Method and device for dividing raw roll

The hybrid double core laser system addresses the challenges of heat-induced performance degradation and spark generation in cutting electrode materials for lithium secondary batteries by using a high-intensity laser surrounded by a preheating laser and applying tension to the material during cutting, achieving accurate and high-speed cutting while minimizing heat impact.

JP7649582B1Active Publication Date: 2025-03-21O M C CO LTD
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Patent Information

Application Number
JP2024109586
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2024-07-08
Publication Date
2025-03-21
Estimated Expiration
2044-07-08

AI Technical Summary

Technical Problem

Existing methods for cutting electrode materials for lithium secondary batteries using laser beams, such as YAG lasers, result in heat-induced performance degradation of the active material layer and generate sparks and burrs, leading to battery failures.

Method used

A hybrid double core laser system is used to cut the electrode materials, where a high-intensity laser is surrounded by a preheating laser to minimize heat impact and suppress sputtering. The laser is applied in a pulse shape to form perforated holes, and a backup roller with tension is used to stabilize the material during cutting.

Benefits of technology

This method effectively minimizes heat influence on the active material layer, suppresses sputtering and burr formation, and allows for accurate and high-speed cutting of electrode materials, reducing the risk of battery failures.

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Abstract

This is a cutting method that uses a laser beam to achieve high speed, accurate cutting with minimal thermal effects. [Solution] This is a method for dividing a raw web 1 using a hybrid double-core laser L. The raw web 1, in which an active material layer 2 is applied to at least one surface of a long metal foil 4, is transported in one direction. A double-core laser L, which is composed of a high-intensity laser Lf at the center and a preheating laser Ly that surrounds the high-intensity laser Lf and has a lower intensity than the high-intensity laser Lf and preheats the periphery of the irradiation point P, is irradiated in pulses. Perforated holes 1h are formed in the raw web 1 in the longitudinal direction. Downstream away from the irradiation point P, the raw web 1 is torn vertically along the row of perforated holes 1h starting from the perforated holes 1h.
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