Electrode assembly, apparatus for manufacturing electrode assembly, apparatus for manufacturing half cell sheet, and method for manufacturing electrode assembly

Abstract

An electrode assembly according to one embodiment of the present invention comprises a first electrode half-cell sheet folded in a zigzag pattern and a second electrode plate interposed between the folded first electrode half-cell sheets, wherein the first electrode half-cell sheet has a separator sheet attached to the upper and lower surfaces of a sheet-shaped first electrode, and each of the folded regions of the first electrode half-cell sheet includes a dotted line-shaped cut line along the longitudinal direction of the electrode assembly, and the sheet-shaped first electrode and the separator sheet penetrate through the cut line, and the sheet-shaped first electrode and the second electrode plate may have different polarities.

Description

Technology Field

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0154614 filed November 4, 2024, and all contents disclosed in the document of said Korean patent application are incorporated herein as part of this specification.

[0003] The present invention relates to an electrode assembly, an apparatus for manufacturing an electrode assembly, an apparatus for manufacturing a half-cell sheet, and a method for manufacturing an electrode assembly. More specifically, the invention relates to providing an apparatus for manufacturing an electrode assembly and a method for manufacturing an electrode assembly with improved productivity, and to providing an electrode assembly with improved electrode quality. Background Technology

[0004] In modern society, as the use of portable devices such as mobile phones, laptops, camcorders, and digital cameras, as well as energy storage systems (ESS), has become commonplace, the development of technologies in related fields is becoming active. Furthermore, rechargeable secondary batteries are being utilized as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) as a solution to address air pollution caused by conventional gasoline vehicles using fossil fuels; consequently, the need for the development of secondary batteries is increasing.

[0005] Currently commercialized rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium-ion batteries. Among these, lithium-ion batteries are receiving the most attention due to their advantages of free charging and discharging, low self-discharge rate, and high energy density.

[0006] These lithium secondary batteries primarily use lithium-based oxides and carbon materials as the positive and negative active materials, respectively. The lithium secondary battery comprises an electrode assembly in which a positive plate and a negative plate, each coated with the positive and negative active materials, are arranged with a separator in between, and an outer casing, namely a battery case, that seals and houses the electrode assembly together with an electrolyte.

[0007] Such electrode assemblies may consist of a jelly-roll type assembly having a structure in which a separator is interposed between sheet-type anodes and cathodes and then wound, a stack type assembly consisting of unit cells having a structure in which rectangular anodes and cathodes are stacked with a separator interposed between them, a stack-folding type assembly in which unit cells are wound by a long separating film, or a lamination-stack type assembly in which unit cells are stacked with a separator interposed between them and attached to one another.

[0008] Among these, FIGS. 1 and 2 illustrate a process for manufacturing an electrode assembly using conventional zigzag stacking.

[0009] First, referring to FIG. 1, a negative plate (1) is manufactured by cutting a negative sheet into cell units, and a positive plate (2) is manufactured by cutting an positive sheet into cell units likewise. A plurality of negative plates (1) and a plurality of positive plates (2) are each loaded into a storage unit.

[0010] Referring to FIG. 2, a separator sheet (3) is provided on a stack unit (4) in a zigzag folded manner, and a negative plate (1) and a positive plate (2) with different polarities are alternately provided on both sides with the stack unit (4) in between. In a method in which one negative plate (1) and one positive plate (2) with different polarities are alternately inserted from each side into the separator sheet (3) that is folded in a zigzag manner, one negative plate (1) and one positive plate (2) are supplied for each cycle in which the separator sheet (3) is extended to one side, folded, and then extended to the other side.

[0011] Accordingly, there is a need for an apparatus and method for manufacturing an electrode assembly with improved quality while further enhancing the productivity of the electrode assembly compared to such conventional technology. The problem to be solved

[0012] The present invention aims to provide an apparatus for manufacturing an electrode assembly with improved productivity and a method for manufacturing an electrode assembly, and to provide an electrode assembly with improved electrode quality.

[0013] However, the problems that the embodiments of the present invention aim to solve are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention. means of solving the problem

[0014] An electrode assembly according to one embodiment of the present invention comprises a first electrode half-cell sheet folded in a zigzag pattern and a second electrode plate interposed between the folded first electrode half-cell sheets, wherein the first electrode half-cell sheet has a separator sheet attached to the upper and lower surfaces of a sheet-shaped first electrode, and each of the folded regions of the first electrode half-cell sheet includes a dotted line-shaped cut line along the longitudinal direction of the electrode assembly, and the sheet-shaped first electrode and the separator sheet penetrate through the cut line, and the sheet-shaped first electrode and the second electrode plate may have different polarities.

[0015] The structure may have a second electrode plate provided alternately on one side and the other side of the electrode assembly between the first electrode half-cell sheets folded above.

[0016] When viewed from one side of the electrode assembly, the separator sheet and the second electrode plate are alternately stacked, and each of the folded regions of the separator sheet may include the dotted line-shaped cut line.

[0017] The first electrode half-cell sheet may further include a fold line in which the first electrode in the form of the sheet is pressed in each of the folded regions.

[0018] The dotted line-shaped cut line of the first electrode half-cell sheet and the fold line of the first electrode in the sheet shape may coincide with each other.

[0019] An electrode assembly according to another embodiment of the present invention, wherein a negative plate and an anode plate are alternately arranged between zigzag-folded separator sheets, includes a dotted line-shaped cut line along the length direction of the electrode assembly in each of the folded regions of the separator sheets, and the separator sheets may be penetrated through the cut line.

[0020] When viewed from either side of the electrode assembly, either the negative plate or the positive plate is laminated between the separator sheets, and the separator sheets may include a dotted line in each of the folded regions.

[0021] An electrode assembly manufacturing device according to one embodiment of the present invention comprises: a first electrode half-cell sheet guide unit that provides a first electrode half-cell sheet in which a separator sheet is combined with the upper and lower surfaces of a first electrode in the form of a sheet; a stack unit in which an electrode assembly is stacked by interposing a second electrode plate between the folded first electrode half-cell sheets; and a pair of second electrode supply units disposed on both sides of the stack unit and alternately providing the second electrode plate, wherein each of the folded regions of the first electrode half-cell sheet includes a dotted line-shaped cut line along the longitudinal direction of the electrode assembly, and the first electrode in the form of a sheet and the separator sheet are penetrated through the cut line, and the first electrode in the form of a sheet and the second electrode plate may have different polarities.

[0022] Each of the above pair of second electrode supply units can alternately provide the second electrode plate between the folded first electrode half-cell sheets on one side and the other side of the electrode assembly, respectively.

[0023] (S1) A process in which the first electrode half-cell sheet is placed on the stack unit while extending in one direction; (S2) A process in which the second electrode plate provided from the other side of the stack unit is placed on the first electrode half-cell sheet of the stack unit; (S3) A process in which the first electrode half-cell sheet is placed on the stack unit while extending in the other direction; and (S4) A process in which the second electrode plate provided from one side of the stack unit is placed on the first electrode half-cell sheet of the stack unit may be performed in sequence.

[0024] The above processes (S1) to (S4) can be repeated in multiple cycles.

[0025] After the first electrode half-cell sheet is extended in one direction and seated on the stack unit, the second electrode plate is provided from a second electrode supply unit located on the other side of the stack unit and seated on the first electrode half-cell sheet on the stack unit, and after the first electrode half-cell sheet is extended in the other direction and seated, the second electrode plate is provided from a second electrode supply unit located on one side of the stack unit and seated on the first electrode half-cell sheet on the stack unit.

[0026] When the first electrode half-cell sheet is extended in the other direction, the first electrode half-cell sheet is folded on one side of the electrode assembly and covers the second electrode plate, and when the first electrode half-cell sheet is extended in the one direction, the first electrode half-cell sheet is folded on the other side of the electrode assembly and covers the second electrode plate.

[0027] It may further include a dotted line cutting unit disposed at the front end of the first electrode half-cell sheet guide unit and forming the dotted line-shaped incision line at predetermined intervals on the first electrode half-cell sheet.

[0028] The above dotted line cutting unit includes a plurality of cutting knives, and the plurality of cutting knives are arranged in a row along the width direction of the first electrode half-cell sheet and can be spaced apart by a predetermined distance between adjacent cutting knives.

[0029] A first electrode half-cell sheet manufacturing apparatus according to one embodiment of the present invention comprises: a lamination unit that forms a first electrode half-cell sheet by combining a separator sheet on each of the upper and lower surfaces of a first electrode in the form of a sheet; and a dotted line cutting unit disposed at the rear end of the lamination unit and forming a dotted line incision line at a predetermined interval on the first electrode half-cell sheet, wherein the first electrode in the form of a sheet and the separator sheet may be penetrated through the incision line.

[0030] The above dotted line cutting unit includes a plurality of cutting knives, and

[0031] The plurality of cutting knives mentioned above may be arranged in a line along a direction orthogonal to the direction of travel of the first electrode half-cell sheet and spaced apart by a predetermined distance between adjacent cutting knives.

[0032] The apparatus further includes a bending unit disposed at the front end of the lamination unit and forming bending lines at predetermined intervals on the sheet-shaped first electrode, wherein the bending lines may be a portion where the thickness of the sheet-shaped first electrode is relatively thinned by the sheet-shaped first electrode being pressed by the bending unit.

[0033] The bending unit includes a bending knife that forms the bending line, and the bending knife may be arranged in the width direction of the first electrode in the form of a sheet.

[0034] The dotted line-shaped cut line of the first electrode half-cell sheet and the fold line of the first electrode in the sheet shape may coincide with each other.

[0035] An electrode assembly according to another embodiment of the present invention, wherein a negative plate and an anode plate are alternately arranged between zigzag-folded separator sheets, includes a dotted line-shaped cut line along the length direction of the electrode assembly in each of the folded regions of the separator sheets, and the separator sheets may be penetrated through the cut line.

[0036] When viewed from either side of the electrode assembly, either the negative plate or the positive plate is laminated between the separator sheets, and the separator sheets may include a dotted line in each of the folded regions.

[0038] An electrode assembly manufacturing apparatus according to another embodiment of the present invention comprises: a stack unit in which an electrode assembly is stacked such that a negative plate and an anode plate are alternately arranged between zigzag-folded separator sheets; a separator guide unit that provides the separator sheets; and a pair of electrode supply units that each provide the negative plate and the anode plate to the stack unit, wherein each of the folded regions of the separator sheets includes a dotted line-shaped cut line along the longitudinal direction of the electrode assembly, and the separator sheets may be penetrated through the cut line.

[0039] It may further include a dotted line cutting unit positioned at the front of the above-mentioned membrane guide unit and forming the dotted line-shaped cut lines on the membrane sheet at predetermined intervals.

[0040] The above dotted line cutting unit includes a plurality of cutting knives, and the plurality of cutting knives are arranged in a row along the width direction of the separator sheet and can be spaced apart by a predetermined distance between adjacent cutting knives.

[0041] The device further includes a separator supply unit that provides a separator sheet wound in a roll type, and the separator sheet wound in a roll type may include the cut line.

[0042] A method for manufacturing an electrode assembly according to an embodiment of the present invention may include: (S1) a step of mounting the first electrode half-cell sheet on a stack unit while extending in one direction; (S2) a step of mounting the second electrode plate provided from the other side of the stack unit on the first electrode half-cell sheet of the stack unit; (S3) a step of mounting the first electrode half-cell sheet on the stack unit while extending in the other direction; and (S4) a step of mounting the second electrode plate provided from one side of the stack unit on the first electrode half-cell sheet of the stack unit.

[0043] The above steps (S1) to (S4) can be repeated in a plurality of cycles. Effects of the invention

[0044] According to the present invention, the production speed of the electrode assembly manufacturing process can be improved.

[0045] In addition, as the production speed of the electrode assembly increases based on this single manufacturing device, the number of devices required for the process can be reduced, thereby improving space utilization.

[0046] In addition, folding is easily performed in the folding region of the electrode assembly while preventing electrode breakage in that region, and the electrolyte can be more easily impregnated into the interior of the electrode assembly through the dotted incision line. Accordingly, the quality of the electrode assembly can be improved.

[0047] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims. Brief explanation of the drawing

[0048] FIGS. 1 and 2 illustrate a process for manufacturing an electrode assembly using conventional zigzag stacking. FIG. 3 illustrates an electrode assembly manufacturing apparatus (100) according to one embodiment of the present invention. FIG. 4 illustrates a first electrode half-cell sheet manufacturing apparatus (200) according to one embodiment of the present invention. FIG. 5 is a reference drawing of FIG. 4 and shows a dotted line cutting unit (210), which is a component of the first electrode half-cell sheet manufacturing device (200) of FIG. 4. FIG. 6 is a reference drawing of FIG. 4 and illustrates a folding unit (230), which is a component of the first electrode half-cell sheet manufacturing device (200) of FIG. 4. FIG. 7 illustrates a method of manufacturing a second electrode plate (20) according to one embodiment of the present invention. FIG. 8 illustrates an electrode assembly (1000) manufactured according to the embodiments described above in FIG. 3 to 7. FIG. 9 shows the electrode assembly (1000) of FIG. 8 from a different angle. FIG. 10 illustrates a modified embodiment of the embodiment described above in FIG. 3 to 5. FIG. 11 is a flowchart of a method for manufacturing an electrode assembly according to one embodiment of the present invention. FIG. 12 illustrates an electrode assembly manufacturing apparatus (400) according to another embodiment of the present invention. FIG. 13 illustrates an electrode assembly (2000) manufactured according to the embodiment described above in FIG. 12. Specific details for implementing the invention

[0049] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0050] To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0051] Furthermore, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, and thus the present invention is not necessarily limited to what is illustrated. Thicknesses have been enlarged in the drawings to clearly represent various layers and regions. Additionally, for convenience of explanation, the thickness of some layers and regions has been exaggerated in the drawings.

[0052] Furthermore, when a part such as a layer, membrane, region, or plate is said to be "on" or "on" another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when a part is said to be "directly above" another part, it means that there is no other part in between. Also, saying that a part is "on" or "on" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "on" or "on" facing the opposite direction of gravity.

[0053] Furthermore, throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0054] Additionally, throughout the specification, "planar" means when the subject part is viewed from above, and "cross-sectional" means when the cross-section obtained by vertically cutting the subject part is viewed from the side.

[0055] Hereinafter, an electrode assembly, an apparatus for manufacturing an electrode assembly, and a method for manufacturing an electrode assembly according to one embodiment of the present invention will be described with reference to the drawings.

[0056] FIG. 3 illustrates an electrode assembly manufacturing apparatus (100) according to one embodiment of the present invention.

[0057] Referring to FIG. 3, the electrode assembly manufacturing device (100) includes a stack unit (110), a first electrode half-cell sheet guide unit (120), and a pair of second electrode supply units (130). Here, the first electrode and the second electrode are electrodes with different polarities from each other. That is, the first electrode is either a negative electrode or a positive electrode, and the second electrode is the other of a negative electrode and a positive electrode.

[0058] As will be described in detail later, in the electrode assembly manufacturing device (100) according to the present invention, the first electrode is provided in the form of a half-cell sheet in which an electrode sheet and a separator sheet are combined, and the second electrode is provided in the form of an electrode plate in the shape of a single sheet.

[0059] First, the stack unit (110) is in the shape of a plate or table, and it is sufficient if the electrode assembly (1000, see FIG. 8) can be stacked on a flat upper surface, and it can be appropriately modified and changed to suit the environment in which the present invention is implemented. A first electrode half-cell sheet (H) and a second electrode plate (20) are alternately placed on the stack unit (110).

[0060] A holding member (111) is additionally provided on the stack unit (110) to hold the first electrode half-cell sheet (H) and the second electrode plate (20), thereby allowing the stacking of the electrode assembly (1000) to proceed. The holding member (111) may be, for example, a mandrel, but is not limited thereto and various modifications and changes are possible.

[0061] Additionally, the first electrode half-cell sheet guide unit (120) provides the first electrode half-cell sheet (H) on the stack unit (110). For example, as shown in FIG. 3, the first electrode half-cell sheet guide unit (120) can alternately move between one side and the other side of the stack unit (110) on the stack unit (110). Alternatively, although not illustrated in the present invention, in the opposite case, the stack unit (110) can alternately move between the other side and one side with the first electrode half-cell sheet guide unit (120) in between while the first electrode half-cell sheet guide unit (120) is fixed in the middle.

[0062] In any one or a combination of the above-described implementation methods, the first electrode half-cell sheet (H) may be folded near one side and the other side of the stack unit (110), respectively, and stacked in a zigzag shape on the stack unit (110). In summary, when the half-cell sheet (H) alternately extends between the one-sided direction and the other-sided direction, the first electrode half-cell sheet guide unit (120) and the stack unit (110) may move in relatively opposite directions to each other.

[0063] For reference, regarding the one-sided and other-sided directions in which the half-cell sheet (H) extends in the drawings of the present invention, in the drawings from Fig. 3 onwards, for convenience, when the direction in which the electrode assembly is stacked is set as the z-axis, the one-sided direction is depicted as the -x-axis direction and the other-sided direction is depicted as the +x-axis direction. However, the present invention is not limited to what is depicted, and various modifications and changes are possible, such as implementing the one-sided direction as the +x-axis direction and the other-sided direction as the -x-axis direction.

[0064] The first electrode half-cell sheet guide unit (120) may be, for example, a pair of guide members (e.g., roller shape), but the present invention is not limited thereto, and it is sufficient as long as the first electrode half-cell sheet (H) can be drawn out and guided, and the present invention can be appropriately modified and changed to suit the environment in which it is implemented.

[0065] With reference to FIGS. 4 and 5, the first electrode half-cell sheet (H) is manufactured by combining a separator sheet (30) above the upper surface and below the lower surface of the first electrode (10) (i.e., the first electrode (10) in sheet form) which is notched in cell units and arranged in a row in multiple units. The manufacturing process of the first electrode half-cell sheet (H) will be described in more detail later in FIG. 4.

[0066] For example, the first electrode half-cell sheet (H) manufactured in FIG. 4 can be wound into a roll shape and then unwound again in the electrode assembly manufacturing device (100) of FIG. 3 and provided onto the stack unit (110).

[0067] A pair of second electrode supply units (130) are each positioned on both sides of the stack unit (110), with the stack unit (110) in between. Each of the second electrode supply units (130) has a plurality of second electrode plates (20) loaded thereon, for example, and can be magazine-sized. Each of the second electrode supply units (130) positioned on both sides of the stack unit (110) alternately provides the second electrode plates (20) one by one onto the stack unit (110).

[0068] An alignment unit (140) may be additionally provided between the stack unit (110) and the second electrode supply unit (130). A second electrode plate (20) picked up as a sheet from the second electrode supply unit (130) is placed on the alignment unit (140) and inspected for misalignment, defects, etc. of the second electrode plate (20) using a vision unit (150, e.g., a camera). Afterward, the second electrode plate (20) that is determined to be normal and correctly aligned can be picked up again from the alignment unit (140) and provided onto the stack unit (110).

[0069] Referring to FIG. 7, a second electrode sheet (E2) is notched and cut into individual sheets by an electrode plate cutting unit (300) to produce a second electrode plate (20), and then a plurality of second electrode plates (20) are loaded into a second electrode supply unit (130). For other details regarding the method of manufacturing the second electrode plate (20) by cutting into individual sheets, refer to the conventional electrode plate manufacturing method.

[0070] Referring again to FIG. 3, the stacking process of the electrode assembly (1000) on the stack unit (110) is described as follows.

[0071] First, a first electrode half-cell sheet (H) is placed on the stack unit (110) while extending in one direction (hereinafter referred to as process “S1”).

[0072] Here, for example, the first electrode half-cell sheet guide unit (120) may be provided so that it moves in one direction over the stack unit (110), and the first electrode half-cell sheet (H) extends in one direction over the stack unit (110). Alternatively, the first electrode half-cell sheet guide unit (120) may be fixed in the middle, and the stack unit (110) may be provided so that it moves in the other direction, and the first electrode half-cell sheet (H) extends in one direction over the stack unit (110). Or, it may be implemented by combining the above-described implementation methods.

[0073] Next, a second electrode plate (20) provided from the other side of the stack unit (110) is placed on the first electrode half-cell sheet (H) of the stack unit (110) (hereinafter referred to as process “S2”). More specifically, a second electrode plate (20) is provided from a second electrode supply unit (130) located on the other side of the stack unit (110), and the second electrode plate (20) is placed on the first electrode half-cell sheet (H) that was extended in one direction on the stack unit (110).

[0074] Next, a first electrode half-cell sheet (H) is placed on the stack unit (110) while extending in the other direction (hereinafter referred to as process “S3”). To elaborate, the first electrode half-cell sheet (H) is placed on the second electrode plate (20) placed on the stack unit (110) in process S2 while extending in the other direction. The first electrode half-cell sheet (H) is folded on one side of the electrode assembly (1000).

[0075] Here, for example, the first electrode half-cell sheet guide unit (120) may be provided so that it moves in a different direction over the stack unit (110), thereby extending the first electrode half-cell sheet (H) over the stack unit (110) in a different direction. Alternatively, the first electrode half-cell sheet guide unit (120) may be fixed in the middle, and the stack unit (110) may be provided so that it moves in one direction, thereby extending the first electrode half-cell sheet (H) over the stack unit (110) in a different direction. Or, it may be implemented by combining the above-described implementation methods.

[0076] Next, a second electrode plate (20) provided from one side of the stack unit (110) is placed on the first electrode half-cell sheet (H) of the stack unit (110) (hereinafter referred to as process “S4”). More specifically, a second electrode plate (20) is provided from a second electrode supply unit (130) located on one side of the stack unit (110), and the second electrode plate (20) is placed on the first electrode half-cell sheet (H) that was extended in the other direction on the stack unit (110).

[0077] Next, process S1 is repeated. That is, the first electrode half-cell sheet (H) is placed over the second electrode plate (20) placed on the stack unit (110) in process S4, extending in one direction. The first electrode half-cell sheet (H) is folded on the other side of the electrode assembly (1000).

[0078] In the manner described above, as processes S1 to S4 are repeated in a plurality of cycles, stacking of the electrode assembly (1000) is carried out on the stack unit (110). Accordingly, an electrode assembly (1000) as shown in FIG. 8 is manufactured.

[0079] The height of the stack unit (110) is adjusted in the vertical direction as processes S1 to S4 proceed and as processes S1 to S4 are repeated in multiple cycles. To elaborate, after one cycle of processes S1 to S4 is completed, the height is adjusted to the combined height of the two layers of half-cell sheets (H) and the two second electrode plates (20).

[0080] To elaborate, since the height of each of the first electrode half-cell sheet (H) and the second electrode plate (20) is relatively very small compared to the width of each of the first electrode half-cell sheet (H) and the second electrode plate (20) per unit, it is reasonable to consider the height correction of the stack unit (110) in the vertical direction as a change within the error range. That is, since the height value corrected in the vertical direction of the stack unit (110) is very small compared to the distance the stack unit (110) moves in one direction or the other, the expression "correction" was used instead of the expression "movement" in the vertical direction in the specification of the present invention.

[0081] Meanwhile, in the conventional technology, one negative plate (1) and one positive plate (2) are supplied per cycle in which a separator sheet (3) is extended to one side and then folded and extended to the other side (see FIGS. 1 and 2).

[0082] On the other hand, in the electrode assembly manufacturing apparatus (100) according to the present invention, two cathodes and two anodes are supplied for each of the stacking processes (i.e., processes S1 to S4) of one cycle. To elaborate, two cathodes and two anodes with different polarities are supplied for each of the cycles in which a first electrode half-cell sheet (H), comprising a first electrode (10) and a separator sheet (30), is extended to one side and then folded and extended to the other side. Here, one of the cathodes and anodes is provided as a first electrode (10) in the form of a sheet, and the other of the cathodes and anodes is provided as a second electrode plate (20) in the form of a sheet.

[0083] Accordingly, in the electrode assembly manufacturing device (100) according to one embodiment of the present invention, productivity is improved compared to the prior art.

[0084] FIG. 4 illustrates a first electrode half-cell sheet manufacturing apparatus (200) according to an embodiment of the present invention. FIG. 5 is a reference drawing of FIG. 4 and illustrates a dotted line cutting unit (210), which is a component of the first electrode half-cell sheet manufacturing apparatus (200). FIG. 6 is a reference drawing of FIG. 4 and illustrates a folding unit (230), which is a component of the first electrode half-cell sheet manufacturing apparatus (200).

[0085] Referring to FIG. 4, the first electrode half-cell sheet manufacturing device (200) manufactures a first electrode half-cell sheet (H) by combining a separator sheet (30) above the upper surface and below the lower surface of a first electrode (10) (i.e., a sheet-shaped first electrode (10)) arranged in a row in multiple units. The first electrode half-cell sheet manufacturing device (200) of FIG. 4 includes a dotted line cutting unit (210) and a lamination unit (220).

[0086] First, the lamination unit (220) combines (laminates) a separator sheet (30) above and below the upper surface of a first electrode (10) (i.e., a sheet-shaped first electrode (10)) arranged in a row in multiple units, thereby forming a first electrode half-cell sheet (H).

[0087] Referring to FIGS. 4 and 5, the dotted line cutting unit (210) cuts a dotted line (L) in the first electrode half-cell sheet (H). c ) forms. The dotted line cutting unit (210) includes a plurality of cutting knives (211) arranged in a row, and forms a dotted line-shaped incision line (L c Adjacent cutting knives (211) are spaced apart by a predetermined distance to form a ). Additionally, a plurality of cutting knives (211) arranged in a row are arranged in the width direction of the first electrode half-cell sheet (H) (i.e., a direction orthogonal to the direction of travel of the first electrode half-cell sheet (H)). In FIG. 5 of the present invention, the width direction of the first electrode half-cell sheet (H) is illustrated exemplarily in the y-axis direction.

[0088] The dotted line cutting unit (210) presses the first electrode half-cell sheet (H) with a cutting knife (211) at predetermined intervals (one cell unit) to cut a line (L c ...can form .... To elaborate, the dotted line cutting unit (210) can form a dotted line incision (L) at once on the first electrode (10) and the separator sheet (30) aligned with its upper and lower surfaces. c It forms a cutting knife (211). The cutting knife (211) is formed to be sharper (more acute) than the bending knife (231) of the bending unit (230) described later, so that it can penetrate the upper and lower parts of the first electrode half-cell sheet (H).

[0089] A dotted line-shaped incision (L) formed on the first electrode half-cell sheet (H) c The first electrode half-cell sheet (H) can be folded more easily along ). That is, at the folding portion (F) of the first electrode half-cell sheet (H) of the electrode assembly (1000) of FIG. 8, a dotted line-shaped cut line (L c It can be folded more easily along ).

[0090] In addition, as described below, a bending line (L) is additionally formed on the first electrode sheet (E1) by a bending unit (230). b ) is formed, and the corresponding bend line (L b Even if the first electrode half-cell sheet (H) is folded along ), a dotted line-shaped cut line (L) is formed on the first electrode half-cell sheet (H) described above by the dotted line cutting unit (210). c By forming ), unwanted breakage of the electrode active material layer (A) in the folding portion (F) of the first electrode half-cell sheet (H) of the electrode assembly (1000) can be prevented.

[0091] In addition, a dotted line-shaped cut line (L) in the folding portion (F) of the first electrode half-cell sheet (H) of the electrode assembly (1000). c Since ) is formed, consequently, on both sides of the separator sheet (30) laminated on the electrode assembly (1000), a dotted line-shaped cut line (L) is formed. c) is formed. That is, on both sides of the electrode assembly (1000), not only the separator sheet (30) but also the electrode active material layer (A) and current collector (C) of the first electrode sheet (E1) are penetrated in a dotted line shape. Accordingly, the corresponding dotted line shape cut line (L c The electrolyte can be more easily introduced into the electrode assembly (1000) through the electrode assembly (1000).

[0092] Meanwhile, FIG. 5 illustrates, by way of example, a case in which a plurality of cutting knives (211) arranged in a row are provided as a set in a dotted line cutting unit (210). However, the present invention is not limited thereto, and a plurality of cutting knives (211) arranged in a row may be provided as a plurality of sets, and the plurality of cutting knives (211) arranged in a row in each set may be spaced apart from each other at equal intervals along the circumference of the dotted line cutting unit (210). The spacing between each set of the plurality of cutting knives (211) arranged in a row is substantially the same as the width of the electrode assembly (1000).

[0093] Referring to FIGS. 4 and 6, the first electrode half-cell sheet manufacturing apparatus (200) may additionally include a folding unit (230). The folding unit (230) includes a folding knife (231), and the folding knife (231) is positioned in the width direction of the first electrode sheet (E1) (i.e., a direction orthogonal to the direction of travel of the first electrode sheet (E1)). In FIG. 4 of the present invention, the width direction of the first electrode sheet (E1) is illustrated exemplarily in the y-axis direction.

[0094] The bending unit (230) presses the first electrode sheet (E1) with a bending knife (231) at predetermined intervals (cell units) to form a bending line (L b ) can be formed. On the first electrode sheet (E1), a fold line (L) is formed for each cell unit (for each width of the electrode assembly (1000)). b) can be formed. Accordingly, a fold line (L) at the folding portion (F) of the first electrode half-cell sheet (H) of the electrode assembly (1000) of FIG. 8 can be formed. b It allows it to be folded more easily along ).

[0095] The bending unit (230) may be composed of a pair of sub-units, and the first electrode sheet (E1) may be pressed as it passes between the pair of sub-units. Although FIG. 4 illustrates a case where the bending knife (231) is provided only in the upper sub-unit, the present invention is not limited thereto and various modifications and changes are possible, such as providing it in the lower sub-unit as well. In addition, the bending unit (230) creates a bending line (L) only on the electrode active material layer (A) of the first electrode sheet (E1). b ) may be formed, but in some cases, pressure is also applied to the current collector (C), so a bend line (L) is also formed on the current collector (C). b ) may also be formed.

[0096] That is, the bend line (Lb) refers to the area where the thickness of the first electrode sheet (E1) becomes relatively thin as the first electrode sheet (E1) is pressed by the bending knife (231). More specifically, the bend line (L b In this case, the thickness of the electrode active material layer (A) of the first electrode sheet (E1) may be relatively thin, and in some cases, the current collector (C) may remain while the electrode active material layer (A) above it may be removed by pressure applied by the bending knife (231). In addition, in some cases, the thickness of the current collector (C) may also be reduced by pressure applied by the bending knife (231).

[0097] A plurality of bending knives (231) may be provided, and the plurality of bending knives (231) may be spaced apart from each other at equal intervals along the circumference of the bending unit (230). The spacing between the bending knives (231) is substantially the same as the width of the electrode assembly (1000).

[0098] In addition, the bend line (L) formed by the bending unit (230) b ) is a dotted line-shaped incision line (L) formed by the above-described dotted line cutting unit (210). c It may be consistent with ).

[0099] A bending line (L) on the first electrode sheet (E1) by the bending unit (230) b ) is formed (optional), and when a separator sheet (30) is joined to the upper and lower surfaces of the first electrode sheet (E1) respectively by a lamination unit (220), a first electrode half-cell sheet (H) is formed.

[0100] In addition, the first electrode half-cell sheet manufacturing apparatus (200) may include a drying unit (240) for drying an electrode active material layer (A) applied on a current collector (C) of the first electrode sheet (E1), a notching unit (250) for notching the first electrode sheet (E1) in cell units, and a guide roller (260) for guiding the movement of the first electrode sheet (E1). Since the drying unit (240), the notching unit (250), and the guide roller (260) can be implemented by employing units used in a conventional electrode process, a detailed description is omitted.

[0101] Meanwhile, the first electrode half-cell sheet manufacturing device (200) described above in FIGS. 4 to 6 may be implemented by being integrally integrated with the electrode assembly manufacturing device (100) of FIG. 3, or it may be implemented separately from the electrode assembly manufacturing device (100) of FIG. 3. That is, it can be appropriately adopted and implemented to suit the process environment, etc. in which the present invention is implemented.

[0102] FIG. 7 illustrates a method of manufacturing a second electrode plate (20) according to an embodiment of the present invention. As described above, the second electrode sheet (E2) is notched and cut into individual sheets using an electrode plate cutting unit (300) to manufacture the second electrode plate (20). Since other descriptions overlap with those described above, please refer to the description above.

[0103] FIG. 8 illustrates an electrode assembly (1000) manufactured according to the embodiments described above in FIG. 3 to 7. FIG. 9 illustrates the electrode assembly (1000) of FIG. 8 from a different angle.

[0104] In the electrode assembly (1000), a first electrode half-cell sheet (H) and a second electrode plate (20) are alternately stacked. The first electrode half-cell sheet (H) is alternately folded on one side and the other side of the electrode assembly (1000) (see folding area (F)) and stacked in a zigzag shape, and the structure has a second electrode plate (20) alternately inserted between the folded first electrode half-cell sheets (H) on both sides.

[0105] As described above in FIGS. 2 to 7, the first electrode half-cell sheet (H) has a separator sheet (30) attached above the upper surface and below the lower surface of the first electrode (10) in the form of a sheet, respectively. The first electrode is either a negative electrode or an anode. The second electrode plate (20) is cut into individual sheets and is the other of a negative electrode or an anode. That is, the first electrode and the second electrode are electrodes with different polarities from each other.

[0106] Consequently, in the electrode assembly (1000) of FIG. 8, multiple layers are stacked in the order of separator sheet (30) - first electrode (10) - separator sheet (30) - second electrode plate (20). Additionally, in the folding areas (F) on both sides of the electrode assembly (1000), (the areas where the separator sheet (30) is exposed and folded when viewed from each side of the electrode assembly (1000)), a dotted line-shaped cut line (L c ) is formed in the length direction (y-axis direction in FIG. 8) of the electrode assembly (1000). In FIG. 8, the x-axis direction represents the width direction of the electrode assembly (1000), the y-axis direction represents the length direction of the electrode assembly (1000), and the z-axis direction represents the stacking (height) direction of the electrode assembly (1000).

[0107] In addition, as described above, a dotted line incision (Lc ) penetrates the first electrode (10) and the separator sheet (30) joined to the upper and lower surfaces of the first electrode, respectively, in a dotted line shape.

[0108] Referring to FIG. 9, when viewing the electrode assembly (1000) of FIG. 8 from one side (e.g., in the -x-axis direction of FIG. 8), a folded separator sheet (30) and a second electrode plate (20) are alternately stacked. In the area where the separator sheet (30) is exposed and folded, a dotted line-shaped cut line (L) as described above is shown. c ) is formed.

[0109] FIG. 10 illustrates a modified embodiment of the embodiment described above in FIG. 3 to 5.

[0110] In FIGS. 3 to 5, a dotted line-shaped cut line (L) is formed by a dotted line cutting unit (210) in the first electrode half-cell sheet manufacturing device (200) of FIGS. 4 and 5. c A process of manufacturing an electrode assembly (1000) by forming a first electrode half-cell sheet (H), winding the first electrode half-cell sheet (H) into a roll type, and then unwinding the first electrode half-cell sheet (H) in the electrode assembly manufacturing device (100) of FIG. 3 is illustrated as an exemplary embodiment.

[0111] However, the present invention is not limited thereto, and in some cases, the dotted line cutting unit (210) may be integrated into the electrode assembly manufacturing device (100). The dotted line cutting unit (210) is positioned at the front end of the first electrode half-cell guide unit (120) and cuts a dotted line shape (L) as described above on the first electrode half-cell sheet (H) being unwound. c It may be formed and then passed through the first electrode half-cell guide unit (120) and provided onto the stack unit (110).

[0112] To elaborate, the first electrode half-cell sheet (H), which has been laminated in the first electrode half-cell sheet manufacturing device (200) of FIG. 4, is wound into a roll type by the lamination unit (220), and then the first electrode half-cell sheet (H) is unwound again in the electrode assembly manufacturing device (100) of FIG. 10, and the above-described dotted line-shaped cut line (L) on the unwound first electrode half-cell sheet (H). c It could also be forming ).

[0113] Details regarding other components, etc., overlap with those described in FIGS. 3 to 9, so please refer to the descriptions above.

[0114] FIG. 11 illustrates a flowchart of a method for manufacturing an electrode assembly according to one embodiment of the present invention.

[0115] First, a step (S0) of manufacturing a first electrode half-cell sheet (H) is performed. Step S0 includes a step (S0-1) of joining a separator sheet (30) above and below the upper surface of a first electrode (10) (i.e., a sheet-shaped first electrode (10)) arranged in a row in multiple units using a lamination unit (220). Additionally, after step S0-1, a dotted line cutting unit (210) cuts a dotted line (L) into the first electrode half-cell sheet (H). c It includes the step (S0-2) of forming a ) on the first electrode sheet (E1) using a folding unit (230). Additionally, prior to step S0-1, a folding line (L) is formed on the first electrode sheet (E1) using a folding unit (230). b It may include a step of forming ).

[0116] Next, a step (S1) is performed in which a first electrode half-cell sheet (H) is extended in one direction and seated on the stack unit (110).

[0117] Next, step (S2) is performed in which a second electrode plate (20) provided from the other side of the stack unit (110) is placed on the first electrode half-cell sheet (H) of the stack unit (110). The second electrode plate (20) is provided from a second electrode supply unit (130) located on the other side of the stack unit (110), and the second electrode plate (20) is placed on the first electrode half-cell sheet (H) that was extended in one direction on the stack unit (110).

[0118] Next, step (S3) is performed in which a first electrode half-cell sheet (H) is placed on the stack unit (110) while extending in the other direction. At this time, the first electrode half-cell sheet (H) is placed while extending in the other direction and covering the second electrode plate (20) placed on the stack unit (110) in step S2. Additionally, the first electrode half-cell sheet (H) is folded on one side of the electrode assembly (1000).

[0119] Next, step (S4) is performed in which a second electrode plate (20) provided from one side of the stack unit (110) is placed on the first electrode half-cell sheet (H) of the stack unit (110). The second electrode plate (20) is provided from a second electrode supply unit (130) located on one side of the stack unit (110), and the second electrode plate (20) is placed on the first electrode half-cell sheet (H) that was extended in the other direction on the stack unit (110).

[0120] Next, step S1 is repeated. The first electrode half-cell sheet (H) is placed over the second electrode plate (20) placed on the stack unit (110) in step S4, extending in one direction. The first electrode half-cell sheet (H) is folded on the other side of the electrode assembly (1000).

[0121] In the manner described above, steps S1 to S4 are repeated in a plurality of cycles, and stacking of the electrode assembly (1000) is carried out on the stack unit (110). Accordingly, an electrode assembly (1000) as illustrated in FIG. 8 is manufactured. When the electrode assembly (1000) is completed, the first electrode half-cell sheet (H) is cut to separate the electrode assembly (1000) (S5).

[0122] The method for manufacturing an electrode assembly according to the embodiment of FIG. 11 can be performed in the electrode assembly manufacturing device (100) described above in FIG. 3, etc., and other details are redundant with those described above, so refer to the details therein.

[0123] According to the electrode assembly manufacturing apparatus and electrode assembly manufacturing method according to the embodiment of the present invention described in FIGS. 3 to 11, productivity can be significantly improved compared to the manufacturing apparatus and electrode assembly manufacturing method of a zigzag stacked electrode assembly that provided only one electrode plate at a time in the prior art.

[0124] FIG. 12 illustrates an electrode assembly manufacturing apparatus (400) according to another embodiment of the present invention.

[0125] Referring to FIG. 12, the electrode assembly manufacturing device (400) includes a stack unit (410), a separator guide unit (420), and a pair of electrode supply units (430). Here, the electrodes are a negative electrode (A) and a positive electrode (B), respectively. The electrodes are provided in the form of individual plate-shaped electrode plates (E).

[0126] First, the stack unit (410) is in the shape of a plate or table, and it is sufficient if the electrode assembly (2000, see FIG. 13) can be stacked on a flat upper surface, and it can be appropriately modified and changed to suit the environment in which the present invention is implemented. A separator sheet (S) and an electrode plate (E) are placed on the stack unit (410) to manufacture a zigzag stacked electrode assembly (2000).

[0127] A holding member (411) is additionally provided on the stack unit (410) to hold the separator sheet (S) and the electrode plate (E), thereby allowing the stacking of the electrode assembly (4000) to proceed. The holding member (411) may be, for example, a mandrel, but is not limited thereto and various modifications and changes are possible.

[0128] Additionally, the membrane guide unit (420) provides a membrane sheet (S) on the stack unit (410). For example, as shown in FIG. 13, the membrane guide unit (420) can alternately move between one side and the other side of the stack unit (410). Alternatively, although not illustrated in the present invention, in the opposite case, the stack unit (410) can alternately move between the other side and the one side with the membrane guide unit (420) in between while the membrane guide unit (420) is fixed in the middle.

[0129] The separator sheet (S) can be folded at one side and the other side of the stack unit (410), respectively, and stacked in a zigzag shape on the stack unit (410).

[0130] The separator guide unit (420) may be, for example, a pair of guide members (e.g., roller shape), but the present invention is not limited thereto, and it is sufficient as long as the separator sheet (S) can be drawn out and guided, and it can be appropriately modified and changed to suit the environment in which the present invention is implemented.

[0131] The separator sheet (S) has a dotted line cut line (L c Includes ). Dotted incision line (L c A separator sheet (S) containing ) can be wound into a roll shape and then unwound again in the electrode assembly manufacturing device (400) of FIG. 13 and provided onto a stack unit (410).

[0132] Alternatively, the electrode assembly manufacturing device (400) further includes a dotted line cutting unit (not shown) at the front end of the separator guide unit (420), and a dotted line-shaped incision line (L) at predetermined intervals on the separator sheet (S). c It could also be forming ).

[0133] A pair of electrode supply units (430) supply electrode plates (E) to a stack unit (410). For example, the pair of electrode supply units (430) may be positioned on each side of the stack unit (410), with the stack unit (410) in between. Each electrode supply unit (430) may have multiple electrode plates (E) loaded thereon, for example, in a magazine. Each electrode supply unit (430) positioned on both sides of the stack unit (410) alternately supplies electrode plates (E) one by one onto the stack unit (410).

[0134] An alignment unit (440) may be additionally provided between the stack unit (410) and the electrode supply unit (430). An electrode plate (E) picked up individually from the electrode supply unit (430) is placed on the alignment unit (440) and inspected for misalignment or defects of the electrode plate (E) using a vision unit (450, e.g., a camera). Afterward, the electrode plate (E) that is determined to be normal and correctly aligned can be picked up again from the alignment unit (440) and provided onto the stack unit (410).

[0135] Meanwhile, the embodiment of the electrode assembly manufacturing device (400) described above in FIG. 12 exemplarily illustrates a method of manufacturing a zigzag stacked electrode assembly (2000, see FIG. 13) according to the present invention. Accordingly, it should be noted that the electrode assembly manufacturing device (400) of the present invention is sufficient if it is capable of manufacturing the zigzag stacked electrode assembly (2000) of FIG. 13, and is not limited to what is described above in FIG. 12, but can manufacture the zigzag stacked electrode assembly (2000) in various other ways.

[0136] FIG. 13 illustrates an electrode assembly (2000) manufactured according to the embodiment described above in FIG. 12. Dotted cut lines (L) are made at predetermined intervals on a separator sheet (S). c ...including ) and the dotted line-shaped cut line (L) in the folding area (F) where the separator sheet (S) is folded alternately on one side and the other side of the electrode assembly (2000). c ) is located.

[0137] According to the electrode assembly (1000, 2000) described above, when the electrode assembly (1000, 2000) is immersed in an electrolyte, a dotted line-shaped incision (L c There is an advantage that the electrolyte can be more easily impregnated into the electrode assembly (1000, 2000) through ).

[0138] Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention. Explanation of the symbols

[0139] 10: First electrode 20: Second electrode plate 30: Separator sheet E: Electrode plate S: Separator sheet H: First electrode half-cell sheet E1: First electrode sheet E2: Second electrode sheet 100: Electrode assembly manufacturing device 110: Stack Unit 111: No holding 120: First electrode half-cell sheet guide unit 130: Second electrode supply unit 140: Alignment Unit 150: Vision Unit 200: Half-cell sheet manufacturing device 210: Dotted line cutting unit 211: Cutting knife 220: Lamination Unit 230: Bending unit 231: Bending knife 240: Drying unit 250: Vision Unit 260: Guide roller 300: Electrode plate cutting unit 400: Electrode assembly manufacturing device 410: Stack Unit 411: No holding 420: Separator guide unit 430: Electrode supply unit 440: Alignment Unit 450: Vision Unit L b : Fold line L c : Incision line F: Folding part

Claims

Claim 1 An electrode assembly comprising: a first electrode half-cell sheet folded in a zigzag pattern; and a second electrode plate interposed between the folded first electrode half-cell sheets, wherein the first electrode half-cell sheet has a separator sheet attached to the upper and lower surfaces of a sheet-shaped first electrode, and each of the folded regions of the first electrode half-cell sheet includes a dotted line-shaped cut line along the longitudinal direction of the electrode assembly, wherein the sheet-shaped first electrode and the separator sheet are penetrated together through the cut line, and the sheet-shaped first electrode and the second electrode plate have different polarities, and further including a fold line in which the sheet-shaped first electrode is pressed in each of the folded regions of the first electrode half-cell sheet, wherein the dotted line-shaped cut line of the first electrode half-cell sheet and the fold line of the sheet-shaped first electrode coincide with each other. Claim 2 An electrode assembly having a structure in which the second electrode plate is alternately provided on one side and the other side of the electrode assembly between the first electrode half-cell sheets of the folded electrode assembly. Claim 3 An electrode assembly according to claim 1, wherein, when viewed from one side of the electrode assembly, the separator sheet and the second electrode plate are alternately stacked, and each of the folded regions of the separator sheet includes the dotted line-shaped cut line. Claim 4 delete Claim 5 delete Claim 6 delete Claim 7 delete Claim 8 An electrode assembly manufacturing apparatus comprising: a first electrode half-cell sheet guide unit providing a first electrode half-cell sheet having a separator sheet attached to the upper and lower surfaces of a first electrode in the form of a sheet, respectively; a stack unit in which a second electrode plate is interposed between the folded first electrode half-cell sheets to stack an electrode assembly; and a pair of second electrode supply units disposed on both sides of the stack unit and alternately providing the second electrode plate, wherein each of the folded regions of the first electrode half-cell sheet includes a dotted line incision along the longitudinal direction of the electrode assembly, wherein the first electrode in the form of a sheet and the separator sheet are penetrated together through the incision line, and the first electrode in the form of a sheet and the second electrode plate have different polarities, and further including a fold line in which the first electrode in the form of a sheet is pressed in each of the folded regions of the first electrode half-cell sheet, and wherein the dotted line incision of the first electrode half-cell sheet and the fold line of the first electrode in the form of a sheet coincide with each other. Claim 9 An electrode assembly manufacturing apparatus according to claim 8, wherein each of the pair of second electrode supply units alternately provides the second electrode plate between the folded first electrode half-cell sheets on one side and the other side of the electrode assembly, respectively. Claim 10 An electrode assembly manufacturing apparatus according to claim 8, wherein the following steps are performed in sequence: (S1) a process in which the first electrode half-cell sheet is placed on the stack unit while extending in one direction; (S2) a process in which the second electrode plate provided from the other side of the stack unit is placed on the first electrode half-cell sheet of the stack unit; (S3) a process in which the first electrode half-cell sheet is placed on the stack unit while extending in the other direction; and (S4) a process in which the second electrode plate provided from one side of the stack unit is placed on the first electrode half-cell sheet of the stack unit. Claim 11 In item 10, the above processes (S1) to (S4) are repeated in a plurality of cycles, an electrode assembly manufacturing apparatus. Claim 12 An electrode assembly manufacturing apparatus according to claim 8, wherein, after the first electrode half-cell sheet is extended and seated in one direction on the stack unit, the second electrode plate is provided from a second electrode supply unit located on the other side of the stack unit and seated on the first electrode half-cell sheet on the stack unit, and after the first electrode half-cell sheet is extended and seated in the other direction, the second electrode plate is provided from a second electrode supply unit located on one side of the stack unit and seated on the first electrode half-cell sheet on the stack unit. Claim 13 An electrode assembly manufacturing apparatus according to claim 12, wherein when the first electrode half-cell sheet is extended in the other direction, the first electrode half-cell sheet is folded at one side of the electrode assembly and covers the second electrode plate, and when the first electrode half-cell sheet is extended in the one direction, the first electrode half-cell sheet is folded at the other side of the electrode assembly and covers the second electrode plate. Claim 14 An electrode assembly manufacturing apparatus according to claim 8, further comprising a dotted line cutting unit disposed at the front end of a first electrode half-cell sheet guide unit and forming the dotted line-shaped incision line at predetermined intervals on the first electrode half-cell sheet. Claim 15 An electrode assembly manufacturing apparatus according to claim 14, wherein the dotted line cutting unit comprises a plurality of cutting knives, and the plurality of cutting knives are arranged in a row along the width direction of the first electrode half-cell sheet and spaced apart by a predetermined distance between adjacent cutting knives. Claim 16 A first electrode half-cell sheet manufacturing apparatus comprising: a lamination unit for forming a first electrode half-cell sheet by combining a separator sheet on each of the upper and lower surfaces of a first electrode in the form of a sheet; and a dotted line cutting unit disposed at the rear end of the lamination unit and forming a dotted line incision line at a predetermined interval on the first electrode half-cell sheet, wherein the first electrode in the form of a sheet and the separator sheet are penetrated together at the incision line, and the first electrode half-cell sheet further comprises a fold line in which the first electrode in the form of a sheet is pressed in each of the folding regions, and wherein the dotted line incision line of the first electrode half-cell sheet and the fold line of the first electrode in the form of a sheet coincide with each other. Claim 17 A first electrode half-cell sheet manufacturing apparatus according to claim 16, wherein the dotted line cutting unit comprises a plurality of cutting knives, and the plurality of cutting knives are arranged in a line along a direction orthogonal to the direction of travel of the first electrode half-cell sheet and are spaced apart by a predetermined distance between adjacent cutting knives. Claim 18 A first electrode half-cell sheet manufacturing apparatus according to claim 16, further comprising a folding unit disposed at the front end of the lamination unit and forming the folding lines at predetermined intervals on the first electrode in the form of a sheet. Claim 19 In claim 18, the bending unit comprises a bending knife forming the bending line, and the bending knife is arranged in the width direction of the first electrode in the form of a sheet, a first electrode half-cell sheet manufacturing apparatus. Claim 20 delete Claim 21 delete Claim 22 delete Claim 23 delete Claim 24 delete Claim 25 A method for manufacturing an electrode assembly according to claim 1, comprising: (S1) a step of mounting the first electrode half-cell sheet on a stack unit while extending in one direction; (S2) a step of mounting the second electrode plate provided from the other side of the stack unit on the first electrode half-cell sheet of the stack unit; (S3) a step of mounting the first electrode half-cell sheet on the stack unit while extending in the other direction; and (S4) a step of mounting the second electrode plate provided from one side of the stack unit on the first electrode half-cell sheet of the stack unit, and further comprising a step of forming a fold line in which the sheet-shaped first electrode is pressed in each of the folding regions of the first electrode half-cell sheet and a dotted line-shaped incision line penetrating the sheet-shaped first electrode and the separator sheet together, wherein the dotted line-shaped incision line of the first electrode half-cell sheet and the fold line of the sheet-shaped first electrode coincide with each other. Claim 26 A method for manufacturing an electrode assembly according to claim 25, wherein steps (S1) to (S4) are repeated in a plurality of cycles.

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