Abstract: The invention relates to a floor structure (1) for an electric-powered motor vehicle successively comprising, from bottom to top: a battery (2) arranged in a tray (3), a floor plate (5) facing said battery and an acoustic trim lining (6) arranged on said plate, said structure further comprising a fibrous and porous thermal protection layer (7) arranged between said lining and said plate, said protection layer comprising thermal protection fibers based on at least one fusible material and structural fibers of one or more types, said fibers being infusible or based on material having a melting point greater than the maximum melting point of said protection fibers.

Abstract: The invention relates to an acoustic sheild having a thermo-compressed shell based on fibres bound together by a thermoplastic binder to form a porous shell that has noise absorption properties. The shell has an internal face and an external face, and a sheet of metal for thermal protection against the engine. The sheet covers all or part of the internal face, the sheet is attached in a substantially fluidtight manner, essentially via its periphery to the shell. This creates a peripheral seal and maintains, except at the periphery, an air gap between the sheet and the shell, to protect the shell from the heat accumulated by the sheet.