Battery manufacturing method

Abstract

To improve the ease of battery assembly. [Solution] The second assembly 2-2 is stacked on the upper plate 13b of the first assembly 2-1, which is in a compressed state with the laminate 12 of the cell 10 and cushioning material 11. The first pressing member 20 that holds down the upper plate 13b is housed in a receiving recess 14 provided on the upper surface of the upper plate 13b, and the upper surface of the upper plate 13b protrudes above the first pressing member 20. With the first assembly 2-1 and the second assembly 2-2 under pressure in the stacking direction, the first pressing member 20 is removed along a first direction intersecting the stacking direction.

Description

Technical Field

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

Background Art

[0002] In recent years, in order to enable more people to access affordable, reliable, sustainable, and advanced energy, research and development have been conducted on secondary batteries that contribute to energy efficiency.

[0003] The battery module described in Patent Document 1 includes a pair of end plates that sandwich a battery laminate in which a plurality of unit cells are stacked in the stacking direction of the cells, and a restraint band that restrains the pair of end plates so as to press the battery laminate. The pair of end plates has a concave restraint band fixing portion for fixing the restraint band and a concave claw-hanging portion for engaging a jig for pulling the end plates in a direction to temporarily widen the distance between the pair of end plates.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] For example, in a battery mounted on an electric vehicle such as an electric car, in response to the demand for increasing the capacity and / or voltage of the battery, the number of stacked cells tends to increase. As the number of cells increases, when compressing the stacked cells and the cushioning material sandwiching the cells, the cells and cushioning material in the middle part in the stacking direction are likely to be displaced in a direction perpendicular to the stacking direction.

[0006] One object of the present invention is to improve the assembly property of the battery.

Means for Solving the Problems

[0007] A method for manufacturing a battery according to one aspect of the present invention is a method for manufacturing a battery in which a plurality of cushioning materials and a plurality of cells arranged between two adjacent cushioning materials are stacked, A first assembly comprising a first laminate containing one or more of the cells and two or more of the cushioning material, and a pair of first plates compressibly sandwiching the first laminate in the stacking direction, A second assembly comprising a second laminate containing one or more of the cells and two or more of the cushioning material, and a pair of second plates compressibly sandwiching the second laminate in the stacking direction, Equipped with, The first laminate of the first assembly is compressed, with one first plate being supported and the other first plate being held down by a first pressing member. The second plate is placed on top of the other first plate, and the second assembly is stacked on top of the first assembly. The first retaining member is housed in a receiving recess provided on the surface of the other first plate facing outward in the stacking direction, and the surface of the other first plate protrudes outward in the stacking direction more than the first retaining member. The first assembly and the second assembly are pressed in the stacking direction, and while under pressure, the first retaining member is removed along a first direction intersecting the stacking direction. [Effects of the Invention]

[0008] According to the present invention, the ease of assembling batteries can be improved. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic front view illustrating an example of a battery for illustrating an embodiment of the present invention. [Figure 2] Figure 1 is a perspective view of an example of a retaining member used in the manufacture of a battery. [Figure 3]Figure 2 is a front view of the retaining member. [Figure 4] Figure 2 is a cross-sectional view of the retaining member. [Figure 5] This diagram shows the manufacturing process of the battery in Figure 1, step by step. [Figure 6] This diagram shows the manufacturing process of the battery in Figure 1, step by step. [Figure 7] This diagram shows the manufacturing process of the battery in Figure 1, step by step. [Figure 8] Figure 2 is a perspective view of a modified example of the retaining member. [Figure 9] This figure shows another example of the battery manufacturing method shown in Figure 1. [Figure 10] This figure shows, step by step, the manufacturing method of a modified version of the battery shown in Figure 1. [Figure 11] This figure shows, step by step, the manufacturing method of a modified version of the battery shown in Figure 1. [Modes for carrying out the invention]

[0010] An example of a battery and a method for manufacturing the same, for illustrating embodiments of the present invention, will be described with reference to the attached drawings.

[0011] The battery 1 shown in Figure 1 comprises a plurality of cells 10 and a plurality of cushioning materials 11. The cells 10 and cushioning materials 11 are flat or planar and are stacked in the thickness direction. A cell 10 is sandwiched between two adjacent cushioning materials 11.

[0012] Multiple cells 10 and multiple cushioning materials 11 are divided into multiple sets, each set having one or more cells 10 and two or more cushioning materials 11, and further having a set of plates 13 that compress the laminate 12 of cells 10 and cushioning materials 11 in the stacking direction. One assembly is formed by one set of plates 13 and the laminate 12 sandwiched between the set of plates 13. The battery 1 shown in Figure 1 is composed of two assemblies, the first assembly 2-1 and the second assembly 2-2. Note that the number of assemblies that make up the battery 1 is not limited to two, and may be three or more.

[0013] The first assembly 2-1 and the second assembly 2-2 are stacked in this order with the stacking directions of the laminates 12 of the respective assemblies aligned. The battery 1 further includes a frame 4 that constrains the stacked first assembly 2-1 and second assembly 2-2. The frame 4 constrains one plate 13 of the first assembly 2-1 and one plate 13 of the second assembly 2-2 disposed at both ends in the stacking direction to fix the distance between them.

[0014] The cell 10 is a so-called laminated cell in which a positive electrode, a negative electrode, a separator, and an electrolyte are enclosed in a pack of laminated films. Generally, compared with a can cell in which materials such as a positive electrode are enclosed in a cylindrical or rectangular metal container, the laminated cell has a higher energy density per unit volume and excellent heat dissipation.

[0015] The cell 10 may be a lithium-ion battery or a nickel-metal hydride battery using a liquid electrolyte, or may be an all-solid-state battery using a solid electrolyte. In the all-solid-state battery, the solid electrolyte also serves as a separator. Generally, compared with a lithium-ion battery or the like using a liquid electrolyte, the all-solid-state battery has excellent temperature resistance and a long lifespan.

[0016] In both the cell using a liquid electrolyte and the cell using a solid electrolyte, for the negative electrode, materials with excellent energy density but a large expansion amount, such as metallic lithium or an alloy containing metallic lithium, silicon (Si), etc., may be used. For example, lithium is deposited on the surface of a negative electrode made of metallic lithium or the like by repeated charge and discharge. If there is a variation in the in-plane pressure distribution of the cell 10, the deposition of lithium may be biased. The bias in the deposition of lithium promotes the growth of the deposited lithium in a protrusion shape, which may reach the positive electrode and cause a short circuit. Therefore, it is required to uniformly pressurize each part in the plane of the cell 10 with an appropriate load.

[0017] Furthermore, in cells using solid electrolytes, it is crucial to densify the solid electrolyte and improve the adhesion between the electrodes and the solid electrolyte in order to facilitate ion movement between electrodes. Therefore, it is necessary to apply uniform pressure to various points within the plane of cell 10 with an appropriate load.

[0018] The cushioning material 11 is a pouch in which a fluid such as gas or liquid is sealed inside an insulating bag-shaped packaging material. Based on the isotropy of the fluid pressure inside the cushioning material 11, the load acting on each point in the plane of the cell 10 sandwiched between two adjacent cushioning materials 11 is equalized. Note that the cushioning material 11 is not limited to the above-described pouch, as long as it has cushioning and pressure equalization properties.

[0019] An example of a manufacturing method for the battery 1 will be described with reference to Figures 2 to 7. In the following, the stacking direction of the cells 10 and cushioning material 11 in the laminate 12 of each assembly, and the stacking direction of the first assembly and the second assembly will be described as the vertical direction for convenience.

[0020] Figures 2 to 4 show an example of a retaining member used in the manufacture of battery 1. The first retaining member 20 holds down the upper plate 13b of the first assembly 2-1. A accommodating recess 14 is provided on the upper surface of the upper plate 13b, which faces outward in the stacking direction of the cells 10 and the cushioning material 11. The accommodating recess 14 extends from the side surface of the upper plate 13b along a first direction (X direction) within the upper surface of the upper plate 13b.

[0021] The first retaining member 20 is housed in the receiving recess 14. One end of the first retaining member 20 in the first direction (X direction) extends from the receiving recess 14. As shown in Figure 4, with the first retaining member 20 housed in the receiving recess 14, the upper surface of the upper plate 13b protrudes above the first retaining member 20.

[0022] The bottom surface of the receiving recess 14 is inclined toward the opening on the side of the upper plate 13b, away from the top surface of the upper plate 13b. The first retaining member 20 is tapered to align with the bottom surface of the receiving recess 14.

[0023] The first retaining member 20 and the receiving recess 14 are provided on both sides of the upper plate 13b in the first direction (X direction). On both sides in the first direction, multiple first retaining members 20 and receiving recess 14 are provided at intervals in the second direction (Y direction) that intersects the first direction within the upper surface of the upper plate 13b.

[0024] As shown in Figure 5, the first assembly 2-1 is installed in the pressurizing device. The lower plate 13a of the first assembly 2-1 is supported by the pressurizing device. The first retaining members 20 are housed in each of the receiving recesses 14 of the upper plate 13b of the first assembly 2-1.

[0025] Then, a vertical load is applied to the upper plate 13b of the first assembly 2-1, and the laminate 12 of the first assembly 2-1 is compressed in the stacking direction. With the laminate 12 compressed, the first pressing member 20 is appropriately fixed, and the upper plate 13b is pressed down by the first pressing member 20. As a result, the laminate 12 is kept in a compressed state. While the laminate 12 of the first assembly 2-1 is compressed and the upper plate 13b is pressed down by the first pressing member 20 to keep the laminate 12 in a compressed state, both sides of the laminate 12 in the first direction (X direction) are supported by the side support members 21.

[0026] Next, as shown in Figure 6, the second assembly 2-2 is stacked on top of the first assembly 2-1. The lower plate 13a of the second assembly 2-2 is placed on top of the upper plate 13b of the first assembly 2-1. Then, a vertical load is applied to the upper plate 13b of the second assembly 2-2, and the laminate 12 of the second assembly 2-2 is compressed in the stacking direction. While the laminate 12 of the second assembly 2-2 is being compressed, both sides of the laminate 12 in the first direction (X direction) are supported by the side support members 22.

[0027] Then, as shown in Figure 7, with a load applied to the upper plate 13b of the second assembly 2-2, the first retaining member 20 is removed along the first direction (X direction). As shown in Figure 4, with the first retaining member 20 housed in the housing recess 14, the upper surface of the upper plate 13b of the first assembly 2-1 protrudes above the first retaining member 20. When a load is applied to the upper plate 13b of the first assembly 2-1 via the second assembly 2-2, the upper plate 13b sinks relative to the first retaining member 20, creating a gap between the first retaining member 20 and the bottom surface of the housing recess 14. Therefore, friction between the first retaining member 20 and the upper plate 13b is reduced, and the first retaining member 20 is easily removed in the first direction.

[0028] After this, the frame 4 is assembled to the lower plate 13a of the first assembly 2-1 and the upper plate 13b of the second assembly 2-2, and the load on the upper plate 13b of the second assembly 2-2 is removed.

[0029] In the manufacturing method of the battery 1 shown in Figures 5 to 7, the first assembly 2-1 and the second assembly 2-2 are stacked sequentially, and each time an assembly is stacked, the stacked mass 12 of that assembly is compressed. The number of cells 10 and cushioning material 11 contained in the stacked mass 12 of each assembly is less than the total number of cells 10 and cushioning material 11 that make up the battery 1, and the height of the stacked mass 12 before compression is reduced. Therefore, it becomes possible to miniaturize the pressurizing device.

[0030] Furthermore, because the amount of cells 10 and cushioning material 11 contained in the laminate 12 of each assembly is small, displacement of the cells 10 and cushioning material 11 during compression is suppressed. As a result, the cells 10 and cushioning material 11 can be compressed while maintaining alignment in the lamination direction. Maintaining alignment of the cells 10 and cushioning material 11 in the lamination direction facilitates the assembly of the frame 4. In addition, it becomes possible to uniformly press various points in the plane intersecting the thickness direction of the cells 10. This is useful when the cells 10 are cells using a solid electrolyte, and also when the cells 10 include a negative electrode formed by metallic lithium or the like.

[0031] The first retaining member 20, which holds down the upper plate 13b of the first assembly 2-1, is sandwiched between the first assembly 2-1 and the second assembly 2-2. However, when a load is applied to the first assembly 2-1 and the second assembly 2-2, the friction between the first retaining member 20 and the upper plate 13b is reduced, and the first retaining member 20 can be easily removed in the first direction.

[0032] Preferably, as shown in Figure 5, while the upper plate 13b of the first assembly 2-1 is held down by the first pressing member 20, both sides of the laminate 12 in the first direction (X direction) are supported by the side support members 21. This further suppresses displacement of the cells 10 and the cushioning material 11. As shown in Figure 8, the first pressing member 20 and the side support members 21 may be formed integrally.

[0033] As shown in Figure 9, the third assembly 2-3 may be further stacked, in which case the upper plate 13b of the second assembly 2-2 is held down by the second retaining member 23 while the laminate 12 of the second assembly 2-2 is compressed. The upper plate 13b of the second assembly 2-2 is configured in the same way as the upper plate 13b of the first assembly 2-1, and the second retaining member 23 is configured in the same way as the first retaining member 20. With the third assembly 2-3 stacked, the laminate 12 of the third assembly 2-3 compressed, and a load applied to the upper plate 13b of the third assembly 2-3, the first retaining member 20 and the second retaining member 23 are removed along the first direction (X direction).

[0034] The process of stacking the third assembly 2-3 on top of the first assembly 2-1 and the second assembly 2-2 is basically the same as the process of stacking the second assembly 2-2 on top of the first assembly 2-1 shown in Figure 6, if we consider the first assembly 2-1 and the second assembly 2-2 as a single assembly.

[0035] A modified method for manufacturing battery 1 will be described with reference to Figures 10 and 11. In the manufacturing method for battery 1 shown in Figures 5 to 7, the first assembly 2-1 and the second assembly 2-2 are stacked sequentially, and each time an assembly is stacked, the laminated body 12 of that assembly is compressed. In contrast, in the manufacturing method described below, the laminated bodies 12 of the first assembly 2-1 and the second assembly 2-2 are compressed individually beforehand.

[0036] To maintain the compressed state of the laminate 12 of the first assembly 2-1, the lower plate 13a of the first assembly 2-1 is supported by a pressurizing device, and the upper plate 13b of the first assembly 2-1 is held down by the first pressing member 20. To maintain the compressed state of the laminate 12 of the second assembly 2-2, the lower plate 13a of the second assembly 2-2 is supported by a plate support member 24, and the upper plate 13b of the second assembly 2-2 is held down by the second pressing member 23.

[0037] A receiving recess 15 is provided on the lower surface of the lower plate 13a of the second assembly 2-2, and the plate support member 24 is housed in the receiving recess 15. When the plate support member 24 is housed in the receiving recess 15, the lower surface of the lower plate 13a protrudes downward from the plate support member 24. The bottom surface of the receiving recess 15 is inclined toward the opening on the side of the lower plate 13a so as to move away from the lower surface of the lower plate 13a. The plate support member 24 is tapered to align with the bottom surface of the receiving recess 15.

[0038] As shown in Figure 11, the second assembly 2-2 is stacked on top of the first assembly 2-1, and a load is applied to the upper plate 13b of the second assembly 2-2. With the load applied to the upper plate 13b, the first retaining member 20, the second retaining member 23, and the plate support member 24 are removed along the first direction (X direction).

[0039] Since the laminated bodies 12 of the first assembly 2-1 and the second assembly 2-2 are individually compressed beforehand, the first assembly 2-1 and the second assembly 2-2 can be simply stacked on top of each other, resulting in excellent assembly performance.

[0040] Although embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and modifications, improvements, etc., can be made as appropriate. This specification includes at least the following matters. Note that the components etc. in parentheses indicate those corresponding to the above embodiments, but the invention is not limited thereto.

[0041] (1) A method for manufacturing a battery (battery 1) in which a plurality of cushioning materials (cushioning material 11) and a plurality of cells (cells 10) arranged between two adjacent cushioning materials are stacked, A first assembly (first assembly 2-1) having a first laminate (laminated body 12) containing one or more of the cells and two or more of the cushioning material, and a pair of first plates (plates 13) that compressibly sandwich the first laminate in the lamination direction, A second assembly (second assembly 2-2) having a second laminate (laminated body 12) containing one or more of the aforementioned cells and two or more of the aforementioned cushioning material, and a pair of second plates (plates 13) that compressibly sandwich the second laminate in the lamination direction, Equipped with, The first laminate of the first assembly is compressed, with one first plate being supported and the other first plate being held down by a first pressing member (first pressing member 20). The second plate is placed on top of the other first plate, and the second assembly is stacked on top of the first assembly. The first retaining member is housed in a receiving recess (receiving recess 14) provided on the surface of the other first plate facing outward in the stacking direction, and the surface of the other first plate protrudes outward in the stacking direction more than the first retaining member. The first assembly and the second assembly are pressed in the stacking direction, and while under pressure, the first retaining member is removed along a first direction intersecting the stacking direction. Battery manufacturing method.

[0042] According to the battery manufacturing method described in (1) above, the number of cells and cushioning materials included in the laminate of each assembly is less than the total number of cells and cushioning materials that make up the battery, and the height of the laminate before compression is reduced, making it possible to miniaturize the pressurizing device. In addition, because the number of cells and cushioning materials included in the laminate of each assembly is small, displacement of the cells and cushioning materials during compression is suppressed. The first retaining member is sandwiched between the first assembly and the second assembly, but when a load is applied to the first and second assemblies, the friction between the first retaining member and the housing recess is reduced, and the first retaining member 20 can be easily removed in the first direction.

[0043] (2) A method for manufacturing the battery described in (1) above, The first retaining member and the receiving recess are provided on both sides in the first direction of the surface of the other first plate. Battery manufacturing method.

[0044] According to the battery manufacturing method of (2) above, the length of the first retaining member in the first direction can be shortened, and it becomes even easier to remove the first retaining member in the first direction.

[0045] (3) A method for manufacturing the battery described in (2) above, The first retaining member and the receiving recess are provided in multiple locations on the surface of the other first plate at intervals in a second direction intersecting the first direction. Battery manufacturing method.

[0046] According to the battery manufacturing method described in (3) above, the first plate of the first assembly can be stably held in place by the first retaining member.

[0047] (4) A method for manufacturing the battery described in (1) above, While the other first plate is held in place by the first pressing member, both sides of the first laminate in the first direction are supported by the side support members (side support members 21). Battery manufacturing method.

[0048] According to the battery manufacturing method described in (4) above, misalignment of cells and cushioning material can be further suppressed.

[0049] (5) A method for manufacturing the battery described in (4) above, The first pressing member and the side support member are integrally formed. Battery manufacturing method.

[0050] According to the battery manufacturing method described in (5) above, the manufacturing process for battery 1 can be simplified.

[0051] (6) A method for manufacturing the battery described in (1) above, The bottom surface of the receiving recess is inclined away from the surface of the first plate toward the removal opening from which the first retaining member is removed. The first retaining member is tapered so as to align with the bottom surface of the receiving recess. Battery manufacturing method.

[0052] According to the battery manufacturing method described in (6) above, it becomes even easier to remove the first retaining member in the first direction.

[0053] (7) A method for manufacturing the battery described in (1) above, The second stack of the second assembly, which is stacked on top of the first assembly, is not compressed. When pressurizing the first assembly and the second assembly, the second laminate is compressed. Battery manufacturing method.

[0054] According to the battery manufacturing method described in (7) above, the compression of the second laminate and the removal of the first retaining member can be performed by a series of pressurizations on the first assembly and the second assembly, thus providing excellent ease of assembly.

[0055] (8) A method for manufacturing the battery described in (1) above, The second laminate of the second assembly, which is stacked on the first assembly, is compressed, and one of the second plates is supported by a plate support member (plate support member 24) and the other second plate is held down by a second pressing member (second pressing member 23) so as to maintain the compressed state of the second laminate. The plate support member is housed in a receiving recess (receiving recess 15) provided on the surface of one of the second plates facing outward in the stacking direction, and the surface of one of the second plates protrudes outward in the stacking direction more than the first pressing member. The second retaining member is housed in a receiving recess (receiving recess 14) provided on the surface of the other second plate facing outward in the stacking direction, and the surface of the other second plate protrudes outward in the stacking direction more than the first retaining member. The other second plate of the second assembly, which is stacked on the first assembly, is pressed toward the first assembly, and while under pressure, the first retaining member is removed along a first direction intersecting the stacking direction of the first and second assemblies. The first assembly and the second assembly are pressed in the stacking direction, and while under pressure, the plate support member and the second retaining member are removed along a first direction intersecting the stacking direction. Battery manufacturing method.

[0056] According to the battery manufacturing method described in (8) above, the laminates of the first assembly and the second assembly are individually compressed beforehand, resulting in excellent ease of assembly.

[0057] (9) A method for manufacturing a battery according to any of the above (1) to (8), The cell contains a solid electrolyte. Battery manufacturing method.

[0058] (10) A method for manufacturing a battery according to any of the above (1) to (8), The negative electrode of the cell comprises metallic lithium or an alloy containing metallic lithium. Battery manufacturing method.

[0059] (11) A method for manufacturing a battery according to any of the above (1) to (8), The negative electrode of the cell contains silicon, Battery manufacturing method.

[0060] (12) A method for manufacturing a battery according to any of the above (1) to (8), The cushioning material contains a fluid sealed in the packaging material. Battery manufacturing method. [Explanation of Symbols]

[0061] 1 Battery 2-1 First Assembly 2-2 Second Assembly 2-3 Third Assembly 4 frames 10 cells 11 Cushioning material 12-layer structure 13a Lower plate 13b Upper plate 14 Recessed 15 Receiving recess 20 First retaining member 21 Side support member 22 Side support member 23 Second retaining member 24 Plate support member

Claims

1. A method for manufacturing a battery in which multiple cushioning materials and multiple cells, each placed between two adjacent cushioning materials, are stacked, A first assembly comprising a first laminate containing one or more of the cells and two or more of the cushioning material, and a set of first plates compressibly sandwiching the first laminate in the stacking direction, A second assembly comprising a second laminate containing one or more of the cells and two or more of the cushioning material, and a pair of second plates compressibly sandwiching the second laminate in the stacking direction, Equipped with, The first laminate of the first assembly is compressed, with one first plate being supported and the other first plate being held down by a first pressing member. The second plate is placed on top of the other first plate, and the second assembly is stacked on top of the first assembly. The first retaining member is housed in a receiving recess provided on the surface of the other first plate facing outward in the stacking direction, and the surface of the other first plate protrudes outward in the stacking direction more than the first retaining member. The first assembly and the second assembly are pressed in the stacking direction, and while under pressure, the first retaining member is removed along a first direction intersecting the stacking direction. Battery manufacturing method.

2. A method for manufacturing a battery according to claim 1, The first retaining member and the receiving recess are provided on both sides in the first direction of the surface of the other first plate. Battery manufacturing method.

3. A method for manufacturing a battery according to claim 2, The first retaining member and the receiving recess are provided in multiple locations on the surface of the other first plate at intervals in a second direction intersecting the first direction. Battery manufacturing method.

4. A method for manufacturing a battery according to claim 1, While the other first plate is held in place by the first pressing member, both sides of the first laminate in the first direction are supported by the side support members. Battery manufacturing method.

5. A method for manufacturing a battery according to claim 4, The first pressing member and the side support member are formed integrally. Battery manufacturing method.

6. A method for manufacturing a battery according to claim 1, The bottom surface of the receiving recess is inclined away from the surface of the first plate toward the removal opening from which the first retaining member is removed. The first retaining member is tapered so as to align with the bottom surface of the receiving recess. Battery manufacturing method.

7. A method for manufacturing a battery according to claim 1, The second stack of the second assembly, which is stacked on the first assembly, is not compressed. When pressurizing the first assembly and the second assembly, the second laminate is compressed. Battery manufacturing method.

8. A method for manufacturing a battery according to claim 1, The second laminate of the second assembly, which is stacked on the first assembly, is compressed, and one of the second plates is supported by a plate support member and the other second plate is held down by a second pressing member so as to maintain the compressed state of the second laminate. The plate support member is housed in a receiving recess provided on the surface of one of the second plates facing outward in the stacking direction, and the surface of one of the second plates protrudes outward in the stacking direction more than the first pressing member. The second retaining member is housed in a receiving recess provided on the surface of the other second plate facing outward in the stacking direction, and the surface of the other second plate protrudes outward in the stacking direction more than the first retaining member. The other second plate of the second assembly, which is stacked on the first assembly, is pressed toward the first assembly, and while under pressure, the first retaining member is removed along a first direction intersecting the stacking direction of the first and second assemblies. The first assembly and the second assembly are pressed in the stacking direction, and while under pressure, the plate support member and the second retaining member are removed along a first direction intersecting the stacking direction. Battery manufacturing method.

9. A method for manufacturing a battery according to any one of claims 1 to 8, The cell contains a solid electrolyte. Battery manufacturing method.

10. A method for manufacturing a battery according to any one of claims 1 to 8, The negative electrode of the cell comprises metallic lithium or an alloy containing metallic lithium. Battery manufacturing method.

11. A method for manufacturing a battery according to any one of claims 1 to 8, The negative electrode of the cell contains silicon, Battery manufacturing method.

12. A method for manufacturing a battery according to any one of claims 1 to 8, The cushioning material contains a fluid sealed in the packaging material. Battery manufacturing method.

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