Capacitor Recessed Bottom Stabilizes Pressure Valve
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Solution Overview
Problem
Conventional safety devices in capacitors with electrolytic solutions suffer from excessive deformation when internal pressure increases, leading to insufficient stabilization of the pressure valve's operativeness.
Innovation Solution
A capacitor design featuring a recessed part on the inner bottom of the exterior case with a first inclined surface and a steeper second inclined surface, along with a groove, to localize the deformation starting point and reduce the height of deformation, thereby stabilizing the pressure valve's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operating pressure of the pressure valve is increased, then the safety range is improved, but the deformation height of the bottom portion becomes excessively large
Solution Approach 1:
The invention introduces a recessed part with specific geometric features (first and second inclined surfaces) at the bottom of the exterior case. This creates localized structural characteristics that differ from the surrounding areas, allowing the bottom to have different deformation properties in different regions. The recessed part acts as a dedicated deformation zone that accommodates pressure relief while limiting overall deformation height.
Solution Approach 2:
The invention adds vertical dimensionality to the bottom structure by creating a recessed part with inclined surfaces. Instead of a flat bottom, the recessed part introduces depth and angular surfaces that provide additional degrees of freedom for deformation. This dimensional change allows the structure to absorb pressure through controlled deformation in the vertical direction while maintaining lateral stability.
2Reliability
If a weak portion is formed in the bottom of the exterior case, then the pressure valve function is achieved, but the deformation is not localized and affects the entire bottom structure
Solution Approach 1:
The recessed part with its inclined surfaces creates a localized zone with different mechanical properties compared to the rest of the bottom. This local structural modification ensures that when pressure builds up, deformation is concentrated within the recessed part rather than propagating throughout the entire bottom structure. The first and second inclined surfaces define a specific region that serves as the deformation zone.
Solution Approach 2:
The bottom structure is segmented into different functional zones: the recessed part serves as the pressure relief zone, while the surrounding flat bottom areas maintain structural integrity. The inclined surfaces create clear boundaries between the deformation zone and the stable zones, effectively segmenting the bottom into regions with different roles during pressure events.
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 design effectively reduces the height and variation of deformation, stabilizing the pressure valve's operativeness and maintaining a desired internal pressure, as demonstrated by hydraulic and reliability tests.
Implementation Method 1
a first inclined surface radially expanding from a central part area of the inner bottom, the central part area of the inner bottom being the deepest portion of the inner bottom; and a second inclined surface continuing to an outer edge of the first inclined surface, the second inclined surface being steeper than the first inclined surface
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
Figure 3
AI summary
The present application provides a capacitor capable of stabilizing operativeness of a pressure valve and deformation of the pressure valve upon the operation. The capacitor 1 includes: a capacitor element 6 being formed by overlaying and winding a anode foil 8 and a cathode foil 7 with electrolytic papers 3 interposed therebetween and by being impregnated with an electrolytic solution; an exterior case 4, for housing the capacitor element 6, having a cylindrical shape with a bottom; and an opening sealing body 2 for sealing an opening of the exterior case 4. In an inner bottom of the exterior case 4, formed is a recessed part 21 which has a first inclined surface 22 radially expanding from a central part area of the inner bottom, the central part area of the inner bottom being the deepest portion, and a second inclined surface 23 continuing to an outer edge of the first inclined surface 22 and being steeper than the first inclined surface 22, a weak portion is formed inside of the recessed part, and a groove part is formed outside of the inner bottom of the exterior case.