Electrode Plate Pattern Coating With Heat-Release Film
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Solution Overview
Problem
Conventional methods for manufacturing electrode plates for secondary batteries face challenges in achieving high coating speed, forming efficient electrode patterns, and increasing battery capacity and energy density due to difficulties in synchronizing coating speeds and forming non-coated parts accurately.
Innovation Solution
A method involving the use of an adhesive film that reduces adhesive force through heat during the drying process, allowing for consecutive coating and easy peeling of non-coated parts on the electrode current collector sheet, enabling continuous pattern formation and improving productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If intermittent or discontinuous coating job is performed to form non-coated parts, then the electrode pattern can be formed, but the coating speed decreases and productivity is reduced
Solution Approach 1:
A release film is attached to the current collector sheet in advance at positions where non-coated parts are to be formed. This preliminary action allows the coater to continuously coat the entire sheet without interruption, and the release film is later removed to create the non-coated parts, thus resolving the contradiction between pattern formation precision and coating speed
2Productivity
If coating speed is increased, then productivity improves, but it becomes difficult to synchronize mechanical control of coater head with coating speed, making pattern formation difficult
Solution Approach 1:
The release film positioning is performed in advance before coating, allowing the coater to operate at high speed continuously without needing to synchronize with pattern formation. The pre-positioned film ensures accurate pattern formation while maintaining high coating speed
Solution Approach 2:
The release film acts as an intermediary that decouples the coating process from the pattern formation process. The coater continuously coats over the film, and the film's later removal creates the non-coated parts, eliminating the need for synchronization between coater head mechanical control and coating speed
3Ease of operation
If non-coated parts are formed between coated parts in the width direction, then terminal connection is enabled, but the coated area is reduced and battery capacity and energy density cannot be increased
Solution Approach 1:
Non-coated parts are formed only at specific local positions (width-direction ends) where terminals need to be connected, while the rest of the sheet maintains full coating coverage. This localized approach preserves maximum coated area for battery capacity while enabling necessary terminal connections
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enhances coating speed, increases battery capacity and energy density by enlarging the electrode-slurry-coated area, and improves manufacturing efficiency through automated peeling of adhesive films.
Implementation Method 1
the adhesive force of the adhesive film is reduced by heat during the heating and drying of the electrode slurry
Implementation Method 2
The electrode substrate is dried to allow the electrode active material to be hardened on the surface of the current collector by evaporating the solvent of the electrode slurry
Data Source
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AI summary
The present technology relates to a method for manufacturing an electrode plate for a secondary battery, and the method is a method for manufacturing an electrode plate by performing a pattern-coating to have a coated part, on which an electrode slurry has been coated, and a non-coated part, on which the electrode slurry has not been coated, on an electrode current collector sheet, including: attaching at least one adhesive film on at least one portion of the non-coated part on the electrode current collector sheet; consecutively coating an electrode slurry on the electrode current collector sheet including the adhesive-film-attached portion; heating and drying the electrode slurry; and peeling the adhesive film from the electrode current collector sheet and retrieving the adhesive film. Herein, during the retrieving of the adhesive film, as adhesive force of the adhesive film decreases during the heating and drying of the electrode slurry, the adhesive film becomes detachable from the electrode current collector sheet, and as the adhesive film is detached, a surface of the electrode current collector sheet is exposed. According to the present invention, it is possible to significantly improve the coating speed of the electrode slurry by consecutively forming an electrode pattern and improve the battery capacity and energy density. The present invention also relates to an electrode plate for a secondary battery, which is manufactured by the above method.