All-solid-state battery and method for manufacturing all-solid-state battery

Abstract

The present invention relates to an all-solid-state battery and a method for manufacturing the all-solid-state battery. More specifically, the all-solid-state battery comprises: a can assembly in which an all-solid state battery cell is accommodated; a tab plate connected to an electrode tab part of the all-solid-state battery cell; a cap assembly coupled to the can assembly; and a tab organizing region formed recessed in the can assembly, wherein the electrode tab part includes a connection portion connected to the tab plate and a remaining portion not connected to the tab plate, and the remaining portion may be disposed in the tab organizing region and spaced apart from the can assembly.

Description

All-solid-state battery and method for manufacturing an all-solid-state battery

[0001] The present invention relates to an all-solid-state battery and a method for manufacturing an all-solid-state battery. More specifically, the invention provides a structure for a prismatic all-solid-state battery, and relates to an all-solid-state battery and a method for manufacturing an all-solid-state battery that prevents short circuits between a case and an electrode tab during manufacturing, allows for the organization of the electrode tab, stably guides the coupling between a can assembly and a cap assembly, and secures a welding area.

[0002]

[0003] In response to recent industrial demands, the development of batteries with high energy density and safety is actively underway. Recently, all-solid-state batteries, which replace liquid electrolytes with solid electrolytes, have been proposed. An all-solid-state battery is a battery formed by stacking a positive electrode, a solid electrolyte, and a negative electrode, and then densifying them under pressure; it utilizes a solid electrolyte instead of the liquid electrolyte found in conventional rechargeable batteries. By not using flammable organic dispersion media, all-solid-state batteries can significantly reduce the likelihood of fire or explosion in the event of a short circuit. Consequently, these all-solid-state batteries possess high safety.

[0004] Prismatic all-solid-state batteries are a form in which an all-solid-state battery is housed within a case of a fixed size. To increase stability and reduce the defect rate during the manufacturing process of prismatic all-solid-state batteries, it is necessary to prevent short circuits from occurring between the electrode tabs of the all-solid-state battery cell and the case.

[0005] All-solid-state batteries can be manufactured in various forms depending on the customer's delivery requirements and design specifications. Among these, prismatic all-solid-state batteries are a type in which all-solid-state battery cells are housed inside a rigid case.

[0006] One form of a prismatic all-solid-state battery may include a can assembly in which an all-solid-state battery cell is housed and a cap assembly coupled to the can assembly to seal the all-solid-state battery cell. When the can assembly and the cap assembly are combined, if tilting or the like occurs in the cap assembly, the combined position may be misaligned, and consequently, welding defects may occur. This can reduce productivity and degrade product quality.

[0007]

[0008] The problem that the present invention aims to solve is to provide an all-solid-state battery that prevents short circuits between the case and the electrode tabs, organizes the electrode tabs, stably guides the connection between the can assembly and the cap assembly, and secures a welding area.

[0009] Another problem that the present invention aims to solve is to provide a method for manufacturing an all-solid-state battery that prevents a short circuit between the case and the electrode tab during the manufacturing process and allows for the organization of the electrode tab.

[0010]

[0011] According to the concept of the present invention, an all-solid-state battery comprises: a can assembly in which an all-solid-state battery cell is accommodated; a tab plate connected to an electrode tab portion of the all-solid-state battery cell; a cap assembly coupled to the can assembly; and a tab organizing area formed by being recessed in the can assembly; wherein the electrode tab portion includes a connecting portion connected to the tab plate and a remaining portion not connected to the tab plate, and the remaining portion is disposed in the tab organizing area and can be spaced apart from the can assembly.

[0012] According to another concept of the present invention, an all-solid-state battery comprises: a can assembly in which an all-solid-state battery cell is accommodated; a cap assembly coupled to the can assembly; and a guide unit that guides the coupling of the can assembly and the cap assembly, wherein the guide unit comprises: a first guide portion disposed on the can assembly; and a second guide portion disposed on the cap assembly; wherein one of the first guide portion or the second guide portion comprises a guide slot in a recessed form, and the other comprises a guide projection in a protruding form, and the guide projection may be inserted into the guide slot.

[0013] According to another concept of the present invention, a method for manufacturing an all-solid-state battery comprises: arranging an all-solid-state battery cell inside a can assembly; connecting an electrode tab portion of the all-solid-state battery cell to a tab plate; taping and arranging a remaining portion on the electrode tab portion that is not connected to the tab plate in a tab arrangement area; and joining a cap assembly to the can assembly to form a case; wherein the remaining portion may be arranged in the tab arrangement area and spaced apart from the can assembly.

[0014]

[0015] The all-solid-state battery and the method for manufacturing the all-solid-state battery according to the present invention allow the electrode tabs of the all-solid-state battery cell to be arranged without contact with the case during the manufacturing process of the prismatic all-solid-state battery. This prevents a short circuit from occurring between the case and the electrode tabs of the all-solid-state battery cell.

[0016] The present invention can increase stability during the battery manufacturing process and reduce the defect rate.

[0017] The present invention can improve the bonding between a can assembly and a cap assembly in a prismatic all-solid-state battery. That is, it can prevent mutual tilting or the like from occurring when the can assembly and the cap assembly are bonded.

[0018] The present invention can minimize the assembly step difference at the joint between the can assembly and the cap assembly, thereby stably securing the welding area and improving welding quality.

[0019] The present invention can increase the productivity of prismatic all-solid-state batteries, reduce manufacturing costs, and improve product reliability.

[0020]

[0021] FIG. 1 is a cross-sectional view of an all-solid-state battery cell (unit cell) according to embodiments of the present invention.

[0022] FIG. 2 is a cross-sectional view of an all-solid-state battery cell (bicell) according to embodiments of the present invention.

[0023] FIG. 3 is a drawing for explaining an all-solid-state battery cell (cell stack) according to embodiments of the present invention.

[0024] FIG. 4a is an assembly diagram illustrating an all-solid-state battery according to embodiments of the present invention.

[0025] FIG. 4b is a drawing for explaining the tap cleaning area, electrode tap, and tap plate portion according to embodiments of the present invention.

[0026] FIG. 5a is an assembly diagram illustrating a guide unit disposed in an all-solid-state battery according to embodiments of the present invention.

[0027] FIG. 5b is a perspective view illustrating an all-solid-state battery according to embodiments of the present invention.

[0028] FIG. 5c is a front view illustrating an all-solid-state battery according to embodiments of the present invention.

[0029] FIG. 6a is a schematic cross-sectional view of the AA' portion disclosed in FIG. 5c.

[0030] FIG. 6b is an enlarged view of the dotted line portion disclosed in FIG. 6a.

[0031] FIG. 6c is a schematic cross-sectional view of the BB' portion disclosed in FIG. 5c.

[0032] FIG. 6d is an enlarged view of the dotted line portion disclosed in FIG. 6c.

[0033] FIG. 7a is a drawing illustrating the state of taping the electrode tab portion in the upper tab organizing area according to embodiments of the present invention.

[0034] FIG. 7b is a drawing illustrating the state of taping the electrode tab portion in the lower tab organizing area according to embodiments of the present invention.

[0035] FIG. 8a is a drawing illustrating the state before welding the tapping area and the electrode tap according to embodiments of the present invention.

[0036] FIG. 8b is a drawing illustrating the state in which a tapping area and an electrode tab are welded and the remaining portion of the electrode tab is taped according to embodiments of the present invention.

[0037] FIG. 8c is a drawing illustrating the state in which the remaining portion of a taped electrode tab according to embodiments of the present invention is fixed to an elastic sheet of a tab finishing area.

[0038] FIG. 9a is a front view illustrating an embodiment of a first guide part disposed in a can assembly according to an embodiment of the present invention.

[0039] FIG. 9b is a front view illustrating an embodiment of a second guide part disposed in a cap assembly according to an embodiment of the present invention.

[0040] FIG. 10a is a front view illustrating another embodiment of a first guide part disposed in a can assembly according to an embodiment of the present invention.

[0041] FIG. 10b is a front view illustrating another embodiment of a second guide part disposed in a cap assembly according to an embodiment of the present invention.

[0042] FIG. 11a is a front view illustrating the height (H1) and width (D1) of a guide projection according to an embodiment of the present invention.

[0043] FIG. 11b is a front view illustrating the depth (H2) and width (D2) of a guide slot according to an embodiment of the present invention.

[0044] FIG. 12a is a cross-sectional view illustrating a structure for inserting a guide projection into a guide slot according to an embodiment of the present invention.

[0045] FIG. 12b is a cross-sectional view illustrating a structure for inserting a guide projection including an inclined portion into a guide slot according to an embodiment of the present invention.

[0046] FIG. 12c is a cross-sectional view illustrating a structure for inserting a guide projection including a curved portion according to an embodiment of the present invention into a guide slot.

[0047] FIGS. 13a to 13f are drawings for explaining a fixing part according to an embodiment of the present invention.

[0048] FIG. 14 is a flowchart for explaining a method for manufacturing an all-solid-state battery according to an embodiment of the present invention.

[0049]

[0050] In order to fully understand the structure and effects of the present invention, preferred embodiments of the present invention are described with reference to the attached drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and various modifications can be made. The description of these embodiments is provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention.

[0051] In this specification, when a component is described as being on another component, it means that it may be formed directly on the other component or that a third component may be interposed between them. Additionally, in the drawings, the thicknesses of the components are exaggerated for the effective description of the technical content. Throughout the specification, parts indicated by the same reference numeral represent the same components.

[0052] The embodiments described herein will be described with reference to cross-sectional and / or plan views, which are exemplary illustrations of the invention. In the drawings, the thicknesses of films and regions are exaggerated for effective description of the technical content. Accordingly, the regions illustrated in the drawings are schematic in nature, and the shapes of the regions illustrated in the drawings are intended to illustrate specific forms of regions of the device and are not intended to limit the scope of the invention. Although terms such as first, second, third, etc., have been used to describe various components in the various embodiments of this specification, these components should not be limited by such terms. These terms are used merely to distinguish one component from another. The embodiments described and illustrated herein also include their complementary embodiments.

[0053] The terms used herein are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, 'comprises' and / or 'comprising' do not exclude the presence or addition of one or more other components to the mentioned components.

[0054]

[0055] FIG. 1 discloses a unit cell shape of an all-solid-state battery cell (10) according to embodiments of the present invention.

[0056] Referring to FIG. 1, the all-solid-state battery cell (10) may include a positive electrode layer (20), a negative electrode layer (30) facing the positive electrode layer (20), and a solid electrolyte layer (40) disposed between the positive electrode layer (20) and the negative electrode layer (30). However, not limited thereto, the all-solid-state battery cell (10) may further include an additional functional layer, such as an adhesion enhancing layer, disposed between the positive electrode layer (20) and the solid electrolyte layer (40) or between the negative electrode layer (30) and the solid electrolyte layer (40).

[0057] The positive layer (20) may include a positive current collector (21) and a positive active material layer (23) disposed on the positive current collector (21). The positive active material layer (23) may include a positive active material, a solid electrolyte, a conductive material, and a binder.

[0058] The positive current collector (21) can provide a reference surface on which the positive active material layer (23) is placed. The positive current collector (21) may have a plate or foil form. For example, the positive current collector (21) may include 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.

[0059] Unlike as illustrated in FIG. 1, in one embodiment of the present invention, the positive current collector (21) may be omitted. Although not illustrated, a carbon layer with a thickness of 0.1 μm to 4 μm may be further disposed between the positive current collector (21) and the positive active material layer (23) to increase the bonding strength between the positive current collector (21) and the positive active material layer (23).

[0060] The positive electrode active material may be a material capable of reversibly absorbing and desorbing lithium ions. For example, the positive electrode active material may include 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, and lithium iron phosphate, nickel sulfide, copper sulfide, lithium sulfide, iron oxide, or vanadium oxide, but is not limited thereto. The positive electrode active material may be a single material or a mixture of two or more materials.

[0061] Lithium transition metal oxides are, 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-c Mn 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-fIt may be a compound represented by any one of Fe2(PO4)3 (0≤f≤2) or LiFePO4. In such a compound, the uppercase “A” is Ni, Co, Mn, or a combination thereof; the uppercase “B” is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, a rare earth element, or a combination thereof; the uppercase “D” is O, F, S, P, or a combination thereof; the uppercase “E” is Co, Mn, or a combination thereof; the uppercase “F” is F, S, P, or a combination thereof; the uppercase “G” is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; the uppercase “Q” is Ti, Mo, Mn, or a combination thereof; the uppercase “I” is Cr, V, Fe, Sc, Y, or a combination thereof; and the uppercase “J” is V, Cr, Mn, Co, Ni, Cu, or a combination thereof.

[0062] The positive electrode 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 and metal atomic layers are alternately and regularly arranged in a specific direction, thereby forming a two-dimensional plane for each atomic layer. The "cubic rock salt type structure" represents a sodium chloride (NaCl) type structure, which is a type of crystal structure; specifically, it exhibits a structure in which face-centered cubic lattices (fcc) formed by cations and anions, respectively, are offset from each other by half the ridge of the unit lattice. Lithium transition metal oxides having such a layered rock salt type structure are, for example, LiNi x Co y Al z O2(NCA) or LiNi x Co y Mnz O2(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 셀(10)의 에너지 밀도가 커지고 열안정성이 향상될 수 있다.

[0063] The aforementioned compound contained 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 aforementioned compound and the compound to which the coating layer is added. Meanwhile, the coating layer added to the surface of the positive electrode active material may include, for example, oxides, hydroxides, oxyhydroxides, oxycarbonates, or hydroxycarbonates of the following coating elements. The compounds forming this coating layer may be 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 may be 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 may include, for example, spray coating or immersion methods.

[0064] When the positive active material is a ternary lithium transition metal oxide such as NCA or NCM and contains nickel (Ni), the capacity density of the all-solid-state battery cell (10) can be increased, and the metal leaching of the positive active material in the charged state can be reduced. As a result, the cycle characteristics of the all-solid-state battery cell (10) in the charged state can be improved. Meanwhile, “cycle characteristics” is a characteristic that indicates the degree of deterioration of the all-solid-state battery cell (10) due to charging and discharging of the all-solid-state battery cell (10). An all-solid-state battery cell (10) with high cycle characteristics has a small degree of deterioration due to charging and discharging, while an all-solid-state battery cell (10) with low cycle characteristics may have a large degree of deterioration due to charging and discharging.

[0065] The shape of the positive electrode active material may include particle shapes such as spheres or ellipsoids. The particle size and content of the positive electrode active material are not particularly limited.

[0066] The solid electrolyte may include a sulfide-based solid electrolyte with excellent lithium ion conductivity characteristics. Sulfide-based solid electrolytes include, for example, Li2S-P2S5, Li2S-P2S5-LiX (where 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, and Li2S-P2S5-Z m S n (m, n are positive numbers, uppercase “Z” is one of Ge, Zn, or Ga), Li2S-GeS2, Li2S-SiS2-Li3PO4, Li2S-SiS2-Li p MO q (p, q are positive numbers, uppercase “M” is one of P, Si, Ge, B, Al, Ga, In), 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 It may include at least one selected from (0≤x≤2).

[0067] Sulfide-based solid electrolytes are, 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-x PS 6-x I x It may be an argyrodite-type compound comprising one or more selected from (0≤x≤2). In particular, the sulfide-based solid electrolyte may be an argyrodite-type compound comprising one or more selected from Li6PS5Cl, Li6PS5Br, and Li6PS5I. The density of the argyrodite-type solid electrolyte may be 1.5 g / cc to 2.0 g / cc. By having a density of 1.5 g / cc or higher for the argyrodite-type solid electrolyte, the internal resistance of the all-solid-state battery is reduced, and defects such as penetration and short circuit of the solid electrolyte film due to lithium dendrite formation can be prevented. The elastic modulus of the solid electrolyte may be, for example, 15 GPa to 35 GPa.

[0068] The solid electrolyte included in the positive electrode active material layer (23) may have a smaller average particle size (D50) of intermediate particle size compared to the solid electrolyte included in the solid electrolyte layer (40). For example, the average particle size (D50) of the solid electrolyte included in the positive electrode active material layer (23) 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 size (D50) of the solid electrolyte included in the solid electrolyte layer (40). Meanwhile, the average particle size (D50) may be a median diameter measured using a laser particle size distribution meter.

[0069] The positive active material layer (23) may include a conductive material. The conductive material may have conductivity without causing chemical changes in the all-solid-state battery cell (10), thereby increasing the conductivity of the positive 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.

[0070] The positive active material layer (23) may further include a binder. The binder may include a material for bonding the positive active material, solid electrolyte, and conductive material contained in the positive active material layer (23), and for improving the bonding strength with the positive current collector (21). For example, the binder may include polyvinylidene fluoride, styrene butadiene rubber (SBR), polytetrafluoroethylene, polyvinylidene fluoride, vinylidene fluoride / hexafluoropropylene copolymer, polyacrylonitrile, or polymethyl methacrylate.

[0071] When the total of the positive active material, solid electrolyte, conductive material, and binder is 100 parts by weight, the positive active material layer (23) may include 85 to 92 parts by weight of the positive active material. The positive active material layer (23) may include 0.5 to 1.5 parts by weight of the binder.

[0072] In the positive active material layer (23), the conductive material may have 1 to 50 parts by weight per 100 parts by weight of solid electrolyte. If the conductive material is less than 1 part by weight per 100 parts by weight of solid electrolyte, the electrical conductivity of the positive active material layer (23) may be reduced. If the conductive material is more than 50 parts by weight per 100 parts by weight of solid electrolyte, the ratio of the conductive material is excessively high, so a coating layer covering the surface of the solid electrolyte may not be properly formed.

[0073] According to the embodiments, the positive active material layer (23) may further include at least one additive selected from the group consisting of a filler, a coating agent, a dispersant, and an ion-conducting aid, in addition to the positive active material, solid electrolyte, conductive material, and binder described above.

[0074] The solid electrolyte layer (40) is disposed between the positive electrode layer (20) and the negative electrode layer (30) and may include a sulfide-based solid electrolyte with excellent lithium ion conductivity characteristics. The solid electrolyte included in the solid electrolyte layer (40) may be the same as or different from any one of the materials that may be included in the solid electrolyte included in the aforementioned positive electrode active material layer (23).

[0075] The solid electrolyte layer (40) of one embodiment may include a sulfide-based solid electrolyte. The sulfide-based solid electrolyte may be manufactured by processing starting materials, such as Li2S or P2S5, by a melt quenching method or a mechanical milling method. Additionally, heat treatment may be performed after such processing. The solid electrolyte may be amorphous, crystalline, or a mixture thereof. Furthermore, the solid electrolyte may include sulfur (S), phosphorus (P), and lithium (Li) as at least constituent elements among the sulfide-based solid electrolyte materials described above, for example. For example, the solid electrolyte may be a material containing Li2S-P2S5. When using a sulfide-based solid electrolyte material containing Li2S-P2S5 to form the solid electrolyte, the molar ratio of Li2S and P2S5 is, for example, in the range of Li2S : P2S5 = 50 : 50 to 90 : 10.

[0076] Sulfide-based solid electrolytes are, 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-x PS 6-x I xIt may be an argyrodite-type compound comprising one or more selected from (0≤x≤2). In particular, the sulfide-based solid electrolyte may be an argyrodite-type compound comprising one or more selected from Li6PS5Cl, Li6PS5Br, and Li6PS5I. The density of the argyrodite-type solid electrolyte may be 1.5 g / cc to 2.0 g / cc. By having a density of 1.5 g / cc or higher for the argyrodite-type solid electrolyte, the internal resistance of the all-solid-state battery is reduced, and defects such as penetration and short circuits of the solid electrolyte film due to lithium dendrite formation can be prevented. The elastic modulus of the solid electrolyte is, for example, 15 GPa to 35 GPa.

[0077] The solid electrolyte layer (40) may further include a binder. The binder in the solid electrolyte layer (40) is not limited to, for example, styrene butadiene rubber (SBR), polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, etc. The binder of the solid electrolyte layer (40) may be the same as or different from the binder included in the positive active material layer (23) or the binder included in the coating layer (33).

[0078] The negative electrode layer (30) may include a negative electrode current collector (31) and a coating layer (33) on the negative electrode current collector (31). The negative electrode current collector (31) may provide a reference surface on which the coating layer (33) is placed. The negative electrode current collector (31) may include, for example, a material that does not react with lithium, that is, does not form any alloys or compounds with lithium. For example, the negative electrode current collector (31) 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 (31) may be 1 μm to 20 μm, more specifically 5 μm to 15 μm, and more specifically 7 μm to 10 μm.

[0079] The negative current collector (31) may be composed of one of the metals described above, or may include an alloy of two or more metals or a coating material. The negative current collector (31) may, for example, have a plate-like or foil-like shape. Meanwhile, in one embodiment, the negative current collector (31) may be omitted.

[0080] The coating layer (33) can allow lithium metal to grow between the all-solid-state battery cell (10) and the negative current collector (31) during charging. The coating layer (33) can serve as a protective layer for the lithium metal and simultaneously suppress the precipitation and growth of lithium dendrites.

[0081] The coating layer (33) may include metal and carbon. For example, the coating layer (33) 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 coating layer (33) 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 coating layer (33) may include a mixture of carbon black and silver (Ag).

[0082] The coating layer (33) may further include other additives in addition to metal and carbon. The coating layer (33) may further include at least one additive selected from the group consisting of, for example, binders, fillers, coating agents, dispersants, and ion-conducting aids.

[0083] The coating layer (33) may have a smaller thickness compared to the positive active material layer (23). The thickness of the coating layer (33) 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 active material layer (23). The thickness of the coating layer (33) may be, for example, 1 µm to 20 µm, 2 µm to 10 µm, or 3 µm to 7 µm. If the thickness of the coating layer (33) is excessively thin, lithium dendrites formed between the coating layer (33) and the negative current collector (31) may cause the coating layer (33) to collapse, thereby degrading the cycle characteristics of the all-solid-state battery cell (10). If the thickness of the coating layer (33) increases excessively, the energy density of the all-solid-state battery cell (10) decreases, and the internal resistance of the all-solid-state battery cell (10) due to the coating layer (33) increases, which may degrade the cycle characteristics of the all-solid-state battery cell (10).

[0084] Meanwhile, although not shown, a carbon layer may be further included to improve adhesion between the coating layer (33) and the solid electrolyte layer (40).

[0085]

[0086] FIG. 2 discloses a bi-cell form of an all-solid-state battery cell (10) according to embodiments of the present invention.

[0087] The bicell may be in a form in which an anode layer (20), a solid electrolyte layer (40), a cathode layer (30), a solid electrolyte layer (40), and an anode layer (20) are sequentially stacked, as disclosed in FIG. 2. Alternatively, although not illustrated in the drawing, it may be in a form in which a cathode layer (30), a solid electrolyte layer (40), an anode layer (20), a solid electrolyte layer (40), and a cathode layer (30) are sequentially stacked.

[0088] In other words, a bi-cell can be defined as an all-solid-state battery cell (10) in which the electrodes at both ends are the same. And the bi-cell only needs to have the electrodes at both ends the same, and there may be no limit to the number of stacked electrode layers and solid electrolyte layers.

[0089] Half-cells can be laminated and stacked on the bicell. Here, a half-cell can be defined as a cell comprising one electrode layer and one solid electrolyte layer.

[0090] A plurality of half cells are stacked on a bicell to form a cell stack disclosed in FIG. 3.

[0091]

[0092] FIG. 3 discloses a cell stack form of an all-solid-state battery cell (10) according to embodiments of the present invention.

[0093] Referring to FIG. 3, the cell stack of the all-solid-state battery cell (10) can be configured by stacking a plurality of half cells on a bicell.

[0094] Electrode tab portions (TBA) may be disposed on both sides of the all-solid-state battery cell (10).

[0095] The electrode tab portion (TBA) may include a first electrode tab portion (TBA1) and a second electrode tab portion (TBA2).

[0096] When the first electrode tab portion (TBA1) is connected to the positive layers (20), the second electrode tab portion (TBA2) can be connected to the negative layers (30). In this case, the first electrode tab portion (TBA1) can be a positive tab assembly, and the second electrode tab portion (TBA2) can be a negative tab assembly. In other words, the first electrode tab portion (TBA1) can be in the form of a plurality of positive electrode tabs (TB1, TB2) connected to the positive layers (20).

[0097] Conversely, when the first electrode tab portion (TBA1) is connected to the negative electrode layer (30), the second electrode tab portion (TBA2) can be connected to the positive electrode layer (20). In this case, the first electrode tab portion (TBA1) can be a negative electrode tab assembly, and the second electrode tab portion (TBA2) can be a positive electrode tab assembly. In other words, the first electrode tab portion (TBA1) may be in the form of a plurality of negative electrode tabs (TB1, TB2) connected to the negative electrode layers (30).

[0098] Meanwhile, in the embodiments of the present invention, a plurality of first electrode tab portions (TBA1) and second electrode tab portions (TBA2) may be arranged along the first direction (D1). In other words, a plurality of electrode tab portions (TBA1, TBA2) may be arranged along the width direction (D1) of the all-solid-state battery cell (10). FIG. 3 discloses a state in which a pair of first electrode tab portions (TBA11, TBA12) are arranged along the width direction (D1) of the all-solid-state battery cell (10).

[0099] Figure 3 illustrates two first electrode tab sections (TBA11, TBA12), but is not limited thereto, and the number may be changed according to design specifications, design purpose, etc.

[0100] A structure in which a plurality of electrode tab portions (TBA1, TBA2) are arranged along the first direction (D1) can improve electrical conductivity between the plurality of electrode tab portions (TBA1, TBA2) and the tab plate (130) because when the electrode tab portion (TBA) is welded to the tab plate (130), there are multiple welded areas. A detailed explanation will be provided later.

[0101]

[0102] The first direction (D1), second direction (D2), and third direction (D3) described below may be defined as follows. The first direction (D1) may indicate the width direction or left-right direction of the prismatic all-solid-state battery, the second direction (D2) may indicate the length direction or front-back direction of the prismatic all-solid-state battery, and the third direction (D3) may indicate the up-down direction of the prismatic all-solid-state battery. In addition, various other types of directions may be defined as needed.

[0103]

[0104] FIGS. 4a to 6d discloses an all-solid-state battery (100) according to embodiments of the present invention.

[0105] The all-solid-state battery (100) disclosed in FIG. 4a may be in the form in which the all-solid-state battery cell (10) disclosed in FIG. 3 is embedded in a case (101). In other words, it may be in the form in which a prismatic all-solid-state battery (100) is manufactured by embedding an all-solid-state battery cell (10) in the form of a cell stack in a case (101).

[0106] Referring to FIGS. 4a to 6d, an all-solid-state battery (100) according to embodiments of the present invention may include a can assembly (110), a tab plate (130), a cap assembly (120), an elastic sheet (140), and a tab organizing area (200).

[0107] Referring to FIG. 4a, the can assembly (110) may include a plurality of can bodies (111a, 111b). The plurality of can bodies (111a, 111b) are combined with each other and may accommodate an all-solid-state battery cell (10) inside.

[0108] Multiple can bodies (111a, 111b) can apply pressure to the upper and lower parts of the all-solid-state battery cell (10). In other words, the upper can body (111a) positioned at the top and the lower can body (111b) positioned at the bottom are combined with each other with respect to the third direction (D3) to apply surface pressure to the all-solid-state battery cell (10).

[0109] The all-solid-state battery cell (10) can assemble the can assembly (110) while applying a certain pressure to reduce the interfacial resistance of the solid electrolyte layer (40). At this time, an elastic sheet (140), which will be described later, can be placed between the can assembly (110) and the all-solid-state battery cell (10) to maintain a certain pressure.

[0110] The upper can body (111a) and the lower can body (111b) can be joined together by welding the joint (111c). The position of the joint (111c) is not limited to the position disclosed in FIG. 4a, but can be changed according to the shape of the upper can body (111a) and the shape of the lower can body (111b).

[0111] When manufacturing a can assembly (110), an all-solid-state battery cell (10) can be placed on a lower can body (111b). The all-solid-state battery cell (10) can be pressed with an upper can body (111a), and the upper can body (111a) and the lower can body (111b) can be aligned with the joint (111c). Then, the joint (111c) can be welded.

[0112] In summary, while the all-solid-state battery cell (10) is being pressed by the upper can body (111a), the joint (111c) between the upper can body (111a) and the lower can body (111b) can be welded. By doing so, the can assembly (110) can maintain the state of pressing the all-solid-state battery cell (10).

[0113] The can body (111) may be made of a metal material with high strength. For example, it may be made of a metal material such as steel or stainless steel. Alternatively, the can body (111) may be made of an alloy material with enhanced strength.

[0114] The can assembly (110) may include a plurality of ribs (112). The plurality of ribs (112) may be arranged on the front and rear portions of the can assembly (110).

[0115] The front and rear portions of the can assembly (110) can each be defined as the portions to which the cap assembly (120) is joined. Referring to FIG. 4a, the front and rear portions of the can assembly (110) may be the open portions of the can assembly (110) with respect to the second direction (D2). Additionally, the front and rear portions of the can assembly (110) may be the portions where the electrode tab portion (TBA) of the all-solid-state battery cell (10) is exposed and the tab plate (130) is placed.

[0116] Multiple ribs (112) can guide the part where the cap assembly (120) is joined.

[0117] Multiple ribs (112) may include a center rib (112a) and a side rib (112b).

[0118] The center rib (112a) may be shaped to protrude in a second direction (D2) along the edge of the can body (111) from the front and rear portions of the can assembly (110). The side ribs (112b) may be arranged on both sides of the center rib (112a) along the first direction (D1) from the front and rear portions of the can assembly (110). The side ribs (112b) may be arranged spaced apart from the center rib (112a) at a predetermined distance. In an embodiment of the present invention, the side ribs (112b) may be shaped like a U along the edge of the can body (111). However, they are not limited thereto and may be changed according to the shape of the can body (111).

[0119] A tab organizing area (200) can be formed between multiple ribs (112). In other words, multiple ribs (112) can be arranged on the front and rear portions of the can assembly (110), and a tab organizing area (200) can be formed between the multiple ribs (112). Alternatively, a tab organizing area (200) can be formed by partially cutting the ribs (112) that are integrally formed on the front and rear portions of the can assembly (110). A detailed description of the tab organizing area (200) will be provided later.

[0120]

[0121] Referring to FIGS. 6a through 6d, the elastic sheet (140) may be placed between the all-solid-state battery cell (10) and the can assembly (110). In an embodiment of the present invention, the elastic sheet (140) may be placed to wrap around the all-solid-state battery cell (10). The front and rear portions of the all-solid-state battery cell (10) have electrode tab portions (TBA). The elastic sheet (140) may wrap around the remaining portion of the all-solid-state battery cell (10), excluding the front and rear portions of the all-solid-state battery cell (10).

[0122] In other words, the elastic sheet (140) can be placed along the perimeter of the all-solid-state battery cell (10) that the can assembly (110) wraps around. The elastic sheet (140) can be stretched and can provide a space area in which the volume of the all-solid-state battery cell (10) can change during charging and discharging of the all-solid-state battery cell (10).

[0123] In an embodiment of the present invention, the elastic sheet (140) may include an insulating material. Since the can assembly (110) and the all-solid-state battery cell (10) are not in direct contact due to the elastic sheet (140), the can assembly (110) and the all-solid-state battery cell (10) may not conduct electricity. The material of the elastic sheet (140) may include one or more of urethane rubber, nitrile rubber, butyl rubber, fluororubber, chloroprene rubber, ethylene rubber, and silicone rubber, but is not limited thereto.

[0124] Although not illustrated in the drawing, the inner surface of the can body (111) may be coated with a heat-resistant insulating material separately from the elastic sheet (140). In this case, electrical conductivity between the all-solid-state battery cell (10) and the inner surface of the can body (111) can be more effectively blocked.

[0125]

[0126] Referring to FIG. 4a and FIG. 6a through 6d, the tab plate (130) can be connected to the electrode tab portion (TBA) of the all-solid-state battery cell (10). In an embodiment of the present invention, the tab plate (130) and the electrode tab portion (TBA) can be welded. Laser welding may be applied as the welding process, but is not limited thereto. In addition, other connection methods capable of electrically energizing the tab plate (130) and the electrode tab portion (TBA) are also possible.

[0127] The tab plate (130) may include a side plate (131), a welded portion (132), a center plate (133), and an electrode terminal (134).

[0128] When the tab plate (130) is connected to or welded to the positive tab, the material of the tab plate (130) may include aluminum. In this case, the thickness of the tab plate (130) may be 0.1 to 0.2 mm.

[0129] When the tab plate (130) is connected to or welded to the cathode tab, the material of the tab plate (130) may include copper. In this case, the thickness of the tab plate (130) may be 0.2 to 0.4 mm.

[0130] The electrode terminal (134) can be energized to the terminal portion (122) of the cap assembly (120). In an embodiment of the present invention, the electrode terminal (134) can be energized to contact the terminal portion (122). The electrode terminal (134) may be cylindrical in shape, but is not limited thereto.

[0131] The center plate (133) may be plate-shaped, and electrode terminals (134) may be placed thereon.

[0132] The side plate (131) may be plate-shaped and may be connected to the center plate (133) by a link plate (133a). The side plate (131) may be connected to both sides of the center plate (133) along the first direction (D1).

[0133] Multiple electrode tab portions (TBA) can be welded to and connected to the side plate (131).

[0134] The weld (132) can be formed in the third direction (D3) on the side plate (131).

[0135] As described above, a plurality of electrode tabs (TB) may be stacked along a third direction (D3). Accordingly, in order to allow all of the plurality of electrode tabs (TB) to be energized to the side plate (131), a weld (132) may be formed on the side plate (131) in the third direction (D3).

[0136] Multiple welds (132) may be formed along the first direction (D1). Accordingly, multiple conductive portions may be formed between the side plate (131) and the electrode tab portion (TBA). This can increase the conductivity between the tab plate (130) and the electrode tab portion (TBA). For example, if only one weld (132) is formed, there is a possibility that some electrode tabs (TB) among the multiple electrode tabs (TB) may not be welded to the side plate (131) due to process errors. In this case, a problem may arise where the corresponding unit cell cannot be used.

[0137] Accordingly, a plurality of welds (132) can be formed between the side plate (131) and the electrode tab portion (TBA) so that all of the plurality of electrode tabs (TB) can be energized to the tab plate (130). This prevents the problem of a specific unit cell not being energized to the tab plate (130).

[0138] In embodiments of the present invention, LPW welding may be applied to the weld portion (132). LPW (Laser Powder Welding) welding may be a technique for welding by melting powder using a laser.

[0139] In an embodiment of the present invention, the center plate (133) and the side plate (131) may be in the shape of a square plate, but are not limited thereto.

[0140]

[0141] Referring to FIGS. 4a and FIGS. 6a through 6d, a cap assembly (120) can be coupled to a can assembly (110). The cap assembly (120) and the can assembly (110) can be coupled to form a case (101). The case (101) can form a receiving space (102) inside. An all-solid-state battery cell (10) can be accommodated in the receiving space (102).

[0142] The cap assembly (120) may include a cap body (121), a terminal part (122), and an insulating part (125).

[0143] The cap body (121) can be attached to the front and rear parts of the can assembly (110), respectively.

[0144] The cap body (121) is guided by a plurality of ribs (112) and can be coupled to the can assembly (110). And the tab plate (130) can be accommodated inside the cap body (121).

[0145] The terminal portion (122) can be positioned in the center of the cap body (121). A tab plate (130) can be in contact with the terminal portion (122) to allow for mutual electrical conduction.

[0146] For example, when the first electrode tab portion (TBA1) is connected to the positive electrode layer (20), the terminal portion (122) of the first cap body (120a) can be the positive electrode. And since the second electrode tab portion (TBA2) is connected to the negative electrode layer (30), the terminal portion (122) of the second cap body (120a) can be the negative electrode.

[0147] Conversely, when the first electrode tab (TBA1) is connected to the negative electrode layer (30), the terminal portion (122) of the first cap body (120a) can become the negative electrode. And since the second electrode tab (TBA2) is connected to the positive electrode layer (20), the terminal portion (122) of the second cap body (120a) can become the positive electrode.

[0148] One embodiment of the terminal portion (122) may be a form without the terminal hole (123) disclosed in FIG. 6a. In this case, the electrode terminal (134) may be in contact with the terminal portion (122) to conduct electricity to each other.

[0149] Another embodiment of the terminal portion (122) may be in the form of a terminal hole (123) that penetrates the terminal portion (122), as disclosed in FIG. 6a. The terminal hole (123) shown in FIG. 6a may be open. In this case, the electrode terminal (134) is inserted into the terminal hole (123) and can be electrically connected to it. And an external electrical wire can be directly connected to the electrode terminal (134).

[0150]

[0151] Referring to FIG. 4a and FIG. 6a to 6d, the insulating part (125) can be placed on the cap body (121).

[0152] The insulating part (125) may include a first insulating member (126) and a second insulating member (127).

[0153] In an embodiment of the present invention, the material of the first insulating member (126) may include a heat-resistant plastic. For example, it may include PPS material, but is not limited thereto. The material of the second insulating member (127) may include a plastic material. For example, it may include PET material, but is not limited thereto.

[0154] The first insulating member (126) can be placed between the cap body (121) and the terminal part (122) and can block current flow between the cap body (121) and the terminal part (122).

[0155] The first insulating member (126) may include an insulating plate (126a), a terminal insertion hole (126c), and an insulating line (126b).

[0156] The insulating plate (126a) may be plate-shaped and may be placed inside the cap body (121).

[0157] The terminal insertion hole (126c) can be formed by penetrating the insulating plate (126a). The electrode terminal (134) can be inserted into the terminal insertion hole (126c) and come into contact with the terminal portion (122).

[0158] On the insulating plate (126a), recessed concave portions (126d) may be formed on both sides of the terminal insertion hole (126c). The concave portions (126d) can reduce the weight of the insulating plate (126a). This allows the total weight of the all-solid-state battery (100) to be reduced. The concave portions (126d) may be formed when molding the insulating plate (126a).

[0159] The insulation line (126b) can be connected to the insulation plate (126a) and can protrude in a second direction (D2) along the edge of the insulation plate (126a). The insulation line (126b) can be positioned to penetrate the cap body (121). The insulation line (126b) can be positioned between the cap body (121) and the terminal part (122). Thus, the cap body (121) and the terminal part (122) can be insulated. Therefore, even if the electrode terminal (134) comes into contact with the terminal part (122), current may not flow to the cap body (121).

[0160] The second insulating member (127) may be disposed between the cap body (121) and the tab plate (130). The second insulating member (127) may block current flow between the cap body (121) and the tab plate (130). The second insulating member (127) may include an insulating block (127a) and an insulating rib (127b).

[0161] The insulating block (127a) may be plate-shaped and may be placed on both sides of the insulating plate (126a) along the first direction (D1) inside the cap body (121).

[0162] The insulating rib (127b) may be in the shape of a strap and may be arranged along the inner circumference of the cap body (121).

[0163] The insulating block (127a) and the insulating rib (127b) can block the tap plate (130) and the cap body (121) from being energized.

[0164] The side plate (131) can be in contact with the insulating block (127a). The insulating block (127a) supports the side plate (131) and can suppress the movement of the tab plate (130).

[0165] The insulating rib (127b) can be extended in the second direction (D2) to the portion where the side plate (131) is located. Even if the side plate (131) moves in the third direction (D3), the side plate (131) may first come into contact with the insulating rib (127b). Accordingly, the side plate (131) is prevented from coming into direct contact with the can assembly (110), thereby preventing the tab plate (130) and the can assembly (110) from being energized.

[0166] Although not illustrated in the drawing, the inner surface of the cap body (121) may be coated with a heat-resistant insulating material separately from the insulating part (125). In this case, the tab plate (130) can be more reliably blocked from conducting electricity to the cap body (121).

[0167]

[0168] Referring to FIGS. 4a, 4b, 6c, and 6d, a tab finishing area (200) can be formed on a can assembly (110). Specifically, the tab finishing area (200) can be formed between a plurality of ribs (112).

[0169] Here, referring to FIGS. 7a and 7b, the electrode tab portion (TBA) may include a connecting portion (TBR) connected to the tab plate (130) and a remaining portion (TBN) not connected to the tab plate (130).

[0170] The connection portion (TBR) of the electrode tab portion (TBA) can be defined as the portion welded to the side plate (131) of the tab plate (130). The remaining portion (TBN) of the electrode tab portion (TBA) can be defined as the portion not welded to the side plate (131) of the tab plate.

[0171] The remaining portion (TBN) of the electrode tab portion (TBA) can be placed in the tab cleaning area (200). And the connecting portion (TBR) of the electrode tab portion (TBA) can be spaced apart from the can assembly (110).

[0172] Here, in an embodiment where a plurality of ribs (112) separated from each other are provided on the front and rear portions of the can assembly (110), the tab organizing area (200) may be formed between the plurality of ribs (112). As described above, the plurality of ribs (112) may include a center rib (112a) and a side rib (112b). Accordingly, the tab organizing area (200) may be formed between the center rib (112a) and the side rib (112b).

[0173] Alternatively, in an embodiment where a rib (112) is provided integrally formed on the front and rear portions of the can assembly (110), the rib (112) can be partially cut to form a tab cleaning area (200). In other words, the rib (112) of the can assembly (110) can be partially cut to form a tab cleaning area (200) so that the remaining portion (TBN) of the electrode tab portion (TBA) can be cleaned. Accordingly, the rib (112) can be separated into a plurality of ribs (112).

[0174]

[0175] The tab organizing area (200) can be formed at a position corresponding to the electrode tab portion (TBA) based on the third direction (D3). Accordingly, when the electrode tab portion (TBA) is folded in the third direction (D3), the remaining portion (TBN) of the electrode tab portion (TBA) can be placed in the tab organizing area (200).

[0176] A portion of the elastic sheet (140) may be exposed in the tab cleaning area (200). Accordingly, the remaining portion (TBN) of the electrode tab portion (TBA) may be taped to the exposed portion of the elastic sheet (140).

[0177] Referring to FIG. 4b, a portion of the all-solid-state battery cell (10) may be exposed and positioned between a plurality of ribs (112). Accordingly, a portion of the elastic sheet (140) surrounding the all-solid-state battery cell (10) may also be exposed and positioned up to the portion where the plurality of ribs (112) are positioned.

[0178] Since a tapping area (200) is formed by being recessed between the multiple ribs (112), a portion of the elastic sheet (140) can be exposed through the tapping area (200).

[0179] Therefore, the remaining portion (TBN) of the electrode tab portion (TBA) can be taped to the elastic sheet (140) of the tab cleaning area (200).

[0180]

[0181] A plurality of tab organizing areas (200) may be formed on the can assembly (110). In an embodiment of the present invention, a plurality of tab organizing areas (200) may be formed corresponding to each of the plurality of electrode tab portions (TBA).

[0182] Referring to FIGS. 4b, 6c and 6d, the tab organization area (200) may include an upper tab organization area (210) and a lower tab organization area (220).

[0183] Multiple electrode tab sections (TBA) may be arranged in the first direction (D1). Multiple upper tab organizing areas (210) may be arranged in the first direction (D1) corresponding to the multiple electrode tab sections (TBA).

[0184] A number of lower tab organizing areas (220) may be arranged in the first direction (D1) corresponding to a plurality of electrode tab sections (TBA).

[0185] The upper tab organizing area (210) and the lower tab organizing area (220) can be arranged opposite each other on the can assembly (110) with respect to the third direction (D3).

[0186]

[0187] To increase electrical conductivity between the plurality of electrode tab portions (TBA) and the tab plate (130), the plurality of electrode tab portions (TBA) can be arranged as follows.

[0188] One of the multiple electrode tab portions (TBA) can be folded to bend upward.

[0189] For example, the first electrode tab portion (TBA1) may include a plurality of first electrode tab portions (TBA1). The plurality of first electrode tab portions (TBA1) may include a first sub-electrode tab portion (TBA11) and a second sub-electrode tab portion (TBA12).

[0190] The first sub-electrode tab portion (TBA11) can be bent upward and welded to the side plate (131). As disclosed in FIG. 7a, the first sub-electrode tab portion (TBA11) can be bent upward and aligned and welded to the side plate (131).

[0191] At this time, the remaining portion (TBN) of the first sub-electrode tab portion (TBA11) can be fixed to the upper tab organizing area (210) formed on the upper part of the all-solid-state battery cell (10). Specifically, it can be taped (TP) to the elastic sheet (140) of the upper tab organizing area (210).

[0192] The first sub-electrode tab portion (TBA11) may be an assembly of multiple electrode tabs (TB1 to TB5). All of the multiple electrode tabs (TB1 to TB5) may be welded to the side plate (131) of the tab plate (130).

[0193] At this time, some of the electrode tabs (TB3~TB5) among the plurality of electrode tabs (TB1~TB5) may be folded upward and welded to the side plate (131) without leaving a residual portion (TBN). When other electrode tabs (TB1~TB2) among the plurality of electrode tabs (TB1~TB5) are folded upward, the residual portion (TBN) may be extended further upward than the side plate (131), as disclosed in FIG. 8b.

[0194] Accordingly, some of the other electrode tabs (TB1~TB2) may include a connecting portion (TBR) that is welded to the side plate (131) and a remaining portion (TBN) that is not welded to the side plate (131).

[0195] The second sub-electrode tab portion (TBA12) can be bent downward and welded to the side plate (131). As disclosed in FIG. 7b, the second sub-electrode tab portion (TBA12) can be bent downward and positioned and welded to the side plate (131).

[0196] At this time, the remaining portion (TBN) of the second sub-electrode tab portion (TBA12) can be fixed to the lower tab organizing area (220) formed at the bottom of the all-solid-state battery cell (10). Specifically, it can be taped (TP) to the elastic sheet (140) of the lower tab organizing area (220).

[0197] The second sub-electrode tab portion (TBA12) may be an assembly of multiple electrode tabs (TB1 to TB5). All of the multiple electrode tabs (TB1 to TB5) may be welded to the side plate (131) of the tab plate (130).

[0198] Here, some of the electrode tabs (TB1~TB3) among the plurality of electrode tabs (TB1~TB5) may not have a residual portion (TBN) even if they are folded downward and welded to the side plate (131). Other electrode tabs (TB4~TB5) among the plurality of electrode tabs (TB1~TB5) may protrude further downward than the side plate (131) when folded downward. Therefore, the other electrode tabs (TB4~TB5) may include a connecting portion (TBR) welded to the side plate (131) and a residual portion (TBN) that is not welded to the side plate (131).

[0199] In summary, the plurality of electrode tabs (TB1~TB5) constituting the first sub-electrode tab section (TBA11) can be folded upward and welded to the side plate (131) of the tab plate (130). In this case, some of the electrode tabs (TB3~TB5) among the plurality of electrode tabs (TB1~TB5) can be stably energized to the side plate (131).

[0200] A plurality of electrode tabs (TB1~TB5) constituting the second sub-electrode tab section (TBA12) can be folded downward and welded to the side plate (131) of the tab plate (130). In this case, some of the electrode tabs (TB1~TB3) among the plurality of electrode tabs (TB1~TB5) can be stably energized to the side plate (131).

[0201] As described above, by folding the first sub-electrode tab portion (TBA11) and the first sub-electrode tab portion (TBA12) in opposite directions and welding them to the side plate (131) of the tab plate (130), all of the plurality of electrode tabs (TB1~TB5) can be stably connected to the tab plate (130). None of the electrode tabs (TB) can be disconnected.

[0202]

[0203] Referring to FIG. 5a and FIG. 9a to 10b, the all-solid-state battery (100) according to an embodiment of the present invention may further include a guide unit (300). The guide unit (300) can prevent the cap assembly (120) from tilting and being coupled to the front and rear parts of the can assembly (110) when the cap assembly (120) is coupled to the front and rear parts of the can assembly (110).

[0204] The guide unit (300) may include a first guide section (310) and a second guide section (320).

[0205] The first guide portion (310) may be disposed on the can assembly (110). Specifically, the first guide portion (310) may be formed on the rib (112) disposed on the front and rear portions of the can assembly (110).

[0206] The second guide portion (320) may be disposed on the cap assembly (120). Specifically, the second guide portion (320) may be formed inside the cap wall (128; see FIG. 9b and FIG. 10b).

[0207] In an embodiment of the present invention, one of the first guide part (310) or the second guide part (320) may include a guide slot (340) in a recessed shape, and the other may include a guide projection (330) in a protruding shape. When the can assembly (110) and the cap assembly (120) are joined together, the guide projection (330) may be inserted into the guide slot (340).

[0208] As the guide projection (330) is inserted into the guide slot (340) and moves in the second direction (D2), the cap assembly (120) can be positioned parallel to the can assembly (110) in the second direction (D2) and coupled. Thus, the cap assembly (120) can be coupled without tilting relative to the can assembly (110).

[0209] Hereinafter, the first guide part (310) is described in an embodiment in which the first guide part (310) includes a guide projection (330) and the second guide part (320) includes a guide slot (340). The description below can be equally applied to an embodiment in which the second guide part (320) includes a guide slot (340) and the first guide part (310) includes a guide projection (330).

[0210]

[0211] An embodiment of the first and second guide parts (310, 320) is disclosed in FIGS. 9a and 9b.

[0212] Referring to FIG. 9a, the first guide portion (310) may be formed on the rib (112). As described above, the rib (112) may include a plurality of ribs (112). The plurality of ribs (112) may include a side rib (112b) and a center rib (112a). The first guide portion (310) may be positioned on at least one of the side rib (112b) or the center rib (112a).

[0213] The first guide section (310) may include a plurality of first guide sections (310a, 310b, 310c, 310d).

[0214] A plurality of first guide sections (310a, 310b) can each be placed on a plurality of center ribs (112a).

[0215] Multiple first guide sections (310a, 310b) can be aligned at positions that match each other based on the first direction (D1).

[0216] Referring to FIG. 9a, a pair of center ribs (112a) may be arranged along the third direction (D3). And a pair of first guide sections (310a, 310b) may be arranged on the pair of center ribs (112a).

[0217] A pair of first guide sections (310a, 310b) can be aligned at positions corresponding to each other on a reference line (P11) on a pair of center ribs (112a).

[0218] A plurality of first guide sections (310c, 310d) can each be placed on a plurality of side ribs (112b).

[0219] Multiple first guide sections (310c, 310d) can be positioned at different locations based on the third direction (D3).

[0220] A pair of side ribs (112b) may be spaced apart from each other along a first direction (D1). A pair of first guide portions (310c, 310d) may be arranged on the pair of side ribs (112b). As described above, the first guide portion (310) may include a guide projection (330).

[0221] A pair of first guide sections (310c, 310d) can be positioned at different locations along the third direction (D3) on a pair of side ribs (112b).

[0222] Referring to FIG. 9a, one first guide member (310c) may be positioned on the side rib (112b) at a position corresponding to the reference line (P13). Another first guide member (310d) may be positioned on the side rib (112b) at a position corresponding to the reference line (P14).

[0223]

[0224] Referring to FIG. 9b, the second guide portion (320) may be formed on the cap wall (128) of the cap assembly (120). Specifically, the second guide portion (320) may be formed inside the cap wall (128).

[0225] The cap wall (128) may be arranged along the perimeter of the cap body (121). The cap wall (128) may protrude in the direction of the can assembly (110). A plurality of ribs (112) may be inserted into the interior of the cap wall (128). Accordingly, a first guide portion (310) arranged on the plurality of ribs (112) and a second guide portion (320) formed inside the cap wall (128) may be combined with each other.

[0226] The second guide section (320) may include a plurality of second guide sections (320a, 320b, 320c, 320d). The plurality of second guide sections (320a, 320b, 320c, 320d) may be positioned on surfaces facing each other inside the cap wall (128).

[0227] Multiple second guide sections (320a, 320b) can be aligned at positions that match each other based on the first direction (D1).

[0228] Referring to FIG. 9b, a pair of second guide sections (320a, 320b) may be disposed on the cap walls (128) positioned at the upper and lower parts of the cap body (121) along the third direction (D3).

[0229] A pair of second guide sections (320a, 320b) can be aligned at positions corresponding to each other on the reference line (P21) inside the cap wall (128).

[0230] A plurality of second guide portions (320c, 320d) may each be formed on a cap wall (128) disposed on both sides of the cap body (121) along the first direction (D1).

[0231] Multiple second guide sections (320c, 320d) can be positioned at different locations based on the third direction (D3).

[0232] A pair of second guide sections (320c, 320d) can be positioned at different locations along the third direction (D3) inside the cap wall (128).

[0233] Referring to FIG. 9b, one second guide part (320c) may be positioned on the cap wall (128) at a position corresponding to the reference line (P23). Another second guide part (320d) may be positioned on the cap wall (128) at a position corresponding to the reference line (P24).

[0234] Here, with respect to the first direction (D1), the reference line (P11) and the reference line (P21) can coincide with each other. Accordingly, the connection positions between the first guide parts (310a, 310b) and the second guide parts (320a, 320b) can coincide.

[0235] And with respect to the third direction (D3), the reference line (P13) and the reference line (P23) can coincide with each other. The reference line (P14) and the reference line (P24) can coincide with each other. Accordingly, the connection positions between the first guide parts (310c, 310d) and the second guide parts (320c, 320d) can coincide.

[0236] A guide projection (330) formed on a rib (112) of a can assembly (110) can be inserted into a guide slot (340) formed on a cap wall (128) of a cap assembly (120).

[0237] The first guide portions (310a, 310b) can be inserted into the second guide portions (320a, 320b). Since the guide projection (330) moves along the guide slot (340), it is possible to prevent the cap assembly (120) from tilting in the third direction (D3). In other words, it is possible to prevent the cap assembly (120) from forming a predetermined angle with respect to the third direction (D3).

[0238] The first guide portions (310c, 310d) can be inserted into the second guide portions (320c, 320d). Since the guide projection (330) moves along the guide slot (340), it is possible to prevent the cap assembly (120) from tilting in the first direction (D1). In other words, it is possible to prevent the cap assembly (120) from forming a predetermined angle with respect to the first direction (D1).

[0239] The cap assembly (120) can be moved in the second direction (D2) and connected to the front and rear portions of the can assembly (110), respectively. The cap assembly (120) can be connected to the front and rear portions of the can assembly (110), respectively, without tilting in the first and third directions (D1, D3). By doing so, the connection portions between the cap assembly (120) and the can assembly (110) can be in close contact with each other, and the welding quality can be improved during welding. In other words, by minimizing the assembly step difference between the cap assembly (120) and the can assembly (110), a stable welding area can be secured.

[0240] For example, referring to FIG. 13f, the joint portion (110w) of the can assembly (110) and the joint portion (120w) of the cap assembly (120) can be in close contact with each other. In other words, the assembly step difference between the joint portion (110w) of the can assembly (110) and the joint portion (120w) of the cap assembly (120) can be minimized. Since the joint portions (110w, 120w) between the cap assembly (120) and the can assembly (110) are in close contact with each other in the welding area (WP), welding can be performed smoothly with a laser welding device (LW), and the welding quality can be improved.

[0241]

[0242] FIGS. 10a and FIGS. 10b disclose other embodiments of the first and second guide parts (310, 320).

[0243] Referring to FIG. 10a, unlike the embodiment disclosed in FIG. 9a, a plurality of first guide portions (310a, 310b) disposed on a plurality of center ribs (112a) may be disposed at different positions with respect to a first direction (D1).

[0244] One first guide member (310a) may be positioned on the center rib (112a) at a position corresponding to the reference line (P11). Another first guide member (310b) may be positioned on the center rib (112a) at a position corresponding to the reference line (P12).

[0245] A plurality of first guide portions (310c, 310d) disposed on a plurality of side ribs (112b) may be disposed at different positions with respect to the third direction (D3).

[0246] One first guide member (310c) may be positioned on the side rib (112b) at a position corresponding to the reference line (P13). Another first guide member (310d) may be positioned on the side rib (112b) at a position corresponding to the reference line (P14).

[0247]

[0248] Referring to FIG. 10b, unlike the embodiment disclosed in FIG. 9b, a plurality of second guide portions (320a, 320b) positioned on the upper and lower parts of the cap wall (128) may be aligned at different positions with respect to the first direction (D1).

[0249] One second guide part (320a) may be positioned on the cap wall (128) at a position corresponding to the reference line (P21). Another second guide part (320b) may be positioned on the cap wall (128) at a position corresponding to the reference line (P22).

[0250] A plurality of second guide sections (320c, 320d) positioned on both sides of the cap wall (128) may be positioned at different locations based on the third direction.

[0251] One second guide part (320c) may be positioned on the cap wall (128) at a position corresponding to the reference line (P23). Another second guide part (320d) may be positioned on the cap wall (128) at a position corresponding to the reference line (P24).

[0252] Here, with respect to the first direction (D1), the reference line (P11) and the reference line (P21) can coincide with each other, and the reference line (P12) and the reference line (P22) can coincide with each other. Accordingly, the connection positions between the first guide parts (310a, 310b) and the second guide parts (320a, 320b) can coincide.

[0253] And based on the third direction (D3), the reference line (P13) and the reference line (P23) can coincide with each other, and the reference line (P14) and the reference line (P24) can coincide with each other. Therefore, the connection positions between the first guide parts (310c, 310d) and the second guide parts (320c, 320d) can coincide.

[0254] A guide projection (330) formed on a rib (112) of a can assembly (110) can be inserted into a guide slot (340) formed on a cap wall (128) of a cap assembly (120).

[0255] The first guide portions (310a, 310b) can be inserted into the second guide portions (320a, 320b). Since the guide projection (330) moves along the guide slot (340), it is possible to prevent the cap assembly (120) from tilting in the third direction (D3). In other words, it is possible to prevent the cap assembly (120) from forming a predetermined angle with respect to the third direction (D3).

[0256] The first guide portions (310c, 310d) can be inserted into the second guide portions (320c, 320d). Since the guide projection (330) moves along the guide slot (340), it is possible to prevent the cap assembly (120) from tilting in the first direction (D1). In other words, it is possible to prevent the cap assembly (120) from forming a predetermined angle with respect to the first direction (D1).

[0257] The cap assembly (120) can be moved in the second direction (D2) and connected to the front and rear portions of the can assembly (110), respectively. The cap assembly (120) can be connected to the front and rear portions of the can assembly (110), respectively, without tilting in the first and third directions (D1, D3). By doing so, the connection portions between the cap assembly (120) and the can assembly (110) can be in close contact with each other, and the welding quality can be improved during welding. In other words, by minimizing the assembly step difference between the cap assembly (120) and the can assembly (110), a stable welding area can be secured.

[0258]

[0259] Referring to FIG. 11a and FIG. 11b, the guide projection (330) according to an embodiment of the present invention can form a predetermined protrusion height (H1) and protrusion width (D1). The guide slot (340) can form a predetermined depression depth (H2) and depression width (D2).

[0260] In order for the guide projection (330) to be smoothly inserted into the guide slot (340), the size of the guide slot (340) may be formed to be equal to or larger than the size of the guide projection (330). In other words, the recess depth (H2) of the guide slot (340) may be formed to be equal to or larger than the protrusion height (H1) of the guide projection (330). The recess width (D2) of the guide slot (340) may be formed to be equal to or larger than the protrusion width (D1) of the guide projection (330).

[0261] In an embodiment of the present invention, the guide projection (330) may have a curved cross-section. The guide slot (340) may have a curved cross-section that is the same as or larger than that of the guide projection (330). When the guide projection (330) and the guide slot (340) have a curved shape, the guide projection (330) can be smoothly inserted into the guide slot (340).

[0262] However, the shape of the guide projection (330) and guide slot (340) is not limited to a curved cross-section, and may have a polygonal cross-section, for example.

[0263] Referring to FIG. 12a, a guide projection (330) having a curved cross-section as disclosed in FIG. 11a and FIG. 11b can be inserted into a guide slot (340) having a curved cross-section.

[0264] Referring to FIG. 12b, an inclined portion (331) may be formed at the end of the guide projection (330). When inserting the guide projection (330) into the guide slot (340), the end position of the guide projection (330) and the end position of the guide slot (340) may be slightly misaligned with respect to the third direction (D3). In this case, the guide projection (330) may not be inserted into the guide slot (340).

[0265] When an inclined portion (331) is formed at the end of the guide projection (330), even if the end position of the guide projection (330) and the end position of the guide slot (340) are slightly misaligned with respect to the third direction (D3), the end of the guide slot (340) moves along the inclined direction of the inclined portion (331), and the position of the guide slot (340) in the third direction (D3) can be adjusted. Accordingly, the positions of the guide projection (330) and the guide slot (340) in the third direction (D3) are aligned, and the guide projection (330) can be easily inserted into the guide slot (340).

[0266] Referring to FIG. 12c, a curved portion (333) may be formed at the end of the guide projection (330). When inserting the guide projection (330) into the guide slot (340), the end position of the guide projection (330) and the end position of the guide slot (340) may be slightly misaligned with respect to the third direction (D3). In this case, the guide projection (330) may not be inserted into the guide slot (340).

[0267] When a curved portion (333) is formed at the end of the guide projection (330), even if the end position of the guide projection (330) and the end position of the guide slot (340) are slightly misaligned with respect to the third direction (D3), the end of the guide slot (340) moves along the curved direction of the curved portion (333), and the position of the guide slot (340) in the third direction (D3) can be adjusted. Accordingly, the positions of the guide projection (330) and the guide slot (340) in the third direction (D3) are aligned, and the guide projection (330) can be easily inserted into the guide slot (340).

[0268]

[0269] Referring to FIGS. 13a to 13f, the guide unit (300) according to an embodiment of the present invention may further include a fixing part (350).

[0270] The fixing part (350) can be placed in the guide projection (330) and the guide slot (340). The fixing part (350) can fix the position of the guide projection (330) on the guide slot (340).

[0271] The fixed part (350) may include a fixed groove (353), a fixed projection (351), an elastic body (352), and a slot groove (355).

[0272] The fixed groove (353) can be formed by being recessed on the guide projection (330).

[0273] The fixing projection (351) can be placed in the fixing groove (353). The end (351a) of the fixing projection (351) may have a curved shape.

[0274] The elastic body (352) may be placed between the fixed groove (353) and the fixed projection (351). In an embodiment of the present invention, the elastic body (352) may be a coil spring, but is not necessarily limited thereto. For example, a leaf spring, an elastic pad, etc. may also be possible.

[0275] The slot groove (355) can be formed by being recessed into the guide slot (340). The end (351a) of the fixing projection (351) can be inserted into the slot groove (355).

[0276] Referring to FIGS. 13d and 13e, when the guide projection (330) is inserted into the guide slot (340), the fixing projection (351) protruding on the guide projection (330) can enter the interior of the fixing groove (353). At this time, the elastic body (352) may be in a compressed state.

[0277] Referring to FIG. 13f, when the guide projection (330) is fully inserted into the guide slot (340), the connecting portion (110w) of the can assembly (110) and the connecting portion (110w) of the cap assembly (120) can be closely aligned with each other. In other words, the assembly step difference between the connecting portion (110w) of the can assembly (110) and the connecting portion (120w) of the cap assembly (120) can be minimized.

[0278] At this time, the fixed projection (351) can be inserted into the slot groove (355). When the fixed projection (351) is positioned to coincide with the slot groove (355) based on the second direction (D2), the elastic body (352) is tensioned and the fixed projection (351) can be moved toward the slot groove (355).

[0279] As the fixed projection (351) is inserted into the slot groove (355), the position of the guide projection (330) can be fixed. Accordingly, the joint portion (110w) of the can assembly (110) and the joint portion (110w) of the cap assembly (120) can be maintained in close contact with each other on the welding area (WP), and the laser welding device (LW) can stably weld the joint portion (110w) of the can assembly (110) and the joint portion (110w) of the cap assembly (120). This can improve the welding quality between the can assembly (110) and the cap assembly (120).

[0280]

[0281] The configuration of the all-solid-state battery according to the embodiments of the present invention is as described above, and below, a method for manufacturing the all-solid-state battery (100) according to the embodiments of the present invention will be described.

[0282] The all-solid-state battery (100) described above can be manufactured through the manufacturing method of the all-solid-state battery (100). Therefore, the structure of the all-solid-state battery (100) may be included in the manufacturing method of the all-solid-state battery (100) even if it is not described below in the manufacturing method of the all-solid-state battery (100).

[0283] Referring to FIG. 14, a method for manufacturing an all-solid-state battery (100) according to embodiments of the present invention may include placing an all-solid-state battery cell (10) inside a can assembly (110) (S1), connecting an electrode tab portion (TBA) of the all-solid-state battery cell (10) to a tab plate (130) (S2), taping and placing a remaining portion (TBN) on the electrode tab portion (TBA) that is not connected to the tab plate (130) in a tab finishing area (200) (S3), and combining a cap assembly (120) with the can assembly (110) to form a case (101) (S4).

[0284] Placing a solid-state battery cell (10) inside the can assembly (110) (S1) can be done by wrapping the solid-state battery cell (10) with an elastic sheet (140) and accommodating the solid-state battery cell (10) while pressing it with the can assembly (110).

[0285] First, the perimeter surface of the all-solid-state battery cell (10) can be wrapped with an elastic sheet (140). An electrode tab portion (TBA) can be placed on the front and rear portions of the all-solid-state battery cell (10). The elastic sheet (140) can wrap the remaining portion of the all-solid-state battery cell (10), excluding the front and rear portions of the all-solid-state battery cell (10). Alternatively, the elastic sheet (140) can be placed only on the upper and lower portions of the all-solid-state battery cell (10).

[0286] As described above, the can assembly (110) may include a plurality of can bodies (111a, 111b). The plurality of can bodies (111a, 111b) are combined with each other and can accommodate an all-solid-state battery cell (10) inside. The plurality of can bodies (111a, 111b) can apply pressure to the upper and lower parts of the all-solid-state battery cell (10). In other words, with respect to the third direction (D3), the upper can body (111a) and the lower can body (111b) are combined with each other and apply surface pressure to the all-solid-state battery cell (10), and can accommodate the all-solid-state battery cell (10).

[0287] Additionally, the upper can body (111a) and the lower can body (111b) can form a can assembly (110) by welding the joint (111c). The welding method may be laser welding, but is not limited thereto.

[0288]

[0289] Connecting the electrode tab portion (TBA) of the above-mentioned all-solid-state battery cell (10) to the tab plate (130) (S2) may involve aligning a plurality of electrode tab portions (TBA) and welding a plurality of electrode tab portions (TBA) to the tab plate (130).

[0290] First, one of the plurality of electrode tab portions (TBA) can be aligned by bending it upward. Another of the plurality of electrode tab portions (TBA) can be aligned by bending it downward.

[0291] Referring to FIG. 4b, FIG. 7a and FIG. 7b, as described above, a plurality of electrode tabs (TB1 to TB5) constituting the first sub-electrode tab portion (TBA11) can be aligned to bend upward. A plurality of electrode tabs (TB1 to TB5) constituting the second sub-electrode tab portion (TBA12) can be aligned to bend downward.

[0292] According to the above alignment structure, during welding, some of the electrode tabs (TB3~TB5) among the plurality of electrode tabs (TB1~TB5) in the first sub-electrode tab section (TBA11) can be stably energized to the side plate (131). And in the second sub-electrode tab section (TBA12), some of the electrode tabs (TB1~TB3) among the plurality of electrode tabs (TB1~TB5) can be stably energized to the side plate (131).

[0293] By aligning the electrode tab portions (TBA) above, multiple electrode tabs (TB1~TB5) can all be stably energized to the tab plate (130) during welding.

[0294]

[0295] Multiple electrode tabs (TB) can be arranged in multiple layers along the third direction (D3). Therefore, in order to weld all the multiple electrode tabs (TB) to the tab plate (130), in step (S2), a weld (132) can be formed on the tab plate (130) in an up-and-down direction along the third direction (D3).

[0296] In addition, in the above step (S2), a plurality of welds (132) may be formed along the first direction (D1). The welding method may be laser welding, but is not limited thereto.

[0297] Referring to FIG. 4b, it can be seen that a weld (132) is formed lengthwise along the third direction (D3) and multiple welds (132) are formed along the first direction (D1). In step (S2), through the structure of the weld (132), all of the multiple electrode tabs (TB) can be stably energized to the side plate (131) of the tab plate (130).

[0298]

[0299] The arrangement (S3) of taping the remaining portion (TBN) that is not connected to the tab plate (130) on the electrode tab portion (TBA) to the tab finishing area (200) can be done by taping the remaining portion (TBN) that is not welded to the side plate (131) of the tab plate (130) among the electrode tabs (TB) constituting the electrode tab portion (TBA) to the elastic sheet (140).

[0300] Referring to FIG. 8a, a plurality of electrode tabs (TB) can be aligned to bend upward in order to weld them to the side plate (131). This can be done in step (S2). Accordingly, a plurality of electrode tabs (TB1 to TB5) can be arranged by bending upward.

[0301] Referring to FIG. 8b, a plurality of electrode tabs (TB) can be welded to a side plate (131) using a laser welding device (LW). This can be performed in step (S2).

[0302] Since the plurality of electrode tabs (TB) are aligned upward, the ends of some of the electrode tabs (TB3~TB5) among the plurality of electrode tabs (TB) can be welded to the side plate (131).

[0303] However, among the multiple electrode tabs (TB), some electrode tabs (TB1~TB2) are welded to the side plate (131), but the ends of some electrode tabs (TB1~TB2) are not welded to the side plate (131) and may be extended outward.

[0304] Referring to FIG. 8b, the ends of some other electrode tabs (TB1 to TB2) can be gathered together and taped (TP). This prevents the ends of some other electrode tabs (TB1 to TB2) from being short-circuited to the can assembly (110).

[0305] Referring to FIG. 8c, the ends of some other electrode tabs (TB1~TB2) that have been taped (TP) can be fixed to an elastic sheet (140).

[0306] As described above, the remaining portion (TBN) of the first sub-electrode tab portion (TBA11) disclosed in FIG. 7a can be fixed to the upper tab organizing area (210) formed at the bottom of the all-solid-state battery cell (10). In other words, it can be fixed by taping (TP) to the elastic sheet (140) of the upper tab organizing area (210).

[0307] And, the remaining portion (TBN) of the second sub-electrode tab portion (TBA12) disclosed in FIG. 7b can be fixed to the lower tab organizing area (220) formed at the bottom of the all-solid-state battery cell (10). In other words, it can be fixed by taping (TP) to the elastic sheet (140) of the lower tab organizing area (220).

[0308] Through the taping method described above, the remaining portion (TBN) of the electrode tab portion (TBA) can be organized inside the can assembly (110) without short-circuiting the can assembly (110).

[0309]

[0310] Forming a case (101) by joining the cap assembly (120) to the can assembly (110) (S4) can be achieved by guiding the cap assembly (120) by the rib (112) formed on the can assembly (110), thereby allowing the cap assembly (120) to be joined to the can assembly (110). The cap assembly (120) and the can assembly (110) can be joined to form a case (101).

[0311] Here, in the case of an embodiment including a guide unit (300) as disclosed in FIG. 5a, FIG. 9a to FIG. 10b, a guide projection (330) can be inserted into a guide slot (340). Thus, when the cap assembly (120) is coupled to the can assembly (110), problems such as tilting may not occur. This can increase the productivity of the prismatic all-solid-state battery (100) and improve the welding quality at the joint between the can assembly (110) and the cap assembly (120).

[0312] Additionally, in the case of an embodiment including the fixing part (350) disclosed in FIGS. 13a to 13f, the position of the guide projection (330) can be fixed as the fixing projection (351) is inserted into the slot groove (355). Accordingly, the joining part (110w) of the can assembly (110) and the joining part (110w) of the cap assembly (120) can be maintained in a state of close contact with each other. The laser welding device (LW) can stably weld the joining part (110w) of the can assembly (110) and the joining part (110w) of the cap assembly (120). This can improve the welding quality between the can assembly (110) and the cap assembly (120).

[0313] As the can assembly (110) and the cap assembly (120) are combined, the interior of the case (101) may form a receiving space (102) in which an all-solid-state battery cell (10) is received. The receiving space (102) may be sealed. The receiving space (102) may be formed in a vacuum state.

[0314] Referring to FIGS. 5a and 6b, the tab plate (130) may be located inside the cap assembly (120). At this time, to prevent the tab plate (130) and the cap assembly (120) from short-circuiting, the insulating block (127a) of the second insulating member (127) may come into contact with the side plate (131) and prevent the side plate (131) from moving in the second direction (D2). Additionally, the insulating rib (127b) of the second insulating member (127) may prevent contact with the cap body (121) even if the side plate (131) moves in the third direction (D3).

[0315] The electrode terminal (134) can be inserted into the terminal insertion hole (126c) of the first insulating member (126), and the electrode terminal (134) can be in contact with the terminal portion (122) and energized. Alternatively, a terminal hole (123) may be formed in the terminal portion (122), and the electrode terminal (134) may be exposed to the outside and connected to an external electrical wire.

[0316] Through the above step (S4), a solid battery (100) can be manufactured.

[0317] Other manufacturing processes may be added as needed after the above step (S4). Additionally, other manufacturing processes may be added as needed between the above steps (S1 to S4).

[0318]

[0319] The present invention allows the electrode tab (TB) of a solid-state battery cell (10) to be neatly arranged inside the case without contact with the case (101) during the manufacturing process of a prismatic solid-state battery (100) through the above-described configuration and manufacturing method. This prevents a short circuit from occurring between the case (101) and the electrode tab (TB) of the solid-state battery cell (10). As a result, stability during the manufacturing process can be increased and the defect rate can be reduced. This allows for the expectation of effects such as improving the productivity of the solid-state battery (100) manufacturing process and reducing manufacturing costs.

[0320] Although embodiments of the present invention have been described above with reference to the attached drawings, the present invention may be implemented in other specific forms without altering its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive.

Claims

1. A can assembly that accommodates an all-solid-state battery cell inside; A tab plate connected to the electrode tab portion of the above-mentioned all-solid-state battery cell; A cap assembly coupled to a can assembly; and Includes a tab finishing area formed by being recessed into the above can assembly; The electrode tab portion includes a connecting portion connected to the tab plate and a remaining portion not connected to the tab plate. The above remaining portion is placed in the above tab sorting area and is spaced apart from the above can assembly, an all-solid-state battery.

2. In Paragraph 1, The above can assembly is, A can body in which the above-mentioned all-solid-state battery cell is accommodated; and A plurality of ribs arranged along the end perimeter of the above can body; including The above cap assembly is coupled to the plurality of ribs, and The above tab organization area is formed between the plurality of ribs, in an all-solid-state battery.

3. In Paragraph 2, It further includes an elastic sheet disposed between the above-mentioned all-solid-state battery cell and the above-mentioned can assembly, and The above elastic sheet includes an insulating material, and A portion of the elastic sheet is exposed through the above tab cleaning area, and A solid-state battery in which the remaining portion of the electrode tab is taped and fixed to the exposed portion of the elastic sheet.

4. In Paragraph 1, The electrode tab portion comprises a plurality of electrode tab portions arranged along a first direction (D1) on the all-solid-state battery cell, and The above-mentioned tab cleaning area is formed at a position corresponding to the electrode tab portion based on the third direction (D3), and The above-mentioned tab cleaning region comprises a plurality of tab cleaning regions corresponding to each of the plurality of electrode tab portions, in an all-solid-state battery.

5. In Paragraph 4, The above tab organization area is An upper tab organizing area disposed on the upper part of the above can assembly; and A lower tab organizing area disposed at the bottom of the above-mentioned can assembly; including A solid-state battery in which, based on the third direction (D3), the upper tab organizing area and the lower tab organizing area are arranged opposite each other on the can assembly.

6. In Paragraph 5, Based on the third direction (D3), One of the plurality of electrode tab portions is bent upward and placed in the upper tab organizing area, and All-solid-state battery, wherein another of the plurality of electrode tab portions is bent downward and disposed in the lower tab organizing area.

7. In Paragraph 1, The above cap assembly is, A cap body coupled to the above can assembly; A terminal portion disposed in the central part of the above-mentioned cap body, said terminal portion is energized to the above-mentioned tab plate; and Including an insulating part disposed on the above-mentioned cap body; The above insulating part is, A first insulating member disposed between the above-mentioned cap body and the above-mentioned terminal portion; and A second insulating member disposed between the cap body and the tab plate; comprising The first insulating member blocks current flow between the cap body and the terminal part, and The above-described second insulating member is configured to block current flow between the cap body and the tab plate, in a solid-state battery.

8. In Paragraph 7, The above tab plate is, Electrode terminals that conduct electricity to the above terminal portion; A plate-shaped center plate on which the above electrode terminals are arranged; and Includes a side plate connected to the center plate; The above side plate is connected to both sides of the center plate along the first direction (D1), and The above electrode tab portion is connected to the side plate, an all-solid-state battery.

9. In Paragraph 8, The first insulating member above is, An insulating plate disposed inside the above-mentioned cap body; A terminal insertion hole formed in the insulating plate; and Including an insulating line disposed between the above-mentioned cap body and the above-mentioned terminal part; The electrode terminal is inserted into the terminal insertion hole above. The above insulation line is connected to the insulation plate, and the insulation line is configured to insulate the cap body and the terminal part. The above second insulating member is, Insulating blocks disposed on both sides of the insulating plate along the first direction (D1) inside the cap body; and Insulating ribs arranged along the inner circumference of the above-mentioned cap body; including The above insulating rib is connected to the above insulating block, and A solid-state battery in which the insulating block and the insulating rib are configured to block current flow between the tab plate and the cap body.

10. A can assembly that accommodates an all-solid-state battery cell inside; A cap assembly coupled to the above can assembly; and A guide unit that guides the coupling of the can assembly and the cap assembly; is included. The above guide unit is, A first guide portion disposed on the above-mentioned can assembly; and A second guide portion disposed on the above-mentioned cap assembly; comprising One of the first guide part or the second guide part includes a guide slot in a recessed shape, and the other includes a guide projection in a protruding shape. A solid-state battery in which the above guide projection is inserted into the above guide slot.

11. In Paragraph 10, The above can assembly is, A can body accommodating the above-mentioned all-solid-state battery cell; and Includes ribs arranged along the end perimeter of the above can body, The above rib protrudes in the direction of the cap assembly, and The above first guide portion is formed on the rib, in a solid-state battery.

12. In Paragraph 11, The above rib includes a plurality of ribs, and A plurality of side ribs disposed on both sides of the end of the above can assembly; and A plurality of center ribs disposed between the plurality of side ribs at the end of the can assembly; comprising The above-described first guide portion is disposed on at least one of the side rib or the center rib, in an all-solid-state battery.

13. In Paragraph 12, The above-mentioned first guide section includes a plurality of first guide sections, and The above plurality of first guide parts are each disposed on the above plurality of center ribs, and The above plurality of first guide parts are arranged at positions that coincide with each other based on the first direction, and The plurality of first guide parts are each disposed on the plurality of side ribs, and A solid-state battery in which the above plurality of first guide parts are arranged at different positions based on a third direction.

14. In Paragraph 13, The above cap assembly is, Cap body on which the terminal section is placed; An insulating portion disposed between the above-mentioned cap body and the above-mentioned terminal portion; and Cap walls arranged along the perimeter of the above-mentioned cap body; including The above cap wall protrudes in the direction of the can assembly, and the rib is inserted into the interior of the cap wall. The above second guide portion is disposed inside the cap wall of the all-solid-state battery.

15. In Paragraph 14, The above-mentioned second guide section includes a plurality of second guide sections, and The plurality of second guide parts are disposed on surfaces facing each other inside the cap wall, and The above plurality of second guide parts are arranged at positions that coincide with each other based on the first direction, and A solid-state battery in which the plurality of second guide sections are positioned at different locations based on a third direction.

16. Placing an all-solid-state battery cell inside a can assembly; Connecting the electrode tab portion of the above-mentioned all-solid-state battery cell to the tab plate; Placing the remaining portion on the electrode tab portion that is not connected to the tab plate in the tab finishing area by taping it; and Forming a case by joining a cap assembly to the can assembly; including A method for manufacturing an all-solid-state battery, wherein the above-mentioned remaining portion is placed in the above-mentioned tab cleaning area and spaced apart from the above-mentioned can assembly.

17. In Paragraph 16, A plurality of ribs are arranged on the above can assembly, and The above tab cleaning area is formed between the plurality of ribs, and The above-mentioned tab organizing area is positioned between the plurality of ribs at a location corresponding to the electrode tab portion, and The electrode tab portion comprises a plurality of electrode tab portions arranged along a first direction (D1) on the all-solid-state battery cell, and A method for manufacturing an all-solid-state battery, wherein the above-mentioned tab cleaning area comprises a plurality of tab cleaning areas corresponding to each of the plurality of electrode tab portions.

18. In Paragraph 17, One of the plurality of electrode tab portions is bent upward and placed in the tab organizing area, and A method for manufacturing an all-solid-state battery, wherein one of the plurality of electrode tab portions is bent downward and disposed in the tab sorting area.

19. In Paragraph 18, Placing an all-solid-state battery cell inside the above-mentioned can assembly is, The above can assembly includes a plurality of can bodies, and The plurality of can bodies are combined with each other while applying pressure to the upper and lower parts of the all-solid-state battery cell, and Connecting the electrode tab portion of the above-mentioned all-solid-state battery cell to the tab plate is, The above electrode tab portion includes a plurality of electrode tabs arranged in a plurality of layers along a third direction (D3), and A method for manufacturing an all-solid-state battery, wherein a plurality of electrode tabs are welded to the tab plate, a weld portion is formed along a third direction (D3) on the tab plate, and a plurality of weld portions are formed along a first direction (D1).

20. In Paragraph 16, An elastic sheet is disposed between the above-mentioned all-solid-state battery cell and the above-mentioned can assembly, and A portion of the elastic sheet is exposed through the above tab cleaning area, and The above elastic sheet includes an insulating material, and A method for manufacturing an all-solid-state battery, wherein the remaining portion of the electrode tab portion is fixed by taping to the exposed portion of the elastic sheet.

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