Tab die cutting mechanism and lithium battery processing production equipment

Abstract

The utility model relates to a tab die cutting mechanism and a lithium battery processing production device. The lithium battery processing production device comprises the tab die cutting mechanism. According to the tab die cutting mechanism, flattening rollers are arranged on the two opposite sides of a material respectively, an expansion section is arranged on each flattening roller, and then the expansion sections abut against the edge of the material, so that the two sides of the edge of the material can be abut against the expansion sections respectively, and the edge of the edge of the material always keeps certain tension; the warping deformation and the like of the edge of the material due to the release of internal stress in the cutting process are prevented, and the formation of a wavy edge is prevented. In this way, it can be guaranteed that the cutting device can cut the correct position on the material all the time, and the cutting yield is guaranteed; and the conveying stability of the materials after edge cutting can be guaranteed, the materials are prevented from being wound and even broken, and the qualified rate of final finished products of the materials is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of electrode die-cutting, and in particular to electrode die-cutting mechanism and lithium battery processing and production equipment. Background Technology

[0002] Currently, to meet market demands for longer driving range and higher energy density, battery manufacturers are constantly exploring methods to improve the volumetric and gravimetric energy density of battery cells. Among these methods, the electrode, as one of the core components of lithium-ion batteries, directly affects the overall performance of the battery.

[0003] In the manufacturing process, to improve the energy density of the electrode, the coating surface density and material compaction density are typically increased. However, this approach also presents new challenges. During the electrode rolling process, the coating area is compressed, generating internal stress. To address this, materials such as Teflon are typically bonded to the surface of the pinch roller to reduce stress accumulation, and the foil area undergoes stretching treatment to prevent breakage due to wrinkling. However, this stretching treatment can cause wavy edges on the foil area during cutting. Specifically, the foil area releases stress upon cutting, resulting in wavy edges.

[0004] The wavy edge phenomenon not only affects the appearance quality of the electrode sheets, but more importantly, it causes the electrode foil area to vibrate back and forth during the subsequent laser die-cutting process. This causes the laser focus to change with the foil's movement, resulting in energy fluctuations at the cutting point. Consequently, the attached portion of the foil area cannot be completely cut off, and waste edges easily get stuck on the rollers, causing tearing and breaking of the tape, severely impacting production efficiency and product yield. Furthermore, the wavy edge can also cause positioning deviations in the electrode sheets during subsequent assembly, further affecting the battery's assembly accuracy and overall performance. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a tab die-cutting mechanism and lithium battery processing and production equipment.

[0006] The first aspect of this utility model provides a tab die-cutting mechanism for cutting materials. The tab die-cutting mechanism includes:

[0007] A flattening device includes at least two flattening rollers, each roller comprising an interconnected smooth section and an expanding section. The radius of the expanding section gradually increases from the end connected to the smooth section away from it. Part of the flattening rollers movably abuts against one side of the material, while the remaining rollers movably abut against the other side of the material. The edge of the material abuts against the expanding section.

[0008] A cutting device facing the material between the flattening rollers, the cutting device being used to cut the edges of the material.

[0009] Preferably, each of the flattening rollers includes two expansion sections, which are symmetrically arranged on both sides of the flattening section, and the two expansion sections on each of the flattening rollers respectively abut against the two opposite edges of the material.

[0010] Preferably, the expansion section includes a small-diameter end and a large-diameter end, the small-diameter end is connected to the smooth section, the radius of the small-diameter end is R1, the radius of the large-diameter end is R2, and the difference between R2 and R1 corresponds to the extension length of the material.

[0011] Preferably, R2-R1 = 1.25mm to 12.5mm.

[0012] Preferably, in the length extension direction of the gentle section, the distance between the small diameter end and the large diameter end on each of the expansion sections is 22mm to 55mm.

[0013] Preferably, the material has blank areas on both edges, and a coating area is provided between the two blank areas. The coating area is movably supported by the flat section, and the two expansion sections on each flattening roller are movably supported by the two blank areas respectively.

[0014] Preferably, the flattening device includes three or more flattening rollers, each flattening roller is arranged along the conveying trajectory of the material, and each flattening roller is arranged alternately on both sides of the material.

[0015] Preferably, the electrode die-cutting mechanism further includes at least one rotatable guide roller, each of which is movably supported against the material.

[0016] Preferably, the cutting device includes a mounting frame and at least one laser, each laser being disposed on the mounting frame and facing the material between the flattening rollers, the laser being used to cut tabs on the edge of the material.

[0017] The second aspect of this utility model provides a lithium battery processing and production equipment, which includes a frame and a tab die-cutting mechanism as described in any of the above technical solutions. The cutting device is disposed on the frame, and each of the flattening rollers is rotatably disposed on the frame.

[0018] The following are the beneficial effects of implementing this utility model:

[0019] This utility model relates to a tab die-cutting mechanism and a lithium battery processing production equipment. The lithium battery processing production equipment includes a tab die-cutting mechanism. In the tab die-cutting mechanism, flattening rollers are respectively arranged on opposite sides of the material, and an expansion section is provided on each flattening roller. The expansion section abuts against the edge of the material, ensuring that both sides of the material's edge are held abutted by the expansion section. This maintains a certain tension on the material's edge, preventing warping or deformation due to the release of internal stress during the cutting process, and preventing the formation of wavy edges.

[0020] In this way, not only can the cutting device always cut the correct position on the material, ensuring the cutting yield, but it can also ensure the smooth transmission of the material after edge cutting, preventing the material from tangling or even breaking, thus ensuring the qualification rate of the final product. In addition, it can also avoid the wavy edge affecting the positioning deviation of the material in subsequent processing and production, ensuring the assembly accuracy and overall performance of the final product. Attached Figure Description

[0021] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0022] Figure 1 This is a schematic diagram of the electrode die-cutting mechanism in some embodiments of this utility model;

[0023] Figure 2 From another perspective Figure 1 The diagram shows the structure of the electrode die-cutting mechanism.

[0024] Figure 3 yes Figure 1 The diagram shows a cross-sectional view of the electrode die-cutting mechanism. Detailed Implementation

[0025] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be more thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0026] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Figure 1 The diagram illustrates a tab die-cutting mechanism 10 in some embodiments of the present invention, used for cutting material 20. The material can be any material requiring cutting processing in the prior art, such as battery manufacturing materials.

[0030] like Figures 1 to 3 As shown, the tab die-cutting mechanism 10 includes a flattening device 1 and a cutting device 2. The flattening device 1 is disposed on the material conveying path. The flattening device 1 is used to flatten the edge 30 of the material 20, and the cutting device 2 is used to cut the edge 30 of the material 20.

[0031] like Figures 1 to 3As shown, the flattening device 1 includes at least two flattening rollers 11. Each flattening roller 11 includes a smooth section 111 and an expansion section 112 connected to each other. The radius of the expansion section 112 gradually increases from the end connected to the smooth section 111 toward the direction away from the smooth section 111. Part of the flattening roller 11 is movably held against one side of the material 20, and the remaining flattening roller 11 is movably held against the other side of the material 20. The edge 30 of the material 20 is held against the expansion section 112.

[0032] The cutting device 2 is oriented towards the material 20 between each flattening roller 11, and is used to cut the edge 30 of the material 20.

[0033] Understandably, the smooth section 111 is designed to provide a smooth transition area before the material 20 enters the flattening device 1, preventing sudden deformation or stress concentration of the material 20 when it enters the flattening roller 11. The radius of the smooth section 111 remains constant, allowing the material 20 to enter the flattening roller 11 smoothly and reducing unnecessary stress accumulation.

[0034] The radius of the expansion section 112 is configured to gradually increase away from the flattening section 111. That is, the expansion section 112 has two ends, one of which is connected to the flattening section 111, and the other end is relatively far from the expansion section 112. In the axial direction of the flattening roller 11, the radius of the flattening section 111 gradually increases from one end (the end connected to the flattening section 111) to the other end (the end far from the flattening section 111). This effectively adheres the edge 30 of the material 20 to the surface of the expansion section 112, maintaining a certain tension on the edge 30. When the material 20 passes through the expansion section 112, its edge 30 adheres tightly to the surface of the expansion section 112. Through this adhesion, the expansion section 112 can unfold the edge 30 of the material 20.

[0035] Thus, during the cutting process of the cutting device 2 cutting the edge 30 of the material 20, even if the edge 30 releases internal stress due to the cutting of some parts, the edge 30 will always maintain the predetermined orientation and continue to extend because it is always against the surface of the expansion section 112, thereby preventing the edge of the tab from lifting and forming a wavy edge.

[0036] like Figure 1 As shown, in some embodiments, the number of flattening rollers 11 can be configured as two, with one flattening roller 11 located on the upper side of the material 20 and the other flattening roller 11 located on the lower side of the material 20.

[0037] Understandably, setting the number of flattening rollers 11 to two can reduce the number of flattening rollers 11 as much as possible while ensuring the tension of the edge 30 of the material 20, thereby effectively reducing the cost of the equipment.

[0038] Furthermore, such as Figure 1 As shown, there is a gap between the two flattening rollers 11, that is, there is a gap between the position where one flattening roller 11 abuts on the material 20 and the position where the other flattening roller 11 abuts on the material 20. In other words, the two flattening rollers 11 will abut on different positions on the material 20 respectively.

[0039] Understandably, by placing the two flattening rollers in different positions, it can be ensured that both edges 30 of the material 20 are held abutted by the flattening rollers at different positions. This helps maintain the tension of the material edges and prevents wavy edges or warping deformation during the cutting process.

[0040] In other embodiments, the number of flattening rollers 11 may be configured to be three or more, and some of the flattening rollers 11 may be configured to movably abut against the upper side of the material 20, while other flattening rollers 11 may be configured to movably abut against the lower side of the material 20.

[0041] like Figures 1 to 3 As shown, in some embodiments of the tab die-cutting mechanism 10, each flattening roller 11 includes two expansion sections 112, which are symmetrically arranged on the flattening section 111. The two expansion sections 112 on each flattening roller 11 respectively abut against the two opposite edges 30 of the material 20.

[0042] Understandably, the smoothing section 111 is located in the middle part of the flattening roller 11, and its radius remains constant. The radius of the expanding section 112 gradually increases from the end connected to the smoothing section 111, forming a conical structure. Specifically, the radius of the large-diameter end 1122 is larger than the radius of the small-diameter end 1121.

[0043] It should be noted that the radius of the small diameter end 1121 is the same as the radius of the flat section 111, ensuring that the material 20 can smoothly transition from the flat section 111 to the expansion section 112.

[0044] Two expansion sections 112 are symmetrically arranged on both sides of the flattened section 111, respectively abutting against the two opposite edges 30 of the material 20. This symmetrical arrangement ensures that both edges 30 of the material 20 can be subjected to the same flattening treatment at the same time, maintaining the overall flatness of the material 20.

[0045] like Figures 1 to 3 As shown, in some embodiments of the tab die-cutting mechanism 10, the expansion section 112 includes a small diameter end 1121 and a large diameter end 1122. The small diameter end 1121 is connected to the smooth section 111. Let the radius of the small diameter end 1121 be R1, and let the radius of the large diameter end 1122 be R2. The difference between R2 and R1 corresponds to the extension length of the material 20.

[0046] Understandably, the elongation length of material 20 refers to the degree of stretching that material 20 undergoes during the preceding processing. The difference between R2 and R1 (R2-R1) is set based on the degree of stretching of material 20.

[0047] It should be noted that if the difference between R2 and R1 is configured to correspond to the degree of stretching of material 20 in the previous processing, after the edge 30 of material 20 is cut and the internal stress is released, the edge 30 will undergo corresponding deformation based on the degree of stretching in the previous processing step. By configuring the difference between R2 and R1 to correspond to this degree of deformation, it can be ensured that the stress-released edge 30 can always be in close contact with the surface of the expansion section 112.

[0048] Specifically, in some embodiments of the tab die-cutting mechanism 10, R2-R1 = 1.25mm to 12.5mm.

[0049] like Figures 1 to 3 As shown, in some embodiments of the tab die-cutting mechanism 10, the distance d between the small diameter end 1121 and the large diameter end 1122 on each expansion section 112 is 22mm to 55mm in the length extension direction of the flat section 111.

[0050] Understandably, in the length extension direction of the smooth section 111, the distance d between the small diameter end 1121 and the large diameter end 1122 on each expansion section 112 is 22mm to 55mm. This distance d refers to the length along the axial direction of the flattening roller 11 from the small diameter end 1121 to the large diameter end 1122.

[0051] like Figures 1 to 3 As shown, in some embodiments of the tab die-cutting mechanism 10, each of the two edges 30 of the material 20 is provided with a blank area 40, and a coating area 50 is provided between the two blank areas 40. The coating area 50 is movably supported by the flat section 111, and the two expansion sections 112 on each flattening roller 11 are movably supported by the two blank areas 40 respectively.

[0052] Understandably, the blank areas 40 are located on both sides of the material 20's edge 30. These areas are typically uncoated and are intended for subsequent processing (such as tab cutting). The presence of the blank areas 40 allows the material 20 to be flattened more effectively when passing through the flattening device 1, reducing wavy edges.

[0053] The coating area 50, located between the two blank areas 40, is the region where active materials or other functional materials have already been coated. The coating area 50 needs to be kept flat to ensure the consistency and stability of battery performance.

[0054] It should be noted that the coating area 50 first passes through the smooth section 111 of the flattening roller 11. The constant radius of the smooth section 111 ensures that the coating area 50 can pass through smoothly, avoiding deformation or stress concentration. At the same time, the two blank areas 40 of the material 20 respectively enter the expansion section 112 of the flattening roller 11. Since the small diameter end 1121 of the expansion section 112 is smoothly connected to the smooth section 111, the blank areas 40 can smoothly enter the expansion section 112.

[0055] like Figures 1 to 3 As shown, in some embodiments of the tab die-cutting mechanism 10, the flattening device 1 includes three or more flattening rollers 11, each flattening roller 11 is arranged along the conveying trajectory of the material 20, and each flattening roller 11 is arranged alternately on both sides of the material 20.

[0056] Understandably, increasing the number of flattening rollers 11 can further improve the flattening effect of the material 20 and ensure the flatness of the edge 30.

[0057] It should be noted that the staggered arrangement of the flattening rollers 11 allows each flattening roller 11 to press against the material from different directions, thereby allowing the edges of the material to be fully flattened.

[0058] like Figures 1 to 3 As shown, in some embodiments of the tab die-cutting mechanism 10, the tab die-cutting mechanism 10 further includes at least one rotatable guide roller 3, each guide roller 3 being movably supported against the material 20.

[0059] Understandably, the guide roller 3 is a rotatable cylindrical component with a smooth surface, capable of contacting the material 20 and providing necessary support and guidance. The number of guide rollers 3 can be configured according to actual needs, and they are usually set on the conveying path of the material 20 to ensure that the material 20 remains stable and flat during conveying.

[0060] like Figures 1 to 3 As shown, in some embodiments of the tab die-cutting mechanism 10, the cutting device 2 includes a mounting frame 21 and at least one laser 22, each laser 22 being disposed on the mounting frame 21, the laser 22 being directed toward the material 20 between each flattening roller 11, and the laser 22 being used to cut tabs at the edge 30 of the material 20.

[0061] Understandably, the mounting bracket 21 is a structure that supports and secures the laser 22. The laser 22 is the core component of the cutting device 2, used to emit a high-energy laser beam to precisely cut the material 20. Each laser 22 is mounted on the mounting bracket 21, and its position and angle can be adjusted to adapt to different cutting needs.

[0062] Depending on the actual needs, the cutting device 2 can be equipped with one or more lasers 22. For example, if it is necessary to cut multiple tabs simultaneously or to improve cutting efficiency, multiple lasers 22 can be configured.

[0063] The laser 22 is directed toward the material 20 between the flattening rollers 11. This arrangement ensures that the laser 22 can be accurately aligned with the edge 30 of the flattened material 20, thereby achieving precise cutting.

[0064] The lithium battery processing and production equipment of this utility model includes a frame and a tab die-cutting mechanism 10. The cutting device 2 is set on the frame, and each flattening roller 11 is rotatably set on the frame.

[0065] Understandably, the frame is the basic support structure of the entire lithium battery processing and production equipment to ensure the stability and durability of the equipment.

[0066] The following are the beneficial effects of implementing this utility model:

[0067] This utility model relates to a tab die-cutting mechanism and a lithium battery processing production equipment. The lithium battery processing production equipment includes a tab die-cutting mechanism. In the tab die-cutting mechanism, flattening rollers are respectively arranged on opposite sides of the material, and an expansion section is provided on each flattening roller. The expansion section abuts against the edge of the material, ensuring that both sides of the material's edge are held abutted by the expansion section. This maintains a certain tension on the material's edge, preventing warping or deformation due to the release of internal stress during the cutting process, and preventing the formation of wavy edges.

[0068] In this way, not only can the cutting device always cut the correct position on the material, ensuring the cutting yield, but it can also ensure the smooth transmission of the material after edge cutting, preventing the material from tangling or even breaking, thus ensuring the qualification rate of the final product. In addition, it can also avoid the wavy edge affecting the positioning deviation of the material in subsequent processing and production, ensuring the assembly accuracy and overall performance of the final product.

[0069] The present invention has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to the present invention. Furthermore, it is understood that the steps in the method of the present invention embodiments can be adjusted, combined, and deleted according to actual needs, and the modules in the device of the present invention embodiments can be combined, divided, and deleted according to actual needs.

[0070] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A tab die-cutting mechanism for cutting materials, characterized in that, include: A flattening device includes at least two flattening rollers, each roller comprising an interconnected smooth section and an expanding section. The radius of the expanding section gradually increases from the end connected to the smooth section away from it. Part of the flattening rollers movably abuts against one side of the material, while the remaining rollers movably abut against the other side of the material. The edge of the material abuts against the expanding section. A cutting device facing the material between the flattening rollers, the cutting device being used to cut the edges of the material.

2. The electrode die-cutting mechanism according to claim 1, characterized in that, Each of the flattening rollers includes two expansion sections, which are symmetrically arranged on both sides of the flattening section. The two expansion sections on each flattening roller abut against the two opposite edges of the material.

3. The electrode die-cutting mechanism according to claim 1 or 2, characterized in that, The expansion section includes a small-diameter end and a large-diameter end. The small-diameter end connects to the gentle section. Let the radius of the small-diameter end be R1, and the radius of the large-diameter end be R2. The difference between R2 and R1 corresponds to the extension length of the material.

4. The electrode die-cutting mechanism according to claim 3, characterized in that, R2-R1 = 1.25mm~12.5mm.

5. The electrode die-cutting mechanism according to claim 3, characterized in that, In the length extension direction of the gentle section, the distance between the small diameter end and the large diameter end on each of the expansion sections is 22 mm to 55 mm.

6. The electrode die-cutting mechanism according to claim 2, characterized in that, The material has blank areas on both edges, and a coating area is provided between the two blank areas. The coating area is movably supported by the flat section, and the two expansion sections on each flattening roller are movably supported by the two blank areas respectively.

7. The electrode die-cutting mechanism according to claim 1, characterized in that, The flattening device includes three or more flattening rollers, each of which is arranged along the conveying trajectory of the material and is staggered on both sides of the material.

8. The electrode die-cutting mechanism according to claim 1, characterized in that, The electrode die-cutting mechanism further includes at least one rotatable guide roller, each of which is movably supported against the material.

9. The electrode die-cutting mechanism according to claim 1, characterized in that, The cutting device includes a mounting frame and at least one laser, each laser being disposed on the mounting frame and facing the material between the flattening rollers. The laser is used to cut tabs on the edge of the material.

10. A lithium battery processing and production equipment, characterized in that, The lithium battery processing and production equipment includes a frame and a tab die-cutting mechanism as described in any one of claims 1 to 9, wherein the cutting device is disposed on the frame and each of the flattening rollers is rotatably disposed on the frame.

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