Battery module (M), comprising: - a plurality of accumulators, in particular of prismatic geometry (A1, A2...AN+1), each comprising at least one electrochemical cell C formed by a cathode , an anode and an electrolyte interposed between the cathode and the anode, and a flexible package arranged to contain the electrochemical cell in a sealed manner while having passing through it a portion of two tabs that form the poles or terminals which extend in the plane of the electrochemical cell; - a plurality of blind frames (10.1, 10.2...10.N+1) that are elongate in a longitudinal direction (X) and lateral direction (Y), each blind frame forming a support with housing for one of the plurality of accumulators, the supports being stacked and fixed to one another in a stacking direction (Z) orthogonal to the directions (X,Y), each support internally comprising, along one of its longitudinal edges and/or lateral edges , connecting means for interlocking with at least one adjacent support through complementing shapes; the connecting means being arranged so as not to project outside the stack once the interlocking connections have been made; - a plurality of pairs of metal strips , each pair of strips being inserted into a housing formed in one of the lateral edges and/or longitudinal edges of one of the supports to form a pair of lugs, one portion of each lug being in pressing contact with a pole or terminal of one of the accumulators while another portion of each lug is in pressing contact with an adjacent lug portion within the stack, the pressing contacts within the stack of supports being obtained by the interlocking connections of adjacent supports through complementing shapes. - a plurality of accumulators, in particular of prismatic geometry (A1, A2...AN+1), each comprising at least one electrochemical cell C formed by a cathode , an anode and an electrolyte interposed between the cathode and the anode, and a flexible package arranged to contain the electrochemical cell in a sealed manner while having passing through it a portion of two tabs that form the poles or terminals which extend in the plane of the electrochemical cell; - a plurality of blind frames (10.1, 10.2...10.N+1) that are elongate in a longitudinal direction (X) and lateral direction (Y), each blind frame forming a support with housing for one of the plurality of accumulators, the supports being stacked and fixed to one another in a stacking direction (Z) orthogonal to the directions (X,Y), each support internally comprising, along one of its longitudinal edges and/or lateral edges , connecting means for interlocking with at least one adjacent support through complementing shapes; the connecting means being arranged so as not to project outside the stack once the interlocking connections have been made; - a plurality of pairs of metal strips , each pair of strips being inserted into a housing formed in one of the lateral edges and/or longitudinal edges of one of the supports to form a pair of lugs, one portion of each lug being in pressing contact with a pole or terminal of one of the accumulators while another portion of each lug is in pressing contact with an adjacent lug portion within the stack, the pressing contacts within the stack of supports being obtained by the interlocking connections of adjacent supports through complementing shapes. <EOS>