Battery unit with temperature-regulating means built into the housing

The invention relates to a battery unit (), particularly for a hybrid and/or electric motor vehicle, comprising a plurality of cells that are physically and/or electrically regrouped into a plurality of modules, a housing receiving and surrounding said cells, and means for regulating the temperature of said cells by circulation of a heat-transfer fluid. Said battery unit () is characterised in that the housing is made of a plastic material and consists of a lower tray (), with a bottom and side walls, and an upper cover (), which are peripherally assembled, and in that at least the tray () comprises means () for distribution/collection and circulation of the heat-transfer fluid, said means being structurally built into the body of said tray (), by being formed at least partially as one piece therewith.