Pouch Battery Notch Structure for Safe Gas Perforation
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Solution Overview
Problem
Pouch-type secondary batteries face risks of ignition or explosion during gas analysis due to internal short circuits caused by metal perforation pins during the perforation process, which is challenging to manage effectively.
Innovation Solution
A pouch-type secondary battery design featuring a notch portion in the sealing portion to accommodate a perforator, ensuring stable perforation and reducing the risk of internal short circuits, with the notch portion having a shape and cross-sectional area matching the perforator for improved adhesion and guidance, and a single unit sheet-type pouch case for easier gas collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a metal perforation pin is used to perforate the pouch during gas analysis, then gas collection is enabled, but internal short circuits occur causing ignition or explosion risk
Solution Approach 1:
The patent introduces a non-conductive perforation pin as an intermediary tool to replace the metal perforation pin. This non-conductive pin serves as a mediator that enables gas collection through perforation while preventing electrical contact between electrodes, thus eliminating the internal short circuit risk that caused ignition or explosion.
2Reliability
If the pouch structure is modified to include a notch portion for perforator seating, then perforation stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-forming a notch portion on the pouch surface at the intended perforation location before the actual perforation operation. This pre-prepared notch provides a designated seating area for the perforator, ensuring stable positioning and accurate perforation without requiring complex real-time adjustments during the gas collection process.
Solution Approach 2:
The notch portion modifies only the local surface geometry of the pouch at the specific perforation site, rather than changing the entire pouch structure. This localized modification maintains the overall simplicity of the pouch design while providing the necessary stability for perforation, thus minimizing the increase in manufacturing complexity.
3Reliability
If the notch portion cross-sectional area is increased to match the perforator body, then adhesion and guidance are improved, but material usage increases
Solution Approach 1:
The patent applies partial action by designing the notch portion cross-sectional area to be equal to or slightly larger than the perforator body cross-section, rather than making it excessively large. This provides sufficient adhesion and guidance for the perforator while avoiding unnecessary material consumption, achieving an optimal balance between perforation reliability and material efficiency.
Data Source
AI summary
A pouch-type secondary battery includes: an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode; and a pouch case including a sealing portion sealed along an edge thereof to accommodate the electrode assembly therein, and a terrace portion formed to extend toward the sealing portion in which an electrode lead is disposed, wherein a notch portion at which a body of a perforator is seated is formed in the sealing portion to form a perforation portion on the terrace portion.