Pouch Battery Sealing Press for Uniform Infrared Laser Heating
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Solution Overview
Problem
Conventional sealing devices for pouch-type secondary batteries face issues with slow heat transfer, damage to the outer resin layer, and uneven heating, leading to poor sealing quality and potential breakage of the pressurizing part.
Innovation Solution
A sealing device using a pressurizing part made of a first light transmitting material with high thermal conductivity and refractive index, combined with a lens unit, to uniformly heat and seal the pouch-type case using infrared laser irradiation, minimizing energy loss and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heating method is used to seal the pouch-type case, then the sealing part is heated and pressed, but the heat transfer from outer resin layer to inner sealant layer is slow and causes damage to the outer resin layer
Solution Approach 1:
The patent replaces the conventional thermal conduction heating method with infrared laser irradiation. The infrared laser directly heats the metal layer through radiative heating, eliminating the slow thermal conduction process through the outer resin layer. This substitution of heating mechanism dramatically reduces heat transfer time and prevents damage to the outer resin layer while achieving effective sealing.
2Productivity
If laser power is increased to heat the metal layer effectively, then the inner sealant layer melts faster, but the pressurizing part may break due to low compressive strength when heated
Solution Approach 1:
The patent optimizes the infrared laser power parameters to achieve effective heating of the metal layer without excessively high power that would cause the pressurizing part to break. By carefully controlling the laser power within an optimal range and adjusting irradiation time, the system achieves fast sealing while maintaining the structural integrity of the pressurizing part.
Solution Approach 2:
The patent introduces an infrared-transmitting pressurizing part as an intermediary between the infrared laser and the sealing layers. This pressurizing part transmits the infrared laser energy to heat the metal layer and inner sealant layer while maintaining mechanical pressure. The intermediary structure allows effective energy transmission while distributing mechanical stress to prevent breakage.
3Manufacturing precision
If uniform heating is not achieved during sealing, then the sealing quality is poor with wrinkles and quality imbalances, but increasing laser power to ensure heating causes pressurizing part breakage
Solution Approach 1:
The patent applies local quality by using infrared laser irradiation that selectively and uniformly heats the metal layer and inner sealant layer at the sealing position. The infrared-transmitting pressurizing part ensures uniform distribution of laser energy across the sealing area, achieving consistent heating without requiring excessive power that would cause breakage.
Solution Approach 2:
The infrared-transmitting pressurizing part serves as an intermediary that uniformly distributes the infrared laser energy across the sealing area. This intermediary structure ensures even heating of the metal layer and inner sealant layer, preventing wrinkles and quality imbalances while maintaining structural integrity through optimized material selection and geometry.
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 device achieves uniform and safe sealing of the pouch-type secondary battery case, improving quality and processability while reducing equipment costs and preventing breakage during the sealing process.
Implementation Method 1
a light source part for irradiating light to the pressurizing part
Implementation Method 2
the infrared irradiation part rapidly heats only the metal layer of the sealing part
Implementation Method 3
the pressurizing part is made of a material through which light irradiated from the light source part is transmissible
Implementation Method 4
the pressurizing part includes a lens unit, to concentrate the irradiated light
Implementation Method 5
the infrared irradiation part rapidly heats only the metal layer of the sealing part of the pouch-type case and melts the inner sealant layer by the heated metal layer
Data Source
AI summary
Disclosed herein relates to a sealing device for a pouch-type secondary battery, the sealing device including a light source part for irradiating light and a pressurizing part for heating and pressurizing a sealing part of a pouch-type case using light irradiated by the light source part, wherein, by applying a first light transmitting material having a high thermal conductivity and a high light refractive index to the sealing unit of the pressurizing part that contacts the sealing part of the pouch-type case, not only can the sealing part of the pouch-type case be uniformly sealed, but also can prevent damage to the sealing unit heated to a high temperature during sealing, so that the quality of the secondary battery can be improved, and at the same time, processability and economy can be improved.