Determining State-of-Health Using Battery Life Cycle Testing and Time-Temperature Equivalency in Lithium-Ion Batteries
Abstract
This dissertation has investigated capacity and state-of-health (SoH) reduction in lithium-ion batteries using only time, temperature, and the kilo-Watt-hour value reported from the battery management system. Battery life cycling data obtained from a U.S. battery manufacturer was used for this dissertation, where data was available for a battery cycled at ambient temperature and at elevated temperature. The data used was limited to data points available only from the battery management system. The use of time and temperature on these data was explored to find a time-temperature equivalency. Additionally, testing equipment was developed and the implementation of CAN data acquisition was pursued to replicate life cycle testing. The development and usage of these technologies was presented. This dissertation has proven that time-temperature equivalency is possible in batteries. This dissertation has also proven that capacity and SoH reductions are found using only time, temperature, and the kilo-Watt-hour value from the battery management system.
Degree
Ph.D.
Advisors
Dietz, Purdue University.
Subject Area
Energy
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