Solid Electrolytic Capacitor Recessed Connection Member
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Solution Overview
Problem
Conventional solid electrolytic capacitors face electrical connection defects due to displacement of the pillow member during the manufacturing process, especially as capacitors are miniaturized, leading to unreliable connections between the positive electrode lead and the pillow member.
Innovation Solution
The design incorporates a recessed portion or through hole in the positive electrode connection member, which the pillow member is positioned over, and a conductive bonding member that enters these features to secure the pillow member in place, ensuring precise alignment and preventing displacement, thus ensuring a reliable electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the capacitor is miniaturized to reduce size, then the volume and area are reduced, but the manufacturing precision and reliability of electrical connections deteriorate due to pillow member displacement
Solution Approach 1:
The recessed portion is formed in the positive electrode connection member before the pillow member is positioned. This preliminary structural preparation provides a predefined positioning feature that guides and constrains the pillow member to the correct location, preventing displacement during subsequent manufacturing steps. The recessed portion acts as a pre-established mechanical stop that ensures accurate positioning even in miniaturized capacitors where tolerance is critical.
Solution Approach 2:
The recessed portion serves as an intermediary structural feature between the positive electrode connection member and the pillow member. It mediates the connection by providing a physical interface that both components interact with - the recessed portion receives and secures the pillow member, ensuring reliable electrical connection while accommodating miniaturization requirements.
2Volume of moving object
If the capacitor is miniaturized to reduce size, then the volume and area are reduced, but the reliability of electrical connections deteriorates due to increased susceptibility to displacement
Solution Approach 1:
The recessed portion is formed in advance in the positive electrode connection member to create a predetermined positioning feature. This preliminary action ensures that when the pillow member is placed, it is immediately guided into the correct position and secured, preventing displacement that would cause electrical connection defects. This is particularly critical in miniaturized capacitors where the margin for error is minimal.
Solution Approach 2:
The recessed portion acts as an intermediary mechanism that enhances reliability by providing a mechanical interface between the positive electrode connection member and the pillow member. This intermediary structure ensures stable electrical connection by preventing pillow member displacement, thereby maintaining connection reliability even as the overall capacitor size is reduced.
3Manufacturing precision
If a recessed portion or through hole is added to the positive electrode connection member to prevent displacement, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
Instead of modifying the entire positive electrode connection member, the recessed portion is created only in the specific local area where the pillow member needs to be positioned. This localized modification provides the necessary positioning precision without adding complexity to the overall structure. The recessed portion is a simple geometric feature formed only where needed, maintaining simplicity elsewhere in the device.
Solution Approach 2:
The positive electrode connection member is segmented functionally - the recessed portion is a distinct structural feature separated from the rest of the connection member. This segmentation allows the recessed portion to serve its specific positioning function independently, while the remainder of the connection member maintains its original simple structure for electrical connection purposes.
Data Source
AI summary
A solid electrolytic capacitor includes: an insulating substrate; a capacitor element; a positive electrode lead-out structure; and a negative electrode lead-out structure. The positive electrode lead-out structure includes: a positive electrode terminal formed on the insulating substrate; a first positive electrode connection member formed on the insulating substrate; a second positive electrode connection member electrically connecting the first positive electrode connection member to the positive electrode terminal; and a pillow member configured to electrically connect the capacitor element to the first positive electrode connection member. The first positive electrode connection member has a recessed portion or a through hole. The recessed portion or the through hole overlaps an edge of a bottom surface of the pillow member having a first end of the recessed portion or the through hole disposed outside the edge and a second end of the recessed portion or the through hole disposed inside the edge.