A battery module having a plurality of battery cells electrically connected to each other, the battery module comprising: a voltage sensing unit comprising voltage sensing terminals electrically connected to electrode terminal connection portions of the battery cells and a conduction part connected to the voltage sensing terminals to transmit voltages detected by the voltage sensing terminals to a module control unit; a signal cutoff unit located between the voltage sensing terminals and the conduction part to interrupt transmission of the detected voltages when a short circuit occurs in the conduction part; characterized in that the battery module further comprises: a cell unit stack comprising two or more hexahedral cell units electrically connected to each other in a stacked state, a module case, in which the cell unit stack is mounted in a state in which the cell unit stack is erected on a side thereof, comprising an upper case and a lower case, which are coupled each other by vertical assembly, and voltage sensing terminals electrically connected to the electrode terminal connection portions of the battery cells, the voltage sensing unit further comprises: sensing unit frames mounted at a front and a rear of the lower case, the voltage sensing terminals are inserted into said sensing unit frames, and conduction part are connected between the voltage sensing terminals, each of the cell units is configured to have a structure including two or more battery cells and a pair of plate-shaped sheathing members coupled to each other to cover the outside of a stack of the battery cells excluding the electrode terminals (110, 120), and each of the cell units further includes a shock-absorbing member interposed at the interface between the battery cells to restrain movement of the battery cells and to absorb shock due to change in volume of the battery cells during charge and discharge of the battery cells, wherein the shock-absorbing member is formed of a porous polymer resin. a voltage sensing unit comprising voltage sensing terminals electrically connected to electrode terminal connection portions of the battery cells and a conduction part connected to the voltage sensing terminals to transmit voltages detected by the voltage sensing terminals to a module control unit; a signal cutoff unit located between the voltage sensing terminals and the conduction part to interrupt transmission of the detected voltages when a short circuit occurs in the conduction part; a cell unit stack comprising two or more hexahedral cell units electrically connected to each other in a stacked state, a module case, in which the cell unit stack is mounted in a state in which the cell unit stack is erected on a side thereof, comprising an upper case and a lower case, which are coupled each other by vertical assembly, and voltage sensing terminals electrically connected to the electrode terminal connection portions of the battery cells, sensing unit frames mounted at a front and a rear of the lower case, the voltage sensing terminals are inserted into said sensing unit frames, and conduction part are connected between the voltage sensing terminals, each of the cell units is configured to have a structure including two or more battery cells and a pair of plate-shaped sheathing members coupled to each other to cover the outside of a stack of the battery cells excluding the electrode terminals (110, 120), and each of the cell units further includes a shock-absorbing member interposed at the interface between the battery cells to restrain movement of the battery cells and to absorb shock due to change in volume of the battery cells during charge and discharge of the battery cells, wherein the shock-absorbing member is formed of a porous polymer resin.