Pouch Battery Sealing Using Overlapping Infrared Radiation Zones
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Solution Overview
Problem
Conventional pouch-shaped secondary battery sealing methods face issues with non-uniform heating, wrinkles, and damage to the laminate sheet due to high laser output, leading to inefficiencies and reduced productivity.
Innovation Solution
A pouch-shaped secondary battery sealing apparatus using at least two infrared light radiation portions, with overlapping radiation ranges, to uniformly heat the metal layer and melt the inner sealant layer, minimizing exposure time and energy output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single infrared light radiation portion is used to heat the metal layer, then heating speed increases, but heating uniformity deteriorates causing wrinkles
Solution Approach 1:
The single infrared light radiation portion is divided into multiple infrared light radiation portions (first and second infrared light radiation portions) that radiate infrared light to different regions of the sealed portion. This segmentation allows each radiation portion to heat its specific region uniformly, preventing wrinkles while maintaining fast heating speed through parallel operation of multiple portions.
2Productivity
If high laser output is used to heat the metal layer rapidly, then sealing speed increases, but damage to the laminate sheet increases
Solution Approach 1:
Each infrared light radiation portion is configured to radiate infrared light to a specific local region of the sealed portion. This local quality approach allows controlled heating of specific areas with appropriate energy density, achieving rapid sealing while preventing excessive heat damage to the laminate sheet by distributing the thermal load across multiple localized zones.
3Reliability
If conventional pressing and heating is used, then sealing is achieved, but sealing time is excessive and outer resin layer is damaged
Solution Approach 1:
The conventional mechanical pressing and heating system is replaced with an infrared light-based heating system. The multiple infrared light radiation portions directly heat the metal layer through electromagnetic radiation, eliminating the need for prolonged mechanical pressing and conventional heat conduction, thereby significantly reducing sealing time while maintaining or improving sealing quality.
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 solution achieves uniform sealing, reduces defects, and enhances productivity by rapidly heating the metal layer while minimizing damage to the laminate sheet.
Implementation Method 1
a first infrared light radiation portion configured to radiate the infrared light to the pressing portion, a second infrared light radiation portion configured to radiate the infrared light to overlap a radiation range of the first infrared light radiation portion
Data Source
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AI summary
The present invention relates to a pouch-shaped secondary battery sealing apparatus and a pouch-shaped secondary battery manufacturing method capable of radiating an infrared laser to a sealed portion in an overlapping state, whereby it is possible to increase sealing force, to prevent occurrence of wrinkles, and to reduce sealing time when forming a sealed portion of a pouch-shaped secondary battery case.