Method of manufacturing battery, and battery

Abstract

To provide a method of manufacturing a battery, and a battery, enabling an electrode body to be impregnated with an electrolyte by a simple method.SOLUTION: A method of manufacturing a battery 10 includes: a first step of arranging an electrode body 30 in the internal space of outer casing bodies 20A and 20B; a second step of supplying an electrolyte to the internal space of the outer casing bodies 20A and 20B in which the electrode body 30 is arranged; and a third step of compressing a portion corresponding to the circumference of the electrode body 30 of the outer casing bodies 20A and 20B to which the electrolyte has been supplied. The inner volume of the internal space of the outer casing bodies 20A and 20B is larger than the volume of the electrode body 30.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] Lithium-ion secondary batteries are generally manufactured by injecting an electrolyte into an exterior housing that houses an electrode assembly including electrodes and a separator. The electrode assembly is pressed under high pressure to increase the electrode density, or the electrodes and the separator are joined with an adhesive or the like. This makes it difficult for the electrolyte to permeate the electrode assembly, and improving the efficiency of the electrolyte injection process has become an issue.

[0003] As a method for improving the permeability of an electrolyte into an electrode assembly, for example, Patent Document 1 proposes providing a region where the electrode and separator are not bonded when bonding the electrodes and separator that constitute the electrode assembly. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-15773 A Summary of the Invention [Problem to be solved by the invention]

[0005] The method described in Patent Document 1 requires a step of providing a portion where the electrode and the separator are not bonded in order to increase the permeability of the electrolyte, and therefore has room for improvement in terms of work efficiency. An object of one embodiment of the present disclosure is to provide a battery manufacturing method and a battery that can easily permeate an electrolyte into an electrode body. [Means for solving the problem]

[0006] Means for solving the above problems include the following embodiments. <1> A first step of disposing an electrode assembly in an internal space of an exterior body; A second step of supplying an electrolyte solution into an internal space of the exterior body in which the electrode body is disposed; and a third step of compressing a portion of the exterior body to which the electrolyte has been supplied, the portion corresponding to the periphery of the electrode body, A method for manufacturing a battery, wherein the volume of the internal space of the exterior body is larger than the volume of the electrode body. <2> The pressure is applied so that the electrolyte present around the electrode body moves toward the electrode body. <1> A method for manufacturing the battery according to claim 1. <3> Simultaneously with or after the pressing, a portion of the exterior body corresponding to the periphery of the electrode body is folded toward one of the main surfaces of the battery. <1> or <2> A method for manufacturing the battery according to claim 1. <4> a first exterior body, a second exterior body, and an electrode body disposed between the first exterior body and the second exterior body; The first and second exterior bodies each have a region X that is in contact with the electrode body and a region Y that is not in contact with the electrode body, A battery, wherein region Y is composed of region Y1 where the first exterior body and the second exterior body are joined, and region Y2 where the first exterior body and the second exterior body are not joined. <5> The area of ​​region Y2 is 5% or more of the area of ​​region X. <4> 2. The battery according to claim 1 . <6> The area of ​​the region Y2 is 5% or more of the area of ​​the region Y1. <4> or <5> 2. The battery according to claim 1 . <7> Region Y of the first exterior body and the second exterior body is folded toward one of the main surfaces of the battery. <4> ~ <6> 13. The battery according to any one of claims 1 to 12. Effect of the Invention

[0007] According to one embodiment of the present disclosure, a manufacturing method of a battery and a battery capable of permeating an electrolyte into an electrode body in a simple manner are provided. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view illustrating an example of a battery configuration. [Diagram 2] FIG. 1 is a cross-sectional view illustrating an example of a battery configuration. [Diagram 3]FIG. 1 is a cross-sectional view illustrating an example of a battery configuration. [Figure 4] FIG. 1 is a plan view illustrating an example of a battery configuration. [Diagram 5] FIG. 1 is a cross-sectional view illustrating an example of a battery configuration. [Figure 6] FIG. 1 is a cross-sectional view illustrating an example of a battery configuration. [Figure 7] FIG. 1 is a diagram illustrating an example of an application of a battery to an electric vehicle. [Figure 8] FIG. 2 is a diagram illustrating an example of a configuration of a battery module. [Figure 9] FIG. 2 is a diagram illustrating an example of a configuration of a battery module. [Figure 10] 2 is a diagram illustrating an example of a configuration of a battery cell included in a battery module. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In the present disclosure, a numerical range indicated using "~" means a range that includes the numerical values ​​before and after "~" as the minimum and maximum values, respectively. In the numerical ranges described in the present disclosure, the upper or lower limit value described in a certain numerical range may be replaced with the upper or lower limit value of another numerical range described in the present disclosure. In the numerical ranges described in the present disclosure, the upper or lower limit value described in a certain numerical range may be replaced with a value shown in the examples. In the present disclosure, the term "process" refers not only to an independent process, but also to a process that cannot be clearly distinguished from other processes, as long as the intended purpose of the process is achieved. When an embodiment of the present disclosure is described with reference to the drawings, the configuration of the embodiment is not limited to the configuration shown in the drawings. In addition, the size of the members in each drawing is conceptual, and the relative relationship between the sizes of the members is not limited to this.

[0010] <Battery manufacturing method> The first embodiment of the present disclosure is A first step of disposing an electrode assembly in an internal space of an exterior body; A second step of supplying an electrolyte solution into an internal space of the exterior body in which the electrode body is disposed; and a third step of compressing a portion of the exterior body to which the electrolyte has been supplied that corresponds to the periphery of the electrode body, This is a method for manufacturing a battery, in which the volume of the internal space of the exterior body is larger than the volume of the electrode body.

[0011] In conventional battery manufacturing methods, the volume of the internal space of the exterior body for housing the electrode body is almost equal to the volume of the electrode body. In addition, it takes a certain amount of time for the electrolyte to permeate the electrode body. Therefore, it is difficult to supply the amount of electrolyte that will ultimately permeate the electrode body to the internal space of the exterior body in a single injection operation. For this reason, in the conventional method, a first injection step is performed to supply an amount of electrolyte that does not exceed the volume of the internal space of the exterior body, and then the electrode body is waited for the electrolyte to permeate, after which a second injection step is performed to allow a sufficient amount of electrolyte to permeate the electrode body.

[0012] The method of the present disclosure uses an exterior body whose internal space has a volume larger than the volume of the electrode assembly, which allows the amount of electrolyte that will ultimately permeate the electrode assembly to be injected in a single injection operation.

[0013] In the method of the present disclosure, the volume of the internal space of the exterior body used in the manufacture of the battery is larger than the volume of the electrode body. Therefore, when the electrolyte injection work is completed, the electrolyte that has not yet permeated into the electrode body is present around the electrode body. Therefore, after the electrolyte injection work, the part of the exterior body that corresponds to the periphery of the electrode body is pressed. This moves the electrolyte present around the electrode body to the electrode body side, promoting the permeation of the electrolyte.

[0014] According to the method of the present disclosure, for example, the efficiency of the liquid injection operation can be improved without subjecting the electrode body to processing for increasing the permeability of the electrolyte. Each step included in the method of the present disclosure will now be described.

[0015] (1st step) In the first step, the electrode body is disposed in an internal space of an exterior body having an internal space with a volume larger than the volume of the electrode body. The type of the exterior body is not particularly limited as long as it can accommodate the electrode body. From the viewpoint of compressing the portion of the exterior body to which the electrolyte is supplied that corresponds to the periphery of the electrode body, the exterior body is preferably a thin, flexible sheet-like material.

[0016] The exterior body may be made of one member or two or more members. For example, when the exterior body is a sheet-like material, the exterior body may be made of one sheet-like material or two sheet-like materials.

[0017] The exterior body may be a laminate (so-called laminate film) having a metal layer containing a metal such as aluminum and a heat seal layer. That is, the battery produced by the method of the present disclosure may be a battery using a laminate film as the exterior body (so-called laminate battery).

[0018] Methods for carrying out the first step when a laminate film is used as the exterior body include, for example, a method in which the electrode body is placed between a single laminate film folded in half or between two overlapping laminate films, and the laminate film around the electrode body is joined by heat sealing; and a method in which the periphery of a single laminate film folded in half or two overlapping laminate films is joined by heat sealing, and the electrode body is placed in the space surrounded by the joint portion of the laminate films. If necessary, the laminate film may be formed with a recess for accommodating the electrode body.

[0019] The type of electrode body is not particularly limited and can be selected according to the scale and application of the battery. The electrode assembly may be, for example, a laminate in which electrodes (negative and positive electrodes) and a separator disposed between the electrodes are laminated. The number of electrodes and separators included in the electrode assembly is not particularly limited and can be selected according to the size and application of the battery. As the electrode, for example, one in which a layer containing an electrode active material is formed on one or both sides of a current collector can be used. As the separator, for example, a microporous film made of a resin such as polyethylene can be used.

[0020] (2nd process) In the second step, an electrolyte is supplied to the internal space of the exterior body in which the electrode body is disposed. The method for supplying the electrolyte to the internal space of the exterior body is not particularly limited, and can be carried out by a known method. The second step may be carried out, for example, in a state where the exterior body containing the electrode assembly is arranged so that the opening (electrolyte injection port) of the exterior body is on the upper side when viewed in the direction of gravity. From the viewpoint of enhancing the permeability of the electrolyte solution into the electrode assembly, the internal space of the exterior body may be depressurized before the electrolyte solution is supplied.

[0021] In the second step, the electrolyte may be supplied to the internal space of the exterior body in one go or in multiple gos. From the viewpoint of improving the efficiency of the liquid injection operation, it is preferable to supply the electrolyte to the internal space of the exterior body in one go. In other words, it is preferable to design the volume of the internal space of the exterior body so that a sufficient amount of electrolyte can be supplied at one go.

[0022] In the second step, the electrolyte may be supplied to the internal space of the exterior body so that the electrode body is completely immersed in the electrolyte, or so that a portion of the electrode body is not immersed in the electrolyte. The method for sealing the opening after supplying the electrolyte is not particularly limited, and can be carried out by a known method.

[0023] (3rd step) In the third step, a portion of the exterior body to which the electrolyte has been supplied, which corresponds to the periphery of the electrode body, is compressed. By carrying out the third step, the electrolyte present around the electrode body (ie, not permeated into the electrode body) is moved toward the electrode body, promoting the permeation of the electrolyte into the electrode body.

[0024] The method for carrying out the third step is not particularly limited, and can be carried out, for example, by roll pressing, hand pressing, or the like. It is preferable that the pressure is applied so that the electrolyte present around the electrode body moves toward the electrode body. For example, the area to which pressure is applied may be moved in a direction from the edge of the electrode body toward the center (electrode body side). Simultaneously with or after the pressing, a portion of the exterior body that corresponds to the periphery of the electrode body may be folded towards one of the main surfaces of the battery. By folding the portion of the exterior body that surrounds the electrode assembly, it is possible to, for example, save the space required to house the battery in a case, and also to prevent electrolyte from leaking around the electrode assembly.

[0025] When the third step is carried out, pressure may be applied to the electrode body in the thickness direction. By applying pressure to the electrode body in the thickness direction, the electrolyte is prevented from flowing into the space between the electrode body and the outer casing, allowing the electrolyte to efficiently permeate the electrode body. From the viewpoint of efficiently permeating the electrolyte into the electrode body, it is preferable that the pressure applied to the electrode body is uniform in the surface direction of the electrode body. As a method for applying pressure uniformly in the surface direction of the electrode body, a method of applying pressure using a member having a flat surface in contact with the electrode body, such as a flat plate, can be mentioned.

[0026] When pressure is applied to the electrode body in the thickness direction, the pressure applied in the thickness direction of the electrode body may be constant. By keeping the pressure applied in the thickness direction of the electrode body constant, it is possible to prevent the outer casing from being destroyed by, for example, excessive pressure applied in the thickness direction of the electrode body due to electrolyte moving from the periphery of the electrode body toward the electrode body. As a method for making the pressure applied in the thickness direction of the electrode body constant, there is a method of applying pressure using a member that is movable in the thickness direction of the electrode body, such as a floating plate.

[0027] The shape of the battery produced by the method of the present disclosure is not particularly limited. A battery produced by the method of the present disclosure may, for example, satisfy the requirements for the battery of the present disclosure described below.

[0028] <Battery> The second embodiment of the present disclosure is a first exterior body, a second exterior body, and an electrode body disposed between the first exterior body and the second exterior body; The first and second exterior bodies each have a region X that is in contact with the electrode body and a region Y that is not in contact with the electrode body, Region Y is a battery made up of region Y1 where the first exterior body and the second exterior body are joined, and region Y2 where the first exterior body and the second exterior body are not joined.

[0029] The battery of the present disclosure will be described with reference to the drawings. 1 to 3 are plan and cross-sectional views that generally show a battery in which the first exterior body and the second exterior body are one continuous member. 4 to 6 are plan views and cross-sectional views that generally show a battery in which the first exterior body and the second exterior body are two separate members.

[0030] The battery 10 shown in FIGS. 1, 2, and 3 includes a first exterior body 20A, a second exterior body 20B, and an electrode body 30. The first exterior body 20A has a region X that is in contact with the electrode body 30, and a region Y that is not in contact with the electrode body 30. Region Y consists of a region Y1 where the first exterior body 10A and the second exterior body 20B are joined, and a region Y2 where the first exterior body 10A and the second exterior body 20B are not joined. The state of second exterior housing 20B in FIG. 1 is similar to that of first exterior housing 20A, and therefore a description thereof will be omitted. As shown in Fig. 2, the first exterior body 20A and the second exterior body 20B are one continuous member, and an area Y is provided on one side of the electrode body 30. The configuration shown in Fig. 2 is a state in which a recess for accommodating the electrode body 30 is formed in each of the first exterior body 20A and the second exterior body 20B (double cup embossing), but a state in which a recess for accommodating the electrode body 30 is formed in either one of the first exterior body 20A and the second exterior body 20B (single cup embossing) may also be used. FIG. 3 is a cross-sectional view showing a state in which a portion of first exterior body 20A and second exterior body 20B corresponding to region Y is folded toward one main surface of battery 10. As shown in FIG.

[0031] The first exterior body 20A and the second exterior body 20B used in the battery 10 each include an area X that is in contact with the electrode assembly 30 and an area Y that is not in contact with the electrode assembly 30. Furthermore, region Y is made up of region Y1 where first exterior housing 20A and second exterior housing 20B are joined, and region Y2 where first exterior housing 20A and second exterior housing 20B are not joined. That is, the volume of the internal space formed between first exterior body 20A and second exterior body 20B (corresponding to region X and region Y2) is larger than the volume of electrode assembly 30. Therefore, when supplying the electrolyte to the internal space of the exterior body, a sufficient amount of electrolyte to permeate the electrode body can be supplied in one operation. Furthermore, in the method disclosed herein, after the electrolyte solution is injected, the portions of the first exterior body 20A and the second exterior body 20B corresponding to the periphery of the electrode assembly 30 (corresponding to the region Y2) are compressed. This causes the electrolyte solution present around the electrode assembly 30 to move toward the electrode assembly 30, facilitating the permeation of the electrolyte solution into the electrode assembly 30.

[0032] The battery 10 shown in FIGS. 4, 5, and 6 includes a first exterior body 20A, a second exterior body 20B, and an electrode assembly 30. The first exterior body 20A has a region X that is in contact with the electrode body 30, and a region Y that is not in contact with the electrode body 30. Region Y consists of a region Y1 where the first exterior body 10A and the second exterior body 20B are joined, and a region Y2 where the first exterior body 10A and the second exterior body 20B are not joined. The state of second exterior housing 20B in FIG. 4 is similar to that of first exterior housing 20A, and therefore a description thereof will be omitted. As shown in Fig. 5, the first exterior body 20A and the second exterior body 20B are two separate members, and an area Y is provided on both sides of the electrode body 30. The configuration shown in Fig. 2 is a state in which a recess for accommodating the electrode body 30 is formed in each of the first exterior body 20A and the second exterior body 20B (double cup embossing), but a state in which a recess for accommodating the electrode body 30 is formed in either one of the first exterior body 20A and the second exterior body 20B (single cup embossing) may also be used. FIG. 6 is a cross-sectional view showing a state in which a portion of the first exterior body 20A and the second exterior body 20B corresponding to the periphery of the electrode assembly 30 (corresponding to region Y) is folded toward one main surface of the battery 10. As shown in FIG.

[0033] The first exterior body 20A and the second exterior body 20B used in the battery 10 each include an area X that is in contact with the electrode assembly 30 and an area Y that is not in contact with the electrode assembly 30. Furthermore, region Y is made up of region Y1 where first exterior housing 20A and second exterior housing 20B are joined, and region Y2 where first exterior housing 20A and second exterior housing 20B are not joined. That is, the volume of the internal space formed between first exterior body 20A and second exterior body 20B (corresponding to region X and region Y2) is larger than the volume of electrode assembly 30. Therefore, when supplying the electrolyte to the internal space of the exterior body, a sufficient amount of electrolyte to permeate the electrode body can be supplied in one operation. Furthermore, in the method disclosed herein, after the electrolyte solution is injected, the portions of the first exterior body 20A and the second exterior body 20B corresponding to the periphery of the electrode assembly 30 (corresponding to the region Y2) are compressed. This causes the electrolyte solution present around the electrode assembly 30 to move toward the electrode assembly 30, facilitating the permeation of the electrolyte solution into the electrode assembly 30.

[0034] Details and preferred aspects of the electrode assembly and exterior body in the battery of the present disclosure are the same as the details and preferred aspects of the electrode assembly and exterior body described in relation to the manufacturing method of the battery of the present disclosure.

[0035] From the viewpoint of improving the efficiency of the liquid injection operation, the area of ​​region Y2 in the first outer casing and the second outer casing is preferably 5% or more of the area of ​​region X in the first outer casing and the second outer casing, more preferably 10% or more, and even more preferably 15% or more.

[0036] From the standpoint of ensuring an appropriate joint between the first and second outer casings, the area of ​​region Y2 in the first and second outer casings is preferably 35% or less of the area of ​​region X in the first and second outer casings, more preferably 30% or less, and even more preferably 25% or less.

[0037] From the viewpoint of improving the efficiency of the injection operation, the area of ​​region Y2 in the first outer casing and the second outer casing is preferably 5% or more of the area of ​​region Y1 in the first outer casing and the second outer casing, more preferably 10% or more, and even more preferably 15% or more.

[0038] From the standpoint of properly ensuring the joining portion of the first outer casing and the second outer casing, the area of ​​region Y2 in the first outer casing and the second outer casing is preferably 95% or less of the area of ​​region Y1 in the first outer casing and the second outer casing, more preferably 90% or less, and even more preferably 85% or less.

[0039] The battery of the present disclosure may be installed in an electric vehicle. An example in which the battery of the present disclosure is applied to an electric vehicle will be described below with reference to the drawings. In the following description, "battery cell 20" corresponds to the battery of the present disclosure.

[0040] Fig. 7 is a schematic plan view showing a main part of a vehicle 100 to which a battery pack 10 according to an embodiment is applied. As shown in Fig. 7, the vehicle 100 is an electric vehicle (BEV: Battery Electric Vehicle) in which the battery pack 10 is mounted under the floor. Note that the arrows UP, FR, and LH in each figure indicate the upper side in the vehicle vertical direction, the front side in the vehicle front-rear direction, and the left side in the vehicle width direction, respectively. When describing using the front-rear, left-right, up-down directions, they refer to the front-rear in the vehicle front-rear direction, the left-right in the vehicle width direction, and the up-down in the vehicle vertical direction, unless otherwise specified.

[0041] As an example, in the vehicle 100 of this embodiment, a DC / DC converter 102, an electric compressor 104, and a PTC (Positive Temperature Coefficient) heater 106 are disposed on the vehicle front side of the battery pack 10. In addition, a motor 108, a gear box 110, an inverter 112, and a charger 114 are disposed on the vehicle rear side of the battery pack 10.

[0042] The direct current output from the battery pack 10 has its voltage adjusted by a DC / DC converter 102, and is then supplied to an electric compressor 104, a PTC heater 106, an inverter 112, etc. In addition, power is supplied to a motor 108 via the inverter 112, causing the rear wheels to rotate and causing the vehicle 100 to run.

[0043] A charging port 116 is provided on the right side at the rear of the vehicle 100, and by connecting a charging plug of an external charging device (not shown) to the charging port 116, power can be stored in the battery pack 10 via the on-board charger 114.

[0044] The arrangement and structure of each component constituting the vehicle 100 are not limited to the above-mentioned configuration. For example, the present invention may be applied to a hybrid vehicle (HV: Hybrid Vehicle) equipped with an engine or a plug-in hybrid vehicle (PHEV: Plug-in Hybrid Electric Vehicle). In addition, in the present embodiment, the vehicle is a rear-wheel drive vehicle in which the motor 108 is mounted at the rear of the vehicle, but the present invention is not limited to this. The vehicle may be a front-wheel drive vehicle in which the motor 108 is mounted at the front of the vehicle, or a pair of motors 108 may be mounted at the front and rear of the vehicle. Furthermore, the vehicle may be equipped with an in-wheel motor on each wheel.

[0045] The battery pack 10 includes a plurality of battery modules 11. In the present embodiment, as an example, ten battery modules 11 are provided. Specifically, five battery modules 11 are arranged on the right side of the vehicle 100 in the vehicle longitudinal direction, and five battery modules 11 are arranged on the left side of the vehicle 100 in the vehicle longitudinal direction. In addition, the respective battery modules 11 are electrically connected to each other.

[0046] Fig. 8 is a schematic perspective view of the battery module 11. As shown in Fig. 8, the battery module 11 is formed in a substantially rectangular parallelepiped shape with the vehicle width direction as the longitudinal direction. The outer shell of the battery module 11 is formed of an aluminum alloy. For example, the outer shell of the battery module 11 is formed by joining aluminum die castings to both ends of an aluminum alloy extrusion material by laser welding or the like.

[0047] A pair of voltage terminals 12 and a connector 14 are provided at both ends of the battery module 11 in the vehicle width direction. A flexible printed circuit board 21, which will be described later, is connected to the connector 14. In addition, bus bars (not shown) are welded to both ends of the battery module 11 in the vehicle width direction.

[0048] The length MW of the battery module 11 in the vehicle width direction is, for example, 350 mm to 600 mm, the length ML in the vehicle front-rear direction is, for example, 150 mm to 250 mm, and the height MH in the vehicle up-down direction is, for example, 80 mm to 110 mm.

[0049] Fig. 9 is a plan view of the battery module 11 with the top cover removed. As shown in Fig. 9, a plurality of battery cells 20 are housed in an arranged state inside the battery module 11. In this embodiment, as an example, 24 battery cells 20 are arranged in the front-rear direction of the vehicle and bonded to one another.

[0050] A flexible printed circuit (FPC) 21 is disposed on the battery cells 20. The flexible printed circuit 21 is formed in a strip shape with the vehicle width direction as the longitudinal direction, and a thermistor 23 is provided on each of both ends of the flexible printed circuit 21. The thermistor 23 is not bonded to the battery cells 20, and is configured to be pressed towards the battery cells 20 by the upper lid of the battery module 11.

[0051] One or more cushioning materials (not shown) are housed inside the battery module 11. For example, the cushioning materials are elastically deformable thin plate-like members, and are arranged between adjacent battery cells 20 with the arrangement direction of the battery cells 20 being the thickness direction. As an example in this embodiment, cushioning materials are arranged at both ends of the battery module 11 in the longitudinal direction and in the central portion in the longitudinal direction.

[0052] Fig. 10 is a schematic diagram of a battery cell 20 housed in a battery module 11, viewed from the thickness direction. As shown in Fig. 10, the battery cell 20 is formed in a substantially rectangular plate shape, and houses an electrode body (not shown) inside. The electrode body is configured by laminating a positive electrode, a negative electrode, and a separator, and is sealed with a laminate film 22.

[0053] In this embodiment, as an example, the housing portion for the electrode body is formed by folding and pasting an embossed sheet-like laminate film 22. Note that, although both a single cup embossed structure in which embossing is performed at one place and a double cup embossed structure in which embossing is performed at two places can be adopted, the present embodiment adopts a single cup embossed structure with a drawing depth of about 8 mm to 10 mm.

[0054] The upper ends of the battery cells 20 at both ends in the longitudinal direction are bent to form corners. The upper end of the battery cells 20 is also bent, and a fixing tape 24 is wound around the upper end of the battery cells 20 along the longitudinal direction.

[0055] Here, terminals (tabs) 26 are provided at both longitudinal ends of the battery cell 20. In this embodiment, as an example, the terminals 26 are provided at positions offset downward from the vertical center of the battery cell 20. The terminals 26 are joined to a bus bar (not shown) by laser welding or the like.

[0056] The length CW1 of the battery cell 20 in the vehicle width direction is, for example, 530 mm to 600 mm, 600 mm to 700 mm, 700 mm to 800 mm, 800 to 900 mm, 1000 mm or more, the length CW2 of the region in which the electrode body is housed is, for example, 500 mm to 520 mm, 600 mm to 700 mm, 700 mm to 800 mm, 800 to 900 mm, 1000 mm or more, and the height CH of the battery cell 20 is, for example, 80 mm to 110 mm, 110 mm to 140 mm. The thickness of the battery cell 20 is 5.0 mm to 7.0 mm, 7.0 mm to 9.0 mm, 9.0 mm to 11.0 mm, and the height TH of the terminal 26 is 40 mm to 50 mm, 50 mm to 60 mm, 60 mm to 70 mm. [Explanation of symbols]

[0057] 10: battery, 20A: first exterior body, 20B: second exterior body, 30: electrode body

Claims

1. A first step of disposing an electrode assembly in an internal space of an exterior body; A second step of supplying an electrolyte solution into an internal space of the exterior body in which the electrode body is disposed; and a third step of compressing a portion of the exterior body to which the electrolytic solution has been supplied, the portion corresponding to the periphery of the electrode body, A method for manufacturing a battery, wherein the volume of the internal space of the exterior body is larger than the volume of the electrode body.

2. The method for manufacturing a battery according to claim 1 , wherein the pressure is applied so that the electrolyte present around the electrode body moves toward the electrode body.

3. The method for producing a battery according to claim 1 , further comprising a step of folding a portion of the exterior body corresponding to a periphery of the electrode body toward one of the main surfaces of the battery simultaneously with or after the pressing.

4. a first exterior body, a second exterior body, and an electrode body disposed between the first exterior body and the second exterior body; The first exterior body and the second exterior body each have a region X that is in contact with the electrode body and a region Y that is not in contact with the electrode body, The battery, wherein region Y is composed of region Y1 where the first exterior body and the second exterior body are joined, and region Y2 where the first exterior body and the second exterior body are not joined.

5. 5. The battery according to claim 4, wherein the area of ​​region Y2 is 5% or more of the area of ​​region X.

6. 5. The battery according to claim 4, wherein the area of ​​region Y2 is 5% or more of the area of ​​region Y1.

7. The battery according to claim 4 , wherein region Y of the first exterior body and the second exterior body is folded toward one of the main surfaces of the battery.

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