Electrolytic Capacitor Seating Plate Layout for Warpage Control
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Solution Overview
Problem
The existing surface mounting-type electrolytic capacitors face a decrease in joint strength due to warpage caused by stress in the bent portions of auxiliary terminal connections, leading to insufficient solder joints when the seating plate is thinned for downsizing.
Innovation Solution
The electrolytic capacitor design includes a seating plate with auxiliary terminals having an auxiliary mounting portion and embedded portions that are bent along specific axes, reducing the number of bent portions and ensuring the terminals are spaced apart from adjacent grooves, allowing for improved solder fillet formation and increased joint strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the seating plate is thinned for downsizing, then the component size is reduced, but warpage is caused in the seating plate due to stress remaining in the bent portion of the piece connecting the auxiliary terminal portions
Solution Approach 1:
The auxiliary terminal portions are separated into independent structures rather than being connected by a piece. Each auxiliary terminal portion is formed independently and disposed on both sides of the groove, eliminating the connecting piece that causes stress and warpage when the seating plate is thinned.
2Volume of moving object
If the seating plate is thinned for downsizing, then the component size is reduced, but the solder joint between the auxiliary terminal portions and the circuit board becomes insufficient
Solution Approach 1:
The auxiliary terminal portions are designed with specific local characteristics - they are disposed away from the groove by a predetermined distance to create optimal soldering zones. This local optimization ensures sufficient solder joint strength even when the overall seating plate thickness is reduced for downsizing.
3Device complexity
If two auxiliary terminal portions are formed by bending one metal plate with a connecting piece, then the structure is integrated, but stress remains in the bent portion causing warpage
Solution Approach 1:
The auxiliary terminal portions are formed as separate independent structures rather than as a single bent metal plate with connecting pieces. This segmentation eliminates the bent portions that generate stress and prevent warpage in the thinned seating plate.
Data Source
AI summary
A seating plate pair has a mounting surface having a pair of terminal storage grooves. Distal end portions of a pair of lead terminals are inserted into the pair of terminal storage grooves, respectively. The seating plate includes an auxiliary terminal on the mounting surface. The auxiliary terminal includes an auxiliary mounting portion, and a first embedded portion and a second embedded portion protruding respectively from both sides of the auxiliary mounting portion. The first embedded portion and the second embedded portion are embedded in the seating plate, and the auxiliary mounting portion is exposed on the mounting surface. On the mounting surface, the auxiliary terminal is disposed away from an adjacent terminal storage groove by ⅕ or more of a width of the adjacent terminal storage groove.