Electrode rolling apparatus and electrode rolling method

Abstract

The present invention provides an electrode rolling apparatus and an electrode rolling method, wherein the heating position of an induction heating unit is controlled by reflecting a change in position of an uncoated portion of an electrode sheet or the rate of movement of the electrode sheet, thereby uniformly heating the entire area of the uncoated portion and minimizing the range in which the uncoated portion does not receive heat.

Description

Electrode rolling device and electrode rolling method

[0001] The present invention relates to an electrode rolling device and an electrode rolling method.

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0114674, filed August 26, 2024, the entire contents of which are incorporated herein by reference.

[0003] As the application fields of secondary batteries expand, demand for higher-capacity secondary batteries is rapidly increasing. Research is underway on technologies that increase the loading of electrode active materials to increase secondary battery capacity. However, increasing the loading of electrode active materials increases the volume of the electrode. To reduce this volume, a process of rolling the electrode at higher pressure is required.

[0004] In general, the rolling process for rolling an electrode involves pressing and rolling an electrode sheet having a holding portion coated with an electrode active material of a positive or negative electrode and a non-coated portion not coated with an electrode active material using a rolling roller.

[0005] During this rolling process, pressure is applied to the holding portion due to the difference in thickness between the holding portion and the uncoated portion, while almost no pressure is applied to the uncoated portion. At this time, the camber phenomenon, in which the electrode sheet bends due to the difference in elongation between the uncoated and holding portions, often occurs. To solve this problem, heat has been applied to the uncoated portion before rolling.

[0006] Meanwhile, when applying heat to a non-conductive part, an induction heating device is used. The induction heating device is a heating device that converts electrical energy into thermal energy through electromagnetic induction, and is usually configured in the form of a box with a built-in coil.

[0007] These induction heating devices can be used to heat the unheated portion by adjusting the electrical output to set the desired temperature value, thereby elongating the unheated portion.

[0008] However, depending on the composition or material of the electrode sheet and electrode active material, the location of the unheated portion may vary, and when the induction heating device heats the unheated portion at the initially set position, there is a problem that a portion of the unheated portion may not receive heat. In addition, when the moving speed of the electrode sheet changes, such as when the equipment is stopped or started, there is a problem that a portion of the unheated portion may not receive heat, and this causes the problem of electrode disconnection.

[0009] The present invention aims to solve the problem of providing an electrode rolling device and an electrode rolling method capable of controlling the heating position of an induction heating section by reflecting a change in the position of a non-heating section or the moving speed of an electrode sheet.

[0010] In addition, the present invention aims to solve the problem of providing an electrode rolling device and an electrode rolling method capable of minimizing the section in which the non-heated portion does not receive heat by controlling the position of the induction heating portion.

[0011] In order to solve the above problem, an electrode rolling device related to one embodiment of the present invention is an electrode rolling device including a rolling unit for rolling an electrode sheet including a non-coated portion with electrode slurry and a holding portion coated with electrode slurry. The electrode rolling device may include a moving unit for moving the electrode sheet to the rolling unit, a detection unit for detecting a position of the non-coated portion of the electrode sheet moving to the rolling unit, and an induction heating unit that is provided to be movable in the moving direction of the electrode sheet and inductively heats the non-coated portion. The induction heating unit may be provided to be movable along the moving direction of the electrode sheet and the width direction of the electrode sheet. In addition, the moving speed of the induction heating unit may be adjusted according to the moving direction of the electrode sheet based on the moving speed of the electrode sheet.

[0012] According to one embodiment of the present invention, an electrode rolling device including a rolling unit for rolling an electrode sheet including a non-coated portion and a holding portion coated with electrode slurry, the device including a moving unit for moving the electrode sheet to the rolling unit, a detection unit for detecting a position of the non-coated portion of the electrode sheet moving to the rolling unit, an induction heating unit that is provided to be movable in the moving direction of the electrode sheet and inductively heats the non-coated portion, and a control unit for controlling the movement of the induction heating unit so that the induction heating unit is positioned at the position of the detected non-coated portion.

[0013] Additionally, in the electrode rolling device, the control unit can control the movement of the induction heating unit based on the movement speed of the electrode sheet.

[0014] In addition, in the electrode rolling device, the control unit may include a first mode for controlling the movement of the induction heating unit to heat the uncoated portion at a fixed position when the moving speed of the electrode sheet is a preset standard moving speed; and a second mode for controlling the movement of the induction heating unit to inductively heat the uncoated portion while moving at a predetermined speed in the same direction as the moving direction of the electrode sheet when the moving speed of the electrode sheet is higher than the preset standard moving speed.

[0015] Additionally, the electrode rolling device may include a temperature measuring unit for measuring the temperature of the non-conductive portion.

[0016] Additionally, in the electrode rolling device, the control unit can control the temperature of the induction heating unit based on the measured temperature of the unheated portion.

[0017] Additionally, in the electrode rolling device, the temperature measuring unit is connected to the detection unit and can move as one unit.

[0018] In addition, in the electrode rolling device, an upper moving rail is provided, which is positioned above the electrode sheet and includes a first vertical moving rail extending in a first direction along the moving direction of the electrode sheet, and a first horizontal moving rail extending in a second direction along the width direction of the electrode sheet; and a lower moving rail is provided, which is positioned below the electrode sheet and includes a second vertical moving rail extending in a first direction along the moving direction of the electrode sheet, and a second horizontal moving rail extending in a second direction along the width direction of the electrode sheet. The detection unit is connected to the upper moving rail and moves, and the induction heating unit is connected to the lower moving rail and moves.

[0019] In addition, in the electrode rolling device, the induction heating unit includes a coil box having an induction coil built in; and a power supply unit for supplying power so that the induction coil is heated, and the control unit can control movement of the coil box so that the induction coil is aligned with a preset alignment line along the length direction of the electrode sheet between one side of the non-coating unit adjacent to the holding unit and the other side opposite to the one side.

[0020]

[0021] According to another embodiment of the present invention, an electrode rolling method is provided using an electrode rolling apparatus including a rolling unit for rolling an electrode sheet including a plain portion not coated with electrode slurry and a holding portion coated with electrode slurry. The electrode rolling method includes a moving step of moving the electrode sheet to the rolling unit, a detecting step of detecting a position of the plain portion of the electrode sheet being moved to the rolling unit, an induction heating step of inductively heating the plain portion, the plain portion being provided to be movable in the moving direction of the electrode sheet, and a control step of controlling the movement of the induction heating unit so that the induction heating unit is positioned at the position of the detected plain portion.

[0022] Additionally, in the above electrode rolling method, the control step can control the movement of the induction heating section based on the movement speed of the electrode sheet.

[0023] In addition, in the electrode rolling method, the control step may include a first mode step for controlling the movement of the induction heating unit to heat the non-coated portion at a fixed position when the moving speed of the electrode sheet is a preset standard moving speed; and a second mode step for controlling the movement of the induction heating unit to inductively heat the non-coated portion while moving at a predetermined speed in the same direction as the moving direction of the electrode sheet when the moving speed of the electrode sheet is equal to or greater than the preset standard moving speed.

[0024] Additionally, the electrode rolling method may include a temperature measuring step of measuring the temperature of the non-conductive portion.

[0025] Additionally, in the above electrode rolling method, the control step can control the temperature of the induction heating section based on the temperature of the non-heating section measured in the temperature measuring step.

[0026] As described above, the electrode rolling device and electrode rolling method according to one embodiment of the present invention have the following effects.

[0027] The heating position of the induction heating section can be adjusted by reflecting the change in the position of the unheated portion of the electrode sheet or the moving speed of the electrode sheet, thereby minimizing the section in which the unheated portion does not receive heat.

[0028] Figure 1 is a drawing showing an electrode sheet moving to a rolling section.

[0029] Figure 2 is a drawing showing an electrode rolling device according to one embodiment of the present invention.

[0030] Figure 3 is a side view of an electrode rolling device according to one embodiment of the present invention.

[0031] Fig. 4 is a drawing showing an induction heating unit according to one embodiment of the present invention.

[0032] Figure 5 is a block diagram showing a configuration related to the control unit of the present invention.

[0033] Figure 6 is a drawing for explaining the movement of the induction heating unit in the first mode.

[0034] Figure 7 is a drawing for explaining the movement of the induction heating unit in the second mode.

[0035] Figure 8 is a schematic diagram showing an upper moving rail and a lower moving rail.

[0036] Hereinafter, an electrode rolling device and an electrode rolling method according to one embodiment of the present invention will be described in detail with reference to the attached drawings.

[0037] In addition, regardless of the drawing symbol, identical or corresponding components are given identical or similar reference numbers and redundant descriptions thereof are omitted, and for the convenience of explanation, the size and shape of each component depicted may be exaggerated or reduced.

[0038] Figure 1 is a drawing showing an electrode sheet moving to a rolling section.

[0039] Referring to FIG. 1, one embodiment of the present invention relates to an electrode rolling device including a rolling unit (10) for rolling an electrode sheet (1) including a non-coated portion (1-1) and a retaining portion (1-2) coated with electrode slurry.

[0040] The above electrode slurry may contain a positive electrode active material or a negative electrode active material. The electrode slurry containing the positive electrode active material is a positive electrode slurry, and the electrode sheet (1) containing the support portion (1-2) coated with the positive electrode slurry may be a positive electrode sheet. In addition, the electrode slurry containing the negative electrode active material is a negative electrode slurry, and the electrode sheet (1) containing the support portion (1-2) coated with the negative electrode slurry may be a negative electrode sheet.

[0041] The above positive electrode active material or negative electrode active material may use various known compositions without limitation, and the electrode slurry may additionally include a conductive agent, a binder, a plasticizer, a solvent, etc., and the types thereof are not particularly limited.

[0042] The above electrode sheet (1) can be manufactured by applying electrode slurry to a specific area on an electrode current collector having a predetermined width and length.

[0043] For example, the electrode sheet (1) may include a first region coated with electrode slurry along the longitudinal direction (L1) in the central portion of the electrode current collector and a second region excluding the first region, and the second region may be a region in which the electrode slurry is not coated along the longitudinal direction of the electrode current collector at both edges along the width direction (L2) of the electrode current collector, and the first region may be a holding region (1-2) and the second region may be a non-coating region (1-1).

[0044] The above rolling unit (10) includes two rolling rollers (11) heated to a high temperature, and a rolling gap (12) is formed between a pair of rolling rollers (11), and the electrode sheet (1) is rolled while passing through the rolling gap (12), and by controlling the pressure by the rolling rollers (11) and the rolling gap (12), an electrode sheet (1) having a desired thickness and capacity density of an active material can be provided.

[0045] Typically, the holding portion (1-2) and the non-coated portion (1-1) of the electrode sheet (1) have a difference in elongation between the holding portion (1-2) and the non-coated portion (1-1) due to a difference in thickness, and in order to minimize this difference in elongation, a heating process is required to heat the non-coated portion (1-1) before rolling.

[0046] An electrode rolling device related to one embodiment of the present invention is provided to control the heating position of the induction heating unit (300) by reflecting the change in position of the non-heating portion (1-1) or the moving speed of the electrode sheet (1) through the configurations described below in the heating process, and thus has the advantage of minimizing the section in which the non-heating portion (1-1) of the electrode sheet (1) does not receive heat.

[0047] FIG. 2 is a drawing showing an electrode rolling device (1000) according to one embodiment of the present invention, FIG. 3 is a side view of an electrode rolling device according to one embodiment of the present invention, FIG. 4 is a drawing showing an induction heating unit according to one embodiment of the present invention, and FIG. 5 is a block diagram showing a configuration related to a control unit of the present invention.

[0048] Specifically, an electrode rolling device (1000) related to one embodiment of the present invention includes a moving unit (100), a detection unit (200), an induction heating unit (300), and a control unit (400). In addition, the electrode rolling device (1000) may include a rolling unit (10), a moving unit (100), a detection unit (200), an induction heating unit (300), and a control unit (400).

[0049] The above moving unit (100) moves the electrode sheet (1) to the rolling unit (10). The moving unit (100) connects the rolling unit (10) and the coating unit (not shown) that coats electrode slurry on the electrode current collector, and the moving unit (100) may include a plurality of transport rollers arranged between the coating unit and the connecting unit. The coating unit may include a coating device for applying electrode slurry.

[0050] The above detection unit (200) detects the position of the uncoated portion (1-1) of the electrode sheet (1) moving to the rolling unit (10). The detection unit (200) may include, for example, a camera capable of detecting the position of the uncoated portion (1-1). The camera may be arranged to detect the width (W) of the uncoated portion (1-1). For example, the control unit (400) may be arranged to extract the holding portion and the uncoated portion from the image information of the electrode sheet (1) input through the camera, and to calculate the width of the uncoated portion.

[0051] Depending on the material of the electrode current collector or the composition of the electrode slurry, the width (W) of the uncoated portion (1-1) may vary under the same coating conditions, and the position of the uncoated portion (1-1) may vary due to deviation (meandering) from the transport path during transport of the electrode sheet (1). In addition, the detection unit (200) serves to detect changes in the position or width (W) of the uncoated portion (1-1), which may contribute to providing an accurate heating position of the induction heating unit (300) described below.

[0052] The above induction heating unit (300) is provided to be movable and can inductively heat the non-heated portion (1-1). The induction heating unit (300) can be provided to be movable in the movement direction (M) of the electrode sheet. The induction heating unit (300) can convert electrical energy into thermal energy through electromagnetic induction and heat the non-heated portion (1-1) with the converted thermal energy.

[0053] In addition, the induction heating unit (300) may include a coil (311) that converts electrical energy into thermal energy. The induction heating unit (300) may determine a heating area (310-1) that can be heated depending on the size or position of the induction coil (311). The heating area (310-1) may be provided on one side of the coil box (310) facing the non-coated portion (1-1) described below. The heating area (310-1) may be positioned in contact with or adjacent to the non-coated portion (1-1) to inductively heat the non-coated portion (1-1).

[0054] The above control unit (400) controls the movement of the induction heating unit (300) so that the induction heating unit (300) is positioned at the location of the detected unheated portion (1-1). Even if the location of the unheated portion (1-1) on the electrode sheet (1) changes due to various factors, the control unit (400) aligns the heating area (310-1) of the induction heating unit (300) to match the preset alignment line described below, thereby minimizing the section where the unheated portion (1-1) does not receive heat.

[0055] The above detection unit (200) may include a first detection unit (200A) that detects a first uncoated portion (1-1a) having a predetermined first width (W1) at one edge of the electrode sheet (1) and a second detection unit (200B) that detects a second uncoated portion (1-1b) having a predetermined second width (W2) at the other edge of the electrode sheet (1). For example, the detection unit may include one or more cameras.

[0056] In addition, the induction heating unit (300) may include a first induction heating unit (300A) that inductively heats a first uncoated portion (1-1a) having a predetermined first width (W1) at one edge of the electrode sheet (1), and a second induction heating unit (300B) that inductively heats a second uncoated portion (1-1b) having a predetermined second width (W2) at the other edge of the electrode sheet (1).

[0057] The first detection unit (200A) and the first induction heating unit (300A) are linked to each other to detect the position of the first non-conductive part (1-1a) and perform induction heating based on the detected position, and the second detection unit (200B) and the second induction heating unit (300B) are linked to each other to detect the position of the second non-conductive part (1-1b) and perform induction heating based on the detected position.

[0058] In one example, the control unit (400) can control the movement of the induction heating unit (300) based on the movement speed of the electrode sheet (1). Even if the movement speed of the electrode sheet (1) changes, the control unit (400) can control the movement of the induction heating unit (300) to minimize the section where the non-heated section (1-1) does not receive heat by reflecting this change, and by minimizing the section where the non-heated section (1-1) does not receive heat, the frequency of occurrence of short circuits or damage due to short circuits can be reduced.

[0059] Fig. 6 is a drawing for explaining the movement of the induction heating unit in the first mode, and Fig. 7 is a drawing for explaining the movement of the induction heating unit in the second mode.

[0060] Specifically, the control unit (400) may include a first mode (410) for controlling the movement of the induction heating unit (300) to heat the uncoated portion (1-1) at a fixed position when the moving speed of the electrode sheet (1) is a preset standard moving speed, and a second mode (420) for controlling the movement of the induction heating unit (300) to inductively heat the uncoated portion (1-1) while moving at a predetermined speed in the same direction as the moving direction (M) of the electrode sheet (1) when the moving speed of the electrode sheet (1) is equal to or greater than the preset standard moving speed. In this way, the uncoated portion (1-1) can be effectively heated by moving the induction heating unit (300) in the moving direction of the electrode sheet (1) according to a change in the moving speed of the electrode sheet (1). In addition, the moving speed of the induction heating unit (300) may also vary according to a change in the moving speed of the electrode sheet (1).

[0061] Referring to FIG. 6, in the first mode (410), the control unit (400) can fix the movement of the induction heating unit (300) so that the heating area (310-1) of the induction heating unit (300) does not deviate from the state in which it is located within the width (W) of the non-heated portion (1-1) detected from the detection unit (200). That is, the position of the induction heating unit (300) can be fixed, and the floating heating unit (300) can perform a heating operation at the fixed position.

[0062] Meanwhile, if the moving speed of the electrode sheet (1) is higher than the preset standard moving speed, and the position of the induction heating part (300) is fixed to heat the non-heated part (1-1) at a fixed position, such as in the first mode (410), a section in which the non-heated part (1-1) does not receive heat may occur.

[0063] An electrode rolling device (1000) related to one embodiment of the present invention can minimize a section in which the non-heated portion (1-1) does not receive heat through a second mode (420) in which the induction heating portion (300) moves at a predetermined speed in the same direction as the moving direction (M) of the electrode sheet (1) when the moving speed of the electrode sheet (1) becomes relatively faster than the standard moving speed.

[0064] Referring to Fig. 7, in the second mode (420), the induction heating unit (300) can first move to the position of the detected unheated portion (1-1) and then move at a predetermined speed along the same direction as the movement direction (M) of the electrode sheet (1). In the second mode (420), the heating area (310-1) of the induction heating unit (300) can move in the same direction as the movement direction (M) of the electrode sheet (1) while being located within the width (W) of the unheated portion (1-1).

[0065] In addition, the present invention may include a third mode in which, in addition to the first and second modes (410, 420), the movement of the induction heating unit (300) is controlled to inductively heat the non-conductive portion (1-1) while moving at a predetermined speed in the direction opposite to the movement direction (M) of the electrode sheet (1) when the movement speed of the electrode sheet (1) is lower than a preset standard movement speed.

[0066] In general, the electrode rolling device may have an "acceleration section" in which the moving speed of the electrode sheet is higher than the preset standard moving speed, a "deceleration section" in which the moving speed of the electrode sheet is lower than the preset standard moving speed, and a "restart section" after stopping due to various factors. In a section different from the preset standard moving speed, if the non-heated portion (1-1) is heated under the set conditions at the preset standard moving speed, a situation may occur in which the non-heated portion (1-1) does not receive heat or receives more heat than necessary, which may ultimately cause a short circuit and a production loss due to the short circuit.

[0067] The electrode rolling device according to the present invention controls the movement of the induction heating section (300) by selecting any one of the first to third modes for sections where the movement speed of the electrode sheet changes as described above, thereby allowing the non-heating section (1-1) to receive appropriate heat, thereby minimizing the occurrence of short circuits and production loss due to short circuits.

[0068] An electrode rolling device (1000) according to one embodiment of the present invention may include a temperature measuring unit (500) for measuring the temperature of a non-coated portion (1-1). The temperature measuring unit (500) may include a temperature sensor for measuring the surface temperature of the non-coated portion (1-1). For example, the temperature sensor may be a non-contact sensor. The temperature measuring unit (500) may be provided to be movable. The temperature measuring unit (500) may include a first temperature measuring unit (500A) for measuring the temperature of a first non-coated portion (1-1a) having a first width (W1) at one edge of an electrode sheet (1), and a second temperature measuring unit (500B) for measuring the temperature of a second non-coated portion (1-1b) having a second width (W2) at the other edge of the electrode sheet (1).

[0069] For example, the first detection unit (200A), the first temperature measurement unit (500A), and the first induction heating unit (300A) are linked to each other to perform position detection, temperature measurement, and induction heating of the first non-coated portion (1-1a), respectively, and the second detection unit (200B), the second temperature measurement unit (500B), and the second induction heating unit (300B) are linked to each other to perform position detection and induction heating of the second non-coated portion (1-1b), respectively.

[0070] The control unit (400) can control the movement of the temperature measuring unit (500) so that the temperature measuring unit (500) is positioned at the position of the detected uncoated portion (1-1). The control unit (400) can control the movement of the temperature measuring unit (500) so that the temperature measuring unit (500) is positioned at the position of the detected uncoated portion (1-1) as described above, so that even if the width (W) of the uncoated portion (1-1) changes depending on the material of the electrode current collector or the composition of the electrode slurry, or even if the position of the uncoated portion (1-1) changes due to deviation from the movement path of the electrode sheet (1) during movement and meandering occurs, the temperature of the uncoated portion (1-1) can be accurately measured.

[0071] The control unit (400) can control the temperature of the induction heating unit (300) based on the measured temperature of the uncoated portion (1-1). If the temperature of the uncoated portion (1-1) is lower or higher than the target temperature, the control unit (400) can control the temperature of the induction heating unit (300) to adjust the temperature of the uncoated portion (1-1) to the target temperature. The target temperature may mean, for example, a temperature at which the difference in elongation between the holding portion (1-2) and the uncoated portion (1-1) is minimized.

[0072] The temperature measuring unit (500) can be connected to the detection unit (200) and move as one unit. For example, the temperature measuring unit (500) and the detection unit (200) can be connected to a movable stage unit (600). Since the temperature measuring unit (500) is connected to the detection unit (200) and moves as one unit, the loss used when controlling the movement of the temperature measuring unit (500) and the detection unit (200) can be reduced.

[0073] The above-mentioned movable stage unit (600) may include, for example, a first movable stage unit (600A) to which a first detection unit (200A) and a first temperature measurement unit (500A) are connected, and a second movable stage unit (600B) to which a second detection unit (200B) and a second temperature measurement unit (500B) are connected.

[0074] For example, the induction heating unit (300) may be positioned at the bottom of the electrode sheet (1), and the detection unit (200) may be positioned at the top of the electrode sheet (1). In addition, the temperature measuring unit (500) may be positioned at the top of the electrode sheet (1), and may be integrally connected with the detection unit (200), as described above.

[0075] Figure 8 is a schematic diagram showing an upper moving rail and a lower moving rail.

[0076] Referring to FIG. 8, an electrode rolling device (1000) according to one embodiment of the present invention may include an upper moving rail (700) and a lower moving rail (800).

[0077] Referring to FIGS. 1, 2 and 8, the upper moving rail (700) may include a first vertical moving rail (710) positioned above the electrode sheet (1) and extending in a first direction (L1) along the moving direction (M) of the electrode sheet (1), and a first horizontal moving rail (720) extending in a second direction (L2) along the width direction of the electrode sheet (1).

[0078] In addition, the lower moving rail (800) may include a second vertical moving rail (810) located at the lower portion of the electrode sheet (1) and extending in a first direction (L1) along the moving direction (M) of the electrode sheet (1), and a second horizontal moving rail (820) extending in a second direction (L2) along the width direction of the electrode sheet (1).

[0079] For example, the detection unit (200) can be connected to an upper moving rail (700) and moved, and the induction heating unit (300) can be connected to a lower moving rail (800) and moved.

[0080] In addition, the temperature measuring unit (500) is connected to the detection unit (200), so that the detection unit (200) and the temperature measuring unit (500) can move together along the upper moving rail (700). For example, a moving stage unit (600) connecting the temperature measuring unit (500) and the detection unit (200) can be connected to the upper moving rail (700) and move.

[0081] In the present invention, the movement direction (M) of the electrode sheet (1) and the first direction may be the same direction, and the width direction of the electrode sheet and the second direction may be the same direction.

[0082] According to the above, the detection unit (200), the induction heating unit (300), and the temperature measurement unit (500) according to the present invention can be arranged to be movable in the first and second directions (or the movement direction and width direction of the electrode sheet).

[0083] In one specific example, the induction heating unit (300) may include a coil box (310) having an induction coil (311) built in and a power supply unit (320) that supplies power so that the induction coil (311) is heated. In addition, the control unit (400) may control the movement of the coil box (310) so that the induction coil (311) is aligned with a preset alignment line along the length direction of the electrode sheet (1) between one side of the non-conductive portion (1-1) adjacent to the holding portion (1-2) and the other side opposite to the one side.

[0084] One side of the above-mentioned non-conductive portion (1-1) may mean, for example, a boundary area between the maintenance portion (1-2) and the non-conductive portion (1-1), and the other side of the non-conductive portion (1-1) may mean both edges along the width direction of the electrode sheet (1).

[0085] For example, the alignment line may be set on one side of the unmaintained portion (1-1), i.e., on the boundary area between the retained portion (1-2) and the unmaintained portion (1-1).

[0086] For example, the alignment of the induction coil (311) can be performed by manual alignment or automatic alignment, and the induction coil (311) can be automatically aligned by controlling the movement of the coil box (310) through the control unit (400), or the induction coil (311) can be manually aligned by having the operator directly move the coil box (310) or directly operating a switch that controls the movement of the coil box (310).

[0087] The above control unit (400) can control the movement of the coil box (310) so that the heating area (310-1) heated by the induction coil (311) is located within the width (W) of the non-heating area (1-1) having a predetermined width (W).

[0088] More specifically, the coil box (310) has one side facing the non-heated portion (1-1), and at least a portion of the one side may include a heating area (310-1) heated by an induction coil (311). The control unit (400) may control the movement of the coil box (310) so that, for example, the heating area (310-1) is located within the width (W) of the non-heated portion (1-1).

[0089] The above control unit (400) can minimize the section where the non-heated portion (1-1) does not receive heat by controlling the movement of the coil box (310) so that the induction coil (311) is positioned within the width (W) of the non-heated portion (1-1). In addition, the control unit (400) can control the power supply amount of the power supply unit (320) to control the heating temperature of the induction coil (311), thereby heating the temperature of the non-heated portion (1-1) to a desired level.

[0090] One embodiment of the present invention relates to an electrode rolling method. The electrode rolling method utilizes the aforementioned electrode rolling device, and a detailed description that overlaps with the aforementioned content will be omitted.

[0091] Specifically, the electrode rolling method can utilize an electrode rolling device (1000) including a rolling unit (10) that rolls an electrode sheet (1) including a non-coated portion (1-1) and a retaining portion (1-2) coated with electrode slurry.

[0092] The above electrode rolling method may include a moving step of moving an electrode sheet (1) to a rolling unit (10), a detection step of detecting the position of a non-coated portion (1-1) of the electrode sheet (1) moving to the rolling unit (10), an induction heating step of inductively heating the non-coated portion (1-1) which is provided to be movable in the moving direction of the electrode sheet, and a control step of controlling the movement of the induction heating unit (300) so that the induction heating unit (300) is positioned at the position of the detected non-coated portion (1-1).

[0093] The above electrode rolling method can minimize the section where the non-heated portion (1-1) is not heated by controlling the heating position of the induction heating portion (300) by reflecting the change in position of the non-heated portion (1-1) or the moving speed of the electrode sheet (1).

[0094] In one example, the control step may control the movement of the induction heating unit (300) based on the movement speed of the electrode sheet (1).

[0095] Specifically, the control step may include a first mode step for controlling the movement of the induction heating unit (300) to heat the uncoated portion (1-1) at a fixed position when the moving speed of the electrode sheet (1) is a preset standard moving speed, and a second mode step for controlling the movement of the induction heating unit (300) to inductively heat the uncoated portion (1-1) while moving at a predetermined speed in the same direction as the moving direction (M) of the electrode sheet (1) when the moving speed of the electrode sheet (1) is equal to or greater than the preset standard moving speed.

[0096] In another example, the method may include a temperature measurement step of measuring the temperature of the ignorance portion (1-1).

[0097] The above control step can control the temperature of the induction heating part (300) based on the temperature of the non-heating part (1-1) measured in the temperature measurement step.

[0098] The preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and those skilled in the art having ordinary knowledge of the present invention will be able to make various modifications, changes, and additions within the spirit and scope of the present invention, and such modifications, changes, and additions should be considered to fall within the scope of the following claims.

[0099] According to an electrode rolling device and an electrode rolling method according to one embodiment of the present invention, the heating position of the induction heating portion can be adjusted by reflecting a change in the position of the unheated portion of the electrode sheet or the moving speed of the electrode sheet.

Claims

1. An electrode rolling device including a rolling section for rolling an electrode sheet including a bare section not coated with electrode slurry and a holding section coated with electrode slurry, A moving part that moves the electrode sheet to the rolling part; A detection unit that detects the position of the uncoated portion of the electrode sheet moving to the rolling unit; An induction heating unit that is provided to be movable in the direction of movement of the electrode sheet and inductively heats the non-conductive portion; and An electrode rolling device, comprising a control unit that controls the movement of an induction heating unit so that the induction heating unit is positioned at the location of the detected non-heating portion.

2. An electrode rolling device according to claim 1, wherein the control unit controls the movement of the induction heating unit based on the movement speed of the electrode sheet.

3. In the second paragraph, the control unit, A first mode for controlling the movement of the induction heating part to heat the non-heating part at a fixed position when the movement speed of the electrode sheet is a preset standard movement speed; and An electrode rolling device comprising a second mode for controlling the movement of an induction heating section to inductively heat a non-heating section while moving at a predetermined speed in the same direction as the movement direction of the electrode sheet when the movement speed of the electrode sheet is greater than a preset standard movement speed.

4. An electrode rolling device according to claim 1, further comprising a temperature measuring unit for measuring the temperature of the non-conductive portion.

5. In the fourth paragraph, the control unit controls the temperature of the induction heating unit based on the measured temperature of the unheated portion, an electrode rolling device.

6. An electrode rolling device in accordance with claim 4, wherein the temperature measuring unit is connected to the detection unit and moves integrally with it.

7. In the first paragraph, an upper moving rail including a first vertical moving rail positioned on the upper portion of the electrode sheet and extending in a first direction along the moving direction of the electrode sheet, and a first horizontal moving rail extending in a second direction along the width direction of the electrode sheet; and A lower moving rail is provided, which is located at the bottom of the electrode sheet and includes a second vertical moving rail extending in a first direction along the moving direction of the electrode sheet, and a second horizontal moving rail extending in a second direction along the width direction of the electrode sheet. The above detection unit is connected to the upper moving rail and moves, An electrode rolling device in which the above induction heating unit is connected to a lower moving rail and moves.

8. In the first paragraph, the induction heating unit comprises a coil box having an induction coil built in; and Includes a power supply unit that supplies power to heat the induction coil, An electrode rolling device, wherein the control unit controls the movement of the coil box so that the induction coil is aligned with a preset alignment line along the length direction of the electrode sheet between one side of the non-conductive portion adjacent to the maintenance portion and the other side opposite to the one side.

9. An electrode rolling method using an electrode rolling device including a rolling section for rolling an electrode sheet including a bare section not coated with electrode slurry and a holding section coated with electrode slurry, A moving step for moving the electrode sheet to the rolling section; A detection step for detecting the position of the uncoated portion of an electrode sheet moving to a rolling section; An induction heating step that is arranged to be movable in the direction of movement of the electrode sheet and inductively heats the non-conductive part; and An electrode rolling method, comprising a control step of controlling the movement of an induction heating unit so that the induction heating unit is positioned at the location of the detected non-heating portion.

10. An electrode rolling method according to claim 9, wherein the control step controls the movement of the induction heating section based on the movement speed of the electrode sheet.

11. In the 10th paragraph, the control step, A first mode step for controlling the movement of the induction heating part to heat the non-heating part at a fixed position when the moving speed of the electrode sheet is a preset standard moving speed; and An electrode rolling method, comprising a second mode step of controlling the movement of an induction heating section to inductively heat a non-heating section while moving at a predetermined speed in the same direction as the movement direction of the electrode sheet when the movement speed of the electrode sheet is greater than a preset standard movement speed.

12. An electrode rolling method, comprising a temperature measuring step of measuring the temperature of the non-conductive part in the 9th paragraph.

13. An electrode rolling method in claim 12, wherein the control step controls the temperature of the induction heating section based on the temperature of the non-heating section measured in the temperature measuring step.

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