NOVELTY - A battery module comprises a battery cell having a first side and a second side; a first graphite sheet disposed on the first side of the battery cell that conducts heat energy from the battery cell into the first graphite sheet to cool the battery cell; and a first cooling manifold coupled to the first graphite sheet that conducts heat energy from the first graphite sheet into the first cooling manifold, the first cooling manifold further configured to receive a fluid that flows through it to conduct heat energy from the first cooling manifold into the fluid.    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 battery cell, a first graphite sheet, and a first cooling manifold, the battery cell having a first side and a second side, the first graphite sheet disposed on the first side of the battery cell and conducts heat energy from the battery cell into the first graphite sheet to cool the battery cell, the first cooling manifold coupled to the first graphite sheet and conducts heat energy from the first graphite sheet into the first cooling manifold, the first cooling manifold further configured to receive a refrigerant that flows through it to conduct heat energy from the first cooling manifold into the refrigerant; 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, the condenser further fluidly coupled to a compressor and configured to route the refrigerant to the compressor; and the compressor further fluidly coupled to the first cooling manifold of the battery module, the compressor configured to pump the refrigerant into the first cooling manifold;    (2) (2) a battery system comprising: a battery module having a battery cell, a first graphite sheet, and a first cooling manifold, the battery cell having a first side and a second side, the first graphite sheet disposed on the first side of the battery cell and conducts heat energy from the battery cell into the first graphite sheet to cool the battery cell, the first cooling manifold coupled to the first graphite sheet and conducts heat energy from the first graphite sheet into the first cooling manifold, the first cooling manifold further configured to receive a coolant through it to conduct heat energy from the first cooling manifold into the coolant; 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 first cooling manifold of the battery module, the pump configured to pump the coolant from the reservoir into the first cooling manifold; and    (3) a method for cooling a battery module, the battery module having a battery cell, a first graphite sheet, and a first cooling manifold, the method comprises conducting heat energy from the battery cell into the first graphite sheet disposed on a first side of the battery cell to cool the battery cell; conducting heat energy from the first graphite sheet into the first cooling manifold coupled to the first graphite sheet; and receiving a fluid in the first cooling manifold and conducting heat energy from the first cooling manifold into the fluid in the first cooling manifold.