Battery module comprising: - a plurality of accumulators, in particular of prismatic geometry (A1, A2...AN) each comprising at least one electrochemical cell C formed of a cathode, an anode and an electrolyte intercalated between the cathode and the anode, and a flexible packaging arranged to contain the electrochemical cell in a sealed manner while at the same time being passed through by a part of two tabs (4, 5), forming the poles or terminals that extend in the plane of the electrochemical cell; - a plurality of blind frames (10.1, 10.2...10.N), which are elongate in a longitudinal and lateral direction, each blind frame forming a holder with a housing for one of the plurality of accumulators, the holders being stacked and secured to one another in a stacking direction orthogonal to the directions (X,Y), each holder comprising internally, along one of its longitudinal (12,14) and/or lateral (11, 13) edges, means for mechanical connection with at least one adjacent holder; characterized by - a plurality of pairs of metal bars, each metal bar of a pair being inserted in a housing formed in one of the lateral and/or longitudinal edges of one of the holders so as to form a lug, a portion of each lug being in contact with a pole or terminal of one of the accumulators; - a pair of metal plates each forming a busbar that extends in the stacking direction, each busbar being welded to one of the lugs of each pair of lugs, each busbar comprising at least one thinned zone forming a rupture line (L1, L2, L3) at least one of which is arranged facing one and/or the other of two adjacent blind frames, each rupture line being dimensioned so as to rupture in the event of swelling, beyond a predetermined volume, of an accumulator in one and/or the other of two adjacent blind frames in such a way as to interrupt the electrical current flowing in the module. - a plurality of accumulators, in particular of prismatic geometry (A1, A2...AN) each comprising at least one electrochemical cell C formed of a cathode, an anode and an electrolyte intercalated between the cathode and the anode, and a flexible packaging arranged to contain the electrochemical cell in a sealed manner while at the same time being passed through by a part of two tabs (4, 5), forming the poles or terminals that extend in the plane of the electrochemical cell; - a plurality of blind frames (10.1, 10.2...10.N), which are elongate in a longitudinal and lateral direction, each blind frame forming a holder with a housing for one of the plurality of accumulators, the holders being stacked and secured to one another in a stacking direction orthogonal to the directions (X,Y), each holder comprising internally, along one of its longitudinal (12,14) and/or lateral (11, 13) edges, means for mechanical connection with at least one adjacent holder; characterized by - a plurality of pairs of metal bars, each metal bar of a pair being inserted in a housing formed in one of the lateral and/or longitudinal edges of one of the holders so as to form a lug, a portion of each lug being in contact with a pole or terminal of one of the accumulators; - a pair of metal plates each forming a busbar that extends in the stacking direction, each busbar being welded to one of the lugs of each pair of lugs, each busbar comprising at least one thinned zone forming a rupture line (L1, L2, L3) at least one of which is arranged facing one and/or the other of two adjacent blind frames, each rupture line being dimensioned so as to rupture in the event of swelling, beyond a predetermined volume, of an accumulator in one and/or the other of two adjacent blind frames in such a way as to interrupt the electrical current flowing in the module.