Method for quality control of lithium battery aluminum foil edges

Abstract

This invention provides a method for controlling the edge quality of lithium battery aluminum foil, belonging to the technical field of aluminum foil edge quality control. The method includes the following steps: cutting the finished aluminum foil using a cutting tool; adding alcohol to the cutting tool as a lubricant at fixed intervals; replacing the cutting tool at fixed intervals; taking edge samples from each batch of aluminum foil for high-magnification analysis; and confirming improved edge quality by observing the edge cutting quality over the same distance. This invention effectively controls the edge quality of the cut aluminum foil by controlling the alcohol dosing speed, ensuring the tool rotates only clockwise, and replacing the cutting tool when the length of the cut aluminum foil is less than or equal to 50,000 meters. The notch width at the aluminum foil edge is 16.094 μm smaller than the traditional depth, significantly improving the edge quality of the cut aluminum foil.

Description

Technical Field

[0001] This invention relates to the field of aluminum foil edge quality control technology, and more particularly to a method for quality control of lithium battery aluminum foil edges. Background Technology

[0002] In the production process of existing aluminum foil die-cutting machines, due to the adhesion between the die-cutting blade and the aluminum foil, the aluminum foil is prone to burrs as it is lifted by the die-cutting blade. The rectangular aluminum foil sheets cut by the existing die-cutting blade are very easy to get stuck inside the blade, requiring the machine to be stopped and the aluminum foil sheets to be removed before production can continue. At the same time, during the transfer of rectangular aluminum foil sheets, the aluminum foil is relatively soft, making the edges of the aluminum foil very easy to be damaged during unloading, which affects the subsequent use of the aluminum foil.

[0003] Currently, the quality of foil edge cutting is directly related to the breakage of foil during use, necessitating improvements in edge cutting quality. To address this, a lithium battery-based method for controlling edge quality was designed, which improves edge cutting quality by controlling the tool's usage cycle. Summary of the Invention

[0004] The purpose of this invention is to provide a method for controlling the edge quality of lithium battery aluminum foil, thereby solving the technical problem that the existing foil cutting quality has defects that affect its use.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for quality control of the edges of aluminum foil used in lithium batteries, the method comprising the following steps:

[0007] Step 1: Use a knife to cut the finished aluminum foil product;

[0008] Step 2: At fixed intervals, add drops of alcohol to the cutting tool as a lubricant;

[0009] Step 3: Replace the cutting tool at fixed intervals;

[0010] Step 4: Take edge samples from each batch of aluminum foil for high-magnification analysis. By observing the edge cutting quality at the same distance, it is confirmed that the edge quality of the aluminum foil has improved.

[0011] Furthermore, in step 1, the cutting tool is a disc cutter. The automatic production line drives the finished aluminum foil through automatically, and the disc cutter rotates clockwise to cut the finished aluminum foil that has passed through. The disc cutter cannot rotate counterclockwise.

[0012] Furthermore, in step 2, the alcohol titration speed is set by using a dropper to titrate alcohol of varying purity as a tool lubricant.

[0013] Furthermore, in step 2, the dropper should be replaced regularly to prevent aging.

[0014] Furthermore, in step 3, the tool replacement cycle is when the length of the aluminum foil cut by the tool is less than or equal to 50,000 meters.

[0015] Further, the specific process in step 4 is as follows: a new set of cutting tools is used for a service life test. The tool test produces 6 batches of finished rolls, totaling 70,000 meters. A full inspection of the edge-cutting quality is conducted. Using a high-powered microscope at 500x magnification, the change in edge quality from the first batch to the last batch is observed. On the same equipment, cutting foil of the same thickness, edge samples are taken from each batch for high-powered analysis. By observing the edge-cutting quality over the same distance, it is found that in the finished product rolls from 13,000 to 49,000 meters (i.e., the first to the fourth batch), the edge notches are rectangular, with no V-shaped notches observed. The edge-cutting quality is relatively smooth, with a maximum notch depth of 4.157 μm. The notch width is 44.199μm. The finished product length is 61,000-70,000 meters, which is the fifth to sixth cut after the tool change. The edge notch is rectangular, with some V-shaped notches. The notches increase in number and their width decreases. The maximum notch depth is 3.976μm, and the maximum notch width is 28.105μm. Analyzing the notch depth, there is little difference between 13,000-70,000 meters. However, analyzing the notch width, the difference between 13,000-49,000 meters and 61,000-70,000 meters is 16.094μm. Therefore, the smaller the notch width, the worse the edge cutting quality. When cutting aluminum foil, if the length is less than 50,000 meters, the cutting tool should be changed to improve the edge quality of the aluminum foil.

[0016] The present invention, by adopting the above-described technical solution, has the following beneficial effects:

[0017] This invention effectively controls the edge quality of the cut aluminum foil by controlling the alcohol titration speed, controlling the tool to rotate only clockwise, and replacing the cutting tool when the length of the cut aluminum foil is less than 50,000 meters. The notch width at the edge of the aluminum foil is 16.094 μm smaller than the traditional depth, which greatly improves the edge quality of the cut aluminum foil. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, preferred embodiments are described below to further illustrate the invention in detail. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of the invention, and these aspects can be achieved even without these specific details.

[0019] A method for quality control of the edges of aluminum foil used in lithium batteries, the method comprising the following steps:

[0020] Step 1: Use a cutting tool to cut the finished aluminum foil. The cutting tool is a disc cutter. The automated production line automatically drives the finished aluminum foil through, and the disc cutter rotates clockwise to cut the foil. Counter-clockwise rotation of the disc cutter is prohibited. The cutter shaft usually rotates clockwise; counter-clockwise rotation can cause defects such as edge defects.

[0021] Step 2: Apply alcohol to the cutting tool at fixed intervals as a lubricant. Use a dropper to dispense pure alcohol as a lubricant, setting the alcohol dispensing speed. Replace the dropper regularly to prevent aging and affecting the quality of the cut edges.

[0022] The speed of alcohol titration: If the alcohol is titrated too fast, it will cause unevenness on the end face, resulting in a mark-like defect. If the alcohol is titrated too slowly or not at all, it will cause poor edge quality defects. Under strong light, obvious aluminum shavings can be seen on the end face. Moreover, if the alcohol is not titrated, the end face will have a color difference.

[0023] Step 3: Replace the cutting tools at fixed intervals. The cutting tools should be replaced with a new set when the length of aluminum foil cut by the tool is less than or equal to 50,000 meters. Prolonged use of the cutting tools will significantly impact the quality of the cut edges.

[0024] Step 4: Take edge samples from each batch of aluminum foil for high-magnification analysis. By observing the edge cutting quality at the same distance, it is confirmed that the edge quality of the aluminum foil has improved.

[0025] Validation: A service life test was conducted on the currently used cutting tool. This tool produced six batches of finished coils, totaling 70,000 meters. The edge-cutting quality was fully inspected, and the changes in edge quality from the first to the last batch were observed under a high-powered microscope at 500x magnification. Using the same equipment to cut foil of the same thickness, edge samples were taken from each batch for high-powered analysis. By observing the edge-cutting quality over the same distance, it was found that from 13,000-49,000 meters (the first to fourth batches after the tool change), the edge notches were rectangular, with no V-shaped notches, and the edge-cutting quality was relatively smooth with few notches. The maximum notch depth was 4.157μm, and the maximum notch width was 44.199μm. From 61,000-70,000 meters (the fifth to sixth batches after the tool change), the edge notches... The notches are rectangular, with occasional V-shaped notches. The edge cutting quality gradually deteriorates, with more and more notches appearing and their width decreasing. The maximum notch depth is 3.976 μm, and the maximum notch width is 28.105 μm. Analyzing the notch depth, there is little difference between 13,000-70,000 meters. However, analyzing the notch width, the difference between 13,000-49,000 meters and 61,000-70,000 meters is 16.094 μm. Therefore, the smaller the notch width, the worse the edge cutting quality. This method can effectively improve the quality of aluminum foil edge cutting.

[0026] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for quality control of the edges of lithium battery aluminum foil, characterized in that: The method includes the following steps: Step 1: Use a knife to cut the finished aluminum foil product; Step 2: At fixed intervals, add drops of alcohol to the cutting tool as a lubricant; Step 3: Replace the cutting tool at fixed intervals; Step 4: Take edge samples from each batch of aluminum foil for high-magnification analysis. By observing the edge cutting quality at the same distance, it is confirmed that the edge quality of the aluminum foil has improved. In step 1, the cutting tool is a disc cutter. The automatic production line drives the finished aluminum foil through automatically. The disc cutter rotates clockwise to cut the finished aluminum foil. The disc cutter cannot rotate counterclockwise. In step 3, the replacement cycle for the cutting tool is when the length of the aluminum foil cut by the tool is less than or equal to 50,000 meters, a new cutting tool should be replaced. Step 4 involves a service life test using a brand-new cutting tool. The test produced six batches of finished rolls, totaling 70,000 meters. A full inspection of the edge-cutting quality was conducted. Using a high-powered microscope at 500x magnification, the changes in edge quality from the first to the last batch were observed. On the same equipment, cutting foil of the same thickness, edge samples were taken from each batch for high-powered analysis. By observing the edge-cutting quality over the same distance, it was found that from 13,000 to 49,000 meters (the first to fourth batches), the edge notches were rectangular, with no V-shaped notches observed. The edge-cutting quality was relatively smooth, with a maximum notch depth of 4.157 μm and a maximum notch width of [missing information]. The thickness is 44.199μm. The finished product length is 61,000-70,000 meters, which is the fifth to sixth cut after the tool change. The edge notch is rectangular, with some V-shaped notches. The notches are increasing in number and the width is decreasing. The maximum notch depth is 3.976μm and the maximum notch width is 28.105μm. Analyzing the notch depth, there is little difference between 13,000-70,000 meters. Analyzing the notch width, the difference between 13,000-49,000 meters and 61,000-70,000 meters is 16.094μm. Therefore, the smaller the notch width, the worse the edge cutting quality. When cutting aluminum foil, if the length is less than or equal to 50,000 meters, the tool should be changed to improve the edge quality of the aluminum foil.

2. The method for quality control of the edge of lithium battery aluminum foil according to claim 1, characterized in that: In step 2, 99.9% pure alcohol is used as a tool lubricant by titrating with a dropper at a rate of 0.05 ml / second.

3. The method for quality control of the edge of lithium battery aluminum foil according to claim 2, characterized in that: In step 2, the dropper should be replaced regularly to prevent aging. The dropper should be replaced every 8-12 months.