Electrode Assembly and Manufacturing Method of The Same

Abstract

The present disclosure relates to an electrode assembly comprising a separator sheet that is folded in a zigzag shape along a folding line, a first insertion space formed by one surface of the folded separator, a second insertion space formed by the other surface of the folded separator, a first plate portion on which an active material among a positive active material and a negative active material is laminated, and a first protrusion protruding from the first plate portion in a direction perpendicular to the folding line, a first electrode inserted into the first insertion space, and a second electrode inserted into the second insertion space comprising another active material. The electrode assembly also relates to a method for manufacturing the same.

Description

Technology Field

[0001] The present disclosure relates to an electrode assembly and a method for manufacturing the same. Specifically, it relates to an electrode assembly that improves the quality of the electrode assembly and a method for manufacturing the same. Background Technology

[0002] A rechargeable secondary battery (or battery cell) includes an electrode assembly inside. The electrode assembly includes a first electrode, a second electrode, and a separator disposed between the first electrode and the second electrode. Generally, since the first electrode, the second electrode, and the separator are stacked in a unidirectional manner, this is referred to as a stacking method.

[0003] The electrode assembly formed by the stacking method can be manufactured by various methods. One of these methods is a method in which a sheet-shaped separator is folded in a zigzag pattern, and a first electrode and a second electrode are placed in the space formed between the folds. This is called Z-folding or zigzag folding.

[0004] However, in the general Z-folding method, when the unsold (or notched) portions of each electrode are combined into a single lead wire, a short circuit may occur with other electrodes, so it is necessary to prevent this. The problem to be solved

[0005] First, according to one aspect of the present disclosure, the problem is to improve the quality of the electrode assembly.

[0006] Second, according to another aspect of the present disclosure, the problem is to improve the stability of the battery cell.

[0007] Third, according to another aspect of the present disclosure, the problem is to improve the lifespan of the battery cell.

[0008] Meanwhile, the battery cell of the present disclosure can be widely applied in green technology fields such as electric vehicles, battery charging stations, and other applications utilizing batteries, such as solar power generation and wind power generation. Furthermore, the battery cell of the present disclosure can be used in eco-friendly electric vehicles, hybrid vehicles, etc., to prevent climate change by suppressing air pollution and greenhouse gas emissions. means of solving the problem

[0009] An electrode assembly according to the present disclosure may comprise: a separator sheet that is folded in a zigzag shape along a folding line; a first insertion space formed by one side of the folded separator; a second insertion space formed by the other side of the folded separator; a first electrode inserted into the first insertion space, comprising a first plate portion on which an active material among a positive active material and a negative active material is laminated, and a first protrusion protruding from the first plate portion in a direction perpendicular to the folding line; and a second electrode inserted into the second insertion space, comprising another active material.

[0010] In one embodiment, the second electrode may include a second plate portion on which the other active material is laminated; and a second protrusion protruding from the second plate portion in a direction opposite to the direction in which the first protrusion protrudes.

[0011] In one embodiment, the first insertion space and the first electrode are each provided in a plurality, and the plurality of first electrodes can be inserted into the plurality of first insertion spaces and arranged along a first direction in which the folded separator is stacked.

[0012] In one embodiment, the second insertion space and the second electrode are each provided in a plurality, and the plurality of second electrodes can be inserted into each of the plurality of second insertion spaces and arranged along the first direction.

[0013] In one embodiment, the plurality of first electrodes and the plurality of second electrodes may be alternately arranged along the first direction with a portion of the folded separator in between.

[0014] In one embodiment, the folding line is provided in a plurality of portions, and the separator sheet comprises a plurality of first parts; and a plurality of second parts arranged alternately with the plurality of first parts; and each of the plurality of folding lines may be positioned between any one of the first parts and any one of the second parts adjacent to any one of the first parts.

[0015] In one embodiment, the plurality of first parts and the plurality of second parts may each include a first area that overlaps with the first plate portion or the second plate portion; and a second area formed along the perimeter of the first plate portion or the second plate portion.

[0016] Meanwhile, in a method for manufacturing an electrode assembly comprising a first electrode, a second electrode, and a separator formed by folding a separator sheet in a zigzag shape so as to be disposed between the first electrode and the second electrode, the method for manufacturing an electrode assembly according to the present disclosure may include: a step of arranging the first electrode such that a first protrusion provided on one side of the first electrode is arranged parallel to the longitudinal direction of the separator sheet on the separator sheet; a first folding step of folding the separator sheet along one folding line to cover the first electrode; a step of arranging the second electrode such that a second protrusion provided on one side of the second electrode is positioned in a direction opposite to the first protrusion, while overlapping with the first electrode with the folded separator sheet in between; and a second folding step of folding the separator sheet along another folding line to cover the second electrode.

[0017] In one embodiment, the method for manufacturing an electrode assembly according to the present disclosure may further include the step of placing the first electrode, the first folding step, the step of placing the second electrode, and the step of repeating the second folding step N (N is a natural number) times.

[0018] In one embodiment, the direction of movement of the first electrode in the step of placing the first electrode may be opposite to the direction of movement of the second electrode in the step of placing the second electrode. Effects of the invention

[0019] First, according to one embodiment of the present disclosure, the quality of the electrode assembly can be improved.

[0020] Second, according to another embodiment of the present disclosure, the stability of the battery cell can be improved.

[0021] Third, according to another embodiment of the present disclosure, the lifespan of the battery cell can be improved. Brief explanation of the drawing

[0022] FIG. 1 is an example of a battery cell including an electrode assembly according to the present disclosure. FIG. 2 illustrates a cross-section of an electrode assembly according to the present disclosure. FIG. 3 is an example of a separator sheet according to the present disclosure. FIG. 4 schematically illustrates an example of a method for manufacturing an electrode assembly according to the present disclosure. FIG. 5 is a top view of an electrode assembly according to the present disclosure. FIG. 6 is a flowchart illustrating an example of a method for manufacturing an electrode assembly according to the present disclosure. Specific details for implementing the invention

[0023] Hereinafter, the present disclosure will be described in detail with reference to the attached drawings. However, this is merely illustrative and the present disclosure is not limited to the specific embodiments described illustratively.

[0024] Meanwhile, in the present disclosure, battery, secondary battery, and cell all refer to a battery cell capable of charging and discharging.

[0025] FIG. 1 is an example of a battery cell including an electrode assembly according to the present disclosure.

[0026] The battery cell (10) may include an exterior material (15) that includes a receiving space (18) for accommodating an electrode assembly (5) inside, a terrace portion (15t) that extends away from the receiving space (18) along a part of the perimeter of the receiving space (18), and a lead tab portion (11) that is electrically connected to the electrode assembly (5) and protrudes outward through the terrace portion (15t).

[0027] The above receiving space (18) may include the electrode assembly (5) and an electrolyte (not shown) that immerses the electrode assembly (5).

[0028] The electrode assembly (5) may be stacked in a predetermined first direction (e.g., Z direction). The electrode assembly (5) may include a first electrode (51), a second electrode (52), and a separator (53) disposed between the first electrode (51) and the second electrode (52). The separator (53) may be provided in multiple numbers corresponding to the size of the first electrode (51) or the second electrode (52) and stacked. Alternatively, the separator (53) may be formed by folding a single planar separator sheet (53p) in a zigzag pattern, and the first electrode (51) and the second electrode (52) may be disposed between the folded separator (53). The separator (53) according to the present disclosure refers to a separator (53) in which a single separator sheet (53P) is folded in a zigzag shape unless otherwise noted.

[0029] The electrode assembly (5) may be configured such that the first electrode (51) and the second electrode (52) are each provided in multiple numbers, and the multiple first electrodes (51) and the multiple second electrodes (52) are alternately stacked along the first direction. Additionally, the separator (53) may be provided between the multiple first electrodes (51) and the multiple second electrodes (52) arranged alternately, by folding a single separator sheet (53P) in a zigzag pattern.

[0030] The lead tab portion (11) may be electrically connected to the electrode assembly (5) and protrude to the outside of the outer casing (15). More specifically, the lead tab portion (11) may include a first lead tab portion (111) that is electrically connected to the first electrode (51) and protrudes along a predetermined second direction (e.g., -X direction), and a second lead tab portion (112) that is electrically connected to the second electrode (52) and protrudes along a direction opposite to the direction in which the first lead tab portion (111) protrudes (e.g., +X direction).

[0031] FIG. 2 illustrates a cross-section of an electrode assembly according to the present disclosure.

[0032] The electrode assembly (5) according to the present disclosure comprises a separator sheet (53P, see FIG. 3) that is folded in a zigzag shape along a folding line (FL, Folding Line) and a separator (53), a first insertion space (533a) formed by one side (53f, see FIG. 4) of the folded separator (53), a second insertion space (533b) formed by the other side (53r, see FIG. 4) of the folded separator (53), a first plate portion (515) on which an active material (515a) of either a positive active material or a negative active material is laminated, and a first protrusion (511) protruding from the first plate portion (515) in a direction perpendicular to the folding line (FL, see FIG. 3), a first electrode (51) inserted into the first insertion space (533a), and another active material (525b). It may include a second electrode (52) inserted into the second insertion space (533b).

[0033] Additionally, the second electrode (52) may include a second plate portion (525) on which the other active material (525b) is stacked, and a second protrusion (521) protruding from the second plate portion (525) in a direction opposite to the direction in which the first protrusion (511) protrudes.

[0034] As described above, the separator (53) may be formed by folding a single separator sheet (15p) in a zigzag pattern. The zigzag shape may be in the form of a square waveform as shown in FIG. 2. Alternatively, the folded portion of the separator (53) may be provided in the form of a curved surface.

[0035] The first electrode (51) may include a first plate portion (515) on which an active material (515a) of either a positive active material or a negative active material is laminated, and a first protrusion (511) protruding from one corner of the first plate portion (515). While the first plate portion (515) has the active material (515a) laminated thereon, the material forming the first plate portion (515) may be exposed to the outside as is at the first protrusion (511). Therefore, the first protrusion (511) may be referred to as the first uncoated portion. Additionally, the length of one corner of the first plate portion (515) on which the first protrusion (511) protrudes may be longer than the length of the first protrusion (511). That is, the first protrusion (511) can be formed by cutting out a portion of a rectangular plate. Accordingly, the first protrusion (511) can be referred to as the first notching portion.

[0036] The second electrode (52) may include a second plate portion (525) on which one of the positive active material or negative active material, or another active material (525b), is laminated, and a second protrusion (521) protruding from one corner of the second plate portion (525). While the second plate portion (525) has the other active material (525b) laminated thereon, the material forming the second plate portion (525) may be exposed to the outside as is at the second protrusion (521). Therefore, the second protrusion (521) may be referred to as a second uncoated portion. Additionally, the length of one corner of the second plate portion (525) on which the second protrusion (521) protrudes may be longer than the length of the second protrusion (521). That is, the second protrusion (521) can be formed by cutting out a portion of a rectangular plate. Therefore, the second protrusion (521) can be referred to as the second notching portion.

[0037] Referring to FIG. 2, the first protrusion (511) and the second protrusion (521) may protrude in opposite directions. More specifically, the first protrusion (511) and the second protrusion (521) may be positioned in opposite directions with the separator (53) in between. Accordingly, with respect to the separator (53), the first electrode (51) may protrude in a direction away from the first surface (53f), and the second electrode (52) may protrude in a direction away from the other surface (53r).

[0038] The direction in which the first electrode (51) and the second electrode (52) move away from each other may be a second direction perpendicular to the first direction (e.g., X direction).

[0039] The folded separator (53) may include an insertion space (533) formed by the one side (53f) of the separator (53) and the other side (53r) of the separator (53). The insertion space (533) may include a first insertion space (533a) formed by the one side (53f) and a second insertion space (533b) formed by the other side (53r).

[0040] The first insertion space (533a) can accommodate the first electrode (51), and the second insertion space (533b) can accommodate the second electrode (52). The first electrode (51) and the second electrode (52) can be inserted into the first insertion space (533a) and the second insertion space (533b), respectively, by approaching the separator (53) from opposite directions.

[0041] Referring to FIG. 2, the folding line (FL) may not be a single line but a folding area. However, this is merely an example, and since the length of the part where the separator sheet (53P) is folded is relatively smaller than the length of the separator sheet (53P) along the longitudinal direction (DL, see FIG. 3) of the separator sheet (53P), the folding area may also be referred to as the folding line (FL).

[0042] The first protrusion (511) and the second protrusion (521) may each protrude outward from the separator (53) in opposite directions along a direction perpendicular to the folding line (FL) (e.g., the second direction). Through this, the first protrusion (511) and the second protrusion (521) may each be electrically connected to the first lead tab (111) and the second lead tab (112), respectively.

[0043] The first electrode (51) and the second electrode (52) may each be provided in multiple numbers. The multiple first electrodes (51) and the multiple second electrodes (52) may be alternately stacked and arranged along the first direction. The separator sheet (53P) may be folded in a zigzag pattern and placed between the multiple first electrodes (51) and the multiple second electrodes (52).

[0044] Accordingly, the first insertion space (533a) and the second insertion space (533b) may also be formed in multiple numbers equal to the number of the multiple first electrodes (51) and the multiple second electrodes (52).

[0045] That is, the first insertion space (533a) and the first electrode (51) are each provided in multiple numbers, and the multiple first electrodes (51) are each inserted into the multiple first insertion spaces (533a) and arranged along the first direction in which the folded separator (53) is stacked.

[0046] In addition, the second insertion space (533b) and the second electrode (52) are each provided in multiple numbers, and the multiple second electrodes (52) can be inserted into the multiple second insertion spaces (533b) respectively and arranged along the first direction.

[0047] Ultimately, the plurality of first electrodes (51) and the plurality of second electrodes (52) can be arranged alternately along the first direction with a portion of the folded separator (53) in between.

[0048] FIG. 3 is an example of a separator sheet according to the present disclosure.

[0049] Referring to FIG. 3, the folding line (FL) is provided in a plurality of numbers, and the separator sheet (53P) includes a plurality of first parts (531) and a plurality of second parts (532) arranged alternately with the plurality of first parts (531), and each of the plurality of folding lines (FL) can be positioned between any one of the first parts (531) and any one of the second parts (532) adjacent to any one of the first parts (531).

[0050] The above separator sheet (53P) may have a first part (531) and a second part (532) connected to each other along the longitudinal direction (DL) of the separator sheet (53P). However, the separator sheet (53P) may not be in a combined form where the first part (531) and the second part (532) are combined, but rather in a form where the first part (531) and the second part (532) are separated based on the folding line (FL) in a single sheet.

[0051] The first part (531) and the second part (532) can be folded along the folding line (FL) to form the folded separator (53). For example, the first electrode (51) is placed on the first part (531), and the second part (532) is folded so that one side of the second part (532) covers the first electrode (51). This can be referred to as the first folding.

[0052] And, after the first folding, the second electrode (52) may be placed on the other side of the folded second part (532). After the second electrode (52) is placed, another first part (531) adjacent to the folded second part (532) may be folded along the folding line (FL) formed between the folded second part (532) and the other first part (531) to cover the second electrode (52). This may be referred to as the second folding.

[0053] The first part (531) and the second part (532) may be provided in multiple numbers. That is, the separator sheet (53P) may include multiple first parts (531), multiple second parts (532), and a folding line (FL) between any one of the first parts (531) and a second part (532) adjacent to (or connected to) any one of the first parts (531). Accordingly, the folding line (FL) may also be provided in multiple numbers.

[0054] For example, if the number of the plurality of first electrodes (51) is N (N is a natural number) and the number of the plurality of second electrodes (52) is N, the number of the plurality of first parts (531) may be N+1 and the number of the plurality of second parts (532) may be N. Additionally, the number of the plurality of folding lines (FL) may be 2N, the number of the plurality of first insertion spaces (533a) may be N, and the number of the plurality of second insertion spaces (533b) may be N.

[0055] When the plurality of first parts (531) and the plurality of second parts (532) are folded in a zigzag shape with respect to each folding line (FL), the plurality of first parts (531) and the plurality of second parts (532) can be stacked alternately along the first direction (e.g., Z direction).

[0056] FIG. 4 schematically illustrates an example of a method for manufacturing an electrode assembly according to the present disclosure.

[0057] As described above, the electrode assembly (5) according to the present disclosure comprises a separator sheet (53P) that is folded in a zigzag shape with respect to a folding line (FL), a first insertion space (533a) formed by one side (53f) of the folded separator (53), a second insertion space (533b) formed by the other side (53r) of the folded separator (53), a first plate portion (515) on which an active material (515a) of either a positive active material or a negative active material is laminated, and a first protrusion (511) protruding from the first plate portion (515) in a direction perpendicular to the folding line (FL), a first electrode (51) inserted into the first insertion space (533a), and a second electrode (52) inserted into the second insertion space (533b) including another active material (525b). It can be included.

[0058] The first electrode (51) and the second electrode (52) can be inserted into the first insertion space (533a) and the second insertion space (533b) in opposite directions relative to the folded separator (53).

[0059] FIG. 5 is a top view of an electrode assembly according to the present disclosure.

[0060] Referring to FIG. 5, the plurality of first parts (531) and the plurality of second parts (532) may each include a first area (535) that overlaps with the first plate part (515) or the second plate part (525), and a second area (536) formed along the perimeter of the first plate part (515) or the second plate part (525).

[0061] That is, the area of ​​the first part (531) may be greater than or equal to the area of ​​the first plate part (515). Likewise, the area of ​​the second part (532) may be greater than or equal to the area of ​​the second plate part (525).

[0062] Referring to FIGS. 2 and FIGS. 5, the plurality of first protrusions (511) may be bent to be electrically connected to the first lead tab portion (111). Likewise, the plurality of second protrusions (521) may be bent to be electrically connected to the second lead tab portion (112). When the plurality of first lead tab portions (111) are bent to be connected to each other, interference or a short circuit may occur between the plurality of first lead tab portions (111) and the second plate portion (525) positioned between each of the plurality of first lead tab portions (111). Likewise, when the plurality of second lead tab portions (112) are bent to be connected to each other, interference or a short circuit may occur between the plurality of second lead tab portions (112) and the first plate portion (515) positioned between each of the plurality of second lead tab portions (112).

[0063] To prevent this, the first protrusion (511) and the second protrusion (521) may be arranged to face in opposite directions. Additionally, the area of ​​the first part (531) and the area of ​​the second part (532) may be made larger than the area of ​​the first plate part (515) and the area of ​​the second plate part (525), respectively, to prevent a short circuit between the first electrode (51) and the second electrode (52).

[0064] More specifically, when the plurality of first lead tab portions (111) are bent to be connected to each other, the second region (536) of the first part (531) and the second part (532) may interfere with or be connected to each other between the plurality of first lead tab portions (111) and the second plate portion (525) positioned between each of the plurality of first lead tab portions (111), thereby minimizing or preventing a short circuit from occurring.

[0065] Likewise, when bent to be connected to each other with the plurality of second lead tab portions (112), each second region (536) of the first part (531) and the second part (532) may be interfered with or connected to each other between the plurality of second lead tab portions (112) and the first plate portion (515) positioned between each of the plurality of second lead tab portions (112), thereby minimizing or preventing a short circuit.

[0066] FIG. 6 is a flowchart illustrating an example of a method for manufacturing an electrode assembly according to the present disclosure.

[0067] A method for manufacturing an electrode assembly (5) comprising a first electrode (51), a second electrode (52), and a separator (53) formed by folding a separator sheet (53P) in a zigzag shape so as to be disposed between the first electrode (51) and the second electrode (52), wherein the method for manufacturing the electrode assembly (5) according to the present disclosure comprises: a step (S10) of arranging the first electrode (51) such that a first protrusion (511) provided on one side of the first electrode (51) is arranged parallel to the longitudinal direction of the separator sheet (53P); a first folding step (S30) of folding the separator sheet (53P) along a folding line (FL) to cover the first electrode (51); and a first electrode (51) that overlaps with the first electrode (51) with the folded separator sheet (53P) in between, wherein the The method may include a step (S50) of arranging the second electrode (52) such that a second protrusion (521) provided on one side of the second electrode (52) is positioned in a direction opposite to the first protrusion (511), and a second folding step (S70) of folding the separator sheet (53P) based on another folding line (FL) to cover the second electrode (52).

[0068] Specifically, in the step (S10) of placing the first electrode (51), the method of manufacturing the electrode assembly (5) according to the present disclosure may place the first first electrode (51) on the first first part (531) along the longitudinal direction of the separator sheet (53P).

[0069] In addition, the method of manufacturing the electrode assembly (5) according to the present disclosure allows the first second part (532) adjacent to the first first part (531) to be folded toward the first first part (531) to cover the first first electrode (51). That is, one side of the first second part (532) can come into contact with the first first electrode (51).

[0070] Subsequently, the method of manufacturing the electrode assembly (5) according to the present disclosure may place the first second electrode (52) on the other side of the first second part (532). Subsequently, the second first part (531) connected to the first second part (532) may be folded to cover the first second electrode (52).

[0071] Generalizing this, any one first electrode (51) placed in any one of the first parts (531) can be covered by any one second part (532) adjacent to any one of the first parts (531) by folding. Subsequently, the second electrode (52) placed in any one of the second parts (532) can be covered by another first part (531) adjacent to any one of the second parts (532) by folding.

[0072] As described above, in the step (S10) of placing the first electrode (51), the direction of movement of the first electrode (51) may be opposite to the direction of movement of the second electrode (52) in the step (S50) of placing the second electrode (52).

[0073] Thereafter, the method for manufacturing an electrode assembly (5) according to the present disclosure may further include a step (S10) of placing the first electrode (51), a first folding step (S30), a step (S50) of placing the second electrode (52), and a step (S70) of repeating the second folding step N times (N is a natural number) times (S90).

[0074] That is, if the electrode assembly (5) is in the form in which N first electrodes (51) and N second electrodes (52) are stacked along the first direction, the method for manufacturing the electrode assembly (5) according to the present disclosure may repeat the step of placing the first electrode (51) (S10), the first folding step (S30), the step of placing the second electrode (52) (S50), and the second folding step (S70) N times.

[0075] The above description is merely an example of applying the principles of the present disclosure, and other configurations may be included without departing from the scope of the present invention. Explanation of the symbols

[0076] 5: Electrode assembly 51: First electrode 511: Protrusion 1 515: First plate section 515a: Any one active substance 52: Second electrode 521: Second protrusion 525: Second plate section 525b: Another active substance 53: Separator 53P: Separator sheet 531: Part 1 532: Part 2 53f: One side 53r: If you ride 533a: First insertion space 533b: Second insertion space 535: First Zone 536: Second Zone 10: Battery cell 11: Lead tab section 111: First lead tab section 112: Second lead tab section 18: Accommodation space 15: Exterior materials 15t: Terrace section FL: Folding line

Claims

Claim 1 An electrode assembly comprising: a separator sheet that is folded in a zigzag shape along a folding line; a first insertion space formed by one side of the folded separator; a second insertion space formed by the other side of the folded separator; a first electrode inserted into the first insertion space, comprising a first plate portion on which an active material of either a positive active material or a negative active material is laminated, and a first protrusion protruding from the first plate portion in a direction perpendicular to the folding line; and a second electrode inserted into the second insertion space, comprising another active material. Claim 2 An electrode assembly according to claim 1, wherein the second electrode comprises: a second plate portion on which the other active material is laminated; and a second protrusion protruding from the second plate portion in a direction opposite to the direction in which the first protrusion protrudes. Claim 3 In paragraph 2, the first insertion space and the first electrode are each provided in a plurality, and the plurality of first electrodes are each inserted into the plurality of first insertion spaces and arranged along a first direction in which the folded separator is stacked, forming an electrode assembly. Claim 4 In paragraph 3, the second insertion space and the second electrode are each provided in a plurality, and the plurality of second electrodes are each inserted into the plurality of second insertion spaces and arranged along the first direction, forming an electrode assembly. Claim 5 In paragraph 4, the plurality of first electrodes and the plurality of second electrodes are an electrode assembly arranged alternately along the first direction with a portion of the folded separator in between. Claim 6 In paragraph 4, the folding line is provided in a plurality of portions, and the separator sheet comprises a plurality of first parts; and a plurality of second parts arranged alternately with the plurality of first parts; and each of the plurality of folding lines is an electrode assembly located between any one of the first parts and any one of the second parts adjacent to any one of the first parts. Claim 7 An electrode assembly according to claim 6, wherein each of the plurality of first parts and the plurality of second parts comprises: a first region overlapping with the first plate portion or the second plate portion; and a second region formed along the perimeter of the first plate portion or the second plate portion. Claim 8 A method for manufacturing an electrode assembly comprising a first electrode, a second electrode, and a separator formed by folding a separator sheet in a zigzag shape so as to be disposed between the first electrode and the second electrode, the method comprising: a step of arranging the first electrode such that a first protrusion provided on one side of the first electrode is arranged parallel to the longitudinal direction of the separator sheet; a first folding step of folding the separator sheet along a folding line to cover the first electrode; a step of arranging the second electrode such that a second protrusion provided on one side of the second electrode is positioned in a direction opposite to the first protrusion, while overlapping with the first electrode with the folded separator sheet in between; and a second folding step of folding the separator sheet along another folding line to cover the second electrode. Claim 9 A method for manufacturing an electrode assembly according to claim 8, further comprising the step of placing the first electrode, the first folding step, the step of placing the second electrode, and the step of repeating the second folding step N times (N is a natural number). Claim 10 A method for manufacturing an electrode assembly according to claim 8, wherein the direction of movement of the first electrode in the step of placing the first electrode is opposite to the direction of movement of the second electrode in the step of placing the second electrode.

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