Pouch Battery Non-Sealing Residue Portion for Gas Management
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Solution Overview
Problem
Pouch-shaped secondary batteries face issues with swelling and explosion due to high pressure from electrolyte decomposition during abnormal conditions, as existing solutions complicate manufacturing and increase costs.
Innovation Solution
A secondary battery design featuring a non-sealing residue portion between the battery case and electrode assembly, where the residue portion is formed by sealing three sides of laminate sheets and injecting electrolyte through a non-sealing portion, allowing gas collection and preventing pressure buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-sealing portion is formed between the electrode assembly and sealing portion to collect gas, then battery safety is improved, but the receiving part size increases and manufacturing complexity increases
Solution Approach 1:
The invention extracts the gas collection function from the receiving part by creating a separate non-sealing residue portion between the electrode assembly and sealing portion. This allows gas to be collected in a dedicated space without requiring the receiving part to be larger or more complex, thus improving safety while maintaining simple manufacturing
Solution Approach 2:
The invention segments the battery case into distinct functional zones: a sealed receiving part for the electrode assembly and a non-sealing residue portion for gas collection. This segmentation allows each part to perform its specific function efficiently without interfering with manufacturing simplicity
2Reliability
If the receiving part size is increased to accommodate gas expansion, then battery safety is improved, but the overall battery size increases
Solution Approach 1:
The invention utilizes the vertical dimension between the electrode assembly and sealing portion to create the gas collection space, rather than increasing the horizontal receiving part size. This allows gas expansion to occur in the available vertical space without increasing the overall battery footprint
3Reliability
If a non-sealing portion is formed to prevent pressure buildup, then battery safety is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention applies different sealing qualities to different parts of the battery case: the receiving part and electrode leads require precise sealing, while the residue portion is intentionally left non-sealing. This local differentiation of sealing requirements improves safety without unnecessarily increasing precision requirements across the entire manufacturing process
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 design effectively prevents battery deformation and explosion by allowing gas expansion within the residue portion, simplifying manufacturing and enhancing safety without increasing the size of the receiving part.
Implementation Method 1
a non-sealing residue portion, which is not sealed, for collecting gas generated when the secondary battery is in an abnormal operating condition
Data Source
AI summary
Disclosed herein is a secondary battery including an electrode assembly of a cathode/separator/anode structure mounted in a pouch-shaped battery case in a sealed state, wherein a residue portion, which is not sealed (non-sealing residue portion), is defined between a sealing portion of the battery case and the electrode assembly for collecting generated gas, and the non-sealing residue portion is formed by mounting the electrode assembly between upper and lower laminate sheets, at least one of which has a receiving part of a size approximately corresponding to the electrode assembly, sealing three sides of the upper and lower laminate sheets, including two sides where electrode terminals are disposed, among four sides of the upper and lower laminate sheets, injecting an electrolyte in the battery case through the non-sealing portion, and sealing the non-sealing portion such that the resultant sealing portion is spaced a predetermined width from the receiving part.