Battery manufacturing method and battery
By using an outer casing with a larger volume than the electrode body and applying pressure to promote electrolyte penetration, the method addresses the inefficiencies in existing battery manufacturing processes, enhancing electrolyte distribution in lithium-ion secondary batteries.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- TOYOTA JIDOSHA KK
- Filing Date
- 2023-10-10
- Publication Date
- 2026-06-09
AI Technical Summary
Existing methods for manufacturing lithium-ion secondary batteries face challenges in efficiently penetrating the electrolytic solution into the electrode body due to the need for adhesive-free areas between electrodes and separators, which complicates the manufacturing process.
A method involving an outer casing with a larger internal volume than the electrode body, where the electrolyte solution is supplied and then compressed to move around the electrode, promoting penetration into the electrode body.
This method allows for efficient electrolyte penetration into the electrode body in a single operation, improving manufacturing efficiency without additional processing steps.
Smart Images
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Abstract
Description
Technical Field
[0001] The present disclosure relates to a method for manufacturing a battery and a battery.
Background Art
[0002] A lithium-ion secondary battery is generally manufactured by injecting an electrolytic solution into an exterior body that houses an electrode body including electrodes and a separator. The electrode body is pressed at a high pressure to increase the electrode density, or the electrodes and the separator are joined with an adhesive or the like. Therefore, it is difficult for the electrolytic solution to penetrate into the electrode body, and improving the efficiency of the liquid injection operation has become an issue.
[0003] As a method for improving the permeability of the electrolytic solution to the electrode body, for example, Patent Document 1 proposes providing a portion where the electrodes and the separator constituting the electrode body are not adhered when adhering the electrodes and the separator.
Prior Art Documents
Patent Documents
[0004]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0005] The method described in Patent Document 1 requires a step of providing a portion where the electrodes and the separator are not adhered in order to increase the permeability of the electrolytic solution, so there is room for improvement in work efficiency. An embodiment of the present disclosure aims to provide a method for manufacturing a battery and a battery that can cause an electrolytic solution to penetrate into an electrode body by a simple method.
Means for Solving the Problems
[0006] Means for solving the above problems include the following embodiments. <1>A first step of disposing an electrode body in an internal space of an exterior body; A second step involves supplying an electrolyte solution to the internal space of the outer casing in which the electrodes are arranged, The process includes a third step of applying pressure to the area of the outer casing supplied with electrolyte, corresponding to the area around the electrode body, A battery manufacturing method in which the internal volume of the outer casing is larger than the volume of the electrode body. <2> The aforementioned compression is performed so that the electrolyte present around the electrode body moves towards the electrode body. <1> The battery manufacturing method described above. <3> Simultaneously with or after the compression, the process includes bending the portion of the outer casing corresponding to the area around the electrode body toward one of the main surfaces of the battery. <1> or <2> The battery manufacturing method described above. <4> It includes a first outer casing, a second outer casing, and an electrode body disposed between the first and second outer casings. The first outer casing and the second outer casing 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 consisting of region Y1 where the first outer casing and the second outer casing are joined, and region Y2 where the first outer casing and the second outer casing are not joined. <5> The area of region Y2 is 5% or more of the area of region X. <4> The battery listed. <6> The area of region Y2 is 5% or more of the area of region Y1. <4> or <5> The battery listed. <7> Regions Y of the first and second outer casings are folded toward the main surface side of either the battery. <4> ~ <6> A battery as described in any one of the items. [Effects of the Invention]
[0007] According to one embodiment of the present disclosure, a method for manufacturing a battery and a battery are provided that allows an electrolyte to be permeated into an electrode body by a simple method. [Brief explanation of the drawing]
[0008] [Figure 1] This is a schematic plan view illustrating an example of a battery configuration. [Figure 2] This is a schematic cross-sectional view showing an example of a battery configuration. [Figure 3]This is a schematic cross-sectional view showing an example of a battery configuration. [Figure 4] This is a schematic plan view illustrating an example of a battery configuration. [Figure 5] This is a schematic cross-sectional view showing an example of a battery configuration. [Figure 6] This is a schematic cross-sectional view showing an example of a battery configuration. [Figure 7] This diagram schematically illustrates an example of the application of batteries to electric vehicles. [Figure 8] This diagram schematically shows an example of a battery module configuration. [Figure 9] This diagram schematically shows an example of a battery module configuration. [Figure 10] This diagram schematically shows an example of the configuration of a battery cell included in a battery module. [Modes for carrying out the invention]
[0009] In this disclosure, a numerical range indicated using "~" means a range that includes the numbers written before and after "~" as the minimum and maximum values, respectively. In the numerical ranges described in stages in this disclosure, the upper or lower limit stated in one numerical range may be replaced with the upper or lower limit of another numerical range described in stages. In the numerical ranges described in this disclosure, the upper or lower limit stated in one numerical range may be replaced with the values shown in the examples. In this disclosure, the term "process" includes not only independent processes but also processes that cannot be clearly distinguished from other processes, as long as their intended purpose is achieved. When embodiments are described in this disclosure with reference to the drawings, the configuration of such embodiments is not limited to the configuration shown in the drawings. Furthermore, the sizes of the components in each figure are conceptual, and the relative relationships between the components are not limited thereto.
[0010] <Battery manufacturing method> The first embodiment of this disclosure is A first step of disposing an electrode body in an internal space of an exterior body; A second step of supplying an electrolytic solution to the internal space of the exterior body in which the electrode body is disposed; A third step of pressing a portion corresponding to the periphery of the electrode body of the exterior body to which the electrolytic solution has been supplied, and includes: 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.
[0011] In a conventional method for manufacturing a battery, the volume of the internal space of an exterior body for accommodating an electrode body is substantially equal to the volume of the electrode body. Also, it takes a certain amount of time for the electrolytic solution to penetrate the electrode body. Therefore, it is difficult to supply the amount of electrolytic solution that finally penetrates the electrode body to the internal space of the exterior body in a single liquid injection operation. For this reason, in the conventional method, a first liquid injection operation is performed to supply an amount of electrolytic solution that does not exceed the volume of the internal space of the exterior body, and waiting is done until the electrolytic solution penetrates the electrode body. Thereafter, a second liquid injection operation is performed to allow a sufficient amount of electrolytic solution to penetrate the electrode body.
[0012] In the method of the present disclosure, an exterior body in which the volume of the internal space is larger than the volume of the electrode body is used. Therefore, the amount of electrolytic solution that finally penetrates the electrode body can be injected in a single liquid injection operation.
[0013] In the method of the present disclosure, the volume of the internal space of the exterior body used for manufacturing the battery is larger than the volume of the electrode body. Therefore, at the end of the liquid injection operation of the electrolytic solution, the electrolytic solution that has not yet penetrated the electrode body exists around the electrode body. Therefore, after the liquid injection operation, the portion corresponding to the periphery of the electrode body of the exterior body is pressed. Thereby, the electrolytic solution existing around the electrode body is moved to the electrode body side to promote the penetration of the electrolytic solution.
[0014] According to the method of the present disclosure, for example, the efficiency of the liquid injection operation can be improved without performing processing on the electrode body to enhance the permeability of the electrolytic solution. Hereinafter, each step included in the method of the present disclosure will be described.
[0015] (First step) In the first step, the electrode body is placed in the internal space of an outer casing having an internal space with a volume larger than the volume of the electrode body. The type of outer casing is not particularly limited as long as it can accommodate the electrode body. From the viewpoint of compressing the part of the outer casing corresponding to the electrode body to which the electrolyte is supplied, it is preferable that the outer casing be a thin, flexible sheet-like material.
[0016] The exterior may consist of one component or two or more components. For example, if the exterior is a sheet, it may consist of one sheet or two sheets.
[0017] As the outer casing, a laminate (so-called laminate film) having a metal layer containing a metal such as aluminum and a heat-seal layer may be used. In other words, a battery manufactured by the method of this disclosure may be a battery that uses a laminate film as the outer casing (so-called laminate battery).
[0018] When using laminate film as the outer casing, methods for performing the first step include, for example, a method in which the electrode body is placed between two laminate films 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 edges of one laminate film folded in half or two overlapping laminate films are joined by heat sealing, and the electrode body is placed in the space surrounded by the joined portion of the laminate film. If necessary, the laminate film may have recessed portions for accommodating the electrode bodies.
[0019] There are no particular restrictions on the type of electrode material; it can be selected according to the size and application of the battery. As an electrode body, for example, a laminate in which electrodes (negative and positive electrodes) and separators placed between the electrodes are stacked can be used. The number of electrodes and separators included in the electrode body is not particularly limited and can be selected according to the size and application of the battery. As electrodes, for example, a current collector can be used in which a layer containing electrode active material is formed on one or both sides. For example, a microporous film made of a resin such as polyethylene can be used as a separator.
[0020] (2nd process) In the second step, an electrolyte solution is supplied to the internal space of the outer casing in which the electrodes are placed. The method for supplying the electrolyte to the internal space of the outer casing is not particularly limited and can be carried out using known methods. The second step may be carried out, for example, with the outer casing positioned such that the opening of the outer casing containing the electrode body (the electrolyte inlet) is on the upper side when viewed in the direction of gravity. From the viewpoint of improving the permeability of the electrolyte to the electrode body, the internal space of the outer casing may be depressurized before supplying the electrolyte.
[0021] In the second step, the electrolyte solution may be supplied to the internal space of the outer casing in one go or in multiple steps. From the viewpoint of improving the efficiency of the electrolyte injection process, it is preferable to supply the electrolyte solution to the internal space of the outer casing in one go. That is, it is preferable to design the volume of the internal space of the outer casing so that a sufficient amount of electrolyte solution can be supplied in one go.
[0022] In the second step, the supply of electrolyte to the internal space of the outer casing may be carried out so that the electrode body is completely immersed in the electrolyte, or so that a part 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 known methods.
[0023] (3rd step) In the third step, the area of the outer casing containing the electrolyte that corresponds to the area around the electrode is compressed. The third step involves moving the electrolyte that is present around the electrode (i.e., has not penetrated the electrode) towards the electrode, thereby promoting the penetration of the electrolyte into the electrode.
[0024] There are no particular restrictions on the method used to carry out the third step. For example, it can be carried out using a roll press, a hand press, or the like. It is preferable to apply pressure in such a way that the electrolyte surrounding the electrode body moves towards the electrode body. For example, the area where pressure is applied may be moved from the edge of the electrode body toward the center (towards the electrode body). Simultaneously with or after compression, the portion of the outer casing corresponding to the area around the electrode body may be bent toward the main surface of either side of the battery. By folding the portion of the outer casing that corresponds to the area around the electrode body, space can be saved, for example, when housing the battery in a case. Furthermore, it prevents electrolyte leakage around the electrode body.
[0025] When performing the third step, pressure may be applied to the electrode body in the thickness direction. By applying pressure to the electrode body in the thickness direction, the inflow of electrolyte into the space between the electrode body and the outer casing is suppressed, allowing the electrolyte to penetrate the electrode body efficiently. From the viewpoint of efficiently permeating the electrode body with electrolyte, it is preferable that the pressure applied to the electrode body be uniform in the planar direction of the electrode body. One method for applying uniform pressure in the planar direction of the electrode body is to use a member with a flat surface in contact with the electrode body, such as a flat plate, to apply pressure.
[0026] When applying pressure to an electrode in the thickness direction, the pressure applied to the electrode in the thickness direction may be kept constant. By keeping the pressure applied in the thickness direction of the electrode constant, it is possible to prevent the outer casing from being damaged due to excessive pressure applied in the thickness direction of the electrode by the electrolyte that has moved from the periphery of the electrode towards the electrode. One method for maintaining a constant pressure applied in the thickness direction of the electrode body is to use a movable member, such as a floating plate, to apply pressure in the thickness direction of the electrode body.
[0027] The form of the battery manufactured by the method of this disclosure is not particularly limited. A battery manufactured by the method of this disclosure may, for example, satisfy the requirements for the battery of this disclosure described later.
[0028] <Battery> A second embodiment of this disclosure is It includes a first outer casing, a second outer casing, and an electrode body disposed between the first and second outer casings. The first outer casing and the second outer casing 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 consisting of region Y1 where the first outer casing and the second outer casing are joined, and region Y2 where the first outer casing and the second outer casing are not joined.
[0029] The battery described herein will be explained with reference to the drawings. Figures 1 to 3 are schematic plan views and cross-sectional views of a battery where the first and second outer casings are a single continuous component. Figures 4 to 6 are schematic plan views and cross-sectional views of a battery in which the first and second outer casings are two separate components.
[0030] The battery 10 shown in Figures 1, 2, and 3 comprises a first outer casing 20A and a second outer casing 20B, and an electrode body 30. The first outer casing 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 outer casing 10A and the second outer casing 20B are joined, and a region Y2 where the first outer casing 10A and the second outer casing 20B are not joined. The state of the second outer casing 20B in Figure 1 is the same as that of the first outer casing 20A, so the explanation is omitted. As shown in Figure 2, the first outer casing 20A and the second outer casing 20B are a single continuous member, and a region Y is provided on one side of the electrode body 30. The configuration shown in Figure 2 is a state in which recesses for accommodating the electrode body 30 are formed in each of the first outer casing 20A and the second outer casing 20B (double cup embossing), but it may also be a state in which the recess for accommodating the electrode body 30 is formed in either the first outer casing 20A or the second outer casing 20B (single cup embossing). Figure 3 is a cross-sectional view showing the parts of the first outer casing 20A and the second outer casing 20B corresponding to region Y, folded towards one of the main surfaces of the battery 10.
[0031] The first casing 20A and the second casing 20B used in the battery 10 each consist of 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. Furthermore, region Y consists of region Y1 where the first exterior body 20A and the second exterior body 20B are joined, and region Y2 where the first exterior body 20A and the second exterior body 20B are not joined. In other words, the volume of the internal space formed between the first outer casing 20A and the second outer casing 20B (corresponding to regions X and Y2) is larger than the volume of the electrode body 30. Therefore, when supplying electrolyte to the internal space of the outer casing, a sufficient amount of electrolyte to permeate the electrode body can be supplied in a single operation. Furthermore, in the method of this disclosure, after injecting the electrolyte, the parts of the first outer casing 20A and the second outer casing 20B corresponding to the area around the electrode body 30 (corresponding to region Y2) are compressed. This moves the electrolyte present around the electrode body 30 towards the electrode body 30, thereby promoting the penetration of the electrolyte into the electrode body 30.
[0032] The battery 10 shown in Figures 4, 5, and 6 comprises a first casing 20A and a second casing 20B, and an electrode body 30. The first outer casing 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 outer casing 10A and the second outer casing 20B are joined, and a region Y2 where the first outer casing 10A and the second outer casing 20B are not joined. The state of the second outer casing 20B in Figure 4 is the same as that of the first outer casing 20A, so its explanation is omitted. As shown in Figure 5, the first outer casing 20A and the second outer casing 20B are two separate components, and regions Y are provided on both sides of the electrode body 30. The configuration shown in Figure 2 is a state in which recesses for accommodating the electrode body 30 are formed in each of the first outer casing 20A and the second outer casing 20B (double cup embossing), but it may also be a state in which recesses for accommodating the electrode body 30 are formed in either the first outer casing 20A or the second outer casing 20B (single cup embossing). Figure 6 is a cross-sectional view showing the state in which the portions of the first outer casing 20A and the second outer casing 20B corresponding to the area around the electrode body 30 (corresponding to region Y) are folded toward one main surface side of the battery 10.
[0033] The first casing 20A and the second casing 20B used in the battery 10 each consist of 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. Furthermore, region Y consists of region Y1 where the first exterior body 20A and the second exterior body 20B are joined, and region Y2 where the first exterior body 20A and the second exterior body 20B are not joined. In other words, the volume of the internal space formed between the first outer casing 20A and the second outer casing 20B (corresponding to regions X and Y2) is larger than the volume of the electrode body 30. Therefore, when supplying electrolyte to the internal space of the outer casing, a sufficient amount of electrolyte to permeate the electrode body can be supplied in a single operation. Furthermore, in the method of this disclosure, after injecting the electrolyte, the parts of the first outer casing 20A and the second outer casing 20B corresponding to the area around the electrode body 30 (corresponding to region Y2) are compressed. This moves the electrolyte present around the electrode body 30 towards the electrode body 30, thereby promoting the penetration of the electrolyte into the electrode body 30.
[0034] Details and preferred embodiments of the electrode body and casing in the battery of this disclosure are the same as the details and preferred embodiments of the electrode body and casing described in relation to the manufacturing method of the battery of this disclosure.
[0035] From the viewpoint of improving the efficiency of the liquid injection work, the area of region Y2 in the first and second outer casings is preferably 5% or more, more preferably 10% or more, and even more preferably 15% or more of the area of region X in the first and second outer casings.
[0036] From the viewpoint of appropriately securing the joint portion between the first exterior and the second exterior, the area of region Y2 in the first exterior and the second exterior is preferably 35% or less, more preferably 30% or less, and even more preferably 25% or less, of the area of region X in the first exterior and the second exterior.
[0037] From the viewpoint of improving the efficiency of the liquid injection work, the area of region Y2 in the first and second outer casings is preferably 5% or more, more preferably 10% or more, and even more preferably 15% or more of the area of region Y1 in the first and second outer casings.
[0038] From the viewpoint of appropriately securing the joint portion between the first exterior and the second exterior, the area of region Y2 in the first exterior and the second exterior is preferably 95% or less, more preferably 90% or less, and even more preferably 85% or less, of the area of region Y1 in the first exterior and the second exterior.
[0039] The battery of this disclosure may be installed in an electric vehicle. An example of applying the battery of this disclosure 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 this disclosure.
[0040] Figure 7 is a schematic plan view showing the main parts of a vehicle 100 to which the battery pack 10 according to the embodiment is applied. As shown in Figure 7, the vehicle 100 is a battery electric vehicle (BEV) with the battery pack 10 mounted under the floor. In each figure, the arrows UP, FR, and LH indicate the upper side in the vertical direction of the vehicle, the front side in the longitudinal direction of the vehicle, and the left side in the width direction of the vehicle, respectively. When describing the directions of front, rear, left, right, up, and down, unless otherwise specified, they refer to the front and rear in the longitudinal direction of the vehicle, the left and right in the width direction of the vehicle, and the up and down in the vertical direction of the vehicle.
[0041] In this embodiment, the vehicle 100, as an example, has a DC / DC converter 102, an electric compressor 104, and a PTC (Positive Temperature Coefficient) heater 106 positioned in front of the battery pack 10. The motor 108, gearbox 110, inverter 112, and charger 114 are positioned behind the battery pack 10.
[0042] The DC current output from the battery pack 10 is voltage-adjusted by the DC / DC converter 102 and then supplied to the electric compressor 104, PTC heater 106, inverter 112, etc. Power is also supplied to the motor 108 via the inverter 112, causing the rear wheels to rotate and the vehicle 100 to move.
[0043] A charging port 116 is provided on the right side of the rear of the vehicle 100. By connecting a charging plug from an external charging device (not shown) to the charging port 116, power can be stored in the battery pack 10 via the onboard charger 114.
[0044] The arrangement and structure of the components constituting the vehicle 100 are not limited to the configuration described above. For example, it may be applied to a hybrid vehicle (HV) or a plug-in hybrid electric vehicle (PHEV) equipped with an engine. In this embodiment, the motor 108 is mounted at the rear of the vehicle and it is a rear-wheel drive vehicle, but it is not limited to this, and it may be a front-wheel drive vehicle with the motor 108 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, it may be a vehicle equipped with in-wheel motors for each wheel.
[0045] The battery pack 10 is composed of multiple battery modules 11. In this embodiment, as an example, 10 battery modules 11 are provided. Specifically, 5 battery modules 11 are arranged in the longitudinal direction of the vehicle on the right side of the vehicle 100, and 5 battery modules 11 are arranged in the longitudinal direction of the vehicle on the left side of the vehicle 100. Furthermore, each battery module 11 is electrically connected.
[0046] Figure 8 is a schematic perspective view of the battery module 11. As shown in Figure 8, the battery module 11 is formed in a roughly rectangular parallelepiped shape with the vehicle width direction as its longitudinal direction. The outer shell of the battery module 11 is made of aluminum alloy. For example, the outer shell of the battery module 11 is formed by joining aluminum die-cast parts to both ends of an aluminum alloy extruded 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, busbars (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 longitudinal direction is, for example, 150 mm to 250 mm, and the height MH in the vehicle vertical direction is, for example, 80 mm to 110 mm.
[0049] Figure 9 is a plan view of the battery module 11 with the top cover removed. As shown in Figure 9, multiple battery cells 20 are housed inside the battery module 11 in an arranged state. In this embodiment, as an example, 24 battery cells 20 are arranged in the front-rear direction of the vehicle and bonded to each other.
[0050] A flexible printed circuit board (FPC) 21 is placed on top of the battery cell 20. The flexible printed circuit board 21 is formed in a strip shape with the vehicle width direction as its longitudinal direction, and thermistors 23 are provided at both ends of the flexible printed circuit board 21. The thermistors 23 are not bonded to the battery cell 20, but are pressed toward the battery cell 20 by the upper cover of the battery module 11.
[0051] Furthermore, one or more cushioning materials (not shown) are housed inside the battery module 11. For example, the cushioning material is a thin, elastically deformable plate-like member, and is arranged between adjacent battery cells 20 with the arrangement direction of the battery cells 20 as the thickness direction. In this embodiment, as an example, cushioning material is arranged at both ends in the longitudinal direction and in the longitudinal center of the battery module 11.
[0052] Figure 10 is a schematic view of a battery cell 20 housed in a battery module 11, viewed from the thickness direction. As shown in Figure 10, the battery cell 20 is formed in a roughly rectangular plate shape, and an electrode body (not shown) is housed inside. The electrode body is composed of a positive electrode, a negative electrode, and a separator stacked together, and is sealed with a laminate film 22.
[0053] In this embodiment, as an example, the electrode housing is formed by folding and bonding an embossed sheet-like laminate film 22. While both a single-cup embossed structure (with one embossed area) and a double-cup embossed structure (with two embossed areas) can be employed, this embodiment uses a single-cup embossed structure with a fold depth of approximately 8mm to 10mm.
[0054] The upper ends of both longitudinal ends of the battery cell 20 are bent, and the corners form the outer shape. In addition, the upper end of the battery cell 20 is bent, and a fixing tape 24 is wrapped around the upper end of the battery cell 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 a position offset below the vertical center of the battery cell 20. The terminals 26 are joined to a busbar (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, 530mm~600mm, 600mm~700mm, 700mm~800mm, 800~900mm, and 1000mm or more. The length CW2 of the area where the electrode body is housed is, for example, 500mm~520mm, 600mm~700mm, 700mm~800mm, 800~900mm, and 1000mm or more. The height CH of the battery cell 20 is, for example, 80mm~110mm and 110mm~140mm. The thickness of the battery cell 20 is 5.0mm~7.0mm, 7.0mm~9.0mm, and 9.0mm~11.0mm. The height TH of the terminal 26 is 40mm~50mm, 50mm~60mm, and 60mm~70mm. [Explanation of symbols]
[0057] 10: Battery, 20A: First casing, 20B: Second casing, 30: Electrode
Claims
1. The first step involves arranging the electrode body in the internal space of the outer casing, A second step involves supplying an electrolyte solution to the internal space of the outer casing containing the electrodes, in which the electrodes are arranged. The process includes a third step of applying pressure to the area of the outer casing supplied with electrolyte, corresponding to the area around the electrode body, The third step is carried out after the second step. A battery manufacturing method in which the internal volume of the outer casing is larger than the volume of the electrode body.
2. The method for manufacturing a battery according to claim 1, wherein the compression is performed so that the electrolyte present around the electrode body moves toward the electrode body.
3. A method for manufacturing a battery according to claim 1, comprising the step of bending a portion of the outer casing corresponding to the area around the electrode body toward one of the main surfaces of the battery, simultaneously with or after the compression.
4. The method for manufacturing a battery according to claim 1, wherein the supply of electrolyte in the second step is carried out in such a way that a part of the electrode body is not immersed in the electrolyte.
5. The method for manufacturing a battery according to claim 1, wherein the supply of electrolyte in the second step is carried out so that the electrode body is completely immersed in the electrolyte.