Electrode assembly and method for manufacturing the same

Abstract

To provide an electrode assembly in which a process of additionally attaching a fixing tape after completion of stacking of electrode assemblies can be eliminated.SOLUTION: An electrode assembly is provided in which a negative electrode 3 and a positive electrode 1 are repeatedly stacked with a separator 2 sandwiched therebetween, the electrode assembly including a film disposed to cover one of side surfaces of the stacking of the negative electrode, the separator, and the positive electrode, the film being bonded with an adhesive to the side surface, upper and lower surfaces of the ends of the separator being bonded to each other to form a bonding portion 1a so that the folding or wrinkling of the separator is prevented, the ends of the separator making the bonding portion being bent toward each other and bonded.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0154664, filed on November 27, 2019, and all the contents disclosed in the literature of the Korean patent application are included as part of this specification.

[0002] The present invention relates to an electrode assembly and a method for manufacturing the same, and more particularly, to a method for manufacturing an electrode assembly capable of solving problems occurring during attachment of a conventional fixing tape by removing the fixing tape, and an electrode assembly that can be manufactured by the manufacturing method.

Background Art

[0003] Batteries for storing electrical energy can generally be classified into primary batteries and secondary batteries. A primary battery is a disposable consumable battery, while a secondary battery is a rechargeable battery manufactured using a material in which the oxidation and reduction processes between current and substances can be repeated. That is, when a reduction reaction is performed on the material by current, the power source is charged, and when an oxidation reaction is performed on the material, the power source is discharged, and such charging and discharging can be repeated.

[0004] Among various types of secondary batteries, a lithium secondary battery is usually manufactured by attaching a laminated electrode assembly of a cathode, a separator, and an anode to a case, and a process in which lithium ions are inserted (intercalated) and desorbed (deintercalated) from the lithium metal oxide of the cathode to the anode is repeated, and charging and discharging of the lithium secondary battery are performed.

[0005] In the electrode assembly, unit cells laminated with a negative electrode, a separator, and a positive electrode in a predetermined order are laminated in a determined quantity, or the positive electrode, the separator, and the negative electrode are repeatedly laminated one by one to form one electrode assembly. And such an electrode assembly is housed in a case such as a cylindrical can or a rectangular pouch and manufactured as a secondary battery.

[0006] On the other hand, known methods for manufacturing the electrode assembly include a winding type in which a separation membrane is laminated between the negative electrode and the positive electrode before winding; a laminated type in which the negative electrode and positive electrode are cut to have the required width and length, and then the negative electrode, separation membrane, and positive electrode are laminated in a repeating manner; and a stack-and-folding type in which unit cells are placed side by side on a folding separation membrane and then folded from one side.

[0007] In this case, the laminated electrode assembly is manufactured by stacking a predetermined number of positive electrodes 2, separator membranes 1, and negative electrodes 3, as shown in Figure 1a, which simplifies the conventional manufacturing process. These units are then stacked in predetermined numbers to produce an electrode assembly 100. For reference, in the electrode assembly shown in Figure 1a, multiple monocells are manufactured as unit cells 10, with the separator membrane / positive electrode / separator / negative electrode stacked from bottom to top. However, in this case, a half-cell 20, with the separator membrane / electrode (negative or positive electrode) / separator stacked in that order, is placed on top, with the separator membrane 1 on the top layer.

[0008] Then, when a predetermined number of the unit cells 10 are stacked, the fixing tape 200 is attached around the electrode assembly 100 (or so that its sides are attached to the top and bottom surfaces) to fix the electrode assembly 100 in place, thereby binding the unit cells 10 together.

[0009] However, in this structure, which involves binding the electrodes via fixing tape 200, a problem sometimes arises where the edges of the separation membrane 1 fold or lift due to the pressure applied when the fixing tape 200 is applied, as illustrated in Figure 1b, which shows how folding and lifting of the separation membrane occurs compared to the conventional electrode assembly structure.

[0010] This folding and lifting of the separator membrane 1 could potentially induce contact between the negative electrode 3 and the positive electrode 2, potentially causing a short circuit. [Overview of the project] [Problems that the invention aims to solve]

[0011] Therefore, the main object of the present invention is to provide an electrode assembly and a method for manufacturing the same that eliminate the process of additionally bonding fixing tape after the lamination of the electrode assembly is completed, so as to solve the problems described above. [Means for solving the problem]

[0012] To achieve the above-mentioned objectives, the present invention provides an electrode assembly comprising a negative electrode, a separator membrane, and a positive electrode repeatedly laminated, and including a film disposed to cover any one of the sides formed by the lamination of the negative electrode, separator membrane, and positive electrode; wherein the film is bonded to the side formed by the lamination of the negative electrode, separator membrane, and positive electrode with an adhesive.

[0013] The film is positioned on two opposing sides of the surface formed by the lamination of the negative electrode, separation membrane, and positive electrode.

[0014] The adhesive may be selected from one of the following: a fluid resin, a thermosetting adhesive, or a UV-curing resin.

[0015] Here, the film is formed to be longer than the height of the side surface formed by the lamination of the negative electrode, separation membrane, and positive electrode, and both ends of the film may have a structure in which they are folded so as to extend from the side surface and adhere to the bottom and top layers of the laminate formed by the lamination of the negative electrode, separation membrane, and positive electrode.

[0016] Furthermore, the present invention additionally provides a manufacturing method for producing an electrode assembly having the above-described configuration.

[0017] The present invention relates to a method for manufacturing an electrode assembly in which a negative electrode, a separation membrane, and a positive electrode are repeatedly stacked, and comprises a unit cell manufacturing step (S10) for manufacturing a unit cell having a predetermined stacked structure of a negative electrode, a separation membrane, and a positive electrode; a film insertion step (S20) for inserting a film into a mold; a unit cell stacking step (S30) for stacking the unit cells in the mold; and an adhesive application step (S40) for applying an adhesive between the unit cells stacked in the mold and the film, wherein the unit cell stacking step (S30) and the adhesive application step (S40) are repeated after the film insertion step (S20) until the stacking of predetermined unit cells is completed.

[0018] In the unit cell manufacturing step (S10), unit cells are manufactured such that the ends of the separation membranes are joined together to form a joint, and in the adhesive application step (S40), adhesive is applied so as to be injected between the joints of unit cells that are placed adjacent to each other vertically.

[0019] In the unit cell manufacturing step (S10), a unit cell is manufactured using monocells stacked in the order of separation membrane / negative electrode / separation membrane / positive electrode from bottom to top, or monocells stacked in the order of separation membrane / positive electrode / separation membrane / negative electrode. In addition, half-cells stacked in the order of separation membrane / negative electrode / separation membrane from bottom to top, or half-cells stacked in the order of separation membrane / positive electrode / separation membrane are manufactured separately as unit cells from the monocells. During the repeated unit cell stacking step (S30), stacking is performed using monocells, but when the unit cell stacking step (S30) is performed for the last time, stacking is performed using half-cells.

[0020] The adhesive applied in the adhesive application step (S40) may be one of the following selected from a fluid resin, a thermosetting adhesive, or a UV-curing resin.

[0021] If the adhesive is a thermosetting adhesive, the process further includes a heating step (S41) in which heat is applied to the mold to cure the thermosetting adhesive.

[0022] Furthermore, when the adhesive is a UV-curable resin agent, it further includes a UV irradiation step (S42) of irradiating ultraviolet rays through the film to the portion where the adhesive is applied.

[0023] On the other hand, when inserting the film into the mold in the film insertion step (S20), the lower end of the film may be inserted in a folded state so as to be laminated below the lowermost surface of the unit cell when the first unit cell is laminated. Further, when the lamination of the last unit cell is completed, it may further include a folding step (S50) of folding the upper end of the film so as to be laminated above the uppermost surface of the uppermost unit cell.

Advantages of the Invention

[0024] The electrode assembly of the present invention having the above technical features has a film attached to the side surface of the electrode assembly instead of the fixing tape (since the pressure generated when adhering the fixing tape is removed), so that folding or lifting of the separation film generated from the conventional structure can be prevented.

[0025] In the present invention, since the adhesion to the film is performed separately for each unit cell, the adhesion between the unit cell and the film can be performed more stably without applying pressure. In particular, since the unit cell has a joint formed at the end and the movement of each individual unit cell is fixed, the alignment of the entire electrode assembly can also be improved.

[0026] Furthermore, in the present invention, the upper end and the lower end of the film are folded so as to cover the uppermost layer and the lowermost layer of the electrode assembly, and it is possible to prevent the film from flowing down before the adhesive is cured.

Brief Description of the Drawings

[0027] [Figure 1a] It is a drawing in which the manufacturing process of the conventional electrode assembly is simplified and illustrated. [Figure 1b] It is a drawing in which the state of occurrence of the folding and lifting phenomena of the separation film in the structure of the conventional electrode assembly is illustrated. [Figure 2] This is a sequence diagram of the manufacturing method for the electrode assembly of the present invention. [Figure 3] This diagram illustrates the process by which a negative electrode, a separation membrane, and a positive electrode are stacked during the unit cell manufacturing stage to produce a unit cell. [Figure 4a] This diagram illustrates the cross-sectional state of a mold (a) and the state in which a film is attached to the inside of the mold (b) in a method for manufacturing an electrode assembly of the present invention. [Figure 4b] Figure 4a is a drawing that further illustrates the following states within the mold shown in Figure 4a: (c) the state in which unit cells are fixed between the films, (d) the state in which a glue gun applies adhesive between the fixed unit cells and the film, and (e) the state in which more unit cells are subsequently fixed and adhesive is applied between the fixed unit cells and the film by a glue gun. [Figure 4c] Figure 4b is a diagram that further illustrates the state in which the uppermost layer unit cell has been fixed in place within the mold shown in Figure 4b, the upper end of the film has been folded (f), and the state in which UV light is irradiated into the inside of the mold to cure the applied adhesive (g). [Figure 5] These drawings show a plan view, a front view, and a left side view of an electrode assembly manufactured by the electrode assembly manufacturing method of the present invention. [Modes for carrying out the invention]

[0028] The present invention will be described below in detail, based on the attached drawings, so that it can be easily implemented by a person with ordinary skill in the art to which the invention pertains. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0029] To clearly explain the present invention, irrelevant parts have been omitted, and the same or similar reference numerals are used throughout the specification for identical or similar components.

[0030] Furthermore, the terms and words used in this specification and the claims shall not be interpreted in a manner limited to their ordinary and lexicographical meanings, but rather in a manner consistent with the technical idea of ​​the present invention, in accordance with the principle that inventors themselves may appropriately define the concepts of terms in order to best describe their invention.

[0031] The present invention relates to an electrode assembly in which a negative electrode 3, a separation membrane 1, and a positive electrode 2 are repeatedly stacked, and to a method for manufacturing the same. Embodiments of the present invention will be described in more detail below with reference to the attached drawings.

[0032] First Embodiment The present invention provides a method for manufacturing an electrode assembly as a first embodiment. As shown in Figure 2, which illustrates the sequence of steps for manufacturing an electrode assembly according to the present invention, the manufacturing method according to this embodiment includes a unit cell manufacturing step (S10), a film insertion step (S20), a unit cell lamination step (S30), an adhesive application step (S40), and a film folding step (S50).

[0033] In the unit cell manufacturing step (S10), a unit cell 10 having a predetermined stacked structure of a negative electrode 3, a separation membrane 1, and a positive electrode 2 is manufactured, but the ends of the separation membrane 1 are joined together to form a joint portion 1a.

[0034] Specifically, as shown in Figure 3, which illustrates how a negative electrode 3, a separation membrane 1, and a positive electrode 2 are stacked to produce a unit cell 10, monocells and half-cells having predetermined stacked structures are manufactured as unit cells 10. The monocell may have a structure in which the layers are stacked from bottom to top in the order of separation membrane 1 / positive electrode 2 / separation membrane 1 / negative electrode 3, as shown in the figure, or in the order of separation membrane 1 / negative electrode 3 / separation membrane 1 / positive electrode 2. In addition, half-cells are provided from the monocell by removing the uppermost electrode (positive or negative electrode). The half-cell may have a structure in which the layers are stacked from bottom to top in the order of separation membrane 1 / negative electrode 3 / separation membrane 1, or in the order of separation membrane 1 / positive electrode 2 / separation membrane 1, such that the separation membrane 1 is placed on top after the stacking of the monocells is complete. Therefore, since the stacking of half-cells is performed after the stacking of monocells is completed, the electrode assembly stacked according to the present invention has a structure in which the separation membrane 1 is placed in the bottom layer and the top layer.

[0035] On the other hand, the unit cells 10 manufactured using the monocell and halfcell methods have a separation membrane 1 with a larger area than the positive electrode 2 and the negative electrode 3, and have a structure with protruding ends on both sides, as shown in the figure. In this unit cell manufacturing stage (S10), the ends of the separation membrane 1 are joined together at their upper and lower surfaces to form a joint 1a. The joint 1a does not necessarily have to be formed at any of the protruding ends of the separation membrane 1, but it is preferable to form it at the end that faces the film 30 when the unit cells 10 are stacked.

[0036] Figures 4a to 4c illustrate the cross-sectional state of the formwork (a), the state in which the film is attached to the inside of the formwork (b), the state in which unit cells are fixed between the film (c), the state in which a glue gun applies adhesive between the fixed unit cells and the film (d), and the state in which unit cells are further fixed and a glue gun applies adhesive between the fixed unit cells and the film (e).

[0037] Referring to Figures 4a to 4c, in the film insertion step (S20), the film 30 is placed on the inner surfaces of both sides facing each other within the mold M. The mold M is manufactured to a size that allows for the lamination of unit cells 10 between the film 30 while it is in place, and has sufficient strength.

[0038] The formwork M may be configured such that the internal space in which the unit cells 10 are stacked is hexahedral in shape. However, to prevent interference when a gripper (not shown) or the like that transports and stacks the unit cells 10 during stacking, one or both sides on which the film 30 is not placed may be left open.

[0039] Furthermore, the film 30 may be temporarily fixed to the inner surface of the mold M so as to maintain a vertically upright position before adhesive A is applied between the film 30 and the unit cell 10. That is, the mold M may be equipped with clips, holders, etc., for temporarily fixing the film 30, or the film 30 may be placed in the mold M with a weak adhesive applied to its surface before being placed inside the mold M. Other known methods may be used to temporarily fix the film 30, provided that the film 30 can be easily separated from the inner surface of the mold M after the manufacture of the electrode assembly is completed.

[0040] Furthermore, the mold M may have a structure in which a glue gun G can slide within the mold M, or a slit (not shown) that allows the glue gun G to enter vertically, so that the glue gun G can enter when adhesive A is applied between the film 30 and the unit cell 10.

[0041] On the other hand, when inserting the film 30 into the mold M during the film insertion step (S20), it is preferable that the lower end of the film 30 is folded so that it is laminated below the bottommost surface of the unit cell 10 when the first unit cell is laminated. The folded portion of the film 30 is provided to prevent it from flowing out of the mold M after the adhesive A has been applied but before it has hardened, and the length of the folded portion may be determined by the amount and condition of the adhesive A.

[0042] With the film 30 placed in the mold M and the glue gun G ready for operation, the unit cell lamination stage (S30) is then performed. In the unit cell lamination stage (S30), unit cells 10 are laminated in the mold M at the positive position between the two films 30. Here, the unit cells 10 are monocells as described above, but they are laminated so that the separation film 1 is placed below them.

[0043] Then, an adhesive application step (S40) is performed in which adhesive A is applied between the unit cells 10 and the film 30 that are stacked within the mold M.

[0044] In this embodiment, two films 30 are inserted so as to abut each other against opposing side walls within the formwork M, and the adhesive A is applied simultaneously to each of the side walls of the formwork M.

[0045] After the film insertion step (S20), the unit cell stacking step (S30) and the adhesive application step (S40) are repeated until the stacking of predetermined unit cells 10 is completed. Here, in the film insertion step (S20), half cells are stacked instead of mono cells for the stacking of unit cells 10 placed in the uppermost layer. Once the adhesive application of the half cells is completed (when the stacking of the last unit cell is completed), the upper end of the film 30 is folded in a folding step (S50) so that it is stacked on the uppermost surface of the uppermost unit cell 10. The folded upper end of the film 30 is in close contact with the separation film 1 placed in the uppermost layer by the uppermost unit cell 10.

[0046] On the other hand, the adhesive A used in this embodiment is non-conductive to prevent short circuits, but its type is not limited. Therefore, when the folding stage (S50) is completed, the adhesive A injected between the joints 1a of the vertically adjacent unit cells 10 may not fully harden depending on its type.

[0047] In other words, the adhesive A applied in this embodiment may be any one selected from a fluid resin, a thermosetting adhesive, or a UV-curing resin.

[0048] The present invention further provides an additional step for curing the adhesive A so that the electrode assembly can be removed from the mold M once the adhesion of the film 30 is complete.

[0049] For example, if the adhesive A is a thermosetting adhesive, the procedure may further include a heating step (S41) in which heat is applied to the mold M to cure the thermosetting adhesive.

[0050] On the other hand, if the adhesive A is a UV-curing resin agent, the process may further include a UV irradiation step (S42) in which ultraviolet light is irradiated through the film 30 to the portion to which the adhesive has been applied. The film 30 can also be made of any non-conductive material, but it may be made of a polymer material such as PET (polyethylene terephthalate) that has good adhesive strength and good chemical resistance.

[0051] For reference, in the adhesive application stage (S40), the glue gun G may have a heating function to improve the fluidity of the adhesive, and the heating temperature and spray pressure may be varied according to the thickness and material of the film 30, or the relative position and size of the joint 1a. Here, as described above, the mold M is configured so that the end of the glue gun G enters into it or the glue gun G is built into it, and the heating stage (S41) or UV irradiation stage (S42) is performed with the glue gun G laminated in the mold, so the adhesion of the film 30 is performed inside the mold M.

[0052] Furthermore, the formwork M may be made of a material capable of conducting heat, or it may have a structure that allows ultraviolet (UV) light to be irradiated into the interior, depending on whether or not the heating stage (S41) is carried out, or whether or not the UV irradiation stage (S42) is carried out.

[0053] Second Embodiment The present invention provides, as a second embodiment, an electrode assembly that can be manufactured by the manufacturing method according to the first embodiment.

[0054] The electrode assembly provided in this embodiment is an electrode assembly in which a negative electrode 3, a separator membrane 1, and a positive electrode 2 are repeatedly laminated, and includes a film 30 that is arranged to cover any one of the sides formed by the lamination of the negative electrode 3, the separator membrane 1, and the positive electrode 2, wherein the film 30 is bonded to the side formed by the lamination of the negative electrode 3, the separator membrane 1, and the positive electrode 2 with adhesive A.

[0055] Specifically, referring to Figure 5, which shows a plan view, front view, and left side view of an electrode assembly manufactured by the method for manufacturing an electrode assembly of the present invention, the negative electrode 3 and positive electrode 2 according to the present invention each have a negative electrode tab 3a and a positive electrode tab 2a protruding from one side. The positive electrode tab 2a and the negative electrode tab 3a are configured to protrude from opposite sides, and the film 30 is attached to each of the sides of the electrode assembly that include two sides that are perpendicular to the sides from which the positive electrode tab 2a and the negative electrode tab 3a protrude. Here, the upper end 30a of the film 30 is folded so as to cover the top layer surface of the laminated portion of the negative electrode 3, positive electrode 2, and separation membrane 1, and the lower end 30b of the film 30 is folded so as to cover the bottom layer surface of the laminated portion of the negative electrode 3, positive electrode 2, and separation membrane 1.

[0056] The electrode assembly of the present invention, having the technical features described above, has a film 30 attached to the side of the electrode assembly instead of fixing tape (because the pressure generated when the fixing tape is bonded is removed), thus preventing the folding or lifting of the separation membrane that occurred in conventional structures.

[0057] In this invention, since each unit cell 10 is bonded to the film 30 separately, the bond between the unit cell 10 and the film 30 can be more stable even without the application of pressure. In particular, since a joint portion 1a is formed at the end of each unit cell 10, and the movement of each individual unit cell 10 is fixed, the alignment of the entire electrode assembly can also be improved.

[0058] Furthermore, in this invention, the upper and lower ends of the film 30 are folded so as to cover the uppermost and lowermost layers of the electrode assembly, preventing it from flowing down before the adhesive A has cured.

[0059] Although the present invention has been described above, even with limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible by persons with ordinary skill in the art to which the present invention pertains, within the equivalent scope of the technical concept of the present invention and the claims described below. The following items will also be disclosed. [Item 1] An electrode assembly in which a negative electrode, a separator membrane, and a positive electrode are repeatedly stacked, The negative electrode, the separation membrane, and a film disposed to cover any one of the sides of the laminate of the positive electrode are included. The aforementioned film is an electrode assembly bonded to the side surface with an adhesive. [Item 2] The electrode assembly described in item 1 is provided, wherein the film is positioned at two mutually opposing sides of the aforementioned side. [Item 3] The electrode assembly according to item 1 or 2, wherein the adhesive is selected from one of the following: a fluid resin, a thermosetting adhesive, or a UV-curing resin. [Item 4] The electrode assembly according to any one of items 1 to 3, wherein the film is formed to be longer than the height of the side surface, and both ends of the film are folded so as to extend from the side surface and adhere to the bottom and top layers of the laminate. [Item 5] A method for manufacturing an electrode assembly in which a negative electrode, a separation membrane, and a positive electrode are repeatedly stacked, A unit cell manufacturing step involves manufacturing a unit cell having a predetermined stacked structure of a negative electrode, a separation membrane, and a positive electrode, The film insertion stage involves inserting the film into the formwork, A unit cell stacking step in which the unit cells are stacked within the mold, The process includes an adhesive application step of applying adhesive between the unit cells and the film that are stacked within the mold, A method for manufacturing an electrode assembly, wherein, after the film insertion step, the unit cell lamination step and the adhesive application step are repeated until the lamination of predetermined unit cells is completed. [Item 6] In the unit cell manufacturing step, the unit cell is manufactured such that the ends of the separation membrane are joined together to form a joint. The method for manufacturing an electrode assembly according to item 5, wherein in the adhesive application step, the adhesive is applied so as to be injected between the joints of each unit cell that are placed adjacent to each other vertically. [Item 7] The method for manufacturing an electrode assembly according to item 6, wherein in the unit cell manufacturing step, a unit cell is manufactured using a monocell stacked in the order of separation membrane / negative electrode / separation membrane / positive electrode from bottom to top, or a monocell stacked in the order of separation membrane / positive electrode / separation membrane / negative electrode. [Item 8] In the unit cell manufacturing step, half cells stacked in the order of separation membrane / negative electrode / separation membrane from bottom to top, or half cells stacked in the order of separation membrane / positive electrode / separation membrane, are manufactured separately from the monocell as unit cells. The method for manufacturing an electrode assembly according to item 7, wherein stacking is performed with monocells while the unit cell stacking step is repeated, but when the unit cell stacking step is performed for the last time, stacking is performed with halfcells. [Item 9] A method for manufacturing an electrode assembly according to any one of items 5 to 8, wherein the adhesive applied in the adhesive application step is selected from one of a fluid resin, a thermosetting adhesive, or a UV-curing resin. [Item 10] The adhesive applied in the aforementioned adhesive application step is a thermosetting adhesive. The method for manufacturing an electrode assembly according to item 9, further comprising a heating step of applying heat to the mold to cure a thermosetting adhesive. [Item 11] The adhesive applied in the aforementioned adhesive application step is a UV-curing resin agent. The method for manufacturing an electrode assembly according to item 9, further comprising a UV irradiation step of irradiating ultraviolet light through the film to the portion to which the adhesive is applied. [Item 12] A method for manufacturing an electrode assembly according to any one of items 5 to 11, wherein, in the film insertion step, when the film is inserted into the mold, the lower end of the film is inserted in a folded state so that it is stacked below the lowest layer surface of the unit cell when the first unit cell is stacked. [Item 13] A method for manufacturing an electrode assembly according to item 12, further comprising a folding step in which, when the stacking of the last unit cell is complete, the upper end of the film is folded so as to be stacked on top of the uppermost surface of the uppermost unit cell.

Claims

1. An electrode assembly in which a negative electrode and a positive electrode are repeatedly stacked with a separation membrane in between, The negative electrode, the separation membrane, and a film disposed to cover any one of the sides of the laminate of the positive electrode are included. The film is bonded to the side surface by an adhesive that is discontinuously applied along the stacking direction of the negative electrode, separation film, and positive electrode. The ends of the separation membrane are joined together by their upper and lower surfaces, forming a joint. The folding or lifting of the separation membrane is prevented. The ends of the separation membrane constituting the joint are joined together in an electrode assembly that curves toward each other.

2. The electrode assembly according to claim 1, wherein the film is arranged at two locations on the sides of the side that are opposite to each other.

3. The electrode assembly according to claim 1 or 2, wherein the adhesive is one selected from a thermosetting adhesive and a UV-curing resin.

4. The electrode assembly according to any one of claims 1 to 3, wherein the film is formed to be longer than the height of the side surface, and both ends of the film are folded so as to extend from the side surface and adhere to the bottom and top layers of the laminate.

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