Battery Heating System for Electric Vehicles

Paper #:
  • 2015-01-0248

Published:
  • 2015-04-14
DOI:
  • 10.4271/2015-01-0248
Citation:
Baba, H., Kawasaki, K., and Kawachi, H., "Battery Heating System for Electric Vehicles," SAE Technical Paper 2015-01-0248, 2015, doi:10.4271/2015-01-0248.
Pages:
7
Abstract:
We have developed Li-ion battery heating system which is direct resistance heating for hybrid electric vehicles (HEV), plug-in hybrid vehicles (PHEV) and electric vehicles (EV) by use of an inverter and a motor. One relay is added between a positive terminal of Li-ion battery and one-phase (e.g. U-phase) of a three-phase motor. When additional relay is turned on, the motor coils, IGBTs (Insulated-gate bipolar transistor) and diodes in the inverter and a smoothing capacitor for the inverter constitute buck-boost DC to DC converter. IGBTs are controlled to repeat charging and discharging between the battery and the smoothing capacitor. We made a system prototype and examined battery heating capability. And also we optimized charging and discharging frequency from impedance and current to improve heat generation. This method can increase battery temperature from −20 degrees C to 0 degrees C in 5 minutes and can extend EV driving range. Additionally the system can be installed into all HEV, PHEV and EV.
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