A winding machine pole piece embossing roller device and a battery cell winding machine

Abstract

The utility model discloses a kind of winding machine pole piece embossing roller device and battery winding machine, belong to lithium battery manufacturing technical field. Embossing roller device includes vertical installation on vertical fixed plate on embossing roller assembly, into piece smoothing roller and out piece smoothing roller;Into piece smoothing roller and out piece smoothing roller are respectively arranged in the in piece side and out piece side of the embossing roller assembly. By increasing smoothing roller before and after embossing roller assembly, so that pole piece passes into piece smoothing roller, embossing roller assembly and out piece smoothing roller, form certain angle at embossing roller assembly, pole piece is taut at this place, shake little, can guarantee pole piece smoothly through embossing roller assembly;Effectively reduce the tension mutation of wavy edge pole piece in embossing process, reduce the risk of broken tape, improve winding machine operating efficiency and pole piece qualification rate, without speed production due to wavy edge problem.

Description

Technical Field

[0001] This utility model relates to a winding machine electrode embossing roller device and a cell winding machine, belonging to the field of lithium battery manufacturing technology. Background Technology

[0002] With the continuous development of the battery industry, the requirements for battery energy density are getting higher and higher, and the compaction density of the electrode sheets is also getting higher and higher. The P-roller technology for positive electrode sheet embossing in winding machines is widely used in the lithium battery cell winding and preparation industry. Its main functions are: (1) to increase the surface area of ​​the electrode sheet, which helps the electrolyte to wet; (2) to improve the uniformity of the thickness of the positive electrode sheet by adjusting the pressure of the P-roller, thereby reducing the misalignment of the electrode tabs. The working principle of the embossing P-roller is: through a pair of rollers, a rigid embossing roller and a soft rubber roller, a certain pressure is applied to the electrode sheet passing through the middle of the pair of rollers, so that the surface of the electrode sheet forms a series of dot-like protrusions and depressions without breaking it.

[0003] With the application of wide-width roll forming, the wavy edge of electrode sheets, especially positive electrode sheets, remains difficult to control perfectly. Positive electrode sheets with large wavy edges (above ±2μm) cause problems in the winding process, mainly manifested in the high risk of strip breakage when passing through the embossing P-roller, severely impacting winding machine efficiency and yield. A common practice is to reduce the winding machine speed when encountering wavy electrode sheets. This method affects winding machine efficiency and is only compatible with electrode sheets with wavy edges (within ±2μm). Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a winding machine electrode embossing roller device and a battery cell winding machine. By adding smoothing rollers before and after the embossing roller assembly, the electrode forms a certain angle at the embossing roller assembly when it passes through the infeed smoothing roller, the embossing roller assembly and the outfeed smoothing roller. The electrode is taut at this point and the vibration is minimal, which can ensure that the electrode passes through the embossing roller assembly smoothly.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] In a first aspect, this utility model provides a winding machine electrode embossing roller device, including an embossing roller assembly, an infeed smoothing roller, and an outfeed smoothing roller, which are vertically mounted on a vertical fixed plate; the infeed smoothing roller and the outfeed smoothing roller are respectively disposed on the infeed side and the outfeed side of the embossing roller assembly.

[0007] In the above technical solution, by setting up infeed smoothing rollers and outfeed smoothing rollers, the electrode sheet forms a certain angle at the embossing roller assembly when passing through the infeed smoothing roller, embossing roller assembly, and outfeed smoothing roller. The electrode sheet is taut at this point, with minimal vibration, ensuring that the electrode sheet passes smoothly through the embossing roller assembly. The embossing roller assembly, infeed smoothing roller, and outfeed smoothing roller are all installed perpendicular to the fixed plate, ensuring the parallelism of the three sets of rollers. This makes the tension distribution of the electrode sheet more uniform during operation, reducing local stress concentration caused by non-parallel rollers, thereby reducing the risk of strip breakage. It also ensures that the embossing pressure is applied evenly along the width of the roller surface, preventing the wavy edge electrode sheet from breaking due to local overpressure, while maintaining the consistency of embossing depth.

[0008] Furthermore, both the infeed smoothing roller and the outfeed smoothing roller are cantilever rollers.

[0009] In the above technical solution, the feed smoothing roller and the output smoothing roller are designed as cantilever roller structures, which simplifies the installation method, reduces the overall complexity of the device, and facilitates quick adjustment of the roller position to adapt to the processing requirements of different electrode sheets.

[0010] Furthermore, the embossing roller assembly includes an embossing P-roller and a pressing roller that are brought close to each other to extrude the electrode sheet under external force. The pressing roller is fixedly connected to the mounting base plate, and the embossing P-roller is slidably connected to the mounting base plate.

[0011] In the above technical solution, the structure of the pressing roller and the embossing P roller working together can stably emboss the electrode sheet. The sliding connection design of the embossing P roller can dynamically adjust the distance between the two rollers to adapt to the local deformation of the wavy edge electrode sheet, avoid excessive local pressure caused by the fixed distance, and improve the compatibility with the wavy edge electrode sheet.

[0012] Furthermore, the embossing P-roller is mounted on the embossing P-roller mounting plate, and the embossing P-roller mounting plate is slidably connected to the mounting base plate via a sliding assembly.

[0013] In the above technical solution, the cooperation between the embossing P-roller mounting plate and the sliding component makes the movement of the embossing P-roller more stable, ensures the linear controllability of the embossing pressure adjustment, improves the stability of the embossing process, and facilitates the adjustment of the gap of the embossing roller assembly to ensure embossing accuracy.

[0014] Furthermore, the sliding assembly includes a linear guide rail and a slider respectively arranged on the mounting base plate and the embossing P-roller mounting plate and capable of sliding relative to each other.

[0015] In the above technical solution, the sliding assembly of linear guide rail and slider is used to strictly limit the movement direction of the embossing P roller and reduce frictional resistance, so as to avoid the electrode sheet from generating additional stress due to mechanical vibration or sliding deviation, further reduce the problem of belt breakage, reduce wear, and extend the service life of the device.

[0016] Furthermore, it also includes a drive assembly, which comprises a cylinder, a cylinder mounting plate, and a cylinder pusher. The cylinder is fixed to the mounting base plate via the cylinder mounting plate, and the extended end of the cylinder is connected to the embossing P-roller mounting plate via the cylinder pusher, causing the embossing P-roller mounting plate to slide relative to the mounting base plate, thus bringing the embossing P-roller closer to the pressing roller to extrude the electrode sheet. Under the pressure of the embossing P-roller, the surface of the electrode sheet forms protrusions and indentations; different pressure levels result in different protrusion and indentation effects.

[0017] In the above technical solution, the embossing pressure is automatically adjusted by driving the embossing P-roller mounting plate to move with a cylinder. This can quickly respond to the dynamic deformation requirements of the wavy edge electrode, improve adjustment accuracy and production efficiency, and at the same time ensure uniform and stable embossing force, thereby improving the embossing quality of the electrode.

[0018] Furthermore, the pressing roller is connected to the mounting base plate via a pressing roller mounting block. The mounting base plate is fixed to the vertical fixing plate via a bottom triangular bracket, and the mounting base plate, the infeed smoothing roller, and the outfeed smoothing roller are located on the same side of the vertical fixing plate. The vertical fixing plate of this invention can be a separate plate as a connecting component fixed to the required position, or a vertical fixing surface from existing equipment can be used as the vertical fixing plate, allowing for flexible adjustment according to the actual production scenario.

[0019] In the above technical solution, the stability of the pressing roller is enhanced by fixing the base plate with the pressing roller mounting block and the triangular frame, ensuring that the electrode sheet is subjected to uniform force during the embossing process, preventing the embossing roller assembly from shifting due to the fluctuation of the wavy edge electrode sheet, and improving the stability, embossing accuracy and consistency of the embossing process.

[0020] Furthermore, the length a of the electrode sheet between the feed smoothing roller and the embossing roller assembly is 50mm~80mm; the length b of the electrode sheet between the output smoothing roller and the embossing roller assembly is 50mm~80mm.

[0021] In the above technical solutions, if the length is too short, it is prone to interference and inconvenient for threading; if the length is too long, the smoothing and anti-vibration effects are poor. The length can be controlled by adjusting the positions of the infeed smoothing roller and the outfeed smoothing roller, ensuring that the electrode sheet is fully stretched and uniformly controlled before embossing.

[0022] Furthermore, the angle between the electrode sheet between the infeed smoothing roller and the embossing roller assembly and the electrode sheet between the outfeed smoothing roller and the embossing roller assembly is 120°≤θ≤150°.

[0023] In the above technical solution, the size of the angle θ can also be achieved by adjusting the position of the infeed smoothing roller and the outfeed smoothing roller. By limiting the angle, the tension distribution of the electrode sheet during the embossing process is optimized, avoiding problems such as strip breakage or wrinkles caused by the angle being too small (too large tension) or too large (too large tension).

[0024] Secondly, this utility model also provides a battery cell winding machine, which is equipped with the winding machine electrode embossing roller device described in the first aspect.

[0025] In the above technical solution, after the battery cell winding machine is equipped with this device, it can directly accommodate the efficient embossing process of larger wavy edge electrode sheets, reduce downtime or speed reduction operations caused by strip breakage, and significantly improve the battery cell production efficiency and consistency.

[0026] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0027] The device described in this utility model adds smoothing rollers before and after the embossing roller assembly, so that when the electrode sheet passes through the infeed smoothing roller, the embossing roller assembly, and the outfeed smoothing roller, it forms a certain angle at the embossing roller assembly. The electrode sheet is taut at this point, with minimal vibration, which can ensure that the electrode sheet passes smoothly through the embossing roller assembly. It effectively reduces the tension change of the wavy edge electrode sheet during the embossing process, reduces the risk of strip breakage, improves the operating efficiency of the winding machine and the electrode sheet qualification rate, and eliminates the need to slow down production due to wavy edge problems. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a winding machine electrode embossing roller device provided in an embodiment of this utility model;

[0029] Figure 2 This is a front view of the electrode embossing roller device for the winding machine described in the embodiment;

[0030] Figure 3 This is a side view of the electrode embossing roller device of the winding machine described in the embodiment;

[0031] Figure 4 This is a top view of the electrode embossing roller device of the winding machine described in the embodiment.

[0032] In the diagram: 1. Vertical fixing plate; 2. Electrode sheet; 3. Infeed smoothing roller; 4. Outfeed smoothing roller; 5. Drive assembly; 51. Cylinder; 52. Cylinder fixing plate; 53. Cylinder push block; 6. Embossing roller assembly; 61. Embossing P roller; 62. Pressing roller; 63. Embossing P roller mounting plate; 64. Pressing roller mounting block; 7. Sliding assembly; 8. Mounting base plate; 9. Tripod. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[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, are based on the orientation or positional relationships shown in the accompanying drawings and 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 of 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," and "joining" 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] Example 1

[0037] This embodiment provides a device for embossing rollers on electrode sheets of a winding machine, such as... Figures 1 to 4 As shown, it includes an embossing roller assembly 6, an infeed smoothing roller 3, and an outfeed smoothing roller 4, which are vertically mounted on a vertical fixed plate 1; the infeed smoothing roller 3 and the outfeed smoothing roller 4 are respectively disposed on the infeed side and the outfeed side of the embossing roller assembly 6.

[0038] In this embodiment, as Figure 1 and Figure 3 As shown, the embossing roller assembly 6 includes an embossing P-roller 61 and a pressing roller 62. The pressing roller 62 is fixedly connected to the mounting base plate 8 via a pressing roller mounting block 64. The embossing P-roller 61 is mounted on an embossing P-roller mounting plate 63. The embossing P-roller mounting plate 63 is slidably connected to the mounting base plate 8 via a sliding assembly 7. The sliding assembly 7 consists of a pair of linear guide rails and a slider respectively arranged on the mounting base plate 8 and the embossing P-roller mounting plate 63 and capable of sliding relative to each other.

[0039] In this embodiment, as Figure 3 As shown, both the infeed smoothing roller 3 and the outfeed smoothing roller 4 are cantilever rollers, and the mounting base plate 8 is mounted on the vertical fixing plate 1 via the triangular bracket 9 at its bottom.

[0040] like Figure 1 and Figure 4 As shown, this embodiment also includes a drive assembly 5, which includes a cylinder 51, a cylinder fixing plate 52, and a cylinder pusher block 53. The cylinder 51 is fixed to the mounting base plate 8 by the cylinder fixing plate 53, and the extended end of the cylinder 51 is connected to the embossing P roller mounting plate 63 by the cylinder pusher block 53.

[0041] like Figure 1 and Figure 2 As shown, in this embodiment, the feeding route of the electrode sheet 2 is: infeed smoothing roller 3 → pressing roller 9 → outfeed smoothing roller 4. When the electrode sheet 2 is running, the cylinder 51 applies a pushing force to the cylinder pusher block 53, causing the embossing P roller mounting plate 63 to slide relative to the mounting base plate 8, so that the embossing P roller 61 moves closer to the pressing roller 62 to squeeze the electrode sheet 2. Under the pressure of the embossing P roller 61, the surface of the electrode sheet 2 forms protrusions and indentations. Different pressure levels result in different protrusion and indentation effects.

[0042] like Figure 2 As shown, the electrode 2 between the infeed smoothing roller 3 and the embossing roller assembly 6 and the electrode 2 between the outfeed smoothing roller 4 and the embossing roller assembly 6 form a certain angle θ. The size of θ can be achieved by adjusting the positions of the infeed smoothing roller and the outfeed smoothing roller. In different embodiments, it can be adjusted as needed between 120° and 150° according to the size of the electrode. At the same time, the length a of the electrode between the infeed smoothing roller and the embossing roller assembly is 50mm to 80mm; the length b of the electrode between the outfeed smoothing roller and the embossing roller assembly is 50mm to 80mm. If the length is too short, it is easy to interfere and it is inconvenient to thread the tape. If the length is too long, the smoothing and anti-vibration effect is not good.

[0043] Example 2

[0044] This utility model provides a battery cell winding machine, which is equipped with the winding machine electrode embossing roller device described in Embodiment 1.

[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A device for embossing rollers on electrode sheets of a winding machine, characterized in that, It includes an embossing roller assembly (6) vertically mounted on a vertical fixed plate (1), an infeed smoothing roller (3) and an outfeed smoothing roller (4); the infeed smoothing roller (3) and the outfeed smoothing roller (4) are respectively disposed on the infeed side and the outfeed side of the embossing roller assembly (6).

2. The winding machine electrode embossing roller device according to claim 1, characterized in that, Both the infeed smoothing roller (3) and the outfeed smoothing roller (4) are cantilever rollers.

3. The winding machine electrode embossing roller device according to claim 1, characterized in that, The embossing roller assembly (6) includes an embossing P roller (61) and a pressing roller (62) that move closer to each other under external force to the extrusion electrode (2). The pressing roller (62) is fixedly connected to the mounting base plate (8), and the embossing P roller (61) is slidably connected to the mounting base plate (8).

4. The winding machine electrode embossing roller device according to claim 3, characterized in that, The embossing P-roller (61) is mounted on the embossing P-roller mounting plate (63), and the embossing P-roller mounting plate (63) is slidably connected to the mounting base plate (11) through the sliding component (7).

5. The winding machine electrode embossing roller device according to claim 4, characterized in that, The sliding assembly (7) includes a linear guide and a slider that are respectively arranged on the mounting base plate (8) and the embossing P-roller mounting plate (63) and can slide relative to each other.

6. The winding machine electrode embossing roller device according to claim 4, characterized in that, It also includes a drive assembly (5), which includes a cylinder (51), a cylinder fixing plate (52) and a cylinder pusher (53). The cylinder (51) is fixed to the mounting base plate (8) by the cylinder fixing plate (52). The extended end of the cylinder (51) is connected to the embossing P roller mounting plate (63) through the cylinder pusher (53), which drives the embossing P roller mounting plate (63) to slide relative to the mounting base plate (8), so that the embossing P roller (61) moves closer to the pressing roller (62) to extrude the electrode sheet (2).

7. The winding machine electrode embossing roller device according to claim 3, characterized in that, The pressing roller (62) is connected to the mounting base plate (8) via the pressing roller mounting block (64). The mounting base plate (8) is fixed on the vertical fixing plate (1) via the tripod (9). The mounting base plate (8) is located on the same side of the vertical fixing plate (1) as the infeed smoothing roller (3) and the outfeed smoothing roller (4).

8. The winding machine electrode embossing roller device according to claim 1, characterized in that, The length a of the electrode plate (2) between the infeed smoothing roller (3) and the embossing roller assembly is 50mm~80mm; the length b of the electrode plate (2) between the outfeed smoothing roller (4) and the embossing roller assembly is 50mm~80mm.

9. The winding machine electrode embossing roller device according to claim 1, characterized in that, The angle between the electrode plate (2) between the infeed smoothing roller (3) and the embossing roller assembly and the electrode plate (2) between the outfeed smoothing roller (4) and the embossing roller assembly is 120°≤θ≤150°.

10. A battery cell winding machine, characterized in that, The battery cell winding machine is equipped with the winding machine electrode embossing roller device as described in any one of claims 1 to 9.

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