ASSEMBLY COMPRISING A PLURALITY OF ELECTROCHEMICAL CELLS AND ELECTRICAL DEVICE COMPRISING SUCH AN ASSEMBLY

The invention relates to an assembly (12) comprising: - a stack comprising a plurality of electrochemical cells (22) arranged along a longitudinal direction (X) and a plurality of insulating layers (24), and - a housing (26) defining a compartment in which the stack (20) is received. The stack (20) further comprises intumescent means (28) arranged according to the longitudinal direction (X) between two adjacent electrochemical cells (22), the intumescent means (28) being capable of swelling when subjected to a temperature higher than a swelling temperature. The housing (26) comprises at least one breakable part (40) configured to break under the effect of swelling of the intumescent means (28).