Secondary Battery Sealing Apparatus with Segmented Fusion
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Solution Overview
Problem
The existing sealing apparatus for secondary batteries faces issues with sealant layer leakage and protrusion formation due to excessive melting, leading to reduced sealability and potential short circuits and explosions.
Innovation Solution
A sealing apparatus comprising a sealing member with thermal and non-thermal fusion parts, where the non-thermal fusion parts act as opening grooves to prevent sealant layer leakage, and a welding member for enhanced sealing, using ultrasonic or laser welding to improve seal strength and prevent protrusion areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat and pressure are applied to the sealing part to seal it, then sealing strength is improved, but the sealant layer melts and leaks causing protrusion formation
Solution Approach 1:
The sealing piece is divided into multiple thermal fusion parts and non-thermal fusion parts along the sealing line. The non-thermal fusion parts create intentional gaps that prevent continuous sealant layer melting and leakage, while the thermal fusion parts provide actual sealing. This segmentation resolves the contradiction by localizing the sealing action to prevent protrusion formation while maintaining adequate sealing strength.
Solution Approach 2:
Different portions of the sealing piece have different functions: thermal fusion parts apply heat and pressure for sealing, while non-thermal fusion parts remain open to prevent sealant layer leakage. This local differentiation allows the system to achieve both sealing strength and prevention of protrusion formation simultaneously.
2Reliability
If the sealant layer is melted to seal the sealing part, then sealing is achieved, but the sealing part thickness is reduced deteriorating sealability
Solution Approach 1:
By segmenting the sealing piece into thermal and non-thermal fusion parts, the melting action is localized only to the thermal fusion portions. This prevents excessive overall melting that would reduce sealing part thickness, while still achieving reliable sealing at the thermal fusion locations.
Solution Approach 2:
Instead of applying continuous sealing along the entire sealing line, the invention uses partial action by concentrating sealing only at the thermal fusion parts. This prevents excessive material removal and maintains adequate sealing part thickness while achieving sufficient sealability through the localized sealing zones.
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 effectively prevents sealant layer leakage and protrusion area formation, enhancing seal strength and safety by maintaining the sealant layer integrity and deforming the sealing part shape for improved sealability.
Implementation Method 1
a sealing member comprising a first sealing piece and a second sealing piece, which thermally fuse a surface of the sealing part to seal the sealing part
Implementation Method 2
The welding member may use ultrasonic welding or laser welding
Implementation Method 3
The welding member may use ultrasonic welding or laser welding
Data Source
AI summary
The present invention relates to a sealing apparatus for a secondary battery, which seals a sealing part of a case in which an electrode assembly and an electrolyte are accommodated, and the sealing apparatus comprises a sealing member comprising a first sealing piece and a second sealing piece, which thermally fuse a surface of the sealing part to seal the sealing part, wherein the first sealing piece and the second sealing piece comprise a plurality of thermal fusion parts, which are disposed from an outer end of a surface of the sealing part toward an inner end that is opposite to the outer end to thermally fuse the surface of the sealing part, and non-thermal fusion parts, which are disposed between the plurality of thermal fusion parts and do not seal the surface of the sealing part.