The invention relates, amongst others, to a feedthrough pin of an electrolytic capacitor for contacting an electrode of the electrolytic capacitor and providing an electrical contact of the electrolytic capacitor on an outside of the electrolytic capacitor, the feed-through pin comprising a longitudinally extending body. According to an aspect of the invention, a first circumferential protrusion is arranged between a first section of the longitudinally extended body and a second section of the longitudinally extended body, wherein the first circumferential protrusion runs around a longitudinal axis of the longitudinally extended body and extends radially outwards over an outer contour of the first section of the longitudinally extended body and an outer contour of the second section of the longitudinally extended body.

A wet tantalum electrolytic capacitor containing a cathode, fluidic working electrolyte, and anode formed from an anodically oxidized sintered porous tantalum pellet is provided. The pellet is formed from a pressed tantalum powder. The tantalum powder is formed by reacting a tantalum oxide compound, for example, tantalum pentoxide, with a reducing agent that contains a metal having an oxidation state of 2 or more, for example, magnesium. The resulting tantalum powder is nodular or angular and has a specific charge that ranges from about 11,000 μF*V/g to about 14,000 μF*V/g. Using this powder, wet tantalum electrolytic capacitors have breakdown voltages that ranges from about 250 volts to about 400 volts. This makes the electrolytic capacitors ideal for use in an implantable medical device.

A very high capacity capacitor or energy storage comprising a two-layer electrode structure with a separator and an electrolytic fluid, where the electrodes are parallel and connected to one of two terminals. The electrodes are connected to the terminal along a large length so that the connection to the terminal has a low resistance and so that charging may take place faster and with less heat generation.

A very high capacity capacitor or energy storage comprising a two-layer electrode structure with a separator and an electrolytic fluid, where the electrodes are parallel and connected to one of two terminals. The electrodes are connected to the terminal along a large length so that the connection to the terminal has a low resistance and so that charging may take place faster and with less heat generation.

An energy storage device including: an electrode assembly and a positive electrode current collector, wherein the positive electrode current collector includes an electrode connecting portion connected to the electrode assembly, the electrode connecting portion includes a first portion and a second portion which has a smaller wall thickness than the first portion and is joined to the electrode assembly, and either one of the second portion or the electrode assembly includes a first convex portion projecting toward the other in a joined portion.

An energy storage device including: an electrode assembly and a positive electrode current collector, wherein the positive electrode current collector includes an electrode connecting portion connected to the electrode assembly, the electrode connecting portion includes a first portion and a second portion which has a smaller wall thickness than the first portion and is joined to the electrode assembly, and either one of the second portion or the electrode assembly includes a first convex portion projecting toward the other in a joined portion.

An improved capacitor is provided wherein the capacitor has an improved bond between the anode and anode wire. The anode comprises a pressed anode powder comprising a first density region and a second density region wherein the second density region has a higher density than the first density region. An anode wire extends into the second density region wherein the anode wire in the second density region is distorted by compression. This allows for better utilization of the metal powder surface area by allowing a lower bulk press density and lower sinter temperature while still achieving the necessary wire pull strength. In addition, this invention when utilized with deoxidation steps, results in sufficient wire pull strengths not possible otherwise.

An improved capacitor is provided wherein the capacitor has an improved bond between the anode and anode wire. The anode comprises a pressed anode powder comprising a first density region and a second density region wherein the second density region has a higher density than the first density region. An anode wire extends into the second density region wherein the anode wire in the second density region is distorted by compression. This allows for better utilization of the metal powder surface area by allowing a lower bulk press density and lower sinter temperature while still achieving the necessary wire pull strength. In addition, this invention when utilized with deoxidation steps, results in sufficient wire pull strengths not possible otherwise.

Provided is a connection structure for connecting electrodes of a plurality of capacitors, including: a circuit board that includes power source patterns and through holes into which the electrodes are inserted, the circuit board being placed on the capacitors; bolts that include shaft portions that are inserted into the through holes and are screwed into the electrodes of the capacitors and head portions that are formed integrally with the shaft portions and press the power source patterns to the electrodes via the circuit board, and spacer portions that are arranged in the through holes and support the bolts.

Provided is a connection structure for connecting electrodes of a plurality of capacitors, including: a circuit board that includes power source patterns and through holes into which the electrodes are inserted, the circuit board being placed on the capacitors; bolts that include shaft portions that are inserted into the through holes and are screwed into the electrodes of the capacitors and head portions that are formed integrally with the shaft portions and press the power source patterns to the electrodes via the circuit board, and spacer portions that are arranged in the through holes and support the bolts.