Abstract
Lithium-ion technology is the battery technology of the future for the electric drive systems of hybrid vehicles. Compared with the nickel-metal hydride batteries used in hybrid vehicles today, lithium-ion batteries have the advantages of greater storage density, dynamic range, and service life. One drawback is their greater thermal sensitivity, which requires a special focus on cooling. Three cooling concepts are discussed in this article of Behr: cooling with refrigerant, a secondary coolant circuit, and cold air. A real air-cooling system is analyzed and compared with a refrigerantbased cooling system. The simulation calculations demonstrate the performance capability of the refrigerant cooling system.
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