Battery pack (10), in particular for a motor vehicle, comprising a housing (12) defining an internal cavity (14) for housing several rechargeable electric battery cells (16) arranged one next to the other, characterized in that that said housing comprises at least one tubular or hollow wall delimiting at least one internal space (26) for storing an extinguishing fluid under pressure, said wall comprising a frangible material intended to rupture under the effect of the expansion of the cells of battery linked to the heat generated by a fire or the start of a fire. Figure for the abstract: Figure 8
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