Electrode forming device and electrode manufactured using same

Abstract

The present invention relates to an electrode forming device and an electrode manufactured using same. The electrode forming device can form a pattern on an electrode so as to prevent a problem of lithium deposition due to improper lithium intercalation and deintercalation in the electrode during rapid charging, can be effectively applied in relation to a point that pattern forming conditions may vary depending on the length and position of the electrode, and can prevent damage that may occur when a forming protrusion comes into contact with an uncoated portion of the electrode.

Description

Electrode forming device and electrode manufactured using the same

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0182570 filed December 10, 2024 and Korean Patent Application No. 10-2025-0179458 filed November 24, 2025, and all contents disclosed in the documents of said Korean patent applications are incorporated herein as part of this specification.

[0003] Technology field

[0004] The present invention relates to an electrode forming apparatus and an electrode manufactured using the same. The apparatus can form a pattern on the electrode to prevent the problem of lithium precipitation caused by the failure of lithium insertion and extraction from the electrode during rapid charging, and can be effectively applied in relation to the fact that pattern forming conditions may vary depending on the length and position of the electrode. Furthermore, the invention relates to an electrode forming apparatus and an electrode manufactured using the same that can prevent damage that may occur when a forming protrusion comes into contact with the electrode's uncoated portion.

[0005] Secondary batteries are classified according to the shape of the battery case into cylindrical and prismatic batteries, in which the electrode assembly is embedded in a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is embedded in a pouch-type case made of aluminum laminate sheets.

[0006] In addition, the electrode assembly embedded in the battery case is a power generation element capable of charging and discharging, comprising a stacked structure of a positive electrode, a separator, and a negative electrode, and can be classified into a jellyroll-type structure in which a separator is interposed between long sheet-type positive and negative electrodes coated with an active material and wound, a stack-type structure in which a plurality of positive and negative electrodes of a predetermined size are sequentially stacked with a separator interposed, and a stack / folding-type electrode assembly in which bicells or full cells are wound by stacking positive and negative electrodes of a predetermined unit with a separator interposed.

[0007] Among them, jelly-roll type electrode assemblies are widely produced due to their advantages of ease of manufacturing and high energy density per unit weight. A jelly-roll type electrode assembly could be manufactured by assembling a laminate comprising long sheet-type positive and negative electrodes with a separator interposed between them, and then winding the sheet along its length while a winding core is in contact with one end of the electrode laminate. Furthermore, this jelly-roll type electrode assembly can be inserted into a battery case made of a cylindrical metal can to form a cylindrical secondary battery.

[0008] Conventionally, in cylindrical secondary batteries, the presence of an outer rigid battery case (typically made of a can) caused stress due to the expansion of the jellyroll-type electrode assembly during charging. This stress resulted in a shortage of electrolyte in the affected areas, which led to an increase in resistance and consequently caused lithium (Li) precipitation. Particularly during rapid charging, the insertion and extraction of lithium did not occur smoothly, leading to uneven reactions on the surface and resulting in lithium precipitation problems.

[0009] When lithium precipitation occurs, the electrode thickness increases, leading to further compressive stress. This strongly compresses the porous separator, causing the lithium precipitation area to gradually expand. In this case, abnormal heat generation behavior may be exhibited, and the risk of ignition increases significantly. The pores of the separator become clogged due to compressive stress, and a rapid increase in resistance and heat generation occur due to the influence of the electrode byproduct layer. These continuous side reactions and lithium precipitation cause the jelly-roll type electrode assembly to expand, which was the cause of battery case rupture and even explosion. Therefore, research was required to solve these problems.

[0010] Accordingly, as part of a solution to this problem, a method has been researched and developed to form an indented groove-shaped pattern in the electrode retaining portion (the part of the current collector coated with the electrode active material). For example, a forming roll with protrusions formed on a roll-shaped mold can be used. By rolling the electrode retaining portion while applying pressure with such a forming roll, multiple groove-shaped patterns can be formed on the electrode.

[0011] However, since pattern forming conditions can vary depending on the length and position of the electrode, there was a problem in that effective forming could not be achieved in a single pass when using a forming roll with uniformly formed protrusions. Additionally, the electrode may have alternating retaining and uncoated sections (parts not coated with electrode active material); using conventional forming rolls in this case also presented a problem where the protrusions would come into contact with and damage the uncoated sections. Consequently, there was the inconvenience of having to change the position of the roll or the electrode in the uncoated sections to avoid damage caused by the protrusions touching the uncoated areas.

[0012] The present invention has been devised to solve the above-mentioned problems. The objective of the present invention is to provide an electrode forming device and an electrode manufactured using the same, which can form a pattern on an electrode to prevent the problem of lithium precipitation caused by the failure of lithium insertion and extraction from the electrode during rapid charging, effectively apply the condition that the pattern forming conditions may vary depending on the length and position of the electrode, and prevent damage that may occur when a forming protrusion comes into contact with the electrode's uncoated portion.

[0013] The electrode forming apparatus according to the present invention relates to an electrode forming apparatus for forming an electrode comprising a retaining portion coated with an electrode active material and a non-retaining portion not coated with an electrode active material, wherein the apparatus comprises a roller unit having the shape of a roller for forming the retaining portion, and the roller unit comprises: a cylindrical body portion; a protrusion forming region formed with a protrusion forming the retaining portion on the outer surface of the body portion; and a protrusion non-forming region on the outer surface of the body portion where no protrusion is formed, wherein the protrusion forming region and the protrusion non-forming region are provided in a plurality of numbers, and the protrusion forming region and the protrusion non-forming region are alternately positioned along the circumferential direction (C) of the body portion.

[0014] The roller unit includes a first protrusion forming area in which a first protrusion is formed; a second protrusion forming area in which a second protrusion is formed and which is positioned at a predetermined distance in the circumferential direction of the body portion from the first protrusion forming area; and a first protrusion non-forming area located between the first protrusion forming area and the second protrusion forming area, wherein the size of the second protrusion formed in the second protrusion forming area may be different from the size of the first protrusion formed in the first protrusion forming area.

[0015] The size of the second protrusion formed in the second protrusion forming region may be smaller than the size of the first protrusion formed in the first protrusion forming region.

[0016] The height of the first protrusion formed in the first protrusion forming area may be formed higher than the height of the second protrusion formed in the second protrusion forming area, or the spacing between the first protrusions formed in the first protrusion forming area may be formed with a smaller spacing than the spacing between the second protrusions formed in the second protrusion forming area.

[0017] The height of the first protrusion formed in the first protrusion forming area is formed to be higher than the height of the second protrusion formed in the second protrusion forming area, and the spacing between the first protrusions formed in the first protrusion forming area can be formed to be smaller than the spacing between the second protrusions formed in the second protrusion forming area.

[0018] A plurality of first protrusions are formed in the first protrusion forming region, and a plurality of second protrusions are formed in the second protrusion forming region. The first protrusions formed in the first protrusion forming region have a height (h1) of 10 to 100 µm and a diameter (D1) of 5 to 100 µm, and the spacing (d1) between the first protrusions is 30 µm to 200 µm. The second protrusions formed in the second protrusion forming region also have a height (h2) of 10 to 100 µm and a diameter (D2) of 5 to 100 µm, and the spacing (d2) between the second protrusions is 30 µm to 200 µm.

[0019] A plurality of first protrusions are formed in the first protrusion forming region, and a plurality of second protrusions are formed in the second protrusion forming region, and the first protrusions formed in the first protrusion forming region may have the same size as each other, and the second protrusions formed in the second protrusion forming region may have the same size as each other.

[0020] The roller unit further includes a third protrusion forming area where a third protrusion is formed and is positioned at a predetermined distance in the circumferential direction of the body portion in the second protrusion forming area; and a second protrusion non-forming area located between the second protrusion forming area and the third protrusion forming area, wherein the size of the third protrusion formed in the third protrusion forming area may differ from the size of the second protrusion formed in the second protrusion forming area.

[0021] The size of the third protrusion formed in the third protrusion forming region may be smaller than the size of the second protrusion formed in the second protrusion forming region.

[0022] The height of the second protrusion formed in the second protrusion forming area may be formed higher than the height of the third protrusion formed in the third protrusion forming area, or the spacing between the second protrusions formed in the second protrusion forming area may be formed with a smaller spacing than the spacing between the third protrusions formed in the third protrusion forming area.

[0023] The height of the second protrusion formed in the second protrusion forming area is formed to be higher than the height of the third protrusion formed in the third protrusion forming area, and the spacing between the second protrusions formed in the second protrusion forming area can be formed to be smaller than the spacing between the third protrusions formed in the third protrusion forming area.

[0024] A plurality of third protrusions are formed in the third protrusion forming region, and the third protrusions formed in the third protrusion forming region may have a height (h3) of 10 to 100 µm, a diameter (D3) of 5 to 100 µm, and a spacing (d3) between the third protrusions of 30 µm to 200 µm.

[0025] The third protrusions formed in the third protrusion formation area may be the same size as each other.

[0026] The protrusion forming regions can be formed only for the 10% to 90% section (L1) of the total length (L) from the first retaining portion to the last retaining portion formed on the electrode.

[0027] The protrusion-forming regions are located on the retaining portion to form the retaining portion, and with respect to the circumferential direction (C) of the body portion, the length (M) from the end point of the last protrusion-forming region to the start point of the first protrusion-forming region may be 100% to 110% of the length (N) of the thumb portion.

[0028] An electrode manufactured by an electrode forming device according to the present invention comprises a retaining portion coated with an electrode active material on a current collector; and a non-retaining portion not coated with an electrode active material on a current collector, wherein the retaining portion includes a pattern forming area in which a pattern in the shape of an indented groove is formed and a pattern non-forming area in which no pattern is formed, and the pattern forming area and the pattern non-forming area are provided in a plurality of such portions, and the pattern forming area and the pattern non-forming area are alternately located along the longitudinal direction (F) of the current collector on the retaining portion.

[0029] The retaining portion includes a first pattern forming area where a first pattern is formed; a second pattern forming area where a second pattern is formed and is positioned at a predetermined interval in the longitudinal direction (F) of the current collector from the first pattern forming area; and a first pattern non-forming area located between the first pattern forming area and the second pattern forming area, wherein the size of the second pattern formed in the second pattern forming area may differ from the size of the second pattern formed in the first pattern forming area.

[0030] The size of the second pattern formed in the second pattern forming area may be smaller than the size of the first pattern formed in the first pattern forming area.

[0031] The depth of the first pattern formed in the first pattern forming area may be formed deeper than the depth of the second pattern formed in the second pattern forming area, or the spacing between the first patterns formed in the first pattern forming area may be formed with a smaller spacing than the spacing between the second patterns formed in the second pattern forming area.

[0032] The depth of the first pattern formed in the first pattern forming area is formed deeper than the depth of the second pattern formed in the second pattern forming area, and the spacing between the first patterns formed in the first pattern forming area can be formed with a smaller spacing than the spacing between the second patterns formed in the second pattern forming area.

[0033] A plurality of first patterns are formed in a first pattern forming area, and a plurality of second patterns are formed in a second pattern forming area. The first patterns formed in the first pattern forming area have a depth of 10 to 100 µm and a diameter of 5 to 100 µm, and the spacing between the first patterns is 30 µm to 200 µm. The second patterns formed in the second pattern forming area also have a depth of 10 to 100 µm and a diameter of 5 to 100 µm, and the spacing between the second patterns is 30 µm to 200 µm.

[0034] A plurality of first patterns are formed in a first pattern forming area, and a plurality of second patterns are formed in a second pattern forming area, and the first patterns formed in the first pattern forming area may have the same size as each other, and the first patterns formed in the second pattern forming area may have the same size as each other.

[0035] The retaining portion further includes a third pattern forming area where a third pattern is formed and is positioned at a predetermined interval in the longitudinal direction (F) of the current collector in the second pattern forming area; and a second pattern non-forming area located between the second pattern forming area and the third pattern forming area, wherein the size of the third pattern formed in the third pattern forming area may differ from the size of the second pattern formed in the second pattern forming area.

[0036] The size of the third pattern formed in the third pattern forming area may be smaller than the size of the second pattern formed in the second pattern forming area.

[0037] The depth of the second pattern formed in the second pattern forming area may be formed deeper than the depth of the third pattern formed in the third pattern forming area, or the spacing between the second patterns formed in the second pattern forming area may be formed with a smaller spacing than the spacing between the third patterns formed in the third pattern forming area.

[0038] The depth of the second pattern formed in the second pattern forming area is formed deeper than the depth of the third pattern formed in the third pattern forming area, and the spacing between the second patterns formed in the second pattern forming area can be formed with a smaller spacing than the spacing between the third patterns formed in the third pattern forming area.

[0039] A plurality of third patterns are formed in the third pattern forming area, and the third patterns formed in the third pattern forming area have a depth of 10 to 100 µm, a diameter of 5 to 100 µm, and a spacing between the third patterns of 30 µm to 200 µm.

[0040] The third patterns formed in the third pattern forming area may have the same size as each other.

[0041] The retaining portion and the non-retaining portion, where the pattern forming area and the pattern non-retaining area are formed, are formed alternately along the length direction (F) of the current collector, and the retaining portions formed alternately may each have the pattern forming area and the pattern non-retaining area formed in the same shape.

[0042] The electrode forming device according to the present invention can form a pattern on an electrode to prevent the problem of lithium precipitation caused by the failure of lithium insertion and extraction from the electrode during rapid charging, and can be effectively applied in relation to the fact that pattern forming conditions may vary depending on the length and position of the electrode, and has the effect of preventing damage that may occur when a forming protrusion comes into contact with the electrode blank area.

[0043] The electrode manufactured by the electrode forming device according to the present invention can be effectively manufactured such that the insertion and extraction of lithium from the electrode occur smoothly during rapid charging, preventing lithium precipitation, and the pattern forming conditions may vary depending on the length and position, and damage that may occur when the forming protrusions come into contact with the uncoated area can be prevented.

[0044] FIG. 1 is a cross-sectional view illustrating an electrode forming apparatus according to Example 1 of the present invention.

[0045] FIG. 2 is a plan view illustrating an electrode according to Example 2 of the present invention, which is an electrode manufactured using an electrode forming device according to Example 1 of the present invention.

[0046] Hereinafter, preferred embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited or restricted by the following embodiments.

[0047] In order to clearly explain the present invention, detailed descriptions of related prior art that are irrelevant to the explanation or that may unnecessarily obscure the essence of the invention have been omitted. Furthermore, when assigning reference numerals to the components of each drawing in this specification, identical or similar reference numerals are assigned to identical or similar components throughout the entire specification.

[0048] Furthermore, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0049]

[0050] Example 1

[0051] FIG. 1 is a cross-sectional view illustrating an electrode forming apparatus according to Example 1 of the present invention. FIG. 2 is a plan view illustrating an electrode according to Example 2 of the present invention, which is an electrode manufactured using the electrode forming apparatus according to Example 1 of the present invention.

[0052] Referring to FIGS. 1 and 2, the electrode forming apparatus (10) according to Embodiment 1 of the present invention is an electrode forming apparatus (10) that forms an electrode (1) comprising a retaining portion (2) coated with an electrode active material and a non-coated portion (4) not coated with an electrode active material. The electrode forming apparatus (10) includes a roller unit (100). The roller unit (100) may refer to a forming unit having a roller shape. The roller unit (100) may be configured to form the retaining portion (2) of the electrode having a roller shape. The retaining portion (2) may refer to a portion coated with an electrode active material on an electrode current collector (5). For reference, the non-coated portion (4), which contrasts with the retaining portion (2), may refer to a portion not coated with an electrode active material on an electrode current collector (5).

[0053] Here, the roller unit (100) includes a body portion (110), a protrusion-forming area (120), and a protrusion-non-forming area (130).

[0054] The body portion (110) may have a cylindrical shape. It may be configured to rotate around a central axis (X). During the process of forming the electrode (1), the body portion (110) may rotate around the central axis (X), and the electrode may be formed during this rotation process. When the body portion (110) rotates around the central axis (X), the roller unit (100) moves linearly in the longitudinal direction (F) of the electrode (1). While moving in this way, the protrusion (120-a) formed in the protrusion forming area (120) forms a pattern (20-b) on the electrode (1).

[0055] A pattern (20-b), such as a groove, hole, or pore, can be formed on the electrode (1) through the protrusion (120-a) described below. This means that, in particular, a pattern (20-b), such as a groove or pore, can be formed on the retaining portion (2) of the electrode (1).

[0056] The protrusion forming area (120) may be a portion formed on the outer surface of the body portion (110) in which a protrusion (120-a) is formed to form a retaining portion (2). The protrusion (120-a) may be in the shape of a cylinder, a cone, a bar, a truncated cone, etc., and may also have various other protruding shapes.

[0057] The area where the protrusion is not formed (130) may be a part of the outer surface of the body part (110) where the protrusion (120-a) is not formed. It may have a flat surface, a smooth surface, or a flat surface without the protrusion (120-a).

[0058] These protrusion-forming regions (120) and non-protrusion-forming regions (130) are provided in multiple numbers on the body portion (110). The protrusion-forming regions (120) and non-protrusion-forming regions (130) are alternately located along the circumferential direction (C) of the body portion (110). Since the body portion (110) is cylindrical, the body portion (110) can be depicted as a circle when a cross-sectional view is drawn, and the circumferential direction (C) of the body portion (110) may refer to the circumferential direction of the circle on this cross-sectional view. The fact that the protrusion-forming area (120) and the protrusion-non-forming area (130) are formed alternately may mean that the protrusion-non-forming area (130) is formed between the protrusion-forming area (120) and the protrusion-forming area (120), and may also mean that the protrusion-forming area (120) is formed between the protrusion-non-forming area (130) and the protrusion-non-forming area (130).

[0059] By using an electrode forming device (10) of this type to form a groove-shaped pattern (20-b) on the retaining portion (2) of the electrode (1), the surface area of ​​the electrode active material coated on the surface of the electrode (1) is increased, thereby allowing for a smoother reaction to occur. Therefore, the problem of lithium precipitation can be prevented because the insertion and extraction of lithium from the electrode (1) do not occur smoothly during rapid charging. Even during rapid charging, smooth charging can be performed without lithium precipitation.

[0060] In addition, regarding the fact that the molding conditions of the pattern may differ depending on the length and position of the electrode (1), the electrode molding device (10) according to Embodiment 1 of the present invention can be effectively applied. That is, if a roller unit (100) is manufactured such that the protrusion forming area (120) touches the area where the pattern groove (20-b) is required (see pattern forming area (20) in FIG. 2) and the protrusion non-forming area (130) touches the area where the pattern groove (20-b) is not required (see pattern non-forming area (30) in FIG. 2), the pattern (20-b) can be molded quickly, accurately, and easily by rolling the roller unit (100) once.

[0061] Specifically, in the electrode forming device (10) according to Embodiment 1 of the present invention, the roller unit (100) may include a first protrusion forming area (121), a second protrusion forming area (122), and a first protrusion non-forming area (131) formed between them.

[0062] The first protrusion forming area (121) may be a portion where the first protrusion (121-a) is formed. The second protrusion forming area (122) may be a portion located at a predetermined distance from the first protrusion forming area (121) in the circumferential direction (C) of the body portion (110). The second protrusion (122-a) may be formed in the second protrusion forming area (122). The first protrusion non-forming area (131) may be a portion located between the first protrusion forming area (121) and the second protrusion forming area (122). The first protrusion non-forming area (131) may have a flat surface, a smooth surface, or a flat surface without a protrusion (120-a).

[0063] The size of the second protrusion (122-a) formed in the second protrusion forming region (122) may differ from the size of the second protrusion (122-a) formed in the first protrusion forming region (121). The second protrusion (122-a) may be larger or smaller than the first protrusion (121-a). In particular, the size of the second protrusion (122-a) formed in the second protrusion forming region (122) may be smaller than the size of the first protrusion (121-a) formed in the first protrusion forming region (121). Here, being small may mean having a small shape and size, and in particular, the height may be small. The height may be related to the depth of the pattern pores formed in the electrode (1). If the height is high, the depth of the pores may be formed deeply, and if the height is small, the depth of the pores may be formed shallowly. The deeper the depth of the pores, the relatively larger the surface area of ​​the active material part becomes, allowing the reaction to occur more smoothly. The shallower the depth of the pore, the relatively reduced surface area of ​​the active material portion may result in a less smooth reaction. Specifically, the height h2 of the second protrusion (122-a) may be smaller than the height h1 of the first protrusion (121-a). In this case, a faster and smoother reaction may be possible in the part of the electrode where the pattern is formed by the first protrusion (121-a).

[0064] Additionally, a plurality of first protrusions (121-a) may be formed in the first protrusion forming region (121), and a plurality of second protrusions (122-a) may also be formed in the second protrusion forming region (122). Specifically, the first protrusions (121-a) formed in the first protrusion forming region (121) may have a height (h1) of 10 to 100 µm, a diameter (D1) of 5 to 100 µm, and a spacing (d1) between the first protrusions (121-a) of 30 µm to 200 µm. Since a large diameter of the protrusion (120-a) means a large diameter of the pore formed in the electrode (1), an increase in the diameter of the protrusion (120-a) may be a factor in increasing the surface area of ​​the active material part and facilitating the reaction. If the spacing between the protrusions (120-a) increases, it means that the spacing between the pores formed in the electrode (1) increases, and thus the number of pores formed per unit area decreases. Therefore, if the spacing between the protrusions (120-a) increases, the surface area of ​​the active material part decreases, which can be a factor that prevents the reaction from proceeding smoothly, i.e., a cause of lithium precipitation.

[0065] The height, diameter, and spacing of the protrusions (120-a) are not necessarily better when they are larger or smaller when they are smaller; it may be important to form them in the necessary places and to the necessary extent. Therefore, the numerical range of the height, diameter, and spacing of the protrusions (120-a) mentioned above can be a value for the conditions of the electrode (1) used effectively.

[0066] The second protrusions (122-a) formed in the second protrusion forming region (122) may also have a height (h2) of 10 to 100 µm, a diameter (D2) of 5 to 100 µm, and a spacing (d2) between the second protrusions (122-a) of 30 µm to 200 µm, just like the first protrusions (121-a). As previously explained, the numerical range of the height, diameter, and spacing of these protrusions (120-a) can be a value for the conditions of the electrode (1) used effectively.

[0067] In one exemplary embodiment, the height of the first protrusion formed in the first protrusion forming area may be formed higher than the height of the second protrusion formed in the second protrusion forming area, or the spacing between the first protrusions formed in the first protrusion forming area may be formed with a smaller spacing than the spacing between the second protrusions formed in the second protrusion forming area.

[0068] When the electrode forming device according to Embodiment 1 of the present invention forms an electrode, the area formed by the first protrusion may be an area slightly closer to the center of the electrode's winding. When the electrode forms a jellyroll-type electrode assembly, it has a wound shape, and the part located at the center of this wound shape may be the center of the winding. The center of the electrode's winding is typically a place with high compressive stress. Therefore, the center of the winding may be an area where electrolyte impregnation is poor. Thus, if a pattern is deeply engraved in an area close to the center of the winding, the effect of better electrolyte impregnation can be obtained. When electrolyte impregnation is better, performance during rapid charging can be further improved.

[0069] If the height of the first protrusion formed slightly closer to the center of the winding is higher than the height of the second protrusion, the area slightly closer to the center of the winding can form a deeper pattern, thereby further improving performance.

[0070] Alternatively, if the pattern is cut more densely in the area close to the center of the winding, the effect of better electrolyte impregnation can be achieved. In other words, if the pattern spacing is formed smaller, the effect of better electrolyte impregnation can be achieved. When electrolyte impregnation is better, performance during rapid charging can be further improved.

[0071] If the spacing of the first protrusions formed slightly closer to the center of the winding is smaller than the spacing of the second protrusions, the area slightly closer to the center of the winding can form a denser pattern, thereby further improving performance.

[0072] In addition, to further enhance the effect, the depth and spacing of the patterns can be simultaneously made more advantageous. That is, the closer the area is to the center of the winding, the deeper the pattern is cut and the smaller the spacing between the patterns can be, which can yield a more significant effect on performance during rapid charging. To this end, the height of the first protrusion formed in the first protrusion forming area is formed to be higher than the height of the second protrusion formed in the second protrusion forming area, and the spacing between the first protrusions formed in the first protrusion forming area can be formed to be smaller than the spacing between the second protrusions formed in the second protrusion forming area.

[0073] In addition, a plurality of first protrusions (121-a) may be formed in the first protrusion forming area (121). Also, a plurality of second protrusions (122-a) may be formed in the second protrusion forming area (122). Furthermore, the first protrusions (121-a) formed in the first protrusion forming area (121) may have the same size as each other. For example, referring to FIG. 1, three first protrusions (121-a) may be formed. And these three first protrusions (121-a) may have the same height h1.

[0074] In addition, the second protrusions (122-a) formed in the second protrusion forming area (122) may also have the same size as each other. For example, referring to FIG. 1, three second protrusions (122-a) may be formed. And these three second protrusions (122-a) may have the same height h2.

[0075] And the roller unit (100) may further include a third protrusion forming area (123) and a second protrusion non-forming area (132). The third protrusion forming area (123) may be an area where the third protrusion (123-a) is formed. The third protrusion forming area (123) may be a portion located at a predetermined distance from the second protrusion forming area (122) in the circumferential direction (C) of the body portion (110). The second protrusion non-forming area (132) may be a portion located between the second protrusion forming area (122) and the third protrusion forming area (123). The second protrusion non-forming area (132) may also have a flat surface, a smooth surface, or a flat surface without the protrusion (120-a).

[0076] The size of the third protrusion (123-a) formed in the third protrusion forming area (123) may differ from the size of the second protrusion (122-a) formed in the second protrusion forming area (122). The third protrusion (123-a) may be larger or smaller than the second protrusion (122-a). In particular, the size of the third protrusion (123-a) formed in the third protrusion forming area (123) may be smaller than the size of the second protrusion (122-a) formed in the second protrusion forming area (122). Here, being small may mean having a small shape and size, and in particular, the height may be small.

[0077] The height may be related to the depth of the pores formed in the electrode (1). If the height is high, the depth of the pores may be formed deeply, and if the height is small, the depth of the pores may be formed shallowly. The deeper the depth of the pores, the relatively surface area of ​​the active material part increases, so the reaction may occur more smoothly. The shallower the depth of the pores, the relatively surface area of ​​the active material part decreases, so the reaction may not occur as smoothly. Specifically, the height h3 of the third protrusion (123-a) may be smaller than the height h2 of the second protrusion (122-a).

[0078] A plurality of third protrusions (123-a) may be formed in the third protrusion forming area (123). The third protrusions (123-a) formed in the third protrusion forming area (123) may also have a height (h3) of 10 to 100 µm, a diameter (D3) of 5 to 100 µm, and a spacing (d3) between the third protrusions (123-a) of 30 µm to 200 µm. The numerical ranges of the height, diameter, and spacing of these protrusions (120-a) may be values ​​for the conditions of the electrode (1) used effectively.

[0079] In one exemplary embodiment, the height of the second protrusion formed in the second protrusion forming area may be formed higher than the height of the third protrusion formed in the third protrusion forming area, or the spacing between the second protrusions formed in the second protrusion forming area may be formed with a spacing smaller than the spacing between the third protrusions formed in the third protrusion forming area.

[0080] When the electrode forming device according to Embodiment 1 of the present invention forms an electrode, the area formed by the second protrusion may be a region slightly closer to the center of the electrode's winding. The center of the electrode's winding is typically a region with high compressive stress. Therefore, the center of the winding may be a region where electrolyte impregnation is poor. Thus, if the pattern is deeply engraved in the area close to the center of the winding, the effect of better electrolyte impregnation can be obtained. When electrolyte impregnation is better, performance during rapid charging can be further improved.

[0081] If the height of the second protrusion formed slightly closer to the center of the winding is higher than the height of the third protrusion, the area slightly closer to the center of the winding can form a deeper pattern, thereby further improving performance.

[0082] Alternatively, if the pattern is cut more densely in the area close to the center of the winding, the effect of better electrolyte impregnation can be achieved. In other words, if the pattern spacing is formed smaller, the effect of better electrolyte impregnation can be achieved. When electrolyte impregnation is better, performance during rapid charging can be further improved.

[0083] If the spacing of the second protrusions formed slightly closer to the center of the winding is smaller than the spacing of the third protrusions, the area slightly closer to the center of the winding can form a denser pattern, thereby further improving performance.

[0084] In addition, to further enhance the effect, the depth and spacing of the patterns can be simultaneously made more advantageous. That is, the closer the area is to the center of the winding, the deeper the pattern is cut and the smaller the spacing between the patterns, which can yield a more significant effect on performance during rapid charging. To this end, the height of the second protrusion formed in the second protrusion forming area is formed to be higher than the height of the third protrusion formed in the third protrusion forming area, and the spacing between the second protrusions formed in the second protrusion forming area can be formed to be smaller than the spacing between the third protrusions formed in the third protrusion forming area.

[0085] The third protrusions (123-a) formed in the third protrusion forming area (123) may have the same size as each other. For example, referring to FIG. 1, three third protrusions (123-a) may be formed. And these three third protrusions (123-a) may have the same height h3.

[0086] Referring to FIG. 1, the electrode forming device (10) according to Embodiment 1 of the present invention can form grooves (or pores) of different depths depending on the part and location of the electrode (1). To this end, it may include protrusions (120-a) of different heights depending on the part and location of the body part (110). Accordingly, it has the effect of improving the performance of areas where rapid charging performance is inferior depending on the location. That is, for areas where rapid charging performance is inferior, the effect of performance improvement can be obtained by tailoring it to each location. And since forming that can obtain such an effect can be achieved with a single rotational movement of the roller unit (100), the work can be carried out very efficiently.

[0087] In addition, in the electrode forming device (10) according to Embodiment 1 of the present invention, the protrusion forming regions (120) may be manufactured to perform forming only on the 10% to 90% section (L1) of the total length (L) from the first retaining portion (2) formed on the electrode (1) to the last retaining portion (2) (see FIG. 2). In the outermost regions, i.e., regions less than 10% and regions more than 90%, the compressive stress is low and the electrolyte impregnation is good, so it may not be necessary to form pattern (20-b) grooves (or pores). Rather, not forming pattern grooves may result in superior performance.

[0088] Meanwhile, in the electrode forming device (10) according to Embodiment 1 of the present invention, the protrusion forming regions (120) may be configured to be located on the retaining portion (2) to form the retaining portion (2), and the length (M) from the end point of the last protrusion forming region (120) to the start point of the first protrusion forming region (120) based on the circumferential direction (C) of the body portion (110) may be 100% to 110% of the length (N) of the non-retaining portion (4). Specifically, referring to FIG. 1, assuming there is a point moving in the direction of arrow C on the circular circumference of the body portion (110), the distance this point moves from the end of the third protrusion forming region (123) to the start of the first protrusion forming region (121) may be M. And this means that the length of M can be 100% to 110% of the length N of the unincorporated portion (4) of the electrode (1) shown in Fig. 2.

[0089] The area of ​​this M portion may be an area corresponding to the bare portion (4) when the roller unit (100) rotates on the electrode (1). That is, since there is no need to form a protrusion (120-a) on the bare portion (4), the protrusion (120-a) is not formed on the M portion to prevent damage to the bare portion (4) (i.e., to prevent damage caused by the protrusion (120-a)). However, if the length of M is shorter than the length of N, the protrusion (120-a) of the protrusion formation area (120) may come into contact with the bare portion (4). Therefore, if the length of M exceeds 100% of the length of N, the problem of the bare portion (4) being damaged by the protrusion (120-a) can be prevented. On the other hand, if the length of M is too large compared to the length of N, a large portion of the retaining portion (2) that needs to be formed corresponds to M, so there may be too many unformed portions in the retaining portion (2). Therefore, the length of M must be less than 110% of the length of N.

[0090] The electrode forming device (10) according to Example 1 of the present invention has these features, thereby preventing damage that may occur when a forming projection (120-a) comes into contact with the electrode (1) non-existent portion (4).

[0091]

[0092] Example 2

[0093] FIG. 2 is a plan view illustrating an electrode according to Example 2 of the present invention, which is an electrode manufactured using an electrode forming device according to Example 1 of the present invention.

[0094] Example 2 of the present invention differs from Example 1 in that it relates to an electrode manufactured using an electrode forming device according to Example 1 of the present invention.

[0095] Content common to Example 1 will be omitted as much as possible, and Example 2 will be described. That is, it is obvious that if content not explained in Example 2 is necessary, it can be considered as content of Example 1.

[0096] Referring to FIG. 2, the electrode (1) according to Example 2 of the present invention is an electrode (1) manufactured using the electrode forming device (10) according to Example 1. Accordingly, the electrode (1) according to Example 2 of the present invention relates to an electrode (1) comprising a retaining portion (2) and a non-retaining portion (4). The electrode (1) may be in the form of a plate made of metal or a thin film-shaped current collector (5) on which the active material of the electrode (1) is coated. In the electrode (1) according to Example 2 of the present invention, the retaining portion (2) may be a portion of the electrode (1) on which the active material of the electrode (1) is coated on the current collector (5). The non-retaining portion (4) may be a portion on the current collector (5) on which the active material of the electrode (1) is not coated.

[0097] And the retaining portion (2) includes a pattern forming area (20) and a pattern non-forming area (30). The pattern forming area (20) is a portion where a pattern (20-b) in the shape of an indented groove is formed. And the pattern non-forming area (30) is a portion where a pattern (20-b), such as an indented groove shape, is not formed. The pattern forming area (20) may be a portion formed by the protrusion forming area (120) in the electrode forming device according to Example 1. As the roller unit rotates, the protrusion (120-a) included in the protrusion forming area (120) may press the retaining portion (2) of the electrode (1) to form a hole in the retaining portion (2).

[0098] The pattern-unformed region (30) may be a part corresponding to the protrusion-unformed region (130) in the electrode forming device according to Example 1. Even if the roller unit rotates, since there is no protrusion (120-a) in the protrusion-unformed region (130), a pattern (20-b), such as a pore, is not formed in the retaining part (2) of the electrode (1). The pattern (20-b) may be a shape such as a groove, a hole, or a pore.

[0099] Corresponding to the protrusion forming area (120) and the protrusion non-forming area (130) of the electrode forming device of Example 1, a plurality of pattern forming areas (20) and pattern non-forming areas (30) are also provided. The pattern forming area (20) and the pattern non-forming area (30) are alternately positioned along the longitudinal direction (F) of the current collector (5) on the holding part (2). The roller unit can move while pressing the surface of the electrode (1) as it rotates about the central axis (X). In this case, the roller unit can form a pattern (20-b) on the electrode (1) while moving along the longitudinal direction (F) of the current collector (5).

[0100] The electrode (1) of this type can increase the surface area of ​​the electrode active material coated on the electrode surface, thereby enabling a smooth reaction. Therefore, the problem of lithium precipitation can be prevented because the insertion and extraction of lithium from the electrode (1) do not occur smoothly during rapid charging. Even during rapid charging, smooth charging can be performed without lithium precipitation. In addition, regarding the fact that pattern forming conditions may differ depending on the length and position of the electrode (1), the electrode (1) according to Embodiment 2 of the present invention can be effectively manufactured.

[0101] Specifically, in the electrode (1) according to embodiment 2 of the present invention, the retaining portion (2) may include a first pattern forming area (21), a second pattern forming area (22), and a first pattern non-forming area (31) formed between them.

[0102] The first pattern forming area (21) may be a portion where the first pattern (21-b) is formed. The second pattern forming area (22) may be a portion located at a predetermined distance from the first pattern forming area (21) in the longitudinal direction (F) of the current collector (5). The second pattern (22-b) may be formed in the second pattern forming area (22). The first pattern non-forming area (31) may be a portion located between the first pattern forming area (21) and the second pattern forming area (22). The first pattern non-forming area (31) means that there is no pattern (20-b) on the retaining portion (2), and the retaining portion (2) may have a flat surface, a smooth surface, or a flat surface.

[0103] The size of the second pattern (22-b) formed in the second pattern forming area (22) may differ from the size of the first pattern (21-b) formed in the first pattern forming area (21). The second pattern (22-b) may be larger or smaller than the first pattern (21-b). In particular, the size of the second pattern (22-b) formed in the second pattern forming area (22) may be smaller than the size of the first pattern (21-b) formed in the first pattern forming area (21). Here, being smaller may mean having a small shape and size, and in particular, the depth may be small. The deeper the depth of the pores in the pattern, the relatively larger the surface area of ​​the active material part becomes, allowing the reaction to occur more quickly and smoothly. The shallower the depth of the pores, the relatively smaller the surface area of ​​the active material part becomes, which may result in a less smooth reaction.

[0104] Additionally, a plurality of first patterns (21-b) may be formed in the first pattern forming region (21), and a plurality of second patterns (22-b) may also be formed in the second pattern forming region (22). Specifically, the first patterns (21-b) formed in the first pattern forming region (21) may have a depth of 10 to 100 µm and a diameter of 5 to 100 µm, and the spacing between the first patterns (21-b) may be 30 µm to 200 µm. Since a large diameter of the pattern (20-b) means a large diameter of the pore formed in the electrode (1), an increase in the diameter of the pattern (20-b) may be a factor in increasing the surface area of ​​the active material part and making the reaction smoother. If the spacing of the pattern (20-b) increases, it means that the spacing between the pores formed in the electrode (1) increases, and thus the number of pores formed per unit area decreases. Therefore, if the spacing between the pattern (20-b) increases, the surface area of ​​the active material part is relatively reduced, and this can be a factor that prevents the reaction from proceeding smoothly, i.e., a cause of lithium precipitation.

[0105] The depth, diameter, and spacing of the pattern (20-b) are not necessarily better when they are larger or smaller when they are smaller; it may be important to form them in the necessary places to the necessary extent. Therefore, the numerical range of the depth, diameter, and spacing of the pattern mentioned above can be a value for the conditions of the electrode (1) used effectively.

[0106] The depth of the first pattern formed in the first pattern forming area may be formed deeper than the depth of the second pattern formed in the second pattern forming area, or the spacing between the first patterns formed in the first pattern forming area may be formed with a smaller spacing than the spacing between the second patterns formed in the second pattern forming area.

[0107] In the electrode according to Example 2 of the present invention, the region where the first pattern is formed may be a region slightly closer to the center of the electrode winding. The center of the electrode winding is typically a region with high compressive stress. Therefore, the center of the winding may be a region where electrolyte impregnation is poor. Thus, if the pattern is deeply etched in the region close to the center of the winding, the effect of better electrolyte impregnation can be obtained. When electrolyte impregnation is better, performance during rapid charging can be further improved.

[0108] If the depth of the first pattern located slightly closer to the center of the winding is deeper than the depth of the second pattern, the area slightly closer to the center of the winding can form a deeper pattern, thereby further improving performance.

[0109] Alternatively, if the pattern is cut more densely in the area close to the center of the winding, the effect of better electrolyte impregnation can be achieved. In other words, if the pattern spacing is formed smaller, the effect of better electrolyte impregnation can be achieved. When electrolyte impregnation is better, performance during rapid charging can be further improved.

[0110] If the spacing of the first pattern formed slightly closer to the center of the winding is smaller than the spacing of the second pattern, the area slightly closer to the center of the winding can form a denser pattern, thereby further improving performance.

[0111] Furthermore, to further enhance the effect, the depth and spacing of the patterns can be simultaneously made more advantageous. That is, digging the pattern deeper and making the spacing between patterns smaller in areas closer to the center of the winding can yield a more significant effect on performance during rapid charging. To this end, the depth of the first pattern formed in the first pattern forming area is formed deeper than the depth of the second pattern formed in the second pattern forming area, and the spacing between the first patterns formed in the first pattern forming area can be formed with a smaller spacing than the spacing between the second patterns formed in the second pattern forming area.

[0112] The second patterns (22-b) formed in the second pattern forming area (22) may have a depth of 10 to 100 µm, a diameter of 5 to 100 µm, and a spacing between the second patterns (22-b) of 30 µm to 200 µm, just like the first patterns (21-b). As previously explained, the numerical ranges of the depth, diameter, and spacing of these patterns may be values ​​for the conditions of the electrode (1) used effectively.

[0113] In addition, a plurality of first patterns (21-b) may be formed in the first pattern forming area (21). Also, a plurality of second patterns (22-b) may be formed in the second pattern forming area (22). Furthermore, the first patterns (21-b) formed in the first pattern forming area (21) may have the same size as each other. For example, referring to FIG. 2, three first patterns (21-b) (e.g., pores) may be formed. And these three first patterns (21-b) (i.e., pores) may have the same depth as each other.

[0114] In addition, the second patterns (22-b) formed in the second pattern forming area (22) may also have the same size as each other. For example, referring to FIG. 2, three second patterns (22-b) (e.g., pores) may be formed. And these three second patterns (22-b) may have the same depth as each other.

[0115] And the retaining portion (2) may further include a third pattern forming area (23) and a second pattern non-forming area (32). The third pattern forming area (23) may be an area where the third pattern (23-b) is formed. The third pattern forming area (23) may be a portion located at a predetermined distance in the longitudinal direction of the current collector (5) from the second pattern forming area (22). The second pattern non-forming area (32) may be a portion located between the second pattern forming area (22) and the third pattern forming area (23). The second pattern non-forming area (32) may also have a flat surface, a smooth surface, or a flat surface without a pattern (20-b).

[0116] The size of the third pattern (23-b) formed in the third pattern forming area (23) may differ from the size of the second pattern (22-b) formed in the second pattern forming area (22). The third pattern (23-b) may be larger or smaller than the second pattern (22-b). In particular, the size of the third pattern (23-b) formed in the third pattern forming area (23) may be smaller than the size of the second pattern (22-b) formed in the second pattern forming area (22). Here, being smaller may mean having a small shape and size, and in particular, the depth may be small.

[0117] The deeper the pore depth, the relatively larger the surface area of ​​the active material part becomes, allowing the reaction to occur more smoothly. The shallower the pore depth, the relatively smaller the surface area of ​​the active material part becomes, which may result in a less smooth reaction. Specifically, the depth of the third pattern (23-b) may be smaller than the depth of the second pattern (22-b). In this case, the reaction may occur faster and more smoothly in the second pattern formation region.

[0118] A plurality of third patterns (23-b) may be formed in the third pattern forming area (23). The third patterns (23-b) formed in the third pattern forming area (23) may also have a depth of 10 to 100 µm, a diameter of 5 to 100 µm, and a spacing between the third patterns (23-b) of 30 µm to 200 µm. The numerical range of the depth, diameter, and spacing of these patterns (20-b) may be values ​​for the conditions of the electrode (1) used effectively.

[0119] The depth of the second pattern formed in the second pattern forming area may be formed deeper than the depth of the third pattern formed in the third pattern forming area, or the spacing between the second patterns formed in the second pattern forming area may be formed with a smaller spacing than the spacing between the third patterns formed in the third pattern forming area.

[0120] In the electrode according to Example 2 of the present invention, the region where the second pattern is formed may be a region slightly closer to the center of the electrode's winding. The center of the electrode's winding is typically a region with high compressive stress. Therefore, the center of the winding may be a region where electrolyte impregnation is poor. Thus, if the pattern is deeply etched in the region closer to the center of the winding, the effect of better electrolyte impregnation can be obtained. When electrolyte impregnation is better, performance during rapid charging can be further improved.

[0121] If the depth of the second pattern located slightly closer to the center of the winding is deeper than the depth of the third pattern, the area slightly closer to the center of the winding can form a deeper pattern, thereby further improving performance.

[0122] Alternatively, if the pattern is cut more densely in the area close to the center of the winding, the effect of better electrolyte impregnation can be achieved. In other words, if the pattern spacing is formed smaller, the effect of better electrolyte impregnation can be achieved. When electrolyte impregnation is better, performance during rapid charging can be further improved.

[0123] If the spacing of the second pattern formed slightly closer to the center of the winding is smaller than the spacing of the third pattern, the area slightly closer to the center of the winding can form a denser pattern, thereby further improving performance.

[0124] In addition, to further enhance the effect, the depth and spacing of the patterns can be simultaneously made more advantageous. That is, the closer the area is to the center of the winding, the deeper the pattern is dug and the smaller the spacing between the patterns, which can yield a more significant effect on performance during rapid charging. To this end, the depth of the second pattern formed in the second pattern forming area is formed deeper than the depth of the third pattern formed in the third pattern forming area, and the spacing between the second patterns formed in the second pattern forming area can be formed with a smaller spacing than the spacing between the third patterns formed in the third pattern forming area.

[0125] The third patterns (23-b) formed in the third pattern forming area (23) may have the same size as each other. For example, referring to FIG. 2, three third patterns (23-b) may be formed. And these three third patterns (23-b) may have the same depth as each other.

[0126] Referring to FIG. 2, the electrode (1) according to Embodiment 2 of the present invention may have grooves (or pores) of different depths formed according to parts and locations of the electrode (1). Accordingly, the performance of areas where rapid charging performance is inferior can be improved depending on the location. That is, for areas where rapid charging performance is inferior, the effect of performance improvement can be achieved by tailoring it to each location. Furthermore, molding capable of achieving such an effect can be achieved with a single rotational movement of the roller unit.

[0127] The electrode (1) according to Example 2 of the present invention of this type can be effectively manufactured using the molding device according to Example 1 of the present invention, in relation to the fact that the pattern (20-b) molding conditions may differ depending on the length and position.

[0128] Meanwhile, in the electrode (1) according to Embodiment 2 of the present invention, the retaining portion (2) and the non-retaining portion (4) may be formed alternately along the longitudinal direction (F) of the current collector (5). Here, the same pattern forming area (20) and pattern non-forming area (30) may be formed in each retaining portion (2). That is, the retaining portions (2) formed alternately may each have a pattern forming area (20) and a pattern non-forming area (30) of the same shape formed in each other.

[0129] This may be because a roller unit for molding rolls in one direction and regularly forms a pattern (20-b) on the retaining portion. Also, as described in Example 1 above, damage that may occur when the molding protrusion (120-a) comes into contact with the retaining portion (4) can be prevented by adjusting the length of the part of the body (110) of the roller unit (100) corresponding to the retaining portion (4).

[0130]

[0131] Although the present invention has been described above by limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs.

[0132] [Explanation of the symbol]

[0133] 1: Electrode

[0134] 2: Maintenance section

[0135] 4: Mujibu

[0136] 5: The whole house

[0137] 20: Pattern formation area

[0138] 20-b: Pattern

[0139] 21: First pattern forming area

[0140] 21-b: Pattern 1

[0141] 22: Second pattern formation area

[0142] 22-b: Pattern 2

[0143] 23: Third pattern formation area

[0144] 23-b: Third pattern

[0145] 30: Pattern-unformed area

[0146] 31: First pattern non-formation area

[0147] 32: Second pattern non-formation region

[0148] 10: Electrode forming device

[0149] 100: Roller unit

[0150] 110: Body part

[0151] 120: Protrusion formation area

[0152] 120-a: protrusion

[0153] 121: First protrusion formation region

[0154] 121-a: 1st projection

[0155] 122: Second protrusion formation region

[0156] 122-a: Second projection

[0157] 123: Third protrusion formation region

[0158] 123-a: Third projection

[0159] 130: Area of ​​non-formed protrusions

[0160] 131: First protrusion unformed region

[0161] 132: Second protrusion unformed region

[0162] X: Central axis

[0163] C: Circumferential direction of the body

[0164] F: Length direction of the entire house

[0165] N: Length of the lower back

Claims

1. An electrode forming device for forming an electrode comprising a retaining portion coated with an electrode active material and a non-coated portion not coated with an electrode active material, It includes a roller unit that forms the retaining part having the shape of a roller, and The above roller unit is, Cylindrical body part; A protrusion forming region in which a protrusion forming the retaining portion is formed on the outer surface of the above body portion; and It includes a non-protrusion region on the outer surface of the body portion where the protrusion is not formed, and The above-mentioned protrusion-forming region and the above-mentioned non-protrusion-forming region are provided in multiple numbers, and The electrode forming device in which the above-mentioned protrusion forming region and the above-mentioned non-protrusion forming region are alternately located along the circumferential direction (C) of the body portion.

2. In Claim 1, The above roller unit is, A first protrusion forming region where a first protrusion is formed; A second protrusion forming region in which a second protrusion is formed, positioned at a predetermined distance in the circumferential direction of the body part in the first protrusion forming region; and It includes a first non-protrusion region located between the first protrusion forming region and the second protrusion forming region, and An electrode forming device characterized in that the size of the second protrusion formed in the second protrusion forming region is different from the size of the first protrusion formed in the first protrusion forming region.

3. In Claim 2, An electrode forming device characterized in that the size of the second protrusion formed in the second protrusion forming region is smaller than the size of the first protrusion formed in the first protrusion forming region.

4. In Claim 2, The height of the first protrusion formed in the first protrusion forming region is formed to be higher than the height of the second protrusion formed in the second protrusion forming region, or An electrode forming device characterized in that the spacing between the first protrusions formed in the first protrusion forming region is formed to be smaller than the spacing between the second protrusions formed in the second protrusion forming region.

5. In Claim 2, The height of the first protrusion formed in the first protrusion forming region is formed to be higher than the height of the second protrusion formed in the second protrusion forming region, and also An electrode forming device characterized in that the spacing between the first protrusions formed in the first protrusion forming region is formed to be smaller than the spacing between the second protrusions formed in the second protrusion forming region.

6. In claim 2 or claim 3, A plurality of first protrusions are formed in the first protrusion forming region, and A plurality of second protrusions are also formed in the above-mentioned second protrusion forming area, and The first protrusions formed in the first protrusion forming region have a height (h1) of 10 to 100 µm, a diameter (D1) of 5 to 100 µm, and a spacing (d1) between the first protrusions of 30 µm to 200 µm. An electrode forming device characterized in that the second protrusions formed in the second protrusion forming region also have a height (h2) of 10 to 100 µm, a diameter (D2) of 5 to 100 µm, and a spacing (d2) between the second protrusions of 30 µm to 200 µm.

7. In claim 2 or claim 3, A plurality of first protrusions are formed in the first protrusion forming region, and A plurality of second protrusions are also formed in the above-mentioned second protrusion forming area, and The first protrusions formed in the first protrusion forming region are of the same size as each other, An electrode forming device characterized in that the second protrusions formed in the second protrusion forming region are of the same size as each other.

8. In Claim 2, The above roller unit is, A third protrusion forming region in which a third protrusion is formed, positioned at a predetermined distance in the circumferential direction of the body part in the second protrusion forming region; and It further includes a second non-protrusion region located between the second protrusion forming region and the third protrusion forming region, An electrode forming device characterized in that the size of the third protrusion formed in the third protrusion forming region is different from the size of the second protrusion formed in the second protrusion forming region.

9. In Claim 8, An electrode forming device characterized in that the size of the third protrusion formed in the third protrusion forming region is smaller than the size of the second protrusion formed in the second protrusion forming region.

10. In Claim 8, The height of the second protrusion formed in the second protrusion forming region is formed to be higher than the height of the third protrusion formed in the third protrusion forming region, or An electrode forming device characterized in that the spacing between the second protrusions formed in the second protrusion forming region is formed to be smaller than the spacing between the third protrusions formed in the third protrusion forming region.

11. In Claim 8, The height of the second protrusion formed in the second protrusion forming region is formed to be higher than the height of the third protrusion formed in the third protrusion forming region, and also An electrode forming device characterized in that the spacing between the second protrusions formed in the second protrusion forming region is formed to be smaller than the spacing between the third protrusions formed in the third protrusion forming region.

12. In claim 8 or claim 9, A plurality of third protrusions are formed in the above-mentioned third protrusion forming region, and An electrode forming device characterized in that the third protrusions formed in the third protrusion forming region have a height (h3) of 10 to 100 µm, a diameter (D3) of 5 to 100 µm, and a spacing (d3) between the third protrusions of 30 µm to 200 µm.

13. In claim 8 or claim 9, An electrode forming device characterized in that the third protrusions formed in the third protrusion forming region are of the same size as each other.

14. In Claim 1, The above-mentioned protrusion-forming regions are, An electrode forming device characterized by performing forming only on a section (L1) of 10% to 90% of the total length (L) from the first retaining portion to the last retaining portion formed on the electrode.

15. In Claim 1, The above-mentioned protrusion-forming regions are located on the retaining portion to form the retaining portion, and Based on the circumferential direction (C) of the above body part, An electrode forming device characterized in that the length (M) from the end point of the last protrusion forming region to the start point of the first protrusion forming region is 100% to 110% of the length (N) of the unworn portion.

16. A retaining portion coated with an electrode active material on a current collector; and In an electrode comprising an uncoated portion on the above-mentioned current collector in which the electrode active material is not coated, The above-mentioned retaining portion includes a pattern forming area in which a pattern with an indented groove shape is formed and a pattern non-forming area in which the pattern is not formed, and The above pattern forming region and the above pattern non-forming region are provided in multiple numbers, and The pattern forming region and the pattern non-forming region are electrodes alternately located along the longitudinal direction (F) of the current collector on the retaining portion.

17. In Claim 16, The above maintenance part is, A first pattern forming region where a first pattern is formed; A second pattern forming region located at a predetermined distance apart in the longitudinal direction (F) of the current collector in the first pattern forming region, and in which a second pattern is formed; and It includes a first pattern non-forming region located between the first pattern forming region and the second pattern forming region, and An electrode characterized in that the size of the second pattern formed in the second pattern forming region is different from the size of the second pattern formed in the first pattern forming region.

18. In Claim 17, An electrode characterized in that the size of the second pattern formed in the second pattern forming region is smaller than the size of the first pattern formed in the first pattern forming region.

19. In Claim 17, The depth of the first pattern formed in the first pattern forming region is formed to be deeper than the depth of the second pattern formed in the second pattern forming region, or An electrode characterized in that the spacing between the first patterns formed in the first pattern forming region is formed to be smaller than the spacing between the second patterns formed in the second pattern forming region.

20. In Claim 17, The depth of the first pattern formed in the first pattern forming region is formed deeper than the depth of the second pattern formed in the second pattern forming region, and also An electrode characterized in that the spacing between the first patterns formed in the first pattern forming region is formed to be smaller than the spacing between the second patterns formed in the second pattern forming region.

21. In claim 17 or claim 18, A plurality of first patterns are formed in the first pattern forming area, and A plurality of second patterns are also formed in the above-mentioned second pattern forming area, and The first patterns formed in the first pattern forming region have a depth of 10 to 100 µm and a diameter of 5 to 100 µm, and the spacing between the first patterns is 30 µm to 200 µm, and An electrode characterized in that the second patterns formed in the second pattern forming region also have a depth of 10 to 100 µm, a diameter of 5 to 100 µm, and a spacing between the second patterns of 30 µm to 200 µm.

22. In claim 17 or claim 18, A plurality of first patterns are formed in the first pattern forming area, and A plurality of second patterns are also formed in the above-mentioned second pattern forming area, and The first patterns formed in the first pattern forming area are of the same size as each other, and An electrode characterized in that the first patterns formed in the second pattern forming region are of the same size as each other.

23. In Claim 17, The above maintenance part is, A third pattern forming region located at a predetermined interval in the longitudinal direction (F) of the current collector in the second pattern forming region, and in which a third pattern is formed; and It further includes a second pattern non-forming region located between the second pattern forming region and the third pattern forming region, and An electrode characterized in that the size of the third pattern formed in the third pattern forming region is different from the size of the second pattern formed in the second pattern forming region.

24. In Claim 23, An electrode characterized in that the size of the third pattern formed in the third pattern forming region is smaller than the size of the second pattern formed in the second pattern forming region.

25. In Claim 23, The depth of the second pattern formed in the second pattern forming region is formed to be deeper than the depth of the third pattern formed in the third pattern forming region, or An electrode characterized in that the spacing between the second patterns formed in the second pattern forming region is formed to be smaller than the spacing between the third patterns formed in the third pattern forming region.

26. In Claim 23, The depth of the second pattern formed in the second pattern forming region is formed deeper than the depth of the third pattern formed in the third pattern forming region, and also An electrode characterized in that the spacing between the second patterns formed in the second pattern forming region is formed to be smaller than the spacing between the third patterns formed in the third pattern forming region.

27. In claim 23 or claim 24, A plurality of third patterns are formed in the above-mentioned third pattern forming region, and An electrode characterized in that the third patterns formed in the third pattern forming region have a depth of 10 to 100 µm, a diameter of 5 to 100 µm, and a spacing between the third patterns of 30 µm to 200 µm.

28. In claim 23 or claim 24, An electrode characterized in that the third patterns formed in the third pattern forming region are of the same size as each other.

29. In Claim 16, The retaining portion and the non-retaining portion, in which the pattern forming area and the pattern non-retaining area are formed, are formed alternately along the length direction (F) of the current collector, and The electrode is characterized in that the alternately formed retaining portions each have a pattern-forming region and a pattern-non-forming region formed in the same shape as each other.

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