

  Also, the X-direction scanning distance Dx, which is a single relative movement amount of the ejection head 40 with respect to the negative electrode current collector 11 in the X direction, and the Y-direction scanning distance Dy, which is a single relative movement amount in the Y direction, are made equal. ing. Therefore, the locus drawn by the plurality of discharge ports 44 on the negative electrode current collector 11 is a square lattice pattern as shown in FIG.

  While the coating liquid containing the negative electrode active material is continuously discharged from the plurality of discharge ports 44 of the discharge head 40, the relative movement in the X direction and the relative movement in the Y direction of the discharge head 40 with respect to the negative electrode current collector 11 are alternately performed. When the plurality of discharge ports 44 move relative to each other so as to draw a square lattice-like locus on the negative electrode current collector 11, the coating liquid containing the negative electrode active material is applied to the surface of the negative electrode current collector 11. It will be applied in the form of a square lattice. As a result, as shown in FIG. 9, the negative electrode active material layer 12 having a square lattice-like convex pattern is formed on the surface of the negative electrode current collector 11.

  By the way, if the relative movement of the ejection head 40 in the X direction and the relative movement in the Y direction are selectively switched and repeated, the locus of the adjacent ejection ports 44 overlaps at the lattice points of the square lattice pattern. The coating liquid is overcoated. Then, the negative electrode active material layer 12 swells thicker at the lattice points of the square lattice pattern than at other portions. Such uneven bulging of the negative electrode active material layer 12 is not preferable because it may cause a short circuit in the lithium ion secondary battery 1.

  For this reason, in this embodiment, unnecessary overlapping of the coating liquid is prevented by slightly overlapping the relative movement period in the X direction and the relative movement period in the Y direction of the ejection head 40. Specifically, the relative movement in the (−Y) direction in step S25 is started immediately before the ejection head 40 finishes the relative movement in the (−X) direction in step S24. Similarly, the relative movement in the (−X) direction in step S26 is started immediately before the ejection head 40 finishes the relative movement in the (−Y) direction in step S25. Thereafter, by repeating the same procedure, as shown in FIG. 9, the coating liquid discharged from the adjacent discharge ports 44 comes into contact but is prevented from being overcoated. As a result, the thickness of the negative electrode active material layer 12 laminated on the surface of the negative electrode current collector 11 becomes uniform, and a short circuit in the lithium ion secondary battery 1 is prevented. The Y-direction scanning distance Dy of the ejection head 40 may be made slightly shorter than the arrangement pitch P of the plurality of ejection ports 44 to prevent overcoating of the coating liquid.

  On the other hand, when the negative electrode current collector 11 has reached the coating end position in step S28, the discharge of the coating liquid from the discharge head 40 is stopped by the control of the control unit 38, and the movement of the stage 30 is also performed. Stop (step S29). Then, the negative electrode current collector 11 on which the negative electrode active material layer 12 is laminated is removed from the stage 30 to complete the negative electrode active material coating process (step S2 in FIG. 4).

  As described above, the coating process of the coating liquid containing the negative electrode active material is performed by the nozzle scanning method in which the ejection head 40 is moved relative to the negative electrode current collector 11. Thus, the negative electrode active material layer 12 having a square lattice-like convex pattern as shown in FIG. More specifically, by alternately repeating the relative movement in the X direction and the relative movement in the Y direction of the discharge head 40 with respect to the negative electrode current collector 11, a square lattice pattern is formed on the surface of the negative electrode current collector 11. The negative electrode active material layer 12 having a convex pattern is formed. As shown in FIG. 9, in the coating process by the nozzle scanning method of the present embodiment, the end portion of the convex pattern is not necessarily a continuous straight line. However, this is not a particular disadvantage in the present invention. The reason for this is that, in the present invention, the formation of the negative electrode active material layer 12 having a square lattice-like convex pattern on the surface of the negative electrode current collector 11 increases the contact area between the active material layer and the solid electrolyte layer. This is to improve the efficiency of the battery reaction, and it is not necessary to make the end of the convex pattern a strictly continuous linear shape.

<2-2. Application of electrolyte>
A coating liquid containing a solid electrolyte material is applied by spin coating to the laminate in which the negative electrode active material layer 12 is formed in a lattice pattern on the surface of the negative electrode current collector 11 by the coating unit 2. FIG. 10 is a diagram showing a schematic configuration of the rotary coating unit 3 used in the spin coating method in step S3.

  The spin base 51 that holds the laminate in which the negative electrode active material layer 12 is formed on the negative electrode current collector 11 is rotated by a motor 52 about an axis along the vertical direction. As a mechanism for the spin base 51 to hold the laminate, the back surface of the negative electrode current collector 11 may be adsorbed, or the edge of the negative electrode current collector 11 may be mechanically held. May be. The cup 53 is installed so as to surround the spin base 51, and receives and collects the coating liquid scattered from the rotating spin base 51 and the laminated body.

  A discharge nozzle 54 is installed above the spin base 51. The discharge nozzle 54 is supplied with a coating liquid containing a solid electrolyte material from an electrolyte coating liquid supply mechanism 55 having a pump and a tank (not shown). The coating liquid containing the solid electrolyte material supplied from the electrolyte coating liquid supply mechanism 55 is discharged from the discharge nozzle 54 to the rotation center of the stacked body held on the spin base 51.

  The laminate in which the negative electrode active material layer 12 is formed in a lattice pattern on the surface of the negative electrode current collector 11 is held by a spin base 51 and rotated by a motor 52 at a constant speed in a predetermined direction around an axis along the vertical direction. The Then, the coating liquid containing the solid electrolyte material is discharged from the discharge nozzle 54 to the rotation center of the laminate that is rotated at a predetermined speed. The coating liquid dropped on the surface of the negative electrode current collector 11 on which the negative electrode active material layer 12 is formed spreads around by centrifugal force, and the excess coating liquid is shaken off from the end of the negative electrode current collector 11. In this manner, the coating liquid containing the solid electrolyte material is applied to the surface of the negative electrode current collector 11 on which the negative electrode active material layer 12 is formed in a square lattice shape with a substantially uniform thickness. Then, by curing this, the solid electrolyte layer 13 is formed on the surface of the negative electrode current collector 11 on which the negative electrode active material layer 12 is formed.

  FIG. 11 is a top view of the laminate at the time when the solid electrolyte layer 13 is formed. FIG. 12 is a longitudinal sectional view of the laminate of FIG. In the spin coating method using the rotary coating unit 3, the negative electrode current collector 11 on which the negative electrode active material layer 12 having a square lattice-like convex pattern is formed is uniform along the unevenness caused by the convex pattern. It is possible to perform a coating process with a proper thickness. As a result, as shown in FIGS. 11 and 12, a solid electrolyte layer 13 having irregularities following the square lattice-shaped convex pattern of the negative electrode active material layer 12 can be formed.

  The thickness of the solid electrolyte layer 13 to be formed is arbitrary, but the thickness is such that the negative electrode active material layer 12 and the positive electrode active material layer 14 are reliably separated and the internal resistance is less than an allowable value. is required. The thickness of the solid electrolyte layer 13 can be adjusted by the viscosity of the coating solution and the rotation speed of the spin base 51. From the viewpoint of not destroying the significance of the unevenness of the negative electrode active material layer 12 provided to increase the surface area, the thickness t13 of the solid electrolyte layer 13 is smaller than the height difference t12 of the unevenness of the negative electrode active material layer 12. It is desirable.

<2-3. Application of positive electrode active material>
A coating liquid containing a positive electrode active material is applied by a knife coating method to the laminate in which the solid electrolyte layer 13 that follows the lattice-like convex pattern of the negative electrode active material layer 12 is formed. FIG. 13 is a diagram schematically illustrating a state in which the coating liquid of the positive electrode active material is applied by the knife coating method.

  The laminated body in which the grid-like negative electrode active material layer 12 and the solid electrolyte layer 13 following the convex pattern are formed on the surface of the negative electrode current collector 11 is held in a stationary state in a horizontal posture on a stage not shown. . Then, the nozzle 61 that continuously discharges the coating liquid containing the positive electrode active material is scanned and moved above the laminate in the direction of the horizontal arrow AR13. Thereby, the convex part of the solid electrolyte layer 13 is covered with the coating liquid while the concave part of the solid electrolyte layer 13 is filled with the coating liquid. The nozzle 61 may be a slit nozzle having a slit-like discharge port extending along the width direction of the negative electrode current collector 11 (direction perpendicular to the paper surface of FIG. 13), or along the width direction. A plurality of discharge ports may be arranged in a row.

  A blade 62 is attached to the nozzle 61. The blade 62 is attached to the rear side of the discharge port in the traveling direction of the nozzle 61 (the direction of the arrow AR13). The lower end of the blade 62 is in contact with the coating liquid containing the positive electrode active material discharged from the nozzle 61 at a position above the upper end of the solid electrolyte layer 13. The upper surface of the coating solution is leveled by moving the blade 62 along the horizontal direction while contacting the lower end of the blade 62 with the coating solution.

  In this way, the upper surface of the coating liquid is leveled by the blade 62 while discharging the coating liquid containing the positive electrode active material from the nozzle 61 that is moved by scanning, thereby filling the concave portion of the solid electrolyte layer 13 and forming the convex portion. A positive electrode active material layer 14 having a flat upper surface is formed while covering.

  A positive electrode current collector 15 is laminated on the upper surface of the positive electrode active material layer 14 thus formed. At this time, it is preferable to laminate the positive electrode current collector 15 on the upper surface of the positive electrode active material layer 14 formed by the knife coating method before it is cured. By doing so, the positive electrode active material layer 14 and the positive electrode current collector 15 can be bonded to each other and bonded together. Moreover, since the upper surface of the positive electrode active material layer 14 is leveled flat, it is easy to stack the positive electrode current collector 15 without any gap. As described above, the lithium ion secondary battery 1 shown in FIGS. 1 and 2 is manufactured.

<3. Advantages of Manufacturing Method of Present Embodiment>
In the manufacturing method of the lithium ion secondary battery 1 of the present embodiment, the negative electrode current collector 11 is coated with a coating liquid containing a negative electrode active material to form the negative electrode active material layer 12, and the solid electrolyte material is included thereon. A solid electrolyte layer 13 is formed by applying a coating liquid, and a positive electrode active material layer 14 is formed by applying a coating liquid containing a positive electrode active material thereon. Thus, since the coating liquid used as the material of each functional layer is piled up in order, the number of processes is small, and the lithium ion secondary battery 1 can be manufactured with high productivity.

  More specifically, since the negative electrode active material layer 12 having a grid-like convex pattern is formed by applying a nozzle scan method in which the discharge head 40 is moved relative to the negative electrode current collector 11, high throughput is achieved. A convex pattern can be formed. In particular, while continuously discharging the coating liquid containing the negative electrode active material from the plurality of discharge ports 44 of the discharge head 40, the plurality of discharge ports 44 are relatively moved together to form a square lattice-shaped convex pattern. Therefore, the time required for forming the negative electrode active material layer 12 can be remarkably shortened.

  The solid electrolyte layer 13 is formed by applying a spin coating method suitable for performing a coating process with a uniform thickness following the convex pattern of the negative electrode active material layer 12. If the spin coating method is used, the coating liquid containing the solid electrolyte material is dropped while rotating the laminate in which the grid-like negative electrode active material layer 12 is formed on the negative electrode current collector 11. The solid electrolyte layer 13 having irregularities following the pattern can be formed with high throughput.

  Furthermore, since the lower surface of the positive electrode active material layer 14 is required to follow the unevenness of the solid electrolyte layer 13 and the upper surface is flat, a knife coating method is used in which the upper surface is flattened by the blade 62. Yes. In this knife coating method, it is sufficient if uniform coating can be performed while filling the unevenness of the solid electrolyte layer 13, and the processing can be completed in a short time.

  In the present embodiment, since the negative electrode active material layer 12 having a square lattice-like convex pattern is formed on the surface of the negative electrode current collector 11, the contact surface between the negative electrode active material layer 12 and the solid electrolyte layer 13. Becomes a concave and convex surface in the form of a square lattice, and the contact area between them can be increased. Since the solid electrolyte layer 13 also has irregularities following the convex pattern of the negative electrode active material layer 12, the contact surface between the positive electrode active material layer 14 and the solid electrolyte layer 13 is also a square lattice-shaped irregular surface similar to the above. , Their contact area can be increased. Thereby, the contact area of both active material layers and the solid electrolyte layer 13 can be increased, the efficiency of the battery reaction in the lithium ion secondary battery 1 can be improved, and high output can be obtained.

  In addition, since the negative electrode active material layer 12 having a square lattice-like convex pattern is formed on the surface of the negative electrode current collector 11, the adhesion between the negative electrode current collector 11 and the negative electrode active material layer 12 is strong. For this reason, even if it is immediately after apply | coating the coating liquid containing a negative electrode active material, the negative electrode active material layer 12 is prevented from peeling from the negative electrode collector 11. FIG.

  Further, since the convex pattern of the negative electrode active material layer 12 is a square lattice, the unevenness distribution on the contact surface between the active material layer and the solid electrolyte layer 13 can be made uniform. For this reason, the output density in the surface of the lithium ion secondary battery 1 can be made uniform, and the battery reaction can be stabilized.

  Furthermore, the lithium ion secondary battery 1 manufactured by the manufacturing method of this embodiment is thin and easy to bend.

<4. Application examples of lithium-ion batteries>
As described above, the lithium ion secondary battery 1 manufactured by the manufacturing method of the present embodiment is thin and has good battery reaction efficiency. Such a lithium ion secondary battery 1 includes, for example, electric vehicles (including hybrid electric vehicles), electric assist bicycles, electric tools, robots, and other machines, personal computers, mobile phones, portable music players, digital cameras, It can be used for mobile devices such as video cameras, smart IC cards, game machines, portable measuring devices, various electronic devices such as communication devices and toys.

  Below, although the example of the apparatus which mounts the lithium ion secondary battery 1 which concerns on this invention is demonstrated, these are some examples of the apparatus which can apply the lithium ion secondary battery 1 of this embodiment. The application range of the lithium ion secondary battery 1 according to the present invention is not limited to these.

  FIG. 14 is a diagram schematically showing a vehicle, specifically an electric vehicle, as an example of a device equipped with the lithium ion secondary battery 1 according to the present invention. The electric vehicle 70 includes a wheel 71, a motor 72 that drives the wheel 71, and a battery 73 that supplies power to the motor 72. As the battery 73, a battery in which a plurality of lithium ion secondary batteries 1 of the above embodiment are connected in series and in parallel can be mounted on the electric vehicle 70. Since the lithium ion secondary battery 1 of the present embodiment has a good battery reaction efficiency, it can obtain a high output even if it is small and can be charged in a short time. It is suitable as a power source for driving a vehicle.

  FIG. 15 is a diagram schematically showing an electronic device, specifically an IC card (smart card), as another example of a device in which the lithium ion secondary battery 1 according to the present invention is mounted. The IC card 80 is superposed on each other to form a pair of housings 81 and 82 constituting a card-type package, a circuit module 83 housed in the housing, and a battery 84 serving as a power source for the circuit module 83. And. The circuit module 83 includes a loop-shaped antenna 831 for communication with the outside, and a circuit unit 832 including an integrated circuit (IC) that performs data exchange with the external device via the antenna 831 and various arithmetic / storage processes. And. As the battery 84, a battery including one set or a plurality of sets of the lithium ion secondary battery 1 of the present embodiment can be used, and the circuit unit 832 operates using the battery 84 as a power source.

  According to such a configuration, the communicable distance with the external device can be extended and more complicated processing can be performed as compared with a general IC card that does not have a power supply. Become. Since the lithium ion secondary battery 1 according to the present invention is thin and has a large capacity, it is also suitable as a power source for such a card-type device.

<5. Modification>
While the embodiments of the present invention have been described above, the present invention can be modified in various ways other than those described above without departing from the spirit of the present invention. For example, in the above embodiment, the negative electrode active material layer 12 having a square lattice-like convex pattern is formed on the surface of the negative electrode current collector 11, but the convex pattern is not limited to the square lattice shape, Other shapes may be used. For example, in the above embodiment, the X direction scanning distance Dx and the Y direction scanning distance Dy are set to different values, and the relative movement in the X direction and the relative movement in the Y direction of the ejection head 40 with respect to the negative electrode current collector 11 are alternately repeated. The negative electrode active material layer 12 having a rectangular grid-like convex pattern may be formed on the surface of the negative electrode current collector 11.

  Further, as shown in FIG. 16, the Y-direction scanning distance Dy, which is the relative movement amount in the Y-direction, and the arrangement pitch P of the plurality of discharge ports 44 are set to different values, and the X of the discharge head 40 with respect to the negative electrode current collector 11 is set. The negative electrode active material layer 12 having a zigzag convex pattern on the surface of the negative electrode current collector 11 may be formed by alternately and repeatedly performing relative movement in the direction and relative movement in the Y direction. .

  In addition, as shown in FIG. 17, the discharge head 40 is sine with respect to the negative electrode current collector 11 while the coating liquid containing the negative electrode active material is continuously discharged from a plurality of discharge ports 44 arranged in the discharge head 40. You may make it form the negative electrode active material layer 12 which has a sinusoidal convex pattern on the surface of the negative electrode collector 11 by making relative movement so that a curve may be drawn.

  8, 16, and 17 show that the discharge head 40 is moved relative to the negative electrode current collector 11 while continuously discharging the coating liquid containing the negative electrode active material from the plurality of discharge ports 44. Thus, the plurality of discharge ports 44 are collectively moved relative to each other, and a coating liquid containing a negative electrode active material is applied to the surface of the negative electrode current collector 11 in a plurality of lines. By forming the negative electrode active material layer 12 having a predetermined convex pattern on the surface of the negative electrode current collector 11 in this way, the contact surface between the negative electrode active material layer 12 and the positive electrode active material layer 14 and the solid electrolyte layer 13 becomes an uneven surface. The contact area of the lithium ion secondary battery 1 can be improved by increasing the contact area thereof. Further, since the plurality of discharge ports 44 arranged in the discharge head 40 are relatively moved together to apply the coating liquid containing the negative electrode active material to the surface of the negative electrode current collector 11 in a plurality of lines, it is high. The negative electrode active material layer 12 can be formed with a high throughput.

  Further, the coating pattern for forming the negative electrode active material layer 12 may be as shown in FIG. Also in the coating pattern shown in FIG. 18, a plurality of coating liquids containing a negative electrode active material are applied to the surface of the negative electrode current collector 11 in a linear shape. However, the plurality of lines that are the locus of application are not parallel to each other, and the application pattern shown in FIG. 18 is drawn by moving a nozzle having a single discharge port relative to the negative electrode current collector 11. . Specifically, the surface of the negative electrode current collector 11 is moved by moving the nozzle relative to the negative electrode current collector 11 while continuously discharging the coating liquid containing the negative electrode active material from a single discharge port. A plurality of coating solutions containing a negative electrode active material are applied in a linear form. At this time, a plurality of nozzles each having a single discharge port may be individually moved relative to each other, or one nozzle having a single discharge port may be relatively moved repeatedly. Even in this case, the contact surfaces of the negative electrode active material layer 12 and the positive electrode active material layer 14 and the solid electrolyte layer 13 become uneven surfaces, and the contact area is increased to increase the efficiency of the battery reaction in the lithium ion secondary battery 1. Can be made good. However, as in the above-described embodiment, it is possible to easily obtain a high throughput if the ejection head 40 having the plurality of ejection ports 44 is relatively moved to apply the coating liquid in a lump.

  Further, the relative movement direction of the discharge head 40 (or the nozzle having a single discharge port) with respect to the negative electrode current collector 11 is not limited to the X direction and the Y direction, and may be three or more directions. Moreover, even if it is two directions, they are not limited to perpendicular | vertical, You may make arbitrary angles.

  In short, a negative electrode active material having a predetermined convex pattern by applying a coating liquid containing a negative electrode active material linearly along the second direction different from the first direction and the first direction on the surface of the negative electrode current collector 11. Any form that forms the layer 12 may be used.

  In the above embodiment, the negative electrode active material layer 12 is formed on the surface of the negative electrode current collector 11 by the nozzle scan method. However, the present invention is not limited to this, and the positive electrode current collector is formed by the nozzle scan method. The positive electrode active material layer 14 may be formed on the surface of the body 15. That is, while continuously discharging a coating liquid containing a positive electrode active material from a plurality of discharge ports 44 of the discharge head 40, the positive electrodes having a square lattice-like convex pattern by collectively moving the plurality of discharge ports 44 collectively. The active material layer 14 may be formed. In this case, contrary to the above embodiment, the solid electrolyte layer 13 is formed on the positive electrode active material layer 14 by spin coating, the negative electrode active material layer 12 is formed thereon by knife coating, and further thereon The negative electrode current collector 11 may be laminated on the substrate.

  Further, the electrolyte layer sandwiched between the negative electrode active material layer 12 and the positive electrode active material layer 14 is not limited to a solid electrolyte, and may be a liquid electrolyte. Specifically, as in the above embodiment, a coating liquid containing a negative electrode active material is applied to the surface of the negative electrode current collector 11 linearly along at least a first direction and a second direction different from the first direction. A negative electrode active material layer 12 having a predetermined convex pattern is formed. Similarly, a positive electrode active material layer 14 is formed by applying a coating liquid containing a positive electrode active material to the surface of the positive electrode current collector 15. Then, a resin separator (for example, a porous insulating film) impregnated with the electrolytic solution is sandwiched between the negative electrode active material layer 12 and the positive electrode active material layer 14. Even in this case, the contact area between the negative electrode active material layer 12 and the positive electrode active material layer 14 and the liquid electrolyte layer can be increased, and the efficiency of the battery reaction can be improved. Further, similarly to the above embodiment, the lithium ion secondary battery having such a structure can be manufactured with high productivity.

  In the above embodiment, the spin coating method is applied to form the solid electrolyte layer 13. However, the solid electrolyte layer 13 having irregularities following the convex pattern of the negative electrode active material layer 12 may be formed. As long as it is a possible application method, other methods may be used. For example, a coating solution containing a solid electrolyte material may be applied by a spray coating method or a droplet method. Similarly, the formation of the positive electrode active material layer 14 is not limited to the knife coating method, and the positive electrode active material layer 14 having a flat upper surface is formed while filling the concave portion of the solid electrolyte layer 13 and covering the convex portion. As long as the coating method can be applied, other methods may be used, and a nozzle scan method, a slit coating method, a bar coating method, or the like can be applied.

  The materials such as the current collector, the active material, and the electrolyte exemplified in the above embodiment are only examples, and are not limited thereto, and may be used as a constituent material of a lithium ion secondary battery. Even in the case of manufacturing a lithium ion secondary battery using this material, the manufacturing method according to the present invention can be preferably applied. Moreover, you may make it apply the manufacturing method based on this invention not only to a lithium ion secondary battery but to manufacture of other types of chemical batteries, such as a lithium ion primary battery and an alkaline battery.

  The present invention can be suitably applied to battery manufacturing technology, and is particularly suitable for manufacturing a low-cost, small-sized, high-power battery with high productivity.

DESCRIPTION OF SYMBOLS 1 Lithium ion secondary battery 2 Application | coating unit 11 Negative electrode collector 12 Negative electrode active material layer 13 Solid electrolyte layer 14 Positive electrode active material layer 15 Positive electrode collector 20 Stage moving mechanism 30 Stage 38 Control part 40 Discharge head 44 Discharge port 70 Electricity Automobile 80 IC card

Claims (9)

The first current collector has a predetermined convex pattern by applying a coating liquid containing the first active material in a linear manner along at least a first direction and a second direction different from the first direction on the surface of the first current collector. A first active material layer forming step of forming an active material layer;
Electrolyte layer formation for applying a coating solution containing a solid electrolyte material on the surface of the first current collector on which the first active material layer is formed, and forming an electrolyte layer having irregularities following the convex pattern of the first active material layer Process,
A second active material layer forming step of applying a coating liquid containing a second active material on the surface of the electrolyte layer, filling a concave portion of the electrolyte layer and forming a second active material layer covering the convex portion of the electrolyte layer When,
A method for producing a battery, comprising: In the manufacturing method of the battery of Claim 1,
A method for producing a battery, further comprising a step of laminating a second current collector on a surface of the second active material layer. In the manufacturing method of the battery according to claim 1 or 2,
The first active material layer forming step moves the discharge head relative to the first current collector while discharging the coating liquid containing the first active material from a plurality of discharge ports arranged in a row on the discharge head. A method for producing a battery, comprising: applying a coating liquid containing a first active material in a plurality of lines on the surface of a first current collector. In the manufacturing method of the battery of Claim 3,
The first direction and the second direction are orthogonal to each other,
The plurality of ejection openings are arranged in the ejection head along the second direction,
In the first active material layer forming step, the relative current movement of the ejection head in the first direction and the relative movement in the second direction with respect to the first current collector are alternately and repeatedly performed, whereby the first current collector is performed. A method for manufacturing a battery, comprising forming a first active material layer having a lattice-like convex pattern on a surface of a body. In the manufacturing method of the battery of Claim 4,
By making the relative movement amount of one time of the ejection head in the first direction equal to the relative movement amount of one time in the second direction, a convex pattern having a square lattice shape on the surface of the first current collector A method for producing a battery, comprising: forming a first active material layer having the following. The first current collector has a predetermined convex pattern by applying a coating liquid containing the first active material in a linear manner along at least a first direction and a second direction different from the first direction on the surface of the first current collector. A first active material layer forming step of forming an active material layer;
A second active material layer forming step of forming a second active material layer by applying a coating liquid containing a second active material on the surface of the second current collector;
An electrolyte layer forming step of sandwiching the electrolyte layer between the first active material layer and the second active material layer;
A method for producing a battery, comprising:   A battery manufactured by the battery manufacturing method according to claim 1.   A vehicle comprising the battery according to claim 7. A battery according to claim 7;
A circuit unit that operates using the battery as a power source;
An electronic device comprising:

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