Dry electrode manufacturing apparatus, dry electrode manufacturing method, and dry electrode film

Abstract

The invention relates to a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a dry electrode film. A dry electrode manufacturing apparatus according to an embodiment includes: a powder supply section supplying powder; a first roller and a second roller that calender the powder supplied from the powder supply portion to form an electrode film; and a third roller and a fourth roller that stretch the electrode film rolled by the first roller and the second roller. The first roller rotates at a first speed in a first direction, the second roller rotates at a second speed in a second direction different from the first direction, the third roller rotates at a third speed in a third direction different from the second direction, and the fourth roller rotates at a fourth speed in a fourth direction different from the third direction. A linear velocity of the second roller in the second direction is greater than a linear velocity of the first roller in the first direction, a linear velocity of the third roller in the third direction is greater than a linear velocity of the second roller in the second direction, and a linear velocity of the fourth roller in the fourth direction is greater than a linear velocity of the third roller in the third direction.

Description

Technical Field

[0001] The present disclosure relates to a dry electrode manufacturing device, a dry electrode manufacturing method and a dry electrode film. Background Art

[0002] Generally, a rechargeable battery is a battery that can be repeatedly charged and discharged.

[0003] Demand for a manufacturing method of manufacturing a dry electrode for a rechargeable battery without using a solvent has recently increased.

[0004] In the conventional manufacturing method of the dry electrode, a mixture containing an active material, a conductive material and a binder can be fiberized into a fiber dry powder using a kneading device, etc., and the fiber dry powder can be calendered and stretched into a self-supporting film using a calendering roller, etc., and then the self-supporting film can be laminated on a current collector to manufacture a dry electrode. However, during the stretching process of stretching the self-supporting film, cracks or defects may occur in the self-supporting film. In this case, the self-supporting film may break during the subsequent lamination process. Summary of the invention

[0005] The embodiment provides a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a dry electrode film capable of preventing film breakage for an electrode. However, the problem to be solved by the embodiment is not limited to the above problem, and various extensions can be made within the scope of the technical idea included in the embodiment.

[0006] The dry electrode manufacturing apparatus according to the embodiment includes: a powder supply part configured to supply powder; a first roller and a second roller configured to roll the powder supplied from the powder supply part to form an electrode film; and a third roller and a fourth roller configured to stretch the rolled electrode film formed by the first roller and the second roller. The first roller is configured to rotate at a first speed in a first direction, the second roller is configured to rotate at a second speed in a second direction different from the first direction, the third roller is configured to rotate at a third speed in a third direction different from the second direction, the fourth roller is configured to rotate at a fourth speed in a fourth direction different from the third direction, and the dry electrode manufacturing apparatus is configured so that the linear speed of the second roller in the second direction is greater than the linear speed of the first roller in the first direction, the linear speed of the third roller in the third direction is greater than the linear speed of the second roller in the second direction, and the linear speed of the fourth roller in the fourth direction is greater than the linear speed of the third roller in the third direction.

[0007] The dry electrode manufacturing apparatus may be configured such that the second rotational speed of the second roller may be greater than the first rotational speed of the first roller, the third rotational speed of the third roller may be greater than the second rotational speed of the second roller, and the fourth rotational speed of the fourth roller may be greater than the third rotational speed of the third roller.

[0008] The dry electrode manufacturing apparatus may further include a fifth roller contacting the first roller and configured to rotate in a direction different from the first direction.

[0009] The diameter of the second roller may be greater than the diameter of the first roller, the diameter of the third roller may be greater than the diameter of the second roller, and the diameter of the fourth roller may be greater than the diameter of the third roller.

[0010] The diameter of the fifth roller may be substantially the same as the diameter of the first roller, the diameter of the second roller, the diameter of the third roller, and the diameter of the fourth roller.

[0011] The diameter of the fifth roller may be substantially the same as the diameter of the first roller.

[0012] The diameter of the fifth roller may be greater than the diameter of the first roller, and the diameter of the fourth roller may be substantially the same as the diameter of the first roller.

[0013] The diameter of the fifth roller may be greater than the diameter of the first roller, and the diameter of the fourth roller may be substantially the same as the diameter of the fifth roller.

[0014] The dry electrode manufacturing apparatus according to other embodiments includes: a powder supply part configured to supply powder; a first roller and a second roller configured to roll the powder supplied from the powder supply part to form an electrode film; and a third roller and a fourth roller configured to stretch the rolled electrode film formed by the first roller and the second roller. The surface adhesion of the second roller is greater than the surface adhesion of the first roller, the surface adhesion of the third roller is greater than the surface adhesion of the second roller, and the surface adhesion of the fourth roller is greater than the surface adhesion of the third roller.

[0015] The surface roughness of the second roller may be greater than that of the first roller, the surface roughness of the third roller may be greater than that of the second roller, and the surface roughness of the fourth roller may be greater than that of the third roller.

[0016] The first protrusion may be disposed on the surface of the second roller, the second protrusion may be disposed on the surface of the third roller, the third protrusion may be disposed on the surface of the fourth roller, the width and height of the second protrusion may be greater than the width and height of the first protrusion, and the width and height of the third protrusion may be greater than the width and height of the second protrusion.

[0017] The manufacturing method of the dry electrode according to the embodiment includes: supplying powder between a first roller and a second roller; rolling the powder to form an electrode film by rotating the first roller at a first rotation speed in a first direction and rotating the second roller at a second rotation speed in a second direction different from the first direction; and stretching the rolled electrode film by a third roller and a fourth roller. The electrode film is sequentially transferred to the second roller, the third roller, and the fourth roller.

[0018] The third roller may rotate at a third rotation speed in a third direction different from the second direction, the fourth roller may rotate at a fourth rotation speed in a fourth direction different from the third direction, the second rotation speed of the second roller may be greater than the first rotation speed of the first roller, the third rotation speed of the third roller may be greater than the second rotation speed of the second roller, and the fourth rotation speed of the fourth roller may be greater than the third rotation speed of the third roller.

[0019] The first rotational speed of the first roller, the second rotational speed of the second roller, the third rotational speed of the third roller, and the fourth rotational speed of the fourth roller may be substantially the same.

[0020] According to the embodiment, a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a dry electrode capable of preventing a film for an electrode from being broken may be provided.

[0021] It is apparent that the effects of the embodiment are not limited to the above-described effects, and various extensions may be made without departing from the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to an embodiment.

[0023] Figure 2 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to other embodiments.

[0024] Figure 3 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to other embodiments.

[0025] Figure 4 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to other embodiments.

[0026] Figure 5 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to other embodiments.

[0027] Figure 6 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to other embodiments.

[0028] Figure 7 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to other embodiments.

[0029] Figure 8 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to other embodiments.

[0030] <Description of Reference Numerals>

[0031] PMS: Powder supply section or fine powder supply section

[0032] PM: powder or fine powder

[0033] RL1, RL11, RL2, RL21, RL22, RL3, RL31, RL32, RL33, RL4, RL41, RL42, RL5, RL51, RL52: Roller

[0034] ST1, ST2, ST3: Raised DETAILED DESCRIPTION

[0035] Hereinafter, embodiments of the present disclosure will be described more fully with reference to the accompanying drawings so that those skilled in the art can easily implement the embodiments. The present disclosure can be modified in various different ways, all without departing from the scope of the present disclosure.

[0036] In order to clearly describe the present disclosure, parts or portions irrelevant to the description are omitted, and the same or similar constituent elements throughout the specification are denoted by the same reference numerals.

[0037] In addition, the accompanying drawings are provided only to make the embodiments disclosed in this specification easy to understand and should not be interpreted as limiting the scope of the disclosure in this specification. It should be understood that the disclosure includes all modifications, equivalents and substitutes without departing from the scope of the disclosure.

[0038] In addition, in the drawings, for ease of description, the size and thickness of each element are arbitrarily illustrated, and the present disclosure is not necessarily limited to those illustrated in the drawings. In the drawings, the thickness of layers, films, panels, regions, areas, etc. are exaggerated for clarity. In the drawings, the thickness of some layers and areas is exaggerated for ease of description.

[0039] It will be understood that when an element (such as a layer, film, region, area, or substrate) is referred to as being "on" or "over" another element, it can be directly on the other element, or there may be intervening elements. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements. In addition, in this specification, the words "on..." or "over..." mean disposed on or over an object part, but do not necessarily mean disposed on the upper side of the object part based on the direction of gravity.

[0040] In addition, unless explicitly described to the contrary, the word “comprise” and variations such as “comprises” and “comprising” will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0041] Furthermore, throughout the specification, the phrase “in a plan view” or “on a plane” means observing a target portion from the top, and the phrase “in a cross-sectional view” or “on a cross section” means observing a cross section formed by vertically cutting the target portion from the side.

[0042] Furthermore, throughout the specification, “connected” does not only mean when two or more elements are directly connected, but also means when two or more elements are indirectly connected through other elements and when they are physically connected or electrically connected, and further, it may be referred to by different names depending on position or function, and may also be referred to as a case where substantially integrated parts are linked to each other.

[0043] Hereinafter, various embodiments and modifications will be described in detail with reference to the accompanying drawings.

[0044] Reference Figure 1 A dry electrode manufacturing apparatus and a dry electrode manufacturing method according to an embodiment are schematically described. Figure 1 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to an embodiment.

[0045] The manufacturing method of the dry electrode may be a method for manufacturing a dry electrode for a rechargeable battery, but the present disclosure is not limited thereto, and the manufacturing method of the dry electrode may be a method for manufacturing various known dry electrodes. Each of the fiberizing device (or fiberizing device), the grinding device, the calendering device, and the laminating device used in the manufacturing method of the dry electrode according to the embodiment may include various known devices.

[0046] refer to Figure 1 , according to the embodiment, the dry electrode manufacturing equipment may include a powder supply part or a fine powder supply part PMS for supplying powder or fine powder PM for an electrode and a plurality of rollers RL1, RL2, RL3 and RL4 for calendering and stretching the supplied fine powder PM. The first roller RL1 and the second roller RL2 among the plurality of rollers RL1, RL2, RL3 and RL4 may calender the supplied fine powder PM. The second roller RL2, the third roller RL3 and the fourth roller RL4 among the plurality of rollers RL1, RL2, RL3 and RL4 may stretch the calendered electrode film PLT to form a thin and uniform electrode film (ie, dry electrode film) PLT. The embodiment is not limited to the depicted configuration, for example, the number of rollers for stretching among the plurality of rollers RL1, RL2, RL3 and RL4 may be changed.

[0047] The first roller RL1 may have a first rotation speed RD1 and may rotate in a first rotation direction (e.g., clockwise). The second roller RL2 may have a second rotation speed RD2 and may rotate in a second rotation direction (e.g., counterclockwise) opposite to the first rotation direction. The diameter of the first roller RL1 and the diameter of the second roller RL2 may be similar or the same. However, the embodiment is not limited thereto. The second rotation speed RD2 of the second roller RL2 may be greater than the first rotation speed RD1 of the first roller RL1. However, the embodiment is not limited thereto.

[0048] When the fine powder PM is supplied from the fine powder supply part PMS between the first roller RL1 and the second roller RL2, the first roller RL1 and the second roller RL2 can rotate in a first rotation direction and a second rotation direction which are different directions, so that the supplied fine powder PM is rolled to form an electrode film (or a film for an electrode) PLT having a film shape.

[0049] The active material, the conductive material, and the binder may be mixed using various known mixing devices to produce a mixture, the mixture may be fiberized using various known fiberizing devices, and then the fiberized dry powder may be pulverized to supply fine powder PM.

[0050] The electrode film PLT passing between the first roll RL1 and the second roll RL2 may be stretched while sequentially passing through the second roll RL2 , the third roll RL3 , and the fourth roll RL4 . The number of stretching rolls RL3 and RL4 may be changed, and may include at least two rolls.

[0051] Because the second rotation speed RD2 of the second roller RL2 is greater than the first rotation speed RD1 of the first roller RL1, the linear speed in the second rotation direction can be greater than the linear speed in the first rotation direction, and the electrode film PLT passing between the first roller RL1 and the second roller RL2 can be transferred toward the second roller RL2 having a higher linear speed than the first roller RL1.

[0052] The third roller RL3 may have a third rotation speed RD3 and may rotate in a third rotation direction opposite to the second rotation direction. The fourth roller RL4 may have a fourth rotation speed RD4 and may rotate in a fourth rotation direction opposite to the third rotation direction. The diameter of the third roller RL3 and the diameter of the fourth roller RL4 may be similar or the same. However, the embodiment is not limited thereto. The diameter of the third roller RL3 and the diameter of the fourth roller RL4 may be similar or the same as the diameter of the first roller RL1 and the diameter of the second roller RL2. However, the embodiment is not limited thereto.

[0053] The third rotation speed RD3 of the third roller RL3 may be greater than the second rotation speed RD2 of the second roller RL2. The fourth rotation speed RD4 of the fourth roller RL4 may be greater than the third rotation speed RD3 of the third roller RL3. Because the third rotation speed RD3 of the third roller RL3 is greater than the second rotation speed RD2 of the second roller RL2, the linear velocity in the third rotation direction may be greater than the linear velocity in the second rotation direction, and the electrode film PLT passing between the second roller RL2 and the third roller RL3 may be transferred toward the third roller RL3 having a higher linear velocity than that of the second roller RL2. Similarly, because the fourth rotation speed RD4 of the fourth roller RL4 is greater than the third rotation speed RD3 of the third roller RL3, the linear velocity in the fourth rotation direction may be greater than the linear velocity in the third rotation direction, and the electrode film PLT passing between the third roller RL3 and the fourth roller RL4 may be transferred toward the fourth roller RL4 having a higher linear velocity than that of the third roller RL3.

[0054] The fine powder PM passed between the first roller RL1 and the second roller RL2 can be calendered to form an electrode film PLT having a film shape. The calendered electrode film PLT can be automatically transferred, extruded and stretched while passing through the second roller RL2, the third roller RL3 and the fourth roller RL4. Because the electrode film PLT is automatically transferred to the second roller RL2, the third roller RL3 and the fourth roller RL4 in sequence, extruded and stretched, the electrode film PLT may not be stretched in a state in which the electrode film PLT is subsequently stretched. Therefore, cracks or defects in the self-supporting electrode film PLT that may occur during the stretching process performed in a state in which the self-supporting electrode film PLT is extended can be reduced, and the rupture of the self-supporting electrode film PLT can be prevented during the subsequent lamination process. In addition, by stretching the electrode film PLT using multiple stretching rollers, the active material particles in the electrode film PLT can be effectively rearranged, and defects such as breakage of the active material can be prevented without increasing the binder content.

[0055] Reference Figure 2 A dry electrode manufacturing apparatus and a dry electrode manufacturing method according to other embodiments are described. Figure 2 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to other embodiments.

[0056] refer to Figure 2 The dry electrode manufacturing apparatus according to this embodiment is different from the dry electrode manufacturing apparatus according to the reference Figure 1 The dry electrode manufacturing apparatus of the described embodiments are similar. Therefore, detailed description of the same parts will be omitted.

[0057] like Figure 2As shown in , the dry electrode manufacturing equipment according to the present embodiment may include a powder supply part or a fine powder supply part PMS for supplying powder or fine powder PM for an electrode and a plurality of rollers RL1, RL2, RL3 and RL4 for calendering and stretching the supplied fine powder PM. The first roller RL1 and the second roller RL2 among the plurality of rollers RL1, RL2, RL3 and RL4 can calender the supplied fine powder PM to form a calendered electrode film PLT. The second roller RL2, the third roller RL3 and the fourth roller RL4 among the plurality of rollers RL1, RL2, RL3 and RL4 can stretch the calendered electrode film PLT to form a thin and uniform electrode film (ie, a dry electrode film) PLT. However, the present disclosure is not limited to the depicted configuration, and the number of rollers for stretching among the plurality of rollers RL1, RL2, RL3 and RL4 can be changed.

[0058] The first roller RL1 may have a first rotation speed RD1 and may rotate in a first rotation direction (e.g., clockwise). The second roller RL2 may have a second rotation speed RD2 and may rotate in a second rotation direction (e.g., counterclockwise) opposite to the first rotation direction. The third roller RL3 may have a third rotation speed RD3 and may rotate in a third rotation direction opposite to the second rotation direction. The fourth roller RL4 may have a fourth rotation speed RD4 and may rotate in a fourth rotation direction opposite to the third rotation direction.

[0059] The diameter of the first roller RL1 and the diameter of the second roller RL2 may be similar or the same. The diameter of the third roller RL3 and the diameter of the fourth roller RL4 may be similar or the same. The diameter of the third roller RL3 and the diameter of the fourth roller RL4 may be similar or the same as the diameter of the first roller RL1 and the diameter of the second roller RL2. However, the embodiment is not limited thereto.

[0060] The first rotation speed RD1 of the first roller RL1 of the dry electrode manufacturing apparatus according to the present embodiment may be similar to or the same as the second rotation speed RD2 of the second roller RL2. The third rotation speed RD3 of the third roller RL3 may be similar to or the same as the second rotation speed RD2 of the second roller RL2. The fourth rotation speed RD4 of the fourth roller RL4 may be similar to or the same as the third rotation speed RD3 of the third roller RL3. However, the embodiment is not limited thereto.

[0061] According to Figure 1Unlike the dry electrode manufacturing equipment of the embodiment of the present invention, in the present embodiment, the surface roughness of the second roller RL2 of the dry electrode manufacturing equipment may be greater than the surface roughness of the first roller RL1. For example, the first protrusion ST1 may be provided on the surface of the second roller RL2, but such a protrusion may not be formed on the surface of the first roller RL1. The surface roughness of the third roller RL3 may be greater than the surface roughness of the second roller RL2, and the surface roughness of the fourth roller RL4 may be greater than the surface roughness of the third roller RL3. For example, the second protrusion ST2 may be provided on the surface of the third roller RL3, the third protrusion ST3 may be provided on the surface of the fourth roller RL4, the width and height of the second protrusion ST2 are greater than the width and height of the first protrusion ST1, and the width and height of the third protrusion ST3 are greater than the width and height of the second protrusion ST2.

[0062] When the fine powder PM is supplied from the fine powder supply part PMS between the first roller RL1 and the second roller RL2, the first roller RL1 and the second roller RL2 can rotate in a first rotation direction and a second rotation direction (which are different directions), so that the supplied fine powder PM is rolled to form a film-shaped electrode film (or a film for an electrode) PLT.

[0063] The electrode film PLT passing between the first roll RL1 and the second roll RL2 may be stretched while sequentially passing through the second roll RL2 , the third roll RL3 , and the fourth roll RL4 .

[0064] Since the surface roughness of the second roller RL2 is greater than that of the first roller RL1, the adhesion between the electrode film PLT and the second roller RL2 may be greater than the adhesion between the electrode film PLT and the first roller RL1. Therefore, the electrode film PLT passing between the first roller RL1 and the second roller RL2 may be transferred toward the second roller RL2 having a greater adhesion than that of the first roller RL1.

[0065] Because the surface roughness of the third roller RL3 is greater than that of the second roller RL2, the adhesion between the electrode film PLT and the third roller RL3 may be greater than that between the electrode film PLT and the second roller RL2, and the electrode film PLT passing between the second roller RL2 and the third roller RL3 may be transferred toward the third roller RL3 having an adhesion greater than that of the second roller RL2. Similarly, because the surface roughness of the fourth roller RL4 is greater than that of the third roller RL3, the adhesion between the electrode film PLT and the fourth roller RL4 may be greater than that between the electrode film PLT and the third roller RL3, and the electrode film PLT passing between the third roller RL3 and the fourth roller RL4 may be transferred toward the fourth roller RL4 having an adhesion greater than that of the third roller RL3.

[0066] The fine powder PM passed between the first roller RL1 and the second roller RL2 may be calendered to form an electrode film PLT having a film shape, and the calendered electrode film PLT may be automatically transferred, extruded, and stretched while passing through the second roller RL2, the third roller RL3, and the fourth roller RL4. Because the electrode film PLT is automatically sequentially transferred to the second roller RL2, the third roller RL3, and the fourth roller RL4, extruded, and stretched, the electrode film PLT may not be stretched in a state where the electrode film PLT is subsequently stretched. Therefore, cracks or defects in the self-supporting electrode film PLT that may occur during the stretching process performed in a state where the self-supporting electrode film PLT is extended may be prevented or reduced, and rupture of the self-supporting electrode film PLT may be prevented during a subsequent lamination process.

[0067] According to other embodiments, as according to reference Figure 1 In the dry electrode manufacturing apparatus of the described embodiment, the second rotation speed RD2 of the second roller RL2 may be greater than the first rotation speed RD1 of the first roller RL1, the third rotation speed RD3 of the third roller RL3 may be greater than the second rotation speed RD2 of the second roller RL2, and the fourth rotation speed RD4 of the fourth roller RL4 may be greater than the third rotation speed RD3 of the third roller RL3. Therefore, the electrode film PLT passing between the first roller RL1 and the second roller RL2 may be transferred toward the second roller RL2 having a higher line speed than the line speed of the first roller RL1 and a greater adhesion force than the adhesion force of the first roller RL1, the electrode film PLT passing between the second roller RL2 and the third roller RL3 may be transferred toward the third roller RL3 having a higher line speed than the line speed of the second roller RL2 and a greater adhesion force than the adhesion force of the second roller RL2, and the electrode film PLT passing between the third roller RL3 and the fourth roller RL4 may be transferred toward the fourth roller RL4 having a higher line speed than the line speed of the third roller RL3 and a greater adhesion force than the adhesion force of the third roller RL3.

[0068] Reference above Figure 1 Many features of the dry electrode manufacturing apparatus according to the described embodiment are applicable to the dry electrode manufacturing apparatus according to the present embodiment.

[0069] Reference Figure 3 A dry electrode manufacturing apparatus and a dry electrode manufacturing method according to other embodiments are described. Figure 3 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to other embodiments.

[0070] refer to Figure 3 The dry electrode manufacturing apparatus according to this embodiment is different from the dry electrode manufacturing apparatus according to the reference Figure 1 The dry electrode manufacturing apparatus of the described embodiments is similar. Therefore, detailed description of the same parts is omitted.

[0071] like Figure 3 As shown in , the dry electrode manufacturing apparatus according to the present embodiment may include a powder supplying portion or a fine powder supplying portion PMS for supplying powder or fine powder PM for an electrode and a plurality of rollers RL1, RL21, RL31 and RL41 for rolling and stretching the supplied fine powder PM.

[0072] The first roller RL1 and the second roller RL21 among the plurality of rollers may calender the supplied fine powder PM. The second roller RL21, the third roller RL31, and the fourth roller RL41 among the plurality of rollers may stretch the calendered electrode film PLT to form a thin and uniform electrode film (i.e., dry electrode film) PLT. The embodiment is not limited, for example, the number of rollers for stretching among the plurality of rollers RL1, RL21, RL31, and RL41 may be changed.

[0073] The first roller RL1 may have a first rotation speed RD1 and may rotate in a first rotation direction (e.g., clockwise). The second roller RL21 may have a second rotation speed RD21 and may rotate in a second rotation direction (e.g., counterclockwise) opposite to the first rotation direction. The third roller RL31 may have a third rotation speed RD31 and may rotate in a third rotation direction opposite to the second rotation direction. The fourth roller RL41 may have a fourth rotation speed RD41 and may rotate in a fourth rotation direction opposite to the third rotation direction.

[0074] Unlike the dry electrode manufacturing apparatus according to the above-described embodiment, the diameter of the second roll RL21 of the dry electrode manufacturing apparatus according to the present embodiment may be greater than the diameter of the first roll RL1, the diameter of the third roll RL31 may be greater than the diameter of the second roll RL21, and the diameter of the fourth roll RL41 may be greater than the diameter of the third roll RL31. However, the embodiment is not limited thereto.

[0075] The first rotation speed RD1 of the first roll RL1 may be similar to or the same as the second rotation speed RD21 of the second roll RL21. The third rotation speed RD31 of the third roll RL31 may be similar to or the same as the second rotation speed RD21 of the second roll RL21. The fourth rotation speed RD41 of the fourth roll RL41 may be similar to or the same as the third rotation speed RD31 of the third roll RL31. However, the embodiment is not limited thereto.

[0076] When the fine powder PM is supplied between the first roller RL1 and the second roller RL21 from the fine powder supply part PMS, the first roller RL1 and the second roller RL21 may rotate in a first rotation direction and a second rotation direction (which are different) so that the supplied fine powder PM is rolled to form an electrode film (or a film for an electrode) PLT having a film shape. The electrode film PLT passing between the first roller RL1 and the second roller RL21 may be stretched while sequentially passing through the second roller RL21, the third roller RL31, and the fourth roller RL41.

[0077] Since the diameter of the second roller RL21 is larger than that of the first roller RL1, the linear velocity of the second roller RL21 in the second rotation direction may be greater than the linear velocity of the first roller RL1 in the first rotation direction. Therefore, the electrode film PLT passing between the first roller RL1 and the second roller RL21 may be transferred toward the second roller RL21 having a higher linear velocity than that of the first roller RL1.

[0078] Since the diameter of the third roller RL31 is larger than that of the second roller RL21, the electrode film PLT passing between the second roller RL21 and the third roller RL31 can be transferred toward the third roller RL31 having a higher linear speed than that of the second roller RL21. Similarly, since the diameter of the fourth roller RL41 is larger than that of the third roller RL31, the electrode film PLT passing between the third roller RL31 and the fourth roller RL41 can be transferred toward the fourth roller RL41 having a higher linear speed than that of the third roller RL31.

[0079] The fine powder PM passed between the first roller RL1 and the second roller RL21 may be calendered to form an electrode film PLT having a film shape. The calendered electrode film PLT may be automatically transferred, extruded, and stretched while passing through the second roller RL21, the third roller RL31, and the fourth roller RL41. Because the electrode film PLT is automatically sequentially transferred to the second roller RL21, the third roller RL31, and the fourth roller RL41, extruded, and stretched, the electrode film PLT may not be stretched in a state where the electrode film PLT is subsequently elongated. Therefore, cracks or defects formed in the self-supporting electrode film PLT that may occur during the stretching process performed in a state where the self-supporting electrode film PLT is extended may be prevented or reduced, and the rupture of the self-supporting electrode film PLT may be prevented during a subsequent lamination process.

[0080] According to this embodiment, as according to reference Figure 1In the dry electrode manufacturing equipment of the described embodiment, the second rotation speed RD21 of the second roller RL21 can be greater than the first rotation speed RD1 of the first roller RL1, the third rotation speed RD31 of the third roller RL31 can be greater than the second rotation speed RD21 of the second roller RL21, and the fourth rotation speed RD41 of the fourth roller RL41 can be greater than the third rotation speed RD31 of the third roller RL31.

[0081] The linear speed of the second roller RL21 in the second rotation direction may be greater than the linear speed of the first roller RL1 in the first rotation direction. The linear speed of the third roller RL31 in the third rotation direction may be greater than the linear speed of the second roller RL21 in the second rotation direction. The linear speed of the fourth roller RL41 in the fourth rotation direction may be greater than the linear speed of the third roller RL31 in the third rotation direction. Therefore, the electrode film PLT passing between the first roller RL1 and the second roller RL21 may be transferred toward the second roller RL21 having a higher linear speed than the first roller RL1, the electrode film PLT passing between the second roller RL21 and the third roller RL31 may be transferred toward the third roller RL31 having a higher linear speed than the second roller RL21, and the electrode film PLT passing between the third roller RL31 and the fourth roller RL41 may be transferred toward the fourth roller RL41 having a higher linear speed than the third roller RL31.

[0082] According to the above reference Figure 1 and Figure 2 Many features of the dry electrode manufacturing apparatus of the described embodiment are applicable to the present embodiment.

[0083] Reference Figure 4 A dry electrode manufacturing apparatus and a dry electrode manufacturing method according to other embodiments are described. Figure 4 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to other embodiments.

[0084] refer to Figure 4 The dry electrode manufacturing apparatus according to this embodiment is different from the dry electrode manufacturing apparatus according to the reference Figure 1 The dry electrode manufacturing apparatus of the described embodiments is similar. Therefore, detailed description of the same parts is omitted.

[0085] like Figure 4 As shown in , the dry electrode manufacturing apparatus according to the present embodiment may include a powder supplying portion or a fine powder supplying portion PMS for supplying powder or fine powder PM for an electrode and a plurality of rollers RL1, RL2, RL3 and RL4 for rolling and stretching the supplied fine powder PM.

[0086] The dry electrode manufacturing apparatus according to the present embodiment may further include a fifth roll RL5 contacting the first roll RL1 .

[0087] The first roller RL1 and the second roller RL2 among the plurality of rollers may calender the supplied fine powder PM, and the second roller RL2, the third roller RL3, and the fourth roller RL4 among the plurality of rollers may stretch the calendered electrode film PLT to form a thin and uniform electrode film (i.e., dry electrode film) PLT. The embodiment is not limited, for example, the number of rollers for stretching among the plurality of rollers RL1, RL2, RL3, RL4, and RL5 may be changed.

[0088] The first roller RL1 may have a first rotation speed RD1 and may rotate in a first rotation direction (e.g., clockwise). The second roller RL2 may have a second rotation speed RD2 and may rotate in a second rotation direction (e.g., counterclockwise) opposite to the first rotation direction. The third roller RL3 may have a third rotation speed RD3 and may rotate in a third rotation direction opposite to the second rotation direction. The fourth roller RL4 may have a fourth rotation speed RD4 and may rotate in a fourth rotation direction opposite to the third rotation direction.

[0089] The second rotation speed RD2 of the second roll RL2 may be greater than the first rotation speed RD1 of the first roll RL1. The third rotation speed RD3 of the third roll RL3 may be greater than the second rotation speed RD2 of the second roll RL2. The fourth rotation speed RD4 of the fourth roll RL4 may be greater than the third rotation speed RD3 of the third roll RL3.

[0090] The fifth roll RL5 may have a fifth rotation speed RD5 , and may rotate in a direction opposite to the first rotation direction of the first roll RL1 .

[0091] When fine powder PM is supplied between the first roller RL1 and the second roller RL2 from the fine powder supply part PMS, the first roller RL1 and the second roller RL2 can rotate in the first rotation direction and the second rotation direction (which are different) so that the supplied fine powder PM is rolled to form an electrode film (or a film for an electrode) PLT having a film shape. The fifth roller RL5 contacts the first roller RL1 to rotate in a rotation direction opposite to the first rotation direction of the first roller RL1, and together with the third roller RL3 adjacent to the second roller RL2, applies pressure toward the first roller RL1 and the second roller RL2 while the first roller RL1 and the second roller RL2 are supported. Therefore, the pressure between the first roller RL1 and the second roller RL2 for rolling can be increased, and even when the fine powder PM is supplied between the first roller RL1 and the second roller RL2, the first roller RL1 and the second roller RL2 can be prevented from being pushed, so that the active material particles within the electrode film PLT formed by rolling are uniformly arranged in the electrode film PLT.

[0092] The electrode film PLT passing between the first roll RL1 and the second roll RL2 may be stretched while sequentially passing through the second roll RL2 , the third roll RL3 , and the fourth roll RL4 .

[0093] The linear speed of the second roller RL2 in the second rotation direction may even be greater than the linear speed of the first roller RL1 in the first rotation direction. The linear speed of the third roller RL3 in the third rotation direction may even be greater than the linear speed of the second roller RL2 in the second rotation direction. The linear speed of the fourth roller RL4 in the fourth rotation direction may even be greater than the linear speed of the third roller RL3 in the third rotation direction. Therefore, the electrode film PLT passing between the first roller RL1 and the second roller RL2 may be transferred toward the second roller RL2 having a higher linear speed than the first roller RL1, the electrode film PLT passing between the second roller RL2 and the third roller RL3 may be transferred toward the third roller RL3 having a higher linear speed than the second roller RL2, and the electrode film PLT passing between the third roller RL3 and the fourth roller RL4 may be transferred toward the fourth roller RL4 having a higher linear speed than the third roller RL3.

[0094] The fine powder PM passed between the first roller RL1 and the second roller RL2 may be calendered to form an electrode film PLT having a film shape. The calendered electrode film PLT may be automatically transferred, extruded, and stretched while passing through the second roller RL2, the third roller RL3, and the fourth roller RL4. Therefore, the electrode film PLT may not be stretched in a state where the electrode film PLT is stretched. Therefore, cracks or defects formed in the self-supporting electrode film PLT that may occur during the stretching process performed in a state where the self-supporting electrode film PLT is extended may be prevented or reduced, and the rupture of the self-supporting electrode film PLT may be prevented during a subsequent lamination process.

[0095] According to the above reference Figures 1 to 3 Many features of the dry electrode manufacturing apparatus of the described embodiment are applicable to the present embodiment.

[0096] Reference Figure 5 A dry electrode manufacturing apparatus and a dry electrode manufacturing method according to other embodiments are described. Figure 5 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to other embodiments.

[0097] refer to Figure 5 The dry electrode manufacturing apparatus according to this embodiment is different from the dry electrode manufacturing apparatus according to the reference Figure 3 The dry electrode manufacturing apparatus of the described embodiments is similar. Therefore, detailed description of the same parts is omitted.

[0098] like Figure 5As shown in , the dry electrode manufacturing apparatus according to the present embodiment may include a powder supplying portion or a fine powder supplying portion PMS for supplying powder or fine powder PM for an electrode and a plurality of rollers RL1, RL21, RL31 and RL41 for rolling and stretching the supplied fine powder PM.

[0099] The dry electrode manufacturing apparatus according to the present embodiment may further include a fifth roll RL5 contacting the first roll RL1 .

[0100] The first roller RL1 and the second roller RL21 among the plurality of rollers may calender the supplied fine powder PM, and the second roller RL21, the third roller RL31, and the fourth roller RL41 among the plurality of rollers may stretch the calendered electrode film PLT to form a thin and uniform electrode film (i.e., dry electrode film) PLT. The embodiment is not limited, for example, the number of rollers for stretching among the plurality of rollers RL1, RL21, RL31, RL41, and RL5 may be changed.

[0101] The first roller RL1 may have a first rotation speed RD1 and may rotate in a first rotation direction (e.g., clockwise). The second roller RL21 may have a second rotation speed RD21 and may rotate in a second rotation direction (e.g., counterclockwise) opposite to the first rotation direction. The third roller RL31 may have a third rotation speed RD31 and may rotate in a third rotation direction opposite to the second rotation direction. The fourth roller RL41 may have a fourth rotation speed RD41 and may rotate in a fourth rotation direction opposite to the third rotation direction. The fifth roller RL5 may have a fifth rotation speed RD5 and may rotate in a direction opposite to the first rotation direction of the first roller RL1.

[0102] The diameter of the second roll RL21 may be greater than that of the first roll RL1. The diameter of the third roll RL31 may be greater than that of the second roll RL21. The diameter of the fourth roll RL41 may be greater than that of the third roll RL31. However, the embodiment is not limited thereto.

[0103] The first rotation speed RD1 of the first roll RL1 may be similar to or the same as the second rotation speed RD21 of the second roll RL21. The third rotation speed RD31 of the third roll RL31 may be similar to or the same as the second rotation speed RD21 of the second roll RL21. The fourth rotation speed RD41 of the fourth roll RL41 may be similar to or the same as the third rotation speed RD31 of the third roll RL31. However, the embodiment is not limited thereto.

[0104] When the fine powder PM is supplied between the first roller RL1 and the second roller RL21 from the fine powder supply part PMS, the first roller RL1 and the second roller RL21 can rotate in the first rotation direction and the second rotation direction (which are different directions) so that the supplied fine powder PM is rolled to form an electrode film (or a film for an electrode) PLT having a film shape. The fifth roller RL5 contacts the first roller RL1 to rotate in a rotation direction opposite to the first rotation direction of the first roller RL1, and together with the third roller RL31 adjacent to the second roller RL21, applies pressure toward the first roller RL1 and the second roller RL21 while the first roller RL1 and the second roller RL21 are supported. Therefore, the pressure between the first roller RL1 and the second roller RL21 for rolling can be increased, and even if the fine powder PM is supplied between the first roller RL1 and the second roller RL21, the first roller RL1 and the second roller RL21 can be prevented from being pushed, so that the active material particles in the electrode film PLT formed by rolling are uniformly arranged.

[0105] The electrode film PLT passing between the first roll RL1 and the second roll RL21 may be stretched while sequentially passing through the second roll RL21 , the third roll RL31 , and the fourth roll RL41 .

[0106] Because the diameter of the second roller RL21 is larger than the diameter of the first roller RL1, the linear speed of the second roller RL21 in the second rotation direction can be larger than the linear speed of the first roller RL1 in the first rotation direction. Therefore, the electrode film PLT passing between the first roller RL1 and the second roller RL21 can be transferred toward the second roller RL21 having a higher linear speed than the linear speed of the first roller RL1. Because the diameter of the third roller RL31 is larger than the diameter of the second roller RL21, the electrode film PLT passing between the second roller RL21 and the third roller RL31 can be transferred toward the third roller RL31 having a higher linear speed than the linear speed of the second roller RL21. Similarly, because the diameter of the fourth roller RL41 is larger than the diameter of the third roller RL31, the electrode film PLT passing between the third roller RL31 and the fourth roller RL41 can be transferred toward the fourth roller RL41 having a higher linear speed than the linear speed of the third roller RL31.

[0107] The fine powder PM passed between the first roller RL1 and the second roller RL21 may be calendered to form an electrode film PLT having a film shape. The calendered electrode film PLT may be automatically transferred, extruded, and stretched while passing through the second roller RL21, the third roller RL31, and the fourth roller RL41. Because the electrode film PLT is automatically sequentially transferred to the second roller RL21, the third roller RL31, and the fourth roller RL41, extruded, and stretched, the electrode film PLT may not be stretched in a state where the electrode film PLT is subsequently elongated. Therefore, cracks or defects formed in the self-supporting electrode film PLT that may occur during the stretching process performed in a state where the self-supporting electrode film PLT is extended may be reduced, and rupture of the self-supporting electrode film PLT may be prevented during a subsequent lamination process.

[0108] According to other embodiments, as according to reference Figure 1 In the dry electrode manufacturing apparatus of the described embodiment, the second rotation speed RD21 of the second roller RL21 may be greater than the first rotation speed RD1 of the first roller RL1, the third rotation speed RD31 of the third roller RL31 may be greater than the second rotation speed RD21 of the second roller RL21, and the fourth rotation speed RD41 of the fourth roller RL41 may be greater than the third rotation speed RD31 of the third roller RL31. The linear speed of the second roller RL21 in the second rotation direction may even be greater than the linear speed of the first roller RL1 in the first rotation direction, the linear speed of the third roller RL31 in the third rotation direction may even be greater than the linear speed of the second roller RL21 in the second rotation direction, and the linear speed of the fourth roller RL41 in the fourth rotation direction may even be greater than the linear speed of the third roller RL31 in the third rotation direction. Therefore, the electrode film PLT passing between the first roller RL1 and the second roller RL21 can be transferred toward the second roller RL21 having a higher linear speed than the first roller RL1, the electrode film PLT passing between the second roller RL21 and the third roller RL31 can be transferred toward the third roller RL31 having a higher linear speed than the second roller RL21, and the electrode film PLT passing between the third roller RL31 and the fourth roller RL41 can be transferred toward the fourth roller RL41 having a higher linear speed than the third roller RL31.

[0109] The fine powder PM passed between the first roller RL1 and the second roller RL21 may be calendered to form an electrode film PLT having a film shape. The calendered electrode film PLT may be automatically transferred, extruded, and stretched while passing through the second roller RL21, the third roller RL31, and the fourth roller RL41. Because the electrode film PLT is automatically sequentially transferred to the second roller RL21, the third roller RL31, and the fourth roller RL41, extruded, and stretched, the electrode film PLT may not be stretched in a state where the electrode film PLT is subsequently elongated. Therefore, cracks or defects within the self-supporting electrode film PLT that may occur during the stretching process performed in a state where the self-supporting electrode film PLT is extended may be reduced, and rupture of the self-supporting electrode film PLT may be prevented during a subsequent lamination process.

[0110] According to the above reference Figures 1 to 4 Many features of the dry electrode manufacturing apparatus of the described embodiment are applicable to the present embodiment.

[0111] Reference Figure 6 A dry electrode manufacturing apparatus and a dry electrode manufacturing method according to other embodiments are described. Figure 6 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to other embodiments.

[0112] refer to Figure 6 The dry electrode manufacturing apparatus according to this embodiment is different from the dry electrode manufacturing apparatus according to the reference Figure 4 and Figure 5 The dry electrode manufacturing apparatus of the described embodiments is similar, and detailed description of the same parts is omitted.

[0113] like Figure 6 As shown in , the dry electrode manufacturing apparatus according to the present embodiment may include a powder supply part or a fine powder supply part PMS for supplying powder or fine powder PM for an electrode and a plurality of rollers RL1, RL2, RL32 and RL4 for rolling and stretching the supplied fine powder PM. The dry electrode manufacturing apparatus according to the present embodiment may include a fifth roller RL51 in contact with the first roller RL1.

[0114] The first roller RL1 and the second roller RL2 among the plurality of rollers may calender the supplied fine powder PM. The second roller RL2, the third roller RL32, and the fourth roller RL4 among the plurality of rollers may stretch the calendered electrode film PLT to form a thin and uniform electrode film (ie, dry electrode film) PLT. The embodiment is not limited thereto, and the number of rollers for stretching among the plurality of rollers may vary.

[0115] The first roller RL1 may have a first rotation speed RD1 and may rotate in a first rotation direction (e.g., clockwise), and the second roller RL2 may have a second rotation speed RD2 and may rotate in a second rotation direction (e.g., counterclockwise) opposite to the first rotation direction. The third roller RL32 may have a third rotation speed RD32 and may rotate in a third rotation direction opposite to the second rotation direction, and the fourth roller RL4 may have a fourth rotation speed RD4 and may rotate in a fourth rotation direction opposite to the third rotation direction. The fifth roller RL51 may have a fifth rotation speed RD51 and may rotate in a direction opposite to the first rotation direction of the first roller RL1.

[0116] The diameter of the second roller RL2 may be similar to or the same as the diameter of the first roller RL1. The diameter of the third roller RL32 may be greater than the diameter of the second roller RL2, the diameter of the fourth roller RL4 may be almost the same as the diameter of the first roller RL1 and the diameter of the second roller RL2, and the diameter of the fifth roller RL51 may be greater than the diameter of the first roller RL1. However, the embodiment is not limited thereto.

[0117] The second rotation speed RD2 of the second roll RL2 may be greater than the first rotation speed RD1 of the first roll RL1. The third rotation speed RD32 of the third roll RL32 may be similar to or the same as the second rotation speed RD2 of the second roll RL2. The fourth rotation speed RD4 of the fourth roll RL4 may be greater than the third rotation speed RD32 of the third roll RL32. However, the embodiment is not limited thereto.

[0118] When the fine powder PM is supplied between the first roller RL1 and the second roller RL2 from the fine powder supply part PMS, the first roller RL1 and the second roller RL2 may rotate in different first and second rotation directions, so that the supplied fine powder PM is rolled to form an electrode film (or a film for an electrode) PLT having a film shape. The fifth roller RL51 that contacts the first roller RL1 to rotate in a rotation direction opposite to the first rotation direction of the first roller RL1 may apply pressure toward the first roller RL1 and the second roller RL2 together with the third roller RL32 adjacent to the second roller RL2 while the first roller RL1 and the second roller RL2 are supported. Therefore, the pressure between the first roller RL1 and the second roller RL2 for rolling can be increased. And even if the fine powder PM is supplied between the first roller RL1 and the second roller RL2, the first roller RL1 and the second roller RL2 can be prevented from being pushed, so that the active material particles in the electrode film PLT formed by rolling are uniformly arranged. Because the diameters of the fifth roller RL51 and the third roller RL32, which support the first roller RL1 and the second roller RL2 while applying pressure toward the first roller RL1 and the second roller RL2, are greater than the diameters of the first roller RL1 and the second roller RL2, the fifth roller RL51 and the third roller RL32 can support the first roller RL1 and the second roller RL2 and can apply pressure toward the first roller RL1 and the second roller RL2.

[0119] The electrode film PLT passing between the first roll RL1 and the second roll RL21 may be stretched while sequentially passing through the second roll RL2 , the third roll RL32 , and the fourth roll RL4 .

[0120] The second rotation speed RD2 of the second roller RL2 may be greater than the first rotation speed RD1 of the first roller RL1, so that the linear speed of the second roller RL2 in the second rotation direction is greater than the linear speed of the first roller RL1 in the first rotation direction. Therefore, the electrode film PLT passing between the first roller RL1 and the second roller RL2 may be transferred toward the second roller RL2 having a higher linear speed than the linear speed of the first roller RL1.

[0121] The third rotation speed RD32 of the third roller RL32 may be similar to or the same as the second rotation speed RD2 of the second roller RL2. However, the diameter of the third roller RL32 may be greater than the diameter of the second roller RL2, so that the linear speed of the third roller RL32 in the third rotation direction is greater than the linear speed of the second roller RL2 in the second rotation direction. Therefore, the electrode film PLT passing between the second roller RL2 and the third roller RL32 may be transferred toward the third roller RL32 having a higher linear speed than the linear speed of the second roller RL2.

[0122] The fourth rotation speed RD4 of the fourth roller RL4 may be greater than the third rotation speed RD32 of the third roller RL32, and the linear speed of the third roller RL32 in the third rotation direction may be greater than the linear speed of the fourth roller RL4 in the fourth rotation direction. Therefore, the electrode film PLT passing between the third roller RL32 and the fourth roller RL4 may be transferred toward the fourth roller RL4 having a higher linear speed than the linear speed of the third roller RL32.

[0123] The fine powder PM passed between the first roller RL1 and the second roller RL2 may be calendered to form an electrode film PLT having a film shape. The calendered electrode film PLT may be automatically transferred, extruded, and stretched while passing through the second roller RL2, the third roller RL32, and the fourth roller RL4. Because the electrode film PLT is automatically sequentially transferred to the second roller RL2, the third roller RL32, and the fourth roller RL4, extruded, and stretched, the electrode film PLT may not be stretched in a state where the electrode film PLT is subsequently stretched. Therefore, cracks or defects within the self-supporting electrode film PLT that may occur during the stretching process performed in a state where the self-supporting electrode film PLT is extended may be reduced, and rupture of the self-supporting electrode film PLT may be prevented during a subsequent lamination process.

[0124] According to the above reference Figures 1 to 5 Many features of the dry electrode manufacturing apparatus of the described embodiment are applicable to the present embodiment.

[0125] Reference Figure 7 A dry electrode manufacturing apparatus and a dry electrode manufacturing method according to other embodiments are described. Figure 7 2 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to other embodiments.

[0126] refer to Figure 7 The dry electrode manufacturing apparatus according to this embodiment is different from the dry electrode manufacturing apparatus according to the reference Figure 1 The dry electrode manufacturing apparatus of the described embodiments is similar, and detailed description of the same parts is omitted.

[0127] like Figure 7 As shown in , the dry electrode manufacturing apparatus according to the present embodiment may include a powder supplying portion or a fine powder supplying portion PMS for supplying powder or fine powder PM for an electrode and a plurality of rollers RL11 , RL22 , RL3 and RL4 for rolling and stretching the supplied fine powder PM.

[0128] The first roller RL11 and the second roller RL22 among the plurality of rollers may calender the supplied fine powder PM. The second roller RL22, the third roller RL3, and the fourth roller RL4 among the plurality of rollers may stretch the calendered electrode film PLT to form a thin and uniform electrode film (ie, dry electrode film) PLT. The embodiment is not limited thereto, and the number of rollers for stretching among the plurality of rollers may vary.

[0129] The first roller RL11 may have a first rotation speed RD11 and may rotate in a first rotation direction (e.g., clockwise), and the second roller RL22 may have a second rotation speed RD22 and may rotate in a second rotation direction (e.g., counterclockwise) opposite to the first rotation direction. The third roller RL3 may have a third rotation speed RD3 and may rotate in a third rotation direction opposite to the second rotation direction. The fourth roller RL4 may have a fourth rotation speed RD4 and may rotate in a fourth rotation direction opposite to the third rotation direction. The diameter of the first roller RL11 and the diameter of the second roller RL22 may be greater than the diameter of the third roller RL3 and the diameter of the fourth roller RL4. However, the embodiment is not limited thereto.

[0130] The second rotation speed RD22 of the second roll RL22 may be greater than the first rotation speed RD11 of the first roll RL11. The third rotation speed RD3 of the third roll RL3 may be greater than the second rotation speed RD22 of the second roll RL22. The fourth rotation speed RD4 of the fourth roll RL4 may be greater than the third rotation speed RD3 of the third roll RL3. However, the embodiment is not limited thereto.

[0131] When the fine powder PM is supplied between the first roller RL11 and the second roller RL22 from the fine powder supply part PMS, the first roller RL11 and the second roller RL22 may rotate in different first and second rotation directions so that the supplied fine powder PM is rolled to form an electrode film (or a film for an electrode) PLT having a film shape. The electrode film PLT passing between the first roller RL11 and the second roller RL22 may be stretched while sequentially passing through the second roller RL22, the third roller RL3, and the fourth roller RL4.

[0132] Since the diameters of the first roll RL11 and the second roll RL22 are large, the pressure applied to the fine powder PM during calendering can be increased. Therefore, when the fine powder PM is turned into a film shape, the influence on the physical properties of the fine powder PM can be reduced, so that calendering is performed well.

[0133] The second rotation speed RD22 of the second roller RL22 may be greater than the first rotation speed RD11 of the first roller RL11. Therefore, even if the diameter of the first roller RL11 and the diameter of the second roller RL22 are almost the same, the linear speed of the second roller RL22 in the second rotation direction may become even greater than the linear speed of the first roller RL11 in the first rotation direction. Therefore, the electrode film PLT passing between the first roller RL11 and the second roller RL22 may be transferred toward the second roller RL22 having a higher linear speed than the linear speed of the first roller RL11.

[0134] The third rotation speed RD3 of the third roller RL3 may be greater than the second rotation speed RD22 of the second roller RL22. Therefore, even if the diameter of the third roller RL3 is smaller than the diameter of the second roller RL22, the linear velocity of the third roller RL3 in the third rotation direction may become even greater than the linear velocity of the second roller RL22 in the second rotation direction. Therefore, the electrode film PLT passing between the second roller RL22 and the third roller RL3 may be transferred toward the third roller RL3 having a higher linear velocity than that of the second roller RL22.

[0135] The fourth rotation speed RD4 of the fourth roller RL4 may be greater than the third rotation speed RD3 of the third roller RL3, and the linear speed of the fourth roller RL4 in the fourth rotation direction may become even greater than the linear speed of the third roller RL3 in the third rotation direction. Therefore, the electrode film PLT passing between the third roller RL3 and the fourth roller RL4 may be transferred toward the fourth roller RL4 having a higher linear speed than the linear speed of the third roller RL3.

[0136] The fine powder PM passed between the first roller RL11 and the second roller RL22 may be calendered to form an electrode film PLT having a film shape. The calendered electrode film PLT may be automatically transferred, extruded, and stretched while passing through the second roller RL22, the third roller RL3, and the fourth roller RL4. Because the electrode film PLT is automatically sequentially transferred to the second roller RL22, the third roller RL3, and the fourth roller RL4, extruded, and stretched, the electrode film PLT may not be stretched in a state where the electrode film PLT is subsequently elongated. Therefore, cracks or defects within the self-supporting electrode film PLT that may occur during the stretching process performed in a state where the self-supporting electrode film PLT is extended may be reduced, and rupture of the self-supporting electrode film PLT may be prevented during a subsequent lamination process.

[0137] According to the above reference Figures 1 to 6 Many features of the dry electrode manufacturing apparatus of the described embodiment are applicable to the present embodiment.

[0138] Reference Figure 8 A dry electrode manufacturing apparatus and a dry electrode manufacturing method according to other embodiments are described. Figure 82 is a cross-sectional view of a dry electrode manufacturing apparatus, a dry electrode manufacturing method, and a manufactured dry electrode according to other embodiments.

[0139] refer to Figure 8 The dry electrode manufacturing apparatus according to this embodiment is different from the dry electrode manufacturing apparatus according to the reference Figures 4 to 6 The dry electrode manufacturing apparatus of the described embodiments is similar, and detailed description of the same parts is omitted.

[0140] like Figure 8 As shown in , the dry electrode manufacturing apparatus according to the present embodiment may include a powder supply part or a fine powder supply part PMS for supplying powder or fine powder PM for an electrode and a plurality of rollers RL1, RL2, RL33 and RL42 for rolling and stretching the supplied fine powder PM. The dry electrode manufacturing apparatus according to the present embodiment may include a fifth roller RL52 in contact with the first roller RL1.

[0141] The first roller RL1 and the second roller RL2 among the plurality of rollers may calender the supplied fine powder PM, and the second roller RL2, the third roller RL33, and the fourth roller RL42 among the plurality of rollers RL1, RL2, RL33, RL42, and RL52 may stretch the calendered electrode film PLT to form a thin and uniform electrode film (i.e., dry electrode film) PLT. The embodiment is not limited thereto, and the number of rollers for stretching among the plurality of rollers may vary.

[0142] The first roller RL1 may have a first rotation speed RD1 and may rotate in a first rotation direction (e.g., clockwise), and the second roller RL2 may have a second rotation speed RD2 and may rotate in a second rotation direction (e.g., counterclockwise) opposite to the first rotation direction. The third roller RL33 may have a third rotation speed RD33 and may rotate in a third rotation direction opposite to the second rotation direction, and the fourth roller RL42 may have a fourth rotation speed RD42 and may rotate in a fourth rotation direction opposite to the third rotation direction. The fifth roller RL52 may have a fifth rotation speed RD52 and may rotate in a direction opposite to the first rotation direction of the first roller RL1.

[0143] The diameter of the second roller RL2 may be similar or the same as that of the first roller RL1, the diameter of the third roller RL33 may be greater than that of the second roller RL2, the diameter of the fourth roller RL42 may be similar or the same as that of the third roller RL33, and the diameter of the fifth roller RL52 may be greater than that of the first roller RL1. However, the embodiment is not limited thereto.

[0144] The second rotation speed RD2 of the second roll RL2 may be greater than the first rotation speed RD1 of the first roll RL1. The third rotation speed RD33 of the third roll RL33 may be similar to or the same as the second rotation speed RD2 of the second roll RL2, and the fourth rotation speed RD42 of the fourth roll RL42 may be greater than the third rotation speed RD33 of the third roll RL33. However, the embodiment is not limited thereto.

[0145] When the fine powder PM is supplied between the first roller RL1 and the second roller RL2 from the fine powder supply part PMS, the first roller RL1 and the second roller RL2 may rotate in different first and second rotation directions, so that the supplied fine powder PM is rolled to form an electrode film (or a film for an electrode) PLT having a film shape. The fifth roller RL52 that contacts the first roller RL1 to rotate in a rotation direction opposite to the first rotation direction of the first roller RL1 may apply pressure toward the first roller RL1 and the second roller RL2 together with the third roller RL33 adjacent to the second roller RL2 while the first roller RL1 and the second roller RL2 are supported. Therefore, the pressure between the first roller RL1 and the second roller RL2 for rolling can be increased, and even if the fine powder PM is supplied between the first roller RL1 and the second roller RL2, the first roller RL1 and the second roller RL2 can be prevented from being pushed, so that the active material particles within the electrode film PLT formed by rolling are uniformly arranged. Because the diameters of the fifth roller RL52 and the third roller RL33, which apply pressure toward the first roller RL1 and the second roller RL2 while the first roller RL1 and the second roller RL2 are supported, are larger than the diameters of the first roller RL1 and the second roller RL2, the fifth roller RL52 and the third roller RL33 can well support the first roller RL1 and the second roller RL2 and can apply large pressure to the first roller RL1 and the second roller RL2.

[0146] The electrode film PLT passing between the first roll RL1 and the second roll RL2 may be stretched while sequentially passing through the second roll RL2 , the third roll RL33 , and the fourth roll RL42 .

[0147] The second rotation speed RD2 of the second roller RL2 may be greater than the first rotation speed RD1 of the first roller RL1, so that the linear speed of the second roller RL2 in the second rotation direction is greater than the linear speed of the first roller RL1 in the first rotation direction. Therefore, the electrode film PLT passing between the first roller RL1 and the second roller RL2 may be transferred toward the second roller RL2 having a higher linear speed than the linear speed of the first roller RL1. The third rotation speed RD33 of the third roller RL33 may be almost the same as the second rotation speed RD2 of the second roller RL2, but the diameter of the third roller RL33 may be greater than the diameter of the second roller RL2, so that the linear speed of the third roller RL33 in the third rotation direction is greater than the linear speed of the second roller RL2 in the second rotation direction. Therefore, the electrode film PLT passing between the second roller RL2 and the third roller RL33 may be transferred toward the third roller RL33 having a higher linear speed than the linear speed of the second roller RL2.

[0148] The fourth rotation speed RD42 of the fourth roller RL42 may be greater than the third rotation speed RD33 of the third roller RL33. Therefore, even if the diameter of the fourth roller RL42 and the diameter of the third roller RL33 are almost the same, the linear speed of the fourth roller RL42 in the fourth rotation direction may be greater than the linear speed of the third roller RL33 in the third rotation direction. Therefore, the electrode film PLT passing between the third roller RL33 and the fourth roller RL42 may be transferred toward the fourth roller RL42 having a higher linear speed than the linear speed of the third roller RL33.

[0149] The fine powder PM passed between the first roller RL1 and the second roller RL2 may be calendered to form an electrode film PLT having a film shape. The calendered electrode film PLT may be automatically transferred, extruded, and stretched while passing through the second roller RL2, the third roller RL33, and the fourth roller RL42. Because the electrode film PLT is automatically sequentially transferred to the second roller RL2, the third roller RL33, and the fourth roller RL42, extruded, and stretched, the electrode film PLT may not be stretched in a state where the electrode film PLT is subsequently elongated. Therefore, cracks or defects within the self-supporting electrode film PLT that may occur during the stretching process performed in a state where the self-supporting electrode film PLT is extended long may be reduced, and rupture of the self-supporting electrode film PLT may be prevented during a subsequent lamination process.

[0150] According to the above reference Figures 1 to 7 Many features of the dry electrode manufacturing apparatus of the described embodiment are applicable to the present embodiment.

[0151] In one embodiment, a method for manufacturing a dry electrode may include: supplying powder between a first roller and a second roller; rolling the powder to form an electrode film by rotating the first roller at a first rotation speed in a first direction and rotating the second roller at a second rotation speed in a second direction different from the first direction; and stretching the rolled electrode film through a third roller and a fourth roller, and the electrode film is sequentially transferred to the second roller, the third roller, and the fourth roller.

[0152] While the present disclosure has been described in connection with what are presently considered to be practical embodiments, it is to be understood that the present disclosure is not limited to the disclosed embodiments. Instead, the present disclosure encompasses various modifications and equivalent arrangements.

Claims

1. A dry electrode manufacturing device, comprising: a powder supplying portion configured to supply powder; a first roller and a second roller configured to roll the powder supplied from the powder supply portion to form an electrode film; as well as a third roller and a fourth roller configured to stretch the rolled electrode film formed by the first roller and the second roller, wherein the first roller is configured to rotate at a first rotation speed in a first direction, the second roller is configured to rotate at a second rotation speed in a second direction different from the first direction, the third roller is configured to rotate at a third rotation speed in a third direction different from the second direction, the fourth roller is configured to rotate at a fourth rotation speed in a fourth direction different from the third direction, and The dry electrode manufacturing equipment is configured so that the linear speed of the second roller in the second direction is greater than the linear speed of the first roller in the first direction, the linear speed of the third roller in the third direction is greater than the linear speed of the second roller in the second direction, and the linear speed of the fourth roller in the fourth direction is greater than the linear speed of the third roller in the third direction.

2. The dry electrode manufacturing apparatus according to claim 1, wherein the second rotation speed of the second roller is greater than the first rotation speed of the first roller, the third rotation speed of the third roller is greater than the second rotation speed of the second roller, and the fourth rotation speed of the fourth roller is greater than the third rotation speed of the third roller. 3 . The dry electrode manufacturing apparatus according to claim 2 , further comprising a fifth roller contacting the first roller and configured to rotate in a direction different from the first direction. 4 . The dry electrode manufacturing apparatus according to claim 1 , wherein the diameter of the second roller is larger than the diameter of the first roller, the diameter of the third roller is larger than the diameter of the second roller, and the diameter of the fourth roller is larger than the diameter of the third roller. 5 . The dry electrode manufacturing apparatus according to claim 4 , further comprising a fifth roller contacting the first roller and configured to rotate in a direction different from the first direction. 6 . The dry electrode manufacturing apparatus according to claim 1 , further comprising a fifth roller contacting the first roller and configured to rotate in a direction different from the first direction. 7 . The dry electrode manufacturing apparatus according to claim 6 , wherein a diameter of the fifth roller is the same as a diameter of the first roller, a diameter of the second roller, a diameter of the third roller, and a diameter of the fourth roller.

8. The dry electrode manufacturing apparatus according to claim 6, wherein the diameter of the fifth roller is the same as the diameter of the first roller, the diameter of the second roller is larger than the diameter of the first roller, the diameter of the third roller is larger than the diameter of the second roller, and the diameter of the fourth roller is larger than the diameter of the third roller. 9 . The dry electrode manufacturing apparatus according to claim 6 , wherein a diameter of the fifth roller is larger than a diameter of the first roller, and a diameter of the fourth roller is the same as the diameter of the first roller. 10 . The dry electrode manufacturing apparatus according to claim 6 , wherein a diameter of the fifth roller is larger than a diameter of the first roller, and a diameter of the fourth roller is the same as the diameter of the fifth roller.

11. A dry electrode manufacturing device comprising: a powder supplying portion configured to supply powder; a first roller and a second roller configured to roll the powder supplied from the powder supply portion to form an electrode film; as well as a third roller and a fourth roller configured to stretch the rolled electrode film formed by the first roller and the second roller, The surface adhesion of the second roller is greater than that of the first roller, the surface adhesion of the third roller is greater than that of the second roller, and the surface adhesion of the fourth roller is greater than that of the third roller.

12. The dry electrode manufacturing apparatus according to claim 11, wherein the surface roughness of the second roller is greater than the surface roughness of the first roller, the surface roughness of the third roller is greater than the surface roughness of the second roller, and the surface roughness of the fourth roller is greater than the surface roughness of the third roller.

13. The dry electrode manufacturing equipment according to claim 12, wherein a first protrusion is arranged on the surface of the second roller, a second protrusion is arranged on the surface of the third roller, a third protrusion is arranged on the surface of the fourth roller, a width and a height of the second protrusion are greater than a width and a height of the first protrusion, and a width and a height of the third protrusion are greater than the width and the height of the second protrusion.

14. A method for manufacturing a dry electrode, the method comprising: supplying powder between the first roller and the second roller; rolling the powder to form an electrode film by rotating the first roller at a first rotation speed in a first direction and rotating the second roller at a second rotation speed in a second direction different from the first direction; as well as The electrode film is stretched and rolled by a third roller and a fourth roller, The electrode film is sequentially transferred to the second roller, the third roller, and the fourth roller.

15. The manufacturing method according to claim 14, wherein the third roller rotates at a third rotation speed in a third direction different from the second direction, the fourth roller rotates at a fourth rotation speed in a fourth direction different from the third direction, the second rotation speed of the second roller is greater than the first rotation speed of the first roller, the third rotation speed of the third roller is greater than the second rotation speed of the second roller, and the fourth rotation speed of the fourth roller is greater than the third rotation speed of the third roller.

16. The manufacturing method according to claim 14, wherein the third roller rotates at a third rotation speed in a third direction different from the second direction, the fourth roller rotates at a fourth rotation speed in a fourth direction different from the third direction, and The first rotation speed of the first roller, the second rotation speed of the second roller, the third rotation speed of the third roller, and the fourth rotation speed of the fourth roller are the same. 17 . The manufacturing method according to claim 16 , wherein the diameter of the second roller is larger than the diameter of the first roller, the diameter of the third roller is larger than the diameter of the second roller, and the diameter of the fourth roller is larger than the diameter of the third roller.

18. A dry electrode film produced by the method according to any one of claims 14 to 17.

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