Battery module including flame-retardant sheet, and battery rack and energy storage system including the same

Abstract

A battery module includes at least one cell assembly including a plurality of secondary batteries, each of which has an electrode lead, a module housing having an inner space formed to accommodate the cell assembly therein, a bus bar assembly including at least one electrically conductive bus bar having a plate shape and configured to contact a portion of the electrode lead, and at least one electrically insulating bus bar frame to which the at least one bus bar is mounted, the at least one bus bar frame having a plurality of perforated holes through which the electrode leads of the plurality of secondary batteries passes and a flame-retardant sheet having a plate shape and located in close contact with an outer side of the bus bar to close the perforated hole.