Apparatus for manufacturing electrode

Abstract

An electrode manufacturing apparatus according to an embodiment of the present invention may comprise: a plurality of calendering rolls arranged at predetermined intervals so that electrode sheets are sequentially rolled; a plurality of housings having openings formed to individually support the rotation axis of the plurality of calendering rolls, respectively; and a plurality of connection members disposed between two adjacent housings among the plurality of housings so as to contact two adjacent housings, respectively. The connection members may include a curved portion formed on one side facing one of the two adjacent 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. 10-2024-0094922, filed July 18, 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. In general, 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 fed, so that a considerable external force may be applied to each component of the electrode manufacturing device (10), and in severe cases, this may cause equipment failure or deterioration of the electrode quality. In particular, there is a problem that deformation of each component may occur due to the external force applied to each component, which may act as an obstacle to accurately controlling the gap between the plurality of calendering 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, a plurality of housings each having an opening formed therein for individually supporting a rotational axis of each of the plurality of calendering rolls, and a plurality of connecting members arranged between two adjacent housings among the plurality of housings and each of which contacts the two adjacent housings, wherein the connecting members may include a curved portion formed on one side facing one of the two adjacent housings.

[0017] The plurality of housings may include a receiving groove that receives the curved portion of the connecting member.

[0018] The surface of the above-mentioned receiving groove can be formed into a shape corresponding to the curved shape of the above-mentioned curved portion.

[0019] The above-mentioned curved portion may be convex toward the one side, and the receiving groove may be concave to receive the above-mentioned curved portion.

[0020] When the above connecting member is accommodated in the housing, the center of the opening can be located on a straight line connecting the center of curvature of the curved portion to the center of the accommodation groove.

[0021] The radius of curvature of the curved portion and the length of the curved portion are determined by the length of the housing in the width direction, the length of the housing in the height direction, and the diameter of the opening, and the width direction of the housing is a direction parallel to the direction from one side toward the other side of the two adjacent housings, and the height direction can be orthogonal to the width direction.

[0022] The radius of curvature of the above-mentioned curved portion and the surface length of the above-mentioned curved portion can be derived from the following mathematical expressions 1 to 3.

[0023] [Mathematical Formula 1]

[0024]

[0025] Here, R is the radius of curvature of the curved portion, θ is half of the angle formed by the curved portion based on the center of curvature of the curved portion, L is the length in the width direction of the housing, and D is the diameter of the opening.

[0026] [Equation 2]

[0027]

[0028] Here, R is the radius of curvature of the curved portion, θ is half of the angle formed by the curved portion based on the center of curvature of the curved portion, and H is the length in the height direction of the housing.

[0029] [Equation 3]

[0030]

[0031] Here, l is the surface length of the curved portion, R is the radius of curvature of the curved portion, and θ is half of the angle formed by the curved portion with respect to the center of curvature of the curved portion.

[0032] The above connecting member may further include a main body portion disposed on the other side facing the other of the two adjacent housings, and a connecting portion disposed between the main body portion and the curved portion to support the curved portion.

[0033] The above connecting member may further include a support member arranged on the other side of the main body portion and in contact with the other one of the two adjacent housings.

[0034] The above curved portion can slide relative to the main body portion.

[0035] Either of the above-mentioned curved portion and the above-mentioned main body portion may include a guide groove formed in a surface of each of the opposing surfaces, and the connecting portion may include a guide protrusion inserted into the guide groove and capable of sliding along the guide groove.

[0036] The above guide home can extend along a height direction perpendicular to the direction from one side to the other side.

[0037] The direction in which the curved portion slides is inclined with respect to the surface of the other of the two adjacent housings, and the gap between the two adjacent housings can be adjusted according to the sliding movement of the curved portion.

[0038] The position of the curved portion with respect to the main body can be fixed by an external force applied from two adjacent housings after the slide movement with respect to the main body is completed.

[0039] The electrode manufacturing device may further include a bearing part disposed in the opening and supporting the rotational shaft.

[0040] 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.

[0041] 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.

[0042] Figure 1 is a schematic drawing of a conventional electrode manufacturing device.

[0043] FIG. 2 is a perspective view showing a battery manufacturing device according to one embodiment of the present invention.

[0044] Fig. 3 is a side view showing the side of the battery manufacturing device of Fig. 2.

[0045] Figure 4 is a perspective view of the connecting member illustrated in Figure 3.

[0046] Figure 5 is a side view of the connecting member illustrated in Figure 4.

[0047] Figure 6 is a perspective view showing the main body part omitted to explain the sliding movement of the curved part.

[0048] Figure 7 is a perspective view showing the curved portion omitted to explain the sliding movement of the curved portion.

[0049] Figure 8 is a drawing showing a connecting member inserted into a housing to explain the shape of the curved portion of the connecting member.

[0050] FIG. 9 is a drawing for explaining deformation relief of a plurality of housings of a battery manufacturing device according to one embodiment of the present invention.

[0051] FIG. 10 is a drawing for explaining deformation relief of a second bearing part of a battery manufacturing device according to one embodiment of the present invention.

[0052] FIG. 11 is a drawing for explaining deformation relief of a third bearing part of a battery manufacturing device according to one embodiment of the present invention.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0061] 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.

[0062] Referring to FIGS. 2 and 3, a battery manufacturing device (100) according to one embodiment of the present invention may include a plurality of calendaring rolls (110) arranged at predetermined intervals so that electrode sheets are sequentially rolled, a plurality of housings (130) individually supporting a rotational shaft (120) of each of the plurality of calendaring rolls (110), a plurality of bearing parts (140) arranged in openings (136) of the plurality of housings (130) to support the rotational shaft (120), and a plurality of connecting members (150) arranged between two adjacent housings among the plurality of housings (130) to contact the two adjacent housings, respectively.

[0063] A plurality of calendaring rolls (110) are generally cylindrical members. The plurality of calendaring rolls (110) are rotatable about a rotation axis (120). A dry electrode sheet (not shown) may be stretched as it travels between the plurality of calendaring rolls (110). 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.

[0064] Meanwhile, in the examples illustrated in FIGS. 1 and 2, the number of the plurality of calendaring rolls (111, 112, 113, 114) and their accompanying components is illustrated as four, and are referred to as a first calendaring roll (111), a second calendaring roll (112), a third calendaring roll (113), and a fourth calendaring roll (114) from upstream to downstream based on the direction of travel of the electrode sheet. The following description will also be based on this, but the number of the plurality of calendaring rolls and their accompanying components may be variously modified or changed depending on the environment in which the present invention is implemented.

[0065] 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.

[0066] The rotation shaft (120) may be formed by protruding from each end of a plurality of calendaring rolls (110). Meanwhile, a driving means (not shown) for rotating each of the rotation shafts (121, 122, 123, 124) may be connected. Power is transmitted from the driving means to each of the rotation shafts (121, 122, 123, 124), so that the calendaring rolls (111, 112, 113, 114) connected to the rotation shafts (121, 122, 123, 124) can rotate. At this time, each of the calendaring rolls (111, 112, 113, 114) can be independently driven to rotate.

[0067] A plurality of housings (130) may be individually formed to support each of the plurality of calendering rolls (110). That is, a pair of housings (130) may each support a rotational shaft (120) extending from both ends of one calendering roll (110). For example, a pair of first housings (131) each support a first rotational shaft (121) extending from both ends of the first calendering roll (111). In the embodiment of the present invention, the plurality of housings (130) have a roughly rectangular shape, but the shapes of the plurality of housings (130) may be variously modified or changed depending on the environment in which the present invention is implemented. Meanwhile, the following description will be made based on the case where the plurality of housings (130) have a rectangular shape.

[0068] The bearing part (140) is arranged in the opening (136) of the plurality of housings (130) through which each of the rotation shafts (120) passes, and can support the weight of each of the rotation shafts (120) and the load applied to the rotation shafts. Friction between the rotation shafts (120) and the housings (130) is reduced by the bearing part (140), so that the plurality of calendaring rolls (110) can rotate smoothly. At this time, the type of the bearing part (140) can be variously modified or changed depending on the environment in which the present invention is implemented.

[0069] The connecting member (150) is positioned between two adjacent housings among a plurality of housings (130) and contacts the two adjacent housings (130), respectively. Accordingly, the connecting member (150) can adjust the gap between the two adjacent calendaring rolls (110). In addition, the connecting member (150) can transmit force to the adjacent housings (130). Meanwhile, a detailed description of the connecting member (150) will be provided later.

[0070] Fig. 4 is a perspective view of the connecting member illustrated in Fig. 3. Fig. 5 is a side view of the connecting member illustrated in Fig. 4. Fig. 6 is a perspective view in which the main body portion is omitted in order to explain the sliding movement of the curved portion. Fig. 7 is a perspective view in which the curved portion is omitted in order to explain the sliding movement of the curved portion. Fig. 8 is a drawing in which the connecting member is inserted into the housing in order to explain the shape of the curved portion of the connecting member.

[0071] Referring to FIGS. 4 to 8, the connecting member (150) may include a curved portion (156) formed on one side facing one of the two adjacent housings.

[0072] In general, in the electrode calendering process, a plurality of calendering rolls (110) can roll an electrode sheet to produce a thin form, and a very high linear pressure is required to improve the energy density of the electrode. In particular, the smaller the active material particle size, the greater the linear pressure is required for the electrode material. At this time, the linear pressure means a value obtained by dividing the pressure (or force) applied to the electrode sheet by the plurality of calendering rolls (110) by the contact length (width) of the calendering rolls (110). Since a very large linear pressure is required, a significant external force may be applied to the housing (131, 132, 133, 134), bearing portion (141, 142, 143, 144), connecting members (151, 152, 153), etc. of the electrode manufacturing device (100), causing deformation, which may act as an obstacle to accurately controlling the gap between the plurality of calendering rolls (111, 112, 113, 114).

[0073] The connecting member (150) is arranged between two adjacent housings (130), and thus transmits force from one housing (130) to the adjacent housing (130). In addition, the connecting member (150) can adjust the gap between the plurality of calendaring rolls (110). Since the connecting member (150) transmits force to the adjacent housings (130) and maintains the gap between the plurality of calendaring rolls (110), the connecting member (150) can be formed of a metal having excellent tensile strength, ductility, and wear resistance. For example, the connecting member (150) can be formed of a metal having a high elastic modulus, and as an example of a metal having a high elastic modulus, it can be formed of carbon steel, mainly S45C.

[0074] As shown in the example in FIG. 8, the housing (130) may include a receiving groove (137) that receives the curved portion (156) of the connecting member (150). The surface of the receiving groove (137) may be formed in a shape corresponding to the curved shape of the curved portion (156). For example, the curved portion (156) of the connecting member (150) may be convex toward the housing (130) that receives the curved portion (156), and the receiving groove (137) of the housing (130) may be concave to receive the curved portion (156).

[0075] In the electrode manufacturing device (100) according to an embodiment of the present invention, the connecting member (150) includes a curved portion (156) in which one surface that comes into contact with the housing (130) is formed as a curved surface, so that it can have a wider area compared to a case where it is simply formed as a flat surface under the same pre-pressure conditions, and an external force applied to the curved portion (156) of the connecting member (150) can be effectively distributed over the entire curved portion (156). Accordingly, a smaller stress is applied to the curved portion (156) compared to a case where the connecting member (150) comes into contact with the housing (130) as a flat surface. As a result, the deformation applied to each component of the electrode manufacturing device (100) (e.g., the housing (130), the bearing portion (140), etc.) can be reduced. This deformation reduction is very important in the electrode calendering process, which requires precise control of the gap between calendering rolls (110) of a very small size (e.g., within several μm).

[0076] In addition, since the housing (130) can withstand greater line pressure by the connecting member (150) according to the embodiment of the present invention, the durability of the electrode manufacturing device (100) can be improved, and it is advantageous for achieving high energy density of the electrode.

[0077] As shown in the example in Fig. 8, an opening (136) is formed in the housing (130) to accommodate a rotating shaft (120) connected to a calendering roll (110). During the stretching process, a force is transmitted from the rotating shaft (120) connected to the calendering roll (110) to the housing (130), and the connecting member (150) transmits the force to the adjacent housing (130). Therefore, a large force is applied to the area between the opening (136) and the connecting member (150) on the housing (130). If the connecting member (150) is positioned to be biased to one side with respect to the opening (136), a problem may arise in which an external force is concentrated on a part of the connecting member (150).

[0078] In order to prevent the problem of external force being concentrated on a portion of the connecting member (150), the connecting member (150) may be arranged symmetrically with respect to the opening (136) of the housing (130). That is, when the connecting member (150) is accommodated in the housing (130), the center of the opening (136) of the housing (130) may be located on a straight line connecting the center of curvature of the curved portion (156) of the connecting member (150) to the center of the receiving groove (137). Accordingly, the external force applied to the curved portion (156) of the connecting member (150) may be effectively distributed over the entire curved portion (156).

[0079] The radius of curvature of the curved portion (156) and the length of the curved portion (156) can be determined by the length (L) in the width direction of the housing (130), the length (H) in the height direction of the housing (130), and the diameter (D) of the opening (136). At this time, the width direction of the housing (130) is a direction parallel to the direction from one side to the other side, and the height direction means a direction orthogonal to the width direction.

[0080] Specifically, the radius of curvature (R) of the curved portion (156) and the length (l) of the curved portion (156) can be derived from the following mathematical expressions 1 to 3.

[0081] [Mathematical Formula 1]

[0082]

[0083] Here, R is the radius of curvature of the curved portion (156), θ is half of the angle formed by the curved portion (156) based on the center of curvature of the curved portion (156), L is the length in the width direction of the housing (130), and D is the diameter of the opening (136) of the housing (130).

[0084] [Equation 2]

[0085]

[0086] Here, R is the radius of curvature of the curved portion (156), θ is half of the angle formed by the curved portion (156) based on the center of curvature of the curved portion (156), and H is the length in the height direction of the housing (130).

[0087] [Equation 3]

[0088]

[0089] Here, l is the surface length of the curved portion (156), R is the radius of curvature of the curved portion (156), and θ is half of the angle formed by the curved portion (156) based on the center of curvature of the curved portion (156).

[0090] By determining the radius of curvature of the curved portion (156) and the length of the curved portion (156) according to the above mathematical expressions 1 to 3, the external force applied to the curved portion (156) can be effectively distributed throughout the entire curved portion (156). Accordingly, the deformation (i.e., distortion) occurring in each housing (130) and bearing portion (140) can be improved.

[0091] Referring again to FIGS. 4 and 5, the connecting member (150) may include a curved portion (156) formed on one side facing one of the two adjacent housings, a main body portion (157) disposed on the other side facing the other of the two adjacent housings, a connecting portion (158) disposed between the main body portion (157) and the curved portion (156) to support the curved portion (156), and a supporting portion (159) disposed on the other side of the main body portion to contact the other of the two adjacent housings. Specifically, the curved portion (156) may be formed on one side (157a) of the main body portion (157), and the supporting portion (159) may be formed on the other side (157b) of the main body portion (157).

[0092] The curved portion (156) is slidable relative to the main body (157). As an example, the curved portion (156) is supported by the connecting portion (158), and the connecting portion (158) can be fixed and supported on the main body (157). At this time, the curved portion (156) is slidable relative to the connecting portion (158). As another example, the connecting portion (158) is fixed to the curved portion (156) to support the curved portion (156), and the connecting portion (158) can be slidably supported on the main body (157).

[0093] More specifically, either the curved portion (156) or the main body portion (157) may include a guide groove formed in a recess in one of the respective surfaces facing each other.

[0094] As shown in an example in FIGS. 6 and 7, the curved portion (156) may include a guide groove (156g) that is formed recessed in a surface facing the other side. At this time, the guide groove (156g) may be formed to extend in the height direction. The connecting portion (158) may include a guide protrusion (159) that is inserted into the guide groove (156g). The guide protrusion (159) is inserted into the guide groove (156g) and is slidable in the height direction along the guide groove (156g). Therefore, the curved portion (156) is slidably supported by the connecting portion (158), and the connecting portion (158) is fixedly supported by the main body (157), so that the curved portion (156) is slidable with respect to the main body (157).

[0095] As another example, although not shown in the drawing, the main body (157) may include a guide groove that is formed recessed on one side (157a) and extends in the height direction. Similarly, the connecting portion (158) includes a guide protrusion (159) that is inserted into the guide groove, and the guide protrusion (159) is inserted into the guide groove and is slidable in the height direction along the guide groove. In the other example, the curved portion (156) is fixedly supported by the connecting portion (158), and the connecting portion (158) is slidably supported on the main body (157), so that the curved portion (156) is slidable with respect to the main body (157).

[0096] At this time, the direction in which the curved portion (156) slides is inclined with respect to the surface of the other of the two adjacent housings (130), and the gap between the two adjacent housings (130) can be adjusted according to the sliding movement of the curved portion (156). Although not illustrated in detail in FIG. 5, one side (157a) of the main body (157) can be slightly inclined with respect to the other side (157b), and the surface of the connecting portion (158) that comes into contact with the curved portion (156) can also be slightly inclined like the one side (157a) of the main body (157). Since the curved portion (156) slides along the slightly inclined surface of the connecting portion (158), as a result, the curved portion (156) can slide along the one side (157a) of the main body (157). That is, the curved portion (156) can slide while being slightly inclined with respect to the other side (157b) of the main body portion (157). Accordingly, as the curved portion (156) slides with respect to the main body portion (157), the gap between two adjacent housings (130) can be adjusted.

[0097] For example, in the example illustrated in FIG. 5, when one side (157a) of the main body (157) is inclined so as to be closer to the other side (157b) as it faces upward, the gap between the two adjacent housings (130) may decrease when the curved part (156) slides upward with respect to the main body (157). Conversely, when the curved part (156) slides downward with respect to the main body (157), the gap between the two adjacent housings (130) may increase. However, the direction in which the one side (157a) of the main body (157) is inclined is not limited by the above-described method, and may be variously modified or changed depending on the environment in which the present invention is implemented.

[0098] After the slide movement of the curved portion (156) relative to the main body (157) is completed, the position of the curved portion (156) relative to the main body (157) can be fixed by an external force applied from two adjacent housings (130).

[0099] In general, since the battery manufacturing device (100) sequentially rolls electrode sheets, a relatively large external force may be applied to the connecting member (150) placed between two adjacent housings (130). For example, an external force applied to the connecting member (150) from one of the two housings (130) may be transmitted from the curved portion (156) to the main body (157) through the connecting portion (158), and the external force transmitted to the main body (157) may be transmitted to the other housing (130). In this process, the frictional force generated by the external force acting between the curved portion (156) and the connecting portion (158) is much greater than the force for the curved portion (156) to slide (mainly, the load of the curved portion (156)), so that the position of the curved portion (156) with respect to the main body (157) may be fixed.

[0100] FIG. 9 is a drawing for explaining deformation relief of a plurality of housings of a battery manufacturing device according to one embodiment of the present invention.

[0101] FIG. 9 (a) is a drawing expressing the degree of deformation that occurs in the plurality of housings (131', 132', 133', 134') when an external force of a predetermined size is applied when the surface of the connecting member arranged between the plurality of housings (131', 132', 133', 134') is flat. FIG. 7 (b) is a drawing expressing the degree of deformation that occurs in the plurality of housings (131, 132, 133, 134) when an external force of a predetermined size is applied when a connecting member (151, 152, 153) according to an embodiment of the present invention is arranged between the plurality of housings (131, 132, 133, 134).

[0102] Referring to Fig. 9, it can be seen that in (a) of Fig. 9, deformation is concentrated and occurs in local areas of multiple housings (131', 132', 133', 134'). On the other hand, in (b) of Fig. 9, it can be seen that deformation is distributed and alleviated overall in multiple housings (131, 132, 133, 134).

[0103] Fig. 10 is a drawing for explaining deformation relief of a second bearing portion of a battery manufacturing device according to one embodiment of the present invention. Fig. 11 is a drawing for explaining deformation relief of a third bearing portion of a battery manufacturing device according to one embodiment of the present invention.

[0104] FIG. 10 (a) and FIG. 11 (a) are drawings expressing the degree of deformation (distortion) that occurs in the second bearing part (142') and the third bearing part (143') when an external force of a predetermined magnitude is applied when the surface of the connecting member arranged between the plurality of housings (131', 132', 133', 134') is flat. FIG. 10 (b) and FIG. 11 (b) are drawings expressing the degree of deformation (distortion) that occurs in the second bearing part (142) and the third bearing part (143) when an external force of a predetermined magnitude is applied when the connecting member (151, 152, 153) according to one embodiment of the present invention is arranged between the plurality of housings (131, 132, 133, 134).

[0105] As illustrated in Fig. 10, the second bearing part (142') illustrated in (a) is severely deformed (distorted). On the other hand, it can be seen that the deformation (distortion) is alleviated in the second bearing part (142') illustrated in (b).

[0106] Likewise, as illustrated in Fig. 11, the third bearing part (143') illustrated in (a) is severely deformed (distorted). On the other hand, it can be seen that the deformation (distortion) is alleviated in the third bearing part (143) illustrated in (b).

[0107] 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.

[0108] [Explanation of symbols]

[0109] 100: Electrode manufacturing device

[0110] 110: Multiple calendaring rolls

[0111] 120: Multiple rotation axes

[0112] 130: Multiple Housing

[0113] 136: Aperture

[0114] 137: Acceptance Home

[0115] 140: Multiple bearing parts

[0116] 150: Multiple connecting elements

[0117] 156: Curved surface

[0118] 157: Main body

[0119] 158: Connection

[0120] 159: Support

Claims

1. A plurality of calendaring rolls arranged at predetermined intervals so that electrode sheets are rolled sequentially; A plurality of housings having openings formed therein for individually supporting the rotational axes of each of the plurality of calendaring rolls; and A plurality of connecting members are disposed between two adjacent housings among the plurality of housings and are in contact with each of the two adjacent housings, An electrode manufacturing device, wherein the connecting member includes a curved portion formed on one side facing one of the two adjacent housings.

2. In paragraph 1, An electrode manufacturing device, wherein the plurality of housings include a receiving groove that receives the curved portion of the connecting member.

3. In paragraph 2, An electrode manufacturing device in which the surface of the above-mentioned receiving groove is formed in a shape corresponding to the curved shape of the above-mentioned curved portion.

4. In paragraph 2, The above curved portion is convex toward the one side, An electrode manufacturing device wherein the above-mentioned receiving groove is concave to receive the above-mentioned curved portion.

5. In paragraph 2, An electrode manufacturing device, wherein when the connecting member is accommodated in the housing, the center of the opening is located on a straight line connecting the center of the curvature of the curved portion to the center of the accommodation groove.

6. In paragraph 1, The radius of curvature of the above-mentioned curved portion and the length of the curved portion are determined by the length in the width direction of the housing, the length in the height direction of the housing, and the diameter of the opening. An electrode manufacturing device, wherein the width direction of the housing is parallel to the direction from one side toward the other side of the two adjacent housings, and the height direction is orthogonal to the width direction.

7. In paragraph 6, The radius of curvature and the length of the curved surface of the above curved surface are derived from the following mathematical expressions 1 to 3. [Mathematical Formula 1] Here, R is the radius of curvature of the curved portion, θ is half of the angle formed by the curved portion based on the center of curvature of the curved portion, L is the length in the width direction of the housing, and D is the diameter of the opening. [Equation 2] Here, R is the radius of curvature of the curved portion, θ is half of the angle formed by the curved portion based on the center of curvature of the curved portion, and H is the length in the height direction of the housing. [Equation 3] Here, l is the curved length of the curved portion, R is the radius of curvature of the curved portion, and θ is half the angle formed by the curved portion based on the center of curvature of the curved portion. An electrode manufacturing device.

8. In paragraph 1, The above connecting member is, A main body portion disposed on the other side facing the other of the two adjacent housings; and An electrode manufacturing device further comprising a connecting portion disposed between the main body portion and the curved portion to support the curved portion.

9. In paragraph 8, An electrode manufacturing device, wherein the connecting member further includes a support portion arranged on the other side of the main body portion and in contact with the other one of the two adjacent housings.

10. In paragraph 8, An electrode manufacturing device wherein the above-mentioned curved portion is slidable relative to the above-mentioned main body portion.

11. In paragraph 10, Either of the above-mentioned curved portion and the above-mentioned main body portion includes a guide groove formed in a recessed surface of either of the respective opposing surfaces, An electrode manufacturing device, wherein the connecting portion includes a guide protrusion that is inserted into the guide groove and is slidable along the guide groove.

12. In paragraph 11, An electrode manufacturing device, wherein the above guide groove extends along a height direction perpendicular to the direction from one side to the other side.

13. In paragraph 11, The direction in which the above-mentioned curved portion slides is inclined with respect to the surface of the other one of the two adjacent housings, An electrode manufacturing device in which the gap between the two adjacent housings is adjusted according to the sliding movement of the curved portion.

14. In paragraph 10, An electrode manufacturing device, wherein the position of the curved portion with respect to the main body portion is fixed by an external force applied from two adjacent housings after the slide movement with respect to the main body portion is completed.

15. In paragraph 1, An electrode manufacturing device further comprising a bearing part disposed in the opening and supporting the rotational axis.

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