TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The battery cells are formed in a plate-shaped manner and have a plate upper side, plate lower side and a front side with two contact electrodes. The battery cell at the upper side and the lower side per layer is completely covered by a foil-like pocket walls and is enclosed as side edges surrounding the battery cells with the exception of the front side hermetically from the reception structure. The battery cells are formed in elongated rod-shaped or cylindrical-shaped manner, have a longitudinal axis and a front side with two contact electrodes, are arranged with parallelly oriented longitudinal axes per layer of two battery cells and are arranged in same orientation with respect to their front sides. Two battery cells are sub-divided into an upper- and a lower half-plane by a separating plane, which is clamped through the longitudinal axes of the two battery cells, where the surfaces of the battery cells associated in the upper half-plane and the surfaces of the battery cells associated in the lower half-plane are partially covered by a foil-like pocket wall in a conformal manner. A first edge area and a second edge area of the pocket walls, which are formed oppositely in the stack in a foil-like manner, are directly or indirectly connected with one another in a fluid-tight manner, where the first edge area is turned towards the front side between the two layers, the second edge area is opposite to the first edge area and the first and second edge areas laterally fluid-tightly close the passage channel between the layers. A first edge area and a second edge area of the pocket walls, which are formed oppositely in the stack in a foil-like manner, are directly or indirectly connected with one another in a fluid-tight manner, where the first edge area is turned towards the front side between the two layers, the second edge area is opposite to the first edge area and the first and second edge areas laterally fluid-tightly close the passage channel between the layers. The pocket walls foil-like enclosing the passage channel are structured to the sides of the passage channel. A phase changing material storing heat is introduced in the passage channel. The reception structure consists of plastic or plastic-metal hybrid material composite. A housing surrounding the reception structure comprises the receiving pockets and directly or indirectly supports the receiving pockets transverse to the pocket wall extension. The individual passage channel is surrounded by a tube section produced from a fluid-tight material. The two distribution units (6, 7) are provided in the tube section, enclose a volume in which a pipeline flows for introducing or discharging the tempering agent, and have openings arranged to each other with an interval, where n tube sections are arranged between the distribution units and fluid-tightly connect one of the n openings of the one distribution unit with one of the n openings of the other distribution unit, so that tow adjacently arranged tube sections form a receiving pocket. The tube sections consist of elastomeric material. The pocket walls of the receiving pocket correspond to a surface section of two directly adjacently arranged tube sections. The tube sections are liquid-tightly connected to the openings of both distribution units in a way of a material connection, a molding connection and/or a clamping closure connection. The openings are formed as elongated holes in the distribution units. A phase changing material storing heat is contained in the liquid-tight material of the tube sections. The filling materials increasing the thermal conductivity are contained in the liquid-tight material of the tube sections. The tube sections enclosing one passage channel area-wisely have a structured surface turned towards the passage channel in the inner wall. A circulating and/or a passage body are introduced inside one tube section. A housing is provided in both distribution units, consists of a housing body and a housing lid, and encloses n tube sections, where the housing body of the both distribution units comprises n tube sections at one side in an opened manner, so that a free access exists for insertion of battery cells into the receiving pockets transverse to the longitudinal extension of the tube section, The housing lid provides passage openings for the pipelines for introducing and discharging of the tempering unit. The two frame elements include one receiving pocket by joining, where one frame element has a membrane-like surface area, which has an upper- and a lower membrane surface area. The upper membrane surface is completely limited at its peripheral circumferential edge by a limiting rib overtopping the membrane surface. The upper membrane surface is completely limited at its peripheral circumferential edge by a limiting rib overtopping the membrane surface. The lower membrane surface is limited at its two opposing side areas of the membrane-like structure by an edge web overtopping the lower membrane surface, where the edge web is formed in a rib-like manner. A groove-shaped recess brought in the edge web openly flows to an edge web side turned away from the lower membrane surface, and is fluidically connected with a membrane opening flowing at the upper membrane surface in a communicating manner. The joining step takes place for forming the receiving pocket by joining two frame elements along their rib-like edge webs. The passage channel flowable by the tempering medium is enclosed at the limiting rib of the frame elements bearing in the joining composite by fluid-tightly joining a covering plate or further frame element along its limiting rib, where the frame elements limit the receiving pocket. The reception structure having the receiving pockets provides two frame elements limiting one receiving pocket, where the frame elements are liquid-tightly joined to a stack-like composite along its longitudinal limiting ribs. The membrane-like surface area is formed in a rectangular or quadratic manner. The frame elements are produced as integral components in the way of injection molding process. The joining composite is implemented as adhesive composite or material closure composite between the two frame elements or between the covering plate and one frame element by thermal energy input. The groove-shaped recess openly flows inside the both edge webs per frame element in longitudinal extension of the both edge webs at front side and single-side. The groove-shaped recess of the two edge webs brought in joining composite supplement the two frame elements to the open-sided hollow channel at the front side and the single-side. A supplying unit and a discharging unit are provided for the tempering medium, so that the supplying unit with a hollow channel of the two liquid-tight coupled frame elements and the discharging unit with the other hollow channel of the two liquid-tight coupled frame elements are connected in a liquid-tight manner. The frame element limiting the two of the receiving pockets and joined to a stack-shaped composite provides hollow channels that are directly arranged one upon the other in two rows at the front side and single-side. A distributor unit supplying the tempering medium at the front side with one row of hollow channels that are directly arranged one upon the other in the stack composite and a distributor unit discharging the tempering medium at the front side with other row of hollow channels that are directly arranged one upon the other in the stack composite are connected in a liquid-tight manner. The membrane-like surface area contains phase changing material storing heat. The filling materials increasing the thermal conductivity are contained in the membrane-like surface area. The upper membrane surface has a structured surface in an area-wise manner. The frame elements are identically formed.