Composite roller set and composite equipment
By using a pair of pressing rollers with large and small rollers with dislocations during cell preparation, the bending problem of the pole sheet and the diaphragm belt during pressing is solved, the stacking alignment and packaging quality of the cell are improved, and the production cost is reduced.
Patent Information
- Application Number
- CN202421618464.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-07-09
AI Technical Summary
During the battery cell preparation process, the pole plate and the diaphragm belt are prone to bend when pressed to form a "tile-shaped" structure, which makes it difficult to align the lamination process and affects the battery packaging and cell quality.
Multiple sets of press roller pairs are adopted, in which large rollers and small rollers are arranged alternately to form a dislocation structure, providing alternating pressure and tension, and reducing bending of the composite tape.
It effectively reduces the bending of the composite tape, improves the stacking alignment and packaging quality of the battery cell, and reduces production costs.
Smart Images
Figure CN223218309U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of battery preparation equipment, and in particular to a composite roller group and composite equipment. Background Art
[0002] The battery cell structure prepared by the stacking method is as follows: the negative electrode sheet is compounded between two layers of separators, and then the positive electrode sheet is compounded on the surface of the upper or lower separator. By staggered stacking, the stacked battery cell has a stacked structure of separator-positive electrode sheet-separator-negative electrode sheet-separator, such as Figure 1 shown.
[0003] In order to make the positive / negative electrode composite diaphragm, during the formation of the laminated strip structure, a roller pair formed by an upper and lower roller is usually used to press the electrode (positive electrode and / or negative electrode) and the diaphragm strip together to form a composite material strip. Figure 2 However, due to the thickness variation and the different ductility of the pole piece and the diaphragm, the pole piece and the diaphragm strip are prone to bending after being rolled, showing a "tile shape", as shown in the figure. Figure 3 As shown, the stacking process is difficult to align, which not only affects subsequent processes such as packaging, but also becomes the cause of battery failure.
[0004] Application Contents
[0005] One of the purposes of this application is to provide a new composite roller group, which is equipped with a plurality of pressure roller pairs consisting of large rollers and small rollers, and the large rollers and small rollers of the plurality of pressure roller pairs are arranged alternately, so that the pressure directions of the pole pieces and the diaphragms are alternated, thereby reducing the "tile-shaped" deformation of the composite material strip.
[0006] Another object of the present application is to provide a composite device.
[0007] In a first aspect, the present application discloses a composite roller assembly comprising at least two pairs of pressing rollers sequentially arranged along a traveling direction of a material strip;
[0008] Each of the pressure roller pairs includes a large roller with a larger diameter and a small roller with a smaller diameter;
[0009] The large rollers and the small rollers of two adjacent groups of pressure roller pairs are staggered.
[0010] Furthermore, in some embodiments of the present application, in the composite roller set, the diameters of the large rollers are the same, and the diameters of the small rollers are the same.
[0011] Furthermore, in some embodiments of the present application, in the composite roller set, the diameter of the small roller is 50% to 85% of the diameter of the large roller.
[0012] Furthermore, in some embodiments of the present application, the composite roller group includes an even number of pairs of pressure rollers.
[0013] Furthermore, in some embodiments of the present application, the diameter of the small roller is not less than 50 mm.
[0014] Furthermore, in some embodiments of the present application, a gap with adjustable width for the material strip to pass through is provided between the large roller and the small roller in each of the pressing roller pairs;
[0015] The composite roller set includes a first driving device for adjusting the gap;
[0016] The first driving device is connected to the pressure roller pair.
[0017] Furthermore, in some embodiments of the present application, the first driving device includes a plurality of first drivers connected to the pressure roller pairs in a one-to-one correspondence, and each pressure roller pair is individually driven by the corresponding first driver.
[0018] Furthermore, in some embodiments of the present application, there is a spacing between adjacent pairs of pressing rollers, and the spacing is adjustable;
[0019] The pressure roller pair further includes a second driving device for adjusting the distance; the second driving device is connected to the pressure roller pair.
[0020] Furthermore, in some embodiments of the present application, the composite roller group further includes a third driving device corresponding one-to-one to the large roller and the small roller of the pressure roller pair;
[0021] The small roller and the large roller are driven individually by the corresponding third driving devices.
[0022] In a second aspect, the present application further provides a composite device, comprising:
[0023] Unwinding mechanism, used for unwinding the pole piece tape and diaphragm tape;
[0024] A cutting mechanism for cutting the electrode strip into segments to form individual pieces;
[0025] The composite mechanism includes the composite roller group described in the first aspect, which is used to composite the single sheet onto the diaphragm strip to form a composite material strip.
[0026] Beneficial effects of this application:
[0027] The present application provides a composite roller group for composite rolling of pole pieces and diaphragm strips, wherein the composite roller group includes at least two groups of pressure roller pairs, and each pressure roller pair includes a large roller with a larger diameter and a small roller with a smaller diameter; due to the different diameters of the large roller and the small roller, the composite material strip formed by the rolled pole piece and diaphragm strip is subjected to different forces on both sides, and it bends to form a "tile-type" structure; at the same time, the large rollers and small rollers of multiple groups of pressure roller pairs are alternately arranged, so that when the same composite material strip is subjected to pressure applied by different pressure roller pairs, the diameters of the rollers applying pressure change alternately, causing the already bent composite material strip to bend in the opposite direction, offsetting its tile-type structure, and reducing the occurrence of bending of the composite material strip passing through the composite roller group. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 A structural diagram of a stack of pole pieces and diaphragms of a battery cell in the prior art;
[0029] Figure 2 It is a schematic diagram of the composite process flow of a stacking machine for battery cells in the prior art;
[0030] Figure 3 It is a structural schematic diagram of a composite mechanism in a stacking machine for battery cells in the prior art;
[0031] Figure 4 A schematic structural diagram of a composite device for a battery cell provided in some embodiments of the present application;
[0032] Figure 5 A schematic diagram of the longitudinal movement of a floating roller when using a composite device for a battery cell provided in some embodiments of the present application;
[0033] Among them, 10-first pressing roller pair, 11-first large roller, 12-first small roller, 20-second pressing roller pair, 21-second large roller, 22-second small roller, 30-first electrode strip, 31-first single piece, 40-second electrode strip, 41-second single piece, 70-diaphragm strip, 111-diaphragm unwinding mechanism, 112-first electrode unwinding mechanism, 113-second electrode unwinding mechanism, 121-first cutting mechanism, 122-second cutting mechanism, 131-first composite roller group, 132-second composite roller group. DETAILED DESCRIPTION
[0034] In order to better explain the present application, the present application is described in detail with reference to the implementation methods of the present application, and the main content of the present application is further clarified in combination with specific examples, but the content of the present application is not limited to the following examples.
[0035] In the description of this application, it should be understood that the terms "thickness," "upper," "lower," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the term "plurality" means two or more, unless otherwise specifically defined.
[0036] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.
[0037] In the battery cells of laminated batteries, the electrodes and diaphragm strips are alternately stacked. To press the electrodes and diaphragm strips together, the electrodes need to be rolled and laminated onto one side of the diaphragm strip during the manufacturing process. However, since the electrodes are laminated onto the diaphragm strip in sections, there are certain gaps between adjacent electrodes. In addition, due to the different materials, the ductility of the electrodes and diaphragm strips varies significantly. Therefore, during the lamination process, the composite material strip tends to bend toward one side of the electrode, forming a "tile-shaped" structure. This makes it difficult to align the composite material strips during the lamination process, resulting in a large number of gaps between the laminated sheets, affecting the packaging of the battery cells and, in turn, the performance of the battery cells. Based on this problem, the applicant proposed a new composite roller group in this application. Compared with the existing single roller pair for pressing the composite strip, it uses multiple groups of roller pairs to apply pressure to the composite strip. The rollers in the multiple roller pairs are a combination of large rollers with larger diameters and small rollers with smaller diameters. The multiple roller pairs alternate the positions of large rollers and small rollers to roll the composite strip, providing pressure and tension in alternating reverse directions for the composite strip, releasing the stress of the composite strip, reducing its bending, and avoiding the "shingle-shaped" structure. Specifically:
[0038] A composite roller set, see Figure 4 , comprising at least two groups of pressing roller pairs arranged in sequence along the traveling direction of the material strip;
[0039] Each of the pressure roller pairs includes a large roller with a larger diameter and a small roller with a smaller diameter;
[0040] The large rollers and the small rollers of two adjacent groups of pressure roller pairs are staggered.
[0041] In the present application, the pressing roller pairs are sequentially arranged along the traveling direction of the material strip, so that when the material strip passes through the gap between the rollers of the pressing roller pairs, each of the pressing roller pairs applies pressure to the material strip.
[0042] It should be noted that the diaphragm strip, the composite structure formed by the diaphragm strip and the pole piece, and the composite structure formed by multiple diaphragm strips and multiple pole pieces in this application are collectively referred to as "material strips", and the composite material strip is a "material strip" of a multilayer structure formed by a composite of at least one diaphragm strip and at least one pole piece.
[0043] Among them, "the large rollers and the small rollers of the two adjacent roller pairs are staggered" should be understood as: the large rollers and small rollers of the two adjacent roller pairs are respectively arranged on both sides of the material belt, and the large rollers and small rollers of the two adjacent roller pairs are respectively located in opposite directions of the material belt. Taking the two adjacent roller pairs, namely the first roller pair 10 and the second roller pair 20, as an example, the first roller pair includes a first large roller 11 and a first small roller 12, and the second roller pair includes a second large roller 21 and a second small roller 22, wherein the first large roller is located above the material belt, the first small roller is located below the material belt, and is arranged corresponding to the first large roller; the second large roller is located below the material belt, the second small roller is located above the material belt, and is arranged corresponding to the second large roller; that is: the first large roller and the second small roller are located on the same side of the material belt, and the first small roller and the second large roller are located on the same side of the material belt.
[0044] In some embodiments, the composite roller group includes an even number of pressure roller pairs, and preferably the composite roller group includes at least 4 pressure roller pairs to more completely release the stress of the composite material strip during the rolling process and better avoid the appearance of its tile-type structure.
[0045] The composite roller group provided in the present application uses a pair of pressure rollers for composite to provide pressure for the composite of the diaphragm strip and the electrode piece, and can also release the stress in the diaphragm strip and the electrode piece. There is no need to add equipment for releasing the stress of the diaphragm strip and the electrode piece before and / or after composite, or to improve the tile shape of the composite material strip, thereby reducing production costs and improving the consistency of battery cell quality.
[0046] In some embodiments, in the composite roller group, the diameters of all the large rollers are the same or infinitely close to the same, and the diameters of the small rollers are the same or infinitely close to the same, so that the pressures alternately applied to both sides of the composite strip are close to the same, and the tile-shaped condition is better improved.
[0047] Furthermore, in the composite roller group, the diameter of the small roller is 50% to 85% of the diameter of the large roller, preferably, the diameter of the small roller is 67% to 75% of the diameter of the large roller, and more preferably, the diameter of the small roller is 70% of the diameter of the large roller.
[0048] The diameter ratio of the large roller to the small roller should be neither too large nor too small. A too large ratio will result in the small roller being too small, which will locally exert excessive pressure on the composite strip and easily lead to severe overstressing of the composite strip, especially at its edges. On the other hand, a too small ratio will lead to incomplete stress release and insufficient improvement of the tile shape, which will affect the quality of the battery cell. For example, the diameter of the large roller can be 150-300mm; the diameter of the small roller can be 120-255mm. Furthermore, the diameter of the small roller should be no less than 50mm.
[0049] In addition, in order to solve the problem of overpressure on the small roller, the present application also provides a first driving device for driving the large roller or the small roller, which is used to move the large roller or the small roller in the pressure roller pair longitudinally, and adjust the width of the gap between the large roller and the small roller in each pressure roller pair for the material strip to pass through, so that the electrode is pressed down when passing through, and the gap between the electrode pieces (when the electrode piece strip is cut into a single piece, there is a certain distance between adjacent electrode pieces) passes through, and the pressure roller pair does not apply pressure to the material strip, thereby avoiding the problem of overpressure on the edge of the electrode piece.
[0050] The first driving device is connected to the large roller or the small roller in the pressure roller pair, preferably connected to the large roller in the pressure roller pair, to reduce the pressure variation amplitude.
[0051] The first driving device includes a plurality of first drivers connected to the pressure roller pairs in a one-to-one correspondence, and each pressure roller pair is driven individually by the corresponding first driver.
[0052] In some embodiments, in order to accommodate pole pieces of different widths, there is a spacing between adjacent pairs of pressure rollers, and the spacing is adjustable; the pressure roller pairs include a second driving device for adjusting the spacing; the second driving device is connected to the pressure roller pairs.
[0053] Among them, the pressure roller pair also includes a mounting frame for installing large rollers and small rollers, and the second driving device includes multiple second drivers, each of which is connected to the mounting frame of a pressure roller pair, and is used to drive the large roller and small roller of the pressure roller pair to move synchronously along the traveling direction of the material belt (lateral movement), so that it is suitable for pole pieces of different widths.
[0054] In some embodiments, the composite roller assembly further includes a third drive device corresponding one-to-one with the large roller and the small roller of the pressure roller pair; the small roller and the large roller are independently driven by the corresponding third drive device, so that each pressure roller pair can provide driving force for the material strip to move forward. The third drive device also includes a plurality of third drivers connected one-to-one with the large roller and the small roller of the pressure roller pair.
[0055] Preferably, during use of the composite roller group, at any time, there is at least one pair of pressure rollers providing pressure and driving force to the material strip, so that the pressure and driving force on the material strip will not drop to zero instantaneously or approach 0 infinitely, thereby improving processing efficiency and consistency of battery cell quality.
[0056] It should be noted that the first drive, second drive and third drive are all existing technologies, which can be electric drives, pneumatic drives and other existing drive devices. Therefore, they will not be described in detail one by one in this application, and will not affect the understanding of this application by technical personnel in this field.
[0057] In the second aspect, the present application also provides a composite device, see Figure 5 ,include:
[0058] Unwinding mechanism, used for unwinding the pole piece tape and diaphragm tape;
[0059] A cutting mechanism for cutting the electrode strip into segments to form individual pieces;
[0060] The composite mechanism includes the composite roller group described in the first aspect, which is used to composite the single sheet onto the diaphragm strip to form a composite material strip.
[0061] Depending on the unwinding material strip, the unwinding mechanism can be divided into a diaphragm unwinding mechanism 111, a first electrode sheet unwinding mechanism 112, and a second electrode sheet unwinding mechanism 113. The cutting mechanism includes a first cutting mechanism 121 and a second cutting mechanism 122; the first electrode sheet strip 30 and the second electrode sheet strip 40 are cut into a plurality of first single sheets 31 and a second single sheet 41 by the first cutting mechanism and the second cutting mechanism respectively; the plurality of first single sheets and second single sheets are alternately arranged on both sides of the diaphragm strip 70;
[0062] The diaphragm unwinding mechanism and the first electrode sheet unwinding mechanism are located upstream of the first cutting mechanism; the second electrode sheet unwinding mechanism is located upstream of the second cutting mechanism and is used to unwind the second electrode sheet strip to the second cutting mechanism. The compounding mechanism includes a first compounding mechanism and a second compounding mechanism, which are respectively located downstream of the first and second cutting mechanisms and are used to compound the first and second single sheets with the diaphragm strip, respectively.
[0063] According to the composite process of the electrode and the diaphragm strip, the arrangement order of the first cutting mechanism, the second cutting mechanism, the first composite mechanism 131 and the second composite mechanism 132 is as follows:
[0064] A first cutting mechanism, a first compounding mechanism, a second cutting mechanism and a second compounding mechanism.
[0065] The first electrode strip can be a positive electrode strip or a negative electrode strip, and correspondingly, the second electrode strip can be a negative electrode strip or a positive electrode strip.
[0066] In some embodiments, two first cutting mechanisms may be provided, and two second cutting mechanisms may also be provided.
[0067] During use, two diaphragm tapes and two first electrode tapes are released simultaneously. The first single sheets formed by cutting the two first electrode tapes are alternately formed between the two diaphragm tapes after being compounded by the first compounding mechanism; the two second electrode tapes released simultaneously by the electrode unwinding mechanism are respectively cut into second single sheets by the second cutting mechanism, and are alternately formed on the other side of the two diaphragm tapes (located on the outside of the two diaphragm tapes), and the second single sheets and the composite material strip formed by the first single sheet and the diaphragm tape are compounded into one by the second compounding mechanism.
[0068] Specifically, the first composite mechanism includes a first composite roller group sequentially arranged downstream of the first cutting mechanism; the first composite roller group is used to composite the first single sheet and the diaphragm belt into one; the second composite mechanism includes a second composite roller group sequentially arranged downstream of the second cutting mechanism; the second composite roller group is used to composite the second single sheet and the diaphragm belt into one.
[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A composite roller set, characterized in that: It comprises at least two groups of pressing roller pairs arranged in sequence along the traveling direction of the material strip; Each of the pressure roller pairs includes a large roller with a larger diameter and a small roller with a smaller diameter; The large rollers and the small rollers of two adjacent groups of pressure roller pairs are staggered.
2. The composite roller set according to claim 1, characterized in that: In the composite roller set, the diameters of the large rollers are the same, and the diameters of the small rollers are the same.
3. The composite roller set according to claim 1, characterized in that: In the composite roller set, the diameter of the small roller is 50% to 85% of the diameter of the large roller.
4. The composite roller set according to claim 1, characterized in that: The composite roller group includes an even number of pairs of pressure rollers.
5. The composite roller assembly according to any one of claims 1 to 4, characterized in that: The diameter of the small roller is not less than 50 mm.
6. The composite roller assembly according to any one of claims 1 to 4, characterized in that: A gap with adjustable width for the strip to pass through is provided between the large roller and the small roller in each pair of pressing rollers; The composite roller set includes a first driving device for adjusting the gap; The first driving device is connected to the pressure roller pair.
7. The composite roller set according to claim 6, characterized in that: The first driving device includes a plurality of first drivers connected to the pressure roller pairs in a one-to-one correspondence, and each pressure roller pair is driven individually by the corresponding first driver.
8. The composite roller set according to claim 6, characterized in that: There is a distance between adjacent pairs of pressing rollers, and the distance is adjustable; The pressure roller pair further includes a second driving device for adjusting the distance; the second driving device is connected to the pressure roller pair.
9. The composite roller set according to claim 6, characterized in that: The composite roller group further includes a third driving device corresponding one-to-one to the large roller and the small roller of the pressure roller pair; The small roller and the large roller are driven individually by the corresponding third driving devices.
10. A composite device, characterized in that: include: Unwinding mechanism, used for unwinding the pole piece tape and diaphragm tape; A cutting mechanism for cutting the electrode strip into segments to form individual pieces; A composite mechanism, comprising the composite roller set according to any one of claims 1 to 9, is used to composite the single sheet onto the diaphragm strip to form a composite material strip.