Low-resistance cutting circular blade for lithium batteries

Abstract

This utility model discloses a low-resistance lithium battery slitting circular cutter, belonging to the technical field of slitting circular cutter technology. The low-resistance lithium battery slitting circular cutter includes a cutter body and a cutting edge. The outer ring of the cutter body is integrally formed with the cutting edge. A spiral airflow groove is formed on the side wall of the cutter body, and a wavy cutting edge is provided on the cutting edge, which is coated with a gradient coating. The spiral airflow grooves are arranged in a ring at equal intervals, with 3-6 grooves. The surface roughness Ra within the spiral airflow grooves is ≤0.4μm. The low-resistance lithium battery slitting circular cutter of this utility model features a wavy cutting edge design that reduces the effective contact area. Combined with the air film and gradient coating, the overall cutting resistance is reduced, improving cutting efficiency. The spiral airflow grooves generate centrifugal airflow through high-speed rotation, which can remove more than 60% of the frictional heat, keeping the cutting edge temperature below 80℃ and avoiding material melting or adhesion problems caused by overheating. The tungsten carbide coating and the gradient coating work synergistically to significantly reduce surface energy.

Description

Technical Field

[0001] This utility model relates to the field of slitting circular blade technology, and more specifically, to a lithium battery slitting circular blade for low-resistance cutting. Background Technology

[0002] In the lithium battery production process, slitting is one of the key steps, typically using a circular cutter to slit the separator or electrode sheets. Traditional circular cutters suffer from several drawbacks: high cutting resistance leading to material deformation or burrs, affecting battery performance; metal foil or separator material easily adhering to the blade, reducing cutting accuracy; and frictional heat generated during high-speed cutting causing rapid tool wear and short lifespan. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and to provide a low-resistance cutting circular blade for lithium batteries, thereby solving the above-mentioned deficiencies.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows: a low-resistance cutting lithium battery slitting circular blade, comprising a blade body and a blade edge, wherein the outer ring of the blade body is integrally formed with the blade edge, a spiral airflow groove is provided on the side wall of the blade body, a wavy cutting edge is provided on the blade edge, and a gradient coating is applied to the blade edge.

[0005] Preferably, the spiral airflow channels are arranged in a ring at equal intervals, with 3-6 channels. The surface roughness Ra inside the spiral airflow channels is ≤0.4μm. During cutting, the spiral airflow channels generate centrifugal airflow through high-speed rotation, which carries away heat. The airflow throws particles away from the cutting area along the channel, reducing secondary adhesion. The high-speed airflow forms an air film between the slitting blade and the material, reducing cutting resistance. The end of the spiral airflow channels extends to the side of the blade near the blade body, directing the centrifugal airflow towards the cutting area for precise cooling.

[0006] Preferably, the blade thickness is 20-80μm, and it is mirror polished to reduce cutting resistance. The wavy blade edge includes peaks and troughs, with the peaks having a thickness of 20-50μm and the troughs gradually thickening to 50-80μm to form a gradient strength. The wavy design reduces the effective contact area by 30-50% compared to a flat blade, significantly reducing the stress per unit area.

[0007] Preferably, the gradient coating 22 includes a base layer, a working layer, and a surface layer. The working layer is disposed on the surface of the base layer and the base layer. The thickness of the base layer is 3μm to provide high adhesion. The thickness of the working layer is 2μm to provide a low coefficient of friction. A 0.1μm surface layer is embedded in the working layer to achieve self-lubrication function.

[0008] Preferably, the inner ring of the cutter body is provided with an integrally formed mounting ring. The mounting ring has a cutter shaft hole for connecting with the cutter shaft, and the mounting ring also has annularly distributed mounting holes. The cutter body is sleeved with the cutter shaft through the cutter shaft hole, and bolts pass through the mounting holes to fix the position of the mounting ring.

[0009] This invention relates to a low-resistance cutting circular blade for lithium batteries.

[0010] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0011] This invention relates to a low-resistance lithium battery slitting circular cutter. The wavy cutting edge design reduces the effective contact area, and combined with an air film and gradient coating, the overall cutting resistance is reduced, improving cutting efficiency. The spiral airflow groove generates centrifugal airflow through high-speed rotation, which can remove more than 60% of frictional heat, keeping the cutting edge temperature below 80℃ and preventing material melting or adhesion due to overheating. The tungsten carbide coating and gradient coating work synergistically to significantly reduce surface energy, effectively preventing metal foil or separator materials from adhering to the cutter surface. The high-speed airflow can quickly eject debris larger than 5μm from the cutting area, reducing secondary contamination and tool wear, and ensuring cutting quality. The wavy cutting edge adopts a thickness gradient design, with the peaks piercing first and the troughs unfolding later, achieving alternating "piercing-unfolding" cutting and avoiding the risk of material accumulation and blade chipping caused by continuous cutting. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the low-resistance cutting lithium battery slitting circular blade of this utility model;

[0013] Figure 2 This is an enlarged view of point A in this utility model;

[0014] Figure 3 This is a cross-sectional view of the low-resistance cutting circular blade for lithium batteries according to this utility model.

[0015] In the figure: 1. Tool body; 11. Spiral airflow groove; 2. Cutting edge; 21. Wavy cutting edge; 211. Wave crest; 212. Wave trough; 22. Gradient coating; 3. Mounting ring; 31. Tool shaft hole; 32. Mounting hole. Detailed Implementation

[0016] 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.

[0017] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0018] Combination Figures 1-3 This utility model discloses a low-resistance lithium battery slitting circular blade, comprising a blade body 1 and a blade edge 2. The blade body 1 is made of high-strength alloy steel substrate, with a tungsten carbide coating on the surface to improve hardness and wear resistance. The coating reduces surface energy and prevents the separator or metal foil from sticking together. The outer ring of the blade body 1 is integrally formed with the blade edge 2. Spiral airflow grooves 11 are formed on the side wall of the blade body 1. There are 3-6 spiral airflow grooves 11 arranged in a ring at equal intervals. The groove width is 0.8 mm and the depth is 0.5 mm. At the same time, the surface roughness Ra inside the spiral airflow grooves 11 is ≤0.4 μm. During cutting, the friction between the slitting circular blade and the material generates a high temperature of 100-300℃. The spiral airflow groove 11 forms a centrifugal airflow through high-speed rotation, which carries away more than 60% of the heat, keeping the blade temperature stable below 80℃. When slitting copper or aluminum foil, the airflow throws debris with a particle size >5μm away from the cutting area along the groove at a speed of 15-20m / s, reducing secondary adhesion. When cutting PE or PP diaphragms, it prevents the molten material from sticking to the groove wall. The high-speed airflow forms a 0.5-2μm air film between the slitting circular blade and the material, reducing the cutting resistance by 10-20%.

[0019] In addition, to improve the cooling effect, the end of the spiral airflow groove 11 extends to the side of the blade 2 near the blade body 1, which can direct the centrifugal airflow towards the cutting area for precise cooling.

[0020] In this embodiment, the blade 2 has a thickness of 20-80μm and is mirror-polished to reduce cutting resistance. The blade 2 is provided with a wavy cutting edge 21. The thickness of the cutting edge 21 is 20-50μm at the peak 211 and gradually increases to 50-80μm at the trough 212, forming a gradient strength. During operation, the peak 211 of the wavy cutting edge 21 contacts the material first, concentrating stress to achieve rapid piercing and reduce initial cutting resistance. As the tool rotates, the trough 212 unfolds the material, forming an alternating "piercing-unfolding" cutting process, avoiding material accumulation caused by continuous cutting. The wavy design reduces the effective contact area by 30-50% compared to a flat blade, significantly reducing the stress per unit area.

[0021] Specifically, the blade 2 is provided with a gradient coating 22, which includes a base layer, a working layer and a surface layer. The materials used for the base layer, working layer and surface layer are TiAlN, DLC and MoS2 nanoparticles, respectively. The TiAlN base layer has a thickness of 3μm to provide high adhesion. The DLC working layer has a thickness of 2μm to provide a low coefficient of friction. 0.1μm MoS2 nanoparticles are embedded in the DLC working layer to achieve self-lubrication.

[0022] It should be noted that the inner ring of the cutter body 1 is provided with an integrally formed mounting ring 3. The mounting ring 3 has a cutter shaft hole 31 for connecting with the cutter shaft, and the mounting ring 3 also has annularly distributed mounting holes 32. The cutter body 1 is sleeved with the cutter shaft through the cutter shaft hole 31, and the bolt passes through the mounting hole 32 to fix the position of the mounting ring 3.

[0023] Working process: During operation, the slitting circular blade is installed on the slitting machine's blade shaft, sleeved through the blade shaft hole 31 on the mounting ring 3, and fixed with bolts in the mounting hole 32. When the equipment is started, the circular blade rotates at high speed, and its blade 2 cuts materials such as copper foil, aluminum foil, or PE / PP diaphragm. The wavy cutting edge 21 of the blade 2 first quickly pierces the material with a thinner cutting edge at the crest 211, concentrating stress to achieve initial cutting. Subsequently, the trough 212 gradually unfolds the material, forming an alternating "piercing-unfolding" cutting pattern. At the same time, the spiral airflow groove 11 generates centrifugal force with the high-speed rotation of the blade, guiding the airflow along the groove and forming a high-speed airflow, throwing the cutting debris out of the cutting area to prevent secondary adhesion. In a high-temperature environment, the spiral airflow groove 11 effectively removes more than 60% of the heat, keeping the temperature of the cutting edge area stable below 80℃, preventing the diaphragm from melting and sticking. The end of the spiral airflow groove 11 extends to the root of the blade 2, ensuring that the cooling airflow accurately covers the cutting area and improves heat dissipation efficiency.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A low-resistance lithium battery slitting circular cutter, comprising a cutter body (1) and a cutting edge (2), characterized in that, The outer ring of the blade body (1) is integrally formed with the blade (2). The side wall of the blade body (1) is provided with a spiral airflow groove (11), the blade (2) is provided with a wave-shaped cutting edge (21), and the blade (2) is coated with a gradient coating (22).

2. The low-resistance cutting circular blade for lithium batteries according to claim 1, characterized in that, The spiral airflow grooves (11) are arranged in a ring at equal intervals, with 3-6 grooves. The surface roughness Ra of the spiral airflow grooves (11) is ≤0.4μm. The end of the spiral airflow grooves (11) extends to the side of the blade (2) near the blade body (1).

3. The low-resistance cutting circular blade for lithium batteries according to claim 1, characterized in that, The blade (2) has a thickness of 20-80 μm, and the wavy edge (21) includes a peak (211) and a trough (212). The peak (211) has a thickness of 20-50 μm, and the trough (212) gradually thickens to 50-80 μm.

4. The low-resistance cutting circular blade for lithium batteries according to claim 1, characterized in that, The gradient coating (22) includes a base layer, a working layer and a surface layer. The working layer is provided on the surface of the base layer and the base layer. The thickness of the base layer is 3μm and the thickness of the working layer is 2μm. A 0.1μm surface layer is embedded on the working layer.

5. The low-resistance cutting circular blade for lithium batteries according to claim 1, characterized in that, The inner ring of the cutter body (1) is provided with an integrally formed mounting ring (3), and the mounting ring (3) is provided with a cutter shaft hole (31) connected to the cutter shaft, and the mounting ring (3) is provided with annularly distributed mounting holes (32).

Images