Electrode assembly sealing device and sealing method

Abstract

The electrode assembly sealing device according to an embodiment may include a pressure unit that applies pressure to a plurality of separators by including a pressure surface parallel to the corners where the electrode plates are cut, and a moving unit that moves the pressure unit toward the electrode assembly. With this configuration and structure, the electrode assembly sealing device according to an embodiment may minimize bending and cracking of electrodes that occur during a sealing process, and may perform a sealing process more precisely to improve process accuracy.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0027739 filed on March 3, 2022, and Korean Patent Application No. 10-2023-0028024 filed on March 2, 2023, and all contents disclosed in the documents of said Korean patent applications are incorporated herein by reference.

[0002] The present invention relates to an electrode assembly sealing device and method, and more particularly to a sealing device and method for sealing a plurality of separators included in an electrode assembly to each other. [Background technology]

[0003] Generally, types of secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries, and lithium-ion polymer batteries. These secondary batteries are used not only in small products such as digital cameras, DVD players, MP3 players, mobile phones, PDAs (registered trademarks), portable game devices, power tools, and e-bikes, but also in large products that require high output, such as electric vehicles and hybrid vehicles, as well as in power storage devices and backup power storage devices that store surplus generated power and new / renewable energy.

[0004] To manufacture such a secondary battery, first, an electrode active material slurry is applied to a positive electrode current collector and a negative electrode current collector to form a positive electrode and a negative electrode, which are then stacked on both sides of a separator to form an electrode assembly of a predetermined shape, and then the electrode assembly is placed in a battery case, an electrolyte is injected, and the battery case is sealed.

[0005] Secondary batteries are divided into pouch types and can types depending on the material of the case that houses the electrode assembly. Pouch types house the electrode assembly in a pouch made of a flexible polymer material, while can types house the electrode assembly in a case made of metal or plastic.

[0006] After stacking the electrodes and separators, a sealing device that generates high temperature and pressure is used to seal the electrodes inside the separator. The sealing device applies pressure and heat to the separator to seal the electrodes inside the separator. In particular, when the sealing device seals the corners of the separator, precise operation is required to prevent damage to the electrode assembly. Specifically, during the corner sealing operation of the sealing device, process problems can occur, such as electrode bending and cracking due to contact between the sealing device and the electrodes, or separator lifting due to the sealing device.

[0007] To prevent this, there is a need for a sealing device and a sealing method that can seal the separator more precisely, thereby preventing electrode damage and improving process efficiency. Summary of the Invention [Problem to be solved by the invention]

[0008] One problem to be solved by the present invention is to provide an electrode assembly sealing device and method that can precisely seal the separator of the electrode assembly, thereby preventing electrode damage and improving process efficiency. [Means for solving the problem]

[0009] An electrode assembly sealing device according to an embodiment of the present invention may seal a plurality of separators in an electrode assembly in which a plurality of electrode plates and a plurality of separators are alternately stacked. The electrode assembly sealing device may include a pressure unit that applies pressure to the plurality of separators and a moving unit that moves the pressure unit toward the electrode assembly, and the pressure unit may include a pressure surface that is parallel to the cut corners of the electrode plates.

[0010] The pressure surface of the pressure unit may form an angle of 25 to 35 degrees with respect to the overall length of the electrode assembly.

[0011] The pressure surface of the pressure unit may form an angle of 25 to 35 degrees with respect to the overall width direction of the electrode assembly.

[0012] The pressure unit may be provided in plurality so as to be disposed at a plurality of corners of the electrode assembly.

[0013] The moving unit can move the pressing unit in a first direction parallel to the overall length of the electrode assembly and a second direction parallel to the overall width of the electrode assembly so that the pressing unit presses the plurality of separators.

[0014] The moving unit can move the pressure unit in the first direction and the second direction in turn.

[0015] A sealing method for an electrode assembly according to an embodiment of the present invention may seal a plurality of separators to each other in an electrode assembly in which a plurality of electrode plates and a plurality of separators are alternately stacked. The sealing method for an electrode assembly may include a moving step of moving a pressure unit toward the electrode assembly and a sealing step of the pressure unit pressing and heating the plurality of separators while in contact with the electrode assembly to seal the plurality of separators, wherein the pressure unit may include a pressing surface parallel to a cut corner of the electrode plate.

[0016] The pressure surface of the pressure unit may form an angle of 25 to 35 degrees with respect to the overall length and width directions of the electrode assembly.

[0017] The pressure unit may be provided in plurality so as to be disposed at a plurality of corners of the electrode assembly.

[0018] During the moving step and / or the sealing step, the pressure unit may move in a first direction parallel to a length direction of the electrode assembly and a second direction parallel to a width direction of the electrode assembly. [Effects of the Invention]

[0019] According to a preferred embodiment of the present invention, the pressing surface of the pressing unit for the electrode assembly is designed to be parallel to the cut corners of the electrode plates, thereby minimizing bending and cracking of the electrodes during the sealing process.

[0020] According to a preferred embodiment of the present invention, the sealing process is performed by two-dimensionally moving the pressure unit that presses the electrode assembly using the moving unit, thereby enabling the sealing process to be performed more precisely and improving process accuracy.

[0021] Other effects may be included that can be easily predicted by a person skilled in the art from the configuration according to the preferred embodiment of the present invention. [Brief explanation of the drawings]

[0022] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention described below, serve to further understand the technical concept of the present invention, and the present invention should not be interpreted as being limited solely to the matters shown in such drawings.

[0023] [Figure 1] FIG. 2 is a plan view of an electrode assembly sealing device according to an embodiment. [Figure 2] 1 is a cross-sectional view of an electrode assembly according to one embodiment. [Figure 3] 1 is an enlarged view of a corner and its surroundings of an electrode assembly according to an embodiment; [Figure 4] FIG. 2 is a top view of an electrode assembly and a pressure unit according to one embodiment. [Figure 5] 10A and 10B are schematic diagrams illustrating movement of a pressure member according to one embodiment. [Figure 6] 10A and 10B are schematic diagrams illustrating movement of a pressure member according to one embodiment. [Figure 7] 10 is a flowchart of a sealing method for an electrode assembly according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0024] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The present invention will now be described in detail with reference to the accompanying drawings, in order to enable those skilled in the art to easily carry out the present invention. However, the present invention may be embodied in various different forms and should not be construed as being limited to the following embodiments.

[0025] In order to clearly explain the present invention, detailed descriptions of parts that are not relevant to the description or related known technologies that may obscure the gist of the present invention will be omitted, and when referring to components in each drawing in this specification, the same or similar reference symbols will be used throughout the specification to refer to the same or similar components.

[0026] Furthermore, the terms and words used in this specification and claims should not be interpreted in a limited way to their ordinary or dictionary meanings, but should be interpreted in a way that is consistent with the technical idea of ​​the present invention, in accordance with the principle that inventors can appropriately define the concepts of terms in order to best explain their inventions.

[0027] FIG. 1 is a plan view of an electrode assembly sealing device 1 according to an embodiment.

[0028] Referring to FIG. 1 , an electrode assembly sealing device 1 (hereinafter, "sealing device") is positioned outside an electrode assembly A and can seal the electrode assembly A. For example, the sealing device 1 can be positioned at each corner of the electrode assembly A and seal each corner of the electrode assembly A by applying pressure and heat to the electrode assembly A. Specifically, for an electrode assembly A composed of an electrode plate E and a separator S, the sealing device 1 seals the separator S while the electrode plate E is positioned inside the separator S, thereby isolating the electrode plate E from the external environment. After corner sealing, in which each corner of the electrode assembly A, i.e., each corner of the separator S, is sealed, a main sealing, in which each corner of the separator S is sealed, can be performed.

[0029] Since corner sealing is followed by main sealing, it may be important to prevent the electrode plate E from being damaged or the separator S from floating during the corner sealing process. The sealing device 1 can seal the corners of the electrode assembly A to prevent such problems and move more smoothly to main sealing.

[0030] FIG. 2 is a cross-sectional view of an electrode assembly A according to one embodiment.

[0031] Referring to FIG. 2, the electrode assembly A may include a plurality of alternately stacked electrode plates E and a plurality of separators S. The plurality of electrode plates E may include a configuration in which positive and negative electrode plates are alternately arranged. In this case, a separator S may be inserted between the positive and negative electrode plates. The electrode assembly A may be impregnated with an electrolyte. The electrolyte may facilitate active ion movement between the positive and negative electrode plates, and the separator S may block contact between the positive and negative electrode plates, thereby ensuring the stability of the electrode assembly A. The separator S may include a synthetic resin material such as polyethylene or polypropylene, which is chemically inert to ions and provides physical rigidity.

[0032] FIG. 3 is an enlarged view of a corner and its surroundings of an electrode assembly according to an embodiment.

[0033] 3, the corners of the electrode plate E may include cut portions. Specifically, a portion of each corner of the electrode plate E may be cut at a predetermined angle based on the stacking direction of the electrode plate E and the separator S, i.e., when viewed from above from which the sealing device 1 and the electrode assembly A are visible. This structure can further reduce damage to the electrode plate E due to penetration of the sealing device 1 into the inside of the separator S during the process of sealing the corners of the separator S.

[0034] In FIG. 3, each corner of the electrode plate E may be cut at a predetermined angle a. For example, each corner of the electrode plate E may be cut at the predetermined angle a in the entire direction or width direction of the electrode plate E. The predetermined angle a may be within a range of 25 degrees to 35 degrees. That is, the corners may be formed so that an inclined surface is formed at an angle of 25 degrees to 35 degrees with respect to the front or rear surface of the electrode plate E. Alternatively, the corners may be formed so that an inclined surface is formed at an angle of 25 degrees to 35 degrees with respect to the side surface of the electrode plate E.

[0035] The sealing device 1 may include a pressure applying part 11 and a moving part 12 .

[0036] The pressure unit 11 can apply pressure to a plurality of separators S. For example, a plurality of pressure units 11 can be positioned at each corner of the separator S and contact each corner of the separator S to apply pressure to the plurality of separators S. The high heat from a heating unit (not shown) described below and the high pressure from the pressure units 11 can seal each corner of the separator S that was stacked with the electrode plate E, and the electrode plate E can be separated from the outside by the separator S.

[0037] FIG. 4 is a top view of the electrode assembly A and the pressure unit 11 according to one embodiment.

[0038] Referring to FIG. 4, the pressure unit 11 may include a pressure surface 11a parallel to the cut corner of the electrode plate E. In other words, when the pressure unit 11 contacts the separator S and applies pressure, the pressure surface 11a to which the pressure unit 11 applies pressure and the surface of the cut corner of the electrode plate E facing the pressure surface 11a may be parallel to each other. Specifically, based on the stacking direction of the electrode plate E and the separator S, i.e., as viewed from above from which the sealing device 1 and the electrode assembly A are visible, the pressure surface 11a and the cut portion of the corner of the electrode plate E face each other. In this case, the pressure surface 11a and the cut portion of the corner of the electrode plate E may be parallel to each other. More specifically, as shown in FIG. 4, the pressure surface 11a of the pressure unit 11 may include a sloped surface at a predetermined angle b. The predetermined angle b of the sloped surface may be an angle relative to the entire length or width direction of the pressure surface 11a.

[0039] For example, the pressure application surface 11a of the pressure application unit 11 may form an angle of 25 to 35 degrees with respect to the overall length of the electrode assembly A. In other words, the angle at which the pressure application surface 11a of the pressure application unit 11 is inclined with respect to both side surfaces of the electrode assembly may be 25 to 35 degrees.

[0040] Alternatively, the pressing surface 11a of the pressing unit 11 may form an angle of 25 degrees to 35 degrees with respect to the overall width direction of the electrode assembly A. In other words, the inclination angle of the pressing surface 11a of the pressing unit 11 with respect to the front or rear surface of the electrode assembly A may be 25 degrees to 35 degrees.

[0041] In other words, the angle of the pressure surface can be designed to vary depending on the cut angle of the cut surface at the corner of the electrode plate E. That is, if the corner of the electrode plate E includes a cut surface at an angle of 30 degrees relative to the overall width direction, the pressure surface can also include an inclined surface at an angle of 30 degrees relative to the overall width direction of the pressure portion 11.

[0042] Specifically, if the pressing surface 11a of the pressing unit 11 forms an angle of less than 25 degrees with respect to the overall width direction of the electrode assembly A, the pressing surface 11a may contact each corner of the electrode assembly A approximately parallel to the front or rear surface of the electrode assembly A, which may result in a decrease in sealing strength at each corner of the electrode assembly A. Furthermore, since the pressing surface 11a is formed so as not to correspond to the inclined surfaces of the corners of the electrode plate E, the electrode plate E may be worn or cracked during the corner sealing process of the electrode assembly A.

[0043] Furthermore, if the pressing surface 11a of the pressing unit 11 forms an angle of more than 35 degrees with respect to the overall width direction of the electrode assembly A, that is, if the pressing surface 11a forms an angle of 35 degrees to 45 degrees with respect to the overall width direction of the electrode assembly A, the pressing surface 11a is arranged to be excessively inclined with respect to the front or rear surface of the electrode assembly A, and the pressing surface 11a is formed so as not to correspond to the inclined surfaces of the corners of the electrode plate E, which may cause a problem of the electrode plate E being worn or cracked during the corner sealing process of the electrode assembly A.

[0044] Similarly, if the pressing surface 11a of the pressing unit 11 forms an angle of less than 25 degrees with respect to the overall length of the electrode assembly A, the pressing surface 11a may contact each corner of the electrode assembly A approximately parallel to the side surface of the electrode assembly A, which may reduce the sealing strength of each corner of the electrode assembly A. Furthermore, since the pressing surface 11a is formed so as not to correspond to the inclined surfaces of the corners of the electrode plate E, the electrode plate E may be worn or cracked during the corner sealing process of the electrode assembly A.

[0045] Furthermore, if the pressing surface 11a of the pressing unit 11 forms an angle of more than 35 degrees with respect to the overall length of the electrode assembly A, that is, if the pressing surface 11a forms an angle of 35 to 45 degrees with respect to the overall length of the electrode assembly A, the pressing surface 11a will be positioned so as to be excessively inclined with respect to the side of the electrode assembly A, and the pressing surface 11a will be formed so as not to correspond to the inclined surface of the corner of the electrode plate E, which may result in the electrode plate E being worn or cracked during the corner sealing process of the electrode assembly A.

[0046] While the pressing unit 11 applies pressure to the separator S, the pressing unit 11 also applies pressure to the electrode plate E inside the separator S, and this structure can further reduce the pressure transmitted to the electrode plate E by the pressing unit 11. In other words, because the pressing surface of the pressing unit 11 and the cut surface of the corner of the electrode plate E are parallel to each other, the corner of the electrode plate E receives pressure from the pressing surface over a wider area, and this structure can minimize the pressure of the pressing unit 11 on the electrode plate E.

[0047] As a result, the pressure applied to the electrode plate E is minimized due to the structure of the pressure unit 11, which reduces damage and wear to the electrode plate E during the sealing process, resulting in the production of better quality products. Specifically, bending and cracking of the electrode plate E due to contact between the pressure unit 11 and the electrode plate E is more effectively prevented, resulting in a higher yield of finished products.

[0048] The moving unit 12 can move the pressure unit 11 toward the electrode assembly A. For example, the moving unit 12 can be connected to the pressure unit 11 and move the pressure unit 11 to various angles and positions using a transportation means such as a motor.

[0049] FIG. 5 is a schematic diagram illustrating the movement of the pressure member 11 according to one embodiment.

[0050] 5, the moving unit 12 can move the pressing unit 11 in a first direction parallel to the overall length of the electrode assembly A so that the pressing unit 11 presses the plurality of separators S. In other words, the moving unit 12 can move the pressing unit 11 toward the electrode assembly A in the same direction as the length of the electrode assembly A. That is, with reference to FIG. 5, the moving unit 12 can move the pressing units 11 located above and below the electrode assembly A upward and downward, respectively.

[0051] FIG. 6 is a schematic diagram illustrating the movement of the pressure member 11 according to one embodiment.

[0052] 6, the moving unit 12 can move the pressure unit 11 in a second direction parallel to the overall width direction of the electrode assembly A. In other words, the moving unit 12 can move the pressure unit 11 toward the electrode assembly A in a direction perpendicular to the length direction of the electrode assembly A. That is, with reference to FIG. 6, the moving unit 12 can move the pressure units 11 located on both sides of the electrode assembly A toward the electrode assembly A.

[0053] In the order in which the moving unit 12 moves the pressure unit 11, the moving unit 12 can move the pressure unit 11 in the first direction and then in the second direction in that order. That is, the moving unit 12 can first move the pressure unit 11 in the first direction, and then move it in the second direction in that order. However, the order in which the moving unit 12 moves is not limited to the above order, and the moving unit 12 can move the pressure unit 11 in the second direction and then move it in the first direction. Alternatively, the moving unit 12 can move the pressure unit 11 in the first direction and the second direction simultaneously, allowing the pressure unit 11 to move and contact more freely and effectively.

[0054] Based on this operating principle, while conventional sealing devices operate only in a first direction, i.e., the length direction of the electrode assembly, and apply pressure by moving a pressure unit to the electrode assembly, the electrode assembly sealing device 1 according to one embodiment can perform a more precise sealing process using the moving unit 12. Specifically, conventional sealing devices operate the pressure unit only in one direction, i.e., the length direction of the electrode assembly, resulting in a problem of the separators of the electrode assembly separating and creating gaps. In contrast, the electrode assembly sealing device 1 according to one embodiment moves the pressure unit 11 in the first direction and then in the second direction, or in the second direction and then in the first direction, thereby moving the pressure unit 11 depending on the situation, thereby performing a more fluid and accurate sealing process. Therefore, the electrode assembly sealing device 1 can prevent problems such as lifting and cracking of the separator S during the sealing process.

[0055] As a result, by the electrode assembly sealing device 1 moving the pressure unit 11 in the first and second directions, the electrode assembly sealing device 1 can increase the efficiency of the corner sealing process and improve the quality of the manufactured products.

[0056] The sealing apparatus 1 may further include a heating unit (not shown). The heating unit (not shown) is connected to the pressure unit 11 and can apply heat to the electrode assembly A. For example, the heating unit (not shown) may include a heating means to generate heat and transfer the generated heat to the electrode assembly A via the pressure unit 11, which is physically connected to the heating unit (not shown). The electrode assembly A that has received high-temperature heat from the heating unit (not shown) can be sealed by a thermal fusion process.

[0057] The following will disclose a sealing method 2 for an electrode assembly. Explanation of concepts that overlap with the above-mentioned configuration will be omitted.

[0058] FIG. 7 is a flowchart of a method for sealing an electrode assembly according to another embodiment.

[0059] Hereinafter, a sealing method for an electrode assembly will be described as another embodiment of the present invention.

[0060] 7, the electrode assembly sealing method can seal an electrode assembly A composed of an electrode plate E and a separator S. Specifically, the electrode assembly sealing method can seal the separator S with the electrode plate E positioned inside the separator S. In other words, the electrode assembly sealing method 2 can seal each corner of the electrode assembly A, i.e., each corner of the separator S, and the electrode assembly A with each corner sealed can be completely sealed by undergoing the main sealing process.

[0061] The sealing method of the electrode assembly may include a moving step 21 (S21) and a sealing step 22 (S22).

[0062] In the moving step (S21), the pressure applying unit 11 can move toward the electrode assembly A. For example, a sealing device 1 that seals the corners of the separator S includes a moving unit 12 and a pressure applying unit 11, and the pressure applying unit 11 can move by the moving unit 12 and come into contact with the electrode assembly A.

[0063] In the sealing step (S22), the pressure unit 11 may apply pressure and heat to the plurality of separators S while in contact with the electrode assembly A, thereby sealing the plurality of separators S. In this case, the pressure unit 11 may include a pressure surface parallel to the cut corners of the electrode plate E. Specifically, the pressure surface of the pressure unit 11 and the cut surfaces of the corners of the electrode plate E facing the pressure surface may be parallel to each other. More specifically, the pressure surface of the pressure unit 11 may form an angle of 25 degrees to 35 degrees with respect to the overall length and width directions of the electrode assembly A. Similarly, the cut angles of the cut surfaces of the corners of the electrode plate E may form an angle of 25 degrees to 35 degrees with respect to the overall length and width directions of the electrode assembly A. That is, the angle of the pressure surface 11a may be designed to vary depending on the cut angles of the cut surfaces of the corners of the electrode plate E, and the respective surfaces may be parallel to each other.

[0064] According to this structure, the pressure of the pressure unit 11 that the electrode plate E receives during the sealing process is reduced, and bending and cracking of the electrode plate E can be more effectively prevented.

[0065] In the moving step (S21) and / or the sealing step (S22), the pressure unit 11 can move in a first direction parallel to the length direction of the electrode assembly A and in a second direction parallel to the width direction of the electrode assembly A.

[0066] According to this operating principle, while conventional sealing devices 1 operate the pressure unit 11 only in the longitudinal direction of the electrode assembly A, in the sealing method of an electrode assembly according to one embodiment, the moving unit 12 moves the pressure unit 11 in the longitudinal direction of the electrode assembly A and in a direction perpendicular to the longitudinal direction, thereby preventing the separators S of the electrode assembly A from separating or creating gaps.

[0067] The above description is merely an illustrative example of the technical concept of the present invention, and various modifications and variations can be made by a person having ordinary knowledge in the technical field to which the present invention pertains without departing from the essential characteristics of the present invention.

[0068] Therefore, the embodiments disclosed in the present invention are intended to illustrate, not limit, the technical idea of ​​the present invention, and the scope of the technical idea of ​​the present invention is not limited by such embodiments.

[0069] The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent range thereof should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0070] 1. Electrode assembly sealing device 11 Pressurizing section 12 Moving section 2. Sealing method for electrode assembly 21 Movement Steps 22 Sealing Step A Electrode assembly E Electrode plate S Separator

Claims

1. 1. An electrode assembly sealing device for sealing a plurality of separators to each other in an electrode assembly in which a plurality of electrode plates and a plurality of separators are alternately stacked, a pressure unit that applies pressure to the plurality of separators; a moving unit that moves the pressure unit toward the electrode assembly, The pressure applying unit is An electrode assembly sealing device including a pressure surface parallel to the cut corner of the electrode plate.

2. The electrode assembly sealing device according to claim 1 , wherein the pressure surface is formed to be inclined to correspond to the inclined shape of the cut corner of the electrode plate.

3. The electrode assembly sealing device of claim 2, wherein the pressure surface of the pressure unit forms an angle of 25 to 35 degrees with respect to the overall length of the electrode assembly.

4. The electrode assembly sealing device of claim 2, wherein the pressure surface of the pressure unit forms an angle of 25 to 35 degrees with respect to the entire width direction of the electrode assembly.

5. The electrode assembly sealing device of claim 1 , wherein the pressure unit is provided in a plurality of units so as to be disposed at each of a plurality of corners of the electrode assembly.

6. The moving unit is 6. The electrode assembly sealing device of claim 5, wherein the pressure unit is moved in a first direction parallel to a full length direction of the electrode assembly and a second direction parallel to a full width direction of the electrode assembly so as to pressurize the plurality of separators.

7. The moving unit is The electrode assembly sealing device according to claim 6 , wherein the pressure unit is moved in the first direction and the second direction in sequence.

8. A sealing method for an electrode assembly in which a plurality of electrode plates and a plurality of separators are alternately stacked, the method comprising sealing the plurality of separators to each other, a moving step of moving a pressure unit toward the electrode assembly; a sealing step in which the pressure unit pressurizes and heats the plurality of separators while in contact with the electrode assembly to seal the plurality of separators; The method for sealing an electrode assembly, wherein the pressure unit includes a pressure surface parallel to the cut corner of the electrode plate.

9. The sealing method of claim 8 , wherein the pressure surface is formed to be inclined to correspond to the inclined shape of the cut corner of the electrode plate.

10. 10. The sealing method of claim 9, wherein the pressure surface of the pressure unit forms an angle of 25 to 35 degrees with respect to the entire length or width of the electrode assembly.

11. The method of claim 9, wherein the pressure unit is provided in a plurality of positions at a plurality of corners of the electrode assembly.

12. 10. The sealing method of claim 9, wherein during the moving step and / or the sealing step, the pressure unit moves in a first direction parallel to a length direction of the electrode assembly and a second direction parallel to a width direction of the electrode assembly.

13. A method for producing a positive electrode and a negative electrode, comprising the steps of: applying the electrode active material slurry to a positive electrode current collector and a negative electrode current collector; stacking the positive electrode and the negative electrode on opposite sides of a separator to form an electrode assembly; sealing the positive electrode and the negative electrode inside the separator; and housing the electrode assembly in a battery case and injecting an electrolyte therein. The method for manufacturing a secondary battery, wherein the sealing step is performed by the method for sealing an electrode assembly according to claim 8 .

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