Lamination equipment, electrode laminate manufacturing line, electrode laminate manufacturing method

Abstract

The present invention provides a lamination apparatus that shortens the time required for stacking multiple electrode bodies, a manufacturing line for electrode stacks, and a method for manufacturing electrode stacks. [Solution] A stacking device 1 is positioned downstream of a transport device that transports a plurality of electrode bodies 30, and stacks a plurality of electrode bodies 30, comprising: a mounting plate 10 for stacking a plurality of electrode bodies 30 being transported by the transport device; a wall portion 110 erected on the mounting plate 10 and positioned opposite to the transport direction of the electrode bodies 30; and a pressing portion 120 for pressing the sides of the plurality of electrode bodies 30 stacked on the mounting plate 10 toward the wall portion 110, wherein the wall portion 110 straightens the electrode bodies 30, and the pressing portion 120 has a cylindrical rotating portion 121 that rotates in the lateral direction of the electrode bodies 30 when it comes into contact with the sides of the electrode bodies 30 transported by the transport device, the stacking device 1.

Description

Technical Field

[0001] The present invention relates to a laminating device, a production line for an electrode laminate, and a method for producing an electrode laminate.

Background Art

[0002] In recent years, research and development have been conducted on secondary batteries that contribute to energy efficiency in order to enable more people to access affordable, reliable, sustainable, and advanced energy.

[0003] Laminated cells and laminated rectangular cells used as secondary batteries have a structure in which a plurality of electrode bodies are laminated and housed in a laminate film or a cell can. Therefore, the process of manufacturing these battery cells includes a process of laminating a plurality of electrode bodies.

[0004] For example, Patent Document 1 discloses a technique for laminating a positive electrode sheet, a negative electrode sheet, a separator, etc. by the operation of a swing unit having an arm.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, the conventional technology disclosed in Patent Document 1 may take time until the lamination is completed because each one is gripped by an arm and laminated, and there is room for improvement.

[0007] The present invention provides a laminating device, a production line for an electrode laminate, and a method for producing an electrode laminate that shorten the time required for laminating a plurality of electrode bodies. And it contributes to energy efficiency. [Means for solving the problem]

[0008] To achieve the above objective, the present invention provides the following means. [1] A stacking device arranged downstream of a transport device that transports multiple electrode bodies, the stacking device for stacking the multiple electrode bodies, A mounting plate on which the plurality of electrode bodies being transported by the transport device are stacked, A wall portion erected on the mounting plate and positioned opposite the direction of transport of the electrode body, The mounting plate is equipped with a pressing section that presses the sides of the multiple electrode bodies stacked on the mounting plate toward the wall section, The wall portion is used to correct the arrangement of the electrode body. The stacking apparatus has a cylindrical rotating part that rotates in the lateral direction of the electrode body when the pressing part comes into contact with the side surface of the electrode body transported by the transport device.

[0009] According to the above embodiment, stacking can be performed by utilizing the movement of the electrode body itself as it is being transported, thus shortening the time required to complete the stacking. Furthermore, since the transported electrode body comes into contact with the wall and is pressed towards the wall by the rotating part of the pressing unit, displacement of the electrode body is prevented.

[0010] [2] The stacking apparatus according to [1], wherein the rotating part rotates in the lateral direction of the electrode body, thereby drawing the electrode body closer to the plurality of electrode bodies stacked on the plate described above and stacking them.

[0011] According to the above embodiment, multiple electrode bodies can be stacked and aligned.

[0012] [3] The stacking apparatus according to [1] or [2], wherein the pressing portion has a mechanism for separating the rotating portion from the wall portion as the plurality of electrode bodies are stacked.

[0013] According to the above embodiment, even if the number of stacked electrode bodies increases, multiple electrode bodies can be stacked and aligned while maintaining a state in which the electrode bodies are pressed towards the wall by the rotating part.

[0014] [4] The device includes a detection unit for detecting the number of stacked electrodes, A stacking apparatus according to any one of [1] to [3], wherein, based on the detection result of the detection unit, the distance from the surface of the wall to which the electrode body is in contact with the surface of the wall to which the electrode body is in contact is increased in the direction perpendicular to the surface of the wall to which the electrode body is in contact with the surface of the wall, according to the number of stacked electrode bodies.

[0015] According to the above embodiment, even if the number of stacked electrode bodies increases, multiple electrode bodies can be stacked and aligned while maintaining a state in which the electrode bodies are pressed towards the wall by the rotating part.

[0016] [5] The stacking apparatus according to [4], wherein the distance from the surface of the wall to which the electrode body is in contact to the rotating part is 200 mm or less.

[0017] According to the above embodiment, even if the number of stacked electrode bodies increases, multiple electrode bodies can be stacked and aligned while maintaining a state in which the electrode bodies are pressed towards the wall by the rotating part.

[0018] [6] The stacking apparatus according to any one of [1] to [5], wherein the wall portion has a recess that is recessed in the thickness direction of the wall portion, with the surface of the wall portion in contact with the electrode body as the base end.

[0019] According to the above embodiment, even if multiple electrode bodies are stacked so as to be in contact with the side surface of the wall, the multiple electrode bodies can be retrieved while maintaining their stacked state by inserting a plate-shaped member into the recess and using the member to push the multiple electrode bodies in a direction away from the side surface of the wall.

[0020] [7] The lamination apparatus according to [6], further comprising a restraining jig for restraining the electrode body within the recess.

[0021] According to the above aspect, in a state where a plurality of electrode bodies are stacked so as to contact the side surface of the wall portion, the plurality of electrode bodies can be constrained by a constraining jig.

[0022] [8] The electrode body includes a first negative electrode layer, a first solid electrolyte layer, a positive electrode layer, a second solid electrolyte layer, and a second negative electrode layer. The electrode body has a current collector made of copper at an end in the stacking direction of the first negative electrode layer, the positive electrode layer, and the second negative electrode layer, and the stacking device according to any one of [1] to [7].

[0023] According to the above aspect, since the electrode body includes a solid electrolyte layer instead of a liquid or a gel, the possibility of damage to the electrode body when it collides with the wall portion can be reduced.

[0024] [9] A manufacturing line for an electrode laminate that conveys a plurality of electrode bodies and stacks the plurality of electrode bodies downstream in the conveyance direction, a conveyance device that conveys the plurality of electrode bodies, and the stacking device according to any one of [1] to [8], and a plurality of the stacking devices are provided, The manufacturing line for the electrode laminate stacks the electrode bodies on another stacking device when a predetermined number of the electrode bodies are stacked on one stacking device.

[0025] According to the above aspect, the electrode bodies can be continuously stacked, and the time required until the stacking is completed can be shortened.

[0026]

[10] A method for manufacturing an electrode laminate that conveys a plurality of electrode bodies and stacks the plurality of electrode bodies downstream in the conveyance direction, a step of stacking the conveyed plurality of electrode bodies, and a step of correcting the stacked state of the plurality of electrode bodies.

[0027] According to the above aspect, the electrode bodies can be continuously stacked, and the time required until the stacking is completed can be shortened. [Effects of the Invention]

[0028] According to the present invention, it is possible to provide a lamination apparatus that shortens the time required for laminating multiple electrode bodies, a manufacturing line for electrode laminates, and a method for manufacturing electrode laminates. [Brief explanation of the drawing]

[0029] [Figure 1] This is a schematic diagram showing a manufacturing line for an electrode stack according to an embodiment of the present invention. [Figure 2] This is a plan view showing a first example of a stacking apparatus (stocker) according to an embodiment of the present invention, where (a) is a diagram showing the state before stacking the electrode bodies, and (b) is a diagram showing the state after stacking the electrode bodies. [Figure 3] This is a plan view showing a second example of a stacking apparatus (stocker) according to an embodiment of the present invention, where (a) is a diagram showing the state before stacking the electrode bodies, and (b) is a diagram showing the state after stacking the electrode bodies. [Figure 4] This is a plan view showing a third example of a stacking apparatus (stocker) according to an embodiment of the present invention, where (a) shows the state before stacking the electrode bodies, and (b) shows the state after stacking the electrode bodies. [Figure 5] This is a perspective view showing a laminate cell manufactured in a manufacturing line for an electrode body according to an embodiment of the present invention. [Modes for carrying out the invention]

[0030] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0031] [Manufacturing line and lamination equipment for electrode stacks] Figure 1 is a schematic diagram showing a manufacturing line for an electrode stack according to an embodiment of the present invention. As shown in Figure 1, the electrode stack manufacturing line 100 of this embodiment includes a transport device 2 for transporting a plurality of electrode bodies 30, and a stacking device (stocker) 1 located downstream of the transport device 2 for stacking the plurality of electrode bodies 30.

[0032] The conveying device 2 is equipped with electrode rolls 81 and 83 around which the negative electrode member 21 is wound, and an electrode roll 82 around which the positive electrode member 22 is wound. The positive electrode member 22 includes a current collector and a positive electrode active material coated on the current collector. The negative electrode member 21 includes a current collector and a negative electrode active material coated on the current collector. The battery cell in this embodiment is a solid-state battery, and a positive electrode member 22 (positive electrode layer) is arranged between a pair of negative electrode members 21 (negative electrode layer). A solid electrolyte layer is arranged between the positive electrode member (positive electrode layer) and the negative electrode member (negative electrode layer). In the electrode laminate manufacturing line 100, the solid electrolyte layer may be provided on both sides of the positive electrode member 22, or on one side of the negative electrode member 21. In this specification, the electrode body 30 is defined as the electrode body in which a positive electrode member 22 is arranged between the negative electrode members 21.

[0033] In a later step, tab leads are attached to the positive and negative electrode current collectors of each of the multiple electrode bodies 30, and the bodies are covered with a laminate film with the tab leads exposed. Figure 5 is a perspective view showing a laminate cell 40 using electrode bodies 30 manufactured on the electrode stack manufacturing line 100.

[0034] In this embodiment, the transport direction of the electrode body 30 coincides with the longitudinal axis direction of the electrode body 30. The electrode member 21 of the negative electrode roll 81 is guided by roll devices 71 and 72 and is superimposed with other electrode members by roll devices 61 and 62. The positive electrode roll 82 is guided by roll devices 61 and 62 and is superimposed with other electrode members. The electrode member 21 of the negative electrode roll 83 is guided by roll devices 73 and 74 and is superimposed with other electrode members by roll devices 61 and 62.

[0035] The three electrode members, stacked together by the roll devices 61 and 62, are then compressed from above and below by the roll presses 51 and 52 to form a single unit. Next, a laser cutter 4, installed above the transport path, emits a laser to cut into the scrap material on the outer circumference of the integrated electrode body 30. For example, when the electrode body 30 is transported to the transport device 2, which is a belt conveyor, the cut scrap material is wound up by the scrap material winding device 3.

[0036] The transport device 2 transports the electrode body 30 at a predetermined speed (for example, 100 meters per second). Once the electrode body 30 has been transported to the end of the transport device 2, it is ejected from the transport device 2 by inertia and falls onto the stacking device 1. The electrode bodies 30 sent from the transport device 2 are stacked sequentially on the stacking device 1. The stacking device 1 is positioned downstream of the transport device 2 and close to the transport device 2 (i.e., in a position where it can receive the electrode bodies 30 sent from the transport device 2).

[0037] Figure 2 is a plan view showing a first example of a stacking apparatus (stocker) according to an embodiment of the present invention, where (a) shows the state before stacking the electrode bodies, and (b) shows the state after stacking the electrode bodies. Let the stacking device 1 in the first example be referred to as stacking device 1A. Stacking device 1A has a mounting plate 10 on which multiple electrode bodies 30 transported by the transport device 2 are stacked. The mounting plate 10 has a wall portion 110 and a pressing portion 120. The wall portion 110 is erected on the mounting plate 10 along the transport direction. The pressing portion 120 is erected on one end of the wall portion 110 in the transport direction, on the surface (side surface) 110a of the wall portion 110 that contacts the electrode body 30. The pressing portion 120 has a cylindrical rotating portion 121 that rotates in the direction of the side surface 30a of the electrode body 30 when it comes into contact with the side surface 30a of the electrode body 30 transported by the transport device 2.

[0038] The wall portion 110 is the surface facing the electrode body 30 in the Y-axis direction, which is perpendicular to the transport direction.

[0039] The mounting plate 10 of the stacking device 1 tilts downward as it moves from the upstream side to the downstream side in the transport direction (X-axis direction), that is, as it moves away from the transport device 2. Therefore, the electrode body 30 being transported to the stacking device 1 moves downward toward the pressing part 120 and stops upon contact with the rotating part 121 of the pressing part 120. In addition, the mounting plate 10 of the stacking device 1 tilts downward as it moves away from the transport device 2 in the orthogonal direction (Y-axis direction) perpendicular to the transport direction. Therefore, the electrode body 30 being transported to the stacking device 1 moves downward along the wall part 110, comes into contact with the rotating part 121 of the pressing part 120, and stops when pressed by the rotating part 121 toward the side surface 110a of the wall part 110. In other words, the wall part 110 corrects the position of the electrode body 30 toward the stacking device 1.

[0040] As a result, the multiple electrode bodies 30 that are continuously transported from the transport device 2 are stacked and aligned while in contact with the wall portion 110 and the rotating portion 121 of the pressing portion 120.

[0041] The rotating part 121 rotates in the direction of the side surface 30a of the electrode body 30, thereby drawing the electrode body 30 closer to the multiple electrode bodies 30 stacked on the mounting plate 10, as shown in Figure 2. As a result, the multiple electrode bodies 30 are stacked and aligned.

[0042] The pressing section 120 has a mechanism to separate the rotating section 121 from the wall section 110 as multiple electrode bodies 30 are stacked, as shown in Figure 2. In the first example, as shown in Figure 2, the pressing section 120 has an arm section 122 that rotatably holds the rotating section 121, and a support section 123 that is erected on the side surface 110a of the wall section 110 and supports the arm section 122 so that it moves in a direction away from the side surface 110a of the wall section 110. As a result, even if the number of stacked electrode bodies 30 increases, multiple electrode bodies 30 can be stacked and aligned while maintaining a state in which the electrode bodies 30 are pressed towards the side surface 110a of the wall section 110 by the rotating section 121. For example, when stacking 100 electrode bodies, although the thickness of each electrode is thin, the height of the outermost surface varies due to the cellularization. By providing a movable part in the pressing section to absorb this height variation, it becomes possible to align the edges. It also becomes possible to absorb the impact received when the electrode body 30 comes into contact with the pressing section.

[0043] Figure 3 is a plan view showing a second example of a stacking apparatus (stocker) according to an embodiment of the present invention, where (a) shows the state before stacking the electrode bodies, and (b) shows the state after stacking the electrode bodies. In Figure 3, components identical to those shown in Figure 2 are denoted by the same reference numerals, and their descriptions are omitted. In the second example, the stacking device 1 is referred to as stacking device 1B. In stacking device 1B, the mounting plate 10 has a wall portion 110 and a pressing portion 130. The pressing portion 130 is erected on the side surface 110a of the wall portion 110 at one end of the wall portion 110 in the transport direction. The pressing portion 130 has a cylindrical rotating portion 131 that rotates in the direction of the side surface 30a of the electrode body 30 when it comes into contact with the side surface 30a of the electrode body 30. By rotating in the direction of the side surface 30a of the electrode body 30, the rotating portion 131 pulls the electrode body 30 onto the multiple electrode bodies 30 stacked on the mounting plate 10, as shown in Figure 3. As a result, the multiple electrode bodies 30 are stacked and aligned.

[0044] The pressing section 130 has a mechanism to separate the rotating section 131 from the wall section 110 as multiple electrode bodies 30 are stacked, as shown in Figure 3. In the second example, as shown in Figure 3, the pressing section 130 has an arm section 132 that rotatably holds the rotating section 131, a first support section 133 that supports the arm section 132 so that it moves away from the side surface 110a of the wall section 110, and a second support section 134 that supports the first support section 133 and is erected on the side surface 110a of the wall section 110. As a result, even if the number of stacked electrode bodies 30 increases, multiple electrode bodies 30 can be stacked and aligned while maintaining a state in which the electrode bodies 30 are pressed towards the side surface 110a of the wall section 110 by the rotating section 131.

[0045] Figure 4 is a plan view showing a third example of a stacking apparatus (stocker) according to an embodiment of the present invention, where (a) shows the state before stacking the electrode bodies, and (b) shows the state after stacking the electrode bodies. In Figure 4, components identical to those shown in Figure 2 are denoted by the same reference numerals, and their descriptions are omitted. In the third example, the stacking apparatus 1 is referred to as stacking apparatus 1C. In addition to the configuration of stacking apparatus 1A, stacking apparatus 1C has a wall portion 110 that has a recess 111 that is recessed in the thickness direction of the wall portion 110, with the side surface 110a of the wall portion 110 as the base end. As a result, even if multiple electrode bodies 30 are stacked so as to be in contact with the side surface 110a of the wall portion 110, a plate-shaped member can be inserted into the recess 111, and the member can be used to push the multiple electrode bodies 30 in a direction away from the side surface 110a of the wall portion 110, thereby allowing the multiple electrode bodies 30 to be retrieved while maintaining their stacked state.

[0046] In the stacking apparatus 1C, it is preferable to provide a restraining jig 140 for restraining the electrode body 30 within the recess 111. This allows the restraining jig 140 to restrain the multiple electrode bodies 30 when they are stacked so as to be in contact with the side surface 110a of the wall portion 110. Consequently, the multiple electrode bodies 30 can be stacked and aligned.

[0047] The stacking device 1 preferably includes a detection unit (not shown) for detecting the number of stacked electrode bodies 30. Based on the detection result of the detection unit, the stacking device 1 increases the distance from the side surface 110a of the wall 110 to the rotating units 121 and 131 in the perpendicular direction of the side surface 110a of the wall 110, according to the number of stacked electrode bodies 30. As a result, even if the number of stacked electrode bodies 30 increases, multiple electrode bodies 30 can be stacked and aligned while maintaining a state in which the electrode bodies 30 are pressed towards the side surface 110a of the wall 110 by the rotating unit 131.

[0048] The distance from the side surface 110a of the wall portion 110 to the rotating portions 121 and 131 is preferably 200 mm or less. When the distance is 200 mm or less, even if the number of stacked electrode bodies 30 increases, the rotating portion 131 can maintain a state in which the electrode bodies 30 are pressed towards the side surface 110a of the wall portion 110, allowing multiple electrode bodies 30 to be stacked and aligned.

[0049] The electrode body 30 includes a first negative electrode layer, a first solid electrolyte layer, a positive electrode layer, a second solid electrolyte layer, and a second negative electrode layer. The electrode body 30 has a current collector whose ends in the stacking direction of the first negative electrode layer, the positive electrode layer, and the second negative electrode layer are made of copper.

[0050] (Positive electrode layer) The positive electrode layer is formed by laminating a first current collector and a positive electrode material layer containing at least a positive electrode active material.

[0051] The first current collector is preferably composed of at least one material with high conductivity. The end of the first current collector is made of copper. Examples of highly conductive materials include metals or alloys containing at least one metallic element from silver (Ag), palladium (Pd), gold (Au), platinum (Pt), aluminum (Al), chromium (Cr), and nickel (Ni), or nonmetals such as carbon (C). Considering both high conductivity and manufacturing cost, aluminum, nickel, or stainless steel are preferred. Furthermore, aluminum is less reactive with the positive electrode active material and electrolyte. Therefore, using aluminum as the first current collector can reduce the internal resistance of the battery.

[0052] Examples of the shape of the first current collector include foil, plate, mesh, nonwoven fabric, and foam forms. In addition, carbon or the like may be placed on the surface of the first current collector, or the surface may be roughened, in order to improve adhesion with the positive electrode active material layer.

[0053] The positive electrode active material layer contains a positive electrode active material that exchanges lithium ions and electrons. The positive electrode active material is not particularly limited as long as it is a material that can reversibly release and absorb lithium ions and transport electrons, and known positive electrode active materials applicable to the positive electrode of a lithium-ion battery can be used. For example, lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), lithium manganese oxide (LiMn2O4), solid solution oxide (Li2MnO3-LiMO2 (M=Co, Ni, etc.)), lithium-manganese-nickel-cobalt oxide (LiNi x Mn y Co z Examples include composite oxides such as O2 (x+y+z=1), olivine-type lithium phosphate oxide (LiFePO4); conductive polymers such as polyaniline and polypyrrole; sulfides such as Li2S, CuS, Li-Cu-S compounds, TiS2, FeS, MoS2, and Li-Mo-S compounds; and mixtures of sulfur and carbon. The positive electrode active material may consist of one of the above materials alone or of two or more materials.

[0054] The positive electrode active material layer contains an electrolyte that facilitates the exchange of lithium ions with the positive electrode active material. The electrolyte is not particularly limited as long as it has lithium ion conductivity; generally, materials used in lithium-ion batteries can be used. Examples of electrolytes include inorganic solid electrolytes such as sulfide solid electrolyte materials, oxide solid electrolyte materials, halide solid electrolytes, and lithium-containing salts; polymer-based solid electrolytes such as polyethylene oxide; and gel-based solid electrolytes containing lithium-containing salts or lithium-ion conductive ionic liquids. Of these, sulfide solid electrolyte materials are preferred from the viewpoint of high lithium ion conductivity, good structural moldability by pressing, and good interfacial bonding properties. The electrolyte may consist of one of the above materials alone, or it may consist of two or more materials. The electrolyte contained in the first active material layer may be the same material as the electrolyte contained in the second active material layer or the solid electrolyte layer, or it may be a different material.

[0055] The positive electrode active material layer may contain a conductive additive to improve the conductivity of the positive electrode. Conductive additives generally usable in lithium-ion batteries can be used. Examples include carbon black such as acetylene black and kecheng black; carbon fiber; vapor-phase carbon fiber; graphite powder; and carbon nanotubes. The conductive additive may consist of one of the above materials alone or of two or more materials.

[0056] Furthermore, the positive electrode active material layer may include a binder that serves to bond the positive electrode active materials together and to the first current collector.

[0057] The first current collector is assembled at one end of the electrode body 30 in the width direction. Because the positive electrode active material layer is in contact with the solid electrolyte layer, it may contain sulfides present in the solid electrolyte layer.

[0058] (First negative electrode layer, second negative electrode layer) The first negative electrode layer and the second negative electrode layer are formed by laminating a second current collector and a negative electrode active material layer containing at least a negative electrode active material.

[0059] The second current collector contains at least copper (Cu). The second current collector, like the first current collector, may also contain a substance other than copper with high conductivity. Examples of substances other than copper with high conductivity include metals or alloys containing at least one metallic element from silver (Ag), palladium (Pd), gold (Au), platinum (Pt), chromium (Cr), and nickel (Ni), or nonmetals such as carbon (C). Considering both high conductivity and manufacturing cost, nickel or stainless steel are preferred as the substance other than copper. Furthermore, stainless steel is less reactive with the positive electrode active material, negative electrode active material, and electrolyte. Therefore, using stainless steel for the second current collector foil can reduce the manufacturing cost of the battery.

[0060] Examples of the shape of the second current collector include foil, plate, mesh, nonwoven fabric, and foam forms. Furthermore, in order to improve adhesion with the second active material layer, carbon or the like may be placed on the surface of the second current collector, or the surface may be roughened.

[0061] The negative electrode active material layer contains a negative electrode active material that exchanges electrons with lithium ions. The negative electrode active material is not particularly limited as long as it is a material that can reversibly release and absorb lithium ions and transport electrons, and known negative electrode active materials applicable to the negative electrode of a lithium-ion battery can be used. For example, carbonaceous materials such as natural graphite, artificial graphite, resin carbon, carbon fiber, activated carbon, hard carbon, and soft carbon; alloy materials mainly composed of tin, tin alloys, silicon, silicon alloys, gallium, gallium alloys, indium, indium alloys, aluminum, and aluminum alloys; conductive polymers such as polyacene, polyacetylene, and polypyrrole; metallic lithium; lithium titanium composite oxide (e.g., Li4Ti5O) 12 Examples include lithium alloys such as ). These negative electrode active materials may consist of one of the above materials alone or of two or more materials.

[0062] The negative electrode active material layer contains an electrolyte that facilitates the exchange of lithium ions with the negative electrode active material. The electrolyte is not particularly limited as long as it is lithium-ion conductive; generally, materials used in lithium-ion batteries can be used. Examples of electrolytes include inorganic solid electrolytes such as sulfide solid electrolyte materials, oxide solid electrolyte materials, halide solid electrolytes, and lithium-containing salts; polymer-based solid electrolytes such as polyethylene oxide; and gel-based solid electrolytes containing lithium-containing salts or lithium-ion conductive ionic liquids. The electrolyte may be composed of one of the above materials alone, or of two or more materials. The electrolyte contained in the second active material layer may be the same as or different from the electrolyte contained in the first active material layer or the solid electrolyte layer.

[0063] The negative electrode active material layer may contain conductive additives and binders. There are no particular restrictions on these materials, but for example, materials similar to those used in the positive electrode active material layer described above can be used.

[0064] (First solid electrolyte layer, second solid electrolyte layer) The first solid electrolyte layer and the second solid electrolyte layer are positioned between the positive electrode active material layer and the negative electrode active material layer.

[0065] As for the electrolyte, there are no particular restrictions as long as it has lithium-ion conductivity and insulating properties, and materials commonly used in lithium-ion batteries can be used. Examples include inorganic solid electrolytes such as sulfide solid electrolyte materials, oxide solid electrolyte materials, halide solid electrolytes, and lithium-containing salts, as well as polymer-based solid electrolytes such as polyethylene oxide, and gel-based electrolytes containing lithium-containing salts or lithium-ion conductive ionic liquids. Of these, sulfide solid electrolyte materials are preferred from the viewpoint of high lithium-ion conductivity and good structural moldability and interfacial bonding properties when pressed. There are no particular restrictions on the form of the electrolyte material, but for example, it can be in the form of particulate matter.

[0066] The first solid electrolyte layer and the second solid electrolyte layer may contain an adhesive to provide mechanical strength and flexibility.

[0067] The first solid electrolyte layer and the second solid electrolyte layer may be in the form of a sheet having a porous substrate and a solid electrolyte held in the porous substrate. There are no particular restrictions on the form of the porous substrate, but examples include woven fabric, nonwoven fabric, mesh cloth, porous membrane, expanded sheet, punched sheet, etc. Of these forms, nonwoven fabric is preferred from the viewpoint of handling, which allows for a higher amount of solid electrolyte filling.

[0068] The porous substrate described above is preferably made of an insulating material. This improves the insulating properties of the first solid electrolyte layer and the second solid electrolyte layer. Examples of insulating materials include resin materials such as nylon, polyester, polyethylene, polypropylene, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, polyvinylidene fluoride, polyvinylidene chloride, polyvinyl chloride, polyurethane, vinylon, polybenzimidazole, polyimide, polyphenylene sulfite, polyetheretherketone, cellulose, and acrylic resins; natural fibers such as hemp, wood pulp, and cotton linters; and glass.

[0069] According to the lamination apparatus 1 of this embodiment, lamination can be performed by utilizing the movement of the electrode bodies being transported, thus shortening the time required to complete lamination. Furthermore, since the transported electrode bodies come into contact with the wall and are pressed toward the wall by the rotating part of the pressing unit, displacement of the electrode bodies is prevented. In addition, in the electrode laminate manufacturing line 100 of this embodiment, multiple lamination apparatuses 1 may be provided. If multiple lamination apparatuses 1 are provided, when a predetermined number of electrode bodies 30 have been laminated in one lamination apparatus 1, the electrode bodies 30 are laminated in another lamination apparatus 1.

[0070] According to the electrode stack manufacturing line 100 of this embodiment, electrode stacks can be stacked continuously, and the time required to complete the stacking process can be shortened.

[0071] [Manufacturing method for electrode stacks] An embodiment of the present invention provides a method for manufacturing an electrode stack, comprising: a step of stacking the transported electrode stacks downstream in the transport direction; and a step of correcting the stacked state of the electrode stacks.

[0072] In the method for manufacturing the electrode stack of this embodiment, for example, the manufacturing line 100 of the electrode stack of the above-described embodiment is used.

[0073] In the first step, multiple electrode bodies 30, which are being transported at a predetermined speed by the transport device 2, are stacked in the stacking device 1.

[0074] In the second step, for example, using the stacking device 1A, multiple electrode bodies 30 that are continuously transported from the transport device 2 are moved downward along the wall portion 110, and the rotating portion 121 of the pressing portion 120 presses the electrode bodies 30 toward the side surface 110a of the wall portion 110. As a result, the multiple electrode bodies 30 are stacked and aligned in contact with the wall portion 110 and the rotating portion 121 of the pressing portion 120.

[0075] According to the method for manufacturing electrode stacks of this embodiment, electrode stacks can be stacked continuously, and the time required to complete the stacking process can be shortened.

[0076] Although embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications and changes are possible within the scope of the gist of the present invention as described in the claims. [Explanation of Symbols]

[0077] 1. Stacking device (stocker) 2. Conveying device 10 Mounting plate 30 Electrode body 40 Laminate Cells 100 electrode stack manufacturing line 110 Wall section 120, 130 Pressing part 121,131 Rotating part

Claims

1. A stacking device is positioned downstream of a transport device that transports multiple electrode bodies, and stacks the multiple electrode bodies, A mounting plate on which the plurality of electrode bodies being transported by the transport device are stacked, A wall portion erected on the mounting plate and positioned opposite the direction of transport of the electrode body, The mounting plate is equipped with a pressing section that presses the sides of the multiple electrode bodies stacked on the mounting plate toward the wall section, The wall portion is used to correct the arrangement of the electrode body. The stacking apparatus has a cylindrical rotating part that rotates in the lateral direction of the electrode body when the pressing part comes into contact with the side surface of the electrode body transported by the transport device.

2. The stacking apparatus according to claim 1, wherein the rotating part rotates in the lateral direction of the electrode body, thereby drawing the electrode body closer to the plurality of electrode bodies stacked on the aforementioned mounting plate and stacking them.

3. The stacking apparatus according to claim 1, wherein the pressing portion has a mechanism for separating the rotating portion from the wall portion as the plurality of electrode bodies are stacked.

4. The system includes a detection unit for detecting the number of stacked electrodes, The stacking apparatus according to claim 1, wherein, based on the detection result of the detection unit, the distance from the surface of the wall to which the electrode bodies are in contact to the rotating unit is increased in the direction perpendicular to the surface of the wall to which the electrode bodies are in contact, according to the number of stacked electrode bodies.

5. The lamination apparatus according to claim 4, wherein the distance from the surface of the wall portion to which the electrode body is in contact to the rotating portion is 200 mm or less.

6. The lamination apparatus according to claim 1, wherein the wall portion has a recess that is recessed in the thickness direction of the wall portion, with the surface of the wall portion in contact with the electrode body as the base end.

7. The lamination apparatus according to claim 6, further comprising a restraining jig for restraining the electrode body within the recess.

8. The electrode body includes a first negative electrode layer, a first solid electrolyte layer, a positive electrode layer, a second solid electrolyte layer, and a second negative electrode layer. The lamination apparatus according to claim 1, wherein the electrode body has a current collector whose end portion in the lamination direction of the first negative electrode layer, the positive electrode layer, and the second negative electrode layer is made of copper.

9. A manufacturing line for electrode stacks that transports multiple electrode bodies and stacks the multiple electrode bodies downstream in the transport direction, A transport device for transporting the plurality of electrode bodies, The stacking apparatus is as described in any one of claims 1 to 8, Multiple stacking devices are provided, The electrode stacking line is a line for manufacturing electrode stacks in which, when a predetermined number of electrodes have been stacked in one stacking device, the electrodes are stacked in another stacking device.

10. A method for manufacturing an electrode stack, comprising transporting multiple electrode bodies and stacking the multiple electrode bodies downstream in the transport direction, A step of stacking the multiple electrode bodies that are being transported, A method for manufacturing an electrode stack, comprising the step of correcting the stacked state of the plurality of electrode bodies.

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