Secondary Battery Gas Collection With Side Sealing and Real-Time Analysis
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Solution Overview
Problem
Existing methods for collecting and analyzing gases generated inside secondary batteries face challenges such as difficulty in maintaining airtightness, dilution of analysis target gases, and inability to apply necessary conditions during the analysis process.
Innovation Solution
A gas collecting apparatus comprising a lower jig part, sealing part, and upper jig part that allows for real-time gas collection with a seal formed on the side surface, coupled with a gas analysis apparatus that includes a carrier gas supply, mass flow control, and gas analysis unit to analyze gases under various conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the secondary battery is entirely accommodated in the gas diffusion space, then gas collection is possible, but separate analysis conditions cannot be applied to the battery and gas dilution occurs
Solution Approach 1:
The gas collection device is divided into two functional parts: a lower jig part for battery placement and an upper jig part with gas diffusion space. This segmentation allows the battery to remain accessible for condition application while gas is collected in the diffusion space above it, resolving the contradiction between reliable gas collection and adaptability for various analysis conditions.
Solution Approach 2:
The invention transitions from horizontal accommodation (battery entirely inside diffusion space) to vertical arrangement (battery below, diffusion space above). This dimensional change enables simultaneous access to the battery for applying conditions and collection of gas in the upper space, eliminating both dilution and adaptability limitations.
2Reliability
If the secondary battery is entirely accommodated in the gas diffusion space, then gas collection is possible, but the analysis target gas is diluted more than necessary
Solution Approach 1:
By segmenting the device into lower and upper parts, the battery occupies only the necessary space below while the gas diffusion space is confined to the upper region. This prevents excessive diffusion space volume that would cause dilution, while maintaining reliable gas collection through the sealed configuration.
Solution Approach 2:
The vertical arrangement concentrates the gas diffusion space directly above the battery perforation hole, creating a compact collection zone. This reduces the overall diffusion volume compared to horizontal accommodation, thereby maintaining higher gas concentration while ensuring reliable collection.
3Productivity
If gas collection apparatus is closely contacted with the battery case surface, then gas collection efficiency improves, but airtightness cannot be maintained due to case bends from perforation
Solution Approach 1:
A sealing part acts as an intermediary between the lower jig part and the battery case. This sealing component compensates for surface irregularities and bends caused by perforation, maintaining airtightness while allowing the gas collection apparatus to remain closely positioned for efficient gas collection.
Solution Approach 2:
The sealing part functions as a flexible sealing element that can adapt to the battery case surface contours, including bends from perforation. This flexible sealing approach maintains airtight contact without requiring perfect surface flatness, ensuring both efficiency and 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
Enables real-time gas collection and analysis of secondary batteries while maintaining a stable seal and applying conditions like charging, discharging, temperature changes, and vibrations, ensuring efficient gas delivery and accurate analysis.
Implementation Method 1
a sealing part having a closed loop shape located above the lower jig part... the sealing part is located in between the lower jig part and the upper jig part
Implementation Method 2
the analysis target gas is diffused in the gas diffusion space
Data Source
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AI summary
The present invention relates to a gas collection device. Disclosed are a gas collection device for collecting, in real time, gas generated in a cylindrical secondary battery, and a gas analysis device using same.