Composite current collector flattening roller, device and rolling equipment
By setting an antistatic layer and heating components in the composite current collector flattening roller, and using corona discharge to neutralize static electricity, the problems of impurity adsorption and edge wrinkling in the composite current collector during the rolling process are solved, thereby improving the quality of finished products and production efficiency.
Patent Information
- Application Number
- CN202422700602.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-11-06
AI Technical Summary
Composite current collectors are prone to adsorbing impurities and dust during the rolling process, which leads to a decline in surface quality, affecting performance and service life. At the same time, multiple rolling processes cause problems to accumulate, reducing production efficiency and finished product qualification rate.
The composite current collector flattening roller with a hollow structure has an internal antistatic layer and heating components. It uses the principle of corona discharge to neutralize static electricity, and the arc surface structure and flattening ribs increase friction to achieve static electricity removal and material flattening.
It effectively removes static electricity, prevents materials from adsorbing impurities and dust, reduces rolling processes, reduces problem accumulation, and improves finished product qualification rate and production efficiency.
Smart Images
Figure CN223642470U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of current collector processing, specifically to a composite current collector flattening roller, device, and rolling equipment. Background Technology
[0002] With the rapid development of the new energy industry, composite current collectors are being used more and more widely in battery manufacturing. Compared with traditional copper foil or aluminum foil current collectors, composite current collectors have higher safety, longer lifespan, and higher energy density.
[0003] In the rolling process of composite current collectors, multiple rollers are often used to address various issues that may arise during rolling, such as edge wrinkling and material adsorption of impurities. This not only affects the appearance quality of the final product but may also reduce its performance and service life.
[0004] Using multiple individual flattening rollers requires frequent replacement or readjustment for different materials, and multiple rounds of rolling can easily lead to the accumulation of problems, resulting in reduced product quality and production efficiency, increased production costs, and an inability to meet diverse production needs. Utility Model Content
[0005] The purpose of this utility model is to provide a composite current collector flattening roller, device, and rolling equipment, which can solve at least one of the aforementioned technical problems. The specific solution is as follows:
[0006] According to a specific embodiment disclosed in this utility model, the first aspect of this utility model discloses a composite current collector flattening roller, comprising: a roller body, wherein a hollow channel is provided along the axial direction in the roller body;
[0007] A roller is disposed within the hollow channel, the diameter of the roller being smaller than the diameter of the hollow channel, thereby forming an antistatic layer within the hollow channel;
[0008] An electrode is disposed within the first and second end faces of the roller body, and the electrode and the antistatic layer form an antistatic portion.
[0009] Preferably, the outer peripheral surface of the roller is an arc surface, and the arc of the arc surface is 2°-10°.
[0010] Preferably, it further includes: a cushion layer;
[0011] The padding layer is disposed along the outer periphery of the roller body, and flattening ribs are disposed on the padding layer.
[0012] Preferably, the composite current collector flattening roller further includes a heating component disposed within the hollow channel.
[0013] Preferably, the heating component is a heating wire, which is wound circumferentially along the inner wall of the roller.
[0014] Preferably, the heating component is a heating tube, which is disposed on the inner wall of the roller body.
[0015] Preferably, the shape of the flattening rib is a point, a straight line, a broken line, or a spiral.
[0016] Preferably, both the roller body and the roller shaft are made of steel.
[0017] The second aspect of this utility model discloses a composite current collector flattening roller device, comprising: a support, the aforementioned flattening roller, an adjustment mechanism, and a drive mechanism.
[0018] The flattening roller is mounted on the bracket via bearings;
[0019] The adjustment mechanism is connected to the flattening roller and is used to adjust the position and pressure of the flattening roller;
[0020] The drive mechanism is connected to the flattening roller and is used to drive the flattening roller to rotate.
[0021] The third aspect of this utility model discloses a composite current collector roller pressing device, comprising: the aforementioned composite current collector flattening roller device, located at the front of the roller pressing component of the composite current collector roller pressing device.
[0022] Compared with the prior art, the above-described solutions of the embodiments of this utility model have at least the following beneficial effects:
[0023] This invention achieves static electricity removal during the rolling process by incorporating an antistatic layer in the flattening roller, thus solving the problem of material adsorption of impurities and dust. It reduces the number of rolling steps, minimizes the accumulation of problems caused by multiple rolling processes, and prevents edge wrinkles in subsequent rolling operations, thereby improving the finished product yield and production efficiency. Attached Figure Description
[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles disclosed herein. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:
[0025] Figure 1 A schematic diagram of the overall structure of the composite current collector flattening roller provided in the first embodiment of this utility model;
[0026] Figure 2 A schematic diagram of the heating assembly provided in an embodiment of this utility model;
[0027] Figure 3 A schematic diagram of the antistatic layer structure provided in this embodiment of the utility model;
[0028] Figure 4 This is a schematic diagram showing the position of the composite current collector flattening roller device in the composite current collector roller pressing equipment provided in this embodiment of the utility model.
[0029] Figure label:
[0030] 1. Roller body, 2. Roller shaft, 3. Antistatic layer, 4. Electrode, 41. Positive electrode, 42. Negative electrode, 5. Heating wire, 6. Composite current collector flattening roller device. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments disclosed in this utility model, and not all of them. Based on the embodiments disclosed in this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0032] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the article or device that includes said element.
[0033] In the description of the utility model, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0035] The present invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by similar reference numerals. For clarity, the parts in the drawings are not drawn to scale.
[0036] The following is in conjunction with the appendix Figure 1-4 Detailed description of optional embodiments of this utility model.
[0037] Traditional current collectors are typically made of high-purity single metals or alloys, such as electrolytic aluminum or electrolytic copper, which possess high conductivity and ductility. While this pure metal structure is simple, it has limitations in terms of safety, weight, and energy density. Composite current collectors employ a three-layer structure of "metal-polymer-metal," with a middle layer of polymer material (such as PET, PP, or PI) and metal layers (such as copper or aluminum) plated on the top and bottom surfaces. This structure makes composite current collectors superior in terms of lightweight and safety.
[0038] The main structural difference between composite current collectors and traditional current collectors lies in their "sandwich" structure. Composite current collectors are composed of a metal layer, a polymer material layer, and another metal layer stacked sequentially. This results in a significant difference in the rolling process between composite current collectors and ordinary current collectors.
[0039] Traditional aluminum and copper foils are typically produced using a roll forming process, which involves lateral bending through multiple passes of rolls of varying shapes to ultimately form sheets with a specific cross-sectional shape. Furthermore, during the winding process, long-distance static eliminators are usually installed on one or more of the final winding machines to ensure the material is neutralized, preventing end-roll stretching and other issues that could cause unpleasant electric shocks to operators.
[0040] During the rolling process of composite current collectors, static electricity is generated due to friction between the raw materials (such as PET substrate and vapor-deposited metal layer) and the rollers. Dust and impurities attracted by this static electricity affect the surface quality of the composite current collector, thus impacting its performance in lithium batteries, such as increased internal resistance and decreased cycle performance. Therefore, compared to traditional current collectors, composite current collectors require greater attention to static electricity removal during the rolling process.
[0041] Example 1
[0042] like Figure 1 As shown, according to a specific embodiment of the present invention, the first embodiment of the present invention provides a composite current collector flattening roller, comprising:
[0043] Roller body 1, with a hollow channel arranged axially inside the roller body 1;
[0044] Roller 2 is disposed in the hollow channel, and the diameter of roller 2 is smaller than the diameter of the hollow channel, so that an antistatic layer 3 is formed in the hollow channel;
[0045] Electrode 4 is disposed within the first and second end faces of the roller body 1, and the electrode and the antistatic layer form an antistatic part.
[0046] In this embodiment, the composite current collector flattening roller adopts a hollow structure, forming an antistatic layer in the area between the roller body and the roller shaft. This layer, together with the electrodes at both ends, forms an antistatic section. The principle of corona discharge is used to solve the problem of material adsorption of impurities and dust. Compared with other antistatic methods such as installing a separate static eliminator or using materials or additives with antistatic functions, this method can reduce the number of processes and lower the rolling cost. At the same time, the pre-rolling of the composite current collector by the roller body can further avoid the problem of edge wrinkles during subsequent rolling processes.
[0047] Specifically, the roller body 1 is a cylindrical metal structure. Through holes are provided at the center of the first and second end faces on both sides of the roller body 1 for fixing the roller shaft 2. A positive electrode 41 and a negative electrode 42 are respectively provided in the first and second end faces of the roller body 1, as shown below. Figure 3 As shown, the closed space formed by the positive electrode 41, the negative electrode 42 and the static elimination layer 3 forms a static elimination part, which can be used as an ionization device to achieve ion neutralization, thereby achieving the purpose of neutralizing static electricity and removing dust and adsorbing impurities.
[0048] The specific process of electrostatic neutralization achieved by the composite current collector flattening roller in this embodiment is as follows: a high-voltage generator is connected to the positive and negative electrodes, thereby forming a stable high-voltage electric field within the hollow channel. Due to the small radius of curvature of the electrode surface, the local electric field strength exceeds the ionization field strength of the gas inside the roller, causing the air to ionize and be excited, forming ions and resulting in corona discharge.
[0049] In this embodiment, when the surface of the composite current collector is negatively charged, the formed ions will absorb the positive charge in the external airflow; when the surface of the composite current collector is positively charged, the ions will absorb the negative charge in the external airflow, thereby neutralizing the static electricity on the surface of the composite current collector and achieving the purpose of eliminating static electricity.
[0050] Compared to traditional current collectors that use a separate rubber antistatic roller for static removal, the rubber antistatic roller primarily utilizes internal conductive filler to conduct charge. When the rubber roller comes into contact with an object carrying static electricity, the static charge is conducted through the conductive filler within the rubber roller, eventually dissipating the charge. However, due to the relatively weak conductivity of rubber (even with the addition of conductive filler), its static removal speed is relatively slow, making it unsuitable for static removal in composite current collectors.
[0051] As an optional implementation, the diameter at the middle of the roller can be set to be larger than the diameter at both ends, thereby giving the outer surface of the roller a barrel-shaped structure with an elliptical arc. This arc structure can solve the problem of uneven force distribution caused by the large force at both ends and the small force in the middle of the collector during rolling, thus enhancing the flattening effect.
[0052] Preferably, the curvature of the arc surface can be 2°-10°, with 2° being the most preferred.
[0053] As an optional implementation, a heating component is installed on the inner wall of the roller within the hollow channel. For conventional current collectors, especially composite current collectors, heating can improve the ductility of the intermediate polymer material (such as PET, PP, or PI), which helps reduce wrinkles and curling during rolling.
[0054] Specifically, such as Figure 2 As shown, the heating component can be a heating wire 5, which is spirally and uniformly wound on the inner wall of the roller. The heating temperature of the heating wire should not exceed 50 degrees Celsius.
[0055] In other alternative embodiments, the heating wire can be fixed to the inner wall of the roller by means of bonding, embedding, or preforming.
[0056] In other alternative embodiments, a plurality of heating tubes may be evenly distributed on the inner wall of the roller.
[0057] As an optional implementation, a pad layer is provided on the outer peripheral surface of the roller body 1, and several raised or recessed flattening ribs are provided on the pad layer to increase the friction with the composite current collector and better achieve the flattening effect.
[0058] Preferably, the flattening ribs are in the shape of dots, straight lines, broken lines, or spirals, and are evenly distributed on the padding layer.
[0059] As an optional implementation, the roller body, roller shaft, and pad layer are all made of steel.
[0060] Alternatively, chilled cast iron, forged steel, alloy tool steel, high-speed steel, or stainless steel may be used.
[0061] In summary, this embodiment provides a composite current collector flattening roller. Utilizing its curved, barrel-shaped metal roller structure, it solves the problem of uneven force distribution during rolling, where the current collector experiences greater force at both ends and less force in the middle, thus enhancing the flattening effect. The internal heating component ensures the polymer material in the middle layer of the composite current collector has good ductility, preventing wrinkles and curling during rolling. Simultaneously, the antistatic layer formed within the roller body utilizes corona discharge to address the issue of material adsorption of impurities and dust. Furthermore, a textured pad layer is provided on the outer surface of the roller body 1 to increase friction with the composite current collector during rolling, further improving the flattening effect. Therefore, this composite current collector flattening roller, by possessing the above functions, integrates flattening rollers with different functions, reduces the accumulation of problems caused by multiple rolling passes, and improves the finished product qualification rate and production efficiency.
[0062] Example 2
[0063] This utility model also discloses device embodiments that are consistent with the above embodiments. The interpretation of the same name meaning is the same as that of the above embodiments, and they have the same technical effects as those of the above embodiments. They will not be described again here.
[0064] A composite current collector flattening roller device includes: a support frame, a flattening roller as described in Example 1, an adjustment mechanism, and a drive mechanism.
[0065] The flattening roller is mounted on the bracket via bearings, and the length of the flattening roller is much greater than the width of the composite current collector;
[0066] The adjustment mechanism is connected to the flattening roller and is used to adjust the relative position of the flattening roller and the composite current collector and the pressure during rolling.
[0067] The drive mechanism is connected to the flattening roller and is used to drive the flattening roller to rotate.
[0068] Furthermore, the adjustment mechanism includes a lead screw, a slider, and a handwheel. By rotating the handwheel, the lead screw is driven to rotate, causing the flattening roller fixed on the slider to move laterally along the lead screw along with the slider, thereby changing the position and pressure of the flattening roller relative to the composite current collector.
[0069] The composite current collector flattening roller device in this embodiment achieves the function of simultaneously eliminating static electricity during the rolling process by setting an antistatic layer in the flattening roller, thus solving the problem of material adsorption of impurities and dust. This reduces the number of steps in the rolling process, minimizes the accumulation of problems caused by multiple rolling passes, and avoids edge wrinkling in subsequent rolling processes, thereby improving the finished product qualification rate and production efficiency.
[0070] Example 3
[0071] This utility model discloses a composite current collector roller pressing device, including: the composite current collector flattening roller device of Embodiment 2. For example... Figure 4 As shown, the composite current collector flattening roller device 6 is placed in front of the rolling component of the equipment as the previous step of the rolling step to pre-roll the composite current collector.
[0072] By using a composite current collector flattening roller device, static electricity removal is achieved simultaneously during the pre-rolling process, solving the problem of material adsorption of impurities and dust. This reduces the number of steps in the rolling process, minimizes the accumulation of problems caused by multiple rolling passes, and prevents edge wrinkling during subsequent rolling processes, thereby improving the finished product qualification rate and production efficiency.
[0073] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems or apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.
[0074] The above embodiments are only used to illustrate the technical solutions disclosed in this utility model, and are not intended to limit it. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments disclosed in this utility model.
Claims
1. A composite current collector flattening roller, characterized in that, include: A roller body, wherein a hollow channel is provided along the axial direction within the roller body; A roller is disposed within the hollow channel, the diameter of the roller being smaller than the diameter of the hollow channel, thereby forming an antistatic layer within the hollow channel; An electrode is disposed within the first and second end faces of the roller body, and the electrode and the antistatic layer form an antistatic portion.
2. The composite current collector flattening roller according to claim 1, characterized in that, The outer periphery of the roller is an arc surface with an arc angle of 2°-10°.
3. The composite current collector flattening roller according to claim 1, characterized in that, Also includes: Subbase; The padding layer is disposed along the outer periphery of the roller body, and flattening ribs are disposed on the padding layer.
4. The composite current collector flattening roller according to claim 1, characterized in that, The composite current collector flattening roller also includes a heating component disposed within the hollow channel.
5. The composite current collector flattening roller according to claim 4, characterized in that, The heating component is a heating wire, which is wound circumferentially along the inner wall of the roller.
6. The composite current collector flattening roller according to claim 4, characterized in that, The heating component is a heating tube, which is disposed on the inner wall of the roller.
7. The composite current collector flattening roller according to claim 3, characterized in that, The shape of the flattening rib can be a point, a straight line, a broken line, or a spiral.
8. The composite current collector flattening roller according to any one of claims 1-7, characterized in that, Both the roller body and the roller shaft are made of steel.
9. A composite current collector flattening roller device, characterized in that, include: The support frame, the flattening roller as described in any one of claims 1-8, the adjusting mechanism, and the driving mechanism. The flattening roller is mounted on the bracket via bearings; The adjustment mechanism is connected to the flattening roller and is used to adjust the position and pressure of the flattening roller; The drive mechanism is connected to the flattening roller and is used to drive the flattening roller to rotate.
10. A composite current collector roller pressing device, characterized in that, include: The composite current collector flattening roller device as described in claim 9 is located in front of the roller pressing component of the composite current collector roller pressing equipment.