An energy storage device comprises a capacitor having a dielectric between opposite electrodes and a nonconductive coating between at least one electrode and the dielectric. The nonconductive coating allows for much higher voltages to be employed than in traditional EDLCs, which significantly increases energy stored in the capacitor. Viscosity of the dielectric material may be increased or decreased in a controlled manner, such as in response to an applied external stimulus, to control discharge and storage for extended periods of time.

An electrochemical device has a positive electrode, a negative electrode, a negative-electrode terminal, separators, and electrolytic solution, where the positive electrode, negative electrode, and separators are stacked and wound together. The negative-electrode terminal is made of metal, and has a joining part which is a part joined to the principal face of the negative-electrode collector. A protective tape is made of insulating material and attached to the negative electrode to cover the joining part. The negative electrode has a first width along the direction parallel with the axis of winding. The positive electrode has a second width, which is smaller than the first width, along the direction parallel with the axis of winding. The length of the protective tape along the direction parallel with the axis of winding is equal to or greater than the second width.

An electronic component includes an external terminal member made of a conductive metal and an insulating section in contact with the external terminal member. The external terminal member includes an exposed portion which faces outside and which is located on the predetermined surface side thereof. The electronic component is fixed with solder applied to the exposed portion of the external terminal member. The exposed portion of the external terminal member is given by a base plating film made of nickel or a nickel alloy and an outer plating film which is placed on the base plating film and which is made of gold, tin, or an alloy containing at least one of gold and tin. The outer plating film includes a relatively thick region and a relatively thin region surrounding the relatively thick region.

An electronic component includes an external terminal member made of a conductive metal and an insulating section in contact with the external terminal member. The external terminal member includes an exposed portion which faces outside and which is located on the predetermined surface side thereof. The electronic component is fixed with solder applied to the exposed portion of the external terminal member. The exposed portion of the external terminal member is given by a base plating film made of nickel or a nickel alloy and an outer plating film which is placed on the base plating film and which is made of gold, tin, or an alloy containing at least one of gold and tin. The outer plating film includes a relatively thick region and a relatively thin region surrounding the relatively thick region.

The present invention provides an electrode for an electrical device, the electrode comprising: a PTC element; a first terminal disposed on one main surface of the PTC element and extending in one direction; and a second terminal disposed on the other main surface of the PTC element and extending in a different direction from the first terminal.

An electricity storage unit of the present disclosure includes: electricity storage device; holder for holding this electricity storage device; bottomed tubular case for housing electricity storage device and holder; and cover for covering opening of case. At least a part of cover is inserted into case. With this configuration, since a surface on which a joint between cover and case is formed can be disposed on an opening side of case, it is possible to suppress intrusion of a foreign substance, such as a water droplet.

An electricity storage unit of the present disclosure includes: electricity storage device; holder for holding this electricity storage device; bottomed tubular case for housing electricity storage device and holder; and cover for covering opening of case. At least a part of cover is inserted into case. With this configuration, since a surface on which a joint between cover and case is formed can be disposed on an opening side of case, it is possible to suppress intrusion of a foreign substance, such as a water droplet.

A repeatedly bendable power storage device is provided. A highly reliable power storage device is provided. A long-life power storage device is provided. A repeatedly bendable electronic device is provided. A flexible electronic device is provided. The power storage device includes a positive electrode, a negative electrode, and an exterior body wrapping the positive electrode and the negative electrode. The exterior body includes a metal layer and a resin layer. The thickness of the metal layer in at least part of an outer edge of the exterior body is smaller than that in a region other than the outer edge. The exterior body has a plurality of slits in the outer edge.

An energy storage device includes an electrode assembly, a case, a terminal part, and a current collector, wherein the terminal part has: an external terminal having at least a part exposed to outside of the case; a conduction member configured to make the external terminal and the current collector conductive; a decoupling mechanism configured to decouple the conduction member, or hinder a conduction state of the conduction member; and an auxiliary terminal disposed spaced from the external terminal, and having at least a part exposed to the outside of the case, the auxiliary terminal being electrically connected to the current collector.

An energy storage device includes an electrode assembly, a case, a terminal part, and a current collector, wherein the terminal part has: an external terminal having at least a part exposed to outside of the case; a conduction member configured to make the external terminal and the current collector conductive; a decoupling mechanism configured to decouple the conduction member, or hinder a conduction state of the conduction member; and an auxiliary terminal disposed spaced from the external terminal, and having at least a part exposed to the outside of the case, the auxiliary terminal being electrically connected to the current collector.