Capacity analysis of cycling-used Lithium iron phosphate battery
Date Issued
2015
Date
2015
Author(s)
Lin, Zih-Yeh
Abstract
Human economic activities have been deeply impacted by oil crisis and global warming. Under such circumstances, industries related to Lithium iron phosphate (LiFePO4) battery have prospered greatly recently. LiFePO4 batteries have properties such as higher power, higher capacity, longer life-time and safer than other batteries. They are also widely used in electric buses, electric cars, hybrid electric cars, electric bicycles and energy storage devices. However, battery performance decreases with increasing cycle of usage. In order to investigate the relationship between cycle of usage and aging of battery, this thesis entrusts Phoenix Silicon International Corporation to discharge and charge the batteries cyclically by using battery automation test systems, and have the data saved simultaneously. Since the battery capacity curve varies with different conditions of battery, this thesis will adopt different kinds of curve fitting according to the conditions of the battery. We expect to accurately predict the battery capacity with the parameterized results, and also analyze the difference between experimental curve and fitted curve. In conclusion, this thesis will show the relationship between battery capacity and cycle of usage.
Subjects
Lithium iron phosphate battery
cycling-charge and cycling-discharge
battery capacity analysis
curve fitting
Type
thesis
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