ELECTROCHEMICAL CELL

PROBLEM TO BE SOLVED: To provide an electrochemical cell that can be efficiently disposed on a substrate since it has no projection such as a terminal.SOLUTION: A lidded vessel is formed from a bottomed prismatic vessel, a metal ring positioned along the upper end fringe of the vessel, and a lid located in the upper part of the metal ring, and two positive and negative connection terminals are taken out from the lidded vessel. One end of one connection terminal is connected to the metal ring, and the other end thereof is positioned on the lower face of the bottom plate of the bottomed prismatic vessel. One end of the other connection terminal is positioned in the inside of the bottom plate of the vessel, and the other end thereof is positioned on the lower face of the bottom plate of the bottomed prismatic vessel. The connection terminal positioned in the inside of the bottom plate of the vessel can be electrically connected to the inside of the lidded vessel. A positive electrode active material, a negative electrode active material, an electrolyte, and a separator for separating the positive electrode active material from the negative electrode active material is housed in the inside of the vessel.