A continuous slitting device for lithium battery copper foil processing

Abstract

The application discloses a kind of continuous slitting devices of lithium electric copper foil processing, including rack, the rack is rotatably provided with feed roller, guide roller, a pair of slitting roller and winding roller, each described slitting roller is provided with cutter. The cutter includes multiple knife holders, multiple cutter heads and snap rings, the snap ring is multiple arc-shaped plates, multiple described plates can be set on slitting roller around an integral circular sleeve. The sleeve is connected with sleeve through swivel joint on the winding roller, the movable plate is movably arranged on the circumference of the sleeve, and the outer wall of the winding roller is provided with a pawl. The present application relates to the technical field of lithium electric copper foil processing, which not only significantly improves the precision and stability of lithium electric copper foil slitting, simplifies the cutter adjustment operation, but also realizes automatic clamping and convenient release during winding process, and optimizes the efficiency, quality and operation experience of copper foil processing, providing strong technical support for high-quality and automated production of lithium electric copper foil.

Description

Technical Field

[0001] This invention relates to the field of lithium battery copper foil processing and preparation technology, specifically to a continuous slitting device for lithium battery copper foil processing. Background Technology

[0002] With the increasing global demand for clean energy, lithium-ion batteries, as key energy storage devices, have seen rapid development in performance and application scope. One of the core materials of lithium-ion batteries is lithium-ion copper foil, which serves as the negative electrode current collector. Its quality and processing precision directly affect the battery's energy density, cycle life, safety, and cost. Copper foil is typically supplied in wide rolls. Before being used in battery manufacturing, it needs to be precisely slit into narrow strips of a specified width according to different battery design requirements. Therefore, lithium-ion copper foil slitting is an indispensable and crucial upstream process in battery manufacturing.

[0003] Currently, most lithium-ion battery copper foil slitting equipment widely used in the industry operates intermittently or semi-continuously, and there are still many challenges in terms of slitting accuracy, efficiency, and winding quality. During long-term continuous operation, traditional slitting devices are prone to slight axial displacement of the cutter on the slitting rollers due to factors such as copper foil tension fluctuations, vibrations generated during cutting, and thermal deformation or wear of the equipment itself. Although this displacement seems small, it is enough to cause burrs, serrations, or deviations in the width of the cutting line, seriously affecting the yield of the copper foil.

[0004] In the winding process, existing winding methods cannot automatically adjust tension according to changes in the copper foil roll diameter, resulting in loose or insufficient winding, or internal tightness followed by external looseness, forming "bulges" or "collapses," which affect subsequent processing. More importantly, when removing the cut copper foil roll from the winding roller, operators usually need to do it manually or use auxiliary tools to fix the roll, which not only increases labor intensity and reduces production efficiency, but also easily damages the end face of the copper foil roll during frequent loading and unloading, affecting its appearance and ease of use. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a continuous slitting device for lithium battery copper foil processing, which solves the problem of easy displacement of existing blades during cutting operations.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a continuous slitting device for lithium battery copper foil processing, comprising a frame, on which a feeding roller, a guide roller, a pair of slitting rollers, and a winding roller are rotatably mounted. Each slitting roller is provided with a cutter, which includes: multiple cutter holders, multiple cutter discs, a gap cavity, and a retaining ring. The multiple cutter holders are equidistantly mounted on the slitting rollers. The multiple cutter discs are fixed one-to-one on the cutter holders. The gap cavity is formed on the inner side of the cutter holder. The retaining ring is disposed in the gap cavity, and the retaining ring is composed of multiple arc-shaped plates that can be arranged in a complete circle around the slitting rollers. Each plate has side positioning teeth on its inner wall. A plurality of adjusting bolts are circumferentially arranged through the cutter holders. When the adjusting bolts are screwed in, they press down on the retaining ring, causing the side positioning teeth to abut against the slitting rollers.

[0007] Preferably, each of the retaining rings has a strip-shaped groove in the middle, a linkage is provided in the strip-shaped groove, the adjusting bolt is rotatably connected to the linkage, and a center positioning tooth is provided at the bottom of the linkage.

[0008] Preferably, the linkage component includes: a fixed seat, a connecting seat, and a connecting beam; the fixed seat abuts against the retaining ring; the connecting seat is disposed on the fixed seat, and the adjusting bolt is rotatably connected to the connecting seat; the connecting beam is disposed below the fixed seat and passes through a strip-shaped slot, and the central positioning tooth is disposed below the connecting beam.

[0009] Preferably, the retaining ring includes: a spring piece, a center plate, a first side plate, and a second side plate; the center plate is fixed to the bottom center of the spring piece; the first side plate and the second side plate are disposed on the bottom sides of the spring piece; wherein, there are two side positioning teeth, which are respectively disposed on the first side plate and the second side plate.

[0010] Preferably, the spring includes a spring flat portion and spring inclined portions disposed on both sides of the spring flat portion; the center plate is disposed on the spring flat portion, and the first side plate and the second side plate are disposed on the two spring inclined portions.

[0011] Preferably, the tool holder includes a first collar and a second collar that interlock with each other, the second collar being fixed to the tool disc, and the first collar being detachably connected to the second collar by a fixing bolt.

[0012] Preferably, a sleeve is connected to the take-up roller via a rotating ring, and a movable plate is movably arranged circumferentially on the sleeve. The outer wall surface of the take-up roller is provided with teeth, which abut against the lower part of the movable plate.

[0013] Preferably, the bottom surface of the movable plate is provided with a first inclined surface, and the top surface of the prying tooth is provided with a second inclined surface.

[0014] Preferably, the movable plate is provided with an outer limiting ring at the top circumferential direction of the sleeve, and the movable plate is provided with an inner limiting ring at the bottom circumferential direction.

[0015] Preferably, the portion of the take-up roller located inside the sleeve is provided with a limiting block, and a notch is opened on one side of the top of the limiting block, so that the top of the limiting block forms a limiting part and a receiving part respectively.

[0016] The beneficial effects of the present invention are as follows: By using the continuous slitting device for processing lithium battery copper foil provided by the present invention, when fixing the blade holder, tightening the adjusting bolts and compressing the retaining ring deforms the blade holder, so that the center positioning teeth and the side positioning teeth firmly press against the surface of the slitting roller, effectively preventing the blade holder from moving axially under the action of cutting force, thereby ensuring the straightness of the cutting edge and the consistency of the line width, greatly reducing the generation of defects such as burrs and serrations, and significantly improving the cutting yield of copper foil.

[0017] Furthermore, during blade adjustment, the retaining ring is reset by unscrewing the adjusting bolt, disengaging the side positioning teeth from the slitting roller. This allows the blade holder and blade disc to move relatively freely on the slitting roller, making the adjustment of the blade's axial position (i.e., blade adjustment) exceptionally simple and quick, without the need for complex disassembly steps. After blade adjustment, simply retightening the adjusting bolt quickly locks the position. This design significantly reduces blade adjustment time and operational difficulty.

[0018] Secondly, during the winding operation, when the winding roller rotates in the reverse direction, the linkage drives the movable plate to move outward, causing it to abut against the inner wall of the winding drum, thus achieving automatic and reliable locking of the winding drum. This ensures that during the winding process, especially during high-speed winding or when encountering slight disturbances, the winding drum can be stably fixed on the winding roller, avoiding slippage or displacement, guaranteeing the neatness and tightness of the winding, and also eliminating the need for operators to manually fix the roll material, reducing labor intensity.

[0019] In summary, this solution not only significantly improves the precision and stability of lithium-ion battery copper foil slitting and simplifies blade adjustment operations, but also achieves automatic locking and convenient release during the winding process. It comprehensively optimizes the efficiency, quality, and user experience of copper foil processing, providing strong technical support for the high-quality and automated production of lithium-ion battery copper foil. Attached Figure Description

[0020] Figure 1 This is an isometric view of the frame of the present invention;

[0021] Figure 2 This is a cross-sectional view of the slitting roller of the present invention;

[0022] Figure 3 For the present invention Figure 2 Sectional view along line AA;

[0023] Figure 4 This is a schematic diagram of the retaining ring structure of the present invention;

[0024] Figure 5 This is a cross-sectional view of the retaining ring of the present invention;

[0025] Figure 6 This is a diagram showing the state of the retaining ring after it has been pressed down.

[0026] Figure 7 This is an isometric view of the winding roller of the present invention;

[0027] Figure 8 This is a cross-sectional view of the winding roller of the present invention;

[0028] Figure 9 For the present invention Figure 8 Enlarged structural diagram at point B;

[0029] Figure 10 This is a schematic diagram of the limiting block structure of the present invention.

[0030] Explanation of reference numerals in the diagram: 1. Frame; 2. Feeding roller; 3. Guide roller; 4. Slitting roller; 5. Rewinding roller; 6. Cutter head; 7. Cutter holder; 71. First collar; 72. Second collar; 73. Fixing bolt; 8. Adjusting bolt; 9. Snap ring; 91. Center plate; 92. First side plate; 93. Spring; 931. Spring flat part; 932. Spring inclined part; 94. Second side plate; 10. Gap cavity; 11. Strip slot; 12. Side positioning tooth; 13. Connecting seat; 14. Center positioning tooth; 15. Connecting beam; 16. Fixed seat; 17. Movable plate; 18. Sleeve; 19. Pulley tooth; 20. Outer limiting ring; 21. Inner limiting ring; 22. First inclined surface; 23. Second inclined surface; 24. Rotating ring; 25. Limiting block; 26. Notch; 27. Limiting part; 28. Receiving part. Detailed Implementation

[0031] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Various changes can be made to the implementation schemes as long as the effects of the present invention can be achieved.

[0033] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly described below.

[0034] like Figures 1-10 As shown in the embodiment of this application, a continuous slitting device for processing lithium-ion battery copper foil is proposed, including a frame 1. A feeding roller 2, a guide roller 3, a pair of slitting rollers 4, and a winding roller 5 are rotatably mounted on the frame 1 for guiding, cutting, and winding lithium-ion battery copper foil. Each slitting roller 4 is equipped with a cutter, and the cutters on the two slitting rollers 4 are correspondingly arranged to form a cutter group for cutting the continuously passing lithium-ion battery copper foil.

[0035] In this embodiment, as Figure 2 and Figure 3 As shown, the cutter includes multiple blade holders 7, multiple blade discs 6, and retaining rings 9. Specifically, the multiple blade holders 7 are equidistantly mounted on the slitting roller 4, and the multiple blade discs 6 are fixed one-to-one on the blade holders 7, together forming the blade body for cutting lithium battery copper foil.

[0036] Furthermore, to secure the blade holder 7, this embodiment includes a retaining ring 9 on the blade holder 7 to fix the blade holder 7 and the blade disc 6 onto the slitting roller 4, preventing displacement under cutting force. Specifically, a gap cavity 10 is formed inside the blade holder 7, and the retaining ring 9 is disposed within the gap cavity 10. For example, the retaining ring 9 is a plurality of arc-shaped plates, which can be arranged in a complete circle around the slitting roller 4, and each plate has side positioning teeth 12 on its inner wall.

[0037] Furthermore, several adjusting bolts 8 are circumferentially arranged on the blade holder 7. When the adjusting bolts 8 are screwed in, the retaining ring 9 is deformed, causing the side positioning teeth 12 to abut against the slitting roller 4, preventing the blade holder 7 from moving left and right on the slitting roller 4 when the blade disc 6 cuts lithium battery copper foil. Correspondingly, when the adjusting bolts 8 are screwed out, the retaining ring 9 resets, causing the side positioning teeth 12 to disengage from the slitting roller 4. At this time, the position of the cutter on the slitting roller 4 is adjusted for blade adjustment.

[0038] Furthermore, such as Figure 4 As shown, each retaining ring 9 has a strip-shaped slot 11 in the middle, and a linkage is provided in the strip-shaped slot 11. The adjusting bolt 8 is rotatably connected to the linkage, and a center positioning tooth 14 is provided at the bottom of the linkage. In order to improve the fixing effect of the cutter, a center positioning tooth 14 is added to the retaining ring 9 in this embodiment. When the adjusting bolt 8 is screwed in, the center positioning tooth 14 is driven to descend and abut against the slitting roller 4 through the linkage, which ensures the absolute stability of the position of the cutter holder 7 during high-speed cutting.

[0039] In some embodiments, such as Figure 5 and Figure 6As shown, the aforementioned linkage includes a fixed seat 16, a connecting seat 13, and a connecting beam 15. The fixed seat 16 abuts against the retaining ring 9; the connecting seat 13 is disposed on the fixed seat 16, and the adjusting bolt 8 is rotatably connected to the connecting seat 13; the connecting beam 15 is disposed below the fixed seat 16 and passes through the strip slot 11, and the center positioning tooth 14 is disposed below the connecting beam 15.

[0040] During implementation, when the adjusting bolt 8 is screwed in, it presses down the retaining ring 9 to deform, so that the center positioning tooth 14 and the side positioning tooth 12 both abut against the slitting roller 4, so that the cutter holder 7 will not move left and right on the slitting roller 4 when the cutter disc 6 cuts the lithium battery copper foil.

[0041] To enable repeated deformation of the retaining ring 9, the retaining ring 9 in this embodiment includes a spring piece 93, a center plate 91, a first side plate 92, and a second side plate 94. Specifically, the center plate 91 is fixed to the bottom center of the spring piece 93; the first side plate 92 and the second side plate 94 are disposed on the bottom sides of the spring piece 93; wherein, there are two side positioning teeth 12, which are respectively disposed on the first side plate 92 and the second side plate 94. By setting the spring piece 93, the retaining ring 9 can be repeatedly deformed. In the normal state, the spring piece 93 is arc-shaped, and after being pressed down, it becomes flat.

[0042] Specifically, the spring 93 includes a spring flat portion 931 and spring inclined portions 932 disposed on both sides of the spring flat portion 931; for example, the center plate 91, the first side plate 92 and the second side plate 94 are all independent components, the center plate 91 is disposed on the spring flat portion 931, and the first side plate 92 and the second side plate 94 are disposed on the two spring inclined portions 932.

[0043] In this embodiment, as Figure 2 As shown, the blade holder 7 includes a first collar 71 and a second collar 72 that interlock with each other. The second collar 72 is fixed to the blade disc 6, and the first collar 71 is detachably connected to the second collar 72 by a fixing bolt 73. When adjusting the blade, slightly loosening the fixing bolt 73 causes the first collar 71 and the second collar 72 to separate slightly, creating a certain gap between them. At this time, the gap in the gap cavity 10 increases. After the adjusting bolt 8 is unscrewed and loosened, each retaining ring 9 deforms, causing the center positioning tooth 14 and the side positioning tooth 12 to disengage from the slitting roller 4.

[0044] In this embodiment, as Figure 7 and Figure 8 As shown, a sleeve 18 is connected to the take-up roller 5 via a rotating ring 24. A movable plate 17 is movably arranged around the sleeve 18. A tooth 19 is provided on the outer wall of the take-up roller 5, and the tooth 19 abuts against the lower part of the movable plate 17.

[0045] When the take-up roller 5 rotates in the reverse direction, under the action of rotational force, the take-up roller 5 drives the tooth 19 to move to the bottom of the movable plate 17, pushing the movable plate 17 to move outward and abut against the inner wall of the take-up drum of the lithium battery copper foil, so that the take-up roller 5 automatically locks the take-up drum of the lithium battery copper foil after rotation.

[0046] Furthermore, such as Figure 8 and Figure 9 As shown, the bottom surface of the movable plate 17 is provided with a first inclined surface 22, and the top surface of the pawl 19 is provided with a second inclined surface 23. When the winding drum of the lithium battery copper foil is removed after winding is completed, the winding drum of the lithium battery copper foil can be turned forward by using a wrench. Under the action of the first inclined surface 22 and the second inclined surface 23, the pawl 19 disengages from the movable plate 17, causing the movable plate 17 to retract and release the locking of the winding drum of the lithium battery copper foil.

[0047] In addition, an outer limiting ring 20 is provided on the top circumference of the movable plate 17 located on the sleeve 18, and an inner limiting ring 21 is provided on the bottom circumference of the movable plate 17 to limit the travel of the movable plate 17 when it moves up and down.

[0048] Furthermore, such as Figure 10 As shown, the portion of the take-up roller 5 located inside the sleeve 18 is provided with a limiting block 25. A notch 26 is opened on one side of the top of the limiting block 25, so that the top of the limiting block 25 forms a limiting part 27 and a receiving part 28 respectively.

[0049] For example, during the process of the moving tooth 19 pushing the movable plate 17 outward from below, the movable plate 17 rises along the wall of the limiting part 27, and sits on the receiving part 28 when the movable plate 17 descends. At the same time, when the moving tooth 19 moves to below the movable plate 17, the limiting block 25 cooperates with the inner limiting ring 21 to limit the movable plate 17.

[0050] The working principle is as follows:

[0051] Wide lithium battery copper foil rolls are released by the unloading roller 2, guided by the guide roller 3 to a pair of slitting rollers 4, and slit into narrow strips of a specified width by the cutter disc 6 on the slitting roller 4. The slit copper foil is finally wound into a roll by the winding roller 5 to complete continuous processing.

[0052] The cutter consists of a cutter disc 6, a cutter holder 7, a retaining ring 9, and an adjusting bolt 8. Multiple cutter holders 7 are equidistantly mounted on the slitting roller 4, and the cutter discs 6 are fixed one-to-one on the cutter holders 7 to form multiple cutting units.

[0053] When fixing, tighten the adjusting bolts 8 around the blade holder 7. The adjusting bolts 8 press down the retaining ring 9 so that the side positioning teeth 12 of the retaining ring 9 are located on both sides and the center positioning teeth 14 of the linkage synchronously contact the surface of the slitting roller 4. Through the three-point clamping force of the center and both sides, the blade holder 7 is firmly fixed on the slitting roller 4, avoiding axial displacement of the blade holder 7 due to vibration or cutting force during the slitting process, and ensuring the straightness and width consistency of the cutting edge.

[0054] When adjusting the blade, unscrew the adjusting bolt 8, and the retaining ring 9 will reset under its own elasticity. The side positioning teeth 12 and the center positioning teeth 14 will disengage from the surface of the slitting roller 4, and there will be no fixed constraint between the blade holder 7 and the slitting roller 4.

[0055] At this time, the blade holder 7 can slide freely on the slitting roller 4 (the blade holder 7 is composed of a detachable first ring 71 and a second ring 72). Slightly loosening the fixing bolt 73 can increase the movement clearance. After adjusting to the target width position, tightening the adjusting bolt 8 can complete the fixation. No complicated disassembly is required, simplifying the operation process.

[0056] During winding, the winding roller 5 rotates in the opposite direction, and the tooth 19 rotates with it. The second inclined surface 23 on the top surface of the tooth 19 contacts the first inclined surface 22 on the bottom surface of the movable plate 17, pushing the movable plate 17 to move radially outward along the sleeve 18 until the movable plate 17 touches the inner wall of the winding drum, thereby realizing the automatic locking of the winding drum and ensuring that the winding drum does not slip or deviate during the winding process, and the winding is tight and neat.

[0057] After winding is completed, the forward rotating winding roller 5 rotates with it, and the tooth 19 disengages from the movable plate 17 through the inclined plane. The movable plate 17 retracts radially under its own gravity or restoring force, releasing the locking of the winding drum.

[0058] The range of motion of the movable plate 17 is limited by the top of the outer limiting ring 20 and the bottom of the inner limiting ring 21. The limiting block 25 (including the limiting part 27 and the receiving part 28) inside the winding roller 5 further constrains its position, ensuring operational stability and facilitating the quick removal of the wound copper foil roll.

[0059] The basic principles, main features, and advantages of the present invention have been described above. However, the above description is only a specific embodiment of the present invention, and the technical features of the present invention are not limited thereto. Any other embodiments derived by those skilled in the art without departing from the technical solution of the present invention should be covered within the patent scope of the present invention.

[0060] In the description of this invention, each embodiment focuses on its differences from other embodiments, and similar or identical parts between embodiments can be referred to interchangeably. As the apparatus disclosed in the embodiments corresponds to the methods disclosed in the embodiments, the description is relatively simple, and relevant parts can be referred to the method section.

[0061] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous slitting device for processing lithium battery copper foil, comprising a frame (1), wherein a feeding roller (2), a guide roller (3), a pair of slitting rollers (4), and a winding roller (5) are rotatably arranged on the frame (1), and each of the slitting rollers (4) is provided with a cutter, characterized in that, The cutter includes: Multiple blade holders (7) are equidistantly mounted on the slitting roller (4); Multiple cutter heads (6) are fixed on the cutter holder (7) one by one; A gap cavity (10) is formed inside the tool holder (7); A retaining ring (9) is provided in the gap cavity (10). The retaining ring (9) is a plurality of arc-shaped plates. The plurality of plates can be arranged in a complete circle and sleeved on the slitting roller (4). Each plate has a side positioning tooth (12) on its inner wall. The tool holder (7) is provided with several adjusting bolts (8) circumferentially. When the adjusting bolts (8) are screwed in, they press down on the retaining ring (9) to deform and cause the side positioning teeth (12) to abut against the slitting roller (4). Each of the retaining rings (9) has a strip-shaped slot (11) in the middle, and a linkage is provided in the strip-shaped slot (11). The adjusting bolt (8) is rotatably connected to the linkage, and a center positioning tooth (14) is provided at the bottom of the linkage. The retaining ring (9) includes: Shrapnel (93); The center plate (91) is fixed to the center bottom of the spring piece (93); The first side plate (92) and the second side plate (94) are disposed at the bottom of both sides of the spring piece (93); Among them, there are two side positioning teeth (12), which are respectively set on the first side plate (92) and the second side plate (94); A sleeve (18) is connected to the take-up roller (5) via a rotating ring (24). A movable plate (17) is movably arranged around the sleeve (18). A tooth (19) is provided on the outer wall of the take-up roller (5). The tooth (19) abuts against the lower part of the movable plate (17). The bottom surface of the active plate (17) is provided with a first inclined surface (22), and the top surface of the prying tooth (19) is provided with a second inclined surface (23).

2. The continuous slitting device for processing lithium battery copper foil according to claim 1, characterized in that: The linkage component includes: The fixing seat (16) abuts against the retaining ring (9); A connecting seat (13) is provided on the fixed seat (16), and the adjusting bolt (8) is rotatably connected to the connecting seat (13); The connecting beam (15) is located below the fixed seat (16) and passes through the strip slot (11), and the central positioning tooth (14) is located below the connecting beam (15).

3. The continuous slitting device for processing lithium battery copper foil according to claim 1, characterized in that: The spring (93) includes a spring flat portion (931) and spring inclined portions (932) disposed on both sides of the spring flat portion (931); the center plate (91) is disposed on the spring flat portion (931), and the first side plate (92) and the second side plate (94) are disposed on the two spring inclined portions (932).

4. The continuous slitting device for processing lithium battery copper foil according to claim 1, characterized in that: The tool holder (7) includes a first collar (71) and a second collar (72) that are interlocked. The second collar (72) is fixed to the tool disc (6). The first collar (71) is detachably connected to the second collar (72) by a fixing bolt (73).

5. The continuous slitting device for processing lithium battery copper foil according to claim 1, characterized in that: The movable plate (17) is provided with an outer limiting ring (20) on the top circumferential direction of the sleeve (18), and an inner limiting ring (21) is provided on the bottom circumferential direction of the movable plate (17).

6. The continuous slitting device for processing lithium battery copper foil according to claim 5, characterized in that: The portion of the take-up roller (5) located inside the sleeve (18) is provided with a limiting block (25). A notch (26) is opened on one side of the top of the limiting block (25), so that the top of the limiting block (25) forms a limiting part (27) and a receiving part (28).

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