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Pole piece die cutting method and system

A pole piece, die-cutting technology, applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve the problem of high scrap rate, and achieve the effect of improving the yield rate, eliminating defects, and reducing the scrap rate of pole pieces

Active Publication Date: 2022-05-13
楚能新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of this method is that when the CCD picks out bad products, the pole piece has already been processed and cannot be reworked. When there is a defect, the entire pole piece will be scrapped. As the energy density of the current battery continues to increase, the length of the pole piece will also increase. The longer the pole piece is, the higher the scrap rate will be.

Method used

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  • Pole piece die cutting method and system
  • Pole piece die cutting method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] This embodiment provides a skip-cutting method in which a defect runs through both the first region and the second region of the pole piece.

[0075] The CCD is fixed in front of the processing station. Through the distance from the CCD detection station to the laser processing station and the defect coordinates in the pole piece coordinate system, the upper computer can calculate the distance S from the pole piece die-cutting station to the defect position. The belt speed is V. The upper computer outputs a control signal to the laser, so that the laser performs a straight-line cutting action after T=S / V seconds, and adjusts the defect area. like Figure 7 As shown, the cutting path is as follows:

[0076] The upper computer outputs the control signal → the laser executes the normal cutting cycle → (after T seconds) the laser executes the linear cutting command and cuts the fixed length S1 → Mark hole cutting, so the cutting of the current cycle is completed, and the ...

Embodiment 2

[0079] This embodiment provides a jump cut method in which the defect is only in the first area.

[0080] The CCD camera 1 is fixed in front of the processing station. Through the distance from the CCD detection station to the laser processing station and the defect coordinates in the pole piece coordinate system, the host computer can calculate the distance S from the pole piece die-cutting station to the defect position. The speed of the device is V. The upper computer outputs a control signal to the side laser corresponding to the first area, so that the side laser performs a straight line cutting action after T=S / V seconds, and adjusts the defect area. like Figure 8 As shown, the side cutting path is as follows:

[0081] The host computer outputs a control signal to the laser → the laser performs a normal cutting cycle → (after T seconds) the laser in the first area executes a straight line cutting command and cuts a fixed length S1, and the laser in the second area 2 e...

Embodiment 3

[0084] This embodiment provides a defect classification method, the method is as follows:

[0085] When a defect is detected, the type of the defect is determined according to the gray range of the defect, the area of ​​the defect, the diameter of the defect, and / or the width of the defect;

[0086] Make statistics on the types of defects and calculate the proportion of various defects;

[0087] According to the proportion of various defects, output the distribution map of defective products, such as Figure 9 shown.

[0088] More preferably, when the gray scale range of the defect is 90-120, and the area of ​​the defect is >0.5mm 2 , then the type of defect is judged as: metal leakage in the coating film area;

[0089] When the gray scale range of the defect is 90-120, and 0.2mm 2 2 , then it is judged that the type of defect is a scratch in the coating film area;

[0090] When the gray scale range of the defect is 190-220, and the defect area is >0.5mm 2 , then it is j...

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Abstract

The invention relates to the technical field of pole piece processing, in particular to a pole piece die cutting method and system. Comprising the steps of collecting an upstream pole piece image of a pole piece die cutting station; judging whether flaws exist in the pole piece or not according to the gray value of the pole piece image, and if flaws exist, analyzing flaw width information and flaw position information from the pole piece image; and when the laser is processed to the flaw position, the laser executes a linear cutting instruction until the linear cutting length reaches the flaw width, and then the laser continues to execute a normal cutting period. According to the method, the defects can be recognized in advance before the pole piece is processed, the defect area is automatically skipped, and the rejection rate of the pole piece is reduced.

Description

technical field [0001] The invention relates to the technical field of pole piece processing, in particular to a pole piece die-cutting method and system. Background technique [0002] In the lithium battery production process, the front-end pole piece production process consists of coating, rolling & pre-slitting, die-cutting & slitting. Among them, in the process of coating, rolling & pre-slitting, product defects such as pole piece foil leakage and pole piece cracking will occur. In order to improve the production yield and equipment utilization rate of this process, defective products will not be eliminated in this process. Instead, focus on the die-cutting & slitting process to identify defects through CCD defect detection and pick out defective pole pieces through marking. [0003] The logic of the general die-cutting process in the industry to pick out defective pole pieces is as follows: figure 1 As shown, after the pole piece is loaded, it enters the processing st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/38B23K26/03
CPCB23K26/38B23K26/032Y02E60/10
Inventor 付强矫贺东胡奇智钟祥龙张恒徐强董彪
Owner 楚能新能源股份有限公司
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