Stretching assembly and stretching device

Abstract

The present application relates to a kind of stretching assembly and extension device, and stretching assembly includes mandrel, support roller, eccentric wheel and stretching roller.Pole piece can be around the stretching assembly and make coating area and blank area correspond to support roller and stretching roller respectively.The part of stretching roller that is in contact with pole piece can protrude from the surface of support roller, so that greater tension is applied to the blank area of pole piece to achieve extension.While the incoming material of pole piece changes, mandrel can be rotated around its own axis by driving member.At this time, eccentric wheel will also rotate with mandrel, so that the axis of the outer ring of eccentric wheel, i.e.the axis of stretching roller 140, also rotates around the axis of mandrel, and then adjusts the height of the part of stretching roller that protrudes from the surface of support roller in contact with pole piece.It can be seen that by rotating mandrel with driving member, the stretching effect of the above-mentioned stretching assembly on the blank area of pole piece can be adjusted in real time, so the adjustment is more convenient.

Description

Technical Field

[0001] This invention relates to the field of automation technology, and in particular to a stretching component and an extension device. Background Technology

[0002] In the lithium battery manufacturing process, the electrode sheets need to be rolled. The electrode sheet includes a coating area and a blank area. Due to the difference in tension between the coating and the foil, the blank area of ​​the rolled electrode sheet has a large tensile stress, which causes the foil edge of the blank area to wrinkle.

[0003] To address this issue, a tension mechanism is needed to pre-stretch the electrode sheet before or after rolling. This tension mechanism includes a tension roller, which forms annular protrusions by winding several layers of material around a predetermined position. As the electrode sheet passes over the tension roller, the annular protrusions contact the blank areas of the electrode sheet. Therefore, most of the tension from the tension roller is applied to the blank areas of the electrode sheet, effectively "pulling" the foil in those areas apart to achieve pre-stretching.

[0004] Because the incoming materials for the electrode sheets frequently change, the height of the annular protrusions needs frequent adjustment to achieve a match. Currently, the height adjustment of the annular protrusions relies on manual operation, which can be achieved by adjusting the number of layers or the thickness of the wound strip. Each adjustment requires multiple attempts with different strip thicknesses and numbers of layers to meet the requirements, and the limited operating space makes the adjustment very inconvenient. Summary of the Invention

[0005] Therefore, it is necessary to provide a stretching component and extension device that can be easily adjusted according to changes in incoming materials to address the above problems.

[0006] A stretching assembly includes a mandrel, a support roller, an eccentric wheel, and a stretching roller. The support roller is rotatably sleeved on the mandrel and coaxially arranged with the mandrel. The eccentric wheel has an inner ring and an outer ring eccentrically arranged relative to the inner ring. The inner ring is fixedly sleeved on the mandrel and coaxially arranged with the mandrel. The stretching roller is rotatably sleeved on the outer ring and coaxially arranged with the outer ring.

[0007] The electrode sheet can be wound around the stretching assembly, and the coating area and the blank area correspond to the support roller and the stretching roller, respectively.

[0008] In one embodiment, the support roller and the tension roller are alternately arranged along the axial direction of the mandrel.

[0009] In one embodiment, the mandrel is provided with first bearings at both ends.

[0010] In one embodiment, the support roller is rotatably mounted on the mandrel via a second bearing, and the stretching roller is rotatably mounted on the outer ring via a third bearing.

[0011] In one embodiment, both sides of the stretching roller have chamfered structures extending circumferentially.

[0012] In one embodiment, the surface of the stretching roller is covered with a wear-resistant layer.

[0013] In one embodiment, the wear-resistant layer comprises multiple layers of interlocking strips, the width of which decreases from the inside to the outside to form a chamfered structure on both sides of the stretching roller.

[0014] An extension device, comprising:

[0015] The tensioning component as described in any of the preferred embodiments above; and

[0016] A driving component is connected to the spindle, and the spindle can rotate around its own axis under the drive of the driving component.

[0017] In one embodiment, the driving component is a servo motor, and the shaft of the servo motor is connected to the spindle via a coupling.

[0018] In one embodiment, a first guide roller and a second guide roller are respectively located upstream and downstream of the stretching assembly, and the electrode sheet can be wrapped around the first guide roller and the second guide roller to form a wrap angle on the stretching assembly.

[0019] In the aforementioned stretching assembly and extension device, the electrode sheet can pass around the stretching assembly, with the coated area and the blank area corresponding to the support roller and the stretching roller, respectively. The portion of the stretching roller that contacts the electrode sheet protrudes beyond the surface of the support roller, thereby applying greater tension to the blank area of ​​the electrode sheet to achieve extension. When the incoming material of the electrode sheet changes, the drive component can drive the mandrel to rotate around its own axis. At this time, the eccentric wheel will also rotate with the mandrel, causing the axis of the outer ring of the eccentric wheel, i.e., the axis of the stretching roller, to also rotate around the axis of the mandrel, thereby adjusting the height of the portion of the stretching roller that contacts the electrode sheet protruding beyond the surface of the support roller. Therefore, by driving the mandrel to rotate, the stretching effect of the aforementioned stretching assembly on the blank area of ​​the electrode sheet can be adjusted in real time, making adjustment more convenient. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a partial structural schematic diagram of the extension device in a preferred embodiment of the present invention;

[0022] Figure 2 for Figure 1 Front view of the extension device shown;

[0023] Figure 3 for Figure 2 The extension device shown is a cross-sectional view along AA;

[0024] Figure 4 for Figure 1 A schematic diagram of the stretching component in the stretching device shown.

[0025] Figure 5 for Figure 4 A cross-sectional view of the stretching component shown.

[0026] Figure 6 for Figure 4 A schematic diagram of the eccentric wheel in the tensioning assembly shown;

[0027] Figure 7 for Figure 1 A front view of another usage state of the extension device shown;

[0028] Figure 8 for Figure 7 The extension device shown is a cross-sectional view along EE;

[0029] Figure 9 This is an enlarged schematic diagram of the stretching roller in another embodiment. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0036] Please see Figure 1 , Figure 2 and Figure 3 The present invention provides an extension device 10 and a stretching assembly 100. The extension device 10 includes a stretching assembly 100 and a driving member 200.

[0037] The electrode 20 to be stretched can be wound around the stretching assembly 100. Specifically, the electrode 20 includes a coating area 21 and a blank area 22. The coating area 21 and the blank area 22 are arranged side by side along the width direction of the electrode 20 and both extend along the length direction of the electrode 20.

[0038] Please refer to the following: Figure 4 and Figure 5 In a preferred embodiment of the present invention, the stretching assembly 100 includes a mandrel 110, a support roller 120, an eccentric wheel 130, and a stretching roller 140.

[0039] The mandrel 110 is generally made of stainless steel and has high mechanical strength. The drive component 200 is connected to the mandrel 110, and the mandrel 110 can rotate around its own axis under the drive of the drive component 200. The two ends of the mandrel 110 are generally rotatably mounted on the frame (not shown) of the extension device 10. Specifically, in this embodiment, the two ends of the mandrel 110 are provided with first bearings 150, which cooperate with bearing seats (not shown) to rotatably mount the mandrel 110 on the frame, thereby making the rotation of the mandrel 110 more stable and smoother.

[0040] The drive component 200 can be a motor, rotary cylinder, etc. Please refer again. Figure 3 Specifically, in this embodiment, the driving component 200 is a servo motor, and the servo motor's shaft is connected to the spindle 110 via a coupling 300. The coupling 300 enables a rigid connection between the servo motor's shaft and the spindle 110. Furthermore, the number of rotations of the servo motor can be precisely controlled via an electronic control signal. Therefore, under the drive of the servo motor, the rotation angle of the spindle 110 can be precisely controlled.

[0041] The support roller 120 is rotatably sleeved on the spindle 110 and coaxially arranged with the spindle 110. The support roller 120 is annular and can rotate around the spindle 110. Specifically, in this embodiment, the support roller 120 is rotatably sleeved on the spindle 110 through the second bearing 160, so that the rotation of the support roller 120 is more stable and smoother.

[0042] Please refer to the following: Figure 6 The eccentric wheel 130 has an inner ring (not shown) and an outer ring (not shown). The eccentric wheel 130 is annular and has a circular mounting hole 131. The inner wall of the mounting hole 131 forms the inner ring, the center of which is denoted as O1, while the outer circumference of the eccentric wheel 130 forms the outer ring, the center of which is denoted as O2. The outer ring is eccentrically positioned relative to the inner ring, that is, O1 and O2 do not coincide. For ease of subsequent analysis, four points are evenly marked on the circumference of the outer ring of the eccentric wheel 130, namely C1 (the point closest to the inner ring), C3 (the point farthest from the inner ring), C2, and C4 (located at the exact midpoint of C1 and C3, respectively).

[0043] Furthermore, the inner ring of the eccentric wheel 130 is fixedly sleeved on the spindle 110 and coaxially arranged with the spindle 110. Therefore, the eccentric wheel 130 can rotate with the spindle 110. Since the inner ring of the eccentric wheel 130 is coaxial with the spindle 110, the center O1 of the inner ring coincides with the axis of the spindle 110, while the center O2 of the outer ring can rotate around the axis of the spindle 110 as the spindle 110 rotates.

[0044] Specifically, in this embodiment, the inner ring of the eccentric wheel 130 is fixed to the spindle 110 by a flat key 170. Flat keyways (not shown in the figure) are provided at positions corresponding to the inner ring and the surface of the spindle 110, and the flat key 170 is inserted into the flat keyway to fix the eccentric wheel 130 and the spindle 110.

[0045] The stretching roller 140 is annular in shape. The stretching roller 140 is rotatably fitted onto the outer ring of the eccentric wheel 130 and is coaxially arranged with the outer ring. That is, the axis of the stretching roller 140 coincides with the center O2 of the outer ring. Specifically, in this embodiment, the stretching roller 140 is rotatably fitted onto the outer ring via a third bearing 180, so that the stretching roller 140 rotates more stably and smoothly around the outer ring.

[0046] Please refer to it again. Figure 1 When the electrode 20 passes through the stretching assembly 100, its coating area 21 and blank area 22 correspond to the support roller 120 and the stretching roller 140, respectively. As the electrode 20 moves along the belt, the coating area 21 generates friction with the surface of the support roller 120, thereby driving the support roller 120 to rotate around the spindle 110; while the blank area 22 generates friction with the surface of the stretching roller 140, thereby driving the stretching roller 140 to rotate around the outer ring of the eccentric wheel 130.

[0047] Specifically, in this embodiment, the support roller 120 and the stretching roller 140 are alternately arranged along the axial direction of the mandrel 110. The arrangement of the support roller 120 and the stretching roller 140 corresponds to the distribution of the coating area 21 and the blank area 22 on the electrode sheet 20. Figure 5 As shown in the example, four support rollers 120 are spaced apart along the axial direction of the mandrel 110, and a tension roller 140 is provided between two adjacent support rollers 120.

[0048] When the incoming material of the electrode 20 changes, the drive unit 200 can drive the mandrel 110 to rotate around its own axis. At this time, the eccentric wheel 130 will also rotate with the mandrel 110, so that the center of the outer ring of the eccentric wheel 130, that is, the axis of the stretching roller 140, also rotates around the axis of the mandrel 110. This allows adjustment of the height of the part of the stretching roller 140 that contacts the electrode 20 protruding above the surface of the support roller 120. It can be seen that by driving the mandrel 110 to rotate through the drive unit 200, the stretching effect of the stretching assembly 100 on the blank area 22 of the electrode can be adjusted in real time, making adjustment more convenient.

[0049] like Figure 2 and Figure 3 As shown, the point of contact between the coating area 21 and the support roller 120 is marked as point B, the point of contact with the support roller 120 is marked as point D, and the contact point between the coating area and the support roller 120 between points B and D is marked as point C. When the drive unit 200 drives the spindle 110 to rotate, the center O2 of the outer ring of the eccentric wheel 130, that is, the axis of the stretching roller 140, will also rotate around the center O1 of the inner ring of the eccentric wheel 130. Let the angle formed by points C, O1, and C1 be ∠C1O1C. When the eccentric wheel 130 rotates to the point where the distance between point C1 and contact point C is closest, that is, when the included angle ∠C1O1C is equal to 0°, the part of the stretching roller 140 that contacts the electrode 20 (the part between contact points B and D) protrudes the least from the surface of the support roller 120. At this time, the stretching effect of the stretching roller 140 on the blank area 22 of the electrode 20 is the weakest or non-stretching.

[0050] like Figure 7 and Figure 8 As shown, when the eccentric wheel 130 rotates to the point where the distance between point C1 and contact point C is the greatest, that is, when the included angle ∠C1O1C is equal to 180°, the part of the stretching roller 140 that contacts the electrode 20 protrudes to the maximum height of the support roller 120 surface. At this time, the stretching effect of the stretching roller 140 on the blank area 22 of the electrode 20 is the strongest.

[0051] The drive unit 200 rotates the drive spindle 110, allowing the included angle ∠C1O1C to vary between 0° and 180°. Different sizes of the included angle ∠C1O1C correspond to different heights at which the stretching roller 140 protrudes from the surface of the support roller 120. Therefore, by controlling the rotation angle of the spindle 110 through the drive unit 200, different stretching effects can be achieved.

[0052] In this embodiment, both sides of the stretching roller 140 have chamfered structures 141 extending circumferentially. When the stretching roller 140 abuts against the blank area 22, the chamfered structures 141 can prevent the edge of the stretching roller 140 from generating large friction with the blank area 22, thereby preventing the stretching roller 140 from breaking the electrode sheet 20 when stretching the blank area 22.

[0053] To prevent the stretching roller 140 from wearing out rapidly during operation, thereby extending the service life of the stretching assembly 100 and the extension device 10, the stretching roller 140 can be formed from wear-resistant materials such as ceramics. In this case, chamfered structures 141 can be machined on both sides of the stretching roller 140 by cutting and grinding.

[0054] Please see Figure 9 In other embodiments, a wear-resistant layer 142 may be applied to the surface of the stretching roller 140 to prevent the stretching roller 140 from being worn rapidly during operation. The wear-resistant layer may be formed from wear-resistant materials such as Teflon, DLC (diamond-like carbon film), and ceramics. The wear-resistant layer 142 may be a multi-layer structure or a single-layer structure.

[0055] More specifically, the wear-resistant layer 142 comprises multiple layers of interlocking strips 1421, with the width of each strip decreasing from the inside out. Each strip 1421 is annular and is fitted around the outer periphery of the stretching roller 140. Since the strips 1421 are narrower towards the outer edge, bevels are formed on both sides of the wear-resistant layer 142, thereby creating chamfered structures 141 on both sides of the stretching roller 140.

[0056] Furthermore, in this embodiment, the stretching device 10 also includes a first guide roller 400 and a second guide roller 500, which are located upstream and downstream of the stretching assembly 100, respectively. The electrode 20 can first pass around the first guide roller 400, then around the stretching assembly 100, and finally around the second guide roller 500 to form a wrap angle on the stretching assembly 100.

[0057] The first roller 400 and the second roller 500 enable the electrode 20 to be better enveloped on the surface of the stretching assembly 100, thereby increasing the contact area between the stretching roller 140 and the blank area 22 when the electrode 20 passes through the stretching assembly 100, thus ensuring the stretching effect on the blank area 22.

[0058] The aforementioned stretching assembly 100 and extending device 10 allow the electrode 20 to pass through the stretching assembly 100, with the coating area 21 and the blank area 22 corresponding to the support roller 120 and the stretching roller 140, respectively. The portion of the stretching roller 140 that contacts the electrode 20 protrudes beyond the surface of the support roller 120, thereby applying greater tension to the blank area 22 of the electrode 20 to achieve extension. When the incoming material of the electrode 20 changes, the drive member 200 can drive the mandrel 110 to rotate around its own axis. At this time, the eccentric wheel 130 will also rotate with the mandrel 110, causing the axis of the outer ring of the eccentric wheel 130, i.e., the axis of the stretching roller 140, to also rotate around the axis of the mandrel 110, thereby adjusting the height of the portion of the stretching roller 140 that contacts the electrode 20 protruding beyond the surface of the support roller 120. Therefore, by driving the mandrel 110 to rotate via the drive member 200, the stretching effect of the stretching assembly 100 on the blank area 22 of the electrode 20 can be adjusted in real time, making adjustment more convenient.

[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0060] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A stretching assembly characterized by, The stretching assembly comprises a mandrel, a supporting roller, an eccentric wheel and a stretching roller, the supporting roller is rotatably sleeved on the mandrel and coaxially arranged with the mandrel, the eccentric wheel has an inner ring and an outer ring arranged eccentrically relative to the inner ring, the inner ring is fixedly sleeved on the mandrel and coaxially arranged with the mandrel, the stretching roller is rotatably sleeved on the outer ring and coaxially arranged with the outer ring, and the supporting roller and the stretching roller are alternately arranged along the axial direction of the mandrel. The pole piece can pass through the stretching assembly, and the coating area and the blank area correspond to the supporting roller and the stretching roller respectively, the part of the stretching roller in contact with the pole piece protrudes from the surface of the supporting roller, and when the mandrel rotates around its axis, the eccentric wheel can rotate with the mandrel, and the axis of the stretching roller rotates around the axis of the mandrel, so as to adjust the height of the part of the stretching roller in contact with the pole piece protruding from the surface of the supporting roller, the surface of the stretching roller is covered with a wear-resistant layer, the wear-resistant layer comprises a plurality of material bands sleeved on each other, and the widths of the plurality of material bands decrease from inside to outside, so as to form a chamfer structure at the two side edges of the stretching roller.

2. The drawing assembly of claim 1, wherein, The mandrel is provided with a first bearing at both ends.

3. The drawing assembly of claim 1, wherein, The supporting roller is rotatably sleeved on the mandrel through a second bearing, and the stretching roller is rotatably sleeved on the outer ring through a third bearing.

4. An extension device, characterized in that The stretching assembly comprises: The stretching assembly according to any one of claims 1 to 3; And The mandrel is drivingly connected with a driving member, and the mandrel can rotate around its axis under the driving of the driving member.

5. The extension device of claim 4, wherein, The driving member is a servo motor, and the rotating shaft of the servo motor is connected with the mandrel through a shaft coupling.

6. The extension device of claim 4, wherein, The stretching assembly further comprises a first passing roller and a second passing roller arranged upstream and downstream of the stretching assembly respectively, and the pole piece can pass through the first passing roller and the second passing roller to form an included angle on the stretching assembly.

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