NOVELTY - The battery comprises rod cells (7) arranged in rows next to one another, end-side electrical contacts, which are each electrically connected to one another in parallel and in series by a common contact plate (16), and a flat heat exchange pocket (19) through which a heat transfer medium flows against the contact plates for effective cooling. The pocket consists of a multilayer thin film having an electrically insulating outer layer, is present direct contact with the electrically connecting the contact plate, and includes a multilayer sheet material.    USE - The battery is useful in an electrical vehicle.    ADVANTAGE - The battery can be economically manufactured with high performance and productivity and compact size.    DETAILED DESCRIPTION - The battery comprises rod cells (7) arranged in rows next to one another, end-side electrical contacts, which are each electrically connected to one another in parallel and in series by a common contact plate (16), and a flat heat exchange pocket (19) through which a heat transfer medium flows against the contact plates for effective cooling. The pocket consists of a multilayer thin film having an electrically insulating outer layer, is present direct contact with the electrically connecting the contact plate, and includes a multilayer sheet material. Each of the common contact plates extends over the entire length of the parallel extending rows of rod cells so that the contact plates are provided at both ends of the rod cells and are electrically and mechanically connected to each other in parallel and series. Poles of the rod cells are connected to the contact plate at a welding point by laser scanner welding. The rod cells are attached through the contact plates with a gap between the cells. The heat exchange pocket includes a flow guide grid located between its film walls. A compressible medium pressure pocket is provided parallel to the heat exchange pocket. The rod cells include superimposed outer cell blocks (3). The cell blocks are provided with heat exchange pocket. The heat exchange pockets are provided in connection pieces coaxially arranged above one another in a region of a front side face of the battery, and T-shaped connections or 90 degrees manifolds are connected by common connecting lines. One of the connecting lines includes an electric heater. The heat exchange pocket includes inner and outer containers provided with a stiffening layer. A pressure distribution plate is arranged between the film wall and the inner container. The insulating material includes a granular material. A closure wall of the inner container forms a cap. A closure cover of the outer container includes a granular material.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic perspective view of a battery.    Housing (2)    Cell blocks (3)    Rod cells (7)    Contact plate (16)    Flat heat exchange pocket. (19)