▎ 摘　　要

NOVELTY - Electrochemical device comprises an electrode assembly, a heating component and a shell. The electrode assembly comprises a first pole piece. The heating component comprises a heating part and a first conductive piece, where the heating part is located in the shell, the first conductive piece comprises a first part and a second part, where the first part comprises a first connection area connected with the heating part, the second part extends out of the shell, where the heating component satisfies at least one of the following conditions, where the first part further comprises a second connection area connected with the first pole piece or the heating part comprises a third connecting area connected with the first pole piece. The heating element comprises at least one of a metal material or a carbon material and the insulating layer comprises at least one of a polymer or an inorganic insulating material. USE - The electrochemical device is useful in electric device (claimed). ADVANTAGE - The electrochemical device has the pole piece and the heating part are respectively connected to the conductive parts and connects outside the shell thus reduces the use of inactive conductive parts and high energy density; and provides reduced risk of connection falling off and energy loss of the conductive member outside the shell when the electric energy stored is used for heating.