KR101625602B1 - Method for manufacturing secondary battery using transferring - Google Patents

Abstract

The present invention relates to a manufacturing method of a secondary battery using a transfer coating method and, more specifically, to a manufacturing method of a secondary battery using a transfer coating method, which increases interfacial adhesion between an electrode and a separation membrane, can reduce processing time by simplifying a manufacturing process, and can minimize defects of the manufactured secondary battery. A negative electrode, a positive electrode, and a separation membrane are laminated by transferring an adhesive pattern layer having a fixed pattern and an adhesive layer in the state in which a solvent is previously removed.

Description

TECHNICAL FIELD The present invention relates to a continuous secondary battery manufacturing method using a transfer coating method,

More particularly, the present invention relates to a method of manufacturing a secondary battery using a transfer coating method, and more particularly, to a method of manufacturing a secondary battery using a transfer coating method, The present invention also relates to a method of manufacturing a secondary battery using the transfer coating method, which can minimize the defects of the manufactured secondary battery.

In recent years, compact and lightweight electric / electronic devices such as mobile phones, notebook computers, and camcorders have been actively developed and produced. These portable electric / electronic devices have built-in battery packs so that they can be operated even in a place where no separate power source is provided. The built-in battery pack has at least one battery therein so as to output a voltage of a certain level to drive the portable electric / electronic device for a predetermined period of time.

In consideration of economical aspects, the battery pack employs a secondary battery capable of charging / discharging. Typical examples of the secondary battery include a nickel-cadmium (Ni-Cd) battery, a nickel-hydrogen (Ni-MH) battery, and a lithium secondary battery such as a lithium battery and a lithium ion battery.

The secondary battery includes an electrode assembly having a positive electrode, a negative electrode, and a separator. The electrode assembly includes a jelly-roll type in which an anode and a cathode are roundly wound with a separator interposed therebetween, a cathode, A unit cell composed of an anode, a cathode and a separator as a mixed type thereof is formed into a folded film (for example, a separator) by using a long sheet-like continuous folding film / Stacked-stacked-type (stackfolding type) lithium secondary batteries.

Japanese Unexamined Patent Publication No. 1998-275628 ("Method of Manufacturing Battery") has been disclosed in the related art. The prior art discloses a method for manufacturing a secondary battery by applying an adhesive to the upper and lower surfaces of a cathode to adhere the separating film in advance and then laminating the positive electrode.

However, in the prior art, the solvent is removed by heating in the process of transferring the separator after the application of the adhesive, but if the heating time is not sufficient, the unremoved solvent is present, There arise problems such as dissolving the separator material or oxidizing the electrode active material. In addition, if the heating time is increased to remove the solvent, the overall process time will be long, resulting in low productivity and a high probability of failure due to particles or the like.

Another problem that occurs in the conventional secondary battery design is that as shown in FIG. 1, when a laminate of an anode, a cathode, and a separator is wound, a thickness variation occurs and resistance is concentrated on a specific part, This is big. In particular, there is a disadvantage that physical defects as described above are amplified due to occurrence of gaps or twists in winding at a high speed, which means that it is not desirable from the viewpoints of battery reliability and safety.

JP 1998-275628 A (Oct. 13, 1998)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a positive electrode, a negative electrode, and a separator, which can simplify a manufacturing process to increase productivity, And to provide a method for manufacturing a secondary battery using a transfer coating method in which the occurrence rate of defects such as twisting during winding of the stacked laminate is very small.

The present invention relates to a method of manufacturing a lithium secondary battery in which an anode, a cathode, and a separator are drawn from respective rolls and laminated with each other, wherein a cathode, a cathode, and a separator are drawn from respective rolls and laminated to each other to manufacture a lithium secondary battery A) transporting a positive electrode plate, a negative electrode plate and a separating membrane from respective rolls; b) an adhesive layer or a patterned adhesive pattern layer having a surface-coated adhesive binder on the release film is transferred to the surface of the positive electrode plate, the negative electrode plate or the separation membrane, and the release film is separated and removed; And c) forming a laminated body in which the separator is interposed between the positive electrode plate and the negative electrode plate.

In addition, in the step c), the positive electrode plate, the negative electrode plate and the two separation membranes are continuously drawn in between the pair of compression rollers to form a four-layer structure laminated in the order of the positive electrode plate-separator-negative plate- separator or negative plate- separator- And a step d) of forming the electrode structure by winding the laminate 50 after the step c).

In addition, in the step c), the positive electrode plate, the negative electrode plate and the separator are continuously drawn between the pair of compression rollers to form a laminate having a three-layer structure in the order of the positive electrode plate-separator-negative electrode plate, and the laminate after the step c) And e) fabricating a folded electrode structure in a zigzag fashion.

In addition, the adhesive pattern layer may be formed by: 1) coating a binder solution on a release film in a predetermined pattern; 2) drying and / or curing the binder solution for a predetermined time to form a pressure-sensitive adhesive pattern layer with the solvent of the binder solution removed; And 3) winding the release film so that the adhesive pattern layer faces inward.

Alternatively, the adhesive pattern layer may be formed by 1) coating a binder solution on a release film in a predetermined pattern; 2) drying and / or curing the binder solution for a predetermined time to form a pressure-sensitive adhesive pattern layer with the solvent of the binder solution removed; And 3) a step of pressing an additional release film on the adhesive pattern layer, wherein one release film is removed from at least one side of the positive electrode plate, the negative electrode plate or the separation membrane transferred in the step b) The pattern layer is transferred, and the remaining release film can be removed immediately before the positive electrode plate, the negative electrode plate and the two separation membranes are drawn into the pair of compression rollers.

In the step 1), a masking film is disposed on a release film, and a binder solution is coated thereon using any one of coaters selected from a spray coater, a roll coater and a bar coater, and then the masking film is removed, The binder solution may be patterned or directly patterned by a gravure coater and an inkjet printing method.

The present invention relates to a method for manufacturing a high capacity battery by stacking an anode, a cathode, and a separator using a pressure sensitive adhesive pattern layer having a predetermined pattern, The risk of occurrence of a short circuit or an explosion is significantly reduced and the probability of occurrence of a physical defect in the bent portion at the time of winding is reduced, There is little defect caused by defects (gap generation, thickness deviation, skewing, etc.) as shown in FIG. Also, due to the adhesion between the electrode and the separator, the interfacial resistance between these interfaces is reduced, thereby providing excellent electrochemical stability.

In addition, since there is no residual solvent, there is no problem in that when the electrode structure is packed with the secondary battery, there is no problem such as an increase in the internal pressure, oxidation of the electrode active material and dissolution of the binder or separator material.

In addition, the process of drying the solvent after the application of the adhesive is omitted, and the secondary battery is continuously produced through a relatively simple process of pulling each layer at one time to form a laminate, which is advantageous in productivity.

FIG. 1 is a view showing a problem that occurs when a laminated body is wound in a conventional method for manufacturing a secondary battery.
2 is a schematic process diagram of a method for manufacturing a continuous secondary battery according to an embodiment of the present invention.
3 is an exploded perspective view of a laminate according to an embodiment of the present invention.
4 is a cross-sectional view of the laminate of Fig. 3;
5 and 6 are schematic process drawings of a method for manufacturing a continuous secondary battery according to another embodiment of the present invention.
7 illustrates a transfer process of an adhesive layer or an adhesive pattern layer according to an embodiment of the present invention.
8 is a view illustrating a process of transferring an adhesive layer or an adhesive pattern layer according to another embodiment of the present invention.
9 is a schematic cross-sectional view illustrating a process of manufacturing an adhesive pattern layer according to an embodiment of the present invention.
10 illustrates a process of forming an electrode tab in an electrode structure according to an embodiment of the present invention.
11 is a plan view illustrating a process of forming a positive electrode tab and a negative electrode tab according to another embodiment of the present invention.
12 illustrates an electrode structure according to another embodiment of the present invention.

Hereinafter, the technical idea of the present invention will be described more specifically with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the technical concept of the present invention, are incorporated in and constitute a part of the specification, and are not intended to limit the scope of the present invention.

The present invention relates to a method for producing a lithium secondary battery in which an anode, a cathode and a separator are drawn from respective rolls and laminated with each other, B) a step b) of separating and removing the release film, wherein the adhesive layer or the patterned adhesive pattern layer coated with the adhesive binder is transferred onto the surface of the positive electrode plate or the negative electrode plate or the separation membrane, And c) forming an interposed laminated laminate.

FIG. 2 illustrates a schematic process of a method for manufacturing a continuous secondary battery according to an embodiment of the present invention.

As shown in the figure, in step a), the positive electrode plate 10, the negative electrode plate 20 and the two separators 30 are transferred from the respective rolls 10a, 20a and 30a. The adhesive layer 40a or the patterned adhesive pattern layer 40 coated with the adhesive binder on the release film 41 is transferred to the positive electrode plate 10 or the negative electrode plate 20 in the process of transferring each plate in the step b) Or the separation film 30, and the release film 41 is removed. At this time, the pressure sensitive adhesive layer 40a or the pressure sensitive adhesive pattern layer (or the pressure sensitive adhesive layer) is formed so that the positive electrode plate 10, the separator 30, the negative electrode plate 20 and the separator 30 (or the negative electrode plate- 40 are interposed between the respective layers to serve as an adhesive layer. The adhesive layer 40a or the adhesive pattern layer 40 may be transferred to the lower surface of the positive electrode plate 10 and both surfaces of the negative electrode plate 20 as shown in the figure, Of course.

Thereafter, in step c), the positive electrode plate-separator-negative electrode plate-separator (or the negative electrode plate-separator-positive electrode plate-separator) are simultaneously drawn into and stacked on the pair of pressing rollers 1, A layered structure 50 is formed.

3 is an exploded perspective view (the thickness (height) of the adhesive pattern layer in the drawing is actually very thin) of the laminate 50 according to the embodiment of the present invention, and Fig. 4 is a sectional view of the laminate 50 of Fig. Sectional view of the laminate 50 produced in the step c) cut in the width direction. As described above, the positive electrode plate 10, the separator 30, the negative electrode plate 20, and the separator 30 are stacked side by side by a pair of pressing rollers 1, and an adhesive pattern layer 40 Lt; / RTI > The layered product 50 can be formed by pressing with the pressing roller 1 and can also be heat-pressed upon pressing. This has the advantage that the adhesive layer 40 is thermally relaxed, and adhesion is further facilitated. At this time, the temperature may be 30 to 100 ° C and may be increased to a range of 1 to 30 kgf / cm ² , but the present invention is not limited thereto.

After the step c), the laminated body 50 drawn out between the pressing rollers 1 and conveyed along the conveying line is wound around the end of the conveying line in an elliptical or circular column shape using a device such as a mandrel the step d) is performed in which the electrode structure 60 is manufactured by winding.

The positive electrode plate 10, the negative electrode plate 20 and the separator 30 are supplied from the respective rolls 10a, 20a and 30a and the pressure sensitive adhesive layer or the pressure sensitive adhesive layer 40 is transferred to the pressure roller 1, The laminated body 50 is formed by passing through the electrode assembly 60. The stacked body 50 is continuously cut and rewound when the laminated body 50 is wound a predetermined number of times, .

Thereafter, the electrode tabs 11 and 21 of the electrode structure 60 are connected to the electrode lead terminals 70 and 80, the electrode structure 60 is sealed in the case, the electrolyte is injected and finally sealed and packed, A battery is manufactured (the process after forming the electrode structure is a well-known technique, so a detailed description is omitted).

5 and 6 are schematic process diagrams of a method for manufacturing a continuous secondary battery according to another embodiment of the present invention.

In the illustrated embodiment, steps a) and b) are similar to the embodiment shown in Fig. 2 and therefore will be briefly described. the positive electrode plate 10, the negative electrode plate 20 and the separator 30 are transferred from the respective rolls 10a, 20a and 30a in the step a), and the adhesive layer 40a or the adhesion pattern layer 40 The negative electrode plate 20, and the separator 30 so as to be interposed between the respective layers.

Thereafter, in the step c), the positive electrode plate 10, the negative electrode plate 20 and the separator 30 are continuously drawn between the pair of compression rollers 1 to form a three-layer laminated structure in which the positive electrode plate-separator- (50) is formed.

After step c), the stacked body 50 of the three-layer structure drawn out between the compression rollers is folded in a zigzag shape as the plate S is moved to the right and left to produce a stacked electrode structure 60 (step e) .

The above structure is also cut when the stacked body 50 is stacked a predetermined number of times to continuously produce the electrode structure 60, and a description of the process of making the electrode structure 60 as a secondary battery is omitted.

As described above, the pressure-sensitive adhesive layer 40a or the pressure-sensitive adhesive pattern layer 40 of the present invention is a pressure-sensitive adhesive layer in a state in which the solvent is already removed, unlike the conventional pressure-sensitive adhesive layer 40a. Layer 40a or an adhesive pattern layer 40 formed by patterning on the release film 41 such that the adhesive binder forms a predetermined pattern.

In this case, since there is no residual solvent, there is no problem that the electrode structure is packed with the secondary battery, such as an increase in the internal pressure, oxidation of the electrode active material, and dissolution of the binder or separator material.

In addition, the process of drying the solvent after the application of the adhesive is omitted, and the secondary battery is continuously produced through a relatively simple process of drawing the layers one at a time to form the layered product 50, which is advantageous in productivity.

In addition, when the adhesive pattern layer 40, which is a patterned adhesive agent, is used to bond the separator 30 to the electrode, when the laminate is wound several times in order to manufacture a high capacity battery, no variation in thickness occurs, (The occurrence of gaps, thickness variations, misalignments, etc.) as shown in FIG. 1 even at high speed winding, and the possibility of occurrence of defects And there is an advantage that the yield is increased.

7 and 8 are two examples showing the transfer process of the adhesive pattern layer 40 of the present invention. For reference, the adhesive layer can also be transferred through the same process.

First, as shown in Fig. 7, the roll-shaped adhesive pattern layer 40 is transferred to the electrode plates 10 and 20 (or the separation membrane 30) while being unwinded, and the release film 41 can be removed . At this time, the applied adhesive pattern layer 40 is formed through the following process. The binder solution (B) is coated on the release film (41) in a predetermined pattern and dried and / or cured for a predetermined time to remove the solvent of the binder solution (B) Is formed. Thereafter, the release film 41 is wound in a roll shape so that the adhesive pattern layer 40 faces inward.

As another example, the adhesive pattern layer 40 may be formed such that the binder solution B is coated on the release film 41 in a predetermined pattern and dried and / or cured for a predetermined time to form the adhesive pattern layer 40, An additional release film 41 may be pressed and formed on the adhesive pattern layer 40.

8, one release film 41 is removed from at least one side of the positive electrode plate 10, the negative electrode plate 20, or the separation membrane 30 to be transferred, so that the adhesion pattern layer 40 The remaining release film 41 is removed just before the positive electrode plate 10, the negative electrode plate 20 and the two separation membranes 30 are pulled into the pair of compression rollers 1 desirable.

On the other hand, the binder solution (B) may be prepared in the form of a mixture of a binder resin and a solvent and an additive in which a binder resin is dispersed in an organic solvent. Preferably, the binder resin may be included in a ratio of about 1 to about 30 parts by weight, preferably about 3 to about 20 parts by weight, relative to 100 parts by weight of the total amount of the binder solution (B), and the additive is added in an amount of about 0.1 to about 10 parts by weight Is from about 0.1 to about 5 parts by weight.

Examples of the binder resin include polyvinylidene fluoride (PVdF) resin, polyvinylidene fluoride- co- hexafluoropropylene (PVdF- co- HFP), styrene-butadiene rubber (SBR, styrene-butadiene rubber, styrene-butadiene-styrene (SEBS), styrene-ethylene-butylene-styrene (SEBS), polytetrafluoroethylene Polytetrafluoroethylene (PTFE), polyethylene glycol (PEG), polypropylene glycol (PPG), toluene diisocyanate (TDI), polymethylmethacrylate, polyacrylonitrile ), Polyvinylpyrrolidone, polyvinylacetate, polyethylene-co-vinyl acetate, But are not limited to, polyethylene oxide, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cyanoethylpullulan, cyanoethylpolyvinyl alcohol but are not limited to, cyanoethylpolyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxyl methyl cellulose, and acrylonitrile-styrene-butadiene copolymer a copolymer, and the like, but is not limited thereto.

Conventionally, a solvent having a low volatility and a high boiling point has been difficult to be used by applying a binder resin mixed with an organic solvent to a separator or electrode and removing the solvent by applying heat for a predetermined period of time. On the other hand, in the case of the present invention, since the binder solvent is not applied to the separator or the electrode but is formed on the release film 41 and transferred to the separator 30 or the electrodes 10 and 20 with all the solvent removed, Solvents with low and high boiling points can be used, and there is no problem due to unremoved solvents.

The binder solution (B) preferably has a viscosity of 10 to 1000 cps, but is not limited thereto. The viscosity of the binder solution (B) is determined according to the content of the binder resin having a tackiness. When the binder solution (B) is coated by patterning using the inkjet printer, dispenser or nozzle, It is possible to maintain the pattern without spreading over a certain amount, and it is not excessively sticky so that proper workability can be secured.

In addition, since the height of the binder solution (B) decreases as the solvent is removed in the subsequent drying and / or curing step, the height of the adhesive pattern layer 40 from which the solvent is ultimately removed is in the range of 0.1 탆 to 5 탆 It is preferable to coat the release film 41 at an appropriate height so that the release film 41 is formed. However, the present invention is not limited thereto. That is, the coating height of the binder solution (B) is determined according to the viscosity of the binder solution (B), the content of the solvent and the like.

The drying time and temperature of the binder solution (B) after coating can be adjusted according to the boiling point of the solvent, the coating height, and the like. In one example, drying is performed at a temperature of 50 ° C to 200 ° C or more for 1 minute to 3 minutes, and curing may be performed at a temperature of 40 to 60 ° C for 5 minutes to 24 hours.

For reference, it is preferable that the release film is a film-like member which is heat-treated so as to easily transfer the adhesive member to another member after the adhesive member is adhered to the surface and is not affected even during heating and curing. The release film 41 may be a polyethylene terephthalate film, a polytetrafluoroethylene film, a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a polyvinyl chloride film, a polyurethane film, an ethylene- An ethylene-ethyl acrylate copolymer film, an ethylene-methyl acrylate copolymer film, or a polyimide film may be used. Examples of the releasing agent used in the releasing treatment of the releasing film include alkyd type, silicone type, Fluorine-based, unsaturated ester-based, polyolefin-based or wax-based ones can be used. Among them, alkyd-based, silicone-based or fluorine-based releasing agents are preferably used from the viewpoint of heat resistance.

9 is a schematic cross-sectional view illustrating a process of manufacturing the adhesive pattern layer 40 according to an embodiment of the present invention. As shown in FIG. 9, the adhesive pattern layer 40 includes a masking film 2 on a release film 41, And the binder solution B is coated thereon by using any one of coaters (not shown) selected from a spray coater, a roll coater and a bar coater and then the masking film 2 is removed to remove the release film 41, And the binder solution (B) is patterned and coated on the substrate. Alternatively, the adhesion pattern layer 40 may be formed by directly applying a pattern on the release film without using a masking film by using a coating method such as gravure coater and inkjet printing.

When the masking film is used, the adhesion pattern layer 40 can be formed at a very uniform height by aligning the thickness of the masking film 2 with the coating solution height of the binder solution (B). In addition, the masking film 2 can be removed after the drying and / or curing steps. In this case, the viscosity of the binder solution (B) is not ensured, which is advantageous in workability. However, it is needless to say that the adhesive pattern layer 40 may be printed directly using an inkjet printer, a dispenser or a nozzle as described above.

In addition, the pattern of the adhesive pattern layer 40 may be variously formed, and may be formed in a repeated pattern such as a dot, a grid, a circle, or a stripe, . At this time, it is preferable that the adhesive pattern layer is formed in a range of 5% to 80% of the surface area of the separation membrane. If the area of the adhesive pattern layer is 5% or less, the adhesive force between the separation membrane and the electrode is deteriorated. If the area exceeds 80%, the porosity of the separation membrane may be deteriorated.

In the embodiment of the present invention, the width of the anode plate 20 and the width of the cathode plate 10 are longer than the width of the separator 30, The positive electrode plate 10 protrudes on one side of the separation membrane 30 on a cross section orthogonal to the transport direction and the negative electrode plate 20 protrudes on the other side. At this time, the overall width of the positive electrode plate 10 and the negative electrode plate 20 in the width direction is longer than that of the separator 30, but the surface of the positive electrode plate 10 and the negative electrode plate 20 coated with the active material is covered by the separator 30 .

10, after the electrode structure 60 is formed by winding the stacked body 50 (step d) and folding it (step e), an electrode structure 60 is formed on one end of the electrode structure 60 in the axial direction The negative electrode plate 20 is punched to form the negative electrode tab 21 and the positive electrode plate 10 protruded to the other end is punched to form the positive electrode tab 11. That is, in step c), the laminate 50 is formed such that the cathode plate 10 and the cathode plate 20 protrude from both sides of the axial direction of the electrode structure 60, The positive electrode tab 11 and the negative electrode tab 21 can be formed by punching.

Finally, the secondary battery is completed through a subsequent process such as joining the positive electrode lead terminal 70 and the negative electrode lead terminal 70 to the positive electrode tab 11 and the negative electrode tab 21, respectively.

The positive electrode tab 11 and the negative electrode tab 21 are formed so as to face one direction but are spaced apart from each other by a predetermined distance . This will be briefly described with reference to FIGS. 11 and 12. FIG. FIG. 11 is a plan view illustrating a process of forming a positive electrode tab 11 and a negative electrode tab 21 according to another embodiment of the present invention, and FIG. 12 is a view showing an electrode structure 60 according to another embodiment of the present invention.

11, the positive electrode tab 11 and the negative electrode tab 20 are provided on one side end and / or the other side end of the positive electrode plate 10 and the negative electrode plate 20, which are transferred after the step a) 1) step of punching the punching tool (the punching tool P of Fig. 2) is added. In this case, the width of the positive electrode plate 10 and the negative electrode plate 20 is longer than the width of the separator 30 by a predetermined length, and the positive electrode tab 11 and the negative electrode tab 21 are formed on the positive electrode plate 10 and the negative electrode plate 20, Is punched to protrude to one side of the separator 30 and is formed to be offset from each other so that the positive electrode tab 11 and the negative electrode tab 21 do not overlap.

The plurality of positive electrode tabs 11 and the plurality of positive electrode tabs 11 are formed at the time of winding the stacked body 50 in the step d) And the negative electrode tabs 21 are laminated in parallel to each other. 12, the positive electrode tab 11 and the negative electrode tab 21 are formed on one side with respect to the axial direction of the electrode structure 60. In consideration of the increasing volume during winding, each of the electrode tabs 11 , 21) can be stacked in parallel.

5 and 6, when the electrode tabs 11 and 21 are formed at the same interval as the stacked body 50 is folded in a zigzag manner, the plurality of positive electrode tabs 11 and the negative electrode tabs Tabs 21 will be stacked in parallel, respectively.

Thereafter, similarly, each of the electrode tabs 11 and 21 is bonded to the lead terminals 70 and 80, and packed in a case (not shown).

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

B: Binder solution P: Punching machine
C: Cutter F: Separation film
1: Compression roller 2: Masking film
10: Positive electrode plate 10a: Positive electrode plate roll
11: positive electrode tab
20: cathode plate 20a: anode plate roll
21: Negative electrode tab
30: Separation membrane 30a: Separation membrane roll
40: Adhesion pattern layer 40a: Adhesive layer
41: release film
50: laminated body 51: unit cell
60: Electrode Structure
70: Positive lead terminal
80: Negative lead terminal

Claims (7)

A method for producing a lithium secondary battery in which an anode, a cathode, and a separator are drawn from respective rolls and laminated to each other,
a) a positive electrode plate, a negative electrode plate and a separator are fed from respective rolls;
b) an adhesive layer or a patterned adhesive pattern layer having a surface-coated adhesive binder on the release film is transferred to the surface of the positive electrode plate, the negative electrode plate or the separation membrane, and the release film is separated and removed; And
c) forming a laminated body in which the separator is interposed between the positive electrode plate and the negative electrode plate;
And,
Wherein the adhesive pattern layer comprises
1) coating a binder solution on a release film in a predetermined pattern;
2) drying and / or curing the binder solution for a predetermined time to form a pressure-sensitive adhesive pattern layer with the solvent of the binder solution removed; And
3) winding the release film so that the adhesive pattern layer faces inward;
≪ / RTI > wherein the method comprises preparing a continuous secondary cell using the transfer coating method.
A method for producing a lithium secondary battery in which an anode, a cathode, and a separator are drawn from respective rolls and laminated to each other,
a) a positive electrode plate, a negative electrode plate and a separator are fed from respective rolls;
b) an adhesive layer or a patterned adhesive pattern layer having a surface-coated adhesive binder on the release film is transferred to the surface of the positive electrode plate, the negative electrode plate or the separation membrane, and the release film is separated and removed; And
c) forming a laminated body in which the separator is interposed between the positive electrode plate and the negative electrode plate;
And,
Wherein the adhesive pattern layer comprises
1) coating a binder solution on a release film in a predetermined pattern;
2) drying and / or curing the binder solution for a predetermined time to form a pressure-sensitive adhesive pattern layer with the solvent of the binder solution removed; And
3) pressing an additional release film on the adhesive pattern layer;
, ≪ / RTI >
The step b)
The adhesive pattern layer is transferred while at least one release film is removed from at least one side of the positive electrode plate, the negative electrode plate or the separation membrane to be transferred, and the remaining release film is directly transferred to the positive electrode plate, the negative electrode plate and the two separation membranes Of the total weight of the secondary battery.
3. The method according to claim 1 or 2,
In the step c), the positive electrode plate, the negative electrode plate and the separator are continuously drawn between the pair of compression rollers to form a laminate having a three-layer structure in which the positive electrode plate-separator-
After step c)
e) fabricating an electrode structure in which the laminate is folded in a zigzag form;
The method comprising the steps of: preparing a continuous secondary battery using the transfer coating method.
3. The method according to claim 1 or 2,
In the step c), the positive electrode plate, the negative electrode plate, and the two separator layers are continuously drawn between the pair of compression rollers to form a four-layer stacked structure in which the positive electrode plate- separator- negative electrode plate- separator or negative electrode plate- separator- Lt; / RTI &
After step c)
d) winding the laminate (50) to produce an electrode structure;
The method comprising the steps of: preparing a continuous secondary battery using the transfer coating method.
delete 3. The method according to claim 1 or 2,
The step (1)
A masking film is disposed on a release film, and a binder solution is coated thereon using any one of a coater selected from among a spray coater, a roll coater and a bar coater, and then the masking film is removed, whereby the binder solution is patterned Or by direct patterning by a gravure coater and an inkjet printing method.
A secondary battery produced by the method for manufacturing a secondary battery according to claim 1 or 2.

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