Battery manufacturing method

Abstract

The present disclosure provides a method for manufacturing a battery capable of obtaining a battery having good volumetric efficiency. A method for manufacturing a battery provided with an electrode body, an exterior body, and a lid body, the method comprising: a preparation step for preparing a predetermined exterior body; an insertion step for inserting the electrode body into the exterior body; a pressing step in which, after the insertion step, the exterior body is pressed under predetermined conditions; and a cover body arrangement step for arranging the cover body in the opening before or after the pressing step.

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, an electrode body is usually housed in an internal space of an outer package. For example, Japanese Unexamined Patent Application Publication No. 2022-180650 discloses a square secondary battery having: a flat wound electrode body formed by winding a positive electrode plate and a negative electrode plate with a separator interposed therebetween; a square outer package having an opening and housing the wound electrode body; and a sealing plate for sealing the opening. Further, Japanese Unexamined Patent Application Publication No. 2022-180650 discloses that the square outer package 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] Japanese Unexamined Patent Application Publication No. 2023-062732 discloses a method for manufacturing a battery having a fitting step and a joining step, and discloses that in the joining step, a pair of first side walls are pressed into the interior of the outer package and the outer package and the sealing plate are joined. In addition, Japanese Unexamined Patent Application Publication No. 2016-110777 discloses a method for manufacturing a lithium ion secondary battery, which has a pre-doping step of performing lithium pre-doping and a charging step of performing a first charge in a state where a unit is pressurized. Summary of the Invention

[0004] The square outer package in Japanese Unexamined Patent Application Publication No. 2022-180650 has a bottom wall, a pair of first side walls, a pair of second side walls, and an opening. When an electrode body is inserted into the internal space of such an outer package through the opening, it is necessary to make the size of the opening larger than the size of the electrode body. Along with this, the volume of the internal space of the outer package is usually also larger than the volume of the electrode body. As a result, a remaining gap is generated in the internal space of the outer package, and thus the volume efficiency of the battery decreases.

[0005] The present disclosure has been made in view of the above actual situation, and a main object thereof is to provide a method for manufacturing a battery that can obtain a battery with good volume efficiency.

[0006] Aspect 1

[0007] A method for manufacturing a battery,

[0008] The above battery includes an electrode body, an outer package, and a lid body,

[0009] The method for manufacturing the above battery has:

[0010] A preparation step of preparing the above outer package that satisfies the following (i) to (iii),

[0011] (i) The outer package has a first surface, a second surface opposite to 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 opposite to the third surface.

[0012] (ii) The outer package has an internal space formed by the first surface, the second surface, the third surface, and the fourth surface, and an opening at an end of the internal space.

[0013] (iii) In a cross-section perpendicular to the first surface and the third surface at an end of the outer package, at least one of the two ends of the side formed by the third surface has a corner portion with a curved shape, and at least one of the two ends of the side formed by the fourth surface has a corner portion with a curved shape.

[0014] An insertion process of inserting the electrode body into the internal space through the opening.

[0015] After the insertion process, a pressing process of pressing at least one of the first surface and the second surface against the electrode body 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 against the electrode body; and

[0016] A cover body arranging process of arranging the cover body at the opening before or after the pressing process.

[0017] Method 2

[0018] In the method for manufacturing a battery according to Method 1,

[0019] In a cross-section perpendicular to the first surface and the third surface at an end of the outer package, the two ends of the side formed by the third surface respectively have the corner portions with the curved shape, and the two ends of the side formed by the fourth surface respectively have the corner portions with the curved shape.

[0020] Method 3

[0021] In the method for manufacturing a battery according to Method 2,

[0022] Before the pressing process, the bending radii of the four corner portions are respectively 0.5 mm or more and 1.5 mm or less.

[0023] After the pressing process, the bending radii of the four corner portions are respectively 0.1 mm or more and 0.5 mm or less.

[0024] Method 4

[0025] In the method for manufacturing a battery according to any one of Modes 1 to 3,

[0026] The electrode body includes a solid electrolyte.

[0027] Mode 5

[0028] In the method for manufacturing a battery according to any one of Modes 1 to 4,

[0029] After the pressing step, the lid body placement step is performed.

[0030] In the present disclosure, an effect of obtaining a battery with good volumetric efficiency is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings, where the same reference numerals denote the same elements.

[0032] Figure 1A is a schematic perspective view illustrating the method for manufacturing the battery of the present disclosure.

[0033] Figure 1B is a schematic perspective view illustrating the method for manufacturing the battery of the present disclosure.

[0034] Figure 1C is a schematic cross-sectional view illustrating the method for manufacturing the battery of the present disclosure.

[0035] Figure 1D is a schematic cross-sectional view illustrating the method for manufacturing the battery of the present disclosure.

[0036] Figure 2A is a schematic cross-sectional view illustrating the method for manufacturing the battery of the present disclosure.

[0037] Figure 2B is a schematic cross-sectional view illustrating the method for manufacturing the battery of the present disclosure.

[0038] Figure 2C is a schematic cross-sectional view illustrating the method for manufacturing the battery of the present disclosure.

[0039] Figure 2D is a schematic cross-sectional view illustrating the method for manufacturing the battery of the present disclosure.

[0040] Figure 3A is Figure 2A an enlarged view of a part of

[0041] Figure 3B is Figure 2D an enlarged view of a part of

[0042] Figure 4A is a schematic cross-sectional view illustrating the effect of the present disclosure.

[0043] Figure 4B is a schematic cross-sectional view illustrating the effects of the present disclosure.

[0044] Figure 5A is a schematic cross-sectional view illustrating the electrode body of the present disclosure.

[0045] Figure 5B is a schematic cross-sectional view illustrating the electrode body of the present disclosure.

[0046] Figure 6A is a schematic cross-sectional view illustrating the positional relationship between the electrode body and the outer package before and after the pressing process.

[0047] Figure 6B is a schematic cross-sectional view illustrating the positional relationship between the electrode body and the outer package before and after the pressing process. Detailed Description of the Invention

[0048] Hereinafter, the manufacturing method of the battery of the present disclosure will be described in detail with reference to the accompanying drawings. Each of the drawings shown below is a schematic diagram, and for ease of understanding, the sizes and shapes of the respective parts are appropriately exaggerated. In addition, in this specification, the manner of disposing other members with respect to a certain member is expressed as follows. In the case of simply stating "on..." or "under...", unless otherwise specified, it includes both the case of disposing other members directly above or directly below a certain member in contact therewith, and the case of disposing other members above or below a certain member with another member interposed therebetween.

[0049] Figure 1A and Figure 1B is a schematic perspective view illustrating the manufacturing method of the battery of the present disclosure. Figure 1C and Figure 1D is a schematic cross-sectional view illustrating the manufacturing method of the battery of the present disclosure. Specifically, Figure 1A is a schematic perspective view illustrating each member constituting the battery. Figure 1B is a schematic perspective view illustrating the battery of the present disclosure. Figure 1C is in the y-z plane Figure 1B The schematic cross-sectional view of the battery shown is cut. Figure 1D is Figure 1C The ID-ID cross-sectional view of. Furthermore, in Figure 1A , for convenience, the positive electrode tab (for example, Figure 1C The positive electrode tab 5t in) and the negative electrode tab (for example, Figure 1C The negative electrode tab 1t in) are not shown.

[0050] In the manufacturing method of the battery of the present disclosure, first, as Figure 1A shown, an outer package 20 is prepared (preparation process). The outer package 20 satisfies the following (i) to (iii). Specifically, (i) The outer package 20 has a first surface S1 , and the first surface S 1 The second side S 2 , the first side S 1 and the second side S 2 Linked 3rd side S 3 , and the first side S 1 and the second side S 2 Connect and connect with the 3rd side S 3 Opposite 4th side S 4 In addition, (ii) the outer casing 20 has: 1 、S on the 2nd side 2 、3rd side S 3 and Surface 4 S 4 The internal space IS formed by the inner space IS and the opening O (O 1 , O 2 ). Furthermore, (iii) as described below Figure 3A As shown in FIG. 1 , the outer casing 20 has a curved corner α. The corner α is formed at the end of the outer casing 20 and is adjacent to the first surface S. 1 and S on the 3rd side 3 The vertical cross section is arranged on the third surface S 3 In addition, although not particularly shown in the figure, the outer casing also has a corner portion in a curved shape at least one of the two ends of the side formed by the fourth side.

[0051] Then, if Figure 1A As shown, the electrode assembly 10 is inserted into the internal space IS of the outer casing 20 through the opening O of the outer casing 20 (insertion step). Figure 1A The electrode body 10 shown has a square shape. Figure 2A As shown in FIG. 1 , when the electrode body 10 is inserted into the outer casing 20 , the second surface S of the electrode body 10 and the outer casing 20 is 2 Gap G 2 . Gap G 2 The gap is caused by the surface state of the electrode body 10 (e.g., curvature, undulation, or unevenness). Although not specifically shown in the figure, due to the weight of the electrode body, a portion of the electrode body is in contact with the second surface of the outer casing. Figure 2A As shown, the first surface S of the electrode body 10 and the outer package 20 1 Gap G 1 . Gap G 1 The gap is the sum of the gap caused by the surface state of the electrode body 10 and the gap required to insert the electrode body 10 into the outer casing 20. In addition, in order to insert the electrode body 10 into the outer casing 20, the third surface S of the electrode body 10 and the outer casing 20 is 3 Gap G3 , a gap G is generated between the fourth surface S of the electrode body 10 and the outer package body 20 4 . 4 .

[0052] Next, as shown in Figure 2B , the electrode body 10 and the outer package body 20 are placed on the holding member 40b. With the relative positions of the third surface S 3 and the fourth surface S 4 fixed by the holding members 40c and 40d, the first surface S is pressed against the electrode body 10 by the pressing member 50 1 (pressing step). As a result, as shown in Figure 2C and Figure 2D , the gaps G 1 and G 2 disappear. In this way, through the pressing step, the gaps G 1 and G 2 can be reduced. In addition, Figure 3A is an enlarged view of the corner α shown in Figure 2A , and Figure 3B is an enlarged view of the corner α shown in Figure 2D . As shown in Figure 3A and Figure 3B , through the pressing step, the bending radius of the corner α becomes smaller, and as a result, the remaining part of the outer package body 20 is absorbed. Next, as shown in Figure 1B , the lid body 30 (30A, 30B) is arranged in the opening O (O 1 , O 2 ) (lid body arrangement step). Thereby, the battery 100 is obtained.

[0053] According to the present disclosure, by performing a predetermined pressing step, the gaps G 1 and G 2 can be reduced, and a battery with good volumetric efficiency can be obtained. As described above, when the electrode body is inserted into the inner space of the outer package body through the opening, it is necessary to make the size of the opening larger than the size of the electrode body. Along with this, the volume of the inner space of the outer package body is usually also larger than the volume of the electrode body. As a result, a remaining gap is generated in the inner space of the outer package body. Therefore, for example Figure 4A shown, the volumetric efficiency of the battery 100 decreases. In contrast, according to the present disclosure, by performing a predetermined pressing step, the gaps G 1 and G 2 can be reduced. Therefore, for example Figure 4B shown, a battery 100 with good volumetric efficiency can be obtained. Moreover, since the gaps G 1 and G 2 have heat insulation properties, if there are gaps G 1 and G 2, the heat dissipation of the battery becomes low. In contrast, in the present disclosure, by reducing the gap G 1 , G 2 , the heat dissipation of the battery can be improved. In addition, as Figure 2B and Figure 2C show, sometimes the first surface S 1 is pressed by the pressing member 50 having a flat surface. In this case, the surface state (e.g., bending, undulation, unevenness) of the electrode body 10 can be made flat, and the volumetric efficiency of the battery can be further improved.

[0054] 1. Preparation process

[0055] The preparation process in the present disclosure is a process of preparing the above-mentioned outer package that satisfies the following (i) to (iii).

[0056] As Figure 1A shows, (i) the outer package 20 has: a first surface S 1 , a second surface S 1 opposite to the first surface S 2 , a third surface S 1 connecting the first surface S 2 and the second surface S 3 , and a fourth surface S 1 connecting the first surface S 2 and the second surface S 3 and opposite to the third surface S 4 . The first surface S 1 and the second surface S 2 usually correspond to the main surfaces, and the third surface S 3 and the fourth surface S 4 usually correspond to the side surfaces.

[0057] In addition, as Figure 1A shows, (ii) the outer package 20 has: an internal space IS formed by the first surface S 1 , the second surface S 2 , the third surface S 3 and the fourth surface S 4 , and an opening O (O 1 , O 2 ) located at the end of the internal space IS. Figure 1A The outer package 20 shown has two openings O 1 , O 2 opposite to each other. On the other hand, although not particularly shown, the outer package may also have only one opening. In this case, the outer package may have a fifth surface instead of Figure 1A the opening O 2 shown.

[0058] In addition, as Figure 1A andFigure 3A As shown in (iii), the outer package 20 has a corner α with a curved shape. The corner α is in a cross-section perpendicular to the first surface S at the end of the outer package 20 1 and the third surface S 3 and is disposed at at least one of the two end portions of the side formed by the third surface S 3 In addition, the corner α is disposed at at least one of the two end portions of the side formed by the fourth surface S 4 The outer package in the present disclosure has a corner with a curved shape at at least one of the two end portions of the side formed by the third surface, and may have corners at both end portions of the side formed by the third surface respectively. Similarly, the outer package of the present disclosure has a corner with a curved shape at at least one of the two end portions of the side formed by the fourth surface, and may have corners at both end portions of the side formed by the fourth surface respectively.

[0059] The outer package of the present disclosure can be a housing-type outer package or a laminated-type outer package. The housing-type outer package is, for example, a metal outer package. As the material constituting the housing-type outer package, for example, aluminum, aluminum alloy (such as A1050-H18, A3003-H18) can be cited. In addition, a material obtained by plastically working and work-hardening aluminum or aluminum alloy (such as A1050-O, A3003-O) can also be used. In addition, the thickness of the housing-type outer package is not particularly limited and can be selected to obtain the desired rigidity. In addition, the housing-type outer package can also be subjected to an insulation treatment (such as insulation resin coating, insulation film attachment, corrosion-resistant aluminum treatment) on the surface facing the electrode body or the cover body.

[0060] The laminated-type outer package, also known as a soft-pack type outer package, is an outer package using a laminated film. The laminated-type outer package 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. As the above-mentioned thermoplastic resin, for example, polyolefins such as polyethylene and polypropylene, polystyrene, and polyvinyl chloride can be cited. The thickness of the inner resin layer is not particularly limited, for example, it is 30 μm or more and 150 μm or less.

[0061] The metal layer functions as a barrier layer. As the metal used for the metal layer, for example, aluminum, aluminum alloy, and stainless steel can be cited. The thickness of the metal layer is not particularly limited, for example, it is 20 μm or more and 100 μm or less. In addition, the laminated-type outer package may have an outer resin layer on the opposite side of 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. As the above-mentioned thermoplastic resin, polyesters such as polyethylene terephthalate (PET) and nylon can be cited. The thickness of the outer resin layer is not particularly limited, for example, it is 20 μm or more and 100 μm or less.

[0062] 2. Insertion process

[0063] The insertion process of the present disclosure is a process of inserting the above electrode body into the above internal space of the above outer package through the above opening of the above outer package. For example, in Figure 1A , by moving the electrode body 10 relative to the outer package 20 in the y direction, the electrode body 10 can be inserted into the internal space IS through the opening O 1 .

[0064] The electrode body of the present disclosure functions as a power generation element of a battery. The electrode body generally has a square shape. In addition, the electrode body generally has a positive current collector, a positive active material layer, an electrolyte layer, a negative active material layer, and a negative current collector in this order in the thickness direction.

[0065] Figure 5A And Figure 5B are schematic cross-sectional views illustrating the electrode body of the present disclosure. Figure 5A The illustrated electrode body 10 has a negative current collector 1, a negative active material layer 2, an electrolyte layer 3, a positive active material layer 4, and a positive current collector 5 in this order in the thickness direction (z direction). In addition, the negative current collector 1 has a negative tab 1t for connecting to a negative terminal (not shown), and the positive current collector 5 has a positive tab 5t for connecting to a positive terminal (not shown).

[0066] Figure 5B The illustrated electrode body 10 has a negative current collector 1, a negative active material layer 2x, an electrolyte layer 3x, a positive active material layer 4x, and a positive current collector 5x, and a negative active material layer 2y, an electrolyte layer 3y, a positive active material layer 4y, and a positive current collector 5y. The negative active material layer 2x, the electrolyte layer 3x, the positive active material layer 4x, and the positive current collector 5x are arranged in this order in the thickness direction (z direction) starting from one surface of the negative current collector 1. The negative active material layer 2y, the electrolyte layer 3y, the positive active material layer 4y, and the positive current collector 5y are arranged in this order in the thickness direction (z direction) starting from the other surface of the negative current collector 1.

[0067] Furthermore, in Figure 5A and Figure 5B , the positive tab 5t and the negative tab 1t are arranged so as to face each other on the side surface of the electrode body 10, forming a so-called bipolar tab structure. On the other hand, although not particularly illustrated, the positive tab and the negative tab may be arranged on the same side surface of the electrode body to form a so-called unipolar tab structure.

[0068] The positive active material layer contains at least a positive active material. The positive active material layer may further contain at least one of an electrolyte, a conductive material, and a binder. As the positive active material, for example, an oxide active material can be cited. As the oxide active material, for example, LiNi 1 / 3Co 1 / 3 Mn 1 / 3 O 2 、LiNi 0.8 Co 0.15 Al 0.05 O 2 Rock salt layered active materials, LiMn 2 O 4 Spinel active materials, LiFePO 4 The shape of the positive electrode active material is, for example, granular.

[0069] 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 it has high ion conductivity. In addition, as a conductive material, for example, a carbon material can be mentioned. In addition, as an adhesive, for example, a rubber adhesive and a fluoride adhesive can be mentioned.

[0070] 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, and Sn, carbon active materials such as graphite, and Li 4 Ti 5 O 12 Oxidant active substances.

[0071] The negative electrode active material is preferably a Si-based active material. This is because it can achieve a high capacity of the battery. Si-based active materials are active materials with Si as the main component. Si-based active materials can be Si alone, Si alloys, or Si oxides. In addition, Si-based active materials preferably have a inclusion compound II type crystal phase. This is because it can suppress the volume change caused by charging and discharging. The shape of the negative electrode active material is, for example, granular or foil-shaped. Regarding the electrolyte, conductive material and binder, the same as above.

[0072] 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. Regarding the electrolyte, the same as above. The electrolyte layer may also be a solid electrolyte layer containing a solid electrolyte. In addition, the solid electrolyte is preferably a sulfide solid electrolyte. In addition, a battery having a solid electrolyte layer containing an inorganic solid electrolyte is generally referred to as a fully solid battery.

[0073] The positive electrode current collector collects current from the positive electrode active material layer. Examples of materials for 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 connection to the positive electrode terminal. In addition, the negative electrode current collector collects current from the negative electrode active material layer. Examples of materials for 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 connection to the negative electrode terminal. In addition, in order to improve insulation, the electrode body of the present disclosure may have an insulating film on at least a part of its surface. In addition, the corners of the electrode body may be chamfered.

[0074] 3. Pressing step

[0075] The pressing step of the present disclosure is a step of pressing at least one of the first surface and the second surface against the electrode body. The pressing step is performed 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 against the electrode body.

[0076] As Figure 2A and Figure 2B shown, when pressing at least one of the first surface S 1 and the second surface S 2 against the electrode body 10, the relative positions of the third surface S 3 and the fourth surface S 4 can also be fixed by the holding members 40c and 40d respectively. Examples of the holding members 40c and 40d include metal molds. On the other hand, although not particularly shown, when pressing at least one of the first surface and the second surface against the electrode body, at least one of the third surface and the fourth surface can also be pressed against the electrode body. At this time, one of the third surface and the fourth surface can be pressed against the electrode body and the position of the other can be fixed. In addition, both the third surface and the fourth surface can be pressed against the electrode body.

[0077] In the pressing step, at least one of the first surface S 1 and the second surface S 2 is pressed against the electrode body. Thereby, the gaps G 1 , G 2 (for example Figure 2A the gaps G 1 , G 2 ) can be reduced. In the present disclosure, one of the first surface and the second surface can be pressed against the electrode body and the position of the other can be fixed. In addition, both the first surface and the second surface can be pressed against the electrode body. After the pressing step, the gaps G 1 , G 2The total is preferably 0.1 mm or less.

[0078] Figure 6A FIG. is a schematic cross-sectional view showing the positional relationship between the electrode body and the outer package before the pressing process. Figure 6B FIG. is a schematic cross-sectional view showing the positional relationship between the electrode body and the outer package after the pressing process. As Figure 6A shown, the length of the electrode body 10 in the thickness direction (z direction) is set to H 1 . The length (inner dimension) of the outer package 20 in the thickness direction (z direction) is set to H 2 . The length of the electrode body 10 in the width direction (x direction) is set to W 1 . The length (inner dimension) of the outer package 20 in the width direction (x direction) is set to W 2 . H 2 and H 1 The difference is, for example, 0.10 mm or more and 0.80 mm or less, and may also be 0.15 mm or more and 0.30 mm or less. W 2 and W 1 The difference is, for example, 0.10 mm or more and 0.80 mm or less, and may also be 0.15 mm or more and 0.30 mm or less.

[0079] As Figure 6B shown, after the pressing process, the gaps G 3 and the gap G 4 may also remain. By allowing the gaps G 3 and the gap G 4 to remain, it becomes easier to dispose the lid. On the other hand, although not particularly shown, the gap G 3 and the gap G 4 may also disappear. For example, when pressing at least one of the first surface and the second surface against the electrode body, by pressing at least one of the third surface and the fourth surface against the electrode body, the gaps G 3 and the gap G 4 can be made to disappear.

[0080] By the pressing process, the bending radius of the bent corner (for example, Figure 2A the corner α shown) decreases ( Figure 3A and Figure 3B ). Before the pressing process, the bending radius of the above-mentioned corner is not particularly limited, for example, it is 0.5 mm or more and 1.5 mm or less. On the other hand, after the pressing process, the bending radius of the above-mentioned corner is not particularly limited, for example, it is 0.1 mm or more and 0.5 mm or less. Before and after the pressing process, it is preferable that the bending radii of all (4) of the above-mentioned corners α decrease.

[0081] 4. Lid Disposal Process

[0082] The lid body arranging step of the present disclosure is a step of arranging the lid body at the opening portion before or after the pressing step described above. The lid body is a member for sealing the opening portion.

[0083] The material constituting the lid body is not particularly limited, and examples thereof include metals such as aluminum, aluminum alloy, stainless steel, iron, copper, and nickel. In addition, as the material constituting the lid body, a resin may also be used. In addition, the lid body may also be a terminal. For example, in Figure 1C , the lid body 30A is a negative terminal electrically connected to the negative electrode tab 1t, and the lid body 30B is a positive terminal electrically connected to the positive electrode tab 5t. On the other hand, the lid body may not have a terminal function. Although not particularly illustrated, a through hole may be provided in the lid body, and a terminal may be arranged in the through hole. In addition, the lid body may be subjected to an insulation treatment (for example, coating with an insulating resin, attaching an insulating film) on the surface facing the exterior body and the terminal.

[0084] 5. Battery

[0085] As the battery of the present disclosure, for example, a secondary battery such as a lithium ion secondary battery can be cited. In addition, as the use of the battery, for example, a power source for vehicles such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a battery electric vehicle (BEV), a gasoline vehicle, and a diesel vehicle can be cited. It is particularly preferably used as a drive power source for a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), or a battery electric vehicle (BEV). In addition, the battery can be used as a power source for a moving body other than a vehicle (for example, a railway, a ship, an airplane), or can also be used as a power source for an electric product such as an information processing device.

[0086] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are illustrative, and a solution having substantially the same technical idea as that described in the claims of the present disclosure and a solution having the same function and effect are all included in the technical scope of the present disclosure.

[0087] Example 1

[0088] Using a seamless tube, an exterior body as shown in Figure 1A (inner dimensions: 73.6 mm × 6.68 mm) was prepared. In addition, a metal sheet simulating an electrode body (dimensions: 73.4 mm × 6.48 mm, without chamfer) was prepared. Furthermore, this metal sheet simulated an electrode body without bending, undulation, or unevenness. After inserting the metal sheet into the exterior body by manual operation, it could be assembled smoothly. Then, with the relative positions of the third surface and the fourth surface of the exterior body fixed, the first surface of the exterior body was pressed against the metal sheet. As a result, the gap G Figure 2A as shown in 1 , G 2It disappeared. Then, lids were respectively arranged at two opening portions of the outer package to obtain a simulated battery.

[0089] Example 2

[0090] Using a seamless tube, an outer package as shown in Figure 1A was prepared (inner dimensions: 73.6 mm × 6.68 mm). In addition, a metal sheet simulating an electrode body (dimensions: 73.5 mm × 6.58 mm, with C-plane chamfers of 0.5 mm at four corners) was prepared. After the metal sheet was inserted into the outer package by manual operation, it could be assembled smoothly. Then, with the relative positions of the third and fourth sides of the outer package fixed, the first side of the outer package was pressed against the metal sheet. As a result, it was confirmed that the gaps G Figure 2A shown in 1 , G 2 disappeared. Then, lids were respectively arranged at two opening portions of the outer package to obtain a simulated battery.

[0091] Comparative Example 1

[0092] Using a seamless tube, an outer package as shown in Figure 1A was prepared (inner dimensions: 73.6 mm × 6.68 mm). In addition, a metal sheet simulating an electrode body (dimensions: 73.6 mm × 6.68 mm, with C-plane chamfers of 0.5 mm at four corners) was prepared. The metal sheet was inserted into the outer package by manual operation, but as a result, it could not be assembled.

Claims

1. A method for manufacturing a battery, The battery comprises an electrode body, an outer body and a cover body. The manufacturing method of the battery comprises: A step of preparing the outer casing satisfying the following (i) to (iii), (i) the outer casing has a first surface, a second surface opposite to 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 opposite to the third surface, (ii) the outer casing 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 outer casing has a cross section perpendicular to the first surface and the third surface at an end of the outer casing, wherein at least one of the ends of a side formed by the third surface has a curved corner, and at least one of the ends of a side formed by the fourth surface has a curved corner; inserting the electrode body into the internal space through the opening; After the inserting step, a pressing step of pressing at least one of the first surface and the second surface against the electrode body 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 against the electrode body; and A cover body placement step of placing the cover body at the opening is performed before or after the pressing step.

2. The method for manufacturing a battery according to claim 1, The outer casing has the curved corners at both ends of the side formed by the third side in a cross section perpendicular to the first side and the third side at the end of the outer casing, and has the curved corners at both ends of the side formed by the fourth side.

3. The method for manufacturing a battery according to claim 2, Before the pressing step, the bending radii of the four corners are respectively greater than or equal to 0.5 mm and less than or equal to 1.5 mm. After the pressing step, the bending radii of the four corners are each greater than or equal to 0.1 mm and less than or equal to 0.5 mm.

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

5. The method for manufacturing a battery according to claim 1, After the pressing step, the cover body disposing step is performed.

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