An electrode piece defect detection and rejection mechanism and a rejection method thereof

Abstract

The application relates to a kind of pole piece bad detection rejection mechanism and its rejection method, including unwinding mechanism, brush dust removal mechanism, tension mechanism, dust sticking mechanism, buffer mechanism, detection mechanism, positioning mechanism, cutting mechanism, size detection mechanism and rejection mechanism, dust sticking mechanism is after cutting pole piece is dusted, detection mechanism detects pole lug and color mark and detects, positioning mechanism is positioned to pole lug and determines cutting position, cutting mechanism cuts pole piece material belt to form pole piece, size detection mechanism detects the size of pole piece, and rejection mechanism rejects unqualified pole piece.The above-mentioned pole piece bad detection rejection mechanism and its rejection method, through detection mechanism, position and yellow mark position of pole lug are detected on the same line, whether the pole piece is rejected is determined by algorithm, avoids the situation that pole piece is killed or is killed wrong, greatly increases the yield, combines detection mechanism and positioning mechanism to implement skip cutting function, slows down the wear of cutting knife, improves service life.

Description

Technical Field

[0001] This invention relates to the field of lithium battery production technology, and in particular to a defective electrode detection and rejection mechanism and method. Background Technology

[0002] In the manufacturing process of lithium batteries, when using a stacking machine to produce cells, one roll of positive electrode sheet, one roll of negative electrode sheet, and two rolls of separator are placed at different positions on the stacking machine. The stacking process sequentially piles the positive electrode sheet, separator, negative electrode sheet, and separator together to form a battery cell. To facilitate the identification of defects, defective electrode sheets are marked in yellow. When the winding machine detects a defective electrode sheet of a certain polarity, the entire cell containing that defective electrode sheet is scrapped. Since the entire cell is scrapped, discarding defective electrode sheets results in unnecessary waste. Summary of the Invention

[0003] The main objective of this invention is to provide a defective electrode detection and rejection mechanism and method to solve the above-mentioned technical problems and to automatically reject unqualified electrodes.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A defective electrode detection and rejection mechanism includes an unwinding mechanism, a brush dust removal mechanism, a tension mechanism, a dust adhesion mechanism, a buffer mechanism, a detection mechanism, a positioning mechanism, a cutting mechanism, a size detection mechanism, and a rejection mechanism. The unwinding mechanism unwinds the electrode strip; the brush dust removal mechanism removes dust from the electrode strip; the tension mechanism adjusts the tension of the electrode strip; the laser mechanism performs laser die-cutting of electrode tabs on the electrode strip; the dust adhesion mechanism adheres dust to the cut electrode; the buffer mechanism buffers the electrode strip; the detection mechanism detects the electrode tabs and color marks; the positioning mechanism photographs and positions the electrode tabs to determine the cutting position; the cutting mechanism cuts the electrode strip to form electrode sheets; the size detection mechanism detects the size of the electrode sheets; and the rejection mechanism rejects defective electrode sheets.

[0006] As a preferred technical solution, the unwinding mechanism includes an unwinding component, an adsorption roller component, and a deviation correction component. The unwinding component unwinds the electrode strip, the adsorption roller component flattens the electrode, and the deviation correction component corrects the deviation of the electrode strip.

[0007] As a preferred technical solution, the tension mechanism includes a swing arm assembly and a tension detection assembly, wherein the tension detection assembly detects the tension of the electrode strip, and the swing arm assembly adjusts the tension of the electrode strip.

[0008] The rejection mechanism includes a defect rejection component and an NG electrode collection box. The defect rejection component is a preferred technical solution, and defective electrodes are transported to the NG electrode collection box.

[0009] The present invention also provides another solution: a rejection method applied to the above-mentioned electrode defect detection and rejection mechanism, characterized by comprising the following steps:

[0010] S1. The positioning mechanism takes a picture of the electrode to determine the cutting position as A1;

[0011] S2, The detection mechanism detects color mark A2;

[0012] S3. Set the distance between the detection color mark position A2 and the end of the upper electrode to L1, the distance between the cutting position A1 and the end of the upper electrode to L2, the width of the color mark to L3, and the distance between the cutting position A1 and the detection color mark position A2 to △L.

[0013] S4. If △L>L3, then the electrode plate containing the tab is a substandard electrode plate and the electrode plate containing the tab is removed.

[0014] S5. If L3>|△L|>0, then the electrode plate containing the tab and the next electrode plate are unqualified electrodes, and the electrode plate containing the tab and the next electrode plate are removed.

[0015] S6. If △L < -L3, then the next electrode where the tab is located is a failing electrode and the next electrode where the tab is located is removed.

[0016] The beneficial effects of the present invention are as follows: The above-mentioned electrode defect detection and rejection mechanism and its rejection method have a simple structure, can be fixed by profile sheet metal, have a compact structure, and have a cost advantage. The detection mechanism detects and positions the electrode tab and the yellow mark on the same line, and the algorithm determines whether to reject the electrode. The calculation is accurate and error-free, avoiding over-rejection or wrong rejection of electrode, which greatly increases the yield rate. The combination of the detection mechanism and the positioning mechanism to implement the skip cutting function reduces the wear of the cutting blade and improves its service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the electrode defect detection and rejection mechanism involved in the present invention;

[0018] Figure 2 This is a schematic diagram of the electrode strip where the tabs need to be removed, as per the present invention.

[0019] Figure 3 This is a schematic diagram of the electrode strip that requires the removal of the tab and the next electrode strip, as per the present invention.

[0020] Figure 4This is a schematic diagram of the electrode strip that needs to be removed from the next electrode where the tab is located, as per the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] like Figure 1 As shown, a defective electrode detection and rejection mechanism includes an unwinding mechanism 1, a brush dust removal mechanism 2, a tension mechanism 3, a dust adhesion mechanism 4, a buffer mechanism 5, a detection mechanism 6, a positioning mechanism 7, a cutting mechanism 8, a size detection mechanism 9, and a rejection mechanism 10. The unwinding mechanism 1 unwinds the electrode strip, the brush dust removal mechanism 2 removes dust from the electrode strip, the tension mechanism 3 adjusts the tension of the electrode strip to ensure smoother electrode feeding, the laser mechanism performs laser die-cutting of electrode tabs on the electrode strip, the dust adhesion mechanism 4 applies dust to both sides of the cut electrode, the buffer mechanism 5 buffers the electrode strip, the detection mechanism 6 detects the electrode tabs and color marks, the positioning mechanism 7 photographs and positions the electrode tabs to determine the cutting position, the cutting mechanism 8 cuts the electrode strip to form an electrode, the size detection mechanism 9 detects the size of the electrode to determine whether the electrode is qualified, and the rejection mechanism 10 rejects unqualified electrode.

[0023] Specifically, the unwinding mechanism 1 includes an unwinding assembly 11, an adsorption roller assembly 12, a deviation correction assembly 13, an automatic exchange assembly 14, and a manual tape splicing assembly 15. The unwinding assembly 11 unwinds the electrode strip, the adsorption roller assembly 12 flattens the electrode, the deviation correction assembly 13 corrects the deviation of the electrode strip, the automatic exchange assembly 14 automatically exchanges the unwinding strip of the unwinding assembly 11 with the spare unwinding assembly, and the manual tape splicing assembly 15 allows for manual bonding of two sections of the strip together.

[0024] Specifically, the tension mechanism 3 includes a rocker arm assembly 31 and a tension detection assembly 32. The tension detection assembly 32 detects the tension of the electrode strip, and the rocker arm assembly 31 adjusts the tension of the electrode strip.

[0025] Specifically, the rejection mechanism 10 includes a defect rejection component 101 and an NG electrode collection box 102. The defect rejection component 101 transports defective electrodes to the NG electrode collection box 102.

[0026] A rejection method applied to the above-mentioned electrode defect detection and rejection mechanism includes the following steps:

[0027] Step 1: The positioning mechanism takes a picture of the electrode to determine the cutting position as A1;

[0028] Step 2: The testing agency determined the color mark to be A2.

[0029] Step 3: Set the distance between the detection color mark position A2 and the end of the upper electrode to L1, the distance between the cutting position A1 and the end of the upper electrode to L2, the width of the color mark to L3, and the distance between the cutting position A1 and the detection color mark position A2 to ΔL;

[0030] Step 4, as follows Figure 2 As shown, if △L>L3, then the electrode plate containing the tab is a substandard electrode plate and the electrode plate containing the tab is removed.

[0031] Step 5, as follows Figure 3 As shown, if L3>|△L|>0, then the electrode plate where the tab is located and the next electrode plate are unqualified electrodes, and the electrode plate where the tab is located and the next electrode plate are removed.

[0032] Step 6, as follows Figure 4 As shown, if △L < -L3, then the next electrode where the tab is located is a failing electrode and the next electrode where the tab is located is removed.

[0033] The embodiments described above are merely preferred examples of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention should be included within the scope of the present invention patent application.

Claims

1. A rejection method applied to an electrode defect detection and rejection mechanism, characterized in that, The defective electrode detection and rejection mechanism includes an unwinding mechanism, a brush dust removal mechanism, a tension mechanism, a dust adhesion mechanism, a buffer mechanism, a detection mechanism, a positioning mechanism, a cutting mechanism, a size detection mechanism, and a rejection mechanism. The unwinding mechanism unwinds the electrode strip; the brush dust removal mechanism removes dust from the electrode strip; the tension mechanism adjusts the tension of the electrode strip; the laser mechanism performs laser die-cutting of electrode tabs on the electrode strip; the dust adhesion mechanism adheres dust to the cut electrode; the buffer mechanism buffers the electrode strip; the detection mechanism detects the electrode tabs and color marks; the positioning mechanism photographs and positions the electrode tabs to determine the cutting position; the cutting mechanism cuts the electrode strip to form the electrode; the size detection mechanism detects the size of the electrode; and the rejection mechanism rejects defective electrode. The elimination method includes the following steps: S1. The positioning mechanism takes a picture of the electrode to determine the cutting position as A1; S2, The detection mechanism detects color mark A2; S3. Set the distance between the detection color mark position A2 and the end of the upper electrode to L1, the distance between the cutting position A1 and the end of the upper electrode to L2, the width of the color mark to L3, and the distance between the cutting position A1 and the detection color mark position A2 to △L. S4. If △L>L3, then the electrode plate containing the tab is a substandard electrode plate and the electrode plate containing the tab is removed. S5. If L3>|△L|>0, then the electrode plate containing the tab and the next electrode plate are unqualified electrodes, and the electrode plate containing the tab and the next electrode plate are removed. S6. If △L < -L3, then the next electrode where the tab is located is a failing electrode and the next electrode where the tab is located is removed.

2. The rejection method applied to the electrode defect detection and rejection mechanism according to claim 1, characterized in that, The unwinding mechanism includes an unwinding assembly, an adsorption roller assembly, and a deviation correction assembly. The unwinding assembly unwinds the electrode strip, the adsorption roller assembly flattens the electrode, and the deviation correction assembly corrects the deviation of the electrode strip.

3. The rejection method applied to the electrode defect detection and rejection mechanism according to claim 1, characterized in that, The tension mechanism includes a rocker arm assembly and a tension detection assembly. The tension detection assembly detects the tension of the electrode strip, and the rocker arm assembly adjusts the tension of the electrode strip.

4. The rejection method applied to the electrode defect detection and rejection mechanism according to claim 1, characterized in that, The rejection mechanism includes a defect rejection component and an NG electrode collection box. The defect rejection component transports defective electrodes to the NG electrode collection box.

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