Electrode Rolling Equipment

Abstract

The present invention relates to an electrode rolling device that applies pressure to an uncoated portion of an electrode.

Description

[Technical field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0126836 dated October 5, 2022, and all contents disclosed in the documents of that Korean patent application are incorporated herein by reference.

[0002] The present invention relates to an electrode rolling device, and more particularly to an electrode rolling device that applies pressure to an uncoated portion of an electrode. [Background technology]

[0003] Secondary batteries are not only used as energy sources for mobile devices, but recently they have also been realized as power sources for electric vehicles (EVs) and hybrid electric vehicles (HEVs), and their range of use is expanding to include auxiliary power sources for grid-connected vehicles.

[0004] The manufacturing process of such secondary batteries is roughly divided into three steps: electrode process, assembly process, and chemical formation process. The electrode process is further divided into active material mixing process, electrode coating process, rolling process, slit process, winding process, etc.

[0005] Among these, the rolling process is a process of compressing the electrode sheet to a desired thickness and density by passing it between two rolling rollers heated to a high temperature in order to reduce the thickness of the electrode sheet after the coating process of the electrode active material to increase the capacity density and to increase the adhesiveness and adhesion between the electrode current collector and the electrode active material contained in the electrode active material.

[0006] In such a rolling process, the thickness of the electrode sheet is determined by the rolling gap between two rolling rollers, and the rolling gap is calculated by operating a driving unit that controls the up and down positions of the rolling rollers to compress and roll the electrode to a desired thickness. In general, one of the two rolling rollers is fixed, and the position of the other rolling roller is adjusted by the driving unit to compress and roll the electrode based on the calculated rolling gap.

[0007] However, when the electrode sheet is rolled by a rolling roller, almost no pressure is applied to the plain areas where the electrode active material is not applied, compared to the maintained areas where the electrode active material is coated, and waving or wrinkles occur in the plain areas due to the difference in elongation rate between the maintained areas and the plain areas.

[0008] Such swells and wrinkles cause meandering of the material and serious dimensional defects during the winding process performed after the rolling process, which ultimately reduces the quality of the secondary battery electrode. Therefore, an additional step of rolling the uncoated portion is required after rolling the electrode sheet.

[0009] FIG. 1 is a cross-sectional view showing a conventional electrode rolling device for rolling an uncoated portion. The conventional electrode rolling device includes one rolling roll (10) and includes a center portion (11), a first end portion (12), and a second end portion (13). Here, in the electrode rolling device, the outer surface of the center portion (11) extends from the first end portion (12) to the second end portion (13), and a first outer diameter (r1) of the center portion (11) connected to the first end portion (12) is larger than a second outer diameter (r2) of the center portion (11) connected to the second end portion (13). The uncoated portion (22) of the electrode (20) includes an insulating coating portion (23) and a non-insulating coating portion (24), and the first end portion (12) is located adjacent to the boundary between the insulating coating portion (23) and the non-insulating coating portion (24) of the electrode (20) and applies pressure to the insulating coating portion (23) and the non-insulating coating portion (24). Since the first outer diameter (r1) is larger than the second outer diameter (r2), pressure is applied evenly even if there is a difference in thickness between the insulating coating portion (23) and the non-insulating coating portion (24), and the deviation in the elongation rate can be reduced.

[0010] However, the conventional electrode rolling device can roll the uncoated portion (22) of the electrode (20) only with the first end portion (12) having a larger outer diameter, and the second end portion (13) cannot be used to roll the uncoated portion (22). Therefore, when the rolling roll (10) must be replaced due to wear of the first end portion (12), the second end portion (13) must also be discarded. This causes an economic problem in that a lot of costs are incurred for rolling the uncoated portion (22), and efforts to improve this situation are needed. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Korean Patent Publication No. 2019-0059210 [Patent Document 2] Korean Patent Publication No. 2022-0067239 Summary of the Invention [Problem to be solved by the invention]

[0012] An object of the present invention is to provide an electrode rolling device in which both the first rolling roller and the second rolling roller can be used for rolling the uncoated portion. [Means for solving the problem]

[0013] In order to achieve the above objectives, The present invention provides an electrode rolling device that applies pressure to the uncoated portion of an electrode, the uncoated portion including a retaining portion coated with an electrode active material and an uncoated portion not coated with an electrode active material, the uncoated portion including an insulating coating portion and a non-insulating coating portion, The electrode rolling device includes a first rolling roller and a second rolling roller, The first rolling roller includes a first center portion in a longitudinal direction and a first end portion located at one end of the first center portion, The second rolling roller includes a second center portion in a longitudinal direction and a second end portion located at one end of the second center portion, the other end cross section of the first central portion and the other end cross section of the second central portion are in contact with each other, a 1-1 outer diameter of the first central portion connected to the first end portion is different from a 1-2 outer diameter of the first central portion contacting the other end cross section of the second central portion; a 2-1 outer diameter of the second central portion connected to the second end portion is different from a 2-2 outer diameter of the second central portion contacting the other end cross section of the first central portion; The 1-2 outer diameter and the 2-2 outer diameter are the same, An electrode rolling device is provided, wherein the first end or the second end is adjacent to the boundary between the insulating coating portion and the non-insulating coating portion.

[0014] In one embodiment of the present invention, the 1-1 outer diameter is smaller than the 1-2 outer diameter, and the 2-1 outer diameter is smaller than the 2-2 outer diameter; or The 1-1 outer diameter may be greater than the 1-2 outer diameter, and the 2-1 outer diameter may be greater than the 2-2 outer diameter.

[0015] In one embodiment of the present invention, the length of the first core portion and the length of the second core portion may be the same or different from each other.

[0016] In one embodiment of the present invention, the first and second central portions may have the same length and the 1-1 and 2-1 outer diameters may be the same.

[0017] In one embodiment of the present invention, the first and second central portions may have different lengths, and the 1-1 and 2-1 outer diameters may be the same or different.

[0018] In one embodiment of the present invention, a length ratio between the first and second central portions may be 3:5 to 5:3.

[0019] In one embodiment of the present invention, the 1-2 outer diameter may be 0.8 to 0.99 times or 1.01 to 1.2 times the 1-1 outer diameter, and the 2-2 outer diameter may be 0.8 to 0.99 times or 1.01 to 1.2 times the 2-1 outer diameter.

[0020] In one embodiment of the present invention, the first end may be tapered such that an outer diameter gradually decreases from a first center portion to a rear end portion, and the second end may be tapered such that an outer diameter gradually decreases from a second center portion to a rear end portion.

[0021] In one embodiment of the present invention, the tapered surfaces of the first end and the second end may include a curved tapered surface and a linear tapered surface extending from the curved tapered surface.

[0022] In one embodiment of the present invention, the taper angles of the first end and the second end may be the same or different from each other.

[0023] In one embodiment of the present invention, the taper angle of the first end and the second end may be 20 to 30 degrees.

[0024] In one embodiment of the present invention, the first rolling roller and the second rolling roller may be made of the same or different materials, and the materials may be metal or polymer.

[0025] In an embodiment of the present invention, the insulating coating portion may include at least one material selected from the group consisting of an insulating polymer material and an insulating ceramic material.

[0026] In one embodiment of the present invention, the material of the first rolling roller or the second rolling roller is metal, and the insulating coating portion may include an insulating polymer material.

[0027] In one embodiment of the present invention, the first rolling roller or the second rolling roller is made of a polymer, and the insulating coating portion may include an insulating ceramic material.

[0028] In one embodiment of the present invention, at least one of the first central portion, the first end portion, the second central portion, and the second end portion may have an outer peripheral surface with alternating grooves and protrusions for forming a plurality of wrinkles in the plain portion in parallel from the maintaining portion to a rear end of the plain portion.

[0029] In one embodiment of the present invention, the grooves and protrusions may have a cross-sectional shape similar to a triangle or a semicircle. Effect of the Invention

[0030] In the electrode rolling device of the present invention, not only the first rolling roller but also the second rolling roller can be used to roll the uncoated part of the electrode. Specifically, even if the first rolling roller wears out due to continuous rolling of the uncoated part, the uncoated part can be rolled using the second rolling roller, so there is no waste and it is economically effective.

[0031] In addition, the material of the first rolling roller and the second rolling roller, the ratio of the 1-2 outer diameter to the 1-1 outer diameter, the ratio of the 2-2 outer diameter to the 2-1 outer diameter, or the length ratio of the first center portion and the second center portion can be easily changed depending on the material of the insulating coating portion, the width direction length of the uncoated portion, etc., and electrodes of various shapes can be manufactured. [Brief description of the drawings]

[0032] [Figure 1] FIG. 1 is a cross-sectional view showing a conventional electrode rolling device. [Diagram 2] FIG. [Diagram 3] 1 is a cross-sectional view showing an electrode rolling device used in an uncoated portion of an electrode according to an embodiment of the present invention. [Figure 4] 1 is a cross-sectional view showing an electrode rolling device used in an uncoated portion of an electrode according to an embodiment of the present invention. [Diagram 5] 1 is a cross-sectional view showing an electrode rolling device used in an uncoated portion of an electrode according to an embodiment of the present invention. [Figure 6] 1 is a cross-sectional view showing an electrode rolling device used in an uncoated portion of an electrode according to an embodiment of the present invention. [Figure 7] 1 is a photograph of an electrode in which a non-coated portion is rolled using an electrode rolling apparatus according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, in order to enable those skilled in the art to easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments set forth herein.

[0034] In order to clearly describe the present invention, parts that are not relevant to the description will be omitted, and the same reference numerals will be used to refer to the same or similar components throughout the specification.

[0035] Furthermore, the terms and words used in this specification and the claims should not be interpreted in a limited manner to their ordinary or dictionary meaning, but should be interpreted in a meaning and concept that corresponds to the technical idea of ​​the present invention, based on the principle that an inventor can appropriately define the concept of a term in order to best describe his or her invention.

[0036] FIG. 2 is a side cross-sectional view of an electrode (20) that is rolled by the electrode rolling apparatus (100) of the present invention.

[0037] Referring to FIG. 2, the electrode (20) includes a supporting portion (21) in which an electrode active material is applied to each surface of a rectangular plate-shaped current collector. A portion where the electrode active material is not applied is a non-coated portion (22), and the non-coated portion (22) may be a current collector. An insulating coating portion (23) is included at the boundary between the non-coated portion (22) and the supporting portion (21). Specifically, the insulating coating portion (23) may be located such that its upper or lower surface is in contact with the non-coated portion (22) and its side surface is in contact with the supporting portion (21). A portion of the non-coated portion (22) where the insulating coating portion (23) is not formed is a non-insulating coating portion (24), and the non-coated portion (22) may include the insulating coating portion (23) and the non-insulating coating portion (24). Thus, the non-insulating coating portion (24) may be a current collector.

[0038] Furthermore, as shown in FIG. 2, in this embodiment, the height of the insulating coating portion (23) when adhered to the surface of the retaining portion (21) can be configured to be the same as the height of the retaining portion (21) or slightly lower.

[0039] The present invention relates to an electrode rolling device that applies pressure to an uncoated portion (22) of an electrode (20), the uncoated portion (22) including an insulating coating portion (23) and a non-insulating coating portion (24), the electrode (20) including a retaining portion (21) coated with an electrode active material and an uncoated portion (22) not coated with an electrode active material, the uncoated portion (22) including an insulating coating portion (23) and a non-insulating coating portion (24), The electrode rolling device (100) includes a first rolling roller (110) and a second rolling roller (120). The first rolling roller (110) includes a first center portion (111) in a longitudinal direction and a first end portion (112) located at one end of the first center portion, The second rolling roller (120) includes a second center portion (121) in a longitudinal direction and a second end portion (122) located at one end of the second center portion, the other end cross section of the first central portion (111) and the other end cross section of the second central portion (121) are in contact with each other, a 1-1 outer diameter (r1-1) of the first center portion (111) connected to the first end portion (112) is different from a 1-2 outer diameter (r1-2) of the first center portion (111) contacting the other end cross section of the second center portion (121); a 2-1 outer diameter (r2-1) of the second central portion (121) connected to the second end portion (122) is different from a 2-2 outer diameter (r2-2) of the second central portion (121) contacting the other end cross section of the first central portion (111); The 1-2 outer diameter (r1-2) and the 2-2 outer diameter (r2-2) are the same, The first end (112) or the second end (122) is related to the electrode rolling device (100) adjacent to the boundary between the insulating coating portion (23) and the non-insulating coating portion (24).

[0040] The first rolling roller (110) may include a first center portion (111) and a first end portion (112) located at one end of the first center portion (111), and the first center portion (111) and the first end portion (112) may be integrated. That is, the first end portion (112) may be extended from one end of the first center portion (111). As an example, the first rolling roller (110) may have the first end portion (112) processed through an additional process based on the first center portion (111). Alternatively, the first center portion (111) and the first end portion (112) may be manufactured separately, and the first center portion (111) and the first end portion (112) may be joined to each other through an additional process, but the first rolling roller (110) may be manufactured in various ways without being limited thereto.

[0041] The second rolling roller (120) may include a second center portion (121) and a second end portion (122) located at one end of the second center portion (121), and the second center portion (121) and the second end portion (122) may be integrated. That is, the second end portion (122) may be extended from one end of the second center portion (121). As an example, the second rolling roller (120) may have the second end portion (122) processed through an additional process based on the second center portion (121). Alternatively, the second center portion (121) and the second end portion (122) may be manufactured separately, and the second center portion (121) and the second end portion (122) may be joined to each other through an additional process, but the second rolling roller (120) may be manufactured in various ways without being limited thereto.

[0042] In addition, the other end cross section of the first central portion (111) and the other end cross section of the second central portion (121) may be in contact with each other. Therefore, the first rolling roller (110) and the second rolling roller (120) may be integrated, and the 1-2 outer diameter (r1-2) of the first central portion and the 2-2 outer diameter (r2-2) of the second central portion may be the same.

[0043] The electrode rolling device (100) of the present invention has a very economical effect since both the first rolling roller (110) and the second rolling roller (120) can be used to roll the uncoated portion (22) of the electrode (20). In the present invention, the fact that the first rolling roller (110) and the second rolling roller (120) can roll the uncoated portion (22) of the electrode (20) does not mean that the first rolling roller (110) and the second rolling roller (120) roll the uncoated portion (22) of the electrode (20) at the same time, but means that the first rolling roller (110) and the second rolling roller (120) each roll the uncoated portion (22) of the electrode (20). More specifically, the first rolling roller (110) is preferentially used to roll the uncoated portion (22) of the electrode (20), and when the first rolling roller (110) cannot be used due to wear, etc., the second rolling roller (120) can be used to roll the uncoated portion (22) of the electrode (20). Alternatively, the first rolling roller (110) and the second rolling roller (120) can be manufactured to have different shapes and materials, etc., and the uncoated portion (22) can be rolled at the same level as the maintenance portion (21) by selecting the first rolling roller (110) or the second rolling roller (120) that is suitable for the shape and material, etc., of the electrode (20).

[0044] The outer surface of the first core (111) may extend from the first end (112) to the second core (121), and the outer surface of the second core (121) may extend from the second end (122) to the first core (111).

[0045] The 1-1 outer diameter (r1-1) may be smaller than the 1-2 outer diameter (r1-2), and the 2-1 outer diameter (r2-1) may be smaller than the 2-2 outer diameter (r2-2). Alternatively, the 1-1 outer diameter (r1-1) may be larger than the 1-2 outer diameter (r1-2), and the 2-1 outer diameter (r2-1) may be larger than the 2-2 outer diameter (r2-2).

[0046] In addition, the 1-2 outer diameter (r1-2) may be 0.8 to 0.99 times or 1.01 to 1.2 times the 1-1 outer diameter (r1-1), and the 2-2 outer diameter (r2-2) may be 0.8 to 0.99 times or 1.01 to 1.2 times the 2-1 outer diameter (r2-1).

[0047] The length of the first core (L1) and the length of the second core (L2) may be the same or different from each other. Preferably, the ratio of the length of the first core (L1) and the length of the second core (L2) may be 3:5 to 5:3, preferably 3:4 to 4:3.

[0048] The first and second central portions may have the same length (L1) and length (L2), in which case the first-1 outer diameter (r1-1) and second-1 outer diameter (r2-1) may be the same or different from each other.

[0049] The length of the first central portion (L1) and the length of the second central portion (L2) may be different from each other, in which case the 1-1 outer diameter (r1-1) and the 2-1 outer diameter (r2-1) may be the same or different from each other.

[0050] The first end (112) may have a tapered shape in which the outer diameter gradually decreases from the first center (111) toward the rear end, and the second end (122) may have a tapered shape in which the outer diameter gradually decreases from the second center (121) toward the rear end.

[0051] In addition, the tapered surfaces of the first end (112) and the second end (122) may include a curved tapered surface (R) and a linear tapered surface (L) extending from the curved tapered surface (R). If the tapered surface were formed only with the linear tapered surface (L), breakage may occur when rolling the uncoated portion (22) of the electrode (20). Therefore, by forming a curved tapered surface (R) by curving the tapered surface, the uncoated portion (22) can be rolled without damaging the electrode (20).

[0052] Thus, the first end (112) and the second end (122) may have a taper angle, and the taper angle of the first end (112) and the taper angle of the second end (122) may be the same or different from each other. In one embodiment, the taper angle of the first end (112) and the taper angle of the second end (122) may be 20 to 30 degrees.

[0053] Since the electrode rolling device (100) according to the present invention can roll the uncoated portion (22) of the electrode (20) with the first rolling roller (110) or the second rolling roller (120), the first end (112) or the second end (122) can be adjacent to the boundary between the maintaining portion (21) and the uncoated portion (22), and preferably, can be adjacent to the boundary between the insulating coating portion (23) and the non-insulating coating portion (24). 3 and 4 illustrate an electrode rolling apparatus 100 according to one embodiment of the present invention.

[0054] 3, the 1-1 outer diameter (r1-1) may be smaller than the 1-2 outer diameter (r1-2), and the 2-1 outer diameter (r2-1) may be smaller than the 2-2 outer diameter (r2-2). In addition, the length (L1) of the first central portion may be the same as the length (L2) of the second central portion, and the 1-1 outer diameter (r1-1) and the 2-1 outer diameter (r2-1) may be the same as each other.

[0055] 4, the 1-1 outer diameter (r1-1) may be larger than the 1-2 outer diameter (r1-2), and the 2-1 outer diameter (r2-1) may be larger than the 2-2 outer diameter (r2-2). In addition, the length (L1) of the first central portion may be the same as the length (L2) of the second central portion, and the 1-1 outer diameter (r1-1) and the 2-1 outer diameter (r2-1) may be the same as each other.

[0056] That is, the electrode rolling device (100) shown in FIG. 3 and FIG. 4 may have a symmetrical first rolling roller (110) and second rolling roller (120).

[0057] The supporting portion 21 of the electrode 20 may have the same or different widths of the electrode active material coated on the top and bottom surfaces, and the widths of the top and bottom surfaces of the non-coating portion 22 formed thereby may be the same or different.

[0058] The electrode rolling apparatus (100) shown in Figs. 3 and 4 according to an embodiment of the present invention has a symmetrical first rolling roller (110) and a symmetrical second rolling roller (120), and therefore can be used to roll an electrode in which the width of the upper and lower surfaces of the uncoated portion (22) is the same. That is, the electrode rolling apparatus (100) shown in Figs. 3 and 4 can be used to roll the uncoated portion (22) of the electrode (20) with both the first rolling roller (110) and the second rolling roller (120), and even if the first rolling roller (110) is worn, the uncoated portion (22) can be rolled using the second rolling roller (120). Also, the electrode rolling apparatus (100) shown in Figs. 3 and 4 can have the same level of rolling effect on the uncoated portion (22).

[0059] Although FIGS. 3 and 4 show that the first end (112) and the second end (122) are located at the boundary between the insulating coating portion (23) and the non-insulating coating portion (24) of the electrode (20), this does not mean that the first rolling roller (110) and the second rolling roller (120) simultaneously roll the uncoated portion (22) of the electrode (20), but rather that the first rolling roller (110) and the second rolling roller (120) each roll the uncoated portion (22) of the electrode (20).

[0060] 5 and 6 illustrate an electrode rolling apparatus 100 according to one embodiment of the present invention.

[0061] 5, the 1-1 outer diameter (r1-1) may be smaller than the 1-2 outer diameter (r1-2), and the 2-1 outer diameter (r2-1) may be smaller than the 2-2 outer diameter (r2-2). Also, the length (L1) of the first central portion may be different from the length (L2) of the second central portion, and the 1-1 outer diameter (r1-1) and the 2-1 outer diameter (r2-1) may be the same.

[0062] 6, the 1-1 outer diameter (r1-1) may be larger than the 1-2 outer diameter (r1-2), and the 2-1 outer diameter (r2-1) may be larger than the 2-2 outer diameter (r2-2). Also, the length (L1) of the first central portion may be different from the length (L2) of the second central portion, and the 1-1 outer diameter (r1-1) and the 2-1 outer diameter (r2-1) may be the same.

[0063] That is, the electrode rolling device (100) shown in FIG. 5 and FIG. 6 may have an asymmetrical first rolling roller (110) and a second rolling roller (120).

[0064] The electrode rolling apparatus (100) shown in Figures 5 and 6 according to an embodiment of the present invention has an asymmetrical first rolling roller (110) and a second rolling roller (120), and therefore can be preferably used to roll electrodes having different widths on the upper and lower surfaces of the uncoated portion (22). That is, the electrode rolling apparatus (100) shown in Figures 5 and 6 can be used to roll the uncoated portion (22) of the electrode (20) with both the first rolling roller (110) and the second rolling roller (120).

[0065] 5 and 6 show that the length (L1) of the first central portion is shorter than the length (L2) of the second central portion. Also, the electrode (20) shows that the top surface (tab) of the uncoated portion (22) is narrower than the bottom surface (bottom). Therefore, the top surface (tab) of the narrow uncoated portion (22) can be positioned on the first rolling roller (110), and the bottom surface (bottom) of the wide uncoated portion (22) can be positioned on the second rolling roller (120).

[0066] That is, the electrode rolling apparatus (100) according to one embodiment of the present invention is capable of selecting a rolling roller that can roll the electrode (20) depending on the shape of the electrode (20), and therefore both the first rolling roller (110) and the second rolling roller (120) can be used to roll the electrode (20).

[0067] Although FIGS. 5 and 6 show that the first end (112) and the second end (122) are located at the boundary between the insulating coating portion (23) and the non-insulating coating portion (24) of the electrode (20), this does not mean that the first rolling roller (110) and the second rolling roller (120) simultaneously roll the uncoated portion (22) of the electrode (20), but rather that the first rolling roller (110) and the second rolling roller (120) each roll the uncoated portion (22) of the electrode (20).

[0068] The insulating coating portion (23) may include one or more selected from the group consisting of insulating polymer materials and insulating ceramic materials. The insulating polymer material is not particularly limited as long as it is used in the industry, but may preferably include one or more selected from the group consisting of polyvinylidene fluoride, polyimide, polyethylene terephthalate, polyurethane, polyacrylate, epoxy, and silicone. The insulating ceramic material is not particularly limited as long as it is used in the industry, but may include a mixture of an insulating polymer and one or more selected from the group consisting of aluminum oxide, silicon oxide, silicon nitride, iron oxide, and glass.

[0069] The first rolling roller (110) and the second rolling roller (120) may be made of the same or different materials, and the materials may be metal or polymer. The metal may include one or more oxides selected from the group consisting of aluminum, tin, and zinc, and may preferably include aluminum. The polymer may include one or more selected from the group consisting of polyether ether ketone, polyolefin resin, polyethylene terephthalate, polybutylene terephthalate, polyacetal, polyamide, polycarbonate, polyimide, polyether sulfone, polyphenylene oxide, polyphenylene sulfide, and polyethylene naphthalene, and may preferably include polyether ether ketone.

[0070] When the first rolling roller 110 and the second rolling roller 120 are made of the same material, the first rolling roller 110 and the second rolling roller 120 may be integrated together.

[0071] The material of the first rolling roller (110) and the second rolling roller (120) can be determined according to the type of material forming the insulating coating portion (23). In one embodiment, when the material forming the insulating coating portion (23) is an insulating ceramic material, the material of the first rolling roller (110) or the second rolling roller (120) rolling the plain portion (22) of the electrode (20) can be a polymer. If the material is a metal, both the ceramic and the metal have high strength, and the first end (112) or the second end (122) of the metal material in contact with the ceramic can wear out quickly. In another embodiment, when the material forming the insulating coating portion (23) is an insulating polymer material, the material of the first rolling roller (110) or the second rolling roller (120) rolling the plain portion (22) of the electrode (20) can be a metal. If the material is a polymer, both the insulating polymer material and the polymer have low strength, and the rolling of the plain portion (22) may not be performed properly.

[0072] In addition, the electrode rolling device (100) may alternately form grooves and protrusions on the outer circumferential surface of at least one of the first center (111), the first end (112), the second center (121), and the second end (122) to form a number of parallel wrinkles in the non-coated portion (22) from the maintaining portion (21) to the rear end of the non-coated portion (22). The grooves and protrusions may have a cross section similar to a triangle or a semicircle.

[0073] The electrode rolling device (100) of the present invention can roll the uncoated portion (22) of the electrode (20) not only with the first rolling roller (110) but also with the second rolling roller (120). Therefore, it can have an economic effect. Furthermore, even if the shape and material of the electrode (20) are different, such as the width direction length of the uncoated portion (22) and the type of material forming the insulating coating portion (23), the material of the first rolling roller (110) and the second rolling roller (120), the ratio of the 1-2 outer diameter (r1-2) to the 1-1 outer diameter (r1-1), the ratio of the 2-2 outer diameter (r2-2) to the 2-1 outer diameter (r2-1), or the ratio of the lengths of the first central portion and the second central portion (L1 / L2), etc., can be changed to realize the rolling effect of the uncoated portion (22) at the same level as that of the maintenance portion (21).

[0074] In addition, the first rolling roller (110) and the second rolling roller (120) of the present invention may integrally form one press roll, and the press roll may include a press roll fixing part (not shown) that rotatably fixes the press roll.

[0075] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also belong to the scope of the present invention. [Explanation of symbols]

[0076] 10: Rolling roll 11: Center part 20: Electrode 21: Maintenance part 22: Plain part 23: Insulating coating part 24: Non-insulating coating section 100: Electrode rolling device 110: First rolling roller 111: First center 12, 112: First end 120: Second rolling roller 121: Second center 13, 122: Second end r1: 1st outer diameter r2: 2nd outer diameter r1-1: No. 1-1 outer diameter r1-2: No. 1-2 outer diameter r2-1: No. 2-1 outside diameter r2-2: No. 2-2 outside diameter L1: Length of the first center L2: Length of the second center

Claims

1. an electrode rolling device that applies pressure to the uncoated portion of an electrode, the uncoated portion including a support portion coated with an electrode active material and an uncoated portion not coated with an electrode active material, the uncoated portion including an insulating coating portion and a non-insulating coating portion; The electrode rolling device includes a first rolling roller and a second rolling roller, The first rolling roller includes a first center portion in a longitudinal direction and a first end portion located at one end of the first center portion, The second rolling roller includes a second center portion in a length direction and a second end portion located at one end of the second center portion, the other end cross section of the first central portion and the other end cross section of the second central portion are in contact with each other, a 1-1 outer diameter of the first central portion connected to the first end portion is different from a 1-2 outer diameter of the first central portion contacting the other end cross section of the second central portion; a 2-1 outer diameter of the second central portion connected to the second end portion is different from a 2-2 outer diameter of the second central portion contacting the other end cross section of the first central portion; The first-2 outer diameter and the second-2 outer diameter are the same, An electrode rolling apparatus, wherein the first end or the second end is adjacent to a boundary between the insulating coating portion and the non-insulating coating portion.

2. The 1-1 outer diameter is smaller than the 1-2 outer diameter, and the 2-1 outer diameter is smaller than the 2-2 outer diameter, or 2. The electrode rolling apparatus according to claim 1, wherein the first-1 outer diameter is larger than the first-2 outer diameter, and the second-1 outer diameter is larger than the second-2 outer diameter.

3. 3. The electrode rolling apparatus of claim 2, wherein a length of the first central portion and a length of the second central portion are the same or different from each other.

4. the length of the first central portion and the length of the second central portion are equal; 4. The electrode rolling apparatus according to claim 3, wherein the first-1 outer diameter and the second-1 outer diameter are the same as or different from each other.

5. the first central portion and the second central portion have different lengths, 4. The electrode rolling apparatus according to claim 3, wherein the first-1 outer diameter and the second-1 outer diameter are the same as or different from each other.

6. 4. The electrode rolling apparatus according to claim 3, wherein a length ratio of the first center portion to the second center portion is from 3:5 to 5:

3.

7. The 1-2 outer diameter is 0.8 to 0.99 times or 1.01 to 1.2 times the 1-1 outer diameter, 2. The electrode rolling apparatus according to claim 1, wherein the 2-2 outer diameter is 0.8 to 0.99 times or 1.01 to 1.2 times the 2-1 outer diameter.

8. the first end portion has a tapered shape in which an outer diameter gradually decreases from the first center portion toward the rear end portion, The electrode rolling device according to claim 1 , wherein the second end portion has a tapered shape in which an outer diameter gradually decreases from the second center portion toward the rear end portion.

9. The electrode rolling apparatus of claim 8 , wherein the tapered surfaces of the first end and the second end include a curved tapered surface and a linear tapered surface extending from the curved tapered surface.

10. The electrode rolling apparatus of claim 8 , wherein the taper angles of the first end and the second end are the same or different from each other.

11. The electrode rolling apparatus according to claim 10, wherein the taper angle of the first end and the second end is 20 to 30 degrees.

12. The materials of the first rolling roller and the second rolling roller are the same or different from each other, 2. The electrode rolling apparatus according to claim 1, wherein the material is a metal or a polymer.

13. The electrode rolling apparatus according to claim 1 , wherein the insulating coating portion includes at least one material selected from the group consisting of an insulating polymer material and an insulating ceramic material.

14. The first rolling roller or the second rolling roller is made of a metal, The electrode rolling apparatus of claim 1 , wherein the insulating coating comprises an insulating polymer material.

15. The material of the first rolling roller or the second rolling roller is a polymer, The electrode rolling apparatus of claim 1 , wherein the insulating coating comprises an insulating ceramic material.

16. 16. The electrode rolling device according to claim 1, wherein an outer circumferential surface of at least one of the first center portion, the first end portion, the second center portion, and the second end portion is alternately formed with grooves and protrusions for forming a plurality of wrinkles in parallel in the uncoated portion from the maintaining portion to a rear end direction of the uncoated portion.

17. 17. The electrode rolling apparatus according to claim 16, wherein the grooves and protrusions have a cross-sectional shape similar to a triangle or a semicircle.

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