Stacked Capacitor Slit Layout for Cut-Surface Insulation
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Solution Overview
Problem
Stacked film capacitors face insulation deterioration at cut surfaces due to exposed metal films, which can lead to short-circuits and reduced dielectric breakdown voltage, limiting their application in high-reliability applications like electric vehicles and inverter systems.
Innovation Solution
The design incorporates a stacked capacitor structure with alternating metal and dielectric layers, featuring insulation margins and slits that prevent direct contact between metal films at cut surfaces, ensuring continuous insulation and enhanced self-healing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If metal films are exposed on cut surfaces to maintain electrical connectivity, then ease of manufacture is improved, but insulation deterioration occurs leading to short-circuits
Solution Approach 1:
The metal films are divided into multiple segments separated by slits. This segmentation prevents continuous metal film exposure at cut surfaces, eliminating the short-circuit path while maintaining electrical connectivity through the segmented structure. The slits create isolated metal film sections that cannot bridge across the cut surface.
Solution Approach 2:
The slits act as intermediary insulating structures between metal films. By introducing these intermediate elements, the patent prevents direct contact between exposed metal films at cut surfaces, thereby maintaining insulation performance without compromising manufacturing simplicity.
2Reliability
If metal films are removed or sectioned at cut positions to prevent short-circuits, then insulation performance is improved, but manufacturing complexity increases
Solution Approach 1:
Instead of removing metal films entirely, the patent segments them using slits. This maintains the metal film structure for electrical connectivity while preventing continuous exposure that causes short-circuits. The segmented approach simplifies manufacturing compared to complete removal or complex sectioning schemes.
Solution Approach 2:
The slits are strategically positioned only where needed to prevent short-circuits at cut surfaces, rather than uniformly across the entire metal film. This localized modification maintains insulation performance without unnecessarily increasing structural complexity in non-critical areas.
3Quantity of substance
If continuous metal films are used across dielectric layers, then capacitance is improved, but dielectric breakdown risk increases due to insulation deterioration
Solution Approach 1:
The continuous metal film is segmented into multiple sections by slits, which prevents the formation of continuous conductive paths that could cause dielectric breakdown. The segmented structure maintains sufficient capacitance through distributed metal film areas while eliminating the harmful continuous exposure effect.
Solution Approach 2:
The slits, which initially appear to reduce metal film area, actually convert the harmful continuous exposure into beneficial segmented isolation. This transformation maintains or even improves dielectric breakdown resistance while preserving capacitance through optimized metal film distribution.
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
This design significantly reduces insulation deterioration and maintains high dielectric breakdown voltage, making it suitable for harsh environments such as electric vehicles and inverter systems while ensuring reliable operation and safety.
Implementation Method 1
the energy from the short-circuit causes a portion of the metal film around the defective portion to evaporate and diffuse to insulate the defective portion of the dielectric layer
Data Source
AI summary
A stacked capacitor includes a body having opposing faces, first side faces in a first direction, and second side faces in a second direction. The body includes a first insulation margin without a first metal film and a second insulation margin without a second metal film. The first metal film includes a metal film edge overlapping the second insulation margin. The second metal film includes a metal film edge overlapping the first insulation margin. The first and second metal films each include multiple sub-films separated by multiple first slits. A first slit includes a first portion extending from the first or second insulation margin along the first side faces and a second portion located in the metal film edge and extending at an angle with the first side faces. The second portion has a length in the first direction greater than or equal to an interval between adjacent first slits.


