WO2021194282A1 - 단위 셀 제조 장치 및 방법 - Google Patents
단위 셀 제조 장치 및 방법 Download PDFInfo
- Publication number
- WO2021194282A1 WO2021194282A1 PCT/KR2021/003723 KR2021003723W WO2021194282A1 WO 2021194282 A1 WO2021194282 A1 WO 2021194282A1 KR 2021003723 W KR2021003723 W KR 2021003723W WO 2021194282 A1 WO2021194282 A1 WO 2021194282A1
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- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- adhesive
- laminate
- unit cell
- separator
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims description 56
- 239000000853 adhesive Substances 0.000 claims abstract description 164
- 230000001070 adhesive effect Effects 0.000 claims abstract description 164
- 239000011247 coating layer Substances 0.000 claims description 47
- 238000010030 laminating Methods 0.000 claims description 41
- 239000010410 layer Substances 0.000 claims description 32
- 239000011230 binding agent Substances 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 17
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- 238000003825 pressing Methods 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 6
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
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- 239000003792 electrolyte Substances 0.000 description 2
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- 229910001416 lithium ion Inorganic materials 0.000 description 2
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- 150000001336 alkenes Chemical class 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
- H01M50/461—Separators, membranes or diaphragms characterised by their combination with electrodes with adhesive layers between electrodes and separators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to an apparatus and method for manufacturing a unit cell, and more particularly, to a unit cell manufacturing capable of preventing the position of the upper electrode from being deviated when the upper electrode is stacked on a stack formed by stacking a central electrode and a separator. It relates to an apparatus and method.
- types of secondary batteries include a nickel cadmium battery, a nickel hydrogen battery, a lithium ion battery, and a lithium ion polymer battery.
- These secondary batteries are not only small products such as digital cameras, P-DVDs, MP3Ps, mobile phones, PDAs, Portable Game Devices, Power Tools and E-bikes, but also large products requiring high output such as electric and hybrid vehicles and surplus power generation. It is also applied and used in power storage devices that store power or renewable energy and power storage devices for backup.
- an electrode active material slurry is applied to a positive electrode current collector and a negative electrode current collector to prepare a positive electrode and a negative electrode, and an electrode assembly having a predetermined shape is formed by laminating them on both sides of a separator. Then, the electrode assembly is accommodated in the battery case, and the electrolyte is injected and then sealed.
- Electrode assemblies are classified into various types. For example, a simple stack type in which anodes, separators, and cathodes are continuously stacked by crossing each other without manufacturing a unit cell, a unit cell is first manufactured using anodes, separators, and cathodes, and then these unit cells are Lamination & Stack Type (L&S, Lamination & Stack Type), a stack in which a plurality of electrodes or unit cells are spaced apart and attached to one side of a long separator sheet on one side, and the separator sheet is repeatedly folded in the same direction from one end S&F (Stack & Folding Type), a plurality of electrodes or unit cells are alternately attached to one side and the other side of a long separator sheet on one side, and the separator sheet is folded in a specific direction from one end and then turned in the opposite direction There is a Z-folding type that alternately repeats the folding method.
- L&S Lamination & Stack Type
- a unit cell in order to manufacture a lamination & stack type (L&S, lamination & stack type) electrode assembly, a unit cell must first be manufactured.
- L&S lamination & stack type
- separators are respectively stacked on upper and lower surfaces of the central electrode, and then the upper electrode is further stacked on the uppermost part.
- a lower electrode may be further stacked at the bottom.
- a laminating process of applying heat and pressure to the laminate in which the electrode and the separator are laminated is performed. By performing such a laminating process, a unit cell may be firmly formed by adhesion between the electrode and the separator.
- the laminating process was performed after the lower separator, the center electrode, the upper separator, and the upper electrode were all stacked. Therefore, since the overall thickness is in a thickened state, there is a problem in that the heat is not transmitted to the inside of the laminate and the adhesive force is lowered. In particular, at the interface between the innermost central electrode and the upper separator, the adhesive force was lowered, and the electrode and the separator did not adhere to each other, so there was a problem that the electrode was separated from the original position.
- An object of the present invention is to provide an apparatus and method for manufacturing a unit cell capable of preventing the position of the upper electrode from being deviated when the upper electrode is laminated on a laminate formed by laminating a central electrode and a separator sheet .
- a unit cell manufacturing apparatus for solving the above problems includes: a central electrode reel on which a central electrode sheet on which a plurality of central electrodes are formed is unwound; a separator reel on which the separator sheet laminated with the central electrode is unwound; a laminator in which a plurality of the central electrodes are spaced apart in a line in the longitudinal direction of the separator sheet, and laminating a laminate formed by laminating the separator sheet; a first nozzle for applying an adhesive to the upper surface of the separator sheet disposed on the uppermost layer of the laminated laminate; and an upper electrode reel on which an upper electrode sheet is unwound, on which a plurality of upper electrodes stacked on an upper surface of the laminate to which the adhesive is applied are formed.
- a first vision sensor disposed above the center electrode to photograph the center electrode may be further included.
- a second vision sensor disposed above the upper electrode to photograph the upper electrode may be further included.
- the laminator may include a heating roller for applying heat and pressure to the laminate while rotating.
- the laminator may further include a heater for applying heat and pressure to the front surface of the laminate.
- the separator reel may include: an upper separator reel on which an upper separator sheet stacked on the upper surface of the central electrode is unwound; and a lower separator reel from which a lower separator sheet stacked on a lower surface of the central electrode is unwound.
- a plurality of lower electrodes stacked on the lower surface of the laminate may be formed, and a lower electrode reel from which a lower electrode sheet is unwound may be further included.
- a second nozzle for applying an adhesive to the upper surface of the lower electrode may be further included.
- a third vision sensor disposed above the lower electrode to photograph the lower electrode may be further included.
- the upper electrode when the upper electrode is laminated with the laminate, it may further include a nip roller for applying pressure to the upper electrode and the laminate while rotating.
- the first nozzle may be provided with a plurality of spaced apart in the width direction of the separator sheet.
- At least one of a spraying cycle, a spraying area, and a spraying amount of the adhesive may be different from each other.
- the upper separator sheet, the first base layer; and a first coating layer coated on the upper surface of the first base layer, the adhesive is applied, and bonded to the upper electrode.
- the lower separator sheet may include a second base layer; and a second coating layer coated on the upper surface of the second base layer and bonded to the central electrode.
- the binder content of the first coating layer may be lower than the binder content of the second coating layer.
- the binder content of the first coating layer may be 2 wt% to 3 wt%.
- the second coating layer may have a binder content of 10 wt% to 20 wt% and may be a Safety Reinforced Separator (SRS) coating layer.
- SRS Safety Reinforced Separator
- the upper separator sheet may include a first base layer to which the adhesive is applied and bonded to the upper electrode.
- the lower separator sheet may include a second base layer; and a coating layer coated on an upper surface of the second base layer and bonded to the central electrode.
- a method for manufacturing a unit cell according to an embodiment of the present invention for solving the above problems includes: forming a plurality of central electrodes by cutting a central electrode sheet unwound from a central electrode reel; forming a laminate by arranging and stacking a plurality of the center electrodes spaced apart in a line in the longitudinal direction of the separator sheet on the separator sheet unwound from the separator reel; laminating the laminate with a laminator; applying an adhesive by a first nozzle to the upper surface of the separator sheet disposed on the uppermost layer of the laminate; forming a plurality of upper electrodes by cutting the upper electrode sheet unwound from the upper electrode reel; and laminating a plurality of upper electrodes on the upper surface of the laminate to which the adhesive is applied.
- the method may further include, before the forming of the stacked body, the first vision sensor disposed above the central electrode to photograph the central electrode.
- the method may further include, before the stacking of the upper electrode, the step of photographing the upper electrode by a second vision sensor disposed above the upper electrode.
- a plurality of the upper electrodes may be stacked on the upper surface of the laminate while being spaced apart in a line in the longitudinal direction of the separator sheet.
- the laminating may include applying heat and pressure to the laminate while the heating roller rotates.
- the laminating may further include applying heat and pressure to the front surface of the laminate by a heater before the heating roller applies heat and pressure.
- the step of forming the upper electrode when the step of forming the upper electrode is performed, the step of forming a plurality of lower electrodes by cutting the lower electrode sheet unwound from the lower electrode reel is also performed, and when the step of laminating the upper electrode is performed, The step of laminating a plurality of the lower electrodes on the lower surface of the laminate may also be performed.
- the second nozzle applying the adhesive to the upper surface of the lower electrode may also be performed.
- a region to which the adhesive is applied may correspond to at least a portion of an edge of the upper electrode.
- the region to which the adhesive is applied may include regions corresponding to four vertices of the upper electrode.
- the region to which the adhesive is applied may form a plurality of rows parallel to the moving direction of the laminate.
- a gap between regions to which the adhesive is applied in one row may be narrower than a gap between regions to which the adhesive is applied in another row.
- each region to which the adhesive is applied in one row may be smaller than the size of each region to which the adhesive is applied in the other row.
- the one row may be located more outside than the other row in the width direction of the laminate.
- any one of the columns may correspond to an electrode tab of the upper electrode.
- the upper electrode is laminated after the laminating process is first performed on the laminate formed by laminating the central electrode and the separator, heat is transferred to the inside of the laminate in the laminating process, thereby reducing the adhesive strength between the electrode and the separator. have.
- the upper electrode is laminated after the adhesive is applied on the upper surface of the laminate on which the laminating process has been performed, it is possible to prevent the upper electrode from being displaced.
- the effect according to the present invention is not limited by the contents exemplified above, and more various effects are included in the present specification.
- FIG. 1 is a flowchart of a method for manufacturing a unit cell according to an embodiment of the present invention.
- FIG. 2 is a schematic diagram of an apparatus for manufacturing a unit cell according to an embodiment of the present invention.
- FIG 3 is a schematic side view showing in detail an apparatus for manufacturing a unit cell according to an embodiment of the present invention.
- FIG. 4 is a cross-sectional view of an upper separator sheet according to an embodiment of the present invention.
- FIG. 5 is a cross-sectional view of a lower separator sheet according to an embodiment of the present invention.
- FIG. 6 is a view showing a nozzle according to an embodiment of the present invention.
- FIG. 7 is a view showing an adhesive region between the upper separator sheet and the upper electrode of FIG. 3 .
- FIG. 8 is a schematic diagram of an apparatus for manufacturing a unit cell according to another embodiment of the present invention.
- FIG. 9 is a side schematic view showing in detail an apparatus for manufacturing a unit cell according to another embodiment of the present invention.
- FIG. 10 is a view showing a nozzle according to another embodiment of the present invention.
- FIG. 11 is a view showing an adhesive region between the upper separator sheet and the upper electrode of FIG. 9 .
- FIG. 12 is a schematic diagram of an apparatus for manufacturing a unit cell according to another embodiment of the present invention.
- FIG. 13 is a side schematic view showing in detail an apparatus for manufacturing a unit cell according to another embodiment of the present invention.
- FIG. 1 is a flowchart of a method for manufacturing a unit cell according to an embodiment of the present invention.
- the upper electrode 1122 since the upper electrode 1122 is laminated after the laminating process is first performed on the laminate 20 formed by laminating the central electrode 1112 and the separator 12, heat is generated in the laminating process. It is transmitted to the inside of the laminate 20 to prevent a problem in which the adhesive force between the electrode 11 and the separator 12 is lowered.
- the upper electrode 1122 since the upper electrode 1122 is laminated on the upper surface of the laminate 20 that has been subjected to the laminating process after the adhesive is applied, it is possible to prevent the upper electrode 1122 from being displaced.
- the method for manufacturing a unit cell includes cutting the center electrode sheet 1111 unwound from the center electrode reel 111 to form a plurality of center electrodes 1112 (S101); By stacking the plurality of center electrodes 1112 on the separator sheets 1211 and 1221 unwound from the separator reels 121 and 122 in a line in the longitudinal direction of the separator sheets 1211 and 1221 and stacking them, Forming (20) (S102); laminating the laminate 20 with a laminator (S103); applying an adhesive by the first nozzle 14 to the upper surfaces of the separator sheets 1211 and 1221 disposed on the uppermost layer of the laminate 20 (S104); forming a plurality of upper electrodes 1122 by cutting the upper electrode sheet 1121 unwound from the upper electrode reel 112; and laminating a plurality of upper electrodes 1122 on the upper surface of the laminate 20 to which the adhesive is applied (S105).
- FIG. 2 is a schematic diagram of a unit cell manufacturing apparatus 1 according to an embodiment of the present invention.
- the unit cell manufacturing apparatus 1 includes a central electrode reel 111 on which a central electrode sheet 1111 on which a plurality of central electrodes 1112 are formed is unwound; a separator reel (121, 122) on which the separator sheet (1211, 1221) stacked with the central electrode (1112) is unwound; a plurality of the central electrodes 1112 are arranged spaced apart in a line in the longitudinal direction of the separator sheets 1211 and 1221, and a laminator for laminating a laminate 20 formed by being laminated with the separator sheets 1211 and 1221; a first nozzle 14 for applying an adhesive to the upper surfaces of the separator sheets 1211 and 1221 disposed on the uppermost layer of the laminated body 20; and an upper electrode reel 112 on which an upper electrode sheet 1121 is unwound, on which a plurality of upper electrodes 1122 stacked on an upper surface of the laminate 20 to which the adhesive is applied are formed.
- the separator reels 121 and 122 may include an upper separator reel 121 on which an upper separator sheet 1211 stacked on an upper surface of the central electrode 1112 is unwound; and a lower separator reel 122 from which a lower separator sheet 1221 stacked on a lower surface of the center electrode 1112 is unwound.
- the center electrode reel 111 is a reel on which the center electrode sheet 1111 is wound, and the center electrode sheet 1111 is unwound from the center electrode reel 111 . Then, the center electrode sheet 1111 is cut to form the center electrode 1112 .
- the electrode sheets 1111 and 1121 may be manufactured by coating a slurry of an electrode active material, a conductive material, and a binder on an electrode current collector, then drying and pressing the slurry.
- the upper separator reel 121 and the lower separator reel 122 are reels on which the separator sheets 1211 and 1221 are wound. And, the upper separator sheet 1211 unwound from the upper separator reel 121 is laminated on the upper surface of the center electrode 1112 formed by cutting the center electrode sheet 1111 , and the lower part unwound from the lower separator reel 122 .
- the separator sheet 1221 is laminated on the lower surface of the center electrode 1112 .
- the stacked body 20 in which the lower separator sheet 1221 , the center electrode 1112 , and the upper separator sheet 1211 are sequentially stacked is formed.
- the laminate 20 is formed by stacking a plurality of center electrodes 1112 on the separator sheets 1211 and 1221 and spaced apart from each other in a line in the longitudinal direction of the separator sheets 1211 and 1221 .
- the laminator laminates the entire surface of the stacked body 20 formed by stacking the central electrode 1112 and the separator 12 .
- the laminating refers to bonding the central electrode 1112 and the separator 12 by applying heat and pressure to the laminate 20 .
- the laminator includes a heater 15 that applies heat and pressure to the front surface of the laminate 20, and a heating roller 16 that applies pressure to the laminate 20 while rotating. can do.
- the heater 15 is formed of an upper heater 151 and a lower heater 152 , and may apply heat and pressure to the front surfaces of the upper and lower surfaces of the laminate 20 , respectively.
- the heater 15 may have a surface in contact with the laminate 20 , that is, a lower surface of the upper heater 151 and an upper surface of the lower heater 152 to be substantially flat. Accordingly, heat and pressure can be uniformly applied to the entire surface of the laminate 20 .
- heat and pressure may be applied to the laminate 20 while the heating roller 16 rotates.
- the pressure applied by the heating roller 16 that applies pressure while rotating is greater than that of the heater 15 that simply applies pressure to a flat surface. Therefore, after the heater 15 applies heat and pressure to the laminate 20 , the heating roller 16 applies heat and pressure greater than that of the heater 15 to the laminate 20 , so that the laminate ( 20), the heat and pressure applied to it may be increased step by step. That is, while preventing the inside of the laminate 20 from being damaged due to sudden changes in temperature and pressure, the laminate 20 may be laminated more strongly.
- the nozzle 14 applies an adhesive to the upper surface of the laminated body 20 .
- the adhesive is applied to the upper surface of the upper separator sheet 1211 .
- a plurality of nozzles 14 may be provided to be spaced apart from each other along the width direction of the separation membrane sheets 1211 and 1221 . Accordingly, the adhesive may be simultaneously applied to different regions of the upper surface of the upper separator sheet 1211 . Accordingly, the adhesive application operation by the nozzle 14 can be performed quickly.
- some of the plurality of nozzles 14 apply an adhesive in the vicinity of both edges of the upper separator sheet 1211 in the width direction, and some of the plurality of nozzles 14 apply an adhesive near the center of the upper separator sheet 1211. have.
- the spraying speed, spraying amount, spraying area, etc. of the adhesive sprayed from the plurality of nozzles 14 can be individually controlled.
- at least one of a spraying period, a spraying area, or an amount of spraying of the adhesive may be adjusted to be different from each other.
- the adhesive is preferably uniformly applied to the upper surface of the laminate 20 .
- the amount of the adhesive may be excessively large.
- the adhesive may flow to the outside of the laminate 20 to contaminate other parts, and the function of generating power may not be smooth when the secondary battery is manufactured.
- the adhesive may be applied by a spot application method in which the upper surface of the laminate 20 is applied in a dot form or a line application method in which a line form is applied.
- the upper electrode 1122 is still not fixed to the laminate 20 while the laminate 20 moves, and the upper electrode 1122 may deviate from the original position. . Therefore, it is preferable that the interval of the area to which the adhesive is applied is not excessively wide.
- an adhesive must maintain adhesiveness even when the separator 12 is impregnated with the electrolyte. Therefore, it is desirable to have a property of corrosion resistance that is not denatured by a chemical cause.
- Such an adhesive is a hot melt adhesive, and preferably includes a modified olefin-based thermoplastic resin.
- the upper electrode reel 112 is a reel on which the upper electrode sheet 1121 is wound, and the upper electrode sheet 1121 is unwound from the upper electrode reel 112 . Then, the upper electrode sheet 1121 is cut to form a plurality of upper electrodes 1122 , and the plurality of upper electrodes 1122 are laminated on the upper surface of the laminate 20 to which the adhesive is applied. In this case, the plurality of upper electrodes 1122 may be stacked on the upper surface of the laminate 20 while being spaced apart from each other in a line in the longitudinal direction of the separator sheets 1211 and 1221 . Since the upper electrode 1122 and the center electrode 1112 have different sizes, the spacing may be different from each other. However, it is preferable that the upper electrode 1122 and the center electrode 1112 are aligned and arranged so that their centers coincide with each other.
- the unit cell manufacturing method according to an embodiment of the present invention may be performed as follows.
- the first cutter 131 cuts the center electrode sheet 1111 ( S101 ). Then, a plurality of center electrodes 1112 are formed. Then, the upper separator sheet 1211 is unwound from the upper separator reel 121, stacked on the upper surface of the central electrode 1112, and the lower separator sheet 1221 is unwound from the lower separator reel 122, and the central electrode ( By laminating on the lower surface of 1112 , the laminate 20 is formed ( S102 ).
- the first nip roll 181 is provided on both sides of the laminate 20 , respectively. It may be arranged to apply pressure to the laminate 20 while rotating.
- the laminator laminates the laminate 20 (S103).
- the laminator includes a heater 15 and a heating roller 16, and when laminating, the heater 15 applies heat and pressure to the front surface of the laminate 20, and then a heating roller ( 16) while rotating, heat and pressure may be applied to the laminate 20 .
- the second cutter 132 cuts the laminate 20 at regular intervals, and the nozzle 14 applies an adhesive to the upper surface of the cut laminate 20 ( S104 ). Meanwhile, when the upper electrode sheet 1121 is unwound from the upper electrode reel 112 , the third cutter 133 cuts the upper electrode sheet 1121 to form the upper electrode 1122 . And the upper electrode 1122 is laminated on the upper surface of the laminate 20 to which the adhesive is applied (S105). Accordingly, the unit cell 2 in which the lower separator sheet 1221 , the center electrode 1112 , the upper separator sheet 1211 , and the upper electrode 1122 are sequentially stacked is manufactured.
- the second nip roll 182 is disposed on both surfaces of the upper electrode 1122 and the laminate 20, respectively. , while rotating, pressure may be applied to the upper electrode 1122 and the stacked body 20 .
- FIG. 3 is a schematic side view showing the unit cell manufacturing apparatus 1 in detail according to an embodiment of the present invention.
- the center electrode 1112 before the center electrode 1112 is laminated with the separator sheets 1211 and 1221, the center electrode 1112 a first vision sensor 171 disposed above the central electrode 1112 to photograph the central electrode 1112; and a second vision sensor 172 disposed above the upper electrode 1122 to photograph the upper electrode 1122 before the upper electrode 1122 is laminated with the stack body 20 .
- a first vision sensor 171 disposed above the central electrode 1112 to photograph the central electrode 1112
- a second vision sensor 172 disposed above the upper electrode 1122 to photograph the upper electrode 1122 before the upper electrode 1122 is laminated with the stack body 20 .
- the first and second vision sensors 171 and 172 acquire an image by photographing a specific area and receiving an image signal for the specific area.
- a vision sensor includes an imaging device such as a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS).
- CCD charge coupled device
- CMOS complementary metal-oxide semiconductor
- the first and second vision sensors 171 and 172 may acquire images by photographing the center electrode 1112 and the upper electrode 1122 , respectively.
- the unit cell manufacturing apparatus 1 determines whether the center electrode 1112 and the upper electrode 1122 are defective through the images of the center electrode 1112 and the upper electrode 1122 . It may further include a control unit (not shown) that can do this.
- the control unit compares the acquired image with the images of the pre-stored quality center electrode 1112 and upper electrode 1122, and the size, shape, or damage of the center electrode 1112 and the upper electrode 1122, etc. can figure out
- the central electrode 1112 is The first vision sensor 171 disposed above can photograph the central electrode 1112 , and is disposed above the upper electrode 1122 before stacking the upper electrode 1122 on the stack 20 .
- the second vision sensor 172 may photograph the upper electrode 1122 . That is, before the electrode 11 is laminated with the separator 12 , it is possible to check in advance whether only the electrode 11 is defective.
- FIG. 4 is a cross-sectional view of an upper separator sheet according to an embodiment of the present invention
- FIG. 5 is a cross-sectional view of a lower separator sheet according to an embodiment of the present invention.
- Each of the separator sheets 1211 and 1221 may include base layers 1211a and 1221a and coating layers 1211b and 1221b.
- the substrate layers 1211a and 1221a are porous substrates, and may include polyethylene or polypropylene resin.
- the coating layers 1211b and 1221b may be formed by coating the base layers 1211a and 1221a with a ceramic slurry including a filler and a binder.
- the coating layers 1211b and 1221b may be ceramic coating layers.
- the filler may include alumina (aluminum oxide)
- the binder may include polyvinylidene fluoride (PVDF).
- the upper separator sheet 1211 may include a first base layer 1211a and a first coating layer 1211b coated on the upper surface of the first base layer 1211a
- the lower separator sheet 1221 may include a second base layer 1221a and a second coating layer 1221b coated on the upper surface of the second base layer 1221a.
- the center electrode 1112 may be bonded to the upper surface of the second coating layer 1221b by the laminating process described above.
- the second coating layer 1221b may be a Safety Reinforced Separator (SRS) coating layer.
- SRS Safety Reinforced Separator
- the binder content of the second coating layer 1221b may be 10 wt% to 20 wt%.
- the nozzle 14 may apply an adhesive to the upper surface of the first coating layer 1211b, and the upper electrode 1122 may be bonded to the upper surface of the first coating layer 1211b by the adhesive.
- the binder content of the first coating layer 1211b may be lower than the binder content of the second coating layer 1221b.
- the binder content of the first coating layer 1211b may be less than half of the binder content of the second coating layer 1221b. Accordingly, the thickness t1 of the first coating layer 1211b may be thinner than the thickness t2 of the second coating layer 1221b.
- the thickness of the upper separator sheet 1211 may be reduced, and the energy density of the unit cell 2 may be improved.
- the binder content of the first coating layer 1211b may be 2 wt% to 3 wt%. Accordingly, the bonding between the first coating layer 1211b and the first base layer 1211a may be maintained while maintaining the thickness of the first coating layer 1211b as thin as possible. If the binder content of the first coating layer 1211b is less than 2 wt%, there is a problem in that bonding between the first coating layer 1211b and the first base layer 1211a is not maintained. In addition, when the binder content of the first coating layer 1211b exceeds 3 wt%, the thickness of the first coating layer 1211b may be increased.
- the nozzle 14 may apply an adhesive to the upper surface of the first base layer 1211a, and the lower surface of the upper electrode 1122 may be bonded to the upper surface of the first base layer 1211a by the adhesive.
- the thickness of the upper separator sheet 1211 becomes thinner.
- the configuration in which the upper separator sheet 1211 does not include the first coating layer 1211b is preferably applied when the upper electrode 1122 is an anode in terms of stability.
- FIG. 6 is a view showing a nozzle according to an embodiment of the present invention.
- the nozzle 14 may spray the adhesive (S) in the form of a mist by spraying the adhesive particles and compressed air together.
- the nozzle 14 supplies a housing 141 having an inner space, a tube 142 for supplying the adhesive S to the inside of the housing 141 , and compressed air into the housing 141 . It may include a line 143 to.
- a spraying part 141a for spraying the adhesive S and compressed air together toward the upper separator sheet 1211 of the laminate 20 may be formed.
- the adhesive (S) is split into a mist by the compressed air in the process of being discharged together with the compressed air, and in that state, the upper separator sheet 1211, more specifically the upper surface of the first coating layer 1211b can be applied to
- the adhesive (S) applied through this spraying method can be applied by a preset amount at a preset location in the form of small particles, the adhesive is uniformly applied to the upper surface of the first coating layer 1211b of the upper separator sheet 1211. It is applied and penetrates evenly throughout the coated area to provide an optimal adhesive force without wasting the adhesive (S).
- the configuration of the nozzle 14 is not limited thereto, and it is of course possible to adopt an inkjet jetting method (see FIG. 10 ) to be described later.
- FIG. 7 is a view showing an adhesive region between the upper separator sheet and the upper electrode of FIG. 3 .
- the upper electrode 1122 may have a rectangular shape having a pair of relatively short short sides and a pair of relatively longer long sides.
- the upper electrode 1122 may be laminated on the upper separator sheet 1211 so that the long side is parallel to the width direction of the upper separator sheet 1211 .
- An adhesive region A1 bonded to each other by an adhesive may be positioned between the upper electrode 1122 and the upper separator sheet 1211 . That is, the adhesive area A1 may mean an area in which the nozzle 14 applies an adhesive to the upper surface of the upper separator sheet 1211 .
- the adhesive area A1 may extend along the circumference of the upper electrode 1122 .
- the adhesive area (A) may form a rectangular ring shape, and may surround the non-adhesive area (A2).
- the bottom edge of the upper electrode 1122 may be adhered to the upper separator sheet 1211 .
- the adhesive region A may protrude to correspond to the electrode tab protruding from the upper electrode 1122 .
- the bonding area A1 may extend along both short sides of the upper electrode 1122 . Accordingly, portions adjacent to both short sides of the bottom surface of the upper electrode 1122 may be adhered to the upper separator sheet 1211 .
- the non-adhesive area A2 may include areas adjacent to both long sides of the bottom surface of the upper electrode 1122 .
- the adhesive region A may protrude to correspond to the electrode tab protruding from the upper electrode 1122 .
- the bonding area A1 may extend along both long sides of the upper electrode 1122 . Accordingly, portions adjacent to both long sides of the bottom surface of the upper electrode 1122 may be adhered to the upper separator sheet 1211 .
- the non-adhesive area A2 may include an area adjacent to both short sides of the bottom surface of the upper electrode 1122 .
- the region to which the adhesive is applied may correspond to at least a portion of the edge of the upper electrode 1122 .
- the bonding area A1 may be located in an area corresponding to the four vertices of the upper electrode 1122 . Accordingly, portions of the bottom surface of the upper electrode 1122 adjacent to the four vertices may be adhered to the upper separator sheet 1211 .
- the non-adhesive area A2 may include a portion of a bottom surface of the upper electrode 1122 adjacent to both long sides and a portion of an area adjacent to both short sides of the upper electrode 1122 .
- the adhesive region A may additionally include a region (not shown) corresponding to the central portion of the upper electrode 1122 .
- FIG. 7E is shown in FIG.
- the bonding area A1 includes a first area extending along the circumference of the upper electrode 1122, and in addition to the first area, extending parallel to a short side or a long side of the upper electrode 1122 and extending to the upper electrode ( 1122) may include a second region passing through the central portion. Accordingly, a stronger adhesion than the first example is possible.
- the adhesive area A1 may surround the non-adhesive area A2 .
- a plurality of non-adhesive areas A2 may be formed by being partitioned from each other by a second area of the adhesive area A1 .
- the adhesive area A1 may protrude to correspond to the electrode tab protruding from the upper electrode 1122 .
- the area of the adhesive area A1 may be smaller than the area of the non-adhesive area A2.
- FIG. (A1) may have a shape corresponding to the upper electrode 1122. Accordingly, the entire bottom surface of the upper electrode 1122 may be adhered to the upper separator sheet 1211 . In this case, the non-adhesive area A2 does not exist.
- the region to which the adhesive is applied may include regions corresponding to the four vertices of the upper electrode 1122 .
- FIG. 8 is a schematic diagram of a unit cell manufacturing apparatus 1a according to another embodiment of the present invention
- FIG. 9 is a side schematic view showing in detail the unit cell manufacturing apparatus 1a according to another embodiment of the present invention.
- a laminating process is first performed on the stacked body 20 formed by stacking the central electrode 1112 and the separator 12, and then the upper electrode 1122 is stacked. Accordingly, in the laminating process, heat is transferred to the inside of the laminate 20 to prevent a problem in which the adhesive force between the electrode 11 and the separator 12 is lowered. Therefore, there is no need to apply excessively much heat and pressure to the laminate 20 in the laminating process.
- the heater 15 is removed from the laminator, and only the heating roller 16 is a laminate 20. to laminate
- the heating roller 16 can apply a greater pressure to the laminate 20 than the heater 15 , the heating roller 16 alone can sufficiently laminate the laminate 20 .
- the heater 15 is removed from the laminator, it is possible to prevent the unit cell manufacturing apparatus 1a from being complicated, and it is possible to reduce the overall volume and also reduce the cost.
- the heat and pressure applied by the heating roller 16 to the laminate 20 should be controlled so as not to be excessively large. .
- FIG. 10 is a view showing a nozzle according to another embodiment of the present invention.
- the nozzle 14 ′ may inkjet the adhesive S in the form of fine droplets by a change in pressure in the pressure chamber 141a ′.
- the nozzle 14' includes a housing 141' having a pressure chamber 141a', and a wall surface ( 142') and a pipe 143' for supplying the adhesive S to the pressure chamber 141a'.
- a discharge port 141b through which the adhesive S is discharged toward the upper separator sheet 1211 of the laminate 20 may be formed at the lower end of the housing 141 ′.
- the adhesive (S) is not discharged to the discharge port (141b) due to the viscosity of the adhesive (S) in the state filled in the pressure chamber (141a').
- the wall surface 142' moves in a direction to reduce the volume of the pressure chamber 141a'
- the internal pressure of the pressure chamber 141a' increases, and the adhesive S moves through the discharge port 141b. It is discharged to the outside through the coating is applied to the upper surface of the upper separator sheet (1211). And, when the wall surface 142' is restored to its original state, the discharge of the adhesive S is stopped.
- the adhesive (S) applied through this inkjet spraying method can be applied by a preset amount at a preset location in the form of small particles, the adhesive is uniformly applied to the upper surface of the first coating layer 1211b of the upper separator sheet 1211. It is applied and penetrates evenly throughout the coated area to provide an optimal adhesive force without wasting the adhesive (S).
- the configuration of the nozzle 14 ′ is not limited thereto, and it is of course also possible to adopt the spray injection method described above (see FIG. 6 ).
- FIG. 11 is a view showing an adhesive region between the upper separator sheet and the upper electrode of FIG. 9 .
- Adhesive regions A3, A4, and A5 bonded to each other by an adhesive may be positioned between the upper electrode 1122 and the upper separator sheet 1211 .
- the adhesive regions A3, A4, and A5 may be disposed along a plurality of rows parallel to the moving direction of the upper separator sheet 1211 .
- Each of the adhesive areas A3, A4, and A5 may be formed by applying an adhesive spot. Accordingly, the plurality of adhesive areas A3 , A4 , and A5 positioned in the same row may be spaced apart from each other with respect to the moving direction of the upper separator sheet 1211 .
- the region to which the adhesive is applied may form a plurality of rows parallel to the moving direction of the laminate 20 .
- the adhesive regions A3, A4, and A5 include a plurality of first adhesive regions A3 forming a column adjacent to the short side of the upper electrode 1122, and the electrode tab of the upper electrode 1122.
- a plurality of second adhesive regions A4 forming a corresponding row, and a plurality of third adhesive regions A5 forming a row located inside the first adhesive region A3 and the second adhesive region A4 may include
- the spacing between regions to which the adhesive is applied in a specific row may be different from the spacing between regions to which the adhesive is applied in another row.
- the adhesive may be more densely sprayed onto regions corresponding to the electrode tabs of the upper electrode 1122 and the edge portions of the upper electrode 1122 that require a large adhesive force.
- the spacing between the plurality of first adhesive regions A3 may be wider than the spacing between the plurality of second adhesive regions A4 and narrower than the spacing between the plurality of third adhesive regions A5 .
- the area of the regions to which the adhesive is applied in a specific row may be formed to be larger than the area of the regions to which the adhesive is applied in another row.
- the adhesive may be sprayed more widely in a region corresponding to the central portion of the upper electrode 1122 where the adhesive is not likely to leak.
- the size of each of the first adhesive areas A3 may be larger than the size of each second adhesive area A4 and smaller than the size of each third adhesive area A5 .
- FIG. 12 is a schematic diagram of a unit cell manufacturing apparatus 1b according to another embodiment of the present invention.
- electrode assemblies are classified into various types. For example, Simple Stack Type, Lamination & Stack Type (L&S), Stack & Folding Type (S&F), Z-Folding Type, etc. There is this.
- a unit cell 2 in which a separator 12 , an electrode 11 , a separator 12 , and an electrode 11 are sequentially stacked is manufactured. Accordingly, the electrode 11 is formed on one surface of the unit cell 2 and the separator 12 is formed on the other surface.
- These unit cells 2 are mainly used when manufacturing a lamination and stack type electrode assembly. However, when manufacturing the stack-and-folding type or Z-folding type electrode assembly, the unit cell 2a in which the electrodes 11 are formed on both sides is mainly used.
- the unit cell manufacturing apparatus 1b As shown in FIG. 12 , a plurality of lower electrodes 1132 stacked on the lower surface of the laminate 20 are formed, the lower electrode It further includes a lower electrode reel 113 from which the sheet 1131 is unwound.
- the lower electrode reel 113 is a reel on which a lower electrode sheet 1131 is wound, the lower electrode sheet 1131 is unwound from the lower electrode reel 113 and the lower electrode sheet 1131 is cut to form a plurality of lower electrodes 1132 . ) is formed.
- the second nozzle 14b may also apply the adhesive to the upper surface of the lower electrode 1132 .
- the lower electrode 1132 to which the adhesive is applied is laminated on the lower surface of the laminate 20 .
- a plurality of lower electrodes 1132 may be stacked while being spaced apart from each other in a line in the longitudinal direction of the separator sheets 1211 and 1221 .
- the upper electrode 1122, the center electrode 1112, and the lower electrode 1132 may be spaced apart from each other at different intervals, but since the electrodes 11 of the same polarity have the same size, the spaced distance is always constant. desirable. Therefore, if the upper electrode 1122 and the lower electrode 1132 are the electrodes 11 of the same polarity, the separation distance from the separator sheets 1211 and 1221 may be constant.
- the upper electrode 1122 , the center electrode 1112 , and the lower electrode 1132 are aligned and arranged so that their centers coincide.
- the second cutter 132 cuts the laminate 20 at regular intervals, and the first nozzle 14a applies an adhesive to the upper surface of the cut laminate 20 .
- the third cutter 133 cuts the upper electrode sheet 1121 to form the upper electrode 1122 .
- the fourth cutter 134 cuts the lower electrode sheet 1131 to form the lower electrode 1132 .
- the second nozzle 14b applies an adhesive to the upper surface of the lower electrode 1132 .
- the upper electrode 1122 is laminated on the upper surface of the laminate 20 to which the adhesive is applied, and the lower electrode 1132 to which the adhesive is applied is laminated on the lower surface of the laminate 20 . Accordingly, the unit cell 2b in which the lower electrode 1132 , the lower separator sheet 1221 , the center electrode 1112 , the upper separator sheet 1211 , and the upper electrode 1122 are sequentially stacked is manufactured.
- FIG. 13 is a side schematic view showing in detail the unit cell manufacturing apparatus (1b) according to another embodiment of the present invention.
- the second nozzle 14b is the upper surface of the lower electrode 1132 .
- a third vision sensor 173 disposed above the lower electrode 1132 to photograph the lower electrode 1132 may be further included before the adhesive is applied thereto. That is, the third vision sensor 173 may acquire an image by photographing the lower electrode 1132 . Accordingly, before the lower electrode 1132 is laminated with the stack 20 , it is possible to determine whether the size and shape of the lower electrode 1132 is defective or damaged.
- unit cell manufacturing apparatus 2 unit cell
- center electrode reel 112 upper electrode reel
- fourth cutter 14a first nozzle
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Abstract
Description
Claims (31)
- 복수의 중앙 전극이 형성되는 중앙 전극 시트가 권출되는 중앙 전극 릴;상기 중앙 전극과 적층되는 분리막 시트가 권출되는 분리막 릴;복수의 상기 중앙 전극이 상기 분리막 시트의 길이 방향으로 일렬로 이격 배치되며, 상기 분리막 시트와 적층되어 형성되는 적층체를 라미네이팅하는 라미네이터;라미네이팅된 상기 적층체의 최상층에 배치된 분리막 시트의 상면에 접착제를 도포하는 제1 노즐; 및상기 접착제가 도포된 상기 적층체의 상면에 적층되는 복수의 상부 전극이 형성되는, 상부 전극 시트가 권출되는 상부 전극 릴을 포함하는 단위 셀 제조 장치.
- 제1항에 있어서,상기 중앙 전극이 상기 분리막 시트와 적층되기 전에, 상기 중앙 전극의 상방에 배치되어 상기 중앙 전극을 촬영하는 제1 비전 센서를 더 포함하는 단위 셀 제조 장치.
- 제2항에 있어서,상기 상부 전극이 상기 적층체와 적층되기 전에, 상기 상부 전극의 상방에 배치되어 상기 상부 전극을 촬영하는 제2 비전 센서를 더 포함하는 단위 셀 제조 장치.
- 제1항에 있어서,상기 라미네이터는,회전하면서 상기 적층체에 열 및 압력을 인가하는 히팅 롤러를 포함하는 단위 셀 제조 장치.
- 제4항에 있어서,상기 라미네이터는,상기 적층체의 전면에 열 및 압력을 인가하는 히터를 더 포함하는 단위 셀 제조 장치.
- 제1항에 있어서,상기 분리막 릴은,상기 중앙 전극의 상면에 적층되는 상부 분리막 시트가 권출되는 상부 분리막 릴; 및상기 중앙 전극의 하면에 적층되는 하부 분리막 시트가 권출되는 하부 분리막 릴을 포함하는, 단위 셀 제조 장치.
- 제1항에 있어서,상기 적층체의 하면에 적층되는 복수의 하부 전극이 형성되는, 하부 전극 시트가 권출되는 하부 전극 릴을 더 포함하는 단위 셀 제조 장치.
- 제7항에 있어서,상기 하부 전극의 상면에 접착제를 도포하는 제2 노즐을 더 포함하는 단위 셀 제조 장치.
- 제8항에 있어서,상기 하부 전극이 상기 적층체와 적층되기 전에, 상기 하부 전극의 상방에 배치되어 상기 하부 전극을 촬영하는 제3 비전 센서를 더 포함하는 단위 셀 제조 장치.
- 제1항에 있어서,상기 상부 전극이 상기 적층체와 적층되면, 회전하면서 상기 상부 전극 및 상기 적층체에 압력을 인가하는 닙 롤러를 더 포함하는 단위 셀 제조 장치.
- 제1항에 있어서,상기 제1노즐은,상기 분리막 시트의 폭방향으로 이격된 복수개가 구비된 단위 셀 제조 장치.
- 제11항에 있어서,복수개의 상기 제1노즐은, 상기 접착제의 분사 주기, 분사 면적 또는 분사량 중 적어도 하나가 서로 상이한 단위 셀 제조 장치.
- 제6항에 있어서,상기 상부 분리막 시트는,제1기재층; 및상기 제1기재층의 상면에 코팅되고 상기 접착제가 도포되며 상기 상부 전극과 접합되는 제1코팅층을 포함하고,상기 하부 분리막 시트는,제2기재층; 및상기 제2기재층의 상면에 코팅되고 상기 중앙 전극과 접합되는 제2코팅층을 포함하고,상기 제1코팅층의 바인더 함량은, 상기 제2코팅층의 바인더 함량보다 낮은 단위 셀 제조 장치.
- 제13항에 있어서,상기 제1코팅층의 바인더 함량은, 2wt% 내지 3wt%인 단위 셀 제조 장치.
- 제13항에 있어서,상기 제2코팅층은, 바인더 함량이 10wt% 내지 20wt%이고 SRS(Safety Reinforced Separator) 코팅층인 단위 셀 제조 장치.
- 제6항에 있어서,상기 상부 분리막 시트는,상기 접착제가 도포되며 상기 상부 전극과 접합되는 제1기재층을 포함하고,상기 하부 분리막 시트는,제2기재층; 및상기 제2기재층의 상면에 코팅되고 상기 중앙 전극과 접합되는 코팅층을 포함하는 단위 셀 제조 장치.
- 중앙 전극 릴로부터 권출된 중앙 전극 시트를 절단하여 복수의 중앙 전극을 형성하는 단계;분리막 릴로부터 권출된 분리막 시트에, 복수의 상기 중앙 전극을 상기 분리막 시트의 길이 방향으로 일렬로 이격 배치하며 적층함으로써, 적층체를 형성하는 단계;상기 적층체를 라미네이터로 라미네이팅 하는 단계;상기 적층체의 최상층에 배치된 분리막 시트의 상면에 제1 노즐이 접착제를 도포하는 단계;상부 전극 릴로부터 권출된 상부 전극 시트를 절단하여 복수의 상부 전극을 형성하는 단계; 및상기 접착제가 도포된 상기 적층체의 상면에, 복수의 상부 전극을 적층하는 단계를 포함하는 단위 셀 제조 방법.
- 제17항에 있어서,상기 적층체를 형성하는 단계 이전에,상기 중앙 전극의 상방에 배치된 제1 비전 센서가, 상기 중앙 전극을 촬영하는 단계를 더 포함하는 단위 셀 제조 방법.
- 제18항에 있어서,상기 상부 전극을 적층하는 단계 이전에,상기 상부 전극의 상방에 배치된 제2 비전 센서가, 상기 상부 전극을 촬영하는 단계를 더 포함하는 단위 셀 제조 방법.
- 제17항에 있어서,상기 상부 전극을 적층하는 단계는,상기 적층체의 상면에, 복수의 상기 상부 전극을 상기 분리막 시트의 길이 방향으로 일렬로 이격 배치하며 적층하는 단위 셀 제조 방법.
- 제17항에 있어서,상기 라미네이팅을 하는 단계는,히팅 롤러가 회전하면서 상기 적층체에 열 및 압력을 인가하는 단계를 포함하는 단위 셀 제조 방법.
- 제21항에 있어서,상기 라미네이팅을 하는 단계는,상기 히팅 롤러가 열 및 압력을 인가하기 전에, 히터가 상기 적층체의 전면에 열 및 압력을 인가하는 단계를 더 포함하는 단위 셀 제조 방법.
- 제17항에 있어서,상기 상부 전극을 형성하는 단계가 수행될 때,하부 전극 릴로부터 권출된 하부 전극 시트를 절단하여 복수의 하부 전극을 형성하는 단계도 수행되고,상기 상부 전극을 적층하는 단계가 수행될 때,상기 적층체의 하면에, 복수의 상기 하부 전극를 적층하는 단계도 수행되는 단위 셀 제조 방법.
- 제23항에 있어서,상기 적층체의 상면에 접착제를 도포하는 단계가 수행될 때,상기 하부 전극의 상면에도 제2 노즐이 접착제를 도포하는 단계도 수행되는 단위 셀 제조 방법.
- 제17항에 있어서,상기 적층체의 상면에 접착제를 도포하는 단계에서 상기 접착제가 도포되는 영역은, 상기 상부 전극의 가장자리부 중 적어도 일부에 대응하는 단위 셀 제조 방법.
- 제17항에 있어서,상기 적층체의 상면에 접착제를 도포하는 단계에서 상기 접착제가 도포되는 영역은, 상기 상부 전극의 네 꼭지점에 대응되는 영역을 포함하는 단위 셀 제조 방법.
- 제17항에 있어서,상기 적층체의 상면에 접착제를 도포하는 단계에서,상기 접착제가 도포되는 영역은 상기 적층체의 이동 방향과 나란한 복수개의 열을 이루는 단위 셀 제조 방법.
- 제27항에 있어서,어느 하나의 열에서 상기 접착제가 도포된 영역들 사이의 간격은, 다른 하나의 열에서 상기 접착제가 도포된 영역들 사이의 간격 보다 더 좁은 단위 셀 제조 방법.
- 제27항에 있어서,어느 하나의 열에서 상기 접착제가 도포된 각 영역의 크기는, 다른 하나의 열에서 상기 접착제가 도포된 각 영역의 크기보다 작은 단위 셀 제조 방법.
- 제28항 또는 제29항에 있어서,상기 어느 하나의 열은 상기 적층체의 폭 방향에 대해 상기 다른 하나의 열보다 더 외측에 위치하는 단위 셀 제조 방법.
- 제28항 또는 제29항에 있어서,상기 어느 하나의 열은 상기 상부 전극의 전극탭에 대응되는 단위 셀 제조 방법.
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