Electrode Rolling with Non-Coating Pressing to Prevent Swelling
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Solution Overview
Problem
The existing electrode rolling processes face challenges in minimizing volume increase and reducing process failures when increasing the loading amount of the electrode composite layer, particularly due to swelling in the non-coating portion of the electrode substrate during high-pressure rolling.
Innovation Solution
An electrode rolling apparatus and method that includes a non-coating portion pressing part with rolling rollers having surface unevenness and different hardness levels to form a pattern on the non-coating portion of the electrode substrate, thereby reducing swelling and improving process efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-pressure rolling is applied to increase the loading amount of the electrode composite layer, then the capacity of the secondary battery is improved, but the non-coating portion of the electrode substrate swells and the process failure rate increases
Solution Approach 1:
The patent divides the rolling process into two distinct segments: a first rolling process that applies high pressure to the coating portion to increase loading amount, and a second rolling process that applies pressure to the non-coating portion to prevent swelling. This segmentation allows each portion to receive tailored treatment, resolving the contradiction between increasing capacity and preventing process failures.
Solution Approach 2:
The patent applies different rolling conditions to different regions of the electrode substrate. The coating portion receives high-pressure rolling to maximize loading amount, while the non-coating portion receives controlled rolling to prevent swelling. This local differentiation of rolling quality resolves the technical contradiction by optimizing each region for its specific functional requirements.
2Volume of moving object
If high-pressure rolling is applied to reduce the volume of the electrode, then the energy density is improved, but swelling occurs in the non-coating portion
Solution Approach 1:
The patent segments the rolling operation into two distinct phases: first rolling that compresses the coating portion to reduce overall electrode volume, and second rolling that specifically addresses the non-coating portion to prevent swelling. This segmentation enables volume reduction while maintaining shape integrity of different regions.
Solution Approach 2:
The patent performs preliminary rolling on the non-coating portion before the final high-pressure rolling of the coating portion. This preliminary action pre-compresses the non-coating portion, creating a structural foundation that prevents swelling during subsequent high-pressure rolling, thus maintaining shape while reducing volume.
3Quantity of substance
If the loading amount of the electrode composite layer is increased to meet rising demand, then the capacity of the secondary battery is improved, but the volume of the electrode increases
Solution Approach 1:
The patent changes the pressure parameters applied during rolling: high pressure during the first rolling process to maximize loading amount and density, followed by controlled pressure during the second rolling process to compact the non-coating portion. This parameter optimization allows increased loading amount while controlling overall volume through enhanced density.
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
The proposed solution effectively reduces swelling in the non-coating portion of the electrode substrate, lowers process failure rates, and increases the winding amount of the electrode substrate, thereby enhancing manufacturing process efficiency.
Implementation Method 1
a non-coating portion pressing part for pressing a non-coating portion region of an electrode substrate to form a pattern
Implementation Method 2
an electrode rolling part for rolling the electrode substrate
Data Source
AI summary
An electrode rolling apparatus including a non-coating portion pressing part for rolling a non-coating portion of an electrode substrate and an electrode rolling method using the same, making it is possible to prevent a swell from occurring in the non-coating portion region in the process of rolling the electrode substrate and enhance the manufacturing process efficiency.