Chamfering structure device for winding and cutting position

By using a winding and chamfering structure device for the cutting position, and employing upper and lower molds in conjunction with arc cutting, the problem of right-angle edge flanging after electrode cutting is solved, thereby improving the safety and processing quality of lithium-ion cells.

CN122425763APending Publication Date: 2026-07-21NANJING CBAK NEW ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING CBAK NEW ENERGY TECH CO LTD
Filing Date
2026-05-12
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

In the current lithium-ion battery cell winding manufacturing process, the electrode sheets are cut to form sharp right-angled edges, which leads to foil edge flipping problems, affecting the safety and yield of the battery cells, and interfering with subsequent processes.

Method used

The device employs a winding and cutting chamfering structure. Through the cooperation of upper and lower molds, a rounded chamfering cutting structure is formed, eliminating sharp right-angle edges and ensuring that the electrode sheet forms a regular quarter-circle end face after cutting.

Benefits of technology

It effectively prevents foil from flipping over, reduces the risk of short circuits inside the battery cell, improves processing stability and welding quality, and enhances product reliability and efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to the winding cutting technical field and discloses a winding cutting position chamfering structure device, which comprises a back plate and a lower die arranged on one side of the back plate; an upper die is arranged at the top end of the side wall of the back plate and is perpendicular to the back plate; a connecting plate edge is integrally formed on the side of the upper die away from the back plate along the width direction of the upper die; a pressing block is fixedly connected to the center position of the side of the connecting plate edge facing the lower die; an arc-shaped protrusion is integrally formed on the side of the pressing block facing the lower die along the length direction of the pressing block; and an arc-shaped groove corresponding to the arc-shaped protrusion is arranged on the lower die and is suitable for sliding and fitting of the arc-shaped protrusion. In the application, the pole piece is arranged between the upper die and the lower die; when the upper die is pressed down, the pressing block and the arc-shaped protrusion synchronously descend; a formed notch is pressed out at the corresponding position of the pole piece and shearing is completed, so that the pole piece forms a regular quarter circular arc end face after cutting, the right-angle sharp edge is eliminated in structure, and problems such as edge curling and warping of the cutting edge are avoided.
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