NOVELTY - The battery module comprises a battery module housing (2) having parts made of plastic and prismatic battery cells (5), which have a cell housing having four side walls. Two parallel side walls are larger than the two other side walls. The battery module housing comprises a cooling system having a channel structure and a liquid coolant. The channel structure has a fluid connection to a coolant inlet (11) and a coolant outlet (12) of the battery module housing. Between two adjacent battery cells, a partition made of plastic is arranged parallel to the larger side walls of the battery cell.    USE - The battery module is useful: in a vehicle; for an energy storage and feeding into an agent and/or low-voltage network, for distributed energy storage in combination with systems for the production of renewable energy or for stabilization of isolated networks; and as an uninterruptible power supply or standby power (all claimed).    ADVANTAGE - The optimize rechargeable battery module: exhibits compact structure, excellent electrical performance such as energy density and mechanical stability; and can be simply, safely and economically manufactured with less consumption of material.    DETAILED DESCRIPTION - The battery module comprises a battery module housing (2) having parts made of plastic and prismatic battery cells (5), which have a cell housing having four side walls. Two parallel side walls are larger than the two other side walls. The battery module housing comprises a cooling system having a channel structure and a liquid coolant. The channel structure has a fluid connection to a coolant inlet (11) and a coolant outlet (12) of the battery module housing. Between two adjacent battery cells, a partition made of plastic is arranged parallel to the larger side walls of the battery cell. A channel of the channel structure extends partially in the partition, and is formed by a cavity of the partition. The cavity opens toward an adjacent side wall of the battery cell. Between the side wall of the battery cell and the partition, a material of a plastic separating layer is different from the material of the partition. A thickness of separating layer is less than the thickness of the partition. The separating layer is arranged in such a way that the channel of the cooling system formed by the cavity is closed by the plastic separating layer. The partition comprises a partition side wall that is a part of the side wall of the battery module housing, and elements for holding the adjacent battery cell, where the holding elements are a part of a partition side wall, a partition bottom and/or an upper side of the partition. The plastic parts of the battery module: include a glass fiber reinforced polyamide; and are thermoplastic. A thickness of the partition is 3 mm. The cavity of the channel structure is formed in the partition in a meander-shaped manner, and the meander extends from a lower portion of the partition into an upper portion of the partition. The meander of the channel in the flow direction of the cooling liquid has narrowing meanders, where the meanders are narrowed toward the upper portion of the partition. The cavity of the channel structure extends over the entire thickness of the partition, and is opened toward the two adjacent side walls of the battery cell. The plastic separating layer has a thickness of less than 0.1 mm. The battery cells and the partition are disposed by a clamping device made of metal. The clamping device includes a metal tension band, which is laser-welded and comprises a self-locking, quick release fastener. The coolant inlet and/or the coolant outlet comprises a quick coupling for simple tools operably connection to an external cooling system. The battery module housing further comprises: an upper cover plate that is arranged above the battery cell transverse to the side walls of the battery module housing and comprises a filling opening for an electrolyte filling port for charging the battery cell with the electrolyte, where the cover plate on its upper side comprises a trough-like depression adjacent to the filling opening; and two end walls that are arranged parallel to the larger side walls of the battery cell. The partition at its short lateral sides comprises the respective partition side wall that partially protrudes the small side walls of the cell housing and forms a battery module housing sidewall with other partition side walls. The partition further comprises a partition bottom that partially protrudes above the battery cell and forms a bottom of the battery module housings together with the other partition bottom. The end walls comprise the channel open towards its inner side. One of the end walls is a rear wall, and other end wall is a front wall. The coolant inlet and/or the coolant outlet is arranged on the front wall of the battery module housing. The end walls at their outer sides have rib-like reinforcements, and transverse and longitudinal struts. The end wall further comprises a terminal wall and an outer wall. The terminal wall at its inner side comprises the channel. An outside of the terminal wall is substantially planar. The terminal wall comprises a positioning element to fix a relative position opposite to the outer wall and/or the partition. The outer wall at its outer side comprises elongate recesses.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a battery module.    Battery module housing (2)    Battery cells (5)    Coolant inlet (11)    Coolant outlet (12)    Cover plate. (48)