Apparatus for manufacturing electrode

Abstract

An apparatus for manufacturing an electrode, according to an embodiment of the present invention, comprises: a plurality of calendering rolls arranged at predetermined intervals to sequentially calender an electrode sheet; and a plurality of housings that individually support the respective rotational axes of the plurality of calendering rolls, wherein an extension length of at least one housing among the plurality of housings in a traveling direction of the electrode sheet may be different from the extension length of the remaining housings.

Description

Electrode manufacturing device

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0071831, filed May 31, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to an electrode manufacturing device, and more particularly, to an electrode manufacturing device capable of improving deformation occurring in a housing supporting each calendaring roll.

[0004] In modern society, the widespread use of portable devices like cell phones, laptops, camcorders, and digital cameras, as well as energy storage systems (ESS), has led to active development of related technologies. Furthermore, rechargeable secondary batteries are increasingly being used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) to address air pollution issues caused by conventional gasoline-powered vehicles. This, in turn, heightens the need for further development of these batteries.

[0005] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving the most attention due to their advantages of free charging and discharging, low self-discharge rate, and high energy density.

[0006] The manufacturing process for these lithium secondary batteries is broadly divided into three stages: electrode processing, assembly processing, and formation processing. The electrode processing is further subdivided into active material mixing, electrode coating, rolling, slitting, and winding processes. Among these, the electrode coating process is divided into a wet process, which applies an active material slurry to the electrode current collector, and a dry process, which applies the active material to the current collector in a solid state.

[0007] When forming electrodes using a wet process, the solvent evaporates and is removed, potentially creating defects such as pinholes or cracks in the electrode active material layer. Furthermore, the drying process consumes significant energy to remove the large volume of solvent, and requires large, expensive drying equipment, significantly reducing the overall processability of the secondary battery.

[0008] To overcome the shortcomings of these wet processes, research has been actively conducted recently on methods for manufacturing dry electrodes for secondary batteries through a dry process that does not use solvents.

[0009] The dry electrode process is a method of manufacturing an electrode by mixing electrode active materials, binders, and conductive materials without a liquid medium such as a solvent or dispersion medium, manufacturing the powder mixture into a dry electrode sheet through a calendaring process, and laminating the manufactured dry electrode sheet onto a current collector.

[0010] This dry electrode process has the advantages of excellent electrode adhesion and life characteristics due to uniform binder distribution in the direction of electrode thickness, low interfacial reaction resistance on the surface of the active material because the binder does not directly cover the surface of the active material, favorable movement of lithium ions within the electrode, and very high electrode flexibility due to the use of a fiberizable binder.

[0011] Figure 1 is a schematic drawing of a conventional electrode manufacturing device.

[0012] Referring to FIG. 1, a conventional electrode manufacturing device (10) may include a plurality of calendaring rolls (1, 2, 3, 4). The plurality of calendaring rolls (1, 2, 3, 4) are arranged in multiple stages adjacent to each other, and a stretching process may be performed as the electrode sheet (6) runs between each of the calendaring rolls (1, 2, 3, 4) arranged in multiple stages.

[0013] That is, as the electrode sheet (6) passes between the plurality of multi-stage calendering rolls (1, 2, 3, 4), the thickness of the electrode sheet (6) can be sequentially reduced. Accordingly, since the gap between the plurality of calendering rolls (1, 2, 3, 4) may be different depending on the thickness of the electrode sheet (6), the load applied to each of the plurality of calendering rolls (1, 2, 3, 4) may be different from each other. In general, since the gap between the plurality of calendering rolls (1, 2, 3, 4) is very small compared to the thickness of the electrode sheet (6) being input, a considerable load may be applied to each component of the electrode manufacturing device (10), and in severe cases, this may cause equipment failure or deterioration in the quality of the electrode. However, there was no adjustment in the design of each part, especially the housing, according to the size of the load applied to each of the plurality of calendaring rolls (1, 2, 3, 4), and thus there was a problem in that severe deformation occurred in the housing supporting the plurality of calendaring rolls (1, 2, 3, 4).

[0014] The problem to be solved by the present invention is to provide an electrode manufacturing device capable of improving deformation occurring in a housing supporting each calendaring roll.

[0015] However, the problems to be solved by the embodiments of the present invention are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0016] An electrode manufacturing device according to one embodiment of the present invention includes a plurality of calendering rolls arranged at predetermined intervals so that an electrode sheet is sequentially rolled, and a plurality of housings individually supporting a rotational axis of each of the plurality of calendering rolls, wherein an extension length of at least one housing among the plurality of housings with respect to the direction of travel of the electrode sheet may be different from the extension lengths of the remaining housings.

[0017] The extension length of at least one housing among the plurality of housings can be determined by the magnitude of the linear pressure exerted by the calendaring roll supported by the at least one housing.

[0018] The extension length of the first housing located at the uppermost end in the direction of progression of the electrode sheet among the plurality of housings can be determined regardless of the magnitude of the line pressure.

[0019] The extension length of the first housing among the plurality of housings may be longer than the extension length of any one of the remaining housings.

[0020] Among the plurality of housings, if the magnitude of the linear pressure by the second calendaring roll supported by one of the second housings is greater than the magnitude of the linear pressure by the third calendaring roll supported by another third housing among the remaining housings excluding the first housing, the extension length of the second housing may be smaller than the extension length of the third housing.

[0021] The third housing is located downstream of the second housing in the direction of travel, and the magnitude of the linear pressure exerted by the second calendaring roll may be greater than the magnitude of the linear pressure exerted by the third calendaring roll.

[0022] The magnitude of the linear pressure exerted by the above-mentioned plurality of calendaring rolls can be reduced toward the downstream of the above-mentioned direction of movement.

[0023] A trend value of data for the extension length of each of the plurality of housings and the magnitude of the linear pressure of each of the plurality of calendaring rolls is determined, and the extension length of each of the plurality of housings can be determined so that the extension length of each of the plurality of housings is within a predetermined range based on the trend value.

[0024] The extension length of each of the plurality of housings may be determined such that the sum of the extension lengths of each of the plurality of housings is within a certain range.

[0025] If at least one of the extension lengths of the plurality of housings is outside the predetermined range based on the trend value, the extension length of each of the plurality of housings may be determined again.

[0026] At least one of the plurality of calendaring rolls may be positioned off-center relative to the extended length of the housing supporting the calendaring roll.

[0027] The position at which the calendering roll is placed in the housing can be determined according to the diameter of the calendering roll, the gap between the calendering roll and an adjacent calendering roll, and the extension length of the housing.

[0028] The above electrode manufacturing device may further include a connecting member disposed between two adjacent housings among the plurality of housings.

[0029] Each of the plurality of housings may include a bearing portion formed between the housing and the rotating shaft.

[0030] The electrode manufacturing device according to embodiments of the present invention can improve deformation (i.e., distortion) occurring in a housing supporting each calendaring roll, while effectively arranging the calendaring roll and the housing within a limited space, thereby increasing space utilization.

[0031] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0032] Figure 1 is a schematic drawing of a conventional electrode manufacturing device.

[0033] FIG. 2 is a perspective view showing a battery manufacturing device according to one embodiment of the present invention.

[0034] Fig. 3 is a side view showing the side of the battery manufacturing device of Fig. 2.

[0035] Figure 4 is a schematic diagram showing the force applied to the battery manufacturing device of Figure 2.

[0036] FIG. 5 is a graph showing the relationship between the force applied to an electrode of a battery manufacturing device according to one embodiment of the present invention and the length of the housing.

[0037] FIG. 6 is a partially enlarged view illustrating deformation relief of a first bearing portion of a battery manufacturing device according to one embodiment of the present invention.

[0038] Figure 7 is a partially enlarged view illustrating deformation relief of a second bearing portion of a battery manufacturing device according to one embodiment of the present invention.

[0039] Figure 8 is a partially enlarged view illustrating deformation relief of a third bearing portion of a battery manufacturing device according to one embodiment of the present invention.

[0040] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0041] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0042] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0043] Furthermore, when we say that a layer, membrane, region, plate, or other part is "on" or "over" another part, this includes not only cases where it is "directly on" the other part, but also cases where there are other parts in between. Conversely, when we say that a part is "directly on" another part, it means that there are no other parts in between. Furthermore, saying that a part is "on" or "over" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "over" the direction opposite to gravity.

[0044] Additionally, terms indicating directions such as front, back, left, right, up, and down are used, but these terms are only for convenience of explanation and may vary depending on the location of the target object or the location of the observer.

[0045] Additionally, throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0046] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0047] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0048] Fig. 2 is a perspective view showing a battery manufacturing device according to one embodiment of the present invention. Fig. 3 is a side view showing a side of the battery manufacturing device of Fig. 2.

[0049] Referring to FIGS. 2 and 3, a battery manufacturing device (100) according to one embodiment of the present invention comprises a plurality of calendaring rolls (111, 112, 113, 114) arranged at predetermined intervals so that electrode sheets are sequentially rolled, a plurality of housings (131, 132, 133, 134) individually supporting the rotational shafts (121, 122, 123, 124) of each of the plurality of calendaring rolls (111, 112, 113, 114), a connecting member (151, 152, 153) disposed between two adjacent housings among the plurality of housings (131, 132, 133, 134), and a bearing part (141, 142) formed between each of the plurality of housings (131, 132, 133, 134) and the rotational shafts (121, 122, 123, 124). 142, 143, 144) may be included.

[0050] A plurality of calendaring rolls (111, 112, 113, 114) are generally cylindrical members. The plurality of calendaring rolls (111, 112, 113, 114) are rotatable about a rotation axis (121, 122, 123, 124). A dry electrode sheet (not shown) may be stretched as it runs between the plurality of calendaring rolls (111, 112, 113, 114). The thickness of the electrode sheet may be determined by the spacing between adjacent calendaring rolls, etc. That is, the narrower the spacing between the calendaring rolls, the thinner the electrode sheet may be.

[0051] Meanwhile, in the examples illustrated in FIGS. 1 and 2, the number of the plurality of calendaring rolls (111, 112, 113, 114) and the accompanying components is illustrated as being four, and the following description will also be based on this, but the number of the plurality of calendaring rolls and the accompanying components may be variously modified or changed depending on the environment in which the present invention is implemented.

[0052] In addition, for the convenience of explanation, the plurality of calendaring rolls and their accompanying components are distinguished by ordinal numbers such as first, second, third, and fourth from upstream to downstream in the direction of travel of the electrode sheet, but this is used for the purpose of distinguishing one of the plurality of components from the rest, and is not used to limit the components by such terms.

[0053] The rotating shafts (121, 122, 123, 124) may be formed by protruding from both ends of the plurality of calendaring rolls (111, 112, 113, 114). Meanwhile, a driving means (not shown) for rotating each of the rotating shafts (121, 122, 123, 124) may be connected. Power is transmitted from the driving means to each of the rotating shafts (121, 122, 123, 124), so that the calendaring rolls (111, 112, 113, 114) connected to the rotating shafts (121, 122, 123, 124) can rotate. At this time, each calendaring roll (111, 112, 113, 114) can be rotated independently of each other.

[0054] A plurality of housings (131, 132, 133, 134) may be individually formed to support each of the plurality of calendaring rolls (111, 112, 113, 114). That is, a pair of housings (131, 132, 133, 134) may each support a rotational shaft (121, 122, 123, 124) extending from both ends of one calendaring roll (111, 112, 113, 114). In an embodiment of the present invention, the plurality of housings (131, 132, 133, 134) have an approximately rectangular shape, but the shapes of the plurality of housings (131, 132, 133, 134) may be variously modified or changed depending on the environment in which the present invention is implemented. Meanwhile, in the following description, the plurality of housings (131, 132, 133, 134) will be described based on the case where they are rectangular in shape, and a specific description of the plurality of housings (131, 132, 133, 134) will be provided later.

[0055] The connecting members (151, 152, 153) are arranged between two adjacent housings among the plurality of housings (131, 132, 133, 134) to adjust the gap between the two adjacent calendaring rolls. In addition, the connecting members (151, 152, 153) can transmit force to the adjacent housings. Meanwhile, the plurality of housings (131, 132, 133, 134) may have grooves (not shown) formed to accommodate the connecting members (151, 152, 153).

[0056] The bearing parts (141, 142, 143, 144) are arranged in the openings of the plurality of housings (131, 132, 133, 134) through which the respective rotary shafts (121, 122, 123, 124) pass, and can support the self-weight of each rotary shaft (121, 122, 123, 124) and the load applied to the rotary shafts. The friction between the rotary shafts (121, 122, 123, 124) and the housings (131, 132, 133, 134) is reduced by the bearing parts (141, 142, 143, 144), so that the plurality of calendaring rolls (111, 112, 113, 114) can rotate smoothly. At this time, the type of bearing part (141, 142, 143, 144) may be modified or changed in various ways depending on the environment in which the present invention is implemented.

[0057] The extension length (L) of the electrode sheet of at least one of the plurality of housings (131, 132, 133, 134) in the advancing direction may be different from the extension lengths of the remaining housings. For example, the extension length (L1) of the first housing (131) may be different from the extension lengths (L2, L3, L4) of the remaining housings (132, 133, 134). Alternatively, the extension lengths (L1, L2, L3, L4) of each of the plurality of housings (131, 132, 133, 134) may be different from each other. However, the extension lengths (L1, L2, L3, L4) of each of the plurality of housings (131, 132, 133, 134) are not limited to the above-described examples, and may be variously modified or changed depending on the environment in which the present invention is implemented, as described below.

[0058] Specifically, the extension length of at least one housing among the plurality of housings (131, 132, 133, 134) can be determined by the magnitude of the linear pressure by the calendaring roll supported by the at least one housing. In general, the plurality of calendaring rolls (111, 112, 113, 114) can roll the electrode sheet to produce it in a thin form, and the linear pressure means a value obtained by dividing the pressure (or force) applied to the electrode sheet by the plurality of calendaring rolls (111, 112, 113, 114) by the contact length (width) of the calendaring rolls (111, 112, 113, 114).

[0059] The load applied to each of the plurality of housings (131, 132, 133, 134) is affected by the linear pressure applied to the electrode sheet by the calendaring rolls (111, 112, 113, 114) supported by each of the housings (131, 132, 133, 134). Therefore, by determining the extension length of the housings (131, 132, 133, 134) according to the load applied to each of the housings (131, 132, 133, 134) (i.e., the linear pressure of the calendaring roll), it is possible to improve the deformation (i.e., distortion) occurring in each of the housings (131, 132, 133, 134).

[0060] First, the extension length (L1) of the first housing (131) located at the uppermost end in the direction of travel among the plurality of housings (131, 132, 133, 134) can be determined regardless of the magnitude of the linear pressure. For example, the extension length (L1) of the first housing (131) among the plurality of housings (131, 132, 133, 134) can be longer than the extension length of any one of the remaining housings (132, 133, 134). That is, the extension length (L1) of the first housing (131) among the plurality of housings (131, 132, 133, 134) can be the longest.

[0061] Among the plurality of housings (131, 132, 133, 134), if the magnitude of the linear pressure by the second calendaring roll supported by one of the second housings among the remaining housings (132, 133, 134) excluding the first housing (131) is greater than the magnitude of the linear pressure by the third calendaring roll supported by the other third housing, the extension length of the second housing may be smaller than the extension length of the third housing. Meanwhile, the second housing, the third housing, the second calendaring roll, and the third calendaring roll described above are used for the purpose of distinguishing one of the plurality of components from the rest, and do not refer to the second housing (132), the third housing (133), the second calendaring roll (112), and the third calendaring roll (113) illustrated in FIGS. 2 and 3, unless otherwise indicated by a drawing reference numeral.

[0062] For example, when the linear pressure of the second calendaring roll (112) is greater than the linear pressure of the third calendaring roll (113), the extension length (L2) of the second housing (132) is shorter than the extension length of the third housing (133). Conversely, when the linear pressure of the third calendaring roll (113) is greater than the linear pressure of the second calendaring roll (112), the extension length (L3) of the third housing (133) is shorter than the extension length of the second housing (132). As another example, when the linear pressure of the second calendaring roll (112) is greater than the linear pressure of the fourth calendaring roll (114), the extension length (L2) of the second housing (132) is shorter than the extension length (L4) of the fourth housing (134). That is, the extension lengths (L2, L3, L4) of the second to fourth housings (132, 133, 134) can be determined according to the magnitude of the linear pressure of each of the second to fourth calendaring rolls (112, 113, 114).

[0063] At this time, the third housing is located downstream of the second housing in the above-described direction of travel, and the magnitude of the linear pressure by the second calendaring roll may be greater than the magnitude of the linear pressure by the third calendaring roll. Similarly, the second housing, the third housing, the second calendaring roll, and the third calendaring roll described above are used for the purpose of distinguishing one of the plurality of components from the rest, and do not refer to the second housing (132), the third housing (133), the second calendaring roll (112), and the third calendaring roll (113) illustrated in FIGS. 2 and 3, unless otherwise indicated by a drawing reference numeral.

[0064] For example, the third housing (133) is located downstream in the direction of travel of the second housing (132), and in this case, the magnitude of the linear pressure of the second calendaring roll (112) is greater than the magnitude of the linear pressure of the third calendaring roll (113), and accordingly, the extension length (L2) of the second housing (132) is shorter than the extension length (L3) of the third housing (133). In addition, the fourth housing (134) is located downstream in the direction of travel of the second housing (132), and in this case, the magnitude of the linear pressure of the second calendaring roll (112) is greater than the magnitude of the linear pressure of the fourth calendaring roll (114), and accordingly, the extension length (L2) of the second housing (132) is shorter than the extension length (L4) of the fourth housing (134). In addition, the fourth housing (134) is located downstream in the progress direction from the third housing (133), and in this case, the magnitude of the linear pressure of the third calendaring roll (113) is greater than the magnitude of the linear pressure of the fourth calendaring roll (114), and accordingly, the extension length (L3) of the third housing (133) is shorter than the extension length (L4) of the fourth housing (134). That is, among the second to fourth calendaring rolls (112, 113, 114), the linear pressure of the calendaring roll located downstream in the progress direction is smaller than the linear pressure of the calendaring roll located downstream in the progress direction, and accordingly, the extension length of the housing can be determined according to the magnitude of the linear pressure of each calendaring roll.

[0065] The magnitude of the linear pressure by the plurality of calendaring rolls (111, 112, 113, 114) may decrease toward the downstream in the direction of travel. For example, the magnitude of the linear pressure by the second calendaring roll (112) is greater than the magnitude of the linear pressure by the third calendaring roll (113), and the magnitude of the linear pressure by the third calendaring roll (113) is greater than the magnitude of the linear pressure by the fourth calendaring roll (114). Accordingly, the extension length (L2) of the second housing (132) may be shorter than the extension length (L3) of the third housing (133), and the extension length (L3) of the third housing (133) may be shorter than the extension length (L4) of the fourth housing (134).

[0066] At least one of the plurality of calendaring rolls (111, 112, 113, 114) may be positioned off-center based on the extension length of the housing supporting the calendaring roll. If the plurality of calendaring rolls (111, 112, 113, 114) are positioned at the center based on the extension length of the plurality of housings (131, 132, 133, 134), the extension lengths of each of the plurality of housings (131, 132, 133, 134) may be different from each other, and therefore the diameters of the plurality of calendaring rolls (111, 112, 113, 114) must also be different from each other. In general, since the diameters of the plurality of calendaring rolls (111, 112, 113, 114) are the same, it is preferable that at least one of the plurality of calendaring rolls (111, 112, 113, 114) be arranged off-center based on the extension length of the housing supporting the calendaring roll.

[0067] For example, when the extension length of the first housing (131) is the longest among the plurality of housings (131, 132, 133, 134), the first calendaring roll (111) connected to the first housing (131) may be arranged to be offset from the center of the first housing (131) toward the second housing (132). That is, the position at which each calendaring roll (111, 112, 113, 114) is placed in each housing (131, 132, 133, 134) is determined according to the diameter of each calendaring roll (111, 112, 113, 114), the gap between each calendaring roll (111, 112, 113, 114), and the extension length of each housing (131, 132, 133, 134), and may be variously modified or changed depending on the environment in which the present invention is implemented.

[0068] Figure 4 is a schematic diagram showing the force applied to the battery manufacturing device of Figure 2.

[0069] Referring to Fig. 4, there is a line pressure (F) between each calendaring roll (111, 112, 113, 114). ij ) is acting, and each housing (131, 132, 133, 134) has a reaction force (N) due to each rotation axis (121, 122, 123, 124) i or N ij ) is in effect. Here, the line pressure (F ij ) refers to the force applied to each calendaring roll by the electrode sheet passing between the ith calendaring roll and the jth calendaring roll based on the direction of travel, and the reaction force (N i ) represents the force acting on the i-th housing, and the reaction force (N ij ) represents the force acting between the ith housing and the jth housing, and i and j represent natural numbers greater than or equal to 1.

[0070] Based on the force shown in Figure 4, when establishing a force balance relationship, it is as shown in the following mathematical expression 1.

[0071] [Mathematical Formula 1]

[0072] N1=N 12 +F 12 =N 23 +F 23 =N 34 +F 34 =N4

[0073] As described above, the magnitude of the linear pressure by the multiple calendaring rolls (111, 112, 113, 114) can be reduced toward the downstream of the forward direction. That is, F 12 >F 23 >F 34 , and in order to satisfy the relationship of mathematical expression 1 above, N 12 <N 23 <N 34 The result can be derived. At this time, the reaction force (N i or N ij ) is the respective housings (131, 132, 133, 134), and more specifically, the bearing portions (141, 142, 143, 144) of each housing (131, 132, 133, 134). Therefore, in order to minimize the deformation of this portion, the reaction force (N i or N ij ) forms a large housing in which the force exerts a large force, and the reaction force (N i or N ij ) can form a housing that acts small. Through this, the electrode manufacturing device (100) according to one embodiment of the present invention can improve deformation (i.e., distortion) occurring in each housing (131, 132, 133, 134), and at the same time, can effectively arrange the calendaring rolls (111, 112, 113, 114) and the housings (131, 132, 133, 134) within a limited space, thereby increasing space utilization.

[0074] FIG. 5 is a graph showing the relationship between the force applied to an electrode of a battery manufacturing device according to one embodiment of the present invention and the length of the housing.

[0075] Referring to FIG. 5, the trend values ​​of data for the extension lengths (L1, L2, L3, L4) of each of the plurality of housings (131, 132, 133, 134) and the magnitude of the line pressure of each of the plurality of calendaring rolls (111, 112, 113, 114) are determined, and based on the trend values, the extension lengths (L1, L2, L3, L4) of each of the plurality of housings (131, 132, 133, 134) can be determined so that the extension lengths (L1, L2, L3, L4) of each of the plurality of housings (131, 132, 133, 134) are within a predetermined range.

[0076] At this time, the extension lengths (L1, L2, L3, L4) of each of the plurality of housings (131, 132, 133, 134) can be determined so that the sum of the extension lengths (L1, L2, L3, L4) of each of the plurality of housings (131, 132, 133, 134) is within a certain range.

[0077] The graph shown in Fig. 5 shows that the magnitude of the linear pressure by the multiple calendaring rolls (111, 112, 113, 114) decreases toward the downstream of the direction of travel, i.e., the linear pressure (F 12 ) > Line pressure (F) 23 ) > Line pressure (F) 34), the extension lengths (L1, L2, L3, L4) of the plurality of housings (131, 132, 133, 134) are shown. At this time, the relationship of the extension length (L1) of the first housing (131) > the extension length (L4) of the fourth housing (134) > the extension length (L3) of the third housing (133) > the extension length (L2) of the second housing (132) is shown. The magnitude of the line pressure by the plurality of calendaring rolls (111, 112, 113, 114) and the trend value by the extension lengths (L1, L2, L3, L4) of the plurality of housings (131, 132, 133, 134) can be represented as a dotted line graph shown in FIG. 5. At this time, each of the extension lengths (L1, L2, L3, L4) of the plurality of housings (131, 132, 133, 134) can be determined to be located within a predetermined range of the trend value (dotted line graph of FIG. 5).

[0078] For example, the pressure (F 12 )=14ton·f, line pressure (F) 23 )=10ton·f, line pressure (F) 34 )=5ton·f, and when the sum of the extension lengths (L1, L2, L3, L4) of the plurality of housings (131, 132, 133, 134) is 1000mm, the extension lengths (L1, L2, L3, L4) of each of the plurality of housings (131, 132, 133, 134) can be determined as L1=280mm, L2=220mm, L3=230mm, L4=270mm. Meanwhile, the above-described numerical values ​​are arbitrary values ​​for explaining the present invention, and may be variously modified or changed depending on the environment in which the present invention is implemented.

[0079] If at least one of the extension lengths (L1, L2, L3, L4) of the plurality of housings (131, 132, 133, 134) deviates from a predetermined range based on the above-described trend value, the extension lengths (L1, L2, L3, L4) of each of the plurality of housings (131, 132, 133, 134) may be re-determined. In this case, the above-described trend value may be re-determined according to the re-determined extension lengths (L1, L2, L3, L4) of each of the plurality of housings (131, 132, 133, 134).

[0080] Fig. 6 is a partially enlarged view illustrating strain relief of a first bearing portion of a battery manufacturing device according to an embodiment of the present invention. Fig. 7 is a partially enlarged view illustrating strain relief of a second bearing portion of a battery manufacturing device according to an embodiment of the present invention. Fig. 8 is a partially enlarged view illustrating strain relief of a third bearing portion of a battery manufacturing device according to an embodiment of the present invention.

[0081] FIGS. 6 to 8 respectively show simulation results of deformation (distortion) occurring in the first to third bearing parts (141, 142, 143) when the extension lengths of the plurality of housings (131, 132, 133, 134) supporting the respective calendaring rolls (111, 112, 113, 114) are the same. In addition, enlarged portions of A to D in FIGS. 6 to 8 respectively show simulation results of deformation (distortion) occurring in the first to third bearing parts (141, 142, 143) of the battery manufacturing device (100) according to one embodiment of the present invention.

[0082] As shown in Fig. 6, in the first bearing portion (141), deformation (distortion) occurs severely in portions A and B. On the other hand, deformation (distortion) is alleviated in the enlarged portions of A and B.

[0083] Similarly, as shown in FIGS. 7 and 8, in the second bearing part (142), severe deformation (distortion) occurs in the C portion, and in the third bearing part (143), severe deformation (distortion) occurs in the D portion. On the other hand, deformation (distortion) is alleviated in the enlarged portion of C and the enlarged portion of D, respectively.

[0084] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0085] [Explanation of symbols]

[0086] 100: Electrode manufacturing device

[0087] 111, 112, 113, 114: Multiple calendaring rolls

[0088] 121, 122, 123, 124: Multiple axes of rotation

[0089] 131, 132, 133, 134: Multiple housings

[0090] 141, 142, 143, 144: Multiple bearing parts

[0091] 151, 152, 153: Multiple connecting elements

Claims

1. A plurality of calendaring rolls arranged at predetermined intervals so that electrode sheets are rolled sequentially; and It includes a plurality of housings that individually support the rotational axis of each of the plurality of calendaring rolls, An electrode manufacturing device, wherein the extension length of the electrode sheet of at least one housing among the plurality of housings in the advancing direction is different from the extension length of the remaining housings.

2. In paragraph 1, An electrode manufacturing device, wherein the extension length of at least one housing among the plurality of housings is determined by the magnitude of the linear pressure applied by the calendaring roll supported by the at least one housing.

3. In paragraph 2, An electrode manufacturing device, wherein the extension length of the first housing located at the uppermost end in the direction of progression of the electrode sheet among the plurality of housings is determined regardless of the magnitude of the line pressure.

4. In paragraph 3, An electrode manufacturing device, wherein the extension length of the first housing among the plurality of housings is longer than the extension length of any one of the remaining housings.

5. In paragraph 3, An electrode manufacturing device, wherein, among the plurality of housings, excluding the first housing, if the magnitude of the linear pressure by the second calendaring roll supported by one of the second housings is greater than the magnitude of the linear pressure by the third calendaring roll supported by another third housing, the extension length of the second housing is smaller than the extension length of the third housing.

6. In paragraph 5, The third housing is located downstream of the second housing in the direction of travel, An electrode manufacturing device, wherein the magnitude of the linear pressure applied by the second calendaring roll is greater than the magnitude of the linear pressure applied by the third calendaring roll.

7. In paragraph 6, An electrode manufacturing device, wherein the magnitude of the linear pressure applied by the plurality of calendaring rolls decreases toward the downstream of the moving direction.

8. In paragraph 5, The trend value of data for the extension length of each of the plurality of housings and the magnitude of the linear pressure of each of the plurality of calendaring rolls is determined, An electrode manufacturing device, wherein the extension length of each of the plurality of housings is determined so that the extension length of each of the plurality of housings is within a predetermined range based on the trend value.

9. In paragraph 8, An electrode manufacturing device, wherein the extension length of each of the plurality of housings is determined so that the sum of the extension lengths of each of the plurality of housings is within a certain range.

10. In paragraph 9, An electrode manufacturing device, wherein when at least one of the extension lengths of the plurality of housings is outside the predetermined range based on the trend value, the extension length of each of the plurality of housings is determined again.

11. In paragraph 1, An electrode manufacturing device, wherein at least one of the plurality of calendaring rolls is positioned off-center based on the extended length of the housing supporting the calendaring roll.

12. In paragraph 9, An electrode manufacturing device, wherein the position at which the calendering roll is placed in the housing is determined according to the diameter of the calendering roll, the gap between the calendering roll and an adjacent calendering roll, and the extension length of the housing.

13. In paragraph 1, An electrode manufacturing device further comprising a connecting member disposed between two adjacent housings among the plurality of housings.

14. In paragraph 1, An electrode manufacturing device, wherein each of the plurality of housings includes a bearing part formed between the rotating shaft and the housing.

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