Sheet winding apparatus and sheet winding method

Abstract

A sheet winding device according to embodiments of the present disclosure comprises a supply unit for supplying a sheet, a sheet table that supports a sheet and a unit cell and includes a reference plane in front of it in the direction of sheet transport, a support unit movable between a standby position and a cutting position, a cell table provided separately from the support unit and supporting a unit cell, a cutting unit mounted on the sheet table and moving integrally with the sheet table, a first chuck and a second chuck for moving the sheet and the unit cell, and a controller, wherein the end of the sheet at the standby position may coincide with the reference plane.

Description

Technology Field

[0001] The present disclosure relates to a sheet winding device and a sheet winding method. Background Technology

[0002] The secondary battery manufacturing process largely includes electrode manufacturing, assembly and activation, and packaging stages. In the electrode manufacturing stage, positive and negative electrodes are made and coated to form the basic structure of the battery, and in the assembly stage, battery cells are assembled by stacking or winding electrodes and separators. Subsequently, the final product is produced through activation and packaging stages, which include processes such as charging, discharging, and inspection.

[0003] When forming battery cells during the assembly stage, the positive electrode, negative electrode, and separator are arranged through stacking or rolling. Alternatively, if necessary, the exterior of the unit cell, in which the positive electrode, negative electrode, and separator are assembled, is wrapped with a separate protective sheet. However, in conventional processes for winding sheet materials such as separators or protective materials, the sheet is cut at an appropriate location without a fixed cutting standard, or the cutting position of the cutter is cut electrically without a physical standard.

[0004] As a result, the cutting position of the sheet is not consistently managed, leading to a decrease in the quality of the manufactured unit cell. For example, since the end of the sheet where it is wound is not always cut at the same location, the overlap position and shape of the sheet vary for each unit cell. Consequently, the wound sheet may fail to properly cover part of the unit cell or, conversely, overlap unnecessarily, causing variations in sheet thickness. This results in inconsistent protection of the unit cell by the separator or protective member, which can lead to variations in battery performance. In particular, depending on the cutting position, the sheet may be insufficient or excessive in specific areas, causing variations in battery characteristics (e.g., internal resistance). Furthermore, excessive overlap of the sheet increases the volume of the unit cell, which reduces the battery's packaging efficiency and negatively impacts the quality of applications where miniaturization is critical (such as smartphones).

[0005] Furthermore, if the sheet is not cut at a uniform location, wrinkling, separation, or delamination may occur at the edges. In particular, if the sheet ends are not properly aligned or lifted, the unit cells become vulnerable to external impact or heat, which can lead to reduced durability. Additionally, alignment and post-processing may be required during the assembly stage, resulting in additional manufacturing costs and time; moreover, this can hinder process automation and make quality control difficult. Moreover, this leads to an increase in product defect rates and a decrease in overall production yield, ultimately resulting in higher manufacturing costs.

[0006] Therefore, to solve these problems, a technique to maintain a constant cutting position is required.

[0007] The information described above disclosed in the background technology of this invention is intended only to enhance understanding of the background of the present invention and may therefore include information that does not constitute prior art. Prior art literature

[0008] Korean Published Patent Application 10-2024-0044892 The problem to be solved

[0009] The present disclosure is intended to solve the aforementioned problems, and by maintaining a constant cutting position of the sheet during the assembly process of a secondary battery, the battery performance can be maintained at a consistent high quality and the efficiency of the production process can be improved.

[0010] However, the technical problems that the embodiments of the present disclosure aim to solve are not limited to those described above, and other unmentioned problems can be clearly understood by a person skilled in the art from the description of the invention below. means of solving the problem

[0011] A sheet winding device according to embodiments of the present disclosure comprises a supply unit for supplying a sheet, a sheet table that supports a sheet and a unit cell and includes a reference plane in front of it in the direction of sheet transport, a support unit movable between a standby position and a cutting position, a cell table provided separately from the support unit and supporting a unit cell, a cutting unit mounted on the sheet table and moving integrally with the sheet table, a first chuck and a second chuck for moving the sheet and the unit cell, and a controller, wherein the end of the sheet at the standby position may coincide with the reference plane.

[0012] When the sheet table on which the unit cell and the sheet are placed reaches a cutting position, the controller moves the unit cell and the sheet in the sheet travel direction using the first chuck, and the cutting part can move up and down along the reference plane at the cutting position and cut the sheet based on a cutting line formed along the reference plane.

[0013] The above cutting section includes a first cutting section comprising a first blade in contact with the reference surface and a second cutting section comprising a second blade spaced apart from the reference surface, and the cutting line is spaced apart from the reference surface, and the first cutting section and the second cutting section can cut the sheet based on the cutting line while moving up and down in opposite directions.

[0014] The above controller moves the sheet table on which the unit cell is placed from the waiting position to the cutting position, and moves the unit cell from the cutting position to the winding position using the first chuck, and the waiting position, the cutting position, and the winding position are positioned in order along the sheet forward direction, and the distance between the cutting position and the winding position may correspond to the length of the sheet wound on the unit cell.

[0015] The above controller can move the unit cell and the sheet from the winding position to the cutting position using the above second chuck to wind the sheet onto the unit cell, and when the unit cell reaches the cutting position, the sheet can be cut by the cutting part.

[0016] The distance between the above cutting position and the above winding position can satisfy the following mathematical formula 1.

[0017] [Mathematical Formula 1]

[0018]

[0019] (In Equation 1, x represents the bottom surface length of the unit cell, y represents the side height of the unit cell, and z represents the top surface length of the unit cell. Additionally, in Equation 1, a is a natural number greater than or equal to 2, and b satisfies a < b < a+1.)

[0020] A sheet winding method according to embodiments of the present disclosure may include the steps of: positioning a sheet on a support member in a waiting position; moving the support member to a cutting position; positioning a unit cell on the support member; moving the unit cell and the sheet; winding the sheet onto the unit cell; cutting the sheet; trimming the cut end of the sheet; and moving the support member to a waiting position.

[0021] The step of positioning the sheet on a support member in a waiting position may involve positioning the end of the sheet on the end of the sheet table of the support member, and the step of moving the support member to a cutting position may involve positioning the end of the sheet on a reference plane of the sheet table located in front in the direction of sheet progression.

[0022] The step of moving the unit cell and the sheet involves moving the unit cell and the sheet from a cutting position to a winding position, and the waiting position, the cutting position, and the winding position are positioned in order along the sheet's direction of travel, and the distance between the cutting position and the winding position may correspond to the length of the sheet being wound onto the unit cell.

[0023] The step of winding a sheet onto the unit cell involves moving the unit cell and the sheet from the winding position to the cutting position to wind the sheet onto the unit cell, and the step of cutting the sheet involves cutting the sheet with a cutting part mounted on the reference plane when the unit cell reaches the cutting position.

[0024] The distance between the above cutting position and the above winding position can satisfy the following mathematical formula 1.

[0025] [Mathematical Formula 1]

[0026]

[0027] (In Equation 1, x represents the bottom surface length of the unit cell, y represents the side height of the unit cell, and z represents the top surface length of the unit cell. Additionally, in Equation 1, a is a natural number greater than or equal to 2, and b satisfies a < b < a+1.)

[0028] The step of trimming the cut end of the sheet above may involve attaching the cut end of the sheet to either of the two sides of the unit cell. Effects of the invention

[0029] The sheet winding device and sheet winding method according to the embodiments of the present disclosure can improve sheet winding quality and increase productivity by uniformly managing the length of the sheet during sheet feeding, cutting, and winding.

[0030] The sheet winding device and sheet winding method according to the embodiments of the present disclosure can improve cutting quality by allowing the cutting part to move integrally with the support part.

[0031] The sheet winding device and sheet winding method according to the embodiments of the present disclosure can easily and uniformly manage the length of the sheet by providing a support member with a physical reference for the supply, cutting, and winding positions of the sheet. Brief explanation of the drawing

[0032] The following drawings attached to this specification illustrate embodiments of the present invention and serve to facilitate an understanding of the technical concept of the present invention in conjunction with the description of the invention provided below. The present invention is not to be interpreted as being limited to the matters described in the drawings. FIG. 1 shows a sheet winding device according to embodiments of the present disclosure. FIG. 2 illustrates a sheet winding method according to embodiments of the present disclosure. FIGS. 3 and 4 show a support and a cutting portion according to embodiments of the present disclosure. FIGS. 5–16 illustrate the operation of a sheet winding device according to embodiments of the present disclosure. Figure 5 shows the state where the support member is in the standby position. Figure 6 shows the state where the support is in the cutting position. FIG. 7 shows the state in which the first vessel transfers a unit cell from the cell table. Figure 8 shows the state in which the unit cell is placed on the sheet table. FIG. 9 shows the state in which the first rack moves the unit cell to the winding position. Figure 10 shows the state in which the second vessel supports the unit cell. FIG. 11 shows the state in which the second chuck winds a sheet onto a unit cell. FIG. 12 shows the state in which the second chuck has moved the unit cell to the cutting position. Figure 13 shows the state in which the cutting part cuts the sheet. Figure 14 shows the state in which the finishing part organizes the sheet wound in the unit cell. Figure 15 shows the state in which the finishing part attaches the cut end of the sheet to the unit cell. Figure 16 shows a state in which the support member moves to a standby position and the first vessel transports the unit cell. Specific details for implementing the invention

[0033] Embodiments of the present disclosure and methods for achieving them may be more easily understood by referring to the detailed description of the embodiments together with the accompanying drawings. Embodiments are described in detail below with reference to the accompanying drawings. However, the described embodiments are subject to various modifications and may be implemented in different forms and are not to be interpreted as being limited to the embodiments described herein. Furthermore, the features of each of the various embodiments of the present disclosure may be combined with one another wholly or partially, and technically, various interlocking and operation are possible. Each embodiment may be implemented independently of one another or combined and implemented together. The described embodiments are provided as examples to make the present disclosure complete and to fully convey the spirit of the present disclosure to those skilled in the art. The present disclosure should be understood to include all variations and equivalents and substitutions are possible within the spirit and scope of the present disclosure. Accordingly, processes, components, and techniques that are not necessary to a person skilled in the art for a complete understanding of the embodiments of the present disclosure may not be described.

[0034] Unless otherwise noted, the same reference numerals, characters, or combinations thereof throughout the attached drawings and descriptions represent the same components, and descriptions thereof are omitted. Additionally, irrelevant parts may be omitted from the drawings to clarify the explanation when describing the embodiments.

[0035] The areas depicted in the drawings are schematic and their shapes do not represent or limit the actual shape of the device area. Relative sizes of elements, layers, and areas in the drawings may be exaggerated for clarity. Additionally, the use of hatching and / or shading in the attached drawings may generally be provided to clarify the boundaries between adjacent elements. Therefore, unless specifically limited, the presence or absence of hatching or shading does not indicate a preference or requirement for a particular material, material properties, dimensions, proportions, commonalities between the depicted elements, or other characteristics, attributes, properties, etc.

[0036] Various embodiments are described herein with reference to cross-sectional examples, which are schematic examples of embodiments and / or intermediate structures. For example, the shapes in the drawings may vary as a result of manufacturing techniques and / or tolerances. Furthermore, specific structural or functional descriptions disclosed herein are merely examples for explaining embodiments according to the concept of the present disclosure. Accordingly, the embodiments disclosed herein should be interpreted as not being limited to the shapes of the illustrated areas and including variations in shape due to manufacturing processes, etc.

[0037] Specific details may be provided in the specification to facilitate understanding of various embodiments. Alternatively, various embodiments may be implemented without specific details or with one or more details. In other cases, well-known structures and devices may be illustrated in the form of block diagrams to avoid unnecessarily obscuring various embodiments.

[0038] To facilitate explanation and to describe the relationship between one element or feature and another element or feature as illustrated in the drawings, spatially relative terms such as "below," "above," "lower," and "upper" may be used. Spatially relative terms are intended to include various directions of the device in use or operation in addition to the directions depicted in the drawings. For example, if the device in the drawings is inverted, another element or feature described as "below" or "lower" will face "above" the other element or feature. Thus, as exemplary terms, "below" and "lower" may include both upper and lower directions. The device may face other directions (e.g., a 90-degree rotation or other directions), and spatially relative descriptions used herein should be interpreted accordingly. Likewise, if it is stated that the first part is positioned "above" the second part, this means that the first part is positioned on the upper or lower side of the second part.

[0039] Additionally, the expression “viewed in plan” means the case where the object is viewed from above, and the expression “in a schematic section” means the case where a schematic section is taken by cutting the object vertically or horizontally. The term “viewed in side” means that the first object may be above, below, or to the side of the second object, and vice versa. Furthermore, the terms “overlap” or “superimposition” may include layer, stack, plane, extension, cover, or partial cover, or any other suitable term that a person skilled in the art understands and can understand. The expression “not overlapping” may include meanings such as “away from” or “separated from” and any other suitable equivalents recognized and understood by a person skilled in the art. The terms “plane” and “surface” may mean that the first object may be directly or indirectly opposite the second object. In the case where a third object is located between a first object and a second object, the first object and the second object may be understood as facing each other but indirectly opposing each other.

[0040] When an element, layer, region, or component (hereinafter also referred to as "element, etc.") is described as being "formed," "connected," or "combined" with another element, etc., this includes the possibility that it may be directly formed in the element, etc., formed in the other element, etc., indirectly formed in the other element, etc., connected, or combined. Furthermore, "formed," "connected," or "combined" may collectively refer to direct or indirect combination or connection of elements, etc., or integral or non-integral combination or connection, so that one or more elements, etc. may exist. For example, when an element, etc. is described as being "electrically connected" or "electrically combined" with another element, etc., this includes the possibility that it may be directly electrically connected or combined with the other element, etc., or that other elements, etc. exist. However, "direct connection" or "direct combination" means that one element, etc. is directly connected or combined with another element, etc., without an intermediate element, etc., or is located in another element, etc. Additionally, in this specification, when a part of a layer, film, region, guide plate, etc., is formed in another part, the direction of formation is not limited to the upward direction, but includes the possibility that the part is formed on the side or bottom. Conversely, when a part of a layer, film, region, guide plate, etc. is formed "below" another part, it includes not only the case where that part is "immediately below" the other part, but also the case where there is another part between the part and the other part. Meanwhile, other expressions describing the relationship of elements, such as "between," "immediately between," or "adjacent to" and "immediately adjacent to," may be interpreted similarly. Furthermore, when an element, etc. is referred to as being between two elements, etc., it may be the only element, etc. between the two elements, etc., or there may be another element, etc. between them.

[0041] Expressions such as “at least one” or “any one” do not limit the order of individual elements. For example, “at least one of X, Y, and Z,” “at least one of X, Y, or Z,” and “at least one selected from the group consisting of X, Y, and Z” may include X alone, Y alone, Z alone, or any combination of two or more of X, Y, and Z. Similarly, expressions such as “at least one of A and B” and “at least one of A or B” may include A, B, or A and B. In this specification, the term “and / or” generally includes any combination of one or more related list items. For example, expressions such as “A and / or B” may include A, B, or A and B.

[0042] Terms such as "first," "second," and "third" may be used herein to describe various elements, but such elements are not limited by these terms. These terms are used to distinguish one element, etc. from another. Accordingly, the first element, etc. described below may be referred to as the second, etc. without departing from the spirit and scope of the invention. Describing an element as the "first" element does not require or imply the existence of a second element or other elements. Terms such as "first," "second," etc. may also be used in this specification to distinguish different categories or sets of elements, etc. For clarity, terms such as "first," "second," etc. may each represent "first category (or first set)," "second category (or second set)," etc.

[0043] The terms used herein are used merely to describe specific embodiments and are not intended to limit the disclosure. Singular expressions used herein may include plural expressions, and plural expressions may include singular forms unless the context clearly indicates otherwise. The terms “include,” “comprising,” and “have” mean to specify the presence of the features, integers, and steps specified herein. These expressions do not exclude the presence or addition of one or more other functions, steps, operations, components, and / or groups thereof.

[0044] Where one or more embodiments may be implemented differently, a specific process sequence may be performed differently from the described order. For example, two processes described consecutively may be performed substantially simultaneously or in the reverse order of the described order.

[0045] The terms "substantially," "approximately," "roughly," and similar terms are used as terms of approximation rather than terms of degree, and signify satisfying the range of implied deviation of the measured or calculated value (e.g., the range of deviation due to the limitations of the measurement system). For example, "approximately" may mean within one or more standard deviations or within ±30%, ±20%, ±10%, or ±5% of the specified value.

[0046] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with that meaning in the context of the relevant technology and / or this specification, and should not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0047] FIG. 1 shows a sheet winding device (10) according to embodiments of the present disclosure, FIG. 2 shows a sheet winding method according to embodiments of the present disclosure, FIG. 3 and FIG. 4 show a support part (200) and a cutting part (300) according to embodiments of the present disclosure, FIG. 5-16 show the operation of a sheet winding device (10) according to embodiments of the present disclosure. FIG. 5 shows a state where the support member (200) is in a standby position, FIG. 6 shows a state where the support member (200) is in a cutting position, FIG. 7 shows a state where the first chuck (400) is transferring the unit cell (C) from the cell table (500), FIG. 8 shows a state where the unit cell (C) is placed on the sheet table (210), FIG. 9 shows a state where the first chuck (400) has moved the unit cell (C) to the winding position, FIG. 10 shows a state where the second chuck (600) supports the unit cell (C), FIG. 11 shows a state where the second chuck (600) is winding the sheet (S) onto the unit cell (C), FIG. 12 shows a state where the second chuck (600) has moved the unit cell (C) to the cutting position, FIG. 13 shows a state where the cutting member (300) is cutting the sheet (S), and FIG. 14 shows the end member (700) wound onto the unit cell (C). Figure 15 shows the state in which the sheet (S) is organized, Figure 15 shows the state in which the finishing part (700) attaches the cut end SE of the sheet (S) to the unit cell (C), and Figure 16 shows the state in which the support part (200) moves to a standby position and the first chuck (400) transports the unit cell (C).

[0048] A sheet winding device (10) according to embodiments of the present disclosure may be a device for winding a sheet (S) onto a secondary battery (or a unit cell of a secondary battery). The sheet winding device (10) may be included in a secondary battery manufacturing system. For example, the sheet winding device (10) may be a device for winding a sheet (S) onto a unit cell (C) in which a separator and an electrode are stacked through a lamination process. Here, the lamination process may be an assembly method in which the separator and the electrode are stacked alternately. Alternatively, the sheet winding device (10) may be a device for winding a sheet (S) onto a unit cell (C) in which a separator and an electrode are stacked through a Z-stacking (or Zigzag stacking) process. The sheet (S) may be made of the same material as the separator included in the unit cell (C), or it may be a separate protective member distinct from the separator to protect the unit cell (C) from external impact or foreign substances. For example, the sheet (S) may be a polyolefin type such as polypropylene (PP) or polyethylene (PE), or may be a polyolefin coated with alumina or silica, or may be in the form of multiple layers of polyolefin laminated, or may include aramid, polyamide, etc. The unit cell (C) in which the sheet (S) is wound by the sheet winding device (10) according to the embodiments of the present disclosure may be in a state after the separator and electrode are alternately laminated through a lamination process or a Z-stacking process. In the case of the unit cell (C) that has undergone the Z-stacking process, the cut separator may be attached to the outside of the unit cell (C). For example, the sheet winding method according to the embodiments of the present disclosure may be performed after the assembly process of the separator and electrode is completed.

[0049] A sheet winding device (10) according to embodiments of the present disclosure comprises a supply unit (100) for supplying a sheet (S), a sheet table (210) that supports the sheet (S) and a unit cell (C) and includes a reference plane (211) in front of it in the direction of sheet transport, a support unit (200) that is movable between a standby position and a cutting position, a cell table (500) that is provided separately from the support unit (200) and supports the unit cell (C), a cutting unit (300) that is mounted on the sheet table (210) and moves integrally with the sheet table (210), a first chuck (400) and a second chuck (600) that move the sheet (S) and the unit cell (C), and a controller (800), wherein the end of the sheet (S) at the standby position may coincide with the reference plane (211).

[0050] A sheet winding device (10) according to embodiments of the present disclosure may include a supply unit (100), a support unit (200), a cutting unit (300), a first chuck (400), a cell table (500), a second chuck (600), a finishing unit (700), and a controller (800).

[0051] The supply unit (100) can transport a sheet (S). The supply unit (100) can transport the sheet (S) in conjunction with the operation of other components of the sheet winding device (10) (e.g., support unit (200), cutting unit (300), first chuck (400), cell table (500), second chuck (600), and finishing unit (700)). The supply unit (100) can adjust the length of the supplied sheet (S) by unwinding or winding the sheet (S) wound on the supply unit (100). For example, the supply unit (100) can increase the length of the supplied sheet (S) by unwinding the sheet (S) in accordance with the movement of the support unit (200) from a standby position to a cutting position, or the first chuck (400) moving while gripping the unit cell (C) and the sheet (S). Alternatively, the supply unit (100) can reduce the length of the supplied sheet (S) by winding the sheet (S) in accordance with the support unit (200) moving from the cutting position to the waiting position.

[0052] The supply unit (100) may include an unwinder (110), a transfer roller (120), a dancer roll (130), a control motor (140), a guide bar (150), and a feeder (160).

[0053] The unwinder (110) has a sheet (S) wound on it and can unwind the wound sheet (S) by rotating it clockwise or counterclockwise. For example, as shown in FIG. 1, the unwinder (110) may have a cylindrical shape and may have a sheet (S) wound on its outer surface. As the unwinder (110) rotates, the sheet (S) wound on the unwinder (110) is unwound, and the unwound sheet (S) can be transported to a feeder (160) along a transfer roller (120).

[0054] The transfer roller (120) is located between the unwinder (110) and the feeder (160) and can supply the sheet (S) unwound from the unwinder (110) to the feeder (160). The transfer roller (120) may include a plurality of transfer rollers (120) (e.g., three). The plurality of transfer rollers (120) are arranged so that the transfer direction of the sheet (S) is opposite, and can transfer the sheet (S) to the feeder (160) while rotating. The plurality of transfer rollers (120) may be arranged along the height direction (e.g., the Z-axis direction in FIG. 1) of the sheet winding device (10).

[0055] The dancer roll (130) can adjust the tension applied to the sheet (S). The dancer roll (130) is supported by a guide bar (150) and can press the sheet (S) by the force applied by the guide bar (150) by the control motor (140). The tension exerted by the dancer roll (130) can be adjusted by the control motor (140) according to the position of the sheet (S) or the operation of the sheet winding device (10). For example, the control motor (140) can move the guide bar (150) outward (left side of FIG. 1) to increase the tension applied by the dancer roll (130) to the sheet (S) (left dotted line of FIG. 1). Or, the control motor (140) can move the guide bar (150) inward (right side of FIG. 1) to decrease the tension applied by the dancer roll (130) to the sheet (S) (right dotted line of FIG. 1). The control motor (140) can adjust the tension applied by the dancer roll (130) to the sheet (S) in conjunction with the operation of the support part (200), the cutting part (300), the first chuck (400), and the second chuck (600).

[0056] The feeder (160) can transport the sheet (S) supplied by the transfer roller (120) to the support member (200) or retrieve it from the support member (200). The feeder (160) can move the sheet (S) while rotating clockwise or counterclockwise. For example, when the unwinder (110) rotates and the sheet (S) is released from the unwinder (110), and the support member (200) moves from a standby position to a cutting position, the feeder (160) can rotate to increase the length of the sheet (S) supplied to the support member (200). Or, when the support member (200) returns from the standby position to the cutting position, the feeder (160) can rotate in the opposite direction to decrease the length of the sheet (S) supplied to the support member (200). By the feeder (160) rotating in the opposite direction, the sheet (S) can move over the feeder (160) or to the transfer roller (120). Alternatively, if necessary, the unwinder (110) may also rotate in the opposite direction in conjunction with the operation of the feeder (160). At this time, the sheet (S) may be wound back onto the unwinder (110). As shown in FIG. 1, the feeder (160) includes a pair of rollers facing each other, and the sheet (S) may be positioned between them.

[0057] The support member (200) can support the sheet (S) and / or unit cell (C) supplied from the supply member (100). The support member (200) can serve as a physical reference for the position and / or distance at which the sheet (S) is supplied or cut. For example, when the first sheet (S) is supplied, the end of the sheet (S) may be positioned to correspond to the end of the support member (200) (the end of the sheet table (210)) in the standby position. Additionally, the support member (200) moves a distance corresponding to the length for winding the sheet (S) onto the unit cell (C) from the standby position, and this position may become the cutting position. Thus, the cutting position of the sheet (S) can always be kept constant solely by the movement of the support member (200). When the sheet (S) is wound onto the unit cell (C) and cut, the support member (200) can return to its original standby position. Thus, the position at which the sheet (S) is supplied can also always be kept constant.

[0058] The support member (200) may include a sheet table (210) and a clamp (220).

[0059] The sheet table (210) supports the sheet (S) and the unit cell (C) and may be movable. The sheet table (210) may be separate from the cell table (500) for lamination or stacking. The sheet table (210) may have a flat upper surface to support the sheet (S) and the unit cell (C) and may be movable in the direction of travel of the sheet (S) (or the X-axis direction of FIG. 1). The sheet table (210) may be movable by rails, conveyor belts, or gantry, etc.

[0060] The sheet table (210) can provide a reference plane (211) for positioning and cutting the sheet (S). For example, the end of the sheet (S) can be aligned with the reference plane (211) of the sheet table (210) and cut with respect to the reference plane (211) with respect to the front (or right side of FIG. 1) of the sheet table (210) in the direction of travel of the sheet (S). By providing a physical reference for managing the length of the sheet (S) in this way with the sheet table (210), the position of the sheet (S) can be managed consistently with high reliability even if the winding process of the sheet (S) is repeated.

[0061] The clamp (220) can support a sheet (S) and / or unit cell (C) placed on a sheet table (210). The clamp (220) may be movable in the height direction (or Z-axis direction of FIG. 1) of the sheet winding device (10) to be spaced apart from and approach the upper surface of the sheet table (210). Alternatively, the clamp (220) may be movable in the length direction (or the direction of travel of the sheet (S) or X-axis direction of FIG. 1) together with the sheet table (210) while pressing the sheet (S) and / or unit cell (C). The clamp (220) may support the sheet (S) and / or unit cell (C) using mechanical force or electromagnetic force, etc. For example, as shown in FIG. 3, the clamp (220) comprises a plurality of clamps (220), and at least one of the clamps (220) located in the forward direction of the sheet (S) among the plurality of clamps (220) may be placed on the sheet table (210) such that the end of the clamp (220) is aligned with the reference plane (211). The plurality of clamps (220) may support the sheet (S) by their own weight. The end surface of the clamp (220) in the forward direction of the sheet (S) may be aligned with the reference plane (211). The clamp (220) may prevent the sheet (S) and / or unit cell (C) from moving when the sheet table (210) moves, and may allow the sheet (S) to be aligned and cut with respect to the reference plane (211). The clamp (220) may be movable by rails, conveyor belts, or gantry, etc.

[0062] FIG. 3 shows four clamps (220) with two clamps (220) placed at the front and rear of the seat table (210), but the number of clamps (220) is not specifically limited. For example, one clamp (220) may be placed at the front and rear of the seat table (210). In this case, each clamp (220) may be arranged across the width direction of the seat table (210).

[0063] The cutting unit (300) can cut the sheet (S). The cutting unit (300) can cut the sheet (S), which has been wound onto the unit cell (C), at a designated location. The cutting unit (300) may include a blade or a laser oscillator. The cutting unit (300) may move together with the support unit (200). For example, when the support unit (200) is in a standby position or a cutting position, the cutting unit (300) may also be in a standby position or a cutting position. Additionally, when the support unit (200) moves, the cutting unit (300) may also move together. The cutting unit (300) may be connected to or mounted on the support unit (200). For example, as shown in FIG. 1, the cutting unit (300) may be mounted on the reference plane (211) of the sheet table (210). Thus, when the sheet table (210) is in a designated standby position and a cutting position, the cutting unit (300) may also be in a designated standby position and a cutting position. Therefore, the cutting length of the sheet (S) can be maintained stably.

[0064] The cutting unit (300) includes a blade (310) and can cut a sheet (S) placed on a sheet table (210). For example, as shown in FIG. 3 (a), the sheet (S) can be supported on the sheet table (210) by a clamp (220). Before the cutting process is performed, the blade (310) of the cutting unit (300) can be positioned below the sheet (S) while supported on the reference plane (211). Then, when the sheet table (210) moves to the cutting position, the cutting unit (300) can raise the blade (310) to cut the sheet (S). At this time, the cut end of the sheet (S) can be formed based on the reference plane (211). In this way, by supporting the blade (310) of the cutting unit (300) on the reference plane (211) of the sheet table (210), the sheet (S) can be cut more stably. A member for stably sliding the cutting part (300) may be provided on the reference surface (211). For example, rails and / or sliders for supporting the cutting part (300) may be provided on both edges of the reference surface (211) so that the cutting part (300) can move in a straight line in the cutting direction (or the Z-axis direction of FIG. 3 or the height direction of the sheet winding device (10)). The cutting part (300) may include a known drive unit (motor, gear, cylinder, etc.) for raising and lowering the blade (310) while supported on the sheet table (210).

[0065] The blade (310) of the cutting section (300) may be spaced apart from the reference plane (211). By spaced the blade (310) apart from the reference plane (211), it is possible to prevent the blade (310) from colliding with the reference plane (211) or the clamp (220) due to vibration or positional error when moving up and down.

[0066] As shown in FIG. 3(a), the blade (310) may be formed on one side of the upper portion of the cutting portion (300). The tip of the blade may be in contact with or close to the reference plane (211), and the inclined surface may face outward (or the direction of travel of the sheet (S)). Thus, the distance between the end of the sheet (S) that remains after cutting and the end of the sheet table (210) can be kept substantially zero or as small as possible.

[0067] The type and material of the blade (310) are not specifically limited and may vary depending on the thickness and material of the sheet (S). For example, the blade (310) may be a general blade type, a saw blade type, or include a wheel cutter. If the blade (310) includes a wheel cutter, the blade (310) can cut the sheet (S) while moving in the width direction (or the X-axis direction of FIG. 3) of the sheet (S). For example, the blade (310) may include structural steel of the steel series and may be plated with a high-hardness material. For example, the blade (310) may include tungsten carbide, high-speed steel, ceramic, diamond coating, DLC (Diamond-Like Carbon) coating, etc.

[0068] The cutting section (300) may include a plurality of cutting sections (300). For example, as shown in FIG. 4(a), the cutting section (300) may include a first cutting section (301) and a second cutting section (302). The first cutting section (301) is supported on a reference plane (211) and may be located below the sheet (S) before cutting is performed. The second cutting section (302) may be spaced apart from the reference plane (211). The second cutting section (302) is supported on a sheet table (210) (the reference plane (211) or another side of the sheet table (210) other than the reference plane (211)) and may be located above the sheet (S) before cutting is performed. The first cutting section (301) and the second cutting section (302) may cut the sheet (S) based on the cutting section CL while moving up and down in opposite directions. The first cutting section (301) can cut the sheet (S) by moving from bottom to top, and the second cutting section (302) can cut the sheet (S) by moving from top to bottom. As shown in FIG. 4(b), the first cutting section (301) and the second cutting section (302) face each other with respect to the cutting line CL, and may come into contact with each other or have an extremely small gap when cutting is performed. The cutting line CL may be spaced apart from the reference plane (211) by the thickness of the first cutting section (301). The position of the cutting line CL can be determined in advance by considering the thickness of the first cutting section (301) and the cutting position of the sheet (S). In this way, the two cutting sections (300) can cut the sheet (S) by moving in different directions, thereby improving the cutting quality of the sheet (S).

[0069] The first cutting section (301) may include a first blade (311) on one side of the upper portion, and the second cutting section (302) may include a second blade (312) on one side of the lower portion. The inclined surfaces of the first blade (311) and the second blade (312) may face in opposite directions.

[0070] Alternatively, some of the multiple cutting sections (300) may be fixed while others move to cut the sheet (S). For example, the first cutting section (301) may be fixed to the reference plane (211). The first blade (311) of the first cutting section (301) may be located below the sheet (S), in contact with the lower surface of the sheet (S), or at the same height as the upper surface of the sheet table (210). The second cutting section (302) may move downward and cut the sheet (S) together with the first cutting section (301). Thus, since only the second cutting section (302) needs to move, the configuration of the cutting section (300) becomes simple and the position control of the cutting section (300) is easy.

[0071] Alternatively, the second cutting part (302) may have its end rotatably connected to the sheet table (210) via a hinge. With the first cutting part (301) fixed, the second cutting part (302) can cut the sheet (S) by rotating like scissors. Thus, the sheet (S) can be cut more precisely by cutting from the side.

[0072] The first chuck (400) can transport a unit cell (C) and a sheet (S). Depending on the transport state of the sheet (S), the first chuck (400) can transport the unit cell (C) to the support member (200), move the unit cell (C) and the sheet (S) by gripping them, or transport the unit cell (C) with the sheet (S) wound onto it to the next process. For example, when the support member (200) moves to the cutting position, the first chuck (400) can move the unit cell (C) placed on the cell table (500) onto the sheet table (210) of the support member (200). After supporting the sheet (S) and the unit cell (C) together, the first chuck (400) can move in the direction of travel of the sheet (S) to extend the sheet (S) by the winding length for the unit cell (C). The first rack (400) can transfer the unit cell (C), in which the sheet (S) has been wound, to an activation process or a heat press process.

[0073] The first chuck (400) can support the unit cell (C) and the sheet (S) using one or more of a mechanical method, electromagnetic force, and sound pressure. For example, as shown in FIG. 1, the first chuck (400) includes a plurality of separated arms or hands, which can grip the unit cell (C) and the sheet (S) up and down. The end of the first chuck (400) may include an electromagnet or a suction chuck, etc., in the part facing the unit cell (C) and the sheet (S). The first chuck (400) may be movable by a roller, rail, conveyor belt, or gantry, etc. Alternatively, the first chuck (400) may be connected to a robot arm. For example, before the cutting process is performed, the first chuck (400) may be between the support member (200) and the second chuck (600).

[0074] The cell table (500) supports electrodes and separators during the lamination or stacking process and can support unit cells (C) after the process is completed. The cell table (500) may be a separate component distinct from the sheet table (210) of the support member (200). The cell table (500) is located adjacent to the cutting position of the sheet table (210), and when the sheet table (210) reaches the cutting position, the first chuck (400) can transport the unit cells (C) placed on the cell table (500) to the sheet table (210). When the cell table (500) is emptied, electrodes and separators can be laminated or stacked again on the cell table (500).

[0075] The second chuck (600) can move the unit cell (C) and the sheet (S) to wind the sheet (S) onto the unit cell (C). For example, the second chuck (600) receives the unit cell (C) and the sheet (S) from the first chuck (400) when the first chuck (400) moves by the winding length of the sheet (S) after gripping the unit cell (C) and the sheet (S). The second chuck (600) can wind the sheet (S) onto the unit cell (C) while moving in the opposite direction to the direction of travel of the sheet (S) (e.g., rotating). Through this process, the sheet (S) can be wound onto the upper surface, lower surface, and both sides of the unit cell (C). Here, the two sides may refer to the two sides on which the sheet (S) is wound by the movement (e.g., rotation) of the second chuck (600) among the four sides excluding the upper and lower surfaces of the unit cell (C). In addition, the remaining two sides of the unit cell (C) where the sheet (S) is not wound may be exposed.

[0076] When winding and cutting are completed, the second chuck (600) moves to a designated position and the finishing part (700) can attach the cut end SE of the sheet (S) to the outer surface of the unit cell (C).

[0077] The second chuck (600) can support the unit cell (C) and the sheet (S) using one or more of mechanical methods, electromagnetic force, and sound pressure. For example, the second chuck (600) may include a plurality of arms or hands spaced apart in the width direction (or the X-axis direction of FIG. 1) of the sheet (S), and may grip the unit cell (C) and the sheet (S) between them. That is, the second chuck (600) may grip each of the two ends in the width direction of the unit cell (C) and the sheet (S). The second chuck (600) may rotate (roll) the unit cell (C) and the sheet (S) so that the sheet (S) is wound onto the outer surface of the unit cell (C). The second chuck (600) may be movable by means of rollers, rails, conveyor belts, or gantry. Alternatively, the second chuck (600) may be connected to a robot arm. For example, before the cutting process is performed, the second chuck (600) may be located between the first chuck (400) and the finishing part (700).

[0078] The finishing unit (700) can organize the remaining portion of the sheet (S) wound on the unit cell (C). For example, as shown in FIG. 14, after the cutting unit (300) cuts the sheet (S), there is a cut end SE of the sheet (S) that remains unwound on the unit cell (C). The finishing unit (700) can press the outer surface of the sheet (S) wound on the unit cell (C) to tighten the sheet (S) and attach the cut end SE to the unit cell (C). The cut end SE can be attached to the sheet (S) that is already wound on the unit cell (C). The finishing unit (700) can move along the outer surface of the unit cell (C) (e.g., rotate clockwise). The finishing unit (700) can be moved by known transport means such as rails, conveyor belts, or gantry. Alternatively, the finishing unit (700) can be connected to a robot arm.

[0079] The finishing section (700) may include a pressure roller (710) and a brush (720). After winding and cutting the sheet (S), the pressure roller (710) may move toward the cut end SE while pressing the sheet (S) along the outer surface of the unit cell (C) where the sheet (S) is wound. As the pressure roller (710) presses the sheet (S), wrinkles remaining on the sheet (S) may be smoothed out. The brush (720) may be located behind the pressure roller (710) in the direction of travel of the finishing section (700). When the pressure roller (710) presses the sheet (S), the brush (720) sweeps the sheet (S) to press the sheet (S) against the unit cell (C) and remove foreign substances remaining on the outer surface of the unit cell (C). The brush (720) may move integrally with the pressure roller (710) or move separately.

[0080] If necessary, adhesive or the like may be applied to the brush (720), and the cut end SE may be attached to the side of the unit cell (C). Alternatively, the sheet winding device (10) may attach the cut end SE to the side of the unit cell (C) through a separate adhesive application device or tape attachment device.

[0081] The finishing portion (700) can be configured so that the cut end SE is attached to one of the two sides, rather than the upper or lower surface of the unit cell (C). If the cut end SE is located on the upper or lower surface of the unit cell (C), the unit cell (C) may not be pressed uniformly or the unit cell (C) may be damaged due to thickness variations of the sheet (S) during the subsequent pressing process of the unit cell (C). By ensuring that the cut end SE is attached to one of the two sides of the unit cell (C), the finishing portion (700) prevents such problems and allows the end of the sheet (S) to be positioned on a relatively wide side of the unit cell (C), thereby securing a large contact area.

[0082] The controller (800) can control other components of the sheet winding device (10) (e.g., supply unit (100), support unit (200), cutting unit (300), first chuck (400), cell table (500), second chuck (600), finishing unit (700)). The controller (800) can be connected via wired or wireless connection to other components of the sheet winding device (10) and / or external devices (e.g., a server or user terminal). The controller (800) can control the components to work together according to each operation of the sheet winding device (10).

[0083] When a user or a separate sheet transfer device positions the sheet (S) on the support member (200), the controller (800) can transmit a supply signal to the supply member (100). Upon receiving the supply signal, the supply member (100) can operate the unwinder (110) to unwind the sheet (S). Additionally, the feeder (160) can rotate in conjunction with the operation of the unwinder (110) to supply the sheet (S) toward the support member (200). Furthermore, the control motor (140) can detect the tension applied to the sheet (S) and move the guide bar (150) to control the position of the dancer roll (130). The controller (800) can control the supply member (100) to supply or retrieve the sheet (S) in conjunction with the transfer and cutting operations of the sheet (S). Additionally, the controller (800) can control the supply of a sheet (S) for winding the unit cell (160) to a set length through the feeder (160), etc.

[0084] When the sheet (S) is placed on the support member (200), the controller (800) can transmit a movement signal to the support member (200). Upon receiving the movement signal, the support member (200) can lower the clamp (220) to support the sheet (S) on the sheet table (210). Additionally, the support member (200) can move the sheet table (210) to a cutting position.

[0085] When the support member (200) reaches the cutting position CL, the controller (800) can transmit a transfer signal of the unit cell (C) to the first chuck (400). Upon receiving the transfer signal, the first chuck (400) can grasp the unit cell (C) placed on the cell table (500) and place it on the sheet (S) of the sheet table (210). Additionally, the controller (800) can cause the support member (200) to raise the clamp (220) when the first chuck (400) enters the sheet table (210), and to lower the clamp (220) again when the unit cell (C) is placed on the sheet (S).

[0086] When the unit cell (C) is placed on the sheet table (210), the controller (800) can transmit a transfer signal for the unit cell (C) and the sheet (S) to the first chuck (400). Upon receiving the transfer signal, the first chuck (400) can grasp the upper surface of the unit cell (C) and the sheet (S) placed below the unit cell (C) and move to the winding position. Additionally, the controller (800) can transmit a signal for raising the clamp (220) to the support member (200).

[0087] When the unit cell (C) reaches the winding position, the controller (800) can transmit a winding signal. Upon receiving the winding signal, the second chuck (600) receives the unit cell (C) from the first chuck (400) and rotates the unit cell (C) in the opposite direction of the sheet (S)'s movement to wind the sheet (S) onto the unit cell (C).

[0088] When the unit cell (C) reaches the vicinity of the cutting position, the controller (800) can transmit a cutting signal to the support member (200) and the cutting member (300). The support member (200) can lower the clamp (220) again to press the sheet (S) onto the sheet table (210). The cutting member (300) can cut the sheet (S) along the cutting line CL while lowering, raising, or rotating.

[0089] When the sheet (S) is cut, the controller (800) can transmit a cleanup signal. Upon receiving the cleanup signal, the finishing unit (700) presses the sheet (S) attached to the outer surface of the unit cell (C) with a pressure roller (710) and a brush (720), and can ensure that the cut end SE is attached to the side of the unit cell (C) rather than the top or bottom surface.

[0090] When the winding of the sheet (S) is completed, the controller (800) can transmit a return signal. Upon receiving the return signal, the support member (200) can transfer the sheet table (210) to a standby position while the clamp (220) presses the sheet (S). Additionally, the first chuck (400) upon receiving the return signal can receive the unit cell (C) from the second chuck (600) and transfer it to the outside of the sheet winding device (10) or to the next process.

[0091] When the sheet table (210) on which the unit cell (C) and the sheet (S) are placed reaches the cutting position, the controller (800) moves the unit cell (C) and the sheet (S) in the sheet forward direction with the first chuck (400), and the cutting unit (300) can move up and down along the reference plane (211) at the cutting position and cut the sheet (S) based on the cutting line CL formed along the reference plane (211).

[0092] The controller (800) can move the sheet table (210) on which the unit cell (C) is placed from a standby position to a cutting position, and move the unit cell (C) from the cutting position to a winding position using the first chuck (400). Here, the standby position, the cutting position, and the winding position may be positioned in order along the sheet progression direction (e.g., the Y-axis direction of FIG. 9 or the length direction of the sheet winding device (10). The distance between the cutting position and the winding position, i.e., the second distance D2, may correspond to the length of the sheet (S) wound on the unit cell (C).

[0093] Here, the second distance D2 can satisfy Equation 1 or Equation 2 depending on the position where the cut end SE of the sheet (S) is placed.

[0094] First, if the cut end SE is positioned on one side of the unit cell (C), for example, on the side closest to the support member (200) (the left side of the unit cell (C) as in FIG. 14), the second distance D2 can satisfy the following mathematical formula 1.

[0095] [Mathematical Formula 1]

[0096]

[0097] In Equation 1, x represents the length of the lower surface of the unit cell (C) (in the Y-axis direction with respect to FIG. 10), y represents the height of the side of the unit cell (C) (in the Z-axis direction with respect to FIG. 10), and z represents the length of the upper surface of the unit cell (C) (in the Y-axis direction with respect to FIG. 10). Also, in Equation 1, a is a natural number greater than or equal to 2, and b satisfies a < b < a+1.

[0098] Alternatively, although not shown in the drawing, if the cut end SE is positioned on any side of the unit cell (C), for example, the side furthest from the support (200) (right side based on FIG. 14), the second distance D2 can satisfy the following mathematical formula 2.

[0099] [Mathematical Formula 2]

[0100]

[0101] In Equation 2, x represents the length of the lower surface of the unit cell (C) (in the Y-axis direction based on FIG. 10), y represents the height of the side of the unit cell (C) (in the Z-axis direction based on FIG. 10), and z represents the length of the upper surface of the unit cell (C) (in the Y-axis direction based on FIG. 10). Also, in Equation 2, c is a natural number greater than or equal to 2, and d satisfies c+2 < d < c+3.

[0102] Accordingly, the end of the sheet (S) can be attached to either of the two sides (front and back sides in the direction of travel of the sheet (S)) rather than the upper or lower surface of the unit cell (C). Thus, a large contact area can be secured by positioning the end of the sheet (S) on the side of the unit cell (C) which is relatively wide. In addition, if the end of the sheet (S) is positioned on the upper or lower surface of the unit cell (C), the unit cell (C) may not be pressed uniformly or may be damaged due to variations in the thickness of the sheet (S) during the subsequent pressurization process; this can prevent such problems.

[0104] The controller (800) moves the unit cell (C) and the sheet (S) from the winding position to the cutting position using the second chuck (600) to wind the sheet (S) onto the unit cell (C), and when the unit cell (C) reaches the cutting position, the sheet (S) can be cut by the cutting part (300).

[0105] The controller (800) may utilize an integrated circuit structure that executes each control function through one or more microprocessors or other control devices, such as memory, a processor, a logic circuit, or a look-up table. The controller (800) may be implemented as part of a module, program, or code containing one or more executable instructions for executing a specific logic function. The controller (800) may include or be implemented by a processor, such as a central processing unit, that executes each function or microprocessor, etc. The controller (800) may include a communication device capable of transmitting and receiving data to and from external devices, etc. The communication device may include one or more combinations of a digital modem, an RF modem, an antenna circuit, a Wi-Fi chip, and related software and / or firmware.

[0106] The operation of a sheet winding device (10) and a sheet winding method according to embodiments of the present disclosure are described.

[0107] A sheet winding method according to embodiments of the present disclosure may include the steps of: positioning a sheet (S) on a support member (200) in a standby position; moving the support member (200) to a cutting position; positioning a unit cell (C) on the support member (200); moving the unit cell (C) and the sheet (S); winding the sheet (S) onto the unit cell (C); cutting the sheet (S); trimming the cut end of the sheet (S); and moving the support member (200) to a standby position.

[0108] First, as shown in FIG. 5, the sheet (S) is placed on the support member (200) in the waiting position. A user or a separate gripper places the sheet (S) on the sheet table (210) so that the end of the sheet (S) aligns with the reference plane (211). To allow the sheet (S) to move, the controller (800) transmits an unwinding signal to the unwinder (110) and the feeder (160), and as the unwinder (110) rotates, the sheet (S) is unwound and moved by the feeder (160) along the transfer roller (120). The support member (200) may be in the waiting position. The reference plane (211) of the sheet table (210) may provide a waiting line SL that serves as a reference for the waiting position of the end of the sheet (S) being supplied initially or the end of the sheet (S) that has been cut. The end of the sheet (S) may come into contact with the waiting line SL. A seat (S) is placed on a seat table (210), and a controller (800) transmits a signal to a clamp (220), and the clamp (220) lowers to support the seat (S) on the seat table (210). A control motor (140) moves a dancer roll (130) to adjust the tension of the seat (S) so that the seat (S) does not sag.

[0109] As shown in FIG. 6, the support member (200) moves to the cutting position. Since the sheet (S) is sandwiched between the sheet table (210) and the clamp (220), the sheet (S) moves together with the sheet table (210) and the clamp (220). The controller (800) transmits an unwinding signal to the unwinder (110) and the feeder (160) so that the sheet (S) can move. The support member (200) moves to the cutting position such that the reference plane (211) of the sheet table (210) comes into contact with the cutting line CL, and the movement distance D1 of the support member (200) may be the distance between the cutting line CL and the waiting line SL. Thus, the end of the sheet (S) can be positioned on the reference plane (211). In this way, the sheet table (210) provides a physical reference for the initial supply position and the cutting position of the sheet (S), thereby allowing the cutting length of the sheet (S) to be managed uniformly.

[0110] Next, the unit cell (C) is positioned on the support member (200). The controller (800) transmits a transfer signal to the first chuck (400), and the first chuck (400) grasps the unit cell (C) placed on the cell table (500) (Fig. 7). Then, the clamp (220) rises briefly, and after the first chuck (400) is placed on the sheet (S) and the position of the unit cell (C) is determined, it lowers again to support the unit cell (C) on the sheet table (210) (Fig. 8). The end of the unit cell (C) may come into contact with the cutting line CL or may not go beyond the cutting line CL.

[0111] Next, a sheet (S) is wound onto the unit cell (C). A controller (800) transmits a movement signal to the first chuck (400), and the first chuck (400) grasps the unit cell (C) and the sheet (S) located beneath the unit cell (C) together. Then, the first chuck (400) moves a predetermined distance in the direction of travel of the sheet (S). The unit cell (C) and the sheet (S) are moved by the first chuck (400) to the winding line WL (Fig. 9). For example, the end of the unit cell (C) and the sheet (S) in the direction of travel of the sheet (S) may come into contact with the winding line WL. The travel distance D2 of the first chuck (400) may be the distance between the winding line WL and the cutting line CL. The travel distance D2 may be predetermined by considering the length at which the sheet (S) is wound onto the unit cell (C) and the position where the end of the cut sheet (S) is attached to the unit cell (C). The controller (800) transmits an unwinding signal to the unwinder (110) and the feeder (160), and as the unwinder (110) rotates, the sheet (S) is unwound and moved along the transfer roller (120) by the feeder (160). Then, the second chuck (600) receives the unit cell (C) and the sheet (S) from the first chuck (400) (Fig. 10). The second chuck (600) moves in a direction opposite to the direction of travel of the sheet (S) and rotates the unit cell (C) and the sheet (S) so that the sheet (S) is wound onto the outer surface of the unit cell (C) (Fig. 11). The second chuck (600) moves the unit cell (C) to near the cutting position (Fig. 12).

[0112] As shown in FIG. 13, the sheet (S) is cut. The controller (800) transmits a cutting signal to the cutting unit (300), and the cutting unit (300) moves to cut the sheet (S). The clamp (220) lowers to support the sheet (S) on the sheet table (210) until it is cut. While supported on the sheet table (210), the cutting unit (300) cuts the sheet (S) based on the cutting line CL. Thus, the cutting quality of the sheet (S) can be improved, and the position of the cut end of the sheet (S) can be consistently managed. Alternatively, another type of cutting unit (300) described above may be applied to the cutting step of the sheet (S).

[0113] Next, as shown in FIGS. 14 and 15, the cut end SE of the sheet (S) is cleaned. The controller (800) transmits a movement signal to the second chuck (600), and the second chuck (600) moves to the cleaning position. The controller (800) transmits a cleaning signal to the finishing unit (700), and the pressure roller (710) of the finishing unit (700) rolls over the sheet (S) wound on the unit cell (C) to tighten the sheet (S), and the brush (720) sweeps the sheet (S) to attach the end of the sheet (S) to the unit cell (C). If necessary, adhesive may be applied, tape may be attached, or a heat press may be used to attach the end of the sheet (S) to the unit cell (C). The finishing unit (700) may position the end of the sheet (S) on the side of the unit cell (C). As shown in FIG. 15, the end of the sheet (S) can be attached to either of the two sides (front and back sides in the direction of travel of the sheet (S)) rather than the upper or lower surface of the unit cell (C). Thus, the end of the sheet (S) can be positioned on a relatively wide side of the unit cell (C) to secure a large contact area. In addition, if the end of the sheet (S) is positioned on the upper or lower surface of the unit cell (C), the unit cell (C) may not be pressed uniformly or may be damaged due to variations in the thickness of the sheet (S) during the subsequent pressurization process, but this can prevent such problems.

[0114] As shown in FIG. 16, the support member (200) is moved to a standby position. The controller (800) transmits a movement signal to the support member (200), and the support member (200) moves to the standby position. The support member (200) can be moved so that the reference surface (211) of the sheet table (210) comes into contact with the standby line SL. The clamp (220) presses the sheet (S) after cutting against the sheet table (210), and the position of the end of the sheet (S) after cutting can be controlled so that it always comes into contact with the standby line SL. Additionally, the controller (800) transmits a transfer signal to the first chuck (400), and the first chuck (400) can transfer the unit cell (C) after winding is completed to the next process and then return to its original position.

[0115] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely illustrative. Those skilled in the art will fully understand that various modifications and equivalent alternative embodiments are possible from the embodiments. Accordingly, the true technical scope of protection of the present invention should be determined based on the appended claims. Explanation of the symbols

[0116] 10: Sheet winding device 100: Supply unit 200: Support 210: Sheet Table 211: Reference plane 220: Clamp 300: Cutting section 301: First cutting section 302: Second cutting section 310: Blade 311: 1st Blade 312: The Second Blade 400: 1st ship 500: Cell table 600: 2nd ship 700: Closing part 800: Controller C: Unit cell S: Seat SL: Waiting line CL: Cutting line WL: Winding line

Claims

Claim 1 A sheet winding device comprising: a supply unit for supplying a sheet; a sheet table that supports a sheet and a unit cell and includes a reference plane in front of it in the direction of sheet transport, and is movable between a waiting position and a cutting position; a cell table that is provided separately from the support unit and supports a unit cell; a cutting unit that is mounted on the sheet table and moves integrally with the sheet table; a first chuck and a second chuck that move the sheet and the unit cell; and a controller; wherein, at the waiting position, the end of the sheet coincides with the reference plane. Claim 2 A sheet winding device according to claim 1, wherein the controller moves the unit cell and the sheet in the sheet forward direction with the first chuck when the sheet table on which the unit cell and the sheet are placed reaches a cutting position, and the cutting part is capable of moving up and down along the reference plane at the cutting position and cuts the sheet based on a cutting line formed along the reference plane. Claim 3 A sheet winding device according to claim 2, wherein the cutting section comprises: a first cutting section including a first blade in contact with the reference surface; and a second cutting section including a second blade spaced apart from the reference surface; wherein the cutting line is spaced apart from the reference surface, and the first cutting section and the second cutting section move up and down in opposite directions to each other while cutting the sheet based on the cutting line. Claim 4 A sheet winding device according to claim 1, wherein the controller moves the sheet table on which the unit cell is placed from the waiting position to the cutting position, moves the unit cell from the cutting position to the winding position using the first chuck, the waiting position, the cutting position, and the winding position are positioned in order along the sheet travel direction, and the distance between the cutting position and the winding position corresponds to the length of the sheet wound on the unit cell. Claim 5 In paragraph 4, the above controller moves the unit cell and the sheet from the above winding position to the above cutting position using the above second chuck to wind the sheet onto the unit cell, and when the unit cell reaches the above cutting position, the sheet is cut by the above cutting part, a sheet winding device. Claim 6 A sheet winding device according to claim 4, wherein the distance between the cutting position and the winding position satisfies the following mathematical formula 1.[Mathematical Formula 1] (In Equation 1, x represents the bottom surface length of the unit cell, y represents the side height of the unit cell, and z represents the top surface length of the unit cell. Additionally, in Equation 1, a is a natural number greater than or equal to 2, and b satisfies a < b < a+1.) Claim 7 A sheet winding method comprising: a step of positioning a sheet on a support member in a waiting position; a step of moving the support member to a cutting position; a step of positioning a unit cell on the support member; a step of moving the unit cell and the sheet; a step of winding the sheet onto the unit cell; a step of cutting the sheet; a step of trimming the cut end of the sheet; and a step of moving the support member to a waiting position. Claim 8 A sheet winding method according to claim 7, wherein the step of positioning the sheet on a support member in a waiting position involves positioning the end of the sheet on the end of the sheet table of the support member, and the step of moving the support member to a cutting position involves positioning the end of the sheet on a reference plane of the sheet table in front of the sheet in the direction of sheet progression. Claim 9 A sheet winding method according to claim 8, wherein the step of moving the unit cell and the sheet moves the unit cell and the sheet from a cutting position to a winding position, the waiting position, the cutting position and the winding position are positioned in order along the sheet's direction of travel, and the distance between the cutting position and the winding position corresponds to the length of the sheet wound on the unit cell. Claim 10 A sheet winding method according to claim 9, wherein the step of winding a sheet onto the unit cell involves moving the unit cell and the sheet from the winding position to the cutting position to wind the sheet onto the unit cell, and the step of cutting the sheet involves cutting the sheet with a cutting part mounted on the reference plane when the unit cell reaches the cutting position. Claim 11 A sheet winding method according to claim 9, wherein the distance between the cutting position and the winding position satisfies the following mathematical formula 1. [Mathematical Formula 1] (In Equation 1, x represents the bottom surface length of the unit cell, y represents the side height of the unit cell, and z represents the top surface length of the unit cell. Additionally, in Equation 1, a is a natural number greater than or equal to 2, and b satisfies a < b < a+1.) Claim 12 In claim 10, the step of trimming the cut end of the sheet is a sheet winding method in which the cut end of the sheet is attached to one of the two sides of the unit cell.

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