Tab stretching device for full tab rolling process

Abstract

The utility model belongs to the technical field of pole lug stretching devices, in particular to a pole lug stretching device for a full pole lug rolling process, and provides the following scheme that the pole lug stretching device comprises a main shaft pole piece, the rear side of the pole piece is in sliding contact with a main shaft, and a feeding flattening steel roller is arranged at the bottom of the main shaft; the discharge flattening steel roller is positioned at the top of the main shaft; according to the utility model, the position of the stretching sleeve can be conveniently adjusted, the stretching sleeve is resistant to abrasion, and steps with different curved surfaces and thicknesses can be manufactured in a D printing or injection molding manner, so that the stretching sleeve is convenient to use, and the production efficiency is greatly improved. And a stretching mode combination is provided, so that stretching effects of different degrees can be provided for the tab and the edge of the material area at different stages, the edge extension of the pole piece is consistent with that of the material area, the flatness of the pole piece is ensured, and the breakage of the pole piece is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of electrode stretching devices, and in particular to an electrode stretching device for the full electrode rolling process. Background Technology

[0002] In the production process of lithium-ion battery electrodes, aluminum foil or copper foil is usually used as the current collector. During the electrode rolling process, the electrode coating area usually has an extension of 0.3%-2%. However, the edge of the electrode material area and the current collector foil area usually cannot maintain the same extension as the center of the material area, which leads to excessive tension at the edge of the foil and breakage.

[0003] After the tab is stretched, fishtail patterns (45° patterns) are easily formed at the junction of the material area and the foil. If the tab is stretched too much, wavy edges are easily formed at the tab. The tab support is poor, which has an adverse effect on the winding and flattening process. Controlling the degree of stretching is particularly important in the process of electrode rolling.

[0004] Normally, differential stretching is used to increase the stretching of the edge tabs during the electrode rolling process. However, Teflon bonding has the following disadvantages: 1. The position is not easy to adjust after bonding; 2. The bonding thickness is not easy to adjust, especially in scenarios requiring gradient stretching; 3. It is not wear-resistant; 4. Teflon bonding seams are prone to breakage. Therefore, this utility model proposes an electrode tab stretching device for the full tab rolling process to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to solve the shortcomings of the existing technology, namely: 1. the position is not easy to adjust after attachment; 2. the attachment thickness is not easy to adjust, especially in scenarios requiring gradient stretching; 3. it is not wear-resistant; 4. the Teflon attachment seam is prone to breakage. Therefore, a tab stretching device for the full tab rolling process is proposed.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An electrode stretching device for the full electrode rolling process, comprising:

[0008] spindle;

[0009] The electrode sheet has its rear side in sliding contact with the main shaft;

[0010] A feeding and flattening steel roller is located at the bottom of the main shaft;

[0011] The discharge flattening steel roller is located at the top of the main shaft;

[0012] The feeding mechanism and the discharging mechanism are both coordinated with the main shaft;

[0013] The sleeve mechanism consists of two sets, which are respectively coordinated with the feeding mechanism and the discharging mechanism.

[0014] As a preferred embodiment of this utility model, the feeding mechanism includes: a feeding flattening floating roller, a feeding fixed passing roller, a feeding tension roller, and a feeding horizontal roller;

[0015] The feeding flattening floating roller is located on top of the feeding flattening steel roller, the feeding fixed passing roller is located on top of the feeding flattening floating roller, the feeding tension roller is located on top of the feeding fixed passing roller, the feeding horizontal roller is located on top of the feeding tension roller, and the feeding horizontal roller is located at the bottom of the main shaft.

[0016] As a preferred embodiment of this utility model, the discharge mechanism includes: a discharge horizontal roller, a discharge tension roller, a discharge fixing roller, and a discharge flattening floating roller;

[0017] The discharge flattening floating roller is located at the bottom of the discharge flattening steel roller, the discharge fixing roller is located at the bottom of the discharge flattening floating roller, the discharge tension roller is located at the bottom of the discharge fixing roller, the discharge horizontal roller is located at the bottom of the discharge tension roller, and the discharge horizontal roller is located at the top of the main shaft.

[0018] As a preferred embodiment of the present invention, the sleeve mechanism includes: a sleeve body and a locking collar;

[0019] The sleeve body and the locking collar are in sliding contact with the feed flattening float roller, the feed tension roller, the discharge tension roller and the discharge flattening float roller, respectively, and the sleeve body is in sliding contact with the locking collar.

[0020] As a preferred embodiment of this utility model, a plurality of docking blocks arranged at equal intervals are fixedly installed on the sleeve body, and a plurality of docking grooves arranged at equal intervals are opened on the locking collar, with the outer side of the docking block slidingly contacting the inner wall of the docking groove.

[0021] In a preferred embodiment of this utility model, the electrode sheet is in sliding contact with the feeding flattening steel roller, the feeding flattening floating roller, the feeding fixed passing roller, the feeding tension roller, the feeding horizontal roller, the discharging horizontal roller, the discharging tension roller, the discharging fixed passing roller, the discharging flattening floating roller, and the discharging flattening steel roller. Beneficial effects

[0022] In this invention, the stretching sleeve can be easily adjusted in position and is wear-resistant. It can also be used to create steps with different curvatures and thicknesses through 3D printing or injection molding. Furthermore, it provides a combination of stretching methods that can provide different degrees of stretching effect on the tabs and material area edges at different stages to ensure that the edge extension of the electrode sheet is consistent with the material area, ensuring the flatness of the electrode sheet and reducing electrode sheet breakage. Attached Figure Description

[0023] Figure 1This is a top-view three-dimensional view of the present invention;

[0024] Figure 2 This is a cross-sectional view of the feeding and flattening floating roller of this utility model;

[0025] Figure 3 This is a cross-sectional view of the feed tension roller of this utility model;

[0026] Figure 4 This is a cross-sectional view of the discharge flattening auxiliary roller and the discharge tension roller of this utility model;

[0027] Figure 5 This is a bottom view of the feeding and flattening floating roller of this utility model;

[0028] Figure 6 This is a three-dimensional view of the sleeve body and locking collar of this utility model;

[0029] Figure 7 This is a front view of the sleeve of this utility model;

[0030] Figure 8 Appendix of this utility model Figure 7 Enlarged view of A in the middle.

[0031] In the diagram: 1. Feeding and flattening steel roller; 2. Feeding and flattening floating roller; 3. Feeding fixed guide roller; 4. Feeding tension roller; 5. Feeding horizontal roller; 6. Main roller; 7. Discharge horizontal roller; 8. Discharge tension roller; 9. Discharge fixed guide roller; 10. Discharge flattening floating roller; 11. Discharge flattening steel roller; 12. Sleeve body; 13. Locking collar; 14. Electrode. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example

[0033] Reference Figures 1-8 An electrode stretching device for the full electrode rolling process, comprising:

[0034] Spindle 6;

[0035] Electrode 14, the rear side of electrode 14 is in sliding contact with main shaft 6;

[0036] Feed flattening steel roller 1, the feed flattening steel roller is located at the bottom of the main shaft 6;

[0037] The discharge flattening steel roller 11 is located at the top of the main shaft 6;

[0038] The feeding mechanism and the discharging mechanism are both coordinated with the main shaft 6;

[0039] The sleeve mechanism consists of two sets, which are respectively coordinated with the feeding mechanism and the discharging mechanism.

[0040] With the above structure, the stretch sleeve can be easily adjusted in position and is wear-resistant. It can also be made into steps with different curvatures and thicknesses by 3D printing or injection molding. It also provides a combination of stretching methods, which can provide different degrees of stretching effect on the tab and the edge of the material area at different stages, so as to ensure that the edge extension of the electrode 14 is consistent with the material area, ensure the flatness of the electrode 14, and reduce the breakage of the electrode 14.

[0041] As a preferred embodiment of the present invention, the feeding mechanism includes: a feeding flattening floating roller 2, a feeding fixed passing roller 3, a feeding tension roller 4, and a feeding horizontal roller 5;

[0042] The feeding flattening floating roller 2 is located on top of the feeding flattening steel roller 1, the feeding fixed roller 3 is located on top of the feeding flattening floating roller 2, the feeding tension roller 4 is located on top of the feeding fixed roller 3, the feeding horizontal roller 5 is located on top of the feeding tension roller 4, and the feeding horizontal roller 5 is located at the bottom of the main shaft 6.

[0043] As a preferred embodiment of the present invention, the discharge mechanism includes: a discharge horizontal roller 7, a discharge tension roller 8, a discharge fixing roller 9, and a discharge flattening floating roller 10;

[0044] The discharge flattening floating roller 10 is located at the bottom of the discharge flattening steel roller 11, the discharge fixing roller 9 is located at the bottom of the discharge flattening floating roller 10, the discharge tension roller 8 is located at the bottom of the discharge fixing roller 9, the discharge horizontal roller 7 is located at the bottom of the discharge tension roller 8, and the discharge horizontal roller 7 is located at the top of the main shaft 6.

[0045] As a preferred embodiment of the present invention, the sleeve mechanism includes: a sleeve body 12 and a locking collar 13;

[0046] The sleeve body 12 and the locking collar 13 are in sliding contact with the feeding flattening floating roller 2, the feeding tension roller 4, the discharging tension roller 8 and the discharging flattening floating roller 10 respectively, and the sleeve body 12 is in sliding contact with the locking collar 13.

[0047] As a preferred embodiment of this utility model, a plurality of docking blocks arranged at equal intervals are fixedly installed on the sleeve body 12, and a plurality of docking grooves arranged at equal intervals are opened on the locking collar 13, with the outer side of the docking block sliding in contact with the inner wall of the docking groove.

[0048] As a preferred embodiment of this utility model, the electrode 14 is in sliding contact with the feeding flattening steel roller 1, the feeding flattening floating roller 2, the feeding fixed passing roller 3, the feeding tension roller 4, the feeding horizontal roller 5, the discharging horizontal roller 7, the discharging tension roller 8, the discharging fixed passing roller 9, the discharging flattening floating roller 10, and the discharging flattening steel roller 11.

[0049] The working principle of this utility model is as follows: The electrode sheet 14 is fed through the feeding flattening steel roller 1, the feeding flattening floating roller 2, the feeding tension roller 4, and the feeding horizontal adjustment roller in sequence. The discharge is then processed through the discharge horizontal adjustment roller, the discharge tension roller 8, the discharge flattening steel roller 11, and the discharge flattening floating roller 10 in sequence. The flattening and stretching of the electrode sheet 14 mainly relies on Teflon coating on the flattening rollers of the feeding / discharging flattening mechanism to achieve differential stretching. This, combined with the flattening tension, ensures consistent stretching of the electrode sheet 14. The sleeve body 12 consists of a thin-walled area and a sleeve flange. The sleeve body 12 and the locking collar 13 are locked and fixed to the roller by countersunk bolts and nuts. The inner diameter of the sleeve is the same as the roller diameter. The sleeve body 12 is structured into a thin-walled area for stretching and a tensioning and fixing sleeve flange. Locking collar 13 and countersunk bolts lock the roller body, preventing displacement on the roller. The tension can be adjusted by adjusting the distance between locking collar 13 and sleeve flange, allowing the sleeve to move freely and lock on the roller body. Teflon for edge tab stretching is replaced with stretching sleeves. The sleeves are set on the feed / discharge flattening rollers and feed / discharge tension rollers 8, totaling 4 sets, 2 in each set. They are installed on both sides of the roller body with a spacing equal to the width of the material area. When the electrode 14 is running, the material area is in contact with the roller body, and the electrode foil area and ceramic area are in contact with the thin-walled area of ​​the stretching sleeve. Using the differential stretching principle, the linear velocity of the stretching area is greater than that of the material area, achieving synchronous extension. Different sleeves are set according to the stretching state at different stages, and their positions are also finely adjusted.

[0050] The tension sleeve is made of self-lubricating engineering plastic - polyetheretherketone (PEEK).

[0051] Sleeve thickness design - simplified calculation of stretching:

[0052] r: Roller diameter; ш: Roller angular velocity; v: Linear velocity / belt speed

[0053] y: elongation; n: Teflon thickness / sleeve thickness

[0054] ш*t*r=v*t

[0055] ш*t*(r+n)=v1*t=v*t*(1+y)

[0056] ш=r*v=(r+n)*v1

[0057] y = n / r;

[0058] Taking a 3-inch roller diameter as an example, when the elongation is 0.5%-1%, the thickness of the stretch layer should be 381μm-762μm;

[0059] 4. Degree of elongation: Elongation at the foil edge: 1-2mm inward from the foil edge > Elongation within the foil area > Elongation in the ceramic area > Elongation in the thinned material area: 0.5-2mm inward from the material edge.

[0060] 5. Implementation method:

[0061] 1) Feed pre-stretch sleeve - feed flattening floating roller 2:

[0062] a. Set the edge angle of the pre-stretched sleeve foil area at 5-25° to increase the stretching of the edge tabs and avoid cracking and breakage of the tab edges after rolling.

[0063] b. Set a step, with the thickness of the sleeve in the foil area greater than the thickness of the sleeve in the ceramic area;

[0064] c. Pre-extend the thinning zone in the material area, and set a chamfer on the edge of the sleeve;

[0065] 2) Feed pre-stretch compensation sleeve - feed tension roller 4:

[0066] a. The edge of the feed pre-stretching compensation sleeve foil area is chamfered at 5-25° to compensate for the stretching of the edge tabs and prevent the edge tabs from cracking after rolling.

[0067] b. Move the step back to avoid excessive stretching between the material area and the ceramic coating area.

[0068] 3) Discharge tension compensation sleeve - discharge tension roller 8 + discharge flattening floating roller 10:

[0069] a. The thickness of the discharge stretching sleeve is reduced, and the step is eliminated to ensure that the electrode lugs are flattened, avoiding overstretching of the electrode lugs, while ensuring the support of the electrode lugs.

[0070] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A tab stretching device for a full tab roll-pressing process, characterized by, include Main spindle (6); The electrode (14) has a rear side that makes sliding contact with the main shaft (6); Feed flattening steel roller (1), which is located at the bottom of the main shaft (6); The discharge flattening steel roller (11) is located at the top of the main shaft (6); The feeding mechanism and the discharging mechanism are both coordinated with the main shaft (6); The sleeve mechanism consists of two sets, which are respectively coordinated with the feeding mechanism and the discharging mechanism.

2. A tab stretching device for a full tab roll-pressing process according to claim 1, wherein The feeding mechanism includes: a feeding flattening floating roller (2), a feeding fixed passing roller (3), a feeding tension roller (4), and a feeding horizontal roller (5). The feeding flattening floating roller (2) is located at the top of the feeding flattening steel roller (1), the feeding fixed passing roller (3) is located at the top of the feeding flattening floating roller (2), the feeding tension roller (4) is located at the top of the feeding fixed passing roller (3), the feeding horizontal roller (5) is located at the top of the feeding tension roller (4), and the feeding horizontal roller (5) is located at the bottom of the main shaft (6).

3. A tab stretching device for full tab roll-pressing process according to claim 1, characterized in that, The discharge mechanism includes: a discharge horizontal roller (7), a discharge tension roller (8), a discharge fixed guide roller (9), and a discharge flattening floating roller (10). The discharge flattening floating roller (10) is located at the bottom of the discharge flattening steel roller (11), the discharge fixing roller (9) is located at the bottom of the discharge flattening floating roller (10), the discharge tension roller (8) is located at the bottom of the discharge fixing roller (9), the discharge horizontal roller (7) is located at the bottom of the discharge tension roller (8), and the discharge horizontal roller (7) is located at the top of the main shaft (6).

4. A tab stretching device for full tab roll-pressing process according to claim 1, wherein The sleeve mechanism includes: a sleeve body (12) and a locking collar (13). The sleeve body (12) and the locking collar (13) are in sliding contact with the feeding flattening floating roller (2), the feeding tension roller (4), the discharge tension roller (8) and the discharge flattening floating roller (10), respectively, and the sleeve body (12) is in sliding contact with the locking collar (13).

5. A tab stretching device for a full tab roll-pressing process according to claim 4, wherein The sleeve body (12) is fixedly installed with multiple docking blocks arranged at equal intervals, and the locking collar (13) is provided with multiple docking grooves arranged at equal intervals. The outer side of the docking block slides in contact with the inner wall of the docking groove.

6. A tab stretching device for full tab roll-pressing process according to claim 1, wherein The electrode (14) is in sliding contact with the feeding flattening steel roller (1), the feeding flattening floating roller (2), the feeding fixed passing roller (3), the feeding tension roller (4), the feeding horizontal roller (5), the discharging horizontal roller (7), the discharging tension roller (8), the discharging fixed passing roller (9), the discharging flattening floating roller (10), and the discharging flattening steel roller (11), respectively.

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