▎ 摘　　要

NOVELTY - Electrochemical device comprises an electrode assembly and a shell, where the electrode assembly is set in the shell. The shell comprises a packaging film and a first layer. The packaging film is containing cavity. The first layer is set on the surface of the packaging film away from the containing cavity the first layer comprises a high molecular compound and a carbon material. The high molecular compound comprises an aromatic heterocyclic compound. USE - Electrochemical device. ADVANTAGE - The electrochemical device enhances the Young's modulus and size stability of the whole shell, so as to inhibits the expansion of the electrode assembly, reduces the electrochemical device in the circulating process, and improves the performance of the electrochemical device.