Dry-method electrode rolling film-forming production line
By introducing an extension mechanism into the dry electrode roll forming production line to pre-stretch the uncoated area, the problem of wrinkles in the uncoated area of the electrode sheet after stretching is solved, achieving flatness of the strip and uniform extension of the electrode sheet, thus improving the film forming quality of the production line.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA INNOVATION AVIATION TECH (WUHAN) CO LTD
- Filing Date
- 2025-05-26
- Publication Date
- 2026-05-26
AI Technical Summary
During the dry electrode rolling process, the uncoated area of the electrode sheet is prone to wrinkles after stretching, resulting in uneven lateral elongation of the electrode tabs, which affects the shape of the electrode sheet and the high-speed rolling effect.
The dry electrode roll forming production line uses an extension mechanism to pre-stretch the uncoated area of the strip. The uncoated area is set in parallel by an active roller and multiple extension rollers to reduce the reverse force in the uncoated area, thereby releasing stress during calendering and avoiding wrinkles.
By pre-stretching the uncoated area, the reverse force in the coated area is reduced, ensuring the flatness of the strip and preventing wrinkles from forming on the electrode during the rolling process, thus improving the flatness and consistency of the electrode.
Smart Images
Figure CN224288249U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a dry electrode roll forming production line. Background Technology
[0002] During the rolling process, the longitudinal and transverse dimensions of the positive electrode sheet are extended and enlarged due to the rearrangement of the internal pores of the compacted material in the material zone, resulting in a deterioration in the electrode sheet shape. When the height of the tab increases, the transverse elongation of the tab becomes less consistent, and wrinkles will appear on the electrode sheet under high-speed rolling.
[0003] Therefore, there is an urgent need for a dry electrode roll forming production line to solve the above-mentioned technical problems. Utility Model Content
[0004] The purpose of this invention is to propose a dry electrode roll forming production line that can stretch the electrode sheet in advance to release stress and avoid wrinkles on the electrode sheet.
[0005] To achieve this objective, the present invention adopts the following technical solution:
[0006] A dry electrode roll forming production line includes an extension mechanism, which includes a drive roller arranged opposite to the drive roller and a plurality of extension rollers cooperating with the drive roller. The extension rollers and the drive rollers are used to extend the uncoated area of the material strip. The drive rollers and the extension rollers are arranged in parallel, and the total length of the plurality of extension rollers is less than that of the drive roller.
[0007] This utility model has at least the following beneficial effects:
[0008] Because the strip first passes through the stretching mechanism to stretch the uncoated area, and then passes through the rolling mechanism to calender the coated area, the uncoated area is subjected to stress in advance and the stress is released in advance. Thus, when the coated area of the strip is calendered, the reverse force on the uncoated area is reduced, thereby obtaining a flat strip. The uncoated area of the electrode does not wrinkle after stretching. Attached Figure Description
[0009] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.
[0010] Figure 1 This is a partial structural diagram of the material strip;
[0011] Figure 2A schematic diagram of the dry electrode roll forming production line provided in this embodiment of the utility model;
[0012] Figure 3 A schematic diagram of the extension mechanism provided in this embodiment of the utility model;
[0013] Figure 4 This is a schematic diagram showing the positional relationship between the stretching roller and the material sheet provided in an embodiment of the present invention;
[0014] Figure 5 A schematic diagram showing the positional relationship between the drive roller, the extension roller, and the support roller provided for an embodiment of this utility model;
[0015] Figure 6 A schematic diagram of the structure of the extension roller provided in this embodiment of the utility model;
[0016] Figure 7 This is a schematic diagram of the structure of the rear tensioning mechanism provided in an embodiment of the present utility model;
[0017] Figure 8 A schematic diagram of the structure of the support portion provided in an embodiment of this utility model;
[0018] Figure 9 This is a schematic diagram showing the positional relationship between the rear stretching roller and the material strip provided in an embodiment of the present invention.
[0019] In the picture:
[0020] 1. Unwinding mechanism; 2. Extension mechanism; 21. Drive roller; 22. Extension roller; 23. Support roller; 24. First tension roller; 25. Connecting roller; 3. Front stretching mechanism; 4. Roll pressing mechanism; 5. Rear stretching mechanism; 51. Rear stretching roller; 52. Support part; 521. Annular deformable part; 522. First support ring; 523. Second support ring; 53. Guide roller; 54. Second tension roller; 6. Winding mechanism; 7. Thickness measuring mechanism; 100. Strip; 101. Coated area; 102. Uncoated area; 103. Defect. Detailed Implementation
[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0022] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0024] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0025] Dry electrode preparation is an electrode manufacturing process that omits steps such as drying and NMP solvent recovery. It involves mixing dry powders of electrode active materials, conductive agents, and binders, followed by steps such as fiberization, granulation, and calendering to form a dry film, which is then laminated onto a current collector to obtain a dry electrode.
[0026] like Figure 1As shown, the strip 100 for manufacturing electrodes includes a coated area 101 and an uncoated area 102. In the prior art, during the stretching process, the stretching rollers of the strip 100 do not come into contact with the uncoated area 102. Before calendering, the coated area 101 and the uncoated area 102 are subjected to the same tensile force. During calendering and stretching, the coated area 101 is subjected to pressure, while the uncoated area 102 is not subjected to pressure. Therefore, only the coated area 101 extends along the longitudinal and transverse directions of the strip 100. Consequently, only the coated area 101 is subjected to longitudinal stretching force and additional transverse stretching force. This results in a correspondingly large reaction force in the uncoated area 102. This causes wrinkles to form on the strip 100. To solve the problem of wrinkles occurring in the uncoated area 102 (i.e., the tab) of the electrode after stretching in the prior art, this invention provides a dry electrode roll forming production line that can solve the above-mentioned problem.
[0027] like Figures 2 to 5 As shown, the dry electrode roll forming production line includes an extension mechanism 2. The extension mechanism 2 includes a driving roller 21 arranged opposite to each other and a plurality of extension rollers 22 that cooperate with the driving roller 21. The driving roller 21 and the extension rollers 22 are arranged in parallel. The total length of the plurality of extension rollers 22 is less than that of the driving roller 21. The extension rollers 22 and the driving roller 21 are used to extend the uncoated area 102 of the material strip 100.
[0028] Since the strip 100 first passes through the stretching mechanism 2 to stretch the uncoated area 102, and then passes through the rolling mechanism 4 to calender the coated area 101, the uncoated area 102 is subjected to calendering force in advance and releases stress in advance. Thus, when the strip 100 calenders the coated area 101, the reverse force on the uncoated area 102 is reduced, thereby obtaining a flat strip 100. The uncoated area 102 of the electrode does not wrinkle after stretching.
[0029] like Figure 1 As shown, along the transport direction of the strip 100, the dry electrode roll forming production line also includes an unwinding mechanism 1, a front stretching mechanism 3, a roll forming mechanism 4, a rear stretching mechanism 5, and a winding mechanism 6. These mechanisms are sequentially arranged along the transport direction of the strip 100. The unwinding mechanism 1 releases the rolled strip 100, ensuring accurate placement of the coated electrode sheet. The stretching mechanism 2 extends the uncoated area 102 of the strip 100 to prevent wrinkles after stretching. The front stretching mechanism 3 stretches the strip 100, the roll forming mechanism 4 extends the strip 100, the rear stretching mechanism 5 stretches the strip 100, and the winding mechanism 6 winds the stretched strip 100 into a roll for use in the next process.
[0030] like Figure 5As shown, the multiple extension rollers 22 have a split structure, allowing them to be arranged according to the positions of different uncoated areas 102, ensuring that each uncoated area 102 can be equipped with one extension roller 22. Furthermore, the multiple extension rollers 22 can be coaxially arranged, allowing them to be installed on the same side of the drive roller 21, facilitating spatial arrangement. For example, the extension rollers 22 are connected to the drive roller via couplings, and adjacent extension rollers 22 are connected via couplings. The drive roller is rotatably fixed to a bearing mounting seat to rotate relative to the bearing mounting seat, driving the multiple extension rollers 22 to rotate simultaneously. The drive roller is fixedly connected to the drive component to be driven.
[0031] In other embodiments, the extension roller 22 may be arranged at different positions of the drive roller 21, but it is necessary to ensure that the extension roller 22 is arranged parallel to the drive roller 21. The extension roller 22 is fixed by a bearing mounting seat and can rotate relative to the bearing mounting seat. The extension roller 22 is connected to a drive component to be driven, and the extension roller 22 and the drive component are arranged in a one-to-one correspondence, that is, each extension roller 22 is provided with a corresponding drive component, so that the extension roller 22 is driven to work by different drive components.
[0032] In some embodiments, such as Figure 6 As shown, the multiple stretching rollers 22 are an integral structure. For example, the stretching rollers 22 are connected by connecting rollers 25. The connecting rollers 25 and the stretching rollers 22 are an integral structure. Specifically, they can be integrally molded or integrally welded. The diameter of the connecting rollers 25 is smaller than the diameter of the stretching rollers 22, while the diameters of each stretching roller 22 are the same.
[0033] In some embodiments, along the width direction of the strip 100, the stretching roller 22 is located in the middle and two edges of the strip 100. The width of the stretching roller 22 located in the middle of the strip 100 is W1, and the width of the stretching roller 22 located at the edge of the strip 100 is W2, wherein W1 = 2W2. This arrangement ensures that the uncoated area 102 in the middle of the strip 100 can be completely calendered by the stretching roller 22, thereby improving the calendering quality.
[0034] It should be noted that the length of the stretching roller 22 can be designed according to the length of the tab. Under the same pressure, the smaller the diameter of the stretching roller 22, the greater the stretching. The diameter of the stretching roller 22 can be designed according to the required stretching size.
[0035] To prevent the drive roller 21 from undergoing flexible deformation during long-term operation, please refer to... Figure 3 and Figure 5 In some embodiments, the extension mechanism 2 further includes a support roller 23, which is parallel to the drive roller 21 and located on the opposite side of the extension roller 22. The support roller 23 is used to support the drive roller 21 and can provide a reverse support force to the drive roller 21 to prevent the support roller 23 from being deformed due to long-term compression.
[0036] In some embodiments, such as Figure 3 As shown, the extension mechanism 2 also includes a first tension roller 24, which is arranged in parallel with the drive roller 21. The first tension roller 24 is used to adjust the tension of the material belt 100 to ensure that the material belt 100 remains stable and free from wrinkles or stretching deformation during continuous transmission.
[0037] After the strip 100 is calendered by the rolling mechanism 4, because the strip 100 has a coated area 101 and an uncoated area 102, if there are defects 103 such as pores in the uncoated area 102, the strip 100 will break at the defect 103 during the stretching process. In addition, when the strip 100 in the same batch has defects 103, the location is usually the same. Figure 7 and Figure 8 As shown, the subsequent stretching mechanism 5 includes two opposing rear stretching rollers 51. One of the rear stretching rollers 51 has a support portion 52 on its outer periphery that can move axially along the rear stretching roller 51. The support portion 52 can move axially along the rear stretching roller 51, thus accommodating gaps at different positions in the uncoated area 102. It should be noted that the support portion 52 must avoid gaps; that is, the support portion 52 does not support gaps. The diameter of the support portion 52 is adjustable, which allows it to accommodate strips 100 with coating thicknesses in the coated area 101. The uncoated area 102 contacts and adheres to the support portion 52, and a certain speed difference is generated in the uncoated area 102 to prevent strip breakage after stretching due to pores.
[0038] Specifically, the support part 52 has a ring structure and is sleeved on the outer periphery of the rear stretching roller 51. The support part 52 is interference-fitted with the rear stretching roller 51 to ensure that the support part 52 will not move relative to the rear stretching roller 51 during the rotation of the rear stretching roller 51.
[0039] For example, the support part 52 is an elastic ring, and multiple elastic rings are fitted together as a whole, so that the diameter of the support part 52 can be adjusted. The elastic ring is specifically a rubber ring.
[0040] Of course, in some other embodiments, such as Figure 9As shown, the support portion 52 includes an annular deformable member 521, a first support ring 522, and a second support ring 523. The inner diameter of the first support ring 522 is smaller than the inner diameter of the second support ring 523. The annular deformable member 521, the first support ring 522, and the second support ring 523 are coaxially arranged. The annular deformable member 521 is fixedly connected to the outer peripheral wall of the first support ring 522 and the inner peripheral wall of the second support ring 523, respectively. For example, the annular deformable member 521 is bonded to the outer peripheral wall of the first support ring 522 and the inner peripheral wall of the second support ring 523, respectively. The first support ring 522 and the second support ring 523 can be metal rings or rubber rings. The annular deformable member 521 is filled with a deformation medium, which can be a liquid or a gas. Specifically, the liquid can be water, and the gas can be helium or air.
[0041] In some embodiments, the support portion 52 is formed of Teflon tape segments. The Teflon tape segments can be directly pasted onto the outer periphery of the rear stretching roller 51 according to the position of the pores. Multiple layers of Teflon tape segments can be wrapped around the same position to achieve an adjustable diameter of the support portion 52. In addition, when the next batch has pores and the positions of the pores are different, the Teflon tape can be directly torn off and a new corresponding position can be selected to paste a new Teflon tape to form the support portion 52.
[0042] It should be noted that the side wall of the support part 52 facing the strip 100 is provided with a gap between it and the strip 100, so as to provide space for the strip 100 to stretch and deform during the stretching process.
[0043] Furthermore, the number and position of the support portions 52 are not specifically limited in this invention, but are determined based on the position of the defect 103 in the strip 100. For example, when a defect 103 appears in the middle of the strip 100, the support portion 52 is located in the middle of the rear stretching roller 51, but does not contact the defect 103. Figure 8 As shown, a defect 103 appears on the edge of the strip 100, and the support 52 is located at the end of the rear stretching roller 51 and on one side of the defect 103.
[0044] In some embodiments, continue to refer to Figure 7 The rear stretching mechanism 5 also includes a guide roller 53 and a second tension roller 54. Along the transmission direction of the material belt 100, the second tension roller 54, the guide roller 53 and the rear stretching roller 51 are arranged in sequence. The arrangement of the second tension roller 54 can ensure that the material belt 100 remains stable and free from wrinkles or stretching deformation during continuous transmission.
[0045] In some embodiments, continue to refer to Figure 2 The dry electrode roll forming production line also includes a thickness measuring mechanism 7, which is located between the post stretching mechanism 5 and the winding mechanism 6. It is used to detect the thickness of the strip 100 stretched by the post stretching mechanism 5 in order to obtain the thickness information of the strip 100 wound by the winding mechanism 6.
[0046] The contents of the unwinding mechanism 1, the front stretching mechanism 3, the roller pressing mechanism 4, the thickness measuring mechanism 7, and the winding mechanism 6 are all existing technologies and are not specifically limited in this utility model.
[0047] After the rolled strip 100 is released by the unwinding mechanism 1, the strip first passes through the stretching mechanism 2 to stretch the uncoated area 102 of the strip 100 before calendering, so that the uncoated area 102 of the strip 100 will not wrinkle after stretching. Then it passes through the front stretching mechanism 3 to thin and stretch the strip 100. Then it passes through the rolling mechanism 4 to roll and press the uncoated area 102 and the coated area 101 of the strip 100 as a whole. Then it passes through the rear stretching mechanism 5 to thin and stretch the strip 100. The front stretching mechanism 3 and the rear stretching mechanism 5 provide multiple thinning and stretching for the strip 100. The winding mechanism 6 then winds the stretched strip 100 into a roll for use in the next process.
[0048] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.
Claims
1. A dry electrode roll forming production line, characterized in that, The device includes an extension mechanism (2), which includes an active roller (21) and a plurality of extension rollers (22) that cooperate with the active roller (21). The extension rollers (22) and the active roller (21) are used to extend the uncoated area (102) of the strip (100). The active roller (21) and the extension roller (22) are arranged in parallel. The total length of the plurality of extension rollers (22) is less than that of the active roller (21).
2. The dry electrode roll forming production line according to claim 1, characterized in that, The multiple stretching rollers (22) are of a split structure.
3. The dry electrode roll forming production line according to claim 1, characterized in that, The multiple stretching rollers (22) are an integral structure.
4. The dry electrode roll forming production line according to any one of claims 1-3, characterized in that, Along the width direction of the strip (100), the stretching roller (22) is located in the middle and two edges of the strip (100). The width of the stretching roller (22) located in the middle of the strip (100) is W1, and the width of the stretching roller (22) located at the edge of the strip (100) is W2, where W1 = 2W2.
5. The dry electrode roll forming production line according to any one of claims 1-3, characterized in that, The extension mechanism (2) further includes a support roller (23), which is arranged parallel to the drive roller (21) and is used to support the drive roller (21).
6. The dry electrode roll forming production line according to any one of claims 1-3, characterized in that, The extension mechanism (2) further includes a first tension roller (24), which is arranged parallel to the drive roller (21). The first tension roller (24) is used to adjust the tension of the material belt (100).
7. The dry electrode roll forming production line according to any one of claims 1-3, characterized in that, The dry electrode roll forming production line also includes a post-stretching mechanism (5), which includes two opposing post-stretching rollers (51), one of which has a support part (52) on its outer periphery that can move along the axial direction of the post-stretching roller (51), and the diameter of the support part (52) is adjustable.
8. The dry electrode roll forming production line according to claim 7, characterized in that, The support part (52) is a ring structure and is sleeved on the outer periphery of the rear stretching roller (51).
9. The dry electrode roll forming production line according to claim 8, characterized in that, The support portion (52) is an elastic ring; or, The support portion (52) includes an annular deformable member (521), a first support ring (522), and a second support ring (523). The inner diameter of the first support ring (522) is smaller than the inner diameter of the second support ring (523). The annular deformable member (521), the first support ring (522), and the second support ring (523) are coaxially arranged. The annular deformable member (521) is filled with a deformable medium.
10. The dry electrode roll forming production line according to claim 7, characterized in that, The rear stretching mechanism (5) further includes a guide roller (53) and a second tension roller (54). Along the transmission direction of the material belt (100), the second tension roller (54), the guide roller (53), and the rear stretching roller (51) are arranged in sequence.
11. The dry electrode roll forming production line according to claim 7, characterized in that, The dry electrode roll forming production line also includes an unwinding mechanism (1), a front stretching mechanism (3), a roll forming mechanism (4), and a winding mechanism (6). Along the transmission direction of the material strip (100), the unwinding mechanism (1), the stretching mechanism (2), the front stretching mechanism (3), the roll forming mechanism (4), the rear stretching mechanism (5), and the winding mechanism (6) are arranged in sequence.