NOVELTY - A battery module comprises a housing having a non-conductive oil disposed in it; a battery cell disposed in the housing; and a cooling manifold disposed in the housing that contacts the non-conductive oil, the cooling manifold configured to receive a fluid through it and to conduct heat energy from the non-conductive oil into the fluid to cool the battery cell.    USE - The battery module is used in battery system for generating electrical power.    ADVANTAGE - The present invention provides an improved battery system having a battery module and a method for cooling the battery module while maintaining the battery cells within a desired temperature range in an air-cooled battery pack.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are:    (1) a battery system comprising: a battery module having a housing, a battery cell, and a cooling manifold, the housing having a non-conductive oil disposed in it that contacts the cooling manifold, the battery cell and the cooling manifold being disposed in the housing, the cooling manifold configured to receive a refrigerant through it and to conduct heat energy from the non-conductive oil into the refrigerant to cool the battery module; a condenser fluidly coupled to the battery module, the condenser configured to receive the refrigerant from the battery module and to extract heat energy from the refrigerant; and a compressor fluidly coupled to the condenser and configured to receive the refrigerant from the condenser, the compressor further fluidly coupled to the battery module, the compressor configured to pump the refrigerant from the condenser into the battery module;    (2) a battery system comprising: a battery module having a housing, a battery cell, and a cooling manifold, the housing having a non-conductive oil disposed in it that contacts the cooling manifold, the battery cell and the cooling manifold being disposed in the housing, the cooling manifold configured to receive a coolant through it and to conduct heat energy from the non-conductive oil into the coolant to cool the battery module; a heat exchanger fluidly coupled to the battery module, the heat exchanger configured to receive the coolant from the battery module in it and to extract heat energy from the coolant flowing through it; a cold plate fluidly coupled to the heat exchanger, the cold plate configured to extract heat energy from the coolant flowing through it; a reservoir fluidly coupled between the cold plate and a pump, the reservoir configured to receive the coolant from the cold plate and to route the coolant to the pump; and the pump further fluidly coupled to the battery module, the pump configured to pump the coolant from the reservoir into the battery module; and    (3) a method for cooling a battery module, the battery module having a housing, a battery cell, and a cooling math- fold, the method comprises conducting heat energy from the battery cell into a non- conductive oil disposed in the housing; and receiving fluid in the cooling manifold and conducting heat energy from the non-conductive oil into the fluid to cool the battery cell in the housing.