JP2023064393A - Laser cutting device and laser cutting method - Google Patents

Abstract

To provide a laser cutting device which has the simplified entire structure and control and can stably cut a belt-like body into cut pieces in a rectangular shape or a square shape with laser processing, and a laser cutting method.SOLUTION: There is provided a laser cutting device which cuts a belt-like body delivered from a belt-like body supply source into cut pieces in a rectangular shape or a square shape with laser processing. The laser cutting device comprises: a laser processing machine; a rotary drum of a polygonal column body in which the outer diameter surface is made of a plurality of flat surfaces; drive means which rotates the rotary drum around an axial center line; control means for a rotary drum which controls the drive means; and control means for a laser processing machine which controls the laser processing of the laser processing machine. When the rotation of the rotary drum is stopped in a case where one flat surface of the outer diameter surface of the rotary drum comes to a prescribed position, the laser processing machine performs laser processing control on the belt-like body.SELECTED DRAWING: Figure 1

Description

The present invention relates to a laser cutting apparatus and a laser cutting method, and more particularly, to a laser cutting apparatus and a laser cutting apparatus for cutting a belt-shaped body into rectangular or square cut pieces (for example, a positive electrode plate or a negative electrode plate) by laser processing. It relates to a laser cutting method.

As a type of lithium-ion secondary battery, there is one in which an electrode laminate is formed by laminating a positive electrode plate and a negative electrode plate facing each other with a separator that is an insulator sandwiched therebetween (Patent Document 1 and Patent Reference 2).

That is, as shown in FIG. 17, the electrode laminate is obtained by zigzag-folding a belt-shaped separator 1 while sequentially forming a negative electrode accommodating portion 2 and a positive electrode accommodating portion 3 that are open in opposite directions. 2 is inserted into the negative electrode plate 4 , and the positive electrode plate 5 is inserted into the positive electrode accommodating portion 3 . Tabs 4a and 5a are attached to the negative electrode plate 4 and the positive electrode plate 5, respectively.

The negative electrode plate 4 and the positive electrode plate 5 are manufactured, for example, by the manufacturing method and apparatus described in Patent Document 1. In the manufacturing method described in Patent Document 1, the ear part is cut off from the long raw material at the ear part separation position with the first laser beam, and the edge part is cut in the cutting area downstream from the ear part separation position. A second laser beam cuts the electrode portion at predetermined intervals to continuously form an electrode sheet with tabs (negative electrode plate 4 or positive electrode plate 5). It collects the parts.

Also, when cutting the original fabric with the second laser beam, the original fabric 8 is sucked by the take-up unit 10 . As the take-up unit 10, one having a structure shown in FIG. 18 has been proposed. The take-up unit 10 includes a cylindrical fixed drum 11 and a rotary cylinder 12 that rotates around the fixed drum 11 . A plurality of ventilation holes 13 are provided in the rotating cylinder 12, and a negative pressure space 14 and a positive pressure space 15 are formed between the outer peripheral surface of the fixed drum 11 and the inner diameter surface of the rotating cylinder 12. ing. In this case, the negative pressure space 14 and the positive pressure space 15 are formed by forming the concave portion 11a for the negative pressure space and the concave portion 11b for the positive pressure space on the outer diameter surface of the fixed drum 11 . A ventilation hole 13 is communicated with the rotary cylinder 12 . A laser running recessed groove 16 is formed on the outer diameter surface of the rotary cylinder 12 .

In addition, on the upstream side of the take-up section 10, rolls 17a and 17b for feeding original fabrics are arranged, and on the downstream side of the take-up section 10, take-up rollers 18a and 18b are arranged. Also, L1 and L1' in FIG. 18 indicate the first laser beams, and L2 indicates the second laser beam.

The original fabric 8 delivered from the original fabric delivery rollers 17a and 17b is sucked through the ventilation hole 13 and adheres to the outer diameter surface of the rotating cylinder 12 in the negative pressure space corresponding portion. Then, the raw fabric 8 is separated at the selvages 8b, 8b by the first laser beams L1, L2, and conveyed downstream by the take-up rollers 18a, 18b. On the take-up portion 10, the tabbed electrode sheet 19 is cut out by the second laser beam L2, and the rotating cylinder 12 rotates (arrow A When the electrode sheet 19 reaches the portion corresponding to the positive pressure space, the electrode sheet 19 is released from the adsorption, separated from the rotating cylinder 12, and discharged in the direction of arrow B. It is supplied to the electrode sheet recovery section 20 .

For this reason, in the method and apparatus for manufacturing an electrode sheet with lobes described in Patent Document 1, electrode sheets 19 as products are sequentially collected by the electrode sheet collecting section 20 .

WO2017/119011

By the way, when using the take-up unit 10 as shown in FIG. Therefore, when cutting the material 8 in a direction perpendicular to its traveling direction (longitudinal direction of the material), it is necessary to perform control to shift the irradiation of the second laser beam L2 along with this traveling. That is, it is necessary to shift the irradiation of the laser beam L2 in the longitudinal direction of the original fabric along the direction orthogonal to the longitudinal direction of the original fabric. For this reason, the laser running groove 16 provided in the rotary cylinder 12 also corresponds to the fluctuation of the irradiation of the laser beam L2. or to increase the width dimension of the laser running groove 16.

As described above, in the conventional cutting method as shown in FIG. 18, the control of the irradiation of the second laser beam L2 is complicated, and the setting of the formation position and size of the laser running concave groove 16 is also complicated. .

Therefore, in the present invention, in view of the above problems, laser cutting that can stably cut a belt-shaped body into rectangular or square cut pieces by laser processing while simplifying the overall configuration and control. An apparatus and laser cutting method are provided.

The laser cutting device of the present invention is a laser cutting device that cuts a belt-shaped body drawn out from a belt-shaped body supply source into rectangular or square cut pieces by laser processing, and comprises a laser processing machine, an outer diameter A polygonal columnar rotating drum whose surfaces are composed of a plurality of flat surfaces, a driving means for rotating this rotating drum around its axis, a rotating drum control means for controlling this driving means, and a laser of a laser processing machine a laser processing machine control means for controlling processing, wherein the rotating drum control means stops rotation when one flat surface of the outer diameter surface of the rotating drum reaches a predetermined position; The rotating drum is rotated and intermittent feed control is performed to stop the rotation when the next flat surface comes to a predetermined position, and the control means for the laser processing machine stops when each flat surface comes to the predetermined position. The belt-shaped body is controlled by the laser processing machine when the belt-shaped body is being processed. It is provided with an adsorption means that is brought into close contact with each flat surface.

According to the laser cutting apparatus of the present invention, the laser processing machine can cut the belt-like body while the rotating drum is stopped, and the control of the laser processing machine can be facilitated. In addition, since the cutting operation by the laser processing machine can be performed while the strip is adhered to the flat surface of the rotating drum, the slackness of the initial distortion formed in the production process of the strip (for example, the initial distortion of the electrode), The strip can be stably cut without being affected by warping and/or waviness.

It is preferable to provide a supply amount adjusting means for adjusting the supply amount of the belt-like material to the rotating drum between the rotating drum and the belt-like material supply source. Thus, by providing the supply amount adjusting means, it is possible to stably supply the belt-like material to the rotating drum that rotates and stops. That is, when supplying the belt-shaped material to the rotating drum, it is possible to prevent the belt-shaped material from being left over or applying unnecessary tension to the belt-shaped material. In addition, since the supply amount of the belt-like material to the rotating drum can be adjusted by the supply amount adjusting means, it is possible to feed the belt-like material at a constant amount without changing the amount of the belt-like material drawn out from the belt-like material supply source. , the control can be facilitated.

A laser-processed rectangular or square cut piece is brought into close contact with the flat surface of the rotating drum by the suction means until the product discharge position, and the suction is released by the suction means at the product discharge position. preferably. With this configuration, the cut pieces can be separated from the rotating drum at the product discharge position and discharged to the outside.

It is preferable to provide a dregs storage in which dregs after the cut piece is cut out are discharged from the rotary drum at the dregs discharging position. With this configuration, the scraps separated from the product can be stored in the scrap storage, which facilitates post-processing.

A defective portion detecting means for detecting a defective portion of the strip is provided, and the portion corresponding to the cut piece including the defective portion detected by the defective portion detecting means becomes an uncut piece portion that is not cut by the laser processing machine. It may be configured as By constructing in this way, cut pieces containing defective parts are not formed, and it is not necessary to sort out good products that do not contain defective parts from defective products that contain defective parts, and the apparatus is excellent in productivity. becomes.

It is preferable that the scraps include the uncut pieces. With this configuration, there is no need to separately collect the uncut pieces, and workability can be improved.

The cut piece can be used as a positive electrode plate or a negative electrode plate of a secondary battery. Further, by making it possible to feed the belt-like material by rotating the rotating drum in a state where the belt-like material supplied to the rotating drum is attracted to the rotating drum, there is no other belt-like material feeding mechanism. can do. By configuring in this way, the simplification of the device configuration can be achieved.

The laser cutting method of the present invention is a laser cutting method for cutting a belt-shaped body drawn out from a belt-shaped body supply source into rectangular or square cut pieces by laser processing. When one flat surface of the outer diameter surface of the drum reaches a predetermined position, the rotation is stopped, and in the stopped state, a laser beam is applied to the portion to be processed that is attracted to the flat surface of the belt-shaped body. Laser processing is performed by a processing machine to cut into the cut pieces.

According to the laser cutting method of the present invention, the operation of cutting the belt-like body by laser processing can be performed while the rotating drum is stopped, and the control of the laser irradiation position can be facilitated. In addition, since the cutting operation by laser processing can be performed while the strip is adsorbed on the flat surface of the rotating drum, the slack and warp of the initial distortion (for example, the initial distortion of the electrode) formed in the manufacturing process of the strip can be eliminated. , and/or without being affected by waviness and the like.

In the present invention, it is difficult to be affected by slackness, warp, and/or undulation, which are the initial peculiarities of the band (formed during manufacture), and high-precision cutting work is possible. In addition, the mechanism and control can be simplified, and the risk of trouble during work can be reduced.

1 is a simplified block diagram showing the configuration of a laser cutting device of the present invention; FIG. 1 is a schematic diagram of a main part of a laser cutting device of the present invention; FIG. FIG. 4 is an enlarged view of a main portion of the rotating drum; 1 is a simplified diagram showing a cut piece cut by a laser beam from a laser processing machine; FIG. FIG. 3 is a simplified diagram showing scraps from which cut pieces have been cut out; FIG. 10A is a simplified diagram showing the range of the uncut piece portion, and FIG. 8B is a simplified diagram having the uncut piece portion. 1 shows a rotary drum with a flat surface width of 70 mm, (a) is a simplified drawing when the diameter of the rotary drum is 235 mm, and (b) is a simplified drawing when the diameter of the rotary drum is 290 mm. . 1 shows a rotary drum with a flat surface width of 72 mm, (a) is a simplified drawing when the diameter of the rotary drum is 235 mm, and (b) is a simplified drawing when the diameter of the rotary drum is 290 mm. . 1 shows a rotary drum with a flat surface width of 75 mm, (a) is a simplified drawing when the diameter of the rotary drum is 250 mm, and (b) is a simplified drawing when the diameter of the rotary drum is 310 mm. . 1 shows a rotary drum with a flat surface width of 77 mm, (a) is a simplified drawing when the diameter of the rotary drum is 250 mm, and (b) is a simplified drawing when the diameter of the rotary drum is 310 mm. . 1 shows a rotary drum with a flat surface width of 80 mm, (a) is a simplified drawing when the diameter of the rotary drum is 260 mm, and (b) is a simplified drawing when the diameter of the rotary drum is 320 mm. . 1 shows a rotary drum with a flat surface width of 90 mm, (a) is a simplified drawing when the diameter of the rotary drum is 300 mm, and (b) is a simplified drawing when the diameter of the rotary drum is 360 mm. . 1 shows a rotary drum with a flat surface width of 100 mm, (a) is a simplified drawing when the diameter of the rotary drum is 320 mm, and (b) is a simplified drawing when the diameter of the rotary drum is 400 mm. . FIG. 4 is a cross-sectional view of an electrode laminate; It is a simplified perspective view showing a method of manufacturing an electrode laminate. It is a simplified front view showing a method of manufacturing an electrode laminate. It is a simplified perspective view showing a method of manufacturing an electrode laminate. It is a simplified cross-sectional view of a conventional laser processing apparatus of this type.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 16. FIG. FIG. 1 shows a simplified block diagram showing the configuration of a laser cutting apparatus according to the present invention. The laser cutting apparatus includes a laser processing machine 31, a rotating drum 33 having a polygonal cylindrical shape whose outer diameter surface is formed of a plurality of flat surfaces 32, driving means 34 for rotating the rotating drum 33 around its axis, and the A rotary drum control means 35 for controlling the driving means 34, a laser processing machine control means 36 for controlling the laser processing of the laser processing machine 31, and the like are provided. This laser cutting device cuts the strip W (see FIG. 2) drawn out from the strip supply source 37 into rectangular or square cut pieces S (see FIGS. 2 and 4) by laser processing. It is. Although not shown, the strip supply source 37 includes a rotating shaft and means for fixing the strip W in a winding state. The shaft rotates, and the strip W wound around the rotating shaft is sent out. As the drive motor, a motor such as a servomotor that is driven and controlled by any one of pulse signals, analog signals, and network communication signals is used.

Here, the strip W is, for example, a current collector sheet that serves as a base material of a current collector, and the current collector constitutes, for example, a positive electrode plate or a negative electrode plate of a secondary battery. By the way, as one type of lithium ion secondary battery, an electrode laminate 24 as shown in FIG. 14 can be constructed. This laser cutting apparatus cuts out a cut piece S, that is, a cut piece 4 or a cut piece 5 as shown in FIG. 17, which constitutes a positive electrode plate or a negative electrode plate.

The electrode laminate 24 shown in FIG. 14 is formed by alternately stacking negative electrode plates 26 and positive electrode plates 27 with zigzag strip-shaped separators 25 interposed therebetween. That is, as shown in FIGS. 15 and 16, the separator (insulator) is zigzag so that the negative electrode accommodating portion 28 and the positive electrode accommodating portion 29 are formed in opposite directions, and each negative electrode accommodating portion 28 is provided with a negative electrode plate. 26 is accommodated, and the positive electrode plate 27 is accommodated in each of the positive electrode accommodating portions 29 .

The rotating drum 33 includes a drum body 40 as shown in FIG. 3 and a plurality of flat plates 41 circumferentially arranged on the outer diameter surface of the drum body 40 as shown in FIG. The outer surface of this flat plate 41 serves as a plurality of flat surfaces 32 formed on the outer diameter surface of the rotating drum 33 . In this case, the flat surface 32 is a dodecahedron having 12 sides, and the width of the flat surface 32 is 75 mm. And the diameter dimension is set to 310 mm (Fig. 9b).

The flat plate 41 is provided with a large number of suction holes (not shown), and an internal pipe 42 forming part of the adsorption means 30 (see FIG. 1) is provided inside the drum body 40 . The internal piping 42 includes a negative pressure piping 42a that serves as a negative pressure and a positive pressure piping 42b that serves as a positive pressure. The internal pipe 42 and an external pipe (not shown) are communicated with each other. A vacuum generator is connected to an external pipe connected to the negative pressure pipe 42a. As the vacuum generator, a vacuum pump may be used, or an ejector system may be used in which high-pressure air is controlled to be opened and closed and released from a nozzle to a diffuser to generate a negative pressure in the diffusion chamber. A positive pressure pump or the like for supplying positive pressure is connected to the external pipe connected to the positive pressure pipe 42b. By the way, the rotating drum 33 is driven to rotate about its axis through the driving means 34, but the inner pipe 42 and the outer pipe do not rotate and are fixed with this rotation. The driving means 34 can use a motor (driving motor) such as a servomotor that is driven and controlled by any one of pulse signals, analog signals, and network communication signals, like the belt-shaped body supply source 37 .

Therefore, as shown in FIG. 2, when the horizontal axis on the drawing is the X-axis and the axis passing through the axis of the rotating drum and perpendicular to the X-axis is the Y-axis, the second quadrant II and the first A negative pressure is supplied to the suction holes of the flat plate 41 corresponding to the quadrant I and the fourth quadrant IV, and the boundary between the first quadrant I and the fourth quadrant IV, and between the fourth quadrant IV and the third quadrant III. A positive pressure is supplied to the suction hole of the flat plate 41 at a portion corresponding to the boundary between the two.

By supplying the positive pressure to the flat plate 41 corresponding to the positive pressure pipe 42b between the first quadrant I and the fourth quadrant IV, the scrap W1 of the strip W, which will be described later, is removed from the rotating drum 33 in its suction state. is released. This position is the waste discharge position. Then, the scrap W1, whose adsorption state is released at this scrap discharge position, is guided obliquely below the rotating drum 33 by the guide plate 45, and is folded in the shape of a winding through the folding mechanism 46 into the scrap scrap reservoir 47. accumulates in

The folding mechanism 46 includes a pair of rollers 48 that sandwich the scrap W1, and the pair of rollers 48 reciprocates in the directions of arrows A and B via a drive mechanism (not shown). Due to the reciprocating motion of the roller pair 48 , the scrap W1 is folded into a spiral shape and accumulated in the scrap storage 47 .

In addition, by supplying positive pressure to the flat plate 41 corresponding to the positive pressure pipe 42b between the third quadrant III and the fourth quadrant IV, a cut piece S of the belt-like body W, which will be described later, is pulled from the rotating drum 33 into its suction state. is released. For this reason, the products are sequentially accumulated in the product reservoir 50 arranged below the rotating drum 33 .

By the way, between the strip supply source 37 and the rotating drum 33 (in the figure, just before the rotating drum 33), a supply amount adjusting means 51 for adjusting the amount of the strip W supplied to the rotating drum 33 is arranged. . The supply amount adjusting means 51 is composed of dancer means having a roller group 55 consisting of a plurality of rollers 52a to 52g. That is, the belt-shaped body W is wound around the roller group 55, and the rollers 52b and 52d move to 52b' and 52d' and return to the positions 52b and 52d in conjunction with the rotation of the rotary drum 33. The supply amount of the strip W to the drum 33 can be adjusted. For this reason, the supply amount adjusting means 51 has a reciprocating mechanism for vertically moving the rollers 52b and 52d. The number and movement distance of the roller group 55 are determined by the diameter, rotation speed and stop time of the rotary drum 33, and the arrangement shown in FIG. 2 is for reference only and is not a limitation.

Next, the laser processing machine 31 has a laser oscillator (not shown) and a head portion in which the laser beam generated by this oscillator is reflected by a mirror and conveyed. The object (in this case, strip W) (material) is irradiated with light. In this case, a galvano laser is used in which a head section for irradiating laser light is fixed and a mirror in the head section scans the optical path of the laser light. In general, laser processing machines include a flatbed laser in which the head part can move in two axial directions within the processing area, and the head part itself moves in these two axial directions to irradiate the material with laser light. A flatbed laser may be used for the laser processing machine 31 of the present invention. Moreover, as the laser to be used, a short pulse laser such as a picosecond laser or a femtosecond laser is preferable.

By the way, in this apparatus, for example, a defective part detecting means 52 as shown in FIG. The defective portion detection means 52 detects the presence or absence of a coating layer (positive electrode active material layer or negative electrode active material layer) on the strip W, detects a strip connection portion (connecting tape), and corrects meandering of the strip. Parts that do not have a coating layer, parts that have a splicing tape, and parts that cannot detect meandering correction are defective parts. These detections use various types of detection sensors that are optimal for each detection.

The rotating drum control means 35 and the laser processing machine control means 36 are controlled by a control means (computer control) not shown. Here, a computer basically comprises an input means with an input function, an output means with an output function, a storage means with a storage function, an arithmetic means with an arithmetic function, and a control function. It is composed of the control means provided. The input function is for reading information from the outside into the computer, and the read data and programs are converted into signals in a format suitable for the computer system. The output function is to display the calculation results, stored data, etc. to the outside. The storage means stores and saves programs, data, processing results, and the like. Arithmetic functions process data by performing calculations and comparisons according to program instructions. The control function interprets the instructions of the program and issues instructions to each means, and this control function controls all the means of the computer. Input means include keyboards, mice, tablets, microphones, joysticks, scanners, capture boards, and the like. Output means include a monitor, a speaker, a printer, and the like. Storage means include memory, hard disk, CD/CD-R, PD/MO, and the like. The calculation means includes a CPU and the like, and the control means includes a CPU, a motherboard, and the like.

Next, a method of cutting a rectangular or square cut piece S from the strip W with the laser cutting apparatus constructed as described above will be described. First, the strip W is delivered from the strip supply source 37 at a constant delivery rate. Then, the strip W is supplied to the rotating drum 33 via the supply amount adjusting means 51 .

The strip W supplied to the rotating drum 33 is attracted to the rotating drum 33 at the second quadrant II corresponding portion. Due to this adsorption, the strip W is conveyed in the rotating direction (clockwise direction) of the rotating drum 33 as the rotating drum 33 rotates. Then, when one flat surface 32 of the rotating drum 33 (the flat surface on which the portion of the belt-like body from which the cut piece S is to be cut out is attracted) reaches the top (when it faces upward), The rotation of the rotating drum 33 is stopped.

While the rotation of the rotary drum 33 is stopped, a laser beam (for cutting) from the laser processing machine 31 is applied to the portion P to be processed of the belt-like body W attracted to the flat surface 32 facing upward. laser light). At this time, the laser beam is scanned, for example, as indicated by the arrows in FIG. Thereby, the cut piece S can be cut out from the strip W. As shown in FIG.

After that, the rotary drum 33 is driven to rotate again, and when the next flat surface reaches the uppermost position, the rotation of the rotary drum 33 is stopped. Then, in this stopped state, a laser beam (laser beam for cutting) is emitted from the laser processing machine. A laser beam is scanned as indicated by the arrow in FIG. Thus, the cut piece S is cut out from the strip W. As shown in FIG.

After that, the rotating drum 33 is rotated and stopped sequentially, and the cut piece S can be cut out from the belt-like body W by scanning the laser beam while the rotating drum 33 is stopped. Further, if the cut piece S is cut out, as shown in FIG. 5, a cut waste W1 having a cut piece missing portion 54 is formed. Therefore, the scrap W1 has a so-called ladder shape and is composed of a pair of side piece portions 56, 56 and a connecting piece portion 57 that connects the side piece portions 56, 56 together.

Then, the sequentially formed cut pieces S are conveyed to a portion corresponding to the positive pressure pipe 42b between the fourth quadrant IV and the third quadrant III while being adsorbed by the rotary drum 33. Here, the positive pressure pipe 42b With the positive pressure supplied from the outlet, the suction of the rotary drum 33 is released, and the product can be accumulated in the product accumulation portion 50. - 特許庁

Further, the scrap W1 is conveyed to the portion corresponding to the positive pressure pipe 42b between the first quadrant I and the fourth quadrant IV while being adsorbed by the rotary drum 33, where the positive pressure from the positive pressure pipe 42b is transferred. At the time of supply, the adsorption of the rotary drum 33 is released, and the scraps can be accumulated in the scraps reservoir 47 via the guide plate 45 and the folding mechanism 46 .

By the way, since the present laser cutting apparatus is provided with the defective portion detection means 52, even if the defective portion of the strip W reaches the laser processing portion (the uppermost flat surface), the laser processing is not performed. That is, if there is a defective portion in the range indicated by the phantom line in FIG. 6A, the cut piece S in this range is not formed. For this reason, as shown in FIG. 6(b), a wide connecting piece portion 57a (a cut piece corresponding portion 58 including a defective portion) that connects the pair of side piece portions 55 and 56 is formed in the scrap W1. be.

Therefore, the scrap W1 includes a cut piece corresponding portion 58 (uncut piece portion 59) including a defective portion, and this scrap can also be stored in the scrap storage 47. As shown in FIG.

7 to 13 show different sizes of the rotating drum 33. FIG. By changing the number of flat surfaces 32, the diameter of the rotary drum 33 can be kept within a certain range. FIG. 7 shows a rotary drum with a flat surface 32 having a width of 70 mm. is a simplified diagram when the diameter dimension of is 290 mm. FIG. 8 shows a rotating drum in which the flat surface 32 has a width of 72 mm, (a) is a simplified diagram when the diameter of the rotating drum is 235 mm, and (b) is when the diameter of the rotating drum is 290 mm. FIG. 9 shows a rotating drum with a flat surface 32 having a width of 75 mm, (a) is a simplified view of the rotating drum having a diameter of 250 mm, and (b) is a rotating drum. It is a simplified diagram in case the diameter dimension is 310 mm. FIG. 10 shows a rotary drum in which the flat surface 32 has a width of 77 mm, (a) is a simplified diagram when the diameter of the rotary drum is 250 mm, and (b) is a case where the diameter of the rotary drum is 310 mm. 1 is a simplified diagram of FIG. FIG. 11 shows a rotating drum in which the width of the flat surface 32 is 80 mm, (a) is a simplified diagram when the diameter of the rotating drum is 260 mm, and (b) is when the diameter of the rotating drum is 320 mm. 1 is a simplified diagram of FIG. FIG. 12 shows a rotating drum in which the width of the flat surface 32 is 90 mm, (a) is a simplified diagram when the diameter of the rotating drum is 300 mm, and (b) is when the diameter of the rotating drum is 360 mm. 1 is a simplified diagram of FIG. FIG. 13 shows a rotating drum in which the width of the flat surface 32 is 100 mm, (a) is a simplified diagram when the diameter of the rotating drum is 320 mm, and (b) is when the diameter of the rotating drum is 400 mm. 1 is a simplified diagram of FIG. When the width of the flat surface 32 is 70 mm to 80 mm, it is a dodecahedron, and when it is 80 mm to 100 mm, it is a dodecahedron. (b), FIG. 8(b), FIG. 9(b), FIG. 10(b), FIG. 11(b), FIG. 12(a), and FIG. 13(a)). If the number of flat surfaces 32 (not shown) is further decreased or increased, it is possible to deal with the problem without greatly changing the diameter of the rotating drum. That is, it is possible to easily replace the rotary drum according to the product type.

According to the laser cutting apparatus of the present invention, the laser processing machine 31 can cut the strip W while the rotating drum 33 is stopped, and the control of the laser processing machine 31 can be facilitated. can. In addition, since the cutting operation by the laser processing machine 31 can be performed while the belt-like body W is attracted to the flat surface 32 of the rotating drum 33, the initial peculiarities formed in the manufacturing process of the belt-like body W (e.g. The strip W can be cut without being affected by slackness, warping, and/or waviness.

For this reason, in the present invention, it is difficult to be affected by slackness, warp, and/or undulation, which are the initial peculiarities of the band W (formed at the time of manufacture), and high-precision cutting work is possible. In addition, the mechanism and control can be simplified, and the risk of trouble during work can be reduced. In addition, since laser cutting is used, it is possible to cut an electrode sheet of 10 μm or less, and since no metal molds or cutting blades are used, maintenance of these is unnecessary, and the running cost of consumables can be reduced. Although the quality of the cut surface is affected by the type of laser, since cutting is performed with a short pulse laser (picosecond laser or femtosecond laser) as in the embodiment, the quality of the cut surface can be improved. , processing (cutting) at a relatively high speed (for example, 2 m/sec) becomes possible.

It is preferable to provide a supply amount adjusting means 51 for adjusting the supply amount of the belt-like material W to the rotating drum 33 between the rotating drum 33 and the belt-like material supply source 37 . Thus, by providing the supply amount adjusting means 51, it is possible to stably supply the belt-shaped material W to the rotating drum 33 that rotates and stops. That is, when the strip W is supplied to the rotating drum 33, the strip W is not left over, and unnecessary tension is not applied to the strip W. Further, since the supply amount of the belt-like material W to the rotary drum 33 can be adjusted by the supply amount adjusting means 51, the amount of the belt-like material W drawn out from the belt-like material supply source 37 is not fluctuated, and is constant. It can be extended, and the control thereof can be facilitated.

It is preferable that the laser-processed rectangular or square cut piece S is adhered to each flat surface 32 by the suction means 30 up to the product discharge position, and the suction is released by the suction means 30 at the product discharge position. With this configuration, the cut piece S can be peeled off from the rotary drum 33 at the product discharge position and discharged to the outside.

It is preferable to provide a scrap storage 47 in which the scrap W1 after cutting the cut piece S is discharged from the rotary drum 33 and accumulated. With this configuration, the waste W1 separated from the product can be stored in the waste storage 47, which facilitates post-processing.

A cut piece corresponding portion 58 including a defective portion detecting means 52 for detecting a defective portion of the strip W and including the defective portion detected by the defective portion detecting means 52 detects an uncut piece that is not cut by the laser processing machine 31. It may be configured to be the portion 59 . By configuring in this way, the cut piece S including the defective portion is not formed, and it is not necessary to sort out good products not including the defective portion from defective products including the defective portion, and the productivity is excellent. become a device.

It is preferable that the uncut piece portion 59 is included in the scrap W1. With this configuration, there is no need to separately collect the uncut pieces 59, and workability can be improved. Further, in this laser cutting apparatus, by rotating the rotating drum 33 in a state where the belt-like material W supplied to the rotating drum 33 is attracted to the rotating drum 33, it is possible to feed the belt-like material W, thereby cutting other belt-like materials. A configuration without a body feeding mechanism can be employed. By configuring in this way, the simplification of the device configuration can be achieved.

According to the laser cutting method of the present invention, the work of cutting the strip W by laser processing can be performed while the rotating drum is stopped, and the laser irradiation position can be easily controlled. In addition, since the cutting operation by laser processing can be performed while the belt-like body W is attracted to the flat surface 32 of the rotating drum 33, the initial distortion formed in the manufacturing process of the belt-shaped body W (for example, the initial distortion of the electrode) can be performed. The strip W can be cut without being affected by slack, warp, and/or waviness.

The present invention is not limited to the above-described embodiments, and various modifications are possible. However, it is possible to form a rectangular or square cut piece S by laser processing. Further, the cut piece S to be cut on the one flat surface 32 of the rotating drum 33 may be one piece or a plurality of pieces. Therefore, when one cut piece S is cut out using one flat surface 32 , the width dimension of the flat surface 32 corresponds to the width dimension of the cut piece S. In the above-described embodiment, a connecting piece portion 57 having a small width dimension is formed between cutout portions of cut pieces adjacent to each other in the longitudinal direction. You may do so. Further, it is preferable to form a laser running groove on the flat surface 32, but the case where such a laser running groove is not formed is also possible.

By the way, the strip W is a current collector sheet having a positive electrode active material layer if the cut piece S is a positive electrode plate, and a collector sheet having a negative electrode active material layer if the cut piece S is a negative electrode plate. body sheet. Further, the rotary drum 33 is a polygonal column whose outer diameter surface is composed of a plurality of flat surfaces 32. In this case, the rotating drum 33 may be hollow or solid. Further, the width dimension of the flat surface 32 is not limited to that shown in the drawing, and various dimensions can be adopted according to the size (width dimension) of the cut piece S to be cut out. Note that the diameter of the rotating drum 33 is changed by the width of the flat surface 32 . In addition, the width dimension and axial dimension of the flat surface 32 need to be at least such that one cut piece S can be cut out.

When laser processing the strip W with the laser processing machine 31, it is not limited to performing laser processing on the processed portion P of the strip W on the flat surface 32 facing upward as in the embodiment, but in the vertical direction. It is also possible to perform processing on a portion P to be processed of the belt-like body W on the flat surface 32 which is inclined at a predetermined angle with respect to . Also, the laser used by the laser processing machine 31 is not limited to a picosecond laser, a femtosecond laser, or the like, and may be a microsecond laser, a nanosecond laser, or the like. That is, various other lasers can be used depending on the material and thickness of the strip W. FIG.

The rotation stop time of the rotary drum 33 during laser processing is the time to cut through the cut piece S in the laser processing machine 31, the scanning time of the laser beam of the laser processing machine 31 and the size of the cut piece S. It can be changed in various ways depending on the situation. Further, the rotating speed of the rotating drum 33 can be set arbitrarily because the cutting operation by the laser processing machine 31 is not performed.

26 Negative electrode plate 27 Positive electrode plate 30 Attracting means 31 Laser processing machine 32 Flat surface 33 Rotating drum 34 Driving means 35 Rotating drum control means 36 Laser processing machine control means 37 Strip supply source 47 Waste storage 51 Supply amount adjustment Means 52 Defective part detection means 59 Uncut piece S Cut piece W Belt-shaped body W1 Removed waste

Claims (9)

A laser cutting device that cuts a strip drawn out from a strip supply source into rectangular or square cut pieces by laser processing,
A laser processing machine, a rotating drum of a polygonal cylinder whose outer diameter surface has a plurality of flat surfaces, driving means for rotating this rotating drum around its axis, and rotating drum control means for controlling this driving means and laser processing machine control means for controlling laser processing of the laser processing machine, wherein the rotating drum control means controls the rotation when one flat surface of the outer diameter surface of the rotating drum reaches a predetermined position. After stopping, the rotating drum is rotated again, and when the next flat surface reaches a predetermined position, the intermittent feed is controlled to stop the rotation, and the control means for the laser processing machine controls each flat surface is stopped at a predetermined position, laser processing is performed on the belt-shaped body by the laser processing machine, and the rotating drum attracts the belt-shaped body supplied to the rotating drum, 1. A laser cutting apparatus, comprising: a suction means that is brought into close contact with each flat surface of an outer diameter surface of a rotating drum. 2. The laser cutting apparatus according to claim 1, further comprising supply amount adjusting means for adjusting the supply amount of the belt-like material to the rotating drum, provided between the rotating drum and the belt-like material supply source. A laser-processed rectangular or square cut piece is brought into close contact with the flat surface of the rotary drum by the suction means until the product discharge position, and the suction is released by the suction means at the product discharge position. 3. The laser cutting device according to claim 1 or 2. 4. The laser according to any one of claims 1 to 3, characterized in that a scrap sump is provided in which scraps after cutting out the cut piece are discharged from the rotary drum at a scrap discharge position and accumulated therein. cutting device. A defective portion detecting means for detecting a defective portion of the strip is provided, and the portion corresponding to the cut piece including the defective portion detected by the defective portion detecting means becomes an uncut piece portion that is not cut by the laser processing machine. The laser cutting device according to any one of claims 1 to 4, characterized in that: 6. The laser cutting apparatus according to claim 5, wherein the scrap includes the uncut piece portion. The laser cutting device according to any one of claims 1 to 6, wherein the cut piece is a positive electrode plate or a negative electrode plate of a secondary battery. By making it possible to feed the belt-like material by rotating the rotating drum in a state where the belt-like material supplied to the rotating drum is attracted to the rotating drum, the configuration is such that there is no other belt-like material feeding mechanism. The laser cutting device according to any one of claims 1 to 7, characterized by: A laser cutting method for cutting a strip drawn out from a strip supply source into rectangular or square cut pieces by laser processing,
When one flat surface of the outer diameter surface of the rotary drum made up of a polygonal column reaches a predetermined position, the rotation is stopped, and in the stopped state, the cover is in close contact with the flat surface of the strip. A laser cutting method, characterized in that laser processing is performed on a processed portion by a laser processing machine and the cut piece is cut.

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