WO2012053452A1 - レーザ切断方法 - Google Patents
レーザ切断方法 Download PDFInfo
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- WO2012053452A1 WO2012053452A1 PCT/JP2011/073712 JP2011073712W WO2012053452A1 WO 2012053452 A1 WO2012053452 A1 WO 2012053452A1 JP 2011073712 W JP2011073712 W JP 2011073712W WO 2012053452 A1 WO2012053452 A1 WO 2012053452A1
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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
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
-
- 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
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
-
- 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
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/04—Automatically aligning, aiming or focusing the laser beam, e.g. using the back-scattered light
- B23K26/046—Automatically focusing the laser beam
-
- 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
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
-
- 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
- B23K26/08—Devices involving relative movement between laser beam and workpiece
-
- 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
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
-
- 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
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
- B23K26/1462—Nozzles; Features related to nozzles
- B23K26/1464—Supply to, or discharge from, nozzles of media, e.g. gas, powder, wire
- B23K26/1476—Features inside the nozzle for feeding the fluid stream through the nozzle
-
- 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
- B23K26/351—Working by laser beam, e.g. welding, cutting or boring for trimming or tuning of electrical components
-
- 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
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/16—Composite materials, e.g. fibre reinforced
-
- 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
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
- B23K26/382—Removing material by boring or cutting by boring
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- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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 a laser cutting method for cutting a workpiece by a laser.
- JP2001-176501A discloses a method of laser cutting an electrode of a stacked battery.
- a workpiece is a current collector that forms an electrode by applying an active material to the surface.
- the generation of burrs caused by the wear of the press die can be suppressed as compared with the case of cutting with a press.
- the present invention has been made paying attention to such problems, and a laser cutting method capable of suppressing the burr height at the time of cutting and reducing the processing time of a pair of plate materials having different thicknesses.
- the purpose is to provide.
- a laser cutting method in which a pair of plate materials having different thicknesses and melting points are irradiated with a laser to cut, the lower melting point of the pair of plate materials
- a pair of plate materials are arranged side by side so that the opposite surface of the laser irradiation surface of the plate material protrudes from the opposite surface of the laser irradiation surface of the plate material having a higher melting point, and the focal point of the laser has the higher melting point of the pair of plate materials
- a pair of plate materials are cut by a series of operations while maintaining the focal position of the laser with respect to the pair of plate materials by irradiating a laser in accordance with the back surface opposite to the laser irradiation surface of the other plate material.
- FIG. 1 is a configuration diagram showing a laser cutting device used in a laser cutting method according to an embodiment of the present invention.
- FIG. 2 is an enlarged view around the machining head in the laser cutting apparatus of FIG.
- FIG. 3A is a diagram for explaining a plate material arranging step of the laser cutting method according to the embodiment of the present invention.
- FIG. 3B is a diagram illustrating a focus adjustment step of the laser cutting method according to an embodiment of the present invention.
- FIG. 3C is a diagram illustrating a plate cutting process of the laser cutting method according to the embodiment of the present invention.
- FIG. 3D is a diagram illustrating a gas spraying process of the laser cutting method according to an embodiment of the present invention.
- FIG. 1 is a configuration diagram showing a laser cutting device used in a laser cutting method according to an embodiment of the present invention.
- FIG. 2 is an enlarged view around the machining head in the laser cutting apparatus of FIG.
- FIG. 3A is a diagram for explaining a plate material arranging step
- FIG. 4 is a graph showing the influence of the change in the laser focus position on the burr height.
- FIG. 5A is a graph showing the influence of the change in the laser focus position on the kerf width.
- FIG. 5B is a diagram illustrating the kerf width.
- FIG. 6 is a graph showing the influence of the change in the gas pressure of the assist gas on the maximum burr height.
- a stacked battery 10 having a positive electrode tab 11a and a negative electrode tab 12a, which are workpieces, will be described with reference to FIGS.
- the laminated battery 10 is formed by laminating a positive electrode 11 and a negative electrode 12 via a separator (not shown) that is a porous film, and is housed in a laminate pack 15 together with an electrolyte.
- the laminated battery 10 is a laminated cell such as a lithium ion secondary battery.
- the positive electrode 11 includes a positive electrode current collector foil (not shown) coated with a positive electrode active material (not shown), and a positive electrode tab 11a joined to the positive electrode current collector foil.
- the positive electrode active material is formed of, for example, a lithium transition metal oxide such as lithium cobalt oxide or lithium manganate.
- the positive electrode current collector foil is formed of a metal such as aluminum, for example.
- the positive electrode tab 11a is a plate material having a laser irradiation surface 11b irradiated with a laser and a surface 11c opposite to the laser irradiation surface 11b.
- the positive electrode tab 11a is formed of 0.4 [mm] thick aluminum compared with the positive electrode current collector foil.
- the negative electrode 12 includes a negative electrode current collector foil (not shown) coated with a negative electrode active material (not shown), and a negative electrode tab 12a joined to the negative electrode current collector foil.
- the negative electrode active material is formed of a carbon-based material such as hard carbon or graphite, for example.
- the negative electrode current collector foil is formed of a metal such as copper, for example.
- the negative electrode tab 12a is also a plate material having a laser irradiation surface 12b irradiated with a laser and a surface 12c opposite to the laser irradiation surface 12b.
- the negative electrode tab 12a is formed of copper having a thickness of 0.2 [mm] which is thicker than that of the negative electrode current collector foil.
- the positive electrode tab 11a and the negative electrode tab 12a have different thicknesses and melting points. Specifically, the negative electrode tab 12a is formed thinner than the positive electrode tab 11a. In addition, the negative electrode tab 12a formed of copper or the like has a higher melting point than the positive electrode tab 11a formed of aluminum.
- the positive electrode tab 11a and the negative electrode tab 12a are provided in parallel so that the laser irradiation surface 11b and the laser irradiation surface 12b are flush with each other.
- the opposite surface 11c of the positive electrode tab 11a having a relatively low melting point is in the drawing than the opposite surface 12c of the negative electrode tab 12a having a relatively high melting point. It is provided in parallel with protruding downward.
- the positive electrode tab 11a and the negative electrode tab 12a correspond to a pair of plate materials.
- the laser cutting device 100 irradiates the condensed laser to the positive electrode tab 11a and the negative electrode tab 12a, melts them, and cuts them.
- the laser cutting device 100 includes a table 20 on which the stacked battery 10 is placed, a laser supply device 30 that supplies a laser, a processing head 40 that irradiates a laser, and an XY stage 50 that moves the processing head 40 in two directions. With.
- the table 20 has an upper surface 21 on which the stacked battery 10 is placed.
- the table 20 is formed in such a size as to hold only the laminate pack 15 when the stacked battery 10 is placed and the positive electrode tab 11a and the negative electrode tab 12a protrude outside.
- the laser supply device 30 includes a laser oscillator 31 that oscillates a laser and an optical fiber 32 that transmits the laser.
- the laser oscillator 31 outputs a fiber laser oscillated by the fiber itself.
- the laser oscillated from the laser oscillator 31 is a high energy density single mode fiber laser in which the energy distribution of the laser beam is a single mode.
- a single mode fiber laser is suitable for fine processing because of its high beam quality and excellent light condensing performance.
- the optical fiber 32 connects the laser oscillator 31 and the processing head 40.
- the laser oscillated by the laser oscillator 31 passes through the optical fiber 32 and is transmitted to the processing head 40.
- the processing head 40 includes a collimator lens 42 and a condensing lens 43 that are coaxially arranged inside a main body 41.
- the laser transmitted by the optical fiber 32 becomes a parallel light beam when passing through the collimator lens 42, and is condensed toward the focal point after passing through the condenser lens 43.
- a nozzle 44 is formed at the tip of the processing head 40, and the laser is irradiated from the nozzle 44 to the outside.
- the machining head 40 is held on an XY stage 50.
- the XY stage 50 has an X axis 51 that moves the machining head 40 in the width direction of the positive electrode tab 11a and the negative electrode tab 12a, and Y that moves the machining head 40 in the length direction of the positive electrode tab 11a and the negative electrode tab 12a.
- a shaft 52 A shaft 52.
- the machining head 40 when the machining head 40 is provided so as to be movable in the height direction, a movement error in the height direction of the machining head 40 may affect the focal position of the laser. Therefore, the machining head 40 is fixed so that it cannot move in the height direction. Thereby, the processing head 40 becomes a fixed optical system, and the focal position of the laser can be prevented from being shifted due to an error in movement of the processing head 40 in the height direction. Moreover, since it is not necessary to provide a mechanism for moving the machining head 40 in the height direction, the equipment can be simplified and the cost can be reduced.
- the laser cutting device 100 includes a gas supply device 60 that supplies assist gas sprayed coaxially with the laser to the positive electrode tab 11a and the negative electrode tab 12a.
- the gas supply device 60 includes a gas tank 61 that stores compressed high-pressure gas, and a pipe 62 that connects the gas tank 61 and the processing head 40.
- the gas tank 61 is filled with assist gas that assists laser cutting.
- the gas tank 61 is connected to the processing head 40 by a pipe 62 and supplies assist gas to the processing head 40.
- Assist gas here is compressed air.
- the assist gas is blown to the part to be laser-cut, and the melted and evaporated gas is blown off and removed. Thereby, it can suppress that a molten material adheres to a to-be-processed part.
- the assist gas is properly used depending on the material to be cut.
- oxygen, nitrogen, argon, or the like may be used.
- the stacked battery 10 is placed on the upper surface 21 of the table 20, and the laser irradiation surface 11b of the positive electrode tab 11a and the laser irradiation surface 12b of the negative electrode tab 12a are arranged side by side in parallel. (Plate material arrangement process # 101).
- the stacked battery 10 is formed so that the laser irradiation surface 11 b and the laser irradiation surface 12 b are flush with each other, the placement is completed only by placing the stacked battery 10 on the upper surface 21 of the table 20.
- the focus position of the laser irradiated from the processing head 40 is adjusted so as to coincide with the back surface 12c of the negative electrode tab 12a. That is, the focal position of the laser is adjusted to the back surface 12c opposite to the laser irradiation surface 12b in the thinner one of the positive electrode tab 11a and the negative electrode tab 12a (focus adjustment step # 102).
- the focal position of the laser can be adjusted by adjusting the fixed position of the processing head 40 in the optical axis direction (vertical direction in FIG. 2) or adjusting the fixed position of the condenser lens 43 in the optical axis direction.
- the processing head 40 is a fixed optical system. When the stacked battery 10 is placed on the upper surface 21 of the table 20, the focal position of the laser is aligned with the back surface 12c of the negative electrode tab 12a.
- the XY stage 50 is driven to move the processing head 40 in parallel. Specifically, the machining head 40 is moved while maintaining the focal position of the laser with respect to the positive electrode tab 11a and the negative electrode tab 12a.
- the output of the laser is set to 300 [W (Watt)].
- the machining head 40 moves in the direction of the X axis 51 to continuously laser-cut the positive electrode tab 11a and the negative electrode tab 12a (plate material cutting step # 103). Thereby, the positive electrode tab 11a and the negative electrode tab 12a are cut into a desired length.
- the assist gas is blown from the gas supply device 60 to the positive electrode tab 11a and the negative electrode tab 12a together with the laser irradiated from the processing head 40 (gas blowing step # 104).
- the positive electrode tab 11a and the negative electrode tab 12a are continuously laser-cut while keeping the supply conditions of the assist gas constant.
- the assist gas is supplied at a pressure of 1.5 [MPa].
- the melted metal (cutting product) melted by the irradiation of the laser on the positive electrode tab 11a and the negative electrode tab 12a is blown off by the assist gas. Therefore, it is suppressed that molten metal adheres to a cutting part.
- continuous laser cutting means that the positive electrode tab 11a and the negative electrode tab 12a are cut in a series of operations in which the laser output and the assist gas supply conditions are kept constant. It means that.
- the horizontal axis is the focal position [mm] of the laser when the laser irradiation surface 11b and the laser irradiation surface 12b are zero, and the vertical axis is the height [ ⁇ m] of the burr generated by laser cutting. is there.
- a one-dot chain line in FIG. 4 indicates a case where the focal position of the laser is ⁇ 0.2 [mm].
- the positive electrode tab 11a is formed thicker than the positive current collector foil, and the negative electrode tab 12a is formed thicker than the negative current collector foil. Therefore, when laser cutting the positive electrode tab 11a and the negative electrode tab 12a, burrs are more likely to occur than when laser cutting the positive electrode current collector foil and the negative electrode current collector foil.
- the two curves in the graph of FIG. 4 indicate the burr height [ ⁇ m] corresponding to the focal positions of the lasers of the positive electrode tab 11a and the negative electrode tab 12a, respectively.
- the positive electrode tab 11a has a minimum burr height and is minimized when the focal position of the laser is about 0 [mm] to ⁇ 0.5 [mm].
- the burr height of the negative electrode tab 12a is minimized when the focal position of the laser is about ⁇ 0.2 [mm].
- the focal point is at a position of -0.2 [mm], which is separated from the laser irradiation surface 12b by the thickness of the negative electrode tab 12a. . It can be seen from the graph of FIG. 4 that the burr height when the focal position of the laser is ⁇ 0.2 [mm] is suppressed to the minimum in both the positive electrode tab 11a and the negative electrode tab 12a.
- the burr height can be minimized with both the positive electrode tab 11a and the negative electrode tab 12a. Therefore, the positive electrode tab 11a and the negative electrode tab 12a having different thicknesses can be continuously laser-cut while keeping the focal position of the laser constant. Therefore, there is no need to change the laser cutting conditions during laser cutting, and the processing time of the positive electrode tab 11a and the negative electrode tab 12a having different thicknesses can be shortened.
- the positive electrode tab 11a suppresses the burr height within an allowable range when the focal position of the laser is in the range of ⁇ 0.6 [mm] to 0.4 [mm]. If the range is exceeded, the burr height increases rapidly and cannot be kept within the allowable range. If the burr height is not suppressed within an allowable range, the positive electrode tab 11a may not be cut. From this result, the tolerance of the focal position of the laser when the plate thickness of the positive electrode tab 11a is 0.4 [mm] (hereinafter referred to as “focal tolerance”) is ⁇ 0.6 [mm]. To 0.4 [mm], and the width of the focus latitude is 1.0 [mm].
- the negative electrode tab 12a suppresses the burr height within an allowable range when the focal position of the laser is in the range of ⁇ 0.4 [mm] to 0.2 [mm]. If the range is exceeded, the burr height increases rapidly and cannot be kept within the allowable range. If the burr height is not suppressed within an allowable range, the negative electrode tab 12a may not be cut. From this result, the focus tolerance when the thickness of the negative electrode tab 12a is 0.2 [mm] can be considered to be in the range of ⁇ 0.4 [mm] to 0.2 [mm]. The width of the focus latitude is 0.6 [mm].
- the width of the focus tolerance varies depending on the melting point and the plate thickness of the electrode tab. Specifically, the higher the melting point of the electrode tab and the thicker the plate thickness, the harder it is to cut, so the range of focus latitude becomes narrower.
- the width of the focal margin of the positive electrode tab 11a is wider than the width of the focal margin of the negative electrode tab 12a. Therefore, when laser cutting is performed within the range of the focus latitude of the negative electrode tab 12a, the plate thickness of the positive electrode tab 11a can be made thicker than the current 0.4 [mm].
- the width of the focal margin and the plate thickness are proportional, when the width of the focal margin of the positive electrode tab 11a is changed from 1.0 [mm] to 0.6 [mm]
- the thickness of the plate material having the lower melting point depends on the focus tolerance width of the plate material having the higher melting point.
- the maximum value can be set.
- the horizontal axis is the laser focal position [mm] when the laser irradiation surface 11b and the laser irradiation surface 12b are zero, and the vertical axis is the kerf width [ ⁇ m corresponding to the change of the laser focal position. ].
- the kerf width is the width of the portion cut by laser cutting, as shown in FIG. 5B.
- the plot in the graph of FIG. 5A shows the kerf width [mm] of the negative electrode tab 12a with respect to the focal position of the laser.
- the state where the focal position of the laser is 0 [mm] is a state where the focal position of the laser is aligned with the laser irradiation surface 12b of the negative electrode tab 12a.
- the kerf width is about 45 [ ⁇ m], which is relatively large.
- the kerf width is increased, it is considered that the scattered laser melts the negative electrode tab 12a more than necessary, and the cut surface becomes rough, so that the burr height increases.
- the focal position of the laser is ⁇ 0.2 [mm]
- the kerf width in the negative electrode tab 12a is minimized. This coincides with the case where the laser is focused on the opposite surface 12c of the negative electrode tab 12a. Therefore, the kerf width of the negative electrode tab 12a can be minimized by adjusting the focal position of the laser to the surface 12c opposite to the laser irradiation surface 12b of the negative electrode tab 12a.
- the horizontal axis represents the gas pressure [MPa] of the assist gas supplied by the gas supply device 60
- the vertical axis represents the maximum burr height [ ⁇ m] corresponding to the change in the gas pressure.
- an inert gas is more suitable for laser cutting of aluminum than oxygen gas, and oxygen gas is suitable for laser cutting of copper. Therefore, when continuously processing the positive electrode tab 11a made of aluminum and the negative electrode tab 12a made of copper, it is desirable to change the conditions such as the type and pressure of the assist gas in the middle.
- air compressed to a high pressure of at least 1.5 [MPa] or more is used as a single assist gas.
- the plot in the graph of FIG. 6 shows the maximum burr height [ ⁇ m] when the gas pressure is changed from 1.5 [MPa] to 2.0 [MPa].
- the white plot in the graph of FIG. 6 shows the maximum burr height of the positive electrode tab 11a made of aluminum, and the black plot shows the maximum burr height of the negative electrode tab 12a made of copper.
- the gas pressure is set to at least 1.5 [MPa] or more, the maximum burr height is suppressed in both the positive electrode tab 11a made of aluminum and the negative electrode tab 12a made of copper. I understand that. Therefore, even when compressed air is used as the assist gas, the generation of burrs in the negative electrode tab 12a, which is copper, can be suppressed.
- the positive electrode tab 11a and the negative electrode tab 12a can be continuously processed under the same conditions without changing the conditions of the assist gas.
- the processing time can be shortened and the equipment can be simplified.
- the running cost can be suppressed as compared with the case where noble gases are used.
- the laser focus is formed on the upper surfaces of the positive electrode tab 11a and the negative electrode tab 12a. Compared with the case where the positions are matched, laser scattering between the plate thicknesses of the positive electrode tab 11a and the negative electrode tab 12a is suppressed.
- the machining head 40 is moved by driving the XY stage 50.
- the machining head 40 may be fixed and the table 20 may be translated relative to the machining head 40. .
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Abstract
Description
Claims (7)
- 互いに厚さ及び融点が相違する一対の板材(11a,12a)にレーザを照射して切断するレーザ切断方法であって、
前記一対の板材(11a,12a)のうち融点が低い方の板材(11a)のレーザ照射面(11b)の反対面(11c)が、融点が高い方の板材(12a)のレーザ照射面(12b)の反対面(12c)よりも突出するように、前記一対の板材(11a,12a)を並べて配置する板材配置工程と、
レーザの焦点位置を、前記一対の板材(11a,12a)のうち融点が高い方の板材(12a)のレーザ照射面(12b)の反対面(12c)に合わせる焦点調整工程(#102)と、
レーザを照射し、前記一対の板材(11a,12a)に対するレーザの焦点位置を維持しながら前記一対の板材(11a,12a)を一連の動作で切断する板材切断工程(#103)と、
を備えるレーザ切断方法。 - 前記一対の板材(11a,12a)のうち融点が低い方の板材(11a)の板厚の最大値は、融点が高い方の板材(12a)の焦点裕度に応じて設定され、融点が高い方の板材(12a)の焦点裕度の幅が狭くなるほど、融点が低い方の板材(11a)の板厚の最大値は小さくなる請求項1に記載のレーザ切断方法。
- 前記一対の板材(11a,12a)のうち融点が低い方の板材(11a)はアルミニウム板であり、融点が高い方の板材(12a)は銅板であり、
融点が低い方の板材(11a)の板厚の最大値は、融点が高い方の板材(12a)の板厚の3.3倍に設定される請求項2に記載のレーザ切断方法。 - 前記焦点調整工程の前に、前記一対の板材(11a,12a)のそれぞれの前記レーザ照射面(11b,12b)を、面一になるように並べて配置する板材配置工程(#101)をさらに備える請求項1から請求項3までのいずれか1つに記載のレーザ切断方法。
- レーザによる切断を補助するために、レーザの照射と共にアシストガスを前記一対の板材(11a,12a)に吹き付けるガス吹付工程(#104)を更に備え、
前記一対の板材(11a,12a)は、前記アシストガスを供給した状態で、連続的に切断される請求項1から請求項4までのいずれか1つに記載のレーザ切断方法。 - 前記一対の板材(11a,12a)は、前記アシストガスの供給条件を一定に保ったまま連続的に切断される請求項5に記載のレーザ切断方法。
- 前記一対の板材(11a,12a)のうち融点が低い方の板材(11a)は、積層型電池(10)の正極電極タブ(11a)であり、融点が高い方の板材(12a)は前記積層型電池(10)の負極電極タブ(12a)であり、
前記正極電極タブ(11a)及び前記負極電極タブ(12a)は、前記積層型電池(10)の電極を形成する集電箔よりも厚く形成される請求項1から請求項6までのいずれか1つに記載のレーザ切断方法。
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