Pouch Cell Folding Guide Line to Prevent Molten Resin Intrusion
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Solution Overview
Problem
The formation of a folding guide line in a pouch-type battery cell can result in molten resin penetrating into the electrode-accommodating portion, causing damage to the electrode assembly and reducing the durability and quality of the battery cell.
Innovation Solution
An apparatus with a first and second pressing tool is used to form a folding guide line, where the second pressing tool includes a pressing protrusion and an avoidance portion that prevents molten resin from flowing towards the electrode-accommodating portion by maintaining a distance and angle that avoids applying pressure to this area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If heat and pressure are applied to form the folding guide portion, then the folding guide line is successfully formed, but molten resin penetrates into the electrode-accommodating portion causing damage
Solution Approach 1:
The pressing tool is designed with a pressing avoidance portion that creates a localized non-pressing region near the electrode-accommodating portion. This allows different regions of the sealing portion to experience different pressing conditions - the folding guide line region receives full heat and pressure for proper formation, while the region near the electrode assembly receives reduced pressure to prevent resin penetration, thus protecting the electrode assembly from damage
Solution Approach 2:
The pressing tool is segmented into a pressing portion and a pressing avoidance portion. The pressing portion applies full pressure to form the folding guide line, while the pressing avoidance portion reduces pressure in the critical region adjacent to the electrode assembly. This segmentation allows simultaneous achievement of folding guide line formation and electrode assembly protection
2Ease of manufacture
If pressure is applied to the entire sealing portion, then the folding guide portion is effectively formed, but the electrode assembly is damaged by pushed molten resin
Solution Approach 1:
The pressing tool implements local quality by creating a pressing avoidance portion with reduced pressure in the region adjacent to the electrode assembly. This localized pressure differentiation enables effective folding guide line formation in the sealing portion while preventing molten resin from being pushed into the electrode-accommodating portion, thus maintaining electrode assembly integrity
Solution Approach 2:
The pressing avoidance portion is designed in advance to counteract the harmful effect of molten resin penetration. By preemptively reducing pressure in the critical region before resin can flow into the electrode assembly, the design prevents damage before it occurs, ensuring electrode assembly reliability
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 apparatus effectively controls the flow of molten resin, preventing damage to the electrode assembly and enhancing the durability and quality of the folding portion in the battery cell.
Implementation Method 1
The folding guide portion may be formed by heating and pressing the sealing portion. In this process, a resin contained in an inner layer of a pouch case may be melted by heat and pressure applied.
Implementation Method 2
A molten resin formed in a process for forming the folding guide portion may be pushed in an outward direction from a portion pressed by the applied heat and pressure.
Data Source
AI summary
An apparatus for forming a folding guide line forming a folding guide portion in a sealing portion of a battery cell, includes a first pressing tool and a second pressing tool, forming the folding guide portion by placing the sealing portion therebetween and pressing the sealing portion, wherein the first pressing tool includes a first pressing surface having a flat shape and an accommodating groove having a shape recessed from the first pressing surface, the second pressing tool includes a second pressing surface having a flat shape, a pressing protrusion dispose to oppose the accommodating groove and having a shape in which at least a portion protrudes from the second pressing surface, and a pressing avoidance portion connected to the pressing protrusion, and the pressing avoidance portion has a shape not applying pressure to a portion of the accommodating groove, adjacent to the electrode-accommodating portion.