Manufacturing method of battery

Abstract

To provide a manufacturing method of a battery, capable of obtaining the battery with a good volumetric efficiency.SOLUTION: The present disclosure provides a manufacturing method of a battery, having: an electrode body; an outer casing; and a lid. The manufacturing method of a battery, includes: a preparation step of preparing a predetermined outer casing; an insertion step of inserting the electrode body into the outer casing; a press step of pressing the outer casing under a predetermined condition after the insertion step; and a lid body arrangement step of arranging the lid to an open part before / after the press step, and the problem is solved by providing the manufacturing method of the battery.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] In a battery such as a secondary battery, usually, an electrode body is accommodated in an internal space of an exterior body. For example, Patent Document 1 discloses a rectangular secondary battery having a flat wound electrode body obtained by winding a positive electrode plate and a negative electrode plate with a separator interposed therebetween, a rectangular exterior body having an opening and accommodating the wound electrode body, and a sealing plate for sealing the opening. Further, Patent Document 1 discloses that the rectangular exterior body has a bottom wall, a pair of first side walls extending from the bottom wall and facing each other, a pair of second side walls extending from the bottom wall and facing each other, and an opening facing the bottom wall.

[0003] Patent Document 2 discloses a method for manufacturing a battery having a fitting step and a joining step, and in the joining step, the exterior body and the sealing plate are joined while pressing a pair of first side walls toward the inside of the exterior body. Further, Patent Document 3 discloses a method for manufacturing a lithium ion secondary battery having a predoping step of performing lithium predoping and a charging step of performing first charging while pressurizing the cell.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] The rectangular exterior body in Patent Document 1 has a bottom wall, a pair of first side walls, a pair of second side walls, and an opening. When inserting an electrode body into the internal space of such an exterior body through the opening, it is necessary to make the dimensions of the opening larger than those of the electrode body. Accordingly, the volume of the internal space of the exterior body also usually becomes larger than the volume of the electrode body. As a result, an excess gap is generated in the internal space of the exterior body, and thus the volume efficiency of the battery decreases.

[0006] The present disclosure has been made in view of the above circumstances, and a main object thereof is to provide a method for manufacturing a battery capable of obtaining a battery with good volume efficiency.

Means for Solving the Problems

[0007] [1] A method for manufacturing a battery including an electrode body, an exterior body, and a lid body, the method for manufacturing the battery includes: a preparation step of preparing the exterior body satisfying the following (i) to (iii); (i) The exterior body has a first surface, a second surface facing the first surface, a third surface connecting the first surface and the second surface, and a fourth surface connecting the first surface and the second surface and facing the third surface; (ii) The exterior body has an internal space formed by the first surface, the second surface, the third surface, and the fourth surface, and an opening located at an end of the internal space; (iii) The exterior body has a corner portion with a curved shape at at least one of both ends of a side formed by the third surface in a cross section perpendicular to the first surface and the third surface at an end of the exterior body, and has a corner portion with a curved shape at at least one of both ends of a side formed by the fourth surface; an insertion step of inserting the electrode body into the internal space through the opening; After the above insertion step, in a state where the relative positions of the third surface and the fourth surface are fixed, or in a state where at least one of the third surface and the fourth surface is pressed toward the electrode body, a pressing step of pressing at least one of the first surface and the second surface toward the electrode body; A lid body arranging step of arranging the lid body in the opening before or after the pressing step; A method for manufacturing a battery, comprising:

[0008] [2] In the battery manufacturing method according to [1], the outer package has, at both ends of the side formed by the third surface, corner portions having the curved shape in a cross section perpendicular to the first surface and the third surface at an end portion of the outer package, and has, at both ends of the side formed by the fourth surface, corner portions having the curved shape, respectively.

[0009] [3] Before the pressing step, the bending radius of each of the four corner portions is 0.5 mm or more and 1.5 mm or less; In the battery manufacturing method according to [2], after the pressing step, the bending radius of each of the four corner portions is 0.1 mm or more and 0.5 mm or less.

[0010] [4] In the battery manufacturing method according to any one of [1] to [3], the electrode body contains a solid electrolyte.

[0011] [5] In the battery manufacturing method according to any one of [1] to [4], the lid body arranging step is performed after the pressing step. [Effect of the Invention]

[0012] In the present disclosure, there is an effect that a battery with good volume efficiency can be obtained. [Brief Description of the Drawings]

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

[0014] Hereinafter, a method for manufacturing a battery according to the present disclosure will be described in detail with reference to the drawings. Each of the drawings shown below is schematically illustrated, and the size and shape of each part are appropriately exaggerated for easy understanding. Further, in this specification, when expressing the manner of arranging one member with respect to another member, if it is simply described as "above" or "below" without particular notice, it includes both the case where another member is arranged directly above or directly below so as to be in contact with a certain member, and the case where another member is arranged above or below a certain member via another member.

[0015] FIG. 1 is a schematic perspective view and a schematic cross-sectional view illustrating a method for manufacturing a battery according to the present disclosure. Specifically, FIG. 1(a) is a schematic perspective view illustrating each member constituting the battery, FIG. 1(b) is a schematic perspective view illustrating the battery according to the present disclosure, FIG. 1(c) is a schematic cross-sectional view of the battery shown in FIG. 1(b) cut along the y-z plane, and FIG. 1(d) is a cross-sectional view taken along line A-A of FIG. 1(c). In FIG. 1(a), for convenience, the description of the positive electrode tab (for example, the positive electrode tab 5t in FIG. 1(c)) and the negative electrode tab (for example, the negative electrode tab 1t in FIG. 1(c)) is omitted.

[0016] In the method for manufacturing a battery according to the present disclosure, first, as shown in FIG. 1(a), an exterior body 20 is prepared (preparation step). The exterior body 20 satisfies the following (i) to (iii). Specifically, (i) the exterior body 20 has a first surface S1, a second surface S2 facing the first surface S1, a third surface S3 connecting the first surface S1 and the second surface S2, and a fourth surface S4 connecting the first surface S1 and the second surface S2 and facing the third surface S3. Also, (ii) the exterior body 20 has an internal space IS formed by the first surface S1, the second surface S2, the third surface S3, and the fourth surface S4, and openings O (O1, O2) located at the ends of the internal space IS. Further, (iii) as shown in FIG. 3(a) described later, in a cross-section perpendicular to the first surface S1 and the third surface S3 at the end of the exterior body 20, the exterior body 20 has a corner α with a curved shape at at least one of both ends of the side formed by the third surface S3. Although not particularly shown, the exterior body also has a corner with a curved shape at at least one of both ends of the side formed by the fourth surface.

[0017] Next, as shown in FIG. 1(a), the electrode body 10 is inserted into the internal space IS of the exterior body 20 through the opening O of the exterior body 20 (insertion step). The electrode body 10 shown in FIG. 1(a) has a rectangular shape. Also, as shown in FIG. 2(a), when the electrode body 10 is inserted into the exterior body 20, a gap G2 is formed between the electrode body 10 and the second surface S2 of the exterior body 20. The gap G2 is a gap caused by the surface state (e.g., bending, undulation, unevenness) of the electrode body 10. Although not particularly shown, due to the weight of the electrode body, a part of the electrode body is in contact with the second surface of the exterior body. Also, as shown in FIG. 2(a), a gap G1 is formed between the electrode body 10 and the first surface S1 of the exterior body 20. The gap G1 is the sum of the gap caused by the surface state of the electrode body 10 and the gap required for inserting the electrode body 10 into the exterior body 20. Also, in order to insert the electrode body 10 into the exterior body 20, a gap G3 is formed between the electrode body 10 and the third surface S3 of the exterior body 20, and a gap G4 is formed between the electrode body 10 and the fourth surface S4 of the exterior body 20.

[0018] Next, as shown in FIG. 2(b), the electrode body 10 and the exterior body 20 are placed on the holding member 40b, and with the relative positions of the third surface S3 and the fourth surface S4 fixed by the holding members 40c and 40d, the first surface S1 is pressed toward the electrode body 10 by the pressing member 50 (pressing step). As a result, as shown in FIGS. 2(c) and 2(d), the gaps G1 and G2 disappear. Thus, the gaps G1 and G2 can be reduced by the pressing step. Further, FIG. 3(a) is an enlarged view of the corner α shown in FIG. 2(a), and FIG. 3(b) is an enlarged view of the corner α shown in FIG. 2(d). As shown in FIGS. 3(a) and 3(b), by reducing the bending radius of the corner α in the pressing step, the excess of the exterior body 20 is absorbed. Next, as shown in FIG. 1(b), the lid bodies 30 (30A, 30B) are arranged in the openings O (O1, O2) (lid body arrangement step). Thereby, the battery 100 is obtained.

[0019] According to the present disclosure, by performing a predetermined pressing step, the gaps G1 and G2 can be reduced, and a battery with good volume efficiency can be obtained. As described above, when the electrode body is inserted into the internal space of the exterior body through the opening, it is necessary to make the dimension of the opening larger than the dimension of the electrode body. Along with this, the volume of the internal space of the exterior body also usually becomes larger than the volume of the electrode body. As a result, an excess gap is generated in the internal space of the exterior body. For example, as shown in FIG. 4(a), the volume efficiency of the battery 100 decreases. In contrast, according to the present disclosure, by performing a predetermined pressing step, the gaps G1 and G2 can be reduced. Therefore, for example, as shown in FIG. 4(b), a battery 100 with good volume efficiency can be obtained. Further, since the gaps G1 and G2 have heat insulation properties, if the gaps G1 and G2 exist, the heat dissipation of the battery becomes low. In contrast, in the present disclosure, by reducing the gaps G1 and G2, the heat dissipation of the battery can be improved. Also, as shown in FIGS. 3(b) and 3(c), when the first surface S1 is pressed by the pressing member 50 having a flat surface, the surface state (for example, bending, undulation, unevenness) of the electrode body 10 can be made flat, and the volume efficiency of the battery can be further improved.

[0020] 1. Preparation step The preparation step in the present disclosure is a step of preparing the above-described exterior body that satisfies the following (i) to (iii).

[0021] As shown in FIG. 1(a), (i) the exterior body 20 has a first surface S1, a second surface S2 facing the first surface S1, a third surface S3 connecting the first surface S1 and the second surface S2, and a fourth surface S4 connecting the first surface S1 and the second surface S2 and facing the third surface S3. The first surface S1 and the second surface S2 generally correspond to the main surfaces, and the third surface S3 and the fourth surface S4 generally correspond to the side surfaces.

[0022] Also, as shown in FIG. 1(a), (ii) the exterior body 20 has an internal space IS formed by the first surface S1, the second surface S2, the third surface S3, and the fourth surface S4, and openings O (O1, O2) located at the ends of the internal space IS. The exterior body 20 shown in FIG. 1(a) has two openings O1 and O2 facing each other. On the other hand, although not particularly shown, the exterior body may have only one opening. In that case, the exterior body may have a fifth surface instead of the opening O2 shown in FIG. 1(a).

[0023] Also, as shown in FIGS. 1(a) and 3(a), (iii) the exterior body 20 has a corner α with a curved shape at at least one of both ends of the side formed by the third surface S3 in a cross section perpendicular to the first surface S1 and the third surface S3 at the end of the exterior body 20, and has a corner α with a curved shape at at least one of both ends of the side formed by the fourth surface S4. The exterior body in the present disclosure has a corner with a curved shape at at least one of both ends of the side formed by the third surface, and may have corners at both ends of the side formed by the third surface, respectively. Similarly, the exterior body in the present disclosure has a corner with a curved shape at at least one of both ends of the side formed by the fourth surface, and may have corners at both ends of the side formed by the fourth surface, respectively.

[0024] The exterior body in the present disclosure may be a case-type exterior body or a laminate-type exterior body. The case-type exterior body is, for example, a metal exterior body. Examples of the material constituting the case-type exterior body include aluminum and aluminum alloys (e.g., A1050-H18, A3003-H18). Also, a material obtained by performing plastic working on aluminum or an aluminum alloy (e.g., A1050-O, A3003-O) and work-hardening may be used. Further, the thickness of the case-type exterior body is not particularly limited and is selected to obtain a desired rigidity. Also, the case-type exterior body may be subjected to an insulation treatment (e.g., insulation resin coating, insulation film attachment, anodizing) on the surface facing the electrode body or the lid body.

[0025] The laminate-type exterior body is also referred to as a pouch-type exterior body and is an exterior body using a laminate film. The laminate-type exterior body has at least an inner resin layer and a metal layer. The inner resin layer functions as a sealant layer. The inner resin layer preferably contains a thermoplastic resin. Examples of the thermoplastic resin include polyolefins such as polyethylene and polypropylene, polystyrene, and polyvinyl chloride. The thickness of the inner resin layer is not particularly limited, but is, for example, 30 μm or more and 150 μm or less.

[0026] The metal layer functions as a barrier layer. Examples of the metal used for the metal layer include aluminum, aluminum alloys, and stainless steel. The thickness of the metal layer is not particularly limited, but is, for example, 20 μm or more and 100 μm or less. Also, the laminate-type exterior body may have an outer resin layer on the side opposite to the inner resin layer with respect to the metal layer. The outer resin layer functions as an insulating layer or a protective layer. The outer resin layer preferably contains a thermoplastic resin. Examples of the thermoplastic resin include polyesters such as polyethylene terephthalate (PET) and nylon. The thickness of the outer resin layer is not particularly limited, but is, for example, 20 μm or more and 100 μm or less.

[0027] 2. Insertion step The insertion process in the present disclosure is a process of inserting the electrode body into the internal space of the exterior body through the opening of the exterior body. For example, in FIG. 1(a), by moving the electrode body 10 along the y direction with respect to the exterior body 20, the electrode body 10 can be inserted into the internal space IS through the opening O1.

[0028] The electrode body in the present disclosure functions as a power generation element of a battery. The electrode body usually has a rectangular shape. Further, the electrode body usually has a positive current collector, a positive electrode active material layer, an electrolyte layer, a negative electrode active material layer, and a negative current collector in this order in the thickness direction.

[0029] FIGS. 5(a) and 5(b) are schematic cross-sectional views illustrating the electrode body in the present disclosure. The electrode body 10 shown in FIG. 5(a) has a negative current collector 1, a negative electrode active material layer 2, an electrolyte layer 3, a positive electrode active material layer 4, and a positive current collector 5 in this order in the thickness direction (z direction). Further, the negative current collector 1 has a negative tab 1t for connection to a negative electrode terminal (not shown), and the positive current collector 5 has a positive tab 5t for connection to a positive electrode terminal (not shown).

[0030] The electrode body 10 shown in FIG. 5(b) has a negative current collector 1, a negative electrode active material layer 2x, an electrolyte layer 3x, a positive electrode active material layer 4x, and a positive current collector 5x arranged in this order in the thickness direction (z direction) from one surface of the negative current collector 1, and a negative electrode active material layer 2y, an electrolyte layer 3y, a positive electrode active material layer 4y, and a positive current collector 5y arranged in this order in the thickness direction (z direction) from the other surface of the negative current collector 1.

[0031] In FIGS. 5(a) and 5(b), the positive tab 5t and the negative tab 1t are arranged to face each other on the side surface of the electrode body 10, forming a so-called double tab structure. On the other hand, although not particularly shown, the positive tab and the negative tab may be arranged on the same side surface of the electrode body, forming a so-called single tab structure.

[0032] The positive electrode active material layer contains at least a positive electrode active material. The positive electrode active material layer may further contain at least one of an electrolyte, a conductive material, and a binder. Examples of the positive electrode active material include oxide active materials. Examples of the oxide active material include LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2, LiNi 0.8 Co 0.15 Al 0.05 O2 and other rock salt layer structured active materials, spinel structured active materials such as LiMn2O4, olivine structured active materials such as LiFePO4, etc. The shape of the positive electrode active material is, for example, particulate.

[0033] The electrolyte may be a solid electrolyte or a liquid electrolyte. The solid electrolyte may be an organic solid electrolyte such as a gel electrolyte, or an inorganic solid electrolyte such as a sulfide solid electrolyte or an oxide solid electrolyte. Among them, the solid electrolyte is preferably a sulfide solid electrolyte because of its high ionic conductivity. Examples of the conductive material include carbon materials. Examples of the binder include rubber-based binders and fluoride-based binders.

[0034] The negative electrode active material layer contains at least a negative electrode active material. The negative electrode active material layer may further contain at least one of an electrolyte, a conductive material, and a binder. Examples of the negative electrode active material include metal active materials such as Li, Si, Sn, etc., carbon active materials such as graphite, and oxide active materials such as Li4Ti5O 12 etc.

[0035] The negative electrode active material is preferably a Si-based active material because it can increase the capacity of the battery. The Si-based active material is an active material mainly composed of Si. The Si-based active material may be a single Si, a Si alloy, or a Si oxide. Also, the Si-based active material preferably has a clathrate II-type crystal phase because it can suppress volume changes due to charge and discharge. The shape of the negative electrode active material is, for example, particulate or foil-like. The electrolyte, conductive material, and binder are the same as described above.

[0036] The electrolyte layer is disposed between the positive electrode active material layer and the negative electrode active material layer and contains at least an electrolyte. The electrolyte may be a solid electrolyte or a liquid electrolyte. The electrolyte is the same as described above. The electrolyte layer may be a solid electrolyte layer containing a solid electrolyte. Further, the solid electrolyte is preferably a sulfide solid electrolyte. Generally, a battery having a solid electrolyte layer containing an inorganic solid electrolyte is referred to as an all-solid-state battery.

[0037] The positive electrode current collector collects current from the positive electrode active material layer. Examples of the material of the positive electrode current collector include metals such as aluminum, SUS, and nickel. Examples of the shape of the positive electrode current collector include a foil shape. The positive electrode current collector usually has a positive electrode tab for connecting to the positive electrode terminal. The negative electrode current collector collects current from the negative electrode active material layer. Examples of the material of the negative electrode current collector include metals such as copper, SUS, and nickel. Examples of the shape of the negative electrode current collector include a foil shape. The negative electrode current collector usually has a negative electrode tab for connecting to the negative electrode terminal. Further, the electrode body in the present disclosure may have an insulating film on at least a part of its surface in order to improve insulation. Also, the corners of the electrode body may be chamfered.

[0038] 3. Pressing step The pressing step in the present disclosure is a step of pressing at least one of the first surface and the second surface toward the electrode body in a state where the relative positions of the third surface and the fourth surface are fixed after the above insertion step, or in a state where at least one of the third surface and the fourth surface is pressed toward the electrode body.

[0039] As shown in FIGS. 2(a) and 2(b), when pressing at least one of the first surface S1 and the second surface S2 toward the electrode body 10, the relative positions of the third surface S3 and the fourth surface S4 may be fixed by the holding members 40c and 40d, respectively. Examples of the holding members 40c and 40d include molds. On the other hand, although not particularly shown, when pressing at least one of the first surface and the second surface toward the electrode body, at least one of the third surface and the fourth surface may be pressed toward the electrode body. At this time, one of the third surface and the fourth surface may be pressed toward the electrode body and the position of the other may be fixed. Also, both the third surface and the fourth surface may be pressed toward the electrode body.

[0040] In the pressing step, at least one of the first surface S1 and the second surface S2 is pressed toward the electrode body. Thereby, the gaps G1 and G2 (for example, the gaps G1 and G2 shown in FIG. 2(a)) can be reduced. In the present disclosure, one of the first surface and the second surface may be pressed toward the electrode body and the position of the other may be fixed. Also, both the first surface and the second surface may be pressed toward the electrode body. After the pressing step, the total of the gaps G1 and G2 is preferably 0.1 mm or less.

[0041] FIG. 6(a) is a schematic cross-sectional view illustrating the positional relationship between the electrode body and the exterior body before the pressing step, and FIG. 6(b) is a schematic cross-sectional view illustrating the positional relationship between the electrode body and the exterior body after the pressing step. As shown in FIG. 6(a), let the length in the thickness direction (z direction) of the electrode body 10 be H1, the length (inner dimension) in the thickness direction (z direction) of the exterior body 20 be H2, the length in the width direction (x direction) of the electrode body 10 be W1, and the length (inner dimension) in the width direction (x direction) of the exterior body 20 be W2. The difference between H2 and H1 is, for example, 0.10 mm or more and 0.80 mm or less, and may be 0.15 mm or more and 0.30 mm or less. The difference between W2 and W1 is, for example, 0.10 mm or more and 0.80 mm or less, and may be 0.15 mm or more and 0.30 mm or less.

[0042] As shown in FIG. 6(b), after the pressing process, gaps G3 and G4 may remain. By leaving gaps G3 and G4, it becomes easier to place the lid. On the other hand, although not particularly shown, gaps G3 and G4 may disappear. For example, when pressing at least one of the first surface and the second surface toward the electrode body, by pressing at least one of the third surface and the fourth surface toward the electrode body, gaps G3 and G4 can be made to disappear.

[0043] By the pressing process, the bending radius of the corner portions having a curved shape (for example, corner α shown in FIG. 2(a)) decreases (FIGS. 3(a) and (b)). Before the pressing process, the bending radius of the above corner portions is not particularly limited, but for example, it is 0.5 mm or more and 1.5 mm or less respectively. On the other hand, after the pressing process, the bending radius of the above corner portions is not particularly limited, but for example, it is 0.1 mm or more and 0.5 mm or less respectively. It is preferable that the bending radius of all (four) of the above corner portions α decreases before and after the pressing process.

[0044] 4. Lid Placement Process The lid placement process in the present disclosure is a process of placing the lid in the opening before or after the pressing process. The lid is a member used to seal the opening.

[0045] The material constituting the lid is not particularly limited, and examples include metals such as aluminum, aluminum alloy, stainless steel, iron, copper, and nickel. Also, a resin may be used as the material constituting the lid. Further, the lid may be a terminal. For example, in FIG. 1(c), lid 30A is a negative electrode terminal electrically connected to negative electrode tab 1t, and lid 30B is a positive electrode terminal electrically connected to positive electrode tab 5t. On the other hand, the lid may not have a terminal function. Although not particularly shown, a through hole may be provided in the lid, and a terminal may be arranged in the through hole. Also, the lid may be subjected to an insulation treatment (for example, insulation resin coating, insulation film attachment) on the surface facing the exterior body and the terminal.

[0046] 5. Battery Examples of the battery in the present disclosure include secondary batteries such as lithium ion secondary batteries. Examples of the applications of the battery include power sources for vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), battery electric vehicles (BEVs), gasoline vehicles, and diesel vehicles. In particular, it is preferably used as a driving power source for a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), or a battery electric vehicle (BEV). Further, the battery may be used as a power source for a moving body other than a vehicle (for example, a railway, a ship, or an aircraft), or may be used as a power source for an electric product such as an information processing device.

[0047] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are examples, and any configuration that has substantially the same configuration as the technical idea described in the claims of the present disclosure and exhibits the same operational effects is included in the technical scope of the present disclosure.

Example

[0048] [Example 1] Using a seamless tube, an exterior body (inner dimensions: 73.6 mm × 6.68 mm) as shown in Fig. 1(a) was prepared. Also, a metal piece (dimensions: 73.4 mm × 6.48 mm, without chamfering) mimicking the electrode body was prepared. Note that this metal piece mimics an electrode body without bending, undulating, or unevenness. When the metal piece was inserted into the exterior body manually, it could be assembled smoothly. Thereafter, with the relative positions of the third and fourth surfaces of the exterior body fixed, the first surface of the exterior body was pressed toward the metal piece. As a result, it was confirmed that the gaps G1 and G2 shown in Fig. 2(a) disappeared. Thereafter, lid bodies were respectively arranged at the two openings of the exterior body to obtain a simulated battery.

[0049] [Example 2] Using a seamless tube, an exterior body (inner dimensions: 73.6 mm × 6.68 mm) as shown in Fig. 1(a) was prepared. Also, a metal piece (dimensions: 73.5 mm × 6.58 mm, chamfered 0.5 mm at four corners) mimicking the electrode body was prepared. When the metal piece was inserted into the exterior body manually, it could be assembled smoothly. Then, with the relative positions of the third and fourth surfaces of the exterior body fixed, the first surface of the exterior body was pressed toward the metal piece. As a result, it was confirmed that the gaps G1 and G2 shown in Fig. 2(a) disappeared. Then, lid bodies were respectively placed on the two openings of the exterior body to obtain a simulated battery.

[0050] [Comparative Example 1] Using a seamless tube, an exterior body (inner dimensions: 73.6 mm × 6.68 mm) as shown in Fig. 1(a) was prepared. Also, a metal piece (dimensions: 73.6 mm × 6.68 mm, chamfered 0.5 mm at four corners) mimicking the electrode body was prepared. When the metal piece was inserted into the exterior body manually, it could not be assembled.

Explanation of Reference Signs

[0051] 1…Negative current collector 2…Negative active material layer 3…Electrolyte layer 4…Positive active material layer 5…Positive current collector 10…Electrode body 20…Exterior body 30…Lid body 40…Holding member 50…Pressing member

Claims

1. A method for manufacturing a battery, comprising an electrode body, an exterior body, and a lid body, The method for manufacturing the battery is as follows: A preparation step of preparing the exterior body that satisfies the following (i) to (iii); (i) The exterior body has a first surface, a second surface facing the first surface, a third surface connecting the first surface and the second surface, and a fourth surface connecting the first surface and the second surface and facing the third surface. (ii) The exterior body has an internal space formed by the first surface, the second surface, the third surface, and the fourth surface, and an opening located at an end of the internal space. (iii) The exterior body has a corner portion with a curved shape at at least one of both ends of the side formed by the third surface in a cross section perpendicular to the first surface and the third surface at an end of the exterior body, and a corner portion with a curved shape at at least one of both ends of the side formed by the fourth surface. An insertion step of inserting the electrode body into the internal space through the opening; After the insertion step, in a state where the relative positions of the third surface and the fourth surface are fixed, or in a state where at least one of the third surface and the fourth surface is pressed toward the electrode body, a pressing step of pressing at least one of the first surface and the second surface toward the electrode body; A lid body arranging step of arranging the lid body in the opening before or after the pressing step; A method for manufacturing a battery having the above steps.

2. The method for manufacturing a battery according to claim 1, wherein the exterior body has corner portions with the curved shape at both ends of the side formed by the third surface and corner portions with the curved shape at both ends of the side formed by the fourth surface in a cross section perpendicular to the first surface and the third surface at an end of the exterior body.

3. Before the pressing step, the bending radius of each of the four corner portions is 0.5 mm or more and 1.5 mm or less, After the pressing step, the bending radius of each of the four corner portions is 0.1 mm or more and 0.5 mm or less. The method for manufacturing a battery according to claim 2.

4. The method for manufacturing a battery according to claim 1, wherein the electrode body contains a solid electrolyte.

5. The method for manufacturing a battery according to claim 1, wherein the lid body arranging step is performed after the pressing step.

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