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Study on Evaluation Method for Battery Degradation in Plug-In Hybrid Electric Vehicles
Published October 12, 2011 by Society of Automotive Engineers of Japan in Japan
Plug-in hybrid electric vehicles (PHEV) show much higher fuel economy values than those of hybrid electric vehicles (HEV). This advantage strongly depends on the performance of batteries in PHEVs. Battery performance declines over time. Nevertheless, there are no concrete methods to evaluate battery degradation. Battery degradation depends on battery usage and secular change. Therefore, the load conditions of battery tests need to reflect actual usage conditions of PHEVs. In this study, the load condition in a battery degradation test has been investigated. The influences of electrical and thermal loading in the capacity reduction of a test battery were compared.