A soldering enhanced structure of a functional current collector and a copper foil and a method of manufacturing the same

By optimizing the welding tooth design and tin soldering riveting process, the problems of inconsistent perforation and insufficient welding strength during ultrasonic roll welding of functional current collectors and traditional current collectors have been solved, thereby improving the internal resistance stability and cycle life of the battery. This method is suitable for welding functional current collectors to copper foil in battery production.

CN122136581APending Publication Date: 2026-06-02YANGZHOU NANOPORE INNOVATIVE MATERIALS TECH LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YANGZHOU NANOPORE INNOVATIVE MATERIALS TECH LTD
Filing Date
2026-04-15
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

In the existing technology, the ultrasonic roll welding of functional current collectors and traditional current collectors has problems such as inconsistent perforation and insufficient welding strength, which leads to increased battery internal resistance and reduced cycle life.

Method used

By optimizing the welding tooth design and integrating the tin metal riveting process, and adopting a through-hole and tin solder riveting structure, combined with optimized ultrasonic roll welding parameters and contact resistance welding process, a riveting shape with "large at both ends and small in the middle" is formed to ensure the consistency of the through holes and the welding strength after welding.

Benefits of technology

The welding process achieves a uniform distribution of through holes, reduces battery internal resistance fluctuations, enhances welding strength, and improves battery electrical performance stability and cycle life, making it suitable for large-scale industrial production.

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Abstract

This invention discloses a welding reinforcement structure for a functional current collector and copper foil, and its preparation method, relating to the field of current collector technology. The welding reinforcement structure is used to connect the functional current collector and copper foil; the welding reinforcement structure includes a through-hole and a solder riveting structure; the through-hole penetrates the functional current collector and copper foil through solder teeth; the solder riveting structure consists of two layers of solder strips; the upper solder strip is disposed on the upper surface of the functional current collector, and the lower solder strip is disposed on the lower surface of the copper foil; the solder strip includes a PET support layer and small solder dots uniformly distributed inside the PET support layer, the small solder dots melting and being disposed within the through-hole. The functional current collector prepared by this invention exhibits good contact resistance, mechanical properties, and cycle stability.
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