Multilayer Ceramic Capacitor Relay Layer Connection Stability
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Solution Overview
Problem
Existing multilayer ceramic capacitors face instability in connections between internal electrode layers and external electrodes when size reduction and capacitance increase are demanded, leading to unreliable connections due to the small dimensions of lead parts.
Innovation Solution
The introduction of relay layers with conductive and low-conductive parts that connect internal electrode layers to external electrodes over specific widths, ensuring stable connections even with reduced dimensions, and the use of cover layers to enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the length-direction dimension and height-direction dimension of internal electrode layers are decreased to meet size reduction demand, then the capacitor size is reduced, but the connection between lead parts and external electrodes becomes unstable
Solution Approach 1:
The patent divides the connection structure into multiple segments: internal electrode layers, relay layers with conductive and low-conductive parts, and external electrodes. This segmentation allows the lead parts to extend in the width direction rather than relying solely on length-direction dimensions, maintaining connection stability while reducing overall capacitor size.
Solution Approach 2:
The patent transitions from relying on length-direction and height-direction dimensions to utilizing the width direction for lead part connections. By orienting lead parts to extend in the width direction and connecting them to external electrodes on width-direction faces, the invention maintains connection reliability while reducing the capacitor's length and height dimensions.
2Quantity of substance
If the length-direction dimension of internal electrode layers is decreased to increase capacitance density, then capacitance per unit volume increases, but the lead part dimensions become extremely small causing unstable connections
Solution Approach 1:
The patent applies different properties to different parts of the electrode structure. The relay layers have both conductive parts (for electrical connection) and low-conductive parts (for structural support and insulation). This local differentiation allows the lead parts to maintain adequate dimensions for stable connections while the internal electrode layers achieve high capacitance density through reduced length-direction dimensions.
Solution Approach 2:
The relay layers act as intermediary structures between the internal electrode layers and external electrodes. These relay layers provide enlarged connection surfaces and extended lead parts that bridge the gap between the small internal electrodes and the external electrodes, ensuring stable connections even when the internal electrode dimensions are minimized for high capacitance density.
Data Source
AI summary
In an embodiment, one length-direction end of each first internal electrode layer 111a of the capacitor body 110 is connected, via the conductive part 114a of the first relay layer 114 connected over a connection width equivalent to the width of each first internal electrode layer 111a, to the first external electrode 120 provided on one height-direction face of the capacitor body 110; also, the other length-direction end of each second internal electrode layer 111b is connected, via the conductive part 115a of the second relay layer 115 connected over a connection width equivalent to the width of each second internal electrode layer 111b, to the second external electrode 130 provided on one height-direction face of the capacitor body 110.