Press-breaking device, laminated electrode manufacturing method, and laminated battery manufacturing method

Abstract

To provide a pressing and cutting device which can separate lamination type electrode sheets into the desired dimensions by suppressing the occurrence of interlayer short circuits and cracks.SOLUTION: A pressing and cutting device according to the present disclosure includes a placement table on which lamination type electrode sheets are placed, a pressing mechanism which presses the lamination type electrode sheets, and at least one cutting blade tool. The pressing and cutting device according to the present disclosure presses, bends and breaks a portion of protruding portions protruding from the placement table and the pressing mechanism of the lamination type electrode sheets pressed by the pressing mechanism in the second direction orthogonal to the first direction with the cutting blade tool that moves along the first direction relative to the placement table. The angle of a blade part of the cutting blade tool relative to the second direction is between 15° and 30°. The angle of the blade part relative to the first direction is an acute angle. The length in the second direction of a clearance between the blade part and the end on the cutting blade tool side of the placement table is 10% to 35% of the length in the first direction of the lamination type electrode sheets.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a press-breaking device, a method for manufacturing a stacked electrode, and a method for manufacturing a stacked battery. [Background technology]

[0002] In recent years, there has been an increasing demand for high-output lithium secondary batteries as large-scale energy sources for electric vehicles, etc. In general, in the manufacture of lithium secondary batteries, in order to improve the energy density, portions that do not function as power generating elements of the lithium secondary battery (for example, portions with imperfect coating, portions with misaligned lamination, etc.) are cut off.

[0003] Patent Document 1 discloses an electrode cutting device. The cutting device disclosed in Patent Document 1 cuts a sheet-like electrode having an active material layer provided on a foil-like current collector by a shearing action based on the meshing of a lower blade and an upper blade, which are straight-blade blades arranged opposite to each other, as they move toward and away from each other. The upper blade has a cutting edge at the outer corner formed by the blade side and the workpiece contact surface. The cutting edge angle of this cutting edge is set to 90°. The upper blade has a specific flank. Specifically, there is no clearance between the lower blade and the upper blade.

[0004] 11A to 11C show the operating process of the cutting device disclosed in Patent Document 1. In Figures 11A to 11C, reference numeral 901 denotes a current collector, reference numeral 902 denotes an active material layer, and reference numeral 903 denotes an active material layer.

[0005] In Patent Document 1, an electrode base material 900 is disposed between an upper blade 910 and a lower blade 920 that are spaced apart in the vertical direction, and the electrode base material 900 is separated into a first electrode 900A and a second electrode 900B by lowering the upper blade 910. Specifically, when the upper blade 910 is lowered, the upper blade 910 comes into contact with the electrode base material 900, as shown in FIG. 11A. Then, as shown in FIG. 11B, the upper blade 910 presses down the electrode base material 900. Then, as shown in FIG. 11C, the cutting edge 911 of the upper blade 910 comes into engagement with the cutting edge 921 of the lower blade 920. At this time, an electrode 930 is cut from the electrode base material 900 by a shearing action based on the engagement between the cutting edge 911 of the upper blade 910 and the cutting edge 921 of the lower blade 920. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-153538 Summary of the Invention [Problem to be solved by the invention]

[0007] However, when cutting the electrode base material 900 using the cutting device disclosed in Patent Document 1, as shown in Figures 11B and 11C, there is a risk that the sheared surface S900A of the first electrode 900A and the blade side surface S910 of the upper blade 910 may rub against each other. Furthermore, there is a risk that the sheared surface S900A of the first electrode 900A and the sheared surface S900B of the second electrode 900B may rub against each other. This may cause the constituent layers of the first electrode 900A to mix with each other on the surface of the sheared surface S900A of the first electrode 900A, resulting in a risk of a short circuit between the constituent layers of the first electrode 900A (hereinafter also referred to as an "interlayer short circuit").

[0008] 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 press-splitting device that can separate a laminated electrode sheet into desired dimensions while suppressing the occurrence of interlayer short circuits and cracks, a method for manufacturing a laminated electrode, and a method for manufacturing a laminated battery. [Means for solving the problem]

[0009] The means for solving the above problems include the following embodiments.

[0010] <1> The press-breaking device according to the first aspect of the present disclosure is a mounting table on which the laminated electrode sheet is placed; a pressing mechanism that presses the laminated electrode sheet placed on the mounting table; at least one cutting tool; Equipped with A press-breaking device that uses the at least one cutting blade tool that moves relative to the mounting table along a first direction to press and bend a part of a protruding portion of the laminated electrode sheet that protrudes from the mounting table and the pressing mechanism in the second direction perpendicular to the first direction, and breaks the part, The angle of the cutting edge of the cutting tool with respect to the second direction is 15° to 30°, the angle of the blade portion with respect to the first direction is an acute angle, In the press-cutting device, the length in the second direction of the clearance between the blade portion and the cutting blade tool side end of the mounting table is 10% to 35% of the length in the first direction of the laminated electrode sheet.

[0011] A "laminated electrode sheet" has at least a first active material sheet, a second active material sheet, and an insulating sheet that electrically insulates the first active material sheet and the second active material sheet. The insulating sheet is interposed between the first active material sheet and the second active material sheet in a first direction. The "cutting edge" consists of the rake face of the cutting edge tool and the flank face of the cutting edge tool.

[0012] In a first aspect, when separating a laminated electrode sheet into at least two pieces, a cutting tool moving along a first direction relative to the mounting table comes into contact with the protruding portion of the laminated electrode sheet pressed by the pressing mechanism and bends the protruding portion. The blade of the cutting tool bites into the surface of the protruding portion while the protruding portion is bent. When the cutting tool further moves along the first direction, a crack originates from the portion of the protruding portion where the blade of the cutting tool has bitten into it (hereinafter also referred to as the "bite line"), and a part of the protruding portion is separated. This results in a laminated electrode in which the end of the laminated electrode sheet facing the cutting tool (hereinafter referred to as the "waste material") is separated. In the first aspect, the angle of the cutting edge of the cutting tool relative to the second direction (hereinafter also referred to as the "rake angle") is 15° or less. This makes it easier for the cutting edge of the cutting tool to bite into the protruding portion than when the rake angle is less than 15°. As a result, cracks are more likely to occur in the protruding portion starting from the bite line. In other words, the shape of the end of the resulting laminated electrode on the cutting edge tool side when viewed from the first direction is less likely to be sawtooth. As a result, the press-cutting device of the first aspect can separate the laminated electrode sheet into desired dimensions. In the first embodiment, the rake angle is 30° or less. This makes it less likely that the blade of the cutting tool will bite into the protruding portion than when the rake angle is greater than 30°. Therefore, the sharp blade itself is less likely to cut off the protruding portion. In other words, when part of the protruding portion is separated, the blade of the cutting tool and the separated surface of the protruding portion are less likely to rub against each other. As a result, the press-cutting device of the first embodiment can suppress the occurrence of interlayer short circuits. In the first embodiment, the angle of the cutting edge of the cutting tool relative to the first direction (hereinafter also referred to as the "relief angle") is an acute angle. This makes it less likely that the separation surface of the resulting laminated electrode will rub against the cutting tool than when the relief angle is not acute. As a result, the press-splitting device of the first embodiment can suppress the occurrence of interlayer short circuits. In the first embodiment, the length in the second direction of the clearance between the blade portion and the end of the mounting table on the cutting tool side (hereinafter also referred to as the "clearance length") is 10% or more of the length in the first direction of the laminated electrode sheet. This makes it easier for the protruding portion to be pressed and bent by the moving cutting tool than when the clearance length is less than 10% of the length in the first direction of the laminated electrode sheet. Therefore, in the process of separating the waste material from the laminated electrode sheet, the separation surface of the laminated electrode is less likely to rub against the cutting tool and the waste material. As a result, the press-splitting device of the first embodiment can suppress the occurrence of interlayer short circuits. In the first aspect, the length of the clearance is 35% or less of the length of the laminated electrode sheet in the first direction. This reduces the bending moment around the portion of the protruding portion near the edge of the mounting base on the cutting tool side compared to when the clearance is more than 35% of the length of the laminated electrode sheet in the first direction. In other words, when the moving cutting tool presses and bends the protruding portion, stress is less likely to concentrate on the portion of the laminated electrode sheet near the edge of the pressing mechanism on the cutting tool side. Therefore, cracks are less likely to occur on the surface of the portion of the laminated electrode sheet near the edge of the pressing mechanism on the cutting tool side. If a crack occurs in the laminated electrode, the laminated electrode may break during charging and discharging. As described above, the press-cutting device of the first aspect can separate the laminated electrode sheet into pieces of desired dimensions while suppressing the occurrence of interlayer short circuits and cracks.

[0013] <2> The press-breaking device according to the second aspect of the present disclosure is the pressing mechanism has a contact member that comes into contact with the laminated electrode sheet when pressing the laminated electrode sheet, In the second direction, the position of the end of the contact member on the cutting edge tool side is the same position as the position of the end of the table on the cutting edge tool side, or is a position closer to the cutting edge tool than the position of the end of the table on the cutting edge tool side. <1> 2. The press-breaking device according to claim 1.

[0014] In the second aspect, when the moving cutting blade tool presses and bends the protruding portion, stress is less likely to concentrate in a portion of the laminated electrode sheet near the cutting blade tool-side end of the pressing mechanism than when the cutting blade tool-side end of the contact member is positioned on the opposite side of the cutting blade tool side from the cutting blade tool-side end of the mounting table in the second direction. As a result, the press-splitting device of the second aspect can separate the laminated electrode sheet while further suppressing the occurrence of cracks.

[0015] <3> A press-breaking device according to a third aspect of the present disclosure is The angle of the blade with respect to the first direction is 5° to 15°. <1> or <2> 2. The press-breaking device according to claim 1.

[0016] In the third embodiment, the laminated electrode obtained by separating the waste material is less likely to rub against the cutting tool than when the clearance angle is outside the range of 5° to 15°. As a result, the press-splitting device of the third embodiment can separate the laminated electrode sheet while further suppressing the occurrence of interlayer short circuits.

[0017] <4> A fourth aspect of the present disclosure of a press-breaking device is The length of the clearance in the second direction is 20 μm to 50 μm. <1> ~ <3> The press-breaking device is described in any one of the above.

[0018] The press-breaking device of the fourth embodiment can separate the specific laminated electrode sheet into desired dimensions while suppressing the occurrence of interlayer short circuits and cracks more than when the clearance length is outside the range of 20 μm to 50 μm. The specific laminated electrode sheet is formed by laminating a first active material layer, a solid electrolyte layer, and a second active material layer in this order along a first direction on both sides of a first current collector. The length (thickness) of the specific laminated electrode sheet in the first direction is, for example, 0.2 mm.

[0019] <5> A press-breaking device according to a fifth aspect of the present disclosure is a lower mold holder; and an upper mold holder disposed opposite the lower mold holder and movable relative to the lower mold holder along the first direction, the first direction is parallel to the direction of gravity, The cutting tool and the pressing mechanism are attached to the upper die holder, The mounting table is attached to the lower mold holder. <1> ~ <4> The press-breaking device is described in any one of the above.

[0020] In a fifth aspect, a laminated electrode sheet is placed between a cutting tool and a mounting table that are spaced apart in a first direction, and the upper holder is lowered to press and restrain the laminated electrode sheet with a pressing mechanism, so that a part of the protruding portion of the laminated electrode sheet can be separated. As a result, the press-splitting device of the fifth aspect can efficiently separate the laminated electrode sheet with a simple configuration.

[0021] <6> A press-breaking device according to a sixth aspect of the present disclosure is The cutting edge tool is an upper cutting edge, The mounting base is a lower blade. <5> 2. The press-breaking device according to claim 1.

[0022] The press-cutting device of the sixth aspect can efficiently separate the laminated electrode sheet.

[0023] <7> A method for producing a laminated electrode according to a seventh aspect of the present disclosure includes: The aforementioned <1> ~ <6> A method for manufacturing a laminated electrode using the press-breaking device according to any one of the above, preparing the laminated electrode sheet; placing the laminated electrode sheet on the mounting table so that the protruding portion is formed; and moving the at least one cutting edge tool in the first direction to bend and split the protruding portion of the laminated electrode sheet.

[0024] A "laminated electrode" refers to an electrode formed by laminating a first active material layer, a first insulating layer, a second active material layer, and a second current collector, in this order, on both sides of a first current collector, along the first direction. The first current collector sheet, the first active material sheet, the insulating sheet, and the second active material sheet included in the laminated electrode sheet are split to form the first current collector, the first active material layer, the insulating layer, and the second active material layer included in the laminated electrode. An "insulating layer" includes a solid electrolyte layer of a lithium secondary battery using a solid electrolyte and a separator of a lithium secondary battery using a nonaqueous electrolyte.

[0025] The electrode manufacturing method of the seventh embodiment can manufacture a laminated electrode sheet having desired dimensions while further suppressing the occurrence of interlayer short circuits and cracks.

[0026] <8> An eighth aspect of the present disclosure provides a method for producing a laminated electrode, comprising: the laminated electrode sheet is formed by laminating a first active material sheet, a solid electrolyte sheet, and a second active material sheet in this order on both sides of a first current collector sheet along the first direction; The method further includes laminating a second current collector on a second active material layer obtained from the second active material sheet by performing the pressing and splitting. <7> 2. A method for producing the electrode according to claim 1.

[0027] The eighth embodiment of the method for manufacturing a laminated electrode can manufacture a laminated electrode having desired dimensions while suppressing the occurrence of interlayer short circuits and cracks.

[0028] <9> A ninth aspect of the present disclosure provides a method for producing a stacked battery, comprising: The aforementioned <7> or <8> 10. A method for producing a stacked battery, comprising producing a stacked electrode by the method for producing a stacked electrode according to claim 19.

[0029] "Stacked battery" refers to a battery that includes at least one stacked electrode.

[0030] The manufacturing method of the stacked battery of the ninth aspect can manufacture a stacked battery that is suppressed from causing interlayer short circuits and cracks and that includes stacked electrodes having desired dimensions. [Effects of the Invention]

[0031] According to the present disclosure, there are provided a press-splitting device capable of separating a laminated electrode sheet into desired dimensions while suppressing the occurrence of interlayer short circuits and cracks, a method for manufacturing a laminated electrode, and a method for manufacturing a laminated battery. [Brief explanation of the drawings]

[0032] [Figure 1] FIG. 1 is a cross-sectional view of a push-cutting device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view of an upper blade and a lower blade in an embodiment of the present disclosure. [Figure 3] FIG. 3 is a cross-sectional view of a push-cutting device according to an embodiment of the present disclosure. [Figure 4] FIG. 4 is a cross-sectional view of an upper blade and a lower blade in an embodiment of the present disclosure. [Figure 5] FIG. 5 is a cross-sectional view of an upper blade and a lower blade in an embodiment of the present disclosure. [Figure 6] FIG. 6 is a cross-sectional view of a push-cutting device according to an embodiment of the present disclosure. [Figure 7] FIG. 7 is a cross-sectional view of an upper blade and a lower blade in an embodiment of the present disclosure. [Figure 8] FIG. 8 is a cross-sectional view of a laminated electrode sheet according to an embodiment of the present disclosure. [Figure 9] FIG. 9 is a top view of a laminated electrode of a comparative example. [Figure 10] FIG. 10 is a top view of a laminated electrode of a comparative example. [Figure 11A] FIG. 11A is a diagram illustrating the operation process of a conventional cutting device. [Figure 11B] FIG. 11B is a diagram illustrating the operation process of the conventional cutting device. [Figure 11C]FIG. 11C is a diagram illustrating the operation process of a conventional cutting device. DETAILED DESCRIPTION OF THE INVENTION

[0033] 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 numerical ranges described in stages in the present disclosure, the upper or lower limit value described in a certain numerical range may be replaced with the upper or lower limit value of another numerical range described in stages. In the present disclosure, a combination of two or more preferred embodiments is a more preferred embodiment. In the present disclosure, the term "process" includes not only an independent process, but also a process that cannot be clearly distinguished from other processes, as long as the intended purpose of the process is achieved.

[0034] Hereinafter, embodiments of the press-breaking device, the method for manufacturing a stacked electrode, and the method for manufacturing 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.

[0035] (1) Press-breaking device The press-breaking device 1 according to an embodiment of the present disclosure presses and bends the laminate electrode sheet 4 to break the laminate electrode sheet 4. This results in a laminate electrode precursor 40. The laminate electrode precursor 40 is obtained by removing portions 41 (hereinafter also referred to as "waste material 41") that do not function as power generating elements from the laminate electrode sheet 4. Details of the laminate electrode sheet 4 will be described later.

[0036] As shown in Fig. 1, the press-breaking device 1 includes an upper die 2 and a lower die 3. The upper die 2 is disposed opposite the lower die 3. The upper die 2 is movable relative to the lower die 3 in the direction of gravity. The upper die 2 has two linear upper blades 21, which are an example of at least one cutting blade tool.

[0037] In this embodiment, the direction of gravity is defined as the lower side, and the opposite side is defined as the upper side. One side of the two upper blades 21 is defined as the right side, and the opposite side is defined as the left side. One side of the longitudinal direction of the upper blade 21 is defined as the front side, and the opposite side is defined as the rear side. The up-down direction, which is an example of the first direction, the left-right direction, which is an example of the second direction, and the front-rear direction are perpendicular to each other. Note that these directions do not limit the orientation of the pressing and splitting device of the present disclosure when in use.

[0038] (1.1) Upper mold The upper die 2 has two upper blades 21, a pressing mechanism 22, multiple guide pins 23, and an upper die holder 24. The two upper blades 21, the pressing mechanism 22, and multiple guide pins 23 are attached to the upper die holder 24. The pressing mechanism 22 is located in the center of the upper die holder 24 in the left-right direction. The two upper blades 21 are located on both sides of the pressing mechanism 22 in the left-right direction. The multiple guide pins 23 are located outside the pressing mechanism 22 in the left-right direction.

[0039] (1.1.1) Upper blade As shown in Figure 2, the upper blade 21 is wedge-shaped. The upper blade 21 has a cutting edge 210 that extends in the front-to-rear direction. The upper blade 21 is formed with a rake face S210A and a flank S210B. The cutting edge 210 is made up of the rake face S210A and the flank S210B.

[0040] The angle θA of the cutting edge 210 of the upper blade 21 relative to the left-right direction (hereinafter also referred to as "rake angle θA") is 15° to 30°.

[0041] The angle θB of the cutting edge 210 of the upper blade 21 relative to the vertical direction (hereinafter also referred to as "clearance angle θB") is an acute angle. In the press-breaking device 1, the clearance angle θB is 5° to 15°.

[0042] The length of the upper blade 21 in the front-rear direction is appropriately selected depending on the size of the laminated electrode sheet 4, etc., and may be longer than the length of the laminated electrode sheet 4 in the front-rear direction. The material of the upper blade 21 is not particularly limited and may be appropriately selected depending on the type of the laminated electrode sheet 4, etc., and examples thereof include steel and superhard metal.

[0043] (1.1.2) Pressing mechanism The pressing mechanism 22 presses the laminated electrode sheet 4 placed on the lower blade 31 included in the lower mold 3. The pressing mechanism 22 has a contact member 221 and an elastic member 222. An upper end of the elastic member 222 is fixed to the upper mold holder 24. A lower end of the elastic member 222 is fixed to the contact member 221.

[0044] The contact member 221 comes into contact with the laminated electrode sheet 4 when the pressing mechanism 22 presses the laminated electrode sheet 4. The contact member 221 is a flat plate. The left-right length L1 (see FIG. 1) of the contact member 221 is shorter than the left-right length L2 (see FIG. 1) of the laminated electrode sheet 4, and is selected appropriately depending on the length L2 of the laminated electrode sheet 4. The material of the contact member 221 is not particularly limited, and examples include resin and metal.

[0045] The elastic member 222 applies a biasing force to the contact member 221 when the pressing mechanism 22 presses the laminated electrode sheet 4. The vertical length of the elastic member 222 may be such that the position of the lower BS221 of the contact member 221 is lower than the position of the lower BS21 of the upper blade 21 when the contact member 221 is not in contact with the laminated electrode sheet 4. The elastic member 222 may be any member that is expandable and contractible in the vertical direction, such as a coil spring. The material of the elastic member 222 is not particularly limited, and examples thereof include resin and metal.

[0046] (1.1.3) Guide pin The guide pins 23 are used to vertically control the direction in which the upper mold 2 moves relative to the lower mold 3. Each of the multiple guide pins 23 extends downward from the lower surface S24 of the upper mold holder 24. The number of guide pins 23 needs to be at least two, and is selected appropriately depending on the size of the laminated electrode sheet 4. The material of the guide pins 23 is not particularly limited, and examples include resin and metal.

[0047] (1.1.4) Upper die holder The upper die holder 24 holds the two upper blades 21, the pressing mechanism 22, and a plurality of guide pins 23. The upper die holder 24 is a plate-like object. The material of the upper die holder 24 is appropriately selected depending on the size of the laminated electrode sheet 4, etc. The material of the upper die holder 24 is not particularly limited, and examples thereof include resin and metal.

[0048] (1.2) Lower mold The lower mold 3 has a lower blade 31, which is an example of a mounting base, and a lower mold holder 32. The lower blade 31 is attached to the lower mold holder 32. The lower blade 31 is located in the center of the lower mold holder 32 in the left-right direction.

[0049] (1.2.1) Lower blade The lower blade 31 is a plate-like member and has a linear blade portion 310 extending in the front-rear direction. The lower blade 31 has an end surface S310A and a contact surface S310B that comes into contact with the laminated electrode sheet 4. The blade portion 310 is made of the end surface S310A and the contact surface S310B. The angle θC formed between the end surface S310A and the contact surface S310B is 90°. The length of the lower blade 31 in the front-rear direction is selected appropriately depending on the size of the laminated electrode sheet 4, and it is sufficient that the length is longer than the length of the laminated electrode sheet 4 in the front-rear direction. The material of the lower blade 31 is not particularly limited and can be selected appropriately depending on the type of laminated electrode sheet 4, and examples include steel and cemented carbide.

[0050] (1.2.2) Lower die holder The lower die holder 32 holds the lower blade 31. The lower die holder 32 is a plate-like object. A plurality of guide holes H32 are formed in the lower die holder 32. The guide pins 23 of the upper die 2 are inserted into the guide holes H32. The guide holes H32 are formed in the vertical direction and pass through the lower die holder 32. The positions of the plurality of guide holes H32 correspond to the positions of the plurality of guide pins 23. The material of the lower die holder 32 is not particularly limited, and examples include resin and metal.

[0051] (1.3) Layout The length L3 (see FIG. 2) in the left-right direction of the clearance between the blade portion 210 of the upper blade 21 and the end of the lower blade 31 on the upper blade 21 side (i.e., the blade portion 310) is 10% to 35% of the length L4 (see FIG. 2) in the left-right direction of the laminated electrode sheet 4. In other words, in the press-cutting device 1, the length L3 of the clearance is 20 μm to 50 μm.

[0052] In the left-right direction, the position of the end 2210 of the contact member 221 on the upper blade 21 side is the same as the position of the end of the lower blade 31 on the upper blade 21 side (ie, the blade portion 310).

[0053] (1.4) Driving means The press-breaking device 1 may or may not be equipped with a known driving means (for example, a hydraulic cylinder, a driving motor, etc.). When the press-breaking device 1 is equipped with a driving means, the upper mold 2 may be moved relative to the lower mold 3 by the driving means. When the press-breaking device 1 is not equipped with a driving means, the upper mold 2 may be moved relative to the lower mold 3 manually.

[0054] (1.5) Operation The operation of the press-breaking device 1 will be described with reference to FIGS.

[0055] First, as shown in FIG. 1, the upper mold 2 and the lower mold 3 are vertically spaced apart, and the laminated electrode sheet 4 is placed on the lower blade 31 of the lower mold 3 . Next, when the upper mold 2 is moved downward, each of the plurality of guide pins 23 of the upper mold 2 is inserted into each of the plurality of guide holes H32 of the lower mold 3. When the upper mold 2 is moved further downward, the contact member 221 of the pressing mechanism 22 comes into contact with the laminate electrode sheet 4, as shown in FIGS. 2 and 3. As a result, the contact member 221 of the pressing mechanism 22 presses and restrains the laminate electrode sheet 4 by the biasing force of the elastic member 222. At this time, as shown in FIG. 2, both left and right end portions R4 of the laminate electrode sheet 4 (hereinafter also referred to as "protruding portions R4") protrude from the contact member 221 of the pressing mechanism 22 and the lower blade 31. At this point, the upper blade 21 is not in contact with the laminate electrode sheet 4. Next, when the upper die 2 is further moved downward, the blade portion 210 of the upper blade 21 comes into contact with the protruding portion R4 of the laminated electrode sheet 4 restrained by the pressing mechanism 22. Next, when the upper mold 2 is moved further downward, as shown in Fig. 4, the protruding portion R4 is pressed downward by the pressure of the upper blade 21, following the movement of the upper blade 21. At this time, the blade portion 210 of the upper blade 21 bites into the upper surface TS4 of the protruding portion R4 while the protruding portion R4 is being pressed and bent. As a result, a bite line X1 is formed on the upper surface TS4 of the protruding portion R4. The bite line X1 extends linearly in the front-to-rear direction from the front end to the rear end of the protruding portion R4. Next, when the upper mold 2 is moved further downward, the crack X2 originating from the bite line X1 of the protruding portion R4 reaches the lower surface BS4 of the protruding portion R4, as shown in Fig. 5. In other words, a crack occurs in the laminated electrode sheet 4 originating from the bite line X1. Next, when the upper mold 2 is moved further downward, the broken material 41 is separated from the laminate electrode sheet 4, as shown in Fig. 6. This results in a laminate electrode precursor 40. When the broken material 41 is separated from the laminate electrode sheet 4, the portion R40 of the laminate electrode precursor 40 that protrudes from the contact member 221 and the lower blade 31 (hereinafter also referred to as the "protruding portion R40") is released from the pressure of the upper blade 21, as shown in Fig. 7, and the laminate electrode sheet 4 deforms to return to the state it was in before being pressed by the upper blade 21.

[0056] (1.6) Laminated electrode sheet 8, the laminated electrode sheet 4 is formed by stacking a negative electrode active material sheet 43, which is an example of a first active material sheet, a solid electrolyte sheet 44, and a positive electrode active material sheet 45, which is an example of a second active material sheet, in this order on both sides of a negative electrode current collector sheet 42, which is an example of a first current collector sheet, in the vertical direction. The laminated electrode sheet 4 does not include a negative electrode current collector sheet on the positive electrode active material sheet 45.

[0057] The laminated electrode sheet 4 has non-functioning regions NR4 (hereinafter also referred to as "non-power generation regions NR4") that do not function as power generation elements at both left and right ends. In the non-power generation regions NR4, the negative electrode active material sheet 43 and the positive electrode active material sheet 45 do not face each other in the vertical direction with the solid electrolyte sheet 44 interposed therebetween.

[0058] The length L4 of the laminated electrode sheet 4 in the up-down direction is, for example, 0.2 mm, and the length of the laminated electrode sheet 4 in the front-rear direction is, for example, 70 mm.

[0059] (1.6.1) Negative electrode current collector sheet Examples of materials for the negative electrode current collector sheet 42 include stainless steel, aluminum, copper, nickel, iron, titanium, and carbon, with copper being preferred. The negative electrode current collector sheet 42 may have a foil or mesh shape, for example. The negative electrode current collector sheet 42 may have a buffer layer, an elastic layer, or a PTC (Positive Temperature Coefficient) thermistor layer disposed on its surface.

[0060] (1.6.2) Negative electrode active material sheet The negative electrode active material sheet 43 contains a negative electrode active material, such as a Li-based active material such as metallic lithium, a carbon-based active material such as graphite, an oxide-based active material such as lithium titanate, or a Si-based active material such as simple silicon.

[0061] The negative electrode active material sheet 43 may contain at least one of a negative electrode solid electrolyte, a conductive additive, and a binder, as needed. Examples of the negative electrode solid electrolyte and binder include the same solid electrolyte and binder as those exemplified in the solid electrolyte layer contained in the solid electrolyte sheet 44 described below.

[0062] Examples of conductive additives include carbon materials, metal materials, and conductive polymer materials. Examples of carbon materials include carbon black (e.g., acetylene black, furnace black, ketjen black, etc.), fibrous carbon (e.g., vapor-grown carbon fiber, carbon nanotube, carbon nanofiber, etc.), graphite, and carbon fluoride. Examples of metallic materials include metal powder (e.g., aluminum powder, etc.), conductive whiskers (e.g., zinc oxide, potassium titanate, etc.), and conductive metal oxides (e.g., titanium oxide, etc.). Examples of conductive polymer materials include polyaniline, polypyrrole, and polythiophene. One type of conductive additive may be used alone, or two or more types may be mixed and used.

[0063] (1.6.3) Solid electrolyte sheet The solid electrolyte sheet 44 preferably includes one selected from the group consisting of a sulfide solid electrolyte, an oxide solid electrolyte, and a halide solid electrolyte.

[0064] The sulfide solid electrolyte preferably contains sulfur (S) as the main anion element, and further preferably contains, for example, Li and / or A. The A element is at least one selected from the group consisting of P, As, Sb, Si, Ge, Sn, B, Al, Ga, and In. The sulfide solid electrolyte may further contain at least one of O and a halogen element. Examples of the halogen element (X) include F, Cl, Br, and I. The composition of the sulfide solid electrolyte is not particularly limited, and examples include xLiS·(100-x)P2S5 (70≦x≦80), yLiI·zLiBr·(100-yz)(xLiS·(1-x)P2S5) (0.7≦x≦0.8, 0≦y≦30, 0≦z≦30). The sulfide solid electrolyte may have a composition represented by the following general formula (1): Formula (1): Li 4-x Ge 1-x P x S4(0 <x<1) In formula (1), at least a portion of the Ge may be substituted with at least one selected from the group consisting of Sb, Si, Sn, B, Al, Ga, In, Ti, Zr, V, and Nb. At least a portion of the P may be substituted with at least one selected from the group consisting of Sb, Si, Sn, B, Al, Ga, In, Ti, Zr, V, and Nb. At least a portion of the Li may be substituted with at least one selected from the group consisting of Na, K, Mg, Ca, and Zn. At least a portion of the S may be substituted with a halogen. The halogen is at least one of F, Cl, Br, and I.

[0065] The oxide solid electrolyte preferably contains oxygen (O) as the main anion element, and may contain, for example, Li, Q element (Q represents at least one of Nb, B, Al, Si, P, Ti, Zr, Mo, W, and S), and O. Examples of the oxide solid electrolyte 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 the garnet-type solid electrolyte include Li7La3Zr2O 12 , Li 7-x La3(Zr 2-x Nb x )O 12 (0≦x≦2), Li5La3Nb2O 12 Examples of perovskite-type solid electrolytes include (Li,La)TiO3, (Li,La)NbO3, (Li,Sr)(Ta,Zr)O3, etc. Examples of Nasicon-type solid electrolytes include Li(Al,Ti)(PO4)3, Li(Al,Ga)(PO4)3, etc. Examples of Li-PO-based solid electrolytes include Li3PO4 and LIPON (a compound in which part of the O in Li3PO4 is substituted with N), and examples of Li-BO-based solid electrolytes include Li3BO3 and a compound in which part of the O in Li3BO3 is substituted with C, etc.

[0066] As the halide solid electrolyte, a solid electrolyte containing Li, M, and X (M represents at least one of Ti, Al, and Y, and X represents F, Cl, or Br) is suitable. 6-3zY z X6 (where X represents Cl or Br, and z satisfies 0 < z < 2), Li 6-(4-x)b (Ti 1-x Al x ) b F6 (0 < x < 1, 0 < b ≤ 1.5) is preferred. Li 6-3z Y z Among X6, Li3YX6 (where X represents Cl or Br) is more preferred in terms of excellent lithium ion conductivity, and further Li3YCl6 is preferred. Also, Li 6-(4-x)b (Ti 1-x Al x ) b F6 (0 < x < 1, 0 < b ≤ 1.5) is preferably included together with a solid electrolyte such as a sulfide solid electrolyte from the viewpoint of, for example, suppressing the oxidative decomposition of the sulfide solid electrolyte.

[0067] The solid electrolyte sheet 44 may have a single-layer structure or a multi-layer structure of two or more layers.

[0068] The solid electrolyte sheet 44 may contain a binder or may not contain a binder. Examples of the binder that can be included in the solid electrolyte sheet 44 include, for example, vinyl halide resins, rubbers, polyolefin resins, etc. Examples of the vinyl halide resin include polyvinylidene fluoride (PVdF), a copolymer of polyvinylidene fluoride and hexafluoropropylene (PVdF-HFP), etc. Examples of the polyolefin resin include, for example, butadiene rubber (BR), acrylate butadiene rubber (ABR), styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), butyl rubber (isobutylene-isoprene rubber), etc. Examples of the polyolefin resin include polyethylene, polypropylene, etc. The binder may be a diene-based rubber containing a double bond in the main chain, for example, a butadiene-based rubber in which butadiene occupies 30 mol% or more of the whole.

[0069] 好ましく、更にはLi3YCl6が好ましい。また、Li (1.6.4) Positive electrode active material sheet The positive electrode active material sheet 45 contains a positive electrode active material. The positive electrode layer may contain at least one of a positive electrode solid electrolyte, a conductive additive, and a binder, as needed.

[0070] The positive electrode active material preferably contains a lithium composite oxide. The lithium composite oxide may contain at least one element selected from the group consisting of F, Cl, N, S, Br, and I. The lithium composite oxide may have a crystal structure belonging to at least one space group selected from the space groups R-3m, Immm, and P63-mmc (also referred to as P63mc or P6 / mmc). The lithium composite oxide may have an O2-type structure in which the transition metal, oxygen, and lithium are primarily arranged.

[0071] Examples of lithium composite oxides having a crystal structure belonging to R-3m include Li x Me y O α X β (Me represents at least one selected from the group consisting of Mn, Co, Ni, Fe, Al, Cu, V, Nb, Mo, Ti, Cr, Zr, Zn, Na, K, Ca, Mg, Pt, Au, Ag, Ru, W, B, Si, and P, and X represents at least one selected from the group consisting of F, Cl, N, S, Br, and I, and satisfy the conditions 0.5≦x≦1.5, 0.5≦y≦1.0, 1≦α<2, and 0<β≦1.)

[0072] Examples of lithium composite oxides having a crystal structure belonging to Immm include Li x1 M 1 A 1 2(1.5≦x1≦2.3, M 1 contains at least one selected from the group consisting of Ni, Co, Mn, Cu and Fe, and A 1 contains at least oxygen, and A 1 The ratio of oxygen in the oxide is 85 atomic % or more. x1 M 1A 1-x2 M 1B x2 O2-y A 2 y (where \(0\leq x2\leq0.5\), \(0\leq y\leq0.3\), at least one of \(x2\) and \(y\) is non-zero, and M 1A represents at least one selected from the group consisting of Ni, Co, Mn, Cu, and Fe, and M 1B represents at least one selected from the group consisting of Al, Mg, Sc, Ti, Cr, V, Zn, Ga, Zr, Mo, Nb, Ta, and W, and A2 represents at least one selected from the group consisting of F, Cl, Br, S, and P.) Examples include composite oxides represented by the formula.

[0073] Examples of the lithium composite oxide having a crystal structure belonging to P63 - mmc include, for example, M1 x M2 y O2 (where M1 represents an alkali metal (at least one of Na and K is preferred), M2 represents a transition metal (at least one selected from the group consisting of Mn, Ni, Co, and Fe is preferred), and \(x + y\) satisfies \(0 < x + y\leq2\).) Examples include composite oxides represented by the formula.

[0074] Examples of the lithium composite oxide having an O2 - type structure include, for example, Li x [Li α (Mn a Co b M c ) 1-α O2 (\(0.5 < x < 1.1\), \(0.1 < α < 0.33\), \(0.17 < a < 0.93\), \(0.03 < b < 0.50\), \(0.04 < c < 0.33\), and M represents at least one selected from the group consisting of Ni, Mg, Ti, Fe, Sn, Zr, Nb, Mo, W, and Bi.) Examples include composite oxides represented by the formula, and specific examples include Li 0.744 [Li 0.145 Mn 0.625 Co 0.115 Ni 0.115 O2 etc.

[0075] The positive electrode solid electrolyte preferably includes one selected from the group consisting of a sulfide solid electrolyte, an oxide solid electrolyte, and a halide solid electrolyte. Examples of the sulfide solid electrolyte include the same as those exemplified as the sulfide solid electrolyte contained in the solid electrolyte. Examples of the oxide solid electrolyte include the same as those exemplified as the oxide solid electrolyte contained in the solid electrolyte. Examples of the halide solid electrolyte include the same as those exemplified as the halide solid electrolyte contained in the solid electrolyte.

[0076] Examples of the binder include the same binders as those exemplified as the binder contained in the solid electrolyte layer.

[0077] (1.7) Action and Effect As described with reference to FIGS. 1 to 7, the press-breaking device 1 includes a lower blade 31, a pressing mechanism 22, and two upper blades 21. The press-breaking device 1 uses the two upper blades 21, which move vertically relative to the lower blade 31, to press and bend a portion of the protruding portion R4 of the laminated electrode sheet 4 pressed by the pressing mechanism 22 to break it. The rake angle θA is 15° to 30°. The relief angle θB is an acute angle. The clearance length L3 is 10% to 35% of the length L4 of the laminated electrode sheet 4. As a result, the press-cutting device 1 can prevent the occurrence of interlayer short circuits and cracks, and can separate the laminated electrode sheet 4 into pieces of desired dimensions.

[0078] The inventors cut the laminated electrode sheet 4 using a device similar to the press-cutting device 1, except that the rake angle θA was changed to less than 15° (specifically, 0°, 5°, or 10°). A top view of the cut portion of the cut laminated electrode sheet 4 is shown in FIG. 9. As shown in FIG. 9, the edge shape D1 of the cut portion of the laminated electrode was found to be sawtooth-shaped. In the left-right direction, the distance L5 between the peaks of the convex portions and the valley bottoms of the concave portions of the shape D1 of the edge of the cut portion of the laminated electrode was not less than 100 μm. This is presumably due to the following reason. That is, when the rake angle θA is less than 15°, the cutting edge 210 of the upper blade 21 has difficulty penetrating the protruding portion R4, making it difficult to stably form a linear penetration line X1. As a result, no cracks originating from the penetration line X1 occurred. Therefore, it is presumed that the edge shape D1 of the cut portion of the laminated electrode was sawtooth-shaped. As a result, it was experimentally found that if the rake angle θA is less than 15°, the laminated electrode sheet 4 is difficult to separate into desired dimensions.

[0079] The present inventors cut the laminate electrode sheet 4 using a device similar to the press-cutting device 1, except that the rake angle θA was changed to greater than 30° (specifically, 45° or 60°). When the cut surface of the cut laminate electrode sheet 4 was visually observed, the boundaries between the layers constituting the laminate electrode sheet 4 could not be clearly identified. This is presumably due to the following reason. That is, the blade portion 210 of the upper blade 21 press-cuts the protruding portion R4, and during this process, the blade portion 210 of the upper blade 21 rubs against the separation surface S40 of the laminate electrode precursor 40. As a result, it was experimentally found that when the rake angle θA is greater than 30°, the laminate electrode sheet 4 is difficult to separate, suppressing the occurrence of interlayer short circuits.

[0080] The inventors cut a laminate electrode sheet 4 using a device similar to the press-cutting device 1, except that the clearance angle was changed to 0°. Visual observation of the cut surface of the cut laminate electrode sheet 4 revealed that the boundaries between the layers constituting the laminate electrode sheet 4 could not be discerned. Furthermore, powder derived from the material of the laminate electrode sheet 4 was scattered on the floor near the device. This is presumably due to the blade portion 210 of the upper blade 21 rubbing against the separation surface S40 of the laminate electrode precursor 40 after the waste material 41 was separated from the laminate electrode sheet 4. Experiments have shown that when the clearance angle is not acute, the laminate electrode sheet 4 is difficult to separate, suppressing the occurrence of interlayer short circuits.

[0081] The present inventors cut the laminate electrode sheet 4 using a device similar to the press-cutting device 1, except that the clearance length L3 was set to less than 10% of the length L4 of the laminate electrode sheet 4. When the cut surface of the cut laminate electrode sheet 4 was visually observed, the boundaries between the layers constituting the laminate electrode sheet 4 could not be clearly distinguished. This is presumably because the protruding portion R4 was cut without being pressed and bent by the upper blade 21, and the separation surface S40 of the laminate electrode precursor 40 rubbed against the upper blade 21 and the waste material 41. As a result, it was experimentally found that when the clearance length L3 was less than 10% of the length L4 of the laminate electrode sheet 4, the laminate electrode sheet 4 was difficult to separate, suppressing the occurrence of interlayer short circuits.

[0082] The inventors cut the laminate electrode sheet 4 using a device similar to the press-cutting device 1, except that the clearance length L3 was set to more than 35% of the length L4 of the laminate electrode sheet 4. A top view of the cut portion of the cut laminate electrode sheet 4 is shown in FIG. 10. As shown in FIG. 10, a crack D2 was confirmed in the left-right direction at a position a distance L6 (approximately 70 μm) from the edge of the cut portion on the surface of the laminate electrode sheet 4 toward the center. The crack D2 extended linearly in the front-rear direction. This is presumably because stress concentrated in a region CR4 near the edge 2210 of the pressing mechanism 22 on the upper blade 21 side of the laminate electrode sheet 4 when the moving upper blade 21 pressed and bent the protruding portion R4. Experiments have shown that when the clearance length L3 is more than 35% of the length L4 of the laminate electrode sheet 4, the laminate electrode sheet 4 is less susceptible to cracking and is less likely to be separated.

[0083] 1 to 7, in the press-breaking device 1, the pressing mechanism 22 has a contact member 221. In the left-right direction, the position of the end 2210 of the contact member 221 on the upper blade 21 side is the same as the position of the end of the lower blade 31 on the upper blade 21 side (i.e., the blade portion 310). As a result, when the moving upper blade 21 presses and bends the protruding portion R4, stress is less likely to concentrate on the portion CR4 near the end 2210 of the pressing mechanism 22 on the upper blade 21 side of the laminated electrode sheet 4. As a result, the press-splitting device 1 can separate the laminated electrode sheet 4 while further suppressing the occurrence of cracks.

[0084] As described with reference to FIGS. 1 to 7, the clearance angle of the press-breaking device 1 is 5° to 15°. As a result, the laminated electrode precursor 40 obtained by separating the broken material 41 is less likely to rub against the upper blade 21. As a result, the press-splitting device 1 can separate the laminated electrode sheet 4 while further suppressing the occurrence of interlayer short circuits.

[0085] As described with reference to FIGS. 1 to 7, in the press-breaking device 1, the length L3 of the clearance is 20 μm to 50 μm. This allows the press-cutting device 1 to prevent interlayer short circuits and cracks from occurring and separate the laminated electrode sheet 4 into pieces of desired dimensions. The length L4 of the laminated electrode sheet 4 in the up-down direction is, for example, 0.2 mm.

[0086] As described with reference to FIGS. 1 to 7, the press-breaking device 1 further includes a lower die holder 32 and an upper die holder 24. The upper blade 21 and the pressing mechanism 22 are attached to the upper die holder 24. The lower blade 31 is attached to the lower die holder 32. As a result, the press-breaking device 1 can efficiently separate the laminated electrode sheet 4 with a simple configuration.

[0087] As described with reference to FIGS. 1 to 7, the press-breaking device 1 includes an upper blade 21 and a lower blade 31. As shown in FIG. This allows the press-cutting device 1 to efficiently separate the laminated electrode sheet 4.

[0088] (2) Manufacturing method of laminated electrodes The method for manufacturing a stacked electrode according to this embodiment uses a press-splitting device 1 to manufacture a stacked battery. The method for manufacturing a stacked electrode according to this embodiment includes a preparation step, a placement step, a press-splitting step, and a stacking step. The preparation step, placement step, press-splitting step, and stacking step are performed in this order.

[0089] (2.1) Stacked battery The stacked battery is formed by stacking a negative electrode active material layer, a solid electrolyte layer, a positive electrode active material layer, and a positive electrode current collector in this order on both sides of a negative electrode current collector. In other words, the stacked battery includes a stacked electrode precursor 40 and two positive electrode current collectors stacked on the two positive electrode active material layers of the stacked electrode precursor 40. The first current collector sheet, the first active material sheet, the insulating sheet, and the second active material sheet included in the stacked electrode sheet are split to function as the first current collector, the first active material layer, the insulating layer, and the second active material layer. The negative electrode current collector sheet 42, the negative electrode active material sheet 43, the solid electrolyte sheet 44, and the positive electrode active material sheet 45 included in the stacked electrode sheet are split to become the negative electrode current collector, the negative electrode active material layer, the solid electrolyte layer, and the negative electrode active material layer included in the stacked electrode.

[0090] The positive electrode current collector may be made of, for example, stainless steel, aluminum, copper, nickel, iron, titanium, or carbon, and is preferably an aluminum alloy foil or aluminum foil. The aluminum alloy foil or aluminum foil may be manufactured using powder. The positive electrode current collector may be, for example, in the form of a foil or a mesh. The positive electrode current collector may have a positive electrode current collector tab. The positive electrode current collector tab is electrically connected to a positive electrode terminal of a laminated electrode described later. The positive electrode current collector tab may extend in one direction in the left-right direction from a portion of the positive electrode current collector corresponding to one of the left-right ends of the positive electrode active material layer. The positive electrode current collector may have a buffer layer, an elastic layer, or a PTC (Positive Temperature Coefficient) thermistor layer disposed on the surface thereof.

[0091] (2.2) Preparation process In the preparation step, a laminated electrode sheet 4 is prepared. The method for preparing the laminated electrode sheet 4 is not particularly limited, and any known method may be used.

[0092] (2.3) Placement process In the placing step, the laminated electrode sheet 4 is placed on the lower blade 31 so as to form the protruding portion R4 of the laminated electrode sheet 4. The method for placing the laminated electrode sheet 4 on the lower blade 31 is not particularly limited and may be any known method.

[0093] (2.4) Press-bending process In the press-bending step, the upper mold 2 including two upper blades 21 is moved downward to press-bend and break a portion of the protruding portion R4 of the laminate electrode sheet 4. In this embodiment, simply by moving the upper mold 2 downward, the protruding portion R4 is pressed-bended and broken. This results in a laminate electrode precursor 40 in which the broken material 41 has been separated from the laminate electrode sheet 4. The method for moving the upper mold 2 is not particularly limited and may be any known method. If the press-breaking device 1 is equipped with the above-mentioned driving means, the upper mold 2 may be moved by the driving means. If the press-breaking device 1 is not equipped with the above-mentioned driving means, the upper mold 2 may be moved manually. The moving speed of the upper mold 2 is not particularly limited and is, for example, 30 mm / sec.

[0094] (2.5) Lamination process In the lamination step, a positive electrode current collector is laminated on the positive electrode active material layer (i.e., the two positive electrode active material layers of the laminated electrode precursor 40) obtained from the positive electrode active material sheet 45 by carrying out the pressing and bending step. This results in a laminated battery. The method for laminating the positive electrode current collector on the positive electrode active material layer is not particularly limited, and any known method may be used.

[0095] (2.6) Action and Effect In the method for manufacturing a laminated electrode according to this embodiment, a laminated electrode is manufactured using a press-splitting device 1. The method for manufacturing a laminated electrode according to this embodiment includes a preparation step, a placement step, and a press-bending step. The electrode manufacturing method of the seventh aspect can manufacture a laminated electrode sheet having desired dimensions while suppressing the occurrence of interlayer short circuits and cracks.

[0096] In the method for manufacturing a laminated electrode according to this embodiment, the laminated electrode sheet 4 is formed by laminating a negative electrode active material sheet 43, a solid electrolyte sheet 44, and a positive electrode active material sheet 45 in this order along the first direction on both sides of a negative electrode current collector sheet 42. The method for manufacturing a laminated electrode according to this embodiment further includes a lamination step. This makes it possible to further suppress the occurrence of interlayer short circuits and cracks, and to manufacture a stacked electrode having desired dimensions.

[0097] (3) Manufacturing method of stacked battery The method for manufacturing a stacked battery according to this embodiment includes manufacturing a stacked electrode by the method for manufacturing a stacked battery according to this embodiment (hereinafter also referred to as an "electrode manufacturing step").

[0098] (3.1) Multilayer electrode The stacked electrode includes at least one stacked electrode, a positive electrode terminal, a negative electrode terminal, and an exterior body. The positive electrode terminal is electrically connected to a positive electrode current collector included in the stacked electrode. The negative electrode terminal is electrically connected to a negative electrode current collector included in the stacked electrode. The exterior body houses the at least one stacked electrode, the positive electrode terminal, and the negative electrode terminal so that the positive electrode terminal and the negative electrode terminal are electrically connected to the outside.

[0099] The number of stacked electrodes is appropriately selected depending on the application of the stacked electrodes, etc. When there are a plurality of stacked electrodes, the plurality of stacked electrodes may be stacked, for example, along the vertical direction.

[0100] The shape and size of the positive electrode terminal and the negative electrode terminal are appropriately selected depending on the application of the laminated electrode. Examples of the material for the positive electrode terminal and the negative electrode terminal include metal (e.g., stainless steel (SUS)).

[0101] The exterior body is not particularly limited, and examples thereof include a laminate exterior body, a metal can (for example, a rectangular or cylindrical shape), etc. The shape and size of the exterior body are appropriately selected depending on the application of the laminated electrode, etc.

[0102] (3.2) Electrode manufacturing process The method for manufacturing a stacked battery according to this embodiment includes an electrode manufacturing step.

[0103] In the electrode manufacturing step, a stacked electrode is manufactured by the manufacturing method of the stacked battery according to this embodiment.

[0104] (3.3) Other processes The manufacturing method of the stacked battery according to this embodiment may include other steps. These other steps include general steps for manufacturing a battery. Examples of the other steps include a step of stacking a plurality of stacked electrodes to produce an electrode stack, a step of housing the electrode stack in an exterior body (e.g., a laminate film, a can, etc.), a step of electrically connecting a plurality of negative electrode current collectors included in the electrode stack to at least one negative electrode terminal, and a step of electrically connecting a plurality of positive electrode current collectors included in the electrode stack to at least one positive electrode terminal.

[0105] (3.4) Action and Effect The method for manufacturing a stacked battery according to this embodiment includes an electrode manufacturing step. As a result, the method for manufacturing a stacked battery according to this embodiment can manufacture a stacked battery that is suppressed from causing interlayer short circuits and cracks and that includes stacked electrodes having desired dimensions.

[0106] (4) Variations In this embodiment, in the left-right direction, the position of the end 2210 of the contact member 221 on the upper blade 21 side is the same as the position of the end of the lower blade 31 on the upper blade 21 side (i.e., the blade portion 310), but it may be located closer to the upper blade 21 than the end of the lower blade 31 on the upper blade 21 side (i.e., the blade portion 310).

[0107] In this embodiment, the clearance angle θB is 5° to 15°, but may be outside the range of 5° to 15° as long as it is an acute angle.

[0108] In this embodiment, the clearance length L3 is 20 μm to 50 μm, but may be outside the range of 20 μm to 50 μm as long as it is 10% to 35% of the left-right length L4 of the laminated electrode sheet 4.

[0109] In this embodiment, the press-breaking device 1 includes the upper die holder 24 and the lower die holder 32, but at least one of the upper die holder 24 and the lower die holder 32 may not be included.

[0110] In this embodiment, the press-cutting device 1 includes a lower blade 31, but the lower blade 31 may not be included if a table on which the laminated electrode sheet 4 is placed is provided.

[0111] The method for manufacturing the stacked electrode of this embodiment includes a stacking step, but does not necessarily include the stacking step.

[0112] In this embodiment, the laminated electrode sheet 4 is formed by stacking a negative electrode active material sheet 43, a solid electrolyte sheet 44, and a positive electrode active material sheet 45 in this order on both sides of a negative electrode current collector sheet 42, but the present disclosure is not limited to this. The laminated electrode sheet may also be formed by stacking a positive electrode active material sheet 45, a solid electrolyte sheet 44, and a negative electrode active material sheet 43 in this order on both sides of a positive electrode current collector sheet. In the present disclosure, a separator for a lithium secondary battery using a non-aqueous electrolyte may be used instead of the solid electrolyte sheet 44.

[0113] In this embodiment, the laminated battery sheet is a battery sheet used in a lithium secondary battery using a solid electrolyte, but it may also be a battery sheet used in a secondary battery (such as a nickel-metal hydride battery).

[0114] In this embodiment, the angle θC formed between the end surface S310A and the contact surface S310B of the lower blade 31 is 90°, but may be less than 90°. [Explanation of symbols]

[0115] 1: Press-breaking device, 2: Upper die, 21: Upper blade, 210: Blade portion, 22: Pressing mechanism, 23: Guide pin, 24: Upper die holder, 3: Lower die, 31: Lower blade, 32: Lower die holder, 4: Laminated electrode sheet, 40: Laminated electrode precursor, 41: Scrap material, 42: Negative electrode current collector sheet, 43: Negative electrode active material sheet, 44: Solid electrolyte sheet, 45: Positive electrode active material sheet

Claims

1. a mounting table on which the laminated electrode sheet is placed; a pressing mechanism that presses the laminated electrode sheet placed on the mounting table; at least one cutting tool; Equipped with a press-breaking device that uses the at least one cutting blade tool that moves relative to the mounting table along a first direction to press and bend a part of a protruding portion of the laminated electrode sheet that protrudes from the mounting table and the pressing mechanism in the second direction perpendicular to the first direction, and breaks the part; The angle of the cutting edge of the cutting tool with respect to the second direction is 15° to 30°, an angle of the blade portion with respect to the first direction is an acute angle, A press-cutting device, wherein the length in the second direction of the clearance between the blade portion and the cutting edge tool side end of the mounting table is 10% to 35% of the length in the first direction of the laminated electrode sheet.

2. the pressing mechanism has a contact member that comes into contact with the laminated electrode sheet when pressing the laminated electrode sheet, 2. The pressing and splitting device according to claim 1, wherein, in the second direction, the position of the end of the contact member on the cutting edge tool side is the same as the position of the end of the table on the cutting edge tool side, or is closer to the cutting edge tool than the position of the end of the table on the cutting edge tool side.

3. The press-splitting device according to claim 1, wherein the angle of the blade portion with respect to the first direction is 5° to 15°.

4. The press-breaking device according to claim 1, wherein the length of the clearance in the second direction is 20 μm to 50 μm.

5. a lower mold holder; and an upper mold holder disposed opposite the lower mold holder and movable relative to the lower mold holder along the first direction, the first direction is parallel to the direction of gravity, the blade and the pressing mechanism are attached to the upper die holder, The press-breaking device according to claim 1 , wherein the mounting table is attached to the lower die holder.

6. The cutting edge tool is an upper cutting edge, The press-breaking device according to claim 5, wherein the mounting base is a lower blade.

7. A method for manufacturing a laminated electrode using the press-cutting device according to any one of claims 1 to 6, comprising: preparing the laminated electrode sheet; placing the laminated electrode sheet on the mounting table so that the protruding portion is formed; moving the at least one cutting edge tool in the first direction to bend and split the protruding portion of the laminated electrode sheet.

8. the laminated electrode sheet is formed by laminating a first active material sheet, a solid electrolyte sheet, and a second active material sheet in this order on both sides of a first current collector sheet along the first direction; The method for producing a stacked electrode according to claim 7 , further comprising stacking a second current collector on the second active material layer obtained from the second active material sheet by performing the pressing and splitting.

9. A method for producing a stacked battery, comprising producing a stacked electrode by the method for producing a stacked electrode according to claim 7.

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