Adjustable tab drawing device

Abstract

The utility model discloses an adjustable tab drawing device, which relates to the technical field of lithium battery production and manufacturing, and comprises a tab drawing ring and a detachable multi-layer structure consisting of a plurality of layers of sheet circular rings, and the tab drawing ring is wound on a swing roller; the limiting mechanism comprises a pasting roller section and a drawing groove, the limiting mechanism is wrapped on the tab drawing ring and the swing roller in a partitioned mode, the pasting roller section is tightly attached to the swing roller, and the drawing groove is located on the inner side of the limiting mechanism and matched with the tab drawing ring. The side wall of the drawing groove is propped against the side surface of the tab drawing ring in a limiting manner; and the fixing mechanism is tightly wrapped outside the limiting mechanism. The pole lug drawing ring can be easily installed on an existing swing roller, a production line does not need to be greatly improved, the number of layers and the thickness of the pole lug drawing ring can be adjusted according to actual requirements, and the pole lug drawing ring can adapt to pole pieces of different types and meet different drawing requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production and manufacturing, and particularly relates to an adjustable tab drawing device. Background Art

[0002] At present, the market demands high energy density battery cell designs, and the areal density of the battery cell tab surface also increases accordingly. The too thick tab coating will cause the tab foil of the battery cell current collector to wrinkle and leak outside during the rolling process. To solve this problem, there are generally two existing technical solutions: 1. There are drawing rollers before and after the rolling roller. By increasing the tension and clamping the battery cell tab, the tab is drawn during the process of tape running and winding. First, this solution has the defects of being unable to adapt to old equipment and high modification costs, and the site needs to be re-planned. Because the drawing roller experiments tab stretching through a large-tension pinch roller, when drawing a tab with high requirements for tab stretching in the rolling part, the stretching effect is not sufficient to meet the requirements. For example, for the 46-series large cylindrical full-tab wound battery cell, the tab after being drawn by the drawing roller, especially the positive aluminum foil with a relatively hard material, has serious tape breakage during subsequent cutting, folding or flattening and winding, and the scrap rate increases greatly. For the large-capacity square shell battery cell with stacking or winding and flattening, the number of tab layers of the battery cell is extremely large, and the length can reach more than 20 mm. If the tab stretching is insufficient, there will be serious tape breakage in the subsequent tape running, slitting and assembly processes. 2. Attach multiple layers of Teflon tapes to the subsequent swing roller, and increase the local roller diameter through the Teflon tapes to draw and shape the external tab of the current collector. This solution can achieve different degrees of tab drawing by adjusting different layers, but it needs to be re-attached when producing battery cell rolls with different coating widths, and if the deviation correction position shifts during the process, it needs to be re-attached to adjust, which greatly increases the workload and debugging scrap rate. Summary of the Utility Model

[0003] Technical Problems to be Solved by the Utility Model

[0004] Aiming at the technical problems of serious subsequent tape breakage in the first rolling solution for the wrinkles of the tab foil caused by the external leakage of the battery cell current collector and the increase in workload and debugging scrap rate in the second solution, the utility model provides an adjustable tab drawing device, which can be easily installed on the existing swing roller without major transformation of the production line, and can adjust the number of layers and thickness of the tab drawing ring according to actual needs, and can adapt to different types of tabs and different drawing requirements.

[0005] Technical Solution

[0006] To solve the above problems, the technical solution provided by the utility model is as follows:

[0007] An adjustable tab drawing device, comprising a tab drawing ring, which is a detachable multi-layer structure composed of multiple thin sheet rings, and the tab drawing ring is wound around a swing roll; a limiting mechanism, comprising a roll-attaching section and a drawing groove, the limiting mechanism is wrapped around the tab drawing ring and the swing roll in sections, the roll-attaching section is closely attached to the swing roll, the drawing groove is located inside the limiting mechanism and is adapted to the tab drawing ring, and the side wall of the drawing groove is in limiting contact with the side surface of the tab drawing ring; a fixing mechanism, which is tightly wrapped around the outside of the limiting mechanism.

[0008] The tab drawing ring is composed of multiple thin sheet rings, and the thin sheet rings are detachable, and the number of layers can be adjusted according to actual needs. The thicknesses of different numbers of layers are different, and can be used for different thicknesses of tab materials to be drawn. Moreover, the tab drawing ring can be detached and its position adjusted, and can be used for different widths of coated tab materials to be drawn. The coated width of the tab refers to the width of the active material coated on the tab. It can be easily installed on the existing swing roll without major modification of the production line. And the number of layers and thickness of the tab drawing ring can be adjusted according to actual needs, and it can adapt to different types of tabs and different drawing requirements. The roll-attaching section is closely attached to the swing roll, playing a fixing role to ensure the stability of the whole device on the swing roll. The drawing groove is located inside the limiting mechanism and is adapted to the tab drawing ring, and its side wall is in limiting contact with the side surface of the tab drawing ring, thereby restricting the position of the tab drawing ring and ensuring the stability and consistency during the drawing process. The fixing mechanism is tightly wrapped around the outside of the limiting mechanism, which is used to further strengthen the stability of the whole device and prevent movement or misalignment during operation.

[0009] Optionally, the limiting mechanism is formed by splicing semi-circular parts.

[0010] The limiting mechanism is formed by splicing semi-circular parts instead of a complete circular ring, which can be more easily installed and disassembled, and can also adapt to swing rolls of different diameters.

[0011] Optionally, the thickness of the thin sheet rings of the tab drawing ring is between 0.05 and 0.6 millimeters.

[0012] The thickness range of the thin sheet rings is between 0.05 and 0.6 millimeters, providing greater flexibility and enabling it to adapt to a wide range of tab thickness requirements.

[0013] Optionally, the fixing mechanism is made of elastic, high-temperature resistant and corrosion-resistant materials.

[0014] The fixing mechanism is made of elastic, high-temperature resistant and corrosion-resistant materials, ensuring good performance even under extreme conditions.

[0015] Optionally, the inner wall of the fixing mechanism is provided with anti-slip lines.

[0016] The anti-slip texture can increase the friction between the fixing mechanism and the limiting mechanism, ensuring that the fixing mechanism will not undergo unnecessary displacement or detachment.

[0017] Optionally, the limiting mechanism further includes a diameter-changing portion and a drawing section. The roller-attaching section and the drawing section are connected through the diameter-changing portion, and the diameter of the drawing section is greater than that of the roller-attaching section.

[0018] The diameter-changing portion and the drawing section are used to vacate the space for the drawing groove, for accommodating and limiting the tab drawing ring.

[0019] Optionally, the inner side of the limiting mechanism is provided with an anti-slip texture.

[0020] It increases the friction between the swing roller, the tab drawing ring and the inner wall of the limiting mechanism, prevents slipping or detachment, and improves the stability during the drawing process, ensuring that the tabs of the electrode can be stably drawn.

[0021] Optionally, the outer side of the limiting mechanism is provided with an anti-slip texture.

[0022] It increases the friction between the fixing mechanism and the limiting mechanism, ensuring that the fixing mechanism will not undergo unnecessary displacement or detachment.

[0023] Advantageous Effects

[0024] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following advantageous effects:

[0025] The technical solution provided by the present utility model consists of multiple thin sheet rings to form the tab drawing ring. The thin sheet rings are detachable and the number of layers can be adjusted according to actual needs. The thicknesses of different numbers of layers are different, which can be used for different thicknesses of electrode materials to be drawn. And the tab drawing ring can be detached and the position can be adjusted, which can be used for different coating widths of electrode materials to be drawn. The coating width of the tab refers to the width of the active material coated on the tab. It can be easily installed on the existing swing roller without major modification to the production line. And the number of layers and thickness of the tab drawing ring can be adjusted according to actual requirements, and it can adapt to different types of electrodes and different drawing requirements. Description of the Drawings

[0026] Figure 1 It is a schematic structural view of an adjustable tab drawing device proposed by an embodiment of the present utility model;

[0027] Figure 2 It is a front view of an adjustable tab drawing device proposed by an embodiment of the present utility model;

[0028] Figure 3 It is a schematic structural view of the tab drawing ring of an adjustable tab drawing device proposed by an embodiment of the present utility model;

[0029] Figure 4 Schematic diagram of the structure of the limiting mechanism of an adjustable tab drawing device proposed for an embodiment of the present utility model;

[0030] 1. Tab drawing ring; 101. Multilayer structure; 2. Limiting mechanism; 201. Roller-attaching section; 202. Reducing diameter section; 203. Drawing section; 204. Drawing groove; 3. Fixing mechanism; 4. Swing roller; 5. Electrode sheet material; 501. Electrode tab of the electrode sheet. Detailed implementation manners

[0031] To further understand the content of the present utility model, the present utility model will be described in detail with reference to the accompanying drawings and embodiments.

[0032] Embodiment

[0033] Combined with the attached Figure 1 , 2 , an adjustable tab drawing device includes a tab drawing ring 1, a limiting mechanism 2 and a fixing mechanism 3. This device is installed on the swing roller 4 for adjusting the tension of the electrode sheet behind the main roller of the rolling mill. If there are multiple swing rollers 4, it can be installed on one or more swing rollers 4.

[0034] The fixing mechanism 3 is tightly wrapped around the outside of the limiting mechanism 2. The number of fixing devices can be 2 to 4, and the diameters and arcs of its overall platform and boss need to match the swing roller 4 and the drawing ring to ensure close fitting. Anti-slip patterns can be provided on the inner wall of the fixing device to prevent slipping.

[0035] The fixing mechanism 3 is made of elastic, high-temperature resistant and corrosion-resistant materials such as rubber. In addition, elastic tapes, ordinary tapes or straps can also be used to further fix the device.

[0036] Anti-slip patterns are provided on the inner wall of the fixing mechanism 3. Anti-slip patterns are provided on the inner side of the limiting mechanism 2. Anti-slip patterns are provided on the outer side of the limiting mechanism 2. The above anti-slip pattern settings can be combined arbitrarily.

[0037] Combined with the attached Figure 3 , the tab drawing ring 1 includes a detachable multilayer structure 101 composed of multiple thin sheet rings. The tab drawing ring 1 is wrapped around the swing roller 4. The diameters of the multiple thin sheet rings are different but can be tightly nested layer by layer, and are adaptively adjusted according to the coating width and thickness of the electrode tab 501 of the electrode sheet. The coating width of the electrode tab refers to the width of the active material coated on the electrode tab. The thickness of the thin sheet ring of the tab drawing ring 1 is between 0.05 and 0.6 millimeters, and the thickness of the thin sheet ring of the tab drawing ring 1 can be 0.05 mm, 0.1 mm or 0.6 mm.

[0038] Combined with the attached Figure 4, the limiting mechanism 2 includes a roller - attaching section 201 and a drawing groove 204. The limiting mechanism 2 wraps around the tab drawing ring 1 and the swing roller 4 in sections. The roller - attaching section 201 is closely attached to the swing roller 4. The drawing groove 204 is located inside the limiting mechanism 2 and is adapted to the tab drawing ring 1. The side wall of the drawing groove 204 is in limiting contact with the side surface of the tab drawing ring 1. The limiting mechanism 2 further includes a diameter - changing section 202 and a drawing section 203. The roller - attaching section 201 and the drawing section 203 are connected by the diameter - changing section 202. The diameter of the drawing section 203 is larger than that of the roller - attaching section 201. The diameter - changing section 202 changes the diameter by means of steps on the inner and outer sides. The inner step is the side wall of the drawing groove 204, which is used to limit the tab drawing ring 1 in the axial direction of the swing roller 4. The limiting mechanism 2 is formed by semicircular splicing.

[0039] Installation method:

[0040] First, understand the rolling thickness of the actual electrode sheet and confirm the number of layers of the tab drawing ring 1 required. Install a fixing device on the outer side of the drawing ring and pre - tighten the strap (fixing device). After the electrode sheet passes through the drawing ring, determine the final position of the drawing ring and further tighten the strap (fixing device) to ensure the stability of the device during the production process.

[0041] Usage method:

[0042] Pass the electrode sheet to be stretched through the swing roller 4 equipped with the detachable tab drawing device. Adjust the tension on the swing roller 4 so that the electrode sheet is stretched under the action of the drawing ring. Adjust the number of layers and tension of the drawing ring according to the stretching effect.

[0043] Adjustment strategy:

[0044] If the tab stretching effect is not obvious, increase the number of layers and tension of the drawing ring. If the tab is stretched excessively, reduce the number of layers and tension of the drawing ring. If the tab stretching effect is moderate, keep the number of layers and tension of the drawing ring unchanged. If the electrode sheet deviates during the drawing process, stop the machine to adjust the position of the drawing ring.

[0045] The above schematically describes the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the creation of the present invention, design similar structural manners and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. An adjustable tab drawing device, characterized in that: include The lug drawing ring comprises a detachable multi-layer structure composed of multiple layers of thin-sheet circular rings, and the lug drawing ring is wrapped around an oscillating roller; A limiting mechanism, comprising a roller-adhering segment and a drawing groove, wherein the limiting mechanism is wrapped around the pole lug drawing ring and the swing roller in blocks, the roller-adhering segment is closely attached to the swing roller, the drawing groove is located on the inner side of the limiting mechanism and is adapted to the pole lug drawing ring, and the side wall of the drawing groove is in limited contact with the side surface of the pole lug drawing ring; The fixing mechanism is tightly wrapped around the limiting mechanism.

2. The adjustable tab drawing device according to claim 1, characterized in that: The limiting mechanism is formed by splicing in a semicircular shape.

3. The adjustable tab drawing device according to claim 1, characterized in that: The thickness of the thin sheet ring of the tab drawing ring is between 0.05 and 0.6 mm.

4. The adjustable tab drawing device according to claim 1, characterized in that: The fixing mechanism is made of elastic, high temperature resistant and corrosion resistant material.

5. An adjustable tab drawing device according to claim 1 or 4, characterized in that: The inner wall of the fixing mechanism is provided with anti-slip patterns.

6. The adjustable tab drawing device according to claim 1, characterized in that: The limiting mechanism further comprises a diameter-changing portion and a drawing section, the roller-attaching section and the drawing section are connected via the diameter-changing portion, and the diameter of the drawing section is greater than the diameter of the roller-attaching section.

7. The adjustable tab drawing device according to claim 1, characterized in that: The inner side of the limiting mechanism is provided with anti-slip patterns.

8. An adjustable tab drawing device according to claim 1 or 7, characterized in that: The outer side of the limiting mechanism is provided with anti-skid patterns.

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