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EP-4082730-B1 - CUTTING DEVICE, AND DEVICE FOR MANUFACTURING LAMINATED ELECTRODE ASSEMBLY

EP4082730B1EP 4082730 B1EP4082730 B1EP 4082730B1EP-4082730-B1

Inventors

  • MATSUSHIMA, HIROYUKI

Dates

Publication Date
20260506
Application Date
20201119

Claims (3)

  1. A cutting device (100), comprising: a drum section (102) configured to rotate to convey a continuous body (Wa) of works (W); and a cutting section (104), comprising a cutter drive unit (132) and a cutter unit (130) having a holder (142), a motor (144) and a cutting blade (146), wherein the holder (142) is supported by a corresponding bracket (134) and is arranged to slide in a direction substantially perpendicular to a circumferential direction of the drum section (102), the cutting section (104) being configured to cut the continuous body (Wa) into a plurality of individual works (W), wherein the drum section (102) comprises a plurality of holding heads (116) that are arranged in a circumferential direction thereof and configured to move while holding the respective works (W), the drum section (102) further comprises a drum drive unit (106), a rotating shaft (108), a first disk unit (110), a second disk unit (112) and multiple head drive units (114), wherein the cutter unit (130) is arranged in a circumferential direction of the second disk unit (112), the holding heads (116) are supported respectively by the head drive units (114), and the holding heads (116) are arranged in a circumferential direction of the first disk unit (110), each holding head (116) is arranged to rotate around the rotating shaft (108) by means of the rotation of the first disk unit (110), and each head (116) is arranged to move by means of the head drive unit (114), each holding head (116) comprises a holding surface (128) facing a protruding direction of the first disk unit (110), the holding surface (128) is positioned at a distance of a first radius from a center of the rotating shaft (108), and an adsorption hole is provided on the holding surface (128) so as to adsorb and hold the continuous body (Wa) and the work (W) obtained individually by dividing the continuous body (Wa), the cutting section (104) comprises the cutter unit (130) configured to move together with a plurality of the holding heads (116) by means of the rotation of the drum section (102) and that is smaller in number than the holding heads (116), and the cutter drive unit (132) configured to move the cutter unit (130) independently of a plurality of the holding heads (116), the cutter unit (130) is configured to move alongside of the continuous body (Wa) from a predetermined cutting start position (T1) to cut the continuous body (Wa), and the cutter drive unit (132) is configured to return the cutter unit (130) that has cut the continuous body (Wa), to the cutting start position (T1), wherein the cutting device (100) comprises a control device (156) arranged to control the drum drive unit (106), the head drive units (114), the cutter drive unit (132) and the cutter unit (130).
  2. The cutting device (100) according to claim 1, wherein the cutter unit (130) comprises the cutting blade (146) capable of advancing toward and receding from the continuous body (Wa), while moving alongside of the continuous body (Wa) being conveyed, the cutting blade (146) is configured to advance toward the continuous body (Wa) to cut the continuous body (Wa), and, after cutting the continuous body (Wa), the cutting blade (146) is configured to recede from the continuous body (Wa) while moving alongside of the continuous body (Wa), and the cutter drive unit (132) is configured to return the cutter unit (130) of which the cutting blade (146) has receded, to the cutting start position (T1).
  3. A manufacturing device (1) for a laminated electrode assembly, the manufacturing device (1) comprising: a first electrode cutting drum (2) configured to cut a continuous body of a plurality of first electrode plates into a plurality of the first electrode plates and to convey the first electrode plates; a second electrode cutting drum (6) configured to cut a continuous body of a plurality of second electrode plates into a plurality of the second electrode plates and to convey the second electrode plates; a bonding drum (10) configured to laminate and to bond a first separator continuous body (S1) in which a plurality of first separators are continuously arranged, a plurality of the first electrode plates supplied from the first electrode cutting drum (2), a second separator continuous body (S2) in which a plurality of second separators are continuously arranged, and a plurality of the second electrode plates supplied from the second electrode cutting drum (6) in this order, so as to form a continuous laminated body (26) in which unit laminated bodies, which each are constituted by the first separator, the first electrode plate, the second separator, and the second electrode plate, are continuously arranged; a separator cutting drum (12) configured to cut the first separator continuous body (S1) and the second separator continuous body (S2) in the continuous laminated body (26) to obtain a plurality of the unit laminated bodies; and a laminating drum (14) configured to laminate a plurality of the unit laminated bodies on a lamination stage (30) to form a laminated electrode assembly, wherein at least one of the first electrode cutting drum (2), the second electrode cutting drum (6), or the separator cutting drum (12) is constituted by the cutting device (100) according to claim 1 or 2.

Description

TECHNICAL FIELD The present disclosure relates to a cutting device, and a manufacturing device for a laminated electrode assembly. BACKGROUND ART The document JP2012106370 discloses a lamination and cutting apparatus, neither showing the special technical features of the cutting section, nor of the drum section of the cutting device according to claim 1. As in-vehicle batteries, for example, laminate-type batteries have been developed. Such a battery has a structure in which a container contains a laminated electrode assembly, in which multiple positive electrodes and multiple negative electrodes are alternatively laminated with a separator in between, and an electrolyte. With regard to such a battery, Patent Literature 1 discloses a device for manufacturing a laminated electrode assembly in which a positive electrode, a negative electrode, and a separator are laminated, using, as materials, a continuous positive electrode material in which positive electrodes are continuously formed with a break line provided in between, a continuous negative electrode material in which negative electrodes are continuously formed with a break line provided in between, and a continuous separator material in which separators are continuously formed with a break line provided in between. This manufacturing device has a structure in which a continuous battery material, formed by superimposing the materials over each other, is wound around a winding drum a required number of times, and a side circumferential surface of the winding drum is partially projected in a radial direction to cut the continuous battery material at each break line. PRIOR ART REFERENCE PATENT LITERTURE Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2011-86508 SUMMARY OF INVENTION TECHNICAL PROBLEM With the abovementioned conventional manufacturing device, individual laminated electrode assemblies are manufactured by breaking the continuous battery material along the break lines. Accordingly, there has been a risk of burrs occurring at the cut section of each of the individually divided electrodes. Such a burr generated at an end of an electrode may cause a short circuit, which may lead to deterioration in the quality of the laminated electrode assembly and thus the battery. The present disclosure has been made in view of such a situation, and a purpose thereof is to provide a technology for improving the quality of laminated electrode assemblies. SOLUTION TO PROBLEM One aspect of the present disclosure relates to a cutting device according to claim 1. Another aspect of the present disclosure relates to a manufacturing device for a laminated electrode assembly according to claim 3. ADVANTAGEOUS EFFECTS OF INVENTION The present disclosure can improve the quality of laminated electrode assemblies. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram of a manufacturing device for a laminated electrode assembly according to an embodiment;FIG. 2 is a sectional view that schematically illustrates part of a cutting device according to the embodiment;FIG. 3 is a front view that schematically illustrates the cutting device according to the embodiment; andFIG. 4 shows timing charts of a process of cutting a continuous body. DESCRIPTION OF EMBODIMENTS In the following, the present disclosure will be described based on a preferred embodiment with reference to the drawings. The embodiment is intended to be illustrative only and not to limit the present disclosure, so that it should be understood that not all of the features or combinations thereof described in the embodiment are necessarily essential to the present disclosure. Like reference characters denote like or corresponding constituting elements, members, and processes in each drawing, and repetitive description will be omitted as appropriate. Also, the scale or shape of each component shown in each drawing is defined for the sake of convenience to facilitate the explanation and is not to be regarded as limitative unless otherwise specified. Further, when the terms "first", "second", and the like are used in the present specification or claims, such terms do not imply any order or degree of importance and are used to distinguish one configuration from another, unless otherwise specified. Further, in each drawing, part of members less important in describing the embodiment may be omitted. FIG. 1 is a schematic diagram of a manufacturing device for a laminated electrode assembly according to an embodiment. A manufacturing device 1 for a laminated electrode assembly is a continuous drum-type manufacturing device in which multiple drums are combined. Performing each process of cutting, heating, bonding, laminating, and the like of electrode bodies and separators on the drums enables high-speed and continuous manufacturing of laminated electrode assemblies. The laminated electrode assemblies may be used, for example, for lithium-ion secondary batteries. The manufacturing device 1 in