Flat Metal Terminal Expansion Member for Overcurrent Protection
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Solution Overview
Problem
Existing electronic component devices do not adequately prevent overcurrent, as the thermal fuse expansion mechanism can be unreliable due to localized force distribution when the opposing face is bent or curved.
Innovation Solution
Incorporating a flat opposing face on the metal terminal connected to the external electrode via a bonding member, with a thermally expandable expansion member disposed between them, ensures balanced and complete separation upon heating, effectively breaking the bonding and preventing overcurrent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the opposing face is bent or curved, then the structure can accommodate thermal expansion, but the force is localized and the bonding cannot be reliably broken
Solution Approach 1:
Instead of making the opposing face bent or curved to accommodate thermal expansion, the patent inverts the approach by making the opposing face flat. This flat surface ensures uniform force distribution from the expansion member, allowing reliable bond breaking for overcurrent prevention while maintaining structural stability through the flat geometry itself.
2Reliability
If the opposing face is flat, then the entire face receives force uniformly, but the structure is less flexible in accommodating expansion
Solution Approach 1:
The patent changes the geometric parameter of the opposing face from bent/curved to flat, and changes the material parameter of the expansion member to have high thermal expansibility. This combination allows the flat face to receive uniform force while the expansion member's material properties provide the necessary structural adaptability during thermal expansion.
3Reliability
If the expansion member is disposed around the bonding member, then the bonding is easily broken, but the device complexity increases
Solution Approach 1:
The expansion member serves multiple functions: it provides thermal expansion to break the bonding, acts as a spacer to maintain proper positioning, and ensures uniform force distribution across the flat opposing face. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity while maintaining high overcurrent prevention effectiveness.
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 electronic component device reliably prevents overcurrent by ensuring the entire opposing face receives force from the expansion member, leading to consistent and balanced breaking of the bonding, thus enhancing safety and performance.
Implementation Method 1
The expansion member having thermal expansibility is disposed between the opposing face and the one of the pair of external electrodes. When the electronic component is heated, the expansion member thermally expands.
Data Source
AI summary
An electronic component device includes an electronic component, a pair of metal terminals, a bonding member, and an expansion member having thermal expansibility. The electronic component includes an element body and a pair of external electrodes. The element body has a pair of end faces opposed to each other. The pair of external electrodes is disposed on the pair of end faces. The pair of metal terminals is electrically connected to the pair of external electrodes. The bonding member bonds one of the pair of external electrodes to one of the pair of metal terminals. The bonding member electrically connects the one of the pair of external electrodes to the one of the pair of metal terminals. The one of the pair of metal terminals includes an opposing face. The opposing face is a flat face.