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IMMOBILIZER FOR ADVANCED VALVE METAL CAPACITORS

IP.com Disclosure Number: IPCOM000240258D
Publication Date: 2015-Jan-16
Document File: 3 page(s) / 119K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention relates to capacitor assemblies that minimize the effect of shock and vibration to internal valve metal electrodes, improving mechanical robustness and reliability. Valve metal (Al, Ta, Nb, Ti, Zr, Zn, Mg, Hf, Pd, Ir, Ru, Mb) capacitors are more susceptible to mechanical shock and vibration as anodes become larger due to increased anode mass. Due to the rigidity of the solid valve metal anodes, capacitor assemblies need to be designed with clearance to allow for tolerance variation. The described invention immobilizes the valve metal anode using material compatible with most electrolytes used with valve metal capacitors. The immobilizer geometry is designed with holes to allow free flow of electrolyte during the fill process. The geometry is also designed to be compliant to allow a nominally interference fit. By centering the valve metal anode within the enclosure, the invention further isolates fragile separator layers from thermal damage from welding.

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IMMOBILIZER FOR ADVANCED VALVE METAL CAPACITORS

            The invention relates to capacitor assemblies that minimize the effect of shock and vibration to internal valve metal electrodes, improving mechanical robustness and reliability. 

            Valve metal (Al, Ta, Nb, Ti, Zr, Zn, Mg, Hf, Pd, Ir, Ru, Mb) capacitors are more susceptible to mechanical shock and vibration as anodes become larger due to increased anode mass.  Due to the rigidity of the solid valve metal anodes, capacitor assemblies need to be designed with clearance to allow for tolerance variation.  The described invention immobilizes the valve metal anode using material compatible with most electrolytes used with valve metal capacitors.  The immobilizer geometry is designed with holes to allow free flow of electrolyte during the fill process.  The geometry is also designed to be compliant to allow a nominally interference fit.  By centering the valve metal anode within the enclosure, the invention further isolates fragile separator layers from thermal damage from welding.

            Useful immobilizers may be fabricated from a wide range materials with elastic or viscoelastic properties. Example materials include those which are metallic based (stainless steel, titanium, etc.); polymer based (polycarbonate, polyimide, polypropylene, HNBR, PTFE, etc.); ceramic based (silica, zirconia, alumina, etc.); shape memory alloys (SMA) (NiTi, etc.).  SMAs could also allow easier installation in a flat state, thus eliminating the need for complex tooling to pre-compress the component prior to insertion; composites from materials...