Metal Frame Bonding for Multilayer Capacitor Reliability
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Solution Overview
Problem
Multilayer capacitors in electronic components face issues with bonding strength between the capacitor and metal frames, which deteriorate under heat and mechanical stress, leading to potential separation and surface scratches, compromising reliability, especially in applications requiring high thermal resistance and vibration durability like eco-friendly vehicles.
Innovation Solution
The design includes external electrodes with band portions of varying areas and metal frames with support and bonding portions that extend to cover these band portions, enhancing bonding strength and reducing impact effects by strategically placing bonding portions on surfaces with larger band portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a portion of the metal frame is bent to cover and hold the multilayer capacitor, then bonding strength is improved, but pressure is applied to the multilayer capacitor causing damage or cracking
Solution Approach 1:
The patent applies preliminary action by pre-bending the metal frame portion before inserting the multilayer capacitor. The metal frame is prepared in advance with a bent configuration that will naturally hold the capacitor, eliminating the need to apply pressure during assembly. This resolves the contradiction by establishing bonding strength through the pre-formed structure rather than through pressing force during installation.
Solution Approach 2:
The metal frame is segmented into distinct functional portions: a bent holding portion that provides mechanical retention, a bonding portion that contacts the capacitor, and a mounting portion for PCB attachment. This segmentation allows each portion to perform its specific function optimally - the bent portion provides holding force without applying damaging pressure to the capacitor body.
2Strength
If a portion of the metal frame is bent to cover the multilayer capacitor, then bonding strength is improved, but the surface of the multilayer capacitor is scratched
Solution Approach 1:
The patent applies local quality by designing the bonding portion with specific surface characteristics - a roughened or textured surface that enhances bonding strength through increased surface area and mechanical interlocking. This localized surface treatment improves bonding without requiring the entire capacitor surface to be roughened, thereby maintaining surface integrity and reliability while achieving strong bonding at the contact points.
3Reliability
If the multilayer capacitor is mounted at a predetermined distance from the board using a metal frame, then durability against vibrations is improved, but bonding portions deteriorate under heat and mechanical impacts
Solution Approach 1:
The patent applies dimensionality change by extending the bonding portion in multiple spatial directions - not only vertically to bond with the capacitor but also horizontally along the capacitor surface. This multi-directional bonding configuration distributes mechanical and thermal stresses across a larger area and multiple contact points, preventing deterioration at any single bonding location while maintaining vibration durability through the elevated mounting structure.
Data Source
AI summary
An electronic component includes a body, external electrodes including head portions disposed on external surfaces of the body, and band portions extending from the head portions to top and bottom surfaces and both side surfaces of the body, respectively, each of the band portions including an extending portion disposed on at least one surface of the body extending beyond a band portion disposed on another surface of the body, and metal frames electrically connected to the pair of external electrodes, respectively. The metal frames includes support portions bonded to the head portions, mounting portions extending from ends of the support portions in a first direction and spaced apart from the body and the external electrodes, and bonding portions extending from the support portions to be bonded to the extending portions.