Method for manufacturing battery and battery

Abstract

To suppress generation of breakage or deformation when an electrolyte is injected from a liquid injection port of a battery.SOLUTION: A battery has a plurality of electrodes stacked on one another, and includes: a liquid injection port 31 for injecting an electrolyte into an electrode; and a liquid injection frame formed to surround the liquid injection port 31. In at least a part of the edge surface of the liquid injection frame in the direction in which the electrodes are stacked, a rough surface part with a rougher surface than in the other sites of the liquid injection frame is formed.SELECTED DRAWING: Figure 6

Description

Technical Field

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

Background Art

[0002] Patent Document 1 discloses that an injection port is provided at an end of a bipolar battery by injection molding.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When injecting the electrolytic solution from the injection port, it is necessary to press a liquid injection frame formed so as to surround the injection port. However, if too much force is applied to the liquid injection frame, there is a risk of damage or deformation to the liquid injection frame.

[0005] Therefore, an object of the present disclosure is to provide a method for manufacturing a battery that can suppress deformation and breakage when injecting an electrolytic solution from an injection port of the battery. Also provided is a battery therefor.

Means for Solving the Problems

[0006] Although details will be described later, as a result of intensive studies, the inventor, in order to ensure the sealing property of the electrolytic solution during the injection of the electrolytic solution, presses the liquid injection frame from a direction intersecting the stacking direction of the battery during the injection, so there is concern about buckling and deformation. In contrast, by adding a restraining force to the liquid injection frame also in the stacking direction of the battery, the force due to the pressing is canceled. However, the inventor has obtained the knowledge that when the restraining force becomes large, damage or deformation occurs in the liquid injection frame. In contrast, the inventor has embodied a means capable of canceling the pressing force even when the restraining force is reduced.

[0007] The present application discloses a method for manufacturing a battery in which a plurality of electrodes are stacked, the method including a liquid injection step of supplying an electrolytic solution through a liquid injection frame formed so as to surround a liquid injection port for injecting the electrolytic solution into the electrodes. Among the liquid injection frames, end faces in the stacking direction of the plurality of electrodes are provided with a rough surface portion having a larger surface roughness than other portions of the liquid injection frame. In the liquid injection step, a first jig is disposed by pressing so as to cover the opening of the liquid injection frame, and a second jig is disposed so as to press the rough surface portion, and the electrolytic solution is supplied to the liquid injection port.

[0008] It may be configured such that the coefficient of static friction between the second jig and the rough surface portion is 0.5 or more.

[0009] The present application discloses a battery in which a plurality of electrodes are stacked, the battery including a liquid injection port for injecting an electrolytic solution into the electrodes and a liquid injection frame formed so as to surround the liquid injection port. Among the liquid injection frames, at least a part of end faces in the stacking direction of the plurality of electrodes is provided with a rough surface portion having a larger surface roughness than other portions of the liquid injection frame.

Advantages of the Invention

[0010] According to the present disclosure, since the friction between the member (second jig) that applies the restraining force and the liquid injection frame is increased, even if the restraining force in the stacking direction of the battery is reduced, the pressing force for obtaining the sealing property can be canceled, and the occurrence of deformation and breakage of the liquid injection frame can be suppressed.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0012] 1. Structure of the battery First, the structure of the secondary battery 10 according to one example of the present disclosure will be described with reference to the drawings. The drawings also show the directions of the three-dimensional orthogonal coordinate system. Here, the xy plane is the horizontal plane, the z-axis direction is the vertical direction, and the larger z value is the upper side.

[0013] FIG. 1 is a schematic external perspective view for explaining the structure of the secondary battery 10. In this embodiment, the secondary battery 10 is a bipolar lithium-ion secondary battery. As such, the secondary battery 10 has a plurality of metal conductive plates 11 and power storage modules 12, respectively, and these are alternately stacked and electrically connected to form a series connection. The secondary battery 10 is typically used for batteries such as hybrid vehicles and electric vehicles. Also, both ends in the stacking direction (the z-axis direction in FIG. 1) of the stacking are conductive plates 11. A positive electrode terminal (not shown) is connected to the conductive plate 11 at one end in the stacking direction, and a negative electrode terminal (not shown) is connected to the conductive plate 11 at the other end in the stacking direction.

[0014] The power storage module 12 is a flat single battery as a whole, having front and back surfaces and side surfaces 12a forming a thickness.

[0015] 1.1. Internal structure of the power storage module FIG. 2 shows a cross-sectional view schematically showing the internal structure of one power storage module 12 with attention focused thereon. In this embodiment, the power storage module 12 includes an electrode laminate L formed by stacking a plurality of bipolar electrodes 13, a plurality of sealing bodies 20 provided on each bipolar electrode 13, and a liquid injection portion 30 (see FIG. 1) which is a portion for injecting an electrolytic solution. The plurality of bipolar electrodes 13 are stacked along the thickness direction (the z-axis direction, the thickness direction in the flat plate shape), and the sealing bodies 20 are arranged on each bipolar electrode 13.

[0016] 1.1.1. Electrode laminate [Bipolar electrode] In the following description of each component, the terms "upper surface" and "lower surface" may be used. However, in FIG. 2, the "upper surface" means the larger side in the z-axis direction, and the "lower surface" means the smaller side in the z-axis direction. This is for convenience of description, but the "upper surface" can be rephrased as the "first surface" and the "lower surface" as the "second surface". The bipolar electrode 13 includes a current collector foil 14, a positive electrode active material layer 15 (first active material layer) provided on the lower surface of the current collector foil 14, and a negative electrode active material layer 16 (second active material layer) provided on the upper surface of the current collector foil 14.

[0017] The current collector foil 14 is a foil-shaped conductive member, and for example, a metal foil is used. It does not have to be a single-layer metal foil, and a clad foil or a laminated foil in which different metal foils are laminated may be used. The type of metal is not particularly limited. For example, a foil in which an aluminum foil and a copper foil are laminated so that the upper surface is an aluminum layer and the lower surface is a copper layer can be mentioned. Other metals include titanium, nickel, stainless steel (such as SUS304, SUS316, SUS301 defined in JIS G 4305:2015), steel (such as cold-rolled steel sheet (SPCC, etc.) defined in JIS G 3141:2005), etc.

[0018] The positive electrode active material layer 15 constitutes the positive electrode of the bipolar electrode 13 and is disposed on the lower surface of the current collector foil 14 via an adhesive layer such as acetylene black in this embodiment. The positive electrode active material layer 15 can contain a positive electrode active material, a conductive assistant, and a binder. Examples of the positive electrode active material include composite oxides, metal lithium, and sulfur. The composition of the composite oxide includes, for example, at least one of iron, manganese, titanium, nickel, cobalt, and aluminum, and lithium. Examples of the composite oxide include olivine-type lithium iron phosphate (LiFePO 4 ), LiCoO 2 , LiNiMnCoO 2 , etc. The binder serves to fasten the active material or the conductive additive to the surface of the current collector foil 14 and maintain the conductive network in the electrode. Examples of the binder include fluorine-containing resins such as polyvinylidene fluoride, polytetrafluoroethylene, and fluororubber; thermoplastic resins such as polypropylene and polyethylene; imide resins such as polyimide and polyamideimide; alkoxysilyl group-containing resins; acrylic resins containing monomer units such as acrylic acid and methacrylic acid; styrene-butadiene rubber (SBR); carboxymethyl cellulose; alginates such as sodium alginate and ammonium alginate; water-soluble cellulose ester crosslinked products; starch-acrylic acid graft polymers; and the like. These binders can be used alone or in combination. Examples of the conductive additive include acetylene black, carbon black, graphite, and the like.

[0019] The negative electrode active material layer 16 constitutes the negative electrode of the bipolar electrode 13 and is disposed on the upper surface of the current collector foil 14 in this embodiment. The negative electrode active material layer 16 can include a negative electrode active material, a conductive additive, and a binder. The conductive additive and the binder can be considered in the same manner as the positive electrode active material layer 15. Examples of the negative electrode active material include carbon such as graphite, artificial graphite, highly oriented graphite, mesocarbon microbeads, hard carbon, and soft carbon; metal compounds; elements that can be alloyed with lithium or compounds of such elements; boron-added carbon; and the like. Examples of the elements that can be alloyed with lithium include silicon and tin.

[0020] [Separator] A separator 17 is disposed between adjacent bipolar electrodes 13. The separator 17 is, for example, a porous sheet or nonwoven fabric containing a polymer that absorbs and holds a liquid electrolyte, and in this embodiment, is disposed between the positive electrode active material layer 15 and the negative electrode active material layer 16 of the electrodes adjacent in the z-axis direction. Examples of the material constituting the separator 17 include polypropylene, polyethylene, polyolefin, polyester, and the like. The separator 17 may have a single-layer structure or a multilayer structure. Examples of the electrolyte absorbed and held by the separator 17 include a liquid electrolyte (electrolyte solution) containing a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent. When the separator 17 is impregnated with the electrolyte, as the electrolyte salt, LiClO 4 , LiAsF 6 , LiPF 6 , LiBF 4 , LiCF3SO 3 , LiN(FSO 2 ) 2 , LiN(CF 3 SO 2 ) 2 and other known lithium salts can be used. Also, as the non-aqueous solvent, known solvents such as cyclic carbonates, cyclic esters, chain carbonates, chain esters, and ethers can be used.

[0021] [Sizes of each layer, etc.] The current collector foil 14, the positive electrode active material layer 15, the negative electrode active material layer 16, and the separator 17 are configured to have different sizes in plan view. More specifically, the current collector foil 14 is the largest, followed by the separator 17, then the negative electrode active material layer 16, and the positive electrode active material layer 17 is the smallest. As can be seen from FIG. 2, the current collector foil 14, the positive electrode active material layer 15, the negative electrode active material layer 16, and the separator 17 are arranged with their centers aligned in plan view, and the difference in size is represented by the degree of edge protrusion (overhang). Therefore, the edge of the current collector foil 14 protrudes the most, and the edges of the separator 14, the negative electrode active material layer 16, and the positive electrode active material layer 15 protrude in this order from the inside.

[0022] To form the positive electrode active material layer 15 and the negative electrode active material layer 16 on the current collector foil 14, conventionally known methods such as a roll coating method, a die coating method, a dip coating method, a doctor blade method, a spray coating method, a curtain coating method, etc. are used. Specifically, an active material, a solvent, and, if necessary, a binder and a conductive aid are mixed to produce a slurry-like composition for forming an active material layer, and the composition for forming the active material layer is applied to the upper and lower surfaces of the current collector foil 14 and then dried. The solvent is, for example, N-methyl-2-pyrrolidone, methanol, methyl isobutyl ketone, or water.

[0023] [Laminated Structure of Electrode Stack] In the electrode stack L, the bipolar electrodes 13 adjacent to each other in the stacking direction (z-axis direction) of the electrodes are stacked so as to overlap with a separator 17 interposed between the positive electrode active material layer 15 of one bipolar electrode 13 and the negative electrode active material layer 16 of the other bipolar electrode 13. Here, the size of the electrode stack L in plan view (size in the xy plane direction) is not particularly limited, but it may be a large electrode stack L such as 1 m × 1 m.

[0024] In addition, the electrode stack L has a positive terminal electrode 18 at its upper end and a negative terminal electrode 19 at its lower end at the end of the stack in the stacking direction of the stack formed by the bipolar electrodes 13. The positive terminal electrode 18 has the current collector foil 14 and the positive electrode active material layer 15 provided on the lower surface of the current collector foil 14. A separator 17 is interposed between the positive electrode active material layer 15 of the positive terminal electrode 18 and the negative electrode active material 16 of the adjacent bipolar electrode 13. The negative terminal electrode 19 has the current collector foil 14 and the negative electrode active material layer 16 provided on the upper surface of the current collector foil 14. A separator 17 is interposed between the negative electrode active material layer 16 of the negative terminal electrode 19 and the positive electrode active material layer 15 of the adjacent bipolar electrode 13. A conductive plate 11 is laminated on the current collector foil 14 of the positive terminal electrode 18 and the negative terminal electrode 19.

[0025] 1.1.2. Sealing Body The sealing body 20 is a member that seals the bipolar electrode 13 by being disposed at the outer peripheral end of the bipolar electrode 13. Accordingly, the space between the bipolar electrodes 13 adjacent to each other in the stacking direction is also sealed. In this embodiment, the sealing body 20 includes a first seal member 21, a second seal member 22, and a spacer 23.

[0026] [First seal member] The first seal member 21 is a frame-shaped member, which is disposed along the outer peripheral end (outer edge) of the bipolar electrode 13. Specifically, as can be seen from FIG. 2, the first seal member 21 is disposed and joined between the upper surface of the current collector foil 14 and the lower surface of the spacer 23 at the outer peripheral end of the bipolar electrode 13, so that the negative electrode active material layer 16 is disposed within its frame. In this embodiment, a predetermined interval is provided between the inner edge of the first seal member 21 and the negative electrode active material layer 16 to form a space S. On the other hand, the outer edge of the first seal member 21 is configured such that the first seal member 21 protrudes outside the current collector foil 14. In addition, in this embodiment, the peripheral edge of the separator 17 is welded and fixed to the first seal member 21.

[0027] The first seal member 21 has electrical insulation properties and can be made of a resin material having electrolyte resistance, such as acid-modified polyethylene (acid-modified PE), acid-modified polypropylene (acid-modified PP), polyethylene, or polypropylene, which are known materials.

[0028] [Second seal member] The second seal member 22 is a frame-shaped member, which is disposed along the outer peripheral end (outer edge) of the bipolar electrode 13. Specifically, as can be seen from FIG. 2, the second seal member 22 is disposed and joined between the lower surface of the current collector foil 14 and the upper surface of the spacer 23 at the outer peripheral end of the bipolar electrode 13, so that the positive electrode active material layer 15 is disposed within its frame. In this embodiment, a predetermined gap is provided between the inner edge of the second sealing member 22 and the positive electrode active material layer 15, forming a space S. On the other hand, the outer edge of the second sealing member 22 is configured such that the second sealing member 22 protrudes outward from the current collector foil 14, and the upper surface of the second sealing member 22 is joined to the lower surface of the first sealing member 21. The material of the second sealing member 22 can be considered in the same way as that of the first sealing member 21.

[0029] [Spacer] The spacer 23 is a frame-shaped member, which is arranged along the outer peripheral end of the bipolar electrode 13. Specifically, as can be seen from FIG. 2, the spacer 23 is arranged between the first sealing member 21 and the second sealing member 22. By joining the mutually adjacent first sealing member 21, spacer 23, and second sealing member, the space S of each cell is sealed. By being combined, at the outer peripheral end of the bipolar electrode 13, it is arranged and joined between the lower surface of the second sealing member 22 and the upper surface of the separator 17 of the adjacent bipolar electrode 13, and the positive electrode active material layer 15 is arranged within its frame. In this embodiment, the inner edge of the spacer member 23 is arranged at a distance from the positive electrode active material layer 15 and the negative electrode active material layer 16. On the other hand, the outer edge of the spacer 23 protrudes outside the edge of the current collector foil 14, and its lower surface is joined to the upper surfaces of the first sealing member 21 and the second sealing member 22 of the sealing body 20 adjacent to its outer edge. The material of the spacer 23 can be considered in the same way as that of the first sealing member 21.

[0030] 1.1.3. Liquid injection part The liquid injection part 30 is formed in a part of the side surface 12a of the power storage module 12, and is a part for injecting (injecting liquid) the electrolytic solution into the power storage module 12. FIG. 3 shows a perspective view (the sealing material 33 is omitted for clarity) of a part of the part of the side surface 12a of one power storage module 12 in FIG. 1 where the liquid injection part 30 is arranged, enlarged. FIG. 4 shows a cross-sectional view along the line A-A parallel to the z-axis in FIG. 3 (the sealing material 33 is not separated).

[0031] In this embodiment, the liquid injection part 30 has a liquid injection port 31, a liquid injection frame 32, and a sealing material 33.

[0032] [Liquid injection port] The liquid injection port 31 is formed on the side surface 12a of the power storage module 12, and is an opening formed on the side surface 12a side among the holes (not shown) that penetrate the sealing body 20 and communicate the space S with the outside. The liquid injection port 31 (through hole) can be provided one for each bipolar electrode 13, for example. In that case, the number of liquid injection ports 31 corresponding to the number of bipolar electrodes 13 provided is formed. As described above, since the plurality of bipolar electrodes 13 are laminated and the positions in the z-axis direction in FIG. 3 are different, the position of the liquid injection port 31 in the z-axis direction is also changed according to the position of the bipolar electrode 13.

[0033] In this embodiment, each liquid injection port 31 (through hole) is a horizontally long slit with a long side extending in the direction of going around the side surface 12a. This shape is not particularly limited, but since the shape of the space S communicated with the through hole 31 is small in the lamination direction of the bipolar electrodes 13 (z-axis direction in FIG. 3) and large in the planar direction (xy plane direction in FIG. 3) due to its nature, the injection of the electrolytic solution can be efficiently performed by making the liquid injection port 31 (through hole) into a slit.

[0034] [Liquid injection frame] The liquid injection frame 32 is a frame-shaped member and is disposed on the side surface 12a. The liquid injection frame 32 is disposed so as to surround each liquid injection port 31. As a result, a recess 32a having an opening surrounded by the liquid injection frame 32 with the side surface 12a having the liquid injection port 31 as the bottom is formed by the thickness of the liquid injection frame 32 (the size in the y-axis direction in FIG. 3). Further, the surface 32b of the liquid injection frame 32 on the side opposite to the side in contact with the side surface 12a becomes a welding surface with the sealing body 33 and a contact surface with a first jig 40 described later.

[0035] In this embodiment, the liquid injection frame 32 has a rectangular outer frame 32c forming its outer shape, and the inside of the outer frame 32c is partitioned by partition walls 32d to form each recess 32a. The outer frame 32c is a rectangular frame along the x-z plane and has a shape that extends long in the x-axis direction with respect to the z-axis direction. Each recess 32a partitioned by the partition wall 32d also has a shape that is long in the x-axis direction with respect to the z-axis direction.

[0036] The material constituting the liquid injection frame 32 is not particularly limited, but it is preferably made of resin, typically polyethylene. And such a liquid injection frame can be manufactured by injection molding.

[0037] In this embodiment, at least a part (the part where the second jig 41 described later contacts) of the end face in the stacking direction (z-axis direction) of the electrode laminate L of the liquid injection frame 32 is a rough surface portion T. The degree of the rough surface portion T is not particularly limited, but it is formed so that the surface roughness is larger than the smoothest surface among the surfaces other than the rough surface portion T on the surface of the liquid injection frame 32. In relation to the second jig 41 described later, it is preferable that the surface is roughened so that the static friction coefficient is 0.5 or more. Thereby, it is possible to suppress the occurrence of deformation or breakage of the liquid injection frame 32 in the liquid injection step S11 described later. The specific aspect of the rough surface portion T is not particularly limited, and examples include a rough surface having a geometric shape such as a mesh shape or a lined shape, and a rough surface with an irregular shape by sanding or chemical treatment.

[0038] In this embodiment, as a preferred form, the rough surface portions T are provided on both end faces in the z-axis direction, but the rough surface portion T may be provided on only one of the end faces.

[0039] [Sealing material] The sealing material 33 is a sheet-like sealing material, which is covered on the liquid injection frame 32 so as to cover the recess 32a formed by the liquid injection frame 32 and is welded to the surface 32b. Thereby, it is possible to prevent the injected electrolytic solution from leaking from the secondary battery 10. The sealing material 33 may be formed of a known sheet. For example, an aluminum laminate sheet having a layer structure in which aluminum foil is covered with resin is typical.

[0040] 2. Manufacturing Method of Secondary Battery The secondary battery 10 can be manufactured, for example, by the manufacturing method S10 as shown in the flow in FIG. 5. As can be seen from FIG. 5, the manufacturing method S10 of the secondary battery includes a liquid injection step S11, a first charging step S12, a high-temperature aging step S13, and a sealing step S14. Details will be described below.

[0041] 2.1. Liquid Injection Step In the liquid injection step S11, an electrolyte is injected into the bipolar electrode 13. FIG. 6 shows a diagram for explanation. FIG. 6 is a view from the same perspective as FIG. 4, and for ease of viewing, the reference numerals omitted can be referred to FIG. 4.

[0042] In the liquid injection step S11, with respect to the secondary battery 10 before injecting the electrolyte (the sealing material 33 is not welded), the first jig 40 is arranged so as to press the closing surface 32b against the opening of the concave portion 32a (arrow F1 in FIG. 6). Thereby, the sealing property when the electrolyte is supplied from the liquid supply device is ensured thereafter. Therefore, the first jig 40 is preferably made of a material with a low elastic modulus, and more preferably a viscoelastic material such as rubber. Note that the first jig 40 is provided with a flow path 40a through which air during evacuation and the electrolyte from the supply device pass.

[0043] In accordance with this, the second jig 41 is arranged so as to generate a restraining force (F2) across the liquid injection frame 32 along the stacking direction (z-axis direction) of the electrode laminate L, including the rough surface portion T of the liquid injection frame 32. Thereby, the influence of the pressing force F1 by the first jig 40 on the electrode laminate L can be greatly reduced. The second jig 41 is preferably made of a material with a high elastic modulus (high rigidity) so that deformation hardly occurs due to shear force, and examples thereof include metals such as stainless steel.

[0044] As described above, the sealing property during the injection of the electrolyte can be ensured by the first jig 40. On the other hand, the pressing force F1 by the first jig 40 can also exert a pressing force on the electrode laminate L as can be seen from its direction, and there is concern about the influence (such as deformation) on the electrode laminate L. On the other hand, by pressing (F2) the liquid injection frame 32 with the second jig 41 so as to be restrained from the z-axis direction, the frictional force (μ·F2, where μ is the coefficient of static friction) generated on the contact surface between the second jig 41 and the liquid injection frame 32 acts in a direction opposing the pressing force F1 by the first jig 40. Thereby, the pressing force F1 is canceled, and the influence on the electrode laminate L can be reduced. Here, in order for the frictional force by the second jig 41 to oppose the pressing force F1 by the first jig 40, it is necessary to increase the restraining force F2. However, if the restraining force F2 is increased too much, the force for sandwiching the liquid injection frame 32 becomes too large, and there is a concern about deformation or breakage of the liquid injection frame. On the other hand, in the present disclosure, since the surface of the liquid injection frame 32 in contact with the second jig 41 is a rough surface portion T, the coefficient of static friction is increased, so that a frictional force can be obtained without significantly increasing the restraining force F2. Therefore, it is possible to suppress the occurrence of deformation or breakage of the liquid injection frame 32.

[0045] In the state where the first jig 40 and the second jig 41 are arranged as described above, a liquid supply device is connected to the side of the first jig 40 opposite to the liquid injection frame 32. Vacuum pumping is performed through the flow path 40a by a vacuum pump via a vacuum suction tube with the valve arranged in the liquid supply device opened, and the valve is closed to maintain a reduced pressure state. In that state, the valve of the liquid supply pipe is opened, and the electrolytic solution is sent from the recess 32a and the liquid injection port 31 through the through hole via the flow path 40a to the bipolar electrode 13, and the electrolytic solution is injected into the bipolar electrode 13.

[0046] 2.2. Initial charging process In the initial charging process S12, the first charging is performed. The conditions of the initial charging process are not particularly limited and are as known.

[0047] 2.3. High-temperature aging process Next, the high-temperature aging process S13 is performed. The process of high-temperature aging is as known. For example, the secondary battery 10 is conditioned by a procedure such as leaving it standing at 65°C for 15 hours.

[0048] 2.4. Sealing process In the sealing step S14, the sealing material 33 is placed on the liquid injection frame 32 so as to cover the recess 32a formed by the liquid injection frame 32, and the sealing material 33 is welded to the surface 32b of the liquid injection frame 32. The welding method is not particularly limited, and examples thereof include a method of pressing a heating body and irradiation with a laser.

Explanation of reference numerals

[0049] 10... secondary battery, 11... conductive plate, 12... power storage module, 13... bipolar electrode, 20... sealing portion, 30... liquid injection portion, 31... liquid injection port, 32... liquid injection frame, 33... sealing material, 40... first jig, 41... second jig

Claims

1. A method for manufacturing a battery in which a plurality of electrodes are stacked, comprising: a liquid injection step of supplying an electrolytic solution through a liquid injection frame formed so as to surround a liquid injection port for injecting the electrolytic solution into the electrode; among the liquid injection frames, end faces in the stacking direction of the plurality of electrodes are provided with a rough surface portion having a larger surface roughness than other portions of the liquid injection frame; in the liquid injection step, a first jig is arranged by pressing so as to cover an opening of the liquid injection frame, and a second jig is arranged so as to press the rough surface portion, and the electrolytic solution is supplied to the liquid injection port; A method for manufacturing a battery.

2. The method for manufacturing a battery according to claim 1, wherein a static friction coefficient between the second jig and the rough surface portion is 0.5 or more.

3. A battery in which a plurality of electrodes are stacked, comprising: a liquid injection port for injecting an electrolytic solution into the electrode; a liquid injection frame formed so as to surround the liquid injection port; among the liquid injection frames, at least a part of end faces in the stacking direction of the plurality of electrodes is provided with a rough surface portion having a larger surface roughness than other portions of the liquid injection frame; A battery.

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