Foil cutter structure

Abstract

The utility model discloses a foil cutter structure which comprises an upper cutter and a lower cutter, the upper cutter is located below the lower cutter, the gap between the upper cutter and the lower cutter is zero, the lower cutter is provided with a tool withdrawal groove, and the tool withdrawal groove is used for scraping waste on the upper cutter after foil cutting is completed. According to the utility model, the tool withdrawal groove is formed in the lower cutter, so that the contact surface of the upper cutter and the lower cutter is reduced, and the foil waste adhered to the upper cutter can be scraped when the upper cutter and the lower cutter are separated, so that the phenomenon that the foil waste is brought into a battery cell to cause scrapping is reduced, and the gap between the upper cutter and the lower cutter is changed from negative tolerance to zero gap; therefore, abrasion is reduced, and the service life of the upper cutter and the service life of the lower cutter are prolonged.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery processing technology, and in particular to a foil cutting structure. Background Technology

[0002] In the lithium-ion battery production process, electrode current collectors are assembled into a whole by ultrasonic welding. After being cut by a foil cutter, the current collectors are made to the required size. Then, the electrode tabs are welded to connect the current collectors, and the battery is then charged and discharged.

[0003] Currently, foil cutting is achieved using two upper and lower cutting blades that move relative to each other. When cutting the positive electrode tab of the battery cell, flat blades are used. Using flat blades presents the following problems: First, due to the numerous and thick layers of aluminum foil on the tab, the gap between the upper and lower cutting blades is adjusted to a negative tolerance each time the blade gap is adjusted, causing abnormal blade wear. Second, aluminum foil has good ductility and a low melting point; during cutting, stretching and friction easily cause it to stick to the cutting blade and be carried into the battery cell, resulting in foil debris and scrap. Third, there is no timely and effective detection method for foil debris during the welding process, which can flow into the packaging, causing poor sealing and scrapping. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a foil cutting structure.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A foil cutting blade structure includes an upper cutting blade and a lower cutting blade, wherein the upper cutting blade is located below the lower cutting blade, the gap between the upper cutting blade and the lower cutting blade is 0, and the lower cutting blade is provided with a blade retraction groove, which is used to scrape off the waste material on the upper cutting blade after the foil is cut.

[0007] In one embodiment, both the upper cutter and the lower cutter are made of TC material.

[0008] In one embodiment, the surfaces of both the upper and lower cutters are coated with a wear-resistant coating, which is a titanium nitride coating.

[0009] In one embodiment, the lower cutter has two retraction grooves, which are formed along the length of the lower cutter and are arranged in parallel in the vertical direction.

[0010] In one embodiment, the unloading groove has a length of 4 mm and a width of 0.5 mm.

[0011] In one embodiment, one side of the lower end of the upper cutter is flat, and the other side is set with a certain cutting edge angle. The flat side of the lower end of the upper cutter contacts one side of the lower cutter, and the side of the lower end of the upper cutter with a certain cutting edge angle is located on the side of the upper cutter away from the lower cutter.

[0012] In one embodiment, the cutting edge angle at the lower end of the upper cutter is 90°.

[0013] In one embodiment, the upper end of the lower cutter contacts the upper cutter on a flat surface, and the upper end of the lower cutter contacts the lower end of the upper cutter on a flat surface.

[0014] Compared with the prior art, the present invention has at least the following advantages:

[0015] This utility model discloses a foil cutting blade structure. By optimizing the materials of the upper and lower cutting blades, the wear resistance of the upper and lower cutting blades is increased. The lower cutting blade is provided with a blade retraction groove to reduce the contact area between the upper and lower cutting blades. When the upper and lower cutting blades separate, the foil waste adhering to the upper cutting blade can be scrapped off, thereby reducing the phenomenon of foil waste being brought into the battery cell and causing scrap. The gap between the upper and lower cutting blades is changed from negative tolerance to zero gap, thereby reducing wear and improving the service life of the upper and lower cutting blades. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0017] Figure 1 A cross-sectional structural diagram of a foil cutting blade structure provided by this utility model;

[0018] Figure 2 This is a schematic diagram of the lower cutter in a foil cutter structure provided by this utility model.

[0019] Figure descriptions: 10. Upper cutter; 20. Lower cutter; 21. Retractor groove. Detailed Implementation

[0020] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0021] A foil cutting blade structure, as shown in the figure Figure 1The system includes an upper cutter 10 and a lower cutter 20, with the upper cutter 10 positioned above the lower cutter 20. The upper cutter 10 and the lower cutter 20 can move relative to each other to cut the foil. The gap between the upper cutter 10 and the lower cutter 20 is zero. The lower cutter 20 is provided with a scraper groove 21, which can scrape off the waste material on the upper cutter 10 after the foil is cut.

[0022] Therefore, it should be noted that both the upper cutter 10 and the lower cutter 20 are fixed on the cutting device, which is existing technology and will not be described in detail in this embodiment. The foil to be cut is located between the upper cutter 10 and the lower cutter 20. The upper cutter 10 and the lower cutter 20 move relative to each other so that their opposite sides contact each other. The gap between the upper cutter 10 and the lower cutter 20 is zero to reduce wear and extend the service life of the upper cutter 10 and the lower cutter 20. The foil is cut during the downward movement of the upper cutter 10 and the upward movement of the lower cutter 20. The retraction groove 21 on the lower cutter 20 can scrape off the waste material to prevent it from sticking to the upper cutter 10 and being carried into the battery cell, causing it to be scrapped.

[0023] Furthermore, referring to Figure 1 Both the upper cutter 10 and the lower cutter 20 are made of TC material. TC material is a titanium alloy. The upper cutter 10 and the lower cutter 20 made of TC material have good strength, plasticity, fracture toughness and low crack propagation rate, so as to increase the wear resistance of the upper cutter 10 and the lower cutter 20 and reduce the wear of the upper cutter 10 and the lower cutter 20.

[0024] Furthermore, referring to Figure 1 The surfaces of the upper cutter 10 and the lower cutter 20 are coated with a wear-resistant coating, which is a titanium nitride coating. The titanium nitride coating can improve the wear resistance of the upper cutter 10 and the lower cutter 20, reduce the coefficient of friction, and reduce the adhesion between the upper cutter 10 and the lower cutter 20 and the waste.

[0025] In one embodiment, the wear-resistant coating may be a composite coating of titanium nitride and aluminum, which can further enhance the structural performance of the upper cutter 10 and the lower cutter 20.

[0026] Furthermore, referring to Figure 2 The lower cutter 20 has two retraction grooves 21, both of which are formed along the length of the lower cutter 20 and are arranged parallel to each other in the vertical direction. By providing two retraction grooves 21 on the lower cutter 20, the contact area between the upper cutter 10 and the lower cutter 20 is reduced. After the upper cutter 10 cuts the foil downwards and the lower cutter 20 cuts the foil upwards, the retraction grooves 21 can scrape off the foil waste adhering to the upper cutter 10 when the upper cutter 10 separates from the lower cutter 20, thereby reducing the phenomenon of foil waste being brought into the battery cell and causing scrap.

[0027] Furthermore, referring to Figure 2 The length of the relief groove 21 is 4mm and the width is 0.5mm.

[0028] Furthermore, referring to Figure 1 The lower end of the upper cutter 10 has a flat surface on one side and a certain cutting edge angle on the other side. The flat surface of the lower end of the upper cutter 10 contacts one side of the lower cutter 20, while the cutting edge angle of the lower end of the upper cutter 10 is located on the side of the upper cutter 10 away from the lower cutter 20.

[0029] Furthermore, referring to Figure 1 The cutting edge angle at the lower end of the upper cutter 10 is 90°. By setting a certain cutting edge angle at the position where the upper cutter 10 contacts the foil, the foil can be cut quickly while reducing the bending of the foil.

[0030] Furthermore, referring to Figure 1 The upper end of the lower cutter 20 is in contact with the upper cutter 10 on one side, which is a flat surface. The upper end of the lower cutter 20 is in contact with the lower end of the upper cutter 10 on one side, which is a flat surface.

[0031] This invention optimizes the materials of the upper cutter 10 and the lower cutter 20 to increase their wear resistance. The lower cutter 20 has a retraction groove 21 to reduce the contact area between the upper and lower cutters 10. When the upper and lower cutters 10 separate, the foil waste adhering to the upper cutter 10 can be scraped off, reducing the likelihood of foil waste being introduced into the battery cell and causing it to be scrapped. The gap between the upper cutter 10 and the lower cutter 20 is changed from a negative tolerance to a zero gap, thereby reducing wear and increasing the service life of both cutters 10 and 20.

[0032] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A foil cutter structure, characterized by, The utility model relates to a foil cutting device, including: The upper cutter (10) is located below the lower cutter (20), the gap between the upper cutter (10) and the lower cutter (20) is 0, the lower cutter (20) is equipped with a tool withdrawal groove (21), and the tool withdrawal groove (21) is used for scraping off waste on the upper cutter (10) after foil cutting is completed.

2. The knife structure for a foil material according to claim 1, wherein The upper cutter (10) and the lower cutter (20) are both made of TC material.

3. The knife structure for a foil material according to claim 1, wherein The surfaces of the upper cutter (10) and the lower cutter (20) are coated with a wear-resistant coating, which is a titanium nitride coating.

4. The knife structure for a foil material according to claim 1, wherein The tool withdrawal groove (21) on the lower cutter (20) has two, the two tool withdrawal grooves (21) are opened along the length direction of the lower cutter (20), and the two tool withdrawal grooves (21) are vertically arranged in parallel.

5. The foil cutter structure according to claim 4, wherein The length of the tool withdrawal groove (21) is 4mm, and the width is 0.5mm.

6. The foil cutter structure of claim 1, wherein One side of the lower end of the upper cutter (10) is a plane, and the other side is provided with a certain blade angle, one side of the lower end of the upper cutter (10) is in contact with one side of the lower cutter (20), and the other side of the lower end of the upper cutter (10) with a certain blade angle is located on the side away from the lower cutter (20).

7. The foil cutter structure according to claim 6, wherein The blade angle of the lower end of the upper cutter (10) is 90°.

8. The foil cutter structure according to claim 6, wherein One side of the upper end of the lower cutter (20) in contact with the upper cutter (10) is a plane, and the upper end of the lower cutter (20) is in contact with one side of the lower end of the upper cutter (10).

Images