Electrochemical device

An electrochemical device adapted to be mounted by soldering, comprising:

• an electric storage element;
• a package having the electric storage element sealed therein;
• and at least one pair of terminals where parts of the terminals are led out from the electric storage element and sealed inside the package together with the electric storage element, and other parts are led out to the outside of the package and exposed;
• wherein increased thermal resistance sections are provided on the parts of the terminals for inhibiting heat generated by soldering from transferring to the electric storage element, through the terminals, from the other parts of the terminals, wherein each increased thermal resistance section is disposed in a portion inward from the exposed part of each terminal, and the increased thermal resistance section is constituted by a section thinner than a section of the terminal at a boundary of the exposed and non-exposed parts of the terminal, a bent section relative to a direction in which the terminal is led out from the boundary to the outside of the package, or a skewed section relative to the direction, wherein the package has a sealed section, the other parts of the terminals are led out to the outside of the package through the sealed section, and the increased thermal resistance sections are positioned entirely away from the sealed section.