Laboratory Characterization of Automotive NiMH-battery celIs
Salonen, Henri (2019)
Salonen, Henri
2019
Sähkötekniikka
Informaatioteknologian ja viestinnän tiedekunta - Faculty of Information Technology and Communication Sciences
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Hyväksymispäivämäärä
2019-05-15
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201905311800
https://urn.fi/URN:NBN:fi:tty-201905311800
Tiivistelmä
This thesis was made to reflect on the measurements made on 10 battery modules of a total number of 28 modules from a Toyota Auris hybrid electric vehicle’s battery system. The objective of the measurements was to ascertain the approximate values of capacity, efficiency and its dependency on the discharge current for each of the battery modules, and averages of the values of all of the battery modules.
The measurements were made as three separate charge-discharge-cycles for each of the 10 modules while measuring the voltage at the terminals of the battery module and the current to and from the battery module. The charging was done with a charging current of 2 A and the discharges with a constant discharge current of 5.0 A, 7.5 A and 10.0 A, respectively. The charging and discharging energy of each of the batteries was then calculated using the trapezoidal rule from the resultant voltage-current curves. The efficiency of each of the batteries was then calculated from comparing the discharging energy to the charging energy of each of the pairs.
The average capacity was calculated as approximately 29.7 W h, and the average efficiency was calculated as approximately 82.5%. The approximate total capacity of the battery system with 28 total modules was calculated as approximately 830 W h which is approximately 63.8% of the reference capacity. The dependency of efficiency from the discharge current was approximated with a fitted curve following the function η = (−0.0024 ± 0.0106)Id + 0.83 ± 0.0828
The measurements were made as three separate charge-discharge-cycles for each of the 10 modules while measuring the voltage at the terminals of the battery module and the current to and from the battery module. The charging was done with a charging current of 2 A and the discharges with a constant discharge current of 5.0 A, 7.5 A and 10.0 A, respectively. The charging and discharging energy of each of the batteries was then calculated using the trapezoidal rule from the resultant voltage-current curves. The efficiency of each of the batteries was then calculated from comparing the discharging energy to the charging energy of each of the pairs.
The average capacity was calculated as approximately 29.7 W h, and the average efficiency was calculated as approximately 82.5%. The approximate total capacity of the battery system with 28 total modules was calculated as approximately 830 W h which is approximately 63.8% of the reference capacity. The dependency of efficiency from the discharge current was approximated with a fitted curve following the function η = (−0.0024 ± 0.0106)Id + 0.83 ± 0.0828
Kokoelmat
- Kandidaatintutkielmat [7055]