Nano-Columnar Metal-Resin Joining for Battery Hermetic Sealing
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Solution Overview
Problem
Conventional metal-resin composites exhibit insufficient sealing properties at the joining portions, necessitating enhanced sealing capabilities to prevent leaks and ensure hermeticity in applications like lithium-ion batteries.
Innovation Solution
A metal member with a surface featuring a roughened region composed of a base layer of accumulated debris particles and a column group layer of nano columnar bodies, where the nano columnar bodies bond like strings of beads, standing densely in two dimensions, and having an average height of 84 nm or more, is used to enhance sealing when joined with a resin member. This configuration is achieved through pulse laser irradiation, forming the roughened region on the metal surface and filling gaps between the nano columnar bodies with molten resin to create a robust seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the surface of the metal member is subjected to a roughening process using a laser, then the sealing properties between the metal member and the resin member are enhanced, but the manufacturing complexity and process difficulty increase
Solution Approach 1:
The invention changes the parameters of the laser processing by specifying precise control of pulse laser irradiation conditions to form nano columnar bodies with specific height (84 nm or more). This parameter optimization achieves enhanced sealing properties while maintaining process feasibility, resolving the contradiction between reliability improvement and process complexity
Solution Approach 2:
The roughening process is applied locally only to the joining region where the resin member will be bonded, rather than the entire metal surface. This localized treatment enhances sealing properties at the critical interface while minimizing overall process complexity and processing time
2Reliability
If the nano columnar bodies are formed with an average height of 84 nm or more, then the sealing properties are significantly improved, but the manufacturing precision requirements increase
Solution Approach 1:
The pulse laser irradiation uses periodic pulsed energy delivery rather than continuous irradiation. This periodic action allows controlled accumulation of material ejection and nano columnar body formation, achieving precise height control (84 nm or more) through multiple controlled pulses, thereby improving sealing properties while managing manufacturing precision requirements
Solution Approach 2:
The invention replaces conventional mechanical roughening methods with laser-based plasma processing. This substitution enables precise control of nano columnar body formation through optical energy parameters, achieving the required 84 nm height precision and enhanced sealing properties without the limitations of mechanical processing
3Reliability
If the surface is formed with conventional protrusions, then the sealing properties are insufficient, but changing to nano columnar structures increases the device complexity
Solution Approach 1:
The invention transitions from conventional two-dimensional surface roughness to three-dimensional nano columnar structures with specific height (84 nm or more). This dimensional enhancement creates a more effective sealing interface by adding vertical structure that mechanically interlocks with the resin, significantly improving sealing properties while the self-organized formation process manages structural complexity
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 described configuration significantly improves the sealing properties of the metal-resin composite, ensuring effective sealing and preventing leaks by creating a dense, high-aspect-ratio surface that enhances the bonding between the metal and resin components, thereby improving the hermeticity of the composite.
Implementation Method 1
irradiating the surface of the metal member, on which the column group layer is not formed and the roughened region is to be formed, with a pulse laser, so that debris particles generated from the metal member irradiated with the pulse laser are accumulated
Implementation Method 2
debris particles generated from the metal member irradiated with the pulse laser
Data Source
AI summary
A metal member (a lid member and a positive terminal member) has a surface with a joining region to be joined to a resin member (a positive-electrode resin member) to seal between the first space and the second space (outside and inside of a battery) in combination with the resin member. The joining region includes a roughened region formed on the surface and constituted of a base layer composed of accumulated debris particles, and a column group layer composed of nano columnar bodies standing densely in two dimensions, each being formed of the debris particles bonding to one another like strings of beads extending in the height direction from the base layer. The nano columnar bodies in the resin member have an average height of 84 nm or more.