Burr removing device for winding pole piece of sodium ion battery

Abstract

The utility model provides a sodium ion battery winding pole piece burr removing device which comprises a metal electrode, the tip end of the metal electrode directly faces burrs of a pole piece, and the metal electrode is connected with high voltage and used for generating point discharge sintering burrs. According to the utility model, the discharge of the electrode end is realized through the metal electrode, so that the burrs on the edge of the aluminum foil of the pole piece are electrically sintered and removed, the yield of the battery is improved, the safety of the product is improved, and the quality of the product is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of sodium ion battery production, in particular to a device for removing burrs from wound pole pieces of a sodium ion battery. Background Art

[0002] In the sodium-ion battery production process, the battery cell is the most important component. The battery cell is composed of multiple or single winding cores, which are formed by winding the die-cut positive and negative electrode sheets and separator. The performance of the battery cell has a direct impact on the performance of the battery, and the cell preparation process before battery assembly is very important. Among them, the die-cutting, slitting, and winding processes are essential to the manufacture of sodium-ion batteries and are key processes.

[0003] Die-cutting is the process of cutting the electrode sheets by laser to produce pole tabs of a certain shape and spacing; slitting is the process of cutting multiple pole sheets into single pieces by a slitting knife; due to the special properties of sodium in sodium-ion batteries, aluminum foil can be used as the negative electrode of the electrode tabs and current collector. Aluminum has the advantage of low cost over copper, and aluminum foil has high requirements on equipment capabilities during die-cutting. Burrs are easily generated due to problems such as dust in the laser chamber, differences in pole sheet thickness, and laser parameters; when the pole sheets are slitting, burrs are generated due to problems such as blade spacing, slitting knife gaps, and pole sheet jitter. The burr problem causes a large number of pole sheets to be scrapped, and there is also the risk of unscreened defective pole sheets flowing into the winding process, causing battery short circuits. Utility Model Content

[0004] In order to solve the above problems, the utility model aims to propose a burr removal device for a wound pole piece of a sodium ion battery, which realizes the discharge of the electrode extremes through the metal electrode, thereby electrically sintering and removing the burrs on the edge of the pole piece aluminum foil, thereby improving the yield of the battery, improving the safety of the product, and ensuring the quality of the product.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] A device for removing burrs from a wound pole piece of a sodium ion battery comprises a metal electrode, the tip of the metal electrode facing the burr of the pole piece, and the metal electrode is connected to a high voltage to generate tip discharge sintering burrs.

[0007] Furthermore, the metal electrode is a copper electrode, a nickel electrode or a gold electrode.

[0008] Furthermore, the metal electrode is in a cone or wheel shape.

[0009] Furthermore, a negative pressure environment box is included, the metal electrode is installed on the negative pressure environment box, and the negative pressure environment box is provided with an opening corresponding to the burr end of the electrode piece.

[0010] Furthermore, it also includes an insulating rubber pad, and the metal electrode is installed on the negative pressure environment box through the insulating rubber pad.

[0011] Furthermore, a purge pipe is provided on the top of the negative pressure environment box, and the air outlet end of the purge pipe faces the burr.

[0012] Furthermore, a negative pressure pipe is provided at the bottom of the negative pressure environment box.

[0013] Furthermore, the ventilation volume of the negative pressure pipe is greater than that of the purge pipe.

[0014] Beneficial effect: The utility model realizes the discharge of the electrode extremes through the metal electrode, thereby electrically sintering and removing the burrs on the edge of the pole piece aluminum foil, improving the yield of the battery, improving the safety of the product, and ensuring the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 This is a schematic structural diagram of a sodium ion battery wound electrode burr removal device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0018] Example 1

[0019] See also Figure 1 : A burr removal device for a wound pole piece of a sodium ion battery, comprising a metal electrode 1, the tip of the metal electrode 1 facing the burr 201 of the pole piece 2, and the metal electrode 1 connected to a high voltage to generate a tip discharge sintering burr 201.

[0020] In this embodiment, when voltage is applied through the metal electrode during the electrode tape running process, the metal electrode generates tip discharge, thereby electrically sintering the aluminum metal burrs of the electrode, reducing the electrode scrapping caused by the burr problem and improving the subsequent product yield.

[0021] In a specific implementation, the device of this embodiment can be compatible with being installed on a pole piece production line, for example: it is widely used on a winding machine to remove pole piece burrs.

[0022] In a specific example, the metal electrode 1 is a copper electrode, a nickel electrode, or a gold electrode.

[0023] The metal electrode of this embodiment can be made of a highly conductive material such as copper, nickel, or gold.

[0024] In a specific example, the metal electrode 1 is in a cone or wheel shape.

[0025] The conical or wheel-shaped metal electrode of this embodiment can make the top surface curvature large, which can greatly increase the electric field intensity, improve the tip discharge effect, and achieve a good sintering burr effect.

[0026] In a specific example, a negative pressure environment box 3 is further included. The metal electrode 1 is installed on the negative pressure environment box 3 . The negative pressure environment box 3 is provided with an opening 301 corresponding to the burr 201 end of the electrode 2 .

[0027] In this embodiment, the negative pressure environment box can absorb the burrs and foreign matter after sintering to prevent the foreign matter from falling on the surface of the electrode.

[0028] The negative pressure environment box of this embodiment can be made of steel or acrylic.

[0029] In a specific example, an insulating rubber pad 4 is further included, and the metal electrode 1 is installed on the negative pressure environment box 3 through the insulating rubber pad 4 .

[0030] The insulating rubber pad of this embodiment is located at the contact point between the negative pressure environment box and the metal electrode to prevent the negative pressure environment box from being electrified.

[0031] In a specific example, a purge pipe 302 is provided on the top of the negative pressure environment box 3 , and the air outlet end of the purge pipe 302 faces the burr 201 .

[0032] In this embodiment, foreign matter generated by the electric sintering process can be blown away from the electrode in a timely manner through the purge pipe, thereby preventing foreign matter from falling on the surface of the electrode.

[0033] In a specific example, a negative pressure pipe 303 is provided at the bottom of the negative pressure environment box 3 .

[0034] In this embodiment, the generated foreign matter can be promptly extracted through the negative pressure pipe to prevent the foreign matter from accumulating in the negative pressure environment box.

[0035] In a specific example, the ventilation volume of the negative pressure pipe 303 is greater than that of the purge pipe 302 .

[0036] The ventilation volume of the negative pressure duct in this embodiment is greater than that of the air blowing duct, thereby ensuring a negative pressure environment inside the box body.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for removing burrs from wound pole pieces of sodium ion batteries, characterized in that: It comprises a metal electrode (1), the tip of the metal electrode (1) faces the burr (201) of the electrode (2), and the metal electrode (1) is connected to a high voltage to generate the tip discharge sintering burr (201).

2. The sodium ion battery wound pole piece burr removal device according to claim 1, characterized in that: The metal electrode (1) is a copper electrode, a nickel electrode or a gold electrode.

3. The sodium ion battery wound pole piece burr removal device according to claim 1, characterized in that: The metal electrode (1) is in a cone or wheel shape.

4. The sodium ion battery wound pole piece burr removal device according to claim 1, characterized in that: It also includes a negative pressure environment box (3), the metal electrode (1) is mounted on the negative pressure environment box (3), and the negative pressure environment box (3) is provided with an opening (301) corresponding to the burr (201) end of the electrode (2).

5. The sodium ion battery wound pole piece burr removal device according to claim 4, characterized in that: It also includes an insulating rubber pad (4), and the metal electrode (1) is installed on the negative pressure environment box (3) through the insulating rubber pad (4).

6. The sodium ion battery wound pole piece burr removal device according to claim 4, characterized in that: A purge pipe (302) is provided on the top of the negative pressure environment box (3), the air outlet end of the purge pipe (302) faces the burr (201), and a negative pressure pipe (303) is provided on the bottom of the negative pressure environment box (3).

7. The sodium ion battery wound pole piece deburring device according to claim 6, characterized in that: The ventilation volume of the negative pressure pipe (303) is greater than that of the purge pipe (302).

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