Method and apparatus for manufacturing all-solid-state batteries

Abstract

The present invention discloses a method and apparatus for manufacturing an all-solid-state battery in which cell distortion does not occur and cracks do not occur in the electrodes and electrolyte layers, even while isotropically pressurized. The method for manufacturing the all-solid-state battery includes the steps of: (a) positioning a lower jig having an opening formed in its center; (b) housing the cup portion of a pouch cell downward into the opening of the lower jig, and placing the sealing portion located on the outer circumference of the cup portion over the upper surface of the lower jig to fix the pouch cell; (c) fixing an upper jig having an opening formed in its center to the upper part of the lower jig such that the openings overlap and the sealing portion of the pouch cell is pressed against it; and (d) isotropically pressurizing the pouch cell while it is seated on the upper and lower jigs.

Description

[Technical Field]

[0001] This application claims priority under Korean Patent Application No. 10-2023-0110051 dated August 22, 2023, and incorporates all the contents disclosed in the said Korean Patent Application as part of this Specification.

[0002] The present invention relates to a method and apparatus for manufacturing an all-solid-state battery, and more particularly to a method and apparatus for manufacturing an all-solid-state battery that does not cause cell distortion and does not cause cracks in the electrodes and electrolyte layer, even when isotropic pressurization is performed. [Background technology]

[0003] As technological development and demand for mobile devices and automobiles explode, more research is being conducted on rechargeable batteries with high energy density, discharge voltage, and excellent output stability. Examples of such rechargeable batteries include lithium-sulfur batteries, lithium-ion batteries, and lithium-ion polymer batteries. These rechargeable batteries can be classified into cylindrical, prismatic, and pouch types based on their shape, and among these, interest in and demand for pouch-type battery cells are gradually increasing. Pouch-type battery cells can be stacked with a high degree of integration, have a high energy density per unit weight, are inexpensive, and are easily deformable. Therefore, pouch-type battery cells can be manufactured in shapes and sizes applicable to various mobile devices and automobiles.

[0004] Such pouch-type battery cells generally have a structure in which one or more unit cells, each containing a positive electrode, a negative electrode, and a separator membrane interposed between them, are stacked (i.e., an electrode assembly or stack cell). After housing this electrode assembly in a battery case, an electrolyte is injected, or the product can be manufactured with a solid electrolyte already present within the electrode assembly from the beginning (i.e., an all-solid-state battery).

[0005] Among these, all-solid-state batteries are superior to other types of rechargeable batteries in terms of safety and are attracting attention, particularly in the fields of electric vehicles and mobile devices. In other words, all-solid-state batteries are batteries in which the electrolyte used in conventional lithium rechargeable batteries is replaced from liquid to solid. As a result, since flammable solvents are not used, ignition and explosion due to the decomposition reaction of conventional electrolytes do not occur at all, and safety can be greatly improved. In addition, all-solid-state batteries also have the advantage that the energy density relative to the mass and volume of the battery can be dramatically improved because lithium metal or lithium alloy can be used as the negative electrode material.

[0006] On the other hand, solid electrolytes in all-solid-state batteries can be broadly classified into organic (polymer) solid electrolytes and inorganic solid electrolytes, and inorganic solid electrolytes can be further divided into sulfide-based and oxide-based types. Currently, the most technologically advanced solid electrolyte is the sulfide-based solid electrolyte, with development progressing to the point where its ionic conductivity is close to that of organic electrolytes. Thus, sulfide-based solid electrolytes are among the most advanced solid electrolytes. -3 S / cm~10 -2 In addition to possessing high ionic conductivity of S / cm, it also has excellent thermal stability and, due to its ductility, offers the advantage of good interface compatibility, which is beneficial for improving resistance.

[0007] In the manufacturing process of these sulfide-based all-solid-state batteries, a warm isostatic pressing (WIP) process is generally applied to ensure proper bonding of the electrode-solid electrolyte interface (i.e., electrodes and other components are wrapped in a pouch, sealed, and then pressurized). This is because if the electrode-solid electrolyte interface is not properly bonded and the interface is not formed correctly, lithium (Li) ions will have difficulty moving, and the battery will not be able to operate.

[0008] FIG. 1 is an image showing how a distortion phenomenon occurs when a pouch cell is pressurized using a normal method. However, as shown in FIG. 1, there is a problem that a distortion phenomenon of the pouch cell occurs during the isotropic pressurization process, and cracks occur in the electrodes. FIG. 2 is a schematic diagram of pressurizing a pouch cell using a normal method. To prevent the above problem, as shown in FIG. 2, after wrapping the electrode assembly (10) with a pouch (20) and then fixing the sealed pouch cell to a plate (30) located on the bottom surface (a in FIG. 2), the isotropic pressurization process is carried out (b in FIG. 2) (the arrow in b of FIG. 2 means pressure application). However, in this case, since one side (electrode) of the pouch cell in contact with the plate is blocked by the plate, the isotropic pressurization process cannot be carried out normally. Also, in the case of a pouch cell having a Bi-Cell form, cracks may occur not only in the electrodes but also in the electrolyte layer due to the deformation of the pouch (cracks occur in the portion indicated by the dotted circle in FIG. 2a). Therefore, it is necessary to search for a novel manufacturing method of an all-solid-state battery that does not cause the above problem while isotropically pressurizing the pouch cell. SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] An object of the present invention is to provide a manufacturing method and apparatus for an all-solid-state battery that do not cause a distortion phenomenon of the cell and do not cause cracks in the electrodes and the electrolyte layer while performing isotropic pressurization. MEANS FOR SOLVING THE PROBLEMS

[0010] To achieve the above object, the present invention provides a method for manufacturing an all-solid-state battery, including: (a) arranging a lower jig having an opening formed at a central portion thereof; (b) accommodating a cup portion of a pouch cell downward into the opening of the lower jig, hanging a sealing portion located at an outer peripheral portion of the cup portion on an upper surface of the lower jig, and fixing the pouch cell; (c) fixing an upper jig having an opening formed at a central portion thereof above the lower jig such that the openings overlap and the sealing portion of the pouch cell is pressure-bonded; and (d) isotropically pressurizing the pouch cell while seated on the upper and lower jigs.

[0011] The present invention also provides a manufacturing apparatus for an all-solid-state battery, including a lower jig having an opening for accommodating a cup portion of a pouch cell and an upper surface for supporting a sealing portion of the pouch cell at a central portion thereof, and an upper jig located above the lower jig, having an opening overlapping with the opening of the lower jig and a lower surface for pressurizing the sealing portion of the pouch cell.

Advantages of the Invention

[0012] According to the method and apparatus for manufacturing an all-solid-state battery of the present invention, there is an advantage that while isotropically pressurizing the pouch cell, no distortion phenomenon occurs in the cell, and cracks do not occur in the electrodes and electrolyte layers constituting the pouch cell.

Brief Description of the Drawings

[0013] [Figure 1] It is an image showing a state where a distortion phenomenon occurs when a pouch cell is pressurized using a normal method. [Figure 2] It is a schematic diagram showing a pouch cell being pressurized using a normal method. [Figure 3] It is a schematic diagram showing a state during preparation using a jig before isotropically pressurizing a pouch cell according to an embodiment of the present invention. [Figure 4] It is a schematic diagram showing a laminated structure of an electrode assembly located inside a pouch cell isotropically pressurized according to an embodiment of the present invention. [Figure 5]This is a schematic diagram showing a pouch cell being isotropically pressurized according to one embodiment of the present invention. [Figure 6] This is an image of the appearance of a pouch cell that has been isotropically pressed according to one embodiment of the present invention. [Modes for carrying out the invention]

[0014] The present invention will be described in detail below with reference to the attached drawings.

[0015] Figure 3 is a schematic diagram showing the preparation of a pouch cell using a jig before isotropically pressurizing it according to one embodiment of the present invention. Referring to Figure 3, the method for manufacturing an all-solid-state battery according to the present invention includes the steps of: (a) positioning a lower jig having an opening formed in the center; (b) placing the cup part of the (not isotropically pressurized) pouch cell downward into the opening of the lower jig, and placing the sealing part located on the outer circumference of the cup part (or located on the outermost edge with respect to the horizontal direction of the pouch cell) on the upper surface of the lower jig to fix the pouch cell; (c) fixing an upper jig having an opening formed in the center onto the upper part of the lower jig such that the openings overlap and the sealing part of the pouch cell is pressed against it; and (d) isotropically pressurizing the pouch cell while it is seated on the upper and lower jigs.

[0016] To manufacture the all-solid-state battery according to the present invention, first, as shown in Figure 3, it is necessary to position a lower jig (Jig, 100) having an opening (h) formed in the center (step a). At this time, it is preferable that the opening (h) of the lower jig (100) faces upward with respect to the ground so that the cup portion of the pouch cell, which will be described later, is inserted downward into the opening (h) of the lower jig (100).

[0017] On the other hand, Figure 3 shows the lower jig (100) as having a hexahedral shape. However, this is merely for illustrative purposes, and there are no particular restrictions on the shape of the lower jig (100), as long as it has an opening capable of accommodating the cup portion of the pouch cell. Furthermore, there are no particular restrictions on the width or height of the lower jig (100) or the opening (h), and these may vary depending on the specifications of the pouch cell or the cup portion of the pouch cell.

[0018] As described above, after positioning the lower jig (100) having an opening (h) in the center, the cup part (240) of the pouch cell (200) that is not isotropically pressurized is placed downward into the opening (h) of the lower jig (100), and the sealing part (250) located on the outer circumference of the cup part (240) is placed on the upper surface of the lower jig to fix the pouch cell (200) (step b).

[0019] Figure 4 is a schematic diagram showing the laminated structure of an electrode assembly located inside an isotropically pressurized pouch cell according to one embodiment of the present invention. The pouch cell (200) may be a mono-cell in which a solid electrolyte (230) and a positive electrode (or a positive electrode without a current collector (222) or a free-standing positive electrode, 220) are sequentially laminated on one side of a negative electrode (210), and a normal pouch is placed over it. Alternatively, as shown in Figure 4, the pouch cell (200) may be a bi-cell in which a solid electrolyte (230) and a positive electrode (or a positive electrode without a current collector (222) or a free-standing positive electrode, 220) are sequentially laminated on both sides of a negative electrode (210), and a normal pouch is placed over it. Furthermore, the pouch cell (200) may include a structure greater than or equal to a bi-cell, or it may include cells with different electrode and electrolyte laminated structures than those described above.

[0020] As described above, an electrode assembly such as a monocell or bicell is housed in the pouch cell (200), and the edge formed by sealing the pouch placed over the electrode assembly is called the sealing part. The remaining part excluding the sealing part, that is, the part protruding from the sealing part, is called the cup part. Figure 5 is a schematic diagram showing an isotropically pressurized pouch cell according to one embodiment of the present invention. On the other hand, in the pouch cell (200) of the present invention, the sealing part (250) of the pouch (260) may be located on the outermost side with respect to the stacking direction of the cells (Figure 5a), may be located in the center (Figure 5b), or may be located in between these, and is not particularly limited.

[0021] Referring to this, step (b) can be described in more detail. After positioning the lower jig (100), it is necessary to accommodate the cup portion (240) of the pouch cell (200) that has not been isotropically pressed downward into the opening (h) of the lower jig (100). At this time, only the cup portion (240) of the pouch cell (200) must be accommodated in the opening (h) of the lower jig (100). Therefore, the size of the opening (h) of the lower jig (100) may vary depending on the specifications of the cup portion of the pouch cell that is to be isotropically pressed.

[0022] Furthermore, the height of the opening (h) of the lower jig (100) may be the same as or higher than the height of the cup portion (240) of the pouch cell (200). For example, the height of the opening (h) of the lower jig (100) may be the value obtained by subtracting the "height of the surface of the sealing portion (250) in an unfolded state" from the "height of the surface of the cup portion (240)" of the pouch cell (200). However, if the opening (h) of the lower jig (100) is higher than the height of the cup portion (240) of the pouch cell (200), when pressurized, the cup portion (240) of the pouch cell (200) may be pushed into the empty space of the opening (h), preventing normal pressurization, and the sealing portion (250) connected to the cup portion (240) may also be caught in the opening (h) of the lower jig (100). Therefore, it is preferable that the height of the opening (h) of the lower jig (100) be the same as the height of the cup portion (240) of the pouch cell (200).

[0023] Therefore, when the cup portion (240) of the pouch cell (200) is properly housed in the opening (h) of the lower jig (100), the sealing portion (250) located on the outermost edge of the pouch cell (200) relative to the horizontal direction can only rest on the upper surface of the lower jig (100) (more specifically, the area around the opening (h) on the upper surface of the lower jig (100)). This allows the cup portion (240) of the pouch cell (200) to be fixed in place within the opening (h) of the lower jig (100).

[0024] On the other hand, a groove (groove, 120) may be further formed on the upper surface of the lower jig (100) along the periphery of the opening (h), as shown in Figure 3. This is a means of more stably fixing the sealing portion (250) of the pouch cell (200). After positioning the sealing portion (250) of the pouch cell (200) along the groove (120), the sealing portion (250) can be completely fixed by fitting an elastic ring into the position corresponding to the groove (120). That is, after the sealing portion (250) of the pouch cell (200) is positioned over the upper surface of the lower jig (100) and covers the groove (120), the sealing portion (250) can be fixed by fitting an elastic ring into the groove (120) with the sealing portion (250) of the pouch cell (200) interposed between them.

[0025] Next, after the cup portion (240) of the pouch cell (200), which is not isotropically pressurized, is placed in the opening (h) of the lower jig (100) as described above, the upper jig (300), which has an opening formed in the center, is fixed to the upper part of the lower jig (100) such that the openings overlap and the sealing portion (250) of the pouch cell (200) is pressed against it (step c). For example, an upper jig (300) having the same shape as the lower jig (100) can be placed on top of the lower jig (100) in the same position, and the sealing portion (250) of the pouch cell (200) can be pressed and fixed.

[0026] This is to allow for smoother pressurization of the cup portion (240) of the pouch cell (200), in addition to compressing and fixing the sealing portion (250) of the pouch cell (200). At this time, it is necessary to fix the upper jig (300) and the lower jig (100) so that they do not shift relative to each other. For this reason, adhesive means or fastening means may be used. However, considering the convenience of repeated work, it is preferable to form screw grooves in each of the upper jig (300) and the lower jig (100) and fasten them with screws, as shown in Figure 3 (i.e., fasten them via screws and bolts).

[0027] On the other hand, it is preferable that the upper jig (300) and the lower jig (100) are made of materials that have no voids or very few voids. In particular, if there are voids (pores) in the jigs (100, 300) during the isotropic pressurization process, cracking may occur. Therefore, the void ratio of the upper jig (300) and the lower jig (100) may be less than 1%, preferably less than 0.5%, and more preferably less than 0.1%. Furthermore, the upper jig (300) and the lower jig (100) may be made of either steel or ceramic, but are not limited to these materials. Furthermore, the upper jig (300) and the lower jig (100) may be made of the same material or different materials, and are not particularly limited in this regard.

[0028] Finally, the upper jig (300) is placed on top of the lower jig (100), and the sealing portion (250) of the pouch cell (200) is pressed and secured. Then, the pouch cell (200) is subjected to isotropic pressure while seated on the upper jig (300) and the lower jig (100) (step d). The pouch cell (or all-solid-state battery) that has been isotropically pressed through the above process may be stored or used in a separate storage case or the like.

[0029] The isotropic pressing method may be selected from the group consisting of warm isotropic pressing (WIP), hot isotropic pressing (HIP), and cold isotropic pressing (CIP). Furthermore, it is preferable that these isotropic pressing methods be performed at a temperature within an appropriate range where interfacial contact between electrodes is properly achieved through the molding of the solid electrolyte, and the electrode components are thermally stable. For example, warm isotropic pressing (WIP) may be performed at 45 to 100°C.

[0030] Next, with reference to Figure 3, a manufacturing apparatus for an all-solid-state battery according to the present invention will be described. The manufacturing apparatus for the all-solid-state battery includes a lower jig (100) in the center, which includes an opening (h) for housing the cup portion (240) of the pouch cell (200) and an upper surface for supporting the sealing portion (250) of the pouch cell (200), and an upper jig (300) located above the lower jig (100), which includes an opening that overlaps with the opening (h) of the lower jig (100) and a lower surface for pressurizing the sealing portion (250) of the pouch cell (200).

[0031] Furthermore, a groove (120) may be formed on the upper surface of the lower jig (100) along the periphery of the opening (h), as shown in Figure 3. An elastic ring may then be inserted into the groove (120) with the sealing portion (250) of the pouch cell (200) interposed between them. A detailed explanation of this and the remaining configurations will be omitted as they are the same as those explained in the section on the manufacturing method of the all-solid-state battery.

[0032] On the one hand, in the all-solid-state battery manufactured by the method for manufacturing an all-solid-state battery according to the present invention, the positive electrode may contain a positive electrode active material, a conductive material, and a binder in a granular form. Among these, as the positive electrode active material, any material that can be used as the positive electrode active material of the all-solid-state battery may be used without limitation. The positive electrode active material may be a lithium transition metal oxide containing one or more transition metals. For example, the positive electrode active material may be LiCoO2, LiNiO2, LiMnO2, Li2MnO3, LiMn2O4, Li(Ni a Co b Mn c )O2 (0 < a < 1, 0 < b < 1, 0 < c < 1, a + b + c = 1), LiNi 1-y Co y O2 (0 < y < 1), LiCo 1-y Mn y O2, LiNi 1-y Mn y O2 (0 < y < 1), Li(Ni a Co b Mn c )O4 (0 < a < 2, 0 < b < 2, 0 < c < 2, a + b + c = 2), LiMn 2-z Ni z O4 (0 < z < 2), LiMn 2-z Co z O4 (0 < z < 2) and those selected from the group consisting of combinations thereof may be used.

[0033] <00Furthermore, the binder is mixed together with the positive electrode active material and conductive material, which are fine particles in powder form, to bind the components together and help the particles grow. For example, sulfide-based solid electrolytes have properties that are sensitive to moisture, such as generating H2S gas when they come into contact with water, so it is preferable to remove as much moisture as possible from the time of granule formation. The binder may be an organic binder, and the organic binder refers to a binder that dissolves or disperses in an organic solvent, particularly N-methylpyrrolidone (NMP), and is distinguished from aqueous binders that use water as a solvent or dispersion medium. For example, the binder may be selected from the group consisting of polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-co-HFP), polyvinyl alcohol, starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, polyimide, polyamideimide, polyethylene, polypropylene, ethylene-propylene-diene monomer (EPDM), sulfonated EPDM, styrene-butylene rubber, and fluororubber, but is not limited to these.

[0034] In the all-solid-state battery described above, the solid electrolyte may contain one or more selected from sulfide-based solid electrolytes, polymer-based solid electrolytes, and oxide-based solid electrolytes, and it is preferable to contain only a sulfide-based solid electrolyte. The sulfide-based solid electrolyte may contain a lithium salt, and the lithium salt may be an ionizable lithium salt. + X - It may also be represented as follows. Such lithium salt anions are not particularly limited, but F - Cl - , Br - , I - NO3 - , N(CN)2 - BF4 - ClO4 - PF6 - (CF3)2PF4 - (CF3)3PF3 - (CF3)4PF2 - (CF3)5PF - (CF3)6P- CF3SO3 - CF3CF2SO3 - (CF3SO2)2N - , (FSO2)2N - CF3CF2(CF3)2CO - (CF3SO2) 2CH - (SF5)3C - , (CF3SO2)3C - CF3(CF2)7SO3 - CF3CO2 - CH3CO2 - SCN - and (CF3CF2SO2)2N - These are some examples.

[0035] Furthermore, the sulfide-based solid electrolyte contains sulfur (S) and has ionic conductivity of a metal belonging to Group 1 or Group 2 of the periodic table, and may also include Li-PS glass or Li-PS glass ceramic. Non-limiting examples of such sulfide-based solid electrolytes include Li2S-P2S5, Li2S-LiI-P2S5, Li2S-LiI-Li2O-P2S5, Li2S-LiBr-P2S5, Li2S-LiCl-P2S5, Li2S-Li2O-P2S5, Li2S-Li3PO4-P2S5, Li2S-P2S5-P2O5, Li2S-P2S5-SiS2, Li2S-P2S5-SnS, Li2S-P2S5-Al2S3, Li2S-GeS2, and Li2S-GeS2-ZnS, and the sulfide-based solid electrolyte may contain one or more of these.

[0036] Such a solid electrolyte may also perform the same role as the separator in a typical lithium secondary battery (i.e., electrically insulating the negative and positive electrodes while simultaneously allowing lithium ions to pass through). On the other hand, the all-solid-state battery may be used as a semi-solid-state battery by including a liquid electrolyte as needed, in which case an additional polymer separator may be required.

[0037] In the all-solid-state battery, the negative electrode may contain a negative electrode active material that can be used in a normal all-solid-state battery. For example, the negative electrode active material may be carbon such as graphitizable carbon and graphite-based carbon; Li x Fe2O3(0≦x≦1), Li x WO2(0≦x≦1), Sn x Me 1-x Me’ y O z (Me: Mn, Fe, Pb, Ge; Me’: Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, halogen; 0<x≦1; 1≦y≦3; 1≦z≦8) and other metal composite oxides; lithium metal; lithium alloy; silicon-based alloy; tin-based alloy; metal oxides such as SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4 and Bi2O5; conductive polymers such as polyacetylene; Li-Co-Ni-based materials; titanium oxides; lithium titanium oxides; etc. It may contain any one or more selected from the above.

[0038] The present invention also provides a battery module including the all-solid-state battery as a unit cell, a battery pack including the battery module, and a device including the battery pack as a power source. Specific examples of the device include power tools powered by an electric motor; electric vehicles including electric vehicles (Electric Vehicle, EV), hybrid electric vehicles (Hybrid Electric Vehicle, HEV), plug-in hybrid electric vehicles (Plug-in Hybrid Electric Vehicle, PHEV), etc.; electric two-wheel vehicles including electric bicycles (E-bike) and electric scooters (E-scooter); electric golf carts; and power storage systems; etc., but are not limited thereto.

[0039] The following are preferred embodiments to aid in understanding the present invention. However, these embodiments are illustrative of the present invention, and it will be obvious to those skilled in the art that various changes and modifications are possible within the scope of the present invention and the technical concept, and such changes and modifications will naturally fall within the scope of the attached claims.

[0040] [Example 1] Manufacturing of all-solid-state batteries First, a lower jig made of steel with an opening formed in the center was placed, and the cup portion of the pouch cell, which has the shape shown in Figure 5a, was placed downward into the opening of the lower jig. The sealing portion located on the outer circumference of the cup portion was then placed on the upper surface of the lower jig, and the cup portion of the pouch cell was fixed in place while it was housed in the opening of the lower jig. Next, an upper jig of the same shape and material as the lower jig was placed on top of the lower jig in the same position, and the sealing portion of the pouch cell was pressed and fixed. Finally, with the pouch cell seated on the upper and lower jigs, it was subjected to warm isotropic pressurization (WIP).

[0041] [Example 2] Manufacturing of all-solid-state batteries The procedure was the same as in Embodiment 1, except that a groove was further formed along the periphery of the opening of the lower jig, and an elastic ring was fitted into the groove with the sealing portion of the pouch cell interposed between them.

[0042] [Comparative Example 1] Manufacturing of all-solid-state batteries Instead of using a jig, as shown in Figure 2, a plate was positioned on the bottom surface, and then a pouch cell (the same as the one used in Example 1) was fixed to the top of the plate and subjected to warm isotropic pressurization (isotropic pressurization under the same conditions as in Example 1).

[0043] [Experimental Example 1] Appearance evaluation of isotropically pressurized pouch cells The appearance of the isotropically pressurized pouch cells in Examples 1 and 2 and Comparative Example 1 was observed, and it was also confirmed whether or not cracks occurred in the electrode and electrolyte layers.

[0044] As described above, when observing the appearance of the isotropically pressurized pouch cells in Examples 1 and 2 and Comparative Example 1, in the case of Comparative Example 1, where the pouch cells were isotropically pressurized using a plate, distortion occurred in the pouch cells as shown in Figure 1, and upon inspection of the interior, cracks were found to have occurred in the electrode and electrolyte layers.

[0045] Figure 6 shows an external view of an isotropically pressurized pouch cell according to one embodiment of the present invention. On the other hand, in Examples 1 and 2, in which the pouch cell was isotropically pressurized using a pair of jigs with openings, as shown in Figure 6, both the front (a in Figure 6) and back (b in Figure 6) of the pouch cell were manufactured as intended without any distortion, and no cracks occurred in the internal electrode and electrolyte layers. [Explanation of symbols]

[0046] 100: Lower jig (h: opening, 120: groove) 200: Pouch cell (210: Negative electrode, 220: Positive electrode, 230: Electrolyte, 240: Cup section, 250: Sealing section, 260: Pouch) 300: Upper jig

Claims

1. (a) A step of positioning a lower jig having an opening formed in the center, (b) The step of housing the cup portion of the pouch cell downward into the opening of the lower jig, and securing the pouch cell by placing the sealing portion located on the outer circumference of the cup portion on the upper surface of the lower jig, (c) A step of fixing an upper jig having an opening in the center to the upper part of the lower jig such that the openings overlap and the sealing portion of the pouch cell is pressed together, (d) A method for manufacturing an all-solid-state battery, comprising the step of isotropically pressurizing the pouch cell while it is seated in an upper jig and a lower jig.

2. The method for manufacturing an all-solid-state battery according to claim 1, characterized in that the height of the opening of the lower jig is the same as or greater than the height of the cup portion of the pouch cell.

3. The method for manufacturing an all-solid-state battery according to claim 1, characterized in that a groove is further formed on the upper surface of the lower jig along the periphery of the opening.

4. A method for manufacturing an all-solid-state battery according to claim 3, characterized in that, after positioning the sealing portion of the pouch cell along the groove, an elastic ring is fitted into the position corresponding to the groove to fix the sealing portion.

5. The method for manufacturing an all-solid-state battery according to claim 1, characterized in that the upper jig and the lower jig are fastened together via screws.

6. The method for manufacturing an all-solid-state battery according to claim 1, characterized in that the upper jig and the lower jig have a porosity of less than 1%.

7. The method for manufacturing an all-solid-state battery according to claim 6, characterized in that the upper jig and the lower jig are each made of either steel or ceramic.

8. The method for manufacturing an all-solid-state battery according to claim 1, characterized in that the pouch cell includes a monocell or bicell or more structure.

9. The method for manufacturing an all-solid-state battery according to claim 1, characterized in that the isotropic pressurization is selected from the group consisting of warm isotropic pressurization, hot isotropic pressurization, and cold isotropic pressurization.

10. The method for manufacturing an all-solid-state battery according to claim 1, characterized in that the all-solid-state battery is a sulfide-based all-solid-state battery.

11. A lower jig including an opening in the center for housing the cup portion of the pouch cell and an upper surface for supporting the sealing portion of the pouch cell, A manufacturing apparatus for an all-solid-state battery, comprising: an upper jig located above the lower jig, including an opening that overlaps with the opening of the lower jig and a lower surface that pressurizes the sealing portion of the pouch cell.

12. The manufacturing apparatus for an all-solid-state battery according to claim 11, characterized in that a groove is further formed on the upper surface of the lower jig along the periphery of the opening.

13. The apparatus for manufacturing an all-solid-state battery according to claim 12, characterized in that an elastic ring is inserted into the groove with the sealing portion of the pouch cell interposed between them.

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