Electrochemical Device Thermally Fusible Resin Layer Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrochemical devices face issues with insufficient electrical insulation and reduced bonding strength in the vicinity of electrode terminals due to decreased thickness of laminated films, leading to potential electrolyte leakage.
Innovation Solution
The electrochemical device employs a layered film structure where the thickness of thermally fusible resin layers varies between areas with and without electrode terminals, ensuring higher thickness at first sealed portions for insulation and lower thickness at second sealed portions for bonding strength, maintaining overall sealing integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of thermally fusible resin layers is decreased in portions where upper and lower laminated films indirectly overlap with electrode terminals interposed therebetween, then bonding strength is improved, but electrical insulation becomes insufficient
Solution Approach 1:
The patent applies local quality by differentiating the thickness of thermally fusible resin layers in different regions: the first sealed portion (without electrode terminals) has a smaller thickness for optimal bonding strength, while the second sealed portion (with electrode terminals) has a larger thickness for sufficient electrical insulation. This regional differentiation resolves the contradiction between bonding strength and electrical insulation requirements.
2Ease of manufacture
If the thickness of laminated films is decreased in portions where upper and lower laminated films indirectly overlap with electrode terminals interposed therebetween, then bonding strength is partially reduced, but manufacturing complexity is reduced
Solution Approach 1:
The patent specifies different thickness ranges for different sealed portions: the first sealed portion has a thickness of 0.03-0.08 mm for optimal bonding, while the second sealed portion has a thickness of 0.05-0.10 mm to maintain adequate bonding strength despite the presence of electrode terminals. This local differentiation maintains manufacturing feasibility while ensuring adequate bonding strength in each region.
3Strength
If the thickness of thermally fusible resin layers is uniformly decreased across all sealed portions, then overall bonding strength is improved, but sealing becomes insufficient causing electrolyte leakage
Solution Approach 1:
The patent applies local quality by specifying different thickness ranges for different sealed portions: the first sealed portion (without electrode terminals) has a thickness of 0.03-0.08 mm for optimal bonding strength, while the second sealed portion (with electrode terminals) has a thickness of 0.05-0.10 mm to ensure adequate sealing integrity and prevent electrolyte leakage. This regional differentiation resolves the contradiction between bonding strength and sealing integrity.
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 approach achieves high bonding strength and sufficient insulation across the entire outer container, particularly around electrode terminals, preventing electrolyte leakage and ensuring stable performance.
Implementation Method 1
a thermally fusible resin layer is formed on one surface of a metal foil... The overlapping thermally fusible resin layers are bonded to each other, thereby forming the outer container
Data Source
AI summary
An electrochemical device comprising an electrode assembly in which two types of electrodes are stacked or wound with separators interposed therebetween and an outer container that accommodates the electrode assembly; wherein electrode terminals extend to the outside from within the outer container. The films which cover the electrode assembly overlap each other on the outside of the outer peripheral portion of the electrode assembly, and the outer container is formed by bonding the films to each other. The portion of the films that overlap and are bonded to each other comprises a first sealed portion in which the films overlap and are bonded to each other in an overlapping state with the electrode terminals interposed therebetween, and comprises a second sealed portion in which the films are bonded to each other in a directly overlapping state without interposition of the electrode terminals.