阅读说明：本技术 纵切机 (Slitting machine ) 是由 尹悳重 宋沅俊 朴民修 于 2020-10-05 设计创作，主要内容包括：用于解决上述问题的根据本发明的实施方式的纵切机包括：上刀,所述上刀设置在电极板的上方以旋转,从而切割电极板；和下刀,所述下刀设置在电极板的下方,与上刀部分地重叠并旋转,从而与上刀一起切割所述电极板,其中所述上刀包括：第一内表面,所述第一内表面从形成在最下端的尖端倾斜地延伸至下刀；和外周表面,所述外周表面从尖端倾斜地延伸至与下刀相反的一侧,其中所述第一内表面具有与垂直线成第一角度的倾斜度,所述外周表面具有与垂直线成第二角度的倾斜度,所述垂直线垂直于作为上刀的旋转中心的旋转轴。(A slitting machine according to an embodiment of the present invention for solving the above problems includes: an upper knife disposed above the electrode plate to rotate, thereby cutting the electrode plate; and a lower cutter disposed below the electrode plate, partially overlapping the upper cutter and rotating to cut the electrode plate together with the upper cutter, wherein the upper cutter includes: a first inner surface extending obliquely from a tip formed at a lowermost end to the lower blade; and an outer peripheral surface extending obliquely from the tip to a side opposite to the lower blade, wherein the first inner surface has an inclination of a first angle from a vertical line perpendicular to a rotational axis as a rotational center of the upper blade, and the outer peripheral surface has an inclination of a second angle from the vertical line.)

1. A slitting machine comprising:

an upper knife disposed above the electrode plate to rotate, thereby cutting the electrode plate; and

a lower cutter disposed below the electrode plate, partially overlapping the upper cutter and rotating to cut the electrode plate together with the upper cutter,

wherein the upper knife comprises:

a first inner surface extending obliquely from a tip formed at a lowermost end to the lower blade; and

an outer peripheral surface extending obliquely from the tip to a side opposite to the lower blade,

wherein the first inner surface has a slope at a first angle to the vertical,

the outer peripheral surface has a slope at a second angle to the vertical,

the vertical line is perpendicular to a rotation axis that is a rotation center of the upper blade.

2. The slitter according to claim 1, wherein the first angle is in a range of 0.6 ° to 1.1 °.

3. The slitter according to claim 2, wherein the first angle is in a range of 0.9 ° to 1.0 °.

4. The slitter according to claim 1, wherein the second angle is in a range of 80 ° to 90 °.

5. The slitter according to claim 4, wherein the second angle is in a range of 85 ° to 90 °.

6. The slitter according to claim 1, wherein the upper knife further comprises a second inner surface extending inwardly from the first inner surface,

the second inner surface is inclined at a third angle from the vertical.

7. The slitter according to claim 6, wherein the third angle is in a range of 2.6 ° to 3.1 °.

8. The slitter according to claim 7, wherein the third angle is in a range of 2.8 ° to 3.0 °.

9. The slitter according to claim 6, wherein the upper blade and the lower blade are in line contact.

10. The slitter according to claim 1, wherein in the upper blade a horizontal distance from the tip to a contact point with the lower blade is in a range of 0.01mm to 0.5 mm.

11. The slitter according to claim 10, wherein in the upper blade a horizontal distance from the tip to a contact point with the lower blade is in a range of 0.1mm to 0.4 mm.

12. The slitting machine of claim 1, wherein the upper knife has a total thickness of 3mm to 5 mm.

13. The slitter according to claim 1, wherein in the upper knife, the tip first contacts the electrode plate.

14. The slitting machine according to claim 1, wherein in the lower blade, an outer peripheral surface on which the electrode plate is disposed is formed flat.

Technical Field

The present invention relates to a slitting machine, and more particularly, to a slitting machine capable of minimizing generation of foreign substances such as dust when cutting an electrode plate to manufacture an electrode, thereby reducing generation of defects of the electrode plate.

Background

In general, secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, lithium ion batteries, and lithium ion polymer batteries. Such secondary batteries have been applied to small-sized products such as digital cameras, P-DVDs, MP3P, mobile phones, PDAs, portable game devices, electric tools, electric bicycles, and the like, large-sized products requiring high power such as electric vehicles and hybrid vehicles, power storage devices for storing surplus power or renewable energy, and backup power storage devices.

To manufacture the electrode assembly, a cathode (hereinafter, referred to as a positive electrode), a separator, and an anode (hereinafter, referred to as a negative electrode) are manufactured and stacked. Specifically, when a positive electrode and a negative electrode are manufactured and then a separator is interposed between the manufactured positive and negative electrodes, a unit cell is formed. The unit cells may be stacked one on another to form an electrode assembly. Further, when the electrode assembly is accommodated in a specific case and an electrolyte is injected, a secondary battery is manufactured.

In order to manufacture electrodes such as a cathode and an anode, a coating process of applying a cathode active material slurry to a cathode current collector and applying an anode active material slurry to an anode current collector is first performed. Then, after the electrode plate is preheated, a rolling process of passing the electrode plate through a pair of rolls heated at a high temperature is performed. As a result, the capacity density of each electrode can be improved, and the adhesion between the electrode current collector and the slurry can be improved. When the rolling process is completed, a slitting process of cutting the electrode plate to a certain width using a slitting machine is performed. Thus, the electrode can be manufactured.

Generally, the slitting machine includes an upper blade disposed above the electrode plate and a lower blade disposed below the electrode plate. However, when the electrode plate is cut after curing the applied electrode active material slurry, foreign substances such as dust may be generated. Then, foreign substances such as dust are attached to the upper blade and the lower blade of the slitting machine. Therefore, when the electrode plate is cut using the slitter, defects may be generated.

[ Prior art documents ]

(patent document 1) Japanese patent laid-open publication No. 2006-

Disclosure of Invention

Technical problem

In order to solve the above problems, it is an object of the present invention to provide a slitter capable of minimizing generation of foreign substances such as dust when cutting an electrode plate to manufacture an electrode, thereby reducing generation of defects of the electrode plate.

The object of the present invention is not limited to the above object, and other objects not described herein will be clearly understood by those skilled in the art from the following description.

Technical scheme

In order to solve the above-described problems, a slitting machine according to an embodiment of the present invention includes: an upper knife disposed above the electrode plate to rotate, thereby cutting the electrode plate; and a lower cutter disposed below the electrode plate, partially overlapping the upper cutter and rotating to cut the electrode plate together with the upper cutter, wherein the upper cutter includes: a first inner surface extending obliquely from a tip formed at a lowermost end to the lower blade; and an outer peripheral surface extending obliquely from the tip to a side opposite to the lower blade, wherein the first inner surface has an inclination of a first angle from a vertical line perpendicular to a rotational axis as a rotational center of the upper blade, and the outer peripheral surface has an inclination of a second angle from the vertical line.

Further, the first angle may be in a range of 0.6 ° to 1.1 °.

Further, the first angle may be in a range of 0.9 ° to 1.0 °.

Further, the second angle may be in a range of 80 ° to 90 °.

Further, the second angle may be in a range of 85 ° to 90 °.

Additionally, the upper blade may further include a second inner surface extending inwardly from the first inner surface, wherein the second inner surface may be inclined at a third angle from vertical.

Further, the third angle may be in a range of 2.6 ° to 3.1 °.

Further, the third angle may be in a range of 2.8 ° to 3.0 °.

Further, the upper blade and the lower blade may be in line contact.

Further, in the upper blade, a horizontal distance from the tip to a contact point with the lower blade may be in a range of 0.01mm to 0.5 mm.

Further, in the upper blade, a horizontal distance from the tip to a contact point with the lower blade may be in a range of 0.1mm to 0.4 mm.

Further, the total thickness of the upper blade may be 3mm to 5 mm.

Further, in the upper blade, the tip may first come into contact with the electrode plate.

Further, in the lower cutter, the outer circumferential surface on which the electrode plate is disposed may be formed flat.

Details of other embodiments are included in the detailed description and the accompanying drawings.

Advantageous effects

According to the embodiments of the present invention, at least the following effects are obtained.

When the slitting machine cuts the electrode plate to manufacture the electrode, the upper blade may include a first inner surface extending obliquely from the tip end to the lower blade to minimize generation of foreign substances such as dust, thereby reducing generation of defects of the electrode plate.

Further, the upper blade may include a second inner surface extending inward from the first inner surface to reduce a contact area between the upper blade and the lower blade, thereby sharply cutting the electrode plate.

The effects of the present invention are not limited by the foregoing description, and therefore, more various effects are referred to in the present specification.

Drawings

Fig. 1 is a perspective view illustrating a state in which an electrode plate is cut by a slitter according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a slitting machine according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of an upper knife according to an embodiment of the present invention.

Fig. 4 is a cross-sectional view of a slitting machine according to another embodiment of the present invention.

Fig. 5 is a cross-sectional view of an upper knife according to another embodiment of the present invention.

Detailed Description

Advantages and features of the present invention and methods of accomplishing the same will be set forth in the following description of embodiments with reference to the accompanying drawings. This invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Furthermore, the invention is limited only by the scope of the claims. Like reference numerals refer to like elements throughout.

Unless the terms used in the present invention are defined differently, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. Furthermore, unless clearly and clearly defined in the specification, terms defined in a general dictionary should not be ideally or excessively interpreted to have formal meanings.

In the following description, technical terms are used to explain specific exemplary embodiments only, and do not limit the present invention. In this application, singular terms may include plural unless specifically mentioned. The meaning of "comprising" and/or "including" does not exclude other elements than those mentioned.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

Fig. 1 is a perspective view showing a state in which a slitting machine 1 cuts an electrode plate E according to an embodiment of the present invention.

To manufacture a secondary battery, a slurry in which an electrode active material, a binder, and a plasticizer are mixed with each other is applied to a positive electrode current collector and a negative electrode current collector to manufacture electrodes, such as a positive electrode and a negative electrode. Thereafter, electrodes are stacked on both sides of the separator, respectively, to form an electrode assembly having a predetermined shape. Then, the electrode assembly is inserted into a battery case, an electrolyte is injected, and sealing is performed.

The positive electrode and the negative electrode used in the present invention are not particularly limited, and the electrode active material may be prepared in a form of being bound to an electrode current collector according to a conventional method known in the art.

First, a coating process of applying a cathode active material slurry to a cathode current collector and applying an anode active material slurry to an anode current collector is performed. In the case of a lithium secondary battery, the positive electrode active material may include, for example, a layered compound such as lithium cobaltate (LiCoO)₂) And lithium nickelate (LiNiO)₂). In addition, the negative active material may include carbon, such as non-graphitizing carbon and graphite-based carbon, for example. In this case, the paste may further contain a conductive agent, a binder, a filler, and the like, if necessary.

When the coating process is completed, after preheating the manufactured electrode plate E, a rolling process of passing the electrode plate E between a pair of rolls heated at a high temperature is performed. As a result, the capacity density of each electrode can be improved, and the adhesion between the electrode current collector and the slurry can be improved. Here, the adhesiveness, the capacity density, and the like between the electrode collector and the slurry may be controlled by adjusting the distance between the rolls and the temperature and the rotation speed of each roll.

When the rolling process is completed, a slitting process of cutting the electrode plate E into a predetermined width by using the slitter 1 is performed. Thus, the electrode can be manufactured.

Fig. 2 is a sectional view of the slitting machine 1 according to the embodiment of the present invention, and fig. 3 is a sectional view of the upper blade 10 according to the embodiment of the present invention.

According to the embodiment of the present invention, when the electrode plate E is cut to manufacture the electrode, it is possible to minimize the generation of foreign substances such as dust, thereby reducing the generation of defects of the electrode plate E.

To this end, as shown in fig. 2 and 3, the slitting machine 1 according to the embodiment of the present invention includes: an upper cutter 10, the upper cutter 10 being disposed above the electrode plate E to rotate, thereby cutting the electrode plate E; and a lower cutter 11 disposed below the electrode plate E, partially overlapping the upper cutter 10 and rotating, thereby cutting the electrode plate E together with the upper cutter 10. The upper blade 10 includes: an inner surface 101, the inner surface 101 extending obliquely from a tip 102 formed at a lowermost end to the lower blade 11; and an outer peripheral surface 103, the outer peripheral surface 103 extending obliquely from the tip 102 to a side opposite to the lower blade 11. The inner surface 101 has a slope at a first angle a from a vertical line V perpendicular to the rotation axis R as the rotation center of the upper blade 10, and the outer peripheral surface 103 has a slope at a second angle b from the vertical line V. Further, the first angle a may be in the range of 0.6 ° to 1.1 °.

The upper cutter 10 is disposed above the electrode plate E to rotate together with the lower cutter 11, thereby cutting the electrode plate E. In order to cut an object as sharp as possible, in the general slitting machine 1, the tip 102 of the upper blade 10 is formed to be in close contact with the lower blade 11. Therefore, it is preferable that the inner surface 101 is not separately present on the upper blade 10. However, the electrode plate E has a shape in which an electrode active material slurry is applied to an electrode current collector. Therefore, after the electrode active material slurry is solidified, foreign substances such as dust are generated when the electrode plate E is cut using a general slitter 1. Further, foreign substances such as dust are attached to the upper blade 10 and the lower blade 11 of the slitter 1, and there is a problem that a defect is generated when the electrode plate E is cut again using the slitter 1.

In particular, in the case of the anode, the anode active material slurry applied has higher brittleness as compared to the cathode. Therefore, when the electrode plate E of the negative electrode is cut, there is a problem that more foreign substances such as dust are generated.

Therefore, according to the embodiment of the present invention, as shown in fig. 3, the upper blade 10 includes the inner surface 101, and the inner surface 101 extends obliquely from the tip 102 formed at the lowermost end to the lower blade 11. The inner surface 101 has a slope at a first angle a to a vertical line V perpendicular to the rotation axis R as the rotation center of the upper blade 10.

The upper blade 10 is generally formed in a disc shape having a constant thickness, and the center of the upper blade 10 is connected to the upper blade shaft 121. Further, the upper knife shaft 121 is connected to an upper knife driving motor (not shown), and when the upper knife driving motor rotates, a rotational force is transmitted to the upper knife 10 through the upper knife shaft 121. Thus, the upper blade 10 can rotate about the rotation axis R. The direction of rotation of the upper knife 10 is: a direction in which the tip 102 of the upper knife 10 cutting the electrode plate E is moved in the same manner as the electrode plate E. The total thickness d1 of the upper blade 10 is preferably in the range of 3mm to 5 mm.

The tip 102 of the upper cutter 10 is sharply formed at one end, particularly, the lowermost end, of the upper cutter 10 to directly cut the electrode plate E together with the lower cutter 11. When cutting of the electrode plate E is started, the electrode plate E is placed on the outer circumferential surface of the lower cutter 11 to move the electrode plate E, and then first comes into contact with the tip 102 of the upper cutter 10. Further, the electrode plate E is cut by friction between the upper blade 10 and the lower blade 11. According to the embodiment of the present invention, since the inner surface 101 is formed, the tip 102 of the upper blade 10 is not completely brought into close contact with the lower blade 11, but is formed to be spaced apart by a certain distance d 2.

As shown in fig. 3, a rotation axis R as a rotation center of the upper blade 10 is formed on the opposite side of the upper blade 10 from the tip 102. Preferably, the rotation axis R matches the central axis of the upper knife shaft 121 connected to the upper knife 10. Fig. 3 shows that the upper knife shaft 121 is omitted so that the rotation axis R is formed at the other end of the upper knife 10, but if the upper knife shaft 121 is present, the rotation axis R is formed to be spaced apart from the other end of the upper knife 10.

As shown in fig. 3, the inner surface 101 is formed to extend obliquely from the tip 102 of the upper blade 10 to the lower blade 11, and is inclined at a first angle a from the vertical line V. Here, the vertical line V is not a true line but a line conceptually shown in fig. 3 for convenience of explanation. The first angle a is preferably in the range of 0.6 ° to 1.1 °, and more preferably in the range of 0.9 ° to 1.0 °. If the first angle a is greater than 1.1 °, the electrode plate E may not be cut sharply, and if the first angle a is less than 0.6 °, the problem of generating foreign substances such as dust may still not be solved. Since the first angle a is very small, in the upper blade 10 according to the embodiment of the present invention, the tip 102 has a chamfered shape on the upper blade 10 of the general slitting machine 1.

Since the inner surface 101 is inclined at the first angle a, the tip 102 of the upper blade 10 is not completely brought into close contact with the lower blade 11, but is formed to be spaced apart by a certain distance d 2. Here, the specific distance d2 refers to a horizontal distance from the tip 102 of the upper blade 10 to the contact surface 104 with the lower blade 11. If the inner surface 101 is formed as a flat surface, the specific distance d2 may be a sine of the first angle a. According to an embodiment of the present invention, the specific distance d2 is preferably in the range of 0.01mm to 0.5mm, and more preferably in the range of 0.1mm to 0.4 mm. The distance of 0.5mm may be a very small distance, but as described above, since the total thickness d1 of the upper blade 10 is in the range of 3mm to 5mm, the distance may be a distance corresponding to about 10% to 15% of the total thickness d 1.

As shown in fig. 3, the support surface 105 refers to an outer surface of an outer wall of the upper blade 10 opposite to the lower blade 11. According to an embodiment of the present invention, the support surface 105 is formed to extend upward from the inner surface 101. The support surface 105 may be formed parallel to the vertical line V, but may be formed at a certain angle with respect to the vertical line V.

The outer peripheral surface 103 is formed to extend from the tip 102 of the upper blade 10 toward the side opposite to the lower blade 11. The outer peripheral surface 103 is much wider than the inner surface 101 and has a slope of a second angle b, which is a constant angle with respect to the vertical line V. The second angle b is preferably in the range of 80 ° to 90 °, and more preferably in the range of 85 ° to 90 °. If less than 80 °, there is a problem that the plastic strain rate at the cutting surface of the electrode plate E increases, and if more than 90 °, the outer circumferential surface 103 has a problem that it causes interference with the electrode plate E or the lower cutter 11.

The lower cutter 11 is disposed to partially overlap the upper cutter 10 below the electrode plate E and then rotated to cut the electrode plate E together with the upper cutter 10. The lower blade 11 is generally formed in a disc shape having a constant thickness, as with the upper blade 10, and the center of the lower blade 11 is connected to the lower blade shaft 122. Further, the lower blade shaft 122 is connected to a lower blade driving motor (not shown), and when the lower blade driving motor rotates, the rotational force is transmitted to the lower blade 11 through the lower blade shaft 122. Thus, the lower blade 11 can be rotated about a separate rotation shaft (not shown). The direction in which the lower blade 11 rotates is the opposite direction to the direction in which the upper blade 10 rotates.

Preferably, the outer circumferential surface 111 of the lower cutter 11 is formed flat in order to stably seat the electrode plate E. Further, the upper blade 10 and the lower blade 11 are disposed to partially overlap each other. As a result, the section of the electrode plate E cut by the upper and lower knives 10 and 11 may be clean and sharp.

In the upper blade 10 and the lower blade 11, an upper blade pad 131 and a lower blade pad 132 each having a predetermined width may be formed in the upper blade shaft 121 and the lower blade shaft 122, respectively. If the slitting machine 1 comprises a plurality of upper knives 10 and lower knives 11, the plurality of upper knives 10 may be spaced apart from each other and the plurality of lower knives 11 may be spaced apart from each other.

Fig. 4 is a sectional view of a slitting machine according to another embodiment of the present invention, and fig. 5 is a sectional view of an upper blade according to another embodiment of the present invention.

As shown in fig. 4 and 5, a slitting machine according to another embodiment of the present invention includes: an upper knife 10a, the upper knife 10a being disposed above the electrode plate E to rotate, thereby cutting the electrode plate E; and a lower cutter 11 disposed below the electrode plate E, partially overlapping the upper cutter 10a, to cut the electrode plate E together with the upper cutter 10 a. The upper blade 10a includes: a first inner surface 1011, the first inner surface 1011 extending obliquely from the tip 102 formed at the lowermost end to the lower blade 11; and an outer peripheral surface 103, the outer peripheral surface 103 extending obliquely from the tip 102 to a side opposite to the lower blade 11. The first inner surface 1011 has an inclination at a first angle a from the vertical line V perpendicular to the rotation axis R as the rotation center of the upper blade 10a, and the outer circumferential surface 103 has an inclination at a second angle b from the vertical line V. In addition, the upper blade 10a further includes a second inner surface 1012 extending inward from the first inner surface 1011, and the second inner surface 1012 is inclined at a third angle c from the vertical line V.

The first inner surface 1011 is formed to extend from the tip 102 of the upper blade 10a to the lower blade 11 and is inclined at a first angle a from a vertical line V perpendicular to the rotation axis R as the rotation center of the upper blade 10 a.

The second inner surface 1012 is formed to extend from the first inner surface 1011 toward the inner side of the upper blade 10 a. Further, the second inner surface 1012 has a slope at a third angle c to the vertical line V. As a result, as shown in fig. 4, the upper blade 10a and the lower blade 11 may be in contact with a line 104a or a very thin surface. Therefore, since the contact area is greatly reduced, even if the upper blade 10a and the lower blade 11 are rotated with the same rotational force, the shear stress applied to the electrode plate E is further increased. Therefore, the upper blade 10a and the lower blade 11 can cut the electrode plate E more cleanly and sharply. The third angle c is preferably in the range of 2.6 ° to 3.1 °, and more preferably in the range of 2.8 ° to 3.0 °. The second inner surface 1012 may extend toward the inner side of the upper blade 10a and then be stepped with respect to the support surface 105. However, the present invention is not limited thereto, and a separate curved surface may be formed to naturally connect the second inner surface 1012 to the support surface 105.

It will be appreciated by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are to be considered illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description and the exemplary embodiments described therein. Various modifications made within the scope of the claims of the present invention and their equivalents are considered to fall within the scope of the present invention.

[ description of symbols ]

1: slitting machine 10: upper knife

11: a lower cutter 101: inner surface

102: tip 103: outer peripheral surface

121: upper knife shaft 122: lower cutter shaft

131: upper blade pad 132: lower knife gasket

1011: first inner surface 1012: second inner surface