| 摘要 |
A flat capacitor and a method of making the flat capacitor, the capacitor having a one-piece metal foil case. The capacitor includes a metal foil case with a flange, the case being made of a blank that is folded onto itself so the peripheral flanges are brought into mutual contact and welded. A lead extends from an anode within the capacitor through a hole in the capacitor case in the fold. An elastomeric body inserted in the hole and surrounding the lead provides electrical insulation and a seal is produced when the metal foil blank is folded to close the case of the capacitor. Preferably, the anode is a wet slug anode, such as sintered tantalum having an oxide coating, and the inside surface of the metal foil case is preferably coated with a porous metal oxide, such as ruthenium oxide, providing a capacitor with high energy storage density and breakdown voltage.
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