Manufacturing method of stacked battery

Abstract

To provide a manufacturing method for a lamination type battery in which the decrease in yield can be suppressed.SOLUTION: A manufacturing method for a lamination type battery in this disclosure includes the steps of: preparing a jig-equipped electrode body lamination sheet including an electrode body lamination sheet including a unit electrode body sheet in which a positive electrode sheet, an insulating sheet, and a negative electrode sheet are stacked in this order along a first direction, and at least one jig holding a partial region of both surfaces of the electrode body lamination sheet in the first direction; pressing the jig-equipped electrode body lamination sheet with a pair of pressing mechanisms; and cutting the electrode body lamination sheet exposed from the jig by cutting with a rotary blade. The jig includes a pair of jig plates covering a partial region of both surfaces. In the cutting, the electrode body lamination sheet exposed from the jig is cut while the pair of jig plates and the electrode body lamination sheet are in physical contact with each other by the pressing of the pair of pressing mechanisms.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a method for manufacturing a stacked battery. [Background technology]

[0002] In recent years, there has been an increasing demand for high-output stacked batteries as large-scale energy sources for electric vehicles, etc. A stacked battery includes at least one unit electrode assembly in which a positive electrode, a negative electrode, and an electrolyte layer that electrically insulates the positive electrode and the negative electrode are stacked.

[0003] Patent Document 1 discloses a method for manufacturing a stacked battery, in which an electrode assembly laminate sheet in which a positive electrode, an electrolyte, and a negative electrode are laminated and integrated is cut to a desired size. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-231796 Summary of the Invention [Problem to be solved by the invention]

[0005] A rotary blade may be used to cut the electrode laminate sheet. When cutting the electrode laminate sheet using a rotary blade, a jig-attached electrode laminate sheet is generally used to prevent the electrode laminate sheet from being displaced.

[0006] An example of a method for cutting an electrode assembly laminate sheet using a rotary blade is shown in Fig. 6. In Fig. 6, reference numeral 931 denotes the rotation axis of the rotary blade 930. Reference numeral D930 denotes the rotation direction of the rotary blade 930. Reference numeral D900 denotes the movement direction of the jig-attached electrode assembly laminate sheet 900 that moves relative to the rotary blade 930.

[0007] The jig-equipped electrode assembly laminate sheet 900 includes an electrode assembly laminate sheet 910 and a jig 920 that fixes the electrode assembly laminate sheet 910. A portion of the electrode assembly laminate sheet 910 is exposed from the jig 920. The jig 920 has a pair of jig plates 921, 922 and a plurality of bolts 923. The plurality of bolts 923 are arranged at both ends of the pair of jig plates 921, 922 in the feed direction D900, and fasten the pair of jig plates 921, 922 together.

[0008] In the jig-attached electrode assembly laminate sheet 900, a gap R900 may be formed between the electrode assembly laminate sheet 910 and the jig plate 921 at the center of the jig-attached electrode assembly laminate sheet 900 in the feed direction D900. In particular, the longer the length of the electrode assembly laminate sheet 910 in the feed direction D900, the more likely the gap R900 is to be formed. If the gap R900 is formed, the electrode assembly laminate sheet 910 may vibrate relative to the jig plates 921 and 922 while the electrode assembly laminate sheet 910 exposed from the jig 920 is cut by the rotary blade 930. This may cause defects on the cut surface of the electrode assembly laminate sheet 910. Defects include the occurrence of powder sliding off of layers (e.g., positive electrodes, etc.) (hereinafter also referred to as "constituent layers") constituting the electrode assembly laminate sheet 910 and the occurrence of burrs on the constituent layers. "Burrs on the constituent layers" refer to portions of the constituent layers that are not cut by the rotary blade 930 and protrude from the cut surface of the electrode assembly laminate sheet 910. If a defect occurs on the cut surface of the electrode assembly laminate sheet 910, a short circuit may occur between the constituent layers of the electrode assembly laminate sheet 910. Therefore, an electrode assembly laminate sheet 910 with a defect on the cut surface is treated as a defective product. As a result, conventional methods for cutting electrode assembly laminate sheets may result in a decrease in yield.

[0009] The present disclosure has been made in consideration of the above circumstances. An object of one embodiment of the present disclosure is to provide a method for manufacturing a stacked battery that can suppress a decrease in yield. [Means for solving the problem]

[0010] The means for solving the above problems include the following embodiments. <1> A method for manufacturing a stacked battery according to a first aspect of the present disclosure includes preparing a jig-equipped electrode laminate sheet including at least one unit electrode sheet formed by stacking a positive electrode sheet, an insulating sheet, and a negative electrode sheet in this order along a first direction, and at least one jig for clamping partial areas of both surfaces of the electrode laminate sheet in the first direction; pressing the jig-equipped electrode laminate sheet, which moves relative to a rotary blade along a second direction perpendicular to the first direction, with a pair of pressing mechanisms disposed on both sides of the rotary blade in the second direction; and cutting, with the rotary blade, the electrode body laminate sheet that is included in the jig-equipped electrode body laminate sheet and that is exposed from the jig, wherein the jig has a pair of jig plates that cover partial areas of both surfaces, and a plurality of fasteners that are arranged at both ends of the pair of jig plates in the second direction and fasten the pair of jig plates together, and in the cutting, the electrode body laminate sheet that is exposed from the jig is cut in a state where the pair of jig plates and the electrode body laminate sheet are in physical contact with each other by being pressed by the pair of pressing mechanisms.

[0011] A "laminated battery" refers to a battery including an electrode assembly formed by laminating a sheet-shaped positive electrode, a sheet-shaped negative electrode, and a sheet-shaped insulating layer that electrically insulates the positive and negative electrodes. The positive electrode sheet, insulating sheet, and negative electrode sheet included in the electrode assembly laminate sheet are cut to the desired size and function as the positive electrode, insulating layer, and negative electrode, respectively. An "insulating sheet" refers to a sheet that combines ion transport properties that transport desired ions with electronic insulation properties (i.e., electrical insulation) that make it difficult to transport ions other than the desired ions. A "rotary blade" refers to a rotating circular saw or circular blade.

[0012] In the first aspect, even if a gap is formed between the jig plate and the electrode assembly laminate sheet in the center of the jig-attached electrode assembly laminate sheet in the second direction (for example, when the length of the electrode assembly laminate sheet in the second direction is relatively long), the electrode assembly laminate sheet exposed from the jig is cut while the pair of jig plates and the electrode assembly laminate sheet are in physical contact with each other due to the pressing of a pair of pressing mechanisms. Therefore, while the electrode assembly laminate sheet is being cut with the rotary blade, the electrode assembly laminate sheet is less likely to vibrate relative to the jig plate. As a result, defects are less likely to occur on the cut surface of the electrode assembly laminate sheet. In other words, the occurrence of defective products is suppressed. Therefore, the manufacturing method of a stacked battery of the first aspect can suppress a decrease in yield.

[0013] <2> In a manufacturing method of a laminated battery according to a second aspect of the present disclosure, the cutting is performed using a pressing device, the pressing device including the pressing mechanism, a surface pressure sensor that measures a surface pressure applied to the electrode laminate sheet, a pressing force adjustment mechanism that adjusts the pressing force of the pair of pressing mechanisms, and a control unit that controls the pressing force adjustment mechanism based on a measurement value of the surface pressure measured by the surface pressure sensor, and in the pressing, the control unit determines whether the measurement value exceeds an upper threshold value or whether the measurement value does not exceed a lower threshold value, and if the control unit determines that the measurement value exceeds the upper threshold value, the pressing force adjustment mechanism weakens the pressing force, and if the control unit determines that the measurement value does not exceed the lower threshold value, the pressing force adjustment mechanism strengthens the pressing force. <1> 1. A method for manufacturing the stacked battery according to claim 1.

[0014] In the second aspect, the surface pressure of the portion of the electrode assembly laminate sheet being cut by the rotary blade is maintained within a predetermined range. This makes it less likely that the electrode assembly laminate sheet will vibrate relative to the jig plate while being cut by the rotary blade. As a result, the manufacturing method of the stacked battery of the second aspect can further suppress a decrease in yield.

[0015] <3> In a third aspect of the manufacturing method for a stacked battery of the present disclosure, the pressing mechanism presses at least a region of the jig plate on a side where the electrode body laminate sheet is to be cut in a third direction perpendicular to each of the first direction and the second direction. <1> or <2> 1. A method for manufacturing the stacked battery according to claim 1.

[0016] In the third aspect, the surface pressure at the portion of the electrode assembly laminate sheet being cut by the rotary blade is likely to be higher than when the pressing mechanism presses an area of ​​the jig plate in the third direction that is not on the side where the electrode assembly laminate sheet is being cut. This makes it less likely that the electrode assembly laminate sheet will vibrate relative to the jig plate while being cut by the rotary blade. As a result, the manufacturing method of the stacked battery of the third aspect can further suppress a decrease in yield.

[0017] <4> In a fourth aspect of the present disclosure, there is provided a method for manufacturing a stacked battery, wherein the pressing mechanism has a rolling tool that is in rolling contact with the jig-attached electrode assembly laminate sheet. <1> ~ <3> The present invention provides a method for producing the stacked battery described in any one of the above.

[0018] In the fourth aspect, the pressing mechanism is more likely to increase the surface pressure of the portion of the electrode assembly laminate sheet being cut by the rotary blade as it moves relative to the rotary blade than when the pressing mechanism has a slider that slides against the jig-attached electrode assembly laminate sheet. This makes it less likely that the electrode assembly laminate sheet will vibrate relative to the jig plate while being cut by the rotary blade. As a result, the manufacturing method for a stacked battery according to the fourth aspect can further suppress a decrease in yield.

[0019] <5> In a fifth aspect of the present disclosure, there is provided a method for manufacturing a stacked battery, wherein the jig-attached electrode laminate sheet includes a pair of the jigs, and the pair of jigs are arranged to sandwich a portion of the electrode laminate sheet to be cut in a third direction perpendicular to each of the first direction and the second direction. <1> ~ <4> The present invention provides a method for producing the stacked battery described in any one of the above.

[0020] In the fifth aspect, the electrode assembly laminate sheet is more easily fixed than when the electrode assembly laminate sheet is not fixed by a pair of jigs. This makes it less likely that the electrode assembly laminate sheet will vibrate relative to the jigs while being cut with the rotary blade. In addition, the electrode assembly laminate sheet is more likely to be cut at a predetermined position. As a result, the manufacturing method of the stacked battery of the fifth aspect can further suppress a decrease in yield. [Effects of the Invention]

[0021] According to the present disclosure, a method for manufacturing a stacked battery that can suppress a decrease in yield is provided. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a diagram illustrating a method for cutting an electrode assembly laminate sheet according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a top view of a jig-attached electrode assembly laminate sheet according to an embodiment of the present disclosure. [Figure 3] FIG. 3 is a cross-sectional view of an electrode assembly laminate sheet according to an embodiment of the present disclosure. [Figure 4] FIG. 4 is a top view of a jig according to an embodiment of the present disclosure. [Figure 5] FIG. 5 is a diagram illustrating a configuration of a pressing device according to an embodiment of the present disclosure. [Figure 6] FIG. 6 is a diagram illustrating a conventional method for cutting an electrode laminate sheet. DETAILED DESCRIPTION OF THE INVENTION

[0023] In the present disclosure, a numerical range indicated using "to" means a range that includes the numerical values ​​before and after "to" as the minimum and maximum values, respectively. In the present disclosure, a combination of two or more preferred embodiments is a more preferred embodiment.

[0024] Hereinafter, an embodiment of a manufacturing method for a stacked battery according to the present disclosure will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0025] (1) Manufacturing method of stacked battery The manufacturing method of the stacked battery according to the embodiment includes preparing a jig-attached electrode assembly laminate sheet 1 (hereinafter also referred to as the "preparation step"), pressing the electrode assembly laminate sheet (hereinafter also referred to as the "pressing step"), and cutting the electrode assembly laminate sheet 10 included in the jig-attached electrode assembly laminate sheet 1 (hereinafter also referred to as the "cutting step"). The preparation step and cutting step are carried out in this order. The pressing step and cutting step are carried out simultaneously. This allows an electrode assembly laminate sheet 10 of a desired size to be obtained. The electrode assembly laminate sheet 10 is a rectangular parallelepiped object.

[0026] In the embodiment, one side in the longitudinal direction of the main surface of the electrode laminate sheet 10 is defined as the positive X-axis direction (hereinafter also referred to as the "right side"), and the opposite side is defined as the negative X-axis direction (hereinafter also referred to as the "left side"). One side in the lateral direction of the main surface of the electrode laminate sheet 10 is defined as the positive Y-axis direction (hereinafter also referred to as the "front side"), and the opposite side is defined as the negative Y-axis direction (hereinafter also referred to as the "rear side"). One side in the thickness direction of the electrode laminate sheet 10 is defined as the positive Z-axis direction (hereinafter also referred to as the "upper side"), and the opposite side is defined as the negative Z-axis direction (hereinafter also referred to as the "lower side"). The X-axis, Y-axis, and Z-axis are each perpendicular to one another. The Z-axis direction is an example of a first direction. The X-axis direction is an example of a second direction. The Y-axis direction is an example of a third direction. Note that these directions do not limit the orientation of the electrode laminate sheet 10 of the present disclosure during use.

[0027] (1.1) Preparation process In the preparation step, a jig-attached electrode laminate sheet 1 is prepared.

[0028] (1.1.1) Electrode laminate sheet with jig As shown in FIGS. 1 and 2, the jig-attached electrode assembly laminate sheet 1 includes one electrode assembly laminate sheet 10, a first jig 20A, and a second jig 20B (see FIG. 2). As shown in FIG. 2, the first jig 20A holds a partial region R20A (see FIG. 2) on both surfaces of the electrode assembly laminate sheet 10 in the front-rear direction (Y-axis direction). The second jig 20B holds a partial region R20B (see FIG. 2) on both surfaces of the electrode assembly laminate sheet 10 in the front-rear direction (Y-axis direction). The first jig 20A and the second jig 20B are arranged to sandwich the portion of the electrode assembly laminate sheet 10 to be cut (cutting line CC) (see FIG. 2) in the front-rear direction (Y-axis direction). The jig-attached electrode assembly laminate sheet 1 can be prepared by attaching the first jig 20A and the second jig 20B to the electrode assembly laminate sheet 10 by a known method.

[0029] (1.1.1.1) Electrode laminate sheet As shown in Fig. 3, the electrode assembly laminate sheet 10 is formed by stacking a plurality of unit electrode sheets 11 in the vertical direction (Z-axis direction). The unit electrode sheet 11 is formed by stacking a positive electrode sheet 12, a solid electrolyte sheet 13 which is an example of an insulating sheet, a negative electrode sheet 14, the solid electrolyte sheet 13, and the positive electrode sheet 12 in this order in the vertical direction (Z-axis direction). The electrode assembly laminate sheet 10 may be prepared by any known method. The electrode assembly laminate sheet 10 is a so-called sheet for a solid-state battery.

[0030] The positive electrode sheet 12 includes a positive electrode current collector 121 and a positive electrode composite layer 122 laminated on one main surface of the positive electrode current collector 121. The positive electrode current collector 121 is made of, for example, aluminum, copper, stainless steel, nickel, iron, titanium, or carbon. The positive electrode current collector 121 is, for example, in the form of a foil or a mesh. The positive electrode composite layer 122 contains a positive electrode active material (for example, LiCoO2, LiMn2O4, or LiFePO4). The positive electrode composite layer 122 may further contain a solid electrolyte (for example, a sulfide solid electrolyte, an oxide solid electrolyte, or a halogenated solid electrolyte), a conductive material (for example, acetylene black, metal particles, or a conductive polymer), and a binder (for example, styrene butadiene rubber or polyvinylidene fluoride), as needed.

[0031] The solid electrolyte sheet 13 contains a solid electrolyte (e.g., a sulfide solid electrolyte, an oxide solid electrolyte, or a halogenated solid electrolyte) and may further contain a binder (e.g., styrene butadiene rubber or polyvinylidene fluoride) as needed. The composition of the sulfide solid electrolyte is, for example, xLi2S·(100-x)P2S5 (70≦x≦80), yLiI·zLiBr·(100-yz)(xLi2S·(1-x)P2S5) (0.7≦x≦0.8, 0≦y≦30, 0≦z≦30). Examples of oxide solid electrolytes include garnet-type solid electrolytes, perovskite-type solid electrolytes, Nasicon-type solid electrolytes, Li-PO-based solid electrolytes, and Li-BO-based solid electrolytes. Examples of halogenated solid electrolytes include Li 6-3z Z z X6 (X is at least one of Cl and Br, and z is 0) <z<2である)である。

[0032] The negative electrode sheet 14 has a negative electrode current collector 141 and a negative electrode composite layer 142 laminated on both main surfaces of the negative electrode current collector 141. The material of the negative electrode current collector 141 is, for example, aluminum, copper, stainless steel, nickel, iron, titanium, or carbon. The negative electrode current collector 141 is, for example, in the form of a foil or a mesh. The negative electrode composite layer 142 contains a negative electrode active material (for example, metallic lithium, graphite, lithium titanate, or elemental Si). The negative electrode composite layer 142 may further contain a solid electrolyte (for example, a sulfide solid electrolyte, an oxide solid electrolyte, or a halogenated solid electrolyte), a conductive material (for example, acetylene black, metal particles, or a conductive polymer), and a binder (for example, styrene butadiene rubber or polyvinylidene fluoride), as necessary.

[0033] (1.1.1.2) A pair of jigs As shown in FIG. 2, each of the first jig 20A and the second jig 20B has a pair of jig plates 21, 22 and a plurality of fasteners 23.

[0034] Each of the pair of jig plates 21, 22 is a flat plate. As shown in Fig. 2, the jig plate 21 has a plurality of fastening through holes H1. The plurality of fastening through holes H1 are formed at both ends of the jig plate 21 in the left-right direction (X-axis direction). The material of the pair of jig plates 21, 22 may be any metal.

[0035] The plurality of fasteners 23 are attached to the plurality of fastening through holes H1 of the jig plate 21 to fasten the pair of jig plates 21, 22. The fasteners 23 are, for example, screws. The fasteners 23 may be made of any material as long as it is metal.

[0036] (1.2) Pressing process In the pressing step, the jig-attached electrode laminate sheet 1 is pressed by a pair of pressing mechanisms 40. The pair of pressing mechanisms 40 are arranged on both sides of the rotary blade 30 in the left-right direction (X-axis direction). At this time, the jig-attached electrode laminate sheet 1 moves relative to the rotary blade 30 along the feed direction D1. The feed direction D1 is the same as the right direction (positive direction of the X-axis). In FIG. 1, reference numeral 31 denotes the rotation axis of the rotary blade 30, and reference numeral D2 denotes the rotation direction of the rotary blade 30.

[0037] As shown in Fig. 4, the pair of pressing mechanisms 40 press regions R40A, R40B of the jig plates 21 of each of the first jig 20A and the second jig 20B against the areas R40A, R40B on the side of the portion (cutting line CC) where the electrode body laminate sheet 10 is to be cut. The position of each of the pair of pressing mechanisms 40 in the left-right direction (X-axis direction) is close to the position of the rotary blade 30. The pressing mechanism 40 has a rolling tool that comes into rolling contact with the jig-attached electrode body laminate sheet 1. The rolling tool is, for example, a cam follower.

[0038] (1.2.1) Pressing device The pressing step is performed using a pressing device 50. As shown in FIG. 5 , the pressing device 50 includes a pressing mechanism 40, a surface pressure sensor 51, a pressure adjustment mechanism 52, an input unit 53, a storage unit 54, and a control device 55.

[0039] The surface pressure sensor 51 measures the surface pressure applied to the electrode assembly laminate sheet 10. The surface pressure sensor 51 is disposed between the jig plate 21 of the first jig 20A and the electrode assembly laminate sheet 10. The surface pressure sensor 51 covers at least an area corresponding to the area R40A of the jig plate 21. The surface pressure sensor 51 may be a known surface pressure sensor. The pressing force adjustment mechanism 52 adjusts the pressing force (hereinafter also referred to as "pressing force") of the pair of pressing mechanisms. The pressing force adjustment mechanism 52 is attached to each of the pair of pressing mechanisms 40. Specifically, the pressing force adjustment mechanism 52 moves the pressing mechanism 40 in a direction to bring the pressing mechanism 40 closer to or away from the jig-attached electrode body laminated sheet 1 in accordance with control from the control device 55. The pressing force adjustment mechanism 52 may be a known pressing force adjustment mechanism, and may include, for example, a cylinder or a spring. Various data is input through the input unit 53. The input unit 53 includes, for example, a keyboard, a numeric keypad, or a mouse. The storage unit 54 stores various types of data. The storage unit 54 includes a main storage device (e.g., a semiconductor memory) and an auxiliary storage device (e.g., a hard disk drive). The storage unit 54 stores various control programs executed by the control device 55, an upper threshold value 541 of the surface pressure applied to the electrode assembly laminate sheet 10, and a lower threshold value 542 of the surface pressure applied to the electrode assembly laminate sheet 10. The control device 55 is a hardware circuit including a processor such as a CPU (Central Processing Unit). The control device 55 controls the surface pressure sensor 51, the pressure adjustment mechanism 52, the input unit 53, and the memory unit 54 by executing a control program stored in the memory unit 54. The control device 55 has a control unit 550. More specifically, the processor of the control device 55 executes the control program stored in the memory unit 54, thereby functioning as the control unit 550.

[0040] The control unit 550 controls the pressing force adjustment mechanism 52 based on the measurement value of the pressing force measured by the surface pressure sensor 51 (hereinafter also simply referred to as the "measurement value"). More specifically, in response to the input unit 53 receiving a user's instruction, the control unit 550 determines whether the measurement value exceeds an upper threshold value 541 and whether the measurement value exceeds a lower threshold value 542. If the control unit 550 determines that the measurement value exceeds the upper threshold value 541, the control unit 550 sends a signal to weaken the pressing force, and the pressing force adjustment mechanism 52 weakens the pressing force. If the control unit 550 determines that the measurement value does not exceed the lower threshold value 542, the control unit 550 sends a signal to increase the pressing force, and the pressing force adjustment mechanism 52 increases the pressing force.

[0041] (1.3) Cutting process 1 and 2, in the cutting process, the electrode assembly laminate sheet 10 included in the jig-attached electrode assembly laminate sheet 1 and exposed from the pair of jigs 20A, 20B is cut and cut with a rotary blade 30. At this time, the jig-attached electrode assembly laminate sheet 1 moves relative to the rotary blade 30 along the feed direction D1. Furthermore, at this time, the jig plate 21 is deformed in direction D3 (see FIG. 1) by the pressure of the pair of pressing mechanisms 40, and the pair of jig plates 21, 22 and the electrode assembly laminate sheet 10 are in physical contact with each other.

[0042] In the cutting step, the rotary blade 30 may be moved relative to the jig-attached electrode laminate sheet 1, which is fixed in position, to cut the electrode laminate sheet 10, or the jig-attached electrode laminate sheet 1 may be moved relative to the rotary blade 30, which is fixed in position, to cut the electrode laminate sheet 10. The electrode laminate sheet 10 may also be cut by moving the jig-attached electrode laminate sheet 1 and the rotary blade 30 relative to each other.

[0043] The size of the rotary blade 30, the number of blades of the rotary blade 30, the rotation speed of the rotary blade 30, and the moving speed of the jig-attached electrode laminate sheet 1 relative to the rotary blade 30 are selected appropriately depending on the size of the electrode laminate sheet 10, etc.

[0044] (1.4) Other manufacturing processes The manufacturing method of the stacked battery according to the embodiment may include other manufacturing steps of the solid-state battery in addition to the preparation step and the cutting step. The other manufacturing steps of the solid-state battery may be any known method.

[0045] (1.5) Action and Effect 1 to 5, the manufacturing method of the stacked battery according to the embodiment includes a preparation step, a pressing step, and a cutting step. In the cutting step, the electrode body laminate sheet 10 exposed from the jig 20A is cut while the pair of jig plates 21, 22 and the electrode body laminate sheet 10 are in physical contact with each other due to the pressing force of the pair of pressing mechanisms 40. As a result, in the manufacturing method of the stacked battery according to the embodiment, even if a gap is formed between the jig plates 21, 22 and the electrode assembly laminate sheet 10 at the center in the left-right direction (X-axis direction) of the jig-attached electrode assembly laminate sheet 1 (for example, when the length of the electrode assembly laminate sheet 10 in the left-right direction (X-axis direction) is relatively long), the electrode assembly laminate sheet 10 exposed from the pair of jigs 20A, 20B is cut in a state where the pair of jig plates 21, 22 and the electrode assembly laminate sheet 10 are in physical contact with each other due to the pressing of the pair of pressing mechanisms 40. Therefore, while the electrode assembly laminate sheet 10 is being cut with the rotary blade 30, the electrode assembly laminate sheet 10 is less likely to vibrate relative to the jig plates 21, 22. As a result, defects are less likely to occur on the cut surfaces of the electrode assembly laminate sheet 10. In other words, the occurrence of defective products is suppressed. Therefore, the manufacturing method of the stacked battery according to the embodiment can suppress a decrease in yield.

[0046] As described with reference to Figures 1 to 5, in the manufacturing method of the stacked battery according to the embodiment, if the control unit 550 determines that the measured value exceeds the upper threshold 541, the pressing force adjustment mechanism 52 weakens the pressing force, and if the control unit 550 determines that the measured value does not exceed the lower threshold 542, the pressing force adjustment mechanism 52 strengthens the pressing force. This keeps the surface pressure of the portion of the electrode assembly laminate sheet 10 being cut by the rotary blade 30 within a predetermined range. Therefore, while the electrode assembly laminate sheet 10 is being cut by the rotary blade 30, the electrode assembly laminate sheet 10 is less likely to vibrate relative to the jig plates 21, 22. As a result, the manufacturing method for a stacked battery according to the embodiment can further suppress a decrease in yield.

[0047] As described with reference to Figures 1 to 5, in the manufacturing method of the stacked battery of the embodiment, the pressing mechanism 40 presses at least the areas R40A, R40B of the jig plates 21, 22 in the vertical direction (Z-axis direction) on the side where the electrode body stacked sheet 10 is to be cut. As a result, the surface pressure at the portion of the electrode body laminate sheet 10 being cut by the rotary blade 30 is likely to be higher than when a region other than regions R40A and R40B is pressed. As a result, while the electrode body laminate sheet 10 is being cut by the rotary blade 30, the electrode body laminate sheet 10 is less likely to vibrate relative to the jig plates 21 and 22. As a result, the manufacturing method for a stacked battery according to the embodiment can further suppress a decrease in yield.

[0048] As described with reference to FIGS. 1 to 5, in the method for manufacturing a stacked battery according to the embodiment, the pressing mechanism 40 has a rolling tool. As a result, the pressing mechanism 40 is more likely to increase the surface pressure of the portion of the electrode body laminate sheet 10 that is being cut by the rotary blade 30, which moves relative to the rotary blade 30, than when the pressing mechanism 40 has a slider that slides in contact with the jig-attached electrode body laminate sheet 10. As a result, while the electrode body laminate sheet 10 is being cut by the rotary blade 30, the electrode body laminate sheet 10 is less likely to vibrate relative to the jig plates 21, 22. As a result, the method for manufacturing a stacked battery according to the embodiment can further suppress a decrease in yield.

[0049] As explained with reference to Figures 1 to 5, in the manufacturing method of the stacked battery according to the embodiment, the jig-attached electrode laminate sheet 1 includes a pair of jigs 20A, 20B, which are arranged in the front-to-rear direction (Y-axis direction) so as to sandwich the portion of the electrode laminate sheet 10 to be cut. This makes it easier to fix the electrode assembly laminate sheet 10 than when the electrode assembly laminate sheet 10 is not fixed by the pair of jigs 20A, 20B. Therefore, while the electrode assembly laminate sheet 10 is being cut by the rotary blade 30, the electrode assembly laminate sheet 10 is less likely to vibrate relative to the jig 20A. In addition, the electrode assembly laminate sheet 10 is more likely to be cut at a predetermined position. As a result, the manufacturing method of a stacked battery according to the embodiment can further suppress a decrease in yield.

[0050] (2) Variations In the manufacturing method of the stacked battery according to the embodiment, the pressing step is performed using a pressing device, but may be performed without using a pressing device. In the manufacturing method of the stacked battery according to the embodiment, the pressing mechanism 40 presses at least the regions R40A and R40B of the jig plates 21 and 22, but it is not necessary to press the regions R40A and R40B. In the manufacturing method of the stacked battery according to the embodiment, the pressing mechanism 40 has a rolling tool, but may also have a sliding tool that comes into sliding contact with the jig-attached electrode body laminate sheet 10. In the manufacturing method of the stacked battery according to the embodiment, the jig-attached electrode laminate sheet 1 includes the second jig 20B, but does not necessarily have to include the second jig 20B. In the manufacturing method of the laminated battery according to the embodiment, the electrode laminate sheet 10 is a sheet for a solid battery, but may also be a sheet for a non-aqueous electrolyte battery using a non-aqueous electrolyte. In the manufacturing method of the stacked battery according to the embodiment, the stacked battery is a lithium ion secondary battery, but it may also be a metal ion secondary battery (for example, a sodium ion secondary battery, a magnesium ion secondary battery, etc.). [Explanation of symbols]

[0051] 1: electrode body laminated sheet with jig, 10: electrode body laminated sheet, 11: unit electrode sheet, 12: positive electrode sheet, 13: solid electrolyte sheet, 14: negative electrode sheet, 20A, 20B: jig, 21, 21, 22: jig plate, 23: fastener, 24: pressing tool, 25: plate, 30: rotary blade, 31: rotary blade rotation axis

Claims

1. preparing an electrode assembly laminate sheet with a jig, the electrode assembly laminate sheet including at least one unit electrode sheet formed by laminating a positive electrode sheet, an insulating sheet, and a negative electrode sheet in this order along a first direction, and at least one jig for holding partial areas of both surfaces of the electrode assembly laminate sheet in the first direction; pressing the jig-attached electrode laminate sheet, which moves relative to the rotary blade along a second direction perpendicular to the first direction, with a pair of pressing mechanisms arranged on both sides of the position of the rotary blade in the second direction; cutting, with the rotary blade, a portion of the electrode laminate sheet that is included in the jig-attached electrode laminate sheet that moves relative to the rotary blade and is exposed from the jig; Including, The jig is A pair of jig plates covering partial areas of both surfaces; a plurality of fasteners that are arranged at both ends of the pair of jig plates in the second direction and fasten the pair of jig plates together; In the cutting step, the electrode assembly laminate sheet exposed from the jig is cut while the pair of jig plates and the electrode assembly laminate sheet are in physical contact with each other by pressing the pair of pressing mechanisms.

2. the pressing is performed using a pressing device; The pressing device is The pressing mechanism; A surface pressure sensor that measures a surface pressure applied to the electrode laminate sheet; a pressure adjustment mechanism for adjusting the pressing force of the pair of pressing mechanisms; A control unit that controls the pressure adjustment mechanism based on a measured value of the surface pressure measured by the surface pressure sensor, In the pressing, the control unit determines whether or not the measurement value exceeds an upper limit threshold and whether or not the measurement value exceeds a lower limit threshold; When the control unit determines that the measured value exceeds the upper limit threshold, the pressing force adjustment mechanism reduces the pressing force, The method for manufacturing a stacked battery according to claim 1 , wherein the pressure adjustment mechanism increases the pressing force when the control unit determines that the measured value does not exceed the lower threshold value.

3. 3. The method for manufacturing a stacked battery according to claim 1, wherein the pressing mechanism presses at least an area of ​​the jig plate on a side where the electrode body laminate sheet is to be cut, in a third direction perpendicular to each of the first direction and the second direction.

4. The method for manufacturing a stacked battery according to claim 1 or 2, wherein the pressing mechanism has a rolling tool that comes into rolling contact with the jig-attached electrode assembly laminate sheet.

5. The jig-attached electrode laminate sheet includes a pair of the jigs, 3. The method for manufacturing a stacked battery according to claim 1, wherein the pair of jigs are arranged to sandwich a portion of the electrode assembly laminate sheet to be cut in a third direction perpendicular to each of the first direction and the second direction.

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