A battery cell frame comprising: a battery cell; a bus bar which is electrically coupled to an electrode lead of the battery cell; a support member which is coupled to the bus bar and with which the battery cell comes into contact to support the battery cell; and a variable length part formed in the support member and which changes in length to fit a size of the battery cell, wherein the variable length part comprises: a first variable length part which changes in length in a short side direction of the support member; and a second variable length part which changes in length in a long side direction of the support member, wherein the first variable length part comprises: a fixed part which is fixedly coupled to one side of the bus bar; and a moveable part which is moveably coupled to the other side of the bus bar at a location facing the fixed part, and wherein the bus bar comprises: an electrical connection part to which the electrode lead of the battery cell is coupled; a first coupling part which extends to one side of the electrical connection part, and to which the fixed part is coupled; and a second coupling part which extends to the other side of the electrical conection part, and to which the moveable part is coupled. a battery cell; a bus bar which is electrically coupled to an electrode lead of the battery cell; a support member which is coupled to the bus bar and with which the battery cell comes into contact to support the battery cell; and a variable length part formed in the support member and which changes in length to fit a size of the battery cell, wherein the variable length part comprises: a first variable length part which changes in length in a short side direction of the support member; and a second variable length part which changes in length in a long side direction of the support member, wherein the first variable length part comprises: a fixed part which is fixedly coupled to one side of the bus bar; and a moveable part which is moveably coupled to the other side of the bus bar at a location facing the fixed part, and wherein the bus bar comprises: an electrical connection part to which the electrode lead of the battery cell is coupled; a first coupling part which extends to one side of the electrical connection part, and to which the fixed part is coupled; and a second coupling part which extends to the other side of the electrical conection part, and to which the moveable part is coupled. a first variable length part which changes in length in a short side direction of the support member; and a second variable length part which changes in length in a long side direction of the support member, wherein the first variable length part comprises: a fixed part which is fixedly coupled to one side of the bus bar; and a moveable part which is moveably coupled to the other side of the bus bar at a location facing the fixed part, and wherein the bus bar comprises: an electrical connection part to which the electrode lead of the battery cell is coupled; a first coupling part which extends to one side of the electrical connection part, and to which the fixed part is coupled; and a second coupling part which extends to the other side of the electrical conection part, and to which the moveable part is coupled. a fixed part which is fixedly coupled to one side of the bus bar; and a moveable part which is moveably coupled to the other side of the bus bar at a location facing the fixed part, and wherein the bus bar comprises: an electrical connection part to which the electrode lead of the battery cell is coupled; a first coupling part which extends to one side of the electrical connection part, and to which the fixed part is coupled; and a second coupling part which extends to the other side of the electrical conection part, and to which the moveable part is coupled. an electrical connection part to which the electrode lead of the battery cell is coupled; a first coupling part which extends to one side of the electrical connection part, and to which the fixed part is coupled; and a second coupling part which extends to the other side of the electrical conection part, and to which the moveable part is coupled.