Slitting upper knife and conductive metal film production device

Abstract

The utility model relates to a slitting upper knife, the outermost edge of at least one surface of the slitting upper knife is provided with a knife edge surface, the slitting upper knife is provided with a transition surface close to the knife edge surface, the inclination angle of the knife edge surface is larger than that of the transition surface, and the width of the knife edge surface is smaller than that of the transition surface. According to the upper slitting cutter, the transition face is arranged on the inner side of the outermost edge of the cutting edge face, the inclination angle of the cutting edge face is increased, the thickness of the cutting edge face is increased, and therefore the structural strength of the cutting edge face on the upper slitting cutter body is improved, and the hidden danger that the cutting edge face is broken is reduced; and the transition surface reduces the area of the blade surface, and the processing requirement and the processing cost of the blade surface are far higher than those of the transition surface, so that the manufacturing cost of the slitting upper knife is favorably reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of film slitting, in particular to a slitting upper knife and conductive metal film production device. BACKGROUND

[0002] Conductive metal film is a kind of material with multiple good properties, which has been widely used in batteries as positive current collector or negative current collector. The preparation process of conductive metal film includes film roughening, film electroplating and film slitting, etc. The film slitting process needs to use a slitting machine, which can cut a whole film into several small film strips of smaller size to meet the specific battery model and specifications.

[0003] A film slitting assembly has been developed in the industry, which installs the slitting upper knife and the slitting bottom knife on different knife shafts. The slitting upper knife and the slitting bottom knife rotate with the knife shafts. The slitting upper knife is located above the film, and the slitting bottom knife is located below the film. The outer edges of the two knives are staggered, that is, they have a certain amount of knife entry.

[0004] As disclosed in CN114713905A, a slitting upper knife and a slitting device include a first rotary knife (slitting upper knife) and a second rotary knife (slitting bottom knife). The first rotary knife has symmetrical first and second blade surfaces, and the two blade surfaces intersect to form a first knife edge. The blade surface of the slitting upper knife has a small inclination angle and a large extension area, which makes the first knife edge difficult to process and increases the processing cost. Moreover, the structure has low strength and is prone to brittle fracture, which shortens the service life of the slitting upper knife. UTILITY MODEL CONTENTS

[0005] To overcome the problem of the small inclination angle and large area of the blade surface of the existing slitting upper knife, which makes the processing difficult and increases the cost, and the low structural strength, the utility model provides a slitting upper knife and a conductive metal film production device.

[0006] The technical solution of the utility model is as follows:

[0007] A slitting upper knife has a blade surface on the outermost edge of at least one side. A transition surface is provided adjacent to the blade surface. The inclination angle of the blade surface is greater than that of the transition surface, and the width of the blade surface is less than that of the transition surface.

[0008] According to the utility model of the above-mentioned scheme, the outer edge of the single side of the slitting upper knife is sequentially provided with a blade surface and a transition surface from outside to inside, and the other side of the slitting upper knife is a plane.

[0009] According to the utility model of the above-mentioned scheme, the inclination angle of the blade surface ranges from 14 degrees to 40 degrees, and the inclination angle of the transition surface ranges from 8 degrees to 12 degrees.

[0010] According to the utility model, the width of the blade surface is 0.2mm to 0.4mm, and the width of the transition surface is 0.4mm to 1.5mm.

[0011] According to the utility model, the surface roughness of the blade surface is not more than 0.05 microns, and the surface roughness of the transition surface is not more than 0.1 microns.

[0012] Further, after the blade surface and the transition surface are removed from the slitting upper knife, the surface roughness of other regions is 0.2 microns.

[0013] Preferably, the thickness of the slitting upper knife is 0.3mm to 1mm.

[0014] Preferably, the vertical distance from the blade tip of the blade surface to the inner side of the transition surface is 3.5 to 6.5mm.

[0015] Preferably, the diameter of the slitting upper knife is 75mm to 140mm.

[0016] According to the utility model, the middle part of the slitting upper knife is provided with a mounting hole, the edge of the mounting hole is provided with a key groove, and the slitting upper knife is connected with the upper knife shaft through the key groove.

[0017] Further, the upper knife shaft is provided with a key hole, and the key hole is fixedly connected with the key groove through a key.

[0018] The utility model also provides a conductive metal film production device which comprises the slitting upper knife and an upper knife shaft for mounting the slitting upper knife.

[0019] According to the utility model, the conductive metal film production device further comprises a swing shaft, and a plurality of upper knife shafts are arranged on the swing shaft through rotating supports.

[0020] Further, the rotating support can slide on the swing shaft.

[0021] According to the utility model, the beneficial effects are as follows.

[0022] The slitting upper knife of the utility model is provided with a transition surface on the inner side of the outermost blade surface, the inclination angle of the blade surface is increased, the thickness of the blade surface is improved, the structural strength of the blade surface in the slitting upper knife body is improved, and the hidden danger of the blade surface breakage is reduced; and the transition surface reduces the area of the blade surface, and since the machining requirement and machining cost of the blade surface are much higher than those of the transition surface, the manufacturing cost of the slitting upper knife is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is structural schematic view of the embodiment one of the utility model;

[0024] Figure 2 It is half sectional view along the central axis of the slitting upper knife of the embodiment one;

[0025] Figure 3 It is Figure 2 The enlarged view of A part in the middle;

[0026] Figure 4 It is structural schematic view of the embodiment two of the utility model;

[0027] Figure 5 It is the connection schematic view of the slitting upper knife and the swing shaft in the conductive metal film production device;

[0028] Figure 6 It is the schematic view of the swing shaft driving the slitting upper knife movement;

[0029] Figure 7 It is the structural schematic view of the slitting upper knife and the slitting bottom knife in the conductive metal film production device;

[0030] Figure 8 It is the enlarged view of the cutting position of the slitting upper knife and the slitting bottom knife.

[0031] In the drawing,

[0032] 1, slitting upper knife;11, blade surface;12, transition surface;13, mounting hole;14, keyway;

[0033] 2, slitting bottom knife;

[0034] 3, lower knife shaft;31, support sleeve;

[0035] 4, upper knife shaft;41, speed reducer motor;42, rotating support;43, sliding block;44, swing shaft;

[0036] 5, conductive metal film. DETAILED DESCRIPTION

[0037] In order to better understand the purpose, technical scheme and technical effect of the utility model, the utility model is further explained and described below in combination with the drawings and embodiments. It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, it is declared that the following described embodiments are only for explaining the utility model, and are not used for limiting the utility model.

[0038] It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The term "multiple" means two or more, unless otherwise explicitly defined. The so-called slitting upper blade body in this utility model refers to the main body of the slitting upper blade after removing the blade edge and transition portion.

[0039] Example 1

[0040] like Figures 1 to 3 As shown, a slitting upper blade is provided with a blade surface 11 at the outermost edge of one side of the slitting upper blade 1, and a transition surface 12 is provided near the blade surface 11. The inclination angle of the blade surface 11 is greater than the inclination angle of the transition surface 12, and the width of the blade surface 11 is less than the width of the transition surface 12.

[0041] As can be seen, in this embodiment, the slitting blade 1 has a single-sided blade surface 11, consisting of a blade surface 11 and a transition surface 12 from the outside in. The other side of the slitting blade 1 is flat and does not have a blade surface 11. The slitting blade 1 is integrally formed. The transition surface 12 is first ground out on the edge of the slitting blade 1, and then the blade surface 11 is formed on the outermost edge. The outermost edge of the slitting blade 1 is the blade surface 11, and the adjacent blade surface 11 is the transition surface 12. The blade surface 11 and the transition surface 12 are located on the same side of the slitting blade 1.

[0042] By setting the transition surface 12, the transition connection between the blade surface 11 and the slitting upper blade body is realized, which improves the structural strength of the blade surface 11 in the slitting upper blade body and reduces the risk of blade surface 11 breakage. Moreover, the transition surface 12 reduces the area of ​​the blade surface 11. Since the processing requirements and processing costs of the blade surface 11 are much higher than those of the transition surface 12, it is beneficial to reduce the manufacturing cost of the slitting upper blade 1.

[0043] Furthermore, the slitting blade 1 of this invention is used to slit the conductive metal film 5, which is a plastic film with a metal layer, such as a copper layer, plated on its surface. During the slitting process, copper powder and copper slag will be generated and splashed, and the disorderly splashing will affect the flatness and smoothness of the conductive metal film 5 surface. However, the slitting blade 1 of this invention has a transition surface 12, which increases the tilt angle of the blade surface 11. This creates a downward tilting guide surface for the film, which can block and guide the metal powder and metal slag generated at the film plating during the cutting process, preventing dust from splashing back onto the conductive metal film 5.

[0044] In the utility model, the inclination angle a of the cutting edge 11 ranges from 14 degrees to 40 degrees; the inclination angle b of the transition surface 12 ranges from 8 degrees to 12 degrees. Specifically, taking the plane where the slitting upper cutter body is located as a reference surface, the acute angle between the cutting edge 11 and the reference surface is the inclination angle a of the cutting edge 11; similarly, the acute angle between the transition surface 12 and the reference surface is the inclination angle b of the transition surface 12. The inclination values of the cutting edge 11 and the transition surface 12 make the connection and transition of the cutting edge 11 and the slitting upper cutter body more reasonable, avoiding unnecessary extension of the cutting edge 11 (the unnecessary part of the cutting edge 11 refers to the part that does not work on the film cutting, and the existing slitting upper cutter 1 has a too large cutting edge 11, which inevitably has a part that does not work on the film cutting), while meeting the structural strength requirement of the conductive metal film slitting, effectively reducing the processing cost of the cutting edge 11, and having high economic efficiency.

[0045] The width of the cutting edge 11 ranges from 0.2 millimeters to 0.4 millimeters; the width of the transition surface 12 ranges from 0.4 millimeters to 1.5 millimeters.

[0046] The surface roughness of the cutting edge 11 is not more than 0.05 microns, and the surface roughness of the transition surface 12 is not more than 0.1 microns. After removing the cutting edge 11 and the transition surface 12, the surface roughness of the other areas of the slitting upper cutter 1 is 0.2 microns. Since the cutting edge 11 is the main surface for spinning the film, and the transition surface 12 may also contact the film cutting surface, the surface roughness of the cutting edge 11 and the transition surface 12 is relatively smaller than the roughness of the slitting upper cutter body, and the smaller the roughness, the more helpful it is to avoid the occurrence of wire drawing at the conductive metal film 5 cutting surface, and the wire drawing of the film will cause short circuit when applied to the battery. However, the smaller the surface roughness, the higher the processing requirement and the higher the processing cost, and the service life will also decrease. Therefore, after multiple tests and comparisons, the best range of the surface roughness of each part of the slitting upper cutter 1 is determined.

[0047] The thickness of the slitting upper cutter 1 ranges from 0.3 millimeters to 1 millimeter, which can meet the slitting precision requirement of the conductive metal film (the thickness of the general conductive metal film 5 is usually 4 to 20 microns), and also has sufficient slitting strength and durability. If the thickness of the slitting upper cutter body is too small, it is not easy to polish the cutting edge 11 and the transition surface 12, and the slitting strength and durability of the cutting edge will be poor; if the thickness of the slitting upper cutter body is too large, it will certainly take a lot of time and materials to polish it to the required cutting precision.

[0048] In an optional embodiment, the diameter of the slitting upper cutter 1 ranges from 75 millimeters to 140 millimeters. The vertical distance from the cutting tip of the cutting edge 11 to the inner side edge of the transition surface 12 ranges from 3.5 to 6.5 millimeters. The inner side edge of the transition surface 12 refers to the edge of the transition surface 12 close to the cutter core, and the vertical distance refers to the distance along the radial direction of the slitting upper cutter 1.

[0049] In the utility model, the middle part of the slitting upper cutter 1 is provided with a mounting hole 13, the edge of the mounting hole 13 is provided with a key groove 14, and the slitting upper cutter 1 is connected with the upper cutter shaft 4 through the key groove 14. Specifically, the upper cutter shaft 4 is provided with a key hole, and the key hole is fixedly connected with the key groove 14 through a flat key. The structure of the key connection in the embodiment can quickly and stably install the slitting upper cutter 1 at the upper cutter shaft 4, and the slitting upper cutter 1 is driven to rotate by driving the upper cutter shaft 4 to rotate, so that the film can be more stably rotary cut, and the cutting quality is guaranteed. The upper cutter shaft 4 can be an output shaft of the speed reducer motor 41 or can be in transmission connection with the output shaft of the speed reducer motor 41.

[0050] Embodiment two

[0051] As shown in Figure 4 , a slitting upper cutter, the remaining structure is same with embodiment one, the difference lies in: the double sides of the slitting upper cutter 1 are provided with the cutting edge surface 11 and the transition surface 12, and the outer edge of the slitting upper cutter 1 is sequentially provided with the cutting edge surface 11 and the transition surface 12 from outside to inside; the cutting edge surface 11 and the transition surface 12 on the same side are adjacent, and the cutting edge surface 11 and the transition surface 12 on the two sides are symmetrically arranged.

[0052] Embodiment three

[0053] As shown in Figure 7 , the utility model also provides a kind of conductive metal film production device, including slitting cutter, upper cutter shaft 4 and lower cutter shaft 3, slitting cutter includes slitting bottom cutter 2 and the slitting upper cutter 1 of above-mentioned embodiment, upper cutter shaft 4 is used to install slitting upper cutter 1, and lower cutter shaft 3 is used to install slitting bottom cutter 2.Each of upper cutter shaft 4 and lower cutter shaft 3 is connected with speed reducer motor, to realize that upper cutter shaft 4 drives slitting upper cutter 1 to rotate, and lower cutter shaft 3 drives slitting bottom cutter 2 to rotate.The linear velocity of slitting upper cutter 1 is equal to the linear velocity of slitting bottom cutter 2, sufficiently guarantee that conductive metal film keeps flat and stable when slitting, avoid that the film surface in the moving direction front of conductive metal film 5 and the film surface in the moving direction rear are extruded and generate wrinkle.

[0054] When slitting conductive metal film 5 (hereinafter referred to as film) using the device, the film moves along the circumferential surface of slitting bottom cutter 2, approaches slitting cutter, at the intersection position of slitting upper cutter 1 and slitting bottom cutter 2, slitting upper cutter 1 and slitting bottom cutter 2 are cooperated and cut the film by rotating.

[0055] As shown in Figure 5 and Figure 6 , in the embodiment, each slitting upper cutter 1 is connected with an upper cutter shaft 4, and an independent speed reducer motor 41 is configured, to form slitting upper cutter 1 group, and then a plurality of slitting upper cutter 1 groups are adjustably installed on the same swing shaft 44, specifically, refer to Figure 7The upper knife shaft 4 is rotatably connected with the rotating support 42 through a bearing, and the rotating support 42 is slidably connected with the swing shaft 44 through the sliding block 43, and the sliding block 43 can be fixed by tightening the bolt after adjusting the position of the sliding block 43. It can be seen that by adjusting the position of one sliding block 43 on the swing shaft 44, the positions of a group of slitting upper knives 1 can be adjusted.

[0056] As shown in Figure 6 Based on the above structure, the swing angle of the swing shaft 44 is controlled, that is, the distance between all slitting upper knives 1 and corresponding slitting bottom knives 2 is controlled, and the positions of all slitting upper knives 1 are quickly adjusted.

[0057] As shown in Figure 7 The lower knife shaft 3 is also sleeved with a support sleeve 31, and the cylindrical surface of the support sleeve 31 is used to support the film. When installed, the slitting bottom knife 2 is installed on the end face of the support sleeve 31, and the two are sleeved on the lower knife shaft 3, and the support sleeve 31 and the slitting bottom knife 2 are driven to rotate by the lower knife shaft 3. There is a gap between adjacent two support sleeves 31, and one slitting upper knife 1 is arranged in each gap, and the gap is the cutting position of the film.

[0058] In use, adjacent two support sleeves 31 support the left and right sides of the film slitting position respectively, the film passes above the support sleeve 31 and is supported by the support sleeve 31, so as to avoid the film from collapsing and affecting the slitting precision; at the gap between adjacent two support sleeves 31, the slitting upper knife 1 and the slitting upper knife 1 cooperate to slit the film.

[0059] The technical features of the above embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the description.

[0060] The above embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, on the premise of not departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A slitting upper knife characterized by, The outermost edge of at least one side of the slitting upper knife is provided with a cutting edge surface, and the slitting upper knife is provided with a transition surface adjacent to the cutting edge surface, the inclination angle of the cutting edge surface is greater than that of the transition surface, and the width of the cutting edge surface is less than that of the transition surface.

2. The slitting upper knife of claim 1, wherein, The outer edge of the single side of the slitting upper knife is sequentially provided with a cutting edge surface and a transition surface from outside to inside, and the other side of the slitting upper knife is a flat surface.

3. The slitting upper knife of claim 1 or 2, wherein, The inclination angle of the cutting edge surface ranges from 14 degrees to 40 degrees, and the inclination angle of the transition surface ranges from 8 degrees to 12 degrees.

4. The slitting upper knife of claim 3 wherein, The width of the cutting edge surface ranges from 0.2 mm to 0.4 mm, and the width of the transition surface ranges from 0.4 mm to 1.5 mm.

5. The slitting upper knife of any of claims 1, 2, or 4, wherein, The surface roughness of the cutting edge surface is not more than 0.05 microns, and the surface roughness of the transition surface is not more than 0.1 microns.

6. The slitting upper knife of claim 5 wherein, After the cutting edge surface and the transition surface of the slitting upper knife are removed, the surface roughness of other regions is 0.2 microns.

7. The slitting upper knife of any of claims 1, 2, 4, or 6, wherein, The middle part of the slitting upper knife is provided with a mounting hole, the edge of the mounting hole is provided with a key groove, and the slitting upper knife is connected with the upper knife shaft through the key groove.

8. The slitting upper knife of claim 1 wherein, The thickness of the slitting upper knife is 0.3 mm to 1 mm.

9. The slitter upper knife of claim 1, wherein, The vertical distance from the cutting edge of the cutting edge surface to the inner side of the transition surface is 3.5 to 6.5 mm.

10. An apparatus for producing a conductive metal thin film, characterized by comprising: The slitting upper knife according to any one of claims 1 to 9, and an upper knife shaft for mounting the slitting upper knife, wherein the upper knife shaft passes through the mounting hole of the slitting upper knife, and the upper knife shaft is connected with a speed reducer motor.

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