Abstract: A positive electrode includes: a positive electrode current collector including an inner peripheral surface and an outer peripheral surface; an inner periphery side positive electrode active material layer; and an outer periphery side positive electrode active material layer. A negative electrode includes: a negative electrode current collector including an inner peripheral surface and an outer peripheral surface; an inner periphery side negative electrode active material layer; and an outer periphery side negative electrode active material layer. An innermost wind portion of the negative electrode is located on an inner side relative to an innermost wind portion of the positive electrode. An inner periphery side edge of the outer periphery side negative electrode active material layer is located closer to a central axis of a wound electrode body than an inner periphery side edge of the inner periphery side negative electrode active material layer.

Abstract: A secondary battery includes a wound electrode body, positive and negative electrode current collector plates, an electrolytic solution, and a battery can. The wound electrode body includes a stack in which positive and negative electrodes are stacked with a separator therebetween. The stack is wound around a central axis. The positive electrode current collector plate faces a first end face of the wound electrode body and is coupled to the positive electrode. The negative electrode current collector plate faces a second end face of the wound electrode body and is coupled to the negative electrode. In the wound electrode body, a positive electrode edge of an innermost wind portion of the positive electrode is located on an inner side relative to a negative electrode edge of an innermost wind portion of the negative electrode. The positive electrode edge includes an inclined portion inclined with respect to the central axis.

Abstract: A dielectric substrate is provided on both its main surfaces with conductors each having two circular openings such that the openings on both main surfaces oppose each other. On one conductor of the dielectric substrate, an insulating layer is formed. On the insulating layer, an input electrode and an output electrode are formed. Electrically conductive plates are disposed and secured such that they sandwich the dielectric substrate with gaps therebetween.