ELECTROCHEMICAL ENERGY STORAGE DEVICE

摘要

The present invention provides an electrochemical energy storage device comprising: a battery core, electrolyte and a packaging shell. The electrochemical energy storage device further comprises glue material located between the battery core and the packaging shell. The glue material comprises an adhesive layer and a protective layer. The adhesive layer is directly or indirectly bonded to the outer surface of the battery core, and the side of the adhesive layer away from the battery core is an adhesive surface; the protective layer is disposed on the adhesive surface of the adhesive layer, and the protective layer is wholly or partially dissolved or swollen in the electrolyte to expose the adhesive surface of the adhesive layer, and then the adhesive layer bonds the battery core and the packaging shell together. The protective layer is of polar molecule, wherein the polar molecule comprises one or more of -F, -CO-NH-, -NH-CO-NH- and -NH-CO-O-. The electrochemical energy storage device of the present invention can not only achieve a fixed connection between the battery core and the packaging shell, solve various problems occurred during the drop test, but also avoid the difficulty of the battery core entering the packaging shell caused by both sticky sides of the glue material, and has good cycle performance and high rate charge-discharge performance.