Pressing device including fluid and electrode and electrode assembly manufacturing method using the pressing device

Abstract

The present invention relates to a pressing device capable of uniformly pressing a target object to be pressed using a pressure adjustment portion containing a fluid regardless of the shape of the target object, and a pressing method using the pressing device.

Description

Technical Field

[0001] This application claims the benefit of priority to Korean Patent Application No. 2020-0066918, filed on Jun. 3, 2020, the disclosure of which is incorporated herein by reference in its entirety.

[0002] The present invention relates to a pressing device including a fluid and a pressing method using the pressing device, and more specifically, to a pressing device and a pressing method using the pressing device, wherein the pressing device includes a pressure regulating part containing a fluid therein, thereby changing the pressure applied to the target object according to the shape of the target object to be pressed. Background Art

[0003] With the recent development of alternative energy sources due to air pollution and energy consumption caused by the use of fossil fuels, the demand for secondary batteries capable of storing generated electrical energy has increased. Secondary batteries capable of charging and discharging are closely used in daily life. For example, secondary batteries are used in mobile devices, electric vehicles, and hybrid electric vehicles.

[0004] Secondary batteries used as energy sources for various electronic devices inevitably used in modern society are used in a state of being installed in various devices such as mobile devices and electric vehicles. In response to user needs and changes in the shape of devices installed with secondary batteries, battery cells of various shapes are required.

[0005] Generally, battery cells of various shapes can be formed by accommodating an electrode having a shape corresponding to the shape of the case in a curved or bent case or by stacking an electrode assembly consisting of electrodes. In order to form electrodes of various shapes, an electrode active material is applied to one surface or two opposite surfaces of an electrode current collector formed to have a uniform shape, and then pressed. In addition, for electrode assemblies of various shapes, electrodes and separators of various shapes are stacked, and a lamination process is performed to increase the bonding force between them.

[0006] Figure 1 is a schematic diagram of a conventional pressing device.

[0007] In order to press the target object 10 to be pressed, the pressing portion of the conventional pressing device 20, that is, the portion configured to contact the target object 10, is flat. However, the pressing device 20 having a flat pressing portion cannot apply uniform force to the target objects 10 having various heights or shapes.

[0008] That is, a stronger force is applied to a portion of the target object 10 that is more protruding than other portions of the target object, and a weaker force is applied to a portion of the target object 10 that is more recessed than other portions of the target object, so that the target object 10 cannot be uniformly laminated. In order to solve the above problem, an additional pressing process may be performed for the portion of the target object 10 that is not properly laminated. However, in this case, due to the performance of such an additional process, the process time is extended and the related cost increases.

[0009] In Patent Document 1, a pattern is formed on the surface of the roller member so that the compressive force transmitted to the electrode and the diaphragm is applied only to a partial area of ​​the electrode and the diaphragm. However, there is a problem that only a portion of the target object is compressed, so that the entire target object cannot be pressed uniformly at once.

[0010] In order to solve the above-mentioned problems, it is necessary to consider a method that can uniformly press the target object while shortening the process time.

[0011] (Prior art literature)

[0012] (Patent Document 1) Korean Patent Application Publication No. 2017-0099213 (August 31, 2017) Summary of the invention

[0013] Technical issues

[0014] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a pressing device capable of applying a uniform pressing force to a target object to be pressed.

[0015] Another object of the present invention is to use the pressing device to easily produce electrodes or electrode assemblies of various shapes. Another object of the present invention is to simplify the manufacturing process of electrodes and electrode assemblies and reduce the defect rate, thereby reducing production costs.

[0016] Technical Solution

[0017] In order to achieve the above-mentioned purpose, the pressing device according to the present invention includes: a contact part, which has a shape or height that changes according to the shape of the target object to be pressed; a pressing part, which is configured to apply a uniform force to the contact part; and a pressure regulating part located between the contact part and the pressing part, and the pressure regulating part contains a fluid.

[0018] In addition, the contact portion may have a pattern configured to change a pressure applied to the target object according to a shape of the target object.

[0019] The pattern may be a diagonal line pattern, an X-shaped pattern, or a dot pattern having a plurality of micro-scale protrusions.

[0020] The contact portion may be composed of a plurality of protrusions configured to be individually movable.

[0021] The pressure regulating portion may be individually connected to the contact portion.

[0022] In addition, the pressing portion may be connected to the pressure adjusting portion individually or integrally.

[0023] The fluid contained in the pressure regulating part may be connected to the plurality of protrusions.

[0024] In addition, the fluid may be contained in the pressure regulating part at a percentage less than 90%.

[0025] Furthermore, the pressing device may include an upper roller including the contact portion, the pressing portion, and the pressure adjusting portion; and a lower roller having the same configuration as the upper roller.

[0026] The present invention provides a method for manufacturing an electrode and an electrode assembly, comprising the following steps: (S1) preparing an electrode or an electrode assembly as a target object to be pressed; (S2) setting the target object in the pressing device; and (S3) pressing the target object using the pressing device.

[0027] In step (S3), the pressing device may be deformed according to the shape of the target object, or the pressing force applied to the contact portion configured to contact the target object may be changed according to the shape of the target object.

[0028] The present invention provides a unit cell including the electrode or electrode assembly described above. In addition, the present invention provides a battery module or battery pack including the unit cell. In addition, the present invention provides a device in which the unit cell, the battery module or the battery pack is installed.

[0029] In the present invention, one or more configurations that do not conflict with each other may be selected and combined from the above configurations.

[0030] Beneficial Effects

[0031] It is obvious from the above description that the pressing device according to the present invention includes: a contact portion, which has a shape that can be changed according to the shape of a target object to be pressed; a pressing portion, which is configured to apply a uniform force to the contact portion; and a pressure adjusting portion, which is configured to differently adjust the force applied from the pressing portion according to the shape of the target object to change the shape of the contact portion, so that regardless of the shape of the target object, a uniform pressing force can be applied to the target object.

[0032] In addition, the target object can be uniformly laminated while maintaining its uniform shape, and a uniform pressing force is applied to the target object regardless of its shape. As a result, all parts of the target object are uniformly laminated, thereby obtaining a target object whose uniform shape is maintained. In addition, defects of the target object at its specific part are significantly reduced.

[0033] Furthermore, it is not necessary to perform an additional process for uniform lamination, so that the time and cost generated in the process can be reduced, which is economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of a conventional pressing device.

[0035] Figure 2 is a schematic diagram of a pressing device according to the present invention.

[0036] Figure 3 is a schematic diagram of a pressing device configured to have a pressing roller type structure according to the present invention.

[0037] Figure 4 is a schematic diagram showing the interior of a pressing device according to a first embodiment of the present invention.

[0038] Figure 5 is a schematic diagram showing the interior of a pressing device according to a second embodiment of the present invention.

[0039] Figure 6 is a photograph showing the shape of the pattern of the contact portion according to the present invention. DETAILED DESCRIPTION

[0040] Now, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the preferred embodiments of the present invention. However, in describing the working principle of the preferred embodiments of the present invention in detail, when the detailed description of the known functions and structures incorporated herein may obscure the subject matter of the present invention, the detailed description will be omitted.

[0041] In addition, the same reference numerals will be used throughout the drawings to represent components that perform similar functions or operations. Where a component is referred to as being connected to another component throughout the application, the component may not only be directly connected to the other component, but the component may also be indirectly connected to the other component via another component. In addition, the inclusion of a certain element does not mean the exclusion of other elements, but means that other elements may be further included unless otherwise specified.

[0042] Figure 2 is a schematic diagram of a pressing device according to the present invention, Figure 3is a schematic diagram of a pressing device configured to have a pressing roller type structure according to the present invention, Figure 4 is a schematic diagram showing the interior of a pressing device according to a first embodiment of the present invention, Figure 5 is a schematic diagram showing the interior of a pressing device according to a second embodiment of the present invention.

[0043] The pressing device 200 according to the present invention is characterized in that uniform pressure can be applied to the target object 100 regardless of the shape of the target object 100 .

[0044] The target object 100 may be an electrode having an active material applied to one surface or opposite surfaces of an electrode collector, or an electrode assembly including electrodes each formed as described above, ie, a positive electrode and a negative electrode, which are stacked with a separator interposed therebetween.

[0045] The positive electrode includes a positive electrode active material layer applied to at least one surface of a positive electrode current collector. The positive electrode active material layer can be manufactured by applying a positive electrode mixture of a positive electrode active material, a conductive agent, and a binder. A filler can be further added to the positive electrode mixture as needed.

[0046] Typically, the positive current collector is manufactured to have a thickness of 3 μm to 500 μm. There is no particular limitation on the positive current collector, as long as the positive current collector exhibits high conductivity and at the same time the positive current collector does not cause any chemical changes in the battery to which the positive current collector is applied. For example, the positive current collector may be made of stainless steel, aluminum, nickel or titanium. Alternatively, the positive current collector may be made of aluminum or stainless steel whose surface is treated with carbon, nickel, titanium or silver. Specifically, aluminum can be used. The positive current collector may be formed with a micro-scale concave-convex pattern on its surface to increase the adhesion to the positive active material layer. The positive current collector may be configured as any of various forms such as a film, a sheet, a foil, a net, a porous body, a foam body or a non-woven fabric body.

[0047] The positive electrode active material may be composed of, for example, a layered compound such as lithium nickel oxide (LiNiO2) or a compound substituted with one or more transition metals; 1+x Mn 2-x Lithium manganese oxide represented by LiMnO4 (where x=0 to 0.33), or lithium manganese oxide such as LiMnO3, LiMn2O3, or LiMnO2; lithium copper oxide (Li2CuO2); vanadium oxide such as LiV3O8, LiV3O4, V2O5, or Cu2V2O7; 1-x M x O2 (wherein M = Co, Mn, Al, Cu, Fe, Mg, B, or Ga, and x = 0.01 to 0.3) represented by Ni-based lithium nickel oxide; represented by the chemical formula LiMn 2-xM x O2 (wherein M = Co, Ni, Fe, Cr, Zn, or Ta, and x = 0.01 to 0.1) or a lithium manganese composite oxide represented by the chemical formula Li2Mn3MO8 (wherein M is Fe, Co, Ni, Cu, or Zn); LiMn2O4 in which a portion of Li in the chemical formula is replaced by an alkaline earth metal ion; a disulfide compound; or Fe2(MoO4)3. However, the present invention is not limited thereto.

[0048] The conductive agent is generally added so that the conductive agent accounts for 0.1 wt % to 30 wt % of the total weight of the mixture including the positive electrode active material. The conductive agent is not particularly limited as long as the conductive agent exhibits high conductivity without causing any chemical changes in the battery to which the conductive agent is applied. For example, the following materials can be used as the conductive agent: graphite, such as natural graphite or artificial graphite; carbon black, such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, or thermal black; conductive fibers, such as carbon fibers or metal fibers; carbon fluoride powder; metal powder, such as aluminum powder, or nickel powder; conductive whiskers, such as zinc oxide or potassium titanate; conductive metal oxides, such as titanium oxide; or conductive materials, such as polyphenylene derivatives.

[0049] The binder included in the positive electrode is a component that assists the bonding between the active material and the conductive agent and assists the bonding with the current collector. The binder is usually added in an amount of 0.1% to 30% by weight based on the total weight of the mixture including the positive active material. As an example of a binder, polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinyl pyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer, sulfonated ethylene-propylene-diene monomer, styrene-butadiene rubber, fluororubber, and various copolymers can be used.

[0050] The negative electrode is manufactured by applying the negative electrode active material to one surface or both opposite surfaces of the negative electrode current collector and drying it, thereby providing a negative electrode active material layer on one surface of the negative electrode. The above components may be further selectively included as needed.

[0051] Since the negative electrode is provided as a single-sided negative electrode having a negative active material layer provided on only one surface of a negative current collector, a space of the pouch-shaped secondary battery occupied by the negative electrode is reduced, thereby increasing the capacity of the pouch-shaped secondary battery.

[0052] As the negative electrode active material, for example, the following materials can be used: carbon such as non-graphitizable carbon or graphite-based carbon; metal composite oxides such as Li x Fe2O3(0≤x≤1), Li x WO2(0≤x≤1) and Sn x Me 1-x Me'y O z (Me: Mn, Fe, Pb, Ge; Me': Al, B, P, Si, elements of Groups 1, 2 and 3 of the periodic table, halogens; 0≤x≤1; 1≤y≤3; 1≤z≤8); lithium metal; lithium alloy; silicon alloy; tin alloy; metal oxides such as SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, or Bi2O5; conductive polymers such as polyacetylene; or Li-Co-Ni based materials.

[0053] The separator is interposed between the positive electrode and the negative electrode, and an insulating film showing high ion permeability and high mechanical strength is used as the separator. The separator generally has a pore size of 0.01 μm to 10 μm and a thickness of 5 μm to 300 μm. As the material of the separator, for example, a sheet or non-woven fabric made of an olefin polymer such as polypropylene showing chemical resistance and hydrophobicity, glass fiber or polyethylene is used. In the case of using a solid electrolyte such as a polymer as the electrolyte, the solid electrolyte can also be used as a separator.

[0054] The electrode assembly may be a stacked electrode assembly composed of unit cells, each of which is configured to have a structure in which a rectangular positive electrode and a rectangular negative electrode are stacked with a separator interposed therebetween, or the electrode assembly may be a laminated / stacked electrode assembly, which is configured to have a structure in which unit cells are stacked to be attached to each other with a separator interposed therebetween, but the present invention is not limited thereto. However, preferably, the electrode assembly is not a jelly roll type electrode assembly configured to have a structure in which a long sheet type positive electrode and a long sheet type negative electrode are wound with a separator interposed therebetween, or a stacked folded type electrode assembly configured to have a structure in which unit cells are wound using a long separator, which reduces the impregnation of the electrolyte solution.

[0055] The pressing device according to the present invention presses the positive electrode, the negative electrode or the electrode assembly in the stacking direction.

[0056] Reference Figure 2 A pressing device 200 is described, which includes: a pressing portion 210, the pressing portion 210 is configured to apply a uniform force in the pressing device; a contact portion 220, the contact portion 220 is configured to directly contact the target object 100; and a pressure regulating portion 230 located between the pressing portion and the contact portion, and the pressure regulating portion contains a fluid.

[0057] The pressing device 200 moves toward the target object 100 through the pressing portion 210 , and the contact portion 220 of the pressing device 200 may come into contact with the entire outer surface of the target object 100 .

[0058] In addition, Figure 3 In the pressing roller type pressing device shown in , the pressing portion 210 may not be connected to the pressure regulating portion, but may be connected to another area capable of simultaneously pressing the pressure regulating portion and the contact portion 220, such as Figure 3 as shown in .

[0059] like Figure 2 As shown in , the pressing portion 210 may be configured to contact the pressure regulating portion 230. Alternatively, as shown in Figure 3 As shown in , the pressing portion may be configured to press a roller including a contact portion 220 and a pressure regulating portion (not shown). The roller may be configured such that the contact portion is located on the outer surface of the roller and the pressure regulating portion is disposed inside the contact portion.

[0060] The pressing part 210 may be configured to move the pressing device 200 using physical mechanical force, or the pressing part 210 may be located inside the pressing device to move members constituting the pressing device, such as the contact part 220 and the pressure adjusting part 230 , using hydraulic pressure to perform pressing.

[0061] Typically, the pressing portion 210 may apply a pressing force of 1 kg / mm ​​to 100 kg / mm ​​to the contact portion 220 to contact the target object 100; however, the pressing force may vary depending on the thickness of the target object 100, the elasticity of the target object 100, and the purpose to be achieved by pressing.

[0062] The contact portion 220 configured to directly contact the target object 100 may be deformed according to the shape of the target object 100. For example, the contact portion 220 may be made of an elastic material. Therefore, even in the case where the outer surface of the target object includes a curved portion or a bent portion, the contact portion may be deformed to be in close contact with the entire outer surface of the target object.

[0063] For example, Figure 2 As shown in , the shape of the contact portion 220 may vary according to the shape of the target object 100. Figure 2 It can be seen that the shape of the contact portion 220 changes to a shape corresponding to the target object 100 due to the force applied by the pressing portion 210. The pressure regulating portion 230 contains a fluid. Therefore, the pressure applied by the pressing portion 210 is distributed according to the shape of the target object 100, so that the shape of the contact portion 220 changes to a shape corresponding to the outer shape of the target object 100. At this time, since the early pressing force F1 applied by the pressing portion 210 is appropriately dispersed by the fluid contained in the pressure regulating portion 230 according to the shape of the target object 100, the late pressing force F2 applied by the pressure regulating portion 230 is generated, so that the contact portion 220 presses the entire area of ​​the target object 100.

[0064] For example, Figure 4 and Figure 5As shown in , the height of the contact portion 220 may be changed. That is, the shape of the pressure adjustment portion 230 in which the fluid is contained may be changed, thereby adjusting the protrusion or recess of the contact portion.

[0065] Specifically, according to Figure 4 The pressing device 200 of the first embodiment shown in FIG. 1 may be configured to have a structure in which a single pressure regulating portion 230 is connected to a plurality of contact portions 220. That is, the pressure regulating portion 230 may be a single member connected to the contact portion 220 composed of a plurality of protrusions, and a fluid may be contained in the pressure regulating portion.

[0066] At this time, the fluid may be contained in the pressure adjusting portion at a percentage less than 90%, so that the fluid may be moved by the pressing portion 210 and the contact portion 220 .

[0067] At this time, due to Figure 4 The components constituting the pressing device 200 shown in the figure, namely the contact portion 220, the pressing portion 210 and the pressure adjusting portion 230, move together, so the contact portion 220 can be operated in a manner in which the contact portion 220 protrudes from a surface of the pressing device 200 to the outside of the pressing device 200 or is recessed into the pressing device.

[0068] In accordance with Figure 5 In the pressing device 200 of the second embodiment shown in , the pressure adjusting part 230 may be individually connected to the contact part 220. That is, the pressure adjusting part 230 may be individually connected to the patterned contact part 220 to adjust the shape or height of the contact part 220.

[0069] At this time, the pressing portion 210 can be Figure 5 As shown in FIG. 1 , the pressure regulating portion 230 may be connected individually, that is, one-to-one, to the pressure regulating portion 230, or a plurality of pressing portions 210 may be connected as shown in FIG. Figure 4 As shown in FIG. 1 , it is integrally connected to a single pressure regulating portion 230 .

[0070] In the case where the pressure-adjusting portion 230 is individually connected to the contact portion 220 , the movement range or deformation range of each contact portion 220 may be further increased.

[0071] The contact portion 220 may be formed separately from the pressure-adjusting portion 230 , or the contact portion 220 and the pressure-adjusting portion 230 may be integrally formed.

[0072] like Figure 5 As shown in , the contact portion 220 is composed of a plurality of protrusions configured to be individually movable, so that the moving ranges of the protrusions may be different from each other according to the shape of the target object 100 .

[0073] At this time, the contact part 220 may be configured to have a pattern in which heights of protrusions are different from each other according to the shape of the target object 100 .

[0074] Figure 6 is a photograph showing the shape of the pattern of the contact portion according to the present invention.

[0075] from Figure 6 It can be seen that the contact portion 220 according to the present invention may have a diagonal line pattern (a), an X-shaped pattern (b), or a dot-type pattern having a plurality of micro-scale protrusions (c).

[0076] The oblique line pattern may be used in a case where the shape of the target object 100 is the same oblique line shape as the pattern of the contact portion 220 while having a uniform height, or in a case where the target object has the same shape as the pattern of the contact portion based on a specific reference line.

[0077] Furthermore, in the case where a target object 100 having a varying height and a uniform pattern is pressed, an X-shaped pattern (b) may be used, and in the case where an amorphous target object 100 is pressed, a dot-type pattern (c) may be used.

[0078] The interval or size of the pattern may be changed according to the shape of the target object 100. However, it is generally preferred that the interval of the pattern is 1 mm to 100 mm. In the case where the interval of the pattern is smaller than the above range, it may be difficult to finely adjust or form the contact portion 220 having the pattern by the fluid. In the case where the interval of the pattern is larger than the above range, it may be difficult to achieve uniformity of lamination by uniform pressing force, which must be achieved in the present invention.

[0079] The contact part 220 may perform heating while performing pressing. As a result, lamination for increasing the bonding force of the positive electrode, the negative electrode, or the electrode assembly may be easily achieved.

[0080] The pressing device according to the first embodiment may be configured to have a structure in which a single pressure adjusting portion 230 is connected to a plurality of contact portions 220, such as Figure 4 That is, the pressure regulating portion 230 may be composed of a single fluid layer connected to the contact portion 220 composed of a plurality of protrusions.

[0081] At this time, the fluid may be contained in the pressure adjusting portion at a percentage less than 90%, so that the fluid may be moved by the pressing portion 210 and the contact portion 220 .

[0082] In the pressing device according to the second embodiment, the pressure adjusting portion 230 may be connected to the contact portion 220 separately, such as Figure 5 That is, the pressure adjustment part 230 may be individually connected to the patterned contact part 220 to adjust the shape or height of the contact part 220 .

[0083] At this time, the pressing part 210 may be connected to the pressure regulating part 230 separately or may be connected to the pressure regulating part 230 integrally.

[0084] In the case where the pressure-adjusting portion 230 is individually connected to the contact portion 220 , the movement range or deformation range of each contact portion 220 may be further increased.

[0085] In addition, Figure 3 In the pressing roller type pressing apparatus shown in , the pressing part 210 may not be connected to the pressure adjusting part 230 .

[0086] The contact portion 220 may be formed separately from the pressure-adjusting portion 230 , or the contact portion 220 and the pressure-adjusting portion 230 may be integrally formed.

[0087] Although the pressing device 200 according to the present invention can press the target object 100 only in one direction according to the shape of the target object 100, the pressing device 200 can be composed of an upper roller and a lower roller, each of which includes a pressing portion 210, a contact portion 220 and a pressure adjusting portion 230 so as to press the three-dimensional target object 100.

[0088] The electrode and electrode assembly manufacturing method according to the present invention includes the following steps: (S1) preparing an electrode or an electrode assembly as a target object to be pressed; (S2) setting the target object in the above-mentioned pressing device; and (S3) pressing the target object using the pressing device.

[0089] The pressing device can press one surface or two opposite surfaces of the target object. At this time, the direction in which the pressing device presses the target object can be changed according to the shape of the target object.

[0090] In order to uniformly press the target object while maintaining the shape of the target object, the pressing device may be deformed according to the shape of the target object, or the pressing force applied to the contact portion in contact with the target object may be changed according to the shape of the target object. As described above, since the pressing device has a shape that changes according to the shape of the target object, uniform pressure can be applied to the target object. As a result, the target object can be uniformly laminated, so that the defect rate of the target object can be reduced and target objects of various shapes can be formed.

[0091] The present invention provides a unit cell including the electrode or electrode assembly described above. In addition, the present invention provides a battery module or battery pack including the unit cell. In addition, the present invention provides a device equipped with the unit cell, the battery module or the battery pack.

[0092] The device may be an electronic device including a large-capacity battery, such as an electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle.

[0093] Those skilled in the art to which the present invention pertains will appreciate that various applications and modifications are possible within the scope of the present invention based on the above description.

[0094] (Explanation of reference numbers)

[0095] 10, 100: Target audience

[0096] 20, 200: Pressing equipment

[0097] 210: Pressing part

[0098] 220: Contact Department

[0099] 230: Pressure regulation unit

[0100] F1: Early pressing force

[0101] F2: Later pressing force.

[0102] Industrial Applicability

[0103] It is obvious from the above description that the pressing device according to the present invention includes: a contact portion, which has a shape that can be changed according to the shape of a target object to be pressed; a pressing portion, which is configured to apply a uniform force to the contact portion; and a pressure adjusting portion, which is configured to differently adjust the force applied from the pressing portion according to the shape of the target object to change the shape of the contact portion, so that regardless of the shape of the target object, a uniform pressing force can be applied to the target object.

[0104] In addition, the target object can be uniformly laminated while maintaining its uniform shape, and a uniform pressing force is applied to the target object regardless of its shape. As a result, all parts of the target object are uniformly laminated, thereby obtaining a target object whose uniform shape is maintained. In addition, defects of the target object at its specific part are significantly reduced.

Claims

1. A pressing device for pressing an electrode or an electrode assembly, comprising: a contact portion having a shape or height that changes according to a shape of an electrode or an electrode assembly to be pressed; a pressing portion configured to apply a uniform force to the contact portion; as well as a pressure regulating portion located between the contact portion and the pressing portion, wherein the pressure regulating portion contains a fluid, wherein the contact portion is composed of a plurality of protrusions configured to be able to move individually, and The pressure regulating part is separately connected to the contact part. 2 . The pressing device according to claim 1 , wherein the contact portion has a pattern configured to change a pressure applied to the electrode or the electrode assembly according to a shape of the electrode or the electrode assembly. 3 . The pressing device according to claim 2 , wherein the pattern is a diagonal line pattern, an X-shaped pattern, or a dot pattern having a plurality of micro-scale protrusions. The pressing device according to claim 1 , wherein the pressing portion is connected to the pressure adjusting portion individually or integrally. The pressing device according to claim 1 , wherein the fluid contained in the pressure regulating portion is connected to the plurality of protrusions. The pressing device according to claim 1 , wherein the fluid is contained in the pressure regulating part at a percentage less than 90%.

7. The pressing device according to claim 1, wherein the pressing device comprises: an upper roller, the upper roller comprising the contact portion, the pressing portion and the pressure regulating portion; and A lower roller having the same structure as the upper roller.

8. A method for manufacturing an electrode and an electrode assembly, comprising the following steps: (S1) preparing an electrode or an electrode assembly as a target object to be pressed; (S2) placing the target object in a pressing device according to any one of claims 1 to 7; and (S3) Pressing the target object using the pressing device.

9. The method for manufacturing an electrode and an electrode assembly according to claim 8, wherein: In step (S3), the pressing device is deformed according to the shape of the target object, or the pressing force applied to the contact portion configured to contact the target object is changed according to the shape of the target object.

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