KR20190114122A - Method for Manufacturing an Electrode Assembly for a Secondary Battery Having an Embossed Separator - Google Patents

Abstract

The present invention relates to a method of manufacturing an electrode assembly for a secondary battery by winding a sheet type separator in a jelly roll type by interposing the sheet type separator between a sheet type positive electrode and a negative electrode. The method comprises: a step (a) of applying an adhesive on the separator in the form of a stripe extended in the direction crossing the winding direction of the separator; a step (b) of bonding the adhesive-coated separator so that the adhesive-coated surface faces any one electrode between the positive electrode or the negative electrode; a step (c) of passing the assembly of the one electrode and the separator through a guide roller while bending the one electrode to be in contact along the curved surface of the outer circumference of the guide roller to form an embossing on the surface of the separator; and a step (d) of combining the embossed assembly with the other electrode between the positive electrode and the negative electrode and winding up the same in a jellyroll form. Embossing can be efficiently formed on the surface of the separator by the manufacturing method; pores are formed between the electrodes by winding the electrodes together with the embossed separator and manufacturing the electrode assembly; and, by the pores, phenomena such as the bending of an electrode and the detachment of an active material are prevented by alleviating stresses caused by the expansion of the electrode during the charging and discharging of the battery.

Description

Method for manufacturing an electrode assembly for a secondary battery having an embossed separator {Method for Manufacturing an Electrode Assembly for a Secondary Battery Having an Embossed Separator}

The present invention relates to a method of manufacturing an electrode assembly for a secondary battery having an embossed separator, and more particularly, to relieve the stress caused by the expansion of the electrode during charging and discharging of the battery to suppress the phenomenon such as bending of the electrode, desorption of the active material The present invention relates to a method for manufacturing an electrode assembly for a secondary battery having an embossed separator capable of preventing degradation of battery performance.

Recently, as the demand for portable electronic products such as laptops, video cameras, portable telephones, etc. is rapidly increased, and development of electric vehicles, energy storage batteries, robots, satellites, etc. is in earnest, high-performance secondary batteries capable of repeatedly charging and discharging are possible. There is an active research on.

Commercially available secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel-based secondary batteries, and thus are free of charge and discharge. The self-discharge rate is very low and the energy density is high.

Such secondary batteries are generally manufactured by manufacturing an electrode assembly and then embedding them in a battery case and injecting electrolyte, activating a process, and the like. According to the shape of the battery case, the secondary battery may be classified into a cylindrical shape, a square shape, and a pouch type. Among them, a cylindrical or rectangular secondary battery is manufactured by embedding an electrode assembly in a cylindrical or rectangular metal can.

The electrode assembly of the secondary battery is a charge / discharge device having a stacked structure of a cathode, a separator, and a cathode. A jelly-roll type wound through a separator between a sheet-type anode and a cathode, and a plurality of cathode and cathode separators It can be classified into a stack type stacked sequentially in this interposed state, and a stack / folding type in which unit cells of the stack type are wound with a long length of separation film. Among these, the jelly roll type electrode assembly is widely used because it has an advantage of easy manufacturing and high energy density per weight.

The jelly roll type electrode assembly is manufactured by winding a separator 40 interposed between the negative electrode 20 and the positive electrode 30 to which the electrode active material is applied, as shown in FIG. 1A, but the conventional electrode assembly has a flat shape. Since the separator and the electrodes are wound and manufactured by applying a constant tension, the cathode / separator / anode may be brought into close contact with each other as shown in FIG. 1B.

On the other hand, during charging and discharging of the battery, the electrode expands, and stress is generated due to the expansion of the electrode. Since the electrode assembly is wound in a state of being in close contact with each other, the stress generated by the expansion is transferred toward the center of the jelly roll, thereby This twist occurs, and in some cases, the active material layer is cracked or peeled from the current collector. When such a phenomenon occurs, a problem arises in that the distance between electrodes is increased or becomes uneven, so that charging and discharging are not performed smoothly, which causes the capacity of the battery to be reduced.

As a conventional technique for solving the adverse effects due to the expansion of the electrode as described above, Patent Document 1 (Japanese Patent Laid-Open Publication No. 2013-020821) discloses that stress easily acts on the curved portions at both ends of the long diameter direction in an elliptical electrode assembly. In consideration of this, as shown in FIG. 2, waveforms in which the irregularities extending in the width direction are alternately repeatedly formed in one or more of the positive electrode, the negative electrode, and the separator of the portion constituting the curved portion 11 of the electrode assembly 10a in the longitudinal direction. Disclosed is a lithium ion secondary battery having a structure 12 formed thereon. In Patent Document 1, since the stress can be alleviated by the corrugated structure 12, cracking and peeling of the active material can be suppressed and it is advantageous to secure battery performance. However, the method for forming the corrugated structure is described. There is no description.

In addition, Patent Document 2 (Korean Patent Publication No. 10-0670429) discloses a lithium secondary battery in which an embossed portion is formed on a surface of a separator of an electrode assembly to improve the impregnation of an electrolyte solution. In the patent document, as shown in FIG. 3, the separator 40b of the electrode assembly 10b has a flat portion 40b-1 and an embossed portion 40b-2 protruding at least one surface from the flat portion. The jelly roll electrode assembly 10b obtained by winding the separator 40b together with the cathode 20b and the anode 30b may be formed between the electrodes 20b and 30b and the separator 40b. It is described that it is easier to absorb the electrolyte solution compared to the conventional electrode assembly having a gap and the separator and the electrode are in close contact. It is described that the embossed portion 40b-2 of the separator 40b is formed by rolling with an embossing roll.

Patent Document 2, because the gap is formed between the separation membrane 40b and the electrodes on which the embossing portion 40b-2 is formed, can solve the problem of the electrode bending due to the expansion of the electrode as described above to some extent. Although it seems to be present, the porosity of the separator may be impaired when performing the rolling treatment by the embossing roll to form the embossing portion, and there is a limit that the embossing portion is not properly formed on the surface of the separator by the rolling treatment.

Japanese Unexamined Patent Publication No. 2013-020821 Korean Patent Publication No. 10-0670429

Accordingly, the present invention has been made to solve the problems of the prior art as described above, by relieving the stress caused by the expansion of the electrode during charging and discharging of the battery to suppress the phenomenon such as bending of the electrode, desorption of the active material battery performance It is an object of the present invention to provide a method for manufacturing an electrode assembly for secondary batteries having an embossed separator that can prevent the degradation of the film.

In addition, another object of the present invention is to provide an electrode assembly for a secondary battery manufactured by the manufacturing method and a secondary battery including the electrode assembly.

Method of manufacturing an electrode assembly for a secondary battery according to the present invention for achieving the above object,

A method of manufacturing an electrode assembly for a secondary battery by winding a jelly roll in between a sheet-shaped anode and a cathode through a sheet-type separator,

(a) applying an adhesive on the separator in the form of a stripe extending in a direction crossing the winding direction of the separator;

(b) bonding the adhesive-coated separator so that the adhesive application side thereof faces one of the positive and negative electrodes;

(c) passing the assembly of the one electrode and the separation membrane through the guide roller while bending the one electrode to be contacted along the curved surface of the guide roller outer circumference to form an emboss on the surface of the separation membrane; And

(d) winding the embossed conjugate in a jellyroll form by combining with the other electrode of the positive electrode and the negative electrode;

Characterized in that it comprises a.

In one embodiment of the present invention, the separator may be a polyolefin-based polymer porous separator, the polyolefin-based polymer may be polyethylene.

According to one embodiment of the present invention, each stripe in the stripe form may extend in a direction crossing the winding direction of the separator.

According to one embodiment of the present invention, each stripe in the stripe form may extend in the transverse direction perpendicular to the winding direction of the separator.

According to one embodiment of the present invention, the spacing between the stripes in the stripe form may be 1 to 10mm.

In one embodiment of the present invention, the adhesive may be an adhesive that exerts an adhesive force when heat of 135 degrees or less is applied.

According to an embodiment of the present invention, the one electrode in the step (b) may be a cathode.

According to one embodiment of the present invention, in the step (c) it may be to bend the conjugate at an angle of 30 degrees to 180 degrees.

According to one embodiment of the present invention, in the step (c) may be to bend the conjugate at an angle of 60 degrees to 120 degrees.

According to one embodiment of the present invention, it may be further provided with a pressure roller facing the guide roller with the bonding body therebetween.

According to an embodiment of the present invention, the step (c) may be to heat the guide roller.

According to an embodiment of the present invention, the step (c) may be to heat the guide roller to a temperature of 135 ℃ or less.

The present invention also provides a secondary battery electrode assembly manufactured by the above-described manufacturing method of the present invention, and the electrode assembly is built in the battery case.

According to the present invention, an emboss can be efficiently formed on the surface of the separator by simply passing through the guide roller while the electrode of any one of the positive and negative electrodes and the sheet-shaped separator are bonded by an adhesive, and thus the embossed separator and By winding the electrodes together to make an electrode assembly, voids are formed between the electrodes. By the voids, the stress caused by the expansion of the electrode during charge and discharge of the battery is alleviated to prevent phenomena such as the bending of the electrode and the detachment of the active material, thereby preventing the battery performance from being deteriorated. Indicates.

1A is a perspective view illustrating a cathode, an anode, and a separator in a state of being wound with a conventional jellyroll electrode assembly, and FIG. 1B is a cross-sectional view of the jellyroll electrode assembly manufactured by winding completion.
2 is a cross-sectional view schematically showing a part of a cross section of a jellyroll electrode assembly according to an example of the prior art (Patent Document 1).
3 is a sectional view schematically showing a part of a cross section of an electrode assembly according to another example of the prior art (Patent Document 2).
Figure 4 is a plan view showing a sheet-like separator in which the adhesive is applied in the form of a stripe.
5a to 5d schematically show preferred embodiments of step (c) of the present invention, respectively.
It is sectional drawing which expands and shows the cross section of the winding direction of the joined body in which the embossing was formed.
7 is a cross-sectional view schematically showing a horizontal cross section of a jellyroll electrode assembly manufactured according to the present invention.

Hereinafter, the present invention will be described in more detail. Since the specific matters and the contents of the drawings described below are merely illustrative of the embodiments of the present invention, the present invention should not be understood as being limited to such descriptions and contents.

First, the terms used in the present invention are defined. In the present invention, terms such as winding direction, cross direction, and transverse direction are used in relation to the sheet-type separator and the electrode. As shown in FIG. 1A, the winding direction is a direction in which the separator is wound in a jelly roll shape (L axis). Direction), and the lateral direction means a direction perpendicular to the winding direction (W-axis direction), and the crossing direction means a direction that intersects the winding direction at an arbitrary angle and includes the transverse direction. to be.

A method of manufacturing an electrode assembly for a secondary battery according to the present invention is a method of manufacturing an electrode assembly for a secondary battery by winding in a jelly roll type by interposing a sheet separator between a sheet type anode and a cathode.

(a) applying an adhesive on the separator in a stripe form extending in a direction crossing the winding direction of the separator;

(b) bonding the adhesive-coated separator with one electrode so that the adhesive application side thereof faces one of the positive and negative electrodes;

(c) forming an emboss on the surface of the separator by passing the assembly of the one electrode and the separator through the guide roller while bending the one electrode to be contacted along the curved surface of the guide roller outer circumference; And

(d) combining the other embossed electrode with the other of the positive electrode and the negative electrode to form a jelly roll in the embossed conjugate.

The sheet type anode, sheet type cathode, sheet type separator used in the present invention may be appropriately selected and used without particular limitation from those known in the art.

Specifically, the positive electrode is prepared by applying a slurry containing a positive electrode active material, a conductive material, a binder, and the like on a positive electrode current collector, followed by drying, the positive electrode active material is a lithium transition metal oxide, and includes two or more transition metals, for example, one or more of the lithium cobalt oxide as the transition metal-substituted (LiCoO _2), lithium nickel oxide (LiNiO ₂₎ layered compound, and the like; Lithium manganese oxide substituted with one or more transition metals; Formula LiNi _1-y MyO ₂ , wherein M = Co, Mn, Al, Cu, Fe, Mg, B, Cr, Zn or Ga and comprises at least one of the above elements, 0.01 ≤ y ≤ ≤ 0.7 Lithium nickel-based oxide represented by; _{Li 1 + z Ni 1/3} Co 1/3 Mn 1/3 O 2, Li 1 + z Ni 0. ₄ Mn _{0 . 4} Co _{0 .} Li ₂ O _2, such as _{1 + z Ni b Mn c Co} 1 - (b + c + d) M d O (2-e) Ae ( here, -0.5≤z≤≤0.5, 0.1≤≤b≤≤0.8 , 0.1≤≤c≤≤0.8, 0≤≤d≤≤0.2, 0≤≤e≤≤0.2, b + c + d <1, M Al, Mg, Cr, Ti, Si or Y, A = Lithium nickel cobalt manganese composite oxide represented by F), P, or Cl; Formula Li _{1 + x} M _{1 - y} M ' _y PO _{4 - z} X _z , wherein M = transition metal, specifically Fe, Mn, Co or Ni, M' = Al, Mg or Ti, X = F , Olivine-based lithium metal phosphate represented by S or N, and -0.5≤≤x≤≤ + 0.5, 0≤≤y≤≤0.5, and 0≤≤z≤≤0.1.

The positive electrode current collector is generally manufactured to a thickness of 3 to 500 μm, and is not particularly limited as long as it has high conductivity without causing chemical change in the battery. For example, stainless steel, aluminum, nickel, titanium, calcined carbon, or a surface treated with carbon, nickel, titanium, silver or the like on the surface of aluminum or stainless steel may be used.

The conductive material is typically added in an amount of 1 to 50% by weight based on the total weight of the mixture including the positive electrode active material. Such a conductive material is not particularly limited as long as it has conductivity without causing chemical change in the battery, and examples thereof include graphite such as natural graphite and artificial graphite; Carbon blacks such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder and nickel powder; Conductive whiskeys such as zinc oxide and potassium titanate; Conductive oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.

The binder is a component that assists in bonding the active material and the conductive material to the current collector, and is generally added in an amount of 1 to 50 wt% based on the total weight of the mixture including the positive electrode active material. Examples of such binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.

In the present invention, the negative electrode is produced by applying a slurry containing a negative electrode active material and the like on a negative electrode current collector and then drying, the negative electrode active material, for example, natural graphite, artificial graphite, expanded graphite, carbon fiber, non-graphite Carbon and graphite materials such as carbonized carbon, carbon black, carbon nanotubes, fullerenes and activated carbon; Metals such as Al, Si, Sn, Ag, Bi, Mg, Zn, In, Ge, Pb, Pd, Pt, Ti which can be alloyed with lithium, and compounds containing these elements; Complexes of metals and compounds thereof with carbon and graphite materials; Lithium-containing nitrides; and the like.

The negative electrode current collector is generally manufactured to a thickness of 3 to 500 μm, and is not particularly limited as long as it has conductivity without causing chemical change in the battery. For example, copper, stainless steel, aluminum, nickel, titanium, calcined carbon, surface treated with carbon, nickel, titanium, silver, or the like on the surface of copper or stainless steel, aluminum-cadmium alloy, and the like can be used.

Separation membrane in the present invention may be used without particular limitation the polymer porous separator commonly used in the art, for example, polyolefin-based polymer porous separator; Or polyethylene terephthalate, polybutylene terephthalate, polyester, polyacetal, polyamide, polycarbonate, polyimide, polyether ether ketone, polyether sulfone, polyphenylene oxide, polyphenylene sulfite, polyethylene naphthalene And porous separators formed of any one or a mixture of two or more selected from. In the present invention, the polyolefin-based polymer porous separator, more specifically, polyolefin-based polymers such as polyethylene, polypropylene, polybutylene, polypentene, such as high density polyethylene, linear low density polyethylene, low density polyethylene, ultra high molecular weight polyethylene, alone or A membrane or nonwoven fabric formed by mixing them can be preferably used.

In the present invention, the electrode assembly is manufactured using the positive electrode, the negative electrode, the separator, and the like as exemplarily described above. First, an adhesive is applied on the sheet-type separator in the form of a stripe (step (a)). In the stripe form to which the adhesive 41 is applied, each stripe extends in a direction intersecting at an angle with a winding direction L in which the separator 40 'is wound, preferably at an angle. Extends in the transverse direction W perpendicular to the winding direction. Also, the spacing G between the stripes may not be constant, but is preferably constant, and the spacing may be preferably 1 to 10 mm. If the spacing of the stripe is too close to less than 1mm, the coated surface of the adhesive may be widened more than necessary, which may cause deterioration of the battery performance. If the stripe is too wide beyond 10mm, the adhesion between the separator and the electrode is not good and the embossing Can be difficult to form. In addition, the width of the stripe may be appropriately selected in consideration of the stripe gap, the adhesive strength of the adhesive, and the kind of the separation membrane.

The adhesive in the step (a) of the present invention can be used appropriately selected from conventional ones known in the art, for example, a composition including a good adhesive acrylic adhesive, urethane-based adhesive, thermoplastic elastomer and the like can be used. It is not limited to this. In the present invention, a polyethylene porous separator can be preferably used as the separator. In this case, it is preferable that the adhesive exhibits adhesive force when heat of 135 degrees or less is applied.

After performing step (a), the adhesive-coated separator is bonded with one of the positive electrode and the negative electrode (step (b)). At this time, the adhesive coating surface of the separator is bonded so as to face the one electrode, the bonding is not necessary to perform a special operation such as pressing, it is sufficient to combine so as to face the separator and the electrode. Here, the electrode to be bonded to the adhesive-coated separator is preferably a cathode of the positive electrode and the negative electrode. This is because, as compared with the positive electrode, the negative electrode is excellent in bending property and easily adheres to the roller.

Subsequently, in step (b), the adhesive-coated separator and the one electrode (hereinafter, abbreviated as 'conjugate') are bonded to each other through a guide roller to form an emboss on the surface of the separator. Step (c)). Preferred embodiments of step (c) are schematically illustrated in Figs. 5A to 5D, and step (c) will be described with reference to these figures.

In step (c), the assembly is not passed through the guide roller 50 in a straight line, but is curved along the curved surface of the outer periphery of the guide roller 50, and the electrode side surface of both surfaces of the assembly (Fig. 5, the cathode 20 'side faces the outer circumferential surface of the guide roller 50 (i.e., the membrane 40' side of both surfaces of the bonded body faces the outside of the roller 50). It is characterized by passing through the roller 50.

The bending angle θ, which curves the bonded body in the curved shape in the guide roller 50, can be appropriately adjusted according to the height (protrusion degree) of the embossing to be formed, preferably 30 degrees to 180 degrees, more preferably. Preferably it can be in the range of 60 to 120 degrees. 5A to 5D show the cases where the bending angle θ is set to 90 degrees, 60 degrees, 120 and 90 degrees, respectively.

In addition, in step (c), the separator is further provided with a pressure roller 51 facing the guide roller 50 with the bonded body therebetween to press the bonded body passing while contacting the guide roller 50, thereby separating the separation membrane ( 40 ') and the electrode can be more firmly adhered to the adhesive coated portion, which is preferable. 5D shows a preferred embodiment in which the pressure roller 51 is further provided. The pressure roller 51 may be any one capable of appropriately pressing the bonded body passing through the outer circumferential surface of the guide roller 50, and is not particularly limited.

In addition, by passing the assembly in a state in which the guide roller 50 and / or the pressure roller 51 is heated to a predetermined temperature, the adhesive applied in a stripe form onto the separator melts the separator and the electrode. In addition, the membrane of the polymer material is preferred because it can be naturally stretched. At this time, the temperature of the pressure roller 51 can be appropriately adjusted to a temperature such that the shrinkage does not occur according to the material of the separator, when the separator is made of polyethylene, for example, 135 ℃ or less, preferably 50 ℃ to 130 ℃ It is preferable from the standpoint of adhesiveness and stretchability if it is heated.

Thus, when the bonding body passes through the guide roller 50, the difference in curvature between the inner electrode facing the guide roller 50 and the outer separation membrane (in other words, the difference in the circumferential distance passing through the circumferential outer circumferential surface of the guide roller) Since the separation membrane is relatively softer than the electrode, the separation membrane is stretched to the outer side of the separation membrane, and the thus-separated separation membrane is straightened again after passing through the guide roller, and the adhesive is not applied. In the state of being lifted up, an embossed separation membrane having a wavy structure or wrinkles is formed.

Fig. 6 is an enlarged cross-sectional view showing a cross section of the winding direction in which the embossed assembly is formed. The electrode (cathode 20 'in the drawing) and the separator 40' are adhered to the coated portion of the adhesive 41, The outer portion shows that the separation membrane 40 'is in an excited state to form a protruding emboss.

In the step (c), when the separator is embossed, the electrode assembly is manufactured by winding together with the other electrode of the positive electrode and the negative electrode in a jelly roll shape (step (d)). Here, the method of winding in a jelly roll type may be appropriately selected and used among those known in the art, and thus a detailed description thereof will be omitted.

FIG. 7 schematically illustrates a horizontal cross section of a jellyroll electrode assembly manufactured according to the present invention, wherein an embossed separator 40 'is interposed between the cathode 20' and the anode 30 '. It can be seen that voids are formed between the electrodes. By the voids, stress generated by the expansion of the electrode during charging and discharging of the battery is alleviated, so that phenomena such as bending of the electrode and detachment of the active material can be prevented, thereby ultimately preventing the performance of the battery. .

In addition, the present invention provides a secondary battery, wherein the secondary battery of the present invention comprises an electrode assembly and a battery case containing the electrode assembly, wherein the electrode assembly is manufactured by the manufacturing method of the present invention Characterized in that the electrode assembly for a secondary battery. Here, the battery case, the specific configuration of the secondary battery, a manufacturing method, etc. may be used as appropriately selected from those known in the art, detailed description thereof will be omitted.

While the present invention has been described in detail with reference to specific embodiments and examples, modifications to various other forms, replacement of materials, etc., changes in dimensions, and additional components without departing from the scope of the present invention based on these details. It will be apparent to those skilled in the art that additions and the like can be made.

10a and 10b: electrode assembly
11: bend
12: waveform structure
20, 20b, 20 ': cathode
30, 30b, 30 ': anode
40, 40b, 40 ': separator
40b-1: flat part
40b-2: embossing part
41: adhesive
50: guide roller
51: pressure roller
G: thickness
θ: bending angle

Claims (15)

A method of manufacturing an electrode assembly for a secondary battery by winding a jelly roll in between a sheet-shaped anode and a cathode through a sheet-type separator,
(a) applying an adhesive on the separator in the form of a stripe extending in a direction crossing the winding direction of the separator;
(b) bonding the adhesive-coated separator so that the adhesive application side thereof faces one of the positive and negative electrodes;
(c) passing the assembly of the one electrode and the separation membrane through the guide roller while bending the one electrode to be contacted along the curved surface of the guide roller outer circumference to form an emboss on the surface of the separation membrane; And
(d) winding the embossed conjugate in a jellyroll form by combining with the other electrode of the positive electrode and the negative electrode;
Method for producing a secondary battery electrode assembly comprising a.
The method of claim 1,
The separator is a method of manufacturing an electrode assembly for a secondary battery, characterized in that the polyolefin-based polymer porous separator.
The method of claim 2,
The polyolefin-based polymer is a manufacturing method of the electrode assembly for secondary batteries, characterized in that the polyethylene.
The method of claim 1,
In the stripe form, each stripe is a method of manufacturing an electrode assembly for a secondary battery, characterized in that extending in the direction crossing the winding direction of the separator.
The method of claim 4, wherein
In the stripe form, each stripe is a method of manufacturing a secondary battery electrode assembly, characterized in that extending in the transverse direction perpendicular to the winding direction of the separator.
The method of claim 1,
In the stripe form, the spacing between each stripe is a manufacturing method of the electrode assembly for secondary batteries, characterized in that 1 to 10mm.
The method of claim 1,
The adhesive is a method of manufacturing an electrode assembly for a secondary battery, characterized in that the adhesive to exhibit an adhesive force when applying heat of 135 degrees or less.
The method of claim 1,
Method of manufacturing an electrode assembly for a secondary battery, characterized in that any one of the electrodes in the step (b).
The method of claim 1,
Method of manufacturing an electrode assembly for a secondary battery, characterized in that for bending the assembly at an angle of 30 to 180 degrees in step (c).
The method of claim 10,
Method of manufacturing an electrode assembly for a secondary battery, characterized in that for bending the assembly at an angle of 60 to 120 degrees in step (c).
The method of claim 1,
A method of manufacturing an electrode assembly for a secondary battery, characterized by further comprising a pressure roller facing the guide roller with the assembly interposed therebetween.
The method of claim 1,
Method of manufacturing an electrode assembly for a secondary battery, characterized in that for heating the guide roller in step (c).
The method of claim 12,
The method of manufacturing an electrode assembly for a secondary battery, characterized in that for heating the guide roller at a temperature of 135 ℃ or less in step (c).
The electrode assembly for secondary batteries manufactured by the manufacturing method in any one of Claims 1-13.
In the secondary battery comprising an electrode assembly and a battery case containing the electrode assembly,
Secondary battery, characterized in that the electrode assembly is a secondary battery electrode assembly according to claim 14.

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