Rolling roll having two or more flow channels formed therein
A rolling roll with dual flow paths of differing lengths addresses crown shape inconsistencies and side thickness issues by controlling temperature distribution, enhancing electrode quality and process capability.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- LG ENERGY SOLUTION LTD
- Filing Date
- 2025-12-10
- Publication Date
- 2026-07-23
AI Technical Summary
Conventional rolling rolls with a single flow path face challenges in maintaining optimal crown shape and preventing side thickness deviations during the rolling process of electrodes, leading to issues like thickness variations and side sagging, especially when producing the same electrode model continuously.
The implementation of a rolling roll with two distinct full-width flow paths of varying lengths, allowing for independent control of cooling oil flow through parallel channels, enables adjustment of the crown shape by varying the temperature distribution across the electrode surface.
This design allows for optimal crown adjustment for each electrode model, minimizing thickness deviations and ensuring consistent quality by providing maximum back pressure margin during continuous production.
Smart Images
Figure KR2025021317_23072026_PF_FP_ABST
Abstract
Description
A rolling roll having two or more Euros formed
[0001] Cross-citation with related application(s)
[0002] The present application claims the benefit of priority based on Korean Patent Application No. 10-2025-0006024 filed January 15, 2025 and Korean Patent Application No. 10-2025-0194101 filed December 9, 2025, and all contents disclosed in the documents of said Korean patent applications are incorporated herein as part of the specification.
[0003] The present invention relates to a rolling roll having two or more flow paths formed therein, and more specifically, to a rolling roll comprising two or more full-width flow path sections having different full-width lengths.
[0004] In modern society, as the use of portable devices such as mobile phones, laptops, camcorders, and digital cameras, as well as energy storage systems (ESS), has become commonplace, the development of technologies in related fields is becoming active. Furthermore, rechargeable secondary batteries are being utilized as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) as a solution to address air pollution caused by conventional gasoline vehicles using fossil fuels; consequently, the need for the development of secondary batteries is increasing.
[0005] Currently commercialized rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium-ion batteries. Among these, lithium-ion batteries are receiving the most attention due to their advantages of free charging and discharging, low self-discharge rate, and high energy density.
[0006] These lithium secondary batteries primarily use lithium-based oxides and carbon materials as the positive and negative active materials, respectively. The lithium secondary battery comprises an electrode assembly in which a positive plate and a negative plate, each coated with the positive and negative active materials, are arranged with a separator in between, and an outer casing, namely a battery case, that seals and houses the electrode assembly together with an electrolyte.
[0007] These secondary batteries are widely used not only in small devices such as portable electronic devices but also in medium-to-large devices such as electric vehicles and Energy Storage Systems (ESS), and their usage is rapidly increasing. Furthermore, recently, there has been a growing trend of using residential battery packs for storing electricity.
[0008] The manufacturing process of such lithium secondary batteries is broadly divided into three stages: electrode process, assembly process, and formation process. The electrode process is further divided into active material mixing process, electrode coating process, rolling process, slitting process, and winding process. Among these, the rolling process is a process of compressing an electrode substrate to a desired thickness by passing it between a pair of high-temperature heated rolling rolls in order to reduce the thickness of the electrode substrate after the coating process to increase capacity density and increase adhesion between the electrode current collector and the electrode active material.
[0009] At this time, the rolling rolls used in the rolling process basically have only one flow path formed inside.
[0010] Specifically, a cross-sectional schematic diagram of a conventional rolling roll is shown in FIG. 1, and a perspective view is shown in FIG. 2.
[0011] Referring to FIGS. 1 and 2, the rolling roll (10) includes a roll body (11), a shaft portion (12) for supporting the roll body (11); a central flow path (13) formed inside the roll body (11) and the shaft portion (12) and formed to allow cooling oil to flow through the center of the roll body (11) in the longitudinal direction of the roll body (11) and the shaft portion (12), and a full-width flow path (14) formed to allow cooling oil to flow near the outer surface of the roll body (11).
[0012] Here, the coolant flows from the coolant supply section (not shown) through the central channel (13), flows from the central channel (13) to the full channel (14) by a branch channel, and then returns to the central channel (13) and is discharged by the coolant discharge section (not shown).
[0013] Although not shown in the drawing, the central channel (13) has a structure that includes a supply channel connected to a cooling oil supply section and a discharge channel connected to a cooling oil discharge section, and the supply channel and the discharge channel are separated and do not mix.
[0014] In addition, the full width Euro (14) has a zigzag pattern near the outer surface of the roll body (11) and is formed with five or more spacings.
[0015] However, since the conventional rolling roll (10) of this structure contains only one flow path, the crown shape for each arc is fixed, so when rolling electrode models under different conditions in the same arc, the side thickness is adjusted only by reverse pressure.
[0016] However, there was a problem in that the optimal crown varied depending on the electrode model, and consequently, thickness deviations between the center and the sides of the electrode occurred differently.
[0017] In addition, when continuously producing the same electrode model in the same unit, there was also a problem where side thickness sagging occurred as the continuous operating time increased, even at maximum back pressure.
[0018] Therefore, there is a need for rolling technology that can improve electrode quality by rolling with an optimal crown for each electrode model and preventing side sinking even when continuously producing the same electrode model.
[0019] The present invention aims to improve side thickness process capability with an optimal crown for each model.
[0020] In addition, the purpose is to provide a rolling roll capable of securing the maximum back pressure margin even when continuously producing the same model.
[0021] However, the problems that the embodiments of the present invention aim to solve 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.
[0022] According to one embodiment of the present invention,
[0023] Roll main body;
[0024] A shaft portion for supporting the above-mentioned roll body; and
[0025] Formed inside the above-mentioned roll body and the above-mentioned shaft part,
[0026] A central flow path section comprising a first central flow path formed to allow cooling oil to flow through the center of the roll body in the longitudinal direction of the roll body and the shaft section, and a second central flow path formed to allow cooling oil to flow separately from the first central flow path, and
[0027] It includes a full-width flow path section comprising a first full-width flow path formed to allow the cooling oil to flow near the outer surface of the roll body, and a second full-width flow path formed to allow the cooling oil to flow near the outer surface of the roll body.
[0028] A rolling roll is provided that includes a flow path section in which the length of the first full-width flow path is longer than the length of the second full-width flow path.
[0029] Here, the first central channel and the first full-width channel may be formed parallel to each other, and the second central channel and the second full-width channel may be formed parallel to each other.
[0030] Additionally, it may further include a first branch channel formed to connect the first central channel and the first full-width channel, and a second branch channel formed to connect the second central channel and the second full-width channel.
[0031] In one specific example, the first central flow path includes a first supply central flow path flowing in a first direction for supplying the coolant, and a first discharge central flow path flowing in a second direction opposite to the first direction for discharging the coolant.
[0032] The first branch path may include a first supply branch path formed to allow the cooling oil to flow from the first supply center path to the first full-width path, and a first discharge branch path formed to allow the cooling oil to flow from the first full-width path to the first discharge center path.
[0033] In addition, the second central flow path includes a second supply central flow path flowing in a first direction for supplying the cooling oil, and a second discharge central flow path flowing in a second direction opposite to the first direction for discharging the cooling oil.
[0034] The second branch path includes a second supply branch path formed to allow the cooling oil to flow from the second supply center path to the second full-width path, and a second discharge branch path formed to allow the cooling oil to flow from the second full-width path to the second discharge center path.
[0035] The second supply branch channel and the second discharge branch channel may be formed so that their width gradually increases from the second supply center channel side to the second full-width channel side.
[0036] In one specific example, the first central flow path includes a first-1 supply central flow path flowing in a first direction for supplying the coolant, a first-2 supply central flow path flowing in a second direction opposite to the first direction, and a first discharge central flow path flowing to discharge the coolant in the second direction.
[0037] The first branch path may include a first supply branch path formed to allow the cooling oil to flow from the first-2 supply center path to the first full-width path, and a first discharge branch path formed to allow the cooling oil to flow from the first full-width path to the first discharge center path.
[0038] In addition, the second central flow path includes a second supply central flow path flowing in a first direction for supplying the cooling oil, and a second discharge central flow path flowing in a second direction opposite to the first direction for discharging the cooling oil.
[0039] The second branch path includes a second supply branch path formed to allow the cooling oil to flow from the second supply center path to the second full-width path, and a second discharge branch path formed to allow the cooling oil to flow from the second full-width path to the second discharge center path.
[0040] The second supply branch channel and the second discharge branch channel may be formed so that their width gradually decreases from the second supply center channel side to the second full-width channel side.
[0041] In one specific example, the first full-width passage includes a first-1 full-width passage flowing in a first direction for supplying the coolant, a second full-width passage flowing in a second direction opposite to the first direction for discharging the coolant, and a first connecting passage connecting the first-1 full-width passage and the first-2 full-width passage.
[0042] The above second full-width flow path may each include a second-1 full-width flow path flowing in the first direction, a second-2 full-width flow path flowing in the second direction, and a second connecting flow path connecting the second-1 full-width flow path and the second-2 full-width flow path.
[0043] Here, the first-1 full-width flow path and the second-1 full-width flow path flowing in the first direction are each one, and the first-2 full-width flow path and the second-2 full-width flow path flowing in the second direction may be two.
[0044] Meanwhile, the first full-width channel may have a length of 60 to 95% of the length of the roll body, and the second full-width channel may have a length of 10 to 70% of the length of the roll body within a range smaller than the length of the first full-width channel.
[0045] Additionally, the first full-width channel and the second full-width channel may be alternately arranged in the circumferential direction of the roll body. At this time, the first full-width channel and the second full-width channel may be arranged at equal intervals.
[0046] These first full-width lanes and second full-width lanes may each be formed in three or more numbers.
[0047] In addition, the first full-width channel and the second full-width channel may be formed at different depths on the surface of the roll body.
[0048] In one specific example, the full-width flow path may further include a third full-width flow path having a shorter length than the second full-width flow path.
[0049] The above cooling fluid can be controlled to flow only in the first full-width passage, only in the second full-width passage, or simultaneously in the first full-width passage and the second full-width passage.
[0050] The above cooling oil may have a temperature in the range of 25°C to 100°C, and when the first full-width flow path and the second full-width flow path are controlled to flow simultaneously, the first full-width flow path and the second full-width flow path may be controlled so that cooling oil having different temperatures flows through them.
[0051] Figure 1 is a schematic cross-sectional view of a conventional rolling roll.
[0052] Figure 2 is a perspective view of a conventional rolling roll.
[0053] FIG. 3 is a schematic cross-sectional view of a rolling roll according to one embodiment of the present invention.
[0054] Figure 4 is an enlarged schematic diagram of the central flow path section of the rolling roll of Figure 3.
[0055] Figure 5 is a schematic cross-sectional view of the central flow path in the rolling roll of Figure 3.
[0056] FIG. 6 is a perspective view to show the shape of the first full-width flow path and the first branch flow path in the rolling roll of FIG. 3.
[0057] Fig. 7 is a perspective view of the rolling roll of Fig. 3.
[0058] Figure 8 is a schematic cross-sectional view of the roll body of Figure 3.
[0059] FIG. 9 is a schematic cross-sectional view of a rolling roll according to another embodiment of the present invention.
[0060] Figure 10 is an enlarged schematic diagram of the central flow path section of the rolling roll of Figure 9.
[0061] 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 present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein.
[0062] To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification.
[0063] Furthermore, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, and thus the present invention is not necessarily limited to what is illustrated. Thicknesses have been enlarged in the drawings to clearly represent various layers and regions. Additionally, for convenience of explanation, the thickness of some layers and regions has been exaggerated in the drawings.
[0064] Furthermore, when a part such as a layer, membrane, region, or plate is said to be "on" or "on" another part, this includes not only the case where it is "directly on" another part, but also the case where there is another part in between. Conversely, when a part is said to be "directly on" another part, it means that there is no other part in between. Also, saying that a part is "on" or "on" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "on" or "on" facing the opposite direction of gravity.
[0065] Furthermore, throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.
[0066] Additionally, throughout the specification, "planar" means when the subject part is viewed from above, and "cross-sectional" means when the cross-section obtained by vertically cutting the subject part is viewed from the side.
[0067]
[0068] Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0069] FIG. 3 shows a schematic cross-sectional view of a rolling roll according to one embodiment of the present invention, FIG. 4 shows an enlarged schematic view of the vicinity of the central flow path of the rolling roll, and FIG. 5 shows a schematic cross-sectional view of the central flow path.
[0070] First, referring to FIG. 3, a rolling roll (100) according to one embodiment of the present invention is structured to include a roll body (110); a shaft portion (120) for supporting the roll body (110); and a flow path portion formed inside the roll body (110) and the shaft portion (120).
[0071] Here, the flow path section includes a central flow path section comprising a first central flow path (130) formed to allow cooling oil to flow through the center of the roll body (110) in the longitudinal direction of the roll body (110) and the shaft section (120), and a second central flow path (140) formed to allow cooling oil to flow separately from the first central flow path (130), a first full-width flow path (150) formed to allow cooling oil to flow near the outer surface of the roll body (110), and a full-width flow path section comprising a second full-width flow path (160) formed to allow cooling oil to flow near the outer surface of the roll body (110), wherein the length (l1) of the first full-width flow path (150) is longer than the length (l2) of the second full-width flow path (160).
[0072] Also, referring to FIGS. 3 and 4 together, the first central channel (130) is formed parallel to the first full-width channel (150), and the first central channel (130) is connected to the first full-width channel (150) by the first branch channel (170), and the second central channel (140) is formed parallel to the second full-width channel (160), and the second central channel (140) is connected to the second full-width channel (160) by the second branch channel (180).
[0073] Below, each Euro is explained in more detail.
[0074] First, referring to FIGS. 3 to 5, the first central flow path (130) is composed of a first supply central flow path (131) flowing in a first direction for supplying the cooling oil, and a first discharge central flow path (132) flowing in a second direction opposite to the first direction for discharging the cooling oil. Here, the first supply central flow path (131) is located at the innermost part of the central flow path section, and the first discharge central flow path (132) is located at the outermost part of the central flow path section. These positions are not limited, and any structure is possible as long as they are separated.
[0075] And, these first supply center flow path (131) and first discharge center flow path (132) are connected to the first full-width flow path (150) by the first branch flow path (170). Specifically, the cooling water introduced into the first supply center flow path (131) flows to the first full-width flow path (150) through the first supply branch flow path (171), and the cooling water circulated through the first full-width flow path (150) is discharged from the rolling roll (100) through the first discharge center flow path (132) by the first discharge branch flow path (172).
[0076] At this time, the shape formed by the first supply branch path (171) and the first discharge branch path (172) can be formed such that the width gradually increases from the first supply center path (131) side to the first full width path (150) side.
[0077] Similarly, the second central channel (140) is composed of a second supply central channel (141) flowing in a first direction in the direction of supplying the coolant, and a second discharge central channel (142) flowing in a second direction opposite to the first direction and in the direction of discharging the coolant. Here, the second supply central channel (141) is located on the outer side along the outer surface of the first supply central channel (131), which is located on the innermost side of the central channel section, and the second discharge central channel (142) is located between the first discharge central channel (132), which is located on the outermost side of the central channel section, and the second supply central channel (141). These positions are not limited, and any structure is possible as long as they are separated.
[0078] And, these second supply center flow path (141) and second discharge center flow path (142) are connected to the second full-width flow path (160) by the second branch flow path (180). Specifically, the cooling water introduced into the second supply center flow path (141) flows to the second full-width flow path (160) through the second supply branch flow path (181), and the cooling water circulated through the second full-width flow path (160) is discharged from the rolling roll (100) through the second discharge center flow path (142) by the second discharge branch flow path (182).
[0079] At this time, the second supply branch channel (181) and the second discharge branch channel (182) are formed such that their width gradually increases from the second supply center channel (141) side toward the second full-width channel (160) side.
[0080] In this way, according to the present invention, the cooling water has a structure in which it circulates inside the rolling roll (100) by means of two passages, wherein the length of the first full-width passage (150) is longer than that of the second full-width passage (160), so that the cooling oil flowing through the first supply center passage (131) - first supply branch passage (171) - first full-width passage (140) - first discharge branch passage (172) - first discharge center passage (132) has a longer circulation structure compared to the cooling oil flowing through the second supply center passage (141) - second supply branch passage (181) - first full-width passage (150) - first discharge branch passage (182) - first discharge center passage (142).
[0081] The rolling roll (100) according to the present invention has two flow paths in this way, so when producing electrodes of different models in the same machine, an optimal crown can be applied, thereby improving the ease of managing side thickness.
[0082] Specifically, the cooling fluid can be controlled to flow only in the first full-width passage, only in the second full-width passage, or simultaneously in the first full-width passage and the second full-width passage.
[0083] At this time, when cooling water is flowed using only the first full-width channel (150), the heat transfer section near the outer surface of the roll body (110) is longer in the longitudinal direction, so the temperature difference between the center and the side can be minimized, thereby enabling the realization of a minimum crown shape. When cooling water is flowed using only the second full-width channel (160), the heat transfer section near the outer surface of the roll body (110) is shorter in the longitudinal direction, so the temperature difference between the center and the side is maximized, thereby enabling the realization of a maximum crown shape. Furthermore, by using the first full-width channel (150) and the second full-width channel (160) simultaneously and making the temperatures of the cooling water flowing through them different, the temperature difference between the center and the side can be controlled, and accordingly, an optimal crown for each electrode model can be applied.
[0084] Here, the cooling oil may have a temperature in the range of 25°C to 100°C, specifically 25°C to 80°C, and more specifically 30°C to 80°C. By controlling the temperature of the cooling oil within the above range, the crown shape can be controlled.
[0085] Additionally, as described above, when the cooling oil is controlled to flow simultaneously through the first full-width passage (150) and the second full-width passage (160), the temperature of the cooling oil flowing through them may differ from each other within the above range, and the specific temperature may be appropriately selected according to the crown shape to be implemented.
[0086] Meanwhile, the difference in length between the first full-width channel (150) and the second full-width channel (160) can be appropriately determined considering the application of the crown, but in order to apply the optimal crown to various models, it is desirable that the length (l1) of the first full-width channel (150) be formed to be as similar as possible to the length near the outer surface of the roll body (110), and may be 60 to 99% of the length of the roll body (110), more specifically 70 to 95%, more specifically 80 to 95%, and most specifically 90 to 95%.
[0087] When within the above range, it is easy to create a difference from the second full width Euro (160), and accordingly, crown adjustment is easy.
[0088] Meanwhile, it is preferable that the second full-width channel (160) be formed in a shorter range than the first full-width channel (150), and in order to achieve a minimum crown, the length (l2) may be 10 to 70%, more specifically 20 to 70%, and more specifically 30 to 60% of the length of the roll body (110) in a range smaller than the length (l1) of the first full-width channel (150).
[0089] When within the above range, it is easy to make a difference from the first full-width Euro (150). Meanwhile, the first full-width Euro (150) and the second full-width Euro (160) may be formed as a single straight Euro, and furthermore, may be formed as three or more zigzag Euros.
[0090] To explain this in detail, FIG. 6 shows a perspective view to show the shape of the first full-width Euro (150) and the first branch Euro (170).
[0091] Referring to FIG. 6, the first full-width passage (150) may be structured to include one first-1 full-width passage (151) flowing in a first direction for supplying cooling oil, two first-2 full-width passages (152) flowing in a second direction for discharging cooling oil in a direction opposite to the first direction, and first connecting passages (153) connecting the first-1 full-width passage (151) and the first-2 full-width passage (152).
[0092] Accordingly, referring to FIG. 4 and FIG. 6 together, the coolant supplied to flow in the first direction through the first supply center channel (131) flows into the first supply branch channel (171), flows in the second direction through the first first connection channel (153) and the first first-2 full-width channel (152), flows in the first direction through the second first connection channel (153) and the first-1 full-width channel (151), flows again in the second direction through the third first connection channel (153) and the second first-2 full-width channel (152), and then passes through the fourth first connection channel (153) and is delivered to the first discharge center channel (132) through the first discharge branch channel (172).
[0093] Similarly, although not illustrated in the drawing, as described in FIG. 6, the second full-width passage may also be structured to include one second-1 full-width passage flowing in a first direction for supplying the cooling oil, two second-2 full-width passages flowing in a second direction for discharging the cooling oil in the opposite direction to the first direction, and second connecting passages connecting the second-1 full-width passage and the second-2 full-width passage, and the cooling water flows through the second supply center passage - second supply branch passage - second connecting passage - second-2 full-width passage - second connecting passage - second-1 full-width passage - second connecting passage (153) - second-2 full-width passage (152) - second connecting passage - second discharge branch passage - second discharge center passage (132).
[0094] In this way, when the first full-width channel (150) and the second full-width channel (160) are formed in a zigzag shape, it is more desirable to improve temperature retention and further reduce temperature deviations in the circumferential direction and left and right of the rolling roll, as well as to shorten the temperature change time.
[0095] However, if it is repeated in a zigzag pattern too frequently, the durability of the rolling roll where the Euro is located may be weakened, and it is disadvantageous for maintaining the surface temperature, so it is not desirable.
[0096] Meanwhile, for convenience of explanation, FIGS. 3 to 6 show the first full-width channel (150) and the second full-width channel (160) located on a single plane, and one first full-width channel (150) and one second full-width channel (160) are shown as representative examples. However, the first full-width channel (150) and the second full-width channel (160) have a structure in which they are alternately arranged in the circumferential direction of the roll body (110), and each may be formed in three or more.
[0097] To explain this, FIGS. 7 and 8 respectively show a perspective view of a rolling roll (100) according to the present invention and a cross-sectional schematic view of a roll body.
[0098] Referring to FIG. 7, the first full-width channel (150) and the second full-width channel (160) are alternately arranged in the circumferential direction of the roll body (110). At this time, the first full-width channel (150) and the second full-width channel (160) may be arranged at equal intervals (d).
[0099] Through this, the crown can be adjusted throughout the circumferential direction of the roll body (110).
[0100] Additionally, when the first full-width Euro (150) and the second full-width Euro (160) are formed as a single straight Euro, there may be at least 5 in detail, and at least 10 in detail, and when they are formed in a zigzag, there may be at least 3 in detail, at least 4 in detail, and at least 5 in detail, each.
[0101] The narrower these gaps (d) are, the more densely they are formed along the circumferential direction of the outer surface of the roll body (110), making it more effective for crown adjustment; however, considering the processability of forming the flow paths, it is preferable to form them within the above range. In addition, when the first full-width flow path (150) and the second full-width flow path (160) are each formed in a zigzag pattern, the supply branch flow path and the discharge branch flow path are not formed at the same location on the cross-sectional view of the roll body (110), but are formed at a certain angle.
[0102] Accordingly, FIG. 8 shows a cross-section of a roll body (110) in which five first full-width channels (150) and five second full-width channels (160) are formed, and accordingly, ten first branch channels (170) and ten second branch channels (180) are formed.
[0103] Additionally, referring again to FIG. 3, the first full-width channel (150) and the second full-width channel (160) are shown as being formed at the same depth from the surface of the roll body (110), but they may be formed at different depths. Examples of this will be explained in FIG. 9 and 10 below.
[0104] Meanwhile, although not illustrated in the drawing, the full-width flow path may further include a third full-width flow path having a shorter length than the second full-width flow path (160), and forming two or more full-width flow paths is, of course, included in the scope of the present invention.
[0105] Furthermore, FIGS. 9 and 10 illustrate a rolling roll (200) according to another embodiment of the present invention.
[0106] Referring to FIGS. 9 and 10, the rolling roll (200) differs from the rolling roll (100) of FIGS. 3 to 8 in the shape formed by the second supply branch path and the second discharge branch path, and in the length of the second full-width path.
[0107] More specifically, the first central flow path (230) is composed of a first-1 supply central flow path (231) flowing in a first direction for supplying the cooling oil, a second-2 supply central flow path (233) flowing in a second direction opposite to the first direction, and a first discharge central flow path (232) flowing to discharge the cooling oil in the second direction. Here, the first-1 supply central flow path (231) is located at the innermost part of the central flow path section, the first-2 supply central flow path (233) is formed in the opposite direction at the same location as the second supply central flow path (241) of the second central flow path (240) to be described later, and the first discharge central flow path (232) is located at the outermost part of the central flow path section. These locations are not limited, and any structure is possible as long as they are separated.
[0108] And, these first supply center flow path (231) and first discharge center flow path (232) are connected to the first full-width flow path (250) by the first branch flow path (270). Specifically, the cooling water introduced into the first supply center flow path (231) flows to the first full-width flow path (250) through the first supply branch flow path (271), and the cooling water circulated through the first full-width flow path (250) is discharged from the rolling roll (200) through the first discharge center flow path (232) by the first discharge branch flow path (272).
[0109] At this time, the shape formed by the first supply branch path (271) and the first discharge branch path (272) can be formed such that the width gradually increases from the first supply center path (231) side to the first full width path (250) side.
[0110] Similarly, the second central channel (240) is composed of a second supply central channel (241) flowing in a first direction for supplying the coolant, and a second discharge central channel (242) flowing in a second direction opposite to the first direction for discharging the coolant. Here, the second supply central channel (241) is located on the outer side along the outer surface of the first supply central channel (231), which is located on the innermost side of the central channel section, and the second discharge central channel (242) is located between the first discharge central channel (232) and the second supply central channel (241), which are located on the outermost side of the central channel section. These positions are not limited, and any structure is possible as long as they are separated.
[0111] And, these second supply center flow path (241) and second discharge center flow path (242) are connected to the second full-width flow path (260) by the second branch flow path (280). Specifically, the cooling water introduced into the second supply center flow path (241) flows to the second full-width flow path (260) through the second supply branch flow path (281), and the cooling water circulated through the second full-width flow path (260) is discharged from the rolling roll (200) through the second discharge center flow path (242) by the second discharge branch flow path (282).
[0112] At this time, the second supply branch channel (281) and the second discharge branch channel (282) are formed such that their width gradually decreases from the second supply center channel (241) side toward the second full-width channel (260) side.
[0113] The length (l4) of the first full-width Euro (250) and the length (l3) of the second full-width Euro (260) are as described above.
[0114] In this way, according to the present invention, the cooling water has a structure that circulates inside the rolling roll (200) by means of two passages, wherein the length of the first full-width passage (250) is longer than that of the second full-width passage (260), and thus has a longer circulation structure compared to the cooling water flowing through the first full-width passage (250).
[0115] The rolling roll (200) according to the present invention has two flow paths in this way, so when producing electrodes of different models in the same machine, the optimal crown can be applied, thereby improving the ease of managing side thickness.
[0116] Other descriptions regarding the circulation structure, number, arrangement, etc. of the first central channel (230), the second central channel (240), the first full-width channel (250), and the second full-width channel (260) are similar to those described for the rolling roll (200) above.
[0117] However, although FIG. 3 is illustrated as a drawing in which the first full-width channel (150) and the second full-width channel (160) are formed at the same depth from the surface of the roll body (110), with reference to FIG. 9, the depth (d1) formed from the surface of the roll body (210) of the first full-width channel (250) is shorter than the depth (d2) formed from the surface of the roll body (210) of the second full-width channel (260).
[0118] Additionally, although not shown in the drawing, the depth at which the second full-width channel is formed from the surface of the roll body may be shorter than the depth at which the first full-width channel is formed from the surface of the roll body.
[0119] That is, as illustrated in FIGS. 3 and FIGS. 9, the depth formed from the surface of the roll body of the first full-width channel and the second full-width channel may be the same or different, but in detail, they may be different.
[0120] When the depths are formed differently, it is possible to mitigate temperature variations on the surface of the roll body and prevent interference between the first full-width flow path and the second full-width flow path, as well as to achieve effects such as mitigating internal temperature variations and improving the surface durability of the rolling roll. The rolling roll according to the present invention is coupled to a rolling mill for rolling and forming battery electrodes of a secondary battery.
[0121] The roll body has a roll surface as an outer surface that contacts the electrode when, for example, rolling and forming the electrode of a secondary battery, and the shaft portion is supported by the rolling mill through a ball bearing, although not shown in the drawing.
[0122] The rolling roll according to the present invention may be a chrome rolling roll or a DLC (diamond like carbon) rolling roll.
[0123]
[0124] Although a preferred embodiment of the present invention has been described in detail above with reference to the drawings, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.
[0125] [Explanation of the symbol]
[0126] 10: Conventional rolling roll,
[0127] 100, 200: Rolling roll according to the present invention,
[0128] 110, 210: Roll main body,
[0129] 120, 220: Blessing,
[0130] 130, 230: 1st central Euro,
[0131] 140, 240: Second central Euro,
[0132] 150, 250: 1st full width Euro,
[0133] 160, 260: 2nd full width Euro,
[0134] 170, 270: 1st branch Euro,
[0135] 180, 280: Second Euro.
[0136] According to the present invention, by applying two flow paths to a rolling roll and varying the full width and flow path length of these flow paths, it is possible to apply an optimal crown for each model in the same machine, thereby improving the electrode side thickness process capability.
[0137] In addition, even when continuously producing the same model in the same unit, the maximum back pressure margin can be secured, which has the effect of improving thickness process capability and enhancing electrode quality.
[0138] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims.
Claims
1. Roll main body; A shaft portion for supporting the above-mentioned roll body; and Formed inside the above-mentioned roll body and the above-mentioned shaft part, A central flow path section comprising a first central flow path formed to allow cooling oil to flow through the center of the roll body in the longitudinal direction of the roll body and the shaft section, and a second central flow path formed to allow cooling oil to flow separately from the first central flow path, and It includes a full-width flow path section comprising a first full-width flow path formed to allow the cooling oil to flow near the outer surface of the roll body, and a second full-width flow path formed to allow the cooling oil to flow near the outer surface of the roll body. A rolling roll comprising a flow path section in which the length of the first full-width flow path is longer than the length of the second full-width flow path.
2. In Paragraph 1, A rolling roll in which the first central channel and the first wide channel are formed parallel to each other, and the second central channel and the second wide channel are formed parallel to each other.
3. In Paragraph 1, A rolling roll further comprising a first branch channel formed to connect the first central channel and the first full-width channel, and a second branch channel formed to connect the second central channel and the second full-width channel.
4. In Paragraph 3, The first central flow path includes a first supply central flow path flowing in a first direction for supplying the cooling oil, and a first discharge central flow path flowing in a second direction opposite to the first direction for discharging the cooling oil. A rolling roll comprising a first supply branch path formed to allow the cooling oil to flow from the first supply center path to the first full-width path, and a first discharge branch path formed to allow the cooling oil to flow from the first full-width path to the first discharge center path.
5. In Paragraph 3, The second central flow path includes a second supply central flow path flowing in a first direction for supplying the coolant, and a second discharge central flow path flowing in a second direction opposite to the first direction for discharging the coolant. The second branch path includes a second supply branch path formed to allow the cooling oil to flow from the second supply center path to the second full-width path, and a second discharge branch path formed to allow the cooling oil to flow from the second full-width path to the second discharge center path. The rolling roll is formed such that the second supply branch path and the second discharge branch path gradually increase in width from the second supply center path side to the second full-width path side.
6. In Paragraph 3, The above-mentioned first central flow path includes a first-1 supply central flow path flowing in a first direction for supplying the coolant, a first-2 supply central flow path flowing in a second direction opposite to the first direction, and a first discharge central flow path flowing to discharge the coolant in the second direction. A rolling roll comprising a first supply branch path formed to allow the cooling oil to flow from the first-2 supply center path to the first full-width path, and a first discharge branch path formed to allow the cooling oil to flow from the first full-width path to the first discharge center path.
7. In Paragraph 3, The second central flow path includes a second supply central flow path flowing in a first direction for supplying the coolant, and a second discharge central flow path flowing in a second direction opposite to the first direction for discharging the coolant. The second branch path includes a second supply branch path formed to allow the cooling oil to flow from the second supply center path to the second full-width path, and a second discharge branch path formed to allow the cooling oil to flow from the second full-width path to the second discharge center path. A rolling roll in which the second supply branch path and the second discharge branch path are formed such that their widths gradually decrease from the second supply center path side to the second full-width path side.
8. In Paragraph 1, The first full-width passage includes a first-1 full-width passage flowing in a first direction for supplying the cooling oil, a second full-width passage flowing in a second direction opposite to the first direction for discharging the cooling oil, and a first connecting passage connecting the first-1 full-width passage and the first-2 full-width passage. The above second full-width passage includes, respectively, a second-1 full-width passage flowing in the first direction and a second-2 full-width passage flowing in the second direction, and a second connecting passage connecting the second-1 full-width passage and the second-2 full-width passage.
9. In Paragraph 8, A rolling roll having one first-1 full-width flow path and one second-1 full-width flow path flowing in the first direction, and two first-2 full-width flow paths and two second-2 full-width flow paths flowing in the second direction.
10. In Paragraph 1, A rolling roll having a first full-width channel having a length of 60 to 95% of the length of the roll body, and a second full-width channel having a length of 10 to 70% of the length of the roll body within a range smaller than the length of the first full-width channel.
11. In Paragraph 1, The first full-width channel and the second full-width channel are alternately arranged in the circumferential direction of the roll body.
12. In Paragraph 12, The first full-width channel and the second full-width channel are rolling rolls arranged at equal intervals.
13. In Paragraph 1, A rolling roll in which the first full-width channel and the second full-width channel are each formed with three or more.
14. In Paragraph 1, A rolling roll in which the first full-width channel and the second full-width channel are formed at different depths on the surface of the roll body.
15. In Paragraph 1, The above-mentioned full-width Euro section further includes a third full-width Euro having a shorter length than the second full-width Euro, in a rolling roll.
16. In Paragraph 1, A rolling roll in which the cooling oil is controlled to flow only in the first full-width passage, only in the second full-width passage, or simultaneously in the first full-width passage and the second full-width passage.
17. In Paragraph 1, The above cooling oil is a rolling roll having a temperature in the range of 25°C to 100°C.
18. In Paragraph 17, A rolling roll in which, when the first full-width flow path and the second full-width flow path are controlled to flow simultaneously, the first full-width flow path and the second full-width flow path are controlled to flow cooling oil having different temperatures from each other.