Battery manufacturing method and battery manufacturing system

Abstract

Increase productivity. [Solution] The method for manufacturing a battery includes the steps of: fixing each of the multiple power generation elements contained in a flat plate (S12); separating the multiple power generation elements individually by cutting the flat plate (S14); holding the multiple power generation elements with a plurality of holding units whose relative positions can be changed (S16); changing the relative positions of at least two of the multiple power generation elements with the plurality of holding units so that they are in a position suitable for the next processing (S18); and performing the following processing on at least two of the multiple power generation elements held by the plurality of holding units (S20).

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a battery and a battery manufacturing system.

Background Art

[0002] Patent Document 1 discloses adsorbing after cutting a battery element.

[0003] Patent Document 2 discloses cutting after adsorbing a battery base material.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the prior art, further improvement in battery productivity is desired. In particular, the production efficiency after fragmenting large-sized members is an important point in practical manufacturing characteristics.

[0006] Therefore, the present disclosure provides a method for manufacturing a battery and a battery manufacturing system that can enhance productivity.

Means for Solving the Problems

[0007] A method for manufacturing a battery according to one aspect of the present disclosure includes the steps of: fixing each of a plurality of power generation elements contained in a flat plate; separating the plurality of power generation elements individually by cutting the flat plate; holding the plurality of power generation elements with a plurality of holding units whose relative positions can be changed; changing the relative positions of at least two of the plurality of power generation elements with the plurality of holding units so that they are in a position suitable for the next process; and performing the next process on at least two of the plurality of power generation elements held by the plurality of holding units.

[0008] A battery manufacturing system according to one aspect of the present disclosure includes: a cutting device that cuts a plate while each of the multiple power generation elements contained in the plate is fixed, thereby separating the multiple power generation elements individually; a plurality of holding units that hold the multiple power generation elements and whose relative positions can be changed; a control unit that controls the plurality of holding units to change the relative positions of at least two of the multiple power generation elements to a position suitable for the next processing; and a processing device that performs the next processing on at least two of the multiple power generation elements held by the plurality of holding units. [Effects of the Invention]

[0009] This disclosure provides a battery manufacturing method and a battery manufacturing system that can increase productivity. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a plan view of a flat plate containing a plurality of power generation elements according to Embodiment 1. [Figure 2] Figure 2 is a cross-sectional view of a flat plate containing multiple power generation elements according to Embodiment 1. [Figure 3] Figure 3 is a schematic diagram showing the top, side, and front views of a first example of a holding unit according to Embodiment 1. [Figure 4] Figure 4 is a schematic diagram showing the top, side, and front views of a second example of the holding unit according to Embodiment 1. [Figure 5]Figure 5 is a schematic diagram showing the top, side, and front views of a third example of the holding unit according to Embodiment 1. [Figure 6] Figure 6 is a flowchart showing an example of a battery manufacturing method according to Embodiment 1. [Figure 7] Figure 7 is a block diagram showing the configuration of the battery manufacturing system according to Embodiment 1. [Figure 8] Figure 8 is a schematic diagram showing the fixing process of the battery manufacturing method according to Embodiment 1. [Figure 9] Figure 9 is a schematic diagram showing the cutting step of the battery manufacturing method according to Embodiment 1. [Figure 10] Figure 10 is a schematic diagram showing the holding process of the battery manufacturing method according to Embodiment 1. [Figure 11] Figure 11 is a schematic diagram showing the polishing process of the battery manufacturing method according to Embodiment 1. [Figure 12] Figure 12 is a schematic diagram showing a first example of a process for changing the positional relationship between power generation elements in a battery manufacturing method according to Embodiment 1. [Figure 13] Figure 13 is a schematic diagram showing a second example of a process for changing the positional relationship between power generation elements in the battery manufacturing method according to Embodiment 1. [Figure 14] Figure 14 is a schematic diagram showing a third example of the process for changing the positional relationship between power generation elements in the battery manufacturing method according to Embodiment 1. [Figure 15] Figure 15 is a schematic diagram showing the coating process of the battery manufacturing method according to Embodiment 2. [Figure 16] Figure 16 is a schematic diagram showing the coating process of the battery manufacturing method according to Embodiment 2. [Figure 17A] Figure 17A is a cross-sectional view showing an example of the schematic configuration of a unit cell included in the power generation element according to each embodiment. [Figure 17B] Figure 17B is a cross-sectional view showing another example of the schematic configuration of a unit cell included in the power generation element according to each embodiment. [Figure 17C] Figure 17C is a cross-sectional view showing another example of the schematic configuration of a unit cell included in the power generation element according to each embodiment.

Best Mode for Carrying Out the Invention

[0011] (Summary of the Present Disclosure) The method for manufacturing a battery according to the first aspect of the present disclosure includes a step of fixing each of a plurality of power generation elements included in a flat plate, a step of cutting the flat plate to separately separate the plurality of power generation elements, a step of a plurality of holding units capable of changing their relative positions holding the plurality of power generation elements, a step of the plurality of holding units changing the relative positions of at least two of the plurality of power generation elements to a relative position suitable for the following process, and a step of performing the following process on at least two of the plurality of power generation elements held by the plurality of holding units.

[0012] Thereby, a battery can be manufactured with high productivity. Specifically, by cutting the flat plate in a state where a plurality of power generation elements included in the flat plate are fixed and separately separating the plurality of power generation elements, it is possible to suppress the dissipation of the power generation elements after cutting. In addition, it is possible to suppress damage to the cut surface caused by the individual power generation elements hitting each other during cutting, and to suppress a short circuit of the power generation elements.

[0013] In addition, by a plurality of holding units capable of changing their relative positions holding each of the separated plurality of power generation elements, it becomes easy to change the relative positions between the power generation elements. Specifically, the relative position suitable for the following process can be changed and / or maintained, so that the degree of freedom of the subsequent manufacturing process including the following process can be increased, and at the same time, the reliability of the process can be increased. The degree of freedom of the subsequent manufacturing process including the following process can be increased, and at the same time, the reliability of the process can be increased.

[0014] Furthermore, since the power generation elements can be held in the holding unit while the next processing is carried out, the relative positions of the power generation elements can be easily adjusted to the optimal position for the next processing. By ensuring the relative positions of the holding units, the complicated alignment of each of the multiple power generation elements is eliminated, thereby improving productivity and reducing the risk of damage to the power generation elements. Thus, the battery manufacturing method according to this embodiment can improve productivity and yield.

[0015] Furthermore, in the battery manufacturing method according to the second aspect of this disclosure, in the battery manufacturing method according to the first aspect, the fixing step is performed by a jig different from the plurality of holding units, and the holding step is performed by the plurality of holding units while the jig is fixing each of the plurality of power generation elements.

[0016] This allows for the use of mechanical clamping, such as a jig, to securely fix multiple power generation elements, thereby ensuring stable mounting of the flat plate. Furthermore, since each power generation element is held in place by multiple holding units while fixed to the jig, the possibility of dissipation and damage to the power generation elements is further reduced. As a result, productivity and yield can be further improved.

[0017] Furthermore, in the battery manufacturing method according to the third aspect of this disclosure, the fixing step is performed by the plurality of holding units in the battery manufacturing method according to the first aspect.

[0018] This allows fixing and holding to be performed with the same holding unit, further reducing the possibility of power generation element dissipation and damage. As a result, productivity and yield can be further improved.

[0019] Furthermore, in the battery manufacturing method according to the fourth aspect of this disclosure, the fixing step is performed by pressing down each of the plurality of power generation elements, in the battery manufacturing method according to any one of the first to third aspects.

[0020] This allows the power generation elements to be mechanically and firmly fixed, enabling stable cutting of the flat plate. Therefore, productivity and yield can be further improved.

[0021] Furthermore, in the battery manufacturing method according to the fifth aspect of this disclosure, the battery manufacturing method according to any one of the first to fourth aspects is performed by holding down, sandwiching, or adsorbing each of the plurality of power generation elements.

[0022] This allows the power generation element to be mechanically and firmly fixed by pressing or clamping, enabling stable cutting or post-cutting processing. Therefore, productivity and yield can be further improved. Furthermore, for example, power generation elements that were previously fixed by mechanical pressing can now be held by suction from the back, allowing for smooth transfer of power generation elements from the jig to the holding unit. This, in turn, can further improve productivity.

[0023] Furthermore, in the battery manufacturing method according to the sixth aspect of this disclosure, in the battery manufacturing method according to any one of the first to fifth aspects, the plurality of holding units can change at least one of the planar position, height, and rotation angle of the power generation element they hold.

[0024] This makes it easy to change the relative positions of the power generation elements to an appropriate state according to the content of the next process.

[0025] Furthermore, in the battery manufacturing method according to the seventh aspect of this disclosure, in the battery manufacturing method according to the sixth aspect, the plurality of holding units change at least one of the planar position, height, and rotation angle of the power generation element they hold during the period in which the following processing is performed.

[0026] This allows, for example, when polishing and / or coating is required on the end faces of all four sides of multiple rectangular flat power generation elements, the multiple power generation elements held in a holding unit can be rotated during the process to perform polishing and / or coating on all four sides. Furthermore, to avoid collisions between the power generation elements during rotation, the planar distance between them can be increased or their heights staggered before rotation. This further improves productivity and yield.

[0027] Furthermore, in the battery manufacturing method according to the eighth aspect of this disclosure, in the battery manufacturing method according to any one of the first to seventh aspects, the plurality of holding units change at least one of the planar position, height, and rotation angle of the power generation element they hold based on numerical information output from the control unit.

[0028] This allows for improved precision in controlling the relative positions of each of the multiple holding units.

[0029] Furthermore, the method for manufacturing a battery according to the ninth aspect of this disclosure is a method for manufacturing a battery according to any one of the first to eighth aspects, wherein the power generation element includes a positive electrode plate, a negative electrode plate, and an intermediate layer located between the positive electrode plate and the negative electrode plate.

[0030] This makes it easy to perform processes such as cutting and subsequent processing on a stacked structure of one or more unit cells.

[0031] Furthermore, the battery manufacturing method according to the tenth aspect of this disclosure is a battery manufacturing method according to any one of the first to ninth aspects, wherein the power generation element is a power generation element for an all-solid-state battery.

[0032] This eliminates the risk of electrolyte leakage during the manufacturing process for power generation elements in all-solid-state batteries, and facilitates processing of the end faces of the power generation elements. Therefore, it is suitable for manufacturing methods in which the power generation elements are held in a holding unit with a changeable positional relationship for cutting and end face processing. This is extremely advantageous for improving productivity and yield.

[0033] Furthermore, a battery manufacturing system according to the 11th aspect of the present disclosure includes: a cutting device that cuts a plate while each of the multiple power generation elements contained in the plate is fixed, thereby separating the multiple power generation elements individually; a plurality of holding units that hold the multiple power generation elements and whose relative positions can be changed; a control unit that controls the plurality of holding units to change the relative positions of at least two of the multiple power generation elements to a position suitable for the next processing; and a processing device that performs the next processing on at least two of the multiple power generation elements held by the plurality of holding units.

[0034] This allows for the production of batteries with high productivity, similar to the battery manufacturing method described above.

[0035] Embodiments of the present disclosure will be described below with reference to the drawings.

[0036] The embodiments described below are all general or specific examples. The numerical values, shapes, materials, components, arrangement and connection configurations of components, steps, and the order of steps shown in the following embodiments are examples only and are not intended to limit this disclosure. Furthermore, any components in the following embodiments that are not described in an independent claim will be described as optional components.

[0037] Furthermore, each figure is a schematic diagram and not necessarily a strictly accurate representation. Therefore, for example, the scale may not necessarily match in each figure. Also, in each figure, substantially identical components are given the same reference numerals, and redundant explanations are omitted or simplified.

[0038] Furthermore, in this specification, terms indicating relationships between elements such as parallelism, terms indicating the shape of elements such as rectangles, and numerical ranges do not represent only strict meanings, but also include substantially equivalent ranges, such as differences of a few percent.

[0039] Furthermore, in this specification, the terms "upper" and "lower" do not refer to the upward (vertically upward) and downward (vertically downward) directions in absolute spatial perception, but rather to terms defined by the relative positional relationship based on the stacking order in a stacked configuration. Moreover, the terms "upper" and "lower" apply not only when two components are spaced apart and another component exists between them, but also when two components are placed in close proximity and touching each other.

[0040] Furthermore, in this specification, ordinal numbers such as "first," "second," etc., do not indicate the number or order of components unless otherwise specified, but are used to avoid confusion and to distinguish similar components.

[0041] (Embodiment 1) [Flat plate containing multiple power generation elements] The battery manufacturing method according to Embodiment 1 includes the steps of: cutting a flat plate containing a plurality of power generation elements to separate the plurality of power generation elements individually; and performing the following process on the separated power generation elements. In this embodiment, the following process is polishing the end faces of the power generation elements. Multiple holding units are used to fix or hold the power generation elements in the cutting and polishing steps.

[0042] Below, we will first explain a flat plate containing multiple power generation elements, using Figures 1 and 2.

[0043] Figure 1 is a plan view of a flat plate 10 including a plurality of power generation elements 20 according to this embodiment. Figure 2 is a cross-sectional view of the flat plate 10 including a plurality of power generation elements 20 according to this embodiment. Figure 2 shows the cross-section along line II-II in Figure 1. The power generation elements 20 are power generation elements for an all-solid-state battery.

[0044] As shown in Figures 1 and 2, the flat plate 10 includes four power generation elements 20A, 20B, 20C, and 20D. In the following, when it is not necessary to distinguish between power generation elements 20A, 20B, 20C, and 20D, such as when explaining matters common to power generation elements 20A, 20B, 20C, and 20D, they will be referred to as power generation element 20.

[0045] The four power generation elements 20 are arranged in a single plane and aligned in one direction. Because the four power generation elements 20 are aligned in one direction, the power generation elements 20 can be easily separated individually by cutting between two adjacent power generation elements 20. The portion between two adjacent power generation elements 20 may be the portion removed during the cutting process.

[0046] The number of power generation elements 20 contained in the plate 10 may be 2, 3, or 5 or more. Furthermore, 3 or more power generation elements 20 may be arranged in a matrix. In this case, the power generation elements 20 can be individually separated by cutting along two orthogonal directions. Since the plate 10 is an aggregate of multiple power generation elements 20, it can also be called an aggregate plate.

[0047] As shown in Figure 2, the plate 10 has a stacked structure of multiple unit cells 100. Each of the multiple unit cells 100 includes an electrode active material layer 110, a counter electrode active material layer 120, a solid electrolyte layer 130, an electrode current collector 140, and a counter electrode current collector 150. When the plate 10 is cut and the multiple power generation elements 20 are separated individually, each of the multiple power generation elements 20 will include a stacked structure of unit cells 100.

[0048] In the example shown in Figure 2, the flat plate 10 is constructed by stacking multiple unit cells 100 in an electrically parallel-connected configuration. Specifically, two adjacent unit cells 100 in the stacking direction share an electrode current collector 140 or a counter electrode current collector 150, and the arrangement of each layer is in opposite directions.

[0049] The flat plate 10 may be stacked in a configuration in which multiple unit cells 100 are electrically connected in series. Specifically, two adjacent unit cells 100 in the stacking direction may be stacked with one electrode current collector 140 and the other counter electrode current collector 150 in direct contact or via a conductive film, and the arrangement of the remaining layers may be in the same direction. In this case, two adjacent unit cells 100 may include a so-called bipolar current collector instead of a stacked structure of electrode current collector 140 and counter electrode current collector 150. Furthermore, the power generation element 20 may include multiple unit cells 100 with a combination of parallel and series connections.

[0050] The flat plate 10 may have only one unit cell 100. In this case, if the flat plate 10 is cut and the multiple power generation elements 20 are separated individually, each of the multiple power generation elements 20 will contain only one unit cell 100. That is, each of the multiple power generation elements 20 may contain one electrode active material layer 110, one counter electrode active material layer 120, one solid electrolyte layer 130, one electrode current collector 140, and one counter electrode current collector 150.

[0051] The specific configurations of the electrode active material layer 110, the counter electrode active material layer 120, the solid electrolyte layer 130, the electrode current collector 140, and the counter electrode current collector 150 will be explained later using Figures 17A to 17C.

[0052] [Holding unit] Next, the holding unit for holding the power generation element 20 will be explained using Figures 3 to 5. The holding unit can also be used as a jig for fixing the power generation element 20 contained in the flat plate 10.

[0053] Figure 3 is a schematic diagram showing the top, side, and front views of a first example of a holding unit according to this embodiment. Specifically, Figures 3(a), (b), and (c) represent the top view, left side view, and front view of the holding unit 200, respectively.

[0054] The holding unit 200 shown in Figure 3 is a holding unit of the pressing claw type. The holding unit 200 comprises a base portion 210, a support portion 220, a pressing portion 230, and an arm portion 240. The holding unit 200 can hold the power generation element 20, which is placed on the upper surface of the support portion 220, by the pressing portion 230 pressing down on the power generation element 20. The pressing portion 230 is connected to the arm portion 240. The arm portion 240 is rotatable about a predetermined axis. As the arm portion 240 rotates, the pressing portion 230 moves, applying a pressing force to the power generation element 20, thereby fixing and holding the power generation element 20.

[0055] The support portion 220 is provided with a slit-shaped opening 221 that opens to the front. The opening 221 is configured so that the support portion of another holding unit can be inserted into it. This allows for easy transfer of the power generation element 20 from one holding unit 200 to another. A specific example will be described later.

[0056] The support portion 220 may also be connected to an arm portion, and the power generation element 20 may be clamped by the movement of both the support portion 220 and the pressing portion 230. In other words, the holding unit 200 may be a clamping type holding unit. Furthermore, at least one of the support portion 220 and the pressing portion 230 may be configured to press down on or clamp the power generation element 20 by sliding in the vertical direction rather than rotating around an axis.

[0057] Figure 4 is a schematic diagram showing the top, side, and front views of a second example of the holding unit according to this embodiment. Specifically, Figures 4(a), 4(b), and 4(c) represent the top view, left side view, and front view of the holding unit 300, respectively. Note that in Figures 4(b) and 4(c), only the support portion 320, the ventilation portion 330, and the sealing portion 340 are shown in cross-sections passing approximately through their respective centers.

[0058] The holding unit 300 shown in Figure 4 is a vacuum suction type holding unit. The holding unit 300 comprises a base portion 310, a support portion 320, a ventilation portion 330, and a sealing portion 340. The support portion 320 is provided with a hollow space 321 with an open top. One end of the ventilation portion 330 communicates with the space 321, and the other end is connected to an intake device (not shown), such as a vacuum pump. By drawing gas from the space 321 through the ventilation portion 330, the holding unit 300 can fix and hold the power generation element 20 placed on the upper surface of the support portion 320.

[0059] The sealing portion 340 is an elastic member such as an O-ring and is provided along the perimeter of the opening on the upper side of the space 321. The sealing portion 340 prevents gas from leaking out from the gap between the power generation element 20 and the support portion 320. This increases the holding force of the power generation element 20 by the holding unit 300.

[0060] Figure 5 is a schematic diagram showing the top, side, and front views of a third example of the holding unit according to this embodiment. Specifically, Figures 5(a), (b), and (c) represent the top view, left side view, and front view of the holding unit 400, respectively. Note that in Figures 5(b) and (c), only the support portion 420, the ventilation portion 430, and the porous adsorption member 440 are shown in cross-sections passing approximately through the center of each portion.

[0061] The holding unit 400 shown in Figure 5 is a holding unit of the porous adsorption plate type. The holding unit 400 comprises a base portion 410, a support portion 420, a ventilation portion 430, and a porous adsorption member 440. The support portion 420 is provided with a space similar to the support portion 320 of the holding unit 300 in Figure 4, and the porous adsorption member 440 is filled in this space. The porous adsorption member 440 is, for example, ceramic, but is not particularly limited.

[0062] The ventilation section 430 is connected at one end to the porous adsorption member 440 and at the other end to an intake device (not shown), such as a vacuum pump. The intake device draws gas from within the pores of the porous adsorption member 440 through the ventilation section 430, allowing the holding unit 400 to fix and hold the power generation element 20 placed on the upper surface of the porous adsorption member 440.

[0063] As described above, the holding unit may be, for example, a holding unit 200 of the pressing claw type or clamping type as schematically shown in Figure 3, or a vacuum suction type as schematically shown in Figure 4. A holding unit 300 or a holding unit 400 such as a porous adsorption plate type schematically shown in Figure 5 can be used. Furthermore, the holding unit is not limited to the illustrated example, but other types and combinations thereof can be used, and the method of holding the power generation element 20 in this disclosure is not limited to the illustrated method. For example, vacuum adsorption or porous adsorption may be applied to the upper surface of the power generation element 20. Alternatively, if there is no risk of damage, the power generation element 20 may be held by clamping its sides.

[0064] [Battery manufacturing method] Next, the method for manufacturing the battery according to this embodiment will be explained with reference to Figures 6 to 10.

[0065] First, an overview of the battery manufacturing method will be explained using Figure 6. Figure 6 is a flowchart showing an example of a battery manufacturing method according to this embodiment.

[0066] As shown in Figure 6, first, a flat plate 10 containing multiple power generation elements 20 is prepared (S10, preparation step). Next, each of the multiple power generation elements 20 contained in the flat plate 10 is fixed (S12, fixing step). Next, the multiple power generation elements 20 are separated individually by cutting the flat plate 10 (S14, cutting step). Next, the separated multiple power generation elements 20 are held by multiple holding units whose relative positions can be changed (S16, holding step). Next, the multiple holding units change the relative positions of at least two of the multiple power generation elements 20 so that they are in a position suitable for the next process (S18, position change step). Next, the following process is performed on at least two of the multiple power generation elements 20 held by the multiple holding units (S20, next processing step).

[0067] By following the above steps, batteries can be manufactured with high productivity and high yield. However, the battery manufacturing method described herein is not limited to the above example. For example, the fixing step and the holding step may be performed substantially simultaneously.

[0068] Next, the main steps of the manufacturing method shown in Figure 6 will be explained in detail using the diagram. The manufacturing method shown in Figure 6 is carried out, for example, by manufacturing system 1 shown in Figure 7.

[0069] Figure 7 is a block diagram showing the configuration of the battery manufacturing system 1 according to this embodiment. As shown in Figure 7, the manufacturing system 1 comprises a plurality of holding units 200 and 300, a cutting device 500, a polishing device 600, and a control unit 800.

[0070] Holding units 200 and 300 are the holding units shown in Figures 3 and 4, respectively. Manufacturing system 1 may also include holding unit 400, shown in Figure 5, instead of holding unit 200 or 300. Furthermore, all holding units in manufacturing system 1 may be of the same type.

[0071] The following describes an example of manufacturing a battery from the flat plate 10 shown in Figures 1 and 2. Since the flat plate 10 contains four power generation elements 20, four batteries can be manufactured. To fix and hold the four power generation elements 20, the manufacturing system 1 includes four holding units 200 and four holding units 300.

[0072] Figure 8 is a schematic diagram showing the fixing step (S12) of the battery manufacturing method according to this embodiment. Figures 8(a) and 8(b) are a top view and a side view, respectively, of the multiple holding units 200 and the cutting device 500 of the manufacturing system 1.

[0073] As shown in Figure 8, the flat plate 10 is fixed by being held down by multiple holding units 200 before being cut and separated into individual power generation elements 20 by the cutting device 500. Specifically, Each of the four holding units 200 secures the four power generation elements 20 contained in the flat plate 10 by pressing them down on a one-to-one basis.

[0074] Figure 9 is a schematic diagram showing the cutting step (S14) of the battery manufacturing method according to this embodiment. Figures 9(a) and 9(b) are top and side views, respectively, of the multiple holding units 200 and the cutting device 500 of the manufacturing system 1.

[0075] The cutting device 500 shown in Figures 8 and 9 is a rotary blade type cutting device. The cutting device 500 comprises a plurality of cutting blades 510 and a shaft portion 520. The plurality of cutting blades 510 are rotatable around the shaft portion 520 and are arranged at predetermined intervals from each other. The spacing between adjacent cutting blades 510 is set depending on the size of the power generation element 20.

[0076] As shown in Figures 8 and 9, the cutting device 500 moves from the right side to the left side of the multiple holding units 200 in the figures. This allows the flat plate 10 to be cut simultaneously at three locations, separating the four power generation elements 20 individually. Alternatively, the cutting device 500 may be fixed in place while the multiple holding units 200 move.

[0077] The cutting device 500 is not limited to a rotary blade system, but may also be a system in which the cutting blade moves in the vertical direction (stack direction), the horizontal direction (direction parallel to the main surface of the power generation element), or in an oblique direction. Furthermore, the cutting device 500 may be a device capable of cutting while vibrating, such as ultrasonic vibration. In addition, the cutting device 500 is not limited to mechanical cutting, but may be a cutting device utilizing gas or a laser.

[0078] As shown in Figure 9, all of the power generation elements 20 before and after cutting are held by the corresponding holding units 200. Therefore, when the flat plate 10 is separated into multiple power generation elements 20, each power generation element 20 does not scatter and is held by the holding units 200. In other words, the relative positional relationship of the multiple power generation elements 20 is maintained before and after cutting, so damage to the power generation elements 20 due to collisions between adjacent power generation elements 20 can be suppressed.

[0079] After being separated into multiple power generation elements 20, steps may be taken to remove cutting dust, for example, by electrostatic discharge and blowing or suction. Each separated power generation element 20 is transferred from holding unit 200 to holding unit 300, as shown in Figures 9 to 10.

[0080] Figure 10 is a schematic diagram showing the holding step (S16) of the battery manufacturing method according to this embodiment. Figures 10(a) and (b) are top and side views, respectively, of the multiple holding units 200 and 300 of the manufacturing system 1.

[0081] First, as shown in Figure 9, the power generation element 20 is fixed to the holding unit 200 and held by the holding unit 300 by vacuum suction. Specifically, the support portion 320 of the holding unit 300 is inserted into the opening 221 of the support portion 220 of the holding unit 200, and the seal portion 340 is brought into contact with the lower surface of the power generation element 20. After sealing the space 321 between the power generation element 20 and the support portion 320 of the holding unit 300 with the seal portion 340, the gas in the space 321 is sucked out through the ventilation portion 330 via an intake device (not shown). By doing so, the space 321 is reduced in pressure, allowing the power generation element 20 to be attracted to the support portion 320, so that the holding unit 300 can hold the power generation element 20.

[0082] After the holding unit 300 has held the power generation element 20, the fixing by the holding unit 200 is released. Specifically, as shown in Figure 10, the arm portion 240 is rotated to pull the pressing portion 230 away from the support portion 220. This releases the power generation element 20 from being held by the holding unit 300. The state can be maintained. By sliding the holding unit 200 or 300 and pulling the support part 320 out of the opening 221, the power generation element 20 can be separated from the holding unit 200.

[0083] Thus, the control of the positional relationship between the power generation elements 20 after cutting is taken over from the holding unit 200 to the holding unit 300. By using the holding unit 200 with a clamping claw type during cutting and then taking over the holding method to the holding unit 300 with an adsorption type, it is possible to suppress the adhesion of cutting dust to the adsorption type holding unit 300 and the resulting decrease in adsorption performance. Note that the method of changing the control of the positional relationship between each power generation element 20 between processes is not limited to the example described above.

[0084] The multiple power generation elements 20, whose relative positions are maintained by the holding unit 200, move on to the next processing step. The next processing step is, for example, cleaning the end faces of the power generation elements 20. Specifically, the end faces (specifically the cut surfaces) of the power generation elements 20 are polished and cleaned.

[0085] Figure 11 is a schematic diagram showing the polishing step (S20) of the battery manufacturing method according to this embodiment. Figure 11(a) and (b) are a top view and a side view, respectively, of the multiple holding units 300 and the polishing device 600 of the manufacturing system 1.

[0086] The polishing device 600 is a rotary polishing device. The polishing device 600 comprises a plurality of grinding wheels 610 and a shaft portion 620. The plurality of grinding wheels 610 are rotatable around the shaft portion 620 and are arranged at predetermined intervals from each other. When the rotating grinding wheels 610 lightly touch the end face of the power generation element 20, the end face of the power generation element 20 is polished. This removes burrs and irregularities on the cut surface generated by the cutting device 500 in the previous process. At this time, the contact sliding direction between the grinding wheel 610 and the power generation element 20 is made as parallel as possible to the main surface of the power generation element 20. This suppresses delamination of the power generation element 20.

[0087] During end face polishing, the rotating grinding wheel 610 is inserted between the end faces of two adjacent power generation elements 20. This allows for efficient polishing of the end faces of the power generation elements 20. Furthermore, because the small stress application points on the power generation elements 20 during polishing are located at each end face of the two power generation elements 20, the risk of misalignment of the power generation elements 20 can be reduced. This suppresses excessive or insufficient polishing, thereby increasing yield.

[0088] Furthermore, in order to insert the rotating grinding wheel 610 between the end faces of two adjacent power generation elements 20 during end face polishing, the distance between the two adjacent power generation elements must be adjusted. Specifically, the relative positions of the two power generation elements 20 are changed by changing the relative positions of the two holding units 300 that hold the two power generation elements 20. The change in relative positions is performed in the position change step (S18) shown in Figure 6. Alternatively, the change in relative positions may be performed during the polishing process. The specific process will be explained later.

[0089] Furthermore, polishing may be performed on each of the four sides of the power generation element 20, which has a rectangular shape in plan view. In this case, the holding unit 300 can rotate the power generation element 20 to adjust the positional relationship between the end face to be polished and the grinding wheel 610. An example of rotating the power generation element 20 will be explained later.

[0090] Furthermore, the polishing device 600 is not limited to a rotary type, and the grinding wheel 610 may move in the vertical direction (stacking direction), the horizontal direction (direction parallel to the main surface of the power generation element), or diagonally. The movement of the grinding wheel 610 may be unidirectional, or it may be one or more reciprocating movements. The grinding wheel 610 may also vibrate.

[0091] Furthermore, the abrasive powder on the end face polished by the grinding wheel 610 can be removed by a cleaning process. The method of removal is not particularly limited, but for example, one efficient method is to wipe the end face located at a 90-degree angle to the polished surface using a non-woven fabric or the like.

[0092] The power generation element 20, whose end faces are polished, is enclosed in a container made of laminated film arranged on its upper and lower surfaces, for example, and the laminated films on the upper and lower surfaces of the power generation element 20 are heat-fused together in a heat-fusion region around the power generation element 20. At this time, lead members for taking out the positive and negative electrodes can be connected to the main surfaces of the electrode current collector 140 and the counter electrode current collector 150 and guided to the outside of the laminated film through the heat-fusion region. This allows the power generation element 20 to be charged and discharged from the outside of the laminated film.

[0093] As described above, a battery can be manufactured comprising a power generation element 20, a laminate film for sealing the power generation element 20, a lead member for the positive electrode, and a lead member for the negative electrode. Note that the battery does not necessarily have to include the laminate film and lead members. Furthermore, an insulating coating may be formed on the end face of the power generation element 20 before sealing it with the laminate film. The process for forming the coating will be described in Embodiment 2.

[0094] [Change the relative positions] Next, the process of changing the position of the multiple power generation elements 20 (S18) will be explained.

[0095] The relative positions of the multiple power generation elements 20 are changed by the holding units 300 that hold the power generation elements 20. The relative positions of the multiple holding units 300 can be changed. As a way to change the relative positions of the holding units 300, for example, their relative positions are mechanically restricted by a sliding mechanism, a link mechanism and / or a gear mechanism connected to each of the multiple base portions 310.

[0096] Alternatively, each of the multiple holding units 300 may have its own individual drive mechanism. For example, each of the multiple holding units 300 comprises a control unit such as a microcontroller and a drive unit such as a motor that is driven based on a control signal transmitted from the control unit. By coordinating the control signals of each of the multiple holding units 300, the relative positions of the holding units 300 can be changed. The method for changing and controlling the relative positions of the holding units 300 is not limited to these means. Although the holding unit 300 has been used as an example here, the relative positions of the holding units 200 and 400 can also be changed in the same way.

[0097] The multiple holding units 300 are controlled, for example, by the control unit 800 shown in Figure 7. The control unit 800 is implemented, for example, by an integrated circuit (IC), specifically an LSI (Large Scale Integration). Note that the integrated circuit is not limited to an LSI; it may also be a dedicated circuit or a general-purpose processor. For example, the control unit 800 may be a microcontroller.

[0098] The control unit 800 includes, for example, a non-volatile memory where the program is stored, input / output ports, and a processor that executes the program. The control unit 800 may also be a programmable FPGA (Field Programmable Gate Array) or a reconfigurable processor in which the connections and settings of circuit cells within the LSI can be reconfigured. The functions performed by the control unit 800 may be implemented in software or in hardware.

[0099] For example, the control unit 800 outputs numerical information to each of the multiple holding units 300. The numerical information indicates the amount of change in the position of each corresponding holding unit 300. Alternatively, the numerical information may be three-dimensional coordinates representing the position of the corresponding holding unit 300 in three-dimensional space. Upon receiving the numerical information, the microcontroller of the holding unit 300 moves the holding unit 300 by outputting a control signal to the drive unit based on the numerical information.

[0100] Multiple holding units 300 can change at least one of the planar position, height, and rotation angle of the power generation element 20 they hold. Specifically, the positional relationship of the power generation element 20 is changed by moving or rotating the entire holding unit 300 in the planar direction or in the height direction. The base portion 310 of the holding unit 300 may be fixed, and the support portion 320 may move or rotate in the planar direction or in the height direction. As long as the positional relationship between the multiple power generation elements 20 can be changed, the specific configuration of the multiple holding units 300 is not particularly limited. The planar direction is the direction parallel to the main surface of the flat power generation element 20. The height direction is the direction perpendicular to the main surface of the flat power generation element 20.

[0101] Figures 12 to 14 are schematic diagrams showing the first to third examples of the process for changing the positional relationship between the power generation elements 20 in the battery manufacturing method according to this embodiment. In each figure, (a) and (b) are the top view and front view of the power generation elements 20 and the holding unit 300 before the change in positional relationship, respectively. (c) and (d) are the top view and front view of the power generation elements 20 and the holding unit 300 after the change in positional relationship, respectively. In Figures 12 to 14, the power generation elements are labeled with reference numerals "20A" to "20D" to clarify the positional relationship of the power generation elements 20. The reference numeral "20" is omitted to avoid making the drawings complex.

[0102] As shown in Figure 12, the multiple holding units 300 are movable in the planar direction. Therefore, the distance between adjacent power generation elements 20 separated from the flat plate 10 can be uniformly changed from distance d1 to distance d2. This allows the distance between adjacent power generation elements 20 to be changed all at once to a distance suitable for the next process (specifically, polishing). By changing the distance all at once, the position of multiple power generation elements 20 can be changed simply, quickly, and reliably.

[0103] Note that Figure 12 shows an example in which multiple holding units 300 widen the distance between adjacent power generation elements 20 from distance d1 to distance d2 (>d1), but the system is not limited to this. Multiple holding units 300 may also narrow the distance between adjacent power generation elements 20. Furthermore, the distance between power generation elements 20 does not have to be uniform.

[0104] Furthermore, as shown in Figure 13, the multiple holding units 300 are movable in the height direction. Therefore, the height relationship between adjacent power generation elements 20 separated from the flat plate 10 can be changed simultaneously according to a certain rule. Having a controlled degree of freedom in the positional relationship in the height direction allows for a more compact design of the process equipment. For example, as shown in Figures 13 and 14, the power generation elements 20 are moved so that the heights of adjacent power generation elements 20 are staggered. When rotating multiple power generation elements 20 simultaneously, collisions between the power generation elements 20 can be suppressed. This allows for a more compact design of the process equipment compared to cases where a large distance is secured in the planar direction. As a result, for example, a significant cost reduction is possible in processes that handle a large number of power generation elements 20.

[0105] Note that Figure 13 shows an example where, in the direction of arrangement of the power generation elements 20, all odd-numbered power generation elements 20 have the same height, all even-numbered power generation elements 20 have the same height, and odd-numbered and even-numbered elements have different heights, but this is not limited to this. Multiple holding units 300 can also cause all of the multiple power generation elements 20 to have different heights from each other. As shown in Figure 14. The rotation angles may also be different for all power generation elements 20.

[0106] As described above, the positional relationship of the holding unit 300 that holds multiple power generation elements 20 is adjustable. Therefore, when performing the polishing shown in Figure 11, first, as shown in Figure 12, move the power generation elements 20 to widen the spacing between them immediately after separation. Then, with the distance between adjacent power generation elements 20 slightly increased, insert the grinding wheel 610 between the end faces of two power generation elements 20, and then bring the distance between the power generation elements 20 closer until the end faces of the power generation elements 20 slightly touch the grinding wheel 610. This allows the finish polishing of the end faces of the power generation elements 20 to begin.

[0107] Next, by sliding the polishing device 600 or the holding unit 300, the entire two opposing end faces of the power generation element 20 can be polished simultaneously. Furthermore, as polishing progresses, the distance between the multiple grinding wheels 610 of the polishing device 600 and the distance between the multiple power generation elements 20 can be slightly reduced. This allows for high-quality polishing of the end faces of two power generation elements 20 simultaneously.

[0108] Furthermore, for example, if the power generation element 20 is rectangular in shape, after inserting a grinding wheel 610 between adjacent power generation elements 20 and performing polishing, the multiple holding units 300 alternately shift the height at which they hold the power generation elements 20, as shown in Figure 13, and then rotate the power generation elements 20 by 90 degrees. After that, the spacing between the holding units 300 is adjusted, and the holding heights of the power generation elements 20 are aligned again. Then, by inserting the grinding wheel 610 between the power generation elements 20 again and polishing, all four sides of the rectangular power generation element 20 can be polished.

[0109] (Embodiment 2) Next, Embodiment 2 will be described.

[0110] In Embodiment 2, the process following the cutting process differs from that in Embodiment 1. Specifically, as the process following the cutting process, an insulating coating is formed on the end face.

[0111] To improve the reliability of the power generation element 20, it is sometimes effective to form an insulating layer on the cut end surface. According to the battery manufacturing method of this embodiment, it is possible to apply an insulating coating to the end surface of the power generation element 20. In particular, when the plan view shape of the power generation element 20 is rectangular, there are four end surfaces, so it is very important to perform the coating efficiently.

[0112] In the following, we will focus on explaining the differences from Embodiment 1, and omit or simplify the explanation of the common points. Specifically, the processes from the preparation step (S10) to the position change step (S18) shown in Figure 6 are the same as in Embodiment 1, so we will explain the next processing step (S20).

[0113] Figures 15 and 16 are schematic diagrams showing the coating process of the battery manufacturing method according to Embodiment 2, respectively. Figures 15 and 16 (a) and (b) respectively are top and side views of the multiple holding units 300 and the coating apparatus 700.

[0114] For the multiple power generation elements 20 held by the holding unit 300, the next processing step (S20) is a coating step on the end faces. As the coating material, for example, a coating liquid made of an insulating material to suppress short circuits of the power generation elements 20 is used. By applying the coating liquid to the end faces of the power generation elements 20 and curing it, an insulating layer can be formed on the end faces of the power generation elements 20.

[0115] In the coating process, the multiple holding units 300 adjust the positional relationship between the power generation elements 20 so that the end faces of each power generation element 20 face each other and are close together. The distance between elements 20 is, for example, 0.05 mm or more, but may be 0.1 mm or more. Also, the distance between adjacent power generation elements 20 is, for example, 2 mm or less, but may be 1 mm or less. Note that the distance between adjacent power generation elements 20 is not limited to this numerical range, and an appropriate distance range can be selected depending on the characteristics of the coating liquid used for end-face coating, specifically its viscosity.

[0116] In the coating process, as shown in Figure 15, the coating liquid 30 is applied to the area where the end faces of adjacent power generation elements 20 are close together. The area where the end faces are close together refers to the portion that includes the mutually opposing end faces of two adjacent power generation elements 20 and the gap between them in a plan view. The method of applying the coating liquid 30 can be, for example, inkjet coating, dispenser coating, or screen coating. The method of applying the coating liquid 30 is not limited to these methods.

[0117] Furthermore, when the end faces are close together, they are not in close contact, that is, they are not in complete contact. In other words, "close together" means that while parts of the two end faces may be in contact, there is at least a gap large enough for the coating liquid 30 to penetrate. For example, the end faces are not in contact at all, and the distance between them is greater than zero. Note that when the distance between the end faces is changed, the end faces may be in close contact at the time the coating liquid 30 is applied from the coating device 700.

[0118] The coating liquid 30 is formed using, for example, an insulating material. Specifically, the coating liquid 30 includes an insulating resin. The insulating resin is, for example, an epoxy resin, but is not limited to this. Usable insulating materials are selected based on various properties such as flexibility, gas barrier properties, impact resistance, and heat resistance.

[0119] Multiple holding units 300 reduce the gap between two adjacent power generation elements 20, allowing the applied coating liquid 30 to penetrate the gap between the power generation elements 20 even when the direction of application of the coating liquid 30 from the coating apparatus 700 is nearly perpendicular to the main surface of the power generation elements 20, as shown in (b) of Figures 15 and 16. As a result, an insulating layer, which is a coating layer, can be formed on the end faces of the power generation elements 20. The direction of application of the coating liquid 30 is centered on the direction perpendicular to the main surface of the power generation elements 20, for example, within a range of -45 degrees to +45 degrees. For the purpose of miniaturizing the equipment, it may also be within a range of -15 degrees to +15 degrees.

[0120] To further homogenize the coating on the end faces of the power generation elements 20, adjacent power generation elements 20 may be moved relative to each other. Specifically, by changing the distance between the end faces of adjacent power generation elements 20 while the coating liquid 30 is applied near the gap between adjacent power generation elements 20, the coating liquid 30 can be applied to the end faces of the power generation elements 20 more quickly. The change in distance can be by bringing them closer together, moving them further apart, or repeating these actions. Alternatively, the power generation elements 20 may be slid along the end faces of adjacent power generation elements 20. This allows the coating liquid 30 to be applied more uniformly to the end faces of the power generation elements 20. In this case, by performing the sliding in a direction parallel to the main surface of the power generation element 20, deformation and peeling of the power generation element 20 can be suppressed. The direction of the sliding may be perpendicular to the main surface of the power generation element 20, or it may be oblique.

[0121] Furthermore, if the power generation element 20 is in the shape of a rectangular flat plate, for example, after applying the coating liquid 30 to the end faces of adjacent power generation elements 20, the multiple holding units 300 may, for example, alternately shift the height at which they hold the power generation elements 20. Then, the holding units 300 rotate the power generation elements 20 by 90 degrees to adjust the distance between the power generation elements 20 and align the holding heights of the power generation elements 20 again. Then, by applying the coating liquid 30 to the end faces of the power generation elements 20 again, the coating liquid 30 can be applied to each of the four end faces of the power generation elements 20.

[0122] After applying the coating liquid 30 to the end faces of the power generation elements 20, the distance between the power generation elements 20 held by the holding unit 300 is increased, causing the coating liquid 30 that filled the gaps to separate and a coating film to be formed on each end face of the power generation elements 20. During separation, the coating film can sometimes be made more uniform by allowing the two adjacent power generation elements to move relative to each other. The specific conditions for separating the two adjacent power generation elements 20 are appropriately determined based on the characteristics of the power generation elements 20 and the coating liquid 30.

[0123] For the power generation element 20 on which a coating film has been formed on its end face, drying and / or curing of the coating film is performed as necessary. As a curing method, for example, heat curing or ultraviolet curing can be used.

[0124] In this embodiment, an example is shown in which the holding unit 300 holds the power generation element 20, but the embodiment is not limited to this. The power generation element 20 may be held by the holding unit 200 shown in Figure 3, the holding unit 400 shown in Figure 5, or other holding units.

[0125] [Unit cell] Next, we will describe the specific configuration of each layer of the unit cell 100 that the power generation element 20 described in each of the embodiments above contains.

[0126] Figures 17A to 17C are cross-sectional views showing examples of the schematic configuration of a unit cell 100 included in the power generation element 20 according to each embodiment. As shown in Figure 17A, the unit cell 100 includes an electrode active material layer 110, a counter electrode active material layer 120, a solid electrolyte layer 130, an electrode current collector 140, and a counter electrode current collector 150. The electrode active material layer 110 and the counter electrode active material layer 120 face each other via the solid electrolyte layer 130.

[0127] The laminated structure of the electrode current collector 140 and the electrode active material layer 110 is an example of a negative electrode plate. The laminated structure of the counter electrode current collector 150 and the counter electrode active material layer 120 is an example of a positive electrode plate. The solid electrolyte layer 130 is an example of an intermediate layer located between the positive electrode plate and the negative electrode plate. Note that, as shown in Figures 17B and 17C, the unit cell 100 does not necessarily include at least one of the electrode current collector 140 and the counter electrode current collector 150. In other words, the negative electrode plate may consist only of the electrode active material layer 110, and the positive electrode plate may consist only of the counter electrode active material layer 120.

[0128] The electrode active material layer 110 is, for example, a layer containing a negative electrode material as an electrode material. For example, the electrode active material layer 110 contains a negative electrode active material. As the negative electrode active material contained in the electrode active material layer 110, for example, graphite, metallic lithium, etc., can be used. As the material for the negative electrode active material, various materials that can release and insert ions such as lithium (Li) or magnesium (Mg) can be used.

[0129] Furthermore, as the material containing the electrode active material layer 110, a solid electrolyte such as an inorganic solid electrolyte may be used. As an inorganic solid electrolyte, for example, a sulfide solid electrolyte or an oxide solid electrolyte may be used. As a sulfide solid electrolyte, for example, a mixture of lithium sulfide (Li2S) and phosphorus pentasulfide (P2S5) may be used. In addition, as the material containing the electrode active material layer 110, a conductive material such as acetylene black, or a binding binder such as polyvinylidene fluoride may be used.

[0130] The electrode active material layer 110 can be manufactured by coating the surface of the electrode current collector 140 with a paste-like coating made by kneading the materials containing the electrode active material layer 110 together with a solvent, and then drying the coating. To increase the density of the electrode active material layer 110, the electrode plate containing the electrode active material layer 110 and the electrode current collector 140 may be pressed after drying. The thickness of the electrode active material layer 110 is, for example, 5 μm to 300 μm, but is not limited to this.

[0131] The counter electrode active material layer 120 is, for example, a layer containing a positive electrode material as an electrode material. The positive electrode material is the material that constitutes the counter electrode of the negative electrode material. For example, the counter electrode active material layer 120 contains a positive electrode active material. Possible positive electrode active materials to be contained in the counter electrode active material layer 120 include, for example, lithium cobalt oxide composite oxide (LCO), lithium nickel oxide composite oxide (LNO), lithium manganese oxide composite oxide (LMO), lithium-manganese-nickel composite oxide (LMNO), lithium-manganese-cobalt composite oxide (LMCO), lithium-nickel-cobalt composite oxide (LNCO), and lithium-nickel-manganese-cobalt composite oxide (LNMCO). Various materials that can release and insert ions such as Li or Mg can be used as the material for the positive electrode active material.

[0132] Furthermore, as the material containing the counter electrode active material layer 120, a solid electrolyte such as an inorganic solid electrolyte may be used. As the inorganic solid electrolyte, sulfide solid electrolytes or oxide solid electrolytes may be used. As the sulfide solid electrolyte, for example, a mixture of Li2S and P2S5 may be used. The surface of the positive electrode active material may be coated with a solid electrolyte. Furthermore, as the material containing the counter electrode active material layer 120, a conductive material such as acetylene black, or a binding binder such as polyvinylidene fluoride may be used.

[0133] The counter electrode active material layer 120 can be manufactured by coating the surface of the counter electrode current collector 150 with a paste-like coating made by kneading the materials containing the counter electrode active material layer 120 together with a solvent, and then drying the coating. To increase the density of the counter electrode active material layer 120, the counter electrode plate containing the counter electrode active material layer 120 and the counter electrode current collector 150 may be pressed after drying. The thickness of the counter electrode active material layer 120 is, for example, 5 μm to 300 μm, but is not limited to this.

[0134] The solid electrolyte layer 130 is placed between the electrode active material layer 110 and the counter electrode active material layer 120. The solid electrolyte layer 130 is in contact with both the electrode active material layer 110 and the counter electrode active material layer 120. The solid electrolyte layer 130 is a layer containing an electrolyte material. As the electrolyte material, a generally known solid electrolyte for batteries can be used. The thickness of the solid electrolyte layer 130 may be 5 μm or more and 300 μm or less, or 5 μm or more and 100 μm or less.

[0135] As the solid electrolyte, for example, an inorganic solid electrolyte may be used. As the inorganic solid electrolyte, sulfide solid electrolytes or oxide solid electrolytes may be used. As the sulfide solid electrolyte, for example, a mixture of Li2S and P2S5 may be used. In addition to the electrolyte material, the solid electrolyte layer 130 may also contain a binding binder such as polyvinylidene fluoride.

[0136] The electrode current collector 140 and the counter electrode current collector 150 are each conductive foil-shaped, plate-shaped, or mesh-shaped members. The electrode current collector 140 and the counter electrode current collector 150 may each be, for example, a conductive thin film. As materials for constituting the electrode current collector 140 and the counter electrode current collector 150, metals such as stainless steel (SUS), aluminum (Al), copper (Cu), and nickel (Ni) may be used. The electrode current collector 140 and the counter electrode current collector 150 may be formed using different materials.

[0137] The thickness of the electrode current collector 140 and the counter electrode current collector 150 is, for example, 5 μm to 100 μm, but is not limited thereto. The main surface of the electrode current collector 140 is in contact with the electrode active material layer 110. The electrode current collector 140 may also include a current collector layer containing a conductive material, which is provided in the portion that is in contact with the electrode active material layer 110. The main surface of the counter electrode current collector 150 is in contact with the counter electrode active material layer 120. The counter electrode current collector 150 is in contact with the counter electrode active material layer 120. The contact portion may include a current collector layer which is a layer containing a conductive material.

[0138] In the power generation element 20, the electrode active material layer 110, the counter electrode active material layer 120, the solid electrolyte layer 130, the electrode current collector 140, and the counter electrode current collector 150 are maintained in a parallel plate shape. This suppresses the occurrence of cracks or collapse due to bending. Alternatively, the electrode active material layer 110, the counter electrode active material layer 120, the solid electrolyte layer 130, the electrode current collector 140, and the counter electrode current collector 150 may be smoothly curved together.

[0139] As shown in Figure 17A, the unit cell 100 includes one electrode current collector 140 and one counter electrode current collector 150, but is not limited to this. As shown in unit cell 100B in Figure 17B, the unit cell 100 does not need to include the counter electrode current collector 150. Alternatively, as shown in unit cell 100C in Figure 17C, the unit cell 100 does not need to include the electrode current collector 140.

[0140] For example, the power generation elements shown in Figures 1 and 2 are formed by stacking unit cells 100A, 100B, or 100C shown in Figures 17A to 17C in appropriate combinations. Depending on the combination, adjacent electrode current collectors 140 may be stacked together, adjacent counter electrode current collectors 150 may be stacked together, or two adjacent electrode current collectors 140 and two counter electrode current collectors 150 may be stacked together. Two stacked current collectors may be joined together, for example, via a conductive material or adhesive material.

[0141] (Other embodiments) Although a battery manufacturing method and battery manufacturing system according to one or more embodiments have been described above based on embodiments, this disclosure is not limited to these embodiments. Within the scope of this disclosure, various modifications to these embodiments that a person skilled in the art could conceive, as well as configurations constructed by combining components from different embodiments, are also included, as long as they do not depart from the spirit of this disclosure.

[0142] For example, while each embodiment shows an example in which the power generation element includes a battery cell, it is not limited to this. The power generation element may include only a portion related to at least one of the positive electrode and the negative electrode. Specifically, the power generation element may be a positive electrode plate or a negative electrode plate. The positive electrode plate is a flat plate that includes a positive electrode current collector and a positive electrode active material layer, but does not include a negative electrode current collector and a negative electrode active material layer. The negative electrode plate is a flat plate that includes a negative electrode current collector and a negative electrode active material layer, but does not include a positive electrode current collector and a positive electrode active material layer. Both the positive electrode plate and the negative electrode plate may include a solid electrolyte layer.

[0143] Furthermore, while each embodiment shows an example in which the power generation element includes a solid electrolyte layer as an intermediate layer, it is not limited to this. The power generation element may include a separator as an intermediate layer and may include an electrolyte instead of a solid electrolyte. In other words, the power generation element is not limited to a power generation element for an all-solid-state battery.

[0144] Furthermore, each of the multiple power generation elements fixed before the plate is cut does not have to be the smallest size battery element. The smallest size battery element means a power generation element equivalent in size to the battery that will ultimately be manufactured. In other words, each of the multiple power generation elements fixed before the plate is cut may include two or more smallest size battery elements.

[0145] For example, consider a flat plate in which eight minimum-sized battery elements are arranged in a two-dimensional 4x2 grid. By cutting this flat plate in three places, it may be separated into four power generation elements, each containing two minimum-sized battery elements. The four power generation elements correspond to each row of the flat plate before cutting. Subsequently, by cutting each of the four power generation elements, they may be separated into two minimum-sized battery elements. In this way, when cutting the flat plate multiple times, the cutting process in stages prior to the final cut... In this regard, the battery manufacturing method and manufacturing system described herein may be applied.

[0146] Furthermore, while each embodiment describes an example in which the fixing of multiple power generation elements contained in a flat plate and the holding of multiple power generation elements during the next processing are performed by different holding units, the invention is not limited to this. For example, the holding units that hold the power generation elements contained in the flat plate may change their relative positions to hold the power generation elements during the next processing. This reduces the number of units that hold the power generation elements, thereby enabling a compact manufacturing system.

[0147] Furthermore, while each embodiment shows an example in which the following processing is performed on all power generation elements separated from the flat plate, it is not limited to this. For example, the following processing may be performed on only two of the multiple power generation elements separated from the flat plate. In this case, the positional relationship change processing performed by the holding unit may also be performed only on those two power generation elements.

[0148] Furthermore, while each embodiment shows an example where the power generation element is a rectangular flat plate, it is not limited to this. For example, the planar shape of the power generation element may be a polygon other than a rectangle, such as a circle or an ellipse. Also, the shape of the power generation element may be a curved plate.

[0149] Furthermore, each of the above embodiments can be modified, replaced, added, or omitted in various ways within the scope of the claims or their equivalents. [Industrial applicability]

[0150] The battery manufacturing method and battery manufacturing system described herein can be used as a battery manufacturing method and battery manufacturing system for electronic devices, electrical appliances, electric vehicles, and the like. [Explanation of Symbols]

[0151] 1. Manufacturing System 10 flat plate 20, 20A, 20B, 20C, 20D power generation elements 30 Coating liquid 100, 100A, 100B, 100C unit cells 110 Electrode active material layer 120 Counter electrode active material layer 130 Solid electrolyte layer 140 Electrode current collector 150 Counter-pole current collector 200, 300, 400 holding units 210, 310, 410 Base section 220, 320, 420 Support part 221 Opening 230 Pressing part 240 Arm section 321 Space 330, 430 Ventilation section 340 Seal part 440 Porous adsorption material 500 cutting equipment 510 cutting blade 520, 620 shaft section 600 Polishing equipment 610 Sharpening Stone 700 Coating equipment 800 Control Unit

Claims

1. A process of fixing each of the multiple power generation elements contained in the flat plate, The process involves cutting the flat plate to separate the multiple power generation elements individually, A step in which multiple holding units, whose relative positions can be changed, hold the multiple power generation elements, The process involves the plurality of holding units changing the relative positions of at least two of the plurality of power generation elements so that they are in a position suitable for the next process, The process includes performing the following steps on at least two of the multiple power generation elements held by the multiple holding units, Battery manufacturing method.

2. The aforementioned fixing step is performed using a jig different from the plurality of holding units. The holding process is performed by the plurality of holding units while the jig is fixing each of the plurality of power generation elements. A method for manufacturing a battery according to claim 1.

3. The aforementioned fixing process is performed by the plurality of holding units. A method for manufacturing a battery according to claim 1.

4. The aforementioned fixing process is carried out by pressing down on each of the multiple power generation elements. A method for manufacturing a battery according to any one of claims 1 to 3.

5. The holding process is carried out by pressing down, clamping, or adsorbing each of the multiple power generation elements. A method for manufacturing a battery according to any one of claims 1 to 3.

6. The plurality of holding units are capable of changing at least one of the planar position, height, and rotation angle of the power generation element they hold. A method for manufacturing a battery according to any one of claims 1 to 3.

7. The plurality of holding units change at least one of the planar position, height, and rotation angle of the power generation element being held during the period in which the following processing is being performed. A method for manufacturing a battery according to claim 6.

8. The plurality of holding units change at least one of the planar position, height, and rotation angle of the power generation element they hold, based on numerical information output from the control unit. A method for manufacturing a battery according to claim 6.

9. The power generation element includes a positive electrode plate, a negative electrode plate, and an intermediate layer located between the positive electrode plate and the negative electrode plate. A method for manufacturing a battery according to any one of claims 1 to 3.

10. The aforementioned power generation element is a power generation element for an all-solid-state battery. A method for manufacturing a battery according to any one of claims 1 to 3.

11. A cutting device that cuts a flat plate while each of the multiple power generation elements contained in the flat plate is fixed, thereby separating the multiple power generation elements individually, Multiple holding units that hold the multiple power generation elements and whose relative positions can be changed, By controlling the plurality of holding units, at least two of the plurality of power generation elements are controlled A control unit that changes the positional relationship of the elements to a positional relationship suitable for the next process, The apparatus comprises a processing device that performs the following processing on at least two of the plurality of power generation elements held by the plurality of holding units, Battery manufacturing system.

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