•  With the high voltage battery, the charging and discharging performance is lowered by decreasing the lithium ion's activation in extremely cold environments. The battery heater system assures the charging and discharging performance by heating the battery module.

•  The BECM turns on the battery heater contactor based on the information from each sensor, such as the condition and temperature of the high voltage battery, and the electrical power from the high voltage battery is supplied to the battery heater.

•  The cooling plate is warmed from heat generated by the battery heater.

•  The battery heater is integrated with the cooling plate.

•  The battery heater contactor is installed in junction box No.1.

•  If the high voltage battery temperature decreases below the specified value, the BECM turns on the battery heater contactor, and electrical power from the high voltage battery is supplied to the electric heating wires of the heaters.

•  When the battery heater is activated while the high voltage battery is charging, electrical power from the charging equipment is supplied to the battery heater.

•  The battery heater circuit has a thermal fuse. If the battery heater contactor cannot be turned off due to a vehicle malfunction, the temperature fuse will blow and the circuit will be cut off to prevent the high voltage battery from overheating.

•  When the battery heater stop conditions are met, such as when the high voltage battery temperature rises to a certain temperature, the BECM turns off the battery heater contactor and stops supplying power to the battery heaters.

•  The battery heaters are operated when the BECM receives an operation request signal from the PCM, even if the main power is switched OFF. For details on the PCM control, refer to [BATTERY HEATER CONTROL]. (See BATTERY HEATER CONTROL.)