TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: A pressure distribution plate is arranged between the heat-exchanging pouch and the pressure pouch. A flow-guiding baffle is enclosed in the heat-exchanging pouch. A flow-dividing longitudinal web is provided which runs at least approximately parallel to the longitudinal edges of the heat-exchanging pouch, such that the inflow into the heat-exchanging pouch and the outflow occur in the form of two mutually parallel heat carrier medium, where the inflow-side and outflow-side longitudinal webs are connected to one another via a dividing web, and the dividing web delimits two groups of transverse ducts of the heat-exchanging pouch. A longitudinal web which connects the transverse webs to one another at their ends in ladder-shaped form has a smaller cross-sectional height than the transverse webs, such that the regions of the longitudinal web which extend between the transverse webs form a dam web. A circular opening is provided in one of the walls of the heat-exchanging pouch for the inflow and outflow, where openings are spaced apart from one another and a connection nozzle is sealingly inserted into openings such that the connection nozzles are oriented perpendicular to the plane of the heat-exchanging pouch. A sealed connection is conducted between the respective pouch wall and the circumference of a connection nozzle by adhesive bonding or welding by a nozzle edge which is integrally formed on the connection nozzle and which projects along a plate edge or along a flange. The foil walls of the heat-exchanging pouch are welded or adhesively bonded to a supporting frame which forms flow-guiding baffle, where supporting frame has an outer frame corresponding in size to the outer contour of the heat-exchanging pouch. The connection nozzles of the heat-exchanging pouch are formed integrally on the supporting frame. A trough-shaped duct piece is provided between the supporting frame and the connection nozzle of the heat-exchanging pouch, the edge of which duct piece runs in the same plane as the outer frame. A row of dam bodies is provided at and/or downstream of transverse ducts of the heat-exchanging pouch. The object is battery, which has bar cells, where end-side contacts of the battery are in each case connected electrically in parallel and in series with one another by means of a common contact plate, and a heat-exchanging pouch has multiple contact plates, and at least wall of the heat-exchanging pouch which faces toward the contact plates is composed of a multi-layer foil material which has an electrically insulating layer, on the side bearing against the contact plate. The electrically interconnected bar cells are grouped in parallel with one another and in multiple layers arranged one above the other, where heat-exchanging pouch is provided between each of the adjoining layers and also on the outside on the outer layers. The connection nozzles provided on each of the mutually parallel heat-exchanging pouches are arranged one above the other on the same axis in the region of a face-end side surface of the battery, and are connected via a T-shaped branch or 90 degrees elbow to a common connection line running parallel to the side surface. The spacing between the foil walls of the heat-exchanging pouch is less than 2 mm. The foil walls of the heat-exchanging pouch have thickness of less than 0.2 mm.