Smoothing device and smoothing roller for winding of lithium battery current collector carbon coating unit

Abstract

The flattening device comprises a base frame, a pair of air cylinders, a pair of supporting arms, a mandrel and the flattening roller, the two air cylinders are symmetrically installed on the two sides of the upper surface of the base frame and extend upwards in the mode of being perpendicular to the base frame, the two supporting arms are installed at the ends of telescopic rods of the corresponding air cylinders respectively, and the mandrel extends upwards in the mode of being perpendicular to the base frame. The two ends of the core shaft are rotationally installed on the supporting arms on the corresponding sides respectively, and the smoothing roller is installed on the core shaft. According to the utility model, through the telescopic driving of the cylinder and the design of the flexible smoothing surface of the smoothing roller, an effective isobaric smoothing effect can be applied to a carbon coating area and a blank area which are different in height, the smoothing pressing acting force can be adjusted in real time according to the rolling diameter and the rolling condition, and under the conditions that the number of lamination layers is increased, namely the rolling diameter is increased or the rolling shape is poor and wrinkles are serious, the production efficiency is greatly improved. And by continuously increasing the flattening pressure, the coating can be protected against excessive pressure when the carbon coating area is flattened, meanwhile, the blank area can be laminated and flattened, and the stability of the winding process and the winding effect is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion battery production, in particular to a smoothing device and a smoothing roller for winding a lithium battery current collector carbon coating unit. Background Art

[0002] Carbon coating of aluminum foil and copper foil uses coating technology to apply carbon black, graphite and other materials on the surface and dry them to form a conductive layer. After drying, the foil is rolled up for use in the next process. To improve efficiency, the current collector is generally carbon coated on both sides of the wider foil with 2-4 carbon coating areas with a thickness of 2-5um. Each carbon coating area is then cut out and used as a coating roller substrate for the active material of the electrode. There are uncoated areas (i.e. "white areas") between the multiple coatings during carbon coating.

[0003] Due to the thickness difference between the coated area and the blank area, only the carbonized area can always maintain close contact between layers during winding. Due to the height difference between the blank area and the carbonized area, there will be gaps between the layers in the blank area during the winding and stacking process, and there will be residual air in the gaps. As the roll diameter continues to increase and the number of stacked layers increases to hundreds or thousands of layers, the number of inter-layer gaps and the amount of residual air in the blank area will increase. If they are not smoothed out, the foil will often be wrinkled, "tower-shaped", and the blank area will be uneven, affecting subsequent use and causing a certain amount of scrap.

[0004] At present, the winding mechanism of the collector carbon coating equipment basically adopts roller smoothing to improve the above problems, but the existing technology adopts steel rollers or steel rollers with rubber coating as smoothing rollers. The roller surfaces of steel rollers and rubber coating rollers cannot achieve local deformation. When pressing down and smoothing, they cannot always maintain effective contact with the carbonized areas and blank areas with inconsistent heights and different degrees of fit. Most of the smoothing rollers are pressed on the carbonized areas. When the roll diameter is small during the initial winding, the foil roll is deformed due to the pressure of the smoothing roller, and the smoothing roller can still contact the middle blank area. However, as the winding diameter continues to increase, the middle blank area has more and more superimposed gap layers. In order to protect the coating of the coating area, it is impossible to continue to increase the downward pressure of the smoothing roller so that the roller surface and the blank area can always maintain effective contact. When the middle blank area is wound and stacked, residual air will continue to accumulate in the gap of each layer, which will eventually cause problems such as poor roll shape and blank wrinkles. The smoothing effect of the existing technology is not ideal. Utility Model Content

[0005] The purpose of the utility model is to provide a smoothing device and a smoothing roller for winding up a lithium battery current collector carbon coating unit, which effectively solves the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above-mentioned purpose, the present utility model provides the following technical solutions.

[0007] A smoothing device for winding a lithium battery current collector carbon coating unit includes a base frame, a pair of cylinders, a pair of support arms, a core shaft and a smoothing roller. The two cylinders are symmetrically mounted on both sides of the upper surface of the base frame and both extend upward perpendicular to the base frame. The two support arms are respectively mounted on the ends of the telescopic rods of the corresponding cylinders. The two ends of the core shaft are rotatably mounted on the support arms on the corresponding sides. The smoothing roller is mounted on the core shaft. The smoothing roller is a flexible air expansion roller with a flexible extrusion surface distributed around the smoothing roller.

[0008] Furthermore, both ends of the core shaft are equipped with bearing bodies and are installed in the bearing seat together. A holder is fixed on each arm, and the two bearing seats are matched and installed in the corresponding holders respectively. Two adjusting bolts are symmetrically threaded on the two holders, and the ends of the two adjusting bolts are rotatably connected to the outer surface of the corresponding bearing seat respectively. The two adjusting bolts on one side extend horizontally, and the two adjusting bolts on the other side extend vertically.

[0009] Furthermore, a supporting connecting rod is fixed on one side of the core shaft between the two arms, and the extending direction of the supporting connecting rod is consistent with the extending direction of the core shaft.

[0010] Furthermore, the utility model also provides a smoothing roller, comprising a pair of flanges A, a pair of outer cylindrical bodies, a pair of flanges B and a rubber cylinder. The two flanges A are sealed and fixedly mounted on both sides of the core shaft, and the two outer cylindrical bodies are sealed and fixedly mounted on the outer edge walls of the corresponding flanges A. The two outer cylindrical bodies respectively have step portions. The rubber cylinders are distributed around the core shaft, and the two ends are respectively mounted on the step portions on the corresponding sides. The outer peripheral walls of the two step portions and the inner edge walls of the rubber cylinders are respectively bonded and sealed with a sealing layer. An inflation chamber is formed between the inner walls of the two outer cylindrical bodies, the inner sides of the flanges A, the outer walls of the core shaft and the inner walls of the rubber cylinder. One of the outer cylindrical bodies is provided with a valve core valve for inflating the inflation chamber, and the other outer cylindrical body is provided with a pressure gauge for detecting the air pressure in the inflation chamber. The two ends of the core shaft are respectively fixedly mounted with flanges B, and the sides of the two flanges B that are close to each other are fixedly abutted against the outer cylindrical bodies on the corresponding sides.

[0011] Furthermore, when inflated, the rubber cylinder bulges more toward the middle, and the highest point of the bulge in the middle of the rubber cylinder is 10-15 mm higher than the outer circle of the outer body at the non-step position.

[0012] Furthermore, both ends of the rubber cylinder are fastened to the step portions on the corresponding side outer cylindrical body by evenly distributed fastening bolts, and both ends of the rubber cylinder are equipped with fixing clamps for fastening it to the step portions.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0014] The utility model can implement effective isobaric smoothing on carbonized areas and blank areas of unequal heights through the design of the telescopic drive of the cylinder and the flexible smoothing surface of the smoothing roller, and can adjust the smoothing downward pressure in real time according to the roll diameter and the winding condition. When the number of layers increases, that is, the roll diameter increases or the roll shape is poor and the wrinkles are serious, by continuing to increase the smoothing pressure, the coating can be protected from excessive pressure when smoothing the carbonized area, and the blank area can also be fitted and smoothed, ensuring the stability of the winding process and the winding effect. Through the above comprehensive effects, the interlayer bonding of multiple blank areas in the roll can be achieved, the residual air between the layers of the blank area can be effectively discharged, the roll shape can be kept stable, wrinkles can be reduced, the unevenness of the blank area can be improved, and the winding effect of the carbonized collector due to the different thickness of the width direction coating and the blank area can be improved, thereby reducing the amount of scrap winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structural installation of one end of the core shaft in the utility model;

[0017] Figure 3 This is a schematic diagram of the structural installation of the other end of the core shaft in the present invention;

[0018] Figure 4 This is a schematic diagram of the cross-sectional structure of the smoothing roller in the present invention;

[0019] Figure 5 for Figure 4 A magnified schematic diagram of the structure in the middle.

[0020] In the figure: 1. Base frame; 2. Cylinder; 3. Support arm; 4. Support connecting rod; 5. Core shaft; 51. Bearing body; 52. Bearing seat; 53. Clamping seat; 54. Adjusting bolt; 6. Smoothing roller; 601. Valve core valve; 602. Pressure gauge; 61. Flange A; 62. Outer body; 621. Step portion; 622. Sealant layer; 623. Fastening bolt; 624. Fixing clamping ring; 63. Flange B; 64. Rubber cylinder. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms, "connection", and "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "communication" can be a direct connection or an indirect connection through an intermediate medium. Here, "fixed" means that the two are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present invention, such as "inside", "outside", "top", "bottom", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0023] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0024] See also Figure 1-Figure 5 The utility model provides a smoothing device for winding up a lithium battery current collector carbon coating unit, comprising a base frame 1, a pair of cylinders 2, a pair of support arms 3, a core shaft 5 and a smoothing roller 6. The two cylinders 2 are symmetrically mounted on both sides of the upper surface of the base frame 1 and extend upward perpendicular to the base frame 1. The two support arms 3 are respectively mounted on the ends of the telescopic rods of the corresponding cylinders 2. The telescopic ends of the cylinders 2 are hinged to the support arms 3 through pins. The two ends of the core shaft 5 are respectively rotatably mounted on the support arms 3 on the corresponding sides, and the smoothing roller 6 is mounted on the core shaft 5. Through the synchronous extension and contraction of the two cylinders 2, the connection between the two support arms 3 can drive the core shaft 5 and the smoothing roller 6 to complete the lifting and pressing actions, thereby realizing the adjustment of the smoothing pressure, and then the smoothing downward pressure can be adjusted in real time according to the roll diameter and winding condition.

[0025] When the stacking increases and the roll diameter increases, by increasing the smoothing pressure, the smoothing extrusion surface of the smoothing roller 6 can always maintain equivalent contact and extrusion with the coating area and the blank area, so that the gaps between the blank area layers are eliminated, and the blank area layers are bonded to each other, and the residual air between the layers of the multi-layer blank area in the roll is effectively discharged, the roll shape is maintained, wrinkles are reduced, and the unevenness of the blank area is improved, and the winding effect of the carbon-coated collector due to the different coating and blank area thickness in the width direction is improved, thereby reducing the amount of scrapped winding.

[0026] The smoothing roller 6 adopts a flexible air-expansion roller, which has a flexible extrusion surface distributed around the smoothing roller 6. The smoothing roller 6 has an inflation effect. Compressed air of a certain pressure is introduced into it to make it have the ability to flexibly deform. It can adapt to the unevenness of the coating area and the blank area and perform flexible deformation to ensure the fitting and smoothing effect. The two cylinders 2 on both sides work in an extension and contraction manner to realize the lifting and pressing down of the core shaft 5 and the smoothing roller 6. The extension and contraction adjustment cylinder 2 realizes the pressure adjustment of the smoothing and pressing. When pressing down, the flexible extrusion surface of the smoothing roller 6 completely covers the entire width of the carbonized area. The inflated flexible surface contacts the coating roll to realize the effects of roll shape control, wrinkle removal, smoothing of the coating area and the blank area, and improve the winding quality.

[0027] The two adjusting bolts 54 are symmetrically threaded on the two clamping seats 53, and the ends of the two adjusting bolts 54 are rotatably connected to the outer surfaces of the corresponding bearing seats 52. The two adjusting bolts 54 on one side extend horizontally. By screwing the two adjusting bolts 54 on this side, the bearing seat 52 and the end of the core shaft 5 on this side can be fine-tuned in the horizontal direction. The two adjusting bolts 54 on the other side extend vertically. By screwing the two adjusting bolts 54 on this side, the bearing seat 52 and the end of the core shaft 5 on this side can be fine-tuned in the vertical direction. When the smoothing device is installed, the parallelism between the smoothing roller 6 and the winding mechanism can be adjusted.

[0028] Specifically, a supporting connecting rod 4 is fixed on one side of the core shaft 5 between the two arms 3. The extension direction of the supporting connecting rod 4 is consistent with the extension direction of the core shaft 5. By adding the supporting connecting rod 4 between the two arms 3, a supporting and connecting effect is achieved, ensuring that the overall structure is more stable.

[0029] See also Figure 1 、 Figure 4 and Figure 5 The utility model also provides a smoothing roller, including a pair of flanges A61, a pair of outer cylindrical bodies 62, a pair of flanges B63 and a rubber cylinder 64. The two flanges A61 are sealed and fixedly sleeved on both sides of the core shaft 5, and the two outer cylindrical bodies 62 are respectively sealed and fixedly sleeved on the outer edge walls of the corresponding flanges A61. The two outer cylindrical bodies 62 respectively have step portions 621, and the depth of the step portions 621 is 7-14 mm.

[0030] The rubber cylinder 64 is distributed around the core shaft 5, and its two ends are respectively mounted on the step portions 621 on the corresponding sides. The thickness of the rubber cylinder 64 is 3-8 mm. The outer peripheral walls of the two step portions 621 and the inner edge walls of the rubber cylinder 64 are respectively bonded and sealed with a sealant layer 622. The thickness of the sealant layer 622 is 4-6 mm.

[0031] An inflation chamber is formed between the inner walls of the two outer round bodies 62, the inner side of the connecting flange A61, the outer wall of the core shaft 5 and the inner wall of the rubber cylinder 64. A valve core valve 601 for inflation and deflation is provided on one of the outer round bodies 62, and a pressure gauge 602 for detecting the air pressure in the inflation chamber is provided on the other outer round body 62. A certain amount of compressed air is introduced into the inflation chamber through the valve core valve 601, and the pressure gauge 602 is used to read the reading. When the internal air pressure is excessive, the air is deflated through the valve core valve 601 until the air pressure reaches 0.2-0.4MPa. The closer the rubber cylinder 64 is to the middle part, the more it bulges. At this time, the highest point of the bulge in the middle of the rubber cylinder 64 is 10-15mm higher than the outer circle of the outer round body 62 at the non-step part.

[0032] Flanges B63 are fixedly mounted on both ends of the core shaft 5 , and the sides of the two flanges B63 that are close to each other are fixedly abutted against the outer circular body 62 on the corresponding sides, thereby reinforcing the outer circular body 62 .

[0033] Specifically, the two ends of the rubber cylinder 64 are fastened to the step portion 621 on the corresponding side outer circular body 62 by evenly distributed fastening bolts 623. Both ends of the rubber cylinder 64 are equipped with a fixing clamp 624 for fastening it to the step portion 621, which cooperates with the sealant layer 622 to achieve multiple fixing effects on the rubber cylinder 64.

[0034] Among them, the smoothing device and all rigid parts on 6 are made of 45# steel or stainless steel, and the rubber cylinder 64 is made of wear-resistant rubber skin.

[0035] In addition, the base frame 1 is installed on the base of the winding mechanism, and the ends of the two support arms 3 are connected to the base of the winding mechanism through rotatable pins, and the bottom of the cylinder 2 is rotatably hinged to the upper surface of the base frame 1. After the two support arms 3 are connected to the base of the winding mechanism through the pins, the rigid part of the smoothing roller 6 is pre-adjusted to be parallel to the winding mechanism base through the adjusting bolts 54 on both sides. The smoothing roller 6 is lifted by extending the cylinder 2, and the carbonization process is started. After the winding starts, the contraction pressure of the cylinder 2 is set to press the support arms 3 downward, thereby driving the smoothing roller 6 to press on the roll. During the process, the parameters of the cylinder 2 are adjusted at any time to ensure that the flexible inflated surface maintains effective contact with the carbonization area and the blank area.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A smoothing device for winding up a lithium battery current collector carbon coating unit, characterized by: It comprises a base frame (1), a pair of cylinders (2), a pair of supporting arms (3), a core shaft (5) and a smoothing roller (6); The two cylinders (2) are symmetrically mounted on both sides of the upper surface of the base frame (1) and both extend upward perpendicularly to the base frame (1); the two supporting arms (3) are respectively mounted on the ends of the telescopic rods of the corresponding cylinders (2); Both ends of the core shaft (5) are rotatably mounted on the supporting arms (3) on the corresponding sides, and the smoothing roller (6) is mounted on the core shaft (5); The smoothing roller (6) is a flexible air expansion roller having a flexible extrusion surface distributed around the smoothing roller (6).

2. The smoothing device for winding up a lithium battery current collector carbon coating unit according to claim 1, characterized in that: Both ends of the core shaft (5) are fitted with bearing bodies (51) and are installed together in a bearing seat (52); A clamping seat (53) is fixed on each of the two supporting arms (3), and the two bearing seats (52) are respectively matched and installed in the corresponding clamping seats (53); Two adjusting bolts (54) are symmetrically threaded on the two clamping seats (53), and the ends of the two adjusting bolts (54) are rotatably connected to the outer surfaces of the corresponding bearing seats (52). The two adjusting bolts (54) on one side extend horizontally, and the two adjusting bolts (54) on the other side extend vertically.

3. The smoothing device for winding up a lithium battery current collector carbon coating unit according to claim 1, characterized in that: A supporting connecting rod (4) is also fixed between the two supporting arms (3) on one side of the core shaft (5), and the extending direction of the supporting connecting rod (4) is consistent with the extending direction of the core shaft (5).

4. A smoothing roller, mounted on the core shaft (5) according to any one of claims 1 to 3, characterized in that: It comprises a pair of flanges A (61), a pair of outer cylindrical bodies (62), a pair of flanges B (63) and a rubber cylinder (64); The two flanges A (61) are fixedly sleeved on both sides of the core shaft (5) in a sealing manner, and the two outer cylindrical bodies (62) are respectively fixedly sleeved on the outer edge walls of the corresponding flanges A (61); The two outer circular bodies (62) are respectively provided with a step portion (621), the rubber cylinder (64) is distributed around the core shaft (5), and the two ends are respectively sleeved on the step portion (621) on the corresponding side, and the outer peripheral walls of the two step portions (621) and the inner edge wall of the rubber cylinder (64) are respectively bonded and sealed by a sealing rubber layer (622); An air-filled cavity is formed between the inner walls of the two outer circular bodies (62), the inner side of the flange A (61), the outer wall of the core shaft (5), and the inner wall of the rubber cylinder (64); One of the outer round bodies (62) is provided with a valve core valve (601) for inflating the air in the air cavity, and the other outer round body (62) is provided with a pressure gauge (602) for detecting the air pressure in the air cavity; The two ends of the core shaft (5) are respectively fixedly sleeved with the flanges B (63), and the sides of the two flanges B (63) close to each other are respectively fixedly abutted against the outer circular body (62) on the corresponding side.

5. The smoothing roller according to claim 4, characterized in that: When inflated, the rubber cylinder (64) bulges more as it approaches the middle portion, and the highest point of the bulge in the middle portion of the rubber cylinder (64) is 10-15 mm higher than the outer circle of the non-step portion of the outer cylindrical body (62).

6. The smoothing roller according to claim 4, characterized in that: Both ends of the rubber cylinder (64) are fastened to the step portions (621) on the outer cylindrical body (62) on the corresponding side by evenly distributed fastening bolts (623); Both ends of the rubber cylinder (64) are fitted with fixing rings (624) for fastening the rubber cylinder to the step portion (621).

Images