Multi-layered type electrochemistry cell of improved safety

摘要

Disclosed herein is an electrochemical cell constructed in a structure in which a plurality of full cells or bicells, as unit cells, are folded by a separation film formed in the shape of a long sheet, and separators of the unit cells are secured to the separation film by thermal welding. The electrochemical cell according to the present invention has the effect of preventing the electrodes of the stacked electrodes from being separated from the separation film or from being twisted due to external impacts and vibrations, thereby restraining the electrochemical cell from generating heat or catching fire. Furthermore, the structural stability of the electrochemical cell is maintained even when the temperature of the electrochemical cell is increased, or the volume of the electrochemical cell is increased due to the generation of gas.

主权项

1. A multi-layered type electrochemical cell comprising:
a plurality of unit cells, each of the plurality of units cells including a full cell or a bicell, and including one or more separators; a separation film; a first thermal weld on a first side of each of the plurality of unit cells for coupling the one or more separators and the separation film; a second thermal weld on a second side of each of the plurality of unit cells for coupling the one or more separators and the separation film, the second side being opposite the first side.