WO2023195793A1 - 전극 형상 제어방법 및 전극 제조방법 - Google Patents
전극 형상 제어방법 및 전극 제조방법 Download PDFInfo
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- WO2023195793A1 WO2023195793A1 PCT/KR2023/004650 KR2023004650W WO2023195793A1 WO 2023195793 A1 WO2023195793 A1 WO 2023195793A1 KR 2023004650 W KR2023004650 W KR 2023004650W WO 2023195793 A1 WO2023195793 A1 WO 2023195793A1
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000011267 electrode slurry Substances 0.000 claims abstract description 108
- 230000000873 masking effect Effects 0.000 claims description 49
- 239000011248 coating agent Substances 0.000 claims description 37
- 238000000576 coating method Methods 0.000 claims description 37
- 238000001035 drying Methods 0.000 claims description 23
- 230000001678 irradiating effect Effects 0.000 claims description 17
- 230000008859 change Effects 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 19
- 239000000203 mixture Substances 0.000 description 19
- 239000002002 slurry Substances 0.000 description 11
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- 238000010586 diagram Methods 0.000 description 10
- 239000011247 coating layer Substances 0.000 description 9
- 238000012546 transfer Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 239000007772 electrode material Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
-
- 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
Definitions
- the present invention relates to a method of controlling the shape of an electrode and a method of manufacturing an electrode by fluidizing part of the electrode slurry by irradiating a laser capable of heat transfer on the surface after coating the electrode slurry.
- secondary batteries refer to batteries that can be charged and discharged, unlike primary batteries that cannot be recharged. These secondary batteries are widely used in the field of high-tech electronic devices such as phones, laptop computers, and camcorders.
- the above-mentioned secondary battery is classified into a can-type secondary battery and a pouch-type secondary battery, and the can-type secondary battery includes an electrode assembly, an electrolyte, a can containing the electrode assembly and the electrolyte, and a cap assembly mounted on the opening of the can. And the electrode assembly has a structure in which electrodes and separators are alternately stacked. And the electrode includes a current collector and an electrode active material coated on the current collector.
- Figure 1 is a diagram to explain the problems of lithium secondary batteries according to the prior art.
- the electrode composite layer 2 is formed on the electrode current collector 1 using an electrode slurry coating method.
- the electrode composite layer 2 is coated on both surfaces (upper and lower surfaces) of the electrode current collector 1.
- the electrode slurry at both ends of the electrode composite layer 2 flows down due to the action of external forces such as gravity/centrifugal force.
- the area where the electrode slurry flows is also commonly referred to as the sliding area.
- This sliding area causes capacity loss that causes the battery capacity to be lower than the target value.
- the thickness of both ends of the electrode composite layer 2 decreases, resulting in uneven contact with the separator S, resulting in separation (see symbol a in FIG. 1), thereby deteriorating the overall quality of the secondary battery.
- the electrode slurry flows down by gravity before drying, and both ends of the electrode mixture layer 2 protrude downward (symbol in FIG. 1 b), the protrusion is subjected to high stress during the subsequent rolling process.
- the N/P ratio may differ from the design value, and furthermore, if the N/P ratio is reversed, a problem may occur where lithium is precipitated in the sliding area.
- Korean Patent Publication No. 10-2017-0057953 discloses an electrode forming device that removes part of the electrode mixture layer by irradiating a laser beam on the surface of the electrode.
- the technology disclosed in the above document can shape the shape of the electrode surface, a portion of the electrode mixture layer is removed, resulting in a capacity loss equivalent to the removed electrode mixture layer.
- the purpose of the present invention is to provide an electrode shape control method and an electrode manufacturing method that can minimize capacity loss while controlling the shape of the electrode after electrode coating.
- An electrode shape control method including a is provided.
- the electrode slurry of the electrode sheet may be in a non-solidified state.
- the laser may be an ultra-short wave near-infrared laser.
- the forming step may include a process of irradiating a laser using a laser module, wherein the laser module includes: a laser oscillator that generates laser; and a masking member coupled below the laser oscillator and having one or more openings through which at least a portion of the laser generated from the laser oscillator passes.
- the laser module includes: a laser oscillator that generates laser; and a masking member coupled below the laser oscillator and having one or more openings through which at least a portion of the laser generated from the laser oscillator passes.
- the laser module may be configured to allow adjustment of the position and area of the opening.
- the laser module may be configured to adjust the position of the opening based on the transverse direction (TD) of the electrode sheet.
- the laser module controls one or more conditions among the vertical distance between the laser oscillator and the electrode sheet, the vertical distance between the masking member and the electrode sheet, the output of the laser, and the opening area of the opening.
- the amount of movement of the electrode slurry can be controlled.
- the laser module can control the direction of movement of the electrode slurry by adjusting the position of the opening.
- the masking member is a plate-shaped member having a plurality of through holes, and is capable of sliding movement on one plane of the plate-shaped member in order to open and close at least one of the plurality of through holes. It includes an opening and closing member coupled so as to do so, and a through hole that is not shielded by the opening and closing member may form the opening.
- the masking member includes a plurality of plate-shaped blocks arranged in a row along the transverse direction of the electrode sheet; It includes a block driving unit that allows each of the plurality of plate-shaped blocks to move horizontally along the transverse direction of the electrode sheet, and a space between adjacent plate-shaped blocks may form the opening.
- At least one of the laser oscillator and the masking member may be configured to reciprocate along a direction perpendicular to the plane of the electrode sheet.
- a coating step of applying an electrode slurry on a sheet-shaped current collector A forming step of irradiating a laser to at least a portion of the electrode sheet on which the electrode slurry is applied and moving the electrode slurry from the laser-irradiated area to an adjacent area to form the shape of the electrode slurry; and a drying step of drying the electrode sheet.
- the electrode slurry of the electrode sheet may be in a non-solidified state.
- the forming step may be performed prior to the initial drying step of the electrode sheet.
- the forming step may be performed before the drying step of the electrode sheet.
- the electrode shape control method and electrode manufacturing method according to the present invention can control the electrode shape without changing the coating conditions in the coating step, preventing the problem of electrode quality being deteriorated due to changes in coating conditions. there is.
- Figure 1 is a diagram showing the shape of an electrode in which a sliding area occurs after electrode coating.
- Figure 2 is a flowchart for explaining an electrode shape control method according to an embodiment of the present invention.
- FIG. 3 is a diagram briefly showing an electrode shape control method according to an embodiment of the present invention.
- Figures 4 and 5 are diagrams for explaining the process of controlling the position at which a laser is irradiated to an electrode sheet and the amount of laser irradiation according to an embodiment of the present invention.
- Figure 6 is a side view of an electrode shape forming apparatus according to an embodiment of the present invention.
- Figure 7 is a top view of Figure 6.
- Figure 8 is a graph showing the results of measuring the thickness of each electrode slurry before and after laser irradiation, according to an embodiment of the present invention.
- Figure 9 is a side view of a laser module according to the first embodiment of the present invention.
- Figure 10 is a diagram for explaining the operation of the masking member according to the first embodiment.
- Figure 11 is a side view of a laser module according to a second embodiment of the present invention.
- Figure 12 is a diagram for explaining the operation of the masking member according to the second embodiment.
- Figure 13 is a flowchart for explaining an electrode manufacturing method according to an embodiment of the present invention.
- FIG. 2 is a flowchart for explaining a method for controlling an electrode shape according to an embodiment of the present invention
- FIG. 3 is a diagram briefly showing a method for controlling an electrode shape according to an embodiment of the present invention.
- the electrode shape control method includes a coating step (S10) of applying an electrode slurry on a sheet-shaped current collector; It may include a forming step (S20) of irradiating a laser to at least a portion of the electrode sheet on which the electrode slurry is applied, moving the electrode slurry from the laser-irradiated area to an adjacent area, and forming the shape of the electrode slurry.
- the electrode shape control method may include a process of irradiating a laser to the surface of the electrode slurry in the forming step (S20), where the optical energy of the laser interacts with the electrode slurry. In the process, it is absorbed into the electrode slurry and converted into thermal energy, and the heat generated at this time is transferred to the surroundings.
- the temperature of the area of the electrode slurry irradiated with the laser and its surroundings increases, and due to the increase in temperature, the viscosity of the electrode slurry decreases, allowing it to easily move to adjacent areas.
- this laser can penetrate into the lower layer of the electrode sheet, so that not only the surface of the electrode slurry but also the electrode slurry adjacent to the current collector can flow by the laser. Accordingly, the electrode shape can be easily controlled to the shape desired by the operator.
- the electrode slurry of the electrode sheet is in a non-solidified state. Since the solvent component does not exist or exists in a very small amount in the completely dried and solidified electrode slurry, it is not easy to move the electrode slurry even when irradiated with a laser, and the light energy of the laser deteriorates the solidified electrode slurry, causing the electrode slurry to This is because there is a risk of detachment.
- the electrode slurry of the electrode sheet in the initial stage of the electrode sheet coating step or the electrode sheet drying step may be in a non-solid state.
- the beginning of the drying step may be a section in which the drying step is performed such that 30% or more, or 50% or more, or 60% or more of the solvent remains in the electrode slurry, based on the total amount of solvent to be removed from the electrode slurry through the drying step. there is.
- the electrode shape control method unlike the conventional method of etching and removing part of the electrode slurry with a laser, irradiates the laser to the area requiring shape deformation and moves the electrode slurry to the surroundings, thereby increasing the capacity. You can also have the advantage of almost no loss.
- the coating step (S10) may be a step of applying an electrode slurry onto a sheet-shaped current collector.
- the electrode slurry may be a concept that includes both an electrode-forming slurry containing an electrode active material and an electrode mixture layer formed by applying this electrode-forming slurry.
- the electrode slurry includes, in addition to the slurry for forming the electrode and the electrode mixture layer described above, an insulating coating layer composition applied around the area where the electrode slurry is applied to prevent short circuit, and an insulating coating layer formed by applying the insulating coating layer composition. It may be a concept that includes
- the coating step (S10) may include preparing a slurry for forming an electrode by mixing/stirring an electrode active material in a solvent and applying it to a current collector to form an electrode mixture layer.
- the slurry for forming the electrode may further include one or more materials selected from binders, conductive materials, and other additives.
- An electrode mixture layer is formed by applying a slurry for forming an electrode.
- the insulating coating layer can be formed by applying an insulating coating layer composition obtained by mixing/stirring insulating polymer and inorganic particles in a solvent onto a current collector.
- the composition for the insulating coating layer may be applied around the end of the electrode mixture layer, and may overlap a portion of the end of the electrode mixture layer.
- This slurry for forming an electrode and the composition for an insulating coating layer can be coated on a current collector by a conventionally known coating device such as a coating die, coating roll, or slide-slot, and the slurry for forming an electrode and the composition for an insulating coating layer can be coated. If it is in a form that can be used, it is not limited to this.
- a coating device including a coating die includes a coating die provided with an outflow slot to allow the electrode-forming slurry to flow outward toward the current collector, the coating die being spaced apart from the outflow slot of the coating die at a predetermined interval, and the electrode formed on the current collector by the coating die. It may have a structure including a coater roll that transfers the current collector by rotation so that the active material slurry can be applied.
- This coating device also controls the shape of the electrode by controlling factors such as the distance (Gap) between the coating die and the current collector, the viscosity of the slurry for forming the electrode or the viscosity of the composition for the insulating coating layer, the rotation speed of the coater roll, and the discharge pressure of the coating die. can be controlled, but when controlling these factors, the loading amount of the electrode also changes.
- the electrode shape control method of the present invention has the advantage of not having to change the coating control factor.
- the forming step (S20) may include a process of irradiating a laser to an electrode sheet using a laser module, and if the laser module is capable of irradiating a laser to the electrode slurry, the shape is limited. It doesn't work.
- the laser module 110 includes a laser oscillator 111 that generates laser; and a masking member 112.
- the specific embodiment is not particularly limited.
- the laser generated from the laser oscillator 111 may be an microwave near-infrared laser.
- the microwave near-infrared laser has a short wavelength and easily reaches the lower part of the electrode sheet in the thickness direction, so it is preferable because it allows the electrode slurry adjacent to the current collector to move to the adjacent area.
- the wavelength of this microwave near-infrared laser may be 500 nm to 1,500 nm, preferably 600 nm to 1,300 nm, and most preferably 700 nm to 1,100 nm.
- the wavelength length of the laser satisfies the above range, it is preferable because the laser can easily reach the lower part of the electrode sheet without damaging the electrode slurry.
- the output of the laser generated by the laser oscillator 111 can be adjusted by a controller (not shown), and the amount of movement of the electrode slurry can be controlled by adjusting the output of the laser.
- the masking member 112 may be coupled below the laser oscillator 111 and may include one or more openings 112a through which at least a portion of the laser generated from the laser oscillator 111 passes. It can be provided.
- the masking member 112 may be disposed below the laser oscillator 111 based on the direction perpendicular to the plane of the electrode sheet (z direction), and the masking member 112 may be disposed below the laser oscillator 111. It can serve to shield the laser from reaching the electrode sheet 10 below.
- the masking member 112 may be provided with at least one opening 112a, and the laser generated from the laser oscillator 111 may be irradiated to the lower electrode sheet only through the opening 112a.
- the laser module 110 may be configured to allow adjustment of the position and opening area of the opening 112a.
- the masking member 112 according to this embodiment can control the position and amount of laser irradiation to the electrode sheet.
- the position of the opening 112a can be adjusted, the position of the area where the laser passes through the opening 112a and is irradiated to the electrode slurry can be adjusted. Since the electrode slurry can be moved in the order from the part of the electrode slurry to which the laser is first irradiated to the part of the electrode slurry to which the laser is later irradiated, the direction of movement of the electrode slurry can be controlled by adjusting the position of the opening 112a. there is.
- the opening area of the opening 112a can be adjusted, the amount of movement of the electrode slurry can be controlled. That is, the larger the opening area, the larger the total amount of irradiated laser light energy, so the amount of movement of the electrode slurry can also increase. Conversely, the smaller the opening area, the smaller the total amount of irradiated laser light energy, so the amount of movement of the electrode slurry can be It can become smaller.
- the laser module 110 may be configured to adjust the position of the opening based on the transverse direction (TD) of the electrode sheet.
- the opening 112a of the masking member 112 may be configured to be horizontally movable along the transverse direction (TD, y-direction) of the electrode sheet 10, and accordingly, from the end of the electrode slurry. Movement of the electrode slurry toward the center of the electrode slurry becomes possible.
- Figures 4 and 5 are diagrams for explaining the process of controlling the position at which a laser is irradiated to an electrode sheet and the amount of laser irradiation according to an embodiment of the present invention.
- the electrode sheet 10 includes a holding portion 12 to which electrode slurry is applied and an uncoated portion 11 to which electrode slurry is not applied, and the opening 112a of the masking member 112 is , It may be open to a size corresponding to the transverse (y-direction) width and length of the holding portion. Accordingly, the laser (dotted arrow) generated from the laser oscillator 111 can pass through the opening 112a and irradiate the entire area along the transverse direction (y-axis direction) of the electrode slurry.
- the holding portion 12 to which the electrode slurry is applied can be divided into a central portion 12a and an edge portion 12b around both edges in the transverse direction (y direction) of the electrode holding portion.
- the opening 112a of the masking member 112 may be open to a size corresponding to the width and length of the edge portion 12b. Accordingly, the laser (dotted arrow) generated from the laser oscillator 111 can pass through the opening 112a and be irradiated only to the area of the edge portion 12b of the electrode holding portion 12.
- the electrode shape control method of the present invention is configured to enable adjustment of the position and opening area of the opening through which the masking member passes the laser, and thus can control the position and/or area of the laser irradiation area.
- Figure 6 is a side view of an electrode shape forming apparatus according to an embodiment of the present invention
- Figure 7 is a top view of Figure 6.
- the electrode shape control device 100 includes a laser module 110, a laser module driver 120, a frame 130, a transfer unit 140, and a controller (not shown). ) may include.
- the laser module driving unit 120 is coupled to one side of the laser module 110 and operates the laser module 110 in the longitudinal direction (x direction) of the electrode sheet 10 and the transverse direction (y direction) of the electrode sheet 10. direction) and a direction perpendicular to the plane of the electrode sheet (z direction).
- the laser module driver 120 may be configured to independently drive the laser oscillator 111 and the masking member 112. That is, the laser module driver 120 may include a first driver that drives the laser oscillator 111 and a second driver that drives the masking member.
- the first driving unit reciprocates the laser oscillator 111 along a direction (z direction) perpendicular to the plane of the electrode sheet in order to adjust the vertical distance between the laser oscillator 111 and the electrode sheet 10. It can be driven so that it can be moved.
- the second driving unit moves the masking member 112 in a direction perpendicular to the plane of the electrode sheet (z direction) in order to adjust the vertical distance between the masking member 112 and the electrode sheet 10. It can be driven to allow round-trip movement.
- the second driving unit may drive the masking member 112 to reciprocate along the transverse direction (TD, y direction) of the electrode sheet in order to adjust the position of the opening 112a of the masking member 112.
- the electrode shape control method according to this embodiment is configured so that at least one of the laser oscillator 111 and the masking member 112 can reciprocate along a direction perpendicular to the plane of the electrode sheet 10, so that the electrode slurry The amount of movement can be appropriately controlled.
- the frame 130 may serve as a support on which the laser module 110 is mounted above the electrode sheet 10.
- the transfer unit 140 may serve to transfer the electrode sheet 10 in the traveling direction (x direction).
- the transfer unit 140 may include a transfer roller that moves the electrode sheet in one direction through rotational movement and a motor (not shown) that provides rotational force to the transfer roller.
- the controller (not shown) may control the operation of various components of the electrode shape control device 100.
- the controller (not shown) controls the position of the opening 112a, the vertical distance between the laser oscillator 111 and the electrode sheet 10, and the vertical distance between the masking member 112 and the electrode sheet 10. It may serve to control one or more conditions among the distance, the output of the laser generated from the laser oscillator 111, and the opening area of the opening 112a.
- the controller can control the direction of movement of the electrode slurry by adjusting the position of the opening 112a.
- the controller controls the vertical distance between the laser oscillator 111 and the electrode sheet 10, the vertical distance between the masking member 112 and the electrode sheet 10, the output of the laser generated from the laser oscillator 111, and the opening ( Among the opening areas of 112a), the amount of movement of the electrode slurry can be controlled by controlling one or more conditions.
- Figure 8 is a graph showing the results of measuring the thickness of each electrode slurry before and after laser irradiation, according to an embodiment of the present invention.
- the thickness of the electrode slurry before irradiating the laser gradually decreases overall from about 8mm of the coating width corresponding to the x-axis to about 2mm of the coating width, and then decreases sharply thereafter. It represents.
- the temperature of the electrode slurry rises and flows due to the optical energy of the irradiated laser. This is in an easy state and moves in the direction of the arrow.
- the thickness of the electrode mixture layer within about 4 mm to about 1 mm of the coating width decreased, and the thickness of the electrode mixture layer within about 8 mm to 4 mm of the coating width increased.
- the electrode shape control method according to the present invention has the effect of irradiating a laser to the position where the operator wants to be formed, so that the electrode shape can be easily formed according to the operator's intention.
- the shape of the electrode is changed by using a laser to move the electrode slurry, there is almost no loss of electrode slurry, and the shape can be changed in the sliding area, flat area, or both areas of the electrode active material coating area. there is.
- FIG. 9 is a side view of a laser module according to the first embodiment of the present invention
- FIG. 10 is a diagram for explaining the operation of the masking member according to the first embodiment of FIG. 9.
- the laser module 110 includes a masking member 112, and the masking member 112 is a plate-shaped member having a plurality of through holes 112a.
- the masking member 112 may include an opening and closing member 113 that is slidably coupled to one side of the plane of the plate-shaped member 112.
- a through hole 112a that is not shielded by the opening and closing member 113 may form the opening.
- the opening and closing member 113 is configured to shield part or all of the opening formed by the through hole 112a, and the opening position and/or the opening of the opening is determined through the operation of the opening and closing member 113. Area can be controlled.
- the masking member 112 may be a plate-shaped member having a predetermined thickness d.
- the masking member 112 may be positioned between the laser oscillator 111 and the electrode sheet 10 based on the direction perpendicular to the plane of the electrode sheet (z direction).
- the opening and closing member 113 may be coupled to one plane of the plate-shaped masking member 112. In FIGS. 9 and 10, the opening and closing member 113 is shown coupled to the lower surface of the masking member 112. It is not limited and may be coupled to the upper surface of the masking member 112.
- the opening and closing member 113 may be a plate-shaped member, and one opening and closing member may slide to shield part or all of the through hole 112a that needs to be shielded, as shown in FIGS. 9 and 10. As shown, two or more plate-shaped members are gathered to form one opening and closing member 113, but the plurality of opening and closing members may be configured to slide independently. When there are two or more opening and closing members 113, it may be easier to select the location of the through hole 112a to be shielded.
- the through hole 112a is in the form of penetrating from one side of the plate-shaped masking member 112 to the other side, and the laser generated from the laser oscillator 111 can pass through the through hole 112a and be irradiated to the electrode sheet. . That is, the through hole 112a may form an opening.
- a portion of the masking member 112 where a through hole is not formed may shield the laser generated from the laser oscillator 111.
- a plurality of through holes 112a are formed in the masking member 112, and the opening and closing member 113 slides to the position of the through hole 112a that requires shielding of the laser.
- the opening and closing member 113 may cover part or all of the through hole to prevent the laser from being irradiated to the electrode sheet.
- the opening and closing member 113 selects the through hole to be shielded, the position at which the laser generated from the laser oscillator 111 is irradiated to the electrode sheet can be adjusted. Accordingly, the direction of movement of the electrode slurry can be controlled.
- the area of the through hole shielded by the opening and closing member 113 can be adjusted. That is, the entire area of one through hole may be shielded, or a partial area of one through hole may be shielded.
- the amount of laser irradiated to the electrode sheet 10 can be adjusted.
- the amount of movement of the electrode slurry can be controlled by adjusting the amount of laser irradiated to the electrode sheet.
- the position of the opening of the masking member can be freely selected by appropriately moving the shielding member 113 in order to irradiate the laser to the area where the electrode shape is to be controlled,
- the opening area of the opening By freely adjusting the opening area of the opening, the amount of laser radiation can be appropriately controlled. Therefore, the operator can freely select the laser irradiation area along the transverse direction of the holding portion to which the electrode slurry is applied. For example, if there is a protruding area (fat edge) on both edges of the holding part in the transverse direction (y direction) to which the electrode slurry is applied, the opening position and opening area of the opening of the masking member can be adjusted to selectively cover only that area.
- the electrode shape By irradiating a laser, the electrode shape can be controlled to a desired shape.
- Figure 11 is a side view of the laser module according to the second embodiment of the present invention
- Figure 12 is a diagram for explaining the operation of the masking member according to the first embodiment.
- the laser module according to the second embodiment includes a masking member 212, and the masking member 212 is aligned along the transverse direction of the electrode sheet 10.
- a plurality of plate-shaped blocks (212-1, 212-2, 212-3, 212-4) arranged; It may include a block driver (not shown) that allows each of the plurality of plate-shaped blocks 212-1, 212-2, 212-3, and 212-4 to move horizontally along the lateral direction of the electrode sheet.
- the space 212a between adjacent plate-shaped blocks may form the opening.
- a plurality of plate-shaped blocks (212-1, 212-2, 212-3, 212-4) are gathered to form the masking member 212, and the laser generated from the laser oscillator 211 is spaced apart from each other by the plate-shaped blocks. It is possible to reach the lower electrode sheet 10 through.
- the plurality of plate-shaped blocks 212-1, 212-2, 212-3, and 212-4 may each have an independently movable structure. As shown in FIG. 12, depending on the movement form of the plurality of plate-shaped blocks 212-1, 212-2, 212-3, and 212-4, the position and area where the laser is irradiated to the electrode sheet may be adjusted. there is.
- Figure 13 is a flowchart for explaining an electrode manufacturing method according to an embodiment of the present invention.
- the electrode manufacturing method includes a coating step (S110) of applying an electrode slurry on a sheet-shaped current collector; A forming step (S120) of forming the shape of the electrode slurry by irradiating a laser to at least a portion of the electrode sheet on which the electrode slurry is applied and moving the electrode slurry from the laser-irradiated area to an adjacent area; And it may include drying the electrode sheet (S130).
- the electrode slurry of the electrode sheet is not solidified. Since the solvent component does not exist or exists in a very small amount in the completely dried and solidified electrode slurry, it is not easy to move the electrode slurry even when irradiated with a laser, and the light energy of the laser deteriorates the solidified electrode slurry, causing the electrode slurry to This is because there is a risk of detachment.
- the drying step (S130) may be a step of removing the solvent in the electrode slurry using a hot air supply means or/and a radiant heat supply means to the electrode sheet.
- the drying step (S130) may be performed according to generally known technical details in the technical field of electrodes for lithium secondary batteries.
- the forming step (S120) may be performed before the initial drying step (S130) of the electrode sheet.
- the beginning of the drying step may be a section in which the drying step is performed such that 30% or more, or 50% or more, or 60% or more of the solvent remains in the electrode slurry, based on the total amount of solvent to be removed from the electrode slurry through the drying step. there is.
- the electrode slurry is in a state in which it is easy to move, and thus the electrode shape can be molded into the shape desired by the operator by irradiating a laser according to the present invention.
- the forming step (S120) may be performed before the drying step (S130) of the electrode sheet. That is, after performing the forming step (S120) of the present invention on the electrode sheet that has completed the coating step (S110), the drying step (S120) may be performed.
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Abstract
Description
Claims (15)
- 전극 슬러리가 도포된 전극 시트의 적어도 일부에 레이저를 조사하여, 레이저가 조사된 부위의 전극 슬러리를 인접 부위로 이동하도록 해, 전극 슬러리의 형상을 성형하는 성형 단계를 포함하는 전극 형상 제어방법.
- 제 1 항에 있어서, 상기 전극 시트의 전극 슬러리는 고상화되지 않은 상태인 전극 형상 제어방법.
- 제 1 항에 있어서, 상기 레이저는 극초단파 근적외선 레이저인 전극 형상 제어방법.
- 제 1 항에 있어서, 상기 성형 단계는, 레이저 모듈을 이용하여 레이저를 조사하는 과정을 포함하고,상기 레이저 모듈은,레이저를 생성하는 레이저 발진기; 및상기 레이저 발진기의 하방에 결합되어 있고, 레이저 발진기로부터 생성된 레이저의 적어도 일부를 통과시키는 하나 이상의 개구부를 구비하는 마스킹 부재를 포함하는 전극 형상 제어방법.
- 제 4 항에 있어서,상기 레이저 모듈은,상기 개구부의 위치 및 개구 면적의 조절이 가능하도록 구성된 전극 형상 제어방법.
- 제 4 항에 있어서,상기 레이저 모듈은,전극 시트의 횡방향(TD)을 기준으로, 상기 개구부의 위치 조절이 가능하도록 구성된 전극 형상 제어방법.
- 제 4 항에 있어서,상기 레이저 모듈은,레이저 발진기와 전극 시트 사이의 수직 거리, 마스킹 부재와 전극 시트 사이의 수직 거리, 레이저의 출력 및 상기 개구부의 개구 면적 중, 하나 이상의 조건을 제어하여 전극 슬러리의 이동량을 제어하는 전극 형상 제어방법.
- 제 4 항에 있어서,상기 레이저 모듈은,상기 개구부의 위치 조절을 통해, 전극 슬러리의 이동 방향을 제어하는 전극 형상 제어방법.
- 제 4 항에 있어서,상기 마스킹 부재는, 다수의 관통홀을 구비한 판상형의 부재이고,상기 다수의 관통홀 중의 적어도 하나 이상을 개폐하기 위하여, 상기 판상형 부재의 일측 평면상에 슬라이딩 이동 가능하도록 결합되는 개폐 부재를 포함하고,상기 개폐 부재에 의해 차폐되지 않은 관통홀이 상기 개구부를 형성하는 전극 형상 제어방법.
- 제 4 항에 있어서,상기 마스킹 부재는,전극 시트의 횡방향을 따라 일렬 배치되는 다수의 판상형 블록;상기 다수의 판상형 블록 각각을 전극 시트의 횡방향을 따라 수평 이동 가능케 하는 블록 구동부를 포함하며,상호 인접하는 판상형 블록의 이격 공간이, 상기 개구부를 형성하는 전극 형상 제어방법.
- 제 4 항에 있어서,상기 레이저 발진기 및 마스킹 부재 중 적어도 하나 이상은, 전극 시트의 평면에 수직한 방향을 따라 왕복 이동 가능하도록 구성된 전극 형상 제어방법.
- 시트 형태의 집전체 상에, 전극 슬러리를 도포하는 코팅 단계;전극 슬러리가 도포된 전극 시트의 적어도 일부에 레이저를 조사하여, 레이저가 조사된 부위의 전극 슬러리를 인접 부위로 이동하도록 해, 전극 슬러리의 형상을 성형하는 성형 단계; 및전극 시트를 건조하는 건조 단계를 포함하는 전극의 제조방법.
- 제 12 항에 있어서,상기 전극 시트의 전극 슬러리는 고상화되지 않은 상태인 전극의 제조방법.
- 제 12 항에 있어서,상기 성형 단계는 전극 시트의 건조 단계의 초기 이전에 수행되는 전극의 제조방법.
- 제 12 항에 있어서,상기 성형 단계는 전극 시트의 건조 단계 이전에 수행되는 전극의 제조방법.
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EP23785017.7A EP4325592A1 (en) | 2022-04-07 | 2023-04-06 | Electrode shape control method and electrode manufacturing method |
CN202380011938.0A CN117397050A (zh) | 2022-04-07 | 2023-04-06 | 电极形状控制方法和电极制造方法 |
JP2023572016A JP2024518633A (ja) | 2022-04-07 | 2023-04-06 | 電極形状制御方法および電極製造方法 |
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- 2023-04-06 EP EP23785017.7A patent/EP4325592A1/en active Pending
- 2023-04-06 WO PCT/KR2023/004650 patent/WO2023195793A1/ko active Application Filing
- 2023-04-06 JP JP2023572016A patent/JP2024518633A/ja active Pending
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KR20230044807A (ko) | 2021-09-27 | 2023-04-04 | 장신혁 | 양념 종지 조립체 |
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