JP7272041B2 - LASER CUTTING METHOD AND LASER CUTTING DEVICE - Google Patents

Description

The present invention relates to a laser cutting method and a laser cutting apparatus.

Conventionally, there has been known a laser cutting method for cutting a member to a desired length with a laser beam. For example, Patent Literature 1 discloses a technique for cutting an elongated electrode sheet wound in a roll shape along the conveying direction of the electrode sheet. Patent Literature 2 discloses a technique for cutting an electrode sheet in a direction perpendicular to the conveying direction of the electrode sheet, that is, in the width direction of the electrode sheet.

JP 2018-89667 A JP 2015-24416 A

In the laser cutting method described in Patent Document 1, the electrode sheet is irradiated with a laser beam whose irradiation position is fixed, so that a melted portion is formed by absorption of the laser beam along the conveying direction of the electrode sheet. is generated. The electrode sheet is cut by removing the melted portion by the gas jetted by an air blower having a fixed gas jetting position. However, in the laser cutting method described in Patent Literature 1, since both the irradiation position of the laser beam and the position where the gas is jetted are fixed, the cutting direction of the electrode sheet is limited.

On the other hand, in the laser cutting method described in Patent Document 2, since the electrode sheet is cut in the direction perpendicular to the electrode sheet conveying direction, the irradiation position of the laser light changes the width of the electrode sheet each time the electrode sheet is cut. It will move in the direction Therefore, the injection position of the gas for removing the melted portion also moves according to the irradiation position of the laser beam. However, in consideration of productivity, the moving speed of the laser beam irradiation position may be, for example, 1 m/sec. etc. is difficult to move at the same speed. For this reason, the jet of gas cannot keep up and the melted portion cannot be completely removed, which may deteriorate the quality of the cut surface of the cut member.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a technique for improving the quality of cut members in a laser cutting method.

The present invention has been made to solve at least part of the above problems, and can be implemented as the following modes.

(1) According to one aspect of the present invention, there is provided a laser cutting method for cutting a sheet member with a laser beam. In this laser cutting method, an arranging step of arranging a slit capable of injecting or sucking gas into the sheet member being conveyed in a direction not parallel to a planned cutting line of the sheet member; and a cutting step of injecting or sucking gas from the slit while irradiating the overlapping position with the laser beam.

According to this configuration, in the cutting step, when the laser beam is applied to the position where the non-parallel slit and the intended cutting line overlap, the portion of the sheet member corresponding to the overlapped position melts. At this time, since the melted portion is removed from the sheet member by the pressure of the gas injected or sucked from the slit, a space penetrating the sheet member in the thickness direction is formed, and dross, spatter, etc. generated in the sheet member are removed. Foreign matter is removed without reattaching to the sheet member. When the sheet member is conveyed, the position where the slit overlaps the planned cutting line moves, and the space that passes through the sheet member is separated from the slit. At the slit newly overlapped with the line, gas is injected or aspirated to remove the newly melted area from the irradiation of the laser light. In this way, by continuously moving the position where the slit overlaps with the planned cutting line, the sheet member is continuously melted along the planned cutting line and the melted portion is removed, thereby cutting the sheet member. disconnected. As a result, the gas flows in the order of melting, so foreign matter such as dross and spatter can be removed from the cut surface without reattaching to the sheet member. Therefore, the quality of the cut piece cut from the sheet member and the cut surface of the cut sheet member can be improved.

(2) In the laser cutting method of the above aspect, in the cutting step, the laser beam may be irradiated from the slit toward the sheet member while injecting gas from the slit. According to this configuration, when the sheet member is irradiated with laser light directed from the slit toward the sheet member, the gas is jetted from the slit toward the sheet member. It can be removed by force. Thereby, the quality of the cut piece cut from the sheet member and the cut surface of the cut sheet member can be improved.

(3) In the laser cutting method of the above aspect, in the cutting step, the surface of the sheet member opposite to the surface facing the slit is irradiated with the laser beam, and gas is sucked from the slit. good too. According to this configuration, when the sheet member is irradiated with the laser beam, gas is sucked from the slit facing the surface of the sheet member opposite to the surface irradiated with the laser beam. can be removed by the entraining force of the gas. Thereby, the quality of the cut piece cut from the sheet member and the cut surface of the cut sheet member can be improved.

(4) In the laser cutting method of the above aspect, in the arranging step, the slits are arranged so as to face both surfaces of the sheet member, and in the cutting step, the sheet member is irradiated with the laser beam. Even if the laser beam is irradiated while injecting the gas from the slit facing the surface and sucking the gas from the slit facing the surface of the sheet member opposite to the surface irradiated with the laser beam. good. According to this configuration, in the cutting step, the gas is injected and sucked from the two slits arranged on both sides of the sheet member while irradiating the laser beam. As a result, the portion melted by the pushing force and the pulling force of the gas flowing through the two slits can be removed without reattaching to the sheet member. As a result, the quality of the cut piece cut from the sheet member and the cut surface of the cut sheet member can be further improved.

(5) In the laser cutting method of the above aspect, in the cutting step, the laser beam may be applied while changing the conveying speed of the sheet member. According to this configuration, the shape of the cut piece obtained by cutting the sheet member can be made into an arbitrary shape. Therefore, it is possible to improve the degree of freedom in the shape of the cut piece.

(6) In the laser cutting method of the above aspect, the sheet member contains at least one of copper and aluminum, and the cut piece obtained by cutting the sheet member in the pre-cutting step is an electrode used in a secondary battery. good. According to this configuration, it is possible to improve the quality of the electrode of the secondary battery, which is the cut piece cut from the sheet member, so that deterioration of the performance of the secondary battery can be suppressed.

(7) According to another aspect of the present invention, there is provided a laser cutting device that cuts a sheet member with a laser beam. This laser cutting device includes a conveying unit that conveys the sheet member, and is provided in proximity to the sheet member conveyed by the conveying unit, and is arranged in a direction not parallel to a planned cutting line of the sheet member. A gas circulating portion formed with a slit that can be sucked, and a laser irradiation portion that irradiates the laser beam onto a position where the slit overlaps with the intended cutting line of the sheet member. According to this configuration, the portion of the sheet member corresponding to the position where the non-parallel slit and the planned cutting line overlap is melted. At this time, since the melted portion is removed from the sheet member by the pressure of the gas injected or sucked from the slit, a space penetrating the sheet member in the thickness direction is formed, and dross and spatter are generated in the sheet member. foreign matter can be removed without reattaching to the sheet member. By continuously moving the position where the slit and the planned cutting line overlap, the sheet member is continuously melted along the planned cutting line and the melted portion is removed, so that the sheet member is cut. be done. As a result, the gas flows in order through the newly formed through space, so foreign matter such as dross is removed from the cut surface, and the generated spatter can be removed without re-adhering to the sheet member. Therefore, the quality of the cut piece cut from the sheet member and the cut surface of the cut sheet member can be improved.

The present invention can be implemented in various aspects, for example, a system including a laser cutting device, a control method for these devices and systems, a computer program for executing a laser cutting method in these devices and systems, It can be realized in the form of a server device for distributing a computer program, a non-temporary storage medium storing the computer program, or the like.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows schematic structure of the laser cutting apparatus of 1st Embodiment. FIG. 4 is a schematic diagram of the gas injection unit viewed from the side where the slit is formed; It is a flow chart which shows a laser cutting method. It is an explanatory view explaining a position which irradiates a laser beam first. FIG. 4 is a schematic diagram showing a state in which the edge of the sheet member is cut; FIG. 6 is a schematic diagram showing a state when a sheet member is conveyed from the state of FIG. 5; It is a schematic diagram which shows the state by which the laser beam was irradiated from end to end of the planned cutting line. It is a schematic diagram which shows schematic structure of the laser cutting apparatus of 2nd Embodiment. It is a schematic diagram which shows schematic structure of the laser cutting apparatus of 3rd Embodiment.

<First embodiment>
FIG. 1 is a schematic diagram showing a schematic configuration of a laser cutting device 1 according to the first embodiment. FIG. 2 is a schematic diagram of the gas injection unit 20 viewed from the side where the slits 24 are formed. The laser cutting device 1 of the first embodiment cuts the sheet member 5 formed in a long thin sheet shape in the width direction of the sheet member 5 .

In this embodiment, the sheet member 5 is a copper foil having a thickness of about 10 μm and having a metal oxide containing lithium applied as an active material to a thickness of about 100 μm on one or both sides thereof. When the sheet member 5 is cut into a predetermined length by the laser cutting device 1, it is used as a negative electrode for a lithium ion secondary battery. Note that the sheet member 5 cut by the laser cutting device 1 is not limited to this. The sheet member 5 is, for example, an aluminum foil having a thickness of about 10 μm coated with conductive graphite of about 100 μm as an active material on one or both sides thereof. It may be used as an electrode for the positive electrode of a battery. Further, the sheet member 5 is formed by laminating a plurality of electrodes formed in the shape of a long thin sheet with a separator formed in the shape of a long thin sheet interposed therebetween. It may be a member. The laser cutting device 1 includes conveying rollers 12 and 13 , a gas injection section 20 , a laser irradiation section 30 , a gas supply section 40 and a control section 50 .

Conveyance rollers 12 and 13 are provided so as to contact one surface 6 of sheet member 5 . Conveying rollers 12 and 13 convey the sheet member 5 pulled out from the electrode sheet roll 11 on which the sheet member 5 is wound in a roll shape at a constant speed, for example, 1 m/s, in the direction of the outline arrow F1. do.

The gas injection part 20 is provided at a position close to the other surface 7 of the sheet member 5 conveyed by the conveying rollers 12 and 13 . In addition, the gas injection part 20 may or may not be in contact with the sheet member 5 . The gas injection part 20 is a rectangular parallelepiped block having an internal space 21 , and has outer walls 20 a and 20 b , a laser beam transmission window 22 , a gas inlet 23 and a slit 24 . The outer wall 20a is arranged at a position closest to the sheet member 5 in the gas injection section 20, and is provided with a slit 24. As shown in FIG. The outer wall 20b is arranged at a position facing the outer wall 20a, and is provided with a laser light transmitting window 22. As shown in FIG. The laser light transmission window 22 is made of quartz through which the laser light emitted from the laser irradiation section 30 is transmitted. The gas inlet 23 is an opening formed in the outer wall of the gas injection section 20 and connected to the gas supply section 40 .

The slit 24 is formed so as to be inclined with respect to the conveying direction F1 of the sheet member 5, as shown in FIG. Here, as shown in FIG. 2, assuming that the planned cutting line along which the sheet member 5 is cut is C1, and the center line of the slit 24 is C2, the laser cutting method of the present embodiment is: The slit 24 is arranged so that the planned cutting line C1 and the center line C2 form an angle of 45 degrees. The slit 24 is formed so that the length in the direction along the planned cutting line C1 is approximately the same as the length of the planned cutting line C1 of the sheet member 5 . That is, as shown in FIG. 2, the slit 24 is formed so as to cover the sheet member 5 when the slit 24 is viewed from the one surface 6 side of the sheet member 5 . The slit 24 injects gas supplied to the space 21 by a gas supply unit 40, which will be described later.

The laser irradiation section 30 is arranged on the side opposite to the sheet member 5 with respect to the gas injection section 20 . The laser irradiation section 30 includes a laser oscillation section 31 and a galvanometer scanner section 32 . The laser oscillation unit 31 oscillates laser light for cutting the sheet member 5 . In this embodiment, the laser oscillation unit 31 is, for example, a fiber laser, and oscillates laser light with a wavelength of 1 μm and a pulse width of several hundred nanoseconds or less.

The laser oscillation unit 31 emits an oscillated laser beam toward the galvanometer scanner unit 32 as indicated by a two-dot chain line L1 in FIG. The galvanometer scanner unit 32 has a condenser lens, a galvanometer mirror, and a motor for driving the galvanometer mirror (not shown). The laser beam incident on the galvanometer scanner unit 32 is condensed by a condensing lens and then adjusted in the direction of emission by a galvanometer mirror. 5 toward the other surface 7 .

The gas supply unit 40 has a gas cylinder that supplies pressurized gas to the space 21 of the gas injection unit 20 . In the present embodiment, oxygen is supplied in consideration of cutting the sheet member 5 by also utilizing the reaction with the material forming the sheet member 5 . The oxygen supplied by the gas supply unit 40 enters the space 21 through the gas inlet 23 and is jetted from the slit 24 toward the sheet member 5 (white arrow F2 in FIG. 1). The gas supplied to the space 21 by the gas supply unit 40 may be air, nitrogen, or the like. Moreover, the gas supply part 40 may be a compressor when supplying air.

The control unit 50 is a computer including a ROM, a RAM, and a CPU. The control unit 50 is electrically connected to the transport rollers 12 and 13, the laser irradiation unit 30, and the gas supply unit 40. As shown in FIG. The control unit 50 controls the feeding speed of the sheet member 5 by the conveying rollers 12 and 13 and controls the irradiation position and irradiation timing of the laser light by the laser irradiation unit 30 according to a program input in advance. The control unit 50 also controls the amount of oxygen supplied by the gas supply unit 40 .

Next, details of the laser cutting method of the present embodiment will be described. The laser cutting method of this embodiment is a method of cutting the sheet member 5 being conveyed by the conveying rollers 12 and 13 to a predetermined length, and is a cutting process of the sheet member 5 by the operator of the laser cutting device 1. can be executed by the start instruction of

FIG. 3 is a flow chart showing a laser cutting method in the laser cutting device 1. As shown in FIG. FIG. 4 is an explanatory diagram for explaining the position where the laser beam is first irradiated in the laser cutting method. First, as an arrangement step, the slit 24 of the gas injection unit 20 is arranged in a direction not parallel to the planned cutting line C1 of the sheet member 5 being conveyed (step S1). In step S<b>1 , the gas injection section 20 is arranged so that the outer wall 20 a is close to the other surface 7 of the sheet member 5 . At this time, as shown in FIG. 4 , the gas injection section 20 is arranged so that the slit 24 is arranged at a position inclined with respect to the planned cutting line C1 of the sheet member 5 .

Next, as a cutting step, oxygen is injected from the slit 24 while irradiating a laser beam to the position where the slit 24 and the planned cutting line C1 overlap (step S2). Specifically, as shown in FIG. 4, when the position of one end side of the center line C2 of the slit 24 is position P1 and the position of the other end side is position P2, the slit 24 and the cutting plan are in the state of FIG. The sheet member 5 is irradiated with laser light through the laser light transmission window 22 and the slit 24 at the position P1 where the lines C1 overlap. A portion of the sheet member 5 irradiated with the laser beam, which corresponds to the position P1, absorbs the laser beam and melts.

FIG. 5 is a schematic diagram showing a state in which the edge of the sheet member 5 is cut by laser light. That is, FIG. 5 shows the next state of FIG. The portion of the sheet member 5 melted by the absorption of the laser light is blown away by the oxygen injected from the slit 24 in the direction in which the laser light is irradiated, that is, the side where the conveying rollers 12 and 13 are positioned when viewed from the sheet member 5. . As a result, the sheet member 5 is penetrated in the thickness direction, and as shown in FIG. 5, the end portion is cut (the portion indicated by the solid arrow A1 in FIG. 5). At this time, the dross generated by melting on the cut surface of the sheet member 5 is blown away by the oxygen passing through the slit 24 toward the side where the conveying rollers 12 and 13 are positioned as viewed from the sheet member 5 . On the other hand, in the state of FIG. 5, oxygen is also supplied to the majority 24a of the slit 24, but since the slit 24 is covered with the sheet member 5, it is difficult for oxygen to be injected.

FIG. 6 is a schematic diagram showing a state where the sheet member 5 is advanced by the distance D shown in FIG. 6 by the conveying rollers 12 and 13 from the state shown in FIG. That is, FIG. 6 shows the next state of FIG. When the sheet member 5 advances in the direction of the white arrow F1 from the state of FIG. to move. FIG. 6 shows an intermediate state. In the laser cutting device 1, the galvanometer scanner unit 32 scans the irradiation position of the laser light so that the irradiation position of the laser light on the sheet member 5 is the position where the slit 24 and the planned cutting line C1 overlap. As a result, the sheet member 5 corresponding to the position where the slit 24 and the planned cutting line C1 overlap is irradiated with the laser light, so that the sheet member 5 is cut along the planned cutting line C1.

Furthermore, when the sheet member 5 is penetrated in the thickness direction by laser light irradiation, oxygen is injected from a part of the slit 24 corresponding to the penetrated portion. On the other hand, since the part 24b of the slit 24 which has already overlapped with the planned cutting line C1 is covered with the sheet member 5, it is difficult to inject oxygen. Further, in the state of FIG. 6, since the part 24c of the slit corresponding to the portion where the sheet member 5 is not cut is also covered with the sheet member 5, it is difficult to inject oxygen.

FIG. 7 is a schematic diagram showing a state in which a laser beam is irradiated from end to end of the planned cutting line C1. That is, FIG. 7 shows the next state of FIG. In FIG. 7 , the position where the slit 24 and the planned cutting line C1 overlap is the position P2 on the center line C2 of the slit 24 . When the position where the slit 24 and the planned cutting line C1 overlap becomes the position P2, the laser beam moves from the position P1 to the position P2 on the planned cutting line C1, and one cut piece 5a is cut from the sheet member 5. It has been done. That is, the cut piece 5a becomes a member cut to a desired length.

According to the laser cutting method of the present embodiment described above, the arrangement step of arranging the slit 24 in a direction not parallel to the planned cutting line C1 and the position where the slit 24 and the planned cutting line C1 overlap are irradiated with a laser beam. and a cutting step of injecting oxygen from the slit 24 . As a result, in the cutting step, when the laser beam is irradiated to the position where the slit 24 arranged in a non-parallel state and the planned cutting line C1 overlap, the part of the sheet member 5 corresponding to the overlapped position melts. At this time, since the melted portion is removed from the sheet member 5 by the pressure of the oxygen injected from the slit 24, a space penetrating the sheet member 5 in the thickness direction is formed, and dross generated in the sheet member 5 is removed. Foreign matter such as spatter is removed without adhering to the sheet member 5 again. . When the sheet member 5 is conveyed, the overlapping position of the slit 24 and the planned cutting line C1 moves, and the penetrated space is separated from the slit 24, so that oxygen is hardly jetted from the slit 24 which does not overlap with the penetrated space. However, in the slit 24 newly overlapping with the planned cutting line C1, oxygen is injected to remove the portion newly melted by the irradiation of the laser beam. In this way, by continuously moving the position where the slit 24 and the planned cutting line C1 overlap, the melting of the sheet member 5 along the planned cutting line C1 and the removal of the melted portion are continuously performed. , the sheet member 5 is cut. As a result, oxygen flows in the order of melting, so foreign matter such as dross and spatter can be removed from the cut surface without reattaching to the sheet member 5 . Therefore, the quality of the cut piece 5a cut from the sheet member 5 and the cut surface of the cut sheet member 5 can be improved.

Further, according to the laser cutting method of the present embodiment, in the cutting step, laser light is irradiated from the slit 24 toward the sheet member 5 while oxygen is injected from the slit 24 . As a result, when the sheet member 5 is irradiated with laser light directed toward the sheet member 5 from the slit 24, oxygen is jetted toward the sheet member 5 from the slit 24. can be removed by the pushing force of Thereby, the quality of the cut piece 5a cut from the sheet member 5 and the cut surface of the cut sheet member 5 can be improved.

Further, according to the laser cutting method of the present embodiment, the sheet member 5 contains copper, and the cut piece obtained by cutting the sheet member 5 in the cutting process serves as an electrode for use in a secondary battery. As a result, the quality of the electrode of the secondary battery, which is the cut piece cut from the sheet member 5, can be improved, so that deterioration of the performance of the secondary battery can be suppressed.

<Second embodiment>
FIG. 8 is a schematic diagram showing the schematic configuration of the laser cutting device of the second embodiment. The laser cutting device of the second embodiment differs from the laser cutting device of the first embodiment (FIG. 1) in that a decompression pump is provided instead of the gas injection section.

The laser cutting device 2 of this embodiment includes conveying rollers 14 and 15 , a gas suction unit 60 , a laser irradiation unit 30 , a decompression pump 70 and a control unit 50 . Conveying rollers 14 and 15 are provided so as to contact the other surface 7 of the sheet member 5, and convey the sheet member 5 in the direction of the outline arrow F1 at a constant speed.

The gas suction unit 60 is provided at a position close to one surface 6 of the sheet member 5 fed by the conveying rollers 14 and 15 . The gas suction part 60 may or may not be in contact with the sheet member 5 . The gas suction part 60 is a rectangular parallelepiped block having a space 61 inside, and has an outer wall 60 b , a gas outlet 63 and a slit 64 . The outer wall 60b is located closest to the sheet member 5 in the gas suction section 60, and is provided with a slit 64. As shown in FIG. The gas outlet 63 is an opening formed in the outer wall of the gas suction section 60 and connected to the decompression pump 70 . The slit 64 is formed so as to be inclined with respect to the conveying direction F1 of the sheet member 5 . The slit 64 is formed so that the length of the sheet member 5 in the direction along the planned cutting line C<b>1 is approximately the same as the length of the planned cutting line C<b>1 of the sheet member 5 . The slit 64 sucks gas by reducing the pressure in the space 61 by a pressure reducing pump 70, which will be described later.

The decompression pump 70 has a function of decompressing the space 61 of the gas suction section 60 . The decompression pump 70 is electrically connected to the controller 50 . The decompression pump 70 decompresses the space 61 when driven according to a command from the control unit 50 . When the space 61 is decompressed, the gas suction unit 60 sucks the external gas through the slit 64 (white arrow F3 in FIG. 8).

In the laser cutting method of the present embodiment, the gas suction part 60 is arranged so that the outer wall 60b is close to one surface 6 of the sheet member 5 in the arrangement step. At this time, the gas suction unit 60 is arranged so that the slit 64 is arranged at a position inclined with respect to the planned cutting line C<b>1 of the sheet member 5 .

Next, in the cutting step, gas is sucked from the slit 64 while irradiating a laser beam on the position where the slit 64 and the planned cutting line C1 overlap. As a result, the portion of the sheet member 5 melted by the absorption of the laser light is located in the direction in which the laser light is irradiated by the flow of the gas sucked from the slit 64, that is, the gas suction portion 60 is positioned when viewed from the sheet member 5. sucked to the side. As a result, the sheet member 5 is penetrated in the thickness direction and cut.

According to the laser cutting method of the present embodiment described above, in the cutting step, while irradiating the other surface 7 of the sheet member 5 with a laser beam, the slits 64 arranged on the one surface 6 of the sheet member 5 are cut. suck air from As a result, the portion melted by the irradiation of the laser beam can be removed by the pulling force of the gas. Thereby, the quality of the cut piece 5a cut from the sheet member 5 and the cut surface of the cut sheet member 5 can be improved.

<Third Embodiment>
FIG. 9 is a schematic diagram showing the schematic configuration of the laser cutting device of the third embodiment. Compared with the laser cutting apparatus of the first embodiment (FIG. 1), the laser cutting apparatus of the third embodiment is provided with a gas suction section on the opposite side of the member to which the laser beam is irradiated. is different.

The laser cutting device 3 of the present embodiment includes conveying rollers 12 and 14, a gas injection unit 20, a gas suction unit 60, a laser irradiation unit 30, a gas supply unit 40, a pressure reducing pump 70, and a control unit 50. Prepare.

In the laser cutting method of the present embodiment, the gas injection section 20 and the gas suction section 60 are provided to the sheet member 5 in the placement step. Specifically, while the outer wall 20a of the gas injection part 20 is close to the other surface 7 of the sheet member 5, the slit 24 is arranged at a position inclined with respect to the planned cutting line C1 of the sheet member 5. A gas injection part 20 is arranged. Further, the outer wall 60b of the gas suction portion 60 is arranged close to one surface 6 of the sheet member 5, and the slit 64 is arranged at a position inclined with respect to the planned cutting line C1 of the sheet member 5. 60 is placed. At this time, the slit 24 and the slit 64 are arranged so as to be inclined at the same angle with respect to the planned cutting line C1.

Next, in the cutting step, the position where the slit 24 , the planned cutting line C<b>1 and the slit 64 overlap is irradiated with laser light, oxygen is injected from the slit 24 , and gas is sucked from the slit 64 . As a result, the portion of the sheet member 5 melted by the absorption of the laser beam moves toward the one surface 6 side as viewed from the sheet member 5 due to the injection of oxygen from the slit 24 and the suction of gas from the slit 64. The sheet member 5 is penetrated and cut in the thickness direction.

According to the laser cutting method of the present embodiment described above, in the cutting step, gas is injected and sucked from the two slits 24 and 64 arranged on both sides of the sheet member 5 while irradiating the laser beam. As a result, the melted portion can be removed by the pushing force and the pulling force of the gas flowing through the two slits without being reattached to the sheet member 5 . Thereby, the quality of the cut piece 5a cut from the sheet member 5 and the cut surface of the cut sheet member can be further improved.

<Modification of this embodiment>
The present invention is not limited to the above-described embodiments, and can be implemented in various aspects without departing from the scope of the invention. For example, the following modifications are possible.

[Modification 1]
In the above-described embodiment, in the cutting process, the conveying rollers 12 and 13 convey the sheet member 5 at a constant speed in the direction of the outline arrow F1. However, the speed at which the sheet member 5 is conveyed in the cutting process is not limited to this. The laser beam may be irradiated while changing the conveying speed of the sheet member 5 . Thereby, the shape of the cut piece 5a obtained by cutting the sheet member 5 can be made into an arbitrary shape. Therefore, the degree of freedom of the shape of the cut piece 5a can be improved.

[Modification 2]
In the above-described embodiment, the laser cutting method cuts the electrode sheet for the lithium ion secondary battery. However, the sheet member to which the laser cutting method is applied is not limited to this. Any member may be used as long as it is formed in a sheet shape.

The present aspect has been described above based on the embodiments and modifications, but the above-described embodiments are intended to facilitate understanding of the present aspect, and do not limit the present aspect. This aspect may be modified and modified without departing from its spirit and scope of the claims, and this aspect includes equivalents thereof. Also, if the technical features are not described as essential in this specification, they can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 1, 2, 3... Laser cutting apparatus 5... Sheet member 5a... Cut piece 6... One side 7... The other side 11... Electrode sheet roll 12, 13, 14, 15... Conveyance roller 20... Gas injection part 20a, 20b , 60b... Outer wall 21, 61... Space 22... Laser light transmission window 23... Gas inlet 24, 64... Slit 30... Laser irradiation unit 31... Laser oscillation unit 32... Galvano scanner unit 40... Gas supply unit 50... Control unit 60... Gas suction unit 63 Gas outlet 70 Decompression pump C1 Planned cutting line C2 Center line F1 Conveying direction

Claims (7)

A laser cutting method for cutting a sheet member with a laser beam,
an arranging step of arranging a slit capable of sucking gas in the sheet member being conveyed in a direction not parallel to a planned cutting line of the sheet member;
a cutting step of applying the laser beam to a position where the slit and the planned cutting line overlap on the surface opposite to the surface facing the slit of the sheet member, and sucking gas from the slit. ,
Laser cutting method. A laser cutting method for cutting a sheet member with a laser beam ,
An arrangement step of arranging slits capable of injecting or sucking air into the sheet member being conveyed in a direction not parallel to a planned cutting line of the sheet member, wherein the slits are opposed to both surfaces of the sheet member. an arrangement step of arranging so as to
A cutting step of injecting or sucking gas from the slit while irradiating the laser beam to the position where the slit and the planned cutting line overlap, wherein the surface of the sheet member facing the laser beam is irradiated. A cutting step of irradiating the laser beam while injecting the gas from the slit and sucking the gas from the slit facing the surface of the sheet member opposite to the surface irradiated with the laser beam; comprising
Laser cutting method. A laser cutting method for cutting a sheet member with a laser beam ,
an arrangement step of arranging a slit capable of injecting or sucking gas into the sheet member being conveyed in a direction not parallel to a planned cutting line of the sheet member;
A cutting step in which gas is injected or sucked from the slit while irradiating the laser beam at a position where the slit and the planned cutting line overlap, wherein the laser beam is emitted while changing the conveying speed of the sheet member. irradiating and cutting,
Laser cutting method. The laser cutting method according to any one of claims 1 to 3 ,
The sheet member contains at least one of copper and aluminum,
The cut piece obtained by cutting the sheet member in the cutting step is an electrode used in a secondary battery,
Laser cutting method. A laser cutting device for cutting a sheet member with a laser beam,
a conveying unit that conveys the sheet member;
a gas circulating unit provided in proximity to the sheet member conveyed by the conveying unit and having a slit arranged in a direction not parallel to a planned cutting line of the sheet member and capable of sucking gas;
a laser irradiation unit that irradiates the laser beam at a position where the slit and the planned cutting line of the sheet member overlap on the surface opposite to the surface facing the slit of the sheet member,
Laser cutting equipment. A laser cutting device for cutting a sheet member with a laser beam,
a conveying unit that conveys the sheet member;
Slits provided in proximity to the sheet member conveyed by the conveying unit and arranged in a direction not parallel to a planned cutting line of the sheet member are formed so as to face both surfaces of the sheet member. a distribution department;
a laser irradiation unit that irradiates the laser beam at a position where the slit and the planned cutting line of the sheet member overlap,
The gas circulation part injects gas from the slit facing the surface of the sheet member irradiated with the laser beam, and sprays the gas onto the surface of the sheet member opposite to the surface irradiated with the laser beam. sucking gas from the opposing slits;
Laser cutting equipment. A laser cutting device for cutting a sheet member with a laser beam,
a conveying unit for conveying the sheet member , the conveying unit being capable of changing the conveying speed of the sheet member;
a gas circulation unit provided in proximity to the sheet member conveyed by the conveying unit, and having a slit arranged in a direction not parallel to the planned cutting line of the sheet member and capable of injecting or sucking gas;
a laser irradiation unit capable of irradiating the laser beam onto a position where the slit and the planned cutting line of the sheet member overlap;
A control unit that controls the conveying unit and the laser irradiation unit,
The control unit controls the conveying unit and the laser irradiation unit so as to irradiate the laser beam while changing the conveying speed of the sheet member.
Laser cutting equipment.

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