Battery Assembly and Method of Assembling the Same

A battery assembly and a method of assembling the same are provided. The battery assembly includes a plurality of battery cells arranged along a stacking direction, a receiving case forming a receiving space for receiving the plurality of battery cells, a plurality of flame-retardant members disposed between one surface of the receiving case and the plurality of battery cells, a partition portion located between the plurality of flame-retardant members along the stacking direction to separate the plurality of flame-retardant members from each other, and a plurality of venting holes penetrating the one surface of the receiving case and disposed so as to overlap the plurality of flame-retardant members.