Slit die coater and secondary battery electrode

By designing a slot die coating machine, a barrier layer is formed by the overlap of a high-viscosity slurry with the edge of the first slurry, which solves the problem of slurry slippage during the coating process of secondary battery electrodes, thereby improving the uniformity of electrode thickness and battery safety.

CN122141906APending Publication Date: 2026-06-05SAMSUNG SDI CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SAMSUNG SDI CO LTD
Filing Date
2025-11-25
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

In the prior art, the coating process of secondary battery electrodes is subject to slurry edge slippage, resulting in uneven electrode thickness, which may lead to electrode quality deterioration and the risk of short circuit or fire in the secondary battery.

Method used

A slot die coating machine is used to discharge different slurries through the first and second slots respectively. The high viscosity of the second slurry overlaps with the edge of the first slurry to form a barrier layer to fix the edge of the slurry and reduce slippage. The amount and speed of slurry discharge are controlled by adjusting the shape of the slot.

Benefits of technology

It effectively reduces slurry edge slippage, improves electrode thickness uniformity, reduces electrode quality degradation and the risk of secondary battery short circuit or fire, and improves the overall quality of the electrode.

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Abstract

A slit die coater includes a first die block, a second die block below the first die block, a third die block below the second die block, a first spacer between the first die block and the second die block, the first spacer defining a first slit through which a first slurry is to be discharged, the first spacer including a first base, a first sub-guide portion and a second sub-guide portion respectively extending from opposite sides of the first base in a first slurry discharge direction, and an amount of the first slurry to be discharged from the first slit is determined based on shapes of the first sub-guide portion and the second sub-guide portion, and a second spacer between the second die block and the third die block, the second spacer defining a second slit through which a second slurry is to be discharged.
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