An electrolytic capacitor includes an anode body having a dielectric layer; a solid electrolyte layer in contact with the dielectric layer of the anode body; and an electrolytic solution. The electrolytic solution contains a solvent and a solute. The solvent contains a glycol compound. The solute contains an acid component. The acid component contains a first aromatic compound having a hydroxyl group. A proportion of the first aromatic compound in the acid component ranges from 30% by mass to 100% by mass, inclusive.

A wiring module that is to be attached to a unit cell group in which a plurality of unit cells that each have positive and negative electrode terminals are arranged, including a plurality of basic units arranged in a direction in which the unit cells are arranged. Each of the plurality of basic units includes: a bus bar configured to electrically connect the electrode terminals of two adjacent unit cells to each other; an electrical wire that is to be electrically connected to the unit cells to detect a state of the unit cell group; a fuse configured to electrically connect the bus bar and the electrical wire to each other, and prevent an overcurrent; and a housing provided with a fuse opening into which the fuse is inserted, and a bus bar opening into which the bus bar is inserted. The fuse opening opens in a direction in which the bus bar extends.

A capacitor, a capacitor package structure, and a method of the manufacturing the capacitor are provided. The capacitor includes a conductive polymer material. The conductive polymer material is made of a solution containing a plurality of conductive polymer particles. A particle size of each of the conductive polymer particles is at least smaller than 30 nm, so that the capacitance decay may less than 10% when the capacitor receives a surge current. In addition, the capacitor package structure includes a conductive polymer material. The conductive polymer material is made of a solution containing a plurality of conductive polymer particles. The particle size of the conductive polymer particle is at least smaller than 30 nm, so that the capacitance decay may less than 10% when the capacitor package receives a surge current.

An ultracapacitor that is in contact with a hot atmosphere having a temperature of about 80 C. or more is provided. The ultracapacitor contains a first electrode, second electrode, separator, nonaqueous electrolyte, and housing is provided. The first electrode comprises a first current collector electrically coupled to a first carbonaceous coating and the second electrode comprises a second current collector electrically coupled to a second carbonaceous coating. The capacitor exhibits a capacitance value within the hot atmosphere of about 6 Farads per cubic centimeter or more as determined at a frequency of 120 Hz and without an applied voltage.

A layer of the mixture that contains polymer and conductive particles is applied over a first surface, when the mixture has a first viscosity that allows the conductive particles to rearrange within the layer. An electric field is applied over the layer, so that a number of the conductive particles are aligned with the field and thereafter the viscosity of the layer is changed to a second, higher viscosity, in order to mechanically stabilise the layer. This leads to a stable layer with enhanced and anisotropic conductivity.

An energy storage apparatus includes: an energy storage device which includes an electrode terminal; an outer case; and an external connection terminal. The external connection terminal includes: an external connection part to be connected to an external conductive member; a circuit breaking part; and a bus bar which connects the electrode terminal or the external connection part with the circuit breaking part, and which is formed in the outer case by insert molding. The bus bar includes an outer exposed portion on which the circuit breaking part is detachably mounted from the outside of the outer case.

An electrolytic capacitor includes an anode body having a dielectric layer; a solid electrolyte layer in contact with the dielectric layer of the anode body; and an electrolytic solution. The electrolytic solution contains a solvent and a solute. The solvent contains a glycol compound. The solute contains an acid component and a base component. A mass of the acid component in the solute is greater than a mass of the base component in the solute. The acid component contains a first aromatic compound having a hydroxyl group.

An electrolytic capacitor includes a capacitor element, a case housing the capacitor element, and a first heat radiation layer having an insulating property. The first heat radiation layer covers at least part of the capacitor element. A thermal conductivity .sub.C of the case in a thickness direction is greater than or equal to 1 W/m.Math.K. A thermal emissivity .sub.1 of the first heat radiation layer is greater than or equal to 0.7.

An electric component includes a substrate, a first component, a second component, and a heat sink. The substrate has a first surface and a second surface opposite to the first surface. The first component is disposed on a side of the first surface. The second component includes a body disposed on a side of the second surface, and a lead that extends from the body through the second surface to the first surface. The beat sink is disposed on the side of the first surface, and is used in common for dissipation of heat from the body through the lead and dissipation of heat from the first component.

An electronic unit includes an electrolytic capacitor, a covering resin layer, and electronic components. The electrolytic capacitor is on an upper surface of an insulating substrate. The covering resin layer covers the upper surface of the insulating substrate and the electronic components. Part of the covering resin layer serves as an electrolytic capacitor covering portion. The electrolytic capacitor covering portion includes an outer peripheral covering portion that covers an outer peripheral surface of the electrolytic capacitor and a top covering portion that covers a top portion of the electrolytic capacitor. A thin wall groove is formed in the top covering portion. The outer peripheral covering portion extends upward beyond the top covering portion by a height h. The top covering portion easily breaks at the thin wall groove so that an explosion-proof valve easily operates. A region corresponding to the height h creates an operating space of the explosion-proof valve.