Baffle including unevenness, electrode assembly including the same, and method of manufacturing electrode assembly

Abstract

The present invention relates to a separator including a polyolefin-based separator substrate and a coating part formed on at least a portion of an outer surface of the separator substrate, in which an uneven part is formed along an outer periphery of at least one side of the separator, whereby the separator sheet can be prevented from deviating from a moving direction during transfer of the separator sheet and stacking of an electrode assembly.

Description

Technical Field

[0001] This application claims priority to Korean Patent Application No. 2021-0083153, filed on June 25, 2021, and Korean Patent Application No. 2022-0022914, filed on February 22, 2022, the disclosures of which are incorporated herein by reference in their entirety.

[0002] The present invention relates to a separator including an uneven portion, an electrode assembly including therein, and a method for manufacturing said electrode assembly. More specifically, the present invention relates to a separator for a secondary battery comprising an uneven portion formed at the end of each side of the separator to prevent the separator from deviating from a movement path due to sliding during the manufacture of the electrode assembly; an electrode assembly including therein; and a method for manufacturing said electrode assembly. Background Technology

[0003] Lithium-ion batteries can be manufactured by housing an electrode assembly configured such that a separator is inserted between the positive and negative electrodes in a battery casing, injecting electrolyte, and hermetically sealing the battery casing.

[0004] The separator, which interrupts the electrical connection between the positive and negative electrodes and thus ensures insulation, can be configured with a structure in which a coating comprising inorganic materials and adhesives is formed on a polyolefin-based separator substrate made of porous material to allow lithium-ion movement. The polyolefin-based material has low heat resistance, and its high-temperature safety and mechanical properties can be improved by adding the coating.

[0005] The process of forming a coating on a separator substrate can be performed by coating the separator sheet while transferring it in a roll-to-roll manner. However, during the transfer of the separator, the separator may slide off the transfer rollers, thereby deviating from its direction of movement.

[0006] In addition, unit electrodes can be disposed on the separator sheet, and the unit electrodes and another unit electrode can be stacked and laminated to manufacture an electrode assembly. When the separator is transferred in a state deviating from its direction of movement, however, the positions of the electrodes disposed on the separator may change, thereby the electrodes in the electrode assembly may not be aligned with each other.

[0007] In addition, when separators and electrodes with coatings formed thereon are stacked and laminated, it is difficult to adequately ensure the adhesion between the electrodes and separators, or the adhesion between the separators, solely through the lamination process. If adhesion is not adequately ensured, separators with low adhesion to the electrodes may fold during transfer, potentially causing short circuits between electrodes with different polarities.

[0008] In this regard, Patent Document 1 discloses a polyolefin-based composite microporous membrane configured such that a coating is formed on the polyolefin-based microporous membrane, the coating being formed at a distance from the edge perimeter of the polyolefin-based microporous membrane, and a thermally fused section being formed in the uncoated area where no coating is formed.

[0009] Although Patent Document 1 discloses a separator configured such that a thermally fused section is formed at the outer periphery of a polyolefin-based composite microporous membrane, wherein the separator is thermally fused to the bag, it does not disclose a structure that can prevent the separator from sliding during transfer.

[0010] In Patent Document 2, uncoated portions without ceramic coating are provided at the ends of the upper and lower portions of the separator sheet, and the uncoated portions are welded together in a state where the two separators are in close contact with each other, thereby forming a bag-shaped separator with a positive electrode sheet housed therein.

[0011] In Patent Document 2, the bag-shaped separator can be used to securely fix the electrode; however, it may not be possible to prevent the separator from sliding during transfer.

[0012] Therefore, there is a need for a technology that can align the septum and electrodes with each other so that the positions of the septum and electrodes are consistent with each other without additional devices such as position sensors, stably fix the electrodes, and prevent the septum from deviating from its direction of movement.

[0013] (Existing technical literature)

[0014] (Patent Document 1) Korean Patent Registration No. 1904160 (October 5, 2018)

[0015] (Patent Document 2) Japanese Patent Application Publication No. 2013-161633 (August 19, 2013) Summary of the Invention

[0016] Technical issues

[0017] The present invention addresses the above-mentioned problems, and the object of the present invention is to provide a partition including an uneven portion that prevents the partition from deviating from its direction of movement and stably fixes the electrode; an electrode assembly including the same; and a method for manufacturing the electrode assembly.

[0018] Technical solution

[0019] To achieve the above-mentioned objectives, the separator according to the invention comprises a polyolefin-based separator substrate and a coating portion formed on at least a portion of the outer surface of the separator substrate, wherein an uneven portion is formed along the outer periphery of at least one side of the separator.

[0020] In the partition according to the present invention, the uncoated portion on which the coating portion is not formed may be located on at least one side of the outer periphery of the partition substrate, the coating portion may be the remaining portion of the partition substrate excluding the uncoated portion, and the uneven portion may be formed on the uncoated portion.

[0021] In the partition according to the invention, the partition may include a first outer periphery parallel to the direction of movement of the partition sheet and a second outer periphery perpendicular to the first outer periphery, and the uneven portion may be formed at the end of the first outer periphery to extend in a direction toward the central axis of the direction of movement of the partition sheet.

[0022] In the partition according to the invention, the partition may include a first outer periphery parallel to the direction of movement of the partition sheet and a second outer periphery perpendicular to the first outer periphery, and the uneven portion may be formed at the first outer periphery and the second outer periphery.

[0023] In the partition according to the invention, the uneven portion may be formed to have a uniform width.

[0024] In the partition according to the invention, the uneven portion may be formed on one of the opposing outer surfaces of the partition substrate.

[0025] Alternatively, the unevenness may be formed on each of the opposing outer surfaces of the partition substrate.

[0026] The present invention provides an electrode assembly including the partition, wherein the partition includes a first partition and a second partition, a first electrode, the first partition, the second electrode, and the second partition are stacked, the first electrode includes a first electrode tab, the second electrode includes a second electrode tab, and the first partition and the second partition are adhered to each other at their outer peripheral edges protruding from the first electrode tab and the second electrode tab.

[0027] In the electrode assembly according to the invention, the first electrode tab and the second electrode tab may protrude in different directions, an uneven portion may be formed at each of the outer periphery of the first partition and the outer periphery of the second partition from which the first electrode tab and the second electrode tab respectively protrude, and the first partition and the second partition may adhere to each other at the uneven portion.

[0028] In the electrode assembly according to the invention, the first separator and the second separator may have the same area, and the area of ​​the first separator and the second separator may be larger than the area of ​​the first electrode and the second electrode.

[0029] The present invention provides a method for manufacturing the electrode assembly. Specifically, the method includes: (a) preparing a separator substrate; (b) forming a coating portion on at least a portion of the outer surface of the separator substrate; (c) forming an uneven portion at the outer periphery of each opposite side of a separator having the coating portion formed thereon; (d) sequentially stacking a first separator having the uneven portion formed thereon, a first electrode, a second separator having the uneven portion formed thereon, and a second electrode; and (e) thermally fusing the uneven portions of the first separator and the second separator together.

[0030] In the electrode assembly manufacturing method according to the present invention, the separator can be manufactured by forming the uneven portion at the outer periphery of each opposite side of the separator substrate and forming the coating portion on the remaining portion of the separator substrate where the uneven portion is not formed.

[0031] In the electrode assembly manufacturing method according to the invention, step (c) can be performed using a method that allows the separator substrate to pass between a pair of rollers, each having embossed portions formed on its surface.

[0032] In the electrode assembly manufacturing method according to the invention, step (e) may include laminating the stacked first partition, the first electrode, the second partition, and the second electrode, wherein the first partition and the second partition may be thermally fused to each other at their outer periphery protruding from the first electrode tab and the second electrode tab.

[0033] In addition, the present invention can provide feasible combinations of the above solutions.

[0034] Beneficial effects

[0035] As is evident from the above description, in this invention, the uneven portion is formed at the outer periphery of the partition, thereby preventing the partition from sliding or deviating from its direction of movement during partition transfer.

[0036] As a result, the electrodes and separators can be stacked so that their outer peripheries are arranged parallel to each other, thereby preventing misalignment between the electrodes and separators in the electrode assembly.

[0037] In addition, thermal fusion can be performed between the partitions at the uneven parts during the lamination process, thereby stably fixing the electrodes between the partitions.

[0038] As described above, the outer periphery of the partition is fixed to each other by thermal fusion, thereby preventing short circuits caused by the folding of the partition when it is not fixed. Attached Figure Description

[0039] Figure 1This is a perspective view of the partition according to the present invention.

[0040] Figure 2 It is a perspective view showing the process of forming an uneven area on the uncoated area.

[0041] Figure 3 This shows the cutting process from the partition sheet. Figure 1 A perspective view of the partition process.

[0042] Figure 4 These are exploded perspective views and vertical cross-sectional views of the electrode assembly according to the present invention.

[0043] Figure 5 This is a schematic diagram illustrating the manufacturing process of the electrode assembly according to the present invention. Detailed Implementation

[0044] Preferred embodiments of the invention will now be described in detail with reference to the accompanying drawings, enabling those skilled in the art to readily implement these preferred embodiments. While the operational principles of the preferred embodiments are described in detail, detailed descriptions of known functions and configurations incorporated herein will be omitted where they might obscure the subject matter of the invention.

[0045] In addition, the same reference numerals will be used throughout the accompanying drawings to refer to parts that perform similar functions or operations. Where a part is referred to as "connected to another part" throughout the specification, this means not only that the one part is directly connected to the other part, but also that the one part is indirectly connected to the other part via yet another part. Furthermore, including a particular element does not imply the exclusion of other elements, but rather means that these elements may be further included unless otherwise specified.

[0046] In addition, descriptions of elements by limiting or adding are applicable to all inventions unless otherwise specified, and do not limit any particular invention.

[0047] Furthermore, in the description of the invention and the claims of this application, the singular form is intended to include the plural form, unless otherwise stated.

[0048] Furthermore, in the description of the invention and the claims of this application, "or" includes "and" unless otherwise mentioned. Therefore, "including A or B" means three cases: including A, including B, and including both A and B.

[0049] In the following description, embodiments of the invention will be described in detail with reference to the accompanying drawings.

[0050] Figure 1 This is a perspective view of the partition according to the present invention.

[0051] Reference Figure 1 (a) and (b) each show a partition, wherein (a) shows a partition with a coating portion formed only on its upper surface and a single-sided coating, and (b) shows a partition with a coating portion formed on each of its upper and lower surfaces and a double-sided coating.

[0052] The separator 100 or 200 according to the invention includes a separator substrate 110 or 210 made of a polyolefin-based material and a coated portion 120 or 220 formed on at least a portion of the outer surface of the separator substrate, wherein a non-coated portion 130 or 230 on which no coated portion is formed is positioned along the outer periphery of the separator substrate 110 or 210. That is, the coated portion 120 or 220 is formed on the remaining portion of the separator substrate excluding the non-coated portion 130 or 230, and an uneven portion is formed on the non-coated portion 130 or 230, which is formed along the respective outer periphery of opposite sides of the separator.

[0053] In contrast, however, a structure in which the coating portion 120 or 220 is formed on the entire outer surface of the partition substrate 110 or 210 and the uneven portion is formed on the coating portion 120 or 220 along the respective outer periphery of opposite sides of the partition is included in the present invention.

[0054] The uneven portion may be configured to continuously form protrusions and / or depressions, and the protrusions and / or depressions may have a predetermined pattern. For example, a grid pattern or a slanted pattern may be included as a pattern.

[0055] Because the uneven portion configured as described above has high friction, it prevents the separator sheet from deviating from the direction of movement during transfer. Furthermore, it improves the adhesion between separators due to thermal fusion during the lamination process used to manufacture the electrode assembly. In particular, when the uneven portion is formed on the uncoated portion, the effect of improving adhesion during the thermal fusion process is enhanced.

[0056] The separator substrate 110 includes a first outer periphery 101 parallel to the moving direction A of the separator sheet and a second outer periphery 102 perpendicular to the first outer periphery 101. An uncoated portion 130 is formed at the end of the first outer periphery 101 so as to extend in a direction toward the central axis of the moving direction A of the separator sheet. Since the unevenness is formed on the uncoated portion 130, the effect of preventing separator movement and improving adhesion is achieved.

[0057] In a specific example, the partition substrate may include a first outer periphery parallel to the direction of movement of the partition sheet and a second outer periphery perpendicular to the first outer periphery, and an uncoated portion having an uneven portion formed thereon may be located at each of the first and second outer peripheries.

[0058] The polyolefin-based material may be at least one of the group consisting of polyethylene, polypropylene, and poly-4-methyl-1-pentene, and copolymers thereof, which use ethylene, propylene, α-olefin, and 4-methyl-1-pentene as monomers and comonomers.

[0059] The separator substrate 110 or 210 may have a porous structure to ensure lithium ion mobility.

[0060] Figure 1 (a) shows that the coated portion 120 and the uncoated portion 130 are formed only on the upper surface of the separator substrate, and only the uncoated portion 130 is provided on the lower surface of the separator substrate, without including the coated portion. Figure 1 (b) shows that coated portions 220 and uncoated portions 230 are formed on each of the upper and lower surfaces of the separator substrate. Unevenness may be formed on... Figure 1 On at least a portion of the uncoated portion 130 or 230 shown in (a) or (b).

[0061] The coating may include inorganic particles and a binder to improve the ductility and strength of the separator. The inorganic particles may be selected from the group consisting of alumina, aluminum hydroxide, silica, barium oxide, titanium oxide, magnesium oxide, magnesium hydroxide, clay, glass powder, boehmite, and mixtures thereof.

[0062] The adhesive performs the function of maintaining the bond between inorganic particles and improving the adhesion between the electrode and the separator. There are no particular restrictions on the type of adhesive, as long as it does not chemically alter the coated portion. For example, the adhesive can be selected from polyolefins, such as polyethylene or polypropylene; fluorinated resins, such as polyvinylidene fluoride or polytetrafluoroethylene; fluorinated copolymers, such as vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer, or ethylene-tetrafluoroethylene copolymer; styrene-butadiene copolymers and their hydrides; (meth)acrylate copolymers, such as methacrylate copolymers, acrylonitrile acrylate copolymers, or styrene acrylate copolymers; rubbers, such as ethylene propylene rubber; and polyvinyl acetate. Ester; resins having a melting point or glass transition temperature of 180°C or higher, such as polyphenylene ether, polysulfone, polyethersulfone, polyphenylene sulfide, polyetherimide, polyamide, polyimide, polyamideimide, polyetheramide, polyester, aromatic polyester, or polyetheretherketone; polycarbonate; polyacetal; water-soluble resins made from at least one of the group consisting of carboxyalkyl cellulose, alkyl cellulose, hydroxyalkyl cellulose, starch, polyvinyl alcohol, sodium alginate, polyethylene glycol, cellulose esters, polyacrylic acid, polyacrylamide, or polymethacrylic acid.

[0063] In addition, when the coated portion and the uncoated portion are formed on opposite surfaces of the separator substrate, such as Figure 1 As shown in (b), the adhesives included in the coating portion formed on the upper surface of the separator substrate and the coating portion formed on the lower surface of the separator substrate may be different from each other in type.

[0064] Figure 2 It is a perspective view showing the process of forming an uneven area on the uncoated area.

[0065] Reference Figure 2 A pair of rollers 300 located on the upper and lower surfaces of the partition substrate 110 are positioned at each of the opposite ends of the partition substrate 110 parallel to the direction of movement A. Each roller 300 has an embossed portion 310 formed on its surface. As the partition substrate 110 passes between the rollers 300, a mark with a shape corresponding to the shape of the embossed portion 310 is formed on each of the portions of the partition substrate pressed by the rollers 300. That is, an uneven portion 230' with a rough surface is formed on the smooth surface of the partition substrate, thereby preventing the partition substrate from slipping during the transfer of the partition substrate to the roller-to-roll process.

[0066] Meanwhile, when a partition configured such that the coating portion is formed over the entire area of ​​the partition substrate passes between rollers having embossed portions formed on its surface, a partition having an uneven portion formed on the coating portion can be manufactured.

[0067] Figure 3 This shows the cutting process from the partition sheet. Figure 1 A perspective view of the partition process.

[0068] Reference Figure 3 This shows that it is provided for manufacturing Figure 1 The partition sheet 250 shown in (b) and the partition 200 separated from the partition sheet 250 by cutting with a cutter 400.

[0069] The partition substrate 210 includes a first outer periphery 101 parallel to the moving direction A of the partition sheet 250 and a second outer periphery 102 perpendicular to the first outer periphery 101, and an uncoated portion 230 is formed at the first outer periphery 101 parallel to the moving direction A of the partition sheet 250.

[0070] The uneven portion can be formed on the uncoated portion 230 by pressing the partition substrate with a roller having embossed portions formed on its surface. The uneven portion is formed to have a uniform width W.

[0071] Figure 3 The diagram shows a separator cut from a separator sheet without electrodes attached. In contrast, however, a first separator sheet having a positive electrode plate attached to one side of its outer surface to be spaced apart from each other, and a second separator sheet having a negative electrode plate attached to one side of its outer surface to be spaced apart from each other, can be laminated in a stacked state. Uneven portions of the first and second separator sheets can be bonded together by heating, and the first and second separator sheets can be cut to manufacture an electrode assembly.

[0072] Figure 4 These are exploded perspective views and vertical cross-sectional views of the electrode assembly according to the present invention.

[0073] Reference Figure 4 The diagram illustrates an electrode assembly configured to have two spacers 200 added to the upper and lower surfaces of a second electrode 520. Specifically, a first electrode 510, spacers 200, a second electrode 520, and spacers 200 are stacked sequentially. The first electrode 510 includes a first electrode tab 511, and the second electrode 520 includes a second electrode tab 521. Each spacer 200 is disposed at its respective outer periphery on an opposite side having an uncoated portion 230. An uneven portion is formed on the uncoated portion 230, and the spacers are adhered to each other at their uneven portions by thermal fusion. That is, the spacers 200 are adhered to each other at their protruding outer peripheries from the first electrode tab 511 and the second electrode tab 521.

[0074] The partitions 200 have the same area, and the area of ​​each partition 200 is larger than the area of ​​each of the first electrode 510 and the second electrode 520, so that thermal fusion is performed at the uneven portion of the partition, as described above.

[0075] Although the first electrode 510 and the second electrode 520 can be configured to have the same area, Figure 4 The area of ​​the first electrode 510 is shown to be larger than that of the second electrode 520. When considering the fact that the negative electrode has a larger size due to the irreversibility of lithium ions, the first electrode can be a negative electrode, and the second electrode can be a positive electrode. Alternatively, depending on the types of positive and negative electrode active materials, the first electrode can be a positive electrode, and the second electrode can be a negative electrode.

[0076] The first electrode tab 511 of the first electrode 510 and the second electrode tab 521 of the second electrode 520 protrude in different directions, and an uncoated portion 230 with an uneven portion formed thereon is formed at each of the outer periphery of the separator from which the first electrode tab 511 and the second electrode tab 521 protrude. During the lamination process for manufacturing the electrode assembly, the separators 200 are thus adhered to each other at their uneven portions, and each separator is adhered to at least a portion of the outer surface of the electrode tab, thereby performing lamination therebetween. As described above, since the separators are adhered to the outer surface of the electrode tabs, folding of the separators can be prevented during the manufacturing of the battery cell.

[0077] Alternatively, even when using electrodes configured such that the first electrode tab 511 and the second electrode tab 521 protrude in the same direction, unlike Figure 4 As shown, the same structure can also be applied where adhesion between the uneven portions of the partition is performed while at least a portion of the first electrode contact 511 and the second electrode contact 521 are each covered.

[0078] Figure 5 This is a schematic diagram illustrating the manufacturing process of the electrode assembly according to the present invention.

[0079] Reference Figure 5 In the electrode assembly manufacturing process according to the present invention, the polyolefin-based separator substrate 210 is transferred while being unfolded from the separator roller, and uneven portions 230' are formed on each of the opposite sides of the separator substrate 210. A coating solution is applied to the remaining portion of the separator substrate 210 on which the uneven portions 230' are not formed to form a coated portion 220. As a result, the portion of the separator substrate on which the uneven portions 230' are formed becomes a non-coated portion on which no coating solution is applied, and the coated portion 220 and the non-coated portion on which the uneven portions 230' are formed are together formed on one surface of the separator sheet. Figure 5 The coating portion 220 and the uneven portion 230' are shown to be formed only on the upper surface of the separator substrate 210. However, the coating portion 220 and the uneven portion 230' may also be formed on the lower surface of the separator substrate 210 using the same method as the method for forming the upper coating portion.

[0080] The partition manufactured as described above may include a first partition and a second partition. The first partition, the first electrode 510, the second partition, and the second electrode 520 are stacked sequentially. Pressure and heat are applied to the uneven portions 230' of the first and second partitions in the direction indicated by the dashed arrows, thereby thermally fusing the uneven portions together. Through the above process, the partitions and electrodes can be aligned with each other, so that the positions of the partitions and electrodes are consistent and then fixed to each other. Furthermore, the excess portions of the partitions extending outward beyond the outer periphery of the electrodes can be adhered to each other and then fixed to each other, thereby preventing the excess portions of the partitions from folding or rolling.

[0081] The method of allowing the partition substrate 210 to pass between a pair of rollers 300, each having an embossed portion 310 formed on its surface, can be used as a method for forming the uneven portion 230'.

[0082] The thermal fusion step may include applying heat and pressure to the first partition, first electrode 510, second partition, and second electrode 520 while the first partition, first electrode, second partition, and second electrode are stacked, allowing them to pass between a pair of laminating rollers 320. The first partition and the second partition are thermally fused together with each other from their outer peripheral edges protruding from the first electrode tab 511 and the second electrode tab 521.

[0083] For example, when the adhesion between the first and second partitions is high, the process of thermally fusing the first and second partitions together can be performed after the stack consisting of the first partition, the first electrode, the second partition, and the second electrode passes between laminating rollers. When the adhesion between the first and second partitions is low, on the other hand, the uneven portions can be thermally fused together by the laminating rollers, and the stack can be laminated simultaneously. Alternatively, the uneven portions can be thermally fused together, and then lamination can be performed.

[0084] In a specific example, a method for manufacturing an electrode assembly including a separator having an uneven portion formed on a coated portion of the separator includes (a) the step of preparing a separator substrate; (b) the step of forming a coated portion on at least a portion of the outer surface of the separator substrate; (c) the step of forming an uneven portion at the respective outer periphery of opposite sides of the separator having the coated portion formed thereon; (d) the step of sequentially stacking a first separator having the uneven portion formed thereon, a first electrode, a second separator having the uneven portion formed thereon, and a second electrode; and (e) the step of thermally fusing the uneven portions of the first separator and the uneven portions of the second separator to each other.

[0085] In the step of forming the uneven portion, the uneven portion is formed on the coating portion on the outer surface of the partition substrate.

[0086] That is, the electrode assembly manufacturing method according to the specific examples above is different. Figure 5 The electrode assembly manufacturing method shown in the figure is that the separator is manufactured by forming an uneven portion on the coating portion after the coating portion is formed on the separator substrate.

[0087] Alternatively, in the step of forming the uneven portion, the uneven portion can be formed on the uncoated portion of the partition substrate, such as... Figure 5 As shown in the image.

[0088] In this invention, as described above, the uneven portion can be formed on the outer periphery of the separator in the direction of the protrusion of the electrode tab, thereby improving the adhesion between the separators and further improving the bonding force between the separator and the electrode.

[0089] Those skilled in the art will understand that, based on the above description, various applications and modifications are possible within the scope of this invention.

[0090] (See attached image labels)

[0091] 100, 200: partition

[0092] 101: First peripheral edge

[0093] 102: Second peripheral edge

[0094] 110, 210: Partition substrate

[0095] 120, 220: Coating section

[0096] 130, 230: Uncoated section

[0097] 230': Uneven part

[0098] 250: Partition sheet material

[0099] 300: Roller

[0100] 310: Embossing section

[0101] 320: Laminating roller

[0102] 400: Cutter

[0103] 510: First electrode

[0104] 511: First electrode connector

[0105] 520: Second electrode

[0106] 521: Second electrode connector

[0107] A: Direction of movement of the partition sheet

[0108] W: Width of the uneven part

Claims

1. A partition, comprising: Polyolefin-based separator substrate; and A coating portion formed on at least a portion of the outer surface of the partition substrate, wherein The uneven portion is formed along the outer periphery of at least one side of the partition. The uncoated portion, on which the coating portion is not formed, is located on at least one outer periphery of the partition substrate. The coating portion is the remaining portion of the partition substrate excluding the non-coating portion, and The uneven portion is formed on the uncoated portion, and The separator is used for an electrode assembly, and the separator includes a first separator and a second separator, wherein the first separator and the second separator are adhered to each other at the uneven portion.

2. The partition according to claim 1, wherein The partition includes a first outer periphery parallel to the moving direction of the partition sheet and a second outer periphery perpendicular to the first outer periphery. The uneven portion is formed at the end of the first outer periphery so as to extend in the direction of the central axis toward the moving direction of the partition sheet.

3. The partition according to claim 1, wherein The partition includes a first outer periphery parallel to the moving direction of the partition sheet and a second outer periphery perpendicular to the first outer periphery. The uneven portion is formed at the first outer periphery and the second outer periphery.

4. The partition according to claim 2 or 3, wherein the uneven portion is formed to have a uniform width.

5. The partition according to claim 1, wherein the uneven portion is formed on one of the opposing outer surfaces of the partition substrate.

6. The partition according to claim 1, wherein the uneven portion is formed on each of the opposing outer surfaces of the partition substrate.

7. An electrode assembly comprising a separator according to any one of claims 1 to 6, wherein The partition includes a first partition and a second partition. The first electrode, the first partition, the second electrode, and the second partition are stacked. The first electrode includes a first electrode contact. The second electrode includes a second electrode tab, and The first partition and the second partition are adhered to each other at their outer periphery protruding from the first electrode tab and the second electrode tab.

8. The electrode assembly according to claim 7, wherein The first electrode contact and the second electrode contact protrude in different directions. Uneven portions are formed at each of the outer periphery of the first and second electrode contacts protruding from the outer periphery of the first and second partition plates, respectively. The first partition and the second partition are adhered to each other at the uneven portion.

9. The electrode assembly according to claim 7, wherein The first partition and the second partition have the same area, and The area of ​​the first partition and the second partition is greater than the area of ​​the first electrode and the second electrode.

10. A method of manufacturing an electrode assembly according to claim 7, the method comprising: (a) Preparation of the separator substrate; (b) A coating portion is formed on at least a portion of the outer surface of the partition substrate; (c) An uneven portion is formed at the outer periphery of each of the opposite sides of the partition having the coating portion formed thereon; (d) A first partition having the uneven portion formed thereon, a first electrode, a second partition having the uneven portion formed thereon, and a second electrode are sequentially stacked; and (e) The uneven portion of the first partition and the uneven portion of the second partition are thermally fused together.

11. The method of claim 10, wherein the partition is manufactured by forming the uneven portion at the outer periphery of each opposite side of the partition substrate and forming the coating portion on the remaining portion of the partition substrate where the uneven portion is not formed.

12. The method of claim 10, wherein step (c) is performed using a method that allows the partition substrate to pass between a pair of rollers, each having embossed portions formed on its surface.

13. The method of claim 10, wherein Step (e) includes laminating the stacked first separator, the first electrode, the second separator, and the second electrode, and The first partition and the second partition are thermally fused together at their outer periphery protruding from the first electrode tab and the second electrode tab.

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