Apparatus for manufacturing secondary battery and method for manufacturing secondary battery

Abstract

The present invention relates to a method for manufacturing a secondary battery and, more specifically, to a method for manufacturing a secondary battery, the method comprising: forming a first electrode body; forming a first pattern portion on the first electrode body along a traveling direction (D1); stacking a gasket on the first electrode body; stacking a counter electrode body inside the gasket on the first electrode body, wherein the first electrode body and the counter electrode body have different polarities; forming a second electrode body, wherein the first and second electrode bodies have the same polarity; forming a second pattern portion on the second electrode body along the traveling direction (D1); bonding the first electrode body, the counter electrode body, and the second electrode body; measuring the alignment state between the first and second pattern portions and aligning the traveling positions of the first and second electrode bodies; and notching the first and second electrode bodies.

Description

Secondary battery manufacturing apparatus and secondary battery manufacturing method

[0001] The present invention relates to a secondary battery manufacturing apparatus and a secondary battery manufacturing method, and more specifically, to a secondary battery manufacturing apparatus and a secondary battery manufacturing method capable of precisely controlling the alignment state of a plurality of electrode bodies during the manufacturing process of a battery cell.

[0002]

[0003] Recently, accompanied by the rapid proliferation of battery-powered electronic devices such as mobile phones, laptop computers, and electric vehicles, the demand for high-energy-density, high-capacity rechargeable batteries is rapidly increasing. Accordingly, research and development to improve the performance of lithium-ion batteries is actively underway.

[0004] Recently, all-solid-state batteries, in which liquid electrolytes are replaced 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 pressurizing and densifying them; 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 even in the event of a short circuit. Consequently, these all-solid-state batteries can possess high stability.

[0005] In the manufacturing process of secondary batteries, the bi-cell form is a structure in which identical electrodes are stacked on the top and bottom and different electrodes are stacked in between; therefore, to improve the productivity of secondary batteries, it is necessary to be able to manufacture bi-cells precisely using a continuous process.

[0006]

[0007] The problem that the present invention aims to solve is to provide a secondary battery manufacturing apparatus and a secondary battery manufacturing method capable of precisely controlling the alignment state of a plurality of electrode bodies during the manufacturing process of a battery cell.

[0008]

[0009] According to the concept of the present invention, a secondary battery manufacturing apparatus comprises: a first electrode supply unit for supplying a first electrode body; a gasket forming unit for laminating a gasket on the first electrode body; a counter electrode supply unit for laminating a counter electrode body on the inside of the gasket on the first electrode body; a second electrode supply unit for supplying a second electrode body on the first electrode body and the counter electrode body; a joining unit for joining the first electrode body, the counter electrode body, and the second electrode body; a notching unit for notching the first and second electrode bodies; and an alignment control unit for aligning the driving positions of the first and second electrode bodies; wherein the alignment control unit may include: a pattern forming unit for forming a first pattern part and a second pattern part along a driving direction (D1) on the first electrode body and the second electrode body, respectively; and a position measuring unit for measuring the alignment state between the first and second pattern parts and measuring the alignment state between the first and second electrode bodies.

[0010] A method for manufacturing a secondary battery according to the concept of the present invention may include: forming a first electrode body; forming a first pattern portion along a driving direction (D1) on the first electrode body; stacking a gasket on the first electrode body; stacking a counter electrode body on the inside of the gasket on the first electrode body, wherein the first electrode body and the counter electrode body have different polarities; forming a second electrode body, wherein the first and second electrode bodies have the same polarity; forming a second pattern portion along a driving direction (D1) on the second electrode body; joining the first electrode body, the counter electrode body, and the second electrode body; measuring the alignment state between the first and second pattern portions to align the driving positions of the first and second electrode bodies; and notching the first and second electrode bodies.

[0011]

[0012] The secondary battery manufacturing apparatus and secondary battery manufacturing method according to the present invention can precisely measure the alignment state between a plurality of electrode bodies during a continuous manufacturing process of a battery cell. And the alignment position between a plurality of electrode bodies can be precisely adjusted.

[0013] In addition, the alignment state between the gasket and the electrode placed inside the gasket can be precisely measured during the continuous manufacturing process of the battery cell. And the driving position of the electrode can be precisely adjusted.

[0014] This can improve the productivity of secondary batteries.

[0015]

[0016] FIG. 1 is a cross-sectional view of an all-solid-state battery cell according to embodiments of the present invention.

[0017] FIG. 2a is a perspective view of a bi-cell according to embodiments of the present invention.

[0018] FIG. 2b is a cross-sectional view of the AA' portion disclosed in FIG. 2a.

[0019] Figure 3 is an exploded view of the bicell disclosed in Figure 2a.

[0020] FIGS. 4 and 5 are schematic diagrams for explaining a secondary battery manufacturing apparatus according to embodiments of the present invention.

[0021] FIG. 6 is a drawing for explaining a first electrode supply unit and a first pattern forming unit according to embodiments of the present invention.

[0022] FIG. 7a is a drawing for explaining a gasket molding part and a gasket measuring sensor according to embodiments of the present invention.

[0023] FIG. 7b is a front view illustrating the gasket forming roller disclosed in FIG. 7a.

[0024] FIG. 7c is a schematic cross-sectional view illustrating the tank disclosed in FIG. 7a.

[0025] FIG. 8a is a drawing for explaining a counter electrode supply unit and an insert sensing unit according to embodiments of the present invention.

[0026] FIG. 8b is a diagram illustrating the state in which an insert sensing unit according to embodiments of the present invention measures the alignment state between a gasket and a counter electrode.

[0027] FIG. 9 is a drawing for explaining a second electrode supply unit and a second pattern forming unit according to embodiments of the present invention.

[0028] FIG. 10 is a drawing for explaining a joint and a joint measurement sensor according to embodiments of the present invention.

[0029] FIG. 11 is a drawing for explaining the state of measuring the alignment state between the first and second pattern parts according to embodiments of the present invention.

[0030] FIGS. 12a to 12e are drawings for explaining a notching portion according to embodiments of the present invention.

[0031] FIG. 13 is a schematic control diagram for explaining a method for manufacturing a secondary battery according to embodiments of the present invention.

[0032] FIGS. 14a to 14d are detailed control diagrams for explaining a method for manufacturing a secondary battery according to embodiments of the present invention.

[0033] FIG. 15 is a control configuration diagram for explaining an alignment control unit according to embodiments of the present invention.

[0034]

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039]

[0040] FIG. 1 discloses a unit cell shape of an all-solid-state battery cell (10) according to embodiments of the present invention.

[0041] 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).

[0042] 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.

[0043] 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.

[0044] 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).

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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).

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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).

[0060] 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.

[0061] 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.

[0062] 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 electrode active material layer (23) or the binder included in the negative electrode coating layer (33).

[0063] The negative electrode layer (30) may include a negative electrode current collector (31) and a negative electrode coating layer (33) on the negative electrode current collector (31). The negative electrode current collector (31) may provide a reference surface on which the negative electrode 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.

[0064] 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.

[0065] The negative electrode coating layer (33) can allow lithium metal to grow between the all-solid-state battery cell (10) and the negative electrode current collector (31) during charging. The negative electrode coating layer (33) can serve as a protective layer for the lithium metal and simultaneously suppress the precipitation and growth of lithium dendrites.

[0066] The cathode coating layer (33) may include metal and carbon. For example, the cathode 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 cathode 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 cathode coating layer (33) may include a mixture of carbon black and silver (Ag).

[0067] The cathode coating layer (33) may further include other additives in addition to metal and carbon. The cathode 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.

[0068] The negative electrode coating layer (33) may have a smaller thickness compared to the positive electrode active material layer (23). The thickness of the negative electrode 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 electrode active material layer (23). The thickness of the negative electrode 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 negative electrode coating layer (33) is excessively thin, lithium dendrites formed between the negative electrode coating layer (33) and the negative electrode current collector (31) may cause the negative electrode coating layer (33) to collapse, thereby degrading the cycle characteristics of the all-solid-state battery cell (10). If the thickness of the negative electrode 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 negative electrode coating layer (33) increases, which may degrade the cycle characteristics of the all-solid-state battery cell (10).

[0069] Meanwhile, although not shown, a carbon layer may be further included to improve adhesion between the cathode coating layer (33) and the solid electrolyte layer (40).

[0070]

[0071] FIGS. 2a to 3 disclose a bi-cell according to embodiments of the present invention.

[0072] A bi-cell can be defined as a secondary battery in which the electrodes at both ends are identical. Furthermore, a bi-cell only requires that the electrodes at both ends be identical, and there may be no limit to the number of stacked electrode layers and solid electrolyte layers.

[0073] Referring to FIGS. 2a to 3, the bicell (BC) may be in the form of a first electrode layer (EL1), a first membrane (ML1), a counter electrode (OE), a second membrane (ML2), and a second electrode layer (EL2) stacked sequentially.

[0074] The first electrode layer (EL1) and the second electrode layer (EL2) can form the same electrode. The counter electrode (OE) can form a different electrode from the first electrode layer (EL1) and the second electrode layer (EL2).

[0075] For example, if the first and second electrode layers (EL1, EL2) are negative electrode layers, the counter electrode (OE) may be an anode layer. Conversely, if the first and second electrode layers (EL1, EL2) are positive electrode layers, the counter electrode (OE) may be a negative electrode layer.

[0076] In the embodiments of the present invention below, the first and second electrode layers (EL1, EL2) are described as negative electrode layers, and the counter electrode (OE) is described as positive electrode layer.

[0077] The first electrode layer (EL1) may include a first electrode substrate (EL11), a first electrode active material layer (EL12), and a first electrode tab (EL13). The second electrode layer (EL2) may include a second electrode substrate (EL21), a second electrode active material layer (EL22), and a second electrode tab (EL23). The first and second electrode substrates (EL11, EL21) may be negative electrode current collectors (31), and the first and second electrode active material layers (EL12, EL22) may be coating layers (33).

[0078] The counter electrode body (OE) may include a counter electrode substrate (OE1), a counter electrode active material layer (OE2), a counter electrode tab (OE3), and an insulating tape (OE4). The counter electrode substrate (OE1) may be a positive current collector (21), and the counter electrode active material layer (OE2) may be a positive active material layer (23).

[0079] The counter electrode (OE) can be formed with a size smaller than the first and second electrode layers (EL1, EL2). The counter electrode (OE) can be laminated on the inner side of the gasket (GK).

[0080] Insulating tape (OE4) can be placed on the counter electrode tab (OE3) by coating or taping, etc., during the process to prevent the counter electrode tab (OE3) from being grounded to the second electrode layer (EL2) when the counter electrode tab (OE3) is laminated on the gasket (GK).

[0081] The first membrane (ML1) and the second membrane (ML2) may be a solid electrolyte or a separator.

[0082] In the following, the first electrode body (EA1) may be defined as a laminate comprising a first membrane (ML1) and a first electrode layer (EL1). The second electrode body (EA2) may be defined as a laminate comprising a second membrane (ML2) and a second electrode layer (EL2).

[0083] In the case where the secondary battery according to the embodiments of the present invention is an all-solid-state battery, the first membrane (ML1) may be a solid electrolyte. It may correspond to the solid electrolyte layer (40) disclosed in FIG. 1.

[0084] In the case where the secondary battery according to the embodiments of the present invention is a lithium-ion battery, the first membrane (ML1) may be a separator, and the gasket (GK) may be omitted.

[0085] In other words, the secondary battery manufacturing device (100) according to the embodiments of the present invention may be a manufacturing device for an all-solid-state battery or a manufacturing device for a lithium-ion battery depending on the types of the first and second membranes (ML1, ML2).

[0086] The above-described bicell (BC) can be manufactured through the secondary battery manufacturing device (100) and secondary battery manufacturing method described below.

[0087]

[0088] Referring to FIGS. 4 to 12e, a secondary battery manufacturing apparatus (100) according to embodiments of the present invention may include a first electrode supply unit (200), a gasket forming unit (300), a counter electrode supply unit (400), a second electrode supply unit (500), a bonding unit (600), a notching unit (700), a magazine unit (810), and an alignment control unit (900).

[0089] Referring to FIGS. 4 and 6, the first electrode supply unit (200) can supply a first electrode body (EA1). The first electrode supply unit (200) may include a first electrode reel (210), a first membrane supply unit (220), a first bonding roller (230), a first guide roller (250), and a first adjustment unit (260).

[0090] A first electrode layer (EL1) may be wound on the first electrode reel (210). When the first electrode reel (210) rotates, the first electrode layer (EL1) is unwound and the first electrode layer (EL1) can be supplied to the first bonding roller (230).

[0091] In embodiments of the present invention, the first electrode layer (EL1) may be a cathode layer. When the first electrode layer (EL1) is a cathode layer, the first electrode layer (EL1) may include a cathode current collector (or cathode substrate) and a coating layer (or cathode active material layer).

[0092] Alternatively, the first electrode layer (EL1) may be an anode layer. If the first electrode layer (EL1) is an anode layer, the first electrode layer (EL1) may include an anode current collector (or anode substrate) and an anode active material layer.

[0093] In the embodiments of the present invention below, the first electrode layer (EL1) is described as being limited to a negative electrode layer.

[0094] Referring to FIG. 4, a first feeding roller (211) may be disposed between the first electrode reel (210) and the first bonding roller (230). The first feeding roller (211) can guide the transport of the first electrode layer (EL1) from the first electrode reel (210) toward the first bonding roller (230).

[0095] The first membrane supply unit (220) can supply the first membrane (ML1) to the first bonding roller (230). The first membrane supply unit (220) may be in the form of a reel. When the reel rotates, the first membrane (ML1) is unwound, and the first membrane (ML1) can be supplied to the first bonding roller (230). However, it is not limited to a reel structure, and other supply structures are also possible.

[0096] The first membrane (ML1) may be a solid electrolyte or a separator.

[0097] In the case where the secondary battery according to the embodiments of the present invention is an all-solid-state battery, the first membrane (ML1) may be a solid electrolyte.

[0098] In the case where the secondary battery according to the embodiments of the present invention is a lithium-ion battery, the first membrane (ML1) may be a separator.

[0099] In other words, the secondary battery manufacturing device (100) according to the embodiments of the present invention may be a manufacturing device for an all-solid-state battery or a manufacturing device for a lithium-ion battery depending on the type of the first membrane (ML1).

[0100] The first bonding roller (230) can bond or laminate the first electrode layer (EL1) and the first membrane (ML1). The first bonding roller (230) can press the first electrode layer (EL1) and the first membrane (ML1) to bond the first membrane (ML1) onto the first electrode layer (EL1). At this time, a heating process may be included to increase the bonding strength if necessary during the pressing process through the first bonding roller (230).

[0101] A first membrane (ML1) can be placed on top of a first electrode layer (EL1) based on the vertical direction (D3).

[0102] The first electrode layer (EL1) and the first membrane (ML1) can be bonded to form the first electrode body (EA1).

[0103] The first guide roller (250) may be positioned between the first joining roller (230) and the gasket forming section (300). The first guide roller (250) may guide the transport of the first electrode body (EA1) from the first joining roller (230) toward the gasket forming section (300). Multiple first guide rollers (250) may be positioned. Referring to FIG. 4, in embodiments of the present invention, two may be positioned, but are not necessarily limited thereto.

[0104] Referring to FIG. 4, the first adjustment unit (260) may be positioned between a plurality of first guide rollers (250). The first adjustment unit (260) can adjust the alignment state of the first electrode body (EA1).

[0105] In embodiments of the present invention, the first adjustment unit (260) may be an adjustment roller device capable of multi-directional adjustment. Although not illustrated in the drawings, the adjustment roller device may be connected to a driving means. The adjustment roller device may be a roller device capable of adjusting the position in multiple directions while supporting the first electrode body (EA1). The first adjustment unit (260) may adjust the position along the horizontal direction (D2) and the vertical direction (D3), and may adjust the position by rotating on a plane (D1-D2).

[0106] The first adjustment unit (260) moves in the vertical direction (D3) and can adjust the tension of the first electrode body (EA1). The first adjustment unit (260) moves in the horizontal direction (D2) and can adjust the driving position according to the width direction of the first electrode body (EA1). The first adjustment unit (260) rotates on a plane (D1-D2) and can adjust the alignment angle according to the driving direction (D1) of the first electrode body (EA1).

[0107] Meanwhile, the driving speed of the first electrode body (EA1) can be adjusted through the unwinding rotation speed of the first electrode reel (210) and the unwinding rotation speed of the first membrane supply unit (220).

[0108] However, in the embodiments of the present invention, the first adjustment unit (260) is not limited to the adjustment roller device described above and may include a position adjustment device of a different structure capable of adjusting the alignment state of the first electrode body (EA1).

[0109]

[0110] Referring to FIGS. 4 and FIGS. 7a to 7b, the gasket forming section (300) can laminate a gasket (GK) on a first electrode body (EA1). The gasket forming section (300) may include a gasket forming roller (310), a gasket forming groove (311), a tank (320), and a support roller (330).

[0111] The material of the gasket (GK) may be the same material as the first and second membranes (ML1, ML2) or may be a paper or polymer material having insulating properties.

[0112] The gasket forming roller (310) may include a roller body (313) and a gasket forming groove (311). The roller body (313) may generally be cylindrical in shape. The gasket forming groove (311) may be formed by being recessed into the surface of the roller body (313).

[0113] In embodiments of the present invention, the counter electrode (OE) may be provided in a square shape. The counter electrode (OE) may be laminated on the inner side of the gasket (GK). In order for the counter electrode (OE) to be stably laminated on the inner side of the gasket (GK), the gasket forming groove (311) in embodiments of the present invention may be in a square shape. However, the shape of the gasket forming groove (311) is not limited to the above shape and may be changed in correspondence with the shape of the counter electrode (OE).

[0114] The tank (320) may be positioned adjacent to the gasket forming roller (310). Gasket raw material may be stored inside the tank (320). The tank (320) may supply gasket raw material to the gasket forming groove (311).

[0115] When the gasket forming roller (310) comes into contact with the surface of the first electrode body (EA1), the gasket (GK) formed in the gasket forming groove (311) can be laminated onto the surface of the first electrode body (EA1). Referring to FIG. 7a, a state in which a square-shaped gasket (GK) is laminated on the first electrode body (EA1) can be observed.

[0116] The support roller (330) can be positioned opposite the gasket forming roller (310) with respect to the vertical direction (D3). The support roller (330) can support the lower part of the first electrode body (EA1) while the gasket forming roller (310) forms a gasket (GK) on the first electrode body (EA1).

[0117]

[0118] Referring to FIGS. 4, FIGS. 8a and FIGS. 8b, the counter electrode supply unit (400) can laminate a counter electrode body (OE) on the inner side of a gasket (GK) on a first electrode body (EA1). The counter electrode supply unit (400) may include an insert guide (410) and an insert roller (420).

[0119] The insert guide (410) may include an upper insert (411) and a lower insert (413). A gap corresponding to the vertical height of the counter electrode (OE) may be formed between the upper insert (411) and the lower insert (413). The counter electrode (OE) is inserted into the gap and its movement direction may be guided toward the inner side of the gasket (GK). The counter electrode (OE) is discharged from the insert guide (410) and may be stacked on the inner side of the gasket (GK). In an embodiment of the present invention, the insert guide (410) may be a friction feeder. For example, the upper insert (411) and the lower insert (413) may be of a belt type, and the belt may rotate to transport the counter electrode (OE). However, the insert guide (410) is not necessarily limited to this and may include other feeding forms.

[0120] The insert roller (420) can bond or laminate a counter electrode (OE) onto a first electrode (EA1). Strictly speaking, it can bond or laminate a counter electrode (OE) onto a first membrane (ML1) of the first electrode (EA1). The insert roller (420) can press the first electrode (EA1) and the counter electrode (OE) to bond the counter electrode (OE) onto the first electrode (EA1). At this time, a heating process may be included during the pressurization process through the insert roller (420) to increase the bonding strength if necessary.

[0121] In embodiments of the present invention, the counter electrode (OE) may be an anode layer. When the counter electrode (OE) is a cathode layer, the counter electrode (OE) may include an anode current collector (or anode substrate) and an anode active material layer.

[0122] Alternatively, the counter electrode (OE) may be a negative electrode layer. If the counter electrode (OE) is a negative electrode layer, the counter electrode (OE) may include a negative current collector (or negative electrode substrate) and a coating layer (or negative active material layer).

[0123] As described above, since the first electrode layer (EL1) is limited to the negative electrode layer, the counter electrode (OE) will be described as limited to the positive electrode layer in the embodiments of the present invention below.

[0124] The counter electrode body (OE) applied in the embodiments of the present invention may include a counter electrode tab (OE3) and an insulating tape (OE4). Accordingly, when the counter electrode body (OE) is laminated on the inner side of the gasket (GK), the counter electrode tab (OE3) may protrude outward beyond the upper part of the gasket (GK). Referring to FIG. 8a, the counter electrode tab (OE3) may protrude in the width direction (D2) beyond the upper part of the gasket (GK).

[0125] The insulating tape (OE4) can be attached to the counter electrode tab (OE3). When the counter electrode tab (OE3) protrudes outward beyond the gasket (GK), the insulating tape (OE4) can be positioned on the gasket (GK). The insulating tape (OE4) can prevent current flow between the counter electrode tab (OE3) and the second electrode body (EA2).

[0126] Since the insulating tape (OE4) is positioned on top of the gasket (GK), even if the second electrode body (EA2) is laminated on the gasket (GK) and the counter electrode body (OE), the conduction between the counter electrode body (OE) and the second electrode body (EA2) can be blocked.

[0127] In the absence of insulating tape (OE4), a process of laminating a gasket (GK) once more on the upper part of the counter electrode tab (OE3) may be added to prevent the counter electrode tab (OE3) from being electrically connected to the second electrode body (EA2).

[0128] At this time, the lower part of the counter electrode tab (OE3) can be blocked from communicating with the first electrode body (EA1) by the gasket (GK).

[0129] The gasket (GK) can fill the step space formed on the outer edge of the counter electrode (OE), which has a smaller area compared to the first electrode (EA1). In the pressurization process for densifying the all-solid-state battery after bicell fabrication, the gasket (GK) can prevent bending and cracking of the first electrode (EA1). As described above, the counter electrode (OE) may be a positive electrode layer (20), and the first electrode (EA1) may be a negative electrode layer (30).

[0130]

[0131] Referring to FIGS. 4 and 9, the second electrode supply unit (500) can supply a second electrode body (EA2) onto a first electrode body (EA1) and a counter electrode body (OE). The second electrode supply unit (500) may include a second electrode reel (510), a second feeding roller (511), a second membrane supply unit (520), a second bonding roller (530), a second guide roller (560), and a second adjustment unit (570).

[0132] A second electrode layer (EL2) may be wound on the second electrode reel (510). When the second electrode reel (510) rotates, the second electrode layer (EL2) is unwound and the second electrode layer (EL2) can be supplied to the second bonding roller (530).

[0133] In embodiments of the present invention, the second electrode layer (EL2) may be a cathode layer. When the second electrode layer (EL2) is a cathode layer, the second electrode layer (EL2) may include a cathode current collector (or cathode substrate) and a coating layer (or cathode active material layer).

[0134] Alternatively, the second electrode layer (EL2) may be an anode layer. If the second electrode layer (EL2) is an anode layer, the second electrode layer (EL2) may include an anode current collector (or anode substrate) and an anode active material layer.

[0135] As described above, since the first electrode layer (EL1) is limited to a negative electrode layer and the counter electrode layer is limited to an anode layer, the second electrode layer (EL2) will be described as a negative electrode layer in the embodiments of the present invention below.

[0136] Accordingly, the first and second electrode layers (EL1, EL2) or the first and second electrode bodies (EA1, EA2) may have the same polarity. The counter electrode body (OE) may have a different polarity from the first and second electrode layers (EL1, EL2).

[0137] The second feeding roller (511) may be positioned between the second electrode reel (510) and the second bonding roller (530). The second feeding roller (511) may guide the transport of the second electrode layer (EL2) from the second electrode reel (510) toward the second bonding roller (530).

[0138] The second membrane supply unit (520) can supply the second membrane (ML2) to the second bonding roller (530). The second membrane supply unit (520) may be in the form of a reel. When the reel rotates, the second membrane (ML2) is unwound, and the second membrane (ML2) can be supplied to the second bonding roller (530). However, it is not limited to a reel structure, and other supply structures are also possible.

[0139] The second membrane (ML2) may be a solid electrolyte or a separator.

[0140] In the case where the secondary battery according to the embodiments of the present invention is an all-solid-state battery, the first and second membranes (ML1, ML2) may be a solid electrolyte.

[0141] In the case where the secondary battery according to the embodiments of the present invention is a lithium-ion battery, the first and second membranes (ML1, ML2) may be separators.

[0142] In other words, the secondary battery manufacturing device (100) according to the embodiments of the present invention may be a manufacturing device for an all-solid-state battery or a manufacturing device for a lithium-ion battery depending on the types of the first and second membranes (ML1, ML2).

[0143] The second bonding roller (530) can bond or laminate the second electrode layer (EL2) and the second membrane (ML2). The second bonding roller (530) can press the second electrode layer (EL2) and the second membrane (ML2) to bond the second membrane (ML2) onto the second electrode layer (EL2). At this time, a heating process may be included to increase the bonding strength if necessary during the pressing process through the second bonding roller (530).

[0144] A second membrane (ML2) can be placed on top of the second electrode layer (EL2) based on the vertical direction (D3).

[0145] The second electrode layer (EL2) and the second membrane (ML2) can be bonded to form the second electrode body (EA2).

[0146] Referring to FIG. 4, a second guide roller (560) may be positioned between the second joining roller (530) and the joining portion (600). The second guide roller (560) may guide the transport of the second electrode body (EA2) from the second joining roller (530) toward the joining portion (600). Multiple second guide rollers (560) may be positioned. In embodiments of the present invention, three second guide rollers (560) may be positioned, but are not necessarily limited thereto.

[0147] The second guide roller (560) can guide the second electrode body (EA2) by inverting it vertically and in the direction of the joint (600). Referring to FIG. 4, it can be seen that three second guide rollers (560) are arranged. At this time, the second electrode body (EA2) is transported along the three second guide rollers (560), and the vertical orientation of the second electrode body (EA2) can be inverted.

[0148] The second adjustment unit (570) may be positioned between the second guide roller (560) and the joint (600). The second adjustment unit (570) can adjust the alignment state of the second electrode body (EA2).

[0149] In embodiments of the present invention, the second adjustment unit (570) may be an adjustment roller device capable of multi-directional adjustment. Although not illustrated in the drawings, the adjustment roller device may be connected to a driving means. The adjustment roller device may be a roller capable of adjusting the position in multiple directions while supporting the second electrode body (EA2). Accordingly, the second adjustment unit (570) may adjust the position along the horizontal direction (D2) and the vertical direction (D3), and may adjust the position by rotating on a plane (D1-D2).

[0150] The second adjustment unit (570) moves in the vertical direction (D3) and can adjust the tension of the second electrode body (EA2). The second adjustment unit (570) moves in the horizontal direction (D2) and can adjust the driving position according to the width direction of the second electrode body (EA2). The second adjustment unit (570) rotates on a plane (D1-D2) and can adjust the alignment angle according to the driving direction (D1) of the second electrode body (EA2).

[0151] Meanwhile, the driving speed of the second electrode body (EA2) can be adjusted through the unwinding rotation speed of the second electrode reel (510) and the unwinding rotation speed of the second membrane (ML2) supply unit (520).

[0152] Similar to the first adjustment unit (260), in embodiments of the present invention, the second adjustment unit (570) is not limited to the adjustment roller device described above and may include other position adjustment structures capable of adjusting the alignment state of the second electrode body (EA2).

[0153]

[0154] Referring to FIG. 4 and FIG. 10, the bonding portion (600) can bond or laminate the first electrode body (EA1), the counter electrode body (OE), and the second electrode body (EA2). In embodiments of the present invention, the bonding portion (600) may be a laminating roller device, but is not limited thereto, and may include other devices capable of bonding the first electrode body (EA1), the counter electrode body (OE), and the second electrode body (EA2).

[0155] The bonding portion (600) can bond the second electrode (EA2) onto the first electrode (EA1) and the counter electrode (OE) by applying pressure to the first electrode (EA1), the counter electrode (OE), and the second electrode (EA2). Although not illustrated in the drawing, a heating process may be included to increase bonding strength if necessary during the pressure application process using the bonding portion (600).

[0156] As described above, the second electrode body (EA2) can be moved to the upper side of the first electrode body (EA1) and the counter electrode body (OE) in an upside-down state by the second guide roller (560).

[0157] Accordingly, the second electrode body (EA2) may have the second membrane (ML2) located below the second electrode layer (EL2). Accordingly, the second membrane (ML2) may be laminated and bonded on top of the gasket (GK) and the counter electrode body (OE).

[0158] A first electrode body (EA1), a counter electrode body (OE), and a second electrode body (EA2) can be joined to form a bicell strap (PBC).

[0159] Here, the bicell strap (PBC) may refer to a state in which multiple bicells (BC) are connected to each other like a single band. The bicell strap (PBC) can be separated into multiple bicells (BC) and a waste strap (ST) after being notched at the notching section (700). This will be explained later.

[0160]

[0161] Referring to FIG. 4 and FIG. 12a to FIG. 12e, the notching portion (700) can notch the first and second electrode bodies (EA1, EA2).

[0162] The notching unit (700) may include a transfer unit (710), a notching sensing unit (740), and a punching unit (750).

[0163] The transfer unit (710) can supply a bicell strap (PBC) in the direction of the punching unit (750). The transfer unit (710) may include a body frame (711), a shaft frame (712), an upper feeder (720), a lower feeder (730), and a support (713).

[0164] The body frame (711) can form the lower part of the transfer unit (710) and can be placed on the process equipment.

[0165] The shaft frame (712) may be positioned on the upper part of the body frame (711). The shaft frame (712) may be in the form of a pair of plates spaced apart from each other and protruding upward. An upper feeder (720), a lower feeder (730), and a support (713) may be positioned on the shaft frame (712).

[0166] The upper feeder (720) supports the upper part of the buy-cell strap (PBC) and can supply the buy-cell strap (PBC) to the punching unit (750). The lower feeder (730) supports the lower part of the buy-cell strap (PBC) and can supply the buy-cell strap (PBC) to the punching unit (750).

[0167] Referring to FIG. 12d, the upper feeder (720) may include an upper motor (721), a first upper shaft (724), a second upper shaft (725), an upper drive belt (726), an upper feeder belt (727), and an upper guard (728).

[0168] The first upper shaft (724) can be rotatably positioned to penetrate the shaft frame (712) along the second direction (D2).

[0169] The end of the first upper shaft (724) can be connected to the rotation axis of the upper motor (721).

[0170] The second upper shaft (725) may be positioned on the shaft frame (712) at a predetermined distance from the first upper shaft (724). The second upper shaft (725) may be positioned to be rotatable and penetrate the shaft frame (712) along the second direction (D2).

[0171] The first upper shaft (724) and the second upper shaft (725) can be connected by an upper drive belt (726) in the form of an endless track. Although not shown in the drawing, gear teeth may be formed on the inner surface of the upper drive belt (726), and gear teeth may be formed on the outer surface of the first and second upper shafts (724, 725) at the portion connected to the upper drive belt (726). Thus, the gear teeth can mesh with each other to transmit rotational force.

[0172] The upper feeder belt (727) may be positioned on the inner side of the shaft frame (712). The upper feeder belt (727) may be in the form of an endless track, and the upper feeder belt (727) may be connected to the first upper shaft (724) and the second upper shaft (725). Although not shown in the drawing, gear teeth may be formed on the inner surface of the upper feeder belt (727), and gear teeth may be formed on the outer surface of the first and second upper shafts (724, 725) at the portion connected to the upper feeder belt (727). Thus, the gear teeth may mesh with each other to transmit rotational force.

[0173] When the upper motor (721) rotates, the first upper shaft (724) rotates, and since the second upper shaft (725) is connected to the first upper shaft (724) through the upper drive belt (726), the second upper shaft (725) can also rotate together.

[0174] As the first and second upper shafts (724, 725) rotate together, the upper feeder belt (727) can rotate. The upper feeder belt (727) can come into contact with the upper part of the bicell strap (PBC) and transport the bicell strap (PBC) toward the punching unit (750).

[0175] The upper guard (728) may be placed on both sides of the upper feeder belt (727). The upper guard (728) supports the sides of the upper feeder belt (727) to prevent the upper feeder belt (727) from deviating in the second direction (D2).

[0176] The lower feeder (730) may include a lower motor (731), a first lower shaft (734), a second lower shaft (735), a lower drive belt (736), a lower feeder belt (737), and a lower guard (738).

[0177] The first lower shaft (734) can be positioned on the shaft frame (712) at the lower part of the first upper shaft (724).

[0178] The end of the first lower shaft (734) can be coupled to the rotation axis of the lower motor (731). The lower motor (731) can be positioned on the shaft frame (712) below the upper motor (721).

[0179] The second lower shaft (735) may be spaced apart from the first lower shaft (734) on the shaft frame (712) at a predetermined distance.

[0180] The first and second lower shafts (734, 735) can be rotatably positioned to penetrate the shaft frame (712) along the second direction (D2).

[0181] The first lower shaft (734) and the second lower shaft (735) can be connected by an endless track-type lower drive belt (736). Although not shown in the drawing, gear teeth may be formed on the inner surface of the lower drive belt (736), and gear teeth may be formed on the outer surface of the first and second lower shafts (734, 735) at the portion connected to the lower drive belt (736). Thus, the gear teeth can mesh with each other to transmit rotational force.

[0182] The lower feeder belt (737) may be positioned on the inner side of the shaft frame (712). Additionally, the lower feeder belt (737) may be positioned below the upper feeder belt (727). The bicell strap (PBC) may pass between the upper feeder belt (727) and the lower feeder belt (737).

[0183] The lower feeder belt (737) may be in the form of an endless track, and the lower feeder belt (737) may be connected to the first lower shaft (734) and the second lower shaft (735). Although not shown in the drawing, gear teeth may be formed on the inner surface of the lower feeder belt (737), and gear teeth may be formed on the outer surface of the first and second lower shafts (734, 735) at the portion connected to the lower feeder belt (737). Thus, the gear teeth may mesh with each other to transmit rotational force.

[0184] When the lower motor (731) rotates, the first lower shaft (734) rotates, and since the second lower shaft (735) is connected to the first lower shaft (734) through the lower drive belt (736), the second lower shaft (735) can also rotate together.

[0185] As the first and second lower shafts (734, 735) rotate together, the lower feeder belt (737) can rotate. The lower feeder belt (737) can contact the lower part of the bicell strap (PBC) to transport the bicell strap (PBC) toward the punching unit (750).

[0186] The lower guard (738) may be placed on both sides of the lower feeder belt (737). The lower guard (738) supports the sides of the lower feeder belt (737) to prevent the lower feeder belt (737) from moving out in the second direction (D2).

[0187] The support member (713) can be positioned between the upper feeder belt (727) and the lower feeder belt (737) on the inside of the shaft frame (712).

[0188] The support member (713) can support the lower part of the bicell strap (PBC). In other words, the bicell strap (PBC) is supported by the support member (713) and can pass between the upper feeder belt (727) and the lower feeder belt (737).

[0189] The upper feeder belt (727) and the lower feeder belt (737) can each rotate and transport the bicell strap (PBC) to the punching unit (750).

[0190]

[0191] Referring to FIG. 12e, the notching sensing unit (740) can measure the alignment state of the bicell strap (PBC).

[0192] The notching sensing unit (740) may include a first notching measurement sensor (741) and a second notching measurement sensor (743). The first notching measurement sensor (741) may be positioned on one side of the shaft frame (712) along the second direction (D2). The second notching measurement sensor (743) may be positioned on the other side of the shaft frame (712) along the second direction (D2). The first and second notching measurement sensors (741, 743) can measure whether the bicell strap (PBC) is aligned in the correct position in the width direction (D2).

[0193] In addition, the first notching measurement sensor (741) and the second notching measurement sensor (743) can measure the position and contour of the counter electrode (OE) that is hidden from view by the second electrode body (EA2), the position and contour of the gasket (GK), and the position and contour of the part to be separated into the bicell (BC).

[0194] The first notching measurement sensor (741) and the second notching measurement sensor (743) may be vision devices, but are not necessarily limited thereto.

[0195] The punching unit (750) can manufacture a bicell (BC) by precisely punching the counter electrode (OE) and the first and second electrodes (EA1, EA2) from the bicell strap (PBC). Thus, it is possible to measure whether the bicell strap (PBC) is aligned in the correct position before the bicell strap (PBC) enters the punching unit (750).

[0196]

[0197] Referring to FIGS. 12b and 12c, the punching unit (750) can produce a bicell (BC) by punching the bicell strap (PBC) supplied from the transfer unit (710).

[0198] The punching unit (750) may include a fixed mold part (760) and a movable mold part (770).

[0199] The fixed mold part (760) may include a lower block (762), a die (761), a post (763), and an outlet (764).

[0200] The lower block (762) can form the lower part of the punching unit (750) and can be placed on the process equipment.

[0201] The die (761) can be formed inside the lower block (762). A punch hole (772) that penetrates the die (761) in the vertical direction (D3) can be formed on the die (761).

[0202] The post (763) may be a cylindrical beam and may be arranged in the vertical direction (D3). Multiple posts (763) may be arranged along the edge of the lower block (762).

[0203] The discharge port (764) may be formed by penetrating the lower block (762) along the vertical direction (D3). The discharge port (764) may be connected to the punch (772) hole of the die (761), but this is merely one example of various discharge structures and is not necessarily limited thereto.

[0204]

[0205] The moving mold part (770) may include an upper block (771), a punch (772), a holder (773), and an elastic body (774).

[0206] The upper block (771) may form the upper part of the punching unit (750) and may be placed on the upper part of the lower block (762). Although not shown in the drawing, the upper block (771) may be connected to a lifting means. The lifting means may raise the upper block (771) in the vertical direction (D3). For example, the lifting means may be a hydraulic device, but is not necessarily limited thereto.

[0207] A punch (772) may be positioned at the bottom of an upper block (771). The punch (772) may be configured with a shape corresponding to the shape of the bicell (BC) to be punched. For example, the punch (772) may include a punch body (772a) and a punch wing (772b). The punch body (772a) can punch the first and second electrode bodies (EA1, EA2) and the counter electrode body (OE) together on the bicell strap (PBC). The punch wing (772b) can punch the first and second electrode tabs (EL13, EL23) together with the counter electrode tab (OE3).

[0208] The holder (773) can be connected to the lower part of the upper block (771) by an elastic body (774). When the upper block (771) descends along the post (763), the holder (773) can press the bicell strap (PBC). The elastic body (774) can generate appropriate pressure for the holder (773) to fix the position of the bicell strap (PBC).

[0209] The holder (773) can fix the position of the buyel strap (PBC) while the punch (772) punches the buyel strap (PBC). Accordingly, the punch (772) can stably punch the buyel strap (PBC) to produce the buyel (BC).

[0210] When the lifting means (not shown) lowers the upper block (771), the upper block (771) can move downward (D3) along the post (763).

[0211] At this time, the holder (773) can press and secure the bicell strap (PBC). The elastic body (774) can prevent the holder (773) from pressing the bicell strap (PBC) with excessive force.

[0212] The punch (772) can punch the bicell strap (PBC). Since the holder (773) is pressing the bicell strap (PBC), the punch (772) can stably punch the bicell strap (PBC) to produce the bicell (BC).

[0213] The bicell (BC) can be transferred downward (D3) through the discharge port (764) from the punch (772) hole of the die (761).

[0214]

[0215] The magazine section (810) can be placed below the notching section (700). The bicells (BC) discharged from the notching section (700) can be stacked in the magazine section (810).

[0216] And the waste strap (ST) can be discharged and removed outside the notching section (700). Here, the waste strap (ST) can be defined as the remaining part of the bicell strap (PBC) from which the bicell (BC) has been removed.

[0217]

[0218] Referring to FIG. 15, the alignment control unit (900) can align the driving positions of the first and second electrode bodies (EA1, EA2).

[0219] The alignment control unit (900) may include a pattern forming unit (910), a position measuring unit (930), a calculation unit (940), and a position adjustment unit (950).

[0220] The pattern forming unit (910) can form a first pattern part (PH1) and a second pattern part (PH2) along the driving direction (D1) on the first electrode body (EA1) and the second electrode body (EA2), respectively.

[0221] The pattern forming unit (910) may include a first pattern forming unit (912) and a second pattern forming unit (914).

[0222] Referring to FIG. 6, the first pattern forming unit (912) may be positioned between the first electrode supply unit (200) and the gasket forming unit (300). The first pattern forming unit (912) may form a first pattern portion (PH1) on the unpatterned portion (EA11) of the first electrode body (EA1). In an embodiment of the present invention, the first pattern portion (PH1) may have a through-hole shape. In other words, the first pattern portion (PH1) may be formed by penetrating the unpatterned portion (EA11) of the first electrode body (EA1) along the vertical direction (D3). The first pattern forming unit (912) may be a laser cutting device, a punching device, etc. If the first pattern forming unit (912) is a laser cutting device, it may form the first pattern portion (PH1) by firing a laser to cut and penetrate the unpatterned portion (EA11) of the first electrode body (EA1). If the first pattern forming unit (912) is a punching device, the first pattern portion (PH1) can be formed by punching and penetrating the unpatterned portion (EA11) of the first electrode body (EA1). The first pattern forming unit (912) may also include other devices capable of penetrating the first electrode body (EA1).

[0223]

[0224] Referring to FIG. 9, the second pattern forming unit (914) may be positioned between the second electrode supply unit (500) and the bonding unit (600). The second pattern forming unit (914) may form a second pattern portion (PH2) on the unpatterned portion (EA21) of the second electrode body (EA2). In an embodiment of the present invention, the second pattern portion (PH2) may have a through-hole shape similar to the first pattern portion (PH1). In other words, the second pattern portion (PH2) may be formed by penetrating the unpatterned portion (EA21) of the second electrode body (EA2) along the vertical direction (D3). The second pattern forming unit (914) may be a laser cutting device, a punching device, etc. If the second pattern forming unit (914) is a laser cutting device, it may form the second pattern portion (PH2) by firing a laser to cut and penetrate the unpatterned portion (EA21) of the second electrode body (EA2). If the second pattern forming unit (914) is a punching device, the second pattern part (PH2) can be formed by punching and penetrating the unpunched portion (EA21) of the second electrode body (EA2). The second pattern forming unit (914) may also include other devices capable of penetrating the second electrode body (EA2).

[0225]

[0226] Referring to FIG. 11, the first and second pattern portions (PH1, PH2) may have a polygonal shape and a through hole shape. The first and second pattern portions (PH1, PH2) may be formed with the same shape based on the vertical direction (D3).

[0227] In an embodiment of the present invention, the first and second pattern portions (PH1, PH2) may be square-shaped through holes. However, they are not necessarily limited thereto, and through holes of other polygonal shapes, such as pentagons or hexagons, are also possible. In this case, the first pattern portion (PH1) and the second pattern portion (PH2) may have shapes that coincide with respect to the vertical direction (D3).

[0228] Each of the first and second pattern sections (PH1, PH2) may include a plurality of through surfaces.

[0229] A plurality of through surfaces formed in the first pattern section (PH1) may include one or more first straight sections (SH1) or one or more first section lines (SH3). In this case, the first straight section (SH1) may be formed facing the driving direction (D1). The first section line (SH3) may be formed facing the width direction (D2).

[0230] As disclosed in FIG. 11, when the first pattern portion (PH1) is a square-shaped through hole, the first straight portion (SH1) and the first section line portion (SH3) may be adjacent to each other with a corner. When the first pattern portion (PH1) is a different polygonal shape, the first straight portion (SH1) and the first section line portion (SH3) may not be adjacent to each other with a corner. In this case as well, the first straight portion (SH1) may be formed facing the driving direction (D1), and the first section line portion (SH3) may be formed facing the width direction (D2).

[0231] A plurality of through surfaces formed in the second pattern section (PH2) may include one or more second straight sections (SH2) or one or more second section lines (SH4). The second straight section (SH2) may be formed facing the driving direction (D1). The first section line (SH3) may be formed facing the width direction (D2).

[0232] As disclosed in FIG. 11, when the second pattern section (PH2) is a square-shaped through hole, the second straight section (SH2) and the second section line section (SH4) may be adjacent to each other with a corner. When the second pattern section (PH2) is a different polygonal shape, the second straight section (SH2) and the second section line section (SH4) may not be adjacent to each other with a corner. In this case as well, the second straight section (SH2) may be formed facing the driving direction (D1), and the second section line section (SH4) may be formed facing the width direction (D2).

[0233]

[0234] The position measuring unit (930) can measure the alignment state between the first and second pattern units (PH1, PH2) and the alignment state between the first and second electrode bodies (EA1, EA2).

[0235] The position measuring unit (930) may include a first pattern measuring sensor (931), a gasket measuring sensor (932), an insert sensing unit (933), a second pattern measuring sensor (934), and a bonding sensing unit (935).

[0236] Referring to FIG. 6, the first pattern measurement sensor (931) may be positioned at the rear end of the first pattern forming unit (912) based on the driving direction (D1) of the first electrode body (EA1). The first pattern measurement sensor (931) can measure whether the first pattern forming unit (912) forms a plurality of first pattern parts (PH1) at precise intervals on the unmarked portion (EA11) of the first electrode body (EA1), and whether the first pattern part (PH1) is formed as a polygonal shape through hole as designed.

[0237] The first pattern measurement sensor (931) may be various vision devices such as a camera, but is not necessarily limited thereto.

[0238] In an embodiment of the present invention, the first pattern measuring sensor (931) can measure whether the first pattern portion (PH1) is formed as a square-shaped through hole, whether a plurality of first pattern portions (PH1) are formed at a constant interval (P) on the unmarked portion (EA11) of the first electrode body (EA1).

[0239]

[0240] Referring to FIG. 7a, the gasket measuring sensor (932) can be positioned at the rear end of the gasket forming roller (310) based on the driving direction (D1) of the first electrode body (EA1). The gasket measuring sensor (932) can check whether the gasket (GK) is positioned at the designed location on the first electrode body (EA1), whether the gasket (GK) has the designed shape, etc.

[0241] The gasket measuring sensor (932) may be various vision devices such as a camera, but is not necessarily limited thereto.

[0242]

[0243] Referring to FIG. 8a, the insert sensing unit (933) may be positioned between the counter electrode supply unit (400) and the joint unit (600). The insert sensing unit (933) can measure whether the counter electrode body (OE) is stacked at a position designed on the inside of the gasket (GK). Specifically, the insert sensing unit (933) can measure the gap error value (DV) between the two corners of the gasket (GK) and the two corners of the counter electrode body (OE) based on the width direction (D2).

[0244] The insert sensing unit (933) may include a first insert measurement sensor (933a) and a second insert measurement sensor (933b).

[0245] The first insert measurement sensor (933a) may be positioned adjacent to the non-existent portion (EA11) of the first electrode body (EA1). The second insert measurement sensor (933b) may be positioned on the opposite side of the first insert measurement sensor (933a) with respect to the width direction (D2) of the first electrode body (EA1).

[0246] The first and second insert measurement sensors (933a, 933b) may be various vision devices such as cameras, but are not necessarily limited thereto.

[0247] Referring to FIG. 8b, the first insert measuring sensor (933a) can measure the first gap error value (DV1) and the third gap error value (DV3) between the gasket (GK) and the counter electrode (OE). The second insert measuring sensor (933b) can measure the second gap error value (DV2) and the fourth gap error value (DV4) between the gasket (GK) and the counter electrode (OE).

[0248] The first insert measurement sensor (933a) and the second insert measurement sensor (933b) can measure whether the first gap error value (DV1), the second gap error value (DV2), the third gap error value (DV3), and the fourth gap error value (DV4) are within a preset error tolerance range. Additionally, they can measure whether the first gap error value (DV1) and the second gap error value (DV2) are the same, and whether the third gap error value (DV3) and the fourth gap error value (DV4) are the same.

[0249] If the first gap error value (DV1) to the fourth gap error value (DV4) exceeds the preset error tolerance range, it can be determined that the counter electrode (OE) is not laminated at the designed position on the inside of the gasket (GK).

[0250] If the first gap error value (DV1) and the second gap error value (DV2) are not the same value within the allowable range, or if the third gap error value (DV3) and the fourth gap error value (DV4) are not the same value within the allowable range, it can be determined that the counter electrode (OE) is not stacked in the correct position on the inside of the gasket (GK).

[0251]

[0252] Referring to FIG. 9, the second pattern measurement sensor (934) may be positioned at the rear end of the second pattern forming unit (914) based on the driving direction (D1) of the second electrode body (EA2). The second pattern measurement sensor (934) can measure whether the second pattern forming unit (914) forms a plurality of second pattern parts (PH2) at precise intervals on the unmarked portion (EA21) of the second electrode body (EA2), and whether the second pattern part (PH2) is formed as a polygonal shape through hole as designed.

[0253] The second pattern measurement sensor (934) may be various vision devices such as a camera, but is not necessarily limited thereto.

[0254] In an embodiment of the present invention, the second pattern measuring sensor (934) can measure whether the second pattern part (PH2) is formed as a square-shaped through hole, whether a plurality of second pattern parts (PH2) are formed at a constant interval (P) on the unmarked part (EA11) of the first electrode body (EA1).

[0255]

[0256] Referring to FIG. 10, the bonding sensing unit (935) can be positioned between the bonding unit (600) and the notching unit (700). The bonding sensing unit (935) can measure the alignment state between the first and second straight sections (SH1, SH2) to measure the alignment state between the first and second electrode bodies (EA1, EA2). Additionally, it can measure the alignment state between the first and second section lines (SH3, SH4) to measure the alignment state between the first and second electrode bodies (EA1, EA2).

[0257] Referring to FIG. 11, the joint sensing unit (935) can measure one or more of the following: a first alignment position error value (DT) based on the driving direction (D1) between the first and second section lines (SH3, SH4), a second alignment position error value (DT21, DT22) based on the width direction (D2) between the first and second straight sections, or an alignment angle error value (θ) based on the driving direction (D1) between the first and second straight sections (SH1, SH2).

[0258]

[0259] The calculation unit (940) can calculate the driving position adjustment value of the first and second electrode bodies (EA1, EA2).

[0260] Specifically, the calculation unit (940) can calculate the driving position adjustment value of the first electrode body (EA1) through the first to fourth gap error values ​​(DV1, DV2, DV3, DV4) between the two corners of the gasket (GK) and the two corners of the counter electrode body (OE).

[0261] And, the driving position adjustment value of the first electrode body (EA1) or the second electrode body (EA2) can be calculated through the relative position between the first and second pattern parts (PH1, PH2).

[0262] The driving position adjustment value of the first electrode body (EA1) may include one or more of the supply speed adjustment value of the first electrode reel (210), the supply speed adjustment value of the first membrane supply unit (220), the position adjustment value in the width direction (D2) of the first adjustment unit (260), and the rotation adjustment value on the plane (D1-D2).

[0263] The driving position adjustment value of the second electrode body (EA2) may include one or more of the supply speed adjustment value of the second electrode reel (510), the supply speed adjustment value of the second membrane supply unit (520), the position adjustment value in the width direction (D2) of the second adjustment unit (570), and the rotation adjustment value on the plane (D1-D2).

[0264]

[0265] The position adjustment unit (950) can adjust the driving position of the first and second electrode bodies (EA1, EA2).

[0266] Specifically, the position adjustment unit (950) can adjust one or more of the driving angles of the first and second electrode bodies (EA1, EA2) based on the driving speed and driving direction (D1) of the first and second electrode bodies (EA1, EA2).

[0267] The position adjustment unit (950) can adjust the driving speed of the first electrode body (EA1) by adjusting the supply speed of the first electrode reel (210) and the supply speed of the first membrane supply unit (220).

[0268] The position adjustment unit (950) can move the first electrode body (EA1) in the width direction (D2) by operating the first adjustment unit (260) or adjust the driving angle of the first electrode body (EA1) by rotating the first adjustment unit (260) on the plane (D1-D2).

[0269] In addition, the position adjustment unit (950) can adjust the tension of the first electrode body (EA1) by adjusting the vertical position (D3) of the first adjustment unit (260).

[0270] The position adjustment unit (950) can adjust the driving speed of the second electrode body (EA2) by adjusting the supply speed of the second electrode reel (510) and the supply speed of the second membrane supply unit (520).

[0271] The position adjustment unit (950) can move the second electrode body (EA2) in the width direction (D2) by operating the second adjustment unit (570) or adjust the driving angle of the second electrode body (EA2) by rotating the second adjustment unit (570) on the plane (D1-D2).

[0272] In addition, the position adjustment unit (950) can adjust the tension of the second electrode body (EA2) by adjusting the vertical position (D3) of the second adjustment unit (570).

[0273] The secondary battery manufacturing device (100) according to embodiments of the present invention can precisely measure and adjust the alignment state between the first and second electrode bodies (EA1, EA2) and the stacking position of the counter electrode body (OE) through the configurations of the alignment control unit (900) described above.

[0274]

[0275] The secondary battery manufacturing apparatus (100) according to the embodiments of the present invention is as described above, and below, a method for manufacturing a secondary battery will be explained with reference to FIGS. 13 to 14d.

[0276] Referring to FIG. 13, a method for manufacturing a secondary battery according to embodiments of the present invention comprises: forming a first electrode body (EA1) and forming a first pattern portion (PH1) along a driving direction (D1) on the first electrode body (EA1) (S10); stacking a gasket (GK) and a counter electrode body (OE) on the first electrode body (EA1) (S20); measuring the alignment state between the gasket (GK) and the counter electrode body (OE) and aligning the driving position of the first electrode body (EA1) (S30); forming a second electrode body (EA2) and forming a second pattern portion (PH2) along a driving direction (D1) on the second electrode body (EA2) (S40); joining the first electrode body (EA1), the counter electrode body (OE), and the second electrode body (EA2) (S50); and measuring the alignment state between the first and second pattern portions (PH1, PH2). It may include aligning the driving positions of the first and second electrode bodies (EA1, EA2) (S60), notching the first and second electrode bodies (EA1, EA2) (S70), and manufacturing a bicell (BC) (S80).

[0277]

[0278] Referring to FIG. 6 and FIG. 14a, forming the first electrode body (EA1) and forming the first pattern part (PH1) along the driving direction (D1) on the first electrode body (EA1) (S10) can be performed by unwinding the first electrode reel (210) to drive the first electrode layer (EL1) (S11). The first membrane supply part (220) can be operated to drive the first membrane (ML1) (S12).

[0279] The first electrode layer (EL1) and the first membrane (ML1) can pass through the first bonding roller (230) and be bonded to each other to form the first electrode body (EA1) (S13).

[0280] The first pattern forming unit (912) can form a first pattern portion (PH1) on the unpatterned portion (EA11) of the first electrode body (EA1) (S14). A plurality of first pattern portions (PH1) can be formed on the unpatterned portion (EA11) of the first electrode body (EA1) at regular intervals (P; see FIG. 6).

[0281] As described above, the first pattern portion (PH1) according to an embodiment of the present invention may be in the form of a square through hole. Referring to FIG. 11, it may include a first straight portion (SH1) formed along the driving direction (D1) of the first electrode body (EA1) and a first section line portion (SH3) formed along the width direction (D2) of the first electrode body (EA1).

[0282] The first pattern measurement sensor (931) can measure whether the first pattern part (PH1) is formed in a designed shape, a designed location, etc., and transmit the measurement data to the location measurement part (930).

[0283]

[0284] Referring to FIGS. 7a, FIGS. 8a, FIGS. 8b and FIGS. 14a, stacking a gasket (GK) and a counter electrode (OE) on the first electrode body (EA1) (S20) can stack a gasket (GK) on the first electrode body (EA1) (S21). The tank (320) can supply gasket raw material to the gasket forming groove (311) of the gasket forming roller (310). The gasket forming roller (310) can rotate and stack a gasket (GK) on the first electrode body (EA1). The support roller (330) can support the lower part of the first electrode body (EA1) while the gasket forming roller (310) stacks a gasket (GK) on the first electrode body (EA1).

[0285] The gasket measurement sensor (932) can measure whether the gasket (GK) is stacked at a designed position on the first electrode body (EA1). The gasket measurement sensor (932) can transmit measurement data related to the placement position of the gasket (GK) to the position measurement unit (930).

[0286] The counter electrode supply unit (400) operates and the counter electrode body (OE) passes through the insert guide (410) and can be laminated on the inner side of the gasket (GK) on the first electrode body (EA1) (S22).

[0287]

[0288] Referring to FIG. 8b and FIG. 14b, measuring the alignment state between the gasket (GK) and the counter electrode (OE) and aligning the driving position of the first electrode (EA1) (S30) can be done by measuring the gap error value (DV) between the two corners of the gasket (GK) and the two corners of the counter electrode (OE) to measure the alignment state between the gasket (GK) and the counter electrode (OE) (S31).

[0289] As described above, the first and second insert measuring sensors (933a, 933b) can be positioned at the rear end of the insert guide (410).

[0290] Based on the width direction (D2) of the first electrode body (EA1), the first insert measuring sensor (933a) can measure the first gap error value (DV1) and the third gap error value (DV3) between one corner of the gasket (GK) and one corner of the counter electrode body (OE).

[0291] The second insert measuring sensor (933b) can measure the second gap error value (DV2) and the fourth gap error value (DV4) between the opposite corner of the gasket (GK) and the opposite corner of the counter electrode (OE).

[0292] Next, it can be determined whether the first and second gap error values ​​(DV1, DV2) are within a pre-designed error tolerance range (S32).

[0293] For example, when the gap error value (DV) is designed to be within 0.5 mm, if one or more of the first gap error value (DV1) or the second gap error value (DV2) exceeds 0.5 mm, it can be determined that the counter electrode (OE) is not laminated at the designed position on the inside of the gasket (GK).

[0294] Conversely, when the gap error value (DV) is designed to be within 0.5 mm, if both the first gap error value (DV1) and the second gap error value (DV2) do not exceed 0.5 mm, it can be determined that the counter electrode (OE) is laminated at a designed position inside the gasket (GK).

[0295] Additionally, the first and second insert measurement sensors (933a, 933b) can measure whether the first gap error value (DV1) and the second gap error value (DV2) are the same value.

[0296] For example, if the first gap error value (DV1) is measured as 2 mm and the second gap error value (DV2) is measured as 4 mm, the first gap error value (DV1) and the second gap error value (DV2) are different from each other but are values ​​within the designed error tolerance range. Therefore, it can be determined that the counter electrode (OE) is laminated in the designed position on the inside of the gasket (GK).

[0297] If the first gap error value (DV1) is measured as 3 mm and the second gap error value (DV2) is measured as 6 mm, the first gap error value (DV1) and the second gap error value (DV2) are different from each other. Also, since the second gap error value (DV2) exceeds the designed error tolerance range, it can be determined that the counter electrode (OE) is not laminated in the designed position on the inside of the gasket (GK).

[0298] Likewise, the first and second insert measurement sensors (933a, 933b) can also measure whether the third and fourth interval error values ​​(DV3, DV4) are the same in the same way as the first and second interval error values ​​(DV1, DV2) described above.

[0299] Referring to FIG. 14b, the above description may correspond to determining whether the gap error value (DV) between the two corners of the gasket (GK) and the two corners of the counter electrode (OE) is within the allowable error range.

[0300] If the first to fourth gap error values ​​(DV1~DV4) are within the error tolerance range (e.g.), joining the first electrode body (EA1), the counter electrode body (OE), and the second electrode body (EA2) (S50) can be performed.

[0301] Conversely, if the first to fourth gap error values ​​(DV1~DV2) are not within the error tolerance range (No), the gap error adjustment value between the gasket (GK) and the counter electrode (OE) can be calculated (S33).

[0302] The calculation unit (940) can calculate the driving position adjustment value of the first electrode body (EA1) through the above gap error value (DV).

[0303] The driving position adjustment value of the first electrode body (EA1) may include one or more of the rotational speed adjustment value of the first electrode reel (210), the supply speed adjustment value of the first membrane supply unit (220), the position adjustment value in the width direction (D2) of the first adjustment unit (260), and the rotation adjustment value on the plane (D1-D2).

[0304] In other words, the calculation unit (940) can calculate one or more of the rotation speed adjustment value of the first electrode reel (210), the supply speed adjustment value of the first membrane supply unit (220), the position adjustment value in the width direction (D2) of the first adjustment unit (260), and the rotation adjustment value on the plane (D1-D2).

[0305] The position adjustment unit (950) can adjust one or more of the driving speed and driving angle based on the driving direction (D1) of the first electrode body (EA1) through the driving position adjustment value of the first electrode body (EA1) calculated by the calculation unit (940).

[0306] Specifically, the position adjustment unit (950) can adjust the driving speed of the first electrode body (EA1) by adjusting the rotation speed of the first electrode reel (210) and the supply speed of the first membrane supply unit (220).

[0307] The position adjustment unit (950) can move the first electrode body (EA1) in the width direction (D2) by operating the first adjustment unit (260) or adjust the driving angle of the first electrode body (EA1) by rotating the first adjustment unit (260) on the plane (D1-D2).

[0308]

[0309] Referring to FIG. 9 and FIG. 14c, forming the second electrode body (EA2) and forming the second pattern part (PH2) along the driving direction (D1) on the second electrode body (EA2) (S40) allows the second electrode reel (510) to be unwound to drive the second electrode layer (EL2) (S41). The second membrane supply part (520) can be operated to drive the second membrane (ML2) (S42).

[0310] The second electrode layer (EL2) and the second membrane (ML2) can pass through the second bonding roller (530) and be bonded to each other to form the second electrode body (EA2) (S43).

[0311] The second pattern forming unit (914) can form a second pattern portion (PH2) on the unpatterned portion (EA21) of the second electrode body (EA2) (S44). Multiple second pattern portions (PH2) can be formed along a constant interval on the unpatterned portion (EA21) of the second electrode body (EA2). Here, the constant interval may be the same as the constant interval (P) disclosed in FIG. 6.

[0312] As described above, the second pattern portion (PH2) according to an embodiment of the present invention may be in the form of a square through-hole. Accordingly, it may include a second straight portion (SH2) formed along the driving direction (D1) of the second electrode body (EA2) and a second section line portion (SH4) formed along the width direction (D2) of the second electrode body (EA2).

[0313] The second pattern measurement sensor (934) can measure whether the second pattern part (PH2) is formed in a designed shape, a designed location, etc., and transmit the measurement data to the location measurement part (930).

[0314]

[0315] Referring to FIG. 10 and FIG. 14d, joining the first electrode body (EA1), the counter electrode body (OE), and the second electrode body (EA2) (S50) can be done by pressing the first electrode body (EA1), the counter electrode body (OE), and the second electrode body (EA2) that have a joining portion (600).

[0316] Specifically, the bonding portion (600) can bond the second electrode (EA2) onto the first electrode (EA1) and the counter electrode (OE) by applying pressure to the first electrode (EA1), the counter electrode (OE), and the second electrode (EA2). At this time, a heating process may be included to increase the bonding strength if necessary during the pressure application process using the bonding portion (600).

[0317] As described above, the second electrode body (EA2) can be moved to the upper side of the first electrode body (EA1) and the counter electrode body (OE) in an upside-down state by the second guide roller (560).

[0318] In other words, the second electrode body (EA2) may have the second membrane (ML2) located below the second electrode layer (EL2). Thus, the second membrane (ML2) can be laminated and bonded on top of the gasket (GK) and the counter electrode body (OE).

[0319] A first electrode body (EA1), a counter electrode body (OE), and a second electrode body (EA2) can be joined to form a bicell strap (PBC).

[0320]

[0321] Aligning the driving positions of the first and second electrode bodies (EA1, EA2) by measuring the alignment state between the first and second pattern sections (PH1, PH2) (S60) can be achieved by the bonding sensing section (935) measuring the alignment state between the first and second straight sections (SH1, SH2) and the alignment state between the first and second section sections (SH3, SH4) to measure the alignment state between the first and second electrode bodies (EA1, EA2) (S61).

[0322] Referring to FIG. 11, the joint sensing unit (935) can measure one or more of the following: a first alignment position error value (DT) based on the driving direction (D1) between the first and second section lines (SH3, SH4), a second alignment position error value (DT21, DT22) based on the width direction (D2) between the first and second straight sections, or an alignment angle error value (θ) based on the driving direction (D1) between the first and second straight sections (SH1, SH2).

[0323] Specifically, the bonding sensing unit (935) can sense the first section line (SH3) and the second section line (SH4). In FIG. 11, it is shown that there is a first alignment position error value (DT) based on the driving direction (D1) between the first section line (SH3) and the second section line (SH4). Therefore, the bonding sensing unit (935) can numerically measure the first alignment position error value (DT).

[0324] Through the above first alignment position error value (DT), it is possible to determine how much the alignment position needs to be changed along the driving direction (D1) between the first and second electrode bodies (EA1, EA2).

[0325] Additionally, the bonding sensing unit (935) can sense the first straight section (SH1) and the second straight section (SH2) to measure the second alignment position error value (DT21, DT22) based on the width direction (D2) between the first and second electrode bodies (EA1, EA2).

[0326] The bonding sensing unit (935) can determine how much the alignment position of the second electrode body (EA2) needs to be changed in the width direction (D2) based on the first electrode body (EA1) through the second alignment position error values ​​(DT21, DT22).

[0327] Additionally, the bonding sensing unit (935) can sense the first straight section (SH1) and the second straight section (SH2) to measure the alignment angle error value (θ) based on the driving direction (D1). In FIG. 11, it is shown that there is an alignment angle error value (θ) based on the driving direction (D1) between the first straight section (SH1) and the second straight section (SH2). Therefore, the bonding sensing unit (935) can numerically measure the alignment angle error value (θ).

[0328] For example, the alignment angle error value (θ) between the first straight section (SH1) and the second straight section (SH2) may be 0 degrees. When the measured alignment angle error value (θ) is 0 degrees, it can be determined that the first electrode body (EA1) and the second electrode body (EA2) are traveling in a state where the driving direction (D1) is aligned.

[0329] If the measured alignment angle error value (θ) is not 0 degrees, but another angle, for example 2 degrees, it can be determined that there is an error in the alignment angle between the first straight section (SH1) and the second straight section (SH2).

[0330] The alignment angle error value (θ) can be calculated through the second alignment position error value (DT21, DT22) based on the width direction (D2) between the first and second electrode bodies (EA1, EA2) described above.

[0331] The calculation unit (940) and position adjustment unit (950) described later can precisely adjust the alignment position between the first and second electrode bodies (EA1, EA2) through the alignment angle error value (θ), the first alignment position error value (DT) based on the driving direction (D1), and the second alignment position error value (TD21, TD22) based on the width direction (D2).

[0332] The bonding sensing unit (935) can transmit the measured data of the first alignment position error value (DT), the second alignment position error value (DT21, DT22), and the alignment angle error value (θ) to the alignment control unit (900).

[0333] The alignment control unit (900) can determine whether there is an alignment error between the first and second pattern units (PH1, PH2) (S62).

[0334] If it is determined that there is an alignment error between the first and second pattern parts (PH1, PH2) (e.g.), an alignment error adjustment value between the first and second pattern parts (PH1, PH2) can be calculated (S63).

[0335] The calculation unit (940) can calculate the alignment position adjustment values ​​of the first electrode body (EA1) and the second electrode body (EA2) through the measured first alignment position error value (DT), second alignment position error value (DT21, DT22), and alignment angle error value (θ).

[0336] For example, as illustrated above, when the alignment angle error value (θ) is 2 degrees, the calculation unit (940) can calculate an alignment angle adjustment value to match the alignment angle between the first straight section (SH1) and the second straight section (SH2).

[0337] After calculating the alignment position adjustment values ​​of the first electrode body (EA1) and the second electrode body (EA2), the calculation unit (940) can transmit the alignment position adjustment value data to the alignment control unit (900).

[0338] The alignment control unit (900) can operate the position adjustment unit (950). The position adjustment unit (950) can operate the first adjustment unit (260) and the second adjustment unit (570) through alignment position adjustment value data.

[0339] The position adjustment unit (950) can move the first electrode body (EA1) in the width direction (D2) by operating the first adjustment unit (260) or adjust the driving angle of the first electrode body (EA1) by rotating the first adjustment unit (260) on the plane (D1-D2).

[0340] In other words, the position adjustment unit (950) can adjust the driving position of the first electrode body (EA1) by adjusting the position of the first adjustment unit (260).

[0341] Additionally, the position adjustment unit (950) can move the second electrode body (EA2) in the width direction (D2) by operating the second adjustment unit (570) or adjust the driving angle of the second electrode body (EA2) by rotating the second adjustment unit (570) on the plane (D1-D2).

[0342] In other words, the position adjustment unit (950) can adjust the driving position of the second electrode body (EA2) by adjusting the position of the second adjustment unit (570).

[0343] Accordingly, the driving positions of the first electrode body (EA1) and the second electrode body (EA2) can be adjusted.

[0344] Afterwards, the alignment state between the first and second pattern parts (PH1, PH2) can be measured, and the driving position of the first and second electrode bodies (EA1, EA2) can be aligned (S60) again.

[0345]

[0346] If the alignment state between the first and second pattern parts (PH1, PH2) is measured and it is determined that there is no alignment error (No), the first and second electrode bodies (EA1, EA2) can be notched.

[0347] Notching the first and second electrode bodies (EA1, EA2) (S70) and stacking the bicell (BC) (S80) allows the notching part (700) to notch the bicell strap (PBC) to produce the bicell (BC) and the waste strap (ST).

[0348] The transfer unit (710) can supply the bicell strap (PBC) toward the punching unit (750). At this time, the upper feeder belt (727) and the lower feeder belt (737) each support the upper and lower parts of the bicell strap (PBC) and can supply the bicell strap (PBC) toward the punching unit (750).

[0349] The notching sensing unit (740) can photograph or sense the bicell strap (PBC) and measure whether the bicell strap (PBC) is moving in the forward direction. If the notching sensing unit (740) measures that the bicell strap (PBC) is not moving in the forward direction, the alignment control unit (900) can temporarily stop the process.

[0350] The punching unit (750) can punch the bicell strap (PBC) through the punch (772). Accordingly, the bicell (BC) is manufactured, and the bicell (BC) can be stored in the magazine unit (810). The waste strap (ST) can be discharged to the outside for disposal or recycled.

[0351] The secondary battery manufacturing apparatus (100) and the secondary battery manufacturing method according to the present invention can precisely measure the alignment state between a plurality of electrode bodies during a continuous manufacturing process of a battery cell through the structure and method described above. It can also precisely adjust the alignment position between a plurality of electrode bodies. Furthermore, it can precisely measure the alignment state between a gasket (GK) and an electrode body placed inside the gasket (GK) during a continuous manufacturing process of a battery cell. It can also precisely adjust the driving position of the electrode body. This can improve the productivity of the secondary battery.

[0352] Although preferred embodiments of the present invention have been described above, the present invention is not limited thereto and can be implemented with various modifications within the scope of the claims, the detailed description of the invention, and the attached drawings, and it is obvious that such modifications also fall within the scope of the present invention.

Claims

1. Forming a first electrode body; Forming a first pattern portion along the driving direction (D1) on the first electrode body; Laminating a gasket on the first electrode body; Laminating a counter electrode on the inner side of the gasket on the first electrode, wherein the first electrode and the counter electrode have different polarities; Forming a second electrode body, wherein the first and second electrode bodies have the same polarity; Forming a second pattern portion along the driving direction (D1) on the second electrode body; Joining the first electrode body, the counter electrode body, and the second electrode body; Measuring the alignment state between the first and second pattern parts to align the driving positions of the first and second electrode bodies; and Notching the above first and second electrode bodies; A method for manufacturing a secondary battery comprising 2. In Paragraph 1, The first pattern portion is formed on the unpatterned portion of the first electrode body, and A method for manufacturing a secondary battery, wherein the second pattern portion is formed on the unpatterned portion of the second electrode body.

3. In Paragraph 1, Each of the above first and second pattern parts is, A method for manufacturing a secondary battery formed in the shape of a through hole.

4. In Paragraph 3, The first and second pattern parts are each formed with through holes of the same shape, A method for manufacturing a secondary battery, wherein the alignment state between the first and second pattern parts is measured by whether the shapes of the first and second pattern parts match based on the vertical direction (D3).

5. In Paragraph 3, Each of the first and second pattern parts includes a plurality of through surfaces, and The plurality of penetrating surfaces of the first pattern portion include one or more first straight sections or one or more first segmented sections, and A method for manufacturing a secondary battery, wherein the plurality of penetrating surfaces of the second pattern portion include one or more second straight sections or one or more second section lines.

6. In Paragraph 5, Measuring the alignment state between the first and second pattern parts is, Measuring the alignment state between the first and second straight sections; and Measuring the alignment state between the first and second section lines; Includes, A method for manufacturing a secondary battery, wherein one or more of the following are measured: an alignment angle error value based on the driving direction (D1) between the first and second straight sections, a first alignment position error value based on the driving direction (D1) between the first and second section lines, and a second alignment position error value based on the width direction (D2) between the first and second straight sections.

7. In Paragraph 6, Measuring the alignment state between the first and second pattern parts and aligning the driving positions of the first and second electrode bodies is, If there is an alignment error between the first and second pattern parts (e.g.), Calculating the alignment error adjustment value between the first and second pattern parts; Adjusting one or more of the driving speed of the first electrode body, the driving position based on the width direction (D2), and the driving angle based on the driving direction (D1); and Adjusting one or more of the following: the driving speed of the second electrode body, the driving position based on the width direction (D2), and the driving angle based on the driving direction (D1); A method for manufacturing a secondary battery, further comprising 8. In Paragraph 1, Measuring the alignment state between the gasket and the counter electrode and aligning the driving position of the first electrode; A method for manufacturing a secondary battery, further comprising 9. In Paragraph 8, Measuring the alignment state between the above gasket and the above counter electrode and aligning the driving position of the above first electrode is, Measuring the gap error value between the two corners of the gasket and the two corners of the counter electrode based on the width direction (D2); A method for manufacturing a secondary battery comprising 10. In Paragraph 9, Measuring the alignment state between the above gasket and the above counter electrode and aligning the driving position of the above first electrode is, If the gap error value between both corners of the above gasket and both corners of the above counter electrode is not within the allowable error range (No), Calculating an alignment error adjustment value between the above gasket and the above counter electrode; and Adjusting one or more of the driving speed of the first electrode body, the driving position based on the width direction (D2), and the driving angle based on the driving direction (D1); A method for manufacturing a secondary battery, further comprising 11. In Paragraph 1, Further comprising laminating a gasket on the second electrode body; A method for manufacturing a secondary battery in which a gasket stacked on the second electrode and a gasket stacked on the first electrode are aligned at the same position based on the vertical direction (D3).

12. A first electrode supply unit that supplies a first electrode body; A gasket forming part that laminates a gasket on the first electrode body; A counter electrode supply unit that stacks a counter electrode on the inner side of the gasket on the first electrode body; A second electrode supply unit that supplies a second electrode onto the first electrode and the counter electrode; A joining portion that joins the first electrode body, the counter electrode body, and the second electrode body; A notching portion for notching the first and second electrode bodies; and Alignment control unit for aligning the driving positions of the first and second electrode bodies; including The above alignment control unit is, A pattern forming unit that forms a first pattern portion and a second pattern portion along a driving direction (D1) on the first electrode body and the second electrode body, respectively; and A position measuring unit that measures the alignment state between the first and second pattern parts and measures the alignment state between the first and second electrode bodies; A secondary battery manufacturing apparatus comprising 13. In Paragraph 12, The above pattern forming part is, A first pattern forming unit disposed between the first electrode supply unit and the gasket forming unit, wherein the first pattern forming unit forms a first pattern portion on the uncoated portion of the first electrode body; and It includes a second pattern forming unit disposed between the second electrode supply unit and the junction unit, and A secondary battery manufacturing apparatus in which the above-mentioned second pattern forming unit is configured to form a second pattern portion on the unpatterned portion of the above-mentioned second electrode body.

14. In Paragraph 13, The above first and second pattern sections are, A secondary battery manufacturing device formed in the shape of a through hole.

15. In Paragraph 14, The first and second pattern portions are each formed with through holes having a polygonal shape, and A secondary battery manufacturing apparatus in which the first and second pattern sections are formed with the same shape based on the vertical direction (D3).

16. In Paragraph 14, Each of the first and second pattern parts includes a plurality of through surfaces, and The plurality of penetrating surfaces of the first pattern portion include one or more first straight sections or one or more first curved lines, and A secondary battery manufacturing apparatus in which the plurality of penetrating surfaces of the second pattern portion include one or more second straight sections or one or more second segmented sections.

17. In Paragraph 16, The above position measuring unit is, An insert sensing unit disposed between the above-mentioned counter electrode supply unit and the above-mentioned joint unit, wherein the insert sensing unit measures a gap error value between the two corners of the gasket and the two corners of the counter electrode body based on the width direction (D2); and A bonding sensing member disposed between the bonding member and the notching member; comprising A secondary battery manufacturing apparatus configured such that the above-mentioned bonding sensing unit measures the alignment state between the first and second straight sections or the alignment state between the first and second section lines, and measures the alignment state between the first and second electrode bodies.

18. In Paragraph 17, The above-mentioned bonding sensing unit is, A secondary battery manufacturing apparatus that measures one or more of the following: a first alignment position error value based on the driving direction (D1) between the first and second section lines, a first alignment angle error value based on the driving direction (D1) between the first and second straight sections, and a second alignment position error value based on the width direction (D2) between the first and second straight sections.

19. In Paragraph 18, The above alignment control unit is, A calculation unit for calculating driving position adjustment values ​​of the first and second electrode bodies; further comprising The above operation unit is, Calculate the driving position adjustment value of the first electrode body through the gap error value between the two corners of the gasket and the two corners of the counter electrode body, and A secondary battery manufacturing apparatus configured to calculate an alignment position adjustment value of the first electrode or the second electrode through the alignment position between the first and second pattern parts.

20. In Paragraph 19, The above alignment control unit is, It further includes a position adjustment unit for adjusting the driving positions of the first and second electrode bodies; and The above position adjustment unit is, A secondary battery manufacturing apparatus configured to adjust one or more of the driving speed of the first and second electrode bodies, the driving position based on the width direction (D2), and the driving angle based on the driving direction (D1).

Images