Laser Waveguide Pouch Sealing for Uniform Battery Seals
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Solution Overview
Problem
Conventional pouch-type secondary battery sealing devices face issues with slow heat transfer from the outer resin layer to the inner sealant layer, leading to damage and prolonged sealing times, and they struggle to maintain a consistent sealing width and thickness, especially when the internal structure of the pouch changes.
Innovation Solution
A pouch sealing device using a laser that integrates a waveguide to pressurize and heat-fuse the pouch, minimizing thermal wrinkles and external damage by uniform energy irradiation, and allows for a consistent sealing width and thickness without requiring mold replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressurization and heating are performed by a single member, then the sealing process can be completed, but the heat transfer time is prolonged and the outer resin layer is damaged
Solution Approach 1:
The sealing device divides the heating and pressurization functions into separate components: a heating member that provides rapid laser heating and a separate pressurizing member that applies pressure. This segmentation allows simultaneous heating and pressurization without the heat transfer delays and outer layer damage caused by conventional single-member systems.
2Reliability
If conventional heating and pressurization are performed by a single member, then the sealing process can be completed, but the outer resin layer is damaged
Solution Approach 1:
The sealing device divides the heating and pressurization functions into separate components: a heating member that provides rapid laser heating and a separate pressurizing member that applies pressure. This segmentation allows simultaneous heating and pressurization without the outer resin layer damage caused by conventional single-member systems.
Solution Approach 2:
The laser heating is applied in a controlled, rapid manner that heats the inner sealant layer quickly before the heat can propagate to and damage the outer resin layer. The separated pressurizing member then completes the sealing process without causing thermal damage.
3Adaptability or versatility
If the internal structure of the pouch is changed, then the pouch design can be optimized, but the sealing width and thickness become inconsistent
Solution Approach 1:
The sealing device uses a laser as the heat source, which can be precisely controlled and focused on the sealing area regardless of the pouch's internal structure. The separate pressurizing member applies uniform pressure across the sealing area, ensuring consistent sealing width and thickness even when the pouch design changes.
4Reliability
If conventional heating methods are used, then the sealing process can be completed, but thermal wrinkles and external damage occur
Solution Approach 1:
The sealing device divides the heating and pressurization functions into separate components: a heating member that provides rapid laser heating and a separate pressurizing member that applies pressure. This segmentation allows uniform energy irradiation and prevents thermal wrinkles by avoiding the uneven heating and localized overheating that cause such defects.
Solution Approach 2:
The patent replaces conventional contact-based heating mechanisms with laser heating, which provides uniform, non-contact energy delivery to the sealing area. This eliminates the mechanical pressure points and uneven heat distribution that cause thermal wrinkles in conventional sealing systems.
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 laser-based sealing device achieves rapid and damage-free sealing with a consistent width and thickness, even when the internal structure changes, by using a mold-integrated waveguide to pressurize and heat-fuse the pouch, ensuring optimal sealing strength.
Implementation Method 1
a first laser bundle array being coupled to the first waveguide and supplying the laser through the first waveguide region so that the first and second sealing layers are heat-fused each other to be sealed
Implementation Method 2
a first waveguide pressurizing the first pouch and having a first waveguide region
Data Source
AI summary
The present disclosure relates to a pouch sealing device using a laser that heat-fuses a pouch of a pouch-type secondary battery, and to this end, the present disclosure discloses a pouch sealing device using a laser comprising a first pouch having a first insulating layer, a first metal layer, and a first sealing layer, and a second pouch having a second insulating layer, a second metal layer, and a second sealing layer, the first sealing layer of the first pouch and the second sealing layer of the second pouch may be heat-fused each other, the pouch sealing device may comprise a first waveguide pressurizing the first pouch and having a first waveguide region and a first laser bundle array being coupled to the first waveguide and supplying the laser through the first waveguide region so that the first and second sealing layers are heat-fused each other to be sealed.