Resistance-resistant lithium battery diaphragm arc-shaped roller

Abstract

The utility model discloses an anti-resistance lithium battery diaphragm arc-shaped roller which comprises a hollow aluminum arc-shaped roller body, detachable shaft heads are installed at the two ends of the roller body, rotating bearings embedded in the roller body are installed on the surfaces of the detachable shaft heads, and the other sides of the rotating bearings are connected with a rack. A tension adjusting module connected with an external controller is installed on the outer side of the rotating bearing, a composite coating structure is arranged on the surface of the roller body and comprises a bottom layer, a middle layer and a surface layer which are sequentially arranged on the surface of the roller body from inside to outside, and a spiral groove is formed in the roller body in the circumferential direction of the roller surface. The anti-static coating on the surface and the conductive fiber net in the groove have a synergistic effect, static electricity is rapidly guided out, charge accumulation on the surface of the diaphragm is avoided, the multi-layer ceramic coating is combined with the aluminum roller body for light-weight design, abrasion resistance is improved, the roller is suitable for the high-speed coating technology, slurry is guided to flow in two directions through the spiral groove, and coating uniformity is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium battery separator production equipment, and in particular to an anti-resistance lithium battery separator arc roller, used for the flattening, lamination and coating processes of lithium battery separators, especially suitable for separator processing scenarios with high precision and low resistance requirements. Background Technology

[0002] Battery separators need to possess high insulation, a uniform microporous structure, and antistatic properties. In traditional processing, separators are prone to uneven resistance due to static electricity accumulation, affecting battery safety. In existing technologies, curved rollers are mostly used to flatten the separator, but their surface treatment and material selection do not specifically address the resistance control issue, and they are prone to generating static electricity due to friction, causing the separator to attract foreign objects or deform the micropores. For example, while conventional ceramic-coated rollers are wear-resistant, they lack antistatic design; and while nitrile rubber materials have antistatic properties, their wear resistance is insufficient. Utility Model Content

[0003] To address the aforementioned technical problems, an arc-shaped roller with anti-resistance, anti-static, and wear-resistant properties is provided. Through composite coating and structural design optimization, the problems of static electricity accumulation, uneven resistance, and surface wear in diaphragm processing are solved.

[0004] To achieve the above objectives, this utility model discloses an anti-resistance lithium battery separator arc roller, comprising a hollow aluminum arc roller body, with detachable shaft heads installed at both ends of the roller body, and a rotating bearing embedded in the roller body installed on the surface of the detachable shaft head. The other side of the rotating bearing is connected to the frame, and a tension adjustment module connected to an external controller is installed on the outside of the rotating bearing. A composite coating structure is provided on the surface of the roller body, comprising a bottom layer, an intermediate layer and a surface layer arranged sequentially from the inside to the outside of the roller body surface. A spiral groove is provided on the roller body along the circumferential direction of the roller surface.

[0005] Furthermore, the bottom layer is a roughened metal bonding layer with a thickness of 0.5μm to 3μm.

[0006] Furthermore, the intermediate layer is a plasma-sprayed alumina ceramic coating with a thickness of 50μm to 100μm.

[0007] Furthermore, the surface layer is an antistatic coating doped with conductive carbon nanotubes, with a thickness of 10μm to 20μm.

[0008] Furthermore, the spiral groove has an inverted trapezoidal cross-section, a groove depth of 0.3mm to 0.7mm, a groove width of 1mm to 5mm, and a groove spacing of 10mm to 30mm.

[0009] Furthermore, the spiral groove is embedded with a micro-conductive fiber mesh, which is connected to the surface layer to form a static dissipation path.

[0010] Furthermore, the surface of the detachable shaft head is covered with nitrile rubber.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model discloses an anti-static lithium battery separator arc roller. The antistatic coating on the surface and the conductive fiber mesh in the groove work together to quickly discharge static electricity and avoid the accumulation of charge on the separator surface. The multi-layer ceramic coating combined with the lightweight design of the aluminum roller body improves wear resistance and is suitable for high-speed coating processes. The spiral groove guides the bidirectional flow of the slurry and improves the coating uniformity. Attached Figure Description

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is the front view of the present invention.

[0015] Figure 3 This utility model Figure 2 A partial cross-sectional view at point A in the middle.

[0016] In the figure: 1 is the roller body; 11 is the detachable shaft head; 2 is the rotating bearing; 3 is the tension adjustment module; 4 is the spiral groove; 5 is the composite coating structure; 51 is the bottom layer; 52 is the intermediate layer; 53 is the surface layer; 6 is the micro conductive fiber mesh. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] One embodiment of this utility model is as follows: Figure 1 and Figure 2As shown, detachable shaft heads 11 are installed at both ends of the roller body 1. Rotary bearings 2 embedded in the roller body 1 are installed on the surface of the detachable shaft heads 11. The other side of the rotary bearings 2 is connected to the frame, reducing weight and minimizing flexural deformation. A tension adjustment module 3 connected to an external controller is installed on the outside of the rotary bearings 2. Specifically, the tension adjustment module uses a magnetic powder clutch, dynamically adjusting the roller surface tension through the external controller to prevent uneven resistance of the diaphragm due to excessive pressure. It is suitable for diaphragms of different thicknesses between 5μm and 50μm, avoiding mechanical damage. As a conventional feature in this field, the magnetic powder clutch structure will not be described in detail in this application. A composite coating structure 5 is provided on the surface of the roller body 1. The composite coating structure 5 includes... The roller body 1 is composed of a bottom layer 51, an intermediate layer 52, and a surface layer 53 arranged sequentially from the inside out. The roller body 1 has a spiral groove 4 arranged around the roller surface. The antistatic coating on the surface and the conductive fiber mesh in the groove work together to quickly discharge static electricity and avoid the accumulation of charge on the surface of the separator. The multi-layer ceramic coating combined with the lightweight design of the aluminum roller body improves wear resistance and is suitable for high-speed coating processes. The spiral groove guides the bidirectional flow of the slurry and improves the coating uniformity. Through the synergistic design of the composite conductive coating, the spiral groove and the dynamic tension control, the unity of anti-resistance and high wear resistance is achieved in the arc-shaped roller, which solves the problems of static control and processing accuracy in the production of lithium battery separators and is suitable for the large-scale production of high-end separators.

[0019] like Figure 3 As shown, in a preferred embodiment of this application, the roller body is a hollow roller body forged from 6061 aluminum alloy, and the surface is sandblasted to a roughness Ra of 2.5μm. The bottom layer 51 is a roughened metal connecting layer with a thickness of 2.5μm to enhance the adhesion between the bottom coating and the roller body surface. The middle layer 52 is a plasma-sprayed alumina ceramic coating with a thickness of 80μm to improve wear resistance. The surface layer 53 is an antistatic coating doped with conductive carbon nanotubes with a thickness of 15μm to reduce the surface resistance of the roller body.

[0020] The spiral groove 4 has an inverted trapezoidal cross-section and is microstructured by laser engraving. As a preferred embodiment of this application, the groove depth is 0.5 mm, the groove width is 3 mm, and the groove spacing is 20 mm. This enhances the uniformity of slurry flow and disperses static electricity accumulation, reduces missed coating and thick edge phenomena, and the coating uniformity can reach 95%.

[0021] The spiral groove 4 is embedded with a micro-conductive fiber mesh 6, which is connected to the surface layer 53 to form a static dissipation path.

[0022] The surface of the detachable shaft head 11 is covered with nitrile rubber to further suppress static electricity generation. After the detachable shaft head and magnetic powder clutch are installed, the overall dynamic balance calibration is performed.

[0023] Several points need to be clarified: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly, and can refer to mechanical or electrical connections, or internal connections between two components, or direct connections. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships, and the relative positional relationships may change when the absolute position of the described objects changes. Second, in this document, relational terms such as "first" and "second" are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities.

[0024] The above examples are merely illustrative of this utility model and do not constitute a limitation on the scope of protection of this utility model. All designs that are the same as or similar to this utility model are within the scope of protection of this utility model.

Claims

1. An arc roller for anti-resistance lithium battery separators, comprising a hollow aluminum arc roller body (1), characterized in that, The roller body (1) is provided with detachable shaft heads (11) at both ends, the surface of the detachable shaft heads (11) is provided with rotating bearings (2) embedded in the roller body (1), the other side of the rotating bearings (2) is connected with a rack, the outer side of the rotating bearings (2) is provided with a tension adjusting module (3) connected with an external controller, the surface of the roller body (1) is provided with a composite coating structure (5), the composite coating structure (5) comprises a bottom layer (51), an intermediate layer (52) and a surface layer (53) arranged in sequence from inside to outside on the surface of the roller body (1), and the roller body (1) is provided with helical grooves (4) along the circumferential direction of the roller surface.

2. An arc-shaped roller for anti-resistance lithium battery separators according to claim 1, characterized in that, The bottom layer (51) is a roughened metal connecting layer with a thickness of 0.5-3 μm.

3. An arc-shaped roller for anti-resistance lithium battery separators according to claim 1, characterized in that, The intermediate layer (52) is a plasma sprayed alumina ceramic coating with a thickness of 50-100 μm.

4. An arc-shaped roller for anti-resistance lithium battery separators according to claim 1, characterized in that, The surface layer (53) is an antistatic coating doped with conductive carbon nanotubes with a thickness of 10-20 μm.

5. An arc-shaped roller for anti-resistance lithium battery separators according to claim 1, characterized in that, The helical groove (4) has an inverted trapezoidal cross section, a groove depth of 0.3-0.7 mm, a groove width of 1-5 mm and a groove spacing of 10-30 mm.

6. An arc-shaped roller for anti-resistance lithium battery separators according to claim 5, characterized in that, The helical groove (4) is embedded with a micro conductive fiber mesh (6) to form an electrostatic dissipation path with the surface layer (53).

7. An arc-shaped roller for anti-resistance lithium battery separators according to claim 1, characterized in that, The surface of the detachable shaft head (11) is coated with neoprene.

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