NOVELTY - A lithium ion (Li-ion) battery module (13) comprises container (60) comprising partitions that define compartments within the container, where each compartment is configured to receive and hold a prismatic Li-ion electrochemical cell element, and cover (64) disposed over the container to close the compartments, where the container comprises polymer blend comprising base polymer and additives blended into base polymer, where base polymer is electrically nonconductive where the additives are configured to increase thermal conductivity of container.    USE - As lithium ion (Li-ion) battery module (claimed), used in vehicle.    ADVANTAGE - The lithium ion (Li-ion) battery module has improved thermal management and permeability management of battery systems with polymer based housings and/or battery modules (e.g. containers), in order to produce the battery modules at reduced costs and with greater efficiency.    DETAILED DESCRIPTION - A lithium ion (Li-ion) battery module (13) comprises container (60) comprising partitions that define compartments within the container, where each compartment is configured to receive and hold a prismatic Li-ion electrochemical cell element, and a cover (64) disposed over the container to close the compartments, where the container comprises polymer blend comprising a base polymer and additives blended into the base polymer, where the base polymer is electrically nonconductive where the additives are configured to increase thermal conductivity of container to promote transfer of heat generated from the electrochemical cell elements through container. INDEPENDENT CLAIMS are included for the following:    (1) lithium ion (Li-ion) battery cell, comprising a housing configured to receive and hold a Li-ion electrochemical cell element, where the housing comprises a base polymer and additives blended into the base polymer, where the base polymer is electrically nonconductive where the additives are configured to increase a thermal conductivity of the housing to promote transfer of heat generated from the electrochemical cell element through the housing; and    (2) manufacturing a lithium ion (Li-ion) battery cell involving blending additives into a base polymer to generate a polymer blend, where the base polymer is electrically nonconductive where the additives are configured to increase a thermal conductivity of the polymer blend as compared to the base polymer; and forming the polymer blend into a housing configured to receive and hold a Li-ion electrochemical cell element.    DESCRIPTION OF DRAWING(S) - The figure shows partial exploded perspective view of battery module.    Lithium ion battery module (13)    Cell element (45)    Electrolyte fill holes (46)    Container (60)    Multiple partitions (62)    Cover (64)    Terminals (66, 68)    Electrical connectors (74)