Plasma Separator Treatment for Battery Adhesion and Impregnation
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Solution Overview
Problem
Secondary batteries face challenges with reduced electrolyte impregnation and uneven gas discharge due to inadequate adhesion between electrodes and separators, leading to inconsistent electrode assembly quality.
Innovation Solution
A plasma generating apparatus with a transfer roller, metal member, and protrusion members that create a patterned adhesion area on the separator surface, enhancing adhesion, electrolyte impregnation, and gas discharge by irradiating plasma onto specific areas of the separator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If lamination process is performed to improve adhesion between electrode and separator, then bonding property is improved, but electrolyte impregnation is significantly reduced
Solution Approach 1:
The invention applies plasma treatment only to specific local areas of the separator (edge regions within 5mm from edges) rather than the entire surface. This creates localized adhesion promotion zones that provide sufficient bonding between electrode and separator while preserving the bulk separator's porosity for electrolyte impregnation. The selective treatment resolves the contradiction by making adhesion properties spatially variable - high at edges where needed for structural integrity, low in the center where electrolyte absorption is critical.
2Strength
If lamination process is performed to improve adhesion between electrode and separator, then bonding property is improved, but gas discharge is not smooth and uniform quality is difficult to secure
Solution Approach 1:
By treating only the edge regions of the separator with plasma, the invention creates differentiated zones: treated edges provide strong adhesion for structural stability, while untreated central regions maintain proper porosity for uniform electrolyte distribution and gas discharge. This local differentiation ensures uniform overall quality by preventing the over-adhesion problem that would occur with full-surface treatment.
Solution Approach 2:
The invention applies plasma treatment to only a partial area (edge regions within 5mm) rather than the entire separator surface. This partial action is sufficient to achieve the necessary adhesion at critical bonding locations while avoiding the harmful effects of complete surface treatment, thus resolving the contradiction between adhesion strength and uniform quality.
3Strength
If plasma is irradiated onto the entire separator surface to improve adhesion, then adhesion is enhanced, but electrolyte impregnation is reduced
Solution Approach 1:
The invention selectively irradiates plasma only onto edge regions of the separator (within 5mm from edges) rather than the entire surface. This localized treatment enhances adhesion at the critical edge areas where electrode-to-separator bonding is needed, while preserving the porosity and electrolyte absorption capacity of the central separator regions. The spatial differentiation of plasma treatment resolves the contradiction between adhesion enhancement and electrolyte impregnation maintenance.
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 apparatus improves adhesion between electrodes and separators, ensuring uniform electrolyte impregnation and efficient gas discharge, thereby enhancing the quality and reliability of the electrode assembly.
Implementation Method 1
a plasma generating member configured to interact with the metal member to generate plasma and irradiate the generated plasma onto a surface of the separator
Data Source
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AI summary
The present invention relates to a plasma generating apparatus for a secondary battery. The plasma generating apparatus for the secondary battery comprises: a transfer roller configured to transfer a separator; a metal member built in the transfer roller; a plasma generating member configured to interact with the metal member to generate plasma and irradiate the generated plasma onto a surface of the separator; and a protrusion member configured to realize an adhesion area from which a portion of the separator closely attached to the transfer roller protrudes and onto which the plasma is irradiated to provide adhesion and a non-adhesion area onto which the plasma is not irradiated or is weakly irradiated when compared with the adhesion area so that there is no adhesion or the resulting adhesion is weaker than that of the adhesion area.