Provided is a battery module comprising: a battery cell arrangement in which two or more battery cells are stacked, each battery cell having therein an electrode assembly and an electrolyte sealed in a battery case, wherein the electrode assembly comprises positive and negative terminals and a separation membrane interposed therebetween; and fixing members, integrally coupled to the exterior surface of each battery cell, for fixing battery cells so as to form the stacked battery cell structure, wherein one or more fixing members from among the fixing members are characterized by having a venting guidance portion, in which the outer surface of the battery cell is exposed so that the seal of the battery case can be broken when the internal pressure of the battery cell rises.