Method for manufacturing electrode foil

Abstract

To provide a method of manufacturing an electrode foil capable of suppressing generation of burrs in a thickness direction at a cut part of the electrode foil cut by irradiation with a laser beam.SOLUTION: In the manufacturing method of the electrode foil, when the electrode foil is cut by irradiating a laser beam toward the electrode foil composed of a laminated material obtained by laminating dissimilar metal materials, tension is applied in a foil surface direction for separating a cutting part of the electrode foil.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method for producing an electrode foil. [Background technology]

[0002] Patent Document 1 discloses a technique for manufacturing electrode foil for a secondary battery by cutting the electrode foil with a laser beam. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5965094 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology disclosed in Patent Document 1, the electrode foil is cut with laser light and then moved up and down to separate it, which creates burrs in the thickness direction of the electrode foil at the cut part of the electrode foil, which can cause product defects when the electrode foil is stacked.

[0005] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a method for manufacturing electrode foil that can suppress the occurrence of burrs in the thickness direction at the cut portion of the electrode foil cut by irradiating it with laser light. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the method for manufacturing electrode foil according to the present invention is characterized in that when laser light is irradiated onto electrode foil made of a laminate of dissimilar metal materials to cut the electrode foil, tension is applied in the foil surface direction to separate the cut portions of the electrode foil.

[0007] This allows the cut portion of the electrode foil, which has been melted by the heat of the laser light, to be pulled in the foil surface direction to separate it, thereby preventing burrs from forming at the cut portion in the thickness direction of the electrode foil.

[0008] In the above, the vicinity of the cut portion of the electrode foil may be held by a clamp, and the tension may be applied in the foil surface direction to separate the cut portion.

[0009] This makes it possible to apply tension in the foil surface direction, which separates the cut portions of the electrode foil, with a simple configuration. [Effects of the Invention]

[0010] The method for manufacturing electrode foil according to the present invention cuts the cut portion of the electrode foil melted by the heat of the laser light by pulling it in the foil surface direction to separate it, thereby achieving the effect of suppressing the formation of burrs in the thickness direction at the cut portion of the electrode foil cut by irradiating the laser light. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a laser cutting device used in a method for producing an electrode foil according to an embodiment. [Figure 2] FIG. 2 is a perspective view of a laser cutting device used in the method for producing an electrode foil according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the method for producing an electrode foil according to the present invention will be described, but the present invention is not limited to this embodiment.

[0013] Fig. 1 is a diagram showing a schematic configuration of a laser cutting device 1 used in the method for producing an electrode foil 4 according to the embodiment. Fig. 2 is a perspective view of the laser cutting device 1 used in the method for producing an electrode foil 4 according to the embodiment.

[0014] The laser cutting device 1 used in the method for producing the electrode foil 4 according to the embodiment includes a laser irradiation device 2, a feed shaft 31, a winding shaft 32, a clamping mechanism 5, and the like.

[0015] In the laser irradiation device 2, a laser head 20 that irradiates laser light L is attached to a head guide rail 22 via a head holding member 21. The head guide rail 22 extends in a width direction B that is perpendicular to a moving direction A of the electrode foil 4 that is stretched between a feed shaft 31 and a take-up shaft 32. The head holding member 21 that holds the laser head 20 is provided so as to be slidable on the head guide rail 22 by a driving force from a driving device having a motor. The moving speed (scanning speed) of the laser head 20 is, for example, 1200 mm / s.

[0016] In the laser irradiation device 2, laser light L generated by laser oscillation in a laser oscillator (not shown) is output to a laser head 20 via an optical fiber cable (not shown). The laser head 20 irradiates the laser light L toward the electrode foil 4 while sliding on a head guide rail 22 via a head holding member 21. The laser oscillator is, for example, a fiber laser. The oscillation method of the laser oscillator is, for example, CW oscillation. The wavelength of the laser light L is, for example, 1064 [nm]. The output of the laser light L is, for example, 490 [W].

[0017] The electrode foil 4 is a laminated material made by bonding dissimilar metal materials together, and is an electrode foil for a secondary battery constructed by bonding aluminum foil 42 onto copper foil 41. The thickness of the electrode foil 4 is, for example, approximately 60 μm. The electrode foil 4 is attached in a roll to the feed shaft 31, and the portion fed from the feed shaft 31 is cut by laser light L irradiated from the laser head 20 along the width direction B perpendicular to the movement direction A of the electrode foil 4, and is then taken up on the take-up shaft 32.

[0018] The feed shaft 31 and the winding shaft 32 are rotated by driving forces from driving devices having corresponding motors. The rotation speeds of the feed shaft 31 and the winding shaft 32 can be adjusted, for example, by a control device provided in the laser cutting device 1 controlling the number of rotations of the motors of the respective driving devices so that the electrode foil 4 can move in the moving direction A at a preset moving speed. In addition, a plurality of conveying rollers (not shown) are provided below the electrode foil 4 between the feed shaft 31 and the winding shaft 32 in the moving direction A to come into contact with the underside of the electrode foil 4 and convey the electrode foil 4 in the moving direction A.

[0019] Clamping mechanism 5 includes a pair of upstream clamps 51 and a pair of downstream clamps 52 that clamp and hold both ends (edges) of electrode foil 4 in width direction B. The pair of upstream clamps 51 are arranged upstream of cutting portion 40 of electrode foil 4 in movement direction A and opposite each other in width direction B of electrode foil 4. The pair of downstream clamps 52 are arranged downstream of the pair of upstream clamps 51 in movement direction A of electrode foil 4 and opposite each other in width direction B of electrode foil 4.

[0020] The pair of upstream clamps 51 each clamp and hold both end portions (edge ​​portions) of the electrode foil 4 in the width direction B, upstream of cutting portion 40 of the electrode foil 4 in the movement direction A and near cutting portion 40. The pair of downstream clamps 52 each clamp and hold both end portions (edge ​​portions) of the electrode foil 4 in the width direction B, downstream of cutting portion 40 of the electrode foil 4 in the movement direction A and near cutting portion 40.

[0021] The pair of upstream clamps 51 are respectively held by a pair of upstream clamp holding members 53. The pair of upstream clamp holding members 53 are provided so as to be movable at any speed on a pair of clamp guide rails 55 by driving force from a driving device having a corresponding motor. The pair of downstream clamps 52 are respectively held by a pair of downstream clamp holding members 54. The pair of downstream clamp holding members 54 are provided so as to be movable at any speed on the pair of clamp guide rails 55 by power from a driving device having a corresponding motor.

[0022] The desired speed can be adjusted, for example, by controlling the rotation speed of the motor of the drive device using a control device provided in the laser cutting device 1. In addition, in Fig. 2, the pair of upstream clamp holding members 53 and the pair of downstream clamp holding members 54 are respectively provided on the same pair of clamp guide rails 55, but this is not limited to this. For example, the pair of clamp guide rails on which the pair of upstream clamp holding members 53 are provided and the pair of clamp guide rails on which the pair of downstream clamp holding members 54 are provided may be provided separately.

[0023] In the laser cutting device 1 according to the embodiment, when laser light L is irradiated onto the electrode foil 4 along the width direction B to cut the electrode foil 4, tension is applied in the foil surface direction that separates the cut portions 40 of the electrode foil 4 that are irradiated with laser light L and cut. Note that the foil surface direction here refers to a direction parallel to a plane extending in the movement direction A and the width direction B of the electrode foil 4.

[0024] Specifically, in laser cutting device 1 according to the embodiment, laser head 20 irradiates electrode foil 4 with laser light L from one end to the other end in width direction B while sliding on head guide rails 22 via head holding member 21. At this time, a pair of upstream clamps 51 holding electrode foil 4 near the upstream side of cutting portion 40 move downstream in movement direction A on a pair of clamp guide rails 55 via a pair of upstream clamp holding members 53 at the same speed as the movement of electrode foil 4. Furthermore, a pair of downstream clamps 52 holding electrode foil 4 near the downstream side of cutting portion 30 move downstream in movement direction A on a pair of clamp guide rails 55 via a pair of downstream clamp holding members 54 at a speed slightly faster than the movement speed of electrode foil 4.

[0025] In this way, by generating a speed difference between the pair of upstream clamps 51 and the pair of downstream clamps 52, cut portion 40 of electrode foil 4 is pulled in the foil surface direction toward the upstream and downstream sides of moving direction A. In other words, a tension F1 acting in the foil surface direction toward the upstream side of moving direction A is applied by the pair of upstream clamps 51 to the upstream side of cut portion 40 of electrode foil 4 with a simple configuration. Furthermore, a tension F2 acting in the foil surface direction toward the downstream side of moving direction A is applied by the pair of downstream clamps 52 to the downstream side of cut portion 40 of electrode foil 4 with a simple configuration.

[0026] In the method for manufacturing electrode foil 4 using laser cutting device 1 according to the embodiment, electrode foil 4 is cut at cutting portion 40 by pulling it with tension forces F1 and F2 in the foil surface direction, upstream and downstream of movement direction A, which separates cutting portion 40 of electrode foil 4 that has been melted by the heat of laser light L. As a result, in the method for manufacturing electrode foil 4 using laser cutting device 1 according to the embodiment, it is possible to prevent burrs from being formed on the edges of cutting portion 40 in the thickness direction of electrode foil 4.

[0027] Furthermore, in the method for manufacturing electrode foil 4 using laser cutting device 1 according to the embodiment, the use of assist gas or ultrasonic waves to remove the molten material from electrode foil 4 (metal foil) caused by laser light L is not necessary. [Explanation of symbols]

[0028] 1 Laser cutting equipment 2. Laser irradiation device 4 Electrode foil 20 laser head 21 Head holding member 22 Head guide rail 31 Feeding axis 32 Winding shaft 40 Cut section 41 Copper foil 42 Aluminum foil 51 Upstream clamp 52 Downstream clamp 53 Upstream clamp holding member 54 Downstream clamp holding member 55 Clamp guide rail

Claims

1. A method for manufacturing an electrode foil, characterized in that when laser light is irradiated onto an electrode foil made of a laminate of dissimilar metal materials to cut the electrode foil, tension is applied in the foil surface direction to separate the cut portions of the electrode foil.

2. The method for manufacturing an electrode foil according to claim 1, wherein the electrode foil is held in the vicinity of the cut portion by a clamp, and the tension is applied in the foil surface direction to separate the cut portion.

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