Lithium battery cell pole piece slitting knife

Abstract

The utility model discloses a lithium battery cell pole piece slitting knife, and belongs to the technical field of lithium battery slitting. The lithium battery cell pole piece slitting knife comprises a blade body and a cutting edge structure, the annular cutting edge structure is arranged on the outer ring of the blade body, the surfaces of the blade body and the cutting edge structure are coated with diamond-like carbon coatings, the blade body and the cutting edge structure comprise a main cutting edge and an auxiliary sleeking edge, and the main cutting edge and the auxiliary sleeking edge are in transition connection through an arc. According to the lithium battery cell pole piece slitting knife, the stepped cutting edge design of the main cutting edge and the auxiliary sleeking edge is adopted, segmented cutting is achieved, burrs are reduced, the flatness of a notch is improved, adhesion of a battery cell pole piece material is avoided through the diamond-like carbon coating, it is ensured that the slitting edge is smooth, meanwhile, the miniature heat conduction pipe and the heat dissipation groove are combined for heat dissipation, and the service life of the lithium battery cell pole piece slitting knife is prolonged. Efficient heat dissipation is achieved for the cutting edge structure, convection is enhanced through the heat dissipation micropores, passivation of the cutting edge structure caused by thermal deformation is prevented, and friction heat is reduced through the abrasion-resistant protruding points.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery slitting technology, and more specifically, to a lithium battery cell electrode slitting knife. Background Technology

[0002] Electrode slitting is a crucial step in lithium battery production, and its quality directly impacts battery performance. Traditional slitting blades are prone to wear, burrs, and material adhesion after prolonged use, resulting in uneven electrode cuts and even generating metal dust, affecting battery safety and consistency. Existing blades often employ a single-edge structure, which lacks sufficient wear resistance, leading to poor slitting results. Therefore, a new type of slitting blade is urgently needed to address these issues. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a lithium battery cell electrode slitting tool to solve the above-mentioned deficiencies.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] This utility model discloses a lithium battery cell electrode slitting tool, comprising a blade body and a cutting edge structure. The outer ring of the blade body is provided with an annular cutting edge structure. The surfaces of the blade body and the cutting edge structure are coated with a diamond-like carbon coating with a thickness of 2-5 μm and a hardness ≥2000 HV to reduce electrode material adhesion. The cutting edge structure adopts a multi-stage stepped cutting edge, including a main cutting edge and an auxiliary finishing edge. The main cutting edge and the auxiliary finishing edge are connected by an arc transition to form segmented cutting, reducing cutting resistance, reducing burrs, and improving cut smoothness. The blade body is embedded with a micro heat-conducting tube to absorb the heat of the cutting edge structure and achieve rapid heat diffusion through capillary action. The micro heat-conducting tube is made of copper-graphite composite material.

[0006] Preferably, the inner ring of the blade body has an installation port, and the side wall of the installation port has a positioning groove.

[0007] Preferably, a heat dissipation groove is provided on the blade body near the mounting port, and a micro heat-conducting tube is inserted through the heat dissipation groove.

[0008] Preferably, the heat dissipation grooves are distributed in concentric circles and are located in the non-working area of ​​the blade body, mainly in the clamping part, to avoid affecting the overall strength of the blade body. The heat dissipation grooves enhance convection heat dissipation by increasing the surface area. Heat dissipation micro-holes are opened on the outer wall of the blade body near the heat dissipation grooves to accelerate the heat diffusion in the heat dissipation grooves.

[0009] Preferably, wear-resistant protrusions are evenly spaced on the blade body near the auxiliary polishing blade. The wear-resistant protrusions have a hemispherical structure. During slitting, the wear-resistant protrusions reduce the contact area between the blade body and the battery cell electrode, thereby reducing frictional heat.

[0010] Preferably, the main cutting edge is connected to the blade body via an auxiliary finishing edge, the main cutting edge has an inclination angle of 15°-30°, and the auxiliary finishing edge has an inclination angle of 5°-10°.

[0011] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0012] This utility model discloses a lithium battery cell electrode slitting blade, which adopts a stepped cutting edge design with a main cutting edge and an auxiliary finishing edge to achieve segmented cutting, reduce burrs, and improve the flatness of the cut. The diamond-like carbon coating prevents the adhesion of battery cell electrode material and ensures smooth cutting edges. At the same time, it uses a combination of micro heat pipes and heat dissipation grooves to efficiently dissipate heat for the cutting edge structure. The heat dissipation micropores enhance convection and prevent the cutting edge structure from becoming dull due to thermal deformation. Wear-resistant bumps reduce frictional heat and further reduce heat accumulation. It can stably slit 6-20μm ultra-thin copper foil, aluminum foil, and coated electrode sheets. The mounting port and positioning groove ensure precise alignment of the blade and the blade body and avoid cutting deviation caused by vibration. Attached Figure Description

[0013] Figure 1 This is an overall structural diagram of the lithium battery cell electrode slitting blade of this utility model;

[0014] Figure 2 This is a cross-sectional view of the lithium battery cell electrode slitting blade of this utility model;

[0015] Figure 3 This is an enlarged view of point A in this utility model;

[0016] Figure 4 This is an enlarged view of section B of this utility model.

[0017] In the diagram: 1. Blade body; 11. Mounting port; 12. Positioning groove; 13. Heat dissipation groove; 14. Miniature heat pipe; 15. Heat dissipation micro-hole; 16. Wear-resistant protrusions; 2. Cutting edge structure; 21. Main cutting edge; 22. Auxiliary finishing edge. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] Combination Figures 1-4 This utility model discloses a lithium battery cell electrode slitting knife, which includes a blade body 1 and a cutting edge structure 2. The outer ring of the blade body 1 is provided with an annular cutting edge structure 2. The surfaces of the blade body 1 and the cutting edge structure 2 are coated with a diamond-like carbon coating with a thickness of 2-5μm and a hardness ≥2000HV to reduce the adhesion of electrode material.

[0021] Specifically, the inner ring of the blade body 1 has an installation port 11, the side wall of the installation port 11 has a positioning groove 12, the blade body 1 has a heat dissipation groove 13 near the installation port 11, a micro heat conduction tube 14 is inserted through the heat dissipation groove 13, the micro heat conduction tube 14 extends to a position near the cutting edge structure 2, the micro heat conduction tube 14 is made of copper-graphite composite material, the micro heat conduction tube 14 absorbs the heat of the cutting edge structure 2, and the heat is rapidly diffused by capillary action.

[0022] It should be noted that the heat dissipation grooves 13 are distributed in concentric circles. The heat dissipation grooves 13 are located in the non-working area of ​​the blade body 1, mainly in the clamping part, to avoid affecting the overall strength of the blade body 1. The heat dissipation grooves 13 enhance convection heat dissipation by increasing the surface area. Heat dissipation micro-holes 15 are opened on the outer wall of the blade body 1 near the heat dissipation grooves 13 to accelerate the heat diffusion in the heat dissipation grooves 13.

[0023] In this embodiment, the cutting edge structure 2 adopts a multi-stage stepped cutting edge, including a main cutting edge 21 and an auxiliary finishing edge 22. The two are connected by a circular arc transition to form a segmented cutting, which reduces cutting resistance, reduces burrs, and improves the flatness of the cut.

[0024] More specifically, the main cutting edge 21 is connected to the insert body 1 through the auxiliary finishing edge 22. The inclination angle of the main cutting edge 21 is 15°-30°, and the inclination angle of the auxiliary finishing edge 22 is 5°-10°.

[0025] In addition, in order to reduce frictional heat, wear-resistant protrusions 16 are provided at equal intervals on the blade body 1 near the auxiliary polishing blade 22. The wear-resistant protrusions 16 are hemispherical structures with a diameter of 0.5-1mm and a height of 0.1-0.2mm. During slitting, the wear-resistant protrusions 16 reduce the contact area between the blade body 1 and the battery cell electrode, thereby reducing frictional heat.

[0026] Working process: The battery cell electrode sheets pass through the slitting blade at a uniform speed under tension control. The main cutting edge 21 first cuts into the battery cell electrode sheet for rough cutting. The auxiliary finishing edge 22 then performs secondary finishing on the cut to remove burrs and ensure a smooth cut. The wear-resistant protrusions 16 reduce the contact area between the blade and the electrode sheet, reducing frictional heat accumulation. The heat generated during the slitting process is transferred to the blade body 1 through the cutting edge structure 2. The micro heat-conducting tube 14 uses capillary action to quickly absorb heat and diffuse it along the heat dissipation groove 13. The heat dissipation micropores 15 accelerate air convection and further improve heat dissipation efficiency. The diamond-like carbon coating reduces electrode material adhesion and prevents debris accumulation. The metal debris generated during slitting is promptly removed by centrifugal force or airflow blowing system to avoid secondary pollution.

[0027] 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.

[0028] 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 lithium battery cell electrode sheet slitting knife comprising a blade body (1) and a cutting edge structure (2), characterized in that, The outer ring of the blade body (1) is provided with an annular cutting edge structure (2). The blade body (1) and the cutting edge structure (2) are coated with diamond-like carbon coating. The cutting edge structure (2) includes a main cutting edge (21) and an auxiliary finishing edge (22). The main cutting edge (21) and the auxiliary finishing edge (22) are connected by an arc transition. The blade body (1) is embedded with a micro heat pipe (14).

2. The lithium battery cell electrode slitting blade according to claim 1, characterized in that, The inner ring of the blade body (1) is provided with an installation port (11), and a positioning groove (12) is provided on the side wall of the installation port (11).

3. The lithium battery cell electrode slitting blade according to claim 2, characterized in that, The blade body (1) has a heat dissipation groove (13) near the mounting port (11), and a miniature heat-conducting tube (14) is inserted through the heat dissipation groove (13).

4. The lithium battery cell electrode slitting blade according to claim 3, characterized in that, The heat dissipation grooves (13) are distributed in concentric circles. The heat dissipation grooves (13) are set in the non-working area of ​​the blade body (1). Heat dissipation micro-holes (15) are opened on the outer wall of the blade body (1) near the heat dissipation grooves (13) to accelerate the heat diffusion in the heat dissipation grooves (13).

5. The lithium battery cell electrode slitting blade according to claim 1, characterized in that, The blade body (1) is provided with wear-resistant protrusions (16) at equal intervals near the auxiliary polishing blade (22), and the wear-resistant protrusions (16) are hemispherical structures.

6. The lithium battery cell electrode slitting blade according to claim 1, characterized in that, The main cutting edge (21) is connected to the blade body (1) through the auxiliary finishing edge (22). The inclination angle of the main cutting edge (21) is 15°-30°, and the inclination angle of the auxiliary finishing edge (22) is 5°-10°.

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