NOVELTY - The module (1) has two horizontal heat conducting plates (5a, 5b) placed in parallel and relative to each other. Inter-connected electrochemical energy storage cells (C1-C15) are placed one against the other between the plates to form an alignment in orthogonal direction with the plates. One of the plates includes a heat pipe (2a) comprising an internal section (21a) extending inside from the plate and in contact with the alignment and an external section (22a) extending outside the plate and in contact with fluid circulating outside the module.    USE - Integral module for cooling and heating a battery i.e. traction battery, of a motor vehicle (all claimed) e.g. electric car and electric hybrid car.    ADVANTAGE - The module allows cooling or heating the cells according to the need while assuring improved energy performance of the heat pipe by making the capacity of conduction of the heat pipe to be 10 to 100 times better than that of copper bar, ensuring better compactness by integrating the heat pipes in the plates, and providing triple-function including optimal conduction of heat toward or from the heat pipes, mechanical resistance of the module, and insulation between the heating or cooling elements and electric connector elements between the cells and the module. The module can be extended in horizontal direction so as to facilitate integration of a battery pack under or behind a rear seat of the vehicle. The module avoids risk of dangerous gas toward a passenger compartment. The module arranges a condensing section above a evaporation section so as to provide better thermal performance while authorizing the use of the heat pipes at low cost without capillary action grooves, thus reducing obstruction of the module.    DETAILED DESCRIPTION - The plates are assembled with each other by bolting screws (3a-3d) that compresses the alignment of the cells between the plates.    DESCRIPTION OF DRAWING(S) - The drawing shows a top view of a battery module.    Electrochemical energy storage cells (C1-C15)    Battery integrated module (1)    Heat pipe (2a)    Bolting screws (3a)    Plates (5a, 5b)    Internal section (21a)    External section (22a)