Gas Detection Sheet Using Porous Coordination Polymer
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Solution Overview
Problem
Existing gas detection methods for electrochemical elements, such as lithium ion secondary batteries and capacitors, face challenges in detecting gas leaks with high sensitivity and determining the leak position, especially due to the swelling issues with pouch-type electrochemical elements and the complexity of existing detection methods.
Innovation Solution
A gas detection sheet utilizing a porous coordination polymer supported on a substrate with specific air permeability, which undergoes a color change in response to gas adsorption, allowing for sensitive and visible detection of gas leaks, including volatile organic compounds, by leveraging the spin crossover phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas sensor and hermetic battery manufacturing process with detected gas atmosphere are used, then gas leakage detection capability is improved, but device complexity and manufacturing cost increase due to requiring detected gas supplying devices, pressure reducing devices, and complex sensing processes
Solution Approach 1:
The patent extracts the gas detection function from a complex sensor-based system and implements it using a simple colorimetric reagent layer that changes color in response to gas leakage, eliminating the need for gas sensors, hermetic containers, and complex detection processes
Solution Approach 2:
The patent applies color change phenomenon through a reagent layer that exhibits visible color variation when exposed to gases leaked from the electrochemical element, providing a simple visual detection method without requiring complex instrumentation
2Reliability
If a gas detection tube is used to detect gas in atmosphere, then gas leakage detection is improved, but the ability to determine gas leaking position deteriorates as it cannot identify where the leak occurs
Solution Approach 1:
The patent applies local quality by placing the colorimetric reagent layer at specific locations on the electrochemical element, allowing the color change to occur locally at the leak site and thereby providing spatial information about where the gas leakage is occurring
3Reliability
If existing detection methods are used, then gas detection capability is improved, but the ability to detect gases during transportation and storage deteriorates due to requiring removal from the electrochemical element
Solution Approach 1:
The patent merges the gas detection function directly onto the electrochemical element itself by integrating the colorimetric reagent layer with the element structure, allowing detection to be performed in situ during transportation and storage without removing the element from its packaging
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 gas detection sheet provides excellent visibility and sensitivity in detecting gas leaks, enabling the determination of leak positions without removing the sheet from the electrochemical element, and can detect gases during various processes, including transportation and storage.
Implementation Method 1
a porous coordination polymer represented by formula (1) is supported on a supporter wherein the air permeability is 0.8 seconds or more and 60 seconds or less
Implementation Method 2
undergoes a color change in response to gas adsorption, allowing for sensitive and visible detection of gas leaks, including volatile organic compounds, by leveraging the spin crossover phenomenon
Data Source
AI summary
A gas detection sheet wherein a porous coordination polymer represented by formula (1) is supported on a supporter and the air permeability of the gas detection sheet is 0.8 seconds or more and 60 seconds or less.Fex(pz)[Ni1-yMy(CN)4] (1)(wherein, pz=pyrazine, 0.95≤x<1.05, M=Pd or Pt, 0≤y<0.15).