Electrode manufacturing device and electrode manufacturing method

Abstract

The present invention provides an electrode manufacturing device (1) comprising a stretching part (20) for stretching a first sheet part (52) of an electrode sheet (50) comprising a first sheet part (52) and a second sheet part (54), the first sheet part (52) having a smaller thickness than the second sheet part (54). The stretching part (20) includes a stretching roller (200) including a first part (210) and a second part (220) formed side by side in an axial direction so as to face the first sheet part (52) and the second sheet part (54), respectively, and one or more magnetic field generating parts (230) installed therein so as to generate a magnetic field (B), the intensity or direction of which changes over time. The first part (210) may include a ring-shaped first outer part (214) which corresponds to a radially outer end portion, protrudes radially outward from the second part (220), is made of a material including a ferromagnetic material, and is in contact with the first sheet part (52). The second part (220) may be made of a material including a nonmagnetic, paramagnetic, or diamagnetic material. The first outer part (214) can be heated by an induced current (I) generated by the magnetic field (B).

Description

Electrode manufacturing device and electrode manufacturing method

[0001] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0108648, dated August 13, 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 heated uniformly and effectively 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 purposes mentioned above. Other objectives and advantages of the present invention not mentioned above 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) may include an extension roller (200).

[0020] The above-mentioned extension roller (200) may be configured to include a first section (210), a second section (220), and one or more magnetic field generating sections (230).

[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 (230) may be installed inside the extension roller (200).

[0024] The above one or more magnetic field generating units (230) can generate a magnetic field (B) whose strength or direction changes over time.

[0025] The above first portion (210) may include a first outer portion (214).

[0026] The above first outer portion (214) may correspond to the radially outer end of the first portion (210).

[0027] The above first outer portion (214) may protrude radially outward from the above second portion (220).

[0028] The above first outer portion (214) may be composed of a material including a ferromagnetic material.

[0029] The above first outer portion (214) can be in contact with the above first sheet portion (52).

[0030] The above first outer portion (214) may be ring-shaped.

[0031] The above second portion (220) may be composed of a material including a non-magnetic, paramagnetic or diamagnetic material.

[0032] The above first outer portion (214) can be heated by the induced current (I) generated by the magnetic field (B).

[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 one or more magnetic field generating units (230) may be positioned inside the first outer portion (214).

[0037] In one embodiment, in the radial direction, the one or more magnetic field generating units (230) may be positioned inside the first outer unit (214).

[0038] In the above radial direction, the one or more magnetic field generating parts (230) may be arranged to face and be adjacent to the first outer part (214).

[0039] In one embodiment, the extension roller (200) may include a plurality of magnetic field generating units (230).

[0040] The above-described plurality of magnetic field generating units (230) can be arranged spaced apart from each other along the circumferential direction surrounding the virtual rotation axis (A1) of the extension roller (200).

[0041] In one embodiment, the plurality of magnetic field generating units (230) may be arranged at equal angular intervals around the virtual rotation axis (A1) of the extension roller (200).

[0042] In one embodiment, each of the magnetic field generating units (230) may include a coil (232).

[0043] The above coil (232) may be composed of a conductor wound multiple times around a virtual winding axis (A2).

[0044] The above coil (232) can generate the magnetic field (B).

[0045] The above extension unit (20) may further include a power supply unit.

[0046] The above power supply unit can supply current to the coil (232) of each of the above magnetic field generating units (230).

[0047] In one embodiment, the extension roller (200) may include a plurality of magnetic field generating units (230).

[0048] The coils (232) of the plurality of magnetic field generating units (230) may be spaced apart from each other along the circumferential direction surrounding the imaginary rotation axis (A1) of the stretching roller (200).

[0049] In one embodiment, the coil (232) of each of the magnetic field generating units (230) may be arranged such that the winding axis (A2) of the coil (232) is parallel to the virtual rotation axis (A1) of the elongation roller (200).

[0050] In one embodiment, the coils (232) of each of the magnetic field generating units (230) may be arranged to surround the imaginary rotational axis (A1) of the elongation roller (200).

[0051] In one embodiment, the coil (232) of each of the magnetic field generating units (230) may be arranged so that the winding axis (A2) of the coil (232) coincides with the virtual rotation axis (A1) of the extension roller (200).

[0052] In one embodiment, in the axial direction, the first position of one end of the coil (232) of the winding portion of each of the magnetic field generating units (230) may correspond to the second position of one end of the first outer portion (214) or may be located on the other side than the second position.

[0053] In addition, in the axial direction, the third position of the other end of the winding portion of the coil (232) of each of the magnetic field generating parts (230) may correspond to the fourth position of the other end of the first outer part (214) or may be located on one side of the fourth position.

[0054] 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).

[0055] The above plurality of first sheet portions (52) and the above one or more second sheet portions (54) can be positioned alternately in the width direction.

[0056] The above-mentioned extension roller (200) may include a plurality of the first sections (210) and one or more of the second sections (220), and a plurality of magnetic field generating groups.

[0057] The above plurality of first portions (210) and the above one or more second portions (220) can be formed alternately in the axial direction.

[0058] 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.

[0059] The above plurality of magnetic field generating groups can each correspond to the above plurality of first sections (210).

[0060] The above plurality of magnetic field generating groups can be positioned spaced apart from each other in the axial direction.

[0061] Each of the above magnetic field generation groups may include one or more magnetic field generation units (230).

[0062] The first outer portion (214) of each of the first portions (210) can be heated by an induced current (I) generated by the magnetic field (B) of one or more magnetic field generating portions (230) of each of the magnetic field generating groups corresponding to each of the first portions (210).

[0063] 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).

[0064] The above first outer portion (214) can surround the above first body portion (212).

[0065] 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).

[0066] The insulating material (T) included in the above extension roller (200) can be placed between the first portion (210) and the second portion (220) in the axial direction or between the first outer portion (214) and the second portion (220).

[0067] In one embodiment, the thermal conductivity of the inner portion of the first portion (210) or the second portion (220) surrounded by the first outer portion (214) may be less than the thermal conductivity of the first outer portion (214).

[0068] In addition, to solve the above-described problem, the present invention provides an electrode manufacturing method (S900) including an elongation process (S920).

[0069] In the above 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).

[0070] The above stretching process (S920) may include a roller heating process (S922) and an electrode sheet heating and pressurizing process (S924).

[0071] In the above roller heating process (S922), the magnetic field generating unit (230) of the stretching roller (200) can inductively heat the first outer portion (214) by generating a magnetic field (B) whose strength or direction changes over time.

[0072] 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 outer portion (214) can heat and pressurize the first sheet portion (52).

[0073] According to embodiments of the present invention, an electrode manufacturing device (1) includes an elongation unit (20) for elongating a first sheet portion (52) having a thickness smaller than that of 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 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 an elongation roller (200) including one or more magnetic field generating units (230) installed therein and generating a magnetic field (B) whose intensity or direction changes over time. The first portion (210) may include 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) may be made of a material including a non-magnetic, paramagnetic, or diamagnetic material. The first outer portion (214) may be heated by an induced current (I) generated by the magnetic field (B).

[0074] Accordingly, since the first outer portion (214) and the second portion (220) 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 portion (220) 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).

[0075] In addition, since the magnetic force lines generated by the magnetic field generating section (230) are attracted to the first outer section (214) containing a ferromagnetic material rather than the second section (220) containing a non-ferromagnetic material, the amount of magnetic force change over time in the first outer section (214) increases, so that the first outer section (214) can be effectively inductively heated, and the energy efficiency of the extension section (20) can be improved.

[0076] 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).

[0077] 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.

[0078] Accordingly, the ratio of the magnetic force lines generated by the magnetic field generating unit (230) being attracted to the first body part (212) can be reduced. This is because the first body part (212) includes a non-ferromagnetic material. Accordingly, the ratio of the magnetic force lines being distributed to the first outer part (214) increases, so that the amount of change in magnetic force over time in the first outer part (214) increases, so that the first outer part (214) can be effectively inductively heated, and the energy efficiency of the extension unit (20) can be improved.

[0079] According to embodiments of the present invention, the one or more magnetic field generating units (230) may be arranged inside the first outer unit (214).

[0080] 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. In addition, the first outer portion (214) can be effectively heated by the self-heating of the magnetic field generating portion (230). Accordingly, the energy efficiency of the extension portion (20) can be improved.

[0081] According to embodiments of the present invention, in the radial direction, the one or more magnetic field generating units (230) may be arranged inside the first outer portion (214), but may be arranged to face and be adjacent to the first outer portion (214).

[0082] 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. In addition, the first outer portion (214) can be effectively heated by the self-heating of the magnetic field generating portion (230). Accordingly, the energy efficiency of the extension portion (20) can be improved.

[0083] According to embodiments of the present invention, the stretching roller (200) may include a plurality of magnetic field generating units (230). The plurality of magnetic field generating units (230) may be arranged spaced apart from each other along a circumferential direction surrounding an imaginary rotational axis (A1) of the stretching roller (200).

[0084] Accordingly, the first outer portion (214) can be heated uniformly and effectively, and the energy efficiency of the extension portion (20) can be improved.

[0085] According to embodiments of the present invention, the plurality of magnetic field generating units (230) can be arranged at equal angular intervals around the virtual rotation axis (A1) of the stretching roller (200).

[0086] Accordingly, the first outer portion (214) can be heated uniformly and effectively, and the energy efficiency of the extension portion (20) can be improved.

[0087] According to embodiments of the present invention, each of the magnetic field generating units (230) may include a coil (232) configured with a conductor wound multiple times around a virtual winding axis (A2) and generating the magnetic field (B). The extension unit (20) may further include a power supply unit that supplies current to the coil (232) of each of the magnetic field generating units (230).

[0088] Accordingly, a magnetic field generating unit (230) can be easily implemented at low cost with a simple configuration. In addition, since the amount of change and the change cycle of the magnetic force can be controlled, the temperature of the first outer portion (214) can be easily controlled.

[0089] According to embodiments of the present invention, the stretching roller (200) may include a plurality of magnetic field generating units (230). The coils (232) of the plurality of magnetic field generating units (230) may be arranged to be spaced apart from each other along a circumferential direction surrounding an imaginary rotational axis (A1) of the stretching roller (200).

[0090] Accordingly, the first outer portion (214) can be heated uniformly and effectively, and the energy efficiency of the extension portion (20) can be improved.

[0091] According to embodiments of the present invention, the coil (232) of each of the magnetic field generating units (230) may be arranged such that the winding axis (A2) of the coil (232) is parallel to the virtual rotation axis (A1) of the stretching roller (200).

[0092] Accordingly, the first outer portion (214) can be heated uniformly and effectively.

[0093] According to embodiments of the present invention, the coil (232) of each of the magnetic field generating units (230) may be arranged to surround the virtual rotation axis (A1) of the elongation roller (200).

[0094] Accordingly, the first outer part (214) can be effectively heated by the induced current (I) generated by the coil (232) and the self-heating of the coil (232).

[0095] Additionally, the coil (232) may be installed in a radially narrow space. For example, the coil (232) may be installed in a radially narrow space corresponding to the width of the conductor. Accordingly, even if the radial width (thickness) of the first portion (210) or the first outer portion (214) is small, the coil (232) may be installed inside the first portion (210) or the first outer portion (214).

[0096] According to embodiments of the present invention, the coil (232) of each of the magnetic field generating units (230) may be arranged so that the winding axis (A2) of the coil (232) coincides with the virtual rotation axis (A1) of the stretching roller (200).

[0097] Accordingly, the first outer portion (214) can be heated uniformly and effectively.

[0098] According to embodiments of the present invention, in the axial direction, the first position of one end of the winding portion of the coil (232) of each of the magnetic field generating units (230) may correspond to the second position of one end of the first outer portion (214) or be located on the other side than the second position, and the third position of the other end of the winding portion of the coil (232) of each of the magnetic field generating units (230) may correspond to the fourth position of the other end of the first outer portion (214) or be located on the other side than the fourth position.

[0099] Accordingly, a strong induced current (I) can be generated on one side and the other side of the first outer portion (214) in the axial direction (Fig. 6). Accordingly, the first outer portion (214) can be heated uniformly and effectively. In addition, heating of the second portion (220) can be prevented or reduced.

[0100] 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, and a plurality of magnetic field generating groups that correspond to the plurality of first portions (210) and are positioned spaced apart from each other in the axial direction. Each of the magnetic field generating groups may include one or more magnetic field generating portions (230). The first outer portion (214) of each of the first portions (210) can be heated by an induced current (I) generated by the magnetic field (B) of one or more magnetic field generating portions (230) of each of the magnetic field generating groups corresponding to each of the first portions (210).

[0101] 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.

[0102] 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 portion (220).

[0103] Accordingly, the first outer portion (214) can be effectively heated and the energy efficiency of the extension portion (20) can be improved.

[0104] According to embodiments of the present invention, the thermal conductivity of the inner part of the first part (210) or the second part (220) surrounded by the first outer part (214) may be lower than the thermal conductivity of the first outer part (214).

[0105] Accordingly, the first outer portion (214) can be effectively heated and the energy efficiency of the extension portion (20) can be improved. In addition, heating of the second portion (220) can be prevented or reduced.

[0106] According to embodiments of the present invention, the electrode manufacturing method (S900) includes an elongation process (S920) in which the elongation part (20) elongates the first sheet part (52) of the electrode sheet (50) having a smaller thickness than the second sheet part (54). The elongation process (S920) includes a roller heating process (S922) in which the magnetic field generating part (230) of the elongation roller (200) generates a magnetic field (B) whose strength or direction changes over time to inductively heat the first outer part (214); and an electrode sheet heating and pressurizing process (S924) in which the first outer part (214) heats and pressurizes the first sheet part (52) when the electrode sheet (50) is transported while in contact with the outer periphery of the elongation roller (200).

[0107] 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.

[0108] 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).

[0109] 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.

[0110] FIG. 1 is a schematic drawing of an electrode manufacturing device and an electrode sheet according to one embodiment of the present invention.

[0111] Figure 2 is a 2-2' cross-sectional view of the electrode sheet of Figure 1.

[0112] Fig. 3 is a cross-sectional view schematically showing one embodiment of the elongation roller of the electrode manufacturing device of Fig. 1.

[0113] Figure 4 is a schematic 4-4' cross-sectional view of Figure 3.

[0114] Fig. 5 is a cross-sectional view schematically showing an extension roller according to another embodiment.

[0115] Figure 6 is an enlarged view of the portion indicated by the dotted rectangle in Figure 5.

[0116] Figure 7 is a schematic 7-7' cross-sectional view of Figure 5.

[0117] Fig. 8 is a cross-sectional view schematically showing an extension roller according to another embodiment.

[0118] Figure 9 is a schematic 9-9' cross-sectional view of Figure 8.

[0119] Fig. 10 is a cross-sectional view schematically showing an extension roller according to another embodiment.

[0120] Figure 11 is a flowchart of an electrode manufacturing method according to one embodiment of the present invention.

[0121] [Explanation of symbols]

[0122] 1: Electrode manufacturing device

[0123] 10: Rolling section 20: Elongation section

[0124] 50: Electrode sheet

[0125] 52: First sheet section 54: Second sheet section

[0126] 56: Electrode current collector 58: Composite layer

[0127] 100: Rolling roller

[0128] 200: Extension roller A1: Rotating shaft

[0129] 210: Part 1

[0130] 212: First body part 214: First outer part

[0131] 220: Second part

[0132] 230: Magnetic field generation unit

[0133] 232: Coil A2: Winding shaft

[0134] T: Insulation

[0135] 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.

[0136] 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.

[0137] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] FIG. 1 is a schematic diagram showing an electrode manufacturing device and an electrode sheet according to an 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 schematic cross-sectional view showing an embodiment of a stretching roller 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 schematic cross-sectional view showing a stretching roller according to another embodiment. FIG. 6 is an enlarged view of a portion indicated by a dotted rectangle in FIG. 5. FIG. 7 is a schematic 7-7' cross-sectional view of FIG. 5. FIG. 8 is a schematic cross-sectional view showing a stretching roller according to another embodiment. FIG. 9 is a schematic 9-9' cross-sectional view of FIG. 8. FIG. 10 is a schematic cross-sectional view showing a stretching roller according to another embodiment. FIG. 11 is a flowchart of an electrode manufacturing method according to an embodiment of the present invention.

[0142] [Electrode manufacturing equipment, electrode sheet]

[0143] 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).

[0144] 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.

[0145] 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.

[0146] 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).

[0147] 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).

[0148] [Yeonshinbu]

[0149] Referring further to FIGS. 3 to 10, the stretching unit (20) may include a stretching roller (200). The stretching unit (20) may further include a power supply unit. The stretching unit (20) may be positioned 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).

[0150] The elongating roller (200) may include a first section (210), a second section (220), and one or more magnetic field generating sections (230). The elongating section (20) may include a plurality of magnetic field generating sections (230). The elongating roller (200) may rotate around an imaginary rotational axis (A1).

[0151] 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).

[0152] [First and second parts of the extension roller]

[0153] 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 rotation 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), respectively.

[0154] The first portion (210) may be ring-shaped or 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).

[0155] The first body part (212) may be ring-shaped or cylindrical. The first body part (212) may be formed integrally with the second part (220).

[0156] The first body portion (212) may be composed of a material including a non-magnetic, paramagnetic, or diamagnetic material. For example, the first body portion (212) may be composed of a material including a non-magnetic, paramagnetic, or diamagnetic composite resin.

[0157] Accordingly, the ratio of the magnetic force lines generated by the magnetic field generating unit (230) being attracted to the first body part (212) can be reduced. This is because the first body part (212) includes a non-ferromagnetic material. Accordingly, the ratio of the magnetic force lines being distributed to the first outer part (214) increases, so that the amount of change in magnetic force over time in the first outer part (214) increases, so that the first outer part (214) can be effectively inductively heated, and the energy efficiency of the extension unit (20) can be improved.

[0158] 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). The first body part (212) may also be formed integrally with the first outer part (214).

[0159] The first outer portion (214) may correspond to the radially outer end of the first portion (210). Here, the radial direction may be a direction that approaches or moves away from the rotational axis (A1) along a straight line that intersects the rotational axis (A1) in an imaginary plane perpendicular to the rotational axis (A1) of the stretching roller (200). The first outer portion (214) may surround the first body portion (212). The first outer portion (214) may be ring-shaped.

[0160] 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).

[0161] 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 a material including iron. The first outer portion (214) may be heated by an induced current (I) generated by a magnetic field (B) generated by the magnetic field generating portion (230) (Fig. 6).

[0162] The second portion (220) may be ring-shaped or 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. The second portion (220) may be in contact with or face the second sheet portion (54).

[0163] The second portion (220) may be composed of a material including a non-magnetic, paramagnetic, or diamagnetic substance. For example, the second portion (220) may be composed of a material including a non-magnetic, paramagnetic, or diamagnetic composite resin.

[0164] Meanwhile, the first portion (210) or the stretching roller (200) may further include an insulating material (T). When the first portion (210) includes an insulating material (T), the insulating material (T) may be arranged between the first body portion (212) and the first outer portion (214) (Fig. 10). When the stretching roller (200) includes an insulating material (T), the insulating material (T) may be arranged axially between the first portion (210) and the second portion (220) or between the first outer portion (214) and the second portion (220) (Fig. 10).

[0165] Accordingly, the first outer portion (214) can be effectively heated and the energy efficiency of the extension portion (20) can be improved.

[0166] The thermal conductivity of the inner portion (i.e., the first body portion) or the second portion (220) of the first portion (210) surrounded by the first outer portion (214) may be lower than the thermal conductivity of the first outer portion (214). For example, the first body portion (212) and / or the second portion (220) may be composed of a material including a composite resin having a thermal conductivity lower than the thermal conductivity of the first outer portion (214).

[0167] Accordingly, the first outer portion (214) can be effectively heated and the energy efficiency of the extension portion (20) can be improved. In addition, heating of the second portion (220) can be prevented or reduced.

[0168] [Magnetic field generation part of the extension roller]

[0169] One or more magnetic field generating units (230) may be installed inside the elongation roller (200). The one or more magnetic field generating units (230) may generate a magnetic field (B) whose strength or direction changes over time. Accordingly, an induced current (I) may be generated in the first outer portion (214).

[0170] Accordingly, since the first outer portion (214) and the second portion (220) 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 portion (220) 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).

[0171] In addition, since the magnetic force lines generated by the magnetic field generating section (230) are attracted to the first outer section (214) containing a ferromagnetic material rather than the second section (220) containing a non-ferromagnetic material, the amount of magnetic force change over time in the first outer section (214) increases, so that the first outer section (214) can be effectively inductively heated, and the energy efficiency of the extension section (20) can be improved.

[0172] 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).

[0173] One or more magnetic field generating units (230) may be arranged inside the first outer portion (214) (Figs. 3, 4, 8 to 10).

[0174] 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. In addition, the first outer portion (214) can be effectively heated by the self-heating of the magnetic field generating portion (230). Accordingly, the energy efficiency of the extension portion (20) can be improved.

[0175] In the radial direction, one or more magnetic field generating units (230) may be arranged inside the first outer portion (214) but adjacent to and facing the first outer portion (214) (Figs. 5 to 7).

[0176] 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. In addition, the first outer portion (214) can be effectively heated by the self-heating of the magnetic field generating portion (230). Accordingly, the energy efficiency of the extension portion (20) can be improved.

[0177] One or more magnetic field generating units (230) can be arranged radially on the outer side (centrifugal side) of the first body unit (212) (Figs. 5 to 7).

[0178] A plurality of magnetic field generating units (230) may be arranged spaced apart from each other along a circumferential direction surrounding the rotation axis (A1). The plurality of magnetic field generating units (230) may be arranged at equiangular intervals around the rotation axis (A1) (Fig. 4, Fig. 7).

[0179] Accordingly, the first outer portion (214) can be heated uniformly and effectively, and the energy efficiency of the extension portion (20) can be improved.

[0180] Each magnetic field generating unit (230) may include a coil (232).

[0181] The coil (232) may be composed of a conductor wound multiple times around a virtual winding axis (A2). The coil (232) may generate the magnetic field (B). At this time, a power supply unit described below may supply current to the coil (232).

[0182] Accordingly, a magnetic field generating unit (230) can be easily implemented at low cost with a simple configuration. In addition, since the amount of change and the change cycle of the magnetic force can be controlled, the temperature of the first outer portion (214) can be easily controlled.

[0183] The coils (232) of the plurality of magnetic field generating units (230) may be arranged spaced apart from each other along the circumferential direction. The coils (232) of the plurality of magnetic field generating units (230) may be arranged at equal angular intervals around the rotation axis (A1) (Fig. 4, Fig. 7).

[0184] Accordingly, the first outer portion (214) can be heated uniformly and effectively, and the energy efficiency of the extension portion (20) can be improved.

[0185] At this time, the coil (232) of each magnetic field generating unit (230) can be arranged so that the winding axis (A2) of the coil (232) is parallel to the rotation axis (A1) (Fig. 3, Fig. 5, Fig. 6).

[0186] Accordingly, the first outer portion (214) can be heated uniformly and effectively.

[0187] The coils (232) of each magnetic field generating unit (230) can be arranged to surround the rotation axis (A1). That is, the conductors of the coils (232) can surround the rotation axis (A1) (Fig. 8, Fig. 9).

[0188] Accordingly, the first outer part (214) can be effectively heated by the induced current (I) generated by the coil (232) and the self-heating of the coil (232).

[0189] Additionally, the coil (232) may be installed in a radially narrow space. For example, the coil (232) may be installed in a radially narrow space corresponding to the width of the conductor. Accordingly, even if the radial width (thickness) of the first portion (210) or the first outer portion (214) is small, the coil (232) may be installed inside the first portion (210) or the first outer portion (214).

[0190] At this time, the coil (232) of each magnetic field generating unit (230) can be arranged so that the winding axis (A2) of the coil (232) matches the rotation axis (A1) of the extension roller (200) (Fig. 8, Fig. 9).

[0191] Accordingly, the first outer portion (214) can be heated uniformly and effectively.

[0192] In the axial direction, the first position of one end of the winding portion of the coil (232) of each magnetic field generating unit (230) may correspond to the second position of one end of the first outer portion (214) or be located on the other side than the second position, and the third position of the other end of the winding portion of the coil (232) of each magnetic field generating unit (230) may correspond to the fourth position of the other end of the first outer portion (214) or be located on the other side than the fourth position (FIGS. 3, 5, 6, and 8).

[0193] Accordingly, a strong induced current (I) can be generated on one side and the other side of the first outer portion (214) in the axial direction (Fig. 6). Accordingly, the first outer portion (214) can be heated uniformly and effectively. In addition, heating of the second portion (220) can be prevented or reduced.

[0194] 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), the elongation roller (200) may include a plurality of first portions (210) and one or more second portions (220) and a plurality of magnetic field generating groups.

[0195] A plurality of first sections (210) and one or more second sections (220) may be formed alternately in the axial direction (Fig. 3, Fig. 5, Fig. 8). 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.

[0196] A plurality of magnetic field generating groups may correspond to a plurality of first sections (210), respectively. The plurality of magnetic field generating groups may be spaced apart from each other in the axial direction. Each magnetic field generating group may include one or more of the aforementioned magnetic field generating units (230) (FIGS. 3, 5, and 8).

[0197] The first outer portion (214) of each first portion (210) can be heated by an induced current (I) generated by a magnetic field (B) of one or more magnetic field generating portions (230) of each magnetic field generating group corresponding to each first portion (210).

[0198] 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.

[0199] A power supply unit (not shown) can supply power to one or more magnetic field generating units (230) of the elongation roller (200). For example, the power supply unit can supply alternating current to each magnetic field generating unit (230). The power supply unit can supply current to a coil (232) of each magnetic field generating unit (230). A method of electrically connecting the power supply unit to each coil (232) inside the elongation roller (200) follows a conventional technique.

[0200] [Electrode manufacturing method]

[0201] Referring to FIG. 11, 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).

[0202] In the rolling process (S910), the rolling roller (100) of the rolling section (10) can roll the electrode sheet (50) (Fig. 1).

[0203] The stretching process (S920) can be performed after the rolling process (S910).

[0204] 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).

[0205] The extension process (S920) may include a roller heating process (S922) and an electrode sheet heating and pressurizing process (S924).

[0206] In the roller heating process (S922), the magnetic field generating unit (230) can inductively heat the first outer portion (214) of the first portion (210) of the stretching roller (200) by generating a magnetic field (B) whose strength or direction changes over time.

[0207] 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).

[0208] 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.

[0209] 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).

[0210] The roller heating process (S922) and the electrode sheet heating and pressurizing process (S924) can be performed simultaneously.

[0211] 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.

[0212] 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, It comprises a first portion (210) and a second portion (220) formed in parallel in the axial direction and facing the first sheet portion (52) and the second sheet portion (54), respectively, and an elongating roller (200) including one or more magnetic field generating portions (230) installed inside and generating a magnetic field (B) whose strength or direction changes over time. 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 above second part (220) is composed of a material including a non-magnetic, paramagnetic or diamagnetic material, The above first outer portion (214) is heated by the induced current (I) generated by the magnetic field (B). 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, An electrode manufacturing device, wherein the one or more magnetic field generating units (230) are arranged inside the first outer unit (214).

4. In claim 1 or claim 2, An electrode manufacturing device, wherein in the above radial direction, the one or more magnetic field generating parts (230) are arranged inside the first outer part (214) but are arranged so as to face and be adjacent to the first outer part (214).

5. In any one of claims 1 to 4, The above extension roller (200) includes a plurality of the above magnetic field generating units (230), An electrode manufacturing device in which the above-mentioned plurality of magnetic field generating units (230) are arranged spaced apart from each other along a circumferential direction surrounding the imaginary rotation axis (A1) of the above-mentioned extension roller (200).

6. In claim 5, An electrode manufacturing device in which the above-mentioned plurality of magnetic field generating units (230) are arranged at equal angular intervals around the virtual rotation axis (A1) of the above-mentioned extension roller (200).

7. In any one of claims 1 to 6, Each of the above magnetic field generating units (230) includes a coil (232) that is composed of a wire wound multiple times around a virtual winding axis (A2) and generates the magnetic field (B). An electrode manufacturing device, wherein the above-mentioned extension unit (20) further includes a power supply unit that supplies current to the coil (232) of each of the above-mentioned magnetic field generating units (230).

8. In claim 7, The above extension roller (200) includes a plurality of the above magnetic field generating units (230), An electrode manufacturing device in which the coils (232) of the plurality of magnetic field generating units (230) are spaced apart from each other along the circumferential direction surrounding the imaginary rotation axis (A1) of the elongation roller (200).

9. In claim 8, An electrode manufacturing device in which the coil (232) of each of the magnetic field generating units (230) is arranged such that the winding axis (A2) of the coil (232) is parallel to the virtual rotation axis (A1) of the stretching roller (200).

10. In claim 7, An electrode manufacturing device in which the coil (232) of each of the magnetic field generating units (230) is arranged to surround the virtual rotation axis (A1) of the elongation roller (200).

11. In claim 10, An electrode manufacturing device in which the coil (232) of each of the magnetic field generating units (230) is arranged so that the winding axis (A2) of the coil (232) coincides with the virtual rotation axis (A1) of the stretching roller (200).

12. In any one of claims 9 to 11, An electrode manufacturing device, wherein, in the axial direction, a first position of one end of the winding portion of the coil (232) of each of the magnetic field generating units (230) corresponds to a second position of one end of the first outer portion (214) or is located on the other side than the second position, and a third position of the other end of the winding portion of the coil (232) of each of the magnetic field generating units (230) corresponds to a fourth position of the other end of the first outer portion (214) or is located on the other side than the fourth position.

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-mentioned 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 the plurality of first sheet sections (52) and the one or more second sheet sections (54), respectively, and a plurality of magnetic field generating groups that correspond to the plurality of first sections (210) and are positioned spaced apart from each other in the axial direction, Each of the above magnetic field generating groups includes one or more magnetic field generating units (230), An electrode manufacturing device, wherein the first outer portion (214) of each of the first portions (210) is heated by an induced current (I) generated by the magnetic field (B) of one or more magnetic field generating portions (230) of each of the magnetic field generating groups corresponding to each of the first portions (210).

14. In any one of claims 1 to 13, 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 portion (220).

15. In any one of claims 1 to 14, An electrode manufacturing device, wherein the thermal conductivity of the inner part of the first part (210) or the second part (220) surrounded by the first outer part (214) is lower than the thermal conductivity of the first outer part (214).

16. In a method for manufacturing an electrode (S900) using an electrode manufacturing device according to any one of claims 1 to 15, 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 magnetic field generating unit (230) of the above-mentioned extension roller (200) generates a magnetic field (B) whose strength or direction changes over time to inductively heat the first outer portion (214); and When the electrode sheet (50) is transported while in contact with the outer circumference of the stretching roller (200), the first outer portion (214) includes an electrode sheet heating and pressurizing process (S924) in which the first sheet portion (52) is heated and pressurized. Electrode manufacturing method.

Images