Lithium-ion battery tab pressing roller and rib pressing device

Abstract

This utility model belongs to the field of lithium-ion battery technology, specifically relating to a tab pressing roller and rib pressing device for lithium-ion batteries. It includes a roller body with multiple rows of end-to-end reinforcing ribs evenly distributed on the outer circumferential surface of the roller body. These reinforcing ribs extend in a curved pattern, continuously and without interruption in their radial extension, with closed trajectories. They are symmetrically arranged along the axis of the roller body, and are staggered symmetrically connected along the centerline of the reinforcing rib trajectory height. The continuous curved and symmetrically distributed reinforcing rib design on the surface of the pressing roller can evenly distribute and reinforce the indentation in the electrode travel and width directions, greatly improving the strength of the tab in these two directions. This effectively reduces defects such as folding, breakage, and tearing of the tab due to stress concentration during die-cutting and winding, thus improving the quality of the tab.

Description

Technical Field

[0001] This utility model belongs to the field of lithium-ion battery technology, specifically relating to a tab pressure roller and pressure rib device for lithium-ion batteries. Background Technology

[0002] In the manufacturing process of lithium-ion batteries, the tabs are a crucial component. As the key part connecting the lithium-ion battery to the external circuit, the performance of the tabs directly affects the overall performance and safety of the battery.

[0003] Traditional lithium-ion battery tabs have certain limitations in structure and performance. On the one hand, it is difficult to achieve an ideal balance between the strength and flexibility of ordinary tabs. If the tab strength is insufficient, it is prone to deformation and breakage during battery assembly and use. This not only affects the normal conductivity of the battery but may also cause safety hazards such as short circuits, overheating, or even fires. On the other hand, if the strength of the tabs is excessively pursued, their flexibility may be sacrificed, leading to problems such as bending of the tabs inside the battery and stress concentration during installation, which is also detrimental to the long-term stable operation of the battery.

[0004] On the other hand, existing electrode rib forming processes and devices also have many shortcomings. Some rib forming devices have inadequate rib structure designs, with rib shapes that are monotonous and lack innovation, making it difficult to effectively improve the overall performance of the electrode. For example, traditional rib forming methods may simply involve creating straight or regular striped indentations on the electrode surface. Such indentations have limited effect on enhancing the strength and flexibility of the electrode, and cannot fully meet the high-performance requirements of modern lithium-ion batteries.

[0005] Meanwhile, some clamping devices lack flexible adjustment functions. In actual production, different types and specifications of lithium-ion batteries may have different requirements for clamping the tabs. For example, parameters such as the angle, depth, and spacing of the clamping ribs need to be adjusted according to the specific battery design. However, some existing clamping devices cannot easily and accurately adjust these parameters, resulting in poor production flexibility and adaptability, and increasing production costs and difficulty.

[0006] Furthermore, some crimping devices lack visibility and ease of operation. During the crimping process, operators find it difficult to observe the working status of the pressure rollers and the crimping effect of the electrode tabs in real time, and cannot promptly identify and resolve potential problems, such as uneven crimping, or indentations that are too deep or too shallow, thereby affecting product quality and production efficiency.

[0007] In summary, existing lithium-ion battery tabs and their crimping devices suffer from problems such as difficulty in balancing strength and flexibility, unreasonable crimping structure, insufficient adjustment function, and poor operational visibility. There is an urgent need for a new type of lithium-ion battery tab crimping device to solve these problems and improve the performance and production efficiency of lithium-ion battery tabs. Utility Model Content

[0008] The purpose of this utility model is to provide a tab pressure roller and a rib pressing device for lithium-ion batteries. By optimizing the curved reinforcing rib structure of the tab pressure roller and the design of the adjustable angle mounting base, the strength and deformation resistance of the tab during the die-cutting and winding process are improved, and defects such as folding and breakage are reduced, thereby improving the production quality and efficiency of lithium-ion batteries.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] This utility model provides a tab pressure roller for lithium-ion batteries, including a roller body. Multiple rows of reinforcing ribs are evenly distributed on the outer circumferential surface of the roller body. The reinforcing ribs extend in a curved manner and are continuous and uninterrupted in radial extension with closed trajectories. They are arranged symmetrically along the axis of the roller body and are staggered symmetrically connected to each other along the center line of the height direction of the reinforcing rib trajectory.

[0011] Preferably, the height of the reinforcing rib protruding from the main body of the roller is 0.5-1mm, the width of the boss of the reinforcing rib is 0.5-1mm, and the two sides of the boss have chamfers, and the curvature of the top surface of the boss is consistent with the curvature of the circumferential surface of the main body of the roller.

[0012] Preferably, the distance between two adjacent reinforcing rib tracks is 1-3mm, and the distance from the vertex of the reinforcing rib track to the end face of the roller body is 0.5-1.5mm.

[0013] This utility model also discloses a tab pressing device for lithium-ion batteries, including the aforementioned pressure roller, as well as a mounting base, a drive assembly, a guide rail, a slider, and a rotating bracket; the drive assembly is mounted on the slider, the slider is slidably connected to the guide rail, the piston rod of the drive assembly is connected to the rotating bracket, and the pressure roller is rotatably mounted on the rotating bracket via the mounting base.

[0014] Preferably, the mounting base includes a mounting base body and an angle adjustment mechanism. The angle adjustment mechanism includes a rotary lock and a rotary positioning seat for adjusting the angle between the pressure roller and the electrode in the horizontal direction. An outer frame is fixed to the outside of the rotating bracket. The rotary lock passes through the angle groove on the outer frame and locks in the threaded hole on the rotary positioning seat, thereby locking the adjusted angle.

[0015] Preferably, the outer frame is provided with an angle mark, and the angle adjustment mechanism allows the pressure roller to adjust its angle within the range of -6° to +6°, and the angle adjustment directions on both sides are centrally symmetrical.

[0016] Preferably, the outer frame includes a metal frame and a transparent display area, which is used to observe the operating status of the pressure roller.

[0017] Preferably, the mounting base is connected to the rotating bracket via a rotating fixed shaft, and the relative angle between the rotating bracket and the mounting base is fixed by a locking knob.

[0018] Preferably, the reinforcing ribs of the pressure roller have a trajectory shape that is one of arc, U, ellipse or circle, and at least two reinforcing ribs are symmetrically distributed along the axial direction of the roller body.

[0019] Preferably, the drive component is a cylinder.

[0020] The beneficial effects of this utility model are:

[0021] 1. Regarding the reinforcement effect on the tabs, the design of continuous curved and symmetrically distributed reinforcing ribs on the surface of the pressure roller can evenly distribute and strengthen the indentation in both the electrode sheet travel and width directions, greatly improving the strength of the tabs in these two directions. This effectively reduces defects such as folding, breakage, and tearing caused by stress concentration during die-cutting and winding, thus improving the quality of the tabs. The height, width, and spacing of the reinforcing ribs are set reasonably, ensuring that the reinforcement enhances the strength of the tabs without excessively damaging the tab structure.

[0022] 2. In terms of the device's adjustment performance, the angle adjustment mechanism on the mounting base, together with the angle groove on the outer frame, can flexibly adjust the angle of the pressure roller relative to the horizontal direction of the electrode sheet. The adjustment range is -6° to +6°. It can adjust the angle of the pressure ribs in a targeted manner according to the electrode sheet of different models and process requirements, so as to apply different pressures to different height areas of the electrode tab, optimize the stress distribution of the electrode tab, and enhance the adaptability and flexibility of the device.

[0023] 3. Regarding ease of use and maintainability, the transparent display area of ​​the outer frame allows operators to observe the operating status of the pressure roller in real time, enabling timely detection and troubleshooting. The pressure roller is mounted on the mounting base via a pressure roller shaft and bearings, facilitating installation and disassembly, and aiding in equipment maintenance and component replacement. Furthermore, the rounded or right-angled design of the fixed shafts at both ends of the roller body and the edges prevents the electrode sheets from being scratched during operation, ensuring electrode sheet quality and production continuity. Attached Figure Description

[0024] Figure 1 This is a perspective view of the electrode ear pressure roller in this utility model;

[0025] Figure 2This is a front view of the electrode ear pressure roller in this utility model;

[0026] Figure 3 This is a top view of the electrode ear pressure roller in this utility model;

[0027] Figure 4 This is a perspective view of the electrode ear pressing device of this utility model;

[0028] Figure 5 This is a partial enlarged view of the electrode ear pressing device of this utility model;

[0029] Figure 6 This is a front view of the electrode ear pressing device of this utility model;

[0030] Figure 7 This is a perspective view of the electrode ear pressing device of this utility model;

[0031] The attached diagram is described below:

[0032] 1. Guide rail; 2. Slider; 3. Drive assembly; 4. Rotary bracket; 41. Rotary base; 42. Rotary connector; 43. Rotary fixed shaft; 5. Pressure roller; 51. Roller body; 52. Fixed shaft; 53. Mounting hole; 54. Center through hole; 55. Reinforcing rib; 6. Mounting base; 61. Mounting base body; 62. Angle adjustment mechanism; 621. Rotary lock; 622. Rotary positioning seat; 7. Outer frame; 71. Metal frame; 72. Transparent display area; 73. Angle groove. Detailed Implementation

[0033] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0034] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixed connection," and "fixed connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings and preferred embodiments.

[0037] like Figure 1-3 As shown, this utility model discloses a pressure roller for lithium-ion batteries, including a roller body 51. Multiple rows of reinforcing ribs 55 are evenly distributed on the outer circumferential surface of the roller body 51, with each row connected end-to-end. The reinforcing ribs 55 extend in a curved pattern, continuously extending radially without interruption and with a closed trajectory. They are symmetrically arranged along the axis of the roller body 51, and are staggered symmetrically connected along the center line of the height direction of the reinforcing rib trajectory. The staggered symmetrical arrangement of the reinforcing ribs along the center line of the height direction ensures that the indentation is evenly distributed in the width direction of the electrode. Fixed shafts 52 are arranged axially outward at both ends of the roller body 51. The fixed shafts 52 are circular, and mounting holes 53 are symmetrically arranged on their outer circular surface. The roller body 51 and the fixed shafts 52 are coaxially arranged, and the diameter of the fixed shaft 52 is smaller than that of the roller body 51. The roller body 51 has a central through hole 54, the diameter of which is the same as the inner diameter of the fixed shaft 52. The tensile strength of the electrode tabs can be increased by 20%-30% using this pressure roller, reducing folding and breakage during die-cutting and winding. Curved indentation disperses stress, avoiding the risk of localized fracture. The reinforcing rib 55 protrudes from the roller body 51 at a height of 0.5-1mm, and the width of the boss of the reinforcing rib 55 is 0.5-1mm. The edges of the boss are chamfered, and the curvature of the top surface of the boss matches the curvature of the circumferential surface of the roller body 51. The indentation depth is controllable (0.08-0.12mm), without damaging the internal structure of the electrode sheet. The indentation edges are smooth, preventing stress concentration and fracture of the electrode tab during bending. The distance between adjacent reinforcing rib 55 tracks is 1-3mm, and the distance from the vertex of the reinforcing rib 55 track to the end face of the roller body 51 is 0.5-1.5mm. Increased edge strength of the electrode tab reduces edge damage during winding.

[0038] like Figure 4-7As shown, this utility model also provides a lithium-ion battery tab pressing device, including the aforementioned pressure roller 5, as well as a mounting base 6, a drive assembly 3, a guide rail 1, a slider 2, and a rotating bracket 4. The drive assembly 3 is mounted on the slider 2, the slider 2 is slidably connected to the guide rail 1, the piston rod of the drive assembly 3 is connected to the rotating bracket 4, and the pressure roller 5 is rotatably mounted on the rotating bracket 4 via the mounting base 6. The cylinder 3 drives the pressure roller 5 to slide along the guide rail 1 to achieve the pressing action. The rotating bracket 4 cooperates with the mounting base 6 to support the pressure roller and allow angle adjustment. The pressing force is uniformly transmitted (pressure 0.5-0.7MPa), and the indentation consistency reaches over 98%. The modular design makes maintenance convenient, and the pressure roller replacement time is shortened to less than 5 minutes. The mounting base 6 drives the pressure roller to press the entire plate onto the electrode foil area and rotates with the electrode conveyor belt. The reinforcing ribs 55 on the surface of the pressure roller directly contact the edge foil area of ​​the electrode, and the protrusions of the reinforcing ribs 55 uniformly press corresponding pressing marks on the foil surface. This process creates reinforcing ribs on the surface of the electrode after laser cutting, effectively improving the electrode's ability to withstand defects such as folding, breakage, and tearing during die-cutting or winding. It helps maintain a good electrode condition during the die-cutting and winding process, thereby effectively improving the yield of the electrode.

[0039] Specifically, the mounting base 6 includes a mounting base body 61 and an angle adjustment mechanism 62. The angle adjustment mechanism 62 includes a rotary lock 621 and a rotary positioning seat 622, used to adjust the angle between the pressure roller 5 and the horizontal direction of the electrode sheet. An outer frame 7 is fixed to the outside of the rotating bracket 4. The rotary positioning seat 622 cooperates with the angle groove 73 on the outer frame 7 to adjust the angle of the pressure roller (-6° to +6°). The adjusted angle is locked by the rotary lock 621. It is suitable for different electrode sheet thicknesses (8-25μm), and the indentation depth can be precisely adjusted.

[0040] Specifically, the outer frame 7 is provided with angle markings, and the angle adjustment mechanism 62 allows the pressure roller 5 to adjust its angle within the range of -6° to +6°, with the angle adjustment directions on both sides being centrally symmetrical. Symmetrical adjustment on both sides ensures stress balance on both sides of the electrode tab, achieving 99% indentation symmetry, thus meeting the needs of different electrode pressing ribs.

[0041] Furthermore, the outer frame 7 includes a metal frame 71 and a transparent display area 72 for real-time observation of the pressure roller's operating status. The transparent display area 72 is used to observe the operating status of the pressure roller 5. Operators can quickly detect abnormalities such as pressure roller jamming and electrode misalignment, reducing the defect rate.

[0042] Specifically, the rotating bracket 4 consists of a rotating base 41, a rotating connector 42, and a rotating fixed shaft 43. The mounting base 6 is connected to the rotating bracket 4 via the rotating fixed shaft 43, and the relative angle between the rotating bracket 4 and the mounting base 6 is fixed by a locking knob. The locking knob fixes the angle to prevent angular deviation during operation.

[0043] The reinforcing ribs 55 of the pressure roller 5 have a trajectory shape that is arc-shaped, U-shaped, elliptical, or circular, and at least two reinforcing ribs 55 are symmetrically distributed along the axial direction of the roller body 51. This structure can adapt to electrode sheets of different materials such as aluminum foil and copper foil, and the indentation effect is stable.

[0044] This device uses a drive assembly to move the pressure roller along the guide rail to above the electrode sheet. The angle between the pressure roller and the horizontal direction of the electrode sheet is adjusted (from 0° to ±6°) using a rotating bracket and an angle adjustment mechanism. This allows the continuous closed-loop curved reinforcing ribs on the surface of the pressure roller to contact the electrode tab area at different angles. During the tape feeding process, pressure is applied by rotation, forming a reinforcing indentation evenly distributed along the tape feeding direction and width direction on the electrode tab surface. At the same time, the angle adjustment allows for focused pressure on the top area of ​​the electrode tab, thereby effectively releasing the internal stress of the foil, enhancing the electrode tab's resistance to deformation, and reducing defects such as folding and tearing during die-cutting and winding.

[0045] For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A tab pressure roller for lithium-ion batteries, characterized in that, The roller body (51) includes multiple rows of reinforcing ribs (55) that are connected end to end, which are evenly distributed on the outer circumferential surface of the roller body (51). The reinforcing ribs (55) extend in a curve and are continuous and uninterrupted in radial extension with closed trajectory. They are arranged symmetrically along the axis of the roller body (51) and are connected and staggered symmetrically along the center line of the trajectory height of the reinforcing ribs (55).

2. The electrode pressure roller for lithium-ion batteries according to claim 1, characterized in that, The height of the reinforcing rib (55) protruding from the roller body (51) is 0.5-1mm. The width of the boss of the reinforcing rib (55) is 0.5-1mm, and the two sides of the boss have chamfers. The curvature of the top surface of the boss is consistent with the curvature of the circumferential surface of the roller body (51).

3. The electrode pressure roller for lithium-ion batteries according to claim 1, characterized in that, The distance between the tracks of two adjacent reinforcing ribs (55) is 1-3mm, and the distance between the vertex of the track of the reinforcing rib (55) and the end face of the roller body (51) is 0.5-1.5mm.

4. A device for pressing tabs on lithium-ion batteries, characterized in that, The device includes a pressure roller (5) as described in any one of claims 1-3, a mounting base (6), a drive assembly (3), a guide rail (1), a slider (2), and a rotating bracket (4); the drive assembly (3) is mounted on the slider (2), the slider (2) is slidably connected to the guide rail (1), the piston rod of the drive assembly (3) is connected to the rotating bracket (4), and the pressure roller (5) is rotatably mounted on the rotating bracket (4) via the mounting base (6).

5. The electrode tab pressing device for lithium-ion batteries according to claim 4, characterized in that, The mounting base (6) includes a mounting base body (61) and an angle adjustment mechanism (62). The angle adjustment mechanism (62) includes a rotary latch (621) and a rotary positioning seat (622) for adjusting the angle between the pressure roller (5) and the electrode in the horizontal direction. An outer frame (7) is fixed on the outside of the rotating bracket (4). The rotary latch (621) passes through the angle groove on the outer frame (7) and locks itself in the threaded hole on the rotary positioning seat (622). The adjusted angle is locked by the rotary latch (621).

6. The electrode clamping device for lithium-ion batteries according to claim 5, characterized in that, The outer frame (7) is provided with an angle mark, and the angle adjustment mechanism (62) allows the pressure roller (5) to adjust the angle within the range of -6° to +6°, and the angle adjustment directions on both sides are centrally symmetrical.

7. The electrode tab pressing device for lithium-ion batteries according to claim 5, characterized in that, The outer frame (7) includes a metal frame (71) and a transparent display area (72), which is used to observe the operating status of the pressure roller (5).

8. The electrode tab pressing device for lithium-ion batteries according to claim 5, characterized in that, The mounting base (6) is connected to the rotating bracket (4) via a rotating fixed shaft (43), and the relative angle between the rotating bracket (4) and the mounting base (6) is fixed by a locking knob.

9. The electrode tab pressing device for lithium-ion batteries according to claim 4, characterized in that, The reinforcing ribs (55) of the pressure roller (5) have a trajectory shape of one of arc, U, ellipse or circle, and at least two reinforcing ribs (55) are symmetrically distributed along the axial direction of the roller body (51).

10. The electrode tab pressing device for lithium-ion batteries according to claim 4, characterized in that, The drive component (3) is a cylinder.

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