An electrical power train for a vehicle, the power train comprising an
electrical line (61), a fuel cell (3) connected to the electrical line
(61), an electrical energy management unit (6) comprising a module
controlling the fuel cell, a control device available to the driver of
the vehicle for controlling deceleration of the latter, the control
device being connected to the management unit, at least one electrical
machine (4) connected to at least one driving wheel (40) connected to the
electrical line (61) by means of an electronic module controlling the
electrical machine, the electrical machine (4) being connected to a
second cooling circuit (2) in which a cooling liquid circulates,
independent of the first cooling circuit (1), an electrical dissipation
element (8), and means for ordering the control module of the fuel
battery to stop the process of producing electrical energy while
connecting the said dissipation element (8) to the electrical line (61),
in the event of a deceleration demand and when the management unit (6)
detects that the power absorbed by the loads is less than the power sent
over the electrical line (61).