NOVELTY - The battery has electrical energy generating elements (1) formed by Lithium cell that is packaged in a sealed envelope. A system for mechanical and thermal conditioning of elements forms a structural body (9) of thermally conductive material. The body has cross-members (12) connecting longerons (10, 11) to form housings (13) in which one of the elements is disposed. The body has a circulation path for a thermal conditioning fluid. The path has longitudinal channels (14, 15) formed in the longeron, where the channels are in fluid communication with passages formed in each of the cross-members.    USE - Electrical battery for supplying an electric motor to drive driving wheels of an electric or hybrid motor vehicle. Can also be used for storing electric power in aeronautical field and in wind turbine.    ADVANTAGE - The system permits mechanical and thermal conditioning of the electrical energy generating elements and maintains the elements in a reinforcement structure, thus ensuring electrical safety of the battery against risks of the temperature, operation of the battery in an optimal range of temperature and safety of the battery related to risks of crash, and hence increasing life duration of the battery. The system forms a structural body of thermally conductive material e.g. aluminum, with reduced weight, thus ensuring mechanical output of the generating elements relative to constraints of crash tests in automobile industry and to mechanical solicitations subjected by the battery. The system permits the dissipation of thermal energy from thermal runaway of the electric energy generating element, without transferring the excess of heat to adjacent electric energy generating elements, thus avoiding risks of propagation of thermal runaway to the battery.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded partial perspective view of a battery with an electrically energy generating element, bus bar and associated electronic card.    Electrical energy generating elements (1)    Structural body (9)    Longerons (10, 11)    Cross-members (12)    Housings (13)    Longitudinal channels (14, 15)