Method for manufacturing electrode assembly having improved processing performance and electrode assembly manufactured using the same

Abstract

A method of manufacturing an electrode assembly according to an embodiment of the present disclosure includes: spreading a positive electrode sheet, a separator sheet, and a negative electrode sheet from a plurality of roller members, respectively; forming a laminate while passing the expanded positive electrode sheet, separator sheet, and negative electrode sheet between the pair of guide rollers; and punching a laminated body including a positive electrode sheet, a separator sheet, and a negative electrode sheet, in which each of the positive electrode sheet and the negative electrode sheet is alternately coated with an active material and a non-conductive material with reference to a traveling direction of the guide roller, and in which the step of punching the laminated body punches a portion coated with the non-conductive material.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Korean Patent Application No. 10-2022-0135189 filed in the Korean Intellectual Property Office on October 19, 2022, the disclosure of which is incorporated herein by reference in its entirety.

[0003] The present disclosure relates to a method of manufacturing an electrode assembly and an electrode assembly manufactured using the method, and more particularly, to a method of manufacturing an electrode assembly having improved processability and an electrode assembly manufactured using the method. Background Art

[0004] As technology develops and demand for mobile devices increases, demand for secondary batteries as energy sources is rapidly increasing. In particular, secondary batteries have attracted a lot of attention not only as energy sources for electric drive devices such as electric bicycles, electric vehicles, and hybrid electric vehicles, but also as energy sources for mobile devices such as mobile phones, digital cameras, laptops, and wearable devices.

[0005] Research on lithium secondary batteries having high energy density and discharge voltage is actively being conducted, and some commercialization stages are also underway.

[0006] This lithium secondary battery is manufactured by loading an electrode assembly into a battery case together with an electrolyte, wherein the positive electrode and the negative electrode are manufactured by coating a positive electrode or a negative electrode active material, a binder, and a conductive material on a current collector in the form of a slurry and drying them to form an electrode mixed layer, a separator is inserted between the positive electrode and the negative electrode, and then they are laminated to obtain the electrode assembly.

[0007] As an electrode assembly with an advanced structure of a combination of a jelly roll type and a stacked type, a stacked / folded type electrode assembly has been developed, which is configured as a structure in which a full cell having a positive electrode / separator / negative electrode structure with a specific unit size is folded using a long continuous isolation membrane, or a bi-cell having a positive electrode (negative electrode) / separator / negative electrode (positive electrode) / separator / positive electrode (negative electrode) structure.

[0008] Furthermore, in order to improve the processing performance of conventional stacked type electrode assemblies and meet the demands for various secondary batteries, laminated / stacked type electrode assemblies configured to have a structure in which unit cells in which electrodes and separators are alternately laminated and joined are stacked have also been developed.

[0009] When manufacturing a stacked electrode assembly, a lamination method is generally used in which the positive electrode, the separator, and the negative electrode are produced in separate processes, and then the positive electrode, the separator, and the negative electrode are laminated and joined by applying heat and pressure at the same time. At this time, before joining the electrode and the separator by the lamination method, a punching process may be performed to realize the shape of the electrode assembly. In the punching process, the positive electrode and the negative electrode are punched separately, and then the positive electrode and the negative electrode are laminated together with the separator by a lamination method to manufacture a stacked electrode assembly.

[0010] However, if a stacked type electrode assembly is manufactured by punching electrodes individually and then laminating them, there are problems in that the assembling process time becomes long and the cost increases.

[0011] In addition, in order to prevent the separator from shrinking due to heat in the electrode assembly and causing a short circuit due to contact between the positive electrode and the negative electrode, the separator may be cut in a larger amount than the positive electrode and the negative electrode during the punching process and then laminated, but if this is the case, the production unit cost increases because the separator is cut in a larger amount than required. Summary of the invention

[0012] Technical issues

[0013] An object of the present disclosure is to provide a method of manufacturing an electrode assembly which reduces the complexity of punching and laminating processes, thereby improving processability, and an electrode assembly manufactured by using the method.

[0014] Another object of the present disclosure is to provide a method of manufacturing an electrode assembly capable of preventing occurrence of a short circuit during a punching process, thereby improving product quality, and an electrode assembly manufactured by using the method.

[0015] Still another object of the present disclosure is to provide a method of manufacturing an electrode assembly which accurately sets a punching position during a process, thereby improving productivity, and an electrode assembly manufactured by using the method.

[0016] The objects of the present disclosure are not limited to the aforementioned objects, and other objects and advantages not mentioned herein will be clearly understood by those skilled in the art from the following description and the accompanying drawings.

[0017] Technical Solution

[0018] According to an embodiment of the present disclosure, there is provided a method for manufacturing an electrode assembly, the method comprising the following steps: unfolding a positive electrode sheet, a separator sheet and a negative electrode sheet from a plurality of roller members, respectively; forming a laminate while passing the unfolded positive electrode sheet, the separator sheet and the negative electrode sheet between a pair of guide rollers; and punching the laminate comprising the positive electrode sheet, the separator sheet and the negative electrode sheet, wherein each of the positive electrode sheet and the negative electrode sheet is alternately coated with an active material and a non-conductive material based on a travel direction of the guide roller, and wherein the step of punching the laminate punches a portion coated with the non-conductive material.

[0019] The step of punching the laminate may punch the positive electrode sheet, the separator sheet, and the negative electrode sheet at the same time.

[0020] The negative electrode sheet may be formed to include lithium metal.

[0021] A marking portion for guiding a punching position of the laminate may be formed in the portion coated with the non-conductive material.

[0022] The marking portion may be formed on the same line as a line on which the non-conductive material is coated during a process of coating the non-conductive material.

[0023] The non-conductive material may include a polymer material.

[0024] The polymer material used may be of the PE (polyethylene) series.

[0025] The step of alternately applying the active material and the non-conductive material to each of the positive electrode sheet and the negative electrode sheet may be performed before the step of unrolling the positive electrode sheet and the negative electrode sheet from the roller member.

[0026] The step of passing through the guide roller to form the laminate may be performed immediately after the step of respectively unrolling the positive electrode sheet, the separator sheet, and the negative electrode sheet from the plurality of roller members.

[0027] The step of punching the laminate uses a cutting member, wherein the non-conductive material is formed of a material having ductility to ensure that the electrode material does not adhere to the cutting member.

[0028] The cutting member may directly cut the positive electrode sheet, the separator sheet, and the negative electrode sheet.

[0029] A direction of punching the laminate may be perpendicular to a traveling direction of the guide roller.

[0030] According to another embodiment of the present disclosure, an electrode assembly is provided, wherein: a positive electrode, a separator and a negative electrode are layered in a preset direction, the positive electrode and the negative electrode each include an active material layer and a non-conductive layer located on both sides of the active material layer, and the non-conductive material includes a polymer material.

[0031] With reference to a direction perpendicular to a direction in which an electrode tab of the positive electrode or the negative electrode protrudes and perpendicular to the preset direction, each width of the positive electrode, the separator, and the negative electrode may be equal to each other.

[0032] Widths of a positive electrode active material layer and a negative electrode active material layer respectively included in the positive electrode and the negative electrode may be equal to each other with reference to a direction perpendicular to a direction in which the electrode tab protrudes.

[0033] Beneficial Effects

[0034] According to an embodiment, the positive electrode sheet / separator / negative electrode sheet are simultaneously unfolded and then punched simultaneously, thereby being able to reduce the complexity of the punching and laminating processes.

[0035] In addition, a non-conductive layer is formed at both ends of the positive electrode / negative electrode, thereby preventing a short circuit phenomenon at the side.

[0036] Furthermore, it is possible to prevent the cutting member from directly contacting the electrode material during the punching process so that the electrode material adhered to the cutting member contaminates the electrode having a different polarity.

[0037] Furthermore, the marking portion is formed on the non-conductive layer, thereby being able to accurately set the punching position during the process and improve the yield.

[0038] Effects obtained from the present disclosure are not limited to the above-mentioned effects, and additional other effects that are not mentioned will be clearly understood by those skilled in the art from the specification and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a view showing an electrode assembly manufacturing apparatus according to an embodiment of the present disclosure.

[0040] Figure 2 is a view for explaining a method of manufacturing an electrode assembly according to the present disclosure.

[0041] Figure 3 2 is a view for explaining a process of punching a laminate according to an embodiment of the present disclosure.

[0042] Figure 4 is along Figure 3 Cross-sectional view taken along the cutting line AA'.

[0043] Figure 5 It is shown in Figure 4 View of the formed unit cell after die cutting the laminate.

[0044] Figure 6 is a view showing a conventional method of manufacturing an electrode assembly. DETAILED DESCRIPTION

[0045] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. The present disclosure can be modified in various different ways and is not limited to the embodiments set forth herein.

[0046] In order to clearly describe the present disclosure, parts irrelevant to the description will be omitted, and the same reference numerals denote the same elements throughout the specification.

[0047] In addition, since the size and thickness of each element shown in the drawings are arbitrarily shown for the convenience of explanation, it is obvious that the present disclosure is not necessarily limited to those sizes and thicknesses shown in the drawings. In the drawings, the thickness is exaggerated in order to clearly show several layers and regions. In the drawings, the thickness of some layers and regions is exaggerated for the convenience of explanation.

[0048] In addition, throughout the application, when a part is referred to as “including” or “comprising” a certain component, it means that the part may further include other components, but does not exclude the other components, unless otherwise specified.

[0049] Furthermore, throughout the application, when referred to as a “plane”, it means when the target portion is viewed from the upper side, and when referred to as a “section”, it means when the target portion is viewed from one side of the section cut vertically.

[0050] Figure 1 is a view showing an electrode assembly manufacturing apparatus according to an embodiment of the present disclosure. Figure 2 is a view for explaining a method of manufacturing an electrode assembly according to the present disclosure. Figure 3 2 is a view for explaining a process of punching a laminate according to an embodiment of the present disclosure. Figure 4 is along Figure 3 Cross-sectional view taken along the cutting line AA'.

[0051] Reference Figure 1 According to the present embodiment, the electrode assembly manufacturing apparatus includes a plurality of roller members 100, 200 and 300, and includes a conveying member (not shown) for conveying sheets 110, 210 and 310 respectively unfolded from the plurality of roller members 100, 200 and 300; a pair of guide rollers 400 for guiding the plurality of sheets 110, 210 and 310; and a cutting member 500 for punching the plurality of sheets 110, 210 and 310.

[0052] The plurality of roller members 100, 200, and 300 include a first winding roller 100 for winding a positive electrode sheet 110, a second winding roller 200 for winding a separator sheet 210, and a third winding roller 300 for winding a negative electrode sheet 310. At this time, the positive electrode sheet 110 may be in a state of not being punched out, and may be wound on the first winding roller 100 in the form of a long sheet extending in one direction in a state where a positive electrode active material layer and a non-conductive layer are formed on a positive electrode collector described later. The separator sheet 210 may also be wound on the second winding roller 200 in a state of not being punched out. The negative electrode sheet 310 is also in a state of not being punched out, and may be wound on the third winding roller 300 in the form of a long sheet extending in one direction in a state where a negative electrode active material layer and a non-conductive layer are formed on a negative electrode collector described later.

[0053] The conveying member may be a conveyor belt unit, and may be used to convey the sheets 110 , 210 , and 310 in one direction (x-axis direction).

[0054] The guide roller 400 includes an upper guide roller 410 and a lower guide roller 420 disposed at an upper portion and a lower portion, respectively, and the sheets 110 , 210 , and 310 may pass between these rollers.

[0055] The cutting member 500 may be a punching knife that directly cuts the positive electrode sheet 110, the separator sheet 210, and the negative electrode sheet 310. The cutting member 500 may cut the sheets 110, 210, and 310 in a direction perpendicular to the first direction (x-axis direction) of the conveying sheets 110, 210, and 310.

[0056] Hereinafter, a method of manufacturing an electrode assembly using the electrode assembly manufacturing apparatus according to the present embodiment will be described.

[0057] The positive electrode sheet 110, the separator sheet 210, and the negative electrode sheet 310 are each unfolded from a plurality of roller members 100, 200, and 300 and conveyed along a first direction (x-axis direction), and then while unfolding, the positive electrode sheet 110, the separator sheet 210, and the negative electrode sheet 310 can be in close contact with each other in a direction perpendicular to the conveying direction (x-axis direction). In other words, the sheets 110, 210, and 310 can be unfolded from a plurality of roller members 100, 200, and 300 to be in a laminated state.

[0058] The unrolled positive electrode sheet 110, the separator sheet 210, and the negative electrode sheet 310 may form a laminate while passing between a pair of guide rollers 400. The sheets 110, 210, and 310 in the shape of a laminate may pass between an upper guide roller 410 and a lower guide roller 420 disposed at the upper and lower parts, respectively. Preferably, the step of passing through the guide roller 400 to form a laminate is performed immediately after the step of unrolling the positive electrode sheet 110, the separator sheet 210, and the negative electrode sheet 310 from the plurality of roller members 100, 200, and 300, respectively.

[0059] The laminate formed by passing between a pair of guide rollers 420 can still maintain a continuous sheet shape. In addition, the sheets 110, 210 and 310 that are unfolded to form a laminate state can pass between a pair of guide rollers 420 and further adhere to each other closely to form a laminate. Then, the sheets 110, 210 and 310 can be conveyed in a first direction (x-axis direction) and maintained in a laminated state. Then, a lamination process of applying heat and pressure can be performed so that the positive electrode sheet 110, the diaphragm sheet 210 and the negative electrode sheet 310 are bonded to each other.

[0060] Figure 2 Portions of the plurality of sheets 110 , 210 , and 310 that are punched by the cutting member 500 after passing through a pair of guide rollers 400 are schematically illustrated.

[0061] Reference Figure 1 and Figure 2 , the laminate including the positive electrode sheet 110, the separator sheet 210, and the negative electrode sheet 310 may be punched using the cutting member 500. At this time, the cutting member 500 may directly cut the positive electrode sheet 110, the separator sheet 210, and the negative electrode sheet 310.

[0062] On the positive electrode sheet 110, a coating portion on which an active material layer 111 is formed and an uncoated portion 112 on which an active material is not coated may be provided in a direction perpendicular to the traveling direction of the guide roller 400 (y-axis direction). The coating portion and the uncoated portion 112 may be arranged sequentially in the -y-axis direction. The active material layer 111 may be a positive electrode mixture layer including a positive electrode active material, a binder, and a conductive material. In one example, the active material layer 111 may be formed by coating and drying a positive electrode active material, a binder, and a conductive material in the form of a slurry on a current collector.

[0063] A coating portion on which an active material layer 311 is formed and an uncoated portion 312 on which an active material is not coated may be provided on the negative electrode sheet 310 in a direction perpendicular to the traveling direction of the guide roller 400 (y-axis direction). The coating portion and the uncoated portion 312 may be arranged sequentially in the y-axis direction. The active material layer 311 may be a negative electrode mixture layer including a negative electrode active material, a binder, and a conductive material. In one example, the active material layer 311 may be formed by coating and drying a negative electrode active material, a binder, and a conductive material in the form of a slurry on a current collector.

[0064] In other words, the uncoated portions 112 and 312 formed on the positive electrode sheet 110 and the negative electrode sheet 310, respectively, may be arranged in different directions from each other with the coating portion as a reference. At this time, the tab-shaped protrusions formed on the positive electrode sheet 110 and the negative electrode sheet 310, respectively, may be arranged in different directions from each other with the coating portion as a reference. Here, the tab-shaped protrusions may be used as electrode tabs. In other words, the uncoated portions 112 and 312 may be used as electrode tabs as they are, and as another example, the tab-shaped protrusions may have a shape that allows a separate electrode tab to be easily attached thereto.

[0065] Figure 3 It shows that when viewed along the z-axis direction, in the process of punching the laminate, the vertical direction ( Figure 1 The positive electrode sheet 110, the separator sheet 210 and the negative electrode sheet 310 which are overlapped in the z-axis direction (in FIG. 2 ) are separated on a plane.

[0066] Reference Figure 3 , when punching the laminate, each of the positive electrode sheet 110 and the negative electrode sheet 310 may be in a state of being alternately coated with active materials and non-conductive materials with respect to the traveling direction (x-axis direction) of the guide roller 400. The step of alternately coating the active materials and non-conductive materials on each of the positive electrode sheet 110 and the negative electrode sheet 310 may be performed before the step of unfolding the positive electrode sheet 110 and the negative electrode sheet 310 from the roller members 100 and 300. In the step of punching the laminate, the positive electrode sheet 110, the separator sheet 210, and the negative electrode sheet 310 may be punched at the same time. The direction of punching the laminate may be a direction perpendicular to the traveling direction of the guide roller 400 ( Figure 1 in the z-axis direction).

[0067] In this embodiment, since the positive electrode sheet 110, the separator sheet 210 and the negative electrode sheet 310 are punched out at the same time, the problem of long assembly process time and increased cost when manufacturing a stacked electrode assembly by punching out electrodes and separators separately and then laminating them as in the past can be solved.

[0068] When the sheets 110, 210, and 310 are punched out simultaneously in this manner, the electrode material may adhere to the cutting member 500. As the sheets 110, 210, and 310 advance, the laminate is punched out at a prescribed interval. However, if the laminate is cut in a state where the electrode material adheres to the cutting member 500, the electrode material may contact an electrode sheet having a polarity different from that of the electrode material adhered to the cutting member 500. If this is the case, the quality of the electrode may deteriorate, and ultimately the life of the battery may be shortened.

[0069] According to this embodiment, when punching the laminate, the electrode portion coated with the non-conductive material is punched. Figure 3 As shown, Figure 2 The cutting member 500 may cut the laminate along a punching position line 610 passing through the non-conductive layers 113 and 313 .

[0070] A marking portion 600 for guiding the punching position of the laminate may be formed in the portion coated with the non-conductive material. The marking portion 600 may be formed on the same line as the line on which the non-conductive material is coated during the process of coating the non-conductive material. In other words, Figure 3 As shown, preferably, the marking portion 600 is formed substantially on the same line as the punching position line 610 .

[0071] In one example, when the active material and the non-conductive material are coated, the non-conductive material coating device and the marking portion forming device may be linked to leave a mark at the center of the portion coated with the non-conductive material, thereby forming the marking portion 600 .

[0072] By forming the marking portion 600, the punching position of the cutting member 500 can be found more accurately during the automated process, so the effect of improving the yield can be expected. The marking portion 600 according to the present embodiment can not only perform the role of accurately finding the punching position, but also perform the role of aligning the positive electrode sheet 110, the diaphragm sheet 210 and the negative electrode sheet 310 when the positive electrode sheet 110, the diaphragm sheet 210 and the negative electrode sheet 310 are unfolded from the plurality of roller members 100, 200 and 300.

[0073] Reference Figure 4 The positive electrode sheet 110 may include an active material layer 111 and a non-conductive layer 113 formed on at least one surface of a positive electrode collector 115, and the negative electrode sheet 310 may include an active material layer 311 and a non-conductive layer 313 formed on at least one surface of a negative electrode collector 315. As described above, Figure 2The cutting member 500 cuts the laminate in the vertical direction (z-axis direction) along the punching position line 610 so that the non-conductive layer 113 of the positive electrode sheet 110, the separator sheet 210, and the non-conductive layer 313 of the negative electrode sheet 310 are punched at the same time. The left and right widths of the cutting member 500 may correspond to the interval between the punching position lines 610 adjacent to each other.

[0074] The non-conductive material forming the non-conductive layer 313 according to the present embodiment preferably includes a polymer material. In one example, the PE (polyethylene) series can be used as the polymer material, but is not limited thereto, and any polymer material with high ductility can be used. Preferably, the non-conductive material according to the present embodiment has greater ductility than ceramics and greater ductility than ordinary metal materials. The non-conductive material can have ductility similar to that of lithium metal having high ductility.

[0075] According to the present embodiment, the negative electrode sheet 310 is preferably formed of lithium metal. Carbon-based materials, silicon, lithium metal, etc. are used as negative electrode active materials in lithium-ion batteries, among which lithium metal has the advantage of being able to obtain the highest energy density. When a lithium metal battery is used in this way, due to the high reactivity of lithium metal, the volume expansion of the negative electrode during battery charging and discharging, and the surface unevenness that occurs during the process of lithium metal stripping and electrodeposition from the negative electrode, a stable interface is not formed between the electrolyte and the lithium metal electrode, and a continuous electrolyte decomposition reaction occurs. This electrolyte side reaction shortens the battery life and rapidly increases the battery resistance.

[0076] In order to reduce the above problems, when using lithium metal batteries, it is necessary to always apply strong pressure to the battery cell, and a spring or a strong compression member can be used to apply such pressure. In other words, if strong pressure is not applied during charging and discharging, the life of the battery will be reduced, so when using lithium metal batteries, strong pressure can be applied to the battery cell. However, according to the present embodiment, since the non-conductive layers 113 and 313 are formed using a polymer material with high ductility, the non-conductive layers 113 and 313 will not break even under strong pressure conditions, which will not cause damage to the current collectors 115 and 315. If the non-conductive layers 113 and 313 are made of a material with low ductility such as ceramics, they will break under strong pressure conditions.

[0077] Figure 5 is shown in the punching Figure 4 A view of a unit cell after lamination. Figure 6 is a view showing a conventional method of manufacturing an electrode assembly.

[0078] Reference Figure 5, the unit cell 700 according to the present embodiment can be formed by the method of manufacturing an electrode assembly as described above. The unit cell 700 includes a positive electrode 118, a separator 218, and a negative electrode 318 formed after punching out the laminate. At this time, the positive electrode 118 and the negative electrode 318 include active material layers 111 and 311 and non-conductive layers 113 and 313 located on both sides of the active material layers 111 and 311, respectively.

[0079] According to this embodiment, Figure 1 The widths of the positive electrode 118, the separator 218, and the negative electrode 318 are approximately equal to each other, based on the traveling direction (x-axis direction) of the guide roller 400 in the embodiment. This is because, in the method for manufacturing an electrode assembly according to the present embodiment, the positive electrode sheet, the separator, and the negative electrode sheet are punched out at the same time. At this time, the traveling direction (x-axis direction) of the guide roller 400 is perpendicular to Figure 5 The widths of the positive electrode 118, the separator 218 and the negative electrode 318 may be substantially equal to each other, based on the protruding direction of the electrode tab 116 (y-axis direction).

[0080] In addition, Figure 1 The widths of the positive electrode active material layer 111 and the negative electrode active material layer 311 respectively included in the positive electrode 118 and the negative electrode 318 may be equal to each other, with reference to the traveling direction (x-axis direction) of the guide roller 400 in FIG. Figure 6 Conventionally, in the case where the positive electrode 11 and the negative electrode 31 are punched out separately and then laminated, in order to prevent a short circuit phenomenon due to contact between the positive electrode and the negative electrode, the separator 21 is cut larger than the negative electrode 31 and the positive electrode 11 during the punching process. However, in the present embodiment, even if the widths of the positive electrode active material layer 111 and the negative electrode active material layer 311, which roughly correspond to the width of the electrodes, are equal to each other, since the non-conductive layers 113 and 313 are formed, a short circuit phenomenon can be prevented.

[0081] In the present embodiment, when punching is performed in a laminated state, a phenomenon in which at least one of the plurality of sheets is pushed may occur, but the non-conductive layers 113 and 313 can cover portions where the positive electrode 118 and the negative electrode 318 may contact each other, thereby preventing a short circuit phenomenon.

[0082] Refer again Figure 1 , formed after simultaneously punching out the positive electrode sheet 110, the separator sheet 210 and the negative electrode sheet 310 in a laminated state Figure 5The unit cells 700 may be transferred and laminated by a pick & place method to form an electrode assembly. As another example, the unit cells 700 formed by punching the laminate may be loaded and stored in a storage box such as a box. Thereafter, the unit cells 700 stored in the storage box may be transferred and laminated again by a pick & place method to form an electrode assembly.

[0083] Subsequently, a battery cell may be manufactured by housing an electrode assembly including at least one unit cell 700 together with an electrolyte in a battery case.

[0084] For ease of explanation, although the above description assumes that the three layers of negative electrode / separator / positive electrode are unfolded and operated simultaneously, when forming a laminate, electrodes of different polarities must be separated by a separator and insulated from each other so that one end of the basic unit forming the laminate can end with a separator. In one example, the four layers of positive electrode / separator / negative electrode / separator are used as the basic unit, or the six layers of positive electrode / separator / negative electrode / separator / positive electrode / separator or the six layers of negative electrode / separator / positive electrode / separator / negative electrode / separator can be used as the basic unit, and more layers can also be used as the basic unit and operated simultaneously.

[0085] Specifically, when the four layers of positive electrode / separator / negative electrode / separator are used as the basic unit, Figure 1 A winding roller for winding a separator sheet is arranged below the third winding roller 300 in the embodiment, and when unfolded together with the positive electrode sheet 110, the separator sheet 210 and the negative electrode sheet 310 and forming the laminate according to the above-mentioned present embodiment, one end of the basic unit can be set as a separator.

[0086] Although the present invention has been described in detail above with reference to the preferred embodiments of the present invention, those skilled in the art will understand that the scope of the present disclosure is not limited thereto, and that various modifications and improvements may be made in these embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0087] [Explanation of Reference Numbers]

[0088] 100, 200, 300: Roller components

[0089] 110: Positive electrode

[0090] 111, 311: Active material layer

[0091] 112, 312: Uncoated part

[0092] 113, 313: Non-conductive layer

[0093] 115, 315: Current collector

[0094] 118: Positive electrode

[0095] 210: Diaphragm

[0096] 218: Diaphragm

[0097] 310: Negative electrode

[0098] 318: Negative electrode

[0099] 400: Guide roller

[0100] 500: Cutting components

[0101] 600: Marking Department

[0102] 610: Punching position line.

Claims

1. A method for manufacturing an electrode assembly, the method comprising the following steps: Unrolling the positive electrode sheet, the separator sheet, and the negative electrode sheet from a plurality of roller members, respectively; forming a laminate while passing the unrolled positive electrode sheet, the separator sheet, and the negative electrode sheet between a pair of guide rollers; and punching the laminate including the positive electrode sheet, the separator sheet and the negative electrode sheet, wherein each of the positive electrode sheet and the negative electrode sheet is alternately coated with an active material and a non-conductive material based on the traveling direction of the guide roller, and The step of punching the laminate punches a portion coated with the non-conductive material.

2. The method for manufacturing an electrode assembly according to claim 1, wherein: The step of punching out the laminated body punches out the positive electrode sheet, the separator sheet, and the negative electrode sheet simultaneously.

3. The method for manufacturing an electrode assembly according to claim 1, wherein: The negative electrode sheet is formed to include lithium metal.

4. The method for manufacturing an electrode assembly according to claim 1, wherein: A marking portion for guiding a punching position of the laminate is formed in a portion coated with the non-conductive material.

5. The method for manufacturing an electrode assembly according to claim 4, wherein: The marking portion is formed on the same line as a line on which the non-conductive material is applied during a process of applying the non-conductive material.

6. The method for manufacturing an electrode assembly according to claim 1, wherein: The non-conductive material comprises a polymer material.

7. The method for manufacturing an electrode assembly according to claim 6, wherein: The polymer material used is PE (polyethylene) series.

8. The method for manufacturing an electrode assembly according to claim 1, wherein: The step of alternately applying the active material and the non-conductive material to each of the positive electrode sheet and the negative electrode sheet is performed before the step of unrolling the positive electrode sheet and the negative electrode sheet from the roller member.

9. The method for manufacturing an electrode assembly according to claim 1, wherein: The step of passing through the guide rollers to form the laminate is performed immediately after the step of respectively unrolling the positive electrode sheet, the separator sheet, and the negative electrode sheet from the plurality of roller members.

10. The method for manufacturing an electrode assembly according to claim 1, wherein: The step of punching the laminate uses a cutting member, wherein the non-conductive material is formed of a material having ductility to ensure that the electrode material does not adhere to the cutting member.

11. The method for manufacturing an electrode assembly according to claim 10, wherein: The cutting member directly cuts the positive electrode sheet, the separator sheet, and the negative electrode sheet.

12. The method for manufacturing an electrode assembly according to claim 10, wherein: The direction of punching the laminate is perpendicular to the traveling direction of the guide roller.

13. An electrode assembly, wherein: The positive electrode, separator and negative electrode are laminated in a preset direction. The positive electrode and the negative electrode each include an active material layer and a non-conductive layer located on both sides of the active material layer, and The non-conductive material comprises a polymer material.

14. The electrode assembly according to claim 13, wherein: With reference to a direction perpendicular to a direction in which an electrode tab of the positive electrode or the negative electrode protrudes and perpendicular to the preset direction, widths of each of the positive electrode, the separator, and the negative electrode are equal to each other.

15. The electrode assembly according to claim 14, wherein: With reference to a direction perpendicular to a direction in which the electrode tab protrudes, widths of a positive electrode active material layer and a negative electrode active material layer respectively included in the positive electrode and the negative electrode are equal to each other.

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