A laser cleaning method for pure silicon anode sheets

By adjusting the laser cleaning parameters and scanning direction, and using a low-energy laser cleaning method, the problems of residual silicon and severe deformation in the tab grooves during the laser cleaning of pure silicon anode sheets were solved, achieving a balance between cleanliness and deformation, and ensuring the battery's electrical performance.

CN122076765APending Publication Date: 2026-05-26SHENZHEN HIGHPOWER TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-31
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In the existing technology, laser cleaning of pure silicon anode sheets has problems such as residual silicon in the tab groove and severe deformation. In particular, the laser cleaning parameters of conventional graphite anodes are difficult to completely remove silicon from the surface of the anode current collector, resulting in severe deformation of the pure silicon anode sheet after cleaning.

Method used

At least two laser cleaning operations are performed using low-energy laser parameters, specifically a pulse frequency ≤220Hz, a laser power ≤35W, and a pulse width ≤140ns. The scanning direction is adjusted so that the scanning directions of the first and second laser cleaning operations are different. At the same time, at least three laser cleaning operations are performed on the second pure silicon material layer, and the scanning direction is adjusted to expose the part of the negative electrode current collector used for welding the electrode tab.

Benefits of technology

While ensuring the cleanliness of the tab groove, the deformation of the pure silicon negative electrode sheet is reduced, and damage caused by cleaning in the same direction is avoided. This ensures that there is no silicon residue in the tab groove and no ablation of the current collector in the groove, thereby improving the cleaning effect and maintaining the battery's electrical performance.

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Abstract

This application provides a laser cleaning method for a pure silicon negative electrode sheet. The pure silicon negative electrode sheet includes a negative electrode current collector and a first pure silicon material layer disposed on one side surface of the negative electrode current collector. The method includes the following steps: determining a first position to be cleaned in the first pure silicon material layer; performing at least two laser cleanings on the first pure silicon material layer at the first position to be cleaned to expose the portion of the negative electrode current collector used for welding tabs; the at least two laser cleanings include a first laser cleaning and a second laser cleaning performed sequentially, with different scanning directions for the first laser cleaning and the second laser cleaning; in the laser cleaning step, the laser parameters are: pulse frequency ≤ 220 Hz, laser power ≤ 35 W, and pulse width ≤ 140 ns. The laser cleaning method for a pure silicon negative electrode sheet provided by this application results in a clean tab groove with no silicon residue inside, no ablation of the current collector inside the groove, minimal deformation of the pure silicon negative electrode sheet, achieving a better cleaning effect without affecting the electrical performance of the battery.
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