Electrode manufcturing device and electrode manufcturing method

Abstract

The present invention provides an electrode manufacturing device (1) comprising a stretching unit (20) for stretching a first sheet portion (52) having a smaller thickness than a second sheet portion (54) in an electrode sheet (50) comprising the first sheet portion (52) and the second sheet portion (54). The stretching unit (20) comprises: a stretching roller (200) including a first portion (210) and a second portion (220) which are formed side by side in the axial direction and face the first sheet portion (52) and the second sheet portion (54), respectively; and one or more magnetic field generation units (300) that generate a magnetic field of which the intensity or direction changes over time around the stretching roller (200). The first portion (210) may include a ring-shaped first outer portion (214) which corresponds to a radially outer end portion, protrudes radially outward from the second portion (220), is made of a material including a ferromagnetic material, and is in contact with the first sheet portion (52). The second portion (220) may include a second outer portion (224) which corresponds to a radially outer end portion, is made of a material including a nonmagnetic, paramagnetic or diamagnetic material, and is in contact with or faces the second sheet portion (54).

Description

Electrode manufacturing device and electrode manufacturing method

[0001] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0105561, dated August 7, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to an electrode manufacturing device and an electrode manufacturing method, and more particularly, to an electrode manufacturing device and an electrode manufacturing method that can effectively elongate only a portion (e.g., a non-conductive portion) of an electrode sheet at a low cost with a simple configuration and prevent disconnection of the electrode sheet.

[0003] Cylindrical, square, and pouch-shaped battery cells are known as types of battery cells. Cylindrical battery cells include jelly-roll-type electrode assemblies. Jelly-roll-type electrode assemblies have a structure in which positive and negative electrode sheets are wound with a separator interposed between them.

[0004] Electrode sheets are manufactured by applying an active material to a current collector and then rolling them. At this time, the thicknesses of the electrode sheets, where the active material is applied to the collector and the uncoated portions, where the active material is not applied, differ. Therefore, the amount of elongation between the uncoated and the maintained portions during rolling differs. Consequently, a camber phenomenon occurs, in which the electrode sheet bends from the uncoated portion, where the elongation is smaller, toward the retained portion, where the elongation is greater.

[0005] This camber phenomenon causes problems such as poor electrode sheet meandering, poor winding, and an increased risk of battery cell fire. Specifically, addressing poor meandering or winding requires stopping the process and manually adjusting the electrode sheet's position or connecting it to a winder, which increases electrode production costs and reduces productivity.

[0006] To mitigate the camber phenomenon, the uncoated portion is stretched by applying pressure to the stretching roller after the electrode sheet is rolled. However, if the uncoated portion is pressed too hard with the stretching roller to sufficiently stretch it, the electrode sheet may break. Therefore, a method is needed that can sufficiently stretch the uncoated portion even when the uncoated portion is lightly pressed with the stretching roller.

[0007] A related prior art document is Republic of Korea Publication No. 10-2016-0141448.

[0008] The present invention has been devised to solve the above-described problem, and its purpose is to provide an electrode manufacturing device and an electrode manufacturing method that can effectively elongate only a portion (e.g., a non-conductive portion) of an electrode sheet easily and at low cost with a simple configuration.

[0009] The present invention has been devised to solve the above-described problems, and its purpose is to provide an electrode manufacturing device and an electrode manufacturing method in which a part of an elongation roller is uniformly and effectively inductively heated and energy efficiency is improved.

[0010] The present invention has been devised to solve the above-described problems, and its purpose is to provide an electrode manufacturing device and an electrode manufacturing method that prevent short circuiting of an electrode sheet.

[0011] The present invention has been devised to solve the above-described problems, and its purpose is to provide an electrode manufacturing device and an electrode manufacturing method that can easily control the temperature of an elongation roller.

[0012] The technical objectives of the present invention are not limited to the aforementioned purposes. Other unmentioned objectives and advantages of the present invention can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0013] To solve the above-described problem, the present invention provides an electrode manufacturing device (1) including an extension unit (20).

[0014] The above-mentioned extension section (20) can extend the first sheet section (52) of the electrode sheet (50).

[0015] The above electrode sheet (50) may include the first sheet portion (52) and the second sheet portion (54).

[0016] The first sheet portion (52) and the second sheet portion (54) can be positioned side by side in the width direction.

[0017] The first sheet portion (52) and the second sheet portion (54) can each extend in the longitudinal direction.

[0018] The first sheet portion (52) may have a thickness smaller than the second sheet portion (54).

[0019] The above-mentioned extension unit (20) includes an extension roller (200) and one or more magnetic field generating units (300).

[0020] The above extension roller (200) may include a first portion (210) and a second portion (220).

[0021] The first portion (210) and the second portion (220) can be formed parallel to each other in the axial direction.

[0022] The first portion (210) and the second portion (220) may face the first sheet portion (52) and the second sheet portion (54), respectively.

[0023] The above one or more magnetic field generating units (300) can generate a magnetic field whose strength or direction changes over time around the extension roller (200).

[0024] The above first portion (210) may include a first outer portion (214).

[0025] The above first outer portion (214) may correspond to the radially outer end of the first portion (210).

[0026] The above first outer portion (214) may be composed of a material including a ferromagnetic material.

[0027] The above first outer portion (214) can be in contact with the above first sheet portion (52).

[0028] The above first outer portion (214) may be ring-shaped.

[0029] The above second portion (220) may include a second outer portion (224).

[0030] The above second outer portion (224) may correspond to the radially outer end of the second portion (220).

[0031] The above second outer portion (224) may be composed of a material including a non-magnetic, paramagnetic or diamagnetic material.

[0032] The above second outer portion (224) may be in contact with or face the above second sheet portion (54).

[0033] In one embodiment, the first portion (210) may further include a first body portion (212).

[0034] The above first outer portion (214) can surround the above first body portion (212).

[0035] The above first body part (212) may be composed of a material including a non-magnetic, paramagnetic or diamagnetic material.

[0036] In one embodiment, the first portion (210) may further include a first body portion (212) and an insulating material (T), or the stretching roller (200) may further include an insulating material (T).

[0037] The above first outer portion (214) can surround the above first body portion (212).

[0038] The insulating material (T) included in the first portion (210) may be placed between the first body portion (212) and the first outer portion (214).

[0039] The insulating material (T) included in the above extension roller (200) can be placed between the first portion (210) and the second portion (220) or between the first outer portion (214) and the second outer portion (224) in the axial direction.

[0040] In one embodiment, each of the at least one magnetic field generating unit (300) may include an electromagnet (310) and a power supply unit.

[0041] The above electromagnet (310) can be placed adjacent to the extension roller (200).

[0042] The above electromagnet (310) can generate the above magnetic field.

[0043] The above power supply unit can supply power to the electromagnet (310).

[0044] In one embodiment, the power supply unit can supply an alternating current to the electromagnet (310).

[0045] In one embodiment, the power supply unit may include an AC power source and a frequency converter.

[0046] The above frequency converter can convert the frequency of the AC power source.

[0047] In one embodiment, the electromagnet (310) may be positioned adjacent to the first outer portion (214).

[0048] In one embodiment, the electromagnet (310) may be positioned at a position overlapping the first outer portion (214) in the axial direction.

[0049] In one embodiment, the electromagnet (310) may include a coil (312).

[0050] The above coil (312) may be composed of a conductor wound multiple times around a virtual winding axis (A2).

[0051] The coil (312) can be arranged so that the winding shaft (A2) faces the first outer portion (214).

[0052] In one embodiment, the coil (312) may be positioned so as to overlap the first outer portion (214) in the axial direction.

[0053] In one embodiment, the coil (312) may be arranged so that the winding axis (A2) faces the imaginary central axis (A1) of the stretching roller (200).

[0054] In one embodiment, the winding axis (A2) may be positioned in a vertical virtual plane.

[0055] The above virtual plane can pass through the middle of the first outer portion (214) in the axial direction.

[0056] The above virtual plane may be perpendicular to the axial direction.

[0057] In one embodiment, the electrode sheet (50) may include a plurality of the first sheet portions (52) and one or more of the second sheet portions (54).

[0058] The plurality of first sheet portions (52) and one or more second sheet portions (54) can be alternately positioned in the width direction.

[0059] The above-mentioned extension roller (200) may include a plurality of the first portions (210) and one or more of the second portions (220).

[0060] The above plurality of first portions (210) and the above one or more second portions (220) can be formed alternately in the axial direction.

[0061] The plurality of first portions (210) and the one or more second portions (220) may face the plurality of first sheet portions (52) and the one or more second sheet portions (54), respectively.

[0062] The above-mentioned extension unit (20) may include a plurality of the above-mentioned magnetic field generating units (300).

[0063] The above plurality of magnetic field generating units (300) can each correspond to the above plurality of first sections (210).

[0064] The above plurality of magnetic field generating units (300) may be arranged adjacent to the first outer portions (214) of the above plurality of first portions (210), respectively.

[0065] The above plurality of magnetic field generating units (300) can each generate the magnetic field around the first outer portion (214) of the corresponding first portion (210).

[0066] In one embodiment, each of the magnetic field generating units (300) may include an electromagnet (310) and a power supply unit.

[0067] The above electromagnet (310) can generate the above magnetic field.

[0068] The above power supply unit can supply power to the electromagnet (310).

[0069] The above electromagnet (310) may include a coil (312).

[0070] The above coil (312) may be composed of a conductor wound multiple times around a virtual winding axis (A2).

[0071] The coil (312) of the electromagnet (310) of each of the magnetic field generating units (300) may be arranged so that the winding axis (A2) of the coil (312) faces the first outer portion (214) of each of the first portions (210) corresponding to each of the magnetic field generating units (300).

[0072] In addition, to solve the above-described problem, the present invention provides an electrode manufacturing device (1) including an extension unit (20).

[0073] The above-mentioned extension unit (20) can extend a plurality of first sheet units (52) of the electrode sheet (50).

[0074] The above electrode sheet (50) may include a plurality of first sheet portions (52) and one or more second sheet portions (54).

[0075] The above plurality of first sheet portions (52) and one or more second sheet portions (54) can be positioned alternately in the width direction.

[0076] The above plurality of first sheet portions (52) and one or more second sheet portions (54) can each extend in the longitudinal direction.

[0077] The plurality of first sheet portions (52) may have a thickness smaller than the one or more second sheet portions (54).

[0078] The above-mentioned extension unit (20) may include an extension roller (200) and a plurality of magnetic field generating units (300).

[0079] The above extension roller (200) may include a plurality of first sections (210) and one or more second sections (220).

[0080] The above plurality of first portions (210) and the above one or more second portions (220) can be formed alternately in the axial direction.

[0081] The plurality of first portions (210) and the one or more second portions (220) may face the plurality of first sheet portions (52) and the one or more second sheet portions (54), respectively.

[0082] The above plurality of magnetic field generating units (300) can each correspond to the above plurality of first sections (210).

[0083] The above plurality of magnetic field generating units (300) can be arranged adjacent to each of the above plurality of first sections (210).

[0084] The above-described plurality of magnetic field generating units (300) can each generate a magnetic field whose strength or direction changes over time around the corresponding first portion (210).

[0085] Each of the above magnetic field generating units (300) may include an electromagnet (310) and a power supply unit.

[0086] The above electromagnet (310) can generate the above magnetic field.

[0087] The above power supply unit can supply power to the electromagnet (310).

[0088] The above electromagnet (310) may include a coil (312).

[0089] The above coil (312) may be composed of a conductor wound multiple times around a virtual winding axis (A2).

[0090] The coil (312) of the electromagnet (310) of each of the magnetic field generating units (300) can be arranged so that the winding axis (A2) of the coil (312) faces each of the first portions (210) corresponding to each of the magnetic field generating units (300).

[0091] In one embodiment, the winding axis (A2) of the coil (312) of the electromagnet (310) of each of the magnetic field generating units (300) may be located on a virtual plane.

[0092] The above virtual plane can pass through the middle of each of the first portions (210) corresponding to each of the magnetic field generating portions (300) in the axial direction.

[0093] The above virtual plane may be perpendicular to the axial direction.

[0094] In addition, to solve the above-described problem, the present invention provides an electrode manufacturing method (S900) including an elongation process (S920).

[0095] In the above stretching process (S920), the stretching unit (20) can stretch the first sheet unit (52) of the electrode sheet (50).

[0096] The first sheet portion (52) may have a thickness smaller than the second sheet portion (54).

[0097] The above stretching process (S920) may include a roller heating process (S922) and an electrode sheet heating and pressurizing process (S924).

[0098] In the above roller heating process (S922), the one or more magnetic field generating units (300) can generate a magnetic field whose strength or direction changes over time around the stretching roller (200) to heat the first portion (210) of the stretching roller (200).

[0099] In the above electrode sheet heating and pressurizing process (S924), when the electrode sheet (50) is transported while in contact with the outer periphery of the stretching roller (200), the first portion (210) can heat and pressurize the first sheet portion (52).

[0100] According to embodiments of the present invention, an electrode manufacturing device (1) may include an elongation unit (20) for elongating a first sheet portion (52) having a smaller thickness than the second sheet portion (54) of an electrode sheet (50) including a first sheet portion (52) and a second sheet portion (54) positioned side by side in the width direction and extending in the length direction respectively. The elongation unit (20) includes an elongation roller (200) including a first portion (210) and a second portion (220) formed side by side in the axial direction and facing the first sheet portion (52) and the second sheet portion (54), respectively; and one or more magnetic field generating units (300) for generating a magnetic field whose strength or direction changes over time around the elongation roller (200). The first portion (210) may include a ring-shaped first outer portion (214) corresponding to the radially outer end and protruding radially outward from the second portion (220), made of a material including a ferromagnetic material, and in contact with the first sheet portion (52). The second portion (220) may include a ring-shaped second outer portion (224) corresponding to the radially outer end and made of a material including a non-magnetic, paramagnetic, or diamagnetic material, and in contact with or facing the second sheet portion (54).

[0101] Accordingly, since the first outer portion (214) and the second outer portion (224) of the stretching roller (200) include a ferromagnetic material and a non-ferromagnetic material, respectively, the first outer portion (214) can be effectively inductively heated, while the second outer portion (224) can be not inductively heated or can be inductively heated to a low degree. Accordingly, only the first sheet portion (52) (e.g., non-coated portion) of the electrode sheet (50) can be effectively heated and stretched easily at low cost with a simple configuration, and the second sheet portion (54) (e.g., holding portion) can not be heated or stretched, or can be heated or stretched to a lesser degree than the first sheet portion (52).

[0102] In addition, since the magnetic force lines generated by the magnetic field generating unit (300) are attracted to the first outer portion (214) containing a ferromagnetic material rather than the second outer portion (224) containing a non-ferromagnetic material, the amount of magnetic force change over time in the first outer portion (214) increases, so that the first outer portion (214) can be effectively inductively heated, and the energy efficiency of the extension unit (20) can be improved.

[0103] In addition, since the first outer portion (214) is effectively heated, even if the pressure applied to the first sheet portion (52) by the first portion (210) of the stretching roller (200) decreases, the first sheet portion (52) can be sufficiently stretched. Accordingly, the electrode sheet (50) can be prevented from being disconnected due to the pressure of the stretching roller (200).

[0104] According to embodiments of the present invention, the first portion (210) may further include a first body portion (212). The first outer portion (214) may surround the first body portion (212). The first body portion (212) may be composed of a material including a non-magnetic, paramagnetic, or diamagnetic material.

[0105] Accordingly, the rate at which the magnetic force lines generated by the magnetic field generating unit (300) are drawn into the inside of the first body unit (212) after passing through the first outer portion (214) can be reduced. This is because the first body unit (212) includes a non-ferromagnetic material. Accordingly, the rate at which the magnetic force lines are distributed in the first outer portion (214) increases, so that the amount of change in magnetic force over time in the first outer portion (214) increases, so that the first outer portion (214) can be effectively inductively heated, and the energy efficiency of the extension unit (20) can be improved.

[0106] According to embodiments of the present invention, the first portion (210) may further include a first body portion (212) and an insulating material (T), or the stretching roller (200) may further include an insulating material (T). The first outer portion (214) may surround the first body portion (212). The insulating material (T) included in the first portion (210) may be arranged between the first body portion (212) and the first outer portion (214). The insulating material (T) included in the stretching roller (200) may be arranged between the first portion (210) and the second portion (220) in the axial direction, or between the first outer portion (214) and the second outer portion (224).

[0107] Accordingly, the first outer portion (214) can be effectively heated and the energy efficiency of the extension portion (20) can be improved.

[0108] According to embodiments of the present invention, each of at least one magnetic field generating unit (300) may include an electromagnet (310) disposed adjacent to the stretching roller (200) and generating the magnetic field, and a power supply unit supplying power to the electromagnet (310).

[0109] Accordingly, the strength or direction of the magnetic field around the extension roller (200) can be controlled, so that the temperature of the first outer part (214) can be easily controlled.

[0110] According to embodiments of the present invention, the power supply unit can supply AC current to the electromagnet (310).

[0111] Accordingly, the strength or direction of the magnetic field around the extension roller (200) may change over time.

[0112] According to embodiments of the present invention, the power supply unit may include an AC power source and a frequency converter that converts the frequency of the AC power source.

[0113] Accordingly, the change period or change rate of the magnetic field can be controlled, so the temperature of the first outer part (214) can be easily controlled.

[0114] According to embodiments of the present invention, the electromagnet (310) may be placed adjacent to the first outer portion (214).

[0115] Accordingly, the magnetic flux reaching the first outer portion (214) increases, so that the rate of change of magnetic force over time increases, so that the first outer portion (214) can be effectively inductively heated.

[0116] According to embodiments of the present invention, the electromagnet (310) may be positioned at a position overlapping the first outer portion (214) in the axial direction.

[0117] Accordingly, the uniformity of the magnetic force acting on the first outer portion (214) can be improved. Accordingly, the first outer portion (214) can be uniformly inductively heated.

[0118] According to embodiments of the present invention, the electromagnet (310) may include a coil (312) composed of a conductor wound multiple times around a virtual winding axis (A2). The coil (312) may be arranged so that the winding axis (A2) faces the first outer portion (214).

[0119] Accordingly, since the magnetic flux reaching the first outer portion (214) increases, the rate of change in magnetic force over time increases, so that the first outer portion (214) can be effectively inductively heated and the energy efficiency of the extension portion (20) can be improved.

[0120] According to embodiments of the present invention, the coil (312) may be positioned at a position overlapping the first outer portion (214) in the axial direction.

[0121] Accordingly, the uniformity of the magnetic force acting on the first outer portion (214) can be improved, so that the first outer portion (214) can be uniformly inductively heated.

[0122] According to embodiments of the present invention, the coil (312) may be arranged so that the winding shaft (A2) faces the imaginary central axis (A1) of the stretching roller (200).

[0123] Accordingly, since the magnetic flux reaching the first outer portion (214) increases, the rate of change in magnetic force over time increases, so that the first outer portion (214) can be effectively inductively heated and the energy efficiency of the elongated portion (20) can be improved. In addition, since the uniformity of the magnetic force acting on the first outer portion (214) can be improved, the first outer portion (214) can be uniformly inductively heated.

[0124] According to embodiments of the present invention, the winding shaft (A2) may be positioned on an imaginary plane passing through the middle of the first outer portion (214) in the axial direction and perpendicular to the axial direction.

[0125] Accordingly, since the magnetic flux reaching the first outer portion (214) increases, the rate of change in magnetic force over time increases, so that the first outer portion (214) can be effectively inductively heated and the energy efficiency of the elongated portion (20) can be improved. In addition, since the uniformity of the magnetic force acting on the first outer portion (214) can be improved, the first outer portion (214) can be uniformly inductively heated.

[0126] According to embodiments of the present invention, the electrode sheet (50) may include a plurality of first sheet portions (52) and one or more second sheet portions (54) that are alternately positioned in the width direction. The stretching roller (200) may include a plurality of first portions (210) and one or more second portions (220) that are alternately formed in the axial direction and face the plurality of first sheet portions (52) and the one or more second sheet portions (54), respectively. The stretching portion (20) may include a plurality of magnetic field generating portions (300). The above plurality of magnetic field generating units (300) correspond to the plurality of first sections (210), are respectively arranged adjacent to the first outer sections (214) of the plurality of first sections (210), and can generate the magnetic field around the first outer sections (214) of the corresponding first sections (210).

[0127] Accordingly, the magnetic flux reaching each of the plurality of first outer portions (214) increases and becomes uniform, so that the plurality of first outer portions (214) can be inductively heated uniformly and effectively, and the energy efficiency of the elongation portion (20) can be improved. Accordingly, the plurality of first sheet portions (52) can be elongated uniformly and effectively.

[0128] According to embodiments of the present invention, each of the magnetic field generating units (300) may include an electromagnet (310) that generates the magnetic field and a power supply unit that supplies power to the electromagnet (310). The electromagnet (310) may include a coil (312) formed of a conductor wound multiple times around a virtual winding axis (A2). The coil (312) of the electromagnet (310) of each of the magnetic field generating units (300) may be arranged such that the winding axis (A2) of the coil (312) faces the first outer portion (214) of each of the first portions (210) corresponding to each of the magnetic field generating units (300).

[0129] Accordingly, the magnetic flux reaching the plurality of first outer portions (214) increases, so that the plurality of first outer portions (214) can be effectively inductively heated and the energy efficiency of the extension portion (20) can be improved.

[0130] According to embodiments of the present invention, an electrode manufacturing device (1) may include an elongation unit (20) for elongating a plurality of first sheet portions (52) having a smaller thickness than the one or more second sheet portions (54) of an electrode sheet (50) including a plurality of first sheet portions (52) and one or more second sheet portions (54) that are alternately positioned in the width direction and each extending in the length direction. The elongation unit (20) includes an elongation roller (200) including a plurality of first portions (210) and one or more second portions (220) that are alternately formed in the axial direction and face the plurality of first sheet portions (52) and the one or more second sheet portions (54), respectively; And it may include a plurality of magnetic field generating units (300) that correspond to each of the plurality of first parts (210) and are respectively arranged adjacent to each of the plurality of first parts (210) and generate a magnetic field whose intensity or direction changes over time around the corresponding first parts (210). Each of the magnetic field generating units (300) may include an electromagnet (310) that generates the magnetic field and a power supply unit that supplies power to the electromagnet (310). The electromagnet (310) may include a coil (312) that is formed of a conductor wound multiple times around a virtual winding axis (A2). The coil (312) of the electromagnet (310) of each of the magnetic field generating units (300) may be arranged such that the winding axis (A2) of the coil (312) faces each of the first parts (210) corresponding to each of the magnetic field generating units (300).

[0131] Accordingly, the magnetic flux reaching each of the plurality of first portions (210) (e.g., the first outer portions) increases and becomes uniform, so that the plurality of first portions (210) (e.g., the first outer portions) can be inductively heated uniformly and effectively. Accordingly, the plurality of first sheet portions (52) (e.g., the uncoated portions) of the electrode sheet (50) can be effectively elongated easily and at low cost with a simple configuration. In addition, the energy efficiency of the elongated portion (20) can be improved.

[0132] In addition, since each first portion (210) (e.g., the first outer portion) is effectively heated, even if the pressure that each first portion (210) applies to each first sheet portion (52) is reduced, each first sheet portion (52) can be sufficiently stretched. Accordingly, it is possible to prevent the electrode sheet (50) from being disconnected due to the pressure of the stretching roller (200).

[0133] According to embodiments of the present invention, the winding axis (A2) of the coil (312) of the electromagnet (310) of each of the magnetic field generating units (300) may be positioned on an imaginary plane that passes through the middle of each of the first portions (210) corresponding to each of the magnetic field generating units (300) in the axial direction and is perpendicular to the axial direction.

[0134] Accordingly, the magnetic flux reaching the plurality of first outer portions (214) increases and becomes uniform, so that the plurality of first outer portions (214) can be inductively heated uniformly and effectively, and the energy efficiency of the extension portion (20) can be improved.

[0135] According to embodiments of the present invention, the electrode manufacturing method (S900) may include an elongation process (S920) in which the elongation unit (20) elongates the first sheet portion (52) of the electrode sheet (50) having a smaller thickness than the second sheet portion (54). The elongation process (S920) may include a roller heating process (S922) in which the one or more magnetic field generating units (300) generate a magnetic field whose strength or direction changes over time around the elongation roller (200) to heat the first portion (210) of the elongation roller (200); and an electrode sheet heating and pressurizing process (S924) in which the first portion (210) heats and pressurizes the first sheet portion (52) when the electrode sheet (50) is transported while coming into contact with the outer periphery of the elongation roller (200).

[0136] Accordingly, the first sheet portion (52) (e.g., the non-conductive portion) of the electrode sheet (50) can be effectively stretched easily and at low cost with a simple configuration.

[0137] In addition, since the first outer portion (214) is heated, even if the pressure applied by the first portion (210) of the stretching roller (200) to the first sheet portion (52) decreases, the first sheet portion (52) can be sufficiently stretched. Accordingly, the electrode sheet (50) can be prevented from being disconnected due to the pressure of the stretching roller (200).

[0138] In addition to the effects described above, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

[0139] FIG. 1 is a schematic drawing of an electrode manufacturing device and an electrode sheet according to one embodiment of the present invention.

[0140] Figure 2 is a 2-2' cross-sectional view of the electrode sheet of Figure 1.

[0141] Fig. 3 is a front view schematically showing the extension section of the electrode manufacturing device of Fig. 1.

[0142] Figure 4 is a schematic 4-4' cross-sectional view of Figure 3.

[0143] Figure 5 is a cross-sectional view of a first portion of a stretching roller according to another embodiment.

[0144] Fig. 6 is a cross-sectional view of the second portion of the extension roller of Fig. 3.

[0145] Figure 7 is a flowchart of an electrode manufacturing method according to one embodiment of the present invention.

[0146] [Explanation of symbols]

[0147] 1: Electrode manufacturing device

[0148] 10: Rolling section 20: Elongation section

[0149] 50: Electrode sheet

[0150] 52: First sheet section 54: Second sheet section

[0151] 56: Electrode current collector 58: Composite layer

[0152] 100: Rolling roller

[0153] 200: Extension roller 210: First section

[0154] 212: First body part 214: First outer part

[0155] 220: Second part

[0156] 222: Second body part 224: Second outer part

[0157] T: Insulation A1: Central axis

[0158] 300: Magnetic field generation unit

[0159] 312: Coil A2: Winding shaft

[0160] 314: Core

[0161] The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily practice the technical idea of ​​the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0162] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0163] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0164] Hereinafter, the phrase "any configuration is placed on (or below)" a component or "on (or below)" a component may mean that any configuration is placed in contact with the upper surface (or lower surface) of said component, and that other configurations may be interposed between said component and any configuration placed on (or below) said component.

[0165] Additionally, when it is described that a component is "connected," "coupled," or "connected" to another component, it should be understood that the components may be directly connected or connected to one another, but that other components may also be "interposed" between the components, or that each component may be "connected," "coupled," or "connected" through another component.

[0166] As used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "consisting of" or "comprising" should not necessarily be construed to include all of the components or steps described in the specification, and should be construed to mean that some of the components or steps may not be included, or that additional components or steps may be included.

[0167] FIG. 1 is a schematic drawing of an electrode manufacturing device and an electrode sheet according to one embodiment of the present invention. FIG. 2 is a 2-2' cross-sectional view of the electrode sheet of FIG. 1. FIG. 3 is a front view schematically showing a stretching unit of the electrode manufacturing device of FIG. 1. FIG. 4 is a schematic 4-4' cross-sectional view of FIG. 3. FIG. 5 is a cross-sectional view of a first portion of a stretching roller according to another embodiment. FIG. 6 is a cross-sectional view of a second portion of the stretching roller of FIG. 3. FIG. 7 is a flowchart of an electrode manufacturing method according to one embodiment of the present invention.

[0168] [Electrode manufacturing equipment, electrode sheet]

[0169] Referring to FIG. 1, an electrode manufacturing device (1) according to one embodiment may include a stretching unit (20). The electrode manufacturing device (1) may further include a rolling unit (10).

[0170] The rolling unit (10) can roll the electrode sheet (50). The rolling unit (10) can include a pair of rolling rollers (100). The stretching unit (20) will be described later.

[0171] Referring further to FIG. 2, an electrode sheet (50) according to one embodiment may include a first sheet portion (52) and a second sheet portion (54). The first sheet portion (52) and the second sheet portion (54) may be positioned side by side in the width direction. The first sheet portion (52) and the second sheet portion (54) may each extend in the length direction.

[0172] The thickness of the first sheet portion (52) may be smaller than the thickness of the second sheet portion (54). For example, the first sheet portion (52) may be a portion (uncoated portion) of the electrode sheet (50) where the composite layer (58) containing an electrode active material is not applied to the electrode current collector (56). The second sheet portion (54) may be a portion (maintenance portion) of the electrode sheet (50) where the composite layer (58) containing an electrode active material is applied to the electrode current collector (56).

[0173] Meanwhile, the electrode sheet (50) may include a plurality of first sheet portions (52) and one or more second sheet portions (54). The plurality of first sheet portions (52) and one or more second sheet portions (54) may be positioned alternately in the width direction (Fig. 1, Fig. 2).

[0174] [First embodiment of the extension section]

[0175] Referring further to FIGS. 3 and 4, the stretching unit (20) according to the first embodiment may include a stretching roller (200) and one or more magnetic field generating units (300). The stretching unit (20) may be arranged downstream of the rolling unit (10) in the transport direction of the electrode sheet (50) (FIG. 1). The stretching unit (20) may stretch the first sheet unit (52).

[0176] [Extension roller]

[0177] The stretching roller (200) may include a first portion (210) and a second portion (220). The first portion (210) and the second portion (220) may be formed axially side by side. Here, the axial direction may be parallel to the central axis (A1) of the stretching roller (200) and may correspond to the width direction of the electrode sheet (50) described above. The first portion (210) and the second portion (220) may face the first sheet portion (52) and the second sheet portion (54) of the electrode sheet (50), respectively.

[0178] The first portion (210) may be cylindrical. The first portion (210) may include a first outer portion (214). The first portion (210) may further include a first body portion (212) (Fig. 4). The first portion (210) may be elongated by heating and pressurizing the first sheet portion (52).

[0179] The first body part (212) may be cylindrical. The first body part (212) may be formed integrally with the second part (220) or the second body part (222).

[0180] The first body part (212) may be composed of a material including a non-magnetic, paramagnetic or diamagnetic material.

[0181] Accordingly, the rate at which the magnetic force lines generated by the magnetic field generating unit (300) are drawn into the inside of the first body unit (212) after passing through the first outer portion (214) can be reduced. This is because the first body unit (212) includes a non-ferromagnetic material. Accordingly, the rate at which the magnetic force lines are distributed in the first outer portion (214) increases, so that the amount of change in magnetic force over time in the first outer portion (214) increases, so that the first outer portion (214) can be effectively inductively heated, and the energy efficiency of the extension unit (20) can be improved.

[0182] However, it is not limited to this configuration. That is, the first body part (212) may be composed of a material including a ferromagnetic material, similar to the first outer part (214).

[0183] The first outer portion (214) may correspond to the radially outer end of the first portion (210). The first outer portion (214) may surround the first body portion (212). Here, the radial direction may be a direction that approaches or moves away from the central axis (A1) along a straight line that intersects the central axis (A1) in an imaginary plane perpendicular to the central axis (A1) of the stretching roller (200).

[0184] The first outer portion (214) may protrude radially outwardly relative to the second portion (220). That is, the outer periphery of the first outer portion (214) may be positioned radially outwardly relative to the outer periphery of the second outer portion (224) described later. The first outer portion (214) may be in contact with the first sheet portion (52).

[0185] The first outer portion (214) may be ring-shaped. The first outer portion (214) may be composed of a material including a ferromagnetic material. For example, the first outer portion (214) may be composed of iron.

[0186] Referring further to FIG. 5, the first portion (210) may further include an insulating material (T). The insulating material (T) may be disposed between the first body portion (212) and the first outer portion (214). Meanwhile, the insulating material (T) may also be included in the elongation roller (200). Although not shown in the drawing, the insulating material (T) may also be disposed axially between the first portion (210) and the second portion (220) or between the first outer portion (214) and the second outer portion (224).

[0187] Accordingly, the first outer portion (214) can be effectively heated and the energy efficiency of the extension portion (20) can be improved.

[0188] Referring further to FIG. 6, the second portion (220) according to one embodiment may be cylindrical. When the second portion (220) is cylindrical, the radius of the second portion (220) may be smaller than the radius of the first portion (210) (FIG. 3). However, the present invention is not limited to this configuration. That is, the second portion (220) may not be cylindrical.

[0189] The second portion (220) may include a second outer portion (224). The second portion (220) may further include a second body portion (222) (Fig. 6). The second portion (220) may be in contact with or face the second sheet portion (54).

[0190] The second body part (222) may be cylindrical. The second body part (222), like the second outer part (224), may be composed of a material including a non-magnetic, paramagnetic, or diamagnetic material. The second body part (222) may be formed integrally with the first body part (212).

[0191] The second outer portion (224) may correspond to the radially outer end of the second portion (220). The second outer portion (224) may surround the second body portion (222). The second outer portion (224) may be ring-shaped. The second outer portion (224) may be in contact with or face the second sheet portion (54).

[0192] The second outer portion (224) may be composed of a material including a non-magnetic, paramagnetic, or diamagnetic material. For example, the second outer portion (224) may be a coating layer made of aluminum.

[0193] Accordingly, since the first outer portion (214) and the second outer portion (224) of the stretching roller (200) include a ferromagnetic material and a non-ferromagnetic material, respectively, the first outer portion (214) can be effectively inductively heated, while the second outer portion (224) can be not inductively heated or can be inductively heated to a low degree. Accordingly, only the first sheet portion (52) (e.g., non-coated portion) of the electrode sheet (50) can be effectively heated and stretched easily at low cost with a simple configuration, and the second sheet portion (54) (e.g., holding portion) can not be heated or stretched, or can be heated or stretched to a lesser degree than the first sheet portion (52).

[0194] In addition, since the magnetic force lines generated by the magnetic field generating unit (300) are attracted to the first outer portion (214) containing a ferromagnetic material rather than the second outer portion (224) containing a non-ferromagnetic material, the amount of magnetic force change over time in the first outer portion (214) increases, so that the first outer portion (214) can be effectively inductively heated, and the energy efficiency of the extension unit (20) can be improved.

[0195] In addition, since the first outer portion (214) is effectively heated, even if the pressure applied to the first sheet portion (52) by the first portion (210) of the stretching roller (200) decreases, the first sheet portion (52) can be sufficiently stretched. Accordingly, the electrode sheet (50) can be prevented from being disconnected due to the pressure of the stretching roller (200).

[0196] The stretching roller (200) can stretch the first sheet portion (52) by pressing one side of the first sheet portion (52) in the thickness direction toward the other side in the thickness direction (Fig. 1). For example, when the electrode sheet (50) is transported while contacting the outer circumference of the stretching roller (200), the stretching roller (200) can press the first sheet portion (52) to stretch it. Since the electrode sheet (50) is transported while contacting the outer circumference of the stretching roller (200), the transport direction of the electrode sheet (50) can be changed by the stretching roller (200) (Fig. 1).

[0197] Meanwhile, the extension roller (200) may include a plurality of first sections (210) and one or more second sections (220). The plurality of first sections (210) and one or more second sections (220) may be formed alternately in the axial direction (Fig. 3, Fig. 4). The plurality of first sections (210) and one or more second sections (220) may face a plurality of first sheet sections (52) and one or more second sheet sections (54), respectively.

[0198] [Magnetic field generation unit]

[0199] One or more magnetic field generating units (300) may be placed below the elongation roller (200). The one or more magnetic field generating units (300) may generate a magnetic field whose strength or direction changes over time around the elongation roller (200). Accordingly, an induced current (I) may be generated in the elongation roller (200) (Figs. 3 and 4).

[0200] Each of at least one magnetic field generating unit (300) may include an electromagnet (310) and a power supply unit (not shown).

[0201] The electromagnet (310) may be placed below the elongation roller (200). The electromagnet (310) may be placed adjacent to the elongation roller (200). The electromagnet (310) may generate the magnetic field.

[0202] The electromagnet (310) can be placed adjacent to the first outer portion (214).

[0203] Accordingly, the magnetic flux reaching the first outer portion (214) increases, so that the rate of change of magnetic force over time increases, so that the first outer portion (214) can be effectively inductively heated.

[0204] The electromagnet (310) can be positioned to overlap the first outer portion (214) in the axial direction (Fig. 3, Fig. 4).

[0205] Accordingly, the uniformity of the magnetic force acting on the first outer portion (214) can be improved. Accordingly, the first outer portion (214) can be uniformly inductively heated.

[0206] The electromagnet (310) may include a coil (312). The electromagnet (310) may further include a core (314).

[0207] The coil (312) may be composed of a conductor wound multiple times around a virtual winding axis (A2). The coil (312) may be arranged so that the winding axis (A2) faces the first outer portion (214) (Figs. 3 and 4).

[0208] Accordingly, since the magnetic flux reaching the first outer portion (214) increases, the rate of change in magnetic force over time increases, so that the first outer portion (214) can be effectively inductively heated and the energy efficiency of the extension portion (20) can be improved.

[0209] The coil (312) can be positioned so as to overlap the first outer portion (214) in the axial direction (Fig. 3, Fig. 4).

[0210] Accordingly, the uniformity of the magnetic force acting on the first outer portion (214) can be improved, so that the first outer portion (214) can be uniformly inductively heated.

[0211] The coil (312) can be arranged so that the winding axis (A2) faces the imaginary central axis (A1) of the extension roller (200) (Fig. 4).

[0212] Accordingly, since the magnetic flux reaching the first outer portion (214) increases, the rate of change in magnetic force over time increases, so that the first outer portion (214) can be effectively inductively heated and the energy efficiency of the elongated portion (20) can be improved. In addition, since the uniformity of the magnetic force acting on the first outer portion (214) can be improved, the first outer portion (214) can be uniformly inductively heated.

[0213] The winding axis (A2) can be positioned on an imaginary plane that passes through the middle of the first outer portion (214) in the axial direction and is perpendicular to the axial direction (Fig. 3, Fig. 4).

[0214] Accordingly, since the magnetic flux reaching the first outer portion (214) increases, the rate of change in magnetic force over time increases, so that the first outer portion (214) can be effectively inductively heated and the energy efficiency of the elongated portion (20) can be improved. In addition, since the uniformity of the magnetic force acting on the first outer portion (214) can be improved, the first outer portion (214) can be uniformly inductively heated.

[0215] The core (314) may be inserted into the central portion of the coil (312) or may be disposed through the central portion. The core (314) may include a ferromagnetic material having a high permeability. For example, the core (314) may be composed of a material including iron. Accordingly, since the intensity (magnetic flux density) of the magnetic field (B) increases, the amount of change in magnetic force over time increases, so that the first outer portion (214) can be effectively inductively heated, and the energy efficiency of the extension portion (20) can be improved.

[0216] A power supply unit (not shown) can supply power to the electromagnet (310).

[0217] In this way, the magnetic field generating unit (300) may include an electromagnet (310) and a power supply unit (not shown). Accordingly, the strength or direction of the magnetic field around the stretching roller (200) can be controlled, so that the temperature of the first outer portion (214) can be easily controlled.

[0218] The power supply unit can supply AC current to the electromagnet (310).

[0219] Accordingly, the strength or direction of the magnetic field around the extension roller (200) may change over time.

[0220] The power supply unit may include an AC power source and a frequency converter. The frequency converter may convert the frequency of the AC power source.

[0221] Accordingly, the change period or change rate of the magnetic field can be controlled, so the temperature of the first outer part (214) can be easily controlled.

[0222] Meanwhile, as described above, when the electrode sheet (50) includes a plurality of first sheet portions (52) and one or more second sheet portions (54) and the stretching roller (200) includes a plurality of first portions (210) and one or more second portions (220), a plurality of magnetic field generating portions (300) may be provided. The plurality of magnetic field generating portions (300) may correspond to the plurality of first portions (210), respectively. The plurality of magnetic field generating portions (300) may be arranged adjacent to the first outer portions (214) of the plurality of first portions (210), respectively. The plurality of magnetic field generating portions (300) may generate the magnetic field around the first outer portions (214) of the corresponding first portions (210), respectively (FIGS. 3 and 4).

[0223] Accordingly, the magnetic flux reaching each of the plurality of first outer portions (214) increases and becomes uniform, so that the plurality of first outer portions (214) can be inductively heated uniformly and effectively, and the energy efficiency of the elongation portion (20) can be improved. Accordingly, the plurality of first sheet portions (52) can be elongated uniformly and effectively.

[0224] At this time, each magnetic field generating unit (300) may include an electromagnet (310) that generates the magnetic field and a power supply unit that supplies power to the electromagnet (310). The electromagnet (310) may include a coil (312) composed of a conductor wound multiple times around a virtual winding axis (A2). The coil (312) of the electromagnet (310) of each magnetic field generating unit (300) may be arranged such that the winding axis (A2) of the coil (312) faces the first outer portion (214) of each first portion (210) corresponding to each magnetic field generating unit (300) (FIGS. 3, 4).

[0225] Accordingly, the magnetic flux reaching the plurality of first outer portions (214) increases, so that the plurality of first outer portions (214) can be effectively inductively heated and the energy efficiency of the extension portion (20) can be improved.

[0226] In addition, the winding axis (A2) of the coil (312) of the electromagnet (310) of each magnetic field generating unit (300) may be positioned on an imaginary plane that passes through the middle of each first portion (210) corresponding to each magnetic field generating unit (300) in the axial direction and is perpendicular to the axial direction (Figs. 3 and 4). Here, the middle of each first portion (210) may correspond to the middle of the first outer portion (214) of each first portion (210).

[0227] Accordingly, the magnetic flux reaching the plurality of first outer portions (214) increases and becomes uniform, so that the plurality of first outer portions (214) can be inductively heated uniformly and effectively, and the energy efficiency of the extension portion (20) can be improved.

[0228] In addition, the coil (312) of the electromagnet (310) of each magnetic field generating unit (300) can be arranged so that the winding axis (A2) of the coil (312) of the electromagnet (310) of each magnetic field generating unit (300) faces the virtual central axis (A1) of the extension roller (200) (Fig. 3, Fig. 4).

[0229] [Second embodiment of the extension section]

[0230] The stretching unit (20) according to the second embodiment may include a stretching roller (200) and a plurality of magnetic field generating units (300). The differences from the stretching unit (20) according to the first embodiment described above will be examined.

[0231] As described above, the elongation roller (200) may include a plurality of first sections (210) and one or more second sections (220). The plurality of first sections (210) and the one or more second sections (220) may be formed alternately in the axial direction. The plurality of first sections (210) and the one or more second sections (220) may face a plurality of first sheet sections (52) and one or more second sheet sections (54), respectively (Fig. 3).

[0232] Each first portion (210) may include the first outer portion (214) described above. At this time, unlike the first outer portion (214) of the extension portion (20) according to the first embodiment, the first outer portion (214) of each first portion (210) is not limited to being composed of a material including a ferromagnetic material. Each first portion (210) may be formed integrally without being divided into the first body portion (212) and the first outer portion (214) described above.

[0233] Each second portion (220) may include the second outer portion (224) described above. At this time, unlike the second outer portion (224) of the elongated portion (20) according to the first embodiment, the second outer portion (224) of each second portion (220) is not limited to being composed of a material including a non-magnetic, paramagnetic, or diamagnetic material. Each second portion (220) may be formed integrally without being divided into the second body portion (222) and the second outer portion (224) described above.

[0234] As described above, a plurality of magnetic field generating units (300) may correspond to a plurality of first sections (210), respectively. A plurality of magnetic field generating units (300) may be arranged adjacent to a plurality of first sections (210), respectively. A plurality of magnetic field generating units (300) may each generate a magnetic field whose strength or direction changes over time around the corresponding first sections (210). Each magnetic field generating unit (300) may include an electromagnet (310) and a power supply unit.

[0235] As described above, the electromagnet (310) can generate the magnetic field (Fig. 3). The power supply unit can supply power to the electromagnet (310).

[0236] As described above, the electromagnet (310) may include a coil (312). The coil (312) may be composed of a conductor wound multiple times around an imaginary winding axis (A2). The coil (312) of the electromagnet (310) of each magnetic field generating unit (300) may be arranged such that the winding axis (A2) of the coil (312) faces each first portion (210) corresponding to each magnetic field generating unit (300) (FIGS. 3, 4).

[0237] Accordingly, the magnetic flux reaching each of the plurality of first portions (210) (e.g., the first outer portions) increases and becomes uniform, so that the plurality of first portions (210) (e.g., the first outer portions) can be inductively heated uniformly and effectively. Accordingly, the plurality of first sheet portions (52) (e.g., the uncoated portions) of the electrode sheet (50) can be effectively elongated easily and at low cost with a simple configuration. In addition, the energy efficiency of the elongated portion (20) can be improved.

[0238] In addition, since each first portion (210) (e.g., the first outer portion) is effectively heated, even if the pressure that each first portion (210) applies to each first sheet portion (52) is reduced, each first sheet portion (52) can be sufficiently stretched. Accordingly, it is possible to prevent the electrode sheet (50) from being disconnected due to the pressure of the stretching roller (200).

[0239] As described above, the winding axis (A2) of the coil (312) of the electromagnet (310) of each magnetic field generating unit (300) can be positioned on an imaginary plane that passes through the middle of each first portion (210) corresponding to each magnetic field generating unit (300) in the axial direction and is perpendicular to the axial direction (Fig. 3, Fig. 4).

[0240] The coil (312) of the electromagnet (310) of each magnetic field generating unit (300) can be arranged so that the winding axis (A2) of the coil (312) of the electromagnet (310) of each magnetic field generating unit (300) faces the imaginary central axis (A1) of the extension roller (200) (Fig. 4).

[0241] Meanwhile, matters not mentioned in relation to the extension section (20) according to the second embodiment can be inferred from the extension section (20) according to the first embodiment.

[0242] [Electrode manufacturing method]

[0243] Referring to FIG. 7, an electrode manufacturing method (S900) according to one embodiment of the present invention may include a rolling process (S910). The electrode manufacturing method (S900) may include a stretching process (S920).

[0244] In the rolling process (S910), the rolling roller (100) of the rolling section (10) can roll the electrode sheet (50).

[0245] The stretching process (S920) can be performed after the rolling process (S910).

[0246] In the stretching process (S920), the stretching unit (20) can stretch the first sheet portion (52) of the electrode sheet (50) which has a smaller thickness than the second sheet portion (54).

[0247] The extension process (S920) may include a roller heating process (S922) and an electrode sheet heating and pressurizing process (S924).

[0248] In the roller heating process (S922), the magnetic field generating unit (300) can generate a magnetic field whose strength or direction changes over time around the elongation roller (200) to heat the first outer portion (214) of the first portion (210) of the elongation roller (200).

[0249] In the electrode sheet heating and pressurizing process (S924), when the electrode sheet (50) is transported while coming into contact with the outer periphery of the stretching roller (200), the first outer portion (214) can heat and pressurize the first sheet portion (52).

[0250] Accordingly, the first sheet portion (52) (e.g., the non-conductive portion) of the electrode sheet (50) can be effectively stretched easily and at low cost with a simple configuration.

[0251] In addition, since the first outer portion (214) is heated, even if the pressure applied by the first portion (210) of the stretching roller (200) to the first sheet portion (52) decreases, the first sheet portion (52) can be sufficiently stretched. Accordingly, the electrode sheet (50) can be prevented from being disconnected due to the pressure of the stretching roller (200).

[0252] The roller heating process (S922) and the electrode sheet heating and pressurizing process (S924) can be performed simultaneously.

[0253] It should be understood that the above-described embodiments are illustrative in all respects and not restrictive, and the scope of the present invention will be determined by the claims that follow, rather than by the detailed description set forth above. Furthermore, the meaning and scope of the claims that follow, as well as all possible modifications and variations derived from their equivalent concepts, should be construed as encompassing the scope of the present invention.

[0254] Although the present invention has been described with reference to the drawings exemplified above, it is to be understood that the present invention is not limited to the embodiments and drawings disclosed herein, and that various modifications may be made by those skilled in the art within the scope of the technical idea of ​​the present invention. Furthermore, even if the operational effects according to the configuration of the present invention have not been explicitly described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be acknowledged.

Claims

1. In an electrode manufacturing device (1) including an elongation unit (20) for elongating the first sheet portion (52) having a smaller thickness than the second sheet portion (54) of an electrode sheet (50) including a first sheet portion (52) and a second sheet portion (54) positioned side by side in the width direction and extending in the length direction respectively, The above extension part (20) is, An elongating roller (200) including a first portion (210) and a second portion (220) formed axially side by side and facing the first sheet portion (52) and the second sheet portion (54), respectively; and It includes one or more magnetic field generating units (300) that generate a magnetic field whose strength or direction changes over time around the above extension roller (200), The first portion (210) includes a ring-shaped first outer portion (214) that corresponds to the radially outer end and protrudes radially outward from the second portion (220) and is made of a material including a ferromagnetic material and is in contact with the first sheet portion (52). The second portion (220) corresponds to the radially outer end and is composed of a material including a non-magnetic, paramagnetic or diamagnetic material, and includes a second outer portion (224) that is in contact with or faces the second sheet portion (54). Electrode manufacturing device.

2. In claim 1, The above first part (210) further includes a first body part (212), The above first outer portion (214) surrounds the above first body portion (212), An electrode manufacturing device in which the first body part (212) is made of a material including a non-magnetic, paramagnetic or diamagnetic material.

3. In claim 1 or claim 2, The above first part (210) further includes a first body part (212) and an insulating material (T), or The above extension roller (200) further includes an insulating material (T), The above first outer portion (214) surrounds the above first body portion (212), The insulating material (T) included in the first portion (210) is placed between the first body portion (212) and the first outer portion (214), An electrode manufacturing device in which the insulating material (T) included in the above extension roller (200) is arranged between the first portion (210) and the second portion (220) in the axial direction or between the first outer portion (214) and the second outer portion (224).

4. In any one of claims 1 to 3, An electrode manufacturing device, wherein each of at least one of the magnetic field generating units (300) is disposed adjacent to the elongation roller (200) and includes an electromagnet (310) that generates the magnetic field and a power supply unit that supplies power to the electromagnet (310).

5. In claim 4, The above power supply unit is an electrode manufacturing device that supplies alternating current to the electromagnet (310).

6. In claim 5, An electrode manufacturing device, wherein the power supply unit includes an AC power source and a frequency converter that converts the frequency of the AC power source.

7. In any one of claims 4 to 6, An electrode manufacturing device in which the above electromagnet (310) is placed adjacent to the first outer part (214).

8. In any one of claims 4 to 7, An electrode manufacturing device in which the above electromagnet (310) is positioned so as to overlap the first outer portion (214) in the axial direction.

9. In any one of claims 4 to 8, The above electromagnet (310) includes a coil (312) composed of a conductor wound multiple times around a virtual winding axis (A2), An electrode manufacturing device in which the coil (312) is arranged so that the winding shaft (A2) faces the first outer part (214).

10. In claim 9, An electrode manufacturing device in which the above coil (312) is placed at a position overlapping the first outer portion (214) in the axial direction.

11. In claim 10, An electrode manufacturing device in which the coil (312) is arranged so that the winding axis (A2) faces the imaginary central axis (A1) of the stretching roller (200).

12. In claim 10 or claim 11, The above-mentioned winding shaft (A2) is an electrode manufacturing device that passes through the middle of the first outer part (214) in the axial direction and is located on an imaginary plane perpendicular to the axial direction.

13. In any one of claims 1 to 12, The electrode sheet (50) includes a plurality of first sheet portions (52) and one or more second sheet portions (54) alternately positioned in the width direction, The above extension roller (200) includes a plurality of first sections (210) and one or more second sections (220) that are alternately formed in the axial direction and face each of the plurality of first sheet sections (52) and one or more second sheet sections (54), The above extension unit (20) includes a plurality of the above magnetic field generating units (300), An electrode manufacturing device in which the plurality of magnetic field generating units (300) correspond to the plurality of first sections (210), are respectively arranged adjacent to the first outer sections (214) of the plurality of first sections (210), and generate the magnetic field around the first outer sections (214) of the corresponding first sections (210).

14. In claim 13, Each of the magnetic field generating units (300) includes an electromagnet (310) that generates the magnetic field and a power supply unit that supplies power to the electromagnet (310). The above electromagnet (310) includes a coil (312) composed of a conductor wound multiple times around a virtual winding axis (A2), An electrode manufacturing device in which the coil (312) of the electromagnet (310) of each of the magnetic field generating units (300) is arranged so that the winding axis (A2) of the coil (312) faces the first outer portion (214) of each of the first portions (210) corresponding to each of the magnetic field generating units (300).

15. In an electrode manufacturing device (1) including an elongation unit (20) for elongating a plurality of first sheet portions (52) and one or more second sheet portions (54) that are alternately positioned in the width direction and each extends in the length direction, the electrode sheet (50) including a plurality of first sheet portions (52) having a thickness smaller than that of one or more second sheet portions (54), The above extension part (20) is, An elongating roller (200) including a plurality of first portions (210) and one or more second portions (220) that are formed alternately in the axial direction and face each of the plurality of first sheet portions (52) and one or more second sheet portions (54); and It includes a plurality of magnetic field generating units (300) that correspond to each of the plurality of first sections (210) and are arranged adjacent to each of the plurality of first sections (210) and generate a magnetic field whose strength or direction changes over time around the corresponding first sections (210). Each of the magnetic field generating units (300) includes an electromagnet (310) that generates the magnetic field and a power supply unit that supplies power to the electromagnet (310). The above electromagnet (310) includes a coil (312) composed of a conductor wound multiple times around a virtual winding axis (A2), The coil (312) of the electromagnet (310) of each of the magnetic field generating units (300) is arranged so that the winding axis (A2) of the coil (312) faces each of the first portions (210) corresponding to each of the magnetic field generating units (300). Electrode manufacturing device.

16. In claim 14 or claim 15, An electrode manufacturing device, wherein the winding axis (A2) of the coil (312) of the electromagnet (310) of each of the magnetic field generating units (300) is positioned on an imaginary plane that passes through the middle of each of the first portions (210) corresponding to each of the magnetic field generating units (300) in the axial direction and is perpendicular to the axial direction.

17. In a method for manufacturing an electrode (S900) using an electrode manufacturing device according to any one of claims 1 to 16, The above-mentioned stretching section (20) includes a stretching process (S920) for stretching the first sheet section (52) of the electrode sheet (50) having a thickness smaller than that of the second sheet section (54), The above extension process (S920) is A roller heating process (S922) in which the one or more magnetic field generating units (300) generate a magnetic field whose strength or direction changes over time around the stretching roller (200) to heat the first portion (210) of the stretching roller (200); and When the electrode sheet (50) is transported while coming into contact with the outer circumference of the stretching roller (200), the first section (210) includes an electrode sheet heating and pressurizing process (S924) in which the first sheet section (52) is heated and pressurized. Electrode manufacturing device.

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