Battery Assembly

The present disclosure relates to a battery assembly comprising: a plurality of battery cells stacked and arranged with each other; a bus bar assembly, at least a portion of which is positioned on one side of the plurality of battery cells and electrically connected to the plurality of battery cells; a case accommodating the plurality of battery cells and the bus bar assembly; an accommodating space positioned between the bus bar assembly and the plurality of battery cells inside the case; and a solid filler inserted into the accommodating space.