Apparatus for pressurizing electrode body and method for pressurizing electrode body

Abstract

The present invention relates to an apparatus for pressurizing an electrode body and a method for pressurizing an electrode body and, more specifically, the apparatus comprises: a die plate including a landing portion and a peripheral portion surrounding the landing portion; a cavity structure on the peripheral portion, wherein the cavity structure includes a cavity exposing the landing portion and providing a space in which an electrode body to be subjected to a pressurization process is accommodated on the landing portion; and a punch structure on the cavity structure. The die plate includes a metal, and each of the cavity structure and the punch structure includes an elastic material.

Description

Electrode body pressurizing device and electrode body pressurizing method

[0001] The present invention relates to a pressurizing device for an electrode body and a pressurizing method for an electrode body, and more particularly, to a pressurizing device for an all-solid-state battery and a pressurizing method for an all-solid-state battery.

[0002]

[0003] Recent industrial demands have led to the active development of batteries with high energy density and safety. Recently, all-solid-state batteries, which replace the electrolyte with a solid electrolyte, have been proposed. All-solid-state batteries are made by laminating a cathode, solid electrolyte, and anode, then pressurizing and densifying them. These batteries utilize solid electrolytes instead of the electrolytes found in conventional secondary batteries. By eliminating the use of flammable organic dispersion media, all-solid-state batteries significantly reduce the risk of fire or explosion in the event of a short circuit. Consequently, these all-solid-state batteries can exhibit high safety.

[0004] All-solid-state batteries are manufactured using an isotropic pressurization method. This method suffers from low productivity due to the complex sealing and unsealing processes associated with the wet process. Consequently, interest in isotropic pressurization using a dry process is also growing in the development of all-solid-state batteries.

[0005]

[0006] The problem to be solved by the present invention is to provide a pressurizing device for an electrode body with improved process efficiency.

[0007] Another problem to be solved by the present invention is to provide a method for pressurizing an electrode body with improved process efficiency.

[0008]

[0009] According to the concept of the present invention, a pressurizing device may include a die plate including a landing portion and a peripheral portion surrounding the landing portion; a cavity structure on the peripheral portion, the cavity structure including a cavity exposing the landing portion, the cavity providing a space for accommodating an electrode body, which is a target of a pressurizing process, on the landing portion; and a punch structure on the cavity structure. The die plate may include a metal, and each of the cavity structure and the punch structure may include an elastic material.

[0010] According to another concept of the present invention, a pressurizing device may include a die plate including a plurality of die regions, the plurality of die regions being arranged along a first direction, each of the plurality of die regions including a first landing portion on an upper portion thereof; a first cavity structure provided on each of the plurality of die regions, the first cavity structure surrounding the first landing portion; a first electrode body on the first landing portion; and a first punch structure on the die plate. On each of the plurality of die regions, the first electrode body may be interposed between the first landing portion and the first punch structure.

[0011] According to another concept of the present invention, a method for pressing an electrode body may include providing an electrode body on a landing portion of a die plate; providing a cavity structure surrounding the electrode body; covering the electrode body with a punch structure to form a pressing unit; sealing the pressing unit with a dry bag body and a dry bag cover to form a dry bag unit; and performing an isostatic pressing process on the dry bag unit.

[0012]

[0013] The pressing device of the electrode body according to the present invention can substantially dry-compress the electrode body isotropically using an elastic material. This allows the compressed electrode body to be obtained simply by disassembling the pressing unit without a separate drying process. Furthermore, the pressing device according to the present invention can perform the pressing process on a large number of electrode bodies by stacking multiple electrode bodies. This can improve the productivity of the battery manufacturing process and reduce process costs.

[0014]

[0015] FIG. 1 is a plan view of an all-solid-state battery according to embodiments of the present invention.

[0016] Figure 2 is a cross-sectional view taken along line A-A' of Figure 1.

[0017] FIG. 3 is a cross-sectional view taken along line A-A' of FIG. 1 to explain an all-solid-state battery according to another embodiment of the present invention.

[0018] FIG. 4a is a perspective view showing a pressurizing unit according to one embodiment of the present invention.

[0019] Fig. 4b is a cross-sectional view taken along line A-A' of Fig. 4a.

[0020] FIG. 5a is a perspective view showing a dryback unit according to one embodiment of the present invention.

[0021] Figure 5b is a cross-sectional view taken along line A-A' of Figure 5a.

[0022] Fig. 6 is a cross-sectional view for explaining a method for pressurizing an electrode body according to one embodiment of the present invention.

[0023] Figure 7a is a perspective view for explaining a method of pressurizing an electrode body according to another embodiment of the present invention.

[0024] Fig. 7b is a cross-sectional view taken along line A-A' of Fig. 7a.

[0025] FIGS. 8A to 16 are drawings for explaining an isotropic pressing method of an electrode body according to embodiments of the present invention.

[0026]

[0027] To fully understand the structure and effects of the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and subject to various modifications. However, the description of these embodiments is provided solely to ensure a complete disclosure of the present invention and to fully inform those skilled in the art of the invention of the scope of the invention.

[0028] In this specification, when a component is referred to as being on another component, it means that it can be formed directly on the other component, or a third component may be interposed between them. Furthermore, in the drawings, the thicknesses of the components are exaggerated for the sake of clarity. Parts designated by the same reference numerals throughout the specification represent the same components.

[0029] Embodiments described herein will be described with reference to cross-sectional and / or plan views, which are ideal illustrations of the present invention. In the drawings, the thicknesses of films and regions are exaggerated for the purpose of effectively explaining the technical contents. Accordingly, the regions illustrated in the drawings have a schematic nature, and the shapes of the regions illustrated in the drawings are intended to illustrate specific shapes of regions of the device and are not intended to limit the scope of the invention. Although terms such as first, second, and third are used to describe various components in various embodiments of the present specification, these components should not be limited by such terms. These terms are used only to distinguish one component from another. The embodiments described and illustrated herein also include complementary embodiments thereof.

[0030] The terminology used herein is for the purpose of describing embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise. As used herein, the words "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components.

[0031] Unless otherwise defined herein, the particle size may be the average particle size. In addition, the particle size refers to the average particle size (D50), which means the diameter of particles with a cumulative volume of 50% by volume in a particle size distribution. The average particle size (D50) can be measured by a method well known to those skilled in the art, for example, by measuring with a particle size analyzer, or by measuring with a transmission electron microscope (TEM) photograph or a scanning electron microscope (SEM) photograph. Alternatively, the average particle size (D50) value can be obtained by measuring with a measuring device that utilizes dynamic light-scattering, performing data analysis to count the number of particles for each particle size range, and calculating from the counted number. Alternatively, the average particle size (D50) value can be obtained by measuring with a laser diffraction method. When measuring by laser diffraction, more specifically, after the particles to be measured are dispersed in a dispersion medium, they are introduced into a commercially available laser diffraction particle size measuring device (e.g., Microtrac MT 3000) and irradiated with ultrasonic waves of approximately 28 kHz at an output of 60 W, and the average particle size (D50) based on 50% of the particle size distribution in the measuring device can be calculated.

[0032]

[0033] Fig. 1 is a plan view of an all-solid-state battery according to embodiments of the present invention. Fig. 2 is a cross-sectional view taken along line A-A' of Fig. 1.

[0034] Referring to FIGS. 1 and 2, the all-solid-state battery (10) according to the present invention may include a positive electrode layer (100), a negative electrode layer (200) facing the positive electrode layer (100), and a solid electrolyte layer (300) disposed between the positive electrode layer (100) and the negative electrode layer (200). However, the present invention is not limited thereto, and the all-solid-state battery (10) may further include an additional functional layer, such as an adhesion enhancing layer, disposed between the positive electrode layer (100) and the solid electrolyte layer (300) or between the negative electrode layer (200) and the solid electrolyte layer (300).

[0035] A positive electrode layer (100) according to one embodiment of the present invention may include a positive electrode current collector (110) and a positive electrode active material layer (120) disposed on the positive electrode current collector (110). The positive electrode active material layer (120) may include a positive electrode active material, a solid electrolyte, a conductive material, and a binder.

[0036] The positive electrode current collector (110) can provide a reference surface on which the positive electrode active material layer (120) is arranged. The positive electrode current collector (110) can include a plate or foil including, for example, indium (In), copper (Cu), magnesium (Mg), stainless steel, titanium (Ti), iron (Fe), cobalt (Co), nickel (Ni), zinc (Zn), aluminum (Al), germanium (Ge), lithium (Li), or an alloy thereof.

[0037] Meanwhile, unlike that illustrated in FIG. 1, in one embodiment of the present invention, the positive electrode current collector (110) may be omitted. Although not illustrated, a carbon layer having a thickness of 0.1 μm to 4 μm may be additionally disposed between the positive electrode current collector (110) and the positive electrode active material layer (120) to increase the bonding strength between the positive electrode current collector (110) and the positive electrode active material layer (120).

[0038] The positive electrode active material of the positive electrode active material layer (120) may include a material that can reversibly absorb and desorb lithium ions. The positive electrode active material may include a plurality of particles. The positive electrode active material may include, for example, lithium transition metal oxides such as lithium cobalt oxide (LCO), lithium nickel oxide, lithium nickel cobalt oxide, lithium nickel cobalt aluminum oxide (NCA), lithium nickel cobalt manganese oxide (NCM), lithium manganate, lithium iron phosphate, nickel sulfide, copper sulfide, lithium sulfide, iron oxide, or vanadium oxide, but is not necessarily limited thereto. The positive electrode active materials may be each alone or may be a mixture of two or more types.

[0039] Lithium transition metal oxides include, for example, Li a A 1-b B b D2(0.90≤a≤1, 0≤b≤0.5), Li a E 1-b B b O 2-c D c (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05), LiE 2-b B b O 4-c D c (0≤b≤0.5, 0≤c≤0.05), Li a Ni 1-b-c Co b B c D α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α<2), Li a Ni 1-b-c Co b B c O 2-α F α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α<2), Li a Ni 1-b-cMn b B c D α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α≤2), Li a Nor 1-b-c Mn b B c O 2-α F α (0.90≤a≤1, 0≤b≤0.5, 0≤c≤0.05, 0<α<2), Li a Nor b E c G d O2(0.90≤a≤1, 0≤b≤0.9, 0≤c≤0.5, 0.001≤d≤0.1), Li a Nor b Co c Mn d GeO2(0.90≤a≤1, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0.001≤e≤0.1), Li a NiG b O2(0.9≤a≤1, 0.001≤b≤0.1), Li a CoG b O2(0.90≤a≤1, 0.001≤b≤0.1), Li a MnG b O2(0.90≤a≤1, 0.001≤b≤0.1), Li a Mn2GbO4(0.90≤a≤1, 0.001≤b≤0.1), QO2, QS2, LiQS2, V2O5, LiV2O5, LiIO2, LiNiVO4, Li 3-f J2(PO4)3(0≤f≤2), Li 3-fA compound represented by any one of Fe2(PO4)3(0≤f≤2), LiFePO4. In these compounds, the capital letter “A” is Ni, Co, Mn, or a combination thereof, the capital letter “B” is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof, the capital letter “D” is O, F, S, P, or a combination thereof, the capital letter “E” is Co, Mn, or a combination thereof, the capital letter “F” is F, S, P, or a combination thereof, the capital letter “G” is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof, the capital letter “Q” is Ti, Mo, Mn, or a combination thereof, the capital letter “I” is Cr, V, Fe, Sc, Y, or a combination thereof, and the capital letter “J” is V, Cr, Mn, Co, Ni, Cu, or a combination thereof.

[0040] The cathode active material may include, for example, a lithium salt of a transition metal oxide having a layered rock salt type structure among the lithium transition metal oxides described above. The "layered rock salt type structure" is, for example, a cubic rock salt type structure. <111> It is a structure in which oxygen atomic layers and metal atomic layers are alternately and regularly arranged in a direction, and thereby each atomic layer forms a two-dimensional plane. The "cubic rock salt structure" refers to the sodium chloride type (NaCl type) structure, which is a type of crystal structure, and specifically refers to a structure in which the face-centered cubic lattice (fcc) formed by each cation and anion is arranged with a displacement of half of the ridge of the unit lattice. Lithium transition metal oxides having this layered rock salt structure include, for example, LiNi x Co y Al z O2(NCA) or LiNi x Co y Mn zO2(NCM) (0 <x<1,0<y<1, 0<z<1, x+y+z=1) 등의 삼원계 리튬전이금속산화물일 수 있다. 양극 활물질이 층상암염형 구조를 갖는 삼원계 리튬전이금속산화물을 포함하는 경우, 전고체 전지(10)의 에너지 밀도가 커지고 열안정성이 향상될 수 있다.

[0041] The above-described compound included in the positive electrode active material may be covered by a coating layer (not shown). The positive electrode active material may also be a mixture of the above-described compound and a compound to which a coating layer is added. Meanwhile, the coating layer added to the surface of the positive electrode active material may include, for example, an oxide, a hydroxide, an oxyhydroxide, an oxycarbonate, or a hydroxycarbonate of the coating elements below. The compound forming the coating layer is amorphous or crystalline. The coating elements included in the coating layer may include Mg, Al, Co, K, Na, Ca, Si, Ti, V, Sn, Ge, Ga, B, As, Zr, or mixtures thereof. The coating layer may include, for example, Li2O-ZrO2 (LZO). The method for forming the coating layer is selected within a range that does not adversely affect the physical properties of the positive electrode active material. The method for forming the coating layer includes, for example, spray coating, dipping, etc.

[0042] When the positive electrode active material includes nickel (Ni) as a ternary lithium transition metal oxide such as NCA or NCM, for example, the capacity density of the all-solid-state battery (10) can be increased, thereby reducing metal dissolution of the positive electrode active material in a charged state. As a result, the cycle characteristics of the all-solid-state battery (10) in a charged state are improved. Meanwhile, the "cycle characteristics" are characteristics indicating the degree to which the all-solid-state battery (10) is deteriorated by charge / discharge of the all-solid-state battery (10). An all-solid-state battery (10) with high cycle characteristics may have a small degree of deterioration of the all-solid-state battery (10) due to charge / discharge, and an all-solid-state battery (10) with low cycle characteristics may have a large degree of deterioration of the all-solid-state battery (10) due to charge / discharge.

[0043] The positive electrode active material may have a particle shape such as a sphere or an ellipsoid, for example. The particle size and content of the positive electrode active material are not particularly limited.

[0044] The solid electrolyte of the positive electrode active material layer (120) may have a particle shape. The solid electrolyte may be dispersed between the positive electrode active materials. The solid electrolyte may include a sulfide-based solid electrolyte having excellent lithium ion conductivity characteristics. Examples of the sulfide-based solid electrolyte include Li2S-P2S5, Li2S-P2S5-LiX (X is a halogen element), Li2S-P2S5-Li2O, Li2S-P2S5-Li2O-LiI, Li2S-SiS2, Li2S-SiS2-LiI, Li2S-SiS2-LiBr, Li2S-SiS2-LiCl, Li2S-SiS2-B2S3-LiI, Li2S-SiS2-P2S5-LiI, Li2S-B2S3, Li2S-P2S5-Z m S n (m, n are positive numbers, capital letter “Z” represents Ge, Zn or Ga), Li2S-GeS2, Li2S-SiS2-Li3PO4, Li2S-SiS2-Li p MO q (p, q are positive numbers, capital letter “M” is one of P, Si, Ge, B, Al, Ga In), Li 7-x PS 6-x Cl x (0≤x≤2), Li 7-x PS 6-x Br x (0≤x≤2), and Li 7-x PS 6-x I x It may include at least one selected from (0≤x≤2).

[0045] Sulfide-based solid electrolytes include, for example, Li 7-x PS 6-x Cl x (0≤x≤2), Li 7-x PS 6-x Br x (0≤x≤2), and Li 7-xPS 6-x I x It may be an argyrodite-type compound including at least one selected from (0≤x≤2). In particular, the sulfide-based solid electrolyte may be an argyrodite-type compound including at least one selected from Li6PS5Cl, Li6PS5Br, and Li6PS5I.

[0046] Alternatively, the sulfide-based solid electrolyte is Li 7-a M a PS 6-c X c It may be an argyrodite-type compound containing (0≤a≤2, (0≤c≤2)), where X may be F, Br, Cl, or a combination thereof. M is candium (Sc), yttrium (Y), titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), manganese (Mn), technetium (Tc), rhenium (Re), iron (Fe), ruthenium (Ru), osmium (Os), cobalt (Co), rhodium (Rh), iridium (Ir), nickel (Ni), palladium (Pd), platinum (Pt), copper (Cu), silver (Ag), gold (Au), zinc (Zn), cadmium (Cd), mercury (Hg), aluminum (Al), gallium (Ga), indium (In), thallium (Tl), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), arsenic (As), antimony (Sb), bismuth (Bi), or a combination thereof. Can be.

[0047] The density of the argyrodite-type solid electrolyte may be 1.5 g / cc to 2.0 g / cc. Since the argyrodite-type solid electrolyte has a density of 1.5 g / cc or more, the internal resistance of the all-solid-state battery is reduced, and the defect of the solid electrolyte membrane being penetrated and short-circuited due to the formation of lithium dendrites can be prevented. The elastic modulus of the solid electrolyte may be, for example, 15 GPa to 35 GPa.

[0048] The solid electrolyte in the positive electrode active material layer (120) may have a smaller average particle diameter than the first and second solid electrolytes in the solid electrolyte layer (300) described later. For example, the average particle diameter of the solid electrolyte in the positive electrode active material layer (120) may be 90% or less, 80% or less, 70% or less, 60% or less, 50% or less, 40% or less, 30% or less, or 20% or less of the average particle diameter of the solid electrolyte in the solid electrolyte layer (300). Meanwhile, the average particle diameter may be a median diameter measured using a laser particle size distribution meter.

[0049] The positive electrode active material layer (120) may include a conductive material. The conductive material may have conductivity without causing a chemical change in the all-solid-state battery (10), thereby increasing the conductivity of the positive electrode active material and the solid electrolyte. The conductive material may include a carbon-based material. The conductive material may include, for example, one or more selected from graphite, carbon black, acetylene black, carbon nanofibers, and carbon nanotubes.

[0050] The positive electrode active material layer (120) may further include a binder. The binder may bind the positive electrode active material, the solid electrolyte, and the conductive material within the positive electrode active material layer (120) to each other. The binder may include a material for improving the bonding strength between the positive electrode active material layer (120) and the positive electrode current collector (110). The binder may include, for example, polyvinylidene fluoride, styrene butadiene rubber (SBR), polytetrafluoroethylene, polyvinylidene fluoride, vinylidene fluoride / hexafluoropropylene copolymer, polyacrylonitrile, and polymethyl methacrylate.

[0051] Based on 100 parts by weight of the total of the positive electrode active material, the solid electrolyte, the conductive material, and the binder, the positive electrode active material layer (120) may include 85 parts by weight or more and 92 parts by weight or less of the positive electrode active material. Based on 100 parts by weight of the total of the positive electrode active material, the solid electrolyte, the conductive material, and the binder, the positive electrode active material layer (120) may include 0.5 parts by weight or more and 1.5 parts by weight or less of the binder.

[0052] Based on 100 parts by weight of the solid electrolyte, the positive electrode active material layer (120) may include 1 part by weight or more and 50 parts by weight or less of a conductive material. If the conductive material is included in the positive electrode active material layer (120) in an amount of less than 1 part by weight based on 100 parts by weight of the solid electrolyte, the proportion of the conductive material may decrease, thereby lowering the electrical conductivity of the positive electrode active material layer (120). If the conductive material is included in the positive electrode active material layer (120) in an amount of more than 50 parts by weight based on 100 parts by weight of the solid electrolyte, the proportion of the conductive material may be excessively high, so that a covering layer covering the surface of the solid electrolyte may not be properly formed.

[0053] The positive electrode active material layer (120) may further include additives such as fillers, coating agents, dispersants, and ion conductive aids in addition to the above-described positive electrode active material, solid electrolyte, conductive agent, and binder.

[0054] The negative electrode layer (200) may include a negative electrode current collector (210) and a negative electrode coating layer (220) on the negative electrode current collector (210). The negative electrode current collector (210) may provide a reference surface on which the negative electrode coating layer (220) is disposed. The negative electrode current collector (210) may include, for example, a material that does not react with lithium, i.e., does not form an alloy or a compound with lithium. For example, the negative electrode current collector (210) may include at least one metal selected from the group consisting of copper (Cu), stainless steel, titanium (Ti), iron (Fe), cobalt (Co), and nickel (Ni). The thickness of the negative electrode current collector (210) may be 1 μm to 20 μm, more specifically 5 μm to 15 μm, and more specifically 7 μm to 10 μm.

[0055] The negative electrode current collector (210) may be composed of one of the above-described metals, or may include an alloy or coating material of two or more metals. The negative electrode current collector (210) may have, for example, a plate shape or a foil shape. Meanwhile, in one embodiment, the negative electrode current collector (210) may be omitted.

[0056] The negative electrode coating layer (220) can allow lithium metal to grow between it and the negative electrode current collector (210) when the all-solid-state battery (10) is charged. The negative electrode coating layer (220) can act as a protective layer for the lithium metal and simultaneously suppress the precipitation and growth of lithium dendrites.

[0057] The cathode coating layer (220) may include a metal and carbon. For example, the cathode coating layer (220) may include at least one metal selected from the group consisting of gold (Au), platinum (Pt), palladium (Pd), silicon (Si), silver (Ag), aluminum (Al), bismuth (Bi), tin (Sn), and zinc (Zn). The cathode coating layer (220) may include at least one carbon selected from the group consisting of carbon black, acetylene black, furnace black, ketjen black, and graphene. In one embodiment, the cathode coating layer (220) may include a mixture of carbon black and silver (Ag).

[0058] The cathode coating layer (220) may further include additives other than metal and carbon. The cathode coating layer (220) may further include, for example, at least one additive selected from the group consisting of a binder, a filler, a coating agent, a dispersant, and an ion conductive additive.

[0059] The negative electrode coating layer (220) may have a smaller thickness than the positive electrode active material layer (120). The thickness of the negative electrode coating layer (220) may be, for example, 50% or less, 40% or less, 30% or less, 20% or less, 10% or less, or 5% or less of the thickness of the positive electrode active material layer (120). The thickness of the negative electrode coating layer (220) may be, for example, 1 um to 20 um, 2 um to 10 um, or 3 um to 7 um. If the thickness of the negative electrode coating layer (220) is too thin, lithium dendrites formed between the negative electrode coating layer (220) and the negative electrode current collector (210) may cause the negative electrode coating layer (220) to collapse, thereby deteriorating the cycle characteristics of the all-solid-state battery (10). If the thickness of the cathode coating layer (220) increases excessively, the energy density of the all-solid-state battery (10) may decrease and the internal resistance of the all-solid-state battery (10) due to the cathode coating layer (220) may increase, thereby deteriorating the cycle characteristics of the cell.

[0060] Meanwhile, although not shown, a carbon layer may be further included to improve adhesion between the cathode coating layer (220) and the solid electrolyte layer (300).

[0061] A solid electrolyte layer (300) may be provided between the positive electrode layer (100) and the negative electrode layer (200). The solid electrolyte layer (300) may include a sulfide-based solid electrolyte having excellent lithium ion conductivity characteristics. The solid electrolyte in the solid electrolyte layer (300) may be the same as or different from any one of the materials included in the solid electrolyte in the positive electrode active material layer (120) described above.

[0062] The solid electrolyte layer (300) may include a first solid electrolyte layer (310) and a second solid electrolyte layer (320). The first solid electrolyte layer (310) may be adjacent to the positive electrode layer (100), and the second solid electrolyte layer (320) may be adjacent to the negative electrode layer (200).

[0063] Referring to FIG. 2, the first solid electrolyte layer (310) may include a first solid electrolyte. The first solid electrolyte may have a particle shape such as a sphere or an ellipsoid. The first solid electrolyte may include a sulfide-based solid electrolyte. The first solid electrolyte may be amorphous, crystalline, or a mixture thereof. In addition, the solid electrolyte may include, for example, at least sulfur (S), phosphorus (P), and lithium (Li) as constituent elements among the above-described sulfide-based solid electrolyte materials. For example, the solid electrolyte may be a material including Li2S-P2S5. When using a sulfide-based solid electrolyte material including Li2S-P2S5 to form the solid electrolyte, the mixing molar ratio of Li2S and P2S5 is, for example, in the range of Li2S:P2S5=50:50 to 90:10.

[0064] In one embodiment, the first solid electrolyte is Li 7-x PS 6-x Clx (0≤x≤2), Li 7-x PS 6-x Br x (0≤x≤2), and Li 7-x PS 6-x I x The first solid electrolyte may include an argyrodite-type compound including at least one selected from (0≤x≤2). The first solid electrolyte may include an argyrodite-type compound including at least one selected from Li6PS5Cl, Li6PS5Br, and Li6PS5I.

[0065] In another embodiment, the first solid electrolyte is Li 7-a M a PS 6-c X c It may include an argyrodite-type compound including X, wherein X may be Cl, Br, or a combination thereof. M may be Na, K, Fe, Mg, Ca, Ag, Cu, Zr, Zn, or a combination thereof. Each of a and c may be a real number between 0 and 2.

[0066] The density of the argyrodite-type solid electrolyte may be 1.5 g / cc to 2.0 g / cc. When the argyrodite-type solid electrolyte has a density of 1.5 g / cc or more, the internal resistance of the all-solid-state battery is reduced, and the defect of the solid electrolyte membrane being penetrated and short-circuited due to the formation of lithium dendrites can be prevented. The elastic modulus of the first solid electrolyte is, for example, 15 GPa to 35 GPa.

[0067] The first solid electrolyte layer (310) may further include a binder. The binder included in the solid electrolyte layer (300) may be, for example, styrene butadiene rubber (SBR), polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, etc., but is not limited thereto. The binder of the first solid electrolyte layer (310) may be the same as or different from the binder included in the positive electrode active material layer (120) or the binder included in the negative electrode coating layer (220).

[0068] The second solid electrolyte layer (320) may include a second solid electrolyte. The second solid electrolyte may have a particle shape such as a sphere or ellipsoid.

[0069] The second solid electrolyte may include a sulfide-based solid electrolyte. The description of the second solid electrolyte may be the same as or similar to that described above for the first solid electrolyte. In one embodiment, the second solid electrolyte may have substantially the same composition as the first solid electrolyte. In another embodiment, the second solid electrolyte may have a similar composition to the first solid electrolyte.

[0070] The second solid electrolyte can be in direct contact with the negative electrode coating layer (220). As a result, the second solid electrolyte can suppress lithium dendrites formed between the negative electrode coating layer (220) and the negative electrode current collector (210). The second solid electrolyte can effectively suppress negative electrode side reactions. As a result, the cell performance of the all-solid-state battery (10) according to the present invention can be improved.

[0071] The first solid electrolyte layer (310) may have a first thickness (TK1), and the second solid electrolyte layer (320) may have a second thickness (TK2). The first thickness (TK1) and the second thickness (TK2) may be the same or different. In one embodiment, the first thickness (TK1) may be greater than the second thickness (TK2). For example, the first thickness (TK1) may be 1.1 to 5 times the second thickness (TK2).

[0072] Referring back to FIGS. 1 and 2, the positive electrode layer (100) and the first solid electrolyte layer (310) may form a positive electrode composite layer (CSH). The negative electrode layer (200) and the second solid electrolyte layer (320) may form a negative electrode composite layer (ASH). The positive electrode composite layer (CSH) may be laminated on the negative electrode composite layer (ASH).

[0073] The area of ​​the cathode composite layer (ASH) and the area of ​​the cathode composite layer (CSH) may be different. Specifically, the area of ​​the cathode composite layer (ASH) may be larger than that of the cathode composite layer (CSH). The cathode composite layer (CSH) may be completely overlapped within the cathode composite layer (ASH).

[0074] In one embodiment of the present invention, the first solid electrolyte layer (310) may have substantially the same area as the positive electrode layer (100). The second solid electrolyte layer (320) may have substantially the same area as the negative electrode layer (200).

[0075] Specifically, the positive electrode composite layer (CSH) may have a first width (WI1) in a first direction (D1). The negative electrode composite layer (ASH) may have a second width (WI2) in the first direction (D1). The first width (WI1) may be smaller than the second width (WI2). The positive electrode composite layer (CSH) may have a third width (WI3) in the second direction (D2). The negative electrode composite layer (ASH) may have a fourth width (WI4) in the second direction (D2). The third width (WI3) may be smaller than the fourth width (WI4).

[0076] The all-solid-state battery (10) according to the present embodiment can be manufactured by forming a negative electrode composite layer (ASH) on a first carrier film, forming a positive electrode composite layer (CSH) on a second carrier film, and then laminating the negative electrode composite layer (ASH) and the positive electrode composite layer (CSH).

[0077] FIG. 3 is a cross-sectional view taken along line A-A' of FIG. 1, illustrating an all-solid-state battery according to another embodiment of the present invention. In the embodiments described below, detailed descriptions of technical features overlapping with those previously described with reference to FIGS. 1 and 2 will be omitted, and differences will be described in detail.

[0078] Referring to FIG. 3, the all-solid-state battery (10) according to the present invention may further include a gasket (GSK). The gasket (GSK) may be provided to surround the cathode composite layer (CSH). The gasket (GSK) may fill the step on the side of the all-solid-state battery (10) caused by the difference in area between the anode composite layer (ASH) and the cathode composite layer (CSH). The gasket (GSK) may surround the four side surfaces of the cathode composite layer (CSH). For example, the thickness of the gasket (GSK) may be substantially the same as the thickness of the cathode composite layer (CSH).

[0079] The upper surface of the second solid electrolyte layer (320) may include a first region in contact with the first solid electrolyte layer (310) and a second region in contact with the gasket (GSK). The second region may be a peripheral region of the upper surface of the second solid electrolyte layer (320). The second region may surround the first region.

[0080]

[0081] Fig. 4a is a perspective view showing a pressurizing unit according to one embodiment of the present invention. Fig. 4b is a cross-sectional view taken along line A-A' of Fig. 4a.

[0082] Hereinafter, the all-solid-state battery (10) described with reference to FIGS. 1 to 3 above is referred to as an electrode structure (10). The electrode structure (10) may include not only the electrode plates constituting the all-solid-state battery described above, but also a laminated structure including at least one electrode plate. In other words, the electrode structure (10) may collectively refer to electrode plates that require densification through a high-pressure pressurization process.

[0083] Referring to FIGS. 4A and 4B, a die plate (DPL) may be provided. The die plate (DPL) may have a rectangular plate shape. The die plate (DPL) may include a periphery (PER) and a landing portion (LDP) protruding at the center thereof. The landing portion (LDP) may be an area protruding in a third direction (D3) from the upper surface of the die plate (DPL). The periphery (PER) may surround the periphery of the landing portion (LDP).

[0084] The landing portion (LDP) may be positioned higher than the periphery (PER). In other words, the upper surface of the landing portion (LDP) may be higher than the upper surface of the periphery (PER). The landing portion (LDP) may be configured so that an electrode body (10), which will be described later, can be mounted thereon. From a planar perspective, the landing portion (LDP) may have a shape that vertically overlaps the electrode body (10), which will be described later.

[0085] The die plate (DPL) can serve as a substrate for supporting the electrode body (10) to be described later. The die plate (DPL) can be configured to stably support the electrode body (10) to be described later even under high pressure. The die plate (DPL) can include a metal having sufficient rigidity to prevent bending and twisting of the electrode body (10) when a pressurizing process is performed on the electrode body (10). For example, the die plate (DPL) can include a hard metal such as SUS (Steel Use Stainless).

[0086] A cavity structure (RCV) may be provided on the periphery (PER) of the die plate (DPL). The cavity structure (RCV) may vertically overlap the periphery (PER). The cavity structure (RCV) may include a cavity (CAV) penetrating through its center. The cavity (CAV) may vertically overlap the landing portion (LDP).

[0087] The cavity structure (RCV) can be in direct contact with the periphery (PER). The landing portion (LDP) can be exposed through the cavity (CAV) of the cavity structure (RCV). In other words, the cavity structure (RCV) may not contact the upper surface (TS1) of the landing portion (LDP). The cavity structure (RCV) can selectively cover only the side walls of the landing portion (LDP).

[0088] An electrode body (10) may be provided on a landing portion (LDP) of a die plate (DPL). In one embodiment, the electrode body (10) may include the negative electrode composite layer (ASH) and the positive electrode composite layer (CSH) described above (see FIG. 2). The negative electrode composite layer (ASH) and the positive electrode composite layer (CSH) may be laminated. The electrode body (10) may be provided on the landing portion (LDP) and inserted into the cavity (CAV) at the same time.

[0089] The bottom surface (BS1) of the electrode body (10) can be in direct contact with the upper surface (TS1) of the landing portion (LDP). The upper surface (TS2) of the electrode body (10) can be coplanar with the upper surface (TS3) of the cavity structure (RCV). In other words, the upper surface (TS2) of the electrode body (10) and the upper surface (TS3) of the cavity structure (RCV) can be positioned at substantially the same level.

[0090] A fixing film (FFL) may be provided on the upper surface (TS2) of the electrode body (10) and the upper surface (TS3) of the cavity structure (RCV). The fixing film (FFL) may directly cover the upper surface (TS2) of the electrode body (10) and the upper surface (TS3) of the cavity structure (RCV). The fixing film (FFL) may fix the electrode body (10) so that it does not come off.

[0091] The fixing film (FFL) may be a film that fixes the electrode body (10) on the die plate (DPL). The fixing film (FFL) may be fixed to the die plate (DPL) by a laminating method or the like. For example, the fixing film (FFL) may include a polymer material such as PE.

[0092] A punch structure (RPC) may be provided on a fixed film (FFL). The fixed film (FFL) may be configured to fix the position of the punch structure (RPC). The punch structure (RPC) may be configured to compress the electrode body (10). In one embodiment, the punch structure (RPC) may comprise substantially the same material as the cavity structure (RCV).

[0093] As described above, the die plate (DPL), the cavity structure (RCV), the electrode body (10), the fixed film (FFL), and the punch structure (RPC) can be sequentially laminated. The laminated die plate (DPL), the cavity structure (RCV), the electrode body (10), the fixed film (FFL), and the punch structure (RPC) can form a pressurizing unit (PSU).

[0094] Each of the cavity structure (RCV) and the punch structure (RPC) may include an elastic material such as rubber. Each of the cavity structure (RCV) and the punch structure (RPC) may be composed of an elastic material. The elastic material may include at least one selected from the group consisting of urethane rubber, nitrile rubber, butyl rubber, fluoroelastomer, chloroprene rubber, ethylene rubber, and silicone rubber. The cavity structure (RCV) and the punch structure (RPC) may include the same or different elastic materials.

[0095] The pressurizing unit (PSU) according to the present invention can be configured to uniformly pressurize the electrode body (10) inside thereof through pressure applied from the outside. The cavity structure (RCV) and the punch structure (RPC) can be composed of an elastic material suitable for uniformly pressing the electrode body (10). More specifically, the elastic material can have a hardness and mechanical strength (e.g., tensile strength) suitable for the pressing process. For example, the hardness (Shore A) of the elastic material can be 30 to 90. The tensile strength of the elastic material can be 1 MPa to 50 MPa, or 10 MPa to 50 MPa.

[0096] Fig. 5a is a perspective view showing a dry bag unit according to one embodiment of the present invention. Fig. 5b is a cross-sectional view taken along line A-A' of Fig. 5a. Referring to Figs. 5a and 5b, a dry bag body (DBB) may be provided. In the present embodiment, the dry bag body (DBB) has a disk shape, but is not particularly limited in shape. The dry bag body (DBB) may include a recessed region (RSR) capable of accommodating at least one pressurization unit (PSU). The recessed region (RSR) may be a recessed region extending from the upper surface of the dry bag body (DBB) toward its bottom surface. The recessed region (RSR) may have a shape that vertically overlaps the pressurization unit (PSU).

[0097] The pressurization units (PSU) described above with reference to FIGS. 4A and 4B may be provided in multiple numbers. In one embodiment, first to fourth pressurization units (PSU1 to PSU4) may be provided. The first to fourth pressurization units (PSU1 to PSU4) may be sequentially stacked to form a stacked structure (SST). The stacked structure (SST) may be accommodated within a recessed region (RSR) of a dry bag body (DBB).

[0098] The bottom surface (SST_B) of the laminated structure (SST) may be in contact with the bottom of the recessed region (RSR). The side wall (SST_S) of the laminated structure (SST) may be in contact with the inner surface of the recessed region (RSR). In one embodiment, the top surface (SST_T) of the laminated structure (SST) may be lower than the top surface of the dry bag body (DBB).

[0099] A dry bag cover (DBC) may be provided on a dry bag body (DBB) containing a laminated structure (SST). The dry bag cover (DBC) may seal the laminated structure (SST). The dry bag cover (DBC) may include a protrusion (PRP) at its center.

[0100] In one embodiment, the protrusion (PRP) may have a shape that vertically overlaps the recessed region (RSR). The protrusion (PRP) may be configured to fit over the upper portion of the recessed region (RSR). The bottom surface of the protrusion (PRP) may be in direct contact with the upper surface (SST_T) of the laminated structure (SST).

[0101] Each of the dry bag body (DBB) and the dry bag cover (DBC) may include an elastic material such as rubber. Each of the dry bag body (DBB) and the dry bag cover (DBC) may be composed of an elastic material. The elastic material may include at least one selected from the group consisting of urethane rubber, nitrile rubber, butyl rubber, fluoroelastomer, chloroprene rubber, ethylene rubber, and silicone rubber. The dry bag body (DBB) and the dry bag cover (DBC) may include the same or different elastic materials.

[0102] The elastic material of each of the dry bag body (DBB) and the dry bag cover (DBC) may have a hardness and mechanical strength (e.g., tensile strength) suitable for the pressurization process. For example, the hardness (Shore A) of the elastic material may be 30 to 90. The tensile strength of the elastic material may be 1 MPa to 50 MPa, or 10 MPa to 50 MPa.

[0103] A dry bag body (DBB), a laminated structure (SST), and a dry bag cover (DBC) can constitute a dry bag unit (DBU). The dry bag unit (DBU) according to the present invention can be configured to uniformly pressurize the laminated structure (SST) inside thereof through pressure applied from the outside. Since the dry bag body (DBB) and the dry bag cover (DBC) include an elastic material having a hardness and mechanical strength suitable for the pressurization process as described above, the dry bag unit (DBU) can uniformly apply pressure to the laminated structure (SST).

[0104] In one embodiment of the present invention, the dry bag body (DBB) and the dry bag cover (DBC) may include a first elastic material, and the cavity structure (RCV) and the punch structure (RPC) may include a second elastic material. The physical properties of the first elastic material may be different from the physical properties of the second elastic material. The hardness of the first elastic material may be greater than the hardness of the second elastic material. The tensile strength of the first elastic material may be greater than the tensile strength of the second elastic material. Since the second elastic material is in direct contact with the electrode body (10), it should have softer properties than the first elastic material so as to be advantageous for isotropic pressing of the electrode body (10) while minimizing damage to the electrode body (10). For example, the first elastic material may be urethane rubber, and the second elastic material may be silicone rubber.

[0105] Fig. 6 is a cross-sectional view illustrating a dry pressing method of an electrode body according to one embodiment of the present invention. Referring to Fig. 6, an electrode body can be isotropically pressed using a dry pressing device that utilizes a pressurizing medium.

[0106] Specifically, a dry bag unit (DBU) described above with reference to FIGS. 5A and 5B may be provided within a vessel (VSS). The vessel (VSS) may include a pressure vessel. A pressurized medium (PMD) may be provided between the vessel (VSS) and the dry bag unit (DBU). The pressurized medium (PMD) may be filled in the space between the vessel (VSS) and the dry bag unit (DBU). For example, the pressurized medium (PMD) may be water.

[0107] The internal pressure of the vessel (VSS) can be increased. By increasing the internal pressure of the vessel (VSS), the pressurized medium (PMD) can isotropically pressurize the dry bag unit (DBU). In other words, the pressurized medium (PMD) can apply external pressure to the dry bag unit (DBU).

[0108] As described above, the dry back unit (DBU) can isotropically pressurize its internal laminated structure (SST) using the external pressure. At least one electrode body (10) inside the laminated structure (SST) can be uniformly pressurized.

[0109] In one embodiment, the electrode body (10) may include an anode composite layer (ASH) and a cathode composite layer (CSH) of an all-solid-state battery. An isotropic pressure may be applied to the electrode body (10) by a punch structure (RPC) and a die plate (DPL) (see FIG. 4b). As a result, the first solid electrolyte layer (310) of the anode composite layer (CSH) and the second solid electrolyte layer (320) of the cathode composite layer (ASH) may be strongly bonded to each other, so that the first and second solid electrolyte layers (310, 320) may form a single dense solid electrolyte layer (see FIG. 2). By the pressure applied to the electrode body (10), micropores within the first and second solid electrolyte layers (310, 320) may be removed, and the interface characteristics between the first and second solid electrolyte layers (310, 320) may be improved.

[0110] After the pressurization process for the laminated structure (SST) is performed, the dry bag unit (DBU) can be discharged from the vessel (VSS). The dry bag cover (DBC) of the dry bag unit (DBU) can be removed to separate the laminated structure (SST) from the dry bag unit (DBU). The process of withdrawing the laminated structure (SST) can be performed dry.

[0111] The dry bag unit (DBU) can completely seal the laminated structure (SST) so that a pressurized medium (PMD) (e.g., water) does not flow into the laminated structure (SST). As a result, wet isostatic pressing (WIP) is performed on the dry bag unit (DBU), but dry isostatic pressing (DIP) can be performed on the laminated structure (SST) inside the dry bag unit (DBU). Since the electrode body (10) inside the laminated structure (SST) is substantially pressurized by surrounding elastic materials (e.g., rubber), isostatic pressing can be efficiently performed even without a pouch.

[0112] In embodiments of the present invention, isotropic pressing of the electrode body may include wet pressing or dry pressing. When isotropic pressing is performed in a wet manner based on the pressurized body to be isotropically pressed, it may be defined as a wet pressing process. When isotropic pressing is performed in a dry manner based on the pressurized body, it may be defined as a dry pressing process.

[0113] Fig. 7a is a perspective view illustrating a wet pressurization method of an electrode body according to another embodiment of the present invention. Fig. 7b is a cross-sectional view taken along line A-A' of Fig. 7a. Referring to Figs. 7a and 7b, a plurality of pressurization units (PSUs) described above with reference to Figs. 4a and 4b may be provided. In one embodiment, first to fourth pressurization units (PSU1 to PSU4) may be provided. The first to fourth pressurization units (PSU1 to PSU4) may be sequentially stacked to form a stacked structure (SST).

[0114] A pouch (PUC) sealing a laminated structure (SST) may be provided. The laminated structure (SST) and the pouch (PUC) may form a pouch unit (PCU). The pouch unit (PCU) may be accommodated in the wet pressurization device described above with reference to FIG. 6.

[0115] Specifically, a pouch unit (PCU) may be provided within a vessel (VSS). An isotropic pressurization process may be performed on the pouch unit (PCU) via a pressurized medium (PMD) filling the vessel (VSS). As a result, at least one electrode body (10) within the laminated structure (SST) may be uniformly pressurized.

[0116] In the isotropic pressurization method according to the present embodiment, a pouch (PUC) can be used instead of the dry bag (DBB, DBC) of the isotropic pressurization method described above with reference to FIGS. 5a, 5b, and 6. According to the present embodiment, since the electrode body (10) is not directly sealed with the pouch (PUC), but the laminated structure (SST) is sealed, the dismantling process of the pouch (PUC) after the sealing and pressurization process of the pouch (PUC) can be simplified. In addition, since the electrode body (10) is pressed by the punch structure (RPC) and the die plate (DPL), an isotropic pressure can be smoothly applied to the electrode body (10) (see FIG. 4b).

[0117]

[0118] FIGS. 8A to 16 are drawings for explaining an isotropic pressing method of an electrode body according to embodiments of the present invention. In the embodiments described below, detailed descriptions of technical features that overlap with those previously explained with reference to FIGS. 4A to 6 will be omitted, and differences will be described in detail.

[0119] Referring to FIGS. 8a and 8b, a die plate (DPL) capable of mounting a plurality of electrode bodies (10) may be provided. The die plate (DPL) may have a bar shape extending in a first direction (D1).

[0120] A die plate (DPL) may include a plurality of die regions (DIR). The plurality of die regions (DIR) may be arranged along a first direction (D1). Each die region (DIR) may correspond to the die plate (DPL) described above with reference to FIGS. 4A and 4B.

[0121] Each of the die regions (DIR) may include a first landing portion (LDP1) and a second landing portion (LDP2). The first landing portion (LDP1) may be provided on an upper portion of the die region (DIR). The second landing portion (LDP2) may be provided on a lower portion of the die region (DIR). The first landing portion (LDP1) and the second landing portion (LDP2) may vertically overlap each other. The first landing portion (LDP1) and the second landing portion (LDP2) may face each other in a third direction (D3). Each of the first and second landing portions (LDP1, LDP2) may be configured such that an electrode body (10) may be mounted thereon.

[0122] A first cavity structure (RCV1) and a second cavity structure (RCV2) may be provided on each die region (DIR). The first cavity structure (RCV1) may be provided above the die region (DIR) and may surround the first landing portion (LDP1). The second cavity structure (RCV2) may be provided below the die region (DIR) and may surround the second landing portion (LDP2).

[0123] First cavity structures (RCV1) on adjacent die regions (DIR) can be in contact with each other by interlocking. Second cavity structures (RCV2) on adjacent die regions (DIR) can be in contact with each other by interlocking.

[0124] Referring to FIGS. 9A and 9B, a pair of electrode bodies (10) may be provided on each die region (DIR). In one embodiment, each of the electrode bodies (10) may include a cathode composite layer (ASH) and a cathode composite layer (CSH).

[0125] One of the pair of electrode bodies (10) may be mounted on a first landing portion (LDP1), and the other of the pair of electrode bodies (10) may be mounted on a second landing portion (LDP2). The electrode body (10) on the first landing portion (LDP1) may be surrounded by a first cavity structure (RCV1). The electrode body (10) on the second landing portion (LDP2) may be surrounded by a second cavity structure (RCV2).

[0126] A first fixing film (FFL1) may be provided on the die plate (DPL). The first fixing film (FFL1) may cover the electrode bodies (10) on the first landing portions (LDP1). A second fixing film (FFL2) may be provided under the die plate (DPL). The second fixing film (FFL2) may cover the electrode bodies (10) on the second landing portions (LDP2).

[0127] Referring to FIGS. 10A and 10B, a first punch structure (RPC1) may be provided on a first fixed film (FFL1). A second punch structure (RPC2) may be provided on a second fixed film (FFL2). A die plate (DPL) may be interposed between the first and second punch structures (RPC1, RPC2). Within each die region (DIR), one of the pair of electrode bodies (10) may be interposed between the first punch structure (RPC1) and the first landing portion (LDP1). The other of the pair of electrode bodies (10) may be interposed between the second punch structure (RPC2) and the second landing portion (LDP2).

[0128] According to the present embodiment, the die plate (DPL), first and second cavity structures (RCV1, RCV2), electrode bodies (10), first and second fixing films (FFL1, FFL2), and first and second punch structures (RPC1, RPC2) can constitute a pressurizing unit (PSU). Since the pressurizing unit (PSU) according to the present embodiment accommodates a plurality of electrode bodies (10) rather than one electrode body (10), the process efficiency of the pressurizing process can be improved.

[0129] In another embodiment of the present invention, the second punch structure (RPC2) may be omitted. This is because, as described below, a plurality of pressurizing units (PSUs) are stacked, and thus at least one punch structure (e.g., RPC1) may be interposed between vertically adjacent pressurizing units (PSUs).

[0130] Fig. 11a is a perspective view illustrating a dry bag unit according to the present embodiment, and Fig. 11b is a perspective view illustrating a laminated structure according to the present embodiment. Referring to Fig. 11a, a transfer basket (TFB) may be provided. A first laminated structure (SST1), a second laminated structure (SST2), and a third laminated structure (SST3) may be provided on the transfer basket (TFB). In one embodiment, the first to third laminated structures (SST1-SST3) may be arranged in a cross shape.

[0131] The transport basket (TFB) may be configured to load the first to third stacked structures (SST1 to SST3). The transport basket (TFB) may support the first to third stacked structures (SST1 to SST3). In one embodiment, the transport basket (TFB) may be configured to have sufficient strength to support and transport the first to third stacked structures (SST1 to SST3). For example, the transport basket (TFB) may include a metal such as stainless steel.

[0132] Referring to FIG. 11b, for example, the first laminated structure (SST1) may include a plurality of pressurization units (PSU) stacked along the third direction (D3). The stacked pressurization units (PSU) may constitute the first laminated structure (SST1). The second laminated structure (SST2) and the third laminated structure (SST3) may also each include stacked pressurization units (PSU).

[0133] The number of pressurization units (PSU) constituting the first laminated structure (SST1) may be greater than the number of pressurization units (PSU) constituting the second laminated structure (SST2). The number of pressurization units (PSU) constituting the first laminated structure (SST1) may be greater than the number of pressurization units (PSU) constituting the third laminated structure (SST3).

[0134] Referring back to FIG. 11A, a dry bag body (DBB) may be provided on the first to third stacked structures (SST1 to SST3) arranged in a cross shape. The dry bag body (DBB) may include a cross-shaped through hole. The first to third stacked structures (SST1 to SST3) arranged in a cross shape may be inserted into the through hole. As a result, the dry bag body (DBB) may seal the first to third stacked structures (SST1 to SST3). The transfer basket (TFB), the first to third stacked structures (SST1 to SST3), and the dry bag body (DBB) may constitute a dry bag unit (DBU).

[0135] Fig. 12 is a cross-sectional view showing a wet pressurization device according to one embodiment of the present invention. Fig. 13a is an enlarged cross-sectional view of area M of Fig. 12. Fig. 13b is an enlarged cross-sectional view of area N of Fig. 12.

[0136] Referring to FIGS. 12, 13a and 13b, the wet pressurization device may include a vessel (VSS), a fixed dry bag (FDB), a first closure (CLS1) and a second closure (CLS2). The vessel (VSS) may have a cylindrical empty space (ETS) therein. A central axis of the empty space (ETS) may be parallel to the first direction (D1). A fixed dry bag (FDB) may be provided within the empty space (ETS) of the vessel (VSS). The fixed dry bag (FDB) may be slightly spaced apart from an inner wall of the vessel (VSS) without contacting it. A pressurized medium (PMD) may be filled in the space between the fixed dry bag (FDB) and the inner wall of the vessel (VSS).

[0137] The fixed dry bag (FDB) may have a hollow cylindrical shape. The central axis of the fixed dry bag (FDB) may be parallel to the first direction (D1). The fixed dry bag (FDB) may not completely fill the empty space (ETS) of the vessel (VSS), but may provide a space to accommodate the dry bag unit (DBU).

[0138] The lower portion of the fixed dry bag (FDB) may include a connection member (CNP) (see Fig. 13b). The connection member (CNP) may be in direct contact with the inner wall of the vessel (VSS). The fixed dry bag (FDB) may be fixed to the inner wall of the vessel (VSS) by the connection member (CNP). The space filled with the pressurized medium (PMD) may be sealed by the connection member (CNP). The pressurized medium (PMD) may be sealed by the connection member (CNP) so that it does not leak out to the outside.

[0139] The first closure (CLS1) may function as a cover that seals the upper portion of the vessel (VSS). In one embodiment, the first closure (CLS1) may be fixed to the upper portion of the vessel (VSS). The second closure (CLS2) may function as a cover that seals the lower portion of the vessel (VSS). The second closure (CLS2) may be configured to be openable.

[0140] FIGS. 14 and 15 are perspective views illustrating a dry press process according to one embodiment of the present invention, each of which is a perspective view showing a dry press device.

[0141] Referring to FIG. 14, a plurality of dry bag units (DBU) may be provided. For example, the plurality of dry bag units (DBU) may include first to third dry bag units (DBU1 to DBU3). The first to third dry bag units (DBU1 to DBU3) may be stacked along a first direction (D1).

[0142] The first to third stacked dry bag units (DBU1-DBU3) can be inserted into the empty space (ETS) of the vessel (VSS). More specifically, the first to third dry bag units (DBU1-DBU3) can be inserted into the fixed dry bag (FDB). The first to third dry bag units (DBU1-DBU3) can be covered by the fixed dry bag (FDB).

[0143] In one embodiment, the first to third stacked dry bag units (DBU1 to DBU3) may be mounted on the upper surface of the second closer (CLS2). In other words, the transfer basket (TFB) of the first dry bag unit (DBU1) may be in direct contact with the upper surface of the second closer (CLS2). By raising the second closer (CLS2), the first to third dry bag units (DBU1 to DBU3) may be inserted into the fixed dry bag (FDB).

[0144] Referring to Fig. 15, after the first to third dry bag units (DBU1 to DBU3) are inserted into the fixed dry bag (FDB), the vessel (VSS) can be sealed with the second closure (CLS2). By sealing the lower portion of the vessel (VSS) with the second closure (CLS2), the first to third dry bag units (DBU1 to DBU3) can be surrounded and sealed by the fixed dry bag (FDB). A pressurized medium (PMD) can surround the fixed dry bag (FDB).

[0145] Although not shown separately, piping, valves, and pumps configured to pump a pressurized medium (PMD) at high pressure may be provided. By pressurizing the pressurized medium (PMD) at high pressure, high pressure can be applied to the fixed dry bag (FDB). High pressure can be applied to the dry bag unit (DBU) by the pressurized fixed dry bag (FDB). An isotropic pressurization process can be performed on each of the plurality of electrode bodies (10) by the pressurized fixed dry bag (FDB).

[0146] The isotropic pressurization device according to this embodiment can fill the very narrow space between the fixed dry bag (FDB) and the inner wall of the vessel (VSS). This allows for generating a high isotropic pressure with a small amount of the pressurized medium (PMD). In other words, the present invention can improve the process efficiency of the isotropic pressurization process.

[0147] The isotropic pressurization device according to the present embodiment can isotropically pressurize the electrode body (10) using a dry process. Since the dry process is used, a separate pouch for pressing the electrode body (10) is not required, and the dry bag of the device can be reused. Therefore, the isotropic pressurization device according to the present invention can improve the efficiency of the pressurization process.

[0148]

[0149] While embodiments of the present invention have been described with reference to the attached drawings, the present invention may be implemented in other specific forms without altering the technical spirit or essential features thereof. Therefore, it should be understood that the embodiments described above are exemplary in all respects and are not limiting.

Claims

1. A die plate including a landing portion and a peripheral portion surrounding the landing portion; A cavity structure on the peripheral portion, the cavity structure including a cavity exposing the landing portion, the cavity providing a space for accommodating an electrode body that is the object of a pressurizing process on the landing portion; and Including a punch structure on the above cavity structure, The above die plate comprises metal, A pressurizing device in which each of the cavity structure and the punch structure includes an elastic material.

2. In paragraph 1, The above landing part is a pressurizing device that protrudes compared to the surrounding part.

3. In paragraph 1, A pressurizing device in which the upper surface of the above cavity structure is higher than the upper surface of the landing portion.

4. In paragraph 1, The inner surface of the above cavity is a pressurizing device that comes into contact with the side wall of the landing section.

5. In paragraph 1, A pressurizing device further comprising a fixed film between the cavity structure and the punch structure.

6. In paragraph 1, The hardness (Shore A) of the above elastic material is 30 to 90, A pressurizing device wherein the tensile strength of the elastic material is 1 MPa to 50 MPa.

7. In paragraph 1, A pressurized device comprising at least one selected from the group consisting of urethane rubber, nitrile rubber, butyl rubber, fluororubber, chloroprene rubber, ethylene rubber, and silicone rubber.

8. In paragraph 1, Further comprising a dry bag body and a dry bag cover on the dry bag body, The above die plate, the cavity structure and the punch structure constitute a pressurizing unit, The above dry bag body and the above dry bag cover are pressurizing devices that define an internal space that accommodates and seals the pressurizing unit.

9. In paragraph 8, The above pressurizing unit is provided in multiple units to form a laminated structure, The above dry bag body and the above dry bag cover are pressurized devices that accommodate and seal the laminated structure.

10. In paragraph 8, The above dry bag body and the above dry bag cover are each a pressurizing device including an elastic material.

11. In paragraph 8, The above dry bag body, the pressurizing unit, and the dry bag cover constitute a dry bag unit, The above pressurizing device: a vessel accommodating the above dry bag unit; and A pressurizing device further comprising a pressurizing medium filling the space between the vessel and the dry bag unit.

12. A die plate comprising a plurality of die regions, the plurality of die regions being arranged along a first direction, each of the plurality of die regions including a first landing portion on its upper portion; A first cavity structure provided on each of the plurality of die regions, the first cavity structure surrounding the first landing portion; A first electrode body on the first landing portion; and Including a first punch structure on the die plate, A pressing device in which the first electrode body is interposed between the first landing portion and the first punch structure on each of the plurality of die areas.

13. In paragraph 12, Each of the above plurality of die regions further includes a second landing portion thereunder, The above pressurizing device: a second cavity structure provided on each of the plurality of die regions, the second cavity structure surrounding the second landing portion; and A pressurizing device further comprising a second electrode body on the first landing portion.

14. In paragraph 13, Further comprising a second punch structure below the die plate, A pressing device in which the second electrode body is interposed between the second landing portion and the second punch structure on each of the plurality of die areas.

15. In paragraph 12, Further comprising a dry bag body and a dry bag cover on the dry bag body, The die plate, the first cavity structure, the first electrode body, and the first punch structure constitute a pressurizing unit, The above dry bag body and the above dry bag cover are pressurizing devices that define an internal space that accommodates and seals the pressurizing unit.

16. Providing an electrode body on the landing portion of the die plate; Providing a cavity structure surrounding the electrode body; Covering the electrode body with a punch structure to form a pressurizing unit; Sealing the pressurized unit with a dry bag body and a dry bag cover to form a dry bag unit; and A method for pressurizing an electrode body, comprising performing an isotropic pressurization process on the above dryback unit.

17. In paragraph 16, Performing the above isotropic pressing process: Providing the above dry bag unit within the vessel; and A method for pressurizing an electrode body, comprising pressurizing a pressurized medium that fills a space between the dryback unit and the vessel.

18. In paragraph 17, Providing the dry bag unit within the vessel comprises inserting the dry bag unit into a fixed dry bag fixed within the vessel. Method of pressurizing the electrode body.

19. In paragraph 18, A method for pressurizing an electrode body, wherein the pressurized medium fills the space between the fixed dry bag and the vessel.

20. In paragraph 16, The above die plate comprises metal, A method for pressurizing an electrode body, wherein each of the cavity structure, the punch structure, the dry bag body, and the dry bag cover comprises an elastic material.

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