Method and apparatus for manufacturing all-solid state battery

Abstract

Disclosed are a manufacturing method and an apparatus for an all-solid-state battery, which apply isostatic pressing without causing distortion of the battery, thereby being capable of preventing crack formation in an electrode and an electrolyte layer. The manufacturing method of the all-solid-state battery includes the steps of: (a) arranging a lower jig having an opening formed in a central portion thereof; (b) accommodating the cup-shaped part of the pouch-type battery cell downwards into the opening of the lower clamp, and fixing the pouch-type battery cell by hanging a sealing part on the periphery of the cup-shaped part on the upper surface of the lower clamp; (c) fixing an upper jig having an opening formed in a center portion to an upper surface of the lower jig so that the openings overlap and the sealing portion of the pouch-type cell is pressed; and (d) applying isostatic pressing to the bag-type battery cell while the bag-type battery cell is located on the upper clamp and the lower clamp.

Description

Technical Field

[0001] This application claims priority to Korean Patent Application No. 10-2023-0110051, filed on August 22, 2023, the disclosure of which is incorporated herein by reference in its entirety.

[0002] The present invention relates to a method and apparatus for manufacturing all-solid-state batteries, and more particularly, to a method and apparatus for manufacturing all-solid-state batteries by performing isostatic pressing without battery distortion, thereby preventing cracks in the electrode and electrolyte layers. Background Technology

[0003] With the explosive growth in technology and demand for mobile devices and automobiles, there is increasing research into secondary batteries with high energy density, high discharge voltage, and good output stability. Examples of such secondary batteries include lithium-based batteries, such as lithium-sulfur batteries, lithium-ion batteries, and lithium-ion polymer batteries. Furthermore, these secondary batteries can be classified according to their shape, such as cylindrical, prismatic, and pouch-shaped, with a growing interest and demand for pouch-shaped individual cells. Pouch-shaped individual cells can be stacked with high integration, have high energy density per unit weight, and are inexpensive and easily deformable. Therefore, pouch-shaped individual cells can be manufactured in various shapes and sizes suitable for use in a variety of mobile devices and automobiles.

[0004] This type of pouch cell typically has a structure with one or more stacked cell units, each cell unit including a positive electrode, a negative electrode, and a separator disposed between the positive and negative electrodes (i.e., an electrode assembly or stack cell). The product can be manufactured by housing the electrode assembly in a battery case and then injecting an electrolyte, or by providing a solid electrolyte from the electrode assembly (i.e., an all-solid-state battery).

[0005] Among these, all-solid-state batteries outperform other types of secondary batteries in terms of safety and are receiving particular attention in fields such as electric vehicles and mobile devices. Specifically, all-solid-state batteries use a solid electrolyte instead of the liquid electrolyte used in conventional lithium-ion secondary batteries. Therefore, they significantly improve safety because they do not use flammable solvents, thus preventing fires or explosions caused by the decomposition reactions of conventional electrolytes. Furthermore, all-solid-state batteries have the advantage of significantly higher energy density relative to battery mass and volume because they can use Li metal or Li alloys as the negative electrode material.

[0006] Meanwhile, the solid electrolytes in all-solid-state batteries can be broadly classified into organic (polymer-based) solid electrolytes and inorganic (mineral-based) solid electrolytes. Inorganic solid electrolytes can be further divided into sulfide-based and oxide-based types. Currently, the most technologically developed solid electrolyte is the sulfide-based solid electrolyte, which has been developed to the point where its ionic conductivity approaches that of organic liquid electrolytes. Therefore, sulfide-based solid electrolytes not only possess high ionic conductivity among solid electrolytes, ranging from 10... -3 S / cm to 10 -2 They have high ionic conductivity (S / cm) and also exhibit excellent thermal stability. Other advantages include ductility, which allows for good contact at the interface, thus improving resistance (interfacial compatibility).

[0007] These sulfide-based all-solid-state batteries are typically manufactured using a warm isostatic pressing (WIP) process (i.e., wrapping the electrodes in a bag, sealing and pressing them) to ensure bonding at the electrode-solid electrolyte interface. If the electrode-solid electrolyte interface is not well bonded, and therefore not well formed, lithium (Li) ions have difficulty moving, and the battery cannot function.

[0008] Figure 1 This diagram illustrates the twisting that occurs when a pouch cell is pressed using conventional methods. However, as... Figure 1 As shown, there is a problem where the pouch cell twists during the isostatic pressing process, resulting in cracks in the electrodes. Figure 2 This is a schematic diagram illustrating the pressing of pouch cells using conventional methods. To prevent the aforementioned problems, such as... Figure 2 As shown, the electrode assembly 10 is wrapped in a bag 20 and sealed, and then the bag-shaped battery cell is fixed to the plate 30 located on the bottom surface. Figure 2 (a), then the isostatic pressing process is performed. Figure 2 b) Figure 2 The arrow in b indicates the application of pressure. However, in this case, because one side of the pouch cell (electrode) in contact with the plate is blocked by the plate, the isostatic pressing process cannot be performed normally, and in the case of a pouch cell with a dual-cell shape, the electrodes and electrolyte layer may rupture due to deformation of the pouch (in Figure 2 (The area enclosed by the dashed line in b) shows cracking. Therefore, it is necessary to seek a new method for manufacturing all-solid-state batteries that can apply isostatic pressure to pouch cells without causing the aforementioned problems. Summary of the Invention

[0009] [Technical Issues]

[0010] Therefore, the object of the present invention is to provide a method and apparatus for manufacturing an all-solid-state battery, wherein no cell twisting occurs during isostatic pressing, and therefore no cracks occur in the electrode and electrolyte layers.

[0011] [Technical Solution]

[0012] To achieve the above objectives, the present invention provides a method for manufacturing an all-solid-state battery, comprising: (a) arranging a lower clamp having an opening formed at its center; (b) receiving a cup-shaped portion of a pouch cell downward into the opening of the lower clamp, and fixing the pouch cell by attaching a sealing portion located on the outer periphery of the cup-shaped portion to the upper surface of the lower clamp; (c) fixing an upper clamp having an opening formed at its center to the upper surface of the lower clamp such that the openings overlap and the sealing portion of the pouch cell is compressed; and (d) applying isostatic pressure to the pouch cell while fixing it in the upper and lower clamps.

[0013] Furthermore, the present invention provides an apparatus for manufacturing all-solid-state batteries, the apparatus comprising: a lower clamp having an opening at its center for receiving a cup-shaped portion of a pouch cell, and an upper surface for supporting a sealing portion of the pouch cell; and an upper clamp disposed above the lower clamp, including an opening overlapping the opening in the lower clamp, and a lower surface for compressing the sealing portion of the pouch cell.

[0014] [Beneficial Effects]

[0015] The method and apparatus for manufacturing all-solid-state batteries of the present invention have the advantage that no twisting occurs in the cell when isostatic pressure is applied to the pouch cell, thereby preventing the rupture of the electrode and electrolyte layers constituting the pouch cell. Attached Figure Description

[0016] Figure 1 It is an image showing the distortion that occurs when a pouch cell is pressed using conventional methods.

[0017] Figure 2 This is a schematic diagram of pressing bag-shaped battery cells using conventional methods.

[0018] Figure 3 This is a schematic diagram illustrating the fabrication of bag-type cells using a fixture before isostatic pressing, according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram showing the stacked structure of the electrode assembly inside the bag-type battery cell after isostatic pressing, according to an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram illustrating a bag-type battery cell after undergoing isostatic pressing according to an embodiment of the present invention.

[0021] Figure 6This is an external image of a bag-type battery cell after undergoing isostatic pressing, according to an embodiment of the present invention. Detailed Implementation

[0022] The invention will now be described in detail with reference to the accompanying drawings.

[0023] Figure 3 This is a schematic diagram of a pouch cell prepared using a fixture before isostatic pressing, according to an embodiment of the present invention. (Reference) Figure 3 The method for manufacturing an all-solid-state battery according to the present invention includes the following steps: (a) arranging a lower clamp having an opening at its center; (b) receiving a cup-shaped portion of a (non-isostatically pressed) pouch cell downward into the opening of the lower clamp, and fixing the pouch cell by placing a sealing portion located on the outer periphery of the cup-shaped portion (or at the outermost horizontal edge of the pouch cell) on the upper surface of the lower clamp; (c) fixing an upper clamp with an opening at its center to the upper surface of the lower clamp such that the openings overlap and the sealing portion of the pouch cell is compressed; and (d) applying isostatic pressure to the pouch cell while it is located on the upper and lower clamps.

[0024] To manufacture the all-solid-state battery of this invention, it is first necessary to arrange... Figure 3 The lower clamp 100 shown has an opening h formed in the center (step a). At this time, the opening h of the lower clamp 100 is preferably positioned such that the cup-shaped portion of the bag-type battery cell described below is inserted downward into the opening h of the lower clamp 100, and the opening h of the lower clamp 100 is arranged to face upward relative to the ground.

[0025] At the same time, Figure 3 In the illustration, the lower clamp 100 is shown as having a hexahedral shape. However, this is merely for illustrative purposes, and there are no particular limitations on the shape of the lower clamp 100, as long as it has an opening for accommodating the cup-shaped portion of the pouch cell. Furthermore, there are no particular limitations on the width or height of the lower clamp 100 or the opening h, which can vary depending on the size of the pouch cell or the cup-shaped portion of the pouch cell.

[0026] As described above, after placing the lower clamp 100, which has an opening h at its center, the cup-shaped portion 240 of the bag-shaped battery cell 200 to be subjected to isostatic pressure is received downward into the opening h of the lower clamp 100, and the sealing portion 250 located on the outer periphery of the cup-shaped portion 240 is hung on the upper surface of the lower clamp, thereby performing the step of fixing the bag-shaped battery cell 200 (step b).

[0027] Figure 4This is a schematic diagram illustrating the stacked structure of the electrode assembly located inside a pouch cell after isostatic pressing, according to an embodiment of the present invention. The pouch cell 200 can be a single cell with a conventional pouch-shaped outer covering, wherein a solid electrolyte 230 and a positive electrode 220 (or a positive electrode excluding the current collector 222 or a self-standing positive electrode) are sequentially stacked on one side of the negative electrode 210. Additionally, as... Figure 4 As shown, the pouch cell 200 can be a dual-cell structure with a conventional pouch-shaped outer covering, wherein a solid electrolyte 230 and a positive electrode 220 (or a positive electrode excluding the current collector 222 or a self-standing positive electrode) are sequentially stacked on both sides of the negative electrode 210. Alternatively, the pouch cell 200 can include a structure with more than two cells, or it can include a cell with an electrode and electrolyte stacking structure different from the one described above.

[0028] As described above, electrode assemblies such as single-cell or dual-cell batteries are housed in a pouch-type battery cell 200, and the boundary portion formed by sealing the pouch on the electrode assembly is referred to as a "sealed portion". Furthermore, the remaining portion other than the sealed portion, i.e., the portion protruding from the sealed portion, is referred to as a "cup-shaped portion". Figure 5 This is a schematic diagram illustrating a pouch cell after isostatic pressing according to an embodiment of the present invention. At this time, for the pouch cell 200 of the present invention, the sealing portion 250 of the pouch 260 can be located on the outermost side of the cell based on the stacking direction. Figure 5 a), or it can be located in the middle ( Figure 5 b), or can be located between these positions without any specific restrictions.

[0029] Referring to this, to explain step (b) more specifically, after the lower clamp 100 is arranged, the cup-shaped portion 240 of the un-isostatically pressured pouch cell 200 should be received downwards into the opening h of the lower clamp 100. In this case, only the aforementioned cup-shaped portion 240 of the pouch cell 200 should be received in the opening h of the lower clamp 100. Therefore, the size of the opening h of the lower clamp 100 can vary depending on the size of the cup-shaped portion of the pouch cell 200 to be subjected to isostatic pressure.

[0030] Furthermore, the height of the opening h of the lower clamp 100 can be equal to or higher than the height of the cup-shaped portion 240 of the pouch cell 200. For example, the height of the opening h of the lower clamp 100 can be the "surface height of the cup-shaped portion 240" of the pouch cell 200 minus the "surface height of the sealing portion 250 in its unbent state". However, if the opening h of the lower clamp 100 is higher than the height of the cup-shaped portion 240 of the pouch cell 200, the cup-shaped portion 240 of the pouch cell 200 may be pushed into the empty space of the opening h during compression, making normal compression impossible. In addition, the sealing portion 250 connected to the cup-shaped portion 240 may also be rolled into the opening h of the lower clamp 100. Therefore, it is preferable that the height of the opening h of the lower clamp 100 is preferably the same as the height of the cup-shaped portion 240 of the pouch cell 200.

[0031] Therefore, when the cup-shaped portion 240 of the pouch cell 200 is properly accommodated in the opening h of the lower clamp 100, the sealing portion 250 located at the outermost edge of the pouch cell 200 in the horizontal direction must rest on the upper surface of the lower clamp 100 (more specifically, on the outer peripheral region of the opening h on the upper surface of the lower clamp 100). Thus, the cup-shaped portion 240 of the pouch cell 200 can be fixed in its state of being accommodated in the opening h of the lower clamp 100.

[0032] Meanwhile, on the upper surface of the lower clamp 100, a groove 120 can be further formed along the outer periphery of the opening h, such as... Figure 3 As shown. This is a means of more stably securing the sealing portion 250 of the pouch cell 200. After positioning the sealing portion 250 of the pouch cell 200 along the groove 120, an elastic ring can be inserted into the position corresponding to the groove 120, thereby completely securing the sealing portion 250. In other words, after the sealing portion 250 of the pouch cell 200 rests on the upper surface of the lower clamp 100 and covers the groove 120, an elastic ring can be inserted into the groove 120 to clamp it between the sealing portions 250 of the pouch cell 200, thereby securing the sealing portion 250.

[0033] Next, after the cup-shaped portion 240 of the unisostatically pressed pouch cell 200 is accommodated in the opening h of the lower clamp 100 as described above, the step of fixing the upper clamp 300, which has an opening formed at its center, to the upper part of the lower clamp 100 is performed, such that the openings overlap and the sealing portion 250 of the pouch cell 200 is compressed (step c). For example, the upper clamp 300 has the same shape as the lower clamp 100 and is stacked on top of the lower clamp 100 at the same position on the upper side of the lower clamp 100, thereby compressing and fixing the sealing portion 250 of the pouch cell 200.

[0034] This is to ensure that the sealing portion 250 of the pouch cell 200 is compressed and fixed, and to allow the cup-shaped portion 240 of the pouch cell 200 to be compressed more smoothly. At this time, it is necessary to fix the upper clamp 300 and the lower clamp 100 so that they do not misalign. For this purpose, adhesive elements or fastening elements can be used. However, considering the convenience of repeated operation, it is preferable to form threaded grooves in each of the upper clamp 300 and the lower clamp 100, such as... Figure 3 As shown, this allows them to be tightened together (i.e., fastened with bolts).

[0035] Preferably, the upper clamp 300 and the lower clamp 100 are each made of a material that is non-porous or has very low porosity. Specifically, the presence of voids (pores) in the upper clamp 100 and the lower clamp 300 during the isostatic pressing process can lead to cracking. Therefore, the porosity of the upper clamp 300 and the lower clamp 100 can be less than 1%, preferably less than 0.5%, and even more preferably less than 0.1%. Furthermore, for example, the upper clamp 300 and the lower clamp 100 can each be made of materials freely selected from, but not limited to, steel and ceramic. Additionally, the upper clamp 300 and the lower clamp 100 can be made of the same material or different materials, but are not limited to these.

[0036] Finally, after overlapping the upper clamp 300 on top of the lower clamp 100 to compress and secure the sealing portion 250 of the pouch cell 200, an isostatic pressure is applied to the pouch cell 200 while it is placed on the upper clamp 300 and the lower clamp 100 (step d). Furthermore, the pouch cell (or all-solid-state battery) that has undergone isostatic pressure processing as described above can be stored or used in a separate housing, etc.

[0037] Isostatic pressing can be performed using any of the following methods: warm isostatic pressing (WIP), hot isostatic pressing (HIP), and cold isostatic pressing (CIP). Isostatic pressing is preferably performed at a temperature within a suitable range that maintains the thermal stability of the electrode components, while ensuring good interfacial contact between the electrodes due to the molding of the solid electrolyte. For example, warm isostatic pressing (WIP) can be performed at temperatures ranging from 45°C to 100°C.

[0038] Next, refer to Figure 3 The present invention will describe an apparatus for manufacturing an all-solid-state battery. The aforementioned apparatus for manufacturing an all-solid-state battery includes: a lower clamp 100 having an opening h at its center for receiving a cup-shaped portion 240 of a pouch cell 200, and an upper surface for supporting a sealing portion 250 of the pouch cell 200; and an upper clamp 300 disposed above the lower clamp 100, including an opening overlapping the opening h in the lower clamp 100, and a lower surface for compressing the sealing portion 250 of the pouch cell 200.

[0039] In addition, on the upper surface of the lower fixture 100, a groove 120 may be further formed along the outer periphery of the opening h, as Figure 3 shown. In addition, an elastic ring may be inserted into the groove 120 so as to be clamped between the sealing portions 250 of the pouch-type battery cell 200. The remaining part of its detailed description and configuration will be omitted because it is the same as that described in the manufacturing method of the all-solid-state battery.

[0040] Meanwhile, in the all-solid-state battery manufactured by the manufacturing method of the all-solid-state battery according to the present invention, the positive electrode may include a positive electrode active material in the form of particles, a conductive material, and a binder. Among them, any positive electrode active material that can be used as the positive electrode active material in the all-solid-state battery can 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 selected from the group consisting of: 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 combinations thereof.

[0041] Furthermore, the aforementioned binder is mixed with powdered fine particles of the positive electrode active material and conductive material to bind the components together and aid in particle growth. For example, sulfide-based solid electrolytes are sensitive to moisture, such as generating H2S gas upon contact with water; therefore, it is desirable to remove as much moisture as possible from particle formation. The binder can be an organic binder, meaning a binder that is soluble or dispersible in an organic solvent, particularly N-methylpyrrolidone (NMP), which differs from aqueous binders where water is the solvent or dispersant. For example, the aforementioned binder can be selected from: polyvinylidene fluoride (PVDF), vinylidene fluoride-hexafluoropropylene copolymer (PVDF-co-HFP), polyvinyl alcohol, starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, polyimide, polyamide-imide, polyethylene, polypropylene, ethylene-propylene-diene monomer (EPDM), sulfonated EPDM, styrene-butadiene rubber, and fluororubber, but is not limited to these.

[0042] In the aforementioned all-solid-state battery, the solid electrolyte may include one or more selected from sulfide-based solid electrolytes, polymer-based solid electrolytes, and oxide-based solid electrolytes, and preferably only includes sulfide-based solid electrolytes. The aforementioned sulfide-based solid electrolyte may include a lithium salt, and the lithium salt may be represented as Li⁺X⁻ as an ionizable lithium salt. The anion of this lithium salt is not particularly limited, but examples include 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 - .

[0043] In addition, the sulfide-based solid electrolyte may include a Li-P-S-based glass or a Li-P-S-based glass-ceramic, which contains sulfur (S) and has an ionic conductivity of a metal belonging to the first or second group of the periodic table. 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, etc., and the above sulfide-based solid electrolytes may include one or more of these.

[0044] This solid electrolyte can simultaneously act as a separator in a conventional lithium secondary battery (i.e., the function of electrically insulating the negative electrode and the positive electrode while allowing lithium ions to pass through). At the same time, the aforementioned all-solid-state battery can be used as a semi-solid battery by adding a liquid electrolyte as needed. In this case, a separate polymer separator may be additionally required.

[0045] In the aforementioned all-solid-state battery, the negative electrode may include a negative electrode active material that can be used in a conventional all-solid-state battery. For example, the negative electrode active material may include one or more selected from the following: carbon, such as non-graphitizable carbon and graphitic carbon; metal composite oxides, such as 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, elements of groups 1, 2, and 3 of the periodic table, halogens; 0 < x ≤ 1; 1 ≤ y ≤ 3; 1 ≤ z ≤ 8); 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 oxide; and lithium titanium oxide.

[0046] Furthermore, 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 above-mentioned device include, but are not limited to: power tools powered by an electric motor; electric vehicles, including electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs); electric two-wheelers, including electric bicycles (E-bicycles) and electric scooters (E-scooters); electric golf carts; and energy storage systems.

[0047] Example

[0048] The following preferred embodiments are presented to aid in understanding the present invention; however, these are merely illustrative of the invention, and it will be clear to those skilled in the art that various changes and modifications can be made within the scope and spirit of the invention, and such changes and modifications naturally fall within the scope of the appended claims.

[0049] [Example 1] Manufacturing of all-solid-state batteries

[0050] First, place a steel lower clamp with an opening in its center, then... Figure 5 The cup-shaped portion of the pouch-type battery cell, as shown in figure a, is received downwards into the opening of the aforementioned lower clamp, and the sealing portion located on the outer periphery of the aforementioned cup-shaped portion is hung on the upper surface of the aforementioned lower clamp, thereby fixing the cup-shaped portion of the aforementioned pouch-type battery cell in its position within the opening of the aforementioned lower clamp. Then, an upper clamp of the same shape and material as the aforementioned lower clamp is stacked on top of the aforementioned lower clamp in the same position, compressing and fixing the sealing portion of the aforementioned pouch-type battery cell. Finally, while the pouch-type battery cell is located in the upper and lower clamps, a thermostatic pressure (WIP) is applied to the aforementioned pouch-type battery cell.

[0051] [Example 2] Manufacturing of all-solid-state batteries

[0052] A groove is further formed along the outer periphery of the opening of the lower clamp, and an elastic ring is inserted into the groove to clamp it between the sealing portions of the bag-shaped battery cell; otherwise, the same process as in Embodiment 1 above is performed.

[0053] [Comparative Example 1] Manufacturing of all-solid-state batteries

[0054] Without using clamps, but as Figure 2 The plate is arranged on the bottom surface, and the bag-type battery cell (the same as that used in Example 1) is fixed to the top of the plate and a thermostatic pressure is applied (the isostatic pressure is applied under the same conditions as in Example 1).

[0055] [Experimental Example 1] Appearance evaluation of bag-type battery cells after isostatic pressing

[0056] The appearance of the bag cells in Examples 1 and 2 and Comparative Example 1 after undergoing isostatic pressing was observed, and the presence of cracks in the electrodes and electrolyte layers was also checked.

[0057] As a result of observing the appearance of the pouch cells after undergoing isostatic pressing in Examples 1, 2 and Comparative Example 1 as described above, in the case of Comparative Example 1 where an isostatic pressing was applied to the pouch cells using a plate, as... Figure 1 The image shows a twisted pouch cell, and upon inspection of the interior, cracks were found in the electrode and electrolyte layers.

[0058] Figure 6 This is an image showing the appearance of a pouch cell after undergoing isostatic pressing according to an embodiment of the present invention. In contrast, for embodiments 1 and 2, where isostatic pressing is applied to the pouch cell using a pair of clamps with openings, the front of the pouch cell ( Figure 6 a) and back ( Figure 6 b) were manufactured as expected without distortion, and the internal electrode and electrolyte layers were completely free of cracks, as... Figure 6 As shown.

[0059] [Explanation of reference numerals in the attached figures]

[0060] 100: Lower clamp (h: opening, 120: groove)

[0061] 200: Pouch-type cell (210: negative electrode, 220: positive electrode, 230: electrolyte, 240: cup-shaped part, 250: sealed part, 260: pouch)

[0062] 300: Upper clamp

Claims

1. A method for manufacturing an all-solid-state battery, comprising: (a) A lower clamp is arranged, wherein an opening is formed at its center; (b) The cup-shaped portion of the bag-shaped cell is received downward into the opening of the lower clamp, and the bag-shaped cell is fixed by hanging the sealing portion on the outer periphery of the cup-shaped portion on the upper surface of the lower clamp. (c) The upper clamp, with an opening formed at its center, is fixed to the upper surface of the lower clamp, such that the openings overlap and the sealing portion of the pouch cell is compressed; and (d) While fixing the bag-shaped battery cell in the upper clamp and the lower clamp, apply isostatic pressure to the bag-shaped battery cell.

2. The method for manufacturing an all-solid-state battery as described in claim 1, wherein, The height of the opening of the lower clamp is equal to or higher than the height of the cup-shaped portion of the bag-shaped battery cell.

3. The method for manufacturing an all-solid-state battery as described in claim 1, wherein, The upper surface of the lower clamp also has a groove formed along the outer periphery of the opening.

4. The method for manufacturing an all-solid-state battery as described in claim 3, comprising: The sealing portion of the bag-shaped battery cell is positioned along the groove, and the sealing portion is secured by inserting an elastic ring into a position corresponding to the groove.

5. The method for manufacturing an all-solid-state battery as described in claim 1, wherein, The upper clamp and the lower clamp are fastened with screws.

6. The method for manufacturing an all-solid-state battery as described in claim 1, wherein, The upper clamp and the lower clamp have a porosity of less than 1%.

7. The method for manufacturing an all-solid-state battery as described in claim 6, wherein, The upper clamp and the lower clamp are each made of steel or ceramic.

8. The method for manufacturing an all-solid-state battery as described in claim 1, wherein, The bag-type battery cell includes a single-cell structure or a structure with two or more cells.

9. The method for manufacturing an all-solid-state battery as described in claim 1, wherein, The isostatic pressure is selected from the group consisting of: warm isostatic pressure, hot isostatic pressure, and cold isostatic pressure.

10. The method for manufacturing an all-solid-state battery as described in claim 1, wherein, The all-solid-state battery is a sulfide-based all-solid-state battery.

11. An apparatus for manufacturing an all-solid-state battery, comprising: The lower clamp has an opening at its center for receiving a cup-shaped portion of a pouch cell, and an upper surface of a sealing portion for supporting the pouch cell. and An upper clamp, disposed above the lower clamp, includes an opening that overlaps with an opening in the lower clamp, and a lower surface of the sealing portion for compressing the pouch cell.

12. The apparatus for manufacturing an all-solid-state battery as claimed in claim 11, wherein, A groove is further formed on the upper surface of the lower clamp along the outer periphery of the opening.

13. The apparatus for manufacturing an all-solid-state battery as described in claim 12, wherein, An elastic ring is inserted into the groove so that it is clamped between the sealing portions of the pouch cell.

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